networking/ifupdown.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  *  ifupdown for busybox
   4  *  Copyright (c) 2002 Glenn McGrath <bug1@iinet.net.au>
   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  *
  15  *  This program is free software; you can redistribute it and/or modify
  16  *  it under the terms of the GNU General Public License as published by
  17  *  the Free Software Foundation; either version 2 of the License, or
  18  *  (at your option) any later version.
  19  *
  20  *  This program is distributed in the hope that it will be useful,
  21  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  *  GNU General Public License for more details.
  24  *
  25  *  You should have received a copy of the GNU General Public License
  26  *  along with this program; if not, write to the Free Software
  27  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  28  */
  29
  30 /* TODO: standardise execute() return codes to return 0 for success and 1 for failure */
  31
  32 #include <sys/stat.h>
  33 #include <sys/utsname.h>
  34 #include <sys/wait.h>
  35
  36 #include <ctype.h>
  37 #include <errno.h>
  38 #include <fcntl.h>
  39 #include <fnmatch.h>
  40 #include <getopt.h>
  41 #include <stdarg.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <unistd.h>
  46
  47 #include "libbb.h"
  48
  49 #define MAX_OPT_DEPTH 10
  50 #define EUNBALBRACK 10001
  51 #define EUNDEFVAR   10002
  52 #define EUNBALPER   10000
  53
  54 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
  55 #define MAX_INTERFACE_LENGTH 10
  56 #endif
  57
  58 #if 0
  59 #define debug_noise(fmt, args...) printf(fmt, ## args)
  60 #else
  61 #define debug_noise(fmt, args...)
  62 #endif
  63
  64 /* Forward declaration */
  65 struct interface_defn_t;
  66
  67 typedef int (execfn)(char *command);
  68 typedef int (command_set)(struct interface_defn_t *ifd, execfn *e);
  69
  70 struct method_t
  71 {
  72         char *name;
  73         command_set *up;
  74         command_set *down;
  75 };
  76
  77 struct address_family_t
  78 {
  79         char *name;
  80         int n_methods;
  81         struct method_t *method;
  82 };
  83
  84 struct mapping_defn_t
  85 {
  86         struct mapping_defn_t *next;
  87
  88         int max_matches;
  89         int n_matches;
  90         char **match;
  91
  92         char *script;
  93
  94         int max_mappings;
  95         int n_mappings;
  96         char **mapping;
  97 };
  98
  99 struct variable_t
 100 {
 101         char *name;
 102         char *value;
 103 };
 104
 105 struct interface_defn_t
 106 {
 107         struct interface_defn_t *prev;
 108         struct interface_defn_t *next;
 109
 110         char *iface;
 111         struct address_family_t *address_family;
 112         struct method_t *method;
 113
 114         int automatic;
 115
 116         int max_options;
 117         int n_options;
 118         struct variable_t *option;
 119 };
 120
 121 struct interfaces_file_t
 122 {
 123         llist_t *autointerfaces;
 124         llist_t *ifaces;
 125         struct mapping_defn_t *mappings;
 126 };
 127
 128 static char no_act = 0;
 129 static char verbose = 0;
 130 static char **__myenviron = NULL;
 131
 132 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 133
 134 static unsigned int count_bits(unsigned int a)
 135 {
 136         unsigned int result;
 137         result = (a & 0x55) + ((a >> 1) & 0x55);
 138         result = (result & 0x33) + ((result >> 2) & 0x33);
 139         return((result & 0x0F) + ((result >> 4) & 0x0F));
 140 }
 141
 142 static int count_netmask_bits(char *dotted_quad)
 143 {
 144         unsigned int result, a, b, c, d;
 145         /* Found a netmask...  Check if it is dotted quad */
 146         if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) != 4)
 147                 return -1;
 148         result = count_bits(a);
 149         result += count_bits(b);
 150         result += count_bits(c);
 151         result += count_bits(d);
 152         return ((int)result);
 153 }
 154 #endif
 155
 156 static void addstr(char **buf, size_t *len, size_t *pos, char *str, size_t str_length)
 157 {
 158         if (*pos + str_length >= *len) {
 159                 char *newbuf;
 160
 161                 newbuf = xrealloc(*buf, *len * 2 + str_length + 1);
 162                 *buf = newbuf;
 163                 *len = *len * 2 + str_length + 1;
 164         }
 165
 166         while (str_length-- >= 1) {
 167                 (*buf)[(*pos)++] = *str;
 168                 str++;
 169         }
 170         (*buf)[*pos] = '\0';
 171 }
 172
 173 static int strncmpz(char *l, char *r, size_t llen)
 174 {
 175         int i = strncmp(l, r, llen);
 176
 177         if (i == 0) {
 178                 return(-r[llen]);
 179         } else {
 180                 return(i);
 181         }
 182 }
 183
 184 static char *get_var(char *id, size_t idlen, struct interface_defn_t *ifd)
 185 {
 186         int i;
 187
 188         if (strncmpz(id, "iface", idlen) == 0) {
 189                 char *result;
 190                 static char label_buf[20];
 191                 strncpy(label_buf, ifd->iface, 19);
 192                 label_buf[19]=0;
 193                 result = strchr(label_buf, ':');
 194                 if (result) {
 195                         *result=0;
 196                 }
 197                 return( label_buf);
 198         } else if (strncmpz(id, "label", idlen) == 0) {
 199                 return (ifd->iface);
 200         } else {
 201                 for (i = 0; i < ifd->n_options; i++) {
 202                         if (strncmpz(id, ifd->option[i].name, idlen) == 0) {
 203                                 return (ifd->option[i].value);
 204                         }
 205                 }
 206         }
 207
 208         return(NULL);
 209 }
 210
 211 static char *parse(char *command, struct interface_defn_t *ifd)
 212 {
 213
 214         char *result = NULL;
 215         size_t pos = 0, len = 0;
 216         size_t old_pos[MAX_OPT_DEPTH] = { 0 };
 217         int okay[MAX_OPT_DEPTH] = { 1 };
 218         int opt_depth = 1;
 219
 220         while (*command) {
 221                 switch (*command) {
 222
 223                         default:
 224                                 addstr(&result, &len, &pos, command, 1);
 225                                 command++;
 226                                 break;
 227                         case '\\':
 228                                 if (command[1]) {
 229                                         addstr(&result, &len, &pos, command + 1, 1);
 230                                         command += 2;
 231                                 } else {
 232                                         addstr(&result, &len, &pos, command, 1);
 233                                         command++;
 234                                 }
 235                                 break;
 236                         case '[':
 237                                 if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) {
 238                                         old_pos[opt_depth] = pos;
 239                                         okay[opt_depth] = 1;
 240                                         opt_depth++;
 241                                         command += 2;
