source: MondoRescue/trunk/mindi-busybox/networking/ifconfig.c@ 954

Last change on this file since 954 was 821, checked in by Bruno Cornec, 18 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)
File size: 16.5 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 <stdio.h>
30#include <stdlib.h>
31#include <string.h> /* strcmp and friends */
32#include <ctype.h> /* isdigit and friends */
33#include <stddef.h> /* offsetof */
34#include <unistd.h>
35#include <netdb.h>
36#include <sys/ioctl.h>
37#include <net/if.h>
38#include <net/if_arp.h>
39#include <netinet/in.h>
40#if __GLIBC__ >=2 && __GLIBC_MINOR >= 1
41#include <netpacket/packet.h>
42#include <net/ethernet.h>
43#else
44#include <sys/types.h>
45#include <netinet/if_ether.h>
46#endif
47#include "inet_common.h"
48#include "busybox.h"
49
50#ifdef CONFIG_FEATURE_IFCONFIG_SLIP
51# include <net/if_slip.h>
52#endif
53
54/* I don't know if this is needed for busybox or not. Anyone? */
55#define QUESTIONABLE_ALIAS_CASE
56
57
58/* Defines for glibc2.0 users. */
59#ifndef SIOCSIFTXQLEN
60# define SIOCSIFTXQLEN 0x8943
61# define SIOCGIFTXQLEN 0x8942
62#endif
63
64/* ifr_qlen is ifru_ivalue, but it isn't present in 2.0 kernel headers */
65#ifndef ifr_qlen
66# define ifr_qlen ifr_ifru.ifru_mtu
67#endif
68
69#ifndef IFF_DYNAMIC
70# define IFF_DYNAMIC 0x8000 /* dialup device with changing addresses */
71#endif
72
73#ifdef CONFIG_FEATURE_IPV6
74struct in6_ifreq {
75 struct in6_addr ifr6_addr;
76 uint32_t ifr6_prefixlen;
77 int ifr6_ifindex;
78};
79#endif
80
81/*
82 * Here are the bit masks for the "flags" member of struct options below.
83 * N_ signifies no arg prefix; M_ signifies arg prefixed by '-'.
84 * CLR clears the flag; SET sets the flag; ARG signifies (optional) arg.
85 */
86#define N_CLR 0x01
87#define M_CLR 0x02
88#define N_SET 0x04
89#define M_SET 0x08
90#define N_ARG 0x10
91#define M_ARG 0x20
92
93#define M_MASK (M_CLR | M_SET | M_ARG)
94#define N_MASK (N_CLR | N_SET | N_ARG)
95#define SET_MASK (N_SET | M_SET)
96#define CLR_MASK (N_CLR | M_CLR)
97#define SET_CLR_MASK (SET_MASK | CLR_MASK)
98#define ARG_MASK (M_ARG | N_ARG)
99
100/*
101 * Here are the bit masks for the "arg_flags" member of struct options below.
102 */
103
104/*
105 * cast type:
106 * 00 int
107 * 01 char *
108 * 02 HOST_COPY in_ether
109 * 03 HOST_COPY INET_resolve
110 */
111#define A_CAST_TYPE 0x03
112/*
113 * map type:
114 * 00 not a map type (mem_start, io_addr, irq)
115 * 04 memstart (unsigned long)
116 * 08 io_addr (unsigned short)
117 * 0C irq (unsigned char)
118 */
119#define A_MAP_TYPE 0x0C
120#define A_ARG_REQ 0x10 /* Set if an arg is required. */
121#define A_NETMASK 0x20 /* Set if netmask (check for multiple sets). */
122#define A_SET_AFTER 0x40 /* Set a flag at the end. */
123#define A_COLON_CHK 0x80 /* Is this needed? See below. */
124#ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
125#define A_HOSTNAME 0x100 /* Set if it is ip addr. */
126#define A_BROADCAST 0x200 /* Set if it is broadcast addr. */
127#else
128#define A_HOSTNAME 0
129#define A_BROADCAST 0
130#endif
131
132/*
133 * These defines are for dealing with the A_CAST_TYPE field.
134 */
135#define A_CAST_CHAR_PTR 0x01
136#define A_CAST_RESOLVE 0x01
137#define A_CAST_HOST_COPY 0x02
138#define A_CAST_HOST_COPY_IN_ETHER A_CAST_HOST_COPY
139#define A_CAST_HOST_COPY_RESOLVE (A_CAST_HOST_COPY | A_CAST_RESOLVE)
140
141/*
142 * These defines are for dealing with the A_MAP_TYPE field.
