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 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
  61 typedef struct mapping_defn {
  62         struct mapping_defn *next;
  63
  64         int max_matches;
  65         int n_matches;
  66         char **match;
  67
  68         char *script;
  69
  70         int max_mappings;
  71         int n_mappings;
  72         char **mapping;
  73 } mapping_defn;
  74 #endif
  75
  76 typedef struct variable {
  77         char *name;
  78         char *value;
  79 } variable;
  80
  81 struct interface_defn {
  82         struct interface_defn *next;
  83
  84         char *iface;
  85         address_family *address_family;
  86         method *method;
  87
  88         int automatic;
  89
  90         int max_options;
  91         int n_options;
  92         variable *option;
  93 };
  94
  95 typedef struct interfaces_file {
  96         int max_autointerfaces;
  97         int n_autointerfaces;
  98         char **autointerfaces;
  99
 100         interface_defn *ifaces;
 101 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 102         mapping_defn *mappings;
 103 #endif
 104 } interfaces_file;
 105
 106 #define MAX_OPT_DEPTH 10
 107 #define EUNBALBRACK 10001
 108 #define EUNDEFVAR   10002
 109 #define MAX_VARNAME    32
 110 #define EUNBALPER   10000
 111
 112 static int no_act = 0;
 113 static int verbose = 0;
 114 static char **environ = NULL;
 115
 116 static void addstr(char **buf, size_t *len, size_t *pos, char *str, size_t str_length)
 117 {
 118         if (*pos + str_length >= *len) {
 119                 char *newbuf;
 120
 121                 newbuf = xrealloc(*buf, *len * 2 + str_length + 1);
 122                 *buf = newbuf;
 123                 *len = *len * 2 + str_length + 1;
 124         }
 125
 126         while (str_length-- >= 1) {
 127                 (*buf)[(*pos)++] = *str;
 128                 str++;
 129         }
 130         (*buf)[*pos] = '\0';
 131 }
 132
 133 static int strncmpz(char *l, char *r, size_t llen)
 134 {
 135         int i = strncmp(l, r, llen);
 136
 137         if (i == 0) {
 138                 return(-r[llen]);
 139         } else {
 140                 return(i);
 141         }
 142 }
 143
 144 static char *get_var(char *id, size_t idlen, interface_defn *ifd)
 145 {
 146         int i;
 147
 148         if (strncmpz(id, "iface", idlen) == 0) {
 149                 return (ifd->iface);
 150         } else {
 151                 for (i = 0; i < ifd->n_options; i++) {
 152                         if (strncmpz(id, ifd->option[i].name, idlen) == 0) {
 153                                 return (ifd->option[i].value);
 154                         }
 155                 }
 156         }
 157
 158         return(NULL);
 159 }
 160
 161 static char *parse(char *command, interface_defn *ifd)
 162 {
 163
 164         char *result = NULL;
 165         size_t pos = 0, len = 0;
 166         size_t old_pos[MAX_OPT_DEPTH] = { 0 };
 167         int okay[MAX_OPT_DEPTH] = { 1 };
 168         int opt_depth = 1;
 169
 170         while (*command) {
 171                 switch (*command) {
 172
 173                 default:
 174                         addstr(&result, &len, &pos, command, 1);
 175                         command++;
 176                         break;
 177                 case '\\':
 178                         if (command[1]) {
 179                                 addstr(&result, &len, &pos, command + 1, 1);
 180                                 command += 2;
 181                         } else {
 182                                 addstr(&result, &len, &pos, command, 1);
 183                                 command++;
 184                         }
 185                         break;
 186                 case '[':
 187                         if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) {
 188                                 old_pos[opt_depth] = pos;
 189                                 okay[opt_depth] = 1;
 190                                 opt_depth++;
 191                                 command += 2;
 192                         } else {
 193                                 addstr(&result, &len, &pos, "[", 1);
 194                                 command++;
 195                         }
 196                         break;
 197                 case ']':
 198                         if (command[1] == ']' && opt_depth > 1) {
 199                                 opt_depth--;
 200                                 if (!okay[opt_depth]) {
 201                                         pos = old_pos[opt_depth];
 202                                         result[pos] = '\0';
 203                                 }
 204                                 command += 2;
 205                         } else {
 206                                 addstr(&result, &len, &pos, "]", 1);
 207                                 command++;
 208                         }
 209                         break;
 210                 case '%':
 211                 {
 212                         char *nextpercent;
 213                         char *varvalue;
 214
 215                         command++;
 216                         nextpercent = strchr(command, '%');
 217                         if (!nextpercent) {
 218                                 errno = EUNBALPER;
 219                                 free(result);
 220                                 return (NULL);
 221                         }
 222
 223                         varvalue = get_var(command, nextpercent - command, ifd);
 224
 225                         if (varvalue) {
 226                                 addstr(&result, &len, &pos, varvalue, xstrlen(varvalue));
 227                         } else {
 228                                 okay[opt_depth - 1] = 0;
 229                         }
 230
 231                         command = nextpercent + 1;
 232                 }
 233                         break;
 234                 }
 235         }
 236
 237         if (opt_depth > 1) {
 238                 errno = EUNBALBRACK;
 239                 free(result);
 240                 return(NULL);
 241         }
 242
 243         if (!okay[0]) {
 244                 errno = EUNDEFVAR;
 245                 free(result);
 246                 return(NULL);
 247         }
 248
 249         return(result);
 250 }
 251
 252 static int execute(char *command, interface_defn *ifd, execfn *exec)
 253 {
 254         char *out;
 255         int ret;
 256
