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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: | |
7 | * Daniel Lezcano <dlezcano at fr.ibm.com> | |
8 | * | |
9 | * This library is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * This library is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with this library; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | */ | |
23 | #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> |
e827ff7e SG |
34 | |
35 | #if HAVE_PTY_H | |
b0a33c1e | 36 | #include <pty.h> |
e827ff7e SG |
37 | #else |
38 | #include <../include/openpty.h> | |
39 | #endif | |
0ad19a3f | 40 | |
b3ecde1e DL |
41 | #include <linux/loop.h> |
42 | ||
0ad19a3f | 43 | #include <sys/types.h> |
44 | #include <sys/utsname.h> | |
45 | #include <sys/param.h> | |
46 | #include <sys/stat.h> | |
47 | #include <sys/socket.h> | |
48 | #include <sys/mount.h> | |
49 | #include <sys/mman.h> | |
81810dd1 | 50 | #include <sys/prctl.h> |
0ad19a3f | 51 | |
52 | #include <arpa/inet.h> | |
53 | #include <fcntl.h> | |
54 | #include <netinet/in.h> | |
55 | #include <net/if.h> | |
6f4a3756 | 56 | #include <libgen.h> |
0ad19a3f | 57 | |
e5bda9ee | 58 | #include "network.h" |
59 | #include "error.h" | |
b2718c72 | 60 | #include "parse.h" |
881450bb | 61 | #include "config.h" |
1b09f2c0 DL |
62 | #include "utils.h" |
63 | #include "conf.h" | |
64 | #include "log.h" | |
65 | #include "lxc.h" /* for lxc_cgroup_set() */ | |
d55bc1ad | 66 | #include "caps.h" /* for lxc_caps_last_cap() */ |
36eb9bde | 67 | |
d0a36f2c SG |
68 | #if HAVE_APPARMOR |
69 | #include <apparmor.h> | |
70 | #endif | |
71 | ||
495d2046 SG |
72 | #if HAVE_SYS_CAPABILITY_H |
73 | #include <sys/capability.h> | |
74 | #endif | |
75 | ||
6ff05e18 SG |
76 | #if HAVE_SYS_PERSONALITY_H |
77 | #include <sys/personality.h> | |
78 | #endif | |
79 | ||
edaf8b1b SG |
80 | #if IS_BIONIC |
81 | #include <../include/lxcmntent.h> | |
82 | #else | |
83 | #include <mntent.h> | |
84 | #endif | |
85 | ||
769872f9 SH |
86 | #include "lxcseccomp.h" |
87 | ||
36eb9bde | 88 | lxc_log_define(lxc_conf, lxc); |
e5bda9ee | 89 | |
0ad19a3f | 90 | #define MAXHWLEN 18 |
91 | #define MAXINDEXLEN 20 | |
442cbbe6 | 92 | #define MAXMTULEN 16 |
0ad19a3f | 93 | #define MAXLINELEN 128 |
94 | ||
968fbd36 SK |
95 | #ifndef MS_DIRSYNC |
96 | #define MS_DIRSYNC 128 | |
97 | #endif | |
98 | ||
fdc03323 DL |
99 | #ifndef MS_REC |
100 | #define MS_REC 16384 | |
101 | #endif | |
102 | ||
c08556c6 DL |
103 | #ifndef MNT_DETACH |
104 | #define MNT_DETACH 2 | |
105 | #endif | |
106 | ||
859a6da0 NC |
107 | #ifndef MS_SLAVE |
108 | #define MS_SLAVE (1<<19) | |
109 | #endif | |
110 | ||
88d413d5 SW |
111 | #ifndef MS_RELATIME |
112 | #define MS_RELATIME (1 << 21) | |
113 | #endif | |
114 | ||
115 | #ifndef MS_STRICTATIME | |
116 | #define MS_STRICTATIME (1 << 24) | |
117 | #endif | |
118 | ||
495d2046 | 119 | #if HAVE_SYS_CAPABILITY_H |
b09094da MN |
120 | #ifndef CAP_SETFCAP |
121 | #define CAP_SETFCAP 31 | |
122 | #endif | |
123 | ||
124 | #ifndef CAP_MAC_OVERRIDE | |
125 | #define CAP_MAC_OVERRIDE 32 | |
126 | #endif | |
127 | ||
128 | #ifndef CAP_MAC_ADMIN | |
129 | #define CAP_MAC_ADMIN 33 | |
130 | #endif | |
495d2046 | 131 | #endif |
b09094da MN |
132 | |
133 | #ifndef PR_CAPBSET_DROP | |
134 | #define PR_CAPBSET_DROP 24 | |
135 | #endif | |
136 | ||
9818cae4 SG |
137 | #ifndef LO_FLAGS_AUTOCLEAR |
138 | #define LO_FLAGS_AUTOCLEAR 4 | |
139 | #endif | |
140 | ||
2d76d1d7 SG |
141 | /* Define pivot_root() if missing from the C library */ |
142 | #ifndef HAVE_PIVOT_ROOT | |
143 | static int pivot_root(const char * new_root, const char * put_old) | |
144 | { | |
145 | #ifdef __NR_pivot_root | |
146 | return syscall(__NR_pivot_root, new_root, put_old); | |
147 | #else | |
148 | errno = ENOSYS; | |
149 | return -1; | |
150 | #endif | |
151 | } | |
152 | #else | |
153 | extern int pivot_root(const char * new_root, const char * put_old); | |
154 | #endif | |
155 | ||
156 | /* Define sethostname() if missing from the C library */ | |
157 | #ifndef HAVE_SETHOSTNAME | |
158 | static int sethostname(const char * name, size_t len) | |
159 | { | |
160 | #ifdef __NR_sethostname | |
161 | return syscall(__NR_sethostname, name, len); | |
162 | #else | |
163 | errno = ENOSYS; | |
164 | return -1; | |
165 | #endif | |
166 | } | |
167 | #endif | |
168 | ||
72f919c4 SG |
169 | /* Define __S_ISTYPE if missing from the C library */ |
170 | #ifndef __S_ISTYPE | |
171 | #define __S_ISTYPE(mode, mask) (((mode) & S_IFMT) == (mask)) | |
172 | #endif | |
173 | ||
72d0e1cb | 174 | char *lxchook_names[NUM_LXC_HOOKS] = { |
f7bee6c6 | 175 | "pre-start", "pre-mount", "mount", "autodev", "start", "post-stop" }; |
72d0e1cb | 176 | |
e3b4c4c4 | 177 | typedef int (*instanciate_cb)(struct lxc_handler *, struct lxc_netdev *); |
0ad19a3f | 178 | |
998ac676 RT |
179 | struct mount_opt { |
180 | char *name; | |
181 | int clear; | |
182 | int flag; | |
183 | }; | |
184 | ||
81810dd1 DL |
185 | struct caps_opt { |
186 | char *name; | |
187 | int value; | |
188 | }; | |
189 | ||
e3b4c4c4 ST |
190 | static int instanciate_veth(struct lxc_handler *, struct lxc_netdev *); |
191 | static int instanciate_macvlan(struct lxc_handler *, struct lxc_netdev *); | |
192 | static int instanciate_vlan(struct lxc_handler *, struct lxc_netdev *); | |
193 | static int instanciate_phys(struct lxc_handler *, struct lxc_netdev *); | |
194 | static int instanciate_empty(struct lxc_handler *, struct lxc_netdev *); | |
82d5ae15 | 195 | |
24654103 DL |
196 | static instanciate_cb netdev_conf[LXC_NET_MAXCONFTYPE + 1] = { |
197 | [LXC_NET_VETH] = instanciate_veth, | |
198 | [LXC_NET_MACVLAN] = instanciate_macvlan, | |
199 | [LXC_NET_VLAN] = instanciate_vlan, | |
200 | [LXC_NET_PHYS] = instanciate_phys, | |
201 | [LXC_NET_EMPTY] = instanciate_empty, | |
0ad19a3f | 202 | }; |
203 | ||
74a2b586 JK |
204 | static int shutdown_veth(struct lxc_handler *, struct lxc_netdev *); |
205 | static int shutdown_macvlan(struct lxc_handler *, struct lxc_netdev *); | |
206 | static int shutdown_vlan(struct lxc_handler *, struct lxc_netdev *); | |
207 | static int shutdown_phys(struct lxc_handler *, struct lxc_netdev *); | |
208 | static int shutdown_empty(struct lxc_handler *, struct lxc_netdev *); | |
209 | ||
210 | static instanciate_cb netdev_deconf[LXC_NET_MAXCONFTYPE + 1] = { | |
211 | [LXC_NET_VETH] = shutdown_veth, | |
212 | [LXC_NET_MACVLAN] = shutdown_macvlan, | |
213 | [LXC_NET_VLAN] = shutdown_vlan, | |
214 | [LXC_NET_PHYS] = shutdown_phys, | |
215 | [LXC_NET_EMPTY] = shutdown_empty, | |
216 | }; | |
217 | ||
998ac676 | 218 | static struct mount_opt mount_opt[] = { |
88d413d5 SW |
219 | { "defaults", 0, 0 }, |
220 | { "ro", 0, MS_RDONLY }, | |
221 | { "rw", 1, MS_RDONLY }, | |
222 | { "suid", 1, MS_NOSUID }, | |
223 | { "nosuid", 0, MS_NOSUID }, | |
224 | { "dev", 1, MS_NODEV }, | |
225 | { "nodev", 0, MS_NODEV }, | |
226 | { "exec", 1, MS_NOEXEC }, | |
227 | { "noexec", 0, MS_NOEXEC }, | |
228 | { "sync", 0, MS_SYNCHRONOUS }, | |
229 | { "async", 1, MS_SYNCHRONOUS }, | |
230 | { "dirsync", 0, MS_DIRSYNC }, | |
231 | { "remount", 0, MS_REMOUNT }, | |
232 | { "mand", 0, MS_MANDLOCK }, | |
233 | { "nomand", 1, MS_MANDLOCK }, | |
234 | { "atime", 1, MS_NOATIME }, | |
235 | { "noatime", 0, MS_NOATIME }, | |
236 | { "diratime", 1, MS_NODIRATIME }, | |
237 | { "nodiratime", 0, MS_NODIRATIME }, | |
238 | { "bind", 0, MS_BIND }, | |
239 | { "rbind", 0, MS_BIND|MS_REC }, | |
240 | { "relatime", 0, MS_RELATIME }, | |
241 | { "norelatime", 1, MS_RELATIME }, | |
242 | { "strictatime", 0, MS_STRICTATIME }, | |
243 | { "nostrictatime", 1, MS_STRICTATIME }, | |
244 | { NULL, 0, 0 }, | |
998ac676 RT |
245 | }; |
246 | ||
495d2046 | 247 | #if HAVE_SYS_CAPABILITY_H |
81810dd1 | 248 | static struct caps_opt caps_opt[] = { |
a6afdde9 | 249 | { "chown", CAP_CHOWN }, |
1e11be34 DL |
250 | { "dac_override", CAP_DAC_OVERRIDE }, |
251 | { "dac_read_search", CAP_DAC_READ_SEARCH }, | |
252 | { "fowner", CAP_FOWNER }, | |
253 | { "fsetid", CAP_FSETID }, | |
81810dd1 DL |
254 | { "kill", CAP_KILL }, |
255 | { "setgid", CAP_SETGID }, | |
256 | { "setuid", CAP_SETUID }, | |
257 | { "setpcap", CAP_SETPCAP }, | |
258 | { "linux_immutable", CAP_LINUX_IMMUTABLE }, | |
259 | { "net_bind_service", CAP_NET_BIND_SERVICE }, | |
260 | { "net_broadcast", CAP_NET_BROADCAST }, | |
261 | { "net_admin", CAP_NET_ADMIN }, | |
262 | { "net_raw", CAP_NET_RAW }, | |
263 | { "ipc_lock", CAP_IPC_LOCK }, | |
264 | { "ipc_owner", CAP_IPC_OWNER }, | |
265 | { "sys_module", CAP_SYS_MODULE }, | |
266 | { "sys_rawio", CAP_SYS_RAWIO }, | |
267 | { "sys_chroot", CAP_SYS_CHROOT }, | |
268 | { "sys_ptrace", CAP_SYS_PTRACE }, | |
269 | { "sys_pacct", CAP_SYS_PACCT }, | |
270 | { "sys_admin", CAP_SYS_ADMIN }, | |
271 | { "sys_boot", CAP_SYS_BOOT }, | |
272 | { "sys_nice", CAP_SYS_NICE }, | |
273 | { "sys_resource", CAP_SYS_RESOURCE }, | |
274 | { "sys_time", CAP_SYS_TIME }, | |
275 | { "sys_tty_config", CAP_SYS_TTY_CONFIG }, | |
276 | { "mknod", CAP_MKNOD }, | |
277 | { "lease", CAP_LEASE }, | |
9527e566 | 278 | #ifdef CAP_AUDIT_WRITE |
81810dd1 | 279 | { "audit_write", CAP_AUDIT_WRITE }, |
9527e566 FW |
280 | #endif |
281 | #ifdef CAP_AUDIT_CONTROL | |
81810dd1 | 282 | { "audit_control", CAP_AUDIT_CONTROL }, |
9527e566 | 283 | #endif |
81810dd1 DL |
284 | { "setfcap", CAP_SETFCAP }, |
285 | { "mac_override", CAP_MAC_OVERRIDE }, | |
286 | { "mac_admin", CAP_MAC_ADMIN }, | |
5170c716 CS |
287 | #ifdef CAP_SYSLOG |
288 | { "syslog", CAP_SYSLOG }, | |
289 | #endif | |
290 | #ifdef CAP_WAKE_ALARM | |
291 | { "wake_alarm", CAP_WAKE_ALARM }, | |
292 | #endif | |
81810dd1 | 293 | }; |
495d2046 SG |
294 | #else |
295 | static struct caps_opt caps_opt[] = {}; | |
296 | #endif | |
81810dd1 | 297 | |
91c3830e SH |
298 | static int run_buffer(char *buffer) |
299 | { | |
300 | FILE *f; | |
301 | char *output; | |
302 | ||
303 | f = popen(buffer, "r"); | |
304 | if (!f) { | |
305 | SYSERROR("popen failed"); | |
306 | return -1; | |
307 | } | |
308 | ||
309 | output = malloc(LXC_LOG_BUFFER_SIZE); | |
310 | if (!output) { | |
311 | ERROR("failed to allocate memory for script output"); | |
312 | return -1; | |
313 | } | |
314 | ||
315 | while(fgets(output, LXC_LOG_BUFFER_SIZE, f)) | |
316 | DEBUG("script output: %s", output); | |
317 | ||
318 | free(output); | |
319 | ||
320 | if (pclose(f) == -1) { | |
321 | SYSERROR("Script exited on error"); | |
322 | return -1; | |
323 | } | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
751d9dcd DL |
328 | static int run_script(const char *name, const char *section, |
329 | const char *script, ...) | |
e3b4c4c4 | 330 | { |
abbfd20b | 331 | int ret; |
91c3830e | 332 | char *buffer, *p; |
abbfd20b DL |
333 | size_t size = 0; |
334 | va_list ap; | |
751d9dcd DL |
335 | |
336 | INFO("Executing script '%s' for container '%s', config section '%s'", | |
337 | script, name, section); | |
e3b4c4c4 | 338 | |
abbfd20b DL |
339 | va_start(ap, script); |
340 | while ((p = va_arg(ap, char *))) | |
95642a10 | 341 | size += strlen(p) + 1; |
abbfd20b DL |
342 | va_end(ap); |
343 | ||
344 | size += strlen(script); | |
345 | size += strlen(name); | |
346 | size += strlen(section); | |
95642a10 | 347 | size += 3; |
abbfd20b | 348 | |
95642a10 MS |
349 | if (size > INT_MAX) |
350 | return -1; | |
351 | ||
352 | buffer = alloca(size); | |
abbfd20b DL |
353 | if (!buffer) { |
354 | ERROR("failed to allocate memory"); | |
751d9dcd DL |
355 | return -1; |
356 | } | |
357 | ||
9ba8130c SH |
358 | ret = snprintf(buffer, size, "%s %s %s", script, name, section); |
359 | if (ret < 0 || ret >= size) { | |
360 | ERROR("Script name too long"); | |
361 | free(buffer); | |
362 | return -1; | |
363 | } | |
751d9dcd | 364 | |
abbfd20b | 365 | va_start(ap, script); |
9ba8130c SH |
366 | while ((p = va_arg(ap, char *))) { |
367 | int len = size-ret; | |
368 | int rc; | |
369 | rc = snprintf(buffer + ret, len, " %s", p); | |
370 | if (rc < 0 || rc >= len) { | |
371 | free(buffer); | |
372 | ERROR("Script args too long"); | |
373 | return -1; | |
374 | } | |
375 | ret += rc; | |
376 | } | |
abbfd20b | 377 | va_end(ap); |
751d9dcd | 378 | |
91c3830e | 379 | return run_buffer(buffer); |
e3b4c4c4 ST |
380 | } |
381 | ||
a6afdde9 | 382 | static int find_fstype_cb(char* buffer, void *data) |
78ae2fcc | 383 | { |
384 | struct cbarg { | |
385 | const char *rootfs; | |
a6afdde9 | 386 | const char *target; |
78ae2fcc | 387 | int mntopt; |
388 | } *cbarg = data; | |
389 | ||
390 | char *fstype; | |
391 | ||
392 | /* we don't try 'nodev' entries */ | |
393 | if (strstr(buffer, "nodev")) | |
394 | return 0; | |
395 | ||
396 | fstype = buffer; | |
b2718c72 | 397 | fstype += lxc_char_left_gc(fstype, strlen(fstype)); |
398 | fstype[lxc_char_right_gc(fstype, strlen(fstype))] = '\0'; | |
78ae2fcc | 399 | |
a6afdde9 DL |
400 | DEBUG("trying to mount '%s'->'%s' with fstype '%s'", |
401 | cbarg->rootfs, cbarg->target, fstype); | |
402 | ||
403 | if (mount(cbarg->rootfs, cbarg->target, fstype, cbarg->mntopt, NULL)) { | |
404 | DEBUG("mount failed with error: %s", strerror(errno)); | |
78ae2fcc | 405 | return 0; |
a6afdde9 | 406 | } |
78ae2fcc | 407 | |
a6afdde9 DL |
