1 /* vi: set sw=4 ts=4: */
4 * Copyright (c) 2002 Glenn McGrath <bug1@iinet.net.au>
5 * Copyright (c) 2003-2004 Erik Andersen <andersen@codepoet.org>
7 * Based on ifupdown v 0.6.4 by Anthony Towns
8 * Copyright (c) 1999 Anthony Towns <aj@azure.humbug.org.au>
10 * Changes to upstream version
11 * Remove checks for kernel version, assume kernel version 2.2.0 or better.
12 * Lines in the interfaces file cannot wrap.
13 * To adhere to the FHS, the default state file is /var/run/ifstate.
15 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
19 #include <sys/utsname.h>
23 #define MAX_OPT_DEPTH 10
24 #define EUNBALBRACK 10001
25 #define EUNDEFVAR 10002
26 #define EUNBALPER 10000
28 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
29 #define MAX_INTERFACE_LENGTH 10
32 #define debug_noise(fmt, args...)
34 /* Forward declaration */
35 struct interface_defn_t;
37 typedef int (execfn)(char *command);
42 int (*up)(struct interface_defn_t *ifd, execfn *e);
43 int (*down)(struct interface_defn_t *ifd, execfn *e);
46 struct address_family_t
50 const struct method_t *method;
55 struct mapping_defn_t *next;
74 struct interface_defn_t
76 const struct address_family_t *address_family;
77 const struct method_t *method;
82 struct variable_t *option;
85 struct interfaces_file_t
87 llist_t *autointerfaces;
89 struct mapping_defn_t *mappings;
92 static unsigned option_mask;
93 #define OPTION_STR "anvf" USE_FEATURE_IFUPDOWN_MAPPING("m") "i:"
99 OPT_no_mappings = 0x10,
101 #define DO_ALL (option_mask & OPT_do_all)
102 #define NO_ACT (option_mask & OPT_no_act)
103 #define VERBOSE (option_mask & OPT_verbose)
104 #define FORCE (option_mask & OPT_force)
105 #define NO_MAPPINGS (option_mask & OPT_no_mappings)
107 static char **__myenviron;
109 static char *startup_PATH;
111 #if ENABLE_FEATURE_IFUPDOWN_IPV4 || ENABLE_FEATURE_IFUPDOWN_IPV6
113 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
115 static unsigned int count_bits(unsigned int a)
118 result = (a & 0x55) + ((a >> 1) & 0x55);
119 result = (result & 0x33) + ((result >> 2) & 0x33);
120 return ((result & 0x0F) + ((result >> 4) & 0x0F));
123 static int count_netmask_bits(char *dotted_quad)
125 unsigned int result, a, b, c, d;
126 /* Found a netmask... Check if it is dotted quad */
127 if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) != 4)
129 result = count_bits(a);
130 result += count_bits(b);
131 result += count_bits(c);
132 result += count_bits(d);
137 static void addstr(char **buf, size_t *len, size_t *pos, char *str, size_t str_length)
139 if (*pos + str_length >= *len) {
142 newbuf = xrealloc(*buf, *len * 2 + str_length + 1);
144 *len = *len * 2 + str_length + 1;
147 while (str_length-- >= 1) {
148 (*buf)[(*pos)++] = *str;
154 static int strncmpz(char *l, char *r, size_t llen)
156 int i = strncmp(l, r, llen);
165 static char *get_var(char *id, size_t idlen, struct interface_defn_t *ifd)
169 if (strncmpz(id, "iface", idlen) == 0) {
171 static char label_buf[20];
172 strncpy(label_buf, ifd->iface, 19);
174 result = strchr(label_buf, ':');
179 } else if (strncmpz(id, "label", idlen) == 0) {
182 for (i = 0; i < ifd->n_options; i++) {
183 if (strncmpz(id, ifd->option[i].name, idlen) == 0) {
184 return ifd->option[i].value;
192 static char *parse(char *command, struct interface_defn_t *ifd)
196 size_t pos = 0, len = 0;
197 size_t old_pos[MAX_OPT_DEPTH] = { 0 };
198 int okay[MAX_OPT_DEPTH] = { 1 };
204 addstr(&result, &len, &pos, command, 1);
209 addstr(&result, &len, &pos, command + 1, 1);
212 addstr(&result, &len, &pos, command, 1);
217 if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) {
218 old_pos[opt_depth] = pos;
223 addstr(&result, &len, &pos, "[", 1);
228 if (command[1] == ']' && opt_depth > 1) {
230 if (!okay[opt_depth]) {
231 pos = old_pos[opt_depth];
