networking/ifupdown.c

   1 /*
   2  *  ifupdown for busybox
   3  *  Based on ifupdown by Anthony Towns
   4  *  Copyright (c) 1999 Anthony Towns <aj@azure.humbug.org.au>
   5  *
   6  *  Remove checks for kernel version, assume kernel version 2.2.0 or better
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  21  */
  22
  23 #include <sys/stat.h>
  24 #include <sys/utsname.h>
  25 #include <sys/wait.h>
  26
  27 #include <ctype.h>
  28 #include <errno.h>
  29 #include <fcntl.h>
  30 #include <fnmatch.h>
  31 #include <getopt.h>
  32 #include <stdarg.h>
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36 #include <unistd.h>
  37
  38 #include "busybox.h"
  39 #include "config.h"
  40
  41 #define IFUPDOWN_VERSION "0.6.4"
  42
  43 typedef struct interface_defn interface_defn;
  44
  45 typedef int (execfn)(char *command);
  46 typedef int (command_set)(interface_defn *ifd, execfn *e);
  47
  48 typedef struct method {
  49         char *name;
  50         command_set *up;
  51         command_set *down;
  52 } method;
  53
  54 typedef struct address_family {
  55         char *name;
  56         int n_methods;
  57         method *method;
  58 } address_family;
  59
  60 typedef struct mapping_defn {
  61         struct mapping_defn *next;
  62
  63         int max_matches;
  64         int n_matches;
  65         char **match;
  66
  67         char *script;
  68
  69         int max_mappings;
  70         int n_mappings;
  71         char **mapping;
  72 } mapping_defn;
  73
  74 typedef struct variable {
  75         char *name;
  76         char *value;
  77 } variable;
  78
  79 struct interface_defn {
  80         struct interface_defn *next;
  81
  82         char *iface;
  83         address_family *address_family;
  84         method *method;
  85
  86         int automatic;
  87
  88         int max_options;
  89         int n_options;
  90         variable *option;
  91 };
  92
  93 typedef struct interfaces_file {
  94         int max_autointerfaces;
  95         int n_autointerfaces;
  96         char **autointerfaces;
  97
  98         interface_defn *ifaces;
  99         mapping_defn *mappings;
 100 } interfaces_file;
 101
 102 #define MAX_OPT_DEPTH 10
 103 #define EUNBALBRACK 10001
 104 #define EUNDEFVAR   10002
 105 #define MAX_VARNAME    32
 106 #define EUNBALPER   10000
 107
 108 static int no_act = 0;
 109 static int verbose = 0;
 110 static char **environ = NULL;
 111
 112 static int execable(char *program)
 113 {
 114         struct stat buf;
 115         if (0 == stat(program, &buf)) {
 116                 if (S_ISREG(buf.st_mode) && (S_IXUSR & buf.st_mode)) {
 117                         return(1);
 118                 }
 119         }
 120         return(0);
 121 }
 122
 123 static void addstr(char **buf, size_t *len, size_t *pos, char *str, size_t str_length)
 124 {
 125         if (*pos + str_length >= *len) {
 126                 char *newbuf;
 127
 128                 newbuf = xrealloc(*buf, *len * 2 + str_length + 1);
 129                 *buf = newbuf;
 130                 *len = *len * 2 + str_length + 1;
 131         }
 132
 133         while (str_length-- >= 1) {
 134                 (*buf)[(*pos)++] = *str;
 135                 str++;
 136         }
 137         (*buf)[*pos] = '\0';
 138 }
 139
 140 static int strncmpz(char *l, char *r, size_t llen)
 141 {
 142         int i = strncmp(l, r, llen);
 143
 144         if (i == 0) {
 145                 return(-r[llen]);
 146         } else {
 147                 return(i);
 148         }
 149 }
 150
 151 static char *get_var(char *id, size_t idlen, interface_defn *ifd)
 152 {
 153         int i;
 154
 155         if (strncmpz(id, "iface", idlen) == 0) {
 156                 return (ifd->iface);
 157         } else {
 158                 for (i = 0; i < ifd->n_options; i++) {
 159                         if (strncmpz(id, ifd->option[i].name, idlen) == 0) {
 160                                 return (ifd->option[i].value);
 161                         }
 162                 }
 163         }
 164
 165         return(NULL);
 166 }
 167
 168 static char *parse(char *command, interface_defn *ifd)
 169 {
 170
 171         char *result = NULL;
 172         size_t pos = 0, len = 0;
 173         size_t old_pos[MAX_OPT_DEPTH] = { 0 };
 174         int okay[MAX_OPT_DEPTH] = { 1 };
 175         int opt_depth = 1;
 176
 177         while (*command) {
 178                 switch (*command) {
 179
 180                 default:
 181                         addstr(&result, &len, &pos, command, 1);
 182                         command++;
 183                         break;
 184                 case '\\':
 185                         if (command[1]) {
 186                                 addstr(&result, &len, &pos, command + 1, 1);
 187                                 command += 2;
 188                         } else {
 189                                 addstr(&result, &len, &pos, command, 1);
 190                                 command++;
 191                         }
 192                         break;
 193                 case '[':
 194                         if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) {
 195                                 old_pos[opt_depth] = pos;
 196                                 okay[opt_depth] = 1;
 197                                 opt_depth++;
 198                                 command += 2;
 199                         } else {
 200                                 addstr(&result, &len, &pos, "[", 1);
 201                                 command++;
 202                         }
 203                         break;
 204                 case ']':
 205                         if (command[1] == ']' && opt_depth > 1) {
 206                                 opt_depth--;
 207                                 if (!okay[opt_depth]) {
 208                                         pos = old_pos[opt_depth];
 209                                         result[pos] = '\0';
 210                                 }
 211                                 command += 2;
 212                         } else {
 213                                 addstr(&result, &len, &pos, "]", 1);