408 | INFO("mounted '%s' on '%s', with fstype '%s'", |
409 | cbarg->rootfs, cbarg->target, fstype); | |
78ae2fcc | 410 | |
411 | return 1; | |
412 | } | |
413 | ||
2656d231 | 414 | static int mount_unknow_fs(const char *rootfs, const char *target, int mntopt) |
78ae2fcc | 415 | { |
a6afdde9 | 416 | int i; |
78ae2fcc | 417 | |
418 | struct cbarg { | |
419 | const char *rootfs; | |
a6afdde9 | 420 | const char *target; |
78ae2fcc | 421 | int mntopt; |
422 | } cbarg = { | |
423 | .rootfs = rootfs, | |
a6afdde9 | 424 | .target = target, |
78ae2fcc | 425 | .mntopt = mntopt, |
426 | }; | |
427 | ||
a6afdde9 DL |
428 | /* |
429 | * find the filesystem type with brute force: | |
430 | * first we check with /etc/filesystems, in case the modules | |
78ae2fcc | 431 | * are auto-loaded and fall back to the supported kernel fs |
432 | */ | |
433 | char *fsfile[] = { | |
434 | "/etc/filesystems", | |
435 | "/proc/filesystems", | |
436 | }; | |
437 | ||
a6afdde9 DL |
438 | for (i = 0; i < sizeof(fsfile)/sizeof(fsfile[0]); i++) { |
439 | ||
440 | int ret; | |
441 | ||
442 | if (access(fsfile[i], F_OK)) | |
443 | continue; | |
444 | ||
445 | ret = lxc_file_for_each_line(fsfile[i], find_fstype_cb, &cbarg); | |
446 | if (ret < 0) { | |
447 | ERROR("failed to parse '%s'", fsfile[i]); | |
448 | return -1; | |
449 | } | |
450 | ||
451 | if (ret) | |
452 | return 0; | |
78ae2fcc | 453 | } |
454 | ||
a6afdde9 DL |
455 | ERROR("failed to determine fs type for '%s'", rootfs); |
456 | return -1; | |
457 | } | |
458 | ||
2656d231 | 459 | static int mount_rootfs_dir(const char *rootfs, const char *target) |
a6afdde9 DL |
460 | { |
461 | return mount(rootfs, target, "none", MS_BIND | MS_REC, NULL); | |
462 | } | |
463 | ||
464 | static int setup_lodev(const char *rootfs, int fd, struct loop_info64 *loinfo) | |
465 | { | |
466 | int rfd; | |
467 | int ret = -1; | |
468 | ||
469 | rfd = open(rootfs, O_RDWR); | |
470 | if (rfd < 0) { | |
471 | SYSERROR("failed to open '%s'", rootfs); | |
78ae2fcc | 472 | return -1; |
473 | } | |
474 | ||
a6afdde9 | 475 | memset(loinfo, 0, sizeof(*loinfo)); |
78ae2fcc | 476 | |
a6afdde9 | 477 | loinfo->lo_flags = LO_FLAGS_AUTOCLEAR; |
78ae2fcc | 478 | |
a6afdde9 DL |
479 | if (ioctl(fd, LOOP_SET_FD, rfd)) { |
480 | SYSERROR("failed to LOOP_SET_FD"); | |
481 | goto out; | |
78ae2fcc | 482 | } |
483 | ||
a6afdde9 DL |
484 | if (ioctl(fd, LOOP_SET_STATUS64, loinfo)) { |
485 | SYSERROR("failed to LOOP_SET_STATUS64"); | |
78ae2fcc | 486 | goto out; |
487 | } | |
488 | ||
a6afdde9 | 489 | ret = 0; |
78ae2fcc | 490 | out: |
a6afdde9 | 491 | close(rfd); |
78ae2fcc | 492 | |
a6afdde9 | 493 | return ret; |
78ae2fcc | 494 | } |
495 | ||
2656d231 | 496 | static int mount_rootfs_file(const char *rootfs, const char *target) |
78ae2fcc | 497 | { |
a6afdde9 DL |
498 | struct dirent dirent, *direntp; |
499 | struct loop_info64 loinfo; | |
9ba8130c | 500 | int ret = -1, fd = -1, rc; |
a6afdde9 DL |
501 | DIR *dir; |
502 | char path[MAXPATHLEN]; | |
78ae2fcc | 503 | |
a6afdde9 DL |
504 | dir = opendir("/dev"); |
505 | if (!dir) { | |
506 | SYSERROR("failed to open '/dev'"); | |
78ae2fcc | 507 | return -1; |
508 | } | |
509 | ||
a6afdde9 DL |
510 | while (!readdir_r(dir, &dirent, &direntp)) { |
511 | ||
512 | if (!direntp) | |
513 | break; | |
514 | ||
515 | if (!strcmp(direntp->d_name, ".")) | |
516 | continue; | |
517 | ||
518 | if (!strcmp(direntp->d_name, "..")) | |
519 | continue; | |
520 | ||
521 | if (strncmp(direntp->d_name, "loop", 4)) | |
522 | continue; | |
523 | ||
9ba8130c SH |
524 | rc = snprintf(path, MAXPATHLEN, "/dev/%s", direntp->d_name); |
525 | if (rc < 0 || rc >= MAXPATHLEN) | |
526 | continue; | |
527 | ||
a6afdde9 DL |
528 | fd = open(path, O_RDWR); |
529 | if (fd < 0) | |
530 | continue; | |
531 | ||
532 | if (ioctl(fd, LOOP_GET_STATUS64, &loinfo) == 0) { | |
533 | close(fd); | |
534 | continue; | |
535 | } | |
536 | ||
537 | if (errno != ENXIO) { | |
538 | WARN("unexpected error for ioctl on '%s': %m", | |
539 | direntp->d_name); | |
540 | continue; | |
541 | } | |
542 | ||
543 | DEBUG("found '%s' free lodev", path); | |
544 | ||
545 | ret = setup_lodev(rootfs, fd, &loinfo); | |
546 | if (!ret) | |
2656d231 | 547 | ret = mount_unknow_fs(path, target, 0); |
a6afdde9 DL |
548 | close(fd); |
549 | ||
550 | break; | |
551 | } | |
552 | ||
553 | if (closedir(dir)) | |
554 | WARN("failed to close directory"); | |
555 | ||
556 | return ret; | |
78ae2fcc | 557 | } |
558 | ||
2656d231 | 559 | static int mount_rootfs_block(const char *rootfs, const char *target) |
a6afdde9 | 560 | { |
2656d231 | 561 | return mount_unknow_fs(rootfs, target, 0); |
a6afdde9 DL |
562 | } |
563 | ||
0c547523 SH |
564 | /* |
565 | * pin_rootfs | |
566 | * if rootfs is a directory, then open ${rootfs}.hold for writing for the | |
567 | * duration of the container run, to prevent the container from marking the | |
568 | * underlying fs readonly on shutdown. | |
569 | * return -1 on error. | |
570 | * return -2 if nothing needed to be pinned. | |
571 | * return an open fd (>=0) if we pinned it. | |
572 | */ | |
573 | int pin_rootfs(const char *rootfs) | |
574 | { | |
575 | char absrootfs[MAXPATHLEN]; | |
576 | char absrootfspin[MAXPATHLEN]; | |
577 | struct stat s; | |
578 | int ret, fd; | |
579 | ||
e99ee0de | 580 | if (rootfs == NULL || strlen(rootfs) == 0) |
0d03360a | 581 | return -2; |
e99ee0de | 582 | |
0c547523 SH |
583 | if (!realpath(rootfs, absrootfs)) { |
584 | SYSERROR("failed to get real path for '%s'", rootfs); | |
585 | return -1; | |
586 | } | |
587 | ||
588 | if (access(absrootfs, F_OK)) { | |
589 | SYSERROR("'%s' is not accessible", absrootfs); | |
590 | return -1; | |
591 | } | |
592 | ||
593 | if (stat(absrootfs, &s)) { | |
594 | SYSERROR("failed to stat '%s'", absrootfs); | |
595 | return -1; | |
596 | } | |
597 | ||
72f919c4 | 598 | if (!S_ISDIR(s.st_mode)) |
0c547523 SH |
599 | return -2; |
600 | ||
601 | ret = snprintf(absrootfspin, MAXPATHLEN, "%s%s", absrootfs, ".hold"); | |
602 | if (ret >= MAXPATHLEN) { | |
603 | SYSERROR("pathname too long for rootfs hold file"); | |
604 | return -1; | |
605 | } | |
606 | ||
607 | fd = open(absrootfspin, O_CREAT | O_RDWR, S_IWUSR|S_IRUSR); | |
608 | INFO("opened %s as fd %d\n", absrootfspin, fd); | |
609 | return fd; | |
610 | } | |
611 | ||
2656d231 | 612 | static int mount_rootfs(const char *rootfs, const char *target) |
0ad19a3f | 613 | { |
b09ef133 | 614 | char absrootfs[MAXPATHLEN]; |
78ae2fcc | 615 | struct stat s; |
a6afdde9 | 616 | int i; |
78ae2fcc | 617 | |
a6afdde9 | 618 | typedef int (*rootfs_cb)(const char *, const char *); |
78ae2fcc | 619 | |
620 | struct rootfs_type { | |
621 | int type; | |
622 | rootfs_cb cb; | |
623 | } rtfs_type[] = { | |
2656d231 DL |
624 | { S_IFDIR, mount_rootfs_dir }, |
625 | { S_IFBLK, mount_rootfs_block }, | |
626 | { S_IFREG, mount_rootfs_file }, | |
78ae2fcc | 627 | }; |
0ad19a3f | 628 | |
4c8ab83b | 629 | if (!realpath(rootfs, absrootfs)) { |
36eb9bde | 630 | SYSERROR("failed to get real path for '%s'", rootfs); |
4c8ab83b | 631 | return -1; |
632 | } | |
b09ef133 | 633 | |
b09ef133 | 634 | if (access(absrootfs, F_OK)) { |
36eb9bde | 635 | SYSERROR("'%s' is not accessible", absrootfs); |
b09ef133 | 636 | return -1; |
637 | } | |
638 | ||
78ae2fcc | 639 | if (stat(absrootfs, &s)) { |
36eb9bde | 640 | SYSERROR("failed to stat '%s'", absrootfs); |
9b0f0477 | 641 | return -1; |
642 | } | |
643 | ||
78ae2fcc | 644 | for (i = 0; i < sizeof(rtfs_type)/sizeof(rtfs_type[0]); i++) { |
9b0f0477 | 645 | |
78ae2fcc | 646 | if (!__S_ISTYPE(s.st_mode, rtfs_type[i].type)) |
647 | continue; | |
9b0f0477 | 648 | |
a6afdde9 | 649 | return rtfs_type[i].cb(absrootfs, target); |
78ae2fcc | 650 | } |
9b0f0477 | 651 | |
36eb9bde | 652 | ERROR("unsupported rootfs type for '%s'", absrootfs); |
78ae2fcc | 653 | return -1; |
0ad19a3f | 654 | } |
655 | ||
4e5440c6 | 656 | static int setup_utsname(struct utsname *utsname) |
0ad19a3f | 657 | { |
4e5440c6 DL |
658 | if (!utsname) |
659 | return 0; | |
0ad19a3f | 660 | |
4e5440c6 DL |
661 | if (sethostname(utsname->nodename, strlen(utsname->nodename))) { |
662 | SYSERROR("failed to set the hostname to '%s'", utsname->nodename); | |
0ad19a3f | 663 | return -1; |
664 | } | |
665 | ||
4e5440c6 | 666 | INFO("'%s' hostname has been setup", utsname->nodename); |
cd54d859 | 667 | |
0ad19a3f | 668 | return 0; |
669 | } | |
670 | ||
33fcb7a0 | 671 | static int setup_tty(const struct lxc_rootfs *rootfs, |
7c6ef2a2 | 672 | const struct lxc_tty_info *tty_info, char *ttydir) |
b0a33c1e | 673 | { |
7c6ef2a2 SH |
674 | char path[MAXPATHLEN], lxcpath[MAXPATHLEN]; |
675 | int i, ret; | |
b0a33c1e | 676 | |
bc9bd0e3 DL |
677 | if (!rootfs->path) |
678 | return 0; | |
679 | ||
b0a33c1e | 680 | for (i = 0; i < tty_info->nbtty; i++) { |
681 | ||
682 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; | |
683 | ||
7c6ef2a2 | 684 | ret = snprintf(path, sizeof(path), "%s/dev/tty%d", |
12297168 | 685 | rootfs->mount, i + 1); |
7c6ef2a2 SH |
686 | if (ret >= sizeof(path)) { |
687 | ERROR("pathname too long for ttys"); | |
688 | return -1; | |
689 | } | |
690 | if (ttydir) { | |
691 | /* create dev/lxc/tty%d" */ | |
9ba8130c | 692 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/dev/%s/tty%d", |
7c6ef2a2 SH |
693 | rootfs->mount, ttydir, i + 1); |
694 | if (ret >= sizeof(lxcpath)) { | |
695 | ERROR("pathname too long for ttys"); | |
696 | return -1; | |
697 | } | |
698 | ret = creat(lxcpath, 0660); | |
699 | if (ret==-1 && errno != EEXIST) { | |
700 | SYSERROR("error creating %s\n", lxcpath); | |
701 | return -1; | |
702 | } | |
703 | close(ret); | |
704 | ret = unlink(path); | |
705 | if (ret && errno != ENOENT) { | |
706 | SYSERROR("error unlinking %s\n", path); | |
707 | return -1; | |
708 | } | |
b0a33c1e | 709 | |
7c6ef2a2 SH |
710 | if (mount(pty_info->name, lxcpath, "none", MS_BIND, 0)) { |
711 | WARN("failed to mount '%s'->'%s'", | |
712 | pty_info->name, path); | |
713 | continue; | |
714 | } | |
13954cce | 715 | |
9ba8130c SH |
716 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/tty%d", ttydir, i+1); |
717 | if (ret >= sizeof(lxcpath)) { | |
718 | ERROR("tty pathname too long"); | |
719 | return -1; | |
720 | } | |
7c6ef2a2 SH |
721 | ret = symlink(lxcpath, path); |
722 | if (ret) { | |
723 | SYSERROR("failed to create symlink for tty %d\n", i+1); | |
724 | return -1; | |
725 | } | |
726 | } else { | |
c6883f38 SH |
727 | /* If we populated /dev, then we need to create /dev/ttyN */ |
728 | if (access(path, F_OK)) { | |
729 | ret = creat(path, 0660); | |
730 | if (ret==-1) { | |
731 | SYSERROR("error creating %s\n", path); | |
732 | /* this isn't fatal, continue */ | |
733 | } else | |
734 | close(ret); | |
735 | } | |
7c6ef2a2 SH |
736 | if (mount(pty_info->name, path, "none", MS_BIND, 0)) { |
737 | WARN("failed to mount '%s'->'%s'", | |
738 | pty_info->name, path); | |
739 | continue; | |
740 | } | |
b0a33c1e | 741 | } |
742 | } | |
743 | ||
cd54d859 DL |
744 | INFO("%d tty(s) has been setup", tty_info->nbtty); |
745 | ||
b0a33c1e | 746 | return 0; |
747 | } | |
748 | ||
7a7ff0c6 | 749 | static int setup_rootfs_pivot_root_cb(char *buffer, void *data) |
bf601689 MH |
750 | { |
751 | struct lxc_list *mountlist, *listentry, *iterator; | |
752 | char *pivotdir, *mountpoint, *mountentry; | |
753 | int found; | |
754 | void **cbparm; | |
755 | ||
756 | mountentry = buffer; | |
757 | cbparm = (void **)data; | |
758 | ||
759 | mountlist = cbparm[0]; | |
760 | pivotdir = cbparm[1]; | |
761 | ||
762 | /* parse entry, first field is mountname, ignore */ | |
763 | mountpoint = strtok(mountentry, " "); | |
764 | if (!mountpoint) | |
765 | return -1; | |
766 | ||
767 | /* second field is mountpoint */ | |
768 | mountpoint = strtok(NULL, " "); | |
769 | if (!mountpoint) | |
770 | return -1; | |
771 | ||
772 | /* only consider mountpoints below old root fs */ | |
773 | if (strncmp(mountpoint, pivotdir, strlen(pivotdir))) | |
774 | return 0; | |
775 | ||
776 | /* filter duplicate mountpoints */ | |
777 | found = 0; | |
778 | lxc_list_for_each(iterator, mountlist) { | |
779 | if (!strcmp(iterator->elem, mountpoint)) { | |
780 | found = 1; | |
781 | break; | |
782 | } | |
783 | } | |
784 | if (found) | |
785 | return 0; | |
786 | ||
787 | /* add entry to list */ | |
788 | listentry = malloc(sizeof(*listentry)); | |
789 | if (!listentry) { | |
790 | SYSERROR("malloc for mountpoint listentry failed"); | |
791 | return -1; | |
792 | } | |
793 | ||
794 | listentry->elem = strdup(mountpoint); | |
795 | if (!listentry->elem) { | |
796 | SYSERROR("strdup failed"); | |
797 | return -1; | |
798 | } | |
799 | lxc_list_add_tail(mountlist, listentry); | |
800 | ||
801 | return 0; | |
802 | } | |
803 | ||
cc6f6dd7 | 804 | static int umount_oldrootfs(const char *oldrootfs) |
bf601689 | 805 | { |
2382ecff | 806 | char path[MAXPATHLEN]; |
bf601689 | 807 | void *cbparm[2]; |
9ebb03ad | 808 | struct lxc_list mountlist, *iterator, *next; |
bf601689 | 809 | int ok, still_mounted, last_still_mounted; |
9ba8130c | 810 | int rc; |
bf601689 MH |
811 | |
812 | /* read and parse /proc/mounts in old root fs */ | |
813 | lxc_list_init(&mountlist); | |
814 | ||
