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 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
29 #define MAX_INTERFACE_LENGTH 10
32 #define debug_noise(args...) /*fprintf(stderr, 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 #define OPTION_STR "anvf" USE_FEATURE_IFUPDOWN_MAPPING("m") "i:"
98 OPT_no_mappings = 0x10,
100 #define DO_ALL (option_mask32 & OPT_do_all)
101 #define NO_ACT (option_mask32 & OPT_no_act)
102 #define VERBOSE (option_mask32 & OPT_verbose)
103 #define FORCE (option_mask32 & OPT_force)
104 #define NO_MAPPINGS (option_mask32 & OPT_no_mappings)
106 static char **my_environ;
108 static char *startup_PATH;
110 #if ENABLE_FEATURE_IFUPDOWN_IPV4 || ENABLE_FEATURE_IFUPDOWN_IPV6
112 #if ENABLE_FEATURE_IFUPDOWN_IP
114 static unsigned count_bits(unsigned a)
117 result = (a & 0x55) + ((a >> 1) & 0x55);
118 result = (result & 0x33) + ((result >> 2) & 0x33);
119 return (result & 0x0F) + ((result >> 4) & 0x0F);
122 static int count_netmask_bits(char *dotted_quad)
124 unsigned result, a, b, c, d;
125 /* Found a netmask... Check if it is dotted quad */
126 if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) != 4)
128 // FIXME: will be confused by e.g. 255.0.255.0
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 **bufp, const char *str, size_t str_length)
139 /* xasprintf trick will be smaller, but we are often
140 * called with str_length == 1 - don't want to have
141 * THAT much of malloc/freeing! */
143 int len = (buf ? strlen(buf) : 0);
145 buf = xrealloc(buf, len + str_length);
146 /* copies at most str_length-1 chars! */
147 safe_strncpy(buf + len, str, str_length);
151 static int strncmpz(const char *l, const char *r, size_t llen)
153 int i = strncmp(l, r, llen);
160 static char *get_var(const char *id, size_t idlen, struct interface_defn_t *ifd)
164 if (strncmpz(id, "iface", idlen) == 0) {
166 static char label_buf[20];
167 safe_strncpy(label_buf, ifd->iface, sizeof(label_buf));
168 result = strchr(label_buf, ':');
174 if (strncmpz(id, "label", idlen) == 0) {
177 for (i = 0; i < ifd->n_options; i++) {
178 if (strncmpz(id, ifd->option[i].name, idlen) == 0) {
179 return ifd->option[i].value;
185 static char *parse(const char *command, struct interface_defn_t *ifd)
187 size_t old_pos[MAX_OPT_DEPTH] = { 0 };
188 int okay[MAX_OPT_DEPTH] = { 1 };
195 addstr(&result, command, 1);
200 addstr(&result, command + 1, 1);
203 addstr(&result, command, 1);
208 if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) {
209 old_pos[opt_depth] = result ? strlen(result) : 0;
214 addstr(&result, "[", 1);
219 if (command[1] == ']' && opt_depth > 1) {
221 if (!okay[opt_depth]) {
222 result[old_pos[opt_depth]] = '\0';
226 addstr(&result, "]", 1);
236 nextpercent = strchr(command, '%');
243 varvalue = get_var(command, nextpercent - command, ifd);
246 addstr(&result, varvalue, strlen(varvalue));
248 #if ENABLE_FEATURE_IFUPDOWN_IP
249 /* Sigh... Add a special case for 'ip' to convert from
250 * dotted quad to bit count style netmasks. */
251 if (strncmp(command, "bnmask", 6) == 0) {
253 varvalue = get_var("netmask", 7, ifd);
254 if (varvalue && (res = count_netmask_bits(varvalue)) > 0) {
255 const char *argument = utoa(res);
256 addstr(&result, argument, strlen(argument));
257 command = nextpercent + 1;
262 okay[opt_depth - 1] = 0;
265 command = nextpercent + 1;
286 /* execute() returns 1 for success and 0 for failure */
287 static int execute(const char *command, struct interface_defn_t *ifd, execfn *exec)
292 out = parse(command, ifd);
297 /* out == "": parsed ok but not all needed variables known, skip */
298 ret = out[0] ? (*exec)(out) : 1;