 214                                 command++;
 215                         }
 216                         break;
 217                 case '%':
 218                 {
 219                         char *nextpercent;
 220                         char *varvalue;
 221
 222                         command++;
 223                         nextpercent = strchr(command, '%');
 224                         if (!nextpercent) {
 225                                 errno = EUNBALPER;
 226                                 free(result);
 227                                 return (NULL);
 228                         }
 229
 230                         varvalue = get_var(command, nextpercent - command, ifd);
 231
 232                         if (varvalue) {
 233                                 addstr(&result, &len, &pos, varvalue, xstrlen(varvalue));
 234                         } else {
 235                                 okay[opt_depth - 1] = 0;
 236                         }
 237
 238                         command = nextpercent + 1;
 239                 }
 240                         break;
 241                 }
 242         }
 243
 244         if (opt_depth > 1) {
 245                 errno = EUNBALBRACK;
 246                 free(result);
 247                 return(NULL);
 248         }
 249
 250         if (!okay[0]) {
 251                 errno = EUNDEFVAR;
 252                 free(result);
 253                 return(NULL);
 254         }
 255
 256         return(result);
 257 }
 258
 259 static int execute(char *command, interface_defn *ifd, execfn *exec)
 260 {
 261         char *out;
 262         int ret;
 263
 264         out = parse(command, ifd);
 265         if (!out) {
 266                 return(0);
 267         }
 268
 269         ret = (*exec) (out);
 270
 271         free(out);
 272         return(ret);
 273 }
 274
 275 #ifdef CONFIG_FEATURE_IFUPDOWN_IPX
 276 static int static_up_ipx(interface_defn *ifd, execfn *exec)
 277 {
 278         if (!execute("ipx_interface add %iface% %frame% %netnum%", ifd, exec)) {
 279                 return(0);
 280         }
 281         return(1);
 282 }
 283
 284 static int static_down_ipx(interface_defn *ifd, execfn *exec)
 285 {
 286         if (!execute("ipx_interface del %iface% %frame%", ifd, exec)) {
 287                 return(0);
 288         }
 289         return(1);
 290 }
 291
 292 static int dynamic_up(interface_defn *ifd, execfn *exec)
 293 {
 294         if (!execute("ipx_interface add %iface% %frame%", ifd, exec)) {
 295                 return(0);
 296         }
 297         return(1);
 298 }
 299
 300 static int dynamic_down(interface_defn *ifd, execfn *exec)
 301 {
 302         if (!execute("ipx_interface del %iface% %frame%", ifd, exec)) {
 303                 return(0);
 304         }
 305         return(1);
 306 }
 307
 308 static method methods_ipx[] = {
 309         { "dynamic", dynamic_up, dynamic_down, },
 310         { "static", static_up_ipx, static_down_ipx, },
 311 };
 312
 313 address_family addr_ipx = {
 314         "ipx",
 315         sizeof(methods_ipx) / sizeof(struct method),
 316         methods_ipx
 317 };
 318 #endif /* IFUP_FEATURE_IPX */
 319
 320 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
 321 static int loopback_up6(interface_defn *ifd, execfn *exec)
 322 {
 323         if (!execute("ifconfig %iface% add ::1", ifd, exec)) {
 324                 return(0);
 325         }
 326         return(1);
 327 }
 328
 329 static int loopback_down6(interface_defn *ifd, execfn *exec)
 330 {
 331         if (!execute("ifconfig %iface% del ::1", ifd, exec))
 332                 return(0);
 333         }
 334         return(1);
 335 }
 336
 337 static int static_up6(interface_defn *ifd, execfn *exec)
 338 {
 339         if (!execute("ifconfig %iface% [[media %media%]] [[hw %hwaddress%]] [[mtu %mtu%]] up", ifd, exec)) {
 340                 return(0);
 341         }
 342         if (!execute("ifconfig %iface% add %address%/%netmask%", ifd, exec)) {
 343                 return(0);
 344         }
 345         if (!execute("[[ route -A inet6 add ::/0 gw %gateway% ]]", ifd, exec)) {
 346                 return(0);
 347         }
 348         return(1);
 349 }
 350
 351 static int static_down6(interface_defn *ifd, execfn *exec)
 352 {
 353         if (!execute("ifconfig %iface% down", ifd, exec)) {
 354                 return(0);
 355         }
 356         return(1);
 357 }
 358
 359 static int v4tunnel_up(interface_defn *ifd, execfn *exec)
 360 {
 361         if (!execute("ip tunnel add %iface% mode sit remote %endpoint% [[local %local%]] [[ttl %ttl%]]", ifd, exec)) {
 362                 return(0);
 363         }
 364         if (!execute("ip link set %iface% up", ifd, exec)) {
 365                 return(0);
 366         }
 367         if (!execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec)) {
 368                 return(0);
 369         }
 370         if (!execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec)) {
 371                 return(0);
 372         }
 373         return(1);
 374 }
 375
 376 static int v4tunnel_down(interface_defn * ifd, execfn * exec)
 377 {
 378         if (!execute("ip tunnel del %iface%", ifd, exec)) {
 379                 return(0);
 380         }
 381         return(1);
 382 }
 383
 384 static method methods6[] = {
 385         { "v4tunnel", v4tunnel_up, v4tunnel_down, },
 386         { "static", static_up6, static_down6, },
 387         { "loopback", loopback_up6, loopback_down6, },
 388 };
 389
 390 address_family addr_inet6 = {
 391         "inet6",
 392         sizeof(methods6) / sizeof(struct method),
 393         methods6
 394 };
 395 #endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */
 396
 397 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
 398 static int loopback_up(interface_defn *ifd, execfn *exec)
 399 {
 400         if (!execute("ifconfig %iface% 127.0.0.1 up", ifd, exec)) {
 401                 return(0);
 402         }
 403         return(1);
 404 }
 405
 406 static int loopback_down(interface_defn *ifd, execfn *exec)
 407 {
 408         if (!execute("ifconfig %iface% down", ifd, exec)) {
 409                 return(0);
 410         }
 411         return(1);
