1 /* vi: set sw=4 ts=4: */
3 * ifup/ifdown for busybox
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 //config: bool "ifup (17 kb)"
23 //config: Activate the specified interfaces. This applet makes use
24 //config: of either "ifconfig" and "route" or the "ip" command to actually
25 //config: configure network interfaces. Therefore, you will probably also want
26 //config: to enable either IFCONFIG and ROUTE, or enable
27 //config: FEATURE_IFUPDOWN_IP and the various IP options. Of
28 //config: course you could use non-busybox versions of these programs, so
29 //config: against my better judgement (since this will surely result in plenty
30 //config: of support questions on the mailing list), I do not force you to
31 //config: enable these additional options. It is up to you to supply either
32 //config: "ifconfig", "route" and "run-parts" or the "ip" command, either
33 //config: via busybox or via standalone utilities.
35 //config:config IFDOWN
36 //config: bool "ifdown (15 kb)"
39 //config: Deactivate the specified interfaces.
41 //config:config IFUPDOWN_IFSTATE_PATH
42 //config: string "Absolute path to ifstate file"
43 //config: default "/var/run/ifstate"
44 //config: depends on IFUP || IFDOWN
46 //config: ifupdown keeps state information in a file called ifstate.
47 //config: Typically it is located in /var/run/ifstate, however
48 //config: some distributions tend to put it in other places
49 //config: (debian, for example, uses /etc/network/run/ifstate).
50 //config: This config option defines location of ifstate.
52 //config:config FEATURE_IFUPDOWN_IP
53 //config: bool "Use ip tool (else ifconfig/route is used)"
55 //config: depends on IFUP || IFDOWN
57 //config: Use the iproute "ip" command to implement "ifup" and "ifdown", rather
58 //config: than the default of using the older "ifconfig" and "route" utilities.
60 //config: If Y: you must install either the full-blown iproute2 package
61 //config: or enable "ip" applet in busybox, or the "ifup" and "ifdown" applets
62 //config: will not work.
64 //config: If N: you must install either the full-blown ifconfig and route
65 //config: utilities, or enable these applets in busybox.
67 //config:config FEATURE_IFUPDOWN_IPV4
68 //config: bool "Support IPv4"
70 //config: depends on IFUP || IFDOWN
72 //config: If you want ifup/ifdown to talk IPv4, leave this on.
74 //config:config FEATURE_IFUPDOWN_IPV6
75 //config: bool "Support IPv6"
77 //config: depends on (IFUP || IFDOWN) && FEATURE_IPV6
79 //config: If you need support for IPv6, turn this option on.
82 ////////:config FEATURE_IFUPDOWN_IPX
83 ////////: bool "Support IPX"
85 ////////: depends on IFUP || IFDOWN
87 ////////: If this option is selected you can use busybox to work with IPX
90 //config:config FEATURE_IFUPDOWN_MAPPING
91 //config: bool "Enable mapping support"
93 //config: depends on IFUP || IFDOWN
95 //config: This enables support for the "mapping" stanza, unless you have
96 //config: a weird network setup you don't need it.
98 //config:config FEATURE_IFUPDOWN_EXTERNAL_DHCP
99 //config: bool "Support external DHCP clients"
101 //config: depends on IFUP || IFDOWN
103 //config: This enables support for the external dhcp clients. Clients are
104 //config: tried in the following order: dhcpcd, dhclient, pump and udhcpc.
105 //config: Otherwise, if udhcpc applet is enabled, it is used.
106 //config: Otherwise, ifup/ifdown will have no support for DHCP.
108 // APPLET_ODDNAME:name main location suid_type help
109 //applet:IF_IFUP( APPLET_ODDNAME(ifup, ifupdown, BB_DIR_SBIN, BB_SUID_DROP, ifup))
110 //applet:IF_IFDOWN(APPLET_ODDNAME(ifdown, ifupdown, BB_DIR_SBIN, BB_SUID_DROP, ifdown))
112 //kbuild:lib-$(CONFIG_IFUP) += ifupdown.o
113 //kbuild:lib-$(CONFIG_IFDOWN) += ifupdown.o
115 //usage:#define ifup_trivial_usage
116 //usage: "[-an"IF_FEATURE_IFUPDOWN_MAPPING("m")"vf] [-i FILE] IFACE..."
117 //usage:#define ifup_full_usage "\n\n"
118 //usage: " -a Configure all interfaces"
119 //usage: "\n -i FILE Use FILE instead of /etc/network/interfaces"
120 //usage: "\n -n Print out what would happen, but don't do it"
121 //usage: IF_FEATURE_IFUPDOWN_MAPPING(
122 //usage: "\n (note: doesn't disable mappings)"
123 //usage: "\n -m Don't run any mappings"
125 //usage: "\n -v Print out what would happen before doing it"
126 //usage: "\n -f Force configuration"
128 //usage:#define ifdown_trivial_usage
129 //usage: "[-an"IF_FEATURE_IFUPDOWN_MAPPING("m")"vf] [-i FILE] IFACE..."
