networking/ifupdown.c

   1 /*
   2  *  ifupdown for busybox
   3  *  Copyright (c) 2002 Glenn McGrath <bug1@optushome.com.au>
   4  *
   5  *  Based on ifupdown v 0.6.4 by Anthony Towns
   6  *  Copyright (c) 1999 Anthony Towns <aj@azure.humbug.org.au>
   7  *
   8  *  Changes to upstream version
   9  *  Remove checks for kernel version, assume kernel version 2.2.0 or better.
  10  *  Lines in the interfaces file cannot wrap.
  11  *  To adhere to the FHS, the default state file is /var/run/ifstate.
  12  *
  13  *  This program is free software; you can redistribute it and/or modify
  14  *  it under the terms of the GNU General Public License as published by
  15  *  the Free Software Foundation; either version 2 of the License, or
  16  *  (at your option) any later version.
  17  *
  18  *  This program is distributed in the hope that it will be useful,
  19  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *  GNU General Public License for more details.
  22  *
  23  *  You should have received a copy of the GNU General Public License
  24  *  along with this program; if not, write to the Free Software
  25  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26  */
  27
  28 #include <sys/stat.h>
  29 #include <sys/utsname.h>
  30 #include <sys/wait.h>
  31
  32 #include <ctype.h>
  33 #include <errno.h>
  34 #include <fcntl.h>
  35 #include <fnmatch.h>
  36 #include <getopt.h>
  37 #include <stdarg.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <unistd.h>
  42
  43 #include "libbb.h"
  44
  45 #define MAX_OPT_DEPTH 10
  46 #define EUNBALBRACK 10001
  47 #define EUNDEFVAR   10002
  48 #define EUNBALPER   10000
  49
  50 typedef struct interface_defn_s interface_defn_t;
  51
  52 typedef int (execfn)(char *command);
  53 typedef int (command_set)(interface_defn_t *ifd, execfn *e);
  54
  55 typedef struct method_s {
  56         char *name;
  57         command_set *up;
  58         command_set *down;
  59 } method_t;
  60
  61 typedef struct address_family_s {
  62         char *name;
  63         int n_methods;
  64         method_t *method;
  65 } address_family_t;
  66
  67 typedef struct mapping_defn_s {
  68         struct mapping_defn_s *next;
  69
  70         int max_matches;
  71         int n_matches;
  72         char **match;
  73
  74         char *script;
  75
  76         int max_mappings;
  77         int n_mappings;
  78         char **mapping;
  79 } mapping_defn_t;
  80
  81 typedef struct variable_s {
  82         char *name;
  83         char *value;
  84 } variable_t;
  85
  86 struct interface_defn_s {
  87         struct interface_defn_s *next;
  88
  89         char *iface;
  90         address_family_t *address_family;
  91         method_t *method;
  92
  93         int automatic;
  94
  95         int max_options;
  96         int n_options;
  97         variable_t *option;
  98 };
  99
 100 typedef struct interfaces_file_s {
 101         llist_t *autointerfaces;
 102         interface_defn_t *ifaces;
 103         mapping_defn_t *mappings;
 104 } interfaces_file_t;
 105
 106 static char no_act = 0;
 107 static char verbose = 0;
 108 static char **environ = NULL;
 109
 110 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 111 static int count_netmask_bits(char *dotted_quad)
 112 {
 113         unsigned int a, b, c, d;
 114         unsigned int res, result;
 115         /* Found a netmask...  Check if it is dotted quad */
 116         if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) != 4)
 117                 return -1;
 118         res = (a & 0x55) + ((a >> 1) & 0x55);
 119         res = (res & 0x33) + ((res >> 2) & 0x33);
 120         result = (res & 0x0F) + ((res >> 4) & 0x0F);
 121
 122         res = (b & 0x55) + ((b >> 1) & 0x55);
 123         res = (res & 0x33) + ((res >> 2) & 0x33);
 124         result += (res & 0x0F) + ((res >> 4) & 0x0F);
 125
 126         res = (c & 0x55) + ((c >> 1) & 0x55);
 127         res = (res & 0x33) + ((res >> 2) & 0x33);
 128         result += (res & 0x0F) + ((res >> 4) & 0x0F);
 129
 130         res = (d & 0x55) + ((d >> 1) & 0x55);
 131         res = (res & 0x33) + ((res >> 2) & 0x33);
 132         result += (res & 0x0F) + ((res >> 4) & 0x0F);
 133         return ((int)result);
 134 }
 135 #endif
 136
 137 static void addstr(char **buf, size_t *len, size_t *pos, char *str, size_t str_length)
 138 {
 139         if (*pos + str_length >= *len) {
 140                 char *newbuf;
 141
 142                 newbuf = xrealloc(*buf, *len * 2 + str_length + 1);
 143                 *buf = newbuf;
 144                 *len = *len * 2 + str_length + 1;
 145         }
 146
 147         while (str_length-- >= 1) {
 148                 (*buf)[(*pos)++] = *str;
 149                 str++;
 150         }
 151         (*buf)[*pos] = '\0';
 152 }
 153
 154 static int strncmpz(char *l, char *r, size_t llen)
 155 {
 156         int i = strncmp(l, r, llen);
 157
 158         if (i == 0) {
 159                 return(-r[llen]);
 160         } else {
 161                 return(i);
 162         }
 163 }
 164
 165 static char *get_var(char *id, size_t idlen, interface_defn_t *ifd)
 166 {
 167         int i;
 168
 169         if (strncmpz(id, "iface", idlen) == 0) {
 170                 return (ifd->iface);
 171         } else {
 172                 for (i = 0; i < ifd->n_options; i++) {
 173                         if (strncmpz(id, ifd->option[i].name, idlen) == 0) {
 174                                 return (ifd->option[i].value);
 175                         }
 176                 }
 177         }
 178
 179         return(NULL);
 180 }
 181
 182 static char *parse(char *command, interface_defn_t *ifd)
 183 {
 184
 185         char *result = NULL;
 186         size_t pos = 0, len = 0;
 187         size_t old_pos[MAX_OPT_DEPTH] = { 0 };
 188         int okay[MAX_OPT_DEPTH] = { 1 };
 189         int opt_depth = 1;
 190
 191         while (*command) {
 192                 switch (*command) {
 193
 194                 default:
 195                         addstr(&result, &len, &pos, command, 1);
 196                         command++;
 197                         break;
 198                 case '\\':
 199                         if (command[1]) {
 200                                 addstr(&result, &len, &pos, command + 1, 1);
 201                                 command += 2;
 202                         } else {
 203                                 addstr(&result, &len, &pos, command, 1);
 204                                 command++;
 205                         }
 206                         break;
 207                 case '[':
 208                         if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) {
 209                                 old_pos[opt_depth] = pos;
 210                                 okay[opt_depth] = 1;
 211                                 opt_depth++;
 212                                 command += 2;
 213                         } else {