 412 }
 413
 414 static int static_up(interface_defn *ifd, execfn *exec)
 415 {
 416         if (!execute("ifconfig %iface% %address% netmask %netmask% [[broadcast %broadcast%]]    [[pointopoint %pointopoint%]] [[media %media%]] [[mtu %mtu%]]   [[hw %hwaddress%]] up",
 417                  ifd, exec)) {
 418                 return(0);
 419         }
 420         if (!execute("[[ route add default gw %gateway% %iface% ]]", ifd, exec)) {
 421                 return(0);
 422         }
 423         return(1);
 424 }
 425
 426 static int static_down(interface_defn *ifd, execfn *exec)
 427 {
 428         if (!execute("[[ route del default gw %gateway% %iface% ]]", ifd, exec)) {
 429                 return(0);
 430         }
 431         if (!execute("ifconfig %iface% down", ifd, exec)) {
 432                 return(0);
 433         }
 434         return(1);
 435 }
 436
 437 static int dhcp_up(interface_defn *ifd, execfn *exec)
 438 {
 439         if (execable("/sbin/dhclient")) {
 440                 if (!execute("dhclient -pf /var/run/dhclient.%iface%.pid %iface%", ifd, exec)) {
 441                         return(0);
 442                 }
 443         } else if (execable("/sbin/pump")) {
 444                 if (!execute("pump -i %iface% [[-h %hostname%]] [[-l %leasehours%]]", ifd, exec)) {
 445                         return(0);
 446                 }
 447         } else if (execable("/sbin/udhcpc")) {
 448                 if (!execute("udhcpc -n -p /var/run/udhcpc.%iface%.pid -i %iface% [[-H %hostname%]] [[-c %clientid%]]", ifd, exec)) {
 449                         return 0;
 450                 }
 451         } else if (execable("/sbin/dhcpcd")) {
 452                 if (!execute("dhcpcd [[-h %hostname%]] [[-i %vendor%]] [[-I %clientid%]] [[-l %leasetime%]] %iface%", ifd, exec)) {
 453                         return(0);
 454                 }
 455         }
 456         return(1);
 457 }
 458
 459 static int dhcp_down(interface_defn *ifd, execfn *exec)
 460 {
 461         if (execable("/sbin/dhclient")) {
 462                 if (!execute("cat /var/run/dhclient.%iface%.pid | xargs -i kill -TERM {}", ifd, exec)) {
 463                         return(0);
 464                 }
 465         } else if (execable("/sbin/pump")) {
 466                 if (!execute("pump -i %iface% -k", ifd, exec)) {
 467                         return(0);
 468                 }
 469         } else if (execable("/sbin/udhcpc")) {
 470                 if (!execute("cat /var/run/udhcpc.%iface%.pid | xargs -i kill -TERM {}", ifd, exec)) {
 471                         return(0);
 472                 }
 473         } else if (execable("/sbin/dhcpcd")) {
 474                 if (!execute("dhcpcd -k %iface%", ifd, exec)) {
 475                         return(0);
 476                 }
 477         }
 478         if (!execute("ifconfig %iface% down", ifd, exec)) {
 479                 return(0);
 480         }
 481         return(1);
 482 }
 483
 484 static int bootp_up(interface_defn *ifd, execfn *exec)
 485 {
 486         if (!execute("bootpc [[--bootfile %bootfile%]] --dev %iface% [[--server %server%]]            [[--hwaddr %hwaddr%]] --returniffail --serverbcast", ifd, exec)) {
 487                 return 0;
 488         }
 489         return 1;
 490 }
 491
 492 static int bootp_down(interface_defn *ifd, execfn *exec)
 493 {
 494         if (!execute("ifconfig down %iface%", ifd, exec)) {
 495                 return 0;
 496         }
 497         return 1;
 498 }
 499
 500 static int ppp_up(interface_defn *ifd, execfn *exec)
 501 {
 502         if (!execute("pon [[%provider%]]", ifd, exec)) {
 503                 return 0;
 504         }
 505         return 1;
 506 }
 507
 508 static int ppp_down(interface_defn *ifd, execfn *exec)
 509 {
 510         if (!execute("poff [[%provider%]]", ifd, exec)) {
 511                 return 0;
 512         }
 513         return 1;
 514 }
 515
 516 static int wvdial_up(interface_defn *ifd, execfn *exec)
 517 {
 518         if (!execute("/sbin/start-stop-daemon --start -x /usr/bin/wvdial -p /var/run/wvdial.%iface% -b -m -- [[ %provider% ]]", ifd, exec)) {
 519                 return 0;
 520         }
 521         return 1;
 522 }
 523
 524 static int wvdial_down(interface_defn *ifd, execfn *exec)
 525 {
 526         if (!execute ("/sbin/start-stop-daemon --stop -x /usr/bin/wvdial -p /var/run/wvdial.%iface% -s 2", ifd, exec)) {
 527                 return 0;
 528         }
 529         return 1;
 530 }
 531
 532 static method methods[] = {
 533         { "wvdial", wvdial_up, wvdial_down, },
 534         { "ppp", ppp_up, ppp_down, },
 535         { "static", static_up, static_down, },
 536         { "bootp", bootp_up, bootp_down, },
 537         { "dhcp", dhcp_up, dhcp_down, },
 538         { "loopback", loopback_up, loopback_down, },
 539 };
 540
 541 address_family addr_inet = {
 542         "inet",
 543         sizeof(methods) / sizeof(struct method),
 544         methods
 545 };
 546
 547 #endif  /* ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 */
 548
 549 static char *next_word(char *buf, char *word, int maxlen)
 550 {
 551         if (!buf)
 552                 return NULL;
 553         if (!*buf)
 554                 return NULL;
 555
 556         while (!isspace(*buf) && *buf) {
 557                 if (maxlen-- > 1)
 558                         *word++ = *buf;
 559                 buf++;
 560         }
 561         if (maxlen > 0) {
 562                 *word = '\0';
 563         }
 564
 565         while (isspace(*buf) && *buf) {
 566                 buf++;
 567         }
 568
 569         return buf;
 570 }
 571
 572 static address_family *get_address_family(address_family *af[], char *name)
 573 {
 574         int i;
 575
 576         for (i = 0; af[i]; i++) {
 577                 if (strcmp(af[i]->name, name) == 0) {
 578                         return af[i];
 579                 }
 580         }
 581         return NULL;
 582 }
 583
 584 static method *get_method(address_family *af, char *name)
 585 {
 586         int i;
 587
 588         for (i = 0; i < af->n_methods; i++) {
 589                 if (strcmp(af->method[i].name, name) == 0) {
