networking/ifupdown.c

   1 /*
   2  *  ifupdown for busybox
   3  *  Copyright (c) 2002 Glenn McGrath <bug1@optushome.com.au>
   4  *
   5  *  Based on ifupdown v 0.6.4 by Anthony Towns
   6  *  Copyright (c) 1999 Anthony Towns <aj@azure.humbug.org.au>
   7  *
   8  *  Changes to upstream version
   9  *  Remove checks for kernel version, assume kernel version 2.2.0 or better.
  10  *  Lines in the interfaces file cannot wrap.
  11  *  To adhere to the FHS, the default state file is /var/run/ifstate.
  12  *
  13  *  This program is free software; you can redistribute it and/or modify
  14  *  it under the terms of the GNU General Public License as published by
  15  *  the Free Software Foundation; either version 2 of the License, or
  16  *  (at your option) any later version.
  17  *
  18  *  This program is distributed in the hope that it will be useful,
  19  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *  GNU General Public License for more details.
  22  *
  23  *  You should have received a copy of the GNU General Public License
  24  *  along with this program; if not, write to the Free Software
  25  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26  */
  27
  28 #include <sys/stat.h>
  29 #include <sys/utsname.h>
  30 #include <sys/wait.h>
  31
  32 #include <ctype.h>
  33 #include <errno.h>
  34 #include <fcntl.h>
  35 #include <fnmatch.h>
  36 #include <getopt.h>
  37 #include <stdarg.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <unistd.h>
  42
  43 #include "libbb.h"
  44
  45 #define MAX_OPT_DEPTH 10
  46 #define EUNBALBRACK 10001
  47 #define EUNDEFVAR   10002
  48 #define EUNBALPER   10000
  49
  50 typedef struct interface_defn_s interface_defn_t;
  51
  52 typedef int (execfn)(char *command);
  53 typedef int (command_set)(interface_defn_t *ifd, execfn *e);
  54
  55 typedef struct method_s {
  56         char *name;
  57         command_set *up;
  58         command_set *down;
  59 } method_t;
  60
  61 typedef struct address_family_s {
  62         char *name;
  63         int n_methods;
  64         method_t *method;
  65 } address_family_t;
  66
  67 typedef struct mapping_defn_s {
  68         struct mapping_defn_s *next;
  69
  70         int max_matches;
  71         int n_matches;
  72         char **match;
  73
  74         char *script;
  75
  76         int max_mappings;
  77         int n_mappings;
  78         char **mapping;
  79 } mapping_defn_t;
  80
  81 typedef struct variable_s {
  82         char *name;
  83         char *value;
  84 } variable_t;
  85
  86 struct interface_defn_s {
  87         struct interface_defn_s *next;
  88
  89         char *iface;
  90         address_family_t *address_family;
  91         method_t *method;
  92
  93         int automatic;
  94
  95         int max_options;
  96         int n_options;
  97         variable_t *option;
  98 };
  99
 100 typedef struct interfaces_file_s {
 101         llist_t *autointerfaces;
 102         interface_defn_t *ifaces;
 103         mapping_defn_t *mappings;
 104 } interfaces_file_t;
 105
 106 static char no_act = 0;
 107 static char verbose = 0;
 108 static char **environ = NULL;
 109
 110 static void addstr(char **buf, size_t *len, size_t *pos, char *str, size_t str_length)
 111 {
 112         if (*pos + str_length >= *len) {
 113                 char *newbuf;
 114
 115                 newbuf = xrealloc(*buf, *len * 2 + str_length + 1);
 116                 *buf = newbuf;
 117                 *len = *len * 2 + str_length + 1;
 118         }
 119
 120         while (str_length-- >= 1) {
 121                 (*buf)[(*pos)++] = *str;
 122                 str++;
 123         }
 124         (*buf)[*pos] = '\0';
 125 }
 126
 127 static int strncmpz(char *l, char *r, size_t llen)
 128 {
 129         int i = strncmp(l, r, llen);
 130
 131         if (i == 0) {
 132                 return(-r[llen]);
 133         } else {
 134                 return(i);
 135         }
 136 }
 137
 138 static char *get_var(char *id, size_t idlen, interface_defn_t *ifd)
 139 {
 140         int i;
 141
 142         if (strncmpz(id, "iface", idlen) == 0) {
 143                 return (ifd->iface);
 144         } else {
 145                 for (i = 0; i < ifd->n_options; i++) {
 146                         if (strncmpz(id, ifd->option[i].name, idlen) == 0) {
 147                                 return (ifd->option[i].value);
 148                         }
 149                 }
 150         }
 151
 152         return(NULL);
 153 }
 154
 155 static char *parse(char *command, interface_defn_t *ifd)
 156 {
 157
 158         char *result = NULL;
 159         size_t pos = 0, len = 0;
 160         size_t old_pos[MAX_OPT_DEPTH] = { 0 };
 161         int okay[MAX_OPT_DEPTH] = { 1 };
 162         int opt_depth = 1;
 163
 164         while (*command) {
 165                 switch (*command) {
 166
 167                 default:
 168                         addstr(&result, &len, &pos, command, 1);
 169                         command++;
 170                         break;
 171                 case '\\':
 172                         if (command[1]) {
 173                                 addstr(&result, &len, &pos, command + 1, 1);
 174                                 command += 2;
 175                         } else {
 176                                 addstr(&result, &len, &pos, command, 1);
 177                                 command++;
 178                         }
 179                         break;
 180                 case '[':
 181                         if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) {
 182                                 old_pos[opt_depth] = pos;
 183                                 okay[opt_depth] = 1;
 184                                 opt_depth++;
 185                                 command += 2;
 186                         } else {
 187                                 addstr(&result, &len, &pos, "[", 1);
 188                                 command++;
 189                         }
 190                         break;
 191                 case ']':
 192                         if (command[1] == ']' && opt_depth > 1) {
 193                                 opt_depth--;
 194                                 if (!okay[opt_depth]) {
 195                                         pos = old_pos[opt_depth];
 196                                         result[pos] = '\0';
 197                                 }
 198                                 command += 2;
 199                         } else {
 200                                 addstr(&result, &len, &pos, "]", 1);
 201                                 command++;
 202                         }
 203                         break;