130 //usage:#define ifdown_full_usage "\n\n"
131 //usage: " -a Deconfigure all interfaces"
132 //usage: "\n -i FILE Use FILE for interface definitions"
133 //usage: "\n -n Print out what would happen, but don't do it"
134 //usage: IF_FEATURE_IFUPDOWN_MAPPING(
135 //usage: "\n (note: doesn't disable mappings)"
136 //usage: "\n -m Don't run any mappings"
138 //usage: "\n -v Print out what would happen before doing it"
139 //usage: "\n -f Force deconfiguration"
143 #include "common_bufsiz.h"
144 /* After libbb.h, since it needs sys/types.h on some systems */
145 #include <sys/utsname.h>
148 #define MAX_OPT_DEPTH 10
150 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
151 #define MAX_INTERFACE_LENGTH 10
154 #define UDHCPC_CMD_OPTIONS CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS
155 #define IFSTATE_FILE_PATH CONFIG_IFUPDOWN_IFSTATE_PATH
157 #define debug_noise(args...) /*fprintf(stderr, args)*/
159 /* Forward declaration */
160 struct interface_defn_t;
162 typedef int execfn(char *command);
166 int (*up)(struct interface_defn_t *ifd, execfn *e) FAST_FUNC;
167 int (*down)(struct interface_defn_t *ifd, execfn *e) FAST_FUNC;
170 struct address_family_t {
173 const struct method_t *method;
176 struct mapping_defn_t {
177 struct mapping_defn_t *next;
194 struct interface_defn_t {
195 const struct address_family_t *address_family;
196 const struct method_t *method;
200 struct variable_t *option;
203 struct interfaces_file_t {
204 llist_t *autointerfaces;
206 struct mapping_defn_t *mappings;
210 #define OPTION_STR "anvf" IF_FEATURE_IFUPDOWN_MAPPING("m") "i:"
216 OPT_no_mappings = 0x10,
218 #define DO_ALL (option_mask32 & OPT_do_all)
219 #define NO_ACT (option_mask32 & OPT_no_act)
220 #define VERBOSE (option_mask32 & OPT_verbose)
221 #define FORCE (option_mask32 & OPT_force)
222 #define NO_MAPPINGS (option_mask32 & OPT_no_mappings)
227 const char *startup_PATH;
230 #define G (*(struct globals*)bb_common_bufsiz1)
231 #define INIT_G() do { setup_common_bufsiz(); } while (0)
234 static const char keywords_up_down[] ALIGN1 =
242 #if ENABLE_FEATURE_IFUPDOWN_IPV4 || ENABLE_FEATURE_IFUPDOWN_IPV6
244 static void addstr(char **bufp, const char *str, size_t str_length)
246 /* xasprintf trick will be smaller, but we are often
247 * called with str_length == 1 - don't want to have
248 * THAT much of malloc/freeing! */
250 int len = (buf ? strlen(buf) : 0);
252 buf = xrealloc(buf, len + str_length);
253 /* copies at most str_length-1 chars! */
254 safe_strncpy(buf + len, str, str_length);
258 static int strncmpz(const char *l, const char *r, size_t llen)
260 int i = strncmp(l, r, llen);
263 return - (unsigned char)r[llen];
267 static char *get_var(const char *id, size_t idlen, struct interface_defn_t *ifd)
271 if (strncmpz(id, "iface", idlen) == 0) {
272 // ubuntu's ifup doesn't do this:
273 //static char *label_buf;
276 //label_buf = xstrdup(ifd->iface);
277 // Remove virtual iface suffix
278 //result = strchrnul(label_buf, ':');
284 if (strncmpz(id, "label", idlen) == 0) {
287 for (i = 0; i < ifd->n_options; i++) {
288 if (strncmpz(id, ifd->option[i].name, idlen) == 0) {
289 return ifd->option[i].value;
295 # if ENABLE_FEATURE_IFUPDOWN_IP
296 static int count_netmask_bits(const char *dotted_quad)
299 // unsigned a, b, c, d;
300 // /* Found a netmask... Check if it is dotted quad */
301 // if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) != 4)
303 // if ((a|b|c|d) >> 8)
304 // return -1; /* one of numbers is >= 256 */
305 // d |= (a << 24) | (b << 16) | (c << 8); /* IP */
306 // d = ~d; /* 11110000 -> 00001111 */
308 /* Shorter version */
313 if (inet_aton(dotted_quad, &ip) == 0)
314 return -1; /* malformed dotted IP */
315 d = ntohl(ip.s_addr); /* IP in host order */
316 d = ~d; /* 11110000 -> 00001111 */
317 if (d & (d+1)) /* check that it is in 00001111 form */
318 return -1; /* no it is not */
328 static char *parse(const char *command, struct interface_defn_t *ifd)
330 size_t old_pos[MAX_OPT_DEPTH] = { 0 };
331 smallint okay[MAX_OPT_DEPTH] = { 1 };
338 addstr(&result, command, 1);
344 addstr(&result, command, 1);
348 if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) {
349 old_pos[opt_depth] = result ? strlen(result) : 0;
354 addstr(&result, command, 1);
359 if (command[1] == ']' && opt_depth > 1) {
361 if (!okay[opt_depth]) {
362 result[old_pos[opt_depth]] = '\0';
366 addstr(&result, command, 1);
376 nextpercent = strchr(command, '%');
378 /* Unterminated %var% */
383 varvalue = get_var(command, nextpercent - command, ifd);
386 # if ENABLE_FEATURE_IFUPDOWN_IP
387 /* "hwaddress <class> <address>":
388 * unlike ifconfig, ip doesnt want <class>
389 * (usually "ether" keyword). Skip it. */
390 if (is_prefixed_with(command, "hwaddress")) {
