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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" | |
b2718c72 | 68 | #include "parse.h" |
1b09f2c0 DL |
69 | #include "utils.h" |
70 | #include "conf.h" | |
71 | #include "log.h" | |
d55bc1ad | 72 | #include "caps.h" /* for lxc_caps_last_cap() */ |
9be53773 | 73 | #include "bdev.h" |
368bbc02 | 74 | #include "cgroup.h" |
025ed0f3 | 75 | #include "lxclock.h" |
4355ab5f | 76 | #include "namespace.h" |
fe4de9a6 | 77 | #include "lsm/lsm.h" |
d0a36f2c | 78 | |
495d2046 SG |
79 | #if HAVE_SYS_CAPABILITY_H |
80 | #include <sys/capability.h> | |
81 | #endif | |
82 | ||
6ff05e18 SG |
83 | #if HAVE_SYS_PERSONALITY_H |
84 | #include <sys/personality.h> | |
85 | #endif | |
86 | ||
edaf8b1b SG |
87 | #if IS_BIONIC |
88 | #include <../include/lxcmntent.h> | |
89 | #else | |
90 | #include <mntent.h> | |
91 | #endif | |
92 | ||
769872f9 SH |
93 | #include "lxcseccomp.h" |
94 | ||
36eb9bde | 95 | lxc_log_define(lxc_conf, lxc); |
e5bda9ee | 96 | |
87da4ec3 | 97 | #define LINELEN 4096 |
0ad19a3f | 98 | |
495d2046 | 99 | #if HAVE_SYS_CAPABILITY_H |
b09094da MN |
100 | #ifndef CAP_SETFCAP |
101 | #define CAP_SETFCAP 31 | |
102 | #endif | |
103 | ||
104 | #ifndef CAP_MAC_OVERRIDE | |
105 | #define CAP_MAC_OVERRIDE 32 | |
106 | #endif | |
107 | ||
108 | #ifndef CAP_MAC_ADMIN | |
109 | #define CAP_MAC_ADMIN 33 | |
110 | #endif | |
495d2046 | 111 | #endif |
b09094da MN |
112 | |
113 | #ifndef PR_CAPBSET_DROP | |
114 | #define PR_CAPBSET_DROP 24 | |
115 | #endif | |
116 | ||
9818cae4 SG |
117 | #ifndef LO_FLAGS_AUTOCLEAR |
118 | #define LO_FLAGS_AUTOCLEAR 4 | |
119 | #endif | |
120 | ||
0769b82a CS |
121 | /* needed for cgroup automount checks, regardless of whether we |
122 | * have included linux/capability.h or not */ | |
123 | #ifndef CAP_SYS_ADMIN | |
124 | #define CAP_SYS_ADMIN 21 | |
125 | #endif | |
126 | ||
2d76d1d7 SG |
127 | /* Define pivot_root() if missing from the C library */ |
128 | #ifndef HAVE_PIVOT_ROOT | |
129 | static int pivot_root(const char * new_root, const char * put_old) | |
130 | { | |
131 | #ifdef __NR_pivot_root | |
132 | return syscall(__NR_pivot_root, new_root, put_old); | |
133 | #else | |
134 | errno = ENOSYS; | |
135 | return -1; | |
136 | #endif | |
137 | } | |
138 | #else | |
139 | extern int pivot_root(const char * new_root, const char * put_old); | |
140 | #endif | |
141 | ||
142 | /* Define sethostname() if missing from the C library */ | |
143 | #ifndef HAVE_SETHOSTNAME | |
144 | static int sethostname(const char * name, size_t len) | |
145 | { | |
146 | #ifdef __NR_sethostname | |
147 | return syscall(__NR_sethostname, name, len); | |
148 | #else | |
149 | errno = ENOSYS; | |
150 | return -1; | |
151 | #endif | |
152 | } | |
153 | #endif | |
154 | ||
72f919c4 SG |
155 | /* Define __S_ISTYPE if missing from the C library */ |
156 | #ifndef __S_ISTYPE | |
157 | #define __S_ISTYPE(mode, mask) (((mode) & S_IFMT) == (mask)) | |
158 | #endif | |
159 | ||
ecec0126 SG |
160 | #ifndef MS_PRIVATE |
161 | #define MS_PRIVATE (1<<18) | |
162 | #endif | |
163 | ||
72d0e1cb | 164 | char *lxchook_names[NUM_LXC_HOOKS] = { |
148e91f5 | 165 | "pre-start", "pre-mount", "mount", "autodev", "start", "post-stop", "clone" }; |
72d0e1cb | 166 | |
a589434e | 167 | typedef int (*instantiate_cb)(struct lxc_handler *, struct lxc_netdev *); |
0ad19a3f | 168 | |
998ac676 RT |
169 | struct mount_opt { |
170 | char *name; | |
171 | int clear; | |
172 | int flag; | |
173 | }; | |
174 | ||
81810dd1 DL |
175 | struct caps_opt { |
176 | char *name; | |
177 | int value; | |
178 | }; | |
179 | ||
0769b82a CS |
180 | /* Declare this here, since we don't want to reshuffle the whole file. */ |
181 | static int in_caplist(int cap, struct lxc_list *caps); | |
182 | ||
a589434e JN |
183 | static int instantiate_veth(struct lxc_handler *, struct lxc_netdev *); |
184 | static int instantiate_macvlan(struct lxc_handler *, struct lxc_netdev *); | |
185 | static int instantiate_vlan(struct lxc_handler *, struct lxc_netdev *); | |
186 | static int instantiate_phys(struct lxc_handler *, struct lxc_netdev *); | |
187 | static int instantiate_empty(struct lxc_handler *, struct lxc_netdev *); | |
188 | static int instantiate_none(struct lxc_handler *, struct lxc_netdev *); | |
189 | ||
190 | static instantiate_cb netdev_conf[LXC_NET_MAXCONFTYPE + 1] = { | |
191 | [LXC_NET_VETH] = instantiate_veth, | |
192 | [LXC_NET_MACVLAN] = instantiate_macvlan, | |
193 | [LXC_NET_VLAN] = instantiate_vlan, | |
194 | [LXC_NET_PHYS] = instantiate_phys, | |
195 | [LXC_NET_EMPTY] = instantiate_empty, | |
196 | [LXC_NET_NONE] = instantiate_none, | |
0ad19a3f | 197 | }; |
198 | ||
74a2b586 JK |
199 | static int shutdown_veth(struct lxc_handler *, struct lxc_netdev *); |
200 | static int shutdown_macvlan(struct lxc_handler *, struct lxc_netdev *); | |
201 | static int shutdown_vlan(struct lxc_handler *, struct lxc_netdev *); | |
202 | static int shutdown_phys(struct lxc_handler *, struct lxc_netdev *); | |
203 | static int shutdown_empty(struct lxc_handler *, struct lxc_netdev *); | |
26b797f3 | 204 | static int shutdown_none(struct lxc_handler *, struct lxc_netdev *); |
74a2b586 | 205 | |
a589434e | 206 | static instantiate_cb netdev_deconf[LXC_NET_MAXCONFTYPE + 1] = { |
74a2b586 JK |
207 | [LXC_NET_VETH] = shutdown_veth, |
208 | [LXC_NET_MACVLAN] = shutdown_macvlan, | |
209 | [LXC_NET_VLAN] = shutdown_vlan, | |
210 | [LXC_NET_PHYS] = shutdown_phys, | |
211 | [LXC_NET_EMPTY] = shutdown_empty, | |
26b797f3 | 212 | [LXC_NET_NONE] = shutdown_none, |
74a2b586 JK |
213 | }; |
214 | ||
998ac676 | 215 | static struct mount_opt mount_opt[] = { |
88d413d5 SW |
216 | { "defaults", 0, 0 }, |
217 | { "ro", 0, MS_RDONLY }, | |
218 | { "rw", 1, MS_RDONLY }, | |
219 | { "suid", 1, MS_NOSUID }, | |
220 | { "nosuid", 0, MS_NOSUID }, | |
221 | { "dev", 1, MS_NODEV }, | |
222 | { "nodev", 0, MS_NODEV }, | |
223 | { "exec", 1, MS_NOEXEC }, | |
224 | { "noexec", 0, MS_NOEXEC }, | |
225 | { "sync", 0, MS_SYNCHRONOUS }, | |
226 | { "async", 1, MS_SYNCHRONOUS }, | |
227 | { "dirsync", 0, MS_DIRSYNC }, | |
228 | { "remount", 0, MS_REMOUNT }, | |
229 | { "mand", 0, MS_MANDLOCK }, | |
230 | { "nomand", 1, MS_MANDLOCK }, | |
231 | { "atime", 1, MS_NOATIME }, | |
232 | { "noatime", 0, MS_NOATIME }, | |
233 | { "diratime", 1, MS_NODIRATIME }, | |
234 | { "nodiratime", 0, MS_NODIRATIME }, | |
235 | { "bind", 0, MS_BIND }, | |
236 | { "rbind", 0, MS_BIND|MS_REC }, | |
237 | { "relatime", 0, MS_RELATIME }, | |
238 | { "norelatime", 1, MS_RELATIME }, | |
239 | { "strictatime", 0, MS_STRICTATIME }, | |
240 | { "nostrictatime", 1, MS_STRICTATIME }, | |
241 | { NULL, 0, 0 }, | |
998ac676 RT |
242 | }; |
243 | ||
495d2046 | 244 | #if HAVE_SYS_CAPABILITY_H |
81810dd1 | 245 | static struct caps_opt caps_opt[] = { |
a6afdde9 | 246 | { "chown", CAP_CHOWN }, |
1e11be34 DL |
247 | { "dac_override", CAP_DAC_OVERRIDE }, |
248 | { "dac_read_search", CAP_DAC_READ_SEARCH }, | |
249 | { "fowner", CAP_FOWNER }, | |
250 | { "fsetid", CAP_FSETID }, | |
81810dd1 DL |
251 | { "kill", CAP_KILL }, |
252 | { "setgid", CAP_SETGID }, | |
253 | { "setuid", CAP_SETUID }, | |
254 | { "setpcap", CAP_SETPCAP }, | |
255 | { "linux_immutable", CAP_LINUX_IMMUTABLE }, | |
256 | { "net_bind_service", CAP_NET_BIND_SERVICE }, | |
257 | { "net_broadcast", CAP_NET_BROADCAST }, | |
258 | { "net_admin", CAP_NET_ADMIN }, | |
259 | { "net_raw", CAP_NET_RAW }, | |
260 | { "ipc_lock", CAP_IPC_LOCK }, | |
261 | { "ipc_owner", CAP_IPC_OWNER }, | |
262 | { "sys_module", CAP_SYS_MODULE }, | |
263 | { "sys_rawio", CAP_SYS_RAWIO }, | |
264 | { "sys_chroot", CAP_SYS_CHROOT }, | |
265 | { "sys_ptrace", CAP_SYS_PTRACE }, | |
266 | { "sys_pacct", CAP_SYS_PACCT }, | |
267 | { "sys_admin", CAP_SYS_ADMIN }, | |
268 | { "sys_boot", CAP_SYS_BOOT }, | |
269 | { "sys_nice", CAP_SYS_NICE }, | |
270 | { "sys_resource", CAP_SYS_RESOURCE }, | |
271 | { "sys_time", CAP_SYS_TIME }, | |
272 | { "sys_tty_config", CAP_SYS_TTY_CONFIG }, | |
273 | { "mknod", CAP_MKNOD }, | |
274 | { "lease", CAP_LEASE }, | |
9527e566 | 275 | #ifdef CAP_AUDIT_WRITE |
81810dd1 | 276 | { "audit_write", CAP_AUDIT_WRITE }, |
9527e566 FW |
277 | #endif |
278 | #ifdef CAP_AUDIT_CONTROL | |
81810dd1 | 279 | { "audit_control", CAP_AUDIT_CONTROL }, |
9527e566 | 280 | #endif |
81810dd1 DL |
281 | { "setfcap", CAP_SETFCAP }, |
282 | { "mac_override", CAP_MAC_OVERRIDE }, | |
283 | { "mac_admin", CAP_MAC_ADMIN }, | |
5170c716 CS |
284 | #ifdef CAP_SYSLOG |
285 | { "syslog", CAP_SYSLOG }, | |
286 | #endif | |
287 | #ifdef CAP_WAKE_ALARM | |
288 | { "wake_alarm", CAP_WAKE_ALARM }, | |
289 | #endif | |
81810dd1 | 290 | }; |
495d2046 SG |
291 | #else |
292 | static struct caps_opt caps_opt[] = {}; | |
293 | #endif | |
81810dd1 | 294 | |
91c3830e SH |
295 | static int run_buffer(char *buffer) |
296 | { | |
ebec9176 | 297 | struct lxc_popen_FILE *f; |
91c3830e | 298 | char *output; |
8e7da691 | 299 | int ret; |
91c3830e | 300 | |
ebec9176 | 301 | f = lxc_popen(buffer); |
91c3830e SH |
302 | if (!f) { |
303 | SYSERROR("popen failed"); | |
304 | return -1; | |
305 | } | |
306 | ||
307 | output = malloc(LXC_LOG_BUFFER_SIZE); | |
308 | if (!output) { | |
309 | ERROR("failed to allocate memory for script output"); | |
ebec9176 | 310 | lxc_pclose(f); |
91c3830e SH |
311 | return -1; |
312 | } | |
313 | ||
ebec9176 | 314 | while(fgets(output, LXC_LOG_BUFFER_SIZE, f->f)) |
91c3830e SH |
315 | DEBUG("script output: %s", output); |
316 | ||
317 | free(output); | |
318 | ||
ebec9176 | 319 | ret = lxc_pclose(f); |
8e7da691 | 320 | if (ret == -1) { |
91c3830e SH |
321 | SYSERROR("Script exited on error"); |
322 | return -1; | |
8e7da691 DE |
323 | } else if (WIFEXITED(ret) && WEXITSTATUS(ret) != 0) { |
324 | ERROR("Script exited with status %d", WEXITSTATUS(ret)); | |
325 | return -1; | |
326 | } else if (WIFSIGNALED(ret)) { | |
327 | ERROR("Script terminated by signal %d (%s)", WTERMSIG(ret), | |
328 | strsignal(WTERMSIG(ret))); | |
329 | return -1; | |
91c3830e SH |
330 | } |
331 | ||
332 | return 0; | |
333 | } | |
334 | ||
148e91f5 | 335 | static int run_script_argv(const char *name, const char *section, |
283678ed SH |
336 | const char *script, const char *hook, const char *lxcpath, |
337 | char **argsin) | |
148e91f5 SH |
338 | { |
339 | int ret, i; | |
340 | char *buffer; | |
341 | size_t size = 0; | |
342 | ||
343 | INFO("Executing script '%s' for container '%s', config section '%s'", | |
344 | script, name, section); | |
345 | ||
346 | for (i=0; argsin && argsin[i]; i++) | |
347 | size += strlen(argsin[i]) + 1; | |
348 | ||
349 | size += strlen(hook) + 1; | |
350 | ||
351 | size += strlen(script); | |
352 | size += strlen(name); | |
353 | size += strlen(section); | |
354 | size += 3; | |
355 | ||
356 | if (size > INT_MAX) | |
357 | return -1; | |
358 | ||
359 | buffer = alloca(size); | |
360 | if (!buffer) { | |
361 | ERROR("failed to allocate memory"); | |
362 | return -1; | |
363 | } | |
364 | ||
365 | ret = snprintf(buffer, size, "%s %s %s %s", script, name, section, hook); | |
366 | if (ret < 0 || ret >= size) { | |
367 | ERROR("Script name too long"); | |
368 | return -1; | |
369 | } | |
370 | ||
371 | for (i=0; argsin && argsin[i]; i++) { | |
372 | int len = size-ret; | |
373 | int rc; | |
374 | rc = snprintf(buffer + ret, len, " %s", argsin[i]); | |
375 | if (rc < 0 || rc >= len) { | |
376 | ERROR("Script args too long"); | |
377 | return -1; | |
378 | } | |
379 | ret += rc; | |
380 | } | |
381 | ||
382 | return run_buffer(buffer); | |
383 | } | |
384 | ||
751d9dcd DL |
385 | static int run_script(const char *name, const char *section, |
386 | const char *script, ...) | |
e3b4c4c4 | 387 | { |
abbfd20b | 388 | int ret; |
91c3830e | 389 | char *buffer, *p; |
abbfd20b DL |
390 | size_t size = 0; |
391 | va_list ap; | |
751d9dcd DL |
392 | |
393 | INFO("Executing script '%s' for container '%s', config section '%s'", | |
394 | script, name, section); | |
e3b4c4c4 | 395 | |
abbfd20b DL |
396 | va_start(ap, script); |
397 | while ((p = va_arg(ap, char *))) | |
95642a10 | 398 | size += strlen(p) + 1; |
abbfd20b DL |
399 | va_end(ap); |
400 | ||
401 | size += strlen(script); | |
402 | size += strlen(name); | |
403 | size += strlen(section); | |
95642a10 | 404 | size += 3; |
abbfd20b | 405 | |
95642a10 MS |
406 | if (size > INT_MAX) |
407 | return -1; | |
408 | ||
409 | buffer = alloca(size); | |
abbfd20b DL |
410 | if (!buffer) { |
411 | ERROR("failed to allocate memory"); | |
751d9dcd DL |
412 | return -1; |
413 | } | |
414 | ||
9ba8130c SH |
415 | ret = snprintf(buffer, size, "%s %s %s", script, name, section); |
416 | if (ret < 0 || ret >= size) { | |
417 | ERROR("Script name too long"); | |
9ba8130c SH |
418 | return -1; |
419 | } | |
751d9dcd | 420 | |
abbfd20b | 421 | va_start(ap, script); |
9ba8130c SH |
422 | while ((p = va_arg(ap, char *))) { |
423 | int len = size-ret; | |
424 | int rc; | |
425 | rc = snprintf(buffer + ret, len, " %s", p); | |
426 | if (rc < 0 || rc >= len) { | |
9ba8130c SH |
427 | ERROR("Script args too long"); |
428 | return -1; | |
429 | } | |
430 | ret += rc; | |
431 | } | |
abbfd20b | 432 | va_end(ap); |
751d9dcd | 433 | |
91c3830e | 434 | return run_buffer(buffer); |
e3b4c4c4 ST |
435 | } |
436 | ||
a6afdde9 | 437 | static int find_fstype_cb(char* buffer, void *data) |
78ae2fcc | 438 | { |
439 | struct cbarg { | |
440 | const char *rootfs; | |
a6afdde9 | 441 | const char *target; |
a17b1e65 | 442 | const char *options; |
78ae2fcc | 443 | } *cbarg = data; |
444 | ||
a17b1e65 SG |
445 | unsigned long mntflags; |
446 | char *mntdata; | |
78ae2fcc | 447 | char *fstype; |
448 | ||
449 | /* we don't try 'nodev' entries */ | |
450 | if (strstr(buffer, "nodev")) | |
451 | return 0; | |
452 | ||
453 | fstype = buffer; | |
b2718c72 | 454 | fstype += lxc_char_left_gc(fstype, strlen(fstype)); |
455 | fstype[lxc_char_right_gc(fstype, strlen(fstype))] = '\0'; | |
78ae2fcc | 456 | |
9827ecdb YK |
457 | /* ignore blank line and comment */ |
458 | if (fstype[0] == '\0' || fstype[0] == '#') | |
459 | return 0; | |
460 | ||
a6afdde9 DL |
461 | DEBUG("trying to mount '%s'->'%s' with fstype '%s'", |
462 | cbarg->rootfs, cbarg->target, fstype); | |
463 | ||
a17b1e65 SG |
464 | if (parse_mntopts(cbarg->options, &mntflags, &mntdata) < 0) { |
465 | free(mntdata); | |
466 | return -1; | |
467 | } | |
468 | ||
469 | if (mount(cbarg->rootfs, cbarg->target, fstype, mntflags, mntdata)) { | |
a6afdde9 | 470 | DEBUG("mount failed with error: %s", strerror(errno)); |
a17b1e65 | 471 | free(mntdata); |
78ae2fcc | 472 | return 0; |
a6afdde9 | 473 | } |
a17b1e65 | 474 | free(mntdata); |
78ae2fcc | 475 | |
a6afdde9 DL |
476 | INFO("mounted '%s' on '%s', with fstype '%s'", |
477 | cbarg->rootfs, cbarg->target, fstype); | |
78ae2fcc | 478 | |
479 | return 1; | |
480 | } | |
481 | ||
a17b1e65 SG |
482 | static int mount_unknown_fs(const char *rootfs, const char *target, |
483 | const char *options) | |
78ae2fcc | 484 | { |
a6afdde9 | 485 | int i; |
78ae2fcc | 486 | |
487 | struct cbarg { | |
488 | const char *rootfs; | |
a6afdde9 | 489 | const char *target; |
a17b1e65 | 490 | const char *options; |
78ae2fcc | 491 | } cbarg = { |
492 | .rootfs = rootfs, | |
a6afdde9 | 493 | .target = target, |
a17b1e65 | 494 | .options = options, |
78ae2fcc | 495 | }; |
496 | ||
a6afdde9 DL |
497 | /* |
498 | * find the filesystem type with brute force: | |
499 | * first we check with /etc/filesystems, in case the modules | |
78ae2fcc | 500 | * are auto-loaded and fall back to the supported kernel fs |
501 | */ | |
502 | char *fsfile[] = { | |
503 | "/etc/filesystems", | |
504 | "/proc/filesystems", | |
505 | }; | |
506 | ||
a6afdde9 DL |
507 | for (i = 0; i < sizeof(fsfile)/sizeof(fsfile[0]); i++) { |
508 | ||
509 | int ret; | |
510 | ||
511 | if (access(fsfile[i], F_OK)) | |
512 | continue; | |
513 | ||
514 | ret = lxc_file_for_each_line(fsfile[i], find_fstype_cb, &cbarg); | |
515 | if (ret < 0) { | |
516 | ERROR("failed to parse '%s'", fsfile[i]); | |
517 | return -1; | |
518 | } | |
519 | ||
520 | if (ret) | |
521 | return 0; | |
78ae2fcc | 522 | } |
523 | ||
a6afdde9 DL |
524 | ERROR("failed to determine fs type for '%s'", rootfs); |
525 | return -1; | |
526 | } | |
527 | ||
a17b1e65 SG |
528 | static int mount_rootfs_dir(const char *rootfs, const char *target, |
529 | const char *options) | |
a6afdde9 | 530 | { |
a17b1e65 SG |
531 | unsigned long mntflags; |
532 | char *mntdata; | |
533 | int ret; | |
534 | ||
535 | if (parse_mntopts(options, &mntflags, &mntdata) < 0) { | |
536 | free(mntdata); | |
537 | return -1; | |
538 | } | |
539 | ||
540 | ret = mount(rootfs, target, "none", MS_BIND | MS_REC | mntflags, mntdata); | |
541 | free(mntdata); | |
542 | ||
543 | return ret; | |
a6afdde9 DL |
544 | } |
545 | ||
546 | static int setup_lodev(const char *rootfs, int fd, struct loop_info64 *loinfo) | |
547 | { | |
548 | int rfd; | |
549 | int ret = -1; | |
550 | ||
551 | rfd = open(rootfs, O_RDWR); | |
552 | if (rfd < 0) { | |
553 | SYSERROR("failed to open '%s'", rootfs); | |
78ae2fcc | 554 | return -1; |
555 | } | |
556 | ||
a6afdde9 | 557 | memset(loinfo, 0, sizeof(*loinfo)); |
78ae2fcc | 558 | |
a6afdde9 | 559 | loinfo->lo_flags = LO_FLAGS_AUTOCLEAR; |
78ae2fcc | 560 | |
a6afdde9 DL |
561 | if (ioctl(fd, LOOP_SET_FD, rfd)) { |
562 | SYSERROR("failed to LOOP_SET_FD"); | |
563 | goto out; | |
78ae2fcc | 564 | } |
565 | ||
a6afdde9 DL |
566 | if (ioctl(fd, LOOP_SET_STATUS64, loinfo)) { |
567 | SYSERROR("failed to LOOP_SET_STATUS64"); | |
78ae2fcc | 568 | goto out; |
569 | } | |
570 | ||
a6afdde9 | 571 | ret = 0; |
78ae2fcc | 572 | out: |
a6afdde9 | 573 | close(rfd); |
78ae2fcc | 574 | |
a6afdde9 | 575 | return ret; |
78ae2fcc | 576 | } |
577 | ||
a17b1e65 SG |
578 | static int mount_rootfs_file(const char *rootfs, const char *target, |
579 | const char *options) | |
78ae2fcc | 580 | { |
a6afdde9 DL |
581 | struct dirent dirent, *direntp; |
582 | struct loop_info64 loinfo; | |
9ba8130c | 583 | int ret = -1, fd = -1, rc; |
a6afdde9 DL |
584 | DIR *dir; |
585 | char path[MAXPATHLEN]; | |
78ae2fcc | 586 | |
a6afdde9 DL |
587 | dir = opendir("/dev"); |
588 | if (!dir) { | |
589 | SYSERROR("failed to open '/dev'"); | |
78ae2fcc | 590 | return -1; |
591 | } | |
592 | ||
a6afdde9 DL |
593 | while (!readdir_r(dir, &dirent, &direntp)) { |
594 | ||
595 | if (!direntp) | |
596 | break; | |
597 | ||
598 | if (!strcmp(direntp->d_name, ".")) | |
599 | continue; | |
600 | ||
601 | if (!strcmp(direntp->d_name, "..")) | |
602 | continue; | |
603 | ||
604 | if (strncmp(direntp->d_name, "loop", 4)) | |
605 | continue; | |
606 | ||
9ba8130c SH |
607 | rc = snprintf(path, MAXPATHLEN, "/dev/%s", direntp->d_name); |
608 | if (rc < 0 || rc >= MAXPATHLEN) | |
609 | continue; | |
610 | ||
a6afdde9 DL |
611 | fd = open(path, O_RDWR); |
612 | if (fd < 0) | |
613 | continue; | |
614 | ||
615 | if (ioctl(fd, LOOP_GET_STATUS64, &loinfo) == 0) { | |
616 | close(fd); | |
617 | continue; | |
618 | } | |
619 | ||
620 | if (errno != ENXIO) { | |
621 | WARN("unexpected error for ioctl on '%s': %m", | |
622 | direntp->d_name); | |
00b6be44 | 623 | close(fd); |
a6afdde9 DL |
624 | continue; |
625 | } | |
626 | ||
627 | DEBUG("found '%s' free lodev", path); | |
628 | ||
629 | ret = setup_lodev(rootfs, fd, &loinfo); | |
630 | if (!ret) | |
a17b1e65 | 631 | ret = mount_unknown_fs(path, target, options); |
a6afdde9 DL |
632 | close(fd); |
633 | ||
634 | break; | |
635 | } | |
636 | ||
637 | if (closedir(dir)) | |
638 | WARN("failed to close directory"); | |
639 | ||
640 | return ret; | |
78ae2fcc | 641 | } |
642 | ||
a17b1e65 SG |
