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path: root/networking/ifupdown.c (plain)
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1/* vi: set sw=4 ts=4: */
2/*
3 * ifup/ifdown for busybox
4 * Copyright (c) 2002 Glenn McGrath
5 * Copyright (c) 2003-2004 Erik Andersen <andersen@codepoet.org>
6 *
7 * Based on ifupdown v 0.6.4 by Anthony Towns
8 * Copyright (c) 1999 Anthony Towns <aj@azure.humbug.org.au>
9 *
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
15 * configuration.
16 *
17 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
18 */
19
20//config:config IFUP
21//config: bool "ifup"
22//config: default y
23//config: help
24//config: Activate the specified interfaces. This applet makes use
25//config: of either "ifconfig" and "route" or the "ip" command to actually
26//config: configure network interfaces. Therefore, you will probably also want
27//config: to enable either IFCONFIG and ROUTE, or enable
28//config: FEATURE_IFUPDOWN_IP and the various IP options. Of
29//config: course you could use non-busybox versions of these programs, so
30//config: against my better judgement (since this will surely result in plenty
31//config: of support questions on the mailing list), I do not force you to
32//config: enable these additional options. It is up to you to supply either
33//config: "ifconfig", "route" and "run-parts" or the "ip" command, either
34//config: via busybox or via standalone utilities.
35//config:
36//config:config IFDOWN
37//config: bool "ifdown"
38//config: default y
39//config: help
40//config: Deactivate the specified interfaces.
41//config:
42//config:config IFUPDOWN_IFSTATE_PATH
43//config: string "Absolute path to ifstate file"
44//config: default "/var/run/ifstate"
45//config: depends on IFUP || IFDOWN
46//config: help
47//config: ifupdown keeps state information in a file called ifstate.
48//config: Typically it is located in /var/run/ifstate, however
49//config: some distributions tend to put it in other places
50//config: (debian, for example, uses /etc/network/run/ifstate).
51//config: This config option defines location of ifstate.
52//config:
53//config:config FEATURE_IFUPDOWN_IP
54//config: bool "Use ip tool (else ifconfig/route is used)"
55//config: default y
56//config: depends on IFUP || IFDOWN
57//config: help
58//config: Use the iproute "ip" command to implement "ifup" and "ifdown", rather
59//config: than the default of using the older "ifconfig" and "route" utilities.
60//config:
61//config: If Y: you must install either the full-blown iproute2 package
62//config: or enable "ip" applet in Busybox, or the "ifup" and "ifdown" applets
63//config: will not work.
64//config:
65//config: If N: you must install either the full-blown ifconfig and route
66//config: utilities, or enable these applets in Busybox.
67//config:
68//config:config FEATURE_IFUPDOWN_IPV4
69//config: bool "Support for IPv4"
70//config: default y
71//config: depends on IFUP || IFDOWN
72//config: help
73//config: If you want ifup/ifdown to talk IPv4, leave this on.
74//config:
75//config:config FEATURE_IFUPDOWN_IPV6
76//config: bool "Support for IPv6"
77//config: default y
78//config: depends on (IFUP || IFDOWN) && FEATURE_IPV6
79//config: help
80//config: If you need support for IPv6, turn this option on.
81//config:
82//UNUSED:
83////////:config FEATURE_IFUPDOWN_IPX
84////////: bool "Support for IPX"
85////////: default y
86////////: depends on IFUP || IFDOWN
87////////: help
88////////: If this option is selected you can use busybox to work with IPX
89////////: networks.
90//config:
91//config:config FEATURE_IFUPDOWN_MAPPING
92//config: bool "Enable mapping support"
93//config: default y
94//config: depends on IFUP || IFDOWN
95//config: help
96//config: This enables support for the "mapping" stanza, unless you have
97//config: a weird network setup you don't need it.
98//config:
99//config:config FEATURE_IFUPDOWN_EXTERNAL_DHCP
100//config: bool "Support for external dhcp clients"
101//config: default n
102//config: depends on IFUP || IFDOWN
103//config: help
104//config: This enables support for the external dhcp clients. Clients are
105//config: tried in the following order: dhcpcd, dhclient, pump and udhcpc.
106//config: Otherwise, if udhcpc applet is enabled, it is used.
107//config: Otherwise, ifup/ifdown will have no support for DHCP.
108
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))
111
112//kbuild:lib-$(CONFIG_IFUP) += ifupdown.o
113//kbuild:lib-$(CONFIG_IFDOWN) += ifupdown.o
114
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"
124//usage: )
125//usage: "\n -v Print out what would happen before doing it"
126//usage: "\n -f Force configuration"
127//usage:
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"
137//usage: )
138//usage: "\n -v Print out what would happen before doing it"
139//usage: "\n -f Force deconfiguration"
140
141#include "libbb.h"
142#include "common_bufsiz.h"
143/* After libbb.h, since it needs sys/types.h on some systems */
144#include <sys/utsname.h>
145#include <fnmatch.h>
146
147#define MAX_OPT_DEPTH 10
148
149#if ENABLE_FEATURE_IFUPDOWN_MAPPING
150#define MAX_INTERFACE_LENGTH 10
151#endif
152
153#define UDHCPC_CMD_OPTIONS CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS
154#define IFSTATE_FILE_PATH CONFIG_IFUPDOWN_IFSTATE_PATH
155
156#define debug_noise(args...) /*fprintf(stderr, args)*/
157
158/* Forward declaration */
159struct interface_defn_t;
160
161typedef int execfn(char *command);
162
163struct method_t {
164 const char *name;
165 int (*up)(struct interface_defn_t *ifd, execfn *e) FAST_FUNC;
166 int (*down)(struct interface_defn_t *ifd, execfn *e) FAST_FUNC;
167};
168
169struct address_family_t {
170 const char *name;
171 int n_methods;
172 const struct method_t *method;
173};
174
175struct mapping_defn_t {
176 struct mapping_defn_t *next;
177
178 int max_matches;
179 int n_matches;
180 char **match;
181
182 char *script;
183
184 int n_mappings;
185 char **mapping;
