src/lxc/confile_utils.c

   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
  20 #ifndef _GNU_SOURCE
  21 #define _GNU_SOURCE 1
  22 #endif
  23 #include <arpa/inet.h>
  24 #include <ctype.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 #include "conf.h"
  30 #include "config.h"
  31 #include "confile.h"
  32 #include "confile_utils.h"
  33 #include "error.h"
  34 #include "list.h"
  35 #include "log.h"
  36 #include "lxccontainer.h"
  37 #include "macro.h"
  38 #include "network.h"
  39 #include "parse.h"
  40 #include "utils.h"
  41
  42 #ifndef HAVE_STRLCPY
  43 #include "include/strlcpy.h"
  44 #endif
  45
  46 lxc_log_define(confile_utils, lxc);
  47
  48 int parse_idmaps(const char *idmap, char *type, unsigned long *nsid,
  49                  unsigned long *hostid, unsigned long *range)
  50 {
  51         int ret = -1;
  52         unsigned long tmp_hostid, tmp_nsid, tmp_range;
  53         char tmp_type;
  54         char *window, *slide;
  55         char *dup = NULL;
  56
  57         /* Duplicate string. */
  58         dup = strdup(idmap);
  59         if (!dup)
  60                 goto on_error;
  61
  62         /* A prototypical idmap entry would be: "u 1000 1000000 65536" */
  63
  64         /* align */
  65         slide = window = dup;
  66         /* skip whitespace */
  67         slide += strspn(slide, " \t\r");
  68         if (slide != window && *slide == '\0')
  69                 goto on_error;
  70
  71         /* Validate type. */
  72         if (*slide != 'u' && *slide != 'g') {
  73                 ERROR("Invalid id mapping type: %c", *slide);
  74                 goto on_error;
  75         }
  76
  77         /* Assign type. */
  78         tmp_type = *slide;
  79
  80         /* move beyond type */
  81         slide++;
  82         /* align */
  83         window = slide;
  84         /* Validate that only whitespace follows. */
  85         slide += strspn(slide, " \t\r");
  86         /* There must be whitespace. */
  87         if (slide == window)
  88                 goto on_error;
  89
  90         /* Mark beginning of nsid. */
  91         window = slide;
  92         /* Validate that non-whitespace follows. */
  93         slide += strcspn(slide, " \t\r");
  94         /* There must be non-whitespace. */
  95         if (slide == window || *slide == '\0')
  96                 goto on_error;
  97         /* Mark end of nsid. */
  98         *slide = '\0';
  99
 100         /* Parse nsid. */
 101         if (lxc_safe_ulong(window, &tmp_nsid) < 0) {
 102                 ERROR("Failed to parse nsid: %s", window);
 103                 goto on_error;
 104         }
 105
 106         /* Move beyond \0. */
 107         slide++;
 108         /* Validate that only whitespace follows. */
 109         slide += strspn(slide, " \t\r");
 110         /* If there was only one whitespace then we whiped it with our \0 above.
 111          * So only ensure that we're not at the end of the string.
 112          */
 113         if (*slide == '\0')
 114                 goto on_error;
 115
 116         /* Mark beginning of hostid. */
 117         window = slide;
 118         /* Validate that non-whitespace follows. */
 119         slide += strcspn(slide, " \t\r");
 120         /* There must be non-whitespace. */
 121         if (slide == window || *slide == '\0')
 122                 goto on_error;
 123         /* Mark end of nsid. */
 124         *slide = '\0';
 125
 126         /* Parse hostid. */
 127         if (lxc_safe_ulong(window, &tmp_hostid) < 0) {
 128                 ERROR("Failed to parse hostid: %s", window);
 129                 goto on_error;
 130         }
 131
 132         /* Move beyond \0. */
 133         slide++;
 134         /* Validate that only whitespace follows. */
 135         slide += strspn(slide, " \t\r");
 136         /* If there was only one whitespace then we whiped it with our \0 above.