643 | static int mount_rootfs_block(const char *rootfs, const char *target, |
644 | const char *options) | |
a6afdde9 | 645 | { |
a17b1e65 | 646 | return mount_unknown_fs(rootfs, target, options); |
a6afdde9 DL |
647 | } |
648 | ||
0c547523 SH |
649 | /* |
650 | * pin_rootfs | |
b7ed4bf0 CS |
651 | * if rootfs is a directory, then open ${rootfs}/lxc.hold for writing for |
652 | * the duration of the container run, to prevent the container from marking | |
653 | * the underlying fs readonly on shutdown. unlink the file immediately so | |
654 | * no name pollution is happens | |
0c547523 SH |
655 | * return -1 on error. |
656 | * return -2 if nothing needed to be pinned. | |
657 | * return an open fd (>=0) if we pinned it. | |
658 | */ | |
659 | int pin_rootfs(const char *rootfs) | |
660 | { | |
661 | char absrootfs[MAXPATHLEN]; | |
662 | char absrootfspin[MAXPATHLEN]; | |
663 | struct stat s; | |
664 | int ret, fd; | |
665 | ||
e99ee0de | 666 | if (rootfs == NULL || strlen(rootfs) == 0) |
0d03360a | 667 | return -2; |
e99ee0de | 668 | |
00ec333b | 669 | if (!realpath(rootfs, absrootfs)) |
9be53773 | 670 | return -2; |
0c547523 | 671 | |
00ec333b | 672 | if (access(absrootfs, F_OK)) |
0c547523 | 673 | return -1; |
0c547523 | 674 | |
00ec333b | 675 | if (stat(absrootfs, &s)) |
0c547523 | 676 | return -1; |
0c547523 | 677 | |
72f919c4 | 678 | if (!S_ISDIR(s.st_mode)) |
0c547523 SH |
679 | return -2; |
680 | ||
b7ed4bf0 | 681 | ret = snprintf(absrootfspin, MAXPATHLEN, "%s/lxc.hold", absrootfs); |
00ec333b | 682 | if (ret >= MAXPATHLEN) |
0c547523 | 683 | return -1; |
0c547523 SH |
684 | |
685 | fd = open(absrootfspin, O_CREAT | O_RDWR, S_IWUSR|S_IRUSR); | |
b7ed4bf0 CS |
686 | if (fd < 0) |
687 | return fd; | |
688 | (void)unlink(absrootfspin); | |
0c547523 SH |
689 | return fd; |
690 | } | |
691 | ||
e2a7e8dc SH |
692 | /* |
693 | * If we are asking to remount something, make sure that any | |
694 | * NOEXEC etc are honored. | |
695 | */ | |
696 | static unsigned long add_required_remount_flags(const char *s, const char *d, | |
697 | unsigned long flags) | |
698 | { | |
614305f3 | 699 | #ifdef HAVE_STATVFS |
e2a7e8dc SH |
700 | struct statvfs sb; |
701 | unsigned long required_flags = 0; | |
702 | ||
703 | if (!(flags & MS_REMOUNT)) | |
704 | return flags; | |
705 | ||
706 | if (!s) | |
707 | s = d; | |
708 | ||
709 | if (!s) | |
710 | return flags; | |
711 | if (statvfs(s, &sb) < 0) | |
712 | return flags; | |
713 | ||
714 | if (sb.f_flag & MS_NOSUID) | |
715 | required_flags |= MS_NOSUID; | |
716 | if (sb.f_flag & MS_NODEV) | |
717 | required_flags |= MS_NODEV; | |
718 | if (sb.f_flag & MS_RDONLY) | |
719 | required_flags |= MS_RDONLY; | |
720 | if (sb.f_flag & MS_NOEXEC) | |
721 | required_flags |= MS_NOEXEC; | |
722 | ||
723 | return flags | required_flags; | |
614305f3 SH |
724 | #else |
725 | return flags; | |
726 | #endif | |
e2a7e8dc SH |
727 | } |
728 | ||
4fb3cba5 | 729 | static int lxc_mount_auto_mounts(struct lxc_conf *conf, int flags, struct lxc_handler *handler) |
368bbc02 | 730 | { |
368bbc02 | 731 | int r; |
b06b8511 CS |
732 | size_t i; |
733 | static struct { | |
734 | int match_mask; | |
735 | int match_flag; | |
736 | const char *source; | |
737 | const char *destination; | |
738 | const char *fstype; | |
739 | unsigned long flags; | |
740 | const char *options; | |
741 | } default_mounts[] = { | |
742 | /* Read-only bind-mounting... In older kernels, doing that required | |
743 | * to do one MS_BIND mount and then MS_REMOUNT|MS_RDONLY the same | |
744 | * one. According to mount(2) manpage, MS_BIND honors MS_RDONLY from | |
745 | * kernel 2.6.26 onwards. However, this apparently does not work on | |
746 | * kernel 3.8. Unfortunately, on that very same kernel, doing the | |
747 | * same trick as above doesn't seem to work either, there one needs | |
748 | * to ALSO specify MS_BIND for the remount, otherwise the entire | |
749 | * fs is remounted read-only or the mount fails because it's busy... | |
750 | * MS_REMOUNT|MS_BIND|MS_RDONLY seems to work for kernels as low as | |
751 | * 2.6.32... | |
368bbc02 | 752 | */ |
f24a52d5 SG |
753 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, |
754 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys", "%r/proc/sys", NULL, MS_BIND, NULL }, | |
755 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
756 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sysrq-trigger", "%r/proc/sysrq-trigger", NULL, MS_BIND, NULL }, | |
757 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sysrq-trigger", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
758 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_RW, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
759 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RW, "sysfs", "%r/sys", "sysfs", 0, NULL }, | |
760 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RO, "sysfs", "%r/sys", "sysfs", MS_RDONLY, NULL }, | |
761 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys", "sysfs", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
762 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "%r/sys", "%r/sys", NULL, MS_BIND, NULL }, | |
763 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, NULL, "%r/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
764 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys/devices/virtual/net", "sysfs", 0, NULL }, | |
765 | { 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 }, | |
766 | { 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 }, | |
767 | { 0, 0, NULL, NULL, NULL, 0, NULL } | |
b06b8511 | 768 | }; |
368bbc02 | 769 | |
b06b8511 CS |
770 | for (i = 0; default_mounts[i].match_mask; i++) { |
771 | if ((flags & default_mounts[i].match_mask) == default_mounts[i].match_flag) { | |
772 | char *source = NULL; | |
773 | char *destination = NULL; | |
774 | int saved_errno; | |
e2a7e8dc | 775 | unsigned long mflags; |
b06b8511 CS |
776 | |
777 | if (default_mounts[i].source) { | |
778 | /* will act like strdup if %r is not present */ | |
779 | source = lxc_string_replace("%r", conf->rootfs.mount, default_mounts[i].source); | |
780 | if (!source) { | |
781 | SYSERROR("memory allocation error"); | |
782 | return -1; | |
783 | } | |
784 | } | |
785 | if (default_mounts[i].destination) { | |
786 | /* will act like strdup if %r is not present */ | |
787 | destination = lxc_string_replace("%r", conf->rootfs.mount, default_mounts[i].destination); | |
788 | if (!destination) { | |
789 | saved_errno = errno; | |
790 | SYSERROR("memory allocation error"); | |
791 | free(source); | |
792 | errno = saved_errno; | |
793 | return -1; | |
794 | } | |
795 | } | |
e2a7e8dc SH |
796 | mflags = add_required_remount_flags(source, destination, |
797 | default_mounts[i].flags); | |
798 | r = mount(source, destination, default_mounts[i].fstype, mflags, default_mounts[i].options); | |
b06b8511 | 799 | saved_errno = errno; |
c414be25 | 800 | if (r < 0) |
e2a7e8dc | 801 | SYSERROR("error mounting %s on %s flags %lu", source, destination, mflags); |
f24a52d5 | 802 | |
b06b8511 CS |
803 | free(source); |
804 | free(destination); | |
805 | if (r < 0) { | |
b06b8511 CS |
806 | errno = saved_errno; |
807 | return -1; | |
808 | } | |
368bbc02 | 809 | } |
368bbc02 CS |
810 | } |
811 | ||
b06b8511 | 812 | if (flags & LXC_AUTO_CGROUP_MASK) { |
0769b82a CS |
813 | int cg_flags; |
814 | ||
815 | cg_flags = flags & LXC_AUTO_CGROUP_MASK; | |
816 | /* If the type of cgroup mount was not specified, it depends on the | |
817 | * container's capabilities as to what makes sense: if we have | |
818 | * CAP_SYS_ADMIN, the read-only part can be remounted read-write | |
819 | * anyway, so we may as well default to read-write; then the admin | |
820 | * will not be given a false sense of security. (And if they really | |
821 | * want mixed r/o r/w, then they can explicitly specify :mixed.) | |
822 | * OTOH, if the container lacks CAP_SYS_ADMIN, do only default to | |
823 | * :mixed, because then the container can't remount it read-write. */ | |
824 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC || cg_flags == LXC_AUTO_CGROUP_FULL_NOSPEC) { | |
825 | int has_sys_admin = 0; | |
826 | if (!lxc_list_empty(&conf->keepcaps)) { | |
827 | has_sys_admin = in_caplist(CAP_SYS_ADMIN, &conf->keepcaps); | |
828 | } else { | |
829 | has_sys_admin = !in_caplist(CAP_SYS_ADMIN, &conf->caps); | |
830 | } | |
831 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC) { | |
832 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_RW : LXC_AUTO_CGROUP_MIXED; | |
833 | } else { | |
834 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_FULL_RW : LXC_AUTO_CGROUP_FULL_MIXED; | |
835 | } | |
836 | } | |
837 | ||
838 | if (!cgroup_mount(conf->rootfs.mount, handler, cg_flags)) { | |
368bbc02 | 839 | SYSERROR("error mounting /sys/fs/cgroup"); |
b06b8511 | 840 | return -1; |
368bbc02 CS |
841 | } |
842 | } | |
843 | ||
368bbc02 | 844 | return 0; |
368bbc02 CS |
845 | } |
846 | ||
a17b1e65 | 847 | static int mount_rootfs(const char *rootfs, const char *target, const char *options) |
0ad19a3f | 848 | { |
b09ef133 | 849 | char absrootfs[MAXPATHLEN]; |
78ae2fcc | 850 | struct stat s; |
a6afdde9 | 851 | int i; |
78ae2fcc | 852 | |
a17b1e65 | 853 | typedef int (*rootfs_cb)(const char *, const char *, const char *); |
78ae2fcc | 854 | |
855 | struct rootfs_type { | |
856 | int type; | |
857 | rootfs_cb cb; | |
858 | } rtfs_type[] = { | |
2656d231 DL |
859 | { S_IFDIR, mount_rootfs_dir }, |
860 | { S_IFBLK, mount_rootfs_block }, | |
861 | { S_IFREG, mount_rootfs_file }, | |
78ae2fcc | 862 | }; |
0ad19a3f | 863 | |
4c8ab83b | 864 | if (!realpath(rootfs, absrootfs)) { |
36eb9bde | 865 | SYSERROR("failed to get real path for '%s'", rootfs); |
4c8ab83b | 866 | return -1; |
867 | } | |
b09ef133 | 868 | |
b09ef133 | 869 | if (access(absrootfs, F_OK)) { |
36eb9bde | 870 | SYSERROR("'%s' is not accessible", absrootfs); |
b09ef133 | 871 | return -1; |
872 | } | |
873 | ||
78ae2fcc | 874 | if (stat(absrootfs, &s)) { |
36eb9bde | 875 | SYSERROR("failed to stat '%s'", absrootfs); |
9b0f0477 | 876 | return -1; |
877 | } | |
878 | ||
78ae2fcc | 879 | for (i = 0; i < sizeof(rtfs_type)/sizeof(rtfs_type[0]); i++) { |
9b0f0477 | 880 | |
78ae2fcc | 881 | if (!__S_ISTYPE(s.st_mode, rtfs_type[i].type)) |
882 | continue; | |
9b0f0477 | 883 | |
a17b1e65 | 884 | return rtfs_type[i].cb(absrootfs, target, options); |
78ae2fcc | 885 | } |
9b0f0477 | 886 | |
36eb9bde | 887 | ERROR("unsupported rootfs type for '%s'", absrootfs); |
78ae2fcc | 888 | return -1; |
0ad19a3f | 889 | } |
890 | ||
4e5440c6 | 891 | static int setup_utsname(struct utsname *utsname) |
0ad19a3f | 892 | { |
4e5440c6 DL |
893 | if (!utsname) |
894 | return 0; | |
0ad19a3f | 895 | |
4e5440c6 DL |
896 | if (sethostname(utsname->nodename, strlen(utsname->nodename))) { |
897 | SYSERROR("failed to set the hostname to '%s'", utsname->nodename); | |
0ad19a3f | 898 | return -1; |
899 | } | |
900 | ||
4e5440c6 | 901 | INFO("'%s' hostname has been setup", utsname->nodename); |
cd54d859 | 902 | |
0ad19a3f | 903 | return 0; |
904 | } | |
905 | ||
69aa6655 DE |
906 | struct dev_symlinks { |
907 | const char *oldpath; | |
908 | const char *name; | |
909 | }; | |
910 | ||
911 | static const struct dev_symlinks dev_symlinks[] = { | |
912 | {"/proc/self/fd", "fd"}, | |
913 | {"/proc/self/fd/0", "stdin"}, | |
914 | {"/proc/self/fd/1", "stdout"}, | |
915 | {"/proc/self/fd/2", "stderr"}, | |
916 | }; | |
917 | ||
918 | static int setup_dev_symlinks(const struct lxc_rootfs *rootfs) | |
919 | { | |
920 | char path[MAXPATHLEN]; | |
921 | int ret,i; | |
09227be2 | 922 | struct stat s; |
69aa6655 DE |
923 | |
924 | ||
925 | for (i = 0; i < sizeof(dev_symlinks) / sizeof(dev_symlinks[0]); i++) { | |
926 | const struct dev_symlinks *d = &dev_symlinks[i]; | |
927 | ret = snprintf(path, sizeof(path), "%s/dev/%s", rootfs->mount, d->name); | |
928 | if (ret < 0 || ret >= MAXPATHLEN) | |
929 | return -1; | |
09227be2 MW |
930 | |
931 | /* | |
932 | * Stat the path first. If we don't get an error | |
933 | * accept it as is and don't try to create it | |
934 | */ | |
935 | if (!stat(path, &s)) { | |
936 | continue; | |
937 | } | |
938 | ||
69aa6655 | 939 | ret = symlink(d->oldpath, path); |
09227be2 | 940 | |
69aa6655 | 941 | if (ret && errno != EEXIST) { |
09227be2 MW |
942 | if ( errno == EROFS ) { |
943 | WARN("Warning: Read Only file system while creating %s", path); | |
944 | } else { | |
945 | SYSERROR("Error creating %s", path); | |
946 | return -1; | |
947 | } | |
69aa6655 DE |
948 | } |
949 | } | |
950 | return 0; | |
951 | } | |
952 | ||
393903d1 SH |
953 | /* |
954 | * Build a space-separate list of ptys to pass to systemd. | |
955 | */ | |
956 | static bool append_ptyname(char **pp, char *name) | |
b0a33c1e | 957 | { |
393903d1 SH |
958 | char *p; |
959 | ||
960 | if (!*pp) { | |
961 | *pp = malloc(strlen(name) + strlen("container_ttys=") + 1); | |
962 | if (!*pp) | |
963 | return false; | |
964 | sprintf(*pp, "container_ttys=%s", name); | |
965 | return true; | |
966 | } | |
967 | p = realloc(*pp, strlen(*pp) + strlen(name) + 2); | |
968 | if (!p) | |
969 | return false; | |
970 | *pp = p; | |
971 | strcat(p, " "); | |
972 | strcat(p, name); | |
973 | return true; | |
974 | } | |
975 | ||
976 | static int setup_tty(struct lxc_conf *conf) | |
977 | { | |
978 | const struct lxc_rootfs *rootfs = &conf->rootfs; | |
979 | const struct lxc_tty_info *tty_info = &conf->tty_info; | |
980 | char *ttydir = conf->ttydir; | |
7c6ef2a2 SH |
981 | char path[MAXPATHLEN], lxcpath[MAXPATHLEN]; |
982 | int i, ret; | |
b0a33c1e | 983 | |
bc9bd0e3 DL |
984 | if (!rootfs->path) |
985 | return 0; | |
986 | ||
b0a33c1e | 987 | for (i = 0; i < tty_info->nbtty; i++) { |
988 | ||
989 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; | |
990 | ||
7c6ef2a2 | 991 | ret = snprintf(path, sizeof(path), "%s/dev/tty%d", |
12297168 | 992 | rootfs->mount, i + 1); |
7c6ef2a2 SH |
993 | if (ret >= sizeof(path)) { |
994 | ERROR("pathname too long for ttys"); | |
995 | return -1; | |
996 | } | |
997 | if (ttydir) { | |
998 | /* create dev/lxc/tty%d" */ | |
9ba8130c | 999 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/dev/%s/tty%d", |
7c6ef2a2 SH |
1000 | rootfs->mount, ttydir, i + 1); |
1001 | if (ret >= sizeof(lxcpath)) { | |
1002 | ERROR("pathname too long for ttys"); | |
1003 | return -1; | |
1004 | } | |
1005 | ret = creat(lxcpath, 0660); | |
1006 | if (ret==-1 && errno != EEXIST) { | |
959aee9c | 1007 | SYSERROR("error creating %s", lxcpath); |
7c6ef2a2 SH |
1008 | return -1; |
1009 | } | |
4d44e274 SH |
1010 | if (ret >= 0) |
1011 | close(ret); | |
7c6ef2a2 SH |
1012 | ret = unlink(path); |
1013 | if (ret && errno != ENOENT) { | |
959aee9c | 1014 | SYSERROR("error unlinking %s", path); |
7c6ef2a2 SH |
1015 | return -1; |
1016 | } | |
b0a33c1e | 1017 | |
7c6ef2a2 SH |
1018 | if (mount(pty_info->name, lxcpath, "none", MS_BIND, 0)) { |
1019 | WARN("failed to mount '%s'->'%s'", | |
1020 | pty_info->name, path); | |
1021 | continue; | |
1022 | } | |
13954cce | 1023 | |
9ba8130c SH |
1024 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/tty%d", ttydir, i+1); |
1025 | if (ret >= sizeof(lxcpath)) { | |
1026 | ERROR("tty pathname too long"); | |
1027 | return -1; | |
1028 | } | |
7c6ef2a2 SH |
1029 | ret = symlink(lxcpath, path); |
1030 | if (ret) { | |
959aee9c | 1031 | SYSERROR("failed to create symlink for tty %d", i+1); |
7c6ef2a2 SH |
1032 | return -1; |
1033 | } | |
393903d1 SH |
1034 | /* Now save the relative path in @path for append_ptyname */ |
1035 | sprintf(path, "%s/tty%d", ttydir, i + 1); | |
7c6ef2a2 | 1036 | } else { |
c6883f38 SH |
1037 | /* If we populated /dev, then we need to create /dev/ttyN */ |
1038 | if (access(path, F_OK)) { | |
1039 | ret = creat(path, 0660); | |
1040 | if (ret==-1) { | |
959aee9c | 1041 | SYSERROR("error creating %s", path); |
c6883f38 | 1042 | /* this isn't fatal, continue */ |
025ed0f3 | 1043 | } else { |
c6883f38 | 1044 | close(ret); |
025ed0f3 | 1045 | } |
c6883f38 | 1046 | } |
7c6ef2a2 SH |
1047 | if (mount(pty_info->name, path, "none", MS_BIND, 0)) { |
1048 | WARN("failed to mount '%s'->'%s'", | |
1049 | pty_info->name, path); | |
1050 | continue; | |
1051 | } | |
393903d1 SH |
1052 | /* Now save the relative path in @path for append_ptyname */ |
1053 | sprintf(path, "tty%d", i + 1); | |
1054 | } | |
1055 | if (!append_ptyname(&conf->pty_names, path)) { | |
1056 | ERROR("Error setting up container_ttys string"); | |
1057 | return -1; | |
b0a33c1e | 1058 | } |
1059 | } | |
1060 | ||
cd54d859 DL |
1061 | INFO("%d tty(s) has been setup", tty_info->nbtty); |
1062 | ||
b0a33c1e | 1063 | return 0; |
1064 | } | |
1065 | ||
bf601689 | 1066 | |
2d489f9e | 1067 | static int setup_rootfs_pivot_root(const char *rootfs, const char *pivotdir) |
bf601689 | 1068 | { |
2d489f9e | 1069 | int oldroot = -1, newroot = -1; |
bf601689 | 1070 | |
2d489f9e SH |
1071 | oldroot = open("/", O_DIRECTORY | O_RDONLY); |
1072 | if (oldroot < 0) { | |
1073 | SYSERROR("Error opening old-/ for fchdir"); | |
9ba8130c SH |
1074 | return -1; |
1075 | } | |
2d489f9e SH |
1076 | newroot = open(rootfs, O_DIRECTORY | O_RDONLY); |
1077 | if (newroot < 0) { | |
1078 | SYSERROR("Error opening new-/ for fchdir"); | |
1079 | goto fail; | |
c08556c6 | 1080 | } |
bf601689 | 1081 | |
cc6f6dd7 | 1082 | /* change into new root fs */ |
2d489f9e | 1083 | if (fchdir(newroot)) { |
cc6f6dd7 | 1084 | SYSERROR("can't chdir to new rootfs '%s'", rootfs); |
2d489f9e | 1085 | goto fail; |
cc6f6dd7 DL |
1086 | } |
1087 | ||
cc6f6dd7 | 1088 | /* pivot_root into our new root fs */ |
2d489f9e | 1089 | if (pivot_root(".", ".")) { |
cc6f6dd7 | 1090 | SYSERROR("pivot_root syscall failed"); |
2d489f9e | 1091 | goto fail; |
bf601689 | 1092 | } |
cc6f6dd7 | 1093 | |
2d489f9e SH |
1094 | /* |
1095 | * at this point the old-root is mounted on top of our new-root | |
1096 | * To unmounted it we must not be chdir'd into it, so escape back | |
1097 | * to old-root | |
1098 | */ | |
1099 | if (fchdir(oldroot) < 0) { | |
1100 | SYSERROR("Error entering oldroot"); | |
1101 | goto fail; | |
1102 | } | |
7981ea46 | 1103 | if (umount2(".", MNT_DETACH) < 0) { |
2d489f9e SH |
1104 | SYSERROR("Error detaching old root"); |
1105 | goto fail; | |
cc6f6dd7 DL |
1106 | } |
1107 | ||
2d489f9e SH |
1108 | if (fchdir(newroot) < 0) { |
1109 | SYSERROR("Error re-entering newroot"); | |
1110 | goto fail; | |
1111 | } | |
cc6f6dd7 | 1112 | |
2d489f9e SH |
1113 | close(oldroot); |
1114 | close(newroot); | |
bf601689 | 1115 | |
2d489f9e | 1116 | DEBUG("pivot_root syscall to '%s' successful", rootfs); |
bf601689 | 1117 | |
bf601689 | 1118 | return 0; |
2d489f9e SH |
1119 | |
1120 | fail: | |
1121 | if (oldroot != -1) | |
1122 | close(oldroot); | |
1123 | if (newroot != -1) | |
1124 | close(newroot); | |
1125 | return -1; | |
bf601689 MH |
1126 | } |
1127 | ||
bc6928ff | 1128 | /* |
87da4ec3 SH |
1129 | * Just create a path for /dev under $lxcpath/$name and in rootfs |
1130 | * If we hit an error, log it but don't fail yet. | |
91c3830e | 1131 | */ |
bc6928ff | 1132 | static int mount_autodev(const char *name, char *root, const char *lxcpath) |
91c3830e SH |
1133 | { |
1134 | int ret; | |
87da4ec3 SH |
1135 | size_t clen; |
1136 | char *path; | |
91c3830e | 1137 | |
959aee9c | 1138 | INFO("Mounting /dev under %s", root); |
bc6928ff | 1139 | |
87da4ec3 SH |
1140 | /* $(root) + "/dev/pts" + '\0' */ |
1141 | clen = strlen(root) + 9; | |
1142 | path = alloca(clen); | |
bc6928ff | 1143 | |
87da4ec3 SH |
1144 | ret = snprintf(path, clen, "%s/dev", root); |
1145 | if (ret < 0 || ret >= clen) | |
