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);
41 int (*up)(struct interface_defn_t *ifd, execfn *e);
42 int (*down)(struct interface_defn_t *ifd, execfn *e);
45 struct address_family_t {
48 const struct method_t *method;
51 struct mapping_defn_t {
52 struct mapping_defn_t *next;
70 struct interface_defn_t {
71 const struct address_family_t *address_family;
72 const struct method_t *method;
77 struct variable_t *option;
80 struct interfaces_file_t {
81 llist_t *autointerfaces;
83 struct mapping_defn_t *mappings;
86 #define OPTION_STR "anvf" USE_FEATURE_IFUPDOWN_MAPPING("m") "i:"
92 OPT_no_mappings = 0x10,
94 #define DO_ALL (option_mask32 & OPT_do_all)
95 #define NO_ACT (option_mask32 & OPT_no_act)
96 #define VERBOSE (option_mask32 & OPT_verbose)
97 #define FORCE (option_mask32 & OPT_force)
98 #define NO_MAPPINGS (option_mask32 & OPT_no_mappings)
100 static char **my_environ;
102 static const char *startup_PATH;
104 #if ENABLE_FEATURE_IFUPDOWN_IPV4 || ENABLE_FEATURE_IFUPDOWN_IPV6
106 #if ENABLE_FEATURE_IFUPDOWN_IP
108 static unsigned count_bits(unsigned a)
111 result = (a & 0x55) + ((a >> 1) & 0x55);
112 result = (result & 0x33) + ((result >> 2) & 0x33);
113 return (result & 0x0F) + ((result >> 4) & 0x0F);
116 static int count_netmask_bits(char *dotted_quad)
118 unsigned result, a, b, c, d;
119 /* Found a netmask... Check if it is dotted quad */
120 if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) != 4)
122 // FIXME: will be confused by e.g. 255.0.255.0
123 result = count_bits(a);
124 result += count_bits(b);
125 result += count_bits(c);
126 result += count_bits(d);
131 static void addstr(char **bufp, const char *str, size_t str_length)
133 /* xasprintf trick will be smaller, but we are often
134 * called with str_length == 1 - don't want to have
135 * THAT much of malloc/freeing! */
137 int len = (buf ? strlen(buf) : 0);
139 buf = xrealloc(buf, len + str_length);
140 /* copies at most str_length-1 chars! */
141 safe_strncpy(buf + len, str, str_length);
145 static int strncmpz(const char *l, const char *r, size_t llen)
147 int i = strncmp(l, r, llen);
154 static char *get_var(const char *id, size_t idlen, struct interface_defn_t *ifd)
158 if (strncmpz(id, "iface", idlen) == 0) {
160 static char label_buf[20];
161 safe_strncpy(label_buf, ifd->iface, sizeof(label_buf));
162 result = strchr(label_buf, ':');
168 if (strncmpz(id, "label", idlen) == 0) {
171 for (i = 0; i < ifd->n_options; i++) {
172 if (strncmpz(id, ifd->option[i].name, idlen) == 0) {
173 return ifd->option[i].value;
179 static char *parse(const char *command, struct interface_defn_t *ifd)
181 size_t old_pos[MAX_OPT_DEPTH] = { 0 };
182 int okay[MAX_OPT_DEPTH] = { 1 };
189 addstr(&result, command, 1);
194 addstr(&result, command + 1, 1);
197 addstr(&result, command, 1);
202 if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) {
203 old_pos[opt_depth] = result ? strlen(result) : 0;
208 addstr(&result, "[", 1);
213 if (command[1] == ']' && opt_depth > 1) {
215 if (!okay[opt_depth]) {
216 result[old_pos[opt_depth]] = '\0';
220 addstr(&result, "]", 1);
230 nextpercent = strchr(command, '%');
237 varvalue = get_var(command, nextpercent - command, ifd);
240 addstr(&result, varvalue, strlen(varvalue));
242 #if ENABLE_FEATURE_IFUPDOWN_IP
243 /* Sigh... Add a special case for 'ip' to convert from
244 * dotted quad to bit count style netmasks. */
245 if (strncmp(command, "bnmask", 6) == 0) {
247 varvalue = get_var("netmask", 7, ifd);
