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git.proxmox.com Git - mirror_lxc.git/blob - src/lxc/confile_utils.c
3 * Copyright © 2017 Christian Brauner <christian.brauner@ubuntu.com>.
4 * Copyright © 2017 Canonical Ltd.
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.
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.
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.
26 #include <arpa/inet.h>
30 #include "confile_utils.h"
38 lxc_log_define(lxc_confile_utils
, lxc
);
40 int parse_idmaps(const char *idmap
, char *type
, unsigned long *nsid
,
41 unsigned long *hostid
, unsigned long *range
)
44 unsigned long tmp_hostid
, tmp_nsid
, tmp_range
;
49 /* Duplicate string. */
54 /* A prototypical idmap entry would be: "u 1000 1000000 65536" */
59 slide
+= strspn(slide
, " \t\r");
60 if (slide
!= window
&& *slide
== '\0')
64 if (*slide
!= 'u' && *slide
!= 'g')
69 /* move beyond type */
73 /* Validate that only whitespace follows. */
74 slide
+= strspn(slide
, " \t\r");
75 /* There must be whitespace. */
79 /* Mark beginning of nsuid. */
81 /* Validate that non-whitespace follows. */
82 slide
+= strcspn(slide
, " \t\r");
83 /* There must be non-whitespace. */
84 if (slide
== window
|| *slide
== '\0')
86 /* Mark end of nsuid. */
90 if (lxc_safe_ulong(window
, &tmp_nsid
) < 0)
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.
105 /* Mark beginning of hostid. */
107 /* Validate that non-whitespace follows. */
108 slide
+= strcspn(slide
, " \t\r");
109 /* There must be non-whitespace. */
110 if (slide
== window
|| *slide
== '\0')
112 /* Mark end of nsuid. */
116 if (lxc_safe_ulong(window
, &tmp_hostid
) < 0)
119 /* Move beyond \0. */
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.
131 /* Mark beginning of range. */
133 /* Validate that non-whitespace follows. */
134 slide
+= strcspn(slide
, " \t\r");
135 /* There must be non-whitespace. */
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.
142 if (*(slide
+ strspn(slide
, " \t\r\n")) != '\0')
144 /* Mark end of range. */
148 if (lxc_safe_ulong(window
, &tmp_range
) < 0)
153 *hostid
= tmp_hostid
;
156 /* Yay, we survived. */
165 bool lxc_config_value_empty(const char *value
)
167 if (value
&& strlen(value
) > 0)
173 struct lxc_netdev
*lxc_network_add(struct lxc_list
*networks
, int idx
, bool tail
)
175 struct lxc_list
*newlist
;
176 struct lxc_netdev
*netdev
= NULL
;
178 /* network does not exist */
179 netdev
= malloc(sizeof(*netdev
));
183 memset(netdev
, 0, sizeof(*netdev
));
184 lxc_list_init(&netdev
->ipv4
);
185 lxc_list_init(&netdev
->ipv6
);
186 netdev
->name
[0] = '\0';
187 netdev
->link
[0] = '\0';
188 memset(&netdev
->priv
, 0, sizeof(netdev
->priv
));
189 /* I'm not completely sure if the memset takes care to zero the arrays
190 * in the union as well. So let's make extra sure and set the first byte
191 * to zero so that we don't have any surprises.
193 netdev
->priv
.veth_attr
.pair
[0] = '\0';
194 netdev
->priv
.veth_attr
.veth1
[0] = '\0';
196 /* give network a unique index */
199 /* prepare new list */
200 newlist
= malloc(sizeof(*newlist
));
206 lxc_list_init(newlist
);
207 newlist
->elem
= netdev
;
210 lxc_list_add_tail(networks
, newlist
);
212 lxc_list_add(networks
, newlist
);
216 /* Takes care of finding the correct netdev struct in the networks list or
217 * allocates a new one if it couldn't be found.
