source: MondoRescue/branches/2.2.5/mindi-busybox/networking/ifconfig.c@ 1765

Last change on this file since 1765 was 1765, checked in by Bruno Cornec, 16 years ago

Update to busybox 1.7.2
File size: 15.5 KB
Line 
1/* vi: set sw=4 ts=4: */
2/* ifconfig
3 *
4 * Similar to the standard Unix ifconfig, but with only the necessary
5 * parts for AF_INET, and without any printing of if info (for now).
6 *
7 * Bjorn Wesen, Axis Communications AB
8 *
9 *
10 * Authors of the original ifconfig was:
11 * Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
12 *
13 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
14 */
15
16/*
17 * Heavily modified by Manuel Novoa III Mar 6, 2001
18 *
19 * From initial port to busybox, removed most of the redundancy by
20 * converting to a table-driven approach. Added several (optional)
21 * args missing from initial port.
22 *
23 * Still missing: media, tunnel.
24 *
25 * 2002-04-20
26 * IPV6 support added by Bart Visscher <magick@linux-fan.com>
27 */
28
29#include <net/if.h>
30#include <net/if_arp.h>
31#include <netinet/in.h>
32#if defined(__GLIBC__) && __GLIBC__ >=2 && __GLIBC_MINOR__ >= 1
33#include <netpacket/packet.h>
34#include <net/ethernet.h>
35#else
36#include <sys/types.h>
37#include <netinet/if_ether.h>
38#endif
39#include "inet_common.h"
40#include "libbb.h"
41
42#if ENABLE_FEATURE_IFCONFIG_SLIP
43# include <net/if_slip.h>
44#endif
45
46/* I don't know if this is needed for busybox or not. Anyone? */
47#define QUESTIONABLE_ALIAS_CASE
48
49
50/* Defines for glibc2.0 users. */
51#ifndef SIOCSIFTXQLEN
52# define SIOCSIFTXQLEN 0x8943
53# define SIOCGIFTXQLEN 0x8942
54#endif
55
56/* ifr_qlen is ifru_ivalue, but it isn't present in 2.0 kernel headers */
57#ifndef ifr_qlen
58# define ifr_qlen ifr_ifru.ifru_mtu
59#endif
60
61#ifndef IFF_DYNAMIC
62# define IFF_DYNAMIC 0x8000 /* dialup device with changing addresses */
63#endif
64
65#if ENABLE_FEATURE_IPV6
66struct in6_ifreq {
67 struct in6_addr ifr6_addr;
68 uint32_t ifr6_prefixlen;
69 int ifr6_ifindex;
70};
71#endif
72
73/*
74 * Here are the bit masks for the "flags" member of struct options below.
75 * N_ signifies no arg prefix; M_ signifies arg prefixed by '-'.
76 * CLR clears the flag; SET sets the flag; ARG signifies (optional) arg.
77 */
78#define N_CLR 0x01
79#define M_CLR 0x02
80#define N_SET 0x04
81#define M_SET 0x08
82#define N_ARG 0x10
83#define M_ARG 0x20
84
85#define M_MASK (M_CLR | M_SET | M_ARG)
86#define N_MASK (N_CLR | N_SET | N_ARG)
87#define SET_MASK (N_SET | M_SET)
88#define CLR_MASK (N_CLR | M_CLR)
89#define SET_CLR_MASK (SET_MASK | CLR_MASK)
90#define ARG_MASK (M_ARG | N_ARG)
91
92/*
93 * Here are the bit masks for the "arg_flags" member of struct options below.
94 */
95
96/*
97 * cast type:
98 * 00 int
99 * 01 char *
100 * 02 HOST_COPY in_ether
101 * 03 HOST_COPY INET_resolve
102 */
103#define A_CAST_TYPE 0x03
104/*
105 * map type:
106 * 00 not a map type (mem_start, io_addr, irq)
107 * 04 memstart (unsigned long)
108 * 08 io_addr (unsigned short)
109 * 0C irq (unsigned char)
110 */
111#define A_MAP_TYPE 0x0C
112#define A_ARG_REQ 0x10 /* Set if an arg is required. */
113#define A_NETMASK 0x20 /* Set if netmask (check for multiple sets). */
114#define A_SET_AFTER 0x40 /* Set a flag at the end. */
115#define A_COLON_CHK 0x80 /* Is this needed? See below. */
116#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
117#define A_HOSTNAME 0x100 /* Set if it is ip addr. */
118#define A_BROADCAST 0x200 /* Set if it is broadcast addr. */
119#else
120#define A_HOSTNAME 0
121#define A_BROADCAST 0
122#endif
123
124/*
125 * These defines are for dealing with the A_CAST_TYPE field.