248 if (varvalue && (res = count_netmask_bits(varvalue)) > 0) {
249 const char *argument = utoa(res);
250 addstr(&result, argument, strlen(argument));
251 command = nextpercent + 1;
256 okay[opt_depth - 1] = 0;
259 command = nextpercent + 1;
280 /* execute() returns 1 for success and 0 for failure */
281 static int execute(const char *command, struct interface_defn_t *ifd, execfn *exec)
286 out = parse(command, ifd);
291 /* out == "": parsed ok but not all needed variables known, skip */
292 ret = out[0] ? (*exec)(out) : 1;
302 #if ENABLE_FEATURE_IFUPDOWN_IPV6
303 static int loopback_up6(struct interface_defn_t *ifd, execfn *exec)
305 #if ENABLE_FEATURE_IFUPDOWN_IP
307 result = execute("ip addr add ::1 dev %iface%", ifd, exec);
308 result += execute("ip link set %iface% up", ifd, exec);
309 return ((result == 2) ? 2 : 0);
311 return execute("ifconfig %iface% add ::1", ifd, exec);
315 static int loopback_down6(struct interface_defn_t *ifd, execfn *exec)
317 #if ENABLE_FEATURE_IFUPDOWN_IP
318 return execute("ip link set %iface% down", ifd, exec);
320 return execute("ifconfig %iface% del ::1", ifd, exec);
324 static int static_up6(struct interface_defn_t *ifd, execfn *exec)
327 #if ENABLE_FEATURE_IFUPDOWN_IP
328 result = execute("ip addr add %address%/%netmask% dev %iface%[[ label %label%]]", ifd, exec);
329 result += execute("ip link set[[ mtu %mtu%]][[ address %hwaddress%]] %iface% up", ifd, exec);
330 /* Was: "[[ ip ....%gateway% ]]". Removed extra spaces w/o checking */
331 result += execute("[[ip route add ::/0 via %gateway%]]", ifd, exec);
333 result = execute("ifconfig %iface%[[ media %media%]][[ hw %hwaddress%]][[ mtu %mtu%]] up", ifd, exec);
334 result += execute("ifconfig %iface% add %address%/%netmask%", ifd, exec);
335 result += execute("[[route -A inet6 add ::/0 gw %gateway%]]", ifd, exec);
337 return ((result == 3) ? 3 : 0);
340 static int static_down6(struct interface_defn_t *ifd, execfn *exec)
342 #if ENABLE_FEATURE_IFUPDOWN_IP
343 return execute("ip link set %iface% down", ifd, exec);
345 return execute("ifconfig %iface% down", ifd, exec);
349 #if ENABLE_FEATURE_IFUPDOWN_IP
350 static int v4tunnel_up(struct interface_defn_t *ifd, execfn *exec)
353 result = execute("ip tunnel add %iface% mode sit remote "
354 "%endpoint%[[ local %local%]][[ ttl %ttl%]]", ifd, exec);
355 result += execute("ip link set %iface% up", ifd, exec);
356 result += execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec);
357 result += execute("[[ip route add ::/0 via %gateway%]]", ifd, exec);
358 return ((result == 4) ? 4 : 0);
361 static int v4tunnel_down(struct interface_defn_t * ifd, execfn * exec)
363 return execute("ip tunnel del %iface%", ifd, exec);
367 static const struct method_t methods6[] = {
368 #if ENABLE_FEATURE_IFUPDOWN_IP
369 { "v4tunnel", v4tunnel_up, v4tunnel_down, },
371 { "static", static_up6, static_down6, },
372 { "loopback", loopback_up6, loopback_down6, },
375 static const struct address_family_t addr_inet6 = {
377 sizeof(methods6) / sizeof(struct method_t),
380 #endif /* FEATURE_IFUPDOWN_IPV6 */
382 #if ENABLE_FEATURE_IFUPDOWN_IPV4
383 static int loopback_up(struct interface_defn_t *ifd, execfn *exec)
385 #if ENABLE_FEATURE_IFUPDOWN_IP
387 result = execute("ip addr add 127.0.0.1/8 dev %iface%", ifd, exec);
388 result += execute("ip link set %iface% up", ifd, exec);
389 return ((result == 2) ? 2 : 0);
391 return execute("ifconfig %iface% 127.0.0.1 up", ifd, exec);
