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 extern llist_t *llist_add_to_end(llist_t *list_head, char *data)
  71 {
  72         llist_t *new_item, *tmp, *prev;
  73
  74         new_item = xmalloc(sizeof(llist_t));
  75         new_item->data = data;
  76         new_item->link = NULL;
  77
  78         prev = NULL;
  79         tmp = list_head;
  80         while(tmp) {
  81                 prev = tmp;
  82                 tmp = tmp->link;
  83         }
  84         if (prev) {
  85                 prev->link = new_item;
  86         } else {
  87                 list_head = new_item;
  88         }
  89
  90         return(list_head);
  91 }
  92
  93 struct method_t
  94 {
  95         char *name;
  96         command_set *up;
  97         command_set *down;
  98 };
  99
 100 struct address_family_t
 101 {
 102         char *name;
 103         int n_methods;
 104         struct method_t *method;
 105 };
 106
 107 struct mapping_defn_t
 108 {
 109         struct mapping_defn_t *next;
 110
 111         int max_matches;
 112         int n_matches;
 113         char **match;
 114
 115         char *script;
 116
 117         int max_mappings;
 118         int n_mappings;
 119         char **mapping;
 120 };
 121
 122 struct variable_t
 123 {
 124         char *name;
 125         char *value;
 126 };
 127
 128 struct interface_defn_t
 129 {
 130         struct interface_defn_t *prev;
 131         struct interface_defn_t *next;
 132
 133         char *iface;
 134         struct address_family_t *address_family;
 135         struct method_t *method;
 136
 137         int automatic;
 138
 139         int max_options;
 140         int n_options;
 141         struct variable_t *option;
 142 };
 143
 144 struct interfaces_file_t
 145 {
 146         llist_t *autointerfaces;
 147         llist_t *ifaces;
 148         struct mapping_defn_t *mappings;
 149 };
 150
 151 static char no_act = 0;
 152 static char verbose = 0;
 153 static char **environ = NULL;
 154
 155 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 156
 157 static unsigned int count_bits(unsigned int a)
 158 {
 159         unsigned int result;
 160         result = (a & 0x55) + ((a >> 1) & 0x55);
 161         result = (result & 0x33) + ((result >> 2) & 0x33);
 162         return((result & 0x0F) + ((result >> 4) & 0x0F));
 163 }
 164
 165 static int count_netmask_bits(char *dotted_quad)
 166 {
 167         unsigned int result, a, b, c, d;
 168         /* Found a netmask...  Check if it is dotted quad */
 169         if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) != 4)
 170                 return -1;
 171         result = count_bits(a);
 172         result += count_bits(b);
 173         result += count_bits(c);
 174         result += count_bits(d);
 175         return ((int)result);
 176 }
 177 #endif
 178
 179 static void addstr(char **buf, size_t *len, size_t *pos, char *str, size_t str_length)
 180 {
 181         if (*pos + str_length >= *len) {
 182                 char *newbuf;
 183
 184                 newbuf = xrealloc(*buf, *len * 2 + str_length + 1);
 185                 *buf = newbuf;
 186                 *len = *len * 2 + str_length + 1;
 187         }
 188
 189         while (str_length-- >= 1) {
 190                 (*buf)[(*pos)++] = *str;
 191                 str++;
 192         }
 193         (*buf)[*pos] = '\0';
 194 }
 195
 196 static int strncmpz(char *l, char *r, size_t llen)
 197 {
 198         int i = strncmp(l, r, llen);
 199
 200         if (i == 0) {
 201                 return(-r[llen]);
 202         } else {
 203                 return(i);
 204         }
 205 }
 206
 207 static char *get_var(char *id, size_t idlen, struct interface_defn_t *ifd)
 208 {
 209         int i;
 210
 211         if (strncmpz(id, "iface", idlen) == 0) {
 212                 char *result;
 213                 static char label_buf[20];
 214                 strncpy(label_buf, ifd->iface, 19);
 215                 label_buf[19]=0;
 216                 result = strchr(label_buf, ':');
 217                 if (result) {
 218                         *result=0;
 219                 }
 220                 return( label_buf);
 221         } else if (strncmpz(id, "label", idlen) == 0) {
 222                 return (ifd->iface);
 223         } else {
 224                 for (i = 0; i < ifd->n_options; i++) {
 225                         if (strncmpz(id, ifd->option[i].name, idlen) == 0) {
 226                                 return (ifd->option[i].value);
 227                         }
 228                 }
 229         }
 230
 231         return(NULL);
 232 }
 233
 234 static char *parse(char *command, struct interface_defn_t *ifd)
 235 {
 236
 237         char *result = NULL;
 238         size_t pos = 0, len = 0;
 239         size_t old_pos[MAX_OPT_DEPTH] = { 0 };
 240         int okay[MAX_OPT_DEPTH] = { 1 };
 241         int opt_depth = 1;
 242
 243         while (*command) {
 244                 switch (*command) {
 245
 246                         default:
 247                                 addstr(&result, &len, &pos, command, 1);
 248                                 command++;
 249                                 break;
 250                         case '\\':
 251                                 if (command[1]) {
 252                                         addstr(&result, &len, &pos, command + 1, 1);
 253                                         command += 2;
 254                                 } else {
 255                                         addstr(&result, &len, &pos, command, 1);
 256                                         command++;
 257                                 }
 258                                 break;
 259                         case '[':
 260                                 if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) {
 261                                         old_pos[opt_depth] = pos;
 262                                         okay[opt_depth] = 1;
 263                                         opt_depth++;
 264                                         command += 2;
 265                                 } else {
 266                                         addstr(&result, &len, &pos, "[", 1);
 267                                         command++;
 268                                 }
 269                                 break;
 270                         case ']':
 271                                 if (command[1] == ']' && opt_depth > 1) {
 272                                         opt_depth--;
 273                                         if (!okay[opt_depth]) {
 274                                                 pos = old_pos[opt_depth];
 275                                                 result[pos] = '\0';
 276                                         }
 277                                         command += 2;
 278                                 } else {
 279                                         addstr(&result, &len, &pos, "]", 1);
 280                                         command++;
 281                                 }