 204                 case '%':
 205                 {
 206                         char *nextpercent;
 207                         char *varvalue;
 208
 209                         command++;
 210                         nextpercent = strchr(command, '%');
 211                         if (!nextpercent) {
 212                                 errno = EUNBALPER;
 213                                 free(result);
 214                                 return (NULL);
 215                         }
 216
 217                         varvalue = get_var(command, nextpercent - command, ifd);
 218
 219                         if (varvalue) {
 220                                 addstr(&result, &len, &pos, varvalue, xstrlen(varvalue));
 221                         } else {
 222                                 okay[opt_depth - 1] = 0;
 223                         }
 224
 225                         command = nextpercent + 1;
 226                 }
 227                         break;
 228                 }
 229         }
 230
 231         if (opt_depth > 1) {
 232                 errno = EUNBALBRACK;
 233                 free(result);
 234                 return(NULL);
 235         }
 236
 237         if (!okay[0]) {
 238                 errno = EUNDEFVAR;
 239                 free(result);
 240                 return(NULL);
 241         }
 242
 243         return(result);
 244 }
 245
 246 static int execute(char *command, interface_defn_t *ifd, execfn *exec)
 247 {
 248         char *out;
 249         int ret;
 250
 251         out = parse(command, ifd);
 252         if (!out) {
 253                 return(0);
 254         }
 255
 256         ret = (*exec) (out);
 257
 258         free(out);
 259         return(ret);
 260 }
 261
 262 #ifdef CONFIG_FEATURE_IFUPDOWN_IPX
 263 static int static_up_ipx(interface_defn_t *ifd, execfn *exec)
 264 {
 265         if (!execute("ipx_interface add %iface% %frame% %netnum%", ifd, exec)) {
 266                 return(0);
 267         }
 268         return(1);
 269 }
 270
 271 static int static_down_ipx(interface_defn_t *ifd, execfn *exec)
 272 {
 273         if (!execute("ipx_interface del %iface% %frame%", ifd, exec)) {
 274                 return(0);
 275         }
 276         return(1);
 277 }
 278
 279 static int dynamic_up(interface_defn_t *ifd, execfn *exec)
 280 {
 281         if (!execute("ipx_interface add %iface% %frame%", ifd, exec)) {
 282                 return(0);
 283         }
 284         return(1);
 285 }
 286
 287 static int dynamic_down(interface_defn_t *ifd, execfn *exec)
 288 {
 289         if (!execute("ipx_interface del %iface% %frame%", ifd, exec)) {
 290                 return(0);
 291         }
 292         return(1);
 293 }
 294
 295 static method_t methods_ipx[] = {
 296         { "dynamic", dynamic_up, dynamic_down, },
 297         { "static", static_up_ipx, static_down_ipx, },
 298 };
 299
 300 address_family_t addr_ipx = {
 301         "ipx",
 302         sizeof(methods_ipx) / sizeof(method_t),
 303         methods_ipx
 304 };
 305 #endif /* IFUP_FEATURE_IPX */
 306
 307 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
 308 static int loopback_up6(interface_defn_t *ifd, execfn *exec)
 309 {
 310 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 311         if (!execute("ip link set %iface% up", ifd, exec))
 312                 return(0);
 313         if (!execute("ip addr add ::1 dev %iface%", ifd, exec))
 314                 return(0);
 315 #else
 316         if (!execute("ifconfig %iface% add ::1", ifd, exec))
 317                 return(0);
 318 #endif
 319         return(1);
 320 }
 321
 322 static int loopback_down6(interface_defn_t *ifd, execfn *exec)
 323 {
 324 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 325         if (!execute("ip link set %iface% down", ifd, exec))
 326                 return(0);
 327 #else
 328         if (!execute("ifconfig %iface% del ::1", ifd, exec))
 329                 return(0);
 330 #endif
 331         return(1);
 332 }
 333
 334 static int static_up6(interface_defn_t *ifd, execfn *exec)
 335 {
 336 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 337         if (!execute("ip link set %iface% up", ifd, exec))
 338                 return(0);
 339         if (!execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec))
 340                 return(0);
 341         if (!execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec))
 342                 return(0);
 343 #else
 344         if (!execute("ifconfig %iface% [[media %media%]] [[hw %hwaddress%]] [[mtu %mtu%]] up", ifd, exec)) {
 345                 return(0);
 346         }
 347         if (!execute("ifconfig %iface% add %address%/%netmask%", ifd, exec)) {
 348                 return(0);
 349         }
 350         if (!execute("[[ route -A inet6 add ::/0 gw %gateway% ]]", ifd, exec)) {
 351                 return(0);
 352         }
 353 #endif
 354         return(1);
 355 }
 356
 357 static int static_down6(interface_defn_t *ifd, execfn *exec)
 358 {
 359 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 360         if (!execute("ip link set %iface% down", ifd, exec))
 361                 return(0);
 362 #else
 363         if (!execute("ifconfig %iface% down", ifd, exec)) {
 364                 return(0);
 365         }
 366 #endif
 367         return(1);
 368 }
 369
 370 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 371 static int v4tunnel_up(interface_defn_t *ifd, execfn *exec)
 372 {
 373         if (!execute("ip tunnel add %iface% mode sit remote %endpoint% [[local %local%]] [[ttl %ttl%]]", ifd, exec)) {
 374                 return(0);
 375         }
 376         if (!execute("ip link set %iface% up", ifd, exec)) {
 377                 return(0);
 378         }
 379         if (!execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec)) {
 380                 return(0);
 381         }
 382         if (!execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec)) {
 383                 return(0);
 384         }
 385         return(1);
 386 }
 387
 388 static int v4tunnel_down(interface_defn_t * ifd, execfn * exec)
 389 {
 390         if (!execute("ip tunnel del %iface%", ifd, exec)) {
 391                 return(0);
 392         }
 393         return(1);
 394 }
 395 #endif
 396
 397 static method_t methods6[] = {
 398 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 399         { "v4tunnel", v4tunnel_up, v4tunnel_down, },
 400 #endif
 401         { "static", static_up6, static_down6, },
 402         { "loopback", loopback_up6, loopback_down6, },
 403 };
 404
 405 address_family_t addr_inet6 = {
 406         "inet6",
 407         sizeof(methods6) / sizeof(method_t),
 408         methods6
 409 };