186};
187
188struct variable_t {
189 char *name;
190 char *value;
191};
192
193struct interface_defn_t {
194 const struct address_family_t *address_family;
195 const struct method_t *method;
196
197 char *iface;
198 int n_options;
199 struct variable_t *option;
200};
201
202struct interfaces_file_t {
203 llist_t *autointerfaces;
204 llist_t *ifaces;
205 struct mapping_defn_t *mappings;
206};
207
208
209#define OPTION_STR "anvf" IF_FEATURE_IFUPDOWN_MAPPING("m") "i:"
210enum {
211 OPT_do_all = 0x1,
212 OPT_no_act = 0x2,
213 OPT_verbose = 0x4,
214 OPT_force = 0x8,
215 OPT_no_mappings = 0x10,
216};
217#define DO_ALL (option_mask32 & OPT_do_all)
218#define NO_ACT (option_mask32 & OPT_no_act)
219#define VERBOSE (option_mask32 & OPT_verbose)
220#define FORCE (option_mask32 & OPT_force)
221#define NO_MAPPINGS (option_mask32 & OPT_no_mappings)
222
223
224struct globals {
225 char **my_environ;
226 const char *startup_PATH;
227 char *shell;
228} FIX_ALIASING;
229#define G (*(struct globals*)bb_common_bufsiz1)
230#define INIT_G() do { setup_common_bufsiz(); } while (0)
231
232
233static const char keywords_up_down[] ALIGN1 =
234 "up\0"
235 "down\0"
236 "pre-up\0"
237 "post-down\0"
238;
239
240
241#if ENABLE_FEATURE_IFUPDOWN_IPV4 || ENABLE_FEATURE_IFUPDOWN_IPV6
242
243static void addstr(char **bufp, const char *str, size_t str_length)
244{
245 /* xasprintf trick will be smaller, but we are often
246 * called with str_length == 1 - don't want to have
247 * THAT much of malloc/freeing! */
248 char *buf = *bufp;
249 int len = (buf ? strlen(buf) : 0);
250 str_length++;
251 buf = xrealloc(buf, len + str_length);
252 /* copies at most str_length-1 chars! */
253 safe_strncpy(buf + len, str, str_length);
254 *bufp = buf;
255}
256
257static int strncmpz(const char *l, const char *r, size_t llen)
258{
259 int i = strncmp(l, r, llen);
260
261 if (i == 0)
262 return - (unsigned char)r[llen];
263 return i;
264}
265
266static char *get_var(const char *id, size_t idlen, struct interface_defn_t *ifd)
267{
268 int i;
269
270 if (strncmpz(id, "iface", idlen) == 0) {
271 // ubuntu's ifup doesn't do this:
272 //static char *label_buf;
273 //char *result;
274 //free(label_buf);
275 //label_buf = xstrdup(ifd->iface);
276 // Remove virtual iface suffix
277 //result = strchrnul(label_buf, ':');
278 //*result = '\0';
279 //return label_buf;
280
281 return ifd->iface;
282 }
283 if (strncmpz(id, "label", idlen) == 0) {
284 return ifd->iface;
285 }
286 for (i = 0; i < ifd->n_options; i++) {
287 if (strncmpz(id, ifd->option[i].name, idlen) == 0) {
288 return ifd->option[i].value;
289 }
290 }
291 return NULL;
292}
293
294# if ENABLE_FEATURE_IFUPDOWN_IP
295static int count_netmask_bits(const char *dotted_quad)
296{
297// int result;
298// unsigned a, b, c, d;
299// /* Found a netmask... Check if it is dotted quad */
300// if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) != 4)
301// return -1;
302// if ((a|b|c|d) >> 8)
303// return -1; /* one of numbers is >= 256 */
304// d |= (a << 24) | (b << 16) | (c << 8); /* IP */
305// d = ~d; /* 11110000 -> 00001111 */
306
307 /* Shorter version */
308 int result;
309 struct in_addr ip;
310 unsigned d;
311
312 if (inet_aton(dotted_quad, &ip) == 0)
313 return -1; /* malformed dotted IP */
314 d = ntohl(ip.s_addr); /* IP in host order */
315 d = ~d; /* 11110000 -> 00001111 */
316 if (d & (d+1)) /* check that it is in 00001111 form */
317 return -1; /* no it is not */
318 result = 32;
319 while (d) {
320 d >>= 1;
321 result--;
322 }
323 return result;
324}
325# endif
326
327static char *parse(const char *command, struct interface_defn_t *ifd)
328{
329 size_t old_pos[MAX_OPT_DEPTH] = { 0 };
330 smallint okay[MAX_OPT_DEPTH] = { 1 };
331 int opt_depth = 1;
332 char *result = NULL;
333
334 while (*command) {
335 switch (*command) {
336 default:
337 addstr(&result, command, 1);
338 command++;
339 break;
340 case '\\':
341 if (command[1])
342 command++;
343 addstr(&result, command, 1);
344 command++;
345 break;
346 case '[':
347 if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) {
348 old_pos[opt_depth] = result ? strlen(result) : 0;
349 okay[opt_depth] = 1;
350 opt_depth++;
351 command += 2;
352 } else {
353 addstr(&result, command, 1);
354 command++;
355 }
356 break;
357 case ']':
358 if (command[1] == ']' && opt_depth > 1) {
359 opt_depth--;
360 if (!okay[opt_depth]) {
361 result[old_pos[opt_depth]] = '\0';
362 }
363 command += 2;
364 } else {
365 addstr(&result, command, 1);
366 command++;
367 }
368 break;
369 case '%':
370 {
371 char *nextpercent;
372 char *varvalue;
373
374 command++;
375 nextpercent = strchr(command, '%');
376 if (!nextpercent) {
377 /* Unterminated %var% */
378 free(result);
379 return NULL;
380 }
381
382 varvalue = get_var(command, nextpercent - command, ifd);
383
384 if (varvalue) {
385# if ENABLE_FEATURE_IFUPDOWN_IP
386 /* "hwaddress <class> <address>":
387 * unlike ifconfig, ip doesnt want <class>
388 * (usually "ether" keyword). Skip it. */
389 if (is_prefixed_with(command, "hwaddress")) {
390 varvalue = skip_whitespace(skip_non_whitespace(varvalue));
391 }
392# endif
393 addstr(&result, varvalue, strlen(varvalue));
394 } else {
395# if ENABLE_FEATURE_IFUPDOWN_IP
396 /* Sigh... Add a special case for 'ip' to convert from
397 * dotted quad to bit count style netmasks. */
398 if (is_prefixed_with(command, "bnmask")) {
399 unsigned res;
400 varvalue = get_var("netmask", 7, ifd);
401 if (varvalue) {
402 res = count_netmask_bits(varvalue);
403 if (res > 0) {
404 const char *argument = utoa(res);
405 addstr(&result, argument, strlen(argument));
406 command = nextpercent + 1;
407 break;
408 }
409 }
410 }
411# endif
412 okay[opt_depth - 1] = 0;
413 }
414
415 command = nextpercent + 1;
416 }
417 break;
418 }
419 }
420
421 if (opt_depth > 1) {
422 /* Unbalanced bracket */
423 free(result);
424 return NULL;
425 }
426
427 if (!okay[0]) {
428 /* Undefined variable and we aren't in a bracket */
429 free(result);
430 return NULL;
431 }
