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 #ifndef __USE_GNU
 154 static char **environ = NULL;
 155 #endif
 156
 157 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 158
 159 static unsigned int count_bits(unsigned int a)
 160 {
 161         unsigned int result;
 162         result = (a & 0x55) + ((a >> 1) & 0x55);
 163         result = (result & 0x33) + ((result >> 2) & 0x33);
 164         return((result & 0x0F) + ((result >> 4) & 0x0F));
 165 }
 166
 167 static int count_netmask_bits(char *dotted_quad)
 168 {
 169         unsigned int result, a, b, c, d;
 170         /* Found a netmask...  Check if it is dotted quad */
 171         if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) != 4)
 172                 return -1;
 173         result = count_bits(a);
 174         result += count_bits(b);
 175         result += count_bits(c);
 176         result += count_bits(d);
 177         return ((int)result);
 178 }
 179 #endif
 180
 181 static void addstr(char **buf, size_t *len, size_t *pos, char *str, size_t str_length)
 182 {
 183         if (*pos + str_length >= *len) {
 184                 char *newbuf;
 185
 186                 newbuf = xrealloc(*buf, *len * 2 + str_length + 1);
 187                 *buf = newbuf;
 188                 *len = *len * 2 + str_length + 1;
 189         }
 190
 191         while (str_length-- >= 1) {
 192                 (*buf)[(*pos)++] = *str;
 193                 str++;
 194         }
 195         (*buf)[*pos] = '\0';
 196 }
 197
 198 static int strncmpz(char *l, char *r, size_t llen)
 199 {
 200         int i = strncmp(l, r, llen);
 201
 202         if (i == 0) {
 203                 return(-r[llen]);
 204         } else {
 205                 return(i);
 206         }
 207 }
 208
 209 static char *get_var(char *id, size_t idlen, struct interface_defn_t *ifd)
 210 {
 211         int i;
 212
 213         if (strncmpz(id, "iface", idlen) == 0) {
 214                 char *result;
 215                 static char label_buf[20];
 216                 strncpy(label_buf, ifd->iface, 19);
 217                 label_buf[19]=0;
 218                 result = strchr(label_buf, ':');
 219                 if (result) {
 220                         *result=0;
 221                 }
 222                 return( label_buf);
 223         } else if (strncmpz(id, "label", idlen) == 0) {
 224                 return (ifd->iface);
 225         } else {
 226                 for (i = 0; i < ifd->n_options; i++) {
 227                         if (strncmpz(id, ifd->option[i].name, idlen) == 0) {
 228                                 return (ifd->option[i].value);
 229                         }
 230                 }
 231         }
 232
 233         return(NULL);
 234 }
 235
 236 static char *parse(char *command, struct interface_defn_t *ifd)
 237 {
 238
 239         char *result = NULL;
 240         size_t pos = 0, len = 0;
 241         size_t old_pos[MAX_OPT_DEPTH] = { 0 };
 242         int okay[MAX_OPT_DEPTH] = { 1 };
 243         int opt_depth = 1;
 244
 245         while (*command) {
 246                 switch (*command) {
 247
 248                         default:
 249                                 addstr(&result, &len, &pos, command, 1);
 250                                 command++;
 251                                 break;
 252                         case '\\':
 253                                 if (command[1]) {
 254                                         addstr(&result, &len, &pos, command + 1, 1);
 255                                         command += 2;
 256                                 } else {
 257                                         addstr(&result, &len, &pos, command, 1);
 258                                         command++;
 259                                 }
 260                                 break;
 261                         case '[':
 262                                 if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) {
 263                                         old_pos[opt_depth] = pos;
 264                                         okay[opt_depth] = 1;
 265                                         opt_depth++;
 266                                         command += 2;
 267                                 } else {
 268                                         addstr(&result, &len, &pos, "[", 1);
 269                                         command++;
 270                                 }
 271                                 break;
 272                         case ']':
 273                                 if (command[1] == ']' && opt_depth > 1) {
 274                                         opt_depth--;
 275                                         if (!okay[opt_depth]) {
 276                                                 pos = old_pos[opt_depth];
 277                                                 result[pos] = '\0';
 278                                         }
 279                                         command += 2;
 280                                 } else {
 281                                         addstr(&result, &len, &pos, "]", 1);
 282                                         command++;
 283                                 }
 284                                 break;
 285                         case '%':
 286                                 {
 287                                         char *nextpercent;
 288                                         char *varvalue;
 289
 290                                         command++;
 291                                         nextpercent = strchr(command, '%');
 292                                         if (!nextpercent) {
 293                                                 errno = EUNBALPER;
 294                                                 free(result);
 295                                                 return (NULL);
 296                                         }
 297
 298                                         varvalue = get_var(command, nextpercent - command, ifd);
 299
 300                                         if (varvalue) {
 301                                                 addstr(&result, &len, &pos, varvalue, bb_strlen(varvalue));
 302                                         } else {
 303 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 304                                                 /* Sigh...  Add a special case for 'ip' to convert from
 305                                                  * dotted quad to bit count style netmasks.  */
 306                                                 if (strncmp(command, "bnmask", 6)==0) {
 307                                                         int res;
 308                                                         varvalue = get_var("netmask", 7, ifd);