 282                                 break;
 283                         case '%':
 284                                 {
 285                                         char *nextpercent;
 286                                         char *varvalue;
 287
 288                                         command++;
 289                                         nextpercent = strchr(command, '%');
 290                                         if (!nextpercent) {
 291                                                 errno = EUNBALPER;
 292                                                 free(result);
 293                                                 return (NULL);
 294                                         }
 295
 296                                         varvalue = get_var(command, nextpercent - command, ifd);
 297
 298                                         if (varvalue) {
 299                                                 addstr(&result, &len, &pos, varvalue, bb_strlen(varvalue));
 300                                         } else {
 301 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 302                                                 /* Sigh...  Add a special case for 'ip' to convert from
 303                                                  * dotted quad to bit count style netmasks.  */
 304                                                 if (strncmp(command, "bnmask", 6)==0) {
 305                                                         int res;
 306                                                         varvalue = get_var("netmask", 7, ifd);
 307                                                         if (varvalue && (res=count_netmask_bits(varvalue)) > 0) {
 308                                                                 char argument[255];
 309                                                                 sprintf(argument, "%d", res);
 310                                                                 addstr(&result, &len, &pos, argument, bb_strlen(argument));
 311                                                                 command = nextpercent + 1;
 312                                                                 break;
 313                                                         }
 314                                                 }
 315 #endif
 316                                                 okay[opt_depth - 1] = 0;
 317                                         }
 318
 319                                         command = nextpercent + 1;
 320                                 }
 321                                 break;
 322                 }
 323         }
 324
 325         if (opt_depth > 1) {
 326                 errno = EUNBALBRACK;
 327                 free(result);
 328                 return(NULL);
 329         }
 330
 331         if (!okay[0]) {
 332                 errno = EUNDEFVAR;
 333                 free(result);
 334                 return(NULL);
 335         }
 336
 337         return(result);
 338 }
 339
 340 static int execute(char *command, struct interface_defn_t *ifd, execfn *exec)
 341 {
 342         char *out;
 343         int ret;
 344
 345         out = parse(command, ifd);
 346         if (!out) {
 347                 return(0);
 348         }
 349         ret = (*exec) (out);
 350
 351         free(out);
 352         if (ret != 1) {
 353                 return(0);
 354         }
 355         return(1);
 356 }
 357
 358 #ifdef CONFIG_FEATURE_IFUPDOWN_IPX
 359 static int static_up_ipx(struct interface_defn_t *ifd, execfn *exec)
 360 {
 361         return(execute("ipx_interface add %iface% %frame% %netnum%", ifd, exec));
 362 }
 363
 364 static int static_down_ipx(struct interface_defn_t *ifd, execfn *exec)
 365 {
 366         return(execute("ipx_interface del %iface% %frame%", ifd, exec));
 367 }
 368
 369 static int dynamic_up(struct interface_defn_t *ifd, execfn *exec)
 370 {
 371         return(execute("ipx_interface add %iface% %frame%", ifd, exec));
 372 }
 373
 374 static int dynamic_down(struct interface_defn_t *ifd, execfn *exec)
 375 {
 376         return(execute("ipx_interface del %iface% %frame%", ifd, exec));
 377 }
 378
 379 static struct method_t methods_ipx[] = {
 380         { "dynamic", dynamic_up, dynamic_down, },
 381         { "static", static_up_ipx, static_down_ipx, },
 382 };
 383
 384 struct address_family_t addr_ipx = {
 385         "ipx",
 386         sizeof(methods_ipx) / sizeof(struct method_t),
 387         methods_ipx
 388 };
 389 #endif /* IFUP_FEATURE_IPX */
 390
 391 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
 392 static int loopback_up6(struct interface_defn_t *ifd, execfn *exec)
 393 {
 394 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 395         int result;
 396         result =execute("ip addr add ::1 dev %iface%", ifd, exec);
 397         result += execute("ip link set %iface% up", ifd, exec);
 398         return ((result == 2) ? 2 : 0);
 399 #else
 400         return( execute("ifconfig %iface% add ::1", ifd, exec));
 401 #endif
 402 }
 403
 404 static int loopback_down6(struct interface_defn_t *ifd, execfn *exec)
 405 {
 406 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 407         return(execute("ip link set %iface% down", ifd, exec));
 408 #else
 409         return(execute("ifconfig %iface% del ::1", ifd, exec));
 410 #endif
 411 }
 412
 413 static int static_up6(struct interface_defn_t *ifd, execfn *exec)
 414 {
 415         int result;
 416 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 417         result = execute("ip addr add %address%/%netmask% dev %iface% [[label %label%]]", ifd, exec);
 418         result += execute("ip link set [[mtu %mtu%]] [[address %hwaddress%]] %iface% up", ifd, exec);
 419         result += execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec);
 420 #else
 421         result = execute("ifconfig %iface% [[media %media%]] [[hw %hwaddress%]] [[mtu %mtu%]] up", ifd, exec);
 422         result += execute("ifconfig %iface% add %address%/%netmask%", ifd, exec);
 423         result += execute("[[ route -A inet6 add ::/0 gw %gateway% ]]", ifd, exec);
 424 #endif
 425         return ((result == 3) ? 3 : 0);
 426 }
 427
 428 static int static_down6(struct interface_defn_t *ifd, execfn *exec)
 429 {
 430 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 431         return(execute("ip link set %iface% down", ifd, exec));
 432 #else
 433         return(execute("ifconfig %iface% down", ifd, exec));
 434 #endif
 435 }
 436
 437 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 438 static int v4tunnel_up(struct interface_defn_t *ifd, execfn *exec)
 439 {
 440         int result;
 441         result = execute("ip tunnel add %iface% mode sit remote "
 442                                 "%endpoint% [[local %local%]] [[ttl %ttl%]]", ifd, exec);
 443         result += execute("ip link set %iface% up", ifd, exec);
 444         result += execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec);
 445         result += execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec);
 446         return ((result == 4) ? 4 : 0);
 447 }
 448