236 addstr(&result, &len, &pos, "]", 1);
246 nextpercent = strchr(command, '%');
253 varvalue = get_var(command, nextpercent - command, ifd);
256 addstr(&result, &len, &pos, varvalue, strlen(varvalue));
258 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
259 /* Sigh... Add a special case for 'ip' to convert from
260 * dotted quad to bit count style netmasks. */
261 if (strncmp(command, "bnmask", 6)==0) {
263 varvalue = get_var("netmask", 7, ifd);
264 if (varvalue && (res=count_netmask_bits(varvalue)) > 0) {
266 sprintf(argument, "%d", res);
267 addstr(&result, &len, &pos, argument, strlen(argument));
268 command = nextpercent + 1;
273 okay[opt_depth - 1] = 0;
276 command = nextpercent + 1;
297 /* execute() returns 1 for success and 0 for failure */
298 static int execute(char *command, struct interface_defn_t *ifd, execfn *exec)
303 out = parse(command, ifd);
317 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
318 static int loopback_up6(struct interface_defn_t *ifd, execfn *exec)
320 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
322 result = execute("ip addr add ::1 dev %iface%", ifd, exec);
323 result += execute("ip link set %iface% up", ifd, exec);
324 return ((result == 2) ? 2 : 0);
326 return execute("ifconfig %iface% add ::1", ifd, exec);
330 static int loopback_down6(struct interface_defn_t *ifd, execfn *exec)
332 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
333 return execute("ip link set %iface% down", ifd, exec);
335 return execute("ifconfig %iface% del ::1", ifd, exec);
339 static int static_up6(struct interface_defn_t *ifd, execfn *exec)
342 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
343 result = execute("ip addr add %address%/%netmask% dev %iface% [[label %label%]]", ifd, exec);
344 result += execute("ip link set [[mtu %mtu%]] [[address %hwaddress%]] %iface% up", ifd, exec);
345 result += execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec);
347 result = execute("ifconfig %iface% [[media %media%]] [[hw %hwaddress%]] [[mtu %mtu%]] up", ifd, exec);
348 result += execute("ifconfig %iface% add %address%/%netmask%", ifd, exec);
349 result += execute("[[ route -A inet6 add ::/0 gw %gateway% ]]", ifd, exec);
351 return ((result == 3) ? 3 : 0);
354 static int static_down6(struct interface_defn_t *ifd, execfn *exec)
356 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
357 return execute("ip link set %iface% down", ifd, exec);
359 return execute("ifconfig %iface% down", ifd, exec);
363 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
364 static int v4tunnel_up(struct interface_defn_t *ifd, execfn *exec)
367 result = execute("ip tunnel add %iface% mode sit remote "
368 "%endpoint% [[local %local%]] [[ttl %ttl%]]", ifd, exec);
369 result += execute("ip link set %iface% up", ifd, exec);
370 result += execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec);
371 result += execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec);
372 return ((result == 4) ? 4 : 0);
375 static int v4tunnel_down(struct interface_defn_t * ifd, execfn * exec)
377 return execute("ip tunnel del %iface%", ifd, exec);
381 static const struct method_t methods6[] = {
382 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
383 { "v4tunnel", v4tunnel_up, v4tunnel_down, },
385 { "static", static_up6, static_down6, },
386 { "loopback", loopback_up6, loopback_down6, },
389 static const struct address_family_t addr_inet6 = {
391 sizeof(methods6) / sizeof(struct method_t),
394 #endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */
396 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
397 static int loopback_up(struct interface_defn_t *ifd, execfn *exec)
399 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
401 result = execute("ip addr add 127.0.0.1/8 dev %iface%", ifd, exec);
