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 1.22 2003/01/14 08:54:07 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>
42 #include <net/if_arp.h>
43 #include <netinet/in.h>
44 #if __GLIBC__ >=2 && __GLIBC_MINOR >= 1
45 #include <netpacket/packet.h>
46 #include <net/ethernet.h>
48 #include <asm/types.h>
49 #include <linux/if_ether.h>
51 #include "inet_common.h"
54 #ifdef CONFIG_FEATURE_IFCONFIG_SLIP
55 # include <net/if_slip.h>
58 /* I don't know if this is needed for busybox or not. Anyone? */
59 #define QUESTIONABLE_ALIAS_CASE
62 /* Defines for glibc2.0 users. */
64 # define SIOCSIFTXQLEN 0x8943
65 # define SIOCGIFTXQLEN 0x8942
68 /* ifr_qlen is ifru_ivalue, but it isn't present in 2.0 kernel headers */
70 # define ifr_qlen ifr_ifru.ifru_mtu
74 # define IFF_DYNAMIC 0x8000 /* dialup device with changing addresses */
77 #ifdef CONFIG_FEATURE_IPV6
79 struct in6_addr ifr6_addr;
80 uint32_t ifr6_prefixlen;
86 * Here are the bit masks for the "flags" member of struct options below.
87 * N_ signifies no arg prefix; M_ signifies arg prefixed by '-'.
88 * CLR clears the flag; SET sets the flag; ARG signifies (optional) arg.
97 #define M_MASK (M_CLR | M_SET | M_ARG)
98 #define N_MASK (N_CLR | N_SET | N_ARG)
99 #define SET_MASK (N_SET | M_SET)
100 #define CLR_MASK (N_CLR | M_CLR)
101 #define SET_CLR_MASK (SET_MASK | CLR_MASK)
102 #define ARG_MASK (M_ARG | N_ARG)
105 * Here are the bit masks for the "arg_flags" member of struct options below.
112 * 02 HOST_COPY in_ether
113 * 03 HOST_COPY INET_resolve
115 #define A_CAST_TYPE 0x03
118 * 00 not a map type (mem_start, io_addr, irq)
119 * 04 memstart (unsigned long)
120 * 08 io_addr (unsigned short)
121 * 0C irq (unsigned char)
123 #define A_MAP_TYPE 0x0C
124 #define A_ARG_REQ 0x10 /* Set if an arg is required. */
125 #define A_NETMASK 0x20 /* Set if netmask (check for multiple sets). */
126 #define A_SET_AFTER 0x40 /* Set a flag at the end. */
127 #define A_COLON_CHK 0x80 /* Is this needed? See below. */
128 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
129 #define A_HOSTNAME 0x100 /* Set if it is ip addr. */
130 #define A_BROADCAST 0x200 /* Set if it is broadcast addr. */
133 #define A_BROADCAST 0
137 * These defines are for dealing with the A_CAST_TYPE field.
139 #define A_CAST_CHAR_PTR 0x01
140 #define A_CAST_RESOLVE 0x01
141 #define A_CAST_HOST_COPY 0x02
142 #define A_CAST_HOST_COPY_IN_ETHER A_CAST_HOST_COPY
143 #define A_CAST_HOST_COPY_RESOLVE (A_CAST_HOST_COPY | A_CAST_RESOLVE)
146 * These defines are for dealing with the A_MAP_TYPE field.
148 #define A_MAP_ULONG 0x04 /* memstart */
149 #define A_MAP_USHORT 0x08 /* io_addr */
150 #define A_MAP_UCHAR 0x0C /* irq */
153 * Define the bit masks signifying which operations to perform for each arg.