126 */
127#define A_CAST_CHAR_PTR 0x01
128#define A_CAST_RESOLVE 0x01
129#define A_CAST_HOST_COPY 0x02
130#define A_CAST_HOST_COPY_IN_ETHER A_CAST_HOST_COPY
131#define A_CAST_HOST_COPY_RESOLVE (A_CAST_HOST_COPY | A_CAST_RESOLVE)
132
133/*
134 * These defines are for dealing with the A_MAP_TYPE field.
135 */
136#define A_MAP_ULONG 0x04 /* memstart */
137#define A_MAP_USHORT 0x08 /* io_addr */
138#define A_MAP_UCHAR 0x0C /* irq */
139
140/*
141 * Define the bit masks signifying which operations to perform for each arg.
142 */
143
144#define ARG_METRIC (A_ARG_REQ /*| A_CAST_INT*/)
145#define ARG_MTU (A_ARG_REQ /*| A_CAST_INT*/)
146#define ARG_TXQUEUELEN (A_ARG_REQ /*| A_CAST_INT*/)
147#define ARG_MEM_START (A_ARG_REQ | A_MAP_ULONG)
148#define ARG_IO_ADDR (A_ARG_REQ | A_MAP_ULONG)
149#define ARG_IRQ (A_ARG_REQ | A_MAP_UCHAR)
150#define ARG_DSTADDR (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE)
151#define ARG_NETMASK (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_NETMASK)
152#define ARG_BROADCAST (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_BROADCAST)
153#define ARG_HW (A_ARG_REQ | A_CAST_HOST_COPY_IN_ETHER)
154#define ARG_POINTOPOINT (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
155#define ARG_KEEPALIVE (A_ARG_REQ | A_CAST_CHAR_PTR)
156#define ARG_OUTFILL (A_ARG_REQ | A_CAST_CHAR_PTR)
157#define ARG_HOSTNAME (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_COLON_CHK | A_HOSTNAME)
158#define ARG_ADD_DEL (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
159
160
161/*
162 * Set up the tables. Warning! They must have corresponding order!
163 */
164
165struct arg1opt {
166 const char *name;
167 int selector;
168 unsigned short ifr_offset;
169};
170
171struct options {
172 const char *name;
173#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
174 const unsigned int flags:6;
175 const unsigned int arg_flags:10;
176#else
177 const unsigned char flags;
178 const unsigned char arg_flags;
179#endif
180 const unsigned short selector;
181};
182
183#define ifreq_offsetof(x) offsetof(struct ifreq, x)
184
185static const struct arg1opt Arg1Opt[] = {
186 {"SIOCSIFMETRIC", SIOCSIFMETRIC, ifreq_offsetof(ifr_metric)},
187 {"SIOCSIFMTU", SIOCSIFMTU, ifreq_offsetof(ifr_mtu)},
188 {"SIOCSIFTXQLEN", SIOCSIFTXQLEN, ifreq_offsetof(ifr_qlen)},
189 {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
190 {"SIOCSIFNETMASK", SIOCSIFNETMASK, ifreq_offsetof(ifr_netmask)},
191 {"SIOCSIFBRDADDR", SIOCSIFBRDADDR, ifreq_offsetof(ifr_broadaddr)},
192#if ENABLE_FEATURE_IFCONFIG_HW
193 {"SIOCSIFHWADDR", SIOCSIFHWADDR, ifreq_offsetof(ifr_hwaddr)},
194#endif
195 {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
196#ifdef SIOCSKEEPALIVE
197 {"SIOCSKEEPALIVE", SIOCSKEEPALIVE, ifreq_offsetof(ifr_data)},
198#endif
199#ifdef SIOCSOUTFILL
200 {"SIOCSOUTFILL", SIOCSOUTFILL, ifreq_offsetof(ifr_data)},
201#endif
202#if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
203 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.mem_start)},
204 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.base_addr)},
205 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.irq)},
206#endif