 410 #endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */
 411
 412 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
 413 static int loopback_up(interface_defn_t *ifd, execfn *exec)
 414 {
 415 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 416         if (!execute("ip link set %iface% up", ifd, exec))
 417                 return(0);
 418         if (!execute("ip addr add 127.0.0.1 dev %iface%", ifd, exec))
 419                 return(0);
 420 #else
 421         if (!execute("ifconfig %iface% 127.0.0.1 up", ifd, exec)) {
 422                 return(0);
 423         }
 424 #endif
 425         return(1);
 426 }
 427
 428 static int loopback_down(interface_defn_t *ifd, execfn *exec)
 429 {
 430 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 431         if (!execute("ip -f inet addr flush dev %iface%", ifd, exec))
 432                 return(0);
 433         if (!execute("ip link set %iface% down", ifd, exec))
 434                 return(0);
 435 #else
 436         if (!execute("ifconfig %iface% 127.0.0.1 down", ifd, exec)) {
 437                 return(0);
 438         }
 439 #endif
 440         return(1);
 441 }
 442
 443 static int static_up(interface_defn_t *ifd, execfn *exec)
 444 {
 445 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 446         if (!execute("ip link set %iface% up", ifd, exec))
 447                 return(0);
 448         if (!execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec))
 449                 return(0);
 450         if (!execute("[[ ip route add default via %gateway% dev %iface% ]]", ifd, exec))
 451                 return(0);
 452 #else
 453         if (!execute("ifconfig %iface% %address% netmask %netmask% [[broadcast %broadcast%]]    [[pointopoint %pointopoint%]] [[media %media%]] [[mtu %mtu%]]   [[hw %hwaddress%]] up",
 454                  ifd, exec)) {
 455                 return(0);
 456         }
 457         if (!execute("[[ route add default gw %gateway% %iface% ]]", ifd, exec)) {
 458                 return(0);
 459         }
 460 #endif
 461         return(1);
 462 }
 463
 464 static int static_down(interface_defn_t *ifd, execfn *exec)
 465 {
 466 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 467         if (!execute("[[ ip route del default via %gateway% dev %iface% ]]", ifd, exec))
 468                 return(0);
 469         if (!execute("ip -f inet addr flush dev %iface%", ifd, exec))
 470                 return(0);
 471         if (!execute("ip link set %iface% down", ifd, exec))
 472                 return(0);
 473 #else
 474         if (!execute("[[ route del default gw %gateway% %iface% ]]", ifd, exec)) {
 475                 return(0);
 476         }
 477         if (!execute("ifconfig %iface% down", ifd, exec)) {
 478                 return(0);
 479         }
 480 #endif
 481         return(1);
 482 }
 483
 484 static int execable(char *program)
 485 {
 486         struct stat buf;
 487         if (0 == stat(program, &buf)) {
 488                 if (S_ISREG(buf.st_mode) && (S_IXUSR & buf.st_mode)) {
 489                         return(1);
 490                 }
 491         }
 492         return(0);
 493 }
 494
 495 static int dhcp_up(interface_defn_t *ifd, execfn *exec)
 496 {
 497         if (execable("/sbin/dhclient")) {
 498                 if (!execute("dhclient -pf /var/run/dhclient.%iface%.pid %iface%", ifd, exec)) {
 499                         return(0);
 500                 }
 501         } else if (execable("/sbin/pump")) {
 502                 if (!execute("pump -i %iface% [[-h %hostname%]] [[-l %leasehours%]]", ifd, exec)) {
 503                         return(0);
 504                 }
 505         } else if (execable("/sbin/udhcpc")) {
 506                 if (!execute("udhcpc -n -p /var/run/udhcpc.%iface%.pid -i %iface% [[-H %hostname%]] [[-c %clientid%]]", ifd, exec)) {
 507                         return 0;
 508                 }
 509         } else if (execable("/sbin/dhcpcd")) {
 510                 if (!execute("dhcpcd [[-h %hostname%]] [[-i %vendor%]] [[-I %clientid%]] [[-l %leasetime%]] %iface%", ifd, exec)) {
 511                         return(0);
 512                 }
 513         }
 514         return(1);
 515 }
 516
 517 static int dhcp_down(interface_defn_t *ifd, execfn *exec)
 518 {
 519         if (execable("/sbin/dhclient")) {
 520                 if (!execute("kill -9 `cat /var/run/udhcpc.%iface%.pid`", ifd, exec)) {
 521                         return(0);
 522                 }
 523         } else if (execable("/sbin/pump")) {
 524                 if (!execute("pump -i %iface% -k", ifd, exec)) {
 525                         return(0);
 526                 }
 527         } else if (execable("/sbin/udhcpc")) {
 528                 if (!execute("kill -9 `cat /var/run/udhcpc.%iface%.pid`", ifd, exec)) {
 529                         return(0);
 530                 }
 531         } else if (execable("/sbin/dhcpcd")) {
 532                 if (!execute("dhcpcd -k %iface%", ifd, exec)) {
 533                         return(0);
 534                 }
 535         }
 536         if (!execute("ifconfig %iface% down", ifd, exec)) {
 537                 return(0);
 538         }
 539         return(1);
 540 }
 541
 542 static int bootp_up(interface_defn_t *ifd, execfn *exec)
 543 {
 544         if (!execute("bootpc [[--bootfile %bootfile%]] --dev %iface% [[--server %server%]]            [[--hwaddr %hwaddr%]] --returniffail --serverbcast", ifd, exec)) {
 545                 return 0;
 546         }
 547         return 1;
 548 }
 549
 550 static int bootp_down(interface_defn_t *ifd, execfn *exec)
 551 {
 552         if (!execute("ifconfig down %iface%", ifd, exec)) {
 553                 return 0;
 554         }
 555         return 1;
 556 }
 557
 558 static int ppp_up(interface_defn_t *ifd, execfn *exec)
 559 {
 560         if (!execute("pon [[%provider%]]", ifd, exec)) {
 561                 return 0;
 562         }
 563         return 1;
 564 }
 565
 566 static int ppp_down(interface_defn_t *ifd, execfn *exec)
 567 {
 568         if (!execute("poff [[%provider%]]", ifd, exec)) {
 569                 return 0;
 570         }
 571         return 1;
 572 }
 573
 574 static int wvdial_up(interface_defn_t *ifd, execfn *exec)
 575 {
 576         if (!execute("/sbin/start-stop-daemon --start -x /usr/bin/wvdial -p /var/run/wvdial.%iface% -b -m -- [[ %provider% ]]", ifd, exec)) {
 577                 return 0;
 578         }
 579         return 1;
 580 }
 581
 582 static int wvdial_down(interface_defn_t *ifd, execfn *exec)
 583 {
 584         if (!execute ("/sbin/start-stop-daemon --stop -x /usr/bin/wvdial -p /var/run/wvdial.%iface% -s 2", ifd, exec)) {
 585                 return 0;
 586         }
