networking/ifupdown.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  *  ifupdown for busybox
   4  *  Copyright (c) 2002 Glenn McGrath
   5  *  Copyright (c) 2003-2004 Erik Andersen <andersen@codepoet.org>
   6  *
   7  *  Based on ifupdown v 0.6.4 by Anthony Towns
   8  *  Copyright (c) 1999 Anthony Towns <aj@azure.humbug.org.au>
   9  *
  10  *  Changes to upstream version
  11  *  Remove checks for kernel version, assume kernel version 2.2.0 or better.
  12  *  Lines in the interfaces file cannot wrap.
  13  *  To adhere to the FHS, the default state file is /var/run/ifstate
  14  *  (defined via CONFIG_IFUPDOWN_IFSTATE_PATH) and can be overridden by build
  15  *  configuration.
  16  *
  17  * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
  18  */
  19
  20 #include <sys/utsname.h>
  21 #include <fnmatch.h>
  22
  23 #include "libbb.h"
  24
  25 #define MAX_OPT_DEPTH 10
  26 #define EUNBALBRACK 10001
  27 #define EUNDEFVAR   10002
  28 #define EUNBALPER   10000
  29
  30 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
  31 #define MAX_INTERFACE_LENGTH 10
  32 #endif
  33
  34 #define debug_noise(args...) /*fprintf(stderr, args)*/
  35
  36 /* Forward declaration */
  37 struct interface_defn_t;
  38
  39 typedef int execfn(char *command);
  40
  41 struct method_t {
  42         const char *name;
  43         int (*up)(struct interface_defn_t *ifd, execfn *e);
  44         int (*down)(struct interface_defn_t *ifd, execfn *e);
  45 };
  46
  47 struct address_family_t {
  48         const char *name;
  49         int n_methods;
  50         const struct method_t *method;
  51 };
  52
  53 struct mapping_defn_t {
  54         struct mapping_defn_t *next;
  55
  56         int max_matches;
  57         int n_matches;
  58         char **match;
  59
  60         char *script;
  61
  62         int max_mappings;
  63         int n_mappings;
  64         char **mapping;
  65 };
  66
  67 struct variable_t {
  68         char *name;
  69         char *value;
  70 };
  71
  72 struct interface_defn_t {
  73         const struct address_family_t *address_family;
  74         const struct method_t *method;
  75
  76         char *iface;
  77         int max_options;
  78         int n_options;
  79         struct variable_t *option;
  80 };
  81
  82 struct interfaces_file_t {
  83         llist_t *autointerfaces;
  84         llist_t *ifaces;
  85         struct mapping_defn_t *mappings;
  86 };
  87
  88 #define OPTION_STR "anvf" USE_FEATURE_IFUPDOWN_MAPPING("m") "i:"
  89 enum {
  90         OPT_do_all = 0x1,
  91         OPT_no_act = 0x2,
  92         OPT_verbose = 0x4,
  93         OPT_force = 0x8,
  94         OPT_no_mappings = 0x10,
  95 };
  96 #define DO_ALL (option_mask32 & OPT_do_all)
  97 #define NO_ACT (option_mask32 & OPT_no_act)
  98 #define VERBOSE (option_mask32 & OPT_verbose)
  99 #define FORCE (option_mask32 & OPT_force)
 100 #define NO_MAPPINGS (option_mask32 & OPT_no_mappings)
 101
 102 static char **my_environ;
 103
 104 static const char *startup_PATH;
 105
 106 #if ENABLE_FEATURE_IFUPDOWN_IPV4 || ENABLE_FEATURE_IFUPDOWN_IPV6
 107
 108 static void addstr(char **bufp, const char *str, size_t str_length)
 109 {
 110         /* xasprintf trick will be smaller, but we are often
 111          * called with str_length == 1 - don't want to have
 112          * THAT much of malloc/freeing! */
 113         char *buf = *bufp;
 114         int len = (buf ? strlen(buf) : 0);
 115         str_length++;
 116         buf = xrealloc(buf, len + str_length);
 117         /* copies at most str_length-1 chars! */
 118         safe_strncpy(buf + len, str, str_length);
 119         *bufp = buf;
 120 }
 121
 122 static int strncmpz(const char *l, const char *r, size_t llen)
 123 {
 124         int i = strncmp(l, r, llen);
 125
 126         if (i == 0)
 127                 return -r[llen];
 128         return i;
 129 }
 130
 131 static char *get_var(const char *id, size_t idlen, struct interface_defn_t *ifd)
 132 {
 133         int i;
 134
 135         if (strncmpz(id, "iface", idlen) == 0) {
 136                 static char *label_buf;
 137                 //char *result;
 138
 139                 free(label_buf);
 140                 label_buf = xstrdup(ifd->iface);
 141                 // Remove virtual iface suffix - why?
