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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 | */ |
d06245b8 NC |
23 | #include "config.h" |
24 | ||
0ad19a3f | 25 | #include <stdio.h> |
0ad19a3f | 26 | #include <stdlib.h> |
e3b4c4c4 | 27 | #include <stdarg.h> |
0ad19a3f | 28 | #include <errno.h> |
29 | #include <string.h> | |
30 | #include <dirent.h> | |
0ad19a3f | 31 | #include <unistd.h> |
bc6928ff | 32 | #include <inttypes.h> |
e3b4c4c4 | 33 | #include <sys/wait.h> |
2d76d1d7 | 34 | #include <sys/syscall.h> |
97e9cfa0 SH |
35 | #include <sys/types.h> |
36 | #include <pwd.h> | |
37 | #include <grp.h> | |
4a0ba80d | 38 | #include <time.h> |
614305f3 | 39 | #ifdef HAVE_STATVFS |
2938f7c8 | 40 | #include <sys/statvfs.h> |
614305f3 | 41 | #endif |
e827ff7e SG |
42 | |
43 | #if HAVE_PTY_H | |
b0a33c1e | 44 | #include <pty.h> |
e827ff7e SG |
45 | #else |
46 | #include <../include/openpty.h> | |
47 | #endif | |
0ad19a3f | 48 | |
b3ecde1e DL |
49 | #include <linux/loop.h> |
50 | ||
0ad19a3f | 51 | #include <sys/types.h> |
52 | #include <sys/utsname.h> | |
53 | #include <sys/param.h> | |
54 | #include <sys/stat.h> | |
55 | #include <sys/socket.h> | |
56 | #include <sys/mount.h> | |
57 | #include <sys/mman.h> | |
81810dd1 | 58 | #include <sys/prctl.h> |
0ad19a3f | 59 | |
60 | #include <arpa/inet.h> | |
61 | #include <fcntl.h> | |
62 | #include <netinet/in.h> | |
63 | #include <net/if.h> | |
6f4a3756 | 64 | #include <libgen.h> |
0ad19a3f | 65 | |
e5bda9ee | 66 | #include "network.h" |
67 | #include "error.h" | |
e8bd4e43 | 68 | #include "af_unix.h" |
b2718c72 | 69 | #include "parse.h" |
1b09f2c0 DL |
70 | #include "utils.h" |
71 | #include "conf.h" | |
72 | #include "log.h" | |
d55bc1ad | 73 | #include "caps.h" /* for lxc_caps_last_cap() */ |
9be53773 | 74 | #include "bdev.h" |
368bbc02 | 75 | #include "cgroup.h" |
025ed0f3 | 76 | #include "lxclock.h" |
4355ab5f | 77 | #include "namespace.h" |
fe4de9a6 | 78 | #include "lsm/lsm.h" |
d0a36f2c | 79 | |
495d2046 SG |
80 | #if HAVE_SYS_CAPABILITY_H |
81 | #include <sys/capability.h> | |
82 | #endif | |
83 | ||
6ff05e18 SG |
84 | #if HAVE_SYS_PERSONALITY_H |
85 | #include <sys/personality.h> | |
86 | #endif | |
87 | ||
edaf8b1b SG |
88 | #if IS_BIONIC |
89 | #include <../include/lxcmntent.h> | |
90 | #else | |
91 | #include <mntent.h> | |
92 | #endif | |
93 | ||
769872f9 SH |
94 | #include "lxcseccomp.h" |
95 | ||
36eb9bde | 96 | lxc_log_define(lxc_conf, lxc); |
e5bda9ee | 97 | |
87da4ec3 | 98 | #define LINELEN 4096 |
0ad19a3f | 99 | |
495d2046 | 100 | #if HAVE_SYS_CAPABILITY_H |
b09094da MN |
101 | #ifndef CAP_SETFCAP |
102 | #define CAP_SETFCAP 31 | |
103 | #endif | |
104 | ||
105 | #ifndef CAP_MAC_OVERRIDE | |
106 | #define CAP_MAC_OVERRIDE 32 | |
107 | #endif | |
108 | ||
109 | #ifndef CAP_MAC_ADMIN | |
110 | #define CAP_MAC_ADMIN 33 | |
111 | #endif | |
495d2046 | 112 | #endif |
b09094da MN |
113 | |
114 | #ifndef PR_CAPBSET_DROP | |
115 | #define PR_CAPBSET_DROP 24 | |
116 | #endif | |
117 | ||
9818cae4 SG |
118 | #ifndef LO_FLAGS_AUTOCLEAR |
119 | #define LO_FLAGS_AUTOCLEAR 4 | |
120 | #endif | |
121 | ||
0769b82a CS |
122 | /* needed for cgroup automount checks, regardless of whether we |
123 | * have included linux/capability.h or not */ | |
124 | #ifndef CAP_SYS_ADMIN | |
125 | #define CAP_SYS_ADMIN 21 | |
126 | #endif | |
127 | ||
2d76d1d7 SG |
128 | /* Define pivot_root() if missing from the C library */ |
129 | #ifndef HAVE_PIVOT_ROOT | |
130 | static int pivot_root(const char * new_root, const char * put_old) | |
131 | { | |
132 | #ifdef __NR_pivot_root | |
133 | return syscall(__NR_pivot_root, new_root, put_old); | |
134 | #else | |
135 | errno = ENOSYS; | |
136 | return -1; | |
137 | #endif | |
138 | } | |
139 | #else | |
140 | extern int pivot_root(const char * new_root, const char * put_old); | |
141 | #endif | |
142 | ||
143 | /* Define sethostname() if missing from the C library */ | |
144 | #ifndef HAVE_SETHOSTNAME | |
145 | static int sethostname(const char * name, size_t len) | |
146 | { | |
147 | #ifdef __NR_sethostname | |
148 | return syscall(__NR_sethostname, name, len); | |
149 | #else | |
150 | errno = ENOSYS; | |
151 | return -1; | |
152 | #endif | |
153 | } | |
154 | #endif | |
155 | ||
72f919c4 SG |
156 | /* Define __S_ISTYPE if missing from the C library */ |
157 | #ifndef __S_ISTYPE | |
158 | #define __S_ISTYPE(mode, mask) (((mode) & S_IFMT) == (mask)) | |
159 | #endif | |
160 | ||
ecec0126 SG |
161 | #ifndef MS_PRIVATE |
162 | #define MS_PRIVATE (1<<18) | |
163 | #endif | |
164 | ||
72d0e1cb | 165 | char *lxchook_names[NUM_LXC_HOOKS] = { |
37cf711b | 166 | "pre-start", "pre-mount", "mount", "autodev", "start", "post-stop", "clone", "destroy" }; |
72d0e1cb | 167 | |
a589434e | 168 | typedef int (*instantiate_cb)(struct lxc_handler *, struct lxc_netdev *); |
0ad19a3f | 169 | |
998ac676 RT |
170 | struct mount_opt { |
171 | char *name; | |
172 | int clear; | |
173 | int flag; | |
174 | }; | |
175 | ||
81810dd1 DL |
176 | struct caps_opt { |
177 | char *name; | |
178 | int value; | |
179 | }; | |
180 | ||
858377e4 SH |
181 | /* |
182 | * The lxc_conf of the container currently being worked on in an | |
183 | * API call | |
184 | * This is used in the error calls | |
185 | */ | |
186 | #ifdef HAVE_TLS | |
187 | __thread struct lxc_conf *current_config; | |
188 | #else | |
189 | struct lxc_conf *current_config; | |
190 | #endif | |
191 | ||
0769b82a CS |
192 | /* Declare this here, since we don't want to reshuffle the whole file. */ |
193 | static int in_caplist(int cap, struct lxc_list *caps); | |
194 | ||
a589434e JN |
195 | static int instantiate_veth(struct lxc_handler *, struct lxc_netdev *); |
196 | static int instantiate_macvlan(struct lxc_handler *, struct lxc_netdev *); | |
197 | static int instantiate_vlan(struct lxc_handler *, struct lxc_netdev *); | |
198 | static int instantiate_phys(struct lxc_handler *, struct lxc_netdev *); | |
199 | static int instantiate_empty(struct lxc_handler *, struct lxc_netdev *); | |
200 | static int instantiate_none(struct lxc_handler *, struct lxc_netdev *); | |
201 | ||
202 | static instantiate_cb netdev_conf[LXC_NET_MAXCONFTYPE + 1] = { | |
203 | [LXC_NET_VETH] = instantiate_veth, | |
204 | [LXC_NET_MACVLAN] = instantiate_macvlan, | |
205 | [LXC_NET_VLAN] = instantiate_vlan, | |
206 | [LXC_NET_PHYS] = instantiate_phys, | |
207 | [LXC_NET_EMPTY] = instantiate_empty, | |
208 | [LXC_NET_NONE] = instantiate_none, | |
0ad19a3f | 209 | }; |
210 | ||
74a2b586 JK |
211 | static int shutdown_veth(struct lxc_handler *, struct lxc_netdev *); |
212 | static int shutdown_macvlan(struct lxc_handler *, struct lxc_netdev *); | |
213 | static int shutdown_vlan(struct lxc_handler *, struct lxc_netdev *); | |
214 | static int shutdown_phys(struct lxc_handler *, struct lxc_netdev *); | |
215 | static int shutdown_empty(struct lxc_handler *, struct lxc_netdev *); | |
26b797f3 | 216 | static int shutdown_none(struct lxc_handler *, struct lxc_netdev *); |
74a2b586 | 217 | |
a589434e | 218 | static instantiate_cb netdev_deconf[LXC_NET_MAXCONFTYPE + 1] = { |
74a2b586 JK |
219 | [LXC_NET_VETH] = shutdown_veth, |
220 | [LXC_NET_MACVLAN] = shutdown_macvlan, | |
221 | [LXC_NET_VLAN] = shutdown_vlan, | |
222 | [LXC_NET_PHYS] = shutdown_phys, | |
223 | [LXC_NET_EMPTY] = shutdown_empty, | |
26b797f3 | 224 | [LXC_NET_NONE] = shutdown_none, |
74a2b586 JK |
225 | }; |
226 | ||
998ac676 | 227 | static struct mount_opt mount_opt[] = { |
88d413d5 SW |
228 | { "defaults", 0, 0 }, |
229 | { "ro", 0, MS_RDONLY }, | |
230 | { "rw", 1, MS_RDONLY }, | |
231 | { "suid", 1, MS_NOSUID }, | |
232 | { "nosuid", 0, MS_NOSUID }, | |
233 | { "dev", 1, MS_NODEV }, | |
234 | { "nodev", 0, MS_NODEV }, | |
235 | { "exec", 1, MS_NOEXEC }, | |
236 | { "noexec", 0, MS_NOEXEC }, | |
237 | { "sync", 0, MS_SYNCHRONOUS }, | |
238 | { "async", 1, MS_SYNCHRONOUS }, | |
239 | { "dirsync", 0, MS_DIRSYNC }, | |
240 | { "remount", 0, MS_REMOUNT }, | |
241 | { "mand", 0, MS_MANDLOCK }, | |
242 | { "nomand", 1, MS_MANDLOCK }, | |
243 | { "atime", 1, MS_NOATIME }, | |
244 | { "noatime", 0, MS_NOATIME }, | |
245 | { "diratime", 1, MS_NODIRATIME }, | |
246 | { "nodiratime", 0, MS_NODIRATIME }, | |
247 | { "bind", 0, MS_BIND }, | |
248 | { "rbind", 0, MS_BIND|MS_REC }, | |
249 | { "relatime", 0, MS_RELATIME }, | |
250 | { "norelatime", 1, MS_RELATIME }, | |
251 | { "strictatime", 0, MS_STRICTATIME }, | |
252 | { "nostrictatime", 1, MS_STRICTATIME }, | |
253 | { NULL, 0, 0 }, | |
998ac676 RT |
254 | }; |
255 | ||
495d2046 | 256 | #if HAVE_SYS_CAPABILITY_H |
81810dd1 | 257 | static struct caps_opt caps_opt[] = { |
a6afdde9 | 258 | { "chown", CAP_CHOWN }, |
1e11be34 DL |
259 | { "dac_override", CAP_DAC_OVERRIDE }, |
260 | { "dac_read_search", CAP_DAC_READ_SEARCH }, | |
261 | { "fowner", CAP_FOWNER }, | |
262 | { "fsetid", CAP_FSETID }, | |
81810dd1 DL |
263 | { "kill", CAP_KILL }, |
264 | { "setgid", CAP_SETGID }, | |
265 | { "setuid", CAP_SETUID }, | |
266 | { "setpcap", CAP_SETPCAP }, | |
267 | { "linux_immutable", CAP_LINUX_IMMUTABLE }, | |
268 | { "net_bind_service", CAP_NET_BIND_SERVICE }, | |
269 | { "net_broadcast", CAP_NET_BROADCAST }, | |
270 | { "net_admin", CAP_NET_ADMIN }, | |
271 | { "net_raw", CAP_NET_RAW }, | |
272 | { "ipc_lock", CAP_IPC_LOCK }, | |
273 | { "ipc_owner", CAP_IPC_OWNER }, | |
274 | { "sys_module", CAP_SYS_MODULE }, | |
275 | { "sys_rawio", CAP_SYS_RAWIO }, | |
276 | { "sys_chroot", CAP_SYS_CHROOT }, | |
277 | { "sys_ptrace", CAP_SYS_PTRACE }, | |
278 | { "sys_pacct", CAP_SYS_PACCT }, | |
279 | { "sys_admin", CAP_SYS_ADMIN }, | |
280 | { "sys_boot", CAP_SYS_BOOT }, | |
281 | { "sys_nice", CAP_SYS_NICE }, | |
282 | { "sys_resource", CAP_SYS_RESOURCE }, | |
283 | { "sys_time", CAP_SYS_TIME }, | |
284 | { "sys_tty_config", CAP_SYS_TTY_CONFIG }, | |
285 | { "mknod", CAP_MKNOD }, | |
286 | { "lease", CAP_LEASE }, | |
57b837e2 CB |
287 | #ifdef CAP_AUDIT_READ |
288 | { "audit_read", CAP_AUDIT_READ }, | |
289 | #endif | |
9527e566 | 290 | #ifdef CAP_AUDIT_WRITE |
81810dd1 | 291 | { "audit_write", CAP_AUDIT_WRITE }, |
9527e566 FW |
292 | #endif |
293 | #ifdef CAP_AUDIT_CONTROL | |
81810dd1 | 294 | { "audit_control", CAP_AUDIT_CONTROL }, |
9527e566 | 295 | #endif |
81810dd1 DL |
296 | { "setfcap", CAP_SETFCAP }, |
297 | { "mac_override", CAP_MAC_OVERRIDE }, | |
298 | { "mac_admin", CAP_MAC_ADMIN }, | |
5170c716 CS |
299 | #ifdef CAP_SYSLOG |
300 | { "syslog", CAP_SYSLOG }, | |
301 | #endif | |
302 | #ifdef CAP_WAKE_ALARM | |
303 | { "wake_alarm", CAP_WAKE_ALARM }, | |
304 | #endif | |
2b54359b CB |
305 | #ifdef CAP_BLOCK_SUSPEND |
306 | { "block_suspend", CAP_BLOCK_SUSPEND }, | |
307 | #endif | |
81810dd1 | 308 | }; |
495d2046 SG |
309 | #else |
310 | static struct caps_opt caps_opt[] = {}; | |
311 | #endif | |
81810dd1 | 312 | |
91c3830e SH |
313 | static int run_buffer(char *buffer) |
314 | { | |
ebec9176 | 315 | struct lxc_popen_FILE *f; |
91c3830e | 316 | char *output; |
8e7da691 | 317 | int ret; |
91c3830e | 318 | |
ebec9176 | 319 | f = lxc_popen(buffer); |
91c3830e SH |
320 | if (!f) { |
321 | SYSERROR("popen failed"); | |
322 | return -1; | |
323 | } | |
324 | ||
325 | output = malloc(LXC_LOG_BUFFER_SIZE); | |
326 | if (!output) { | |
327 | ERROR("failed to allocate memory for script output"); | |
ebec9176 | 328 | lxc_pclose(f); |
91c3830e SH |
329 | return -1; |
330 | } | |
331 | ||
ebec9176 | 332 | while(fgets(output, LXC_LOG_BUFFER_SIZE, f->f)) |
91c3830e SH |
333 | DEBUG("script output: %s", output); |
334 | ||
335 | free(output); | |
336 | ||
ebec9176 | 337 | ret = lxc_pclose(f); |
8e7da691 | 338 | if (ret == -1) { |
91c3830e SH |
339 | SYSERROR("Script exited on error"); |
340 | return -1; | |
8e7da691 DE |
341 | } else if (WIFEXITED(ret) && WEXITSTATUS(ret) != 0) { |
342 | ERROR("Script exited with status %d", WEXITSTATUS(ret)); | |
343 | return -1; | |
344 | } else if (WIFSIGNALED(ret)) { | |
345 | ERROR("Script terminated by signal %d (%s)", WTERMSIG(ret), | |
346 | strsignal(WTERMSIG(ret))); | |
347 | return -1; | |
91c3830e SH |
348 | } |
349 | ||
350 | return 0; | |
351 | } | |
352 | ||
148e91f5 | 353 | static int run_script_argv(const char *name, const char *section, |
283678ed SH |
354 | const char *script, const char *hook, const char *lxcpath, |
355 | char **argsin) | |
148e91f5 SH |
356 | { |
357 | int ret, i; | |
358 | char *buffer; | |
359 | size_t size = 0; | |
360 | ||
361 | INFO("Executing script '%s' for container '%s', config section '%s'", | |
362 | script, name, section); | |
363 | ||
364 | for (i=0; argsin && argsin[i]; i++) | |
365 | size += strlen(argsin[i]) + 1; | |
366 | ||
367 | size += strlen(hook) + 1; | |
368 | ||
369 | size += strlen(script); | |
370 | size += strlen(name); | |
371 | size += strlen(section); | |
372 | size += 3; | |
373 | ||
374 | if (size > INT_MAX) | |
375 | return -1; | |
376 | ||
377 | buffer = alloca(size); | |
378 | if (!buffer) { | |
379 | ERROR("failed to allocate memory"); | |
380 | return -1; | |
381 | } | |
382 | ||
383 | ret = snprintf(buffer, size, "%s %s %s %s", script, name, section, hook); | |
384 | if (ret < 0 || ret >= size) { | |
385 | ERROR("Script name too long"); | |
386 | return -1; | |
387 | } | |
388 | ||
389 | for (i=0; argsin && argsin[i]; i++) { | |
390 | int len = size-ret; | |
391 | int rc; | |
392 | rc = snprintf(buffer + ret, len, " %s", argsin[i]); | |
393 | if (rc < 0 || rc >= len) { | |
394 | ERROR("Script args too long"); | |
395 | return -1; | |
396 | } | |
397 | ret += rc; | |
398 | } | |
399 | ||
400 | return run_buffer(buffer); | |
401 | } | |
402 | ||
751d9dcd DL |
403 | static int run_script(const char *name, const char *section, |
404 | const char *script, ...) | |
e3b4c4c4 | 405 | { |
abbfd20b | 406 | int ret; |
91c3830e | 407 | char *buffer, *p; |
abbfd20b DL |
408 | size_t size = 0; |
409 | va_list ap; | |
751d9dcd DL |
410 | |
411 | INFO("Executing script '%s' for container '%s', config section '%s'", | |
412 | script, name, section); | |
e3b4c4c4 | 413 | |
abbfd20b DL |
414 | va_start(ap, script); |
415 | while ((p = va_arg(ap, char *))) | |
95642a10 | 416 | size += strlen(p) + 1; |
abbfd20b DL |
417 | va_end(ap); |
418 | ||
419 | size += strlen(script); | |
420 | size += strlen(name); | |
421 | size += strlen(section); | |
95642a10 | 422 | size += 3; |
abbfd20b | 423 | |
95642a10 MS |
424 | if (size > INT_MAX) |
425 | return -1; | |
426 | ||
427 | buffer = alloca(size); | |
abbfd20b DL |
428 | if (!buffer) { |
429 | ERROR("failed to allocate memory"); | |
751d9dcd DL |
430 | return -1; |
431 | } | |
432 | ||
9ba8130c SH |
433 | ret = snprintf(buffer, size, "%s %s %s", script, name, section); |
434 | if (ret < 0 || ret >= size) { | |
435 | ERROR("Script name too long"); | |
9ba8130c SH |
436 | return -1; |
437 | } | |
751d9dcd | 438 | |
abbfd20b | 439 | va_start(ap, script); |
9ba8130c SH |
440 | while ((p = va_arg(ap, char *))) { |
441 | int len = size-ret; | |
442 | int rc; | |
443 | rc = snprintf(buffer + ret, len, " %s", p); | |
444 | if (rc < 0 || rc >= len) { | |
9ba8130c SH |
445 | ERROR("Script args too long"); |
446 | return -1; | |
447 | } | |
448 | ret += rc; | |
449 | } | |
abbfd20b | 450 | va_end(ap); |
751d9dcd | 451 | |
91c3830e | 452 | return run_buffer(buffer); |
e3b4c4c4 ST |
453 | } |
454 | ||
a6afdde9 | 455 | static int find_fstype_cb(char* buffer, void *data) |
78ae2fcc | 456 | { |
457 | struct cbarg { | |
458 | const char *rootfs; | |
a6afdde9 | 459 | const char *target; |
a17b1e65 | 460 | const char *options; |
78ae2fcc | 461 | } *cbarg = data; |
462 | ||
a17b1e65 SG |
463 | unsigned long mntflags; |
464 | char *mntdata; | |
78ae2fcc | 465 | char *fstype; |
466 | ||
467 | /* we don't try 'nodev' entries */ | |
468 | if (strstr(buffer, "nodev")) | |
469 | return 0; | |
470 | ||
471 | fstype = buffer; | |
b2718c72 | 472 | fstype += lxc_char_left_gc(fstype, strlen(fstype)); |
473 | fstype[lxc_char_right_gc(fstype, strlen(fstype))] = '\0'; | |
78ae2fcc | 474 | |
9827ecdb YK |
475 | /* ignore blank line and comment */ |
476 | if (fstype[0] == '\0' || fstype[0] == '#') | |
477 | return 0; | |
478 | ||
a6afdde9 DL |
479 | DEBUG("trying to mount '%s'->'%s' with fstype '%s'", |
480 | cbarg->rootfs, cbarg->target, fstype); | |
481 | ||
a17b1e65 SG |
482 | if (parse_mntopts(cbarg->options, &mntflags, &mntdata) < 0) { |
483 | free(mntdata); | |
484 | return -1; | |
485 | } | |
486 | ||
487 | if (mount(cbarg->rootfs, cbarg->target, fstype, mntflags, mntdata)) { | |
a6afdde9 | 488 | DEBUG("mount failed with error: %s", strerror(errno)); |
a17b1e65 | 489 | free(mntdata); |
78ae2fcc | 490 | return 0; |
a6afdde9 | 491 | } |
a17b1e65 | 492 | free(mntdata); |
78ae2fcc | 493 | |
a6afdde9 DL |
494 | INFO("mounted '%s' on '%s', with fstype '%s'", |
495 | cbarg->rootfs, cbarg->target, fstype); | |
78ae2fcc | 496 | |
497 | return 1; | |
498 | } | |
499 | ||
a17b1e65 SG |
500 | static int mount_unknown_fs(const char *rootfs, const char *target, |
501 | const char *options) | |
78ae2fcc | 502 | { |
a6afdde9 | 503 | int i; |
78ae2fcc | 504 | |
505 | struct cbarg { | |
506 | const char *rootfs; | |
a6afdde9 | 507 | const char *target; |
a17b1e65 | 508 | const char *options; |
78ae2fcc | 509 | } cbarg = { |
510 | .rootfs = rootfs, | |
a6afdde9 | 511 | .target = target, |
a17b1e65 | 512 | .options = options, |
78ae2fcc | 513 | }; |
514 | ||
a6afdde9 DL |
515 | /* |
516 | * find the filesystem type with brute force: | |
517 | * first we check with /etc/filesystems, in case the modules | |
78ae2fcc | 518 | * are auto-loaded and fall back to the supported kernel fs |
519 | */ | |
520 | char *fsfile[] = { | |
521 | "/etc/filesystems", | |
522 | "/proc/filesystems", | |
523 | }; | |
524 | ||
a6afdde9 DL |
525 | for (i = 0; i < sizeof(fsfile)/sizeof(fsfile[0]); i++) { |
526 | ||
527 | int ret; | |
528 | ||
529 | if (access(fsfile[i], F_OK)) | |
530 | continue; | |
531 | ||
532 | ret = lxc_file_for_each_line(fsfile[i], find_fstype_cb, &cbarg); | |
533 | if (ret < 0) { | |
534 | ERROR("failed to parse '%s'", fsfile[i]); | |
535 | return -1; | |
536 | } | |
537 | ||
538 | if (ret) | |
539 | return 0; | |
78ae2fcc | 540 | } |
541 | ||
a6afdde9 DL |
542 | ERROR("failed to determine fs type for '%s'", rootfs); |
543 | return -1; | |
544 | } | |
545 | ||
a17b1e65 SG |
546 | static int mount_rootfs_dir(const char *rootfs, const char *target, |
547 | const char *options) | |
a6afdde9 | 548 | { |
a17b1e65 SG |
549 | unsigned long mntflags; |
550 | char *mntdata; | |
551 | int ret; | |
552 | ||
553 | if (parse_mntopts(options, &mntflags, &mntdata) < 0) { | |
554 | free(mntdata); | |
555 | return -1; | |
556 | } | |
557 | ||
558 | ret = mount(rootfs, target, "none", MS_BIND | MS_REC | mntflags, mntdata); | |
559 | free(mntdata); | |
560 | ||
561 | return ret; | |
a6afdde9 DL |
562 | } |
563 | ||
564 | static int setup_lodev(const char *rootfs, int fd, struct loop_info64 *loinfo) | |
565 | { | |
566 | int rfd; | |
567 | int ret = -1; | |
568 | ||
569 | rfd = open(rootfs, O_RDWR); | |
570 | if (rfd < 0) { | |
571 | SYSERROR("failed to open '%s'", rootfs); | |
78ae2fcc | 572 | return -1; |
573 | } | |
574 | ||
a6afdde9 | 575 | memset(loinfo, 0, sizeof(*loinfo)); |
78ae2fcc | 576 | |
a6afdde9 | 577 | loinfo->lo_flags = LO_FLAGS_AUTOCLEAR; |
78ae2fcc | 578 | |
a6afdde9 DL |
579 | if (ioctl(fd, LOOP_SET_FD, rfd)) { |
580 | SYSERROR("failed to LOOP_SET_FD"); | |
581 | goto out; | |
78ae2fcc | 582 | } |
583 | ||
a6afdde9 DL |
584 | if (ioctl(fd, LOOP_SET_STATUS64, loinfo)) { |
585 | SYSERROR("failed to LOOP_SET_STATUS64"); | |
78ae2fcc | 586 | goto out; |
587 | } | |
588 | ||
a6afdde9 | 589 | ret = 0; |
78ae2fcc | 590 | out: |
a6afdde9 | 591 | close(rfd); |
78ae2fcc | 592 | |
a6afdde9 | 593 | return ret; |
78ae2fcc | 594 | } |
595 | ||
a17b1e65 SG |
596 | static int mount_rootfs_file(const char *rootfs, const char *target, |
597 | const char *options) | |
78ae2fcc | 598 | { |
a6afdde9 DL |
599 | struct dirent dirent, *direntp; |
600 | struct loop_info64 loinfo; | |
9ba8130c | 601 | int ret = -1, fd = -1, rc; |
a6afdde9 DL |
602 | DIR *dir; |
603 | char path[MAXPATHLEN]; | |