 587         return 1;
 588 }
 589
 590 static method_t methods[] = {
 591         { "wvdial", wvdial_up, wvdial_down, },
 592         { "ppp", ppp_up, ppp_down, },
 593         { "static", static_up, static_down, },
 594         { "bootp", bootp_up, bootp_down, },
 595         { "dhcp", dhcp_up, dhcp_down, },
 596         { "loopback", loopback_up, loopback_down, },
 597 };
 598
 599 address_family_t addr_inet = {
 600         "inet",
 601         sizeof(methods) / sizeof(method_t),
 602         methods
 603 };
 604
 605 #endif  /* ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 */
 606
 607 static char *next_word(char *buf, char *word, int maxlen)
 608 {
 609         if (!buf)
 610                 return NULL;
 611         if (!*buf)
 612                 return NULL;
 613
 614         while (!isspace(*buf) && *buf) {
 615                 if (maxlen-- > 1)
 616                         *word++ = *buf;
 617                 buf++;
 618         }
 619         if (maxlen > 0) {
 620                 *word = '\0';
 621         }
 622
 623         while (isspace(*buf) && *buf) {
 624                 buf++;
 625         }
 626
 627         return buf;
 628 }
 629
 630 static address_family_t *get_address_family(address_family_t *af[], char *name)
 631 {
 632         int i;
 633
 634         for (i = 0; af[i]; i++) {
 635                 if (strcmp(af[i]->name, name) == 0) {
 636                         return af[i];
 637                 }
 638         }
 639         return NULL;
 640 }
 641
 642 static method_t *get_method(address_family_t *af, char *name)
 643 {
 644         int i;
 645
 646         for (i = 0; i < af->n_methods; i++) {
 647                 if (strcmp(af->method[i].name, name) == 0) {
 648                         return &af->method[i];
 649                 }
 650         }
 651         return(NULL);
 652 }
 653
 654 static int duplicate_if(interface_defn_t *ifa, interface_defn_t *ifb)
 655 {
 656         if (strcmp(ifa->iface, ifb->iface) != 0) {
 657                 return(0);
 658         }
 659         if (ifa->address_family != ifb->address_family) {
 660                 return(0);
 661         }
 662         return(1);
 663 }
 664
 665 static const llist_t *find_list_string(const llist_t *list, const char *string)
 666 {
 667         while (list) {
 668                 if (strcmp(list->data, string) == 0) {
 669                         return(list);
 670                 }
 671                 list = list->link;
 672         }
 673         return(NULL);
 674 }
 675
 676 static interfaces_file_t *read_interfaces(char *filename)
 677 {
 678         interface_defn_t *currif = NULL;
 679         interfaces_file_t *defn;
 680 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 681         mapping_defn_t *currmap = NULL;
 682 #endif
 683         FILE *f;
 684         char firstword[80];
 685         char *buf = NULL;
 686         char *rest;
 687 //      int line;
 688
 689         enum { NONE, IFACE, MAPPING } currently_processing = NONE;
 690
 691         defn = xmalloc(sizeof(interfaces_file_t));
 692 //      defn->max_autointerfaces = defn->n_autointerfaces = 0;
 693         defn->autointerfaces = NULL;
 694         defn->mappings = NULL;
 695         defn->ifaces = NULL;
 696         f = fopen(filename, "r");
 697         if (f == NULL) {
 698                 return NULL;
 699         }
 700
 701         while ((buf = get_line_from_file(f)) != NULL) {
 702                 char *end;
 703
 704                 if (buf[0] == '#') {
 705                         continue;
 706                 }
 707                 end = last_char_is(buf, '\n');
 708                 if (end) {
 709                         *end = '\0';
 710                 }
 711                 while ((end = last_char_is(buf, ' ')) != NULL) {
 712                         *end = '\0';
 713                 }
 714                 rest = next_word(buf, firstword, 80);
 715                 if (rest == NULL) {
 716                         continue;       /* blank line */
 717                 }
 718
 719                 if (strcmp(firstword, "mapping") == 0) {
 720 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 721                         currmap = xmalloc(sizeof(mapping_defn_t));
 722                         currmap->max_matches = 0;
 723                         currmap->n_matches = 0;
 724                         currmap->match = NULL;
 725
 726                         while ((rest = next_word(rest, firstword, 80))) {
 727                                 if (currmap->max_matches == currmap->n_matches) {
 728                                         currmap->max_matches = currmap->max_matches * 2 + 1;
 729                                         currmap->match = xrealloc(currmap->match, sizeof(currmap->match) * currmap->max_matches);
 730                                 }
 731
 732                                 currmap->match[currmap->n_matches++] = xstrdup(firstword);
 733                         }
 734                         currmap->max_mappings = 0;
 735                         currmap->n_mappings = 0;
 736                         currmap->mapping = NULL;
 737                         currmap->script = NULL;
 738                         {
 739                                 mapping_defn_t **where = &defn->mappings;
 740                                 while (*where != NULL) {
 741                                         where = &(*where)->next;
 742                                 }
 743                                 *where = currmap;
 744                                 currmap->next = NULL;
 745                         }
 746 #endif
 747                         currently_processing = MAPPING;
 748                 } else if (strcmp(firstword, "iface") == 0) {
 749                         {
 750                                 char iface_name[80];
 751                                 char address_family_name[80];
 752                                 char method_name[80];
 753                                 address_family_t *addr_fams[] = {
 754 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
 755                                         &addr_inet,
 756 #endif
 757 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
 758                                         &addr_inet6,
 759 #endif
 760 #ifdef CONFIG_FEATURE_IFUPDOWN_IPX
 761                                         &addr_ipx,
 762 #endif
 763                                         NULL
 764                                 };
 765
 766                                 currif = xmalloc(sizeof(interface_defn_t));
 767
 768                                 rest = next_word(rest, iface_name, 80);
 769                                 rest = next_word(rest, address_family_name, 80);
