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         if (!execute("ifconfig %iface% add ::1", ifd, exec)) {
 311                 return(0);
 312         }
 313         return(1);
 314 }
 315
 316 static int loopback_down6(interface_defn_t *ifd, execfn *exec)
 317 {
 318         if (!execute("ifconfig %iface% del ::1", ifd, exec)) {
 319                 return(0);
 320         }
 321         return(1);
 322 }
 323
 324 static int static_up6(interface_defn_t *ifd, execfn *exec)
 325 {
 326         if (!execute("ifconfig %iface% [[media %media%]] [[hw %hwaddress%]] [[mtu %mtu%]] up", ifd, exec)) {
 327                 return(0);
 328         }
 329         if (!execute("ifconfig %iface% add %address%/%netmask%", ifd, exec)) {
 330                 return(0);
 331         }
 332         if (!execute("[[ route -A inet6 add ::/0 gw %gateway% ]]", ifd, exec)) {
 333                 return(0);
 334         }
 335         return(1);
 336 }
 337
 338 static int static_down6(interface_defn_t *ifd, execfn *exec)
 339 {
 340         if (!execute("ifconfig %iface% down", ifd, exec)) {
 341                 return(0);
 342         }
 343         return(1);
 344 }
 345
 346 static int v4tunnel_up(interface_defn_t *ifd, execfn *exec)
 347 {
 348         if (!execute("ip tunnel add %iface% mode sit remote %endpoint% [[local %local%]] [[ttl %ttl%]]", ifd, exec)) {
 349                 return(0);
 350         }
 351         if (!execute("ip link set %iface% up", ifd, exec)) {
 352                 return(0);
 353         }
 354         if (!execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec)) {
 355                 return(0);
 356         }
 357         if (!execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec)) {
 358                 return(0);
 359         }
 360         return(1);
 361 }
 362
 363 static int v4tunnel_down(interface_defn_t * ifd, execfn * exec)
 364 {
 365         if (!execute("ip tunnel del %iface%", ifd, exec)) {
 366                 return(0);
 367         }
 368         return(1);
 369 }
 370
 371 static method_t methods6[] = {
 372         { "v4tunnel", v4tunnel_up, v4tunnel_down, },
 373         { "static", static_up6, static_down6, },
 374         { "loopback", loopback_up6, loopback_down6, },
 375 };
 376
 377 address_family_t addr_inet6 = {
 378         "inet6",
 379         sizeof(methods6) / sizeof(method_t),
 380         methods6
 381 };
 382 #endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */
 383
 384 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
 385 static int loopback_up(interface_defn_t *ifd, execfn *exec)
 386 {
 387         if (!execute("ifconfig %iface% 127.0.0.1 up", ifd, exec)) {
 388                 return(0);
 389         }
 390         return(1);
 391 }
 392
 393 static int loopback_down(interface_defn_t *ifd, execfn *exec)
 394 {
 395         if (!execute("ifconfig %iface% 127.0.0.1 down", ifd, exec)) {
 396                 return(0);
 397         }
 398         return(1);
 399 }
 400
 401 static int static_up(interface_defn_t *ifd, execfn *exec)
 402 {
 403         if (!execute("ifconfig %iface% %address% netmask %netmask% [[broadcast %broadcast%]]    [[pointopoint %pointopoint%]] [[media %media%]] [[mtu %mtu%]]   [[hw %hwaddress%]] up",
 404                  ifd, exec)) {
 405                 return(0);
 406         }
 407         if (!execute("[[ route add default gw %gateway% %iface% ]]", ifd, exec)) {
 408                 return(0);
 409         }
 410         return(1);
 411 }
 412
 413 static int static_down(interface_defn_t *ifd, execfn *exec)
 414 {
 415         if (!execute("[[ route del default gw %gateway% %iface% ]]", ifd, exec)) {
 416                 return(0);
 417         }
 418         if (!execute("ifconfig %iface% down", ifd, exec)) {
 419                 return(0);
 420         }
 421         return(1);
 422 }
 423
 424 static int execable(char *program)
 425 {
 426         struct stat buf;
 427         if (0 == stat(program, &buf)) {
 428                 if (S_ISREG(buf.st_mode) && (S_IXUSR & buf.st_mode)) {
 429                         return(1);
 430                 }
 431         }
 432         return(0);
 433 }
 434
 435 static int dhcp_up(interface_defn_t *ifd, execfn *exec)
 436 {
 437         if (execable("/sbin/dhclient")) {
 438                 if (!execute("dhclient -pf /var/run/dhclient.%iface%.pid %iface%", ifd, exec)) {
 439                         return(0);
 440                 }
 441         } else if (execable("/sbin/pump")) {
 442                 if (!execute("pump -i %iface% [[-h %hostname%]] [[-l %leasehours%]]", ifd, exec)) {
 443                         return(0);
 444                 }
 445         } else if (execable("/sbin/udhcpc")) {
 446                 if (!execute("udhcpc -n -p /var/run/udhcpc.%iface%.pid -i %iface% [[-H %hostname%]] [[-c %clientid%]]", ifd, exec)) {
 447                         return 0;
 448                 }
 449         } else if (execable("/sbin/dhcpcd")) {
 450                 if (!execute("dhcpcd [[-h %hostname%]] [[-i %vendor%]] [[-I %clientid%]] [[-l %leasetime%]] %iface%", ifd, exec)) {
 451                         return(0);
 452                 }
 453         }
 454         return(1);
 455 }
 456
