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 bootp_down(struct interface_defn_t *ifd, execfn *exec)
 555 {
 556 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 557         return(execute("ip link set %iface% down", ifd, exec));
 558 #else
 559         return(execute("ifconfig %iface% down", ifd, exec));
 560 #endif
 561 }
 562
 563 static int dhcp_down(struct interface_defn_t *ifd, execfn *exec)
 564 {
 565         int result = 0;
 566         if (execable("/sbin/udhcpc")) {
 567                 execute("kill -USR2 `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec);
 568                 execute("kill -9 `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec);
 569         } else if (execable("/sbin/pump")) {
 570                 result = execute("pump -i %iface% -k", ifd, exec);
 571         } else if (execable("/sbin/dhclient")) {
 572                 result = execute("kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null", ifd, exec);
 573         } else if (execable("/sbin/dhcpcd")) {
 574                 result = execute("dhcpcd -k %iface%", ifd, exec);
 575         }
 576         static_down(ifd, exec);
 577         return (result || bootp_down(ifd, exec));
 578 }
 579
 580 static int bootp_up(struct interface_defn_t *ifd, execfn *exec)
 581 {
 582         return( execute("bootpc [[--bootfile %bootfile%]] --dev %iface% "
 583                                 "[[--server %server%]] [[--hwaddr %hwaddr%]] "
 584                                 "--returniffail --serverbcast", ifd, exec));
 585 }
 586
 587 static int ppp_up(struct interface_defn_t *ifd, execfn *exec)
 588 {
 589         return( execute("pon [[%provider%]]", ifd, exec));
 590 }
 591
 592 static int ppp_down(struct interface_defn_t *ifd, execfn *exec)
 593 {
 594         return( execute("poff [[%provider%]]", ifd, exec));
 595 }
 596
 597 static int wvdial_up(struct interface_defn_t *ifd, execfn *exec)
 598 {
 599         return( execute("/sbin/start-stop-daemon --start -x /usr/bin/wvdial "
 600                                 "-p /var/run/wvdial.%iface% -b -m -- [[ %provider% ]]", ifd, exec));
 601 }
 602
 603 static int wvdial_down(struct interface_defn_t *ifd, execfn *exec)
 604 {
 605         return( execute("/sbin/start-stop-daemon --stop -x /usr/bin/wvdial "
 606                                 "-p /var/run/wvdial.%iface% -s 2", ifd, exec));
 607 }
 608
 609 static struct method_t methods[] =
 610 {
 611         { "wvdial", wvdial_up, wvdial_down, },
 612         { "ppp", ppp_up, ppp_down, },
 613         { "static", static_up, static_down, },
 614         { "bootp", bootp_up, bootp_down, },
 615         { "dhcp", dhcp_up, dhcp_down, },
 616         { "loopback", loopback_up, loopback_down, },
 617 };
 618
 619 struct address_family_t addr_inet =
 620 {
 621         "inet",
 622         sizeof(methods) / sizeof(struct method_t),
 623         methods
 624 };
 625
 626 #endif  /* ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 */
 627
 628 static char *next_word(char **buf)
 629 {
 630         unsigned short length;
 631         char *word;
 632
 633         if ((buf == NULL) || (*buf == NULL) || (**buf == '\0')) {
 634                 return NULL;
 635         }
 636
 637         /* Skip over leading whitespace */
 638         word = *buf;
 639         while (isspace(*word)) {
 640                 ++word;
 641         }
 642
 643         /* Skip over comments */
 644         if (*word == '#') {
 645                 return(NULL);
 646         }
 647
 648         /* Find the length of this word */
 649         length = strcspn(word, " \t\n");
 650         if (length == 0) {
 651                 return(NULL);
 652         }
 653         *buf = word + length;
 654         /*DBU:[dave@cray.com] if we are already at EOL dont't increment beyond it */
 655         if (**buf) {
 656                 **buf = '\0';
 657                 (*buf)++;
 658         }
 659
 660         return word;
 661 }
 662
 663 static struct address_family_t *get_address_family(struct address_family_t *af[], char *name)
 664 {
 665         int i;
 666
 667         for (i = 0; af[i]; i++) {
 668                 if (strcmp(af[i]->name, name) == 0) {
 669                         return af[i];
 670                 }
 671         }
 672         return NULL;
 673 }
 674
 675 static struct method_t *get_method(struct address_family_t *af, char *name)
 676 {
 677         int i;
 678
 679         for (i = 0; i < af->n_methods; i++) {
 680                 if (strcmp(af->method[i].name, name) == 0) {
 681                         return &af->method[i];
 682                 }
 683         }
 684         return(NULL);
 685 }
 686
 687 static int duplicate_if(struct interface_defn_t *ifa, struct interface_defn_t *ifb)
 688 {
 689         if (strcmp(ifa->iface, ifb->iface) != 0) {
