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path: root/networking/ifupdown.c (plain)
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1/* vi: set sw=4 ts=4: */
2/*
3 * ifupdown 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//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"
29//usage: )
30//usage: "\n -v Print out what would happen before doing it"
31//usage: "\n -f Force de/configuration"
32//usage:
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"
42//usage: )
43//usage: "\n -v Print out what would happen before doing it"
44//usage: "\n -f Force de/configuration"
45
46#include "libbb.h"
47/* After libbb.h, since it needs sys/types.h on some systems */
48#include <sys/utsname.h>
49#include <fnmatch.h>
50
51#define MAX_OPT_DEPTH 10
52
53#if ENABLE_FEATURE_IFUPDOWN_MAPPING
54#define MAX_INTERFACE_LENGTH 10
55#endif
56
57#define UDHCPC_CMD_OPTIONS CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS
58
59#define debug_noise(args...) /*fprintf(stderr, args)*/
60
61/* Forward declaration */
62struct interface_defn_t;
63
64typedef int execfn(char *command);
65
66struct method_t {
67 const char *name;
68 int (*up)(struct interface_defn_t *ifd, execfn *e) FAST_FUNC;
69 int (*down)(struct interface_defn_t *ifd, execfn *e) FAST_FUNC;
70};
71
72struct address_family_t {
73 const char *name;
74 int n_methods;
75 const struct method_t *method;
76};
77
78struct mapping_defn_t {
79 struct mapping_defn_t *next;
80
81 int max_matches;
82 int n_matches;
83 char **match;
84
85 char *script;
86
87 int n_mappings;
88 char **mapping;
89};
90
91struct variable_t {
92 char *name;
93 char *value;
94};
95
96struct interface_defn_t {
97 const struct address_family_t *address_family;
98 const struct method_t *method;
99
100 char *iface;
101 int n_options;
102 struct variable_t *option;
103};
104
105struct interfaces_file_t {
106 llist_t *autointerfaces;
107 llist_t *ifaces;
108 struct mapping_defn_t *mappings;
109};
110
111
112#define OPTION_STR "anvf" IF_FEATURE_IFUPDOWN_MAPPING("m") "i:"
113enum {
114 OPT_do_all = 0x1,
115 OPT_no_act = 0x2,
116 OPT_verbose = 0x4,
117 OPT_force = 0x8,
118 OPT_no_mappings = 0x10,
119};
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)
125
126
127struct globals {
128 char **my_environ;
129 const char *startup_PATH;
130 char *shell;
131} FIX_ALIASING;
132#define G (*(struct globals*)&bb_common_bufsiz1)
133#define INIT_G() do { } while (0)
134
135
136static const char keywords_up_down[] ALIGN1 =
137 "up\0"
138 "down\0"
139 "pre-up\0"
140 "post-down\0"
141;
142
143
144#if ENABLE_FEATURE_IFUPDOWN_IPV4 || ENABLE_FEATURE_IFUPDOWN_IPV6
145
146static void addstr(char **bufp, const char *str, size_t str_length)
147{
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! */
151 char *buf = *bufp;
152 int len = (buf ? strlen(buf) : 0);
153 str_length++;
154 buf = xrealloc(buf, len + str_length);
155 /* copies at most str_length-1 chars! */
156 safe_strncpy(buf + len, str, str_length);
157 *bufp = buf;
158}
159
160static int strncmpz(const char *l, const char *r, size_t llen)
161{
162 int i = strncmp(l, r, llen);
163
164 if (i == 0)
165 return - (unsigned char)r[llen];
166 return i;
167}
168
169static char *get_var(const char *id, size_t idlen, struct interface_defn_t *ifd)
170{
171 int i;
172
173 if (strncmpz(id, "iface", idlen) == 0) {
174 // ubuntu's ifup doesn't do this:
175 //static char *label_buf;
176 //char *result;
177 //free(label_buf);
178 //label_buf = xstrdup(ifd->iface);
179 // Remove virtual iface suffix
180 //result = strchrnul(label_buf, ':');
181 //*result = '\0';
182 //return label_buf;
183
184 return ifd->iface;
185 }
186 if (strncmpz(id, "label", idlen) == 0) {
187 return ifd->iface;
188 }
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;