395 static int loopback_down(struct interface_defn_t *ifd, execfn *exec)
397 #if ENABLE_FEATURE_IFUPDOWN_IP
399 result = execute("ip addr flush dev %iface%", ifd, exec);
400 result += execute("ip link set %iface% down", ifd, exec);
401 return ((result == 2) ? 2 : 0);
403 return execute("ifconfig %iface% 127.0.0.1 down", ifd, exec);
407 static int static_up(struct interface_defn_t *ifd, execfn *exec)
410 #if ENABLE_FEATURE_IFUPDOWN_IP
411 result = execute("ip addr add %address%/%bnmask%[[ broadcast %broadcast%]] "
412 "dev %iface%[[ peer %pointopoint%]][[ label %label%]]", ifd, exec);
413 result += execute("ip link set[[ mtu %mtu%]][[ address %hwaddress%]] %iface% up", ifd, exec);
414 result += execute("[[ip route add default via %gateway% dev %iface%]]", ifd, exec);
415 return ((result == 3) ? 3 : 0);
417 /* ifconfig said to set iface up before it processes hw %hwaddress%,
418 * which then of course fails. Thus we run two separate ifconfig */
419 result = execute("ifconfig %iface%[[ hw %hwaddress%]][[ media %media%]][[ mtu %mtu%]] up",
421 result += execute("ifconfig %iface% %address% netmask %netmask%"
422 "[[ broadcast %broadcast%]][[ pointopoint %pointopoint%]] ",
424 result += execute("[[route add default gw %gateway% %iface%]]", ifd, exec);
425 return ((result == 3) ? 3 : 0);
429 static int static_down(struct interface_defn_t *ifd, execfn *exec)
432 #if ENABLE_FEATURE_IFUPDOWN_IP
433 result = execute("ip addr flush dev %iface%", ifd, exec);
434 result += execute("ip link set %iface% down", ifd, exec);
436 result = execute("[[route del default gw %gateway% %iface%]]", ifd, exec);
437 result += execute("ifconfig %iface% down", ifd, exec);
439 return ((result == 2) ? 2 : 0);
442 #if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
446 const char *startcmd;
450 static const struct dhcp_client_t ext_dhcp_clients[] = {
452 "dhcpcd[[ -h %hostname%]][[ -i %vendor%]][[ -I %clientid%]][[ -l %leasetime%]] %iface%",
456 "dhclient -pf /var/run/dhclient.%iface%.pid %iface%",
457 "kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null",
460 "pump -i %iface%[[ -h %hostname%]][[ -l %leasehours%]]",
461 "pump -i %iface% -k",
464 "udhcpc -R -n -p /var/run/udhcpc.%iface%.pid -i %iface%[[ -H %hostname%]][[ -c %clientid%]][[ -s %script%]]",
465 "kill -TERM `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
468 #endif /* ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCPC */
470 static int dhcp_up(struct interface_defn_t *ifd, execfn *exec)
472 #if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
473 int i, nclients = sizeof(ext_dhcp_clients) / sizeof(ext_dhcp_clients[0]);
474 for (i = 0; i < nclients; i++) {
475 if (exists_execable(ext_dhcp_clients[i].name))
476 return execute(ext_dhcp_clients[i].startcmd, ifd, exec);
478 bb_error_msg("no dhcp clients found");
480 #elif ENABLE_APP_UDHCPC
481 return execute("udhcpc -R -n -p /var/run/udhcpc.%iface%.pid "
482 "-i %iface%[[ -H %hostname%]][[ -c %clientid%]][[ -s %script%]]",
485 return 0; /* no dhcp support */
489 static int dhcp_down(struct interface_defn_t *ifd, execfn *exec)
491 #if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
492 int i, nclients = sizeof(ext_dhcp_clients) / sizeof(ext_dhcp_clients[0]);
493 for (i = 0; i < nclients; i++) {
494 if (exists_execable(ext_dhcp_clients[i].name))
495 return execute(ext_dhcp_clients[i].stopcmd, ifd, exec);
497 bb_error_msg("no dhcp clients found, using static interface shutdown");