 690                 return(0);
 691         }
 692         if (ifa->address_family != ifb->address_family) {
 693                 return(0);
 694         }
 695         return(1);
 696 }
 697
 698 static const llist_t *find_list_string(const llist_t *list, const char *string)
 699 {
 700         while (list) {
 701                 if (strcmp(list->data, string) == 0) {
 702                         return(list);
 703                 }
 704                 list = list->link;
 705         }
 706         return(NULL);
 707 }
 708
 709 static struct interfaces_file_t *read_interfaces(char *filename)
 710 {
 711 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 712         struct mapping_defn_t *currmap = NULL;
 713 #endif
 714         struct interface_defn_t *currif = NULL;
 715         struct interfaces_file_t *defn;
 716         FILE *f;
 717         char *firstword;
 718         char *buf;
 719
 720         enum { NONE, IFACE, MAPPING } currently_processing = NONE;
 721
 722         defn = xmalloc(sizeof(struct interfaces_file_t));
 723         defn->autointerfaces = NULL;
 724         defn->mappings = NULL;
 725         defn->ifaces = NULL;
 726
 727         f = bb_xfopen(filename, "r");
 728
 729         while ((buf = bb_get_chomped_line_from_file(f)) != NULL) {
 730                 char *buf_ptr = buf;
 731
 732                 firstword = next_word(&buf_ptr);
 733                 if (firstword == NULL) {
 734                         free(buf);
 735                         continue;       /* blank line */
 736                 }
 737
 738                 if (strcmp(firstword, "mapping") == 0) {
 739 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 740                         currmap = xmalloc(sizeof(struct mapping_defn_t));
 741                         currmap->max_matches = 0;
 742                         currmap->n_matches = 0;
 743                         currmap->match = NULL;
 744
 745                         while ((firstword = next_word(&buf_ptr)) != NULL) {
 746                                 if (currmap->max_matches == currmap->n_matches) {
 747                                         currmap->max_matches = currmap->max_matches * 2 + 1;
 748                                         currmap->match = xrealloc(currmap->match, sizeof(currmap->match) * currmap->max_matches);
 749                                 }
 750
 751                                 currmap->match[currmap->n_matches++] = bb_xstrdup(firstword);
 752                         }
 753                         currmap->max_mappings = 0;
 754                         currmap->n_mappings = 0;
 755                         currmap->mapping = NULL;
 756                         currmap->script = NULL;
 757                         {
 758                                 struct mapping_defn_t **where = &defn->mappings;
 759                                 while (*where != NULL) {
 760                                         where = &(*where)->next;
 761                                 }
 762                                 *where = currmap;
 763                                 currmap->next = NULL;
 764                         }
 765                         debug_noise("Added mapping\n");
 766 #endif
 767                         currently_processing = MAPPING;
 768                 } else if (strcmp(firstword, "iface") == 0) {
 769                         {
 770                                 char *iface_name;
 771                                 char *address_family_name;
 772                                 char *method_name;
 773                                 struct address_family_t *addr_fams[] = {
 774 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
 775                                         &addr_inet,
 776 #endif
 777 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
 778                                         &addr_inet6,
 779 #endif
 780 #ifdef CONFIG_FEATURE_IFUPDOWN_IPX
 781                                         &addr_ipx,
 782 #endif
 783                                         NULL
 784                                 };
 785
 786                                 currif = xmalloc(sizeof(struct interface_defn_t));
 787                                 iface_name = next_word(&buf_ptr);
 788                                 address_family_name = next_word(&buf_ptr);
 789                                 method_name = next_word(&buf_ptr);
 790
 791                                 if (buf_ptr == NULL) {
 792                                         bb_error_msg("too few parameters for line \"%s\"", buf);
 793                                         return NULL;
 794                                 }
 795
 796                                 /* ship any trailing whitespace */