391 varvalue = skip_whitespace(skip_non_whitespace(varvalue));
394 addstr(&result, varvalue, strlen(varvalue));
396 # if ENABLE_FEATURE_IFUPDOWN_IP
397 /* Sigh... Add a special case for 'ip' to convert from
398 * dotted quad to bit count style netmasks. */
399 if (is_prefixed_with(command, "bnmask")) {
401 varvalue = get_var("netmask", 7, ifd);
403 res = count_netmask_bits(varvalue);
405 const char *argument = utoa(res);
406 addstr(&result, argument, strlen(argument));
407 command = nextpercent + 1;
413 okay[opt_depth - 1] = 0;
416 command = nextpercent + 1;
423 /* Unbalanced bracket */
429 /* Undefined variable and we aren't in a bracket */
437 /* execute() returns 1 for success and 0 for failure */
438 static int execute(const char *command, struct interface_defn_t *ifd, execfn *exec)
443 out = parse(command, ifd);
448 /* out == "": parsed ok but not all needed variables known, skip */
449 ret = out[0] ? (*exec)(out) : 1;
458 #endif /* FEATURE_IFUPDOWN_IPV4 || FEATURE_IFUPDOWN_IPV6 */
461 #if ENABLE_FEATURE_IFUPDOWN_IPV6
463 static int FAST_FUNC loopback_up6(struct interface_defn_t *ifd, execfn *exec)
465 # if ENABLE_FEATURE_IFUPDOWN_IP
467 result = execute("ip addr add ::1 dev %iface%", ifd, exec);
468 result += execute("ip link set %iface% up", ifd, exec);
469 return ((result == 2) ? 2 : 0);
471 return execute("ifconfig %iface% add ::1", ifd, exec);
475 static int FAST_FUNC loopback_down6(struct interface_defn_t *ifd, execfn *exec)
477 # if ENABLE_FEATURE_IFUPDOWN_IP
478 return execute("ip link set %iface% down", ifd, exec);
480 return execute("ifconfig %iface% del ::1", ifd, exec);
484 static int FAST_FUNC manual_up_down6(struct interface_defn_t *ifd UNUSED_PARAM, execfn *exec UNUSED_PARAM)
489 static int FAST_FUNC static_up6(struct interface_defn_t *ifd, execfn *exec)
492 # if ENABLE_FEATURE_IFUPDOWN_IP
493 result = execute("ip addr add %address%/%netmask% dev %iface%[[ label %label%]]", ifd, exec);
494 result += execute("ip link set[[ mtu %mtu%]][[ addr %hwaddress%]] %iface% up", ifd, exec);
495 /* Reportedly, IPv6 needs "dev %iface%", but IPv4 does not: */
496 result += execute("[[ip route add ::/0 via %gateway% dev %iface%]][[ metric %metric%]]", ifd, exec);
498 result = execute("ifconfig %iface%[[ media %media%]][[ hw %hwaddress%]][[ mtu %mtu%]] up", ifd, exec);
499 result += execute("ifconfig %iface% add %address%/%netmask%", ifd, exec);
500 result += execute("[[route -A inet6 add ::/0 gw %gateway%[[ metric %metric%]]]]", ifd, exec);
502 return ((result == 3) ? 3 : 0);
505 static int FAST_FUNC static_down6(struct interface_defn_t *ifd, execfn *exec)
507 if (!if_nametoindex(ifd->iface))
508 return 1; /* already gone */
509 # if ENABLE_FEATURE_IFUPDOWN_IP
510 return execute("ip link set %iface% down", ifd, exec);
512 return execute("ifconfig %iface% down", ifd, exec);
516 # if ENABLE_FEATURE_IFUPDOWN_IP
517 static int FAST_FUNC v4tunnel_up(struct interface_defn_t *ifd, execfn *exec)
520 result = execute("ip tunnel add %iface% mode sit remote "
521 "%endpoint%[[ local %local%]][[ ttl %ttl%]]", ifd, exec);
522 result += execute("ip link set %iface% up", ifd, exec);
523 result += execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec);
524 /* Reportedly, IPv6 needs "dev %iface%", but IPv4 does not: */
525 result += execute("[[ip route add ::/0 via %gateway% dev %iface%]]", ifd, exec);
526 return ((result == 4) ? 4 : 0);
529 static int FAST_FUNC v4tunnel_down(struct interface_defn_t * ifd, execfn * exec)
531 return execute("ip tunnel del %iface%", ifd, exec);
535 static const struct method_t methods6[] = {
536 # if ENABLE_FEATURE_IFUPDOWN_IP
537 { "v4tunnel" , v4tunnel_up , v4tunnel_down , },
539 { "static" , static_up6 , static_down6 , },
540 { "manual" , manual_up_down6 , manual_up_down6 , },
541 { "loopback" , loopback_up6 , loopback_down6 , },
544 static const struct address_family_t addr_inet6 = {
546 ARRAY_SIZE(methods6),
550 #endif /* FEATURE_IFUPDOWN_IPV6 */
553 #if ENABLE_FEATURE_IFUPDOWN_IPV4
555 static int FAST_FUNC loopback_up(struct interface_defn_t *ifd, execfn *exec)
557 # if ENABLE_FEATURE_IFUPDOWN_IP
559 result = execute("ip addr add 127.0.0.1/8 dev %iface%", ifd, exec);
560 result += execute("ip link set %iface% up", ifd, exec);
561 return ((result == 2) ? 2 : 0);
563 return execute("ifconfig %iface% 127.0.0.1 up", ifd, exec);
567 static int FAST_FUNC loopback_down(struct interface_defn_t *ifd, execfn *exec)
569 # if ENABLE_FEATURE_IFUPDOWN_IP
571 result = execute("ip addr flush dev %iface%", ifd, exec);
572 result += execute("ip link set %iface% down", ifd, exec);
573 return ((result == 2) ? 2 : 0);
575 return execute("ifconfig %iface% 127.0.0.1 down", ifd, exec);
579 static int FAST_FUNC static_up(struct interface_defn_t *ifd, execfn *exec)