498 return static_down(ifd, exec);
499 #elif ENABLE_APP_UDHCPC
500 return execute("kill -TERM "
501 "`cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec);
503 return 0; /* no support for dhcp */
507 static int manual_up_down(struct interface_defn_t *ifd, execfn *exec)
512 static int bootp_up(struct interface_defn_t *ifd, execfn *exec)
514 return execute("bootpc[[ --bootfile %bootfile%]] --dev %iface%"
515 "[[ --server %server%]][[ --hwaddr %hwaddr%]] "
516 "--returniffail --serverbcast", ifd, exec);
519 static int ppp_up(struct interface_defn_t *ifd, execfn *exec)
521 return execute("pon[[ %provider%]]", ifd, exec);
524 static int ppp_down(struct interface_defn_t *ifd, execfn *exec)
526 return execute("poff[[ %provider%]]", ifd, exec);
529 static int wvdial_up(struct interface_defn_t *ifd, execfn *exec)
531 return execute("start-stop-daemon --start -x wvdial "
532 "-p /var/run/wvdial.%iface% -b -m --[[ %provider%]]", ifd, exec);
535 static int wvdial_down(struct interface_defn_t *ifd, execfn *exec)
537 return execute("start-stop-daemon --stop -x wvdial "
538 "-p /var/run/wvdial.%iface% -s 2", ifd, exec);
541 static const struct method_t methods[] = {
542 { "manual", manual_up_down, manual_up_down, },
543 { "wvdial", wvdial_up, wvdial_down, },
544 { "ppp", ppp_up, ppp_down, },
545 { "static", static_up, static_down, },
546 { "bootp", bootp_up, static_down, },
547 { "dhcp", dhcp_up, dhcp_down, },
548 { "loopback", loopback_up, loopback_down, },
551 static const struct address_family_t addr_inet = {
553 sizeof(methods) / sizeof(methods[0]),
557 #endif /* if ENABLE_FEATURE_IFUPDOWN_IPV4 */
559 static char *next_word(char **buf)
561 unsigned short length;
564 if (!buf || !*buf || !**buf) {
568 /* Skip over leading whitespace */
569 word = skip_whitespace(*buf);
571 /* Skip over comments */
576 /* Find the length of this word */
577 length = strcspn(word, " \t\n");
581 *buf = word + length;
582 /*DBU:[dave@cray.com] if we are already at EOL dont't increment beyond it */
591 static const struct address_family_t *get_address_family(const struct address_family_t *const af[], char *name)
598 for (i = 0; af[i]; i++) {
599 if (strcmp(af[i]->name, name) == 0) {
606 static const struct method_t *get_method(const struct address_family_t *af, char *name)
613 for (i = 0; i < af->n_methods; i++) {
614 if (strcmp(af->method[i].name, name) == 0) {
615 return &af->method[i];
621 static const llist_t *find_list_string(const llist_t *list, const char *string)
627 if (strcmp(list->data, string) == 0) {
635 static struct interfaces_file_t *read_interfaces(const char *filename)
637 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
638 struct mapping_defn_t *currmap = NULL;
640 struct interface_defn_t *currif = NULL;
641 struct interfaces_file_t *defn;
646 enum { NONE, IFACE, MAPPING } currently_processing = NONE;
648 defn = xzalloc(sizeof(struct interfaces_file_t));
650 f = xfopen(filename, "r");
652 while ((buf = xmalloc_getline(f)) != NULL) {
655 firstword = next_word(&buf_ptr);
656 if (firstword == NULL) {
658 continue; /* blank line */
661 if (strcmp(firstword, "mapping") == 0) {
662 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
663 currmap = xzalloc(sizeof(struct mapping_defn_t));
665 while ((firstword = next_word(&buf_ptr)) != NULL) {
666 if (currmap->max_matches == currmap->n_matches) {
667 currmap->max_matches = currmap->max_matches * 2 + 1;
668 currmap->match = xrealloc(currmap->match, sizeof(currmap->match) * currmap->max_matches);