 257         out = parse(command, ifd);
 258         if (!out) {
 259                 return(0);
 260         }
 261
 262         ret = (*exec) (out);
 263
 264         free(out);
 265         return(ret);
 266 }
 267
 268 #ifdef CONFIG_FEATURE_IFUPDOWN_IPX
 269 static int static_up_ipx(interface_defn *ifd, execfn *exec)
 270 {
 271         if (!execute("ipx_interface add %iface% %frame% %netnum%", ifd, exec)) {
 272                 return(0);
 273         }
 274         return(1);
 275 }
 276
 277 static int static_down_ipx(interface_defn *ifd, execfn *exec)
 278 {
 279         if (!execute("ipx_interface del %iface% %frame%", ifd, exec)) {
 280                 return(0);
 281         }
 282         return(1);
 283 }
 284
 285 static int dynamic_up(interface_defn *ifd, execfn *exec)
 286 {
 287         if (!execute("ipx_interface add %iface% %frame%", ifd, exec)) {
 288                 return(0);
 289         }
 290         return(1);
 291 }
 292
 293 static int dynamic_down(interface_defn *ifd, execfn *exec)
 294 {
 295         if (!execute("ipx_interface del %iface% %frame%", ifd, exec)) {
 296                 return(0);
 297         }
 298         return(1);
 299 }
 300
 301 static method methods_ipx[] = {
 302         { "dynamic", dynamic_up, dynamic_down, },
 303         { "static", static_up_ipx, static_down_ipx, },
 304 };
 305
 306 address_family addr_ipx = {
 307         "ipx",
 308         sizeof(methods_ipx) / sizeof(struct method),
 309         methods_ipx
 310 };
 311 #endif /* IFUP_FEATURE_IPX */
 312
 313 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
 314 static int loopback_up6(interface_defn *ifd, execfn *exec)
 315 {
 316         if (!execute("ifconfig %iface% add ::1", ifd, exec)) {
 317                 return(0);
 318         }
 319         return(1);
 320 }
 321
 322 static int loopback_down6(interface_defn *ifd, execfn *exec)
 323 {
 324         if (!execute("ifconfig %iface% del ::1", ifd, exec))
 325                 return(0);
 326         }
 327         return(1);
 328 }
 329
 330 static int static_up6(interface_defn *ifd, execfn *exec)
 331 {
 332         if (!execute("ifconfig %iface% [[media %media%]] [[hw %hwaddress%]] [[mtu %mtu%]] up", ifd, exec)) {
 333                 return(0);
 334         }
 335         if (!execute("ifconfig %iface% add %address%/%netmask%", ifd, exec)) {
 336                 return(0);
 337         }
 338         if (!execute("[[ route -A inet6 add ::/0 gw %gateway% ]]", ifd, exec)) {
 339                 return(0);
 340         }
 341         return(1);
 342 }
 343
 344 static int static_down6(interface_defn *ifd, execfn *exec)
 345 {
 346         if (!execute("ifconfig %iface% down", ifd, exec)) {
 347                 return(0);
 348         }
 349         return(1);
 350 }
 351
 352 static int v4tunnel_up(interface_defn *ifd, execfn *exec)
 353 {
 354         if (!execute("ip tunnel add %iface% mode sit remote %endpoint% [[local %local%]] [[ttl %ttl%]]", ifd, exec)) {
 355                 return(0);
 356         }
 357         if (!execute("ip link set %iface% up", ifd, exec)) {
 358                 return(0);
 359         }
 360         if (!execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec)) {
 361                 return(0);
 362         }
 363         if (!execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec)) {
 364                 return(0);
 365         }
 366         return(1);
 367 }
 368
 369 static int v4tunnel_down(interface_defn * ifd, execfn * exec)
 370 {
 371         if (!execute("ip tunnel del %iface%", ifd, exec)) {
 372                 return(0);
 373         }
 374         return(1);
 375 }
 376
 377 static method methods6[] = {
 378         { "v4tunnel", v4tunnel_up, v4tunnel_down, },
 379         { "static", static_up6, static_down6, },
 380         { "loopback", loopback_up6, loopback_down6, },
 381 };
 382
 383 address_family addr_inet6 = {
 384         "inet6",
 385         sizeof(methods6) / sizeof(struct method),
 386         methods6
 387 };
 388 #endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */
 389
 390 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
 391 static int loopback_up(interface_defn *ifd, execfn *exec)
 392 {
 393         if (!execute("ifconfig %iface% 127.0.0.1 up", ifd, exec)) {
 394                 return(0);
 395         }
 396         return(1);
 397 }
 398
 399 static int loopback_down(interface_defn *ifd, execfn *exec)
 400 {
 401         if (!execute("ifconfig %iface% down", ifd, exec)) {
 402                 return(0);
 403         }
 404         return(1);
 405 }
 406
 407 static int static_up(interface_defn *ifd, execfn *exec)
 408 {
 409         if (!execute("ifconfig %iface% %address% netmask %netmask% [[broadcast %broadcast%]]    [[pointopoint %pointopoint%]] [[media %media%]] [[mtu %mtu%]]   [[hw %hwaddress%]] up",
 410                  ifd, exec)) {
 411                 return(0);
 412         }
 413         if (!execute("[[ route add default gw %gateway% %iface% ]]", ifd, exec)) {
 414                 return(0);
 415         }
 416         return(1);
 417 }
 418
 419 static int static_down(interface_defn *ifd, execfn *exec)
 420 {
 421         if (!execute("[[ route del default gw %gateway% %iface% ]]", ifd, exec)) {
 422                 return(0);
 423         }
 424         if (!execute("ifconfig %iface% down", ifd, exec)) {
 425                 return(0);
 426         }
 427         return(1);
 428 }
 429
 430 static int execable(char *program)
 431 {
 432         struct stat buf;
 433         if (0 == stat(program, &buf)) {
 434                 if (S_ISREG(buf.st_mode) && (S_IXUSR & buf.st_mode)) {
 435                         return(1);
 436                 }
 437         }
 438         return(0);
 439 }
 440
 441 static int dhcp_up(interface_defn *ifd, execfn *exec)
 442 {
 443         if (execable("/sbin/dhclient")) {
 444                 if (!execute("dhclient -pf /var/run/dhclient.%iface%.pid %iface%", ifd, exec)) {
 445                         return(0);
 446                 }
 447         } else if (execable("/sbin/pump")) {
 448                 if (!execute("pump -i %iface% [[-h %hostname%]] [[-l %leasehours%]]", ifd, exec)) {
 449                         return(0);
 450                 }
 451         } else if (execable("/sbin/udhcpc")) {
 452                 if (!execute("udhcpc -n -p /var/run/udhcpc.%iface%.pid -i %iface% [[-H %hostname%]] [[-c %clientid%]]", ifd, exec)) {
 453                         return 0;
 454                 }