432
433 return result;
434}
435
436/* execute() returns 1 for success and 0 for failure */
437static int execute(const char *command, struct interface_defn_t *ifd, execfn *exec)
438{
439 char *out;
440 int ret;
441
442 out = parse(command, ifd);
443 if (!out) {
444 /* parse error? */
445 return 0;
446 }
447 /* out == "": parsed ok but not all needed variables known, skip */
448 ret = out[0] ? (*exec)(out) : 1;
449
450 free(out);
451 if (ret != 1) {
452 return 0;
453 }
454 return 1;
455}
456
457#endif /* FEATURE_IFUPDOWN_IPV4 || FEATURE_IFUPDOWN_IPV6 */
458
459
460#if ENABLE_FEATURE_IFUPDOWN_IPV6
461
462static int FAST_FUNC loopback_up6(struct interface_defn_t *ifd, execfn *exec)
463{
464# if ENABLE_FEATURE_IFUPDOWN_IP
465 int result;
466 result = execute("ip addr add ::1 dev %iface%", ifd, exec);
467 result += execute("ip link set %iface% up", ifd, exec);
468 return ((result == 2) ? 2 : 0);
469# else
470 return execute("ifconfig %iface% add ::1", ifd, exec);
471# endif
472}
473
474static int FAST_FUNC loopback_down6(struct interface_defn_t *ifd, execfn *exec)
475{
476# if ENABLE_FEATURE_IFUPDOWN_IP
477 return execute("ip link set %iface% down", ifd, exec);
478# else
479 return execute("ifconfig %iface% del ::1", ifd, exec);
480# endif
481}
482
483static int FAST_FUNC manual_up_down6(struct interface_defn_t *ifd UNUSED_PARAM, execfn *exec UNUSED_PARAM)
484{
485 return 1;
486}
487
488static int FAST_FUNC static_up6(struct interface_defn_t *ifd, execfn *exec)
489{
490 int result;
491# if ENABLE_FEATURE_IFUPDOWN_IP
492 result = execute("ip addr add %address%/%netmask% dev %iface%[[ label %label%]]", ifd, exec);
493 result += execute("ip link set[[ mtu %mtu%]][[ addr %hwaddress%]] %iface% up", ifd, exec);
494 /* Reportedly, IPv6 needs "dev %iface%", but IPv4 does not: */
495 result += execute("[[ip route add ::/0 via %gateway% dev %iface%]][[ metric %metric%]]", ifd, exec);
496# else
497 result = execute("ifconfig %iface%[[ media %media%]][[ hw %hwaddress%]][[ mtu %mtu%]] up", ifd, exec);
498 result += execute("ifconfig %iface% add %address%/%netmask%", ifd, exec);
499 result += execute("[[route -A inet6 add ::/0 gw %gateway%[[ metric %metric%]]]]", ifd, exec);
500# endif
501 return ((result == 3) ? 3 : 0);
502}
503
504static int FAST_FUNC static_down6(struct interface_defn_t *ifd, execfn *exec)
505{
506# if ENABLE_FEATURE_IFUPDOWN_IP
507 return execute("ip link set %iface% down", ifd, exec);
508# else
509 return execute("ifconfig %iface% down", ifd, exec);
510# endif
511}
512
513# if ENABLE_FEATURE_IFUPDOWN_IP
514static int FAST_FUNC v4tunnel_up(struct interface_defn_t *ifd, execfn *exec)
515{
516 int result;
517 result = execute("ip tunnel add %iface% mode sit remote "
518 "%endpoint%[[ local %local%]][[ ttl %ttl%]]", ifd, exec);
519 result += execute("ip link set %iface% up", ifd, exec);
520 result += execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec);
521 /* Reportedly, IPv6 needs "dev %iface%", but IPv4 does not: */
522 result += execute("[[ip route add ::/0 via %gateway% dev %iface%]]", ifd, exec);
523 return ((result == 4) ? 4 : 0);
524}
525
526static int FAST_FUNC v4tunnel_down(struct interface_defn_t * ifd, execfn * exec)
527{
528 return execute("ip tunnel del %iface%", ifd, exec);
529}
530# endif
531
532static const struct method_t methods6[] = {
533# if ENABLE_FEATURE_IFUPDOWN_IP
534 { "v4tunnel" , v4tunnel_up , v4tunnel_down , },
535# endif
536 { "static" , static_up6 , static_down6 , },
537 { "manual" , manual_up_down6 , manual_up_down6 , },
538 { "loopback" , loopback_up6 , loopback_down6 , },
539};
540
541static const struct address_family_t addr_inet6 = {
542 "inet6",
543 ARRAY_SIZE(methods6),
544 methods6
545};
546
547#endif /* FEATURE_IFUPDOWN_IPV6 */
548
549
550#if ENABLE_FEATURE_IFUPDOWN_IPV4
551
552static int FAST_FUNC loopback_up(struct interface_defn_t *ifd, execfn *exec)
553{
554# if ENABLE_FEATURE_IFUPDOWN_IP
555 int result;
556 result = execute("ip addr add 127.0.0.1/8 dev %iface%", ifd, exec);
557 result += execute("ip link set %iface% up", ifd, exec);
558 return ((result == 2) ? 2 : 0);
559# else
560 return execute("ifconfig %iface% 127.0.0.1 up", ifd, exec);
561# endif
562}
563
564static int FAST_FUNC loopback_down(struct interface_defn_t *ifd, execfn *exec)
565{
566# if ENABLE_FEATURE_IFUPDOWN_IP
567 int result;
568 result = execute("ip addr flush dev %iface%", ifd, exec);
569 result += execute("ip link set %iface% down", ifd, exec);
570 return ((result == 2) ? 2 : 0);
571# else
572 return execute("ifconfig %iface% 127.0.0.1 down", ifd, exec);
573# endif
574}
575
576static int FAST_FUNC static_up(struct interface_defn_t *ifd, execfn *exec)
577{
578 int result;
579# if ENABLE_FEATURE_IFUPDOWN_IP
580 result = execute("ip addr add %address%/%bnmask%[[ broadcast %broadcast%]] "
581 "dev %iface%[[ peer %pointopoint%]][[ label %label%]]", ifd, exec);
582 result += execute("ip link set[[ mtu %mtu%]][[ addr %hwaddress%]] %iface% up", ifd, exec);
583 result += execute("[[ip route add default via %gateway% dev %iface%[[ metric %metric%]]]]", ifd, exec);
584 return ((result == 3) ? 3 : 0);
585# else
586 /* ifconfig said to set iface up before it processes hw %hwaddress%,
587 * which then of course fails. Thus we run two separate ifconfig */
588 result = execute("ifconfig %iface%[[ hw %hwaddress%]][[ media %media%]][[ mtu %mtu%]] up",
589 ifd, exec);
590 result += execute("ifconfig %iface% %address% netmask %netmask%"
591 "[[ broadcast %broadcast%]][[ pointopoint %pointopoint%]]",
592 ifd, exec);
593 result += execute("[[route add default gw %gateway%[[ metric %metric%]] %iface%]]", ifd, exec);
594 return ((result == 3) ? 3 : 0);
595# endif
596}
597
598static int FAST_FUNC static_down(struct interface_defn_t *ifd, execfn *exec)
599{
600 int result;
601# if ENABLE_FEATURE_IFUPDOWN_IP
602 /* Optional "label LBL" is necessary if interface is an alias (eth0:0),
603 * otherwise "ip addr flush dev eth0:0" flushes all addresses on eth0.
