3 * Similar to the standard Unix ifconfig, but with only the necessary
4 * parts for AF_INET, and without any printing of if info (for now).
6 * Bjorn Wesen, Axis Communications AB
9 * Authors of the original ifconfig was:
10 * Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
12 * This program is free software; you can redistribute it
13 * and/or modify it under the terms of the GNU General
14 * Public License as published by the Free Software
15 * Foundation; either version 2 of the License, or (at
16 * your option) any later version.
18 * $Id: ifconfig.c,v 1.21 2002/12/27 17:42:01 mjn3 Exp $
23 * Heavily modified by Manuel Novoa III Mar 6, 2001
25 * From initial port to busybox, removed most of the redundancy by
26 * converting to a table-driven approach. Added several (optional)
27 * args missing from initial port.
29 * Still missing: media, tunnel.
32 * IPV6 support added by Bart Visscher <magick@linux-fan.com>
37 #include <string.h> /* strcmp and friends */
38 #include <ctype.h> /* isdigit and friends */
39 #include <stddef.h> /* offsetof */
40 #include <sys/ioctl.h>
41 #include <net/if_arp.h>
42 #include <netinet/in.h>
43 #include <linux/if_ether.h>
45 #include "inet_common.h"
48 #ifdef CONFIG_FEATURE_IFCONFIG_SLIP
49 # include <linux/if_slip.h>
52 /* I don't know if this is needed for busybox or not. Anyone? */
53 #define QUESTIONABLE_ALIAS_CASE
56 /* Defines for glibc2.0 users. */
58 # define SIOCSIFTXQLEN 0x8943
59 # define SIOCGIFTXQLEN 0x8942
62 /* ifr_qlen is ifru_ivalue, but it isn't present in 2.0 kernel headers */
64 # define ifr_qlen ifr_ifru.ifru_mtu
68 # define IFF_DYNAMIC 0x8000 /* dialup device with changing addresses */
71 #ifdef CONFIG_FEATURE_IPV6
73 struct in6_addr ifr6_addr;
74 uint32_t ifr6_prefixlen;
80 * Here are the bit masks for the "flags" member of struct options below.
81 * N_ signifies no arg prefix; M_ signifies arg prefixed by '-'.
82 * CLR clears the flag; SET sets the flag; ARG signifies (optional) arg.
91 #define M_MASK (M_CLR | M_SET | M_ARG)
92 #define N_MASK (N_CLR | N_SET | N_ARG)
93 #define SET_MASK (N_SET | M_SET)
94 #define CLR_MASK (N_CLR | M_CLR)
95 #define SET_CLR_MASK (SET_MASK | CLR_MASK)
96 #define ARG_MASK (M_ARG | N_ARG)
99 * Here are the bit masks for the "arg_flags" member of struct options below.
106 * 02 HOST_COPY in_ether
107 * 03 HOST_COPY INET_resolve
109 #define A_CAST_TYPE 0x03
112 * 00 not a map type (mem_start, io_addr, irq)
113 * 04 memstart (unsigned long)
114 * 08 io_addr (unsigned short)
115 * 0C irq (unsigned char)
117 #define A_MAP_TYPE 0x0C
118 #define A_ARG_REQ 0x10 /* Set if an arg is required. */
119 #define A_NETMASK 0x20 /* Set if netmask (check for multiple sets). */
120 #define A_SET_AFTER 0x40 /* Set a flag at the end. */
121 #define A_COLON_CHK 0x80 /* Is this needed? See below. */
122 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
123 #define A_HOSTNAME 0x100 /* Set if it is ip addr. */
124 #define A_BROADCAST 0x200 /* Set if it is broadcast addr. */
127 #define A_BROADCAST 0
131 * These defines are for dealing with the A_CAST_TYPE field.
133 #define A_CAST_CHAR_PTR 0x01
134 #define A_CAST_RESOLVE 0x01
135 #define A_CAST_HOST_COPY 0x02
136 #define A_CAST_HOST_COPY_IN_ETHER A_CAST_HOST_COPY
137 #define A_CAST_HOST_COPY_RESOLVE (A_CAST_HOST_COPY | A_CAST_RESOLVE)
140 * These defines are for dealing with the A_MAP_TYPE field.
142 #define A_MAP_ULONG 0x04 /* memstart */
143 #define A_MAP_USHORT 0x08 /* io_addr */
144 #define A_MAP_UCHAR 0x0C /* irq */
147 * Define the bit masks signifying which operations to perform for each arg.