 770                                 rest = next_word(rest, method_name, 80);
 771
 772                                 if (rest == NULL) {
 773                                         error_msg("too few parameters for line \"%s\"", buf);
 774                                         return NULL;
 775                                 }
 776
 777                                 if (rest[0] != '\0') {
 778                                         error_msg("too many parameters \"%s\"", buf);
 779                                         return NULL;
 780                                 }
 781
 782                                 currif->iface = xstrdup(iface_name);
 783
 784                                 currif->address_family = get_address_family(addr_fams, address_family_name);
 785                                 if (!currif->address_family) {
 786                                         error_msg("unknown address type \"%s\"", buf);
 787                                         return NULL;
 788                                 }
 789
 790                                 currif->method = get_method(currif->address_family, method_name);
 791                                 if (!currif->method) {
 792                                         error_msg("unknown method \"%s\"", buf);
 793                                         return NULL;
 794                                 }
 795
 796                                 currif->automatic = 1;
 797                                 currif->max_options = 0;
 798                                 currif->n_options = 0;
 799                                 currif->option = NULL;
 800
 801
 802                                 {
 803                                         interface_defn_t **where = &defn->ifaces;
 804
 805                                         while (*where != NULL) {
 806                                                 if (duplicate_if(*where, currif)) {
 807                                                         error_msg("duplicate interface \"%s\"", buf);
 808                                                         return NULL;
 809                                                 }
 810                                                 where = &(*where)->next;
 811                                         }
 812
 813                                         *where = currif;
 814                                         currif->next = NULL;
 815                                 }
 816                         }
 817                         currently_processing = IFACE;
 818                 } else if (strcmp(firstword, "auto") == 0) {
 819                         while ((rest = next_word(rest, firstword, 80))) {
 820
 821                                 /* Check the interface isnt already listed */
 822                                 if (find_list_string(defn->autointerfaces, firstword)) {
 823                                         perror_msg_and_die("interface declared auto twice \"%s\"", buf);
 824                                 }
 825
 826                                 /* Add the interface to the list */
 827                                 defn->autointerfaces = llist_add_to(defn->autointerfaces, strdup(firstword));
 828                         }
 829                         currently_processing = NONE;
 830                 } else {
 831                         switch (currently_processing) {
 832                         case IFACE:
 833                         {
 834                                 int i;
 835
 836                                 if (xstrlen(rest) == 0) {
 837                                         error_msg("option with empty value \"%s\"", buf);
 838                                         return NULL;
 839                                 }
 840
 841                                 if (strcmp(firstword, "up") != 0
 842                                         && strcmp(firstword, "down") != 0
 843                                         && strcmp(firstword, "pre-up") != 0
 844                                         && strcmp(firstword, "post-down") != 0) {
 845                                         for (i = 0; i < currif->n_options; i++) {
 846                                                 if (strcmp(currif->option[i].name, firstword) == 0) {
 847                                                         error_msg("duplicate option \"%s\"", buf);
 848                                                         return NULL;
 849                                                 }
 850                                         }
 851                                 }
 852                         }
 853                                 if (currif->n_options >= currif->max_options) {
 854                                         variable_t *opt;
 855
 856                                         currif->max_options = currif->max_options + 10;
 857                                         opt = xrealloc(currif->option, sizeof(*opt) * currif->max_options);
 858                                         currif->option = opt;
 859                                 }
 860                                 currif->option[currif->n_options].name = xstrdup(firstword);
 861                                 currif->option[currif->n_options].value = xstrdup(rest);
 862                                 if (!currif->option[currif->n_options].name) {
 863                                         perror(filename);
 864                                         return NULL;
 865                                 }
 866                                 if (!currif->option[currif->n_options].value) {
 867                                         perror(filename);
 868                                         return NULL;
 869                                 }
 870                                 currif->n_options++;
 871                                 break;
 872                         case MAPPING:
 873 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 874                                 if (strcmp(firstword, "script") == 0) {
 875                                         if (currmap->script != NULL) {
 876                                                 error_msg("duplicate script in mapping \"%s\"", buf);
 877                                                 return NULL;
 878                                         } else {
 879                                                 currmap->script = xstrdup(rest);
 880                                         }
 881                                 } else if (strcmp(firstword, "map") == 0) {
 882                                         if (currmap->max_mappings == currmap->n_mappings) {