 214                                 addstr(&result, &len, &pos, "[", 1);
 215                                 command++;
 216                         }
 217                         break;
 218                 case ']':
 219                         if (command[1] == ']' && opt_depth > 1) {
 220                                 opt_depth--;
 221                                 if (!okay[opt_depth]) {
 222                                         pos = old_pos[opt_depth];
 223                                         result[pos] = '\0';
 224                                 }
 225                                 command += 2;
 226                         } else {
 227                                 addstr(&result, &len, &pos, "]", 1);
 228                                 command++;
 229                         }
 230                         break;
 231                 case '%':
 232                 {
 233                         char *nextpercent;
 234                         char *varvalue;
 235
 236                         command++;
 237                         nextpercent = strchr(command, '%');
 238                         if (!nextpercent) {
 239                                 errno = EUNBALPER;
 240                                 free(result);
 241                                 return (NULL);
 242                         }
 243
 244                         varvalue = get_var(command, nextpercent - command, ifd);
 245
 246                         if (varvalue) {
 247                                 addstr(&result, &len, &pos, varvalue, xstrlen(varvalue));
 248                         } else {
 249 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 250                                 /* Sigh...  Add a special case for 'ip' to convert from
 251                                  * dotted quad to bit count style netmasks.  */
 252                                 if (strncmp(command, "bnmask", 6)==0) {
 253                                         int res;
 254                                         varvalue = get_var("netmask", 7, ifd);
 255                                         if (varvalue && (res=count_netmask_bits(varvalue)) > 0) {
 256                                                 char argument[255];
 257                                                 sprintf(argument, "%d", res);
 258                                                 addstr(&result, &len, &pos, argument, xstrlen(argument));
 259                                                 command = nextpercent + 1;
 260                                                 break;
 261                                         }
 262                                 }
 263 #endif
 264                                 okay[opt_depth - 1] = 0;
 265                         }
 266
 267                         command = nextpercent + 1;
 268                 }
 269                         break;
 270                 }
 271         }
 272
 273         if (opt_depth > 1) {
 274                 errno = EUNBALBRACK;
 275                 free(result);
 276                 return(NULL);
 277         }
 278
 279         if (!okay[0]) {
 280                 errno = EUNDEFVAR;
 281                 free(result);
 282                 return(NULL);
 283         }
 284
 285         return(result);
 286 }
 287
 288 static int execute(char *command, interface_defn_t *ifd, execfn *exec)
 289 {
 290         char *out;
 291         int ret;
 292
 293         out = parse(command, ifd);
 294         if (!out) {
 295                 return(0);
 296         }
 297
 298         ret = (*exec) (out);
 299
 300         free(out);
 301         return(ret);
 302 }
 303
 304 #ifdef CONFIG_FEATURE_IFUPDOWN_IPX
 305 static int static_up_ipx(interface_defn_t *ifd, execfn *exec)
 306 {
 307         if (!execute("ipx_interface add %iface% %frame% %netnum%", ifd, exec)) {
 308                 return(0);
 309         }
 310         return(1);
 311 }
 312
 313 static int static_down_ipx(interface_defn_t *ifd, execfn *exec)
 314 {
 315         if (!execute("ipx_interface del %iface% %frame%", ifd, exec)) {
 316                 return(0);
 317         }
 318         return(1);
 319 }
 320
 321 static int dynamic_up(interface_defn_t *ifd, execfn *exec)
 322 {
 323         if (!execute("ipx_interface add %iface% %frame%", ifd, exec)) {
 324                 return(0);
 325         }
 326         return(1);
 327 }
 328
 329 static int dynamic_down(interface_defn_t *ifd, execfn *exec)
 330 {
 331         if (!execute("ipx_interface del %iface% %frame%", ifd, exec)) {
 332                 return(0);
 333         }
 334         return(1);
 335 }
 336
 337 static method_t methods_ipx[] = {
 338         { "dynamic", dynamic_up, dynamic_down, },
 339         { "static", static_up_ipx, static_down_ipx, },
 340 };
 341
 342 address_family_t addr_ipx = {
 343         "ipx",
 344         sizeof(methods_ipx) / sizeof(method_t),
 345         methods_ipx
 346 };
 347 #endif /* IFUP_FEATURE_IPX */
 348
 349 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
 350 static int loopback_up6(interface_defn_t *ifd, execfn *exec)
 351 {
 352 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 353         if (!execute("ip link set %iface% up", ifd, exec))
 354                 return(0);
 355         if (!execute("ip addr add ::1 dev %iface%", ifd, exec))
 356                 return(0);
 357 #else
 358         if (!execute("ifconfig %iface% add ::1", ifd, exec))
 359                 return(0);
 360 #endif
 361         return(1);
 362 }
 363
 364 static int loopback_down6(interface_defn_t *ifd, execfn *exec)
 365 {
 366 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 367         if (!execute("ip link set %iface% down", ifd, exec))
 368                 return(0);
 369 #else
 370         if (!execute("ifconfig %iface% del ::1", ifd, exec))
 371                 return(0);
 372 #endif
 373         return(1);
 374 }
 375
 376 static int static_up6(interface_defn_t *ifd, execfn *exec)
 377 {
 378 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 379         if (!execute("ip link set %iface% up", ifd, exec))
 380                 return(0);
 381         if (!execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec))
 382                 return(0);
 383         if (!execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec))
 384                 return(0);
 385 #else
 386         if (!execute("ifconfig %iface% [[media %media%]] [[hw %hwaddress%]] [[mtu %mtu%]] up", ifd, exec)) {
 387                 return(0);
 388         }
 389         if (!execute("ifconfig %iface% add %address%/%netmask%", ifd, exec)) {
 390                 return(0);
 391         }
 392         if (!execute("[[ route -A inet6 add ::/0 gw %gateway% ]]", ifd, exec)) {
 393                 return(0);
 394         }
 395 #endif
 396         return(1);
 397 }
 398
 399 static int static_down6(interface_defn_t *ifd, execfn *exec)
 400 {
 401 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 402         if (!execute("ip link set %iface% down", ifd, exec))
