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 1.30 2004/03/31 11:30:08 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 */
41 #include <sys/ioctl.h>
43 #include <net/if_arp.h>
44 #include <netinet/in.h>
45 #if __GLIBC__ >=2 && __GLIBC_MINOR >= 1
46 #include <netpacket/packet.h>
47 #include <net/ethernet.h>
49 #include <sys/types.h>
50 #include <netinet/if_ether.h>
52 #include "inet_common.h"
55 #ifdef CONFIG_FEATURE_IFCONFIG_SLIP
56 # include <net/if_slip.h>
59 /* I don't know if this is needed for busybox or not. Anyone? */
60 #define QUESTIONABLE_ALIAS_CASE
63 /* Defines for glibc2.0 users. */
65 # define SIOCSIFTXQLEN 0x8943
66 # define SIOCGIFTXQLEN 0x8942
69 /* ifr_qlen is ifru_ivalue, but it isn't present in 2.0 kernel headers */
71 # define ifr_qlen ifr_ifru.ifru_mtu
75 # define IFF_DYNAMIC 0x8000 /* dialup device with changing addresses */
78 #ifdef CONFIG_FEATURE_IPV6
80 struct in6_addr ifr6_addr;
81 uint32_t ifr6_prefixlen;
87 * Here are the bit masks for the "flags" member of struct options below.
88 * N_ signifies no arg prefix; M_ signifies arg prefixed by '-'.
89 * CLR clears the flag; SET sets the flag; ARG signifies (optional) arg.
98 #define M_MASK (M_CLR | M_SET | M_ARG)
99 #define N_MASK (N_CLR | N_SET | N_ARG)
100 #define SET_MASK (N_SET | M_SET)
101 #define CLR_MASK (N_CLR | M_CLR)
102 #define SET_CLR_MASK (SET_MASK | CLR_MASK)
103 #define ARG_MASK (M_ARG | N_ARG)
106 * Here are the bit masks for the "arg_flags" member of struct options below.
113 * 02 HOST_COPY in_ether
114 * 03 HOST_COPY INET_resolve
116 #define A_CAST_TYPE 0x03
119 * 00 not a map type (mem_start, io_addr, irq)
120 * 04 memstart (unsigned long)
121 * 08 io_addr (unsigned short)
122 * 0C irq (unsigned char)
124 #define A_MAP_TYPE 0x0C
125 #define A_ARG_REQ 0x10 /* Set if an arg is required. */
126 #define A_NETMASK 0x20 /* Set if netmask (check for multiple sets). */
127 #define A_SET_AFTER 0x40 /* Set a flag at the end. */
128 #define A_COLON_CHK 0x80 /* Is this needed? See below. */
129 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
130 #define A_HOSTNAME 0x100 /* Set if it is ip addr. */
131 #define A_BROADCAST 0x200 /* Set if it is broadcast addr. */
134 #define A_BROADCAST 0
138 * These defines are for dealing with the A_CAST_TYPE field.
140 #define A_CAST_CHAR_PTR 0x01
141 #define A_CAST_RESOLVE 0x01
142 #define A_CAST_HOST_COPY 0x02
143 #define A_CAST_HOST_COPY_IN_ETHER A_CAST_HOST_COPY
144 #define A_CAST_HOST_COPY_RESOLVE (A_CAST_HOST_COPY | A_CAST_RESOLVE)
147 * These defines are for dealing with the A_MAP_TYPE field.
149 #define A_MAP_ULONG 0x04 /* memstart */
150 #define A_MAP_USHORT 0x08 /* io_addr */
151 #define A_MAP_UCHAR 0x0C /* irq */
154 * Define the bit masks signifying which operations to perform for each arg.