207 /* Last entry if for unmatched (possibly hostname) arg. */
208#if ENABLE_FEATURE_IPV6
209 {"SIOCSIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
210 {"SIOCDIFADDR", SIOCDIFADDR, ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
211#endif
212 {"SIOCSIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr)},
213};
214
215static const struct options OptArray[] = {
216 {"metric", N_ARG, ARG_METRIC, 0},
217 {"mtu", N_ARG, ARG_MTU, 0},
218 {"txqueuelen", N_ARG, ARG_TXQUEUELEN, 0},
219 {"dstaddr", N_ARG, ARG_DSTADDR, 0},
220 {"netmask", N_ARG, ARG_NETMASK, 0},
221 {"broadcast", N_ARG | M_CLR, ARG_BROADCAST, IFF_BROADCAST},
222#if ENABLE_FEATURE_IFCONFIG_HW
223 {"hw", N_ARG, ARG_HW, 0},
224#endif
225 {"pointopoint", N_ARG | M_CLR, ARG_POINTOPOINT, IFF_POINTOPOINT},
226#ifdef SIOCSKEEPALIVE
227 {"keepalive", N_ARG, ARG_KEEPALIVE, 0},
228#endif
229#ifdef SIOCSOUTFILL
230 {"outfill", N_ARG, ARG_OUTFILL, 0},
231#endif
232#if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
233 {"mem_start", N_ARG, ARG_MEM_START, 0},
234 {"io_addr", N_ARG, ARG_IO_ADDR, 0},
235 {"irq", N_ARG, ARG_IRQ, 0},
236#endif
237#if ENABLE_FEATURE_IPV6
238 {"add", N_ARG, ARG_ADD_DEL, 0},
239 {"del", N_ARG, ARG_ADD_DEL, 0},
240#endif
241 {"arp", N_CLR | M_SET, 0, IFF_NOARP},
242 {"trailers", N_CLR | M_SET, 0, IFF_NOTRAILERS},
243 {"promisc", N_SET | M_CLR, 0, IFF_PROMISC},
244 {"multicast", N_SET | M_CLR, 0, IFF_MULTICAST},
245 {"allmulti", N_SET | M_CLR, 0, IFF_ALLMULTI},
246 {"dynamic", N_SET | M_CLR, 0, IFF_DYNAMIC},
247 {"up", N_SET, 0, (IFF_UP | IFF_RUNNING)},
248 {"down", N_CLR, 0, IFF_UP},
249 {NULL, 0, ARG_HOSTNAME, (IFF_UP | IFF_RUNNING)}
250};
251
252/*
253 * A couple of prototypes.
254 */
255
256#if ENABLE_FEATURE_IFCONFIG_HW
257static int in_ether(const char *bufp, struct sockaddr *sap);
258#endif
259
260/*
261 * Our main function.
262 */
263
264int ifconfig_main(int argc, char **argv);
265int ifconfig_main(int argc, char **argv)
266{
267 struct ifreq ifr;
268 struct sockaddr_in sai;
269#if ENABLE_FEATURE_IFCONFIG_HW
270 struct sockaddr sa;
271#endif
272 const struct arg1opt *a1op;
273 const struct options *op;
274 int sockfd; /* socket fd we use to manipulate stuff with */
275 int selector;
276#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
277 unsigned int mask;
278 unsigned int did_flags;
279 unsigned int sai_hostname, sai_netmask;
280#else
281 unsigned char mask;
282 unsigned char did_flags;
283#endif
284 char *p;
285 /*char host[128];*/
286 const char *host = NULL; /* make gcc happy */
287
288 did_flags = 0;
289#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
290 sai_hostname = 0;
291 sai_netmask = 0;
292#endif
293
294 /* skip argv[0] */
295 ++argv;
296 --argc;
297
298#if ENABLE_FEATURE_IFCONFIG_STATUS
299 if (argc > 0 && (argv[0][0] == '-' && argv[0][1] == 'a' && !argv[0][2])) {
300 interface_opt_a = 1;
301 --argc;
302 ++argv;
303 }
304#endif
305
306 if (argc <= 1) {
307#if ENABLE_FEATURE_IFCONFIG_STATUS
308 return display_interfaces(argc ? *argv : NULL);
309#else
310 bb_error_msg_and_die("no support for status display");
311#endif
312 }
313
314 /* Create a channel to the NET kernel. */