582 # if ENABLE_FEATURE_IFUPDOWN_IP
583 result = execute("ip addr add %address%/%bnmask%[[ broadcast %broadcast%]] "
584 "dev %iface%[[ peer %pointopoint%]][[ label %label%]]", ifd, exec);
585 result += execute("ip link set[[ mtu %mtu%]][[ addr %hwaddress%]] %iface% up", ifd, exec);
586 result += execute("[[ip route add default via %gateway% dev %iface%[[ metric %metric%]]]]", ifd, exec);
587 return ((result == 3) ? 3 : 0);
589 /* ifconfig said to set iface up before it processes hw %hwaddress%,
590 * which then of course fails. Thus we run two separate ifconfig */
591 result = execute("ifconfig %iface%[[ hw %hwaddress%]][[ media %media%]][[ mtu %mtu%]] up",
593 result += execute("ifconfig %iface% %address% netmask %netmask%"
594 "[[ broadcast %broadcast%]][[ pointopoint %pointopoint%]]",
596 result += execute("[[route add default gw %gateway%[[ metric %metric%]] %iface%]]", ifd, exec);
597 return ((result == 3) ? 3 : 0);
601 static int FAST_FUNC static_down(struct interface_defn_t *ifd, execfn *exec)
605 if (!if_nametoindex(ifd->iface))
606 return 2; /* already gone */
607 # if ENABLE_FEATURE_IFUPDOWN_IP
608 /* Optional "label LBL" is necessary if interface is an alias (eth0:0),
609 * otherwise "ip addr flush dev eth0:0" flushes all addresses on eth0.
611 result = execute("ip addr flush dev %iface%[[ label %label%]]", ifd, exec);
612 result += execute("ip link set %iface% down", ifd, exec);
614 /* result = execute("[[route del default gw %gateway% %iface%]]", ifd, exec); */
615 /* Bringing the interface down deletes the routes in itself.
616 Otherwise this fails if we reference 'gateway' when using this from dhcp_down */
618 result += execute("ifconfig %iface% down", ifd, exec);
620 return ((result == 2) ? 2 : 0);
623 # if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
624 struct dhcp_client_t {
626 const char *startcmd;
630 static const struct dhcp_client_t ext_dhcp_clients[] = {
632 "dhcpcd[[ -h %hostname%]][[ -i %vendor%]][[ -I %client%]][[ -l %leasetime%]] %iface%",
636 "dhclient -pf /var/run/dhclient.%iface%.pid %iface%",
637 "kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null",
640 "pump -i %iface%[[ -h %hostname%]][[ -l %leasehours%]]",
641 "pump -i %iface% -k",
644 "udhcpc " UDHCPC_CMD_OPTIONS " -p /var/run/udhcpc.%iface%.pid -i %iface%[[ -x hostname:%hostname%]][[ -c %client%]]"
645 "[[ -s %script%]][[ %udhcpc_opts%]]",
646 "kill `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
649 # endif /* FEATURE_IFUPDOWN_EXTERNAL_DHCPC */
651 # if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
652 static int FAST_FUNC dhcp_up(struct interface_defn_t *ifd, execfn *exec)
655 # if ENABLE_FEATURE_IFUPDOWN_IP
656 /* ip doesn't up iface when it configures it (unlike ifconfig) */
657 if (!execute("ip link set[[ addr %hwaddress%]] %iface% up", ifd, exec))
660 /* needed if we have hwaddress on dhcp iface */
661 if (!execute("ifconfig %iface%[[ hw %hwaddress%]] up", ifd, exec))
664 for (i = 0; i < ARRAY_SIZE(ext_dhcp_clients); i++) {
665 if (executable_exists(ext_dhcp_clients[i].name))
666 return execute(ext_dhcp_clients[i].startcmd, ifd, exec);
668 bb_error_msg("no dhcp clients found");
672 static int FAST_FUNC dhcp_up(struct interface_defn_t *ifd, execfn *exec)
674 # if ENABLE_FEATURE_IFUPDOWN_IP
675 /* ip doesn't up iface when it configures it (unlike ifconfig) */
676 if (!execute("ip link set[[ addr %hwaddress%]] %iface% up", ifd, exec))
679 /* needed if we have hwaddress on dhcp iface */
680 if (!execute("ifconfig %iface%[[ hw %hwaddress%]] up", ifd, exec))
683 return execute("udhcpc " UDHCPC_CMD_OPTIONS " -p /var/run/udhcpc.%iface%.pid "
684 "-i %iface%[[ -x hostname:%hostname%]][[ -c %client%]][[ -s %script%]][[ %udhcpc_opts%]]",
688 static int FAST_FUNC dhcp_up(struct interface_defn_t *ifd UNUSED_PARAM,
689 execfn *exec UNUSED_PARAM)
691 return 0; /* no dhcp support */
695 # if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
696 static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd, execfn *exec)
701 for (i = 0; i < ARRAY_SIZE(ext_dhcp_clients); i++) {
702 if (executable_exists(ext_dhcp_clients[i].name)) {
703 result = execute(ext_dhcp_clients[i].stopcmd, ifd, exec);
710 bb_error_msg("warning: no dhcp clients found and stopped");
712 /* Sleep a bit, otherwise static_down tries to bring down interface too soon,
713 and it may come back up because udhcpc is still shutting down */
715 result += static_down(ifd, exec);
716 return ((result == 3) ? 3 : 0);
719 static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd, execfn *exec)
723 "test -f /var/run/udhcpc.%iface%.pid && "
724 "kill `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
726 /* Also bring the hardware interface down since
727 killing the dhcp client alone doesn't do it.