cc6f6dd7 | 815 | /* oldrootfs is on the top tree directory now */ |
9ba8130c SH |
816 | rc = snprintf(path, sizeof(path), "/%s", oldrootfs); |
817 | if (rc >= sizeof(path)) { | |
818 | ERROR("rootfs name too long"); | |
819 | return -1; | |
820 | } | |
bf601689 | 821 | cbparm[0] = &mountlist; |
bf601689 | 822 | |
cc6f6dd7 | 823 | cbparm[1] = strdup(path); |
bf601689 MH |
824 | if (!cbparm[1]) { |
825 | SYSERROR("strdup failed"); | |
826 | return -1; | |
827 | } | |
828 | ||
9ba8130c SH |
829 | rc = snprintf(path, sizeof(path), "%s/proc/mounts", oldrootfs); |
830 | if (rc >= sizeof(path)) { | |
831 | ERROR("container proc/mounts name too long"); | |
832 | return -1; | |
833 | } | |
cc6f6dd7 DL |
834 | |
835 | ok = lxc_file_for_each_line(path, | |
836 | setup_rootfs_pivot_root_cb, &cbparm); | |
bf601689 MH |
837 | if (ok < 0) { |
838 | SYSERROR("failed to read or parse mount list '%s'", path); | |
839 | return -1; | |
840 | } | |
841 | ||
842 | /* umount filesystems until none left or list no longer shrinks */ | |
843 | still_mounted = 0; | |
844 | do { | |
845 | last_still_mounted = still_mounted; | |
846 | still_mounted = 0; | |
847 | ||
9ebb03ad | 848 | lxc_list_for_each_safe(iterator, &mountlist, next) { |
bf601689 | 849 | |
c08556c6 | 850 | /* umount normally */ |
bf601689 MH |
851 | if (!umount(iterator->elem)) { |
852 | DEBUG("umounted '%s'", (char *)iterator->elem); | |
853 | lxc_list_del(iterator); | |
854 | continue; | |
855 | } | |
856 | ||
bf601689 MH |
857 | still_mounted++; |
858 | } | |
7df119ee | 859 | |
bf601689 MH |
860 | } while (still_mounted > 0 && still_mounted != last_still_mounted); |
861 | ||
7df119ee | 862 | |
c08556c6 DL |
863 | lxc_list_for_each(iterator, &mountlist) { |
864 | ||
865 | /* let's try a lazy umount */ | |
866 | if (!umount2(iterator->elem, MNT_DETACH)) { | |
867 | INFO("lazy unmount of '%s'", (char *)iterator->elem); | |
868 | continue; | |
869 | } | |
870 | ||
871 | /* be more brutal (nfs) */ | |
872 | if (!umount2(iterator->elem, MNT_FORCE)) { | |
873 | INFO("forced unmount of '%s'", (char *)iterator->elem); | |
874 | continue; | |
875 | } | |
876 | ||
7df119ee | 877 | WARN("failed to unmount '%s'", (char *)iterator->elem); |
c08556c6 | 878 | } |
bf601689 | 879 | |
cc6f6dd7 DL |
880 | return 0; |
881 | } | |
882 | ||
883 | static int setup_rootfs_pivot_root(const char *rootfs, const char *pivotdir) | |
884 | { | |
885 | char path[MAXPATHLEN]; | |
886 | int remove_pivotdir = 0; | |
9ba8130c | 887 | int rc; |
cc6f6dd7 DL |
888 | |
889 | /* change into new root fs */ | |
890 | if (chdir(rootfs)) { | |
891 | SYSERROR("can't chdir to new rootfs '%s'", rootfs); | |
892 | return -1; | |
893 | } | |
894 | ||
895 | if (!pivotdir) | |
30c5d292 | 896 | pivotdir = "lxc_putold"; |
cc6f6dd7 | 897 | |
4f9293b1 | 898 | /* compute the full path to pivotdir under rootfs */ |
9ba8130c SH |
899 | rc = snprintf(path, sizeof(path), "%s/%s", rootfs, pivotdir); |
900 | if (rc >= sizeof(path)) { | |
901 | ERROR("pivot dir name too long"); | |
902 | return -1; | |
903 | } | |
cc6f6dd7 DL |
904 | |
905 | if (access(path, F_OK)) { | |
906 | ||
907 | if (mkdir_p(path, 0755)) { | |
908 | SYSERROR("failed to create pivotdir '%s'", path); | |
909 | return -1; | |
910 | } | |
911 | ||
912 | remove_pivotdir = 1; | |
913 | DEBUG("created '%s' directory", path); | |
914 | } | |
915 | ||
916 | DEBUG("mountpoint for old rootfs is '%s'", path); | |
917 | ||
918 | /* pivot_root into our new root fs */ | |
919 | if (pivot_root(".", path)) { | |
920 | SYSERROR("pivot_root syscall failed"); | |
bf601689 MH |
921 | return -1; |
922 | } | |
cc6f6dd7 DL |
923 | |
924 | if (chdir("/")) { | |
925 | SYSERROR("can't chdir to / after pivot_root"); | |
926 | return -1; | |
927 | } | |
928 | ||
929 | DEBUG("pivot_root syscall to '%s' successful", rootfs); | |
930 | ||
931 | /* we switch from absolute path to relative path */ | |
932 | if (umount_oldrootfs(pivotdir)) | |
933 | return -1; | |
bf601689 | 934 | |
c08556c6 DL |
935 | /* remove temporary mount point, we don't consider the removing |
936 | * as fatal */ | |
a91d897a FW |
937 | if (remove_pivotdir && rmdir(pivotdir)) |
938 | WARN("can't remove mountpoint '%s': %m", pivotdir); | |
bf601689 | 939 | |
bf601689 MH |
940 | return 0; |
941 | } | |
942 | ||
91c3830e SH |
943 | /* |
944 | * Do we want to add options for max size of /dev and a file to | |
945 | * specify which devices to create? | |
946 | */ | |
947 | static int mount_autodev(char *root) | |
948 | { | |
949 | int ret; | |
950 | char path[MAXPATHLEN]; | |
951 | ||
952 | INFO("Mounting /dev under %s\n", root); | |
953 | ret = snprintf(path, MAXPATHLEN, "%s/dev", root); | |
954 | if (ret < 0 || ret > MAXPATHLEN) | |
955 | return -1; | |
956 | ret = mount("none", path, "tmpfs", 0, "size=100000"); | |
957 | if (ret) { | |
958 | SYSERROR("Failed to mount /dev at %s\n", root); | |
959 | return -1; | |
960 | } | |
961 | ret = snprintf(path, MAXPATHLEN, "%s/dev/pts", root); | |
962 | if (ret < 0 || ret >= MAXPATHLEN) | |
963 | return -1; | |
964 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); | |
965 | if (ret) { | |
966 | SYSERROR("Failed to create /dev/pts in container"); | |
967 | return -1; | |
968 | } | |
969 | ||
970 | INFO("Mounted /dev under %s\n", root); | |
971 | return 0; | |
972 | } | |
973 | ||
c6883f38 SH |
974 | struct lxc_devs { |
975 | char *name; | |
976 | mode_t mode; | |
977 | int maj; | |
978 | int min; | |
979 | }; | |
980 | ||
981 | struct lxc_devs lxc_devs[] = { | |
982 | { "null", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 3 }, | |
983 | { "zero", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 5 }, | |
984 | { "full", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 7 }, | |
985 | { "urandom", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 9 }, | |
986 | { "random", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 8 }, | |
987 | { "tty", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 5, 0 }, | |
988 | { "console", S_IFCHR | S_IRUSR | S_IWUSR, 5, 1 }, | |
989 | }; | |
990 | ||
c6883f38 SH |
991 | static int setup_autodev(char *root) |
992 | { | |
993 | int ret; | |
994 | struct lxc_devs *d; | |
995 | char path[MAXPATHLEN]; | |
996 | int i; | |
3a32201c | 997 | mode_t cmask; |
c6883f38 | 998 | |
91c3830e SH |
999 | INFO("Creating initial consoles under %s/dev\n", root); |
1000 | ||
c6883f38 | 1001 | ret = snprintf(path, MAXPATHLEN, "%s/dev", root); |
91c3830e SH |
1002 | if (ret < 0 || ret >= MAXPATHLEN) { |
1003 | ERROR("Error calculating container /dev location"); | |
c6883f38 | 1004 | return -1; |
f7bee6c6 | 1005 | } |
91c3830e SH |
1006 | |
1007 | INFO("Populating /dev under %s\n", root); | |
3a32201c | 1008 | cmask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
c6883f38 SH |
1009 | for (i = 0; i < sizeof(lxc_devs) / sizeof(lxc_devs[0]); i++) { |
1010 | d = &lxc_devs[i]; | |
1011 | ret = snprintf(path, MAXPATHLEN, "%s/dev/%s", root, d->name); | |
1012 | if (ret < 0 || ret >= MAXPATHLEN) | |
1013 | return -1; | |
1014 | ret = mknod(path, d->mode, makedev(d->maj, d->min)); | |
91c3830e | 1015 | if (ret && errno != EEXIST) { |
c6883f38 SH |
1016 | SYSERROR("Error creating %s\n", d->name); |
1017 | return -1; | |
1018 | } | |
1019 | } | |
3a32201c | 1020 | umask(cmask); |
c6883f38 SH |
1021 | |
1022 | INFO("Populated /dev under %s\n", root); | |
1023 | return 0; | |
1024 | } | |
1025 | ||
cc28d0b0 SH |
1026 | /* |
1027 | * Detect whether / is mounted MS_SHARED. The only way I know of to | |
1028 | * check that is through /proc/self/mountinfo. | |
1029 | * I'm only checking for /. If the container rootfs or mount location | |
1030 | * is MS_SHARED, but not '/', then you're out of luck - figuring that | |
1031 | * out would be too much work to be worth it. | |
1032 | */ | |
1033 | #define LINELEN 4096 | |
1034 | int detect_shared_rootfs(void) | |
1035 | { | |
1036 | char buf[LINELEN], *p; | |
1037 | FILE *f; | |
1038 | int i; | |
1039 | char *p2; | |
1040 | ||
1041 | f = fopen("/proc/self/mountinfo", "r"); | |
1042 | if (!f) | |
1043 | return 0; | |
1044 | while ((p = fgets(buf, LINELEN, f))) { | |
1045 | INFO("looking at .%s.", p); | |
1046 | for (p = buf, i=0; p && i < 4; i++) | |
1047 | p = index(p+1, ' '); | |
1048 | if (!p) | |
1049 | continue; | |
1050 | p2 = index(p+1, ' '); | |
1051 | if (!p2) | |
1052 | continue; | |
1053 | *p2 = '\0'; | |
1054 | INFO("now p is .%s.", p); | |
1055 | if (strcmp(p+1, "/") == 0) { | |
1056 | // this is '/'. is it shared? | |
1057 | p = index(p2+1, ' '); | |
1058 | if (strstr(p, "shared:")) | |
1059 | return 1; | |
1060 | } | |
1061 | } | |
1062 | fclose(f); | |
1063 | return 0; | |
1064 | } | |
1065 | ||
1066 | /* | |
1067 | * I'll forgive you for asking whether all of this is needed :) The | |
1068 | * answer is yes. | |
1069 | * pivot_root will fail if the new root, the put_old dir, or the parent | |
1070 | * of current->fs->root are MS_SHARED. (parent of current->fs_root may | |
1071 | * or may not be current->fs_root - if we assumed it always was, we could | |
1072 | * just mount --make-rslave /). So, | |
1073 | * 1. mount a tiny tmpfs to be parent of current->fs->root. | |
1074 | * 2. make that MS_SLAVE | |
1075 | * 3. make a 'root' directory under that | |
1076 | * 4. mount --rbind / under the $tinyroot/root. | |
1077 | * 5. make that rslave | |
1078 | * 6. chdir and chroot into $tinyroot/root | |
1079 | * 7. $tinyroot will be unmounted by our parent in start.c | |
1080 | */ | |
1081 | static int chroot_into_slave(struct lxc_conf *conf) | |
1082 | { | |
1083 | char path[MAXPATHLEN]; | |
1084 | const char *destpath = conf->rootfs.mount; | |
1085 | int ret; | |
1086 | ||
1087 | if (mount(destpath, destpath, NULL, MS_BIND, 0)) { | |
1088 | SYSERROR("failed to mount %s bind", destpath); | |
1089 | return -1; | |
1090 | } | |
1091 | if (mount("", destpath, NULL, MS_SLAVE, 0)) { | |
1092 | SYSERROR("failed to make %s slave", destpath); | |
1093 | return -1; | |
1094 | } | |
1095 | if (mount("none", destpath, "tmpfs", 0, "size=10000")) { | |
1096 | SYSERROR("Failed to mount tmpfs / at %s", destpath); | |
1097 | return -1; | |
1098 | } | |
1099 | ret = snprintf(path, MAXPATHLEN, "%s/root", destpath); | |
1100 | if (ret < 0 || ret >= MAXPATHLEN) { | |
1101 | ERROR("out of memory making root path"); | |
1102 | return -1; | |
1103 | } | |
1104 | if (mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH)) { | |
1105 | SYSERROR("Failed to create /dev/pts in container"); | |
1106 | return -1; | |
1107 | } | |
1108 | if (mount("/", path, NULL, MS_BIND|MS_REC, 0)) { | |
1109 | SYSERROR("Failed to rbind mount / to %s", path); | |
1110 | return -1; | |
1111 | } | |
1112 | if (mount("", destpath, NULL, MS_SLAVE|MS_REC, 0)) { | |
1113 | SYSERROR("Failed to make tmp-/ at %s rslave", path); | |
1114 | return -1; | |
1115 | } | |
1116 | if (chdir(path)) { | |
1117 | SYSERROR("Failed to chdir into tmp-/"); | |
1118 | return -1; | |
1119 | } | |
1120 | if (chroot(path)) { | |
1121 | SYSERROR("Failed to chroot into tmp-/"); | |
1122 | return -1; | |
1123 | } | |
1124 | INFO("Chrooted into tmp-/ at %s\n", path); | |
1125 | return 0; | |
1126 | } | |
1127 | ||
1128 | static int setup_rootfs(struct lxc_conf *conf) | |
0ad19a3f | 1129 | { |
cc28d0b0 SH |
1130 | const struct lxc_rootfs *rootfs = &conf->rootfs; |
1131 | ||
33fcb7a0 | 1132 | if (!rootfs->path) |
c69bd12f | 1133 | return 0; |
0ad19a3f | 1134 | |
12297168 | 1135 | if (access(rootfs->mount, F_OK)) { |
b1789442 | 1136 | SYSERROR("failed to access to '%s', check it is present", |
12297168 | 1137 | rootfs->mount); |
b1789442 DL |
1138 | return -1; |
1139 | } | |
1140 | ||
cc28d0b0 SH |
1141 | if (detect_shared_rootfs()) { |
1142 | if (chroot_into_slave(conf)) { | |
1143 | ERROR("Failed to chroot into slave /"); | |
1144 | return -1; | |
1145 | } | |
1146 | } | |
1147 | ||
2656d231 | 1148 | if (mount_rootfs(rootfs->path, rootfs->mount)) { |
a6afdde9 | 1149 | ERROR("failed to mount rootfs"); |
c3f0a28c | 1150 | return -1; |
1151 | } | |
0ad19a3f | 1152 | |
12297168 | 1153 | DEBUG("mounted '%s' on '%s'", rootfs->path, rootfs->mount); |
c69bd12f | 1154 | |
ac778708 DL |
1155 | return 0; |
1156 | } | |
1157 | ||
1158 | int setup_pivot_root(const struct lxc_rootfs *rootfs) | |
1159 | { | |
ac778708 DL |
1160 | if (!rootfs->path) |
1161 | return 0; | |
1162 | ||
12297168 | 1163 | if (setup_rootfs_pivot_root(rootfs->mount, rootfs->pivot)) { |
cc6f6dd7 | 1164 | ERROR("failed to setup pivot root"); |
25368b52 | 1165 | return -1; |
c69bd12f DL |
1166 | } |
1167 | ||
25368b52 | 1168 | return 0; |
0ad19a3f | 1169 | } |
1170 | ||
d852c78c | 1171 | static int setup_pts(int pts) |
3c26f34e | 1172 | { |
77890c6d SW |
1173 | char target[PATH_MAX]; |
1174 | ||
d852c78c DL |
1175 | if (!pts) |
1176 | return 0; | |
3c26f34e | 1177 | |
1178 | if (!access("/dev/pts/ptmx", F_OK) && umount("/dev/pts")) { | |
36eb9bde | 1179 | SYSERROR("failed to umount 'dev/pts'"); |
3c26f34e | 1180 | return -1; |
1181 | } | |
1182 | ||
a6afdde9 DL |
1183 | if (mount("devpts", "/dev/pts", "devpts", MS_MGC_VAL, |
1184 | "newinstance,ptmxmode=0666")) { | |
36eb9bde | 1185 | SYSERROR("failed to mount a new instance of '/dev/pts'"); |