 883                                                 currmap->max_mappings = currmap->max_mappings * 2 + 1;
 884                                                 currmap->mapping = xrealloc(currmap->mapping, sizeof(char *) * currmap->max_mappings);
 885                                         }
 886                                         currmap->mapping[currmap->n_mappings] = xstrdup(rest);
 887                                         currmap->n_mappings++;
 888                                 } else {
 889                                         error_msg("misplaced option \"%s\"", buf);
 890                                         return NULL;
 891                                 }
 892 #endif
 893                                 break;
 894                         case NONE:
 895                         default:
 896                                 error_msg("misplaced option \"%s\"", buf);
 897                                 return NULL;
 898                         }
 899                 }
 900         }
 901         if (ferror(f) != 0) {
 902                 perror_msg("%s", filename);
 903                 return NULL;
 904         }
 905         fclose(f);
 906
 907         return defn;
 908 }
 909
 910 static int check(char *str)
 911 {
 912         return (str != NULL);
 913 }
 914
 915 static char *setlocalenv(char *format, char *name, char *value)
 916 {
 917         char *result;
 918         char *here;
 919         char *there;
 920
 921         result = xmalloc(xstrlen(format) + xstrlen(name) + xstrlen(value) + 1);
 922
 923         sprintf(result, format, name, value);
 924
 925         for (here = there = result; *there != '=' && *there; there++) {
 926                 if (*there == '-')
 927                         *there = '_';
 928                 if (isalpha(*there))
 929                         *there = toupper(*there);
 930
 931                 if (isalnum(*there) || *there == '_') {
 932                         *here = *there;
 933                         here++;
 934                 }
 935         }
 936         memmove(here, there, xstrlen(there) + 1);
 937
 938         return result;
 939 }
 940
 941 static void set_environ(interface_defn_t *iface, char *mode)
 942 {
 943         char **environend;
 944         int i;
 945         const int n_env_entries = iface->n_options + 5;
 946         char **ppch;
 947
 948         if (environ != NULL) {
 949                 for (ppch = environ; *ppch; ppch++) {
 950                         free(*ppch);
 951                         *ppch = NULL;
 952                 }
 953                 free(environ);
 954                 environ = NULL;
 955         }
 956         environ = xmalloc(sizeof(char *) * (n_env_entries + 1 /* for final NULL */ ));
 957         environend = environ;
 958         *environend = NULL;
 959
 960         for (i = 0; i < iface->n_options; i++) {
 961                 if (strcmp(iface->option[i].name, "up") == 0
 962                         || strcmp(iface->option[i].name, "down") == 0
 963                         || strcmp(iface->option[i].name, "pre-up") == 0
 964                         || strcmp(iface->option[i].name, "post-down") == 0) {
 965                         continue;
 966                 }
 967                 *(environend++) = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value);
 968                 *environend = NULL;
 969         }
 970
 971         *(environend++) = setlocalenv("%s=%s", "IFACE", iface->iface);
 972         *environend = NULL;
 973         *(environend++) = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name);
 974         *environend = NULL;
 975         *(environend++) = setlocalenv("%s=%s", "METHOD", iface->method->name);
 976         *environend = NULL;
 977         *(environend++) = setlocalenv("%s=%s", "MODE", mode);
 978         *environend = NULL;
 979         *(environend++) = setlocalenv("%s=%s", "PATH", "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin");
 980         *environend = NULL;
 981 }
 982
 983 static int doit(char *str)
 984 {
 985         if (verbose || no_act) {
 986                 error_msg("%s", str);
 987         }
 988         if (!no_act) {
 989                 pid_t child;
 990                 int status;
 991
 992                 fflush(NULL);
 993                 switch (child = fork()) {
 994                 case -1:                /* failure */
 995                         return 0;
 996                 case 0:         /* child */
 997                         execle("/bin/sh", "/bin/sh", "-c", str, NULL, environ);
 998                         exit(127);
 999                 }
1000                 waitpid(child, &status, 0);
1001                 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
1002                         return 0;
1003                 }
1004         }
1005         return (1);
1006 }
1007
1008 static int execute_all(interface_defn_t *ifd, execfn *exec, const char *opt)
1009 {
1010         int i;
1011         char *buf;
1012
1013         for (i = 0; i < ifd->n_options; i++) {
1014                 if (strcmp(ifd->option[i].name, opt) == 0) {
1015                         if (!(*exec) (ifd->option[i].value)) {
1016                                 return 0;
1017                         }
1018                 }
1019         }
1020
1021         buf = xmalloc(xstrlen(opt) + 19);
1022         sprintf(buf, "/etc/network/if-%s.d", opt);
1023         run_parts(&buf, 0);
1024         free(buf);
1025         return (1);
1026 }
1027
1028 static int iface_up(interface_defn_t *iface)
1029 {
1030         if (!iface->method->up(iface, check)) {
1031                 return (-1);
1032         }
1033
1034         set_environ(iface, "start");
1035         if (!execute_all(iface, doit, "pre-up")) {
1036                 return (0);
1037         }
1038         if (!iface->method->up(iface, doit)) {
1039                 return (0);
1040         }
1041         if (!execute_all(iface, doit, "up")) {
1042                 return (0);
1043         }
1044
1045         return (1);
1046 }
1047
1048 static int iface_down(interface_defn_t *iface)
1049 {
1050         if (!iface->method->down(iface, check)) {
1051                 return (-1);
1052         }
1053         set_environ(iface, "stop");
1054         if (!execute_all(iface, doit, "down")) {
1055                 return (0);
1056         }
1057         if (!iface->method->down(iface, doit)) {
1058                 return (0);
1059         }
1060         if (!execute_all(iface, doit, "post-down")) {
1061                 return (0);
1062         }
1063         return (1);
1064 }
1065
1066 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1067 static int popen2(FILE **in, FILE **out, char *command, ...)