 457 static int dhcp_down(interface_defn_t *ifd, execfn *exec)
 458 {
 459         if (execable("/sbin/dhclient")) {
 460                 if (!execute("kill -9 `cat /var/run/udhcpc.%iface%.pid`", ifd, exec)) {
 461                         return(0);
 462                 }
 463         } else if (execable("/sbin/pump")) {
 464                 if (!execute("pump -i %iface% -k", ifd, exec)) {
 465                         return(0);
 466                 }
 467         } else if (execable("/sbin/udhcpc")) {
 468                 if (!execute("kill -9 `cat /var/run/udhcpc.%iface%.pid`", ifd, exec)) {
 469                         return(0);
 470                 }
 471         } else if (execable("/sbin/dhcpcd")) {
 472                 if (!execute("dhcpcd -k %iface%", ifd, exec)) {
 473                         return(0);
 474                 }
 475         }
 476         if (!execute("ifconfig %iface% down", ifd, exec)) {
 477                 return(0);
 478         }
 479         return(1);
 480 }
 481
 482 static int bootp_up(interface_defn_t *ifd, execfn *exec)
 483 {
 484         if (!execute("bootpc [[--bootfile %bootfile%]] --dev %iface% [[--server %server%]]            [[--hwaddr %hwaddr%]] --returniffail --serverbcast", ifd, exec)) {
 485                 return 0;
 486         }
 487         return 1;
 488 }
 489
 490 static int bootp_down(interface_defn_t *ifd, execfn *exec)
 491 {
 492         if (!execute("ifconfig down %iface%", ifd, exec)) {
 493                 return 0;
 494         }
 495         return 1;
 496 }
 497
 498 static int ppp_up(interface_defn_t *ifd, execfn *exec)
 499 {
 500         if (!execute("pon [[%provider%]]", ifd, exec)) {
 501                 return 0;
 502         }
 503         return 1;
 504 }
 505
 506 static int ppp_down(interface_defn_t *ifd, execfn *exec)
 507 {
 508         if (!execute("poff [[%provider%]]", ifd, exec)) {
 509                 return 0;
 510         }
 511         return 1;
 512 }
 513
 514 static int wvdial_up(interface_defn_t *ifd, execfn *exec)
 515 {
 516         if (!execute("/sbin/start-stop-daemon --start -x /usr/bin/wvdial -p /var/run/wvdial.%iface% -b -m -- [[ %provider% ]]", ifd, exec)) {
 517                 return 0;
 518         }
 519         return 1;
 520 }
 521
 522 static int wvdial_down(interface_defn_t *ifd, execfn *exec)
 523 {
 524         if (!execute ("/sbin/start-stop-daemon --stop -x /usr/bin/wvdial -p /var/run/wvdial.%iface% -s 2", ifd, exec)) {
 525                 return 0;
 526         }
 527         return 1;
 528 }
 529
 530 static method_t methods[] = {
 531         { "wvdial", wvdial_up, wvdial_down, },
 532         { "ppp", ppp_up, ppp_down, },
 533         { "static", static_up, static_down, },
 534         { "bootp", bootp_up, bootp_down, },
 535         { "dhcp", dhcp_up, dhcp_down, },
 536         { "loopback", loopback_up, loopback_down, },
 537 };
 538
 539 address_family_t addr_inet = {
 540         "inet",
 541         sizeof(methods) / sizeof(method_t),
 542         methods
 543 };
 544
 545 #endif  /* ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 */
 546
 547 static char *next_word(char *buf, char *word, int maxlen)
 548 {
 549         if (!buf)
 550                 return NULL;
 551         if (!*buf)
 552                 return NULL;
 553
 554         while (!isspace(*buf) && *buf) {
 555                 if (maxlen-- > 1)
 556                         *word++ = *buf;
 557                 buf++;
 558         }
 559         if (maxlen > 0) {
 560                 *word = '\0';
 561         }
 562
 563         while (isspace(*buf) && *buf) {
 564                 buf++;
 565         }
 566
 567         return buf;
 568 }
 569
 570 static address_family_t *get_address_family(address_family_t *af[], char *name)
 571 {
 572         int i;
 573
 574         for (i = 0; af[i]; i++) {
 575                 if (strcmp(af[i]->name, name) == 0) {
 576                         return af[i];
 577                 }
 578         }
 579         return NULL;
 580 }
 581
 582 static method_t *get_method(address_family_t *af, char *name)
 583 {
 584         int i;
 585
 586         for (i = 0; i < af->n_methods; i++) {
 587                 if (strcmp(af->method[i].name, name) == 0) {
 588                         return &af->method[i];
 589                 }
 590         }
 591         return(NULL);
 592 }
 593
 594 static int duplicate_if(interface_defn_t *ifa, interface_defn_t *ifb)
 595 {
 596         if (strcmp(ifa->iface, ifb->iface) != 0) {
 597                 return(0);
 598         }
 599         if (ifa->address_family != ifb->address_family) {
 600                 return(0);
 601         }
 602         return(1);
 603 }
 604
 605 static const llist_t *find_list_string(const llist_t *list, const char *string)
 606 {
 607         while (list) {
 608                 if (strcmp(list->data, string) == 0) {
 609                         return(list);
 610                 }
 611                 list = list->link;
 612         }
 613         return(NULL);
 614 }
 615
 616 static interfaces_file_t *read_interfaces(char *filename)
 617 {
 618         interface_defn_t *currif = NULL;
 619         interfaces_file_t *defn;
