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0b843d35 CB |
1 | /* liblxcapi |
2 | * | |
3 | * Copyright © 2017 Christian Brauner <christian.brauner@ubuntu.com>. | |
4 | * Copyright © 2017 Canonical Ltd. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2, as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along | |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | */ | |
19 | ||
ce2f5ae8 CB |
20 | #include "config.h" |
21 | ||
f9373e40 | 22 | #include <ctype.h> |
0b843d35 | 23 | #include <stdio.h> |
ce2f5ae8 | 24 | #include <stdlib.h> |
0b843d35 | 25 | #include <string.h> |
9b0df30f | 26 | #include <arpa/inet.h> |
0b843d35 | 27 | |
663e9916 | 28 | #include "conf.h" |
ce2f5ae8 CB |
29 | #include "confile.h" |
30 | #include "confile_utils.h" | |
31 | #include "error.h" | |
ce2f5ae8 | 32 | #include "list.h" |
28d9e29e CB |
33 | #include "log.h" |
34 | #include "lxccontainer.h" | |
811ef482 | 35 | #include "network.h" |
f9373e40 | 36 | #include "parse.h" |
0b843d35 CB |
37 | #include "utils.h" |
38 | ||
ce2f5ae8 CB |
39 | lxc_log_define(lxc_confile_utils, lxc); |
40 | ||
0b843d35 CB |
41 | int parse_idmaps(const char *idmap, char *type, unsigned long *nsid, |
42 | unsigned long *hostid, unsigned long *range) | |
43 | { | |
44 | int ret = -1; | |
45 | unsigned long tmp_hostid, tmp_nsid, tmp_range; | |
46 | char tmp_type; | |
47 | char *window, *slide; | |
48 | char *dup = NULL; | |
49 | ||
50 | /* Duplicate string. */ | |
51 | dup = strdup(idmap); | |
52 | if (!dup) | |
53 | goto on_error; | |
54 | ||
55 | /* A prototypical idmap entry would be: "u 1000 1000000 65536" */ | |
56 | ||
57 | /* align */ | |
58 | slide = window = dup; | |
59 | /* skip whitespace */ | |
60 | slide += strspn(slide, " \t\r"); | |
61 | if (slide != window && *slide == '\0') | |
62 | goto on_error; | |
63 | ||
64 | /* Validate type. */ | |
a8b1ac78 | 65 | if (*slide != 'u' && *slide != 'g') { |
f37d1c22 | 66 | ERROR("Invalid id mapping type: %c", *slide); |
0b843d35 | 67 | goto on_error; |
a8b1ac78 TA |
68 | } |
69 | ||
0b843d35 CB |
70 | /* Assign type. */ |
71 | tmp_type = *slide; | |
72 | ||
73 | /* move beyond type */ | |
74 | slide++; | |
75 | /* align */ | |
76 | window = slide; | |
77 | /* Validate that only whitespace follows. */ | |
78 | slide += strspn(slide, " \t\r"); | |
79 | /* There must be whitespace. */ | |
80 | if (slide == window) | |
81 | goto on_error; | |
82 | ||
f37d1c22 | 83 | /* Mark beginning of nsid. */ |
0b843d35 CB |
84 | window = slide; |
85 | /* Validate that non-whitespace follows. */ | |
86 | slide += strcspn(slide, " \t\r"); | |
87 | /* There must be non-whitespace. */ | |
88 | if (slide == window || *slide == '\0') | |
89 | goto on_error; | |
f37d1c22 | 90 | /* Mark end of nsid. */ |
0b843d35 CB |
91 | *slide = '\0'; |
92 | ||
f37d1c22 | 93 | /* Parse nsid. */ |
a8b1ac78 | 94 | if (lxc_safe_ulong(window, &tmp_nsid) < 0) { |
f37d1c22 | 95 | ERROR("Failed to parse nsid: %s", window); |
