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Commit | Line | Data |
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0ad19a3f | 1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2007, 2008 | |
5 | * | |
6 | * Authors: | |
9afe19d6 | 7 | * Daniel Lezcano <daniel.lezcano at free.fr> |
0ad19a3f | 8 | * |
9 | * This library is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * This library is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with this library; if not, write to the Free Software | |
250b1eec | 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
0ad19a3f | 22 | */ |
1d52bdf7 CB |
23 | |
24 | #define _GNU_SOURCE | |
d06245b8 NC |
25 | #include "config.h" |
26 | ||
8f3e280e CB |
27 | #include <dirent.h> |
28 | #include <errno.h> | |
29 | #include <fcntl.h> | |
30 | #include <grp.h> | |
31 | #include <inttypes.h> | |
32 | #include <libgen.h> | |
33 | #include <pwd.h> | |
34 | #include <stdarg.h> | |
0ad19a3f | 35 | #include <stdio.h> |
0ad19a3f | 36 | #include <stdlib.h> |
0ad19a3f | 37 | #include <string.h> |
8f3e280e | 38 | #include <time.h> |
0ad19a3f | 39 | #include <unistd.h> |
8f3e280e CB |
40 | #include <arpa/inet.h> |
41 | #include <linux/loop.h> | |
8f3e280e CB |
42 | #include <net/if.h> |
43 | #include <netinet/in.h> | |
44 | #include <sys/mman.h> | |
45 | #include <sys/mount.h> | |
46 | #include <sys/param.h> | |
47 | #include <sys/prctl.h> | |
48 | #include <sys/stat.h> | |
49 | #include <sys/socket.h> | |
ce831b3b | 50 | #include <sys/sysmacros.h> |
2d76d1d7 | 51 | #include <sys/syscall.h> |
97e9cfa0 | 52 | #include <sys/types.h> |
8f3e280e CB |
53 | #include <sys/utsname.h> |
54 | #include <sys/wait.h> | |
1d52bdf7 | 55 | |
af6824fc ST |
56 | /* makedev() */ |
57 | #ifdef MAJOR_IN_MKDEV | |
58 | # include <sys/mkdev.h> | |
59 | #endif | |
af6824fc | 60 | |
614305f3 | 61 | #ifdef HAVE_STATVFS |
2938f7c8 | 62 | #include <sys/statvfs.h> |
614305f3 | 63 | #endif |
e827ff7e SG |
64 | |
65 | #if HAVE_PTY_H | |
b0a33c1e | 66 | #include <pty.h> |
e827ff7e SG |
67 | #else |
68 | #include <../include/openpty.h> | |
69 | #endif | |
0ad19a3f | 70 | |
5ef5c9a3 CB |
71 | #ifdef HAVE_LINUX_MEMFD_H |
72 | #include <linux/memfd.h> | |
73 | #endif | |
74 | ||
e8bd4e43 | 75 | #include "af_unix.h" |
8f3e280e CB |
76 | #include "bdev.h" |
77 | #include "caps.h" /* for lxc_caps_last_cap() */ | |
78 | #include "cgroup.h" | |
1b09f2c0 | 79 | #include "conf.h" |
8f3e280e | 80 | #include "error.h" |
1b09f2c0 | 81 | #include "log.h" |
d8e48992 | 82 | #include "lxcaufs.h" |
025ed0f3 | 83 | #include "lxclock.h" |
8f3e280e CB |
84 | #include "lxcoverlay.h" |
85 | #include "lxcseccomp.h" | |
4355ab5f | 86 | #include "namespace.h" |
8f3e280e CB |
87 | #include "network.h" |
88 | #include "parse.h" | |
89 | #include "utils.h" | |
fe4de9a6 | 90 | #include "lsm/lsm.h" |
d0a36f2c | 91 | |
e37dda71 | 92 | #if HAVE_LIBCAP |
495d2046 SG |
93 | #include <sys/capability.h> |
94 | #endif | |
95 | ||
6ff05e18 SG |
96 | #if HAVE_SYS_PERSONALITY_H |
97 | #include <sys/personality.h> | |
98 | #endif | |
99 | ||
edaf8b1b SG |
100 | #if IS_BIONIC |
101 | #include <../include/lxcmntent.h> | |
102 | #else | |
103 | #include <mntent.h> | |
104 | #endif | |
105 | ||
36eb9bde | 106 | lxc_log_define(lxc_conf, lxc); |
e5bda9ee | 107 | |
e37dda71 | 108 | #if HAVE_LIBCAP |
b09094da MN |
109 | #ifndef CAP_SETFCAP |
110 | #define CAP_SETFCAP 31 | |
111 | #endif | |
112 | ||
113 | #ifndef CAP_MAC_OVERRIDE | |
114 | #define CAP_MAC_OVERRIDE 32 | |
115 | #endif | |
116 | ||
117 | #ifndef CAP_MAC_ADMIN | |
118 | #define CAP_MAC_ADMIN 33 | |
119 | #endif | |
495d2046 | 120 | #endif |
b09094da MN |
121 | |
122 | #ifndef PR_CAPBSET_DROP | |
123 | #define PR_CAPBSET_DROP 24 | |
124 | #endif | |
125 | ||
9818cae4 SG |
126 | #ifndef LO_FLAGS_AUTOCLEAR |
127 | #define LO_FLAGS_AUTOCLEAR 4 | |
128 | #endif | |
129 | ||
0769b82a CS |
130 | /* needed for cgroup automount checks, regardless of whether we |
131 | * have included linux/capability.h or not */ | |
132 | #ifndef CAP_SYS_ADMIN | |
133 | #define CAP_SYS_ADMIN 21 | |
134 | #endif | |
135 | ||
2d76d1d7 SG |
136 | /* Define pivot_root() if missing from the C library */ |
137 | #ifndef HAVE_PIVOT_ROOT | |
138 | static int pivot_root(const char * new_root, const char * put_old) | |
139 | { | |
140 | #ifdef __NR_pivot_root | |
8f3e280e | 141 | return syscall(__NR_pivot_root, new_root, put_old); |
2d76d1d7 | 142 | #else |
8f3e280e CB |
143 | errno = ENOSYS; |
144 | return -1; | |
2d76d1d7 SG |
145 | #endif |
146 | } | |
147 | #else | |
148 | extern int pivot_root(const char * new_root, const char * put_old); | |
149 | #endif | |
150 | ||
151 | /* Define sethostname() if missing from the C library */ | |
152 | #ifndef HAVE_SETHOSTNAME | |
153 | static int sethostname(const char * name, size_t len) | |
154 | { | |
155 | #ifdef __NR_sethostname | |
8f3e280e | 156 | return syscall(__NR_sethostname, name, len); |
2d76d1d7 | 157 | #else |
8f3e280e CB |
158 | errno = ENOSYS; |
159 | return -1; | |
2d76d1d7 SG |
160 | #endif |
161 | } | |
162 | #endif | |
163 | ||
72f919c4 SG |
164 | /* Define __S_ISTYPE if missing from the C library */ |
165 | #ifndef __S_ISTYPE | |
166 | #define __S_ISTYPE(mode, mask) (((mode) & S_IFMT) == (mask)) | |
167 | #endif | |
168 | ||
ecec0126 SG |
169 | #ifndef MS_PRIVATE |
170 | #define MS_PRIVATE (1<<18) | |
171 | #endif | |
172 | ||
5ef5c9a3 CB |
173 | /* memfd_create() */ |
174 | #ifndef MFD_CLOEXEC | |
175 | #define MFD_CLOEXEC 0x0001U | |
176 | #endif | |
177 | ||
178 | #ifndef MFD_ALLOW_SEALING | |
179 | #define MFD_ALLOW_SEALING 0x0002U | |
180 | #endif | |
181 | ||
182 | #ifndef HAVE_MEMFD_CREATE | |
183 | static int memfd_create(const char *name, unsigned int flags) { | |
184 | #ifndef __NR_memfd_create | |
185 | #if defined __i386__ | |
186 | #define __NR_memfd_create 356 | |
187 | #elif defined __x86_64__ | |
188 | #define __NR_memfd_create 319 | |
189 | #elif defined __arm__ | |
190 | #define __NR_memfd_create 385 | |
191 | #elif defined __aarch64__ | |
192 | #define __NR_memfd_create 279 | |
193 | #elif defined __s390__ | |
194 | #define __NR_memfd_create 350 | |
195 | #elif defined __powerpc__ | |
196 | #define __NR_memfd_create 360 | |
197 | #elif defined __sparc__ | |
198 | #define __NR_memfd_create 348 | |
199 | #elif defined __blackfin__ | |
200 | #define __NR_memfd_create 390 | |
201 | #elif defined __ia64__ | |
202 | #define __NR_memfd_create 1340 | |
203 | #elif defined _MIPS_SIM | |
204 | #if _MIPS_SIM == _MIPS_SIM_ABI32 | |
205 | #define __NR_memfd_create 4354 | |
206 | #endif | |
207 | #if _MIPS_SIM == _MIPS_SIM_NABI32 | |
208 | #define __NR_memfd_create 6318 | |
209 | #endif | |
210 | #if _MIPS_SIM == _MIPS_SIM_ABI64 | |
211 | #define __NR_memfd_create 5314 | |
212 | #endif | |
213 | #endif | |
214 | #endif | |
215 | #ifdef __NR_memfd_create | |
216 | return syscall(__NR_memfd_create, name, flags); | |
217 | #else | |
218 | errno = ENOSYS; | |
219 | return -1; | |
220 | #endif | |
221 | } | |
222 | #else | |
223 | extern int memfd_create(const char *name, unsigned int flags); | |
224 | #endif | |
225 | ||
72d0e1cb | 226 | char *lxchook_names[NUM_LXC_HOOKS] = { |
52492063 | 227 | "pre-start", "pre-mount", "mount", "autodev", "start", "stop", "post-stop", "clone", "destroy" }; |
72d0e1cb | 228 | |
a589434e | 229 | typedef int (*instantiate_cb)(struct lxc_handler *, struct lxc_netdev *); |
0ad19a3f | 230 | |
998ac676 RT |
231 | struct mount_opt { |
232 | char *name; | |
233 | int clear; | |
234 | int flag; | |
235 | }; | |
236 | ||
81810dd1 DL |
237 | struct caps_opt { |
238 | char *name; | |
239 | int value; | |
240 | }; | |
241 | ||
858377e4 SH |
242 | /* |
243 | * The lxc_conf of the container currently being worked on in an | |
244 | * API call | |
245 | * This is used in the error calls | |
246 | */ | |
247 | #ifdef HAVE_TLS | |
248 | __thread struct lxc_conf *current_config; | |
249 | #else | |
250 | struct lxc_conf *current_config; | |
251 | #endif | |
252 | ||
0769b82a CS |
253 | /* Declare this here, since we don't want to reshuffle the whole file. */ |
254 | static int in_caplist(int cap, struct lxc_list *caps); | |
255 | ||
a589434e JN |
256 | static int instantiate_veth(struct lxc_handler *, struct lxc_netdev *); |
257 | static int instantiate_macvlan(struct lxc_handler *, struct lxc_netdev *); | |
258 | static int instantiate_vlan(struct lxc_handler *, struct lxc_netdev *); | |
259 | static int instantiate_phys(struct lxc_handler *, struct lxc_netdev *); | |
260 | static int instantiate_empty(struct lxc_handler *, struct lxc_netdev *); | |
261 | static int instantiate_none(struct lxc_handler *, struct lxc_netdev *); | |
262 | ||
263 | static instantiate_cb netdev_conf[LXC_NET_MAXCONFTYPE + 1] = { | |
264 | [LXC_NET_VETH] = instantiate_veth, | |
265 | [LXC_NET_MACVLAN] = instantiate_macvlan, | |
266 | [LXC_NET_VLAN] = instantiate_vlan, | |
267 | [LXC_NET_PHYS] = instantiate_phys, | |
268 | [LXC_NET_EMPTY] = instantiate_empty, | |
269 | [LXC_NET_NONE] = instantiate_none, | |
0ad19a3f | 270 | }; |
271 | ||
74a2b586 JK |
272 | static int shutdown_veth(struct lxc_handler *, struct lxc_netdev *); |
273 | static int shutdown_macvlan(struct lxc_handler *, struct lxc_netdev *); | |
274 | static int shutdown_vlan(struct lxc_handler *, struct lxc_netdev *); | |
275 | static int shutdown_phys(struct lxc_handler *, struct lxc_netdev *); | |
276 | static int shutdown_empty(struct lxc_handler *, struct lxc_netdev *); | |
26b797f3 | 277 | static int shutdown_none(struct lxc_handler *, struct lxc_netdev *); |
74a2b586 | 278 | |
a589434e | 279 | static instantiate_cb netdev_deconf[LXC_NET_MAXCONFTYPE + 1] = { |
74a2b586 JK |
280 | [LXC_NET_VETH] = shutdown_veth, |
281 | [LXC_NET_MACVLAN] = shutdown_macvlan, | |
282 | [LXC_NET_VLAN] = shutdown_vlan, | |
283 | [LXC_NET_PHYS] = shutdown_phys, | |
284 | [LXC_NET_EMPTY] = shutdown_empty, | |
26b797f3 | 285 | [LXC_NET_NONE] = shutdown_none, |
74a2b586 JK |
286 | }; |
287 | ||
998ac676 | 288 | static struct mount_opt mount_opt[] = { |
88d413d5 SW |
289 | { "defaults", 0, 0 }, |
290 | { "ro", 0, MS_RDONLY }, | |
291 | { "rw", 1, MS_RDONLY }, | |
292 | { "suid", 1, MS_NOSUID }, | |
293 | { "nosuid", 0, MS_NOSUID }, | |
294 | { "dev", 1, MS_NODEV }, | |
295 | { "nodev", 0, MS_NODEV }, | |
296 | { "exec", 1, MS_NOEXEC }, | |
297 | { "noexec", 0, MS_NOEXEC }, | |
298 | { "sync", 0, MS_SYNCHRONOUS }, | |
299 | { "async", 1, MS_SYNCHRONOUS }, | |
300 | { "dirsync", 0, MS_DIRSYNC }, | |
301 | { "remount", 0, MS_REMOUNT }, | |
302 | { "mand", 0, MS_MANDLOCK }, | |
303 | { "nomand", 1, MS_MANDLOCK }, | |
304 | { "atime", 1, MS_NOATIME }, | |
305 | { "noatime", 0, MS_NOATIME }, | |
306 | { "diratime", 1, MS_NODIRATIME }, | |
307 | { "nodiratime", 0, MS_NODIRATIME }, | |
308 | { "bind", 0, MS_BIND }, | |
309 | { "rbind", 0, MS_BIND|MS_REC }, | |
310 | { "relatime", 0, MS_RELATIME }, | |
311 | { "norelatime", 1, MS_RELATIME }, | |
312 | { "strictatime", 0, MS_STRICTATIME }, | |
313 | { "nostrictatime", 1, MS_STRICTATIME }, | |
314 | { NULL, 0, 0 }, | |
998ac676 RT |
315 | }; |
316 | ||
e37dda71 | 317 | #if HAVE_LIBCAP |
81810dd1 | 318 | static struct caps_opt caps_opt[] = { |
a6afdde9 | 319 | { "chown", CAP_CHOWN }, |
1e11be34 DL |
320 | { "dac_override", CAP_DAC_OVERRIDE }, |
321 | { "dac_read_search", CAP_DAC_READ_SEARCH }, | |
322 | { "fowner", CAP_FOWNER }, | |
323 | { "fsetid", CAP_FSETID }, | |
81810dd1 DL |
324 | { "kill", CAP_KILL }, |
325 | { "setgid", CAP_SETGID }, | |
326 | { "setuid", CAP_SETUID }, | |
327 | { "setpcap", CAP_SETPCAP }, | |
328 | { "linux_immutable", CAP_LINUX_IMMUTABLE }, | |
329 | { "net_bind_service", CAP_NET_BIND_SERVICE }, | |
330 | { "net_broadcast", CAP_NET_BROADCAST }, | |
331 | { "net_admin", CAP_NET_ADMIN }, | |
332 | { "net_raw", CAP_NET_RAW }, | |
333 | { "ipc_lock", CAP_IPC_LOCK }, | |
334 | { "ipc_owner", CAP_IPC_OWNER }, | |
335 | { "sys_module", CAP_SYS_MODULE }, | |
336 | { "sys_rawio", CAP_SYS_RAWIO }, | |
337 | { "sys_chroot", CAP_SYS_CHROOT }, | |
338 | { "sys_ptrace", CAP_SYS_PTRACE }, | |
339 | { "sys_pacct", CAP_SYS_PACCT }, | |
340 | { "sys_admin", CAP_SYS_ADMIN }, | |
341 | { "sys_boot", CAP_SYS_BOOT }, | |
342 | { "sys_nice", CAP_SYS_NICE }, | |
343 | { "sys_resource", CAP_SYS_RESOURCE }, | |
344 | { "sys_time", CAP_SYS_TIME }, | |
345 | { "sys_tty_config", CAP_SYS_TTY_CONFIG }, | |
346 | { "mknod", CAP_MKNOD }, | |
347 | { "lease", CAP_LEASE }, | |
57b837e2 CB |
348 | #ifdef CAP_AUDIT_READ |
349 | { "audit_read", CAP_AUDIT_READ }, | |
350 | #endif | |
9527e566 | 351 | #ifdef CAP_AUDIT_WRITE |
81810dd1 | 352 | { "audit_write", CAP_AUDIT_WRITE }, |
9527e566 FW |
353 | #endif |
354 | #ifdef CAP_AUDIT_CONTROL | |
81810dd1 | 355 | { "audit_control", CAP_AUDIT_CONTROL }, |
9527e566 | 356 | #endif |
81810dd1 DL |
357 | { "setfcap", CAP_SETFCAP }, |
358 | { "mac_override", CAP_MAC_OVERRIDE }, | |
359 | { "mac_admin", CAP_MAC_ADMIN }, | |
5170c716 CS |
360 | #ifdef CAP_SYSLOG |
361 | { "syslog", CAP_SYSLOG }, | |
362 | #endif | |
363 | #ifdef CAP_WAKE_ALARM | |
364 | { "wake_alarm", CAP_WAKE_ALARM }, | |
365 | #endif | |
2b54359b CB |
366 | #ifdef CAP_BLOCK_SUSPEND |
367 | { "block_suspend", CAP_BLOCK_SUSPEND }, | |
368 | #endif | |
81810dd1 | 369 | }; |
495d2046 SG |
370 | #else |
371 | static struct caps_opt caps_opt[] = {}; | |
372 | #endif | |
81810dd1 | 373 | |
91c3830e SH |
374 | static int run_buffer(char *buffer) |
375 | { | |
ebec9176 | 376 | struct lxc_popen_FILE *f; |
91c3830e | 377 | char *output; |
8e7da691 | 378 | int ret; |
91c3830e | 379 | |
ebec9176 | 380 | f = lxc_popen(buffer); |
91c3830e | 381 | if (!f) { |
062b72c6 | 382 | SYSERROR("Failed to popen() %s.", buffer); |
91c3830e SH |
383 | return -1; |
384 | } | |
385 | ||
386 | output = malloc(LXC_LOG_BUFFER_SIZE); | |
387 | if (!output) { | |
062b72c6 | 388 | ERROR("Failed to allocate memory for %s.", buffer); |
ebec9176 | 389 | lxc_pclose(f); |
91c3830e SH |
390 | return -1; |
391 | } | |
392 | ||
062b72c6 CB |
393 | while (fgets(output, LXC_LOG_BUFFER_SIZE, f->f)) |
394 | DEBUG("Script %s with output: %s.", buffer, output); | |
91c3830e SH |
395 | |
396 | free(output); | |
397 | ||
ebec9176 | 398 | ret = lxc_pclose(f); |
8e7da691 | 399 | if (ret == -1) { |
062b72c6 | 400 | SYSERROR("Script exited with error."); |
91c3830e | 401 | return -1; |
8e7da691 | 402 | } else if (WIFEXITED(ret) && WEXITSTATUS(ret) != 0) { |
062b72c6 | 403 | ERROR("Script exited with status %d.", WEXITSTATUS(ret)); |
8e7da691 DE |
404 | return -1; |
405 | } else if (WIFSIGNALED(ret)) { | |
062b72c6 | 406 | ERROR("Script terminated by signal %d.", WTERMSIG(ret)); |
8e7da691 | 407 | return -1; |
91c3830e SH |
408 | } |
409 | ||
410 | return 0; | |
411 | } | |
412 | ||
148e91f5 | 413 | static int run_script_argv(const char *name, const char *section, |
062b72c6 CB |
414 | const char *script, const char *hook, |
415 | const char *lxcpath, char **argsin) | |
148e91f5 SH |
416 | { |
417 | int ret, i; | |
418 | char *buffer; | |
419 | size_t size = 0; | |
420 | ||
062b72c6 | 421 | INFO("Executing script \"%s\" for container \"%s\", config section \"%s\".", |
148e91f5 SH |
422 | script, name, section); |
423 | ||
062b72c6 | 424 | for (i = 0; argsin && argsin[i]; i++) |
148e91f5 SH |
425 | size += strlen(argsin[i]) + 1; |
426 | ||
427 | size += strlen(hook) + 1; | |
428 | ||
429 | size += strlen(script); | |
430 | size += strlen(name); | |
431 | size += strlen(section); | |
432 | size += 3; | |
433 | ||
434 | if (size > INT_MAX) | |
435 | return -1; | |
436 | ||
437 | buffer = alloca(size); | |
438 | if (!buffer) { | |
062b72c6 | 439 | ERROR("Failed to allocate memory."); |
148e91f5 SH |
440 | return -1; |
441 | } | |
442 | ||
062b72c6 CB |
443 | ret = |
444 | snprintf(buffer, size, "%s %s %s %s", script, name, section, hook); | |
445 | if (ret < 0 || (size_t)ret >= size) { | |
446 | ERROR("Script name too long."); | |
148e91f5 SH |
447 | return -1; |
448 | } | |
449 | ||
062b72c6 CB |
450 | for (i = 0; argsin && argsin[i]; i++) { |
451 | int len = size - ret; | |
148e91f5 SH |
452 | int rc; |
453 | rc = snprintf(buffer + ret, len, " %s", argsin[i]); | |
454 | if (rc < 0 || rc >= len) { | |
062b72c6 | 455 | ERROR("Script args too long."); |
148e91f5 SH |
456 | return -1; |
457 | } | |
458 | ret += rc; | |
459 | } | |
460 | ||
461 | return run_buffer(buffer); | |
462 | } | |
463 | ||
062b72c6 CB |
464 | static int run_script(const char *name, const char *section, const char *script, |
465 | ...) | |
e3b4c4c4 | 466 | { |
abbfd20b | 467 | int ret; |
91c3830e | 468 | char *buffer, *p; |
abbfd20b DL |
469 | size_t size = 0; |
470 | va_list ap; | |
751d9dcd | 471 | |
062b72c6 | 472 | INFO("Executing script \"%s\" for container \"%s\", config section \"%s\".", |
751d9dcd | 473 | script, name, section); |
e3b4c4c4 | 474 | |
abbfd20b DL |
475 | va_start(ap, script); |
476 | while ((p = va_arg(ap, char *))) | |
95642a10 | 477 | size += strlen(p) + 1; |
abbfd20b DL |
478 | va_end(ap); |
479 | ||
480 | size += strlen(script); | |
481 | size += strlen(name); | |
482 | size += strlen(section); | |
95642a10 | 483 | size += 3; |
abbfd20b | 484 | |
95642a10 MS |
485 | if (size > INT_MAX) |
486 | return -1; | |
487 | ||
488 | buffer = alloca(size); | |
abbfd20b | 489 | if (!buffer) { |
062b72c6 | 490 | ERROR("Failed to allocate memory."); |
751d9dcd DL |
491 | return -1; |
492 | } | |
493 | ||
9ba8130c SH |
494 | ret = snprintf(buffer, size, "%s %s %s", script, name, section); |
495 | if (ret < 0 || ret >= size) { | |
062b72c6 | 496 | ERROR("Script name too long."); |
9ba8130c SH |
497 | return -1; |
498 | } | |
751d9dcd | 499 | |
abbfd20b | 500 | va_start(ap, script); |
9ba8130c | 501 | while ((p = va_arg(ap, char *))) { |
062b72c6 | 502 | int len = size - ret; |
9ba8130c SH |
503 | int rc; |
504 | rc = snprintf(buffer + ret, len, " %s", p); | |
505 | if (rc < 0 || rc >= len) { | |
062b72c6 | 506 | ERROR("Script args too long."); |
9ba8130c SH |
507 | return -1; |
508 | } | |
509 | ret += rc; | |
510 | } | |
abbfd20b | 511 | va_end(ap); |
751d9dcd | 512 | |
91c3830e | 513 | return run_buffer(buffer); |
e3b4c4c4 ST |
514 | } |
515 | ||
a17b1e65 SG |
516 | static int mount_rootfs_dir(const char *rootfs, const char *target, |
517 | const char *options) | |
a6afdde9 | 518 | { |
a17b1e65 SG |
519 | unsigned long mntflags; |
520 | char *mntdata; | |
521 | int ret; | |
522 | ||
523 | if (parse_mntopts(options, &mntflags, &mntdata) < 0) { | |
524 | free(mntdata); | |
525 | return -1; | |
526 | } | |
527 | ||
528 | ret = mount(rootfs, target, "none", MS_BIND | MS_REC | mntflags, mntdata); | |
529 | free(mntdata); | |
530 | ||
531 | return ret; | |
a6afdde9 DL |
532 | } |
533 | ||
534 | static int setup_lodev(const char *rootfs, int fd, struct loop_info64 *loinfo) | |
535 | { | |
536 | int rfd; | |
537 | int ret = -1; | |
538 | ||
539 | rfd = open(rootfs, O_RDWR); | |
540 | if (rfd < 0) { | |
541 | SYSERROR("failed to open '%s'", rootfs); | |
78ae2fcc | 542 | return -1; |
543 | } | |
544 | ||
a6afdde9 | 545 | memset(loinfo, 0, sizeof(*loinfo)); |
78ae2fcc | 546 | |
a6afdde9 | 547 | loinfo->lo_flags = LO_FLAGS_AUTOCLEAR; |
78ae2fcc | 548 | |
a6afdde9 DL |
549 | if (ioctl(fd, LOOP_SET_FD, rfd)) { |
550 | SYSERROR("failed to LOOP_SET_FD"); | |
551 | goto out; | |
78ae2fcc | 552 | } |
553 | ||
a6afdde9 DL |
554 | if (ioctl(fd, LOOP_SET_STATUS64, loinfo)) { |
555 | SYSERROR("failed to LOOP_SET_STATUS64"); | |
78ae2fcc | 556 | goto out; |
557 | } | |
558 | ||
a6afdde9 | 559 | ret = 0; |
78ae2fcc | 560 | out: |
a6afdde9 | 561 | close(rfd); |
78ae2fcc | 562 | |
a6afdde9 | 563 | return ret; |
78ae2fcc | 564 | } |
565 | ||
a17b1e65 SG |
566 | static int mount_rootfs_file(const char *rootfs, const char *target, |
567 | const char *options) | |
78ae2fcc | 568 | { |
74f96976 | 569 | struct dirent *direntp; |
a6afdde9 | 570 | struct loop_info64 loinfo; |
9ba8130c | 571 | int ret = -1, fd = -1, rc; |
a6afdde9 DL |
572 | DIR *dir; |
573 | char path[MAXPATHLEN]; | |
78ae2fcc | 574 | |
a6afdde9 DL |
575 | dir = opendir("/dev"); |
576 | if (!dir) { | |
577 | SYSERROR("failed to open '/dev'"); | |
78ae2fcc | 578 | return -1; |
579 | } | |
580 | ||
74f96976 | 581 | while ((direntp = readdir(dir))) { |
a6afdde9 DL |
582 | |
583 | if (!direntp) | |
584 | break; | |
585 | ||
586 | if (!strcmp(direntp->d_name, ".")) | |
587 | continue; | |
588 | ||
589 | if (!strcmp(direntp->d_name, "..")) | |
590 | continue; | |
591 | ||
592 | if (strncmp(direntp->d_name, "loop", 4)) | |
593 | continue; | |
594 | ||
9ba8130c SH |
595 | rc = snprintf(path, MAXPATHLEN, "/dev/%s", direntp->d_name); |
596 | if (rc < 0 || rc >= MAXPATHLEN) | |
597 | continue; | |
598 | ||
a6afdde9 DL |
599 | fd = open(path, O_RDWR); |
600 | if (fd < 0) | |
601 | continue; | |
602 | ||
603 | if (ioctl(fd, LOOP_GET_STATUS64, &loinfo) == 0) { | |
604 | close(fd); | |
605 | continue; | |
606 | } | |
607 | ||
608 | if (errno != ENXIO) { | |
609 | WARN("unexpected error for ioctl on '%s': %m", | |
610 | direntp->d_name); | |
00b6be44 | 611 | close(fd); |
a6afdde9 DL |
612 | continue; |
613 | } | |
614 | ||
615 | DEBUG("found '%s' free lodev", path); | |
