source: MondoRescue/branches/3.3/mindi-busybox/networking/ifconfig.c@ 3621

Last change on this file since 3621 was 3621, checked in by Bruno Cornec, 7 years ago

New 3?3 banch for incorporation of latest busybox 1.25. Changing minor version to handle potential incompatibilities.
File size: 15.6 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//usage:#define ifconfig_trivial_usage
30//usage: IF_FEATURE_IFCONFIG_STATUS("[-a]") " interface [address]"
31//usage:#define ifconfig_full_usage "\n\n"
32//usage: "Configure a network interface\n"
33//usage: "\n"
34//usage: IF_FEATURE_IPV6(
35//usage: " [add ADDRESS[/PREFIXLEN]]\n")
36//usage: IF_FEATURE_IPV6(
37//usage: " [del ADDRESS[/PREFIXLEN]]\n")
38//usage: " [[-]broadcast [ADDRESS]] [[-]pointopoint [ADDRESS]]\n"
39//usage: " [netmask ADDRESS] [dstaddr ADDRESS]\n"
40//usage: IF_FEATURE_IFCONFIG_SLIP(
41//usage: " [outfill NN] [keepalive NN]\n")
42//usage: " " IF_FEATURE_IFCONFIG_HW("[hw ether" IF_FEATURE_HWIB("|infiniband")" ADDRESS] ") "[metric NN] [mtu NN]\n"
43//usage: " [[-]trailers] [[-]arp] [[-]allmulti]\n"
44//usage: " [multicast] [[-]promisc] [txqueuelen NN] [[-]dynamic]\n"
45//usage: IF_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ(
46//usage: " [mem_start NN] [io_addr NN] [irq NN]\n")
47//usage: " [up|down] ..."
48
49#include "libbb.h"
50#include "inet_common.h"
51#include <net/if.h>
52#include <net/if_arp.h>
53#include <netinet/in.h>
54#ifdef HAVE_NET_ETHERNET_H
55# include <net/ethernet.h>
56#endif
57
58#if ENABLE_FEATURE_IFCONFIG_SLIP
59# include <linux/if_slip.h>
60#endif
61
62/* I don't know if this is needed for busybox or not. Anyone? */
63#define QUESTIONABLE_ALIAS_CASE
64
65
66/* Defines for glibc2.0 users. */
67#ifndef SIOCSIFTXQLEN
68# define SIOCSIFTXQLEN 0x8943
69# define SIOCGIFTXQLEN 0x8942
70#endif
71
72/* ifr_qlen is ifru_ivalue, but it isn't present in 2.0 kernel headers */
73#ifndef ifr_qlen
74# define ifr_qlen ifr_ifru.ifru_mtu
75#endif
76
77#ifndef IFF_DYNAMIC
78# define IFF_DYNAMIC 0x8000 /* dialup device with changing addresses */
79#endif
80
81#if ENABLE_FEATURE_IPV6
82struct in6_ifreq {
83 struct in6_addr ifr6_addr;
84 uint32_t ifr6_prefixlen;
85 int ifr6_ifindex;
86};
87#endif
88
89/*
90 * Here are the bit masks for the "flags" member of struct options below.
91 * N_ signifies no arg prefix; M_ signifies arg prefixed by '-'.
92 * CLR clears the flag; SET sets the flag; ARG signifies (optional) arg.
93 */
94#define N_CLR 0x01
95#define M_CLR 0x02
96#define N_SET 0x04
97#define M_SET 0x08
98#define N_ARG 0x10
99#define M_ARG 0x20
100
101#define M_MASK (M_CLR | M_SET | M_ARG)
102#define N_MASK (N_CLR | N_SET | N_ARG)
103#define SET_MASK (N_SET | M_SET)
104#define CLR_MASK (N_CLR | M_CLR)
105#define SET_CLR_MASK (SET_MASK | CLR_MASK)
106#define ARG_MASK (M_ARG | N_ARG)
107
108/*
109 * Here are the bit masks for the "arg_flags" member of struct options below.