143 */
144#define A_MAP_ULONG 0x04 /* memstart */
145#define A_MAP_USHORT 0x08 /* io_addr */
146#define A_MAP_UCHAR 0x0C /* irq */
147
148/*
149 * Define the bit masks signifying which operations to perform for each arg.
150 */
151
152#define ARG_METRIC (A_ARG_REQ /*| A_CAST_INT*/)
153#define ARG_MTU (A_ARG_REQ /*| A_CAST_INT*/)
154#define ARG_TXQUEUELEN (A_ARG_REQ /*| A_CAST_INT*/)
155#define ARG_MEM_START (A_ARG_REQ | A_MAP_ULONG)
156#define ARG_IO_ADDR (A_ARG_REQ | A_MAP_ULONG)
157#define ARG_IRQ (A_ARG_REQ | A_MAP_UCHAR)
158#define ARG_DSTADDR (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE)
159#define ARG_NETMASK (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_NETMASK)
160#define ARG_BROADCAST (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_BROADCAST)
161#define ARG_HW (A_ARG_REQ | A_CAST_HOST_COPY_IN_ETHER)
162#define ARG_POINTOPOINT (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
163#define ARG_KEEPALIVE (A_ARG_REQ | A_CAST_CHAR_PTR)
164#define ARG_OUTFILL (A_ARG_REQ | A_CAST_CHAR_PTR)
165#define ARG_HOSTNAME (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_COLON_CHK | A_HOSTNAME)
166#define ARG_ADD_DEL (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
167
168
169/*
170 * Set up the tables. Warning! They must have corresponding order!
171 */
172
173struct arg1opt {
174 const char *name;
175 int selector;
176 unsigned short ifr_offset;
177};
178
179struct options {
180 const char *name;
181#ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
182 const unsigned int flags:6;
183 const unsigned int arg_flags:10;
184#else
185 const unsigned char flags;
186 const unsigned char arg_flags;
187#endif
188 const unsigned short selector;
189};
190
191#define ifreq_offsetof(x) offsetof(struct ifreq, x)
192
193static const struct arg1opt Arg1Opt[] = {
194 {"SIOCSIFMETRIC", SIOCSIFMETRIC, ifreq_offsetof(ifr_metric)},
195 {"SIOCSIFMTU", SIOCSIFMTU, ifreq_offsetof(ifr_mtu)},
196 {"SIOCSIFTXQLEN", SIOCSIFTXQLEN, ifreq_offsetof(ifr_qlen)},
197 {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
198 {"SIOCSIFNETMASK", SIOCSIFNETMASK, ifreq_offsetof(ifr_netmask)},
199 {"SIOCSIFBRDADDR", SIOCSIFBRDADDR, ifreq_offsetof(ifr_broadaddr)},
200#ifdef CONFIG_FEATURE_IFCONFIG_HW
201 {"SIOCSIFHWADDR", SIOCSIFHWADDR, ifreq_offsetof(ifr_hwaddr)},
202#endif
203 {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
204#ifdef SIOCSKEEPALIVE
205 {"SIOCSKEEPALIVE", SIOCSKEEPALIVE, ifreq_offsetof(ifr_data)},
206#endif
207#ifdef SIOCSOUTFILL
208 {"SIOCSOUTFILL", SIOCSOUTFILL, ifreq_offsetof(ifr_data)},
209#endif
210#ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
211 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.mem_start)},
212 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.base_addr)},
213 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.irq)},
214#endif
215 /* Last entry if for unmatched (possibly hostname) arg. */
216#ifdef CONFIG_FEATURE_IPV6
217 {"SIOCSIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
218 {"SIOCDIFADDR", SIOCDIFADDR, ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
219#endif
220 {"SIOCSIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr)},
221};
222
223static const struct options OptArray[] = {
224 {"metric", N_ARG, ARG_METRIC, 0},
225 {"mtu", N_ARG, ARG_MTU, 0},
