source: MondoRescue/branches/2.2.9/mindi-busybox/networking/ifconfig.c@ 3320

Last change on this file since 3320 was 3320, checked in by Bruno Cornec, 9 years ago
  • Re-add (thanks git BTW) the 2.2.9 branch which had been destroyed in the move to 3.0
  • Property svn:eol-style set to native
File size: 15.7 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 source tree.
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 "libbb.h"
40#include "inet_common.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 unsigned short 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 { "SIFMETRIC", SIOCSIFMETRIC, ifreq_offsetof(ifr_metric) },
187 { "SIFMTU", SIOCSIFMTU, ifreq_offsetof(ifr_mtu) },
188 { "SIFTXQLEN", SIOCSIFTXQLEN, ifreq_offsetof(ifr_qlen) },
189 { "SIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr) },
190 { "SIFNETMASK", SIOCSIFNETMASK, ifreq_offsetof(ifr_netmask) },
191 { "SIFBRDADDR", SIOCSIFBRDADDR, ifreq_offsetof(ifr_broadaddr) },
192#if ENABLE_FEATURE_IFCONFIG_HW
193 { "SIFHWADDR", SIOCSIFHWADDR, ifreq_offsetof(ifr_hwaddr) },
194#endif
195 { "SIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr) },
196#ifdef SIOCSKEEPALIVE
197 { "SKEEPALIVE", SIOCSKEEPALIVE, ifreq_offsetof(ifr_data) },
198#endif
199#ifdef SIOCSOUTFILL
200 { "SOUTFILL", SIOCSOUTFILL, ifreq_offsetof(ifr_data) },
201#endif
202#if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
203 { "SIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.mem_start) },
204 { "SIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.base_addr) },
205 { "SIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.irq) },
206#endif
207 /* Last entry if for unmatched (possibly hostname) arg. */
208#if ENABLE_FEATURE_IPV6
209 { "SIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr) }, /* IPv6 version ignores the offset */
210 { "DIFADDR", SIOCDIFADDR, ifreq_offsetof(ifr_addr) }, /* IPv6 version ignores the offset */
211#endif
212 { "SIFADDR", 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#if ENABLE_FEATURE_IFCONFIG_HW
256static int in_ether(const char *bufp, struct sockaddr *sap);
257#endif
258
259/*
260 * Our main function.
261 */
262int ifconfig_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
263int ifconfig_main(int argc UNUSED_PARAM, char **argv)
264{
265 struct ifreq ifr;
266 struct sockaddr_in sai;
267#if ENABLE_FEATURE_IFCONFIG_HW
268 struct sockaddr sa;
269#endif
270 const struct arg1opt *a1op;
271 const struct options *op;
272 int sockfd; /* socket fd we use to manipulate stuff with */
273 int selector;
274#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
275 unsigned int mask;
276 unsigned int did_flags;
277 unsigned int sai_hostname, sai_netmask;
278#else
279 unsigned char mask;
280 unsigned char did_flags;
281#endif
282 char *p;
283 /*char host[128];*/
284 const char *host = NULL; /* make gcc happy */
285
286 did_flags = 0;
287#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
288 sai_hostname = 0;
289 sai_netmask = 0;
290#endif
291
292 /* skip argv[0] */
293 ++argv;
294
295#if ENABLE_FEATURE_IFCONFIG_STATUS
296 if (argv[0] && (argv[0][0] == '-' && argv[0][1] == 'a' && !argv[0][2])) {
297 interface_opt_a = 1;
298 ++argv;
299 }
300#endif
301
302 if (!argv[0] || !argv[1]) { /* one or no args */
303#if ENABLE_FEATURE_IFCONFIG_STATUS