 242                                 } else {
 243                                         addstr(&result, &len, &pos, "[", 1);
 244                                         command++;
 245                                 }
 246                                 break;
 247                         case ']':
 248                                 if (command[1] == ']' && opt_depth > 1) {
 249                                         opt_depth--;
 250                                         if (!okay[opt_depth]) {
 251                                                 pos = old_pos[opt_depth];
 252                                                 result[pos] = '\0';
 253                                         }
 254                                         command += 2;
 255                                 } else {
 256                                         addstr(&result, &len, &pos, "]", 1);
 257                                         command++;
 258                                 }
 259                                 break;
 260                         case '%':
 261                                 {
 262                                         char *nextpercent;
 263                                         char *varvalue;
 264
 265                                         command++;
 266                                         nextpercent = strchr(command, '%');
 267                                         if (!nextpercent) {
 268                                                 errno = EUNBALPER;
 269                                                 free(result);
 270                                                 return (NULL);
 271                                         }
 272
 273                                         varvalue = get_var(command, nextpercent - command, ifd);
 274
 275                                         if (varvalue) {
 276                                                 addstr(&result, &len, &pos, varvalue, bb_strlen(varvalue));
 277                                         } else {
 278 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 279                                                 /* Sigh...  Add a special case for 'ip' to convert from
 280                                                  * dotted quad to bit count style netmasks.  */
 281                                                 if (strncmp(command, "bnmask", 6)==0) {
 282                                                         int res;
 283                                                         varvalue = get_var("netmask", 7, ifd);
 284                                                         if (varvalue && (res=count_netmask_bits(varvalue)) > 0) {
 285                                                                 char argument[255];
 286                                                                 sprintf(argument, "%d", res);
 287                                                                 addstr(&result, &len, &pos, argument, bb_strlen(argument));
 288                                                                 command = nextpercent + 1;
 289                                                                 break;
 290                                                         }
 291                                                 }
 292 #endif
 293                                                 okay[opt_depth - 1] = 0;
 294                                         }
 295
 296                                         command = nextpercent + 1;
 297                                 }
 298                                 break;
 299                 }
 300         }
 301
 302         if (opt_depth > 1) {
 303                 errno = EUNBALBRACK;
 304                 free(result);
 305                 return(NULL);
 306         }
 307
 308         if (!okay[0]) {
 309                 errno = EUNDEFVAR;
 310                 free(result);
 311                 return(NULL);
 312         }
 313
 314         return(result);
 315 }
 316
 317 static int execute(char *command, struct interface_defn_t *ifd, execfn *exec)
 318 {
 319         char *out;
 320         int ret;
 321
 322         out = parse(command, ifd);
 323         if (!out) {
 324                 return(0);
 325         }
 326         ret = (*exec) (out);
 327
 328         free(out);
 329         if (ret != 1) {
 330                 return(0);
 331         }
 332         return(1);
 333 }
 334
 335 #ifdef CONFIG_FEATURE_IFUPDOWN_IPX
 336 static int static_up_ipx(struct interface_defn_t *ifd, execfn *exec)
 337 {
 338         return(execute("ipx_interface add %iface% %frame% %netnum%", ifd, exec));
 339 }
 340
 341 static int static_down_ipx(struct interface_defn_t *ifd, execfn *exec)
 342 {
 343         return(execute("ipx_interface del %iface% %frame%", ifd, exec));
 344 }
 345
 346 static int dynamic_up(struct interface_defn_t *ifd, execfn *exec)
 347 {
 348         return(execute("ipx_interface add %iface% %frame%", ifd, exec));
 349 }
 350
 351 static int dynamic_down(struct interface_defn_t *ifd, execfn *exec)
 352 {
 353         return(execute("ipx_interface del %iface% %frame%", ifd, exec));
 354 }
 355
 356 static struct method_t methods_ipx[] = {
 357         { "dynamic", dynamic_up, dynamic_down, },
 358         { "static", static_up_ipx, static_down_ipx, },
 359 };
 360
 361 static struct address_family_t addr_ipx = {
 362         "ipx",
 363         sizeof(methods_ipx) / sizeof(struct method_t),
 364         methods_ipx
 365 };
 366 #endif /* IFUP_FEATURE_IPX */
 367
 368 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
 369 static int loopback_up6(struct interface_defn_t *ifd, execfn *exec)
 370 {
 371 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 372         int result;
 373         result =execute("ip addr add ::1 dev %iface%", ifd, exec);
 374         result += execute("ip link set %iface% up", ifd, exec);
 375         return ((result == 2) ? 2 : 0);
 376 #else
 377         return( execute("ifconfig %iface% add ::1", ifd, exec));
 378 #endif
 379 }
 380
 381 static int loopback_down6(struct interface_defn_t *ifd, execfn *exec)
 382 {
 383 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 384         return(execute("ip link set %iface% down", ifd, exec));
 385 #else
 386         return(execute("ifconfig %iface% del ::1", ifd, exec));
 387 #endif
 388 }
 389
 390 static int static_up6(struct interface_defn_t *ifd, execfn *exec)
 391 {
 392         int result;
 393 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 394         result = execute("ip addr add %address%/%netmask% dev %iface% [[label %label%]]", ifd, exec);
 395         result += execute("ip link set [[mtu %mtu%]] [[address %hwaddress%]] %iface% up", ifd, exec);
 396         result += execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec);
 397 #else
 398         result = execute("ifconfig %iface% [[media %media%]] [[hw %hwaddress%]] [[mtu %mtu%]] up", ifd, exec);
 399         result += execute("ifconfig %iface% add %address%/%netmask%", ifd, exec);
 400         result += execute("[[ route -A inet6 add ::/0 gw %gateway% ]]", ifd, exec);
 401 #endif
 402         return ((result == 3) ? 3 : 0);
 403 }
 404
 405 static int static_down6(struct interface_defn_t *ifd, execfn *exec)
 406 {
