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 "libbb.h"
  39 //#include "busybox.h"
  40 //#include "config.h"
  41
  42 #define IFUPDOWN_VERSION "0.6.4"
  43
  44 typedef struct interface_defn interface_defn;
  45
  46 typedef int (execfn)(char *command);
  47 typedef int (command_set)(interface_defn *ifd, execfn *e);
  48
  49 typedef struct method {
  50         char *name;
  51         command_set *up;
  52         command_set *down;
  53 } method;
  54
  55 typedef struct address_family {
  56         char *name;
  57         int n_methods;
  58         method *method;
  59 } address_family;
  60
  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
  75 typedef struct variable {
  76         char *name;
  77         char *value;
  78 } variable;
  79
  80 struct interface_defn {
  81         struct interface_defn *next;
  82
  83         char *iface;
  84         address_family *address_family;
  85         method *method;
  86
  87         int automatic;
  88
  89         int max_options;
  90         int n_options;
  91         variable *option;
  92 };
  93
  94 typedef struct interfaces_file {
  95         int max_autointerfaces;
  96         int n_autointerfaces;
  97         char **autointerfaces;
  98
  99         interface_defn *ifaces;
 100         mapping_defn *mappings;
 101 } interfaces_file;
 102
 103 #define MAX_OPT_DEPTH 10
 104 #define EUNBALBRACK 10001
 105 #define EUNDEFVAR   10002
 106 #define MAX_VARNAME    32
 107 #define EUNBALPER   10000
 108
 109 static int no_act = 0;
 110 static int verbose = 0;
 111 static char **environ = NULL;
 112
 113 static void addstr(char **buf, size_t *len, size_t *pos, char *str, size_t str_length)
 114 {
 115         if (*pos + str_length >= *len) {
 116                 char *newbuf;
 117
 118                 newbuf = xrealloc(*buf, *len * 2 + str_length + 1);
 119                 *buf = newbuf;
 120                 *len = *len * 2 + str_length + 1;
 121         }
 122
 123         while (str_length-- >= 1) {
 124                 (*buf)[(*pos)++] = *str;
 125                 str++;
 126         }
 127         (*buf)[*pos] = '\0';
 128 }
 129
 130 static int strncmpz(char *l, char *r, size_t llen)
 131 {
 132         int i = strncmp(l, r, llen);
 133
 134         if (i == 0) {
 135                 return(-r[llen]);
 136         } else {
 137                 return(i);
 138         }
 139 }
 140
 141 static char *get_var(char *id, size_t idlen, interface_defn *ifd)
 142 {
 143         int i;
 144
 145         if (strncmpz(id, "iface", idlen) == 0) {
 146                 return (ifd->iface);
 147         } else {
 148                 for (i = 0; i < ifd->n_options; i++) {
 149                         if (strncmpz(id, ifd->option[i].name, idlen) == 0) {
 150                                 return (ifd->option[i].value);
 151                         }
 152                 }
 153         }
 154
 155         return(NULL);
 156 }
 157
 158 static char *parse(char *command, interface_defn *ifd)
 159 {
 160
 161         char *result = NULL;
 162         size_t pos = 0, len = 0;
 163         size_t old_pos[MAX_OPT_DEPTH] = { 0 };
 164         int okay[MAX_OPT_DEPTH] = { 1 };
 165         int opt_depth = 1;
 166
 167         while (*command) {
 168                 switch (*command) {
 169
 170                 default:
 171                         addstr(&result, &len, &pos, command, 1);
 172                         command++;
 173                         break;
 174                 case '\\':
 175                         if (command[1]) {
 176                                 addstr(&result, &len, &pos, command + 1, 1);
 177                                 command += 2;
 178                         } else {
 179                                 addstr(&result, &len, &pos, command, 1);
 180                                 command++;
 181                         }
 182                         break;
 183                 case '[':
 184                         if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) {
 185                                 old_pos[opt_depth] = pos;
 186                                 okay[opt_depth] = 1;
 187                                 opt_depth++;
 188                                 command += 2;
 189                         } else {
 190                                 addstr(&result, &len, &pos, "[", 1);
 191                                 command++;
 192                         }
 193                         break;
 194                 case ']':
 195                         if (command[1] == ']' && opt_depth > 1) {
 196                                 opt_depth--;
 197                                 if (!okay[opt_depth]) {
 198                                         pos = old_pos[opt_depth];