 142                 // ubuntu's ifup doesn't do this
 143                 //result = strchrnul(label_buf, ':');
 144                 //*result = '\0';
 145                 return label_buf;
 146         }
 147         if (strncmpz(id, "label", idlen) == 0) {
 148                 return ifd->iface;
 149         }
 150         for (i = 0; i < ifd->n_options; i++) {
 151                 if (strncmpz(id, ifd->option[i].name, idlen) == 0) {
 152                         return ifd->option[i].value;
 153                 }
 154         }
 155         return NULL;
 156 }
 157
 158 #if ENABLE_FEATURE_IFUPDOWN_IP
 159 static int count_netmask_bits(const char *dotted_quad)
 160 {
 161 //      int result;
 162 //      unsigned a, b, c, d;
 163 //      /* Found a netmask...  Check if it is dotted quad */
 164 //      if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) != 4)
 165 //              return -1;
 166 //      if ((a|b|c|d) >> 8)
 167 //              return -1; /* one of numbers is >= 256 */
 168 //      d |= (a << 24) | (b << 16) | (c << 8); /* IP */
 169 //      d = ~d; /* 11110000 -> 00001111 */
 170
 171         /* Shorter version */
 172         int result;
 173         struct in_addr ip;
 174         unsigned d;
 175
 176         if (inet_aton(dotted_quad, &ip) == 0)
 177                 return -1; /* malformed dotted IP */
 178         d = ntohl(ip.s_addr); /* IP in host order */
 179         d = ~d; /* 11110000 -> 00001111 */
 180         if (d & (d+1)) /* check that it is in 00001111 form */
 181                 return -1; /* no it is not */
 182         result = 32;
 183         while (d) {
 184                 d >>= 1;
 185                 result--;
 186         }
 187         return result;
 188 }
 189 #endif
 190
 191 static char *parse(const char *command, struct interface_defn_t *ifd)
 192 {
 193         size_t old_pos[MAX_OPT_DEPTH] = { 0 };
 194         int okay[MAX_OPT_DEPTH] = { 1 };
 195         int opt_depth = 1;
 196         char *result = NULL;
 197
 198         while (*command) {
 199                 switch (*command) {
 200                 default:
 201                         addstr(&result, command, 1);
 202                         command++;
 203                         break;
 204                 case '\\':
 205                         if (command[1]) {
 206                                 addstr(&result, command + 1, 1);
 207                                 command += 2;
 208                         } else {
 209                                 addstr(&result, command, 1);
 210                                 command++;
 211                         }
 212                         break;
 213                 case '[':
 214                         if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) {
 215                                 old_pos[opt_depth] = result ? strlen(result) : 0;
 216                                 okay[opt_depth] = 1;
 217                                 opt_depth++;
 218                                 command += 2;
 219                         } else {
 220                                 addstr(&result, "[", 1);
 221                                 command++;
 222                         }
 223                         break;
 224                 case ']':
 225                         if (command[1] == ']' && opt_depth > 1) {
 226                                 opt_depth--;
 227                                 if (!okay[opt_depth]) {
 228                                         result[old_pos[opt_depth]] = '\0';
 229                                 }
 230                                 command += 2;
 231                         } else {
 232                                 addstr(&result, "]", 1);
 233                                 command++;
 234                         }
 235                         break;
 236                 case '%':
 237                         {
 238                                 char *nextpercent;
 239                                 char *varvalue;
 240
 241                                 command++;
 242                                 nextpercent = strchr(command, '%');
 243                                 if (!nextpercent) {
 244                                         errno = EUNBALPER;
 245                                         free(result);
 246                                         return NULL;
 247                                 }
 248
 249                                 varvalue = get_var(command, nextpercent - command, ifd);
 250
 251                                 if (varvalue) {
 252 #if ENABLE_FEATURE_IFUPDOWN_IP
 253                                         /* "hwaddress <class> <address>":
 254                                          * unlike ifconfig, ip doesnt want <class>
 255                                          * (usually "ether" keyword). Skip it. */
 256                                         if (strncmp(command, "hwaddress", 9) == 0) {
 257                                                 varvalue = skip_whitespace(skip_non_whitespace(varvalue));
 258                                         }
 259 #endif
 260                                         addstr(&result, varvalue, strlen(varvalue));
 261                                 } else {
 262 #if ENABLE_FEATURE_IFUPDOWN_IP
 263                                         /* Sigh...  Add a special case for 'ip' to convert from
 264                                          * dotted quad to bit count style netmasks.  */
 265                                         if (strncmp(command, "bnmask", 6) == 0) {
 266                                                 unsigned res;
 267                                                 varvalue = get_var("netmask", 7, ifd);
 268                                                 if (varvalue) {
 269                                                         res = count_netmask_bits(varvalue);
 270                                                         if (res > 0) {
 271                                                                 const char *argument = utoa(res);
 272                                                                 addstr(&result, argument, strlen(argument));
 273                                                                 command = nextpercent + 1;
 274                                                                 break;
 275                                                         }
 276                                                 }
 277                                         }
 278 #endif
 279                                         okay[opt_depth - 1] = 0;
 280                                 }
 281
 282                                 command = nextpercent + 1;
 283                         }
 284                         break;
 285                 }
 286         }
 287