604 */
605 result = execute("ip addr flush dev %iface%[[ label %label%]]", ifd, exec);
606 result += execute("ip link set %iface% down", ifd, exec);
607# else
608 /* result = execute("[[route del default gw %gateway% %iface%]]", ifd, exec); */
609 /* Bringing the interface down deletes the routes in itself.
610 Otherwise this fails if we reference 'gateway' when using this from dhcp_down */
611 result = 1;
612 result += execute("ifconfig %iface% down", ifd, exec);
613# endif
614 return ((result == 2) ? 2 : 0);
615}
616
617# if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
618struct dhcp_client_t {
619 const char *name;
620 const char *startcmd;
621 const char *stopcmd;
622};
623
624static const struct dhcp_client_t ext_dhcp_clients[] = {
625 { "dhcpcd",
626 "dhcpcd[[ -h %hostname%]][[ -i %vendor%]][[ -I %client%]][[ -l %leasetime%]] %iface%",
627 "dhcpcd -k %iface%",
628 },
629 { "dhclient",
630 "dhclient -pf /var/run/dhclient.%iface%.pid %iface%",
631 "kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null",
632 },
633 { "pump",
634 "pump -i %iface%[[ -h %hostname%]][[ -l %leasehours%]]",
635 "pump -i %iface% -k",
636 },
637 { "udhcpc",
638 "udhcpc " UDHCPC_CMD_OPTIONS " -p /var/run/udhcpc.%iface%.pid -i %iface%[[ -x hostname:%hostname%]][[ -c %client%]]"
639 "[[ -s %script%]][[ %udhcpc_opts%]]",
640 "kill `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
641 },
642};
643# endif /* FEATURE_IFUPDOWN_EXTERNAL_DHCPC */
644
645# if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
646static int FAST_FUNC dhcp_up(struct interface_defn_t *ifd, execfn *exec)
647{
648 unsigned i;
649# if ENABLE_FEATURE_IFUPDOWN_IP
650 /* ip doesn't up iface when it configures it (unlike ifconfig) */
651 if (!execute("ip link set[[ addr %hwaddress%]] %iface% up", ifd, exec))
652 return 0;
653# else
654 /* needed if we have hwaddress on dhcp iface */
655 if (!execute("ifconfig %iface%[[ hw %hwaddress%]] up", ifd, exec))
656 return 0;
657# endif
658 for (i = 0; i < ARRAY_SIZE(ext_dhcp_clients); i++) {
659 if (executable_exists(ext_dhcp_clients[i].name))
660 return execute(ext_dhcp_clients[i].startcmd, ifd, exec);
661 }
662 bb_error_msg("no dhcp clients found");
663 return 0;
664}
665# elif ENABLE_UDHCPC
666static int FAST_FUNC dhcp_up(struct interface_defn_t *ifd, execfn *exec)
667{
668# if ENABLE_FEATURE_IFUPDOWN_IP
669 /* ip doesn't up iface when it configures it (unlike ifconfig) */
670 if (!execute("ip link set[[ addr %hwaddress%]] %iface% up", ifd, exec))
671 return 0;
672# else
673 /* needed if we have hwaddress on dhcp iface */
674 if (!execute("ifconfig %iface%[[ hw %hwaddress%]] up", ifd, exec))
675 return 0;
676# endif
677 return execute("udhcpc " UDHCPC_CMD_OPTIONS " -p /var/run/udhcpc.%iface%.pid "
678 "-i %iface%[[ -x hostname:%hostname%]][[ -c %client%]][[ -s %script%]][[ %udhcpc_opts%]]",
679 ifd, exec);
680}
681# else
682static int FAST_FUNC dhcp_up(struct interface_defn_t *ifd UNUSED_PARAM,
683 execfn *exec UNUSED_PARAM)
684{
685 return 0; /* no dhcp support */
686}
687# endif
688
689# if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
690static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd, execfn *exec)
691{
692 int result = 0;
693 unsigned i;
694
695 for (i = 0; i < ARRAY_SIZE(ext_dhcp_clients); i++) {
696 if (executable_exists(ext_dhcp_clients[i].name)) {
697 result = execute(ext_dhcp_clients[i].stopcmd, ifd, exec);
698 if (result)
699 break;
700 }
701 }
702
703 if (!result)
704 bb_error_msg("warning: no dhcp clients found and stopped");
705
706 /* Sleep a bit, otherwise static_down tries to bring down interface too soon,
707 and it may come back up because udhcpc is still shutting down */
708 usleep(100000);
709 result += static_down(ifd, exec);
710 return ((result == 3) ? 3 : 0);
711}
712# elif ENABLE_UDHCPC
713static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd, execfn *exec)
714{
715 int result;
716 result = execute(
717 "test -f /var/run/udhcpc.%iface%.pid && "
718 "kill `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
719 ifd, exec);
720 /* Also bring the hardware interface down since
721 killing the dhcp client alone doesn't do it.