78ae2fcc | 604 | |
a6afdde9 DL |
605 | dir = opendir("/dev"); |
606 | if (!dir) { | |
607 | SYSERROR("failed to open '/dev'"); | |
78ae2fcc | 608 | return -1; |
609 | } | |
610 | ||
a6afdde9 DL |
611 | while (!readdir_r(dir, &dirent, &direntp)) { |
612 | ||
613 | if (!direntp) | |
614 | break; | |
615 | ||
616 | if (!strcmp(direntp->d_name, ".")) | |
617 | continue; | |
618 | ||
619 | if (!strcmp(direntp->d_name, "..")) | |
620 | continue; | |
621 | ||
622 | if (strncmp(direntp->d_name, "loop", 4)) | |
623 | continue; | |
624 | ||
9ba8130c SH |
625 | rc = snprintf(path, MAXPATHLEN, "/dev/%s", direntp->d_name); |
626 | if (rc < 0 || rc >= MAXPATHLEN) | |
627 | continue; | |
628 | ||
a6afdde9 DL |
629 | fd = open(path, O_RDWR); |
630 | if (fd < 0) | |
631 | continue; | |
632 | ||
633 | if (ioctl(fd, LOOP_GET_STATUS64, &loinfo) == 0) { | |
634 | close(fd); | |
635 | continue; | |
636 | } | |
637 | ||
638 | if (errno != ENXIO) { | |
639 | WARN("unexpected error for ioctl on '%s': %m", | |
640 | direntp->d_name); | |
00b6be44 | 641 | close(fd); |
a6afdde9 DL |
642 | continue; |
643 | } | |
644 | ||
645 | DEBUG("found '%s' free lodev", path); | |
646 | ||
647 | ret = setup_lodev(rootfs, fd, &loinfo); | |
648 | if (!ret) | |
a17b1e65 | 649 | ret = mount_unknown_fs(path, target, options); |
a6afdde9 DL |
650 | close(fd); |
651 | ||
652 | break; | |
653 | } | |
654 | ||
655 | if (closedir(dir)) | |
656 | WARN("failed to close directory"); | |
657 | ||
658 | return ret; | |
78ae2fcc | 659 | } |
660 | ||
a17b1e65 SG |
661 | static int mount_rootfs_block(const char *rootfs, const char *target, |
662 | const char *options) | |
a6afdde9 | 663 | { |
a17b1e65 | 664 | return mount_unknown_fs(rootfs, target, options); |
a6afdde9 DL |
665 | } |
666 | ||
0c547523 SH |
667 | /* |
668 | * pin_rootfs | |
b7ed4bf0 CS |
669 | * if rootfs is a directory, then open ${rootfs}/lxc.hold for writing for |
670 | * the duration of the container run, to prevent the container from marking | |
671 | * the underlying fs readonly on shutdown. unlink the file immediately so | |
672 | * no name pollution is happens | |
0c547523 SH |
673 | * return -1 on error. |
674 | * return -2 if nothing needed to be pinned. | |
675 | * return an open fd (>=0) if we pinned it. | |
676 | */ | |
677 | int pin_rootfs(const char *rootfs) | |
678 | { | |
679 | char absrootfs[MAXPATHLEN]; | |
680 | char absrootfspin[MAXPATHLEN]; | |
681 | struct stat s; | |
682 | int ret, fd; | |
683 | ||
e99ee0de | 684 | if (rootfs == NULL || strlen(rootfs) == 0) |
0d03360a | 685 | return -2; |
e99ee0de | 686 | |
00ec333b | 687 | if (!realpath(rootfs, absrootfs)) |
9be53773 | 688 | return -2; |
0c547523 | 689 | |
00ec333b | 690 | if (access(absrootfs, F_OK)) |
0c547523 | 691 | return -1; |
0c547523 | 692 | |
00ec333b | 693 | if (stat(absrootfs, &s)) |
0c547523 | 694 | return -1; |
0c547523 | 695 | |
72f919c4 | 696 | if (!S_ISDIR(s.st_mode)) |
0c547523 SH |
697 | return -2; |
698 | ||
b7ed4bf0 | 699 | ret = snprintf(absrootfspin, MAXPATHLEN, "%s/lxc.hold", absrootfs); |
00ec333b | 700 | if (ret >= MAXPATHLEN) |
0c547523 | 701 | return -1; |
0c547523 SH |
702 | |
703 | fd = open(absrootfspin, O_CREAT | O_RDWR, S_IWUSR|S_IRUSR); | |
b7ed4bf0 CS |
704 | if (fd < 0) |
705 | return fd; | |
706 | (void)unlink(absrootfspin); | |
0c547523 SH |
707 | return fd; |
708 | } | |
709 | ||
e2a7e8dc SH |
710 | /* |
711 | * If we are asking to remount something, make sure that any | |
712 | * NOEXEC etc are honored. | |
713 | */ | |
714 | static unsigned long add_required_remount_flags(const char *s, const char *d, | |
715 | unsigned long flags) | |
716 | { | |
614305f3 | 717 | #ifdef HAVE_STATVFS |
e2a7e8dc SH |
718 | struct statvfs sb; |
719 | unsigned long required_flags = 0; | |
720 | ||
721 | if (!(flags & MS_REMOUNT)) | |
722 | return flags; | |
723 | ||
724 | if (!s) | |
725 | s = d; | |
726 | ||
727 | if (!s) | |
728 | return flags; | |
729 | if (statvfs(s, &sb) < 0) | |
730 | return flags; | |
731 | ||
732 | if (sb.f_flag & MS_NOSUID) | |
733 | required_flags |= MS_NOSUID; | |
734 | if (sb.f_flag & MS_NODEV) | |
735 | required_flags |= MS_NODEV; | |
736 | if (sb.f_flag & MS_RDONLY) | |
737 | required_flags |= MS_RDONLY; | |
738 | if (sb.f_flag & MS_NOEXEC) | |
739 | required_flags |= MS_NOEXEC; | |
740 | ||
741 | return flags | required_flags; | |
614305f3 SH |
742 | #else |
743 | return flags; | |
744 | #endif | |
e2a7e8dc SH |
745 | } |
746 | ||
4fb3cba5 | 747 | static int lxc_mount_auto_mounts(struct lxc_conf *conf, int flags, struct lxc_handler *handler) |
368bbc02 | 748 | { |
368bbc02 | 749 | int r; |
b06b8511 CS |
750 | size_t i; |
751 | static struct { | |
752 | int match_mask; | |
753 | int match_flag; | |
754 | const char *source; | |
755 | const char *destination; | |
756 | const char *fstype; | |
757 | unsigned long flags; | |
758 | const char *options; | |
759 | } default_mounts[] = { | |
760 | /* Read-only bind-mounting... In older kernels, doing that required | |
761 | * to do one MS_BIND mount and then MS_REMOUNT|MS_RDONLY the same | |
762 | * one. According to mount(2) manpage, MS_BIND honors MS_RDONLY from | |
763 | * kernel 2.6.26 onwards. However, this apparently does not work on | |
764 | * kernel 3.8. Unfortunately, on that very same kernel, doing the | |
765 | * same trick as above doesn't seem to work either, there one needs | |
766 | * to ALSO specify MS_BIND for the remount, otherwise the entire | |
767 | * fs is remounted read-only or the mount fails because it's busy... | |
768 | * MS_REMOUNT|MS_BIND|MS_RDONLY seems to work for kernels as low as | |
769 | * 2.6.32... | |
368bbc02 | 770 | */ |
f24a52d5 | 771 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, |
592fd47a SH |
772 | /* proc/tty is used as a temporary placeholder for proc/sys/net which we'll move back in a few steps */ |
773 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys/net", "%r/proc/tty", NULL, MS_BIND, NULL }, | |
f24a52d5 SG |
774 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys", "%r/proc/sys", NULL, MS_BIND, NULL }, |
775 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
592fd47a | 776 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/tty", "%r/proc/sys/net", NULL, MS_MOVE, NULL }, |
f24a52d5 SG |
777 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sysrq-trigger", "%r/proc/sysrq-trigger", NULL, MS_BIND, NULL }, |
778 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sysrq-trigger", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
779 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_RW, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
780 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RW, "sysfs", "%r/sys", "sysfs", 0, NULL }, | |
781 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RO, "sysfs", "%r/sys", "sysfs", MS_RDONLY, NULL }, | |
782 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys", "sysfs", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
783 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "%r/sys", "%r/sys", NULL, MS_BIND, NULL }, | |
784 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, NULL, "%r/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
785 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys/devices/virtual/net", "sysfs", 0, NULL }, | |
786 | { 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 }, | |
787 | { 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 }, | |
788 | { 0, 0, NULL, NULL, NULL, 0, NULL } | |
b06b8511 | 789 | }; |
368bbc02 | 790 | |
b06b8511 CS |
791 | for (i = 0; default_mounts[i].match_mask; i++) { |
792 | if ((flags & default_mounts[i].match_mask) == default_mounts[i].match_flag) { | |
793 | char *source = NULL; | |
794 | char *destination = NULL; | |
795 | int saved_errno; | |
e2a7e8dc | 796 | unsigned long mflags; |
b06b8511 CS |
797 | |
798 | if (default_mounts[i].source) { | |
799 | /* will act like strdup if %r is not present */ | |
8ede5f4c | 800 | source = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].source); |
b06b8511 CS |
801 | if (!source) { |
802 | SYSERROR("memory allocation error"); | |
803 | return -1; | |
804 | } | |
805 | } | |
806 | if (default_mounts[i].destination) { | |
807 | /* will act like strdup if %r is not present */ | |
8ede5f4c | 808 | destination = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].destination); |
b06b8511 CS |
809 | if (!destination) { |
810 | saved_errno = errno; | |
811 | SYSERROR("memory allocation error"); | |
812 | free(source); | |
813 | errno = saved_errno; | |
814 | return -1; | |
815 | } | |
816 | } | |
e2a7e8dc SH |
817 | mflags = add_required_remount_flags(source, destination, |
818 | default_mounts[i].flags); | |
592fd47a | 819 | r = safe_mount(source, destination, default_mounts[i].fstype, mflags, default_mounts[i].options, conf->rootfs.path ? conf->rootfs.mount : NULL); |
b06b8511 | 820 | saved_errno = errno; |
b88ff9a0 SG |
821 | if (r < 0 && errno == ENOENT) { |
822 | INFO("Mount source or target for %s on %s doesn't exist. Skipping.", source, destination); | |
823 | r = 0; | |
824 | } | |
825 | else if (r < 0) | |
e2a7e8dc | 826 | SYSERROR("error mounting %s on %s flags %lu", source, destination, mflags); |
f24a52d5 | 827 | |
b06b8511 CS |
828 | free(source); |
829 | free(destination); | |
830 | if (r < 0) { | |
b06b8511 CS |
831 | errno = saved_errno; |
832 | return -1; | |
833 | } | |
368bbc02 | 834 | } |
368bbc02 CS |
835 | } |
836 | ||
b06b8511 | 837 | if (flags & LXC_AUTO_CGROUP_MASK) { |
0769b82a CS |
838 | int cg_flags; |
839 | ||
840 | cg_flags = flags & LXC_AUTO_CGROUP_MASK; | |
841 | /* If the type of cgroup mount was not specified, it depends on the | |
842 | * container's capabilities as to what makes sense: if we have | |
843 | * CAP_SYS_ADMIN, the read-only part can be remounted read-write | |
844 | * anyway, so we may as well default to read-write; then the admin | |
845 | * will not be given a false sense of security. (And if they really | |
846 | * want mixed r/o r/w, then they can explicitly specify :mixed.) | |
847 | * OTOH, if the container lacks CAP_SYS_ADMIN, do only default to | |
848 | * :mixed, because then the container can't remount it read-write. */ | |
849 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC || cg_flags == LXC_AUTO_CGROUP_FULL_NOSPEC) { | |
850 | int has_sys_admin = 0; | |
851 | if (!lxc_list_empty(&conf->keepcaps)) { | |
852 | has_sys_admin = in_caplist(CAP_SYS_ADMIN, &conf->keepcaps); | |
853 | } else { | |
854 | has_sys_admin = !in_caplist(CAP_SYS_ADMIN, &conf->caps); | |
855 | } | |
856 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC) { | |
857 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_RW : LXC_AUTO_CGROUP_MIXED; | |
858 | } else { | |
859 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_FULL_RW : LXC_AUTO_CGROUP_FULL_MIXED; | |
860 | } | |
861 | } | |
862 | ||
8ede5f4c | 863 | if (!cgroup_mount(conf->rootfs.path ? conf->rootfs.mount : "", handler, cg_flags)) { |
368bbc02 | 864 | SYSERROR("error mounting /sys/fs/cgroup"); |
b06b8511 | 865 | return -1; |
368bbc02 CS |
866 | } |
867 | } | |
868 | ||
368bbc02 | 869 | return 0; |
368bbc02 CS |
870 | } |
871 | ||
a17b1e65 | 872 | static int mount_rootfs(const char *rootfs, const char *target, const char *options) |
0ad19a3f | 873 | { |
b09ef133 | 874 | char absrootfs[MAXPATHLEN]; |
78ae2fcc | 875 | struct stat s; |
a6afdde9 | 876 | int i; |
78ae2fcc | 877 | |
a17b1e65 | 878 | typedef int (*rootfs_cb)(const char *, const char *, const char *); |
78ae2fcc | 879 | |
880 | struct rootfs_type { | |
881 | int type; | |
882 | rootfs_cb cb; | |
883 | } rtfs_type[] = { | |
2656d231 DL |
884 | { S_IFDIR, mount_rootfs_dir }, |
885 | { S_IFBLK, mount_rootfs_block }, | |
886 | { S_IFREG, mount_rootfs_file }, | |
78ae2fcc | 887 | }; |
0ad19a3f | 888 | |
4c8ab83b | 889 | if (!realpath(rootfs, absrootfs)) { |
36eb9bde | 890 | SYSERROR("failed to get real path for '%s'", rootfs); |
4c8ab83b | 891 | return -1; |
892 | } | |
b09ef133 | 893 | |
b09ef133 | 894 | if (access(absrootfs, F_OK)) { |
36eb9bde | 895 | SYSERROR("'%s' is not accessible", absrootfs); |
b09ef133 | 896 | return -1; |
897 | } | |
898 | ||
78ae2fcc | 899 | if (stat(absrootfs, &s)) { |
36eb9bde | 900 | SYSERROR("failed to stat '%s'", absrootfs); |
9b0f0477 | 901 | return -1; |
902 | } | |
903 | ||
78ae2fcc | 904 | for (i = 0; i < sizeof(rtfs_type)/sizeof(rtfs_type[0]); i++) { |
9b0f0477 | 905 | |
78ae2fcc | 906 | if (!__S_ISTYPE(s.st_mode, rtfs_type[i].type)) |
907 | continue; | |
9b0f0477 | 908 | |
a17b1e65 | 909 | return rtfs_type[i].cb(absrootfs, target, options); |
78ae2fcc | 910 | } |
9b0f0477 | 911 | |
36eb9bde | 912 | ERROR("unsupported rootfs type for '%s'", absrootfs); |
78ae2fcc | 913 | return -1; |
0ad19a3f | 914 | } |
915 | ||
4e5440c6 | 916 | static int setup_utsname(struct utsname *utsname) |
0ad19a3f | 917 | { |
4e5440c6 DL |
918 | if (!utsname) |
919 | return 0; | |
0ad19a3f | 920 | |
4e5440c6 DL |
921 | if (sethostname(utsname->nodename, strlen(utsname->nodename))) { |
922 | SYSERROR("failed to set the hostname to '%s'", utsname->nodename); | |
0ad19a3f | 923 | return -1; |
924 | } | |
925 | ||
4e5440c6 | 926 | INFO("'%s' hostname has been setup", utsname->nodename); |
cd54d859 | 927 | |
0ad19a3f | 928 | return 0; |
929 | } | |
930 | ||
69aa6655 DE |
931 | struct dev_symlinks { |
932 | const char *oldpath; | |
933 | const char *name; | |
934 | }; | |
935 | ||
936 | static const struct dev_symlinks dev_symlinks[] = { | |
937 | {"/proc/self/fd", "fd"}, | |
938 | {"/proc/self/fd/0", "stdin"}, | |
939 | {"/proc/self/fd/1", "stdout"}, | |
940 | {"/proc/self/fd/2", "stderr"}, | |
941 | }; | |
942 | ||
943 | static int setup_dev_symlinks(const struct lxc_rootfs *rootfs) | |
944 | { | |
945 | char path[MAXPATHLEN]; | |
946 | int ret,i; | |
09227be2 | 947 | struct stat s; |
69aa6655 DE |
948 | |
949 | ||
950 | for (i = 0; i < sizeof(dev_symlinks) / sizeof(dev_symlinks[0]); i++) { | |
951 | const struct dev_symlinks *d = &dev_symlinks[i]; | |
cd2b3cfe | 952 | ret = snprintf(path, sizeof(path), "%s/dev/%s", rootfs->path ? rootfs->mount : "", d->name); |
69aa6655 DE |
953 | if (ret < 0 || ret >= MAXPATHLEN) |
954 | return -1; | |
09227be2 MW |
955 | |
956 | /* | |
957 | * Stat the path first. If we don't get an error | |
958 | * accept it as is and don't try to create it | |
959 | */ | |
960 | if (!stat(path, &s)) { | |
961 | continue; | |
962 | } | |
963 | ||
69aa6655 | 964 | ret = symlink(d->oldpath, path); |
09227be2 | 965 | |
69aa6655 | 966 | if (ret && errno != EEXIST) { |
09227be2 MW |
967 | if ( errno == EROFS ) { |
968 | WARN("Warning: Read Only file system while creating %s", path); | |
969 | } else { | |
970 | SYSERROR("Error creating %s", path); | |
971 | return -1; | |
972 | } | |
69aa6655 DE |
973 | } |
974 | } | |
975 | return 0; | |
976 | } | |
977 | ||
393903d1 SH |
978 | /* |
979 | * Build a space-separate list of ptys to pass to systemd. | |
980 | */ | |
981 | static bool append_ptyname(char **pp, char *name) | |
b0a33c1e | 982 | { |
393903d1 SH |
983 | char *p; |
984 | ||
985 | if (!*pp) { | |
986 | *pp = malloc(strlen(name) + strlen("container_ttys=") + 1); | |
987 | if (!*pp) | |
988 | return false; | |
989 | sprintf(*pp, "container_ttys=%s", name); | |
990 | return true; | |
991 | } | |
992 | p = realloc(*pp, strlen(*pp) + strlen(name) + 2); | |
993 | if (!p) | |
994 | return false; | |
995 | *pp = p; | |
996 | strcat(p, " "); | |
997 | strcat(p, name); | |
998 | return true; | |
999 | } | |
1000 | ||
1001 | static int setup_tty(struct lxc_conf *conf) | |
1002 | { | |
393903d1 SH |
1003 | const struct lxc_tty_info *tty_info = &conf->tty_info; |
1004 | char *ttydir = conf->ttydir; | |
7c6ef2a2 SH |
1005 | char path[MAXPATHLEN], lxcpath[MAXPATHLEN]; |
1006 | int i, ret; | |
b0a33c1e | 1007 | |
e8bd4e43 | 1008 | if (!conf->rootfs.path) |
bc9bd0e3 DL |
1009 | return 0; |
1010 | ||
b0a33c1e | 1011 | for (i = 0; i < tty_info->nbtty; i++) { |
1012 | ||
1013 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; | |
1014 | ||
e8bd4e43 | 1015 | ret = snprintf(path, sizeof(path), "/dev/tty%d", i + 1); |
7c6ef2a2 SH |
1016 | if (ret >= sizeof(path)) { |
1017 | ERROR("pathname too long for ttys"); | |
1018 | return -1; | |
1019 | } | |
1020 | if (ttydir) { | |
1021 | /* create dev/lxc/tty%d" */ | |
e8bd4e43 | 1022 | ret = snprintf(lxcpath, sizeof(lxcpath), "/dev/%s/tty%d", ttydir, i + 1); |
7c6ef2a2 SH |
1023 | if (ret >= sizeof(lxcpath)) { |
1024 | ERROR("pathname too long for ttys"); | |
1025 | return -1; | |
1026 | } | |
1027 | ret = creat(lxcpath, 0660); | |
1028 | if (ret==-1 && errno != EEXIST) { | |
959aee9c | 1029 | SYSERROR("error creating %s", lxcpath); |
7c6ef2a2 SH |
1030 | return -1; |
1031 | } | |
4d44e274 SH |
1032 | if (ret >= 0) |
1033 | close(ret); | |
7c6ef2a2 SH |
1034 | ret = unlink(path); |
1035 | if (ret && errno != ENOENT) { | |
959aee9c | 1036 | SYSERROR("error unlinking %s", path); |
7c6ef2a2 SH |
1037 | return -1; |
1038 | } | |
b0a33c1e | 1039 | |
7c6ef2a2 SH |
1040 | if (mount(pty_info->name, lxcpath, "none", MS_BIND, 0)) { |
1041 | WARN("failed to mount '%s'->'%s'", | |
1042 | pty_info->name, path); | |
1043 | continue; | |
1044 | } | |
13954cce | 1045 | |
9ba8130c SH |
1046 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/tty%d", ttydir, i+1); |
1047 | if (ret >= sizeof(lxcpath)) { | |
1048 | ERROR("tty pathname too long"); | |
1049 | return -1; | |
1050 | } | |
7c6ef2a2 SH |
1051 | ret = symlink(lxcpath, path); |
1052 | if (ret) { | |
959aee9c | 1053 | SYSERROR("failed to create symlink for tty %d", i+1); |
7c6ef2a2 SH |
1054 | return -1; |
1055 | } | |
1056 | } else { | |
c6883f38 SH |
1057 | /* If we populated /dev, then we need to create /dev/ttyN */ |
1058 | if (access(path, F_OK)) { | |
1059 | ret = creat(path, 0660); | |
1060 | if (ret==-1) { | |
959aee9c | 1061 | SYSERROR("error creating %s", path); |
c6883f38 | 1062 | /* this isn't fatal, continue */ |
025ed0f3 | 1063 | } else { |
c6883f38 | 1064 | close(ret); |
025ed0f3 | 1065 | } |
c6883f38 | 1066 | } |
7c6ef2a2 | 1067 | if (mount(pty_info->name, path, "none", MS_BIND, 0)) { |
e8bd4e43 | 1068 | SYSERROR("failed to mount '%s'->'%s'", pty_info->name, path); |
7c6ef2a2 SH |
1069 | continue; |
1070 | } | |
393903d1 | 1071 | } |
e8bd4e43 | 1072 | if (!append_ptyname(&conf->pty_names, pty_info->name)) { |
393903d1 SH |
1073 | ERROR("Error setting up container_ttys string"); |
1074 | return -1; | |
b0a33c1e | 1075 | } |
1076 | } | |
1077 | ||
cd54d859 DL |
1078 | INFO("%d tty(s) has been setup", tty_info->nbtty); |
1079 | ||
b0a33c1e | 1080 | return 0; |
1081 | } | |
1082 | ||
bf601689 | 1083 | |
2d489f9e | 1084 | static int setup_rootfs_pivot_root(const char *rootfs, const char *pivotdir) |
bf601689 | 1085 | { |
2d489f9e | 1086 | int oldroot = -1, newroot = -1; |
bf601689 | 1087 | |
2d489f9e SH |
1088 | oldroot = open("/", O_DIRECTORY | O_RDONLY); |
1089 | if (oldroot < 0) { | |
1090 | SYSERROR("Error opening old-/ for fchdir"); | |
9ba8130c SH |
1091 | return -1; |
1092 | } | |
2d489f9e SH |
1093 | newroot = open(rootfs, O_DIRECTORY | O_RDONLY); |
1094 | if (newroot < 0) { | |
1095 | SYSERROR("Error opening new-/ for fchdir"); | |
1096 | goto fail; | |
c08556c6 | 1097 | } |
bf601689 | 1098 | |
cc6f6dd7 | 1099 | /* change into new root fs */ |
2d489f9e | 1100 | if (fchdir(newroot)) { |
cc6f6dd7 | 1101 | SYSERROR("can't chdir to new rootfs '%s'", rootfs); |
2d489f9e | 1102 | goto fail; |
cc6f6dd7 DL |
1103 | } |
1104 | ||
cc6f6dd7 | 1105 | /* pivot_root into our new root fs */ |
2d489f9e | 1106 | if (pivot_root(".", ".")) { |
cc6f6dd7 | 1107 | SYSERROR("pivot_root syscall failed"); |
2d489f9e | 1108 | goto fail; |
bf601689 | 1109 | } |
cc6f6dd7 | 1110 | |
2d489f9e SH |
1111 | /* |
1112 | * at this point the old-root is mounted on top of our new-root | |
1113 | * To unmounted it we must not be chdir'd into it, so escape back | |
1114 | * to old-root | |
1115 | */ | |
1116 | if (fchdir(oldroot) < 0) { | |
1117 | SYSERROR("Error entering oldroot"); | |
1118 | goto fail; | |
1119 | } | |
7981ea46 | 1120 | if (umount2(".", MNT_DETACH) < 0) { |