 455         } else if (execable("/sbin/dhcpcd")) {
 456                 if (!execute("dhcpcd [[-h %hostname%]] [[-i %vendor%]] [[-I %clientid%]] [[-l %leasetime%]] %iface%", ifd, exec)) {
 457                         return(0);
 458                 }
 459         }
 460         return(1);
 461 }
 462
 463 static int dhcp_down(interface_defn *ifd, execfn *exec)
 464 {
 465         if (execable("/sbin/dhclient")) {
 466                 if (!execute("cat /var/run/dhclient.%iface%.pid | xargs -i kill -TERM {}", ifd, exec)) {
 467                         return(0);
 468                 }
 469         } else if (execable("/sbin/pump")) {
 470                 if (!execute("pump -i %iface% -k", ifd, exec)) {
 471                         return(0);
 472                 }
 473         } else if (execable("/sbin/udhcpc")) {
 474                 if (!execute("cat /var/run/udhcpc.%iface%.pid | xargs -i kill -TERM {}", ifd, exec)) {
 475                         return(0);
 476                 }
 477         } else if (execable("/sbin/dhcpcd")) {
 478                 if (!execute("dhcpcd -k %iface%", ifd, exec)) {
 479                         return(0);
 480                 }
 481         }
 482         if (!execute("ifconfig %iface% down", ifd, exec)) {
 483                 return(0);
 484         }
 485         return(1);
 486 }
 487
 488 static int bootp_up(interface_defn *ifd, execfn *exec)
 489 {
 490         if (!execute("bootpc [[--bootfile %bootfile%]] --dev %iface% [[--server %server%]]            [[--hwaddr %hwaddr%]] --returniffail --serverbcast", ifd, exec)) {
 491                 return 0;
 492         }
 493         return 1;
 494 }
 495
 496 static int bootp_down(interface_defn *ifd, execfn *exec)
 497 {
 498         if (!execute("ifconfig down %iface%", ifd, exec)) {
 499                 return 0;
 500         }
 501         return 1;
 502 }
 503
 504 static int ppp_up(interface_defn *ifd, execfn *exec)
 505 {
 506         if (!execute("pon [[%provider%]]", ifd, exec)) {
 507                 return 0;
 508         }
 509         return 1;
 510 }
 511
 512 static int ppp_down(interface_defn *ifd, execfn *exec)
 513 {
 514         if (!execute("poff [[%provider%]]", ifd, exec)) {
 515                 return 0;
 516         }
 517         return 1;
 518 }
 519
 520 static int wvdial_up(interface_defn *ifd, execfn *exec)
 521 {
 522         if (!execute("/sbin/start-stop-daemon --start -x /usr/bin/wvdial -p /var/run/wvdial.%iface% -b -m -- [[ %provider% ]]", ifd, exec)) {
 523                 return 0;
 524         }
 525         return 1;
 526 }
 527
 528 static int wvdial_down(interface_defn *ifd, execfn *exec)
 529 {
 530         if (!execute ("/sbin/start-stop-daemon --stop -x /usr/bin/wvdial -p /var/run/wvdial.%iface% -s 2", ifd, exec)) {
 531                 return 0;
 532         }
 533         return 1;
 534 }
 535
 536 static method methods[] = {
 537         { "wvdial", wvdial_up, wvdial_down, },
 538         { "ppp", ppp_up, ppp_down, },
 539         { "static", static_up, static_down, },
 540         { "bootp", bootp_up, bootp_down, },
 541         { "dhcp", dhcp_up, dhcp_down, },
 542         { "loopback", loopback_up, loopback_down, },
 543 };
 544
 545 address_family addr_inet = {
 546         "inet",
 547         sizeof(methods) / sizeof(struct method),
 548         methods
 549 };
 550
 551 #endif  /* ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 */
 552
 553 static char *next_word(char *buf, char *word, int maxlen)
 554 {
 555         if (!buf)
 556                 return NULL;
 557         if (!*buf)
 558                 return NULL;
 559
 560         while (!isspace(*buf) && *buf) {
 561                 if (maxlen-- > 1)
 562                         *word++ = *buf;
 563                 buf++;
 564         }
 565         if (maxlen > 0) {
 566                 *word = '\0';
 567         }
 568
 569         while (isspace(*buf) && *buf) {
 570                 buf++;
 571         }
 572
 573         return buf;
 574 }
 575
 576 static address_family *get_address_family(address_family *af[], char *name)
 577 {
 578         int i;
 579
 580         for (i = 0; af[i]; i++) {
 581                 if (strcmp(af[i]->name, name) == 0) {
 582                         return af[i];
 583                 }
 584         }
 585         return NULL;
 586 }
 587
 588 static method *get_method(address_family *af, char *name)
 589 {
 590         int i;
 591
 592         for (i = 0; i < af->n_methods; i++) {
 593                 if (strcmp(af->method[i].name, name) == 0) {
 594                         return &af->method[i];
 595                 }
 596         }
 597         return(NULL);
 598 }
 599
 600 static int duplicate_if(interface_defn *ifa, interface_defn *ifb)
 601 {
 602         if (strcmp(ifa->iface, ifb->iface) != 0) {
 603                 return(0);
 604         }
 605         if (ifa->address_family != ifb->address_family) {
 606                 return(0);
 607         }
 608         return(1);
 609 }
 610
 611 static int get_line(char **result, size_t * result_len, FILE * f, int *line)
 612 {
 613         size_t pos;
 614
 615         do {
 616                 pos = 0;
 617                 do {
 618                         if (*result_len - pos < 10) {
 619                                 char *newstr = xrealloc(*result, *result_len * 2 + 80);
 620                                 *result = newstr;
 621                                 *result_len = *result_len * 2 + 80;
 622                         }
 623
 624                         if (!fgets(*result + pos, *result_len - pos, f)) {
 625                                 if (ferror(f) == 0 && pos == 0)
 626                                         return 0;
 627                                 if (ferror(f) != 0)
 628                                         return 0;
 629                         }
 630                         pos += xstrlen(*result + pos);
 631                 } while (pos == *result_len - 1 && (*result)[pos - 1] != '\n');
 632
 633                 if (pos != 0 && (*result)[pos - 1] == '\n') {
 634                         (*result)[--pos] = '\0';
 635                 }
 636
 637                 (*line)++;
 638                 {
 639                         int first = 0;
 640
 641                         while (isspace((*result)[first]) && (*result)[first]) {
 642                                 first++;
 643                         }
 644
 645                         memmove(*result, *result + first, pos - first + 1);