 620 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 621         mapping_defn_t *currmap = NULL;
 622 #endif
 623         FILE *f;
 624         char firstword[80];
 625         char *buf = NULL;
 626         char *rest;
 627 //      int line;
 628
 629         enum { NONE, IFACE, MAPPING } currently_processing = NONE;
 630
 631         defn = xmalloc(sizeof(interfaces_file_t));
 632 //      defn->max_autointerfaces = defn->n_autointerfaces = 0;
 633         defn->autointerfaces = NULL;
 634         defn->mappings = NULL;
 635         defn->ifaces = NULL;
 636         f = fopen(filename, "r");
 637         if (f == NULL) {
 638                 return NULL;
 639         }
 640
 641         while ((buf = get_line_from_file(f)) != NULL) {
 642                 char *end;
 643
 644                 if (buf[0] == '#') {
 645                         continue;
 646                 }
 647                 end = last_char_is(buf, '\n');
 648                 if (end) {
 649                         *end = '\0';
 650                 }
 651                 while ((end = last_char_is(buf, ' ')) != NULL) {
 652                         *end = '\0';
 653                 }
 654                 rest = next_word(buf, firstword, 80);
 655                 if (rest == NULL) {
 656                         continue;       /* blank line */
 657                 }
 658
 659                 if (strcmp(firstword, "mapping") == 0) {
 660 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 661                         currmap = xmalloc(sizeof(mapping_defn_t));
 662                         currmap->max_matches = 0;
 663                         currmap->n_matches = 0;
 664                         currmap->match = NULL;
 665
 666                         while ((rest = next_word(rest, firstword, 80))) {
 667                                 if (currmap->max_matches == currmap->n_matches) {
 668                                         currmap->max_matches = currmap->max_matches * 2 + 1;
 669                                         currmap->match = xrealloc(currmap->match, sizeof(currmap->match) * currmap->max_matches);
 670                                 }
 671
 672                                 currmap->match[currmap->n_matches++] = xstrdup(firstword);
 673                         }
 674                         currmap->max_mappings = 0;
 675                         currmap->n_mappings = 0;
 676                         currmap->mapping = NULL;
 677                         currmap->script = NULL;
 678                         {
 679                                 mapping_defn_t **where = &defn->mappings;
 680                                 while (*where != NULL) {
 681                                         where = &(*where)->next;
 682                                 }
 683                                 *where = currmap;
 684                                 currmap->next = NULL;
 685                         }
 686 #endif
 687                         currently_processing = MAPPING;
 688                 } else if (strcmp(firstword, "iface") == 0) {
 689                         {
 690                                 char iface_name[80];
 691                                 char address_family_name[80];
 692                                 char method_name[80];
 693                                 address_family_t *addr_fams[] = {
 694 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
 695                                         &addr_inet,
 696 #endif
 697 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
 698                                         &addr_inet6,
 699 #endif
 700 #ifdef CONFIG_FEATURE_IFUPDOWN_IPX
 701                                         &addr_ipx,
 702 #endif
 703                                         NULL
 704                                 };
 705
 706                                 currif = xmalloc(sizeof(interface_defn_t));
 707
 708                                 rest = next_word(rest, iface_name, 80);
 709                                 rest = next_word(rest, address_family_name, 80);
 710                                 rest = next_word(rest, method_name, 80);
 711
 712                                 if (rest == NULL) {
 713                                         error_msg("too few parameters for line \"%s\"", buf);
 714                                         return NULL;
 715                                 }
 716
 717                                 if (rest[0] != '\0') {
 718                                         error_msg("too many parameters \"%s\"", buf);
 719                                         return NULL;
 720                                 }
 721
 722                                 currif->iface = xstrdup(iface_name);
 723
 724                                 currif->address_family = get_address_family(addr_fams, address_family_name);
 725                                 if (!currif->address_family) {
 726                                         error_msg("unknown address type \"%s\"", buf);
 727                                         return NULL;
 728                                 }
 729
 730                                 currif->method = get_method(currif->address_family, method_name);
 731                                 if (!currif->method) {