 309                                                         if (varvalue && (res=count_netmask_bits(varvalue)) > 0) {
 310                                                                 char argument[255];
 311                                                                 sprintf(argument, "%d", res);
 312                                                                 addstr(&result, &len, &pos, argument, bb_strlen(argument));
 313                                                                 command = nextpercent + 1;
 314                                                                 break;
 315                                                         }
 316                                                 }
 317 #endif
 318                                                 okay[opt_depth - 1] = 0;
 319                                         }
 320
 321                                         command = nextpercent + 1;
 322                                 }
 323                                 break;
 324                 }
 325         }
 326
 327         if (opt_depth > 1) {
 328                 errno = EUNBALBRACK;
 329                 free(result);
 330                 return(NULL);
 331         }
 332
 333         if (!okay[0]) {
 334                 errno = EUNDEFVAR;
 335                 free(result);
 336                 return(NULL);
 337         }
 338
 339         return(result);
 340 }
 341
 342 static int execute(char *command, struct interface_defn_t *ifd, execfn *exec)
 343 {
 344         char *out;
 345         int ret;
 346
 347         out = parse(command, ifd);
 348         if (!out) {
 349                 return(0);
 350         }
 351         ret = (*exec) (out);
 352
 353         free(out);
 354         if (ret != 1) {
 355                 return(0);
 356         }
 357         return(1);
 358 }
 359
 360 #ifdef CONFIG_FEATURE_IFUPDOWN_IPX
 361 static int static_up_ipx(struct interface_defn_t *ifd, execfn *exec)
 362 {
 363         return(execute("ipx_interface add %iface% %frame% %netnum%", ifd, exec));
 364 }
 365
 366 static int static_down_ipx(struct interface_defn_t *ifd, execfn *exec)
 367 {
 368         return(execute("ipx_interface del %iface% %frame%", ifd, exec));
 369 }
 370
 371 static int dynamic_up(struct interface_defn_t *ifd, execfn *exec)
 372 {
 373         return(execute("ipx_interface add %iface% %frame%", ifd, exec));
 374 }
 375
 376 static int dynamic_down(struct interface_defn_t *ifd, execfn *exec)
 377 {
 378         return(execute("ipx_interface del %iface% %frame%", ifd, exec));
 379 }
 380
 381 static struct method_t methods_ipx[] = {
 382         { "dynamic", dynamic_up, dynamic_down, },
 383         { "static", static_up_ipx, static_down_ipx, },
 384 };
 385
 386 struct address_family_t addr_ipx = {
 387         "ipx",
 388         sizeof(methods_ipx) / sizeof(struct method_t),
 389         methods_ipx
 390 };
 391 #endif /* IFUP_FEATURE_IPX */
 392
 393 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
 394 static int loopback_up6(struct interface_defn_t *ifd, execfn *exec)
 395 {
 396 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 397         int result;
 398         result =execute("ip addr add ::1 dev %iface%", ifd, exec);
 399         result += execute("ip link set %iface% up", ifd, exec);
 400         return ((result == 2) ? 2 : 0);
 401 #else
 402         return( execute("ifconfig %iface% add ::1", ifd, exec));
 403 #endif
 404 }
 405
 406 static int loopback_down6(struct interface_defn_t *ifd, execfn *exec)
 407 {
 408 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 409         return(execute("ip link set %iface% down", ifd, exec));
 410 #else
 411         return(execute("ifconfig %iface% del ::1", ifd, exec));
 412 #endif
 413 }
 414
 415 static int static_up6(struct interface_defn_t *ifd, execfn *exec)
 416 {
 417         int result;
 418 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 419         result = execute("ip addr add %address%/%netmask% dev %iface% [[label %label%]]", ifd, exec);
 420         result += execute("ip link set [[mtu %mtu%]] [[address %hwaddress%]] %iface% up", ifd, exec);
 421         result += execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec);
 422 #else
 423         result = execute("ifconfig %iface% [[media %media%]] [[hw %hwaddress%]] [[mtu %mtu%]] up", ifd, exec);
 424         result += execute("ifconfig %iface% add %address%/%netmask%", ifd, exec);
 425         result += execute("[[ route -A inet6 add ::/0 gw %gateway% ]]", ifd, exec);
 426 #endif
 427         return ((result == 3) ? 3 : 0);
 428 }
 429
 430 static int static_down6(struct interface_defn_t *ifd, execfn *exec)
 431 {
 432 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 433         return(execute("ip link set %iface% down", ifd, exec));
 434 #else
 435         return(execute("ifconfig %iface% down", ifd, exec));
 436 #endif
 437 }
 438
 439 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 440 static int v4tunnel_up(struct interface_defn_t *ifd, execfn *exec)
 441 {
 442         int result;
 443         result = execute("ip tunnel add %iface% mode sit remote "
 444                                 "%endpoint% [[local %local%]] [[ttl %ttl%]]", ifd, exec);
 445         result += execute("ip link set %iface% up", ifd, exec);
 446         result += execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec);
 447         result += execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec);
 448         return ((result == 4) ? 4 : 0);
 449 }
 450
 451 static int v4tunnel_down(struct interface_defn_t * ifd, execfn * exec)
 452 {
 453         return( execute("ip tunnel del %iface%", ifd, exec));
 454 }
 455 #endif
 456
 457 static struct method_t methods6[] = {
 458 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 459         { "v4tunnel", v4tunnel_up, v4tunnel_down, },
 460 #endif
 461         { "static", static_up6, static_down6, },
 462         { "loopback", loopback_up6, loopback_down6, },
 463 };
 464
 465 static struct address_family_t addr_inet6 = {
 466         "inet6",
 467         sizeof(methods6) / sizeof(struct method_t),
 468         methods6
 469 };
 470 #endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */
 471
 472 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
 473 static int loopback_up(struct interface_defn_t *ifd, execfn *exec)
 474 {
 475 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 476         int result;
 477         result = execute("ip addr add 127.0.0.1/8 dev %iface%", ifd, exec);
 478         result += execute("ip link set %iface% up", ifd, exec);
 479         return ((result == 2) ? 2 : 0);
 480 #else
 481         return( execute("ifconfig %iface% 127.0.0.1 up", ifd, exec));
 482 #endif
 483 }
 484
