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0ad19a3f | 1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2007, 2008 | |
5 | * | |
6 | * Authors: | |
7 | * Daniel Lezcano <dlezcano at fr.ibm.com> | |
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 | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | */ | |
23 | ||
ff218c25 | 24 | #include "../config.h" |
0ad19a3f | 25 | #include <stdio.h> |
26 | #undef _GNU_SOURCE | |
27 | #include <string.h> | |
28 | #include <stdlib.h> | |
29 | #include <dirent.h> | |
30 | #include <errno.h> | |
31 | #include <unistd.h> | |
32 | #include <signal.h> | |
b0a33c1e | 33 | #include <fcntl.h> |
34 | #include <termios.h> | |
50e98013 | 35 | #include <namespace.h> |
0ad19a3f | 36 | #include <sys/param.h> |
37 | #include <sys/file.h> | |
f4d507d5 | 38 | #include <sys/mount.h> |
0ad19a3f | 39 | #include <sys/types.h> |
0ad19a3f | 40 | #include <sys/prctl.h> |
ddceb1f9 | 41 | #include <sys/types.h> |
42ff343d | 42 | #include <sys/capability.h> |
0ad19a3f | 43 | #include <sys/wait.h> |
b0a33c1e | 44 | #include <sys/un.h> |
45 | #include <sys/poll.h> | |
ff218c25 | 46 | |
47 | #ifdef HAVE_SYS_SIGNALFD_H | |
8ca61733 | 48 | # include <sys/signalfd.h> |
ff218c25 | 49 | #else |
8ca61733 MJ |
50 | # ifndef __NR_signalfd4 |
51 | /* assume kernel headers are too old */ | |
52 | # if __i386__ | |
53 | # define __NR_signalfd4 327 | |
54 | # elif __x86_64__ | |
55 | # define __NR_signalfd4 289 | |
bfa38025 MH |
56 | # elif __powerpc__ |
57 | # define __NR_signalfd4 313 | |
47f38330 SH |
58 | # elif __s390x__ |
59 | # define __NR_signalfd4 322 | |
8ca61733 MJ |
60 | # endif |
61 | #endif | |
62 | ||
63 | # ifndef __NR_signalfd | |
64 | /* assume kernel headers are too old */ | |
65 | # if __i386__ | |
66 | # define __NR_signalfd 321 | |
67 | # elif __x86_64__ | |
68 | # define __NR_signalfd 282 | |
bfa38025 MH |
69 | # elif __powerpc__ |
70 | # define __NR_signalfd 305 | |
47f38330 SH |
71 | # elif __s390x__ |
72 | # define __NR_signalfd 316 | |
8ca61733 MJ |
73 | # endif |
74 | #endif | |
75 | ||
76 | int signalfd(int fd, const sigset_t *mask, int flags) | |
77 | { | |
78 | int retval; | |
79 | ||
80 | retval = syscall (__NR_signalfd4, fd, mask, _NSIG / 8, flags); | |
81 | if (errno == ENOSYS && flags == 0) | |
82 | retval = syscall (__NR_signalfd, fd, mask, _NSIG / 8); | |
83 | return retval; | |
84 | } | |
ff218c25 | 85 | #endif |
0ad19a3f | 86 | |
656994bb MH |
87 | #if !HAVE_DECL_PR_CAPBSET_DROP |
88 | #define PR_CAPBSET_DROP 24 | |
89 | #endif | |
90 | ||
00b3c2e2 CLG |
91 | #include <lxc/log.h> |
92 | #include <lxc/conf.h> | |
93 | #include <lxc/confile.h> | |
94 | #include <lxc/start.h> | |
95 | #include <lxc/utils.h> | |
96 | #include <lxc/cgroup.h> | |
97 | #include <lxc/monitor.h> | |
98 | ||
e2bcd7db | 99 | #include "error.h" |
b0a33c1e | 100 | #include "af_unix.h" |
101 | #include "mainloop.h" | |
96fa1ff0 | 102 | #include "commands.h" |
e2bcd7db | 103 | |
36eb9bde CLG |
104 | |
105 | lxc_log_define(lxc_start, lxc); | |
106 | ||
0ad19a3f | 107 | LXC_TTY_HANDLER(SIGINT); |
108 | LXC_TTY_HANDLER(SIGQUIT); | |
109 | ||
b0a33c1e | 110 | static int setup_sigchld_fd(sigset_t *oldmask) |
111 | { | |
112 | sigset_t mask; | |
113 | int fd; | |
114 | ||
115 | if (sigprocmask(SIG_BLOCK, NULL, &mask)) { | |
36eb9bde | 116 | SYSERROR("failed to get mask signal"); |