2d489f9e SH |
1121 | SYSERROR("Error detaching old root"); |
1122 | goto fail; | |
cc6f6dd7 DL |
1123 | } |
1124 | ||
2d489f9e SH |
1125 | if (fchdir(newroot) < 0) { |
1126 | SYSERROR("Error re-entering newroot"); | |
1127 | goto fail; | |
1128 | } | |
cc6f6dd7 | 1129 | |
2d489f9e SH |
1130 | close(oldroot); |
1131 | close(newroot); | |
bf601689 | 1132 | |
2d489f9e | 1133 | DEBUG("pivot_root syscall to '%s' successful", rootfs); |
bf601689 | 1134 | |
bf601689 | 1135 | return 0; |
2d489f9e SH |
1136 | |
1137 | fail: | |
1138 | if (oldroot != -1) | |
1139 | close(oldroot); | |
1140 | if (newroot != -1) | |
1141 | close(newroot); | |
1142 | return -1; | |
bf601689 MH |
1143 | } |
1144 | ||
bc6928ff | 1145 | /* |
87da4ec3 SH |
1146 | * Just create a path for /dev under $lxcpath/$name and in rootfs |
1147 | * If we hit an error, log it but don't fail yet. | |
91c3830e | 1148 | */ |
14221cbb | 1149 | static int mount_autodev(const char *name, const struct lxc_rootfs *rootfs, const char *lxcpath) |
91c3830e SH |
1150 | { |
1151 | int ret; | |
87da4ec3 SH |
1152 | size_t clen; |
1153 | char *path; | |
91c3830e | 1154 | |
14221cbb | 1155 | INFO("Mounting container /dev"); |
bc6928ff | 1156 | |
14221cbb DW |
1157 | /* $(rootfs->mount) + "/dev/pts" + '\0' */ |
1158 | clen = (rootfs->path ? strlen(rootfs->mount) : 0) + 9; | |
87da4ec3 | 1159 | path = alloca(clen); |
bc6928ff | 1160 | |
14221cbb | 1161 | ret = snprintf(path, clen, "%s/dev", rootfs->path ? rootfs->mount : ""); |
87da4ec3 | 1162 | if (ret < 0 || ret >= clen) |
91c3830e | 1163 | return -1; |
bc6928ff | 1164 | |
87da4ec3 | 1165 | if (!dir_exists(path)) { |
14221cbb | 1166 | WARN("No /dev in container."); |
87da4ec3 SH |
1167 | WARN("Proceeding without autodev setup"); |
1168 | return 0; | |
bc6928ff | 1169 | } |
87da4ec3 | 1170 | |
592fd47a SH |
1171 | if (safe_mount("none", path, "tmpfs", 0, "size=100000,mode=755", |
1172 | rootfs->path ? rootfs->mount : NULL)) { | |
87da4ec3 SH |
1173 | SYSERROR("Failed mounting tmpfs onto %s\n", path); |
1174 | return false; | |
91c3830e | 1175 | } |
87da4ec3 SH |
1176 | |
1177 | INFO("Mounted tmpfs onto %s", path); | |
1178 | ||
14221cbb | 1179 | ret = snprintf(path, clen, "%s/dev/pts", rootfs->path ? rootfs->mount : ""); |
87da4ec3 | 1180 | if (ret < 0 || ret >= clen) |
91c3830e | 1181 | return -1; |
87da4ec3 | 1182 | |
bc6928ff MW |
1183 | /* |
1184 | * If we are running on a devtmpfs mapping, dev/pts may already exist. | |
1185 | * If not, then create it and exit if that fails... | |
1186 | */ | |
87da4ec3 | 1187 | if (!dir_exists(path)) { |
bc6928ff MW |
1188 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
1189 | if (ret) { | |
1190 | SYSERROR("Failed to create /dev/pts in container"); | |
1191 | return -1; | |
1192 | } | |
91c3830e SH |
1193 | } |
1194 | ||
14221cbb | 1195 | INFO("Mounted container /dev"); |
91c3830e SH |
1196 | return 0; |
1197 | } | |
1198 | ||
c6883f38 | 1199 | struct lxc_devs { |
74a3920a | 1200 | const char *name; |
c6883f38 SH |
1201 | mode_t mode; |
1202 | int maj; | |
1203 | int min; | |
1204 | }; | |
1205 | ||
74a3920a | 1206 | static const struct lxc_devs lxc_devs[] = { |
c6883f38 SH |
1207 | { "null", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 3 }, |
1208 | { "zero", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 5 }, | |
1209 | { "full", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 7 }, | |
1210 | { "urandom", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 9 }, | |
1211 | { "random", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 8 }, | |
1212 | { "tty", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 5, 0 }, | |
1213 | { "console", S_IFCHR | S_IRUSR | S_IWUSR, 5, 1 }, | |
1214 | }; | |
1215 | ||
14221cbb | 1216 | static int fill_autodev(const struct lxc_rootfs *rootfs) |
c6883f38 SH |
1217 | { |
1218 | int ret; | |
c6883f38 SH |
1219 | char path[MAXPATHLEN]; |
1220 | int i; | |
3a32201c | 1221 | mode_t cmask; |
c6883f38 | 1222 | |
14221cbb | 1223 | INFO("Creating initial consoles under container /dev"); |
91c3830e | 1224 | |
14221cbb | 1225 | ret = snprintf(path, MAXPATHLEN, "%s/dev", rootfs->path ? rootfs->mount : ""); |
91c3830e SH |
1226 | if (ret < 0 || ret >= MAXPATHLEN) { |
1227 | ERROR("Error calculating container /dev location"); | |
c6883f38 | 1228 | return -1; |
f7bee6c6 | 1229 | } |
91c3830e | 1230 | |
9cb4d183 SH |
1231 | if (!dir_exists(path)) // ignore, just don't try to fill in |
1232 | return 0; | |
1233 | ||
14221cbb | 1234 | INFO("Populating container /dev"); |
3a32201c | 1235 | cmask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
c6883f38 | 1236 | for (i = 0; i < sizeof(lxc_devs) / sizeof(lxc_devs[0]); i++) { |
74a3920a | 1237 | const struct lxc_devs *d = &lxc_devs[i]; |
14221cbb | 1238 | ret = snprintf(path, MAXPATHLEN, "%s/dev/%s", rootfs->path ? rootfs->mount : "", d->name); |
c6883f38 SH |
1239 | if (ret < 0 || ret >= MAXPATHLEN) |
1240 | return -1; | |
1241 | ret = mknod(path, d->mode, makedev(d->maj, d->min)); | |
91c3830e | 1242 | if (ret && errno != EEXIST) { |
9cb4d183 SH |
1243 | char hostpath[MAXPATHLEN]; |
1244 | FILE *pathfile; | |
1245 | ||
1246 | // Unprivileged containers cannot create devices, so | |
1247 | // bind mount the device from the host | |
1248 | ret = snprintf(hostpath, MAXPATHLEN, "/dev/%s", d->name); | |
1249 | if (ret < 0 || ret >= MAXPATHLEN) | |
1250 | return -1; | |
1251 | pathfile = fopen(path, "wb"); | |
1252 | if (!pathfile) { | |
1253 | SYSERROR("Failed to create device mount target '%s'", path); | |
1254 | return -1; | |
1255 | } | |
1256 | fclose(pathfile); | |
592fd47a SH |
1257 | if (safe_mount(hostpath, path, 0, MS_BIND, NULL, |
1258 | rootfs->path ? rootfs->mount : NULL) != 0) { | |
9cb4d183 SH |
1259 | SYSERROR("Failed bind mounting device %s from host into container", |
1260 | d->name); | |
1261 | return -1; | |
1262 | } | |
c6883f38 SH |
1263 | } |
1264 | } | |
3a32201c | 1265 | umask(cmask); |
c6883f38 | 1266 | |
14221cbb | 1267 | INFO("Populated container /dev"); |
c6883f38 SH |
1268 | return 0; |
1269 | } | |
1270 | ||
cc28d0b0 | 1271 | static int setup_rootfs(struct lxc_conf *conf) |
0ad19a3f | 1272 | { |
cc28d0b0 SH |
1273 | const struct lxc_rootfs *rootfs = &conf->rootfs; |
1274 | ||
a0f379bf DW |
1275 | if (!rootfs->path) { |
1276 | if (mount("", "/", NULL, MS_SLAVE|MS_REC, 0)) { | |
1277 | SYSERROR("Failed to make / rslave"); | |
1278 | return -1; | |
1279 | } | |
c69bd12f | 1280 | return 0; |
a0f379bf | 1281 | } |
0ad19a3f | 1282 | |
12297168 | 1283 | if (access(rootfs->mount, F_OK)) { |
b1789442 | 1284 | SYSERROR("failed to access to '%s', check it is present", |
12297168 | 1285 | rootfs->mount); |
b1789442 DL |
1286 | return -1; |
1287 | } | |
1288 | ||
9be53773 | 1289 | // First try mounting rootfs using a bdev |
76a26f55 | 1290 | struct bdev *bdev = bdev_init(conf, rootfs->path, rootfs->mount, rootfs->options); |
9be53773 | 1291 | if (bdev && bdev->ops->mount(bdev) == 0) { |
59d66af2 | 1292 | bdev_put(bdev); |
9be53773 SH |
1293 | DEBUG("mounted '%s' on '%s'", rootfs->path, rootfs->mount); |
1294 | return 0; | |
1295 | } | |
59d66af2 SH |
1296 | if (bdev) |
1297 | bdev_put(bdev); | |
a17b1e65 | 1298 | if (mount_rootfs(rootfs->path, rootfs->mount, rootfs->options)) { |
a6afdde9 | 1299 | ERROR("failed to mount rootfs"); |
c3f0a28c | 1300 | return -1; |
1301 | } | |
0ad19a3f | 1302 | |
12297168 | 1303 | DEBUG("mounted '%s' on '%s'", rootfs->path, rootfs->mount); |
c69bd12f | 1304 | |
ac778708 DL |
1305 | return 0; |
1306 | } | |
1307 | ||
91e93c71 AV |
1308 | int prepare_ramfs_root(char *root) |
1309 | { | |
1310 | char buf[LINELEN], *p; | |
1311 | char nroot[PATH_MAX]; | |
1312 | FILE *f; | |
1313 | int i; | |
1314 | char *p2; | |
1315 | ||
1316 | if (realpath(root, nroot) == NULL) | |
1317 | return -1; | |
1318 | ||
1319 | if (chdir("/") == -1) | |
1320 | return -1; | |
1321 | ||
1322 | /* | |
1323 | * We could use here MS_MOVE, but in userns this mount is | |
1324 | * locked and can't be moved. | |
1325 | */ | |
1326 | if (mount(root, "/", NULL, MS_REC | MS_BIND, NULL)) { | |
1327 | SYSERROR("Failed to move %s into /", root); | |
1328 | return -1; | |
1329 | } | |
1330 | ||
88322f77 | 1331 | if (mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL)) { |
91e93c71 AV |
1332 | SYSERROR("Failed to make . rprivate"); |
1333 | return -1; | |
1334 | } | |
1335 | ||
1336 | /* | |
1337 | * The following code cleans up inhereted mounts which are not | |
1338 | * required for CT. | |
1339 | * | |
1340 | * The mountinfo file shows not all mounts, if a few points have been | |
1341 | * unmounted between read operations from the mountinfo. So we need to | |
1342 | * read mountinfo a few times. | |
1343 | * | |
1344 | * This loop can be skipped if a container uses unserns, because all | |
1345 | * inherited mounts are locked and we should live with all this trash. | |
1346 | */ | |
1347 | while (1) { | |
1348 | int progress = 0; | |
1349 | ||
1350 | f = fopen("./proc/self/mountinfo", "r"); | |
1351 | if (!f) { | |
1352 | SYSERROR("Unable to open /proc/self/mountinfo"); | |
1353 | return -1; | |
1354 | } | |
1355 | while (fgets(buf, LINELEN, f)) { | |
1356 | for (p = buf, i=0; p && i < 4; i++) | |
1357 | p = strchr(p+1, ' '); | |
1358 | if (!p) | |
1359 | continue; | |
1360 | p2 = strchr(p+1, ' '); | |
1361 | if (!p2) | |
1362 | continue; | |
1363 | ||
1364 | *p2 = '\0'; | |
1365 | *p = '.'; | |
1366 | ||
1367 | if (strcmp(p + 1, "/") == 0) | |
1368 | continue; | |
1369 | if (strcmp(p + 1, "/proc") == 0) | |
1370 | continue; | |
1371 | ||
1372 | if (umount2(p, MNT_DETACH) == 0) | |
1373 | progress++; | |
1374 | } | |
1375 | fclose(f); | |
1376 | if (!progress) | |
1377 | break; | |
1378 | } | |
1379 | ||
8bea9fae PR |
1380 | /* This also can be skipped if a container uses unserns */ |
1381 | umount2("./proc", MNT_DETACH); | |
91e93c71 AV |
1382 | |
1383 | /* It is weird, but chdir("..") moves us in a new root */ | |
1384 | if (chdir("..") == -1) { | |
1385 | SYSERROR("Unable to change working directory"); | |
1386 | return -1; | |
1387 | } | |
1388 | ||
1389 | if (chroot(".") == -1) { | |
1390 | SYSERROR("Unable to chroot"); | |
1391 | return -1; | |
1392 | } | |
1393 | ||
1394 | return 0; | |
1395 | } | |
1396 | ||
74a3920a | 1397 | static int setup_pivot_root(const struct lxc_rootfs *rootfs) |
ac778708 | 1398 | { |
ac778708 DL |
1399 | if (!rootfs->path) |
1400 | return 0; | |
1401 | ||
91e93c71 AV |
1402 | if (detect_ramfs_rootfs()) { |
1403 | if (prepare_ramfs_root(rootfs->mount)) | |
1404 | return -1; | |
1405 | } else if (setup_rootfs_pivot_root(rootfs->mount, rootfs->pivot)) { | |
cc6f6dd7 | 1406 | ERROR("failed to setup pivot root"); |
25368b52 | 1407 | return -1; |
c69bd12f DL |
1408 | } |
1409 | ||
25368b52 | 1410 | return 0; |
0ad19a3f | 1411 | } |
1412 | ||
d852c78c | 1413 | static int setup_pts(int pts) |
3c26f34e | 1414 | { |
77890c6d SW |
1415 | char target[PATH_MAX]; |
1416 | ||
d852c78c DL |
1417 | if (!pts) |
1418 | return 0; | |
3c26f34e | 1419 | |
1420 | if (!access("/dev/pts/ptmx", F_OK) && umount("/dev/pts")) { | |
36eb9bde | 1421 | SYSERROR("failed to umount 'dev/pts'"); |
3c26f34e | 1422 | return -1; |
1423 | } | |
1424 | ||
7e40254a JTLB |
1425 | if (mkdir("/dev/pts", 0755)) { |
1426 | if ( errno != EEXIST ) { | |
1427 | SYSERROR("failed to create '/dev/pts'"); | |
1428 | return -1; | |
1429 | } | |
1430 | } | |
1431 | ||
a6afdde9 | 1432 | if (mount("devpts", "/dev/pts", "devpts", MS_MGC_VAL, |
67e5a20a | 1433 | "newinstance,ptmxmode=0666,mode=0620,gid=5")) { |
36eb9bde | 1434 | SYSERROR("failed to mount a new instance of '/dev/pts'"); |
3c26f34e | 1435 | return -1; |
1436 | } | |
1437 | ||
3c26f34e | 1438 | if (access("/dev/ptmx", F_OK)) { |
1439 | if (!symlink("/dev/pts/ptmx", "/dev/ptmx")) | |
1440 | goto out; | |
36eb9bde | 1441 | SYSERROR("failed to symlink '/dev/pts/ptmx'->'/dev/ptmx'"); |
3c26f34e | 1442 | return -1; |
1443 | } | |
1444 | ||
77890c6d SW |
1445 | if (realpath("/dev/ptmx", target) && !strcmp(target, "/dev/pts/ptmx")) |
1446 | goto out; | |
1447 | ||
3c26f34e | 1448 | /* fallback here, /dev/pts/ptmx exists just mount bind */ |
1449 | if (mount("/dev/pts/ptmx", "/dev/ptmx", "none", MS_BIND, 0)) { | |
36eb9bde | 1450 | SYSERROR("mount failed '/dev/pts/ptmx'->'/dev/ptmx'"); |
3c26f34e | 1451 | return -1; |
1452 | } | |
cd54d859 DL |
1453 | |
1454 | INFO("created new pts instance"); | |
d852c78c | 1455 | |
3c26f34e | 1456 | out: |
1457 | return 0; | |
1458 | } | |
1459 | ||
cccc74b5 DL |
1460 | static int setup_personality(int persona) |
1461 | { | |
6ff05e18 | 1462 | #if HAVE_SYS_PERSONALITY_H |
cccc74b5 DL |
1463 | if (persona == -1) |
1464 | return 0; | |
1465 | ||
1466 | if (personality(persona) < 0) { | |
1467 | SYSERROR("failed to set personality to '0x%x'", persona); | |
1468 | return -1; | |
1469 | } | |
1470 | ||
1471 | INFO("set personality to '0x%x'", persona); | |
6ff05e18 | 1472 | #endif |
cccc74b5 DL |
1473 | |
1474 | return 0; | |
1475 | } | |
1476 | ||
7c6ef2a2 | 1477 | static int setup_dev_console(const struct lxc_rootfs *rootfs, |
33fcb7a0 | 1478 | const struct lxc_console *console) |
6e590161 | 1479 | { |
63376d7d DL |
1480 | char path[MAXPATHLEN]; |
1481 | struct stat s; | |
7c6ef2a2 | 1482 | int ret; |
52e35957 | 1483 | |
7c6ef2a2 SH |
1484 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs->mount); |
1485 | if (ret >= sizeof(path)) { | |
959aee9c | 1486 | ERROR("console path too long"); |
7c6ef2a2 SH |
1487 | return -1; |
1488 | } | |
52e35957 | 1489 | |
63376d7d | 1490 | if (access(path, F_OK)) { |
466978b0 | 1491 | WARN("rootfs specified but no console found at '%s'", path); |
63376d7d | 1492 | return 0; |
52e35957 DL |
1493 | } |
1494 | ||
b5159817 DE |
1495 | if (console->master < 0) { |
1496 | INFO("no console"); | |
f78a1f32 DL |
1497 | return 0; |
1498 | } | |
ed502555 | 1499 | |
63376d7d DL |
1500 | if (stat(path, &s)) { |
1501 | SYSERROR("failed to stat '%s'", path); | |
1502 | return -1; | |
1503 | } | |
1504 | ||
1505 | if (chmod(console->name, s.st_mode)) { | |
1506 | SYSERROR("failed to set mode '0%o' to '%s'", | |
1507 | s.st_mode, console->name); | |
1508 | return -1; | |
1509 | } | |
13954cce | 1510 | |
592fd47a | 1511 | if (safe_mount(console->name, path, "none", MS_BIND, 0, rootfs->mount)) { |
63376d7d | 1512 | ERROR("failed to mount '%s' on '%s'", console->name, path); |
6e590161 | 1513 | return -1; |
1514 | } | |
1515 | ||
63376d7d | 1516 | INFO("console has been setup"); |
7c6ef2a2 SH |
1517 | return 0; |
1518 | } | |
1519 | ||
1520 | static int setup_ttydir_console(const struct lxc_rootfs *rootfs, | |
1521 | const struct lxc_console *console, | |
1522 | char *ttydir) | |
1523 | { | |
1524 | char path[MAXPATHLEN], lxcpath[MAXPATHLEN]; | |
1525 | int ret; | |
1526 | ||
1527 | /* create rootfs/dev/<ttydir> directory */ | |
1528 | ret = snprintf(path, sizeof(path), "%s/dev/%s", rootfs->mount, | |
1529 | ttydir); | |
1530 | if (ret >= sizeof(path)) | |
1531 | return -1; | |
1532 | ret = mkdir(path, 0755); | |
1533 | if (ret && errno != EEXIST) { | |
959aee9c | 1534 | SYSERROR("failed with errno %d to create %s", errno, path); |
7c6ef2a2 SH |
1535 | return -1; |
1536 | } | |
959aee9c | 1537 | INFO("created %s", path); |
7c6ef2a2 SH |
1538 | |
1539 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/dev/%s/console", | |
1540 | rootfs->mount, ttydir); | |
1541 | if (ret >= sizeof(lxcpath)) { | |
959aee9c | 1542 | ERROR("console path too long"); |
7c6ef2a2 SH |
1543 | return -1; |
1544 | } | |
1545 | ||
1546 | snprintf(path, sizeof(path), "%s/dev/console", rootfs->mount); | |
1547 | ret = unlink(path); | |
1548 | if (ret && errno != ENOENT) { | |
959aee9c | 1549 | SYSERROR("error unlinking %s", path); |
7c6ef2a2 SH |
1550 | return -1; |
1551 | } | |
1552 | ||
1553 | ret = creat(lxcpath, 0660); | |
1554 | if (ret==-1 && errno != EEXIST) { | |
959aee9c | 1555 | SYSERROR("error %d creating %s", errno, lxcpath); |
7c6ef2a2 SH |
1556 | return -1; |
1557 | } | |
4d44e274 SH |
1558 | if (ret >= 0) |
1559 | close(ret); | |
7c6ef2a2 | 1560 | |
b5159817 DE |
1561 | if (console->master < 0) { |
1562 | INFO("no console"); | |
7c6ef2a2 SH |
1563 | return 0; |
1564 | } | |
1565 | ||
592fd47a | 1566 | if (safe_mount(console->name, lxcpath, "none", MS_BIND, 0, rootfs->mount)) { |
7c6ef2a2 SH |
1567 | ERROR("failed to mount '%s' on '%s'", console->name, lxcpath); |
1568 | return -1; | |
1569 | } | |
1570 | ||
1571 | /* create symlink from rootfs/dev/console to 'lxc/console' */ | |
9ba8130c SH |
1572 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/console", ttydir); |
1573 | if (ret >= sizeof(lxcpath)) { | |
1574 | ERROR("lxc/console path too long"); | |
1575 | return -1; | |
1576 | } | |
7c6ef2a2 SH |
1577 | ret = symlink(lxcpath, path); |
1578 | if (ret) { | |
1579 | SYSERROR("failed to create symlink for console"); | |
1580 | return -1; | |
1581 | } | |
1582 | ||
1583 | INFO("console has been setup on %s", lxcpath); | |
cd54d859 | 1584 | |
6e590161 | 1585 | return 0; |
1586 | } | |
1587 | ||
7c6ef2a2 SH |
1588 | static int setup_console(const struct lxc_rootfs *rootfs, |
1589 | const struct lxc_console *console, | |
1590 | char *ttydir) | |
1591 | { | |
1592 | /* We don't have a rootfs, /dev/console will be shared */ | |
1593 | if (!rootfs->path) | |
1594 | return 0; | |
1595 | if (!ttydir) | |
1596 | return setup_dev_console(rootfs, console); | |
1597 | ||
1598 | return setup_ttydir_console(rootfs, console, ttydir); | |
1599 | } | |
1600 | ||
1bd051a6 SH |
1601 | static int setup_kmsg(const struct lxc_rootfs *rootfs, |
1602 | const struct lxc_console *console) | |
1603 | { | |
1604 | char kpath[MAXPATHLEN]; | |
1605 | int ret; | |
1606 | ||
222fea5a DE |
1607 | if (!rootfs->path) |
1608 | return 0; | |
1bd051a6 SH |
1609 | ret = snprintf(kpath, sizeof(kpath), "%s/dev/kmsg", rootfs->mount); |
1610 | if (ret < 0 || ret >= sizeof(kpath)) | |
1611 | return -1; | |
1612 | ||
1613 | ret = unlink(kpath); | |
1614 | if (ret && errno != ENOENT) { | |
959aee9c | 1615 | SYSERROR("error unlinking %s", kpath); |
1bd051a6 SH |
1616 | return -1; |
1617 | } | |
1618 | ||
1619 | ret = symlink("console", kpath); | |
1620 | if (ret) { | |
1621 | SYSERROR("failed to create symlink for kmsg"); | |
1622 | return -1; | |
1623 | } | |
1624 | ||
1625 | return 0; | |
1626 | } | |
1627 | ||
998ac676 RT |
1628 | static void parse_mntopt(char *opt, unsigned long *flags, char **data) |
1629 | { | |
1630 | struct mount_opt *mo; | |
1631 | ||
1632 | /* If opt is found in mount_opt, set or clear flags. | |
1633 | * Otherwise append it to data. */ | |
1634 | ||
1635 | for (mo = &mount_opt[0]; mo->name != NULL; mo++) { | |
1636 | if (!strncmp(opt, mo->name, strlen(mo->name))) { | |
1637 | if (mo->clear) | |
1638 | *flags &= ~mo->flag; | |
1639 | else | |
1640 | *flags |= mo->flag; | |
1641 | return; | |
1642 | } | |
1643 | } | |
1644 | ||
1645 | if (strlen(*data)) | |
1646 | strcat(*data, ","); | |
1647 | strcat(*data, opt); | |
1648 | } | |
1649 | ||
a17b1e65 | 1650 | int parse_mntopts(const char *mntopts, unsigned long *mntflags, |
998ac676 RT |
1651 | char **mntdata) |
1652 | { | |
1653 | char *s, *data; | |
1654 | char *p, *saveptr = NULL; | |
1655 | ||
911324ef | 1656 | *mntdata = NULL; |
91656ce5 | 1657 | *mntflags = 0L; |
911324ef DL |
1658 | |
1659 | if (!mntopts) | |
998ac676 RT |
1660 | return 0; |
1661 | ||
911324ef | 1662 | s = strdup(mntopts); |
998ac676 | 1663 | if (!s) { |
36eb9bde | 1664 | SYSERROR("failed to allocate memory"); |
998ac676 RT |
1665 | return -1; |
1666 | } | |
1667 | ||
1668 | data = malloc(strlen(s) + 1); | |
1669 | if (!data) { | |
36eb9bde | 1670 | SYSERROR("failed to allocate memory"); |
998ac676 RT |
1671 | free(s); |
1672 | return -1; | |
1673 | } | |
1674 | *data = 0; | |
1675 | ||
1676 | for (p = strtok_r(s, ",", &saveptr); p != NULL; | |
1677 | p = strtok_r(NULL, ",", &saveptr)) | |
1678 | parse_mntopt(p, mntflags, &data); | |
1679 | ||
1680 | if (*data) | |
1681 | *mntdata = data; | |
1682 | else | |
1683 | free(data); | |
1684 | free(s); | |
1685 | ||
1686 | return 0; | |