0b843d35 | 96 | goto on_error; |
a8b1ac78 | 97 | } |
0b843d35 CB |
98 | |
99 | /* Move beyond \0. */ | |
100 | slide++; | |
0b843d35 CB |
101 | /* Validate that only whitespace follows. */ |
102 | slide += strspn(slide, " \t\r"); | |
103 | /* If there was only one whitespace then we whiped it with our \0 above. | |
104 | * So only ensure that we're not at the end of the string. | |
105 | */ | |
106 | if (*slide == '\0') | |
107 | goto on_error; | |
108 | ||
109 | /* Mark beginning of hostid. */ | |
110 | window = slide; | |
111 | /* Validate that non-whitespace follows. */ | |
112 | slide += strcspn(slide, " \t\r"); | |
113 | /* There must be non-whitespace. */ | |
114 | if (slide == window || *slide == '\0') | |
115 | goto on_error; | |
f37d1c22 | 116 | /* Mark end of nsid. */ |
0b843d35 CB |
117 | *slide = '\0'; |
118 | ||
119 | /* Parse hostid. */ | |
a8b1ac78 | 120 | if (lxc_safe_ulong(window, &tmp_hostid) < 0) { |
f37d1c22 | 121 | ERROR("Failed to parse hostid: %s", window); |
0b843d35 | 122 | goto on_error; |
a8b1ac78 | 123 | } |
0b843d35 CB |
124 | |
125 | /* Move beyond \0. */ | |
126 | slide++; | |
0b843d35 CB |
127 | /* Validate that only whitespace follows. */ |
128 | slide += strspn(slide, " \t\r"); | |
129 | /* If there was only one whitespace then we whiped it with our \0 above. | |
130 | * So only ensure that we're not at the end of the string. | |
131 | */ | |
132 | if (*slide == '\0') | |
133 | goto on_error; | |
134 | ||
135 | /* Mark beginning of range. */ | |
136 | window = slide; | |
137 | /* Validate that non-whitespace follows. */ | |
138 | slide += strcspn(slide, " \t\r"); | |
139 | /* There must be non-whitespace. */ | |
140 | if (slide == window) | |
141 | goto on_error; | |
142 | ||
143 | /* The range is the last valid entry we expect. So make sure that there | |
f37d1c22 | 144 | * is no trailing garbage and if there is, error out. |
0b843d35 CB |
145 | */ |
146 | if (*(slide + strspn(slide, " \t\r\n")) != '\0') | |
147 | goto on_error; | |
148 | /* Mark end of range. */ | |
149 | *slide = '\0'; | |
150 | ||
151 | /* Parse range. */ | |
a8b1ac78 | 152 | if (lxc_safe_ulong(window, &tmp_range) < 0) { |
f37d1c22 | 153 | ERROR("Failed to parse id mapping range: %s", window); |
0b843d35 | 154 | goto on_error; |
a8b1ac78 | 155 | } |
0b843d35 CB |
156 | |
157 | *type = tmp_type; | |
158 | *nsid = tmp_nsid; | |
159 | *hostid = tmp_hostid; | |
160 | *range = tmp_range; | |
161 | ||
162 | /* Yay, we survived. */ | |
163 | ret = 0; | |
164 | ||
165 | on_error: | |
166 | free(dup); | |
167 | ||
168 | return ret; | |
169 | } | |
663e9916 CB |
170 | |
171 | bool lxc_config_value_empty(const char *value) | |
172 | { | |
173 | if (value && strlen(value) > 0) | |
174 | return false; | |
175 | ||
176 | return true; | |
177 | } | |
ce2f5ae8 | 178 | |
c302b476 | 179 | struct lxc_netdev *lxc_network_add(struct lxc_list *networks, int idx, bool tail) |
ce2f5ae8 CB |
180 | { |
181 | struct lxc_list *newlist; | |