671 currmap->match[currmap->n_matches++] = xstrdup(firstword);
673 currmap->max_mappings = 0;
674 currmap->n_mappings = 0;
675 currmap->mapping = NULL;
676 currmap->script = NULL;
678 struct mapping_defn_t **where = &defn->mappings;
679 while (*where != NULL) {
680 where = &(*where)->next;
683 currmap->next = NULL;
685 debug_noise("Added mapping\n");
687 currently_processing = MAPPING;
688 } else if (strcmp(firstword, "iface") == 0) {
689 static const struct address_family_t *const addr_fams[] = {
690 #if ENABLE_FEATURE_IFUPDOWN_IPV4
693 #if ENABLE_FEATURE_IFUPDOWN_IPV6
700 char *address_family_name;
704 currif = xzalloc(sizeof(struct interface_defn_t));
705 iface_name = next_word(&buf_ptr);
706 address_family_name = next_word(&buf_ptr);
707 method_name = next_word(&buf_ptr);
709 if (buf_ptr == NULL) {
710 bb_error_msg("too few parameters for line \"%s\"", buf);
714 /* ship any trailing whitespace */
715 buf_ptr = skip_whitespace(buf_ptr);
717 if (buf_ptr[0] != '\0') {
718 bb_error_msg("too many parameters \"%s\"", buf);
722 currif->iface = xstrdup(iface_name);
724 currif->address_family = get_address_family(addr_fams, address_family_name);
725 if (!currif->address_family) {
726 bb_error_msg("unknown address type \"%s\"", address_family_name);
730 currif->method = get_method(currif->address_family, method_name);
731 if (!currif->method) {
732 bb_error_msg("unknown method \"%s\"", method_name);
736 for (iface_list = defn->ifaces; iface_list; iface_list = iface_list->link) {
737 struct interface_defn_t *tmp = (struct interface_defn_t *) iface_list->data;
738 if ((strcmp(tmp->iface, currif->iface) == 0) &&
739 (tmp->address_family == currif->address_family)) {
740 bb_error_msg("duplicate interface \"%s\"", tmp->iface);
744 llist_add_to_end(&(defn->ifaces), (char*)currif);
746 debug_noise("iface %s %s %s\n", currif->iface, address_family_name, method_name);
747 currently_processing = IFACE;
748 } else if (strcmp(firstword, "auto") == 0) {
749 while ((firstword = next_word(&buf_ptr)) != NULL) {
751 /* Check the interface isnt already listed */
752 if (find_list_string(defn->autointerfaces, firstword)) {
753 bb_perror_msg_and_die("interface declared auto twice \"%s\"", buf);
756 /* Add the interface to the list */
757 llist_add_to_end(&(defn->autointerfaces), xstrdup(firstword));
758 debug_noise("\nauto %s\n", firstword);
760 currently_processing = NONE;
762 switch (currently_processing) {
767 if (strlen(buf_ptr) == 0) {
768 bb_error_msg("option with empty value \"%s\"", buf);
772 if (strcmp(firstword, "up") != 0
773 && strcmp(firstword, "down") != 0
774 && strcmp(firstword, "pre-up") != 0
775 && strcmp(firstword, "post-down") != 0) {
776 for (i = 0; i < currif->n_options; i++) {
777 if (strcmp(currif->option[i].name, firstword) == 0) {
778 bb_error_msg("duplicate option \"%s\"", buf);
784 if (currif->n_options >= currif->max_options) {
785 struct variable_t *opt;
787 currif->max_options = currif->max_options + 10;
788 opt = xrealloc(currif->option, sizeof(*opt) * currif->max_options);
789 currif->option = opt;
791 currif->option[currif->n_options].name = xstrdup(firstword);
792 currif->option[currif->n_options].value = xstrdup(buf_ptr);
793 if (!currif->option[currif->n_options].name) {
797 if (!currif->option[currif->n_options].value) {
801 debug_noise("\t%s=%s\n", currif->option[currif->n_options].name,
802 currif->option[currif->n_options].value);
