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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 | */ |
23 | #define _GNU_SOURCE | |
24 | #include <stdio.h> | |
25 | #undef _GNU_SOURCE | |
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> |
e3b4c4c4 | 32 | #include <sys/wait.h> |
2d76d1d7 | 33 | #include <sys/syscall.h> |
4a0ba80d | 34 | #include <time.h> |
e827ff7e | 35 | |
4ba0d9af SG |
36 | #if HAVE_IFADDRS_H |
37 | #include <ifaddrs.h> | |
38 | #else | |
39 | #include <../include/ifaddrs.h> | |
40 | #endif | |
41 | ||
e827ff7e | 42 | #if HAVE_PTY_H |
b0a33c1e | 43 | #include <pty.h> |
e827ff7e SG |
44 | #else |
45 | #include <../include/openpty.h> | |
46 | #endif | |
0ad19a3f | 47 | |
b3ecde1e DL |
48 | #include <linux/loop.h> |
49 | ||
0ad19a3f | 50 | #include <sys/types.h> |
51 | #include <sys/utsname.h> | |
52 | #include <sys/param.h> | |
53 | #include <sys/stat.h> | |
54 | #include <sys/socket.h> | |
55 | #include <sys/mount.h> | |
56 | #include <sys/mman.h> | |
81810dd1 | 57 | #include <sys/prctl.h> |
0ad19a3f | 58 | |
59 | #include <arpa/inet.h> | |
60 | #include <fcntl.h> | |
61 | #include <netinet/in.h> | |
62 | #include <net/if.h> | |
6f4a3756 | 63 | #include <libgen.h> |
0ad19a3f | 64 | |
e5bda9ee | 65 | #include "network.h" |
66 | #include "error.h" | |
b2718c72 | 67 | #include "parse.h" |
881450bb | 68 | #include "config.h" |
1b09f2c0 DL |
69 | #include "utils.h" |
70 | #include "conf.h" | |
71 | #include "log.h" | |
72 | #include "lxc.h" /* for lxc_cgroup_set() */ | |
d55bc1ad | 73 | #include "caps.h" /* for lxc_caps_last_cap() */ |
9be53773 | 74 | #include "bdev.h" |
368bbc02 | 75 | #include "cgroup.h" |
025ed0f3 | 76 | #include "lxclock.h" |
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 | |
0ad19a3f | 97 | #define MAXHWLEN 18 |
98 | #define MAXINDEXLEN 20 | |
442cbbe6 | 99 | #define MAXMTULEN 16 |
0ad19a3f | 100 | #define MAXLINELEN 128 |
101 | ||
495d2046 | 102 | #if HAVE_SYS_CAPABILITY_H |
b09094da MN |
103 | #ifndef CAP_SETFCAP |
104 | #define CAP_SETFCAP 31 | |
105 | #endif | |
106 | ||
107 | #ifndef CAP_MAC_OVERRIDE | |
108 | #define CAP_MAC_OVERRIDE 32 | |
109 | #endif | |
110 | ||
111 | #ifndef CAP_MAC_ADMIN | |
112 | #define CAP_MAC_ADMIN 33 | |
113 | #endif | |
495d2046 | 114 | #endif |
b09094da MN |
115 | |
116 | #ifndef PR_CAPBSET_DROP | |
117 | #define PR_CAPBSET_DROP 24 | |
118 | #endif | |
119 | ||
9818cae4 SG |
120 | #ifndef LO_FLAGS_AUTOCLEAR |
121 | #define LO_FLAGS_AUTOCLEAR 4 | |
122 | #endif | |
123 | ||
2d76d1d7 SG |
124 | /* Define pivot_root() if missing from the C library */ |
125 | #ifndef HAVE_PIVOT_ROOT | |
126 | static int pivot_root(const char * new_root, const char * put_old) | |
127 | { | |
128 | #ifdef __NR_pivot_root | |
129 | return syscall(__NR_pivot_root, new_root, put_old); | |
130 | #else | |
131 | errno = ENOSYS; | |
132 | return -1; | |
133 | #endif | |
134 | } | |
135 | #else | |
136 | extern int pivot_root(const char * new_root, const char * put_old); | |
137 | #endif | |
138 | ||
139 | /* Define sethostname() if missing from the C library */ | |
140 | #ifndef HAVE_SETHOSTNAME | |
141 | static int sethostname(const char * name, size_t len) | |
142 | { | |
143 | #ifdef __NR_sethostname | |
144 | return syscall(__NR_sethostname, name, len); | |
145 | #else | |
146 | errno = ENOSYS; | |
147 | return -1; | |
148 | #endif | |
149 | } | |
150 | #endif | |
151 | ||
72f919c4 SG |
152 | /* Define __S_ISTYPE if missing from the C library */ |
153 | #ifndef __S_ISTYPE | |
154 | #define __S_ISTYPE(mode, mask) (((mode) & S_IFMT) == (mask)) | |
155 | #endif | |
156 | ||
72d0e1cb | 157 | char *lxchook_names[NUM_LXC_HOOKS] = { |
148e91f5 | 158 | "pre-start", "pre-mount", "mount", "autodev", "start", "post-stop", "clone" }; |
72d0e1cb | 159 | |
e3b4c4c4 | 160 | typedef int (*instanciate_cb)(struct lxc_handler *, struct lxc_netdev *); |
0ad19a3f | 161 | |
998ac676 RT |
162 | struct mount_opt { |
163 | char *name; | |
164 | int clear; | |
165 | int flag; | |
166 | }; | |
167 | ||
81810dd1 DL |
168 | struct caps_opt { |
169 | char *name; | |
170 | int value; | |
171 | }; | |
172 | ||
e3b4c4c4 ST |
173 | static int instanciate_veth(struct lxc_handler *, struct lxc_netdev *); |
174 | static int instanciate_macvlan(struct lxc_handler *, struct lxc_netdev *); | |
175 | static int instanciate_vlan(struct lxc_handler *, struct lxc_netdev *); | |
176 | static int instanciate_phys(struct lxc_handler *, struct lxc_netdev *); | |
177 | static int instanciate_empty(struct lxc_handler *, struct lxc_netdev *); | |
82d5ae15 | 178 | |
24654103 DL |
179 | static instanciate_cb netdev_conf[LXC_NET_MAXCONFTYPE + 1] = { |
180 | [LXC_NET_VETH] = instanciate_veth, | |
181 | [LXC_NET_MACVLAN] = instanciate_macvlan, | |
182 | [LXC_NET_VLAN] = instanciate_vlan, | |
183 | [LXC_NET_PHYS] = instanciate_phys, | |
184 | [LXC_NET_EMPTY] = instanciate_empty, | |
0ad19a3f | 185 | }; |
186 | ||
74a2b586 JK |
187 | static int shutdown_veth(struct lxc_handler *, struct lxc_netdev *); |
188 | static int shutdown_macvlan(struct lxc_handler *, struct lxc_netdev *); | |
189 | static int shutdown_vlan(struct lxc_handler *, struct lxc_netdev *); | |
190 | static int shutdown_phys(struct lxc_handler *, struct lxc_netdev *); | |
191 | static int shutdown_empty(struct lxc_handler *, struct lxc_netdev *); | |
192 | ||
193 | static instanciate_cb netdev_deconf[LXC_NET_MAXCONFTYPE + 1] = { | |
194 | [LXC_NET_VETH] = shutdown_veth, | |
195 | [LXC_NET_MACVLAN] = shutdown_macvlan, | |
196 | [LXC_NET_VLAN] = shutdown_vlan, | |
197 | [LXC_NET_PHYS] = shutdown_phys, | |
198 | [LXC_NET_EMPTY] = shutdown_empty, | |
199 | }; | |
200 | ||
998ac676 | 201 | static struct mount_opt mount_opt[] = { |
88d413d5 SW |
202 | { "defaults", 0, 0 }, |
203 | { "ro", 0, MS_RDONLY }, | |
204 | { "rw", 1, MS_RDONLY }, | |
205 | { "suid", 1, MS_NOSUID }, | |
206 | { "nosuid", 0, MS_NOSUID }, | |
207 | { "dev", 1, MS_NODEV }, | |
208 | { "nodev", 0, MS_NODEV }, | |
209 | { "exec", 1, MS_NOEXEC }, | |
210 | { "noexec", 0, MS_NOEXEC }, | |
211 | { "sync", 0, MS_SYNCHRONOUS }, | |
212 | { "async", 1, MS_SYNCHRONOUS }, | |
213 | { "dirsync", 0, MS_DIRSYNC }, | |
214 | { "remount", 0, MS_REMOUNT }, | |
215 | { "mand", 0, MS_MANDLOCK }, | |
216 | { "nomand", 1, MS_MANDLOCK }, | |
217 | { "atime", 1, MS_NOATIME }, | |
218 | { "noatime", 0, MS_NOATIME }, | |
219 | { "diratime", 1, MS_NODIRATIME }, | |
220 | { "nodiratime", 0, MS_NODIRATIME }, | |
221 | { "bind", 0, MS_BIND }, | |
222 | { "rbind", 0, MS_BIND|MS_REC }, | |
223 | { "relatime", 0, MS_RELATIME }, | |
224 | { "norelatime", 1, MS_RELATIME }, | |
225 | { "strictatime", 0, MS_STRICTATIME }, | |
226 | { "nostrictatime", 1, MS_STRICTATIME }, | |
227 | { NULL, 0, 0 }, | |
998ac676 RT |
228 | }; |
229 | ||
495d2046 | 230 | #if HAVE_SYS_CAPABILITY_H |
81810dd1 | 231 | static struct caps_opt caps_opt[] = { |
a6afdde9 | 232 | { "chown", CAP_CHOWN }, |
1e11be34 DL |
233 | { "dac_override", CAP_DAC_OVERRIDE }, |
234 | { "dac_read_search", CAP_DAC_READ_SEARCH }, | |
235 | { "fowner", CAP_FOWNER }, | |
236 | { "fsetid", CAP_FSETID }, | |
81810dd1 DL |
237 | { "kill", CAP_KILL }, |
238 | { "setgid", CAP_SETGID }, | |
239 | { "setuid", CAP_SETUID }, | |
240 | { "setpcap", CAP_SETPCAP }, | |
241 | { "linux_immutable", CAP_LINUX_IMMUTABLE }, | |
242 | { "net_bind_service", CAP_NET_BIND_SERVICE }, | |
243 | { "net_broadcast", CAP_NET_BROADCAST }, | |
244 | { "net_admin", CAP_NET_ADMIN }, | |
245 | { "net_raw", CAP_NET_RAW }, | |
246 | { "ipc_lock", CAP_IPC_LOCK }, | |
247 | { "ipc_owner", CAP_IPC_OWNER }, | |
248 | { "sys_module", CAP_SYS_MODULE }, | |
249 | { "sys_rawio", CAP_SYS_RAWIO }, | |
250 | { "sys_chroot", CAP_SYS_CHROOT }, | |
251 | { "sys_ptrace", CAP_SYS_PTRACE }, | |
252 | { "sys_pacct", CAP_SYS_PACCT }, | |
253 | { "sys_admin", CAP_SYS_ADMIN }, | |
254 | { "sys_boot", CAP_SYS_BOOT }, | |
255 | { "sys_nice", CAP_SYS_NICE }, | |
256 | { "sys_resource", CAP_SYS_RESOURCE }, | |
257 | { "sys_time", CAP_SYS_TIME }, | |
258 | { "sys_tty_config", CAP_SYS_TTY_CONFIG }, | |
259 | { "mknod", CAP_MKNOD }, | |
260 | { "lease", CAP_LEASE }, | |
9527e566 | 261 | #ifdef CAP_AUDIT_WRITE |
81810dd1 | 262 | { "audit_write", CAP_AUDIT_WRITE }, |
9527e566 FW |
263 | #endif |
264 | #ifdef CAP_AUDIT_CONTROL | |
81810dd1 | 265 | { "audit_control", CAP_AUDIT_CONTROL }, |
9527e566 | 266 | #endif |
81810dd1 DL |
267 | { "setfcap", CAP_SETFCAP }, |
268 | { "mac_override", CAP_MAC_OVERRIDE }, | |
269 | { "mac_admin", CAP_MAC_ADMIN }, | |
5170c716 CS |
270 | #ifdef CAP_SYSLOG |
271 | { "syslog", CAP_SYSLOG }, | |
272 | #endif | |
273 | #ifdef CAP_WAKE_ALARM | |
274 | { "wake_alarm", CAP_WAKE_ALARM }, | |
275 | #endif | |
81810dd1 | 276 | }; |
495d2046 SG |
277 | #else |
278 | static struct caps_opt caps_opt[] = {}; | |
279 | #endif | |
81810dd1 | 280 | |
4a0ba80d SG |
281 | static char padchar[] = |
282 | "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; | |
283 | ||
284 | static char *mkifname(char *template) | |
285 | { | |
286 | char *name = NULL; | |
287 | int i = 0; | |
288 | FILE *urandom; | |
289 | unsigned int seed; | |
4a0ba80d SG |
290 | struct ifaddrs *ifaddr, *ifa; |
291 | int ifexists = 0; | |
292 | ||
293 | /* Get all the network interfaces */ | |
294 | getifaddrs(&ifaddr); | |
295 | ||
296 | /* Initialize the random number generator */ | |
025ed0f3 | 297 | process_lock(); |
4a0ba80d | 298 | urandom = fopen ("/dev/urandom", "r"); |
025ed0f3 | 299 | process_unlock(); |
4a0ba80d SG |
300 | if (urandom != NULL) { |
301 | if (fread (&seed, sizeof(seed), 1, urandom) <= 0) | |
302 | seed = time(0); | |
025ed0f3 | 303 | process_lock(); |
4a0ba80d | 304 | fclose(urandom); |
025ed0f3 | 305 | process_unlock(); |
4a0ba80d SG |
306 | } |
307 | else | |
308 | seed = time(0); | |
7f3e12f3 SG |
309 | |
310 | #ifndef HAVE_RAND_R | |
311 | srand(seed); | |
312 | #endif | |
4a0ba80d SG |
313 | |
314 | /* Generate random names until we find one that doesn't exist */ | |
315 | while(1) { | |
316 | ifexists = 0; | |
317 | name = strdup(template); | |
318 | ||
319 | if (name == NULL) | |
320 | return NULL; | |
321 | ||
322 | for (i = 0; i < strlen(name); i++) { | |
323 | if (name[i] == 'X') { | |
7f3e12f3 SG |
324 | #ifdef HAVE_RAND_R |
325 | name[i] = padchar[rand_r(&seed) % (strlen(padchar) - 1)]; | |
326 | #else | |
327 | name[i] = padchar[rand() % (strlen(padchar) - 1)]; | |
328 | #endif | |
4a0ba80d SG |
329 | } |
330 | } | |
331 | ||
332 | for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) { | |
333 | if (strcmp(ifa->ifa_name, name) == 0) { | |
334 | ifexists = 1; | |
335 | break; | |
336 | } | |
337 | } | |
338 | ||
339 | if (ifexists == 0) | |
340 | break; | |
341 | ||
342 | free(name); | |
343 | } | |
344 | ||
345 | freeifaddrs(ifaddr); | |
346 | return name; | |
347 | } | |
348 | ||
91c3830e SH |
349 | static int run_buffer(char *buffer) |
350 | { | |
351 | FILE *f; | |
352 | char *output; | |
8e7da691 | 353 | int ret; |
91c3830e | 354 | |
025ed0f3 | 355 | process_lock(); |
91c3830e | 356 | f = popen(buffer, "r"); |
025ed0f3 | 357 | process_unlock(); |
91c3830e SH |
358 | if (!f) { |
359 | SYSERROR("popen failed"); | |
360 | return -1; | |
361 | } | |
362 | ||
363 | output = malloc(LXC_LOG_BUFFER_SIZE); | |
364 | if (!output) { | |
365 | ERROR("failed to allocate memory for script output"); | |
025ed0f3 | 366 | process_lock(); |
00b6be44 | 367 | pclose(f); |
025ed0f3 | 368 | process_unlock(); |
91c3830e SH |
369 | return -1; |
370 | } | |
371 | ||
372 | while(fgets(output, LXC_LOG_BUFFER_SIZE, f)) | |
373 | DEBUG("script output: %s", output); | |
374 | ||
375 | free(output); | |
376 | ||
025ed0f3 | 377 | process_lock(); |
8e7da691 | 378 | ret = pclose(f); |
025ed0f3 | 379 | process_unlock(); |
8e7da691 | 380 | if (ret == -1) { |
91c3830e SH |
381 | SYSERROR("Script exited on error"); |
382 | return -1; | |
8e7da691 DE |
383 | } else if (WIFEXITED(ret) && WEXITSTATUS(ret) != 0) { |
384 | ERROR("Script exited with status %d", WEXITSTATUS(ret)); | |
385 | return -1; | |
386 | } else if (WIFSIGNALED(ret)) { | |
387 | ERROR("Script terminated by signal %d (%s)", WTERMSIG(ret), | |
388 | strsignal(WTERMSIG(ret))); | |
389 | return -1; | |
91c3830e SH |
390 | } |
391 | ||
392 | return 0; | |
393 | } | |
394 | ||
148e91f5 | 395 | static int run_script_argv(const char *name, const char *section, |
283678ed SH |
396 | const char *script, const char *hook, const char *lxcpath, |
397 | char **argsin) | |
148e91f5 SH |
398 | { |
399 | int ret, i; | |
400 | char *buffer; | |
401 | size_t size = 0; | |
402 | ||
403 | INFO("Executing script '%s' for container '%s', config section '%s'", | |
404 | script, name, section); | |
405 | ||
406 | for (i=0; argsin && argsin[i]; i++) | |
407 | size += strlen(argsin[i]) + 1; | |
408 | ||
409 | size += strlen(hook) + 1; | |
410 | ||
411 | size += strlen(script); | |
412 | size += strlen(name); | |
413 | size += strlen(section); | |
414 | size += 3; | |
415 | ||
416 | if (size > INT_MAX) | |
417 | return -1; | |
418 | ||
419 | buffer = alloca(size); | |
420 | if (!buffer) { | |
421 | ERROR("failed to allocate memory"); | |
422 | return -1; | |
423 | } | |
424 | ||
425 | ret = snprintf(buffer, size, "%s %s %s %s", script, name, section, hook); | |
426 | if (ret < 0 || ret >= size) { | |
427 | ERROR("Script name too long"); | |
428 | return -1; | |
429 | } | |
430 | ||
431 | for (i=0; argsin && argsin[i]; i++) { | |
432 | int len = size-ret; | |
433 | int rc; | |
434 | rc = snprintf(buffer + ret, len, " %s", argsin[i]); | |
435 | if (rc < 0 || rc >= len) { | |
436 | ERROR("Script args too long"); | |
437 | return -1; | |
438 | } | |
439 | ret += rc; | |
440 | } | |
441 | ||
442 | return run_buffer(buffer); | |
443 | } | |
444 | ||
751d9dcd DL |
445 | static int run_script(const char *name, const char *section, |
446 | const char *script, ...) | |
e3b4c4c4 | 447 | { |
abbfd20b | 448 | int ret; |
91c3830e | 449 | char *buffer, *p; |
abbfd20b DL |
450 | size_t size = 0; |
451 | va_list ap; | |
751d9dcd DL |
452 | |
453 | INFO("Executing script '%s' for container '%s', config section '%s'", | |
454 | script, name, section); | |
e3b4c4c4 | 455 | |
abbfd20b DL |
456 | va_start(ap, script); |
457 | while ((p = va_arg(ap, char *))) | |
95642a10 | 458 | size += strlen(p) + 1; |
abbfd20b DL |
459 | va_end(ap); |
460 | ||
461 | size += strlen(script); | |
462 | size += strlen(name); | |
463 | size += strlen(section); | |
95642a10 | 464 | size += 3; |
abbfd20b | 465 | |
95642a10 MS |
466 | if (size > INT_MAX) |
467 | return -1; | |
468 | ||
469 | buffer = alloca(size); | |
abbfd20b DL |
470 | if (!buffer) { |
471 | ERROR("failed to allocate memory"); | |
751d9dcd DL |
472 | return -1; |
473 | } | |
474 | ||
9ba8130c SH |
475 | ret = snprintf(buffer, size, "%s %s %s", script, name, section); |
476 | if (ret < 0 || ret >= size) { | |
477 | ERROR("Script name too long"); | |
9ba8130c SH |
478 | return -1; |
479 | } | |
751d9dcd | 480 | |
abbfd20b | 481 | va_start(ap, script); |
9ba8130c SH |
482 | while ((p = va_arg(ap, char *))) { |
483 | int len = size-ret; | |
484 | int rc; | |
485 | rc = snprintf(buffer + ret, len, " %s", p); | |
486 | if (rc < 0 || rc >= len) { | |
9ba8130c SH |
487 | ERROR("Script args too long"); |
488 | return -1; | |
489 | } | |
490 | ret += rc; | |
491 | } | |
abbfd20b | 492 | va_end(ap); |
751d9dcd | 493 | |
91c3830e | 494 | return run_buffer(buffer); |
e3b4c4c4 ST |
495 | } |
496 | ||
a6afdde9 | 497 | static int find_fstype_cb(char* buffer, void *data) |
78ae2fcc | 498 | { |
499 | struct cbarg { | |
500 | const char *rootfs; | |