 199                                         result[pos] = '\0';
 200                                 }
 201                                 command += 2;
 202                         } else {
 203                                 addstr(&result, &len, &pos, "]", 1);
 204                                 command++;
 205                         }
 206                         break;
 207                 case '%':
 208                 {
 209                         char *nextpercent;
 210                         char *varvalue;
 211
 212                         command++;
 213                         nextpercent = strchr(command, '%');
 214                         if (!nextpercent) {
 215                                 errno = EUNBALPER;
 216                                 free(result);
 217                                 return (NULL);
 218                         }
 219
 220                         varvalue = get_var(command, nextpercent - command, ifd);
 221
 222                         if (varvalue) {
 223                                 addstr(&result, &len, &pos, varvalue, xstrlen(varvalue));
 224                         } else {
 225                                 okay[opt_depth - 1] = 0;
 226                         }
 227
 228                         command = nextpercent + 1;
 229                 }
 230                         break;
 231                 }
 232         }
 233
 234         if (opt_depth > 1) {
 235                 errno = EUNBALBRACK;
 236                 free(result);
 237                 return(NULL);
 238         }
 239
 240         if (!okay[0]) {
 241                 errno = EUNDEFVAR;
 242                 free(result);
 243                 return(NULL);
 244         }
 245
 246         return(result);
 247 }
 248
 249 static int execute(char *command, interface_defn *ifd, execfn *exec)
 250 {
 251         char *out;
 252         int ret;
 253
 254         out = parse(command, ifd);
 255         if (!out) {
 256                 return(0);
 257         }
 258
 259         ret = (*exec) (out);
 260
 261         free(out);
 262         return(ret);
 263 }
 264
 265 #ifdef CONFIG_FEATURE_IFUPDOWN_IPX
 266 static int static_up_ipx(interface_defn *ifd, execfn *exec)
 267 {
 268         if (!execute("ipx_interface add %iface% %frame% %netnum%", ifd, exec)) {
 269                 return(0);
 270         }
 271         return(1);
 272 }
 273
 274 static int static_down_ipx(interface_defn *ifd, execfn *exec)
 275 {
 276         if (!execute("ipx_interface del %iface% %frame%", ifd, exec)) {
 277                 return(0);
 278         }
 279         return(1);
 280 }
 281
 282 static int dynamic_up(interface_defn *ifd, execfn *exec)
 283 {
 284         if (!execute("ipx_interface add %iface% %frame%", ifd, exec)) {
 285                 return(0);
 286         }
 287         return(1);
 288 }
 289
 290 static int dynamic_down(interface_defn *ifd, execfn *exec)
 291 {
 292         if (!execute("ipx_interface del %iface% %frame%", ifd, exec)) {
 293                 return(0);
 294         }
 295         return(1);
 296 }
 297
 298 static method methods_ipx[] = {
 299         { "dynamic", dynamic_up, dynamic_down, },
 300         { "static", static_up_ipx, static_down_ipx, },
 301 };
 302
 303 address_family addr_ipx = {
 304         "ipx",
 305         sizeof(methods_ipx) / sizeof(struct method),
 306         methods_ipx
 307 };
 308 #endif /* IFUP_FEATURE_IPX */
 309
 310 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
 311 static int loopback_up6(interface_defn *ifd, execfn *exec)
 312 {
 313         if (!execute("ifconfig %iface% add ::1", ifd, exec)) {
 314                 return(0);
 315         }
 316         return(1);
 317 }
 318
 319 static int loopback_down6(interface_defn *ifd, execfn *exec)
 320 {
 321         if (!execute("ifconfig %iface% del ::1", ifd, exec)) {
 322                 return(0);
 323         }
 324         return(1);
 325 }
 326
 327 static int static_up6(interface_defn *ifd, execfn *exec)
 328 {
 329         if (!execute("ifconfig %iface% [[media %media%]] [[hw %hwaddress%]] [[mtu %mtu%]] up", ifd, exec)) {
 330                 return(0);
 331         }
 332         if (!execute("ifconfig %iface% add %address%/%netmask%", ifd, exec)) {
 333                 return(0);
 334         }
 335         if (!execute("[[ route -A inet6 add ::/0 gw %gateway% ]]", ifd, exec)) {
 336                 return(0);
 337         }
 338         return(1);
 339 }
 340
 341 static int static_down6(interface_defn *ifd, execfn *exec)
 342 {
 343         if (!execute("ifconfig %iface% down", ifd, exec)) {
 344                 return(0);
 345         }
 346         return(1);
 347 }
 348
 349 static int v4tunnel_up(interface_defn *ifd, execfn *exec)