219 struct lxc_netdev
*lxc_get_netdev_by_idx(struct lxc_conf
*conf
,
220 unsigned int idx
, bool allocate
)
222 struct lxc_netdev
*netdev
= NULL
;
223 struct lxc_list
*networks
= &conf
->network
;
224 struct lxc_list
*insert
= networks
;
227 if (!lxc_list_empty(networks
)) {
228 lxc_list_for_each(insert
, networks
) {
229 netdev
= insert
->elem
;
230 if (netdev
->idx
== idx
)
232 else if (netdev
->idx
> idx
)
240 return lxc_network_add(insert
, idx
, true);
243 void lxc_log_configured_netdevs(const struct lxc_conf
*conf
)
245 struct lxc_netdev
*netdev
;
246 struct lxc_list
*it
= (struct lxc_list
*)&conf
->network
;;
248 if ((conf
->loglevel
!= LXC_LOG_LEVEL_TRACE
) &&
249 (lxc_log_get_level() != LXC_LOG_LEVEL_TRACE
))
252 if (lxc_list_empty(it
)) {
253 TRACE("container has no networks configured");
257 lxc_list_for_each(it
, &conf
->network
) {
258 struct lxc_list
*cur
, *next
;
259 struct lxc_inetdev
*inet4dev
;
260 struct lxc_inet6dev
*inet6dev
;
261 char bufinet4
[INET_ADDRSTRLEN
], bufinet6
[INET6_ADDRSTRLEN
];
265 TRACE("index: %zd", netdev
->idx
);
266 TRACE("ifindex: %d", netdev
->ifindex
);
267 switch (netdev
->type
) {
270 if (netdev
->priv
.veth_attr
.pair
[0] != '\0')
271 TRACE("veth pair: %s",
272 netdev
->priv
.veth_attr
.pair
);
273 if (netdev
->priv
.veth_attr
.veth1
[0] != '\0')
275 netdev
->priv
.veth_attr
.veth1
);
276 if (netdev
->priv
.veth_attr
.ifindex
> 0)
277 TRACE("host side ifindex for veth device: %d",
278 netdev
->priv
.veth_attr
.ifindex
);
280 case LXC_NET_MACVLAN
:
281 TRACE("type: macvlan");
282 if (netdev
->priv
.macvlan_attr
.mode
> 0) {
284 macvlan_mode
= lxc_macvlan_flag_to_mode(
285 netdev
->priv
.macvlan_attr
.mode
);
286 TRACE("macvlan mode: %s",
287 macvlan_mode
? macvlan_mode
293 TRACE("vlan id: %d", netdev
->priv
.vlan_attr
.vid
);
297 if (netdev
->priv
.phys_attr
.ifindex
> 0) {
298 TRACE("host side ifindex for phys device: %d",
299 netdev
->priv
.phys_attr
.ifindex
);
303 TRACE("type: empty");
309 ERROR("invalid network type %d", netdev
->type
);
313 if (netdev
->type
!= LXC_NET_EMPTY
) {
315 netdev
->flags
== IFF_UP
? "up" : "none");
316 if (netdev
->link
[0] != '\0')
317 TRACE("link: %s", netdev
->link
);
318 if (netdev
->name
[0] != '\0')
319 TRACE("name: %s", netdev
->name
);
321 TRACE("hwaddr: %s", netdev
->hwaddr
);
323 TRACE("mtu: %s", netdev
->mtu
);
324 if (netdev
->upscript
)
325 TRACE("upscript: %s", netdev
->upscript
);
326 if (netdev
->downscript
)
327 TRACE("downscript: %s", netdev
->downscript
);
329 TRACE("ipv4 gateway auto: %s",
330 netdev
->ipv4_gateway_auto
? "true" : "false");
332 if (netdev
->ipv4_gateway
) {
333 inet_ntop(AF_INET
, netdev
->ipv4_gateway
,
334 bufinet4
, sizeof(bufinet4
));
335 TRACE("ipv4 gateway: %s", bufinet4
);
338 lxc_list_for_each_safe(cur
, &netdev
->ipv4
, next
) {
339 inet4dev
= cur
->elem
;
340 inet_ntop(AF_INET
, &inet4dev
->addr
, bufinet4
,
342 TRACE("ipv4 addr: %s", bufinet4