 449 static int v4tunnel_down(struct interface_defn_t * ifd, execfn * exec)
 450 {
 451         return( execute("ip tunnel del %iface%", ifd, exec));
 452 }
 453 #endif
 454
 455 static struct method_t methods6[] = {
 456 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 457         { "v4tunnel", v4tunnel_up, v4tunnel_down, },
 458 #endif
 459         { "static", static_up6, static_down6, },
 460         { "loopback", loopback_up6, loopback_down6, },
 461 };
 462
 463 struct address_family_t addr_inet6 = {
 464         "inet6",
 465         sizeof(methods6) / sizeof(struct method_t),
 466         methods6
 467 };
 468 #endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */
 469
 470 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
 471 static int loopback_up(struct interface_defn_t *ifd, execfn *exec)
 472 {
 473 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 474         int result;
 475         result = execute("ip addr add 127.0.0.1/8 dev %iface%", ifd, exec);
 476         result += execute("ip link set %iface% up", ifd, exec);
 477         return ((result == 2) ? 2 : 0);
 478 #else
 479         return( execute("ifconfig %iface% 127.0.0.1 up", ifd, exec));
 480 #endif
 481 }
 482
 483 static int loopback_down(struct interface_defn_t *ifd, execfn *exec)
 484 {
 485 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 486         int result;
 487         result = execute("ip addr flush dev %iface%", ifd, exec);
 488         result += execute("ip link set %iface% down", ifd, exec);
 489         return ((result == 2) ? 2 : 0);
 490 #else
 491         return( execute("ifconfig %iface% 127.0.0.1 down", ifd, exec));
 492 #endif
 493 }
 494
 495 static int static_up(struct interface_defn_t *ifd, execfn *exec)
 496 {
 497         int result;
 498 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 499         result = execute("ip addr add %address%/%bnmask% [[broadcast %broadcast%]] "
 500                         "dev %iface% [[peer %pointopoint%]] [[label %label%]]", ifd, exec);
 501         result += execute("ip link set [[mtu %mtu%]] [[address %hwaddress%]] %iface% up", ifd, exec);
 502         result += execute("[[ ip route add default via %gateway% dev %iface% ]]", ifd, exec);
 503         return ((result == 3) ? 3 : 0);
 504 #else
 505         result = execute("ifconfig %iface% %address% netmask %netmask% "
 506                                 "[[broadcast %broadcast%]]      [[pointopoint %pointopoint%]] "
 507                                 "[[media %media%]] [[mtu %mtu%]]        [[hw %hwaddress%]] up",
 508                                 ifd, exec);
 509         result += execute("[[ route add default gw %gateway% %iface% ]]", ifd, exec);
 510         return ((result == 2) ? 2 : 0);
 511 #endif
 512 }
 513
 514 static int static_down(struct interface_defn_t *ifd, execfn *exec)
 515 {
 516         int result;
 517 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 518         result = execute("ip addr flush dev %iface%", ifd, exec);
 519         result += execute("ip link set %iface% down", ifd, exec);
 520 #else
 521         result = execute("[[ route del default gw %gateway% %iface% ]]", ifd, exec);
 522         result += execute("ifconfig %iface% down", ifd, exec);
 523 #endif
 524         return ((result == 2) ? 2 : 0);
 525 }
 526
 527 static int execable(char *program)
 528 {
 529         struct stat buf;
 530         if (0 == stat(program, &buf)) {
 531                 if (S_ISREG(buf.st_mode) && (S_IXUSR & buf.st_mode)) {
 532                         return(1);
 533                 }
 534         }
 535         return(0);
 536 }
 537
 538 static int dhcp_up(struct interface_defn_t *ifd, execfn *exec)
 539 {
 540         if (execable("/sbin/udhcpc")) {
 541                 return( execute("udhcpc -n -p /var/run/udhcpc.%iface%.pid -i "
 542                                         "%iface% [[-H %hostname%]] [[-c %clientid%]]", ifd, exec));
 543         } else if (execable("/sbin/pump")) {
 544                 return( execute("pump -i %iface% [[-h %hostname%]] [[-l %leasehours%]]", ifd, exec));
 545         } else if (execable("/sbin/dhclient")) {
 546                 return( execute("dhclient -pf /var/run/dhclient.%iface%.pid %iface%", ifd, exec));
 547         } else if (execable("/sbin/dhcpcd")) {
 548                 return( execute("dhcpcd [[-h %hostname%]] [[-i %vendor%]] [[-I %clientid%]] "
 549                                         "[[-l %leasetime%]] %iface%", ifd, exec));
 550         }
 551         return(0);
 552 }
 553
 554 static int dhcp_down(struct interface_defn_t *ifd, execfn *exec)
 555 {
 556         int result = 0;
 557         if (execable("/sbin/udhcpc")) {
 558                 /* SIGUSR2 forces udhcpc to release the current lease and go inactive,
 559                  * and SIGTERM causes udhcpc to exit.  Signals are queued and processed
 560                  * sequentially so we don't need to sleep */
 561                 result = execute("kill -USR2 `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec);
 562                 result += execute("kill -TERM `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec);
 563         } else if (execable("/sbin/pump")) {
 564                 result = execute("pump -i %iface% -k", ifd, exec);
 565         } else if (execable("/sbin/dhclient")) {
 566                 result = execute("kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null", ifd, exec);
 567         } else if (execable("/sbin/dhcpcd")) {
 568                 result = execute("dhcpcd -k %iface%", ifd, exec);
 569         }
 570         return (result || static_down(ifd, exec));
 571 }
 572
 573 static int bootp_up(struct interface_defn_t *ifd, execfn *exec)
 574 {
 575         return( execute("bootpc [[--bootfile %bootfile%]] --dev %iface% "
 576                                 "[[--server %server%]] [[--hwaddr %hwaddr%]] "
 577                                 "--returniffail --serverbcast", ifd, exec));
 578 }
 579
 580 static int ppp_up(struct interface_defn_t *ifd, execfn *exec)
 581 {
 582         return( execute("pon [[%provider%]]", ifd, exec));
 583 }
 584
 585 static int ppp_down(struct interface_defn_t *ifd, execfn *exec)
 586 {
 587         return( execute("poff [[%provider%]]", ifd, exec));
 588 }
 589
 590 static int wvdial_up(struct interface_defn_t *ifd, execfn *exec)
 591 {
 592         return( execute("/sbin/start-stop-daemon --start -x /usr/bin/wvdial "
 593                                 "-p /var/run/wvdial.%iface% -b -m -- [[ %provider% ]]", ifd, exec));
 594 }
 595
 596 static int wvdial_down(struct interface_defn_t *ifd, execfn *exec)
 597 {
 598         return( execute("/sbin/start-stop-daemon --stop -x /usr/bin/wvdial "
 599                                 "-p /var/run/wvdial.%iface% -s 2", ifd, exec));
 600 }
 601
 602 static struct method_t methods[] =
 603 {
 604         { "wvdial", wvdial_up, wvdial_down, },
 605         { "ppp", ppp_up, ppp_down, },
 606         { "static", static_up, static_down, },
 607         { "bootp", bootp_up, static_down, },
 608         { "dhcp", dhcp_up, dhcp_down, },