 137          * So only ensure that we're not at the end of the string.
 138          */
 139         if (*slide == '\0')
 140                 goto on_error;
 141
 142         /* Mark beginning of range. */
 143         window = slide;
 144         /* Validate that non-whitespace follows. */
 145         slide += strcspn(slide, " \t\r");
 146         /* There must be non-whitespace. */
 147         if (slide == window)
 148                 goto on_error;
 149
 150         /* The range is the last valid entry we expect. So make sure that there
 151          * is no trailing garbage and if there is, error out.
 152          */
 153         if (*(slide + strspn(slide, " \t\r\n")) != '\0')
 154                 goto on_error;
 155
 156         /* Mark end of range. */
 157         *slide = '\0';
 158
 159         /* Parse range. */
 160         if (lxc_safe_ulong(window, &tmp_range) < 0) {
 161                 ERROR("Failed to parse id mapping range: %s", window);
 162                 goto on_error;
 163         }
 164
 165         *type = tmp_type;
 166         *nsid = tmp_nsid;
 167         *hostid = tmp_hostid;
 168         *range = tmp_range;
 169
 170         /* Yay, we survived. */
 171         ret = 0;
 172
 173 on_error:
 174         free(dup);
 175
 176         return ret;
 177 }
 178
 179 bool lxc_config_value_empty(const char *value)
 180 {
 181         if (value && strlen(value) > 0)
 182                 return false;
 183
 184         return true;
 185 }
 186
 187 struct lxc_netdev *lxc_network_add(struct lxc_list *networks, int idx, bool tail)
 188 {
 189         struct lxc_list *newlist;
 190         struct lxc_netdev *netdev = NULL;
 191
 192         /* network does not exist */
 193         netdev = malloc(sizeof(*netdev));
 194         if (!netdev)
 195                 return NULL;
 196
 197         memset(netdev, 0, sizeof(*netdev));
 198         lxc_list_init(&netdev->ipv4);
 199         lxc_list_init(&netdev->ipv6);
 200
 201         /* give network a unique index */
 202         netdev->idx = idx;
 203
 204         /* prepare new list */
 205         newlist = malloc(sizeof(*newlist));
 206         if (!newlist) {
 207                 free(netdev);
 208                 return NULL;
 209         }
 210
 211         lxc_list_init(newlist);
 212         newlist->elem = netdev;
 213
 214         if (tail)
 215                 lxc_list_add_tail(networks, newlist);
 216         else
 217                 lxc_list_add(networks, newlist);
 218
 219         return netdev;
 220 }
 221
 222 /* Takes care of finding the correct netdev struct in the networks list or
 223  * allocates a new one if it couldn't be found.
 224  */
 225 struct lxc_netdev *lxc_get_netdev_by_idx(struct lxc_conf *conf,
 226                                          unsigned int idx, bool allocate)
 227 {
 228         struct lxc_netdev *netdev = NULL;
 229         struct lxc_list *networks = &conf->network;
 230         struct lxc_list *insert = networks;
 231
 232         /* lookup network */
 233         if (!lxc_list_empty(networks)) {
 234                 lxc_list_for_each(insert, networks) {
 235                         netdev = insert->elem;
 236                         if (netdev->idx == idx)
 237                                 return netdev;
 238                         else if (netdev->idx > idx)
 239                                 break;
 240                 }
 241         }
 242
 243         if (!allocate)
 244                 return NULL;
 245
 246         return lxc_network_add(insert, idx, true);
 247 }
 248
 249 void lxc_log_configured_netdevs(const struct lxc_conf *conf)
 250 {
 251         struct lxc_netdev *netdev;
 252         struct lxc_list *it = (struct lxc_list *)&conf->network;;
 253
 254         if ((conf->loglevel != LXC_LOG_LEVEL_TRACE) &&
 255             (lxc_log_get_level() != LXC_LOG_LEVEL_TRACE))
 256                 return;
 257
 258         if (lxc_list_empty(it)) {
 259                 TRACE("container has no networks configured");
 260                 return;
 261         }
 262
 263         lxc_list_for_each(it, &conf->network) {
