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 GPLv2 or later, see file LICENSE in this source tree.
  18  */
  19
  20 //usage:#define ifup_trivial_usage
  21 //usage:       "[-an"IF_FEATURE_IFUPDOWN_MAPPING("m")"vf] [-i FILE] IFACE..."
  22 //usage:#define ifup_full_usage "\n\n"
  23 //usage:       "Options:"
  24 //usage:     "\n        -a      De/configure all interfaces automatically"
  25 //usage:     "\n        -i FILE Use FILE for interface definitions"
  26 //usage:     "\n        -n      Print out what would happen, but don't do it"
  27 //usage:        IF_FEATURE_IFUPDOWN_MAPPING(
  28 //usage:     "\n                (note: doesn't disable mappings)"
  29 //usage:     "\n        -m      Don't run any mappings"
  30 //usage:        )
  31 //usage:     "\n        -v      Print out what would happen before doing it"
  32 //usage:     "\n        -f      Force de/configuration"
  33 //usage:
  34 //usage:#define ifdown_trivial_usage
  35 //usage:       "[-an"IF_FEATURE_IFUPDOWN_MAPPING("m")"vf] [-i FILE] IFACE..."
  36 //usage:#define ifdown_full_usage "\n\n"
  37 //usage:       "Options:"
  38 //usage:     "\n        -a      De/configure all interfaces automatically"
  39 //usage:     "\n        -i FILE Use FILE for interface definitions"
  40 //usage:     "\n        -n      Print out what would happen, but don't do it"
  41 //usage:        IF_FEATURE_IFUPDOWN_MAPPING(
  42 //usage:     "\n                (note: doesn't disable mappings)"
  43 //usage:     "\n        -m      Don't run any mappings"
  44 //usage:        )
  45 //usage:     "\n        -v      Print out what would happen before doing it"
  46 //usage:     "\n        -f      Force de/configuration"
  47
  48 #include "libbb.h"
  49 /* After libbb.h, since it needs sys/types.h on some systems */
  50 #include <sys/utsname.h>
  51 #include <fnmatch.h>
  52
  53 #define MAX_OPT_DEPTH 10
  54 #define EUNBALBRACK 10001
  55 #define EUNDEFVAR   10002
  56 #define EUNBALPER   10000
  57
  58 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
  59 #define MAX_INTERFACE_LENGTH 10
  60 #endif
  61
  62 #define UDHCPC_CMD_OPTIONS CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS
  63
  64 #define debug_noise(args...) /*fprintf(stderr, args)*/
  65
  66 /* Forward declaration */
  67 struct interface_defn_t;
  68
  69 typedef int execfn(char *command);
  70
  71 struct method_t {
  72         const char *name;
  73         int (*up)(struct interface_defn_t *ifd, execfn *e) FAST_FUNC;
  74         int (*down)(struct interface_defn_t *ifd, execfn *e) FAST_FUNC;
  75 };
  76
  77 struct address_family_t {
  78         const char *name;
  79         int n_methods;
  80         const struct method_t *method;
  81 };
  82
  83 struct mapping_defn_t {
  84         struct mapping_defn_t *next;
  85
  86         int max_matches;
  87         int n_matches;
  88         char **match;
  89
  90         char *script;
  91
  92         int max_mappings;
  93         int n_mappings;
  94         char **mapping;
  95 };
  96
  97 struct variable_t {
  98         char *name;
  99         char *value;
 100 };
 101
 102 struct interface_defn_t {
 103         const struct address_family_t *address_family;
 104         const struct method_t *method;
 105
 106         char *iface;
 107         int max_options;
 108         int n_options;
 109         struct variable_t *option;
 110 };
 111
 112 struct interfaces_file_t {
 113         llist_t *autointerfaces;
 114         llist_t *ifaces;
 115         struct mapping_defn_t *mappings;
 116 };
 117
 118
 119 #define OPTION_STR "anvf" IF_FEATURE_IFUPDOWN_MAPPING("m") "i:"
 120 enum {
 121         OPT_do_all      = 0x1,
 122         OPT_no_act      = 0x2,
 123         OPT_verbose     = 0x4,
 124         OPT_force       = 0x8,
 125         OPT_no_mappings = 0x10,
 126 };
 127 #define DO_ALL      (option_mask32 & OPT_do_all)
 128 #define NO_ACT      (option_mask32 & OPT_no_act)
 129 #define VERBOSE     (option_mask32 & OPT_verbose)
 130 #define FORCE       (option_mask32 & OPT_force)
 131 #define NO_MAPPINGS (option_mask32 & OPT_no_mappings)
 132
 133
 134 struct globals {
 135         char **my_environ;
 136         const char *startup_PATH;
 137         char *shell;
 138 } FIX_ALIASING;
 139 #define G (*(struct globals*)&bb_common_bufsiz1)
 140 #define INIT_G() do { } while (0)
 141
 142
 143 #if ENABLE_FEATURE_IFUPDOWN_IPV4 || ENABLE_FEATURE_IFUPDOWN_IPV6
 144
 145 static void addstr(char **bufp, const char *str, size_t str_length)
 146 {
 147         /* xasprintf trick will be smaller, but we are often
 148          * called with str_length == 1 - don't want to have
 149          * THAT much of malloc/freeing! */
 150         char *buf = *bufp;
 151         int len = (buf ? strlen(buf) : 0);
 152         str_length++;
 153         buf = xrealloc(buf, len + str_length);
 154         /* copies at most str_length-1 chars! */
 155         safe_strncpy(buf + len, str, str_length);
 156         *bufp = buf;
 157 }
 158
 159 static int strncmpz(const char *l, const char *r, size_t llen)
 160 {
 161         int i = strncmp(l, r, llen);
 162
 163         if (i == 0)
 164                 return - (unsigned char)r[llen];
 165         return i;
 166 }
 167
 168 static char *get_var(const char *id, size_t idlen, struct interface_defn_t *ifd)
 169 {
 170         int i;
 171
 172         if (strncmpz(id, "iface", idlen) == 0) {
 173                 // ubuntu's ifup doesn't do this:
 174                 //static char *label_buf;
 175                 //char *result;
 176                 //free(label_buf);
 177                 //label_buf = xstrdup(ifd->iface);
 178                 // Remove virtual iface suffix
 179                 //result = strchrnul(label_buf, ':');
 180                 //*result = '\0';
 181                 //return label_buf;
 182
 183                 return ifd->iface;
 184         }
 185         if (strncmpz(id, "label", idlen) == 0) {
 186                 return ifd->iface;
 187         }
 188         for (i = 0; i < ifd->n_options; i++) {
 189                 if (strncmpz(id, ifd->option[i].name, idlen) == 0) {
 190                         return ifd->option[i].value;
 191                 }
 192         }
 193         return NULL;
 194 }
 195
 196 # if ENABLE_FEATURE_IFUPDOWN_IP
 197 static int count_netmask_bits(const char *dotted_quad)
 198 {
 199 //      int result;
 200 //      unsigned a, b, c, d;
 201 //      /* Found a netmask...  Check if it is dotted quad */
 202 //      if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) != 4)
 203 //              return -1;