315 sockfd = xsocket(AF_INET, SOCK_DGRAM, 0);
316
317 /* get interface name */
318 safe_strncpy(ifr.ifr_name, *argv, IFNAMSIZ);
319
320 /* Process the remaining arguments. */
321 while (*++argv != (char *) NULL) {
322 p = *argv;
323 mask = N_MASK;
324 if (*p == '-') { /* If the arg starts with '-'... */
325 ++p; /* advance past it and */
326 mask = M_MASK; /* set the appropriate mask. */
327 }
328 for (op = OptArray; op->name; op++) { /* Find table entry. */
329 if (strcmp(p, op->name) == 0) { /* If name matches... */
330 mask &= op->flags;
331 if (mask) /* set the mask and go. */
332 goto FOUND_ARG;
333 /* If we get here, there was a valid arg with an */
334 /* invalid '-' prefix. */
335 bb_error_msg_and_die("bad: '%s'", p-1);
336 }
337 }
338
339 /* We fell through, so treat as possible hostname. */
340 a1op = Arg1Opt + ARRAY_SIZE(Arg1Opt) - 1;
341 mask = op->arg_flags;
342 goto HOSTNAME;
343
344 FOUND_ARG:
345 if (mask & ARG_MASK) {
346 mask = op->arg_flags;
347 a1op = Arg1Opt + (op - OptArray);
348 if (mask & A_NETMASK & did_flags)
349 bb_show_usage();
350 if (*++argv == NULL) {
351 if (mask & A_ARG_REQ)
352 bb_show_usage();
353 --argv;
354 mask &= A_SET_AFTER; /* just for broadcast */
355 } else { /* got an arg so process it */
356 HOSTNAME:
357 did_flags |= (mask & (A_NETMASK|A_HOSTNAME));
358 if (mask & A_CAST_HOST_COPY) {
359#if ENABLE_FEATURE_IFCONFIG_HW
360 if (mask & A_CAST_RESOLVE) {
361#endif
362#if ENABLE_FEATURE_IPV6
363 char *prefix;
364 int prefix_len = 0;
365#endif
366 /*safe_strncpy(host, *argv, (sizeof host));*/
367 host = *argv;
368#if ENABLE_FEATURE_IPV6
369 prefix = strchr(host, '/');
370 if (prefix) {
371 prefix_len = xatou_range(prefix + 1, 0, 128);
372 *prefix = '\0';
373 }
374#endif
375 sai.sin_family = AF_INET;
376 sai.sin_port = 0;
377 if (!strcmp(host, bb_str_default)) {
378 /* Default is special, meaning 0.0.0.0. */
379 sai.sin_addr.s_addr = INADDR_ANY;
380 }
381#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
382 else if ((host[0] == '+' && !host[1]) && (mask & A_BROADCAST)
383 && (did_flags & (A_NETMASK|A_HOSTNAME)) == (A_NETMASK|A_HOSTNAME)
384 ) {
385 /* + is special, meaning broadcast is derived. */
386 sai.sin_addr.s_addr = (~sai_netmask) | (sai_hostname & sai_netmask);
387 }
388#endif
389 else {
390 len_and_sockaddr *lsa;
391 if (strcmp(host, "inet") == 0)
392 continue; /* compat stuff */
393 lsa = xhost2sockaddr(host, 0);
394#if ENABLE_FEATURE_IPV6
395 if (lsa->sa.sa_family == AF_INET6) {
396 int sockfd6;
397 struct in6_ifreq ifr6;
398
399 memcpy((char *) &ifr6.ifr6_addr,
400 (char *) &(lsa->sin6.sin6_addr),
401 sizeof(struct in6_addr));
402
403 /* Create a channel to the NET kernel. */
404 sockfd6 = xsocket(AF_INET6, SOCK_DGRAM, 0);
405 xioctl(sockfd6, SIOGIFINDEX, &ifr);
406 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
407 ifr6.ifr6_prefixlen = prefix_len;
408 ioctl_or_perror_and_die(sockfd6, a1op->selector, &ifr6, "%s", a1op->name);
409 if (ENABLE_FEATURE_CLEAN_UP)
410 free(lsa);
411 continue;
412 }
413#endif
414 sai.sin_addr = lsa->sin.sin_addr;
415 if (ENABLE_FEATURE_CLEAN_UP)
416 free(lsa);
417 }
418#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
