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 1.18 2002/07/11 11:11:52 andersen 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 #if 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. */
124 * These defines are for dealing with the A_CAST_TYPE field.
126 #define A_CAST_CHAR_PTR 0x01
127 #define A_CAST_RESOLVE 0x01
128 #define A_CAST_HOST_COPY 0x02
129 #define A_CAST_HOST_COPY_IN_ETHER A_CAST_HOST_COPY
130 #define A_CAST_HOST_COPY_RESOLVE (A_CAST_HOST_COPY | A_CAST_RESOLVE)
133 * These defines are for dealing with the A_MAP_TYPE field.
135 #define A_MAP_ULONG 0x04 /* memstart */
136 #define A_MAP_USHORT 0x08 /* io_addr */
137 #define A_MAP_UCHAR 0x0C /* irq */
140 * Define the bit masks signifying which operations to perform for each arg.
143 #define ARG_METRIC (A_ARG_REQ /*| A_CAST_INT*/)
144 #define ARG_MTU (A_ARG_REQ /*| A_CAST_INT*/)
145 #define ARG_TXQUEUELEN (A_ARG_REQ /*| A_CAST_INT*/)
146 #define ARG_MEM_START (A_ARG_REQ | A_MAP_ULONG)
147 #define ARG_IO_ADDR (A_ARG_REQ | A_MAP_ULONG)
148 #define ARG_IRQ (A_ARG_REQ | A_MAP_UCHAR)
149 #define ARG_DSTADDR (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE)
150 #define ARG_NETMASK (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_NETMASK)
151 #define ARG_BROADCAST (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
152 #define ARG_HW (A_ARG_REQ | A_CAST_HOST_COPY_IN_ETHER)
153 #define ARG_POINTOPOINT (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
154 #define ARG_KEEPALIVE (A_ARG_REQ | A_CAST_CHAR_PTR)
155 #define ARG_OUTFILL (A_ARG_REQ | A_CAST_CHAR_PTR)
156 #define ARG_HOSTNAME (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_COLON_CHK)
157 #define ARG_ADD_DEL (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
161 * Set up the tables. Warning! They must have corresponding order!
166 unsigned short selector;
167 unsigned short ifr_offset;
172 const unsigned char flags;
173 const unsigned char arg_flags;
174 const unsigned short selector;
177 #define ifreq_offsetof(x) offsetof(struct ifreq, x)
179 static const struct arg1opt Arg1Opt[] = {
180 {"SIOCSIFMETRIC", SIOCSIFMETRIC, ifreq_offsetof(ifr_metric)},
181 {"SIOCSIFMTU", SIOCSIFMTU, ifreq_offsetof(ifr_mtu)},
182 {"SIOCSIFTXQLEN", SIOCSIFTXQLEN, ifreq_offsetof(ifr_qlen)},
183 {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
184 {"SIOCSIFNETMASK", SIOCSIFNETMASK, ifreq_offsetof(ifr_netmask)},
185 {"SIOCSIFBRDADDR", SIOCSIFBRDADDR, ifreq_offsetof(ifr_broadaddr)},
186 #ifdef CONFIG_FEATURE_IFCONFIG_HW
187 {"SIOCSIFHWADDR", SIOCSIFHWADDR, ifreq_offsetof(ifr_hwaddr)},
189 {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
190 #ifdef SIOCSKEEPALIVE
191 {"SIOCSKEEPALIVE", SIOCSKEEPALIVE, ifreq_offsetof(ifr_data)},
194 {"SIOCSOUTFILL", SIOCSOUTFILL, ifreq_offsetof(ifr_data)},
196 #ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
197 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.mem_start)},
198 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.base_addr)},
199 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.irq)},
201 /* Last entry if for unmatched (possibly hostname) arg. */
202 #if CONFIG_FEATURE_IPV6
203 {"SIOCSIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
204 {"SIOCDIFADDR", SIOCDIFADDR, ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
206 {"SIOCSIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr)},