a6afdde9 | 501 | const char *target; |
78ae2fcc | 502 | int mntopt; |
503 | } *cbarg = data; | |
504 | ||
505 | char *fstype; | |
506 | ||
507 | /* we don't try 'nodev' entries */ | |
508 | if (strstr(buffer, "nodev")) | |
509 | return 0; | |
510 | ||
511 | fstype = buffer; | |
b2718c72 | 512 | fstype += lxc_char_left_gc(fstype, strlen(fstype)); |
513 | fstype[lxc_char_right_gc(fstype, strlen(fstype))] = '\0'; | |
78ae2fcc | 514 | |
a6afdde9 DL |
515 | DEBUG("trying to mount '%s'->'%s' with fstype '%s'", |
516 | cbarg->rootfs, cbarg->target, fstype); | |
517 | ||
518 | if (mount(cbarg->rootfs, cbarg->target, fstype, cbarg->mntopt, NULL)) { | |
519 | DEBUG("mount failed with error: %s", strerror(errno)); | |
78ae2fcc | 520 | return 0; |
a6afdde9 | 521 | } |
78ae2fcc | 522 | |
a6afdde9 DL |
523 | INFO("mounted '%s' on '%s', with fstype '%s'", |
524 | cbarg->rootfs, cbarg->target, fstype); | |
78ae2fcc | 525 | |
526 | return 1; | |
527 | } | |
528 | ||
2656d231 | 529 | static int mount_unknow_fs(const char *rootfs, const char *target, int mntopt) |
78ae2fcc | 530 | { |
a6afdde9 | 531 | int i; |
78ae2fcc | 532 | |
533 | struct cbarg { | |
534 | const char *rootfs; | |
a6afdde9 | 535 | const char *target; |
78ae2fcc | 536 | int mntopt; |
537 | } cbarg = { | |
538 | .rootfs = rootfs, | |
a6afdde9 | 539 | .target = target, |
78ae2fcc | 540 | .mntopt = mntopt, |
541 | }; | |
542 | ||
a6afdde9 DL |
543 | /* |
544 | * find the filesystem type with brute force: | |
545 | * first we check with /etc/filesystems, in case the modules | |
78ae2fcc | 546 | * are auto-loaded and fall back to the supported kernel fs |
547 | */ | |
548 | char *fsfile[] = { | |
549 | "/etc/filesystems", | |
550 | "/proc/filesystems", | |
551 | }; | |
552 | ||
a6afdde9 DL |
553 | for (i = 0; i < sizeof(fsfile)/sizeof(fsfile[0]); i++) { |
554 | ||
555 | int ret; | |
556 | ||
557 | if (access(fsfile[i], F_OK)) | |
558 | continue; | |
559 | ||
560 | ret = lxc_file_for_each_line(fsfile[i], find_fstype_cb, &cbarg); | |
561 | if (ret < 0) { | |
562 | ERROR("failed to parse '%s'", fsfile[i]); | |
563 | return -1; | |
564 | } | |
565 | ||
566 | if (ret) | |
567 | return 0; | |
78ae2fcc | 568 | } |
569 | ||
a6afdde9 DL |
570 | ERROR("failed to determine fs type for '%s'", rootfs); |
571 | return -1; | |
572 | } | |
573 | ||
2656d231 | 574 | static int mount_rootfs_dir(const char *rootfs, const char *target) |
a6afdde9 DL |
575 | { |
576 | return mount(rootfs, target, "none", MS_BIND | MS_REC, NULL); | |
577 | } | |
578 | ||
579 | static int setup_lodev(const char *rootfs, int fd, struct loop_info64 *loinfo) | |
580 | { | |
581 | int rfd; | |
582 | int ret = -1; | |
583 | ||
025ed0f3 | 584 | process_lock(); |
a6afdde9 | 585 | rfd = open(rootfs, O_RDWR); |
025ed0f3 | 586 | process_unlock(); |
a6afdde9 DL |
587 | if (rfd < 0) { |
588 | SYSERROR("failed to open '%s'", rootfs); | |
78ae2fcc | 589 | return -1; |
590 | } | |
591 | ||
a6afdde9 | 592 | memset(loinfo, 0, sizeof(*loinfo)); |
78ae2fcc | 593 | |
a6afdde9 | 594 | loinfo->lo_flags = LO_FLAGS_AUTOCLEAR; |
78ae2fcc | 595 | |
a6afdde9 DL |
596 | if (ioctl(fd, LOOP_SET_FD, rfd)) { |
597 | SYSERROR("failed to LOOP_SET_FD"); | |
598 | goto out; | |
78ae2fcc | 599 | } |
600 | ||
a6afdde9 DL |
601 | if (ioctl(fd, LOOP_SET_STATUS64, loinfo)) { |
602 | SYSERROR("failed to LOOP_SET_STATUS64"); | |
78ae2fcc | 603 | goto out; |
604 | } | |
605 | ||
a6afdde9 | 606 | ret = 0; |
78ae2fcc | 607 | out: |
025ed0f3 | 608 | process_lock(); |
a6afdde9 | 609 | close(rfd); |
025ed0f3 | 610 | process_unlock(); |
78ae2fcc | 611 | |
a6afdde9 | 612 | return ret; |
78ae2fcc | 613 | } |
614 | ||
2656d231 | 615 | static int mount_rootfs_file(const char *rootfs, const char *target) |
78ae2fcc | 616 | { |
a6afdde9 DL |
617 | struct dirent dirent, *direntp; |
618 | struct loop_info64 loinfo; | |
9ba8130c | 619 | int ret = -1, fd = -1, rc; |
a6afdde9 DL |
620 | DIR *dir; |
621 | char path[MAXPATHLEN]; | |
78ae2fcc | 622 | |
025ed0f3 | 623 | process_lock(); |
a6afdde9 | 624 | dir = opendir("/dev"); |
025ed0f3 | 625 | process_unlock(); |
a6afdde9 DL |
626 | if (!dir) { |
627 | SYSERROR("failed to open '/dev'"); | |
78ae2fcc | 628 | return -1; |
629 | } | |
630 | ||
a6afdde9 DL |
631 | while (!readdir_r(dir, &dirent, &direntp)) { |
632 | ||
633 | if (!direntp) | |
634 | break; | |
635 | ||
636 | if (!strcmp(direntp->d_name, ".")) | |
637 | continue; | |
638 | ||
639 | if (!strcmp(direntp->d_name, "..")) | |
640 | continue; | |
641 | ||
642 | if (strncmp(direntp->d_name, "loop", 4)) | |
643 | continue; | |
644 | ||
9ba8130c SH |
645 | rc = snprintf(path, MAXPATHLEN, "/dev/%s", direntp->d_name); |
646 | if (rc < 0 || rc >= MAXPATHLEN) | |
647 | continue; | |
648 | ||
025ed0f3 | 649 | process_lock(); |
a6afdde9 | 650 | fd = open(path, O_RDWR); |
025ed0f3 | 651 | process_unlock(); |
a6afdde9 DL |
652 | if (fd < 0) |
653 | continue; | |
654 | ||
655 | if (ioctl(fd, LOOP_GET_STATUS64, &loinfo) == 0) { | |
025ed0f3 | 656 | process_lock(); |
a6afdde9 | 657 | close(fd); |
025ed0f3 | 658 | process_unlock(); |
a6afdde9 DL |
659 | continue; |
660 | } | |
661 | ||
662 | if (errno != ENXIO) { | |
663 | WARN("unexpected error for ioctl on '%s': %m", | |
664 | direntp->d_name); | |
025ed0f3 | 665 | process_lock(); |
00b6be44 | 666 | close(fd); |
025ed0f3 | 667 | process_unlock(); |
a6afdde9 DL |
668 | continue; |
669 | } | |
670 | ||
671 | DEBUG("found '%s' free lodev", path); | |
672 | ||
673 | ret = setup_lodev(rootfs, fd, &loinfo); | |
674 | if (!ret) | |
2656d231 | 675 | ret = mount_unknow_fs(path, target, 0); |
025ed0f3 | 676 | process_lock(); |
a6afdde9 | 677 | close(fd); |
025ed0f3 | 678 | process_unlock(); |
a6afdde9 DL |
679 | |
680 | break; | |
681 | } | |
682 | ||
025ed0f3 | 683 | process_lock(); |
a6afdde9 DL |
684 | if (closedir(dir)) |
685 | WARN("failed to close directory"); | |
025ed0f3 | 686 | process_unlock(); |
a6afdde9 DL |
687 | |
688 | return ret; | |
78ae2fcc | 689 | } |
690 | ||
2656d231 | 691 | static int mount_rootfs_block(const char *rootfs, const char *target) |
a6afdde9 | 692 | { |
2656d231 | 693 | return mount_unknow_fs(rootfs, target, 0); |
a6afdde9 DL |
694 | } |
695 | ||
0c547523 SH |
696 | /* |
697 | * pin_rootfs | |
b7ed4bf0 CS |
698 | * if rootfs is a directory, then open ${rootfs}/lxc.hold for writing for |
699 | * the duration of the container run, to prevent the container from marking | |
700 | * the underlying fs readonly on shutdown. unlink the file immediately so | |
701 | * no name pollution is happens | |
0c547523 SH |
702 | * return -1 on error. |
703 | * return -2 if nothing needed to be pinned. | |
704 | * return an open fd (>=0) if we pinned it. | |
705 | */ | |
706 | int pin_rootfs(const char *rootfs) | |
707 | { | |
708 | char absrootfs[MAXPATHLEN]; | |
709 | char absrootfspin[MAXPATHLEN]; | |
710 | struct stat s; | |
711 | int ret, fd; | |
712 | ||
e99ee0de | 713 | if (rootfs == NULL || strlen(rootfs) == 0) |
0d03360a | 714 | return -2; |
e99ee0de | 715 | |
00ec333b | 716 | if (!realpath(rootfs, absrootfs)) |
9be53773 | 717 | return -2; |
0c547523 | 718 | |
00ec333b | 719 | if (access(absrootfs, F_OK)) |
0c547523 | 720 | return -1; |
0c547523 | 721 | |
00ec333b | 722 | if (stat(absrootfs, &s)) |
0c547523 | 723 | return -1; |
0c547523 | 724 | |
72f919c4 | 725 | if (!S_ISDIR(s.st_mode)) |
0c547523 SH |
726 | return -2; |
727 | ||
b7ed4bf0 | 728 | ret = snprintf(absrootfspin, MAXPATHLEN, "%s/lxc.hold", absrootfs); |
00ec333b | 729 | if (ret >= MAXPATHLEN) |
0c547523 | 730 | return -1; |
0c547523 | 731 | |
025ed0f3 | 732 | process_lock(); |
0c547523 | 733 | fd = open(absrootfspin, O_CREAT | O_RDWR, S_IWUSR|S_IRUSR); |
025ed0f3 | 734 | process_unlock(); |
b7ed4bf0 CS |
735 | if (fd < 0) |
736 | return fd; | |
737 | (void)unlink(absrootfspin); | |
0c547523 SH |
738 | return fd; |
739 | } | |
740 | ||
368bbc02 CS |
741 | static int lxc_mount_auto_mounts(struct lxc_conf *conf, int flags, struct cgroup_process_info *cgroup_info) |
742 | { | |
368bbc02 | 743 | int r; |
b06b8511 CS |
744 | size_t i; |
745 | static struct { | |
746 | int match_mask; | |
747 | int match_flag; | |
748 | const char *source; | |
749 | const char *destination; | |
750 | const char *fstype; | |
751 | unsigned long flags; | |
752 | const char *options; | |
753 | } default_mounts[] = { | |
754 | /* Read-only bind-mounting... In older kernels, doing that required | |
755 | * to do one MS_BIND mount and then MS_REMOUNT|MS_RDONLY the same | |
756 | * one. According to mount(2) manpage, MS_BIND honors MS_RDONLY from | |
757 | * kernel 2.6.26 onwards. However, this apparently does not work on | |
758 | * kernel 3.8. Unfortunately, on that very same kernel, doing the | |
759 | * same trick as above doesn't seem to work either, there one needs | |
760 | * to ALSO specify MS_BIND for the remount, otherwise the entire | |
761 | * fs is remounted read-only or the mount fails because it's busy... | |
762 | * MS_REMOUNT|MS_BIND|MS_RDONLY seems to work for kernels as low as | |
763 | * 2.6.32... | |
368bbc02 | 764 | */ |
b06b8511 CS |
765 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, |
766 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys", "%r/proc/sys", NULL, MS_BIND, NULL }, | |
767 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
768 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sysrq-trigger", "%r/proc/sysrq-trigger", NULL, MS_BIND, NULL }, | |
769 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sysrq-trigger", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
770 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_RW, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
771 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RW, "sysfs", "%r/sys", "sysfs", 0, NULL }, | |
772 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RO, "sysfs", "%r/sys", "sysfs", MS_RDONLY, NULL }, | |
773 | { 0, 0, NULL, NULL, NULL, 0, NULL } | |
774 | }; | |
368bbc02 | 775 | |
b06b8511 CS |
776 | for (i = 0; default_mounts[i].match_mask; i++) { |
777 | if ((flags & default_mounts[i].match_mask) == default_mounts[i].match_flag) { | |
778 | char *source = NULL; | |
779 | char *destination = NULL; | |
780 | int saved_errno; | |
781 | ||
782 | if (default_mounts[i].source) { | |
783 | /* will act like strdup if %r is not present */ | |
784 | source = lxc_string_replace("%r", conf->rootfs.mount, default_mounts[i].source); | |
785 | if (!source) { | |
786 | SYSERROR("memory allocation error"); | |
787 | return -1; | |
788 | } | |
789 | } | |
790 | if (default_mounts[i].destination) { | |
791 | /* will act like strdup if %r is not present */ | |
792 | destination = lxc_string_replace("%r", conf->rootfs.mount, default_mounts[i].destination); | |
793 | if (!destination) { | |
794 | saved_errno = errno; | |
795 | SYSERROR("memory allocation error"); | |
796 | free(source); | |
797 | errno = saved_errno; | |
798 | return -1; | |
799 | } | |
800 | } | |
801 | r = mount(source, destination, default_mounts[i].fstype, default_mounts[i].flags, default_mounts[i].options); | |
802 | saved_errno = errno; | |
c414be25 DE |
803 | if (r < 0) |
804 | SYSERROR("error mounting %s on %s", source, destination); | |
b06b8511 CS |
805 | free(source); |
806 | free(destination); | |
807 | if (r < 0) { | |
b06b8511 CS |
808 | errno = saved_errno; |
809 | return -1; | |
810 | } | |
368bbc02 | 811 | } |
368bbc02 CS |
812 | } |
813 | ||
b06b8511 | 814 | if (flags & LXC_AUTO_CGROUP_MASK) { |
7997d7da | 815 | r = lxc_setup_mount_cgroup(conf->rootfs.mount, cgroup_info, flags & LXC_AUTO_CGROUP_MASK); |
368bbc02 CS |
816 | if (r < 0) { |
817 | SYSERROR("error mounting /sys/fs/cgroup"); | |
b06b8511 | 818 | return -1; |
368bbc02 CS |
819 | } |
820 | } | |
821 | ||
368bbc02 | 822 | return 0; |
368bbc02 CS |
823 | } |
824 | ||
2656d231 | 825 | static int mount_rootfs(const char *rootfs, const char *target) |
0ad19a3f | 826 | { |
b09ef133 | 827 | char absrootfs[MAXPATHLEN]; |
78ae2fcc | 828 | struct stat s; |
a6afdde9 | 829 | int i; |
78ae2fcc | 830 | |
a6afdde9 | 831 | typedef int (*rootfs_cb)(const char *, const char *); |
78ae2fcc | 832 | |
833 | struct rootfs_type { | |
834 | int type; | |
835 | rootfs_cb cb; | |
836 | } rtfs_type[] = { | |
2656d231 DL |
837 | { S_IFDIR, mount_rootfs_dir }, |
838 | { S_IFBLK, mount_rootfs_block }, | |
839 | { S_IFREG, mount_rootfs_file }, | |
78ae2fcc | 840 | }; |
0ad19a3f | 841 | |
4c8ab83b | 842 | if (!realpath(rootfs, absrootfs)) { |
36eb9bde | 843 | SYSERROR("failed to get real path for '%s'", rootfs); |
4c8ab83b | 844 | return -1; |
845 | } | |
b09ef133 | 846 | |
b09ef133 | 847 | if (access(absrootfs, F_OK)) { |
36eb9bde | 848 | SYSERROR("'%s' is not accessible", absrootfs); |
b09ef133 | 849 | return -1; |
850 | } | |
851 | ||
78ae2fcc | 852 | if (stat(absrootfs, &s)) { |
36eb9bde | 853 | SYSERROR("failed to stat '%s'", absrootfs); |
9b0f0477 | 854 | return -1; |
855 | } | |
856 | ||
78ae2fcc | 857 | for (i = 0; i < sizeof(rtfs_type)/sizeof(rtfs_type[0]); i++) { |
9b0f0477 | 858 | |
78ae2fcc | 859 | if (!__S_ISTYPE(s.st_mode, rtfs_type[i].type)) |
860 | continue; | |
9b0f0477 | 861 | |
a6afdde9 | 862 | return rtfs_type[i].cb(absrootfs, target); |
78ae2fcc | 863 | } |
9b0f0477 | 864 | |
36eb9bde | 865 | ERROR("unsupported rootfs type for '%s'", absrootfs); |
78ae2fcc | 866 | return -1; |
0ad19a3f | 867 | } |
868 | ||
4e5440c6 | 869 | static int setup_utsname(struct utsname *utsname) |
0ad19a3f | 870 | { |
4e5440c6 DL |
871 | if (!utsname) |
872 | return 0; | |
0ad19a3f | 873 | |
4e5440c6 DL |
874 | if (sethostname(utsname->nodename, strlen(utsname->nodename))) { |
875 | SYSERROR("failed to set the hostname to '%s'", utsname->nodename); | |
0ad19a3f | 876 | return -1; |
877 | } | |
878 | ||
4e5440c6 | 879 | INFO("'%s' hostname has been setup", utsname->nodename); |
cd54d859 | 880 | |
0ad19a3f | 881 | return 0; |
882 | } | |
883 | ||
33fcb7a0 | 884 | static int setup_tty(const struct lxc_rootfs *rootfs, |
7c6ef2a2 | 885 | const struct lxc_tty_info *tty_info, char *ttydir) |
b0a33c1e | 886 | { |
7c6ef2a2 SH |
887 | char path[MAXPATHLEN], lxcpath[MAXPATHLEN]; |
888 | int i, ret; | |
b0a33c1e | 889 | |
bc9bd0e3 DL |
890 | if (!rootfs->path) |
891 | return 0; | |
892 | ||
b0a33c1e | 893 | for (i = 0; i < tty_info->nbtty; i++) { |
894 | ||
895 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; | |
896 | ||
7c6ef2a2 | 897 | ret = snprintf(path, sizeof(path), "%s/dev/tty%d", |
12297168 | 898 | rootfs->mount, i + 1); |
7c6ef2a2 SH |
899 | if (ret >= sizeof(path)) { |
900 | ERROR("pathname too long for ttys"); | |
901 | return -1; | |
902 | } | |
903 | if (ttydir) { | |
904 | /* create dev/lxc/tty%d" */ | |
9ba8130c | 905 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/dev/%s/tty%d", |
7c6ef2a2 SH |
906 | rootfs->mount, ttydir, i + 1); |
907 | if (ret >= sizeof(lxcpath)) { | |
908 | ERROR("pathname too long for ttys"); | |
909 | return -1; | |
910 | } | |
025ed0f3 | 911 | process_lock(); |
7c6ef2a2 | 912 | ret = creat(lxcpath, 0660); |
025ed0f3 | 913 | process_unlock(); |
7c6ef2a2 SH |
914 | if (ret==-1 && errno != EEXIST) { |
915 | SYSERROR("error creating %s\n", lxcpath); | |
916 | return -1; | |
917 | } | |
025ed0f3 | 918 | process_lock(); |
4d44e274 SH |
919 | if (ret >= 0) |
920 | close(ret); | |
025ed0f3 | 921 | process_unlock(); |
7c6ef2a2 SH |
922 | ret = unlink(path); |
923 | if (ret && errno != ENOENT) { | |
924 | SYSERROR("error unlinking %s\n", path); | |
925 | return -1; | |
926 | } | |
b0a33c1e | 927 | |
7c6ef2a2 SH |
928 | if (mount(pty_info->name, lxcpath, "none", MS_BIND, 0)) { |
