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 GPLv2 or later, see file LICENSE in this source tree.
20 //usage:#define ifup_trivial_usage
21 //usage: "[-an"IF_FEATURE_IFUPDOWN_MAPPING("m")"vf] [-i FILE] IFACE..."
22 //usage:#define ifup_full_usage "\n\n"
23 //usage: " -a De/configure all interfaces automatically"
24 //usage: "\n -i FILE Use FILE for interface definitions"
25 //usage: "\n -n Print out what would happen, but don't do it"
26 //usage: IF_FEATURE_IFUPDOWN_MAPPING(
27 //usage: "\n (note: doesn't disable mappings)"
28 //usage: "\n -m Don't run any mappings"
30 //usage: "\n -v Print out what would happen before doing it"
31 //usage: "\n -f Force de/configuration"
33 //usage:#define ifdown_trivial_usage
34 //usage: "[-an"IF_FEATURE_IFUPDOWN_MAPPING("m")"vf] [-i FILE] IFACE..."
35 //usage:#define ifdown_full_usage "\n\n"
36 //usage: " -a De/configure all interfaces automatically"
37 //usage: "\n -i FILE Use FILE for interface definitions"
38 //usage: "\n -n Print out what would happen, but don't do it"
39 //usage: IF_FEATURE_IFUPDOWN_MAPPING(
40 //usage: "\n (note: doesn't disable mappings)"
41 //usage: "\n -m Don't run any mappings"
43 //usage: "\n -v Print out what would happen before doing it"
44 //usage: "\n -f Force de/configuration"
47 /* After libbb.h, since it needs sys/types.h on some systems */
48 #include <sys/utsname.h>
51 #define MAX_OPT_DEPTH 10
53 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
54 #define MAX_INTERFACE_LENGTH 10
57 #define UDHCPC_CMD_OPTIONS CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS
59 #define debug_noise(args...) /*fprintf(stderr, args)*/
61 /* Forward declaration */
62 struct interface_defn_t;
64 typedef int execfn(char *command);
68 int (*up)(struct interface_defn_t *ifd, execfn *e) FAST_FUNC;
69 int (*down)(struct interface_defn_t *ifd, execfn *e) FAST_FUNC;
72 struct address_family_t {
75 const struct method_t *method;
78 struct mapping_defn_t {
79 struct mapping_defn_t *next;
96 struct interface_defn_t {
97 const struct address_family_t *address_family;
98 const struct method_t *method;
102 struct variable_t *option;
105 struct interfaces_file_t {
106 llist_t *autointerfaces;
108 struct mapping_defn_t *mappings;
112 #define OPTION_STR "anvf" IF_FEATURE_IFUPDOWN_MAPPING("m") "i:"
118 OPT_no_mappings = 0x10,
120 #define DO_ALL (option_mask32 & OPT_do_all)
121 #define NO_ACT (option_mask32 & OPT_no_act)
122 #define VERBOSE (option_mask32 & OPT_verbose)
123 #define FORCE (option_mask32 & OPT_force)
124 #define NO_MAPPINGS (option_mask32 & OPT_no_mappings)
129 const char *startup_PATH;
132 #define G (*(struct globals*)&bb_common_bufsiz1)
133 #define INIT_G() do { } while (0)
136 static const char keywords_up_down[] ALIGN1 =
144 #if ENABLE_FEATURE_IFUPDOWN_IPV4 || ENABLE_FEATURE_IFUPDOWN_IPV6
146 static void addstr(char **bufp, const char *str, size_t str_length)
148 /* xasprintf trick will be smaller, but we are often
149 * called with str_length == 1 - don't want to have
150 * THAT much of malloc/freeing! */
152 int len = (buf ? strlen(buf) : 0);
154 buf = xrealloc(buf, len + str_length);
155 /* copies at most str_length-1 chars! */
156 safe_strncpy(buf + len, str, str_length);
160 static int strncmpz(const char *l, const char *r, size_t llen)
162 int i = strncmp(l, r, llen);
165 return - (unsigned char)r[llen];
169 static char *get_var(const char *id, size_t idlen, struct interface_defn_t *ifd)
173 if (strncmpz(id, "iface", idlen) == 0) {
174 // ubuntu's ifup doesn't do this:
175 //static char *label_buf;
178 //label_buf = xstrdup(ifd->iface);
179 // Remove virtual iface suffix
180 //result = strchrnul(label_buf, ':');
186 if (strncmpz(id, "label", idlen) == 0) {
189 for (i = 0; i < ifd->n_options; i++) {
190 if (strncmpz(id, ifd->option[i].name, idlen) == 0) {