402 result += execute("ip link set %iface% up", ifd, exec);
403 return ((result == 2) ? 2 : 0);
405 return execute("ifconfig %iface% 127.0.0.1 up", ifd, exec);
409 static int loopback_down(struct interface_defn_t *ifd, execfn *exec)
411 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
413 result = execute("ip addr flush dev %iface%", ifd, exec);
414 result += execute("ip link set %iface% down", ifd, exec);
415 return ((result == 2) ? 2 : 0);
417 return execute("ifconfig %iface% 127.0.0.1 down", ifd, exec);
421 static int static_up(struct interface_defn_t *ifd, execfn *exec)
424 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
425 result = execute("ip addr add %address%/%bnmask% [[broadcast %broadcast%]] "
426 "dev %iface% [[peer %pointopoint%]] [[label %label%]]", ifd, exec);
427 result += execute("ip link set [[mtu %mtu%]] [[address %hwaddress%]] %iface% up", ifd, exec);
428 result += execute("[[ ip route add default via %gateway% dev %iface% ]]", ifd, exec);
429 return ((result == 3) ? 3 : 0);
431 result = execute("ifconfig %iface% %address% netmask %netmask% "
432 "[[broadcast %broadcast%]] [[pointopoint %pointopoint%]] "
433 "[[media %media%]] [[mtu %mtu%]] [[hw %hwaddress%]] up",
435 result += execute("[[ route add default gw %gateway% %iface% ]]", ifd, exec);
436 return ((result == 2) ? 2 : 0);
440 static int static_down(struct interface_defn_t *ifd, execfn *exec)
443 #ifdef CONFIG_FEATURE_IFUPDOWN_IP
444 result = execute("ip addr flush dev %iface%", ifd, exec);
445 result += execute("ip link set %iface% down", ifd, exec);
447 result = execute("[[ route del default gw %gateway% %iface% ]]", ifd, exec);
448 result += execute("ifconfig %iface% down", ifd, exec);
450 return ((result == 2) ? 2 : 0);
453 static int dhcp_up(struct interface_defn_t *ifd, execfn *exec)
457 for (i = 0; i < ifd->n_options; i++) {
458 if (strcmp(ifd->option[i].name, "dhcp-start-cmd") == 0) {
459 return execute(ifd->option[i].value, ifd, exec);
463 if (execute("udhcpc -n -p /var/run/udhcpc.%iface%.pid -i "
464 "%iface% [[-H %hostname%]] [[-c %clientid%]]", ifd, exec)) return 1;
465 if (execute("pump -i %iface% [[-h %hostname%]] [[-l %leasehours%]]", ifd, exec)) return 1;
466 if (execute("dhclient -pf /var/run/dhclient.%iface%.pid %iface%", ifd, exec)) return 1;
467 if (execute("dhcpcd [[-h %hostname%]] [[-i %vendor%]] [[-I %clientid%]] "
468 "[[-l %leasetime%]] %iface%", ifd, exec)) return 1;
472 static int dhcp_down(struct interface_defn_t *ifd, execfn *exec)
476 for (i = 0; i < ifd->n_options; i++) {
477 if (strcmp(ifd->option[i].name, "dhcp-stop-cmd") == 0) {
478 return execute(ifd->option[i].value, ifd, exec);
482 /* SIGUSR2 forces udhcpc to release the current lease and go inactive,
483 * and SIGTERM causes udhcpc to exit. Signals are queued and processed
484 * sequentially so we don't need to sleep */
485 if (execute("kill -USR2 `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec)
486 || execute("kill -TERM `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec))
488 if (execute("pump -i %iface% -k", ifd, exec)) return 1;
489 if (execute("kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null", ifd, exec)) return 1;
490 if (execute("dhcpcd -k %iface%", ifd, exec)) return 1;
491 return static_down(ifd, exec);
494 static int bootp_up(struct interface_defn_t *ifd, execfn *exec)
496 return execute("bootpc [[--bootfile %bootfile%]] --dev %iface% "
497 "[[--server %server%]] [[--hwaddr %hwaddr%]] "
498 "--returniffail --serverbcast", ifd, exec);
501 static int ppp_up(struct interface_defn_t *ifd, execfn *exec)
503 return execute("pon [[%provider%]]", ifd, exec);
506 static int ppp_down(struct interface_defn_t *ifd, execfn *exec)
508 return execute("poff [[%provider%]]", ifd, exec);