 288         if (opt_depth > 1) {
 289                 errno = EUNBALBRACK;
 290                 free(result);
 291                 return NULL;
 292         }
 293
 294         if (!okay[0]) {
 295                 errno = EUNDEFVAR;
 296                 free(result);
 297                 return NULL;
 298         }
 299
 300         return result;
 301 }
 302
 303 /* execute() returns 1 for success and 0 for failure */
 304 static int execute(const char *command, struct interface_defn_t *ifd, execfn *exec)
 305 {
 306         char *out;
 307         int ret;
 308
 309         out = parse(command, ifd);
 310         if (!out) {
 311                 /* parse error? */
 312                 return 0;
 313         }
 314         /* out == "": parsed ok but not all needed variables known, skip */
 315         ret = out[0] ? (*exec)(out) : 1;
 316
 317         free(out);
 318         if (ret != 1) {
 319                 return 0;
 320         }
 321         return 1;
 322 }
 323 #endif
 324
 325 #if ENABLE_FEATURE_IFUPDOWN_IPV6
 326 static int loopback_up6(struct interface_defn_t *ifd, execfn *exec)
 327 {
 328 #if ENABLE_FEATURE_IFUPDOWN_IP
 329         int result;
 330         result = execute("ip addr add ::1 dev %iface%", ifd, exec);
 331         result += execute("ip link set %iface% up", ifd, exec);
 332         return ((result == 2) ? 2 : 0);
 333 #else
 334         return execute("ifconfig %iface% add ::1", ifd, exec);
 335 #endif
 336 }
 337
 338 static int loopback_down6(struct interface_defn_t *ifd, execfn *exec)
 339 {
 340 #if ENABLE_FEATURE_IFUPDOWN_IP
 341         return execute("ip link set %iface% down", ifd, exec);
 342 #else
 343         return execute("ifconfig %iface% del ::1", ifd, exec);
 344 #endif
 345 }
 346
 347 static int static_up6(struct interface_defn_t *ifd, execfn *exec)
 348 {
 349         int result;
 350 #if ENABLE_FEATURE_IFUPDOWN_IP
 351         result = execute("ip addr add %address%/%netmask% dev %iface%[[ label %label%]]", ifd, exec);
 352         result += execute("ip link set[[ mtu %mtu%]][[ address %hwaddress%]] %iface% up", ifd, exec);
 353         /* Was: "[[ ip ....%gateway% ]]". Removed extra spaces w/o checking */
 354         result += execute("[[ip route add ::/0 via %gateway%]]", ifd, exec);
 355 #else
 356         result = execute("ifconfig %iface%[[ media %media%]][[ hw %hwaddress%]][[ mtu %mtu%]] up", ifd, exec);
 357         result += execute("ifconfig %iface% add %address%/%netmask%", ifd, exec);
 358         result += execute("[[route -A inet6 add ::/0 gw %gateway%]]", ifd, exec);
 359 #endif
 360         return ((result == 3) ? 3 : 0);
 361 }
 362
 363 static int static_down6(struct interface_defn_t *ifd, execfn *exec)
 364 {
 365 #if ENABLE_FEATURE_IFUPDOWN_IP
 366         return execute("ip link set %iface% down", ifd, exec);
 367 #else
 368         return execute("ifconfig %iface% down", ifd, exec);
 369 #endif
 370 }
 371
 372 #if ENABLE_FEATURE_IFUPDOWN_IP
 373 static int v4tunnel_up(struct interface_defn_t *ifd, execfn *exec)
 374 {
 375         int result;
 376         result = execute("ip tunnel add %iface% mode sit remote "
 377                         "%endpoint%[[ local %local%]][[ ttl %ttl%]]", ifd, exec);
 378         result += execute("ip link set %iface% up", ifd, exec);
 379         result += execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec);
 380         result += execute("[[ip route add ::/0 via %gateway%]]", ifd, exec);
 381         return ((result == 4) ? 4 : 0);
 382 }
 383
 384 static int v4tunnel_down(struct interface_defn_t * ifd, execfn * exec)
 385 {
 386         return execute("ip tunnel del %iface%", ifd, exec);
 387 }
 388 #endif
 389
 390 static const struct method_t methods6[] = {
 391 #if ENABLE_FEATURE_IFUPDOWN_IP
 392         { "v4tunnel", v4tunnel_up, v4tunnel_down, },
 393 #endif
 394         { "static", static_up6, static_down6, },
 395         { "loopback", loopback_up6, loopback_down6, },
 396 };
 397
 398 static const struct address_family_t addr_inet6 = {
 399         "inet6",
 400         ARRAY_SIZE(methods6),
 401         methods6
 402 };
 403 #endif /* FEATURE_IFUPDOWN_IPV6 */
 404
 405 #if ENABLE_FEATURE_IFUPDOWN_IPV4
 406 static int loopback_up(struct interface_defn_t *ifd, execfn *exec)
 407 {
 408 #if ENABLE_FEATURE_IFUPDOWN_IP
 409         int result;
 410         result = execute("ip addr add 127.0.0.1/8 dev %iface%", ifd, exec);
 411         result += execute("ip link set %iface% up", ifd, exec);
 412         return ((result == 2) ? 2 : 0);
 413 #else
 414         return execute("ifconfig %iface% 127.0.0.1 up", ifd, exec);
 415 #endif
 416 }
 417
 418 static int loopback_down(struct interface_defn_t *ifd, execfn *exec)
 419 {
 420 #if ENABLE_FEATURE_IFUPDOWN_IP
 421         int result;
 422         result = execute("ip addr flush dev %iface%", ifd, exec);
 423         result += execute("ip link set %iface% down", ifd, exec);
 424         return ((result == 2) ? 2 : 0);
 425 #else
 426         return execute("ifconfig %iface% 127.0.0.1 down", ifd, exec);
 427 #endif
 428 }
 429
 430 static int static_up(struct interface_defn_t *ifd, execfn *exec)
 431 {
 432         int result;
 433 #if ENABLE_FEATURE_IFUPDOWN_IP
 434         result = execute("ip addr add %address%/%bnmask%[[ broadcast %broadcast%]] "
 435                         "dev %iface%[[ peer %pointopoint%]][[ label %label%]]", ifd, exec);
 436         result += execute("ip link set[[ mtu %mtu%]][[ address %hwaddress%]] %iface% up", ifd, exec);
 437         result += execute("[[ip route add default via %gateway% dev %iface%]]", ifd, exec);
 438         return ((result == 3) ? 3 : 0);
 439 #else
 440         /* ifconfig said to set iface up before it processes hw %hwaddress%,
 441          * which then of course fails. Thus we run two separate ifconfig */
 442         result = execute("ifconfig %iface%[[ hw %hwaddress%]][[ media %media%]][[ mtu %mtu%]] up",
 443                                 ifd, exec);
 444         result += execute("ifconfig %iface% %address% netmask %netmask%"
 445                                 "[[ broadcast %broadcast%]][[ pointopoint %pointopoint%]] ",
 446                                 ifd, exec);
 447         result += execute("[[route add default gw %gateway% %iface%]]", ifd, exec);
 448         return ((result == 3) ? 3 : 0);
 449 #endif
 450 }
 451
 452 static int static_down(struct interface_defn_t *ifd, execfn *exec)
 453 {
 454         int result;
 455 #if ENABLE_FEATURE_IFUPDOWN_IP
 456         result = execute("ip addr flush dev %iface%", ifd, exec);
 457         result += execute("ip link set %iface% down", ifd, exec);
 458 #else
 459         /* result = execute("[[route del default gw %gateway% %iface%]]", ifd, exec); */
 460         /* Bringing the interface down deletes the routes in itself.