722 This enables consecutive ifup->ifdown->ifup */
723 /* Sleep a bit, otherwise static_down tries to bring down interface too soon,
724 and it may come back up because udhcpc is still shutting down */
725 usleep(100000);
726 result += static_down(ifd, exec);
727 return ((result == 3) ? 3 : 0);
728}
729# else
730static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd UNUSED_PARAM,
731 execfn *exec UNUSED_PARAM)
732{
733 return 0; /* no dhcp support */
734}
735# endif
736
737static int FAST_FUNC manual_up_down(struct interface_defn_t *ifd UNUSED_PARAM, execfn *exec UNUSED_PARAM)
738{
739 return 1;
740}
741
742static int FAST_FUNC bootp_up(struct interface_defn_t *ifd, execfn *exec)
743{
744 return execute("bootpc[[ --bootfile %bootfile%]] --dev %iface%"
745 "[[ --server %server%]][[ --hwaddr %hwaddr%]]"
746 " --returniffail --serverbcast", ifd, exec);
747}
748
749static int FAST_FUNC ppp_up(struct interface_defn_t *ifd, execfn *exec)
750{
751 return execute("pon[[ %provider%]]", ifd, exec);
752}
753
754static int FAST_FUNC ppp_down(struct interface_defn_t *ifd, execfn *exec)
755{
756 return execute("poff[[ %provider%]]", ifd, exec);
757}
758
759static int FAST_FUNC wvdial_up(struct interface_defn_t *ifd, execfn *exec)
760{
761 return execute("start-stop-daemon --start -x wvdial "
762 "-p /var/run/wvdial.%iface% -b -m --[[ %provider%]]", ifd, exec);
763}
764
765static int FAST_FUNC wvdial_down(struct interface_defn_t *ifd, execfn *exec)
766{
767 return execute("start-stop-daemon --stop -x wvdial "
768 "-p /var/run/wvdial.%iface% -s 2", ifd, exec);
769}
770
771static const struct method_t methods[] = {
772 { "manual" , manual_up_down, manual_up_down, },
773 { "wvdial" , wvdial_up , wvdial_down , },
774 { "ppp" , ppp_up , ppp_down , },
775 { "static" , static_up , static_down , },
776 { "bootp" , bootp_up , static_down , },
777 { "dhcp" , dhcp_up , dhcp_down , },
778 { "loopback", loopback_up , loopback_down , },
779};
780
781static const struct address_family_t addr_inet = {
782 "inet",
783 ARRAY_SIZE(methods),
784 methods
785};
786
787#endif /* FEATURE_IFUPDOWN_IPV4 */
788
789static int FAST_FUNC link_up_down(struct interface_defn_t *ifd UNUSED_PARAM, execfn *exec UNUSED_PARAM)
790{
791 return 1;
792}
793
794static const struct method_t link_methods[] = {
795 { "none", link_up_down, link_up_down }
796};
797
798static const struct address_family_t addr_link = {
799 "link", ARRAY_SIZE(link_methods), link_methods
800};
801
802/* Returns pointer to the next word, or NULL.
803 * In 1st case, advances *buf to the word after this one.
804 */
805static char *next_word(char **buf)
806{
807 unsigned length;
808 char *word;
809
810 /* Skip over leading whitespace */
811 word = skip_whitespace(*buf);
812
813 /* Stop on EOL */
814 if (*word == '\0')
815 return NULL;
816
817 /* Find the length of this word (can't be 0) */
818 length = strcspn(word, " \t\n");
819
820 /* Unless we are already at NUL, store NUL and advance */
821 if (word[length] != '\0')
822 word[length++] = '\0';
823
824 *buf = skip_whitespace(word + length);
825
826 return word;
827}
828
829static const struct address_family_t *get_address_family(const struct address_family_t *const af[], char *name)
830{
831 int i;
832
833 if (!name)
834 return NULL;
835
836 for (i = 0; af[i]; i++) {
837 if (strcmp(af[i]->name, name) == 0) {
838 return af[i];
839 }
840 }
841 return NULL;
842}
843
844static const struct method_t *get_method(const struct address_family_t *af, char *name)
845{
846 int i;
847
848 if (!name)
849 return NULL;
850 /* TODO: use index_in_str_array() */
851 for (i = 0; i < af->n_methods; i++) {
852 if (strcmp(af->method[i].name, name) == 0) {
853 return &af->method[i];
854 }
855 }
856 return NULL;
857}
858
859static struct interfaces_file_t *read_interfaces(const char *filename, struct interfaces_file_t *defn)
860{
861 /* Let's try to be compatible.
862 *
863 * "man 5 interfaces" says:
864 * Lines starting with "#" are ignored. Note that end-of-line
865 * comments are NOT supported, comments must be on a line of their own.
866 * A line may be extended across multiple lines by making
867 * the last character a backslash.
868 *
869 * Seen elsewhere in example config file:
870 * A first non-blank "#" character makes the rest of the line
871 * be ignored. Blank lines are ignored. Lines may be indented freely.
872 * A "\" character at the very end of the line indicates the next line
873 * should be treated as a continuation of the current one.
874 *
875 * Lines beginning with "source" are used to include stanzas from
876 * other files, so configuration can be split into many files.
877 * The word "source" is followed by the path of file to be sourced.
878 */
879#if ENABLE_FEATURE_IFUPDOWN_MAPPING
880 struct mapping_defn_t *currmap = NULL;
881#endif
882 struct interface_defn_t *currif = NULL;
883 FILE *f;
884 char *buf;
885 char *first_word;
886 char *rest_of_line;
887 enum { NONE, IFACE, MAPPING } currently_processing = NONE;
888
889 if (!defn)
890 defn = xzalloc(sizeof(*defn));
891
892 debug_noise("reading %s file:\n", filename);
893 f = xfopen_for_read(filename);
894
895 while ((buf = xmalloc_fgetline(f)) != NULL) {
896#if ENABLE_DESKTOP
897 /* Trailing "\" concatenates lines */
898 char *p;
899 while ((p = last_char_is(buf, '\\')) != NULL) {
900 *p = '\0';
901 rest_of_line = xmalloc_fgetline(f);
902 if (!rest_of_line)
903 break;
904 p = xasprintf("%s%s", buf, rest_of_line);
905 free(buf);
906 free(rest_of_line);
907 buf = p;
908 }
909#endif
910 rest_of_line = buf;
911 first_word = next_word(&rest_of_line);
912 if (!first_word || *first_word == '#') {
913 free(buf);
914 continue; /* blank/comment line */
915 }
916
917 if (strcmp(first_word, "mapping") == 0) {
918#if ENABLE_FEATURE_IFUPDOWN_MAPPING
919 currmap = xzalloc(sizeof(*currmap));
920
921 while ((first_word = next_word(&rest_of_line)) != NULL) {
922 currmap->match = xrealloc_vector(currmap->match, 4, currmap->n_matches);
923 currmap->match[currmap->n_matches++] = xstrdup(first_word);
924 }
925 /*currmap->n_mappings = 0;*/
926 /*currmap->mapping = NULL;*/
927 /*currmap->script = NULL;*/
928 {
929 struct mapping_defn_t **where = &defn->mappings;
930 while (*where != NULL) {
931 where = &(*where)->next;
932 }
933 *where = currmap;
934 /*currmap->next = NULL;*/
935 }
936 debug_noise("Added mapping\n");
937#endif
938 currently_processing = MAPPING;
939 } else if (strcmp(first_word, "iface") == 0) {
940 static const struct address_family_t *const addr_fams[] = {
941#if ENABLE_FEATURE_IFUPDOWN_IPV4
942 &addr_inet,
943#endif
944#if ENABLE_FEATURE_IFUPDOWN_IPV6
945 &addr_inet6,
946#endif
947 &addr_link,
948 NULL
949 };
950 char *iface_name;
951 char *address_family_name;
952 char *method_name;
953
954 currif = xzalloc(sizeof(*currif));
955 iface_name = next_word(&rest_of_line);
956 address_family_name = next_word(&rest_of_line);