b0a33c1e | 117 | return -1; |
118 | } | |
119 | ||
120 | if (sigaddset(&mask, SIGCHLD) || sigprocmask(SIG_BLOCK, &mask, oldmask)) { | |
36eb9bde | 121 | SYSERROR("failed to set mask signal"); |
b0a33c1e | 122 | return -1; |
123 | } | |
124 | ||
125 | fd = signalfd(-1, &mask, 0); | |
126 | if (fd < 0) { | |
36eb9bde | 127 | SYSERROR("failed to create the signal fd"); |
b0a33c1e | 128 | return -1; |
129 | } | |
130 | ||
131 | if (fcntl(fd, F_SETFD, FD_CLOEXEC)) { | |
36eb9bde | 132 | SYSERROR("failed to set sigfd to close-on-exec"); |
b0a33c1e | 133 | close(fd); |
134 | return -1; | |
135 | } | |
136 | ||
1ac470c0 DL |
137 | DEBUG("sigchild handler set"); |
138 | ||
b0a33c1e | 139 | return fd; |
140 | } | |
141 | ||
b0a33c1e | 142 | static int sigchld_handler(int fd, void *data, |
143 | struct lxc_epoll_descr *descr) | |
144 | { | |
1ac470c0 DL |
145 | DEBUG("child exited"); |
146 | ||
b0a33c1e | 147 | return 1; |
148 | } | |
149 | ||
25c2aca5 | 150 | int lxc_set_state(const char *name, struct lxc_handler *handler, lxc_state_t state) |
66aeffc7 DL |
151 | { |
152 | handler->state = state; | |
153 | lxc_monitor_send_state(name, state); | |
154 | return 0; | |
155 | } | |
156 | ||
1bc5cc8c | 157 | int lxc_poll(const char *name, struct lxc_handler *handler) |
b0a33c1e | 158 | { |
ca5f7926 DL |
159 | int sigfd = handler->sigfd; |
160 | int pid = handler->pid; | |
b0a33c1e | 161 | struct lxc_epoll_descr descr; |
162 | ||
a9e61274 | 163 | if (lxc_mainloop_open(&descr)) { |
36eb9bde | 164 | ERROR("failed to create mainloop"); |
50c8bf05 | 165 | goto out_sigfd; |
b0a33c1e | 166 | } |
167 | ||
168 | if (lxc_mainloop_add_handler(&descr, sigfd, sigchld_handler, &pid)) { | |
36eb9bde | 169 | ERROR("failed to add handler for the signal"); |
b0a33c1e | 170 | goto out_mainloop_open; |
171 | } | |
172 | ||
724e753c | 173 | if (lxc_command_mainloop_add(name, &descr, handler)) |
96fa1ff0 | 174 | goto out_mainloop_open; |
b0a33c1e | 175 | |
c3e13372 | 176 | return lxc_mainloop(&descr); |
b0a33c1e | 177 | |
178 | out_mainloop_open: | |
179 | lxc_mainloop_close(&descr); | |
b0a33c1e | 180 | out_sigfd: |
181 | close(sigfd); | |
c3e13372 | 182 | return -1; |
b0a33c1e | 183 | } |
184 | ||
b8f57738 DL |
185 | static int fdname(int fd, char *name, size_t size) |
186 | { | |
187 | char path[MAXPATHLEN]; | |
acc86941 | 188 | ssize_t len; |
b8f57738 DL |
189 | |
190 | snprintf(path, MAXPATHLEN, "/proc/self/fd/%d", fd); | |
191 | ||
acc86941 MN |
192 | len = readlink(path, name, size); |
193 | if (len > 0) | |
194 | path[len] = '\0'; | |
195 | ||
196 | return (len <= 0) ? -1 : 0; | |
b8f57738 DL |
197 | } |
198 | ||
199 | static int console_init(char *console, size_t size) | |
200 | { | |
201 | struct stat stat; | |
202 | int i; | |
203 | ||
204 | for (i = 0; i < 3; i++) { | |
205 | if (!isatty(i)) | |
206 | continue; | |
207 | ||
208 | if (ttyname_r(i, console, size)) { | |
209 | SYSERROR("failed to retrieve tty name"); | |
210 | return -1; | |
211 | } | |
af795875 | 212 | |
b8f57738 DL |
213 | return 0; |
214 | } | |
215 | ||
216 | if (!fstat(0, &stat)) { | |
217 | if (S_ISREG(stat.st_mode) || S_ISCHR(stat.st_mode) || | |
218 | S_ISFIFO(stat.st_mode) || S_ISLNK(stat.st_mode)) | |
219 | return fdname(0, console, size); | |
220 | } | |
221 | ||
222 | console[0] = '\0'; | |
1ac470c0 DL |
223 | |
224 | DEBUG("console initialized"); | |
225 | ||