192 }
193 }
194 return NULL;
195}
196
197# if ENABLE_FEATURE_IFUPDOWN_IP
198static int count_netmask_bits(const char *dotted_quad)
199{
200// int result;
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)
204// return -1;
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 */
209
210 /* Shorter version */
211 int result;
212 struct in_addr ip;
213 unsigned d;
214
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 */
221 result = 32;
222 while (d) {
223 d >>= 1;
224 result--;
225 }
226 return result;
227}
228# endif
229
230static char *parse(const char *command, struct interface_defn_t *ifd)
231{
232 size_t old_pos[MAX_OPT_DEPTH] = { 0 };
233 smallint okay[MAX_OPT_DEPTH] = { 1 };
234 int opt_depth = 1;
235 char *result = NULL;
236
237 while (*command) {
238 switch (*command) {
239 default:
240 addstr(&result, command, 1);
241 command++;
242 break;
243 case '\\':
244 if (command[1])
245 command++;
246 addstr(&result, command, 1);
247 command++;
248 break;
249 case '[':
250 if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) {
251 old_pos[opt_depth] = result ? strlen(result) : 0;
252 okay[opt_depth] = 1;
253 opt_depth++;
254 command += 2;
255 } else {
256 addstr(&result, command, 1);
257 command++;
258 }
259 break;
260 case ']':
261 if (command[1] == ']' && opt_depth > 1) {
262 opt_depth--;
263 if (!okay[opt_depth]) {
264 result[old_pos[opt_depth]] = '\0';
265 }
266 command += 2;
267 } else {
268 addstr(&result, command, 1);
269 command++;
270 }
271 break;
272 case '%':
273 {
274 char *nextpercent;
275 char *varvalue;
276
277 command++;
278 nextpercent = strchr(command, '%');
279 if (!nextpercent) {
280 /* Unterminated %var% */
281 free(result);
282 return NULL;
283 }
284
285 varvalue = get_var(command, nextpercent - command, ifd);
286
287 if (varvalue) {
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));
294 }
295# endif
296 addstr(&result, varvalue, strlen(varvalue));
297 } else {
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) {
302 unsigned res;
303 varvalue = get_var("netmask", 7, ifd);
304 if (varvalue) {
305 res = count_netmask_bits(varvalue);
306 if (res > 0) {
307 const char *argument = utoa(res);
308 addstr(&result, argument, strlen(argument));
309 command = nextpercent + 1;
310 break;
311 }
312 }
313 }
314# endif
315 okay[opt_depth - 1] = 0;
316 }
317
318 command = nextpercent + 1;
319 }
320 break;
321 }
322 }
323
324 if (opt_depth > 1) {
325 /* Unbalanced bracket */
326 free(result);
327 return NULL;
328 }
329
330 if (!okay[0]) {
331 /* Undefined variable and we aren't in a bracket */
332 free(result);
333 return NULL;
334 }
335
336 return result;
337}
338
339/* execute() returns 1 for success and 0 for failure */
340static int execute(const char *command, struct interface_defn_t *ifd, execfn *exec)
341{
342 char *out;
343 int ret;
344
345 out = parse(command, ifd);
346 if (!out) {
347 /* parse error? */
348 return 0;
349 }
350 /* out == "": parsed ok but not all needed variables known, skip */
351 ret = out[0] ? (*exec)(out) : 1;
352
353 free(out);
354 if (ret != 1) {
355 return 0;
356 }
357 return 1;
358}
359
360#endif /* FEATURE_IFUPDOWN_IPV4 || FEATURE_IFUPDOWN_IPV6 */
361
362
363#if ENABLE_FEATURE_IFUPDOWN_IPV6
364
365static int FAST_FUNC loopback_up6(struct interface_defn_t *ifd, execfn *exec)
366{
367# if ENABLE_FEATURE_IFUPDOWN_IP
368 int result;
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);
372# else
373 return execute("ifconfig %iface% add ::1", ifd, exec);
374# endif
375}
376
377static int FAST_FUNC loopback_down6(struct interface_defn_t *ifd, execfn *exec)
378{
379# if ENABLE_FEATURE_IFUPDOWN_IP
380 return execute("ip link set %iface% down", ifd, exec);
381# else
382 return execute("ifconfig %iface% del ::1", ifd, exec);
383# endif
384}
385