 403                 return(0);
 404 #else
 405         if (!execute("ifconfig %iface% down", ifd, exec)) {
 406                 return(0);
 407         }
 408 #endif
 409         return(1);
 410 }
 411
 412 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 413 static int v4tunnel_up(interface_defn_t *ifd, execfn *exec)
 414 {
 415         if (!execute("ip tunnel add %iface% mode sit remote %endpoint% [[local %local%]] [[ttl %ttl%]]", ifd, exec)) {
 416                 return(0);
 417         }
 418         if (!execute("ip link set %iface% up", ifd, exec)) {
 419                 return(0);
 420         }
 421         if (!execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec)) {
 422                 return(0);
 423         }
 424         if (!execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec)) {
 425                 return(0);
 426         }
 427         return(1);
 428 }
 429
 430 static int v4tunnel_down(interface_defn_t * ifd, execfn * exec)
 431 {
 432         if (!execute("ip tunnel del %iface%", ifd, exec)) {
 433                 return(0);
 434         }
 435         return(1);
 436 }
 437 #endif
 438
 439 static method_t methods6[] = {
 440 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 441         { "v4tunnel", v4tunnel_up, v4tunnel_down, },
 442 #endif
 443         { "static", static_up6, static_down6, },
 444         { "loopback", loopback_up6, loopback_down6, },
 445 };
 446
 447 address_family_t addr_inet6 = {
 448         "inet6",
 449         sizeof(methods6) / sizeof(method_t),
 450         methods6
 451 };
 452 #endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */
 453
 454 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
 455 static int loopback_up(interface_defn_t *ifd, execfn *exec)
 456 {
 457 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 458         if (!execute("ip link set %iface% up", ifd, exec))
 459                 return(0);
 460         if (!execute("ip addr add 127.0.0.1 dev %iface%", ifd, exec))
 461                 return(0);
 462 #else
 463         if (!execute("ifconfig %iface% 127.0.0.1 up", ifd, exec)) {
 464                 return(0);
 465         }
 466 #endif
 467         return(1);
 468 }
 469
 470 static int loopback_down(interface_defn_t *ifd, execfn *exec)
 471 {
 472 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 473         if (!execute("ip addr flush dev %iface%", ifd, exec))
 474                 return(0);
 475         if (!execute("ip link set %iface% down", ifd, exec))
 476                 return(0);
 477 #else
 478         if (!execute("ifconfig %iface% 127.0.0.1 down", ifd, exec)) {
 479                 return(0);
 480         }
 481 #endif
 482         return(1);
 483 }
 484
 485 static int static_up(interface_defn_t *ifd, execfn *exec)
 486 {
 487 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 488         if (!execute("ip link set %iface% up", ifd, exec))
 489                 return(0);
 490         if (!execute("ip addr add %address%/%bnmask% dev %iface%", ifd, exec))
 491                 return(0);
 492         if (!execute("[[ ip route add default via %gateway% dev %iface% ]]", ifd, exec))
 493                 return(0);
 494 #else
 495         if (!execute("ifconfig %iface% %address% netmask %netmask% [[broadcast %broadcast%]]    [[pointopoint %pointopoint%]] [[media %media%]] [[mtu %mtu%]]   [[hw %hwaddress%]] up",
 496                  ifd, exec)) {
 497                 return(0);
 498         }
 499         if (!execute("[[ route add default gw %gateway% %iface% ]]", ifd, exec)) {
 500                 return(0);
 501         }
 502 #endif
 503         return(1);
 504 }
 505
 506 static int static_down(interface_defn_t *ifd, execfn *exec)
 507 {
 508 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
 509         //if (!execute("[[ ip route del default via %gateway% dev %iface% ]]", ifd, exec))
 510         //      return(0);
 511         if (!execute("ip addr flush dev %iface%", ifd, exec))
 512                 return(0);
 513         if (!execute("ip link set %iface% down", ifd, exec))
 514                 return(0);
 515 #else
 516         if (!execute("[[ route del default gw %gateway% %iface% ]]", ifd, exec)) {
 517                 return(0);
 518         }
 519         if (!execute("ifconfig %iface% down", ifd, exec)) {
 520                 return(0);
 521         }
 522 #endif
 523         return(1);
 524 }
 525
 526 static int execable(char *program)
 527 {
 528         struct stat buf;
 529         if (0 == stat(program, &buf)) {
 530                 if (S_ISREG(buf.st_mode) && (S_IXUSR & buf.st_mode)) {
 531                         return(1);
 532                 }
 533         }
 534         return(0);
 535 }
 536
 537 static int dhcp_up(interface_defn_t *ifd, execfn *exec)
 538 {
 539         if (execable("/sbin/dhclient")) {
 540                 if (!execute("dhclient -pf /var/run/dhclient.%iface%.pid %iface%", ifd, exec)) {
 541                         return(0);
 542                 }
 543         } else if (execable("/sbin/pump")) {
 544                 if (!execute("pump -i %iface% [[-h %hostname%]] [[-l %leasehours%]]", ifd, exec)) {
 545                         return(0);
 546                 }
 547         } else if (execable("/sbin/udhcpc")) {
 548                 if (!execute("udhcpc -n -p /var/run/udhcpc.%iface%.pid -i %iface% [[-H %hostname%]] [[-c %clientid%]]", ifd, exec)) {
 549                         return 0;
 550                 }
 551         } else if (execable("/sbin/dhcpcd")) {
 552                 if (!execute("dhcpcd [[-h %hostname%]] [[-i %vendor%]] [[-I %clientid%]] [[-l %leasetime%]] %iface%", ifd, exec)) {
 553                         return(0);
 554                 }
 555         }
 556         return(1);
 557 }
 558
 559 static int dhcp_down(interface_defn_t *ifd, execfn *exec)
 560 {
 561         if (execable("/sbin/dhclient")) {
 562                 if (!execute("kill -9 `cat /var/run/udhcpc.%iface%.pid`", ifd, exec)) {
 563                         return(0);
 564                 }
 565         } else if (execable("/sbin/pump")) {
 566                 if (!execute("pump -i %iface% -k", ifd, exec)) {
 567                         return(0);
 568                 }
 569         } else if (execable("/sbin/udhcpc")) {
 570                 if (!execute("kill -9 `cat /var/run/udhcpc.%iface%.pid`", ifd, exec)) {
 571                         return(0);
 572                 }
 573         } else if (execable("/sbin/dhcpcd")) {
 574                 if (!execute("dhcpcd -k %iface%", ifd, exec)) {
 575                         return(0);
 576                 }
 577         }
 578         if (!execute("ifconfig %iface% down", ifd, exec)) {
 579                 return(0);
 580         }
 581         return(1);
 582 }
 583
 584 static int bootp_up(interface_defn_t *ifd, execfn *exec)
 585 {