 609         { "loopback", loopback_up, loopback_down, },
 610 };
 611
 612 struct address_family_t addr_inet =
 613 {
 614         "inet",
 615         sizeof(methods) / sizeof(struct method_t),
 616         methods
 617 };
 618
 619 #endif  /* ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 */
 620
 621 static char *next_word(char **buf)
 622 {
 623         unsigned short length;
 624         char *word;
 625
 626         if ((buf == NULL) || (*buf == NULL) || (**buf == '\0')) {
 627                 return NULL;
 628         }
 629
 630         /* Skip over leading whitespace */
 631         word = *buf;
 632         while (isspace(*word)) {
 633                 ++word;
 634         }
 635
 636         /* Skip over comments */
 637         if (*word == '#') {
 638                 return(NULL);
 639         }
 640
 641         /* Find the length of this word */
 642         length = strcspn(word, " \t\n");
 643         if (length == 0) {
 644                 return(NULL);
 645         }
 646         *buf = word + length;
 647         /*DBU:[dave@cray.com] if we are already at EOL dont't increment beyond it */
 648         if (**buf) {
 649                 **buf = '\0';
 650                 (*buf)++;
 651         }
 652
 653         return word;
 654 }
 655
 656 static struct address_family_t *get_address_family(struct address_family_t *af[], char *name)
 657 {
 658         int i;
 659
 660         for (i = 0; af[i]; i++) {
 661                 if (strcmp(af[i]->name, name) == 0) {
 662                         return af[i];
 663                 }
 664         }
 665         return NULL;
 666 }
 667
 668 static struct method_t *get_method(struct address_family_t *af, char *name)
 669 {
 670         int i;
 671
 672         for (i = 0; i < af->n_methods; i++) {
 673                 if (strcmp(af->method[i].name, name) == 0) {
 674                         return &af->method[i];
 675                 }
 676         }
 677         return(NULL);
 678 }
 679
 680 static int duplicate_if(struct interface_defn_t *ifa, struct interface_defn_t *ifb)
 681 {
 682         if (strcmp(ifa->iface, ifb->iface) != 0) {
 683                 return(0);
 684         }
 685         if (ifa->address_family != ifb->address_family) {
 686                 return(0);
 687         }
 688         return(1);
 689 }
 690
 691 static const llist_t *find_list_string(const llist_t *list, const char *string)
 692 {
 693         while (list) {
 694                 if (strcmp(list->data, string) == 0) {
 695                         return(list);
 696                 }
 697                 list = list->link;
 698         }
 699         return(NULL);
 700 }
 701
 702 static struct interfaces_file_t *read_interfaces(const char *filename)
 703 {
 704 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 705         struct mapping_defn_t *currmap = NULL;
 706 #endif
 707         struct interface_defn_t *currif = NULL;
 708         struct interfaces_file_t *defn;
 709         FILE *f;
 710         char *firstword;
 711         char *buf;
 712
 713         enum { NONE, IFACE, MAPPING } currently_processing = NONE;
 714
 715         defn = xmalloc(sizeof(struct interfaces_file_t));
 716         defn->autointerfaces = NULL;
 717         defn->mappings = NULL;
 718         defn->ifaces = NULL;
 719
 720         f = bb_xfopen(filename, "r");
 721
 722         while ((buf = bb_get_chomped_line_from_file(f)) != NULL) {
 723                 char *buf_ptr = buf;
 724
 725                 firstword = next_word(&buf_ptr);
 726                 if (firstword == NULL) {
 727                         free(buf);
 728                         continue;       /* blank line */
 729                 }
 730
 731                 if (strcmp(firstword, "mapping") == 0) {
 732 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 733                         currmap = xmalloc(sizeof(struct mapping_defn_t));
 734                         currmap->max_matches = 0;
 735                         currmap->n_matches = 0;
 736                         currmap->match = NULL;
 737
 738                         while ((firstword = next_word(&buf_ptr)) != NULL) {
 739                                 if (currmap->max_matches == currmap->n_matches) {
 740                                         currmap->max_matches = currmap->max_matches * 2 + 1;
 741                                         currmap->match = xrealloc(currmap->match, sizeof(currmap->match) * currmap->max_matches);
 742                                 }
 743
 744                                 currmap->match[currmap->n_matches++] = bb_xstrdup(firstword);
 745                         }
 746                         currmap->max_mappings = 0;
 747                         currmap->n_mappings = 0;
 748                         currmap->mapping = NULL;
 749                         currmap->script = NULL;
 750                         {
 751                                 struct mapping_defn_t **where = &defn->mappings;
 752                                 while (*where != NULL) {
 753                                         where = &(*where)->next;
 754                                 }
 755                                 *where = currmap;
 756                                 currmap->next = NULL;
 757                         }
 758                         debug_noise("Added mapping\n");
 759 #endif
 760                         currently_processing = MAPPING;
 761                 } else if (strcmp(firstword, "iface") == 0) {
 762                         {
 763                                 char *iface_name;
 764                                 char *address_family_name;
 765                                 char *method_name;
 766                                 struct address_family_t *addr_fams[] = {
 767 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
 768                                         &addr_inet,
 769 #endif
 770 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
 771                                         &addr_inet6,
 772 #endif
 773 #ifdef CONFIG_FEATURE_IFUPDOWN_IPX
 774                                         &addr_ipx,
 775 #endif
 776                                         NULL
 777                                 };
 778
 779                                 currif = xmalloc(sizeof(struct interface_defn_t));
 780                                 iface_name = next_word(&buf_ptr);
 781                                 address_family_name = next_word(&buf_ptr);
 782                                 method_name = next_word(&buf_ptr);
 783
 784                                 if (buf_ptr == NULL) {
 785                                         bb_error_msg("too few parameters for line \"%s\"", buf);
 786                                         return NULL;
 787                                 }
 788
 789                                 /* ship any trailing whitespace */
 790                                 while (isspace(*buf_ptr)) {
 791                                         ++buf_ptr;
 792                                 }
 793
 794                                 if (buf_ptr[0] != '\0') {