386static int FAST_FUNC manual_up_down6(struct interface_defn_t *ifd UNUSED_PARAM, execfn *exec UNUSED_PARAM)
387{
388 return 1;
389}
390
391static int FAST_FUNC static_up6(struct interface_defn_t *ifd, execfn *exec)
392{
393 int result;
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);
399# else
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);
403# endif
404 return ((result == 3) ? 3 : 0);
405}
406
407static int FAST_FUNC static_down6(struct interface_defn_t *ifd, execfn *exec)
408{
409# if ENABLE_FEATURE_IFUPDOWN_IP
410 return execute("ip link set %iface% down", ifd, exec);
411# else
412 return execute("ifconfig %iface% down", ifd, exec);
413# endif
414}
415
416# if ENABLE_FEATURE_IFUPDOWN_IP
417static int FAST_FUNC v4tunnel_up(struct interface_defn_t *ifd, execfn *exec)
418{
419 int result;
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);
426}
427
428static int FAST_FUNC v4tunnel_down(struct interface_defn_t * ifd, execfn * exec)
429{
430 return execute("ip tunnel del %iface%", ifd, exec);
431}
432# endif
433
434static const struct method_t methods6[] = {
435# if ENABLE_FEATURE_IFUPDOWN_IP
436 { "v4tunnel" , v4tunnel_up , v4tunnel_down , },
437# endif
438 { "static" , static_up6 , static_down6 , },
439 { "manual" , manual_up_down6 , manual_up_down6 , },
440 { "loopback" , loopback_up6 , loopback_down6 , },
441};
442
443static const struct address_family_t addr_inet6 = {
444 "inet6",
445 ARRAY_SIZE(methods6),
446 methods6
447};
448
449#endif /* FEATURE_IFUPDOWN_IPV6 */
450
451
452#if ENABLE_FEATURE_IFUPDOWN_IPV4
453
454static int FAST_FUNC loopback_up(struct interface_defn_t *ifd, execfn *exec)
455{
456# if ENABLE_FEATURE_IFUPDOWN_IP
457 int result;
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);
461# else
462 return execute("ifconfig %iface% 127.0.0.1 up", ifd, exec);
463# endif
464}
465
466static int FAST_FUNC loopback_down(struct interface_defn_t *ifd, execfn *exec)
467{
468# if ENABLE_FEATURE_IFUPDOWN_IP
469 int result;
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);
473# else
474 return execute("ifconfig %iface% 127.0.0.1 down", ifd, exec);
475# endif
476}
477
478static int FAST_FUNC static_up(struct interface_defn_t *ifd, execfn *exec)
479{
480 int result;
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);
487# else
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",
491 ifd, exec);
492 result += execute("ifconfig %iface% %address% netmask %netmask%"
493 "[[ broadcast %broadcast%]][[ pointopoint %pointopoint%]] ",
494 ifd, exec);
495 result += execute("[[route add default gw %gateway%[[ metric %metric%]] %iface%]]", ifd, exec);
496 return ((result == 3) ? 3 : 0);
497# endif
498}
499
500static int FAST_FUNC static_down(struct interface_defn_t *ifd, execfn *exec)
501{
502 int result;
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);
506# else
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 */
510 result = 1;
511 result += execute("ifconfig %iface% down", ifd, exec);
512# endif
513 return ((result == 2) ? 2 : 0);
514}
515
516# if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
517struct dhcp_client_t {
518 const char *name;
519 const char *startcmd;
520 const char *stopcmd;
521};
522
523static const struct dhcp_client_t ext_dhcp_clients[] = {
524 { "dhcpcd",
525 "dhcpcd[[ -h %hostname%]][[ -i %vendor%]][[ -I %client%]][[ -l %leasetime%]] %iface%",
526 "dhcpcd -k %iface%",
527 },
528 { "dhclient",
529 "dhclient -pf /var/run/dhclient.%iface%.pid %iface%",
530 "kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null",
531 },
532 { "pump",
533 "pump -i %iface%[[ -h %hostname%]][[ -l %leasehours%]]",
534 "pump -i %iface% -k",
535 },
536 { "udhcpc",
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",
540 },
541};