 485 static int loopback_down(struct interface_defn_t *ifd, execfn *exec)
 486 {
 487 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 488         int result;
 489         result = execute("ip addr flush dev %iface%", ifd, exec);
 490         result += execute("ip link set %iface% down", ifd, exec);
 491         return ((result == 2) ? 2 : 0);
 492 #else
 493         return( execute("ifconfig %iface% 127.0.0.1 down", ifd, exec));
 494 #endif
 495 }
 496
 497 static int static_up(struct interface_defn_t *ifd, execfn *exec)
 498 {
 499         int result;
 500 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 501         result = execute("ip addr add %address%/%bnmask% [[broadcast %broadcast%]] "
 502                         "dev %iface% [[peer %pointopoint%]] [[label %label%]]", ifd, exec);
 503         result += execute("ip link set [[mtu %mtu%]] [[address %hwaddress%]] %iface% up", ifd, exec);
 504         result += execute("[[ ip route add default via %gateway% dev %iface% ]]", ifd, exec);
 505         return ((result == 3) ? 3 : 0);
 506 #else
 507         result = execute("ifconfig %iface% %address% netmask %netmask% "
 508                                 "[[broadcast %broadcast%]]      [[pointopoint %pointopoint%]] "
 509                                 "[[media %media%]] [[mtu %mtu%]]        [[hw %hwaddress%]] up",
 510                                 ifd, exec);
 511         result += execute("[[ route add default gw %gateway% %iface% ]]", ifd, exec);
 512         return ((result == 2) ? 2 : 0);
 513 #endif
 514 }
 515
 516 static int static_down(struct interface_defn_t *ifd, execfn *exec)
 517 {
 518         int result;
 519 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 520         result = execute("ip addr flush dev %iface%", ifd, exec);
 521         result += execute("ip link set %iface% down", ifd, exec);
 522 #else
 523         result = execute("[[ route del default gw %gateway% %iface% ]]", ifd, exec);
 524         result += execute("ifconfig %iface% down", ifd, exec);
 525 #endif
 526         return ((result == 2) ? 2 : 0);
 527 }
 528
 529 static int execable(char *program)
 530 {
 531         struct stat buf;
 532         if (0 == stat(program, &buf)) {
 533                 if (S_ISREG(buf.st_mode) && (S_IXUSR & buf.st_mode)) {
 534                         return(1);
 535                 }
 536         }
 537         return(0);
 538 }
 539
 540 static int dhcp_up(struct interface_defn_t *ifd, execfn *exec)
 541 {
 542         if (execable("/sbin/udhcpc")) {
 543                 return( execute("udhcpc -n -p /var/run/udhcpc.%iface%.pid -i "
 544                                         "%iface% [[-H %hostname%]] [[-c %clientid%]]", ifd, exec));
 545         } else if (execable("/sbin/pump")) {
 546                 return( execute("pump -i %iface% [[-h %hostname%]] [[-l %leasehours%]]", ifd, exec));
 547         } else if (execable("/sbin/dhclient")) {
 548                 return( execute("dhclient -pf /var/run/dhclient.%iface%.pid %iface%", ifd, exec));
 549         } else if (execable("/sbin/dhcpcd")) {
 550                 return( execute("dhcpcd [[-h %hostname%]] [[-i %vendor%]] [[-I %clientid%]] "
 551                                         "[[-l %leasetime%]] %iface%", ifd, exec));
 552         }
 553         return(0);
 554 }
 555
 556 static int dhcp_down(struct interface_defn_t *ifd, execfn *exec)
 557 {
 558         int result = 0;
 559         if (execable("/sbin/udhcpc")) {
 560                 /* SIGUSR2 forces udhcpc to release the current lease and go inactive,
 561                  * and SIGTERM causes udhcpc to exit.  Signals are queued and processed
 562                  * sequentially so we don't need to sleep */
 563                 result = execute("kill -USR2 `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec);
 564                 result += execute("kill -TERM `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec);
 565         } else if (execable("/sbin/pump")) {
 566                 result = execute("pump -i %iface% -k", ifd, exec);
 567         } else if (execable("/sbin/dhclient")) {
 568                 result = execute("kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null", ifd, exec);
 569         } else if (execable("/sbin/dhcpcd")) {
 570                 result = execute("dhcpcd -k %iface%", ifd, exec);
 571         }
 572         return (result || static_down(ifd, exec));
 573 }
 574
 575 static int bootp_up(struct interface_defn_t *ifd, execfn *exec)
 576 {
 577         return( execute("bootpc [[--bootfile %bootfile%]] --dev %iface% "
 578                                 "[[--server %server%]] [[--hwaddr %hwaddr%]] "
 579                                 "--returniffail --serverbcast", ifd, exec));
 580 }
 581
 582 static int ppp_up(struct interface_defn_t *ifd, execfn *exec)
 583 {
 584         return( execute("pon [[%provider%]]", ifd, exec));
 585 }
 586
 587 static int ppp_down(struct interface_defn_t *ifd, execfn *exec)
 588 {
 589         return( execute("poff [[%provider%]]", ifd, exec));
 590 }
 591
 592 static int wvdial_up(struct interface_defn_t *ifd, execfn *exec)
 593 {
 594         return( execute("/sbin/start-stop-daemon --start -x /usr/bin/wvdial "
 595                                 "-p /var/run/wvdial.%iface% -b -m -- [[ %provider% ]]", ifd, exec));
 596 }
 597
 598 static int wvdial_down(struct interface_defn_t *ifd, execfn *exec)
 599 {
 600         return( execute("/sbin/start-stop-daemon --stop -x /usr/bin/wvdial "
 601                                 "-p /var/run/wvdial.%iface% -s 2", ifd, exec));
 602 }
 603
 604 static struct method_t methods[] =
 605 {
 606         { "wvdial", wvdial_up, wvdial_down, },
 607         { "ppp", ppp_up, ppp_down, },
 608         { "static", static_up, static_down, },
 609         { "bootp", bootp_up, static_down, },
 610         { "dhcp", dhcp_up, dhcp_down, },
 611         { "loopback", loopback_up, loopback_down, },
 612 };
 613
 614 static struct address_family_t addr_inet =
 615 {
 616         "inet",
 617         sizeof(methods) / sizeof(struct method_t),
 618         methods
 619 };
 620
 621 #endif  /* ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 */
 622
 623 static char *next_word(char **buf)
 624 {
 625         unsigned short length;
 626         char *word;
 627
 628         if ((buf == NULL) || (*buf == NULL) || (**buf == '\0')) {
 629                 return NULL;
 630         }
 631
 632         /* Skip over leading whitespace */
 633         word = *buf;
 634         while (isspace(*word)) {
 635                 ++word;
 636         }
 637
 638         /* Skip over comments */
 639         if (*word == '#') {
 640                 return(NULL);
 641         }
 642
 643         /* Find the length of this word */
 644         length = strcspn(word, " \t\n");