b8f57738 DL |
226 | return 0; |
227 | } | |
228 | ||
fae349da | 229 | struct lxc_handler *lxc_init(const char *name, struct lxc_conf *conf) |
59eb99ba | 230 | { |
3a0f472d DL |
231 | struct lxc_handler *handler; |
232 | ||
233 | handler = malloc(sizeof(*handler)); | |
234 | if (!handler) | |
235 | return NULL; | |
59eb99ba DL |
236 | |
237 | memset(handler, 0, sizeof(*handler)); | |
238 | ||
fae349da DL |
239 | handler->conf = conf; |
240 | ||
0ad19a3f | 241 | /* Begin the set the state to STARTING*/ |
25c2aca5 | 242 | if (lxc_set_state(name, handler, STARTING)) { |
59eb99ba | 243 | ERROR("failed to set state '%s'", lxc_state2str(STARTING)); |
884866b3 | 244 | goto out_free; |
0ad19a3f | 245 | } |
246 | ||
fae349da | 247 | if (console_init(conf->console, sizeof(conf->console))) { |
b8f57738 DL |
248 | ERROR("failed to initialize the console"); |
249 | goto out_aborting; | |
250 | } | |
939229eb | 251 | |
fae349da | 252 | if (lxc_create_tty(name, conf)) { |
36eb9bde | 253 | ERROR("failed to create the ttys"); |
59eb99ba | 254 | goto out_aborting; |
b0a33c1e | 255 | } |
256 | ||
257 | /* the signal fd has to be created before forking otherwise | |
258 | * if the child process exits before we setup the signal fd, | |
259 | * the event will be lost and the command will be stuck */ | |
59eb99ba DL |
260 | handler->sigfd = setup_sigchld_fd(&handler->oldmask); |
261 | if (handler->sigfd < 0) { | |
36eb9bde | 262 | ERROR("failed to set sigchild fd handler"); |
59eb99ba | 263 | goto out_delete_tty; |
b0a33c1e | 264 | } |
265 | ||
59eb99ba DL |
266 | /* Avoid signals from terminal */ |
267 | LXC_TTY_ADD_HANDLER(SIGINT); | |
268 | LXC_TTY_ADD_HANDLER(SIGQUIT); | |
269 | ||
c3e13372 | 270 | INFO("'%s' is initialized", name); |
3a0f472d | 271 | return handler; |
59eb99ba DL |
272 | |
273 | out_delete_tty: | |
fae349da | 274 | lxc_delete_tty(&conf->tty_info); |
59eb99ba | 275 | out_aborting: |
25c2aca5 | 276 | lxc_set_state(name, handler, ABORTING); |
3a0f472d DL |
277 | out_free: |
278 | free(handler); | |
c3e13372 | 279 | return NULL; |
59eb99ba DL |
280 | } |
281 | ||
1bc5cc8c | 282 | void lxc_fini(const char *name, struct lxc_handler *handler) |
59eb99ba DL |
283 | { |
284 | /* The STOPPING state is there for future cleanup code | |
285 | * which can take awhile | |
286 | */ | |
25c2aca5 MN |
287 | lxc_set_state(name, handler, STOPPING); |
288 | lxc_set_state(name, handler, STOPPED); | |
59eb99ba DL |
289 | lxc_unlink_nsgroup(name); |
290 | ||
b2431939 GK |
291 | lxc_delete_tty(&handler->conf->tty_info); |
292 | free(handler); | |
59eb99ba DL |
293 | |
294 | LXC_TTY_DEL_HANDLER(SIGQUIT); | |
295 | LXC_TTY_DEL_HANDLER(SIGINT); | |
296 | } | |
297 | ||
1bc5cc8c | 298 | void lxc_abort(const char *name, struct lxc_handler *handler) |
59eb99ba | 299 | { |
25c2aca5 | 300 | lxc_set_state(name, handler, ABORTING); |
59eb99ba DL |
301 | kill(handler->pid, SIGKILL); |
302 | } | |
303 | ||
50e98013 DL |
304 | struct start_arg { |
305 | const char *name; | |
306 | char *const *argv; | |
307 | struct lxc_handler *handler; | |
308 | int *sv; | |
309 | }; | |
310 | ||
311 | static int do_start(void *arg) | |
312 | { | |
313 | struct start_arg *start_arg = arg; | |
314 | struct lxc_handler *handler = start_arg->handler; | |
315 | const char *name = start_arg->name; | |
316 | char *const *argv = start_arg->argv; | |