 204 //      if ((a|b|c|d) >> 8)
 205 //              return -1; /* one of numbers is >= 256 */
 206 //      d |= (a << 24) | (b << 16) | (c << 8); /* IP */
 207 //      d = ~d; /* 11110000 -> 00001111 */
 208
 209         /* Shorter version */
 210         int result;
 211         struct in_addr ip;
 212         unsigned d;
 213
 214         if (inet_aton(dotted_quad, &ip) == 0)
 215                 return -1; /* malformed dotted IP */
 216         d = ntohl(ip.s_addr); /* IP in host order */
 217         d = ~d; /* 11110000 -> 00001111 */
 218         if (d & (d+1)) /* check that it is in 00001111 form */
 219                 return -1; /* no it is not */
 220         result = 32;
 221         while (d) {
 222                 d >>= 1;
 223                 result--;
 224         }
 225         return result;
 226 }
 227 # endif
 228
 229 static char *parse(const char *command, struct interface_defn_t *ifd)
 230 {
 231         size_t old_pos[MAX_OPT_DEPTH] = { 0 };
 232         int okay[MAX_OPT_DEPTH] = { 1 };
 233         int opt_depth = 1;
 234         char *result = NULL;
 235
 236         while (*command) {
 237                 switch (*command) {
 238                 default:
 239                         addstr(&result, command, 1);
 240                         command++;
 241                         break;
 242                 case '\\':
 243                         if (command[1]) {
 244                                 addstr(&result, command + 1, 1);
 245                                 command += 2;
 246                         } else {
 247                                 addstr(&result, command, 1);
 248                                 command++;
 249                         }
 250                         break;
 251                 case '[':
 252                         if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) {
 253                                 old_pos[opt_depth] = result ? strlen(result) : 0;
 254                                 okay[opt_depth] = 1;
 255                                 opt_depth++;
 256                                 command += 2;
 257                         } else {
 258                                 addstr(&result, "[", 1);
 259                                 command++;
 260                         }
 261                         break;
 262                 case ']':
 263                         if (command[1] == ']' && opt_depth > 1) {
 264                                 opt_depth--;
 265                                 if (!okay[opt_depth]) {
 266                                         result[old_pos[opt_depth]] = '\0';
 267                                 }
 268                                 command += 2;
 269                         } else {
 270                                 addstr(&result, "]", 1);
 271                                 command++;
 272                         }
 273                         break;
 274                 case '%':
 275                         {
 276                                 char *nextpercent;
 277                                 char *varvalue;
 278
 279                                 command++;
 280                                 nextpercent = strchr(command, '%');
 281                                 if (!nextpercent) {
 282                                         errno = EUNBALPER;
 283                                         free(result);
 284                                         return NULL;
 285                                 }
 286
 287                                 varvalue = get_var(command, nextpercent - command, ifd);
 288
 289                                 if (varvalue) {
 290 # if ENABLE_FEATURE_IFUPDOWN_IP
 291                                         /* "hwaddress <class> <address>":
 292                                          * unlike ifconfig, ip doesnt want <class>
 293                                          * (usually "ether" keyword). Skip it. */
 294                                         if (strncmp(command, "hwaddress", 9) == 0) {
 295                                                 varvalue = skip_whitespace(skip_non_whitespace(varvalue));
 296                                         }
 297 # endif
 298                                         addstr(&result, varvalue, strlen(varvalue));
 299                                 } else {
 300 # if ENABLE_FEATURE_IFUPDOWN_IP
 301                                         /* Sigh...  Add a special case for 'ip' to convert from
 302                                          * dotted quad to bit count style netmasks.  */
 303                                         if (strncmp(command, "bnmask", 6) == 0) {
 304                                                 unsigned res;
 305                                                 varvalue = get_var("netmask", 7, ifd);
 306                                                 if (varvalue) {
 307                                                         res = count_netmask_bits(varvalue);
 308                                                         if (res > 0) {
 309                                                                 const char *argument = utoa(res);
 310                                                                 addstr(&result, argument, strlen(argument));
 311                                                                 command = nextpercent + 1;
 312                                                                 break;
 313                                                         }
 314                                                 }
 315                                         }
 316 # endif
 317                                         okay[opt_depth - 1] = 0;
 318                                 }
 319
 320                                 command = nextpercent + 1;
 321                         }
 322                         break;
 323                 }
 324         }
 325
 326         if (opt_depth > 1) {
 327                 errno = EUNBALBRACK;
 328                 free(result);
 329                 return NULL;
 330         }
 331
 332         if (!okay[0]) {
 333                 errno = EUNDEFVAR;
 334                 free(result);
 335                 return NULL;
 336         }
 337
 338         return result;
 339 }
 340
 341 /* execute() returns 1 for success and 0 for failure */
 342 static int execute(const char *command, struct interface_defn_t *ifd, execfn *exec)
 343 {
 344         char *out;
 345         int ret;
 346
 347         out = parse(command, ifd);
 348         if (!out) {
 349                 /* parse error? */