182 | struct lxc_netdev *netdev = NULL; | |
ce2f5ae8 CB |
183 | |
184 | /* network does not exist */ | |
185 | netdev = malloc(sizeof(*netdev)); | |
186 | if (!netdev) | |
187 | return NULL; | |
188 | ||
189 | memset(netdev, 0, sizeof(*netdev)); | |
190 | lxc_list_init(&netdev->ipv4); | |
191 | lxc_list_init(&netdev->ipv6); | |
192 | ||
193 | /* give network a unique index */ | |
194 | netdev->idx = idx; | |
195 | ||
196 | /* prepare new list */ | |
197 | newlist = malloc(sizeof(*newlist)); | |
198 | if (!newlist) { | |
199 | free(netdev); | |
200 | return NULL; | |
201 | } | |
202 | ||
203 | lxc_list_init(newlist); | |
204 | newlist->elem = netdev; | |
205 | ||
c302b476 CB |
206 | if (tail) |
207 | lxc_list_add_tail(networks, newlist); | |
208 | else | |
209 | lxc_list_add(networks, newlist); | |
ce2f5ae8 CB |
210 | return netdev; |
211 | } | |
1ed6ba91 | 212 | |
c302b476 CB |
213 | /* Takes care of finding the correct netdev struct in the networks list or |
214 | * allocates a new one if it couldn't be found. | |
215 | */ | |
216 | struct lxc_netdev *lxc_get_netdev_by_idx(struct lxc_conf *conf, | |
217 | unsigned int idx, bool allocate) | |
218 | { | |
219 | struct lxc_netdev *netdev = NULL; | |
220 | struct lxc_list *networks = &conf->network; | |
221 | struct lxc_list *insert = networks; | |
222 | ||
223 | /* lookup network */ | |
224 | if (!lxc_list_empty(networks)) { | |
225 | lxc_list_for_each(insert, networks) { | |
226 | netdev = insert->elem; | |
227 | if (netdev->idx == idx) | |
228 | return netdev; | |
229 | else if (netdev->idx > idx) | |
230 | break; | |
231 | } | |
232 | } | |
233 | ||
234 | if (!allocate) | |
235 | return NULL; | |
236 | ||
237 | return lxc_network_add(insert, idx, true); | |
238 | } | |
239 | ||
1ed6ba91 CB |
240 | void lxc_log_configured_netdevs(const struct lxc_conf *conf) |
241 | { | |
242 | struct lxc_netdev *netdev; | |
243 | struct lxc_list *it = (struct lxc_list *)&conf->network;; | |
244 | ||
245 | if ((conf->loglevel != LXC_LOG_LEVEL_TRACE) && | |
246 | (lxc_log_get_level() != LXC_LOG_LEVEL_TRACE)) | |
247 | return; | |
248 | ||
249 | if (lxc_list_empty(it)) { | |
250 | TRACE("container has no networks configured"); | |
251 | return; | |
252 | } | |
253 | ||
254 | lxc_list_for_each(it, &conf->network) { | |
9b0df30f CB |
255 | struct lxc_list *cur, *next; |
256 | struct lxc_inetdev *inet4dev; | |
257 | struct lxc_inet6dev *inet6dev; | |
258 | char bufinet4[INET_ADDRSTRLEN], bufinet6[INET6_ADDRSTRLEN]; | |
259 | ||
1ed6ba91 CB |
260 | netdev = it->elem; |
261 | ||
c302b476 | 262 | TRACE("index: %zd", netdev->idx); |
7a582518 | 263 | TRACE("ifindex: %d", netdev->ifindex); |
1ed6ba91 CB |
264 | switch (netdev->type) { |
265 | case LXC_NET_VETH: | |
266 | TRACE("type: veth"); | |
de4855a8 | 267 | if (netdev->priv.veth_attr.pair[0] != '\0') |
9b0df30f CB |
268 | TRACE("veth pair: %s", |
269 | netdev->priv.veth_attr.pair); | |
8ce727fc CB |