308 #if ENABLE_FEATURE_IFUPDOWN_IPV6
309 static int loopback_up6(struct interface_defn_t *ifd, execfn *exec)
311 #if ENABLE_FEATURE_IFUPDOWN_IP
313 result = execute("ip addr add ::1 dev %iface%", ifd, exec);
314 result += execute("ip link set %iface% up", ifd, exec);
315 return ((result == 2) ? 2 : 0);
317 return execute("ifconfig %iface% add ::1", ifd, exec);
321 static int loopback_down6(struct interface_defn_t *ifd, execfn *exec)
323 #if ENABLE_FEATURE_IFUPDOWN_IP
324 return execute("ip link set %iface% down", ifd, exec);
326 return execute("ifconfig %iface% del ::1", ifd, exec);
330 static int static_up6(struct interface_defn_t *ifd, execfn *exec)
333 #if ENABLE_FEATURE_IFUPDOWN_IP
334 result = execute("ip addr add %address%/%netmask% dev %iface%[[ label %label%]]", ifd, exec);
335 result += execute("ip link set[[ mtu %mtu%]][[ address %hwaddress%]] %iface% up", ifd, exec);
336 /* Was: "[[ ip ....%gateway% ]]". Removed extra spaces w/o checking */
337 result += execute("[[ip route add ::/0 via %gateway%]]", ifd, exec);
339 result = execute("ifconfig %iface%[[ media %media%]][[ hw %hwaddress%]][[ mtu %mtu%]] up", ifd, exec);
340 result += execute("ifconfig %iface% add %address%/%netmask%", ifd, exec);
341 result += execute("[[route -A inet6 add ::/0 gw %gateway%]]", ifd, exec);
343 return ((result == 3) ? 3 : 0);
346 static int static_down6(struct interface_defn_t *ifd, execfn *exec)
348 #if ENABLE_FEATURE_IFUPDOWN_IP
349 return execute("ip link set %iface% down", ifd, exec);
351 return execute("ifconfig %iface% down", ifd, exec);
355 #if ENABLE_FEATURE_IFUPDOWN_IP
356 static int v4tunnel_up(struct interface_defn_t *ifd, execfn *exec)
359 result = execute("ip tunnel add %iface% mode sit remote "
360 "%endpoint%[[ local %local%]][[ ttl %ttl%]]", ifd, exec);
361 result += execute("ip link set %iface% up", ifd, exec);
362 result += execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec);
363 result += execute("[[ip route add ::/0 via %gateway%]]", ifd, exec);
364 return ((result == 4) ? 4 : 0);
367 static int v4tunnel_down(struct interface_defn_t * ifd, execfn * exec)
369 return execute("ip tunnel del %iface%", ifd, exec);
373 static const struct method_t methods6[] = {
374 #if ENABLE_FEATURE_IFUPDOWN_IP
375 { "v4tunnel", v4tunnel_up, v4tunnel_down, },
377 { "static", static_up6, static_down6, },
378 { "loopback", loopback_up6, loopback_down6, },
381 static const struct address_family_t addr_inet6 = {
383 sizeof(methods6) / sizeof(struct method_t),
386 #endif /* FEATURE_IFUPDOWN_IPV6 */
388 #if ENABLE_FEATURE_IFUPDOWN_IPV4
389 static int loopback_up(struct interface_defn_t *ifd, execfn *exec)
391 #if ENABLE_FEATURE_IFUPDOWN_IP
393 result = execute("ip addr add 127.0.0.1/8 dev %iface%", ifd, exec);
394 result += execute("ip link set %iface% up", ifd, exec);
395 return ((result == 2) ? 2 : 0);
397 return execute("ifconfig %iface% 127.0.0.1 up", ifd, exec);
401 static int loopback_down(struct interface_defn_t *ifd, execfn *exec)
403 #if ENABLE_FEATURE_IFUPDOWN_IP
405 result = execute("ip addr flush dev %iface%", ifd, exec);
406 result += execute("ip link set %iface% down", ifd, exec);
407 return ((result == 2) ? 2 : 0);
409 return execute("ifconfig %iface% 127.0.0.1 down", ifd, exec);
413 static int static_up(struct interface_defn_t *ifd, execfn *exec)
416 #if ENABLE_FEATURE_IFUPDOWN_IP
417 result = execute("ip addr add %address%/%bnmask%[[ broadcast %broadcast%]] "
418 "dev %iface%[[ peer %pointopoint%]][[ label %label%]]", ifd, exec);
419 result += execute("ip link set[[ mtu %mtu%]][[ address %hwaddress%]] %iface% up", ifd, exec);