728 This enables consecutive ifup->ifdown->ifup */
729 /* Sleep a bit, otherwise static_down tries to bring down interface too soon,
730 and it may come back up because udhcpc is still shutting down */
732 result += static_down(ifd, exec);
733 return ((result == 3) ? 3 : 0);
736 static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd UNUSED_PARAM,
737 execfn *exec UNUSED_PARAM)
739 return 0; /* no dhcp support */
743 static int FAST_FUNC manual_up_down(struct interface_defn_t *ifd UNUSED_PARAM, execfn *exec UNUSED_PARAM)
748 static int FAST_FUNC bootp_up(struct interface_defn_t *ifd, execfn *exec)
750 return execute("bootpc[[ --bootfile %bootfile%]] --dev %iface%"
751 "[[ --server %server%]][[ --hwaddr %hwaddr%]]"
752 " --returniffail --serverbcast", ifd, exec);
755 static int FAST_FUNC ppp_up(struct interface_defn_t *ifd, execfn *exec)
757 return execute("pon[[ %provider%]]", ifd, exec);
760 static int FAST_FUNC ppp_down(struct interface_defn_t *ifd, execfn *exec)
762 return execute("poff[[ %provider%]]", ifd, exec);
765 static int FAST_FUNC wvdial_up(struct interface_defn_t *ifd, execfn *exec)
767 return execute("start-stop-daemon --start -x wvdial "
768 "-p /var/run/wvdial.%iface% -b -m --[[ %provider%]]", ifd, exec);
771 static int FAST_FUNC wvdial_down(struct interface_defn_t *ifd, execfn *exec)
773 return execute("start-stop-daemon --stop -x wvdial "
774 "-p /var/run/wvdial.%iface% -s 2", ifd, exec);
777 static const struct method_t methods[] = {
778 { "manual" , manual_up_down, manual_up_down, },
779 { "wvdial" , wvdial_up , wvdial_down , },
780 { "ppp" , ppp_up , ppp_down , },
781 { "static" , static_up , static_down , },
782 { "bootp" , bootp_up , static_down , },
783 { "dhcp" , dhcp_up , dhcp_down , },
784 { "loopback", loopback_up , loopback_down , },
787 static const struct address_family_t addr_inet = {
793 #endif /* FEATURE_IFUPDOWN_IPV4 */
795 static int FAST_FUNC link_up_down(struct interface_defn_t *ifd UNUSED_PARAM, execfn *exec UNUSED_PARAM)
800 static const struct method_t link_methods[] = {
801 { "none", link_up_down, link_up_down }
804 static const struct address_family_t addr_link = {
805 "link", ARRAY_SIZE(link_methods), link_methods
808 /* Returns pointer to the next word, or NULL.
809 * In 1st case, advances *buf to the word after this one.
811 static char *next_word(char **buf)
816 /* Skip over leading whitespace */
817 word = skip_whitespace(*buf);
823 /* Find the length of this word (can't be 0) */
824 length = strcspn(word, " \t\n");
826 /* Unless we are already at NUL, store NUL and advance */
827 if (word[length] != '\0')
828 word[length++] = '\0';
830 *buf = skip_whitespace(word + length);
835 static const struct address_family_t *get_address_family(const struct address_family_t *const af[], char *name)
842 for (i = 0; af[i]; i++) {
843 if (strcmp(af[i]->name, name) == 0) {
850 static const struct method_t *get_method(const struct address_family_t *af, char *name)
856 /* TODO: use index_in_str_array() */
857 for (i = 0; i < af->n_methods; i++) {
858 if (strcmp(af->method[i].name, name) == 0) {
859 return &af->method[i];
865 static struct interfaces_file_t *read_interfaces(const char *filename, struct interfaces_file_t *defn)
867 /* Let's try to be compatible.
869 * "man 5 interfaces" says:
870 * Lines starting with "#" are ignored. Note that end-of-line
871 * comments are NOT supported, comments must be on a line of their own.
872 * A line may be extended across multiple lines by making
873 * the last character a backslash.
875 * Seen elsewhere in example config file:
876 * A first non-blank "#" character makes the rest of the line
877 * be ignored. Blank lines are ignored. Lines may be indented freely.
878 * A "\" character at the very end of the line indicates the next line
879 * should be treated as a continuation of the current one.
881 * Lines beginning with "source" are used to include stanzas from
882 * other files, so configuration can be split into many files.
883 * The word "source" is followed by the path of file to be sourced.