226 {"txqueuelen", N_ARG, ARG_TXQUEUELEN, 0},
227 {"dstaddr", N_ARG, ARG_DSTADDR, 0},
228 {"netmask", N_ARG, ARG_NETMASK, 0},
229 {"broadcast", N_ARG | M_CLR, ARG_BROADCAST, IFF_BROADCAST},
230#ifdef CONFIG_FEATURE_IFCONFIG_HW
231 {"hw", N_ARG, ARG_HW, 0},
232#endif
233 {"pointopoint", N_ARG | M_CLR, ARG_POINTOPOINT, IFF_POINTOPOINT},
234#ifdef SIOCSKEEPALIVE
235 {"keepalive", N_ARG, ARG_KEEPALIVE, 0},
236#endif
237#ifdef SIOCSOUTFILL
238 {"outfill", N_ARG, ARG_OUTFILL, 0},
239#endif
240#ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
241 {"mem_start", N_ARG, ARG_MEM_START, 0},
242 {"io_addr", N_ARG, ARG_IO_ADDR, 0},
243 {"irq", N_ARG, ARG_IRQ, 0},
244#endif
245#ifdef CONFIG_FEATURE_IPV6
246 {"add", N_ARG, ARG_ADD_DEL, 0},
247 {"del", N_ARG, ARG_ADD_DEL, 0},
248#endif
249 {"arp", N_CLR | M_SET, 0, IFF_NOARP},
250 {"trailers", N_CLR | M_SET, 0, IFF_NOTRAILERS},
251 {"promisc", N_SET | M_CLR, 0, IFF_PROMISC},
252 {"multicast", N_SET | M_CLR, 0, IFF_MULTICAST},
253 {"allmulti", N_SET | M_CLR, 0, IFF_ALLMULTI},
254 {"dynamic", N_SET | M_CLR, 0, IFF_DYNAMIC},
255 {"up", N_SET, 0, (IFF_UP | IFF_RUNNING)},
256 {"down", N_CLR, 0, IFF_UP},
257 {NULL, 0, ARG_HOSTNAME, (IFF_UP | IFF_RUNNING)}
258};
259
260/*
261 * A couple of prototypes.
262 */
263
264#ifdef CONFIG_FEATURE_IFCONFIG_HW
265static int in_ether(char *bufp, struct sockaddr *sap);
266#endif
267
268#ifdef CONFIG_FEATURE_IFCONFIG_STATUS
269extern int interface_opt_a;
270extern int display_interfaces(char *ifname);
271#endif
272
273/*
274 * Our main function.
275 */
276
277int ifconfig_main(int argc, char **argv)
278{
279 struct ifreq ifr;
280 struct sockaddr_in sai;
281#ifdef CONFIG_FEATURE_IPV6
282 struct sockaddr_in6 sai6;
283#endif
284#ifdef CONFIG_FEATURE_IFCONFIG_HW
285 struct sockaddr sa;
286#endif
287 const struct arg1opt *a1op;
288 const struct options *op;
289 int sockfd; /* socket fd we use to manipulate stuff with */
290 int goterr;
291 int selector;
292#ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
293 unsigned int mask;
294 unsigned int did_flags;
295 unsigned int sai_hostname, sai_netmask;
296#else
297 unsigned char mask;
298 unsigned char did_flags;
299#endif
300 char *p;
301 char host[128];
302
303 goterr = 0;
304 did_flags = 0;
305#ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
306 sai_hostname = 0;
307 sai_netmask = 0;
308#endif
309
310 /* skip argv[0] */
311 ++argv;
312 --argc;
313
314#ifdef CONFIG_FEATURE_IFCONFIG_STATUS
315 if ((argc > 0) && (((*argv)[0] == '-') && ((*argv)[1] == 'a') && !(*argv)[2])) {
316 interface_opt_a = 1;
317 --argc;
318 ++argv;
319 }
320#endif
321
322 if (argc <= 1) {
323#ifdef CONFIG_FEATURE_IFCONFIG_STATUS
324 return display_interfaces(argc ? *argv : NULL);
325#else
326 bb_error_msg_and_die
327 ("ifconfig was not compiled with interface status display support.");
328#endif
329 }
330
331 /* Create a channel to the NET kernel. */
332 sockfd = bb_xsocket(AF_INET, SOCK_DGRAM, 0);
333
334 /* get interface name */
335 safe_strncpy(ifr.ifr_name, *argv, IFNAMSIZ);
336
337 /* Process the remaining arguments. */
338 while (*++argv != (char *) NULL) {
339 p = *argv;
340 mask = N_MASK;
341 if (*p == '-') { /* If the arg starts with '-'... */
342 ++p; /* advance past it and */
343 mask = M_MASK; /* set the appropriate mask. */