 645         if (length == 0) {
 646                 return(NULL);
 647         }
 648         *buf = word + length;
 649         /*DBU:[dave@cray.com] if we are already at EOL dont't increment beyond it */
 650         if (**buf) {
 651                 **buf = '\0';
 652                 (*buf)++;
 653         }
 654
 655         return word;
 656 }
 657
 658 static struct address_family_t *get_address_family(struct address_family_t *af[], char *name)
 659 {
 660         int i;
 661
 662         for (i = 0; af[i]; i++) {
 663                 if (strcmp(af[i]->name, name) == 0) {
 664                         return af[i];
 665                 }
 666         }
 667         return NULL;
 668 }
 669
 670 static struct method_t *get_method(struct address_family_t *af, char *name)
 671 {
 672         int i;
 673
 674         for (i = 0; i < af->n_methods; i++) {
 675                 if (strcmp(af->method[i].name, name) == 0) {
 676                         return &af->method[i];
 677                 }
 678         }
 679         return(NULL);
 680 }
 681
 682 static int duplicate_if(struct interface_defn_t *ifa, struct interface_defn_t *ifb)
 683 {
 684         if (strcmp(ifa->iface, ifb->iface) != 0) {
 685                 return(0);
 686         }
 687         if (ifa->address_family != ifb->address_family) {
 688                 return(0);
 689         }
 690         return(1);
 691 }
 692
 693 static const llist_t *find_list_string(const llist_t *list, const char *string)
 694 {
 695         while (list) {
 696                 if (strcmp(list->data, string) == 0) {
 697                         return(list);
 698                 }
 699                 list = list->link;
 700         }
 701         return(NULL);
 702 }
 703
 704 static struct interfaces_file_t *read_interfaces(const char *filename)
 705 {
 706 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 707         struct mapping_defn_t *currmap = NULL;
 708 #endif
 709         struct interface_defn_t *currif = NULL;
 710         struct interfaces_file_t *defn;
 711         FILE *f;
 712         char *firstword;
 713         char *buf;
 714
 715         enum { NONE, IFACE, MAPPING } currently_processing = NONE;
 716
 717         defn = xmalloc(sizeof(struct interfaces_file_t));
 718         defn->autointerfaces = NULL;
 719         defn->mappings = NULL;
 720         defn->ifaces = NULL;
 721
 722         f = bb_xfopen(filename, "r");
 723
 724         while ((buf = bb_get_chomped_line_from_file(f)) != NULL) {
 725                 char *buf_ptr = buf;
 726
 727                 firstword = next_word(&buf_ptr);
 728                 if (firstword == NULL) {
 729                         free(buf);
 730                         continue;       /* blank line */
 731                 }
 732
 733                 if (strcmp(firstword, "mapping") == 0) {
 734 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 735                         currmap = xmalloc(sizeof(struct mapping_defn_t));
 736                         currmap->max_matches = 0;
 737                         currmap->n_matches = 0;
 738                         currmap->match = NULL;
 739
 740                         while ((firstword = next_word(&buf_ptr)) != NULL) {
 741                                 if (currmap->max_matches == currmap->n_matches) {
 742                                         currmap->max_matches = currmap->max_matches * 2 + 1;
 743                                         currmap->match = xrealloc(currmap->match, sizeof(currmap->match) * currmap->max_matches);
 744                                 }
 745
 746                                 currmap->match[currmap->n_matches++] = bb_xstrdup(firstword);
 747                         }
 748                         currmap->max_mappings = 0;
 749                         currmap->n_mappings = 0;
 750                         currmap->mapping = NULL;
 751                         currmap->script = NULL;
 752                         {
 753                                 struct mapping_defn_t **where = &defn->mappings;
 754                                 while (*where != NULL) {
 755                                         where = &(*where)->next;
 756                                 }
 757                                 *where = currmap;
 758                                 currmap->next = NULL;
 759                         }
 760                         debug_noise("Added mapping\n");
 761 #endif
 762                         currently_processing = MAPPING;
 763                 } else if (strcmp(firstword, "iface") == 0) {
 764                         {
 765                                 char *iface_name;
 766                                 char *address_family_name;
 767                                 char *method_name;
 768                                 struct address_family_t *addr_fams[] = {
 769 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
 770                                         &addr_inet,
 771 #endif
 772 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
 773                                         &addr_inet6,
 774 #endif
 775 #ifdef CONFIG_FEATURE_IFUPDOWN_IPX
 776                                         &addr_ipx,
 777 #endif
 778                                         NULL
 779                                 };
 780
 781                                 currif = xmalloc(sizeof(struct interface_defn_t));
 782                                 iface_name = next_word(&buf_ptr);
 783                                 address_family_name = next_word(&buf_ptr);
 784                                 method_name = next_word(&buf_ptr);
 785
 786                                 if (buf_ptr == NULL) {
 787                                         bb_error_msg("too few parameters for line \"%s\"", buf);
 788                                         return NULL;
 789                                 }
 790
 791                                 /* ship any trailing whitespace */
 792                                 while (isspace(*buf_ptr)) {
 793                                         ++buf_ptr;
 794                                 }
 795
 796                                 if (buf_ptr[0] != '\0') {
 797                                         bb_error_msg("too many parameters \"%s\"", buf);
 798                                         return NULL;
 799                                 }
 800
 801                                 currif->iface = bb_xstrdup(iface_name);
 802
 803                                 currif->address_family = get_address_family(addr_fams, address_family_name);
 804                                 if (!currif->address_family) {
 805                                         bb_error_msg("unknown address type \"%s\"", address_family_name);