150 #define ARG_METRIC (A_ARG_REQ /*| A_CAST_INT*/)
151 #define ARG_MTU (A_ARG_REQ /*| A_CAST_INT*/)
152 #define ARG_TXQUEUELEN (A_ARG_REQ /*| A_CAST_INT*/)
153 #define ARG_MEM_START (A_ARG_REQ | A_MAP_ULONG)
154 #define ARG_IO_ADDR (A_ARG_REQ | A_MAP_ULONG)
155 #define ARG_IRQ (A_ARG_REQ | A_MAP_UCHAR)
156 #define ARG_DSTADDR (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE)
157 #define ARG_NETMASK (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_NETMASK)
158 #define ARG_BROADCAST (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_BROADCAST)
159 #define ARG_HW (A_ARG_REQ | A_CAST_HOST_COPY_IN_ETHER)
160 #define ARG_POINTOPOINT (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
161 #define ARG_KEEPALIVE (A_ARG_REQ | A_CAST_CHAR_PTR)
162 #define ARG_OUTFILL (A_ARG_REQ | A_CAST_CHAR_PTR)
163 #define ARG_HOSTNAME (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_COLON_CHK | A_HOSTNAME)
164 #define ARG_ADD_DEL (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
168 * Set up the tables. Warning! They must have corresponding order!
173 unsigned short selector;
174 unsigned short ifr_offset;
179 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
180 const unsigned int flags:6;
181 const unsigned int arg_flags:10;
183 const unsigned char flags;
184 const unsigned char arg_flags;
186 const unsigned short selector;
189 #define ifreq_offsetof(x) offsetof(struct ifreq, x)
191 static const struct arg1opt Arg1Opt[] = {
192 {"SIOCSIFMETRIC", SIOCSIFMETRIC, ifreq_offsetof(ifr_metric)},
193 {"SIOCSIFMTU", SIOCSIFMTU, ifreq_offsetof(ifr_mtu)},
194 {"SIOCSIFTXQLEN", SIOCSIFTXQLEN, ifreq_offsetof(ifr_qlen)},
195 {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
196 {"SIOCSIFNETMASK", SIOCSIFNETMASK, ifreq_offsetof(ifr_netmask)},
197 {"SIOCSIFBRDADDR", SIOCSIFBRDADDR, ifreq_offsetof(ifr_broadaddr)},
198 #ifdef CONFIG_FEATURE_IFCONFIG_HW
199 {"SIOCSIFHWADDR", SIOCSIFHWADDR, ifreq_offsetof(ifr_hwaddr)},
201 {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
202 #ifdef SIOCSKEEPALIVE
203 {"SIOCSKEEPALIVE", SIOCSKEEPALIVE, ifreq_offsetof(ifr_data)},
206 {"SIOCSOUTFILL", SIOCSOUTFILL, ifreq_offsetof(ifr_data)},
208 #ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
209 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.mem_start)},
210 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.base_addr)},
211 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.irq)},
213 /* Last entry if for unmatched (possibly hostname) arg. */
214 #ifdef CONFIG_FEATURE_IPV6
215 {"SIOCSIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
216 {"SIOCDIFADDR", SIOCDIFADDR, ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
218 {"SIOCSIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr)},
221 static const struct options OptArray[] = {
222 {"metric", N_ARG, ARG_METRIC, 0},
223 {"mtu", N_ARG, ARG_MTU, 0},
224 {"txqueuelen", N_ARG, ARG_TXQUEUELEN, 0},
225 {"dstaddr", N_ARG, ARG_DSTADDR, 0},
226 {"netmask", N_ARG, ARG_NETMASK, 0},
227 {"broadcast", N_ARG | M_CLR, ARG_BROADCAST, IFF_BROADCAST},
228 #ifdef CONFIG_FEATURE_IFCONFIG_HW
229 {"hw", N_ARG, ARG_HW, 0},
231 {"pointopoint", N_ARG | M_CLR, ARG_POINTOPOINT, IFF_POINTOPOINT},
232 #ifdef SIOCSKEEPALIVE
233 {"keepalive", N_ARG, ARG_KEEPALIVE, 0},
236 {"outfill", N_ARG, ARG_OUTFILL, 0},
238 #ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
239 {"mem_start", N_ARG, ARG_MEM_START, 0},
240 {"io_addr", N_ARG, ARG_IO_ADDR, 0},
241 {"irq", N_ARG, ARG_IRQ, 0},
243 #ifdef CONFIG_FEATURE_IPV6
244 {"add", N_ARG, ARG_ADD_DEL, 0},
245 {"del", N_ARG, ARG_ADD_DEL, 0},
247 {"arp", N_CLR | M_SET, 0, IFF_NOARP},
248 {"trailers", N_CLR | M_SET, 0, IFF_NOTRAILERS},
249 {"promisc", N_SET | M_CLR, 0, IFF_PROMISC},
250 {"multicast", N_SET | M_CLR, 0, IFF_MULTICAST},
251 {"allmulti", N_SET | M_CLR, 0, IFF_ALLMULTI},
252 {"dynamic", N_SET | M_CLR, 0, IFF_DYNAMIC},
253 {"up", N_SET, 0, (IFF_UP | IFF_RUNNING)},
254 {"down", N_CLR, 0, IFF_UP},
255 {NULL, 0, ARG_HOSTNAME, (IFF_UP | IFF_RUNNING)}
259 * A couple of prototypes.