616 | ||
617 | ret = setup_lodev(rootfs, fd, &loinfo); | |
618 | if (!ret) | |
a17b1e65 | 619 | ret = mount_unknown_fs(path, target, options); |
a6afdde9 DL |
620 | close(fd); |
621 | ||
622 | break; | |
623 | } | |
624 | ||
625 | if (closedir(dir)) | |
626 | WARN("failed to close directory"); | |
627 | ||
628 | return ret; | |
78ae2fcc | 629 | } |
630 | ||
a17b1e65 SG |
631 | static int mount_rootfs_block(const char *rootfs, const char *target, |
632 | const char *options) | |
a6afdde9 | 633 | { |
a17b1e65 | 634 | return mount_unknown_fs(rootfs, target, options); |
a6afdde9 DL |
635 | } |
636 | ||
0c547523 SH |
637 | /* |
638 | * pin_rootfs | |
b7ed4bf0 CS |
639 | * if rootfs is a directory, then open ${rootfs}/lxc.hold for writing for |
640 | * the duration of the container run, to prevent the container from marking | |
641 | * the underlying fs readonly on shutdown. unlink the file immediately so | |
642 | * no name pollution is happens | |
0c547523 SH |
643 | * return -1 on error. |
644 | * return -2 if nothing needed to be pinned. | |
645 | * return an open fd (>=0) if we pinned it. | |
646 | */ | |
647 | int pin_rootfs(const char *rootfs) | |
648 | { | |
649 | char absrootfs[MAXPATHLEN]; | |
650 | char absrootfspin[MAXPATHLEN]; | |
651 | struct stat s; | |
652 | int ret, fd; | |
653 | ||
e99ee0de | 654 | if (rootfs == NULL || strlen(rootfs) == 0) |
0d03360a | 655 | return -2; |
e99ee0de | 656 | |
00ec333b | 657 | if (!realpath(rootfs, absrootfs)) |
9be53773 | 658 | return -2; |
0c547523 | 659 | |
00ec333b | 660 | if (access(absrootfs, F_OK)) |
0c547523 | 661 | return -1; |
0c547523 | 662 | |
00ec333b | 663 | if (stat(absrootfs, &s)) |
0c547523 | 664 | return -1; |
0c547523 | 665 | |
72f919c4 | 666 | if (!S_ISDIR(s.st_mode)) |
0c547523 SH |
667 | return -2; |
668 | ||
b7ed4bf0 | 669 | ret = snprintf(absrootfspin, MAXPATHLEN, "%s/lxc.hold", absrootfs); |
00ec333b | 670 | if (ret >= MAXPATHLEN) |
0c547523 | 671 | return -1; |
0c547523 SH |
672 | |
673 | fd = open(absrootfspin, O_CREAT | O_RDWR, S_IWUSR|S_IRUSR); | |
b7ed4bf0 CS |
674 | if (fd < 0) |
675 | return fd; | |
676 | (void)unlink(absrootfspin); | |
0c547523 SH |
677 | return fd; |
678 | } | |
679 | ||
e2a7e8dc SH |
680 | /* |
681 | * If we are asking to remount something, make sure that any | |
682 | * NOEXEC etc are honored. | |
683 | */ | |
684 | static unsigned long add_required_remount_flags(const char *s, const char *d, | |
685 | unsigned long flags) | |
686 | { | |
614305f3 | 687 | #ifdef HAVE_STATVFS |
e2a7e8dc SH |
688 | struct statvfs sb; |
689 | unsigned long required_flags = 0; | |
690 | ||
691 | if (!(flags & MS_REMOUNT)) | |
692 | return flags; | |
693 | ||
694 | if (!s) | |
695 | s = d; | |
696 | ||
697 | if (!s) | |
698 | return flags; | |
699 | if (statvfs(s, &sb) < 0) | |
700 | return flags; | |
701 | ||
702 | if (sb.f_flag & MS_NOSUID) | |
703 | required_flags |= MS_NOSUID; | |
704 | if (sb.f_flag & MS_NODEV) | |
705 | required_flags |= MS_NODEV; | |
706 | if (sb.f_flag & MS_RDONLY) | |
707 | required_flags |= MS_RDONLY; | |
708 | if (sb.f_flag & MS_NOEXEC) | |
709 | required_flags |= MS_NOEXEC; | |
710 | ||
711 | return flags | required_flags; | |
614305f3 SH |
712 | #else |
713 | return flags; | |
714 | #endif | |
e2a7e8dc SH |
715 | } |
716 | ||
4fb3cba5 | 717 | static int lxc_mount_auto_mounts(struct lxc_conf *conf, int flags, struct lxc_handler *handler) |
368bbc02 | 718 | { |
368bbc02 | 719 | int r; |
80e80c40 | 720 | int i; |
b06b8511 CS |
721 | static struct { |
722 | int match_mask; | |
723 | int match_flag; | |
724 | const char *source; | |
725 | const char *destination; | |
726 | const char *fstype; | |
727 | unsigned long flags; | |
728 | const char *options; | |
729 | } default_mounts[] = { | |
730 | /* Read-only bind-mounting... In older kernels, doing that required | |
731 | * to do one MS_BIND mount and then MS_REMOUNT|MS_RDONLY the same | |
732 | * one. According to mount(2) manpage, MS_BIND honors MS_RDONLY from | |
733 | * kernel 2.6.26 onwards. However, this apparently does not work on | |
734 | * kernel 3.8. Unfortunately, on that very same kernel, doing the | |
735 | * same trick as above doesn't seem to work either, there one needs | |
736 | * to ALSO specify MS_BIND for the remount, otherwise the entire | |
737 | * fs is remounted read-only or the mount fails because it's busy... | |
738 | * MS_REMOUNT|MS_BIND|MS_RDONLY seems to work for kernels as low as | |
739 | * 2.6.32... | |
368bbc02 | 740 | */ |
f24a52d5 | 741 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, |
592fd47a SH |
742 | /* proc/tty is used as a temporary placeholder for proc/sys/net which we'll move back in a few steps */ |
743 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys/net", "%r/proc/tty", NULL, MS_BIND, NULL }, | |
f24a52d5 SG |
744 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys", "%r/proc/sys", NULL, MS_BIND, NULL }, |
745 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
592fd47a | 746 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/tty", "%r/proc/sys/net", NULL, MS_MOVE, NULL }, |
f24a52d5 SG |
747 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sysrq-trigger", "%r/proc/sysrq-trigger", NULL, MS_BIND, NULL }, |
748 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sysrq-trigger", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
749 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_RW, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
750 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RW, "sysfs", "%r/sys", "sysfs", 0, NULL }, | |
751 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RO, "sysfs", "%r/sys", "sysfs", MS_RDONLY, NULL }, | |
752 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys", "sysfs", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
753 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "%r/sys", "%r/sys", NULL, MS_BIND, NULL }, | |
754 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, NULL, "%r/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
755 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys/devices/virtual/net", "sysfs", 0, NULL }, | |
756 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "%r/sys/devices/virtual/net/devices/virtual/net", "%r/sys/devices/virtual/net", NULL, MS_BIND, NULL }, | |
757 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, NULL, "%r/sys/devices/virtual/net", NULL, MS_REMOUNT|MS_BIND|MS_NOSUID|MS_NODEV|MS_NOEXEC, NULL }, | |
758 | { 0, 0, NULL, NULL, NULL, 0, NULL } | |
b06b8511 | 759 | }; |
368bbc02 | 760 | |
b06b8511 CS |
761 | for (i = 0; default_mounts[i].match_mask; i++) { |
762 | if ((flags & default_mounts[i].match_mask) == default_mounts[i].match_flag) { | |
763 | char *source = NULL; | |
764 | char *destination = NULL; | |
765 | int saved_errno; | |
e2a7e8dc | 766 | unsigned long mflags; |
b06b8511 CS |
767 | |
768 | if (default_mounts[i].source) { | |
769 | /* will act like strdup if %r is not present */ | |
8ede5f4c | 770 | source = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].source); |
b06b8511 CS |
771 | if (!source) { |
772 | SYSERROR("memory allocation error"); | |
773 | return -1; | |
774 | } | |
775 | } | |
cc4fd506 SH |
776 | if (!default_mounts[i].destination) { |
777 | ERROR("BUG: auto mounts destination %d was NULL", i); | |
b2f44b4d | 778 | free(source); |
cc4fd506 SH |
779 | return -1; |
780 | } | |
781 | /* will act like strdup if %r is not present */ | |
782 | destination = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].destination); | |
783 | if (!destination) { | |
784 | saved_errno = errno; | |
785 | SYSERROR("memory allocation error"); | |
786 | free(source); | |
787 | errno = saved_errno; | |
788 | return -1; | |
b06b8511 | 789 | } |
e2a7e8dc SH |
790 | mflags = add_required_remount_flags(source, destination, |
791 | default_mounts[i].flags); | |
592fd47a | 792 | r = safe_mount(source, destination, default_mounts[i].fstype, mflags, default_mounts[i].options, conf->rootfs.path ? conf->rootfs.mount : NULL); |
b06b8511 | 793 | saved_errno = errno; |
b88ff9a0 SG |
794 | if (r < 0 && errno == ENOENT) { |
795 | INFO("Mount source or target for %s on %s doesn't exist. Skipping.", source, destination); | |
796 | r = 0; | |
797 | } | |
798 | else if (r < 0) | |
e2a7e8dc | 799 | SYSERROR("error mounting %s on %s flags %lu", source, destination, mflags); |
f24a52d5 | 800 | |
b06b8511 CS |
801 | free(source); |
802 | free(destination); | |
803 | if (r < 0) { | |
b06b8511 CS |
804 | errno = saved_errno; |
805 | return -1; | |
806 | } | |
368bbc02 | 807 | } |
368bbc02 CS |
808 | } |
809 | ||
b06b8511 | 810 | if (flags & LXC_AUTO_CGROUP_MASK) { |
0769b82a CS |
811 | int cg_flags; |
812 | ||
813 | cg_flags = flags & LXC_AUTO_CGROUP_MASK; | |
814 | /* If the type of cgroup mount was not specified, it depends on the | |
815 | * container's capabilities as to what makes sense: if we have | |
816 | * CAP_SYS_ADMIN, the read-only part can be remounted read-write | |
817 | * anyway, so we may as well default to read-write; then the admin | |
818 | * will not be given a false sense of security. (And if they really | |
819 | * want mixed r/o r/w, then they can explicitly specify :mixed.) | |
820 | * OTOH, if the container lacks CAP_SYS_ADMIN, do only default to | |
821 | * :mixed, because then the container can't remount it read-write. */ | |
822 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC || cg_flags == LXC_AUTO_CGROUP_FULL_NOSPEC) { | |
823 | int has_sys_admin = 0; | |
824 | if (!lxc_list_empty(&conf->keepcaps)) { | |
825 | has_sys_admin = in_caplist(CAP_SYS_ADMIN, &conf->keepcaps); | |
826 | } else { | |
827 | has_sys_admin = !in_caplist(CAP_SYS_ADMIN, &conf->caps); | |
828 | } | |
829 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC) { | |
830 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_RW : LXC_AUTO_CGROUP_MIXED; | |
831 | } else { | |
832 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_FULL_RW : LXC_AUTO_CGROUP_FULL_MIXED; | |
833 | } | |
834 | } | |
835 | ||
8ede5f4c | 836 | if (!cgroup_mount(conf->rootfs.path ? conf->rootfs.mount : "", handler, cg_flags)) { |
368bbc02 | 837 | SYSERROR("error mounting /sys/fs/cgroup"); |
b06b8511 | 838 | return -1; |
368bbc02 CS |
839 | } |
840 | } | |
841 | ||
368bbc02 | 842 | return 0; |
368bbc02 CS |
843 | } |
844 | ||
a17b1e65 | 845 | static int mount_rootfs(const char *rootfs, const char *target, const char *options) |
0ad19a3f | 846 | { |
b09ef133 | 847 | char absrootfs[MAXPATHLEN]; |
78ae2fcc | 848 | struct stat s; |
a6afdde9 | 849 | int i; |
78ae2fcc | 850 | |
a17b1e65 | 851 | typedef int (*rootfs_cb)(const char *, const char *, const char *); |
78ae2fcc | 852 | |
853 | struct rootfs_type { | |
854 | int type; | |
855 | rootfs_cb cb; | |
856 | } rtfs_type[] = { | |
2656d231 DL |
857 | { S_IFDIR, mount_rootfs_dir }, |
858 | { S_IFBLK, mount_rootfs_block }, | |
859 | { S_IFREG, mount_rootfs_file }, | |
78ae2fcc | 860 | }; |
0ad19a3f | 861 | |
4c8ab83b | 862 | if (!realpath(rootfs, absrootfs)) { |
36eb9bde | 863 | SYSERROR("failed to get real path for '%s'", rootfs); |
4c8ab83b | 864 | return -1; |
865 | } | |
b09ef133 | 866 | |
b09ef133 | 867 | if (access(absrootfs, F_OK)) { |
36eb9bde | 868 | SYSERROR("'%s' is not accessible", absrootfs); |
b09ef133 | 869 | return -1; |
870 | } | |
871 | ||
78ae2fcc | 872 | if (stat(absrootfs, &s)) { |
36eb9bde | 873 | SYSERROR("failed to stat '%s'", absrootfs); |
9b0f0477 | 874 | return -1; |
875 | } | |
876 | ||
78ae2fcc | 877 | for (i = 0; i < sizeof(rtfs_type)/sizeof(rtfs_type[0]); i++) { |
9b0f0477 | 878 | |
78ae2fcc | 879 | if (!__S_ISTYPE(s.st_mode, rtfs_type[i].type)) |
880 | continue; | |
9b0f0477 | 881 | |
a17b1e65 | 882 | return rtfs_type[i].cb(absrootfs, target, options); |
78ae2fcc | 883 | } |
9b0f0477 | 884 | |
36eb9bde | 885 | ERROR("unsupported rootfs type for '%s'", absrootfs); |
78ae2fcc | 886 | return -1; |
0ad19a3f | 887 | } |
888 | ||
4e5440c6 | 889 | static int setup_utsname(struct utsname *utsname) |
0ad19a3f | 890 | { |
4e5440c6 DL |
891 | if (!utsname) |
892 | return 0; | |
0ad19a3f | 893 | |
4e5440c6 DL |
894 | if (sethostname(utsname->nodename, strlen(utsname->nodename))) { |
895 | SYSERROR("failed to set the hostname to '%s'", utsname->nodename); | |
0ad19a3f | 896 | return -1; |
897 | } | |
898 | ||
4e5440c6 | 899 | INFO("'%s' hostname has been setup", utsname->nodename); |
cd54d859 | 900 | |
0ad19a3f | 901 | return 0; |
902 | } | |
903 | ||
69aa6655 DE |
904 | struct dev_symlinks { |
905 | const char *oldpath; | |
906 | const char *name; | |
907 | }; | |
908 | ||
909 | static const struct dev_symlinks dev_symlinks[] = { | |
910 | {"/proc/self/fd", "fd"}, | |
911 | {"/proc/self/fd/0", "stdin"}, | |
912 | {"/proc/self/fd/1", "stdout"}, | |
913 | {"/proc/self/fd/2", "stderr"}, | |
914 | }; | |
915 | ||
916 | static int setup_dev_symlinks(const struct lxc_rootfs *rootfs) | |
917 | { | |
918 | char path[MAXPATHLEN]; | |
919 | int ret,i; | |
09227be2 | 920 | struct stat s; |
69aa6655 DE |
921 | |
922 | ||
923 | for (i = 0; i < sizeof(dev_symlinks) / sizeof(dev_symlinks[0]); i++) { | |
924 | const struct dev_symlinks *d = &dev_symlinks[i]; | |
ec50007f | 925 | ret = snprintf(path, sizeof(path), "%s/dev/%s", rootfs->path ? rootfs->mount : "", d->name); |
69aa6655 DE |
926 | if (ret < 0 || ret >= MAXPATHLEN) |
927 | return -1; | |
09227be2 MW |
928 | |
929 | /* | |
930 | * Stat the path first. If we don't get an error | |
931 | * accept it as is and don't try to create it | |
932 | */ | |
933 | if (!stat(path, &s)) { | |
934 | continue; | |
935 | } | |
936 | ||
69aa6655 | 937 | ret = symlink(d->oldpath, path); |
09227be2 | 938 | |
69aa6655 | 939 | if (ret && errno != EEXIST) { |
09227be2 MW |
940 | if ( errno == EROFS ) { |
941 | WARN("Warning: Read Only file system while creating %s", path); | |
942 | } else { | |
943 | SYSERROR("Error creating %s", path); | |
944 | return -1; | |
945 | } | |
69aa6655 DE |
946 | } |
947 | } | |
948 | return 0; | |
949 | } | |
950 | ||
393903d1 SH |
951 | /* |
952 | * Build a space-separate list of ptys to pass to systemd. | |
953 | */ | |
954 | static bool append_ptyname(char **pp, char *name) | |
b0a33c1e | 955 | { |
393903d1 SH |
956 | char *p; |
957 | ||
958 | if (!*pp) { | |
959 | *pp = malloc(strlen(name) + strlen("container_ttys=") + 1); | |
960 | if (!*pp) | |
961 | return false; | |
962 | sprintf(*pp, "container_ttys=%s", name); | |
963 | return true; | |
964 | } | |
965 | p = realloc(*pp, strlen(*pp) + strlen(name) + 2); | |
966 | if (!p) | |
967 | return false; | |
968 | *pp = p; | |
969 | strcat(p, " "); | |
970 | strcat(p, name); | |
971 | return true; | |
972 | } | |
973 | ||
974 | static int setup_tty(struct lxc_conf *conf) | |
975 | { | |
393903d1 SH |
976 | const struct lxc_tty_info *tty_info = &conf->tty_info; |
977 | char *ttydir = conf->ttydir; | |
7c6ef2a2 SH |
978 | char path[MAXPATHLEN], lxcpath[MAXPATHLEN]; |
979 | int i, ret; | |
b0a33c1e | 980 | |
e8bd4e43 | 981 | if (!conf->rootfs.path) |
bc9bd0e3 DL |
982 | return 0; |
983 | ||
b0a33c1e | 984 | for (i = 0; i < tty_info->nbtty; i++) { |
985 | ||
986 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; | |
987 | ||
e8bd4e43 | 988 | ret = snprintf(path, sizeof(path), "/dev/tty%d", i + 1); |
7c6ef2a2 SH |
989 | if (ret >= sizeof(path)) { |
990 | ERROR("pathname too long for ttys"); | |
991 | return -1; | |
992 | } | |
993 | if (ttydir) { | |
994 | /* create dev/lxc/tty%d" */ | |
e8bd4e43 | 995 | ret = snprintf(lxcpath, sizeof(lxcpath), "/dev/%s/tty%d", ttydir, i + 1); |
7c6ef2a2 SH |
996 | if (ret >= sizeof(lxcpath)) { |
997 | ERROR("pathname too long for ttys"); | |
998 | return -1; | |
999 | } | |
1000 | ret = creat(lxcpath, 0660); | |
1001 | if (ret==-1 && errno != EEXIST) { | |
959aee9c | 1002 | SYSERROR("error creating %s", lxcpath); |
7c6ef2a2 SH |
1003 | return -1; |
1004 | } | |
4d44e274 SH |
1005 | if (ret >= 0) |
1006 | close(ret); | |
7c6ef2a2 SH |
1007 | ret = unlink(path); |
1008 | if (ret && errno != ENOENT) { | |
959aee9c | 1009 | SYSERROR("error unlinking %s", path); |
7c6ef2a2 SH |
1010 | return -1; |
1011 | } | |
b0a33c1e | 1012 | |
7c6ef2a2 SH |
1013 | if (mount(pty_info->name, lxcpath, "none", MS_BIND, 0)) { |
1014 | WARN("failed to mount '%s'->'%s'", | |
1015 | pty_info->name, path); | |
1016 | continue; | |
1017 | } | |
13954cce | 1018 | |
9ba8130c SH |
1019 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/tty%d", ttydir, i+1); |
1020 | if (ret >= sizeof(lxcpath)) { | |
1021 | ERROR("tty pathname too long"); | |
1022 | return -1; | |
1023 | } | |
7c6ef2a2 SH |
1024 | ret = symlink(lxcpath, path); |
1025 | if (ret) { | |
959aee9c | 1026 | SYSERROR("failed to create symlink for tty %d", i+1); |
7c6ef2a2 SH |
1027 | return -1; |
1028 | } | |
1029 | } else { | |
c6883f38 SH |
1030 | /* If we populated /dev, then we need to create /dev/ttyN */ |
1031 | if (access(path, F_OK)) { | |
1032 | ret = creat(path, 0660); | |
1033 | if (ret==-1) { | |
959aee9c | 1034 | SYSERROR("error creating %s", path); |
c6883f38 | 1035 | /* this isn't fatal, continue */ |
025ed0f3 | 1036 | } else { |
c6883f38 | 1037 | close(ret); |
025ed0f3 | 1038 | } |
c6883f38 | 1039 | } |
7c6ef2a2 | 1040 | if (mount(pty_info->name, path, "none", MS_BIND, 0)) { |
e8bd4e43 | 1041 | SYSERROR("failed to mount '%s'->'%s'", pty_info->name, path); |
7c6ef2a2 SH |
1042 | continue; |
1043 | } | |
393903d1 | 1044 | } |
e8bd4e43 | 1045 | if (!append_ptyname(&conf->pty_names, pty_info->name)) { |
393903d1 SH |
1046 | ERROR("Error setting up container_ttys string"); |
1047 | return -1; | |
b0a33c1e | 1048 | } |
1049 | } | |
1050 | ||
cd54d859 DL |
1051 | INFO("%d tty(s) has been setup", tty_info->nbtty); |
1052 | ||
b0a33c1e | 1053 | return 0; |
1054 | } | |
1055 | ||
bf601689 | 1056 | |
59bb8698 | 1057 | static int setup_rootfs_pivot_root(const char *rootfs) |
bf601689 | 1058 | { |
2d489f9e | 1059 | int oldroot = -1, newroot = -1; |
bf601689 | 1060 | |
2d489f9e SH |
1061 | oldroot = open("/", O_DIRECTORY | O_RDONLY); |
1062 | if (oldroot < 0) { | |
1063 | SYSERROR("Error opening old-/ for fchdir"); | |
9ba8130c SH |
1064 | return -1; |
1065 | } | |
2d489f9e SH |
1066 | newroot = open(rootfs, O_DIRECTORY | O_RDONLY); |
1067 | if (newroot < 0) { | |
1068 | SYSERROR("Error opening new-/ for fchdir"); | |
1069 | goto fail; | |
c08556c6 | 1070 | } |
bf601689 | 1071 | |
cc6f6dd7 | 1072 | /* change into new root fs */ |
2d489f9e | 1073 | if (fchdir(newroot)) { |
cc6f6dd7 | 1074 | SYSERROR("can't chdir to new rootfs '%s'", rootfs); |
2d489f9e | 1075 | goto fail; |
cc6f6dd7 DL |
1076 | } |
1077 | ||
cc6f6dd7 | 1078 | /* pivot_root into our new root fs */ |
2d489f9e | 1079 | if (pivot_root(".", ".")) { |
cc6f6dd7 | 1080 | SYSERROR("pivot_root syscall failed"); |
2d489f9e | 1081 | goto fail; |
bf601689 | 1082 | } |
cc6f6dd7 | 1083 | |
2d489f9e SH |
1084 | /* |
1085 | * at this point the old-root is mounted on top of our new-root | |
1086 | * To unmounted it we must not be chdir'd into it, so escape back | |
1087 | * to old-root | |
1088 | */ | |
1089 | if (fchdir(oldroot) < 0) { | |
1090 | SYSERROR("Error entering oldroot"); | |
1091 | goto fail; | |
1092 | } | |
7981ea46 | 1093 | if (umount2(".", MNT_DETACH) < 0) { |
2d489f9e SH |
1094 | SYSERROR("Error detaching old root"); |
1095 | goto fail; | |
cc6f6dd7 DL |
1096 | } |
1097 | ||
2d489f9e SH |
1098 | if (fchdir(newroot) < 0) { |
1099 | SYSERROR("Error re-entering newroot"); | |
1100 | goto fail; | |
1101 | } | |
cc6f6dd7 | 1102 | |
2d489f9e SH |
1103 | close(oldroot); |
1104 | close(newroot); | |
bf601689 | 1105 | |
2d489f9e | 1106 | DEBUG("pivot_root syscall to '%s' successful", rootfs); |
bf601689 | 1107 | |
bf601689 | 1108 | return 0; |
2d489f9e SH |
1109 | |
1110 | fail: | |
1111 | if (oldroot != -1) | |
1112 | close(oldroot); | |
1113 | if (newroot != -1) | |
1114 | close(newroot); | |
1115 | return -1; | |
bf601689 MH |
1116 | } |
1117 | ||
bc6928ff | 1118 | /* |
87da4ec3 SH |
1119 | * Just create a path for /dev under $lxcpath/$name and in rootfs |
1120 | * If we hit an error, log it but don't fail yet. | |
91c3830e | 1121 | */ |
14221cbb | 1122 | static int mount_autodev(const char *name, const struct lxc_rootfs *rootfs, const char *lxcpath) |
91c3830e SH |
1123 | { |
1124 | int ret; | |
87da4ec3 SH |
1125 | size_t clen; |
1126 | char *path; | |
91c3830e | 1127 | |
14221cbb | 1128 | INFO("Mounting container /dev"); |
bc6928ff | 1129 | |
14221cbb | 1130 | /* $(rootfs->mount) + "/dev/pts" + '\0' */ |
ec50007f | 1131 | clen = (rootfs->path ? strlen(rootfs->mount) : 0) + 9; |
87da4ec3 | 1132 | path = alloca(clen); |
bc6928ff | 1133 | |
ec50007f | 1134 | ret = snprintf(path, clen, "%s/dev", rootfs->path ? rootfs->mount : ""); |
87da4ec3 | 1135 | if (ret < 0 || ret >= clen) |
91c3830e | 1136 | return -1; |
bc6928ff | 1137 | |
87da4ec3 | 1138 | if (!dir_exists(path)) { |
14221cbb | 1139 | WARN("No /dev in container."); |
87da4ec3 SH |
1140 | WARN("Proceeding without autodev setup"); |
1141 | return 0; | |
bc6928ff | 1142 | } |
87da4ec3 | 1143 | |
1ec0e8e3 | 1144 | ret = safe_mount("none", path, "tmpfs", 0, "size=500000,mode=755", |