209 static const struct options OptArray[] = {
210 {"metric", N_ARG, ARG_METRIC, 0},
211 {"mtu", N_ARG, ARG_MTU, 0},
212 {"txqueuelen", N_ARG, ARG_TXQUEUELEN, 0},
213 {"dstaddr", N_ARG, ARG_DSTADDR, 0},
214 {"netmask", N_ARG, ARG_NETMASK, 0},
215 {"broadcast", N_ARG | M_CLR, ARG_BROADCAST, IFF_BROADCAST},
216 #ifdef CONFIG_FEATURE_IFCONFIG_HW
217 {"hw", N_ARG, ARG_HW, 0},
219 {"pointopoint", N_ARG | M_CLR, ARG_POINTOPOINT, IFF_POINTOPOINT},
220 #ifdef SIOCSKEEPALIVE
221 {"keepalive", N_ARG, ARG_KEEPALIVE, 0},
224 {"outfill", N_ARG, ARG_OUTFILL, 0},
226 #ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
227 {"mem_start", N_ARG, ARG_MEM_START, 0},
228 {"io_addr", N_ARG, ARG_IO_ADDR, 0},
229 {"irq", N_ARG, ARG_IRQ, 0},
231 #if CONFIG_FEATURE_IPV6
232 {"add", N_ARG, ARG_ADD_DEL, 0},
233 {"del", N_ARG, ARG_ADD_DEL, 0},
235 {"arp", N_CLR | M_SET, 0, IFF_NOARP},
236 {"trailers", N_CLR | M_SET, 0, IFF_NOTRAILERS},
237 {"promisc", N_SET | M_CLR, 0, IFF_PROMISC},
238 {"multicast", N_SET | M_CLR, 0, IFF_MULTICAST},
239 {"allmulti", N_SET | M_CLR, 0, IFF_ALLMULTI},
240 {"dynamic", N_SET | M_CLR, 0, IFF_DYNAMIC},
241 {"up", N_SET , 0, (IFF_UP | IFF_RUNNING)},
242 {"down", N_CLR , 0, IFF_UP},
243 { NULL, 0, ARG_HOSTNAME, (IFF_UP | IFF_RUNNING)}
247 * A couple of prototypes.
250 #ifdef CONFIG_FEATURE_IFCONFIG_HW
251 static int in_ether(char *bufp, struct sockaddr *sap);
254 #ifdef CONFIG_FEATURE_IFCONFIG_STATUS
255 extern int interface_opt_a;
256 extern int display_interfaces(char *ifname);
263 int ifconfig_main(int argc, char **argv)
266 struct sockaddr_in sai;
267 #if CONFIG_FEATURE_IPV6
268 struct sockaddr_in6 sai6;
270 #ifdef CONFIG_FEATURE_IFCONFIG_HW
273 const struct arg1opt *a1op;
274 const struct options *op;
275 int sockfd; /* socket fd we use to manipulate stuff with */
281 unsigned char did_flags;
290 #ifdef CONFIG_FEATURE_IFCONFIG_STATUS
291 if ((argc > 0) && (strcmp(*argv,"-a") == 0)) {
299 #ifdef CONFIG_FEATURE_IFCONFIG_STATUS
300 return display_interfaces(argc ? *argv : NULL);
302 error_msg_and_die( "ifconfig was not compiled with interface status display support.");
306 /* Create a channel to the NET kernel. */
307 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
308 perror_msg_and_die("socket");
311 /* get interface name */
312 safe_strncpy(ifr.ifr_name, *argv, IFNAMSIZ);
314 /* Process the remaining arguments. */
315 while (*++argv != (char *) NULL) {
318 if (*p == '-') { /* If the arg starts with '-'... */
319 ++p; /* advance past it and */
320 mask = M_MASK; /* set the appropriate mask. */
322 for (op = OptArray ; op->name ; op++) { /* Find table entry. */
323 if (strcmp(p,op->name) == 0) { /* If name matches... */
324 if ((mask &= op->flags)) { /* set the mask and go. */
327 /* If we get here, there was a valid arg with an */
328 /* invalid '-' prefix. */
334 /* We fell through, so treat as possible hostname. */
335 a1op = Arg1Opt + (sizeof(Arg1Opt) / sizeof(Arg1Opt[0])) - 1;
336 mask = op->arg_flags;
340 if (mask & ARG_MASK) {
341 mask = op->arg_flags;
342 a1op = Arg1Opt + (op - OptArray);
343 if (mask & A_NETMASK & did_flags) {
346 if (*++argv == NULL) {
347 if (mask & A_ARG_REQ) {
351 mask &= A_SET_AFTER; /* just for broadcast */
353 } else { /* got an arg so process it */
355 did_flags |= (mask & A_NETMASK);
356 if (mask & A_CAST_HOST_COPY) {
357 #ifdef CONFIG_FEATURE_IFCONFIG_HW