110 */
111
112/*
113 * cast type:
114 * 00 int
115 * 01 char *
116 * 02 HOST_COPY in_ether
117 * 03 HOST_COPY INET_resolve
118 */
119#define A_CAST_TYPE 0x03
120/*
121 * map type:
122 * 00 not a map type (mem_start, io_addr, irq)
123 * 04 memstart (unsigned long)
124 * 08 io_addr (unsigned short)
125 * 0C irq (unsigned char)
126 */
127#define A_MAP_TYPE 0x0C
128#define A_ARG_REQ 0x10 /* Set if an arg is required. */
129#define A_NETMASK 0x20 /* Set if netmask (check for multiple sets). */
130#define A_SET_AFTER 0x40 /* Set a flag at the end. */
131#define A_COLON_CHK 0x80 /* Is this needed? See below. */
132#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
133#define A_HOSTNAME 0x100 /* Set if it is ip addr. */
134#define A_BROADCAST 0x200 /* Set if it is broadcast addr. */
135#else
136#define A_HOSTNAME 0
137#define A_BROADCAST 0
138#endif
139
140/*
141 * These defines are for dealing with the A_CAST_TYPE field.
142 */
143#define A_CAST_CHAR_PTR 0x01
144#define A_CAST_RESOLVE 0x01
145#define A_CAST_HOST_COPY 0x02
146#define A_CAST_HOST_COPY_IN_ETHER A_CAST_HOST_COPY
147#define A_CAST_HOST_COPY_RESOLVE (A_CAST_HOST_COPY | A_CAST_RESOLVE)
148
149/*
150 * These defines are for dealing with the A_MAP_TYPE field.
151 */
152#define A_MAP_ULONG 0x04 /* memstart */
153#define A_MAP_USHORT 0x08 /* io_addr */
154#define A_MAP_UCHAR 0x0C /* irq */
155
156/*
157 * Define the bit masks signifying which operations to perform for each arg.
158 */
159
160#define ARG_METRIC (A_ARG_REQ /*| A_CAST_INT*/)
161#define ARG_MTU (A_ARG_REQ /*| A_CAST_INT*/)
162#define ARG_TXQUEUELEN (A_ARG_REQ /*| A_CAST_INT*/)
163#define ARG_MEM_START (A_ARG_REQ | A_MAP_ULONG)
164#define ARG_IO_ADDR (A_ARG_REQ | A_MAP_ULONG)
165#define ARG_IRQ (A_ARG_REQ | A_MAP_UCHAR)
166#define ARG_DSTADDR (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE)
167#define ARG_NETMASK (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_NETMASK)
168#define ARG_BROADCAST (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_BROADCAST)
169#define ARG_HW (A_ARG_REQ | A_CAST_HOST_COPY_IN_ETHER)
170#define ARG_POINTOPOINT (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
171#define ARG_KEEPALIVE (A_ARG_REQ | A_CAST_CHAR_PTR)
172#define ARG_OUTFILL (A_ARG_REQ | A_CAST_CHAR_PTR)
173#define ARG_HOSTNAME (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_COLON_CHK | A_HOSTNAME)
174#define ARG_ADD_DEL (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
175
176
177struct arg1opt {
178 const char *name;
179 unsigned short selector;
180 unsigned short ifr_offset;
181};
182
183struct options {
184 const char *name;
185#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
186 const unsigned int flags:6;
187 const unsigned int arg_flags:10;
188#else
189 const unsigned char flags;
190 const unsigned char arg_flags;
191#endif
192 const unsigned short selector;
193};
194
195#define ifreq_offsetof(x) offsetof(struct ifreq, x)
196
197/*
198 * Set up the tables. Warning! They must have corresponding order!