);
345 TRACE("ipv6 gateway auto: %s",
346 netdev
->ipv6_gateway_auto
? "true" : "false");
347 if (netdev
->ipv6_gateway
) {
348 inet_ntop(AF_INET6
, netdev
->ipv6_gateway
,
349 bufinet6
, sizeof(bufinet6
));
350 TRACE("ipv6 gateway: %s", bufinet6
);
352 lxc_list_for_each_safe(cur
, &netdev
->ipv6
, next
) {
353 inet6dev
= cur
->elem
;
354 inet_ntop(AF_INET6
, &inet6dev
->addr
, bufinet6
,
356 TRACE("ipv6 addr: %s", bufinet6
);
362 static void lxc_free_netdev(struct lxc_netdev
*netdev
)
364 struct lxc_list
*cur
, *next
;
366 free(netdev
->upscript
);
367 free(netdev
->downscript
);
368 free(netdev
->hwaddr
);
371 free(netdev
->ipv4_gateway
);
372 lxc_list_for_each_safe(cur
, &netdev
->ipv4
, next
) {
378 free(netdev
->ipv6_gateway
);
379 lxc_list_for_each_safe(cur
, &netdev
->ipv6
, next
) {
388 bool lxc_remove_nic_by_idx(struct lxc_conf
*conf
, unsigned int idx
)
390 struct lxc_list
*cur
, *next
;
391 struct lxc_netdev
*netdev
;
394 lxc_list_for_each_safe(cur
, &conf
->network
, next
) {
396 if (netdev
->idx
!= idx
)
407 lxc_free_netdev(netdev
);
413 void lxc_free_networks(struct lxc_list
*networks
)
415 struct lxc_list
*cur
, *next
;
416 struct lxc_netdev
*netdev
;
418 lxc_list_for_each_safe(cur
, networks
, next
) {
420 lxc_free_netdev(netdev
);
424 /* prevent segfaults */
425 lxc_list_init(networks
);
428 static struct macvlan_mode
{
432 { "private", MACVLAN_MODE_PRIVATE
},
433 { "vepa", MACVLAN_MODE_VEPA
},
434 { "bridge", MACVLAN_MODE_BRIDGE
},
435 { "passthru", MACVLAN_MODE_PASSTHRU
},
438 int lxc_macvlan_mode_to_flag(int *mode
, const char *value
)
442 for (i
= 0; i
< sizeof(macvlan_mode
) / sizeof(macvlan_mode
[0]); i
++) {
443 if (strcmp(macvlan_mode
[i
].name
, value
))
446 *mode
= macvlan_mode
[i
].mode
;
453 char *lxc_macvlan_flag_to_mode(int mode
)
457 for (i
= 0; i
< sizeof(macvlan_mode
) / sizeof(macvlan_mode
[0]); i
++) {
458 if (macvlan_mode
[i
].mode
== mode
)
461 return macvlan_mode
[i
].name
;
467 int set_config_string_item(char **conf_item
, const char *value
)
471 if (lxc_config_value_empty(value
)) {
477 new_value
= strdup(value
);
479 SYSERROR("failed to duplicate string \"%s\"", value
);
484 *conf_item
= new_value
;
488 int set_config_string_item_max(char **conf_item
, const char *value
, size_t max
)
490 if (strlen(value
) >= max
) {
491 ERROR("%s is too long (>= %lu)", value
, (unsigned long)max
);
495 return set_config_string_item(conf_item
, value
);
498 int set_config_path_item(char **conf_item
, const char *value
)
500 return set_config_string_item_max(conf_item
, value
, PATH_MAX
);
503 int config_ip_prefix(struct in_addr
*addr
)
505 if (IN_CLASSA(addr
->s_addr
))
506 return 32 - IN_CLASSA_NSHIFT
;
507 if (IN_CLASSB(addr
->s_addr
))
508 return 32 - IN_CLASSB_NSHIFT
;
509 if (IN_CLASSC(addr
->s_addr
))
510 return 32 - IN_CLASSC_NSHIFT
;
515 int network_ifname(char *valuep
, const char *value
)
517 if (strlen(value
) >= IFNAMSIZ
) {