1068 {
1069         va_list ap;
1070         char *argv[11] = { command };
1071         int argc;
1072         int infd[2], outfd[2];
1073         pid_t pid;
1074
1075         argc = 1;
1076         va_start(ap, command);
1077         while ((argc < 10) && (argv[argc] = va_arg(ap, char *))) {
1078                 argc++;
1079         }
1080         argv[argc] = NULL;      /* make sure */
1081         va_end(ap);
1082
1083         if (pipe(infd) != 0) {
1084                 return 0;
1085         }
1086
1087         if (pipe(outfd) != 0) {
1088                 close(infd[0]);
1089                 close(infd[1]);
1090                 return 0;
1091         }
1092
1093         fflush(NULL);
1094         switch (pid = fork()) {
1095         case -1:                        /* failure */
1096                 close(infd[0]);
1097                 close(infd[1]);
1098                 close(outfd[0]);
1099                 close(outfd[1]);
1100                 return 0;
1101         case 0:                 /* child */
1102                 dup2(infd[0], 0);
1103                 dup2(outfd[1], 1);
1104                 close(infd[0]);
1105                 close(infd[1]);
1106                 close(outfd[0]);
1107                 close(outfd[1]);
1108                 execvp(command, argv);
1109                 exit(127);
1110         default:                        /* parent */
1111                 *in = fdopen(infd[1], "w");
1112                 *out = fdopen(outfd[0], "r");
1113                 close(infd[0]);
1114                 close(outfd[1]);
1115                 return pid;
1116         }
1117         /* unreached */
1118 }
1119
1120 static int run_mapping(char *physical, char *logical, int len, mapping_defn_t * map)
1121 {
1122         FILE *in, *out;
1123         int i, status;
1124         pid_t pid;
1125
1126
1127         pid = popen2(&in, &out, map->script, physical, NULL);
1128         if (pid == 0) {
1129                 return 0;
1130         }
1131         for (i = 0; i < map->n_mappings; i++) {
1132                 fprintf(in, "%s\n", map->mapping[i]);
1133         }
1134         fclose(in);
1135         waitpid(pid, &status, 0);
1136         if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
1137                 if (fgets(logical, len, out)) {
1138                         char *pch = logical + xstrlen(logical) - 1;
1139
1140                         while (pch >= logical && isspace(*pch))
1141                                 *(pch--) = '\0';
1142                 }
1143         }
1144         fclose(out);
1145
1146         return 1;
1147 }
1148 #endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */
1149
1150 static llist_t *find_iface_state(llist_t *state_list, const char *iface)
1151 {
1152         unsigned short iface_len = xstrlen(iface);
1153         llist_t *search = state_list;
1154
1155         while (search) {
1156                 if ((strncmp(search->data, iface, iface_len) == 0) &&
1157                         (search->data[iface_len] == '=')) {
1158                         return(search);
1159                 }
1160                 search = search->link;
1161         }
1162         return(NULL);
1163 }
1164
1165 extern int ifupdown_main(int argc, char **argv)
1166 {
1167         int (*cmds) (interface_defn_t *) = NULL;
1168         interfaces_file_t *defn;
1169         FILE *state_fp = NULL;
1170         llist_t *state_list = NULL;
1171         llist_t *target_list = NULL;
1172         char *interfaces = "/etc/network/interfaces";
1173         const char *statefile = "/var/run/ifstate";
1174
1175 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1176         int run_mappings = 1;
1177 #endif
1178         int do_all = 0;
1179         int force = 0;
1180         int i;
1181
1182         if (applet_name[2] == 'u') {
1183                 /* ifup command */
1184                 cmds = iface_up;
1185         } else {
1186                 /* ifdown command */
1187                 cmds = iface_down;
1188         }
1189
1190 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1191         while ((i = getopt(argc, argv, "i:hvnamf")) != -1) {
1192 #else
1193         while ((i = getopt(argc, argv, "i:hvnaf")) != -1) {
1194 #endif
1195                 switch (i) {
1196                 case 'i':       /* interfaces */
1197                         interfaces = xstrdup(optarg);
1198                         break;
1199                 case 'v':       /* verbose */
1200                         verbose = 1;
1201                         break;
1202                 case 'a':       /* all */
1203                         do_all = 1;
1204                         break;
1205                 case 'n':       /* no-act */
1206                         no_act = 1;
1207                         break;
1208 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1209                 case 'm':       /* no-mappings */
1210                         run_mappings = 0;
1211                         break;
1212 #endif
1213                 case 'f':       /* force */
1214                         force = 1;
1215                         break;
1216                 default:
1217                         show_usage();
1218                         break;
1219                 }
1220         }
1221
1222         if (argc - optind > 0) {
1223                 if (do_all) {
1224                         show_usage();
1225                 }
1226         } else {
1227                 if (!do_all) {
1228                         show_usage();
1229                 }
1230         }
1231
1232         defn = read_interfaces(interfaces);
1233         if (!defn) {
1234                 error_msg_and_die("couldn't read interfaces file \"%s\"", interfaces);
1235         }
1236
1237         if (no_act) {
1238                 state_fp = fopen(statefile, "r");
1239         } else {
1240                 state_fp = xfopen(statefile, "a+");
1241         }
1242
1243         /* Read the previous state from the state file */
1244         if (state_fp != NULL) {
1245                 char *start;
1246                 while ((start = get_line_from_file(state_fp)) != NULL) {
1247                         char *end_ptr;
1248                         /* We should only need to check for a single character */
1249                         end_ptr = start + strcspn(start, " \t\n");
1250                         *end_ptr = '\0';
1251                         state_list = llist_add_to(state_list, start);
1252                 }
1253         }
1254
1255         /* Create a list of interfaces to work on */
1256         if (do_all) {
1257                 if (cmds == iface_up) {
1258                         target_list = defn->autointerfaces;
1259                 } else if (cmds == iface_down) {
1260                         const llist_t *list = state_list;
1261                         while (list) {
1262                                 target_list = llist_add_to(target_list, strdup(list->data));