 646                         pos -= first;
 647                 }
 648         } while ((*result)[0] == '#');
 649
 650         while ((*result)[pos - 1] == '\\') {
 651                 (*result)[--pos] = '\0';
 652                 do {
 653                         if (*result_len - pos < 10) {
 654                                 char *newstr = xrealloc(*result, *result_len * 2 + 80);
 655                                 *result = newstr;
 656                                 *result_len = *result_len * 2 + 80;
 657                         }
 658
 659                         if (!fgets(*result + pos, *result_len - pos, f)) {
 660                                 if (ferror(f) == 0 && pos == 0)
 661                                         return 0;
 662                                 if (ferror(f) != 0)
 663                                         return 0;
 664                         }
 665                         pos += xstrlen(*result + pos);
 666                 } while (pos == *result_len - 1 && (*result)[pos - 1] != '\n');
 667
 668                 if (pos != 0 && (*result)[pos - 1] == '\n') {
 669                         (*result)[--pos] = '\0';
 670                 }
 671                 (*line)++;
 672         }
 673
 674         while (isspace((*result)[pos - 1])) {   /* remove trailing whitespace */
 675                 pos--;
 676         }
 677         (*result)[pos] = '\0';
 678
 679         return 1;
 680 }
 681
 682 static interfaces_file *read_interfaces(char *filename)
 683 {
 684         interface_defn *currif = NULL;
 685         interfaces_file *defn;
 686 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 687         mapping_defn *currmap = NULL;
 688 #endif
 689         FILE *f;
 690         char firstword[80];
 691         char *buf = NULL;
 692         char *rest;
 693         int line;
 694         size_t buf_len = 0;
 695
 696         enum { NONE, IFACE, MAPPING } currently_processing = NONE;
 697
 698         defn = xmalloc(sizeof(interfaces_file));
 699         defn->max_autointerfaces = defn->n_autointerfaces = 0;
 700         defn->autointerfaces = NULL;
 701 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 702         defn->mappings = NULL;
 703 #endif
 704         defn->ifaces = NULL;
 705         f = fopen(filename, "r");
 706         if (f == NULL) {
 707                 return NULL;
 708         }
 709         line = 0;
 710
 711         while (get_line(&buf, &buf_len, f, &line)) {
 712                 rest = next_word(buf, firstword, 80);
 713                 if (rest == NULL) {
 714                         continue;       /* blank line */
 715                 }
 716
 717                 if (strcmp(firstword, "mapping") == 0) {
 718 #if 0
 719                         currmap = xmalloc(sizeof(mapping_defn));
 720                         currmap->max_matches = 0;
 721                         currmap->n_matches = 0;
 722                         currmap->match = NULL;
 723
 724                         while ((rest = next_word(rest, firstword, 80))) {
 725                                 if (currmap->max_matches == currmap->n_matches) {
 726                                         currmap->max_matches = currmap->max_matches * 2 + 1;
 727                                         currmap->match = xrealloc(currmap->match, sizeof(currmap->match) * currmap->max_matches);
 728                                 }
 729
 730                                 currmap->match[currmap->n_matches++] = xstrdup(firstword);
 731                         }
 732                         currmap->max_mappings = 0;
 733                         currmap->n_mappings = 0;
 734                         currmap->mapping = NULL;
 735                         currmap->script = NULL;
 736                         {
 737                                 mapping_defn **where = &defn->mappings;
 738                                 while (*where != NULL) {
 739                                         where = &(*where)->next;
 740                                 }
 741                                 *where = currmap;
 742                                 currmap->next = NULL;
 743                         }
 744                         currently_processing = MAPPING;
 745 #endif
 746                 } else if (strcmp(firstword, "iface") == 0) {
 747                         {
 748                                 char iface_name[80];
 749                                 char address_family_name[80];
 750                                 char method_name[80];
 751                                 address_family *addr_fams[] = {
 752 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
 753                                         &addr_inet,
 754 #endif
 755 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
 756                                         &addr_inet6,
 757 #endif
 758 #ifdef CONFIG_FEATURE_IFUPDOWN_IPX
 759                                         &addr_ipx,
 760 #endif
 761                                         NULL
 762                                 };
 763
 764                                 currif = xmalloc(sizeof(interface_defn));
 765
 766                                 rest = next_word(rest, iface_name, 80);
 767                                 rest = next_word(rest, address_family_name, 80);
 768                                 rest = next_word(rest, method_name, 80);
 769
 770                                 if (rest == NULL) {
 771                                         error_msg("%s:%d: too few parameters for iface line", filename, line);
 772                                         return NULL;
 773                                 }
 774
 775                                 if (rest[0] != '\0') {
 776                                         error_msg("%s:%d: too many parameters for iface line", filename, line);
 777                                         return NULL;
 778                                 }
 779
 780                                 currif->iface = xstrdup(iface_name);
 781
 782                                 currif->address_family = get_address_family(addr_fams, address_family_name);
 783                                 if (!currif->address_family) {
 784                                         error_msg("%s:%d: unknown address type", filename, line);
 785                                         return NULL;
 786                                 }
 787
 788                                 currif->method = get_method(currif->address_family, method_name);