317 | int *sv = start_arg->sv; | |
318 | int err = -1, sync; | |
319 | ||
320 | if (sigprocmask(SIG_SETMASK, &handler->oldmask, NULL)) { | |
321 | SYSERROR("failed to set sigprocmask"); | |
9d7f9e52 | 322 | return -1; |
50e98013 DL |
323 | } |
324 | ||
325 | close(sv[1]); | |
326 | ||
327 | /* Be sure we don't inherit this after the exec */ | |
328 | fcntl(sv[0], F_SETFD, FD_CLOEXEC); | |
329 | ||
330 | /* Tell our father he can begin to configure the container */ | |
331 | if (write(sv[0], &sync, sizeof(sync)) < 0) { | |
332 | SYSERROR("failed to write socket"); | |
9d7f9e52 | 333 | return -1; |
50e98013 DL |
334 | } |
335 | ||
336 | /* Wait for the father to finish the configuration */ | |
337 | if (read(sv[0], &sync, sizeof(sync)) < 0) { | |
338 | SYSERROR("failed to read socket"); | |
9d7f9e52 | 339 | return -1; |
50e98013 DL |
340 | } |
341 | ||
342 | /* Setup the container, ip, names, utsname, ... */ | |
fae349da | 343 | if (lxc_setup(name, handler->conf)) { |
50e98013 DL |
344 | ERROR("failed to setup the container"); |
345 | goto out_warn_father; | |
346 | } | |
347 | ||
348 | if (prctl(PR_CAPBSET_DROP, CAP_SYS_BOOT, 0, 0, 0)) { | |
349 | SYSERROR("failed to remove CAP_SYS_BOOT capability"); | |
9d7f9e52 | 350 | return -1; |
50e98013 DL |
351 | } |
352 | ||
6a6ad7af DL |
353 | if (prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0)) { |
354 | SYSERROR("failed to set pdeath signal"); | |
9d7f9e52 | 355 | return -1; |
6a6ad7af DL |
356 | } |
357 | ||
1ac470c0 DL |
358 | NOTICE("exec'ing '%s'", argv[0]); |
359 | ||
50e98013 DL |
360 | execvp(argv[0], argv); |
361 | SYSERROR("failed to exec %s", argv[0]); | |
362 | ||
363 | out_warn_father: | |
364 | /* If the exec fails, tell that to our father */ | |
365 | if (write(sv[0], &err, sizeof(err)) < 0) | |
366 | SYSERROR("failed to write the socket"); | |
50e98013 DL |
367 | return -1; |
368 | } | |
369 | ||
9618063c | 370 | int lxc_spawn(const char *name, struct lxc_handler *handler, char *const argv[]) |
59eb99ba DL |
371 | { |
372 | int sv[2]; | |
373 | int clone_flags; | |
374 | int err = -1, sync; | |
375 | ||
50e98013 DL |
376 | struct start_arg start_arg = { |
377 | .name = name, | |
378 | .argv = argv, | |
379 | .handler = handler, | |
380 | .sv = sv, | |
381 | }; | |
382 | ||
0ad19a3f | 383 | /* Synchro socketpair */ |
384 | if (socketpair(AF_LOCAL, SOCK_STREAM, 0, sv)) { | |
36eb9bde | 385 | SYSERROR("failed to create communication socketpair"); |
9d7f9e52 | 386 | return -1; |
0ad19a3f | 387 | } |
388 | ||
1ea6db29 | 389 | clone_flags = CLONE_NEWUTS|CLONE_NEWPID|CLONE_NEWIPC|CLONE_NEWNS; |
fae349da | 390 | if (!lxc_list_empty(&handler->conf->network)) { |
82d5ae15 | 391 | |
0ad19a3f | 392 | clone_flags |= CLONE_NEWNET; |
393 | ||
82d5ae15 DL |
394 | /* that should be done before the clone because we will |
395 | * fill the netdev index and use them in the child | |
396 | */ | |
fae349da | 397 | if (lxc_create_network(&handler->conf->network)) { |
82d5ae15 DL |
398 | ERROR("failed to create the network"); |
399 | goto out_close; | |
400 | } | |
401 | } | |
402 | ||
0ad19a3f | 403 | /* Create a process in a new set of namespaces */ |
50e98013 | 404 | handler->pid = lxc_clone(do_start, &start_arg, clone_flags); |
59eb99ba | 405 | if (handler->pid < 0) { |
36eb9bde | 406 | SYSERROR("failed to fork into a new namespace"); |
59eb99ba | 407 | goto out_close; |
