1 /* vi: set sw=4 ts=4: */
4 * Copyright (c) 2002 Glenn McGrath
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
14 * (defined via CONFIG_IFUPDOWN_IFSTATE_PATH) and can be overridden by build
17 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
20 #include <sys/utsname.h>
25 #define MAX_OPT_DEPTH 10
26 #define EUNBALBRACK 10001
27 #define EUNDEFVAR 10002
28 #define EUNBALPER 10000
30 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
31 #define MAX_INTERFACE_LENGTH 10
34 #define debug_noise(args...) /*fprintf(stderr, args)*/
36 /* Forward declaration */
37 struct interface_defn_t;
39 typedef int execfn(char *command);
43 int (*up)(struct interface_defn_t *ifd, execfn *e);
44 int (*down)(struct interface_defn_t *ifd, execfn *e);
47 struct address_family_t {
50 const struct method_t *method;
53 struct mapping_defn_t {
54 struct mapping_defn_t *next;
72 struct interface_defn_t {
73 const struct address_family_t *address_family;
74 const struct method_t *method;
79 struct variable_t *option;
82 struct interfaces_file_t {
83 llist_t *autointerfaces;
85 struct mapping_defn_t *mappings;
88 #define OPTION_STR "anvf" USE_FEATURE_IFUPDOWN_MAPPING("m") "i:"
94 OPT_no_mappings = 0x10,
96 #define DO_ALL (option_mask32 & OPT_do_all)
97 #define NO_ACT (option_mask32 & OPT_no_act)
98 #define VERBOSE (option_mask32 & OPT_verbose)
99 #define FORCE (option_mask32 & OPT_force)
100 #define NO_MAPPINGS (option_mask32 & OPT_no_mappings)
102 static char **my_environ;
104 static const char *startup_PATH;
106 #if ENABLE_FEATURE_IFUPDOWN_IPV4 || ENABLE_FEATURE_IFUPDOWN_IPV6
108 static void addstr(char **bufp, const char *str, size_t str_length)
110 /* xasprintf trick will be smaller, but we are often
111 * called with str_length == 1 - don't want to have
112 * THAT much of malloc/freeing! */
114 int len = (buf ? strlen(buf) : 0);
116 buf = xrealloc(buf, len + str_length);
117 /* copies at most str_length-1 chars! */
118 safe_strncpy(buf + len, str, str_length);
122 static int strncmpz(const char *l, const char *r, size_t llen)
124 int i = strncmp(l, r, llen);
131 static char *get_var(const char *id, size_t idlen, struct interface_defn_t *ifd)
135 if (strncmpz(id, "iface", idlen) == 0) {
136 static char *label_buf;
140 label_buf = xstrdup(ifd->iface);
141 // Remove virtual iface suffix - why?
142 // ubuntu's ifup doesn't do this
143 //result = strchrnul(label_buf, ':');
147 if (strncmpz(id, "label", idlen) == 0) {
150 for (i = 0; i < ifd->n_options; i++) {
151 if (strncmpz(id, ifd->option[i].name, idlen) == 0) {
152 return ifd->option[i].value;
158 #if ENABLE_FEATURE_IFUPDOWN_IP
159 static int count_netmask_bits(const char *dotted_quad)
162 // unsigned a, b, c, d;
163 // /* Found a netmask... Check if it is dotted quad */
164 // if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) != 4)
166 // if ((a|b|c|d) >> 8)
167 // return -1; /* one of numbers is >= 256 */
168 // d |= (a << 24) | (b << 16) | (c << 8); /* IP */
169 // d = ~d; /* 11110000 -> 00001111 */
171 /* Shorter version */
176 if (inet_aton(dotted_quad, &ip) == 0)
177 return -1; /* malformed dotted IP */
178 d = ntohl(ip.s_addr); /* IP in host order */
179 d = ~d; /* 11110000 -> 00001111 */