 732                                         error_msg("unknown method \"%s\"", buf);
 733                                         return NULL;
 734                                 }
 735
 736                                 currif->automatic = 1;
 737                                 currif->max_options = 0;
 738                                 currif->n_options = 0;
 739                                 currif->option = NULL;
 740
 741
 742                                 {
 743                                         interface_defn_t **where = &defn->ifaces;
 744
 745                                         while (*where != NULL) {
 746                                                 if (duplicate_if(*where, currif)) {
 747                                                         error_msg("duplicate interface \"%s\"", buf);
 748                                                         return NULL;
 749                                                 }
 750                                                 where = &(*where)->next;
 751                                         }
 752
 753                                         *where = currif;
 754                                         currif->next = NULL;
 755                                 }
 756                         }
 757                         currently_processing = IFACE;
 758                 } else if (strcmp(firstword, "auto") == 0) {
 759                         while ((rest = next_word(rest, firstword, 80))) {
 760
 761                                 /* Check the interface isnt already listed */
 762                                 if (find_list_string(defn->autointerfaces, firstword)) {
 763                                         perror_msg_and_die("interface declared auto twice \"%s\"", buf);
 764                                 }
 765
 766                                 /* Add the interface to the list */
 767                                 defn->autointerfaces = llist_add_to(defn->autointerfaces, strdup(firstword));
 768                         }
 769                         currently_processing = NONE;
 770                 } else {
 771                         switch (currently_processing) {
 772                         case IFACE:
 773                         {
 774                                 int i;
 775
 776                                 if (xstrlen(rest) == 0) {
 777                                         error_msg("option with empty value \"%s\"", buf);
 778                                         return NULL;
 779                                 }
 780
 781                                 if (strcmp(firstword, "up") != 0
 782                                         && strcmp(firstword, "down") != 0
 783                                         && strcmp(firstword, "pre-up") != 0
 784                                         && strcmp(firstword, "post-down") != 0) {
 785                                         for (i = 0; i < currif->n_options; i++) {
 786                                                 if (strcmp(currif->option[i].name, firstword) == 0) {
 787                                                         error_msg("duplicate option \"%s\"", buf);
 788                                                         return NULL;
 789                                                 }
 790                                         }
 791                                 }
 792                         }
 793                                 if (currif->n_options >= currif->max_options) {
 794                                         variable_t *opt;
 795
 796                                         currif->max_options = currif->max_options + 10;
 797                                         opt = xrealloc(currif->option, sizeof(*opt) * currif->max_options);
 798                                         currif->option = opt;
 799                                 }
 800                                 currif->option[currif->n_options].name = xstrdup(firstword);
 801                                 currif->option[currif->n_options].value = xstrdup(rest);
 802                                 if (!currif->option[currif->n_options].name) {
 803                                         perror(filename);
 804                                         return NULL;
 805                                 }
 806                                 if (!currif->option[currif->n_options].value) {
 807                                         perror(filename);
 808                                         return NULL;
 809                                 }
 810                                 currif->n_options++;
 811                                 break;
 812                         case MAPPING:
 813 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 814                                 if (strcmp(firstword, "script") == 0) {
 815                                         if (currmap->script != NULL) {
 816                                                 error_msg("duplicate script in mapping \"%s\"", buf);
 817                                                 return NULL;
 818                                         } else {
 819                                                 currmap->script = xstrdup(rest);