3c26f34e | 1186 | return -1; |
1187 | } | |
1188 | ||
3c26f34e | 1189 | if (access("/dev/ptmx", F_OK)) { |
1190 | if (!symlink("/dev/pts/ptmx", "/dev/ptmx")) | |
1191 | goto out; | |
36eb9bde | 1192 | SYSERROR("failed to symlink '/dev/pts/ptmx'->'/dev/ptmx'"); |
3c26f34e | 1193 | return -1; |
1194 | } | |
1195 | ||
77890c6d SW |
1196 | if (realpath("/dev/ptmx", target) && !strcmp(target, "/dev/pts/ptmx")) |
1197 | goto out; | |
1198 | ||
3c26f34e | 1199 | /* fallback here, /dev/pts/ptmx exists just mount bind */ |
1200 | if (mount("/dev/pts/ptmx", "/dev/ptmx", "none", MS_BIND, 0)) { | |
36eb9bde | 1201 | SYSERROR("mount failed '/dev/pts/ptmx'->'/dev/ptmx'"); |
3c26f34e | 1202 | return -1; |
1203 | } | |
cd54d859 DL |
1204 | |
1205 | INFO("created new pts instance"); | |
d852c78c | 1206 | |
3c26f34e | 1207 | out: |
1208 | return 0; | |
1209 | } | |
1210 | ||
cccc74b5 DL |
1211 | static int setup_personality(int persona) |
1212 | { | |
6ff05e18 | 1213 | #if HAVE_SYS_PERSONALITY_H |
cccc74b5 DL |
1214 | if (persona == -1) |
1215 | return 0; | |
1216 | ||
1217 | if (personality(persona) < 0) { | |
1218 | SYSERROR("failed to set personality to '0x%x'", persona); | |
1219 | return -1; | |
1220 | } | |
1221 | ||
1222 | INFO("set personality to '0x%x'", persona); | |
6ff05e18 | 1223 | #endif |
cccc74b5 DL |
1224 | |
1225 | return 0; | |
1226 | } | |
1227 | ||
7c6ef2a2 | 1228 | static int setup_dev_console(const struct lxc_rootfs *rootfs, |
33fcb7a0 | 1229 | const struct lxc_console *console) |
6e590161 | 1230 | { |
63376d7d DL |
1231 | char path[MAXPATHLEN]; |
1232 | struct stat s; | |
7c6ef2a2 | 1233 | int ret; |
52e35957 | 1234 | |
7c6ef2a2 SH |
1235 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs->mount); |
1236 | if (ret >= sizeof(path)) { | |
1237 | ERROR("console path too long\n"); | |
1238 | return -1; | |
1239 | } | |
52e35957 | 1240 | |
63376d7d | 1241 | if (access(path, F_OK)) { |
466978b0 | 1242 | WARN("rootfs specified but no console found at '%s'", path); |
63376d7d | 1243 | return 0; |
52e35957 DL |
1244 | } |
1245 | ||
f78a1f32 | 1246 | if (console->peer == -1) { |
63376d7d | 1247 | INFO("no console output required"); |
f78a1f32 DL |
1248 | return 0; |
1249 | } | |
ed502555 | 1250 | |
63376d7d DL |
1251 | if (stat(path, &s)) { |
1252 | SYSERROR("failed to stat '%s'", path); | |
1253 | return -1; | |
1254 | } | |
1255 | ||
1256 | if (chmod(console->name, s.st_mode)) { | |
1257 | SYSERROR("failed to set mode '0%o' to '%s'", | |
1258 | s.st_mode, console->name); | |
1259 | return -1; | |
1260 | } | |
13954cce | 1261 | |
63376d7d DL |
1262 | if (mount(console->name, path, "none", MS_BIND, 0)) { |
1263 | ERROR("failed to mount '%s' on '%s'", console->name, path); | |
6e590161 | 1264 | return -1; |
1265 | } | |
1266 | ||
63376d7d | 1267 | INFO("console has been setup"); |
7c6ef2a2 SH |
1268 | return 0; |
1269 | } | |
1270 | ||
1271 | static int setup_ttydir_console(const struct lxc_rootfs *rootfs, | |
1272 | const struct lxc_console *console, | |
1273 | char *ttydir) | |
1274 | { | |
1275 | char path[MAXPATHLEN], lxcpath[MAXPATHLEN]; | |
1276 | int ret; | |
1277 | ||
1278 | /* create rootfs/dev/<ttydir> directory */ | |
1279 | ret = snprintf(path, sizeof(path), "%s/dev/%s", rootfs->mount, | |
1280 | ttydir); | |
1281 | if (ret >= sizeof(path)) | |
1282 | return -1; | |
1283 | ret = mkdir(path, 0755); | |
1284 | if (ret && errno != EEXIST) { | |
1285 | SYSERROR("failed with errno %d to create %s\n", errno, path); | |
1286 | return -1; | |
1287 | } | |
1288 | INFO("created %s\n", path); | |
1289 | ||
1290 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/dev/%s/console", | |
1291 | rootfs->mount, ttydir); | |
1292 | if (ret >= sizeof(lxcpath)) { | |
1293 | ERROR("console path too long\n"); | |
1294 | return -1; | |
1295 | } | |
1296 | ||
1297 | snprintf(path, sizeof(path), "%s/dev/console", rootfs->mount); | |
1298 | ret = unlink(path); | |
1299 | if (ret && errno != ENOENT) { | |
1300 | SYSERROR("error unlinking %s\n", path); | |
1301 | return -1; | |
1302 | } | |
1303 | ||
1304 | ret = creat(lxcpath, 0660); | |
1305 | if (ret==-1 && errno != EEXIST) { | |
1306 | SYSERROR("error %d creating %s\n", errno, lxcpath); | |
1307 | return -1; | |
1308 | } | |
1309 | close(ret); | |
1310 | ||
1311 | if (console->peer == -1) { | |
1312 | INFO("no console output required"); | |
1313 | return 0; | |
1314 | } | |
1315 | ||
1316 | if (mount(console->name, lxcpath, "none", MS_BIND, 0)) { | |
1317 | ERROR("failed to mount '%s' on '%s'", console->name, lxcpath); | |
1318 | return -1; | |
1319 | } | |
1320 | ||
1321 | /* create symlink from rootfs/dev/console to 'lxc/console' */ | |
9ba8130c SH |
1322 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/console", ttydir); |
1323 | if (ret >= sizeof(lxcpath)) { | |
1324 | ERROR("lxc/console path too long"); | |
1325 | return -1; | |
1326 | } | |
7c6ef2a2 SH |
1327 | ret = symlink(lxcpath, path); |
1328 | if (ret) { | |
1329 | SYSERROR("failed to create symlink for console"); | |
1330 | return -1; | |
1331 | } | |
1332 | ||
1333 | INFO("console has been setup on %s", lxcpath); | |
cd54d859 | 1334 | |
6e590161 | 1335 | return 0; |
1336 | } | |
1337 | ||
7c6ef2a2 SH |
1338 | static int setup_console(const struct lxc_rootfs *rootfs, |
1339 | const struct lxc_console *console, | |
1340 | char *ttydir) | |
1341 | { | |
1342 | /* We don't have a rootfs, /dev/console will be shared */ | |
1343 | if (!rootfs->path) | |
1344 | return 0; | |
1345 | if (!ttydir) | |
1346 | return setup_dev_console(rootfs, console); | |
1347 | ||
1348 | return setup_ttydir_console(rootfs, console, ttydir); | |
1349 | } | |
1350 | ||
1bd051a6 SH |
1351 | static int setup_kmsg(const struct lxc_rootfs *rootfs, |
1352 | const struct lxc_console *console) | |
1353 | { | |
1354 | char kpath[MAXPATHLEN]; | |
1355 | int ret; | |
1356 | ||
222fea5a DE |
1357 | if (!rootfs->path) |
1358 | return 0; | |
1bd051a6 SH |
1359 | ret = snprintf(kpath, sizeof(kpath), "%s/dev/kmsg", rootfs->mount); |
1360 | if (ret < 0 || ret >= sizeof(kpath)) | |
1361 | return -1; | |
1362 | ||
1363 | ret = unlink(kpath); | |
1364 | if (ret && errno != ENOENT) { | |
1365 | SYSERROR("error unlinking %s\n", kpath); | |
1366 | return -1; | |
1367 | } | |
1368 | ||
1369 | ret = symlink("console", kpath); | |
1370 | if (ret) { | |
1371 | SYSERROR("failed to create symlink for kmsg"); | |
1372 | return -1; | |
1373 | } | |
1374 | ||
1375 | return 0; | |
1376 | } | |
1377 | ||
ae5c8b8e | 1378 | int setup_cgroup(const char *cgpath, struct lxc_list *cgroups) |
576f946d | 1379 | { |
102a5303 DL |
1380 | struct lxc_list *iterator; |
1381 | struct lxc_cgroup *cg; | |
88329c69 | 1382 | int ret = -1; |
6f4a3756 | 1383 | |
102a5303 DL |
1384 | if (lxc_list_empty(cgroups)) |
1385 | return 0; | |
6f4a3756 | 1386 | |
102a5303 | 1387 | lxc_list_for_each(iterator, cgroups) { |
13954cce | 1388 | |
102a5303 | 1389 | cg = iterator->elem; |
6f4a3756 | 1390 | |
ae5c8b8e SH |
1391 | if (lxc_cgroup_set_bypath(cgpath, cg->subsystem, cg->value)) { |
1392 | ERROR("Error setting %s to %s for %s\n", cg->subsystem, | |
1393 | cg->value, cgpath); | |
88329c69 | 1394 | goto out; |
ae5c8b8e | 1395 | } |
6f4a3756 | 1396 | |
102a5303 | 1397 | DEBUG("cgroup '%s' set to '%s'", cg->subsystem, cg->value); |
6f4a3756 | 1398 | } |
13954cce | 1399 | |
88329c69 | 1400 | ret = 0; |
cd54d859 | 1401 | INFO("cgroup has been setup"); |
88329c69 MN |
1402 | out: |
1403 | return ret; | |
576f946d | 1404 | } |
1405 | ||
998ac676 RT |
1406 | static void parse_mntopt(char *opt, unsigned long *flags, char **data) |
1407 | { | |
1408 | struct mount_opt *mo; | |
1409 | ||
1410 | /* If opt is found in mount_opt, set or clear flags. | |
1411 | * Otherwise append it to data. */ | |
1412 | ||
1413 | for (mo = &mount_opt[0]; mo->name != NULL; mo++) { | |
1414 | if (!strncmp(opt, mo->name, strlen(mo->name))) { | |
1415 | if (mo->clear) | |
1416 | *flags &= ~mo->flag; | |
1417 | else | |
1418 | *flags |= mo->flag; | |
1419 | return; | |
1420 | } | |
1421 | } | |
1422 | ||
1423 | if (strlen(*data)) | |
1424 | strcat(*data, ","); | |
1425 | strcat(*data, opt); | |
1426 | } | |
1427 | ||
911324ef | 1428 | static int parse_mntopts(const char *mntopts, unsigned long *mntflags, |
998ac676 RT |
1429 | char **mntdata) |
1430 | { | |
1431 | char *s, *data; | |
1432 | char *p, *saveptr = NULL; | |
1433 | ||
911324ef | 1434 | *mntdata = NULL; |
91656ce5 | 1435 | *mntflags = 0L; |
911324ef DL |
1436 | |
1437 | if (!mntopts) | |
998ac676 RT |
1438 | return 0; |
1439 | ||
911324ef | 1440 | s = strdup(mntopts); |
998ac676 | 1441 | if (!s) { |
36eb9bde | 1442 | SYSERROR("failed to allocate memory"); |
998ac676 RT |
1443 | return -1; |
1444 | } | |
1445 | ||
1446 | data = malloc(strlen(s) + 1); | |
1447 | if (!data) { | |
36eb9bde | 1448 | SYSERROR("failed to allocate memory"); |
998ac676 RT |
1449 | free(s); |
1450 | return -1; | |
1451 | } | |
1452 | *data = 0; | |
1453 | ||
1454 | for (p = strtok_r(s, ",", &saveptr); p != NULL; | |
1455 | p = strtok_r(NULL, ",", &saveptr)) | |
1456 | parse_mntopt(p, mntflags, &data); | |
1457 | ||
1458 | if (*data) | |
1459 | *mntdata = data; | |
1460 | else | |
1461 | free(data); | |
1462 | free(s); | |
1463 | ||
1464 | return 0; | |
1465 | } | |
1466 | ||
911324ef DL |
1467 | static int mount_entry(const char *fsname, const char *target, |
1468 | const char *fstype, unsigned long mountflags, | |
1469 | const char *data) | |
1470 | { | |
1471 | if (mount(fsname, target, fstype, mountflags & ~MS_REMOUNT, data)) { | |
1472 | SYSERROR("failed to mount '%s' on '%s'", fsname, target); | |
1473 | return -1; | |
1474 | } | |
1475 | ||
1476 | if ((mountflags & MS_REMOUNT) || (mountflags & MS_BIND)) { | |
1477 | ||
1478 | DEBUG("remounting %s on %s to respect bind or remount options", | |
1479 | fsname, target); | |
1480 | ||
1481 | if (mount(fsname, target, fstype, | |
1482 | mountflags | MS_REMOUNT, data)) { | |
1483 | SYSERROR("failed to mount '%s' on '%s'", | |
1484 | fsname, target); | |
1485 | return -1; | |
1486 | } | |
1487 | } | |
1488 | ||
1489 | DEBUG("mounted '%s' on '%s', type '%s'", fsname, target, fstype); | |
1490 | ||
1491 | return 0; | |
1492 | } | |
1493 | ||
1494 | static inline int mount_entry_on_systemfs(struct mntent *mntent) | |
0ad19a3f | 1495 | { |
998ac676 RT |
1496 | unsigned long mntflags; |
1497 | char *mntdata; | |
911324ef DL |
1498 | int ret; |
1499 | ||
1500 | if (parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata) < 0) { | |
1501 | ERROR("failed to parse mount option '%s'", mntent->mnt_opts); | |
1502 | return -1; | |
1503 | } | |
1504 | ||
1505 | ret = mount_entry(mntent->mnt_fsname, mntent->mnt_dir, | |
1506 | mntent->mnt_type, mntflags, mntdata); | |
1507 | ||
68c152ef SH |
1508 | if (hasmntopt(mntent, "optional") != NULL) |
1509 | ret = 0; | |
1510 | ||
911324ef DL |
1511 | free(mntdata); |
1512 | ||
1513 | return ret; | |
1514 | } | |
1515 | ||
1516 | static int mount_entry_on_absolute_rootfs(struct mntent *mntent, | |
80a881b2 SH |
1517 | const struct lxc_rootfs *rootfs, |
1518 | const char *lxc_name) | |
911324ef | 1519 | { |
013bd428 | 1520 | char *aux; |
59760f5d | 1521 | char path[MAXPATHLEN]; |
911324ef DL |
1522 | unsigned long mntflags; |
1523 | char *mntdata; | |
80a881b2 | 1524 | int r, ret = 0, offset; |
67e571de | 1525 | const char *lxcpath; |
0ad19a3f | 1526 | |
911324ef DL |
1527 | if (parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata) < 0) { |
1528 | ERROR("failed to parse mount option '%s'", mntent->mnt_opts); | |
1529 | return -1; | |
1530 | } | |
1bc60a65 | 1531 | |
2a59a681 SH |
1532 | lxcpath = default_lxc_path(); |
1533 | if (!lxcpath) { | |
1534 | ERROR("Out of memory"); | |
1535 | return -1; | |
1536 | } | |
1537 | ||
80a881b2 | 1538 | /* if rootfs->path is a blockdev path, allow container fstab to |
2a59a681 SH |
1539 | * use $lxcpath/CN/rootfs as the target prefix */ |
1540 | r = snprintf(path, MAXPATHLEN, "%s/%s/rootfs", lxcpath, lxc_name); | |
80a881b2 SH |
1541 | if (r < 0 || r >= MAXPATHLEN) |
1542 | goto skipvarlib; | |
1543 | ||
1544 | aux = strstr(mntent->mnt_dir, path); | |
1545 | if (aux) { | |
1546 | offset = strlen(path); | |
1547 | goto skipabs; | |
1548 | } | |
1549 | ||
1550 | skipvarlib: | |
013bd428 DL |
1551 | aux = strstr(mntent->mnt_dir, rootfs->path); |
1552 | if (!aux) { | |
1553 | WARN("ignoring mount point '%s'", mntent->mnt_dir); | |
1554 | goto out; | |
1555 | } | |
80a881b2 SH |
1556 | offset = strlen(rootfs->path); |
1557 | ||
1558 | skipabs: | |
013bd428 | 1559 | |
9ba8130c | 1560 | r = snprintf(path, MAXPATHLEN, "%s/%s", rootfs->mount, |
80a881b2 SH |
1561 | aux + offset); |
1562 | if (r < 0 || r >= MAXPATHLEN) { | |
1563 | WARN("pathnme too long for '%s'", mntent->mnt_dir); | |
1564 | ret = -1; | |
1565 | goto out; | |
1566 | } | |
1567 | ||
d330fe7b | 1568 | |
013bd428 | 1569 | ret = mount_entry(mntent->mnt_fsname, path, mntent->mnt_type, |
911324ef | 1570 | mntflags, mntdata); |
0ad19a3f | 1571 | |
68c152ef SH |
1572 | if (hasmntopt(mntent, "optional") != NULL) |
1573 | ret = 0; | |
1574 | ||
013bd428 | 1575 | out: |
911324ef DL |
1576 | free(mntdata); |
1577 | return ret; | |
1578 | } | |