 264                 struct lxc_list *cur, *next;
 265                 struct lxc_inetdev *inet4dev;
 266                 struct lxc_inet6dev *inet6dev;
 267                 char bufinet4[INET_ADDRSTRLEN], bufinet6[INET6_ADDRSTRLEN];
 268
 269                 netdev = it->elem;
 270
 271                 TRACE("index: %zd", netdev->idx);
 272                 TRACE("ifindex: %d", netdev->ifindex);
 273
 274                 switch (netdev->type) {
 275                 case LXC_NET_VETH:
 276                         TRACE("type: veth");
 277
 278                         if (netdev->priv.veth_attr.pair[0] != '\0')
 279                                 TRACE("veth pair: %s",
 280                                       netdev->priv.veth_attr.pair);
 281
 282                         if (netdev->priv.veth_attr.veth1[0] != '\0')
 283                                 TRACE("veth1 : %s",
 284                                       netdev->priv.veth_attr.veth1);
 285
 286                         if (netdev->priv.veth_attr.ifindex > 0)
 287                                 TRACE("host side ifindex for veth device: %d",
 288                                       netdev->priv.veth_attr.ifindex);
 289                         break;
 290                 case LXC_NET_MACVLAN:
 291                         TRACE("type: macvlan");
 292
 293                         if (netdev->priv.macvlan_attr.mode > 0) {
 294                                 char *mode;
 295
 296                                 mode = lxc_macvlan_flag_to_mode(
 297                                     netdev->priv.macvlan_attr.mode);
 298                                 TRACE("macvlan mode: %s",
 299                                       mode ? mode : "(invalid mode)");
 300                         }
 301                         break;
 302                 case LXC_NET_VLAN:
 303                         TRACE("type: vlan");
 304                         TRACE("vlan id: %d", netdev->priv.vlan_attr.vid);
 305                         break;
 306                 case LXC_NET_PHYS:
 307                         TRACE("type: phys");
 308
 309                         if (netdev->priv.phys_attr.ifindex > 0)
 310                                 TRACE("host side ifindex for phys device: %d",
 311                                       netdev->priv.phys_attr.ifindex);
 312                         break;
 313                 case LXC_NET_EMPTY:
 314                         TRACE("type: empty");
 315                         break;
 316                 case LXC_NET_NONE:
 317                         TRACE("type: none");
 318                         break;
 319                 default:
 320                         ERROR("invalid network type %d", netdev->type);
 321                         return;
 322                 }
 323
 324                 if (netdev->type != LXC_NET_EMPTY) {
 325                         TRACE("flags: %s",
 326                               netdev->flags == IFF_UP ? "up" : "none");
 327
 328                         if (netdev->link[0] != '\0')
 329                                 TRACE("link: %s", netdev->link);
 330
 331                         if (netdev->name[0] != '\0')
 332                                 TRACE("name: %s", netdev->name);
 333
 334                         if (netdev->hwaddr)
 335                                 TRACE("hwaddr: %s", netdev->hwaddr);
 336
 337                         if (netdev->mtu)
 338                                 TRACE("mtu: %s", netdev->mtu);
 339
 340                         if (netdev->upscript)
 341                                 TRACE("upscript: %s", netdev->upscript);
 342
 343                         if (netdev->downscript)
 344                                 TRACE("downscript: %s", netdev->downscript);
 345
 346                         TRACE("ipv4 gateway auto: %s",
 347                               netdev->ipv4_gateway_auto ? "true" : "false");
 348
 349                         if (netdev->ipv4_gateway) {
 350                                 inet_ntop(AF_INET, netdev->ipv4_gateway,
 351                                           bufinet4, sizeof(bufinet4));