180 if (d & (d+1)) /* check that it is in 00001111 form */
181 return -1; /* no it is not */
191 static char *parse(const char *command, struct interface_defn_t *ifd)
193 size_t old_pos[MAX_OPT_DEPTH] = { 0 };
194 int okay[MAX_OPT_DEPTH] = { 1 };
201 addstr(&result, command, 1);
206 addstr(&result, command + 1, 1);
209 addstr(&result, command, 1);
214 if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) {
215 old_pos[opt_depth] = result ? strlen(result) : 0;
220 addstr(&result, "[", 1);
225 if (command[1] == ']' && opt_depth > 1) {
227 if (!okay[opt_depth]) {
228 result[old_pos[opt_depth]] = '\0';
232 addstr(&result, "]", 1);
242 nextpercent = strchr(command, '%');
249 varvalue = get_var(command, nextpercent - command, ifd);
252 #if ENABLE_FEATURE_IFUPDOWN_IP
253 /* "hwaddress <class> <address>":
254 * unlike ifconfig, ip doesnt want <class>
255 * (usually "ether" keyword). Skip it. */
256 if (strncmp(command, "hwaddress", 9) == 0) {
257 varvalue = skip_whitespace(skip_non_whitespace(varvalue));
260 addstr(&result, varvalue, strlen(varvalue));
262 #if ENABLE_FEATURE_IFUPDOWN_IP
263 /* Sigh... Add a special case for 'ip' to convert from
264 * dotted quad to bit count style netmasks. */
265 if (strncmp(command, "bnmask", 6) == 0) {
267 varvalue = get_var("netmask", 7, ifd);
269 res = count_netmask_bits(varvalue);
271 const char *argument = utoa(res);
272 addstr(&result, argument, strlen(argument));
273 command = nextpercent + 1;
279 okay[opt_depth - 1] = 0;
282 command = nextpercent + 1;
303 /* execute() returns 1 for success and 0 for failure */
304 static int execute(const char *command, struct interface_defn_t *ifd, execfn *exec)
309 out = parse(command, ifd);
314 /* out == "": parsed ok but not all needed variables known, skip */
315 ret = out[0] ? (*exec)(out) : 1;
325 #if ENABLE_FEATURE_IFUPDOWN_IPV6
326 static int loopback_up6(struct interface_defn_t *ifd, execfn *exec)
328 #if ENABLE_FEATURE_IFUPDOWN_IP
330 result = execute("ip addr add ::1 dev %iface%", ifd, exec);
331 result += execute("ip link set %iface% up", ifd, exec);
332 return ((result == 2) ? 2 : 0);
334 return execute("ifconfig %iface% add ::1", ifd, exec);
338 static int loopback_down6(struct interface_defn_t *ifd, execfn *exec)
340 #if ENABLE_FEATURE_IFUPDOWN_IP
341 return execute("ip link set %iface% down", ifd, exec);
343 return execute("ifconfig %iface% del ::1", ifd, exec);
347 static int static_up6(struct interface_defn_t *ifd, execfn *exec)
350 #if ENABLE_FEATURE_IFUPDOWN_IP
351 result = execute("ip addr add %address%/%netmask% dev %iface%[[ label %label%]]", ifd, exec);
352 result += execute("ip link set[[ mtu %mtu%]][[ address %hwaddress%]] %iface% up", ifd, exec);
353 /* Was: "[[ ip ....%gateway% ]]". Removed extra spaces w/o checking */
354 result += execute("[[ip route add ::/0 via %gateway%]]", ifd, exec);
356 result = execute("ifconfig %iface%[[ media %media%]][[ hw %hwaddress%]][[ mtu %mtu%]] up", ifd, exec);
357 result += execute("ifconfig %iface% add %address%/%netmask%", ifd, exec);
358 result += execute("[[route -A inet6 add ::/0 gw %gateway%]]", ifd, exec);
360 return ((result == 3) ? 3 : 0);
363 static int static_down6(struct interface_defn_t *ifd, execfn *exec)