518 ERROR("Network devie name \"%s\" is too long (>= %zu)", value
,
522 strcpy(valuep
, value
);
526 int rand_complete_hwaddr(char *hwaddr
)
528 const char hex
[] = "0123456789abcdef";
536 seed
= randseed(false);
538 while (*curs
!= '\0' && *curs
!= '\n') {
539 if (*curs
== 'x' || *curs
== 'X') {
540 if (curs
- hwaddr
== 1) {
541 /* ensure address is unicast */
543 *curs
= hex
[rand_r(&seed
) & 0x0E];
545 *curs
= hex
[rand_r(&seed
) & 0x0F];
547 *curs
= hex
[rand() & 0x0E];
549 *curs
= hex
[rand() & 0x0F];
558 bool lxc_config_net_hwaddr(const char *line
)
562 if (strncmp(line
, "lxc.net", 7) != 0)
564 if (strncmp(line
, "lxc.network.hwaddr", 18) == 0)
567 /* We have to dup the line, if line is something like
568 * "lxc.net.[i].xxx = xxxxx ", we need to remove
569 * '[i]' and compare its key with 'lxc.net.hwaddr'*/
572 SYSERROR("failed to allocate memory");
575 if (*(copy
+ 8) >= '0' && *(copy
+ 8) <= '9') {
576 p
= strchr(copy
+ 8, '.');
581 /* strlen("hwaddr") = 6 */
582 strncpy(copy
+ 8, p
+ 1, 6);
585 if (strncmp(copy
, "lxc.net.hwaddr", 14) == 0) {
591 /* We have to dup the line second time, if line is something like
592 * "lxc.network.[i].xxx = xxxxx ", we need to remove
593 * '[i]' and compare its key with 'lxc.network.hwaddr'*/
596 SYSERROR("failed to allocate memory");
599 if (*(copy
+ 12) >= '0' && *(copy
+ 12) <= '9') {
600 p
= strchr(copy
+ 12, '.');
605 /* strlen("hwaddr") = 6 */
606 strncpy(copy
+ 12, p
+ 1, 6);
609 if (strncmp(copy
, "lxc.network.hwaddr", 18) == 0) {
619 * If we find a lxc.net.[i].hwaddr or lxc.network.hwaddr in the original config
620 * file, we expand it in the unexpanded_config, so that after a save_config we
621 * store the hwaddr for re-use.
622 * This is only called when reading the config file, not when executing a
624 * 'x' and 'X' are substituted in-place.
626 void update_hwaddr(const char *line
)
630 line
+= lxc_char_left_gc(line
, strlen(line
));
634 if (!lxc_config_net_hwaddr(line
))
637 /* Let config_net_hwaddr raise the error. */
638 p
= strchr(line
, '=');
649 rand_complete_hwaddr(p
);
652 bool new_hwaddr(char *hwaddr
)
656 (void)randseed(true);
658 ret
= snprintf(hwaddr
, 18, "00:16:3e:%02x:%02x:%02x", rand() % 255,
659 rand() % 255, rand() % 255);
660 if (ret
< 0 || ret
>= 18) {
661 SYSERROR("Failed to call snprintf().");
668 int lxc_get_conf_str(char *retv
, int inlen
, const char *value
)
672 if (retv
&& inlen
>= strlen(value
) + 1)
673 strncpy(retv
, value
, strlen(value
) + 1);
675 return strlen(value
);
678 int lxc_get_conf_int(struct lxc_conf
*c
, char *retv
, int inlen
, int v
)
683 memset(retv
, 0, inlen
);
685 return snprintf(retv
, inlen
, "%d", v
);
688 bool parse_limit_value(const char **value
, unsigned long *res
)
692 if (strncmp(*value
, "unlimited", sizeof("unlimited") - 1) == 0) {
693 *res
= RLIM_INFINITY
;
694 *value
+= sizeof("unlimited") - 1;
699 *res
= strtoul(*value
, &endptr
, 10);
700 if (errno
|| !endptr
)