ec50007f | 1145 | rootfs->path ? rootfs->mount : NULL); |
1ec0e8e3 | 1146 | if (ret != 0) { |
87da4ec3 | 1147 | SYSERROR("Failed mounting tmpfs onto %s\n", path); |
1ec0e8e3 | 1148 | return -1; |
91c3830e | 1149 | } |
87da4ec3 SH |
1150 | |
1151 | INFO("Mounted tmpfs onto %s", path); | |
1152 | ||
ec50007f | 1153 | ret = snprintf(path, clen, "%s/dev/pts", rootfs->path ? rootfs->mount : ""); |
87da4ec3 | 1154 | if (ret < 0 || ret >= clen) |
91c3830e | 1155 | return -1; |
87da4ec3 | 1156 | |
bc6928ff MW |
1157 | /* |
1158 | * If we are running on a devtmpfs mapping, dev/pts may already exist. | |
1159 | * If not, then create it and exit if that fails... | |
1160 | */ | |
87da4ec3 | 1161 | if (!dir_exists(path)) { |
bc6928ff MW |
1162 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
1163 | if (ret) { | |
1164 | SYSERROR("Failed to create /dev/pts in container"); | |
1165 | return -1; | |
1166 | } | |
91c3830e SH |
1167 | } |
1168 | ||
14221cbb | 1169 | INFO("Mounted container /dev"); |
91c3830e SH |
1170 | return 0; |
1171 | } | |
1172 | ||
c6883f38 | 1173 | struct lxc_devs { |
74a3920a | 1174 | const char *name; |
c6883f38 SH |
1175 | mode_t mode; |
1176 | int maj; | |
1177 | int min; | |
1178 | }; | |
1179 | ||
74a3920a | 1180 | static const struct lxc_devs lxc_devs[] = { |
c6883f38 SH |
1181 | { "null", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 3 }, |
1182 | { "zero", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 5 }, | |
1183 | { "full", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 7 }, | |
1184 | { "urandom", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 9 }, | |
1185 | { "random", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 8 }, | |
1186 | { "tty", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 5, 0 }, | |
1187 | { "console", S_IFCHR | S_IRUSR | S_IWUSR, 5, 1 }, | |
1188 | }; | |
1189 | ||
0728ebf4 | 1190 | static int fill_autodev(const struct lxc_rootfs *rootfs, bool mount_console) |
c6883f38 SH |
1191 | { |
1192 | int ret; | |
c6883f38 SH |
1193 | char path[MAXPATHLEN]; |
1194 | int i; | |
3a32201c | 1195 | mode_t cmask; |
c6883f38 | 1196 | |
14221cbb | 1197 | INFO("Creating initial consoles under container /dev"); |
91c3830e | 1198 | |
ec50007f | 1199 | ret = snprintf(path, MAXPATHLEN, "%s/dev", rootfs->path ? rootfs->mount : ""); |
91c3830e SH |
1200 | if (ret < 0 || ret >= MAXPATHLEN) { |
1201 | ERROR("Error calculating container /dev location"); | |
c6883f38 | 1202 | return -1; |
f7bee6c6 | 1203 | } |
91c3830e | 1204 | |
9769034f | 1205 | if (!dir_exists(path)) // ignore, just don't try to fill in |
9cb4d183 SH |
1206 | return 0; |
1207 | ||
14221cbb | 1208 | INFO("Populating container /dev"); |
3a32201c | 1209 | cmask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
c6883f38 | 1210 | for (i = 0; i < sizeof(lxc_devs) / sizeof(lxc_devs[0]); i++) { |
74a3920a | 1211 | const struct lxc_devs *d = &lxc_devs[i]; |
0728ebf4 TA |
1212 | |
1213 | if (!strcmp(d->name, "console") && !mount_console) | |
1214 | continue; | |
1215 | ||
ec50007f | 1216 | ret = snprintf(path, MAXPATHLEN, "%s/dev/%s", rootfs->path ? rootfs->mount : "", d->name); |
c6883f38 SH |
1217 | if (ret < 0 || ret >= MAXPATHLEN) |
1218 | return -1; | |
1219 | ret = mknod(path, d->mode, makedev(d->maj, d->min)); | |
91c3830e | 1220 | if (ret && errno != EEXIST) { |
9cb4d183 SH |
1221 | char hostpath[MAXPATHLEN]; |
1222 | FILE *pathfile; | |
1223 | ||
1224 | // Unprivileged containers cannot create devices, so | |
1225 | // bind mount the device from the host | |
1226 | ret = snprintf(hostpath, MAXPATHLEN, "/dev/%s", d->name); | |
1227 | if (ret < 0 || ret >= MAXPATHLEN) | |
1228 | return -1; | |
1229 | pathfile = fopen(path, "wb"); | |
1230 | if (!pathfile) { | |
1231 | SYSERROR("Failed to create device mount target '%s'", path); | |
1232 | return -1; | |
1233 | } | |
1234 | fclose(pathfile); | |
592fd47a | 1235 | if (safe_mount(hostpath, path, 0, MS_BIND, NULL, |
ec50007f | 1236 | rootfs->path ? rootfs->mount : NULL) != 0) { |
9cb4d183 SH |
1237 | SYSERROR("Failed bind mounting device %s from host into container", |
1238 | d->name); | |
1239 | return -1; | |
1240 | } | |
c6883f38 SH |
1241 | } |
1242 | } | |
3a32201c | 1243 | umask(cmask); |
c6883f38 | 1244 | |
14221cbb | 1245 | INFO("Populated container /dev"); |
c6883f38 SH |
1246 | return 0; |
1247 | } | |
1248 | ||
cc28d0b0 | 1249 | static int setup_rootfs(struct lxc_conf *conf) |
0ad19a3f | 1250 | { |
cc28d0b0 SH |
1251 | const struct lxc_rootfs *rootfs = &conf->rootfs; |
1252 | ||
a0f379bf DW |
1253 | if (!rootfs->path) { |
1254 | if (mount("", "/", NULL, MS_SLAVE|MS_REC, 0)) { | |
1255 | SYSERROR("Failed to make / rslave"); | |
1256 | return -1; | |
1257 | } | |
c69bd12f | 1258 | return 0; |
a0f379bf | 1259 | } |
0ad19a3f | 1260 | |
12297168 | 1261 | if (access(rootfs->mount, F_OK)) { |
b1789442 | 1262 | SYSERROR("failed to access to '%s', check it is present", |
12297168 | 1263 | rootfs->mount); |
b1789442 DL |
1264 | return -1; |
1265 | } | |
1266 | ||
9be53773 | 1267 | // First try mounting rootfs using a bdev |
76a26f55 | 1268 | struct bdev *bdev = bdev_init(conf, rootfs->path, rootfs->mount, rootfs->options); |
9be53773 | 1269 | if (bdev && bdev->ops->mount(bdev) == 0) { |
59d66af2 | 1270 | bdev_put(bdev); |
9be53773 SH |
1271 | DEBUG("mounted '%s' on '%s'", rootfs->path, rootfs->mount); |
1272 | return 0; | |
1273 | } | |
59d66af2 SH |
1274 | if (bdev) |
1275 | bdev_put(bdev); | |
a17b1e65 | 1276 | if (mount_rootfs(rootfs->path, rootfs->mount, rootfs->options)) { |
a6afdde9 | 1277 | ERROR("failed to mount rootfs"); |
c3f0a28c | 1278 | return -1; |
1279 | } | |
0ad19a3f | 1280 | |
12297168 | 1281 | DEBUG("mounted '%s' on '%s'", rootfs->path, rootfs->mount); |
c69bd12f | 1282 | |
ac778708 DL |
1283 | return 0; |
1284 | } | |
1285 | ||
91e93c71 AV |
1286 | int prepare_ramfs_root(char *root) |
1287 | { | |
eab15c1e | 1288 | char buf[LXC_LINELEN], *p; |
91e93c71 AV |
1289 | char nroot[PATH_MAX]; |
1290 | FILE *f; | |
1291 | int i; | |
1292 | char *p2; | |
1293 | ||
1294 | if (realpath(root, nroot) == NULL) | |
1295 | return -1; | |
1296 | ||
1297 | if (chdir("/") == -1) | |
1298 | return -1; | |
1299 | ||
1300 | /* | |
1301 | * We could use here MS_MOVE, but in userns this mount is | |
1302 | * locked and can't be moved. | |
1303 | */ | |
1304 | if (mount(root, "/", NULL, MS_REC | MS_BIND, NULL)) { | |
1305 | SYSERROR("Failed to move %s into /", root); | |
1306 | return -1; | |
1307 | } | |
1308 | ||
88322f77 | 1309 | if (mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL)) { |
91e93c71 AV |
1310 | SYSERROR("Failed to make . rprivate"); |
1311 | return -1; | |
1312 | } | |
1313 | ||
1314 | /* | |
1315 | * The following code cleans up inhereted mounts which are not | |
1316 | * required for CT. | |
1317 | * | |
1318 | * The mountinfo file shows not all mounts, if a few points have been | |
1319 | * unmounted between read operations from the mountinfo. So we need to | |
1320 | * read mountinfo a few times. | |
1321 | * | |
1322 | * This loop can be skipped if a container uses unserns, because all | |
1323 | * inherited mounts are locked and we should live with all this trash. | |
1324 | */ | |
1325 | while (1) { | |
1326 | int progress = 0; | |
1327 | ||
1328 | f = fopen("./proc/self/mountinfo", "r"); | |
1329 | if (!f) { | |
1330 | SYSERROR("Unable to open /proc/self/mountinfo"); | |
1331 | return -1; | |
1332 | } | |
eab15c1e | 1333 | while (fgets(buf, LXC_LINELEN, f)) { |
91e93c71 AV |
1334 | for (p = buf, i=0; p && i < 4; i++) |
1335 | p = strchr(p+1, ' '); | |
1336 | if (!p) | |
1337 | continue; | |
1338 | p2 = strchr(p+1, ' '); | |
1339 | if (!p2) | |
1340 | continue; | |
1341 | ||
1342 | *p2 = '\0'; | |
1343 | *p = '.'; | |
1344 | ||
1345 | if (strcmp(p + 1, "/") == 0) | |
1346 | continue; | |
1347 | if (strcmp(p + 1, "/proc") == 0) | |
1348 | continue; | |
1349 | ||
1350 | if (umount2(p, MNT_DETACH) == 0) | |
1351 | progress++; | |
1352 | } | |
1353 | fclose(f); | |
1354 | if (!progress) | |
1355 | break; | |
1356 | } | |
1357 | ||
8bea9fae PR |
1358 | /* This also can be skipped if a container uses unserns */ |
1359 | umount2("./proc", MNT_DETACH); | |
91e93c71 AV |
1360 | |
1361 | /* It is weird, but chdir("..") moves us in a new root */ | |
1362 | if (chdir("..") == -1) { | |
1363 | SYSERROR("Unable to change working directory"); | |
1364 | return -1; | |
1365 | } | |
1366 | ||
1367 | if (chroot(".") == -1) { | |
1368 | SYSERROR("Unable to chroot"); | |
1369 | return -1; | |
1370 | } | |
1371 | ||
1372 | return 0; | |
1373 | } | |
1374 | ||
74a3920a | 1375 | static int setup_pivot_root(const struct lxc_rootfs *rootfs) |
ac778708 | 1376 | { |
ac778708 DL |
1377 | if (!rootfs->path) |
1378 | return 0; | |
1379 | ||
91e93c71 AV |
1380 | if (detect_ramfs_rootfs()) { |
1381 | if (prepare_ramfs_root(rootfs->mount)) | |
1382 | return -1; | |
59bb8698 | 1383 | } else if (setup_rootfs_pivot_root(rootfs->mount)) { |
cc6f6dd7 | 1384 | ERROR("failed to setup pivot root"); |
25368b52 | 1385 | return -1; |
c69bd12f DL |
1386 | } |
1387 | ||
25368b52 | 1388 | return 0; |
0ad19a3f | 1389 | } |
1390 | ||
d852c78c | 1391 | static int setup_pts(int pts) |
3c26f34e | 1392 | { |
77890c6d SW |
1393 | char target[PATH_MAX]; |
1394 | ||
d852c78c DL |
1395 | if (!pts) |
1396 | return 0; | |
3c26f34e | 1397 | |
1398 | if (!access("/dev/pts/ptmx", F_OK) && umount("/dev/pts")) { | |
36eb9bde | 1399 | SYSERROR("failed to umount 'dev/pts'"); |
3c26f34e | 1400 | return -1; |
1401 | } | |
1402 | ||
7e40254a JTLB |
1403 | if (mkdir("/dev/pts", 0755)) { |
1404 | if ( errno != EEXIST ) { | |
1405 | SYSERROR("failed to create '/dev/pts'"); | |
1406 | return -1; | |
1407 | } | |
1408 | } | |
1409 | ||
a6afdde9 | 1410 | if (mount("devpts", "/dev/pts", "devpts", MS_MGC_VAL, |
67e5a20a | 1411 | "newinstance,ptmxmode=0666,mode=0620,gid=5")) { |
36eb9bde | 1412 | SYSERROR("failed to mount a new instance of '/dev/pts'"); |
3c26f34e | 1413 | return -1; |
1414 | } | |
1415 | ||
3c26f34e | 1416 | if (access("/dev/ptmx", F_OK)) { |
1417 | if (!symlink("/dev/pts/ptmx", "/dev/ptmx")) | |
1418 | goto out; | |
36eb9bde | 1419 | SYSERROR("failed to symlink '/dev/pts/ptmx'->'/dev/ptmx'"); |
3c26f34e | 1420 | return -1; |
1421 | } | |
1422 | ||
77890c6d SW |
1423 | if (realpath("/dev/ptmx", target) && !strcmp(target, "/dev/pts/ptmx")) |
1424 | goto out; | |
1425 | ||
3c26f34e | 1426 | /* fallback here, /dev/pts/ptmx exists just mount bind */ |
1427 | if (mount("/dev/pts/ptmx", "/dev/ptmx", "none", MS_BIND, 0)) { | |
36eb9bde | 1428 | SYSERROR("mount failed '/dev/pts/ptmx'->'/dev/ptmx'"); |
3c26f34e | 1429 | return -1; |
1430 | } | |
cd54d859 DL |
1431 | |
1432 | INFO("created new pts instance"); | |
d852c78c | 1433 | |
3c26f34e | 1434 | out: |
1435 | return 0; | |
1436 | } | |
1437 | ||
cccc74b5 DL |
1438 | static int setup_personality(int persona) |
1439 | { | |
6ff05e18 | 1440 | #if HAVE_SYS_PERSONALITY_H |
cccc74b5 DL |
1441 | if (persona == -1) |
1442 | return 0; | |
1443 | ||
1444 | if (personality(persona) < 0) { | |
1445 | SYSERROR("failed to set personality to '0x%x'", persona); | |
1446 | return -1; | |
1447 | } | |
1448 | ||
1449 | INFO("set personality to '0x%x'", persona); | |
6ff05e18 | 1450 | #endif |
cccc74b5 DL |
1451 | |
1452 | return 0; | |
1453 | } | |
1454 | ||
7c6ef2a2 | 1455 | static int setup_dev_console(const struct lxc_rootfs *rootfs, |
33fcb7a0 | 1456 | const struct lxc_console *console) |
6e590161 | 1457 | { |
63376d7d | 1458 | char path[MAXPATHLEN]; |
0728ebf4 | 1459 | int ret, fd; |
52e35957 | 1460 | |
7c6ef2a2 SH |
1461 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs->mount); |
1462 | if (ret >= sizeof(path)) { | |
959aee9c | 1463 | ERROR("console path too long"); |
7c6ef2a2 SH |
1464 | return -1; |
1465 | } | |
52e35957 | 1466 | |
0728ebf4 TA |
1467 | fd = open(path, O_CREAT | O_EXCL, S_IXUSR | S_IXGRP | S_IXOTH); |
1468 | if (fd < 0) { | |
1469 | if (errno != EEXIST) { | |
1470 | SYSERROR("failed to create console"); | |
1471 | return -1; | |
1472 | } | |
1473 | } else { | |
1474 | close(fd); | |
52e35957 DL |
1475 | } |
1476 | ||
b5159817 DE |
1477 | if (console->master < 0) { |
1478 | INFO("no console"); | |
f78a1f32 DL |
1479 | return 0; |
1480 | } | |
ed502555 | 1481 | |
0728ebf4 | 1482 | if (chmod(console->name, S_IXUSR | S_IXGRP | S_IXOTH)) { |
63376d7d | 1483 | SYSERROR("failed to set mode '0%o' to '%s'", |
0728ebf4 | 1484 | S_IXUSR | S_IXGRP | S_IXOTH, console->name); |
63376d7d DL |
1485 | return -1; |
1486 | } | |
13954cce | 1487 | |
592fd47a | 1488 | if (safe_mount(console->name, path, "none", MS_BIND, 0, rootfs->mount)) { |
63376d7d | 1489 | ERROR("failed to mount '%s' on '%s'", console->name, path); |
6e590161 | 1490 | return -1; |
1491 | } | |
1492 | ||
63376d7d | 1493 | INFO("console has been setup"); |
7c6ef2a2 SH |
1494 | return 0; |
1495 | } | |
1496 | ||
1497 | static int setup_ttydir_console(const struct lxc_rootfs *rootfs, | |
1498 | const struct lxc_console *console, | |
1499 | char *ttydir) | |
1500 | { | |
1501 | char path[MAXPATHLEN], lxcpath[MAXPATHLEN]; | |
1502 | int ret; | |
1503 | ||
1504 | /* create rootfs/dev/<ttydir> directory */ | |
1505 | ret = snprintf(path, sizeof(path), "%s/dev/%s", rootfs->mount, | |
1506 | ttydir); | |
1507 | if (ret >= sizeof(path)) | |
1508 | return -1; | |
1509 | ret = mkdir(path, 0755); | |
1510 | if (ret && errno != EEXIST) { | |
959aee9c | 1511 | SYSERROR("failed with errno %d to create %s", errno, path); |
7c6ef2a2 SH |
1512 | return -1; |
1513 | } | |
959aee9c | 1514 | INFO("created %s", path); |
7c6ef2a2 SH |
1515 | |
1516 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/dev/%s/console", | |
1517 | rootfs->mount, ttydir); | |
1518 | if (ret >= sizeof(lxcpath)) { | |
959aee9c | 1519 | ERROR("console path too long"); |
7c6ef2a2 SH |
1520 | return -1; |
1521 | } | |
1522 | ||
1523 | snprintf(path, sizeof(path), "%s/dev/console", rootfs->mount); | |
1524 | ret = unlink(path); | |
1525 | if (ret && errno != ENOENT) { | |
959aee9c | 1526 | SYSERROR("error unlinking %s", path); |
7c6ef2a2 SH |
1527 | return -1; |
1528 | } | |
1529 | ||
1530 | ret = creat(lxcpath, 0660); | |
1531 | if (ret==-1 && errno != EEXIST) { | |
959aee9c | 1532 | SYSERROR("error %d creating %s", errno, lxcpath); |
7c6ef2a2 SH |
1533 | return -1; |
1534 | } | |
4d44e274 SH |
1535 | if (ret >= 0) |
1536 | close(ret); | |
7c6ef2a2 | 1537 | |
b5159817 DE |
1538 | if (console->master < 0) { |
1539 | INFO("no console"); | |
7c6ef2a2 SH |
1540 | return 0; |
1541 | } | |
1542 | ||
592fd47a | 1543 | if (safe_mount(console->name, lxcpath, "none", MS_BIND, 0, rootfs->mount)) { |
7c6ef2a2 SH |
1544 | ERROR("failed to mount '%s' on '%s'", console->name, lxcpath); |
1545 | return -1; | |
1546 | } | |
1547 | ||
1548 | /* create symlink from rootfs/dev/console to 'lxc/console' */ | |
9ba8130c SH |
1549 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/console", ttydir); |
1550 | if (ret >= sizeof(lxcpath)) { | |
1551 | ERROR("lxc/console path too long"); | |
1552 | return -1; | |
1553 | } | |
7c6ef2a2 SH |
1554 | ret = symlink(lxcpath, path); |
1555 | if (ret) { | |
1556 | SYSERROR("failed to create symlink for console"); | |
1557 | return -1; | |
1558 | } | |
1559 | ||
1560 | INFO("console has been setup on %s", lxcpath); | |
cd54d859 | 1561 | |
6e590161 | 1562 | return 0; |
1563 | } | |
1564 | ||
7c6ef2a2 SH |
1565 | static int setup_console(const struct lxc_rootfs *rootfs, |
1566 | const struct lxc_console *console, | |
1567 | char *ttydir) | |
1568 | { | |
1569 | /* We don't have a rootfs, /dev/console will be shared */ | |
1570 | if (!rootfs->path) | |
1571 | return 0; | |
1572 | if (!ttydir) | |
1573 | return setup_dev_console(rootfs, console); | |
1574 | ||
1575 | return setup_ttydir_console(rootfs, console, ttydir); | |
1576 | } | |
1577 | ||
1bd051a6 SH |
1578 | static int setup_kmsg(const struct lxc_rootfs *rootfs, |
1579 | const struct lxc_console *console) | |
1580 | { | |
1581 | char kpath[MAXPATHLEN]; | |
1582 | int ret; | |
1583 | ||
222fea5a DE |
1584 | if (!rootfs->path) |
1585 | return 0; | |
1bd051a6 SH |
1586 | ret = snprintf(kpath, sizeof(kpath), "%s/dev/kmsg", rootfs->mount); |
1587 | if (ret < 0 || ret >= sizeof(kpath)) | |
1588 | return -1; | |
1589 | ||
1590 | ret = unlink(kpath); | |
1591 | if (ret && errno != ENOENT) { | |
959aee9c | 1592 | SYSERROR("error unlinking %s", kpath); |
1bd051a6 SH |
1593 | return -1; |
1594 | } | |
1595 | ||
1596 | ret = symlink("console", kpath); | |
1597 | if (ret) { | |
1598 | SYSERROR("failed to create symlink for kmsg"); | |
1599 | return -1; | |
1600 | } | |
1601 | ||
1602 | return 0; | |
1603 | } | |
1604 | ||
998ac676 RT |
1605 | static void parse_mntopt(char *opt, unsigned long *flags, char **data) |
1606 | { | |
1607 | struct mount_opt *mo; | |
1608 | ||
1609 | /* If opt is found in mount_opt, set or clear flags. | |
1610 | * Otherwise append it to data. */ | |
1611 | ||
1612 | for (mo = &mount_opt[0]; mo->name != NULL; mo++) { | |
1613 | if (!strncmp(opt, mo->name, strlen(mo->name))) { | |
1614 | if (mo->clear) | |
1615 | *flags &= ~mo->flag; | |
1616 | else | |
1617 | *flags |= mo->flag; | |
1618 | return; | |
1619 | } | |
1620 | } | |
1621 | ||
1622 | if (strlen(*data)) | |
1623 | strcat(*data, ","); | |
1624 | strcat(*data, opt); | |
1625 | } | |
1626 | ||
a17b1e65 | 1627 | int parse_mntopts(const char *mntopts, unsigned long *mntflags, |
998ac676 RT |
1628 | char **mntdata) |
1629 | { | |
1630 | char *s, *data; | |
1631 | char *p, *saveptr = NULL; | |
1632 | ||
911324ef | 1633 | *mntdata = NULL; |
91656ce5 | 1634 | *mntflags = 0L; |
911324ef DL |
1635 | |
1636 | if (!mntopts) | |
998ac676 RT |
1637 | return 0; |
1638 | ||
911324ef | 1639 | s = strdup(mntopts); |
998ac676 | 1640 | if (!s) { |
36eb9bde | 1641 | SYSERROR("failed to allocate memory"); |
998ac676 RT |
1642 | return -1; |
1643 | } | |
1644 | ||
1645 | data = malloc(strlen(s) + 1); | |
1646 | if (!data) { | |
36eb9bde | 1647 | SYSERROR("failed to allocate memory"); |
998ac676 RT |
1648 | free(s); |
1649 | return -1; | |
1650 | } | |
1651 | *data = 0; | |
1652 | ||
1653 | for (p = strtok_r(s, ",", &saveptr); p != NULL; | |
1654 | p = strtok_r(NULL, ",", &saveptr)) | |
1655 | parse_mntopt(p, mntflags, &data); | |
1656 | ||
1657 | if (*data) | |
1658 | *mntdata = data; | |
1659 | else | |
1660 | free(data); | |
1661 | free(s); | |
1662 | ||
1663 | return 0; | |
1664 | } | |
1665 | ||
6fd5e769 SH |
1666 | static void null_endofword(char *word) |
1667 | { | |
1668 | while (*word && *word != ' ' && *word != '\t') | |
1669 | word++; | |
1670 | *word = '\0'; | |
1671 | } | |
1672 | ||
1673 | /* | |
1674 | * skip @nfields spaces in @src | |
1675 | */ | |
1676 | static char *get_field(char *src, int nfields) | |
1677 | { | |
1678 | char *p = src; | |
1679 | int i; | |
1680 | ||
1681 | for (i = 0; i < nfields; i++) { | |
1682 | while (*p && *p != ' ' && *p != '\t') | |
1683 | p++; | |
1684 | if (!*p) | |
1685 | break; | |
1686 | p++; | |
1687 | } | |
1688 | return p; | |
1689 | } | |
1690 | ||
911324ef DL |
1691 | static int mount_entry(const char *fsname, const char *target, |
1692 | const char *fstype, unsigned long mountflags, | |
ae7a770e | 1693 | const char *data, int optional, int dev, const char *rootfs) |
911324ef | 1694 | { |
614305f3 | 1695 | #ifdef HAVE_STATVFS |
2938f7c8 | 1696 | struct statvfs sb; |
614305f3 | 1697 | #endif |
2938f7c8 | 1698 | |
592fd47a | 1699 | if (safe_mount(fsname, target, fstype, mountflags & ~MS_REMOUNT, data, rootfs)) { |
1fc64d22 SG |
1700 | if (optional) { |
1701 | INFO("failed to mount '%s' on '%s' (optional): %s", fsname, | |
1702 | target, strerror(errno)); | |
1703 | return 0; | |
1704 | } | |
1705 | else { | |
1706 | SYSERROR("failed to mount '%s' on '%s'", fsname, target); | |
1707 | return -1; | |
1708 | } | |
911324ef DL |
1709 | } |
1710 | ||
1711 | if ((mountflags & MS_REMOUNT) || (mountflags & MS_BIND)) { | |
2938f7c8 SH |
1712 | DEBUG("remounting %s on %s to respect bind or remount options", |
1713 | fsname ? fsname : "(none)", target ? target : "(none)"); | |
7c5b6e7c AS |
1714 | unsigned long rqd_flags = 0; |
1715 | if (mountflags & MS_RDONLY) | |
1716 | rqd_flags |= MS_RDONLY; | |
614305f3 | 1717 | #ifdef HAVE_STATVFS |
2938f7c8 | 1718 | if (statvfs(fsname, &sb) == 0) { |
7c5b6e7c | 1719 | unsigned long required_flags = rqd_flags; |
2938f7c8 SH |
1720 | if (sb.f_flag & MS_NOSUID) |
1721 | required_flags |= MS_NOSUID; | |
ae7a770e | 1722 | if (sb.f_flag & MS_NODEV && !dev) |
2938f7c8 SH |
1723 | required_flags |= MS_NODEV; |
1724 | if (sb.f_flag & MS_RDONLY) | |
1725 | required_flags |= MS_RDONLY; | |
1726 | if (sb.f_flag & MS_NOEXEC) | |
1727 | required_flags |= MS_NOEXEC; | |
1728 | DEBUG("(at remount) flags for %s was %lu, required extra flags are %lu", fsname, sb.f_flag, required_flags); | |
1729 | /* | |
1730 | * If this was a bind mount request, and required_flags | |
1731 | * does not have any flags which are not already in | |
1732 | * mountflags, then skip the remount | |
1733 | */ | |
1734 | if (!(mountflags & MS_REMOUNT)) { | |