957 method_name = next_word(&rest_of_line);
958
959 if (method_name == NULL)
960 bb_error_msg_and_die("too few parameters for line \"%s\"", buf);
961
962 /* ship any trailing whitespace */
963 rest_of_line = skip_whitespace(rest_of_line);
964
965 if (rest_of_line[0] != '\0' /* && rest_of_line[0] != '#' */)
966 bb_error_msg_and_die("too many parameters \"%s\"", buf);
967
968 currif->iface = xstrdup(iface_name);
969
970 currif->address_family = get_address_family(addr_fams, address_family_name);
971 if (!currif->address_family)
972 bb_error_msg_and_die("unknown address type \"%s\"", address_family_name);
973
974 currif->method = get_method(currif->address_family, method_name);
975 if (!currif->method)
976 bb_error_msg_and_die("unknown method \"%s\"", method_name);
977#if 0
978// Allegedly, Debian allows a duplicate definition:
979// iface eth0 inet static
980// address 192.168.0.15
981// netmask 255.255.0.0
982// gateway 192.168.0.1
983//
984// iface eth0 inet static
985// address 10.0.0.1
986// netmask 255.255.255.0
987//
988// This adds *two* addresses to eth0 (probably requires use of "ip", not "ifconfig"
989//
990 llist_t *iface_list;
991 for (iface_list = defn->ifaces; iface_list; iface_list = iface_list->link) {
992 struct interface_defn_t *tmp = (struct interface_defn_t *) iface_list->data;
993 if ((strcmp(tmp->iface, currif->iface) == 0)
994 && (tmp->address_family == currif->address_family)
995 ) {
996 bb_error_msg_and_die("duplicate interface \"%s\"", tmp->iface);
997 }
998 }
999#endif
1000 llist_add_to_end(&(defn->ifaces), (char*)currif);
1001
1002 debug_noise("iface %s %s %s\n", currif->iface, address_family_name, method_name);
1003 currently_processing = IFACE;
1004 } else if (strcmp(first_word, "auto") == 0) {
1005 while ((first_word = next_word(&rest_of_line)) != NULL) {
1006
1007 /* Check the interface isnt already listed */
1008 if (llist_find_str(defn->autointerfaces, first_word)) {
1009 bb_perror_msg_and_die("interface declared auto twice \"%s\"", buf);
1010 }
1011
1012 /* Add the interface to the list */
1013 llist_add_to_end(&(defn->autointerfaces), xstrdup(first_word));
1014 debug_noise("\nauto %s\n", first_word);
1015 }
1016 currently_processing = NONE;
1017 } else if (strcmp(first_word, "source") == 0) {
1018 read_interfaces(next_word(&rest_of_line), defn);
1019 } else {
1020 switch (currently_processing) {
1021 case IFACE:
1022 if (rest_of_line[0] == '\0')
1023 bb_error_msg_and_die("option with empty value \"%s\"", buf);
1024
1025 if (strcmp(first_word, "post-up") == 0)
1026 first_word += 5; /* "up" */
1027 else if (strcmp(first_word, "pre-down") == 0)
1028 first_word += 4; /* "down" */
1029
1030 /* If not one of "up", "down",... words... */
1031 if (index_in_strings(keywords_up_down, first_word) < 0) {
1032 int i;
1033 for (i = 0; i < currif->n_options; i++) {
1034 if (strcmp(currif->option[i].name, first_word) == 0)
1035 bb_error_msg_and_die("duplicate option \"%s\"", buf);
1036 }
1037 }
1038 debug_noise("\t%s=%s\n", first_word, rest_of_line);
1039 currif->option = xrealloc_vector(currif->option, 4, currif->n_options);
1040 currif->option[currif->n_options].name = xstrdup(first_word);
1041 currif->option[currif->n_options].value = xstrdup(rest_of_line);
1042 currif->n_options++;
1043 break;
1044 case MAPPING:
1045#if ENABLE_FEATURE_IFUPDOWN_MAPPING
1046 if (strcmp(first_word, "script") == 0) {
1047 if (currmap->script != NULL)
1048 bb_error_msg_and_die("duplicate script in mapping \"%s\"", buf);
1049 currmap->script = xstrdup(next_word(&rest_of_line));
1050 } else if (strcmp(first_word, "map") == 0) {
1051 currmap->mapping = xrealloc_vector(currmap->mapping, 2, currmap->n_mappings);
1052 currmap->mapping[currmap->n_mappings] = xstrdup(next_word(&rest_of_line));
1053 currmap->n_mappings++;
1054 } else {
1055 bb_error_msg_and_die("misplaced option \"%s\"", buf);
1056 }
1057#endif
1058 break;
1059 case NONE:
1060 default:
1061 bb_error_msg_and_die("misplaced option \"%s\"", buf);
1062 }
1063 }
1064 free(buf);
1065 } /* while (fgets) */
1066
1067 if (ferror(f) != 0) {
1068 /* ferror does NOT set errno! */
1069 bb_error_msg_and_die("%s: I/O error", filename);
1070 }
1071 fclose(f);
1072 debug_noise("\ndone reading %s\n\n", filename);
1073
1074 return defn;
1075}
1076
1077static char *setlocalenv(const char *format, const char *name, const char *value)
1078{
1079 char *result;
1080 char *dst;
1081 char *src;
1082 char c;
1083
1084 result = xasprintf(format, name, value);
1085
1086 for (dst = src = result; (c = *src) != '=' && c; src++) {
1087 if (c == '-')
1088 c = '_';
1089 if (c >= 'a' && c <= 'z')
1090 c -= ('a' - 'A');
1091 if (isalnum(c) || c == '_')
1092 *dst++ = c;
1093 }
1094 overlapping_strcpy(dst, src);
1095
1096 return result;
1097}
1098
1099static void set_environ(struct interface_defn_t *iface, const char *mode, const char *opt)
1100{
1101 int i;
1102 char **pp;
1103
1104 if (G.my_environ != NULL) {
1105 for (pp = G.my_environ; *pp; pp++) {
1106 free(*pp);
1107 }
1108 free(G.my_environ);
1109 }
1110
1111 /* note: last element will stay NULL: */
1112 G.my_environ = xzalloc(sizeof(char *) * (iface->n_options + 7));
1113 pp = G.my_environ;
1114
1115 for (i = 0; i < iface->n_options; i++) {
1116 if (index_in_strings(keywords_up_down, iface->option[i].name) >= 0) {
1117 continue;
1118 }
1119 *pp++ = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value);
1120 }
1121
1122 *pp++ = setlocalenv("%s=%s", "IFACE", iface->iface);
1123 *pp++ = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name);
1124 *pp++ = setlocalenv("%s=%s", "METHOD", iface->method->name);
1125 *pp++ = setlocalenv("%s=%s", "MODE", mode);
1126 *pp++ = setlocalenv("%s=%s", "PHASE", opt);
1127 if (G.startup_PATH)
1128 *pp++ = setlocalenv("%s=%s", "PATH", G.startup_PATH);
1129}
1130
1131static int doit(char *str)
1132{
1133 if (option_mask32 & (OPT_no_act|OPT_verbose)) {
1134 puts(str);
1135 }
1136 if (!(option_mask32 & OPT_no_act)) {
1137 pid_t child;
1138 int status;
1139
1140 fflush_all();
1141 child = vfork();
1142 if (child < 0) /* failure */
1143 return 0;
1144 if (child == 0) { /* child */
1145 execle(G.shell, G.shell, "-c", str, (char *) NULL, G.my_environ);
1146 _exit(127);
1147 }
1148 safe_waitpid(child, &status, 0);
1149 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
1150 return 0;
1151 }
1152 }
1153 return 1;
1154}
1155
1156static int execute_all(struct interface_defn_t *ifd, const char *opt)
1157{
1158 int i;
1159 char *buf;
1160 for (i = 0; i < ifd->n_options; i++) {
1161 if (strcmp(ifd->option[i].name, opt) == 0) {
1162 if (!doit(ifd->option[i].value)) {
1163 return 0;
1164 }
1165 }
1166 }
1167
1168 /* Tested on Debian Squeeze: "standard" ifup runs this without
1169 * checking that directory exists. If it doesn't, run-parts
1170 * complains, and this message _is_ annoyingly visible.