806 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
807 if (strcmp(firstword, "script") == 0) {
808 if (currmap->script != NULL) {
809 bb_error_msg("duplicate script in mapping \"%s\"", buf);
812 currmap->script = xstrdup(next_word(&buf_ptr));
814 } else if (strcmp(firstword, "map") == 0) {
815 if (currmap->max_mappings == currmap->n_mappings) {
816 currmap->max_mappings = currmap->max_mappings * 2 + 1;
817 currmap->mapping = xrealloc(currmap->mapping, sizeof(char *) * currmap->max_mappings);
819 currmap->mapping[currmap->n_mappings] = xstrdup(next_word(&buf_ptr));
820 currmap->n_mappings++;
822 bb_error_msg("misplaced option \"%s\"", buf);
829 bb_error_msg("misplaced option \"%s\"", buf);
835 if (ferror(f) != 0) {
836 bb_perror_msg_and_die("%s", filename);
843 static char *setlocalenv(const char *format, const char *name, const char *value)
849 result = xasprintf(format, name, value);
851 for (here = there = result; *there != '=' && *there; there++) {
855 *there = toupper(*there);
857 if (isalnum(*there) || *there == '_') {
862 memmove(here, there, strlen(there) + 1);
867 static void set_environ(struct interface_defn_t *iface, const char *mode)
871 const int n_env_entries = iface->n_options + 5;
874 if (my_environ != NULL) {
875 for (ppch = my_environ; *ppch; ppch++) {
881 my_environ = xzalloc(sizeof(char *) * (n_env_entries + 1 /* for final NULL */ ));
882 environend = my_environ;
884 for (i = 0; i < iface->n_options; i++) {
885 if (strcmp(iface->option[i].name, "up") == 0
886 || strcmp(iface->option[i].name, "down") == 0
887 || strcmp(iface->option[i].name, "pre-up") == 0
888 || strcmp(iface->option[i].name, "post-down") == 0) {
891 *(environend++) = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value);
894 *(environend++) = setlocalenv("%s=%s", "IFACE", iface->iface);
895 *(environend++) = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name);
896 *(environend++) = setlocalenv("%s=%s", "METHOD", iface->method->name);
897 *(environend++) = setlocalenv("%s=%s", "MODE", mode);
898 *(environend++) = setlocalenv("%s=%s", "PATH", startup_PATH);
901 static int doit(char *str)
903 if (option_mask32 & (OPT_no_act|OPT_verbose)) {
906 if (!(option_mask32 & OPT_no_act)) {
913 case -1: /* failure */
916 execle(DEFAULT_SHELL, DEFAULT_SHELL, "-c", str, NULL, my_environ);
919 waitpid(child, &status, 0);
920 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
927 static int execute_all(struct interface_defn_t *ifd, const char *opt)
931 for (i = 0; i < ifd->n_options; i++) {
932 if (strcmp(ifd->option[i].name, opt) == 0) {
933 if (!doit(ifd->option[i].value)) {
939 buf = xasprintf("run-parts /etc/network/if-%s.d", opt);
940 /* heh, we don't bother free'ing it */
944 static int check(char *str)
949 static int iface_up(struct interface_defn_t *iface)
951 if (!iface->method->up(iface, check)) return -1;
952 set_environ(iface, "start");
953 if (!execute_all(iface, "pre-up")) return 0;
954 if (!iface->method->up(iface, doit)) return 0;
955 if (!execute_all(iface, "up")) return 0;
959 static int iface_down(struct interface_defn_t *iface)
961 if (!iface->method->down(iface,check)) return -1;
962 set_environ(iface, "stop");
963 if (!execute_all(iface, "down")) return 0;
964 if (!iface->method->down(iface, doit)) return 0;
965 if (!execute_all(iface, "post-down")) return 0;
969 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
970 static int popen2(FILE **in, FILE **out, char *command, ...)