7c5b6e7c | 1735 | if (!(required_flags & ~mountflags) && rqd_flags == 0) { |
2938f7c8 SH |
1736 | DEBUG("mountflags already was %lu, skipping remount", |
1737 | mountflags); | |
1738 | goto skipremount; | |
1739 | } | |
1740 | } | |
1741 | mountflags |= required_flags; | |
6fd5e769 | 1742 | } |
614305f3 | 1743 | #endif |
911324ef DL |
1744 | |
1745 | if (mount(fsname, target, fstype, | |
592fd47a | 1746 | mountflags | MS_REMOUNT, data) < 0) { |
1fc64d22 SG |
1747 | if (optional) { |
1748 | INFO("failed to mount '%s' on '%s' (optional): %s", | |
1749 | fsname, target, strerror(errno)); | |
1750 | return 0; | |
1751 | } | |
1752 | else { | |
1753 | SYSERROR("failed to mount '%s' on '%s'", | |
1754 | fsname, target); | |
1755 | return -1; | |
1756 | } | |
911324ef DL |
1757 | } |
1758 | } | |
1759 | ||
614305f3 | 1760 | #ifdef HAVE_STATVFS |
6fd5e769 | 1761 | skipremount: |
614305f3 | 1762 | #endif |
911324ef DL |
1763 | DEBUG("mounted '%s' on '%s', type '%s'", fsname, target, fstype); |
1764 | ||
1765 | return 0; | |
1766 | } | |
1767 | ||
4e4ca161 SH |
1768 | /* |
1769 | * Remove 'optional', 'create=dir', and 'create=file' from mntopt | |
1770 | */ | |
1771 | static void cull_mntent_opt(struct mntent *mntent) | |
1772 | { | |
1773 | int i; | |
1774 | char *p, *p2; | |
1775 | char *list[] = {"create=dir", | |
1776 | "create=file", | |
1777 | "optional", | |
1778 | NULL }; | |
1779 | ||
1780 | for (i=0; list[i]; i++) { | |
1781 | if (!(p = strstr(mntent->mnt_opts, list[i]))) | |
1782 | continue; | |
1783 | p2 = strchr(p, ','); | |
1784 | if (!p2) { | |
1785 | /* no more mntopts, so just chop it here */ | |
1786 | *p = '\0'; | |
1787 | continue; | |
1788 | } | |
1789 | memmove(p, p2+1, strlen(p2+1)+1); | |
1790 | } | |
1791 | } | |
1792 | ||
4d5b72a1 | 1793 | static int mount_entry_create_dir_file(const struct mntent *mntent, |
0a2dddd4 CB |
1794 | const char* path, const struct lxc_rootfs *rootfs, |
1795 | const char *lxc_name, const char *lxc_path) | |
0ad19a3f | 1796 | { |
4d5b72a1 | 1797 | char *pathdirname = NULL; |
608e3567 | 1798 | int ret = 0; |
34cfffb3 | 1799 | FILE *pathfile = NULL; |
911324ef | 1800 | |
6e46cc0d | 1801 | if (strncmp(mntent->mnt_type, "overlay", 7) == 0) { |
5c484f79 | 1802 | if (ovl_mkdir(mntent, rootfs, lxc_name, lxc_path) < 0) |
6e46cc0d CB |
1803 | return -1; |
1804 | } else if (strncmp(mntent->mnt_type, "aufs", 4) == 0) { | |
1d52bdf7 | 1805 | if (aufs_mkdir(mntent, rootfs, lxc_name, lxc_path) < 0) |
6e46cc0d CB |
1806 | return -1; |
1807 | } | |
1808 | ||
34cfffb3 | 1809 | if (hasmntopt(mntent, "create=dir")) { |
4d5b72a1 NC |
1810 | if (mkdir_p(path, 0755) < 0) { |
1811 | WARN("Failed to create mount target '%s'", path); | |
34cfffb3 SG |
1812 | ret = -1; |
1813 | } | |
1814 | } | |
1815 | ||
4d5b72a1 NC |
1816 | if (hasmntopt(mntent, "create=file") && access(path, F_OK)) { |
1817 | pathdirname = strdup(path); | |
34cfffb3 | 1818 | pathdirname = dirname(pathdirname); |
119126b6 SG |
1819 | if (mkdir_p(pathdirname, 0755) < 0) { |
1820 | WARN("Failed to create target directory"); | |
1821 | } | |
4d5b72a1 | 1822 | pathfile = fopen(path, "wb"); |
34cfffb3 | 1823 | if (!pathfile) { |
4d5b72a1 | 1824 | WARN("Failed to create mount target '%s'", path); |
34cfffb3 | 1825 | ret = -1; |
6e46cc0d | 1826 | } else { |
34cfffb3 | 1827 | fclose(pathfile); |
6e46cc0d | 1828 | } |
34cfffb3 | 1829 | } |
4d5b72a1 NC |
1830 | free(pathdirname); |
1831 | return ret; | |
1832 | } | |
1833 | ||
ec50007f CB |
1834 | /* rootfs, lxc_name, and lxc_path can be NULL when the container is created |
1835 | * without a rootfs. */ | |
db4aba38 | 1836 | static inline int mount_entry_on_generic(struct mntent *mntent, |
0a2dddd4 CB |
1837 | const char* path, const struct lxc_rootfs *rootfs, |
1838 | const char *lxc_name, const char *lxc_path) | |
4d5b72a1 NC |
1839 | { |
1840 | unsigned long mntflags; | |
1841 | char *mntdata; | |
1842 | int ret; | |
1843 | bool optional = hasmntopt(mntent, "optional") != NULL; | |
ae7a770e | 1844 | bool dev = hasmntopt(mntent, "dev") != NULL; |
4d5b72a1 | 1845 | |
ec50007f CB |
1846 | char *rootfs_path = NULL; |
1847 | if (rootfs && rootfs->path) | |
1848 | rootfs_path = rootfs->mount; | |
1849 | ||
0a2dddd4 | 1850 | ret = mount_entry_create_dir_file(mntent, path, rootfs, lxc_name, lxc_path); |
34cfffb3 | 1851 | |
608e3567 SH |
1852 | if (ret < 0) |
1853 | return optional ? 0 : -1; | |
1854 | ||
4e4ca161 SH |
1855 | cull_mntent_opt(mntent); |
1856 | ||
a17b1e65 SG |
1857 | if (parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata) < 0) { |
1858 | free(mntdata); | |
1859 | return -1; | |
1860 | } | |
1861 | ||
6e46cc0d | 1862 | ret = mount_entry(mntent->mnt_fsname, path, mntent->mnt_type, mntflags, |
ae7a770e | 1863 | mntdata, optional, dev, rootfs_path); |
68c152ef | 1864 | |
911324ef | 1865 | free(mntdata); |
911324ef DL |
1866 | return ret; |
1867 | } | |
1868 | ||
db4aba38 NC |
1869 | static inline int mount_entry_on_systemfs(struct mntent *mntent) |
1870 | { | |
1433c9f9 CB |
1871 | char path[MAXPATHLEN]; |
1872 | int ret; | |
1873 | ||
1874 | /* For containers created without a rootfs all mounts are treated as | |
1875 | * absolute paths starting at / on the host. */ | |
1876 | if (mntent->mnt_dir[0] != '/') | |
1877 | ret = snprintf(path, sizeof(path), "/%s", mntent->mnt_dir); | |
1878 | else | |
1879 | ret = snprintf(path, sizeof(path), "%s", mntent->mnt_dir); | |
1880 | ||
1881 | if (ret < 0 || ret >= sizeof(path)) { | |
1882 | ERROR("path name too long"); | |
1883 | return -1; | |
1884 | } | |
1885 | ||
1886 | return mount_entry_on_generic(mntent, path, NULL, NULL, NULL); | |
db4aba38 NC |
1887 | } |
1888 | ||
4e4ca161 | 1889 | static int mount_entry_on_absolute_rootfs(struct mntent *mntent, |
80a881b2 | 1890 | const struct lxc_rootfs *rootfs, |
0a2dddd4 CB |
1891 | const char *lxc_name, |
1892 | const char *lxc_path) | |
911324ef | 1893 | { |
013bd428 | 1894 | char *aux; |
59760f5d | 1895 | char path[MAXPATHLEN]; |
80a881b2 | 1896 | int r, ret = 0, offset; |
67e571de | 1897 | const char *lxcpath; |
0ad19a3f | 1898 | |
593e8478 | 1899 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
2a59a681 SH |
1900 | if (!lxcpath) { |
1901 | ERROR("Out of memory"); | |
1902 | return -1; | |
1903 | } | |
1904 | ||
80a881b2 | 1905 | /* if rootfs->path is a blockdev path, allow container fstab to |
2a59a681 SH |
1906 | * use $lxcpath/CN/rootfs as the target prefix */ |
1907 | r = snprintf(path, MAXPATHLEN, "%s/%s/rootfs", lxcpath, lxc_name); | |
80a881b2 SH |
1908 | if (r < 0 || r >= MAXPATHLEN) |
1909 | goto skipvarlib; | |
1910 | ||
1911 | aux = strstr(mntent->mnt_dir, path); | |
1912 | if (aux) { | |
1913 | offset = strlen(path); | |
1914 | goto skipabs; | |
1915 | } | |
1916 | ||
1917 | skipvarlib: | |
013bd428 DL |
1918 | aux = strstr(mntent->mnt_dir, rootfs->path); |
1919 | if (!aux) { | |
1920 | WARN("ignoring mount point '%s'", mntent->mnt_dir); | |
db4aba38 | 1921 | return ret; |
013bd428 | 1922 | } |
80a881b2 SH |
1923 | offset = strlen(rootfs->path); |
1924 | ||
1925 | skipabs: | |
013bd428 | 1926 | |
9ba8130c | 1927 | r = snprintf(path, MAXPATHLEN, "%s/%s", rootfs->mount, |
80a881b2 SH |
1928 | aux + offset); |
1929 | if (r < 0 || r >= MAXPATHLEN) { | |
1930 | WARN("pathnme too long for '%s'", mntent->mnt_dir); | |
a17b1e65 SG |
1931 | return -1; |
1932 | } | |
1933 | ||
0a2dddd4 | 1934 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef | 1935 | } |
d330fe7b | 1936 | |
4e4ca161 | 1937 | static int mount_entry_on_relative_rootfs(struct mntent *mntent, |
0a2dddd4 CB |
1938 | const struct lxc_rootfs *rootfs, |
1939 | const char *lxc_name, | |
1940 | const char *lxc_path) | |
911324ef DL |
1941 | { |
1942 | char path[MAXPATHLEN]; | |
911324ef | 1943 | int ret; |
d330fe7b | 1944 | |
34cfffb3 | 1945 | /* relative to root mount point */ |
6e46cc0d | 1946 | ret = snprintf(path, sizeof(path), "%s/%s", rootfs->mount, mntent->mnt_dir); |
1433c9f9 | 1947 | if (ret < 0 || ret >= sizeof(path)) { |
9ba8130c SH |
1948 | ERROR("path name too long"); |
1949 | return -1; | |
1950 | } | |
911324ef | 1951 | |
0a2dddd4 | 1952 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef DL |
1953 | } |
1954 | ||
80a881b2 | 1955 | static int mount_file_entries(const struct lxc_rootfs *rootfs, FILE *file, |
0a2dddd4 | 1956 | const char *lxc_name, const char *lxc_path) |
911324ef | 1957 | { |
aaf901be AM |
1958 | struct mntent mntent; |
1959 | char buf[4096]; | |
911324ef | 1960 | int ret = -1; |
e76b8764 | 1961 | |
aaf901be | 1962 | while (getmntent_r(file, &mntent, buf, sizeof(buf))) { |
e76b8764 | 1963 | |
911324ef | 1964 | if (!rootfs->path) { |
aaf901be | 1965 | if (mount_entry_on_systemfs(&mntent)) |
e76b8764 | 1966 | goto out; |
911324ef | 1967 | continue; |
e76b8764 CDC |
1968 | } |
1969 | ||
911324ef | 1970 | /* We have a separate root, mounts are relative to it */ |
aaf901be | 1971 | if (mntent.mnt_dir[0] != '/') { |
0a2dddd4 | 1972 | if (mount_entry_on_relative_rootfs(&mntent, rootfs, lxc_name, lxc_path)) |
911324ef DL |
1973 | goto out; |
1974 | continue; | |
1975 | } | |
cd54d859 | 1976 | |
0a2dddd4 | 1977 | if (mount_entry_on_absolute_rootfs(&mntent, rootfs, lxc_name, lxc_path)) |
911324ef | 1978 | goto out; |
0ad19a3f | 1979 | } |
cd54d859 | 1980 | |
0ad19a3f | 1981 | ret = 0; |
cd54d859 DL |
1982 | |
1983 | INFO("mount points have been setup"); | |
0ad19a3f | 1984 | out: |
e7938e9e MN |
1985 | return ret; |
1986 | } | |
1987 | ||
80a881b2 | 1988 | static int setup_mount(const struct lxc_rootfs *rootfs, const char *fstab, |
0a2dddd4 | 1989 | const char *lxc_name, const char *lxc_path) |
e7938e9e MN |
1990 | { |
1991 | FILE *file; | |
1992 | int ret; | |
1993 | ||
1994 | if (!fstab) | |
1995 | return 0; | |
1996 | ||
1997 | file = setmntent(fstab, "r"); | |
1998 | if (!file) { | |
1999 | SYSERROR("failed to use '%s'", fstab); | |
2000 | return -1; | |
2001 | } | |
2002 | ||
0a2dddd4 | 2003 | ret = mount_file_entries(rootfs, file, lxc_name, lxc_path); |
e7938e9e | 2004 | |
0ad19a3f | 2005 | endmntent(file); |
2006 | return ret; | |
2007 | } | |
2008 | ||
5ef5c9a3 | 2009 | FILE *make_anonymous_mount_file(struct lxc_list *mount) |
e7938e9e | 2010 | { |
5ef5c9a3 | 2011 | int ret; |
e7938e9e | 2012 | char *mount_entry; |
5ef5c9a3 CB |
2013 | struct lxc_list *iterator; |
2014 | FILE *file; | |
2015 | int fd = -1; | |
2016 | ||
2017 | fd = memfd_create("lxc_mount_file", MFD_CLOEXEC); | |
2018 | if (fd < 0) { | |
2019 | if (errno != ENOSYS) | |
2020 | return NULL; | |
2021 | file = tmpfile(); | |
2022 | } else { | |
2023 | file = fdopen(fd, "r+"); | |
2024 | } | |
e7938e9e | 2025 | |
e7938e9e | 2026 | if (!file) { |
fad6ef95 | 2027 | int saved_errno = errno; |
5ef5c9a3 CB |
2028 | if (fd != -1) |
2029 | close(fd); | |
fad6ef95 | 2030 | ERROR("Could not create mount entry file: %s.", strerror(saved_errno)); |
9fc7f8c0 | 2031 | return NULL; |
e7938e9e MN |
2032 | } |
2033 | ||
2034 | lxc_list_for_each(iterator, mount) { | |
2035 | mount_entry = iterator->elem; | |
5ef5c9a3 CB |
2036 | ret = fprintf(file, "%s\n", mount_entry); |
2037 | if (ret < strlen(mount_entry)) | |
2038 | WARN("Could not write mount entry to anonymous mount file."); | |
2039 | } | |
2040 | ||
2041 | if (fseek(file, 0, SEEK_SET) < 0) { | |
2042 | fclose(file); | |
2043 | return NULL; | |
e7938e9e MN |
2044 | } |
2045 | ||
9fc7f8c0 TA |
2046 | return file; |
2047 | } | |
2048 | ||
5ef5c9a3 CB |
2049 | static int setup_mount_entries(const struct lxc_rootfs *rootfs, |
2050 | struct lxc_list *mount, const char *lxc_name, | |
2051 | const char *lxc_path) | |
9fc7f8c0 TA |
2052 | { |
2053 | FILE *file; | |
2054 | int ret; | |
2055 | ||
5ef5c9a3 | 2056 | file = make_anonymous_mount_file(mount); |
9fc7f8c0 TA |
2057 | if (!file) |
2058 | return -1; | |
e7938e9e | 2059 | |
0a2dddd4 | 2060 | ret = mount_file_entries(rootfs, file, lxc_name, lxc_path); |
e7938e9e MN |
2061 | |
2062 | fclose(file); | |
2063 | return ret; | |
2064 | } | |
2065 | ||
bab88e68 CS |
2066 | static int parse_cap(const char *cap) |
2067 | { | |
2068 | char *ptr = NULL; | |
84760c11 | 2069 | size_t i; |
2070 | int capid = -1; | |
bab88e68 | 2071 | |
7035407c DE |
2072 | if (!strcmp(cap, "none")) |
2073 | return -2; | |
2074 | ||
bab88e68 CS |
2075 | for (i = 0; i < sizeof(caps_opt)/sizeof(caps_opt[0]); i++) { |
2076 | ||
2077 | if (strcmp(cap, caps_opt[i].name)) | |
2078 | continue; | |
2079 | ||
2080 | capid = caps_opt[i].value; | |
2081 | break; | |
2082 | } | |
2083 | ||
2084 | if (capid < 0) { | |
2085 | /* try to see if it's numeric, so the user may specify | |
2086 | * capabilities that the running kernel knows about but | |
2087 | * we don't */ | |
2088 | errno = 0; | |
2089 | capid = strtol(cap, &ptr, 10); | |
2090 | if (!ptr || *ptr != '\0' || errno != 0) | |
2091 | /* not a valid number */ | |
2092 | capid = -1; | |
2093 | else if (capid > lxc_caps_last_cap()) | |
2094 | /* we have a number but it's not a valid | |
2095 | * capability */ | |
2096 | capid = -1; | |
2097 | } | |
2098 | ||
2099 | return capid; | |
2100 | } | |
2101 | ||
0769b82a CS |
2102 | int in_caplist(int cap, struct lxc_list *caps) |
2103 | { | |
2104 | struct lxc_list *iterator; | |
2105 | int capid; | |
2106 | ||
2107 | lxc_list_for_each(iterator, caps) { | |
2108 | capid = parse_cap(iterator->elem); | |
2109 | if (capid == cap) | |
2110 | return 1; | |
2111 | } | |
2112 | ||
2113 | return 0; | |
2114 | } | |
2115 | ||
81810dd1 DL |
2116 | static int setup_caps(struct lxc_list *caps) |
2117 | { | |
2118 | struct lxc_list *iterator; | |
2119 | char *drop_entry; | |
bab88e68 | 2120 | int capid; |
81810dd1 DL |
2121 | |
2122 | lxc_list_for_each(iterator, caps) { | |
2123 | ||
2124 | drop_entry = iterator->elem; | |
2125 | ||
bab88e68 | 2126 | capid = parse_cap(drop_entry); |
d55bc1ad | 2127 | |
81810dd1 | 2128 | if (capid < 0) { |
1e11be34 DL |
2129 | ERROR("unknown capability %s", drop_entry); |
2130 | return -1; | |
81810dd1 DL |
2131 | } |
2132 | ||
2133 | DEBUG("drop capability '%s' (%d)", drop_entry, capid); | |
2134 | ||
2135 | if (prctl(PR_CAPBSET_DROP, capid, 0, 0, 0)) { | |
3ec1648d SH |
2136 | SYSERROR("failed to remove %s capability", drop_entry); |
2137 | return -1; | |
2138 | } | |
81810dd1 DL |
2139 | |
2140 | } | |
2141 | ||
1fb86a7c SH |
2142 | DEBUG("capabilities have been setup"); |
2143 | ||
2144 | return 0; | |
2145 | } | |
2146 | ||
2147 | static int dropcaps_except(struct lxc_list *caps) | |
2148 | { | |
2149 | struct lxc_list *iterator; | |
2150 | char *keep_entry; | |
1fb86a7c SH |
2151 | int i, capid; |
2152 | int numcaps = lxc_caps_last_cap() + 1; | |
959aee9c | 2153 | INFO("found %d capabilities", numcaps); |
1fb86a7c | 2154 | |
2caf9a97 SH |
2155 | if (numcaps <= 0 || numcaps > 200) |
2156 | return -1; | |
2157 | ||
1fb86a7c SH |
2158 | // caplist[i] is 1 if we keep capability i |
2159 | int *caplist = alloca(numcaps * sizeof(int)); | |
2160 | memset(caplist, 0, numcaps * sizeof(int)); | |
2161 | ||
2162 | lxc_list_for_each(iterator, caps) { | |
2163 | ||
2164 | keep_entry = iterator->elem; | |
2165 | ||
bab88e68 | 2166 | capid = parse_cap(keep_entry); |
1fb86a7c | 2167 | |
7035407c DE |
2168 | if (capid == -2) |
2169 | continue; | |
2170 | ||
1fb86a7c SH |
2171 | if (capid < 0) { |
2172 | ERROR("unknown capability %s", keep_entry); | |
2173 | return -1; | |
2174 | } | |
2175 | ||
8255688a | 2176 | DEBUG("keep capability '%s' (%d)", keep_entry, capid); |
1fb86a7c SH |
2177 | |
2178 | caplist[capid] = 1; | |
2179 | } | |
2180 | for (i=0; i<numcaps; i++) { | |
2181 | if (caplist[i]) | |
2182 | continue; | |
2183 | if (prctl(PR_CAPBSET_DROP, i, 0, 0, 0)) { | |
3ec1648d SH |
2184 | SYSERROR("failed to remove capability %d", i); |
2185 | return -1; | |
2186 | } | |
1fb86a7c SH |
2187 | } |
2188 | ||
2189 | DEBUG("capabilities have been setup"); | |
81810dd1 DL |
2190 | |
2191 | return 0; | |
2192 | } | |
2193 | ||
0ad19a3f | 2194 | static int setup_hw_addr(char *hwaddr, const char *ifname) |
2195 | { | |
2196 | struct sockaddr sockaddr; | |
2197 | struct ifreq ifr; | |
fad6ef95 | 2198 | int ret, fd, saved_errno; |
0ad19a3f | 2199 | |
3cfc0f3a MN |
2200 | ret = lxc_convert_mac(hwaddr, &sockaddr); |
2201 | if (ret) { | |
2202 | ERROR("mac address '%s' conversion failed : %s", | |
2203 | hwaddr, strerror(-ret)); | |
0ad19a3f | 2204 | return -1; |
2205 | } | |
2206 | ||
2207 | memcpy(ifr.ifr_name, ifname, IFNAMSIZ); | |
5da6aa8c | 2208 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
0ad19a3f | 2209 | memcpy((char *) &ifr.ifr_hwaddr, (char *) &sockaddr, sizeof(sockaddr)); |
2210 | ||
2211 | fd = socket(AF_INET, SOCK_DGRAM, 0); | |
2212 | if (fd < 0) { | |
3ab87b66 | 2213 | ERROR("socket failure : %s", strerror(errno)); |
0ad19a3f | 2214 | return -1; |
2215 | } | |
2216 | ||
2217 | ret = ioctl(fd, SIOCSIFHWADDR, &ifr); | |
fad6ef95 | 2218 | saved_errno = errno; |
0ad19a3f | 2219 | close(fd); |
2220 | if (ret) | |
fad6ef95 | 2221 | ERROR("ioctl failure : %s", strerror(saved_errno)); |
0ad19a3f | 2222 | |
5da6aa8c | 2223 | DEBUG("mac address '%s' on '%s' has been setup", hwaddr, ifr.ifr_name); |
cd54d859 | 2224 | |
0ad19a3f | 2225 | return ret; |
2226 | } | |
2227 | ||
82d5ae15 | 2228 | static int setup_ipv4_addr(struct lxc_list *ip, int ifindex) |
0ad19a3f | 2229 | { |
82d5ae15 DL |
2230 | struct lxc_list *iterator; |
2231 | struct lxc_inetdev *inetdev; | |
3cfc0f3a | 2232 | int err; |
0ad19a3f | 2233 | |
82d5ae15 DL |
2234 | lxc_list_for_each(iterator, ip) { |
2235 | ||
2236 | inetdev = iterator->elem; | |
2237 | ||
0093bb8c DL |
2238 | err = lxc_ipv4_addr_add(ifindex, &inetdev->addr, |
2239 | &inetdev->bcast, inetdev->prefix); | |
3cfc0f3a MN |
2240 | if (err) { |
2241 | ERROR("failed to setup_ipv4_addr ifindex %d : %s", | |
2242 | ifindex, strerror(-err)); | |
82d5ae15 DL |
2243 | return -1; |
2244 | } | |
2245 | } | |
2246 | ||
2247 | return 0; | |
0ad19a3f | 2248 | } |
2249 | ||
82d5ae15 | 2250 | static int setup_ipv6_addr(struct lxc_list *ip, int ifindex) |
0ad19a3f | 2251 | { |
82d5ae15 | 2252 | struct lxc_list *iterator; |
7fa9074f | 2253 | struct lxc_inet6dev *inet6dev; |
3cfc0f3a | 2254 | int err; |
0ad19a3f | 2255 | |
82d5ae15 DL |
2256 | lxc_list_for_each(iterator, ip) { |
2257 | ||
2258 | inet6dev = iterator->elem; | |
2259 | ||
b3df193c | 2260 | err = lxc_ipv6_addr_add(ifindex, &inet6dev->addr, |
0093bb8c DL |
2261 | &inet6dev->mcast, &inet6dev->acast, |
2262 | inet6dev->prefix); | |
3cfc0f3a MN |
2263 | if (err) { |
2264 | ERROR("failed to setup_ipv6_addr ifindex %d : %s", | |
2265 | ifindex, strerror(-err)); | |
82d5ae15 | 2266 | return -1; |
3cfc0f3a | 2267 | } |
82d5ae15 DL |
2268 | } |
2269 | ||
2270 | return 0; | |
0ad19a3f | 2271 | } |
2272 | ||
82d5ae15 | 2273 | static int setup_netdev(struct lxc_netdev *netdev) |
0ad19a3f | 2274 | { |
0ad19a3f | 2275 | char ifname[IFNAMSIZ]; |
0ad19a3f | 2276 | char *current_ifname = ifname; |
3cfc0f3a | 2277 | int err; |
0ad19a3f | 2278 | |
82d5ae15 DL |
2279 | /* empty network namespace */ |
2280 | if (!netdev->ifindex) { | |
b0efbac4 | 2281 | if (netdev->flags & IFF_UP) { |
d472214b | 2282 | err = lxc_netdev_up("lo"); |
3cfc0f3a MN |
2283 | if (err) { |
2284 | ERROR("failed to set the loopback up : %s", | |
2285 | strerror(-err)); | |
82d5ae15 DL |
2286 | return -1; |
2287 | } | |
82d5ae15 | 2288 | } |
40790553 SH |
2289 | if (netdev->type != LXC_NET_VETH) |
2290 | return 0; | |
2291 | netdev->ifindex = if_nametoindex(netdev->name); | |
0ad19a3f | 2292 | } |
13954cce | 2293 | |
b466dc33 | 2294 | /* get the new ifindex in case of physical netdev */ |
40790553 | 2295 | if (netdev->type == LXC_NET_PHYS) { |
b466dc33 BP |
2296 | if (!(netdev->ifindex = if_nametoindex(netdev->link))) { |
2297 | ERROR("failed to get ifindex for %s", | |
2298 | netdev->link); | |
2299 | return -1; | |
2300 | } | |
40790553 | 2301 | } |
b466dc33 | 2302 | |
82d5ae15 DL |
2303 | /* retrieve the name of the interface */ |
2304 | if (!if_indextoname(netdev->ifindex, current_ifname)) { | |
36eb9bde | 2305 | ERROR("no interface corresponding to index '%d'", |
82d5ae15 | 2306 | netdev->ifindex); |
0ad19a3f | 2307 | return -1; |
2308 | } | |
13954cce | 2309 | |
018ef520 | 2310 | /* default: let the system to choose one interface name */ |
9d083402 | 2311 | if (!netdev->name) |
fb6d9b2f DL |
2312 | netdev->name = netdev->type == LXC_NET_PHYS ? |
2313 | netdev->link : "eth%d"; | |
018ef520 | 2314 | |
82d5ae15 | 2315 | /* rename the interface name */ |
40790553 SH |
2316 | if (strcmp(ifname, netdev->name) != 0) { |
2317 | err = lxc_netdev_rename_by_name(ifname, netdev->name); | |
2318 | if (err) { | |
2319 | ERROR("failed to rename %s->%s : %s", ifname, netdev->name, | |
2320 | strerror(-err)); | |
2321 | return -1; | |
2322 | } | |
018ef520 DL |
2323 | } |
2324 | ||
2325 | /* Re-read the name of the interface because its name has changed | |
2326 | * and would be automatically allocated by the system | |
2327 | */ | |
82d5ae15 | 2328 | if (!if_indextoname(netdev->ifindex, current_ifname)) { |
018ef520 | 2329 | ERROR("no interface corresponding to index '%d'", |
82d5ae15 | 2330 | netdev->ifindex); |
018ef520 | 2331 | return -1; |
0ad19a3f | 2332 | } |
2333 | ||
82d5ae15 DL |