365 #if ENABLE_FEATURE_IFUPDOWN_IP
366 return execute("ip link set %iface% down", ifd, exec);
368 return execute("ifconfig %iface% down", ifd, exec);
372 #if ENABLE_FEATURE_IFUPDOWN_IP
373 static int v4tunnel_up(struct interface_defn_t *ifd, execfn *exec)
376 result = execute("ip tunnel add %iface% mode sit remote "
377 "%endpoint%[[ local %local%]][[ ttl %ttl%]]", ifd, exec);
378 result += execute("ip link set %iface% up", ifd, exec);
379 result += execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec);
380 result += execute("[[ip route add ::/0 via %gateway%]]", ifd, exec);
381 return ((result == 4) ? 4 : 0);
384 static int v4tunnel_down(struct interface_defn_t * ifd, execfn * exec)
386 return execute("ip tunnel del %iface%", ifd, exec);
390 static const struct method_t methods6[] = {
391 #if ENABLE_FEATURE_IFUPDOWN_IP
392 { "v4tunnel", v4tunnel_up, v4tunnel_down, },
394 { "static", static_up6, static_down6, },
395 { "loopback", loopback_up6, loopback_down6, },
398 static const struct address_family_t addr_inet6 = {
400 ARRAY_SIZE(methods6),
403 #endif /* FEATURE_IFUPDOWN_IPV6 */
405 #if ENABLE_FEATURE_IFUPDOWN_IPV4
406 static int loopback_up(struct interface_defn_t *ifd, execfn *exec)
408 #if ENABLE_FEATURE_IFUPDOWN_IP
410 result = execute("ip addr add 127.0.0.1/8 dev %iface%", ifd, exec);
411 result += execute("ip link set %iface% up", ifd, exec);
412 return ((result == 2) ? 2 : 0);
414 return execute("ifconfig %iface% 127.0.0.1 up", ifd, exec);
418 static int loopback_down(struct interface_defn_t *ifd, execfn *exec)
420 #if ENABLE_FEATURE_IFUPDOWN_IP
422 result = execute("ip addr flush dev %iface%", ifd, exec);
423 result += execute("ip link set %iface% down", ifd, exec);
424 return ((result == 2) ? 2 : 0);
426 return execute("ifconfig %iface% 127.0.0.1 down", ifd, exec);
430 static int static_up(struct interface_defn_t *ifd, execfn *exec)
433 #if ENABLE_FEATURE_IFUPDOWN_IP
434 result = execute("ip addr add %address%/%bnmask%[[ broadcast %broadcast%]] "
435 "dev %iface%[[ peer %pointopoint%]][[ label %label%]]", ifd, exec);
436 result += execute("ip link set[[ mtu %mtu%]][[ address %hwaddress%]] %iface% up", ifd, exec);
437 result += execute("[[ip route add default via %gateway% dev %iface%]]", ifd, exec);
438 return ((result == 3) ? 3 : 0);
440 /* ifconfig said to set iface up before it processes hw %hwaddress%,
441 * which then of course fails. Thus we run two separate ifconfig */
442 result = execute("ifconfig %iface%[[ hw %hwaddress%]][[ media %media%]][[ mtu %mtu%]] up",
444 result += execute("ifconfig %iface% %address% netmask %netmask%"
445 "[[ broadcast %broadcast%]][[ pointopoint %pointopoint%]] ",
447 result += execute("[[route add default gw %gateway% %iface%]]", ifd, exec);
448 return ((result == 3) ? 3 : 0);
452 static int static_down(struct interface_defn_t *ifd, execfn *exec)
455 #if ENABLE_FEATURE_IFUPDOWN_IP
456 result = execute("ip addr flush dev %iface%", ifd, exec);
457 result += execute("ip link set %iface% down", ifd, exec);
459 /* result = execute("[[route del default gw %gateway% %iface%]]", ifd, exec); */
460 /* Bringing the interface down deletes the routes in itself.