 350 {
 351         if (!execute("ip tunnel add %iface% mode sit remote %endpoint% [[local %local%]] [[ttl %ttl%]]", ifd, exec)) {
 352                 return(0);
 353         }
 354         if (!execute("ip link set %iface% up", ifd, exec)) {
 355                 return(0);
 356         }
 357         if (!execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec)) {
 358                 return(0);
 359         }
 360         if (!execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec)) {
 361                 return(0);
 362         }
 363         return(1);
 364 }
 365
 366 static int v4tunnel_down(interface_defn * ifd, execfn * exec)
 367 {
 368         if (!execute("ip tunnel del %iface%", ifd, exec)) {
 369                 return(0);
 370         }
 371         return(1);
 372 }
 373
 374 static method methods6[] = {
 375         { "v4tunnel", v4tunnel_up, v4tunnel_down, },
 376         { "static", static_up6, static_down6, },
 377         { "loopback", loopback_up6, loopback_down6, },
 378 };
 379
 380 address_family addr_inet6 = {
 381         "inet6",
 382         sizeof(methods6) / sizeof(struct method),
 383         methods6
 384 };
 385 #endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */
 386
 387 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
 388 static int loopback_up(interface_defn *ifd, execfn *exec)
 389 {
 390         if (!execute("ifconfig %iface% 127.0.0.1 up", ifd, exec)) {
 391                 return(0);
 392         }
 393         return(1);
 394 }
 395
 396 static int loopback_down(interface_defn *ifd, execfn *exec)
 397 {
 398         if (!execute("ifconfig %iface% down", ifd, exec)) {
 399                 return(0);
 400         }
 401         return(1);
 402 }
 403
 404 static int static_up(interface_defn *ifd, execfn *exec)
 405 {
 406         if (!execute("ifconfig %iface% %address% netmask %netmask% [[broadcast %broadcast%]]    [[pointopoint %pointopoint%]] [[media %media%]] [[mtu %mtu%]]   [[hw %hwaddress%]] up",
 407                  ifd, exec)) {
 408                 return(0);
 409         }
 410         if (!execute("[[ route add default gw %gateway% %iface% ]]", ifd, exec)) {
 411                 return(0);
 412         }
 413         return(1);
 414 }
 415
 416 static int static_down(interface_defn *ifd, execfn *exec)
 417 {
 418         if (!execute("[[ route del default gw %gateway% %iface% ]]", ifd, exec)) {
 419                 return(0);
 420         }
 421         if (!execute("ifconfig %iface% down", ifd, exec)) {
 422                 return(0);
 423         }
 424         return(1);
 425 }
 426
 427 static int execable(char *program)
 428 {
 429         struct stat buf;
 430         if (0 == stat(program, &buf)) {
 431                 if (S_ISREG(buf.st_mode) && (S_IXUSR & buf.st_mode)) {
 432                         return(1);
 433                 }
 434         }
 435         return(0);
 436 }
 437
 438 static int dhcp_up(interface_defn *ifd, execfn *exec)
 439 {
 440         if (execable("/sbin/dhclient")) {
 441                 if (!execute("dhclient -pf /var/run/dhclient.%iface%.pid %iface%", ifd, exec)) {
 442                         return(0);
 443                 }
 444         } else if (execable("/sbin/pump")) {
 445                 if (!execute("pump -i %iface% [[-h %hostname%]] [[-l %leasehours%]]", ifd, exec)) {
 446                         return(0);
 447                 }
 448         } else if (execable("/sbin/udhcpc")) {
 449                 if (!execute("udhcpc -n -p /var/run/udhcpc.%iface%.pid -i %iface% [[-H %hostname%]] [[-c %clientid%]]", ifd, exec)) {
 450                         return 0;
 451                 }
 452         } else if (execable("/sbin/dhcpcd")) {
 453                 if (!execute("dhcpcd [[-h %hostname%]] [[-i %vendor%]] [[-I %clientid%]] [[-l %leasetime%]] %iface%", ifd, exec)) {
 454                         return(0);
 455                 }
 456         }
 457         return(1);
 458 }
 459
 460 static int dhcp_down(interface_defn *ifd, execfn *exec)
 461 {
 462         if (execable("/sbin/dhclient")) {
 463                 if (!execute("kill -9 `cat /var/run/udhcpc.%iface%.pid`", ifd, exec)) {
 464                         return(0);
 465                 }
 466         } else if (execable("/sbin/pump")) {
 467                 if (!execute("pump -i %iface% -k", ifd, exec)) {
 468                         return(0);
 469                 }
 470         } else if (execable("/sbin/udhcpc")) {
 471                 if (!execute("kill -9 `cat /var/run/udhcpc.%iface%.pid`", ifd, exec)) {
 472                         return(0);
 473                 }
 474         } else if (execable("/sbin/dhcpcd")) {
 475                 if (!execute("dhcpcd -k %iface%", ifd, exec)) {