885 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
886 struct mapping_defn_t *currmap = NULL;
888 struct interface_defn_t *currif = NULL;
893 enum { NONE, IFACE, MAPPING } currently_processing = NONE;
896 defn = xzalloc(sizeof(*defn));
898 debug_noise("reading %s file:\n", filename);
899 f = xfopen_for_read(filename);
901 while ((buf = xmalloc_fgetline(f)) != NULL) {
903 /* Trailing "\" concatenates lines */
905 while ((p = last_char_is(buf, '\\')) != NULL) {
907 rest_of_line = xmalloc_fgetline(f);
910 p = xasprintf("%s%s", buf, rest_of_line);
917 first_word = next_word(&rest_of_line);
918 if (!first_word || *first_word == '#') {
920 continue; /* blank/comment line */
923 if (strcmp(first_word, "mapping") == 0) {
924 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
925 currmap = xzalloc(sizeof(*currmap));
927 while ((first_word = next_word(&rest_of_line)) != NULL) {
928 currmap->match = xrealloc_vector(currmap->match, 4, currmap->n_matches);
929 currmap->match[currmap->n_matches++] = xstrdup(first_word);
931 /*currmap->n_mappings = 0;*/
932 /*currmap->mapping = NULL;*/
933 /*currmap->script = NULL;*/
935 struct mapping_defn_t **where = &defn->mappings;
936 while (*where != NULL) {
937 where = &(*where)->next;
940 /*currmap->next = NULL;*/
942 debug_noise("Added mapping\n");
944 currently_processing = MAPPING;
945 } else if (strcmp(first_word, "iface") == 0) {
946 static const struct address_family_t *const addr_fams[] = {
947 #if ENABLE_FEATURE_IFUPDOWN_IPV4
950 #if ENABLE_FEATURE_IFUPDOWN_IPV6
957 char *address_family_name;
960 currif = xzalloc(sizeof(*currif));
961 iface_name = next_word(&rest_of_line);
962 address_family_name = next_word(&rest_of_line);
963 method_name = next_word(&rest_of_line);
965 if (method_name == NULL)
966 bb_error_msg_and_die("too few parameters for line \"%s\"", buf);
968 /* ship any trailing whitespace */
969 rest_of_line = skip_whitespace(rest_of_line);
971 if (rest_of_line[0] != '\0' /* && rest_of_line[0] != '#' */)
972 bb_error_msg_and_die("too many parameters \"%s\"", buf);
974 currif->iface = xstrdup(iface_name);
976 currif->address_family = get_address_family(addr_fams, address_family_name);
977 if (!currif->address_family)
978 bb_error_msg_and_die("unknown address type \"%s\"", address_family_name);
980 currif->method = get_method(currif->address_family, method_name);
982 bb_error_msg_and_die("unknown method \"%s\"", method_name);
984 // Allegedly, Debian allows a duplicate definition:
985 // iface eth0 inet static
986 // address 192.168.0.15
987 // netmask 255.255.0.0
988 // gateway 192.168.0.1
990 // iface eth0 inet static
992 // netmask 255.255.255.0
994 // This adds *two* addresses to eth0 (probably requires use of "ip", not "ifconfig"
997 for (iface_list = defn->ifaces; iface_list; iface_list = iface_list->link) {
998 struct interface_defn_t *tmp = (struct interface_defn_t *) iface_list->data;
999 if ((strcmp(tmp->iface, currif->iface) == 0)
1000 && (tmp->address_family == currif->address_family)
1002 bb_error_msg_and_die("duplicate interface \"%s\"", tmp->iface);
1006 llist_add_to_end(&(defn->ifaces), (char*)currif);
1008 debug_noise("iface %s %s %s\n", currif->iface, address_family_name, method_name);
1009 currently_processing = IFACE;
1010 } else if (strcmp(first_word, "auto") == 0) {
1011 while ((first_word = next_word(&rest_of_line)) != NULL) {
1013 /* Check the interface isnt already listed */
1014 if (llist_find_str(defn->autointerfaces, first_word)) {
1015 bb_perror_msg_and_die("interface declared auto twice \"%s\"", buf);
1018 /* Add the interface to the list */
1019 llist_add_to_end(&(defn->autointerfaces), xstrdup(first_word));
1020 debug_noise("\nauto %s\n", first_word);
1022 currently_processing = NONE;
1023 } else if (strcmp(first_word, "source") == 0) {
1024 read_interfaces(next_word(&rest_of_line), defn);
1026 switch (currently_processing) {
1028 if (rest_of_line[0] == '\0')
1029 bb_error_msg_and_die("option with empty value \"%s\"", buf);
1031 if (strcmp(first_word, "post-up") == 0)
1032 first_word += 5; /* "up" */
1033 else if (strcmp(first_word, "pre-down") == 0)
1034 first_word += 4; /* "down" */
1036 /* If not one of "up", "down",... words... */
1037 if (index_in_strings(keywords_up_down, first_word) < 0) {
1039 for (i = 0; i < currif->n_options; i++) {
1040 if (strcmp(currif->option[i].name, first_word) == 0)
1041 bb_error_msg_and_die("duplicate option \"%s\"", buf);
1044 debug_noise("\t%s=%s\n", first_word, rest_of_line);
1045 currif->option = xrealloc_vector(currif->option, 4, currif->n_options);
1046 currif->option[currif->n_options].name = xstrdup(first_word);
1047 currif->option[currif->n_options].value = xstrdup(rest_of_line);
1048 currif->n_options++;
1051 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
1052 if (strcmp(first_word, "script") == 0) {
1053 if (currmap->script != NULL)
1054 bb_error_msg_and_die("duplicate script in mapping \"%s\"", buf);
1055 currmap->script = xstrdup(next_word(&rest_of_line));
1056 } else if (strcmp(first_word, "map") == 0) {
1057 currmap->mapping = xrealloc_vector(currmap->mapping, 2, currmap->n_mappings);
1058 currmap->mapping[currmap->n_mappings] = xstrdup(next_word(&rest_of_line));
1059 currmap->n_mappings++;
1061 bb_error_msg_and_die("misplaced option \"%s\"", buf);
1067 bb_error_msg_and_die("misplaced option \"%s\"", buf);
1071 } /* while (fgets) */
1073 if (ferror(f) != 0) {
1074 /* ferror does NOT set errno! */