1171 * Don't "fix" this (unless newer Debian does).
1172 */
1173 buf = xasprintf("run-parts /etc/network/if-%s.d", opt);
1174 /* heh, we don't bother free'ing it */
1175 return doit(buf);
1176}
1177
1178static int check(char *str)
1179{
1180 return str != NULL;
1181}
1182
1183static int iface_up(struct interface_defn_t *iface)
1184{
1185 if (!iface->method->up(iface, check)) return -1;
1186 set_environ(iface, "start", "pre-up");
1187 if (!execute_all(iface, "pre-up")) return 0;
1188 if (!iface->method->up(iface, doit)) return 0;
1189 set_environ(iface, "start", "post-up");
1190 if (!execute_all(iface, "up")) return 0;
1191 return 1;
1192}
1193
1194static int iface_down(struct interface_defn_t *iface)
1195{
1196 if (!iface->method->down(iface, check)) return -1;
1197 set_environ(iface, "stop", "pre-down");
1198 if (!execute_all(iface, "down")) return 0;
1199 if (!iface->method->down(iface, doit)) return 0;
1200 set_environ(iface, "stop", "post-down");
1201 if (!execute_all(iface, "post-down")) return 0;
1202 return 1;
1203}
1204
1205#if ENABLE_FEATURE_IFUPDOWN_MAPPING
1206static int popen2(FILE **in, FILE **out, char *command, char *param)
1207{
1208 char *argv[3] = { command, param, NULL };
1209 struct fd_pair infd, outfd;
1210 pid_t pid;
1211
1212 xpiped_pair(infd);
1213 xpiped_pair(outfd);
1214
1215 fflush_all();
1216 pid = xvfork();
1217
1218 if (pid == 0) {
1219 /* Child */
1220 /* NB: close _first_, then move fds! */
1221 close(infd.wr);
1222 close(outfd.rd);
1223 xmove_fd(infd.rd, 0);
1224 xmove_fd(outfd.wr, 1);
1225 BB_EXECVP_or_die(argv);
1226 }
1227 /* parent */
1228 close(infd.rd);
1229 close(outfd.wr);
1230 *in = xfdopen_for_write(infd.wr);
1231 *out = xfdopen_for_read(outfd.rd);
1232 return pid;
1233}
1234
1235static char *run_mapping(char *physical, struct mapping_defn_t *map)
1236{
1237 FILE *in, *out;
1238 int i, status;
1239 pid_t pid;
1240
1241 char *logical = xstrdup(physical);
1242
1243 /* Run the mapping script. Never fails. */
1244 pid = popen2(&in, &out, map->script, physical);
1245
1246 /* Write mappings to stdin of mapping script. */
1247 for (i = 0; i < map->n_mappings; i++) {
1248 fprintf(in, "%s\n", map->mapping[i]);
1249 }
1250 fclose(in);
1251 safe_waitpid(pid, &status, 0);
1252
1253 if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
1254 /* If the mapping script exited successfully, try to
1255 * grab a line of output and use that as the name of the
1256 * logical interface. */
1257 char *new_logical = xmalloc_fgetline(out);
1258
1259 if (new_logical) {
1260 /* If we are able to read a line of output from the script,
1261 * remove any trailing whitespace and use this value
1262 * as the name of the logical interface. */
1263 char *pch = new_logical + strlen(new_logical) - 1;
1264
1265 while (pch >= new_logical && isspace(*pch))
1266 *(pch--) = '\0';
1267
1268 free(logical);
1269 logical = new_logical;
1270 }
1271 }
1272
1273 fclose(out);
1274
1275 return logical;
1276}
1277#endif /* FEATURE_IFUPDOWN_MAPPING */
1278
1279static llist_t *find_iface_state(llist_t *state_list, const char *iface)
1280{
1281 llist_t *search = state_list;
1282
1283 while (search) {
1284 char *after_iface = is_prefixed_with(search->data, iface);
1285 if (after_iface
1286 && *after_iface == '='
1287 ) {
1288 return search;
1289 }
1290 search = search->link;
1291 }
1292 return NULL;
1293}
1294
1295/* read the previous state from the state file */
1296static llist_t *read_iface_state(void)
1297{
1298 llist_t *state_list = NULL;
1299 FILE *state_fp = fopen_for_read(IFSTATE_FILE_PATH);
1300
1301 if (state_fp) {
1302 char *start, *end_ptr;
1303 while ((start = xmalloc_fgets(state_fp)) != NULL) {
1304 /* We should only need to check for a single character */
1305 end_ptr = start + strcspn(start, " \t\n");
1306 *end_ptr = '\0';
1307 llist_add_to(&state_list, start);
1308 }
1309 fclose(state_fp);
1310 }
1311 return state_list;
1312}
1313
1314/* read the previous state from the state file */
1315static FILE *open_new_state_file(void)
1316{
1317 int fd, flags, cnt;
1318
1319 cnt = 0;
1320 flags = (O_WRONLY | O_CREAT | O_EXCL);
1321 for (;;) {
1322 fd = open(IFSTATE_FILE_PATH".new", flags, 0666);
1323 if (fd >= 0)
1324 break;
1325 if (errno != EEXIST
1326 || flags == (O_WRONLY | O_CREAT | O_TRUNC)
1327 ) {
1328 bb_perror_msg_and_die("can't open '%s'",
1329 IFSTATE_FILE_PATH".new");
1330 }
1331 /* Someone else created the .new file */
1332 if (cnt > 30 * 1000) {
1333 /* Waited for 30*30/2 = 450 milliseconds, still EEXIST.