 795                                         bb_error_msg("too many parameters \"%s\"", buf);
 796                                         return NULL;
 797                                 }
 798
 799                                 currif->iface = bb_xstrdup(iface_name);
 800
 801                                 currif->address_family = get_address_family(addr_fams, address_family_name);
 802                                 if (!currif->address_family) {
 803                                         bb_error_msg("unknown address type \"%s\"", address_family_name);
 804                                         return NULL;
 805                                 }
 806
 807                                 currif->method = get_method(currif->address_family, method_name);
 808                                 if (!currif->method) {
 809                                         bb_error_msg("unknown method \"%s\"", method_name);
 810                                         return NULL;
 811                                 }
 812
 813                                 currif->automatic = 1;
 814                                 currif->max_options = 0;
 815                                 currif->n_options = 0;
 816                                 currif->option = NULL;
 817
 818                                 {
 819                                         struct interface_defn_t *tmp;
 820                                         llist_t *iface_list;
 821                                         iface_list = defn->ifaces;
 822                                         while (iface_list) {
 823                                                 tmp = (struct interface_defn_t *) iface_list->data;
 824                                                 if (duplicate_if(tmp, currif)) {
 825                                                         bb_error_msg("duplicate interface \"%s\"", tmp->iface);
 826                                                         return NULL;
 827                                                 }
 828                                                 iface_list = iface_list->link;
 829                                         }
 830
 831                                         defn->ifaces = llist_add_to_end(defn->ifaces, (char*)currif);
 832                                 }
 833                                 debug_noise("iface %s %s %s\n", currif->iface, address_family_name, method_name);
 834                         }
 835                         currently_processing = IFACE;
 836                 } else if (strcmp(firstword, "auto") == 0) {
 837                         while ((firstword = next_word(&buf_ptr)) != NULL) {
 838
 839                                 /* Check the interface isnt already listed */
 840                                 if (find_list_string(defn->autointerfaces, firstword)) {
 841                                         bb_perror_msg_and_die("interface declared auto twice \"%s\"", buf);
 842                                 }
 843
 844                                 /* Add the interface to the list */
 845                                 defn->autointerfaces = llist_add_to_end(defn->autointerfaces, strdup(firstword));
 846                                 debug_noise("\nauto %s\n", firstword);
 847                         }
 848                         currently_processing = NONE;
 849                 } else {
 850                         switch (currently_processing) {
 851                                 case IFACE:
 852                                         {
 853                                                 int i;
 854
 855                                                 if (bb_strlen(buf_ptr) == 0) {
 856                                                         bb_error_msg("option with empty value \"%s\"", buf);
 857                                                         return NULL;
 858                                                 }
 859
 860                                                 if (strcmp(firstword, "up") != 0
 861                                                                 && strcmp(firstword, "down") != 0
 862                                                                 && strcmp(firstword, "pre-up") != 0
 863                                                                 && strcmp(firstword, "post-down") != 0) {
 864                                                         for (i = 0; i < currif->n_options; i++) {
 865                                                                 if (strcmp(currif->option[i].name, firstword) == 0) {
 866                                                                         bb_error_msg("duplicate option \"%s\"", buf);
 867                                                                         return NULL;
 868                                                                 }
 869                                                         }
 870                                                 }
 871                                         }
 872                                         if (currif->n_options >= currif->max_options) {
 873                                                 struct variable_t *opt;
 874
 875                                                 currif->max_options = currif->max_options + 10;
 876                                                 opt = xrealloc(currif->option, sizeof(*opt) * currif->max_options);
 877                                                 currif->option = opt;
 878                                         }
 879                                         currif->option[currif->n_options].name = bb_xstrdup(firstword);
 880                                         currif->option[currif->n_options].value = bb_xstrdup(buf_ptr);
 881                                         if (!currif->option[currif->n_options].name) {
 882                                                 perror(filename);
 883                                                 return NULL;
 884                                         }
 885                                         if (!currif->option[currif->n_options].value) {
 886                                                 perror(filename);
 887                                                 return NULL;
 888                                         }
 889                                         debug_noise("\t%s=%s\n", currif->option[currif->n_options].name,
 890                                                         currif->option[currif->n_options].value);
 891                                         currif->n_options++;
 892                                         break;
 893                                 case MAPPING:
 894 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 895                                         if (strcmp(firstword, "script") == 0) {
 896                                                 if (currmap->script != NULL) {
 897                                                         bb_error_msg("duplicate script in mapping \"%s\"", buf);