1687 | } | |
1688 | ||
6fd5e769 SH |
1689 | static void null_endofword(char *word) |
1690 | { | |
1691 | while (*word && *word != ' ' && *word != '\t') | |
1692 | word++; | |
1693 | *word = '\0'; | |
1694 | } | |
1695 | ||
1696 | /* | |
1697 | * skip @nfields spaces in @src | |
1698 | */ | |
1699 | static char *get_field(char *src, int nfields) | |
1700 | { | |
1701 | char *p = src; | |
1702 | int i; | |
1703 | ||
1704 | for (i = 0; i < nfields; i++) { | |
1705 | while (*p && *p != ' ' && *p != '\t') | |
1706 | p++; | |
1707 | if (!*p) | |
1708 | break; | |
1709 | p++; | |
1710 | } | |
1711 | return p; | |
1712 | } | |
1713 | ||
911324ef DL |
1714 | static int mount_entry(const char *fsname, const char *target, |
1715 | const char *fstype, unsigned long mountflags, | |
592fd47a | 1716 | const char *data, int optional, const char *rootfs) |
911324ef | 1717 | { |
614305f3 | 1718 | #ifdef HAVE_STATVFS |
2938f7c8 | 1719 | struct statvfs sb; |
614305f3 | 1720 | #endif |
2938f7c8 | 1721 | |
592fd47a | 1722 | if (safe_mount(fsname, target, fstype, mountflags & ~MS_REMOUNT, data, rootfs)) { |
1fc64d22 SG |
1723 | if (optional) { |
1724 | INFO("failed to mount '%s' on '%s' (optional): %s", fsname, | |
1725 | target, strerror(errno)); | |
1726 | return 0; | |
1727 | } | |
1728 | else { | |
1729 | SYSERROR("failed to mount '%s' on '%s'", fsname, target); | |
1730 | return -1; | |
1731 | } | |
911324ef DL |
1732 | } |
1733 | ||
1734 | if ((mountflags & MS_REMOUNT) || (mountflags & MS_BIND)) { | |
2938f7c8 SH |
1735 | DEBUG("remounting %s on %s to respect bind or remount options", |
1736 | fsname ? fsname : "(none)", target ? target : "(none)"); | |
7c5b6e7c AS |
1737 | unsigned long rqd_flags = 0; |
1738 | if (mountflags & MS_RDONLY) | |
1739 | rqd_flags |= MS_RDONLY; | |
614305f3 | 1740 | #ifdef HAVE_STATVFS |
2938f7c8 | 1741 | if (statvfs(fsname, &sb) == 0) { |
7c5b6e7c | 1742 | unsigned long required_flags = rqd_flags; |
2938f7c8 SH |
1743 | if (sb.f_flag & MS_NOSUID) |
1744 | required_flags |= MS_NOSUID; | |
1745 | if (sb.f_flag & MS_NODEV) | |
1746 | required_flags |= MS_NODEV; | |
1747 | if (sb.f_flag & MS_RDONLY) | |
1748 | required_flags |= MS_RDONLY; | |
1749 | if (sb.f_flag & MS_NOEXEC) | |
1750 | required_flags |= MS_NOEXEC; | |
1751 | DEBUG("(at remount) flags for %s was %lu, required extra flags are %lu", fsname, sb.f_flag, required_flags); | |
1752 | /* | |
1753 | * If this was a bind mount request, and required_flags | |
1754 | * does not have any flags which are not already in | |
1755 | * mountflags, then skip the remount | |
1756 | */ | |
1757 | if (!(mountflags & MS_REMOUNT)) { | |
7c5b6e7c | 1758 | if (!(required_flags & ~mountflags) && rqd_flags == 0) { |
2938f7c8 SH |
1759 | DEBUG("mountflags already was %lu, skipping remount", |
1760 | mountflags); | |
1761 | goto skipremount; | |
1762 | } | |
1763 | } | |
1764 | mountflags |= required_flags; | |
6fd5e769 | 1765 | } |
614305f3 | 1766 | #endif |
911324ef DL |
1767 | |
1768 | if (mount(fsname, target, fstype, | |
592fd47a | 1769 | mountflags | MS_REMOUNT, data) < 0) { |
1fc64d22 SG |
1770 | if (optional) { |
1771 | INFO("failed to mount '%s' on '%s' (optional): %s", | |
1772 | fsname, target, strerror(errno)); | |
1773 | return 0; | |
1774 | } | |
1775 | else { | |
1776 | SYSERROR("failed to mount '%s' on '%s'", | |
1777 | fsname, target); | |
1778 | return -1; | |
1779 | } | |
911324ef DL |
1780 | } |
1781 | } | |
1782 | ||
614305f3 | 1783 | #ifdef HAVE_STATVFS |
6fd5e769 | 1784 | skipremount: |
614305f3 | 1785 | #endif |
911324ef DL |
1786 | DEBUG("mounted '%s' on '%s', type '%s'", fsname, target, fstype); |
1787 | ||
1788 | return 0; | |
1789 | } | |
1790 | ||
4e4ca161 SH |
1791 | /* |
1792 | * Remove 'optional', 'create=dir', and 'create=file' from mntopt | |
1793 | */ | |
1794 | static void cull_mntent_opt(struct mntent *mntent) | |
1795 | { | |
1796 | int i; | |
1797 | char *p, *p2; | |
1798 | char *list[] = {"create=dir", | |
1799 | "create=file", | |
1800 | "optional", | |
1801 | NULL }; | |
1802 | ||
1803 | for (i=0; list[i]; i++) { | |
1804 | if (!(p = strstr(mntent->mnt_opts, list[i]))) | |
1805 | continue; | |
1806 | p2 = strchr(p, ','); | |
1807 | if (!p2) { | |
1808 | /* no more mntopts, so just chop it here */ | |
1809 | *p = '\0'; | |
1810 | continue; | |
1811 | } | |
1812 | memmove(p, p2+1, strlen(p2+1)+1); | |
1813 | } | |
1814 | } | |
1815 | ||
4d5b72a1 NC |
1816 | static int mount_entry_create_dir_file(const struct mntent *mntent, |
1817 | const char* path) | |
0ad19a3f | 1818 | { |
4d5b72a1 | 1819 | char *pathdirname = NULL; |
608e3567 | 1820 | int ret = 0; |
34cfffb3 | 1821 | FILE *pathfile = NULL; |
911324ef | 1822 | |
34cfffb3 | 1823 | if (hasmntopt(mntent, "create=dir")) { |
4d5b72a1 NC |
1824 | if (mkdir_p(path, 0755) < 0) { |
1825 | WARN("Failed to create mount target '%s'", path); | |
34cfffb3 SG |
1826 | ret = -1; |
1827 | } | |
1828 | } | |
1829 | ||
4d5b72a1 NC |
1830 | if (hasmntopt(mntent, "create=file") && access(path, F_OK)) { |
1831 | pathdirname = strdup(path); | |
34cfffb3 | 1832 | pathdirname = dirname(pathdirname); |
119126b6 SG |
1833 | if (mkdir_p(pathdirname, 0755) < 0) { |
1834 | WARN("Failed to create target directory"); | |
1835 | } | |
4d5b72a1 | 1836 | pathfile = fopen(path, "wb"); |
34cfffb3 | 1837 | if (!pathfile) { |
4d5b72a1 | 1838 | WARN("Failed to create mount target '%s'", path); |
34cfffb3 SG |
1839 | ret = -1; |
1840 | } | |
1841 | else | |
1842 | fclose(pathfile); | |
1843 | } | |
4d5b72a1 NC |
1844 | free(pathdirname); |
1845 | return ret; | |
1846 | } | |
1847 | ||
db4aba38 | 1848 | static inline int mount_entry_on_generic(struct mntent *mntent, |
592fd47a | 1849 | const char* path, const char *rootfs) |
4d5b72a1 NC |
1850 | { |
1851 | unsigned long mntflags; | |
1852 | char *mntdata; | |
1853 | int ret; | |
1854 | bool optional = hasmntopt(mntent, "optional") != NULL; | |
1855 | ||
db4aba38 | 1856 | ret = mount_entry_create_dir_file(mntent, path); |
34cfffb3 | 1857 | |
608e3567 SH |
1858 | if (ret < 0) |
1859 | return optional ? 0 : -1; | |
1860 | ||
4e4ca161 SH |
1861 | cull_mntent_opt(mntent); |
1862 | ||
a17b1e65 SG |
1863 | if (parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata) < 0) { |
1864 | free(mntdata); | |
1865 | return -1; | |
1866 | } | |
1867 | ||
db4aba38 | 1868 | ret = mount_entry(mntent->mnt_fsname, path, mntent->mnt_type, |
592fd47a | 1869 | mntflags, mntdata, optional, rootfs); |
68c152ef | 1870 | |
911324ef DL |
1871 | free(mntdata); |
1872 | ||
1873 | return ret; | |
1874 | } | |
1875 | ||
db4aba38 NC |
1876 | static inline int mount_entry_on_systemfs(struct mntent *mntent) |
1877 | { | |
592fd47a | 1878 | return mount_entry_on_generic(mntent, mntent->mnt_dir, NULL); |
db4aba38 NC |
1879 | } |
1880 | ||
4e4ca161 | 1881 | static int mount_entry_on_absolute_rootfs(struct mntent *mntent, |
80a881b2 SH |
1882 | const struct lxc_rootfs *rootfs, |
1883 | const char *lxc_name) | |
911324ef | 1884 | { |
013bd428 | 1885 | char *aux; |
59760f5d | 1886 | char path[MAXPATHLEN]; |
80a881b2 | 1887 | int r, ret = 0, offset; |
67e571de | 1888 | const char *lxcpath; |
0ad19a3f | 1889 | |
593e8478 | 1890 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
2a59a681 SH |
1891 | if (!lxcpath) { |
1892 | ERROR("Out of memory"); | |
1893 | return -1; | |
1894 | } | |
1895 | ||
80a881b2 | 1896 | /* if rootfs->path is a blockdev path, allow container fstab to |
2a59a681 SH |
1897 | * use $lxcpath/CN/rootfs as the target prefix */ |
1898 | r = snprintf(path, MAXPATHLEN, "%s/%s/rootfs", lxcpath, lxc_name); | |
80a881b2 SH |
1899 | if (r < 0 || r >= MAXPATHLEN) |
1900 | goto skipvarlib; | |
1901 | ||
1902 | aux = strstr(mntent->mnt_dir, path); | |
1903 | if (aux) { | |
1904 | offset = strlen(path); | |
1905 | goto skipabs; | |
1906 | } | |
1907 | ||
1908 | skipvarlib: | |
013bd428 DL |
1909 | aux = strstr(mntent->mnt_dir, rootfs->path); |
1910 | if (!aux) { | |
1911 | WARN("ignoring mount point '%s'", mntent->mnt_dir); | |
db4aba38 | 1912 | return ret; |
013bd428 | 1913 | } |
80a881b2 SH |
1914 | offset = strlen(rootfs->path); |
1915 | ||
1916 | skipabs: | |
013bd428 | 1917 | |
9ba8130c | 1918 | r = snprintf(path, MAXPATHLEN, "%s/%s", rootfs->mount, |
80a881b2 SH |
1919 | aux + offset); |
1920 | if (r < 0 || r >= MAXPATHLEN) { | |
1921 | WARN("pathnme too long for '%s'", mntent->mnt_dir); | |
a17b1e65 SG |
1922 | return -1; |
1923 | } | |
1924 | ||
592fd47a | 1925 | return mount_entry_on_generic(mntent, path, rootfs->mount); |
911324ef | 1926 | } |
d330fe7b | 1927 | |
4e4ca161 | 1928 | static int mount_entry_on_relative_rootfs(struct mntent *mntent, |
911324ef DL |
1929 | const char *rootfs) |
1930 | { | |
1931 | char path[MAXPATHLEN]; | |
911324ef | 1932 | int ret; |
d330fe7b | 1933 | |
34cfffb3 | 1934 | /* relative to root mount point */ |
9ba8130c SH |
1935 | ret = snprintf(path, sizeof(path), "%s/%s", rootfs, mntent->mnt_dir); |
1936 | if (ret >= sizeof(path)) { | |
1937 | ERROR("path name too long"); | |
1938 | return -1; | |
1939 | } | |
911324ef | 1940 | |
592fd47a | 1941 | return mount_entry_on_generic(mntent, path, rootfs); |
911324ef DL |
1942 | } |
1943 | ||
80a881b2 SH |
1944 | static int mount_file_entries(const struct lxc_rootfs *rootfs, FILE *file, |
1945 | const char *lxc_name) | |
911324ef | 1946 | { |
aaf901be AM |
1947 | struct mntent mntent; |
1948 | char buf[4096]; | |
911324ef | 1949 | int ret = -1; |
e76b8764 | 1950 | |
aaf901be | 1951 | while (getmntent_r(file, &mntent, buf, sizeof(buf))) { |
e76b8764 | 1952 | |
911324ef | 1953 | if (!rootfs->path) { |
aaf901be | 1954 | if (mount_entry_on_systemfs(&mntent)) |
e76b8764 | 1955 | goto out; |
911324ef | 1956 | continue; |
e76b8764 CDC |
1957 | } |
1958 | ||
911324ef | 1959 | /* We have a separate root, mounts are relative to it */ |
aaf901be AM |
1960 | if (mntent.mnt_dir[0] != '/') { |
1961 | if (mount_entry_on_relative_rootfs(&mntent, | |
911324ef DL |
1962 | rootfs->mount)) |
1963 | goto out; | |
1964 | continue; | |
1965 | } | |
cd54d859 | 1966 | |
aaf901be | 1967 | if (mount_entry_on_absolute_rootfs(&mntent, rootfs, lxc_name)) |
911324ef | 1968 | goto out; |
0ad19a3f | 1969 | } |
cd54d859 | 1970 | |
0ad19a3f | 1971 | ret = 0; |
cd54d859 DL |
1972 | |
1973 | INFO("mount points have been setup"); | |
0ad19a3f | 1974 | out: |
e7938e9e MN |
1975 | return ret; |
1976 | } | |
1977 | ||
80a881b2 SH |
1978 | static int setup_mount(const struct lxc_rootfs *rootfs, const char *fstab, |
1979 | const char *lxc_name) | |
e7938e9e MN |
1980 | { |
1981 | FILE *file; | |
1982 | int ret; | |
1983 | ||
1984 | if (!fstab) | |
1985 | return 0; | |
1986 | ||
1987 | file = setmntent(fstab, "r"); | |
1988 | if (!file) { | |
1989 | SYSERROR("failed to use '%s'", fstab); | |
1990 | return -1; | |
1991 | } | |
1992 | ||
80a881b2 | 1993 | ret = mount_file_entries(rootfs, file, lxc_name); |
e7938e9e | 1994 | |
0ad19a3f | 1995 | endmntent(file); |
1996 | return ret; | |
1997 | } | |
1998 | ||
9fc7f8c0 | 1999 | FILE *write_mount_file(struct lxc_list *mount) |
e7938e9e MN |
2000 | { |
2001 | FILE *file; | |
2002 | struct lxc_list *iterator; | |
2003 | char *mount_entry; | |
e7938e9e MN |
2004 | |
2005 | file = tmpfile(); | |
2006 | if (!file) { | |
2007 | ERROR("tmpfile error: %m"); | |
9fc7f8c0 | 2008 | return NULL; |
e7938e9e MN |
2009 | } |
2010 | ||
2011 | lxc_list_for_each(iterator, mount) { | |
2012 | mount_entry = iterator->elem; | |
1d6b1976 | 2013 | fprintf(file, "%s\n", mount_entry); |
e7938e9e MN |
2014 | } |
2015 | ||
2016 | rewind(file); | |
9fc7f8c0 TA |
2017 | return file; |
2018 | } | |
2019 | ||
2020 | static int setup_mount_entries(const struct lxc_rootfs *rootfs, struct lxc_list *mount, | |
2021 | const char *lxc_name) | |
2022 | { | |
2023 | FILE *file; | |
2024 | int ret; | |
2025 | ||
2026 | file = write_mount_file(mount); | |
2027 | if (!file) | |
2028 | return -1; | |
e7938e9e | 2029 | |
80a881b2 | 2030 | ret = mount_file_entries(rootfs, file, lxc_name); |
e7938e9e MN |
2031 | |
2032 | fclose(file); | |
2033 | return ret; | |
2034 | } | |
2035 | ||
bab88e68 CS |
2036 | static int parse_cap(const char *cap) |
2037 | { | |
2038 | char *ptr = NULL; | |
2039 | int i, capid = -1; | |
2040 | ||
7035407c DE |
2041 | if (!strcmp(cap, "none")) |
2042 | return -2; | |
2043 | ||
bab88e68 CS |
2044 | for (i = 0; i < sizeof(caps_opt)/sizeof(caps_opt[0]); i++) { |
2045 | ||
2046 | if (strcmp(cap, caps_opt[i].name)) | |
2047 | continue; | |
2048 | ||
2049 | capid = caps_opt[i].value; | |
2050 | break; | |
2051 | } | |
2052 | ||
2053 | if (capid < 0) { | |
2054 | /* try to see if it's numeric, so the user may specify | |
2055 | * capabilities that the running kernel knows about but | |
2056 | * we don't */ | |
2057 | errno = 0; | |
2058 | capid = strtol(cap, &ptr, 10); | |
2059 | if (!ptr || *ptr != '\0' || errno != 0) | |
2060 | /* not a valid number */ | |
2061 | capid = -1; | |
2062 | else if (capid > lxc_caps_last_cap()) | |
2063 | /* we have a number but it's not a valid | |
2064 | * capability */ | |
2065 | capid = -1; | |
2066 | } | |
2067 | ||
2068 | return capid; | |
2069 | } | |
2070 | ||
0769b82a CS |
2071 | int in_caplist(int cap, struct lxc_list *caps) |
2072 | { | |
2073 | struct lxc_list *iterator; | |
2074 | int capid; | |
2075 | ||
2076 | lxc_list_for_each(iterator, caps) { | |
2077 | capid = parse_cap(iterator->elem); | |
2078 | if (capid == cap) | |
2079 | return 1; | |
2080 | } | |
2081 | ||
2082 | return 0; | |
2083 | } | |
2084 | ||
81810dd1 DL |
2085 | static int setup_caps(struct lxc_list *caps) |
2086 | { | |
2087 | struct lxc_list *iterator; | |
2088 | char *drop_entry; | |
bab88e68 | 2089 | int capid; |
81810dd1 DL |
2090 | |
2091 | lxc_list_for_each(iterator, caps) { | |
2092 | ||
2093 | drop_entry = iterator->elem; | |
2094 | ||
bab88e68 | 2095 | capid = parse_cap(drop_entry); |
d55bc1ad | 2096 | |
81810dd1 | 2097 | if (capid < 0) { |
1e11be34 DL |
2098 | ERROR("unknown capability %s", drop_entry); |
2099 | return -1; | |
81810dd1 DL |
2100 | } |
2101 | ||
2102 | DEBUG("drop capability '%s' (%d)", drop_entry, capid); | |
2103 | ||
2104 | if (prctl(PR_CAPBSET_DROP, capid, 0, 0, 0)) { | |
3ec1648d SH |
2105 | SYSERROR("failed to remove %s capability", drop_entry); |
2106 | return -1; | |
2107 | } | |
81810dd1 DL |
2108 | |
2109 | } | |
2110 | ||
1fb86a7c SH |
2111 | DEBUG("capabilities have been setup"); |
2112 | ||
2113 | return 0; | |
2114 | } | |
2115 | ||
2116 | static int dropcaps_except(struct lxc_list *caps) | |
2117 | { | |
2118 | struct lxc_list *iterator; | |
2119 | char *keep_entry; | |
1fb86a7c SH |
2120 | int i, capid; |
2121 | int numcaps = lxc_caps_last_cap() + 1; | |
959aee9c | 2122 | INFO("found %d capabilities", numcaps); |
1fb86a7c | 2123 | |
2caf9a97 SH |
2124 | if (numcaps <= 0 || numcaps > 200) |
2125 | return -1; | |
2126 | ||
1fb86a7c SH |
2127 | // caplist[i] is 1 if we keep capability i |
2128 | int *caplist = alloca(numcaps * sizeof(int)); | |
2129 | memset(caplist, 0, numcaps * sizeof(int)); | |
2130 | ||
2131 | lxc_list_for_each(iterator, caps) { | |
2132 | ||
2133 | keep_entry = iterator->elem; | |
2134 | ||
bab88e68 | 2135 | capid = parse_cap(keep_entry); |
1fb86a7c | 2136 | |
7035407c DE |
2137 | if (capid == -2) |
2138 | continue; | |
2139 | ||
1fb86a7c SH |
2140 | if (capid < 0) { |
2141 | ERROR("unknown capability %s", keep_entry); | |
2142 | return -1; | |
2143 | } | |
2144 | ||
8255688a | 2145 | DEBUG("keep capability '%s' (%d)", keep_entry, capid); |
1fb86a7c SH |
2146 | |
2147 | caplist[capid] = 1; | |
2148 | } | |
2149 | for (i=0; i<numcaps; i++) { | |
2150 | if (caplist[i]) | |
2151 | continue; | |
2152 | if (prctl(PR_CAPBSET_DROP, i, 0, 0, 0)) { | |
3ec1648d SH |
2153 | SYSERROR("failed to remove capability %d", i); |
2154 | return -1; | |
2155 | } | |
1fb86a7c SH |
2156 | } |
2157 | ||
2158 | DEBUG("capabilities have been setup"); | |
81810dd1 DL |
2159 | |
2160 | return 0; | |
2161 | } | |
2162 | ||
0ad19a3f | 2163 | static int setup_hw_addr(char *hwaddr, const char *ifname) |
2164 | { | |
2165 | struct sockaddr sockaddr; | |
2166 | struct ifreq ifr; | |
2167 | int ret, fd; | |
2168 | ||
3cfc0f3a MN |
2169 | ret = lxc_convert_mac(hwaddr, &sockaddr); |
2170 | if (ret) { | |
2171 | ERROR("mac address '%s' conversion failed : %s", | |
2172 | hwaddr, strerror(-ret)); | |
0ad19a3f | 2173 | return -1; |
2174 | } | |
2175 | ||
2176 | memcpy(ifr.ifr_name, ifname, IFNAMSIZ); | |
5da6aa8c | 2177 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
0ad19a3f | 2178 | memcpy((char *) &ifr.ifr_hwaddr, (char *) &sockaddr, sizeof(sockaddr)); |
2179 | ||
2180 | fd = socket(AF_INET, SOCK_DGRAM, 0); | |
2181 | if (fd < 0) { | |
3ab87b66 | 2182 | ERROR("socket failure : %s", strerror(errno)); |
0ad19a3f | 2183 | return -1; |
2184 | } | |
2185 | ||
2186 | ret = ioctl(fd, SIOCSIFHWADDR, &ifr); | |
2187 | close(fd); | |
2188 | if (ret) | |
3ab87b66 | 2189 | ERROR("ioctl failure : %s", strerror(errno)); |
0ad19a3f | 2190 | |
5da6aa8c | 2191 | DEBUG("mac address '%s' on '%s' has been setup", hwaddr, ifr.ifr_name); |
cd54d859 | 2192 | |
0ad19a3f | 2193 | return ret; |
2194 | } | |
2195 | ||
82d5ae15 | 2196 | static int setup_ipv4_addr(struct lxc_list *ip, int ifindex) |
0ad19a3f | 2197 | { |
82d5ae15 DL |
2198 | struct lxc_list *iterator; |
2199 | struct lxc_inetdev *inetdev; | |
3cfc0f3a | 2200 | int err; |
0ad19a3f | 2201 | |
82d5ae15 DL |
2202 | lxc_list_for_each(iterator, ip) { |
2203 | ||
2204 | inetdev = iterator->elem; | |
2205 | ||
0093bb8c DL |
2206 | err = lxc_ipv4_addr_add(ifindex, &inetdev->addr, |
2207 | &inetdev->bcast, inetdev->prefix); | |
3cfc0f3a MN |
2208 | if (err) { |
2209 | ERROR("failed to setup_ipv4_addr ifindex %d : %s", | |
2210 | ifindex, strerror(-err)); | |
82d5ae15 DL |
2211 | return -1; |
2212 | } | |
2213 | } | |
2214 | ||
2215 | return 0; | |
0ad19a3f | 2216 | } |
2217 | ||
82d5ae15 | 2218 | static int setup_ipv6_addr(struct lxc_list *ip, int ifindex) |
0ad19a3f | 2219 | { |
82d5ae15 | 2220 | struct lxc_list *iterator; |
7fa9074f | 2221 | struct lxc_inet6dev *inet6dev; |
3cfc0f3a | 2222 | int err; |
0ad19a3f | 2223 | |
82d5ae15 DL |
2224 | lxc_list_for_each(iterator, ip) { |
2225 | ||
2226 | inet6dev = iterator->elem; | |
2227 | ||
b3df193c | 2228 | err = lxc_ipv6_addr_add(ifindex, &inet6dev->addr, |
0093bb8c DL |
2229 | &inet6dev->mcast, &inet6dev->acast, |
2230 | inet6dev->prefix); | |
3cfc0f3a MN |
2231 | if (err) { |
2232 | ERROR("failed to setup_ipv6_addr ifindex %d : %s", | |
2233 | ifindex, strerror(-err)); | |
82d5ae15 | 2234 | return -1; |
3cfc0f3a | 2235 | } |
82d5ae15 DL |
2236 | } |
2237 | ||
2238 | return 0; | |
0ad19a3f | 2239 | } |
2240 | ||
82d5ae15 | 2241 | static int setup_netdev(struct lxc_netdev *netdev) |
0ad19a3f | 2242 | { |
0ad19a3f | 2243 | char ifname[IFNAMSIZ]; |
0ad19a3f | 2244 | char *current_ifname = ifname; |
3cfc0f3a | 2245 | int err; |
0ad19a3f | 2246 | |
82d5ae15 DL |
2247 | /* empty network namespace */ |
2248 | if (!netdev->ifindex) { | |
b0efbac4 | 2249 | if (netdev->flags & IFF_UP) { |
d472214b | 2250 | err = lxc_netdev_up("lo"); |
3cfc0f3a MN |
2251 | if (err) { |
2252 | ERROR("failed to set the loopback up : %s", | |
2253 | strerror(-err)); | |
82d5ae15 DL |
2254 | return -1; |
2255 | } | |
82d5ae15 | 2256 | } |
40790553 SH |
2257 | if (netdev->type != LXC_NET_VETH) |
2258 | return 0; | |
2259 | netdev->ifindex = if_nametoindex(netdev->name); | |
0ad19a3f | 2260 | } |
13954cce | 2261 | |
b466dc33 | 2262 | /* get the new ifindex in case of physical netdev */ |
40790553 | 2263 | if (netdev->type == LXC_NET_PHYS) { |
b466dc33 BP |
2264 | if (!(netdev->ifindex = if_nametoindex(netdev->link))) { |
2265 | ERROR("failed to get ifindex for %s", | |
2266 | netdev->link); | |
2267 | return -1; | |
2268 | } | |
40790553 | 2269 | } |
b466dc33 | 2270 | |
82d5ae15 DL |
2271 | /* retrieve the name of the interface */ |
2272 | if (!if_indextoname(netdev->ifindex, current_ifname)) { | |
36eb9bde | 2273 | ERROR("no interface corresponding to index '%d'", |
82d5ae15 | 2274 | netdev->ifindex); |
0ad19a3f | 2275 | return -1; |
2276 | } | |