 476                         return(0);
 477                 }
 478         }
 479         if (!execute("ifconfig %iface% down", ifd, exec)) {
 480                 return(0);
 481         }
 482         return(1);
 483 }
 484
 485 static int bootp_up(interface_defn *ifd, execfn *exec)
 486 {
 487         if (!execute("bootpc [[--bootfile %bootfile%]] --dev %iface% [[--server %server%]]            [[--hwaddr %hwaddr%]] --returniffail --serverbcast", ifd, exec)) {
 488                 return 0;
 489         }
 490         return 1;
 491 }
 492
 493 static int bootp_down(interface_defn *ifd, execfn *exec)
 494 {
 495         if (!execute("ifconfig down %iface%", ifd, exec)) {
 496                 return 0;
 497         }
 498         return 1;
 499 }
 500
 501 static int ppp_up(interface_defn *ifd, execfn *exec)
 502 {
 503         if (!execute("pon [[%provider%]]", ifd, exec)) {
 504                 return 0;
 505         }
 506         return 1;
 507 }
 508
 509 static int ppp_down(interface_defn *ifd, execfn *exec)
 510 {
 511         if (!execute("poff [[%provider%]]", ifd, exec)) {
 512                 return 0;
 513         }
 514         return 1;
 515 }
 516
 517 static int wvdial_up(interface_defn *ifd, execfn *exec)
 518 {
 519         if (!execute("/sbin/start-stop-daemon --start -x /usr/bin/wvdial -p /var/run/wvdial.%iface% -b -m -- [[ %provider% ]]", ifd, exec)) {
 520                 return 0;
 521         }
 522         return 1;
 523 }
 524
 525 static int wvdial_down(interface_defn *ifd, execfn *exec)
 526 {
 527         if (!execute ("/sbin/start-stop-daemon --stop -x /usr/bin/wvdial -p /var/run/wvdial.%iface% -s 2", ifd, exec)) {
 528                 return 0;
 529         }
 530         return 1;
 531 }
 532
 533 static method methods[] = {
 534         { "wvdial", wvdial_up, wvdial_down, },
 535         { "ppp", ppp_up, ppp_down, },
 536         { "static", static_up, static_down, },
 537         { "bootp", bootp_up, bootp_down, },
 538         { "dhcp", dhcp_up, dhcp_down, },
 539         { "loopback", loopback_up, loopback_down, },
 540 };
 541
 542 address_family addr_inet = {
 543         "inet",
 544         sizeof(methods) / sizeof(struct method),
 545         methods
 546 };
 547
 548 #endif  /* ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 */
 549
 550 static char *next_word(char *buf, char *word, int maxlen)
 551 {
 552         if (!buf)
 553                 return NULL;
 554         if (!*buf)
 555                 return NULL;
 556
 557         while (!isspace(*buf) && *buf) {
 558                 if (maxlen-- > 1)
 559                         *word++ = *buf;
 560                 buf++;
 561         }
 562         if (maxlen > 0) {
 563                 *word = '\0';
 564         }
 565
 566         while (isspace(*buf) && *buf) {
 567                 buf++;
 568         }
 569
 570         return buf;
 571 }
 572
 573 static address_family *get_address_family(address_family *af[], char *name)
 574 {
 575         int i;
 576
 577         for (i = 0; af[i]; i++) {
 578                 if (strcmp(af[i]->name, name) == 0) {
 579                         return af[i];
 580                 }
 581         }
 582         return NULL;
 583 }
 584
 585 static method *get_method(address_family *af, char *name)
 586 {
 587         int i;
 588
 589         for (i = 0; i < af->n_methods; i++) {
 590                 if (strcmp(af->method[i].name, name) == 0) {
 591                         return &af->method[i];
 592                 }
 593         }
 594         return(NULL);
 595 }
 596
 597 static int duplicate_if(interface_defn *ifa, interface_defn *ifb)
 598 {
 599         if (strcmp(ifa->iface, ifb->iface) != 0) {
 600                 return(0);
 601         }
 602         if (ifa->address_family != ifb->address_family) {
 603                 return(0);
 604         }
 605         return(1);
 606 }
 607
 608 static int get_line(char **result, size_t * result_len, FILE * f, int *line)
 609 {
 610         size_t pos;
 611
 612         do {
 613                 pos = 0;
 614                 do {
 615                         if (*result_len - pos < 10) {
 616                                 char *newstr = xrealloc(*result, *result_len * 2 + 80);
 617                                 *result = newstr;
 618                                 *result_len = *result_len * 2 + 80;
 619                         }
 620
 621                         if (!fgets(*result + pos, *result_len - pos, f)) {
 622                                 if (ferror(f) == 0 && pos == 0)
 623                                         return 0;
 624                                 if (ferror(f) != 0)
 625                                         return 0;
 626                         }