 407 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 408         return(execute("ip link set %iface% down", ifd, exec));
 409 #else
 410         return(execute("ifconfig %iface% down", ifd, exec));
 411 #endif
 412 }
 413
 414 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 415 static int v4tunnel_up(struct interface_defn_t *ifd, execfn *exec)
 416 {
 417         int result;
 418         result = execute("ip tunnel add %iface% mode sit remote "
 419                                 "%endpoint% [[local %local%]] [[ttl %ttl%]]", ifd, exec);
 420         result += execute("ip link set %iface% up", ifd, exec);
 421         result += execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec);
 422         result += execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec);
 423         return ((result == 4) ? 4 : 0);
 424 }
 425
 426 static int v4tunnel_down(struct interface_defn_t * ifd, execfn * exec)
 427 {
 428         return( execute("ip tunnel del %iface%", ifd, exec));
 429 }
 430 #endif
 431
 432 static struct method_t methods6[] = {
 433 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 434         { "v4tunnel", v4tunnel_up, v4tunnel_down, },
 435 #endif
 436         { "static", static_up6, static_down6, },
 437         { "loopback", loopback_up6, loopback_down6, },
 438 };
 439
 440 static struct address_family_t addr_inet6 = {
 441         "inet6",
 442         sizeof(methods6) / sizeof(struct method_t),
 443         methods6
 444 };
 445 #endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */
 446
 447 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
 448 static int loopback_up(struct interface_defn_t *ifd, execfn *exec)
 449 {
 450 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 451         int result;
 452         result = execute("ip addr add 127.0.0.1/8 dev %iface%", ifd, exec);
 453         result += execute("ip link set %iface% up", ifd, exec);
 454         return ((result == 2) ? 2 : 0);
 455 #else
 456         return( execute("ifconfig %iface% 127.0.0.1 up", ifd, exec));
 457 #endif
 458 }
 459
 460 static int loopback_down(struct interface_defn_t *ifd, execfn *exec)
 461 {
 462 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 463         int result;
 464         result = execute("ip addr flush dev %iface%", ifd, exec);
 465         result += execute("ip link set %iface% down", ifd, exec);
 466         return ((result == 2) ? 2 : 0);
 467 #else
 468         return( execute("ifconfig %iface% 127.0.0.1 down", ifd, exec));
 469 #endif
 470 }
 471
 472 static int static_up(struct interface_defn_t *ifd, execfn *exec)
 473 {
 474         int result;
 475 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 476         result = execute("ip addr add %address%/%bnmask% [[broadcast %broadcast%]] "
 477                         "dev %iface% [[peer %pointopoint%]] [[label %label%]]", ifd, exec);
 478         result += execute("ip link set [[mtu %mtu%]] [[address %hwaddress%]] %iface% up", ifd, exec);
 479         result += execute("[[ ip route add default via %gateway% dev %iface% ]]", ifd, exec);
 480         return ((result == 3) ? 3 : 0);
 481 #else
 482         result = execute("ifconfig %iface% %address% netmask %netmask% "
 483                                 "[[broadcast %broadcast%]]      [[pointopoint %pointopoint%]] "
 484                                 "[[media %media%]] [[mtu %mtu%]]        [[hw %hwaddress%]] up",
 485                                 ifd, exec);
 486         result += execute("[[ route add default gw %gateway% %iface% ]]", ifd, exec);
 487         return ((result == 2) ? 2 : 0);
 488 #endif
 489 }
 490
 491 static int static_down(struct interface_defn_t *ifd, execfn *exec)
 492 {
 493         int result;
 494 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 495         result = execute("ip addr flush dev %iface%", ifd, exec);
 496         result += execute("ip link set %iface% down", ifd, exec);
 497 #else
 498         result = execute("[[ route del default gw %gateway% %iface% ]]", ifd, exec);
 499         result += execute("ifconfig %iface% down", ifd, exec);
 500 #endif
 501         return ((result == 2) ? 2 : 0);
 502 }
 503
 504 static int execable(char *program)
 505 {
 506         struct stat buf;
 507         if (0 == stat(program, &buf)) {
 508                 if (S_ISREG(buf.st_mode) && (S_IXUSR & buf.st_mode)) {
 509                         return(1);
 510                 }
 511         }
 512         return(0);
 513 }
 514
 515 static int dhcp_up(struct interface_defn_t *ifd, execfn *exec)
 516 {
 517         if (execable("/sbin/udhcpc")) {
 518                 return( execute("udhcpc -n -p /var/run/udhcpc.%iface%.pid -i "
 519                                         "%iface% [[-H %hostname%]] [[-c %clientid%]]", ifd, exec));
 520         } else if (execable("/sbin/pump")) {
 521                 return( execute("pump -i %iface% [[-h %hostname%]] [[-l %leasehours%]]", ifd, exec));
 522         } else if (execable("/sbin/dhclient")) {
 523                 return( execute("dhclient -pf /var/run/dhclient.%iface%.pid %iface%", ifd, exec));
 524         } else if (execable("/sbin/dhcpcd")) {
 525                 return( execute("dhcpcd [[-h %hostname%]] [[-i %vendor%]] [[-I %clientid%]] "
 526                                         "[[-l %leasetime%]] %iface%", ifd, exec));
 527         }
 528         return(0);
 529 }
 530
 531 static int dhcp_down(struct interface_defn_t *ifd, execfn *exec)
 532 {
 533         int result = 0;
 534         if (execable("/sbin/udhcpc")) {
 535                 /* SIGUSR2 forces udhcpc to release the current lease and go inactive,
 536                  * and SIGTERM causes udhcpc to exit.  Signals are queued and processed
 537                  * sequentially so we don't need to sleep */
 538                 result = execute("kill -USR2 `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec);
 539                 result += execute("kill -TERM `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec);
 540         } else if (execable("/sbin/pump")) {
 541                 result = execute("pump -i %iface% -k", ifd, exec);
 542         } else if (execable("/sbin/dhclient")) {
 543                 result = execute("kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null", ifd, exec);
 544         } else if (execable("/sbin/dhcpcd")) {
 545                 result = execute("dhcpcd -k %iface%", ifd, exec);
 546         }
 547         return (result || static_down(ifd, exec));
 548 }
 549
 550 static int bootp_up(struct interface_defn_t *ifd, execfn *exec)
 551 {
 552         return( execute("bootpc [[--bootfile %bootfile%]] --dev %iface% "
 553                                 "[[--server %server%]] [[--hwaddr %hwaddr%]] "
 554                                 "--returniffail --serverbcast", ifd, exec));
 555 }
 556
 557 static int ppp_up(struct interface_defn_t *ifd, execfn *exec)
 558 {
 559         return( execute("pon [[%provider%]]", ifd, exec));
 560 }
 561
 562 static int ppp_down(struct interface_defn_t *ifd, execfn *exec)
 563 {
 564         return( execute("poff [[%provider%]]", ifd, exec));
 565 }
 566
 567 static int wvdial_up(struct interface_defn_t *ifd, execfn *exec)
 568 {
 569         return( execute("/sbin/start-stop-daemon --start -x /usr/bin/wvdial "