 820                                         }
 821                                 } else if (strcmp(firstword, "map") == 0) {
 822                                         if (currmap->max_mappings == currmap->n_mappings) {
 823                                                 currmap->max_mappings = currmap->max_mappings * 2 + 1;
 824                                                 currmap->mapping = xrealloc(currmap->mapping, sizeof(char *) * currmap->max_mappings);
 825                                         }
 826                                         currmap->mapping[currmap->n_mappings] = xstrdup(rest);
 827                                         currmap->n_mappings++;
 828                                 } else {
 829                                         error_msg("misplaced option \"%s\"", buf);
 830                                         return NULL;
 831                                 }
 832 #endif
 833                                 break;
 834                         case NONE:
 835                         default:
 836                                 error_msg("misplaced option \"%s\"", buf);
 837                                 return NULL;
 838                         }
 839                 }
 840         }
 841         if (ferror(f) != 0) {
 842                 perror_msg("%s", filename);
 843                 return NULL;
 844         }
 845         fclose(f);
 846
 847         return defn;
 848 }
 849
 850 static int check(char *str)
 851 {
 852         return (str != NULL);
 853 }
 854
 855 static char *setlocalenv(char *format, char *name, char *value)
 856 {
 857         char *result;
 858         char *here;
 859         char *there;
 860
 861         result = xmalloc(xstrlen(format) + xstrlen(name) + xstrlen(value) + 1);
 862
 863         sprintf(result, format, name, value);
 864
 865         for (here = there = result; *there != '=' && *there; there++) {
 866                 if (*there == '-')
 867                         *there = '_';
 868                 if (isalpha(*there))
 869                         *there = toupper(*there);
 870
 871                 if (isalnum(*there) || *there == '_') {
 872                         *here = *there;
 873                         here++;
 874                 }
 875         }
 876         memmove(here, there, xstrlen(there) + 1);
 877
 878         return result;
 879 }
 880
 881 static void set_environ(interface_defn_t *iface, char *mode)
 882 {
 883         char **environend;
 884         int i;
 885         const int n_env_entries = iface->n_options + 5;
 886         char **ppch;
 887
 888         if (environ != NULL) {
 889                 for (ppch = environ; *ppch; ppch++) {
 890                         free(*ppch);
 891                         *ppch = NULL;
 892                 }
 893                 free(environ);
 894                 environ = NULL;
 895         }
 896         environ = xmalloc(sizeof(char *) * (n_env_entries + 1 /* for final NULL */ ));
 897         environend = environ;
 898         *environend = NULL;
 899
 900         for (i = 0; i < iface->n_options; i++) {
 901                 if (strcmp(iface->option[i].name, "up") == 0
 902                         || strcmp(iface->option[i].name, "down") == 0
 903                         || strcmp(iface->option[i].name, "pre-up") == 0
 904                         || strcmp(iface->option[i].name, "post-down") == 0) {
 905                         continue;
 906                 }
 907                 *(environend++) = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value);
 908                 *environend = NULL;
 909         }
 910
 911         *(environend++) = setlocalenv("%s=%s", "IFACE", iface->iface);
 912         *environend = NULL;
 913         *(environend++) = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name);
 914         *environend = NULL;
 915         *(environend++) = setlocalenv("%s=%s", "METHOD", iface->method->name);
 916         *environend = NULL;
 917         *(environend++) = setlocalenv("%s=%s", "MODE", mode);
 918         *environend = NULL;
 919         *(environend++) = setlocalenv("%s=%s", "PATH", "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin");
 920         *environend = NULL;
 921 }
 922
 923 static int doit(char *str)
 924 {
 925         if (verbose || no_act) {
 926                 error_msg("%s", str);
 927         }
 928         if (!no_act) {
 929                 pid_t child;
 930                 int status;
 931
 932                 fflush(NULL);
 933                 switch (child = fork()) {
 934                 case -1:                /* failure */
 935                         return 0;
 936                 case 0:         /* child */
 937                         execle("/bin/sh", "/bin/sh", "-c", str, NULL, environ);
 938                         exit(127);
 939                 default:                /* parent */
 940                 }
 941                 waitpid(child, &status, 0);
 942                 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
 943                         return 0;
 944                 }
 945         }
 946         return (1);
 947 }
 948
 949 static int execute_all(interface_defn_t *ifd, execfn *exec, const char *opt)
