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