 352                                 TRACE("ipv4 gateway: %s", bufinet4);
 353                         }
 354
 355                         lxc_list_for_each_safe(cur, &netdev->ipv4, next) {
 356                                 inet4dev = cur->elem;
 357                                 inet_ntop(AF_INET, &inet4dev->addr, bufinet4,
 358                                           sizeof(bufinet4));
 359                                 TRACE("ipv4 addr: %s", bufinet4);
 360                         }
 361
 362                         TRACE("ipv6 gateway auto: %s",
 363                               netdev->ipv6_gateway_auto ? "true" : "false");
 364
 365                         if (netdev->ipv6_gateway) {
 366                                 inet_ntop(AF_INET6, netdev->ipv6_gateway,
 367                                           bufinet6, sizeof(bufinet6));
 368                                 TRACE("ipv6 gateway: %s", bufinet6);
 369                         }
 370
 371                         lxc_list_for_each_safe(cur, &netdev->ipv6, next) {
 372                                 inet6dev = cur->elem;
 373                                 inet_ntop(AF_INET6, &inet6dev->addr, bufinet6,
 374                                           sizeof(bufinet6));
 375                                 TRACE("ipv6 addr: %s", bufinet6);
 376                         }
 377                 }
 378         }
 379 }
 380
 381 static void lxc_free_netdev(struct lxc_netdev *netdev)
 382 {
 383         struct lxc_list *cur, *next;
 384
 385         free(netdev->upscript);
 386         free(netdev->downscript);
 387         free(netdev->hwaddr);
 388         free(netdev->mtu);
 389
 390         free(netdev->ipv4_gateway);
 391         lxc_list_for_each_safe(cur, &netdev->ipv4, next) {
 392                 lxc_list_del(cur);
 393                 free(cur->elem);
 394                 free(cur);
 395         }
 396
 397         free(netdev->ipv6_gateway);
 398         lxc_list_for_each_safe(cur, &netdev->ipv6, next) {
 399                 lxc_list_del(cur);
 400                 free(cur->elem);
 401                 free(cur);
 402         }
 403
 404         free(netdev);
 405 }
 406
 407 bool lxc_remove_nic_by_idx(struct lxc_conf *conf, unsigned int idx)
 408 {
 409         struct lxc_list *cur, *next;
 410         struct lxc_netdev *netdev;
 411         bool found = false;
 412
 413         lxc_list_for_each_safe(cur, &conf->network, next) {
 414                 netdev = cur->elem;
 415                 if (netdev->idx != idx)
 416                         continue;
 417
 418                 lxc_list_del(cur);
 419                 found = true;
 420                 break;
 421         }
 422
 423         if (!found)
 424                 return false;
 425
 426         lxc_free_netdev(netdev);
 427         free(cur);
 428
 429         return true;
 430 }
 431
 432 void lxc_free_networks(struct lxc_list *networks)
 433 {
 434         struct lxc_list *cur, *next;
 435         struct lxc_netdev *netdev;
 436
 437         lxc_list_for_each_safe(cur, networks, next) {
 438                 netdev = cur->elem;
 439                 lxc_free_netdev(netdev);
 440                 free(cur);
 441         }
 442
 443         /* prevent segfaults */
 444         lxc_list_init(networks);
 445 }
 446
 447 static struct lxc_macvlan_mode {
 448         char *name;
 449         int mode;
 450 } macvlan_mode[] = {
 451     { "private",  MACVLAN_MODE_PRIVATE  },
 452     { "vepa",     MACVLAN_MODE_VEPA     },
 453     { "bridge",   MACVLAN_MODE_BRIDGE   },
 454     { "passthru", MACVLAN_MODE_PASSTHRU },
 455 };
 456
 457 int lxc_macvlan_mode_to_flag(int *mode, const char *value)
 458 {
 459         size_t i;
 460
 461         for (i = 0; i < sizeof(macvlan_mode) / sizeof(macvlan_mode[0]); i++) {
 462                 if (strcmp(macvlan_mode[i].name, value))
 463                         continue;
 464
 465                 *mode = macvlan_mode[i].mode;
 466                 return 0;
 467         }
 468
 469         return -1;
 470 }
 471
 472 char *lxc_macvlan_flag_to_mode(int mode)
 473 {
 474         size_t i;