157 #define ARG_METRIC (A_ARG_REQ /*| A_CAST_INT*/)
158 #define ARG_MTU (A_ARG_REQ /*| A_CAST_INT*/)
159 #define ARG_TXQUEUELEN (A_ARG_REQ /*| A_CAST_INT*/)
160 #define ARG_MEM_START (A_ARG_REQ | A_MAP_ULONG)
161 #define ARG_IO_ADDR (A_ARG_REQ | A_MAP_ULONG)
162 #define ARG_IRQ (A_ARG_REQ | A_MAP_UCHAR)
163 #define ARG_DSTADDR (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE)
164 #define ARG_NETMASK (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_NETMASK)
165 #define ARG_BROADCAST (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_BROADCAST)
166 #define ARG_HW (A_ARG_REQ | A_CAST_HOST_COPY_IN_ETHER)
167 #define ARG_POINTOPOINT (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
168 #define ARG_KEEPALIVE (A_ARG_REQ | A_CAST_CHAR_PTR)
169 #define ARG_OUTFILL (A_ARG_REQ | A_CAST_CHAR_PTR)
170 #define ARG_HOSTNAME (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_COLON_CHK | A_HOSTNAME)
171 #define ARG_ADD_DEL (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
175 * Set up the tables. Warning! They must have corresponding order!
181 unsigned short ifr_offset;
186 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
187 const unsigned int flags:6;
188 const unsigned int arg_flags:10;
190 const unsigned char flags;
191 const unsigned char arg_flags;
193 const unsigned short selector;
196 #define ifreq_offsetof(x) offsetof(struct ifreq, x)
198 static const struct arg1opt Arg1Opt[] = {
199 {"SIOCSIFMETRIC", SIOCSIFMETRIC, ifreq_offsetof(ifr_metric)},
200 {"SIOCSIFMTU", SIOCSIFMTU, ifreq_offsetof(ifr_mtu)},
201 {"SIOCSIFTXQLEN", SIOCSIFTXQLEN, ifreq_offsetof(ifr_qlen)},
202 {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
203 {"SIOCSIFNETMASK", SIOCSIFNETMASK, ifreq_offsetof(ifr_netmask)},
204 {"SIOCSIFBRDADDR", SIOCSIFBRDADDR, ifreq_offsetof(ifr_broadaddr)},
205 #ifdef CONFIG_FEATURE_IFCONFIG_HW
206 {"SIOCSIFHWADDR", SIOCSIFHWADDR, ifreq_offsetof(ifr_hwaddr)},
208 {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
209 #ifdef SIOCSKEEPALIVE
210 {"SIOCSKEEPALIVE", SIOCSKEEPALIVE, ifreq_offsetof(ifr_data)},
213 {"SIOCSOUTFILL", SIOCSOUTFILL, ifreq_offsetof(ifr_data)},
215 #ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
216 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.mem_start)},
217 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.base_addr)},
218 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.irq)},
220 /* Last entry if for unmatched (possibly hostname) arg. */
221 #ifdef CONFIG_FEATURE_IPV6
222 {"SIOCSIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
223 {"SIOCDIFADDR", SIOCDIFADDR, ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
225 {"SIOCSIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr)},
228 static const struct options OptArray[] = {
229 {"metric", N_ARG, ARG_METRIC, 0},
230 {"mtu", N_ARG, ARG_MTU, 0},
231 {"txqueuelen", N_ARG, ARG_TXQUEUELEN, 0},
232 {"dstaddr", N_ARG, ARG_DSTADDR, 0},
233 {"netmask", N_ARG, ARG_NETMASK, 0},
234 {"broadcast", N_ARG | M_CLR, ARG_BROADCAST, IFF_BROADCAST},
235 #ifdef CONFIG_FEATURE_IFCONFIG_HW
236 {"hw", N_ARG, ARG_HW, 0},
238 {"pointopoint", N_ARG | M_CLR, ARG_POINTOPOINT, IFF_POINTOPOINT},
239 #ifdef SIOCSKEEPALIVE
240 {"keepalive", N_ARG, ARG_KEEPALIVE, 0},
243 {"outfill", N_ARG, ARG_OUTFILL, 0},
245 #ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
246 {"mem_start", N_ARG, ARG_MEM_START, 0},
247 {"io_addr", N_ARG, ARG_IO_ADDR, 0},
248 {"irq", N_ARG, ARG_IRQ, 0},
250 #ifdef CONFIG_FEATURE_IPV6
251 {"add", N_ARG, ARG_ADD_DEL, 0},
252 {"del", N_ARG, ARG_ADD_DEL, 0},
254 {"arp", N_CLR | M_SET, 0, IFF_NOARP},
255 {"trailers", N_CLR | M_SET, 0, IFF_NOTRAILERS},
256 {"promisc", N_SET | M_CLR, 0, IFF_PROMISC},
257 {"multicast", N_SET | M_CLR, 0, IFF_MULTICAST},
258 {"allmulti", N_SET | M_CLR, 0, IFF_ALLMULTI},
259 {"dynamic", N_SET | M_CLR, 0, IFF_DYNAMIC},
260 {"up", N_SET, 0, (IFF_UP | IFF_RUNNING)},
261 {"down", N_CLR, 0, IFF_UP},
262 {NULL, 0, ARG_HOSTNAME, (IFF_UP | IFF_RUNNING)}
266 * A couple of prototypes.