270 | if (netdev->priv.veth_attr.veth1[0] != '\0') |
271 | TRACE("veth1 : %s", | |
272 | netdev->priv.veth_attr.veth1); | |
d952b351 CB |
273 | if (netdev->priv.veth_attr.ifindex > 0) |
274 | TRACE("host side ifindex for veth device: %d", | |
275 | netdev->priv.veth_attr.ifindex); | |
1ed6ba91 CB |
276 | break; |
277 | case LXC_NET_MACVLAN: | |
278 | TRACE("type: macvlan"); | |
9b0df30f CB |
279 | if (netdev->priv.macvlan_attr.mode > 0) { |
280 | char *macvlan_mode; | |
281 | macvlan_mode = lxc_macvlan_flag_to_mode( | |
282 | netdev->priv.macvlan_attr.mode); | |
283 | TRACE("macvlan mode: %s", | |
284 | macvlan_mode ? macvlan_mode | |
285 | : "(invalid mode)"); | |
286 | } | |
1ed6ba91 CB |
287 | break; |
288 | case LXC_NET_VLAN: | |
289 | TRACE("type: vlan"); | |
9b0df30f | 290 | TRACE("vlan id: %d", netdev->priv.vlan_attr.vid); |
1ed6ba91 CB |
291 | break; |
292 | case LXC_NET_PHYS: | |
293 | TRACE("type: phys"); | |
b809f232 CB |
294 | if (netdev->priv.phys_attr.ifindex > 0) { |
295 | TRACE("host side ifindex for phys device: %d", | |
296 | netdev->priv.phys_attr.ifindex); | |
297 | } | |
1ed6ba91 CB |
298 | break; |
299 | case LXC_NET_EMPTY: | |
300 | TRACE("type: empty"); | |
301 | break; | |
302 | case LXC_NET_NONE: | |
303 | TRACE("type: none"); | |
304 | break; | |
305 | default: | |
306 | ERROR("invalid network type %d", netdev->type); | |
307 | return; | |
308 | } | |
309 | ||
9b0df30f CB |
310 | if (netdev->type != LXC_NET_EMPTY) { |
311 | TRACE("flags: %s", | |
312 | netdev->flags == IFF_UP ? "up" : "none"); | |
de4855a8 | 313 | if (netdev->link[0] != '\0') |
9b0df30f | 314 | TRACE("link: %s", netdev->link); |
de4855a8 | 315 | if (netdev->name[0] != '\0') |
9b0df30f CB |
316 | TRACE("name: %s", netdev->name); |
317 | if (netdev->hwaddr) | |
318 | TRACE("hwaddr: %s", netdev->hwaddr); | |
319 | if (netdev->mtu) | |
320 | TRACE("mtu: %s", netdev->mtu); | |
321 | if (netdev->upscript) | |
322 | TRACE("upscript: %s", netdev->upscript); | |
323 | if (netdev->downscript) | |
324 | TRACE("downscript: %s", netdev->downscript); | |
325 | ||
326 | TRACE("ipv4 gateway auto: %s", | |
327 | netdev->ipv4_gateway_auto ? "true" : "false"); | |
328 | ||
329 | if (netdev->ipv4_gateway) { | |
330 | inet_ntop(AF_INET, netdev->ipv4_gateway, | |
331 | bufinet4, sizeof(bufinet4)); | |
332 | TRACE("ipv4 gateway: %s", bufinet4); | |
333 | } | |
334 | ||
335 | lxc_list_for_each_safe(cur, &netdev->ipv4, next) { | |
336 | inet4dev = cur->elem; | |
337 | inet_ntop(AF_INET, &inet4dev->addr, bufinet4, | |
338 | sizeof(bufinet4)); | |
339 | TRACE("ipv4 addr: %s", bufinet4); | |
340 | } | |
341 | ||
342 | TRACE("ipv6 gateway auto: %s", | |
343 | netdev->ipv6_gateway_auto ? "true" : "false"); | |
344 | if (netdev->ipv6_gateway) { | |
345 | inet_ntop(AF_INET6, netdev->ipv6_gateway, | |
346 | bufinet6, sizeof(bufinet6)); | |
347 | TRACE("ipv6 gateway: %s", bufinet6); | |
348 | } | |
349 | lxc_list_for_each_safe(cur, &netdev->ipv6, next) { | |