191 return ifd->option[i].value;
197 # if ENABLE_FEATURE_IFUPDOWN_IP
198 static int count_netmask_bits(const char *dotted_quad)
201 // unsigned a, b, c, d;
202 // /* Found a netmask... Check if it is dotted quad */
203 // if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) != 4)
205 // if ((a|b|c|d) >> 8)
206 // return -1; /* one of numbers is >= 256 */
207 // d |= (a << 24) | (b << 16) | (c << 8); /* IP */
208 // d = ~d; /* 11110000 -> 00001111 */
210 /* Shorter version */
215 if (inet_aton(dotted_quad, &ip) == 0)
216 return -1; /* malformed dotted IP */
217 d = ntohl(ip.s_addr); /* IP in host order */
218 d = ~d; /* 11110000 -> 00001111 */
219 if (d & (d+1)) /* check that it is in 00001111 form */
220 return -1; /* no it is not */
230 static char *parse(const char *command, struct interface_defn_t *ifd)
232 size_t old_pos[MAX_OPT_DEPTH] = { 0 };
233 smallint okay[MAX_OPT_DEPTH] = { 1 };
240 addstr(&result, command, 1);
246 addstr(&result, command, 1);
250 if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) {
251 old_pos[opt_depth] = result ? strlen(result) : 0;
256 addstr(&result, command, 1);
261 if (command[1] == ']' && opt_depth > 1) {
263 if (!okay[opt_depth]) {
264 result[old_pos[opt_depth]] = '\0';
268 addstr(&result, command, 1);
278 nextpercent = strchr(command, '%');
280 /* Unterminated %var% */
285 varvalue = get_var(command, nextpercent - command, ifd);
288 # if ENABLE_FEATURE_IFUPDOWN_IP
289 /* "hwaddress <class> <address>":
290 * unlike ifconfig, ip doesnt want <class>
291 * (usually "ether" keyword). Skip it. */
292 if (strncmp(command, "hwaddress", 9) == 0) {
293 varvalue = skip_whitespace(skip_non_whitespace(varvalue));
296 addstr(&result, varvalue, strlen(varvalue));
298 # if ENABLE_FEATURE_IFUPDOWN_IP
299 /* Sigh... Add a special case for 'ip' to convert from
300 * dotted quad to bit count style netmasks. */
301 if (strncmp(command, "bnmask", 6) == 0) {
303 varvalue = get_var("netmask", 7, ifd);
305 res = count_netmask_bits(varvalue);
307 const char *argument = utoa(res);
308 addstr(&result, argument, strlen(argument));
309 command = nextpercent + 1;
315 okay[opt_depth - 1] = 0;
318 command = nextpercent + 1;
325 /* Unbalanced bracket */
331 /* Undefined variable and we aren't in a bracket */
339 /* execute() returns 1 for success and 0 for failure */
340 static int execute(const char *command, struct interface_defn_t *ifd, execfn *exec)
345 out = parse(command, ifd);
350 /* out == "": parsed ok but not all needed variables known, skip */
351 ret = out[0] ? (*exec)(out) : 1;
360 #endif /* FEATURE_IFUPDOWN_IPV4 || FEATURE_IFUPDOWN_IPV6 */
363 #if ENABLE_FEATURE_IFUPDOWN_IPV6
365 static int FAST_FUNC loopback_up6(struct interface_defn_t *ifd, execfn *exec)
367 # if ENABLE_FEATURE_IFUPDOWN_IP
369 result = execute("ip addr add ::1 dev %iface%", ifd, exec);
370 result += execute("ip link set %iface% up", ifd, exec);
371 return ((result == 2) ? 2 : 0);
373 return execute("ifconfig %iface% add ::1", ifd, exec);
377 static int FAST_FUNC loopback_down6(struct interface_defn_t *ifd, execfn *exec)
379 # if ENABLE_FEATURE_IFUPDOWN_IP
380 return execute("ip link set %iface% down", ifd, exec);
382 return execute("ifconfig %iface% del ::1", ifd, exec);
386 static int FAST_FUNC manual_up_down6(struct interface_defn_t *ifd UNUSED_PARAM, execfn *exec UNUSED_PARAM)
391 static int FAST_FUNC static_up6(struct interface_defn_t *ifd, execfn *exec)
394 # if ENABLE_FEATURE_IFUPDOWN_IP
395 result = execute("ip addr add %address%/%netmask% dev %iface%[[ label %label%]]", ifd, exec);
396 result += execute("ip link set[[ mtu %mtu%]][[ addr %hwaddress%]] %iface% up", ifd, exec);
397 /* Was: "[[ ip ....%gateway% ]]". Removed extra spaces w/o checking */