461 Otherwise this fails if we reference 'gateway' when using this from dhcp_down */
463 result += execute("ifconfig %iface% down", ifd, exec);
465 return ((result == 2) ? 2 : 0);
468 #if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
472 const char *startcmd;
476 static const struct dhcp_client_t ext_dhcp_clients[] = {
478 "dhcpcd[[ -h %hostname%]][[ -i %vendor%]][[ -I %clientid%]][[ -l %leasetime%]] %iface%",
482 "dhclient -pf /var/run/dhclient.%iface%.pid %iface%",
483 "kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null",
486 "pump -i %iface%[[ -h %hostname%]][[ -l %leasehours%]]",
487 "pump -i %iface% -k",
490 "udhcpc -R -n -p /var/run/udhcpc.%iface%.pid -i %iface%[[ -H %hostname%]][[ -c %clientid%]]"
491 "[[ -s %script%]][[ %udhcpc_opts%]]",
492 "kill `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
495 #endif /* ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCPC */
497 #if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
498 static int dhcp_up(struct interface_defn_t *ifd, execfn *exec)
501 #if ENABLE_FEATURE_IFUPDOWN_IP
502 /* ip doesn't up iface when it configures it (unlike ifconfig) */
503 if (!execute("ip link set[[ address %hwaddress%]] %iface% up", ifd, exec))
506 /* needed if we have hwaddress on dhcp iface */
507 if (!execute("ifconfig %iface%[[ hw %hwaddress%]] up", ifd, exec))
510 for (i = 0; i < ARRAY_SIZE(ext_dhcp_clients); i++) {
511 if (exists_execable(ext_dhcp_clients[i].name))
512 return execute(ext_dhcp_clients[i].startcmd, ifd, exec);
514 bb_error_msg("no dhcp clients found");
517 #elif ENABLE_APP_UDHCPC
518 static int dhcp_up(struct interface_defn_t *ifd, execfn *exec)
520 #if ENABLE_FEATURE_IFUPDOWN_IP
521 /* ip doesn't up iface when it configures it (unlike ifconfig) */
522 if (!execute("ip link set[[ address %hwaddress%]] %iface% up", ifd, exec))
525 /* needed if we have hwaddress on dhcp iface */
526 if (!execute("ifconfig %iface%[[ hw %hwaddress%]] up", ifd, exec))
529 return execute("udhcpc -R -n -p /var/run/udhcpc.%iface%.pid "
530 "-i %iface%[[ -H %hostname%]][[ -c %clientid%]][[ -s %script%]][[ %udhcpc_opts%]]",
534 static int dhcp_up(struct interface_defn_t *ifd UNUSED_PARAM,
535 execfn *exec UNUSED_PARAM)
537 return 0; /* no dhcp support */
541 #if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
542 static int dhcp_down(struct interface_defn_t *ifd, execfn *exec)
547 for (i = 0; i < ARRAY_SIZE(ext_dhcp_clients); i++) {
548 if (exists_execable(ext_dhcp_clients[i].name)) {
549 result += execute(ext_dhcp_clients[i].stopcmd, ifd, exec);
556 bb_error_msg("warning: no dhcp clients found and stopped");
558 /* Sleep a bit, otherwise static_down tries to bring down interface too soon,
559 and it may come back up because udhcpc is still shutting down */
561 result += static_down(ifd, exec);
562 return ((result == 3) ? 3 : 0);
564 #elif ENABLE_APP_UDHCPC
565 static int dhcp_down(struct interface_defn_t *ifd, execfn *exec)
568 result = execute("kill "
569 "`cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec);
570 /* Also bring the hardware interface down since
571 killing the dhcp client alone doesn't do it.
572 This enables consecutive ifup->ifdown->ifup */
573 /* Sleep a bit, otherwise static_down tries to bring down interface too soon,
574 and it may come back up because udhcpc is still shutting down */
576 result += static_down(ifd, exec);
577 return ((result == 3) ? 3 : 0);
580 static int dhcp_down(struct interface_defn_t *ifd UNUSED_PARAM,
581 execfn *exec UNUSED_PARAM)
583 return 0; /* no dhcp support */
587 static int manual_up_down(struct interface_defn_t *ifd UNUSED_PARAM, execfn *exec UNUSED_PARAM)
592 static int bootp_up(struct interface_defn_t *ifd, execfn *exec)
594 return execute("bootpc[[ --bootfile %bootfile%]] --dev %iface%"
595 "[[ --server %server%]][[ --hwaddr %hwaddr%]]"
596 " --returniffail --serverbcast", ifd, exec);
599 static int ppp_up(struct interface_defn_t *ifd, execfn *exec)
601 return execute("pon[[ %provider%]]", ifd, exec);