419 if (mask & A_HOSTNAME)
420 sai_hostname = sai.sin_addr.s_addr;
421 if (mask & A_NETMASK)
422 sai_netmask = sai.sin_addr.s_addr;
423#endif
424 p = (char *) &sai;
425#if ENABLE_FEATURE_IFCONFIG_HW
426 } else { /* A_CAST_HOST_COPY_IN_ETHER */
427 /* This is the "hw" arg case. */
428 if (strcmp("ether", *argv) || !*++argv)
429 bb_show_usage();
430 /*safe_strncpy(host, *argv, sizeof(host));*/
431 host = *argv;
432 if (in_ether(host, &sa))
433 bb_error_msg_and_die("invalid hw-addr %s", host);
434 p = (char *) &sa;
435 }
436#endif
437 memcpy( (((char *)&ifr) + a1op->ifr_offset),
438 p, sizeof(struct sockaddr));
439 } else {
440 /* FIXME: error check?? */
441 unsigned long i = strtoul(*argv, NULL, 0);
442 p = ((char *)&ifr) + a1op->ifr_offset;
443#if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
444 if (mask & A_MAP_TYPE) {
445 xioctl(sockfd, SIOCGIFMAP, &ifr);
446 if ((mask & A_MAP_UCHAR) == A_MAP_UCHAR)
447 *((unsigned char *) p) = i;
448 else if (mask & A_MAP_USHORT)
449 *((unsigned short *) p) = i;
450 else
451 *((unsigned long *) p) = i;
452 } else
453#endif
454 if (mask & A_CAST_CHAR_PTR)
455 *((caddr_t *) p) = (caddr_t) i;
456 else /* A_CAST_INT */
457 *((int *) p) = i;
458 }
459
460 ioctl_or_perror_and_die(sockfd, a1op->selector, &ifr, "%s", a1op->name);
461#ifdef QUESTIONABLE_ALIAS_CASE
462 if (mask & A_COLON_CHK) {
463 /*
464 * Don't do the set_flag() if the address is an alias with
465 * a '-' at the end, since it's deleted already! - Roman
466 *
467 * Should really use regex.h here, not sure though how well
468 * it'll go with the cross-platform support etc.
469 */
470 char *ptr;
471 short int found_colon = 0;
472 for (ptr = ifr.ifr_name; *ptr; ptr++)
473 if (*ptr == ':')
474 found_colon++;
475 if (found_colon && ptr[-1] == '-')
476 continue;
477 }
478#endif
479 }
480 if (!(mask & A_SET_AFTER))
481 continue;
482 mask = N_SET;
483 }
484
485 xioctl(sockfd, SIOCGIFFLAGS, &ifr);
486 selector = op->selector;
487 if (mask & SET_MASK)
488 ifr.ifr_flags |= selector;
489 else
490 ifr.ifr_flags &= ~selector;
491 xioctl(sockfd, SIOCSIFFLAGS, &ifr);
492 } /* while () */
493
494 if (ENABLE_FEATURE_CLEAN_UP)
495 close(sockfd);
496 return 0;
497}
498
499#if ENABLE_FEATURE_IFCONFIG_HW
500/* Input an Ethernet address and convert to binary. */
501static int in_ether(const char *bufp, struct sockaddr *sap)
502{
503 char *ptr;
504 int i, j;
505 unsigned char val;
506 unsigned char c;
507
508 sap->sa_family = ARPHRD_ETHER;
509 ptr = sap->sa_data;
510
511 i = 0;
512 do {
513 j = val = 0;
514
515 /* We might get a semicolon here - not required. */
516 if (i && (*bufp == ':')) {
517 bufp++;
518 }
519
520 do {
521 c = *bufp;
522 if (((unsigned char)(c - '0')) <= 9) {
523 c -= '0';
524 } else if (((unsigned char)((c|0x20) - 'a')) <= 5) {
525 c = (c|0x20) - ('a'-10);
526 } else if (j && (c == ':' || c == 0)) {
527 break;
528 } else {
529 return -1;
530 }
531 ++bufp;
532 val <<= 4;
533 val += c;
534 } while (++j < 2);
535 *ptr++ = val;
536 } while (++i < ETH_ALEN);
537
538 return *bufp; /* Error if we don't end at end of string. */
539}
540#endif
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