 475
 476         for (i = 0; i < sizeof(macvlan_mode) / sizeof(macvlan_mode[0]); i++) {
 477                 if (macvlan_mode[i].mode == mode)
 478                         continue;
 479
 480                 return macvlan_mode[i].name;
 481         }
 482
 483         return NULL;
 484 }
 485
 486 int set_config_string_item(char **conf_item, const char *value)
 487 {
 488         char *new_value;
 489
 490         if (lxc_config_value_empty(value)) {
 491                 free(*conf_item);
 492                 *conf_item = NULL;
 493                 return 0;
 494         }
 495
 496         new_value = strdup(value);
 497         if (!new_value) {
 498                 SYSERROR("Failed to duplicate string \"%s\"", value);
 499                 return -1;
 500         }
 501
 502         free(*conf_item);
 503         *conf_item = new_value;
 504         return 0;
 505 }
 506
 507 int set_config_string_item_max(char **conf_item, const char *value, size_t max)
 508 {
 509         if (strlen(value) >= max) {
 510                 ERROR("%s is too long (>= %lu)", value, (unsigned long)max);
 511                 return -1;
 512         }
 513
 514         return set_config_string_item(conf_item, value);
 515 }
 516
 517 int set_config_path_item(char **conf_item, const char *value)
 518 {
 519         return set_config_string_item_max(conf_item, value, PATH_MAX);
 520 }
 521
 522 int config_ip_prefix(struct in_addr *addr)
 523 {
 524         if (IN_CLASSA(addr->s_addr))
 525                 return 32 - IN_CLASSA_NSHIFT;
 526
 527         if (IN_CLASSB(addr->s_addr))
 528                 return 32 - IN_CLASSB_NSHIFT;
 529
 530         if (IN_CLASSC(addr->s_addr))
 531                 return 32 - IN_CLASSC_NSHIFT;
 532
 533         return 0;
 534 }
 535
 536 int network_ifname(char *valuep, const char *value, size_t size)
 537 {
 538         size_t retlen;
 539
 540         if (!valuep || !value)
 541                 return -1;
 542
 543         retlen = strlcpy(valuep, value, size);
 544         if (retlen >= size)
 545                 ERROR("Network device name \"%s\" is too long (>= %zu)", value,
 546                       size);
 547
 548         return 0;
 549 }
 550
 551 void rand_complete_hwaddr(char *hwaddr)
 552 {
 553         const char hex[] = "0123456789abcdef";
 554         char *curs = hwaddr;
 555 #ifdef HAVE_RAND_R
 556         unsigned int seed;
 557
 558         seed = randseed(false);
 559 #else
 560
 561         (void)randseed(true);
 562 #endif
 563
 564         while (*curs != '\0' && *curs != '\n') {
 565                 if (*curs == 'x' || *curs == 'X') {
 566                         if (curs - hwaddr == 1) {
 567                                 /* ensure address is unicast */
 568 #ifdef HAVE_RAND_R
 569                                 *curs = hex[rand_r(&seed) & 0x0E];
 570                         } else {
 571                                 *curs = hex[rand_r(&seed) & 0x0F];
 572 #else
 573                                 *curs = hex[rand() & 0x0E];
 574                         } else {
 575                                 *curs = hex[rand() & 0x0F];
 576 #endif
 577                         }
 578                 }
 579                 curs++;
 580         }
 581 }
 582
 583 bool lxc_config_net_hwaddr(const char *line)
 584 {
 585         unsigned index;
 586         char tmp[7];
 587
 588         if (strncmp(line, "lxc.net", 7) != 0)
 589                 return false;
 590
 591         if (strncmp(line, "lxc.net.hwaddr", 14) == 0)
 592                 return true;
 593
 594         if (strncmp(line, "lxc.network.hwaddr", 18) == 0)
 595                 return true;
 596
 597         if (sscanf(line, "lxc.net.%u.%6s", &index, tmp) == 2 ||
 598             sscanf(line, "lxc.network.%u.%6s", &index, tmp) == 2)
 599                 return strncmp(tmp, "hwaddr", 6) == 0;
 600
 601         return false;
 602 }
 603
 604 /*
 605  * If we find a lxc.net.[i].hwaddr or lxc.network.hwaddr in the original config
 606  * file, we expand it in the unexpanded_config, so that after a save_config we
 607  * store the hwaddr for re-use.