604 static int ppp_down(struct interface_defn_t *ifd, execfn *exec)
606 return execute("poff[[ %provider%]]", ifd, exec);
609 static int wvdial_up(struct interface_defn_t *ifd, execfn *exec)
611 return execute("start-stop-daemon --start -x wvdial "
612 "-p /var/run/wvdial.%iface% -b -m --[[ %provider%]]", ifd, exec);
615 static int wvdial_down(struct interface_defn_t *ifd, execfn *exec)
617 return execute("start-stop-daemon --stop -x wvdial "
618 "-p /var/run/wvdial.%iface% -s 2", ifd, exec);
621 static const struct method_t methods[] = {
622 { "manual", manual_up_down, manual_up_down, },
623 { "wvdial", wvdial_up, wvdial_down, },
624 { "ppp", ppp_up, ppp_down, },
625 { "static", static_up, static_down, },
626 { "bootp", bootp_up, static_down, },
627 { "dhcp", dhcp_up, dhcp_down, },
628 { "loopback", loopback_up, loopback_down, },
631 static const struct address_family_t addr_inet = {
637 #endif /* if ENABLE_FEATURE_IFUPDOWN_IPV4 */
639 static char *next_word(char **buf)
644 /* Skip over leading whitespace */
645 word = skip_whitespace(*buf);
651 /* Find the length of this word (can't be 0) */
652 length = strcspn(word, " \t\n");
654 /* Unless we are already at NUL, store NUL and advance */
655 if (word[length] != '\0')
656 word[length++] = '\0';
658 *buf = word + length;
663 static const struct address_family_t *get_address_family(const struct address_family_t *const af[], char *name)
670 for (i = 0; af[i]; i++) {
671 if (strcmp(af[i]->name, name) == 0) {
678 static const struct method_t *get_method(const struct address_family_t *af, char *name)
684 /* TODO: use index_in_str_array() */
685 for (i = 0; i < af->n_methods; i++) {
686 if (strcmp(af->method[i].name, name) == 0) {
687 return &af->method[i];
693 static const llist_t *find_list_string(const llist_t *list, const char *string)
699 if (strcmp(list->data, string) == 0) {
707 static struct interfaces_file_t *read_interfaces(const char *filename)
709 /* Let's try to be compatible.
711 * "man 5 interfaces" says:
712 * Lines starting with "#" are ignored. Note that end-of-line
713 * comments are NOT supported, comments must be on a line of their own.
714 * A line may be extended across multiple lines by making
715 * the last character a backslash.
717 * Seen elsewhere in example config file:
718 * A first non-blank "#" character makes the rest of the line
719 * be ignored. Blank lines are ignored. Lines may be indented freely.
720 * A "\" character at the very end of the line indicates the next line
721 * should be treated as a continuation of the current one.
723 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
724 struct mapping_defn_t *currmap = NULL;
726 struct interface_defn_t *currif = NULL;
727 struct interfaces_file_t *defn;
732 enum { NONE, IFACE, MAPPING } currently_processing = NONE;
734 defn = xzalloc(sizeof(*defn));
735 f = xfopen_for_read(filename);
737 while ((buf = xmalloc_fgetline(f)) != NULL) {
739 /* Trailing "\" concatenates lines */
741 while ((p = last_char_is(buf, '\\')) != NULL) {
743 rest_of_line = xmalloc_fgetline(f);
746 p = xasprintf("%s%s", buf, rest_of_line);
753 first_word = next_word(&rest_of_line);
754 if (!first_word || *first_word == '#') {
756 continue; /* blank/comment line */
759 if (strcmp(first_word, "mapping") == 0) {
760 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
761 currmap = xzalloc(sizeof(*currmap));
763 while ((first_word = next_word(&rest_of_line)) != NULL) {
764 currmap->match = xrealloc_vector(currmap->match, 4, currmap->n_matches);
765 currmap->match[currmap->n_matches++] = xstrdup(first_word);
767 /*currmap->max_mappings = 0; - done by xzalloc */
768 /*currmap->n_mappings = 0;*/
769 /*currmap->mapping = NULL;*/
770 /*currmap->script = NULL;*/
772 struct mapping_defn_t **where = &defn->mappings;
773 while (*where != NULL) {
774 where = &(*where)->next;
777 /*currmap->next = NULL;*/
779 debug_noise("Added mapping\n");
781 currently_processing = MAPPING;
782 } else if (strcmp(first_word, "iface") == 0) {