511 static int wvdial_up(struct interface_defn_t *ifd, execfn *exec)
513 return execute("/sbin/start-stop-daemon --start -x /usr/bin/wvdial "
514 "-p /var/run/wvdial.%iface% -b -m -- [[ %provider% ]]", ifd, exec);
517 static int wvdial_down(struct interface_defn_t *ifd, execfn *exec)
519 return execute("/sbin/start-stop-daemon --stop -x /usr/bin/wvdial "
520 "-p /var/run/wvdial.%iface% -s 2", ifd, exec);
523 static const struct method_t methods[] = {
524 { "wvdial", wvdial_up, wvdial_down, },
525 { "ppp", ppp_up, ppp_down, },
526 { "static", static_up, static_down, },
527 { "bootp", bootp_up, static_down, },
528 { "dhcp", dhcp_up, dhcp_down, },
529 { "loopback", loopback_up, loopback_down, },
532 static const struct address_family_t addr_inet = {
534 sizeof(methods) / sizeof(struct method_t),
538 #endif /* ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 */
540 static char *next_word(char **buf)
542 unsigned short length;
545 if ((buf == NULL) || (*buf == NULL) || (**buf == '\0')) {
549 /* Skip over leading whitespace */
551 while (isspace(*word)) {
555 /* Skip over comments */
560 /* Find the length of this word */
561 length = strcspn(word, " \t\n");
565 *buf = word + length;
566 /*DBU:[dave@cray.com] if we are already at EOL dont't increment beyond it */
575 static const struct address_family_t *get_address_family(const struct address_family_t *const af[], char *name)
579 for (i = 0; af[i]; i++) {
580 if (strcmp(af[i]->name, name) == 0) {
587 static const struct method_t *get_method(const struct address_family_t *af, char *name)
591 for (i = 0; i < af->n_methods; i++) {
592 if (strcmp(af->method[i].name, name) == 0) {
593 return &af->method[i];
599 static const llist_t *find_list_string(const llist_t *list, const char *string)
602 if (strcmp(list->data, string) == 0) {
610 static struct interfaces_file_t *read_interfaces(const char *filename)
612 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
613 struct mapping_defn_t *currmap = NULL;
615 struct interface_defn_t *currif = NULL;
616 struct interfaces_file_t *defn;
621 enum { NONE, IFACE, MAPPING } currently_processing = NONE;
623 defn = xzalloc(sizeof(struct interfaces_file_t));
625 f = xfopen(filename, "r");
627 while ((buf = bb_get_chomped_line_from_file(f)) != NULL) {
630 firstword = next_word(&buf_ptr);
631 if (firstword == NULL) {
633 continue; /* blank line */
636 if (strcmp(firstword, "mapping") == 0) {
637 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
638 currmap = xzalloc(sizeof(struct mapping_defn_t));
640 while ((firstword = next_word(&buf_ptr)) != NULL) {
641 if (currmap->max_matches == currmap->n_matches) {
642 currmap->max_matches = currmap->max_matches * 2 + 1;
643 currmap->match = xrealloc(currmap->match, sizeof(currmap->match) * currmap->max_matches);
646 currmap->match[currmap->n_matches++] = xstrdup(firstword);
648 currmap->max_mappings = 0;
649 currmap->n_mappings = 0;
650 currmap->mapping = NULL;
651 currmap->script = NULL;
653 struct mapping_defn_t **where = &defn->mappings;
654 while (*where != NULL) {
655 where = &(*where)->next;
658 currmap->next = NULL;
660 debug_noise("Added mapping\n");
662 currently_processing = MAPPING;
663 } else if (strcmp(firstword, "iface") == 0) {
664 static const struct address_family_t *const addr_fams[] = {
665 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
668 #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
675 char *address_family_name;
679 currif = xzalloc(sizeof(struct interface_defn_t));
680 iface_name = next_word(&buf_ptr);
681 address_family_name = next_word(&buf_ptr);
682 method_name = next_word(&buf_ptr);
684 if (buf_ptr == NULL) {
685 bb_error_msg("too few parameters for line \"%s\"", buf);
689 /* ship any trailing whitespace */
690 while (isspace(*buf_ptr)) {