929 | WARN("failed to mount '%s'->'%s'", | |
930 | pty_info->name, path); | |
931 | continue; | |
932 | } | |
13954cce | 933 | |
9ba8130c SH |
934 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/tty%d", ttydir, i+1); |
935 | if (ret >= sizeof(lxcpath)) { | |
936 | ERROR("tty pathname too long"); | |
937 | return -1; | |
938 | } | |
7c6ef2a2 SH |
939 | ret = symlink(lxcpath, path); |
940 | if (ret) { | |
941 | SYSERROR("failed to create symlink for tty %d\n", i+1); | |
942 | return -1; | |
943 | } | |
944 | } else { | |
c6883f38 SH |
945 | /* If we populated /dev, then we need to create /dev/ttyN */ |
946 | if (access(path, F_OK)) { | |
025ed0f3 | 947 | process_lock(); |
c6883f38 | 948 | ret = creat(path, 0660); |
025ed0f3 | 949 | process_unlock(); |
c6883f38 SH |
950 | if (ret==-1) { |
951 | SYSERROR("error creating %s\n", path); | |
952 | /* this isn't fatal, continue */ | |
025ed0f3 SH |
953 | } else { |
954 | process_lock(); | |
c6883f38 | 955 | close(ret); |
025ed0f3 SH |
956 | process_unlock(); |
957 | } | |
c6883f38 | 958 | } |
7c6ef2a2 SH |
959 | if (mount(pty_info->name, path, "none", MS_BIND, 0)) { |
960 | WARN("failed to mount '%s'->'%s'", | |
961 | pty_info->name, path); | |
962 | continue; | |
963 | } | |
b0a33c1e | 964 | } |
965 | } | |
966 | ||
cd54d859 DL |
967 | INFO("%d tty(s) has been setup", tty_info->nbtty); |
968 | ||
b0a33c1e | 969 | return 0; |
970 | } | |
971 | ||
7a7ff0c6 | 972 | static int setup_rootfs_pivot_root_cb(char *buffer, void *data) |
bf601689 MH |
973 | { |
974 | struct lxc_list *mountlist, *listentry, *iterator; | |
2c7d90ac | 975 | char *pivotdir, *mountpoint, *mountentry, *saveptr = NULL; |
bf601689 MH |
976 | int found; |
977 | void **cbparm; | |
978 | ||
979 | mountentry = buffer; | |
980 | cbparm = (void **)data; | |
981 | ||
982 | mountlist = cbparm[0]; | |
983 | pivotdir = cbparm[1]; | |
984 | ||
985 | /* parse entry, first field is mountname, ignore */ | |
2796cf79 | 986 | mountpoint = strtok_r(mountentry, " ", &saveptr); |
bf601689 MH |
987 | if (!mountpoint) |
988 | return -1; | |
989 | ||
990 | /* second field is mountpoint */ | |
2796cf79 | 991 | mountpoint = strtok_r(NULL, " ", &saveptr); |
bf601689 MH |
992 | if (!mountpoint) |
993 | return -1; | |
994 | ||
995 | /* only consider mountpoints below old root fs */ | |
996 | if (strncmp(mountpoint, pivotdir, strlen(pivotdir))) | |
997 | return 0; | |
998 | ||
999 | /* filter duplicate mountpoints */ | |
1000 | found = 0; | |
1001 | lxc_list_for_each(iterator, mountlist) { | |
1002 | if (!strcmp(iterator->elem, mountpoint)) { | |
1003 | found = 1; | |
1004 | break; | |
1005 | } | |
1006 | } | |
1007 | if (found) | |
1008 | return 0; | |
1009 | ||
1010 | /* add entry to list */ | |
1011 | listentry = malloc(sizeof(*listentry)); | |
1012 | if (!listentry) { | |
1013 | SYSERROR("malloc for mountpoint listentry failed"); | |
1014 | return -1; | |
1015 | } | |
1016 | ||
1017 | listentry->elem = strdup(mountpoint); | |
1018 | if (!listentry->elem) { | |
1019 | SYSERROR("strdup failed"); | |
00b6be44 | 1020 | free(listentry); |
bf601689 MH |
1021 | return -1; |
1022 | } | |
1023 | lxc_list_add_tail(mountlist, listentry); | |
1024 | ||
1025 | return 0; | |
1026 | } | |
1027 | ||
cc6f6dd7 | 1028 | static int umount_oldrootfs(const char *oldrootfs) |
bf601689 | 1029 | { |
2382ecff | 1030 | char path[MAXPATHLEN]; |
bf601689 | 1031 | void *cbparm[2]; |
9ebb03ad | 1032 | struct lxc_list mountlist, *iterator, *next; |
bf601689 | 1033 | int ok, still_mounted, last_still_mounted; |
9ba8130c | 1034 | int rc; |
bf601689 MH |
1035 | |
1036 | /* read and parse /proc/mounts in old root fs */ | |
1037 | lxc_list_init(&mountlist); | |
1038 | ||
cc6f6dd7 | 1039 | /* oldrootfs is on the top tree directory now */ |
9ba8130c SH |
1040 | rc = snprintf(path, sizeof(path), "/%s", oldrootfs); |
1041 | if (rc >= sizeof(path)) { | |
1042 | ERROR("rootfs name too long"); | |
1043 | return -1; | |
1044 | } | |
bf601689 | 1045 | cbparm[0] = &mountlist; |
bf601689 | 1046 | |
cc6f6dd7 | 1047 | cbparm[1] = strdup(path); |
bf601689 MH |
1048 | if (!cbparm[1]) { |
1049 | SYSERROR("strdup failed"); | |
1050 | return -1; | |
1051 | } | |
1052 | ||
9ba8130c SH |
1053 | rc = snprintf(path, sizeof(path), "%s/proc/mounts", oldrootfs); |
1054 | if (rc >= sizeof(path)) { | |
1055 | ERROR("container proc/mounts name too long"); | |
1056 | return -1; | |
1057 | } | |
cc6f6dd7 DL |
1058 | |
1059 | ok = lxc_file_for_each_line(path, | |
1060 | setup_rootfs_pivot_root_cb, &cbparm); | |
bf601689 MH |
1061 | if (ok < 0) { |
1062 | SYSERROR("failed to read or parse mount list '%s'", path); | |
1063 | return -1; | |
1064 | } | |
1065 | ||
1066 | /* umount filesystems until none left or list no longer shrinks */ | |
1067 | still_mounted = 0; | |
1068 | do { | |
1069 | last_still_mounted = still_mounted; | |
1070 | still_mounted = 0; | |
1071 | ||
9ebb03ad | 1072 | lxc_list_for_each_safe(iterator, &mountlist, next) { |
bf601689 | 1073 | |
c08556c6 | 1074 | /* umount normally */ |
bf601689 MH |
1075 | if (!umount(iterator->elem)) { |
1076 | DEBUG("umounted '%s'", (char *)iterator->elem); | |
1077 | lxc_list_del(iterator); | |
1078 | continue; | |
1079 | } | |
1080 | ||
bf601689 MH |
1081 | still_mounted++; |
1082 | } | |
7df119ee | 1083 | |
bf601689 MH |
1084 | } while (still_mounted > 0 && still_mounted != last_still_mounted); |
1085 | ||
7df119ee | 1086 | |
c08556c6 DL |
1087 | lxc_list_for_each(iterator, &mountlist) { |
1088 | ||
1089 | /* let's try a lazy umount */ | |
1090 | if (!umount2(iterator->elem, MNT_DETACH)) { | |
1091 | INFO("lazy unmount of '%s'", (char *)iterator->elem); | |
1092 | continue; | |
1093 | } | |
1094 | ||
1095 | /* be more brutal (nfs) */ | |
1096 | if (!umount2(iterator->elem, MNT_FORCE)) { | |
1097 | INFO("forced unmount of '%s'", (char *)iterator->elem); | |
1098 | continue; | |
1099 | } | |
1100 | ||
7df119ee | 1101 | WARN("failed to unmount '%s'", (char *)iterator->elem); |
c08556c6 | 1102 | } |
bf601689 | 1103 | |
cc6f6dd7 DL |
1104 | return 0; |
1105 | } | |
1106 | ||
1107 | static int setup_rootfs_pivot_root(const char *rootfs, const char *pivotdir) | |
1108 | { | |
1109 | char path[MAXPATHLEN]; | |
1110 | int remove_pivotdir = 0; | |
9ba8130c | 1111 | int rc; |
cc6f6dd7 DL |
1112 | |
1113 | /* change into new root fs */ | |
1114 | if (chdir(rootfs)) { | |
1115 | SYSERROR("can't chdir to new rootfs '%s'", rootfs); | |
1116 | return -1; | |
1117 | } | |
1118 | ||
1119 | if (!pivotdir) | |
30c5d292 | 1120 | pivotdir = "lxc_putold"; |
cc6f6dd7 | 1121 | |
4f9293b1 | 1122 | /* compute the full path to pivotdir under rootfs */ |
9ba8130c SH |
1123 | rc = snprintf(path, sizeof(path), "%s/%s", rootfs, pivotdir); |
1124 | if (rc >= sizeof(path)) { | |
1125 | ERROR("pivot dir name too long"); | |
1126 | return -1; | |
1127 | } | |
cc6f6dd7 DL |
1128 | |
1129 | if (access(path, F_OK)) { | |
1130 | ||
1131 | if (mkdir_p(path, 0755)) { | |
1132 | SYSERROR("failed to create pivotdir '%s'", path); | |
1133 | return -1; | |
1134 | } | |
1135 | ||
1136 | remove_pivotdir = 1; | |
1137 | DEBUG("created '%s' directory", path); | |
1138 | } | |
1139 | ||
1140 | DEBUG("mountpoint for old rootfs is '%s'", path); | |
1141 | ||
1142 | /* pivot_root into our new root fs */ | |
1143 | if (pivot_root(".", path)) { | |
1144 | SYSERROR("pivot_root syscall failed"); | |
bf601689 MH |
1145 | return -1; |
1146 | } | |
cc6f6dd7 DL |
1147 | |
1148 | if (chdir("/")) { | |
1149 | SYSERROR("can't chdir to / after pivot_root"); | |
1150 | return -1; | |
1151 | } | |
1152 | ||
1153 | DEBUG("pivot_root syscall to '%s' successful", rootfs); | |
1154 | ||
1155 | /* we switch from absolute path to relative path */ | |
1156 | if (umount_oldrootfs(pivotdir)) | |
1157 | return -1; | |
bf601689 | 1158 | |
c08556c6 DL |
1159 | /* remove temporary mount point, we don't consider the removing |
1160 | * as fatal */ | |
a91d897a FW |
1161 | if (remove_pivotdir && rmdir(pivotdir)) |
1162 | WARN("can't remove mountpoint '%s': %m", pivotdir); | |
bf601689 | 1163 | |
bf601689 MH |
1164 | return 0; |
1165 | } | |
1166 | ||
91c3830e SH |
1167 | /* |
1168 | * Do we want to add options for max size of /dev and a file to | |
1169 | * specify which devices to create? | |
1170 | */ | |
1171 | static int mount_autodev(char *root) | |
1172 | { | |
1173 | int ret; | |
1174 | char path[MAXPATHLEN]; | |
1175 | ||
1176 | INFO("Mounting /dev under %s\n", root); | |
1177 | ret = snprintf(path, MAXPATHLEN, "%s/dev", root); | |
1178 | if (ret < 0 || ret > MAXPATHLEN) | |
1179 | return -1; | |
1180 | ret = mount("none", path, "tmpfs", 0, "size=100000"); | |
1181 | if (ret) { | |
1182 | SYSERROR("Failed to mount /dev at %s\n", root); | |
1183 | return -1; | |
1184 | } | |
1185 | ret = snprintf(path, MAXPATHLEN, "%s/dev/pts", root); | |
1186 | if (ret < 0 || ret >= MAXPATHLEN) | |
1187 | return -1; | |
1188 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); | |
1189 | if (ret) { | |
1190 | SYSERROR("Failed to create /dev/pts in container"); | |
1191 | return -1; | |
1192 | } | |
1193 | ||
1194 | INFO("Mounted /dev under %s\n", root); | |
1195 | return 0; | |
1196 | } | |
1197 | ||
c6883f38 SH |
1198 | struct lxc_devs { |
1199 | char *name; | |
1200 | mode_t mode; | |
1201 | int maj; | |
1202 | int min; | |
1203 | }; | |
1204 | ||
1205 | struct lxc_devs lxc_devs[] = { | |
1206 | { "null", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 3 }, | |
1207 | { "zero", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 5 }, | |
1208 | { "full", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 7 }, | |
1209 | { "urandom", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 9 }, | |
1210 | { "random", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 8 }, | |
1211 | { "tty", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 5, 0 }, | |
1212 | { "console", S_IFCHR | S_IRUSR | S_IWUSR, 5, 1 }, | |
1213 | }; | |
1214 | ||
c6883f38 SH |
1215 | static int setup_autodev(char *root) |
1216 | { | |
1217 | int ret; | |
1218 | struct lxc_devs *d; | |
1219 | char path[MAXPATHLEN]; | |
1220 | int i; | |
3a32201c | 1221 | mode_t cmask; |
c6883f38 | 1222 | |
91c3830e SH |
1223 | INFO("Creating initial consoles under %s/dev\n", root); |
1224 | ||
c6883f38 | 1225 | ret = snprintf(path, MAXPATHLEN, "%s/dev", root); |
91c3830e SH |
1226 | if (ret < 0 || ret >= MAXPATHLEN) { |
1227 | ERROR("Error calculating container /dev location"); | |
c6883f38 | 1228 | return -1; |
f7bee6c6 | 1229 | } |
91c3830e SH |
1230 | |
1231 | INFO("Populating /dev under %s\n", root); | |
3a32201c | 1232 | cmask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
c6883f38 SH |
1233 | for (i = 0; i < sizeof(lxc_devs) / sizeof(lxc_devs[0]); i++) { |
1234 | d = &lxc_devs[i]; | |
1235 | ret = snprintf(path, MAXPATHLEN, "%s/dev/%s", root, d->name); | |
1236 | if (ret < 0 || ret >= MAXPATHLEN) | |
1237 | return -1; | |
1238 | ret = mknod(path, d->mode, makedev(d->maj, d->min)); | |
91c3830e | 1239 | if (ret && errno != EEXIST) { |
c6883f38 SH |
1240 | SYSERROR("Error creating %s\n", d->name); |
1241 | return -1; | |
1242 | } | |
1243 | } | |
3a32201c | 1244 | umask(cmask); |
c6883f38 SH |
1245 | |
1246 | INFO("Populated /dev under %s\n", root); | |
1247 | return 0; | |
1248 | } | |
1249 | ||
cc28d0b0 SH |
1250 | /* |
1251 | * Detect whether / is mounted MS_SHARED. The only way I know of to | |
1252 | * check that is through /proc/self/mountinfo. | |
1253 | * I'm only checking for /. If the container rootfs or mount location | |
1254 | * is MS_SHARED, but not '/', then you're out of luck - figuring that | |
1255 | * out would be too much work to be worth it. | |
1256 | */ | |
1257 | #define LINELEN 4096 | |
1258 | int detect_shared_rootfs(void) | |
1259 | { | |
1260 | char buf[LINELEN], *p; | |
1261 | FILE *f; | |
1262 | int i; | |
1263 | char *p2; | |
1264 | ||
025ed0f3 | 1265 | process_lock(); |
cc28d0b0 | 1266 | f = fopen("/proc/self/mountinfo", "r"); |
025ed0f3 | 1267 | process_unlock(); |
cc28d0b0 SH |
1268 | if (!f) |
1269 | return 0; | |
1270 | while ((p = fgets(buf, LINELEN, f))) { | |
cc28d0b0 SH |
1271 | for (p = buf, i=0; p && i < 4; i++) |
1272 | p = index(p+1, ' '); | |
1273 | if (!p) | |
1274 | continue; | |
1275 | p2 = index(p+1, ' '); | |
1276 | if (!p2) | |
1277 | continue; | |
1278 | *p2 = '\0'; | |
cc28d0b0 SH |
1279 | if (strcmp(p+1, "/") == 0) { |
1280 | // this is '/'. is it shared? | |
1281 | p = index(p2+1, ' '); | |
ab81cef0 | 1282 | if (p && strstr(p, "shared:")) { |
025ed0f3 | 1283 | process_lock(); |
00b6be44 | 1284 | fclose(f); |
025ed0f3 | 1285 | process_unlock(); |
cc28d0b0 | 1286 | return 1; |
00b6be44 | 1287 | } |
cc28d0b0 SH |
1288 | } |
1289 | } | |
025ed0f3 | 1290 | process_lock(); |
cc28d0b0 | 1291 | fclose(f); |
025ed0f3 | 1292 | process_unlock(); |
cc28d0b0 SH |
1293 | return 0; |
1294 | } | |
1295 | ||
1296 | /* | |
1297 | * I'll forgive you for asking whether all of this is needed :) The | |
1298 | * answer is yes. | |
1299 | * pivot_root will fail if the new root, the put_old dir, or the parent | |
1300 | * of current->fs->root are MS_SHARED. (parent of current->fs_root may | |
1301 | * or may not be current->fs_root - if we assumed it always was, we could | |
1302 | * just mount --make-rslave /). So, | |
1303 | * 1. mount a tiny tmpfs to be parent of current->fs->root. | |
1304 | * 2. make that MS_SLAVE | |
1305 | * 3. make a 'root' directory under that | |
1306 | * 4. mount --rbind / under the $tinyroot/root. | |
1307 | * 5. make that rslave | |
1308 | * 6. chdir and chroot into $tinyroot/root | |
1309 | * 7. $tinyroot will be unmounted by our parent in start.c | |
1310 | */ | |
1311 | static int chroot_into_slave(struct lxc_conf *conf) | |
1312 | { | |
1313 | char path[MAXPATHLEN]; | |
1314 | const char *destpath = conf->rootfs.mount; | |
1315 | int ret; | |
1316 | ||
1317 | if (mount(destpath, destpath, NULL, MS_BIND, 0)) { | |
1318 | SYSERROR("failed to mount %s bind", destpath); | |
1319 | return -1; | |
1320 | } | |
1321 | if (mount("", destpath, NULL, MS_SLAVE, 0)) { | |
1322 | SYSERROR("failed to make %s slave", destpath); | |
1323 | return -1; | |
1324 | } | |
1325 | if (mount("none", destpath, "tmpfs", 0, "size=10000")) { | |
1326 | SYSERROR("Failed to mount tmpfs / at %s", destpath); | |
1327 | return -1; | |
1328 | } | |
1329 | ret = snprintf(path, MAXPATHLEN, "%s/root", destpath); | |
1330 | if (ret < 0 || ret >= MAXPATHLEN) { | |
1331 | ERROR("out of memory making root path"); | |
1332 | return -1; | |
1333 | } | |
1334 | if (mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH)) { | |
1335 | SYSERROR("Failed to create /dev/pts in container"); | |
1336 | return -1; | |
1337 | } | |
1338 | if (mount("/", path, NULL, MS_BIND|MS_REC, 0)) { | |
1339 | SYSERROR("Failed to rbind mount / to %s", path); | |
1340 | return -1; | |
1341 | } | |
1342 | if (mount("", destpath, NULL, MS_SLAVE|MS_REC, 0)) { | |
1343 | SYSERROR("Failed to make tmp-/ at %s rslave", path); | |
1344 | return -1; | |
1345 | } | |
1346 | if (chdir(path)) { | |
1347 | SYSERROR("Failed to chdir into tmp-/"); | |
1348 | return -1; | |
1349 | } | |
1350 | if (chroot(path)) { | |
1351 | SYSERROR("Failed to chroot into tmp-/"); | |
1352 | return -1; | |
1353 | } | |
1354 | INFO("Chrooted into tmp-/ at %s\n", path); | |
1355 | return 0; | |
1356 | } | |
1357 | ||
1358 | static int setup_rootfs(struct lxc_conf *conf) | |
0ad19a3f | 1359 | { |
cc28d0b0 SH |
1360 | const struct lxc_rootfs *rootfs = &conf->rootfs; |
1361 | ||
a0f379bf DW |
1362 | if (!rootfs->path) { |