 570                                 "-p /var/run/wvdial.%iface% -b -m -- [[ %provider% ]]", ifd, exec));
 571 }
 572
 573 static int wvdial_down(struct interface_defn_t *ifd, execfn *exec)
 574 {
 575         return( execute("/sbin/start-stop-daemon --stop -x /usr/bin/wvdial "
 576                                 "-p /var/run/wvdial.%iface% -s 2", ifd, exec));
 577 }
 578
 579 static struct method_t methods[] =
 580 {
 581         { "wvdial", wvdial_up, wvdial_down, },
 582         { "ppp", ppp_up, ppp_down, },
 583         { "static", static_up, static_down, },
 584         { "bootp", bootp_up, static_down, },
 585         { "dhcp", dhcp_up, dhcp_down, },
 586         { "loopback", loopback_up, loopback_down, },
 587 };
 588
 589 static struct address_family_t addr_inet =
 590 {
 591         "inet",
 592         sizeof(methods) / sizeof(struct method_t),
 593         methods
 594 };
 595
 596 #endif  /* ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 */
 597
 598 static char *next_word(char **buf)
 599 {
 600         unsigned short length;
 601         char *word;
 602
 603         if ((buf == NULL) || (*buf == NULL) || (**buf == '\0')) {
 604                 return NULL;
 605         }
 606
 607         /* Skip over leading whitespace */
 608         word = *buf;
 609         while (isspace(*word)) {
 610                 ++word;
 611         }
 612
 613         /* Skip over comments */
 614         if (*word == '#') {
 615                 return(NULL);
 616         }
 617
 618         /* Find the length of this word */
 619         length = strcspn(word, " \t\n");
 620         if (length == 0) {
 621                 return(NULL);
 622         }
 623         *buf = word + length;
 624         /*DBU:[dave@cray.com] if we are already at EOL dont't increment beyond it */
 625         if (**buf) {
 626                 **buf = '\0';
 627                 (*buf)++;
 628         }
 629
 630         return word;
 631 }
 632
 633 static struct address_family_t *get_address_family(struct address_family_t *af[], char *name)
 634 {
 635         int i;
 636
 637         for (i = 0; af[i]; i++) {
 638                 if (strcmp(af[i]->name, name) == 0) {
 639                         return af[i];
 640                 }
 641         }
 642         return NULL;
 643 }
 644
 645 static struct method_t *get_method(struct address_family_t *af, char *name)
 646 {
 647         int i;
 648
 649         for (i = 0; i < af->n_methods; i++) {
 650                 if (strcmp(af->method[i].name, name) == 0) {
 651                         return &af->method[i];
 652                 }
 653         }
 654         return(NULL);
 655 }
 656
 657 static int duplicate_if(struct interface_defn_t *ifa, struct interface_defn_t *ifb)
 658 {
 659         if (strcmp(ifa->iface, ifb->iface) != 0) {
 660                 return(0);
 661         }
 662         if (ifa->address_family != ifb->address_family) {
 663                 return(0);
 664         }
 665         return(1);
 666 }
 667
 668 static const llist_t *find_list_string(const llist_t *list, const char *string)
 669 {
 670         while (list) {
 671                 if (strcmp(list->data, string) == 0) {
 672                         return(list);
 673                 }
 674                 list = list->link;
 675         }
 676         return(NULL);
 677 }
 678
 679 static struct interfaces_file_t *read_interfaces(const char *filename)
 680 {
 681 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 682         struct mapping_defn_t *currmap = NULL;
 683 #endif
 684         struct interface_defn_t *currif = NULL;
 685         struct interfaces_file_t *defn;
 686         FILE *f;
 687         char *firstword;
 688         char *buf;
 689
 690         enum { NONE, IFACE, MAPPING } currently_processing = NONE;
 691
 692         defn = xmalloc(sizeof(struct interfaces_file_t));
 693         defn->autointerfaces = NULL;
 694         defn->mappings = NULL;
 695         defn->ifaces = NULL;
 696
 697         f = bb_xfopen(filename, "r");
 698
 699         while ((buf = bb_get_chomped_line_from_file(f)) != NULL) {
 700                 char *buf_ptr = buf;
 701
 702                 firstword = next_word(&buf_ptr);
 703                 if (firstword == NULL) {
 704                         free(buf);
 705                         continue;       /* blank line */
 706                 }
 707
 708                 if (strcmp(firstword, "mapping") == 0) {
 709 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 710                         currmap = xmalloc(sizeof(struct mapping_defn_t));
 711                         currmap->max_matches = 0;
 712                         currmap->n_matches = 0;
 713                         currmap->match = NULL;
 714
 715                         while ((firstword = next_word(&buf_ptr)) != NULL) {
 716                                 if (currmap->max_matches == currmap->n_matches) {
 717                                         currmap->max_matches = currmap->max_matches * 2 + 1;
 718                                         currmap->match = xrealloc(currmap->match, sizeof(currmap->match) * currmap->max_matches);
 719                                 }
 720
 721                                 currmap->match[currmap->n_matches++] = bb_xstrdup(firstword);
 722                         }
 723                         currmap->max_mappings = 0;
 724                         currmap->n_mappings = 0;
 725                         currmap->mapping = NULL;
 726                         currmap->script = NULL;
 727                         {
 728                                 struct mapping_defn_t **where = &defn->mappings;
 729                                 while (*where != NULL) {
 730                                         where = &(*where)->next;
 731                                 }
 732                                 *where = currmap;
 733                                 currmap->next = NULL;
 734                         }
 735                         debug_noise("Added mapping\n");
 736 #endif
 737                         currently_processing = MAPPING;
 738                 } else if (strcmp(firstword, "iface") == 0) {
 739                         {
 740                                 char *iface_name;
 741                                 char *address_family_name;
 742                                 char *method_name;
 743                                 struct address_family_t *addr_fams[] = {
 744 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
 745                                         &addr_inet,
 746 #endif
 747 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
 748                                         &addr_inet6,
 749 #endif
 750 #ifdef CONFIG_FEATURE_IFUPDOWN_IPX
 751                                         &addr_ipx,
 752 #endif
 753                                         NULL
 754                                 };
 755
 756                                 currif = xmalloc(sizeof(struct interface_defn_t));
 757                                 iface_name = next_word(&buf_ptr);
 758                                 address_family_name = next_word(&buf_ptr);
 759                                 method_name = next_word(&buf_ptr);
 760
 761                                 if (buf_ptr == NULL) {
 762                                         bb_error_msg("too few parameters for line \"%s\"", buf);
