aboutsummaryrefslogtreecommitdiff
path: root/ifconfig.c
diff options
context:
space:
mode:
Diffstat (limited to 'ifconfig.c')
-rw-r--r--ifconfig.c492
1 files changed, 0 insertions, 492 deletions
diff --git a/ifconfig.c b/ifconfig.c
deleted file mode 100644
index c77ea04b1..000000000
--- a/ifconfig.c
+++ /dev/null
@@ -1,492 +0,0 @@
1/* ifconfig
2 *
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).
5 *
6 * Bjorn Wesen, Axis Communications AB
7 *
8 *
9 * Authors of the original ifconfig was:
10 * Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
11 *
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.
17 *
18 * $Id: ifconfig.c,v 1.12 2001/08/10 06:02:23 mjn3 Exp $
19 *
20 */
21
22/*
23 * Heavily modified by Manuel Novoa III Mar 6, 2001
24 *
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.
28 *
29 * Still missing: media, tunnel.
30 */
31
32#include <stdio.h>
33#include <stdlib.h>
34#include <string.h> // strcmp and friends
35#include <ctype.h> // isdigit and friends
36#include <stddef.h> /* offsetof */
37#include <sys/types.h>
38#include <sys/socket.h>
39#include <sys/ioctl.h>
40#include <netinet/in.h>
41#include <arpa/inet.h>
42#include <net/if.h>
43#include <net/if_arp.h>
44#include <linux/if_ether.h>
45#include "busybox.h"
46
47#ifdef BB_FEATURE_IFCONFIG_SLIP
48#include <linux/if_slip.h>
49#endif
50
51/* I don't know if this is needed for busybox or not. Anyone? */
52#define QUESTIONABLE_ALIAS_CASE
53
54
55/* Defines for glibc2.0 users. */
56#ifndef SIOCSIFTXQLEN
57#define SIOCSIFTXQLEN 0x8943
58#define SIOCGIFTXQLEN 0x8942
59#endif
60
61/* ifr_qlen is ifru_ivalue, but it isn't present in 2.0 kernel headers */
62#ifndef ifr_qlen
63#define ifr_qlen ifr_ifru.ifru_mtu
64#endif
65
66#ifndef IFF_DYNAMIC
67#define IFF_DYNAMIC 0x8000 /* dialup device with changing addresses */
68#endif
69
70/*
71 * Here are the bit masks for the "flags" member of struct options below.
72 * N_ signifies no arg prefix; M_ signifies arg prefixed by '-'.
73 * CLR clears the flag; SET sets the flag; ARG signifies (optional) arg.
74 */
75#define N_CLR 0x01
76#define M_CLR 0x02
77#define N_SET 0x04
78#define M_SET 0x08
79#define N_ARG 0x10
80#define M_ARG 0x20
81
82#define M_MASK (M_CLR | M_SET | M_ARG)
83#define N_MASK (N_CLR | N_SET | N_ARG)
84#define SET_MASK (N_SET | M_SET)
85#define CLR_MASK (N_CLR | M_CLR)
86#define SET_CLR_MASK (SET_MASK | CLR_MASK)
87#define ARG_MASK (M_ARG | N_ARG)
88
89/*
90 * Here are the bit masks for the "arg_flags" member of struct options below.
91 */
92
93/*
94 * cast type:
95 * 00 int
96 * 01 char *
97 * 02 HOST_COPY in_ether
98 * 03 HOST_COPY INET_resolve
99 */
100#define A_CAST_TYPE 0x03
101/*
102 * map type:
103 * 00 not a map type (mem_start, io_addr, irq)
104 * 04 memstart (unsigned long)
105 * 08 io_addr (unsigned short)
106 * 0C irq (unsigned char)
107 */
108#define A_MAP_TYPE 0x0C
109#define A_ARG_REQ 0x10 /* Set if an arg is required. */
110#define A_NETMASK 0x20 /* Set if netmask (check for multiple sets). */
111#define A_SET_AFTER 0x40 /* Set a flag at the end. */
112#define A_COLON_CHK 0x80 /* Is this needed? See below. */
113
114/*
115 * These defines are for dealing with the A_CAST_TYPE field.
116 */
117#define A_CAST_CHAR_PTR 0x01
118#define A_CAST_RESOLVE 0x01
119#define A_CAST_HOST_COPY 0x02
120#define A_CAST_HOST_COPY_IN_ETHER A_CAST_HOST_COPY
121#define A_CAST_HOST_COPY_RESOLVE (A_CAST_HOST_COPY | A_CAST_RESOLVE)
122
123/*
124 * These defines are for dealing with the A_MAP_TYPE field.
125 */
126#define A_MAP_ULONG 0x04 /* memstart */
127#define A_MAP_USHORT 0x08 /* io_addr */
128#define A_MAP_UCHAR 0x0C /* irq */
129
130/*
131 * Define the bit masks signifying which operations to perform for each arg.