 461            Otherwise this fails if we reference 'gateway' when using this from dhcp_down */
 462         result = 1;
 463         result += execute("ifconfig %iface% down", ifd, exec);
 464 #endif
 465         return ((result == 2) ? 2 : 0);
 466 }
 467
 468 #if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
 469 struct dhcp_client_t
 470 {
 471         const char *name;
 472         const char *startcmd;
 473         const char *stopcmd;
 474 };
 475
 476 static const struct dhcp_client_t ext_dhcp_clients[] = {
 477         { "dhcpcd",
 478                 "dhcpcd[[ -h %hostname%]][[ -i %vendor%]][[ -I %clientid%]][[ -l %leasetime%]] %iface%",
 479                 "dhcpcd -k %iface%",
 480         },
 481         { "dhclient",
 482                 "dhclient -pf /var/run/dhclient.%iface%.pid %iface%",
 483                 "kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null",
 484         },
 485         { "pump",
 486                 "pump -i %iface%[[ -h %hostname%]][[ -l %leasehours%]]",
 487                 "pump -i %iface% -k",
 488         },
 489         { "udhcpc",
 490                 "udhcpc -R -n -p /var/run/udhcpc.%iface%.pid -i %iface%[[ -H %hostname%]][[ -c %clientid%]]"
 491                                 "[[ -s %script%]][[ %udhcpc_opts%]]",
 492                 "kill `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
 493         },
 494 };
 495 #endif /* ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCPC */
 496
 497 #if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
 498 static int dhcp_up(struct interface_defn_t *ifd, execfn *exec)
 499 {
 500         unsigned i;
 501 #if ENABLE_FEATURE_IFUPDOWN_IP
 502         /* ip doesn't up iface when it configures it (unlike ifconfig) */
 503         if (!execute("ip link set[[ address %hwaddress%]] %iface% up", ifd, exec))
 504                 return 0;
 505 #else
 506         /* needed if we have hwaddress on dhcp iface */
 507         if (!execute("ifconfig %iface%[[ hw %hwaddress%]] up", ifd, exec))
 508                 return 0;
 509 #endif
 510         for (i = 0; i < ARRAY_SIZE(ext_dhcp_clients); i++) {
 511                 if (exists_execable(ext_dhcp_clients[i].name))
 512                         return execute(ext_dhcp_clients[i].startcmd, ifd, exec);
 513         }
 514         bb_error_msg("no dhcp clients found");
 515         return 0;
 516 }
 517 #elif ENABLE_APP_UDHCPC
 518 static int dhcp_up(struct interface_defn_t *ifd, execfn *exec)
 519 {
 520 #if ENABLE_FEATURE_IFUPDOWN_IP
 521         /* ip doesn't up iface when it configures it (unlike ifconfig) */
 522         if (!execute("ip link set[[ address %hwaddress%]] %iface% up", ifd, exec))
 523                 return 0;
 524 #else
 525         /* needed if we have hwaddress on dhcp iface */
 526         if (!execute("ifconfig %iface%[[ hw %hwaddress%]] up", ifd, exec))
 527                 return 0;
 528 #endif
 529         return execute("udhcpc -R -n -p /var/run/udhcpc.%iface%.pid "
 530                         "-i %iface%[[ -H %hostname%]][[ -c %clientid%]][[ -s %script%]][[ %udhcpc_opts%]]",
 531                         ifd, exec);
 532 }
 533 #else
 534 static int dhcp_up(struct interface_defn_t *ifd UNUSED_PARAM,
 535                 execfn *exec UNUSED_PARAM)
 536 {
 537         return 0; /* no dhcp support */
 538 }
 539 #endif
 540
 541 #if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
 542 static int dhcp_down(struct interface_defn_t *ifd, execfn *exec)
 543 {
 544         int result = 0;
 545         unsigned i;
 546
 547         for (i = 0; i < ARRAY_SIZE(ext_dhcp_clients); i++) {
 548                 if (exists_execable(ext_dhcp_clients[i].name)) {
 549                         result += execute(ext_dhcp_clients[i].stopcmd, ifd, exec);
 550                         if (result)
 551                                 break;
 552                 }
 553         }
 554
 555         if (!result)
 556                 bb_error_msg("warning: no dhcp clients found and stopped");
 557
 558         /* Sleep a bit, otherwise static_down tries to bring down interface too soon,
 559            and it may come back up because udhcpc is still shutting down */
 560         usleep(100000);
 561         result += static_down(ifd, exec);
 562         return ((result == 3) ? 3 : 0);
 563 }
 564 #elif ENABLE_APP_UDHCPC
 565 static int dhcp_down(struct interface_defn_t *ifd, execfn *exec)
 566 {
 567         int result;
 568         result = execute("kill "
 569                        "`cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec);
 570         /* Also bring the hardware interface down since
 571            killing the dhcp client alone doesn't do it.
 572            This enables consecutive ifup->ifdown->ifup */
 573         /* Sleep a bit, otherwise static_down tries to bring down interface too soon,
 574            and it may come back up because udhcpc is still shutting down */
 575         usleep(100000);
 576         result += static_down(ifd, exec);
 577         return ((result == 3) ? 3 : 0);
 578 }
 579 #else
 580 static int dhcp_down(struct interface_defn_t *ifd UNUSED_PARAM,
 581                 execfn *exec UNUSED_PARAM)
 582 {
 583         return 0; /* no dhcp support */
 584 }
 585 #endif
 586
 587 static int manual_up_down(struct interface_defn_t *ifd UNUSED_PARAM, execfn *exec UNUSED_PARAM)
 588 {
 589         return 1;
 590 }
 591
 592 static int bootp_up(struct interface_defn_t *ifd, execfn *exec)
 593 {
 594         return execute("bootpc[[ --bootfile %bootfile%]] --dev %iface%"
 595                         "[[ --server %server%]][[ --hwaddr %hwaddr%]]"
 596                         " --returniffail --serverbcast", ifd, exec);
 597 }
 598
 599 static int ppp_up(struct interface_defn_t *ifd, execfn *exec)
 600 {
 601         return execute("pon[[ %provider%]]", ifd, exec);
 602 }
 603
 604 static int ppp_down(struct interface_defn_t *ifd, execfn *exec)
 605 {
 606         return execute("poff[[ %provider%]]", ifd, exec);
 607 }
 608
 609 static int wvdial_up(struct interface_defn_t *ifd, execfn *exec)
 610 {
 611         return execute("start-stop-daemon --start -x wvdial "
 612                 "-p /var/run/wvdial.%iface% -b -m --[[ %provider%]]", ifd, exec);
 613 }
 614
 615 static int wvdial_down(struct interface_defn_t *ifd, execfn *exec)
 616 {
 617         return execute("start-stop-daemon --stop -x wvdial "
 618                         "-p /var/run/wvdial.%iface% -s 2", ifd, exec);
 619 }
 620
 621 static const struct method_t methods[] = {
 622         { "manual", manual_up_down, manual_up_down, },
 623         { "wvdial", wvdial_up, wvdial_down, },
 624         { "ppp", ppp_up, ppp_down, },
 625         { "static", static_up, static_down, },
 626         { "bootp", bootp_up, static_down, },
 627         { "dhcp", dhcp_up, dhcp_down, },
 628         { "loopback", loopback_up, loopback_down, },
 629 };
 630
 631 static const struct address_family_t addr_inet = {
 632         "inet",
 633         ARRAY_SIZE(methods),
 634         methods
 635 };
 636
 637 #endif  /* if ENABLE_FEATURE_IFUPDOWN_IPV4 */
 638
 639 static char *next_word(char **buf)
 640 {
 641         unsigned length;
 642         char *word;
 643
 644         /* Skip over leading whitespace */
 645         word = skip_whitespace(*buf);
 646
 647         /* Stop on EOL */