13954cce | 2277 | |
018ef520 | 2278 | /* default: let the system to choose one interface name */ |
9d083402 | 2279 | if (!netdev->name) |
fb6d9b2f DL |
2280 | netdev->name = netdev->type == LXC_NET_PHYS ? |
2281 | netdev->link : "eth%d"; | |
018ef520 | 2282 | |
82d5ae15 | 2283 | /* rename the interface name */ |
40790553 SH |
2284 | if (strcmp(ifname, netdev->name) != 0) { |
2285 | err = lxc_netdev_rename_by_name(ifname, netdev->name); | |
2286 | if (err) { | |
2287 | ERROR("failed to rename %s->%s : %s", ifname, netdev->name, | |
2288 | strerror(-err)); | |
2289 | return -1; | |
2290 | } | |
018ef520 DL |
2291 | } |
2292 | ||
2293 | /* Re-read the name of the interface because its name has changed | |
2294 | * and would be automatically allocated by the system | |
2295 | */ | |
82d5ae15 | 2296 | if (!if_indextoname(netdev->ifindex, current_ifname)) { |
018ef520 | 2297 | ERROR("no interface corresponding to index '%d'", |
82d5ae15 | 2298 | netdev->ifindex); |
018ef520 | 2299 | return -1; |
0ad19a3f | 2300 | } |
2301 | ||
82d5ae15 DL |
2302 | /* set a mac address */ |
2303 | if (netdev->hwaddr) { | |
2304 | if (setup_hw_addr(netdev->hwaddr, current_ifname)) { | |
36eb9bde | 2305 | ERROR("failed to setup hw address for '%s'", |
82d5ae15 | 2306 | current_ifname); |
0ad19a3f | 2307 | return -1; |
2308 | } | |
2309 | } | |
2310 | ||
82d5ae15 DL |
2311 | /* setup ipv4 addresses on the interface */ |
2312 | if (setup_ipv4_addr(&netdev->ipv4, netdev->ifindex)) { | |
36eb9bde | 2313 | ERROR("failed to setup ip addresses for '%s'", |
0ad19a3f | 2314 | ifname); |
2315 | return -1; | |
2316 | } | |
2317 | ||
82d5ae15 DL |
2318 | /* setup ipv6 addresses on the interface */ |
2319 | if (setup_ipv6_addr(&netdev->ipv6, netdev->ifindex)) { | |
36eb9bde | 2320 | ERROR("failed to setup ipv6 addresses for '%s'", |
0ad19a3f | 2321 | ifname); |
2322 | return -1; | |
2323 | } | |
2324 | ||
82d5ae15 | 2325 | /* set the network device up */ |
b0efbac4 | 2326 | if (netdev->flags & IFF_UP) { |
3cfc0f3a MN |
2327 | int err; |
2328 | ||
d472214b | 2329 | err = lxc_netdev_up(current_ifname); |
3cfc0f3a MN |
2330 | if (err) { |
2331 | ERROR("failed to set '%s' up : %s", current_ifname, | |
2332 | strerror(-err)); | |
0ad19a3f | 2333 | return -1; |
2334 | } | |
2335 | ||
2336 | /* the network is up, make the loopback up too */ | |
d472214b | 2337 | err = lxc_netdev_up("lo"); |
3cfc0f3a MN |
2338 | if (err) { |
2339 | ERROR("failed to set the loopback up : %s", | |
2340 | strerror(-err)); | |
0ad19a3f | 2341 | return -1; |
2342 | } | |
2343 | } | |
2344 | ||
f8fee0e2 MK |
2345 | /* We can only set up the default routes after bringing |
2346 | * up the interface, sine bringing up the interface adds | |
2347 | * the link-local routes and we can't add a default | |
2348 | * route if the gateway is not reachable. */ | |
2349 | ||
2350 | /* setup ipv4 gateway on the interface */ | |
2351 | if (netdev->ipv4_gateway) { | |
2352 | if (!(netdev->flags & IFF_UP)) { | |
2353 | ERROR("Cannot add ipv4 gateway for %s when not bringing up the interface", ifname); | |
2354 | return -1; | |
2355 | } | |
2356 | ||
2357 | if (lxc_list_empty(&netdev->ipv4)) { | |
2358 | ERROR("Cannot add ipv4 gateway for %s when not assigning an address", ifname); | |
2359 | return -1; | |
2360 | } | |
2361 | ||
2362 | err = lxc_ipv4_gateway_add(netdev->ifindex, netdev->ipv4_gateway); | |
2363 | if (err) { | |
fc739df5 SG |
2364 | err = lxc_ipv4_dest_add(netdev->ifindex, netdev->ipv4_gateway); |
2365 | if (err) { | |
2366 | ERROR("failed to add ipv4 dest for '%s': %s", | |
2367 | ifname, strerror(-err)); | |
2368 | } | |
2369 | ||
2370 | err = lxc_ipv4_gateway_add(netdev->ifindex, netdev->ipv4_gateway); | |
2371 | if (err) { | |
2372 | ERROR("failed to setup ipv4 gateway for '%s': %s", | |
2373 | ifname, strerror(-err)); | |
2374 | if (netdev->ipv4_gateway_auto) { | |
2375 | char buf[INET_ADDRSTRLEN]; | |
2376 | inet_ntop(AF_INET, netdev->ipv4_gateway, buf, sizeof(buf)); | |
2377 | ERROR("tried to set autodetected ipv4 gateway '%s'", buf); | |
2378 | } | |
2379 | return -1; | |
19a26f82 | 2380 | } |
f8fee0e2 MK |
2381 | } |
2382 | } | |
2383 | ||
2384 | /* setup ipv6 gateway on the interface */ | |
2385 | if (netdev->ipv6_gateway) { | |
2386 | if (!(netdev->flags & IFF_UP)) { | |
2387 | ERROR("Cannot add ipv6 gateway for %s when not bringing up the interface", ifname); | |
2388 | return -1; | |
2389 | } | |
2390 | ||
2391 | if (lxc_list_empty(&netdev->ipv6) && !IN6_IS_ADDR_LINKLOCAL(netdev->ipv6_gateway)) { | |
2392 | ERROR("Cannot add ipv6 gateway for %s when not assigning an address", ifname); | |
2393 | return -1; | |
2394 | } | |
2395 | ||
2396 | err = lxc_ipv6_gateway_add(netdev->ifindex, netdev->ipv6_gateway); | |
2397 | if (err) { | |
fc739df5 SG |
2398 | err = lxc_ipv6_dest_add(netdev->ifindex, netdev->ipv6_gateway); |
2399 | if (err) { | |
2400 | ERROR("failed to add ipv6 dest for '%s': %s", | |
f8fee0e2 | 2401 | ifname, strerror(-err)); |
19a26f82 | 2402 | } |
fc739df5 SG |
2403 | |
2404 | err = lxc_ipv6_gateway_add(netdev->ifindex, netdev->ipv6_gateway); | |
2405 | if (err) { | |
2406 | ERROR("failed to setup ipv6 gateway for '%s': %s", | |
2407 | ifname, strerror(-err)); | |
2408 | if (netdev->ipv6_gateway_auto) { | |
2409 | char buf[INET6_ADDRSTRLEN]; | |
2410 | inet_ntop(AF_INET6, netdev->ipv6_gateway, buf, sizeof(buf)); | |
2411 | ERROR("tried to set autodetected ipv6 gateway '%s'", buf); | |
2412 | } | |
2413 | return -1; | |
2414 | } | |
f8fee0e2 MK |
2415 | } |
2416 | } | |
2417 | ||
cd54d859 DL |
2418 | DEBUG("'%s' has been setup", current_ifname); |
2419 | ||
0ad19a3f | 2420 | return 0; |
2421 | } | |
2422 | ||
5f4535a3 | 2423 | static int setup_network(struct lxc_list *network) |
0ad19a3f | 2424 | { |
82d5ae15 | 2425 | struct lxc_list *iterator; |
82d5ae15 | 2426 | struct lxc_netdev *netdev; |
0ad19a3f | 2427 | |
5f4535a3 | 2428 | lxc_list_for_each(iterator, network) { |
cd54d859 | 2429 | |
5f4535a3 | 2430 | netdev = iterator->elem; |
82d5ae15 DL |
2431 | |
2432 | if (setup_netdev(netdev)) { | |
2433 | ERROR("failed to setup netdev"); | |
2434 | return -1; | |
2435 | } | |
2436 | } | |
cd54d859 | 2437 | |
5f4535a3 DL |
2438 | if (!lxc_list_empty(network)) |
2439 | INFO("network has been setup"); | |
cd54d859 DL |
2440 | |
2441 | return 0; | |
0ad19a3f | 2442 | } |
2443 | ||
2af6bd1b SH |
2444 | /* try to move physical nics to the init netns */ |
2445 | void restore_phys_nics_to_netns(int netnsfd, struct lxc_conf *conf) | |
2446 | { | |
2447 | int i, ret, oldfd; | |
2448 | char path[MAXPATHLEN]; | |
2449 | ||
2450 | if (netnsfd < 0) | |
2451 | return; | |
2452 | ||
2453 | ret = snprintf(path, MAXPATHLEN, "/proc/self/ns/net"); | |
2454 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2455 | WARN("Failed to open monitor netns fd"); | |
2456 | return; | |
2457 | } | |
2458 | if ((oldfd = open(path, O_RDONLY)) < 0) { | |
2459 | SYSERROR("Failed to open monitor netns fd"); | |
2460 | return; | |
2461 | } | |
2462 | if (setns(netnsfd, 0) != 0) { | |
2463 | SYSERROR("Failed to enter container netns to reset nics"); | |
2464 | close(oldfd); | |
2465 | return; | |
2466 | } | |
2467 | for (i=0; i<conf->num_savednics; i++) { | |
2468 | struct saved_nic *s = &conf->saved_nics[i]; | |
8d357196 | 2469 | if (lxc_netdev_move_by_index(s->ifindex, 1, NULL)) |
2af6bd1b SH |
2470 | WARN("Error moving nic index:%d back to host netns", |
2471 | s->ifindex); | |
2472 | } | |
2473 | if (setns(oldfd, 0) != 0) | |
2474 | SYSERROR("Failed to re-enter monitor's netns"); | |
2475 | close(oldfd); | |
2476 | } | |
2477 | ||
2478 | void lxc_rename_phys_nics_on_shutdown(int netnsfd, struct lxc_conf *conf) | |
7b35f3d6 SH |
2479 | { |
2480 | int i; | |
2481 | ||
2af6bd1b SH |
2482 | if (conf->num_savednics == 0) |
2483 | return; | |
2484 | ||
7b35f3d6 | 2485 | INFO("running to reset %d nic names", conf->num_savednics); |
2af6bd1b | 2486 | restore_phys_nics_to_netns(netnsfd, conf); |
7b35f3d6 SH |
2487 | for (i=0; i<conf->num_savednics; i++) { |
2488 | struct saved_nic *s = &conf->saved_nics[i]; | |
959aee9c | 2489 | INFO("resetting nic %d to %s", s->ifindex, s->orig_name); |
7b35f3d6 SH |
2490 | lxc_netdev_rename_by_index(s->ifindex, s->orig_name); |
2491 | free(s->orig_name); | |
2492 | } | |
2493 | conf->num_savednics = 0; | |
7b35f3d6 SH |
2494 | } |
2495 | ||
ae9242c8 SH |
2496 | static char *default_rootfs_mount = LXCROOTFSMOUNT; |
2497 | ||
7b379ab3 | 2498 | struct lxc_conf *lxc_conf_init(void) |
089cd8b8 | 2499 | { |
7b379ab3 | 2500 | struct lxc_conf *new; |
26ddeedd | 2501 | int i; |
7b379ab3 MN |
2502 | |
2503 | new = malloc(sizeof(*new)); | |
2504 | if (!new) { | |
2505 | ERROR("lxc_conf_init : %m"); | |
2506 | return NULL; | |
2507 | } | |
2508 | memset(new, 0, sizeof(*new)); | |
2509 | ||
b40a606e | 2510 | new->loglevel = LXC_LOG_PRIORITY_NOTSET; |
cccc74b5 | 2511 | new->personality = -1; |
124fa0a8 | 2512 | new->autodev = 1; |
596a818d DE |
2513 | new->console.log_path = NULL; |
2514 | new->console.log_fd = -1; | |
28a4b0e5 | 2515 | new->console.path = NULL; |
63376d7d | 2516 | new->console.peer = -1; |
b5159817 DE |
2517 | new->console.peerpty.busy = -1; |
2518 | new->console.peerpty.master = -1; | |
2519 | new->console.peerpty.slave = -1; | |
63376d7d DL |
2520 | new->console.master = -1; |
2521 | new->console.slave = -1; | |
2522 | new->console.name[0] = '\0'; | |
d2e30e99 | 2523 | new->maincmd_fd = -1; |
76a26f55 | 2524 | new->nbd_idx = -1; |
54c30e29 | 2525 | new->rootfs.mount = strdup(default_rootfs_mount); |
53f3f048 SH |
2526 | if (!new->rootfs.mount) { |
2527 | ERROR("lxc_conf_init : %m"); | |
2528 | free(new); | |
2529 | return NULL; | |
2530 | } | |
d89de239 | 2531 | new->kmsg = 0; |
858377e4 | 2532 | new->logfd = -1; |
7b379ab3 MN |
2533 | lxc_list_init(&new->cgroup); |
2534 | lxc_list_init(&new->network); | |
2535 | lxc_list_init(&new->mount_list); | |
81810dd1 | 2536 | lxc_list_init(&new->caps); |
1fb86a7c | 2537 | lxc_list_init(&new->keepcaps); |
f6d3e3e4 | 2538 | lxc_list_init(&new->id_map); |
f979ac15 | 2539 | lxc_list_init(&new->includes); |
4184c3e1 | 2540 | lxc_list_init(&new->aliens); |
7c661726 | 2541 | lxc_list_init(&new->environment); |
26ddeedd SH |
2542 | for (i=0; i<NUM_LXC_HOOKS; i++) |
2543 | lxc_list_init(&new->hooks[i]); | |
ee1e7aa0 | 2544 | lxc_list_init(&new->groups); |
fe4de9a6 DE |
2545 | new->lsm_aa_profile = NULL; |
2546 | new->lsm_se_context = NULL; | |
5112cd70 | 2547 | new->tmp_umount_proc = 0; |
7b379ab3 | 2548 | |
9f30a190 MM |
2549 | for (i = 0; i < LXC_NS_MAX; i++) |
2550 | new->inherit_ns_fd[i] = -1; | |
2551 | ||
72bb04e4 PT |
2552 | /* if running in a new user namespace, init and COMMAND |
2553 | * default to running as UID/GID 0 when using lxc-execute */ | |
2554 | new->init_uid = 0; | |
2555 | new->init_gid = 0; | |
2556 | ||
7b379ab3 | 2557 | return new; |
089cd8b8 DL |
2558 | } |
2559 | ||
a589434e | 2560 | static int instantiate_veth(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2561 | { |
8634bc19 | 2562 | char veth1buf[IFNAMSIZ], *veth1; |
0e391e57 | 2563 | char veth2buf[IFNAMSIZ], *veth2; |
e54864d3 | 2564 | int err, mtu = 0; |
13954cce | 2565 | |
8bee8851 | 2566 | if (netdev->priv.veth_attr.pair) { |
e892973e | 2567 | veth1 = netdev->priv.veth_attr.pair; |
8bee8851 WB |
2568 | if (handler->conf->reboot) |
2569 | lxc_netdev_delete_by_name(veth1); | |
2570 | } else { | |
9ba8130c SH |
2571 | err = snprintf(veth1buf, sizeof(veth1buf), "vethXXXXXX"); |
2572 | if (err >= sizeof(veth1buf)) { /* can't *really* happen, but... */ | |
2573 | ERROR("veth1 name too long"); | |
2574 | return -1; | |
2575 | } | |
a0265685 | 2576 | veth1 = lxc_mkifname(veth1buf); |
ad40563e ÇO |
2577 | if (!veth1) { |
2578 | ERROR("failed to allocate a temporary name"); | |
2579 | return -1; | |
2580 | } | |
74a2b586 JK |
2581 | /* store away for deconf */ |
2582 | memcpy(netdev->priv.veth_attr.veth1, veth1, IFNAMSIZ); | |
8634bc19 | 2583 | } |
82d5ae15 | 2584 | |
0e391e57 | 2585 | snprintf(veth2buf, sizeof(veth2buf), "vethXXXXXX"); |
a0265685 | 2586 | veth2 = lxc_mkifname(veth2buf); |
ad40563e | 2587 | if (!veth2) { |
82d5ae15 | 2588 | ERROR("failed to allocate a temporary name"); |
ad40563e | 2589 | goto out_delete; |
0ad19a3f | 2590 | } |
2591 | ||
3cfc0f3a MN |
2592 | err = lxc_veth_create(veth1, veth2); |
2593 | if (err) { | |
2e2d6a7b | 2594 | ERROR("failed to create veth pair (%s and %s): %s", veth1, veth2, |
3cfc0f3a | 2595 | strerror(-err)); |
ad40563e | 2596 | goto out_delete; |
0ad19a3f | 2597 | } |
13954cce | 2598 | |
49684c0b CS |
2599 | /* changing the high byte of the mac address to 0xfe, the bridge interface |
2600 | * will always keep the host's mac address and not take the mac address | |
2601 | * of a container */ | |
2602 | err = setup_private_host_hw_addr(veth1); | |
2603 | if (err) { | |
2e2d6a7b | 2604 | ERROR("failed to change mac address of host interface '%s': %s", |
49684c0b CS |
2605 | veth1, strerror(-err)); |
2606 | goto out_delete; | |
2607 | } | |
2608 | ||
af651aa9 SN |
2609 | netdev->ifindex = if_nametoindex(veth2); |
2610 | if (!netdev->ifindex) { | |
2611 | ERROR("failed to retrieve the index for %s", veth2); | |
2612 | goto out_delete; | |
2613 | } | |
2614 | ||
82d5ae15 | 2615 | if (netdev->mtu) { |
e54864d3 NC |
2616 | mtu = atoi(netdev->mtu); |
2617 | } else if (netdev->link) { | |
af651aa9 | 2618 | mtu = netdev_get_mtu(netdev->ifindex); |
e54864d3 NC |
2619 | } |
2620 | ||
2621 | if (mtu) { | |
2622 | err = lxc_netdev_set_mtu(veth1, mtu); | |
3cfc0f3a | 2623 | if (!err) |
e54864d3 | 2624 | err = lxc_netdev_set_mtu(veth2, mtu); |
3cfc0f3a | 2625 | if (err) { |
e54864d3 NC |
2626 | ERROR("failed to set mtu '%i' for veth pair (%s and %s): %s", |
2627 | mtu, veth1, veth2, strerror(-err)); | |
eb14c10a | 2628 | goto out_delete; |
75d09f83 DL |
2629 | } |
2630 | } | |
2631 | ||
3cfc0f3a MN |
2632 | if (netdev->link) { |
2633 | err = lxc_bridge_attach(netdev->link, veth1); | |
2634 | if (err) { | |
2e2d6a7b | 2635 | ERROR("failed to attach '%s' to the bridge '%s': %s", |
3cfc0f3a MN |
2636 | veth1, netdev->link, strerror(-err)); |
2637 | goto out_delete; | |
2638 | } | |
eb14c10a DL |
2639 | } |
2640 | ||
d472214b | 2641 | err = lxc_netdev_up(veth1); |
6e35af2e DL |
2642 | if (err) { |
2643 | ERROR("failed to set %s up : %s", veth1, strerror(-err)); | |
2644 | goto out_delete; | |
0ad19a3f | 2645 | } |
2646 | ||
e3b4c4c4 | 2647 | if (netdev->upscript) { |
751d9dcd DL |
2648 | err = run_script(handler->name, "net", netdev->upscript, "up", |
2649 | "veth", veth1, (char*) NULL); | |
2650 | if (err) | |
e3b4c4c4 | 2651 | goto out_delete; |
e3b4c4c4 ST |
2652 | } |
2653 | ||
a589434e | 2654 | DEBUG("instantiated veth '%s/%s', index is '%d'", |
82d5ae15 DL |
2655 | veth1, veth2, netdev->ifindex); |
2656 | ||
6ab9ab6d | 2657 | return 0; |
eb14c10a DL |
2658 | |
2659 | out_delete: | |
b84f58b9 | 2660 | lxc_netdev_delete_by_name(veth1); |
f10fad2f | 2661 | if (!netdev->priv.veth_attr.pair) |
ad40563e | 2662 | free(veth1); |
f10fad2f | 2663 | free(veth2); |
6ab9ab6d | 2664 | return -1; |
13954cce | 2665 | } |
d957ae2d | 2666 | |
74a2b586 JK |
2667 | static int shutdown_veth(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2668 | { | |
2669 | char *veth1; | |
2670 | int err; | |
2671 | ||
2672 | if (netdev->priv.veth_attr.pair) | |
2673 | veth1 = netdev->priv.veth_attr.pair; | |
2674 | else | |
2675 | veth1 = netdev->priv.veth_attr.veth1; | |
2676 | ||
2677 | if (netdev->downscript) { | |
2678 | err = run_script(handler->name, "net", netdev->downscript, | |
2679 | "down", "veth", veth1, (char*) NULL); | |
2680 | if (err) | |
2681 | return -1; | |
2682 | } | |
2683 | return 0; | |
2684 | } | |
2685 | ||
a589434e | 2686 | static int instantiate_macvlan(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2687 | { |
0e391e57 | 2688 | char peerbuf[IFNAMSIZ], *peer; |
3cfc0f3a | 2689 | int err; |
d957ae2d MT |
2690 | |
2691 | if (!netdev->link) { | |
2692 | ERROR("no link specified for macvlan netdev"); | |
2693 | return -1; | |
2694 | } | |
13954cce | 2695 | |
9ba8130c SH |
2696 | err = snprintf(peerbuf, sizeof(peerbuf), "mcXXXXXX"); |
2697 | if (err >= sizeof(peerbuf)) | |
2698 | return -1; | |
82d5ae15 | 2699 | |
a0265685 | 2700 | peer = lxc_mkifname(peerbuf); |
ad40563e | 2701 | if (!peer) { |
82d5ae15 DL |
2702 | ERROR("failed to make a temporary name"); |
2703 | return -1; | |
0ad19a3f | 2704 | } |
2705 | ||
3cfc0f3a MN |
2706 | err = lxc_macvlan_create(netdev->link, peer, |
2707 | netdev->priv.macvlan_attr.mode); | |
2708 | if (err) { | |
2709 | ERROR("failed to create macvlan interface '%s' on '%s' : %s", | |
2710 | peer, netdev->link, strerror(-err)); | |
ad40563e | 2711 | goto out; |
0ad19a3f | 2712 | } |
2713 | ||
82d5ae15 DL |
2714 | netdev->ifindex = if_nametoindex(peer); |
2715 | if (!netdev->ifindex) { | |
36eb9bde | 2716 | ERROR("failed to retrieve the index for %s", peer); |
ad40563e | 2717 | goto out; |
22ebac19 | 2718 | } |
2719 | ||
e3b4c4c4 | 2720 | if (netdev->upscript) { |
751d9dcd DL |
2721 | err = run_script(handler->name, "net", netdev->upscript, "up", |
2722 | "macvlan", netdev->link, (char*) NULL); | |
2723 | if (err) | |
ad40563e | 2724 | goto out; |
e3b4c4c4 ST |
2725 | } |
2726 | ||
a589434e | 2727 | DEBUG("instantiated macvlan '%s', index is '%d' and mode '%d'", |
e892973e | 2728 | peer, netdev->ifindex, netdev->priv.macvlan_attr.mode); |
0ad19a3f | 2729 | |
d957ae2d | 2730 | return 0; |
ad40563e ÇO |
2731 | out: |
2732 | lxc_netdev_delete_by_name(peer); | |
2733 | free(peer); | |
2734 | return -1; | |
0ad19a3f | 2735 | } |
2736 | ||
74a2b586 JK |
2737 | static int shutdown_macvlan(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2738 | { | |
2739 | int err; | |
2740 | ||
2741 | if (netdev->downscript) { | |
2742 | err = run_script(handler->name, "net", netdev->downscript, | |
2743 | "down", "macvlan", netdev->link, | |
2744 | (char*) NULL); | |
2745 | if (err) | |
2746 | return -1; | |
2747 | } | |
2748 | return 0; | |
2749 | } | |
2750 | ||
a589434e JN |
2751 | /* XXX: merge with instantiate_macvlan */ |
2752 | static int instantiate_vlan(struct lxc_handler *handler, struct lxc_netdev *netdev) | |
26c39028 JHS |
2753 | { |
2754 | char peer[IFNAMSIZ]; | |
3cfc0f3a | 2755 | int err; |
82f58d03 | 2756 | static uint16_t vlan_cntr = 0; |
26c39028 JHS |
2757 | |
2758 | if (!netdev->link) { | |
2759 | ERROR("no link specified for vlan netdev"); | |
2760 | return -1; | |
2761 | } | |
2762 | ||
82f58d03 | 2763 | err = snprintf(peer, sizeof(peer), "vlan%d-%d", netdev->priv.vlan_attr.vid, vlan_cntr++); |
9ba8130c SH |
2764 | if (err >= sizeof(peer)) { |
2765 | ERROR("peer name too long"); | |
2766 | return -1; | |
2767 | } | |
26c39028 | 2768 | |
3cfc0f3a MN |
2769 | err = lxc_vlan_create(netdev->link, peer, netdev->priv.vlan_attr.vid); |
2770 | if (err) { | |
2771 | ERROR("failed to create vlan interface '%s' on '%s' : %s", | |
2772 | peer, netdev->link, strerror(-err)); | |
26c39028 JHS |
2773 | return -1; |
2774 | } | |
2775 | ||
2776 | netdev->ifindex = if_nametoindex(peer); | |
2777 | if (!netdev->ifindex) { | |
2778 | ERROR("failed to retrieve the ifindex for %s", peer); | |
b84f58b9 | 2779 | lxc_netdev_delete_by_name(peer); |
26c39028 JHS |
2780 | return -1; |
2781 | } | |
2782 | ||
a589434e | 2783 | DEBUG("instantiated vlan '%s', ifindex is '%d'", " vlan1000", |
e892973e DL |
2784 | netdev->ifindex); |
2785 | ||
26c39028 JHS |
2786 | return 0; |
2787 | } | |
2788 | ||
74a2b586 JK |
2789 | static int shutdown_vlan(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2790 | { | |
2791 | return 0; | |
2792 | } | |
2793 | ||
a589434e | 2794 | static int instantiate_phys(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2795 | { |
6168e99f DL |
2796 | if (!netdev->link) { |
2797 | ERROR("no link specified for the physical interface"); | |
2798 | return -1; | |
2799 | } | |
2800 | ||
9d083402 | 2801 | netdev->ifindex = if_nametoindex(netdev->link); |
82d5ae15 | 2802 | if (!netdev->ifindex) { |
9d083402 | 2803 | ERROR("failed to retrieve the index for %s", netdev->link); |
0ad19a3f | 2804 | return -1; |