91c3830e | 1146 | return -1; |
bc6928ff | 1147 | |
87da4ec3 SH |
1148 | if (!dir_exists(path)) { |
1149 | WARN("No /dev on container rootfs."); | |
1150 | WARN("Proceeding without autodev setup"); | |
1151 | return 0; | |
bc6928ff | 1152 | } |
87da4ec3 SH |
1153 | |
1154 | if (mount("none", path, "tmpfs", 0, "size=100000,mode=755")) { | |
1155 | SYSERROR("Failed mounting tmpfs onto %s\n", path); | |
1156 | return false; | |
91c3830e | 1157 | } |
87da4ec3 SH |
1158 | |
1159 | INFO("Mounted tmpfs onto %s", path); | |
1160 | ||
1161 | ret = snprintf(path, clen, "%s/dev/pts", root); | |
1162 | if (ret < 0 || ret >= clen) | |
91c3830e | 1163 | return -1; |
87da4ec3 | 1164 | |
bc6928ff MW |
1165 | /* |
1166 | * If we are running on a devtmpfs mapping, dev/pts may already exist. | |
1167 | * If not, then create it and exit if that fails... | |
1168 | */ | |
87da4ec3 | 1169 | if (!dir_exists(path)) { |
bc6928ff MW |
1170 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
1171 | if (ret) { | |
1172 | SYSERROR("Failed to create /dev/pts in container"); | |
1173 | return -1; | |
1174 | } | |
91c3830e SH |
1175 | } |
1176 | ||
959aee9c | 1177 | INFO("Mounted /dev under %s", root); |
91c3830e SH |
1178 | return 0; |
1179 | } | |
1180 | ||
c6883f38 | 1181 | struct lxc_devs { |
74a3920a | 1182 | const char *name; |
c6883f38 SH |
1183 | mode_t mode; |
1184 | int maj; | |
1185 | int min; | |
1186 | }; | |
1187 | ||
74a3920a | 1188 | static const struct lxc_devs lxc_devs[] = { |
c6883f38 SH |
1189 | { "null", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 3 }, |
1190 | { "zero", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 5 }, | |
1191 | { "full", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 7 }, | |
1192 | { "urandom", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 9 }, | |
1193 | { "random", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 8 }, | |
1194 | { "tty", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 5, 0 }, | |
1195 | { "console", S_IFCHR | S_IRUSR | S_IWUSR, 5, 1 }, | |
1196 | }; | |
1197 | ||
9cb4d183 | 1198 | static int fill_autodev(const char *root) |
c6883f38 SH |
1199 | { |
1200 | int ret; | |
c6883f38 SH |
1201 | char path[MAXPATHLEN]; |
1202 | int i; | |
3a32201c | 1203 | mode_t cmask; |
c6883f38 | 1204 | |
959aee9c | 1205 | INFO("Creating initial consoles under %s/dev", root); |
91c3830e | 1206 | |
c6883f38 | 1207 | ret = snprintf(path, MAXPATHLEN, "%s/dev", root); |
91c3830e SH |
1208 | if (ret < 0 || ret >= MAXPATHLEN) { |
1209 | ERROR("Error calculating container /dev location"); | |
c6883f38 | 1210 | return -1; |
f7bee6c6 | 1211 | } |
91c3830e | 1212 | |
9cb4d183 SH |
1213 | if (!dir_exists(path)) // ignore, just don't try to fill in |
1214 | return 0; | |
1215 | ||
959aee9c | 1216 | INFO("Populating /dev under %s", root); |
3a32201c | 1217 | cmask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
c6883f38 | 1218 | for (i = 0; i < sizeof(lxc_devs) / sizeof(lxc_devs[0]); i++) { |
74a3920a | 1219 | const struct lxc_devs *d = &lxc_devs[i]; |
c6883f38 SH |
1220 | ret = snprintf(path, MAXPATHLEN, "%s/dev/%s", root, d->name); |
1221 | if (ret < 0 || ret >= MAXPATHLEN) | |
1222 | return -1; | |
1223 | ret = mknod(path, d->mode, makedev(d->maj, d->min)); | |
91c3830e | 1224 | if (ret && errno != EEXIST) { |
9cb4d183 SH |
1225 | char hostpath[MAXPATHLEN]; |
1226 | FILE *pathfile; | |
1227 | ||
1228 | // Unprivileged containers cannot create devices, so | |
1229 | // bind mount the device from the host | |
1230 | ret = snprintf(hostpath, MAXPATHLEN, "/dev/%s", d->name); | |
1231 | if (ret < 0 || ret >= MAXPATHLEN) | |
1232 | return -1; | |
1233 | pathfile = fopen(path, "wb"); | |
1234 | if (!pathfile) { | |
1235 | SYSERROR("Failed to create device mount target '%s'", path); | |
1236 | return -1; | |
1237 | } | |
1238 | fclose(pathfile); | |
1239 | if (mount(hostpath, path, 0, MS_BIND, NULL) != 0) { | |
1240 | SYSERROR("Failed bind mounting device %s from host into container", | |
1241 | d->name); | |
1242 | return -1; | |
1243 | } | |
c6883f38 SH |
1244 | } |
1245 | } | |
3a32201c | 1246 | umask(cmask); |
c6883f38 | 1247 | |
959aee9c | 1248 | INFO("Populated /dev under %s", root); |
c6883f38 SH |
1249 | return 0; |
1250 | } | |
1251 | ||
cc28d0b0 | 1252 | static int setup_rootfs(struct lxc_conf *conf) |
0ad19a3f | 1253 | { |
cc28d0b0 SH |
1254 | const struct lxc_rootfs *rootfs = &conf->rootfs; |
1255 | ||
a0f379bf DW |
1256 | if (!rootfs->path) { |
1257 | if (mount("", "/", NULL, MS_SLAVE|MS_REC, 0)) { | |
1258 | SYSERROR("Failed to make / rslave"); | |
1259 | return -1; | |
1260 | } | |
c69bd12f | 1261 | return 0; |
a0f379bf | 1262 | } |
0ad19a3f | 1263 | |
12297168 | 1264 | if (access(rootfs->mount, F_OK)) { |
b1789442 | 1265 | SYSERROR("failed to access to '%s', check it is present", |
12297168 | 1266 | rootfs->mount); |
b1789442 DL |
1267 | return -1; |
1268 | } | |
1269 | ||
9be53773 | 1270 | // First try mounting rootfs using a bdev |
76a26f55 | 1271 | struct bdev *bdev = bdev_init(conf, rootfs->path, rootfs->mount, rootfs->options); |
9be53773 | 1272 | if (bdev && bdev->ops->mount(bdev) == 0) { |
59d66af2 | 1273 | bdev_put(bdev); |
9be53773 SH |
1274 | DEBUG("mounted '%s' on '%s'", rootfs->path, rootfs->mount); |
1275 | return 0; | |
1276 | } | |
59d66af2 SH |
1277 | if (bdev) |
1278 | bdev_put(bdev); | |
a17b1e65 | 1279 | if (mount_rootfs(rootfs->path, rootfs->mount, rootfs->options)) { |
a6afdde9 | 1280 | ERROR("failed to mount rootfs"); |
c3f0a28c | 1281 | return -1; |
1282 | } | |
0ad19a3f | 1283 | |
12297168 | 1284 | DEBUG("mounted '%s' on '%s'", rootfs->path, rootfs->mount); |
c69bd12f | 1285 | |
ac778708 DL |
1286 | return 0; |
1287 | } | |
1288 | ||
91e93c71 AV |
1289 | int prepare_ramfs_root(char *root) |
1290 | { | |
1291 | char buf[LINELEN], *p; | |
1292 | char nroot[PATH_MAX]; | |
1293 | FILE *f; | |
1294 | int i; | |
1295 | char *p2; | |
1296 | ||
1297 | if (realpath(root, nroot) == NULL) | |
1298 | return -1; | |
1299 | ||
1300 | if (chdir("/") == -1) | |
1301 | return -1; | |
1302 | ||
1303 | /* | |
1304 | * We could use here MS_MOVE, but in userns this mount is | |
1305 | * locked and can't be moved. | |
1306 | */ | |
1307 | if (mount(root, "/", NULL, MS_REC | MS_BIND, NULL)) { | |
1308 | SYSERROR("Failed to move %s into /", root); | |
1309 | return -1; | |
1310 | } | |
1311 | ||
88322f77 | 1312 | if (mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL)) { |
91e93c71 AV |
1313 | SYSERROR("Failed to make . rprivate"); |
1314 | return -1; | |
1315 | } | |
1316 | ||
1317 | /* | |
1318 | * The following code cleans up inhereted mounts which are not | |
1319 | * required for CT. | |
1320 | * | |
1321 | * The mountinfo file shows not all mounts, if a few points have been | |
1322 | * unmounted between read operations from the mountinfo. So we need to | |
1323 | * read mountinfo a few times. | |
1324 | * | |
1325 | * This loop can be skipped if a container uses unserns, because all | |
1326 | * inherited mounts are locked and we should live with all this trash. | |
1327 | */ | |
1328 | while (1) { | |
1329 | int progress = 0; | |
1330 | ||
1331 | f = fopen("./proc/self/mountinfo", "r"); | |
1332 | if (!f) { | |
1333 | SYSERROR("Unable to open /proc/self/mountinfo"); | |
1334 | return -1; | |
1335 | } | |
1336 | while (fgets(buf, LINELEN, f)) { | |
1337 | for (p = buf, i=0; p && i < 4; i++) | |
1338 | p = strchr(p+1, ' '); | |
1339 | if (!p) | |
1340 | continue; | |
1341 | p2 = strchr(p+1, ' '); | |
1342 | if (!p2) | |
1343 | continue; | |
1344 | ||
1345 | *p2 = '\0'; | |
1346 | *p = '.'; | |
1347 | ||
1348 | if (strcmp(p + 1, "/") == 0) | |
1349 | continue; | |
1350 | if (strcmp(p + 1, "/proc") == 0) | |
1351 | continue; | |
1352 | ||
1353 | if (umount2(p, MNT_DETACH) == 0) | |
1354 | progress++; | |
1355 | } | |
1356 | fclose(f); | |
1357 | if (!progress) | |
1358 | break; | |
1359 | } | |
1360 | ||
1361 | if (umount2("./proc", MNT_DETACH)) { | |
1362 | SYSERROR("Unable to umount /proc"); | |
1363 | return -1; | |
1364 | } | |
1365 | ||
1366 | /* It is weird, but chdir("..") moves us in a new root */ | |
1367 | if (chdir("..") == -1) { | |
1368 | SYSERROR("Unable to change working directory"); | |
1369 | return -1; | |
1370 | } | |
1371 | ||
1372 | if (chroot(".") == -1) { | |
1373 | SYSERROR("Unable to chroot"); | |
1374 | return -1; | |
1375 | } | |
1376 | ||
1377 | return 0; | |
1378 | } | |
1379 | ||
74a3920a | 1380 | static int setup_pivot_root(const struct lxc_rootfs *rootfs) |
ac778708 | 1381 | { |
ac778708 DL |
1382 | if (!rootfs->path) |
1383 | return 0; | |
1384 | ||
91e93c71 AV |
1385 | if (detect_ramfs_rootfs()) { |
1386 | if (prepare_ramfs_root(rootfs->mount)) | |
1387 | return -1; | |
1388 | } else if (setup_rootfs_pivot_root(rootfs->mount, rootfs->pivot)) { | |
cc6f6dd7 | 1389 | ERROR("failed to setup pivot root"); |
25368b52 | 1390 | return -1; |
c69bd12f DL |
1391 | } |
1392 | ||
25368b52 | 1393 | return 0; |
0ad19a3f | 1394 | } |
1395 | ||
d852c78c | 1396 | static int setup_pts(int pts) |
3c26f34e | 1397 | { |
77890c6d SW |
1398 | char target[PATH_MAX]; |
1399 | ||
d852c78c DL |
1400 | if (!pts) |
1401 | return 0; | |
3c26f34e | 1402 | |
1403 | if (!access("/dev/pts/ptmx", F_OK) && umount("/dev/pts")) { | |
36eb9bde | 1404 | SYSERROR("failed to umount 'dev/pts'"); |
3c26f34e | 1405 | return -1; |
1406 | } | |
1407 | ||
7e40254a JTLB |
1408 | if (mkdir("/dev/pts", 0755)) { |
1409 | if ( errno != EEXIST ) { | |
1410 | SYSERROR("failed to create '/dev/pts'"); | |
1411 | return -1; | |
1412 | } | |
1413 | } | |
1414 | ||
a6afdde9 | 1415 | if (mount("devpts", "/dev/pts", "devpts", MS_MGC_VAL, |
67e5a20a | 1416 | "newinstance,ptmxmode=0666,mode=0620,gid=5")) { |
36eb9bde | 1417 | SYSERROR("failed to mount a new instance of '/dev/pts'"); |
3c26f34e | 1418 | return -1; |
1419 | } | |
1420 | ||
3c26f34e | 1421 | if (access("/dev/ptmx", F_OK)) { |
1422 | if (!symlink("/dev/pts/ptmx", "/dev/ptmx")) | |
1423 | goto out; | |
36eb9bde | 1424 | SYSERROR("failed to symlink '/dev/pts/ptmx'->'/dev/ptmx'"); |
3c26f34e | 1425 | return -1; |
1426 | } | |
1427 | ||
77890c6d SW |
1428 | if (realpath("/dev/ptmx", target) && !strcmp(target, "/dev/pts/ptmx")) |
1429 | goto out; | |
1430 | ||
3c26f34e | 1431 | /* fallback here, /dev/pts/ptmx exists just mount bind */ |
1432 | if (mount("/dev/pts/ptmx", "/dev/ptmx", "none", MS_BIND, 0)) { | |
36eb9bde | 1433 | SYSERROR("mount failed '/dev/pts/ptmx'->'/dev/ptmx'"); |
3c26f34e | 1434 | return -1; |
1435 | } | |
cd54d859 DL |
1436 | |
1437 | INFO("created new pts instance"); | |
d852c78c | 1438 | |
3c26f34e | 1439 | out: |
1440 | return 0; | |
1441 | } | |
1442 | ||
cccc74b5 DL |
1443 | static int setup_personality(int persona) |
1444 | { | |
6ff05e18 | 1445 | #if HAVE_SYS_PERSONALITY_H |
cccc74b5 DL |
1446 | if (persona == -1) |
1447 | return 0; | |
1448 | ||
1449 | if (personality(persona) < 0) { | |
1450 | SYSERROR("failed to set personality to '0x%x'", persona); | |
1451 | return -1; | |
1452 | } | |
1453 | ||
1454 | INFO("set personality to '0x%x'", persona); | |
6ff05e18 | 1455 | #endif |
cccc74b5 DL |
1456 | |
1457 | return 0; | |
1458 | } | |
1459 | ||
7c6ef2a2 | 1460 | static int setup_dev_console(const struct lxc_rootfs *rootfs, |
33fcb7a0 | 1461 | const struct lxc_console *console) |
6e590161 | 1462 | { |
63376d7d DL |
1463 | char path[MAXPATHLEN]; |
1464 | struct stat s; | |
7c6ef2a2 | 1465 | int ret; |
52e35957 | 1466 | |
7c6ef2a2 SH |
1467 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs->mount); |
1468 | if (ret >= sizeof(path)) { | |
959aee9c | 1469 | ERROR("console path too long"); |
7c6ef2a2 SH |
1470 | return -1; |
1471 | } | |
52e35957 | 1472 | |
63376d7d | 1473 | if (access(path, F_OK)) { |
466978b0 | 1474 | WARN("rootfs specified but no console found at '%s'", path); |
63376d7d | 1475 | return 0; |
52e35957 DL |
1476 | } |
1477 | ||
b5159817 DE |
1478 | if (console->master < 0) { |
1479 | INFO("no console"); | |
f78a1f32 DL |
1480 | return 0; |
1481 | } | |
ed502555 | 1482 | |
63376d7d DL |
1483 | if (stat(path, &s)) { |
1484 | SYSERROR("failed to stat '%s'", path); | |
1485 | return -1; | |
1486 | } | |
1487 | ||
1488 | if (chmod(console->name, s.st_mode)) { | |
1489 | SYSERROR("failed to set mode '0%o' to '%s'", | |
1490 | s.st_mode, console->name); | |
1491 | return -1; | |
1492 | } | |
13954cce | 1493 | |
63376d7d DL |
1494 | if (mount(console->name, path, "none", MS_BIND, 0)) { |
1495 | ERROR("failed to mount '%s' on '%s'", console->name, path); | |
6e590161 | 1496 | return -1; |
1497 | } | |
1498 | ||
63376d7d | 1499 | INFO("console has been setup"); |
7c6ef2a2 SH |
1500 | return 0; |
1501 | } | |
1502 | ||
1503 | static int setup_ttydir_console(const struct lxc_rootfs *rootfs, | |
1504 | const struct lxc_console *console, | |
1505 | char *ttydir) | |
1506 | { | |
1507 | char path[MAXPATHLEN], lxcpath[MAXPATHLEN]; | |
1508 | int ret; | |
1509 | ||
1510 | /* create rootfs/dev/<ttydir> directory */ | |
1511 | ret = snprintf(path, sizeof(path), "%s/dev/%s", rootfs->mount, | |
1512 | ttydir); | |
1513 | if (ret >= sizeof(path)) | |
1514 | return -1; | |
1515 | ret = mkdir(path, 0755); | |
1516 | if (ret && errno != EEXIST) { | |
959aee9c | 1517 | SYSERROR("failed with errno %d to create %s", errno, path); |
7c6ef2a2 SH |
1518 | return -1; |
1519 | } | |
959aee9c | 1520 | INFO("created %s", path); |
7c6ef2a2 SH |
1521 | |
1522 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/dev/%s/console", | |
1523 | rootfs->mount, ttydir); | |
1524 | if (ret >= sizeof(lxcpath)) { | |
959aee9c | 1525 | ERROR("console path too long"); |
7c6ef2a2 SH |
1526 | return -1; |
1527 | } | |
1528 | ||
1529 | snprintf(path, sizeof(path), "%s/dev/console", rootfs->mount); | |
1530 | ret = unlink(path); | |
1531 | if (ret && errno != ENOENT) { | |
959aee9c | 1532 | SYSERROR("error unlinking %s", path); |
7c6ef2a2 SH |
1533 | return -1; |
1534 | } | |
1535 | ||
1536 | ret = creat(lxcpath, 0660); | |
1537 | if (ret==-1 && errno != EEXIST) { | |
959aee9c | 1538 | SYSERROR("error %d creating %s", errno, lxcpath); |
7c6ef2a2 SH |
1539 | return -1; |
1540 | } | |
4d44e274 SH |
1541 | if (ret >= 0) |
1542 | close(ret); | |
7c6ef2a2 | 1543 | |
b5159817 DE |
1544 | if (console->master < 0) { |
1545 | INFO("no console"); | |
7c6ef2a2 SH |
1546 | return 0; |
1547 | } | |
1548 | ||
1549 | if (mount(console->name, lxcpath, "none", MS_BIND, 0)) { | |
1550 | ERROR("failed to mount '%s' on '%s'", console->name, lxcpath); | |
1551 | return -1; | |
1552 | } | |
1553 | ||
1554 | /* create symlink from rootfs/dev/console to 'lxc/console' */ | |
9ba8130c SH |
1555 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/console", ttydir); |
1556 | if (ret >= sizeof(lxcpath)) { | |
1557 | ERROR("lxc/console path too long"); | |
1558 | return -1; | |
1559 | } | |
7c6ef2a2 SH |
1560 | ret = symlink(lxcpath, path); |
1561 | if (ret) { | |
1562 | SYSERROR("failed to create symlink for console"); | |
1563 | return -1; | |
1564 | } | |
1565 | ||
1566 | INFO("console has been setup on %s", lxcpath); | |
cd54d859 | 1567 | |
6e590161 | 1568 | return 0; |
1569 | } | |
1570 | ||
7c6ef2a2 SH |
1571 | static int setup_console(const struct lxc_rootfs *rootfs, |
1572 | const struct lxc_console *console, | |
1573 | char *ttydir) | |
1574 | { | |
1575 | /* We don't have a rootfs, /dev/console will be shared */ | |
1576 | if (!rootfs->path) | |
1577 | return 0; | |
1578 | if (!ttydir) | |
1579 | return setup_dev_console(rootfs, console); | |
1580 | ||
1581 | return setup_ttydir_console(rootfs, console, ttydir); | |
1582 | } | |
1583 | ||
1bd051a6 SH |
1584 | static int setup_kmsg(const struct lxc_rootfs *rootfs, |
1585 | const struct lxc_console *console) | |
1586 | { | |
1587 | char kpath[MAXPATHLEN]; | |
1588 | int ret; | |
1589 | ||
222fea5a DE |
1590 | if (!rootfs->path) |
1591 | return 0; | |
1bd051a6 SH |
1592 | ret = snprintf(kpath, sizeof(kpath), "%s/dev/kmsg", rootfs->mount); |
1593 | if (ret < 0 || ret >= sizeof(kpath)) | |
1594 | return -1; | |
1595 | ||
1596 | ret = unlink(kpath); | |
1597 | if (ret && errno != ENOENT) { | |
959aee9c | 1598 | SYSERROR("error unlinking %s", kpath); |
1bd051a6 SH |
1599 | return -1; |
1600 | } | |
1601 | ||
1602 | ret = symlink("console", kpath); | |
1603 | if (ret) { | |
1604 | SYSERROR("failed to create symlink for kmsg"); | |
1605 | return -1; | |
1606 | } | |
1607 | ||
1608 | return 0; | |
1609 | } | |
1610 | ||
998ac676 RT |
1611 | static void parse_mntopt(char *opt, unsigned long *flags, char **data) |
1612 | { | |
1613 | struct mount_opt *mo; | |
1614 | ||
1615 | /* If opt is found in mount_opt, set or clear flags. | |
1616 | * Otherwise append it to data. */ | |
1617 | ||
1618 | for (mo = &mount_opt[0]; mo->name != NULL; mo++) { | |
1619 | if (!strncmp(opt, mo->name, strlen(mo->name))) { | |
1620 | if (mo->clear) | |
1621 | *flags &= ~mo->flag; | |
1622 | else | |
1623 | *flags |= mo->flag; | |
1624 | return; | |
1625 | } | |
1626 | } | |
1627 | ||
1628 | if (strlen(*data)) | |
1629 | strcat(*data, ","); | |
1630 | strcat(*data, opt); | |
1631 | } | |
1632 | ||
a17b1e65 | 1633 | int parse_mntopts(const char *mntopts, unsigned long *mntflags, |
998ac676 RT |
1634 | char **mntdata) |
1635 | { | |
1636 | char *s, *data; | |
1637 | char *p, *saveptr = NULL; | |
1638 | ||
911324ef | 1639 | *mntdata = NULL; |
91656ce5 | 1640 | *mntflags = 0L; |
911324ef DL |
1641 | |
1642 | if (!mntopts) | |
998ac676 RT |
1643 | return 0; |
1644 | ||
911324ef | 1645 | s = strdup(mntopts); |
998ac676 | 1646 | if (!s) { |
36eb9bde | 1647 | SYSERROR("failed to allocate memory"); |
998ac676 RT |
1648 | return -1; |
1649 | } | |
1650 | ||
1651 | data = malloc(strlen(s) + 1); | |
1652 | if (!data) { | |
36eb9bde | 1653 | SYSERROR("failed to allocate memory"); |
998ac676 RT |
1654 | free(s); |
1655 | return -1; | |
1656 | } | |
1657 | *data = 0; | |
1658 | ||
1659 | for (p = strtok_r(s, ",", &saveptr); p != NULL; | |
1660 | p = strtok_r(NULL, ",", &saveptr)) | |
1661 | parse_mntopt(p, mntflags, &data); | |
1662 | ||
1663 | if (*data) | |
1664 | *mntdata = data; | |
1665 | else | |
1666 | free(data); | |
1667 | free(s); | |
1668 | ||
1669 | return 0; | |
1670 | } | |
1671 | ||
6fd5e769 SH |
1672 | static void null_endofword(char *word) |
1673 | { | |
1674 | while (*word && *word != ' ' && *word != '\t') | |
1675 | word++; | |
1676 | *word = '\0'; | |
1677 | } | |
1678 | ||
1679 | /* | |
1680 | * skip @nfields spaces in @src | |
1681 | */ | |
1682 | static char *get_field(char *src, int nfields) | |
1683 | { | |
1684 | char *p = src; | |
1685 | int i; | |
1686 | ||
1687 | for (i = 0; i < nfields; i++) { | |
1688 | while (*p && *p != ' ' && *p != '\t') | |
1689 | p++; | |
1690 | if (!*p) | |
1691 | break; | |
1692 | p++; | |
1693 | } | |
1694 | return p; | |
1695 | } | |
1696 | ||
911324ef DL |
1697 | static int mount_entry(const char *fsname, const char *target, |
1698 | const char *fstype, unsigned long mountflags, | |
1fc64d22 | 1699 | const char *data, int optional) |
911324ef | 1700 | { |
614305f3 | 1701 | #ifdef HAVE_STATVFS |
2938f7c8 | 1702 | struct statvfs sb; |
614305f3 | 1703 | #endif |
2938f7c8 | 1704 | |
911324ef | 1705 | if (mount(fsname, target, fstype, mountflags & ~MS_REMOUNT, data)) { |
1fc64d22 SG |
1706 | if (optional) { |
1707 | INFO("failed to mount '%s' on '%s' (optional): %s", fsname, | |
1708 | target, strerror(errno)); | |
1709 | return 0; | |
1710 | } | |
1711 | else { | |
1712 | SYSERROR("failed to mount '%s' on '%s'", fsname, target); | |
1713 | return -1; | |
1714 | } | |
911324ef DL |
1715 | } |
1716 | ||