 648         if (*word == '\0')
 649                 return NULL;
 650
 651         /* Find the length of this word (can't be 0) */
 652         length = strcspn(word, " \t\n");
 653
 654         /* Unless we are already at NUL, store NUL and advance */
 655         if (word[length] != '\0')
 656                 word[length++] = '\0';
 657
 658         *buf = word + length;
 659
 660         return word;
 661 }
 662
 663 static const struct address_family_t *get_address_family(const struct address_family_t *const af[], char *name)
 664 {
 665         int i;
 666
 667         if (!name)
 668                 return NULL;
 669
 670         for (i = 0; af[i]; i++) {
 671                 if (strcmp(af[i]->name, name) == 0) {
 672                         return af[i];
 673                 }
 674         }
 675         return NULL;
 676 }
 677
 678 static const struct method_t *get_method(const struct address_family_t *af, char *name)
 679 {
 680         int i;
 681
 682         if (!name)
 683                 return NULL;
 684         /* TODO: use index_in_str_array() */
 685         for (i = 0; i < af->n_methods; i++) {
 686                 if (strcmp(af->method[i].name, name) == 0) {
 687                         return &af->method[i];
 688                 }
 689         }
 690         return NULL;
 691 }
 692
 693 static const llist_t *find_list_string(const llist_t *list, const char *string)
 694 {
 695         if (string == NULL)
 696                 return NULL;
 697
 698         while (list) {
 699                 if (strcmp(list->data, string) == 0) {
 700                         return list;
 701                 }
 702                 list = list->link;
 703         }
 704         return NULL;
 705 }
 706
 707 static struct interfaces_file_t *read_interfaces(const char *filename)
 708 {
 709         /* Let's try to be compatible.
 710          *
 711          * "man 5 interfaces" says:
 712          * Lines starting with "#" are ignored. Note that end-of-line
 713          * comments are NOT supported, comments must be on a line of their own.
 714          * A line may be extended across multiple lines by making
 715          * the last character a backslash.
 716          *
 717          * Seen elsewhere in example config file:
 718          * A first non-blank "#" character makes the rest of the line
 719          * be ignored. Blank lines are ignored. Lines may be indented freely.
 720          * A "\" character at the very end of the line indicates the next line
 721          * should be treated as a continuation of the current one.
 722          */
 723 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
 724         struct mapping_defn_t *currmap = NULL;
 725 #endif
 726         struct interface_defn_t *currif = NULL;
 727         struct interfaces_file_t *defn;
 728         FILE *f;
 729         char *buf;
 730         char *first_word;
 731         char *rest_of_line;
 732         enum { NONE, IFACE, MAPPING } currently_processing = NONE;
 733
 734         defn = xzalloc(sizeof(*defn));
 735         f = xfopen_for_read(filename);
 736
 737         while ((buf = xmalloc_fgetline(f)) != NULL) {
 738 #if ENABLE_DESKTOP
 739                 /* Trailing "\" concatenates lines */
 740                 char *p;
 741                 while ((p = last_char_is(buf, '\\')) != NULL) {
 742                         *p = '\0';
 743                         rest_of_line = xmalloc_fgetline(f);
 744                         if (!rest_of_line)
 745                                 break;
 746                         p = xasprintf("%s%s", buf, rest_of_line);
 747                         free(buf);
 748                         free(rest_of_line);
 749                         buf = p;
 750                 }
 751 #endif
 752                 rest_of_line = buf;
 753                 first_word = next_word(&rest_of_line);
 754                 if (!first_word || *first_word == '#') {
 755                         free(buf);
 756                         continue; /* blank/comment line */
 757                 }
 758
 759                 if (strcmp(first_word, "mapping") == 0) {
 760 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
 761                         currmap = xzalloc(sizeof(*currmap));
 762
 763                         while ((first_word = next_word(&rest_of_line)) != NULL) {
 764                                 currmap->match = xrealloc_vector(currmap->match, 4, currmap->n_matches);
 765                                 currmap->match[currmap->n_matches++] = xstrdup(first_word);
 766                         }
 767                         /*currmap->max_mappings = 0; - done by xzalloc */
 768                         /*currmap->n_mappings = 0;*/
 769                         /*currmap->mapping = NULL;*/
 770                         /*currmap->script = NULL;*/
 771                         {
 772                                 struct mapping_defn_t **where = &defn->mappings;
 773                                 while (*where != NULL) {
 774                                         where = &(*where)->next;
 775                                 }
 776                                 *where = currmap;
 777                                 /*currmap->next = NULL;*/
 778                         }
 779                         debug_noise("Added mapping\n");
 780 #endif
 781                         currently_processing = MAPPING;
 782                 } else if (strcmp(first_word, "iface") == 0) {
 783                         static const struct address_family_t *const addr_fams[] = {
 784 #if ENABLE_FEATURE_IFUPDOWN_IPV4
 785                                 &addr_inet,
 786 #endif
 787 #if ENABLE_FEATURE_IFUPDOWN_IPV6
 788                                 &addr_inet6,
 789 #endif
 790                                 NULL
 791                         };
 792                         char *iface_name;
 793                         char *address_family_name;
 794                         char *method_name;
 795                         llist_t *iface_list;
 796
 797                         currif = xzalloc(sizeof(*currif));
 798                         iface_name = next_word(&rest_of_line);
 799                         address_family_name = next_word(&rest_of_line);
 800                         method_name = next_word(&rest_of_line);
 801
 802                         if (method_name == NULL)
 803                                 bb_error_msg_and_die("too few parameters for line \"%s\"", buf);
 804
 805                         /* ship any trailing whitespace */
 806                         rest_of_line = skip_whitespace(rest_of_line);
 807
 808                         if (rest_of_line[0] != '\0' /* && rest_of_line[0] != '#' */)
 809                                 bb_error_msg_and_die("too many parameters \"%s\"", buf);
 810
 811                         currif->iface = xstrdup(iface_name);
 812
 813                         currif->address_family = get_address_family(addr_fams, address_family_name);
 814                         if (!currif->address_family)
 815                                 bb_error_msg_and_die("unknown address type \"%s\"", address_family_name);
 816
 817                         currif->method = get_method(currif->address_family, method_name);
 818                         if (!currif->method)