0ad19a3f | 408 | } |
409 | ||
0ad19a3f | 410 | close(sv[0]); |
411 | ||
412 | /* Wait for the child to be ready */ | |
413 | if (read(sv[1], &sync, sizeof(sync)) < 0) { | |
36eb9bde | 414 | SYSERROR("failed to read the socket"); |
59eb99ba | 415 | goto out_abort; |
0ad19a3f | 416 | } |
417 | ||
9f44c578 | 418 | if (lxc_rename_nsgroup(name, handler)) |
2b31f553 | 419 | goto out_abort; |
218d4250 | 420 | |
0ad19a3f | 421 | /* Create the network configuration */ |
82d5ae15 | 422 | if (clone_flags & CLONE_NEWNET) { |
fae349da | 423 | if (lxc_assign_network(&handler->conf->network, handler->pid)) { |
82d5ae15 DL |
424 | ERROR("failed to create the configured network"); |
425 | goto out_abort; | |
426 | } | |
0ad19a3f | 427 | } |
428 | ||
429 | /* Tell the child to continue its initialization */ | |
430 | if (write(sv[1], &sync, sizeof(sync)) < 0) { | |
36eb9bde | 431 | SYSERROR("failed to write the socket"); |
59eb99ba | 432 | goto out_abort; |
0ad19a3f | 433 | } |
434 | ||
435 | /* Wait for the child to exec or returning an error */ | |
e043236e | 436 | if (read(sv[1], &sync, sizeof(sync)) < 0) { |
36eb9bde | 437 | ERROR("failed to read the socket"); |
59eb99ba | 438 | goto out_abort; |
0ad19a3f | 439 | } |
440 | ||
25c2aca5 | 441 | if (lxc_set_state(name, handler, RUNNING)) { |
59eb99ba DL |
442 | ERROR("failed to set state to %s", |
443 | lxc_state2str(RUNNING)); | |
444 | goto out_abort; | |
3f21c114 | 445 | } |
22ebac19 | 446 | |
59eb99ba | 447 | err = 0; |
22ebac19 | 448 | |
1ac470c0 DL |
449 | NOTICE("'%s' started with pid '%d'", argv[0], handler->pid); |
450 | ||
59eb99ba DL |
451 | out_close: |
452 | close(sv[0]); | |
453 | close(sv[1]); | |
59eb99ba | 454 | return err; |
0ad19a3f | 455 | |
59eb99ba DL |
456 | out_abort: |
457 | lxc_abort(name, handler); | |
b79fcd86 GK |
458 | close(sv[1]); |
459 | return -1; | |
59eb99ba | 460 | } |
0ad19a3f | 461 | |
fae349da | 462 | int lxc_start(const char *name, char *const argv[], struct lxc_conf *conf) |
59eb99ba | 463 | { |
3a0f472d | 464 | struct lxc_handler *handler; |
e043236e | 465 | int err = -1; |
59eb99ba DL |
466 | int status; |
467 | ||
fae349da | 468 | handler = lxc_init(name, conf); |
3a0f472d | 469 | if (!handler) { |
59eb99ba | 470 | ERROR("failed to initialize the container"); |
66aeffc7 | 471 | return -1; |
0ad19a3f | 472 | } |
473 | ||
3a0f472d | 474 | err = lxc_spawn(name, handler, argv); |
59eb99ba DL |
475 | if (err) { |
476 | ERROR("failed to spawn '%s'", argv[0]); | |
9d7f9e52 | 477 | goto out_fini; |
0ad19a3f | 478 | } |
479 | ||
af795875 | 480 | err = lxc_close_all_inherited_fd(); |
d983b93c MN |
481 | if (err) { |
482 | ERROR("unable to close inherited fds"); | |
483 | goto out_abort; | |
484 | } | |
485 | ||
3a0f472d | 486 | err = lxc_poll(name, handler); |
e043236e | 487 | if (err) { |
59eb99ba DL |
488 | ERROR("mainloop exited with an error"); |
489 | goto out_abort; | |
490 | } | |
0ad19a3f | 491 | |
3a0f472d | 492 | while (waitpid(handler->pid, &status, 0) < 0 && errno == EINTR) |
1bc5cc8c | 493 | continue; |
e043236e | 494 | |
3a0f472d | 495 | err = lxc_error_set_and_log(handler->pid, status); |
9d7f9e52 | 496 | out_fini: |
3a0f472d | 497 | lxc_fini(name, handler); |
0ad19a3f | 498 | return err; |
499 | ||
59eb99ba | 500 | out_abort: |
3a0f472d | 501 | lxc_abort(name, handler); |
9d7f9e52 | 502 | goto out_fini; |
0ad19a3f | 503 | } |