1363 | if (mount("", "/", NULL, MS_SLAVE|MS_REC, 0)) { | |
1364 | SYSERROR("Failed to make / rslave"); | |
1365 | return -1; | |
1366 | } | |
c69bd12f | 1367 | return 0; |
a0f379bf | 1368 | } |
0ad19a3f | 1369 | |
12297168 | 1370 | if (access(rootfs->mount, F_OK)) { |
b1789442 | 1371 | SYSERROR("failed to access to '%s', check it is present", |
12297168 | 1372 | rootfs->mount); |
b1789442 DL |
1373 | return -1; |
1374 | } | |
1375 | ||
cc28d0b0 SH |
1376 | if (detect_shared_rootfs()) { |
1377 | if (chroot_into_slave(conf)) { | |
1378 | ERROR("Failed to chroot into slave /"); | |
1379 | return -1; | |
1380 | } | |
1381 | } | |
1382 | ||
9be53773 SH |
1383 | // First try mounting rootfs using a bdev |
1384 | struct bdev *bdev = bdev_init(rootfs->path, rootfs->mount, NULL); | |
1385 | if (bdev && bdev->ops->mount(bdev) == 0) { | |
59d66af2 | 1386 | bdev_put(bdev); |
9be53773 SH |
1387 | DEBUG("mounted '%s' on '%s'", rootfs->path, rootfs->mount); |
1388 | return 0; | |
1389 | } | |
59d66af2 SH |
1390 | if (bdev) |
1391 | bdev_put(bdev); | |
2656d231 | 1392 | if (mount_rootfs(rootfs->path, rootfs->mount)) { |
a6afdde9 | 1393 | ERROR("failed to mount rootfs"); |
c3f0a28c | 1394 | return -1; |
1395 | } | |
0ad19a3f | 1396 | |
12297168 | 1397 | DEBUG("mounted '%s' on '%s'", rootfs->path, rootfs->mount); |
c69bd12f | 1398 | |
ac778708 DL |
1399 | return 0; |
1400 | } | |
1401 | ||
1402 | int setup_pivot_root(const struct lxc_rootfs *rootfs) | |
1403 | { | |
ac778708 DL |
1404 | if (!rootfs->path) |
1405 | return 0; | |
1406 | ||
12297168 | 1407 | if (setup_rootfs_pivot_root(rootfs->mount, rootfs->pivot)) { |
cc6f6dd7 | 1408 | ERROR("failed to setup pivot root"); |
25368b52 | 1409 | return -1; |
c69bd12f DL |
1410 | } |
1411 | ||
25368b52 | 1412 | return 0; |
0ad19a3f | 1413 | } |
1414 | ||
d852c78c | 1415 | static int setup_pts(int pts) |
3c26f34e | 1416 | { |
77890c6d SW |
1417 | char target[PATH_MAX]; |
1418 | ||
d852c78c DL |
1419 | if (!pts) |
1420 | return 0; | |
3c26f34e | 1421 | |
1422 | if (!access("/dev/pts/ptmx", F_OK) && umount("/dev/pts")) { | |
36eb9bde | 1423 | SYSERROR("failed to umount 'dev/pts'"); |
3c26f34e | 1424 | return -1; |
1425 | } | |
1426 | ||
a6afdde9 | 1427 | if (mount("devpts", "/dev/pts", "devpts", MS_MGC_VAL, |
67e5a20a | 1428 | "newinstance,ptmxmode=0666,mode=0620,gid=5")) { |
36eb9bde | 1429 | SYSERROR("failed to mount a new instance of '/dev/pts'"); |
3c26f34e | 1430 | return -1; |
1431 | } | |
1432 | ||
3c26f34e | 1433 | if (access("/dev/ptmx", F_OK)) { |
1434 | if (!symlink("/dev/pts/ptmx", "/dev/ptmx")) | |
1435 | goto out; | |
36eb9bde | 1436 | SYSERROR("failed to symlink '/dev/pts/ptmx'->'/dev/ptmx'"); |
3c26f34e | 1437 | return -1; |
1438 | } | |
1439 | ||
77890c6d SW |
1440 | if (realpath("/dev/ptmx", target) && !strcmp(target, "/dev/pts/ptmx")) |
1441 | goto out; | |
1442 | ||
3c26f34e | 1443 | /* fallback here, /dev/pts/ptmx exists just mount bind */ |
1444 | if (mount("/dev/pts/ptmx", "/dev/ptmx", "none", MS_BIND, 0)) { | |
36eb9bde | 1445 | SYSERROR("mount failed '/dev/pts/ptmx'->'/dev/ptmx'"); |
3c26f34e | 1446 | return -1; |
1447 | } | |
cd54d859 DL |
1448 | |
1449 | INFO("created new pts instance"); | |
d852c78c | 1450 | |
3c26f34e | 1451 | out: |
1452 | return 0; | |
1453 | } | |
1454 | ||
cccc74b5 DL |
1455 | static int setup_personality(int persona) |
1456 | { | |
6ff05e18 | 1457 | #if HAVE_SYS_PERSONALITY_H |
cccc74b5 DL |
1458 | if (persona == -1) |
1459 | return 0; | |
1460 | ||
1461 | if (personality(persona) < 0) { | |
1462 | SYSERROR("failed to set personality to '0x%x'", persona); | |
1463 | return -1; | |
1464 | } | |
1465 | ||
1466 | INFO("set personality to '0x%x'", persona); | |
6ff05e18 | 1467 | #endif |
cccc74b5 DL |
1468 | |
1469 | return 0; | |
1470 | } | |
1471 | ||
7c6ef2a2 | 1472 | static int setup_dev_console(const struct lxc_rootfs *rootfs, |
33fcb7a0 | 1473 | const struct lxc_console *console) |
6e590161 | 1474 | { |
63376d7d DL |
1475 | char path[MAXPATHLEN]; |
1476 | struct stat s; | |
7c6ef2a2 | 1477 | int ret; |
52e35957 | 1478 | |
7c6ef2a2 SH |
1479 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs->mount); |
1480 | if (ret >= sizeof(path)) { | |
1481 | ERROR("console path too long\n"); | |
1482 | return -1; | |
1483 | } | |
52e35957 | 1484 | |
63376d7d | 1485 | if (access(path, F_OK)) { |
466978b0 | 1486 | WARN("rootfs specified but no console found at '%s'", path); |
63376d7d | 1487 | return 0; |
52e35957 DL |
1488 | } |
1489 | ||
b5159817 DE |
1490 | if (console->master < 0) { |
1491 | INFO("no console"); | |
f78a1f32 DL |
1492 | return 0; |
1493 | } | |
ed502555 | 1494 | |
63376d7d DL |
1495 | if (stat(path, &s)) { |
1496 | SYSERROR("failed to stat '%s'", path); | |
1497 | return -1; | |
1498 | } | |
1499 | ||
1500 | if (chmod(console->name, s.st_mode)) { | |
1501 | SYSERROR("failed to set mode '0%o' to '%s'", | |
1502 | s.st_mode, console->name); | |
1503 | return -1; | |
1504 | } | |
13954cce | 1505 | |
63376d7d DL |
1506 | if (mount(console->name, path, "none", MS_BIND, 0)) { |
1507 | ERROR("failed to mount '%s' on '%s'", console->name, path); | |
6e590161 | 1508 | return -1; |
1509 | } | |
1510 | ||
63376d7d | 1511 | INFO("console has been setup"); |
7c6ef2a2 SH |
1512 | return 0; |
1513 | } | |
1514 | ||
1515 | static int setup_ttydir_console(const struct lxc_rootfs *rootfs, | |
1516 | const struct lxc_console *console, | |
1517 | char *ttydir) | |
1518 | { | |
1519 | char path[MAXPATHLEN], lxcpath[MAXPATHLEN]; | |
1520 | int ret; | |
1521 | ||
1522 | /* create rootfs/dev/<ttydir> directory */ | |
1523 | ret = snprintf(path, sizeof(path), "%s/dev/%s", rootfs->mount, | |
1524 | ttydir); | |
1525 | if (ret >= sizeof(path)) | |
1526 | return -1; | |
1527 | ret = mkdir(path, 0755); | |
1528 | if (ret && errno != EEXIST) { | |
1529 | SYSERROR("failed with errno %d to create %s\n", errno, path); | |
1530 | return -1; | |
1531 | } | |
1532 | INFO("created %s\n", path); | |
1533 | ||
1534 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/dev/%s/console", | |
1535 | rootfs->mount, ttydir); | |
1536 | if (ret >= sizeof(lxcpath)) { | |
1537 | ERROR("console path too long\n"); | |
1538 | return -1; | |
1539 | } | |
1540 | ||
1541 | snprintf(path, sizeof(path), "%s/dev/console", rootfs->mount); | |
1542 | ret = unlink(path); | |
1543 | if (ret && errno != ENOENT) { | |
1544 | SYSERROR("error unlinking %s\n", path); | |
1545 | return -1; | |
1546 | } | |
1547 | ||
025ed0f3 | 1548 | process_lock(); |
7c6ef2a2 | 1549 | ret = creat(lxcpath, 0660); |
025ed0f3 | 1550 | process_unlock(); |
7c6ef2a2 SH |
1551 | if (ret==-1 && errno != EEXIST) { |
1552 | SYSERROR("error %d creating %s\n", errno, lxcpath); | |
1553 | return -1; | |
1554 | } | |
025ed0f3 | 1555 | process_lock(); |
4d44e274 SH |
1556 | if (ret >= 0) |
1557 | close(ret); | |
025ed0f3 | 1558 | process_unlock(); |
7c6ef2a2 | 1559 | |
b5159817 DE |
1560 | if (console->master < 0) { |
1561 | INFO("no console"); | |
7c6ef2a2 SH |
1562 | return 0; |
1563 | } | |
1564 | ||
1565 | if (mount(console->name, lxcpath, "none", MS_BIND, 0)) { | |
1566 | ERROR("failed to mount '%s' on '%s'", console->name, lxcpath); | |
1567 | return -1; | |
1568 | } | |
1569 | ||
1570 | /* create symlink from rootfs/dev/console to 'lxc/console' */ | |
9ba8130c SH |
1571 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/console", ttydir); |
1572 | if (ret >= sizeof(lxcpath)) { | |
1573 | ERROR("lxc/console path too long"); | |
1574 | return -1; | |
1575 | } | |
7c6ef2a2 SH |
1576 | ret = symlink(lxcpath, path); |
1577 | if (ret) { | |
1578 | SYSERROR("failed to create symlink for console"); | |
1579 | return -1; | |
1580 | } | |
1581 | ||
1582 | INFO("console has been setup on %s", lxcpath); | |
cd54d859 | 1583 | |
6e590161 | 1584 | return 0; |
1585 | } | |
1586 | ||
7c6ef2a2 SH |
1587 | static int setup_console(const struct lxc_rootfs *rootfs, |
1588 | const struct lxc_console *console, | |
1589 | char *ttydir) | |
1590 | { | |
1591 | /* We don't have a rootfs, /dev/console will be shared */ | |
1592 | if (!rootfs->path) | |
1593 | return 0; | |
1594 | if (!ttydir) | |
1595 | return setup_dev_console(rootfs, console); | |
1596 | ||
1597 | return setup_ttydir_console(rootfs, console, ttydir); | |
1598 | } | |
1599 | ||
1bd051a6 SH |
1600 | static int setup_kmsg(const struct lxc_rootfs *rootfs, |
1601 | const struct lxc_console *console) | |
1602 | { | |
1603 | char kpath[MAXPATHLEN]; | |
1604 | int ret; | |
1605 | ||
222fea5a DE |
1606 | if (!rootfs->path) |
1607 | return 0; | |
1bd051a6 SH |
1608 | ret = snprintf(kpath, sizeof(kpath), "%s/dev/kmsg", rootfs->mount); |
1609 | if (ret < 0 || ret >= sizeof(kpath)) | |
1610 | return -1; | |
1611 | ||
1612 | ret = unlink(kpath); | |
1613 | if (ret && errno != ENOENT) { | |
1614 | SYSERROR("error unlinking %s\n", kpath); | |
1615 | return -1; | |
1616 | } | |
1617 | ||
1618 | ret = symlink("console", kpath); | |
1619 | if (ret) { | |
1620 | SYSERROR("failed to create symlink for kmsg"); | |
1621 | return -1; | |
1622 | } | |
1623 | ||
1624 | return 0; | |
1625 | } | |
1626 | ||
998ac676 RT |
1627 | static void parse_mntopt(char *opt, unsigned long *flags, char **data) |
1628 | { | |
1629 | struct mount_opt *mo; | |
1630 | ||
1631 | /* If opt is found in mount_opt, set or clear flags. | |
1632 | * Otherwise append it to data. */ | |
1633 | ||
1634 | for (mo = &mount_opt[0]; mo->name != NULL; mo++) { | |
1635 | if (!strncmp(opt, mo->name, strlen(mo->name))) { | |
1636 | if (mo->clear) | |
1637 | *flags &= ~mo->flag; | |
1638 | else | |
1639 | *flags |= mo->flag; | |
1640 | return; | |
1641 | } | |
1642 | } | |
1643 | ||
1644 | if (strlen(*data)) | |
1645 | strcat(*data, ","); | |
1646 | strcat(*data, opt); | |
1647 | } | |
1648 | ||
911324ef | 1649 | static int parse_mntopts(const char *mntopts, unsigned long *mntflags, |
998ac676 RT |
1650 | char **mntdata) |
1651 | { | |
1652 | char *s, *data; | |
1653 | char *p, *saveptr = NULL; | |
1654 | ||
911324ef | 1655 | *mntdata = NULL; |
91656ce5 | 1656 | *mntflags = 0L; |
911324ef DL |
1657 | |
1658 | if (!mntopts) | |
998ac676 RT |
1659 | return 0; |
1660 | ||
911324ef | 1661 | s = strdup(mntopts); |
998ac676 | 1662 | if (!s) { |
36eb9bde | 1663 | SYSERROR("failed to allocate memory"); |
998ac676 RT |
1664 | return -1; |
1665 | } | |
1666 | ||
1667 | data = malloc(strlen(s) + 1); | |
1668 | if (!data) { | |
36eb9bde | 1669 | SYSERROR("failed to allocate memory"); |
998ac676 RT |
1670 | free(s); |
1671 | return -1; | |
1672 | } | |
1673 | *data = 0; | |
1674 | ||
1675 | for (p = strtok_r(s, ",", &saveptr); p != NULL; | |
1676 | p = strtok_r(NULL, ",", &saveptr)) | |
1677 | parse_mntopt(p, mntflags, &data); | |
1678 | ||
1679 | if (*data) | |
1680 | *mntdata = data; | |
1681 | else | |
1682 | free(data); | |
1683 | free(s); | |
1684 | ||
1685 | return 0; | |
1686 | } | |
1687 | ||
911324ef DL |
1688 | static int mount_entry(const char *fsname, const char *target, |
1689 | const char *fstype, unsigned long mountflags, | |
1690 | const char *data) | |
1691 | { | |
1692 | if (mount(fsname, target, fstype, mountflags & ~MS_REMOUNT, data)) { | |
1693 | SYSERROR("failed to mount '%s' on '%s'", fsname, target); | |
1694 | return -1; | |
1695 | } | |
1696 | ||
1697 | if ((mountflags & MS_REMOUNT) || (mountflags & MS_BIND)) { | |
1698 | ||
1699 | DEBUG("remounting %s on %s to respect bind or remount options", | |
1700 | fsname, target); | |
1701 | ||
1702 | if (mount(fsname, target, fstype, | |
1703 | mountflags | MS_REMOUNT, data)) { | |
1704 | SYSERROR("failed to mount '%s' on '%s'", | |
1705 | fsname, target); | |
1706 | return -1; | |
1707 | } | |
1708 | } | |
1709 | ||
1710 | DEBUG("mounted '%s' on '%s', type '%s'", fsname, target, fstype); | |
1711 | ||
1712 | return 0; | |
1713 | } | |
1714 | ||
1715 | static inline int mount_entry_on_systemfs(struct mntent *mntent) | |
0ad19a3f | 1716 | { |
998ac676 RT |
1717 | unsigned long mntflags; |
1718 | char *mntdata; | |
911324ef DL |
1719 | int ret; |
1720 | ||
1721 | if (parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata) < 0) { | |
1722 | ERROR("failed to parse mount option '%s'", mntent->mnt_opts); | |
1723 | return -1; | |
1724 | } | |
1725 | ||
1726 | ret = mount_entry(mntent->mnt_fsname, mntent->mnt_dir, | |
1727 | mntent->mnt_type, mntflags, mntdata); | |
1728 | ||
68c152ef SH |
1729 | if (hasmntopt(mntent, "optional") != NULL) |
1730 | ret = 0; | |
1731 | ||
911324ef DL |
1732 | free(mntdata); |
1733 | ||
1734 | return ret; | |
1735 | } | |
1736 | ||
1737 | static int mount_entry_on_absolute_rootfs(struct mntent *mntent, | |
80a881b2 SH |
1738 | const struct lxc_rootfs *rootfs, |
1739 | const char *lxc_name) | |
911324ef | 1740 | { |
013bd428 | 1741 | char *aux; |
59760f5d | 1742 | char path[MAXPATHLEN]; |
911324ef DL |
1743 | unsigned long mntflags; |
1744 | char *mntdata; | |
80a881b2 | 1745 | int r, ret = 0, offset; |
67e571de | 1746 | const char *lxcpath; |
0ad19a3f | 1747 | |
911324ef DL |
1748 | if (parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata) < 0) { |
1749 | ERROR("failed to parse mount option '%s'", mntent->mnt_opts); | |
1750 | return -1; | |
1751 | } | |
1bc60a65 | 1752 | |
2a59a681 SH |
1753 | lxcpath = default_lxc_path(); |
1754 | if (!lxcpath) { | |
1755 | ERROR("Out of memory"); | |
1756 | return -1; | |
1757 | } | |
1758 | ||
80a881b2 | 1759 | /* if rootfs->path is a blockdev path, allow container fstab to |
2a59a681 SH |
1760 | * use $lxcpath/CN/rootfs as the target prefix */ |
1761 | r = snprintf(path, MAXPATHLEN, "%s/%s/rootfs", lxcpath, lxc_name); | |
80a881b2 SH |
1762 | if (r < 0 || r >= MAXPATHLEN) |
1763 | goto skipvarlib; | |
1764 | ||
1765 | aux = strstr(mntent->mnt_dir, path); | |
1766 | if (aux) { | |
1767 | offset = strlen(path); | |
1768 | goto skipabs; | |
1769 | } | |
1770 | ||
1771 | skipvarlib: | |
013bd428 DL |
1772 | aux = strstr(mntent->mnt_dir, rootfs->path); |
1773 | if (!aux) { | |
1774 | WARN("ignoring mount point '%s'", mntent->mnt_dir); | |
1775 | goto out; | |
1776 | } | |
80a881b2 SH |
1777 | offset = strlen(rootfs->path); |
1778 | ||
1779 | skipabs: | |
013bd428 | 1780 | |
9ba8130c | 1781 | r = snprintf(path, MAXPATHLEN, "%s/%s", rootfs->mount, |
80a881b2 SH |
1782 | aux + offset); |
1783 | if (r < 0 || r >= MAXPATHLEN) { | |
1784 | WARN("pathnme too long for '%s'", mntent->mnt_dir); | |
1785 | ret = -1; | |
1786 | goto out; | |
1787 | } | |
1788 | ||
d330fe7b | 1789 | |
013bd428 | 1790 | ret = mount_entry(mntent->mnt_fsname, path, mntent->mnt_type, |
911324ef | 1791 | mntflags, mntdata); |
0ad19a3f | 1792 | |
68c152ef SH |
1793 | if (hasmntopt(mntent, "optional") != NULL) |
1794 | ret = 0; | |
1795 | ||
013bd428 | 1796 | out: |
911324ef DL |
1797 | free(mntdata); |
1798 | return ret; | |
1799 | } | |
d330fe7b | 1800 | |
911324ef DL |
1801 | static int mount_entry_on_relative_rootfs(struct mntent *mntent, |
1802 | const char *rootfs) | |
1803 | { | |
1804 | char path[MAXPATHLEN]; | |
1805 | unsigned long mntflags; | |
1806 | char *mntdata; | |
1807 | int ret; | |
d330fe7b | 1808 | |
911324ef DL |
1809 | if (parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata) < 0) { |
1810 | ERROR("failed to parse mount option '%s'", mntent->mnt_opts); | |
1811 | return -1; | |
1812 | } | |
d330fe7b | 1813 | |
911324ef | 1814 | /* relative to root mount point */ |
9ba8130c SH |
1815 | ret = snprintf(path, sizeof(path), "%s/%s", rootfs, mntent->mnt_dir); |
1816 | if (ret >= sizeof(path)) { | |
1817 | ERROR("path name too long"); | |
1818 | return -1; | |
1819 | } | |
911324ef DL |
1820 | |