420 result += execute("[[ip route add default via %gateway% dev %iface%]]", ifd, exec);
421 return ((result == 3) ? 3 : 0);
423 /* ifconfig said to set iface up before it processes hw %hwaddress%,
424 * which then of course fails. Thus we run two separate ifconfig */
425 result = execute("ifconfig %iface%[[ hw %hwaddress%]][[ media %media%]][[ mtu %mtu%]] up",
427 result += execute("ifconfig %iface% %address% netmask %netmask%"
428 "[[ broadcast %broadcast%]][[ pointopoint %pointopoint%]] ",
430 result += execute("[[route add default gw %gateway% %iface%]]", ifd, exec);
431 return ((result == 3) ? 3 : 0);
435 static int static_down(struct interface_defn_t *ifd, execfn *exec)
438 #if ENABLE_FEATURE_IFUPDOWN_IP
439 result = execute("ip addr flush dev %iface%", ifd, exec);
440 result += execute("ip link set %iface% down", ifd, exec);
442 result = execute("[[route del default gw %gateway% %iface%]]", ifd, exec);
443 result += execute("ifconfig %iface% down", ifd, exec);
445 return ((result == 2) ? 2 : 0);
448 #if !ENABLE_APP_UDHCPC
452 const char *startcmd;
456 static const struct dhcp_client_t ext_dhcp_clients[] = {
458 "udhcpc -R -n -p /var/run/udhcpc.%iface%.pid -i %iface%[[ -H %hostname%]][[ -c %clientid%]][[ -s %script%]]",
459 "kill -TERM `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
462 "pump -i %iface%[[ -h %hostname%]][[ -l %leasehours%]]",
463 "pump -i %iface% -k",
466 "dhclient -pf /var/run/dhclient.%iface%.pid %iface%",
467 "kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null",
470 "dhcpcd[[ -h %hostname%]][[ -i %vendor%]][[ -I %clientid%]][[ -l %leasetime%]] %iface%",
476 static int dhcp_up(struct interface_defn_t *ifd, execfn *exec)
478 #if ENABLE_APP_UDHCPC
479 return execute("udhcpc -R -n -p /var/run/udhcpc.%iface%.pid "
480 "-i %iface%[[ -H %hostname%]][[ -c %clientid%]][[ -s %script%]]",
483 int i, nclients = sizeof(ext_dhcp_clients) / sizeof(ext_dhcp_clients[0]);
484 for (i = 0; i < nclients; i++) {
485 if (exists_execable(ext_dhcp_clients[i].name))
486 return execute(ext_dhcp_clients[i].startcmd, ifd, exec);
488 bb_error_msg("no dhcp clients found");
493 static int dhcp_down(struct interface_defn_t *ifd, execfn *exec)
495 #if ENABLE_APP_UDHCPC
496 return execute("kill -TERM "
497 "`cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec);
499 int i, nclients = sizeof(ext_dhcp_clients) / sizeof(ext_dhcp_clients[0]);
500 for (i = 0; i < nclients; i++) {
501 if (exists_execable(ext_dhcp_clients[i].name))
502 return execute(ext_dhcp_clients[i].stopcmd, ifd, exec);
504 bb_error_msg("no dhcp clients found, using static interface shutdown");
505 return static_down(ifd, exec);
509 static int manual_up_down(struct interface_defn_t *ifd, execfn *exec)
514 static int bootp_up(struct interface_defn_t *ifd, execfn *exec)
516 return execute("bootpc[[ --bootfile %bootfile%]] --dev %iface%"
517 "[[ --server %server%]][[ --hwaddr %hwaddr%]] "
518 "--returniffail --serverbcast", ifd, exec);
521 static int ppp_up(struct interface_defn_t *ifd, execfn *exec)
523 return execute("pon[[ %provider%]]", ifd, exec);
526 static int ppp_down(struct interface_defn_t *ifd, execfn *exec)
528 return execute("poff[[ %provider%]]", ifd, exec);
531 static int wvdial_up(struct interface_defn_t *ifd, execfn *exec)
533 return execute("start-stop-daemon --start -x wvdial "
534 "-p /var/run/wvdial.%iface% -b -m --[[ %provider%]]", ifd, exec);
537 static int wvdial_down(struct interface_defn_t *ifd, execfn *exec)
539 return execute("start-stop-daemon --stop -x wvdial "
540 "-p /var/run/wvdial.%iface% -s 2", ifd, exec);
543 static const struct method_t methods[] = {