 806                                         return NULL;
 807                                 }
 808
 809                                 currif->method = get_method(currif->address_family, method_name);
 810                                 if (!currif->method) {
 811                                         bb_error_msg("unknown method \"%s\"", method_name);
 812                                         return NULL;
 813                                 }
 814
 815                                 currif->automatic = 1;
 816                                 currif->max_options = 0;
 817                                 currif->n_options = 0;
 818                                 currif->option = NULL;
 819
 820                                 {
 821                                         struct interface_defn_t *tmp;
 822                                         llist_t *iface_list;
 823                                         iface_list = defn->ifaces;
 824                                         while (iface_list) {
 825                                                 tmp = (struct interface_defn_t *) iface_list->data;
 826                                                 if (duplicate_if(tmp, currif)) {
 827                                                         bb_error_msg("duplicate interface \"%s\"", tmp->iface);
 828                                                         return NULL;
 829                                                 }
 830                                                 iface_list = iface_list->link;
 831                                         }
 832
 833                                         defn->ifaces = llist_add_to_end(defn->ifaces, (char*)currif);
 834                                 }
 835                                 debug_noise("iface %s %s %s\n", currif->iface, address_family_name, method_name);
 836                         }
 837                         currently_processing = IFACE;
 838                 } else if (strcmp(firstword, "auto") == 0) {
 839                         while ((firstword = next_word(&buf_ptr)) != NULL) {
 840
 841                                 /* Check the interface isnt already listed */
 842                                 if (find_list_string(defn->autointerfaces, firstword)) {
 843                                         bb_perror_msg_and_die("interface declared auto twice \"%s\"", buf);
 844                                 }
 845
 846                                 /* Add the interface to the list */
 847                                 defn->autointerfaces = llist_add_to_end(defn->autointerfaces, strdup(firstword));
 848                                 debug_noise("\nauto %s\n", firstword);
 849                         }
 850                         currently_processing = NONE;
 851                 } else {
 852                         switch (currently_processing) {
 853                                 case IFACE:
 854                                         {
 855                                                 int i;
 856
 857                                                 if (bb_strlen(buf_ptr) == 0) {
 858                                                         bb_error_msg("option with empty value \"%s\"", buf);
 859                                                         return NULL;
 860                                                 }
 861
 862                                                 if (strcmp(firstword, "up") != 0
 863                                                                 && strcmp(firstword, "down") != 0
 864                                                                 && strcmp(firstword, "pre-up") != 0
 865                                                                 && strcmp(firstword, "post-down") != 0) {
 866                                                         for (i = 0; i < currif->n_options; i++) {
 867                                                                 if (strcmp(currif->option[i].name, firstword) == 0) {
 868                                                                         bb_error_msg("duplicate option \"%s\"", buf);
 869                                                                         return NULL;
 870                                                                 }
 871                                                         }
 872                                                 }
 873                                         }
 874                                         if (currif->n_options >= currif->max_options) {
 875                                                 struct variable_t *opt;
 876
 877                                                 currif->max_options = currif->max_options + 10;
 878                                                 opt = xrealloc(currif->option, sizeof(*opt) * currif->max_options);
 879                                                 currif->option = opt;
 880                                         }
 881                                         currif->option[currif->n_options].name = bb_xstrdup(firstword);
 882                                         currif->option[currif->n_options].value = bb_xstrdup(buf_ptr);
 883                                         if (!currif->option[currif->n_options].name) {
 884                                                 perror(filename);
 885                                                 return NULL;
 886                                         }
 887                                         if (!currif->option[currif->n_options].value) {
 888                                                 perror(filename);
 889                                                 return NULL;
 890                                         }
 891                                         debug_noise("\t%s=%s\n", currif->option[currif->n_options].name,
 892                                                         currif->option[currif->n_options].value);
 893                                         currif->n_options++;
 894                                         break;
 895                                 case MAPPING:
 896 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 897                                         if (strcmp(firstword, "script") == 0) {
 898                                                 if (currmap->script != NULL) {
 899                                                         bb_error_msg("duplicate script in mapping \"%s\"", buf);
 900                                                         return NULL;
 901                                                 } else {
 902                                                         currmap->script = bb_xstrdup(next_word(&buf_ptr));
 903                                                 }