344 }
345 for (op = OptArray; op->name; op++) { /* Find table entry. */
346 if (strcmp(p, op->name) == 0) { /* If name matches... */
347 if ((mask &= op->flags)) { /* set the mask and go. */
348 goto FOUND_ARG;
349 }
350 /* If we get here, there was a valid arg with an */
351 /* invalid '-' prefix. */
352 ++goterr;
353 goto LOOP;
354 }
355 }
356
357 /* We fell through, so treat as possible hostname. */
358 a1op = Arg1Opt + (sizeof(Arg1Opt) / sizeof(Arg1Opt[0])) - 1;
359 mask = op->arg_flags;
360 goto HOSTNAME;
361
362 FOUND_ARG:
363 if (mask & ARG_MASK) {
364 mask = op->arg_flags;
365 a1op = Arg1Opt + (op - OptArray);
366 if (mask & A_NETMASK & did_flags) {
367 bb_show_usage();
368 }
369 if (*++argv == NULL) {
370 if (mask & A_ARG_REQ) {
371 bb_show_usage();
372 } else {
373 --argv;
374 mask &= A_SET_AFTER; /* just for broadcast */
375 }
376 } else { /* got an arg so process it */
377 HOSTNAME:
378 did_flags |= (mask & (A_NETMASK|A_HOSTNAME));
379 if (mask & A_CAST_HOST_COPY) {
380#ifdef CONFIG_FEATURE_IFCONFIG_HW
381 if (mask & A_CAST_RESOLVE) {
382#endif
383#ifdef CONFIG_FEATURE_IPV6
384 char *prefix;
385 int prefix_len = 0;
386#endif
387
388 safe_strncpy(host, *argv, (sizeof host));
389#ifdef CONFIG_FEATURE_IPV6
390 if ((prefix = strchr(host, '/'))) {
391 if (safe_strtoi(prefix + 1, &prefix_len) ||
392 (prefix_len < 0) || (prefix_len > 128))
393 {
394 ++goterr;
395 goto LOOP;
396 }
397 *prefix = 0;
398 }
399#endif
400
401 sai.sin_family = AF_INET;
402 sai.sin_port = 0;
403 if (!strcmp(host, bb_INET_default)) {
404 /* Default is special, meaning 0.0.0.0. */
405 sai.sin_addr.s_addr = INADDR_ANY;
406#ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
407 } else if (((host[0] == '+') && !host[1]) && (mask & A_BROADCAST) &&
408 (did_flags & (A_NETMASK|A_HOSTNAME)) == (A_NETMASK|A_HOSTNAME)) {
409 /* + is special, meaning broadcast is derived. */
410 sai.sin_addr.s_addr = (~sai_netmask) | (sai_hostname & sai_netmask);
411#endif
412#ifdef CONFIG_FEATURE_IPV6
413 } else if (inet_pton(AF_INET6, host, &sai6.sin6_addr) > 0) {
414 int sockfd6;
415 struct in6_ifreq ifr6;
416
417 memcpy((char *) &ifr6.ifr6_addr,
418 (char *) &sai6.sin6_addr,
419 sizeof(struct in6_addr));
420
421 /* Create a channel to the NET kernel. */
422 if ((sockfd6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
423 bb_perror_msg_and_die("socket6");
424 }
425 if (ioctl(sockfd6, SIOGIFINDEX, &ifr) < 0) {
426 perror("SIOGIFINDEX");
427 ++goterr;
428 continue;
429 }
430 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
431 ifr6.ifr6_prefixlen = prefix_len;
432 if (ioctl(sockfd6, a1op->selector, &ifr6) < 0) {
433 perror(a1op->name);
434 ++goterr;
435 }
436 continue;
437#endif
438 } else if (inet_aton(host, &sai.sin_addr) == 0) {
439 /* It's not a dotted quad. */
440 struct hostent *hp;
441 if ((hp = gethostbyname(host)) == (struct hostent *)NULL) {
442 ++goterr;
443 continue;
444 }
445 memcpy((char *) &sai.sin_addr, (char *) hp->h_addr_list[0],
446 sizeof(struct in_addr));
447 }
448#ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
449 if (mask & A_HOSTNAME) {
450 sai_hostname = sai.sin_addr.s_addr;
451 }
452 if (mask & A_NETMASK) {
453 sai_netmask = sai.sin_addr.s_addr;
454 }
455#endif
456 p = (char *) &sai;
457#ifdef CONFIG_FEATURE_IFCONFIG_HW