1821 | ret = mount_entry(mntent->mnt_fsname, path, mntent->mnt_type, | |
1822 | mntflags, mntdata); | |
1823 | ||
68c152ef SH |
1824 | if (hasmntopt(mntent, "optional") != NULL) |
1825 | ret = 0; | |
1826 | ||
911324ef | 1827 | free(mntdata); |
998ac676 | 1828 | |
911324ef DL |
1829 | return ret; |
1830 | } | |
1831 | ||
80a881b2 SH |
1832 | static int mount_file_entries(const struct lxc_rootfs *rootfs, FILE *file, |
1833 | const char *lxc_name) | |
911324ef DL |
1834 | { |
1835 | struct mntent *mntent; | |
1836 | int ret = -1; | |
e76b8764 | 1837 | |
911324ef | 1838 | while ((mntent = getmntent(file))) { |
e76b8764 | 1839 | |
911324ef DL |
1840 | if (!rootfs->path) { |
1841 | if (mount_entry_on_systemfs(mntent)) | |
e76b8764 | 1842 | goto out; |
911324ef | 1843 | continue; |
e76b8764 CDC |
1844 | } |
1845 | ||
911324ef DL |
1846 | /* We have a separate root, mounts are relative to it */ |
1847 | if (mntent->mnt_dir[0] != '/') { | |
1848 | if (mount_entry_on_relative_rootfs(mntent, | |
1849 | rootfs->mount)) | |
1850 | goto out; | |
1851 | continue; | |
1852 | } | |
cd54d859 | 1853 | |
80a881b2 | 1854 | if (mount_entry_on_absolute_rootfs(mntent, rootfs, lxc_name)) |
911324ef | 1855 | goto out; |
0ad19a3f | 1856 | } |
cd54d859 | 1857 | |
0ad19a3f | 1858 | ret = 0; |
cd54d859 DL |
1859 | |
1860 | INFO("mount points have been setup"); | |
0ad19a3f | 1861 | out: |
e7938e9e MN |
1862 | return ret; |
1863 | } | |
1864 | ||
80a881b2 SH |
1865 | static int setup_mount(const struct lxc_rootfs *rootfs, const char *fstab, |
1866 | const char *lxc_name) | |
e7938e9e MN |
1867 | { |
1868 | FILE *file; | |
1869 | int ret; | |
1870 | ||
1871 | if (!fstab) | |
1872 | return 0; | |
1873 | ||
025ed0f3 | 1874 | process_lock(); |
e7938e9e | 1875 | file = setmntent(fstab, "r"); |
025ed0f3 | 1876 | process_unlock(); |
e7938e9e MN |
1877 | if (!file) { |
1878 | SYSERROR("failed to use '%s'", fstab); | |
1879 | return -1; | |
1880 | } | |
1881 | ||
80a881b2 | 1882 | ret = mount_file_entries(rootfs, file, lxc_name); |
e7938e9e | 1883 | |
025ed0f3 | 1884 | process_lock(); |
0ad19a3f | 1885 | endmntent(file); |
025ed0f3 | 1886 | process_unlock(); |
0ad19a3f | 1887 | return ret; |
1888 | } | |
1889 | ||
80a881b2 SH |
1890 | static int setup_mount_entries(const struct lxc_rootfs *rootfs, struct lxc_list *mount, |
1891 | const char *lxc_name) | |
e7938e9e MN |
1892 | { |
1893 | FILE *file; | |
1894 | struct lxc_list *iterator; | |
1895 | char *mount_entry; | |
1896 | int ret; | |
1897 | ||
025ed0f3 | 1898 | process_lock(); |
e7938e9e | 1899 | file = tmpfile(); |
025ed0f3 | 1900 | process_unlock(); |
e7938e9e MN |
1901 | if (!file) { |
1902 | ERROR("tmpfile error: %m"); | |
1903 | return -1; | |
1904 | } | |
1905 | ||
1906 | lxc_list_for_each(iterator, mount) { | |
1907 | mount_entry = iterator->elem; | |
1d6b1976 | 1908 | fprintf(file, "%s\n", mount_entry); |
e7938e9e MN |
1909 | } |
1910 | ||
1911 | rewind(file); | |
1912 | ||
80a881b2 | 1913 | ret = mount_file_entries(rootfs, file, lxc_name); |
e7938e9e | 1914 | |
025ed0f3 | 1915 | process_lock(); |
e7938e9e | 1916 | fclose(file); |
025ed0f3 | 1917 | process_unlock(); |
e7938e9e MN |
1918 | return ret; |
1919 | } | |
1920 | ||
81810dd1 DL |
1921 | static int setup_caps(struct lxc_list *caps) |
1922 | { | |
1923 | struct lxc_list *iterator; | |
1924 | char *drop_entry; | |
d55bc1ad | 1925 | char *ptr; |
81810dd1 DL |
1926 | int i, capid; |
1927 | ||
1928 | lxc_list_for_each(iterator, caps) { | |
1929 | ||
1930 | drop_entry = iterator->elem; | |
1931 | ||
1932 | capid = -1; | |
1933 | ||
1934 | for (i = 0; i < sizeof(caps_opt)/sizeof(caps_opt[0]); i++) { | |
1935 | ||
1936 | if (strcmp(drop_entry, caps_opt[i].name)) | |
1937 | continue; | |
1938 | ||
1939 | capid = caps_opt[i].value; | |
1940 | break; | |
1941 | } | |
1942 | ||
d55bc1ad CS |
1943 | if (capid < 0) { |
1944 | /* try to see if it's numeric, so the user may specify | |
1945 | * capabilities that the running kernel knows about but | |
1946 | * we don't */ | |
09bbd745 | 1947 | errno = 0; |
d55bc1ad | 1948 | capid = strtol(drop_entry, &ptr, 10); |
09bbd745 | 1949 | if (!ptr || *ptr != '\0' || errno != 0) |
d55bc1ad CS |
1950 | /* not a valid number */ |
1951 | capid = -1; | |
1952 | else if (capid > lxc_caps_last_cap()) | |
1953 | /* we have a number but it's not a valid | |
1954 | * capability */ | |
1955 | capid = -1; | |
1956 | } | |
1957 | ||
81810dd1 | 1958 | if (capid < 0) { |
1e11be34 DL |
1959 | ERROR("unknown capability %s", drop_entry); |
1960 | return -1; | |
81810dd1 DL |
1961 | } |
1962 | ||
1963 | DEBUG("drop capability '%s' (%d)", drop_entry, capid); | |
1964 | ||
1965 | if (prctl(PR_CAPBSET_DROP, capid, 0, 0, 0)) { | |
1966 | SYSERROR("failed to remove %s capability", drop_entry); | |
1967 | return -1; | |
1968 | } | |
1969 | ||
1970 | } | |
1971 | ||
1fb86a7c SH |
1972 | DEBUG("capabilities have been setup"); |
1973 | ||
1974 | return 0; | |
1975 | } | |
1976 | ||
1977 | static int dropcaps_except(struct lxc_list *caps) | |
1978 | { | |
1979 | struct lxc_list *iterator; | |
1980 | char *keep_entry; | |
1981 | char *ptr; | |
1982 | int i, capid; | |
1983 | int numcaps = lxc_caps_last_cap() + 1; | |
1984 | INFO("found %d capabilities\n", numcaps); | |
1985 | ||
2caf9a97 SH |
1986 | if (numcaps <= 0 || numcaps > 200) |
1987 | return -1; | |
1988 | ||
1fb86a7c SH |
1989 | // caplist[i] is 1 if we keep capability i |
1990 | int *caplist = alloca(numcaps * sizeof(int)); | |
1991 | memset(caplist, 0, numcaps * sizeof(int)); | |
1992 | ||
1993 | lxc_list_for_each(iterator, caps) { | |
1994 | ||
1995 | keep_entry = iterator->elem; | |
1996 | ||
1997 | capid = -1; | |
1998 | ||
1999 | for (i = 0; i < sizeof(caps_opt)/sizeof(caps_opt[0]); i++) { | |
2000 | ||
2001 | if (strcmp(keep_entry, caps_opt[i].name)) | |
2002 | continue; | |
2003 | ||
2004 | capid = caps_opt[i].value; | |
2005 | break; | |
2006 | } | |
2007 | ||
2008 | if (capid < 0) { | |
2009 | /* try to see if it's numeric, so the user may specify | |
2010 | * capabilities that the running kernel knows about but | |
2011 | * we don't */ | |
2012 | capid = strtol(keep_entry, &ptr, 10); | |
2013 | if (!ptr || *ptr != '\0' || | |
f371aca9 | 2014 | capid == INT_MIN || capid == INT_MAX) |
1fb86a7c SH |
2015 | /* not a valid number */ |
2016 | capid = -1; | |
2017 | else if (capid > lxc_caps_last_cap()) | |
2018 | /* we have a number but it's not a valid | |
2019 | * capability */ | |
2020 | capid = -1; | |
2021 | } | |
2022 | ||
2023 | if (capid < 0) { | |
2024 | ERROR("unknown capability %s", keep_entry); | |
2025 | return -1; | |
2026 | } | |
2027 | ||
2028 | DEBUG("drop capability '%s' (%d)", keep_entry, capid); | |
2029 | ||
2030 | caplist[capid] = 1; | |
2031 | } | |
2032 | for (i=0; i<numcaps; i++) { | |
2033 | if (caplist[i]) | |
2034 | continue; | |
2035 | if (prctl(PR_CAPBSET_DROP, i, 0, 0, 0)) { | |
2036 | SYSERROR("failed to remove capability %d", i); | |
2037 | return -1; | |
2038 | } | |
2039 | } | |
2040 | ||
2041 | DEBUG("capabilities have been setup"); | |
81810dd1 DL |
2042 | |
2043 | return 0; | |
2044 | } | |
2045 | ||
0ad19a3f | 2046 | static int setup_hw_addr(char *hwaddr, const char *ifname) |
2047 | { | |
2048 | struct sockaddr sockaddr; | |
2049 | struct ifreq ifr; | |
2050 | int ret, fd; | |
2051 | ||
3cfc0f3a MN |
2052 | ret = lxc_convert_mac(hwaddr, &sockaddr); |
2053 | if (ret) { | |
2054 | ERROR("mac address '%s' conversion failed : %s", | |
2055 | hwaddr, strerror(-ret)); | |
0ad19a3f | 2056 | return -1; |
2057 | } | |
2058 | ||
2059 | memcpy(ifr.ifr_name, ifname, IFNAMSIZ); | |
5da6aa8c | 2060 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
0ad19a3f | 2061 | memcpy((char *) &ifr.ifr_hwaddr, (char *) &sockaddr, sizeof(sockaddr)); |
2062 | ||
025ed0f3 | 2063 | process_lock(); |
0ad19a3f | 2064 | fd = socket(AF_INET, SOCK_DGRAM, 0); |
025ed0f3 | 2065 | process_unlock(); |
0ad19a3f | 2066 | if (fd < 0) { |
3ab87b66 | 2067 | ERROR("socket failure : %s", strerror(errno)); |
0ad19a3f | 2068 | return -1; |
2069 | } | |
2070 | ||
2071 | ret = ioctl(fd, SIOCSIFHWADDR, &ifr); | |
025ed0f3 | 2072 | process_lock(); |
0ad19a3f | 2073 | close(fd); |
025ed0f3 | 2074 | process_unlock(); |
0ad19a3f | 2075 | if (ret) |
3ab87b66 | 2076 | ERROR("ioctl failure : %s", strerror(errno)); |
0ad19a3f | 2077 | |
5da6aa8c | 2078 | DEBUG("mac address '%s' on '%s' has been setup", hwaddr, ifr.ifr_name); |
cd54d859 | 2079 | |
0ad19a3f | 2080 | return ret; |
2081 | } | |
2082 | ||
82d5ae15 | 2083 | static int setup_ipv4_addr(struct lxc_list *ip, int ifindex) |
0ad19a3f | 2084 | { |
82d5ae15 DL |
2085 | struct lxc_list *iterator; |
2086 | struct lxc_inetdev *inetdev; | |
3cfc0f3a | 2087 | int err; |
0ad19a3f | 2088 | |
82d5ae15 DL |
2089 | lxc_list_for_each(iterator, ip) { |
2090 | ||
2091 | inetdev = iterator->elem; | |
2092 | ||
0093bb8c DL |
2093 | err = lxc_ipv4_addr_add(ifindex, &inetdev->addr, |
2094 | &inetdev->bcast, inetdev->prefix); | |
3cfc0f3a MN |
2095 | if (err) { |
2096 | ERROR("failed to setup_ipv4_addr ifindex %d : %s", | |
2097 | ifindex, strerror(-err)); | |
82d5ae15 DL |
2098 | return -1; |
2099 | } | |
2100 | } | |
2101 | ||
2102 | return 0; | |
0ad19a3f | 2103 | } |
2104 | ||
82d5ae15 | 2105 | static int setup_ipv6_addr(struct lxc_list *ip, int ifindex) |
0ad19a3f | 2106 | { |
82d5ae15 | 2107 | struct lxc_list *iterator; |
7fa9074f | 2108 | struct lxc_inet6dev *inet6dev; |
3cfc0f3a | 2109 | int err; |
0ad19a3f | 2110 | |
82d5ae15 DL |
2111 | lxc_list_for_each(iterator, ip) { |
2112 | ||
2113 | inet6dev = iterator->elem; | |
2114 | ||
b3df193c | 2115 | err = lxc_ipv6_addr_add(ifindex, &inet6dev->addr, |
0093bb8c DL |
2116 | &inet6dev->mcast, &inet6dev->acast, |
2117 | inet6dev->prefix); | |
3cfc0f3a MN |
2118 | if (err) { |
2119 | ERROR("failed to setup_ipv6_addr ifindex %d : %s", | |
2120 | ifindex, strerror(-err)); | |
82d5ae15 | 2121 | return -1; |
3cfc0f3a | 2122 | } |
82d5ae15 DL |
2123 | } |
2124 | ||
2125 | return 0; | |
0ad19a3f | 2126 | } |
2127 | ||
82d5ae15 | 2128 | static int setup_netdev(struct lxc_netdev *netdev) |
0ad19a3f | 2129 | { |
0ad19a3f | 2130 | char ifname[IFNAMSIZ]; |
0ad19a3f | 2131 | char *current_ifname = ifname; |
3cfc0f3a | 2132 | int err; |
0ad19a3f | 2133 | |
82d5ae15 DL |
2134 | /* empty network namespace */ |
2135 | if (!netdev->ifindex) { | |
b0efbac4 | 2136 | if (netdev->flags & IFF_UP) { |
d472214b | 2137 | err = lxc_netdev_up("lo"); |
3cfc0f3a MN |
2138 | if (err) { |
2139 | ERROR("failed to set the loopback up : %s", | |
2140 | strerror(-err)); | |
82d5ae15 DL |
2141 | return -1; |
2142 | } | |
82d5ae15 | 2143 | } |
7b57e8b6 | 2144 | return 0; |
0ad19a3f | 2145 | } |
13954cce | 2146 | |
82d5ae15 DL |
2147 | /* retrieve the name of the interface */ |
2148 | if (!if_indextoname(netdev->ifindex, current_ifname)) { | |
36eb9bde | 2149 | ERROR("no interface corresponding to index '%d'", |
82d5ae15 | 2150 | netdev->ifindex); |
0ad19a3f | 2151 | return -1; |
2152 | } | |
13954cce | 2153 | |
018ef520 | 2154 | /* default: let the system to choose one interface name */ |
9d083402 | 2155 | if (!netdev->name) |
fb6d9b2f DL |
2156 | netdev->name = netdev->type == LXC_NET_PHYS ? |
2157 | netdev->link : "eth%d"; | |
018ef520 | 2158 | |
82d5ae15 | 2159 | /* rename the interface name */ |
b84f58b9 | 2160 | err = lxc_netdev_rename_by_name(ifname, netdev->name); |
3cfc0f3a MN |
2161 | if (err) { |
2162 | ERROR("failed to rename %s->%s : %s", ifname, netdev->name, | |
2163 | strerror(-err)); | |
018ef520 DL |
2164 | return -1; |
2165 | } | |
2166 | ||
2167 | /* Re-read the name of the interface because its name has changed | |
2168 | * and would be automatically allocated by the system | |
2169 | */ | |
82d5ae15 | 2170 | if (!if_indextoname(netdev->ifindex, current_ifname)) { |
018ef520 | 2171 | ERROR("no interface corresponding to index '%d'", |
82d5ae15 | 2172 | netdev->ifindex); |
018ef520 | 2173 | return -1; |
0ad19a3f | 2174 | } |
2175 | ||
82d5ae15 DL |
2176 | /* set a mac address */ |
2177 | if (netdev->hwaddr) { | |
2178 | if (setup_hw_addr(netdev->hwaddr, current_ifname)) { | |
36eb9bde | 2179 | ERROR("failed to setup hw address for '%s'", |
82d5ae15 | 2180 | current_ifname); |
0ad19a3f | 2181 | return -1; |
2182 | } | |
2183 | } | |
2184 | ||
82d5ae15 DL |
2185 | /* setup ipv4 addresses on the interface */ |
2186 | if (setup_ipv4_addr(&netdev->ipv4, netdev->ifindex)) { | |
36eb9bde | 2187 | ERROR("failed to setup ip addresses for '%s'", |
0ad19a3f | 2188 | ifname); |
2189 | return -1; | |
2190 | } | |
2191 | ||
82d5ae15 DL |
2192 | /* setup ipv6 addresses on the interface */ |
2193 | if (setup_ipv6_addr(&netdev->ipv6, netdev->ifindex)) { | |
36eb9bde | 2194 | ERROR("failed to setup ipv6 addresses for '%s'", |
0ad19a3f | 2195 | ifname); |
2196 | return -1; | |
2197 | } | |
2198 | ||
82d5ae15 | 2199 | /* set the network device up */ |
b0efbac4 | 2200 | if (netdev->flags & IFF_UP) { |
3cfc0f3a MN |
2201 | int err; |
2202 | ||
d472214b | 2203 | err = lxc_netdev_up(current_ifname); |
3cfc0f3a MN |
2204 | if (err) { |
2205 | ERROR("failed to set '%s' up : %s", current_ifname, | |
2206 | strerror(-err)); | |
0ad19a3f | 2207 | return -1; |
2208 | } | |
2209 | ||
2210 | /* the network is up, make the loopback up too */ | |
d472214b | 2211 | err = lxc_netdev_up("lo"); |
3cfc0f3a MN |
2212 | if (err) { |
2213 | ERROR("failed to set the loopback up : %s", | |
2214 | strerror(-err)); | |
0ad19a3f | 2215 | return -1; |
2216 | } | |
2217 | } | |
2218 | ||
f8fee0e2 MK |
2219 | /* We can only set up the default routes after bringing |
2220 | * up the interface, sine bringing up the interface adds | |
2221 | * the link-local routes and we can't add a default | |
2222 | * route if the gateway is not reachable. */ | |
2223 | ||
2224 | /* setup ipv4 gateway on the interface */ | |
2225 | if (netdev->ipv4_gateway) { | |
2226 | if (!(netdev->flags & IFF_UP)) { | |
2227 | ERROR("Cannot add ipv4 gateway for %s when not bringing up the interface", ifname); | |
2228 | return -1; | |
2229 | } | |
2230 | ||
2231 | if (lxc_list_empty(&netdev->ipv4)) { | |
2232 | ERROR("Cannot add ipv4 gateway for %s when not assigning an address", ifname); | |
2233 | return -1; | |
2234 | } | |
2235 | ||
2236 | err = lxc_ipv4_gateway_add(netdev->ifindex, netdev->ipv4_gateway); | |
2237 | if (err) { | |
2238 | ERROR("failed to setup ipv4 gateway for '%s': %s", | |
2239 | ifname, strerror(-err)); | |
19a26f82 MK |
2240 | if (netdev->ipv4_gateway_auto) { |
2241 | char buf[INET_ADDRSTRLEN]; | |
2242 | inet_ntop(AF_INET, netdev->ipv4_gateway, buf, sizeof(buf)); | |
2243 | ERROR("tried to set autodetected ipv4 gateway '%s'", buf); | |
2244 | } | |
f8fee0e2 MK |
2245 | return -1; |
2246 | } | |
2247 | } | |
2248 | ||
2249 | /* setup ipv6 gateway on the interface */ | |
2250 | if (netdev->ipv6_gateway) { | |
2251 | if (!(netdev->flags & IFF_UP)) { | |
2252 | ERROR("Cannot add ipv6 gateway for %s when not bringing up the interface", ifname); | |
2253 | return -1; | |
2254 | } | |
2255 | ||
2256 | if (lxc_list_empty(&netdev->ipv6) && !IN6_IS_ADDR_LINKLOCAL(netdev->ipv6_gateway)) { | |
2257 | ERROR("Cannot add ipv6 gateway for %s when not assigning an address", ifname); | |
2258 | return -1; | |
2259 | } | |
2260 | ||
2261 | err = lxc_ipv6_gateway_add(netdev->ifindex, netdev->ipv6_gateway); | |
2262 | if (err) { | |
2263 | ERROR("failed to setup ipv6 gateway for '%s': %s", | |
2264 | ifname, strerror(-err)); | |
19a26f82 MK |
2265 | if (netdev->ipv6_gateway_auto) { |
2266 | char buf[INET6_ADDRSTRLEN]; | |
72d0e1cb | 2267 | inet_ntop(AF_INET6, netdev->ipv6_gateway, buf, sizeof(buf)); |
