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