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>
30 #include <net/if_arp.h>
31 #include <netinet/in.h>
32 #if __GLIBC__ >=2 && __GLIBC_MINOR__ >= 1
33 #include <netpacket/packet.h>
34 #include <net/ethernet.h>
36 #include <sys/types.h>
37 #include <netinet/if_ether.h>
39 #include "inet_common.h"
42 #if ENABLE_FEATURE_IFCONFIG_SLIP
43 # include <net/if_slip.h>
46 /* I don't know if this is needed for busybox or not. Anyone? */
47 #define QUESTIONABLE_ALIAS_CASE
50 /* Defines for glibc2.0 users. */
52 # define SIOCSIFTXQLEN 0x8943
53 # define SIOCGIFTXQLEN 0x8942
56 /* ifr_qlen is ifru_ivalue, but it isn't present in 2.0 kernel headers */
58 # define ifr_qlen ifr_ifru.ifru_mtu
62 # define IFF_DYNAMIC 0x8000 /* dialup device with changing addresses */
65 #if ENABLE_FEATURE_IPV6
67 struct in6_addr ifr6_addr;
68 uint32_t ifr6_prefixlen;
74 * Here are the bit masks for the "flags" member of struct options below.
75 * N_ signifies no arg prefix; M_ signifies arg prefixed by '-'.
76 * CLR clears the flag; SET sets the flag; ARG signifies (optional) arg.
85 #define M_MASK (M_CLR | M_SET | M_ARG)
86 #define N_MASK (N_CLR | N_SET | N_ARG)
87 #define SET_MASK (N_SET | M_SET)
88 #define CLR_MASK (N_CLR | M_CLR)
89 #define SET_CLR_MASK (SET_MASK | CLR_MASK)
90 #define ARG_MASK (M_ARG | N_ARG)
93 * Here are the bit masks for the "arg_flags" member of struct options below.
100 * 02 HOST_COPY in_ether
101 * 03 HOST_COPY INET_resolve
103 #define A_CAST_TYPE 0x03
106 * 00 not a map type (mem_start, io_addr, irq)
107 * 04 memstart (unsigned long)
108 * 08 io_addr (unsigned short)
109 * 0C irq (unsigned char)
111 #define A_MAP_TYPE 0x0C
112 #define A_ARG_REQ 0x10 /* Set if an arg is required. */
113 #define A_NETMASK 0x20 /* Set if netmask (check for multiple sets). */
114 #define A_SET_AFTER 0x40 /* Set a flag at the end. */
115 #define A_COLON_CHK 0x80 /* Is this needed? See below. */
116 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
117 #define A_HOSTNAME 0x100 /* Set if it is ip addr. */
118 #define A_BROADCAST 0x200 /* Set if it is broadcast addr. */
121 #define A_BROADCAST 0
125 * These defines are for dealing with the A_CAST_TYPE field.
127 #define A_CAST_CHAR_PTR 0x01
128 #define A_CAST_RESOLVE 0x01
129 #define A_CAST_HOST_COPY 0x02
130 #define A_CAST_HOST_COPY_IN_ETHER A_CAST_HOST_COPY
131 #define A_CAST_HOST_COPY_RESOLVE (A_CAST_HOST_COPY | A_CAST_RESOLVE)
134 * These defines are for dealing with the A_MAP_TYPE field.
136 #define A_MAP_ULONG 0x04 /* memstart */
137 #define A_MAP_USHORT 0x08 /* io_addr */
138 #define A_MAP_UCHAR 0x0C /* irq */
141 * Define the bit masks signifying which operations to perform for each arg.