 797                                 while (isspace(*buf_ptr)) {
 798                                         ++buf_ptr;
 799                                 }
 800
 801                                 if (buf_ptr[0] != '\0') {
 802                                         bb_error_msg("too many parameters \"%s\"", buf);
 803                                         return NULL;
 804                                 }
 805
 806                                 currif->iface = bb_xstrdup(iface_name);
 807
 808                                 currif->address_family = get_address_family(addr_fams, address_family_name);
 809                                 if (!currif->address_family) {
 810                                         bb_error_msg("unknown address type \"%s\"", address_family_name);
 811                                         return NULL;
 812                                 }
 813
 814                                 currif->method = get_method(currif->address_family, method_name);
 815                                 if (!currif->method) {
 816                                         bb_error_msg("unknown method \"%s\"", method_name);
 817                                         return NULL;
 818                                 }
 819
 820                                 currif->automatic = 1;
 821                                 currif->max_options = 0;
 822                                 currif->n_options = 0;
 823                                 currif->option = NULL;
 824
 825                                 {
 826                                         struct interface_defn_t *tmp;
 827                                         llist_t *iface_list;
 828                                         iface_list = defn->ifaces;
 829                                         while (iface_list) {
 830                                                 tmp = (struct interface_defn_t *) iface_list->data;
 831                                                 if (duplicate_if(tmp, currif)) {
 832                                                         bb_error_msg("duplicate interface \"%s\"", tmp->iface);
 833                                                         return NULL;
 834                                                 }
 835                                                 iface_list = iface_list->link;
 836                                         }
 837
 838                                         defn->ifaces = llist_add_to_end(defn->ifaces, (char*)currif);
 839                                 }
 840                                 debug_noise("iface %s %s %s\n", currif->iface, address_family_name, method_name);
 841                         }
 842                         currently_processing = IFACE;
 843                 } else if (strcmp(firstword, "auto") == 0) {
 844                         while ((firstword = next_word(&buf_ptr)) != NULL) {
 845
 846                                 /* Check the interface isnt already listed */
 847                                 if (find_list_string(defn->autointerfaces, firstword)) {
 848                                         bb_perror_msg_and_die("interface declared auto twice \"%s\"", buf);
 849                                 }
 850
 851                                 /* Add the interface to the list */
 852                                 defn->autointerfaces = llist_add_to_end(defn->autointerfaces, strdup(firstword));
 853                                 debug_noise("\nauto %s\n", firstword);
 854                         }
 855                         currently_processing = NONE;
 856                 } else {
 857                         switch (currently_processing) {
 858                                 case IFACE:
 859                                         {
 860                                                 int i;
 861
 862                                                 if (bb_strlen(buf_ptr) == 0) {
 863                                                         bb_error_msg("option with empty value \"%s\"", buf);
 864                                                         return NULL;
 865                                                 }
 866
 867                                                 if (strcmp(firstword, "up") != 0
 868                                                                 && strcmp(firstword, "down") != 0
 869                                                                 && strcmp(firstword, "pre-up") != 0
 870                                                                 && strcmp(firstword, "post-down") != 0) {
 871                                                         for (i = 0; i < currif->n_options; i++) {
 872                                                                 if (strcmp(currif->option[i].name, firstword) == 0) {