199 */
200
201static const struct arg1opt Arg1Opt[] = {
202 { "SIFMETRIC", SIOCSIFMETRIC, ifreq_offsetof(ifr_metric) },
203 { "SIFMTU", SIOCSIFMTU, ifreq_offsetof(ifr_mtu) },
204 { "SIFTXQLEN", SIOCSIFTXQLEN, ifreq_offsetof(ifr_qlen) },
205 { "SIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr) },
206 { "SIFNETMASK", SIOCSIFNETMASK, ifreq_offsetof(ifr_netmask) },
207 { "SIFBRDADDR", SIOCSIFBRDADDR, ifreq_offsetof(ifr_broadaddr) },
208#if ENABLE_FEATURE_IFCONFIG_HW
209 { "SIFHWADDR", SIOCSIFHWADDR, ifreq_offsetof(ifr_hwaddr) },
210#endif
211 { "SIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr) },
212#ifdef SIOCSKEEPALIVE
213 { "SKEEPALIVE", SIOCSKEEPALIVE, ifreq_offsetof(ifr_data) },
214#endif
215#ifdef SIOCSOUTFILL
216 { "SOUTFILL", SIOCSOUTFILL, ifreq_offsetof(ifr_data) },
217#endif
218#if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
219 { "SIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.mem_start) },
220 { "SIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.base_addr) },
221 { "SIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.irq) },
222#endif
223#if ENABLE_FEATURE_IPV6
224 { "SIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr) }, /* IPv6 version ignores the offset */
225 { "DIFADDR", SIOCDIFADDR, ifreq_offsetof(ifr_addr) }, /* IPv6 version ignores the offset */
226#endif
227 /* Last entry is for unmatched (assumed to be hostname/address) arg. */
228 { "SIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr) },
229};
230
231static const struct options OptArray[] = {
232 { "metric", N_ARG, ARG_METRIC, 0 },
233 { "mtu", N_ARG, ARG_MTU, 0 },
234 { "txqueuelen", N_ARG, ARG_TXQUEUELEN, 0 },
235 { "dstaddr", N_ARG, ARG_DSTADDR, 0 },
236 { "netmask", N_ARG, ARG_NETMASK, 0 },
237 { "broadcast", N_ARG | M_CLR, ARG_BROADCAST, IFF_BROADCAST },
238#if ENABLE_FEATURE_IFCONFIG_HW
239 { "hw", N_ARG, ARG_HW, 0 },
240#endif
241 { "pointopoint", N_ARG | M_CLR, ARG_POINTOPOINT, IFF_POINTOPOINT },
242#ifdef SIOCSKEEPALIVE
243 { "keepalive", N_ARG, ARG_KEEPALIVE, 0 },
244#endif
245#ifdef SIOCSOUTFILL
246 { "outfill", N_ARG, ARG_OUTFILL, 0 },
247#endif
248#if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
249 { "mem_start", N_ARG, ARG_MEM_START, 0 },
250 { "io_addr", N_ARG, ARG_IO_ADDR, 0 },
251 { "irq", N_ARG, ARG_IRQ, 0 },
252#endif
253#if ENABLE_FEATURE_IPV6
254 { "add", N_ARG, ARG_ADD_DEL, 0 },
255 { "del", N_ARG, ARG_ADD_DEL, 0 },
256#endif
257 { "arp", N_CLR | M_SET, 0, IFF_NOARP },
258 { "trailers", N_CLR | M_SET, 0, IFF_NOTRAILERS },
259 { "promisc", N_SET | M_CLR, 0, IFF_PROMISC },
260 { "multicast", N_SET | M_CLR, 0, IFF_MULTICAST },
261 { "allmulti", N_SET | M_CLR, 0, IFF_ALLMULTI },
262 { "dynamic", N_SET | M_CLR, 0, IFF_DYNAMIC },
263 { "up", N_SET, 0, (IFF_UP | IFF_RUNNING) },
264 { "down", N_CLR, 0, IFF_UP },
265 { NULL, 0, ARG_HOSTNAME, (IFF_UP | IFF_RUNNING) }
266};
267
268int ifconfig_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
269int ifconfig_main(int argc UNUSED_PARAM, char **argv)
270{
271 struct ifreq ifr;
272 struct sockaddr_in sai;
273#if ENABLE_FEATURE_IFCONFIG_HW
274 struct sockaddr sa;
275#endif
276 const struct arg1opt *a1op;
277 const struct options *op;
278 int sockfd; /* socket fd we use to manipulate stuff with */
279 int selector;
280#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
281 unsigned int mask;