 586         if (!execute("bootpc [[--bootfile %bootfile%]] --dev %iface% [[--server %server%]]            [[--hwaddr %hwaddr%]] --returniffail --serverbcast", ifd, exec)) {
 587                 return 0;
 588         }
 589         return 1;
 590 }
 591
 592 static int bootp_down(interface_defn_t *ifd, execfn *exec)
 593 {
 594         if (!execute("ifconfig down %iface%", ifd, exec)) {
 595                 return 0;
 596         }
 597         return 1;
 598 }
 599
 600 static int ppp_up(interface_defn_t *ifd, execfn *exec)
 601 {
 602         if (!execute("pon [[%provider%]]", ifd, exec)) {
 603                 return 0;
 604         }
 605         return 1;
 606 }
 607
 608 static int ppp_down(interface_defn_t *ifd, execfn *exec)
 609 {
 610         if (!execute("poff [[%provider%]]", ifd, exec)) {
 611                 return 0;
 612         }
 613         return 1;
 614 }
 615
 616 static int wvdial_up(interface_defn_t *ifd, execfn *exec)
 617 {
 618         if (!execute("/sbin/start-stop-daemon --start -x /usr/bin/wvdial -p /var/run/wvdial.%iface% -b -m -- [[ %provider% ]]", ifd, exec)) {
 619                 return 0;
 620         }
 621         return 1;
 622 }
 623
 624 static int wvdial_down(interface_defn_t *ifd, execfn *exec)
 625 {
 626         if (!execute ("/sbin/start-stop-daemon --stop -x /usr/bin/wvdial -p /var/run/wvdial.%iface% -s 2", ifd, exec)) {
 627                 return 0;
 628         }
 629         return 1;
 630 }
 631
 632 static method_t methods[] = {
 633         { "wvdial", wvdial_up, wvdial_down, },
 634         { "ppp", ppp_up, ppp_down, },
 635         { "static", static_up, static_down, },
 636         { "bootp", bootp_up, bootp_down, },
 637         { "dhcp", dhcp_up, dhcp_down, },
 638         { "loopback", loopback_up, loopback_down, },
 639 };
 640
 641 address_family_t addr_inet = {
 642         "inet",
 643         sizeof(methods) / sizeof(method_t),
 644         methods
 645 };
 646
 647 #endif  /* ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 */
 648
 649 static char *next_word(char **buf)
 650 {
 651         unsigned short length;
 652         char *word;
 653
 654         if ((buf == NULL) || (*buf == NULL) || (**buf == '\0')) {
 655                 return NULL;
 656         }
 657
 658         /* Skip over leading whitespace */
 659         word = *buf + strspn(*buf, " \t\n");
 660
 661         /* Find the length of this word */
 662         length = strcspn(word, " \t\n");
 663         if (length == 0) {
 664                 return(NULL);
 665         }
 666         *buf = word + length;
 667         **buf = '\0';
 668         (*buf)++;
 669
 670         return word;
 671 }
 672
 673 static address_family_t *get_address_family(address_family_t *af[], char *name)
 674 {
 675         int i;
 676
 677         for (i = 0; af[i]; i++) {
 678                 if (strcmp(af[i]->name, name) == 0) {
 679                         return af[i];
 680                 }
 681         }
 682         return NULL;
 683 }
 684
 685 static method_t *get_method(address_family_t *af, char *name)
 686 {
 687         int i;
 688
 689         for (i = 0; i < af->n_methods; i++) {
 690                 if (strcmp(af->method[i].name, name) == 0) {
 691                         return &af->method[i];
 692                 }
 693         }
 694         return(NULL);
 695 }
 696
 697 static int duplicate_if(interface_defn_t *ifa, interface_defn_t *ifb)
 698 {
 699         if (strcmp(ifa->iface, ifb->iface) != 0) {
 700                 return(0);
 701         }
 702         if (ifa->address_family != ifb->address_family) {
 703                 return(0);
 704         }
 705         return(1);
 706 }
 707
 708 static const llist_t *find_list_string(const llist_t *list, const char *string)
 709 {
 710         while (list) {
 711                 if (strcmp(list->data, string) == 0) {
 712                         return(list);
 713                 }
 714                 list = list->link;
 715         }
 716         return(NULL);
 717 }
 718
 719 static interfaces_file_t *read_interfaces(char *filename)
 720 {
 721 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 722         mapping_defn_t *currmap = NULL;
 723 #endif
 724         interface_defn_t *currif = NULL;
 725         interfaces_file_t *defn;
 726         FILE *f;
 727         char *firstword;
 728         char *buf;
 729
 730         enum { NONE, IFACE, MAPPING } currently_processing = NONE;
 731
 732         defn = xmalloc(sizeof(interfaces_file_t));
 733         defn->autointerfaces = NULL;
 734         defn->mappings = NULL;
 735         defn->ifaces = NULL;
 736
 737         f = xfopen(filename, "r");
 738
 739         while ((buf = get_line_from_file(f)) != NULL) {
 740                 char *buf_ptr = buf;
 741
 742                 /* Ignore comments */
 743                 if (buf[0] == '#') {
 744                         continue;
 745                 }
 746
 747                 firstword = next_word(&buf_ptr);
 748                 if (firstword == NULL) {
 749                         continue;       /* blank line */
 750                 }
 751
 752                 if (strcmp(firstword, "mapping") == 0) {
 753 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 754                         currmap = xmalloc(sizeof(mapping_defn_t));
 755                         currmap->max_matches = 0;
 756                         currmap->n_matches = 0;
 757                         currmap->match = NULL;
 758
 759                         while ((firstword = next_word(&buf_ptr)) != NULL) {
 760                                 if (currmap->max_matches == currmap->n_matches) {
 761                                         currmap->max_matches = currmap->max_matches * 2 + 1;
 762                                         currmap->match = xrealloc(currmap->match, sizeof(currmap->match) * currmap->max_matches);
 763                                 }
 764
 765                                 currmap->match[currmap->n_matches++] = xstrdup(firstword);
 766                         }
 767                         currmap->max_mappings = 0;
 768                         currmap->n_mappings = 0;
 769                         currmap->mapping = NULL;
 770                         currmap->script = NULL;
 771                         {
 772                                 mapping_defn_t **where = &defn->mappings;
 773                                 while (*where != NULL) {
 774                                         where = &(*where)->next;
 775                                 }
 776                                 *where = currmap;
 777                                 currmap->next = NULL;
 778                         }
 779 #endif
 780                         currently_processing = MAPPING;
 781                 } else if (strcmp(firstword, "iface") == 0) {
 782                         {
 783                                 char *iface_name;
 784                                 char *address_family_name;
 785                                 char *method_name;