 904                                         } else if (strcmp(firstword, "map") == 0) {
 905                                                 if (currmap->max_mappings == currmap->n_mappings) {
 906                                                         currmap->max_mappings = currmap->max_mappings * 2 + 1;
 907                                                         currmap->mapping = xrealloc(currmap->mapping, sizeof(char *) * currmap->max_mappings);
 908                                                 }
 909                                                 currmap->mapping[currmap->n_mappings] = bb_xstrdup(next_word(&buf_ptr));
 910                                                 currmap->n_mappings++;
 911                                         } else {
 912                                                 bb_error_msg("misplaced option \"%s\"", buf);
 913                                                 return NULL;
 914                                         }
 915 #endif
 916                                         break;
 917                                 case NONE:
 918                                 default:
 919                                         bb_error_msg("misplaced option \"%s\"", buf);
 920                                         return NULL;
 921                         }
 922                 }
 923                 free(buf);
 924         }
 925         if (ferror(f) != 0) {
 926                 bb_perror_msg_and_die("%s", filename);
 927         }
 928         fclose(f);
 929
 930         return defn;
 931 }
 932
 933 static char *setlocalenv(char *format, char *name, char *value)
 934 {
 935         char *result;
 936         char *here;
 937         char *there;
 938
 939         result = xmalloc(bb_strlen(format) + bb_strlen(name) + bb_strlen(value) + 1);
 940
 941         sprintf(result, format, name, value);
 942
 943         for (here = there = result; *there != '=' && *there; there++) {
 944                 if (*there == '-')
 945                         *there = '_';
 946                 if (isalpha(*there))
 947                         *there = toupper(*there);
 948
 949                 if (isalnum(*there) || *there == '_') {
 950                         *here = *there;
 951                         here++;
 952                 }
 953         }
 954         memmove(here, there, bb_strlen(there) + 1);
 955
 956         return result;
 957 }
 958
 959 static void set_environ(struct interface_defn_t *iface, char *mode)
 960 {
 961         char **environend;
 962         int i;
 963         const int n_env_entries = iface->n_options + 5;
 964         char **ppch;
 965
 966         if (environ != NULL) {
 967                 for (ppch = environ; *ppch; ppch++) {
 968                         free(*ppch);
 969                         *ppch = NULL;
 970                 }
 971                 free(environ);
 972                 environ = NULL;
 973         }
 974         environ = xmalloc(sizeof(char *) * (n_env_entries + 1 /* for final NULL */ ));
 975         environend = environ;
 976         *environend = NULL;
 977
 978         for (i = 0; i < iface->n_options; i++) {
 979                 if (strcmp(iface->option[i].name, "up") == 0
 980                                 || strcmp(iface->option[i].name, "down") == 0
 981                                 || strcmp(iface->option[i].name, "pre-up") == 0
 982                                 || strcmp(iface->option[i].name, "post-down") == 0) {
 983                         continue;
 984                 }
 985                 *(environend++) = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value);
 986                 *environend = NULL;
 987         }
 988
 989         *(environend++) = setlocalenv("%s=%s", "IFACE", iface->iface);
 990         *environend = NULL;
 991         *(environend++) = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name);
 992         *environend = NULL;
 993         *(environend++) = setlocalenv("%s=%s", "METHOD", iface->method->name);
 994         *environend = NULL;
 995         *(environend++) = setlocalenv("%s=%s", "MODE", mode);
 996         *environend = NULL;
 997         *(environend++) = setlocalenv("%s=%s", "PATH", "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin");
 998         *environend = NULL;
 999 }
1000
1001 static int doit(char *str)
1002 {
1003         if (verbose || no_act) {
1004                 printf("%s\n", str);
1005         }
1006         if (!no_act) {
1007                 pid_t child;
1008                 int status;
1009
1010                 fflush(NULL);
1011                 switch (child = fork()) {
1012                         case -1:                /* failure */
1013                                 return 0;
1014                         case 0:         /* child */
1015                                 execle(DEFAULT_SHELL, DEFAULT_SHELL, "-c", str, NULL, environ);
1016                                 exit(127);
1017                 }
1018                 waitpid(child, &status, 0);
1019                 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
1020                         return 0;
1021                 }
1022         }
1023         return (1);
1024 }
1025
1026 static int execute_all(struct interface_defn_t *ifd, execfn *exec, const char *opt)
1027 {
1028         int i;
1029         char *buf;
1030         for (i = 0; i < ifd->n_options; i++) {
1031                 if (strcmp(ifd->option[i].name, opt) == 0) {
1032                         if (!(*exec) (ifd->option[i].value)) {
1033                                 return 0;
1034                         }
1035                 }
1036         }
1037
1038         bb_xasprintf(&buf, "run-parts /etc/network/if-%s.d", opt);
1039         if ((*exec)(buf) != 1) {
1040                 return 0;
1041         }
1042         return 1;
1043 }
1044
1045 static int check(char *str) {
1046         return str != NULL;
1047 }
1048
1049 static int iface_up(struct interface_defn_t *iface)
1050 {
1051         if (!iface->method->up(iface,check)) return -1;
1052         set_environ(iface, "start");
1053         if (!execute_all(iface, doit, "pre-up")) return 0;
1054         if (!iface->method->up(iface, doit)) return 0;
1055         if (!execute_all(iface, doit, "up")) return 0;
1056         return 1;
1057 }
1058
1059 static int iface_down(struct interface_defn_t *iface)
1060 {
1061         if (!iface->method->down(iface,check)) return -1;
1062         set_environ(iface, "stop");
1063         if (!execute_all(iface, doit, "down")) return 0;
1064         if (!iface->method->down(iface, doit)) return 0;
1065         if (!execute_all(iface, doit, "post-down")) return 0;
1066         return 1;
1067 }
1068
1069 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1070 static int popen2(FILE **in, FILE **out, char *command, ...)