 590                         return &af->method[i];
 591                 }
 592         }
 593         return(NULL);
 594 }
 595
 596 static int duplicate_if(interface_defn *ifa, interface_defn *ifb)
 597 {
 598         if (strcmp(ifa->iface, ifb->iface) != 0) {
 599                 return(0);
 600         }
 601         if (ifa->address_family != ifb->address_family) {
 602                 return(0);
 603         }
 604         return(1);
 605 }
 606
 607 static int get_line(char **result, size_t * result_len, FILE * f, int *line)
 608 {
 609         size_t pos;
 610
 611         do {
 612                 pos = 0;
 613                 do {
 614                         if (*result_len - pos < 10) {
 615                                 char *newstr = xrealloc(*result, *result_len * 2 + 80);
 616                                 *result = newstr;
 617                                 *result_len = *result_len * 2 + 80;
 618                         }
 619
 620                         if (!fgets(*result + pos, *result_len - pos, f)) {
 621                                 if (ferror(f) == 0 && pos == 0)
 622                                         return 0;
 623                                 if (ferror(f) != 0)
 624                                         return 0;
 625                         }
 626                         pos += xstrlen(*result + pos);
 627                 } while (pos == *result_len - 1 && (*result)[pos - 1] != '\n');
 628
 629                 if (pos != 0 && (*result)[pos - 1] == '\n') {
 630                         (*result)[--pos] = '\0';
 631                 }
 632
 633                 (*line)++;
 634                 {
 635                         int first = 0;
 636
 637                         while (isspace((*result)[first]) && (*result)[first]) {
 638                                 first++;
 639                         }
 640
 641                         memmove(*result, *result + first, pos - first + 1);
 642                         pos -= first;
 643                 }
 644         } while ((*result)[0] == '#');
 645
 646         while ((*result)[pos - 1] == '\\') {
 647                 (*result)[--pos] = '\0';
 648                 do {
 649                         if (*result_len - pos < 10) {
 650                                 char *newstr = xrealloc(*result, *result_len * 2 + 80);
 651                                 *result = newstr;
 652                                 *result_len = *result_len * 2 + 80;
 653                         }
 654
 655                         if (!fgets(*result + pos, *result_len - pos, f)) {
 656                                 if (ferror(f) == 0 && pos == 0)
 657                                         return 0;
 658                                 if (ferror(f) != 0)
 659                                         return 0;
 660                         }
 661                         pos += xstrlen(*result + pos);
 662                 } while (pos == *result_len - 1 && (*result)[pos - 1] != '\n');
 663
 664                 if (pos != 0 && (*result)[pos - 1] == '\n') {
 665                         (*result)[--pos] = '\0';
 666                 }
 667                 (*line)++;
 668         }
 669
 670         while (isspace((*result)[pos - 1])) {   /* remove trailing whitespace */
 671                 pos--;
 672         }
 673         (*result)[pos] = '\0';
 674
 675         return 1;
 676 }
 677
 678 static interfaces_file *read_interfaces(char *filename)
 679 {
 680         interface_defn *currif = NULL;
 681         interfaces_file *defn;
 682         mapping_defn *currmap = NULL;
 683         FILE *f;
 684         char firstword[80];
 685         char *buf = NULL;
 686         char *rest;
 687         int line;
 688         size_t buf_len = 0;
 689
 690         enum { NONE, IFACE, MAPPING } currently_processing = NONE;
 691
 692         defn = xmalloc(sizeof(interfaces_file));
 693         defn->max_autointerfaces = defn->n_autointerfaces = 0;
 694         defn->autointerfaces = NULL;
 695         defn->mappings = NULL;
 696         defn->ifaces = NULL;
 697         f = fopen(filename, "r");
 698         if (f == NULL) {
 699                 return NULL;
 700         }
 701         line = 0;
 702
 703         while (get_line(&buf, &buf_len, f, &line)) {
 704                 rest = next_word(buf, firstword, 80);
 705                 if (rest == NULL) {
 706                         continue;       /* blank line */
 707                 }
 708
 709                 if (strcmp(firstword, "mapping") == 0) {
 710
 711                         currmap = xmalloc(sizeof(mapping_defn));
 712                         currmap->max_matches = 0;
 713                         currmap->n_matches = 0;
 714                         currmap->match = NULL;
 715
 716                         while ((rest = next_word(rest, firstword, 80))) {
 717                                 if (currmap->max_matches == currmap->n_matches) {
 718                                         currmap->max_matches = currmap->max_matches * 2 + 1;
 719                                         currmap->match = xrealloc(currmap->match, sizeof(currmap->match) * currmap->max_matches);
 720                                 }
 721
 722                                 currmap->match[currmap->n_matches++] = xstrdup(firstword);
 723                         }
 724                         currmap->max_mappings = 0;
 725                         currmap->n_mappings = 0;
 726                         currmap->mapping = NULL;
 727                         currmap->script = NULL;
 728                         {
 729                                 mapping_defn **where = &defn->mappings;
 730                                 while (*where != NULL) {
 731                                         where = &(*where)->next;
 732                                 }
 733                                 *where = currmap;
 734                                 currmap->next = NULL;
 735                         }
 736                         currently_processing = MAPPING;
 737                 } else if (strcmp(firstword, "iface") == 0) {
 738                         {
 739                                 char iface_name[80];