156 #define ARG_METRIC (A_ARG_REQ /*| A_CAST_INT*/)
157 #define ARG_MTU (A_ARG_REQ /*| A_CAST_INT*/)
158 #define ARG_TXQUEUELEN (A_ARG_REQ /*| A_CAST_INT*/)
159 #define ARG_MEM_START (A_ARG_REQ | A_MAP_ULONG)
160 #define ARG_IO_ADDR (A_ARG_REQ | A_MAP_ULONG)
161 #define ARG_IRQ (A_ARG_REQ | A_MAP_UCHAR)
162 #define ARG_DSTADDR (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE)
163 #define ARG_NETMASK (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_NETMASK)
164 #define ARG_BROADCAST (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_BROADCAST)
165 #define ARG_HW (A_ARG_REQ | A_CAST_HOST_COPY_IN_ETHER)
166 #define ARG_POINTOPOINT (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
167 #define ARG_KEEPALIVE (A_ARG_REQ | A_CAST_CHAR_PTR)
168 #define ARG_OUTFILL (A_ARG_REQ | A_CAST_CHAR_PTR)
169 #define ARG_HOSTNAME (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_COLON_CHK | A_HOSTNAME)
170 #define ARG_ADD_DEL (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
174 * Set up the tables. Warning! They must have corresponding order!
179 unsigned short selector;
180 unsigned short ifr_offset;
185 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
186 const unsigned int flags:6;
187 const unsigned int arg_flags:10;
189 const unsigned char flags;
190 const unsigned char arg_flags;
192 const unsigned short selector;
195 #define ifreq_offsetof(x) offsetof(struct ifreq, x)
197 static const struct arg1opt Arg1Opt[] = {
198 {"SIOCSIFMETRIC", SIOCSIFMETRIC, ifreq_offsetof(ifr_metric)},
199 {"SIOCSIFMTU", SIOCSIFMTU, ifreq_offsetof(ifr_mtu)},
200 {"SIOCSIFTXQLEN", SIOCSIFTXQLEN, ifreq_offsetof(ifr_qlen)},
201 {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
202 {"SIOCSIFNETMASK", SIOCSIFNETMASK, ifreq_offsetof(ifr_netmask)},
203 {"SIOCSIFBRDADDR", SIOCSIFBRDADDR, ifreq_offsetof(ifr_broadaddr)},
204 #ifdef CONFIG_FEATURE_IFCONFIG_HW
205 {"SIOCSIFHWADDR", SIOCSIFHWADDR, ifreq_offsetof(ifr_hwaddr)},
207 {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
208 #ifdef SIOCSKEEPALIVE
209 {"SIOCSKEEPALIVE", SIOCSKEEPALIVE, ifreq_offsetof(ifr_data)},
212 {"SIOCSOUTFILL", SIOCSOUTFILL, ifreq_offsetof(ifr_data)},
214 #ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
215 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.mem_start)},
216 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.base_addr)},
217 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.irq)},
219 /* Last entry if for unmatched (possibly hostname) arg. */
220 #ifdef CONFIG_FEATURE_IPV6
221 {"SIOCSIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
222 {"SIOCDIFADDR", SIOCDIFADDR, ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
224 {"SIOCSIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr)},
227 static const struct options OptArray[] = {
228 {"metric", N_ARG, ARG_METRIC, 0},
229 {"mtu", N_ARG, ARG_MTU, 0},
230 {"txqueuelen", N_ARG, ARG_TXQUEUELEN, 0},
231 {"dstaddr", N_ARG, ARG_DSTADDR, 0},
232 {"netmask", N_ARG, ARG_NETMASK, 0},
233 {"broadcast", N_ARG | M_CLR, ARG_BROADCAST, IFF_BROADCAST},
234 #ifdef CONFIG_FEATURE_IFCONFIG_HW
235 {"hw", N_ARG, ARG_HW, 0},
237 {"pointopoint", N_ARG | M_CLR, ARG_POINTOPOINT, IFF_POINTOPOINT},
238 #ifdef SIOCSKEEPALIVE
239 {"keepalive", N_ARG, ARG_KEEPALIVE, 0},
242 {"outfill", N_ARG, ARG_OUTFILL, 0},
244 #ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
245 {"mem_start", N_ARG, ARG_MEM_START, 0},
246 {"io_addr", N_ARG, ARG_IO_ADDR, 0},
247 {"irq", N_ARG, ARG_IRQ, 0},
249 #ifdef CONFIG_FEATURE_IPV6
250 {"add", N_ARG, ARG_ADD_DEL, 0},
251 {"del", N_ARG, ARG_ADD_DEL, 0},
253 {"arp", N_CLR | M_SET, 0, IFF_NOARP},
254 {"trailers", N_CLR | M_SET, 0, IFF_NOTRAILERS},
255 {"promisc", N_SET | M_CLR, 0, IFF_PROMISC},
256 {"multicast", N_SET | M_CLR, 0, IFF_MULTICAST},
257 {"allmulti", N_SET | M_CLR, 0, IFF_ALLMULTI},
258 {"dynamic", N_SET | M_CLR, 0, IFF_DYNAMIC},
259 {"up", N_SET, 0, (IFF_UP | IFF_RUNNING)},
260 {"down", N_CLR, 0, IFF_UP},
261 {NULL, 0, ARG_HOSTNAME, (IFF_UP | IFF_RUNNING)}
265 * A couple of prototypes.