694 if (buf_ptr[0] != '\0') {
695 bb_error_msg("too many parameters \"%s\"", buf);
699 currif->iface = xstrdup(iface_name);
701 currif->address_family = get_address_family(addr_fams, address_family_name);
702 if (!currif->address_family) {
703 bb_error_msg("unknown address type \"%s\"", address_family_name);
707 currif->method = get_method(currif->address_family, method_name);
708 if (!currif->method) {
709 bb_error_msg("unknown method \"%s\"", method_name);
713 for (iface_list = defn->ifaces; iface_list; iface_list = iface_list->link) {
714 struct interface_defn_t *tmp = (struct interface_defn_t *) iface_list->data;
715 if ((strcmp(tmp->iface, currif->iface) == 0) &&
716 (tmp->address_family == currif->address_family)) {
717 bb_error_msg("duplicate interface \"%s\"", tmp->iface);
721 llist_add_to_end(&(defn->ifaces), (char*)currif);
723 debug_noise("iface %s %s %s\n", currif->iface, address_family_name, method_name);
724 currently_processing = IFACE;
725 } else if (strcmp(firstword, "auto") == 0) {
726 while ((firstword = next_word(&buf_ptr)) != NULL) {
728 /* Check the interface isnt already listed */
729 if (find_list_string(defn->autointerfaces, firstword)) {
730 bb_perror_msg_and_die("interface declared auto twice \"%s\"", buf);
733 /* Add the interface to the list */
734 llist_add_to_end(&(defn->autointerfaces), xstrdup(firstword));
735 debug_noise("\nauto %s\n", firstword);
737 currently_processing = NONE;
739 switch (currently_processing) {
744 if (strlen(buf_ptr) == 0) {
745 bb_error_msg("option with empty value \"%s\"", buf);
749 if (strcmp(firstword, "up") != 0
750 && strcmp(firstword, "down") != 0
751 && strcmp(firstword, "pre-up") != 0
752 && strcmp(firstword, "post-down") != 0) {
753 for (i = 0; i < currif->n_options; i++) {
754 if (strcmp(currif->option[i].name, firstword) == 0) {
755 bb_error_msg("duplicate option \"%s\"", buf);
761 if (currif->n_options >= currif->max_options) {
762 struct variable_t *opt;
764 currif->max_options = currif->max_options + 10;
765 opt = xrealloc(currif->option, sizeof(*opt) * currif->max_options);
766 currif->option = opt;
768 currif->option[currif->n_options].name = xstrdup(firstword);
769 currif->option[currif->n_options].value = xstrdup(buf_ptr);
770 if (!currif->option[currif->n_options].name) {
774 if (!currif->option[currif->n_options].value) {
778 debug_noise("\t%s=%s\n", currif->option[currif->n_options].name,
779 currif->option[currif->n_options].value);
783 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
784 if (strcmp(firstword, "script") == 0) {
785 if (currmap->script != NULL) {
786 bb_error_msg("duplicate script in mapping \"%s\"", buf);
789 currmap->script = xstrdup(next_word(&buf_ptr));
791 } else if (strcmp(firstword, "map") == 0) {
792 if (currmap->max_mappings == currmap->n_mappings) {
793 currmap->max_mappings = currmap->max_mappings * 2 + 1;
794 currmap->mapping = xrealloc(currmap->mapping, sizeof(char *) * currmap->max_mappings);
796 currmap->mapping[currmap->n_mappings] = xstrdup(next_word(&buf_ptr));
797 currmap->n_mappings++;
799 bb_error_msg("misplaced option \"%s\"", buf);
806 bb_error_msg("misplaced option \"%s\"", buf);
812 if (ferror(f) != 0) {
813 bb_perror_msg_and_die("%s", filename);
820 static char *setlocalenv(char *format, const char *name, const char *value)
826 result = xasprintf(format, name, value);
828 for (here = there = result; *there != '=' && *there; there++) {
832 *there = toupper(*there);
834 if (isalnum(*there) || *there == '_') {
839 memmove(here, there, strlen(there) + 1);
844 static void set_environ(struct interface_defn_t *iface, const char *mode)
848 const int n_env_entries = iface->n_options + 5;
851 if (__myenviron != NULL) {
852 for (ppch = __myenviron; *ppch; ppch++) {