262 #ifdef CONFIG_FEATURE_IFCONFIG_HW
263 static int in_ether(char *bufp, struct sockaddr *sap);
266 #ifdef CONFIG_FEATURE_IFCONFIG_STATUS
267 extern int interface_opt_a;
268 extern int display_interfaces(char *ifname);
275 int ifconfig_main(int argc, char **argv)
278 struct sockaddr_in sai;
279 #ifdef CONFIG_FEATURE_IPV6
280 struct sockaddr_in6 sai6;
282 #ifdef CONFIG_FEATURE_IFCONFIG_HW
285 const struct arg1opt *a1op;
286 const struct options *op;
287 int sockfd; /* socket fd we use to manipulate stuff with */
290 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
292 unsigned int did_flags;
293 in_addr_t sai_hostname, sai_netmask;
296 unsigned char did_flags;
308 #ifdef CONFIG_FEATURE_IFCONFIG_STATUS
309 if ((argc > 0) && (((*argv)[0] == '-') && ((*argv)[1] == 'a') && !(*argv)[2])) {
317 #ifdef CONFIG_FEATURE_IFCONFIG_STATUS
318 return display_interfaces(argc ? *argv : NULL);
321 ("ifconfig was not compiled with interface status display support.");
325 /* Create a channel to the NET kernel. */
326 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
327 perror_msg_and_die("socket");
330 /* get interface name */
331 safe_strncpy(ifr.ifr_name, *argv, IFNAMSIZ);
333 /* Process the remaining arguments. */
334 while (*++argv != (char *) NULL) {
337 if (*p == '-') { /* If the arg starts with '-'... */
338 ++p; /* advance past it and */
339 mask = M_MASK; /* set the appropriate mask. */
341 for (op = OptArray; op->name; op++) { /* Find table entry. */
342 if (strcmp(p, op->name) == 0) { /* If name matches... */
343 if ((mask &= op->flags)) { /* set the mask and go. */
346 /* If we get here, there was a valid arg with an */
347 /* invalid '-' prefix. */
353 /* We fell through, so treat as possible hostname. */
354 a1op = Arg1Opt + (sizeof(Arg1Opt) / sizeof(Arg1Opt[0])) - 1;
355 mask = op->arg_flags;
359 if (mask & ARG_MASK) {
360 mask = op->arg_flags;
361 a1op = Arg1Opt + (op - OptArray);
362 if (mask & A_NETMASK & did_flags) {
365 if (*++argv == NULL) {
366 if (mask & A_ARG_REQ) {
370 mask &= A_SET_AFTER; /* just for broadcast */
372 } else { /* got an arg so process it */
374 did_flags |= (mask & (A_NETMASK|A_HOSTNAME));
375 if (mask & A_CAST_HOST_COPY) {
376 #ifdef CONFIG_FEATURE_IFCONFIG_HW
377 if (mask & A_CAST_RESOLVE) {
379 #ifdef CONFIG_FEATURE_IPV6
384 safe_strncpy(host, *argv, (sizeof host));
385 #ifdef CONFIG_FEATURE_IPV6
386 if ((prefix = strchr(host, '/'))) {
387 prefix_len = atol(prefix + 1);
388 if ((prefix_len < 0) || (prefix_len > 128)) {
396 sai.sin_family = AF_INET;
398 if (!strcmp(host, bb_INET_default)) {
399 /* Default is special, meaning 0.0.0.0. */
400 sai.sin_addr.s_addr = INADDR_ANY;
401 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
402 } else if (((host[0] == '+') && !host[1]) && (mask & A_BROADCAST) &&
403 (did_flags & (A_NETMASK|A_HOSTNAME)) == (A_NETMASK|A_HOSTNAME)) {
404 /* + is special, meaning broadcast is derived. */
405 sai.sin_addr.s_addr = (~sai_netmask) | (sai_hostname & sai_netmask);
407 #ifdef CONFIG_FEATURE_IPV6
408 } else if (inet_pton(AF_INET6, host, &sai6.sin6_addr) > 0) {