 873                                                                         bb_error_msg("duplicate option \"%s\"", buf);
 874                                                                         return NULL;
 875                                                                 }
 876                                                         }
 877                                                 }
 878                                         }
 879                                         if (currif->n_options >= currif->max_options) {
 880                                                 struct variable_t *opt;
 881
 882                                                 currif->max_options = currif->max_options + 10;
 883                                                 opt = xrealloc(currif->option, sizeof(*opt) * currif->max_options);
 884                                                 currif->option = opt;
 885                                         }
 886                                         currif->option[currif->n_options].name = bb_xstrdup(firstword);
 887                                         currif->option[currif->n_options].value = bb_xstrdup(buf_ptr);
 888                                         if (!currif->option[currif->n_options].name) {
 889                                                 perror(filename);
 890                                                 return NULL;
 891                                         }
 892                                         if (!currif->option[currif->n_options].value) {
 893                                                 perror(filename);
 894                                                 return NULL;
 895                                         }
 896                                         debug_noise("\t%s=%s\n", currif->option[currif->n_options].name,
 897                                                         currif->option[currif->n_options].value);
 898                                         currif->n_options++;
 899                                         break;
 900                                 case MAPPING:
 901 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 902                                         if (strcmp(firstword, "script") == 0) {
 903                                                 if (currmap->script != NULL) {
 904                                                         bb_error_msg("duplicate script in mapping \"%s\"", buf);
 905                                                         return NULL;
 906                                                 } else {
 907                                                         currmap->script = bb_xstrdup(next_word(&buf_ptr));
 908                                                 }
 909                                         } else if (strcmp(firstword, "map") == 0) {
 910                                                 if (currmap->max_mappings == currmap->n_mappings) {
 911                                                         currmap->max_mappings = currmap->max_mappings * 2 + 1;
 912                                                         currmap->mapping = xrealloc(currmap->mapping, sizeof(char *) * currmap->max_mappings);
 913                                                 }
 914                                                 currmap->mapping[currmap->n_mappings] = bb_xstrdup(next_word(&buf_ptr));
 915                                                 currmap->n_mappings++;
 916                                         } else {
 917                                                 bb_error_msg("misplaced option \"%s\"", buf);
 918                                                 return NULL;
 919                                         }
 920 #endif
 921                                         break;
 922                                 case NONE:
 923                                 default:
 924                                         bb_error_msg("misplaced option \"%s\"", buf);
 925                                         return NULL;
 926                         }
 927                 }
 928                 free(buf);
 929         }
 930         if (ferror(f) != 0) {
 931                 bb_perror_msg_and_die("%s", filename);
 932         }
 933         fclose(f);
 934
 935         return defn;
 936 }
 937
 938 static char *setlocalenv(char *format, char *name, char *value)
 939 {
 940         char *result;
 941         char *here;
 942         char *there;
 943
 944         result = xmalloc(bb_strlen(format) + bb_strlen(name) + bb_strlen(value) + 1);
 945
 946         sprintf(result, format, name, value);
 947
 948         for (here = there = result; *there != '=' && *there; there++) {
 949                 if (*there == '-')
 950                         *there = '_';