19a26f82 MK |
2268 | ERROR("tried to set autodetected ipv6 gateway '%s'", buf); |
2269 | } | |
f8fee0e2 MK |
2270 | return -1; |
2271 | } | |
2272 | } | |
2273 | ||
cd54d859 DL |
2274 | DEBUG("'%s' has been setup", current_ifname); |
2275 | ||
0ad19a3f | 2276 | return 0; |
2277 | } | |
2278 | ||
5f4535a3 | 2279 | static int setup_network(struct lxc_list *network) |
0ad19a3f | 2280 | { |
82d5ae15 | 2281 | struct lxc_list *iterator; |
82d5ae15 | 2282 | struct lxc_netdev *netdev; |
0ad19a3f | 2283 | |
5f4535a3 | 2284 | lxc_list_for_each(iterator, network) { |
cd54d859 | 2285 | |
5f4535a3 | 2286 | netdev = iterator->elem; |
82d5ae15 DL |
2287 | |
2288 | if (setup_netdev(netdev)) { | |
2289 | ERROR("failed to setup netdev"); | |
2290 | return -1; | |
2291 | } | |
2292 | } | |
cd54d859 | 2293 | |
5f4535a3 DL |
2294 | if (!lxc_list_empty(network)) |
2295 | INFO("network has been setup"); | |
cd54d859 DL |
2296 | |
2297 | return 0; | |
0ad19a3f | 2298 | } |
2299 | ||
7b35f3d6 SH |
2300 | void lxc_rename_phys_nics_on_shutdown(struct lxc_conf *conf) |
2301 | { | |
2302 | int i; | |
2303 | ||
2304 | INFO("running to reset %d nic names", conf->num_savednics); | |
2305 | for (i=0; i<conf->num_savednics; i++) { | |
2306 | struct saved_nic *s = &conf->saved_nics[i]; | |
2307 | INFO("resetting nic %d to %s\n", s->ifindex, s->orig_name); | |
2308 | lxc_netdev_rename_by_index(s->ifindex, s->orig_name); | |
2309 | free(s->orig_name); | |
2310 | } | |
2311 | conf->num_savednics = 0; | |
2312 | free(conf->saved_nics); | |
2313 | } | |
2314 | ||
49684c0b CS |
2315 | static int setup_private_host_hw_addr(char *veth1) |
2316 | { | |
2317 | struct ifreq ifr; | |
2318 | int err; | |
2319 | int sockfd; | |
2320 | ||
025ed0f3 | 2321 | process_lock(); |
49684c0b | 2322 | sockfd = socket(AF_INET, SOCK_DGRAM, 0); |
025ed0f3 | 2323 | process_unlock(); |
49684c0b CS |
2324 | if (sockfd < 0) |
2325 | return -errno; | |
2326 | ||
2327 | snprintf((char *)ifr.ifr_name, IFNAMSIZ, "%s", veth1); | |
2328 | err = ioctl(sockfd, SIOCGIFHWADDR, &ifr); | |
2329 | if (err < 0) { | |
025ed0f3 | 2330 | process_lock(); |
49684c0b | 2331 | close(sockfd); |
025ed0f3 | 2332 | process_unlock(); |
49684c0b CS |
2333 | return -errno; |
2334 | } | |
2335 | ||
2336 | ifr.ifr_hwaddr.sa_data[0] = 0xfe; | |
2337 | err = ioctl(sockfd, SIOCSIFHWADDR, &ifr); | |
025ed0f3 | 2338 | process_lock(); |
49684c0b | 2339 | close(sockfd); |
025ed0f3 | 2340 | process_unlock(); |
49684c0b CS |
2341 | if (err < 0) |
2342 | return -errno; | |
2343 | ||
7ad84da7 DL |
2344 | DEBUG("mac address of host interface '%s' changed to private " |
2345 | "%02x:%02x:%02x:%02x:%02x:%02x", veth1, | |
2346 | ifr.ifr_hwaddr.sa_data[0] & 0xff, | |
2347 | ifr.ifr_hwaddr.sa_data[1] & 0xff, | |
2348 | ifr.ifr_hwaddr.sa_data[2] & 0xff, | |
2349 | ifr.ifr_hwaddr.sa_data[3] & 0xff, | |
2350 | ifr.ifr_hwaddr.sa_data[4] & 0xff, | |
2351 | ifr.ifr_hwaddr.sa_data[5] & 0xff); | |
49684c0b CS |
2352 | |
2353 | return 0; | |
2354 | } | |
2355 | ||
ae9242c8 SH |
2356 | static char *default_rootfs_mount = LXCROOTFSMOUNT; |
2357 | ||
7b379ab3 | 2358 | struct lxc_conf *lxc_conf_init(void) |
089cd8b8 | 2359 | { |
7b379ab3 | 2360 | struct lxc_conf *new; |
26ddeedd | 2361 | int i; |
7b379ab3 MN |
2362 | |
2363 | new = malloc(sizeof(*new)); | |
2364 | if (!new) { | |
2365 | ERROR("lxc_conf_init : %m"); | |
2366 | return NULL; | |
2367 | } | |
2368 | memset(new, 0, sizeof(*new)); | |
2369 | ||
b40a606e | 2370 | new->loglevel = LXC_LOG_PRIORITY_NOTSET; |
cccc74b5 | 2371 | new->personality = -1; |
596a818d DE |
2372 | new->console.log_path = NULL; |
2373 | new->console.log_fd = -1; | |
28a4b0e5 | 2374 | new->console.path = NULL; |
63376d7d | 2375 | new->console.peer = -1; |
b5159817 DE |
2376 | new->console.peerpty.busy = -1; |
2377 | new->console.peerpty.master = -1; | |
2378 | new->console.peerpty.slave = -1; | |
63376d7d DL |
2379 | new->console.master = -1; |
2380 | new->console.slave = -1; | |
2381 | new->console.name[0] = '\0'; | |
d2e30e99 | 2382 | new->maincmd_fd = -1; |
54c30e29 | 2383 | new->rootfs.mount = strdup(default_rootfs_mount); |
53f3f048 SH |
2384 | if (!new->rootfs.mount) { |
2385 | ERROR("lxc_conf_init : %m"); | |
2386 | free(new); | |
2387 | return NULL; | |
2388 | } | |
2f3f41d0 | 2389 | new->kmsg = 1; |
7b379ab3 MN |
2390 | lxc_list_init(&new->cgroup); |
2391 | lxc_list_init(&new->network); | |
2392 | lxc_list_init(&new->mount_list); | |
81810dd1 | 2393 | lxc_list_init(&new->caps); |
1fb86a7c | 2394 | lxc_list_init(&new->keepcaps); |
f6d3e3e4 | 2395 | lxc_list_init(&new->id_map); |
26ddeedd SH |
2396 | for (i=0; i<NUM_LXC_HOOKS; i++) |
2397 | lxc_list_init(&new->hooks[i]); | |
fe4de9a6 DE |
2398 | new->lsm_aa_profile = NULL; |
2399 | new->lsm_se_context = NULL; | |
e075f5d9 | 2400 | new->lsm_umount_proc = 0; |
7b379ab3 MN |
2401 | |
2402 | return new; | |
089cd8b8 DL |
2403 | } |
2404 | ||
e3b4c4c4 | 2405 | static int instanciate_veth(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2406 | { |
8634bc19 | 2407 | char veth1buf[IFNAMSIZ], *veth1; |
0e391e57 | 2408 | char veth2buf[IFNAMSIZ], *veth2; |
3cfc0f3a | 2409 | int err; |
13954cce | 2410 | |
e892973e DL |
2411 | if (netdev->priv.veth_attr.pair) |
2412 | veth1 = netdev->priv.veth_attr.pair; | |
8634bc19 | 2413 | else { |
9ba8130c SH |
2414 | err = snprintf(veth1buf, sizeof(veth1buf), "vethXXXXXX"); |
2415 | if (err >= sizeof(veth1buf)) { /* can't *really* happen, but... */ | |
2416 | ERROR("veth1 name too long"); | |
2417 | return -1; | |
2418 | } | |
4a0ba80d | 2419 | veth1 = mkifname(veth1buf); |
74a2b586 JK |
2420 | /* store away for deconf */ |
2421 | memcpy(netdev->priv.veth_attr.veth1, veth1, IFNAMSIZ); | |
8634bc19 | 2422 | } |
82d5ae15 | 2423 | |
0e391e57 | 2424 | snprintf(veth2buf, sizeof(veth2buf), "vethXXXXXX"); |
4a0ba80d | 2425 | veth2 = mkifname(veth2buf); |
82d5ae15 DL |
2426 | |
2427 | if (!strlen(veth1) || !strlen(veth2)) { | |
2428 | ERROR("failed to allocate a temporary name"); | |
2429 | return -1; | |
0ad19a3f | 2430 | } |
2431 | ||
3cfc0f3a MN |
2432 | err = lxc_veth_create(veth1, veth2); |
2433 | if (err) { | |
2434 | ERROR("failed to create %s-%s : %s", veth1, veth2, | |
2435 | strerror(-err)); | |
6ab9ab6d | 2436 | return -1; |
0ad19a3f | 2437 | } |
13954cce | 2438 | |
49684c0b CS |
2439 | /* changing the high byte of the mac address to 0xfe, the bridge interface |
2440 | * will always keep the host's mac address and not take the mac address | |
2441 | * of a container */ | |
2442 | err = setup_private_host_hw_addr(veth1); | |
2443 | if (err) { | |
2444 | ERROR("failed to change mac address of host interface '%s' : %s", | |
2445 | veth1, strerror(-err)); | |
2446 | goto out_delete; | |
2447 | } | |
2448 | ||
82d5ae15 | 2449 | if (netdev->mtu) { |
d472214b | 2450 | err = lxc_netdev_set_mtu(veth1, atoi(netdev->mtu)); |
3cfc0f3a | 2451 | if (!err) |
d472214b | 2452 | err = lxc_netdev_set_mtu(veth2, atoi(netdev->mtu)); |
3cfc0f3a MN |
2453 | if (err) { |
2454 | ERROR("failed to set mtu '%s' for %s-%s : %s", | |
2455 | netdev->mtu, veth1, veth2, strerror(-err)); | |
eb14c10a | 2456 | goto out_delete; |
75d09f83 DL |
2457 | } |
2458 | } | |
2459 | ||
3cfc0f3a MN |
2460 | if (netdev->link) { |
2461 | err = lxc_bridge_attach(netdev->link, veth1); | |
2462 | if (err) { | |
2463 | ERROR("failed to attach '%s' to the bridge '%s' : %s", | |
2464 | veth1, netdev->link, strerror(-err)); | |
2465 | goto out_delete; | |
2466 | } | |
eb14c10a DL |
2467 | } |
2468 | ||
82d5ae15 DL |
2469 | netdev->ifindex = if_nametoindex(veth2); |
2470 | if (!netdev->ifindex) { | |
36eb9bde | 2471 | ERROR("failed to retrieve the index for %s", veth2); |
eb14c10a DL |
2472 | goto out_delete; |
2473 | } | |
2474 | ||
d472214b | 2475 | err = lxc_netdev_up(veth1); |
6e35af2e DL |
2476 | if (err) { |
2477 | ERROR("failed to set %s up : %s", veth1, strerror(-err)); | |
2478 | goto out_delete; | |
0ad19a3f | 2479 | } |
2480 | ||
e3b4c4c4 | 2481 | if (netdev->upscript) { |
751d9dcd DL |
2482 | err = run_script(handler->name, "net", netdev->upscript, "up", |
2483 | "veth", veth1, (char*) NULL); | |
2484 | if (err) | |
e3b4c4c4 | 2485 | goto out_delete; |
e3b4c4c4 ST |
2486 | } |
2487 | ||
82d5ae15 DL |
2488 | DEBUG("instanciated veth '%s/%s', index is '%d'", |
2489 | veth1, veth2, netdev->ifindex); | |
2490 | ||
6ab9ab6d | 2491 | return 0; |
eb14c10a DL |
2492 | |
2493 | out_delete: | |
b84f58b9 | 2494 | lxc_netdev_delete_by_name(veth1); |
6ab9ab6d | 2495 | return -1; |
13954cce | 2496 | } |
d957ae2d | 2497 | |
74a2b586 JK |
2498 | static int shutdown_veth(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2499 | { | |
2500 | char *veth1; | |
2501 | int err; | |
2502 | ||
2503 | if (netdev->priv.veth_attr.pair) | |
2504 | veth1 = netdev->priv.veth_attr.pair; | |
2505 | else | |
2506 | veth1 = netdev->priv.veth_attr.veth1; | |
2507 | ||
2508 | if (netdev->downscript) { | |
2509 | err = run_script(handler->name, "net", netdev->downscript, | |
2510 | "down", "veth", veth1, (char*) NULL); | |
2511 | if (err) | |
2512 | return -1; | |
2513 | } | |
2514 | return 0; | |
2515 | } | |
2516 | ||
e3b4c4c4 | 2517 | static int instanciate_macvlan(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2518 | { |
0e391e57 | 2519 | char peerbuf[IFNAMSIZ], *peer; |
3cfc0f3a | 2520 | int err; |
d957ae2d MT |
2521 | |
2522 | if (!netdev->link) { | |
2523 | ERROR("no link specified for macvlan netdev"); | |
2524 | return -1; | |
2525 | } | |
13954cce | 2526 | |
9ba8130c SH |
2527 | err = snprintf(peerbuf, sizeof(peerbuf), "mcXXXXXX"); |
2528 | if (err >= sizeof(peerbuf)) | |
2529 | return -1; | |
82d5ae15 | 2530 | |
4a0ba80d | 2531 | peer = mkifname(peerbuf); |
82d5ae15 DL |
2532 | if (!strlen(peer)) { |
2533 | ERROR("failed to make a temporary name"); | |
2534 | return -1; | |
0ad19a3f | 2535 | } |
2536 | ||
3cfc0f3a MN |
2537 | err = lxc_macvlan_create(netdev->link, peer, |
2538 | netdev->priv.macvlan_attr.mode); | |
2539 | if (err) { | |
2540 | ERROR("failed to create macvlan interface '%s' on '%s' : %s", | |
2541 | peer, netdev->link, strerror(-err)); | |
d957ae2d | 2542 | return -1; |
0ad19a3f | 2543 | } |
2544 | ||
82d5ae15 DL |
2545 | netdev->ifindex = if_nametoindex(peer); |
2546 | if (!netdev->ifindex) { | |
36eb9bde | 2547 | ERROR("failed to retrieve the index for %s", peer); |
b84f58b9 | 2548 | lxc_netdev_delete_by_name(peer); |
d957ae2d | 2549 | return -1; |
22ebac19 | 2550 | } |
2551 | ||
e3b4c4c4 | 2552 | if (netdev->upscript) { |
751d9dcd DL |
2553 | err = run_script(handler->name, "net", netdev->upscript, "up", |
2554 | "macvlan", netdev->link, (char*) NULL); | |
2555 | if (err) | |
e3b4c4c4 | 2556 | return -1; |
e3b4c4c4 ST |
2557 | } |
2558 | ||
e892973e DL |
2559 | DEBUG("instanciated macvlan '%s', index is '%d' and mode '%d'", |
2560 | peer, netdev->ifindex, netdev->priv.macvlan_attr.mode); | |
0ad19a3f | 2561 | |
d957ae2d | 2562 | return 0; |
0ad19a3f | 2563 | } |
2564 | ||
74a2b586 JK |
2565 | static int shutdown_macvlan(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2566 | { | |
2567 | int err; | |
2568 | ||
2569 | if (netdev->downscript) { | |
2570 | err = run_script(handler->name, "net", netdev->downscript, | |
2571 | "down", "macvlan", netdev->link, | |
2572 | (char*) NULL); | |
2573 | if (err) | |
2574 | return -1; | |
2575 | } | |
2576 | return 0; | |
2577 | } | |
2578 | ||
26c39028 | 2579 | /* XXX: merge with instanciate_macvlan */ |
e3b4c4c4 | 2580 | static int instanciate_vlan(struct lxc_handler *handler, struct lxc_netdev *netdev) |
26c39028 JHS |
2581 | { |
2582 | char peer[IFNAMSIZ]; | |
3cfc0f3a | 2583 | int err; |
26c39028 JHS |
2584 | |
2585 | if (!netdev->link) { | |
2586 | ERROR("no link specified for vlan netdev"); | |
2587 | return -1; | |
2588 | } | |
2589 | ||
9ba8130c SH |
2590 | err = snprintf(peer, sizeof(peer), "vlan%d", netdev->priv.vlan_attr.vid); |
2591 | if (err >= sizeof(peer)) { | |
2592 | ERROR("peer name too long"); | |
2593 | return -1; | |
2594 | } | |
26c39028 | 2595 | |
3cfc0f3a MN |
2596 | err = lxc_vlan_create(netdev->link, peer, netdev->priv.vlan_attr.vid); |
2597 | if (err) { | |
2598 | ERROR("failed to create vlan interface '%s' on '%s' : %s", | |
2599 | peer, netdev->link, strerror(-err)); | |
26c39028 JHS |
2600 | return -1; |
2601 | } | |
2602 | ||
2603 | netdev->ifindex = if_nametoindex(peer); | |
2604 | if (!netdev->ifindex) { | |
2605 | ERROR("failed to retrieve the ifindex for %s", peer); | |
b84f58b9 | 2606 | lxc_netdev_delete_by_name(peer); |
26c39028 JHS |
2607 | return -1; |
2608 | } | |
2609 | ||
e892973e DL |
2610 | DEBUG("instanciated vlan '%s', ifindex is '%d'", " vlan1000", |
2611 | netdev->ifindex); | |
2612 | ||
26c39028 JHS |
2613 | return 0; |
2614 | } | |
2615 | ||
74a2b586 JK |
2616 | static int shutdown_vlan(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2617 | { | |
2618 | return 0; | |
2619 | } | |
2620 | ||
e3b4c4c4 | 2621 | static int instanciate_phys(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2622 | { |
6168e99f DL |
2623 | if (!netdev->link) { |
2624 | ERROR("no link specified for the physical interface"); | |
2625 | return -1; | |
2626 | } | |
2627 | ||
9d083402 | 2628 | netdev->ifindex = if_nametoindex(netdev->link); |
82d5ae15 | 2629 | if (!netdev->ifindex) { |
9d083402 | 2630 | ERROR("failed to retrieve the index for %s", netdev->link); |
0ad19a3f | 2631 | return -1; |
2632 | } | |
2633 | ||
e3b4c4c4 ST |
2634 | if (netdev->upscript) { |
2635 | int err; | |
751d9dcd DL |
2636 | err = run_script(handler->name, "net", netdev->upscript, |
2637 | "up", "phys", netdev->link, (char*) NULL); | |
2638 | if (err) | |
e3b4c4c4 | 2639 | return -1; |
e3b4c4c4 ST |
2640 | } |
2641 | ||
82d5ae15 | 2642 | return 0; |
0ad19a3f | 2643 | } |
2644 | ||
74a2b586 JK |
2645 | static int shutdown_phys(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2646 | { | |
2647 | int err; | |
2648 | ||
2649 | if (netdev->downscript) { | |
2650 | err = run_script(handler->name, "net", netdev->downscript, | |
2651 | "down", "phys", netdev->link, (char*) NULL); | |
2652 | if (err) | |
2653 | return -1; | |
2654 | } | |
2655 | return 0; | |
2656 | } | |
2657 | ||
e3b4c4c4 | 2658 | static int instanciate_empty(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2659 | { |
82d5ae15 | 2660 | netdev->ifindex = 0; |
e3b4c4c4 ST |
2661 | if (netdev->upscript) { |
2662 | int err; | |
751d9dcd DL |
2663 | err = run_script(handler->name, "net", netdev->upscript, |
2664 | "up", "empty", (char*) NULL); | |
2665 | if (err) | |
e3b4c4c4 | 2666 | return -1; |
e3b4c4c4 | 2667 | } |
82d5ae15 | 2668 | return 0; |
0ad19a3f | 2669 | } |
2670 | ||
74a2b586 JK |
2671 | static int shutdown_empty(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2672 | { | |
2673 | int err; | |
2674 | ||
2675 | if (netdev->downscript) { | |
2676 | err = run_script(handler->name, "net", netdev->downscript, | |
2677 | "down", "empty", (char*) NULL); | |
2678 | if (err) | |
2679 | return -1; | |
2680 | } | |
2681 | return 0; | |
2682 | } | |
2683 | ||
e3b4c4c4 | 2684 | int lxc_create_network(struct lxc_handler *handler) |
0ad19a3f | 2685 | { |
e3b4c4c4 | 2686 | struct lxc_list *network = &handler->conf->network; |
82d5ae15 | 2687 | struct lxc_list *iterator; |
82d5ae15 | 2688 | struct lxc_netdev *netdev; |
cbef6c52 SH |
2689 | int am_root = (getuid() == 0); |
2690 | ||
2691 | if (!am_root) | |
2692 | return 0; | |
0ad19a3f | 2693 | |
5f4535a3 | 2694 | lxc_list_for_each(iterator, network) { |
0ad19a3f | 2695 | |
5f4535a3 | 2696 | netdev = iterator->elem; |
13954cce | 2697 | |