410 struct in6_ifreq ifr6;
412 memcpy((char *) &ifr6.ifr6_addr,
413 (char *) &sai6.sin6_addr,
414 sizeof(struct in6_addr));
416 /* Create a channel to the NET kernel. */
417 if ((sockfd6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
418 perror_msg_and_die("socket6");
420 if (ioctl(sockfd6, SIOGIFINDEX, &ifr) < 0) {
421 perror("SIOGIFINDEX");
425 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
426 ifr6.ifr6_prefixlen = prefix_len;
427 if (ioctl(sockfd6, a1op->selector, &ifr6) < 0) {
433 } else if (inet_aton(host, &sai.sin_addr) == 0) {
434 /* It's not a dotted quad. */
438 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
439 if (mask & A_HOSTNAME) {
440 sai_hostname = sai.sin_addr.s_addr;
442 if (mask & A_NETMASK) {
443 sai_netmask = sai.sin_addr.s_addr;
447 #ifdef CONFIG_FEATURE_IFCONFIG_HW
448 } else { /* A_CAST_HOST_COPY_IN_ETHER */
449 /* This is the "hw" arg case. */
450 if (strcmp("ether", *argv) || (*++argv == NULL)) {
453 safe_strncpy(host, *argv, (sizeof host));
454 if (in_ether(host, &sa)) {
455 error_msg("invalid hw-addr %s", host);
462 memcpy((((char *) (&ifr)) + a1op->ifr_offset),
463 p, sizeof(struct sockaddr));
465 unsigned int i = strtoul(*argv, NULL, 0);
467 p = ((char *) (&ifr)) + a1op->ifr_offset;
468 #ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
469 if (mask & A_MAP_TYPE) {
470 if (ioctl(sockfd, SIOCGIFMAP, &ifr) < 0) {
474 if ((mask & A_MAP_UCHAR) == A_MAP_UCHAR) {
475 *((unsigned char *) p) = i;
476 } else if (mask & A_MAP_USHORT) {
477 *((unsigned short *) p) = i;
479 *((unsigned long *) p) = i;
483 if (mask & A_CAST_CHAR_PTR) {
484 *((caddr_t *) p) = (caddr_t) i;
485 } else { /* A_CAST_INT */
490 if (ioctl(sockfd, a1op->selector, &ifr) < 0) {
495 #ifdef QUESTIONABLE_ALIAS_CASE
496 if (mask & A_COLON_CHK) {
498 * Don't do the set_flag() if the address is an alias with
499 * a - at the end, since it's deleted already! - Roman
501 * Should really use regex.h here, not sure though how well
502 * it'll go with the cross-platform support etc.
505 short int found_colon = 0;
507 for (ptr = ifr.ifr_name; *ptr; ptr++) {
513 if (found_colon && *(ptr - 1) == '-') {
519 if (!(mask & A_SET_AFTER)) {
525 if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
526 perror("SIOCGIFFLAGS");
529 selector = op->selector;
530 if (mask & SET_MASK) {
531 ifr.ifr_flags |= selector;
533 ifr.ifr_flags &= ~selector;
535 if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
536 perror("SIOCSIFFLAGS");
542 } /* end of while-loop */
547 #ifdef CONFIG_FEATURE_IFCONFIG_HW
548 /* Input an Ethernet address and convert to binary. */
549 static int in_ether(char *bufp, struct sockaddr *sap)
556 sap->sa_family = ARPHRD_ETHER;
563 /* We might get a semicolon here - not required. */
564 if (i && (*bufp == ':')) {
570 if (((unsigned char)(c - '0')) <= 9) {
572 } else if (((unsigned char)((c|0x20) - 'a')) <= 5) {
573 c = (c|0x20) - ('a'-10);
574 } else if (j && (c == ':' || c == 0)) {
584 } while (++i < ETH_ALEN);
586 return (int) (*bufp); /* Error if we don't end at end of string. */