 763                                         return NULL;
 764                                 }
 765
 766                                 /* ship any trailing whitespace */
 767                                 while (isspace(*buf_ptr)) {
 768                                         ++buf_ptr;
 769                                 }
 770
 771                                 if (buf_ptr[0] != '\0') {
 772                                         bb_error_msg("too many parameters \"%s\"", buf);
 773                                         return NULL;
 774                                 }
 775
 776                                 currif->iface = bb_xstrdup(iface_name);
 777
 778                                 currif->address_family = get_address_family(addr_fams, address_family_name);
 779                                 if (!currif->address_family) {
 780                                         bb_error_msg("unknown address type \"%s\"", address_family_name);
 781                                         return NULL;
 782                                 }
 783
 784                                 currif->method = get_method(currif->address_family, method_name);
 785                                 if (!currif->method) {
 786                                         bb_error_msg("unknown method \"%s\"", method_name);
 787                                         return NULL;
 788                                 }
 789
 790                                 currif->automatic = 1;
 791                                 currif->max_options = 0;
 792                                 currif->n_options = 0;
 793                                 currif->option = NULL;
 794
 795                                 {
 796                                         struct interface_defn_t *tmp;
 797                                         llist_t *iface_list;
 798                                         iface_list = defn->ifaces;
 799                                         while (iface_list) {
 800                                                 tmp = (struct interface_defn_t *) iface_list->data;
 801                                                 if (duplicate_if(tmp, currif)) {
 802                                                         bb_error_msg("duplicate interface \"%s\"", tmp->iface);
 803                                                         return NULL;
 804                                                 }
 805                                                 iface_list = iface_list->link;
 806                                         }
 807
 808                                         defn->ifaces = llist_add_to_end(defn->ifaces, (char*)currif);
 809                                 }
 810                                 debug_noise("iface %s %s %s\n", currif->iface, address_family_name, method_name);
 811                         }
 812                         currently_processing = IFACE;
 813                 } else if (strcmp(firstword, "auto") == 0) {
 814                         while ((firstword = next_word(&buf_ptr)) != NULL) {
 815
 816                                 /* Check the interface isnt already listed */
 817                                 if (find_list_string(defn->autointerfaces, firstword)) {
 818                                         bb_perror_msg_and_die("interface declared auto twice \"%s\"", buf);
 819                                 }
 820
 821                                 /* Add the interface to the list */
 822                                 defn->autointerfaces = llist_add_to_end(defn->autointerfaces, strdup(firstword));
 823                                 debug_noise("\nauto %s\n", firstword);
 824                         }
 825                         currently_processing = NONE;
 826                 } else {
 827                         switch (currently_processing) {
 828                                 case IFACE:
 829                                         {
 830                                                 int i;
 831
 832                                                 if (bb_strlen(buf_ptr) == 0) {
 833                                                         bb_error_msg("option with empty value \"%s\"", buf);
 834                                                         return NULL;
 835                                                 }
 836
 837                                                 if (strcmp(firstword, "up") != 0
 838                                                                 && strcmp(firstword, "down") != 0
 839                                                                 && strcmp(firstword, "pre-up") != 0
 840                                                                 && strcmp(firstword, "post-down") != 0) {
 841                                                         for (i = 0; i < currif->n_options; i++) {
 842                                                                 if (strcmp(currif->option[i].name, firstword) == 0) {
 843                                                                         bb_error_msg("duplicate option \"%s\"", buf);
 844                                                                         return NULL;
 845                                                                 }
 846                                                         }
 847                                                 }
 848                                         }
 849                                         if (currif->n_options >= currif->max_options) {
 850                                                 struct variable_t *opt;
 851
 852                                                 currif->max_options = currif->max_options + 10;
 853                                                 opt = xrealloc(currif->option, sizeof(*opt) * currif->max_options);
 854                                                 currif->option = opt;
 855                                         }
 856                                         currif->option[currif->n_options].name = bb_xstrdup(firstword);
 857                                         currif->option[currif->n_options].value = bb_xstrdup(buf_ptr);
 858                                         if (!currif->option[currif->n_options].name) {
 859                                                 perror(filename);
 860                                                 return NULL;
 861                                         }
 862                                         if (!currif->option[currif->n_options].value) {
 863                                                 perror(filename);
 864                                                 return NULL;
 865                                         }
 866                                         debug_noise("\t%s=%s\n", currif->option[currif->n_options].name,
 867                                                         currif->option[currif->n_options].value);
 868                                         currif->n_options++;
 869                                         break;
 870                                 case MAPPING:
 871 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 872                                         if (strcmp(firstword, "script") == 0) {
 873                                                 if (currmap->script != NULL) {
