1 /* vi: set sw=4 ts=4: */
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).
7 * Bjorn Wesen, Axis Communications AB
10 * Authors of the original ifconfig was:
11 * Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
13 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
17 * Heavily modified by Manuel Novoa III Mar 6, 2001
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.
23 * Still missing: media, tunnel.
26 * IPV6 support added by Bart Visscher <magick@linux-fan.com>
31 #include <string.h> /* strcmp and friends */
32 #include <ctype.h> /* isdigit and friends */
33 #include <stddef.h> /* offsetof */
36 #include <sys/ioctl.h>
38 #include <net/if_arp.h>
39 #include <netinet/in.h>
40 #if __GLIBC__ >=2 && __GLIBC_MINOR >= 1
41 #include <netpacket/packet.h>
42 #include <net/ethernet.h>
44 #include <sys/types.h>
45 #include <netinet/if_ether.h>
47 #include "inet_common.h"
50 #ifdef CONFIG_FEATURE_IFCONFIG_SLIP
51 # include <net/if_slip.h>
54 /* I don't know if this is needed for busybox or not. Anyone? */
55 #define QUESTIONABLE_ALIAS_CASE
58 /* Defines for glibc2.0 users. */
60 # define SIOCSIFTXQLEN 0x8943
61 # define SIOCGIFTXQLEN 0x8942
64 /* ifr_qlen is ifru_ivalue, but it isn't present in 2.0 kernel headers */
66 # define ifr_qlen ifr_ifru.ifru_mtu
70 # define IFF_DYNAMIC 0x8000 /* dialup device with changing addresses */
73 #ifdef CONFIG_FEATURE_IPV6
75 struct in6_addr ifr6_addr;
76 uint32_t ifr6_prefixlen;
82 * Here are the bit masks for the "flags" member of struct options below.
83 * N_ signifies no arg prefix; M_ signifies arg prefixed by '-'.
84 * CLR clears the flag; SET sets the flag; ARG signifies (optional) arg.
93 #define M_MASK (M_CLR | M_SET | M_ARG)
94 #define N_MASK (N_CLR | N_SET | N_ARG)
95 #define SET_MASK (N_SET | M_SET)
96 #define CLR_MASK (N_CLR | M_CLR)
97 #define SET_CLR_MASK (SET_MASK | CLR_MASK)
98 #define ARG_MASK (M_ARG | N_ARG)
101 * Here are the bit masks for the "arg_flags" member of struct options below.
108 * 02 HOST_COPY in_ether
109 * 03 HOST_COPY INET_resolve
111 #define A_CAST_TYPE 0x03
114 * 00 not a map type (mem_start, io_addr, irq)
115 * 04 memstart (unsigned long)
116 * 08 io_addr (unsigned short)
117 * 0C irq (unsigned char)
119 #define A_MAP_TYPE 0x0C
120 #define A_ARG_REQ 0x10 /* Set if an arg is required. */
121 #define A_NETMASK 0x20 /* Set if netmask (check for multiple sets). */
122 #define A_SET_AFTER 0x40 /* Set a flag at the end. */
123 #define A_COLON_CHK 0x80 /* Is this needed? See below. */
124 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
125 #define A_HOSTNAME 0x100 /* Set if it is ip addr. */
126 #define A_BROADCAST 0x200 /* Set if it is broadcast addr. */
129 #define A_BROADCAST 0
133 * These defines are for dealing with the A_CAST_TYPE field.
135 #define A_CAST_CHAR_PTR 0x01
136 #define A_CAST_RESOLVE 0x01
137 #define A_CAST_HOST_COPY 0x02
138 #define A_CAST_HOST_COPY_IN_ETHER A_CAST_HOST_COPY
139 #define A_CAST_HOST_COPY_RESOLVE (A_CAST_HOST_COPY | A_CAST_RESOLVE)
142 * These defines are for dealing with the A_MAP_TYPE field.
144 #define A_MAP_ULONG 0x04 /* memstart */
145 #define A_MAP_USHORT 0x08 /* io_addr */
146 #define A_MAP_UCHAR 0x0C /* irq */
149 * Define the bit masks signifying which operations to perform for each arg.