 350                 return 0;
 351         }
 352         /* out == "": parsed ok but not all needed variables known, skip */
 353         ret = out[0] ? (*exec)(out) : 1;
 354
 355         free(out);
 356         if (ret != 1) {
 357                 return 0;
 358         }
 359         return 1;
 360 }
 361
 362 #endif /* FEATURE_IFUPDOWN_IPV4 || FEATURE_IFUPDOWN_IPV6 */
 363
 364
 365 #if ENABLE_FEATURE_IFUPDOWN_IPV6
 366
 367 static int FAST_FUNC loopback_up6(struct interface_defn_t *ifd, execfn *exec)
 368 {
 369 # if ENABLE_FEATURE_IFUPDOWN_IP
 370         int result;
 371         result = execute("ip addr add ::1 dev %iface%", ifd, exec);
 372         result += execute("ip link set %iface% up", ifd, exec);
 373         return ((result == 2) ? 2 : 0);
 374 # else
 375         return execute("ifconfig %iface% add ::1", ifd, exec);
 376 # endif
 377 }
 378
 379 static int FAST_FUNC loopback_down6(struct interface_defn_t *ifd, execfn *exec)
 380 {
 381 # if ENABLE_FEATURE_IFUPDOWN_IP
 382         return execute("ip link set %iface% down", ifd, exec);
 383 # else
 384         return execute("ifconfig %iface% del ::1", ifd, exec);
 385 # endif
 386 }
 387
 388 static int FAST_FUNC manual_up_down6(struct interface_defn_t *ifd UNUSED_PARAM, execfn *exec UNUSED_PARAM)
 389 {
 390         return 1;
 391 }
 392
 393 static int FAST_FUNC static_up6(struct interface_defn_t *ifd, execfn *exec)
 394 {
 395         int result;
 396 # if ENABLE_FEATURE_IFUPDOWN_IP
 397         result = execute("ip addr add %address%/%netmask% dev %iface%[[ label %label%]]", ifd, exec);
 398         result += execute("ip link set[[ mtu %mtu%]][[ addr %hwaddress%]] %iface% up", ifd, exec);
 399         /* Was: "[[ ip ....%gateway% ]]". Removed extra spaces w/o checking */
 400         result += execute("[[ip route add ::/0 via %gateway%]]", ifd, exec);
 401 # else
 402         result = execute("ifconfig %iface%[[ media %media%]][[ hw %hwaddress%]][[ mtu %mtu%]] up", ifd, exec);
 403         result += execute("ifconfig %iface% add %address%/%netmask%", ifd, exec);
 404         result += execute("[[route -A inet6 add ::/0 gw %gateway%]]", ifd, exec);
 405 # endif
 406         return ((result == 3) ? 3 : 0);
 407 }
 408
 409 static int FAST_FUNC static_down6(struct interface_defn_t *ifd, execfn *exec)
 410 {
 411 # if ENABLE_FEATURE_IFUPDOWN_IP
 412         return execute("ip link set %iface% down", ifd, exec);
 413 # else
 414         return execute("ifconfig %iface% down", ifd, exec);
 415 # endif
 416 }
 417
 418 # if ENABLE_FEATURE_IFUPDOWN_IP
 419 static int FAST_FUNC v4tunnel_up(struct interface_defn_t *ifd, execfn *exec)
 420 {
 421         int result;
 422         result = execute("ip tunnel add %iface% mode sit remote "
 423                         "%endpoint%[[ local %local%]][[ ttl %ttl%]]", ifd, exec);
 424         result += execute("ip link set %iface% up", ifd, exec);
 425         result += execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec);
 426         result += execute("[[ip route add ::/0 via %gateway%]]", ifd, exec);
 427         return ((result == 4) ? 4 : 0);
 428 }
 429
 430 static int FAST_FUNC v4tunnel_down(struct interface_defn_t * ifd, execfn * exec)
 431 {
 432         return execute("ip tunnel del %iface%", ifd, exec);
 433 }
 434 # endif
 435
 436 static const struct method_t methods6[] = {
 437 # if ENABLE_FEATURE_IFUPDOWN_IP
 438         { "v4tunnel" , v4tunnel_up     , v4tunnel_down   , },
 439 # endif
 440         { "static"   , static_up6      , static_down6    , },
 441         { "manual"   , manual_up_down6 , manual_up_down6 , },
 442         { "loopback" , loopback_up6    , loopback_down6  , },
 443 };
 444
 445 static const struct address_family_t addr_inet6 = {
 446         "inet6",
 447         ARRAY_SIZE(methods6),
 448         methods6
 449 };
 450
 451 #endif /* FEATURE_IFUPDOWN_IPV6 */
 452
 453
 454 #if ENABLE_FEATURE_IFUPDOWN_IPV4
 455
 456 static int FAST_FUNC loopback_up(struct interface_defn_t *ifd, execfn *exec)
 457 {
 458 # if ENABLE_FEATURE_IFUPDOWN_IP
 459         int result;
 460         result = execute("ip addr add 127.0.0.1/8 dev %iface%", ifd, exec);
 461         result += execute("ip link set %iface% up", ifd, exec);
 462         return ((result == 2) ? 2 : 0);
 463 # else
 464         return execute("ifconfig %iface% 127.0.0.1 up", ifd, exec);
 465 # endif
 466 }
 467
 468 static int FAST_FUNC loopback_down(struct interface_defn_t *ifd, execfn *exec)
 469 {
 470 # if ENABLE_FEATURE_IFUPDOWN_IP
 471         int result;
 472         result = execute("ip addr flush dev %iface%", ifd, exec);
 473         result += execute("ip link set %iface% down", ifd, exec);
 474         return ((result == 2) ? 2 : 0);
 475 # else
 476         return execute("ifconfig %iface% 127.0.0.1 down", ifd, exec);
 477 # endif
 478 }
 479
 480 static int FAST_FUNC static_up(struct interface_defn_t *ifd, execfn *exec)
 481 {
 482         int result;
 483 # if ENABLE_FEATURE_IFUPDOWN_IP
 484         result = execute("ip addr add %address%/%bnmask%[[ broadcast %broadcast%]] "
 485                         "dev %iface%[[ peer %pointopoint%]][[ label %label%]]", ifd, exec);
 486         result += execute("ip link set[[ mtu %mtu%]][[ addr %hwaddress%]] %iface% up", ifd, exec);
 487         result += execute("[[ip route add default via %gateway% dev %iface%]]", ifd, exec);
 488         return ((result == 3) ? 3 : 0);
 489 # else
 490         /* ifconfig said to set iface up before it processes hw %hwaddress%,
 491          * which then of course fails. Thus we run two separate ifconfig */
 492         result = execute("ifconfig %iface%[[ hw %hwaddress%]][[ media %media%]][[ mtu %mtu%]] up",
 493                                 ifd, exec);
 494         result += execute("ifconfig %iface% %address% netmask %netmask%"
 495                                 "[[ broadcast %broadcast%]][[ pointopoint %pointopoint%]] ",
 496                                 ifd, exec);
 497         result += execute("[[route add default gw %gateway% %iface%]]", ifd, exec);
 498         return ((result == 3) ? 3 : 0);
 499 # endif
 500 }
 501
 502 static int FAST_FUNC static_down(struct interface_defn_t *ifd, execfn *exec)
 503 {
 504         int result;
 505 # if ENABLE_FEATURE_IFUPDOWN_IP
 506         result = execute("ip addr flush dev %iface%", ifd, exec);
 507         result += execute("ip link set %iface% down", ifd, exec);
 508 # else
 509         /* result = execute("[[route del default gw %gateway% %iface%]]", ifd, exec); */
 510         /* Bringing the interface down deletes the routes in itself.