d330fe7b | 1579 | |
911324ef DL |
1580 | static int mount_entry_on_relative_rootfs(struct mntent *mntent, |
1581 | const char *rootfs) | |
1582 | { | |
1583 | char path[MAXPATHLEN]; | |
1584 | unsigned long mntflags; | |
1585 | char *mntdata; | |
1586 | int ret; | |
d330fe7b | 1587 | |
911324ef DL |
1588 | if (parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata) < 0) { |
1589 | ERROR("failed to parse mount option '%s'", mntent->mnt_opts); | |
1590 | return -1; | |
1591 | } | |
d330fe7b | 1592 | |
911324ef | 1593 | /* relative to root mount point */ |
9ba8130c SH |
1594 | ret = snprintf(path, sizeof(path), "%s/%s", rootfs, mntent->mnt_dir); |
1595 | if (ret >= sizeof(path)) { | |
1596 | ERROR("path name too long"); | |
1597 | return -1; | |
1598 | } | |
911324ef DL |
1599 | |
1600 | ret = mount_entry(mntent->mnt_fsname, path, mntent->mnt_type, | |
1601 | mntflags, mntdata); | |
1602 | ||
68c152ef SH |
1603 | if (hasmntopt(mntent, "optional") != NULL) |
1604 | ret = 0; | |
1605 | ||
911324ef | 1606 | free(mntdata); |
998ac676 | 1607 | |
911324ef DL |
1608 | return ret; |
1609 | } | |
1610 | ||
80a881b2 SH |
1611 | static int mount_file_entries(const struct lxc_rootfs *rootfs, FILE *file, |
1612 | const char *lxc_name) | |
911324ef DL |
1613 | { |
1614 | struct mntent *mntent; | |
1615 | int ret = -1; | |
e76b8764 | 1616 | |
911324ef | 1617 | while ((mntent = getmntent(file))) { |
e76b8764 | 1618 | |
911324ef DL |
1619 | if (!rootfs->path) { |
1620 | if (mount_entry_on_systemfs(mntent)) | |
e76b8764 | 1621 | goto out; |
911324ef | 1622 | continue; |
e76b8764 CDC |
1623 | } |
1624 | ||
911324ef DL |
1625 | /* We have a separate root, mounts are relative to it */ |
1626 | if (mntent->mnt_dir[0] != '/') { | |
1627 | if (mount_entry_on_relative_rootfs(mntent, | |
1628 | rootfs->mount)) | |
1629 | goto out; | |
1630 | continue; | |
1631 | } | |
cd54d859 | 1632 | |
80a881b2 | 1633 | if (mount_entry_on_absolute_rootfs(mntent, rootfs, lxc_name)) |
911324ef | 1634 | goto out; |
0ad19a3f | 1635 | } |
cd54d859 | 1636 | |
0ad19a3f | 1637 | ret = 0; |
cd54d859 DL |
1638 | |
1639 | INFO("mount points have been setup"); | |
0ad19a3f | 1640 | out: |
e7938e9e MN |
1641 | return ret; |
1642 | } | |
1643 | ||
80a881b2 SH |
1644 | static int setup_mount(const struct lxc_rootfs *rootfs, const char *fstab, |
1645 | const char *lxc_name) | |
e7938e9e MN |
1646 | { |
1647 | FILE *file; | |
1648 | int ret; | |
1649 | ||
1650 | if (!fstab) | |
1651 | return 0; | |
1652 | ||
1653 | file = setmntent(fstab, "r"); | |
1654 | if (!file) { | |
1655 | SYSERROR("failed to use '%s'", fstab); | |
1656 | return -1; | |
1657 | } | |
1658 | ||
80a881b2 | 1659 | ret = mount_file_entries(rootfs, file, lxc_name); |
e7938e9e | 1660 | |
0ad19a3f | 1661 | endmntent(file); |
1662 | return ret; | |
1663 | } | |
1664 | ||
80a881b2 SH |
1665 | static int setup_mount_entries(const struct lxc_rootfs *rootfs, struct lxc_list *mount, |
1666 | const char *lxc_name) | |
e7938e9e MN |
1667 | { |
1668 | FILE *file; | |
1669 | struct lxc_list *iterator; | |
1670 | char *mount_entry; | |
1671 | int ret; | |
1672 | ||
1673 | file = tmpfile(); | |
1674 | if (!file) { | |
1675 | ERROR("tmpfile error: %m"); | |
1676 | return -1; | |
1677 | } | |
1678 | ||
1679 | lxc_list_for_each(iterator, mount) { | |
1680 | mount_entry = iterator->elem; | |
1d6b1976 | 1681 | fprintf(file, "%s\n", mount_entry); |
e7938e9e MN |
1682 | } |
1683 | ||
1684 | rewind(file); | |
1685 | ||
80a881b2 | 1686 | ret = mount_file_entries(rootfs, file, lxc_name); |
e7938e9e MN |
1687 | |
1688 | fclose(file); | |
1689 | return ret; | |
1690 | } | |
1691 | ||
81810dd1 DL |
1692 | static int setup_caps(struct lxc_list *caps) |
1693 | { | |
1694 | struct lxc_list *iterator; | |
1695 | char *drop_entry; | |
d55bc1ad | 1696 | char *ptr; |
81810dd1 DL |
1697 | int i, capid; |
1698 | ||
1699 | lxc_list_for_each(iterator, caps) { | |
1700 | ||
1701 | drop_entry = iterator->elem; | |
1702 | ||
1703 | capid = -1; | |
1704 | ||
1705 | for (i = 0; i < sizeof(caps_opt)/sizeof(caps_opt[0]); i++) { | |
1706 | ||
1707 | if (strcmp(drop_entry, caps_opt[i].name)) | |
1708 | continue; | |
1709 | ||
1710 | capid = caps_opt[i].value; | |
1711 | break; | |
1712 | } | |
1713 | ||
d55bc1ad CS |
1714 | if (capid < 0) { |
1715 | /* try to see if it's numeric, so the user may specify | |
1716 | * capabilities that the running kernel knows about but | |
1717 | * we don't */ | |
1718 | capid = strtol(drop_entry, &ptr, 10); | |
1719 | if (!ptr || *ptr != '\0' || | |
1720 | capid == LONG_MIN || capid == LONG_MAX) | |
1721 | /* not a valid number */ | |
1722 | capid = -1; | |
1723 | else if (capid > lxc_caps_last_cap()) | |
1724 | /* we have a number but it's not a valid | |
1725 | * capability */ | |
1726 | capid = -1; | |
1727 | } | |
1728 | ||
81810dd1 | 1729 | if (capid < 0) { |
1e11be34 DL |
1730 | ERROR("unknown capability %s", drop_entry); |
1731 | return -1; | |
81810dd1 DL |
1732 | } |
1733 | ||
1734 | DEBUG("drop capability '%s' (%d)", drop_entry, capid); | |
1735 | ||
1736 | if (prctl(PR_CAPBSET_DROP, capid, 0, 0, 0)) { | |
1737 | SYSERROR("failed to remove %s capability", drop_entry); | |
1738 | return -1; | |
1739 | } | |
1740 | ||
1741 | } | |
1742 | ||
1743 | DEBUG("capabilities has been setup"); | |
1744 | ||
1745 | return 0; | |
1746 | } | |
1747 | ||
0ad19a3f | 1748 | static int setup_hw_addr(char *hwaddr, const char *ifname) |
1749 | { | |
1750 | struct sockaddr sockaddr; | |
1751 | struct ifreq ifr; | |
1752 | int ret, fd; | |
1753 | ||
3cfc0f3a MN |
1754 | ret = lxc_convert_mac(hwaddr, &sockaddr); |
1755 | if (ret) { | |
1756 | ERROR("mac address '%s' conversion failed : %s", | |
1757 | hwaddr, strerror(-ret)); | |
0ad19a3f | 1758 | return -1; |
1759 | } | |
1760 | ||
1761 | memcpy(ifr.ifr_name, ifname, IFNAMSIZ); | |
1762 | memcpy((char *) &ifr.ifr_hwaddr, (char *) &sockaddr, sizeof(sockaddr)); | |
1763 | ||
1764 | fd = socket(AF_INET, SOCK_DGRAM, 0); | |
1765 | if (fd < 0) { | |
3ab87b66 | 1766 | ERROR("socket failure : %s", strerror(errno)); |
0ad19a3f | 1767 | return -1; |
1768 | } | |
1769 | ||
1770 | ret = ioctl(fd, SIOCSIFHWADDR, &ifr); | |
1771 | close(fd); | |
1772 | if (ret) | |
3ab87b66 | 1773 | ERROR("ioctl failure : %s", strerror(errno)); |
0ad19a3f | 1774 | |
cd54d859 DL |
1775 | DEBUG("mac address '%s' on '%s' has been setup", hwaddr, ifname); |
1776 | ||
0ad19a3f | 1777 | return ret; |
1778 | } | |
1779 | ||
82d5ae15 | 1780 | static int setup_ipv4_addr(struct lxc_list *ip, int ifindex) |
0ad19a3f | 1781 | { |
82d5ae15 DL |
1782 | struct lxc_list *iterator; |
1783 | struct lxc_inetdev *inetdev; | |
3cfc0f3a | 1784 | int err; |
0ad19a3f | 1785 | |
82d5ae15 DL |
1786 | lxc_list_for_each(iterator, ip) { |
1787 | ||
1788 | inetdev = iterator->elem; | |
1789 | ||
0093bb8c DL |
1790 | err = lxc_ipv4_addr_add(ifindex, &inetdev->addr, |
1791 | &inetdev->bcast, inetdev->prefix); | |
3cfc0f3a MN |
1792 | if (err) { |
1793 | ERROR("failed to setup_ipv4_addr ifindex %d : %s", | |
1794 | ifindex, strerror(-err)); | |
82d5ae15 DL |
1795 | return -1; |
1796 | } | |
1797 | } | |
1798 | ||
1799 | return 0; | |
0ad19a3f | 1800 | } |
1801 | ||
82d5ae15 | 1802 | static int setup_ipv6_addr(struct lxc_list *ip, int ifindex) |
0ad19a3f | 1803 | { |
82d5ae15 | 1804 | struct lxc_list *iterator; |
7fa9074f | 1805 | struct lxc_inet6dev *inet6dev; |
3cfc0f3a | 1806 | int err; |
0ad19a3f | 1807 | |
82d5ae15 DL |
1808 | lxc_list_for_each(iterator, ip) { |
1809 | ||
1810 | inet6dev = iterator->elem; | |
1811 | ||
b3df193c | 1812 | err = lxc_ipv6_addr_add(ifindex, &inet6dev->addr, |
0093bb8c DL |
1813 | &inet6dev->mcast, &inet6dev->acast, |
1814 | inet6dev->prefix); | |
3cfc0f3a MN |
1815 | if (err) { |
1816 | ERROR("failed to setup_ipv6_addr ifindex %d : %s", | |
1817 | ifindex, strerror(-err)); | |
82d5ae15 | 1818 | return -1; |
3cfc0f3a | 1819 | } |
82d5ae15 DL |
1820 | } |
1821 | ||
1822 | return 0; | |
0ad19a3f | 1823 | } |
1824 | ||
82d5ae15 | 1825 | static int setup_netdev(struct lxc_netdev *netdev) |
0ad19a3f | 1826 | { |
0ad19a3f | 1827 | char ifname[IFNAMSIZ]; |
0ad19a3f | 1828 | char *current_ifname = ifname; |
3cfc0f3a | 1829 | int err; |
0ad19a3f | 1830 | |
82d5ae15 DL |
1831 | /* empty network namespace */ |
1832 | if (!netdev->ifindex) { | |
b0efbac4 | 1833 | if (netdev->flags & IFF_UP) { |
d472214b | 1834 | err = lxc_netdev_up("lo"); |
3cfc0f3a MN |
1835 | if (err) { |
1836 | ERROR("failed to set the loopback up : %s", | |
1837 | strerror(-err)); | |
82d5ae15 DL |
1838 | return -1; |
1839 | } | |
82d5ae15 | 1840 | } |
7b57e8b6 | 1841 | return 0; |
0ad19a3f | 1842 | } |
13954cce | 1843 | |
82d5ae15 DL |
1844 | /* retrieve the name of the interface */ |
1845 | if (!if_indextoname(netdev->ifindex, current_ifname)) { | |
36eb9bde | 1846 | ERROR("no interface corresponding to index '%d'", |
82d5ae15 | 1847 | netdev->ifindex); |
0ad19a3f | 1848 | return -1; |
1849 | } | |
13954cce | 1850 | |
018ef520 | 1851 | /* default: let the system to choose one interface name */ |
9d083402 | 1852 | if (!netdev->name) |
fb6d9b2f DL |
1853 | netdev->name = netdev->type == LXC_NET_PHYS ? |
1854 | netdev->link : "eth%d"; | |
018ef520 | 1855 | |
82d5ae15 | 1856 | /* rename the interface name */ |
b84f58b9 | 1857 | err = lxc_netdev_rename_by_name(ifname, netdev->name); |
3cfc0f3a MN |
1858 | if (err) { |
1859 | ERROR("failed to rename %s->%s : %s", ifname, netdev->name, | |
1860 | strerror(-err)); | |
018ef520 DL |
1861 | return -1; |
1862 | } | |
1863 | ||
1864 | /* Re-read the name of the interface because its name has changed | |
1865 | * and would be automatically allocated by the system | |
1866 | */ | |
82d5ae15 | 1867 | if (!if_indextoname(netdev->ifindex, current_ifname)) { |
018ef520 | 1868 | ERROR("no interface corresponding to index '%d'", |
82d5ae15 | 1869 | netdev->ifindex); |
018ef520 | 1870 | return -1; |
0ad19a3f | 1871 | } |
1872 | ||
82d5ae15 DL |
1873 | /* set a mac address */ |
1874 | if (netdev->hwaddr) { | |
1875 | if (setup_hw_addr(netdev->hwaddr, current_ifname)) { | |
36eb9bde | 1876 | ERROR("failed to setup hw address for '%s'", |
82d5ae15 | 1877 | current_ifname); |
0ad19a3f | 1878 | return -1; |
1879 | } | |
1880 | } | |
1881 | ||
82d5ae15 DL |
1882 | /* setup ipv4 addresses on the interface */ |
1883 | if (setup_ipv4_addr(&netdev->ipv4, netdev->ifindex)) { | |
36eb9bde | 1884 | ERROR("failed to setup ip addresses for '%s'", |
0ad19a3f | 1885 | ifname); |
1886 | return -1; | |
1887 | } | |
1888 | ||
82d5ae15 DL |
1889 | /* setup ipv6 addresses on the interface */ |
1890 | if (setup_ipv6_addr(&netdev->ipv6, netdev->ifindex)) { | |
36eb9bde | 1891 | ERROR("failed to setup ipv6 addresses for '%s'", |
0ad19a3f | 1892 | ifname); |
1893 | return -1; | |
1894 | } | |
1895 | ||
82d5ae15 | 1896 | /* set the network device up */ |
b0efbac4 | 1897 | if (netdev->flags & IFF_UP) { |
3cfc0f3a MN |
1898 | int err; |
1899 | ||
d472214b | 1900 | err = lxc_netdev_up(current_ifname); |
3cfc0f3a MN |
1901 | if (err) { |
1902 | ERROR("failed to set '%s' up : %s", current_ifname, | |
1903 | strerror(-err)); | |
0ad19a3f | 1904 | return -1; |
1905 | } | |
1906 | ||
1907 | /* the network is up, make the loopback up too */ | |
d472214b | 1908 | err = lxc_netdev_up("lo"); |
3cfc0f3a MN |
1909 | if (err) { |
1910 | ERROR("failed to set the loopback up : %s", | |
1911 | strerror(-err)); | |
0ad19a3f | 1912 | return -1; |
1913 | } | |
1914 | } | |
1915 | ||
f8fee0e2 MK |
1916 | /* We can only set up the default routes after bringing |
1917 | * up the interface, sine bringing up the interface adds | |
1918 | * the link-local routes and we can't add a default | |
1919 | * route if the gateway is not reachable. */ | |
1920 | ||
1921 | /* setup ipv4 gateway on the interface */ | |
1922 | if (netdev->ipv4_gateway) { | |
1923 | if (!(netdev->flags & IFF_UP)) { | |
1924 | ERROR("Cannot add ipv4 gateway for %s when not bringing up the interface", ifname); | |
1925 | return -1; | |
1926 | } | |
1927 | ||
1928 | if (lxc_list_empty(&netdev->ipv4)) { | |
1929 | ERROR("Cannot add ipv4 gateway for %s when not assigning an address", ifname); | |
1930 | return -1; | |
1931 | } | |
1932 | ||
1933 | err = lxc_ipv4_gateway_add(netdev->ifindex, netdev->ipv4_gateway); | |
1934 | if (err) { | |
1935 | ERROR("failed to setup ipv4 gateway for '%s': %s", | |
1936 | ifname, strerror(-err)); | |
19a26f82 MK |
1937 | if (netdev->ipv4_gateway_auto) { |
1938 | char buf[INET_ADDRSTRLEN]; | |
1939 | inet_ntop(AF_INET, netdev->ipv4_gateway, buf, sizeof(buf)); | |
1940 | ERROR("tried to set autodetected ipv4 gateway '%s'", buf); | |
1941 | } | |
f8fee0e2 MK |
1942 | return -1; |
1943 | } | |
1944 | } | |
1945 | ||
1946 | /* setup ipv6 gateway on the interface */ | |
1947 | if (netdev->ipv6_gateway) { | |
1948 | if (!(netdev->flags & IFF_UP)) { | |
1949 | ERROR("Cannot add ipv6 gateway for %s when not bringing up the interface", ifname); | |
1950 | return -1; | |
1951 | } | |
1952 | ||
1953 | if (lxc_list_empty(&netdev->ipv6) && !IN6_IS_ADDR_LINKLOCAL(netdev->ipv6_gateway)) { | |
1954 | ERROR("Cannot add ipv6 gateway for %s when not assigning an address", ifname); | |