 740                                 char address_family_name[80];
 741                                 char method_name[80];
 742                                 address_family *addr_fams[] = {
 743 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
 744                                         &addr_inet,
 745 #endif
 746 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
 747                                         &addr_inet6,
 748 #endif
 749 #ifdef CONFIG_FEATURE_IFUPDOWN_IPX
 750                                         &addr_ipx,
 751 #endif
 752                                         NULL
 753                                 };
 754
 755                                 currif = xmalloc(sizeof(interface_defn));
 756
 757                                 rest = next_word(rest, iface_name, 80);
 758                                 rest = next_word(rest, address_family_name, 80);
 759                                 rest = next_word(rest, method_name, 80);
 760
 761                                 if (rest == NULL) {
 762                                         error_msg("%s:%d: too few parameters for iface line", filename, line);
 763                                         return NULL;
 764                                 }
 765
 766                                 if (rest[0] != '\0') {
 767                                         error_msg("%s:%d: too many parameters for iface line", filename, line);
 768                                         return NULL;
 769                                 }
 770
 771                                 currif->iface = xstrdup(iface_name);
 772
 773                                 currif->address_family = get_address_family(addr_fams, address_family_name);
 774                                 if (!currif->address_family) {
 775                                         error_msg("%s:%d: unknown address type", filename, line);
 776                                         return NULL;
 777                                 }
 778
 779                                 currif->method = get_method(currif->address_family, method_name);
 780                                 if (!currif->method) {
 781                                         error_msg("%s:%d: unknown method", filename, line);
 782                                         return NULL;
 783                                 }
 784
 785                                 currif->automatic = 1;
 786                                 currif->max_options = 0;
 787                                 currif->n_options = 0;
 788                                 currif->option = NULL;
 789
 790
 791                                 {
 792                                         interface_defn **where = &defn->ifaces;
 793
 794                                         while (*where != NULL) {
 795                                                 if (duplicate_if(*where, currif)) {
 796                                                         error_msg("%s:%d: duplicate interface", filename, line);
 797                                                         return NULL;
 798                                                 }
 799                                                 where = &(*where)->next;
 800                                         }
 801
 802                                         *where = currif;
 803                                         currif->next = NULL;
 804                                 }
 805                         }
 806                         currently_processing = IFACE;
 807                 } else if (strcmp(firstword, "auto") == 0) {
 808                         while ((rest = next_word(rest, firstword, 80))) {
 809                                 int i;
 810
 811                                 for (i = 0; i < defn->n_autointerfaces; i++) {
 812                                         if (strcmp(firstword, defn->autointerfaces[i]) == 0) {
 813                                                 perror_msg("%s:%d: interface declared auto twice", filename, line);
 814                                                 return NULL;
 815                                         }
 816                                 }
 817
 818                                 if (defn->n_autointerfaces == defn->max_autointerfaces) {
 819                                         char **tmp;
 820
 821                                         defn->max_autointerfaces *= 2;
 822                                         defn->max_autointerfaces++;
 823                                         tmp = xrealloc(defn->autointerfaces, sizeof(*tmp) * defn->max_autointerfaces);
 824                                         defn->autointerfaces = tmp;
 825                                 }
 826
 827                                 defn->autointerfaces[defn->n_autointerfaces] = xstrdup(firstword);
 828                                 defn->n_autointerfaces++;
 829                         }
 830                         currently_processing = NONE;
 831                 } else {
 832                         switch (currently_processing) {
 833                         case IFACE:
 834                         {
 835                                 int i;
 836
 837                                 if (xstrlen(rest) == 0) {
 838                                         error_msg("%s:%d: option with empty value", filename, line);
 839                                         return NULL;
 840                                 }
 841
 842                                 if (strcmp(firstword, "up") != 0
 843                                         && strcmp(firstword, "down") != 0
 844                                         && strcmp(firstword, "pre-up") != 0
 845                                         && strcmp(firstword, "post-down") != 0) {
 846                                         for (i = 0; i < currif->n_options; i++) {
 847                                                 if (strcmp(currif->option[i].name, firstword) == 0) {
 848                                                         error_msg("%s:%d: duplicate option", filename, line);
 849                                                         return NULL;