358 if (mask & A_CAST_RESOLVE) {
360 #if CONFIG_FEATURE_IPV6
365 safe_strncpy(host, *argv, (sizeof host));
366 #if CONFIG_FEATURE_IPV6
367 if ((prefix = strchr(host, '/'))) {
368 prefix_len = atol(prefix + 1);
369 if ((prefix_len < 0) || (prefix_len > 128)) {
377 sai.sin_family = AF_INET;
379 if (!strcmp(host, bb_INET_default)) {
380 /* Default is special, meaning 0.0.0.0. */
381 sai.sin_addr.s_addr = INADDR_ANY;
382 #if CONFIG_FEATURE_IPV6
384 if (inet_pton(AF_INET6, host, &sai6.sin6_addr) > 0) {
386 struct in6_ifreq ifr6;
388 memcpy((char *) &ifr6.ifr6_addr, (char *) &sai6.sin6_addr,
389 sizeof(struct in6_addr));
391 /* Create a channel to the NET kernel. */
392 if ((sockfd6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
393 perror_msg_and_die("socket6");
395 if (ioctl(sockfd6, SIOGIFINDEX, &ifr) < 0) {
396 perror("SIOGIFINDEX");
400 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
401 ifr6.ifr6_prefixlen = prefix_len;
402 if (ioctl(sockfd6, a1op->selector, &ifr6) < 0) {
408 } else if (inet_aton(host, &sai.sin_addr) == 0) {
409 /* It's not a dotted quad. */
414 #ifdef CONFIG_FEATURE_IFCONFIG_HW
415 } else { /* A_CAST_HOST_COPY_IN_ETHER */
416 /* This is the "hw" arg case. */
417 if (strcmp("ether", *argv) || (*++argv == NULL)) {
420 safe_strncpy(host, *argv, (sizeof host));
421 if (in_ether(host, &sa)) {
422 error_msg("invalid hw-addr %s", host);
429 memcpy((((char *)(&ifr)) + a1op->ifr_offset),
430 p, sizeof(struct sockaddr));
432 unsigned int i = strtoul(*argv,NULL,0);
433 p = ((char *)(&ifr)) + a1op->ifr_offset;
434 #ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
435 if (mask & A_MAP_TYPE) {
436 if (ioctl(sockfd, SIOCGIFMAP, &ifr) < 0) {
440 if ((mask & A_MAP_UCHAR) == A_MAP_UCHAR) {
441 *((unsigned char *) p) = i;
442 } else if (mask & A_MAP_USHORT) {
443 *((unsigned short *) p) = i;
445 *((unsigned long *) p) = i;
449 if (mask & A_CAST_CHAR_PTR) {
450 *((caddr_t *) p) = (caddr_t) i;
451 } else { /* A_CAST_INT */
456 if (ioctl(sockfd, a1op->selector, &ifr) < 0) {
462 #ifdef QUESTIONABLE_ALIAS_CASE
463 if (mask & A_COLON_CHK) {
465 * Don't do the set_flag() if the address is an alias with
466 * a - at the end, since it's deleted already! - Roman
468 * Should really use regex.h here, not sure though how well
469 * it'll go with the cross-platform support etc.
472 short int found_colon = 0;
473 for (ptr = ifr.ifr_name; *ptr; ptr++ ) {
479 if (found_colon && *(ptr - 1) == '-') {
485 if (!(mask & A_SET_AFTER)) {
491 if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
492 perror("SIOCGIFFLAGS");
495 selector = op->selector;
496 if (mask & SET_MASK) {
497 ifr.ifr_flags |= selector;
499 ifr.ifr_flags &= ~selector;
501 if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
502 perror("SIOCSIFFLAGS");
508 } /* end of while-loop */
513 #ifdef CONFIG_FEATURE_IFCONFIG_HW
514 /* Input an Ethernet address and convert to binary. */
516 in_ether(char *bufp, struct sockaddr *sap)
523 sap->sa_family = ARPHRD_ETHER;
526 for (i = 0 ; i < ETH_ALEN ; i++) {
529 /* We might get a semicolon here - not required. */
530 if (i && (*bufp == ':')) {
534 for (j=0 ; j<2 ; j++) {
536 if (c >= '0' && c <= '9') {
538 } else if (c >= 'a' && c <= 'f') {
540 } else if (c >= 'A' && c <= 'F') {
542 } else if (j && (c == ':' || c == 0)) {
554 return (int) (*bufp); /* Error if we don't end at end of string. */