783 static const struct address_family_t *const addr_fams[] = {
784 #if ENABLE_FEATURE_IFUPDOWN_IPV4
787 #if ENABLE_FEATURE_IFUPDOWN_IPV6
793 char *address_family_name;
797 currif = xzalloc(sizeof(*currif));
798 iface_name = next_word(&rest_of_line);
799 address_family_name = next_word(&rest_of_line);
800 method_name = next_word(&rest_of_line);
802 if (method_name == NULL)
803 bb_error_msg_and_die("too few parameters for line \"%s\"", buf);
805 /* ship any trailing whitespace */
806 rest_of_line = skip_whitespace(rest_of_line);
808 if (rest_of_line[0] != '\0' /* && rest_of_line[0] != '#' */)
809 bb_error_msg_and_die("too many parameters \"%s\"", buf);
811 currif->iface = xstrdup(iface_name);
813 currif->address_family = get_address_family(addr_fams, address_family_name);
814 if (!currif->address_family)
815 bb_error_msg_and_die("unknown address type \"%s\"", address_family_name);
817 currif->method = get_method(currif->address_family, method_name);
819 bb_error_msg_and_die("unknown method \"%s\"", method_name);
821 for (iface_list = defn->ifaces; iface_list; iface_list = iface_list->link) {
822 struct interface_defn_t *tmp = (struct interface_defn_t *) iface_list->data;
823 if ((strcmp(tmp->iface, currif->iface) == 0)
824 && (tmp->address_family == currif->address_family)
826 bb_error_msg_and_die("duplicate interface \"%s\"", tmp->iface);
829 llist_add_to_end(&(defn->ifaces), (char*)currif);
831 debug_noise("iface %s %s %s\n", currif->iface, address_family_name, method_name);
832 currently_processing = IFACE;
833 } else if (strcmp(first_word, "auto") == 0) {
834 while ((first_word = next_word(&rest_of_line)) != NULL) {
836 /* Check the interface isnt already listed */
837 if (find_list_string(defn->autointerfaces, first_word)) {
838 bb_perror_msg_and_die("interface declared auto twice \"%s\"", buf);
841 /* Add the interface to the list */
842 llist_add_to_end(&(defn->autointerfaces), xstrdup(first_word));
843 debug_noise("\nauto %s\n", first_word);
845 currently_processing = NONE;
847 switch (currently_processing) {
849 if (rest_of_line[0] == '\0')
850 bb_error_msg_and_die("option with empty value \"%s\"", buf);
852 if (strcmp(first_word, "up") != 0
853 && strcmp(first_word, "down") != 0
854 && strcmp(first_word, "pre-up") != 0
855 && strcmp(first_word, "post-down") != 0
858 for (i = 0; i < currif->n_options; i++) {
859 if (strcmp(currif->option[i].name, first_word) == 0)
860 bb_error_msg_and_die("duplicate option \"%s\"", buf);
863 if (currif->n_options >= currif->max_options) {
864 currif->max_options += 10;
865 currif->option = xrealloc(currif->option,
866 sizeof(*currif->option) * currif->max_options);
868 debug_noise("\t%s=%s\n", first_word, rest_of_line);
869 currif->option[currif->n_options].name = xstrdup(first_word);
870 currif->option[currif->n_options].value = xstrdup(rest_of_line);
874 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
875 if (strcmp(first_word, "script") == 0) {
876 if (currmap->script != NULL)
877 bb_error_msg_and_die("duplicate script in mapping \"%s\"", buf);
878 currmap->script = xstrdup(next_word(&rest_of_line));
879 } else if (strcmp(first_word, "map") == 0) {
880 if (currmap->n_mappings >= currmap->max_mappings) {
881 currmap->max_mappings = currmap->max_mappings * 2 + 1;
882 currmap->mapping = xrealloc(currmap->mapping,
883 sizeof(char *) * currmap->max_mappings);
885 currmap->mapping[currmap->n_mappings] = xstrdup(next_word(&rest_of_line));
886 currmap->n_mappings++;
888 bb_error_msg_and_die("misplaced option \"%s\"", buf);
894 bb_error_msg_and_die("misplaced option \"%s\"", buf);
898 } /* while (fgets) */
900 if (ferror(f) != 0) {
901 /* ferror does NOT set errno! */
902 bb_error_msg_and_die("%s: I/O error", filename);
909 static char *setlocalenv(const char *format, const char *name, const char *value)
915 result = xasprintf(format, name, value);
917 for (here = there = result; *there != '=' && *there; there++) {
921 *there = toupper(*there);