152 #define ARG_METRIC (A_ARG_REQ /*| A_CAST_INT*/)
153 #define ARG_MTU (A_ARG_REQ /*| A_CAST_INT*/)
154 #define ARG_TXQUEUELEN (A_ARG_REQ /*| A_CAST_INT*/)
155 #define ARG_MEM_START (A_ARG_REQ | A_MAP_ULONG)
156 #define ARG_IO_ADDR (A_ARG_REQ | A_MAP_ULONG)
157 #define ARG_IRQ (A_ARG_REQ | A_MAP_UCHAR)
158 #define ARG_DSTADDR (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE)
159 #define ARG_NETMASK (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_NETMASK)
160 #define ARG_BROADCAST (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_BROADCAST)
161 #define ARG_HW (A_ARG_REQ | A_CAST_HOST_COPY_IN_ETHER)
162 #define ARG_POINTOPOINT (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
163 #define ARG_KEEPALIVE (A_ARG_REQ | A_CAST_CHAR_PTR)
164 #define ARG_OUTFILL (A_ARG_REQ | A_CAST_CHAR_PTR)
165 #define ARG_HOSTNAME (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_COLON_CHK | A_HOSTNAME)
166 #define ARG_ADD_DEL (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
170 * Set up the tables. Warning! They must have corresponding order!
176 unsigned short ifr_offset;
181 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
182 const unsigned int flags:6;
183 const unsigned int arg_flags:10;
185 const unsigned char flags;
186 const unsigned char arg_flags;
188 const unsigned short selector;
191 #define ifreq_offsetof(x) offsetof(struct ifreq, x)
193 static const struct arg1opt Arg1Opt[] = {
194 {"SIOCSIFMETRIC", SIOCSIFMETRIC, ifreq_offsetof(ifr_metric)},
195 {"SIOCSIFMTU", SIOCSIFMTU, ifreq_offsetof(ifr_mtu)},
196 {"SIOCSIFTXQLEN", SIOCSIFTXQLEN, ifreq_offsetof(ifr_qlen)},
197 {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
198 {"SIOCSIFNETMASK", SIOCSIFNETMASK, ifreq_offsetof(ifr_netmask)},
199 {"SIOCSIFBRDADDR", SIOCSIFBRDADDR, ifreq_offsetof(ifr_broadaddr)},
200 #ifdef CONFIG_FEATURE_IFCONFIG_HW
201 {"SIOCSIFHWADDR", SIOCSIFHWADDR, ifreq_offsetof(ifr_hwaddr)},
203 {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
204 #ifdef SIOCSKEEPALIVE
205 {"SIOCSKEEPALIVE", SIOCSKEEPALIVE, ifreq_offsetof(ifr_data)},
208 {"SIOCSOUTFILL", SIOCSOUTFILL, ifreq_offsetof(ifr_data)},
210 #ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
211 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.mem_start)},
212 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.base_addr)},
213 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.irq)},
215 /* Last entry if for unmatched (possibly hostname) arg. */
216 #ifdef CONFIG_FEATURE_IPV6
217 {"SIOCSIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
218 {"SIOCDIFADDR", SIOCDIFADDR, ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
220 {"SIOCSIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr)},
223 static const struct options OptArray[] = {
224 {"metric", N_ARG, ARG_METRIC, 0},
225 {"mtu", N_ARG, ARG_MTU, 0},
226 {"txqueuelen", N_ARG, ARG_TXQUEUELEN, 0},
227 {"dstaddr", N_ARG, ARG_DSTADDR, 0},
228 {"netmask", N_ARG, ARG_NETMASK, 0},
229 {"broadcast", N_ARG | M_CLR, ARG_BROADCAST, IFF_BROADCAST},
230 #ifdef CONFIG_FEATURE_IFCONFIG_HW
231 {"hw", N_ARG, ARG_HW, 0},
233 {"pointopoint", N_ARG | M_CLR, ARG_POINTOPOINT, IFF_POINTOPOINT},
234 #ifdef SIOCSKEEPALIVE
235 {"keepalive", N_ARG, ARG_KEEPALIVE, 0},
238 {"outfill", N_ARG, ARG_OUTFILL, 0},
240 #ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
241 {"mem_start", N_ARG, ARG_MEM_START, 0},
242 {"io_addr", N_ARG, ARG_IO_ADDR, 0},
243 {"irq", N_ARG, ARG_IRQ, 0},
245 #ifdef CONFIG_FEATURE_IPV6
246 {"add", N_ARG, ARG_ADD_DEL, 0},
247 {"del", N_ARG, ARG_ADD_DEL, 0},
249 {"arp", N_CLR | M_SET, 0, IFF_NOARP},
250 {"trailers", N_CLR | M_SET, 0, IFF_NOTRAILERS},
251 {"promisc", N_SET | M_CLR, 0, IFF_PROMISC},
252 {"multicast", N_SET | M_CLR, 0, IFF_MULTICAST},
253 {"allmulti", N_SET | M_CLR, 0, IFF_ALLMULTI},
254 {"dynamic", N_SET | M_CLR, 0, IFF_DYNAMIC},
255 {"up", N_SET, 0, (IFF_UP | IFF_RUNNING)},
256 {"down", N_CLR, 0, IFF_UP},
257 {NULL, 0, ARG_HOSTNAME, (IFF_UP | IFF_RUNNING)}
261 * A couple of prototypes.