2805 | } | |
2806 | ||
e3b4c4c4 ST |
2807 | if (netdev->upscript) { |
2808 | int err; | |
751d9dcd DL |
2809 | err = run_script(handler->name, "net", netdev->upscript, |
2810 | "up", "phys", netdev->link, (char*) NULL); | |
2811 | if (err) | |
e3b4c4c4 | 2812 | return -1; |
e3b4c4c4 ST |
2813 | } |
2814 | ||
82d5ae15 | 2815 | return 0; |
0ad19a3f | 2816 | } |
2817 | ||
74a2b586 JK |
2818 | static int shutdown_phys(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2819 | { | |
2820 | int err; | |
2821 | ||
2822 | if (netdev->downscript) { | |
2823 | err = run_script(handler->name, "net", netdev->downscript, | |
2824 | "down", "phys", netdev->link, (char*) NULL); | |
2825 | if (err) | |
2826 | return -1; | |
2827 | } | |
2828 | return 0; | |
2829 | } | |
2830 | ||
a589434e | 2831 | static int instantiate_none(struct lxc_handler *handler, struct lxc_netdev *netdev) |
26b797f3 SH |
2832 | { |
2833 | netdev->ifindex = 0; | |
2834 | return 0; | |
2835 | } | |
2836 | ||
a589434e | 2837 | static int instantiate_empty(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2838 | { |
82d5ae15 | 2839 | netdev->ifindex = 0; |
e3b4c4c4 ST |
2840 | if (netdev->upscript) { |
2841 | int err; | |
751d9dcd DL |
2842 | err = run_script(handler->name, "net", netdev->upscript, |
2843 | "up", "empty", (char*) NULL); | |
2844 | if (err) | |
e3b4c4c4 | 2845 | return -1; |
e3b4c4c4 | 2846 | } |
82d5ae15 | 2847 | return 0; |
0ad19a3f | 2848 | } |
2849 | ||
74a2b586 JK |
2850 | static int shutdown_empty(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2851 | { | |
2852 | int err; | |
2853 | ||
2854 | if (netdev->downscript) { | |
2855 | err = run_script(handler->name, "net", netdev->downscript, | |
2856 | "down", "empty", (char*) NULL); | |
2857 | if (err) | |
2858 | return -1; | |
2859 | } | |
2860 | return 0; | |
2861 | } | |
2862 | ||
26b797f3 SH |
2863 | static int shutdown_none(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2864 | { | |
2865 | return 0; | |
2866 | } | |
2867 | ||
2868 | int lxc_requests_empty_network(struct lxc_handler *handler) | |
2869 | { | |
2870 | struct lxc_list *network = &handler->conf->network; | |
2871 | struct lxc_list *iterator; | |
2872 | struct lxc_netdev *netdev; | |
2873 | bool found_none = false, found_nic = false; | |
2874 | ||
2875 | if (lxc_list_empty(network)) | |
2876 | return 0; | |
2877 | ||
2878 | lxc_list_for_each(iterator, network) { | |
2879 | ||
2880 | netdev = iterator->elem; | |
2881 | ||
2882 | if (netdev->type == LXC_NET_NONE) | |
2883 | found_none = true; | |
2884 | else | |
2885 | found_nic = true; | |
2886 | } | |
2887 | if (found_none && !found_nic) | |
2888 | return 1; | |
2889 | return 0; | |
2890 | } | |
2891 | ||
e3b4c4c4 | 2892 | int lxc_create_network(struct lxc_handler *handler) |
0ad19a3f | 2893 | { |
e3b4c4c4 | 2894 | struct lxc_list *network = &handler->conf->network; |
82d5ae15 | 2895 | struct lxc_list *iterator; |
82d5ae15 | 2896 | struct lxc_netdev *netdev; |
cbef6c52 SH |
2897 | int am_root = (getuid() == 0); |
2898 | ||
2899 | if (!am_root) | |
2900 | return 0; | |
0ad19a3f | 2901 | |
5f4535a3 | 2902 | lxc_list_for_each(iterator, network) { |
0ad19a3f | 2903 | |
5f4535a3 | 2904 | netdev = iterator->elem; |
13954cce | 2905 | |
24654103 | 2906 | if (netdev->type < 0 || netdev->type > LXC_NET_MAXCONFTYPE) { |
82d5ae15 | 2907 | ERROR("invalid network configuration type '%d'", |
5f4535a3 | 2908 | netdev->type); |
82d5ae15 DL |
2909 | return -1; |
2910 | } | |
0ad19a3f | 2911 | |
e3b4c4c4 | 2912 | if (netdev_conf[netdev->type](handler, netdev)) { |
82d5ae15 DL |
2913 | ERROR("failed to create netdev"); |
2914 | return -1; | |
2915 | } | |
e3b4c4c4 | 2916 | |
0ad19a3f | 2917 | } |
2918 | ||
2919 | return 0; | |
2920 | } | |
2921 | ||
74a2b586 | 2922 | void lxc_delete_network(struct lxc_handler *handler) |
7fef7a06 | 2923 | { |
74a2b586 | 2924 | struct lxc_list *network = &handler->conf->network; |
7fef7a06 DL |
2925 | struct lxc_list *iterator; |
2926 | struct lxc_netdev *netdev; | |
2927 | ||
2928 | lxc_list_for_each(iterator, network) { | |
2929 | netdev = iterator->elem; | |
d472214b | 2930 | |
74a2b586 | 2931 | if (netdev->ifindex != 0 && netdev->type == LXC_NET_PHYS) { |
d8f8e352 DL |
2932 | if (lxc_netdev_rename_by_index(netdev->ifindex, netdev->link)) |
2933 | WARN("failed to rename to the initial name the " \ | |
2934 | "netdev '%s'", netdev->link); | |
d472214b | 2935 | continue; |
d8f8e352 | 2936 | } |
d472214b | 2937 | |
74a2b586 JK |
2938 | if (netdev_deconf[netdev->type](handler, netdev)) { |
2939 | WARN("failed to destroy netdev"); | |
2940 | } | |
2941 | ||
d8f8e352 DL |
2942 | /* Recent kernel remove the virtual interfaces when the network |
2943 | * namespace is destroyed but in case we did not moved the | |
2944 | * interface to the network namespace, we have to destroy it | |
2945 | */ | |
74a2b586 JK |
2946 | if (netdev->ifindex != 0 && |
2947 | lxc_netdev_delete_by_index(netdev->ifindex)) | |
d8f8e352 | 2948 | WARN("failed to remove interface '%s'", netdev->name); |
7fef7a06 DL |
2949 | } |
2950 | } | |
2951 | ||
45e854dc SG |
2952 | #define LXC_USERNIC_PATH LIBEXECDIR "/lxc/lxc-user-nic" |
2953 | ||
fe1f672f ÇO |
2954 | /* lxc-user-nic returns "interface_name:interface_name\n" */ |
2955 | #define MAX_BUFFER_SIZE IFNAMSIZ*2 + 2 | |
74a3920a | 2956 | static int unpriv_assign_nic(struct lxc_netdev *netdev, pid_t pid) |
cbef6c52 SH |
2957 | { |
2958 | pid_t child; | |
a7242d9a ÇO |
2959 | int bytes, pipefd[2]; |
2960 | char *token, *saveptr = NULL; | |
fe1f672f | 2961 | char buffer[MAX_BUFFER_SIZE]; |
cff7b5eb | 2962 | char netdev_link[IFNAMSIZ+1]; |
cbef6c52 SH |
2963 | |
2964 | if (netdev->type != LXC_NET_VETH) { | |
2965 | ERROR("nic type %d not support for unprivileged use", | |
2966 | netdev->type); | |
2967 | return -1; | |
2968 | } | |
2969 | ||
a7242d9a ÇO |
2970 | if(pipe(pipefd) < 0) { |
2971 | SYSERROR("pipe failed"); | |
2972 | return -1; | |
2973 | } | |
2974 | ||
cbef6c52 SH |
2975 | if ((child = fork()) < 0) { |
2976 | SYSERROR("fork"); | |
a7242d9a ÇO |
2977 | close(pipefd[0]); |
2978 | close(pipefd[1]); | |
2979 | return -1; | |
2980 | } | |
2981 | ||
2982 | if (child == 0) { // child | |
2983 | /* close the read-end of the pipe */ | |
2984 | close(pipefd[0]); | |
2985 | /* redirect the stdout to write-end of the pipe */ | |
2986 | dup2(pipefd[1], STDOUT_FILENO); | |
2987 | /* close the write-end of the pipe */ | |
fe1f672f | 2988 | close(pipefd[1]); |
a7242d9a ÇO |
2989 | |
2990 | // Call lxc-user-nic pid type bridge | |
2991 | char pidstr[20]; | |
cff7b5eb FN |
2992 | if (netdev->link) { |
2993 | strncpy(netdev_link, netdev->link, IFNAMSIZ); | |
2994 | } else { | |
2995 | strncpy(netdev_link, "none", IFNAMSIZ); | |
2996 | } | |
2997 | char *args[] = {LXC_USERNIC_PATH, pidstr, "veth", netdev_link, netdev->name, NULL }; | |
a7242d9a ÇO |
2998 | snprintf(pidstr, 19, "%lu", (unsigned long) pid); |
2999 | pidstr[19] = '\0'; | |
3000 | execvp(args[0], args); | |
3001 | SYSERROR("execvp lxc-user-nic"); | |
3002 | exit(1); | |
3003 | } | |
3004 | ||
3005 | /* close the write-end of the pipe */ | |
3006 | close(pipefd[1]); | |
3007 | ||
fe1f672f | 3008 | bytes = read(pipefd[0], &buffer, MAX_BUFFER_SIZE); |
a7242d9a ÇO |
3009 | if (bytes < 0) { |
3010 | SYSERROR("read failed"); | |
3011 | } | |
3012 | buffer[bytes - 1] = '\0'; | |
3013 | ||
3014 | if (wait_for_pid(child) != 0) { | |
3015 | close(pipefd[0]); | |
cbef6c52 SH |
3016 | return -1; |
3017 | } | |
3018 | ||
a7242d9a ÇO |
3019 | /* close the read-end of the pipe */ |
3020 | close(pipefd[0]); | |
cbef6c52 | 3021 | |
a7242d9a ÇO |
3022 | /* fill netdev->name field */ |
3023 | token = strtok_r(buffer, ":", &saveptr); | |
3024 | if (!token) | |
3025 | return -1; | |
658979c5 SH |
3026 | netdev->name = malloc(IFNAMSIZ+1); |
3027 | if (!netdev->name) { | |
3028 | ERROR("Out of memory"); | |
3029 | return -1; | |
3030 | } | |
3031 | memset(netdev->name, 0, IFNAMSIZ+1); | |
3032 | strncpy(netdev->name, token, IFNAMSIZ); | |
a7242d9a ÇO |
3033 | |
3034 | /* fill netdev->veth_attr.pair field */ | |
3035 | token = strtok_r(NULL, ":", &saveptr); | |
3036 | if (!token) | |
3037 | return -1; | |
3038 | netdev->priv.veth_attr.pair = strdup(token); | |
658979c5 SH |
3039 | if (!netdev->priv.veth_attr.pair) { |
3040 | ERROR("Out of memory"); | |
3041 | return -1; | |
3042 | } | |
45e854dc | 3043 | |
a7242d9a | 3044 | return 0; |
cbef6c52 SH |
3045 | } |
3046 | ||
5f4535a3 | 3047 | int lxc_assign_network(struct lxc_list *network, pid_t pid) |
0ad19a3f | 3048 | { |
82d5ae15 | 3049 | struct lxc_list *iterator; |
82d5ae15 | 3050 | struct lxc_netdev *netdev; |
cbef6c52 | 3051 | int am_root = (getuid() == 0); |
3cfc0f3a | 3052 | int err; |
0ad19a3f | 3053 | |
5f4535a3 | 3054 | lxc_list_for_each(iterator, network) { |
82d5ae15 | 3055 | |
5f4535a3 | 3056 | netdev = iterator->elem; |
82d5ae15 | 3057 | |
fbb16259 | 3058 | if (netdev->type == LXC_NET_VETH && !am_root) { |
cbef6c52 SH |
3059 | if (unpriv_assign_nic(netdev, pid)) |
3060 | return -1; | |
658979c5 SH |
3061 | // lxc-user-nic has moved the nic to the new ns. |
3062 | // unpriv_assign_nic() fills in netdev->name. | |
3063 | // netdev->ifindex will be filed in at setup_netdev. | |
cbef6c52 SH |
3064 | continue; |
3065 | } | |
236087a6 | 3066 | |
fbb16259 SH |
3067 | /* empty network namespace, nothing to move */ |
3068 | if (!netdev->ifindex) | |
3069 | continue; | |
3070 | ||
8d357196 | 3071 | err = lxc_netdev_move_by_index(netdev->ifindex, pid, NULL); |
3cfc0f3a MN |
3072 | if (err) { |
3073 | ERROR("failed to move '%s' to the container : %s", | |
3074 | netdev->link, strerror(-err)); | |
82d5ae15 DL |
3075 | return -1; |
3076 | } | |
3077 | ||
c1c75c04 | 3078 | DEBUG("move '%s' to '%d'", netdev->name, pid); |
0ad19a3f | 3079 | } |
3080 | ||
3081 | return 0; | |
3082 | } | |
3083 | ||
251d0d2a DE |
3084 | static int write_id_mapping(enum idtype idtype, pid_t pid, const char *buf, |
3085 | size_t buf_size) | |
f6d3e3e4 SH |
3086 | { |
3087 | char path[PATH_MAX]; | |
e4ccd113 | 3088 | int ret, closeret; |
f6d3e3e4 SH |
3089 | FILE *f; |
3090 | ||
3091 | ret = snprintf(path, PATH_MAX, "/proc/%d/%cid_map", pid, idtype == ID_TYPE_UID ? 'u' : 'g'); | |
3092 | if (ret < 0 || ret >= PATH_MAX) { | |
03fadd16 | 3093 | fprintf(stderr, "%s: path name too long\n", __func__); |
f6d3e3e4 SH |
3094 | return -E2BIG; |
3095 | } | |
3096 | f = fopen(path, "w"); | |
3097 | if (!f) { | |
3098 | perror("open"); | |
3099 | return -EINVAL; | |
3100 | } | |
251d0d2a | 3101 | ret = fwrite(buf, buf_size, 1, f); |
f6d3e3e4 | 3102 | if (ret < 0) |
e4ccd113 SH |
3103 | SYSERROR("writing id mapping"); |
3104 | closeret = fclose(f); | |
3105 | if (closeret) | |
3106 | SYSERROR("writing id mapping"); | |
3107 | return ret < 0 ? ret : closeret; | |
f6d3e3e4 SH |
3108 | } |
3109 | ||
3110 | int lxc_map_ids(struct lxc_list *idmap, pid_t pid) | |
3111 | { | |
3112 | struct lxc_list *iterator; | |
3113 | struct id_map *map; | |
8afb3e61 | 3114 | int ret = 0, use_shadow = 0; |
251d0d2a | 3115 | enum idtype type; |
8afb3e61 SG |
3116 | char *buf = NULL, *pos, *cmdpath = NULL; |
3117 | ||
22038de5 SH |
3118 | /* |
3119 | * If newuidmap exists, that is, if shadow is handing out subuid | |
3120 | * ranges, then insist that root also reserve ranges in subuid. This | |
3121 | * will protected it by preventing another user from being handed the | |
3122 | * range by shadow. | |
3123 | */ | |
9d9c111c | 3124 | cmdpath = on_path("newuidmap", NULL); |
8afb3e61 SG |
3125 | if (cmdpath) { |
3126 | use_shadow = 1; | |
3127 | free(cmdpath); | |
3128 | } | |
3129 | ||
0e6e3a41 SG |
3130 | if (!use_shadow && geteuid()) { |
3131 | ERROR("Missing newuidmap/newgidmap"); | |
3132 | return -1; | |
3133 | } | |
251d0d2a DE |
3134 | |
3135 | for(type = ID_TYPE_UID; type <= ID_TYPE_GID; type++) { | |
4f7521b4 | 3136 | int left, fill; |
cf3ef16d SH |
3137 | int had_entry = 0; |
3138 | if (!buf) { | |
3139 | buf = pos = malloc(4096); | |
4f7521b4 SH |
3140 | if (!buf) |
3141 | return -ENOMEM; | |
cf3ef16d SH |
3142 | } |
3143 | pos = buf; | |
0e6e3a41 | 3144 | if (use_shadow) |
d1838f34 | 3145 | pos += sprintf(buf, "new%cidmap %d", |
cf3ef16d SH |
3146 | type == ID_TYPE_UID ? 'u' : 'g', |
3147 | pid); | |
4f7521b4 | 3148 | |
cf3ef16d SH |
3149 | lxc_list_for_each(iterator, idmap) { |
3150 | /* The kernel only takes <= 4k for writes to /proc/<nr>/[ug]id_map */ | |
251d0d2a | 3151 | map = iterator->elem; |
cf3ef16d SH |
3152 | if (map->idtype != type) |
3153 | continue; | |
3154 | ||
3155 | had_entry = 1; | |
3156 | left = 4096 - (pos - buf); | |
d1838f34 | 3157 | fill = snprintf(pos, left, "%s%lu %lu %lu%s", |
0e6e3a41 | 3158 | use_shadow ? " " : "", |
d1838f34 | 3159 | map->nsid, map->hostid, map->range, |
0e6e3a41 | 3160 | use_shadow ? "" : "\n"); |
cf3ef16d SH |
3161 | if (fill <= 0 || fill >= left) |
3162 | SYSERROR("snprintf failed, too many mappings"); | |
3163 | pos += fill; | |
251d0d2a | 3164 | } |
cf3ef16d | 3165 | if (!had_entry) |
4f7521b4 | 3166 | continue; |
cf3ef16d | 3167 | |
0e6e3a41 | 3168 | if (!use_shadow) { |
cf3ef16d | 3169 | ret = write_id_mapping(type, pid, buf, pos-buf); |
d1838f34 MS |
3170 | } else { |
3171 | left = 4096 - (pos - buf); | |
3172 | fill = snprintf(pos, left, "\n"); | |
3173 | if (fill <= 0 || fill >= left) | |
3174 | SYSERROR("snprintf failed, too many mappings"); | |
3175 | pos += fill; | |
cf3ef16d | 3176 | ret = system(buf); |
d1838f34 | 3177 | } |
cf3ef16d | 3178 | |
f6d3e3e4 SH |
3179 | if (ret) |
3180 | break; | |
3181 | } | |
251d0d2a | 3182 | |
f10fad2f | 3183 | free(buf); |
f6d3e3e4 SH |
3184 | return ret; |
3185 | } | |
3186 | ||
cf3ef16d | 3187 | /* |
7b50c609 TS |
3188 | * return the host uid/gid to which the container root is mapped in |
3189 | * *val. | |
0b3a6504 | 3190 | * Return true if id was found, false otherwise. |
cf3ef16d | 3191 | */ |
2a9a80cb | 3192 | bool get_mapped_rootid(struct lxc_conf *conf, enum idtype idtype, |
3ec1648d | 3193 | unsigned long *val) |
cf3ef16d SH |
3194 | { |
3195 | struct lxc_list *it; | |
3196 | struct id_map *map; | |
3197 | ||
3198 | lxc_list_for_each(it, &conf->id_map) { | |
3199 | map = it->elem; | |
7b50c609 | 3200 | if (map->idtype != idtype) |
cf3ef16d SH |
3201 | continue; |
3202 | if (map->nsid != 0) | |
3203 | continue; | |
2a9a80cb SH |
3204 | *val = map->hostid; |
3205 | return true; | |
cf3ef16d | 3206 | } |
2a9a80cb | 3207 | return false; |
cf3ef16d SH |
3208 | } |
3209 | ||
2133f58c | 3210 | int mapped_hostid(unsigned id, struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d SH |
3211 | { |
3212 | struct lxc_list *it; | |
3213 | struct id_map *map; | |
3214 | lxc_list_for_each(it, &conf->id_map) { | |
3215 | map = it->elem; | |
2133f58c | 3216 | if (map->idtype != idtype) |
cf3ef16d SH |
3217 | continue; |
3218 | if (id >= map->hostid && id < map->hostid + map->range) | |
57d116ab | 3219 | return (id - map->hostid) + map->nsid; |
cf3ef16d | 3220 | } |
57d116ab | 3221 | return -1; |
cf3ef16d SH |
3222 | } |
3223 | ||
2133f58c | 3224 | int find_unmapped_nsuid(struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d SH |
3225 | { |
3226 | struct lxc_list *it; | |
3227 | struct id_map *map; | |
2133f58c | 3228 | unsigned int freeid = 0; |
cf3ef16d SH |
3229 | again: |
3230 | lxc_list_for_each(it, &conf->id_map) { | |
3231 | map = it->elem; | |
2133f58c | 3232 | if (map->idtype != idtype) |
cf3ef16d SH |
3233 | continue; |
3234 | if (freeid >= map->nsid && freeid < map->nsid + map->range) { | |
3235 | freeid = map->nsid + map->range; | |
3236 | goto again; | |
3237 | } | |
3238 | } | |
3239 | return freeid; | |
3240 | } | |
3241 | ||
19a26f82 MK |
3242 | int lxc_find_gateway_addresses(struct lxc_handler *handler) |
3243 | { | |
3244 | struct lxc_list *network = &handler->conf->network; | |
3245 | struct lxc_list *iterator; | |
3246 | struct lxc_netdev *netdev; | |
3247 | int link_index; | |
3248 | ||
3249 | lxc_list_for_each(iterator, network) { | |
3250 | netdev = iterator->elem; | |
3251 | ||
3252 | if (!netdev->ipv4_gateway_auto && !netdev->ipv6_gateway_auto) | |
3253 | continue; | |
3254 | ||
3255 | if (netdev->type != LXC_NET_VETH && netdev->type != LXC_NET_MACVLAN) { | |
3256 | ERROR("gateway = auto only supported for " | |
3257 | "veth and macvlan"); | |
3258 | return -1; | |
3259 | } | |
3260 | ||
3261 | if (!netdev->link) { | |
3262 | ERROR("gateway = auto needs a link interface"); | |
3263 | return -1; | |
3264 | } | |
3265 | ||
3266 | link_index = if_nametoindex(netdev->link); | |
3267 | if (!link_index) | |
3268 | return -EINVAL; | |
3269 | ||
3270 | if (netdev->ipv4_gateway_auto) { | |
3271 | if (lxc_ipv4_addr_get(link_index, &netdev->ipv4_gateway)) { | |
3272 | ERROR("failed to automatically find ipv4 gateway " | |
3273 | "address from link interface '%s'", netdev->link); | |
3274 | return -1; | |
3275 | } | |
3276 | } | |
3277 | ||
3278 | if (netdev->ipv6_gateway_auto) { | |
3279 | if (lxc_ipv6_addr_get(link_index, &netdev->ipv6_gateway)) { | |
3280 | ERROR("failed to automatically find ipv6 gateway " | |
3281 | "address from link interface '%s'", netdev->link); | |
3282 | return -1; | |
3283 | } | |
3284 | } | |
3285 | } | |
3286 | ||
3287 | return 0; | |
3288 | } | |
3289 | ||
5e4a62bf | 3290 | int lxc_create_tty(const char *name, struct lxc_conf *conf) |
b0a33c1e | 3291 | { |
5e4a62bf | 3292 | struct lxc_tty_info *tty_info = &conf->tty_info; |
025ed0f3 | 3293 | int i, ret; |
b0a33c1e | 3294 | |
5e4a62bf DL |
3295 | /* no tty in the configuration */ |
3296 | if (!conf->tty) | |
b0a33c1e | 3297 | return 0; |
3298 | ||
13954cce | 3299 | tty_info->pty_info = |
e4e7d59d | 3300 | malloc(sizeof(*tty_info->pty_info)*conf->tty); |
b0a33c1e | 3301 | if (!tty_info->pty_info) { |
36eb9bde | 3302 | SYSERROR("failed to allocate pty_info"); |
985d15b1 | 3303 | return -1; |
b0a33c1e | 3304 | } |
3305 | ||
985d15b1 | 3306 | for (i = 0; i < conf->tty; i++) { |
13954cce | 3307 | |
b0a33c1e | 3308 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; |
3309 | ||
025ed0f3 SH |
3310 | process_lock(); |
3311 | ret = openpty(&pty_info->master, &pty_info->slave, | |
3312 | pty_info->name, NULL, NULL); | |
3313 | process_unlock(); | |
3314 | if (ret) { | |
36eb9bde | 3315 | SYSERROR("failed to create pty #%d", i); |
985d15b1 MT |
3316 | tty_info->nbtty = i; |
3317 | lxc_delete_tty(tty_info); | |
3318 | return -1; | |
b0a33c1e | 3319 | } |
3320 | ||
5332bb84 DL |
3321 | DEBUG("allocated pty '%s' (%d/%d)", |
3322 | pty_info->name, pty_info->master, pty_info->slave); | |
3323 | ||
3ec1648d | 3324 | /* Prevent leaking the file descriptors to the container */ |
b035ad62 MS |
3325 | fcntl(pty_info->master, F_SETFD, FD_CLOEXEC); |
3326 | fcntl(pty_info->slave, F_SETFD, FD_CLOEXEC); | |
3327 | ||
b0a33c1e | 3328 | pty_info->busy = 0; |
3329 | } | |
3330 | ||
985d15b1 | 3331 | tty_info->nbtty = conf->tty; |
1ac470c0 DL |
3332 | |
3333 | INFO("tty's configured"); | |
3334 | ||
985d15b1 | 3335 | return 0; |
b0a33c1e | 3336 | } |
3337 | ||
3338 | void lxc_delete_tty(struct lxc_tty_info *tty_info) | |
3339 | { | |
3340 | int i; | |
3341 | ||
3342 | for (i = 0; i < tty_info->nbtty; i++) { | |
3343 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; | |
3344 | ||
3345 | close(pty_info->master); | |
3346 | close(pty_info->slave); | |
3347 | } | |
3348 | ||
3349 | free(tty_info->pty_info); | |
3350 | tty_info->nbtty = 0; | |
3351 | } | |
3352 | ||
f6d3e3e4 | 3353 | /* |
7b50c609 TS |
3354 | * chown_mapped_root: for an unprivileged user with uid/gid X to |
3355 | * chown a dir to subuid/subgid Y, he needs to run chown as root | |
3356 | * in a userns where nsid 0 is mapped to hostuid/hostgid Y, and | |
3357 | * nsid Y is mapped to hostuid/hostgid X. That way, the container | |
3358 | * root is privileged with respect to hostuid/hostgid X, allowing | |
3359 | * him to do the chown. | |
f6d3e3e4 | 3360 | */ |
c4d10a05 | 3361 | int chown_mapped_root(char *path, struct lxc_conf *conf) |
f6d3e3e4 | 3362 | { |
7b50c609 TS |
3363 | uid_t rootuid; |
3364 | gid_t rootgid; | |
c4d10a05 | 3365 | pid_t pid; |