858 __myenviron = xzalloc(sizeof(char *) * (n_env_entries + 1 /* for final NULL */ ));
859 environend = __myenviron;
861 for (i = 0; i < iface->n_options; i++) {
862 if (strcmp(iface->option[i].name, "up") == 0
863 || strcmp(iface->option[i].name, "down") == 0
864 || strcmp(iface->option[i].name, "pre-up") == 0
865 || strcmp(iface->option[i].name, "post-down") == 0) {
868 *(environend++) = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value);
871 *(environend++) = setlocalenv("%s=%s", "IFACE", iface->iface);
872 *(environend++) = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name);
873 *(environend++) = setlocalenv("%s=%s", "METHOD", iface->method->name);
874 *(environend++) = setlocalenv("%s=%s", "MODE", mode);
875 *(environend++) = setlocalenv("%s=%s", "PATH", startup_PATH);
878 static int doit(char *str)
880 if (option_mask & (OPT_no_act|OPT_verbose)) {
883 if (!(option_mask & OPT_no_act)) {
888 switch (child = fork()) {
889 case -1: /* failure */
892 execle(DEFAULT_SHELL, DEFAULT_SHELL, "-c", str, NULL, __myenviron);
895 waitpid(child, &status, 0);
896 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
903 static int execute_all(struct interface_defn_t *ifd, const char *opt)
907 for (i = 0; i < ifd->n_options; i++) {
908 if (strcmp(ifd->option[i].name, opt) == 0) {
909 if (!doit(ifd->option[i].value)) {
915 buf = xasprintf("run-parts /etc/network/if-%s.d", opt);
916 if (doit(buf) != 1) {
922 static int check(char *str) {
926 static int iface_up(struct interface_defn_t *iface)
928 if (!iface->method->up(iface,check)) return -1;
929 set_environ(iface, "start");
930 if (!execute_all(iface, "pre-up")) return 0;
931 if (!iface->method->up(iface, doit)) return 0;
932 if (!execute_all(iface, "up")) return 0;
936 static int iface_down(struct interface_defn_t *iface)
938 if (!iface->method->down(iface,check)) return -1;
939 set_environ(iface, "stop");
940 if (!execute_all(iface, "down")) return 0;
941 if (!iface->method->down(iface, doit)) return 0;
942 if (!execute_all(iface, "post-down")) return 0;
946 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
947 static int popen2(FILE **in, FILE **out, char *command, ...)
950 char *argv[11] = { command };
952 int infd[2], outfd[2];
956 va_start(ap, command);
957 while ((argc < 10) && (argv[argc] = va_arg(ap, char *))) {
960 argv[argc] = NULL; /* make sure */
963 if (pipe(infd) != 0) {
967 if (pipe(outfd) != 0) {
974 switch (pid = fork()) {
975 case -1: /* failure */
988 execvp(command, argv);
990 default: /* parent */
991 *in = fdopen(infd[1], "w");
992 *out = fdopen(outfd[0], "r");
1000 static char *run_mapping(char *physical, struct mapping_defn_t * map)
1006 char *logical = xstrdup(physical);
1008 /* Run the mapping script. */
1009 pid = popen2(&in, &out, map->script, physical, NULL);
1011 /* popen2() returns 0 on failure. */
1015 /* Write mappings to stdin of mapping script. */
1016 for (i = 0; i < map->n_mappings; i++) {
1017 fprintf(in, "%s\n", map->mapping[i]);
1020 waitpid(pid, &status, 0);
1022 if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
1023 /* If the mapping script exited successfully, try to
1024 * grab a line of output and use that as the name of the
1025 * logical interface. */
1026 char *new_logical = (char *)xmalloc(MAX_INTERFACE_LENGTH);
1028 if (fgets(new_logical, MAX_INTERFACE_LENGTH, out)) {
1029 /* If we are able to read a line of output from the script,
1030 * remove any trailing whitespace and use this value
1031 * as the name of the logical interface. */
1032 char *pch = new_logical + strlen(new_logical) - 1;
1034 while (pch >= new_logical && isspace(*pch))
1038 logical = new_logical;
1040 /* If we are UNABLE to read a line of output, discard our
1041 * freshly allocated memory. */
1050 #endif /* CONFIG_FEATURE_IFUPDOWN_MAPPING */