264 #ifdef CONFIG_FEATURE_IFCONFIG_HW
265 static int in_ether(char *bufp, struct sockaddr *sap);
268 #ifdef CONFIG_FEATURE_IFCONFIG_STATUS
269 extern int interface_opt_a;
270 extern int display_interfaces(char *ifname);
277 int ifconfig_main(int argc, char **argv)
280 struct sockaddr_in sai;
281 #ifdef CONFIG_FEATURE_IPV6
282 struct sockaddr_in6 sai6;
284 #ifdef CONFIG_FEATURE_IFCONFIG_HW
287 const struct arg1opt *a1op;
288 const struct options *op;
289 int sockfd; /* socket fd we use to manipulate stuff with */
292 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
294 unsigned int did_flags;
295 unsigned int sai_hostname, sai_netmask;
298 unsigned char did_flags;
305 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
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 sockfd = bb_xsocket(AF_INET, SOCK_DGRAM, 0);
334 /* get interface name */
335 safe_strncpy(ifr.ifr_name, *argv, IFNAMSIZ);
337 /* Process the remaining arguments. */
338 while (*++argv != (char *) NULL) {
341 if (*p == '-') { /* If the arg starts with '-'... */
342 ++p; /* advance past it and */
343 mask = M_MASK; /* set the appropriate mask. */
345 for (op = OptArray; op->name; op++) { /* Find table entry. */
346 if (strcmp(p, op->name) == 0) { /* If name matches... */
347 if ((mask &= op->flags)) { /* set the mask and go. */
350 /* If we get here, there was a valid arg with an */
351 /* invalid '-' prefix. */
357 /* We fell through, so treat as possible hostname. */
358 a1op = Arg1Opt + (sizeof(Arg1Opt) / sizeof(Arg1Opt[0])) - 1;
359 mask = op->arg_flags;
363 if (mask & ARG_MASK) {
364 mask = op->arg_flags;
365 a1op = Arg1Opt + (op - OptArray);
366 if (mask & A_NETMASK & did_flags) {
369 if (*++argv == NULL) {
370 if (mask & A_ARG_REQ) {
374 mask &= A_SET_AFTER; /* just for broadcast */
376 } else { /* got an arg so process it */
378 did_flags |= (mask & (A_NETMASK|A_HOSTNAME));
379 if (mask & A_CAST_HOST_COPY) {
380 #ifdef CONFIG_FEATURE_IFCONFIG_HW
381 if (mask & A_CAST_RESOLVE) {
383 #ifdef CONFIG_FEATURE_IPV6
388 safe_strncpy(host, *argv, (sizeof host));
389 #ifdef CONFIG_FEATURE_IPV6
390 if ((prefix = strchr(host, '/'))) {
391 if (safe_strtoi(prefix + 1, &prefix_len) ||
392 (prefix_len < 0) || (prefix_len > 128))
401 sai.sin_family = AF_INET;
403 if (!strcmp(host, bb_INET_default)) {
404 /* Default is special, meaning 0.0.0.0. */
405 sai.sin_addr.s_addr = INADDR_ANY;
406 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
407 } else if (((host[0] == '+') && !host[1]) && (mask & A_BROADCAST) &&
408 (did_flags & (A_NETMASK|A_HOSTNAME)) == (A_NETMASK|A_HOSTNAME)) {
409 /* + is special, meaning broadcast is derived. */
410 sai.sin_addr.s_addr = (~sai_netmask) | (sai_hostname & sai_netmask);
412 #ifdef CONFIG_FEATURE_IPV6
413 } else if (inet_pton(AF_INET6, host, &sai6.sin6_addr) > 0) {
415 struct in6_ifreq ifr6;
417 memcpy((char *) &ifr6.ifr6_addr,
418 (char *) &sai6.sin6_addr,
419 sizeof(struct in6_addr));
421 /* Create a channel to the NET kernel. */
422 if ((sockfd6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