350 | inet6dev = cur->elem; | |
351 | inet_ntop(AF_INET6, &inet6dev->addr, bufinet6, | |
352 | sizeof(bufinet6)); | |
353 | TRACE("ipv6 addr: %s", bufinet6); | |
354 | } | |
355 | } | |
1ed6ba91 CB |
356 | } |
357 | } | |
519df1c1 | 358 | |
e5d2fd7c CB |
359 | static void lxc_free_netdev(struct lxc_netdev *netdev) |
360 | { | |
361 | struct lxc_list *cur, *next; | |
362 | ||
e5d2fd7c CB |
363 | free(netdev->upscript); |
364 | free(netdev->downscript); | |
365 | free(netdev->hwaddr); | |
366 | free(netdev->mtu); | |
367 | ||
368 | free(netdev->ipv4_gateway); | |
369 | lxc_list_for_each_safe(cur, &netdev->ipv4, next) { | |
370 | lxc_list_del(cur); | |
371 | free(cur->elem); | |
372 | free(cur); | |
373 | } | |
374 | ||
375 | free(netdev->ipv6_gateway); | |
376 | lxc_list_for_each_safe(cur, &netdev->ipv6, next) { | |
377 | lxc_list_del(cur); | |
378 | free(cur->elem); | |
379 | free(cur); | |
380 | } | |
381 | ||
382 | free(netdev); | |
383 | } | |
384 | ||
519df1c1 CB |
385 | bool lxc_remove_nic_by_idx(struct lxc_conf *conf, unsigned int idx) |
386 | { | |
e5d2fd7c | 387 | struct lxc_list *cur, *next; |
519df1c1 CB |
388 | struct lxc_netdev *netdev; |
389 | bool found = false; | |
390 | ||
391 | lxc_list_for_each_safe(cur, &conf->network, next) { | |
392 | netdev = cur->elem; | |
393 | if (netdev->idx != idx) | |
394 | continue; | |
395 | ||
396 | lxc_list_del(cur); | |
397 | found = true; | |
398 | break; | |
399 | } | |
400 | ||
401 | if (!found) | |
402 | return false; | |
403 | ||
e5d2fd7c | 404 | lxc_free_netdev(netdev); |
519df1c1 CB |
405 | free(cur); |
406 | ||
407 | return true; | |
408 | } | |
e5d2fd7c | 409 | |
c302b476 | 410 | void lxc_free_networks(struct lxc_list *networks) |
e5d2fd7c CB |
411 | { |
412 | struct lxc_list *cur, *next; | |
413 | struct lxc_netdev *netdev; | |
414 | ||
c302b476 | 415 | lxc_list_for_each_safe(cur, networks, next) { |
e5d2fd7c CB |
416 | netdev = cur->elem; |
417 | lxc_free_netdev(netdev); | |
418 | free(cur); | |
419 | } | |
420 | ||
421 | /* prevent segfaults */ | |
c302b476 | 422 | lxc_list_init(networks); |
e5d2fd7c | 423 | } |
9b0df30f CB |
424 | |
425 | static struct macvlan_mode { | |
426 | char *name; | |
427 | int mode; | |
428 | } macvlan_mode[] = { | |
429 | { "private", MACVLAN_MODE_PRIVATE }, | |
430 | { "vepa", MACVLAN_MODE_VEPA }, | |
431 | { "bridge", MACVLAN_MODE_BRIDGE }, | |
432 | { "passthru", MACVLAN_MODE_PASSTHRU }, | |
433 | }; | |
434 | ||
435 | int lxc_macvlan_mode_to_flag(int *mode, const char *value) | |
436 | { | |
437 | size_t i; | |
438 | ||
439 | for (i = 0; i < sizeof(macvlan_mode) / sizeof(macvlan_mode[0]); i++) { | |
440 | if (strcmp(macvlan_mode[i].name, value)) | |
441 | continue; | |
442 | ||
443 | *mode = macvlan_mode[i].mode; | |
444 | return 0; | |
445 | } | |
446 | ||
447 | return -1; | |
448 | } | |
449 | ||
450 | char *lxc_macvlan_flag_to_mode(int mode) | |
451 | { | |
452 | size_t i; | |
453 | ||