973 char *argv[11] = { command };
975 int infd[2], outfd[2];
979 va_start(ap, command);
980 while ((argc < 10) && (argv[argc] = va_arg(ap, char *))) {
983 argv[argc] = NULL; /* make sure */
986 if (pipe(infd) != 0) {
990 if (pipe(outfd) != 0) {
997 switch (pid = fork()) {
998 case -1: /* failure */
1011 BB_EXECVP(command, argv);
1013 default: /* parent */
1014 *in = fdopen(infd[1], "w");
1015 *out = fdopen(outfd[0], "r");
1023 static char *run_mapping(char *physical, struct mapping_defn_t * map)
1029 char *logical = xstrdup(physical);
1031 /* Run the mapping script. */
1032 pid = popen2(&in, &out, map->script, physical, NULL);
1034 /* popen2() returns 0 on failure. */
1038 /* Write mappings to stdin of mapping script. */
1039 for (i = 0; i < map->n_mappings; i++) {
1040 fprintf(in, "%s\n", map->mapping[i]);
1043 waitpid(pid, &status, 0);
1045 if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
1046 /* If the mapping script exited successfully, try to
1047 * grab a line of output and use that as the name of the
1048 * logical interface. */
1049 char *new_logical = xmalloc(MAX_INTERFACE_LENGTH);
1051 if (fgets(new_logical, MAX_INTERFACE_LENGTH, out)) {
1052 /* If we are able to read a line of output from the script,
1053 * remove any trailing whitespace and use this value
1054 * as the name of the logical interface. */
1055 char *pch = new_logical + strlen(new_logical) - 1;
1057 while (pch >= new_logical && isspace(*pch))
1061 logical = new_logical;
1063 /* If we are UNABLE to read a line of output, discard our
1064 * freshly allocated memory. */
1073 #endif /* FEATURE_IFUPDOWN_MAPPING */
1075 static llist_t *find_iface_state(llist_t *state_list, const char *iface)
1077 unsigned short iface_len = strlen(iface);
1078 llist_t *search = state_list;
1081 if ((strncmp(search->data, iface, iface_len) == 0)
1082 && (search->data[iface_len] == '=')) {
1085 search = search->link;
1090 /* read the previous state from the state file */
1091 static llist_t *read_iface_state(void)
1093 llist_t *state_list = NULL;
1094 FILE *state_fp = fopen("/var/run/ifstate", "r");
1097 char *start, *end_ptr;
1098 while ((start = xmalloc_fgets(state_fp)) != NULL) {
1099 /* We should only need to check for a single character */
1100 end_ptr = start + strcspn(start, " \t\n");
1102 llist_add_to(&state_list, start);
1110 int ifupdown_main(int argc, char **argv);
1111 int ifupdown_main(int argc, char **argv)
1113 int (*cmds)(struct interface_defn_t *) = NULL;
1114 struct interfaces_file_t *defn;
1115 llist_t *target_list = NULL;
1116 const char *interfaces = "/etc/network/interfaces";
1117 bool any_failures = 0;
1120 if (applet_name[2] == 'u') {
1125 getopt32(argc, argv, OPTION_STR, &interfaces);
1126 if (argc - optind > 0) {
1127 if (DO_ALL) bb_show_usage();
1129 if (!DO_ALL) bb_show_usage();
1132 debug_noise("reading %s file:\n", interfaces);