1717 | if ((mountflags & MS_REMOUNT) || (mountflags & MS_BIND)) { | |
2938f7c8 SH |
1718 | DEBUG("remounting %s on %s to respect bind or remount options", |
1719 | fsname ? fsname : "(none)", target ? target : "(none)"); | |
7c5b6e7c AS |
1720 | unsigned long rqd_flags = 0; |
1721 | if (mountflags & MS_RDONLY) | |
1722 | rqd_flags |= MS_RDONLY; | |
614305f3 | 1723 | #ifdef HAVE_STATVFS |
2938f7c8 | 1724 | if (statvfs(fsname, &sb) == 0) { |
7c5b6e7c | 1725 | unsigned long required_flags = rqd_flags; |
2938f7c8 SH |
1726 | if (sb.f_flag & MS_NOSUID) |
1727 | required_flags |= MS_NOSUID; | |
1728 | if (sb.f_flag & MS_NODEV) | |
1729 | required_flags |= MS_NODEV; | |
1730 | if (sb.f_flag & MS_RDONLY) | |
1731 | required_flags |= MS_RDONLY; | |
1732 | if (sb.f_flag & MS_NOEXEC) | |
1733 | required_flags |= MS_NOEXEC; | |
1734 | DEBUG("(at remount) flags for %s was %lu, required extra flags are %lu", fsname, sb.f_flag, required_flags); | |
1735 | /* | |
1736 | * If this was a bind mount request, and required_flags | |
1737 | * does not have any flags which are not already in | |
1738 | * mountflags, then skip the remount | |
1739 | */ | |
1740 | if (!(mountflags & MS_REMOUNT)) { | |
7c5b6e7c | 1741 | if (!(required_flags & ~mountflags) && rqd_flags == 0) { |
2938f7c8 SH |
1742 | DEBUG("mountflags already was %lu, skipping remount", |
1743 | mountflags); | |
1744 | goto skipremount; | |
1745 | } | |
1746 | } | |
1747 | mountflags |= required_flags; | |
6fd5e769 | 1748 | } |
614305f3 | 1749 | #endif |
911324ef DL |
1750 | |
1751 | if (mount(fsname, target, fstype, | |
1752 | mountflags | MS_REMOUNT, data)) { | |
1fc64d22 SG |
1753 | if (optional) { |
1754 | INFO("failed to mount '%s' on '%s' (optional): %s", | |
1755 | fsname, target, strerror(errno)); | |
1756 | return 0; | |
1757 | } | |
1758 | else { | |
1759 | SYSERROR("failed to mount '%s' on '%s'", | |
1760 | fsname, target); | |
1761 | return -1; | |
1762 | } | |
911324ef DL |
1763 | } |
1764 | } | |
1765 | ||
614305f3 | 1766 | #ifdef HAVE_STATVFS |
6fd5e769 | 1767 | skipremount: |
614305f3 | 1768 | #endif |
911324ef DL |
1769 | DEBUG("mounted '%s' on '%s', type '%s'", fsname, target, fstype); |
1770 | ||
1771 | return 0; | |
1772 | } | |
1773 | ||
4e4ca161 SH |
1774 | /* |
1775 | * Remove 'optional', 'create=dir', and 'create=file' from mntopt | |
1776 | */ | |
1777 | static void cull_mntent_opt(struct mntent *mntent) | |
1778 | { | |
1779 | int i; | |
1780 | char *p, *p2; | |
1781 | char *list[] = {"create=dir", | |
1782 | "create=file", | |
1783 | "optional", | |
1784 | NULL }; | |
1785 | ||
1786 | for (i=0; list[i]; i++) { | |
1787 | if (!(p = strstr(mntent->mnt_opts, list[i]))) | |
1788 | continue; | |
1789 | p2 = strchr(p, ','); | |
1790 | if (!p2) { | |
1791 | /* no more mntopts, so just chop it here */ | |
1792 | *p = '\0'; | |
1793 | continue; | |
1794 | } | |
1795 | memmove(p, p2+1, strlen(p2+1)+1); | |
1796 | } | |
1797 | } | |
1798 | ||
1799 | static inline int mount_entry_on_systemfs(struct mntent *mntent) | |
0ad19a3f | 1800 | { |
998ac676 RT |
1801 | unsigned long mntflags; |
1802 | char *mntdata; | |
911324ef | 1803 | int ret; |
34cfffb3 SG |
1804 | FILE *pathfile = NULL; |
1805 | char* pathdirname = NULL; | |
4f1d50d1 | 1806 | bool optional = hasmntopt(mntent, "optional") != NULL; |
911324ef | 1807 | |
34cfffb3 | 1808 | if (hasmntopt(mntent, "create=dir")) { |
119126b6 | 1809 | if (mkdir_p(mntent->mnt_dir, 0755) < 0) { |
34cfffb3 SG |
1810 | WARN("Failed to create mount target '%s'", mntent->mnt_dir); |
1811 | ret = -1; | |
1812 | } | |
1813 | } | |
1814 | ||
1815 | if (hasmntopt(mntent, "create=file") && access(mntent->mnt_dir, F_OK)) { | |
1816 | pathdirname = strdup(mntent->mnt_dir); | |
1817 | pathdirname = dirname(pathdirname); | |
119126b6 SG |
1818 | if (mkdir_p(pathdirname, 0755) < 0) { |
1819 | WARN("Failed to create target directory"); | |
1820 | } | |
34cfffb3 SG |
1821 | pathfile = fopen(mntent->mnt_dir, "wb"); |
1822 | if (!pathfile) { | |
1823 | WARN("Failed to create mount target '%s'", mntent->mnt_dir); | |
1824 | ret = -1; | |
1825 | } | |
1826 | else | |
1827 | fclose(pathfile); | |
1828 | } | |
1829 | ||
4e4ca161 SH |
1830 | cull_mntent_opt(mntent); |
1831 | ||
a17b1e65 SG |
1832 | if (parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata) < 0) { |
1833 | free(mntdata); | |
1834 | return -1; | |
1835 | } | |
1836 | ||
911324ef | 1837 | ret = mount_entry(mntent->mnt_fsname, mntent->mnt_dir, |
1fc64d22 | 1838 | mntent->mnt_type, mntflags, mntdata, optional); |
68c152ef | 1839 | |
34cfffb3 | 1840 | free(pathdirname); |
911324ef DL |
1841 | free(mntdata); |
1842 | ||
1843 | return ret; | |
1844 | } | |
1845 | ||
4e4ca161 | 1846 | static int mount_entry_on_absolute_rootfs(struct mntent *mntent, |
80a881b2 SH |
1847 | const struct lxc_rootfs *rootfs, |
1848 | const char *lxc_name) | |
911324ef | 1849 | { |
013bd428 | 1850 | char *aux; |
59760f5d | 1851 | char path[MAXPATHLEN]; |
911324ef DL |
1852 | unsigned long mntflags; |
1853 | char *mntdata; | |
80a881b2 | 1854 | int r, ret = 0, offset; |
67e571de | 1855 | const char *lxcpath; |
34cfffb3 SG |
1856 | FILE *pathfile = NULL; |
1857 | char *pathdirname = NULL; | |
4f1d50d1 | 1858 | bool optional = hasmntopt(mntent, "optional") != NULL; |
0ad19a3f | 1859 | |
593e8478 | 1860 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
2a59a681 SH |
1861 | if (!lxcpath) { |
1862 | ERROR("Out of memory"); | |
1863 | return -1; | |
1864 | } | |
1865 | ||
80a881b2 | 1866 | /* if rootfs->path is a blockdev path, allow container fstab to |
2a59a681 SH |
1867 | * use $lxcpath/CN/rootfs as the target prefix */ |
1868 | r = snprintf(path, MAXPATHLEN, "%s/%s/rootfs", lxcpath, lxc_name); | |
80a881b2 SH |
1869 | if (r < 0 || r >= MAXPATHLEN) |
1870 | goto skipvarlib; | |
1871 | ||
1872 | aux = strstr(mntent->mnt_dir, path); | |
1873 | if (aux) { | |
1874 | offset = strlen(path); | |
1875 | goto skipabs; | |
1876 | } | |
1877 | ||
1878 | skipvarlib: | |
013bd428 DL |
1879 | aux = strstr(mntent->mnt_dir, rootfs->path); |
1880 | if (!aux) { | |
1881 | WARN("ignoring mount point '%s'", mntent->mnt_dir); | |
1882 | goto out; | |
1883 | } | |
80a881b2 SH |
1884 | offset = strlen(rootfs->path); |
1885 | ||
1886 | skipabs: | |
013bd428 | 1887 | |
9ba8130c | 1888 | r = snprintf(path, MAXPATHLEN, "%s/%s", rootfs->mount, |
80a881b2 SH |
1889 | aux + offset); |
1890 | if (r < 0 || r >= MAXPATHLEN) { | |
1891 | WARN("pathnme too long for '%s'", mntent->mnt_dir); | |
1892 | ret = -1; | |
1893 | goto out; | |
1894 | } | |
1895 | ||
34cfffb3 | 1896 | if (hasmntopt(mntent, "create=dir")) { |
119126b6 | 1897 | if (mkdir_p(path, 0755) < 0) { |
34cfffb3 SG |
1898 | WARN("Failed to create mount target '%s'", path); |
1899 | ret = -1; | |
1900 | } | |
1901 | } | |
1902 | ||
1903 | if (hasmntopt(mntent, "create=file") && access(path, F_OK)) { | |
1904 | pathdirname = strdup(path); | |
1905 | pathdirname = dirname(pathdirname); | |
119126b6 SG |
1906 | if (mkdir_p(pathdirname, 0755) < 0) { |
1907 | WARN("Failed to create target directory"); | |
1908 | } | |
34cfffb3 SG |
1909 | pathfile = fopen(path, "wb"); |
1910 | if (!pathfile) { | |
1911 | WARN("Failed to create mount target '%s'", path); | |
1912 | ret = -1; | |
1913 | } | |
1914 | else | |
1915 | fclose(pathfile); | |
1916 | } | |
4e4ca161 | 1917 | cull_mntent_opt(mntent); |
d330fe7b | 1918 | |
a17b1e65 SG |
1919 | if (parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata) < 0) { |
1920 | free(mntdata); | |
1921 | return -1; | |
1922 | } | |
1923 | ||
013bd428 | 1924 | ret = mount_entry(mntent->mnt_fsname, path, mntent->mnt_type, |
1fc64d22 | 1925 | mntflags, mntdata, optional); |
0ad19a3f | 1926 | |
a17b1e65 SG |
1927 | free(mntdata); |
1928 | ||
013bd428 | 1929 | out: |
34cfffb3 | 1930 | free(pathdirname); |
911324ef DL |
1931 | return ret; |
1932 | } | |
d330fe7b | 1933 | |
4e4ca161 | 1934 | static int mount_entry_on_relative_rootfs(struct mntent *mntent, |
911324ef DL |
1935 | const char *rootfs) |
1936 | { | |
1937 | char path[MAXPATHLEN]; | |
1938 | unsigned long mntflags; | |
1939 | char *mntdata; | |
1940 | int ret; | |
34cfffb3 SG |
1941 | FILE *pathfile = NULL; |
1942 | char *pathdirname = NULL; | |
4f1d50d1 | 1943 | bool optional = hasmntopt(mntent, "optional") != NULL; |
d330fe7b | 1944 | |
34cfffb3 | 1945 | /* relative to root mount point */ |
9ba8130c SH |
1946 | ret = snprintf(path, sizeof(path), "%s/%s", rootfs, mntent->mnt_dir); |
1947 | if (ret >= sizeof(path)) { | |
1948 | ERROR("path name too long"); | |
1949 | return -1; | |
1950 | } | |
911324ef | 1951 | |
34cfffb3 | 1952 | if (hasmntopt(mntent, "create=dir")) { |
119126b6 | 1953 | if (mkdir_p(path, 0755) < 0) { |
34cfffb3 SG |
1954 | WARN("Failed to create mount target '%s'", path); |
1955 | ret = -1; | |
1956 | } | |
1957 | } | |
1958 | ||
1959 | if (hasmntopt(mntent, "create=file") && access(path, F_OK)) { | |
1960 | pathdirname = strdup(path); | |
1961 | pathdirname = dirname(pathdirname); | |
119126b6 SG |
1962 | if (mkdir_p(pathdirname, 0755) < 0) { |
1963 | WARN("Failed to create target directory"); | |
1964 | } | |
34cfffb3 SG |
1965 | pathfile = fopen(path, "wb"); |
1966 | if (!pathfile) { | |
1967 | WARN("Failed to create mount target '%s'", path); | |
1968 | ret = -1; | |
1969 | } | |
1970 | else | |
1971 | fclose(pathfile); | |
1972 | } | |
4e4ca161 | 1973 | cull_mntent_opt(mntent); |
34cfffb3 | 1974 | |
a17b1e65 SG |
1975 | if (parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata) < 0) { |
1976 | free(mntdata); | |
1977 | return -1; | |
1978 | } | |
1979 | ||
911324ef | 1980 | ret = mount_entry(mntent->mnt_fsname, path, mntent->mnt_type, |
1fc64d22 | 1981 | mntflags, mntdata, optional); |
68c152ef | 1982 | |
34cfffb3 | 1983 | free(pathdirname); |
911324ef | 1984 | free(mntdata); |
998ac676 | 1985 | |
911324ef DL |
1986 | return ret; |
1987 | } | |
1988 | ||
80a881b2 SH |
1989 | static int mount_file_entries(const struct lxc_rootfs *rootfs, FILE *file, |
1990 | const char *lxc_name) | |
911324ef | 1991 | { |
aaf901be AM |
1992 | struct mntent mntent; |
1993 | char buf[4096]; | |
911324ef | 1994 | int ret = -1; |
e76b8764 | 1995 | |
aaf901be | 1996 | while (getmntent_r(file, &mntent, buf, sizeof(buf))) { |
e76b8764 | 1997 | |
911324ef | 1998 | if (!rootfs->path) { |
aaf901be | 1999 | if (mount_entry_on_systemfs(&mntent)) |
e76b8764 | 2000 | goto out; |
911324ef | 2001 | continue; |
e76b8764 CDC |
2002 | } |
2003 | ||
911324ef | 2004 | /* We have a separate root, mounts are relative to it */ |
aaf901be AM |
2005 | if (mntent.mnt_dir[0] != '/') { |
2006 | if (mount_entry_on_relative_rootfs(&mntent, | |
911324ef DL |
2007 | rootfs->mount)) |
2008 | goto out; | |
2009 | continue; | |
2010 | } | |
cd54d859 | 2011 | |
aaf901be | 2012 | if (mount_entry_on_absolute_rootfs(&mntent, rootfs, lxc_name)) |
911324ef | 2013 | goto out; |
0ad19a3f | 2014 | } |
cd54d859 | 2015 | |
0ad19a3f | 2016 | ret = 0; |
cd54d859 DL |
2017 | |
2018 | INFO("mount points have been setup"); | |
0ad19a3f | 2019 | out: |
e7938e9e MN |
2020 | return ret; |
2021 | } | |
2022 | ||
80a881b2 SH |
2023 | static int setup_mount(const struct lxc_rootfs *rootfs, const char *fstab, |
2024 | const char *lxc_name) | |
e7938e9e MN |
2025 | { |
2026 | FILE *file; | |
2027 | int ret; | |
2028 | ||
2029 | if (!fstab) | |
2030 | return 0; | |
2031 | ||
2032 | file = setmntent(fstab, "r"); | |
2033 | if (!file) { | |
2034 | SYSERROR("failed to use '%s'", fstab); | |
2035 | return -1; | |
2036 | } | |
2037 | ||
80a881b2 | 2038 | ret = mount_file_entries(rootfs, file, lxc_name); |
e7938e9e | 2039 | |
0ad19a3f | 2040 | endmntent(file); |
2041 | return ret; | |
2042 | } | |
2043 | ||
80a881b2 SH |
2044 | static int setup_mount_entries(const struct lxc_rootfs *rootfs, struct lxc_list *mount, |
2045 | const char *lxc_name) | |
e7938e9e MN |
2046 | { |
2047 | FILE *file; | |
2048 | struct lxc_list *iterator; | |
2049 | char *mount_entry; | |
2050 | int ret; | |
2051 | ||
2052 | file = tmpfile(); | |
2053 | if (!file) { | |
2054 | ERROR("tmpfile error: %m"); | |
2055 | return -1; | |
2056 | } | |
2057 | ||
2058 | lxc_list_for_each(iterator, mount) { | |
2059 | mount_entry = iterator->elem; | |
1d6b1976 | 2060 | fprintf(file, "%s\n", mount_entry); |
e7938e9e MN |
2061 | } |
2062 | ||
2063 | rewind(file); | |
2064 | ||
80a881b2 | 2065 | ret = mount_file_entries(rootfs, file, lxc_name); |
e7938e9e MN |
2066 | |
2067 | fclose(file); | |
2068 | return ret; | |
2069 | } | |
2070 | ||
bab88e68 CS |
2071 | static int parse_cap(const char *cap) |
2072 | { | |
2073 | char *ptr = NULL; | |
2074 | int i, capid = -1; | |
2075 | ||
7035407c DE |
2076 | if (!strcmp(cap, "none")) |
2077 | return -2; | |
2078 | ||
bab88e68 CS |
2079 | for (i = 0; i < sizeof(caps_opt)/sizeof(caps_opt[0]); i++) { |
2080 | ||
2081 | if (strcmp(cap, caps_opt[i].name)) | |
2082 | continue; | |
2083 | ||
2084 | capid = caps_opt[i].value; | |
2085 | break; | |
2086 | } | |
2087 | ||
2088 | if (capid < 0) { | |
2089 | /* try to see if it's numeric, so the user may specify | |
2090 | * capabilities that the running kernel knows about but | |
2091 | * we don't */ | |
2092 | errno = 0; | |
2093 | capid = strtol(cap, &ptr, 10); | |
2094 | if (!ptr || *ptr != '\0' || errno != 0) | |
2095 | /* not a valid number */ | |
2096 | capid = -1; | |
2097 | else if (capid > lxc_caps_last_cap()) | |
2098 | /* we have a number but it's not a valid | |
2099 | * capability */ | |
2100 | capid = -1; | |
2101 | } | |
2102 | ||
2103 | return capid; | |
2104 | } | |
2105 | ||
0769b82a CS |
2106 | int in_caplist(int cap, struct lxc_list *caps) |
2107 | { | |
2108 | struct lxc_list *iterator; | |
2109 | int capid; | |
2110 | ||
2111 | lxc_list_for_each(iterator, caps) { | |
2112 | capid = parse_cap(iterator->elem); | |
2113 | if (capid == cap) | |
2114 | return 1; | |
2115 | } | |
2116 | ||
2117 | return 0; | |
2118 | } | |
2119 | ||
81810dd1 DL |
2120 | static int setup_caps(struct lxc_list *caps) |
2121 | { | |
2122 | struct lxc_list *iterator; | |
2123 | char *drop_entry; | |
bab88e68 | 2124 | int capid; |
81810dd1 DL |
2125 | |
2126 | lxc_list_for_each(iterator, caps) { | |
2127 | ||
2128 | drop_entry = iterator->elem; | |
2129 | ||
bab88e68 | 2130 | capid = parse_cap(drop_entry); |
d55bc1ad | 2131 | |
81810dd1 | 2132 | if (capid < 0) { |
1e11be34 DL |
2133 | ERROR("unknown capability %s", drop_entry); |
2134 | return -1; | |
81810dd1 DL |
2135 | } |
2136 | ||
2137 | DEBUG("drop capability '%s' (%d)", drop_entry, capid); | |
2138 | ||
2139 | if (prctl(PR_CAPBSET_DROP, capid, 0, 0, 0)) { | |
3ec1648d SH |
2140 | SYSERROR("failed to remove %s capability", drop_entry); |
2141 | return -1; | |
2142 | } | |
81810dd1 DL |
2143 | |
2144 | } | |
2145 | ||
1fb86a7c SH |
2146 | DEBUG("capabilities have been setup"); |
2147 | ||
2148 | return 0; | |
2149 | } | |
2150 | ||
2151 | static int dropcaps_except(struct lxc_list *caps) | |
2152 | { | |
2153 | struct lxc_list *iterator; | |
2154 | char *keep_entry; | |
1fb86a7c SH |
2155 | int i, capid; |
2156 | int numcaps = lxc_caps_last_cap() + 1; | |
959aee9c | 2157 | INFO("found %d capabilities", numcaps); |
1fb86a7c | 2158 | |
2caf9a97 SH |
2159 | if (numcaps <= 0 || numcaps > 200) |
2160 | return -1; | |
2161 | ||
1fb86a7c SH |
2162 | // caplist[i] is 1 if we keep capability i |
2163 | int *caplist = alloca(numcaps * sizeof(int)); | |
2164 | memset(caplist, 0, numcaps * sizeof(int)); | |
2165 | ||
2166 | lxc_list_for_each(iterator, caps) { | |
2167 | ||
2168 | keep_entry = iterator->elem; | |
2169 | ||
bab88e68 | 2170 | capid = parse_cap(keep_entry); |
1fb86a7c | 2171 | |
7035407c DE |
2172 | if (capid == -2) |
2173 | continue; | |
2174 | ||
1fb86a7c SH |
2175 | if (capid < 0) { |
2176 | ERROR("unknown capability %s", keep_entry); | |
2177 | return -1; | |
2178 | } | |
2179 | ||
8255688a | 2180 | DEBUG("keep capability '%s' (%d)", keep_entry, capid); |
1fb86a7c SH |
2181 | |
2182 | caplist[capid] = 1; | |
2183 | } | |
2184 | for (i=0; i<numcaps; i++) { | |
2185 | if (caplist[i]) | |
2186 | continue; | |
2187 | if (prctl(PR_CAPBSET_DROP, i, 0, 0, 0)) { | |
3ec1648d SH |
2188 | SYSERROR("failed to remove capability %d", i); |
2189 | return -1; | |
2190 | } | |
1fb86a7c SH |
2191 | } |
2192 | ||
2193 | DEBUG("capabilities have been setup"); | |
81810dd1 DL |
2194 | |
2195 | return 0; | |
2196 | } | |
2197 | ||
0ad19a3f | 2198 | static int setup_hw_addr(char *hwaddr, const char *ifname) |
2199 | { | |
2200 | struct sockaddr sockaddr; | |
2201 | struct ifreq ifr; | |
2202 | int ret, fd; | |
2203 | ||
3cfc0f3a MN |
2204 | ret = lxc_convert_mac(hwaddr, &sockaddr); |
2205 | if (ret) { | |
2206 | ERROR("mac address '%s' conversion failed : %s", | |
2207 | hwaddr, strerror(-ret)); | |
0ad19a3f | 2208 | return -1; |
2209 | } | |
2210 | ||
2211 | memcpy(ifr.ifr_name, ifname, IFNAMSIZ); | |
5da6aa8c | 2212 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
0ad19a3f | 2213 | memcpy((char *) &ifr.ifr_hwaddr, (char *) &sockaddr, sizeof(sockaddr)); |
2214 | ||
2215 | fd = socket(AF_INET, SOCK_DGRAM, 0); | |
2216 | if (fd < 0) { | |
3ab87b66 | 2217 | ERROR("socket failure : %s", strerror(errno)); |
0ad19a3f | 2218 | return -1; |
2219 | } | |
2220 | ||
2221 | ret = ioctl(fd, SIOCSIFHWADDR, &ifr); | |
2222 | close(fd); | |
2223 | if (ret) | |
3ab87b66 | 2224 | ERROR("ioctl failure : %s", strerror(errno)); |
0ad19a3f | 2225 | |
5da6aa8c | 2226 | DEBUG("mac address '%s' on '%s' has been setup", hwaddr, ifr.ifr_name); |
cd54d859 | 2227 | |
0ad19a3f | 2228 | return ret; |
2229 | } | |
2230 | ||
82d5ae15 | 2231 | static int setup_ipv4_addr(struct lxc_list *ip, int ifindex) |
0ad19a3f | 2232 | { |
82d5ae15 DL |
2233 | struct lxc_list *iterator; |
2234 | struct lxc_inetdev *inetdev; | |
3cfc0f3a | 2235 | int err; |
0ad19a3f | 2236 | |
82d5ae15 DL |
2237 | lxc_list_for_each(iterator, ip) { |
2238 | ||
2239 | inetdev = iterator->elem; | |
2240 | ||
0093bb8c DL |
2241 | err = lxc_ipv4_addr_add(ifindex, &inetdev->addr, |
2242 | &inetdev->bcast, inetdev->prefix); | |
3cfc0f3a MN |
2243 | if (err) { |
2244 | ERROR("failed to setup_ipv4_addr ifindex %d : %s", | |
2245 | ifindex, strerror(-err)); | |
82d5ae15 DL |
2246 | return -1; |
2247 | } | |
2248 | } | |
2249 | ||
2250 | return 0; | |
0ad19a3f | 2251 | } |
2252 | ||
82d5ae15 | 2253 | static int setup_ipv6_addr(struct lxc_list *ip, int ifindex) |
0ad19a3f | 2254 | { |
82d5ae15 | 2255 | struct lxc_list *iterator; |
7fa9074f | 2256 | struct lxc_inet6dev *inet6dev; |
3cfc0f3a | 2257 | int err; |
0ad19a3f | 2258 | |
82d5ae15 DL |
2259 | lxc_list_for_each(iterator, ip) { |
2260 | ||
2261 | inet6dev = iterator->elem; | |
2262 | ||
b3df193c | 2263 | err = lxc_ipv6_addr_add(ifindex, &inet6dev->addr, |
0093bb8c DL |
2264 | &inet6dev->mcast, &inet6dev->acast, |
2265 | inet6dev->prefix); | |
3cfc0f3a MN |
2266 | if (err) { |
2267 | ERROR("failed to setup_ipv6_addr ifindex %d : %s", | |
2268 | ifindex, strerror(-err)); | |
82d5ae15 | 2269 | return -1; |
3cfc0f3a | 2270 | } |
82d5ae15 DL |
2271 | } |
2272 | ||
2273 | return 0; | |
0ad19a3f | 2274 | } |
2275 | ||
82d5ae15 | 2276 | static int setup_netdev(struct lxc_netdev *netdev) |
0ad19a3f | 2277 | { |
0ad19a3f | 2278 | char ifname[IFNAMSIZ]; |
0ad19a3f | 2279 | char *current_ifname = ifname; |
3cfc0f3a | 2280 | int err; |
0ad19a3f | 2281 | |
82d5ae15 DL |
2282 | /* empty network namespace */ |
2283 | if (!netdev->ifindex) { | |
b0efbac4 | 2284 | if (netdev->flags & IFF_UP) { |
d472214b | 2285 | err = lxc_netdev_up("lo"); |
3cfc0f3a MN |
2286 | if (err) { |
2287 | ERROR("failed to set the loopback up : %s", | |
2288 | strerror(-err)); | |