423 bb_perror_msg_and_die("socket6");
425 if (ioctl(sockfd6, SIOGIFINDEX, &ifr) < 0) {
426 perror("SIOGIFINDEX");
430 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
431 ifr6.ifr6_prefixlen = prefix_len;
432 if (ioctl(sockfd6, a1op->selector, &ifr6) < 0) {
438 } else if (inet_aton(host, &sai.sin_addr) == 0) {
439 /* It's not a dotted quad. */
441 if ((hp = gethostbyname(host)) == (struct hostent *)NULL) {
445 memcpy((char *) &sai.sin_addr, (char *) hp->h_addr_list[0],
446 sizeof(struct in_addr));
448 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
449 if (mask & A_HOSTNAME) {
450 sai_hostname = sai.sin_addr.s_addr;
452 if (mask & A_NETMASK) {
453 sai_netmask = sai.sin_addr.s_addr;
457 #ifdef CONFIG_FEATURE_IFCONFIG_HW
458 } else { /* A_CAST_HOST_COPY_IN_ETHER */
459 /* This is the "hw" arg case. */
460 if (strcmp("ether", *argv) || (*++argv == NULL)) {
463 safe_strncpy(host, *argv, (sizeof host));
464 if (in_ether(host, &sa)) {
465 bb_error_msg("invalid hw-addr %s", host);
472 memcpy((((char *) (&ifr)) + a1op->ifr_offset),
473 p, sizeof(struct sockaddr));
475 unsigned long i = strtoul(*argv, NULL, 0);
477 p = ((char *) (&ifr)) + a1op->ifr_offset;
478 #ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
479 if (mask & A_MAP_TYPE) {
480 if (ioctl(sockfd, SIOCGIFMAP, &ifr) < 0) {
484 if ((mask & A_MAP_UCHAR) == A_MAP_UCHAR) {
485 *((unsigned char *) p) = i;
486 } else if (mask & A_MAP_USHORT) {
487 *((unsigned short *) p) = i;
489 *((unsigned long *) p) = i;
493 if (mask & A_CAST_CHAR_PTR) {
494 *((caddr_t *) p) = (caddr_t) i;
495 } else { /* A_CAST_INT */
500 if (ioctl(sockfd, a1op->selector, &ifr) < 0) {
505 #ifdef QUESTIONABLE_ALIAS_CASE
506 if (mask & A_COLON_CHK) {
508 * Don't do the set_flag() if the address is an alias with
509 * a - at the end, since it's deleted already! - Roman
511 * Should really use regex.h here, not sure though how well
512 * it'll go with the cross-platform support etc.
515 short int found_colon = 0;
517 for (ptr = ifr.ifr_name; *ptr; ptr++) {
523 if (found_colon && *(ptr - 1) == '-') {
529 if (!(mask & A_SET_AFTER)) {
535 if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
536 perror("SIOCGIFFLAGS");
539 selector = op->selector;
540 if (mask & SET_MASK) {
541 ifr.ifr_flags |= selector;
543 ifr.ifr_flags &= ~selector;
545 if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
546 perror("SIOCSIFFLAGS");
552 } /* end of while-loop */
554 if (ENABLE_FEATURE_CLEAN_UP) close(sockfd);
558 #ifdef CONFIG_FEATURE_IFCONFIG_HW
559 /* Input an Ethernet address and convert to binary. */
560 static int in_ether(char *bufp, struct sockaddr *sap)
567 sap->sa_family = ARPHRD_ETHER;
574 /* We might get a semicolon here - not required. */
575 if (i && (*bufp == ':')) {
581 if (((unsigned char)(c - '0')) <= 9) {
583 } else if (((unsigned char)((c|0x20) - 'a')) <= 5) {
584 c = (c|0x20) - ('a'-10);
585 } else if (j && (c == ':' || c == 0)) {
595 } while (++i < ETH_ALEN);
597 return (int) (*bufp); /* Error if we don't end at end of string. */