 789                                 if (!currif->method) {
 790                                         error_msg("%s:%d: unknown method", filename, line);
 791                                         return NULL;
 792                                 }
 793
 794                                 currif->automatic = 1;
 795                                 currif->max_options = 0;
 796                                 currif->n_options = 0;
 797                                 currif->option = NULL;
 798
 799
 800                                 {
 801                                         interface_defn **where = &defn->ifaces;
 802
 803                                         while (*where != NULL) {
 804                                                 if (duplicate_if(*where, currif)) {
 805                                                         error_msg("%s:%d: duplicate interface", filename, line);
 806                                                         return NULL;
 807                                                 }
 808                                                 where = &(*where)->next;
 809                                         }
 810
 811                                         *where = currif;
 812                                         currif->next = NULL;
 813                                 }
 814                         }
 815                         currently_processing = IFACE;
 816                 } else if (strcmp(firstword, "auto") == 0) {
 817                         while ((rest = next_word(rest, firstword, 80))) {
 818                                 int i;
 819
 820                                 for (i = 0; i < defn->n_autointerfaces; i++) {
 821                                         if (strcmp(firstword, defn->autointerfaces[i]) == 0) {
 822                                                 perror_msg("%s:%d: interface declared auto twice", filename, line);
 823                                                 return NULL;
 824                                         }
 825                                 }
 826
 827                                 if (defn->n_autointerfaces == defn->max_autointerfaces) {
 828                                         char **tmp;
 829
 830                                         defn->max_autointerfaces *= 2;
 831                                         defn->max_autointerfaces++;
 832                                         tmp = xrealloc(defn->autointerfaces, sizeof(*tmp) * defn->max_autointerfaces);
 833                                         defn->autointerfaces = tmp;
 834                                 }
 835
 836                                 defn->autointerfaces[defn->n_autointerfaces] = xstrdup(firstword);
 837                                 defn->n_autointerfaces++;
 838                         }
 839                         currently_processing = NONE;
 840                 } else {
 841                         switch (currently_processing) {
 842                         case IFACE:
 843                         {
 844                                 int i;
 845
 846                                 if (xstrlen(rest) == 0) {
 847                                         error_msg("%s:%d: option with empty value", filename, line);
 848                                         return NULL;
 849                                 }
 850
 851                                 if (strcmp(firstword, "up") != 0
 852                                         && strcmp(firstword, "down") != 0
 853                                         && strcmp(firstword, "pre-up") != 0
 854                                         && strcmp(firstword, "post-down") != 0) {
 855                                         for (i = 0; i < currif->n_options; i++) {
 856                                                 if (strcmp(currif->option[i].name, firstword) == 0) {
 857                                                         error_msg("%s:%d: duplicate option", filename, line);
 858                                                         return NULL;
 859                                                 }
 860                                         }
 861                                 }
 862                         }
 863                                 if (currif->n_options >= currif->max_options) {
 864                                         variable *opt;
 865
 866                                         currif->max_options = currif->max_options + 10;
 867                                         opt = xrealloc(currif->option, sizeof(*opt) * currif->max_options);
 868                                         currif->option = opt;
 869                                 }
 870                                 currif->option[currif->n_options].name = xstrdup(firstword);
 871                                 currif->option[currif->n_options].value = xstrdup(rest);
 872                                 if (!currif->option[currif->n_options].name) {
 873                                         perror(filename);
 874                                         return NULL;
 875                                 }
 876                                 if (!currif->option[currif->n_options].value) {
 877                                         perror(filename);
 878                                         return NULL;
 879                                 }
 880                                 currif->n_options++;
 881                                 break;
 882                         case MAPPING:
 883 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 884                                 if (strcmp(firstword, "script") == 0) {
 885                                         if (currmap->script != NULL) {
 886                                                 error_msg("%s:%d: duplicate script in mapping", filename, line);
 887                                                 return NULL;
 888                                         } else {
 889                                                 currmap->script = xstrdup(rest);
 890                                         }
 891                                 } else if (strcmp(firstword, "map") == 0) {
 892                                         if (currmap->max_mappings == currmap->n_mappings) {
 893                                                 currmap->max_mappings = currmap->max_mappings * 2 + 1;
 894                                                 currmap->mapping = xrealloc(currmap->mapping, sizeof(char *) * currmap->max_mappings);