82d5ae15 DL |
2289 | return -1; |
2290 | } | |
82d5ae15 | 2291 | } |
40790553 SH |
2292 | if (netdev->type != LXC_NET_VETH) |
2293 | return 0; | |
2294 | netdev->ifindex = if_nametoindex(netdev->name); | |
0ad19a3f | 2295 | } |
13954cce | 2296 | |
b466dc33 | 2297 | /* get the new ifindex in case of physical netdev */ |
40790553 | 2298 | if (netdev->type == LXC_NET_PHYS) { |
b466dc33 BP |
2299 | if (!(netdev->ifindex = if_nametoindex(netdev->link))) { |
2300 | ERROR("failed to get ifindex for %s", | |
2301 | netdev->link); | |
2302 | return -1; | |
2303 | } | |
40790553 | 2304 | } |
b466dc33 | 2305 | |
82d5ae15 DL |
2306 | /* retrieve the name of the interface */ |
2307 | if (!if_indextoname(netdev->ifindex, current_ifname)) { | |
36eb9bde | 2308 | ERROR("no interface corresponding to index '%d'", |
82d5ae15 | 2309 | netdev->ifindex); |
0ad19a3f | 2310 | return -1; |
2311 | } | |
13954cce | 2312 | |
018ef520 | 2313 | /* default: let the system to choose one interface name */ |
9d083402 | 2314 | if (!netdev->name) |
fb6d9b2f DL |
2315 | netdev->name = netdev->type == LXC_NET_PHYS ? |
2316 | netdev->link : "eth%d"; | |
018ef520 | 2317 | |
82d5ae15 | 2318 | /* rename the interface name */ |
40790553 SH |
2319 | if (strcmp(ifname, netdev->name) != 0) { |
2320 | err = lxc_netdev_rename_by_name(ifname, netdev->name); | |
2321 | if (err) { | |
2322 | ERROR("failed to rename %s->%s : %s", ifname, netdev->name, | |
2323 | strerror(-err)); | |
2324 | return -1; | |
2325 | } | |
018ef520 DL |
2326 | } |
2327 | ||
2328 | /* Re-read the name of the interface because its name has changed | |
2329 | * and would be automatically allocated by the system | |
2330 | */ | |
82d5ae15 | 2331 | if (!if_indextoname(netdev->ifindex, current_ifname)) { |
018ef520 | 2332 | ERROR("no interface corresponding to index '%d'", |
82d5ae15 | 2333 | netdev->ifindex); |
018ef520 | 2334 | return -1; |
0ad19a3f | 2335 | } |
2336 | ||
82d5ae15 DL |
2337 | /* set a mac address */ |
2338 | if (netdev->hwaddr) { | |
2339 | if (setup_hw_addr(netdev->hwaddr, current_ifname)) { | |
36eb9bde | 2340 | ERROR("failed to setup hw address for '%s'", |
82d5ae15 | 2341 | current_ifname); |
0ad19a3f | 2342 | return -1; |
2343 | } | |
2344 | } | |
2345 | ||
82d5ae15 DL |
2346 | /* setup ipv4 addresses on the interface */ |
2347 | if (setup_ipv4_addr(&netdev->ipv4, netdev->ifindex)) { | |
36eb9bde | 2348 | ERROR("failed to setup ip addresses for '%s'", |
0ad19a3f | 2349 | ifname); |
2350 | return -1; | |
2351 | } | |
2352 | ||
82d5ae15 DL |
2353 | /* setup ipv6 addresses on the interface */ |
2354 | if (setup_ipv6_addr(&netdev->ipv6, netdev->ifindex)) { | |
36eb9bde | 2355 | ERROR("failed to setup ipv6 addresses for '%s'", |
0ad19a3f | 2356 | ifname); |
2357 | return -1; | |
2358 | } | |
2359 | ||
82d5ae15 | 2360 | /* set the network device up */ |
b0efbac4 | 2361 | if (netdev->flags & IFF_UP) { |
3cfc0f3a MN |
2362 | int err; |
2363 | ||
d472214b | 2364 | err = lxc_netdev_up(current_ifname); |
3cfc0f3a MN |
2365 | if (err) { |
2366 | ERROR("failed to set '%s' up : %s", current_ifname, | |
2367 | strerror(-err)); | |
0ad19a3f | 2368 | return -1; |
2369 | } | |
2370 | ||
2371 | /* the network is up, make the loopback up too */ | |
d472214b | 2372 | err = lxc_netdev_up("lo"); |
3cfc0f3a MN |
2373 | if (err) { |
2374 | ERROR("failed to set the loopback up : %s", | |
2375 | strerror(-err)); | |
0ad19a3f | 2376 | return -1; |
2377 | } | |
2378 | } | |
2379 | ||
f8fee0e2 MK |
2380 | /* We can only set up the default routes after bringing |
2381 | * up the interface, sine bringing up the interface adds | |
2382 | * the link-local routes and we can't add a default | |
2383 | * route if the gateway is not reachable. */ | |
2384 | ||
2385 | /* setup ipv4 gateway on the interface */ | |
2386 | if (netdev->ipv4_gateway) { | |
2387 | if (!(netdev->flags & IFF_UP)) { | |
2388 | ERROR("Cannot add ipv4 gateway for %s when not bringing up the interface", ifname); | |
2389 | return -1; | |
2390 | } | |
2391 | ||
2392 | if (lxc_list_empty(&netdev->ipv4)) { | |
2393 | ERROR("Cannot add ipv4 gateway for %s when not assigning an address", ifname); | |
2394 | return -1; | |
2395 | } | |
2396 | ||
2397 | err = lxc_ipv4_gateway_add(netdev->ifindex, netdev->ipv4_gateway); | |
2398 | if (err) { | |
fc739df5 SG |
2399 | err = lxc_ipv4_dest_add(netdev->ifindex, netdev->ipv4_gateway); |
2400 | if (err) { | |
2401 | ERROR("failed to add ipv4 dest for '%s': %s", | |
2402 | ifname, strerror(-err)); | |
2403 | } | |
2404 | ||
2405 | err = lxc_ipv4_gateway_add(netdev->ifindex, netdev->ipv4_gateway); | |
2406 | if (err) { | |
2407 | ERROR("failed to setup ipv4 gateway for '%s': %s", | |
2408 | ifname, strerror(-err)); | |
2409 | if (netdev->ipv4_gateway_auto) { | |
2410 | char buf[INET_ADDRSTRLEN]; | |
2411 | inet_ntop(AF_INET, netdev->ipv4_gateway, buf, sizeof(buf)); | |
2412 | ERROR("tried to set autodetected ipv4 gateway '%s'", buf); | |
2413 | } | |
2414 | return -1; | |
19a26f82 | 2415 | } |
f8fee0e2 MK |
2416 | } |
2417 | } | |
2418 | ||
2419 | /* setup ipv6 gateway on the interface */ | |
2420 | if (netdev->ipv6_gateway) { | |
2421 | if (!(netdev->flags & IFF_UP)) { | |
2422 | ERROR("Cannot add ipv6 gateway for %s when not bringing up the interface", ifname); | |
2423 | return -1; | |
2424 | } | |
2425 | ||
2426 | if (lxc_list_empty(&netdev->ipv6) && !IN6_IS_ADDR_LINKLOCAL(netdev->ipv6_gateway)) { | |
2427 | ERROR("Cannot add ipv6 gateway for %s when not assigning an address", ifname); | |
2428 | return -1; | |
2429 | } | |
2430 | ||
2431 | err = lxc_ipv6_gateway_add(netdev->ifindex, netdev->ipv6_gateway); | |
2432 | if (err) { | |
fc739df5 SG |
2433 | err = lxc_ipv6_dest_add(netdev->ifindex, netdev->ipv6_gateway); |
2434 | if (err) { | |
2435 | ERROR("failed to add ipv6 dest for '%s': %s", | |
f8fee0e2 | 2436 | ifname, strerror(-err)); |
19a26f82 | 2437 | } |
fc739df5 SG |
2438 | |
2439 | err = lxc_ipv6_gateway_add(netdev->ifindex, netdev->ipv6_gateway); | |
2440 | if (err) { | |
2441 | ERROR("failed to setup ipv6 gateway for '%s': %s", | |
2442 | ifname, strerror(-err)); | |
2443 | if (netdev->ipv6_gateway_auto) { | |
2444 | char buf[INET6_ADDRSTRLEN]; | |
2445 | inet_ntop(AF_INET6, netdev->ipv6_gateway, buf, sizeof(buf)); | |
2446 | ERROR("tried to set autodetected ipv6 gateway '%s'", buf); | |
2447 | } | |
2448 | return -1; | |
2449 | } | |
f8fee0e2 MK |
2450 | } |
2451 | } | |
2452 | ||
cd54d859 DL |
2453 | DEBUG("'%s' has been setup", current_ifname); |
2454 | ||
0ad19a3f | 2455 | return 0; |
2456 | } | |
2457 | ||
5f4535a3 | 2458 | static int setup_network(struct lxc_list *network) |
0ad19a3f | 2459 | { |
82d5ae15 | 2460 | struct lxc_list *iterator; |
82d5ae15 | 2461 | struct lxc_netdev *netdev; |
0ad19a3f | 2462 | |
5f4535a3 | 2463 | lxc_list_for_each(iterator, network) { |
cd54d859 | 2464 | |
5f4535a3 | 2465 | netdev = iterator->elem; |
82d5ae15 DL |
2466 | |
2467 | if (setup_netdev(netdev)) { | |
2468 | ERROR("failed to setup netdev"); | |
2469 | return -1; | |
2470 | } | |
2471 | } | |
cd54d859 | 2472 | |
5f4535a3 DL |
2473 | if (!lxc_list_empty(network)) |
2474 | INFO("network has been setup"); | |
cd54d859 DL |
2475 | |
2476 | return 0; | |
0ad19a3f | 2477 | } |
2478 | ||
2af6bd1b SH |
2479 | /* try to move physical nics to the init netns */ |
2480 | void restore_phys_nics_to_netns(int netnsfd, struct lxc_conf *conf) | |
2481 | { | |
2482 | int i, ret, oldfd; | |
2483 | char path[MAXPATHLEN]; | |
2484 | ||
2485 | if (netnsfd < 0) | |
2486 | return; | |
2487 | ||
2488 | ret = snprintf(path, MAXPATHLEN, "/proc/self/ns/net"); | |
2489 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2490 | WARN("Failed to open monitor netns fd"); | |
2491 | return; | |
2492 | } | |
2493 | if ((oldfd = open(path, O_RDONLY)) < 0) { | |
2494 | SYSERROR("Failed to open monitor netns fd"); | |
2495 | return; | |
2496 | } | |
2497 | if (setns(netnsfd, 0) != 0) { | |
2498 | SYSERROR("Failed to enter container netns to reset nics"); | |
2499 | close(oldfd); | |
2500 | return; | |
2501 | } | |
2502 | for (i=0; i<conf->num_savednics; i++) { | |
2503 | struct saved_nic *s = &conf->saved_nics[i]; | |
8d357196 | 2504 | if (lxc_netdev_move_by_index(s->ifindex, 1, NULL)) |
2af6bd1b SH |
2505 | WARN("Error moving nic index:%d back to host netns", |
2506 | s->ifindex); | |
2507 | } | |
2508 | if (setns(oldfd, 0) != 0) | |
2509 | SYSERROR("Failed to re-enter monitor's netns"); | |
2510 | close(oldfd); | |
2511 | } | |
2512 | ||
2513 | void lxc_rename_phys_nics_on_shutdown(int netnsfd, struct lxc_conf *conf) | |
7b35f3d6 SH |
2514 | { |
2515 | int i; | |
2516 | ||
2af6bd1b SH |
2517 | if (conf->num_savednics == 0) |
2518 | return; | |
2519 | ||
7b35f3d6 | 2520 | INFO("running to reset %d nic names", conf->num_savednics); |
2af6bd1b | 2521 | restore_phys_nics_to_netns(netnsfd, conf); |
7b35f3d6 SH |
2522 | for (i=0; i<conf->num_savednics; i++) { |
2523 | struct saved_nic *s = &conf->saved_nics[i]; | |
959aee9c | 2524 | INFO("resetting nic %d to %s", s->ifindex, s->orig_name); |
7b35f3d6 SH |
2525 | lxc_netdev_rename_by_index(s->ifindex, s->orig_name); |
2526 | free(s->orig_name); | |
2527 | } | |
2528 | conf->num_savednics = 0; | |
7b35f3d6 SH |
2529 | } |
2530 | ||
ae9242c8 SH |
2531 | static char *default_rootfs_mount = LXCROOTFSMOUNT; |
2532 | ||
7b379ab3 | 2533 | struct lxc_conf *lxc_conf_init(void) |
089cd8b8 | 2534 | { |
7b379ab3 | 2535 | struct lxc_conf *new; |
26ddeedd | 2536 | int i; |
7b379ab3 MN |
2537 | |
2538 | new = malloc(sizeof(*new)); | |
2539 | if (!new) { | |
2540 | ERROR("lxc_conf_init : %m"); | |
2541 | return NULL; | |
2542 | } | |
2543 | memset(new, 0, sizeof(*new)); | |
2544 | ||
b40a606e | 2545 | new->loglevel = LXC_LOG_PRIORITY_NOTSET; |
cccc74b5 | 2546 | new->personality = -1; |
124fa0a8 | 2547 | new->autodev = 1; |
596a818d DE |
2548 | new->console.log_path = NULL; |
2549 | new->console.log_fd = -1; | |
28a4b0e5 | 2550 | new->console.path = NULL; |
63376d7d | 2551 | new->console.peer = -1; |
b5159817 DE |
2552 | new->console.peerpty.busy = -1; |
2553 | new->console.peerpty.master = -1; | |
2554 | new->console.peerpty.slave = -1; | |
63376d7d DL |
2555 | new->console.master = -1; |
2556 | new->console.slave = -1; | |
2557 | new->console.name[0] = '\0'; | |
d2e30e99 | 2558 | new->maincmd_fd = -1; |
76a26f55 | 2559 | new->nbd_idx = -1; |
54c30e29 | 2560 | new->rootfs.mount = strdup(default_rootfs_mount); |
53f3f048 SH |
2561 | if (!new->rootfs.mount) { |
2562 | ERROR("lxc_conf_init : %m"); | |
2563 | free(new); | |
2564 | return NULL; | |
2565 | } | |
d89de239 | 2566 | new->kmsg = 0; |
7b379ab3 MN |
2567 | lxc_list_init(&new->cgroup); |
2568 | lxc_list_init(&new->network); | |
2569 | lxc_list_init(&new->mount_list); | |
81810dd1 | 2570 | lxc_list_init(&new->caps); |
1fb86a7c | 2571 | lxc_list_init(&new->keepcaps); |
f6d3e3e4 | 2572 | lxc_list_init(&new->id_map); |
f979ac15 | 2573 | lxc_list_init(&new->includes); |
4184c3e1 | 2574 | lxc_list_init(&new->aliens); |
7c661726 | 2575 | lxc_list_init(&new->environment); |
26ddeedd SH |
2576 | for (i=0; i<NUM_LXC_HOOKS; i++) |
2577 | lxc_list_init(&new->hooks[i]); | |
ee1e7aa0 | 2578 | lxc_list_init(&new->groups); |
fe4de9a6 DE |
2579 | new->lsm_aa_profile = NULL; |
2580 | new->lsm_se_context = NULL; | |
5112cd70 | 2581 | new->tmp_umount_proc = 0; |
7b379ab3 | 2582 | |
9f30a190 MM |
2583 | for (i = 0; i < LXC_NS_MAX; i++) |
2584 | new->inherit_ns_fd[i] = -1; | |
2585 | ||
7b379ab3 | 2586 | return new; |
089cd8b8 DL |
2587 | } |
2588 | ||
a589434e | 2589 | static int instantiate_veth(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2590 | { |
8634bc19 | 2591 | char veth1buf[IFNAMSIZ], *veth1; |
0e391e57 | 2592 | char veth2buf[IFNAMSIZ], *veth2; |
3cfc0f3a | 2593 | int err; |
13954cce | 2594 | |
e892973e DL |
2595 | if (netdev->priv.veth_attr.pair) |
2596 | veth1 = netdev->priv.veth_attr.pair; | |
8634bc19 | 2597 | else { |
9ba8130c SH |
2598 | err = snprintf(veth1buf, sizeof(veth1buf), "vethXXXXXX"); |
2599 | if (err >= sizeof(veth1buf)) { /* can't *really* happen, but... */ | |
2600 | ERROR("veth1 name too long"); | |
2601 | return -1; | |
2602 | } | |
a0265685 | 2603 | veth1 = lxc_mkifname(veth1buf); |
ad40563e ÇO |
2604 | if (!veth1) { |
2605 | ERROR("failed to allocate a temporary name"); | |
2606 | return -1; | |
2607 | } | |
74a2b586 JK |
2608 | /* store away for deconf */ |
2609 | memcpy(netdev->priv.veth_attr.veth1, veth1, IFNAMSIZ); | |
8634bc19 | 2610 | } |
82d5ae15 | 2611 | |
0e391e57 | 2612 | snprintf(veth2buf, sizeof(veth2buf), "vethXXXXXX"); |
a0265685 | 2613 | veth2 = lxc_mkifname(veth2buf); |
ad40563e | 2614 | if (!veth2) { |
82d5ae15 | 2615 | ERROR("failed to allocate a temporary name"); |
ad40563e | 2616 | goto out_delete; |
0ad19a3f | 2617 | } |
2618 | ||
3cfc0f3a MN |
2619 | err = lxc_veth_create(veth1, veth2); |
2620 | if (err) { | |
2e2d6a7b | 2621 | ERROR("failed to create veth pair (%s and %s): %s", veth1, veth2, |
3cfc0f3a | 2622 | strerror(-err)); |
ad40563e | 2623 | goto out_delete; |
0ad19a3f | 2624 | } |
13954cce | 2625 | |
49684c0b CS |
2626 | /* changing the high byte of the mac address to 0xfe, the bridge interface |
2627 | * will always keep the host's mac address and not take the mac address | |
2628 | * of a container */ | |
2629 | err = setup_private_host_hw_addr(veth1); | |
2630 | if (err) { | |
2e2d6a7b | 2631 | ERROR("failed to change mac address of host interface '%s': %s", |
49684c0b CS |
2632 | veth1, strerror(-err)); |
2633 | goto out_delete; | |
2634 | } | |
2635 | ||
82d5ae15 | 2636 | if (netdev->mtu) { |
d472214b | 2637 | err = lxc_netdev_set_mtu(veth1, atoi(netdev->mtu)); |
3cfc0f3a | 2638 | if (!err) |
d472214b | 2639 | err = lxc_netdev_set_mtu(veth2, atoi(netdev->mtu)); |
3cfc0f3a | 2640 | if (err) { |
2e2d6a7b | 2641 | ERROR("failed to set mtu '%s' for veth pair (%s and %s): %s", |
3cfc0f3a | 2642 | netdev->mtu, veth1, veth2, strerror(-err)); |
eb14c10a | 2643 | goto out_delete; |
75d09f83 DL |
2644 | } |
2645 | } | |
2646 | ||
3cfc0f3a MN |
2647 | if (netdev->link) { |
2648 | err = lxc_bridge_attach(netdev->link, veth1); | |
2649 | if (err) { | |
2e2d6a7b | 2650 | ERROR("failed to attach '%s' to the bridge '%s': %s", |
3cfc0f3a MN |
2651 | veth1, netdev->link, strerror(-err)); |
2652 | goto out_delete; | |
2653 | } | |
eb14c10a DL |
2654 | } |
2655 | ||
82d5ae15 DL |
2656 | netdev->ifindex = if_nametoindex(veth2); |
2657 | if (!netdev->ifindex) { | |
36eb9bde | 2658 | ERROR("failed to retrieve the index for %s", veth2); |
eb14c10a DL |
2659 | goto out_delete; |
2660 | } | |
2661 | ||
d472214b | 2662 | err = lxc_netdev_up(veth1); |
6e35af2e DL |
2663 | if (err) { |
2664 | ERROR("failed to set %s up : %s", veth1, strerror(-err)); | |
2665 | goto out_delete; | |
0ad19a3f | 2666 | } |
2667 | ||
e3b4c4c4 | 2668 | if (netdev->upscript) { |
751d9dcd DL |
2669 | err = run_script(handler->name, "net", netdev->upscript, "up", |
2670 | "veth", veth1, (char*) NULL); | |
2671 | if (err) | |
e3b4c4c4 | 2672 | goto out_delete; |
e3b4c4c4 ST |
2673 | } |
2674 | ||
a589434e | 2675 | DEBUG("instantiated veth '%s/%s', index is '%d'", |
82d5ae15 DL |
2676 | veth1, veth2, netdev->ifindex); |
2677 | ||
6ab9ab6d | 2678 | return 0; |
eb14c10a DL |
2679 | |
2680 | out_delete: | |
b84f58b9 | 2681 | lxc_netdev_delete_by_name(veth1); |
f10fad2f | 2682 | if (!netdev->priv.veth_attr.pair) |
ad40563e | 2683 | free(veth1); |
f10fad2f | 2684 | free(veth2); |
6ab9ab6d | 2685 | return -1; |
13954cce | 2686 | } |
d957ae2d | 2687 | |
74a2b586 JK |
2688 | static int shutdown_veth(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2689 | { | |
2690 | char *veth1; | |
2691 | int err; | |
2692 | ||
2693 | if (netdev->priv.veth_attr.pair) | |
2694 | veth1 = netdev->priv.veth_attr.pair; | |
2695 | else | |
2696 | veth1 = netdev->priv.veth_attr.veth1; | |
2697 | ||
2698 | if (netdev->downscript) { | |
2699 | err = run_script(handler->name, "net", netdev->downscript, | |
2700 | "down", "veth", veth1, (char*) NULL); | |
2701 | if (err) | |
2702 | return -1; | |
2703 | } | |
2704 | return 0; | |
2705 | } | |
2706 | ||
a589434e | 2707 | static int instantiate_macvlan(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2708 | { |
0e391e57 | 2709 | char peerbuf[IFNAMSIZ], *peer; |
3cfc0f3a | 2710 | int err; |
d957ae2d MT |
2711 | |
2712 | if (!netdev->link) { | |
2713 | ERROR("no link specified for macvlan netdev"); | |
2714 | return -1; | |
2715 | } | |
13954cce | 2716 | |
9ba8130c SH |
2717 | err = snprintf(peerbuf, sizeof(peerbuf), "mcXXXXXX"); |
2718 | if (err >= sizeof(peerbuf)) | |
2719 | return -1; | |
82d5ae15 | 2720 | |
a0265685 | 2721 | peer = lxc_mkifname(peerbuf); |
ad40563e | 2722 | if (!peer) { |
82d5ae15 DL |
2723 | ERROR("failed to make a temporary name"); |
2724 | return -1; | |
0ad19a3f | 2725 | } |
2726 | ||
3cfc0f3a MN |
2727 | err = lxc_macvlan_create(netdev->link, peer, |
2728 | netdev->priv.macvlan_attr.mode); | |
2729 | if (err) { | |
2730 | ERROR("failed to create macvlan interface '%s' on '%s' : %s", | |
2731 | peer, netdev->link, strerror(-err)); | |
ad40563e | 2732 | goto out; |
0ad19a3f | 2733 | } |
2734 | ||
82d5ae15 DL |
2735 | netdev->ifindex = if_nametoindex(peer); |
2736 | if (!netdev->ifindex) { | |
36eb9bde | 2737 | ERROR("failed to retrieve the index for %s", peer); |
ad40563e | 2738 | goto out; |
22ebac19 | 2739 | } |
2740 | ||
e3b4c4c4 | 2741 | if (netdev->upscript) { |
751d9dcd DL |
2742 | err = run_script(handler->name, "net", netdev->upscript, "up", |
2743 | "macvlan", netdev->link, (char*) NULL); | |
2744 | if (err) | |
ad40563e | 2745 | goto out; |
e3b4c4c4 ST |
2746 | } |
2747 | ||
a589434e | 2748 | DEBUG("instantiated macvlan '%s', index is '%d' and mode '%d'", |
e892973e | 2749 | peer, netdev->ifindex, netdev->priv.macvlan_attr.mode); |
0ad19a3f | 2750 | |
d957ae2d | 2751 | return 0; |
ad40563e ÇO |
2752 | out: |
2753 | lxc_netdev_delete_by_name(peer); | |
2754 | free(peer); | |
2755 | return -1; | |
0ad19a3f | 2756 | } |
2757 | ||
74a2b586 JK |
2758 | static int shutdown_macvlan(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2759 | { | |
2760 | int err; | |
2761 | ||
2762 | if (netdev->downscript) { | |
2763 | err = run_script(handler->name, "net", netdev->downscript, | |
2764 | "down", "macvlan", netdev->link, | |
2765 | (char*) NULL); | |
2766 | if (err) | |
2767 | return -1; | |
2768 | } | |
2769 | return 0; | |
2770 | } | |
2771 | ||
a589434e JN |
2772 | /* XXX: merge with instantiate_macvlan */ |
2773 | static int instantiate_vlan(struct lxc_handler *handler, struct lxc_netdev *netdev) | |
26c39028 JHS |
2774 | { |
2775 | char peer[IFNAMSIZ]; | |
3cfc0f3a | 2776 | int err; |
82f58d03 | 2777 | static uint16_t vlan_cntr = 0; |
26c39028 JHS |
2778 | |
2779 | if (!netdev->link) { | |
2780 | ERROR("no link specified for vlan netdev"); | |
2781 | return -1; | |
2782 | } | |
2783 | ||
82f58d03 | 2784 | err = snprintf(peer, sizeof(peer), "vlan%d-%d", netdev->priv.vlan_attr.vid, vlan_cntr++); |
9ba8130c SH |
2785 | if (err >= sizeof(peer)) { |
2786 | ERROR("peer name too long"); | |
2787 | return -1; | |
2788 | } | |
26c39028 | 2789 | |
3cfc0f3a MN |
2790 | err = lxc_vlan_create(netdev->link, peer, netdev->priv.vlan_attr.vid); |
2791 | if (err) { | |
2792 | ERROR("failed to create vlan interface '%s' on '%s' : %s", | |
2793 | peer, netdev->link, strerror(-err)); | |
26c39028 JHS |
2794 | return -1; |
2795 | } | |
2796 | ||
2797 | netdev->ifindex = if_nametoindex(peer); | |
2798 | if (!netdev->ifindex) { | |
2799 | ERROR("failed to retrieve the ifindex for %s", peer); | |
b84f58b9 | 2800 | lxc_netdev_delete_by_name(peer); |