544 { "manual", manual_up_down, manual_up_down, },
545 { "wvdial", wvdial_up, wvdial_down, },
546 { "ppp", ppp_up, ppp_down, },
547 { "static", static_up, static_down, },
548 { "bootp", bootp_up, static_down, },
549 { "dhcp", dhcp_up, dhcp_down, },
550 { "loopback", loopback_up, loopback_down, },
553 static const struct address_family_t addr_inet = {
555 sizeof(methods) / sizeof(struct method_t),
559 #endif /* if ENABLE_FEATURE_IFUPDOWN_IPV4 */
561 static char *next_word(char **buf)
563 unsigned short length;
566 if (!buf || !*buf || !**buf) {
570 /* Skip over leading whitespace */
571 word = skip_whitespace(*buf);
573 /* Skip over comments */
578 /* Find the length of this word */
579 length = strcspn(word, " \t\n");
583 *buf = word + length;
584 /*DBU:[dave@cray.com] if we are already at EOL dont't increment beyond it */
593 static const struct address_family_t *get_address_family(const struct address_family_t *const af[], char *name)
600 for (i = 0; af[i]; i++) {
601 if (strcmp(af[i]->name, name) == 0) {
608 static const struct method_t *get_method(const struct address_family_t *af, char *name)
615 for (i = 0; i < af->n_methods; i++) {
616 if (strcmp(af->method[i].name, name) == 0) {
617 return &af->method[i];
623 static const llist_t *find_list_string(const llist_t *list, const char *string)
629 if (strcmp(list->data, string) == 0) {
637 static struct interfaces_file_t *read_interfaces(const char *filename)
639 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
640 struct mapping_defn_t *currmap = NULL;
642 struct interface_defn_t *currif = NULL;
643 struct interfaces_file_t *defn;
648 enum { NONE, IFACE, MAPPING } currently_processing = NONE;
650 defn = xzalloc(sizeof(struct interfaces_file_t));
652 f = xfopen(filename, "r");
654 while ((buf = xmalloc_getline(f)) != NULL) {
657 firstword = next_word(&buf_ptr);
658 if (firstword == NULL) {
660 continue; /* blank line */
663 if (strcmp(firstword, "mapping") == 0) {
664 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
665 currmap = xzalloc(sizeof(struct mapping_defn_t));
667 while ((firstword = next_word(&buf_ptr)) != NULL) {
668 if (currmap->max_matches == currmap->n_matches) {
669 currmap->max_matches = currmap->max_matches * 2 + 1;
670 currmap->match = xrealloc(currmap->match, sizeof(currmap->match) * currmap->max_matches);
673 currmap->match[currmap->n_matches++] = xstrdup(firstword);
675 currmap->max_mappings = 0;
676 currmap->n_mappings = 0;
677 currmap->mapping = NULL;
678 currmap->script = NULL;
680 struct mapping_defn_t **where = &defn->mappings;
681 while (*where != NULL) {
682 where = &(*where)->next;
685 currmap->next = NULL;
687 debug_noise("Added mapping\n");
689 currently_processing = MAPPING;
690 } else if (strcmp(firstword, "iface") == 0) {
691 static const struct address_family_t *const addr_fams[] = {
692 #if ENABLE_FEATURE_IFUPDOWN_IPV4
695 #if ENABLE_FEATURE_IFUPDOWN_IPV6
702 char *address_family_name;
706 currif = xzalloc(sizeof(struct interface_defn_t));
707 iface_name = next_word(&buf_ptr);
708 address_family_name = next_word(&buf_ptr);
709 method_name = next_word(&buf_ptr);
711 if (buf_ptr == NULL) {
712 bb_error_msg("too few parameters for line \"%s\"", buf);
716 /* ship any trailing whitespace */
717 buf_ptr = skip_whitespace(buf_ptr);
719 if (buf_ptr[0] != '\0') {
720 bb_error_msg("too many parameters \"%s\"", buf);
724 currif->iface = xstrdup(iface_name);
726 currif->address_family = get_address_family(addr_fams, address_family_name);
727 if (!currif->address_family) {
728 bb_error_msg("unknown address type \"%s\"", address_family_name);