 874                                                         bb_error_msg("duplicate script in mapping \"%s\"", buf);
 875                                                         return NULL;
 876                                                 } else {
 877                                                         currmap->script = bb_xstrdup(next_word(&buf_ptr));
 878                                                 }
 879                                         } else if (strcmp(firstword, "map") == 0) {
 880                                                 if (currmap->max_mappings == currmap->n_mappings) {
 881                                                         currmap->max_mappings = currmap->max_mappings * 2 + 1;
 882                                                         currmap->mapping = xrealloc(currmap->mapping, sizeof(char *) * currmap->max_mappings);
 883                                                 }
 884                                                 currmap->mapping[currmap->n_mappings] = bb_xstrdup(next_word(&buf_ptr));
 885                                                 currmap->n_mappings++;
 886                                         } else {
 887                                                 bb_error_msg("misplaced option \"%s\"", buf);
 888                                                 return NULL;
 889                                         }
 890 #endif
 891                                         break;
 892                                 case NONE:
 893                                 default:
 894                                         bb_error_msg("misplaced option \"%s\"", buf);
 895                                         return NULL;
 896                         }
 897                 }
 898                 free(buf);
 899         }
 900         if (ferror(f) != 0) {
 901                 bb_perror_msg_and_die("%s", filename);
 902         }
 903         fclose(f);
 904
 905         return defn;
 906 }
 907
 908 static char *setlocalenv(char *format, char *name, char *value)
 909 {
 910         char *result;
 911         char *here;
 912         char *there;
 913
 914         result = xmalloc(bb_strlen(format) + bb_strlen(name) + bb_strlen(value) + 1);
 915
 916         sprintf(result, format, name, value);
 917
 918         for (here = there = result; *there != '=' && *there; there++) {
 919                 if (*there == '-')
 920                         *there = '_';
 921                 if (isalpha(*there))
 922                         *there = toupper(*there);
 923
 924                 if (isalnum(*there) || *there == '_') {
 925                         *here = *there;
 926                         here++;
 927                 }
 928         }
 929         memmove(here, there, bb_strlen(there) + 1);
 930
 931         return result;
 932 }
 933
 934 static void set_environ(struct interface_defn_t *iface, char *mode)
 935 {
 936         char **environend;
 937         int i;
 938         const int n_env_entries = iface->n_options + 5;
 939         char **ppch;
 940
 941         if (__myenviron != NULL) {
 942                 for (ppch = __myenviron; *ppch; ppch++) {
 943                         free(*ppch);
 944                         *ppch = NULL;
 945                 }
 946                 free(__myenviron);
 947                 __myenviron = NULL;
 948         }
 949         __myenviron = xmalloc(sizeof(char *) * (n_env_entries + 1 /* for final NULL */ ));
 950         environend = __myenviron;
 951         *environend = NULL;
 952
 953         for (i = 0; i < iface->n_options; i++) {
 954                 if (strcmp(iface->option[i].name, "up") == 0
 955                                 || strcmp(iface->option[i].name, "down") == 0
 956                                 || strcmp(iface->option[i].name, "pre-up") == 0
 957                                 || strcmp(iface->option[i].name, "post-down") == 0) {
 958                         continue;
 959                 }
 960                 *(environend++) = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value);
 961                 *environend = NULL;
 962         }
 963
 964         *(environend++) = setlocalenv("%s=%s", "IFACE", iface->iface);
 965         *environend = NULL;
 966         *(environend++) = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name);
 967         *environend = NULL;
 968         *(environend++) = setlocalenv("%s=%s", "METHOD", iface->method->name);
 969         *environend = NULL;
 970         *(environend++) = setlocalenv("%s=%s", "MODE", mode);
 971         *environend = NULL;
 972         *(environend++) = setlocalenv("%s=%s", "PATH", "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin");
 973         *environend = NULL;
 974 }
 975
 976 static int doit(char *str)
 977 {
 978         if (verbose || no_act) {
 979                 printf("%s\n", str);
 980         }
 981         if (!no_act) {
 982                 pid_t child;
 983                 int status;
 984
 985                 fflush(NULL);
 986                 switch (child = fork()) {
 987                         case -1:                /* failure */
 988                                 return 0;
 989                         case 0:         /* child */
 990                                 execle(DEFAULT_SHELL, DEFAULT_SHELL, "-c", str, NULL, __myenviron);
 991                                 exit(127);
 992                 }
 993                 waitpid(child, &status, 0);
 994                 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
 995                         return 0;
 996                 }
 997         }
 998         return (1);
 999 }
1000
1001 static int execute_all(struct interface_defn_t *ifd, execfn *exec, const char *opt)
1002 {
1003         int i;
1004         char *buf;
1005         for (i = 0; i < ifd->n_options; i++) {
1006                 if (strcmp(ifd->option[i].name, opt) == 0) {
1007                         if (!(*exec) (ifd->option[i].value)) {
1008                                 return 0;
1009                         }
1010                 }
1011         }
1012
1013         buf = bb_xasprintf("run-parts /etc/network/if-%s.d", opt);
1014         if ((*exec)(buf) != 1) {
1015                 return 0;
1016         }
1017         return 1;
1018 }
1019
1020 static int check(char *str) {
1021         return str != NULL;
1022 }
1023
1024 static int iface_up(struct interface_defn_t *iface)
1025 {
1026         if (!iface->method->up(iface,check)) return -1;
1027         set_environ(iface, "start");
1028         if (!execute_all(iface, doit, "pre-up")) return 0;
1029         if (!iface->method->up(iface, doit)) return 0;
1030         if (!execute_all(iface, doit, "up")) return 0;
1031         return 1;
1032 }
1033
1034 static int iface_down(struct interface_defn_t *iface)
1035 {
1036         if (!iface->method->down(iface,check)) return -1;
1037         set_environ(iface, "stop");
1038         if (!execute_all(iface, doit, "down")) return 0;
1039         if (!iface->method->down(iface, doit)) return 0;
1040         if (!execute_all(iface, doit, "post-down")) return 0;
1041         return 1;
1042 }
1043
1044 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1045 static int popen2(FILE **in, FILE **out, char *command, ...)