 850                                                 }
 851                                         }
 852                                 }
 853                         }
 854                                 if (currif->n_options >= currif->max_options) {
 855                                         variable *opt;
 856
 857                                         currif->max_options = currif->max_options + 10;
 858                                         opt = xrealloc(currif->option, sizeof(*opt) * currif->max_options);
 859                                         currif->option = opt;
 860                                 }
 861                                 currif->option[currif->n_options].name = xstrdup(firstword);
 862                                 currif->option[currif->n_options].value = xstrdup(rest);
 863                                 if (!currif->option[currif->n_options].name) {
 864                                         perror(filename);
 865                                         return NULL;
 866                                 }
 867                                 if (!currif->option[currif->n_options].value) {
 868                                         perror(filename);
 869                                         return NULL;
 870                                 }
 871                                 currif->n_options++;
 872                                 break;
 873                         case MAPPING:
 874                                 if (strcmp(firstword, "script") == 0) {
 875                                         if (currmap->script != NULL) {
 876                                                 error_msg("%s:%d: duplicate script in mapping", filename, line);
 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("%s:%d: misplaced option", filename, line);
 890                                         return NULL;
 891                                 }
 892                                 break;
 893                         case NONE:
 894                         default:
 895                                 error_msg("%s:%d: misplaced option", filename, line);
 896                                 return NULL;
 897                         }
 898                 }
 899         }
 900         if (ferror(f) != 0) {
 901                 perror_msg("%s", filename);
 902                 return NULL;
 903         }
 904         fclose(f);
 905         line = -1;
 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 *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                 default:                /* parent */
1000                 }
1001                 waitpid(child, &status, 0);
1002                 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
1003                         return 0;
1004                 }
1005         }
1006         return (1);
1007 }
1008
1009 static int execute_all(interface_defn *ifd, execfn *exec, char *opt)
1010 {
1011         int i;
1012         char buf[100];
1013
1014         for (i = 0; i < ifd->n_options; i++) {
1015                 if (strcmp(ifd->option[i].name, opt) == 0) {
1016                         if (!(*exec) (ifd->option[i].value)) {
1017                                 return 0;
1018                         }
1019                 }
1020         }
1021
1022         sprintf(buf, "run-parts /etc/network/if-%s.d", opt);
1023         (*exec) (buf);
1024
1025         return (1);
1026 }
1027
1028 static int iface_up(interface_defn *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 *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 static int popen2(FILE **in, FILE **out, char *command, ...)
1067 {
1068         va_list ap;
1069         char *argv[11] = { command };
1070         int argc;
1071         int infd[2], outfd[2];
1072         pid_t pid;
1073
1074         argc = 1;
1075         va_start(ap, command);
1076         while ((argc < 10) && (argv[argc] = va_arg(ap, char *))) {
1077                 argc++;
1078         }
1079         argv[argc] = NULL;      /* make sure */
1080         va_end(ap);
1081
1082         if (pipe(infd) != 0) {
1083                 return 0;
1084         }
1085
1086         if (pipe(outfd) != 0) {
1087                 close(infd[0]);
1088                 close(infd[1]);
1089                 return 0;
1090         }
1091
1092         fflush(NULL);
1093         switch (pid = fork()) {
1094         case -1:                        /* failure */
1095                 close(infd[0]);
1096                 close(infd[1]);
1097                 close(outfd[0]);
1098                 close(outfd[1]);
1099                 return 0;
1100         case 0:                 /* child */
1101                 dup2(infd[0], 0);
1102                 dup2(outfd[1], 1);
1103                 close(infd[0]);
1104                 close(infd[1]);
1105                 close(outfd[0]);
1106                 close(outfd[1]);
1107                 execvp(command, argv);
1108                 exit(127);
1109         default:                        /* parent */
1110                 *in = fdopen(infd[1], "w");
1111                 *out = fdopen(outfd[0], "r");
1112                 close(infd[0]);
1113                 close(outfd[1]);
1114                 return pid;
1115         }
1116         /* unreached */
1117 }
1118
1119 static int run_mapping(char *physical, char *logical, int len, mapping_defn * map)
1120 {
1121         FILE *in, *out;
1122         int i, status;
1123         pid_t pid;
1124
1125
1126         pid = popen2(&in, &out, map->script, physical, NULL);
1127         if (pid == 0) {
1128                 return 0;
1129         }
1130         for (i = 0; i < map->n_mappings; i++) {
1131                 fprintf(in, "%s\n", map->mapping[i]);
1132         }
1133         fclose(in);
1134         waitpid(pid, &status, 0);
1135         if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
1136                 if (fgets(logical, len, out)) {
1137                         char *pch = logical + xstrlen(logical) - 1;
1138
1139                         while (pch >= logical && isspace(*pch))
1140                                 *(pch--) = '\0';
1141                 }
1142         }
1143         fclose(out);
1144
1145         return 1;