732 currif->method = get_method(currif->address_family, method_name);
733 if (!currif->method) {
734 bb_error_msg("unknown method \"%s\"", method_name);
738 for (iface_list = defn->ifaces; iface_list; iface_list = iface_list->link) {
739 struct interface_defn_t *tmp = (struct interface_defn_t *) iface_list->data;
740 if ((strcmp(tmp->iface, currif->iface) == 0) &&
741 (tmp->address_family == currif->address_family)) {
742 bb_error_msg("duplicate interface \"%s\"", tmp->iface);
746 llist_add_to_end(&(defn->ifaces), (char*)currif);
748 debug_noise("iface %s %s %s\n", currif->iface, address_family_name, method_name);
749 currently_processing = IFACE;
750 } else if (strcmp(firstword, "auto") == 0) {
751 while ((firstword = next_word(&buf_ptr)) != NULL) {
753 /* Check the interface isnt already listed */
754 if (find_list_string(defn->autointerfaces, firstword)) {
755 bb_perror_msg_and_die("interface declared auto twice \"%s\"", buf);
758 /* Add the interface to the list */
759 llist_add_to_end(&(defn->autointerfaces), xstrdup(firstword));
760 debug_noise("\nauto %s\n", firstword);
762 currently_processing = NONE;
764 switch (currently_processing) {
769 if (strlen(buf_ptr) == 0) {
770 bb_error_msg("option with empty value \"%s\"", buf);
774 if (strcmp(firstword, "up") != 0
775 && strcmp(firstword, "down") != 0
776 && strcmp(firstword, "pre-up") != 0
777 && strcmp(firstword, "post-down") != 0) {
778 for (i = 0; i < currif->n_options; i++) {
779 if (strcmp(currif->option[i].name, firstword) == 0) {
780 bb_error_msg("duplicate option \"%s\"", buf);
786 if (currif->n_options >= currif->max_options) {
787 struct variable_t *opt;
789 currif->max_options = currif->max_options + 10;
790 opt = xrealloc(currif->option, sizeof(*opt) * currif->max_options);
791 currif->option = opt;
793 currif->option[currif->n_options].name = xstrdup(firstword);
794 currif->option[currif->n_options].value = xstrdup(buf_ptr);
795 if (!currif->option[currif->n_options].name) {
799 if (!currif->option[currif->n_options].value) {
803 debug_noise("\t%s=%s\n", currif->option[currif->n_options].name,
804 currif->option[currif->n_options].value);
808 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
809 if (strcmp(firstword, "script") == 0) {
810 if (currmap->script != NULL) {
811 bb_error_msg("duplicate script in mapping \"%s\"", buf);
814 currmap->script = xstrdup(next_word(&buf_ptr));
816 } else if (strcmp(firstword, "map") == 0) {
817 if (currmap->max_mappings == currmap->n_mappings) {
818 currmap->max_mappings = currmap->max_mappings * 2 + 1;
819 currmap->mapping = xrealloc(currmap->mapping, sizeof(char *) * currmap->max_mappings);
821 currmap->mapping[currmap->n_mappings] = xstrdup(next_word(&buf_ptr));
822 currmap->n_mappings++;
824 bb_error_msg("misplaced option \"%s\"", buf);
831 bb_error_msg("misplaced option \"%s\"", buf);
837 if (ferror(f) != 0) {
838 bb_perror_msg_and_die("%s", filename);
845 static char *setlocalenv(const char *format, const char *name, const char *value)
851 result = xasprintf(format, name, value);
853 for (here = there = result; *there != '=' && *there; there++) {
857 *there = toupper(*there);
859 if (isalnum(*there) || *there == '_') {
864 memmove(here, there, strlen(there) + 1);
869 static void set_environ(struct interface_defn_t *iface, const char *mode)
873 const int n_env_entries = iface->n_options + 5;
876 if (my_environ != NULL) {
877 for (ppch = my_environ; *ppch; ppch++) {
883 my_environ = xzalloc(sizeof(char *) * (n_env_entries + 1 /* for final NULL */ ));
884 environend = my_environ;
886 for (i = 0; i < iface->n_options; i++) {
887 if (strcmp(iface->option[i].name, "up") == 0