2a9a80cb | 3366 | unsigned long val; |
a7ef8753 | 3367 | char *chownpath = path; |
f6d3e3e4 | 3368 | |
2a9a80cb | 3369 | if (!get_mapped_rootid(conf, ID_TYPE_UID, &val)) { |
c4d10a05 SH |
3370 | ERROR("No mapping for container root"); |
3371 | return -1; | |
f6d3e3e4 | 3372 | } |
7b50c609 TS |
3373 | rootuid = (uid_t) val; |
3374 | if (!get_mapped_rootid(conf, ID_TYPE_GID, &val)) { | |
3375 | ERROR("No mapping for container root"); | |
3376 | return -1; | |
3377 | } | |
3378 | rootgid = (gid_t) val; | |
2a9a80cb | 3379 | |
a7ef8753 SH |
3380 | /* |
3381 | * In case of overlay, we want only the writeable layer | |
3382 | * to be chowned | |
3383 | */ | |
1f92162d | 3384 | if (strncmp(path, "overlayfs:", 10) == 0 || strncmp(path, "aufs:", 5) == 0) { |
a7ef8753 SH |
3385 | chownpath = strchr(path, ':'); |
3386 | if (!chownpath) { | |
3387 | ERROR("Bad overlay path: %s", path); | |
3388 | return -1; | |
3389 | } | |
3390 | chownpath = strchr(chownpath+1, ':'); | |
3391 | if (!chownpath) { | |
3392 | ERROR("Bad overlay path: %s", path); | |
3393 | return -1; | |
3394 | } | |
3395 | chownpath++; | |
3396 | } | |
3397 | path = chownpath; | |
c4d10a05 | 3398 | if (geteuid() == 0) { |
7b50c609 | 3399 | if (chown(path, rootuid, rootgid) < 0) { |
c4d10a05 SH |
3400 | ERROR("Error chowning %s", path); |
3401 | return -1; | |
3402 | } | |
3403 | return 0; | |
3404 | } | |
f3d7e4ca | 3405 | |
7b50c609 | 3406 | if (rootuid == geteuid()) { |
f3d7e4ca SH |
3407 | // nothing to do |
3408 | INFO("%s: container root is our uid; no need to chown" ,__func__); | |
3409 | return 0; | |
3410 | } | |
3411 | ||
c4d10a05 SH |
3412 | pid = fork(); |
3413 | if (pid < 0) { | |
3414 | SYSERROR("Failed forking"); | |
f6d3e3e4 SH |
3415 | return -1; |
3416 | } | |
c4d10a05 | 3417 | if (!pid) { |
7b50c609 TS |
3418 | int hostuid = geteuid(), hostgid = getegid(), ret; |
3419 | struct stat sb; | |
3420 | char map1[100], map2[100], map3[100], map4[100], map5[100]; | |
3421 | char ugid[100]; | |
3422 | char *args1[] = { "lxc-usernsexec", "-m", map1, "-m", map2, | |
3423 | "-m", map3, "-m", map5, | |
3424 | "--", "chown", ugid, path, NULL }; | |
3425 | char *args2[] = { "lxc-usernsexec", "-m", map1, "-m", map2, | |
3426 | "-m", map3, "-m", map4, "-m", map5, | |
3427 | "--", "chown", ugid, path, NULL }; | |
3428 | ||
3429 | // save the current gid of "path" | |
3430 | if (stat(path, &sb) < 0) { | |
3431 | ERROR("Error stat %s", path); | |
3432 | return -1; | |
3433 | } | |
f6d3e3e4 | 3434 | |
9a7c2aba SH |
3435 | /* |
3436 | * A file has to be group-owned by a gid mapped into the | |
3437 | * container, or the container won't be privileged over it. | |
3438 | */ | |
3439 | if (sb.st_uid == geteuid() && | |
3440 | mapped_hostid(sb.st_gid, conf, ID_TYPE_GID) < 0 && | |
3441 | chown(path, -1, hostgid) < 0) { | |
3442 | ERROR("Failed chgrping %s", path); | |
7b50c609 TS |
3443 | return -1; |
3444 | } | |
3445 | ||
3446 | // "u:0:rootuid:1" | |
3447 | ret = snprintf(map1, 100, "u:0:%d:1", rootuid); | |
c4d10a05 SH |
3448 | if (ret < 0 || ret >= 100) { |
3449 | ERROR("Error uid printing map string"); | |
f6d3e3e4 SH |
3450 | return -1; |
3451 | } | |
c4d10a05 | 3452 | |
98e5ba51 SH |
3453 | // "u:hostuid:hostuid:1" |
3454 | ret = snprintf(map2, 100, "u:%d:%d:1", hostuid, hostuid); | |
3455 | if (ret < 0 || ret >= 100) { | |
3456 | ERROR("Error uid printing map string"); | |
3457 | return -1; | |
3458 | } | |
3459 | ||
7b50c609 TS |
3460 | // "g:0:rootgid:1" |
3461 | ret = snprintf(map3, 100, "g:0:%d:1", rootgid); | |
c4d10a05 | 3462 | if (ret < 0 || ret >= 100) { |
7b50c609 | 3463 | ERROR("Error gid printing map string"); |
c4d10a05 SH |
3464 | return -1; |
3465 | } | |
3466 | ||
7b50c609 | 3467 | // "g:pathgid:rootgid+pathgid:1" |
b4c1e35d SG |
3468 | ret = snprintf(map4, 100, "g:%d:%d:1", (gid_t)sb.st_gid, |
3469 | rootgid + (gid_t)sb.st_gid); | |
7b50c609 TS |
3470 | if (ret < 0 || ret >= 100) { |
3471 | ERROR("Error gid printing map string"); | |
3472 | return -1; | |
3473 | } | |
3474 | ||
3475 | // "g:hostgid:hostgid:1" | |
3476 | ret = snprintf(map5, 100, "g:%d:%d:1", hostgid, hostgid); | |
3477 | if (ret < 0 || ret >= 100) { | |
3478 | ERROR("Error gid printing map string"); | |
3479 | return -1; | |
3480 | } | |
3481 | ||
3482 | // "0:pathgid" (chown) | |
b4c1e35d | 3483 | ret = snprintf(ugid, 100, "0:%d", (gid_t)sb.st_gid); |
7b50c609 TS |
3484 | if (ret < 0 || ret >= 100) { |
3485 | ERROR("Error owner printing format string for chown"); | |
3486 | return -1; | |
3487 | } | |
3488 | ||
3489 | if (hostgid == sb.st_gid) | |
3490 | ret = execvp("lxc-usernsexec", args1); | |
3491 | else | |
3492 | ret = execvp("lxc-usernsexec", args2); | |
c4d10a05 SH |
3493 | SYSERROR("Failed executing usernsexec"); |
3494 | exit(1); | |
f6d3e3e4 | 3495 | } |
c4d10a05 | 3496 | return wait_for_pid(pid); |
f6d3e3e4 SH |
3497 | } |
3498 | ||
c4d10a05 | 3499 | int ttys_shift_ids(struct lxc_conf *c) |
f6d3e3e4 | 3500 | { |
c4d10a05 | 3501 | if (lxc_list_empty(&c->id_map)) |
f6d3e3e4 | 3502 | return 0; |
c4d10a05 | 3503 | |
29b10e4f | 3504 | if (strcmp(c->console.name, "") !=0 && chown_mapped_root(c->console.name, c) < 0) { |
c4d10a05 SH |
3505 | ERROR("Failed to chown %s", c->console.name); |
3506 | return -1; | |
3507 | } | |
3508 | ||
f6d3e3e4 SH |
3509 | return 0; |
3510 | } | |
3511 | ||
5112cd70 SH |
3512 | int tmp_proc_mount(struct lxc_conf *lxc_conf) |
3513 | { | |
3514 | int mounted; | |
3515 | ||
01958b1f | 3516 | mounted = mount_proc_if_needed(lxc_conf->rootfs.path ? lxc_conf->rootfs.mount : ""); |
5112cd70 SH |
3517 | if (mounted == -1) { |
3518 | SYSERROR("failed to mount /proc in the container."); | |
01958b1f DW |
3519 | /* continue only if there is no rootfs */ |
3520 | if (lxc_conf->rootfs.path) | |
3521 | return -1; | |
5112cd70 SH |
3522 | } else if (mounted == 1) { |
3523 | lxc_conf->tmp_umount_proc = 1; | |
3524 | } | |
3525 | return 0; | |
3526 | } | |
3527 | ||
3528 | void tmp_proc_unmount(struct lxc_conf *lxc_conf) | |
3529 | { | |
3530 | if (lxc_conf->tmp_umount_proc == 1) { | |
3531 | umount("/proc"); | |
3532 | lxc_conf->tmp_umount_proc = 0; | |
3533 | } | |
3534 | } | |
3535 | ||
6a0c909a | 3536 | void remount_all_slave(void) |
e995d7a2 SH |
3537 | { |
3538 | /* walk /proc/mounts and change any shared entries to slave */ | |
3539 | FILE *f = fopen("/proc/self/mountinfo", "r"); | |
3540 | char *line = NULL; | |
3541 | size_t len = 0; | |
3542 | ||
3543 | if (!f) { | |
3544 | SYSERROR("Failed to open /proc/self/mountinfo to mark all shared"); | |
3545 | ERROR("Continuing container startup..."); | |
3546 | return; | |
3547 | } | |
3548 | ||
3549 | while (getline(&line, &len, f) != -1) { | |
3550 | char *target, *opts; | |
3551 | target = get_field(line, 4); | |
3552 | if (!target) | |
3553 | continue; | |
3554 | opts = get_field(target, 2); | |
3555 | if (!opts) | |
3556 | continue; | |
3557 | null_endofword(opts); | |
3558 | if (!strstr(opts, "shared")) | |
3559 | continue; | |
3560 | null_endofword(target); | |
3561 | if (mount(NULL, target, NULL, MS_SLAVE, NULL)) { | |
3562 | SYSERROR("Failed to make %s rslave", target); | |
3563 | ERROR("Continuing..."); | |
3564 | } | |
3565 | } | |
3566 | fclose(f); | |
f10fad2f | 3567 | free(line); |
e995d7a2 SH |
3568 | } |
3569 | ||
2322903b SH |
3570 | void lxc_execute_bind_init(struct lxc_conf *conf) |
3571 | { | |
3572 | int ret; | |
9d9c111c SH |
3573 | char path[PATH_MAX], destpath[PATH_MAX], *p; |
3574 | ||
3575 | /* If init exists in the container, don't bind mount a static one */ | |
3576 | p = choose_init(conf->rootfs.mount); | |
3577 | if (p) { | |
3578 | free(p); | |
3579 | return; | |
3580 | } | |
2322903b SH |
3581 | |
3582 | ret = snprintf(path, PATH_MAX, SBINDIR "/init.lxc.static"); | |
3583 | if (ret < 0 || ret >= PATH_MAX) { | |
3584 | WARN("Path name too long searching for lxc.init.static"); | |
3585 | return; | |
3586 | } | |
3587 | ||
3588 | if (!file_exists(path)) { | |
3589 | INFO("%s does not exist on host", path); | |
3590 | return; | |
3591 | } | |
3592 | ||
3593 | ret = snprintf(destpath, PATH_MAX, "%s%s", conf->rootfs.mount, "/init.lxc.static"); | |
3594 | if (ret < 0 || ret >= PATH_MAX) { | |
3595 | WARN("Path name too long for container's lxc.init.static"); | |
3596 | return; | |
3597 | } | |
3598 | ||
3599 | if (!file_exists(destpath)) { | |
3600 | FILE * pathfile = fopen(destpath, "wb"); | |
3601 | if (!pathfile) { | |
3602 | SYSERROR("Failed to create mount target '%s'", destpath); | |
3603 | return; | |
3604 | } | |
3605 | fclose(pathfile); | |
3606 | } | |
3607 | ||
592fd47a | 3608 | ret = safe_mount(path, destpath, "none", MS_BIND, NULL, conf->rootfs.mount); |
2322903b SH |
3609 | if (ret < 0) |
3610 | SYSERROR("Failed to bind lxc.init.static into container"); | |
3611 | INFO("lxc.init.static bound into container at %s", path); | |
3612 | } | |
3613 | ||
35120d9c SH |
3614 | /* |
3615 | * This does the work of remounting / if it is shared, calling the | |
3616 | * container pre-mount hooks, and mounting the rootfs. | |
3617 | */ | |
3618 | int do_rootfs_setup(struct lxc_conf *conf, const char *name, const char *lxcpath) | |
0ad19a3f | 3619 | { |
35120d9c SH |
3620 | if (conf->rootfs_setup) { |
3621 | /* | |
3622 | * rootfs was set up in another namespace. bind-mount it | |
3623 | * to give us a mount in our own ns so we can pivot_root to it | |
3624 | */ | |
3625 | const char *path = conf->rootfs.mount; | |
3626 | if (mount(path, path, "rootfs", MS_BIND, NULL) < 0) { | |
3627 | ERROR("Failed to bind-mount container / onto itself"); | |
145832ba | 3628 | return -1; |
35120d9c | 3629 | } |
145832ba | 3630 | return 0; |
35120d9c | 3631 | } |
d4ef7c50 | 3632 | |
e995d7a2 SH |
3633 | remount_all_slave(); |
3634 | ||
35120d9c SH |
3635 | if (run_lxc_hooks(name, "pre-mount", conf, lxcpath, NULL)) { |
3636 | ERROR("failed to run pre-mount hooks for container '%s'.", name); | |
3637 | return -1; | |
3638 | } | |
3639 | ||
3640 | if (setup_rootfs(conf)) { | |
3641 | ERROR("failed to setup rootfs for '%s'", name); | |
3642 | return -1; | |
3643 | } | |
3644 | ||
3645 | conf->rootfs_setup = true; | |
3646 | return 0; | |
3647 | } | |
3648 | ||
1c1c7051 SH |
3649 | static bool verify_start_hooks(struct lxc_conf *conf) |
3650 | { | |
3651 | struct lxc_list *it; | |
3652 | char path[MAXPATHLEN]; | |
3653 | lxc_list_for_each(it, &conf->hooks[LXCHOOK_START]) { | |
3654 | char *hookname = it->elem; | |
3655 | struct stat st; | |
3656 | int ret; | |
3657 | ||
3658 | ret = snprintf(path, MAXPATHLEN, "%s%s", | |
7b6753e7 | 3659 | conf->rootfs.path ? conf->rootfs.mount : "", hookname); |
1c1c7051 SH |
3660 | if (ret < 0 || ret >= MAXPATHLEN) |
3661 | return false; | |
3662 | ret = stat(path, &st); | |
3663 | if (ret) { | |
7b6753e7 | 3664 | SYSERROR("Start hook %s not found in container", |
1c1c7051 SH |
3665 | hookname); |
3666 | return false; | |
3667 | } | |
6a0c909a | 3668 | return true; |
1c1c7051 SH |
3669 | } |
3670 | ||
3671 | return true; | |
3672 | } | |
3673 | ||
e8bd4e43 SH |
3674 | static int send_fd(int sock, int fd) |
3675 | { | |
3676 | int ret = lxc_abstract_unix_send_fd(sock, fd, NULL, 0); | |
3677 | ||
3678 | ||
3679 | if (ret < 0) { | |
3680 | SYSERROR("Error sending tty fd to parent"); | |
3681 | return -1; | |
3682 | } | |
3683 | ||
3684 | return 0; | |
3685 | } | |
3686 | ||
3687 | static int send_ttys_to_parent(struct lxc_handler *handler) | |
3688 | { | |
3689 | struct lxc_conf *conf = handler->conf; | |
3690 | const struct lxc_tty_info *tty_info = &conf->tty_info; | |
3691 | int i; | |
3692 | int sock = handler->ttysock[0]; | |
3693 | ||
3694 | for (i = 0; i < tty_info->nbtty; i++) { | |
3695 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; | |
3696 | if (send_fd(sock, pty_info->slave) < 0) | |
3697 | goto bad; | |
3698 | close(pty_info->slave); | |
3699 | pty_info->slave = -1; | |
3700 | if (send_fd(sock, pty_info->master) < 0) | |
3701 | goto bad; | |
3702 | close(pty_info->master); | |
3703 | pty_info->master = -1; | |
3704 | } | |
3705 | ||
3706 | close(handler->ttysock[0]); | |
3707 | close(handler->ttysock[1]); | |
3708 | ||
3709 | return 0; | |
3710 | ||
3711 | bad: | |
3712 | ERROR("Error writing tty fd to parent"); | |
3713 | return -1; | |
3714 | } | |
3715 | ||
35120d9c SH |
3716 | int lxc_setup(struct lxc_handler *handler) |
3717 | { | |
3718 | const char *name = handler->name; | |
3719 | struct lxc_conf *lxc_conf = handler->conf; | |
3720 | const char *lxcpath = handler->lxcpath; | |
35120d9c SH |
3721 | |
3722 | if (do_rootfs_setup(lxc_conf, name, lxcpath) < 0) { | |
3723 | ERROR("Error setting up rootfs mount after spawn"); | |
3724 | return -1; | |
3725 | } | |
3726 | ||
6c544cb3 MM |
3727 | if (lxc_conf->inherit_ns_fd[LXC_NS_UTS] == -1) { |
3728 | if (setup_utsname(lxc_conf->utsname)) { | |
3729 | ERROR("failed to setup the utsname for '%s'", name); | |
3730 | return -1; | |
3731 | } | |
0ad19a3f | 3732 | } |
3733 | ||
5f4535a3 | 3734 | if (setup_network(&lxc_conf->network)) { |
36eb9bde | 3735 | ERROR("failed to setup the network for '%s'", name); |
95b5ffaf | 3736 | return -1; |
0ad19a3f | 3737 | } |
3738 | ||
bc6928ff | 3739 | if (lxc_conf->autodev > 0) { |
14221cbb | 3740 | if (mount_autodev(name, &lxc_conf->rootfs, lxcpath)) { |
91c3830e | 3741 | ERROR("failed to mount /dev in the container"); |
c6883f38 SH |
3742 | return -1; |
3743 | } | |
3744 | } | |
3745 | ||
368bbc02 CS |
3746 | /* do automatic mounts (mainly /proc and /sys), but exclude |
3747 | * those that need to wait until other stuff has finished | |
3748 | */ | |
4fb3cba5 | 3749 | if (lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & ~LXC_AUTO_CGROUP_MASK, handler) < 0) { |
368bbc02 CS |
3750 | ERROR("failed to setup the automatic mounts for '%s'", name); |
3751 | return -1; | |
3752 | } | |
3753 | ||
80a881b2 | 3754 | if (setup_mount(&lxc_conf->rootfs, lxc_conf->fstab, name)) { |
36eb9bde | 3755 | ERROR("failed to setup the mounts for '%s'", name); |
95b5ffaf | 3756 | return -1; |
576f946d | 3757 | } |
3758 | ||
c1dc38c2 | 3759 | if (!lxc_list_empty(&lxc_conf->mount_list) && setup_mount_entries(&lxc_conf->rootfs, &lxc_conf->mount_list, name)) { |
e7938e9e MN |
3760 | ERROR("failed to setup the mount entries for '%s'", name); |
3761 | return -1; | |
3762 | } | |
3763 | ||
7b6753e7 | 3764 | /* Make sure any start hooks are in the container */ |
1c1c7051 SH |
3765 | if (!verify_start_hooks(lxc_conf)) |
3766 | return -1; | |
3767 | ||
2322903b SH |
3768 | if (lxc_conf->is_execute) |
3769 | lxc_execute_bind_init(lxc_conf); | |
3770 | ||
368bbc02 CS |
3771 | /* now mount only cgroup, if wanted; |
3772 | * before, /sys could not have been mounted | |
3773 | * (is either mounted automatically or via fstab entries) | |
3774 | */ | |
4fb3cba5 | 3775 | if (lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & LXC_AUTO_CGROUP_MASK, handler) < 0) { |
368bbc02 CS |
3776 | ERROR("failed to setup the automatic mounts for '%s'", name); |
3777 | return -1; | |
3778 | } | |
3779 | ||
283678ed | 3780 | if (run_lxc_hooks(name, "mount", lxc_conf, lxcpath, NULL)) { |
773fb9ca SH |
3781 | ERROR("failed to run mount hooks for container '%s'.", name); |
3782 | return -1; | |
3783 | } | |
3784 | ||
bc6928ff | 3785 | if (lxc_conf->autodev > 0) { |
283678ed | 3786 | if (run_lxc_hooks(name, "autodev", lxc_conf, lxcpath, NULL)) { |
f7bee6c6 MW |
3787 | ERROR("failed to run autodev hooks for container '%s'.", name); |
3788 | return -1; | |
3789 | } | |
14221cbb | 3790 | if (fill_autodev(&lxc_conf->rootfs)) { |
91c3830e SH |
3791 | ERROR("failed to populate /dev in the container"); |
3792 | return -1; | |
3793 | } | |
3794 | } | |
368bbc02 | 3795 | |
37903589 | 3796 | if (!lxc_conf->is_execute && setup_console(&lxc_conf->rootfs, &lxc_conf->console, lxc_conf->ttydir)) { |
36eb9bde | 3797 | ERROR("failed to setup the console for '%s'", name); |
95b5ffaf | 3798 | return -1; |
6e590161 | 3799 | } |
3800 | ||
7e0e1d94 AV |
3801 | if (lxc_conf->kmsg) { |
3802 | if (setup_kmsg(&lxc_conf->rootfs, &lxc_conf->console)) // don't fail | |
3803 | ERROR("failed to setup kmsg for '%s'", name); | |
3804 | } | |
1bd051a6 | 3805 | |
69aa6655 DE |
3806 | if (!lxc_conf->is_execute && setup_dev_symlinks(&lxc_conf->rootfs)) { |
3807 | ERROR("failed to setup /dev symlinks for '%s'", name); | |
3808 | return -1; | |
3809 | } | |
3810 | ||
5112cd70 SH |
3811 | /* mount /proc if it's not already there */ |
3812 | if (tmp_proc_mount(lxc_conf) < 0) { | |
fe4de9a6 | 3813 | ERROR("failed to LSM mount proc for '%s'", name); |
e075f5d9 | 3814 | return -1; |
e075f5d9 | 3815 | } |
e075f5d9 | 3816 | |
ac778708 | 3817 | if (setup_pivot_root(&lxc_conf->rootfs)) { |
36eb9bde | 3818 | ERROR("failed to set rootfs for '%s'", name); |
95b5ffaf | 3819 | return -1; |
ed502555 | 3820 | } |
3821 | ||
571e6ec8 | 3822 | if (setup_pts(lxc_conf->pts)) { |
36eb9bde | 3823 | ERROR("failed to setup the new pts instance"); |
95b5ffaf | 3824 | return -1; |
3c26f34e | 3825 | } |
3826 | ||
e8bd4e43 SH |
3827 | if (lxc_create_tty(name, lxc_conf)) { |
3828 | ERROR("failed to create the ttys"); | |
3829 | return -1; | |
3830 | } | |
3831 | ||
3832 | if (send_ttys_to_parent(handler) < 0) { | |
3833 | ERROR("failure sending console info to parent"); | |
3834 | return -1; | |
3835 | } | |
3836 | ||
3837 | ||
3838 | if (!lxc_conf->is_execute && setup_tty(lxc_conf)) { | |
3839 | ERROR("failed to setup the ttys for '%s'", name); | |
3840 | return -1; | |
3841 | } | |
3842 | ||
3843 | if (lxc_conf->pty_names && setenv("container_ttys", lxc_conf->pty_names, 1)) | |
3844 | SYSERROR("failed to set environment variable for container ptys"); | |
3845 | ||
3846 | ||
cccc74b5 DL |
3847 | if (setup_personality(lxc_conf->personality)) { |
3848 | ERROR("failed to setup personality"); | |
3849 | return -1; | |
3850 | } | |
3851 | ||
97a8f74f SG |
3852 | if (!lxc_list_empty(&lxc_conf->keepcaps)) { |
3853 | if (!lxc_list_empty(&lxc_conf->caps)) { | |
3854 | ERROR("Simultaneously requested dropping and keeping caps"); | |
f6d3e3e4 SH |
3855 | return -1; |
3856 | } | |
97a8f74f SG |
3857 | if (dropcaps_except(&lxc_conf->keepcaps)) { |
3858 | ERROR("failed to keep requested caps"); | |
3859 | return -1; | |
3860 | } | |
3861 | } else if (setup_caps(&lxc_conf->caps)) { | |
3862 | ERROR("failed to drop capabilities"); | |
3863 | return -1; | |
81810dd1 DL |
3864 | } |
3865 | ||
cd54d859 DL |
3866 | NOTICE("'%s' is setup.", name); |
3867 | ||
0ad19a3f | 3868 | return 0; |
3869 | } | |
26ddeedd | 3870 | |
283678ed SH |
3871 | int run_lxc_hooks(const char *name, char *hook, struct lxc_conf *conf, |
3872 | const char *lxcpath, char *argv[]) | |
26ddeedd SH |
3873 | { |
3874 | int which = -1; | |
3875 | struct lxc_list *it; | |
3876 | ||
3877 | if (strcmp(hook, "pre-start") == 0) | |
3878 | which = LXCHOOK_PRESTART; | |
5ea6163a SH |
3879 | else if (strcmp(hook, "pre-mount") == 0) |
3880 | which = LXCHOOK_PREMOUNT; | |
26ddeedd SH |
3881 | else if (strcmp(hook, "mount") == 0) |
3882 | which = LXCHOOK_MOUNT; | |
f7bee6c6 MW |
3883 | else if (strcmp(hook, "autodev") == 0) |
3884 | which = LXCHOOK_AUTODEV; | |
26ddeedd SH |
3885 | else if (strcmp(hook, "start") == 0) |
3886 | which = LXCHOOK_START; | |
3887 | else if (strcmp(hook, "post-stop") == 0) | |
3888 | which = LXCHOOK_POSTSTOP; | |
148e91f5 SH |
3889 | else if (strcmp(hook, "clone") == 0) |
3890 | which = LXCHOOK_CLONE; | |
37cf711b SY |
3891 | else if (strcmp(hook, "destroy") == 0) |
3892 | which = LXCHOOK_DESTROY; | |
26ddeedd SH |
3893 | else |
3894 | return -1; | |
3895 | lxc_list_for_each(it, &conf->hooks[which]) { | |
3896 | int ret; | |
3897 | char *hookname = it->elem; | |
283678ed | 3898 | ret = run_script_argv(name, "lxc", hookname, hook, lxcpath, argv); |
26ddeedd SH |
3899 | if (ret) |
3900 | return ret; | |
3901 | } | |
3902 | return 0; | |
3903 | } | |
72d0e1cb | 3904 | |
427b3a21 | 3905 | static void lxc_remove_nic(struct lxc_list *it) |
72d0e1cb SG |
3906 | { |
3907 | struct lxc_netdev *netdev = it->elem; | |
9ebb03ad | 3908 | struct lxc_list *it2,*next; |
72d0e1cb SG |
3909 | |
3910 | lxc_list_del(it); | |
3911 | ||
f10fad2f ME |