 951                 if (isalpha(*there))
 952                         *there = toupper(*there);
 953
 954                 if (isalnum(*there) || *there == '_') {
 955                         *here = *there;
 956                         here++;
 957                 }
 958         }
 959         memmove(here, there, bb_strlen(there) + 1);
 960
 961         return result;
 962 }
 963
 964 static void set_environ(struct interface_defn_t *iface, char *mode)
 965 {
 966         char **environend;
 967         int i;
 968         const int n_env_entries = iface->n_options + 5;
 969         char **ppch;
 970
 971         if (environ != NULL) {
 972                 for (ppch = environ; *ppch; ppch++) {
 973                         free(*ppch);
 974                         *ppch = NULL;
 975                 }
 976                 free(environ);
 977                 environ = NULL;
 978         }
 979         environ = xmalloc(sizeof(char *) * (n_env_entries + 1 /* for final NULL */ ));
 980         environend = environ;
 981         *environend = NULL;
 982
 983         for (i = 0; i < iface->n_options; i++) {
 984                 if (strcmp(iface->option[i].name, "up") == 0
 985                                 || strcmp(iface->option[i].name, "down") == 0
 986                                 || strcmp(iface->option[i].name, "pre-up") == 0
 987                                 || strcmp(iface->option[i].name, "post-down") == 0) {
 988                         continue;
 989                 }
 990                 *(environend++) = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value);
 991                 *environend = NULL;
 992         }
 993
 994         *(environend++) = setlocalenv("%s=%s", "IFACE", iface->iface);
 995         *environend = NULL;
 996         *(environend++) = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name);
 997         *environend = NULL;
 998         *(environend++) = setlocalenv("%s=%s", "METHOD", iface->method->name);
 999         *environend = NULL;
1000         *(environend++) = setlocalenv("%s=%s", "MODE", mode);
1001         *environend = NULL;
1002         *(environend++) = setlocalenv("%s=%s", "PATH", "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin");
1003         *environend = NULL;
1004 }
1005
1006 static int doit(char *str)
1007 {
1008         if (verbose || no_act) {
1009                 printf("%s\n", str);
1010         }
1011         if (!no_act) {
1012                 pid_t child;
1013                 int status;
1014
1015                 fflush(NULL);
1016                 switch (child = fork()) {
1017                         case -1:                /* failure */
1018                                 return 0;
1019                         case 0:         /* child */
1020                                 execle(DEFAULT_SHELL, DEFAULT_SHELL, "-c", str, NULL, environ);
1021                                 exit(127);
1022                 }
1023                 waitpid(child, &status, 0);
1024                 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
1025                         return 0;
1026                 }
1027         }
1028         return (1);
1029 }
1030
1031 static int execute_all(struct interface_defn_t *ifd, execfn *exec, const char *opt)
1032 {
1033         int i;
1034         char *buf;
1035         for (i = 0; i < ifd->n_options; i++) {
1036                 if (strcmp(ifd->option[i].name, opt) == 0) {
1037                         if (!(*exec) (ifd->option[i].value)) {
1038                                 return 0;
1039                         }
1040                 }
1041         }
1042
1043         bb_xasprintf(&buf, "run-parts /etc/network/if-%s.d", opt);
1044         if ((*exec)(buf) != 1) {
1045                 return 0;
1046         }
1047         return 1;
1048 }
1049
1050 static int check(char *str) {
1051         return str != NULL;
1052 }
1053
1054 static int iface_up(struct interface_defn_t *iface)
1055 {
1056         if (!iface->method->up(iface,check)) return -1;
1057         set_environ(iface, "start");
1058         if (!execute_all(iface, doit, "pre-up")) return 0;
1059         if (!iface->method->up(iface, doit)) return 0;
1060         if (!execute_all(iface, doit, "up")) return 0;
1061         return 1;
1062 }
1063
1064 static int iface_down(struct interface_defn_t *iface)
1065 {
1066         if (!iface->method->down(iface,check)) return -1;
1067         set_environ(iface, "stop");
1068         if (!execute_all(iface, doit, "down")) return 0;
1069         if (!iface->method->down(iface, doit)) return 0;
1070         if (!execute_all(iface, doit, "post-down")) return 0;
1071         return 1;
1072 }
1073
1074 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1075 static int popen2(FILE **in, FILE **out, char *command, ...)