542# endif /* FEATURE_IFUPDOWN_EXTERNAL_DHCPC */
543
544# if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
545static int FAST_FUNC dhcp_up(struct interface_defn_t *ifd, execfn *exec)
546{
547 unsigned i;
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))
551 return 0;
552# else
553 /* needed if we have hwaddress on dhcp iface */
554 if (!execute("ifconfig %iface%[[ hw %hwaddress%]] up", ifd, exec))
555 return 0;
556# endif
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);
560 }
561 bb_error_msg("no dhcp clients found");
562 return 0;
563}
564# elif ENABLE_UDHCPC
565static int FAST_FUNC dhcp_up(struct interface_defn_t *ifd, execfn *exec)
566{
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))
570 return 0;
571# else
572 /* needed if we have hwaddress on dhcp iface */
573 if (!execute("ifconfig %iface%[[ hw %hwaddress%]] up", ifd, exec))
574 return 0;
575# endif
576 return execute("udhcpc " UDHCPC_CMD_OPTIONS " -p /var/run/udhcpc.%iface%.pid "
577 "-i %iface%[[ -H %hostname%]][[ -c %client%]][[ -s %script%]][[ %udhcpc_opts%]]",
578 ifd, exec);
579}
580# else
581static int FAST_FUNC dhcp_up(struct interface_defn_t *ifd UNUSED_PARAM,
582 execfn *exec UNUSED_PARAM)
583{
584 return 0; /* no dhcp support */
585}
586# endif
587
588# if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
589static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd, execfn *exec)
590{
591 int result = 0;
592 unsigned i;
593
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);
597 if (result)
598 break;
599 }
600 }
601
602 if (!result)
603 bb_error_msg("warning: no dhcp clients found and stopped");
604
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 */
607 usleep(100000);
608 result += static_down(ifd, exec);
609 return ((result == 3) ? 3 : 0);
610}
611# elif ENABLE_UDHCPC
612static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd, execfn *exec)
613{
614 int result;
615 result = execute(
616 "test -f /var/run/udhcpc.%iface%.pid && "
617 "kill `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
618 ifd, exec);
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 */
624 usleep(100000);
625 result += static_down(ifd, exec);
626 return ((result == 3) ? 3 : 0);
627}
628# else
629static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd UNUSED_PARAM,
630 execfn *exec UNUSED_PARAM)
631{
632 return 0; /* no dhcp support */
633}
634# endif
635
636static int FAST_FUNC manual_up_down(struct interface_defn_t *ifd UNUSED_PARAM, execfn *exec UNUSED_PARAM)
637{
638 return 1;
639}
640
641static int FAST_FUNC bootp_up(struct interface_defn_t *ifd, execfn *exec)
642{
643 return execute("bootpc[[ --bootfile %bootfile%]] --dev %iface%"
644 "[[ --server %server%]][[ --hwaddr %hwaddr%]]"
645 " --returniffail --serverbcast", ifd, exec);
646}
647
648static int FAST_FUNC ppp_up(struct interface_defn_t *ifd, execfn *exec)
649{
650 return execute("pon[[ %provider%]]", ifd, exec);
651}
652
653static int FAST_FUNC ppp_down(struct interface_defn_t *ifd, execfn *exec)
654{
655 return execute("poff[[ %provider%]]", ifd, exec);
656}
657
658static int FAST_FUNC wvdial_up(struct interface_defn_t *ifd, execfn *exec)
659{
660 return execute("start-stop-daemon --start -x wvdial "
661 "-p /var/run/wvdial.%iface% -b -m --[[ %provider%]]", ifd, exec);
662}
663
664static int FAST_FUNC wvdial_down(struct interface_defn_t *ifd, execfn *exec)
665{
666 return execute("start-stop-daemon --stop -x wvdial "
667 "-p /var/run/wvdial.%iface% -s 2", ifd, exec);
668}
669
670static 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 , },
678};
679
680static const struct address_family_t addr_inet = {
681 "inet",
682 ARRAY_SIZE(methods),
683 methods
684};
685
686#endif /* FEATURE_IFUPDOWN_IPV4 */
687
688
689/* Returns pointer to the next word, or NULL.