 627                         pos += xstrlen(*result + pos);
 628                 } while (pos == *result_len - 1 && (*result)[pos - 1] != '\n');
 629
 630                 if (pos != 0 && (*result)[pos - 1] == '\n') {
 631                         (*result)[--pos] = '\0';
 632                 }
 633
 634                 (*line)++;
 635                 {
 636                         int first = 0;
 637
 638                         while (isspace((*result)[first]) && (*result)[first]) {
 639                                 first++;
 640                         }
 641
 642                         memmove(*result, *result + first, pos - first + 1);
 643                         pos -= first;
 644                 }
 645         } while ((*result)[0] == '#');
 646
 647         while ((*result)[pos - 1] == '\\') {
 648                 (*result)[--pos] = '\0';
 649                 do {
 650                         if (*result_len - pos < 10) {
 651                                 char *newstr = xrealloc(*result, *result_len * 2 + 80);
 652                                 *result = newstr;
 653                                 *result_len = *result_len * 2 + 80;
 654                         }
 655
 656                         if (!fgets(*result + pos, *result_len - pos, f)) {
 657                                 if (ferror(f) == 0 && pos == 0)
 658                                         return 0;
 659                                 if (ferror(f) != 0)
 660                                         return 0;
 661                         }
 662                         pos += xstrlen(*result + pos);
 663                 } while (pos == *result_len - 1 && (*result)[pos - 1] != '\n');
 664
 665                 if (pos != 0 && (*result)[pos - 1] == '\n') {
 666                         (*result)[--pos] = '\0';
 667                 }
 668                 (*line)++;
 669         }
 670
 671         while (isspace((*result)[pos - 1])) {   /* remove trailing whitespace */
 672                 pos--;
 673         }
 674         (*result)[pos] = '\0';
 675
 676         return 1;
 677 }
 678
 679 static interfaces_file *read_interfaces(char *filename)
 680 {
 681         interface_defn *currif = NULL;
 682         interfaces_file *defn;
 683         mapping_defn *currmap = NULL;
 684         FILE *f;
 685         char firstword[80];
 686         char *buf = NULL;
 687         char *rest;
 688         int line;
 689         size_t buf_len = 0;
 690
 691         enum { NONE, IFACE, MAPPING } currently_processing = NONE;
 692
 693         defn = xmalloc(sizeof(interfaces_file));
 694         defn->max_autointerfaces = defn->n_autointerfaces = 0;
 695         defn->autointerfaces = NULL;
 696         defn->mappings = NULL;
 697         defn->ifaces = NULL;
 698         f = fopen(filename, "r");
 699         if (f == NULL) {
 700                 return NULL;
 701         }
 702         line = 0;
 703
 704         while (get_line(&buf, &buf_len, f, &line)) {
 705                 rest = next_word(buf, firstword, 80);
 706                 if (rest == NULL) {
 707                         continue;       /* blank line */
 708                 }
 709
 710                 if (strcmp(firstword, "mapping") == 0) {
 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, const char *opt)
1010 {
1011         int i;
1012         char *buf;
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         buf = xmalloc(xstrlen(opt) + 19);
1023         sprintf(buf, "/etc/network/if-%s.d", opt);
1024         run_parts(&buf, 0);
1025         free(buf);
1026         return (1);
1027 }
1028
1029 static int iface_up(interface_defn *iface)
1030 {
1031         if (!iface->method->up(iface, check)) {
1032                 return (-1);
1033         }
1034
1035         set_environ(iface, "start");
1036         if (!execute_all(iface, doit, "pre-up")) {
1037                 return (0);
1038         }
1039         if (!iface->method->up(iface, doit)) {
1040                 return (0);
1041         }
1042         if (!execute_all(iface, doit, "up")) {
1043                 return (0);
1044         }
1045
1046         return (1);
1047 }
1048
1049 static int iface_down(interface_defn *iface)
1050 {
1051         if (!iface->method->down(iface, check)) {
1052                 return (-1);
1053         }
1054         set_environ(iface, "stop");
1055         if (!execute_all(iface, doit, "down")) {
1056                 return (0);
1057         }
1058         if (!iface->method->down(iface, doit)) {
1059                 return (0);
1060         }
1061         if (!execute_all(iface, doit, "post-down")) {
1062                 return (0);
1063         }
1064         return (1);
1065 }
1066
1067 static int popen2(FILE **in, FILE **out, char *command, ...)