398 result += execute("[[ip route add ::/0 via %gateway%]][[ prio %metric%]]", ifd, exec);
400 result = execute("ifconfig %iface%[[ media %media%]][[ hw %hwaddress%]][[ mtu %mtu%]] up", ifd, exec);
401 result += execute("ifconfig %iface% add %address%/%netmask%", ifd, exec);
402 result += execute("[[route -A inet6 add ::/0 gw %gateway%[[ metric %metric%]]]]", ifd, exec);
404 return ((result == 3) ? 3 : 0);
407 static int FAST_FUNC static_down6(struct interface_defn_t *ifd, execfn *exec)
409 # if ENABLE_FEATURE_IFUPDOWN_IP
410 return execute("ip link set %iface% down", ifd, exec);
412 return execute("ifconfig %iface% down", ifd, exec);
416 # if ENABLE_FEATURE_IFUPDOWN_IP
417 static int FAST_FUNC v4tunnel_up(struct interface_defn_t *ifd, execfn *exec)
420 result = execute("ip tunnel add %iface% mode sit remote "
421 "%endpoint%[[ local %local%]][[ ttl %ttl%]]", ifd, exec);
422 result += execute("ip link set %iface% up", ifd, exec);
423 result += execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec);
424 result += execute("[[ip route add ::/0 via %gateway%]]", ifd, exec);
425 return ((result == 4) ? 4 : 0);
428 static int FAST_FUNC v4tunnel_down(struct interface_defn_t * ifd, execfn * exec)
430 return execute("ip tunnel del %iface%", ifd, exec);
434 static const struct method_t methods6[] = {
435 # if ENABLE_FEATURE_IFUPDOWN_IP
436 { "v4tunnel" , v4tunnel_up , v4tunnel_down , },
438 { "static" , static_up6 , static_down6 , },
439 { "manual" , manual_up_down6 , manual_up_down6 , },
440 { "loopback" , loopback_up6 , loopback_down6 , },
443 static const struct address_family_t addr_inet6 = {
445 ARRAY_SIZE(methods6),
449 #endif /* FEATURE_IFUPDOWN_IPV6 */
452 #if ENABLE_FEATURE_IFUPDOWN_IPV4
454 static int FAST_FUNC loopback_up(struct interface_defn_t *ifd, execfn *exec)
456 # if ENABLE_FEATURE_IFUPDOWN_IP
458 result = execute("ip addr add 127.0.0.1/8 dev %iface%", ifd, exec);
459 result += execute("ip link set %iface% up", ifd, exec);
460 return ((result == 2) ? 2 : 0);
462 return execute("ifconfig %iface% 127.0.0.1 up", ifd, exec);
466 static int FAST_FUNC loopback_down(struct interface_defn_t *ifd, execfn *exec)
468 # if ENABLE_FEATURE_IFUPDOWN_IP
470 result = execute("ip addr flush dev %iface%", ifd, exec);
471 result += execute("ip link set %iface% down", ifd, exec);
472 return ((result == 2) ? 2 : 0);
474 return execute("ifconfig %iface% 127.0.0.1 down", ifd, exec);
478 static int FAST_FUNC static_up(struct interface_defn_t *ifd, execfn *exec)
481 # if ENABLE_FEATURE_IFUPDOWN_IP
482 result = execute("ip addr add %address%/%bnmask%[[ broadcast %broadcast%]] "
483 "dev %iface%[[ peer %pointopoint%]][[ label %label%]]", ifd, exec);
484 result += execute("ip link set[[ mtu %mtu%]][[ addr %hwaddress%]] %iface% up", ifd, exec);
485 result += execute("[[ip route add default via %gateway% dev %iface%[[ prio %metric%]]]]", ifd, exec);
486 return ((result == 3) ? 3 : 0);
488 /* ifconfig said to set iface up before it processes hw %hwaddress%,
489 * which then of course fails. Thus we run two separate ifconfig */
490 result = execute("ifconfig %iface%[[ hw %hwaddress%]][[ media %media%]][[ mtu %mtu%]] up",
492 result += execute("ifconfig %iface% %address% netmask %netmask%"
493 "[[ broadcast %broadcast%]][[ pointopoint %pointopoint%]] ",
495 result += execute("[[route add default gw %gateway%[[ metric %metric%]] %iface%]]", ifd, exec);
496 return ((result == 3) ? 3 : 0);
500 static int FAST_FUNC static_down(struct interface_defn_t *ifd, execfn *exec)
503 # if ENABLE_FEATURE_IFUPDOWN_IP
504 result = execute("ip addr flush dev %iface%", ifd, exec);
505 result += execute("ip link set %iface% down", ifd, exec);
507 /* result = execute("[[route del default gw %gateway% %iface%]]", ifd, exec); */
508 /* Bringing the interface down deletes the routes in itself.