1076 {
1077         va_list ap;
1078         char *argv[11] = { command };
1079         int argc;
1080         int infd[2], outfd[2];
1081         pid_t pid;
1082
1083         argc = 1;
1084         va_start(ap, command);
1085         while ((argc < 10) && (argv[argc] = va_arg(ap, char *))) {
1086                 argc++;
1087         }
1088         argv[argc] = NULL;      /* make sure */
1089         va_end(ap);
1090
1091         if (pipe(infd) != 0) {
1092                 return 0;
1093         }
1094
1095         if (pipe(outfd) != 0) {
1096                 close(infd[0]);
1097                 close(infd[1]);
1098                 return 0;
1099         }
1100
1101         fflush(NULL);
1102         switch (pid = fork()) {
1103                 case -1:                        /* failure */
1104                         close(infd[0]);
1105                         close(infd[1]);
1106                         close(outfd[0]);
1107                         close(outfd[1]);
1108                         return 0;
1109                 case 0:                 /* child */
1110                         dup2(infd[0], 0);
1111                         dup2(outfd[1], 1);
1112                         close(infd[0]);
1113                         close(infd[1]);
1114                         close(outfd[0]);
1115                         close(outfd[1]);
1116                         execvp(command, argv);
1117                         exit(127);
1118                 default:                        /* parent */
1119                         *in = fdopen(infd[1], "w");
1120                         *out = fdopen(outfd[0], "r");
1121                         close(infd[0]);
1122                         close(outfd[1]);
1123                         return pid;
1124         }
1125         /* unreached */
1126 }
1127
1128 static char *run_mapping(char *physical, struct mapping_defn_t * map)
1129 {
1130         FILE *in, *out;
1131         int i, status;
1132         pid_t pid;
1133
1134         char *logical = bb_xstrdup(physical);
1135
1136         /* Run the mapping script. */
1137         pid = popen2(&in, &out, map->script, physical, NULL);
1138
1139         /* popen2() returns 0 on failure. */
1140         if (pid == 0)
1141                 return logical;
1142
1143         /* Write mappings to stdin of mapping script. */
1144         for (i = 0; i < map->n_mappings; i++) {
1145                 fprintf(in, "%s\n", map->mapping[i]);
1146         }
1147         fclose(in);
1148         waitpid(pid, &status, 0);
1149
1150         if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
1151                 /* If the mapping script exited successfully, try to
1152                  * grab a line of output and use that as the name of the
1153                  * logical interface. */
1154                 char *new_logical = (char *)xmalloc(MAX_INTERFACE_LENGTH);
1155
1156                 if (fgets(new_logical, MAX_INTERFACE_LENGTH, out)) {
1157                         /* If we are able to read a line of output from the script,
1158                          * remove any trailing whitespace and use this value
1159                          * as the name of the logical interface. */
1160                         char *pch = new_logical + bb_strlen(new_logical) - 1;
1161
1162                         while (pch >= new_logical && isspace(*pch))
1163                                 *(pch--) = '\0';
1164
1165                         free(logical);
1166                         logical = new_logical;
1167                 } else {
1168                         /* If we are UNABLE to read a line of output, discard are
1169                          * freshly allocated memory. */
1170                         free(new_logical);
1171                 }
1172         }
1173
1174         fclose(out);
1175
1176         return logical;
1177 }
1178 #endif /* CONFIG_FEATURE_IFUPDOWN_MAPPING */
1179
1180 static llist_t *find_iface_state(llist_t *state_list, const char *iface)
1181 {
1182         unsigned short iface_len = bb_strlen(iface);
1183         llist_t *search = state_list;
1184
1185         while (search) {
1186                 if ((strncmp(search->data, iface, iface_len) == 0) &&
1187                                 (search->data[iface_len] == '=')) {
1188                         return(search);
1189                 }
1190                 search = search->link;
1191         }
1192         return(NULL);
1193 }
1194
1195 extern int ifupdown_main(int argc, char **argv)
1196 {
1197         int (*cmds) (struct interface_defn_t *) = NULL;
1198         struct interfaces_file_t *defn;
1199         FILE *state_fp = NULL;
1200         llist_t *state_list = NULL;
1201         llist_t *target_list = NULL;
1202         char *interfaces = "/etc/network/interfaces";
1203         const char *statefile = "/var/run/ifstate";
1204
1205 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1206         int run_mappings = 1;
1207 #endif
1208         int do_all = 0;
1209         int force = 0;
1210         int any_failures = 0;
1211         int i;
1212
1213         if (bb_applet_name[2] == 'u') {
1214                 /* ifup command */
1215                 cmds = iface_up;
1216         } else {
1217                 /* ifdown command */
1218                 cmds = iface_down;
1219         }
1220
1221 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1222         while ((i = getopt(argc, argv, "i:hvnamf")) != -1)
1223 #else
1224                 while ((i = getopt(argc, argv, "i:hvnaf")) != -1)
1225 #endif
1226                 {
1227                         switch (i) {