1068 {
1069         va_list ap;
1070         char *argv[11] = { command };
1071         int argc;
1072         int infd[2], outfd[2];
1073         pid_t pid;
1074
1075         argc = 1;
1076         va_start(ap, command);
1077         while ((argc < 10) && (argv[argc] = va_arg(ap, char *))) {
1078                 argc++;
1079         }
1080         argv[argc] = NULL;      /* make sure */
1081         va_end(ap);
1082
1083         if (pipe(infd) != 0) {
1084                 return 0;
1085         }
1086
1087         if (pipe(outfd) != 0) {
1088                 close(infd[0]);
1089                 close(infd[1]);
1090                 return 0;
1091         }
1092
1093         fflush(NULL);
1094         switch (pid = fork()) {
1095         case -1:                        /* failure */
1096                 close(infd[0]);
1097                 close(infd[1]);
1098                 close(outfd[0]);
1099                 close(outfd[1]);
1100                 return 0;
1101         case 0:                 /* child */
1102                 dup2(infd[0], 0);
1103                 dup2(outfd[1], 1);
1104                 close(infd[0]);
1105                 close(infd[1]);
1106                 close(outfd[0]);
1107                 close(outfd[1]);
1108                 execvp(command, argv);
1109                 exit(127);
1110         default:                        /* parent */
1111                 *in = fdopen(infd[1], "w");
1112                 *out = fdopen(outfd[0], "r");
1113                 close(infd[0]);
1114                 close(outfd[1]);
1115                 return pid;
1116         }
1117         /* unreached */
1118 }
1119
1120 static int run_mapping(char *physical, char *logical, int len, mapping_defn * map)
1121 {
1122         FILE *in, *out;
1123         int i, status;
1124         pid_t pid;
1125
1126
1127         pid = popen2(&in, &out, map->script, physical, NULL);
1128         if (pid == 0) {
1129                 return 0;
1130         }
1131         for (i = 0; i < map->n_mappings; i++) {
1132                 fprintf(in, "%s\n", map->mapping[i]);
1133         }
1134         fclose(in);
1135         waitpid(pid, &status, 0);
1136         if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
1137                 if (fgets(logical, len, out)) {
1138                         char *pch = logical + xstrlen(logical) - 1;
1139
1140                         while (pch >= logical && isspace(*pch))
1141                                 *(pch--) = '\0';
1142                 }
1143         }
1144         fclose(out);
1145
1146         return 1;
1147 }
1148
1149
1150 static int lookfor_iface(char **ifaces, int n_ifaces, char *iface)
1151 {
1152         int i;
1153
1154         for (i = 0; i < n_ifaces; i++) {
1155                 if (strncmp(iface, ifaces[i], xstrlen(iface)) == 0) {
1156                         if (ifaces[i][xstrlen(iface)] == '=') {
1157                                 return i;
1158                         }
1159                 }
1160         }
1161
1162         return(-1);
1163 }
1164
1165 static void add_to_state(char ***ifaces, int *n_ifaces, int *max_ifaces, char *new_iface)
1166 {
1167         if (*max_ifaces == *n_ifaces) {
1168                 *max_ifaces = (*max_ifaces * 2) + 1;
1169                 *ifaces = xrealloc(*ifaces, sizeof(**ifaces) * *max_ifaces);
1170         }
1171
1172         (*ifaces)[(*n_ifaces)++] = new_iface;
1173 }
1174
1175 extern int ifupdown_main(int argc, char **argv)
1176 {
1177         int (*cmds) (interface_defn *) = NULL;
1178         interfaces_file *defn;
1179         FILE *state_fp = NULL;
1180         char **target_iface = NULL;
1181         char **state = NULL;    /* list of iface=liface */
1182         char *interfaces = "/etc/network/interfaces";
1183         char *statefile = "/etc/network/ifstate";
1184
1185         int do_all = 0;
1186         int run_mappings = 1;
1187         int force = 0;
1188         int n_target_ifaces = 0;
1189         int n_state = 0;
1190         int max_state = 0;
1191         int i;
1192
1193         if (applet_name[2] == 'u') {
1194                 /* ifup command */
1195                 cmds = iface_up;
1196         } else {
1197                 /* ifdown command */
1198                 cmds = iface_down;
1199         }
1200
1201         while ((i = getopt(argc, argv, "i:hvnamf")) != -1) {
1202                 switch (i) {
1203                 case 'i':       /* interfaces */
1204                         interfaces = xstrdup(optarg);
1205                         break;
1206                 case 'v':       /* verbose */
1207                         verbose = 1;
1208                         break;
1209                 case 'a':       /* all */
1210                         do_all = 1;
1211                         break;
1212                 case 'n':       /* no-act */