1955 | return -1; | |
1956 | } | |
1957 | ||
1958 | err = lxc_ipv6_gateway_add(netdev->ifindex, netdev->ipv6_gateway); | |
1959 | if (err) { | |
1960 | ERROR("failed to setup ipv6 gateway for '%s': %s", | |
1961 | ifname, strerror(-err)); | |
19a26f82 MK |
1962 | if (netdev->ipv6_gateway_auto) { |
1963 | char buf[INET6_ADDRSTRLEN]; | |
72d0e1cb | 1964 | inet_ntop(AF_INET6, netdev->ipv6_gateway, buf, sizeof(buf)); |
19a26f82 MK |
1965 | ERROR("tried to set autodetected ipv6 gateway '%s'", buf); |
1966 | } | |
f8fee0e2 MK |
1967 | return -1; |
1968 | } | |
1969 | } | |
1970 | ||
cd54d859 DL |
1971 | DEBUG("'%s' has been setup", current_ifname); |
1972 | ||
0ad19a3f | 1973 | return 0; |
1974 | } | |
1975 | ||
5f4535a3 | 1976 | static int setup_network(struct lxc_list *network) |
0ad19a3f | 1977 | { |
82d5ae15 | 1978 | struct lxc_list *iterator; |
82d5ae15 | 1979 | struct lxc_netdev *netdev; |
0ad19a3f | 1980 | |
5f4535a3 | 1981 | lxc_list_for_each(iterator, network) { |
cd54d859 | 1982 | |
5f4535a3 | 1983 | netdev = iterator->elem; |
82d5ae15 DL |
1984 | |
1985 | if (setup_netdev(netdev)) { | |
1986 | ERROR("failed to setup netdev"); | |
1987 | return -1; | |
1988 | } | |
1989 | } | |
cd54d859 | 1990 | |
5f4535a3 DL |
1991 | if (!lxc_list_empty(network)) |
1992 | INFO("network has been setup"); | |
cd54d859 DL |
1993 | |
1994 | return 0; | |
0ad19a3f | 1995 | } |
1996 | ||
7b35f3d6 SH |
1997 | void lxc_rename_phys_nics_on_shutdown(struct lxc_conf *conf) |
1998 | { | |
1999 | int i; | |
2000 | ||
2001 | INFO("running to reset %d nic names", conf->num_savednics); | |
2002 | for (i=0; i<conf->num_savednics; i++) { | |
2003 | struct saved_nic *s = &conf->saved_nics[i]; | |
2004 | INFO("resetting nic %d to %s\n", s->ifindex, s->orig_name); | |
2005 | lxc_netdev_rename_by_index(s->ifindex, s->orig_name); | |
2006 | free(s->orig_name); | |
2007 | } | |
2008 | conf->num_savednics = 0; | |
2009 | free(conf->saved_nics); | |
2010 | } | |
2011 | ||
49684c0b CS |
2012 | static int setup_private_host_hw_addr(char *veth1) |
2013 | { | |
2014 | struct ifreq ifr; | |
2015 | int err; | |
2016 | int sockfd; | |
2017 | ||
2018 | sockfd = socket(AF_INET, SOCK_DGRAM, 0); | |
2019 | if (sockfd < 0) | |
2020 | return -errno; | |
2021 | ||
2022 | snprintf((char *)ifr.ifr_name, IFNAMSIZ, "%s", veth1); | |
2023 | err = ioctl(sockfd, SIOCGIFHWADDR, &ifr); | |
2024 | if (err < 0) { | |
2025 | close(sockfd); | |
2026 | return -errno; | |
2027 | } | |
2028 | ||
2029 | ifr.ifr_hwaddr.sa_data[0] = 0xfe; | |
2030 | err = ioctl(sockfd, SIOCSIFHWADDR, &ifr); | |
2031 | close(sockfd); | |
2032 | if (err < 0) | |
2033 | return -errno; | |
2034 | ||
7ad84da7 DL |
2035 | DEBUG("mac address of host interface '%s' changed to private " |
2036 | "%02x:%02x:%02x:%02x:%02x:%02x", veth1, | |
2037 | ifr.ifr_hwaddr.sa_data[0] & 0xff, | |
2038 | ifr.ifr_hwaddr.sa_data[1] & 0xff, | |
2039 | ifr.ifr_hwaddr.sa_data[2] & 0xff, | |
2040 | ifr.ifr_hwaddr.sa_data[3] & 0xff, | |
2041 | ifr.ifr_hwaddr.sa_data[4] & 0xff, | |
2042 | ifr.ifr_hwaddr.sa_data[5] & 0xff); | |
49684c0b CS |
2043 | |
2044 | return 0; | |
2045 | } | |
2046 | ||
ae9242c8 SH |
2047 | static char *default_rootfs_mount = LXCROOTFSMOUNT; |
2048 | ||
7b379ab3 | 2049 | struct lxc_conf *lxc_conf_init(void) |
089cd8b8 | 2050 | { |
7b379ab3 | 2051 | struct lxc_conf *new; |
26ddeedd | 2052 | int i; |
7b379ab3 MN |
2053 | |
2054 | new = malloc(sizeof(*new)); | |
2055 | if (!new) { | |
2056 | ERROR("lxc_conf_init : %m"); | |
2057 | return NULL; | |
2058 | } | |
2059 | memset(new, 0, sizeof(*new)); | |
2060 | ||
cccc74b5 | 2061 | new->personality = -1; |
596a818d DE |
2062 | new->console.log_path = NULL; |
2063 | new->console.log_fd = -1; | |
28a4b0e5 | 2064 | new->console.path = NULL; |
63376d7d DL |
2065 | new->console.peer = -1; |
2066 | new->console.master = -1; | |
2067 | new->console.slave = -1; | |
2068 | new->console.name[0] = '\0'; | |
d2e30e99 | 2069 | new->maincmd_fd = -1; |
ae9242c8 | 2070 | new->rootfs.mount = default_rootfs_mount; |
7b379ab3 MN |
2071 | lxc_list_init(&new->cgroup); |
2072 | lxc_list_init(&new->network); | |
2073 | lxc_list_init(&new->mount_list); | |
81810dd1 | 2074 | lxc_list_init(&new->caps); |
f6d3e3e4 | 2075 | lxc_list_init(&new->id_map); |
26ddeedd SH |
2076 | for (i=0; i<NUM_LXC_HOOKS; i++) |
2077 | lxc_list_init(&new->hooks[i]); | |
e075f5d9 SH |
2078 | #if HAVE_APPARMOR |
2079 | new->aa_profile = NULL; | |
2080 | #endif | |
2081 | #if HAVE_APPARMOR /* || HAVE_SMACK || HAVE_SELINUX */ | |
2082 | new->lsm_umount_proc = 0; | |
2083 | #endif | |
7b379ab3 MN |
2084 | |
2085 | return new; | |
089cd8b8 DL |
2086 | } |
2087 | ||
e3b4c4c4 | 2088 | static int instanciate_veth(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2089 | { |
8634bc19 | 2090 | char veth1buf[IFNAMSIZ], *veth1; |
0e391e57 | 2091 | char veth2buf[IFNAMSIZ], *veth2; |
3cfc0f3a | 2092 | int err; |
13954cce | 2093 | |
e892973e DL |
2094 | if (netdev->priv.veth_attr.pair) |
2095 | veth1 = netdev->priv.veth_attr.pair; | |
8634bc19 | 2096 | else { |
9ba8130c SH |
2097 | err = snprintf(veth1buf, sizeof(veth1buf), "vethXXXXXX"); |
2098 | if (err >= sizeof(veth1buf)) { /* can't *really* happen, but... */ | |
2099 | ERROR("veth1 name too long"); | |
2100 | return -1; | |
2101 | } | |
0e391e57 | 2102 | veth1 = mktemp(veth1buf); |
74a2b586 JK |
2103 | /* store away for deconf */ |
2104 | memcpy(netdev->priv.veth_attr.veth1, veth1, IFNAMSIZ); | |
8634bc19 | 2105 | } |
82d5ae15 | 2106 | |
0e391e57 DL |
2107 | snprintf(veth2buf, sizeof(veth2buf), "vethXXXXXX"); |
2108 | veth2 = mktemp(veth2buf); | |
82d5ae15 DL |
2109 | |
2110 | if (!strlen(veth1) || !strlen(veth2)) { | |
2111 | ERROR("failed to allocate a temporary name"); | |
2112 | return -1; | |
0ad19a3f | 2113 | } |
2114 | ||
3cfc0f3a MN |
2115 | err = lxc_veth_create(veth1, veth2); |
2116 | if (err) { | |
2117 | ERROR("failed to create %s-%s : %s", veth1, veth2, | |
2118 | strerror(-err)); | |
6ab9ab6d | 2119 | return -1; |
0ad19a3f | 2120 | } |
13954cce | 2121 | |
49684c0b CS |
2122 | /* changing the high byte of the mac address to 0xfe, the bridge interface |
2123 | * will always keep the host's mac address and not take the mac address | |
2124 | * of a container */ | |
2125 | err = setup_private_host_hw_addr(veth1); | |
2126 | if (err) { | |
2127 | ERROR("failed to change mac address of host interface '%s' : %s", | |
2128 | veth1, strerror(-err)); | |
2129 | goto out_delete; | |
2130 | } | |
2131 | ||
82d5ae15 | 2132 | if (netdev->mtu) { |
d472214b | 2133 | err = lxc_netdev_set_mtu(veth1, atoi(netdev->mtu)); |
3cfc0f3a | 2134 | if (!err) |
d472214b | 2135 | err = lxc_netdev_set_mtu(veth2, atoi(netdev->mtu)); |
3cfc0f3a MN |
2136 | if (err) { |
2137 | ERROR("failed to set mtu '%s' for %s-%s : %s", | |
2138 | netdev->mtu, veth1, veth2, strerror(-err)); | |
eb14c10a | 2139 | goto out_delete; |
75d09f83 DL |
2140 | } |
2141 | } | |
2142 | ||
3cfc0f3a MN |
2143 | if (netdev->link) { |
2144 | err = lxc_bridge_attach(netdev->link, veth1); | |
2145 | if (err) { | |
2146 | ERROR("failed to attach '%s' to the bridge '%s' : %s", | |
2147 | veth1, netdev->link, strerror(-err)); | |
2148 | goto out_delete; | |
2149 | } | |
eb14c10a DL |
2150 | } |
2151 | ||
82d5ae15 DL |
2152 | netdev->ifindex = if_nametoindex(veth2); |
2153 | if (!netdev->ifindex) { | |
36eb9bde | 2154 | ERROR("failed to retrieve the index for %s", veth2); |
eb14c10a DL |
2155 | goto out_delete; |
2156 | } | |
2157 | ||
d472214b | 2158 | err = lxc_netdev_up(veth1); |
6e35af2e DL |
2159 | if (err) { |
2160 | ERROR("failed to set %s up : %s", veth1, strerror(-err)); | |
2161 | goto out_delete; | |
0ad19a3f | 2162 | } |
2163 | ||
e3b4c4c4 | 2164 | if (netdev->upscript) { |
751d9dcd DL |
2165 | err = run_script(handler->name, "net", netdev->upscript, "up", |
2166 | "veth", veth1, (char*) NULL); | |
2167 | if (err) | |
e3b4c4c4 | 2168 | goto out_delete; |
e3b4c4c4 ST |
2169 | } |
2170 | ||
82d5ae15 DL |
2171 | DEBUG("instanciated veth '%s/%s', index is '%d'", |
2172 | veth1, veth2, netdev->ifindex); | |
2173 | ||
6ab9ab6d | 2174 | return 0; |
eb14c10a DL |
2175 | |
2176 | out_delete: | |
b84f58b9 | 2177 | lxc_netdev_delete_by_name(veth1); |
6ab9ab6d | 2178 | return -1; |
13954cce | 2179 | } |
d957ae2d | 2180 | |
74a2b586 JK |
2181 | static int shutdown_veth(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2182 | { | |
2183 | char *veth1; | |
2184 | int err; | |
2185 | ||
2186 | if (netdev->priv.veth_attr.pair) | |
2187 | veth1 = netdev->priv.veth_attr.pair; | |
2188 | else | |
2189 | veth1 = netdev->priv.veth_attr.veth1; | |
2190 | ||
2191 | if (netdev->downscript) { | |
2192 | err = run_script(handler->name, "net", netdev->downscript, | |
2193 | "down", "veth", veth1, (char*) NULL); | |
2194 | if (err) | |
2195 | return -1; | |
2196 | } | |
2197 | return 0; | |
2198 | } | |
2199 | ||
e3b4c4c4 | 2200 | static int instanciate_macvlan(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2201 | { |
0e391e57 | 2202 | char peerbuf[IFNAMSIZ], *peer; |
3cfc0f3a | 2203 | int err; |
d957ae2d MT |
2204 | |
2205 | if (!netdev->link) { | |
2206 | ERROR("no link specified for macvlan netdev"); | |
2207 | return -1; | |
2208 | } | |
13954cce | 2209 | |
9ba8130c SH |
2210 | err = snprintf(peerbuf, sizeof(peerbuf), "mcXXXXXX"); |
2211 | if (err >= sizeof(peerbuf)) | |
2212 | return -1; | |
82d5ae15 | 2213 | |
0e391e57 | 2214 | peer = mktemp(peerbuf); |
82d5ae15 DL |
2215 | if (!strlen(peer)) { |
2216 | ERROR("failed to make a temporary name"); | |
2217 | return -1; | |
0ad19a3f | 2218 | } |
2219 | ||
3cfc0f3a MN |
2220 | err = lxc_macvlan_create(netdev->link, peer, |
2221 | netdev->priv.macvlan_attr.mode); | |
2222 | if (err) { | |
2223 | ERROR("failed to create macvlan interface '%s' on '%s' : %s", | |
2224 | peer, netdev->link, strerror(-err)); | |
d957ae2d | 2225 | return -1; |
0ad19a3f | 2226 | } |
2227 | ||
82d5ae15 DL |
2228 | netdev->ifindex = if_nametoindex(peer); |
2229 | if (!netdev->ifindex) { | |
36eb9bde | 2230 | ERROR("failed to retrieve the index for %s", peer); |
b84f58b9 | 2231 | lxc_netdev_delete_by_name(peer); |
d957ae2d | 2232 | return -1; |
22ebac19 | 2233 | } |
2234 | ||
e3b4c4c4 | 2235 | if (netdev->upscript) { |
751d9dcd DL |
2236 | err = run_script(handler->name, "net", netdev->upscript, "up", |
2237 | "macvlan", netdev->link, (char*) NULL); | |
2238 | if (err) | |
e3b4c4c4 | 2239 | return -1; |
e3b4c4c4 ST |
2240 | } |
2241 | ||
e892973e DL |
2242 | DEBUG("instanciated macvlan '%s', index is '%d' and mode '%d'", |
2243 | peer, netdev->ifindex, netdev->priv.macvlan_attr.mode); | |
0ad19a3f | 2244 | |
d957ae2d | 2245 | return 0; |
0ad19a3f | 2246 | } |
2247 | ||
74a2b586 JK |
2248 | static int shutdown_macvlan(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2249 | { | |
2250 | int err; | |
2251 | ||
2252 | if (netdev->downscript) { | |
2253 | err = run_script(handler->name, "net", netdev->downscript, | |
2254 | "down", "macvlan", netdev->link, | |
2255 | (char*) NULL); | |
2256 | if (err) | |
2257 | return -1; | |
2258 | } | |
2259 | return 0; | |
2260 | } | |
2261 | ||
26c39028 | 2262 | /* XXX: merge with instanciate_macvlan */ |
e3b4c4c4 | 2263 | static int instanciate_vlan(struct lxc_handler *handler, struct lxc_netdev *netdev) |
26c39028 JHS |
2264 | { |
2265 | char peer[IFNAMSIZ]; | |
3cfc0f3a | 2266 | int err; |
26c39028 JHS |
2267 | |
2268 | if (!netdev->link) { | |
2269 | ERROR("no link specified for vlan netdev"); | |
2270 | return -1; | |
2271 | } | |
2272 | ||
9ba8130c SH |
2273 | err = snprintf(peer, sizeof(peer), "vlan%d", netdev->priv.vlan_attr.vid); |
2274 | if (err >= sizeof(peer)) { | |
2275 | ERROR("peer name too long"); | |
2276 | return -1; | |
2277 | } | |
26c39028 | 2278 | |
3cfc0f3a MN |
2279 | err = lxc_vlan_create(netdev->link, peer, netdev->priv.vlan_attr.vid); |
2280 | if (err) { | |
2281 | ERROR("failed to create vlan interface '%s' on '%s' : %s", | |
2282 | peer, netdev->link, strerror(-err)); | |
26c39028 JHS |
2283 | return -1; |
2284 | } | |
2285 | ||
2286 | netdev->ifindex = if_nametoindex(peer); | |
2287 | if (!netdev->ifindex) { | |
2288 | ERROR("failed to retrieve the ifindex for %s", peer); | |
b84f58b9 | 2289 | lxc_netdev_delete_by_name(peer); |
26c39028 JHS |
2290 | return -1; |
2291 | } | |
2292 | ||
e892973e DL |
2293 | DEBUG("instanciated vlan '%s', ifindex is '%d'", " vlan1000", |
2294 | netdev->ifindex); | |
2295 | ||
26c39028 JHS |
2296 | return 0; |
2297 | } | |
2298 | ||
74a2b586 JK |
2299 | static int shutdown_vlan(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2300 | { | |
2301 | return 0; | |
2302 | } | |
2303 | ||
e3b4c4c4 | 2304 | static int instanciate_phys(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2305 | { |
6168e99f DL |
2306 | if (!netdev->link) { |
2307 | ERROR("no link specified for the physical interface"); | |
2308 | return -1; | |
2309 | } | |
2310 | ||
9d083402 | 2311 | netdev->ifindex = if_nametoindex(netdev->link); |
82d5ae15 | 2312 | if (!netdev->ifindex) { |
9d083402 | 2313 | ERROR("failed to retrieve the index for %s", netdev->link); |
0ad19a3f | 2314 | return -1; |
2315 | } | |
2316 | ||
e3b4c4c4 ST |
2317 | if (netdev->upscript) { |