 895                                         }
 896                                         currmap->mapping[currmap->n_mappings] = xstrdup(rest);
 897                                         currmap->n_mappings++;
 898                                 } else {
 899                                         error_msg("%s:%d: misplaced option", filename, line);
 900                                         return NULL;
 901                                 }
 902 #endif
 903                                 break;
 904                         case NONE:
 905                         default:
 906                                 error_msg("%s:%d: misplaced option", filename, line);
 907                                 return NULL;
 908                         }
 909                 }
 910         }
 911         if (ferror(f) != 0) {
 912                 perror_msg("%s", filename);
 913                 return NULL;
 914         }
 915         fclose(f);
 916         line = -1;
 917
 918         return defn;
 919 }
 920
 921 static int check(char *str)
 922 {
 923         return (str != NULL);
 924 }
 925
 926 static char *setlocalenv(char *format, char *name, char *value)
 927 {
 928         char *result;
 929         char *here;
 930         char *there;
 931
 932         result = xmalloc(xstrlen(format) + xstrlen(name) + xstrlen(value) + 1);
 933
 934         sprintf(result, format, name, value);
 935
 936         for (here = there = result; *there != '=' && *there; there++) {
 937                 if (*there == '-')
 938                         *there = '_';
 939                 if (isalpha(*there))
 940                         *there = toupper(*there);
 941
 942                 if (isalnum(*there) || *there == '_') {
 943                         *here = *there;
 944                         here++;
 945                 }
 946         }
 947         memmove(here, there, xstrlen(there) + 1);
 948
 949         return result;
 950 }
 951
 952 static void set_environ(interface_defn *iface, char *mode)
 953 {
 954         char **environend;
 955         int i;
 956         const int n_env_entries = iface->n_options + 5;
 957         char **ppch;
 958
 959         if (environ != NULL) {
 960                 for (ppch = environ; *ppch; ppch++) {
 961                         free(*ppch);
 962                         *ppch = NULL;
 963                 }
 964                 free(environ);
 965                 environ = NULL;
 966         }
 967         environ = xmalloc(sizeof(char *) * (n_env_entries + 1 /* for final NULL */ ));
 968         environend = environ;
 969         *environend = NULL;
 970
 971         for (i = 0; i < iface->n_options; i++) {
 972                 if (strcmp(iface->option[i].name, "up") == 0
 973                         || strcmp(iface->option[i].name, "down") == 0
 974                         || strcmp(iface->option[i].name, "pre-up") == 0
 975                         || strcmp(iface->option[i].name, "post-down") == 0) {
 976                         continue;
 977                 }
 978                 *(environend++) = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value);
 979                 *environend = NULL;
 980         }
 981
 982         *(environend++) = setlocalenv("%s=%s", "IFACE", iface->iface);
 983         *environend = NULL;
 984         *(environend++) = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name);
 985         *environend = NULL;
 986         *(environend++) = setlocalenv("%s=%s", "METHOD", iface->method->name);
 987         *environend = NULL;
 988         *(environend++) = setlocalenv("%s=%s", "MODE", mode);
 989         *environend = NULL;
 990         *(environend++) = setlocalenv("%s=%s", "PATH", "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin");
 991         *environend = NULL;
 992 }
 993
 994 static int doit(char *str)
 995 {
 996         if (verbose || no_act) {
 997                 error_msg("%s", str);
 998         }
 999         if (!no_act) {
1000                 pid_t child;
1001                 int status;
1002
1003                 fflush(NULL);
1004                 switch (child = fork()) {
1005                 case -1:                /* failure */
1006                         return 0;
1007                 case 0:         /* child */
1008                         execle("/bin/sh", "/bin/sh", "-c", str, NULL, environ);
1009                         exit(127);
1010                 default:                /* parent */
1011                 }
1012                 waitpid(child, &status, 0);
1013                 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
1014                         return 0;
1015                 }
1016         }
1017         return (1);
1018 }
1019
1020 static int execute_all(interface_defn *ifd, execfn *exec, char *opt)
1021 {
1022         int i;
1023         char buf[100];
1024
1025         for (i = 0; i < ifd->n_options; i++) {
1026                 if (strcmp(ifd->option[i].name, opt) == 0) {
1027                         if (!(*exec) (ifd->option[i].value)) {
1028                                 return 0;
1029                         }
1030                 }
1031         }
1032
1033         sprintf(buf, "run-parts /etc/network/if-%s.d", opt);
1034         (*exec) (buf);
1035
1036         return (1);
1037 }
1038
1039 static int iface_up(interface_defn *iface)
1040 {
1041         if (!iface->method->up(iface, check)) {
1042                 return (-1);
1043         }
1044
1045         set_environ(iface, "start");
1046         if (!execute_all(iface, doit, "pre-up")) {
1047                 return (0);
1048         }
1049         if (!iface->method->up(iface, doit)) {
1050                 return (0);
1051         }
1052         if (!execute_all(iface, doit, "up")) {
1053                 return (0);
1054         }
1055
1056         return (1);
1057 }
1058
1059 static int iface_down(interface_defn *iface)
1060 {
1061         if (!iface->method->down(iface, check)) {
1062                 return (-1);
1063         }
1064         set_environ(iface, "stop");
1065         if (!execute_all(iface, doit, "down")) {
1066                 return (0);
1067         }
1068         if (!iface->method->down(iface, doit)) {
1069                 return (0);
1070         }
1071         if (!execute_all(iface, doit, "post-down")) {
1072                 return (0);
1073         }
1074         return (1);
1075 }
1076
1077 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1078 static int popen2(FILE **in, FILE **out, char *command, ...)