24654103 | 2698 | if (netdev->type < 0 || netdev->type > LXC_NET_MAXCONFTYPE) { |
82d5ae15 | 2699 | ERROR("invalid network configuration type '%d'", |
5f4535a3 | 2700 | netdev->type); |
82d5ae15 DL |
2701 | return -1; |
2702 | } | |
0ad19a3f | 2703 | |
e3b4c4c4 | 2704 | if (netdev_conf[netdev->type](handler, netdev)) { |
82d5ae15 DL |
2705 | ERROR("failed to create netdev"); |
2706 | return -1; | |
2707 | } | |
e3b4c4c4 | 2708 | |
0ad19a3f | 2709 | } |
2710 | ||
2711 | return 0; | |
2712 | } | |
2713 | ||
74a2b586 | 2714 | void lxc_delete_network(struct lxc_handler *handler) |
7fef7a06 | 2715 | { |
74a2b586 | 2716 | struct lxc_list *network = &handler->conf->network; |
7fef7a06 DL |
2717 | struct lxc_list *iterator; |
2718 | struct lxc_netdev *netdev; | |
2719 | ||
2720 | lxc_list_for_each(iterator, network) { | |
2721 | netdev = iterator->elem; | |
d472214b | 2722 | |
74a2b586 | 2723 | if (netdev->ifindex != 0 && netdev->type == LXC_NET_PHYS) { |
d8f8e352 DL |
2724 | if (lxc_netdev_rename_by_index(netdev->ifindex, netdev->link)) |
2725 | WARN("failed to rename to the initial name the " \ | |
2726 | "netdev '%s'", netdev->link); | |
d472214b | 2727 | continue; |
d8f8e352 | 2728 | } |
d472214b | 2729 | |
74a2b586 JK |
2730 | if (netdev_deconf[netdev->type](handler, netdev)) { |
2731 | WARN("failed to destroy netdev"); | |
2732 | } | |
2733 | ||
d8f8e352 DL |
2734 | /* Recent kernel remove the virtual interfaces when the network |
2735 | * namespace is destroyed but in case we did not moved the | |
2736 | * interface to the network namespace, we have to destroy it | |
2737 | */ | |
74a2b586 JK |
2738 | if (netdev->ifindex != 0 && |
2739 | lxc_netdev_delete_by_index(netdev->ifindex)) | |
d8f8e352 | 2740 | WARN("failed to remove interface '%s'", netdev->name); |
7fef7a06 DL |
2741 | } |
2742 | } | |
2743 | ||
cbef6c52 SH |
2744 | int unpriv_assign_nic(struct lxc_netdev *netdev, pid_t pid) |
2745 | { | |
2746 | pid_t child; | |
2747 | ||
2748 | if (netdev->type != LXC_NET_VETH) { | |
2749 | ERROR("nic type %d not support for unprivileged use", | |
2750 | netdev->type); | |
2751 | return -1; | |
2752 | } | |
2753 | ||
2754 | if ((child = fork()) < 0) { | |
2755 | SYSERROR("fork"); | |
2756 | return -1; | |
2757 | } | |
2758 | ||
2759 | if (child > 0) | |
2760 | return wait_for_pid(child); | |
2761 | ||
2762 | // Call lxc-user-nic pid type bridge | |
2763 | char pidstr[20]; | |
4119204e | 2764 | char *args[] = { "lxc-user-nic", pidstr, "veth", netdev->link, netdev->name, NULL }; |
cbef6c52 SH |
2765 | snprintf(pidstr, 19, "%lu", (unsigned long) pid); |
2766 | pidstr[19] = '\0'; | |
2767 | execvp("lxc-user-nic", args); | |
2768 | SYSERROR("execvp lxc-user-nic"); | |
2769 | exit(1); | |
2770 | } | |
2771 | ||
5f4535a3 | 2772 | int lxc_assign_network(struct lxc_list *network, pid_t pid) |
0ad19a3f | 2773 | { |
82d5ae15 | 2774 | struct lxc_list *iterator; |
82d5ae15 | 2775 | struct lxc_netdev *netdev; |
cbef6c52 | 2776 | int am_root = (getuid() == 0); |
3cfc0f3a | 2777 | int err; |
0ad19a3f | 2778 | |
5f4535a3 | 2779 | lxc_list_for_each(iterator, network) { |
82d5ae15 | 2780 | |
5f4535a3 | 2781 | netdev = iterator->elem; |
82d5ae15 | 2782 | |
cbef6c52 SH |
2783 | if (!am_root) { |
2784 | if (unpriv_assign_nic(netdev, pid)) | |
2785 | return -1; | |
2786 | // TODO fill in netdev->ifindex and name | |
2787 | continue; | |
2788 | } | |
236087a6 DL |
2789 | /* empty network namespace, nothing to move */ |
2790 | if (!netdev->ifindex) | |
2791 | continue; | |
2792 | ||
d472214b | 2793 | err = lxc_netdev_move_by_index(netdev->ifindex, pid); |
3cfc0f3a MN |
2794 | if (err) { |
2795 | ERROR("failed to move '%s' to the container : %s", | |
2796 | netdev->link, strerror(-err)); | |
82d5ae15 DL |
2797 | return -1; |
2798 | } | |
2799 | ||
c1c75c04 | 2800 | DEBUG("move '%s' to '%d'", netdev->name, pid); |
0ad19a3f | 2801 | } |
2802 | ||
2803 | return 0; | |
2804 | } | |
2805 | ||
251d0d2a DE |
2806 | static int write_id_mapping(enum idtype idtype, pid_t pid, const char *buf, |
2807 | size_t buf_size) | |
f6d3e3e4 SH |
2808 | { |
2809 | char path[PATH_MAX]; | |
e4ccd113 | 2810 | int ret, closeret; |
f6d3e3e4 SH |
2811 | FILE *f; |
2812 | ||
2813 | ret = snprintf(path, PATH_MAX, "/proc/%d/%cid_map", pid, idtype == ID_TYPE_UID ? 'u' : 'g'); | |
2814 | if (ret < 0 || ret >= PATH_MAX) { | |
2815 | fprintf(stderr, "%s: path name too long", __func__); | |
2816 | return -E2BIG; | |
2817 | } | |
025ed0f3 | 2818 | process_lock(); |
f6d3e3e4 | 2819 | f = fopen(path, "w"); |
025ed0f3 | 2820 | process_unlock(); |
f6d3e3e4 SH |
2821 | if (!f) { |
2822 | perror("open"); | |
2823 | return -EINVAL; | |
2824 | } | |
251d0d2a | 2825 | ret = fwrite(buf, buf_size, 1, f); |
f6d3e3e4 | 2826 | if (ret < 0) |
e4ccd113 | 2827 | SYSERROR("writing id mapping"); |
025ed0f3 | 2828 | process_lock(); |
e4ccd113 | 2829 | closeret = fclose(f); |
025ed0f3 | 2830 | process_unlock(); |
e4ccd113 SH |
2831 | if (closeret) |
2832 | SYSERROR("writing id mapping"); | |
2833 | return ret < 0 ? ret : closeret; | |
f6d3e3e4 SH |
2834 | } |
2835 | ||
2836 | int lxc_map_ids(struct lxc_list *idmap, pid_t pid) | |
2837 | { | |
2838 | struct lxc_list *iterator; | |
2839 | struct id_map *map; | |
2840 | int ret = 0; | |
251d0d2a | 2841 | enum idtype type; |
4f7521b4 | 2842 | char *buf = NULL, *pos; |
cf3ef16d | 2843 | int am_root = (getuid() == 0); |
251d0d2a DE |
2844 | |
2845 | for(type = ID_TYPE_UID; type <= ID_TYPE_GID; type++) { | |
4f7521b4 | 2846 | int left, fill; |
cf3ef16d SH |
2847 | int had_entry = 0; |
2848 | if (!buf) { | |
2849 | buf = pos = malloc(4096); | |
4f7521b4 SH |
2850 | if (!buf) |
2851 | return -ENOMEM; | |
cf3ef16d SH |
2852 | } |
2853 | pos = buf; | |
2854 | if (!am_root) | |
2855 | pos += sprintf(buf, "new%cidmap %d ", | |
2856 | type == ID_TYPE_UID ? 'u' : 'g', | |
2857 | pid); | |
4f7521b4 | 2858 | |
cf3ef16d SH |
2859 | lxc_list_for_each(iterator, idmap) { |
2860 | /* The kernel only takes <= 4k for writes to /proc/<nr>/[ug]id_map */ | |
251d0d2a | 2861 | map = iterator->elem; |
cf3ef16d SH |
2862 | if (map->idtype != type) |
2863 | continue; | |
2864 | ||
2865 | had_entry = 1; | |
2866 | left = 4096 - (pos - buf); | |
2867 | fill = snprintf(pos, left, " %lu %lu %lu", map->nsid, | |
2868 | map->hostid, map->range); | |
2869 | if (fill <= 0 || fill >= left) | |
2870 | SYSERROR("snprintf failed, too many mappings"); | |
2871 | pos += fill; | |
251d0d2a | 2872 | } |
cf3ef16d | 2873 | if (!had_entry) |
4f7521b4 | 2874 | continue; |
cf3ef16d SH |
2875 | left = 4096 - (pos - buf); |
2876 | fill = snprintf(pos, left, "\n"); | |
2877 | if (fill <= 0 || fill >= left) | |
2878 | SYSERROR("snprintf failed, too many mappings"); | |
2879 | pos += fill; | |
2880 | ||
2881 | if (am_root) | |
2882 | ret = write_id_mapping(type, pid, buf, pos-buf); | |
2883 | else | |
2884 | ret = system(buf); | |
2885 | ||
f6d3e3e4 SH |
2886 | if (ret) |
2887 | break; | |
2888 | } | |
251d0d2a | 2889 | |
4f7521b4 SH |
2890 | if (buf) |
2891 | free(buf); | |
f6d3e3e4 SH |
2892 | return ret; |
2893 | } | |
2894 | ||
cf3ef16d SH |
2895 | /* |
2896 | * return the host uid to which the container root is mapped, or -1 on | |
2897 | * error | |
2898 | */ | |
c4d10a05 | 2899 | uid_t get_mapped_rootid(struct lxc_conf *conf) |
cf3ef16d SH |
2900 | { |
2901 | struct lxc_list *it; | |
2902 | struct id_map *map; | |
2903 | ||
2904 | lxc_list_for_each(it, &conf->id_map) { | |
2905 | map = it->elem; | |
2906 | if (map->idtype != ID_TYPE_UID) | |
2907 | continue; | |
2908 | if (map->nsid != 0) | |
2909 | continue; | |
c4d10a05 | 2910 | return (uid_t) map->hostid; |
cf3ef16d | 2911 | } |
c4d10a05 | 2912 | return (uid_t)-1; |
cf3ef16d SH |
2913 | } |
2914 | ||
57d116ab | 2915 | int mapped_hostid(int id, struct lxc_conf *conf) |
cf3ef16d SH |
2916 | { |
2917 | struct lxc_list *it; | |
2918 | struct id_map *map; | |
2919 | lxc_list_for_each(it, &conf->id_map) { | |
2920 | map = it->elem; | |
2921 | if (map->idtype != ID_TYPE_UID) | |
2922 | continue; | |
2923 | if (id >= map->hostid && id < map->hostid + map->range) | |
57d116ab | 2924 | return (id - map->hostid) + map->nsid; |
cf3ef16d | 2925 | } |
57d116ab | 2926 | return -1; |
cf3ef16d SH |
2927 | } |
2928 | ||
2929 | int find_unmapped_nsuid(struct lxc_conf *conf) | |
2930 | { | |
2931 | struct lxc_list *it; | |
2932 | struct id_map *map; | |
2933 | uid_t freeid = 0; | |
2934 | again: | |
2935 | lxc_list_for_each(it, &conf->id_map) { | |
2936 | map = it->elem; | |
2937 | if (map->idtype != ID_TYPE_UID) | |
2938 | continue; | |
2939 | if (freeid >= map->nsid && freeid < map->nsid + map->range) { | |
2940 | freeid = map->nsid + map->range; | |
2941 | goto again; | |
2942 | } | |
2943 | } | |
2944 | return freeid; | |
2945 | } | |
2946 | ||
19a26f82 MK |
2947 | int lxc_find_gateway_addresses(struct lxc_handler *handler) |
2948 | { | |
2949 | struct lxc_list *network = &handler->conf->network; | |
2950 | struct lxc_list *iterator; | |
2951 | struct lxc_netdev *netdev; | |
2952 | int link_index; | |
2953 | ||
2954 | lxc_list_for_each(iterator, network) { | |
2955 | netdev = iterator->elem; | |
2956 | ||
2957 | if (!netdev->ipv4_gateway_auto && !netdev->ipv6_gateway_auto) | |
2958 | continue; | |
2959 | ||
2960 | if (netdev->type != LXC_NET_VETH && netdev->type != LXC_NET_MACVLAN) { | |
2961 | ERROR("gateway = auto only supported for " | |
2962 | "veth and macvlan"); | |
2963 | return -1; | |
2964 | } | |
2965 | ||
2966 | if (!netdev->link) { | |
2967 | ERROR("gateway = auto needs a link interface"); | |
2968 | return -1; | |
2969 | } | |
2970 | ||
2971 | link_index = if_nametoindex(netdev->link); | |
2972 | if (!link_index) | |
2973 | return -EINVAL; | |
2974 | ||
2975 | if (netdev->ipv4_gateway_auto) { | |
2976 | if (lxc_ipv4_addr_get(link_index, &netdev->ipv4_gateway)) { | |
2977 | ERROR("failed to automatically find ipv4 gateway " | |
2978 | "address from link interface '%s'", netdev->link); | |
2979 | return -1; | |
2980 | } | |
2981 | } | |
2982 | ||
2983 | if (netdev->ipv6_gateway_auto) { | |
2984 | if (lxc_ipv6_addr_get(link_index, &netdev->ipv6_gateway)) { | |
2985 | ERROR("failed to automatically find ipv6 gateway " | |
2986 | "address from link interface '%s'", netdev->link); | |
2987 | return -1; | |
2988 | } | |
2989 | } | |
2990 | } | |
2991 | ||
2992 | return 0; | |
2993 | } | |
2994 | ||
5e4a62bf | 2995 | int lxc_create_tty(const char *name, struct lxc_conf *conf) |
b0a33c1e | 2996 | { |
5e4a62bf | 2997 | struct lxc_tty_info *tty_info = &conf->tty_info; |
025ed0f3 | 2998 | int i, ret; |
b0a33c1e | 2999 | |
5e4a62bf DL |
3000 | /* no tty in the configuration */ |
3001 | if (!conf->tty) | |
b0a33c1e | 3002 | return 0; |
3003 | ||
13954cce | 3004 | tty_info->pty_info = |
e4e7d59d | 3005 | malloc(sizeof(*tty_info->pty_info)*conf->tty); |
b0a33c1e | 3006 | if (!tty_info->pty_info) { |
36eb9bde | 3007 | SYSERROR("failed to allocate pty_info"); |
985d15b1 | 3008 | return -1; |
b0a33c1e | 3009 | } |
3010 | ||
985d15b1 | 3011 | for (i = 0; i < conf->tty; i++) { |
13954cce | 3012 | |
b0a33c1e | 3013 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; |
3014 | ||
025ed0f3 SH |
3015 | process_lock(); |
3016 | ret = openpty(&pty_info->master, &pty_info->slave, | |
3017 | pty_info->name, NULL, NULL); | |
3018 | process_unlock(); | |
3019 | if (ret) { | |
36eb9bde | 3020 | SYSERROR("failed to create pty #%d", i); |
985d15b1 MT |
3021 | tty_info->nbtty = i; |
3022 | lxc_delete_tty(tty_info); | |
3023 | return -1; | |
b0a33c1e | 3024 | } |
3025 | ||
5332bb84 DL |
3026 | DEBUG("allocated pty '%s' (%d/%d)", |
3027 | pty_info->name, pty_info->master, pty_info->slave); | |
3028 | ||
b035ad62 MS |
3029 | /* Prevent leaking the file descriptors to the container */ |
3030 | fcntl(pty_info->master, F_SETFD, FD_CLOEXEC); | |
3031 | fcntl(pty_info->slave, F_SETFD, FD_CLOEXEC); | |
3032 | ||
b0a33c1e | 3033 | pty_info->busy = 0; |
3034 | } | |
3035 | ||
985d15b1 | 3036 | tty_info->nbtty = conf->tty; |
1ac470c0 DL |
3037 | |
3038 | INFO("tty's configured"); | |
3039 | ||
985d15b1 | 3040 | return 0; |
b0a33c1e | 3041 | } |
3042 | ||
3043 | void lxc_delete_tty(struct lxc_tty_info *tty_info) | |
3044 | { | |
3045 | int i; | |
3046 | ||
3047 | for (i = 0; i < tty_info->nbtty; i++) { | |
3048 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; | |
3049 | ||
025ed0f3 | 3050 | process_lock(); |
b0a33c1e | 3051 | close(pty_info->master); |
3052 | close(pty_info->slave); | |
025ed0f3 | 3053 | process_unlock(); |
b0a33c1e | 3054 | } |
3055 | ||
3056 | free(tty_info->pty_info); | |
3057 | tty_info->nbtty = 0; | |
3058 | } | |
3059 | ||
f6d3e3e4 | 3060 | /* |
c4d10a05 SH |
3061 | * chown_mapped_root: for an unprivileged user with uid X to chown a dir |
3062 | * to subuid Y, he needs to run chown as root in a userns where | |
3063 | * nsid 0 is mapped to hostuid Y, and nsid Y is mapped to hostuid | |
3064 | * X. That way, the container root is privileged with respect to | |
3065 | * hostuid X, allowing him to do the chown. | |
f6d3e3e4 | 3066 | */ |
c4d10a05 | 3067 | int chown_mapped_root(char *path, struct lxc_conf *conf) |
f6d3e3e4 | 3068 | { |
c4d10a05 SH |
3069 | uid_t rootid; |
3070 | pid_t pid; | |
f6d3e3e4 | 3071 | |
c4d10a05 SH |
3072 | if ((rootid = get_mapped_rootid(conf)) <= 0) { |
3073 | ERROR("No mapping for container root"); | |
3074 | return -1; | |
f6d3e3e4 | 3075 | } |
c4d10a05 SH |
3076 | if (geteuid() == 0) { |
3077 | if (chown(path, rootid, -1) < 0) { | |
3078 | ERROR("Error chowning %s", path); | |
3079 | return -1; | |
3080 | } | |
3081 | return 0; | |
3082 | } | |
3083 | pid = fork(); | |
3084 | if (pid < 0) { | |
3085 | SYSERROR("Failed forking"); | |
f6d3e3e4 SH |
3086 | return -1; |
3087 | } | |
c4d10a05 SH |
3088 | if (!pid) { |
3089 | int hostuid = geteuid(), ret; | |
3090 | char map1[100], map2[100]; | |
3091 | char *args[] = {"lxc-usernsexec", "-m", map1, "-m", map2, "--", "chown", | |
3092 | "0", path, NULL}; | |
f6d3e3e4 | 3093 | |
c4d10a05 SH |
3094 | // "b:0:rootid:1" |
3095 | ret = snprintf(map1, 100, "b:0:%d:1", rootid); | |
3096 | if (ret < 0 || ret >= 100) { | |
3097 | ERROR("Error uid printing map string"); | |
f6d3e3e4 SH |
3098 | return -1; |
3099 | } | |
c4d10a05 SH |
3100 | |
3101 | // "b:hostuid:hostuid:1" | |
3102 | ret = snprintf(map2, 100, "b:%d:%d:1", hostuid, hostuid); | |
3103 | if (ret < 0 || ret >= 100) { | |
3104 | ERROR("Error uid printing map string"); | |
3105 | return -1; | |
3106 | } | |
3107 | ||
3108 | ret = execvp("lxc-usernsexec", args); | |
3109 | SYSERROR("Failed executing usernsexec"); | |
3110 | exit(1); | |
f6d3e3e4 | 3111 | } |
c4d10a05 | 3112 | return wait_for_pid(pid); |
f6d3e3e4 SH |
3113 | } |
3114 | ||
c4d10a05 | 3115 | int ttys_shift_ids(struct lxc_conf *c) |
f6d3e3e4 | 3116 | { |
c4d10a05 | 3117 | int i; |
f6d3e3e4 | 3118 | |
c4d10a05 | 3119 | if (lxc_list_empty(&c->id_map)) |
f6d3e3e4 | 3120 | return 0; |
c4d10a05 SH |
3121 | |
3122 | for (i = 0; i < c->tty_info.nbtty; i++) { | |
3123 | struct lxc_pty_info *pty_info = &c->tty_info.pty_info[i]; | |
3124 | ||
3125 | if (chown_mapped_root(pty_info->name, c) < 0) { | |
3126 | ERROR("Failed to chown %s", pty_info->name); | |
f6d3e3e4 SH |
3127 | return -1; |
3128 | } | |
3129 | } | |
3130 | ||
c4d10a05 SH |
3131 | if (chown_mapped_root(c->console.name, c) < 0) { |
3132 | ERROR("Failed to chown %s", c->console.name); | |
3133 | return -1; | |
3134 | } | |
3135 | ||
f6d3e3e4 SH |
3136 | return 0; |
3137 | } | |
3138 | ||
368bbc02 | 3139 | int lxc_setup(const char *name, struct lxc_conf *lxc_conf, const char *lxcpath, struct cgroup_process_info *cgroup_info) |