2334 | /* set a mac address */ |
2335 | if (netdev->hwaddr) { | |
2336 | if (setup_hw_addr(netdev->hwaddr, current_ifname)) { | |
36eb9bde | 2337 | ERROR("failed to setup hw address for '%s'", |
82d5ae15 | 2338 | current_ifname); |
0ad19a3f | 2339 | return -1; |
2340 | } | |
2341 | } | |
2342 | ||
82d5ae15 DL |
2343 | /* setup ipv4 addresses on the interface */ |
2344 | if (setup_ipv4_addr(&netdev->ipv4, netdev->ifindex)) { | |
36eb9bde | 2345 | ERROR("failed to setup ip addresses for '%s'", |
0ad19a3f | 2346 | ifname); |
2347 | return -1; | |
2348 | } | |
2349 | ||
82d5ae15 DL |
2350 | /* setup ipv6 addresses on the interface */ |
2351 | if (setup_ipv6_addr(&netdev->ipv6, netdev->ifindex)) { | |
36eb9bde | 2352 | ERROR("failed to setup ipv6 addresses for '%s'", |
0ad19a3f | 2353 | ifname); |
2354 | return -1; | |
2355 | } | |
2356 | ||
82d5ae15 | 2357 | /* set the network device up */ |
b0efbac4 | 2358 | if (netdev->flags & IFF_UP) { |
3cfc0f3a MN |
2359 | int err; |
2360 | ||
d472214b | 2361 | err = lxc_netdev_up(current_ifname); |
3cfc0f3a MN |
2362 | if (err) { |
2363 | ERROR("failed to set '%s' up : %s", current_ifname, | |
2364 | strerror(-err)); | |
0ad19a3f | 2365 | return -1; |
2366 | } | |
2367 | ||
2368 | /* the network is up, make the loopback up too */ | |
d472214b | 2369 | err = lxc_netdev_up("lo"); |
3cfc0f3a MN |
2370 | if (err) { |
2371 | ERROR("failed to set the loopback up : %s", | |
2372 | strerror(-err)); | |
0ad19a3f | 2373 | return -1; |
2374 | } | |
2375 | } | |
2376 | ||
f8fee0e2 MK |
2377 | /* We can only set up the default routes after bringing |
2378 | * up the interface, sine bringing up the interface adds | |
2379 | * the link-local routes and we can't add a default | |
2380 | * route if the gateway is not reachable. */ | |
2381 | ||
2382 | /* setup ipv4 gateway on the interface */ | |
2383 | if (netdev->ipv4_gateway) { | |
2384 | if (!(netdev->flags & IFF_UP)) { | |
2385 | ERROR("Cannot add ipv4 gateway for %s when not bringing up the interface", ifname); | |
2386 | return -1; | |
2387 | } | |
2388 | ||
2389 | if (lxc_list_empty(&netdev->ipv4)) { | |
2390 | ERROR("Cannot add ipv4 gateway for %s when not assigning an address", ifname); | |
2391 | return -1; | |
2392 | } | |
2393 | ||
2394 | err = lxc_ipv4_gateway_add(netdev->ifindex, netdev->ipv4_gateway); | |
2395 | if (err) { | |
fc739df5 SG |
2396 | err = lxc_ipv4_dest_add(netdev->ifindex, netdev->ipv4_gateway); |
2397 | if (err) { | |
2398 | ERROR("failed to add ipv4 dest for '%s': %s", | |
2399 | ifname, strerror(-err)); | |
2400 | } | |
2401 | ||
2402 | err = lxc_ipv4_gateway_add(netdev->ifindex, netdev->ipv4_gateway); | |
2403 | if (err) { | |
2404 | ERROR("failed to setup ipv4 gateway for '%s': %s", | |
2405 | ifname, strerror(-err)); | |
2406 | if (netdev->ipv4_gateway_auto) { | |
2407 | char buf[INET_ADDRSTRLEN]; | |
2408 | inet_ntop(AF_INET, netdev->ipv4_gateway, buf, sizeof(buf)); | |
2409 | ERROR("tried to set autodetected ipv4 gateway '%s'", buf); | |
2410 | } | |
2411 | return -1; | |
19a26f82 | 2412 | } |
f8fee0e2 MK |
2413 | } |
2414 | } | |
2415 | ||
2416 | /* setup ipv6 gateway on the interface */ | |
2417 | if (netdev->ipv6_gateway) { | |
2418 | if (!(netdev->flags & IFF_UP)) { | |
2419 | ERROR("Cannot add ipv6 gateway for %s when not bringing up the interface", ifname); | |
2420 | return -1; | |
2421 | } | |
2422 | ||
2423 | if (lxc_list_empty(&netdev->ipv6) && !IN6_IS_ADDR_LINKLOCAL(netdev->ipv6_gateway)) { | |
2424 | ERROR("Cannot add ipv6 gateway for %s when not assigning an address", ifname); | |
2425 | return -1; | |
2426 | } | |
2427 | ||
2428 | err = lxc_ipv6_gateway_add(netdev->ifindex, netdev->ipv6_gateway); | |
2429 | if (err) { | |
fc739df5 SG |
2430 | err = lxc_ipv6_dest_add(netdev->ifindex, netdev->ipv6_gateway); |
2431 | if (err) { | |
2432 | ERROR("failed to add ipv6 dest for '%s': %s", | |
f8fee0e2 | 2433 | ifname, strerror(-err)); |
19a26f82 | 2434 | } |
fc739df5 SG |
2435 | |
2436 | err = lxc_ipv6_gateway_add(netdev->ifindex, netdev->ipv6_gateway); | |
2437 | if (err) { | |
2438 | ERROR("failed to setup ipv6 gateway for '%s': %s", | |
2439 | ifname, strerror(-err)); | |
2440 | if (netdev->ipv6_gateway_auto) { | |
2441 | char buf[INET6_ADDRSTRLEN]; | |
2442 | inet_ntop(AF_INET6, netdev->ipv6_gateway, buf, sizeof(buf)); | |
2443 | ERROR("tried to set autodetected ipv6 gateway '%s'", buf); | |
2444 | } | |
2445 | return -1; | |
2446 | } | |
f8fee0e2 MK |
2447 | } |
2448 | } | |
2449 | ||
cd54d859 DL |
2450 | DEBUG("'%s' has been setup", current_ifname); |
2451 | ||
0ad19a3f | 2452 | return 0; |
2453 | } | |
2454 | ||
5f4535a3 | 2455 | static int setup_network(struct lxc_list *network) |
0ad19a3f | 2456 | { |
82d5ae15 | 2457 | struct lxc_list *iterator; |
82d5ae15 | 2458 | struct lxc_netdev *netdev; |
0ad19a3f | 2459 | |
5f4535a3 | 2460 | lxc_list_for_each(iterator, network) { |
cd54d859 | 2461 | |
5f4535a3 | 2462 | netdev = iterator->elem; |
82d5ae15 DL |
2463 | |
2464 | if (setup_netdev(netdev)) { | |
2465 | ERROR("failed to setup netdev"); | |
2466 | return -1; | |
2467 | } | |
2468 | } | |
cd54d859 | 2469 | |
5f4535a3 DL |
2470 | if (!lxc_list_empty(network)) |
2471 | INFO("network has been setup"); | |
cd54d859 DL |
2472 | |
2473 | return 0; | |
0ad19a3f | 2474 | } |
2475 | ||
2af6bd1b | 2476 | /* try to move physical nics to the init netns */ |
5610055a | 2477 | void lxc_restore_phys_nics_to_netns(int netnsfd, struct lxc_conf *conf) |
2af6bd1b | 2478 | { |
64d2fcb5 | 2479 | int i, oldfd; |
4ec31c52 | 2480 | char ifname[IFNAMSIZ]; |
2af6bd1b | 2481 | |
5610055a | 2482 | if (netnsfd < 0 || conf->num_savednics == 0) |
2af6bd1b SH |
2483 | return; |
2484 | ||
64d2fcb5 | 2485 | INFO("Running to reset %d nic names.", conf->num_savednics); |
5610055a | 2486 | |
64d2fcb5 CB |
2487 | oldfd = lxc_preserve_ns(getpid(), "net"); |
2488 | if (oldfd < 0) { | |
2489 | SYSERROR("Failed to open monitor netns fd."); | |
2af6bd1b SH |
2490 | return; |
2491 | } | |
64d2fcb5 | 2492 | |
2af6bd1b SH |
2493 | if (setns(netnsfd, 0) != 0) { |
2494 | SYSERROR("Failed to enter container netns to reset nics"); | |
2495 | close(oldfd); | |
2496 | return; | |
2497 | } | |
2498 | for (i=0; i<conf->num_savednics; i++) { | |
2499 | struct saved_nic *s = &conf->saved_nics[i]; | |
f2e206ff | 2500 | /* retrieve the name of the interface */ |
2501 | if (!if_indextoname(s->ifindex, ifname)) { | |
2502 | WARN("no interface corresponding to index '%d'", s->ifindex); | |
2503 | continue; | |
2504 | } | |
5610055a | 2505 | if (lxc_netdev_move_by_name(ifname, 1, s->orig_name)) |
f2e206ff | 2506 | WARN("Error moving nic name:%s back to host netns", ifname); |
5610055a | 2507 | free(s->orig_name); |
2af6bd1b | 2508 | } |
5610055a WB |
2509 | conf->num_savednics = 0; |
2510 | ||
2af6bd1b SH |
2511 | if (setns(oldfd, 0) != 0) |
2512 | SYSERROR("Failed to re-enter monitor's netns"); | |
2513 | close(oldfd); | |
2514 | } | |
2515 | ||
ae9242c8 SH |
2516 | static char *default_rootfs_mount = LXCROOTFSMOUNT; |
2517 | ||
7b379ab3 | 2518 | struct lxc_conf *lxc_conf_init(void) |
089cd8b8 | 2519 | { |
7b379ab3 | 2520 | struct lxc_conf *new; |
26ddeedd | 2521 | int i; |
7b379ab3 MN |
2522 | |
2523 | new = malloc(sizeof(*new)); | |
2524 | if (!new) { | |
2525 | ERROR("lxc_conf_init : %m"); | |
2526 | return NULL; | |
2527 | } | |
2528 | memset(new, 0, sizeof(*new)); | |
2529 | ||
b40a606e | 2530 | new->loglevel = LXC_LOG_PRIORITY_NOTSET; |
cccc74b5 | 2531 | new->personality = -1; |
124fa0a8 | 2532 | new->autodev = 1; |
596a818d DE |
2533 | new->console.log_path = NULL; |
2534 | new->console.log_fd = -1; | |
28a4b0e5 | 2535 | new->console.path = NULL; |
63376d7d | 2536 | new->console.peer = -1; |
b5159817 DE |
2537 | new->console.peerpty.busy = -1; |
2538 | new->console.peerpty.master = -1; | |
2539 | new->console.peerpty.slave = -1; | |
63376d7d DL |
2540 | new->console.master = -1; |
2541 | new->console.slave = -1; | |
2542 | new->console.name[0] = '\0'; | |
d2e30e99 | 2543 | new->maincmd_fd = -1; |
76a26f55 | 2544 | new->nbd_idx = -1; |
54c30e29 | 2545 | new->rootfs.mount = strdup(default_rootfs_mount); |
53f3f048 SH |
2546 | if (!new->rootfs.mount) { |
2547 | ERROR("lxc_conf_init : %m"); | |
2548 | free(new); | |
2549 | return NULL; | |
2550 | } | |
d89de239 | 2551 | new->kmsg = 0; |
858377e4 | 2552 | new->logfd = -1; |
7b379ab3 MN |
2553 | lxc_list_init(&new->cgroup); |
2554 | lxc_list_init(&new->network); | |
2555 | lxc_list_init(&new->mount_list); | |
81810dd1 | 2556 | lxc_list_init(&new->caps); |
1fb86a7c | 2557 | lxc_list_init(&new->keepcaps); |
f6d3e3e4 | 2558 | lxc_list_init(&new->id_map); |
f979ac15 | 2559 | lxc_list_init(&new->includes); |
4184c3e1 | 2560 | lxc_list_init(&new->aliens); |
7c661726 | 2561 | lxc_list_init(&new->environment); |
26ddeedd SH |
2562 | for (i=0; i<NUM_LXC_HOOKS; i++) |
2563 | lxc_list_init(&new->hooks[i]); | |
ee1e7aa0 | 2564 | lxc_list_init(&new->groups); |
fe4de9a6 DE |
2565 | new->lsm_aa_profile = NULL; |
2566 | new->lsm_se_context = NULL; | |
5112cd70 | 2567 | new->tmp_umount_proc = 0; |
7b379ab3 | 2568 | |
9f30a190 MM |
2569 | for (i = 0; i < LXC_NS_MAX; i++) |
2570 | new->inherit_ns_fd[i] = -1; | |
2571 | ||
72bb04e4 PT |
2572 | /* if running in a new user namespace, init and COMMAND |
2573 | * default to running as UID/GID 0 when using lxc-execute */ | |
2574 | new->init_uid = 0; | |
2575 | new->init_gid = 0; | |
2576 | ||
7b379ab3 | 2577 | return new; |
089cd8b8 DL |
2578 | } |
2579 | ||
a589434e | 2580 | static int instantiate_veth(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2581 | { |
8634bc19 | 2582 | char veth1buf[IFNAMSIZ], *veth1; |
0e391e57 | 2583 | char veth2buf[IFNAMSIZ], *veth2; |
b7b2fde4 CB |
2584 | int bridge_index, err; |
2585 | unsigned int mtu = 0; | |
13954cce | 2586 | |
8bee8851 | 2587 | if (netdev->priv.veth_attr.pair) { |
e892973e | 2588 | veth1 = netdev->priv.veth_attr.pair; |
8bee8851 WB |
2589 | if (handler->conf->reboot) |
2590 | lxc_netdev_delete_by_name(veth1); | |
2591 | } else { | |
9ba8130c SH |
2592 | err = snprintf(veth1buf, sizeof(veth1buf), "vethXXXXXX"); |
2593 | if (err >= sizeof(veth1buf)) { /* can't *really* happen, but... */ | |
2594 | ERROR("veth1 name too long"); | |
2595 | return -1; | |
2596 | } | |
a0265685 | 2597 | veth1 = lxc_mkifname(veth1buf); |
ad40563e ÇO |
2598 | if (!veth1) { |
2599 | ERROR("failed to allocate a temporary name"); | |
2600 | return -1; | |
2601 | } | |
74a2b586 JK |
2602 | /* store away for deconf */ |
2603 | memcpy(netdev->priv.veth_attr.veth1, veth1, IFNAMSIZ); | |
8634bc19 | 2604 | } |
82d5ae15 | 2605 | |
0e391e57 | 2606 | snprintf(veth2buf, sizeof(veth2buf), "vethXXXXXX"); |
a0265685 | 2607 | veth2 = lxc_mkifname(veth2buf); |
ad40563e | 2608 | if (!veth2) { |
82d5ae15 | 2609 | ERROR("failed to allocate a temporary name"); |
ad40563e | 2610 | goto out_delete; |
0ad19a3f | 2611 | } |
2612 | ||
3cfc0f3a MN |
2613 | err = lxc_veth_create(veth1, veth2); |
2614 | if (err) { | |
2e2d6a7b | 2615 | ERROR("failed to create veth pair (%s and %s): %s", veth1, veth2, |
3cfc0f3a | 2616 | strerror(-err)); |
ad40563e | 2617 | goto out_delete; |
0ad19a3f | 2618 | } |
13954cce | 2619 | |
49684c0b CS |
2620 | /* changing the high byte of the mac address to 0xfe, the bridge interface |
2621 | * will always keep the host's mac address and not take the mac address | |
2622 | * of a container */ | |
2623 | err = setup_private_host_hw_addr(veth1); | |
2624 | if (err) { | |
2e2d6a7b | 2625 | ERROR("failed to change mac address of host interface '%s': %s", |
49684c0b CS |
2626 | veth1, strerror(-err)); |
2627 | goto out_delete; | |
2628 | } | |
2629 | ||
af651aa9 SN |
2630 | netdev->ifindex = if_nametoindex(veth2); |
2631 | if (!netdev->ifindex) { | |
2632 | ERROR("failed to retrieve the index for %s", veth2); | |
2633 | goto out_delete; | |
2634 | } | |
2635 | ||
82d5ae15 | 2636 | if (netdev->mtu) { |
b7b2fde4 CB |
2637 | if (lxc_safe_uint(netdev->mtu, &mtu) < 0) |
2638 | WARN("Failed to parse mtu from."); | |
2639 | else | |
2640 | INFO("Retrieved mtu %d", mtu); | |
e54864d3 | 2641 | } else if (netdev->link) { |
e9280f65 | 2642 | bridge_index = if_nametoindex(netdev->link); |
729e8bf6 CB |
2643 | if (bridge_index) { |
2644 | mtu = netdev_get_mtu(bridge_index); | |
2645 | INFO("Retrieved mtu %d from %s", mtu, netdev->link); | |
2646 | } else { | |
2647 | mtu = netdev_get_mtu(netdev->ifindex); | |
2648 | INFO("Retrieved mtu %d from %s", mtu, veth2); | |
2649 | } | |
e54864d3 NC |
2650 | } |
2651 | ||
2652 | if (mtu) { | |
2653 | err = lxc_netdev_set_mtu(veth1, mtu); | |
3cfc0f3a | 2654 | if (!err) |
e54864d3 | 2655 | err = lxc_netdev_set_mtu(veth2, mtu); |
3cfc0f3a | 2656 | if (err) { |
e54864d3 NC |
2657 | ERROR("failed to set mtu '%i' for veth pair (%s and %s): %s", |
2658 | mtu, veth1, veth2, strerror(-err)); | |
eb14c10a | 2659 | goto out_delete; |
75d09f83 DL |
2660 | } |
2661 | } | |
2662 | ||
3cfc0f3a | 2663 | if (netdev->link) { |
c43cbc04 | 2664 | err = lxc_bridge_attach(handler->lxcpath, handler->name, netdev->link, veth1); |
3cfc0f3a | 2665 | if (err) { |
2e2d6a7b | 2666 | ERROR("failed to attach '%s' to the bridge '%s': %s", |
3cfc0f3a MN |
2667 | veth1, netdev->link, strerror(-err)); |
2668 | goto out_delete; | |
2669 | } | |
738d0deb | 2670 | INFO("Attached '%s': to the bridge '%s': ", veth1, netdev->link); |
eb14c10a DL |
2671 | } |
2672 | ||
d472214b | 2673 | err = lxc_netdev_up(veth1); |
6e35af2e DL |
2674 | if (err) { |
2675 | ERROR("failed to set %s up : %s", veth1, strerror(-err)); | |
2676 | goto out_delete; | |
0ad19a3f | 2677 | } |
2678 | ||
e3b4c4c4 | 2679 | if (netdev->upscript) { |
751d9dcd DL |
2680 | err = run_script(handler->name, "net", netdev->upscript, "up", |
2681 | "veth", veth1, (char*) NULL); | |
2682 | if (err) | |
e3b4c4c4 | 2683 | goto out_delete; |
e3b4c4c4 ST |
2684 | } |
2685 | ||
a589434e | 2686 | DEBUG("instantiated veth '%s/%s', index is '%d'", |
82d5ae15 DL |
2687 | veth1, veth2, netdev->ifindex); |
2688 | ||
6ab9ab6d | 2689 | return 0; |
eb14c10a DL |
2690 | |
2691 | out_delete: | |
b84f58b9 | 2692 | lxc_netdev_delete_by_name(veth1); |
f10fad2f | 2693 | if (!netdev->priv.veth_attr.pair) |
ad40563e | 2694 | free(veth1); |
f10fad2f | 2695 | free(veth2); |
6ab9ab6d | 2696 | return -1; |
13954cce | 2697 | } |
d957ae2d | 2698 | |
74a2b586 JK |
2699 | static int shutdown_veth(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2700 | { | |
2701 | char *veth1; | |
2702 | int err; | |
2703 | ||
2704 | if (netdev->priv.veth_attr.pair) | |
2705 | veth1 = netdev->priv.veth_attr.pair; | |
2706 | else | |
2707 | veth1 = netdev->priv.veth_attr.veth1; | |
2708 | ||
2709 | if (netdev->downscript) { | |
2710 | err = run_script(handler->name, "net", netdev->downscript, | |
2711 | "down", "veth", veth1, (char*) NULL); | |
2712 | if (err) | |
2713 | return -1; | |
2714 | } | |
2715 | return 0; | |
2716 | } | |
2717 | ||
a589434e | 2718 | static int instantiate_macvlan(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2719 | { |
0e391e57 | 2720 | char peerbuf[IFNAMSIZ], *peer; |
3cfc0f3a | 2721 | int err; |
d957ae2d MT |
2722 | |
2723 | if (!netdev->link) { | |
2724 | ERROR("no link specified for macvlan netdev"); | |
2725 | return -1; | |
2726 | } | |
13954cce | 2727 | |
9ba8130c SH |
2728 | err = snprintf(peerbuf, sizeof(peerbuf), "mcXXXXXX"); |
2729 | if (err >= sizeof(peerbuf)) | |
2730 | return -1; | |
82d5ae15 | 2731 | |
a0265685 | 2732 | peer = lxc_mkifname(peerbuf); |
ad40563e | 2733 | if (!peer) { |
82d5ae15 DL |
2734 | ERROR("failed to make a temporary name"); |
2735 | return -1; | |
0ad19a3f | 2736 | } |
2737 | ||
3cfc0f3a MN |
2738 | err = lxc_macvlan_create(netdev->link, peer, |
2739 | netdev->priv.macvlan_attr.mode); | |
2740 | if (err) { | |
2741 | ERROR("failed to create macvlan interface '%s' on '%s' : %s", | |
2742 | peer, netdev->link, strerror(-err)); | |
ad40563e | 2743 | goto out; |
0ad19a3f | 2744 | } |
2745 | ||
82d5ae15 DL |
2746 | netdev->ifindex = if_nametoindex(peer); |
2747 | if (!netdev->ifindex) { | |
36eb9bde | 2748 | ERROR("failed to retrieve the index for %s", peer); |
ad40563e | 2749 | goto out; |
22ebac19 | 2750 | } |
2751 | ||
e3b4c4c4 | 2752 | if (netdev->upscript) { |
751d9dcd DL |
2753 | err = run_script(handler->name, "net", netdev->upscript, "up", |
2754 | "macvlan", netdev->link, (char*) NULL); | |
2755 | if (err) | |
ad40563e | 2756 | goto out; |
e3b4c4c4 ST |
2757 | } |
2758 | ||
a589434e | 2759 | DEBUG("instantiated macvlan '%s', index is '%d' and mode '%d'", |
e892973e | 2760 | peer, netdev->ifindex, netdev->priv.macvlan_attr.mode); |
0ad19a3f | 2761 | |
d957ae2d | 2762 | return 0; |
ad40563e ÇO |
2763 | out: |
2764 | lxc_netdev_delete_by_name(peer); | |
2765 | free(peer); | |
2766 | return -1; | |
0ad19a3f | 2767 | } |
2768 | ||
74a2b586 JK |
2769 | static int shutdown_macvlan(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2770 | { | |
2771 | int err; | |
2772 | ||
2773 | if (netdev->downscript) { | |
2774 | err = run_script(handler->name, "net", netdev->downscript, | |
2775 | "down", "macvlan", netdev->link, | |
2776 | (char*) NULL); | |
2777 | if (err) | |
2778 | return -1; | |
2779 | } | |
2780 | return 0; | |
2781 | } | |
2782 | ||
a589434e JN |
2783 | /* XXX: merge with instantiate_macvlan */ |
2784 | static int instantiate_vlan(struct lxc_handler *handler, struct lxc_netdev *netdev) | |
26c39028 JHS |
2785 | { |
2786 | char peer[IFNAMSIZ]; | |
3cfc0f3a | 2787 | int err; |
82f58d03 | 2788 | static uint16_t vlan_cntr = 0; |
b7b2fde4 | 2789 | unsigned int mtu = 0; |
26c39028 JHS |
2790 | |
2791 | if (!netdev->link) { | |
2792 | ERROR("no link specified for vlan netdev"); | |
2793 | return -1; | |
2794 | } | |
2795 | ||
82f58d03 | 2796 | err = snprintf(peer, sizeof(peer), "vlan%d-%d", netdev->priv.vlan_attr.vid, vlan_cntr++); |
9ba8130c SH |
2797 | if (err >= sizeof(peer)) { |
2798 | ERROR("peer name too long"); | |
2799 | return -1; | |
2800 | } | |
26c39028 | 2801 | |
3cfc0f3a MN |
2802 | err = lxc_vlan_create(netdev->link, peer, netdev->priv.vlan_attr.vid); |
2803 | if (err) { | |
2804 | ERROR("failed to create vlan interface '%s' on '%s' : %s", | |
2805 | peer, netdev->link, strerror(-err)); | |
26c39028 JHS |
2806 | return -1; |
2807 | } | |
2808 | ||
2809 | netdev->ifindex = if_nametoindex(peer); | |
2810 | if (!netdev->ifindex) { | |
2811 | ERROR("failed to retrieve the ifindex for %s", peer); | |
b84f58b9 | 2812 | lxc_netdev_delete_by_name(peer); |
26c39028 JHS |
2813 | return -1; |
2814 | } | |
2815 | ||
a589434e | 2816 | DEBUG("instantiated vlan '%s', ifindex is '%d'", " vlan1000", |
e892973e | 2817 | netdev->ifindex); |
b4fb7de1 | 2818 | if (netdev->mtu) { |
b7b2fde4 CB |
2819 | if (lxc_safe_uint(netdev->mtu, &mtu) < 0) { |
2820 | ERROR("Failed to retrieve mtu from: '%d'/'%s'.", | |
2821 | netdev->ifindex, netdev->name); | |
2822 | return -1; | |
2823 | } | |
2824 | err = lxc_netdev_set_mtu(peer, mtu); | |
b4fb7de1 VL |
2825 | if (err) { |
2826 | ERROR("failed to set mtu '%s' for %s : %s", | |
2827 | netdev->mtu, peer, strerror(-err)); | |
2828 | lxc_netdev_delete_by_name(peer); | |
2829 | return -1; | |
2830 | } | |
2831 | } | |
e892973e | 2832 | |
26c39028 JHS |
2833 | return 0; |
2834 | } | |
2835 | ||
74a2b586 JK |
2836 | static int shutdown_vlan(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2837 | { | |
2838 | return 0; | |
2839 | } | |
2840 | ||
a589434e | 2841 | static int instantiate_phys(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2842 | { |
6168e99f DL |
2843 | if (!netdev->link) { |
2844 | ERROR("no link specified for the physical interface"); | |
2845 | return -1; | |
2846 | } | |
2847 | ||
9d083402 | 2848 | netdev->ifindex = if_nametoindex(netdev->link); |
82d5ae15 | 2849 | if (!netdev->ifindex) { |
9d083402 | 2850 | ERROR("failed to retrieve the index for %s", netdev->link); |
0ad19a3f | 2851 | return -1; |
2852 | } | |
2853 | ||
e3b4c4c4 ST |
2854 | if (netdev->upscript) { |
2855 | int err; | |
751d9dcd DL |
2856 | err = run_script(handler->name, "net", netdev->upscript, |
2857 | "up", "phys", netdev->link, (char*) NULL); | |
2858 | if (err) | |
e3b4c4c4 | 2859 | return -1; |
e3b4c4c4 ST |
2860 | } |
2861 | ||
82d5ae15 | 2862 | return 0; |
0ad19a3f | 2863 | } |
2864 | ||
74a2b586 JK |
2865 | static int shutdown_phys(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2866 | { | |
2867 | int err; | |
2868 | ||
2869 | if (netdev->downscript) { | |
2870 | err = run_script(handler->name, "net", netdev->downscript, | |
2871 | "down", "phys", netdev->link, (char*) NULL); | |
2872 | if (err) | |
2873 | return -1; | |
2874 | } | |
2875 | return 0; | |
2876 | } | |
2877 | ||
a589434e | 2878 | static int instantiate_none(struct lxc_handler *handler, struct lxc_netdev *netdev) |
26b797f3 SH |
2879 | { |
2880 | netdev->ifindex = 0; | |
2881 | return 0; | |
2882 | } | |
2883 | ||
a589434e | 2884 | static int instantiate_empty(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2885 | { |
82d5ae15 | 2886 | netdev->ifindex = 0; |
e3b4c4c4 ST |
2887 | if (netdev->upscript) { |
2888 | int err; | |
751d9dcd DL |
2889 | err = run_script(handler->name, "net", netdev->upscript, |