 511            Otherwise this fails if we reference 'gateway' when using this from dhcp_down */
 512         result = 1;
 513         result += execute("ifconfig %iface% down", ifd, exec);
 514 # endif
 515         return ((result == 2) ? 2 : 0);
 516 }
 517
 518 # if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
 519 struct dhcp_client_t {
 520         const char *name;
 521         const char *startcmd;
 522         const char *stopcmd;
 523 };
 524
 525 static const struct dhcp_client_t ext_dhcp_clients[] = {
 526         { "dhcpcd",
 527                 "dhcpcd[[ -h %hostname%]][[ -i %vendor%]][[ -I %client%]][[ -l %leasetime%]] %iface%",
 528                 "dhcpcd -k %iface%",
 529         },
 530         { "dhclient",
 531                 "dhclient -pf /var/run/dhclient.%iface%.pid %iface%",
 532                 "kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null",
 533         },
 534         { "pump",
 535                 "pump -i %iface%[[ -h %hostname%]][[ -l %leasehours%]]",
 536                 "pump -i %iface% -k",
 537         },
 538         { "udhcpc",
 539                 "udhcpc " UDHCPC_CMD_OPTIONS " -p /var/run/udhcpc.%iface%.pid -i %iface%[[ -H %hostname%]][[ -c %client%]]"
 540                                 "[[ -s %script%]][[ %udhcpc_opts%]]",
 541                 "kill `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
 542         },
 543 };
 544 # endif /* FEATURE_IFUPDOWN_EXTERNAL_DHCPC */
 545
 546 # if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
 547 static int FAST_FUNC dhcp_up(struct interface_defn_t *ifd, execfn *exec)
 548 {
 549         unsigned i;
 550 #  if ENABLE_FEATURE_IFUPDOWN_IP
 551         /* ip doesn't up iface when it configures it (unlike ifconfig) */
 552         if (!execute("ip link set[[ addr %hwaddress%]] %iface% up", ifd, exec))
 553                 return 0;
 554 #  else
 555         /* needed if we have hwaddress on dhcp iface */
 556         if (!execute("ifconfig %iface%[[ hw %hwaddress%]] up", ifd, exec))
 557                 return 0;
 558 #  endif
 559         for (i = 0; i < ARRAY_SIZE(ext_dhcp_clients); i++) {
 560                 if (exists_execable(ext_dhcp_clients[i].name))
 561                         return execute(ext_dhcp_clients[i].startcmd, ifd, exec);
 562         }
 563         bb_error_msg("no dhcp clients found");
 564         return 0;
 565 }
 566 # elif ENABLE_UDHCPC
 567 static int FAST_FUNC dhcp_up(struct interface_defn_t *ifd, execfn *exec)
 568 {
 569 #  if ENABLE_FEATURE_IFUPDOWN_IP
 570         /* ip doesn't up iface when it configures it (unlike ifconfig) */
 571         if (!execute("ip link set[[ addr %hwaddress%]] %iface% up", ifd, exec))
 572                 return 0;
 573 #  else
 574         /* needed if we have hwaddress on dhcp iface */
 575         if (!execute("ifconfig %iface%[[ hw %hwaddress%]] up", ifd, exec))
 576                 return 0;
 577 #  endif
 578         return execute("udhcpc " UDHCPC_CMD_OPTIONS " -p /var/run/udhcpc.%iface%.pid "
 579                         "-i %iface%[[ -H %hostname%]][[ -c %client%]][[ -s %script%]][[ %udhcpc_opts%]]",
 580                         ifd, exec);
 581 }
 582 # else
 583 static int FAST_FUNC dhcp_up(struct interface_defn_t *ifd UNUSED_PARAM,
 584                 execfn *exec UNUSED_PARAM)
 585 {
 586         return 0; /* no dhcp support */
 587 }
 588 # endif
 589
 590 # if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
 591 static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd, execfn *exec)
 592 {
 593         int result = 0;
 594         unsigned i;
 595
 596         for (i = 0; i < ARRAY_SIZE(ext_dhcp_clients); i++) {
 597                 if (exists_execable(ext_dhcp_clients[i].name)) {
 598                         result = execute(ext_dhcp_clients[i].stopcmd, ifd, exec);
 599                         if (result)
 600                                 break;
 601                 }
 602         }
 603
 604         if (!result)
 605                 bb_error_msg("warning: no dhcp clients found and stopped");
 606
 607         /* Sleep a bit, otherwise static_down tries to bring down interface too soon,
 608            and it may come back up because udhcpc is still shutting down */
 609         usleep(100000);
 610         result += static_down(ifd, exec);
 611         return ((result == 3) ? 3 : 0);
 612 }
 613 # elif ENABLE_UDHCPC
 614 static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd, execfn *exec)
 615 {
 616         int result;
 617         result = execute(
 618                 "test -f /var/run/udhcpc.%iface%.pid && "
 619                 "kill `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
 620                 ifd, exec);
 621         /* Also bring the hardware interface down since
 622            killing the dhcp client alone doesn't do it.