509 Otherwise this fails if we reference 'gateway' when using this from dhcp_down */
511 result += execute("ifconfig %iface% down", ifd, exec);
513 return ((result == 2) ? 2 : 0);
516 # if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
517 struct dhcp_client_t {
519 const char *startcmd;
523 static const struct dhcp_client_t ext_dhcp_clients[] = {
525 "dhcpcd[[ -h %hostname%]][[ -i %vendor%]][[ -I %client%]][[ -l %leasetime%]] %iface%",
529 "dhclient -pf /var/run/dhclient.%iface%.pid %iface%",
530 "kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null",
533 "pump -i %iface%[[ -h %hostname%]][[ -l %leasehours%]]",
534 "pump -i %iface% -k",
537 "udhcpc " UDHCPC_CMD_OPTIONS " -p /var/run/udhcpc.%iface%.pid -i %iface%[[ -H %hostname%]][[ -c %client%]]"
538 "[[ -s %script%]][[ %udhcpc_opts%]]",
539 "kill `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
542 # endif /* FEATURE_IFUPDOWN_EXTERNAL_DHCPC */
544 # if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
545 static int FAST_FUNC dhcp_up(struct interface_defn_t *ifd, execfn *exec)
548 # if ENABLE_FEATURE_IFUPDOWN_IP
549 /* ip doesn't up iface when it configures it (unlike ifconfig) */
550 if (!execute("ip link set[[ addr %hwaddress%]] %iface% up", ifd, exec))
553 /* needed if we have hwaddress on dhcp iface */
554 if (!execute("ifconfig %iface%[[ hw %hwaddress%]] up", ifd, exec))
557 for (i = 0; i < ARRAY_SIZE(ext_dhcp_clients); i++) {
558 if (exists_execable(ext_dhcp_clients[i].name))
559 return execute(ext_dhcp_clients[i].startcmd, ifd, exec);
561 bb_error_msg("no dhcp clients found");
565 static int FAST_FUNC dhcp_up(struct interface_defn_t *ifd, execfn *exec)
567 # if ENABLE_FEATURE_IFUPDOWN_IP
568 /* ip doesn't up iface when it configures it (unlike ifconfig) */
569 if (!execute("ip link set[[ addr %hwaddress%]] %iface% up", ifd, exec))
572 /* needed if we have hwaddress on dhcp iface */
573 if (!execute("ifconfig %iface%[[ hw %hwaddress%]] up", ifd, exec))
576 return execute("udhcpc " UDHCPC_CMD_OPTIONS " -p /var/run/udhcpc.%iface%.pid "
577 "-i %iface%[[ -H %hostname%]][[ -c %client%]][[ -s %script%]][[ %udhcpc_opts%]]",
581 static int FAST_FUNC dhcp_up(struct interface_defn_t *ifd UNUSED_PARAM,
582 execfn *exec UNUSED_PARAM)
584 return 0; /* no dhcp support */
588 # if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
589 static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd, execfn *exec)
594 for (i = 0; i < ARRAY_SIZE(ext_dhcp_clients); i++) {
595 if (exists_execable(ext_dhcp_clients[i].name)) {
596 result = execute(ext_dhcp_clients[i].stopcmd, ifd, exec);
603 bb_error_msg("warning: no dhcp clients found and stopped");
605 /* Sleep a bit, otherwise static_down tries to bring down interface too soon,
606 and it may come back up because udhcpc is still shutting down */
608 result += static_down(ifd, exec);
609 return ((result == 3) ? 3 : 0);
612 static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd, execfn *exec)
616 "test -f /var/run/udhcpc.%iface%.pid && "
617 "kill `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
619 /* Also bring the hardware interface down since
620 killing the dhcp client alone doesn't do it.