2318 | int err; | |
751d9dcd DL |
2319 | err = run_script(handler->name, "net", netdev->upscript, |
2320 | "up", "phys", netdev->link, (char*) NULL); | |
2321 | if (err) | |
e3b4c4c4 | 2322 | return -1; |
e3b4c4c4 ST |
2323 | } |
2324 | ||
82d5ae15 | 2325 | return 0; |
0ad19a3f | 2326 | } |
2327 | ||
74a2b586 JK |
2328 | static int shutdown_phys(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2329 | { | |
2330 | int err; | |
2331 | ||
2332 | if (netdev->downscript) { | |
2333 | err = run_script(handler->name, "net", netdev->downscript, | |
2334 | "down", "phys", netdev->link, (char*) NULL); | |
2335 | if (err) | |
2336 | return -1; | |
2337 | } | |
2338 | return 0; | |
2339 | } | |
2340 | ||
e3b4c4c4 | 2341 | static int instanciate_empty(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2342 | { |
82d5ae15 | 2343 | netdev->ifindex = 0; |
e3b4c4c4 ST |
2344 | if (netdev->upscript) { |
2345 | int err; | |
751d9dcd DL |
2346 | err = run_script(handler->name, "net", netdev->upscript, |
2347 | "up", "empty", (char*) NULL); | |
2348 | if (err) | |
e3b4c4c4 | 2349 | return -1; |
e3b4c4c4 | 2350 | } |
82d5ae15 | 2351 | return 0; |
0ad19a3f | 2352 | } |
2353 | ||
74a2b586 JK |
2354 | static int shutdown_empty(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2355 | { | |
2356 | int err; | |
2357 | ||
2358 | if (netdev->downscript) { | |
2359 | err = run_script(handler->name, "net", netdev->downscript, | |
2360 | "down", "empty", (char*) NULL); | |
2361 | if (err) | |
2362 | return -1; | |
2363 | } | |
2364 | return 0; | |
2365 | } | |
2366 | ||
e3b4c4c4 | 2367 | int lxc_create_network(struct lxc_handler *handler) |
0ad19a3f | 2368 | { |
e3b4c4c4 | 2369 | struct lxc_list *network = &handler->conf->network; |
82d5ae15 | 2370 | struct lxc_list *iterator; |
82d5ae15 | 2371 | struct lxc_netdev *netdev; |
0ad19a3f | 2372 | |
5f4535a3 | 2373 | lxc_list_for_each(iterator, network) { |
0ad19a3f | 2374 | |
5f4535a3 | 2375 | netdev = iterator->elem; |
13954cce | 2376 | |
24654103 | 2377 | if (netdev->type < 0 || netdev->type > LXC_NET_MAXCONFTYPE) { |
82d5ae15 | 2378 | ERROR("invalid network configuration type '%d'", |
5f4535a3 | 2379 | netdev->type); |
82d5ae15 DL |
2380 | return -1; |
2381 | } | |
0ad19a3f | 2382 | |
e3b4c4c4 | 2383 | if (netdev_conf[netdev->type](handler, netdev)) { |
82d5ae15 DL |
2384 | ERROR("failed to create netdev"); |
2385 | return -1; | |
2386 | } | |
e3b4c4c4 | 2387 | |
0ad19a3f | 2388 | } |
2389 | ||
2390 | return 0; | |
2391 | } | |
2392 | ||
74a2b586 | 2393 | void lxc_delete_network(struct lxc_handler *handler) |
7fef7a06 | 2394 | { |
74a2b586 | 2395 | struct lxc_list *network = &handler->conf->network; |
7fef7a06 DL |
2396 | struct lxc_list *iterator; |
2397 | struct lxc_netdev *netdev; | |
2398 | ||
2399 | lxc_list_for_each(iterator, network) { | |
2400 | netdev = iterator->elem; | |
d472214b | 2401 | |
74a2b586 | 2402 | if (netdev->ifindex != 0 && netdev->type == LXC_NET_PHYS) { |
d8f8e352 DL |
2403 | if (lxc_netdev_rename_by_index(netdev->ifindex, netdev->link)) |
2404 | WARN("failed to rename to the initial name the " \ | |
2405 | "netdev '%s'", netdev->link); | |
d472214b | 2406 | continue; |
d8f8e352 | 2407 | } |
d472214b | 2408 | |
74a2b586 JK |
2409 | if (netdev_deconf[netdev->type](handler, netdev)) { |
2410 | WARN("failed to destroy netdev"); | |
2411 | } | |
2412 | ||
d8f8e352 DL |
2413 | /* Recent kernel remove the virtual interfaces when the network |
2414 | * namespace is destroyed but in case we did not moved the | |
2415 | * interface to the network namespace, we have to destroy it | |
2416 | */ | |
74a2b586 JK |
2417 | if (netdev->ifindex != 0 && |
2418 | lxc_netdev_delete_by_index(netdev->ifindex)) | |
d8f8e352 | 2419 | WARN("failed to remove interface '%s'", netdev->name); |
7fef7a06 DL |
2420 | } |
2421 | } | |
2422 | ||
5f4535a3 | 2423 | int lxc_assign_network(struct lxc_list *network, pid_t pid) |
0ad19a3f | 2424 | { |
82d5ae15 | 2425 | struct lxc_list *iterator; |
82d5ae15 | 2426 | struct lxc_netdev *netdev; |
3cfc0f3a | 2427 | int err; |
0ad19a3f | 2428 | |
5f4535a3 | 2429 | lxc_list_for_each(iterator, network) { |
82d5ae15 | 2430 | |
5f4535a3 | 2431 | netdev = iterator->elem; |
82d5ae15 | 2432 | |
236087a6 DL |
2433 | /* empty network namespace, nothing to move */ |
2434 | if (!netdev->ifindex) | |
2435 | continue; | |
2436 | ||
d472214b | 2437 | err = lxc_netdev_move_by_index(netdev->ifindex, pid); |
3cfc0f3a MN |
2438 | if (err) { |
2439 | ERROR("failed to move '%s' to the container : %s", | |
2440 | netdev->link, strerror(-err)); | |
82d5ae15 DL |
2441 | return -1; |
2442 | } | |
2443 | ||
c1c75c04 | 2444 | DEBUG("move '%s' to '%d'", netdev->name, pid); |
0ad19a3f | 2445 | } |
2446 | ||
2447 | return 0; | |
2448 | } | |
2449 | ||
f6d3e3e4 SH |
2450 | int add_id_mapping(enum idtype idtype, pid_t pid, uid_t host_start, uid_t ns_start, int range) |
2451 | { | |
2452 | char path[PATH_MAX]; | |
e4ccd113 | 2453 | int ret, closeret; |
f6d3e3e4 SH |
2454 | FILE *f; |
2455 | ||
2456 | ret = snprintf(path, PATH_MAX, "/proc/%d/%cid_map", pid, idtype == ID_TYPE_UID ? 'u' : 'g'); | |
2457 | if (ret < 0 || ret >= PATH_MAX) { | |
2458 | fprintf(stderr, "%s: path name too long", __func__); | |
2459 | return -E2BIG; | |
2460 | } | |
2461 | f = fopen(path, "w"); | |
2462 | if (!f) { | |
2463 | perror("open"); | |
2464 | return -EINVAL; | |
2465 | } | |
2466 | ret = fprintf(f, "%d %d %d", ns_start, host_start, range); | |
2467 | if (ret < 0) | |
e4ccd113 SH |
2468 | SYSERROR("writing id mapping"); |
2469 | closeret = fclose(f); | |
2470 | if (closeret) | |
2471 | SYSERROR("writing id mapping"); | |
2472 | return ret < 0 ? ret : closeret; | |
f6d3e3e4 SH |
2473 | } |
2474 | ||
2475 | int lxc_map_ids(struct lxc_list *idmap, pid_t pid) | |
2476 | { | |
2477 | struct lxc_list *iterator; | |
2478 | struct id_map *map; | |
2479 | int ret = 0; | |
2480 | ||
2481 | lxc_list_for_each(iterator, idmap) { | |
2482 | map = iterator->elem; | |
2483 | ret = add_id_mapping(map->idtype, pid, map->hostid, map->nsid, map->range); | |
2484 | if (ret) | |
2485 | break; | |
2486 | } | |
2487 | return ret; | |
2488 | } | |
2489 | ||
19a26f82 MK |
2490 | int lxc_find_gateway_addresses(struct lxc_handler *handler) |
2491 | { | |
2492 | struct lxc_list *network = &handler->conf->network; | |
2493 | struct lxc_list *iterator; | |
2494 | struct lxc_netdev *netdev; | |
2495 | int link_index; | |
2496 | ||
2497 | lxc_list_for_each(iterator, network) { | |
2498 | netdev = iterator->elem; | |
2499 | ||
2500 | if (!netdev->ipv4_gateway_auto && !netdev->ipv6_gateway_auto) | |
2501 | continue; | |
2502 | ||
2503 | if (netdev->type != LXC_NET_VETH && netdev->type != LXC_NET_MACVLAN) { | |
2504 | ERROR("gateway = auto only supported for " | |
2505 | "veth and macvlan"); | |
2506 | return -1; | |
2507 | } | |
2508 | ||
2509 | if (!netdev->link) { | |
2510 | ERROR("gateway = auto needs a link interface"); | |
2511 | return -1; | |
2512 | } | |
2513 | ||
2514 | link_index = if_nametoindex(netdev->link); | |
2515 | if (!link_index) | |
2516 | return -EINVAL; | |
2517 | ||
2518 | if (netdev->ipv4_gateway_auto) { | |
2519 | if (lxc_ipv4_addr_get(link_index, &netdev->ipv4_gateway)) { | |
2520 | ERROR("failed to automatically find ipv4 gateway " | |
2521 | "address from link interface '%s'", netdev->link); | |
2522 | return -1; | |
2523 | } | |
2524 | } | |
2525 | ||
2526 | if (netdev->ipv6_gateway_auto) { | |
2527 | if (lxc_ipv6_addr_get(link_index, &netdev->ipv6_gateway)) { | |
2528 | ERROR("failed to automatically find ipv6 gateway " | |
2529 | "address from link interface '%s'", netdev->link); | |
2530 | return -1; | |
2531 | } | |
2532 | } | |
2533 | } | |
2534 | ||
2535 | return 0; | |
2536 | } | |
2537 | ||
5e4a62bf | 2538 | int lxc_create_tty(const char *name, struct lxc_conf *conf) |
b0a33c1e | 2539 | { |
5e4a62bf | 2540 | struct lxc_tty_info *tty_info = &conf->tty_info; |
985d15b1 | 2541 | int i; |
b0a33c1e | 2542 | |
5e4a62bf DL |
2543 | /* no tty in the configuration */ |
2544 | if (!conf->tty) | |
b0a33c1e | 2545 | return 0; |
2546 | ||
13954cce | 2547 | tty_info->pty_info = |
e4e7d59d | 2548 | malloc(sizeof(*tty_info->pty_info)*conf->tty); |
b0a33c1e | 2549 | if (!tty_info->pty_info) { |
36eb9bde | 2550 | SYSERROR("failed to allocate pty_info"); |
985d15b1 | 2551 | return -1; |
b0a33c1e | 2552 | } |
2553 | ||
985d15b1 | 2554 | for (i = 0; i < conf->tty; i++) { |
13954cce | 2555 | |
b0a33c1e | 2556 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; |
2557 | ||
13954cce | 2558 | if (openpty(&pty_info->master, &pty_info->slave, |
b0a33c1e | 2559 | pty_info->name, NULL, NULL)) { |
36eb9bde | 2560 | SYSERROR("failed to create pty #%d", i); |
985d15b1 MT |
2561 | tty_info->nbtty = i; |
2562 | lxc_delete_tty(tty_info); | |
2563 | return -1; | |
b0a33c1e | 2564 | } |
2565 | ||
5332bb84 DL |
2566 | DEBUG("allocated pty '%s' (%d/%d)", |
2567 | pty_info->name, pty_info->master, pty_info->slave); | |
2568 | ||
b035ad62 MS |
2569 | /* Prevent leaking the file descriptors to the container */ |
2570 | fcntl(pty_info->master, F_SETFD, FD_CLOEXEC); | |
2571 | fcntl(pty_info->slave, F_SETFD, FD_CLOEXEC); | |
2572 | ||
b0a33c1e | 2573 | pty_info->busy = 0; |
2574 | } | |
2575 | ||
985d15b1 | 2576 | tty_info->nbtty = conf->tty; |
1ac470c0 DL |
2577 | |
2578 | INFO("tty's configured"); | |
2579 | ||
985d15b1 | 2580 | return 0; |
b0a33c1e | 2581 | } |
2582 | ||
2583 | void lxc_delete_tty(struct lxc_tty_info *tty_info) | |
2584 | { | |
2585 | int i; | |
2586 | ||
2587 | for (i = 0; i < tty_info->nbtty; i++) { | |
2588 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; | |
2589 | ||
2590 | close(pty_info->master); | |
2591 | close(pty_info->slave); | |
2592 | } | |
2593 | ||
2594 | free(tty_info->pty_info); | |
2595 | tty_info->nbtty = 0; | |
2596 | } | |
2597 | ||
f6d3e3e4 SH |
2598 | /* |
2599 | * given a host uid, return the ns uid if it is mapped. | |
2600 | * if it is not mapped, return the original host id. | |
2601 | */ | |
2602 | static int shiftid(struct lxc_conf *c, int uid, enum idtype w) | |
2603 | { | |
2604 | struct lxc_list *iterator; | |
2605 | struct id_map *map; | |
2606 | int low, high; | |
2607 | ||
2608 | lxc_list_for_each(iterator, &c->id_map) { | |
2609 | map = iterator->elem; | |
2610 | if (map->idtype != w) | |
2611 | continue; | |
2612 | ||
2613 | low = map->nsid; | |
2614 | high = map->nsid + map->range; | |
2615 | if (uid < low || uid >= high) | |
2616 | continue; | |
2617 | ||
2618 | return uid - low + map->hostid; | |
2619 | } | |
2620 | ||
2621 | return uid; | |
2622 | } | |
2623 | ||
2624 | /* | |
2625 | * Take a pathname for a file created on the host, and map the uid and gid | |
2626 | * into the container if needed. (Used for ttys) | |
2627 | */ | |
2628 | static int uid_shift_file(char *path, struct lxc_conf *c) | |
2629 | { | |
2630 | struct stat statbuf; | |
2631 | int newuid, newgid; | |
2632 | ||
2633 | if (stat(path, &statbuf)) { | |
2634 | SYSERROR("stat(%s)", path); | |
2635 | return -1; | |
2636 | } | |
2637 | ||
2638 | newuid = shiftid(c, statbuf.st_uid, ID_TYPE_UID); | |
2639 | newgid = shiftid(c, statbuf.st_gid, ID_TYPE_GID); | |
2640 | if (newuid != statbuf.st_uid || newgid != statbuf.st_gid) { | |
20087962 | 2641 | DEBUG("chowning %s from %d:%d to %d:%d\n", path, (int)statbuf.st_uid, (int)statbuf.st_gid, newuid, newgid); |
f6d3e3e4 SH |
2642 | if (chown(path, newuid, newgid)) { |
2643 | SYSERROR("chown(%s)", path); | |
2644 | return -1; | |
2645 | } | |
2646 | } | |
2647 | return 0; | |
2648 | } | |
2649 | ||
2650 | int uid_shift_ttys(int pid, struct lxc_conf *conf) | |
2651 | { | |
2652 | int i, ret; | |
2653 | struct lxc_tty_info *tty_info = &conf->tty_info; | |
2654 | char path[MAXPATHLEN]; | |
2655 | char *ttydir = conf->ttydir; | |
2656 | ||
2657 | if (!conf->rootfs.path) | |
2658 | return 0; | |
2659 | /* first the console */ | |
2660 | ret = snprintf(path, sizeof(path), "/proc/%d/root/dev/%s/console", pid, ttydir ? ttydir : ""); | |
2661 | if (ret < 0 || ret >= sizeof(path)) { | |
2662 | ERROR("console path too long\n"); | |
2663 | return -1; | |
2664 | } | |
2665 | if (uid_shift_file(path, conf)) { | |
2666 | DEBUG("Failed to chown the console %s.\n", path); | |
2667 | return -1; | |
2668 | } | |
2669 | for (i=0; i< tty_info->nbtty; i++) { | |
2670 | ret = snprintf(path, sizeof(path), "/proc/%d/root/dev/%s/tty%d", | |
2671 | pid, ttydir ? ttydir : "", i + 1); | |
2672 | if (ret < 0 || ret >= sizeof(path)) { | |
2673 | ERROR("pathname too long for ttys"); | |
2674 | return -1; | |
2675 | } | |
2676 | if (uid_shift_file(path, conf)) { | |
2677 | DEBUG("Failed to chown pty %s.\n", path); | |
2678 | return -1; | |
2679 | } | |
2680 | } | |
2681 | ||
2682 | return 0; | |
2683 | } | |
2684 | ||
571e6ec8 | 2685 | int lxc_setup(const char *name, struct lxc_conf *lxc_conf) |
0ad19a3f | 2686 | { |
e075f5d9 SH |
2687 | #if HAVE_APPARMOR /* || HAVE_SMACK || HAVE_SELINUX */ |
2688 | int mounted; | |
2689 | #endif | |
2690 | ||
571e6ec8 | 2691 | if (setup_utsname(lxc_conf->utsname)) { |
36eb9bde | 2692 | ERROR("failed to setup the utsname for '%s'", name); |
95b5ffaf | 2693 | return -1; |