 623            This enables consecutive ifup->ifdown->ifup */
 624         /* Sleep a bit, otherwise static_down tries to bring down interface too soon,
 625            and it may come back up because udhcpc is still shutting down */
 626         usleep(100000);
 627         result += static_down(ifd, exec);
 628         return ((result == 3) ? 3 : 0);
 629 }
 630 # else
 631 static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd UNUSED_PARAM,
 632                 execfn *exec UNUSED_PARAM)
 633 {
 634         return 0; /* no dhcp support */
 635 }
 636 # endif
 637
 638 static int FAST_FUNC manual_up_down(struct interface_defn_t *ifd UNUSED_PARAM, execfn *exec UNUSED_PARAM)
 639 {
 640         return 1;
 641 }
 642
 643 static int FAST_FUNC bootp_up(struct interface_defn_t *ifd, execfn *exec)
 644 {
 645         return execute("bootpc[[ --bootfile %bootfile%]] --dev %iface%"
 646                         "[[ --server %server%]][[ --hwaddr %hwaddr%]]"
 647                         " --returniffail --serverbcast", ifd, exec);
 648 }
 649
 650 static int FAST_FUNC ppp_up(struct interface_defn_t *ifd, execfn *exec)
 651 {
 652         return execute("pon[[ %provider%]]", ifd, exec);
 653 }
 654
 655 static int FAST_FUNC ppp_down(struct interface_defn_t *ifd, execfn *exec)
 656 {
 657         return execute("poff[[ %provider%]]", ifd, exec);
 658 }
 659
 660 static int FAST_FUNC wvdial_up(struct interface_defn_t *ifd, execfn *exec)
 661 {
 662         return execute("start-stop-daemon --start -x wvdial "
 663                 "-p /var/run/wvdial.%iface% -b -m --[[ %provider%]]", ifd, exec);
 664 }
 665
 666 static int FAST_FUNC wvdial_down(struct interface_defn_t *ifd, execfn *exec)
 667 {
 668         return execute("start-stop-daemon --stop -x wvdial "
 669                         "-p /var/run/wvdial.%iface% -s 2", ifd, exec);
 670 }
 671
 672 static const struct method_t methods[] = {
 673         { "manual"  , manual_up_down, manual_up_down, },
 674         { "wvdial"  , wvdial_up     , wvdial_down   , },
 675         { "ppp"     , ppp_up        , ppp_down      , },
 676         { "static"  , static_up     , static_down   , },
 677         { "bootp"   , bootp_up      , static_down   , },
 678         { "dhcp"    , dhcp_up       , dhcp_down     , },
 679         { "loopback", loopback_up   , loopback_down , },
 680 };
 681
 682 static const struct address_family_t addr_inet = {
 683         "inet",
 684         ARRAY_SIZE(methods),
 685         methods
 686 };
 687
 688 #endif  /* FEATURE_IFUPDOWN_IPV4 */
 689
 690
 691 /* Returns pointer to the next word, or NULL.
 692  * In 1st case, advances *buf to the word after this one.
 693  */
 694 static char *next_word(char **buf)
 695 {
 696         unsigned length;
 697         char *word;
 698
 699         /* Skip over leading whitespace */
 700         word = skip_whitespace(*buf);
 701
 702         /* Stop on EOL */
 703         if (*word == '\0')
 704                 return NULL;
 705
 706         /* Find the length of this word (can't be 0) */
 707         length = strcspn(word, " \t\n");
 708
 709         /* Unless we are already at NUL, store NUL and advance */
 710         if (word[length] != '\0')
 711                 word[length++] = '\0';
 712
 713         *buf = skip_whitespace(word + length);
 714
 715         return word;
 716 }
 717
 718 static const struct address_family_t *get_address_family(const struct address_family_t *const af[], char *name)
 719 {
 720         int i;
 721
 722         if (!name)
 723                 return NULL;
 724
 725         for (i = 0; af[i]; i++) {
 726                 if (strcmp(af[i]->name, name) == 0) {
 727                         return af[i];
 728                 }
 729         }
 730         return NULL;
 731 }
 732
 733 static const struct method_t *get_method(const struct address_family_t *af, char *name)
 734 {
 735         int i;
 736
 737         if (!name)
 738                 return NULL;
 739         /* TODO: use index_in_str_array() */
 740         for (i = 0; i < af->n_methods; i++) {
 741                 if (strcmp(af->method[i].name, name) == 0) {
 742                         return &af->method[i];
 743                 }
 744         }
 745         return NULL;
 746 }
 747
 748 static struct interfaces_file_t *read_interfaces(const char *filename)
 749 {
 750         /* Let's try to be compatible.
 751          *
 752          * "man 5 interfaces" says:
 753          * Lines starting with "#" are ignored. Note that end-of-line
 754          * comments are NOT supported, comments must be on a line of their own.
 755          * A line may be extended across multiple lines by making
 756          * the last character a backslash.
 757          *
 758          * Seen elsewhere in example config file:
 759          * A first non-blank "#" character makes the rest of the line
 760          * be ignored. Blank lines are ignored. Lines may be indented freely.
 761          * A "\" character at the very end of the line indicates the next line
 762          * should be treated as a continuation of the current one.
 763          */
 764 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
 765         struct mapping_defn_t *currmap = NULL;
 766 #endif
 767         struct interface_defn_t *currif = NULL;
 768         struct interfaces_file_t *defn;
 769         FILE *f;
 770         char *buf;
 771         char *first_word;
 772         char *rest_of_line;
 773         enum { NONE, IFACE, MAPPING } currently_processing = NONE;
 774
 775         defn = xzalloc(sizeof(*defn));
 776         f = xfopen_for_read(filename);
 777
 778         while ((buf = xmalloc_fgetline(f)) != NULL) {
 779 #if ENABLE_DESKTOP
 780                 /* Trailing "\" concatenates lines */
 781                 char *p;
 782                 while ((p = last_char_is(buf, '\\')) != NULL) {
 783                         *p = '\0';
 784                         rest_of_line = xmalloc_fgetline(f);
 785                         if (!rest_of_line)
 786                                 break;
 787                         p = xasprintf("%s%s", buf, rest_of_line);
 788                         free(buf);
 789                         free(rest_of_line);
 790                         buf = p;
 791                 }
 792 #endif
 793                 rest_of_line = buf;
 794                 first_word = next_word(&rest_of_line);
 795                 if (!first_word || *first_word == '#') {
 796                         free(buf);
 797                         continue; /* blank/comment line */
 798                 }
 799
 800                 if (strcmp(first_word, "mapping") == 0) {
 801 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
 802                         currmap = xzalloc(sizeof(*currmap));
 803
 804                         while ((first_word = next_word(&rest_of_line)) != NULL) {
 805                                 currmap->match = xrealloc_vector(currmap->match, 4, currmap->n_matches);
 806                                 currmap->match[currmap->n_matches++] = xstrdup(first_word);
 807                         }
 808                         /*currmap->max_mappings = 0; - done by xzalloc */
 809                         /*currmap->n_mappings = 0;*/
 810                         /*currmap->mapping = NULL;*/
 811                         /*currmap->script = NULL;*/
 812                         {
 813                                 struct mapping_defn_t **where = &defn->mappings;
 814                                 while (*where != NULL) {
 815                                         where = &(*where)->next;
 816                                 }
 817                                 *where = currmap;
 818                                 /*currmap->next = NULL;*/
 819                         }
 820                         debug_noise("Added mapping\n");
 821 #endif
 822                         currently_processing = MAPPING;