3912 | free(netdev->link); |
3913 | free(netdev->name); | |
3914 | if (netdev->type == LXC_NET_VETH) | |
c9bb9a85 | 3915 | free(netdev->priv.veth_attr.pair); |
f10fad2f ME |
3916 | free(netdev->upscript); |
3917 | free(netdev->hwaddr); | |
3918 | free(netdev->mtu); | |
3919 | free(netdev->ipv4_gateway); | |
3920 | free(netdev->ipv6_gateway); | |
9ebb03ad | 3921 | lxc_list_for_each_safe(it2, &netdev->ipv4, next) { |
72d0e1cb SG |
3922 | lxc_list_del(it2); |
3923 | free(it2->elem); | |
3924 | free(it2); | |
3925 | } | |
9ebb03ad | 3926 | lxc_list_for_each_safe(it2, &netdev->ipv6, next) { |
72d0e1cb SG |
3927 | lxc_list_del(it2); |
3928 | free(it2->elem); | |
3929 | free(it2); | |
3930 | } | |
d95db067 | 3931 | free(netdev); |
72d0e1cb SG |
3932 | free(it); |
3933 | } | |
3934 | ||
3935 | /* we get passed in something like '0', '0.ipv4' or '1.ipv6' */ | |
12a50cc6 | 3936 | int lxc_clear_nic(struct lxc_conf *c, const char *key) |
72d0e1cb SG |
3937 | { |
3938 | char *p1; | |
3939 | int ret, idx, i; | |
3940 | struct lxc_list *it; | |
3941 | struct lxc_netdev *netdev; | |
3942 | ||
46cd2845 | 3943 | p1 = strchr(key, '.'); |
72d0e1cb SG |
3944 | if (!p1 || *(p1+1) == '\0') |
3945 | p1 = NULL; | |
3946 | ||
3947 | ret = sscanf(key, "%d", &idx); | |
3948 | if (ret != 1) return -1; | |
3949 | if (idx < 0) | |
3950 | return -1; | |
3951 | ||
3952 | i = 0; | |
3953 | lxc_list_for_each(it, &c->network) { | |
3954 | if (i == idx) | |
3955 | break; | |
3956 | i++; | |
3957 | } | |
3958 | if (i < idx) // we don't have that many nics defined | |
3959 | return -1; | |
3960 | ||
3961 | if (!it || !it->elem) | |
3962 | return -1; | |
3963 | ||
3964 | netdev = it->elem; | |
3965 | ||
3966 | if (!p1) { | |
3967 | lxc_remove_nic(it); | |
52d21d40 | 3968 | } else if (strcmp(p1, ".ipv4") == 0) { |
9ebb03ad DE |
3969 | struct lxc_list *it2,*next; |
3970 | lxc_list_for_each_safe(it2, &netdev->ipv4, next) { | |
72d0e1cb SG |
3971 | lxc_list_del(it2); |
3972 | free(it2->elem); | |
3973 | free(it2); | |
3974 | } | |
52d21d40 | 3975 | } else if (strcmp(p1, ".ipv6") == 0) { |
9ebb03ad DE |
3976 | struct lxc_list *it2,*next; |
3977 | lxc_list_for_each_safe(it2, &netdev->ipv6, next) { | |
72d0e1cb SG |
3978 | lxc_list_del(it2); |
3979 | free(it2->elem); | |
3980 | free(it2); | |
3981 | } | |
72d0e1cb SG |
3982 | } |
3983 | else return -1; | |
3984 | ||
3985 | return 0; | |
3986 | } | |
3987 | ||
3988 | int lxc_clear_config_network(struct lxc_conf *c) | |
3989 | { | |
9ebb03ad DE |
3990 | struct lxc_list *it,*next; |
3991 | lxc_list_for_each_safe(it, &c->network, next) { | |
72d0e1cb SG |
3992 | lxc_remove_nic(it); |
3993 | } | |
3994 | return 0; | |
3995 | } | |
3996 | ||
3997 | int lxc_clear_config_caps(struct lxc_conf *c) | |
3998 | { | |
9ebb03ad | 3999 | struct lxc_list *it,*next; |
72d0e1cb | 4000 | |
9ebb03ad | 4001 | lxc_list_for_each_safe(it, &c->caps, next) { |
72d0e1cb SG |
4002 | lxc_list_del(it); |
4003 | free(it->elem); | |
4004 | free(it); | |
4005 | } | |
4006 | return 0; | |
4007 | } | |
4008 | ||
74a3920a | 4009 | static int lxc_free_idmap(struct lxc_list *id_map) { |
27c27d73 SH |
4010 | struct lxc_list *it, *next; |
4011 | ||
4355ab5f | 4012 | lxc_list_for_each_safe(it, id_map, next) { |
27c27d73 SH |
4013 | lxc_list_del(it); |
4014 | free(it->elem); | |
4015 | free(it); | |
4016 | } | |
4017 | return 0; | |
4018 | } | |
4019 | ||
4355ab5f SH |
4020 | int lxc_clear_idmaps(struct lxc_conf *c) |
4021 | { | |
4022 | return lxc_free_idmap(&c->id_map); | |
4023 | } | |
4024 | ||
1fb86a7c SH |
4025 | int lxc_clear_config_keepcaps(struct lxc_conf *c) |
4026 | { | |
4027 | struct lxc_list *it,*next; | |
4028 | ||
4029 | lxc_list_for_each_safe(it, &c->keepcaps, next) { | |
4030 | lxc_list_del(it); | |
4031 | free(it->elem); | |
4032 | free(it); | |
4033 | } | |
4034 | return 0; | |
4035 | } | |
4036 | ||
12a50cc6 | 4037 | int lxc_clear_cgroups(struct lxc_conf *c, const char *key) |
72d0e1cb | 4038 | { |
9ebb03ad | 4039 | struct lxc_list *it,*next; |
72d0e1cb | 4040 | bool all = false; |
12a50cc6 | 4041 | const char *k = key + 11; |
72d0e1cb SG |
4042 | |
4043 | if (strcmp(key, "lxc.cgroup") == 0) | |
4044 | all = true; | |
4045 | ||
9ebb03ad | 4046 | lxc_list_for_each_safe(it, &c->cgroup, next) { |
72d0e1cb SG |
4047 | struct lxc_cgroup *cg = it->elem; |
4048 | if (!all && strcmp(cg->subsystem, k) != 0) | |
4049 | continue; | |
4050 | lxc_list_del(it); | |
4051 | free(cg->subsystem); | |
4052 | free(cg->value); | |
4053 | free(cg); | |
4054 | free(it); | |
4055 | } | |
4056 | return 0; | |
4057 | } | |
4058 | ||
ee1e7aa0 SG |
4059 | int lxc_clear_groups(struct lxc_conf *c) |
4060 | { | |
4061 | struct lxc_list *it,*next; | |
4062 | ||
4063 | lxc_list_for_each_safe(it, &c->groups, next) { | |
4064 | lxc_list_del(it); | |
4065 | free(it->elem); | |
4066 | free(it); | |
4067 | } | |
4068 | return 0; | |
4069 | } | |
4070 | ||
ab799c0b SG |
4071 | int lxc_clear_environment(struct lxc_conf *c) |
4072 | { | |
4073 | struct lxc_list *it,*next; | |
4074 | ||
4075 | lxc_list_for_each_safe(it, &c->environment, next) { | |
4076 | lxc_list_del(it); | |
4077 | free(it->elem); | |
4078 | free(it); | |
4079 | } | |
4080 | return 0; | |
4081 | } | |
4082 | ||
4083 | ||
72d0e1cb SG |
4084 | int lxc_clear_mount_entries(struct lxc_conf *c) |
4085 | { | |
9ebb03ad | 4086 | struct lxc_list *it,*next; |
72d0e1cb | 4087 | |
9ebb03ad | 4088 | lxc_list_for_each_safe(it, &c->mount_list, next) { |
72d0e1cb SG |
4089 | lxc_list_del(it); |
4090 | free(it->elem); | |
4091 | free(it); | |
4092 | } | |
4093 | return 0; | |
4094 | } | |
4095 | ||
b099e9e9 SH |
4096 | int lxc_clear_automounts(struct lxc_conf *c) |
4097 | { | |
4098 | c->auto_mounts = 0; | |
4099 | return 0; | |
4100 | } | |
4101 | ||
12a50cc6 | 4102 | int lxc_clear_hooks(struct lxc_conf *c, const char *key) |
72d0e1cb | 4103 | { |
9ebb03ad | 4104 | struct lxc_list *it,*next; |
17ed13a3 | 4105 | bool all = false, done = false; |
12a50cc6 | 4106 | const char *k = key + 9; |
72d0e1cb SG |
4107 | int i; |
4108 | ||
17ed13a3 SH |
4109 | if (strcmp(key, "lxc.hook") == 0) |
4110 | all = true; | |
4111 | ||
72d0e1cb | 4112 | for (i=0; i<NUM_LXC_HOOKS; i++) { |
17ed13a3 | 4113 | if (all || strcmp(k, lxchook_names[i]) == 0) { |
9ebb03ad | 4114 | lxc_list_for_each_safe(it, &c->hooks[i], next) { |
17ed13a3 SH |
4115 | lxc_list_del(it); |
4116 | free(it->elem); | |
4117 | free(it); | |
4118 | } | |
4119 | done = true; | |
72d0e1cb SG |
4120 | } |
4121 | } | |
17ed13a3 SH |
4122 | |
4123 | if (!done) { | |
4124 | ERROR("Invalid hook key: %s", key); | |
4125 | return -1; | |
4126 | } | |
72d0e1cb SG |
4127 | return 0; |
4128 | } | |
8eb5694b | 4129 | |
74a3920a | 4130 | static void lxc_clear_saved_nics(struct lxc_conf *conf) |
7b35f3d6 SH |
4131 | { |
4132 | int i; | |
4133 | ||
0cf45501 | 4134 | if (!conf->saved_nics) |
7b35f3d6 SH |
4135 | return; |
4136 | for (i=0; i < conf->num_savednics; i++) | |
4137 | free(conf->saved_nics[i].orig_name); | |
7b35f3d6 SH |
4138 | free(conf->saved_nics); |
4139 | } | |
4140 | ||
4184c3e1 SH |
4141 | static inline void lxc_clear_aliens(struct lxc_conf *conf) |
4142 | { | |
4143 | struct lxc_list *it,*next; | |
4144 | ||
4145 | lxc_list_for_each_safe(it, &conf->aliens, next) { | |
4146 | lxc_list_del(it); | |
4147 | free(it->elem); | |
4148 | free(it); | |
4149 | } | |
4150 | } | |
4151 | ||
f979ac15 SH |
4152 | static inline void lxc_clear_includes(struct lxc_conf *conf) |
4153 | { | |
4154 | struct lxc_list *it,*next; | |
4155 | ||
4156 | lxc_list_for_each_safe(it, &conf->includes, next) { | |
4157 | lxc_list_del(it); | |
4158 | free(it->elem); | |
4159 | free(it); | |
4160 | } | |
4161 | } | |
4162 | ||
8eb5694b SH |
4163 | void lxc_conf_free(struct lxc_conf *conf) |
4164 | { | |
4165 | if (!conf) | |
4166 | return; | |
858377e4 SH |
4167 | if (current_config == conf) |
4168 | current_config = NULL; | |
f10fad2f ME |
4169 | free(conf->console.log_path); |
4170 | free(conf->console.path); | |
4171 | free(conf->rootfs.mount); | |
4172 | free(conf->rootfs.options); | |
4173 | free(conf->rootfs.path); | |
4174 | free(conf->rootfs.pivot); | |
4175 | free(conf->logfile); | |
858377e4 SH |
4176 | if (conf->logfd != -1) |
4177 | close(conf->logfd); | |
f10fad2f ME |
4178 | free(conf->utsname); |
4179 | free(conf->ttydir); | |
4180 | free(conf->fstab); | |
4181 | free(conf->rcfile); | |
4182 | free(conf->init_cmd); | |
6b0d5538 | 4183 | free(conf->unexpanded_config); |
393903d1 | 4184 | free(conf->pty_names); |
8eb5694b | 4185 | lxc_clear_config_network(conf); |
f10fad2f ME |
4186 | free(conf->lsm_aa_profile); |
4187 | free(conf->lsm_se_context); | |
769872f9 | 4188 | lxc_seccomp_free(conf); |
8eb5694b | 4189 | lxc_clear_config_caps(conf); |
1fb86a7c | 4190 | lxc_clear_config_keepcaps(conf); |
8eb5694b | 4191 | lxc_clear_cgroups(conf, "lxc.cgroup"); |
17ed13a3 | 4192 | lxc_clear_hooks(conf, "lxc.hook"); |
8eb5694b | 4193 | lxc_clear_mount_entries(conf); |
7b35f3d6 | 4194 | lxc_clear_saved_nics(conf); |
27c27d73 | 4195 | lxc_clear_idmaps(conf); |
ee1e7aa0 | 4196 | lxc_clear_groups(conf); |
f979ac15 | 4197 | lxc_clear_includes(conf); |
761d81ca | 4198 | lxc_clear_aliens(conf); |
ab799c0b | 4199 | lxc_clear_environment(conf); |
8eb5694b SH |
4200 | free(conf); |
4201 | } | |
4355ab5f SH |
4202 | |
4203 | struct userns_fn_data { | |
4204 | int (*fn)(void *); | |
4205 | void *arg; | |
4206 | int p[2]; | |
4207 | }; | |
4208 | ||
4209 | static int run_userns_fn(void *data) | |
4210 | { | |
4211 | struct userns_fn_data *d = data; | |
4212 | char c; | |
4213 | // we're not sharing with the parent any more, if it was a thread | |
4214 | ||
4215 | close(d->p[1]); | |
4216 | if (read(d->p[0], &c, 1) != 1) | |
4217 | return -1; | |
4218 | close(d->p[0]); | |
4219 | return d->fn(d->arg); | |
4220 | } | |
4221 | ||
4222 | /* | |
8b227008 TS |
4223 | * Add ID_TYPE_UID/ID_TYPE_GID entries to an existing lxc_conf, |
4224 | * if they are not already there. | |
4355ab5f | 4225 | */ |
8b227008 TS |
4226 | static struct lxc_list *idmap_add_id(struct lxc_conf *conf, |
4227 | uid_t uid, gid_t gid) | |
4355ab5f | 4228 | { |
8b227008 TS |
4229 | int hostuid_mapped = mapped_hostid(uid, conf, ID_TYPE_UID); |
4230 | int hostgid_mapped = mapped_hostid(gid, conf, ID_TYPE_GID); | |
4355ab5f SH |
4231 | struct lxc_list *new = NULL, *tmp, *it, *next; |
4232 | struct id_map *entry; | |
4233 | ||
3ec1648d SH |
4234 | new = malloc(sizeof(*new)); |
4235 | if (!new) { | |
4236 | ERROR("Out of memory building id map"); | |
4237 | return NULL; | |
4238 | } | |
4239 | lxc_list_init(new); | |
4240 | ||
8b227008 TS |
4241 | if (hostuid_mapped < 0) { |
4242 | hostuid_mapped = find_unmapped_nsuid(conf, ID_TYPE_UID); | |
4243 | if (hostuid_mapped < 0) | |
3ec1648d SH |
4244 | goto err; |
4245 | tmp = malloc(sizeof(*tmp)); | |
4246 | if (!tmp) | |
4247 | goto err; | |
4355ab5f SH |
4248 | entry = malloc(sizeof(*entry)); |
4249 | if (!entry) { | |
3ec1648d SH |
4250 | free(tmp); |
4251 | goto err; | |
4355ab5f | 4252 | } |
3ec1648d | 4253 | tmp->elem = entry; |
4355ab5f | 4254 | entry->idtype = ID_TYPE_UID; |
8b227008 TS |
4255 | entry->nsid = hostuid_mapped; |
4256 | entry->hostid = (unsigned long) uid; | |
4257 | entry->range = 1; | |
4258 | lxc_list_add_tail(new, tmp); | |
4259 | } | |
4260 | if (hostgid_mapped < 0) { | |
4261 | hostgid_mapped = find_unmapped_nsuid(conf, ID_TYPE_GID); | |
4262 | if (hostgid_mapped < 0) | |
4263 | goto err; | |
4264 | tmp = malloc(sizeof(*tmp)); | |
4265 | if (!tmp) | |
4266 | goto err; | |
4267 | entry = malloc(sizeof(*entry)); | |
4268 | if (!entry) { | |
4269 | free(tmp); | |
4270 | goto err; | |
4271 | } | |
4272 | tmp->elem = entry; | |
4273 | entry->idtype = ID_TYPE_GID; | |
4274 | entry->nsid = hostgid_mapped; | |
4275 | entry->hostid = (unsigned long) gid; | |
4355ab5f | 4276 | entry->range = 1; |
3ec1648d | 4277 | lxc_list_add_tail(new, tmp); |
4355ab5f SH |
4278 | } |
4279 | lxc_list_for_each_safe(it, &conf->id_map, next) { | |
4280 | tmp = malloc(sizeof(*tmp)); | |
4281 | if (!tmp) | |
4282 | goto err; | |
4283 | entry = malloc(sizeof(*entry)); | |
4284 | if (!entry) { | |
4285 | free(tmp); | |
4286 | goto err; | |
4287 | } | |
4288 | memset(entry, 0, sizeof(*entry)); | |
4289 | memcpy(entry, it->elem, sizeof(*entry)); | |
4290 | tmp->elem = entry; | |
3ec1648d | 4291 | lxc_list_add_tail(new, tmp); |
4355ab5f SH |
4292 | } |
4293 | ||
4294 | return new; | |
4295 | ||
4296 | err: | |
8b227008 | 4297 | ERROR("Out of memory building a new uid/gid map"); |
908fde6a SH |
4298 | if (new) |
4299 | lxc_free_idmap(new); | |
c30ac545 | 4300 | free(new); |
4355ab5f SH |
4301 | return NULL; |
4302 | } | |
4303 | ||
4304 | /* | |
4305 | * Run a function in a new user namespace. | |
8b227008 | 4306 | * The caller's euid/egid will be mapped in if it is not already. |
4355ab5f SH |
4307 | */ |
4308 | int userns_exec_1(struct lxc_conf *conf, int (*fn)(void *), void *data) | |
4309 | { | |
4310 | int ret, pid; | |
4311 | struct userns_fn_data d; | |
4312 | char c = '1'; | |
4313 | int p[2]; | |
4314 | struct lxc_list *idmap; | |
4315 | ||
4355ab5f | 4316 | ret = pipe(p); |
4355ab5f SH |
4317 | if (ret < 0) { |
4318 | SYSERROR("opening pipe"); | |
4319 | return -1; | |
4320 | } | |
4321 | d.fn = fn; | |
4322 | d.arg = data; | |
4323 | d.p[0] = p[0]; | |
4324 | d.p[1] = p[1]; | |
4325 | pid = lxc_clone(run_userns_fn, &d, CLONE_NEWUSER); | |
4326 | if (pid < 0) | |
4327 | goto err; | |
4355ab5f | 4328 | close(p[0]); |
4355ab5f SH |
4329 | p[0] = -1; |
4330 | ||
8b227008 TS |
4331 | if ((idmap = idmap_add_id(conf, geteuid(), getegid())) == NULL) { |
4332 | ERROR("Error adding self to container uid/gid map"); | |
4355ab5f SH |
4333 | goto err; |
4334 | } | |
4335 | ||
4336 | ret = lxc_map_ids(idmap, pid); | |
4337 | lxc_free_idmap(idmap); | |
88dd66fc | 4338 | free(idmap); |
565e571c | 4339 | if (ret) { |
4355ab5f SH |
4340 | ERROR("Error setting up child mappings"); |
4341 | goto err; | |
4342 | } | |
4343 | ||
4344 | // kick the child | |
4345 | if (write(p[1], &c, 1) != 1) { | |
4346 | SYSERROR("writing to pipe to child"); | |
4347 | goto err; | |
4348 | } | |
4349 | ||
3139aead SG |
4350 | ret = wait_for_pid(pid); |
4351 | ||
4352 | close(p[1]); | |
4353 | return ret; | |
4354 | ||
4355ab5f | 4355 | err: |
4355ab5f SH |
4356 | if (p[0] != -1) |
4357 | close(p[0]); | |
4358 | close(p[1]); | |
4355ab5f SH |
4359 | return -1; |
4360 | } | |
97e9cfa0 | 4361 | |
a96a8e8c | 4362 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4363 | static char* getuname(void) |
4364 | { | |
a96a8e8c | 4365 | struct passwd *result; |
97e9cfa0 | 4366 | |
a96a8e8c SH |
4367 | result = getpwuid(geteuid()); |
4368 | if (!result) | |
97e9cfa0 SH |
4369 | return NULL; |
4370 | ||
a96a8e8c | 4371 | return strdup(result->pw_name); |
97e9cfa0 SH |
4372 | } |
4373 | ||
a96a8e8c | 4374 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4375 | static char *getgname(void) |
4376 | { | |
a96a8e8c | 4377 | struct group *result; |
97e9cfa0 | 4378 | |
a96a8e8c SH |
4379 | result = getgrgid(getegid()); |
4380 | if (!result) | |
97e9cfa0 SH |
4381 | return NULL; |
4382 | ||
a96a8e8c | 4383 | return strdup(result->gr_name); |
97e9cfa0 SH |
4384 | } |
4385 | ||
a96a8e8c | 4386 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4387 | void suggest_default_idmap(void) |
4388 | { | |
4389 | FILE *f; | |
4390 | unsigned int uid = 0, urange = 0, gid = 0, grange = 0; | |
4391 | char *line = NULL; | |
4392 | char *uname, *gname; | |
4393 | size_t len = 0; | |
4394 | ||
4395 | if (!(uname = getuname())) | |
4396 | return; | |
4397 | ||
4398 | if (!(gname = getgname())) { | |
4399 | free(uname); | |
4400 | return; | |
4401 | } | |
4402 | ||
4403 | f = fopen(subuidfile, "r"); | |
4404 | if (!f) { | |
4405 | ERROR("Your system is not configured with subuids"); | |
4406 | free(gname); | |
4407 | free(uname); | |
4408 | return; | |
4409 | } | |
4410 | while (getline(&line, &len, f) != -1) { | |
4411 | char *p = strchr(line, ':'), *p2; | |
4412 | if (*line == '#') | |
4413 | continue; | |
4414 | if (!p) | |
4415 | continue; | |
4416 | *p = '\0'; | |
4417 | p++; | |
4418 | if (strcmp(line, uname)) | |
4419 | continue; | |
4420 | p2 = strchr(p, ':'); | |
4421 | if (!p2) | |
4422 | continue; | |
4423 | *p2 = '\0'; | |
4424 | p2++; | |
4425 | if (!*p2) | |
4426 | continue; | |
4427 | uid = atoi(p); | |
4428 | urange = atoi(p2); | |
4429 | } | |
4430 | fclose(f); | |
4431 | ||
4432 | f = fopen(subuidfile, "r"); | |
4433 | if (!f) { | |
4434 | ERROR("Your system is not configured with subgids"); | |
4435 | free(gname); | |
4436 | free(uname); | |
4437 | return; | |
4438 | } | |
4439 | while (getline(&line, &len, f) != -1) { | |
4440 | char *p = strchr(line, ':'), *p2; | |
4441 | if (*line == '#') | |
4442 | continue; | |
4443 | if (!p) | |
4444 | continue; | |
4445 | *p = '\0'; | |
4446 | p++; | |
4447 | if (strcmp(line, uname)) | |
4448 | continue; | |
4449 | p2 = strchr(p, ':'); | |
4450 | if (!p2) | |
4451 | continue; | |
4452 | *p2 = '\0'; | |
4453 | p2++; | |
4454 | if (!*p2) | |
4455 | continue; | |
4456 | gid = atoi(p); | |
4457 | grange = atoi(p2); | |
4458 | } | |
4459 | fclose(f); | |
4460 | ||
f10fad2f | 4461 | free(line); |
97e9cfa0 SH |
4462 | |
4463 | if (!urange || !grange) { | |
4464 | ERROR("You do not have subuids or subgids allocated"); | |
4465 | ERROR("Unprivileged containers require subuids and subgids"); | |
4466 | return; | |
4467 | } | |
4468 | ||
4469 | ERROR("You must either run as root, or define uid mappings"); | |
4470 | ERROR("To pass uid mappings to lxc-create, you could create"); | |
4471 | ERROR("~/.config/lxc/default.conf:"); | |
4472 | ERROR("lxc.include = %s", LXC_DEFAULT_CONFIG); | |
4473 | ERROR("lxc.id_map = u 0 %u %u", uid, urange); | |
4474 | ERROR("lxc.id_map = g 0 %u %u", gid, grange); | |
4475 | ||
4476 | free(gname); | |
4477 | free(uname); | |
4478 | } | |
aaf26830 | 4479 | |
a7307747 SH |
4480 | static void free_cgroup_settings(struct lxc_list *result) |
4481 | { | |
4482 | struct lxc_list *iterator, *next; | |
4483 | ||
4484 | lxc_list_for_each_safe(iterator, result, next) { | |
4485 | lxc_list_del(iterator); | |
4486 | free(iterator); | |
4487 | } | |
4488 | free(result); | |
4489 | } | |
4490 | ||
aaf26830 KT |
4491 | /* |
4492 | * Return the list of cgroup_settings sorted according to the following rules | |
4493 | * 1. Put memory.limit_in_bytes before memory.memsw.limit_in_bytes | |
4494 | */ | |
4495 | struct lxc_list *sort_cgroup_settings(struct lxc_list* cgroup_settings) | |
4496 | { | |
4497 | struct lxc_list *result; | |
4498 | struct lxc_list *memsw_limit = NULL; | |
4499 | struct lxc_list *it = NULL; | |
4500 | struct lxc_cgroup *cg = NULL; | |
4501 | struct lxc_list *item = NULL; | |
4502 | ||
4503 | result = malloc(sizeof(*result)); | |
fac7c663 KT |
4504 | if (!result) { |
4505 | ERROR("failed to allocate memory to sort cgroup settings"); | |
4506 | return NULL; | |
4507 | } | |
aaf26830 KT |
4508 | lxc_list_init(result); |
4509 | ||
4510 | /*Iterate over the cgroup settings and copy them to the output list*/ | |
4511 | lxc_list_for_each(it, cgroup_settings) { | |
4512 | item = malloc(sizeof(*item)); | |
fac7c663 KT |
4513 | if (!item) { |
4514 | ERROR("failed to allocate memory to sort cgroup settings"); | |
a7307747 | 4515 | free_cgroup_settings(result); |
fac7c663 KT |
4516 | return NULL; |
4517 | } | |
aaf26830 KT |
4518 | item->elem = it->elem; |
4519 | cg = it->elem; | |
4520 | if (strcmp(cg->subsystem, "memory.memsw.limit_in_bytes") == 0) { | |
4521 | /* Store the memsw_limit location */ | |
4522 | memsw_limit = item; | |
4523 | } else if (strcmp(cg->subsystem, "memory.limit_in_bytes") == 0 && memsw_limit != NULL) { | |
4d5b72a1 | 4524 | /* lxc.cgroup.memory.memsw.limit_in_bytes is found before |
aaf26830 KT |
4525 | * lxc.cgroup.memory.limit_in_bytes, swap these two items */ |
4526 | item->elem = memsw_limit->elem; | |
4527 | memsw_limit->elem = it->elem; | |
4528 | } | |
4529 | lxc_list_add_tail(result, item); | |
4530 | } | |
4531 | ||
4532 | return result; | |
a7307747 | 4533 | } |