923 if (isalnum(*there) || *there == '_') {
928 memmove(here, there, strlen(there) + 1);
933 static void set_environ(struct interface_defn_t *iface, const char *mode)
937 const int n_env_entries = iface->n_options + 5;
940 if (my_environ != NULL) {
941 for (ppch = my_environ; *ppch; ppch++) {
947 my_environ = xzalloc(sizeof(char *) * (n_env_entries + 1 /* for final NULL */ ));
948 environend = my_environ;
950 for (i = 0; i < iface->n_options; i++) {
951 if (strcmp(iface->option[i].name, "up") == 0
952 || strcmp(iface->option[i].name, "down") == 0
953 || strcmp(iface->option[i].name, "pre-up") == 0
954 || strcmp(iface->option[i].name, "post-down") == 0
958 *(environend++) = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value);
961 *(environend++) = setlocalenv("%s=%s", "IFACE", iface->iface);
962 *(environend++) = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name);
963 *(environend++) = setlocalenv("%s=%s", "METHOD", iface->method->name);
964 *(environend++) = setlocalenv("%s=%s", "MODE", mode);
965 *(environend++) = setlocalenv("%s=%s", "PATH", startup_PATH);
968 static int doit(char *str)
970 if (option_mask32 & (OPT_no_act|OPT_verbose)) {
973 if (!(option_mask32 & OPT_no_act)) {
980 case -1: /* failure */
983 execle(DEFAULT_SHELL, DEFAULT_SHELL, "-c", str, NULL, my_environ);
986 safe_waitpid(child, &status, 0);
987 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
994 static int execute_all(struct interface_defn_t *ifd, const char *opt)
998 for (i = 0; i < ifd->n_options; i++) {
999 if (strcmp(ifd->option[i].name, opt) == 0) {
1000 if (!doit(ifd->option[i].value)) {
1006 buf = xasprintf("run-parts /etc/network/if-%s.d", opt);
1007 /* heh, we don't bother free'ing it */
1011 static int check(char *str)
1016 static int iface_up(struct interface_defn_t *iface)
1018 if (!iface->method->up(iface, check)) return -1;
1019 set_environ(iface, "start");
1020 if (!execute_all(iface, "pre-up")) return 0;
1021 if (!iface->method->up(iface, doit)) return 0;
1022 if (!execute_all(iface, "up")) return 0;
1026 static int iface_down(struct interface_defn_t *iface)
1028 if (!iface->method->down(iface,check)) return -1;
1029 set_environ(iface, "stop");
1030 if (!execute_all(iface, "down")) return 0;
1031 if (!iface->method->down(iface, doit)) return 0;
1032 if (!execute_all(iface, "post-down")) return 0;
1036 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
1037 static int popen2(FILE **in, FILE **out, char *command, char *param)
1039 char *argv[3] = { command, param, NULL };
1040 struct fd_pair infd, outfd;
1050 case -1: /* failure */
1051 bb_perror_msg_and_die("vfork");
1053 /* NB: close _first_, then move fds! */
1056 xmove_fd(infd.rd, 0);
1057 xmove_fd(outfd.wr, 1);
1058 BB_EXECVP(command, argv);
1064 *in = fdopen(infd.wr, "w");
1065 *out = fdopen(outfd.rd, "r");
1069 static char *run_mapping(char *physical, struct mapping_defn_t *map)
1075 char *logical = xstrdup(physical);
1077 /* Run the mapping script. Never fails. */
1078 pid = popen2(&in, &out, map->script, physical);
1080 /* Write mappings to stdin of mapping script. */
1081 for (i = 0; i < map->n_mappings; i++) {
1082 fprintf(in, "%s\n", map->mapping[i]);
1085 safe_waitpid(pid, &status, 0);
1087 if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
1088 /* If the mapping script exited successfully, try to
1089 * grab a line of output and use that as the name of the
1090 * logical interface. */
1091 char *new_logical = xmalloc_fgetline(out);
1094 /* If we are able to read a line of output from the script,
1095 * remove any trailing whitespace and use this value
1096 * as the name of the logical interface. */
1097 char *pch = new_logical + strlen(new_logical) - 1;
1099 while (pch >= new_logical && isspace(*pch))
1103 logical = new_logical;
1111 #endif /* FEATURE_IFUPDOWN_MAPPING */
1113 static llist_t *find_iface_state(llist_t *state_list, const char *iface)
1115 unsigned iface_len = strlen(iface);
1116 llist_t *search = state_list;