690 * In 1st case, advances *buf to the word after this one.
691 */
692static char *next_word(char **buf)
693{
694 unsigned length;
695 char *word;
696
697 /* Skip over leading whitespace */
698 word = skip_whitespace(*buf);
699
700 /* Stop on EOL */
701 if (*word == '\0')
702 return NULL;
703
704 /* Find the length of this word (can't be 0) */
705 length = strcspn(word, " \t\n");
706
707 /* Unless we are already at NUL, store NUL and advance */
708 if (word[length] != '\0')
709 word[length++] = '\0';
710
711 *buf = skip_whitespace(word + length);
712
713 return word;
714}
715
716static const struct address_family_t *get_address_family(const struct address_family_t *const af[], char *name)
717{
718 int i;
719
720 if (!name)
721 return NULL;
722
723 for (i = 0; af[i]; i++) {
724 if (strcmp(af[i]->name, name) == 0) {
725 return af[i];
726 }
727 }
728 return NULL;
729}
730
731static const struct method_t *get_method(const struct address_family_t *af, char *name)
732{
733 int i;
734
735 if (!name)
736 return NULL;
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];
741 }
742 }
743 return NULL;
744}
745
746static struct interfaces_file_t *read_interfaces(const char *filename, struct interfaces_file_t *defn)
747{
748 /* Let's try to be compatible.
749 *
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.
755 *
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.
761 *
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.
765 */
766#if ENABLE_FEATURE_IFUPDOWN_MAPPING
767 struct mapping_defn_t *currmap = NULL;
768#endif
769 struct interface_defn_t *currif = NULL;
770 FILE *f;
771 char *buf;
772 char *first_word;
773 char *rest_of_line;
774 enum { NONE, IFACE, MAPPING } currently_processing = NONE;
775
776 if (!defn)
777 defn = xzalloc(sizeof(*defn));
778
779 debug_noise("reading %s file:\n", filename);
780 f = xfopen_for_read(filename);
781
782 while ((buf = xmalloc_fgetline(f)) != NULL) {
783#if ENABLE_DESKTOP
784 /* Trailing "\" concatenates lines */
785 char *p;
786 while ((p = last_char_is(buf, '\\')) != NULL) {
787 *p = '\0';
788 rest_of_line = xmalloc_fgetline(f);
789 if (!rest_of_line)
790 break;
791 p = xasprintf("%s%s", buf, rest_of_line);
792 free(buf);
793 free(rest_of_line);
794 buf = p;
795 }
796#endif
797 rest_of_line = buf;
798 first_word = next_word(&rest_of_line);
799 if (!first_word || *first_word == '#') {
800 free(buf);
801 continue; /* blank/comment line */
802 }
803
804 if (strcmp(first_word, "mapping") == 0) {
805#if ENABLE_FEATURE_IFUPDOWN_MAPPING
806 currmap = xzalloc(sizeof(*currmap));
807
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);
811 }
812 /*currmap->n_mappings = 0;*/
813 /*currmap->mapping = NULL;*/
814 /*currmap->script = NULL;*/
815 {
816 struct mapping_defn_t **where = &defn->mappings;
817 while (*where != NULL) {
818 where = &(*where)->next;
819 }
820 *where = currmap;
821 /*currmap->next = NULL;*/
822 }
823 debug_noise("Added mapping\n");
824#endif
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
829 &addr_inet,
830#endif
831#if ENABLE_FEATURE_IFUPDOWN_IPV6
832 &addr_inet6,
833#endif
834 NULL
835 };
836 char *iface_name;
837 char *address_family_name;
838 char *method_name;
839 llist_t *iface_list;
840
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);
845
846 if (method_name == NULL)
847 bb_error_msg_and_die("too few parameters for line \"%s\"", buf);
848
849 /* ship any trailing whitespace */
850 rest_of_line = skip_whitespace(rest_of_line);
851
852 if (rest_of_line[0] != '\0' /* && rest_of_line[0] != '#' */)
853 bb_error_msg_and_die("too many parameters \"%s\"", buf);