 823                 } else if (strcmp(first_word, "iface") == 0) {
 824                         static const struct address_family_t *const addr_fams[] = {
 825 #if ENABLE_FEATURE_IFUPDOWN_IPV4
 826                                 &addr_inet,
 827 #endif
 828 #if ENABLE_FEATURE_IFUPDOWN_IPV6
 829                                 &addr_inet6,
 830 #endif
 831                                 NULL
 832                         };
 833                         char *iface_name;
 834                         char *address_family_name;
 835                         char *method_name;
 836                         llist_t *iface_list;
 837
 838                         currif = xzalloc(sizeof(*currif));
 839                         iface_name = next_word(&rest_of_line);
 840                         address_family_name = next_word(&rest_of_line);
 841                         method_name = next_word(&rest_of_line);
 842
 843                         if (method_name == NULL)
 844                                 bb_error_msg_and_die("too few parameters for line \"%s\"", buf);
 845
 846                         /* ship any trailing whitespace */
 847                         rest_of_line = skip_whitespace(rest_of_line);
 848
 849                         if (rest_of_line[0] != '\0' /* && rest_of_line[0] != '#' */)
 850                                 bb_error_msg_and_die("too many parameters \"%s\"", buf);
 851
 852                         currif->iface = xstrdup(iface_name);
 853
 854                         currif->address_family = get_address_family(addr_fams, address_family_name);
 855                         if (!currif->address_family)
 856                                 bb_error_msg_and_die("unknown address type \"%s\"", address_family_name);
 857
 858                         currif->method = get_method(currif->address_family, method_name);
 859                         if (!currif->method)
 860                                 bb_error_msg_and_die("unknown method \"%s\"", method_name);
 861
 862                         for (iface_list = defn->ifaces; iface_list; iface_list = iface_list->link) {
 863                                 struct interface_defn_t *tmp = (struct interface_defn_t *) iface_list->data;
 864                                 if ((strcmp(tmp->iface, currif->iface) == 0)
 865                                  && (tmp->address_family == currif->address_family)
 866                                 ) {
 867                                         bb_error_msg_and_die("duplicate interface \"%s\"", tmp->iface);
 868                                 }
 869                         }
 870                         llist_add_to_end(&(defn->ifaces), (char*)currif);
 871
 872                         debug_noise("iface %s %s %s\n", currif->iface, address_family_name, method_name);
 873                         currently_processing = IFACE;
 874                 } else if (strcmp(first_word, "auto") == 0) {
 875                         while ((first_word = next_word(&rest_of_line)) != NULL) {
 876
 877                                 /* Check the interface isnt already listed */
 878                                 if (llist_find_str(defn->autointerfaces, first_word)) {
 879                                         bb_perror_msg_and_die("interface declared auto twice \"%s\"", buf);
 880                                 }
 881
 882                                 /* Add the interface to the list */
 883                                 llist_add_to_end(&(defn->autointerfaces), xstrdup(first_word));
 884                                 debug_noise("\nauto %s\n", first_word);
 885                         }
 886                         currently_processing = NONE;
 887                 } else {
 888                         switch (currently_processing) {
 889                         case IFACE:
 890                                 if (rest_of_line[0] == '\0')
 891                                         bb_error_msg_and_die("option with empty value \"%s\"", buf);
 892
 893                                 if (strcmp(first_word, "up") != 0
 894                                  && strcmp(first_word, "down") != 0
 895                                  && strcmp(first_word, "pre-up") != 0
 896                                  && strcmp(first_word, "post-down") != 0
 897                                 ) {
 898                                         int i;
 899                                         for (i = 0; i < currif->n_options; i++) {
 900                                                 if (strcmp(currif->option[i].name, first_word) == 0)
 901                                                         bb_error_msg_and_die("duplicate option \"%s\"", buf);
 902                                         }
 903                                 }
 904                                 if (currif->n_options >= currif->max_options) {
 905                                         currif->max_options += 10;
 906                                         currif->option = xrealloc(currif->option,
 907                                                 sizeof(*currif->option) * currif->max_options);
 908                                 }
 909                                 debug_noise("\t%s=%s\n", first_word, rest_of_line);
 910                                 currif->option[currif->n_options].name = xstrdup(first_word);
 911                                 currif->option[currif->n_options].value = xstrdup(rest_of_line);
 912                                 currif->n_options++;
 913                                 break;
 914                         case MAPPING:
 915 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
 916                                 if (strcmp(first_word, "script") == 0) {
 917                                         if (currmap->script != NULL)
 918                                                 bb_error_msg_and_die("duplicate script in mapping \"%s\"", buf);
 919                                         currmap->script = xstrdup(next_word(&rest_of_line));
 920                                 } else if (strcmp(first_word, "map") == 0) {
 921                                         if (currmap->n_mappings >= currmap->max_mappings) {
 922                                                 currmap->max_mappings = currmap->max_mappings * 2 + 1;
 923                                                 currmap->mapping = xrealloc(currmap->mapping,
 924                                                         sizeof(char *) * currmap->max_mappings);
 925                                         }
 926                                         currmap->mapping[currmap->n_mappings] = xstrdup(next_word(&rest_of_line));
 927                                         currmap->n_mappings++;
 928                                 } else {
 929                                         bb_error_msg_and_die("misplaced option \"%s\"", buf);
 930                                 }
 931 #endif
 932                                 break;
 933                         case NONE:
 934                         default:
 935                                 bb_error_msg_and_die("misplaced option \"%s\"", buf);
 936                         }
 937                 }
 938                 free(buf);
 939         } /* while (fgets) */
 940
 941         if (ferror(f) != 0) {
 942                 /* ferror does NOT set errno! */
 943                 bb_error_msg_and_die("%s: I/O error", filename);
 944         }
 945         fclose(f);
 946
 947         return defn;
 948 }
 949
 950 static char *setlocalenv(const char *format, const char *name, const char *value)
 951 {
 952         char *result;
 953         char *dst;
 954         char *src;
 955         char c;
 956
 957         result = xasprintf(format, name, value);
 958
 959         for (dst = src = result; (c = *src) != '=' && c; src++) {
 960                 if (c == '-')
 961                         c = '_';