621 This enables consecutive ifup->ifdown->ifup */
622 /* Sleep a bit, otherwise static_down tries to bring down interface too soon,
623 and it may come back up because udhcpc is still shutting down */
625 result += static_down(ifd, exec);
626 return ((result == 3) ? 3 : 0);
629 static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd UNUSED_PARAM,
630 execfn *exec UNUSED_PARAM)
632 return 0; /* no dhcp support */
636 static int FAST_FUNC manual_up_down(struct interface_defn_t *ifd UNUSED_PARAM, execfn *exec UNUSED_PARAM)
641 static int FAST_FUNC bootp_up(struct interface_defn_t *ifd, execfn *exec)
643 return execute("bootpc[[ --bootfile %bootfile%]] --dev %iface%"
644 "[[ --server %server%]][[ --hwaddr %hwaddr%]]"
645 " --returniffail --serverbcast", ifd, exec);
648 static int FAST_FUNC ppp_up(struct interface_defn_t *ifd, execfn *exec)
650 return execute("pon[[ %provider%]]", ifd, exec);
653 static int FAST_FUNC ppp_down(struct interface_defn_t *ifd, execfn *exec)
655 return execute("poff[[ %provider%]]", ifd, exec);
658 static int FAST_FUNC wvdial_up(struct interface_defn_t *ifd, execfn *exec)
660 return execute("start-stop-daemon --start -x wvdial "
661 "-p /var/run/wvdial.%iface% -b -m --[[ %provider%]]", ifd, exec);
664 static int FAST_FUNC wvdial_down(struct interface_defn_t *ifd, execfn *exec)
666 return execute("start-stop-daemon --stop -x wvdial "
667 "-p /var/run/wvdial.%iface% -s 2", ifd, exec);
670 static const struct method_t methods[] = {
671 { "manual" , manual_up_down, manual_up_down, },
672 { "wvdial" , wvdial_up , wvdial_down , },
673 { "ppp" , ppp_up , ppp_down , },
674 { "static" , static_up , static_down , },
675 { "bootp" , bootp_up , static_down , },
676 { "dhcp" , dhcp_up , dhcp_down , },
677 { "loopback", loopback_up , loopback_down , },
680 static const struct address_family_t addr_inet = {
686 #endif /* FEATURE_IFUPDOWN_IPV4 */
689 /* Returns pointer to the next word, or NULL.
690 * In 1st case, advances *buf to the word after this one.
692 static char *next_word(char **buf)
697 /* Skip over leading whitespace */
698 word = skip_whitespace(*buf);
704 /* Find the length of this word (can't be 0) */
705 length = strcspn(word, " \t\n");
707 /* Unless we are already at NUL, store NUL and advance */
708 if (word[length] != '\0')
709 word[length++] = '\0';
711 *buf = skip_whitespace(word + length);
716 static const struct address_family_t *get_address_family(const struct address_family_t *const af[], char *name)
723 for (i = 0; af[i]; i++) {
724 if (strcmp(af[i]->name, name) == 0) {
731 static const struct method_t *get_method(const struct address_family_t *af, char *name)
737 /* TODO: use index_in_str_array() */
738 for (i = 0; i < af->n_methods; i++) {
739 if (strcmp(af->method[i].name, name) == 0) {
740 return &af->method[i];
746 static struct interfaces_file_t *read_interfaces(const char *filename, struct interfaces_file_t *defn)
748 /* Let's try to be compatible.
750 * "man 5 interfaces" says:
751 * Lines starting with "#" are ignored. Note that end-of-line
752 * comments are NOT supported, comments must be on a line of their own.
753 * A line may be extended across multiple lines by making
754 * the last character a backslash.
756 * Seen elsewhere in example config file:
757 * A first non-blank "#" character makes the rest of the line
758 * be ignored. Blank lines are ignored. Lines may be indented freely.
759 * A "\" character at the very end of the line indicates the next line
760 * should be treated as a continuation of the current one.
762 * Lines beginning with "source" are used to include stanzas from
763 * other files, so configuration can be split into many files.
764 * The word "source" is followed by the path of file to be sourced.