1071 {
1072         va_list ap;
1073         char *argv[11] = { command };
1074         int argc;
1075         int infd[2], outfd[2];
1076         pid_t pid;
1077
1078         argc = 1;
1079         va_start(ap, command);
1080         while ((argc < 10) && (argv[argc] = va_arg(ap, char *))) {
1081                 argc++;
1082         }
1083         argv[argc] = NULL;      /* make sure */
1084         va_end(ap);
1085
1086         if (pipe(infd) != 0) {
1087                 return 0;
1088         }
1089
1090         if (pipe(outfd) != 0) {
1091                 close(infd[0]);
1092                 close(infd[1]);
1093                 return 0;
1094         }
1095
1096         fflush(NULL);
1097         switch (pid = fork()) {
1098                 case -1:                        /* failure */
1099                         close(infd[0]);
1100                         close(infd[1]);
1101                         close(outfd[0]);
1102                         close(outfd[1]);
1103                         return 0;
1104                 case 0:                 /* child */
1105                         dup2(infd[0], 0);
1106                         dup2(outfd[1], 1);
1107                         close(infd[0]);
1108                         close(infd[1]);
1109                         close(outfd[0]);
1110                         close(outfd[1]);
1111                         execvp(command, argv);
1112                         exit(127);
1113                 default:                        /* parent */
1114                         *in = fdopen(infd[1], "w");
1115                         *out = fdopen(outfd[0], "r");
1116                         close(infd[0]);
1117                         close(outfd[1]);
1118                         return pid;
1119         }
1120         /* unreached */
1121 }
1122
1123 static char *run_mapping(char *physical, struct mapping_defn_t * map)
1124 {
1125         FILE *in, *out;
1126         int i, status;
1127         pid_t pid;
1128
1129         char *logical = bb_xstrdup(physical);
1130
1131         /* Run the mapping script. */
1132         pid = popen2(&in, &out, map->script, physical, NULL);
1133
1134         /* popen2() returns 0 on failure. */
1135         if (pid == 0)
1136                 return logical;
1137
1138         /* Write mappings to stdin of mapping script. */
1139         for (i = 0; i < map->n_mappings; i++) {
1140                 fprintf(in, "%s\n", map->mapping[i]);
1141         }
1142         fclose(in);
1143         waitpid(pid, &status, 0);
1144
1145         if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
1146                 /* If the mapping script exited successfully, try to
1147                  * grab a line of output and use that as the name of the
1148                  * logical interface. */
1149                 char *new_logical = (char *)xmalloc(MAX_INTERFACE_LENGTH);
1150
1151                 if (fgets(new_logical, MAX_INTERFACE_LENGTH, out)) {
1152                         /* If we are able to read a line of output from the script,
1153                          * remove any trailing whitespace and use this value
1154                          * as the name of the logical interface. */
1155                         char *pch = new_logical + bb_strlen(new_logical) - 1;
1156
1157                         while (pch >= new_logical && isspace(*pch))
1158                                 *(pch--) = '\0';
1159
1160                         free(logical);
1161                         logical = new_logical;
1162                 } else {
1163                         /* If we are UNABLE to read a line of output, discard are
1164                          * freshly allocated memory. */
1165                         free(new_logical);
1166                 }
1167         }
1168
1169         fclose(out);
1170
1171         return logical;
1172 }
1173 #endif /* CONFIG_FEATURE_IFUPDOWN_MAPPING */
1174
1175 static llist_t *find_iface_state(llist_t *state_list, const char *iface)
1176 {
1177         unsigned short iface_len = bb_strlen(iface);
1178         llist_t *search = state_list;
1179
1180         while (search) {
1181                 if ((strncmp(search->data, iface, iface_len) == 0) &&
1182                                 (search->data[iface_len] == '=')) {
1183                         return(search);
1184                 }
1185                 search = search->link;
1186         }
1187         return(NULL);
1188 }
1189
1190 extern int ifupdown_main(int argc, char **argv)
1191 {
1192         int (*cmds) (struct interface_defn_t *) = NULL;
1193         struct interfaces_file_t *defn;
1194         FILE *state_fp = NULL;
1195         llist_t *state_list = NULL;
1196         llist_t *target_list = NULL;
1197         const char *interfaces = "/etc/network/interfaces";
1198         const char *statefile = "/var/run/ifstate";
1199
1200 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1201         int run_mappings = 1;
1202 #endif
1203         int do_all = 0;
1204         int force = 0;
1205         int any_failures = 0;
1206         int i;
1207
1208         if (bb_applet_name[2] == 'u') {
1209                 /* ifup command */
1210                 cmds = iface_up;
1211         } else {
1212                 /* ifdown command */
1213                 cmds = iface_down;
1214         }
1215
1216 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1217         while ((i = getopt(argc, argv, "i:hvnamf")) != -1)
1218 #else
1219                 while ((i = getopt(argc, argv, "i:hvnaf")) != -1)
1220 #endif
1221                 {
1222                         switch (i) {
1223                                 case 'i':       /* interfaces */
1224                                         interfaces = optarg;
1225                                         break;
1226                                 case 'v':       /* verbose */
1227                                         verbose = 1;
1228                                         break;
1229                                 case 'a':       /* all */
1230                                         do_all = 1;
1231                                         break;
1232                                 case 'n':       /* no-act */
1233                                         no_act = 1;
1234                                         break;
1235 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1236                                 case 'm':       /* no-mappings */
1237                                         run_mappings = 0;
1238                                         break;
1239 #endif
1240                                 case 'f':       /* force */
1241                                         force = 1;
1242                                         break;
1243                                 default:
1244                                         bb_show_usage();
1245                                         break;
1246                         }
1247                 }
1248
1249         if (argc - optind > 0) {
1250                 if (do_all) {
1251                         bb_show_usage();
1252                 }
1253         } else {
1254                 if (!do_all) {
1255                         bb_show_usage();
1256                 }
1257         }
1258
1259         debug_noise("reading %s file:\n", interfaces);
1260         defn = read_interfaces(interfaces);
1261         debug_noise("\ndone reading %s\n\n", interfaces);
1262
1263         if (!defn) {
1264                 exit(EXIT_FAILURE);
1265         }
1266
1267         if (no_act) {
1268                 state_fp = fopen(statefile, "r");
1269         }
1270
1271         /* Create a list of interfaces to work on */
1272         if (do_all) {
1273                 if (cmds == iface_up) {
1274                         target_list = defn->autointerfaces;
1275                 } else {
1276 #if 0
1277                         /* iface_down */
1278                         llist_t *new_item;
1279                         const llist_t *list = state_list;
1280                         while (list) {
1281                                 new_item = xmalloc(sizeof(llist_t));
1282                                 new_item->data = strdup(list->data);
1283                                 new_item->link = NULL;
1284                                 list = target_list;
1285                                 if (list == NULL)