282 unsigned int did_flags;
283 unsigned int sai_hostname, sai_netmask;
284#else
285 unsigned char mask;
286 unsigned char did_flags;
287#endif
288 char *p;
289 /*char host[128];*/
290 const char *host = NULL; /* make gcc happy */
291
292 did_flags = 0;
293#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
294 sai_hostname = 0;
295 sai_netmask = 0;
296#endif
297
298 /* skip argv[0] */
299 ++argv;
300
301#if ENABLE_FEATURE_IFCONFIG_STATUS
302 if (argv[0] && (argv[0][0] == '-' && argv[0][1] == 'a' && !argv[0][2])) {
303 interface_opt_a = 1;
304 ++argv;
305 }
306#endif
307
308 if (!argv[0] || !argv[1]) { /* one or no args */
309#if ENABLE_FEATURE_IFCONFIG_STATUS
310 return display_interfaces(argv[0] /* can be NULL */);
311#else
312 bb_error_msg_and_die("no support for status display");
313#endif
314 }
315
316 /* Create a channel to the NET kernel. */
317 sockfd = xsocket(AF_INET, SOCK_DGRAM, 0);
318
319 /* get interface name */
320 strncpy_IFNAMSIZ(ifr.ifr_name, *argv);
321
322 /* Process the remaining arguments. */
323 while (*++argv != NULL) {
324 p = *argv;
325 mask = N_MASK;
326 if (*p == '-') { /* If the arg starts with '-'... */
327 ++p; /* advance past it and */
328 mask = M_MASK; /* set the appropriate mask. */
329 }
330 for (op = OptArray; op->name; op++) { /* Find table entry. */
331 if (strcmp(p, op->name) == 0) { /* If name matches... */
332 mask &= op->flags;
333 if (mask) /* set the mask and go. */
334 goto FOUND_ARG;
335 /* If we get here, there was a valid arg with an */
336 /* invalid '-' prefix. */
337 bb_error_msg_and_die("bad: '%s'", p-1);
338 }
339 }
340
341 /* We fell through, so treat as possible hostname. */
342 a1op = Arg1Opt + ARRAY_SIZE(Arg1Opt) - 1;
343 mask = op->arg_flags;
344 goto HOSTNAME;
345
346 FOUND_ARG:
347 if (mask & ARG_MASK) {
348 mask = op->arg_flags;
349 if (mask & A_NETMASK & did_flags)
350 bb_show_usage();
351 a1op = Arg1Opt + (op - OptArray);
352 if (*++argv == NULL) {
353 if (mask & A_ARG_REQ)
354 bb_show_usage();
355 --argv;
356 mask &= A_SET_AFTER; /* just for broadcast */
357 } else { /* got an arg so process it */
358 HOSTNAME:
359 did_flags |= (mask & (A_NETMASK|A_HOSTNAME));
360 if (mask & A_CAST_HOST_COPY) {
361#if ENABLE_FEATURE_IFCONFIG_HW
362 if (mask & A_CAST_RESOLVE) {
363#endif
364 host = *argv;
365 if (strcmp(host, "inet") == 0)
366 continue; /* compat stuff */
367 sai.sin_family = AF_INET;
368 sai.sin_port = 0;
369 if (strcmp(host, "default") == 0) {
370 /* Default is special, meaning 0.0.0.0. */
371 sai.sin_addr.s_addr = INADDR_ANY;
372 }
373#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
374 else if ((host[0] == '+' && !host[1])
375 && (mask & A_BROADCAST)
376 && (did_flags & (A_NETMASK|A_HOSTNAME)) == (A_NETMASK|A_HOSTNAME)
377 ) {
378 /* + is special, meaning broadcast is derived. */
379 sai.sin_addr.s_addr = (~sai_netmask) | (sai_hostname & sai_netmask);
380 }
381#endif
382 else {
383 len_and_sockaddr *lsa;
384#if ENABLE_FEATURE_IPV6
385 char *prefix;
386 int prefix_len = 0;
387 prefix = strchr(host, '/');
388 if (prefix) {
389 prefix_len = xatou_range(prefix + 1, 0, 128);
390 *prefix = '\0';
391 }
392 resolve:
393#endif
394 lsa = xhost2sockaddr(host, 0);
395#if ENABLE_FEATURE_IPV6
396 if (lsa->u.sa.sa_family != AF_INET6 && prefix) {
397/* TODO: we do not support "ifconfig eth0 up 1.2.3.4/17".