 962                 if (c >= 'a' && c <= 'z')
 963                         c -= ('a' - 'A');
 964                 if (isalnum(c) || c == '_')
 965                         *dst++ = c;
 966         }
 967         overlapping_strcpy(dst, src);
 968
 969         return result;
 970 }
 971
 972 static void set_environ(struct interface_defn_t *iface, const char *mode)
 973 {
 974         int i;
 975         char **pp;
 976
 977         if (G.my_environ != NULL) {
 978                 for (pp = G.my_environ; *pp; pp++) {
 979                         free(*pp);
 980                 }
 981                 free(G.my_environ);
 982         }
 983
 984         /* note: last element will stay NULL: */
 985         G.my_environ = xzalloc(sizeof(char *) * (iface->n_options + 6));
 986         pp = G.my_environ;
 987
 988         for (i = 0; i < iface->n_options; i++) {
 989                 if (strcmp(iface->option[i].name, "up") == 0
 990                  || strcmp(iface->option[i].name, "down") == 0
 991                  || strcmp(iface->option[i].name, "pre-up") == 0
 992                  || strcmp(iface->option[i].name, "post-down") == 0
 993                 ) {
 994                         continue;
 995                 }
 996                 *pp++ = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value);
 997         }
 998
 999         *pp++ = setlocalenv("%s=%s", "IFACE", iface->iface);
1000         *pp++ = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name);
1001         *pp++ = setlocalenv("%s=%s", "METHOD", iface->method->name);
1002         *pp++ = setlocalenv("%s=%s", "MODE", mode);
1003         if (G.startup_PATH)
1004                 *pp++ = setlocalenv("%s=%s", "PATH", G.startup_PATH);
1005 }
1006
1007 static int doit(char *str)
1008 {
1009         if (option_mask32 & (OPT_no_act|OPT_verbose)) {
1010                 puts(str);
1011         }
1012         if (!(option_mask32 & OPT_no_act)) {
1013                 pid_t child;
1014                 int status;
1015
1016                 fflush_all();
1017                 child = vfork();
1018                 if (child < 0) /* failure */
1019                         return 0;
1020                 if (child == 0) { /* child */
1021                         execle(G.shell, G.shell, "-c", str, (char *) NULL, G.my_environ);
1022                         _exit(127);
1023                 }
1024                 safe_waitpid(child, &status, 0);
1025                 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
1026                         return 0;
1027                 }
1028         }
1029         return 1;
1030 }
1031
1032 static int execute_all(struct interface_defn_t *ifd, const char *opt)
1033 {
1034         int i;
1035         char *buf;
1036         for (i = 0; i < ifd->n_options; i++) {
1037                 if (strcmp(ifd->option[i].name, opt) == 0) {
1038                         if (!doit(ifd->option[i].value)) {
1039                                 return 0;
1040                         }
1041                 }
1042         }
1043
1044         buf = xasprintf("run-parts /etc/network/if-%s.d", opt);
1045         /* heh, we don't bother free'ing it */
1046         return doit(buf);
1047 }
1048
1049 static int check(char *str)
1050 {
1051         return str != NULL;
1052 }
1053
1054 static int iface_up(struct interface_defn_t *iface)
1055 {
1056         if (!iface->method->up(iface, check)) return -1;
1057         set_environ(iface, "start");
1058         if (!execute_all(iface, "pre-up")) return 0;
1059         if (!iface->method->up(iface, doit)) return 0;
1060         if (!execute_all(iface, "up")) return 0;
1061         return 1;
1062 }
1063
1064 static int iface_down(struct interface_defn_t *iface)
1065 {
1066         if (!iface->method->down(iface,check)) return -1;
1067         set_environ(iface, "stop");
1068         if (!execute_all(iface, "down")) return 0;
1069         if (!iface->method->down(iface, doit)) return 0;
1070         if (!execute_all(iface, "post-down")) return 0;
1071         return 1;
1072 }
1073
1074 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
1075 static int popen2(FILE **in, FILE **out, char *command, char *param)
1076 {
1077         char *argv[3] = { command, param, NULL };
1078         struct fd_pair infd, outfd;
1079         pid_t pid;
1080
1081         xpiped_pair(infd);
1082         xpiped_pair(outfd);
1083
1084         fflush_all();
1085         pid = xvfork();
1086
1087         if (pid == 0) {
1088                 /* Child */
1089                 /* NB: close _first_, then move fds! */
1090                 close(infd.wr);
1091                 close(outfd.rd);
1092                 xmove_fd(infd.rd, 0);
1093                 xmove_fd(outfd.wr, 1);
1094                 BB_EXECVP_or_die(argv);
1095         }
1096         /* parent */
1097         close(infd.rd);
1098         close(outfd.wr);
1099         *in = xfdopen_for_write(infd.wr);
1100         *out = xfdopen_for_read(outfd.rd);
1101         return pid;
1102 }
1103
1104 static char *run_mapping(char *physical, struct mapping_defn_t *map)
1105 {
1106         FILE *in, *out;
1107         int i, status;
1108         pid_t pid;
1109
1110         char *logical = xstrdup(physical);
1111
1112         /* Run the mapping script. Never fails. */
1113         pid = popen2(&in, &out, map->script, physical);
1114
1115         /* Write mappings to stdin of mapping script. */
1116         for (i = 0; i < map->n_mappings; i++) {
1117                 fprintf(in, "%s\n", map->mapping[i]);
1118         }
1119         fclose(in);
1120         safe_waitpid(pid, &status, 0);
1121
1122         if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
1123                 /* If the mapping script exited successfully, try to
1124                  * grab a line of output and use that as the name of the
1125                  * logical interface. */
1126                 char *new_logical = xmalloc_fgetline(out);
1127
1128                 if (new_logical) {
1129                         /* If we are able to read a line of output from the script,
1130                          * remove any trailing whitespace and use this value
1131                          * as the name of the logical interface. */
1132                         char *pch = new_logical + strlen(new_logical) - 1;
1133
1134                         while (pch >= new_logical && isspace(*pch))
1135                                 *(pch--) = '\0';
1136
1137                         free(logical);
1138                         logical = new_logical;
1139                 }
1140         }
1141
1142         fclose(out);
1143
1144         return logical;
1145 }
1146 #endif /* FEATURE_IFUPDOWN_MAPPING */
1147
1148 static llist_t *find_iface_state(llist_t *state_list, const char *iface)
1149 {
1150         unsigned iface_len = strlen(iface);
1151         llist_t *search = state_list;
1152
1153         while (search) {
1154                 if ((strncmp(search->data, iface, iface_len) == 0)
1155                  && (search->data[iface_len] == '=')
1156                 ) {
1157                         return search;
1158                 }
1159                 search = search->link;
1160         }
1161         return NULL;
1162 }
1163
1164 /* read the previous state from the state file */
1165 static llist_t *read_iface_state(void)
1166 {
1167         llist_t *state_list = NULL;
1168         FILE *state_fp = fopen_for_read(CONFIG_IFUPDOWN_IFSTATE_PATH);
1169
1170         if (state_fp) {
1171                 char *start, *end_ptr;
1172                 while ((start = xmalloc_fgets(state_fp)) != NULL) {
1173                         /* We should only need to check for a single character */
1174                         end_ptr = start + strcspn(start, " \t\n");
1175                         *end_ptr = '\0';
1176                         llist_add_to(&state_list, start);
1177                 }