1133 defn = read_interfaces(interfaces);
1134 debug_noise("\ndone reading %s\n\n", interfaces);
1137 return EXIT_FAILURE;
1140 startup_PATH = getenv("PATH");
1141 if (!startup_PATH) startup_PATH = "";
1143 /* Create a list of interfaces to work on */
1145 target_list = defn->autointerfaces;
1147 llist_add_to_end(&target_list, argv[optind]);
1150 /* Update the interfaces */
1151 while (target_list) {
1152 llist_t *iface_list;
1153 struct interface_defn_t *currif;
1160 iface = xstrdup(target_list->data);
1161 target_list = target_list->link;
1163 pch = strchr(iface, '=');
1166 liface = xstrdup(pch + 1);
1168 liface = xstrdup(iface);
1172 llist_t *state_list = read_iface_state();
1173 const llist_t *iface_state = find_iface_state(state_list, iface);
1175 if (cmds == iface_up) {
1178 bb_error_msg("interface %s already configured", iface);
1184 bb_error_msg("interface %s not configured", iface);
1188 llist_free(state_list, free);
1191 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
1192 if ((cmds == iface_up) && !NO_MAPPINGS) {
1193 struct mapping_defn_t *currmap;
1195 for (currmap = defn->mappings; currmap; currmap = currmap->next) {
1197 for (i = 0; i < currmap->n_matches; i++) {
1198 if (fnmatch(currmap->match[i], liface, 0) != 0)
1201 printf("Running mapping script %s on %s\n", currmap->script, liface);
1203 liface = run_mapping(iface, currmap);
1210 iface_list = defn->ifaces;
1211 while (iface_list) {
1212 currif = (struct interface_defn_t *) iface_list->data;
1213 if (strcmp(liface, currif->iface) == 0) {
1214 char *oldiface = currif->iface;
1217 currif->iface = iface;
1219 debug_noise("\nConfiguring interface %s (%s)\n", liface, currif->address_family->name);
1221 /* Call the cmds function pointer, does either iface_up() or iface_down() */
1222 cmds_ret = cmds(currif);
1223 if (cmds_ret == -1) {
1224 bb_error_msg("don't seem to have all the variables for %s/%s",
1225 liface, currif->address_family->name);
1227 } else if (cmds_ret == 0) {
1231 currif->iface = oldiface;
1233 iface_list = iface_list->link;
1239 if (!okay && !FORCE) {
1240 bb_error_msg("ignoring unknown interface %s", liface);
1243 /* update the state file */
1244 llist_t *state_list = read_iface_state();
1245 llist_t *iface_state = find_iface_state(state_list, iface);
1247 if (cmds == iface_up) {
1248 char * const newiface = xasprintf("%s=%s", iface, liface);
1249 if (iface_state == NULL) {
1250 llist_add_to_end(&state_list, newiface);
1252 free(iface_state->data);
1253 iface_state->data = newiface;
1256 /* Remove an interface from state_list */
1257 llist_unlink(&state_list, iface_state);
1258 free(llist_pop(&iface_state));
1261 /* Actually write the new state */
1263 FILE *state_fp = xfopen("/var/run/ifstate", "w");
1264 llist_t *state = state_list;
1267 fprintf(state_fp, "%s\n", state->data);
1269 state = state->link;
1273 llist_free(state_list, free);
1277 return any_failures;