 898                                                         return NULL;
 899                                                 } else {
 900                                                         currmap->script = bb_xstrdup(next_word(&buf_ptr));
 901                                                 }
 902                                         } else if (strcmp(firstword, "map") == 0) {
 903                                                 if (currmap->max_mappings == currmap->n_mappings) {
 904                                                         currmap->max_mappings = currmap->max_mappings * 2 + 1;
 905                                                         currmap->mapping = xrealloc(currmap->mapping, sizeof(char *) * currmap->max_mappings);
 906                                                 }
 907                                                 currmap->mapping[currmap->n_mappings] = bb_xstrdup(next_word(&buf_ptr));
 908                                                 currmap->n_mappings++;
 909                                         } else {
 910                                                 bb_error_msg("misplaced option \"%s\"", buf);
 911                                                 return NULL;
 912                                         }
 913 #endif
 914                                         break;
 915                                 case NONE:
 916                                 default:
 917                                         bb_error_msg("misplaced option \"%s\"", buf);
 918                                         return NULL;
 919                         }
 920                 }
 921                 free(buf);
 922         }
 923         if (ferror(f) != 0) {
 924                 bb_perror_msg_and_die("%s", filename);
 925         }
 926         fclose(f);
 927
 928         return defn;
 929 }
 930
 931 static char *setlocalenv(char *format, char *name, char *value)
 932 {
 933         char *result;
 934         char *here;
 935         char *there;
 936
 937         result = xmalloc(bb_strlen(format) + bb_strlen(name) + bb_strlen(value) + 1);
 938
 939         sprintf(result, format, name, value);
 940
 941         for (here = there = result; *there != '=' && *there; there++) {
 942                 if (*there == '-')
 943                         *there = '_';
 944                 if (isalpha(*there))
 945                         *there = toupper(*there);
 946
 947                 if (isalnum(*there) || *there == '_') {
 948                         *here = *there;
 949                         here++;
 950                 }
 951         }
 952         memmove(here, there, bb_strlen(there) + 1);
 953
 954         return result;
 955 }
 956
 957 static void set_environ(struct interface_defn_t *iface, char *mode)
 958 {
 959         char **environend;
 960         int i;
 961         const int n_env_entries = iface->n_options + 5;
 962         char **ppch;
 963
 964         if (environ != NULL) {
 965                 for (ppch = environ; *ppch; ppch++) {
 966                         free(*ppch);
 967                         *ppch = NULL;
 968                 }
 969                 free(environ);
 970                 environ = NULL;
 971         }
 972         environ = xmalloc(sizeof(char *) * (n_env_entries + 1 /* for final NULL */ ));
 973         environend = environ;
 974         *environend = NULL;
 975
 976         for (i = 0; i < iface->n_options; i++) {
 977                 if (strcmp(iface->option[i].name, "up") == 0
 978                                 || strcmp(iface->option[i].name, "down") == 0
 979                                 || strcmp(iface->option[i].name, "pre-up") == 0
 980                                 || strcmp(iface->option[i].name, "post-down") == 0) {
 981                         continue;
 982                 }
 983                 *(environend++) = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value);
 984                 *environend = NULL;
 985         }
 986
 987         *(environend++) = setlocalenv("%s=%s", "IFACE", iface->iface);
 988         *environend = NULL;
 989         *(environend++) = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name);
 990         *environend = NULL;
 991         *(environend++) = setlocalenv("%s=%s", "METHOD", iface->method->name);
 992         *environend = NULL;
 993         *(environend++) = setlocalenv("%s=%s", "MODE", mode);
 994         *environend = NULL;
 995         *(environend++) = setlocalenv("%s=%s", "PATH", "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin");
 996         *environend = NULL;
 997 }
 998
 999 static int doit(char *str)
1000 {
1001         if (verbose || no_act) {
1002                 printf("%s\n", str);
1003         }
1004         if (!no_act) {
1005                 pid_t child;
1006                 int status;
1007
1008                 fflush(NULL);
1009                 switch (child = fork()) {
1010                         case -1:                /* failure */
1011                                 return 0;
1012                         case 0:         /* child */
1013                                 execle(DEFAULT_SHELL, DEFAULT_SHELL, "-c", str, NULL, environ);
1014                                 exit(127);
1015                 }
1016                 waitpid(child, &status, 0);
1017                 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
1018                         return 0;
1019                 }
1020         }
1021         return (1);
1022 }
1023
1024 static int execute_all(struct interface_defn_t *ifd, execfn *exec, const char *opt)
1025 {
1026         int i;
1027         char *buf;
1028         for (i = 0; i < ifd->n_options; i++) {
1029                 if (strcmp(ifd->option[i].name, opt) == 0) {
1030                         if (!(*exec) (ifd->option[i].value)) {
1031                                 return 0;
1032                         }
1033                 }
1034         }
1035
1036         bb_xasprintf(&buf, "run-parts /etc/network/if-%s.d", opt);
1037         if ((*exec)(buf) != 1) {
1038                 return 0;
1039         }
1040         return 1;
1041 }
1042
1043 static int check(char *str) {
1044         return str != NULL;
1045 }
1046
1047 static int iface_up(struct interface_defn_t *iface)
1048 {
1049         if (!iface->method->up(iface,check)) return -1;
1050         set_environ(iface, "start");
1051         if (!execute_all(iface, doit, "pre-up")) return 0;
1052         if (!iface->method->up(iface, doit)) return 0;
1053         if (!execute_all(iface, doit, "up")) return 0;
1054         return 1;
1055 }
1056
1057 static int iface_down(struct interface_defn_t *iface)
1058 {
1059         if (!iface->method->down(iface,check)) return -1;
1060         set_environ(iface, "stop");
1061         if (!execute_all(iface, doit, "down")) return 0;
1062         if (!iface->method->down(iface, doit)) return 0;
1063         if (!execute_all(iface, doit, "post-down")) return 0;
1064         return 1;
1065 }
1066
1067 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1068 static int popen2(FILE **in, FILE **out, char *command, ...)