2890 | "up", "empty", (char*) NULL); | |
2891 | if (err) | |
e3b4c4c4 | 2892 | return -1; |
e3b4c4c4 | 2893 | } |
82d5ae15 | 2894 | return 0; |
0ad19a3f | 2895 | } |
2896 | ||
74a2b586 JK |
2897 | static int shutdown_empty(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2898 | { | |
2899 | int err; | |
2900 | ||
2901 | if (netdev->downscript) { | |
2902 | err = run_script(handler->name, "net", netdev->downscript, | |
2903 | "down", "empty", (char*) NULL); | |
2904 | if (err) | |
2905 | return -1; | |
2906 | } | |
2907 | return 0; | |
2908 | } | |
2909 | ||
26b797f3 SH |
2910 | static int shutdown_none(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2911 | { | |
2912 | return 0; | |
2913 | } | |
2914 | ||
2915 | int lxc_requests_empty_network(struct lxc_handler *handler) | |
2916 | { | |
2917 | struct lxc_list *network = &handler->conf->network; | |
2918 | struct lxc_list *iterator; | |
2919 | struct lxc_netdev *netdev; | |
2920 | bool found_none = false, found_nic = false; | |
2921 | ||
2922 | if (lxc_list_empty(network)) | |
2923 | return 0; | |
2924 | ||
2925 | lxc_list_for_each(iterator, network) { | |
2926 | ||
2927 | netdev = iterator->elem; | |
2928 | ||
2929 | if (netdev->type == LXC_NET_NONE) | |
2930 | found_none = true; | |
2931 | else | |
2932 | found_nic = true; | |
2933 | } | |
2934 | if (found_none && !found_nic) | |
2935 | return 1; | |
2936 | return 0; | |
2937 | } | |
2938 | ||
e3b4c4c4 | 2939 | int lxc_create_network(struct lxc_handler *handler) |
0ad19a3f | 2940 | { |
e3b4c4c4 | 2941 | struct lxc_list *network = &handler->conf->network; |
82d5ae15 | 2942 | struct lxc_list *iterator; |
82d5ae15 | 2943 | struct lxc_netdev *netdev; |
cbef6c52 SH |
2944 | int am_root = (getuid() == 0); |
2945 | ||
2946 | if (!am_root) | |
2947 | return 0; | |
0ad19a3f | 2948 | |
5f4535a3 | 2949 | lxc_list_for_each(iterator, network) { |
0ad19a3f | 2950 | |
5f4535a3 | 2951 | netdev = iterator->elem; |
13954cce | 2952 | |
24654103 | 2953 | if (netdev->type < 0 || netdev->type > LXC_NET_MAXCONFTYPE) { |
82d5ae15 | 2954 | ERROR("invalid network configuration type '%d'", |
5f4535a3 | 2955 | netdev->type); |
82d5ae15 DL |
2956 | return -1; |
2957 | } | |
0ad19a3f | 2958 | |
e3b4c4c4 | 2959 | if (netdev_conf[netdev->type](handler, netdev)) { |
82d5ae15 DL |
2960 | ERROR("failed to create netdev"); |
2961 | return -1; | |
2962 | } | |
e3b4c4c4 | 2963 | |
0ad19a3f | 2964 | } |
2965 | ||
2966 | return 0; | |
2967 | } | |
2968 | ||
358daf49 | 2969 | bool lxc_delete_network(struct lxc_handler *handler) |
7fef7a06 | 2970 | { |
e97946ae | 2971 | int ret; |
74a2b586 | 2972 | struct lxc_list *network = &handler->conf->network; |
7fef7a06 DL |
2973 | struct lxc_list *iterator; |
2974 | struct lxc_netdev *netdev; | |
358daf49 | 2975 | bool deleted_all = true; |
7fef7a06 DL |
2976 | |
2977 | lxc_list_for_each(iterator, network) { | |
2978 | netdev = iterator->elem; | |
d472214b | 2979 | |
74a2b586 | 2980 | if (netdev->ifindex != 0 && netdev->type == LXC_NET_PHYS) { |
d8f8e352 | 2981 | if (lxc_netdev_rename_by_index(netdev->ifindex, netdev->link)) |
358daf49 CB |
2982 | WARN("Failed to rename interface with index %d " |
2983 | "to its initial name \"%s\".", | |
2984 | netdev->ifindex, netdev->link); | |
d472214b | 2985 | continue; |
d8f8e352 | 2986 | } |
d472214b | 2987 | |
74a2b586 | 2988 | if (netdev_deconf[netdev->type](handler, netdev)) { |
e97946ae | 2989 | WARN("Failed to destroy netdev"); |
74a2b586 JK |
2990 | } |
2991 | ||
d8f8e352 DL |
2992 | /* Recent kernel remove the virtual interfaces when the network |
2993 | * namespace is destroyed but in case we did not moved the | |
2994 | * interface to the network namespace, we have to destroy it | |
2995 | */ | |
e97946ae CB |
2996 | if (netdev->ifindex != 0) { |
2997 | ret = lxc_netdev_delete_by_index(netdev->ifindex); | |
358daf49 CB |
2998 | if (-ret == ENODEV) { |
2999 | INFO("Interface \"%s\" with index %d already " | |
3000 | "deleted or existing in different network " | |
3001 | "namespace.", | |
3002 | netdev->name ? netdev->name : "(null)", | |
3003 | netdev->ifindex); | |
3004 | } else if (ret < 0) { | |
3005 | deleted_all = false; | |
3006 | WARN("Failed to remove interface \"%s\" with " | |
3007 | "index %d: %s.", | |
3008 | netdev->name ? netdev->name : "(null)", | |
3009 | netdev->ifindex, strerror(-ret)); | |
3010 | } else { | |
3011 | INFO("Removed interface \"%s\" with index %d.", | |
3012 | netdev->name ? netdev->name : "(null)", | |
3013 | netdev->ifindex); | |
3014 | } | |
e97946ae CB |
3015 | } |
3016 | ||
3017 | /* Explicitly delete host veth device to prevent lingering | |
3018 | * devices. We had issues in LXD around this. | |
3019 | */ | |
9aaaad30 | 3020 | if (netdev->type == LXC_NET_VETH && !am_unpriv()) { |
358daf49 CB |
3021 | char *hostveth; |
3022 | if (netdev->priv.veth_attr.pair) { | |
e97946ae | 3023 | hostveth = netdev->priv.veth_attr.pair; |
358daf49 CB |
3024 | ret = lxc_netdev_delete_by_name(hostveth); |
3025 | if (ret < 0) { | |
3026 | WARN("Failed to remove interface \"%s\" from host: %s.", hostveth, strerror(-ret)); | |
3027 | } else { | |
3028 | INFO("Removed interface \"%s\" from host.", hostveth); | |
3029 | free(netdev->priv.veth_attr.pair); | |
3030 | netdev->priv.veth_attr.pair = NULL; | |
3031 | } | |
3032 | } else if (strlen(netdev->priv.veth_attr.veth1) > 0) { | |
e97946ae | 3033 | hostveth = netdev->priv.veth_attr.veth1; |
e97946ae | 3034 | ret = lxc_netdev_delete_by_name(hostveth); |
358daf49 CB |
3035 | if (ret < 0) { |
3036 | WARN("Failed to remove \"%s\" from host: %s.", hostveth, strerror(-ret)); | |
3037 | } else { | |
3038 | INFO("Removed interface \"%s\" from host.", hostveth); | |
3039 | memset((void *)&netdev->priv.veth_attr.veth1, 0, sizeof(netdev->priv.veth_attr.veth1)); | |
3040 | } | |
e97946ae CB |
3041 | } |
3042 | } | |
7fef7a06 | 3043 | } |
358daf49 CB |
3044 | |
3045 | return deleted_all; | |
7fef7a06 DL |
3046 | } |
3047 | ||
45e854dc SG |
3048 | #define LXC_USERNIC_PATH LIBEXECDIR "/lxc/lxc-user-nic" |
3049 | ||
fe1f672f | 3050 | /* lxc-user-nic returns "interface_name:interface_name\n" */ |
eab15c1e | 3051 | #define MAX_BUFFER_SIZE IFNAMSIZ * 2 + 2 |
c43cbc04 SH |
3052 | static int unpriv_assign_nic(const char *lxcpath, char *lxcname, |
3053 | struct lxc_netdev *netdev, pid_t pid) | |
cbef6c52 SH |
3054 | { |
3055 | pid_t child; | |
a7242d9a ÇO |
3056 | int bytes, pipefd[2]; |
3057 | char *token, *saveptr = NULL; | |
fe1f672f | 3058 | char buffer[MAX_BUFFER_SIZE]; |
091045f8 | 3059 | char netdev_link[IFNAMSIZ + 1]; |
cbef6c52 SH |
3060 | |
3061 | if (netdev->type != LXC_NET_VETH) { | |
3062 | ERROR("nic type %d not support for unprivileged use", | |
091045f8 | 3063 | netdev->type); |
cbef6c52 SH |
3064 | return -1; |
3065 | } | |
3066 | ||
091045f8 | 3067 | if (pipe(pipefd) < 0) { |
a7242d9a ÇO |
3068 | SYSERROR("pipe failed"); |
3069 | return -1; | |
3070 | } | |
3071 | ||
091045f8 CB |
3072 | child = fork(); |
3073 | if (child < 0) { | |
cbef6c52 | 3074 | SYSERROR("fork"); |
a7242d9a ÇO |
3075 | close(pipefd[0]); |
3076 | close(pipefd[1]); | |
3077 | return -1; | |
3078 | } | |
3079 | ||
3080 | if (child == 0) { // child | |
091045f8 CB |
3081 | /* Call lxc-user-nic pid type bridge. */ |
3082 | int ret; | |
3083 | char pidstr[LXC_NUMSTRLEN64]; | |
3084 | ||
3085 | close(pipefd[0]); /* Close the read-end of the pipe. */ | |
3086 | ||
3087 | /* Redirect stdout to write-end of the pipe. */ | |
3088 | ret = dup2(pipefd[1], STDOUT_FILENO); | |
3089 | close(pipefd[1]); /* Close the write-end of the pipe. */ | |
3090 | if (ret < 0) { | |
3091 | SYSERROR("Failed to dup2() to redirect stdout to pipe file descriptor."); | |
3092 | exit(EXIT_FAILURE); | |
3093 | } | |
a7242d9a | 3094 | |
091045f8 | 3095 | if (netdev->link) |
cff7b5eb | 3096 | strncpy(netdev_link, netdev->link, IFNAMSIZ); |
091045f8 | 3097 | else |
cff7b5eb | 3098 | strncpy(netdev_link, "none", IFNAMSIZ); |
091045f8 CB |
3099 | |
3100 | ret = snprintf(pidstr, LXC_NUMSTRLEN64, "%d", pid); | |
3101 | if (ret < 0 || ret >= LXC_NUMSTRLEN64) | |
3102 | exit(EXIT_FAILURE); | |
3103 | pidstr[LXC_NUMSTRLEN64 - 1] = '\0'; | |
3104 | ||
3105 | INFO("Execing lxc-user-nic %s %s %s veth %s %s", lxcpath, | |
3106 | lxcname, pidstr, netdev_link, netdev->name); | |
c43cbc04 | 3107 | execlp(LXC_USERNIC_PATH, LXC_USERNIC_PATH, lxcpath, lxcname, |
091045f8 CB |
3108 | pidstr, "veth", netdev_link, netdev->name, NULL); |
3109 | ||
3110 | SYSERROR("Failed to exec lxc-user-nic."); | |
3111 | exit(EXIT_FAILURE); | |
a7242d9a ÇO |
3112 | } |
3113 | ||
3114 | /* close the write-end of the pipe */ | |
3115 | close(pipefd[1]); | |
3116 | ||
fe1f672f | 3117 | bytes = read(pipefd[0], &buffer, MAX_BUFFER_SIZE); |
091045f8 CB |
3118 | if (bytes < 0) |
3119 | SYSERROR("Failed to read from pipe file descriptor."); | |
a7242d9a ÇO |
3120 | buffer[bytes - 1] = '\0'; |
3121 | ||
3122 | if (wait_for_pid(child) != 0) { | |
3123 | close(pipefd[0]); | |
cbef6c52 SH |
3124 | return -1; |
3125 | } | |
3126 | ||
a7242d9a ÇO |
3127 | /* close the read-end of the pipe */ |
3128 | close(pipefd[0]); | |
cbef6c52 | 3129 | |
a7242d9a ÇO |
3130 | /* fill netdev->name field */ |
3131 | token = strtok_r(buffer, ":", &saveptr); | |
3132 | if (!token) | |
3133 | return -1; | |
091045f8 CB |
3134 | |
3135 | netdev->name = malloc(IFNAMSIZ + 1); | |
658979c5 | 3136 | if (!netdev->name) { |
091045f8 | 3137 | SYSERROR("Failed to allocate memory."); |
658979c5 SH |
3138 | return -1; |
3139 | } | |
091045f8 | 3140 | memset(netdev->name, 0, IFNAMSIZ + 1); |
658979c5 | 3141 | strncpy(netdev->name, token, IFNAMSIZ); |
a7242d9a ÇO |
3142 | |
3143 | /* fill netdev->veth_attr.pair field */ | |
3144 | token = strtok_r(NULL, ":", &saveptr); | |
3145 | if (!token) | |
3146 | return -1; | |
091045f8 | 3147 | |
a7242d9a | 3148 | netdev->priv.veth_attr.pair = strdup(token); |
658979c5 | 3149 | if (!netdev->priv.veth_attr.pair) { |
091045f8 | 3150 | ERROR("Failed to allocate memory."); |
658979c5 SH |
3151 | return -1; |
3152 | } | |
45e854dc | 3153 | |
a7242d9a | 3154 | return 0; |
cbef6c52 SH |
3155 | } |
3156 | ||
c43cbc04 SH |
3157 | int lxc_assign_network(const char *lxcpath, char *lxcname, |
3158 | struct lxc_list *network, pid_t pid) | |
0ad19a3f | 3159 | { |
82d5ae15 | 3160 | struct lxc_list *iterator; |
82d5ae15 | 3161 | struct lxc_netdev *netdev; |
f2e206ff | 3162 | char ifname[IFNAMSIZ]; |
cbef6c52 | 3163 | int am_root = (getuid() == 0); |
3cfc0f3a | 3164 | int err; |
0ad19a3f | 3165 | |
5f4535a3 | 3166 | lxc_list_for_each(iterator, network) { |
82d5ae15 | 3167 | |
5f4535a3 | 3168 | netdev = iterator->elem; |
82d5ae15 | 3169 | |
fbb16259 | 3170 | if (netdev->type == LXC_NET_VETH && !am_root) { |
c43cbc04 | 3171 | if (unpriv_assign_nic(lxcpath, lxcname, netdev, pid)) |
cbef6c52 | 3172 | return -1; |
658979c5 SH |
3173 | // lxc-user-nic has moved the nic to the new ns. |
3174 | // unpriv_assign_nic() fills in netdev->name. | |
3175 | // netdev->ifindex will be filed in at setup_netdev. | |
cbef6c52 SH |
3176 | continue; |
3177 | } | |
236087a6 | 3178 | |
fbb16259 SH |
3179 | /* empty network namespace, nothing to move */ |
3180 | if (!netdev->ifindex) | |
3181 | continue; | |
3182 | ||
f2e206ff | 3183 | /* retrieve the name of the interface */ |
3184 | if (!if_indextoname(netdev->ifindex, ifname)) { | |
3185 | ERROR("no interface corresponding to index '%d'", netdev->ifindex); | |
3186 | return -1; | |
3187 | } | |
3188 | ||
3189 | err = lxc_netdev_move_by_name(ifname, pid, NULL); | |
3cfc0f3a MN |
3190 | if (err) { |
3191 | ERROR("failed to move '%s' to the container : %s", | |
3192 | netdev->link, strerror(-err)); | |
82d5ae15 DL |
3193 | return -1; |
3194 | } | |
3195 | ||
198cbbaa | 3196 | DEBUG("move '%s'/'%s' to '%d': .", ifname, netdev->name, pid); |
0ad19a3f | 3197 | } |
3198 | ||
3199 | return 0; | |
3200 | } | |
3201 | ||
251d0d2a DE |
3202 | static int write_id_mapping(enum idtype idtype, pid_t pid, const char *buf, |
3203 | size_t buf_size) | |
f6d3e3e4 SH |
3204 | { |
3205 | char path[PATH_MAX]; | |
e4ccd113 | 3206 | int ret, closeret; |
f6d3e3e4 SH |
3207 | FILE *f; |
3208 | ||
3209 | ret = snprintf(path, PATH_MAX, "/proc/%d/%cid_map", pid, idtype == ID_TYPE_UID ? 'u' : 'g'); | |
3210 | if (ret < 0 || ret >= PATH_MAX) { | |
03fadd16 | 3211 | fprintf(stderr, "%s: path name too long\n", __func__); |
f6d3e3e4 SH |
3212 | return -E2BIG; |
3213 | } | |
3214 | f = fopen(path, "w"); | |
3215 | if (!f) { | |
3216 | perror("open"); | |
3217 | return -EINVAL; | |
3218 | } | |
251d0d2a | 3219 | ret = fwrite(buf, buf_size, 1, f); |
f6d3e3e4 | 3220 | if (ret < 0) |
e4ccd113 SH |
3221 | SYSERROR("writing id mapping"); |
3222 | closeret = fclose(f); | |
3223 | if (closeret) | |
3224 | SYSERROR("writing id mapping"); | |
3225 | return ret < 0 ? ret : closeret; | |
f6d3e3e4 SH |
3226 | } |
3227 | ||
3228 | int lxc_map_ids(struct lxc_list *idmap, pid_t pid) | |
3229 | { | |
3230 | struct lxc_list *iterator; | |
3231 | struct id_map *map; | |
8afb3e61 | 3232 | int ret = 0, use_shadow = 0; |
251d0d2a | 3233 | enum idtype type; |
8afb3e61 SG |
3234 | char *buf = NULL, *pos, *cmdpath = NULL; |
3235 | ||
22038de5 SH |
3236 | /* |
3237 | * If newuidmap exists, that is, if shadow is handing out subuid | |
3238 | * ranges, then insist that root also reserve ranges in subuid. This | |
3239 | * will protected it by preventing another user from being handed the | |
3240 | * range by shadow. | |
3241 | */ | |
9d9c111c | 3242 | cmdpath = on_path("newuidmap", NULL); |
8afb3e61 SG |
3243 | if (cmdpath) { |
3244 | use_shadow = 1; | |
3245 | free(cmdpath); | |
3246 | } | |
3247 | ||
0e6e3a41 SG |
3248 | if (!use_shadow && geteuid()) { |
3249 | ERROR("Missing newuidmap/newgidmap"); | |
3250 | return -1; | |
3251 | } | |
251d0d2a DE |
3252 | |
3253 | for(type = ID_TYPE_UID; type <= ID_TYPE_GID; type++) { | |
4f7521b4 | 3254 | int left, fill; |
cf3ef16d SH |
3255 | int had_entry = 0; |
3256 | if (!buf) { | |
3257 | buf = pos = malloc(4096); | |
4f7521b4 SH |
3258 | if (!buf) |
3259 | return -ENOMEM; | |
cf3ef16d SH |
3260 | } |
3261 | pos = buf; | |
0e6e3a41 | 3262 | if (use_shadow) |
d1838f34 | 3263 | pos += sprintf(buf, "new%cidmap %d", |
cf3ef16d SH |
3264 | type == ID_TYPE_UID ? 'u' : 'g', |
3265 | pid); | |
4f7521b4 | 3266 | |
cf3ef16d SH |
3267 | lxc_list_for_each(iterator, idmap) { |
3268 | /* The kernel only takes <= 4k for writes to /proc/<nr>/[ug]id_map */ | |
251d0d2a | 3269 | map = iterator->elem; |
cf3ef16d SH |
3270 | if (map->idtype != type) |
3271 | continue; | |
3272 | ||
3273 | had_entry = 1; | |
3274 | left = 4096 - (pos - buf); | |
d1838f34 | 3275 | fill = snprintf(pos, left, "%s%lu %lu %lu%s", |
0e6e3a41 | 3276 | use_shadow ? " " : "", |
d1838f34 | 3277 | map->nsid, map->hostid, map->range, |
0e6e3a41 | 3278 | use_shadow ? "" : "\n"); |
cf3ef16d SH |
3279 | if (fill <= 0 || fill >= left) |
3280 | SYSERROR("snprintf failed, too many mappings"); | |
3281 | pos += fill; | |
251d0d2a | 3282 | } |
cf3ef16d | 3283 | if (!had_entry) |
4f7521b4 | 3284 | continue; |
cf3ef16d | 3285 | |
0e6e3a41 | 3286 | if (!use_shadow) { |
cf3ef16d | 3287 | ret = write_id_mapping(type, pid, buf, pos-buf); |
d1838f34 MS |
3288 | } else { |
3289 | left = 4096 - (pos - buf); | |
3290 | fill = snprintf(pos, left, "\n"); | |
3291 | if (fill <= 0 || fill >= left) | |
3292 | SYSERROR("snprintf failed, too many mappings"); | |
3293 | pos += fill; | |
cf3ef16d | 3294 | ret = system(buf); |
d1838f34 | 3295 | } |
cf3ef16d | 3296 | |
f6d3e3e4 SH |
3297 | if (ret) |
3298 | break; | |
3299 | } | |
251d0d2a | 3300 | |
f10fad2f | 3301 | free(buf); |
f6d3e3e4 SH |
3302 | return ret; |
3303 | } | |
3304 | ||
cf3ef16d | 3305 | /* |
7b50c609 TS |
3306 | * return the host uid/gid to which the container root is mapped in |
3307 | * *val. | |
0b3a6504 | 3308 | * Return true if id was found, false otherwise. |
cf3ef16d | 3309 | */ |
2a9a80cb | 3310 | bool get_mapped_rootid(struct lxc_conf *conf, enum idtype idtype, |
3ec1648d | 3311 | unsigned long *val) |
cf3ef16d SH |
3312 | { |
3313 | struct lxc_list *it; | |
3314 | struct id_map *map; | |
3315 | ||
3316 | lxc_list_for_each(it, &conf->id_map) { | |
3317 | map = it->elem; | |
7b50c609 | 3318 | if (map->idtype != idtype) |
cf3ef16d SH |
3319 | continue; |
3320 | if (map->nsid != 0) | |
3321 | continue; | |
2a9a80cb SH |
3322 | *val = map->hostid; |
3323 | return true; | |
cf3ef16d | 3324 | } |
2a9a80cb | 3325 | return false; |
cf3ef16d SH |
3326 | } |
3327 | ||
2133f58c | 3328 | int mapped_hostid(unsigned id, struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d SH |
3329 | { |
3330 | struct lxc_list *it; | |
3331 | struct id_map *map; | |
3332 | lxc_list_for_each(it, &conf->id_map) { | |
3333 | map = it->elem; | |
2133f58c | 3334 | if (map->idtype != idtype) |
cf3ef16d SH |
3335 | continue; |
3336 | if (id >= map->hostid && id < map->hostid + map->range) | |
57d116ab | 3337 | return (id - map->hostid) + map->nsid; |
cf3ef16d | 3338 | } |
57d116ab | 3339 | return -1; |
cf3ef16d SH |
3340 | } |
3341 | ||
2133f58c | 3342 | int find_unmapped_nsuid(struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d SH |
3343 | { |
3344 | struct lxc_list *it; | |
3345 | struct id_map *map; | |
2133f58c | 3346 | unsigned int freeid = 0; |
cf3ef16d SH |
3347 | again: |
3348 | lxc_list_for_each(it, &conf->id_map) { | |
3349 | map = it->elem; | |
2133f58c | 3350 | if (map->idtype != idtype) |
cf3ef16d SH |
3351 | continue; |
3352 | if (freeid >= map->nsid && freeid < map->nsid + map->range) { | |
3353 | freeid = map->nsid + map->range; | |
3354 | goto again; | |
3355 | } | |
3356 | } | |
3357 | return freeid; | |
3358 | } | |
3359 | ||
19a26f82 MK |
3360 | int lxc_find_gateway_addresses(struct lxc_handler *handler) |
3361 | { | |
3362 | struct lxc_list *network = &handler->conf->network; | |
3363 | struct lxc_list *iterator; | |
3364 | struct lxc_netdev *netdev; | |
3365 | int link_index; | |
3366 | ||
3367 | lxc_list_for_each(iterator, network) { | |
3368 | netdev = iterator->elem; | |
3369 | ||
3370 | if (!netdev->ipv4_gateway_auto && !netdev->ipv6_gateway_auto) | |
3371 | continue; | |
3372 | ||
3373 | if (netdev->type != LXC_NET_VETH && netdev->type != LXC_NET_MACVLAN) { | |
3374 | ERROR("gateway = auto only supported for " | |
3375 | "veth and macvlan"); | |
3376 | return -1; | |
3377 | } | |
3378 | ||
3379 | if (!netdev->link) { | |
3380 | ERROR("gateway = auto needs a link interface"); | |
3381 | return -1; | |
3382 | } | |
3383 | ||
3384 | link_index = if_nametoindex(netdev->link); | |
3385 | if (!link_index) | |
3386 | return -EINVAL; | |
3387 | ||
3388 | if (netdev->ipv4_gateway_auto) { | |
3389 | if (lxc_ipv4_addr_get(link_index, &netdev->ipv4_gateway)) { | |
3390 | ERROR("failed to automatically find ipv4 gateway " | |
3391 | "address from link interface '%s'", netdev->link); | |
3392 | return -1; | |
3393 | } | |
3394 | } | |
3395 | ||
3396 | if (netdev->ipv6_gateway_auto) { | |
3397 | if (lxc_ipv6_addr_get(link_index, &netdev->ipv6_gateway)) { | |
3398 | ERROR("failed to automatically find ipv6 gateway " | |
3399 | "address from link interface '%s'", netdev->link); | |
3400 | return -1; | |
3401 | } | |
3402 | } | |
3403 | } | |
3404 | ||
3405 | return 0; | |
3406 | } | |
3407 | ||
5e4a62bf | 3408 | int lxc_create_tty(const char *name, struct lxc_conf *conf) |
b0a33c1e | 3409 | { |
5e4a62bf | 3410 | struct lxc_tty_info *tty_info = &conf->tty_info; |
025ed0f3 | 3411 | int i, ret; |
b0a33c1e | 3412 | |
5e4a62bf DL |
3413 | /* no tty in the configuration */ |
3414 | if (!conf->tty) | |
b0a33c1e | 3415 | return 0; |
3416 | ||
13954cce | 3417 | tty_info->pty_info = |
e4e7d59d | 3418 | malloc(sizeof(*tty_info->pty_info)*conf->tty); |
b0a33c1e | 3419 | if (!tty_info->pty_info) { |
36eb9bde | 3420 | SYSERROR("failed to allocate pty_info"); |
985d15b1 | 3421 | return -1; |
b0a33c1e | 3422 | } |
3423 | ||
985d15b1 | 3424 | for (i = 0; i < conf->tty; i++) { |
13954cce | 3425 | |
b0a33c1e | 3426 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; |
3427 | ||
025ed0f3 SH |
3428 | process_lock(); |
3429 | ret = openpty(&pty_info->master, &pty_info->slave, | |
3430 | pty_info->name, NULL, NULL); | |
3431 | process_unlock(); | |
3432 | if (ret) { | |
36eb9bde | 3433 | SYSERROR("failed to create pty #%d", i); |
985d15b1 MT |
3434 | tty_info->nbtty = i; |
3435 | lxc_delete_tty(tty_info); | |
3436 | return -1; | |
b0a33c1e | 3437 | } |
3438 | ||
5332bb84 DL |
3439 | DEBUG("allocated pty '%s' (%d/%d)", |
3440 | pty_info->name, pty_info->master, pty_info->slave); | |
3441 | ||
3ec1648d | 3442 | /* Prevent leaking the file descriptors to the container */ |
b035ad62 MS |
3443 | fcntl(pty_info->master, F_SETFD, FD_CLOEXEC); |
3444 | fcntl(pty_info->slave, F_SETFD, FD_CLOEXEC); | |
3445 | ||
b0a33c1e | 3446 | pty_info->busy = 0; |
3447 | } | |
3448 | ||
985d15b1 | 3449 | tty_info->nbtty = conf->tty; |
1ac470c0 DL |
3450 | |
3451 | INFO("tty's configured"); | |
3452 | ||
985d15b1 | 3453 | return 0; |
b0a33c1e | 3454 | } |
3455 | ||
3456 | void lxc_delete_tty(struct lxc_tty_info *tty_info) | |
3457 | { | |
3458 | int i; | |
3459 | ||