1052 static llist_t *find_iface_state(llist_t *state_list, const char *iface)
1054 unsigned short iface_len = strlen(iface);
1055 llist_t *search = state_list;
1058 if ((strncmp(search->data, iface, iface_len) == 0) &&
1059 (search->data[iface_len] == '=')) {
1062 search = search->link;
1067 int ifupdown_main(int argc, char **argv)
1069 static const char statefile[] = "/var/run/ifstate";
1071 int (*cmds)(struct interface_defn_t *) = NULL;
1072 struct interfaces_file_t *defn;
1073 llist_t *state_list = NULL;
1074 llist_t *target_list = NULL;
1075 const char *interfaces = "/etc/network/interfaces";
1076 int any_failures = 0;
1079 if (bb_applet_name[2] == 'u') {
1083 /* ifdown command */
1087 option_mask = bb_getopt_ulflags(argc, argv, OPTION_STR, &interfaces);
1088 if (argc - optind > 0) {
1089 if (DO_ALL) bb_show_usage();
1091 if (!DO_ALL) bb_show_usage();
1093 debug_noise("reading %s file:\n", interfaces);
1094 defn = read_interfaces(interfaces);
1095 debug_noise("\ndone reading %s\n\n", interfaces);
1101 startup_PATH = getenv("PATH");
1102 if (!startup_PATH) startup_PATH = "";
1104 /* Create a list of interfaces to work on */
1106 if (cmds == iface_up) {
1107 target_list = defn->autointerfaces;
1110 const llist_t *list = state_list;
1112 llist_add_to_end(&target_list, xstrdup(list->data));
1115 target_list = defn->autointerfaces;
1118 llist_add_to_end(&target_list, argv[optind]);
1122 /* Update the interfaces */
1123 while (target_list) {
1124 llist_t *iface_list;
1125 struct interface_defn_t *currif;
1132 iface = xstrdup(target_list->data);
1133 target_list = target_list->link;
1135 pch = strchr(iface, '=');
1138 liface = xstrdup(pch + 1);
1140 liface = xstrdup(iface);
1144 const llist_t *iface_state = find_iface_state(state_list, iface);
1146 if (cmds == iface_up) {
1149 bb_error_msg("interface %s already configured", iface);
1155 bb_error_msg("interface %s not configured", iface);
1161 #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
1162 if ((cmds == iface_up) && !NO_MAPPINGS) {
1163 struct mapping_defn_t *currmap;
1165 for (currmap = defn->mappings; currmap; currmap = currmap->next) {
1166 for (i = 0; i < currmap->n_matches; i++) {
1167 if (fnmatch(currmap->match[i], liface, 0) != 0)
1170 printf("Running mapping script %s on %s\n", currmap->script, liface);
1172 liface = run_mapping(iface, currmap);
1180 iface_list = defn->ifaces;
1181 while (iface_list) {
1182 currif = (struct interface_defn_t *) iface_list->data;
1183 if (strcmp(liface, currif->iface) == 0) {
1184 char *oldiface = currif->iface;
1187 currif->iface = iface;
1189 debug_noise("\nConfiguring interface %s (%s)\n", liface, currif->address_family->name);
1191 /* Call the cmds function pointer, does either iface_up() or iface_down() */
1192 cmds_ret = cmds(currif);
1193 if (cmds_ret == -1) {
1194 bb_error_msg("don't seem to have all the variables for %s/%s",
1195 liface, currif->address_family->name);
1197 } else if (cmds_ret == 0) {
1201 currif->iface = oldiface;
1203 iface_list = iface_list->link;
1209 if (!okay && !FORCE) {
1210 bb_error_msg("ignoring unknown interface %s", liface);
1213 llist_t *iface_state = find_iface_state(state_list, iface);
1215 if (cmds == iface_up) {
1216 char *newiface = xasprintf("%s=%s", iface, liface);
1217 if (iface_state == NULL) {
1218 llist_add_to_end(&state_list, newiface);
1220 free(iface_state->data);
1221 iface_state->data = newiface;
1224 /* Remove an interface from the linked list */
1225 free(llist_pop(&iface_state));
1230 /* Actually write the new state */
1232 FILE *state_fp = NULL;
1234 state_fp = xfopen(statefile, "w");
1235 while (state_list) {
1236 if (state_list->data) {
1237 fputs(state_list->data, state_fp);
1238 fputc('\n', state_fp);
1240 state_list = state_list->link;