1046 {
1047         va_list ap;
1048         char *argv[11] = { command };
1049         int argc;
1050         int infd[2], outfd[2];
1051         pid_t pid;
1052
1053         argc = 1;
1054         va_start(ap, command);
1055         while ((argc < 10) && (argv[argc] = va_arg(ap, char *))) {
1056                 argc++;
1057         }
1058         argv[argc] = NULL;      /* make sure */
1059         va_end(ap);
1060
1061         if (pipe(infd) != 0) {
1062                 return 0;
1063         }
1064
1065         if (pipe(outfd) != 0) {
1066                 close(infd[0]);
1067                 close(infd[1]);
1068                 return 0;
1069         }
1070
1071         fflush(NULL);
1072         switch (pid = fork()) {
1073                 case -1:                        /* failure */
1074                         close(infd[0]);
1075                         close(infd[1]);
1076                         close(outfd[0]);
1077                         close(outfd[1]);
1078                         return 0;
1079                 case 0:                 /* child */
1080                         dup2(infd[0], 0);
1081                         dup2(outfd[1], 1);
1082                         close(infd[0]);
1083                         close(infd[1]);
1084                         close(outfd[0]);
1085                         close(outfd[1]);
1086                         execvp(command, argv);
1087                         exit(127);
1088                 default:                        /* parent */
1089                         *in = fdopen(infd[1], "w");
1090                         *out = fdopen(outfd[0], "r");
1091                         close(infd[0]);
1092                         close(outfd[1]);
1093                         return pid;
1094         }
1095         /* unreached */
1096 }
1097
1098 static char *run_mapping(char *physical, struct mapping_defn_t * map)
1099 {
1100         FILE *in, *out;
1101         int i, status;
1102         pid_t pid;
1103
1104         char *logical = bb_xstrdup(physical);
1105
1106         /* Run the mapping script. */
1107         pid = popen2(&in, &out, map->script, physical, NULL);
1108
1109         /* popen2() returns 0 on failure. */
1110         if (pid == 0)
1111                 return logical;
1112
1113         /* Write mappings to stdin of mapping script. */
1114         for (i = 0; i < map->n_mappings; i++) {
1115                 fprintf(in, "%s\n", map->mapping[i]);
1116         }
1117         fclose(in);
1118         waitpid(pid, &status, 0);
1119
1120         if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
1121                 /* If the mapping script exited successfully, try to
1122                  * grab a line of output and use that as the name of the
1123                  * logical interface. */
1124                 char *new_logical = (char *)xmalloc(MAX_INTERFACE_LENGTH);
1125
1126                 if (fgets(new_logical, MAX_INTERFACE_LENGTH, out)) {
1127                         /* If we are able to read a line of output from the script,
1128                          * remove any trailing whitespace and use this value
1129                          * as the name of the logical interface. */
1130                         char *pch = new_logical + bb_strlen(new_logical) - 1;
1131
1132                         while (pch >= new_logical && isspace(*pch))
1133                                 *(pch--) = '\0';
1134
1135                         free(logical);
1136                         logical = new_logical;
1137                 } else {
1138                         /* If we are UNABLE to read a line of output, discard are
1139                          * freshly allocated memory. */
1140                         free(new_logical);
1141                 }
1142         }
1143
1144         fclose(out);
1145
1146         return logical;
1147 }
1148 #endif /* CONFIG_FEATURE_IFUPDOWN_MAPPING */
1149
1150 static llist_t *find_iface_state(llist_t *state_list, const char *iface)
1151 {
1152         unsigned short iface_len = bb_strlen(iface);
1153         llist_t *search = state_list;
1154
1155         while (search) {
1156                 if ((strncmp(search->data, iface, iface_len) == 0) &&
1157                                 (search->data[iface_len] == '=')) {
1158                         return(search);
1159                 }
1160                 search = search->link;
1161         }
1162         return(NULL);
1163 }
1164
1165 extern int ifupdown_main(int argc, char **argv)
1166 {
1167         int (*cmds) (struct interface_defn_t *) = NULL;
1168         struct interfaces_file_t *defn;
1169         FILE *state_fp = NULL;
1170         llist_t *state_list = NULL;
1171         llist_t *target_list = NULL;
1172         const char *interfaces = "/etc/network/interfaces";
1173         const char *statefile = "/var/run/ifstate";
1174
1175 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1176         int run_mappings = 1;
1177 #endif
1178         int do_all = 0;
1179         int force = 0;
1180         int any_failures = 0;
1181         int i;
1182
1183         if (bb_applet_name[2] == 'u') {
1184                 /* ifup command */
1185                 cmds = iface_up;
1186         } else {
1187                 /* ifdown command */
1188                 cmds = iface_down;
1189         }
1190
1191 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1192         while ((i = getopt(argc, argv, "i:hvnamf")) != -1)
1193 #else
1194                 while ((i = getopt(argc, argv, "i:hvnaf")) != -1)
1195 #endif
1196                 {
1197                         switch (i) {
1198                                 case 'i':       /* interfaces */
1199                                         interfaces = optarg;
1200                                         break;
1201                                 case 'v':       /* verbose */
1202                                         verbose = 1;
1203                                         break;
1204                                 case 'a':       /* all */
1205                                         do_all = 1;
1206                                         break;
1207                                 case 'n':       /* no-act */
1208                                         no_act = 1;
1209                                         break;
1210 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1211                                 case 'm':       /* no-mappings */
1212                                         run_mappings = 0;
1213                                         break;
1214 #endif
1215                                 case 'f':       /* force */
1216                                         force = 1;
1217                                         break;
1218                                 default:
1219                                         bb_show_usage();
1220                                         break;
1221                         }
1222                 }
1223
1224         if (argc - optind > 0) {
1225                 if (do_all) {
1226                         bb_show_usage();
1227                 }
1228         } else {
1229                 if (!do_all) {
1230                         bb_show_usage();
1231                 }
1232         }
1233
1234         debug_noise("reading %s file:\n", interfaces);
1235         defn = read_interfaces(interfaces);
1236         debug_noise("\ndone reading %s\n\n", interfaces);
1237
1238         if (!defn) {
1239                 exit(EXIT_FAILURE);
1240         }
1241
1242         if (no_act) {
1243                 state_fp = fopen(statefile, "r");
1244         }
1245
1246         /* Create a list of interfaces to work on */
1247         if (do_all) {
1248                 if (cmds == iface_up) {
1249                         target_list = defn->autointerfaces;
1250                 } else {
1251 #if 0
1252                         /* iface_down */
1253                         llist_t *new_item;
1254                         const llist_t *list = state_list;
1255                         while (list) {
1256                                 new_item = xmalloc(sizeof(llist_t));
1257                                 new_item->data = strdup(list->data);
1258                                 new_item->link = NULL;
1259                                 list = target_list;
1260                                 if (list == NULL)