1119 if ((strncmp(search->data, iface, iface_len) == 0)
1120 && (search->data[iface_len] == '=')
1124 search = search->link;
1129 /* read the previous state from the state file */
1130 static llist_t *read_iface_state(void)
1132 llist_t *state_list = NULL;
1133 FILE *state_fp = fopen_for_read(CONFIG_IFUPDOWN_IFSTATE_PATH);
1136 char *start, *end_ptr;
1137 while ((start = xmalloc_fgets(state_fp)) != NULL) {
1138 /* We should only need to check for a single character */
1139 end_ptr = start + strcspn(start, " \t\n");
1141 llist_add_to(&state_list, start);
1149 int ifupdown_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1150 int ifupdown_main(int argc, char **argv)
1152 int (*cmds)(struct interface_defn_t *);
1153 struct interfaces_file_t *defn;
1154 llist_t *target_list = NULL;
1155 const char *interfaces = "/etc/network/interfaces";
1156 bool any_failures = 0;
1159 if (applet_name[2] == 'u') {
1164 getopt32(argv, OPTION_STR, &interfaces);
1165 if (argc - optind > 0) {
1166 if (DO_ALL) bb_show_usage();
1168 if (!DO_ALL) bb_show_usage();
1171 debug_noise("reading %s file:\n", interfaces);
1172 defn = read_interfaces(interfaces);
1173 debug_noise("\ndone reading %s\n\n", interfaces);
1175 startup_PATH = getenv("PATH");
1176 if (!startup_PATH) startup_PATH = "";
1178 /* Create a list of interfaces to work on */
1180 target_list = defn->autointerfaces;
1182 llist_add_to_end(&target_list, argv[optind]);
1185 /* Update the interfaces */
1186 while (target_list) {
1187 llist_t *iface_list;
1188 struct interface_defn_t *currif;
1195 iface = xstrdup(target_list->data);
1196 target_list = target_list->link;
1198 pch = strchr(iface, '=');
1201 liface = xstrdup(pch + 1);
1203 liface = xstrdup(iface);
1207 llist_t *state_list = read_iface_state();
1208 const llist_t *iface_state = find_iface_state(state_list, iface);
1210 if (cmds == iface_up) {
1213 bb_error_msg("interface %s already configured", iface);
1219 bb_error_msg("interface %s not configured", iface);
1223 llist_free(state_list, free);
1226 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
1227 if ((cmds == iface_up) && !NO_MAPPINGS) {
1228 struct mapping_defn_t *currmap;
1230 for (currmap = defn->mappings; currmap; currmap = currmap->next) {
1232 for (i = 0; i < currmap->n_matches; i++) {
1233 if (fnmatch(currmap->match[i], liface, 0) != 0)
1236 printf("Running mapping script %s on %s\n", currmap->script, liface);
1238 liface = run_mapping(iface, currmap);
1245 iface_list = defn->ifaces;
1246 while (iface_list) {
1247 currif = (struct interface_defn_t *) iface_list->data;
1248 if (strcmp(liface, currif->iface) == 0) {
1249 char *oldiface = currif->iface;
1252 currif->iface = iface;
1254 debug_noise("\nConfiguring interface %s (%s)\n", liface, currif->address_family->name);
1256 /* Call the cmds function pointer, does either iface_up() or iface_down() */
1257 cmds_ret = cmds(currif);
1258 if (cmds_ret == -1) {
1259 bb_error_msg("don't seem to have all the variables for %s/%s",
1260 liface, currif->address_family->name);
1262 } else if (cmds_ret == 0) {
1266 currif->iface = oldiface;
1268 iface_list = iface_list->link;
1274 if (!okay && !FORCE) {
1275 bb_error_msg("ignoring unknown interface %s", liface);
1277 } else if (!NO_ACT) {
1278 /* update the state file */
1281 llist_t *state_list = read_iface_state();
1282 llist_t *iface_state = find_iface_state(state_list, iface);
1284 if (cmds == iface_up) {
1285 char * const newiface = xasprintf("%s=%s", iface, liface);
1286 if (iface_state == NULL) {
1287 llist_add_to_end(&state_list, newiface);
1289 free(iface_state->data);
1290 iface_state->data = newiface;
1293 /* Remove an interface from state_list */
1294 llist_unlink(&state_list, iface_state);
1295 free(llist_pop(&iface_state));
1298 /* Actually write the new state */
1299 state_fp = xfopen_for_write(CONFIG_IFUPDOWN_IFSTATE_PATH);
1303 fprintf(state_fp, "%s\n", state->data);
1305 state = state->link;
1308 llist_free(state_list, free);
1312 return any_failures;