1069 {
1070         va_list ap;
1071         char *argv[11] = { command };
1072         int argc;
1073         int infd[2], outfd[2];
1074         pid_t pid;
1075
1076         argc = 1;
1077         va_start(ap, command);
1078         while ((argc < 10) && (argv[argc] = va_arg(ap, char *))) {
1079                 argc++;
1080         }
1081         argv[argc] = NULL;      /* make sure */
1082         va_end(ap);
1083
1084         if (pipe(infd) != 0) {
1085                 return 0;
1086         }
1087
1088         if (pipe(outfd) != 0) {
1089                 close(infd[0]);
1090                 close(infd[1]);
1091                 return 0;
1092         }
1093
1094         fflush(NULL);
1095         switch (pid = fork()) {
1096                 case -1:                        /* failure */
1097                         close(infd[0]);
1098                         close(infd[1]);
1099                         close(outfd[0]);
1100                         close(outfd[1]);
1101                         return 0;
1102                 case 0:                 /* child */
1103                         dup2(infd[0], 0);
1104                         dup2(outfd[1], 1);
1105                         close(infd[0]);
1106                         close(infd[1]);
1107                         close(outfd[0]);
1108                         close(outfd[1]);
1109                         execvp(command, argv);
1110                         exit(127);
1111                 default:                        /* parent */
1112                         *in = fdopen(infd[1], "w");
1113                         *out = fdopen(outfd[0], "r");
1114                         close(infd[0]);
1115                         close(outfd[1]);
1116                         return pid;
1117         }
1118         /* unreached */
1119 }
1120
1121 static char *run_mapping(char *physical, struct mapping_defn_t * map)
1122 {
1123         FILE *in, *out;
1124         int i, status;
1125         pid_t pid;
1126
1127         char *logical = bb_xstrdup(physical);
1128
1129         /* Run the mapping script. */
1130         pid = popen2(&in, &out, map->script, physical, NULL);
1131
1132         /* popen2() returns 0 on failure. */
1133         if (pid == 0)
1134                 return logical;
1135
1136         /* Write mappings to stdin of mapping script. */
1137         for (i = 0; i < map->n_mappings; i++) {
1138                 fprintf(in, "%s\n", map->mapping[i]);
1139         }
1140         fclose(in);
1141         waitpid(pid, &status, 0);
1142
1143         if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
1144                 /* If the mapping script exited successfully, try to
1145                  * grab a line of output and use that as the name of the
1146                  * logical interface. */
1147                 char *new_logical = (char *)xmalloc(MAX_INTERFACE_LENGTH);
1148
1149                 if (fgets(new_logical, MAX_INTERFACE_LENGTH, out)) {
1150                         /* If we are able to read a line of output from the script,
1151                          * remove any trailing whitespace and use this value
1152                          * as the name of the logical interface. */
1153                         char *pch = new_logical + bb_strlen(new_logical) - 1;
1154
1155                         while (pch >= new_logical && isspace(*pch))
1156                                 *(pch--) = '\0';
1157
1158                         free(logical);
1159                         logical = new_logical;
1160                 } else {
1161                         /* If we are UNABLE to read a line of output, discard are
1162                          * freshly allocated memory. */
1163                         free(new_logical);
1164                 }
1165         }
1166
1167         fclose(out);
1168
1169         return logical;
1170 }
1171 #endif /* CONFIG_FEATURE_IFUPDOWN_MAPPING */
1172
1173 static llist_t *find_iface_state(llist_t *state_list, const char *iface)
1174 {
1175         unsigned short iface_len = bb_strlen(iface);
1176         llist_t *search = state_list;
1177
1178         while (search) {
1179                 if ((strncmp(search->data, iface, iface_len) == 0) &&
1180                                 (search->data[iface_len] == '=')) {
1181                         return(search);
1182                 }
1183                 search = search->link;
1184         }
1185         return(NULL);
1186 }
1187
1188 extern int ifupdown_main(int argc, char **argv)
1189 {
1190         int (*cmds) (struct interface_defn_t *) = NULL;
1191         struct interfaces_file_t *defn;
1192         FILE *state_fp = NULL;
1193         llist_t *state_list = NULL;
1194         llist_t *target_list = NULL;
1195         const char *interfaces = "/etc/network/interfaces";
1196         const char *statefile = "/var/run/ifstate";
1197
1198 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1199         int run_mappings = 1;
1200 #endif
1201         int do_all = 0;
1202         int force = 0;
1203         int any_failures = 0;
1204         int i;
1205
1206         if (bb_applet_name[2] == 'u') {
1207                 /* ifup command */
1208                 cmds = iface_up;
1209         } else {
1210                 /* ifdown command */
1211                 cmds = iface_down;
1212         }
1213
1214 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1215         while ((i = getopt(argc, argv, "i:hvnamf")) != -1)
1216 #else
1217                 while ((i = getopt(argc, argv, "i:hvnaf")) != -1)
1218 #endif
1219                 {
1220                         switch (i) {
1221                                 case 'i':       /* interfaces */
1222                                         interfaces = optarg;
1223                                         break;
1224                                 case 'v':       /* verbose */
1225                                         verbose = 1;
1226                                         break;
1227                                 case 'a':       /* all */
1228                                         do_all = 1;
1229                                         break;
1230                                 case 'n':       /* no-act */
1231                                         no_act = 1;
1232                                         break;
1233 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1234                                 case 'm':       /* no-mappings */
1235                                         run_mappings = 0;
1236                                         break;
1237 #endif
1238                                 case 'f':       /* force */
1239                                         force = 1;
1240                                         break;
1241                                 default:
1242                                         bb_show_usage();
1243                                         break;
1244                         }
1245                 }
1246
1247         if (argc - optind > 0) {
1248                 if (do_all) {
1249                         bb_show_usage();
1250                 }
1251         } else {
1252                 if (!do_all) {
1253                         bb_show_usage();
1254                 }
1255         }
1256
1257         debug_noise("reading %s file:\n", interfaces);
1258         defn = read_interfaces(interfaces);
1259         debug_noise("\ndone reading %s\n\n", interfaces);
1260
1261         if (!defn) {
1262                 exit(EXIT_FAILURE);
1263         }
1264
1265         if (no_act) {
1266                 state_fp = fopen(statefile, "r");
1267         }
1268
1269         /* Create a list of interfaces to work on */
1270         if (do_all) {
1271                 if (cmds == iface_up) {
1272                         target_list = defn->autointerfaces;
1273                 } else {
1274 #if 0
1275                         /* iface_down */
1276                         llist_t *new_item;
1277                         const llist_t *list = state_list;
1278                         while (list) {
1279                                 new_item = xmalloc(sizeof(llist_t));
1280                                 new_item->data = strdup(list->data);
1281                                 new_item->link = NULL;
1282                                 list = target_list;
1283                                 if (list == NULL)