 786                                 address_family_t *addr_fams[] = {
 787 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
 788                                         &addr_inet,
 789 #endif
 790 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
 791                                         &addr_inet6,
 792 #endif
 793 #ifdef CONFIG_FEATURE_IFUPDOWN_IPX
 794                                         &addr_ipx,
 795 #endif
 796                                         NULL
 797                                 };
 798
 799                                 currif = xmalloc(sizeof(interface_defn_t));
 800                                 iface_name = next_word(&buf_ptr);
 801                                 address_family_name = next_word(&buf_ptr);
 802                                 method_name = next_word(&buf_ptr);
 803
 804                                 if (buf_ptr == NULL) {
 805                                         error_msg("too few parameters for line \"%s\"", buf);
 806                                         return NULL;
 807                                 }
 808
 809                                 if (buf_ptr[0] != '\0') {
 810                                         error_msg("too many parameters \"%s\"", buf);
 811                                         return NULL;
 812                                 }
 813
 814                                 currif->iface = xstrdup(iface_name);
 815
 816                                 currif->address_family = get_address_family(addr_fams, address_family_name);
 817                                 if (!currif->address_family) {
 818                                         error_msg("unknown address type \"%s\"", buf);
 819                                         return NULL;
 820                                 }
 821
 822                                 currif->method = get_method(currif->address_family, method_name);
 823                                 if (!currif->method) {
 824                                         error_msg("unknown method \"%s\"", buf);
 825                                         return NULL;
 826                                 }
 827
 828                                 currif->automatic = 1;
 829                                 currif->max_options = 0;
 830                                 currif->n_options = 0;
 831                                 currif->option = NULL;
 832
 833
 834                                 {
 835                                         interface_defn_t **where = &defn->ifaces;
 836
 837                                         while (*where != NULL) {
 838                                                 if (duplicate_if(*where, currif)) {
 839                                                         error_msg("duplicate interface \"%s\"", buf);
 840                                                         return NULL;
 841                                                 }
 842                                                 where = &(*where)->next;
 843                                         }
 844
 845                                         *where = currif;
 846                                         currif->next = NULL;
 847                                 }
 848                         }
 849                         currently_processing = IFACE;
 850                 } else if (strcmp(firstword, "auto") == 0) {
 851                         while ((firstword = next_word(&buf_ptr)) != NULL) {
 852
 853                                 /* Check the interface isnt already listed */
 854                                 if (find_list_string(defn->autointerfaces, firstword)) {
 855                                         perror_msg_and_die("interface declared auto twice \"%s\"", buf);
 856                                 }
 857
 858                                 /* Add the interface to the list */
 859                                 defn->autointerfaces = llist_add_to(defn->autointerfaces, strdup(firstword));
 860                         }
 861                         currently_processing = NONE;
 862                 } else {
 863                         switch (currently_processing) {
 864                         case IFACE:
 865                         {
 866                                 int i;
 867
 868                                 if (xstrlen(buf_ptr) == 0) {
 869                                         error_msg("option with empty value \"%s\"", buf);
 870                                         return NULL;
 871                                 }
 872
 873                                 if (strcmp(firstword, "up") != 0
 874                                         && strcmp(firstword, "down") != 0
 875                                         && strcmp(firstword, "pre-up") != 0
 876                                         && strcmp(firstword, "post-down") != 0) {
 877                                         for (i = 0; i < currif->n_options; i++) {
 878                                                 if (strcmp(currif->option[i].name, firstword) == 0) {
 879                                                         error_msg("duplicate option \"%s\"", buf);
 880                                                         return NULL;
 881                                                 }
 882                                         }
 883                                 }
 884                         }
 885                                 if (currif->n_options >= currif->max_options) {
 886                                         variable_t *opt;
 887
 888                                         currif->max_options = currif->max_options + 10;
 889                                         opt = xrealloc(currif->option, sizeof(*opt) * currif->max_options);
 890                                         currif->option = opt;
 891                                 }
 892                                 currif->option[currif->n_options].name = xstrdup(firstword);
 893                                 currif->option[currif->n_options].value = xstrdup(next_word(&buf_ptr));
 894                                 if (!currif->option[currif->n_options].name) {
 895                                         perror(filename);
 896                                         return NULL;
 897                                 }
 898                                 if (!currif->option[currif->n_options].value) {
 899                                         perror(filename);
 900                                         return NULL;
 901                                 }
 902                                 currif->n_options++;
 903                                 break;
 904                         case MAPPING:
 905 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
 906                                 if (strcmp(firstword, "script") == 0) {
 907                                         if (currmap->script != NULL) {