398 * For now, just make it fail instead of silently ignoring "/17" part:
399 */
400 *prefix = '/';
401 goto resolve;
402 }
403 if (lsa->u.sa.sa_family == AF_INET6) {
404 int sockfd6;
405 struct in6_ifreq ifr6;
406
407 sockfd6 = xsocket(AF_INET6, SOCK_DGRAM, 0);
408 xioctl(sockfd6, SIOCGIFINDEX, &ifr);
409 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
410 ifr6.ifr6_prefixlen = prefix_len;
411 memcpy(&ifr6.ifr6_addr,
412 &lsa->u.sin6.sin6_addr,
413 sizeof(struct in6_addr));
414 ioctl_or_perror_and_die(sockfd6, a1op->selector, &ifr6, "SIOC%s", a1op->name);
415 if (ENABLE_FEATURE_CLEAN_UP)
416 free(lsa);
417 continue;
418 }
419#endif
420 sai.sin_addr = lsa->u.sin.sin_addr;
421 if (ENABLE_FEATURE_CLEAN_UP)
422 free(lsa);
423 }
424#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
425 if (mask & A_HOSTNAME)
426 sai_hostname = sai.sin_addr.s_addr;
427 if (mask & A_NETMASK)
428 sai_netmask = sai.sin_addr.s_addr;
429#endif
430 p = (char *) &sai;
431#if ENABLE_FEATURE_IFCONFIG_HW
432 } else { /* A_CAST_HOST_COPY_IN_ETHER */
433 /* This is the "hw" arg case. */
434 smalluint hw_class = index_in_substrings("ether\0"
435 IF_FEATURE_HWIB("infiniband\0"), *argv) + 1;
436 if (!hw_class || !*++argv)
437 bb_show_usage();
438 host = *argv;
439 if (hw_class == 1 ? in_ether(host, &sa) : in_ib(host, &sa))
440 bb_error_msg_and_die("invalid hw-addr %s", host);
441 p = (char *) &sa;
442 }
443#endif
444 memcpy( ((char *)&ifr) + a1op->ifr_offset,
445 p, sizeof(struct sockaddr));
446 } else {
447 /* FIXME: error check?? */
448 unsigned long i = strtoul(*argv, NULL, 0);
449 p = ((char *)&ifr) + a1op->ifr_offset;
450#if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
451 if (mask & A_MAP_TYPE) {
452 xioctl(sockfd, SIOCGIFMAP, &ifr);
453 if ((mask & A_MAP_UCHAR) == A_MAP_UCHAR)
454 *(unsigned char *) p = i;
455 else if (mask & A_MAP_USHORT)
456 *(unsigned short *) p = i;
457 else
458 *(unsigned long *) p = i;
459 } else
460#endif
461 if (mask & A_CAST_CHAR_PTR)
462 *(caddr_t *) p = (caddr_t) i;
463 else /* A_CAST_INT */
464 *(int *) p = i;
465 }
466
467 ioctl_or_perror_and_die(sockfd, a1op->selector, &ifr, "SIOC%s", a1op->name);
468#ifdef QUESTIONABLE_ALIAS_CASE
469 if (mask & A_COLON_CHK) {
470 /*
471 * Don't do the set_flag() if the address is an alias with
472 * a '-' at the end, since it's deleted already! - Roman
473 *
474 * Should really use regex.h here, not sure though how well
475 * it'll go with the cross-platform support etc.
476 */
477 char *ptr;
478 short int found_colon = 0;
479 for (ptr = ifr.ifr_name; *ptr; ptr++)
480 if (*ptr == ':')
481 found_colon++;
482 if (found_colon && ptr[-1] == '-')
483 continue;
484 }
485#endif
486 }
487 if (!(mask & A_SET_AFTER))
488 continue;
489 mask = N_SET;
490 } /* if (mask & ARG_MASK) */
491
492 xioctl(sockfd, SIOCGIFFLAGS, &ifr);
493 selector = op->selector;
494 if (mask & SET_MASK)
495 ifr.ifr_flags |= selector;
496 else
497 ifr.ifr_flags &= ~selector;
498 xioctl(sockfd, SIOCSIFFLAGS, &ifr);
499 } /* while () */
500
501 if (ENABLE_FEATURE_CLEAN_UP)
502 close(sockfd);
503 return 0;
504}
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