144 #define ARG_METRIC (A_ARG_REQ /*| A_CAST_INT*/)
145 #define ARG_MTU (A_ARG_REQ /*| A_CAST_INT*/)
146 #define ARG_TXQUEUELEN (A_ARG_REQ /*| A_CAST_INT*/)
147 #define ARG_MEM_START (A_ARG_REQ | A_MAP_ULONG)
148 #define ARG_IO_ADDR (A_ARG_REQ | A_MAP_ULONG)
149 #define ARG_IRQ (A_ARG_REQ | A_MAP_UCHAR)
150 #define ARG_DSTADDR (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE)
151 #define ARG_NETMASK (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_NETMASK)
152 #define ARG_BROADCAST (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_BROADCAST)
153 #define ARG_HW (A_ARG_REQ | A_CAST_HOST_COPY_IN_ETHER)
154 #define ARG_POINTOPOINT (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
155 #define ARG_KEEPALIVE (A_ARG_REQ | A_CAST_CHAR_PTR)
156 #define ARG_OUTFILL (A_ARG_REQ | A_CAST_CHAR_PTR)
157 #define ARG_HOSTNAME (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_COLON_CHK | A_HOSTNAME)
158 #define ARG_ADD_DEL (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
162 * Set up the tables. Warning! They must have corresponding order!
168 unsigned short ifr_offset;
173 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
174 const unsigned int flags:6;
175 const unsigned int arg_flags:10;
177 const unsigned char flags;
178 const unsigned char arg_flags;
180 const unsigned short selector;
183 #define ifreq_offsetof(x) offsetof(struct ifreq, x)
185 static const struct arg1opt Arg1Opt[] = {
186 {"SIOCSIFMETRIC", SIOCSIFMETRIC, ifreq_offsetof(ifr_metric)},
187 {"SIOCSIFMTU", SIOCSIFMTU, ifreq_offsetof(ifr_mtu)},
188 {"SIOCSIFTXQLEN", SIOCSIFTXQLEN, ifreq_offsetof(ifr_qlen)},
189 {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
190 {"SIOCSIFNETMASK", SIOCSIFNETMASK, ifreq_offsetof(ifr_netmask)},
191 {"SIOCSIFBRDADDR", SIOCSIFBRDADDR, ifreq_offsetof(ifr_broadaddr)},
192 #if ENABLE_FEATURE_IFCONFIG_HW
193 {"SIOCSIFHWADDR", SIOCSIFHWADDR, ifreq_offsetof(ifr_hwaddr)},
195 {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
196 #ifdef SIOCSKEEPALIVE
197 {"SIOCSKEEPALIVE", SIOCSKEEPALIVE, ifreq_offsetof(ifr_data)},
200 {"SIOCSOUTFILL", SIOCSOUTFILL, ifreq_offsetof(ifr_data)},
202 #if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
203 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.mem_start)},
204 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.base_addr)},
205 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.irq)},
207 /* Last entry if for unmatched (possibly hostname) arg. */
208 #if ENABLE_FEATURE_IPV6
209 {"SIOCSIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
210 {"SIOCDIFADDR", SIOCDIFADDR, ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
212 {"SIOCSIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr)},
215 static const struct options OptArray[] = {
216 {"metric", N_ARG, ARG_METRIC, 0},
217 {"mtu", N_ARG, ARG_MTU, 0},
218 {"txqueuelen", N_ARG, ARG_TXQUEUELEN, 0},
219 {"dstaddr", N_ARG, ARG_DSTADDR, 0},
220 {"netmask", N_ARG, ARG_NETMASK, 0},
221 {"broadcast", N_ARG | M_CLR, ARG_BROADCAST, IFF_BROADCAST},
222 #if ENABLE_FEATURE_IFCONFIG_HW
223 {"hw", N_ARG, ARG_HW, 0},
225 {"pointopoint", N_ARG | M_CLR, ARG_POINTOPOINT, IFF_POINTOPOINT},
226 #ifdef SIOCSKEEPALIVE
227 {"keepalive", N_ARG, ARG_KEEPALIVE, 0},
230 {"outfill", N_ARG, ARG_OUTFILL, 0},
232 #if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
233 {"mem_start", N_ARG, ARG_MEM_START, 0},
234 {"io_addr", N_ARG, ARG_IO_ADDR, 0},
235 {"irq", N_ARG, ARG_IRQ, 0},
237 #if ENABLE_FEATURE_IPV6
238 {"add", N_ARG, ARG_ADD_DEL, 0},
239 {"del", N_ARG, ARG_ADD_DEL, 0},
241 {"arp", N_CLR | M_SET, 0, IFF_NOARP},
242 {"trailers", N_CLR | M_SET, 0, IFF_NOTRAILERS},
243 {"promisc", N_SET | M_CLR, 0, IFF_PROMISC},
244 {"multicast", N_SET | M_CLR, 0, IFF_MULTICAST},
245 {"allmulti", N_SET | M_CLR, 0, IFF_ALLMULTI},
246 {"dynamic", N_SET | M_CLR, 0, IFF_DYNAMIC},
247 {"up", N_SET, 0, (IFF_UP | IFF_RUNNING)},
248 {"down", N_CLR, 0, IFF_UP},
249 {NULL, 0, ARG_HOSTNAME, (IFF_UP | IFF_RUNNING)}
253 * A couple of prototypes.