 908                                                 error_msg("duplicate script in mapping \"%s\"", buf);
 909                                                 return NULL;
 910                                         } else {
 911                                                 currmap->script = xstrdup(next_word(&buf_ptr));
 912                                         }
 913                                 } else if (strcmp(firstword, "map") == 0) {
 914                                         if (currmap->max_mappings == currmap->n_mappings) {
 915                                                 currmap->max_mappings = currmap->max_mappings * 2 + 1;
 916                                                 currmap->mapping = xrealloc(currmap->mapping, sizeof(char *) * currmap->max_mappings);
 917                                         }
 918                                         currmap->mapping[currmap->n_mappings] = xstrdup(next_word(&buf_ptr));
 919                                         currmap->n_mappings++;
 920                                 } else {
 921                                         error_msg("misplaced option \"%s\"", buf);
 922                                         return NULL;
 923                                 }
 924 #endif
 925                                 break;
 926                         case NONE:
 927                         default:
 928                                 error_msg("misplaced option \"%s\"", buf);
 929                                 return NULL;
 930                         }
 931                 }
 932                 free(buf);
 933         }
 934         if (ferror(f) != 0) {
 935                 perror_msg_and_die("%s", filename);
 936         }
 937         fclose(f);
 938
 939         return defn;
 940 }
 941
 942 static char *setlocalenv(char *format, char *name, char *value)
 943 {
 944         char *result;
 945         char *here;
 946         char *there;
 947
 948         result = xmalloc(xstrlen(format) + xstrlen(name) + xstrlen(value) + 1);
 949
 950         sprintf(result, format, name, value);
 951
 952         for (here = there = result; *there != '=' && *there; there++) {
 953                 if (*there == '-')
 954                         *there = '_';
 955                 if (isalpha(*there))
 956                         *there = toupper(*there);
 957
 958                 if (isalnum(*there) || *there == '_') {
 959                         *here = *there;
 960                         here++;
 961                 }
 962         }
 963         memmove(here, there, xstrlen(there) + 1);
 964
 965         return result;
 966 }
 967
 968 static void set_environ(interface_defn_t *iface, char *mode)
 969 {
 970         char **environend;
 971         int i;
 972         const int n_env_entries = iface->n_options + 5;
 973         char **ppch;
 974
 975         if (environ != NULL) {
 976                 for (ppch = environ; *ppch; ppch++) {
 977                         free(*ppch);
 978                         *ppch = NULL;
 979                 }
 980                 free(environ);
 981                 environ = NULL;
 982         }
 983         environ = xmalloc(sizeof(char *) * (n_env_entries + 1 /* for final NULL */ ));
 984         environend = environ;
 985         *environend = NULL;
 986
 987         for (i = 0; i < iface->n_options; i++) {
 988                 if (strcmp(iface->option[i].name, "up") == 0
 989                         || strcmp(iface->option[i].name, "down") == 0
 990                         || strcmp(iface->option[i].name, "pre-up") == 0
 991                         || strcmp(iface->option[i].name, "post-down") == 0) {
 992                         continue;
 993                 }
 994                 *(environend++) = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value);
 995                 *environend = NULL;
 996         }
 997
 998         *(environend++) = setlocalenv("%s=%s", "IFACE", iface->iface);
 999         *environend = NULL;
1000         *(environend++) = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name);
1001         *environend = NULL;
1002         *(environend++) = setlocalenv("%s=%s", "METHOD", iface->method->name);
1003         *environend = NULL;
1004         *(environend++) = setlocalenv("%s=%s", "MODE", mode);
1005         *environend = NULL;
1006         *(environend++) = setlocalenv("%s=%s", "PATH", "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin");
1007         *environend = NULL;
1008 }
1009
1010 static int doit(char *str)
1011 {
1012         if (verbose || no_act) {
1013                 error_msg("%s", str);
1014         }
1015         if (!no_act) {
1016                 pid_t child;
1017                 int status;
1018
1019                 fflush(NULL);
1020                 switch (child = fork()) {
1021                 case -1:                /* failure */
1022                         return 0;
1023                 case 0:         /* child */
1024                         execle("/bin/sh", "/bin/sh", "-c", str, NULL, environ);
1025                         exit(127);
1026                 }
1027                 waitpid(child, &status, 0);
1028                 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
1029                         return 0;
1030                 }
1031         }
1032         return (1);
1033 }
1034
1035 static int execute_all(interface_defn_t *ifd, execfn *exec, const char *opt)
1036 {
1037         int i;
1038         char *buf;
1039
1040         for (i = 0; i < ifd->n_options; i++) {
1041                 if (strcmp(ifd->option[i].name, opt) == 0) {
1042                         if (!(*exec) (ifd->option[i].value)) {
1043                                 return 0;
1044                         }
1045                 }
1046         }
1047
1048         buf = xmalloc(xstrlen(opt) + 19);
1049         sprintf(buf, "/etc/network/if-%s.d", opt);
1050         run_parts(&buf, 2);
1051         free(buf);
1052         return (1);
1053 }
1054
1055 static int iface_up(interface_defn_t *iface)
1056 {
1057         set_environ(iface, "start");
1058         if (!execute_all(iface, doit, "pre-up")) {
1059                 return (0);
1060         }
1061         if (!iface->method->up(iface, doit)) {
1062                 return (0);
1063         }
1064         if (!execute_all(iface, doit, "up")) {
1065                 return (0);
1066         }
1067
1068         return (1);
1069 }
1070
1071 static int iface_down(interface_defn_t *iface)
1072 {
1073         set_environ(iface, "stop");
1074         if (!execute_all(iface, doit, "down")) {
1075                 return (0);
1076         }
1077         if (!iface->method->down(iface, doit)) {
1078                 return (0);
1079         }
1080         if (!execute_all(iface, doit, "post-down")) {
1081                 return (0);
1082         }
1083         return (1);
1084 }
1085
1086 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1087 static int popen2(FILE **in, FILE **out, char *command, ...)