 950 {
 951         int i;
 952         char *buf;
 953
 954         for (i = 0; i < ifd->n_options; i++) {
 955                 if (strcmp(ifd->option[i].name, opt) == 0) {
 956                         if (!(*exec) (ifd->option[i].value)) {
 957                                 return 0;
 958                         }
 959                 }
 960         }
 961
 962         buf = xmalloc(xstrlen(opt) + 19);
 963         sprintf(buf, "/etc/network/if-%s.d", opt);
 964         run_parts(&buf, 0);
 965         free(buf);
 966         return (1);
 967 }
 968
 969 static int iface_up(interface_defn_t *iface)
 970 {
 971         if (!iface->method->up(iface, check)) {
 972                 return (-1);
 973         }
 974
 975         set_environ(iface, "start");
 976         if (!execute_all(iface, doit, "pre-up")) {
 977                 return (0);
 978         }
 979         if (!iface->method->up(iface, doit)) {
 980                 return (0);
 981         }
 982         if (!execute_all(iface, doit, "up")) {
 983                 return (0);
 984         }
 985
 986         return (1);
 987 }
 988
 989 static int iface_down(interface_defn_t *iface)
 990 {
 991         if (!iface->method->down(iface, check)) {
 992                 return (-1);
 993         }
 994         set_environ(iface, "stop");
 995         if (!execute_all(iface, doit, "down")) {
 996                 return (0);
 997         }
 998         if (!iface->method->down(iface, doit)) {
 999                 return (0);
1000         }
1001         if (!execute_all(iface, doit, "post-down")) {
1002                 return (0);
1003         }
1004         return (1);
1005 }
1006
1007 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1008 static int popen2(FILE **in, FILE **out, char *command, ...)
1009 {
1010         va_list ap;
1011         char *argv[11] = { command };
1012         int argc;
1013         int infd[2], outfd[2];
1014         pid_t pid;
1015
1016         argc = 1;
1017         va_start(ap, command);
1018         while ((argc < 10) && (argv[argc] = va_arg(ap, char *))) {
1019                 argc++;
1020         }
1021         argv[argc] = NULL;      /* make sure */
1022         va_end(ap);
1023
1024         if (pipe(infd) != 0) {
1025                 return 0;
1026         }
1027
1028         if (pipe(outfd) != 0) {
1029                 close(infd[0]);
1030                 close(infd[1]);
1031                 return 0;
1032         }
1033
1034         fflush(NULL);
1035         switch (pid = fork()) {
1036         case -1:                        /* failure */
1037                 close(infd[0]);
1038                 close(infd[1]);
1039                 close(outfd[0]);
1040                 close(outfd[1]);
1041                 return 0;
1042         case 0:                 /* child */
1043                 dup2(infd[0], 0);
1044                 dup2(outfd[1], 1);
1045                 close(infd[0]);
1046                 close(infd[1]);
1047                 close(outfd[0]);
1048                 close(outfd[1]);
1049                 execvp(command, argv);
1050                 exit(127);
1051         default:                        /* parent */
1052                 *in = fdopen(infd[1], "w");
1053                 *out = fdopen(outfd[0], "r");
1054                 close(infd[0]);
1055                 close(outfd[1]);
1056                 return pid;
1057         }
1058         /* unreached */
1059 }
1060
1061 static int run_mapping(char *physical, char *logical, int len, mapping_defn_t * map)
1062 {
1063         FILE *in, *out;
1064         int i, status;
1065         pid_t pid;
1066
1067
1068         pid = popen2(&in, &out, map->script, physical, NULL);
1069         if (pid == 0) {
1070                 return 0;
1071         }
1072         for (i = 0; i < map->n_mappings; i++) {
1073                 fprintf(in, "%s\n", map->mapping[i]);
1074         }
1075         fclose(in);
1076         waitpid(pid, &status, 0);
1077         if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
1078                 if (fgets(logical, len, out)) {
1079                         char *pch = logical + xstrlen(logical) - 1;
1080
1081                         while (pch >= logical && isspace(*pch))
1082                                 *(pch--) = '\0';
1083                 }
1084         }
1085         fclose(out);
1086
1087         return 1;
1088 }
1089 #endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */
1090
1091 static llist_t *find_iface_state(llist_t *state_list, const char *iface)
1092 {
1093         unsigned short iface_len = xstrlen(iface);
1094         llist_t *search = state_list;
1095
1096         while (search) {
1097                 if ((strncmp(search->data, iface, iface_len) == 0) &&
1098                         (search->data[iface_len] == '=')) {
1099                         return(search);
1100                 }
1101                 search = search->link;
1102         }
1103         return(NULL);
1104 }
1105
1106 extern int ifupdown_main(int argc, char **argv)
1107 {
1108         int (*cmds) (interface_defn_t *) = NULL;
1109         interfaces_file_t *defn;
1110         FILE *state_fp = NULL;
1111         llist_t *state_list = NULL;
1112         llist_t *target_list = NULL;