26c39028 JHS |
2801 | return -1; |
2802 | } | |
2803 | ||
a589434e | 2804 | DEBUG("instantiated vlan '%s', ifindex is '%d'", " vlan1000", |
e892973e DL |
2805 | netdev->ifindex); |
2806 | ||
26c39028 JHS |
2807 | return 0; |
2808 | } | |
2809 | ||
74a2b586 JK |
2810 | static int shutdown_vlan(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2811 | { | |
2812 | return 0; | |
2813 | } | |
2814 | ||
a589434e | 2815 | static int instantiate_phys(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2816 | { |
6168e99f DL |
2817 | if (!netdev->link) { |
2818 | ERROR("no link specified for the physical interface"); | |
2819 | return -1; | |
2820 | } | |
2821 | ||
9d083402 | 2822 | netdev->ifindex = if_nametoindex(netdev->link); |
82d5ae15 | 2823 | if (!netdev->ifindex) { |
9d083402 | 2824 | ERROR("failed to retrieve the index for %s", netdev->link); |
0ad19a3f | 2825 | return -1; |
2826 | } | |
2827 | ||
e3b4c4c4 ST |
2828 | if (netdev->upscript) { |
2829 | int err; | |
751d9dcd DL |
2830 | err = run_script(handler->name, "net", netdev->upscript, |
2831 | "up", "phys", netdev->link, (char*) NULL); | |
2832 | if (err) | |
e3b4c4c4 | 2833 | return -1; |
e3b4c4c4 ST |
2834 | } |
2835 | ||
82d5ae15 | 2836 | return 0; |
0ad19a3f | 2837 | } |
2838 | ||
74a2b586 JK |
2839 | static int shutdown_phys(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2840 | { | |
2841 | int err; | |
2842 | ||
2843 | if (netdev->downscript) { | |
2844 | err = run_script(handler->name, "net", netdev->downscript, | |
2845 | "down", "phys", netdev->link, (char*) NULL); | |
2846 | if (err) | |
2847 | return -1; | |
2848 | } | |
2849 | return 0; | |
2850 | } | |
2851 | ||
a589434e | 2852 | static int instantiate_none(struct lxc_handler *handler, struct lxc_netdev *netdev) |
26b797f3 SH |
2853 | { |
2854 | netdev->ifindex = 0; | |
2855 | return 0; | |
2856 | } | |
2857 | ||
a589434e | 2858 | static int instantiate_empty(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2859 | { |
82d5ae15 | 2860 | netdev->ifindex = 0; |
e3b4c4c4 ST |
2861 | if (netdev->upscript) { |
2862 | int err; | |
751d9dcd DL |
2863 | err = run_script(handler->name, "net", netdev->upscript, |
2864 | "up", "empty", (char*) NULL); | |
2865 | if (err) | |
e3b4c4c4 | 2866 | return -1; |
e3b4c4c4 | 2867 | } |
82d5ae15 | 2868 | return 0; |
0ad19a3f | 2869 | } |
2870 | ||
74a2b586 JK |
2871 | static int shutdown_empty(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2872 | { | |
2873 | int err; | |
2874 | ||
2875 | if (netdev->downscript) { | |
2876 | err = run_script(handler->name, "net", netdev->downscript, | |
2877 | "down", "empty", (char*) NULL); | |
2878 | if (err) | |
2879 | return -1; | |
2880 | } | |
2881 | return 0; | |
2882 | } | |
2883 | ||
26b797f3 SH |
2884 | static int shutdown_none(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2885 | { | |
2886 | return 0; | |
2887 | } | |
2888 | ||
2889 | int lxc_requests_empty_network(struct lxc_handler *handler) | |
2890 | { | |
2891 | struct lxc_list *network = &handler->conf->network; | |
2892 | struct lxc_list *iterator; | |
2893 | struct lxc_netdev *netdev; | |
2894 | bool found_none = false, found_nic = false; | |
2895 | ||
2896 | if (lxc_list_empty(network)) | |
2897 | return 0; | |
2898 | ||
2899 | lxc_list_for_each(iterator, network) { | |
2900 | ||
2901 | netdev = iterator->elem; | |
2902 | ||
2903 | if (netdev->type == LXC_NET_NONE) | |
2904 | found_none = true; | |
2905 | else | |
2906 | found_nic = true; | |
2907 | } | |
2908 | if (found_none && !found_nic) | |
2909 | return 1; | |
2910 | return 0; | |
2911 | } | |
2912 | ||
e3b4c4c4 | 2913 | int lxc_create_network(struct lxc_handler *handler) |
0ad19a3f | 2914 | { |
e3b4c4c4 | 2915 | struct lxc_list *network = &handler->conf->network; |
82d5ae15 | 2916 | struct lxc_list *iterator; |
82d5ae15 | 2917 | struct lxc_netdev *netdev; |
cbef6c52 SH |
2918 | int am_root = (getuid() == 0); |
2919 | ||
2920 | if (!am_root) | |
2921 | return 0; | |
0ad19a3f | 2922 | |
5f4535a3 | 2923 | lxc_list_for_each(iterator, network) { |
0ad19a3f | 2924 | |
5f4535a3 | 2925 | netdev = iterator->elem; |
13954cce | 2926 | |
24654103 | 2927 | if (netdev->type < 0 || netdev->type > LXC_NET_MAXCONFTYPE) { |
82d5ae15 | 2928 | ERROR("invalid network configuration type '%d'", |
5f4535a3 | 2929 | netdev->type); |
82d5ae15 DL |
2930 | return -1; |
2931 | } | |
0ad19a3f | 2932 | |
e3b4c4c4 | 2933 | if (netdev_conf[netdev->type](handler, netdev)) { |
82d5ae15 DL |
2934 | ERROR("failed to create netdev"); |
2935 | return -1; | |
2936 | } | |
e3b4c4c4 | 2937 | |
0ad19a3f | 2938 | } |
2939 | ||
2940 | return 0; | |
2941 | } | |
2942 | ||
74a2b586 | 2943 | void lxc_delete_network(struct lxc_handler *handler) |
7fef7a06 | 2944 | { |
74a2b586 | 2945 | struct lxc_list *network = &handler->conf->network; |
7fef7a06 DL |
2946 | struct lxc_list *iterator; |
2947 | struct lxc_netdev *netdev; | |
2948 | ||
2949 | lxc_list_for_each(iterator, network) { | |
2950 | netdev = iterator->elem; | |
d472214b | 2951 | |
74a2b586 | 2952 | if (netdev->ifindex != 0 && netdev->type == LXC_NET_PHYS) { |
d8f8e352 DL |
2953 | if (lxc_netdev_rename_by_index(netdev->ifindex, netdev->link)) |
2954 | WARN("failed to rename to the initial name the " \ | |
2955 | "netdev '%s'", netdev->link); | |
d472214b | 2956 | continue; |
d8f8e352 | 2957 | } |
d472214b | 2958 | |
74a2b586 JK |
2959 | if (netdev_deconf[netdev->type](handler, netdev)) { |
2960 | WARN("failed to destroy netdev"); | |
2961 | } | |
2962 | ||
d8f8e352 DL |
2963 | /* Recent kernel remove the virtual interfaces when the network |
2964 | * namespace is destroyed but in case we did not moved the | |
2965 | * interface to the network namespace, we have to destroy it | |
2966 | */ | |
74a2b586 JK |
2967 | if (netdev->ifindex != 0 && |
2968 | lxc_netdev_delete_by_index(netdev->ifindex)) | |
d8f8e352 | 2969 | WARN("failed to remove interface '%s'", netdev->name); |
7fef7a06 DL |
2970 | } |
2971 | } | |
2972 | ||
45e854dc SG |
2973 | #define LXC_USERNIC_PATH LIBEXECDIR "/lxc/lxc-user-nic" |
2974 | ||
fe1f672f ÇO |
2975 | /* lxc-user-nic returns "interface_name:interface_name\n" */ |
2976 | #define MAX_BUFFER_SIZE IFNAMSIZ*2 + 2 | |
74a3920a | 2977 | static int unpriv_assign_nic(struct lxc_netdev *netdev, pid_t pid) |
cbef6c52 SH |
2978 | { |
2979 | pid_t child; | |
a7242d9a ÇO |
2980 | int bytes, pipefd[2]; |
2981 | char *token, *saveptr = NULL; | |
fe1f672f | 2982 | char buffer[MAX_BUFFER_SIZE]; |
cbef6c52 SH |
2983 | |
2984 | if (netdev->type != LXC_NET_VETH) { | |
2985 | ERROR("nic type %d not support for unprivileged use", | |
2986 | netdev->type); | |
2987 | return -1; | |
2988 | } | |
2989 | ||
a7242d9a ÇO |
2990 | if(pipe(pipefd) < 0) { |
2991 | SYSERROR("pipe failed"); | |
2992 | return -1; | |
2993 | } | |
2994 | ||
cbef6c52 SH |
2995 | if ((child = fork()) < 0) { |
2996 | SYSERROR("fork"); | |
a7242d9a ÇO |
2997 | close(pipefd[0]); |
2998 | close(pipefd[1]); | |
2999 | return -1; | |
3000 | } | |
3001 | ||
3002 | if (child == 0) { // child | |
3003 | /* close the read-end of the pipe */ | |
3004 | close(pipefd[0]); | |
3005 | /* redirect the stdout to write-end of the pipe */ | |
3006 | dup2(pipefd[1], STDOUT_FILENO); | |
3007 | /* close the write-end of the pipe */ | |
fe1f672f | 3008 | close(pipefd[1]); |
a7242d9a ÇO |
3009 | |
3010 | // Call lxc-user-nic pid type bridge | |
3011 | char pidstr[20]; | |
3012 | char *args[] = {LXC_USERNIC_PATH, pidstr, "veth", netdev->link, netdev->name, NULL }; | |
3013 | snprintf(pidstr, 19, "%lu", (unsigned long) pid); | |
3014 | pidstr[19] = '\0'; | |
3015 | execvp(args[0], args); | |
3016 | SYSERROR("execvp lxc-user-nic"); | |
3017 | exit(1); | |
3018 | } | |
3019 | ||
3020 | /* close the write-end of the pipe */ | |
3021 | close(pipefd[1]); | |
3022 | ||
fe1f672f | 3023 | bytes = read(pipefd[0], &buffer, MAX_BUFFER_SIZE); |
a7242d9a ÇO |
3024 | if (bytes < 0) { |
3025 | SYSERROR("read failed"); | |
3026 | } | |
3027 | buffer[bytes - 1] = '\0'; | |
3028 | ||
3029 | if (wait_for_pid(child) != 0) { | |
3030 | close(pipefd[0]); | |
cbef6c52 SH |
3031 | return -1; |
3032 | } | |
3033 | ||
a7242d9a ÇO |
3034 | /* close the read-end of the pipe */ |
3035 | close(pipefd[0]); | |
cbef6c52 | 3036 | |
a7242d9a ÇO |
3037 | /* fill netdev->name field */ |
3038 | token = strtok_r(buffer, ":", &saveptr); | |
3039 | if (!token) | |
3040 | return -1; | |
658979c5 SH |
3041 | netdev->name = malloc(IFNAMSIZ+1); |
3042 | if (!netdev->name) { | |
3043 | ERROR("Out of memory"); | |
3044 | return -1; | |
3045 | } | |
3046 | memset(netdev->name, 0, IFNAMSIZ+1); | |
3047 | strncpy(netdev->name, token, IFNAMSIZ); | |
a7242d9a ÇO |
3048 | |
3049 | /* fill netdev->veth_attr.pair field */ | |
3050 | token = strtok_r(NULL, ":", &saveptr); | |
3051 | if (!token) | |
3052 | return -1; | |
3053 | netdev->priv.veth_attr.pair = strdup(token); | |
658979c5 SH |
3054 | if (!netdev->priv.veth_attr.pair) { |
3055 | ERROR("Out of memory"); | |
3056 | return -1; | |
3057 | } | |
45e854dc | 3058 | |
a7242d9a | 3059 | return 0; |
cbef6c52 SH |
3060 | } |
3061 | ||
5f4535a3 | 3062 | int lxc_assign_network(struct lxc_list *network, pid_t pid) |
0ad19a3f | 3063 | { |
82d5ae15 | 3064 | struct lxc_list *iterator; |
82d5ae15 | 3065 | struct lxc_netdev *netdev; |
cbef6c52 | 3066 | int am_root = (getuid() == 0); |
3cfc0f3a | 3067 | int err; |
0ad19a3f | 3068 | |
5f4535a3 | 3069 | lxc_list_for_each(iterator, network) { |
82d5ae15 | 3070 | |
5f4535a3 | 3071 | netdev = iterator->elem; |
82d5ae15 | 3072 | |
fbb16259 | 3073 | if (netdev->type == LXC_NET_VETH && !am_root) { |
cbef6c52 SH |
3074 | if (unpriv_assign_nic(netdev, pid)) |
3075 | return -1; | |
658979c5 SH |
3076 | // lxc-user-nic has moved the nic to the new ns. |
3077 | // unpriv_assign_nic() fills in netdev->name. | |
3078 | // netdev->ifindex will be filed in at setup_netdev. | |
cbef6c52 SH |
3079 | continue; |
3080 | } | |
236087a6 | 3081 | |
fbb16259 SH |
3082 | /* empty network namespace, nothing to move */ |
3083 | if (!netdev->ifindex) | |
3084 | continue; | |
3085 | ||
8d357196 | 3086 | err = lxc_netdev_move_by_index(netdev->ifindex, pid, NULL); |
3cfc0f3a MN |
3087 | if (err) { |
3088 | ERROR("failed to move '%s' to the container : %s", | |
3089 | netdev->link, strerror(-err)); | |
82d5ae15 DL |
3090 | return -1; |
3091 | } | |
3092 | ||
c1c75c04 | 3093 | DEBUG("move '%s' to '%d'", netdev->name, pid); |
0ad19a3f | 3094 | } |
3095 | ||
3096 | return 0; | |
3097 | } | |
3098 | ||
251d0d2a DE |
3099 | static int write_id_mapping(enum idtype idtype, pid_t pid, const char *buf, |
3100 | size_t buf_size) | |
f6d3e3e4 SH |
3101 | { |
3102 | char path[PATH_MAX]; | |
e4ccd113 | 3103 | int ret, closeret; |
f6d3e3e4 SH |
3104 | FILE *f; |
3105 | ||
3106 | ret = snprintf(path, PATH_MAX, "/proc/%d/%cid_map", pid, idtype == ID_TYPE_UID ? 'u' : 'g'); | |
3107 | if (ret < 0 || ret >= PATH_MAX) { | |
03fadd16 | 3108 | fprintf(stderr, "%s: path name too long\n", __func__); |
f6d3e3e4 SH |
3109 | return -E2BIG; |
3110 | } | |
3111 | f = fopen(path, "w"); | |
3112 | if (!f) { | |
3113 | perror("open"); | |
3114 | return -EINVAL; | |
3115 | } | |
251d0d2a | 3116 | ret = fwrite(buf, buf_size, 1, f); |
f6d3e3e4 | 3117 | if (ret < 0) |
e4ccd113 SH |
3118 | SYSERROR("writing id mapping"); |
3119 | closeret = fclose(f); | |
3120 | if (closeret) | |
3121 | SYSERROR("writing id mapping"); | |
3122 | return ret < 0 ? ret : closeret; | |
f6d3e3e4 SH |
3123 | } |
3124 | ||
3125 | int lxc_map_ids(struct lxc_list *idmap, pid_t pid) | |
3126 | { | |
3127 | struct lxc_list *iterator; | |
3128 | struct id_map *map; | |
8afb3e61 | 3129 | int ret = 0, use_shadow = 0; |
251d0d2a | 3130 | enum idtype type; |
8afb3e61 SG |
3131 | char *buf = NULL, *pos, *cmdpath = NULL; |
3132 | ||
22038de5 SH |
3133 | /* |
3134 | * If newuidmap exists, that is, if shadow is handing out subuid | |
3135 | * ranges, then insist that root also reserve ranges in subuid. This | |
3136 | * will protected it by preventing another user from being handed the | |
3137 | * range by shadow. | |
3138 | */ | |
9d9c111c | 3139 | cmdpath = on_path("newuidmap", NULL); |
8afb3e61 SG |
3140 | if (cmdpath) { |
3141 | use_shadow = 1; | |
3142 | free(cmdpath); | |
3143 | } | |
3144 | ||
0e6e3a41 SG |
3145 | if (!use_shadow && geteuid()) { |
3146 | ERROR("Missing newuidmap/newgidmap"); | |
3147 | return -1; | |
3148 | } | |
251d0d2a DE |
3149 | |
3150 | for(type = ID_TYPE_UID; type <= ID_TYPE_GID; type++) { | |
4f7521b4 | 3151 | int left, fill; |
cf3ef16d SH |
3152 | int had_entry = 0; |
3153 | if (!buf) { | |
3154 | buf = pos = malloc(4096); | |
4f7521b4 SH |
3155 | if (!buf) |
3156 | return -ENOMEM; | |
cf3ef16d SH |
3157 | } |
3158 | pos = buf; | |
0e6e3a41 | 3159 | if (use_shadow) |
d1838f34 | 3160 | pos += sprintf(buf, "new%cidmap %d", |
cf3ef16d SH |
3161 | type == ID_TYPE_UID ? 'u' : 'g', |
3162 | pid); | |
4f7521b4 | 3163 | |
cf3ef16d SH |
3164 | lxc_list_for_each(iterator, idmap) { |
3165 | /* The kernel only takes <= 4k for writes to /proc/<nr>/[ug]id_map */ | |
251d0d2a | 3166 | map = iterator->elem; |
cf3ef16d SH |
3167 | if (map->idtype != type) |
3168 | continue; | |
3169 | ||
3170 | had_entry = 1; | |
3171 | left = 4096 - (pos - buf); | |
d1838f34 | 3172 | fill = snprintf(pos, left, "%s%lu %lu %lu%s", |
0e6e3a41 | 3173 | use_shadow ? " " : "", |
d1838f34 | 3174 | map->nsid, map->hostid, map->range, |
0e6e3a41 | 3175 | use_shadow ? "" : "\n"); |
cf3ef16d SH |
3176 | if (fill <= 0 || fill >= left) |
3177 | SYSERROR("snprintf failed, too many mappings"); | |
3178 | pos += fill; | |
251d0d2a | 3179 | } |
cf3ef16d | 3180 | if (!had_entry) |
4f7521b4 | 3181 | continue; |
cf3ef16d | 3182 | |
0e6e3a41 | 3183 | if (!use_shadow) { |
cf3ef16d | 3184 | ret = write_id_mapping(type, pid, buf, pos-buf); |
d1838f34 MS |
3185 | } else { |
3186 | left = 4096 - (pos - buf); | |
3187 | fill = snprintf(pos, left, "\n"); | |
3188 | if (fill <= 0 || fill >= left) | |
3189 | SYSERROR("snprintf failed, too many mappings"); | |
3190 | pos += fill; | |
cf3ef16d | 3191 | ret = system(buf); |
d1838f34 | 3192 | } |
cf3ef16d | 3193 | |
f6d3e3e4 SH |
3194 | if (ret) |
3195 | break; | |
3196 | } | |
251d0d2a | 3197 | |
f10fad2f | 3198 | free(buf); |
f6d3e3e4 SH |
3199 | return ret; |
3200 | } | |
3201 | ||
cf3ef16d | 3202 | /* |
7b50c609 TS |
3203 | * return the host uid/gid to which the container root is mapped in |
3204 | * *val. | |
0b3a6504 | 3205 | * Return true if id was found, false otherwise. |
cf3ef16d | 3206 | */ |
2a9a80cb | 3207 | bool get_mapped_rootid(struct lxc_conf *conf, enum idtype idtype, |
3ec1648d | 3208 | unsigned long *val) |
cf3ef16d SH |
3209 | { |
3210 | struct lxc_list *it; | |
3211 | struct id_map *map; | |
3212 | ||
3213 | lxc_list_for_each(it, &conf->id_map) { | |
3214 | map = it->elem; | |
7b50c609 | 3215 | if (map->idtype != idtype) |
cf3ef16d SH |
3216 | continue; |
3217 | if (map->nsid != 0) | |
3218 | continue; | |
2a9a80cb SH |
3219 | *val = map->hostid; |
3220 | return true; | |
cf3ef16d | 3221 | } |
2a9a80cb | 3222 | return false; |
cf3ef16d SH |
3223 | } |
3224 | ||
2133f58c | 3225 | int mapped_hostid(unsigned id, struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d SH |
3226 | { |
3227 | struct lxc_list *it; | |
3228 | struct id_map *map; | |
3229 | lxc_list_for_each(it, &conf->id_map) { | |
3230 | map = it->elem; | |
2133f58c | 3231 | if (map->idtype != idtype) |
cf3ef16d SH |
3232 | continue; |
3233 | if (id >= map->hostid && id < map->hostid + map->range) | |
57d116ab | 3234 | return (id - map->hostid) + map->nsid; |
cf3ef16d | 3235 | } |
57d116ab | 3236 | return -1; |
cf3ef16d SH |
3237 | } |
3238 | ||
2133f58c | 3239 | int find_unmapped_nsuid(struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d SH |
3240 | { |
3241 | struct lxc_list *it; | |
3242 | struct id_map *map; | |
2133f58c | 3243 | unsigned int freeid = 0; |
cf3ef16d SH |
3244 | again: |
3245 | lxc_list_for_each(it, &conf->id_map) { | |
3246 | map = it->elem; | |
2133f58c | 3247 | if (map->idtype != idtype) |
cf3ef16d SH |
3248 | continue; |
3249 | if (freeid >= map->nsid && freeid < map->nsid + map->range) { | |
3250 | freeid = map->nsid + map->range; | |
3251 | goto again; | |
3252 | } | |
3253 | } | |
3254 | return freeid; | |
3255 | } | |
3256 | ||
19a26f82 MK |
3257 | int lxc_find_gateway_addresses(struct lxc_handler *handler) |
3258 | { | |
3259 | struct lxc_list *network = &handler->conf->network; | |
3260 | struct lxc_list *iterator; | |
3261 | struct lxc_netdev *netdev; | |
3262 | int link_index; | |
3263 | ||
3264 | lxc_list_for_each(iterator, network) { | |
3265 | netdev = iterator->elem; | |
3266 | ||
3267 | if (!netdev->ipv4_gateway_auto && !netdev->ipv6_gateway_auto) | |
3268 | continue; | |
3269 | ||
3270 | if (netdev->type != LXC_NET_VETH && netdev->type != LXC_NET_MACVLAN) { | |
3271 | ERROR("gateway = auto only supported for " | |
3272 | "veth and macvlan"); | |
3273 | return -1; | |
3274 | } | |
3275 | ||
3276 | if (!netdev->link) { | |
3277 | ERROR("gateway = auto needs a link interface"); | |
3278 | return -1; | |
3279 | } | |
3280 | ||
3281 | link_index = if_nametoindex(netdev->link); | |
3282 | if (!link_index) | |
3283 | return -EINVAL; | |
3284 | ||
3285 | if (netdev->ipv4_gateway_auto) { | |
3286 | if (lxc_ipv4_addr_get(link_index, &netdev->ipv4_gateway)) { | |
3287 | ERROR("failed to automatically find ipv4 gateway " | |
3288 | "address from link interface '%s'", netdev->link); | |
3289 | return -1; | |
3290 | } | |
3291 | } | |
3292 | ||
3293 | if (netdev->ipv6_gateway_auto) { | |
3294 | if (lxc_ipv6_addr_get(link_index, &netdev->ipv6_gateway)) { | |
3295 | ERROR("failed to automatically find ipv6 gateway " | |
3296 | "address from link interface '%s'", netdev->link); | |
3297 | return -1; | |
3298 | } | |
3299 | } | |
3300 | } | |
3301 | ||
3302 | return 0; | |
3303 | } | |
3304 | ||
5e4a62bf | 3305 | int lxc_create_tty(const char *name, struct lxc_conf *conf) |
b0a33c1e | 3306 | { |
5e4a62bf | 3307 | struct lxc_tty_info *tty_info = &conf->tty_info; |
025ed0f3 | 3308 | int i, ret; |
b0a33c1e | 3309 | |
5e4a62bf DL |
3310 | /* no tty in the configuration */ |
3311 | if (!conf->tty) | |
b0a33c1e | 3312 | return 0; |
3313 | ||
13954cce | 3314 | tty_info->pty_info = |
e4e7d59d | 3315 | malloc(sizeof(*tty_info->pty_info)*conf->tty); |
b0a33c1e | 3316 | if (!tty_info->pty_info) { |
36eb9bde | 3317 | SYSERROR("failed to allocate pty_info"); |
985d15b1 | 3318 | return -1; |
b0a33c1e | 3319 | } |
3320 | ||
985d15b1 | 3321 | for (i = 0; i < conf->tty; i++) { |
13954cce | 3322 | |
b0a33c1e | 3323 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; |
3324 | ||
025ed0f3 SH |
3325 | process_lock(); |
3326 | ret = openpty(&pty_info->master, &pty_info->slave, | |
3327 | pty_info->name, NULL, NULL); | |
3328 | process_unlock(); | |
3329 | if (ret) { | |
36eb9bde | 3330 | SYSERROR("failed to create pty #%d", i); |
985d15b1 MT |
3331 | tty_info->nbtty = i; |
3332 | lxc_delete_tty(tty_info); | |
3333 | return -1; | |
b0a33c1e | 3334 | } |
3335 | ||
5332bb84 DL |
3336 | DEBUG("allocated pty '%s' (%d/%d)", |
3337 | pty_info->name, pty_info->master, pty_info->slave); | |
3338 | ||
3ec1648d | 3339 | /* Prevent leaking the file descriptors to the container */ |
b035ad62 MS |
3340 | fcntl(pty_info->master, F_SETFD, FD_CLOEXEC); |
3341 | fcntl(pty_info->slave, F_SETFD, FD_CLOEXEC); | |
3342 | ||
b0a33c1e | 3343 | pty_info->busy = 0; |
3344 | } | |
3345 | ||
985d15b1 | 3346 | tty_info->nbtty = conf->tty; |
1ac470c0 DL |
3347 | |
3348 | INFO("tty's configured"); | |
3349 | ||
985d15b1 | 3350 | return 0; |