854
855 currif->iface = xstrdup(iface_name);
856
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);
860
861 currif->method = get_method(currif->address_family, method_name);
862 if (!currif->method)
863 bb_error_msg_and_die("unknown method \"%s\"", method_name);
864
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)
869 ) {
870 bb_error_msg_and_die("duplicate interface \"%s\"", tmp->iface);
871 }
872 }
873 llist_add_to_end(&(defn->ifaces), (char*)currif);
874
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) {
879
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);
883 }
884
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);
888 }
889 currently_processing = NONE;
890 } else if (strcmp(first_word, "source") == 0) {
891 read_interfaces(next_word(&rest_of_line), defn);
892 } else {
893 switch (currently_processing) {
894 case IFACE:
895 if (rest_of_line[0] == '\0')
896 bb_error_msg_and_die("option with empty value \"%s\"", buf);
897
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" */
902
903 /* If not one of "up", "down",... words... */
904 if (index_in_strings(keywords_up_down, first_word) < 0) {
905 int i;
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);
909 }
910 }
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);
915 currif->n_options++;
916 break;
917 case MAPPING:
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++;
927 } else {
928 bb_error_msg_and_die("misplaced option \"%s\"", buf);
929 }
930#endif
931 break;
932 case NONE:
933 default:
934 bb_error_msg_and_die("misplaced option \"%s\"", buf);
935 }
936 }
937 free(buf);
938 } /* while (fgets) */
939
940 if (ferror(f) != 0) {
941 /* ferror does NOT set errno! */
942 bb_error_msg_and_die("%s: I/O error", filename);
943 }
944 fclose(f);
945 debug_noise("\ndone reading %s\n\n", filename);
946
947 return defn;
948}
949
950static char *setlocalenv(const char *format, const char *name, const char *value)
951{
952 char *result;
953 char *dst;
954 char *src;
955 char c;
956
957 result = xasprintf(format, name, value);
958
959 for (dst = src = result; (c = *src) != '=' && c; src++) {
960 if (c == '-')
961 c = '_';
962 if (c >= 'a' && c <= 'z')
963 c -= ('a' - 'A');
964 if (isalnum(c) || c == '_')
965 *dst++ = c;
966 }
967 overlapping_strcpy(dst, src);
968
969 return result;
970}
971
972static void set_environ(struct interface_defn_t *iface, const char *mode, const char *opt)
973{
974 int i;
975 char **pp;
976
977 if (G.my_environ != NULL) {
978 for (pp = G.my_environ; *pp; pp++) {
979 free(*pp);
980 }
981 free(G.my_environ);
982 }
983
984 /* note: last element will stay NULL: */
985 G.my_environ = xzalloc(sizeof(char *) * (iface->n_options + 7));
986 pp = G.my_environ;
987
988 for (i = 0; i < iface->n_options; i++) {
989 if (index_in_strings(keywords_up_down, iface->option[i].name) >= 0) {
990 continue;
991 }
992 *pp++ = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value);
993 }
994
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);
1000 if (G.startup_PATH)
1001 *pp++ = setlocalenv("%s=%s", "PATH", G.startup_PATH);
1002}
1003
1004static int doit(char *str)
1005{
1006 if (option_mask32 & (OPT_no_act|OPT_verbose)) {
1007 puts(str);
1008 }
1009 if (!(option_mask32 & OPT_no_act)) {
1010 pid_t child;
1011 int status;
1012
1013 fflush_all();
1014 child = vfork();
1015 if (child < 0) /* failure */
1016 return 0;
1017 if (child == 0) { /* child */
1018 execle(G.shell, G.shell, "-c", str, (char *) NULL, G.my_environ);
1019 _exit(127);
1020 }
1021 safe_waitpid(child, &status, 0);