132 */
133
134#define ARG_METRIC (A_ARG_REQ /*| A_CAST_INT*/)
135#define ARG_MTU (A_ARG_REQ /*| A_CAST_INT*/)
136#define ARG_TXQUEUELEN (A_ARG_REQ /*| A_CAST_INT*/)
137#define ARG_MEM_START (A_ARG_REQ | A_MAP_ULONG)
138#define ARG_IO_ADDR (A_ARG_REQ | A_MAP_USHORT)
139#define ARG_IRQ (A_ARG_REQ | A_MAP_UCHAR)
140#define ARG_DSTADDR (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE)
141#define ARG_NETMASK (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_NETMASK)
142#define ARG_BROADCAST (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
143#define ARG_HW (A_ARG_REQ | A_CAST_HOST_COPY_IN_ETHER)
144#define ARG_POINTOPOINT (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
145#define ARG_KEEPALIVE (A_ARG_REQ | A_CAST_CHAR_PTR)
146#define ARG_OUTFILL (A_ARG_REQ | A_CAST_CHAR_PTR)
147#define ARG_HOSTNAME (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_COLON_CHK)
148
149
150/*
151 * Set up the tables. Warning! They must have corresponding order!
152 */
153
154struct arg1opt {
155 const char *name;
156 unsigned short selector;
157 unsigned short ifr_offset;
158};
159
160struct options {
161 const char *name;
162 const unsigned char flags;
163 const unsigned char arg_flags;
164 const unsigned short selector;
165};
166
167#define ifreq_offsetof(x) offsetof(struct ifreq, x)
168
169static const struct arg1opt Arg1Opt[] = {
170 {"SIOCSIFMETRIC", SIOCSIFMETRIC, ifreq_offsetof(ifr_metric)},
171 {"SIOCSIFMTU", SIOCSIFMTU, ifreq_offsetof(ifr_mtu)},
172 {"SIOCSIFTXQLEN", SIOCSIFTXQLEN, ifreq_offsetof(ifr_qlen)},
173 {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
174 {"SIOCSIFNETMASK", SIOCSIFNETMASK, ifreq_offsetof(ifr_netmask)},
175 {"SIOCSIFBRDADDR", SIOCSIFBRDADDR, ifreq_offsetof(ifr_broadaddr)},
176#ifdef BB_FEATURE_IFCONFIG_HW
177 {"SIOCSIFHWADDR", SIOCSIFHWADDR, ifreq_offsetof(ifr_hwaddr)},
178#endif
179 {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
180#ifdef SIOCSKEEPALIVE
181 {"SIOCSKEEPALIVE", SIOCSKEEPALIVE, ifreq_offsetof(ifr_data)},
182#endif
183#ifdef SIOCSOUTFILL
184 {"SIOCSOUTFILL", SIOCSOUTFILL, ifreq_offsetof(ifr_data)},
185#endif
186#ifdef BB_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
187 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.mem_start)},
188 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.base_addr)},
189 {"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.irq)},
190#endif
191 /* Last entry if for unmatched (possibly hostname) arg. */
192 {"SIOCSIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr)},
193};
194
195static const struct options OptArray[] = {
196 {"metric", N_ARG, ARG_METRIC, 0},
197 {"mtu", N_ARG, ARG_MTU, 0},
198 {"txqueuelen", N_ARG, ARG_TXQUEUELEN, 0},
199 {"dstaddr", N_ARG, ARG_DSTADDR, 0},
200 {"netmask", N_ARG, ARG_NETMASK, 0},
201 {"broadcast", N_ARG | M_CLR, ARG_BROADCAST, IFF_BROADCAST},
202#ifdef BB_FEATURE_IFCONFIG_HW
203 {"hw", N_ARG, ARG_HW, 0},
204#endif
205 {"pointopoint", N_ARG | M_CLR, ARG_POINTOPOINT, IFF_POINTOPOINT},
206#ifdef SIOCSKEEPALIVE
207 {"keepalive", N_ARG, ARG_KEEPALIVE, 0},
208#endif
209#ifdef SIOCSOUTFILL
210 {"outfill", N_ARG, ARG_OUTFILL, 0},
211#endif
212#ifdef BB_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
213 {"mem_start", N_ARG, ARG_MEM_START, 0},
214 {"io_addr", N_ARG, ARG_IO_ADDR, 0},
215 {"irq", N_ARG, ARG_IRQ, 0},
216#endif
217 {"arp", N_CLR | M_SET, 0, IFF_NOARP},
218 {"trailers", N_CLR | M_SET, 0, IFF_NOTRAILERS},
219 {"promisc", N_SET | M_CLR, 0, IFF_PROMISC},
220 {"multicast", N_SET | M_CLR, 0, IFF_MULTICAST},
221 {"allmulti", N_SET | M_CLR, 0, IFF_ALLMULTI},
222 {"dynamic", N_SET | M_CLR, 0, IFF_DYNAMIC},
223 {"up", N_SET , 0, (IFF_UP | IFF_RUNNING)},
224 {"down", N_CLR , 0, IFF_UP},
225 { NULL, 0, ARG_HOSTNAME, (IFF_UP | IFF_RUNNING)}
226};
227
228/*
229 * A couple of prototypes.