 608  * This is only called when reading the config file, not when executing a
 609  * lxc.include.
 610  * 'x' and 'X' are substituted in-place.
 611  */
 612 void update_hwaddr(const char *line)
 613 {
 614         char *p;
 615
 616         line += lxc_char_left_gc(line, strlen(line));
 617         if (line[0] == '#')
 618                 return;
 619
 620         if (!lxc_config_net_hwaddr(line))
 621                 return;
 622
 623         /* Let config_net_hwaddr raise the error. */
 624         p = strchr(line, '=');
 625         if (!p)
 626                 return;
 627         p++;
 628
 629         while (isblank(*p))
 630                 p++;
 631
 632         if (!*p)
 633                 return;
 634
 635         rand_complete_hwaddr(p);
 636 }
 637
 638 bool new_hwaddr(char *hwaddr)
 639 {
 640         int ret;
 641 #ifdef HAVE_RAND_R
 642         unsigned int seed;
 643
 644         seed = randseed(false);
 645
 646         ret = snprintf(hwaddr, 18, "00:16:3e:%02x:%02x:%02x", rand_r(&seed) % 255,
 647                        rand_r(&seed) % 255, rand_r(&seed) % 255);
 648 #else
 649
 650         (void)randseed(true);
 651
 652         ret = snprintf(hwaddr, 18, "00:16:3e:%02x:%02x:%02x", rand() % 255,
 653                        rand() % 255, rand() % 255);
 654 #endif
 655         if (ret < 0 || ret >= 18) {
 656                 SYSERROR("Failed to call snprintf()");
 657                 return false;
 658         }
 659
 660         return true;
 661 }
 662
 663 int lxc_get_conf_str(char *retv, int inlen, const char *value)
 664 {
 665         size_t value_len;
 666
 667         if (!value)
 668                 return 0;
 669
 670         value_len = strlen(value);
 671         if (retv && inlen >= value_len + 1)
 672                 memcpy(retv, value, value_len + 1);
 673
 674         return value_len;
 675 }
 676
 677 int lxc_get_conf_bool(struct lxc_conf *c, char *retv, int inlen, bool v)
 678 {
 679         int len;
 680         int fulllen = 0;
 681
 682         if (!retv)
 683                 inlen = 0;
 684         else
 685                 memset(retv, 0, inlen);
 686
 687         strprint(retv, inlen, "%d", v);
 688
 689         return fulllen;
 690 }
 691
 692 int lxc_get_conf_int(struct lxc_conf *c, char *retv, int inlen, int v)
 693 {
 694         int len;
 695         int fulllen = 0;
 696
 697         if (!retv)
 698                 inlen = 0;
 699         else
 700                 memset(retv, 0, inlen);
 701
 702         strprint(retv, inlen, "%d", v);
 703
 704         return fulllen;
 705 }
 706
 707 int lxc_get_conf_size_t(struct lxc_conf *c, char *retv, int inlen, size_t v)
 708 {
 709         int len;
 710         int fulllen = 0;
 711
 712         if (!retv)
 713                 inlen = 0;
 714         else
 715                 memset(retv, 0, inlen);
 716
 717         strprint(retv, inlen, "%zu", v);
 718
 719         return fulllen;
 720 }
 721
 722 int lxc_get_conf_uint64(struct lxc_conf *c, char *retv, int inlen, uint64_t v)
 723 {
 724         int len;
 725         int fulllen = 0;
 726
 727         if (!retv)
 728                 inlen = 0;
 729         else
 730                 memset(retv, 0, inlen);
 731
 732         strprint(retv, inlen, "%"PRIu64, v);
 733
 734         return fulllen;
 735 }
 736