766 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
767 struct mapping_defn_t *currmap = NULL;
769 struct interface_defn_t *currif = NULL;
774 enum { NONE, IFACE, MAPPING } currently_processing = NONE;
777 defn = xzalloc(sizeof(*defn));
779 debug_noise("reading %s file:\n", filename);
780 f = xfopen_for_read(filename);
782 while ((buf = xmalloc_fgetline(f)) != NULL) {
784 /* Trailing "\" concatenates lines */
786 while ((p = last_char_is(buf, '\\')) != NULL) {
788 rest_of_line = xmalloc_fgetline(f);
791 p = xasprintf("%s%s", buf, rest_of_line);
798 first_word = next_word(&rest_of_line);
799 if (!first_word || *first_word == '#') {
801 continue; /* blank/comment line */
804 if (strcmp(first_word, "mapping") == 0) {
805 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
806 currmap = xzalloc(sizeof(*currmap));
808 while ((first_word = next_word(&rest_of_line)) != NULL) {
809 currmap->match = xrealloc_vector(currmap->match, 4, currmap->n_matches);
810 currmap->match[currmap->n_matches++] = xstrdup(first_word);
812 /*currmap->n_mappings = 0;*/
813 /*currmap->mapping = NULL;*/
814 /*currmap->script = NULL;*/
816 struct mapping_defn_t **where = &defn->mappings;
817 while (*where != NULL) {
818 where = &(*where)->next;
821 /*currmap->next = NULL;*/
823 debug_noise("Added mapping\n");
825 currently_processing = MAPPING;
826 } else if (strcmp(first_word, "iface") == 0) {
827 static const struct address_family_t *const addr_fams[] = {
828 #if ENABLE_FEATURE_IFUPDOWN_IPV4
831 #if ENABLE_FEATURE_IFUPDOWN_IPV6
837 char *address_family_name;
841 currif = xzalloc(sizeof(*currif));
842 iface_name = next_word(&rest_of_line);
843 address_family_name = next_word(&rest_of_line);
844 method_name = next_word(&rest_of_line);
846 if (method_name == NULL)
847 bb_error_msg_and_die("too few parameters for line \"%s\"", buf);
849 /* ship any trailing whitespace */
850 rest_of_line = skip_whitespace(rest_of_line);
852 if (rest_of_line[0] != '\0' /* && rest_of_line[0] != '#' */)
853 bb_error_msg_and_die("too many parameters \"%s\"", buf);
855 currif->iface = xstrdup(iface_name);
857 currif->address_family = get_address_family(addr_fams, address_family_name);
858 if (!currif->address_family)
859 bb_error_msg_and_die("unknown address type \"%s\"", address_family_name);
861 currif->method = get_method(currif->address_family, method_name);
863 bb_error_msg_and_die("unknown method \"%s\"", method_name);
865 for (iface_list = defn->ifaces; iface_list; iface_list = iface_list->link) {
866 struct interface_defn_t *tmp = (struct interface_defn_t *) iface_list->data;
867 if ((strcmp(tmp->iface, currif->iface) == 0)
868 && (tmp->address_family == currif->address_family)
870 bb_error_msg_and_die("duplicate interface \"%s\"", tmp->iface);
873 llist_add_to_end(&(defn->ifaces), (char*)currif);
875 debug_noise("iface %s %s %s\n", currif->iface, address_family_name, method_name);
876 currently_processing = IFACE;
877 } else if (strcmp(first_word, "auto") == 0) {
878 while ((first_word = next_word(&rest_of_line)) != NULL) {
880 /* Check the interface isnt already listed */
881 if (llist_find_str(defn->autointerfaces, first_word)) {
882 bb_perror_msg_and_die("interface declared auto twice \"%s\"", buf);
885 /* Add the interface to the list */
886 llist_add_to_end(&(defn->autointerfaces), xstrdup(first_word));
887 debug_noise("\nauto %s\n", first_word);
889 currently_processing = NONE;
890 } else if (strcmp(first_word, "source") == 0) {
891 read_interfaces(next_word(&rest_of_line), defn);
893 switch (currently_processing) {
895 if (rest_of_line[0] == '\0')
896 bb_error_msg_and_die("option with empty value \"%s\"", buf);
898 if (strcmp(first_word, "post-up") == 0)
899 first_word += 5; /* "up" */
900 else if (strcmp(first_word, "pre-down") == 0)
901 first_word += 4; /* "down" */
903 /* If not one of "up", "down",... words... */
904 if (index_in_strings(keywords_up_down, first_word) < 0) {
906 for (i = 0; i < currif->n_options; i++) {
907 if (strcmp(currif->option[i].name, first_word) == 0)
908 bb_error_msg_and_die("duplicate option \"%s\"", buf);
911 debug_noise("\t%s=%s\n", first_word, rest_of_line);
912 currif->option = xrealloc_vector(currif->option, 4, currif->n_options);
913 currif->option[currif->n_options].name = xstrdup(first_word);
914 currif->option[currif->n_options].value = xstrdup(rest_of_line);