256 #if ENABLE_FEATURE_IFCONFIG_HW
257 static int in_ether(const char *bufp, struct sockaddr *sap);
260 #if ENABLE_FEATURE_IFCONFIG_STATUS
261 extern int interface_opt_a;
262 extern int display_interfaces(char *ifname);
269 int ifconfig_main(int argc, char **argv)
272 struct sockaddr_in sai;
273 #if ENABLE_FEATURE_IPV6
274 struct sockaddr_in6 sai6;
276 #if ENABLE_FEATURE_IFCONFIG_HW
279 const struct arg1opt *a1op;
280 const struct options *op;
281 int sockfd; /* socket fd we use to manipulate stuff with */
284 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
286 unsigned int did_flags;
287 unsigned int sai_hostname, sai_netmask;
290 unsigned char did_flags;
294 const char *host = NULL; /* make gcc happy */
298 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
307 #if ENABLE_FEATURE_IFCONFIG_STATUS
308 if ((argc > 0) && (((*argv)[0] == '-') && ((*argv)[1] == 'a') && !(*argv)[2])) {
316 #if ENABLE_FEATURE_IFCONFIG_STATUS
317 return display_interfaces(argc ? *argv : NULL);
319 bb_error_msg_and_die("no support for status display");
323 /* Create a channel to the NET kernel. */
324 sockfd = xsocket(AF_INET, SOCK_DGRAM, 0);
326 /* get interface name */
327 safe_strncpy(ifr.ifr_name, *argv, IFNAMSIZ);
329 /* Process the remaining arguments. */
330 while (*++argv != (char *) NULL) {
333 if (*p == '-') { /* If the arg starts with '-'... */
334 ++p; /* advance past it and */
335 mask = M_MASK; /* set the appropriate mask. */
337 for (op = OptArray; op->name; op++) { /* Find table entry. */
338 if (strcmp(p, op->name) == 0) { /* If name matches... */
340 if (mask) { /* set the mask and go. */
343 /* If we get here, there was a valid arg with an */
344 /* invalid '-' prefix. */
350 /* We fell through, so treat as possible hostname. */
351 a1op = Arg1Opt + (sizeof(Arg1Opt) / sizeof(Arg1Opt[0])) - 1;
352 mask = op->arg_flags;
356 if (mask & ARG_MASK) {
357 mask = op->arg_flags;
358 a1op = Arg1Opt + (op - OptArray);
359 if (mask & A_NETMASK & did_flags) {
362 if (*++argv == NULL) {
363 if (mask & A_ARG_REQ) {
367 mask &= A_SET_AFTER; /* just for broadcast */
369 } else { /* got an arg so process it */
371 did_flags |= (mask & (A_NETMASK|A_HOSTNAME));
372 if (mask & A_CAST_HOST_COPY) {
373 #if ENABLE_FEATURE_IFCONFIG_HW
374 if (mask & A_CAST_RESOLVE) {
376 #if ENABLE_FEATURE_IPV6
380 /*safe_strncpy(host, *argv, (sizeof host));*/
382 #if ENABLE_FEATURE_IPV6
383 prefix = strchr(host, '/');
385 if (safe_strtoi(prefix + 1, &prefix_len) ||
386 (prefix_len < 0) || (prefix_len > 128))
395 sai.sin_family = AF_INET;
397 if (!strcmp(host, bb_str_default)) {
398 /* Default is special, meaning 0.0.0.0. */
399 sai.sin_addr.s_addr = INADDR_ANY;
400 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
401 } else if (((host[0] == '+') && !host[1]) && (mask & A_BROADCAST) &&
402 (did_flags & (A_NETMASK|A_HOSTNAME)) == (A_NETMASK|A_HOSTNAME)) {
403 /* + is special, meaning broadcast is derived. */
404 sai.sin_addr.s_addr = (~sai_netmask) | (sai_hostname & sai_netmask);