269 #ifdef CONFIG_FEATURE_IFCONFIG_HW
270 static int in_ether(char *bufp, struct sockaddr *sap);
273 #ifdef CONFIG_FEATURE_IFCONFIG_STATUS
274 extern int interface_opt_a;
275 extern int display_interfaces(char *ifname);
282 int ifconfig_main(int argc, char **argv)
285 struct sockaddr_in sai;
286 #ifdef CONFIG_FEATURE_IPV6
287 struct sockaddr_in6 sai6;
289 #ifdef CONFIG_FEATURE_IFCONFIG_HW
292 const struct arg1opt *a1op;
293 const struct options *op;
294 int sockfd; /* socket fd we use to manipulate stuff with */
297 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
299 unsigned int did_flags;
300 unsigned int sai_hostname, sai_netmask;
303 unsigned char did_flags;
310 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
319 #ifdef CONFIG_FEATURE_IFCONFIG_STATUS
320 if ((argc > 0) && (((*argv)[0] == '-') && ((*argv)[1] == 'a') && !(*argv)[2])) {
328 #ifdef CONFIG_FEATURE_IFCONFIG_STATUS
329 return display_interfaces(argc ? *argv : NULL);
332 ("ifconfig was not compiled with interface status display support.");
336 /* Create a channel to the NET kernel. */
337 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
338 bb_perror_msg_and_die("socket");
341 /* get interface name */
342 safe_strncpy(ifr.ifr_name, *argv, IFNAMSIZ);
344 /* Process the remaining arguments. */
345 while (*++argv != (char *) NULL) {
348 if (*p == '-') { /* If the arg starts with '-'... */
349 ++p; /* advance past it and */
350 mask = M_MASK; /* set the appropriate mask. */
352 for (op = OptArray; op->name; op++) { /* Find table entry. */
353 if (strcmp(p, op->name) == 0) { /* If name matches... */
354 if ((mask &= op->flags)) { /* set the mask and go. */
357 /* If we get here, there was a valid arg with an */
358 /* invalid '-' prefix. */
364 /* We fell through, so treat as possible hostname. */
365 a1op = Arg1Opt + (sizeof(Arg1Opt) / sizeof(Arg1Opt[0])) - 1;
366 mask = op->arg_flags;
370 if (mask & ARG_MASK) {
371 mask = op->arg_flags;
372 a1op = Arg1Opt + (op - OptArray);
373 if (mask & A_NETMASK & did_flags) {
376 if (*++argv == NULL) {
377 if (mask & A_ARG_REQ) {
381 mask &= A_SET_AFTER; /* just for broadcast */
383 } else { /* got an arg so process it */
385 did_flags |= (mask & (A_NETMASK|A_HOSTNAME));
386 if (mask & A_CAST_HOST_COPY) {
387 #ifdef CONFIG_FEATURE_IFCONFIG_HW
388 if (mask & A_CAST_RESOLVE) {
390 #ifdef CONFIG_FEATURE_IPV6
395 safe_strncpy(host, *argv, (sizeof host));
396 #ifdef CONFIG_FEATURE_IPV6
397 if ((prefix = strchr(host, '/'))) {
398 if (safe_strtoi(prefix + 1, &prefix_len) ||
399 (prefix_len < 0) || (prefix_len > 128))
408 sai.sin_family = AF_INET;
410 if (!strcmp(host, bb_INET_default)) {
411 /* Default is special, meaning 0.0.0.0. */
412 sai.sin_addr.s_addr = INADDR_ANY;
413 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
414 } else if (((host[0] == '+') && !host[1]) && (mask & A_BROADCAST) &&
415 (did_flags & (A_NETMASK|A_HOSTNAME)) == (A_NETMASK|A_HOSTNAME)) {
416 /* + is special, meaning broadcast is derived. */
417 sai.sin_addr.s_addr = (~sai_netmask) | (sai_hostname & sai_netmask);
419 #ifdef CONFIG_FEATURE_IPV6
420 } else if (inet_pton(AF_INET6, host, &sai6.sin6_addr) > 0) {
422 struct in6_ifreq ifr6;