 737 bool parse_limit_value(const char **value, rlim_t *res)
 738 {
 739         char *endptr = NULL;
 740
 741         if (strncmp(*value, "unlimited", STRLITERALLEN("unlimited")) == 0) {
 742                 *res = RLIM_INFINITY;
 743                 *value += STRLITERALLEN("unlimited");
 744                 return true;
 745         }
 746
 747         errno = 0;
 748         *res = strtoull(*value, &endptr, 10);
 749         if (errno || !endptr)
 750                 return false;
 751
 752         *value = endptr;
 753
 754         return true;
 755 }
 756
 757 static int lxc_container_name_to_pid(const char *lxcname_or_pid,
 758                                      const char *lxcpath)
 759 {
 760         int ret;
 761         signed long int pid;
 762         char *err = NULL;
 763
 764         pid = strtol(lxcname_or_pid, &err, 10);
 765         if (*err != '\0' || pid < 1) {
 766                 struct lxc_container *c;
 767
 768                 c = lxc_container_new(lxcname_or_pid, lxcpath);
 769                 if (!c) {
 770                         ERROR("\"%s\" is not a valid pid nor a container name",
 771                               lxcname_or_pid);
 772                         return -1;
 773                 }
 774
 775                 if (!c->may_control(c)) {
 776                         ERROR("Insufficient privileges to control container "
 777                               "\"%s\"", c->name);
 778                         lxc_container_put(c);
 779                         return -1;
 780                 }
 781
 782                 pid = c->init_pid(c);
 783                 if (pid < 1) {
 784                         ERROR("Container \"%s\" is not running", c->name);
 785                         lxc_container_put(c);
 786                         return -1;
 787                 }
 788
 789                 lxc_container_put(c);
 790         }
 791
 792         ret = kill(pid, 0);
 793         if (ret < 0) {
 794                 SYSERROR("Failed to send signal to pid %d", (int)pid);
 795                 return -1;
 796         }
 797
 798         return pid;
 799 }
 800
 801 int lxc_inherit_namespace(const char *lxcname_or_pid, const char *lxcpath,
 802                           const char *namespace)
 803 {
 804         int fd, pid;
 805         char *dup, *lastslash;
 806
 807         lastslash = strrchr(lxcname_or_pid, '/');
 808         if (lastslash) {
 809                 dup = strdup(lxcname_or_pid);
 810                 if (!dup)
 811                         return -1;
 812
 813                 dup[lastslash - lxcname_or_pid] = '\0';
 814                 pid = lxc_container_name_to_pid(lastslash + 1, dup);
 815                 free(dup);
 816         } else {
 817                 pid = lxc_container_name_to_pid(lxcname_or_pid, lxcpath);
 818         }
 819
 820         if (pid < 0)
 821                 return -1;
 822
 823         fd = lxc_preserve_ns(pid, namespace);
 824         if (fd < 0)
 825                 return -1;
 826
 827         return fd;
 828 }
 829
 830 struct signame {
 831         int num;
 832         const char *name;
 833 };
 834
 835 static const struct signame signames[] = {
 836         { SIGHUP,    "HUP"    },
 837         { SIGINT,    "INT"    },
 838         { SIGQUIT,   "QUIT"   },
 839         { SIGILL,    "ILL"    },
