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 defined(__GLIBC__) && __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!
167 unsigned short selector
;
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 { "SIFMETRIC", SIOCSIFMETRIC
, ifreq_offsetof(ifr_metric
) },
187 { "SIFMTU", SIOCSIFMTU
, ifreq_offsetof(ifr_mtu
) },
188 { "SIFTXQLEN", SIOCSIFTXQLEN
, ifreq_offsetof(ifr_qlen
) },
189 { "SIFDSTADDR", SIOCSIFDSTADDR
, ifreq_offsetof(ifr_dstaddr
) },
190 { "SIFNETMASK", SIOCSIFNETMASK
, ifreq_offsetof(ifr_netmask
) },
191 { "SIFBRDADDR", SIOCSIFBRDADDR
, ifreq_offsetof(ifr_broadaddr
) },
192 #if ENABLE_FEATURE_IFCONFIG_HW
193 { "SIFHWADDR", SIOCSIFHWADDR
, ifreq_offsetof(ifr_hwaddr
) },
195 { "SIFDSTADDR", SIOCSIFDSTADDR
, ifreq_offsetof(ifr_dstaddr
) },
196 #ifdef SIOCSKEEPALIVE
197 { "SKEEPALIVE", SIOCSKEEPALIVE
, ifreq_offsetof(ifr_data
) },
200 { "SOUTFILL", SIOCSOUTFILL
, ifreq_offsetof(ifr_data
) },
202 #if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
203 { "SIFMAP", SIOCSIFMAP
, ifreq_offsetof(ifr_map
.mem_start
) },
204 { "SIFMAP", SIOCSIFMAP
, ifreq_offsetof(ifr_map
.base_addr
) },
205 { "SIFMAP", SIOCSIFMAP
, ifreq_offsetof(ifr_map
.irq
) },
207 /* Last entry if for unmatched (possibly hostname) arg. */
208 #if ENABLE_FEATURE_IPV6
209 { "SIFADDR", SIOCSIFADDR
, ifreq_offsetof(ifr_addr
) }, /* IPv6 version ignores the offset */
210 { "DIFADDR", SIOCDIFADDR
, ifreq_offsetof(ifr_addr
) }, /* IPv6 version ignores the offset */
212 { "SIFADDR", 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.
255 #if ENABLE_FEATURE_IFCONFIG_HW
256 static int in_ether(const char *bufp
, struct sockaddr
*sap
);
262 int ifconfig_main(int argc
, char **argv
) MAIN_EXTERNALLY_VISIBLE
;
263 int ifconfig_main(int argc
, char **argv
)
266 struct sockaddr_in sai
;
267 #if ENABLE_FEATURE_IFCONFIG_HW
270 const struct arg1opt
*a1op
;
271 const struct options
*op
;
272 int sockfd
; /* socket fd we use to manipulate stuff with */
274 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
276 unsigned int did_flags
;
277 unsigned int sai_hostname
, sai_netmask
;
280 unsigned char did_flags
;
284 const char *host
= NULL
; /* make gcc happy */
287 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
296 #if ENABLE_FEATURE_IFCONFIG_STATUS
297 if (argc
> 0 && (argv
[0][0] == '-' && argv
[0][1] == 'a' && !argv
[0][2])) {
305 #if ENABLE_FEATURE_IFCONFIG_STATUS
306 return display_interfaces(argc
? *argv
: NULL
);
308 bb_error_msg_and_die("no support for status display");
312 /* Create a channel to the NET kernel. */
313 sockfd
= xsocket(AF_INET
, SOCK_DGRAM
, 0);
315 /* get interface name */
316 strncpy_IFNAMSIZ(ifr
.ifr_name
, *argv
);
318 /* Process the remaining arguments. */
319 while (*++argv
!= (char *) NULL
) {
322 if (*p
== '-') { /* If the arg starts with '-'... */
323 ++p
; /* advance past it and */
324 mask
= M_MASK
; /* set the appropriate mask. */
326 for (op
= OptArray
; op
->name
; op
++) { /* Find table entry. */
327 if (strcmp(p
, op
->name
) == 0) { /* If name matches... */
329 if (mask
) /* set the mask and go. */
331 /* If we get here, there was a valid arg with an */
332 /* invalid '-' prefix. */
333 bb_error_msg_and_die("bad: '%s'", p
-1);
337 /* We fell through, so treat as possible hostname. */
338 a1op
= Arg1Opt
+ ARRAY_SIZE(Arg1Opt
) - 1;
339 mask
= op
->arg_flags
;
343 if (mask
& ARG_MASK
) {
344 mask
= op
->arg_flags
;
345 a1op
= Arg1Opt
+ (op
- OptArray
);
346 if (mask
& A_NETMASK
& did_flags
)
348 if (*++argv
== NULL
) {
349 if (mask
& A_ARG_REQ
)
352 mask
&= A_SET_AFTER
; /* just for broadcast */
353 } else { /* got an arg so process it */
355 did_flags
|= (mask
& (A_NETMASK
|A_HOSTNAME
));
356 if (mask
& A_CAST_HOST_COPY
) {
357 #if ENABLE_FEATURE_IFCONFIG_HW
358 if (mask
& A_CAST_RESOLVE
) {
360 #if ENABLE_FEATURE_IPV6
364 /*safe_strncpy(host, *argv, (sizeof host));*/
366 #if ENABLE_FEATURE_IPV6
367 prefix
= strchr(host