1022 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
1023 return 0;
1024 }
1025 }
1026 return 1;
1027}
1028
1029static int execute_all(struct interface_defn_t *ifd, const char *opt)
1030{
1031 int i;
1032 char *buf;
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)) {
1036 return 0;
1037 }
1038 }
1039 }
1040
1041 buf = xasprintf("run-parts /etc/network/if-%s.d", opt);
1042 /* heh, we don't bother free'ing it */
1043 return doit(buf);
1044}
1045
1046static int check(char *str)
1047{
1048 return str != NULL;
1049}
1050
1051static int iface_up(struct interface_defn_t *iface)
1052{
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;
1059 return 1;
1060}
1061
1062static int iface_down(struct interface_defn_t *iface)
1063{
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;
1070 return 1;
1071}
1072
1073#if ENABLE_FEATURE_IFUPDOWN_MAPPING
1074static int popen2(FILE **in, FILE **out, char *command, char *param)
1075{
1076 char *argv[3] = { command, param, NULL };
1077 struct fd_pair infd, outfd;
1078 pid_t pid;
1079
1080 xpiped_pair(infd);
1081 xpiped_pair(outfd);
1082
1083 fflush_all();
1084 pid = xvfork();
1085
1086 if (pid == 0) {
1087 /* Child */
1088 /* NB: close _first_, then move fds! */
1089 close(infd.wr);
1090 close(outfd.rd);
1091 xmove_fd(infd.rd, 0);
1092 xmove_fd(outfd.wr, 1);
1093 BB_EXECVP_or_die(argv);
1094 }
1095 /* parent */
1096 close(infd.rd);
1097 close(outfd.wr);
1098 *in = xfdopen_for_write(infd.wr);
1099 *out = xfdopen_for_read(outfd.rd);
1100 return pid;
1101}
1102
1103static char *run_mapping(char *physical, struct mapping_defn_t *map)
1104{
1105 FILE *in, *out;
1106 int i, status;
1107 pid_t pid;
1108
1109 char *logical = xstrdup(physical);
1110
1111 /* Run the mapping script. Never fails. */
1112 pid = popen2(&in, &out, map->script, physical);
1113
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]);
1117 }
1118 fclose(in);
1119 safe_waitpid(pid, &status, 0);
1120
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);
1126
1127 if (new_logical) {
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;
1132
1133 while (pch >= new_logical && isspace(*pch))
1134 *(pch--) = '\0';
1135
1136 free(logical);
1137 logical = new_logical;
1138 }
1139 }
1140
1141 fclose(out);
1142
1143 return logical;
1144}
1145#endif /* FEATURE_IFUPDOWN_MAPPING */
1146
1147static llist_t *find_iface_state(llist_t *state_list, const char *iface)
1148{
1149 unsigned iface_len = strlen(iface);
1150 llist_t *search = state_list;
1151
1152 while (search) {
1153 if ((strncmp(search->data, iface, iface_len) == 0)
1154 && (search->data[iface_len] == '=')
1155 ) {
1156 return search;
1157 }
1158 search = search->link;
1159 }
1160 return NULL;
1161}
1162
1163/* read the previous state from the state file */
1164static llist_t *read_iface_state(void)
1165{
1166 llist_t *state_list = NULL;
1167 FILE *state_fp = fopen_for_read(CONFIG_IFUPDOWN_IFSTATE_PATH);
1168
1169 if (state_fp) {
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");
1174 *end_ptr = '\0';
1175 llist_add_to(&state_list, start);
1176 }
1177 fclose(state_fp);
1178 }
1179 return state_list;
1180}
1181
1182
1183int ifupdown_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1184int ifupdown_main(int argc UNUSED_PARAM, char **argv)
1185{
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;
1191
1192 INIT_G();
1193
1194 G.startup_PATH = getenv("PATH");
1195 G.shell = xstrdup(get_shell_name());
1196
1197 cmds = iface_down;
1198 if (applet_name[2] == 'u') {
1199 /* ifup command */
1200 cmds = iface_up;
1201 }
1202