304 return display_interfaces(argv[0] /* can be NULL */);
305#else
306 bb_error_msg_and_die("no support for status display");
307#endif
308 }
309
310 /* Create a channel to the NET kernel. */
311 sockfd = xsocket(AF_INET, SOCK_DGRAM, 0);
312
313 /* get interface name */
314 strncpy_IFNAMSIZ(ifr.ifr_name, *argv);
315
316 /* Process the remaining arguments. */
317 while (*++argv != (char *) NULL) {
318 p = *argv;
319 mask = N_MASK;
320 if (*p == '-') { /* If the arg starts with '-'... */
321 ++p; /* advance past it and */
322 mask = M_MASK; /* set the appropriate mask. */
323 }
324 for (op = OptArray; op->name; op++) { /* Find table entry. */
325 if (strcmp(p, op->name) == 0) { /* If name matches... */
326 mask &= op->flags;
327 if (mask) /* set the mask and go. */
328 goto FOUND_ARG;
329 /* If we get here, there was a valid arg with an */
330 /* invalid '-' prefix. */
331 bb_error_msg_and_die("bad: '%s'", p-1);
332 }
333 }
334
335 /* We fell through, so treat as possible hostname. */
336 a1op = Arg1Opt + ARRAY_SIZE(Arg1Opt) - 1;
337 mask = op->arg_flags;
338 goto HOSTNAME;
339
340 FOUND_ARG:
341 if (mask & ARG_MASK) {
342 mask = op->arg_flags;
343 a1op = Arg1Opt + (op - OptArray);
344 if (mask & A_NETMASK & did_flags)
345 bb_show_usage();
346 if (*++argv == NULL) {
347 if (mask & A_ARG_REQ)
348 bb_show_usage();
349 --argv;
350 mask &= A_SET_AFTER; /* just for broadcast */
351 } else { /* got an arg so process it */
352 HOSTNAME:
353 did_flags |= (mask & (A_NETMASK|A_HOSTNAME));
354 if (mask & A_CAST_HOST_COPY) {
355#if ENABLE_FEATURE_IFCONFIG_HW
356 if (mask & A_CAST_RESOLVE) {
357#endif
358#if ENABLE_FEATURE_IPV6
359 char *prefix;
360 int prefix_len = 0;
361#endif
362 /*safe_strncpy(host, *argv, (sizeof host));*/
363 host = *argv;
364#if ENABLE_FEATURE_IPV6
365 prefix = strchr(host, '/');
366 if (prefix) {
367 prefix_len = xatou_range(prefix + 1, 0, 128);
368 *prefix = '\0';
369 }
370#endif
371 sai.sin_family = AF_INET;
372 sai.sin_port = 0;
373 if (strcmp(host, "default") == 0) {
374 /* Default is special, meaning 0.0.0.0. */
375 sai.sin_addr.s_addr = INADDR_ANY;
376 }
377#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
378 else if ((host[0] == '+' && !host[1]) && (mask & A_BROADCAST)
379 && (did_flags & (A_NETMASK|A_HOSTNAME)) == (A_NETMASK|A_HOSTNAME)
380 ) {
381 /* + is special, meaning broadcast is derived. */
382 sai.sin_addr.s_addr = (~sai_netmask) | (sai_hostname & sai_netmask);
383 }
384#endif
385 else {
386 len_and_sockaddr *lsa;
387 if (strcmp(host, "inet") == 0)
388 continue; /* compat stuff */
389 lsa = xhost2sockaddr(host, 0);
390#if ENABLE_FEATURE_IPV6
391 if (lsa->u.sa.sa_family == AF_INET6) {
392 int sockfd6;
393 struct in6_ifreq ifr6;
394
395 memcpy((char *) &ifr6.ifr6_addr,
396 (char *) &(lsa->u.sin6.sin6_addr),
397 sizeof(struct in6_addr));
398
399 /* Create a channel to the NET kernel. */
400 sockfd6 = xsocket(AF_INET6, SOCK_DGRAM, 0);
401 xioctl(sockfd6, SIOGIFINDEX, &ifr);
402 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
403 ifr6.ifr6_prefixlen = prefix_len;
404 ioctl_or_perror_and_die(sockfd6, a1op->selector, &ifr6, "SIOC%s", a1op->name);
405 if (ENABLE_FEATURE_CLEAN_UP)
406 free(lsa);
407 continue;
408 }
409#endif
410 sai.sin_addr = lsa->u.sin.sin_addr;
411 if (ENABLE_FEATURE_CLEAN_UP)
412 free(lsa);
413 }