1261                                         target_list = new_item;
1262                                 else {
1263                                         while (list->link) {
1264                                                 list = list->link;
1265                                         }
1266                                         list = new_item;
1267                                 }
1268                                 list = list->link;
1269                         }
1270                         target_list = defn->autointerfaces;
1271 #else
1272
1273                         /* iface_down */
1274                         const llist_t *list = state_list;
1275                         while (list) {
1276                                 target_list = llist_add_to_end(target_list, strdup(list->data));
1277                                 list = list->link;
1278                         }
1279                         target_list = defn->autointerfaces;
1280 #endif
1281                 }
1282         } else {
1283                 target_list = llist_add_to_end(target_list, argv[optind]);
1284         }
1285
1286
1287         /* Update the interfaces */
1288         while (target_list) {
1289                 llist_t *iface_list;
1290                 struct interface_defn_t *currif;
1291                 char *iface;
1292                 char *liface;
1293                 char *pch;
1294                 int okay = 0;
1295                 int cmds_ret;
1296
1297                 iface = strdup(target_list->data);
1298                 target_list = target_list->link;
1299
1300                 pch = strchr(iface, '=');
1301                 if (pch) {
1302                         *pch = '\0';
1303                         liface = strdup(pch + 1);
1304                 } else {
1305                         liface = strdup(iface);
1306                 }
1307
1308                 if (!force) {
1309                         const llist_t *iface_state = find_iface_state(state_list, iface);
1310
1311                         if (cmds == iface_up) {
1312                                 /* ifup */
1313                                 if (iface_state) {
1314                                         bb_error_msg("interface %s already configured", iface);
1315                                         continue;
1316                                 }
1317                         } else {
1318                                 /* ifdown */
1319                                 if (iface_state) {
1320                                         bb_error_msg("interface %s not configured", iface);
1321                                         continue;
1322                                 }
1323                         }
1324                 }
1325
1326 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1327                 if ((cmds == iface_up) && run_mappings) {
1328                         struct mapping_defn_t *currmap;
1329
1330                         for (currmap = defn->mappings; currmap; currmap = currmap->next) {
1331
1332                                 for (i = 0; i < currmap->n_matches; i++) {
1333                                         if (fnmatch(currmap->match[i], liface, 0) != 0)
1334                                                 continue;
1335                                         if (verbose) {
1336                                                 printf("Running mapping script %s on %s\n", currmap->script, liface);
1337                                         }
1338                                         liface = run_mapping(iface, currmap);
1339                                         break;
1340                                 }
1341                         }
1342                 }
1343 #endif
1344
1345
1346                 iface_list = defn->ifaces;
1347                 while (iface_list) {
1348                         currif = (struct interface_defn_t *) iface_list->data;
1349                         if (strcmp(liface, currif->iface) == 0) {
1350                                 char *oldiface = currif->iface;
1351
1352                                 okay = 1;
1353                                 currif->iface = iface;
1354
1355                                 debug_noise("\nConfiguring interface %s (%s)\n", liface, currif->address_family->name);
1356
1357                                 /* Call the cmds function pointer, does either iface_up() or iface_down() */
1358                                 cmds_ret = cmds(currif);
1359                                 if (cmds_ret == -1) {
1360                                         bb_error_msg("Don't seem to have all the variables for %s/%s.",
1361                                                         liface, currif->address_family->name);
1362                                         any_failures += 1;
1363                                 } else if (cmds_ret == 0) {
1364                                         any_failures += 1;
1365                                 }
1366
1367                                 currif->iface = oldiface;
1368                         }
1369                         iface_list = iface_list->link;
1370                 }
1371                 if (verbose) {
1372                         printf("\n");
1373                 }
1374
1375                 if (!okay && !force) {
1376                         bb_error_msg("Ignoring unknown interface %s", liface);
1377                         any_failures += 1;
1378                 } else {
1379                         llist_t *iface_state = find_iface_state(state_list, iface);
1380
1381                         if (cmds == iface_up) {
1382                                 char *newiface = xmalloc(bb_strlen(iface) + 1 + bb_strlen(liface) + 1);
1383                                 sprintf(newiface, "%s=%s", iface, liface);
1384                                 if (iface_state == NULL) {
1385                                         state_list = llist_add_to_end(state_list, newiface);
1386                                 } else {
1387                                         free(iface_state->data);
1388                                         iface_state->data = newiface;
1389                                 }
1390                         } else if (cmds == iface_down) {
1391                                 /* Remove an interface from the linked list */
1392                                 if (iface_state) {
1393                                         /* This needs to be done better */
1394                                         free(iface_state->data);
1395                                         free(iface_state->link);
1396                                         if (iface_state->link) {
1397                                                 iface_state->data = iface_state->link->data;
1398                                                 iface_state->link = iface_state->link->link;
1399                                         } else {
1400                                                 iface_state->data = NULL;
1401                                                 iface_state->link = NULL;
1402                                         }
1403                                 }
1404                         }
1405                 }
1406         }
1407
1408         /* Actually write the new state */
1409         if (!no_act) {
1410
1411                 if (state_fp)
1412                         fclose(state_fp);
1413                 state_fp = bb_xfopen(statefile, "a+");
1414
1415                 if (ftruncate(fileno(state_fp), 0) < 0) {
1416                         bb_error_msg_and_die("failed to truncate statefile %s: %s", statefile, strerror(errno));
1417                 }
1418
1419                 rewind(state_fp);
1420
1421                 while (state_list) {
1422                         if (state_list->data) {
1423                                 fputs(state_list->data, state_fp);
1424                                 fputc('\n', state_fp);
1425                         }
1426                         state_list = state_list->link;
1427                 }
1428                 fflush(state_fp);
1429         }
1430
1431         /* Cleanup */
1432         if (state_fp != NULL) {
1433                 fclose(state_fp);
1434                 state_fp = NULL;
1435         }
1436
1437         if (any_failures)
1438                 return 1;
1439         return 0;
1440 }