1178                 fclose(state_fp);
1179         }
1180         return state_list;
1181 }
1182
1183
1184 int ifupdown_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1185 int ifupdown_main(int argc UNUSED_PARAM, char **argv)
1186 {
1187         int (*cmds)(struct interface_defn_t *);
1188         struct interfaces_file_t *defn;
1189         llist_t *target_list = NULL;
1190         const char *interfaces = "/etc/network/interfaces";
1191         bool any_failures = 0;
1192
1193         INIT_G();
1194
1195         G.startup_PATH = getenv("PATH");
1196         G.shell = xstrdup(get_shell_name());
1197
1198         cmds = iface_down;
1199         if (applet_name[2] == 'u') {
1200                 /* ifup command */
1201                 cmds = iface_up;
1202         }
1203
1204         getopt32(argv, OPTION_STR, &interfaces);
1205         argv += optind;
1206         if (argv[0]) {
1207                 if (DO_ALL) bb_show_usage();
1208         } else {
1209                 if (!DO_ALL) bb_show_usage();
1210         }
1211
1212         debug_noise("reading %s file:\n", interfaces);
1213         defn = read_interfaces(interfaces);
1214         debug_noise("\ndone reading %s\n\n", interfaces);
1215
1216         /* Create a list of interfaces to work on */
1217         if (DO_ALL) {
1218                 target_list = defn->autointerfaces;
1219         } else {
1220                 llist_add_to_end(&target_list, argv[0]);
1221         }
1222
1223         /* Update the interfaces */
1224         while (target_list) {
1225                 llist_t *iface_list;
1226                 struct interface_defn_t *currif;
1227                 char *iface;
1228                 char *liface;
1229                 char *pch;
1230                 bool okay = 0;
1231                 int cmds_ret;
1232
1233                 iface = xstrdup(target_list->data);
1234                 target_list = target_list->link;
1235
1236                 pch = strchr(iface, '=');
1237                 if (pch) {
1238                         *pch = '\0';
1239                         liface = xstrdup(pch + 1);
1240                 } else {
1241                         liface = xstrdup(iface);
1242                 }
1243
1244                 if (!FORCE) {
1245                         llist_t *state_list = read_iface_state();
1246                         const llist_t *iface_state = find_iface_state(state_list, iface);
1247
1248                         if (cmds == iface_up) {
1249                                 /* ifup */
1250                                 if (iface_state) {
1251                                         bb_error_msg("interface %s already configured", iface);
1252                                         goto next;
1253                                 }
1254                         } else {
1255                                 /* ifdown */
1256                                 if (!iface_state) {
1257                                         bb_error_msg("interface %s not configured", iface);
1258                                         goto next;
1259                                 }
1260                         }
1261                         llist_free(state_list, free);
1262                 }
1263
1264 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
1265                 if ((cmds == iface_up) && !NO_MAPPINGS) {
1266                         struct mapping_defn_t *currmap;
1267
1268                         for (currmap = defn->mappings; currmap; currmap = currmap->next) {
1269                                 int i;
1270                                 for (i = 0; i < currmap->n_matches; i++) {
1271                                         if (fnmatch(currmap->match[i], liface, 0) != 0)
1272                                                 continue;
1273                                         if (VERBOSE) {
1274                                                 printf("Running mapping script %s on %s\n", currmap->script, liface);
1275                                         }
1276                                         liface = run_mapping(iface, currmap);
1277                                         break;
1278                                 }
1279                         }
1280                 }
1281 #endif
1282
1283                 iface_list = defn->ifaces;
1284                 while (iface_list) {
1285                         currif = (struct interface_defn_t *) iface_list->data;
1286                         if (strcmp(liface, currif->iface) == 0) {
1287                                 char *oldiface = currif->iface;
1288
1289                                 okay = 1;
1290                                 currif->iface = iface;
1291
1292                                 debug_noise("\nConfiguring interface %s (%s)\n", liface, currif->address_family->name);
1293
1294                                 /* Call the cmds function pointer, does either iface_up() or iface_down() */
1295                                 cmds_ret = cmds(currif);
1296                                 if (cmds_ret == -1) {
1297                                         bb_error_msg("don't seem to have all the variables for %s/%s",
1298                                                         liface, currif->address_family->name);
1299                                         any_failures = 1;
1300                                 } else if (cmds_ret == 0) {
1301                                         any_failures = 1;
1302                                 }
1303
1304                                 currif->iface = oldiface;
1305                         }
1306                         iface_list = iface_list->link;
1307                 }
1308                 if (VERBOSE) {
1309                         bb_putchar('\n');
1310                 }
1311
1312                 if (!okay && !FORCE) {
1313                         bb_error_msg("ignoring unknown interface %s", liface);
1314                         any_failures = 1;
1315                 } else if (!NO_ACT) {
1316                         /* update the state file */
1317                         FILE *state_fp;
1318                         llist_t *state;
1319                         llist_t *state_list = read_iface_state();
1320                         llist_t *iface_state = find_iface_state(state_list, iface);
1321
1322                         if (cmds == iface_up) {
1323                                 char * const newiface = xasprintf("%s=%s", iface, liface);
1324                                 if (iface_state == NULL) {
1325                                         llist_add_to_end(&state_list, newiface);
1326                                 } else {
1327                                         free(iface_state->data);
1328                                         iface_state->data = newiface;
1329                                 }
1330                         } else {
1331                                 /* Remove an interface from state_list */
1332                                 llist_unlink(&state_list, iface_state);
1333                                 free(llist_pop(&iface_state));
1334                         }
1335
1336                         /* Actually write the new state */
1337                         state_fp = xfopen_for_write(CONFIG_IFUPDOWN_IFSTATE_PATH);
1338                         state = state_list;
1339                         while (state) {
1340                                 if (state->data) {
1341                                         fprintf(state_fp, "%s\n", state->data);
1342                                 }
1343                                 state = state->link;
1344                         }
1345                         fclose(state_fp);
1346                         llist_free(state_list, free);
1347                 }
1348  next:
1349                 free(iface);
1350                 free(liface);
1351         }
1352
1353         return any_failures;
1354 }