1334 * Assuming a stale file, rewriting it.
1335 */
1336 flags = (O_WRONLY | O_CREAT | O_TRUNC);
1337 continue;
1338 }
1339 usleep(cnt);
1340 cnt += 1000;
1341 }
1342
1343 return xfdopen_for_write(fd);
1344}
1345
1346int ifupdown_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1347int ifupdown_main(int argc UNUSED_PARAM, char **argv)
1348{
1349 int (*cmds)(struct interface_defn_t *);
1350 struct interfaces_file_t *defn;
1351 llist_t *target_list = NULL;
1352 const char *interfaces = "/etc/network/interfaces";
1353 bool any_failures = 0;
1354
1355 INIT_G();
1356
1357 G.startup_PATH = getenv("PATH");
1358 G.shell = xstrdup(get_shell_name());
1359
1360 if (ENABLE_IFUP
1361 && (!ENABLE_IFDOWN || applet_name[2] == 'u')
1362 ) {
1363 /* ifup command */
1364 cmds = iface_up;
1365 } else {
1366 cmds = iface_down;
1367 }
1368
1369 getopt32(argv, OPTION_STR, &interfaces);
1370 argv += optind;
1371 if (argv[0]) {
1372 if (DO_ALL) bb_show_usage();
1373 } else {
1374 if (!DO_ALL) bb_show_usage();
1375 }
1376
1377 defn = read_interfaces(interfaces, NULL);
1378
1379 /* Create a list of interfaces to work on */
1380 if (DO_ALL) {
1381 target_list = defn->autointerfaces;
1382 } else {
1383 llist_add_to_end(&target_list, argv[0]);
1384 }
1385
1386 /* Update the interfaces */
1387 while (target_list) {
1388 llist_t *iface_list;
1389 struct interface_defn_t *currif;
1390 char *iface;
1391 char *liface;
1392 char *pch;
1393 bool okay = 0;
1394 int cmds_ret;
1395 bool curr_failure = 0;
1396
1397 iface = xstrdup(target_list->data);
1398 target_list = target_list->link;
1399
1400 pch = strchr(iface, '=');
1401 if (pch) {
1402 *pch = '\0';
1403 liface = xstrdup(pch + 1);
1404 } else {
1405 liface = xstrdup(iface);
1406 }
1407
1408 if (!FORCE) {
1409 llist_t *state_list = read_iface_state();
1410 const llist_t *iface_state = find_iface_state(state_list, iface);
1411
1412 if (cmds == iface_up) {
1413 /* ifup */
1414 if (iface_state) {
1415 bb_error_msg("interface %s already configured", iface);
1416 goto next;
1417 }
1418 } else {
1419 /* ifdown */
1420 if (!iface_state) {
1421 bb_error_msg("interface %s not configured", iface);
1422 goto next;
1423 }
1424 }
1425 llist_free(state_list, free);
1426 }
1427
1428#if ENABLE_FEATURE_IFUPDOWN_MAPPING
1429 if ((cmds == iface_up) && !NO_MAPPINGS) {
1430 struct mapping_defn_t *currmap;
1431
1432 for (currmap = defn->mappings; currmap; currmap = currmap->next) {
1433 int i;
1434 for (i = 0; i < currmap->n_matches; i++) {
1435 if (fnmatch(currmap->match[i], liface, 0) != 0)
1436 continue;
1437 if (VERBOSE) {
1438 printf("Running mapping script %s on %s\n", currmap->script, liface);
1439 }
1440 liface = run_mapping(iface, currmap);
1441 break;
1442 }
1443 }
1444 }
1445#endif
1446
1447 iface_list = defn->ifaces;
1448 while (iface_list) {
1449 currif = (struct interface_defn_t *) iface_list->data;
1450 if (strcmp(liface, currif->iface) == 0) {
1451 char *oldiface = currif->iface;
1452
1453 okay = 1;
1454 currif->iface = iface;
1455
1456 debug_noise("\nConfiguring interface %s (%s)\n", liface, currif->address_family->name);
1457
1458 /* Call the cmds function pointer, does either iface_up() or iface_down() */
1459 cmds_ret = cmds(currif);
1460 if (cmds_ret == -1) {
1461 bb_error_msg("don't have all variables for %s/%s",
1462 liface, currif->address_family->name);
1463 any_failures = curr_failure = 1;
1464 } else if (cmds_ret == 0) {
1465 any_failures = curr_failure = 1;
1466 }
1467
1468 currif->iface = oldiface;
1469 }
1470 iface_list = iface_list->link;
1471 }
1472 if (VERBOSE) {
1473 bb_putchar('\n');
1474 }
1475
1476 if (!okay && !FORCE) {
1477 bb_error_msg("ignoring unknown interface %s", liface);
1478 any_failures = 1;
1479 } else if (!NO_ACT) {
1480 /* update the state file */
1481 FILE *new_state_fp = open_new_state_file();
1482 llist_t *state;
1483 llist_t *state_list = read_iface_state();
1484 llist_t *iface_state = find_iface_state(state_list, iface);
1485
1486 if (cmds == iface_up && !curr_failure) {
1487 char *newiface = xasprintf("%s=%s", iface, liface);
1488 if (!iface_state) {
1489 llist_add_to_end(&state_list, newiface);
1490 } else {
1491 free(iface_state->data);
1492 iface_state->data = newiface;
1493 }
1494 } else {
1495 /* Remove an interface from state_list */
1496 llist_unlink(&state_list, iface_state);
1497 free(llist_pop(&iface_state));
1498 }
1499
1500 /* Actually write the new state */
1501 state = state_list;
1502 while (state) {
1503 if (state->data) {
1504 fprintf(new_state_fp, "%s\n", state->data);
1505 }
1506 state = state->link;
1507 }
1508 fclose(new_state_fp);
1509 xrename(IFSTATE_FILE_PATH".new", IFSTATE_FILE_PATH);
1510 llist_free(state_list, free);
1511 }
1512 next:
1513 free(iface);
1514 free(liface);
1515 }
1516
1517 return any_failures;
1518}
1519
generated by cgit at 2024-05-14 03:28:22 (GMT)