888 || strcmp(iface->option[i].name, "down") == 0
889 || strcmp(iface->option[i].name, "pre-up") == 0
890 || strcmp(iface->option[i].name, "post-down") == 0) {
893 *(environend++) = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value);
896 *(environend++) = setlocalenv("%s=%s", "IFACE", iface->iface);
897 *(environend++) = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name);
898 *(environend++) = setlocalenv("%s=%s", "METHOD", iface->method->name);
899 *(environend++) = setlocalenv("%s=%s", "MODE", mode);
900 *(environend++) = setlocalenv("%s=%s", "PATH", startup_PATH);
903 static int doit(char *str)
905 if (option_mask32 & (OPT_no_act|OPT_verbose)) {
908 if (!(option_mask32 & OPT_no_act)) {
915 case -1: /* failure */
918 execle(DEFAULT_SHELL, DEFAULT_SHELL, "-c", str, NULL, my_environ);
921 waitpid(child, &status, 0);
922 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
929 static int execute_all(struct interface_defn_t *ifd, const char *opt)
933 for (i = 0; i < ifd->n_options; i++) {
934 if (strcmp(ifd->option[i].name, opt) == 0) {
935 if (!doit(ifd->option[i].value)) {
941 buf = xasprintf("run-parts /etc/network/if-%s.d", opt);
942 /* heh, we don't bother free'ing it */
946 static int check(char *str)
951 static int iface_up(struct interface_defn_t *iface)
953 if (!iface->method->up(iface, check)) return -1;
954 set_environ(iface, "start");
955 if (!execute_all(iface, "pre-up")) return 0;
956 if (!iface->method->up(iface, doit)) return 0;
957 if (!execute_all(iface, "up")) return 0;
961 static int iface_down(struct interface_defn_t *iface)
963 if (!iface->method->down(iface,check)) return -1;
964 set_environ(iface, "stop");
965 if (!execute_all(iface, "down")) return 0;
966 if (!iface->method->down(iface, doit)) return 0;
967 if (!execute_all(iface, "post-down")) return 0;
971 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
972 static int popen2(FILE **in, FILE **out, char *command, ...)
975 char *argv[11] = { command };
977 int infd[2], outfd[2];
981 va_start(ap, command);
982 while ((argc < 10) && (argv[argc] = va_arg(ap, char *))) {
985 argv[argc] = NULL; /* make sure */
988 if (pipe(infd) != 0) {
992 if (pipe(outfd) != 0) {
999 switch (pid = fork()) {
1000 case -1: /* failure */
1013 execvp(command, argv);
1015 default: /* parent */
1016 *in = fdopen(infd[1], "w");
1017 *out = fdopen(outfd[0], "r");
1025 static char *run_mapping(char *physical, struct mapping_defn_t * map)
1031 char *logical = xstrdup(physical);
1033 /* Run the mapping script. */
1034 pid = popen2(&in, &out, map->script, physical, NULL);
1036 /* popen2() returns 0 on failure. */
1040 /* Write mappings to stdin of mapping script. */
1041 for (i = 0; i < map->n_mappings; i++) {
1042 fprintf(in, "%s\n", map->mapping[i]);
1045 waitpid(pid, &status, 0);
1047 if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
1048 /* If the mapping script exited successfully, try to
1049 * grab a line of output and use that as the name of the
1050 * logical interface. */
1051 char *new_logical = xmalloc(MAX_INTERFACE_LENGTH);
1053 if (fgets(new_logical, MAX_INTERFACE_LENGTH, out)) {
1054 /* If we are able to read a line of output from the script,
1055 * remove any trailing whitespace and use this value
1056 * as the name of the logical interface. */
1057 char *pch = new_logical + strlen(new_logical) - 1;
1059 while (pch >= new_logical && isspace(*pch))
1063 logical = new_logical;
1065 /* If we are UNABLE to read a line of output, discard our
1066 * freshly allocated memory. */
1075 #endif /* FEATURE_IFUPDOWN_MAPPING */
1077 static llist_t *find_iface_state(llist_t *state_list, const char *iface)