1075 bb_error_msg_and_die("%s: I/O error", filename);
1078 debug_noise("\ndone reading %s\n\n", filename);
1083 static char *setlocalenv(const char *format, const char *name, const char *value)
1090 result = xasprintf(format, name, value);
1092 for (dst = src = result; (c = *src) != '=' && c; src++) {
1095 if (c >= 'a' && c <= 'z')
1097 if (isalnum(c) || c == '_')
1100 overlapping_strcpy(dst, src);
1105 static void set_environ(struct interface_defn_t *iface, const char *mode, const char *opt)
1110 if (G.my_environ != NULL) {
1111 for (pp = G.my_environ; *pp; pp++) {
1117 /* note: last element will stay NULL: */
1118 G.my_environ = xzalloc(sizeof(char *) * (iface->n_options + 7));
1121 for (i = 0; i < iface->n_options; i++) {
1122 if (index_in_strings(keywords_up_down, iface->option[i].name) >= 0) {
1125 *pp++ = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value);
1128 *pp++ = setlocalenv("%s=%s", "IFACE", iface->iface);
1129 *pp++ = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name);
1130 *pp++ = setlocalenv("%s=%s", "METHOD", iface->method->name);
1131 *pp++ = setlocalenv("%s=%s", "MODE", mode);
1132 *pp++ = setlocalenv("%s=%s", "PHASE", opt);
1134 *pp++ = setlocalenv("%s=%s", "PATH", G.startup_PATH);
1137 static int doit(char *str)
1139 if (option_mask32 & (OPT_no_act|OPT_verbose)) {
1142 if (!(option_mask32 & OPT_no_act)) {
1148 if (child < 0) /* failure */
1150 if (child == 0) { /* child */
1151 execle(G.shell, G.shell, "-c", str, (char *) NULL, G.my_environ);
1154 safe_waitpid(child, &status, 0);
1155 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
1162 static int execute_all(struct interface_defn_t *ifd, const char *opt)
1166 for (i = 0; i < ifd->n_options; i++) {
1167 if (strcmp(ifd->option[i].name, opt) == 0) {
1168 if (!doit(ifd->option[i].value)) {
1174 /* Tested on Debian Squeeze: "standard" ifup runs this without
1175 * checking that directory exists. If it doesn't, run-parts
1176 * complains, and this message _is_ annoyingly visible.
1177 * Don't "fix" this (unless newer Debian does).
1179 buf = xasprintf("run-parts /etc/network/if-%s.d", opt);
1180 /* heh, we don't bother free'ing it */
1184 static int check(char *str)
1189 static int iface_up(struct interface_defn_t *iface)
1191 if (!iface->method->up(iface, check)) return -1;
1192 set_environ(iface, "start", "pre-up");
1193 if (!execute_all(iface, "pre-up")) return 0;
1194 if (!iface->method->up(iface, doit)) return 0;
1195 set_environ(iface, "start", "post-up");
1196 if (!execute_all(iface, "up")) return 0;
1200 static int iface_down(struct interface_defn_t *iface)
1202 if (!iface->method->down(iface, check)) return -1;
1203 set_environ(iface, "stop", "pre-down");
1204 if (!execute_all(iface, "down")) return 0;
1205 if (!iface->method->down(iface, doit)) return 0;
1206 set_environ(iface, "stop", "post-down");
1207 if (!execute_all(iface, "post-down")) return 0;
1211 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
1212 static int popen2(FILE **in, FILE **out, char *command, char *param)
1214 char *argv[3] = { command, param, NULL };
1215 struct fd_pair infd, outfd;
1226 /* NB: close _first_, then move fds! */
1229 xmove_fd(infd.rd, 0);
1230 xmove_fd(outfd.wr, 1);
1231 BB_EXECVP_or_die(argv);
1236 *in = xfdopen_for_write(infd.wr);
1237 *out = xfdopen_for_read(outfd.rd);
1241 static char *run_mapping(char *physical, struct mapping_defn_t *map)
1247 char *logical = xstrdup(physical);
1249 /* Run the mapping script. Never fails. */
1250 pid = popen2(&in, &out, map->script, physical);
1252 /* Write mappings to stdin of mapping script. */
1253 for (i = 0; i < map->n_mappings; i++) {
1254 fprintf(in, "%s\n", map->mapping[i]);
1257 safe_waitpid(pid, &status, 0);
1259 if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
1260 /* If the mapping script exited successfully, try to
1261 * grab a line of output and use that as the name of the
1262 * logical interface. */
1263 char *new_logical = xmalloc_fgetline(out);
1266 /* If we are able to read a line of output from the script,
1267 * remove any trailing whitespace and use this value
1268 * as the name of the logical interface. */
1269 char *pch = new_logical + strlen(new_logical) - 1;
1271 while (pch >= new_logical && isspace(*pch))
1275 logical = new_logical;
1283 #endif /* FEATURE_IFUPDOWN_MAPPING */
1285 static llist_t *find_iface_state(llist_t *state_list, const char *iface)
1287 llist_t *search = state_list;
1290 char *after_iface = is_prefixed_with(search->data, iface);
1292 && *after_iface == '='
1296 search = search->link;
1301 /* read the previous state from the state file */
1302 static llist_t *read_iface_state(void)
1304 llist_t *state_list = NULL;
1305 FILE *state_fp = fopen_for_read(IFSTATE_FILE_PATH);
1308 char *start, *end_ptr;
1309 while ((start = xmalloc_fgets(state_fp)) != NULL) {
1310 /* We should only need to check for a single character */
1311 end_ptr = start + strcspn(start, " \t\n");
1313 llist_add_to(&state_list, start);
1320 /* read the previous state from the state file */
1321 static FILE *open_new_state_file(void)
1326 flags = (O_WRONLY | O_CREAT | O_EXCL);
1328 fd = open(IFSTATE_FILE_PATH".new", flags, 0666);
1332 || flags == (O_WRONLY | O_CREAT | O_TRUNC)
1334 bb_perror_msg_and_die("can't open '%s'",
1335 IFSTATE_FILE_PATH".new");
1337 /* Someone else created the .new file */
1338 if (cnt > 30 * 1000) {
1339 /* Waited for 30*30/2 = 450 milliseconds, still EEXIST.