b0a33c1e | 3351 | } |
3352 | ||
3353 | void lxc_delete_tty(struct lxc_tty_info *tty_info) | |
3354 | { | |
3355 | int i; | |
3356 | ||
3357 | for (i = 0; i < tty_info->nbtty; i++) { | |
3358 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; | |
3359 | ||
3360 | close(pty_info->master); | |
3361 | close(pty_info->slave); | |
3362 | } | |
3363 | ||
3364 | free(tty_info->pty_info); | |
3365 | tty_info->nbtty = 0; | |
3366 | } | |
3367 | ||
f6d3e3e4 | 3368 | /* |
7b50c609 TS |
3369 | * chown_mapped_root: for an unprivileged user with uid/gid X to |
3370 | * chown a dir to subuid/subgid Y, he needs to run chown as root | |
3371 | * in a userns where nsid 0 is mapped to hostuid/hostgid Y, and | |
3372 | * nsid Y is mapped to hostuid/hostgid X. That way, the container | |
3373 | * root is privileged with respect to hostuid/hostgid X, allowing | |
3374 | * him to do the chown. | |
f6d3e3e4 | 3375 | */ |
c4d10a05 | 3376 | int chown_mapped_root(char *path, struct lxc_conf *conf) |
f6d3e3e4 | 3377 | { |
7b50c609 TS |
3378 | uid_t rootuid; |
3379 | gid_t rootgid; | |
c4d10a05 | 3380 | pid_t pid; |
2a9a80cb | 3381 | unsigned long val; |
a7ef8753 | 3382 | char *chownpath = path; |
f6d3e3e4 | 3383 | |
2a9a80cb | 3384 | if (!get_mapped_rootid(conf, ID_TYPE_UID, &val)) { |
c4d10a05 SH |
3385 | ERROR("No mapping for container root"); |
3386 | return -1; | |
f6d3e3e4 | 3387 | } |
7b50c609 TS |
3388 | rootuid = (uid_t) val; |
3389 | if (!get_mapped_rootid(conf, ID_TYPE_GID, &val)) { | |
3390 | ERROR("No mapping for container root"); | |
3391 | return -1; | |
3392 | } | |
3393 | rootgid = (gid_t) val; | |
2a9a80cb | 3394 | |
a7ef8753 SH |
3395 | /* |
3396 | * In case of overlay, we want only the writeable layer | |
3397 | * to be chowned | |
3398 | */ | |
1f92162d | 3399 | if (strncmp(path, "overlayfs:", 10) == 0 || strncmp(path, "aufs:", 5) == 0) { |
a7ef8753 SH |
3400 | chownpath = strchr(path, ':'); |
3401 | if (!chownpath) { | |
3402 | ERROR("Bad overlay path: %s", path); | |
3403 | return -1; | |
3404 | } | |
3405 | chownpath = strchr(chownpath+1, ':'); | |
3406 | if (!chownpath) { | |
3407 | ERROR("Bad overlay path: %s", path); | |
3408 | return -1; | |
3409 | } | |
3410 | chownpath++; | |
3411 | } | |
3412 | path = chownpath; | |
c4d10a05 | 3413 | if (geteuid() == 0) { |
7b50c609 | 3414 | if (chown(path, rootuid, rootgid) < 0) { |
c4d10a05 SH |
3415 | ERROR("Error chowning %s", path); |
3416 | return -1; | |
3417 | } | |
3418 | return 0; | |
3419 | } | |
f3d7e4ca | 3420 | |
7b50c609 | 3421 | if (rootuid == geteuid()) { |
f3d7e4ca SH |
3422 | // nothing to do |
3423 | INFO("%s: container root is our uid; no need to chown" ,__func__); | |
3424 | return 0; | |
3425 | } | |
3426 | ||
c4d10a05 SH |
3427 | pid = fork(); |
3428 | if (pid < 0) { | |
3429 | SYSERROR("Failed forking"); | |
f6d3e3e4 SH |
3430 | return -1; |
3431 | } | |
c4d10a05 | 3432 | if (!pid) { |
7b50c609 TS |
3433 | int hostuid = geteuid(), hostgid = getegid(), ret; |
3434 | struct stat sb; | |
3435 | char map1[100], map2[100], map3[100], map4[100], map5[100]; | |
3436 | char ugid[100]; | |
3437 | char *args1[] = { "lxc-usernsexec", "-m", map1, "-m", map2, | |
3438 | "-m", map3, "-m", map5, | |
3439 | "--", "chown", ugid, path, NULL }; | |
3440 | char *args2[] = { "lxc-usernsexec", "-m", map1, "-m", map2, | |
3441 | "-m", map3, "-m", map4, "-m", map5, | |
3442 | "--", "chown", ugid, path, NULL }; | |
3443 | ||
3444 | // save the current gid of "path" | |
3445 | if (stat(path, &sb) < 0) { | |
3446 | ERROR("Error stat %s", path); | |
3447 | return -1; | |
3448 | } | |
f6d3e3e4 | 3449 | |
9a7c2aba SH |
3450 | /* |
3451 | * A file has to be group-owned by a gid mapped into the | |
3452 | * container, or the container won't be privileged over it. | |
3453 | */ | |
3454 | if (sb.st_uid == geteuid() && | |
3455 | mapped_hostid(sb.st_gid, conf, ID_TYPE_GID) < 0 && | |
3456 | chown(path, -1, hostgid) < 0) { | |
3457 | ERROR("Failed chgrping %s", path); | |
7b50c609 TS |
3458 | return -1; |
3459 | } | |
3460 | ||
3461 | // "u:0:rootuid:1" | |
3462 | ret = snprintf(map1, 100, "u:0:%d:1", rootuid); | |
c4d10a05 SH |
3463 | if (ret < 0 || ret >= 100) { |
3464 | ERROR("Error uid printing map string"); | |
f6d3e3e4 SH |
3465 | return -1; |
3466 | } | |
c4d10a05 | 3467 | |
98e5ba51 SH |
3468 | // "u:hostuid:hostuid:1" |
3469 | ret = snprintf(map2, 100, "u:%d:%d:1", hostuid, hostuid); | |
3470 | if (ret < 0 || ret >= 100) { | |
3471 | ERROR("Error uid printing map string"); | |
3472 | return -1; | |
3473 | } | |
3474 | ||
7b50c609 TS |
3475 | // "g:0:rootgid:1" |
3476 | ret = snprintf(map3, 100, "g:0:%d:1", rootgid); | |
c4d10a05 | 3477 | if (ret < 0 || ret >= 100) { |
7b50c609 | 3478 | ERROR("Error gid printing map string"); |
c4d10a05 SH |
3479 | return -1; |
3480 | } | |
3481 | ||
7b50c609 | 3482 | // "g:pathgid:rootgid+pathgid:1" |
b4c1e35d SG |
3483 | ret = snprintf(map4, 100, "g:%d:%d:1", (gid_t)sb.st_gid, |
3484 | rootgid + (gid_t)sb.st_gid); | |
7b50c609 TS |
3485 | if (ret < 0 || ret >= 100) { |
3486 | ERROR("Error gid printing map string"); | |
3487 | return -1; | |
3488 | } | |
3489 | ||
3490 | // "g:hostgid:hostgid:1" | |
3491 | ret = snprintf(map5, 100, "g:%d:%d:1", hostgid, hostgid); | |
3492 | if (ret < 0 || ret >= 100) { | |
3493 | ERROR("Error gid printing map string"); | |
3494 | return -1; | |
3495 | } | |
3496 | ||
3497 | // "0:pathgid" (chown) | |
b4c1e35d | 3498 | ret = snprintf(ugid, 100, "0:%d", (gid_t)sb.st_gid); |
7b50c609 TS |
3499 | if (ret < 0 || ret >= 100) { |
3500 | ERROR("Error owner printing format string for chown"); | |
3501 | return -1; | |
3502 | } | |
3503 | ||
3504 | if (hostgid == sb.st_gid) | |
3505 | ret = execvp("lxc-usernsexec", args1); | |
3506 | else | |
3507 | ret = execvp("lxc-usernsexec", args2); | |
c4d10a05 SH |
3508 | SYSERROR("Failed executing usernsexec"); |
3509 | exit(1); | |
f6d3e3e4 | 3510 | } |
c4d10a05 | 3511 | return wait_for_pid(pid); |
f6d3e3e4 SH |
3512 | } |
3513 | ||
c4d10a05 | 3514 | int ttys_shift_ids(struct lxc_conf *c) |
f6d3e3e4 | 3515 | { |
c4d10a05 | 3516 | int i; |
f6d3e3e4 | 3517 | |
c4d10a05 | 3518 | if (lxc_list_empty(&c->id_map)) |
f6d3e3e4 | 3519 | return 0; |
c4d10a05 SH |
3520 | |
3521 | for (i = 0; i < c->tty_info.nbtty; i++) { | |
3522 | struct lxc_pty_info *pty_info = &c->tty_info.pty_info[i]; | |
3523 | ||
3524 | if (chown_mapped_root(pty_info->name, c) < 0) { | |
3525 | ERROR("Failed to chown %s", pty_info->name); | |
f6d3e3e4 SH |
3526 | return -1; |
3527 | } | |
3528 | } | |
3529 | ||
29b10e4f | 3530 | if (strcmp(c->console.name, "") !=0 && chown_mapped_root(c->console.name, c) < 0) { |
c4d10a05 SH |
3531 | ERROR("Failed to chown %s", c->console.name); |
3532 | return -1; | |
3533 | } | |
3534 | ||
f6d3e3e4 SH |
3535 | return 0; |
3536 | } | |
3537 | ||
5112cd70 SH |
3538 | /* |
3539 | * _do_tmp_proc_mount: Mount /proc inside container if not already | |
3540 | * mounted | |
3541 | * | |
3542 | * @rootfs : the rootfs where proc should be mounted | |
3543 | * | |
3544 | * Returns < 0 on failure, 0 if the correct proc was already mounted | |
3545 | * and 1 if a new proc was mounted. | |
3546 | */ | |
3547 | static int do_tmp_proc_mount(const char *rootfs) | |
3548 | { | |
3549 | char path[MAXPATHLEN]; | |
3550 | char link[20]; | |
3551 | int linklen, ret; | |
3552 | ||
3553 | ret = snprintf(path, MAXPATHLEN, "%s/proc/self", rootfs); | |
3554 | if (ret < 0 || ret >= MAXPATHLEN) { | |
3555 | SYSERROR("proc path name too long"); | |
3556 | return -1; | |
3557 | } | |
3558 | memset(link, 0, 20); | |
3559 | linklen = readlink(path, link, 20); | |
3560 | INFO("I am %d, /proc/self points to '%s'", getpid(), link); | |
3561 | ret = snprintf(path, MAXPATHLEN, "%s/proc", rootfs); | |
3562 | if (linklen < 0) /* /proc not mounted */ | |
3563 | goto domount; | |
3564 | /* can't be longer than rootfs/proc/1 */ | |
3565 | if (strncmp(link, "1", linklen) != 0) { | |
3566 | /* wrong /procs mounted */ | |
3567 | umount2(path, MNT_DETACH); /* ignore failure */ | |
3568 | goto domount; | |
3569 | } | |
3570 | /* the right proc is already mounted */ | |
3571 | return 0; | |
3572 | ||
3573 | domount: | |
3574 | if (mount("proc", path, "proc", 0, NULL)) | |
3575 | return -1; | |
3576 | INFO("Mounted /proc in container for security transition"); | |
3577 | return 1; | |
3578 | } | |
3579 | ||
3580 | int tmp_proc_mount(struct lxc_conf *lxc_conf) | |
3581 | { | |
3582 | int mounted; | |
3583 | ||
3584 | if (lxc_conf->rootfs.path == NULL || strlen(lxc_conf->rootfs.path) == 0) { | |
3585 | if (mount("proc", "/proc", "proc", 0, NULL)) { | |
3586 | SYSERROR("Failed mounting /proc, proceeding"); | |
3587 | mounted = 0; | |
3588 | } else | |
3589 | mounted = 1; | |
3590 | } else | |
3591 | mounted = do_tmp_proc_mount(lxc_conf->rootfs.mount); | |
3592 | if (mounted == -1) { | |
3593 | SYSERROR("failed to mount /proc in the container."); | |
3594 | return -1; | |
3595 | } else if (mounted == 1) { | |
3596 | lxc_conf->tmp_umount_proc = 1; | |
3597 | } | |
3598 | return 0; | |
3599 | } | |
3600 | ||
3601 | void tmp_proc_unmount(struct lxc_conf *lxc_conf) | |
3602 | { | |
3603 | if (lxc_conf->tmp_umount_proc == 1) { | |
3604 | umount("/proc"); | |
3605 | lxc_conf->tmp_umount_proc = 0; | |
3606 | } | |
3607 | } | |
3608 | ||
6a0c909a | 3609 | void remount_all_slave(void) |
e995d7a2 SH |
3610 | { |
3611 | /* walk /proc/mounts and change any shared entries to slave */ | |
3612 | FILE *f = fopen("/proc/self/mountinfo", "r"); | |
3613 | char *line = NULL; | |
3614 | size_t len = 0; | |
3615 | ||
3616 | if (!f) { | |
3617 | SYSERROR("Failed to open /proc/self/mountinfo to mark all shared"); | |
3618 | ERROR("Continuing container startup..."); | |
3619 | return; | |
3620 | } | |
3621 | ||
3622 | while (getline(&line, &len, f) != -1) { | |
3623 | char *target, *opts; | |
3624 | target = get_field(line, 4); | |
3625 | if (!target) | |
3626 | continue; | |
3627 | opts = get_field(target, 2); | |
3628 | if (!opts) | |
3629 | continue; | |
3630 | null_endofword(opts); | |
3631 | if (!strstr(opts, "shared")) | |
3632 | continue; | |
3633 | null_endofword(target); | |
3634 | if (mount(NULL, target, NULL, MS_SLAVE, NULL)) { | |
3635 | SYSERROR("Failed to make %s rslave", target); | |
3636 | ERROR("Continuing..."); | |
3637 | } | |
3638 | } | |
3639 | fclose(f); | |
f10fad2f | 3640 | free(line); |
e995d7a2 SH |
3641 | } |
3642 | ||
2322903b SH |
3643 | void lxc_execute_bind_init(struct lxc_conf *conf) |
3644 | { | |
3645 | int ret; | |
9d9c111c SH |
3646 | char path[PATH_MAX], destpath[PATH_MAX], *p; |
3647 | ||
3648 | /* If init exists in the container, don't bind mount a static one */ | |
3649 | p = choose_init(conf->rootfs.mount); | |
3650 | if (p) { | |
3651 | free(p); | |
3652 | return; | |
3653 | } | |
2322903b SH |
3654 | |
3655 | ret = snprintf(path, PATH_MAX, SBINDIR "/init.lxc.static"); | |
3656 | if (ret < 0 || ret >= PATH_MAX) { | |
3657 | WARN("Path name too long searching for lxc.init.static"); | |
3658 | return; | |
3659 | } | |
3660 | ||
3661 | if (!file_exists(path)) { | |
3662 | INFO("%s does not exist on host", path); | |
3663 | return; | |
3664 | } | |
3665 | ||
3666 | ret = snprintf(destpath, PATH_MAX, "%s%s", conf->rootfs.mount, "/init.lxc.static"); | |
3667 | if (ret < 0 || ret >= PATH_MAX) { | |
3668 | WARN("Path name too long for container's lxc.init.static"); | |
3669 | return; | |
3670 | } | |
3671 | ||
3672 | if (!file_exists(destpath)) { | |
3673 | FILE * pathfile = fopen(destpath, "wb"); | |
3674 | if (!pathfile) { | |
3675 | SYSERROR("Failed to create mount target '%s'", destpath); | |
3676 | return; | |
3677 | } | |
3678 | fclose(pathfile); | |
3679 | } | |
3680 | ||
3681 | ret = mount(path, destpath, "none", MS_BIND, NULL); | |
3682 | if (ret < 0) | |
3683 | SYSERROR("Failed to bind lxc.init.static into container"); | |
3684 | INFO("lxc.init.static bound into container at %s", path); | |
3685 | } | |
3686 | ||
35120d9c SH |
3687 | /* |
3688 | * This does the work of remounting / if it is shared, calling the | |
3689 | * container pre-mount hooks, and mounting the rootfs. | |
3690 | */ | |
3691 | int do_rootfs_setup(struct lxc_conf *conf, const char *name, const char *lxcpath) | |
0ad19a3f | 3692 | { |
35120d9c SH |
3693 | if (conf->rootfs_setup) { |
3694 | /* | |
3695 | * rootfs was set up in another namespace. bind-mount it | |
3696 | * to give us a mount in our own ns so we can pivot_root to it | |
3697 | */ | |
3698 | const char *path = conf->rootfs.mount; | |
3699 | if (mount(path, path, "rootfs", MS_BIND, NULL) < 0) { | |
3700 | ERROR("Failed to bind-mount container / onto itself"); | |
145832ba | 3701 | return -1; |
35120d9c | 3702 | } |
145832ba | 3703 | return 0; |
35120d9c | 3704 | } |
d4ef7c50 | 3705 | |
e995d7a2 SH |
3706 | remount_all_slave(); |
3707 | ||
35120d9c SH |
3708 | if (run_lxc_hooks(name, "pre-mount", conf, lxcpath, NULL)) { |
3709 | ERROR("failed to run pre-mount hooks for container '%s'.", name); | |
3710 | return -1; | |
3711 | } | |
3712 | ||
3713 | if (setup_rootfs(conf)) { | |
3714 | ERROR("failed to setup rootfs for '%s'", name); | |
3715 | return -1; | |
3716 | } | |
3717 | ||
3718 | conf->rootfs_setup = true; | |
3719 | return 0; | |
3720 | } | |
3721 | ||
1c1c7051 SH |
3722 | static bool verify_start_hooks(struct lxc_conf *conf) |
3723 | { | |
3724 | struct lxc_list *it; | |
3725 | char path[MAXPATHLEN]; | |
3726 | lxc_list_for_each(it, &conf->hooks[LXCHOOK_START]) { | |
3727 | char *hookname = it->elem; | |
3728 | struct stat st; | |
3729 | int ret; | |
3730 | ||
3731 | ret = snprintf(path, MAXPATHLEN, "%s%s", | |
3732 | conf->rootfs.mount, hookname); | |
3733 | if (ret < 0 || ret >= MAXPATHLEN) | |
3734 | return false; | |
3735 | ret = stat(path, &st); | |
3736 | if (ret) { | |
3737 | SYSERROR("Start hook %s not found in container rootfs", | |
3738 | hookname); | |
3739 | return false; | |
3740 | } | |
6a0c909a | 3741 | return true; |
1c1c7051 SH |
3742 | } |
3743 | ||
3744 | return true; | |
3745 | } | |
3746 | ||
35120d9c SH |
3747 | int lxc_setup(struct lxc_handler *handler) |
3748 | { | |
3749 | const char *name = handler->name; | |
3750 | struct lxc_conf *lxc_conf = handler->conf; | |
3751 | const char *lxcpath = handler->lxcpath; | |
35120d9c SH |
3752 | |
3753 | if (do_rootfs_setup(lxc_conf, name, lxcpath) < 0) { | |
3754 | ERROR("Error setting up rootfs mount after spawn"); | |
3755 | return -1; | |
3756 | } | |
3757 | ||
6c544cb3 MM |
3758 | if (lxc_conf->inherit_ns_fd[LXC_NS_UTS] == -1) { |
3759 | if (setup_utsname(lxc_conf->utsname)) { | |
3760 | ERROR("failed to setup the utsname for '%s'", name); | |
3761 | return -1; | |
3762 | } | |
0ad19a3f | 3763 | } |
3764 | ||
5f4535a3 | 3765 | if (setup_network(&lxc_conf->network)) { |
36eb9bde | 3766 | ERROR("failed to setup the network for '%s'", name); |
95b5ffaf | 3767 | return -1; |
0ad19a3f | 3768 | } |
3769 | ||
bc6928ff MW |
3770 | if (lxc_conf->autodev > 0) { |
3771 | if (mount_autodev(name, lxc_conf->rootfs.mount, lxcpath)) { | |
91c3830e | 3772 | ERROR("failed to mount /dev in the container"); |
c6883f38 SH |
3773 | return -1; |
3774 | } | |
3775 | } | |
3776 | ||
368bbc02 CS |
3777 | /* do automatic mounts (mainly /proc and /sys), but exclude |
3778 | * those that need to wait until other stuff has finished | |
3779 | */ | |
4fb3cba5 | 3780 | if (lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & ~LXC_AUTO_CGROUP_MASK, handler) < 0) { |
368bbc02 CS |
3781 | ERROR("failed to setup the automatic mounts for '%s'", name); |
3782 | return -1; | |
3783 | } | |
3784 | ||
80a881b2 | 3785 | if (setup_mount(&lxc_conf->rootfs, lxc_conf->fstab, name)) { |
36eb9bde | 3786 | ERROR("failed to setup the mounts for '%s'", name); |
95b5ffaf | 3787 | return -1; |
576f946d | 3788 | } |
3789 | ||
c1dc38c2 | 3790 | if (!lxc_list_empty(&lxc_conf->mount_list) && setup_mount_entries(&lxc_conf->rootfs, &lxc_conf->mount_list, name)) { |
e7938e9e MN |
3791 | ERROR("failed to setup the mount entries for '%s'", name); |
3792 | return -1; | |
3793 | } | |
3794 | ||
1c1c7051 SH |
3795 | /* Make sure any start hooks are in the rootfs */ |
3796 | if (!verify_start_hooks(lxc_conf)) | |
3797 | return -1; | |
3798 | ||
2322903b SH |
3799 | if (lxc_conf->is_execute) |
3800 | lxc_execute_bind_init(lxc_conf); | |
3801 | ||
368bbc02 CS |
3802 | /* now mount only cgroup, if wanted; |
3803 | * before, /sys could not have been mounted | |
3804 | * (is either mounted automatically or via fstab entries) | |
3805 | */ | |
4fb3cba5 | 3806 | if (lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & LXC_AUTO_CGROUP_MASK, handler) < 0) { |
368bbc02 CS |
3807 | ERROR("failed to setup the automatic mounts for '%s'", name); |
3808 | return -1; | |
3809 | } | |
3810 | ||
283678ed | 3811 | if (run_lxc_hooks(name, "mount", lxc_conf, lxcpath, NULL)) { |
773fb9ca SH |
3812 | ERROR("failed to run mount hooks for container '%s'.", name); |
3813 | return -1; | |
3814 | } | |
3815 | ||
bc6928ff | 3816 | if (lxc_conf->autodev > 0) { |
283678ed | 3817 | if (run_lxc_hooks(name, "autodev", lxc_conf, lxcpath, NULL)) { |
f7bee6c6 MW |
3818 | ERROR("failed to run autodev hooks for container '%s'.", name); |
3819 | return -1; | |
3820 | } | |
9cb4d183 | 3821 | if (fill_autodev(lxc_conf->rootfs.mount)) { |
91c3830e SH |
3822 | ERROR("failed to populate /dev in the container"); |
3823 | return -1; | |
3824 | } | |
3825 | } | |
368bbc02 | 3826 | |
37903589 | 3827 | if (!lxc_conf->is_execute && setup_console(&lxc_conf->rootfs, &lxc_conf->console, lxc_conf->ttydir)) { |
36eb9bde | 3828 | ERROR("failed to setup the console for '%s'", name); |
95b5ffaf | 3829 | return -1; |
6e590161 | 3830 | } |
3831 | ||
7e0e1d94 AV |
3832 | if (lxc_conf->kmsg) { |
3833 | if (setup_kmsg(&lxc_conf->rootfs, &lxc_conf->console)) // don't fail | |
3834 | ERROR("failed to setup kmsg for '%s'", name); | |
3835 | } | |
1bd051a6 | 3836 | |
393903d1 | 3837 | if (!lxc_conf->is_execute && setup_tty(lxc_conf)) { |
36eb9bde | 3838 | ERROR("failed to setup the ttys for '%s'", name); |
95b5ffaf | 3839 | return -1; |
b0a33c1e | 3840 | } |
3841 | ||
393903d1 SH |
3842 | if (lxc_conf->pty_names && setenv("container_ttys", lxc_conf->pty_names, 1)) |
3843 | SYSERROR("failed to set environment variable for container ptys"); | |
3844 | ||
69aa6655 DE |
3845 | if (!lxc_conf->is_execute && setup_dev_symlinks(&lxc_conf->rootfs)) { |
3846 | ERROR("failed to setup /dev symlinks for '%s'", name); | |
3847 | return -1; | |
3848 | } | |
3849 | ||
5112cd70 SH |
3850 | /* mount /proc if it's not already there */ |
3851 | if (tmp_proc_mount(lxc_conf) < 0) { | |
fe4de9a6 | 3852 | ERROR("failed to LSM mount proc for '%s'", name); |
e075f5d9 | 3853 | return -1; |
e075f5d9 | 3854 | } |
e075f5d9 | 3855 | |
ac778708 | 3856 | if (setup_pivot_root(&lxc_conf->rootfs)) { |
36eb9bde | 3857 | ERROR("failed to set rootfs for '%s'", name); |
95b5ffaf | 3858 | return -1; |
ed502555 | 3859 | } |
3860 | ||
571e6ec8 | 3861 | if (setup_pts(lxc_conf->pts)) { |
36eb9bde | 3862 | ERROR("failed to setup the new pts instance"); |
95b5ffaf | 3863 | return -1; |
3c26f34e | 3864 | } |
3865 | ||
cccc74b5 DL |
3866 | if (setup_personality(lxc_conf->personality)) { |
3867 | ERROR("failed to setup personality"); | |
3868 | return -1; | |
3869 | } | |
3870 | ||
97a8f74f SG |
3871 | if (!lxc_list_empty(&lxc_conf->keepcaps)) { |
3872 | if (!lxc_list_empty(&lxc_conf->caps)) { | |
3873 | ERROR("Simultaneously requested dropping and keeping caps"); | |
f6d3e3e4 SH |
3874 | return -1; |
3875 | } | |
97a8f74f SG |
3876 | if (dropcaps_except(&lxc_conf->keepcaps)) { |