1088 {
1089         va_list ap;
1090         char *argv[11] = { command };
1091         int argc;
1092         int infd[2], outfd[2];
1093         pid_t pid;
1094
1095         argc = 1;
1096         va_start(ap, command);
1097         while ((argc < 10) && (argv[argc] = va_arg(ap, char *))) {
1098                 argc++;
1099         }
1100         argv[argc] = NULL;      /* make sure */
1101         va_end(ap);
1102
1103         if (pipe(infd) != 0) {
1104                 return 0;
1105         }
1106
1107         if (pipe(outfd) != 0) {
1108                 close(infd[0]);
1109                 close(infd[1]);
1110                 return 0;
1111         }
1112
1113         fflush(NULL);
1114         switch (pid = fork()) {
1115         case -1:                        /* failure */
1116                 close(infd[0]);
1117                 close(infd[1]);
1118                 close(outfd[0]);
1119                 close(outfd[1]);
1120                 return 0;
1121         case 0:                 /* child */
1122                 dup2(infd[0], 0);
1123                 dup2(outfd[1], 1);
1124                 close(infd[0]);
1125                 close(infd[1]);
1126                 close(outfd[0]);
1127                 close(outfd[1]);
1128                 execvp(command, argv);
1129                 exit(127);
1130         default:                        /* parent */
1131                 *in = fdopen(infd[1], "w");
1132                 *out = fdopen(outfd[0], "r");
1133                 close(infd[0]);
1134                 close(outfd[1]);
1135                 return pid;
1136         }
1137         /* unreached */
1138 }
1139
1140 static int run_mapping(char *physical, char *logical, int len, mapping_defn_t * map)
1141 {
1142         FILE *in, *out;
1143         int i, status;
1144         pid_t pid;
1145
1146
1147         pid = popen2(&in, &out, map->script, physical, NULL);
1148         if (pid == 0) {
1149                 return 0;
1150         }
1151         for (i = 0; i < map->n_mappings; i++) {
1152                 fprintf(in, "%s\n", map->mapping[i]);
1153         }
1154         fclose(in);
1155         waitpid(pid, &status, 0);
1156         if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
1157                 if (fgets(logical, len, out)) {
1158                         char *pch = logical + xstrlen(logical) - 1;
1159
1160                         while (pch >= logical && isspace(*pch))
1161                                 *(pch--) = '\0';
1162                 }
1163         }
1164         fclose(out);
1165
1166         return 1;
1167 }
1168 #endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */
1169
1170 static llist_t *find_iface_state(llist_t *state_list, const char *iface)
1171 {
1172         unsigned short iface_len = xstrlen(iface);
1173         llist_t *search = state_list;
1174
1175         while (search) {
1176                 if ((strncmp(search->data, iface, iface_len) == 0) &&
1177                         (search->data[iface_len] == '=')) {
1178                         return(search);
1179                 }
1180                 search = search->link;
1181         }
1182         return(NULL);
1183 }
1184
1185 extern int ifupdown_main(int argc, char **argv)
1186 {
1187         int (*cmds) (interface_defn_t *) = NULL;
1188         interfaces_file_t *defn;
1189         FILE *state_fp = NULL;
1190         llist_t *state_list = NULL;
1191         llist_t *target_list = NULL;
1192         char *interfaces = "/etc/network/interfaces";
1193         const char *statefile = "/var/run/ifstate";
1194
1195 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1196         int run_mappings = 1;
1197 #endif
1198         int do_all = 0;
1199         int force = 0;
1200         int i;
1201
1202         if (applet_name[2] == 'u') {
1203                 /* ifup command */
1204                 cmds = iface_up;
1205         } else {
1206                 /* ifdown command */
1207                 cmds = iface_down;
1208         }
1209
1210 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1211         while ((i = getopt(argc, argv, "i:hvnamf")) != -1) {
1212 #else
1213         while ((i = getopt(argc, argv, "i:hvnaf")) != -1) {
1214 #endif
1215                 switch (i) {
1216                 case 'i':       /* interfaces */
1217                         interfaces = xstrdup(optarg);
1218                         break;
1219                 case 'v':       /* verbose */
1220                         verbose = 1;
1221                         break;
1222                 case 'a':       /* all */
1223                         do_all = 1;
1224                         break;
1225                 case 'n':       /* no-act */
1226                         no_act = 1;
1227                         break;
1228 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1229                 case 'm':       /* no-mappings */
1230                         run_mappings = 0;
1231                         break;
1232 #endif
1233                 case 'f':       /* force */
1234                         force = 1;
1235                         break;
1236                 default:
1237                         show_usage();
1238                         break;
1239                 }
1240         }
1241
1242         if (argc - optind > 0) {
1243                 if (do_all) {
1244                         show_usage();
1245                 }
1246         } else {
1247                 if (!do_all) {
1248                         show_usage();
1249                 }
1250         }
1251
1252         defn = read_interfaces(interfaces);
1253
1254         if (no_act) {
1255                 state_fp = fopen(statefile, "r");
1256         }
1257
1258         /* Create a list of interfaces to work on */
1259         if (do_all) {
1260                 if (cmds == iface_up) {
1261                         target_list = defn->autointerfaces;
1262                 } else if (cmds == iface_down) {
1263                         const llist_t *list = state_list;
1264                         while (list) {
1265                                 target_list = llist_add_to(target_list, strdup(list->data));
1266                                 list = list->link;
1267                         }
1268                         target_list = defn->autointerfaces;
1269                 }
1270         } else {
1271                 target_list = llist_add_to(target_list, argv[optind]);
1272         }
1273
1274
1275         /* Update the interfaces */
1276         while (target_list) {
1277                 interface_defn_t *currif;