1213                         no_act = 1;
1214                         break;
1215                 case 'm':       /* no-mappings */
1216                         run_mappings = 0;
1217                         break;
1218                 case 'f':       /* force */
1219                         force = 1;
1220                         break;
1221                 default:
1222                         show_usage();
1223                         break;
1224                 }
1225         }
1226
1227         if (argc - optind > 0) {
1228                 if (do_all) {
1229                         show_usage();
1230                 }
1231         } else {
1232                 if (!do_all) {
1233                         show_usage();
1234                 }
1235         }
1236
1237         defn = read_interfaces(interfaces);
1238         if (!defn) {
1239                 error_msg_and_die("couldn't read interfaces file \"%s\"", interfaces);
1240         }
1241
1242         state_fp = fopen(statefile, no_act ? "r" : "a+");
1243         if (state_fp == NULL && !no_act) {
1244                 perror_msg_and_die("failed to open statefile %s", statefile);
1245         }
1246
1247         if (state_fp != NULL) {
1248                 char buf[80];
1249                 char *p;
1250
1251                 if (!no_act) {
1252                         int flags;
1253                         struct flock lock;
1254                         const int state_fd = fileno(state_fp);
1255
1256                         flags = fcntl(state_fd, F_GETFD);
1257                         if ((flags < 0) || (fcntl(state_fd, F_SETFD, flags | FD_CLOEXEC) < 0)) {
1258                                 perror_msg_and_die("failed to set FD_CLOEXEC on statefile %s", statefile);
1259                         }
1260
1261                         lock.l_type = F_WRLCK;
1262                         lock.l_whence = SEEK_SET;
1263                         lock.l_start = 0;
1264                         lock.l_len = 0;
1265
1266                         if (fcntl(state_fd, F_SETLKW, &lock) < 0) {
1267                                 perror_msg_and_die("failed to lock statefile %s", statefile);
1268                         }
1269                 }
1270
1271                 rewind(state_fp);
1272                 while ((p = fgets(buf, sizeof buf, state_fp)) != NULL) {
1273                         char *pch;
1274
1275                         pch = buf + xstrlen(buf) - 1;
1276                         while (pch > buf && isspace(*pch)) {
1277                                 pch--;
1278                         }
1279                         *(pch + 1) = '\0';
1280
1281                         pch = buf;
1282                         while (isspace(*pch)) {
1283                                 pch++;
1284                         }
1285
1286                         add_to_state(&state, &n_state, &max_state, xstrdup(pch));
1287                 }
1288         }
1289
1290         if (do_all) {
1291                 if (cmds == iface_up) {
1292                         target_iface = defn->autointerfaces;
1293                         n_target_ifaces = defn->n_autointerfaces;
1294                 } else if (cmds == iface_down) {
1295                         target_iface = state;
1296                         n_target_ifaces = n_state;
1297                 }
1298         } else {
1299                 target_iface = argv + optind;
1300                 n_target_ifaces = argc - optind;
1301         }
1302
1303
1304         for (i = 0; i < n_target_ifaces; i++) {
1305                 interface_defn *currif;
1306                 char iface[80];
1307                 char liface[80];
1308                 char *pch;
1309                 int okay = 0;
1310
1311                 strncpy(iface, target_iface[i], sizeof(iface));
1312                 iface[sizeof(iface) - 1] = '\0';
1313
1314                 if ((pch = strchr(iface, '='))) {
1315                         *pch = '\0';
1316                         strncpy(liface, pch + 1, sizeof(liface));
1317                         liface[sizeof(liface) - 1] = '\0';
1318                 } else {
1319                         strncpy(liface, iface, sizeof(liface));
1320                         liface[sizeof(liface) - 1] = '\0';
1321                 }
1322                 if (!force) {
1323                         int already_up = lookfor_iface(state, n_state, iface);;
1324
1325                         if (cmds == iface_up) {
1326                                 /* ifup */
1327                                 if (already_up != -1) {
1328                                         error_msg("interface %s already configured", iface);
1329                                         continue;
1330                                 }
1331                         } else {
1332                                 /* ifdown */
1333                                 if (already_up == -1) {