268 #ifdef CONFIG_FEATURE_IFCONFIG_HW
269 static int in_ether(char *bufp, struct sockaddr *sap);
272 #ifdef CONFIG_FEATURE_IFCONFIG_STATUS
273 extern int interface_opt_a;
274 extern int display_interfaces(char *ifname);
281 int ifconfig_main(int argc, char **argv)
284 struct sockaddr_in sai;
285 #ifdef CONFIG_FEATURE_IPV6
286 struct sockaddr_in6 sai6;
288 #ifdef CONFIG_FEATURE_IFCONFIG_HW
291 const struct arg1opt *a1op;
292 const struct options *op;
293 int sockfd; /* socket fd we use to manipulate stuff with */
296 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
298 unsigned int did_flags;
299 in_addr_t sai_hostname, sai_netmask;
302 unsigned char did_flags;
314 #ifdef CONFIG_FEATURE_IFCONFIG_STATUS
315 if ((argc > 0) && (((*argv)[0] == '-') && ((*argv)[1] == 'a') && !(*argv)[2])) {
323 #ifdef CONFIG_FEATURE_IFCONFIG_STATUS
324 return display_interfaces(argc ? *argv : NULL);
327 ("ifconfig was not compiled with interface status display support.");
331 /* Create a channel to the NET kernel. */
332 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
333 perror_msg_and_die("socket");
336 /* get interface name */
337 safe_strncpy(ifr.ifr_name, *argv, IFNAMSIZ);
339 /* Process the remaining arguments. */
340 while (*++argv != (char *) NULL) {
343 if (*p == '-') { /* If the arg starts with '-'... */
344 ++p; /* advance past it and */
345 mask = M_MASK; /* set the appropriate mask. */
347 for (op = OptArray; op->name; op++) { /* Find table entry. */
348 if (strcmp(p, op->name) == 0) { /* If name matches... */
349 if ((mask &= op->flags)) { /* set the mask and go. */
352 /* If we get here, there was a valid arg with an */
353 /* invalid '-' prefix. */
359 /* We fell through, so treat as possible hostname. */
360 a1op = Arg1Opt + (sizeof(Arg1Opt) / sizeof(Arg1Opt[0])) - 1;
361 mask = op->arg_flags;
365 if (mask & ARG_MASK) {
366 mask = op->arg_flags;
367 a1op = Arg1Opt + (op - OptArray);
368 if (mask & A_NETMASK & did_flags) {
371 if (*++argv == NULL) {
372 if (mask & A_ARG_REQ) {
376 mask &= A_SET_AFTER; /* just for broadcast */
378 } else { /* got an arg so process it */
380 did_flags |= (mask & (A_NETMASK|A_HOSTNAME));
381 if (mask & A_CAST_HOST_COPY) {
382 #ifdef CONFIG_FEATURE_IFCONFIG_HW
383 if (mask & A_CAST_RESOLVE) {
385 #ifdef CONFIG_FEATURE_IPV6
390 safe_strncpy(host, *argv, (sizeof host));
391 #ifdef CONFIG_FEATURE_IPV6
392 if ((prefix = strchr(host, '/'))) {
393 prefix_len = atol(prefix + 1);
394 if ((prefix_len < 0) || (prefix_len > 128)) {
402 sai.sin_family = AF_INET;
404 if (!strcmp(host, bb_INET_default)) {
405 /* Default is special, meaning 0.0.0.0. */
406 sai.sin_addr.s_addr = INADDR_ANY;
407 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
408 } else if (((host[0] == '+') && !host[1]) && (mask & A_BROADCAST) &&
409 (did_flags & (A_NETMASK|A_HOSTNAME)) == (A_NETMASK|A_HOSTNAME)) {
410 /* + is special, meaning broadcast is derived. */
411 sai.sin_addr.s_addr = (~sai_netmask) | (sai_hostname & sai_netmask);
413 #ifdef CONFIG_FEATURE_IPV6
414 } else if (inet_pton(AF_INET6, host, &sai6.sin6_addr) > 0) {