, '/');
369 prefix_len
= xatou_range(prefix
+ 1, 0, 128);
373 sai
.sin_family
= AF_INET
;
375 if (!strcmp(host
, bb_str_default
)) {
376 /* Default is special, meaning 0.0.0.0. */
377 sai
.sin_addr
.s_addr
= INADDR_ANY
;
379 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
380 else if ((host
[0] == '+' && !host
[1]) && (mask
& A_BROADCAST
)
381 && (did_flags
& (A_NETMASK
|A_HOSTNAME
)) == (A_NETMASK
|A_HOSTNAME
)
383 /* + is special, meaning broadcast is derived. */
384 sai
.sin_addr
.s_addr
= (~sai_netmask
) | (sai_hostname
& sai_netmask
);
388 len_and_sockaddr
*lsa
;
389 if (strcmp(host
, "inet") == 0)
390 continue; /* compat stuff */
391 lsa
= xhost2sockaddr(host
, 0);
392 #if ENABLE_FEATURE_IPV6
393 if (lsa
->u
.sa
.sa_family
== AF_INET6
) {
395 struct in6_ifreq ifr6
;
397 memcpy((char *) &ifr6
.ifr6_addr
,
398 (char *) &(lsa
->u
.sin6
.sin6_addr
),
399 sizeof(struct in6_addr
));
401 /* Create a channel to the NET kernel. */
402 sockfd6
= xsocket(AF_INET6
, SOCK_DGRAM
, 0);
403 xioctl(sockfd6
, SIOGIFINDEX
, &ifr
);
404 ifr6
.ifr6_ifindex
= ifr
.ifr_ifindex
;
405 ifr6
.ifr6_prefixlen
= prefix_len
;
406 ioctl_or_perror_and_die(sockfd6
, a1op
->selector
, &ifr6
, "SIOC%s", a1op
->name
);
407 if (ENABLE_FEATURE_CLEAN_UP
)
412 sai
.sin_addr
= lsa
->u
.sin
.sin_addr
;
413 if (ENABLE_FEATURE_CLEAN_UP
)
416 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
417 if (mask
& A_HOSTNAME
)
418 sai_hostname
= sai
.sin_addr
.s_addr
;
419 if (mask
& A_NETMASK
)
420 sai_netmask
= sai
.sin_addr
.s_addr
;
423 #if ENABLE_FEATURE_IFCONFIG_HW
424 } else { /* A_CAST_HOST_COPY_IN_ETHER */
425 /* This is the "hw" arg case. */
426 smalluint hw_class
= index_in_substrings("ether\0"
427 USE_FEATURE_HWIB("infiniband\0"), *argv
) + 1;
428 if (!hw_class
|| !*++argv
)
430 /*safe_strncpy(host, *argv, sizeof(host));*/
432 if (hw_class
== 1 ? in_ether(host
, &sa
) : in_ib(host
, &sa
))
433 bb_error_msg_and_die("invalid hw-addr %s", host
);
437 memcpy( (((char *)&ifr
) + a1op
->ifr_offset
),
438 p
, sizeof(struct sockaddr
));
440 /* FIXME: error check?? */
441 unsigned long i
= strtoul(*argv
, NULL
, 0);
442 p
= ((char *)&ifr
) + a1op
->ifr_offset
;
443 #if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
444 if (mask
& A_MAP_TYPE
) {
445 xioctl(sockfd
, SIOCGIFMAP
, &ifr
);
446 if ((mask
& A_MAP_UCHAR
) == A_MAP_UCHAR
)
447 *((unsigned char *) p
) = i
;
448 else if (mask
& A_MAP_USHORT
)
449 *((unsigned short *) p
) = i
;
451 *((unsigned long *) p
) = i
;
454 if (mask
& A_CAST_CHAR_PTR
)
455 *((caddr_t
*) p
) = (caddr_t
) i
;
456 else /* A_CAST_INT */
460 ioctl_or_perror_and_die(sockfd
, a1op
->selector
, &ifr
, "SIOC%s", a1op
->name
);
461 #ifdef QUESTIONABLE_ALIAS_CASE
462 if (mask
& A_COLON_CHK
) {
464 * Don't do the set_flag() if the address is an alias with
465 * a '-' at the end, since it's deleted already! - Roman
467 * Should really use regex.h here, not sure though how well
468 * it'll go with the cross-platform support etc.
471 short int found_colon
= 0;
472 for (ptr
= ifr
.ifr_name
; *ptr
; ptr
++)
475 if (found_colon
&& ptr
[-1] == '-')
480 if (!(mask
& A_SET_AFTER
))
485 xioctl(sockfd
, SIOCGIFFLAGS
, &ifr
);
486 selector
= op
->selector
;
488 ifr
.ifr_flags
|= selector
;
490 ifr
.ifr_flags
&= ~selector
;
491 xioctl(sockfd
, SIOCSIFFLAGS
, &ifr
);
494 if (ENABLE_FEATURE_CLEAN_UP
)
499 #if ENABLE_FEATURE_IFCONFIG_HW
500 /* Input an Ethernet address and convert to binary. */
501 static int in_ether(const char *bufp
, struct sockaddr
*sap
)
508 sap
->sa_family
= ARPHRD_ETHER
;
509 ptr
= (char *) sap
->sa_data
;
515 /* We might get a semicolon here - not required. */
516 if (i
&& (*bufp
== ':')) {
522 if (((unsigned char)(c
- '0')) <= 9) {
524 } else if (((unsigned char)((c
|0x20) - 'a')) <= 5) {
525 c
= (c
|0x20) - ('a'-10);
526 } else if (j
&& (c
== ':' || c
== 0)) {
536 } while (++i
< ETH_ALEN
);
538 return *bufp
; /* Error if we don't end at end of string. */