1334                                         error_msg("interface %s not configured", iface);
1335                                         continue;
1336                                 }
1337                                 strncpy(liface, strchr(state[already_up], '=') + 1, 80);
1338                                 liface[79] = 0;
1339                         }
1340                 }
1341                 if ((cmds == iface_up) && run_mappings) {
1342                         mapping_defn *currmap;
1343
1344                         for (currmap = defn->mappings; currmap; currmap = currmap->next) {
1345
1346                                 for (i = 0; i < currmap->n_matches; i++) {
1347                                         if (fnmatch(currmap->match[i], liface, 0) != 0)
1348                                                 continue;
1349                                         if (verbose) {
1350                                                 error_msg("Running mapping script %s on %s", currmap->script, liface);
1351                                         }
1352                                         run_mapping(iface, liface, sizeof(liface), currmap);
1353                                         break;
1354                                 }
1355                         }
1356                 }
1357
1358                 for (currif = defn->ifaces; currif; currif = currif->next) {
1359                         if (strcmp(liface, currif->iface) == 0) {
1360                                 char *oldiface = currif->iface;
1361
1362                                 okay = 1;
1363
1364                                 currif->iface = iface;
1365
1366                                 if (verbose) {
1367                                         error_msg("Configuring interface %s=%s (%s)", iface, liface, currif->address_family->name);
1368                                 }
1369
1370                                 switch (cmds(currif)) {
1371                                 case -1:
1372                                         printf
1373                                                 ("Don't seem to be have all the variables for %s/%s.\n",
1374                                                  liface, currif->address_family->name);
1375                                         break;
1376                                 case 0:
1377                                         /* this wasn't entirely successful, should it be added to
1378                                          *      the state file?
1379                                          */
1380                                 case 1:
1381                                         /* successful */
1382                                 }
1383                                 currif->iface = oldiface;
1384                         }
1385                 }
1386
1387                 if (!okay && !force) {
1388                         error_msg("Ignoring unknown interface %s=%s.", iface, liface);
1389                 } else {
1390                         int already_up = lookfor_iface(state, n_state, iface);
1391
1392                         if (cmds == iface_up) {
1393                                 char *newiface = xmalloc(xstrlen(iface) + 1 + xstrlen(liface) + 1);
1394                                 sprintf(newiface, "%s=%s", iface, liface);
1395                                 if (already_up == -1) {
1396                                         add_to_state(&state, &n_state, &max_state, newiface);
1397                                 } else {
1398                                         free(state[already_up]);
1399                                         state[already_up] = newiface;
1400                                 }
1401                         } else if (cmds == iface_down) {
1402                                 if (already_up != -1) {
1403                                         state[already_up] = state[--n_state];
1404                                 }
1405                         }
1406                 }
1407                 if (state_fp != NULL && !no_act) {
1408                         if (ftruncate(fileno(state_fp), 0) < 0) {
1409                                 error_msg_and_die("failed to truncate statefile %s: %s", statefile, strerror(errno));
1410                         }
1411
1412                         rewind(state_fp);
1413                         for (i = 0; i < n_state; i++) {
1414                                 fputs(state[i], state_fp);
1415                                 fputc('\n', state_fp);
1416                         }
1417                         fflush(state_fp);
1418                 }
1419         }
1420
1421         if (state_fp != NULL) {
1422                 fclose(state_fp);
1423                 state_fp = NULL;
1424         }
1425
1426         return 0;
1427 }