3877 | ERROR("failed to keep requested caps"); | |
3878 | return -1; | |
3879 | } | |
3880 | } else if (setup_caps(&lxc_conf->caps)) { | |
3881 | ERROR("failed to drop capabilities"); | |
3882 | return -1; | |
81810dd1 DL |
3883 | } |
3884 | ||
cd54d859 DL |
3885 | NOTICE("'%s' is setup.", name); |
3886 | ||
0ad19a3f | 3887 | return 0; |
3888 | } | |
26ddeedd | 3889 | |
283678ed SH |
3890 | int run_lxc_hooks(const char *name, char *hook, struct lxc_conf *conf, |
3891 | const char *lxcpath, char *argv[]) | |
26ddeedd SH |
3892 | { |
3893 | int which = -1; | |
3894 | struct lxc_list *it; | |
3895 | ||
3896 | if (strcmp(hook, "pre-start") == 0) | |
3897 | which = LXCHOOK_PRESTART; | |
5ea6163a SH |
3898 | else if (strcmp(hook, "pre-mount") == 0) |
3899 | which = LXCHOOK_PREMOUNT; | |
26ddeedd SH |
3900 | else if (strcmp(hook, "mount") == 0) |
3901 | which = LXCHOOK_MOUNT; | |
f7bee6c6 MW |
3902 | else if (strcmp(hook, "autodev") == 0) |
3903 | which = LXCHOOK_AUTODEV; | |
26ddeedd SH |
3904 | else if (strcmp(hook, "start") == 0) |
3905 | which = LXCHOOK_START; | |
3906 | else if (strcmp(hook, "post-stop") == 0) | |
3907 | which = LXCHOOK_POSTSTOP; | |
148e91f5 SH |
3908 | else if (strcmp(hook, "clone") == 0) |
3909 | which = LXCHOOK_CLONE; | |
26ddeedd SH |
3910 | else |
3911 | return -1; | |
3912 | lxc_list_for_each(it, &conf->hooks[which]) { | |
3913 | int ret; | |
3914 | char *hookname = it->elem; | |
283678ed | 3915 | ret = run_script_argv(name, "lxc", hookname, hook, lxcpath, argv); |
26ddeedd SH |
3916 | if (ret) |
3917 | return ret; | |
3918 | } | |
3919 | return 0; | |
3920 | } | |
72d0e1cb | 3921 | |
427b3a21 | 3922 | static void lxc_remove_nic(struct lxc_list *it) |
72d0e1cb SG |
3923 | { |
3924 | struct lxc_netdev *netdev = it->elem; | |
9ebb03ad | 3925 | struct lxc_list *it2,*next; |
72d0e1cb SG |
3926 | |
3927 | lxc_list_del(it); | |
3928 | ||
f10fad2f ME |
3929 | free(netdev->link); |
3930 | free(netdev->name); | |
3931 | if (netdev->type == LXC_NET_VETH) | |
c9bb9a85 | 3932 | free(netdev->priv.veth_attr.pair); |
f10fad2f ME |
3933 | free(netdev->upscript); |
3934 | free(netdev->hwaddr); | |
3935 | free(netdev->mtu); | |
3936 | free(netdev->ipv4_gateway); | |
3937 | free(netdev->ipv6_gateway); | |
9ebb03ad | 3938 | lxc_list_for_each_safe(it2, &netdev->ipv4, next) { |
72d0e1cb SG |
3939 | lxc_list_del(it2); |
3940 | free(it2->elem); | |
3941 | free(it2); | |
3942 | } | |
9ebb03ad | 3943 | lxc_list_for_each_safe(it2, &netdev->ipv6, next) { |
72d0e1cb SG |
3944 | lxc_list_del(it2); |
3945 | free(it2->elem); | |
3946 | free(it2); | |
3947 | } | |
d95db067 | 3948 | free(netdev); |
72d0e1cb SG |
3949 | free(it); |
3950 | } | |
3951 | ||
3952 | /* we get passed in something like '0', '0.ipv4' or '1.ipv6' */ | |
12a50cc6 | 3953 | int lxc_clear_nic(struct lxc_conf *c, const char *key) |
72d0e1cb SG |
3954 | { |
3955 | char *p1; | |
3956 | int ret, idx, i; | |
3957 | struct lxc_list *it; | |
3958 | struct lxc_netdev *netdev; | |
3959 | ||
46cd2845 | 3960 | p1 = strchr(key, '.'); |
72d0e1cb SG |
3961 | if (!p1 || *(p1+1) == '\0') |
3962 | p1 = NULL; | |
3963 | ||
3964 | ret = sscanf(key, "%d", &idx); | |
3965 | if (ret != 1) return -1; | |
3966 | if (idx < 0) | |
3967 | return -1; | |
3968 | ||
3969 | i = 0; | |
3970 | lxc_list_for_each(it, &c->network) { | |
3971 | if (i == idx) | |
3972 | break; | |
3973 | i++; | |
3974 | } | |
3975 | if (i < idx) // we don't have that many nics defined | |
3976 | return -1; | |
3977 | ||
3978 | if (!it || !it->elem) | |
3979 | return -1; | |
3980 | ||
3981 | netdev = it->elem; | |
3982 | ||
3983 | if (!p1) { | |
3984 | lxc_remove_nic(it); | |
52d21d40 | 3985 | } else if (strcmp(p1, ".ipv4") == 0) { |
9ebb03ad DE |
3986 | struct lxc_list *it2,*next; |
3987 | lxc_list_for_each_safe(it2, &netdev->ipv4, next) { | |
72d0e1cb SG |
3988 | lxc_list_del(it2); |
3989 | free(it2->elem); | |
3990 | free(it2); | |
3991 | } | |
52d21d40 | 3992 | } else if (strcmp(p1, ".ipv6") == 0) { |
9ebb03ad DE |
3993 | struct lxc_list *it2,*next; |
3994 | lxc_list_for_each_safe(it2, &netdev->ipv6, next) { | |
72d0e1cb SG |
3995 | lxc_list_del(it2); |
3996 | free(it2->elem); | |
3997 | free(it2); | |
3998 | } | |
72d0e1cb SG |
3999 | } |
4000 | else return -1; | |
4001 | ||
4002 | return 0; | |
4003 | } | |
4004 | ||
4005 | int lxc_clear_config_network(struct lxc_conf *c) | |
4006 | { | |
9ebb03ad DE |
4007 | struct lxc_list *it,*next; |
4008 | lxc_list_for_each_safe(it, &c->network, next) { | |
72d0e1cb SG |
4009 | lxc_remove_nic(it); |
4010 | } | |
4011 | return 0; | |
4012 | } | |
4013 | ||
4014 | int lxc_clear_config_caps(struct lxc_conf *c) | |
4015 | { | |
9ebb03ad | 4016 | struct lxc_list *it,*next; |
72d0e1cb | 4017 | |
9ebb03ad | 4018 | lxc_list_for_each_safe(it, &c->caps, next) { |
72d0e1cb SG |
4019 | lxc_list_del(it); |
4020 | free(it->elem); | |
4021 | free(it); | |
4022 | } | |
4023 | return 0; | |
4024 | } | |
4025 | ||
74a3920a | 4026 | static int lxc_free_idmap(struct lxc_list *id_map) { |
27c27d73 SH |
4027 | struct lxc_list *it, *next; |
4028 | ||
4355ab5f | 4029 | lxc_list_for_each_safe(it, id_map, next) { |
27c27d73 SH |
4030 | lxc_list_del(it); |
4031 | free(it->elem); | |
4032 | free(it); | |
4033 | } | |
4034 | return 0; | |
4035 | } | |
4036 | ||
4355ab5f SH |
4037 | int lxc_clear_idmaps(struct lxc_conf *c) |
4038 | { | |
4039 | return lxc_free_idmap(&c->id_map); | |
4040 | } | |
4041 | ||
1fb86a7c SH |
4042 | int lxc_clear_config_keepcaps(struct lxc_conf *c) |
4043 | { | |
4044 | struct lxc_list *it,*next; | |
4045 | ||
4046 | lxc_list_for_each_safe(it, &c->keepcaps, next) { | |
4047 | lxc_list_del(it); | |
4048 | free(it->elem); | |
4049 | free(it); | |
4050 | } | |
4051 | return 0; | |
4052 | } | |
4053 | ||
12a50cc6 | 4054 | int lxc_clear_cgroups(struct lxc_conf *c, const char *key) |
72d0e1cb | 4055 | { |
9ebb03ad | 4056 | struct lxc_list *it,*next; |
72d0e1cb | 4057 | bool all = false; |
12a50cc6 | 4058 | const char *k = key + 11; |
72d0e1cb SG |
4059 | |
4060 | if (strcmp(key, "lxc.cgroup") == 0) | |
4061 | all = true; | |
4062 | ||
9ebb03ad | 4063 | lxc_list_for_each_safe(it, &c->cgroup, next) { |
72d0e1cb SG |
4064 | struct lxc_cgroup *cg = it->elem; |
4065 | if (!all && strcmp(cg->subsystem, k) != 0) | |
4066 | continue; | |
4067 | lxc_list_del(it); | |
4068 | free(cg->subsystem); | |
4069 | free(cg->value); | |
4070 | free(cg); | |
4071 | free(it); | |
4072 | } | |
4073 | return 0; | |
4074 | } | |
4075 | ||
ee1e7aa0 SG |
4076 | int lxc_clear_groups(struct lxc_conf *c) |
4077 | { | |
4078 | struct lxc_list *it,*next; | |
4079 | ||
4080 | lxc_list_for_each_safe(it, &c->groups, next) { | |
4081 | lxc_list_del(it); | |
4082 | free(it->elem); | |
4083 | free(it); | |
4084 | } | |
4085 | return 0; | |
4086 | } | |
4087 | ||
ab799c0b SG |
4088 | int lxc_clear_environment(struct lxc_conf *c) |
4089 | { | |
4090 | struct lxc_list *it,*next; | |
4091 | ||
4092 | lxc_list_for_each_safe(it, &c->environment, next) { | |
4093 | lxc_list_del(it); | |
4094 | free(it->elem); | |
4095 | free(it); | |
4096 | } | |
4097 | return 0; | |
4098 | } | |
4099 | ||
4100 | ||
72d0e1cb SG |
4101 | int lxc_clear_mount_entries(struct lxc_conf *c) |
4102 | { | |
9ebb03ad | 4103 | struct lxc_list *it,*next; |
72d0e1cb | 4104 | |
9ebb03ad | 4105 | lxc_list_for_each_safe(it, &c->mount_list, next) { |
72d0e1cb SG |
4106 | lxc_list_del(it); |
4107 | free(it->elem); | |
4108 | free(it); | |
4109 | } | |
4110 | return 0; | |
4111 | } | |
4112 | ||
b099e9e9 SH |
4113 | int lxc_clear_automounts(struct lxc_conf *c) |
4114 | { | |
4115 | c->auto_mounts = 0; | |
4116 | return 0; | |
4117 | } | |
4118 | ||
12a50cc6 | 4119 | int lxc_clear_hooks(struct lxc_conf *c, const char *key) |
72d0e1cb | 4120 | { |
9ebb03ad | 4121 | struct lxc_list *it,*next; |
17ed13a3 | 4122 | bool all = false, done = false; |
12a50cc6 | 4123 | const char *k = key + 9; |
72d0e1cb SG |
4124 | int i; |
4125 | ||
17ed13a3 SH |
4126 | if (strcmp(key, "lxc.hook") == 0) |
4127 | all = true; | |
4128 | ||
72d0e1cb | 4129 | for (i=0; i<NUM_LXC_HOOKS; i++) { |
17ed13a3 | 4130 | if (all || strcmp(k, lxchook_names[i]) == 0) { |
9ebb03ad | 4131 | lxc_list_for_each_safe(it, &c->hooks[i], next) { |
17ed13a3 SH |
4132 | lxc_list_del(it); |
4133 | free(it->elem); | |
4134 | free(it); | |
4135 | } | |
4136 | done = true; | |
72d0e1cb SG |
4137 | } |
4138 | } | |
17ed13a3 SH |
4139 | |
4140 | if (!done) { | |
4141 | ERROR("Invalid hook key: %s", key); | |
4142 | return -1; | |
4143 | } | |
72d0e1cb SG |
4144 | return 0; |
4145 | } | |
8eb5694b | 4146 | |
74a3920a | 4147 | static void lxc_clear_saved_nics(struct lxc_conf *conf) |
7b35f3d6 SH |
4148 | { |
4149 | int i; | |
4150 | ||
0cf45501 | 4151 | if (!conf->saved_nics) |
7b35f3d6 SH |
4152 | return; |
4153 | for (i=0; i < conf->num_savednics; i++) | |
4154 | free(conf->saved_nics[i].orig_name); | |
7b35f3d6 SH |
4155 | free(conf->saved_nics); |
4156 | } | |
4157 | ||
4184c3e1 SH |
4158 | static inline void lxc_clear_aliens(struct lxc_conf *conf) |
4159 | { | |
4160 | struct lxc_list *it,*next; | |
4161 | ||
4162 | lxc_list_for_each_safe(it, &conf->aliens, next) { | |
4163 | lxc_list_del(it); | |
4164 | free(it->elem); | |
4165 | free(it); | |
4166 | } | |
4167 | } | |
4168 | ||
f979ac15 SH |
4169 | static inline void lxc_clear_includes(struct lxc_conf *conf) |
4170 | { | |
4171 | struct lxc_list *it,*next; | |
4172 | ||
4173 | lxc_list_for_each_safe(it, &conf->includes, next) { | |
4174 | lxc_list_del(it); | |
4175 | free(it->elem); | |
4176 | free(it); | |
4177 | } | |
4178 | } | |
4179 | ||
8eb5694b SH |
4180 | void lxc_conf_free(struct lxc_conf *conf) |
4181 | { | |
4182 | if (!conf) | |
4183 | return; | |
f10fad2f ME |
4184 | free(conf->console.log_path); |
4185 | free(conf->console.path); | |
4186 | free(conf->rootfs.mount); | |
4187 | free(conf->rootfs.options); | |
4188 | free(conf->rootfs.path); | |
4189 | free(conf->rootfs.pivot); | |
4190 | free(conf->logfile); | |
4191 | free(conf->utsname); | |
4192 | free(conf->ttydir); | |
4193 | free(conf->fstab); | |
4194 | free(conf->rcfile); | |
4195 | free(conf->init_cmd); | |
6b0d5538 | 4196 | free(conf->unexpanded_config); |
393903d1 | 4197 | free(conf->pty_names); |
8eb5694b | 4198 | lxc_clear_config_network(conf); |
f10fad2f ME |
4199 | free(conf->lsm_aa_profile); |
4200 | free(conf->lsm_se_context); | |
769872f9 | 4201 | lxc_seccomp_free(conf); |
8eb5694b | 4202 | lxc_clear_config_caps(conf); |
1fb86a7c | 4203 | lxc_clear_config_keepcaps(conf); |
8eb5694b | 4204 | lxc_clear_cgroups(conf, "lxc.cgroup"); |
17ed13a3 | 4205 | lxc_clear_hooks(conf, "lxc.hook"); |
8eb5694b | 4206 | lxc_clear_mount_entries(conf); |
7b35f3d6 | 4207 | lxc_clear_saved_nics(conf); |
27c27d73 | 4208 | lxc_clear_idmaps(conf); |
ee1e7aa0 | 4209 | lxc_clear_groups(conf); |
f979ac15 | 4210 | lxc_clear_includes(conf); |
761d81ca | 4211 | lxc_clear_aliens(conf); |
ab799c0b | 4212 | lxc_clear_environment(conf); |
8eb5694b SH |
4213 | free(conf); |
4214 | } | |
4355ab5f SH |
4215 | |
4216 | struct userns_fn_data { | |
4217 | int (*fn)(void *); | |
4218 | void *arg; | |
4219 | int p[2]; | |
4220 | }; | |
4221 | ||
4222 | static int run_userns_fn(void *data) | |
4223 | { | |
4224 | struct userns_fn_data *d = data; | |
4225 | char c; | |
4226 | // we're not sharing with the parent any more, if it was a thread | |
4227 | ||
4228 | close(d->p[1]); | |
4229 | if (read(d->p[0], &c, 1) != 1) | |
4230 | return -1; | |
4231 | close(d->p[0]); | |
4232 | return d->fn(d->arg); | |
4233 | } | |
4234 | ||
4235 | /* | |
8b227008 TS |
4236 | * Add ID_TYPE_UID/ID_TYPE_GID entries to an existing lxc_conf, |
4237 | * if they are not already there. | |
4355ab5f | 4238 | */ |
8b227008 TS |
4239 | static struct lxc_list *idmap_add_id(struct lxc_conf *conf, |
4240 | uid_t uid, gid_t gid) | |
4355ab5f | 4241 | { |
8b227008 TS |
4242 | int hostuid_mapped = mapped_hostid(uid, conf, ID_TYPE_UID); |
4243 | int hostgid_mapped = mapped_hostid(gid, conf, ID_TYPE_GID); | |
4355ab5f SH |
4244 | struct lxc_list *new = NULL, *tmp, *it, *next; |
4245 | struct id_map *entry; | |
4246 | ||
3ec1648d SH |
4247 | new = malloc(sizeof(*new)); |
4248 | if (!new) { | |
4249 | ERROR("Out of memory building id map"); | |
4250 | return NULL; | |
4251 | } | |
4252 | lxc_list_init(new); | |
4253 | ||
8b227008 TS |
4254 | if (hostuid_mapped < 0) { |
4255 | hostuid_mapped = find_unmapped_nsuid(conf, ID_TYPE_UID); | |
4256 | if (hostuid_mapped < 0) | |
3ec1648d SH |
4257 | goto err; |
4258 | tmp = malloc(sizeof(*tmp)); | |
4259 | if (!tmp) | |
4260 | goto err; | |
4355ab5f SH |
4261 | entry = malloc(sizeof(*entry)); |
4262 | if (!entry) { | |
3ec1648d SH |
4263 | free(tmp); |
4264 | goto err; | |
4355ab5f | 4265 | } |
3ec1648d | 4266 | tmp->elem = entry; |
4355ab5f | 4267 | entry->idtype = ID_TYPE_UID; |
8b227008 TS |
4268 | entry->nsid = hostuid_mapped; |
4269 | entry->hostid = (unsigned long) uid; | |
4270 | entry->range = 1; | |
4271 | lxc_list_add_tail(new, tmp); | |
4272 | } | |
4273 | if (hostgid_mapped < 0) { | |
4274 | hostgid_mapped = find_unmapped_nsuid(conf, ID_TYPE_GID); | |
4275 | if (hostgid_mapped < 0) | |
4276 | goto err; | |
4277 | tmp = malloc(sizeof(*tmp)); | |
4278 | if (!tmp) | |
4279 | goto err; | |
4280 | entry = malloc(sizeof(*entry)); | |
4281 | if (!entry) { | |
4282 | free(tmp); | |
4283 | goto err; | |
4284 | } | |
4285 | tmp->elem = entry; | |
4286 | entry->idtype = ID_TYPE_GID; | |
4287 | entry->nsid = hostgid_mapped; | |
4288 | entry->hostid = (unsigned long) gid; | |
4355ab5f | 4289 | entry->range = 1; |
3ec1648d | 4290 | lxc_list_add_tail(new, tmp); |
4355ab5f SH |
4291 | } |
4292 | lxc_list_for_each_safe(it, &conf->id_map, next) { | |
4293 | tmp = malloc(sizeof(*tmp)); | |
4294 | if (!tmp) | |
4295 | goto err; | |
4296 | entry = malloc(sizeof(*entry)); | |
4297 | if (!entry) { | |
4298 | free(tmp); | |
4299 | goto err; | |
4300 | } | |
4301 | memset(entry, 0, sizeof(*entry)); | |
4302 | memcpy(entry, it->elem, sizeof(*entry)); | |
4303 | tmp->elem = entry; | |
3ec1648d | 4304 | lxc_list_add_tail(new, tmp); |
4355ab5f SH |
4305 | } |
4306 | ||
4307 | return new; | |
4308 | ||
4309 | err: | |
8b227008 | 4310 | ERROR("Out of memory building a new uid/gid map"); |
908fde6a SH |
4311 | if (new) |
4312 | lxc_free_idmap(new); | |
c30ac545 | 4313 | free(new); |
4355ab5f SH |
4314 | return NULL; |
4315 | } | |
4316 | ||
4317 | /* | |
4318 | * Run a function in a new user namespace. | |
8b227008 | 4319 | * The caller's euid/egid will be mapped in if it is not already. |
4355ab5f SH |
4320 | */ |
4321 | int userns_exec_1(struct lxc_conf *conf, int (*fn)(void *), void *data) | |
4322 | { | |
4323 | int ret, pid; | |
4324 | struct userns_fn_data d; | |
4325 | char c = '1'; | |
4326 | int p[2]; | |
4327 | struct lxc_list *idmap; | |
4328 | ||
4355ab5f | 4329 | ret = pipe(p); |
4355ab5f SH |
4330 | if (ret < 0) { |
4331 | SYSERROR("opening pipe"); | |
4332 | return -1; | |
4333 | } | |
4334 | d.fn = fn; | |
4335 | d.arg = data; | |
4336 | d.p[0] = p[0]; | |
4337 | d.p[1] = p[1]; | |
4338 | pid = lxc_clone(run_userns_fn, &d, CLONE_NEWUSER); | |
4339 | if (pid < 0) | |
4340 | goto err; | |
4355ab5f | 4341 | close(p[0]); |
4355ab5f SH |
4342 | p[0] = -1; |
4343 | ||
8b227008 TS |
4344 | if ((idmap = idmap_add_id(conf, geteuid(), getegid())) == NULL) { |
4345 | ERROR("Error adding self to container uid/gid map"); | |
4355ab5f SH |
4346 | goto err; |
4347 | } | |
4348 | ||
4349 | ret = lxc_map_ids(idmap, pid); | |
4350 | lxc_free_idmap(idmap); | |
88dd66fc | 4351 | free(idmap); |
565e571c | 4352 | if (ret) { |
4355ab5f SH |
4353 | ERROR("Error setting up child mappings"); |
4354 | goto err; | |
4355 | } | |
4356 | ||
4357 | // kick the child | |
4358 | if (write(p[1], &c, 1) != 1) { | |
4359 | SYSERROR("writing to pipe to child"); | |
4360 | goto err; | |
4361 | } | |
4362 | ||
3139aead SG |
4363 | ret = wait_for_pid(pid); |
4364 | ||
4365 | close(p[1]); | |
4366 | return ret; | |
4367 | ||
4355ab5f | 4368 | err: |
4355ab5f SH |
4369 | if (p[0] != -1) |
4370 | close(p[0]); | |
4371 | close(p[1]); | |
4355ab5f SH |
4372 | return -1; |
4373 | } | |
97e9cfa0 | 4374 | |
a96a8e8c | 4375 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4376 | static char* getuname(void) |
4377 | { | |
a96a8e8c | 4378 | struct passwd *result; |
97e9cfa0 | 4379 | |
a96a8e8c SH |
4380 | result = getpwuid(geteuid()); |
4381 | if (!result) | |
97e9cfa0 SH |
4382 | return NULL; |
4383 | ||
a96a8e8c | 4384 | return strdup(result->pw_name); |
97e9cfa0 SH |
4385 | } |
4386 | ||
a96a8e8c | 4387 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4388 | static char *getgname(void) |
4389 | { | |
a96a8e8c | 4390 | struct group *result; |
97e9cfa0 | 4391 | |
a96a8e8c SH |
4392 | result = getgrgid(getegid()); |
4393 | if (!result) | |
97e9cfa0 SH |
4394 | return NULL; |
4395 | ||
a96a8e8c | 4396 | return strdup(result->gr_name); |
97e9cfa0 SH |
4397 | } |
4398 | ||
a96a8e8c | 4399 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4400 | void suggest_default_idmap(void) |
4401 | { | |
4402 | FILE *f; | |
4403 | unsigned int uid = 0, urange = 0, gid = 0, grange = 0; | |
4404 | char *line = NULL; | |
4405 | char *uname, *gname; | |
4406 | size_t len = 0; | |
4407 | ||
4408 | if (!(uname = getuname())) | |
4409 | return; | |
4410 | ||
4411 | if (!(gname = getgname())) { | |
4412 | free(uname); | |
4413 | return; | |
4414 | } | |
4415 | ||
4416 | f = fopen(subuidfile, "r"); | |
4417 | if (!f) { | |
4418 | ERROR("Your system is not configured with subuids"); | |
4419 | free(gname); | |
4420 | free(uname); | |
4421 | return; | |
4422 | } | |
4423 | while (getline(&line, &len, f) != -1) { | |
4424 | char *p = strchr(line, ':'), *p2; | |
4425 | if (*line == '#') | |
4426 | continue; | |
4427 | if (!p) | |
4428 | continue; | |
4429 | *p = '\0'; | |
4430 | p++; | |
4431 | if (strcmp(line, uname)) | |
4432 | continue; | |
4433 | p2 = strchr(p, ':'); | |
4434 | if (!p2) | |
4435 | continue; | |
4436 | *p2 = '\0'; | |
4437 | p2++; | |
4438 | if (!*p2) | |
4439 | continue; | |
4440 | uid = atoi(p); | |
4441 | urange = atoi(p2); | |
4442 | } | |
4443 | fclose(f); | |
4444 | ||
4445 | f = fopen(subuidfile, "r"); | |
4446 | if (!f) { | |
4447 | ERROR("Your system is not configured with subgids"); | |
4448 | free(gname); | |
4449 | free(uname); | |
4450 | return; | |
4451 | } | |
4452 | while (getline(&line, &len, f) != -1) { | |
4453 | char *p = strchr(line, ':'), *p2; | |
4454 | if (*line == '#') | |
4455 | continue; | |
4456 | if (!p) | |
4457 | continue; | |
4458 | *p = '\0'; | |
4459 | p++; | |
4460 | if (strcmp(line, uname)) | |
4461 | continue; | |
4462 | p2 = strchr(p, ':'); | |
4463 | if (!p2) | |
4464 | continue; | |
4465 | *p2 = '\0'; | |
4466 | p2++; | |
4467 | if (!*p2) | |
4468 | continue; | |
4469 | gid = atoi(p); | |
4470 | grange = atoi(p2); | |
4471 | } | |
4472 | fclose(f); | |
4473 | ||
f10fad2f | 4474 | free(line); |
97e9cfa0 SH |
4475 | |
4476 | if (!urange || !grange) { | |
4477 | ERROR("You do not have subuids or subgids allocated"); | |
4478 | ERROR("Unprivileged containers require subuids and subgids"); | |
4479 | return; | |
4480 | } | |
4481 | ||
4482 | ERROR("You must either run as root, or define uid mappings"); | |
4483 | ERROR("To pass uid mappings to lxc-create, you could create"); | |
4484 | ERROR("~/.config/lxc/default.conf:"); | |
4485 | ERROR("lxc.include = %s", LXC_DEFAULT_CONFIG); | |
4486 | ERROR("lxc.id_map = u 0 %u %u", uid, urange); | |
4487 | ERROR("lxc.id_map = g 0 %u %u", gid, grange); | |
4488 | ||
4489 | free(gname); | |
4490 | free(uname); | |
4491 | } |