1340 * Assuming a stale file, rewriting it.
1342 flags = (O_WRONLY | O_CREAT | O_TRUNC);
1349 return xfdopen_for_write(fd);
1352 int ifupdown_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1353 int ifupdown_main(int argc UNUSED_PARAM, char **argv)
1355 int (*cmds)(struct interface_defn_t *);
1356 struct interfaces_file_t *defn;
1357 llist_t *target_list = NULL;
1358 const char *interfaces = "/etc/network/interfaces";
1359 bool any_failures = 0;
1363 G.startup_PATH = getenv("PATH");
1364 G.shell = xstrdup(get_shell_name());
1367 && (!ENABLE_IFDOWN || applet_name[2] == 'u')
1375 getopt32(argv, OPTION_STR, &interfaces);
1378 if (DO_ALL) bb_show_usage();
1380 if (!DO_ALL) bb_show_usage();
1383 defn = read_interfaces(interfaces, NULL);
1385 /* Create a list of interfaces to work on */
1387 target_list = defn->autointerfaces;
1389 llist_add_to_end(&target_list, argv[0]);
1392 /* Update the interfaces */
1393 while (target_list) {
1394 llist_t *iface_list;
1395 struct interface_defn_t *currif;
1401 bool curr_failure = 0;
1403 iface = xstrdup(target_list->data);
1404 target_list = target_list->link;
1406 pch = strchr(iface, '=');
1409 liface = xstrdup(pch + 1);
1411 liface = xstrdup(iface);
1415 llist_t *state_list = read_iface_state();
1416 const llist_t *iface_state = find_iface_state(state_list, iface);
1418 if (cmds == iface_up) {
1421 bb_error_msg("interface %s already configured", iface);
1427 bb_error_msg("interface %s not configured", iface);
1431 llist_free(state_list, free);
1434 #if ENABLE_FEATURE_IFUPDOWN_MAPPING
1435 if ((cmds == iface_up) && !NO_MAPPINGS) {
1436 struct mapping_defn_t *currmap;
1438 for (currmap = defn->mappings; currmap; currmap = currmap->next) {
1440 for (i = 0; i < currmap->n_matches; i++) {
1441 if (fnmatch(currmap->match[i], liface, 0) != 0)
1444 printf("Running mapping script %s on %s\n", currmap->script, liface);
1446 liface = run_mapping(iface, currmap);
1453 iface_list = defn->ifaces;
1454 while (iface_list) {
1455 currif = (struct interface_defn_t *) iface_list->data;
1456 if (strcmp(liface, currif->iface) == 0) {
1457 char *oldiface = currif->iface;
1460 currif->iface = iface;
1462 debug_noise("\nConfiguring interface %s (%s)\n", liface, currif->address_family->name);
1464 /* Call the cmds function pointer, does either iface_up() or iface_down() */
1465 cmds_ret = cmds(currif);
1466 if (cmds_ret == -1) {
1467 bb_error_msg("don't have all variables for %s/%s",
1468 liface, currif->address_family->name);
1469 any_failures = curr_failure = 1;
1470 } else if (cmds_ret == 0) {
1471 any_failures = curr_failure = 1;
1474 currif->iface = oldiface;
1476 iface_list = iface_list->link;
1482 if (!okay && !FORCE) {
1483 bb_error_msg("ignoring unknown interface %s", liface);
1485 } else if (!NO_ACT) {
1486 /* update the state file */
1487 FILE *new_state_fp = open_new_state_file();
1489 llist_t *state_list = read_iface_state();
1490 llist_t *iface_state = find_iface_state(state_list, iface);
1492 if (cmds == iface_up && !curr_failure) {
1493 char *newiface = xasprintf("%s=%s", iface, liface);
1495 llist_add_to_end(&state_list, newiface);
1497 free(iface_state->data);
1498 iface_state->data = newiface;
1501 /* Remove an interface from state_list */
1502 llist_unlink(&state_list, iface_state);
1503 free(llist_pop(&iface_state));
1506 /* Actually write the new state */
1510 fprintf(new_state_fp, "%s\n", state->data);
1512 state = state->link;
1514 fclose(new_state_fp);
1515 xrename(IFSTATE_FILE_PATH".new", IFSTATE_FILE_PATH);
1516 llist_free(state_list, free);
1523 return any_failures;