454 | for (i = 0; i < sizeof(macvlan_mode) / sizeof(macvlan_mode[0]); i++) { | |
455 | if (macvlan_mode[i].mode == mode) | |
456 | continue; | |
457 | ||
458 | return macvlan_mode[i].name; | |
459 | } | |
460 | ||
461 | return NULL; | |
462 | } | |
f9373e40 CB |
463 | |
464 | int set_config_string_item(char **conf_item, const char *value) | |
465 | { | |
466 | char *new_value; | |
467 | ||
468 | if (lxc_config_value_empty(value)) { | |
469 | free(*conf_item); | |
470 | *conf_item = NULL; | |
471 | return 0; | |
472 | } | |
473 | ||
474 | new_value = strdup(value); | |
475 | if (!new_value) { | |
476 | SYSERROR("failed to duplicate string \"%s\"", value); | |
477 | return -1; | |
478 | } | |
479 | ||
480 | free(*conf_item); | |
481 | *conf_item = new_value; | |
482 | return 0; | |
483 | } | |
484 | ||
485 | int set_config_string_item_max(char **conf_item, const char *value, size_t max) | |
486 | { | |
487 | if (strlen(value) >= max) { | |
488 | ERROR("%s is too long (>= %lu)", value, (unsigned long)max); | |
489 | return -1; | |
490 | } | |
491 | ||
492 | return set_config_string_item(conf_item, value); | |
493 | } | |
494 | ||
495 | int set_config_path_item(char **conf_item, const char *value) | |
496 | { | |
497 | return set_config_string_item_max(conf_item, value, PATH_MAX); | |
498 | } | |
499 | ||
500 | int config_ip_prefix(struct in_addr *addr) | |
501 | { | |
502 | if (IN_CLASSA(addr->s_addr)) | |
503 | return 32 - IN_CLASSA_NSHIFT; | |
504 | if (IN_CLASSB(addr->s_addr)) | |
505 | return 32 - IN_CLASSB_NSHIFT; | |
506 | if (IN_CLASSC(addr->s_addr)) | |
507 | return 32 - IN_CLASSC_NSHIFT; | |
508 | ||
509 | return 0; | |
510 | } | |
511 | ||
de4855a8 | 512 | int network_ifname(char *valuep, const char *value) |
f9373e40 | 513 | { |
de4855a8 CB |
514 | if (strlen(value) >= IFNAMSIZ) { |
515 | ERROR("Network devie name \"%s\" is too long (>= %zu)", value, | |
516 | (size_t)IFNAMSIZ); | |
517 | } | |
518 | ||
519 | strcpy(valuep, value); | |
520 | return 0; | |
f9373e40 CB |
521 | } |
522 | ||
523 | int rand_complete_hwaddr(char *hwaddr) | |
524 | { | |
525 | const char hex[] = "0123456789abcdef"; | |
526 | char *curs = hwaddr; | |
527 | ||
528 | #ifndef HAVE_RAND_R | |
529 | randseed(true); | |
530 | #else | |
531 | unsigned int seed; | |
532 | ||
533 | seed = randseed(false); | |
534 | #endif | |
535 | while (*curs != '\0' && *curs != '\n') { | |
536 | if (*curs == 'x' || *curs == 'X') { | |
537 | if (curs - hwaddr == 1) { | |
538 | /* ensure address is unicast */ | |
539 | #ifdef HAVE_RAND_R | |
540 | *curs = hex[rand_r(&seed) & 0x0E]; | |
541 | } else { | |
542 | *curs = hex[rand_r(&seed) & 0x0F]; | |
543 | #else | |
544 | *curs = hex[rand() & 0x0E]; | |
545 | } else { | |
546 | *curs = hex[rand() & 0x0F]; | |
547 | #endif | |
548 | } | |
549 | } | |
550 | curs++; | |
551 | } | |
552 | return 0; | |
553 | } | |
554 | ||
ce4be612 | 555 | bool lxc_config_net_hwaddr(const char *line) |
556 | { | |
44047b2b FA |
557 | unsigned index; |