424 memcpy((char *) &ifr6.ifr6_addr,
425 (char *) &sai6.sin6_addr,
426 sizeof(struct in6_addr));
428 /* Create a channel to the NET kernel. */
429 if ((sockfd6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
430 bb_perror_msg_and_die("socket6");
432 if (ioctl(sockfd6, SIOGIFINDEX, &ifr) < 0) {
433 perror("SIOGIFINDEX");
437 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
438 ifr6.ifr6_prefixlen = prefix_len;
439 if (ioctl(sockfd6, a1op->selector, &ifr6) < 0) {
445 } else if (inet_aton(host, &sai.sin_addr) == 0) {
446 /* It's not a dotted quad. */
448 if ((hp = gethostbyname(host)) == (struct hostent *)NULL) {
452 memcpy((char *) &sai.sin_addr, (char *) hp->h_addr_list[0],
453 sizeof(struct in_addr));
455 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
456 if (mask & A_HOSTNAME) {
457 sai_hostname = sai.sin_addr.s_addr;
459 if (mask & A_NETMASK) {
460 sai_netmask = sai.sin_addr.s_addr;
464 #ifdef CONFIG_FEATURE_IFCONFIG_HW
465 } else { /* A_CAST_HOST_COPY_IN_ETHER */
466 /* This is the "hw" arg case. */
467 if (strcmp("ether", *argv) || (*++argv == NULL)) {
470 safe_strncpy(host, *argv, (sizeof host));
471 if (in_ether(host, &sa)) {
472 bb_error_msg("invalid hw-addr %s", host);
479 memcpy((((char *) (&ifr)) + a1op->ifr_offset),
480 p, sizeof(struct sockaddr));
482 unsigned int i = strtoul(*argv, NULL, 0);
484 p = ((char *) (&ifr)) + a1op->ifr_offset;
485 #ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
486 if (mask & A_MAP_TYPE) {
487 if (ioctl(sockfd, SIOCGIFMAP, &ifr) < 0) {
491 if ((mask & A_MAP_UCHAR) == A_MAP_UCHAR) {
492 *((unsigned char *) p) = i;
493 } else if (mask & A_MAP_USHORT) {
494 *((unsigned short *) p) = i;
496 *((unsigned long *) p) = i;
500 if (mask & A_CAST_CHAR_PTR) {
501 *((caddr_t *) p) = (caddr_t) i;
502 } else { /* A_CAST_INT */
507 if (ioctl(sockfd, a1op->selector, &ifr) < 0) {
512 #ifdef QUESTIONABLE_ALIAS_CASE
513 if (mask & A_COLON_CHK) {
515 * Don't do the set_flag() if the address is an alias with
516 * a - at the end, since it's deleted already! - Roman
518 * Should really use regex.h here, not sure though how well
519 * it'll go with the cross-platform support etc.
522 short int found_colon = 0;
524 for (ptr = ifr.ifr_name; *ptr; ptr++) {
530 if (found_colon && *(ptr - 1) == '-') {
536 if (!(mask & A_SET_AFTER)) {
542 if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
543 perror("SIOCGIFFLAGS");
546 selector = op->selector;
547 if (mask & SET_MASK) {
548 ifr.ifr_flags |= selector;
550 ifr.ifr_flags &= ~selector;
552 if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
553 perror("SIOCSIFFLAGS");
559 } /* end of while-loop */
564 #ifdef CONFIG_FEATURE_IFCONFIG_HW
565 /* Input an Ethernet address and convert to binary. */
566 static int in_ether(char *bufp, struct sockaddr *sap)
573 sap->sa_family = ARPHRD_ETHER;
580 /* We might get a semicolon here - not required. */
581 if (i && (*bufp == ':')) {
587 if (((unsigned char)(c - '0')) <= 9) {
589 } else if (((unsigned char)((c|0x20) - 'a')) <= 5) {
590 c = (c|0x20) - ('a'-10);
591 } else if (j && (c == ':' || c == 0)) {
601 } while (++i < ETH_ALEN);
603 return (int) (*bufp); /* Error if we don't end at end of string. */