 819                                 bb_error_msg_and_die("unknown method \"%s\"", method_name);
 820
 821                         for (iface_list = defn->ifaces; iface_list; iface_list = iface_list->link) {
 822                                 struct interface_defn_t *tmp = (struct interface_defn_t *) iface_list->data;
 823                                 if ((strcmp(tmp->iface, currif->iface) == 0)
 824                                  && (tmp->address_family == currif->address_family)
 825                                 ) {
 826                                         bb_error_msg_and_die("duplicate interface \"%s\"", tmp->iface);
 827                                 }
 828                         }
 829                         llist_add_to_end(&(defn->ifaces), (char*)currif);
 830
 831                         debug_noise("iface %s %s %s\n", currif->iface, address_family_name, method_name);
 832                         currently_processing = IFACE;
 833                 } else if (strcmp(first_word, "auto") == 0) {
 834                         while ((first_word = next_word(&rest_of_line)) != NULL) {
 835
 836                                 /* Check the interface isnt already listed */
 837                                 if (find_list_string(defn->autointerfaces, first_word)) {
 838                                         bb_perror_msg_and_die("interface declared auto twice \"%s\"", buf);
 839                                 }
 840
 841                                 /* Add the interface to the list */
 842                                 llist_add_to_end(&(defn->autointerfaces), xstrdup(first_word));
 843                                 debug_noise("\nauto %s\n", first_word);
 844                         }
 845                         currently_processing = NONE;
 846                 } else {
 847                         switch (currently_processing) {
 848                         case IFACE:
 849                                 if (rest_of_line[0] == '\0')
 850                                         bb_error_msg_and_die("option with empty value \"%s\"", buf);
 851
 852                                 if (strcmp(first_word, "up") != 0
 853                                  && strcmp(first_word, "down") != 0
 854                                  && strcmp(first_word, "pre-up") != 0
 855                                  && strcmp(first_word, "post-down") != 0
 856                                 ) {
 857                                         int i;
 858                                         for (i = 0; i < currif->n_options; i++) {
 859                                                 if (strcmp(currif->option[i].name, first_word) == 0)
 860                                                         bb_error_msg_and_die("duplicate option \"%s\"", buf);
 861                                         }
 862                                 }
 863                                 if (currif->n_options >= currif->max_options) {
 864                                         currif->max_options += 10;
 865                                         currif->option = xrealloc(currif->option,
 866                                                 sizeof(*currif->option) * currif->max_options);
 867                                 }
 868                                 debug_noise("\t%s=%s\n", first_word, rest_of_line);
 869                                 currif->option[currif->n_options].name = xstrdup(first_word);
 870                                 currif->option[currif->n_options].value = xstrdup(rest_of_line);
 871                                 currif->n_options++;
 872                                 break;
 873                         case MAPPING:
 874 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
 875                                 if (strcmp(first_word, "script") == 0) {
 876                                         if (currmap->script != NULL)
 877                                                 bb_error_msg_and_die("duplicate script in mapping \"%s\"", buf);
 878                                         currmap->script = xstrdup(next_word(&rest_of_line));
 879                                 } else if (strcmp(first_word, "map") == 0) {
 880                                         if (currmap->n_mappings >= currmap->max_mappings) {
 881                                                 currmap->max_mappings = currmap->max_mappings * 2 + 1;
 882                                                 currmap->mapping = xrealloc(currmap->mapping,
 883                                                         sizeof(char *) * currmap->max_mappings);
 884                                         }
 885                                         currmap->mapping[currmap->n_mappings] = xstrdup(next_word(&rest_of_line));
 886                                         currmap->n_mappings++;
 887                                 } else {
 888                                         bb_error_msg_and_die("misplaced option \"%s\"", buf);
 889                                 }
 890 #endif
 891                                 break;
 892                         case NONE:
 893                         default:
 894                                 bb_error_msg_and_die("misplaced option \"%s\"", buf);
 895                         }
 896                 }
 897                 free(buf);
 898         } /* while (fgets) */
 899
 900         if (ferror(f) != 0) {
 901                 /* ferror does NOT set errno! */
 902                 bb_error_msg_and_die("%s: I/O error", filename);
 903         }
 904         fclose(f);
 905
 906         return defn;
 907 }
 908
 909 static char *setlocalenv(const char *format, const char *name, const char *value)
 910 {
 911         char *result;
 912         char *here;
 913         char *there;
 914
 915         result = xasprintf(format, name, value);
 916
 917         for (here = there = result; *there != '=' && *there; there++) {
 918                 if (*there == '-')
 919                         *there = '_';
 920                 if (isalpha(*there))
 921                         *there = toupper(*there);
 922
 923                 if (isalnum(*there) || *there == '_') {
 924                         *here = *there;
 925                         here++;
 926                 }
 927         }
 928         memmove(here, there, strlen(there) + 1);
 929
 930         return result;
 931 }
 932
 933 static void set_environ(struct interface_defn_t *iface, const char *mode)
 934 {
 935         char **environend;
 936         int i;
 937         const int n_env_entries = iface->n_options + 5;
 938         char **ppch;
 939
 940         if (my_environ != NULL) {
 941                 for (ppch = my_environ; *ppch; ppch++) {
 942                         free(*ppch);
 943                         *ppch = NULL;
 944                 }
 945                 free(my_environ);
 946         }
 947         my_environ = xzalloc(sizeof(char *) * (n_env_entries + 1 /* for final NULL */ ));
 948         environend = my_environ;
 949
 950         for (i = 0; i < iface->n_options; i++) {
 951                 if (strcmp(iface->option[i].name, "up") == 0
 952                  || strcmp(iface->option[i].name, "down") == 0
 953                  || strcmp(iface->option[i].name, "pre-up") == 0
 954                  || strcmp(iface->option[i].name, "post-down") == 0