414#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
415 if (mask & A_HOSTNAME)
416 sai_hostname = sai.sin_addr.s_addr;
417 if (mask & A_NETMASK)
418 sai_netmask = sai.sin_addr.s_addr;
419#endif
420 p = (char *) &sai;
421#if ENABLE_FEATURE_IFCONFIG_HW
422 } else { /* A_CAST_HOST_COPY_IN_ETHER */
423 /* This is the "hw" arg case. */
424 smalluint hw_class= index_in_substrings("ether\0"
425 IF_FEATURE_HWIB("infiniband\0"), *argv) + 1;
426 if (!hw_class || !*++argv)
427 bb_show_usage();
428 /*safe_strncpy(host, *argv, sizeof(host));*/
429 host = *argv;
430 if (hw_class == 1 ? in_ether(host, &sa) : in_ib(host, &sa))
431 bb_error_msg_and_die("invalid hw-addr %s", host);
432 p = (char *) &sa;
433 }
434#endif
435 memcpy( (((char *)&ifr) + a1op->ifr_offset),
436 p, sizeof(struct sockaddr));
437 } else {
438 /* FIXME: error check?? */
439 unsigned long i = strtoul(*argv, NULL, 0);
440 p = ((char *)&ifr) + a1op->ifr_offset;
441#if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
442 if (mask & A_MAP_TYPE) {
443 xioctl(sockfd, SIOCGIFMAP, &ifr);
444 if ((mask & A_MAP_UCHAR) == A_MAP_UCHAR)
445 *((unsigned char *) p) = i;
446 else if (mask & A_MAP_USHORT)
447 *((unsigned short *) p) = i;
448 else
449 *((unsigned long *) p) = i;
450 } else
451#endif
452 if (mask & A_CAST_CHAR_PTR)
453 *((caddr_t *) p) = (caddr_t) i;
454 else /* A_CAST_INT */
455 *((int *) p) = i;
456 }
457
458 ioctl_or_perror_and_die(sockfd, a1op->selector, &ifr, "SIOC%s", a1op->name);
459#ifdef QUESTIONABLE_ALIAS_CASE
460 if (mask & A_COLON_CHK) {
461 /*
462 * Don't do the set_flag() if the address is an alias with
463 * a '-' at the end, since it's deleted already! - Roman
464 *
465 * Should really use regex.h here, not sure though how well
466 * it'll go with the cross-platform support etc.
467 */
468 char *ptr;
469 short int found_colon = 0;
470 for (ptr = ifr.ifr_name; *ptr; ptr++)
471 if (*ptr == ':')
472 found_colon++;
473 if (found_colon && ptr[-1] == '-')
474 continue;
475 }
476#endif
477 }
478 if (!(mask & A_SET_AFTER))
479 continue;
480 mask = N_SET;
481 }
482
483 xioctl(sockfd, SIOCGIFFLAGS, &ifr);
484 selector = op->selector;
485 if (mask & SET_MASK)
486 ifr.ifr_flags |= selector;
487 else
488 ifr.ifr_flags &= ~selector;
489 xioctl(sockfd, SIOCSIFFLAGS, &ifr);
490 } /* while () */
491
492 if (ENABLE_FEATURE_CLEAN_UP)
493 close(sockfd);
494 return 0;
495}
496
497#if ENABLE_FEATURE_IFCONFIG_HW
498/* Input an Ethernet address and convert to binary. */
499static int in_ether(const char *bufp, struct sockaddr *sap)
500{
501 char *ptr;
502 int i, j;
503 unsigned char val;
504 unsigned char c;
505
506 sap->sa_family = ARPHRD_ETHER;
507 ptr = (char *) sap->sa_data;
508
509 i = 0;
510 do {
511 j = val = 0;
512
513 /* We might get a semicolon here - not required. */
514 if (i && (*bufp == ':')) {
515 bufp++;
516 }
517
518 do {
519 c = *bufp;
520 if (((unsigned char)(c - '0')) <= 9) {
521 c -= '0';
522 } else if (((unsigned char)((c|0x20) - 'a')) <= 5) {
523 c = (c|0x20) - ('a'-10);
524 } else if (j && (c == ':' || c == 0)) {
525 break;
526 } else {
527 return -1;
528 }
529 ++bufp;
530 val <<= 4;
531 val += c;
532 } while (++j < 2);
533 *ptr++ = val;
534 } while (++i < ETH_ALEN);
535
536 return *bufp; /* Error if we don't end at end of string. */
537}
538#endif
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