1203 getopt32(argv, OPTION_STR, &interfaces);
1204 argv += optind;
1205 if (argv[0]) {
1206 if (DO_ALL) bb_show_usage();
1207 } else {
1208 if (!DO_ALL) bb_show_usage();
1209 }
1210
1211 defn = read_interfaces(interfaces, NULL);
1212
1213 /* Create a list of interfaces to work on */
1214 if (DO_ALL) {
1215 target_list = defn->autointerfaces;
1216 } else {
1217 llist_add_to_end(&target_list, argv[0]);
1218 }
1219
1220 /* Update the interfaces */
1221 while (target_list) {
1222 llist_t *iface_list;
1223 struct interface_defn_t *currif;
1224 char *iface;
1225 char *liface;
1226 char *pch;
1227 bool okay = 0;
1228 int cmds_ret;
1229
1230 iface = xstrdup(target_list->data);
1231 target_list = target_list->link;
1232
1233 pch = strchr(iface, '=');
1234 if (pch) {
1235 *pch = '\0';
1236 liface = xstrdup(pch + 1);
1237 } else {
1238 liface = xstrdup(iface);
1239 }
1240
1241 if (!FORCE) {
1242 llist_t *state_list = read_iface_state();
1243 const llist_t *iface_state = find_iface_state(state_list, iface);
1244
1245 if (cmds == iface_up) {
1246 /* ifup */
1247 if (iface_state) {
1248 bb_error_msg("interface %s already configured", iface);
1249 goto next;
1250 }
1251 } else {
1252 /* ifdown */
1253 if (!iface_state) {
1254 bb_error_msg("interface %s not configured", iface);
1255 goto next;
1256 }
1257 }
1258 llist_free(state_list, free);
1259 }
1260
1261#if ENABLE_FEATURE_IFUPDOWN_MAPPING
1262 if ((cmds == iface_up) && !NO_MAPPINGS) {
1263 struct mapping_defn_t *currmap;
1264
1265 for (currmap = defn->mappings; currmap; currmap = currmap->next) {
1266 int i;
1267 for (i = 0; i < currmap->n_matches; i++) {
1268 if (fnmatch(currmap->match[i], liface, 0) != 0)
1269 continue;
1270 if (VERBOSE) {
1271 printf("Running mapping script %s on %s\n", currmap->script, liface);
1272 }
1273 liface = run_mapping(iface, currmap);
1274 break;
1275 }
1276 }
1277 }
1278#endif
1279
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;
1285
1286 okay = 1;
1287 currif->iface = iface;
1288
1289 debug_noise("\nConfiguring interface %s (%s)\n", liface, currif->address_family->name);
1290
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);
1296 any_failures = 1;
1297 } else if (cmds_ret == 0) {
1298 any_failures = 1;
1299 }
1300
1301 currif->iface = oldiface;
1302 }
1303 iface_list = iface_list->link;
1304 }
1305 if (VERBOSE) {
1306 bb_putchar('\n');
1307 }
1308
1309 if (!okay && !FORCE) {
1310 bb_error_msg("ignoring unknown interface %s", liface);
1311 any_failures = 1;
1312 } else if (!NO_ACT) {
1313 /* update the state file */
1314 FILE *state_fp;
1315 llist_t *state;
1316 llist_t *state_list = read_iface_state();
1317 llist_t *iface_state = find_iface_state(state_list, iface);
1318
1319 if (cmds == iface_up && !any_failures) {
1320 char *newiface = xasprintf("%s=%s", iface, liface);
1321 if (!iface_state) {
1322 llist_add_to_end(&state_list, newiface);
1323 } else {
1324 free(iface_state->data);
1325 iface_state->data = newiface;
1326 }
1327 } else {
1328 /* Remove an interface from state_list */
1329 llist_unlink(&state_list, iface_state);
1330 free(llist_pop(&iface_state));
1331 }
1332
1333 /* Actually write the new state */
1334 state_fp = xfopen_for_write(CONFIG_IFUPDOWN_IFSTATE_PATH);
1335 state = state_list;
1336 while (state) {
1337 if (state->data) {
1338 fprintf(state_fp, "%s\n", state->data);
1339 }
1340 state = state->link;
1341 }
1342 fclose(state_fp);
1343 llist_free(state_list, free);
1344 }
1345 next:
1346 free(iface);
1347 free(liface);
1348 }
1349
1350 return any_failures;
1351}
1352
generated by cgit at 2024-05-15 04:37:26 (GMT)