416 struct in6_ifreq ifr6;
418 memcpy((char *) &ifr6.ifr6_addr,
419 (char *) &sai6.sin6_addr,
420 sizeof(struct in6_addr));
422 /* Create a channel to the NET kernel. */
423 if ((sockfd6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
424 perror_msg_and_die("socket6");
426 if (ioctl(sockfd6, SIOGIFINDEX, &ifr) < 0) {
427 perror("SIOGIFINDEX");
431 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
432 ifr6.ifr6_prefixlen = prefix_len;
433 if (ioctl(sockfd6, a1op->selector, &ifr6) < 0) {
439 } else if (inet_aton(host, &sai.sin_addr) == 0) {
440 /* It's not a dotted quad. */
444 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
445 if (mask & A_HOSTNAME) {
446 sai_hostname = sai.sin_addr.s_addr;
448 if (mask & A_NETMASK) {
449 sai_netmask = sai.sin_addr.s_addr;
453 #ifdef CONFIG_FEATURE_IFCONFIG_HW
454 } else { /* A_CAST_HOST_COPY_IN_ETHER */
455 /* This is the "hw" arg case. */
456 if (strcmp("ether", *argv) || (*++argv == NULL)) {
459 safe_strncpy(host, *argv, (sizeof host));
460 if (in_ether(host, &sa)) {
461 error_msg("invalid hw-addr %s", host);
468 memcpy((((char *) (&ifr)) + a1op->ifr_offset),
469 p, sizeof(struct sockaddr));
471 unsigned int i = strtoul(*argv, NULL, 0);
473 p = ((char *) (&ifr)) + a1op->ifr_offset;
474 #ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
475 if (mask & A_MAP_TYPE) {
476 if (ioctl(sockfd, SIOCGIFMAP, &ifr) < 0) {
480 if ((mask & A_MAP_UCHAR) == A_MAP_UCHAR) {
481 *((unsigned char *) p) = i;
482 } else if (mask & A_MAP_USHORT) {
483 *((unsigned short *) p) = i;
485 *((unsigned long *) p) = i;
489 if (mask & A_CAST_CHAR_PTR) {
490 *((caddr_t *) p) = (caddr_t) i;
491 } else { /* A_CAST_INT */
496 if (ioctl(sockfd, a1op->selector, &ifr) < 0) {
501 #ifdef QUESTIONABLE_ALIAS_CASE
502 if (mask & A_COLON_CHK) {
504 * Don't do the set_flag() if the address is an alias with
505 * a - at the end, since it's deleted already! - Roman
507 * Should really use regex.h here, not sure though how well
508 * it'll go with the cross-platform support etc.
511 short int found_colon = 0;
513 for (ptr = ifr.ifr_name; *ptr; ptr++) {
519 if (found_colon && *(ptr - 1) == '-') {
525 if (!(mask & A_SET_AFTER)) {
531 if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
532 perror("SIOCGIFFLAGS");
535 selector = op->selector;
536 if (mask & SET_MASK) {
537 ifr.ifr_flags |= selector;
539 ifr.ifr_flags &= ~selector;
541 if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
542 perror("SIOCSIFFLAGS");
548 } /* end of while-loop */
553 #ifdef CONFIG_FEATURE_IFCONFIG_HW
554 /* Input an Ethernet address and convert to binary. */
555 static int in_ether(char *bufp, struct sockaddr *sap)
562 sap->sa_family = ARPHRD_ETHER;
569 /* We might get a semicolon here - not required. */
570 if (i && (*bufp == ':')) {
576 if (((unsigned char)(c - '0')) <= 9) {
578 } else if (((unsigned char)((c|0x20) - 'a')) <= 5) {
579 c = (c|0x20) - ('a'-10);
580 } else if (j && (c == ':' || c == 0)) {
590 } while (++i < ETH_ALEN);
592 return (int) (*bufp); /* Error if we don't end at end of string. */