558 | char tmp[7]; | |
ce4be612 | 559 | |
560 | if (strncmp(line, "lxc.net", 7) != 0) | |
561 | return false; | |
44047b2b | 562 | if (strncmp(line, "lxc.net.hwaddr", 14) == 0) |
ce4be612 | 563 | return true; |
44047b2b | 564 | if (strncmp(line, "lxc.network.hwaddr", 18) == 0) |
ce4be612 | 565 | return true; |
44047b2b FA |
566 | if (sscanf(line, "lxc.net.%u.%6s", &index, tmp) == 2 || sscanf(line, "lxc.network.%u.%6s", &index, tmp) == 2) |
567 | return strncmp(tmp, "hwaddr", 6) == 0; | |
ce4be612 | 568 | |
ce4be612 | 569 | return false; |
570 | } | |
571 | ||
f9373e40 | 572 | /* |
ae1dc8b4 | 573 | * If we find a lxc.net.[i].hwaddr or lxc.network.hwaddr in the original config |
574 | * file, we expand it in the unexpanded_config, so that after a save_config we | |
575 | * store the hwaddr for re-use. | |
f9373e40 CB |
576 | * This is only called when reading the config file, not when executing a |
577 | * lxc.include. | |
578 | * 'x' and 'X' are substituted in-place. | |
579 | */ | |
580 | void update_hwaddr(const char *line) | |
581 | { | |
582 | char *p; | |
583 | ||
584 | line += lxc_char_left_gc(line, strlen(line)); | |
585 | if (line[0] == '#') | |
586 | return; | |
587 | ||
ae1dc8b4 | 588 | if (!lxc_config_net_hwaddr(line)) |
f9373e40 CB |
589 | return; |
590 | ||
591 | /* Let config_net_hwaddr raise the error. */ | |
592 | p = strchr(line, '='); | |
593 | if (!p) | |
594 | return; | |
595 | p++; | |
596 | ||
597 | while (isblank(*p)) | |
598 | p++; | |
599 | ||
600 | if (!*p) | |
601 | return; | |
602 | ||
603 | rand_complete_hwaddr(p); | |
604 | } | |
605 | ||
606 | bool new_hwaddr(char *hwaddr) | |
607 | { | |
608 | int ret; | |
609 | ||
610 | (void)randseed(true); | |
611 | ||
612 | ret = snprintf(hwaddr, 18, "00:16:3e:%02x:%02x:%02x", rand() % 255, | |
613 | rand() % 255, rand() % 255); | |
614 | if (ret < 0 || ret >= 18) { | |
615 | SYSERROR("Failed to call snprintf()."); | |
616 | return false; | |
617 | } | |
618 | ||
619 | return true; | |
620 | } | |
953fe44f CB |
621 | |
622 | int lxc_get_conf_str(char *retv, int inlen, const char *value) | |
623 | { | |
d3bdf12c CB |
624 | size_t value_len; |
625 | ||
953fe44f CB |
626 | if (!value) |
627 | return 0; | |
d3bdf12c CB |
628 | |
629 | value_len = strlen(value); | |
630 | if (retv && inlen >= value_len + 1) | |
631 | memcpy(retv, value, value_len + 1); | |
953fe44f CB |
632 | |
633 | return strlen(value); | |
634 | } | |
635 | ||
636 | int lxc_get_conf_int(struct lxc_conf *c, char *retv, int inlen, int v) | |
637 | { | |
638 | if (!retv) | |
639 | inlen = 0; | |
640 | else | |
641 | memset(retv, 0, inlen); | |
642 | ||
643 | return snprintf(retv, inlen, "%d", v); | |
644 | } | |
240d4b74 | 645 | |
885766f5 CB |
646 | int lxc_get_conf_size_t(struct lxc_conf *c, char *retv, int inlen, size_t v) |
647 | { | |
648 | if (!retv) | |
649 | inlen = 0; | |
650 | else | |
651 | memset(retv, 0, inlen); | |
652 | ||
653 | return snprintf(retv, inlen, "%zu", v); | |