 955                 ) {
 956                         continue;
 957                 }
 958                 *(environend++) = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value);
 959         }
 960
 961         *(environend++) = setlocalenv("%s=%s", "IFACE", iface->iface);
 962         *(environend++) = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name);
 963         *(environend++) = setlocalenv("%s=%s", "METHOD", iface->method->name);
 964         *(environend++) = setlocalenv("%s=%s", "MODE", mode);
 965         *(environend++) = setlocalenv("%s=%s", "PATH", startup_PATH);
 966 }
 967
 968 static int doit(char *str)
 969 {
 970         if (option_mask32 & (OPT_no_act|OPT_verbose)) {
 971                 puts(str);
 972         }
 973         if (!(option_mask32 & OPT_no_act)) {
 974                 pid_t child;
 975                 int status;
 976
 977                 fflush(NULL);
 978                 child = vfork();
 979                 switch (child) {
 980                 case -1: /* failure */
 981                         return 0;
 982                 case 0: /* child */
 983                         execle(DEFAULT_SHELL, DEFAULT_SHELL, "-c", str, NULL, my_environ);
 984                         _exit(127);
 985                 }
 986                 safe_waitpid(child, &status, 0);
 987                 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
 988                         return 0;
 989                 }
 990         }
 991         return 1;
 992 }
 993
 994 static int execute_all(struct interface_defn_t *ifd, const char *opt)
 995 {
 996         int i;
 997         char *buf;
 998         for (i = 0; i < ifd->n_options; i++) {
 999                 if (strcmp(ifd->option[i].name, opt) == 0) {
1000                         if (!doit(ifd->option[i].value)) {
1001                                 return 0;
1002                         }
1003                 }
1004         }
1005
1006         buf = xasprintf("run-parts /etc/network/if-%s.d", opt);
1007         /* heh, we don't bother free'ing it */
1008         return doit(buf);
1009 }
1010
1011 static int check(char *str)
1012 {
1013         return str != NULL;
1014 }
1015
1016 static int iface_up(struct interface_defn_t *iface)
1017 {
1018         if (!iface->method->up(iface, check)) return -1;
1019         set_environ(iface, "start");
1020         if (!execute_all(iface, "pre-up")) return 0;
1021         if (!iface->method->up(iface, doit)) return 0;
1022         if (!execute_all(iface, "up")) return 0;
1023         return 1;
1024 }
1025
1026 static int iface_down(struct interface_defn_t *iface)
1027 {
1028         if (!iface->method->down(iface,check)) return -1;
1029         set_environ(iface, "stop");
1030         if (!execute_all(iface, "down")) return 0;
1031         if (!iface->method->down(iface, doit)) return 0;
1032         if (!execute_all(iface, "post-down")) return 0;
1033         return 1;
1034 }
1035
1036 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
1037 static int popen2(FILE **in, FILE **out, char *command, char *param)
1038 {
1039         char *argv[3] = { command, param, NULL };
1040         struct fd_pair infd, outfd;
1041         pid_t pid;
1042
1043         xpiped_pair(infd);
1044         xpiped_pair(outfd);
1045
1046         fflush(NULL);
1047         pid = vfork();
1048
1049         switch (pid) {
1050         case -1:  /* failure */
1051                 bb_perror_msg_and_die("vfork");
1052         case 0:  /* child */
1053                 /* NB: close _first_, then move fds! */
1054                 close(infd.wr);
1055                 close(outfd.rd);
1056                 xmove_fd(infd.rd, 0);
1057                 xmove_fd(outfd.wr, 1);
1058                 BB_EXECVP(command, argv);
1059                 _exit(127);
1060         }
1061         /* parent */
1062         close(infd.rd);
1063         close(outfd.wr);
1064         *in = fdopen(infd.wr, "w");
1065         *out = fdopen(outfd.rd, "r");
1066         return pid;
1067 }
1068
1069 static char *run_mapping(char *physical, struct mapping_defn_t *map)
1070 {
1071         FILE *in, *out;
1072         int i, status;
1073         pid_t pid;
1074
1075         char *logical = xstrdup(physical);
1076
1077         /* Run the mapping script. Never fails. */
1078         pid = popen2(&in, &out, map->script, physical);
1079
1080         /* Write mappings to stdin of mapping script. */
1081         for (i = 0; i < map->n_mappings; i++) {
1082                 fprintf(in, "%s\n", map->mapping[i]);
1083         }
1084         fclose(in);
1085         safe_waitpid(pid, &status, 0);
1086
1087         if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
1088                 /* If the mapping script exited successfully, try to
1089                  * grab a line of output and use that as the name of the
1090                  * logical interface. */
1091                 char *new_logical = xmalloc_fgetline(out);
1092
1093                 if (new_logical) {
1094                         /* If we are able to read a line of output from the script,
1095                          * remove any trailing whitespace and use this value
1096                          * as the name of the logical interface. */
1097                         char *pch = new_logical + strlen(new_logical) - 1;
1098
1099                         while (pch >= new_logical && isspace(*pch))
1100                                 *(pch--) = '\0';
1101
1102                         free(logical);
1103                         logical = new_logical;
1104                 }
1105         }
1106
1107         fclose(out);
1108
1109         return logical;
1110 }
1111 #endif /* FEATURE_IFUPDOWN_MAPPING */
1112
1113 static llist_t *find_iface_state(llist_t *state_list, const char *iface)
1114 {
1115         unsigned iface_len = strlen(iface);
1116         llist_t *search = state_list;
1117
1118         while (search) {
1119                 if ((strncmp(search->data, iface, iface_len) == 0)
1120                  && (search->data[iface_len] == '=')
1121                 ) {
1122                         return search;
1123                 }
1124                 search = search->link;
1125         }
1126         return NULL;
1127 }
1128
1129 /* read the previous state from the state file */
1130 static llist_t *read_iface_state(void)
1131 {
1132         llist_t *state_list = NULL;
1133         FILE *state_fp = fopen_for_read(CONFIG_IFUPDOWN_IFSTATE_PATH);
1134
1135         if (state_fp) {
1136                 char *start, *end_ptr;
1137                 while ((start = xmalloc_fgets(state_fp)) != NULL) {
1138                         /* We should only need to check for a single character */
1139                         end_ptr = start + strcspn(start, " \t\n");
1140                         *end_ptr = '\0';
1141                         llist_add_to(&state_list, start);
1142                 }
1143                 fclose(state_fp);
1144         }
1145         return state_list;
1146 }
1147
1148
1149 int ifupdown_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1150 int ifupdown_main(int argc, char **argv)
1151 {
1152         int (*cmds)(struct interface_defn_t *);
1153         struct interfaces_file_t *defn;
1154         llist_t *target_list = NULL;
1155         const char *interfaces = "/etc/network/interfaces";