1286                                         target_list = new_item;
1287                                 else {
1288                                         while (list->link) {
1289                                                 list = list->link;
1290                                         }
1291                                         list = new_item;
1292                                 }
1293                                 list = list->link;
1294                         }
1295                         target_list = defn->autointerfaces;
1296 #else
1297
1298                         /* iface_down */
1299                         const llist_t *list = state_list;
1300                         while (list) {
1301                                 target_list = llist_add_to_end(target_list, strdup(list->data));
1302                                 list = list->link;
1303                         }
1304                         target_list = defn->autointerfaces;
1305 #endif
1306                 }
1307         } else {
1308                 target_list = llist_add_to_end(target_list, argv[optind]);
1309         }
1310
1311
1312         /* Update the interfaces */
1313         while (target_list) {
1314                 llist_t *iface_list;
1315                 struct interface_defn_t *currif;
1316                 char *iface;
1317                 char *liface;
1318                 char *pch;
1319                 int okay = 0;
1320                 int cmds_ret;
1321
1322                 iface = strdup(target_list->data);
1323                 target_list = target_list->link;
1324
1325                 pch = strchr(iface, '=');
1326                 if (pch) {
1327                         *pch = '\0';
1328                         liface = strdup(pch + 1);
1329                 } else {
1330                         liface = strdup(iface);
1331                 }
1332
1333                 if (!force) {
1334                         const llist_t *iface_state = find_iface_state(state_list, iface);
1335
1336                         if (cmds == iface_up) {
1337                                 /* ifup */
1338                                 if (iface_state) {
1339                                         bb_error_msg("interface %s already configured", iface);
1340                                         continue;
1341                                 }
1342                         } else {
1343                                 /* ifdown */
1344                                 if (iface_state) {
1345                                         bb_error_msg("interface %s not configured", iface);
1346                                         continue;
1347                                 }
1348                         }
1349                 }
1350
1351 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1352                 if ((cmds == iface_up) && run_mappings) {
1353                         struct mapping_defn_t *currmap;
1354
1355                         for (currmap = defn->mappings; currmap; currmap = currmap->next) {
1356
1357                                 for (i = 0; i < currmap->n_matches; i++) {
1358                                         if (fnmatch(currmap->match[i], liface, 0) != 0)
1359                                                 continue;
1360                                         if (verbose) {
1361                                                 printf("Running mapping script %s on %s\n", currmap->script, liface);
1362                                         }
1363                                         liface = run_mapping(iface, currmap);
1364                                         break;
1365                                 }
1366                         }
1367                 }
1368 #endif
1369
1370
1371                 iface_list = defn->ifaces;
1372                 while (iface_list) {
1373                         currif = (struct interface_defn_t *) iface_list->data;
1374                         if (strcmp(liface, currif->iface) == 0) {
1375                                 char *oldiface = currif->iface;
1376
1377                                 okay = 1;
1378                                 currif->iface = iface;
1379
1380                                 debug_noise("\nConfiguring interface %s (%s)\n", liface, currif->address_family->name);
1381
1382                                 /* Call the cmds function pointer, does either iface_up() or iface_down() */
1383                                 cmds_ret = cmds(currif);
1384                                 if (cmds_ret == -1) {
1385                                         bb_error_msg("Don't seem to have all the variables for %s/%s.",
1386                                                         liface, currif->address_family->name);
1387                                         any_failures += 1;
1388                                 } else if (cmds_ret == 0) {
1389                                         any_failures += 1;
1390                                 }
1391
1392                                 currif->iface = oldiface;
1393                         }
1394                         iface_list = iface_list->link;
1395                 }
1396                 if (verbose) {
1397                         printf("\n");
1398                 }
1399
1400                 if (!okay && !force) {
1401                         bb_error_msg("Ignoring unknown interface %s", liface);
1402                         any_failures += 1;
1403                 } else {
1404                         llist_t *iface_state = find_iface_state(state_list, iface);
1405
1406                         if (cmds == iface_up) {
1407                                 char *newiface = xmalloc(bb_strlen(iface) + 1 + bb_strlen(liface) + 1);
1408                                 sprintf(newiface, "%s=%s", iface, liface);
1409                                 if (iface_state == NULL) {
1410                                         state_list = llist_add_to_end(state_list, newiface);
1411                                 } else {
1412                                         free(iface_state->data);
1413                                         iface_state->data = newiface;
1414                                 }
1415                         } else if (cmds == iface_down) {
1416                                 /* Remove an interface from the linked list */
1417                                 if (iface_state) {
1418                                         /* This needs to be done better */
1419                                         free(iface_state->data);
1420                                         free(iface_state->link);
1421                                         if (iface_state->link) {
1422                                                 iface_state->data = iface_state->link->data;
1423                                                 iface_state->link = iface_state->link->link;
1424                                         } else {
1425                                                 iface_state->data = NULL;
1426                                                 iface_state->link = NULL;
1427                                         }
1428                                 }
1429                         }
1430                 }
1431         }
1432
1433         /* Actually write the new state */
1434         if (!no_act) {
1435
1436                 if (state_fp)
1437                         fclose(state_fp);
1438                 state_fp = bb_xfopen(statefile, "a+");
1439
1440                 if (ftruncate(fileno(state_fp), 0) < 0) {
1441                         bb_error_msg_and_die("failed to truncate statefile %s: %s", statefile, strerror(errno));
1442                 }
1443
1444                 rewind(state_fp);
1445
1446                 while (state_list) {
1447                         if (state_list->data) {
1448                                 fputs(state_list->data, state_fp);
1449                                 fputc('\n', state_fp);
1450                         }
1451                         state_list = state_list->link;
1452                 }
1453                 fflush(state_fp);
1454         }
1455
1456         /* Cleanup */
1457         if (state_fp != NULL) {
1458                 fclose(state_fp);
1459                 state_fp = NULL;
1460         }
1461
1462         if (any_failures)
1463                 return 1;
1464         return 0;
1465 }