1146 }
1147
1148 static int lookfor_iface(char **ifaces, int n_ifaces, char *iface)
1149 {
1150         int i;
1151
1152         for (i = 0; i < n_ifaces; i++) {
1153                 if (strncmp(iface, ifaces[i], xstrlen(iface)) == 0) {
1154                         if (ifaces[i][xstrlen(iface)] == '=') {
1155                                 return i;
1156                         }
1157                 }
1158         }
1159
1160         return(-1);
1161 }
1162
1163 static void add_to_state(char ***ifaces, int *n_ifaces, int *max_ifaces, char *new_iface)
1164 {
1165         if (*max_ifaces == *n_ifaces) {
1166                 *max_ifaces = (*max_ifaces * 2) + 1;
1167                 *ifaces = xrealloc(*ifaces, sizeof(**ifaces) * *max_ifaces);
1168         }
1169
1170         (*ifaces)[(*n_ifaces)++] = new_iface;
1171 }
1172
1173 extern int ifupdown_main(int argc, char **argv)
1174 {
1175         int (*cmds) (interface_defn *) = NULL;
1176         struct option long_opts[] = {
1177                 {"help", no_argument, NULL, 'h'},
1178                 {"verbose", no_argument, NULL, 'v'},
1179                 {"all", no_argument, NULL, 'a'},
1180                 {"interfaces", required_argument, NULL, 'i'},
1181                 {"no-act", no_argument, NULL, 'n'},
1182                 {"no-mappings", no_argument, NULL, 1},
1183                 {"force", no_argument, NULL, 2},
1184                 {0, 0, 0, 0}
1185         };
1186         interfaces_file *defn;
1187         FILE *state_fp = NULL;
1188         char **target_iface = NULL;
1189         char **state = NULL;    /* list of iface=liface */
1190         char *interfaces = "/etc/network/interfaces";
1191         char *statefile = "/etc/network/ifstate";
1192
1193         int do_all = 0;
1194         int run_mappings = 1;
1195         int force = 0;
1196         int n_target_ifaces = 0;
1197         int n_state = 0;
1198         int max_state = 0;
1199         int i;
1200
1201         if (applet_name[2] == 'u') {
1202                 /* ifup command */
1203                 cmds = iface_up;
1204         } else {
1205                 /* ifdown command */
1206                 cmds = iface_down;
1207         }
1208
1209         while ((i = getopt_long(argc, argv, "i:hvna", long_opts, NULL)) != EOF) {
1210                 switch (i) {
1211                 case 'i':
1212                         interfaces = xstrdup(optarg);
1213                         break;
1214                 case 'v':
1215                         verbose = 1;
1216                         break;
1217                 case 'a':
1218                         do_all = 1;
1219                         break;
1220                 case 'n':
1221                         no_act = 1;
1222                         break;
1223                 case 1:
1224                         run_mappings = 0;
1225                         break;
1226                 case 2:
1227                         force = 1;
1228                         break;
1229                 default:
1230                         show_usage();
1231                         break;
1232                 }
1233         }
1234
1235         if (argc - optind > 0) {
1236                 if (do_all) {
1237                         show_usage();
1238                 }
1239         } else {
1240                 if (!do_all) {
1241                         show_usage();
1242                 }
1243         }
1244
1245         defn = read_interfaces(interfaces);
1246         if (!defn) {
1247                 error_msg_and_die("couldn't read interfaces file \"%s\"", interfaces);
1248         }
1249
1250         state_fp = fopen(statefile, no_act ? "r" : "a+");
1251         if (state_fp == NULL && !no_act) {
1252                 perror_msg_and_die("failed to open statefile %s", statefile);
1253         }
1254
1255         if (state_fp != NULL) {
1256                 char buf[80];
1257                 char *p;
1258
1259                 if (!no_act) {
1260                         int flags;
1261                         struct flock lock;
1262                         const int state_fd = fileno(state_fp);
1263
1264                         flags = fcntl(state_fd, F_GETFD);
1265                         if ((flags < 0) || (fcntl(state_fd, F_SETFD, flags | FD_CLOEXEC) < 0)) {
1266                                 perror_msg_and_die("failed to set FD_CLOEXEC on statefile %s", statefile);
1267                         }
1268
1269                         lock.l_type = F_WRLCK;
1270                         lock.l_whence = SEEK_SET;
1271                         lock.l_start = 0;
1272                         lock.l_len = 0;
1273
1274                         if (fcntl(state_fd, F_SETLKW, &lock) < 0) {
1275                                 perror_msg_and_die("failed to lock statefile %s", statefile);
1276                         }
1277                 }
1278
1279                 rewind(state_fp);
1280                 while ((p = fgets(buf, sizeof buf, state_fp)) != NULL) {
1281                         char *pch;
1282
1283                         pch = buf + xstrlen(buf) - 1;
1284                         while (pch > buf && isspace(*pch)) {
1285                                 pch--;
1286                         }
1287                         *(pch + 1) = '\0';
1288
1289                         pch = buf;
1290                         while (isspace(*pch)) {
1291                                 pch++;
1292                         }
1293
1294                         add_to_state(&state, &n_state, &max_state, xstrdup(pch));
1295                 }
1296         }
1297
1298         if (do_all) {
1299                 if (cmds == iface_up) {
1300                         target_iface = defn->autointerfaces;
1301                         n_target_ifaces = defn->n_autointerfaces;
1302                 } else if (cmds == iface_down) {
1303                         target_iface = state;
1304                         n_target_ifaces = n_state;
1305                 }
1306         } else {
1307                 target_iface = argv + optind;
1308                 n_target_ifaces = argc - optind;
1309         }
1310
1311
1312         for (i = 0; i < n_target_ifaces; i++) {