1079 {
1080         va_list ap;
1081         char *argv[11] = { command };
1082         int argc;
1083         int infd[2], outfd[2];
1084         pid_t pid;
1085
1086         argc = 1;
1087         va_start(ap, command);
1088         while ((argc < 10) && (argv[argc] = va_arg(ap, char *))) {
1089                 argc++;
1090         }
1091         argv[argc] = NULL;      /* make sure */
1092         va_end(ap);
1093
1094         if (pipe(infd) != 0) {
1095                 return 0;
1096         }
1097
1098         if (pipe(outfd) != 0) {
1099                 close(infd[0]);
1100                 close(infd[1]);
1101                 return 0;
1102         }
1103
1104         fflush(NULL);
1105         switch (pid = fork()) {
1106         case -1:                        /* failure */
1107                 close(infd[0]);
1108                 close(infd[1]);
1109                 close(outfd[0]);
1110                 close(outfd[1]);
1111                 return 0;
1112         case 0:                 /* child */
1113                 dup2(infd[0], 0);
1114                 dup2(outfd[1], 1);
1115                 close(infd[0]);
1116                 close(infd[1]);
1117                 close(outfd[0]);
1118                 close(outfd[1]);
1119                 execvp(command, argv);
1120                 exit(127);
1121         default:                        /* parent */
1122                 *in = fdopen(infd[1], "w");
1123                 *out = fdopen(outfd[0], "r");
1124                 close(infd[0]);
1125                 close(outfd[1]);
1126                 return pid;
1127         }
1128         /* unreached */
1129 }
1130
1131 static int run_mapping(char *physical, char *logical, int len, mapping_defn * map)
1132 {
1133         FILE *in, *out;
1134         int i, status;
1135         pid_t pid;
1136
1137
1138         pid = popen2(&in, &out, map->script, physical, NULL);
1139         if (pid == 0) {
1140                 return 0;
1141         }
1142         for (i = 0; i < map->n_mappings; i++) {
1143                 fprintf(in, "%s\n", map->mapping[i]);
1144         }
1145         fclose(in);
1146         waitpid(pid, &status, 0);
1147         if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
1148                 if (fgets(logical, len, out)) {
1149                         char *pch = logical + xstrlen(logical) - 1;
1150
1151                         while (pch >= logical && isspace(*pch))
1152                                 *(pch--) = '\0';
1153                 }
1154         }
1155         fclose(out);
1156
1157         return 1;
1158 }
1159 #endif /* CONFIG_FEATURE_IFUPDOWN_MAPPING */
1160
1161
1162 static int lookfor_iface(char **ifaces, int n_ifaces, char *iface)
1163 {
1164         int i;
1165
1166         for (i = 0; i < n_ifaces; i++) {
1167                 if (strncmp(iface, ifaces[i], xstrlen(iface)) == 0) {
1168                         if (ifaces[i][xstrlen(iface)] == '=') {
1169                                 return i;
1170                         }
1171                 }
1172         }
1173
1174         return(-1);
1175 }
1176
1177 static void add_to_state(char ***ifaces, int *n_ifaces, int *max_ifaces, char *new_iface)
1178 {
1179         if (*max_ifaces == *n_ifaces) {
1180                 *max_ifaces = (*max_ifaces * 2) + 1;
1181                 *ifaces = xrealloc(*ifaces, sizeof(**ifaces) * *max_ifaces);
1182         }
1183
1184         (*ifaces)[(*n_ifaces)++] = new_iface;
1185 }
1186
1187 extern int ifupdown_main(int argc, char **argv)
1188 {
1189         int (*cmds) (interface_defn *) = NULL;
1190         interfaces_file *defn;
1191         FILE *state_fp = NULL;
1192         char **target_iface = NULL;
1193         char **state = NULL;    /* list of iface=liface */
1194         char *interfaces = "/etc/network/interfaces";
1195         char *statefile = "/etc/network/ifstate";
1196
1197         int do_all = 0;
1198 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1199         int run_mappings = 1;
1200 #endif
1201         int force = 0;
1202         int n_target_ifaces = 0;
1203         int n_state = 0;
1204         int max_state = 0;
1205         int i;
1206
1207         if (applet_name[2] == 'u') {
1208                 /* ifup command */
1209                 cmds = iface_up;
1210         } else {
1211                 /* ifdown command */
1212                 cmds = iface_down;
1213         }
1214
1215         while ((i = getopt(argc, argv, "i:hvnamf")) != -1) {
1216                 switch (i) {
1217                 case 'i':       /* interfaces */
1218                         interfaces = xstrdup(optarg);
1219                         break;
1220                 case 'v':       /* verbose */
1221                         verbose = 1;
1222                         break;
1223                 case 'a':       /* all */
1224                         do_all = 1;
1225                         break;
1226                 case 'n':       /* no-act */
1227                         no_act = 1;
1228                         break;
1229 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1230                 case 'm':       /* no-mappings */
1231                         run_mappings = 0;
1232                         break;
1233 #endif
1234                 case 'f':       /* force */
1235                         force = 1;
1236                         break;
1237                 default:
1238                         show_usage();
1239                         break;
1240                 }
1241         }
1242
1243         if (argc - optind > 0) {
1244                 if (do_all) {
1245                         show_usage();
1246                 }
1247         } else {
1248                 if (!do_all) {
1249                         show_usage();
1250                 }
1251         }
1252
1253         defn = read_interfaces(interfaces);
1254         if (!defn) {
1255                 error_msg_and_die("couldn't read interfaces file \"%s\"", interfaces);
1256         }
1257
1258         state_fp = fopen(statefile, no_act ? "r" : "a+");
1259         if (state_fp == NULL && !no_act) {
1260                 perror_msg_and_die("failed to open statefile %s", statefile);
1261         }
1262
1263         if (state_fp != NULL) {
1264                 char buf[80];
1265                 char *p;
1266
1267                 if (!no_act) {
1268                         int flags;
1269                         struct flock lock;
1270                         const int state_fd = fileno(state_fp);
1271
1272                         flags = fcntl(state_fd, F_GETFD);
1273                         if ((flags < 0) || (fcntl(state_fd, F_SETFD, flags | FD_CLOEXEC) < 0)) {
1274                                 perror_msg_and_die("failed to set FD_CLOEXEC on statefile %s", statefile);
1275                         }
1276
1277                         lock.l_type = F_WRLCK;
1278                         lock.l_whence = SEEK_SET;
1279                         lock.l_start = 0;
1280                         lock.l_len = 0;
1281
1282                         if (fcntl(state_fd, F_SETLKW, &lock) < 0) {
1283                                 perror_msg_and_die("failed to lock statefile %s", statefile);
1284                         }
1285                 }
1286
1287                 rewind(state_fp);
1288                 while ((p = fgets(buf, sizeof buf, state_fp)) != NULL) {
1289                         char *pch;
1290