918 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
919 if (strcmp(first_word, "script") == 0) {
920 if (currmap->script != NULL)
921 bb_error_msg_and_die("duplicate script in mapping \"%s\"", buf);
922 currmap->script = xstrdup(next_word(&rest_of_line));
923 } else if (strcmp(first_word, "map") == 0) {
924 currmap->mapping = xrealloc_vector(currmap->mapping, 2, currmap->n_mappings);
925 currmap->mapping[currmap->n_mappings] = xstrdup(next_word(&rest_of_line));
926 currmap->n_mappings++;
928 bb_error_msg_and_die("misplaced option \"%s\"", buf);
934 bb_error_msg_and_die("misplaced option \"%s\"", buf);
938 } /* while (fgets) */
940 if (ferror(f) != 0) {
941 /* ferror does NOT set errno! */
942 bb_error_msg_and_die("%s: I/O error", filename);
945 debug_noise("\ndone reading %s\n\n", filename);
950 static char *setlocalenv(const char *format, const char *name, const char *value)
957 result = xasprintf(format, name, value);
959 for (dst = src = result; (c = *src) != '=' && c; src++) {
962 if (c >= 'a' && c <= 'z')
964 if (isalnum(c) || c == '_')
967 overlapping_strcpy(dst, src);
972 static void set_environ(struct interface_defn_t *iface, const char *mode, const char *opt)
977 if (G.my_environ != NULL) {
978 for (pp = G.my_environ; *pp; pp++) {
984 /* note: last element will stay NULL: */
985 G.my_environ = xzalloc(sizeof(char *) * (iface->n_options + 7));
988 for (i = 0; i < iface->n_options; i++) {
989 if (index_in_strings(keywords_up_down, iface->option[i].name) >= 0) {
992 *pp++ = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value);
995 *pp++ = setlocalenv("%s=%s", "IFACE", iface->iface);
996 *pp++ = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name);
997 *pp++ = setlocalenv("%s=%s", "METHOD", iface->method->name);
998 *pp++ = setlocalenv("%s=%s", "MODE", mode);
999 *pp++ = setlocalenv("%s=%s", "PHASE", opt);
1001 *pp++ = setlocalenv("%s=%s", "PATH", G.startup_PATH);
1004 static int doit(char *str)
1006 if (option_mask32 & (OPT_no_act|OPT_verbose)) {
1009 if (!(option_mask32 & OPT_no_act)) {
1015 if (child < 0) /* failure */
1017 if (child == 0) { /* child */
1018 execle(G.shell, G.shell, "-c", str, (char *) NULL, G.my_environ);
1021 safe_waitpid(child, &status, 0);
1022 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
1029 static int execute_all(struct interface_defn_t *ifd, const char *opt)
1033 for (i = 0; i < ifd->n_options; i++) {
1034 if (strcmp(ifd->option[i].name, opt) == 0) {
1035 if (!doit(ifd->option[i].value)) {
1041 buf = xasprintf("run-parts /etc/network/if-%s.d", opt);
1042 /* heh, we don't bother free'ing it */
1046 static int check(char *str)
1051 static int iface_up(struct interface_defn_t *iface)
1053 if (!iface->method->up(iface, check)) return -1;
1054 set_environ(iface, "start", "pre-up");
1055 if (!execute_all(iface, "pre-up")) return 0;
1056 if (!iface->method->up(iface, doit)) return 0;
1057 set_environ(iface, "start", "post-up");
1058 if (!execute_all(iface, "up")) return 0;
1062 static int iface_down(struct interface_defn_t *iface)
1064 if (!iface->method->down(iface, check)) return -1;
1065 set_environ(iface, "stop", "pre-down");
1066 if (!execute_all(iface, "down")) return 0;
1067 if (!iface->method->down(iface, doit)) return 0;
1068 set_environ(iface, "stop", "post-down");
1069 if (!execute_all(iface, "post-down")) return 0;
1073 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
1074 static int popen2(FILE **in, FILE **out, char *command, char *param)
1076 char *argv[3] = { command, param, NULL };
1077 struct fd_pair infd, outfd;
1088 /* NB: close _first_, then move fds! */
1091 xmove_fd(infd.rd, 0);
1092 xmove_fd(outfd.wr, 1);
1093 BB_EXECVP_or_die(argv);
1098 *in = xfdopen_for_write(infd.wr);
1099 *out = xfdopen_for_read(outfd.rd);
1103 static char *run_mapping(char *physical, struct mapping_defn_t *map)
1109 char *logical = xstrdup(physical);
1111 /* Run the mapping script. Never fails. */
1112 pid = popen2(&in, &out, map->script, physical);
1114 /* Write mappings to stdin of mapping script. */
1115 for (i = 0; i < map->n_mappings; i++) {
1116 fprintf(in, "%s\n", map->mapping[i]);
1119 safe_waitpid(pid, &status, 0);
1121 if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
1122 /* If the mapping script exited successfully, try to
1123 * grab a line of output and use that as the name of the
1124 * logical interface. */
1125 char *new_logical = xmalloc_fgetline(out);