1313                 interface_defn *currif;
1314                 char iface[80];
1315                 char liface[80];
1316                 char *pch;
1317                 int okay = 0;
1318
1319                 strncpy(iface, target_iface[i], sizeof(iface));
1320                 iface[sizeof(iface) - 1] = '\0';
1321
1322                 if ((pch = strchr(iface, '='))) {
1323                         *pch = '\0';
1324                         strncpy(liface, pch + 1, sizeof(liface));
1325                         liface[sizeof(liface) - 1] = '\0';
1326                 } else {
1327                         strncpy(liface, iface, sizeof(liface));
1328                         liface[sizeof(liface) - 1] = '\0';
1329                 }
1330                 if (!force) {
1331                         int already_up = lookfor_iface(state, n_state, iface);;
1332
1333                         if (cmds == iface_up) {
1334                                 /* ifup */
1335                                 if (already_up != -1) {
1336                                         error_msg("interface %s already configured", iface);
1337                                         continue;
1338                                 }
1339                         } else {
1340                                 /* ifdown */
1341                                 if (already_up == -1) {
1342                                         error_msg("interface %s not configured", iface);
1343                                         continue;
1344                                 }
1345                                 strncpy(liface, strchr(state[already_up], '=') + 1, 80);
1346                                 liface[79] = 0;
1347                         }
1348                 }
1349
1350                 if ((cmds == iface_up) && run_mappings) {
1351                         mapping_defn *currmap;
1352
1353                         for (currmap = defn->mappings; currmap; currmap = currmap->next) {
1354
1355                                 for (i = 0; i < currmap->n_matches; i++) {
1356                                         if (fnmatch(currmap->match[i], liface, 0) != 0)
1357                                                 continue;
1358                                         if (verbose) {
1359                                                 error_msg("Running mapping script %s on %s", currmap->script, liface);
1360                                         }
1361                                         run_mapping(iface, liface, sizeof(liface), currmap);
1362                                         break;
1363                                 }
1364                         }
1365                 }
1366
1367
1368                 for (currif = defn->ifaces; currif; currif = currif->next) {
1369                         if (strcmp(liface, currif->iface) == 0) {
1370                                 char *oldiface = currif->iface;
1371
1372                                 okay = 1;
1373
1374                                 currif->iface = iface;
1375
1376                                 if (verbose) {
1377                                         error_msg("Configuring interface %s=%s (%s)", iface, liface, currif->address_family->name);
1378                                 }
1379
1380                                 switch (cmds(currif)) {
1381                                 case -1:
1382                                         printf
1383                                                 ("Don't seem to be have all the variables for %s/%s.\n",
1384                                                  liface, currif->address_family->name);
1385                                         break;
1386                                 case 0:
1387                                         /* this wasn't entirely successful, should it be added to
1388                                          *      the state file?
1389                                          */
1390                                 case 1:
1391                                         /* successful */
1392                                 }
1393                                 currif->iface = oldiface;
1394                         }
1395                 }
1396
1397                 if (!okay && !force) {
1398                         error_msg("Ignoring unknown interface %s=%s.", iface, liface);
1399                 } else {
1400                         int already_up = lookfor_iface(state, n_state, iface);
1401
1402                         if (cmds == iface_up) {
1403                                 char *newiface = xmalloc(xstrlen(iface) + 1 + xstrlen(liface) + 1);
1404                                 sprintf(newiface, "%s=%s", iface, liface);
1405                                 if (already_up == -1) {
1406                                         add_to_state(&state, &n_state, &max_state, newiface);
1407                                 } else {
1408                                         free(state[already_up]);
1409                                         state[already_up] = newiface;
1410                                 }
1411                         } else if (cmds == iface_down) {
1412                                 if (already_up != -1) {
1413                                         state[already_up] = state[--n_state];
1414                                 }
1415                         }
1416                 }
1417                 if (state_fp != NULL && !no_act) {
1418                         if (ftruncate(fileno(state_fp), 0) < 0) {
1419                                 error_msg_and_die("failed to truncate statefile %s: %s", statefile, strerror(errno));
1420                         }
1421
1422                         rewind(state_fp);
1423                         for (i = 0; i < n_state; i++) {
1424                                 fputs(state[i], state_fp);
1425                                 fputc('\n', state_fp);
1426                         }
1427                         fflush(state_fp);
1428                 }
1429         }
1430
1431         if (state_fp != NULL) {
1432                 fclose(state_fp);
1433                 state_fp = NULL;
1434         }
1435
1436         return 0;
1437 }