1113         char *interfaces = "/etc/network/interfaces";
1114         const char *statefile = "/var/run/ifstate";
1115
1116 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1117         int run_mappings = 1;
1118 #endif
1119         int do_all = 0;
1120         int force = 0;
1121         int i;
1122
1123         if (applet_name[2] == 'u') {
1124                 /* ifup command */
1125                 cmds = iface_up;
1126         } else {
1127                 /* ifdown command */
1128                 cmds = iface_down;
1129         }
1130
1131 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1132         while ((i = getopt(argc, argv, "i:hvnamf")) != -1) {
1133 #else
1134         while ((i = getopt(argc, argv, "i:hvnaf")) != -1) {
1135 #endif
1136                 switch (i) {
1137                 case 'i':       /* interfaces */
1138                         interfaces = xstrdup(optarg);
1139                         break;
1140                 case 'v':       /* verbose */
1141                         verbose = 1;
1142                         break;
1143                 case 'a':       /* all */
1144                         do_all = 1;
1145                         break;
1146                 case 'n':       /* no-act */
1147                         no_act = 1;
1148                         break;
1149 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1150                 case 'm':       /* no-mappings */
1151                         run_mappings = 0;
1152                         break;
1153 #endif
1154                 case 'f':       /* force */
1155                         force = 1;
1156                         break;
1157                 default:
1158                         show_usage();
1159                         break;
1160                 }
1161         }
1162
1163         if (argc - optind > 0) {
1164                 if (do_all) {
1165                         show_usage();
1166                 }
1167         } else {
1168                 if (!do_all) {
1169                         show_usage();
1170                 }
1171         }
1172
1173         defn = read_interfaces(interfaces);
1174         if (!defn) {
1175                 error_msg_and_die("couldn't read interfaces file \"%s\"", interfaces);
1176         }
1177
1178         if (no_act) {
1179                 state_fp = fopen(statefile, "r");
1180         } else {
1181                 state_fp = xfopen(statefile, "a+");
1182         }
1183
1184         /* Read the previous state from the state file */
1185         if (state_fp != NULL) {
1186                 char *start;
1187                 while ((start = get_line_from_file(state_fp)) != NULL) {
1188                         char *end_ptr;
1189                         /* We should only need to check for a single character */
1190                         end_ptr = start + strcspn(start, " \t\n");
1191                         *end_ptr = '\0';
1192                         state_list = llist_add_to(state_list, start);
1193                 }
1194         }
1195
1196         /* Create a list of interfaces to work on */
1197         if (do_all) {
1198                 if (cmds == iface_up) {
1199                         target_list = defn->autointerfaces;
1200                 } else if (cmds == iface_down) {
1201                         const llist_t *list = state_list;
1202                         while (list) {
1203                                 target_list = llist_add_to(target_list, strdup(list->data));
1204                                 list = list->link;
1205                         }
1206                 }
1207         } else {
1208                 target_list = llist_add_to(target_list, argv[optind]);
1209         }
1210
1211
1212         /* Update the interfaces */
1213         while (target_list) {
1214                 interface_defn_t *currif;
1215                 char *iface;
1216                 char *liface;
1217                 char *pch;
1218                 int okay = 0;
1219
1220                 iface = strdup(target_list->data);
1221                 target_list = target_list->link;
1222
1223                 pch = strchr(iface, '=');
1224                 if (pch) {
1225                         *pch = '\0';
1226                         liface = strdup(pch + 1);
1227                 } else {
1228                         liface = strdup(iface);
1229                 }
1230
1231                 if (!force) {
1232                         const llist_t *iface_state = find_iface_state(state_list, iface);
1233
1234                         if (cmds == iface_up) {
1235                                 /* ifup */
1236                                 if (iface_state) {
1237                                         error_msg("interface %s already configured", iface);
1238                                         continue;
1239                                 }
1240                         } else {
1241                                 /* ifdown */
1242                                 if (iface_state == NULL) {
1243                                         error_msg("interface %s not configured", iface);
1244                                         continue;
1245                                 }