1079 unsigned short iface_len = strlen(iface);
1080 llist_t *search = state_list;
1083 if ((strncmp(search->data, iface, iface_len) == 0) &&
1084 (search->data[iface_len] == '=')) {
1087 search = search->link;
1092 int ifupdown_main(int argc, char **argv)
1094 int (*cmds)(struct interface_defn_t *) = NULL;
1095 struct interfaces_file_t *defn;
1096 llist_t *state_list = NULL;
1097 llist_t *target_list = NULL;
1098 const char *interfaces = "/etc/network/interfaces";
1099 int any_failures = 0;
1102 if (applet_name[2] == 'u') {
1107 getopt32(argc, argv, OPTION_STR, &interfaces);
1108 if (argc - optind > 0) {
1109 if (DO_ALL) bb_show_usage();
1111 if (!DO_ALL) bb_show_usage();
1114 debug_noise("reading %s file:\n", interfaces);
1115 defn = read_interfaces(interfaces);
1116 debug_noise("\ndone reading %s\n\n", interfaces);
1119 return EXIT_FAILURE;
1122 startup_PATH = getenv("PATH");
1123 if (!startup_PATH) startup_PATH = "";
1125 /* Create a list of interfaces to work on */
1127 if (cmds == iface_up) {
1128 target_list = defn->autointerfaces;
1131 const llist_t *list = state_list;
1133 llist_add_to_end(&target_list, xstrdup(list->data));
1136 target_list = defn->autointerfaces;
1139 llist_add_to_end(&target_list, argv[optind]);
1142 /* Update the interfaces */
1143 while (target_list) {
1144 llist_t *iface_list;
1145 struct interface_defn_t *currif;
1152 iface = xstrdup(target_list->data);
1153 target_list = target_list->link;
1155 pch = strchr(iface, '=');
1158 liface = xstrdup(pch + 1);
1160 liface = xstrdup(iface);
1164 const llist_t *iface_state = find_iface_state(state_list, iface);
1166 if (cmds == iface_up) {
1169 bb_error_msg("interface %s already configured", iface);
1175 bb_error_msg("interface %s not configured", iface);
1181 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
1182 if ((cmds == iface_up) && !NO_MAPPINGS) {
1183 struct mapping_defn_t *currmap;
1185 for (currmap = defn->mappings; currmap; currmap = currmap->next) {
1187 for (i = 0; i < currmap->n_matches; i++) {
1188 if (fnmatch(currmap->match[i], liface, 0) != 0)
1191 printf("Running mapping script %s on %s\n", currmap->script, liface);
1193 liface = run_mapping(iface, currmap);
1200 iface_list = defn->ifaces;
1201 while (iface_list) {
1202 currif = (struct interface_defn_t *) iface_list->data;
1203 if (strcmp(liface, currif->iface) == 0) {
1204 char *oldiface = currif->iface;
1207 currif->iface = iface;
1209 debug_noise("\nConfiguring interface %s (%s)\n", liface, currif->address_family->name);
1211 /* Call the cmds function pointer, does either iface_up() or iface_down() */
1212 cmds_ret = cmds(currif);
1213 if (cmds_ret == -1) {
1214 bb_error_msg("don't seem to have all the variables for %s/%s",
1215 liface, currif->address_family->name);
1217 } else if (cmds_ret == 0) {
1221 currif->iface = oldiface;
1223 iface_list = iface_list->link;
1229 if (!okay && !FORCE) {
1230 bb_error_msg("ignoring unknown interface %s", liface);
1233 llist_t *iface_state = find_iface_state(state_list, iface);
1235 if (cmds == iface_up) {
1236 char *newiface = xasprintf("%s=%s", iface, liface);
1237 if (iface_state == NULL) {
1238 llist_add_to_end(&state_list, newiface);
1240 free(iface_state->data);
1241 iface_state->data = newiface;
1244 /* Remove an interface from the linked list */
1245 free(llist_pop(&iface_state));
1250 /* Actually write the new state */
1254 state_fp = xfopen("/var/run/ifstate", "w");
1255 while (state_list) {
1256 if (state_list->data) {
1257 fprintf(state_fp, "%s\n", state_list->data);
1259 state_list = state_list->link;
1264 return any_failures;