406 #if ENABLE_FEATURE_IPV6
407 } else if (inet_pton(AF_INET6, host, &sai6.sin6_addr) > 0) {
409 struct in6_ifreq ifr6;
411 memcpy((char *) &ifr6.ifr6_addr,
412 (char *) &sai6.sin6_addr,
413 sizeof(struct in6_addr));
415 /* Create a channel to the NET kernel. */
416 if ((sockfd6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
417 bb_perror_msg_and_die("socket6");
419 if (ioctl(sockfd6, SIOGIFINDEX, &ifr) < 0) {
420 perror("SIOGIFINDEX");
424 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
425 ifr6.ifr6_prefixlen = prefix_len;
426 if (ioctl(sockfd6, a1op->selector, &ifr6) < 0) {
432 } else if (inet_aton(host, &sai.sin_addr) == 0) {
433 /* It's not a dotted quad. */
434 struct hostent *hp = gethostbyname(host);
439 memcpy((char *) &sai.sin_addr, (char *) hp->h_addr_list[0],
440 sizeof(struct in_addr));
442 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
443 if (mask & A_HOSTNAME) {
444 sai_hostname = sai.sin_addr.s_addr;
446 if (mask & A_NETMASK) {
447 sai_netmask = sai.sin_addr.s_addr;
451 #if ENABLE_FEATURE_IFCONFIG_HW
452 } else { /* A_CAST_HOST_COPY_IN_ETHER */
453 /* This is the "hw" arg case. */
454 if (strcmp("ether", *argv) || (*++argv == NULL)) {
457 /*safe_strncpy(host, *argv, sizeof(host));*/
459 if (in_ether(host, &sa)) {
460 bb_error_msg("invalid hw-addr %s", host);
467 memcpy( (((char *)&ifr) + a1op->ifr_offset),
468 p, sizeof(struct sockaddr));
470 unsigned long i = strtoul(*argv, NULL, 0);
472 p = ((char *)&ifr) + a1op->ifr_offset;
473 #if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
474 if (mask & A_MAP_TYPE) {
475 if (ioctl(sockfd, SIOCGIFMAP, &ifr) < 0) {
479 if ((mask & A_MAP_UCHAR) == A_MAP_UCHAR) {
480 *((unsigned char *) p) = i;
481 } else if (mask & A_MAP_USHORT) {
482 *((unsigned short *) p) = i;
484 *((unsigned long *) p) = i;
488 if (mask & A_CAST_CHAR_PTR) {
489 *((caddr_t *) p) = (caddr_t) i;
490 } else { /* A_CAST_INT */
495 if (ioctl(sockfd, a1op->selector, &ifr) < 0) {
500 #ifdef QUESTIONABLE_ALIAS_CASE
501 if (mask & A_COLON_CHK) {
503 * Don't do the set_flag() if the address is an alias with
504 * a '-' at the end, since it's deleted already! - Roman
506 * Should really use regex.h here, not sure though how well
507 * it'll go with the cross-platform support etc.
510 short int found_colon = 0;
512 for (ptr = ifr.ifr_name; *ptr; ptr++) {
518 if (found_colon && *(ptr - 1) == '-') {
524 if (!(mask & A_SET_AFTER)) {
530 if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
531 perror("SIOCGIFFLAGS");
534 selector = op->selector;
535 if (mask & SET_MASK) {
536 ifr.ifr_flags |= selector;
538 ifr.ifr_flags &= ~selector;
540 if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
541 perror("SIOCSIFFLAGS");
547 } /* end of while-loop */
549 if (ENABLE_FEATURE_CLEAN_UP) close(sockfd);
553 #if ENABLE_FEATURE_IFCONFIG_HW
554 /* Input an Ethernet address and convert to binary. */
555 static int in_ether(const 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. */