1228                                 case 'i':       /* interfaces */
1229                                         interfaces = bb_xstrdup(optarg);
1230                                         break;
1231                                 case 'v':       /* verbose */
1232                                         verbose = 1;
1233                                         break;
1234                                 case 'a':       /* all */
1235                                         do_all = 1;
1236                                         break;
1237                                 case 'n':       /* no-act */
1238                                         no_act = 1;
1239                                         break;
1240 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1241                                 case 'm':       /* no-mappings */
1242                                         run_mappings = 0;
1243                                         break;
1244 #endif
1245                                 case 'f':       /* force */
1246                                         force = 1;
1247                                         break;
1248                                 default:
1249                                         bb_show_usage();
1250                                         break;
1251                         }
1252                 }
1253
1254         if (argc - optind > 0) {
1255                 if (do_all) {
1256                         bb_show_usage();
1257                 }
1258         } else {
1259                 if (!do_all) {
1260                         bb_show_usage();
1261                 }
1262         }
1263
1264         debug_noise("reading %s file:\n", interfaces);
1265         defn = read_interfaces(interfaces);
1266         debug_noise("\ndone reading %s\n\n", interfaces);
1267
1268         if (!defn) {
1269                 exit(EXIT_FAILURE);
1270         }
1271
1272         if (no_act) {
1273                 state_fp = fopen(statefile, "r");
1274         }
1275
1276         /* Create a list of interfaces to work on */
1277         if (do_all) {
1278                 if (cmds == iface_up) {
1279                         target_list = defn->autointerfaces;
1280                 } else {
1281 #if 0
1282                         /* iface_down */
1283                         llist_t *new_item;
1284                         const llist_t *list = state_list;
1285                         while (list) {
1286                                 new_item = xmalloc(sizeof(llist_t));
1287                                 new_item->data = strdup(list->data);
1288                                 new_item->link = NULL;
1289                                 list = target_list;
1290                                 if (list == NULL)
1291                                         target_list = new_item;
1292                                 else {
1293                                         while (list->link) {
1294                                                 list = list->link;
1295                                         }
1296                                         list = new_item;
1297                                 }
1298                                 list = list->link;
1299                         }
1300                         target_list = defn->autointerfaces;
1301 #else
1302
1303                         /* iface_down */
1304                         const llist_t *list = state_list;
1305                         while (list) {
1306                                 target_list = llist_add_to_end(target_list, strdup(list->data));
1307                                 list = list->link;
1308                         }
1309                         target_list = defn->autointerfaces;
1310 #endif
1311                 }
1312         } else {
1313                 target_list = llist_add_to_end(target_list, argv[optind]);
1314         }
1315
1316
1317         /* Update the interfaces */
1318         while (target_list) {
1319                 llist_t *iface_list;
1320                 struct interface_defn_t *currif;
1321                 char *iface;
1322                 char *liface;
1323                 char *pch;
1324                 int okay = 0;
1325                 int cmds_ret;
1326
1327                 iface = strdup(target_list->data);
1328                 target_list = target_list->link;
1329
1330                 pch = strchr(iface, '=');
1331                 if (pch) {
1332                         *pch = '\0';
1333                         liface = strdup(pch + 1);
1334                 } else {
1335                         liface = strdup(iface);
1336                 }
1337
1338                 if (!force) {
1339                         const llist_t *iface_state = find_iface_state(state_list, iface);
1340
1341                         if (cmds == iface_up) {
1342                                 /* ifup */
1343                                 if (iface_state) {
1344                                         bb_error_msg("interface %s already configured", iface);
1345                                         continue;
1346                                 }
1347                         } else {
1348                                 /* ifdown */
1349                                 if (iface_state) {
1350                                         bb_error_msg("interface %s not configured", iface);
1351                                         continue;
1352                                 }
1353                         }
1354                 }
1355