1263                                 list = list->link;
1264                         }
1265                 }
1266         } else {
1267                 target_list = llist_add_to(target_list, argv[optind]);
1268         }
1269
1270
1271         /* Update the interfaces */
1272         while (target_list) {
1273                 interface_defn_t *currif;
1274                 char *iface;
1275                 char *liface;
1276                 char *pch;
1277                 int okay = 0;
1278
1279                 iface = strdup(target_list->data);
1280                 target_list = target_list->link;
1281
1282                 pch = strchr(iface, '=');
1283                 if (pch) {
1284                         *pch = '\0';
1285                         liface = strdup(pch + 1);
1286                 } else {
1287                         liface = strdup(iface);
1288                 }
1289
1290                 if (!force) {
1291                         const llist_t *iface_state = find_iface_state(state_list, iface);
1292
1293                         if (cmds == iface_up) {
1294                                 /* ifup */
1295                                 if (iface_state) {
1296                                         error_msg("interface %s already configured", iface);
1297                                         continue;
1298                                 }
1299                         } else {
1300                                 /* ifdown */
1301                                 if (iface_state == NULL) {
1302                                         error_msg("interface %s not configured", iface);
1303                                         continue;
1304                                 }
1305                                 pch = strchr(iface_state->data, '=');
1306                                 liface = strdup(pch + 1);
1307                         }
1308                 }
1309
1310 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1311                 if ((cmds == iface_up) && run_mappings) {
1312                         mapping_defn_t *currmap;
1313
1314                         for (currmap = defn->mappings; currmap; currmap = currmap->next) {
1315
1316                                 for (i = 0; i < currmap->n_matches; i++) {
1317                                         if (fnmatch(currmap->match[i], liface, 0) != 0)
1318                                                 continue;
1319                                         if (verbose) {
1320                                                 error_msg("Running mapping script %s on %s", currmap->script, liface);
1321                                         }
1322                                         run_mapping(iface, liface, sizeof(liface), currmap);
1323                                         break;
1324                                 }
1325                         }
1326                 }
1327 #endif
1328
1329                 for (currif = defn->ifaces; currif; currif = currif->next) {
1330                         if (strcmp(liface, currif->iface) == 0) {
1331                                 char *oldiface = currif->iface;
1332
1333                                 okay = 1;
1334                                 currif->iface = iface;
1335
1336                                 if (verbose) {
1337                                         error_msg("Configuring interface %s=%s (%s)", iface, liface, currif->address_family->name);
1338                                 }
1339
1340                                 /* Call the cmds function pointer, does either iface_up() or iface_down() */
1341                                 if (cmds(currif) == -1) {
1342                                         printf
1343                                                 ("Don't seem to be have all the variables for %s/%s.\n",
1344                                                  liface, currif->address_family->name);
1345                                 }
1346
1347                                 currif->iface = oldiface;
1348                         }
1349                 }
1350
1351                 if (!okay && !force) {
1352                         error_msg("Ignoring unknown interface %s=%s.", iface, liface);
1353                 } else {
1354                         llist_t *iface_state = find_iface_state(state_list, iface);
1355
1356                         if (cmds == iface_up) {
1357                                 char *newiface = xmalloc(xstrlen(iface) + 1 + xstrlen(liface) + 1);
1358                                 sprintf(newiface, "%s=%s", iface, liface);
1359                                 if (iface_state == NULL) {
1360                                         state_list = llist_add_to(state_list, newiface);
1361                                 } else {
1362                                         free(iface_state->data);
1363                                         iface_state->data = newiface;
1364                                 }
1365                         } else if (cmds == iface_down) {
1366                                 /* Remove an interface from the linked list */
1367                                 if (iface_state) {
1368                                         /* This needs to be done better */
1369                                         free(iface_state->data);
1370                                         free(iface_state->link);
1371                                         if (iface_state->link) {
1372                                                 iface_state->data = iface_state->link->data;
1373                                                 iface_state->link = iface_state->link->link;
1374                                         } else {
1375                                                 iface_state->data = NULL;
1376                                                 iface_state->link = NULL;
1377                                         }
1378                                 }
1379                         }
1380                 }
1381         }
1382
1383         /* Actually write the new state */
1384         if (state_fp != NULL && !no_act) {
1385                 if (ftruncate(fileno(state_fp), 0) < 0) {
1386                         error_msg_and_die("failed to truncate statefile %s: %s", statefile, strerror(errno));
1387                 }
1388
1389                 rewind(state_fp);
1390
1391                 while (state_list) {
1392                         if (state_list->data) {
1393                                 fputs(state_list->data, state_fp);
1394                                 fputc('\n', state_fp);
1395                         }
1396                         state_list = state_list->link;
1397                 }
1398                 fflush(state_fp);
1399         }
1400
1401         /* Cleanup */
1402         if (state_fp != NULL) {
1403                 fclose(state_fp);
1404                 state_fp = NULL;
1405         }
1406
1407         return 0;
1408 }