1246                                 pch = strchr(iface_state->data, '=');
1247                                 liface = strdup(pch + 1);
1248                         }
1249                 }
1250
1251 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1252                 if ((cmds == iface_up) && run_mappings) {
1253                         mapping_defn_t *currmap;
1254
1255                         for (currmap = defn->mappings; currmap; currmap = currmap->next) {
1256
1257                                 for (i = 0; i < currmap->n_matches; i++) {
1258                                         if (fnmatch(currmap->match[i], liface, 0) != 0)
1259                                                 continue;
1260                                         if (verbose) {
1261                                                 error_msg("Running mapping script %s on %s", currmap->script, liface);
1262                                         }
1263                                         run_mapping(iface, liface, sizeof(liface), currmap);
1264                                         break;
1265                                 }
1266                         }
1267                 }
1268 #endif
1269
1270                 for (currif = defn->ifaces; currif; currif = currif->next) {
1271                         if (strcmp(liface, currif->iface) == 0) {
1272                                 char *oldiface = currif->iface;
1273
1274                                 okay = 1;
1275                                 currif->iface = iface;
1276
1277                                 if (verbose) {
1278                                         error_msg("Configuring interface %s=%s (%s)", iface, liface, currif->address_family->name);
1279                                 }
1280
1281                                 /* Call the cmds function pointer, does either iface_up() or iface_down() */
1282                                 if (cmds(currif) == -1) {
1283                                         printf
1284                                                 ("Don't seem to be have all the variables for %s/%s.\n",
1285                                                  liface, currif->address_family->name);
1286                                 }
1287
1288                                 currif->iface = oldiface;
1289                         }
1290                 }
1291
1292                 if (!okay && !force) {
1293                         error_msg("Ignoring unknown interface %s=%s.", iface, liface);
1294                 } else {
1295                         llist_t *iface_state = find_iface_state(state_list, iface);
1296
1297                         if (cmds == iface_up) {
1298                                 char *newiface = xmalloc(xstrlen(iface) + 1 + xstrlen(liface) + 1);
1299                                 sprintf(newiface, "%s=%s", iface, liface);
1300                                 if (iface_state == NULL) {
1301                                         state_list = llist_add_to(state_list, newiface);
1302                                 } else {
1303                                         free(iface_state->data);
1304                                         iface_state->data = newiface;
1305                                 }
1306                         } else if (cmds == iface_down) {
1307                                 /* Remove an interface from the linked list */
1308                                 if (iface_state) {
1309                                         /* This needs to be done better */
1310                                         free(iface_state->data);
1311                                         free(iface_state->link);
1312                                         if (iface_state->link) {
1313                                                 iface_state->data = iface_state->link->data;
1314                                                 iface_state->link = iface_state->link->link;
1315                                         } else {
1316                                                 iface_state->data = NULL;
1317                                                 iface_state->link = NULL;
1318                                         }
1319                                 }
1320                         }
1321                 }
1322         }
1323
1324         /* Actually write the new state */
1325         if (state_fp != NULL && !no_act) {
1326                 if (ftruncate(fileno(state_fp), 0) < 0) {
1327                         error_msg_and_die("failed to truncate statefile %s: %s", statefile, strerror(errno));
1328                 }
1329
1330                 rewind(state_fp);
1331
1332                 while (state_list) {
1333                         if (state_list->data) {
1334                                 fputs(state_list->data, state_fp);
1335                                 fputc('\n', state_fp);
1336                         }
1337                         state_list = state_list->link;
1338                 }
1339                 fflush(state_fp);
1340         }
1341
1342         /* Cleanup */
1343         if (state_fp != NULL) {
1344                 fclose(state_fp);
1345                 state_fp = NULL;
1346         }
1347
1348         return 0;
1349 }