1128 /* If we are able to read a line of output from the script,
1129 * remove any trailing whitespace and use this value
1130 * as the name of the logical interface. */
1131 char *pch = new_logical + strlen(new_logical) - 1;
1133 while (pch >= new_logical && isspace(*pch))
1137 logical = new_logical;
1145 #endif /* FEATURE_IFUPDOWN_MAPPING */
1147 static llist_t *find_iface_state(llist_t *state_list, const char *iface)
1149 unsigned iface_len = strlen(iface);
1150 llist_t *search = state_list;
1153 if ((strncmp(search->data, iface, iface_len) == 0)
1154 && (search->data[iface_len] == '=')
1158 search = search->link;
1163 /* read the previous state from the state file */
1164 static llist_t *read_iface_state(void)
1166 llist_t *state_list = NULL;
1167 FILE *state_fp = fopen_for_read(CONFIG_IFUPDOWN_IFSTATE_PATH);
1170 char *start, *end_ptr;
1171 while ((start = xmalloc_fgets(state_fp)) != NULL) {
1172 /* We should only need to check for a single character */
1173 end_ptr = start + strcspn(start, " \t\n");
1175 llist_add_to(&state_list, start);
1183 int ifupdown_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1184 int ifupdown_main(int argc UNUSED_PARAM, char **argv)
1186 int (*cmds)(struct interface_defn_t *);
1187 struct interfaces_file_t *defn;
1188 llist_t *target_list = NULL;
1189 const char *interfaces = "/etc/network/interfaces";
1190 bool any_failures = 0;
1194 G.startup_PATH = getenv("PATH");
1195 G.shell = xstrdup(get_shell_name());
1198 if (applet_name[2] == 'u') {
1203 getopt32(argv, OPTION_STR, &interfaces);
1206 if (DO_ALL) bb_show_usage();
1208 if (!DO_ALL) bb_show_usage();
1211 defn = read_interfaces(interfaces, NULL);
1213 /* Create a list of interfaces to work on */
1215 target_list = defn->autointerfaces;
1217 llist_add_to_end(&target_list, argv[0]);
1220 /* Update the interfaces */
1221 while (target_list) {
1222 llist_t *iface_list;
1223 struct interface_defn_t *currif;
1230 iface = xstrdup(target_list->data);
1231 target_list = target_list->link;
1233 pch = strchr(iface, '=');
1236 liface = xstrdup(pch + 1);
1238 liface = xstrdup(iface);
1242 llist_t *state_list = read_iface_state();
1243 const llist_t *iface_state = find_iface_state(state_list, iface);
1245 if (cmds == iface_up) {
1248 bb_error_msg("interface %s already configured", iface);
1254 bb_error_msg("interface %s not configured", iface);
1258 llist_free(state_list, free);
1261 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
1262 if ((cmds == iface_up) && !NO_MAPPINGS) {
1263 struct mapping_defn_t *currmap;
1265 for (currmap = defn->mappings; currmap; currmap = currmap->next) {
1267 for (i = 0; i < currmap->n_matches; i++) {
1268 if (fnmatch(currmap->match[i], liface, 0) != 0)
1271 printf("Running mapping script %s on %s\n", currmap->script, liface);
1273 liface = run_mapping(iface, currmap);
1280 iface_list = defn->ifaces;
1281 while (iface_list) {
1282 currif = (struct interface_defn_t *) iface_list->data;
1283 if (strcmp(liface, currif->iface) == 0) {
1284 char *oldiface = currif->iface;
1287 currif->iface = iface;
1289 debug_noise("\nConfiguring interface %s (%s)\n", liface, currif->address_family->name);
1291 /* Call the cmds function pointer, does either iface_up() or iface_down() */
1292 cmds_ret = cmds(currif);
1293 if (cmds_ret == -1) {
1294 bb_error_msg("don't seem to have all the variables for %s/%s",
1295 liface, currif->address_family->name);
1297 } else if (cmds_ret == 0) {
1301 currif->iface = oldiface;
1303 iface_list = iface_list->link;
1309 if (!okay && !FORCE) {
1310 bb_error_msg("ignoring unknown interface %s", liface);
1312 } else if (!NO_ACT) {
1313 /* update the state file */
1316 llist_t *state_list = read_iface_state();
1317 llist_t *iface_state = find_iface_state(state_list, iface);
1319 if (cmds == iface_up && !any_failures) {
1320 char *newiface = xasprintf("%s=%s", iface, liface);
1322 llist_add_to_end(&state_list, newiface);
1324 free(iface_state->data);
1325 iface_state->data = newiface;
1328 /* Remove an interface from state_list */
1329 llist_unlink(&state_list, iface_state);
1330 free(llist_pop(&iface_state));
1333 /* Actually write the new state */
1334 state_fp = xfopen_for_write(CONFIG_IFUPDOWN_IFSTATE_PATH);
1338 fprintf(state_fp, "%s\n", state->data);
1340 state = state->link;
1343 llist_free(state_list, free);
1350 return any_failures;