3460 | for (i = 0; i < tty_info->nbtty; i++) { | |
3461 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; | |
3462 | ||
3463 | close(pty_info->master); | |
3464 | close(pty_info->slave); | |
3465 | } | |
3466 | ||
3467 | free(tty_info->pty_info); | |
e00c0242 | 3468 | tty_info->pty_info = NULL; |
b0a33c1e | 3469 | tty_info->nbtty = 0; |
3470 | } | |
3471 | ||
f6d3e3e4 | 3472 | /* |
7b50c609 TS |
3473 | * chown_mapped_root: for an unprivileged user with uid/gid X to |
3474 | * chown a dir to subuid/subgid Y, he needs to run chown as root | |
3475 | * in a userns where nsid 0 is mapped to hostuid/hostgid Y, and | |
3476 | * nsid Y is mapped to hostuid/hostgid X. That way, the container | |
3477 | * root is privileged with respect to hostuid/hostgid X, allowing | |
3478 | * him to do the chown. | |
f6d3e3e4 | 3479 | */ |
c4d10a05 | 3480 | int chown_mapped_root(char *path, struct lxc_conf *conf) |
f6d3e3e4 | 3481 | { |
7b50c609 TS |
3482 | uid_t rootuid; |
3483 | gid_t rootgid; | |
c4d10a05 | 3484 | pid_t pid; |
2a9a80cb | 3485 | unsigned long val; |
a7ef8753 | 3486 | char *chownpath = path; |
f6d3e3e4 | 3487 | |
2a9a80cb | 3488 | if (!get_mapped_rootid(conf, ID_TYPE_UID, &val)) { |
c4d10a05 SH |
3489 | ERROR("No mapping for container root"); |
3490 | return -1; | |
f6d3e3e4 | 3491 | } |
7b50c609 TS |
3492 | rootuid = (uid_t) val; |
3493 | if (!get_mapped_rootid(conf, ID_TYPE_GID, &val)) { | |
3494 | ERROR("No mapping for container root"); | |
3495 | return -1; | |
3496 | } | |
3497 | rootgid = (gid_t) val; | |
2a9a80cb | 3498 | |
a7ef8753 SH |
3499 | /* |
3500 | * In case of overlay, we want only the writeable layer | |
3501 | * to be chowned | |
3502 | */ | |
1f92162d | 3503 | if (strncmp(path, "overlayfs:", 10) == 0 || strncmp(path, "aufs:", 5) == 0) { |
a7ef8753 SH |
3504 | chownpath = strchr(path, ':'); |
3505 | if (!chownpath) { | |
3506 | ERROR("Bad overlay path: %s", path); | |
3507 | return -1; | |
3508 | } | |
3509 | chownpath = strchr(chownpath+1, ':'); | |
3510 | if (!chownpath) { | |
3511 | ERROR("Bad overlay path: %s", path); | |
3512 | return -1; | |
3513 | } | |
3514 | chownpath++; | |
3515 | } | |
3516 | path = chownpath; | |
c4d10a05 | 3517 | if (geteuid() == 0) { |
7b50c609 | 3518 | if (chown(path, rootuid, rootgid) < 0) { |
c4d10a05 SH |
3519 | ERROR("Error chowning %s", path); |
3520 | return -1; | |
3521 | } | |
3522 | return 0; | |
3523 | } | |
f3d7e4ca | 3524 | |
7b50c609 | 3525 | if (rootuid == geteuid()) { |
f3d7e4ca SH |
3526 | // nothing to do |
3527 | INFO("%s: container root is our uid; no need to chown" ,__func__); | |
3528 | return 0; | |
3529 | } | |
3530 | ||
c4d10a05 SH |
3531 | pid = fork(); |
3532 | if (pid < 0) { | |
3533 | SYSERROR("Failed forking"); | |
f6d3e3e4 SH |
3534 | return -1; |
3535 | } | |
c4d10a05 | 3536 | if (!pid) { |
7b50c609 TS |
3537 | int hostuid = geteuid(), hostgid = getegid(), ret; |
3538 | struct stat sb; | |
3539 | char map1[100], map2[100], map3[100], map4[100], map5[100]; | |
3540 | char ugid[100]; | |
3541 | char *args1[] = { "lxc-usernsexec", "-m", map1, "-m", map2, | |
3542 | "-m", map3, "-m", map5, | |
3543 | "--", "chown", ugid, path, NULL }; | |
3544 | char *args2[] = { "lxc-usernsexec", "-m", map1, "-m", map2, | |
3545 | "-m", map3, "-m", map4, "-m", map5, | |
3546 | "--", "chown", ugid, path, NULL }; | |
3547 | ||
3548 | // save the current gid of "path" | |
3549 | if (stat(path, &sb) < 0) { | |
3550 | ERROR("Error stat %s", path); | |
3551 | return -1; | |
3552 | } | |
f6d3e3e4 | 3553 | |
9a7c2aba SH |
3554 | /* |
3555 | * A file has to be group-owned by a gid mapped into the | |
3556 | * container, or the container won't be privileged over it. | |
3557 | */ | |
3558 | if (sb.st_uid == geteuid() && | |
3559 | mapped_hostid(sb.st_gid, conf, ID_TYPE_GID) < 0 && | |
3560 | chown(path, -1, hostgid) < 0) { | |
3561 | ERROR("Failed chgrping %s", path); | |
7b50c609 TS |
3562 | return -1; |
3563 | } | |
3564 | ||
3565 | // "u:0:rootuid:1" | |
3566 | ret = snprintf(map1, 100, "u:0:%d:1", rootuid); | |
c4d10a05 SH |
3567 | if (ret < 0 || ret >= 100) { |
3568 | ERROR("Error uid printing map string"); | |
f6d3e3e4 SH |
3569 | return -1; |
3570 | } | |
c4d10a05 | 3571 | |
98e5ba51 SH |
3572 | // "u:hostuid:hostuid:1" |
3573 | ret = snprintf(map2, 100, "u:%d:%d:1", hostuid, hostuid); | |
3574 | if (ret < 0 || ret >= 100) { | |
3575 | ERROR("Error uid printing map string"); | |
3576 | return -1; | |
3577 | } | |
3578 | ||
7b50c609 TS |
3579 | // "g:0:rootgid:1" |
3580 | ret = snprintf(map3, 100, "g:0:%d:1", rootgid); | |
c4d10a05 | 3581 | if (ret < 0 || ret >= 100) { |
7b50c609 | 3582 | ERROR("Error gid printing map string"); |
c4d10a05 SH |
3583 | return -1; |
3584 | } | |
3585 | ||
7b50c609 | 3586 | // "g:pathgid:rootgid+pathgid:1" |
b4c1e35d SG |
3587 | ret = snprintf(map4, 100, "g:%d:%d:1", (gid_t)sb.st_gid, |
3588 | rootgid + (gid_t)sb.st_gid); | |
7b50c609 TS |
3589 | if (ret < 0 || ret >= 100) { |
3590 | ERROR("Error gid printing map string"); | |
3591 | return -1; | |
3592 | } | |
3593 | ||
3594 | // "g:hostgid:hostgid:1" | |
3595 | ret = snprintf(map5, 100, "g:%d:%d:1", hostgid, hostgid); | |
3596 | if (ret < 0 || ret >= 100) { | |
3597 | ERROR("Error gid printing map string"); | |
3598 | return -1; | |
3599 | } | |
3600 | ||
3601 | // "0:pathgid" (chown) | |
b4c1e35d | 3602 | ret = snprintf(ugid, 100, "0:%d", (gid_t)sb.st_gid); |
7b50c609 TS |
3603 | if (ret < 0 || ret >= 100) { |
3604 | ERROR("Error owner printing format string for chown"); | |
3605 | return -1; | |
3606 | } | |
3607 | ||
3608 | if (hostgid == sb.st_gid) | |
3609 | ret = execvp("lxc-usernsexec", args1); | |
3610 | else | |
3611 | ret = execvp("lxc-usernsexec", args2); | |
c4d10a05 SH |
3612 | SYSERROR("Failed executing usernsexec"); |
3613 | exit(1); | |
f6d3e3e4 | 3614 | } |
c4d10a05 | 3615 | return wait_for_pid(pid); |
f6d3e3e4 SH |
3616 | } |
3617 | ||
c4d10a05 | 3618 | int ttys_shift_ids(struct lxc_conf *c) |
f6d3e3e4 | 3619 | { |
c4d10a05 | 3620 | if (lxc_list_empty(&c->id_map)) |
f6d3e3e4 | 3621 | return 0; |
c4d10a05 | 3622 | |
29b10e4f | 3623 | if (strcmp(c->console.name, "") !=0 && chown_mapped_root(c->console.name, c) < 0) { |
c4d10a05 SH |
3624 | ERROR("Failed to chown %s", c->console.name); |
3625 | return -1; | |
3626 | } | |
3627 | ||
f6d3e3e4 SH |
3628 | return 0; |
3629 | } | |
3630 | ||
f267d666 | 3631 | /* NOTE: not to be called from inside the container namespace! */ |
5112cd70 SH |
3632 | int tmp_proc_mount(struct lxc_conf *lxc_conf) |
3633 | { | |
3634 | int mounted; | |
3635 | ||
01958b1f | 3636 | mounted = mount_proc_if_needed(lxc_conf->rootfs.path ? lxc_conf->rootfs.mount : ""); |
5112cd70 SH |
3637 | if (mounted == -1) { |
3638 | SYSERROR("failed to mount /proc in the container."); | |
01958b1f DW |
3639 | /* continue only if there is no rootfs */ |
3640 | if (lxc_conf->rootfs.path) | |
3641 | return -1; | |
5112cd70 SH |
3642 | } else if (mounted == 1) { |
3643 | lxc_conf->tmp_umount_proc = 1; | |
3644 | } | |
3645 | return 0; | |
3646 | } | |
3647 | ||
3648 | void tmp_proc_unmount(struct lxc_conf *lxc_conf) | |
3649 | { | |
3650 | if (lxc_conf->tmp_umount_proc == 1) { | |
3651 | umount("/proc"); | |
3652 | lxc_conf->tmp_umount_proc = 0; | |
3653 | } | |
3654 | } | |
3655 | ||
6a0c909a | 3656 | void remount_all_slave(void) |
e995d7a2 SH |
3657 | { |
3658 | /* walk /proc/mounts and change any shared entries to slave */ | |
3659 | FILE *f = fopen("/proc/self/mountinfo", "r"); | |
3660 | char *line = NULL; | |
3661 | size_t len = 0; | |
3662 | ||
3663 | if (!f) { | |
3664 | SYSERROR("Failed to open /proc/self/mountinfo to mark all shared"); | |
3665 | ERROR("Continuing container startup..."); | |
3666 | return; | |
3667 | } | |
3668 | ||
3669 | while (getline(&line, &len, f) != -1) { | |
3670 | char *target, *opts; | |
3671 | target = get_field(line, 4); | |
3672 | if (!target) | |
3673 | continue; | |
3674 | opts = get_field(target, 2); | |
3675 | if (!opts) | |
3676 | continue; | |
3677 | null_endofword(opts); | |
3678 | if (!strstr(opts, "shared")) | |
3679 | continue; | |
3680 | null_endofword(target); | |
3681 | if (mount(NULL, target, NULL, MS_SLAVE, NULL)) { | |
3682 | SYSERROR("Failed to make %s rslave", target); | |
3683 | ERROR("Continuing..."); | |
3684 | } | |
3685 | } | |
3686 | fclose(f); | |
f10fad2f | 3687 | free(line); |
e995d7a2 SH |
3688 | } |
3689 | ||
2322903b SH |
3690 | void lxc_execute_bind_init(struct lxc_conf *conf) |
3691 | { | |
3692 | int ret; | |
9d9c111c SH |
3693 | char path[PATH_MAX], destpath[PATH_MAX], *p; |
3694 | ||
3695 | /* If init exists in the container, don't bind mount a static one */ | |
3696 | p = choose_init(conf->rootfs.mount); | |
3697 | if (p) { | |
3698 | free(p); | |
3699 | return; | |
3700 | } | |
2322903b SH |
3701 | |
3702 | ret = snprintf(path, PATH_MAX, SBINDIR "/init.lxc.static"); | |
3703 | if (ret < 0 || ret >= PATH_MAX) { | |
3704 | WARN("Path name too long searching for lxc.init.static"); | |
3705 | return; | |
3706 | } | |
3707 | ||
3708 | if (!file_exists(path)) { | |
3709 | INFO("%s does not exist on host", path); | |
3710 | return; | |
3711 | } | |
3712 | ||
3713 | ret = snprintf(destpath, PATH_MAX, "%s%s", conf->rootfs.mount, "/init.lxc.static"); | |
3714 | if (ret < 0 || ret >= PATH_MAX) { | |
3715 | WARN("Path name too long for container's lxc.init.static"); | |
3716 | return; | |
3717 | } | |
3718 | ||
3719 | if (!file_exists(destpath)) { | |
3720 | FILE * pathfile = fopen(destpath, "wb"); | |
3721 | if (!pathfile) { | |
3722 | SYSERROR("Failed to create mount target '%s'", destpath); | |
3723 | return; | |
3724 | } | |
3725 | fclose(pathfile); | |
3726 | } | |
3727 | ||
592fd47a | 3728 | ret = safe_mount(path, destpath, "none", MS_BIND, NULL, conf->rootfs.mount); |
2322903b SH |
3729 | if (ret < 0) |
3730 | SYSERROR("Failed to bind lxc.init.static into container"); | |
3731 | INFO("lxc.init.static bound into container at %s", path); | |
3732 | } | |
3733 | ||
35120d9c SH |
3734 | /* |
3735 | * This does the work of remounting / if it is shared, calling the | |
3736 | * container pre-mount hooks, and mounting the rootfs. | |
3737 | */ | |
3738 | int do_rootfs_setup(struct lxc_conf *conf, const char *name, const char *lxcpath) | |
0ad19a3f | 3739 | { |
35120d9c SH |
3740 | if (conf->rootfs_setup) { |
3741 | /* | |
3742 | * rootfs was set up in another namespace. bind-mount it | |
3743 | * to give us a mount in our own ns so we can pivot_root to it | |
3744 | */ | |
3745 | const char *path = conf->rootfs.mount; | |
3746 | if (mount(path, path, "rootfs", MS_BIND, NULL) < 0) { | |
3747 | ERROR("Failed to bind-mount container / onto itself"); | |
145832ba | 3748 | return -1; |
35120d9c | 3749 | } |
145832ba | 3750 | return 0; |
35120d9c | 3751 | } |
d4ef7c50 | 3752 | |
e995d7a2 SH |
3753 | remount_all_slave(); |
3754 | ||
35120d9c SH |
3755 | if (run_lxc_hooks(name, "pre-mount", conf, lxcpath, NULL)) { |
3756 | ERROR("failed to run pre-mount hooks for container '%s'.", name); | |
3757 | return -1; | |
3758 | } | |
3759 | ||
3760 | if (setup_rootfs(conf)) { | |
3761 | ERROR("failed to setup rootfs for '%s'", name); | |
3762 | return -1; | |
3763 | } | |
3764 | ||
3765 | conf->rootfs_setup = true; | |
3766 | return 0; | |
3767 | } | |
3768 | ||
1c1c7051 SH |
3769 | static bool verify_start_hooks(struct lxc_conf *conf) |
3770 | { | |
3771 | struct lxc_list *it; | |
3772 | char path[MAXPATHLEN]; | |
3773 | lxc_list_for_each(it, &conf->hooks[LXCHOOK_START]) { | |
3774 | char *hookname = it->elem; | |
3775 | struct stat st; | |
3776 | int ret; | |
3777 | ||
3778 | ret = snprintf(path, MAXPATHLEN, "%s%s", | |
7b6753e7 | 3779 | conf->rootfs.path ? conf->rootfs.mount : "", hookname); |
1c1c7051 SH |
3780 | if (ret < 0 || ret >= MAXPATHLEN) |
3781 | return false; | |
3782 | ret = stat(path, &st); | |
3783 | if (ret) { | |
7b6753e7 | 3784 | SYSERROR("Start hook %s not found in container", |
1c1c7051 SH |
3785 | hookname); |
3786 | return false; | |
3787 | } | |
6a0c909a | 3788 | return true; |
1c1c7051 SH |
3789 | } |
3790 | ||
3791 | return true; | |
3792 | } | |
3793 | ||
e8bd4e43 SH |
3794 | static int send_fd(int sock, int fd) |
3795 | { | |
3796 | int ret = lxc_abstract_unix_send_fd(sock, fd, NULL, 0); | |
3797 | ||
3798 | ||
3799 | if (ret < 0) { | |
3800 | SYSERROR("Error sending tty fd to parent"); | |
3801 | return -1; | |
3802 | } | |
3803 | ||
3804 | return 0; | |
3805 | } | |
3806 | ||
3807 | static int send_ttys_to_parent(struct lxc_handler *handler) | |
3808 | { | |
3809 | struct lxc_conf *conf = handler->conf; | |
3810 | const struct lxc_tty_info *tty_info = &conf->tty_info; | |
3811 | int i; | |
3812 | int sock = handler->ttysock[0]; | |
3813 | ||
3814 | for (i = 0; i < tty_info->nbtty; i++) { | |
3815 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; | |
3816 | if (send_fd(sock, pty_info->slave) < 0) | |
3817 | goto bad; | |
3818 | close(pty_info->slave); | |
3819 | pty_info->slave = -1; | |
3820 | if (send_fd(sock, pty_info->master) < 0) | |
3821 | goto bad; | |
3822 | close(pty_info->master); | |
3823 | pty_info->master = -1; | |
3824 | } | |
3825 | ||
3826 | close(handler->ttysock[0]); | |
3827 | close(handler->ttysock[1]); | |
3828 | ||
3829 | return 0; | |
3830 | ||
3831 | bad: | |
3832 | ERROR("Error writing tty fd to parent"); | |
3833 | return -1; | |
3834 | } | |
3835 | ||
35120d9c SH |
3836 | int lxc_setup(struct lxc_handler *handler) |
3837 | { | |
3838 | const char *name = handler->name; | |
3839 | struct lxc_conf *lxc_conf = handler->conf; | |
3840 | const char *lxcpath = handler->lxcpath; | |
35120d9c SH |
3841 | |
3842 | if (do_rootfs_setup(lxc_conf, name, lxcpath) < 0) { | |
3843 | ERROR("Error setting up rootfs mount after spawn"); | |
3844 | return -1; | |
3845 | } | |
3846 | ||
6c544cb3 MM |
3847 | if (lxc_conf->inherit_ns_fd[LXC_NS_UTS] == -1) { |
3848 | if (setup_utsname(lxc_conf->utsname)) { | |
3849 | ERROR("failed to setup the utsname for '%s'", name); | |
3850 | return -1; | |
3851 | } | |
0ad19a3f | 3852 | } |
3853 | ||
5f4535a3 | 3854 | if (setup_network(&lxc_conf->network)) { |
36eb9bde | 3855 | ERROR("failed to setup the network for '%s'", name); |
95b5ffaf | 3856 | return -1; |
0ad19a3f | 3857 | } |
3858 | ||
bc6928ff | 3859 | if (lxc_conf->autodev > 0) { |
14221cbb | 3860 | if (mount_autodev(name, &lxc_conf->rootfs, lxcpath)) { |
91c3830e | 3861 | ERROR("failed to mount /dev in the container"); |
c6883f38 SH |
3862 | return -1; |
3863 | } | |
3864 | } | |
3865 | ||
368bbc02 CS |
3866 | /* do automatic mounts (mainly /proc and /sys), but exclude |
3867 | * those that need to wait until other stuff has finished | |
3868 | */ | |
4fb3cba5 | 3869 | if (lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & ~LXC_AUTO_CGROUP_MASK, handler) < 0) { |
368bbc02 CS |
3870 | ERROR("failed to setup the automatic mounts for '%s'", name); |
3871 | return -1; | |
3872 | } | |
3873 | ||
0a2dddd4 | 3874 | if (setup_mount(&lxc_conf->rootfs, lxc_conf->fstab, name, lxcpath)) { |
36eb9bde | 3875 | ERROR("failed to setup the mounts for '%s'", name); |
95b5ffaf | 3876 | return -1; |
576f946d | 3877 | } |
3878 | ||
0a2dddd4 | 3879 | if (!lxc_list_empty(&lxc_conf->mount_list) && setup_mount_entries(&lxc_conf->rootfs, &lxc_conf->mount_list, name, lxcpath)) { |
e7938e9e MN |
3880 | ERROR("failed to setup the mount entries for '%s'", name); |
3881 | return -1; | |
3882 | } | |
3883 | ||
7b6753e7 | 3884 | /* Make sure any start hooks are in the container */ |
1c1c7051 SH |
3885 | if (!verify_start_hooks(lxc_conf)) |
3886 | return -1; | |
3887 | ||
2322903b SH |
3888 | if (lxc_conf->is_execute) |
3889 | lxc_execute_bind_init(lxc_conf); | |
3890 | ||
368bbc02 CS |
3891 | /* now mount only cgroup, if wanted; |
3892 | * before, /sys could not have been mounted | |
3893 | * (is either mounted automatically or via fstab entries) | |
3894 | */ | |
4fb3cba5 | 3895 | if (lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & LXC_AUTO_CGROUP_MASK, handler) < 0) { |
368bbc02 CS |
3896 | ERROR("failed to setup the automatic mounts for '%s'", name); |
3897 | return -1; | |
3898 | } | |
3899 | ||
283678ed | 3900 | if (run_lxc_hooks(name, "mount", lxc_conf, lxcpath, NULL)) { |
773fb9ca SH |
3901 | ERROR("failed to run mount hooks for container '%s'.", name); |
3902 | return -1; | |
3903 | } | |
3904 | ||
bc6928ff | 3905 | if (lxc_conf->autodev > 0) { |
0728ebf4 TA |
3906 | bool mount_console = lxc_conf->console.path && !strcmp(lxc_conf->console.path, "none"); |
3907 | ||
283678ed | 3908 | if (run_lxc_hooks(name, "autodev", lxc_conf, lxcpath, NULL)) { |
f7bee6c6 MW |
3909 | ERROR("failed to run autodev hooks for container '%s'.", name); |
3910 | return -1; | |
3911 | } | |
0728ebf4 | 3912 | if (fill_autodev(&lxc_conf->rootfs, mount_console)) { |
91c3830e SH |
3913 | ERROR("failed to populate /dev in the container"); |
3914 | return -1; | |
3915 | } | |
3916 | } | |
368bbc02 | 3917 | |
37903589 | 3918 | if (!lxc_conf->is_execute && setup_console(&lxc_conf->rootfs, &lxc_conf->console, lxc_conf->ttydir)) { |
36eb9bde | 3919 | ERROR("failed to setup the console for '%s'", name); |
95b5ffaf | 3920 | return -1; |
6e590161 | 3921 | } |
3922 | ||
7e0e1d94 AV |
3923 | if (lxc_conf->kmsg) { |
3924 | if (setup_kmsg(&lxc_conf->rootfs, &lxc_conf->console)) // don't fail | |
3925 | ERROR("failed to setup kmsg for '%s'", name); | |
3926 | } | |
1bd051a6 | 3927 | |
69aa6655 DE |
3928 | if (!lxc_conf->is_execute && setup_dev_symlinks(&lxc_conf->rootfs)) { |
3929 | ERROR("failed to setup /dev symlinks for '%s'", name); | |
3930 | return -1; | |
3931 | } | |
3932 | ||
5112cd70 SH |
3933 | /* mount /proc if it's not already there */ |
3934 | if (tmp_proc_mount(lxc_conf) < 0) { | |
fe4de9a6 | 3935 | ERROR("failed to LSM mount proc for '%s'", name); |
e075f5d9 | 3936 | return -1; |
e075f5d9 | 3937 | } |
e075f5d9 | 3938 | |
ac778708 | 3939 | if (setup_pivot_root(&lxc_conf->rootfs)) { |
36eb9bde | 3940 | ERROR("failed to set rootfs for '%s'", name); |
95b5ffaf | 3941 | return -1; |
ed502555 | 3942 | } |
3943 | ||
571e6ec8 | 3944 | if (setup_pts(lxc_conf->pts)) { |
36eb9bde | 3945 | ERROR("failed to setup the new pts instance"); |
95b5ffaf | 3946 | return -1; |
3c26f34e | 3947 | } |
3948 | ||
e8bd4e43 SH |
3949 | if (lxc_create_tty(name, lxc_conf)) { |
3950 | ERROR("failed to create the ttys"); | |
3951 | return -1; | |
3952 | } | |
3953 | ||
3954 | if (send_ttys_to_parent(handler) < 0) { | |
3955 | ERROR("failure sending console info to parent"); | |
3956 | return -1; | |
3957 | } | |
3958 | ||
3959 | ||
3960 | if (!lxc_conf->is_execute && setup_tty(lxc_conf)) { | |
3961 | ERROR("failed to setup the ttys for '%s'", name); | |
3962 | return -1; | |
3963 | } | |
3964 | ||
3965 | if (lxc_conf->pty_names && setenv("container_ttys", lxc_conf->pty_names, 1)) | |
3966 | SYSERROR("failed to set environment variable for container ptys"); | |
3967 | ||
3968 | ||
cccc74b5 DL |
3969 | if (setup_personality(lxc_conf->personality)) { |
3970 | ERROR("failed to setup personality"); | |
3971 | return -1; | |
3972 | } | |
3973 | ||
97a8f74f SG |
3974 | if (!lxc_list_empty(&lxc_conf->keepcaps)) { |
3975 | if (!lxc_list_empty(&lxc_conf->caps)) { | |
7389ca26 | 3976 | ERROR("Container requests lxc.cap.drop and lxc.cap.keep: either use lxc.cap.drop or lxc.cap.keep, not both."); |
f6d3e3e4 SH |
3977 | return -1; |
3978 | } | |
97a8f74f SG |
3979 | if (dropcaps_except(&lxc_conf->keepcaps)) { |
3980 | ERROR("failed to keep requested caps"); | |
3981 | return -1; | |
3982 | } | |
3983 | } else if (setup_caps(&lxc_conf->caps)) { | |
3984 | ERROR("failed to drop capabilities"); | |
3985 | return -1; | |
81810dd1 DL |
3986 | } |
3987 | ||
cd54d859 DL |
3988 | NOTICE("'%s' is setup.", name); |
3989 | ||
0ad19a3f | 3990 | return 0; |
3991 | } | |
26ddeedd | 3992 | |
283678ed SH |
3993 | int run_lxc_hooks(const char *name, char *hook, struct lxc_conf *conf, |
3994 | const char *lxcpath, char *argv[]) | |
26ddeedd SH |
3995 | { |
3996 | int which = -1; | |
3997 | struct lxc_list *it; | |
3998 | ||
3999 | if (strcmp(hook, "pre-start") == 0) | |
4000 | which = LXCHOOK_PRESTART; | |
5ea6163a SH |
4001 | else if (strcmp(hook, "pre-mount") == 0) |
4002 | which = LXCHOOK_PREMOUNT; | |
26ddeedd SH |
4003 | else if (strcmp(hook, "mount") == 0) |
4004 | which = LXCHOOK_MOUNT; | |
f7bee6c6 MW |
4005 | else if (strcmp(hook, "autodev") == 0) |
4006 | which = LXCHOOK_AUTODEV; | |
26ddeedd SH |
4007 | else if (strcmp(hook, "start") == 0) |
4008 | which = LXCHOOK_START; | |
52492063 WB |
4009 | else if (strcmp(hook, "stop") == 0) |
4010 | which = LXCHOOK_STOP; | |
26ddeedd SH |
4011 | else if (strcmp(hook, "post-stop") == 0) |
4012 | which = LXCHOOK_POSTSTOP; | |
148e91f5 SH |
4013 | else if (strcmp(hook, "clone") == 0) |
4014 | which = LXCHOOK_CLONE; | |
37cf711b SY |
4015 | else if (strcmp(hook, "destroy") == 0) |
4016 | which = LXCHOOK_DESTROY; | |
26ddeedd SH |
4017 | else |
4018 | return -1; | |
4019 | lxc_list_for_each(it, &conf->hooks[which]) { | |
4020 | int ret; | |
4021 | char *hookname = it->elem; | |
283678ed | 4022 | ret = run_script_argv(name, "lxc", hookname, hook, lxcpath, argv); |
26ddeedd SH |