1278                 char *iface;
1279                 char *liface;
1280                 char *pch;
1281                 int okay = 0;
1282
1283                 iface = strdup(target_list->data);
1284                 target_list = target_list->link;
1285
1286                 pch = strchr(iface, '=');
1287                 if (pch) {
1288                         *pch = '\0';
1289                         liface = strdup(pch + 1);
1290                 } else {
1291                         liface = strdup(iface);
1292                 }
1293
1294                 if (!force) {
1295                         const llist_t *iface_state = find_iface_state(state_list, iface);
1296
1297                         if (cmds == iface_up) {
1298                                 /* ifup */
1299                                 if (iface_state) {
1300                                         error_msg("interface %s already configured", iface);
1301                                         continue;
1302                                 }
1303                         } else {
1304                                 /* ifdown */
1305                                 if (iface_state) {
1306                                         error_msg("interface %s not configured", iface);
1307                                         continue;
1308                                 }
1309                         }
1310                 }
1311
1312 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1313                 if ((cmds == iface_up) && run_mappings) {
1314                         mapping_defn_t *currmap;
1315
1316                         for (currmap = defn->mappings; currmap; currmap = currmap->next) {
1317
1318                                 for (i = 0; i < currmap->n_matches; i++) {
1319                                         if (fnmatch(currmap->match[i], liface, 0) != 0)
1320                                                 continue;
1321                                         if (verbose) {
1322                                                 error_msg("Running mapping script %s on %s", currmap->script, liface);
1323                                         }
1324                                         run_mapping(iface, liface, sizeof(liface), currmap);
1325                                         break;
1326                                 }
1327                         }
1328                 }
1329 #endif
1330
1331                 for (currif = defn->ifaces; currif; currif = currif->next) {
1332                         if (strcmp(liface, currif->iface) == 0) {
1333                                 char *oldiface = currif->iface;
1334
1335                                 okay = 1;
1336                                 currif->iface = iface;
1337
1338                                 if (verbose) {
1339                                         error_msg("Configuring interface %s=%s (%s)", iface, liface, currif->address_family->name);
1340                                 }
1341
1342                                 /* Call the cmds function pointer, does either iface_up() or iface_down() */
1343                                 if (cmds(currif) == -1) {
1344                                         printf
1345                                                 ("Don't seem to be have all the variables for %s/%s.\n",
1346                                                  liface, currif->address_family->name);
1347                                 }
1348
1349                                 currif->iface = oldiface;
1350                         }
1351                 }
1352
1353                 if (!okay && !force) {
1354                         error_msg("Ignoring unknown interface %s=%s.", iface, liface);
1355                 } else {
1356                         llist_t *iface_state = find_iface_state(state_list, iface);
1357
1358                         if (cmds == iface_up) {
1359                                 char *newiface = xmalloc(xstrlen(iface) + 1 + xstrlen(liface) + 1);
1360                                 sprintf(newiface, "%s=%s", iface, liface);
1361                                 if (iface_state == NULL) {
1362                                         state_list = llist_add_to(state_list, newiface);
1363                                 } else {
1364                                         free(iface_state->data);
1365                                         iface_state->data = newiface;
1366                                 }
1367                         } else if (cmds == iface_down) {
1368                                 /* Remove an interface from the linked list */
1369                                 if (iface_state) {
1370                                         /* This needs to be done better */
1371                                         free(iface_state->data);
1372                                         free(iface_state->link);
1373                                         if (iface_state->link) {
1374                                                 iface_state->data = iface_state->link->data;
1375                                                 iface_state->link = iface_state->link->link;
1376                                         } else {
1377                                                 iface_state->data = NULL;
1378                                                 iface_state->link = NULL;
1379                                         }
1380                                 }
1381                         }
1382                 }
1383         }
1384
1385         /* Actually write the new state */
1386         if (!no_act) {
1387
1388                 if (state_fp)
1389                         fclose(state_fp);
1390                 state_fp = xfopen(statefile, "a+");
1391
1392                 if (ftruncate(fileno(state_fp), 0) < 0) {
1393                         error_msg_and_die("failed to truncate statefile %s: %s", statefile, strerror(errno));
1394                 }
1395
1396                 rewind(state_fp);
1397
1398                 while (state_list) {
1399                         if (state_list->data) {
1400                                 fputs(state_list->data, state_fp);
1401                                 fputc('\n', state_fp);
1402                         }
1403                         state_list = state_list->link;
1404                 }
1405                 fflush(state_fp);
1406         }
1407
1408         /* Cleanup */
1409         if (state_fp != NULL) {
1410                 fclose(state_fp);
1411                 state_fp = NULL;
1412         }
1413
1414         return 0;
1415 }