0ad19a3f | 2694 | } |
2695 | ||
5f4535a3 | 2696 | if (setup_network(&lxc_conf->network)) { |
36eb9bde | 2697 | ERROR("failed to setup the network for '%s'", name); |
95b5ffaf | 2698 | return -1; |
0ad19a3f | 2699 | } |
2700 | ||
89eaa05e SH |
2701 | if (run_lxc_hooks(name, "pre-mount", lxc_conf)) { |
2702 | ERROR("failed to run pre-mount hooks for container '%s'.", name); | |
2703 | return -1; | |
2704 | } | |
5ea6163a | 2705 | |
cc28d0b0 | 2706 | if (setup_rootfs(lxc_conf)) { |
ac778708 | 2707 | ERROR("failed to setup rootfs for '%s'", name); |
95b5ffaf | 2708 | return -1; |
0ad19a3f | 2709 | } |
2710 | ||
c6883f38 | 2711 | if (lxc_conf->autodev) { |
91c3830e SH |
2712 | if (mount_autodev(lxc_conf->rootfs.mount)) { |
2713 | ERROR("failed to mount /dev in the container"); | |
c6883f38 SH |
2714 | return -1; |
2715 | } | |
2716 | } | |
2717 | ||
80a881b2 | 2718 | if (setup_mount(&lxc_conf->rootfs, lxc_conf->fstab, name)) { |
36eb9bde | 2719 | ERROR("failed to setup the mounts for '%s'", name); |
95b5ffaf | 2720 | return -1; |
576f946d | 2721 | } |
2722 | ||
c1dc38c2 | 2723 | if (!lxc_list_empty(&lxc_conf->mount_list) && setup_mount_entries(&lxc_conf->rootfs, &lxc_conf->mount_list, name)) { |
e7938e9e MN |
2724 | ERROR("failed to setup the mount entries for '%s'", name); |
2725 | return -1; | |
2726 | } | |
2727 | ||
773fb9ca SH |
2728 | if (run_lxc_hooks(name, "mount", lxc_conf)) { |
2729 | ERROR("failed to run mount hooks for container '%s'.", name); | |
2730 | return -1; | |
2731 | } | |
2732 | ||
91c3830e | 2733 | if (lxc_conf->autodev) { |
f7bee6c6 MW |
2734 | if (run_lxc_hooks(name, "autodev", lxc_conf)) { |
2735 | ERROR("failed to run autodev hooks for container '%s'.", name); | |
2736 | return -1; | |
2737 | } | |
91c3830e SH |
2738 | if (setup_autodev(lxc_conf->rootfs.mount)) { |
2739 | ERROR("failed to populate /dev in the container"); | |
2740 | return -1; | |
2741 | } | |
2742 | } | |
2743 | ||
7c6ef2a2 | 2744 | if (setup_console(&lxc_conf->rootfs, &lxc_conf->console, lxc_conf->ttydir)) { |
36eb9bde | 2745 | ERROR("failed to setup the console for '%s'", name); |
95b5ffaf | 2746 | return -1; |
6e590161 | 2747 | } |
2748 | ||
f62b3449 | 2749 | if (setup_kmsg(&lxc_conf->rootfs, &lxc_conf->console)) // don't fail |
1bd051a6 | 2750 | ERROR("failed to setup kmsg for '%s'", name); |
1bd051a6 | 2751 | |
7c6ef2a2 | 2752 | if (setup_tty(&lxc_conf->rootfs, &lxc_conf->tty_info, lxc_conf->ttydir)) { |
36eb9bde | 2753 | ERROR("failed to setup the ttys for '%s'", name); |
95b5ffaf | 2754 | return -1; |
b0a33c1e | 2755 | } |
2756 | ||
e075f5d9 | 2757 | #if HAVE_APPARMOR /* || HAVE_SMACK || HAVE_SELINUX */ |
9ac3ffb5 SG |
2758 | INFO("rootfs path is .%s., mount is .%s.", lxc_conf->rootfs.path, |
2759 | lxc_conf->rootfs.mount); | |
2760 | if (lxc_conf->rootfs.path == NULL || strlen(lxc_conf->rootfs.path) == 0) | |
2761 | mounted = 0; | |
2762 | else | |
2763 | mounted = lsm_mount_proc_if_needed(lxc_conf->rootfs.path, lxc_conf->rootfs.mount); | |
e075f5d9 SH |
2764 | if (mounted == -1) { |
2765 | SYSERROR("failed to mount /proc in the container."); | |
2766 | return -1; | |
2767 | } else if (mounted == 1) { | |
2768 | lxc_conf->lsm_umount_proc = 1; | |
2769 | } | |
2770 | #endif | |
2771 | ||
ac778708 | 2772 | if (setup_pivot_root(&lxc_conf->rootfs)) { |
36eb9bde | 2773 | ERROR("failed to set rootfs for '%s'", name); |
95b5ffaf | 2774 | return -1; |
ed502555 | 2775 | } |
2776 | ||
571e6ec8 | 2777 | if (setup_pts(lxc_conf->pts)) { |
36eb9bde | 2778 | ERROR("failed to setup the new pts instance"); |
95b5ffaf | 2779 | return -1; |
3c26f34e | 2780 | } |
2781 | ||
cccc74b5 DL |
2782 | if (setup_personality(lxc_conf->personality)) { |
2783 | ERROR("failed to setup personality"); | |
2784 | return -1; | |
2785 | } | |
2786 | ||
f6d3e3e4 SH |
2787 | if (lxc_list_empty(&lxc_conf->id_map)) { |
2788 | if (setup_caps(&lxc_conf->caps)) { | |
2789 | ERROR("failed to drop capabilities"); | |
2790 | return -1; | |
2791 | } | |
81810dd1 DL |
2792 | } |
2793 | ||
cd54d859 DL |
2794 | NOTICE("'%s' is setup.", name); |
2795 | ||
0ad19a3f | 2796 | return 0; |
2797 | } | |
26ddeedd SH |
2798 | |
2799 | int run_lxc_hooks(const char *name, char *hook, struct lxc_conf *conf) | |
2800 | { | |
2801 | int which = -1; | |
2802 | struct lxc_list *it; | |
2803 | ||
2804 | if (strcmp(hook, "pre-start") == 0) | |
2805 | which = LXCHOOK_PRESTART; | |
5ea6163a SH |
2806 | else if (strcmp(hook, "pre-mount") == 0) |
2807 | which = LXCHOOK_PREMOUNT; | |
26ddeedd SH |
2808 | else if (strcmp(hook, "mount") == 0) |
2809 | which = LXCHOOK_MOUNT; | |
f7bee6c6 MW |
2810 | else if (strcmp(hook, "autodev") == 0) |
2811 | which = LXCHOOK_AUTODEV; | |
26ddeedd SH |
2812 | else if (strcmp(hook, "start") == 0) |
2813 | which = LXCHOOK_START; | |
2814 | else if (strcmp(hook, "post-stop") == 0) | |
2815 | which = LXCHOOK_POSTSTOP; | |
2816 | else | |
2817 | return -1; | |
2818 | lxc_list_for_each(it, &conf->hooks[which]) { | |
2819 | int ret; | |
2820 | char *hookname = it->elem; | |
2821 | ret = run_script(name, "lxc", hookname, hook, NULL); | |
2822 | if (ret) | |
2823 | return ret; | |
2824 | } | |
2825 | return 0; | |
2826 | } | |
72d0e1cb | 2827 | |
427b3a21 | 2828 | static void lxc_remove_nic(struct lxc_list *it) |
72d0e1cb SG |
2829 | { |
2830 | struct lxc_netdev *netdev = it->elem; | |
9ebb03ad | 2831 | struct lxc_list *it2,*next; |
72d0e1cb SG |
2832 | |
2833 | lxc_list_del(it); | |
2834 | ||
2835 | if (netdev->link) | |
2836 | free(netdev->link); | |
2837 | if (netdev->name) | |
2838 | free(netdev->name); | |
2839 | if (netdev->upscript) | |
2840 | free(netdev->upscript); | |
2841 | if (netdev->hwaddr) | |
2842 | free(netdev->hwaddr); | |
2843 | if (netdev->mtu) | |
2844 | free(netdev->mtu); | |
2845 | if (netdev->ipv4_gateway) | |
2846 | free(netdev->ipv4_gateway); | |
2847 | if (netdev->ipv6_gateway) | |
2848 | free(netdev->ipv6_gateway); | |
9ebb03ad | 2849 | lxc_list_for_each_safe(it2, &netdev->ipv4, next) { |
72d0e1cb SG |
2850 | lxc_list_del(it2); |
2851 | free(it2->elem); | |
2852 | free(it2); | |
2853 | } | |
9ebb03ad | 2854 | lxc_list_for_each_safe(it2, &netdev->ipv6, next) { |
72d0e1cb SG |
2855 | lxc_list_del(it2); |
2856 | free(it2->elem); | |
2857 | free(it2); | |
2858 | } | |
d95db067 | 2859 | free(netdev); |
72d0e1cb SG |
2860 | free(it); |
2861 | } | |
2862 | ||
2863 | /* we get passed in something like '0', '0.ipv4' or '1.ipv6' */ | |
12a50cc6 | 2864 | int lxc_clear_nic(struct lxc_conf *c, const char *key) |
72d0e1cb SG |
2865 | { |
2866 | char *p1; | |
2867 | int ret, idx, i; | |
2868 | struct lxc_list *it; | |
2869 | struct lxc_netdev *netdev; | |
2870 | ||
2871 | p1 = index(key, '.'); | |
2872 | if (!p1 || *(p1+1) == '\0') | |
2873 | p1 = NULL; | |
2874 | ||
2875 | ret = sscanf(key, "%d", &idx); | |
2876 | if (ret != 1) return -1; | |
2877 | if (idx < 0) | |
2878 | return -1; | |
2879 | ||
2880 | i = 0; | |
2881 | lxc_list_for_each(it, &c->network) { | |
2882 | if (i == idx) | |
2883 | break; | |
2884 | i++; | |
2885 | } | |
2886 | if (i < idx) // we don't have that many nics defined | |
2887 | return -1; | |
2888 | ||
2889 | if (!it || !it->elem) | |
2890 | return -1; | |
2891 | ||
2892 | netdev = it->elem; | |
2893 | ||
2894 | if (!p1) { | |
2895 | lxc_remove_nic(it); | |
2896 | } else if (strcmp(p1, "ipv4") == 0) { | |
9ebb03ad DE |
2897 | struct lxc_list *it2,*next; |
2898 | lxc_list_for_each_safe(it2, &netdev->ipv4, next) { | |
72d0e1cb SG |
2899 | lxc_list_del(it2); |
2900 | free(it2->elem); | |
2901 | free(it2); | |
2902 | } | |
2903 | } else if (strcmp(p1, "ipv6") == 0) { | |
9ebb03ad DE |
2904 | struct lxc_list *it2,*next; |
2905 | lxc_list_for_each_safe(it2, &netdev->ipv6, next) { | |
72d0e1cb SG |
2906 | lxc_list_del(it2); |
2907 | free(it2->elem); | |
2908 | free(it2); | |
2909 | } | |
2910 | } else if (strcmp(p1, "link") == 0) { | |
2911 | if (netdev->link) { | |
2912 | free(netdev->link); | |
2913 | netdev->link = NULL; | |
2914 | } | |
2915 | } else if (strcmp(p1, "name") == 0) { | |
2916 | if (netdev->name) { | |
2917 | free(netdev->name); | |
2918 | netdev->name = NULL; | |
2919 | } | |
2920 | } else if (strcmp(p1, "script.up") == 0) { | |
2921 | if (netdev->upscript) { | |
2922 | free(netdev->upscript); | |
2923 | netdev->upscript = NULL; | |
2924 | } | |
2925 | } else if (strcmp(p1, "hwaddr") == 0) { | |
2926 | if (netdev->hwaddr) { | |
2927 | free(netdev->hwaddr); | |
2928 | netdev->hwaddr = NULL; | |
2929 | } | |
2930 | } else if (strcmp(p1, "mtu") == 0) { | |
2931 | if (netdev->mtu) { | |
2932 | free(netdev->mtu); | |
2933 | netdev->mtu = NULL; | |
2934 | } | |
2935 | } else if (strcmp(p1, "ipv4_gateway") == 0) { | |
2936 | if (netdev->ipv4_gateway) { | |
2937 | free(netdev->ipv4_gateway); | |
2938 | netdev->ipv4_gateway = NULL; | |
2939 | } | |
2940 | } else if (strcmp(p1, "ipv6_gateway") == 0) { | |
2941 | if (netdev->ipv6_gateway) { | |
2942 | free(netdev->ipv6_gateway); | |
2943 | netdev->ipv6_gateway = NULL; | |
2944 | } | |
2945 | } | |
2946 | else return -1; | |
2947 | ||
2948 | return 0; | |
2949 | } | |
2950 | ||
2951 | int lxc_clear_config_network(struct lxc_conf *c) | |
2952 | { | |
9ebb03ad DE |
2953 | struct lxc_list *it,*next; |
2954 | lxc_list_for_each_safe(it, &c->network, next) { | |
72d0e1cb SG |
2955 | lxc_remove_nic(it); |
2956 | } | |
2957 | return 0; | |
2958 | } | |
2959 | ||
2960 | int lxc_clear_config_caps(struct lxc_conf *c) | |
2961 | { | |
9ebb03ad | 2962 | struct lxc_list *it,*next; |
72d0e1cb | 2963 | |
9ebb03ad | 2964 | lxc_list_for_each_safe(it, &c->caps, next) { |
72d0e1cb SG |
2965 | lxc_list_del(it); |
2966 | free(it->elem); | |
2967 | free(it); | |
2968 | } | |
2969 | return 0; | |
2970 | } | |
2971 | ||
12a50cc6 | 2972 | int lxc_clear_cgroups(struct lxc_conf *c, const char *key) |
72d0e1cb | 2973 | { |
9ebb03ad | 2974 | struct lxc_list *it,*next; |
72d0e1cb | 2975 | bool all = false; |
12a50cc6 | 2976 | const char *k = key + 11; |
72d0e1cb SG |
2977 | |
2978 | if (strcmp(key, "lxc.cgroup") == 0) | |
2979 | all = true; | |
2980 | ||
9ebb03ad | 2981 | lxc_list_for_each_safe(it, &c->cgroup, next) { |
72d0e1cb SG |
2982 | struct lxc_cgroup *cg = it->elem; |
2983 | if (!all && strcmp(cg->subsystem, k) != 0) | |
2984 | continue; | |
2985 | lxc_list_del(it); | |
2986 | free(cg->subsystem); | |
2987 | free(cg->value); | |
2988 | free(cg); | |
2989 | free(it); | |
2990 | } | |
2991 | return 0; | |
2992 | } | |
2993 | ||
2994 | int lxc_clear_mount_entries(struct lxc_conf *c) | |
2995 | { | |
9ebb03ad | 2996 | struct lxc_list *it,*next; |
72d0e1cb | 2997 | |
9ebb03ad | 2998 | lxc_list_for_each_safe(it, &c->mount_list, next) { |
72d0e1cb SG |
2999 | lxc_list_del(it); |
3000 | free(it->elem); | |
3001 | free(it); | |
3002 | } | |
3003 | return 0; | |
3004 | } | |
3005 | ||
12a50cc6 | 3006 | int lxc_clear_hooks(struct lxc_conf *c, const char *key) |
72d0e1cb | 3007 | { |
9ebb03ad | 3008 | struct lxc_list *it,*next; |
17ed13a3 | 3009 | bool all = false, done = false; |
12a50cc6 | 3010 | const char *k = key + 9; |
72d0e1cb SG |
3011 | int i; |
3012 | ||
17ed13a3 SH |
3013 | if (strcmp(key, "lxc.hook") == 0) |
3014 | all = true; | |
3015 | ||
72d0e1cb | 3016 | for (i=0; i<NUM_LXC_HOOKS; i++) { |
17ed13a3 | 3017 | if (all || strcmp(k, lxchook_names[i]) == 0) { |
9ebb03ad | 3018 | lxc_list_for_each_safe(it, &c->hooks[i], next) { |
17ed13a3 SH |
3019 | lxc_list_del(it); |
3020 | free(it->elem); | |
3021 | free(it); | |
3022 | } | |
3023 | done = true; | |
72d0e1cb SG |
3024 | } |
3025 | } | |
17ed13a3 SH |
3026 | |
3027 | if (!done) { | |
3028 | ERROR("Invalid hook key: %s", key); | |
3029 | return -1; | |
3030 | } | |
72d0e1cb SG |
3031 | return 0; |
3032 | } | |
8eb5694b | 3033 | |
7b35f3d6 SH |
3034 | void lxc_clear_saved_nics(struct lxc_conf *conf) |
3035 | { | |
3036 | int i; | |
3037 | ||
3038 | if (!conf->num_savednics) | |
3039 | return; | |
3040 | for (i=0; i < conf->num_savednics; i++) | |
3041 | free(conf->saved_nics[i].orig_name); | |
3042 | conf->saved_nics = 0; | |
3043 | free(conf->saved_nics); | |
3044 | } | |
3045 | ||
8eb5694b SH |
3046 | void lxc_conf_free(struct lxc_conf *conf) |
3047 | { | |
3048 | if (!conf) | |
3049 | return; | |
3050 | if (conf->console.path) | |
3051 | free(conf->console.path); | |
ae9242c8 | 3052 | if (conf->rootfs.mount != default_rootfs_mount) |
8eb5694b | 3053 | free(conf->rootfs.mount); |
d95db067 DE |
3054 | if (conf->rootfs.path) |
3055 | free(conf->rootfs.path); | |
3056 | if (conf->utsname) | |
3057 | free(conf->utsname); | |
3058 | if (conf->ttydir) | |
3059 | free(conf->ttydir); | |
3060 | if (conf->fstab) | |
3061 | free(conf->fstab); | |
8eb5694b | 3062 | lxc_clear_config_network(conf); |
1f530df6 | 3063 | #if HAVE_APPARMOR |
8eb5694b SH |
3064 | if (conf->aa_profile) |
3065 | free(conf->aa_profile); | |
1f530df6 | 3066 | #endif |
769872f9 | 3067 | lxc_seccomp_free(conf); |
8eb5694b SH |
3068 | lxc_clear_config_caps(conf); |
3069 | lxc_clear_cgroups(conf, "lxc.cgroup"); | |
17ed13a3 | 3070 | lxc_clear_hooks(conf, "lxc.hook"); |
8eb5694b | 3071 | lxc_clear_mount_entries(conf); |
7b35f3d6 | 3072 | lxc_clear_saved_nics(conf); |
8eb5694b SH |
3073 | free(conf); |
3074 | } |