4023 | if (ret) |
4024 | return ret; | |
4025 | } | |
4026 | return 0; | |
4027 | } | |
72d0e1cb | 4028 | |
427b3a21 | 4029 | static void lxc_remove_nic(struct lxc_list *it) |
72d0e1cb SG |
4030 | { |
4031 | struct lxc_netdev *netdev = it->elem; | |
9ebb03ad | 4032 | struct lxc_list *it2,*next; |
72d0e1cb SG |
4033 | |
4034 | lxc_list_del(it); | |
4035 | ||
f10fad2f ME |
4036 | free(netdev->link); |
4037 | free(netdev->name); | |
4038 | if (netdev->type == LXC_NET_VETH) | |
c9bb9a85 | 4039 | free(netdev->priv.veth_attr.pair); |
f10fad2f ME |
4040 | free(netdev->upscript); |
4041 | free(netdev->hwaddr); | |
4042 | free(netdev->mtu); | |
4043 | free(netdev->ipv4_gateway); | |
4044 | free(netdev->ipv6_gateway); | |
9ebb03ad | 4045 | lxc_list_for_each_safe(it2, &netdev->ipv4, next) { |
72d0e1cb SG |
4046 | lxc_list_del(it2); |
4047 | free(it2->elem); | |
4048 | free(it2); | |
4049 | } | |
9ebb03ad | 4050 | lxc_list_for_each_safe(it2, &netdev->ipv6, next) { |
72d0e1cb SG |
4051 | lxc_list_del(it2); |
4052 | free(it2->elem); | |
4053 | free(it2); | |
4054 | } | |
d95db067 | 4055 | free(netdev); |
72d0e1cb SG |
4056 | free(it); |
4057 | } | |
4058 | ||
4059 | /* we get passed in something like '0', '0.ipv4' or '1.ipv6' */ | |
12a50cc6 | 4060 | int lxc_clear_nic(struct lxc_conf *c, const char *key) |
72d0e1cb SG |
4061 | { |
4062 | char *p1; | |
4063 | int ret, idx, i; | |
4064 | struct lxc_list *it; | |
4065 | struct lxc_netdev *netdev; | |
4066 | ||
46cd2845 | 4067 | p1 = strchr(key, '.'); |
72d0e1cb SG |
4068 | if (!p1 || *(p1+1) == '\0') |
4069 | p1 = NULL; | |
4070 | ||
4071 | ret = sscanf(key, "%d", &idx); | |
4072 | if (ret != 1) return -1; | |
4073 | if (idx < 0) | |
4074 | return -1; | |
4075 | ||
4076 | i = 0; | |
4077 | lxc_list_for_each(it, &c->network) { | |
4078 | if (i == idx) | |
4079 | break; | |
4080 | i++; | |
4081 | } | |
4082 | if (i < idx) // we don't have that many nics defined | |
4083 | return -1; | |
4084 | ||
4085 | if (!it || !it->elem) | |
4086 | return -1; | |
4087 | ||
4088 | netdev = it->elem; | |
4089 | ||
4090 | if (!p1) { | |
4091 | lxc_remove_nic(it); | |
52d21d40 | 4092 | } else if (strcmp(p1, ".ipv4") == 0) { |
9ebb03ad DE |
4093 | struct lxc_list *it2,*next; |
4094 | lxc_list_for_each_safe(it2, &netdev->ipv4, next) { | |
72d0e1cb SG |
4095 | lxc_list_del(it2); |
4096 | free(it2->elem); | |
4097 | free(it2); | |
4098 | } | |
52d21d40 | 4099 | } else if (strcmp(p1, ".ipv6") == 0) { |
9ebb03ad DE |
4100 | struct lxc_list *it2,*next; |
4101 | lxc_list_for_each_safe(it2, &netdev->ipv6, next) { | |
72d0e1cb SG |
4102 | lxc_list_del(it2); |
4103 | free(it2->elem); | |
4104 | free(it2); | |
4105 | } | |
72d0e1cb SG |
4106 | } |
4107 | else return -1; | |
4108 | ||
4109 | return 0; | |
4110 | } | |
4111 | ||
4112 | int lxc_clear_config_network(struct lxc_conf *c) | |
4113 | { | |
9ebb03ad DE |
4114 | struct lxc_list *it,*next; |
4115 | lxc_list_for_each_safe(it, &c->network, next) { | |
72d0e1cb SG |
4116 | lxc_remove_nic(it); |
4117 | } | |
4118 | return 0; | |
4119 | } | |
4120 | ||
4121 | int lxc_clear_config_caps(struct lxc_conf *c) | |
4122 | { | |
9ebb03ad | 4123 | struct lxc_list *it,*next; |
72d0e1cb | 4124 | |
9ebb03ad | 4125 | lxc_list_for_each_safe(it, &c->caps, next) { |
72d0e1cb SG |
4126 | lxc_list_del(it); |
4127 | free(it->elem); | |
4128 | free(it); | |
4129 | } | |
4130 | return 0; | |
4131 | } | |
4132 | ||
74a3920a | 4133 | static int lxc_free_idmap(struct lxc_list *id_map) { |
27c27d73 SH |
4134 | struct lxc_list *it, *next; |
4135 | ||
4355ab5f | 4136 | lxc_list_for_each_safe(it, id_map, next) { |
27c27d73 SH |
4137 | lxc_list_del(it); |
4138 | free(it->elem); | |
4139 | free(it); | |
4140 | } | |
4141 | return 0; | |
4142 | } | |
4143 | ||
4355ab5f SH |
4144 | int lxc_clear_idmaps(struct lxc_conf *c) |
4145 | { | |
4146 | return lxc_free_idmap(&c->id_map); | |
4147 | } | |
4148 | ||
1fb86a7c SH |
4149 | int lxc_clear_config_keepcaps(struct lxc_conf *c) |
4150 | { | |
4151 | struct lxc_list *it,*next; | |
4152 | ||
4153 | lxc_list_for_each_safe(it, &c->keepcaps, next) { | |
4154 | lxc_list_del(it); | |
4155 | free(it->elem); | |
4156 | free(it); | |
4157 | } | |
4158 | return 0; | |
4159 | } | |
4160 | ||
12a50cc6 | 4161 | int lxc_clear_cgroups(struct lxc_conf *c, const char *key) |
72d0e1cb | 4162 | { |
9ebb03ad | 4163 | struct lxc_list *it,*next; |
72d0e1cb | 4164 | bool all = false; |
12a50cc6 | 4165 | const char *k = key + 11; |
72d0e1cb SG |
4166 | |
4167 | if (strcmp(key, "lxc.cgroup") == 0) | |
4168 | all = true; | |
4169 | ||
9ebb03ad | 4170 | lxc_list_for_each_safe(it, &c->cgroup, next) { |
72d0e1cb SG |
4171 | struct lxc_cgroup *cg = it->elem; |
4172 | if (!all && strcmp(cg->subsystem, k) != 0) | |
4173 | continue; | |
4174 | lxc_list_del(it); | |
4175 | free(cg->subsystem); | |
4176 | free(cg->value); | |
4177 | free(cg); | |
4178 | free(it); | |
4179 | } | |
4180 | return 0; | |
4181 | } | |
4182 | ||
ee1e7aa0 SG |
4183 | int lxc_clear_groups(struct lxc_conf *c) |
4184 | { | |
4185 | struct lxc_list *it,*next; | |
4186 | ||
4187 | lxc_list_for_each_safe(it, &c->groups, next) { | |
4188 | lxc_list_del(it); | |
4189 | free(it->elem); | |
4190 | free(it); | |
4191 | } | |
4192 | return 0; | |
4193 | } | |
4194 | ||
ab799c0b SG |
4195 | int lxc_clear_environment(struct lxc_conf *c) |
4196 | { | |
4197 | struct lxc_list *it,*next; | |
4198 | ||
4199 | lxc_list_for_each_safe(it, &c->environment, next) { | |
4200 | lxc_list_del(it); | |
4201 | free(it->elem); | |
4202 | free(it); | |
4203 | } | |
4204 | return 0; | |
4205 | } | |
4206 | ||
4207 | ||
72d0e1cb SG |
4208 | int lxc_clear_mount_entries(struct lxc_conf *c) |
4209 | { | |
9ebb03ad | 4210 | struct lxc_list *it,*next; |
72d0e1cb | 4211 | |
9ebb03ad | 4212 | lxc_list_for_each_safe(it, &c->mount_list, next) { |
72d0e1cb SG |
4213 | lxc_list_del(it); |
4214 | free(it->elem); | |
4215 | free(it); | |
4216 | } | |
4217 | return 0; | |
4218 | } | |
4219 | ||
b099e9e9 SH |
4220 | int lxc_clear_automounts(struct lxc_conf *c) |
4221 | { | |
4222 | c->auto_mounts = 0; | |
4223 | return 0; | |
4224 | } | |
4225 | ||
12a50cc6 | 4226 | int lxc_clear_hooks(struct lxc_conf *c, const char *key) |
72d0e1cb | 4227 | { |
9ebb03ad | 4228 | struct lxc_list *it,*next; |
17ed13a3 | 4229 | bool all = false, done = false; |
12a50cc6 | 4230 | const char *k = key + 9; |
72d0e1cb SG |
4231 | int i; |
4232 | ||
17ed13a3 SH |
4233 | if (strcmp(key, "lxc.hook") == 0) |
4234 | all = true; | |
4235 | ||
72d0e1cb | 4236 | for (i=0; i<NUM_LXC_HOOKS; i++) { |
17ed13a3 | 4237 | if (all || strcmp(k, lxchook_names[i]) == 0) { |
9ebb03ad | 4238 | lxc_list_for_each_safe(it, &c->hooks[i], next) { |
17ed13a3 SH |
4239 | lxc_list_del(it); |
4240 | free(it->elem); | |
4241 | free(it); | |
4242 | } | |
4243 | done = true; | |
72d0e1cb SG |
4244 | } |
4245 | } | |
17ed13a3 SH |
4246 | |
4247 | if (!done) { | |
4248 | ERROR("Invalid hook key: %s", key); | |
4249 | return -1; | |
4250 | } | |
72d0e1cb SG |
4251 | return 0; |
4252 | } | |
8eb5694b | 4253 | |
74a3920a | 4254 | static void lxc_clear_saved_nics(struct lxc_conf *conf) |
7b35f3d6 SH |
4255 | { |
4256 | int i; | |
4257 | ||
0cf45501 | 4258 | if (!conf->saved_nics) |
7b35f3d6 SH |
4259 | return; |
4260 | for (i=0; i < conf->num_savednics; i++) | |
4261 | free(conf->saved_nics[i].orig_name); | |
7b35f3d6 SH |
4262 | free(conf->saved_nics); |
4263 | } | |
4264 | ||
4184c3e1 SH |
4265 | static inline void lxc_clear_aliens(struct lxc_conf *conf) |
4266 | { | |
4267 | struct lxc_list *it,*next; | |
4268 | ||
4269 | lxc_list_for_each_safe(it, &conf->aliens, next) { | |
4270 | lxc_list_del(it); | |
4271 | free(it->elem); | |
4272 | free(it); | |
4273 | } | |
4274 | } | |
4275 | ||
f979ac15 SH |
4276 | static inline void lxc_clear_includes(struct lxc_conf *conf) |
4277 | { | |
4278 | struct lxc_list *it,*next; | |
4279 | ||
4280 | lxc_list_for_each_safe(it, &conf->includes, next) { | |
4281 | lxc_list_del(it); | |
4282 | free(it->elem); | |
4283 | free(it); | |
4284 | } | |
4285 | } | |
4286 | ||
8eb5694b SH |
4287 | void lxc_conf_free(struct lxc_conf *conf) |
4288 | { | |
4289 | if (!conf) | |
4290 | return; | |
858377e4 SH |
4291 | if (current_config == conf) |
4292 | current_config = NULL; | |
f10fad2f ME |
4293 | free(conf->console.log_path); |
4294 | free(conf->console.path); | |
4295 | free(conf->rootfs.mount); | |
b3b8c97f | 4296 | free(conf->rootfs.bdev_type); |
f10fad2f ME |
4297 | free(conf->rootfs.options); |
4298 | free(conf->rootfs.path); | |
f10fad2f | 4299 | free(conf->logfile); |
858377e4 SH |
4300 | if (conf->logfd != -1) |
4301 | close(conf->logfd); | |
f10fad2f ME |
4302 | free(conf->utsname); |
4303 | free(conf->ttydir); | |
4304 | free(conf->fstab); | |
4305 | free(conf->rcfile); | |
4306 | free(conf->init_cmd); | |
6b0d5538 | 4307 | free(conf->unexpanded_config); |
393903d1 | 4308 | free(conf->pty_names); |
76d0127f | 4309 | free(conf->syslog); |
8eb5694b | 4310 | lxc_clear_config_network(conf); |
f10fad2f ME |
4311 | free(conf->lsm_aa_profile); |
4312 | free(conf->lsm_se_context); | |
769872f9 | 4313 | lxc_seccomp_free(conf); |
8eb5694b | 4314 | lxc_clear_config_caps(conf); |
1fb86a7c | 4315 | lxc_clear_config_keepcaps(conf); |
8eb5694b | 4316 | lxc_clear_cgroups(conf, "lxc.cgroup"); |
17ed13a3 | 4317 | lxc_clear_hooks(conf, "lxc.hook"); |
8eb5694b | 4318 | lxc_clear_mount_entries(conf); |
7b35f3d6 | 4319 | lxc_clear_saved_nics(conf); |
27c27d73 | 4320 | lxc_clear_idmaps(conf); |
ee1e7aa0 | 4321 | lxc_clear_groups(conf); |
f979ac15 | 4322 | lxc_clear_includes(conf); |
761d81ca | 4323 | lxc_clear_aliens(conf); |
ab799c0b | 4324 | lxc_clear_environment(conf); |
8eb5694b SH |
4325 | free(conf); |
4326 | } | |
4355ab5f SH |
4327 | |
4328 | struct userns_fn_data { | |
4329 | int (*fn)(void *); | |
4330 | void *arg; | |
4331 | int p[2]; | |
4332 | }; | |
4333 | ||
4334 | static int run_userns_fn(void *data) | |
4335 | { | |
4336 | struct userns_fn_data *d = data; | |
4337 | char c; | |
4338 | // we're not sharing with the parent any more, if it was a thread | |
4339 | ||
4340 | close(d->p[1]); | |
4341 | if (read(d->p[0], &c, 1) != 1) | |
4342 | return -1; | |
4343 | close(d->p[0]); | |
4344 | return d->fn(d->arg); | |
4345 | } | |
4346 | ||
4347 | /* | |
8b227008 TS |
4348 | * Add ID_TYPE_UID/ID_TYPE_GID entries to an existing lxc_conf, |
4349 | * if they are not already there. | |
4355ab5f | 4350 | */ |
8b227008 TS |
4351 | static struct lxc_list *idmap_add_id(struct lxc_conf *conf, |
4352 | uid_t uid, gid_t gid) | |
4355ab5f | 4353 | { |
8b227008 TS |
4354 | int hostuid_mapped = mapped_hostid(uid, conf, ID_TYPE_UID); |
4355 | int hostgid_mapped = mapped_hostid(gid, conf, ID_TYPE_GID); | |
4355ab5f SH |
4356 | struct lxc_list *new = NULL, *tmp, *it, *next; |
4357 | struct id_map *entry; | |
4358 | ||
3ec1648d SH |
4359 | new = malloc(sizeof(*new)); |
4360 | if (!new) { | |
4361 | ERROR("Out of memory building id map"); | |
4362 | return NULL; | |
4363 | } | |
4364 | lxc_list_init(new); | |
4365 | ||
8b227008 TS |
4366 | if (hostuid_mapped < 0) { |
4367 | hostuid_mapped = find_unmapped_nsuid(conf, ID_TYPE_UID); | |
4368 | if (hostuid_mapped < 0) | |
3ec1648d SH |
4369 | goto err; |
4370 | tmp = malloc(sizeof(*tmp)); | |
4371 | if (!tmp) | |
4372 | goto err; | |
4355ab5f SH |
4373 | entry = malloc(sizeof(*entry)); |
4374 | if (!entry) { | |
3ec1648d SH |
4375 | free(tmp); |
4376 | goto err; | |
4355ab5f | 4377 | } |
3ec1648d | 4378 | tmp->elem = entry; |
4355ab5f | 4379 | entry->idtype = ID_TYPE_UID; |
8b227008 TS |
4380 | entry->nsid = hostuid_mapped; |
4381 | entry->hostid = (unsigned long) uid; | |
4382 | entry->range = 1; | |
4383 | lxc_list_add_tail(new, tmp); | |
4384 | } | |
4385 | if (hostgid_mapped < 0) { | |
4386 | hostgid_mapped = find_unmapped_nsuid(conf, ID_TYPE_GID); | |
4387 | if (hostgid_mapped < 0) | |
4388 | goto err; | |
4389 | tmp = malloc(sizeof(*tmp)); | |
4390 | if (!tmp) | |
4391 | goto err; | |
4392 | entry = malloc(sizeof(*entry)); | |
4393 | if (!entry) { | |
4394 | free(tmp); | |
4395 | goto err; | |
4396 | } | |
4397 | tmp->elem = entry; | |
4398 | entry->idtype = ID_TYPE_GID; | |
4399 | entry->nsid = hostgid_mapped; | |
4400 | entry->hostid = (unsigned long) gid; | |
4355ab5f | 4401 | entry->range = 1; |
3ec1648d | 4402 | lxc_list_add_tail(new, tmp); |
4355ab5f SH |
4403 | } |
4404 | lxc_list_for_each_safe(it, &conf->id_map, next) { | |
4405 | tmp = malloc(sizeof(*tmp)); | |
4406 | if (!tmp) | |
4407 | goto err; | |
4408 | entry = malloc(sizeof(*entry)); | |
4409 | if (!entry) { | |
4410 | free(tmp); | |
4411 | goto err; | |
4412 | } | |
4413 | memset(entry, 0, sizeof(*entry)); | |
4414 | memcpy(entry, it->elem, sizeof(*entry)); | |
4415 | tmp->elem = entry; | |
3ec1648d | 4416 | lxc_list_add_tail(new, tmp); |
4355ab5f SH |
4417 | } |
4418 | ||
4419 | return new; | |
4420 | ||
4421 | err: | |
8b227008 | 4422 | ERROR("Out of memory building a new uid/gid map"); |
908fde6a SH |
4423 | if (new) |
4424 | lxc_free_idmap(new); | |
c30ac545 | 4425 | free(new); |
4355ab5f SH |
4426 | return NULL; |
4427 | } | |
4428 | ||
4429 | /* | |
4430 | * Run a function in a new user namespace. | |
8b227008 | 4431 | * The caller's euid/egid will be mapped in if it is not already. |
4355ab5f SH |
4432 | */ |
4433 | int userns_exec_1(struct lxc_conf *conf, int (*fn)(void *), void *data) | |
4434 | { | |
4435 | int ret, pid; | |
4436 | struct userns_fn_data d; | |
4437 | char c = '1'; | |
4438 | int p[2]; | |
4439 | struct lxc_list *idmap; | |
4440 | ||
4355ab5f | 4441 | ret = pipe(p); |
4355ab5f SH |
4442 | if (ret < 0) { |
4443 | SYSERROR("opening pipe"); | |
4444 | return -1; | |
4445 | } | |
4446 | d.fn = fn; | |
4447 | d.arg = data; | |
4448 | d.p[0] = p[0]; | |
4449 | d.p[1] = p[1]; | |
4450 | pid = lxc_clone(run_userns_fn, &d, CLONE_NEWUSER); | |
4451 | if (pid < 0) | |
4452 | goto err; | |
4355ab5f | 4453 | close(p[0]); |
4355ab5f SH |
4454 | p[0] = -1; |
4455 | ||
8b227008 TS |
4456 | if ((idmap = idmap_add_id(conf, geteuid(), getegid())) == NULL) { |
4457 | ERROR("Error adding self to container uid/gid map"); | |
4355ab5f SH |
4458 | goto err; |
4459 | } | |
4460 | ||
4461 | ret = lxc_map_ids(idmap, pid); | |
4462 | lxc_free_idmap(idmap); | |
88dd66fc | 4463 | free(idmap); |
565e571c | 4464 | if (ret) { |
4355ab5f SH |
4465 | ERROR("Error setting up child mappings"); |
4466 | goto err; | |
4467 | } | |
4468 | ||
4469 | // kick the child | |
4470 | if (write(p[1], &c, 1) != 1) { | |
4471 | SYSERROR("writing to pipe to child"); | |
4472 | goto err; | |
4473 | } | |
4474 | ||
3139aead SG |
4475 | ret = wait_for_pid(pid); |
4476 | ||
4477 | close(p[1]); | |
4478 | return ret; | |
4479 | ||
4355ab5f | 4480 | err: |
4355ab5f SH |
4481 | if (p[0] != -1) |
4482 | close(p[0]); | |
4483 | close(p[1]); | |
4355ab5f SH |
4484 | return -1; |
4485 | } | |
97e9cfa0 | 4486 | |
a96a8e8c | 4487 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4488 | static char* getuname(void) |
4489 | { | |
a96a8e8c | 4490 | struct passwd *result; |
97e9cfa0 | 4491 | |
a96a8e8c SH |
4492 | result = getpwuid(geteuid()); |
4493 | if (!result) | |
97e9cfa0 SH |
4494 | return NULL; |
4495 | ||
a96a8e8c | 4496 | return strdup(result->pw_name); |
97e9cfa0 SH |
4497 | } |
4498 | ||
a96a8e8c | 4499 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4500 | static char *getgname(void) |
4501 | { | |
a96a8e8c | 4502 | struct group *result; |
97e9cfa0 | 4503 | |
a96a8e8c SH |
4504 | result = getgrgid(getegid()); |
4505 | if (!result) | |
97e9cfa0 SH |
4506 | return NULL; |
4507 | ||
a96a8e8c | 4508 | return strdup(result->gr_name); |
97e9cfa0 SH |
4509 | } |
4510 | ||
a96a8e8c | 4511 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4512 | void suggest_default_idmap(void) |
4513 | { | |
4514 | FILE *f; | |
4515 | unsigned int uid = 0, urange = 0, gid = 0, grange = 0; | |
4516 | char *line = NULL; | |
4517 | char *uname, *gname; | |
4518 | size_t len = 0; | |
4519 | ||
4520 | if (!(uname = getuname())) | |
4521 | return; | |
4522 | ||
4523 | if (!(gname = getgname())) { | |
4524 | free(uname); | |
4525 | return; | |
4526 | } | |
4527 | ||
4528 | f = fopen(subuidfile, "r"); | |
4529 | if (!f) { | |
4530 | ERROR("Your system is not configured with subuids"); | |
4531 | free(gname); | |
4532 | free(uname); | |
4533 | return; | |
4534 | } | |
4535 | while (getline(&line, &len, f) != -1) { | |
b7930180 | 4536 | size_t no_newline = 0; |
97e9cfa0 SH |
4537 | char *p = strchr(line, ':'), *p2; |
4538 | if (*line == '#') | |
4539 | continue; | |
4540 | if (!p) | |
4541 | continue; | |
4542 | *p = '\0'; | |
4543 | p++; | |
4544 | if (strcmp(line, uname)) | |
4545 | continue; | |
4546 | p2 = strchr(p, ':'); | |
4547 | if (!p2) | |
4548 | continue; | |
4549 | *p2 = '\0'; | |
4550 | p2++; | |
4551 | if (!*p2) | |
4552 | continue; | |
b7930180 CB |
4553 | no_newline = strcspn(p2, "\n"); |
4554 | p2[no_newline] = '\0'; | |
4555 | ||
b7b2fde4 CB |
4556 | if (lxc_safe_uint(p, &uid) < 0) |
4557 | WARN("Could not parse UID."); | |
4558 | if (lxc_safe_uint(p2, &urange) < 0) | |
4559 | WARN("Could not parse UID range."); | |
97e9cfa0 SH |
4560 | } |
4561 | fclose(f); | |
4562 | ||
4563 | f = fopen(subuidfile, "r"); | |
4564 | if (!f) { | |
4565 | ERROR("Your system is not configured with subgids"); | |
4566 | free(gname); | |
4567 | free(uname); | |
4568 | return; | |
4569 | } | |
4570 | while (getline(&line, &len, f) != -1) { | |
b7930180 | 4571 | size_t no_newline = 0; |
97e9cfa0 SH |
4572 | char *p = strchr(line, ':'), *p2; |
4573 | if (*line == '#') | |
4574 | continue; | |
4575 | if (!p) | |
4576 | continue; | |
4577 | *p = '\0'; | |
4578 | p++; | |
4579 | if (strcmp(line, uname)) | |
4580 | continue; | |
4581 | p2 = strchr(p, ':'); | |
4582 | if (!p2) | |
4583 | continue; | |
4584 | *p2 = '\0'; | |
4585 | p2++; | |
4586 | if (!*p2) | |
4587 | continue; | |
b7930180 CB |
4588 | no_newline = strcspn(p2, "\n"); |
4589 | p2[no_newline] = '\0'; | |
4590 | ||
b7b2fde4 CB |
4591 | if (lxc_safe_uint(p, &gid) < 0) |
4592 | WARN("Could not parse GID."); | |
4593 | if (lxc_safe_uint(p2, &grange) < 0) | |
4594 | WARN("Could not parse GID range."); | |
97e9cfa0 SH |
4595 | } |
4596 | fclose(f); | |
4597 | ||
f10fad2f | 4598 | free(line); |
97e9cfa0 SH |
4599 | |
4600 | if (!urange || !grange) { | |
4601 | ERROR("You do not have subuids or subgids allocated"); | |
4602 | ERROR("Unprivileged containers require subuids and subgids"); | |
4603 | return; | |
4604 | } | |
4605 | ||
4606 | ERROR("You must either run as root, or define uid mappings"); | |
4607 | ERROR("To pass uid mappings to lxc-create, you could create"); | |
4608 | ERROR("~/.config/lxc/default.conf:"); | |
4609 | ERROR("lxc.include = %s", LXC_DEFAULT_CONFIG); | |
4610 | ERROR("lxc.id_map = u 0 %u %u", uid, urange); | |
4611 | ERROR("lxc.id_map = g 0 %u %u", gid, grange); | |
4612 | ||
4613 | free(gname); | |
4614 | free(uname); | |
4615 | } | |
aaf26830 | 4616 | |
a7307747 SH |
4617 | static void free_cgroup_settings(struct lxc_list *result) |
4618 | { | |
4619 | struct lxc_list *iterator, *next; | |
4620 | ||
4621 | lxc_list_for_each_safe(iterator, result, next) { | |
4622 | lxc_list_del(iterator); | |
4623 | free(iterator); | |
4624 | } | |
4625 | free(result); | |
4626 | } | |
4627 | ||
aaf26830 KT |
4628 | /* |
4629 | * Return the list of cgroup_settings sorted according to the following rules | |
4630 | * 1. Put memory.limit_in_bytes before memory.memsw.limit_in_bytes | |
4631 | */ | |
4632 | struct lxc_list *sort_cgroup_settings(struct lxc_list* cgroup_settings) | |
4633 | { | |
4634 | struct lxc_list *result; | |
4635 | struct lxc_list *memsw_limit = NULL; | |
4636 | struct lxc_list *it = NULL; | |
4637 | struct lxc_cgroup *cg = NULL; | |
4638 | struct lxc_list *item = NULL; | |
4639 | ||
4640 | result = malloc(sizeof(*result)); | |
fac7c663 KT |
4641 | if (!result) { |
4642 | ERROR("failed to allocate memory to sort cgroup settings"); | |
4643 | return NULL; | |
4644 | } | |
aaf26830 KT |
4645 | lxc_list_init(result); |
4646 | ||
4647 | /*Iterate over the cgroup settings and copy them to the output list*/ | |
4648 | lxc_list_for_each(it, cgroup_settings) { | |
4649 | item = malloc(sizeof(*item)); | |
fac7c663 KT |
4650 | if (!item) { |
4651 | ERROR("failed to allocate memory to sort cgroup settings"); | |
a7307747 | 4652 | free_cgroup_settings(result); |
fac7c663 KT |
4653 | return NULL; |
4654 | } | |
aaf26830 KT |
4655 | item->elem = it->elem; |
4656 | cg = it->elem; | |
4657 | if (strcmp(cg->subsystem, "memory.memsw.limit_in_bytes") == 0) { | |
4658 | /* Store the memsw_limit location */ | |
4659 | memsw_limit = item; | |
4660 | } else if (strcmp(cg->subsystem, "memory.limit_in_bytes") == 0 && memsw_limit != NULL) { | |
4d5b72a1 | 4661 | /* lxc.cgroup.memory.memsw.limit_in_bytes is found before |
aaf26830 KT |
4662 | * lxc.cgroup.memory.limit_in_bytes, swap these two items */ |
4663 | item->elem = memsw_limit->elem; | |
4664 | memsw_limit->elem = it->elem; | |
4665 | } | |
4666 | lxc_list_add_tail(result, item); | |
4667 | } | |
4668 | ||
4669 | return result; | |
a7307747 | 4670 | } |