1291                         pch = buf + xstrlen(buf) - 1;
1292                         while (pch > buf && isspace(*pch)) {
1293                                 pch--;
1294                         }
1295                         *(pch + 1) = '\0';
1296
1297                         pch = buf;
1298                         while (isspace(*pch)) {
1299                                 pch++;
1300                         }
1301
1302                         add_to_state(&state, &n_state, &max_state, xstrdup(pch));
1303                 }
1304         }
1305
1306         if (do_all) {
1307                 if (cmds == iface_up) {
1308                         target_iface = defn->autointerfaces;
1309                         n_target_ifaces = defn->n_autointerfaces;
1310                 } else if (cmds == iface_down) {
1311                         target_iface = state;
1312                         n_target_ifaces = n_state;
1313                 }
1314         } else {
1315                 target_iface = argv + optind;
1316                 n_target_ifaces = argc - optind;
1317         }
1318
1319
1320         for (i = 0; i < n_target_ifaces; i++) {
1321                 interface_defn *currif;
1322                 char iface[80];
1323                 char liface[80];
1324                 char *pch;
1325                 int okay = 0;
1326
1327                 strncpy(iface, target_iface[i], sizeof(iface));
1328                 iface[sizeof(iface) - 1] = '\0';
1329
1330                 if ((pch = strchr(iface, '='))) {
1331                         *pch = '\0';
1332                         strncpy(liface, pch + 1, sizeof(liface));
1333                         liface[sizeof(liface) - 1] = '\0';
1334                 } else {
1335                         strncpy(liface, iface, sizeof(liface));
1336                         liface[sizeof(liface) - 1] = '\0';
1337                 }
1338                 if (!force) {
1339                         int already_up = lookfor_iface(state, n_state, iface);;
1340
1341                         if (cmds == iface_up) {
1342                                 /* ifup */
1343                                 if (already_up != -1) {
1344                                         error_msg("interface %s already configured", iface);
1345                                         continue;
1346                                 }
1347                         } else {
1348                                 /* ifdown */
1349                                 if (already_up == -1) {
1350                                         error_msg("interface %s not configured", iface);
1351                                         continue;
1352                                 }
1353                                 strncpy(liface, strchr(state[already_up], '=') + 1, 80);
1354                                 liface[79] = 0;
1355                         }
1356                 }
1357 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1358                 if ((cmds == iface_up) && run_mappings) {
1359                         mapping_defn *currmap;
1360
1361                         for (currmap = defn->mappings; currmap; currmap = currmap->next) {
1362
1363                                 for (i = 0; i < currmap->n_matches; i++) {
1364                                         if (fnmatch(currmap->match[i], liface, 0) != 0)
1365                                                 continue;
1366                                         if (verbose) {
1367                                                 error_msg("Running mapping script %s on %s", currmap->script, liface);
1368                                         }
1369                                         run_mapping(iface, liface, sizeof(liface), currmap);
1370                                         break;
1371                                 }
1372                         }
1373                 }
1374 #endif
1375
1376                 for (currif = defn->ifaces; currif; currif = currif->next) {
1377                         if (strcmp(liface, currif->iface) == 0) {
1378                                 char *oldiface = currif->iface;
1379
1380                                 okay = 1;
1381
1382                                 currif->iface = iface;
1383
1384                                 if (verbose) {
1385                                         error_msg("Configuring interface %s=%s (%s)", iface, liface, currif->address_family->name);
1386                                 }
1387
1388                                 switch (cmds(currif)) {
1389                                 case -1:
1390                                         printf
1391                                                 ("Don't seem to be have all the variables for %s/%s.\n",
1392                                                  liface, currif->address_family->name);
1393                                         break;
1394                                 case 0:
1395                                         /* this wasn't entirely successful, should it be added to
1396                                          *      the state file?
1397                                          */
1398                                 case 1:
1399                                         /* successful */
1400                                 }
1401                                 currif->iface = oldiface;
1402                         }
1403                 }
1404
1405                 if (!okay && !force) {
1406                         error_msg("Ignoring unknown interface %s=%s.", iface, liface);
1407                 } else {
1408                         int already_up = lookfor_iface(state, n_state, iface);
1409
1410                         if (cmds == iface_up) {
1411                                 char *newiface = xmalloc(xstrlen(iface) + 1 + xstrlen(liface) + 1);
1412                                 sprintf(newiface, "%s=%s", iface, liface);
1413                                 if (already_up == -1) {
1414                                         add_to_state(&state, &n_state, &max_state, newiface);
1415                                 } else {
1416                                         free(state[already_up]);
1417                                         state[already_up] = newiface;
1418                                 }
1419                         } else if (cmds == iface_down) {
1420                                 if (already_up != -1) {
1421                                         state[already_up] = state[--n_state];
1422                                 }
1423                         }
1424                 }
1425                 if (state_fp != NULL && !no_act) {
1426                         if (ftruncate(fileno(state_fp), 0) < 0) {
1427                                 error_msg_and_die("failed to truncate statefile %s: %s", statefile, strerror(errno));
1428                         }
1429
1430                         rewind(state_fp);
1431                         for (i = 0; i < n_state; i++) {
1432                                 fputs(state[i], state_fp);
1433                                 fputc('\n', state_fp);
1434                         }
1435                         fflush(state_fp);
1436                 }
1437         }
1438
1439         if (state_fp != NULL) {
1440                 fclose(state_fp);
1441                 state_fp = NULL;
1442         }
1443
1444         return 0;
1445 }