0ad19a3f | 3140 | { |
571e6ec8 | 3141 | if (setup_utsname(lxc_conf->utsname)) { |
36eb9bde | 3142 | ERROR("failed to setup the utsname for '%s'", name); |
95b5ffaf | 3143 | return -1; |
0ad19a3f | 3144 | } |
3145 | ||
5f4535a3 | 3146 | if (setup_network(&lxc_conf->network)) { |
36eb9bde | 3147 | ERROR("failed to setup the network for '%s'", name); |
95b5ffaf | 3148 | return -1; |
0ad19a3f | 3149 | } |
3150 | ||
283678ed | 3151 | if (run_lxc_hooks(name, "pre-mount", lxc_conf, lxcpath, NULL)) { |
89eaa05e SH |
3152 | ERROR("failed to run pre-mount hooks for container '%s'.", name); |
3153 | return -1; | |
3154 | } | |
5ea6163a | 3155 | |
cc28d0b0 | 3156 | if (setup_rootfs(lxc_conf)) { |
ac778708 | 3157 | ERROR("failed to setup rootfs for '%s'", name); |
95b5ffaf | 3158 | return -1; |
0ad19a3f | 3159 | } |
3160 | ||
c6883f38 | 3161 | if (lxc_conf->autodev) { |
91c3830e SH |
3162 | if (mount_autodev(lxc_conf->rootfs.mount)) { |
3163 | ERROR("failed to mount /dev in the container"); | |
c6883f38 SH |
3164 | return -1; |
3165 | } | |
3166 | } | |
3167 | ||
368bbc02 CS |
3168 | /* do automatic mounts (mainly /proc and /sys), but exclude |
3169 | * those that need to wait until other stuff has finished | |
3170 | */ | |
b06b8511 | 3171 | if (lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & ~LXC_AUTO_CGROUP_MASK, cgroup_info) < 0) { |
368bbc02 CS |
3172 | ERROR("failed to setup the automatic mounts for '%s'", name); |
3173 | return -1; | |
3174 | } | |
3175 | ||
80a881b2 | 3176 | if (setup_mount(&lxc_conf->rootfs, lxc_conf->fstab, name)) { |
36eb9bde | 3177 | ERROR("failed to setup the mounts for '%s'", name); |
95b5ffaf | 3178 | return -1; |
576f946d | 3179 | } |
3180 | ||
c1dc38c2 | 3181 | if (!lxc_list_empty(&lxc_conf->mount_list) && setup_mount_entries(&lxc_conf->rootfs, &lxc_conf->mount_list, name)) { |
e7938e9e MN |
3182 | ERROR("failed to setup the mount entries for '%s'", name); |
3183 | return -1; | |
3184 | } | |
3185 | ||
368bbc02 CS |
3186 | /* now mount only cgroup, if wanted; |
3187 | * before, /sys could not have been mounted | |
3188 | * (is either mounted automatically or via fstab entries) | |
3189 | */ | |
b06b8511 | 3190 | if (lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & LXC_AUTO_CGROUP_MASK, cgroup_info) < 0) { |
368bbc02 CS |
3191 | ERROR("failed to setup the automatic mounts for '%s'", name); |
3192 | return -1; | |
3193 | } | |
3194 | ||
283678ed | 3195 | if (run_lxc_hooks(name, "mount", lxc_conf, lxcpath, NULL)) { |
773fb9ca SH |
3196 | ERROR("failed to run mount hooks for container '%s'.", name); |
3197 | return -1; | |
3198 | } | |
3199 | ||
91c3830e | 3200 | if (lxc_conf->autodev) { |
283678ed | 3201 | if (run_lxc_hooks(name, "autodev", lxc_conf, lxcpath, NULL)) { |
f7bee6c6 MW |
3202 | ERROR("failed to run autodev hooks for container '%s'.", name); |
3203 | return -1; | |
3204 | } | |
91c3830e SH |
3205 | if (setup_autodev(lxc_conf->rootfs.mount)) { |
3206 | ERROR("failed to populate /dev in the container"); | |
3207 | return -1; | |
3208 | } | |
3209 | } | |
368bbc02 | 3210 | |
37903589 | 3211 | if (!lxc_conf->is_execute && setup_console(&lxc_conf->rootfs, &lxc_conf->console, lxc_conf->ttydir)) { |
36eb9bde | 3212 | ERROR("failed to setup the console for '%s'", name); |
95b5ffaf | 3213 | return -1; |
6e590161 | 3214 | } |
3215 | ||
7e0e1d94 AV |
3216 | if (lxc_conf->kmsg) { |
3217 | if (setup_kmsg(&lxc_conf->rootfs, &lxc_conf->console)) // don't fail | |
3218 | ERROR("failed to setup kmsg for '%s'", name); | |
3219 | } | |
1bd051a6 | 3220 | |
37903589 | 3221 | if (!lxc_conf->is_execute && setup_tty(&lxc_conf->rootfs, &lxc_conf->tty_info, lxc_conf->ttydir)) { |
36eb9bde | 3222 | ERROR("failed to setup the ttys for '%s'", name); |
95b5ffaf | 3223 | return -1; |
b0a33c1e | 3224 | } |
3225 | ||
fe4de9a6 DE |
3226 | /* mount /proc if needed for LSM transition */ |
3227 | if (lsm_proc_mount(lxc_conf) < 0) { | |
3228 | ERROR("failed to LSM mount proc for '%s'", name); | |
e075f5d9 | 3229 | return -1; |
e075f5d9 | 3230 | } |
e075f5d9 | 3231 | |
ac778708 | 3232 | if (setup_pivot_root(&lxc_conf->rootfs)) { |
36eb9bde | 3233 | ERROR("failed to set rootfs for '%s'", name); |
95b5ffaf | 3234 | return -1; |
ed502555 | 3235 | } |
3236 | ||
571e6ec8 | 3237 | if (setup_pts(lxc_conf->pts)) { |
36eb9bde | 3238 | ERROR("failed to setup the new pts instance"); |
95b5ffaf | 3239 | return -1; |
3c26f34e | 3240 | } |
3241 | ||
cccc74b5 DL |
3242 | if (setup_personality(lxc_conf->personality)) { |
3243 | ERROR("failed to setup personality"); | |
3244 | return -1; | |
3245 | } | |
3246 | ||
f6d3e3e4 | 3247 | if (lxc_list_empty(&lxc_conf->id_map)) { |
1fb86a7c SH |
3248 | if (!lxc_list_empty(&lxc_conf->keepcaps)) { |
3249 | if (!lxc_list_empty(&lxc_conf->caps)) { | |
3250 | ERROR("Simultaneously requested dropping and keeping caps"); | |
3251 | return -1; | |
3252 | } | |
3253 | if (dropcaps_except(&lxc_conf->keepcaps)) { | |
3254 | ERROR("failed to keep requested caps\n"); | |
3255 | return -1; | |
3256 | } | |
3257 | } else if (setup_caps(&lxc_conf->caps)) { | |
f6d3e3e4 SH |
3258 | ERROR("failed to drop capabilities"); |
3259 | return -1; | |
3260 | } | |
81810dd1 DL |
3261 | } |
3262 | ||
cd54d859 DL |
3263 | NOTICE("'%s' is setup.", name); |
3264 | ||
0ad19a3f | 3265 | return 0; |
3266 | } | |
26ddeedd | 3267 | |
283678ed SH |
3268 | int run_lxc_hooks(const char *name, char *hook, struct lxc_conf *conf, |
3269 | const char *lxcpath, char *argv[]) | |
26ddeedd SH |
3270 | { |
3271 | int which = -1; | |
3272 | struct lxc_list *it; | |
3273 | ||
3274 | if (strcmp(hook, "pre-start") == 0) | |
3275 | which = LXCHOOK_PRESTART; | |
5ea6163a SH |
3276 | else if (strcmp(hook, "pre-mount") == 0) |
3277 | which = LXCHOOK_PREMOUNT; | |
26ddeedd SH |
3278 | else if (strcmp(hook, "mount") == 0) |
3279 | which = LXCHOOK_MOUNT; | |
f7bee6c6 MW |
3280 | else if (strcmp(hook, "autodev") == 0) |
3281 | which = LXCHOOK_AUTODEV; | |
26ddeedd SH |
3282 | else if (strcmp(hook, "start") == 0) |
3283 | which = LXCHOOK_START; | |
3284 | else if (strcmp(hook, "post-stop") == 0) | |
3285 | which = LXCHOOK_POSTSTOP; | |
148e91f5 SH |
3286 | else if (strcmp(hook, "clone") == 0) |
3287 | which = LXCHOOK_CLONE; | |
26ddeedd SH |
3288 | else |
3289 | return -1; | |
3290 | lxc_list_for_each(it, &conf->hooks[which]) { | |
3291 | int ret; | |
3292 | char *hookname = it->elem; | |
283678ed | 3293 | ret = run_script_argv(name, "lxc", hookname, hook, lxcpath, argv); |
26ddeedd SH |
3294 | if (ret) |
3295 | return ret; | |
3296 | } | |
3297 | return 0; | |
3298 | } | |
72d0e1cb | 3299 | |
427b3a21 | 3300 | static void lxc_remove_nic(struct lxc_list *it) |
72d0e1cb SG |
3301 | { |
3302 | struct lxc_netdev *netdev = it->elem; | |
9ebb03ad | 3303 | struct lxc_list *it2,*next; |
72d0e1cb SG |
3304 | |
3305 | lxc_list_del(it); | |
3306 | ||
3307 | if (netdev->link) | |
3308 | free(netdev->link); | |
3309 | if (netdev->name) | |
3310 | free(netdev->name); | |
c9bb9a85 DE |
3311 | if (netdev->type == LXC_NET_VETH && netdev->priv.veth_attr.pair) |
3312 | free(netdev->priv.veth_attr.pair); | |
72d0e1cb SG |
3313 | if (netdev->upscript) |
3314 | free(netdev->upscript); | |
3315 | if (netdev->hwaddr) | |
3316 | free(netdev->hwaddr); | |
3317 | if (netdev->mtu) | |
3318 | free(netdev->mtu); | |
3319 | if (netdev->ipv4_gateway) | |
3320 | free(netdev->ipv4_gateway); | |
3321 | if (netdev->ipv6_gateway) | |
3322 | free(netdev->ipv6_gateway); | |
9ebb03ad | 3323 | lxc_list_for_each_safe(it2, &netdev->ipv4, next) { |
72d0e1cb SG |
3324 | lxc_list_del(it2); |
3325 | free(it2->elem); | |
3326 | free(it2); | |
3327 | } | |
9ebb03ad | 3328 | lxc_list_for_each_safe(it2, &netdev->ipv6, next) { |
72d0e1cb SG |
3329 | lxc_list_del(it2); |
3330 | free(it2->elem); | |
3331 | free(it2); | |
3332 | } | |
d95db067 | 3333 | free(netdev); |
72d0e1cb SG |
3334 | free(it); |
3335 | } | |
3336 | ||
3337 | /* we get passed in something like '0', '0.ipv4' or '1.ipv6' */ | |
12a50cc6 | 3338 | int lxc_clear_nic(struct lxc_conf *c, const char *key) |
72d0e1cb SG |
3339 | { |
3340 | char *p1; | |
3341 | int ret, idx, i; | |
3342 | struct lxc_list *it; | |
3343 | struct lxc_netdev *netdev; | |
3344 | ||
3345 | p1 = index(key, '.'); | |
3346 | if (!p1 || *(p1+1) == '\0') | |
3347 | p1 = NULL; | |
3348 | ||
3349 | ret = sscanf(key, "%d", &idx); | |
3350 | if (ret != 1) return -1; | |
3351 | if (idx < 0) | |
3352 | return -1; | |
3353 | ||
3354 | i = 0; | |
3355 | lxc_list_for_each(it, &c->network) { | |
3356 | if (i == idx) | |
3357 | break; | |
3358 | i++; | |
3359 | } | |
3360 | if (i < idx) // we don't have that many nics defined | |
3361 | return -1; | |
3362 | ||
3363 | if (!it || !it->elem) | |
3364 | return -1; | |
3365 | ||
3366 | netdev = it->elem; | |
3367 | ||
3368 | if (!p1) { | |
3369 | lxc_remove_nic(it); | |
3370 | } else if (strcmp(p1, "ipv4") == 0) { | |
9ebb03ad DE |
3371 | struct lxc_list *it2,*next; |
3372 | lxc_list_for_each_safe(it2, &netdev->ipv4, next) { | |
72d0e1cb SG |
3373 | lxc_list_del(it2); |
3374 | free(it2->elem); | |
3375 | free(it2); | |
3376 | } | |
3377 | } else if (strcmp(p1, "ipv6") == 0) { | |
9ebb03ad DE |
3378 | struct lxc_list *it2,*next; |
3379 | lxc_list_for_each_safe(it2, &netdev->ipv6, next) { | |
72d0e1cb SG |
3380 | lxc_list_del(it2); |
3381 | free(it2->elem); | |
3382 | free(it2); | |
3383 | } | |
3384 | } else if (strcmp(p1, "link") == 0) { | |
3385 | if (netdev->link) { | |
3386 | free(netdev->link); | |
3387 | netdev->link = NULL; | |
3388 | } | |
3389 | } else if (strcmp(p1, "name") == 0) { | |
3390 | if (netdev->name) { | |
3391 | free(netdev->name); | |
3392 | netdev->name = NULL; | |
3393 | } | |
3394 | } else if (strcmp(p1, "script.up") == 0) { | |
3395 | if (netdev->upscript) { | |
3396 | free(netdev->upscript); | |
3397 | netdev->upscript = NULL; | |
3398 | } | |
3399 | } else if (strcmp(p1, "hwaddr") == 0) { | |
3400 | if (netdev->hwaddr) { | |
3401 | free(netdev->hwaddr); | |
3402 | netdev->hwaddr = NULL; | |
3403 | } | |
3404 | } else if (strcmp(p1, "mtu") == 0) { | |
3405 | if (netdev->mtu) { | |
3406 | free(netdev->mtu); | |
3407 | netdev->mtu = NULL; | |
3408 | } | |
3409 | } else if (strcmp(p1, "ipv4_gateway") == 0) { | |
3410 | if (netdev->ipv4_gateway) { | |
3411 | free(netdev->ipv4_gateway); | |
3412 | netdev->ipv4_gateway = NULL; | |
3413 | } | |
3414 | } else if (strcmp(p1, "ipv6_gateway") == 0) { | |
3415 | if (netdev->ipv6_gateway) { | |
3416 | free(netdev->ipv6_gateway); | |
3417 | netdev->ipv6_gateway = NULL; | |
3418 | } | |
3419 | } | |
3420 | else return -1; | |
3421 | ||
3422 | return 0; | |
3423 | } | |
3424 | ||
3425 | int lxc_clear_config_network(struct lxc_conf *c) | |
3426 | { | |
9ebb03ad DE |
3427 | struct lxc_list *it,*next; |
3428 | lxc_list_for_each_safe(it, &c->network, next) { | |
72d0e1cb SG |
3429 | lxc_remove_nic(it); |
3430 | } | |
3431 | return 0; | |
3432 | } | |
3433 | ||
3434 | int lxc_clear_config_caps(struct lxc_conf *c) | |
3435 | { | |
9ebb03ad | 3436 | struct lxc_list *it,*next; |
72d0e1cb | 3437 | |
9ebb03ad | 3438 | lxc_list_for_each_safe(it, &c->caps, next) { |
72d0e1cb SG |
3439 | lxc_list_del(it); |
3440 | free(it->elem); | |
3441 | free(it); | |
3442 | } | |
3443 | return 0; | |
3444 | } | |
3445 | ||
27c27d73 SH |
3446 | int lxc_clear_idmaps(struct lxc_conf *c) |
3447 | { | |
3448 | struct lxc_list *it, *next; | |
3449 | ||
3450 | lxc_list_for_each_safe(it, &c->id_map, next) { | |
3451 | lxc_list_del(it); | |
3452 | free(it->elem); | |
3453 | free(it); | |
3454 | } | |
3455 | return 0; | |
3456 | } | |
3457 | ||
1fb86a7c SH |
3458 | int lxc_clear_config_keepcaps(struct lxc_conf *c) |
3459 | { | |
3460 | struct lxc_list *it,*next; | |
3461 | ||
3462 | lxc_list_for_each_safe(it, &c->keepcaps, next) { | |
3463 | lxc_list_del(it); | |
3464 | free(it->elem); | |
3465 | free(it); | |
3466 | } | |
3467 | return 0; | |
3468 | } | |
3469 | ||
12a50cc6 | 3470 | int lxc_clear_cgroups(struct lxc_conf *c, const char *key) |
72d0e1cb | 3471 | { |
9ebb03ad | 3472 | struct lxc_list *it,*next; |
72d0e1cb | 3473 | bool all = false; |
12a50cc6 | 3474 | const char *k = key + 11; |
72d0e1cb SG |
3475 | |
3476 | if (strcmp(key, "lxc.cgroup") == 0) | |
3477 | all = true; | |
3478 | ||
9ebb03ad | 3479 | lxc_list_for_each_safe(it, &c->cgroup, next) { |
72d0e1cb SG |
3480 | struct lxc_cgroup *cg = it->elem; |
3481 | if (!all && strcmp(cg->subsystem, k) != 0) | |
3482 | continue; | |
3483 | lxc_list_del(it); | |
3484 | free(cg->subsystem); | |
3485 | free(cg->value); | |
3486 | free(cg); | |
3487 | free(it); | |
3488 | } | |
3489 | return 0; | |
3490 | } | |
3491 | ||
3492 | int lxc_clear_mount_entries(struct lxc_conf *c) | |
3493 | { | |
9ebb03ad | 3494 | struct lxc_list *it,*next; |
72d0e1cb | 3495 | |
9ebb03ad | 3496 | lxc_list_for_each_safe(it, &c->mount_list, next) { |
72d0e1cb SG |
3497 | lxc_list_del(it); |
3498 | free(it->elem); | |
3499 | free(it); | |
3500 | } | |
3501 | return 0; | |
3502 | } | |
3503 | ||
12a50cc6 | 3504 | int lxc_clear_hooks(struct lxc_conf *c, const char *key) |
72d0e1cb | 3505 | { |
9ebb03ad | 3506 | struct lxc_list *it,*next; |
17ed13a3 | 3507 | bool all = false, done = false; |
12a50cc6 | 3508 | const char *k = key + 9; |
72d0e1cb SG |
3509 | int i; |
3510 | ||
17ed13a3 SH |
3511 | if (strcmp(key, "lxc.hook") == 0) |
3512 | all = true; | |
3513 | ||
72d0e1cb | 3514 | for (i=0; i<NUM_LXC_HOOKS; i++) { |
17ed13a3 | 3515 | if (all || strcmp(k, lxchook_names[i]) == 0) { |
9ebb03ad | 3516 | lxc_list_for_each_safe(it, &c->hooks[i], next) { |
17ed13a3 SH |
3517 | lxc_list_del(it); |
3518 | free(it->elem); | |
3519 | free(it); | |
3520 | } | |
3521 | done = true; | |
72d0e1cb SG |
3522 | } |
3523 | } | |
17ed13a3 SH |
3524 | |
3525 | if (!done) { | |
3526 | ERROR("Invalid hook key: %s", key); | |
3527 | return -1; | |
3528 | } | |
72d0e1cb SG |
3529 | return 0; |
3530 | } | |
8eb5694b | 3531 | |
7b35f3d6 SH |
3532 | void lxc_clear_saved_nics(struct lxc_conf *conf) |
3533 | { | |
3534 | int i; | |
3535 | ||
3536 | if (!conf->num_savednics) | |
3537 | return; | |
3538 | for (i=0; i < conf->num_savednics; i++) | |
3539 | free(conf->saved_nics[i].orig_name); | |
3540 | conf->saved_nics = 0; | |
3541 | free(conf->saved_nics); | |
3542 | } | |
3543 | ||
8eb5694b SH |
3544 | void lxc_conf_free(struct lxc_conf *conf) |
3545 | { | |
3546 | if (!conf) | |
3547 | return; | |
3548 | if (conf->console.path) | |
3549 | free(conf->console.path); | |
54c30e29 | 3550 | if (conf->rootfs.mount) |
8eb5694b | 3551 | free(conf->rootfs.mount); |
d95db067 DE |
3552 | if (conf->rootfs.path) |
3553 | free(conf->rootfs.path); | |
3554 | if (conf->utsname) | |
3555 | free(conf->utsname); | |
3556 | if (conf->ttydir) | |
3557 | free(conf->ttydir); | |
3558 | if (conf->fstab) | |
3559 | free(conf->fstab); | |
fc7e8864 WM |
3560 | if (conf->rcfile) |
3561 | free(conf->rcfile); | |
8eb5694b | 3562 | lxc_clear_config_network(conf); |
fe4de9a6 DE |
3563 | if (conf->lsm_aa_profile) |
3564 | free(conf->lsm_aa_profile); | |
3565 | if (conf->lsm_se_context) | |
3566 | free(conf->lsm_se_context); | |
769872f9 | 3567 | lxc_seccomp_free(conf); |
8eb5694b | 3568 | lxc_clear_config_caps(conf); |
1fb86a7c | 3569 | lxc_clear_config_keepcaps(conf); |
8eb5694b | 3570 | lxc_clear_cgroups(conf, "lxc.cgroup"); |
17ed13a3 | 3571 | lxc_clear_hooks(conf, "lxc.hook"); |
8eb5694b | 3572 | lxc_clear_mount_entries(conf); |
7b35f3d6 | 3573 | lxc_clear_saved_nics(conf); |
27c27d73 | 3574 | lxc_clear_idmaps(conf); |
8eb5694b SH |
3575 | free(conf); |
3576 | } |