458 } else { /* A_CAST_HOST_COPY_IN_ETHER */
459 /* This is the "hw" arg case. */
460 if (strcmp("ether", *argv) || (*++argv == NULL)) {
461 bb_show_usage();
462 }
463 safe_strncpy(host, *argv, (sizeof host));
464 if (in_ether(host, &sa)) {
465 bb_error_msg("invalid hw-addr %s", host);
466 ++goterr;
467 continue;
468 }
469 p = (char *) &sa;
470 }
471#endif
472 memcpy((((char *) (&ifr)) + a1op->ifr_offset),
473 p, sizeof(struct sockaddr));
474 } else {
475 unsigned long i = strtoul(*argv, NULL, 0);
476
477 p = ((char *) (&ifr)) + a1op->ifr_offset;
478#ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
479 if (mask & A_MAP_TYPE) {
480 if (ioctl(sockfd, SIOCGIFMAP, &ifr) < 0) {
481 ++goterr;
482 continue;
483 }
484 if ((mask & A_MAP_UCHAR) == A_MAP_UCHAR) {
485 *((unsigned char *) p) = i;
486 } else if (mask & A_MAP_USHORT) {
487 *((unsigned short *) p) = i;
488 } else {
489 *((unsigned long *) p) = i;
490 }
491 } else
492#endif
493 if (mask & A_CAST_CHAR_PTR) {
494 *((caddr_t *) p) = (caddr_t) i;
495 } else { /* A_CAST_INT */
496 *((int *) p) = i;
497 }
498 }
499
500 if (ioctl(sockfd, a1op->selector, &ifr) < 0) {
501 perror(a1op->name);
502 ++goterr;
503 continue;
504 }
505#ifdef QUESTIONABLE_ALIAS_CASE
506 if (mask & A_COLON_CHK) {
507 /*
508 * Don't do the set_flag() if the address is an alias with
509 * a - at the end, since it's deleted already! - Roman
510 *
511 * Should really use regex.h here, not sure though how well
512 * it'll go with the cross-platform support etc.
513 */
514 char *ptr;
515 short int found_colon = 0;
516
517 for (ptr = ifr.ifr_name; *ptr; ptr++) {
518 if (*ptr == ':') {
519 found_colon++;
520 }
521 }
522
523 if (found_colon && *(ptr - 1) == '-') {
524 continue;
525 }
526 }
527#endif
528 }
529 if (!(mask & A_SET_AFTER)) {
530 continue;
531 }
532 mask = N_SET;
533 }
534
535 if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
536 perror("SIOCGIFFLAGS");
537 ++goterr;
538 } else {
539 selector = op->selector;
540 if (mask & SET_MASK) {
541 ifr.ifr_flags |= selector;
542 } else {
543 ifr.ifr_flags &= ~selector;
544 }
545 if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
546 perror("SIOCSIFFLAGS");
547 ++goterr;
548 }
549 }
550 LOOP:
551 continue;
552 } /* end of while-loop */
553
554 if (ENABLE_FEATURE_CLEAN_UP) close(sockfd);
555 return goterr;
556}
557
558#ifdef CONFIG_FEATURE_IFCONFIG_HW
559/* Input an Ethernet address and convert to binary. */
560static int in_ether(char *bufp, struct sockaddr *sap)
561{
562 char *ptr;
563 int i, j;
564 unsigned char val;
565 unsigned char c;
566
567 sap->sa_family = ARPHRD_ETHER;
568 ptr = sap->sa_data;
569
570 i = 0;
571 do {
572 j = val = 0;
573
574 /* We might get a semicolon here - not required. */
575 if (i && (*bufp == ':')) {
576 bufp++;
577 }
578
579 do {
580 c = *bufp;
581 if (((unsigned char)(c - '0')) <= 9) {
582 c -= '0';
583 } else if (((unsigned char)((c|0x20) - 'a')) <= 5) {
584 c = (c|0x20) - ('a'-10);
585 } else if (j && (c == ':' || c == 0)) {
586 break;
587 } else {
588 return -1;
589 }
590 ++bufp;
591 val <<= 4;
592 val += c;
593 } while (++j < 2);
594 *ptr++ = val;
595 } while (++i < ETH_ALEN);
596
597 return (int) (*bufp); /* Error if we don't end at end of string. */
598}
599#endif
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