 840         { SIGABRT,   "ABRT"   },
 841         { SIGFPE,    "FPE"    },
 842         { SIGKILL,   "KILL"   },
 843         { SIGSEGV,   "SEGV"   },
 844         { SIGPIPE,   "PIPE"   },
 845         { SIGALRM,   "ALRM"   },
 846         { SIGTERM,   "TERM"   },
 847         { SIGUSR1,   "USR1"   },
 848         { SIGUSR2,   "USR2"   },
 849         { SIGCHLD,   "CHLD"   },
 850         { SIGCONT,   "CONT"   },
 851         { SIGSTOP,   "STOP"   },
 852         { SIGTSTP,   "TSTP"   },
 853         { SIGTTIN,   "TTIN"   },
 854         { SIGTTOU,   "TTOU"   },
 855 #ifdef SIGTRAP
 856         { SIGTRAP,   "TRAP"   },
 857 #endif
 858 #ifdef SIGIOT
 859         { SIGIOT,    "IOT"    },
 860 #endif
 861 #ifdef SIGEMT
 862         { SIGEMT,    "EMT"    },
 863 #endif
 864 #ifdef SIGBUS
 865         { SIGBUS,    "BUS"    },
 866 #endif
 867 #ifdef SIGSTKFLT
 868         { SIGSTKFLT, "STKFLT" },
 869 #endif
 870 #ifdef SIGCLD
 871         { SIGCLD,    "CLD"    },
 872 #endif
 873 #ifdef SIGURG
 874         { SIGURG,    "URG"    },
 875 #endif
 876 #ifdef SIGXCPU
 877         { SIGXCPU,   "XCPU"   },
 878 #endif
 879 #ifdef SIGXFSZ
 880         { SIGXFSZ,   "XFSZ"   },
 881 #endif
 882 #ifdef SIGVTALRM
 883         { SIGVTALRM, "VTALRM" },
 884 #endif
 885 #ifdef SIGPROF
 886         { SIGPROF,   "PROF"   },
 887 #endif
 888 #ifdef SIGWINCH
 889         { SIGWINCH,  "WINCH"  },
 890 #endif
 891 #ifdef SIGIO
 892         { SIGIO,     "IO"     },
 893 #endif
 894 #ifdef SIGPOLL
 895         { SIGPOLL,   "POLL"   },
 896 #endif
 897 #ifdef SIGINFO
 898         { SIGINFO,   "INFO"   },
 899 #endif
 900 #ifdef SIGLOST
 901         { SIGLOST,   "LOST"   },
 902 #endif
 903 #ifdef SIGPWR
 904         { SIGPWR,    "PWR"    },
 905 #endif
 906 #ifdef SIGUNUSED
 907         { SIGUNUSED, "UNUSED" },
 908 #endif
 909 #ifdef SIGSYS
 910         { SIGSYS,    "SYS"    },
 911 #endif
 912 };
 913
 914 static int sig_num(const char *sig)
 915 {
 916         unsigned int signum;
 917
 918         if (lxc_safe_uint(sig, &signum) < 0)
 919                 return -1;
 920
 921         return signum;
 922 }
 923
 924 static int rt_sig_num(const char *signame)
 925 {
 926         int rtmax = 0, sig_n = 0;
 927
 928         if (strncasecmp(signame, "max-", 4) == 0)
 929                 rtmax = 1;
 930
 931         signame += 4;
 932         if (!isdigit(*signame))
 933                 return -1;
 934
 935         sig_n = sig_num(signame);
 936         sig_n = rtmax ? SIGRTMAX - sig_n : SIGRTMIN + sig_n;
 937         if (sig_n > SIGRTMAX || sig_n < SIGRTMIN)
 938                 return -1;
 939
 940         return sig_n;
 941 }
 942
 943 int sig_parse(const char *signame)
 944 {
 945         size_t n;
 946
 947         if (isdigit(*signame)) {
 948                 return sig_num(signame);
 949         } else if (strncasecmp(signame, "sig", 3) == 0) {
 950                 signame += 3;
 951                 if (strncasecmp(signame, "rt", 2) == 0)
 952                         return rt_sig_num(signame + 2);
 953
 954                 for (n = 0; n < sizeof(signames) / sizeof((signames)[0]); n++)
 955                         if (strcasecmp(signames[n].name, signame) == 0)
 956                                 return signames[n].num;
 957         }
 958
 959         return -1;
 960 }