1156         bool any_failures = 0;
1157
1158         cmds = iface_down;
1159         if (applet_name[2] == 'u') {
1160                 /* ifup command */
1161                 cmds = iface_up;
1162         }
1163
1164         getopt32(argv, OPTION_STR, &interfaces);
1165         if (argc - optind > 0) {
1166                 if (DO_ALL) bb_show_usage();
1167         } else {
1168                 if (!DO_ALL) bb_show_usage();
1169         }
1170
1171         debug_noise("reading %s file:\n", interfaces);
1172         defn = read_interfaces(interfaces);
1173         debug_noise("\ndone reading %s\n\n", interfaces);
1174
1175         startup_PATH = getenv("PATH");
1176         if (!startup_PATH) startup_PATH = "";
1177
1178         /* Create a list of interfaces to work on */
1179         if (DO_ALL) {
1180                 target_list = defn->autointerfaces;
1181         } else {
1182                 llist_add_to_end(&target_list, argv[optind]);
1183         }
1184
1185         /* Update the interfaces */
1186         while (target_list) {
1187                 llist_t *iface_list;
1188                 struct interface_defn_t *currif;
1189                 char *iface;
1190                 char *liface;
1191                 char *pch;
1192                 bool okay = 0;
1193                 int cmds_ret;
1194
1195                 iface = xstrdup(target_list->data);
1196                 target_list = target_list->link;
1197
1198                 pch = strchr(iface, '=');
1199                 if (pch) {
1200                         *pch = '\0';
1201                         liface = xstrdup(pch + 1);
1202                 } else {
1203                         liface = xstrdup(iface);
1204                 }
1205
1206                 if (!FORCE) {
1207                         llist_t *state_list = read_iface_state();
1208                         const llist_t *iface_state = find_iface_state(state_list, iface);
1209
1210                         if (cmds == iface_up) {
1211                                 /* ifup */
1212                                 if (iface_state) {
1213                                         bb_error_msg("interface %s already configured", iface);
1214                                         continue;
1215                                 }
1216                         } else {
1217                                 /* ifdown */
1218                                 if (!iface_state) {
1219                                         bb_error_msg("interface %s not configured", iface);
1220                                         continue;
1221                                 }
1222                         }
1223                         llist_free(state_list, free);
1224                 }
1225
1226 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
1227                 if ((cmds == iface_up) && !NO_MAPPINGS) {
1228                         struct mapping_defn_t *currmap;
1229
1230                         for (currmap = defn->mappings; currmap; currmap = currmap->next) {
1231                                 int i;
1232                                 for (i = 0; i < currmap->n_matches; i++) {
1233                                         if (fnmatch(currmap->match[i], liface, 0) != 0)
1234                                                 continue;
1235                                         if (VERBOSE) {
1236                                                 printf("Running mapping script %s on %s\n", currmap->script, liface);
1237                                         }
1238                                         liface = run_mapping(iface, currmap);
1239                                         break;
1240                                 }
1241                         }
1242                 }
1243 #endif
1244
1245                 iface_list = defn->ifaces;
1246                 while (iface_list) {
1247                         currif = (struct interface_defn_t *) iface_list->data;
1248                         if (strcmp(liface, currif->iface) == 0) {
1249                                 char *oldiface = currif->iface;
1250
1251                                 okay = 1;
1252                                 currif->iface = iface;
1253
1254                                 debug_noise("\nConfiguring interface %s (%s)\n", liface, currif->address_family->name);
1255
1256                                 /* Call the cmds function pointer, does either iface_up() or iface_down() */
1257                                 cmds_ret = cmds(currif);
1258                                 if (cmds_ret == -1) {
1259                                         bb_error_msg("don't seem to have all the variables for %s/%s",
1260                                                         liface, currif->address_family->name);
1261                                         any_failures = 1;
1262                                 } else if (cmds_ret == 0) {
1263                                         any_failures = 1;
1264                                 }
1265
1266                                 currif->iface = oldiface;
1267                         }
1268                         iface_list = iface_list->link;
1269                 }
1270                 if (VERBOSE) {
1271                         bb_putchar('\n');
1272                 }
1273
1274                 if (!okay && !FORCE) {
1275                         bb_error_msg("ignoring unknown interface %s", liface);
1276                         any_failures = 1;
1277                 } else if (!NO_ACT) {
1278                         /* update the state file */
1279                         FILE *state_fp;
1280                         llist_t *state;
1281                         llist_t *state_list = read_iface_state();
1282                         llist_t *iface_state = find_iface_state(state_list, iface);
1283
1284                         if (cmds == iface_up) {
1285                                 char * const newiface = xasprintf("%s=%s", iface, liface);
1286                                 if (iface_state == NULL) {
1287                                         llist_add_to_end(&state_list, newiface);
1288                                 } else {
1289                                         free(iface_state->data);
1290                                         iface_state->data = newiface;
1291                                 }
1292                         } else {
1293                                 /* Remove an interface from state_list */
1294                                 llist_unlink(&state_list, iface_state);
1295                                 free(llist_pop(&iface_state));
1296                         }
1297
1298                         /* Actually write the new state */
1299                         state_fp = xfopen_for_write(CONFIG_IFUPDOWN_IFSTATE_PATH);
1300                         state = state_list;
1301                         while (state) {
1302                                 if (state->data) {
1303                                         fprintf(state_fp, "%s\n", state->data);
1304                                 }
1305                                 state = state->link;
1306                         }
1307                         fclose(state_fp);
1308                         llist_free(state_list, free);
1309                 }
1310         }
1311
1312         return any_failures;
1313 }