1356 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1357                 if ((cmds == iface_up) && run_mappings) {
1358                         struct mapping_defn_t *currmap;
1359
1360                         for (currmap = defn->mappings; currmap; currmap = currmap->next) {
1361
1362                                 for (i = 0; i < currmap->n_matches; i++) {
1363                                         if (fnmatch(currmap->match[i], liface, 0) != 0)
1364                                                 continue;
1365                                         if (verbose) {
1366                                                 printf("Running mapping script %s on %s\n", currmap->script, liface);
1367                                         }
1368                                         liface = run_mapping(iface, currmap);
1369                                         break;
1370                                 }
1371                         }
1372                 }
1373 #endif
1374
1375
1376                 iface_list = defn->ifaces;
1377                 while (iface_list) {
1378                         currif = (struct interface_defn_t *) iface_list->data;
1379                         if (strcmp(liface, currif->iface) == 0) {
1380                                 char *oldiface = currif->iface;
1381
1382                                 okay = 1;
1383                                 currif->iface = iface;
1384
1385                                 debug_noise("\nConfiguring interface %s (%s)\n", liface, currif->address_family->name);
1386
1387                                 /* Call the cmds function pointer, does either iface_up() or iface_down() */
1388                                 cmds_ret = cmds(currif);
1389                                 if (cmds_ret == -1) {
1390                                         bb_error_msg("Don't seem to have all the variables for %s/%s.",
1391                                                         liface, currif->address_family->name);
1392                                         any_failures += 1;
1393                                 } else if (cmds_ret == 0) {
1394                                         any_failures += 1;
1395                                 }
1396
1397                                 currif->iface = oldiface;
1398                         }
1399                         iface_list = iface_list->link;
1400                 }
1401                 if (verbose) {
1402                         printf("\n");
1403                 }
1404
1405                 if (!okay && !force) {
1406                         bb_error_msg("Ignoring unknown interface %s", liface);
1407                         any_failures += 1;
1408                 } else {
1409                         llist_t *iface_state = find_iface_state(state_list, iface);
1410
1411                         if (cmds == iface_up) {
1412                                 char *newiface = xmalloc(bb_strlen(iface) + 1 + bb_strlen(liface) + 1);
1413                                 sprintf(newiface, "%s=%s", iface, liface);
1414                                 if (iface_state == NULL) {
1415                                         state_list = llist_add_to_end(state_list, newiface);
1416                                 } else {
1417                                         free(iface_state->data);
1418                                         iface_state->data = newiface;
1419                                 }
1420                         } else if (cmds == iface_down) {
1421                                 /* Remove an interface from the linked list */
1422                                 if (iface_state) {
1423                                         /* This needs to be done better */
1424                                         free(iface_state->data);
1425                                         free(iface_state->link);
1426                                         if (iface_state->link) {
1427                                                 iface_state->data = iface_state->link->data;
1428                                                 iface_state->link = iface_state->link->link;
1429                                         } else {
1430                                                 iface_state->data = NULL;
1431                                                 iface_state->link = NULL;
1432                                         }
1433                                 }
1434                         }
1435                 }
1436         }
1437
1438         /* Actually write the new state */
1439         if (!no_act) {
1440
1441                 if (state_fp)
1442                         fclose(state_fp);
1443                 state_fp = bb_xfopen(statefile, "a+");
1444
1445                 if (ftruncate(fileno(state_fp), 0) < 0) {
1446                         bb_error_msg_and_die("failed to truncate statefile %s: %s", statefile, strerror(errno));
1447                 }
1448
1449                 rewind(state_fp);
1450
1451                 while (state_list) {
1452                         if (state_list->data) {
1453                                 fputs(state_list->data, state_fp);
1454                                 fputc('\n', state_fp);
1455                         }
1456                         state_list = state_list->link;
1457                 }
1458                 fflush(state_fp);
1459         }
1460
1461         /* Cleanup */
1462         if (state_fp != NULL) {
1463                 fclose(state_fp);
1464                 state_fp = NULL;
1465         }
1466
1467         if (any_failures)
1468                 return 1;
1469         return 0;
1470 }