1284                                         target_list = new_item;
1285                                 else {
1286                                         while (list->link) {
1287                                                 list = list->link;
1288                                         }
1289                                         list = new_item;
1290                                 }
1291                                 list = list->link;
1292                         }
1293                         target_list = defn->autointerfaces;
1294 #else
1295
1296                         /* iface_down */
1297                         const llist_t *list = state_list;
1298                         while (list) {
1299                                 target_list = llist_add_to_end(target_list, strdup(list->data));
1300                                 list = list->link;
1301                         }
1302                         target_list = defn->autointerfaces;
1303 #endif
1304                 }
1305         } else {
1306                 target_list = llist_add_to_end(target_list, argv[optind]);
1307         }
1308
1309
1310         /* Update the interfaces */
1311         while (target_list) {
1312                 llist_t *iface_list;
1313                 struct interface_defn_t *currif;
1314                 char *iface;
1315                 char *liface;
1316                 char *pch;
1317                 int okay = 0;
1318                 int cmds_ret;
1319
1320                 iface = strdup(target_list->data);
1321                 target_list = target_list->link;
1322
1323                 pch = strchr(iface, '=');
1324                 if (pch) {
1325                         *pch = '\0';
1326                         liface = strdup(pch + 1);
1327                 } else {
1328                         liface = strdup(iface);
1329                 }
1330
1331                 if (!force) {
1332                         const llist_t *iface_state = find_iface_state(state_list, iface);
1333
1334                         if (cmds == iface_up) {
1335                                 /* ifup */
1336                                 if (iface_state) {
1337                                         bb_error_msg("interface %s already configured", iface);
1338                                         continue;
1339                                 }
1340                         } else {
1341                                 /* ifdown */
1342                                 if (iface_state) {
1343                                         bb_error_msg("interface %s not configured", iface);
1344                                         continue;
1345                                 }
1346                         }
1347                 }
1348
1349 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1350                 if ((cmds == iface_up) && run_mappings) {
1351                         struct mapping_defn_t *currmap;
1352
1353                         for (currmap = defn->mappings; currmap; currmap = currmap->next) {
1354
1355                                 for (i = 0; i < currmap->n_matches; i++) {
1356                                         if (fnmatch(currmap->match[i], liface, 0) != 0)
1357                                                 continue;
1358                                         if (verbose) {
1359                                                 printf("Running mapping script %s on %s\n", currmap->script, liface);
1360                                         }
1361                                         liface = run_mapping(iface, currmap);
1362                                         break;
1363                                 }
1364                         }
1365                 }
1366 #endif
1367
1368
1369                 iface_list = defn->ifaces;
1370                 while (iface_list) {
1371                         currif = (struct interface_defn_t *) iface_list->data;
1372                         if (strcmp(liface, currif->iface) == 0) {
1373                                 char *oldiface = currif->iface;
1374
1375                                 okay = 1;
1376                                 currif->iface = iface;
1377
1378                                 debug_noise("\nConfiguring interface %s (%s)\n", liface, currif->address_family->name);
1379
1380                                 /* Call the cmds function pointer, does either iface_up() or iface_down() */
1381                                 cmds_ret = cmds(currif);
1382                                 if (cmds_ret == -1) {
1383                                         bb_error_msg("Don't seem to have all the variables for %s/%s.",
1384                                                         liface, currif->address_family->name);
1385                                         any_failures += 1;
1386                                 } else if (cmds_ret == 0) {
1387                                         any_failures += 1;
1388                                 }
1389
1390                                 currif->iface = oldiface;
1391                         }
1392                         iface_list = iface_list->link;
1393                 }
1394                 if (verbose) {
1395                         printf("\n");
1396                 }
1397
1398                 if (!okay && !force) {
1399                         bb_error_msg("Ignoring unknown interface %s", liface);
1400                         any_failures += 1;
1401                 } else {
1402                         llist_t *iface_state = find_iface_state(state_list, iface);
1403
1404                         if (cmds == iface_up) {
1405                                 char *newiface = xmalloc(bb_strlen(iface) + 1 + bb_strlen(liface) + 1);
1406                                 sprintf(newiface, "%s=%s", iface, liface);
1407                                 if (iface_state == NULL) {
1408                                         state_list = llist_add_to_end(state_list, newiface);
1409                                 } else {
1410                                         free(iface_state->data);
1411                                         iface_state->data = newiface;
1412                                 }
1413                         } else if (cmds == iface_down) {
1414                                 /* Remove an interface from the linked list */
1415                                 if (iface_state) {
1416                                         /* This needs to be done better */
1417                                         free(iface_state->data);
1418                                         free(iface_state->link);
1419                                         if (iface_state->link) {
1420                                                 iface_state->data = iface_state->link->data;
1421                                                 iface_state->link = iface_state->link->link;
1422                                         } else {
1423                                                 iface_state->data = NULL;
1424                                                 iface_state->link = NULL;
1425                                         }
1426                                 }
1427                         }
1428                 }
1429         }
1430
1431         /* Actually write the new state */
1432         if (!no_act) {
1433
1434                 if (state_fp)
1435                         fclose(state_fp);
1436                 state_fp = bb_xfopen(statefile, "a+");
1437
1438                 if (ftruncate(fileno(state_fp), 0) < 0) {
1439                         bb_error_msg_and_die("failed to truncate statefile %s: %s", statefile, strerror(errno));
1440                 }
1441
1442                 rewind(state_fp);
1443
1444                 while (state_list) {
1445                         if (state_list->data) {
1446                                 fputs(state_list->data, state_fp);
1447                                 fputc('\n', state_fp);
1448                         }
1449                         state_list = state_list->link;
1450                 }
1451                 fflush(state_fp);
1452         }
1453
1454         /* Cleanup */
1455         if (state_fp != NULL) {
1456                 fclose(state_fp);
1457                 state_fp = NULL;
1458         }
1459
1460         if (any_failures)
1461                 return 1;
1462         return 0;
1463 }