654 | } | |
655 | ||
2ea479c9 CB |
656 | int lxc_get_conf_uint64(struct lxc_conf *c, char *retv, int inlen, uint64_t v) |
657 | { | |
658 | if (!retv) | |
659 | inlen = 0; | |
660 | else | |
661 | memset(retv, 0, inlen); | |
662 | ||
663 | return snprintf(retv, inlen, "%"PRIu64, v); | |
664 | } | |
665 | ||
71460831 | 666 | bool parse_limit_value(const char **value, rlim_t *res) |
240d4b74 | 667 | { |
668 | char *endptr = NULL; | |
669 | ||
670 | if (strncmp(*value, "unlimited", sizeof("unlimited") - 1) == 0) { | |
671 | *res = RLIM_INFINITY; | |
672 | *value += sizeof("unlimited") - 1; | |
673 | return true; | |
674 | } | |
675 | ||
676 | errno = 0; | |
71460831 | 677 | *res = strtoull(*value, &endptr, 10); |
240d4b74 | 678 | if (errno || !endptr) |
679 | return false; | |
680 | *value = endptr; | |
681 | ||
682 | return true; | |
683 | } | |
28d9e29e CB |
684 | |
685 | static int lxc_container_name_to_pid(const char *lxcname_or_pid, | |
686 | const char *lxcpath) | |
687 | { | |
688 | int ret; | |
689 | signed long int pid; | |
690 | char *err = NULL; | |
691 | ||
692 | pid = strtol(lxcname_or_pid, &err, 10); | |
693 | if (*err != '\0' || pid < 1) { | |
694 | struct lxc_container *c; | |
695 | ||
696 | c = lxc_container_new(lxcname_or_pid, lxcpath); | |
697 | if (!c) { | |
698 | ERROR("\"%s\" is not a valid pid nor a container name", | |
699 | lxcname_or_pid); | |
700 | return -1; | |
701 | } | |
702 | ||
703 | if (!c->may_control(c)) { | |
704 | ERROR("Insufficient privileges to control container " | |
705 | "\"%s\"", c->name); | |
706 | lxc_container_put(c); | |
707 | return -1; | |
708 | } | |
709 | ||
710 | pid = c->init_pid(c); | |
711 | if (pid < 1) { | |
712 | ERROR("Container \"%s\" is not running", c->name); | |
713 | lxc_container_put(c); | |
714 | return -1; | |
715 | } | |
716 | ||
717 | lxc_container_put(c); | |
718 | } | |
719 | ||
720 | ret = kill(pid, 0); | |
721 | if (ret < 0) { | |
722 | ERROR("%s - Failed to send signal to pid %d", strerror(errno), | |
723 | (int)pid); | |
724 | return -EPERM; | |
725 | } | |
726 | ||
727 | return pid; | |
728 | } | |
729 | ||
730 | int lxc_inherit_namespace(const char *lxcname_or_pid, const char *lxcpath, | |
731 | const char *namespace) | |
732 | { | |
733 | int fd, pid; | |
734 | char *dup, *lastslash; | |
735 | ||
736 | lastslash = strrchr(lxcname_or_pid, '/'); | |
737 | if (lastslash) { | |
738 | dup = strdup(lxcname_or_pid); | |
739 | if (!dup) | |
740 | return -ENOMEM; | |
741 | ||
71649566 L |
742 | dup[lastslash - lxcname_or_pid] = '\0'; |
743 | pid = lxc_container_name_to_pid(lastslash + 1, dup); | |
28d9e29e CB |
744 | free(dup); |
745 | } else { | |
746 | pid = lxc_container_name_to_pid(lxcname_or_pid, lxcpath); | |
747 | } | |
748 | ||
749 | if (pid < 0) | |
750 | return -EINVAL; | |
751 | ||
752 | fd = lxc_preserve_ns(pid, namespace); | |
753 | if (fd < 0) | |
754 | return -EINVAL; | |
755 | ||
756 | return fd; | |
757 | } |