230 */
231
232#ifdef BB_FEATURE_IFCONFIG_HW
233static int in_ether(char *bufp, struct sockaddr *sap);
234#endif
235
236#ifdef BB_FEATURE_IFCONFIG_STATUS
237extern int interface_opt_a;
238extern int display_interfaces(char *ifname);
239#endif
240
241/*
242 * Our main function.
243 */
244
245int ifconfig_main(int argc, char **argv)
246{
247 struct ifreq ifr;
248 struct sockaddr_in sai;
249#ifdef BB_FEATURE_IFCONFIG_HW
250 struct sockaddr sa;
251#endif
252 const struct arg1opt *a1op;
253 const struct options *op;
254 int sockfd; /* socket fd we use to manipulate stuff with */
255 int goterr;
256 int selector;
257 char *p;
258 char host[128];
259 unsigned char mask;
260 unsigned char did_flags;
261
262 goterr = 0;
263 did_flags = 0;
264
265 /* skip argv[0] */
266 ++argv;
267 --argc;
268
269#ifdef BB_FEATURE_IFCONFIG_STATUS
270 if ((argc > 0) && (strcmp(*argv,"-a") == 0)) {
271 interface_opt_a = 1;
272 --argc;
273 ++argv;
274 }
275#endif
276
277 if(argc <= 1) {
278#ifdef BB_FEATURE_IFCONFIG_STATUS
279 return display_interfaces(argc ? *argv : NULL);
280#else
281 error_msg_and_die( "ifconfig was not compiled with interface status display support.");
282#endif
283 }
284
285 /* Create a channel to the NET kernel. */
286 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
287 perror_msg_and_die("socket");
288 }
289
290 /* get interface name */
291 safe_strncpy(ifr.ifr_name, *argv, IFNAMSIZ);
292
293 /* Process the remaining arguments. */
294 while (*++argv != (char *) NULL) {
295 p = *argv;
296 mask = N_MASK;
297 if (*p == '-') { /* If the arg starts with '-'... */
298 ++p; /* advance past it and */
299 mask = M_MASK; /* set the appropriate mask. */
300 }
301 for (op = OptArray ; op->name ; op++) { /* Find table entry. */
302 if (strcmp(p,op->name) == 0) { /* If name matches... */
303 if ((mask &= op->flags)) { /* set the mask and go. */
304 goto FOUND_ARG;;
305 }
306 /* If we get here, there was a valid arg with an */
307 /* invalid '-' prefix. */
308 ++goterr;
309 goto LOOP;
310 }
311 }
312
313 /* We fell through, so treat as possible hostname. */
314 a1op = Arg1Opt + (sizeof(Arg1Opt) / sizeof(Arg1Opt[0])) - 1;
315 mask = op->arg_flags;
316 goto HOSTNAME;
317
318 FOUND_ARG:
319 if (mask & ARG_MASK) {
320 mask = op->arg_flags;
321 a1op = Arg1Opt + (op - OptArray);
322 if (mask & A_NETMASK & did_flags) {
323 show_usage();
324 }
325 if (*++argv == NULL) {
326 if (mask & A_ARG_REQ) {
327 show_usage();
328 } else {
329 --argv;
330 mask &= A_SET_AFTER; /* just for broadcast */
331 }
332 } else { /* got an arg so process it */
333 HOSTNAME:
334 did_flags |= (mask & A_NETMASK);
335 if (mask & A_CAST_HOST_COPY) {
336#ifdef BB_FEATURE_IFCONFIG_HW
337 if (mask & A_CAST_RESOLVE) {
338#endif
339 safe_strncpy(host, *argv, (sizeof host));
340 sai.sin_family = AF_INET;
341 sai.sin_port = 0;
342 if (!strcmp(host, "default")) {
343 /* Default is special, meaning 0.0.0.0. */
344 sai.sin_addr.s_addr = INADDR_ANY;
345 } else if (inet_aton(host, &sai.sin_addr) == 0) {
346 /* It's not a dotted quad. */
347 ++goterr;
348 continue;
349 }
350 p = (char *) &sai;
351#ifdef BB_FEATURE_IFCONFIG_HW
352 } else { /* A_CAST_HOST_COPY_IN_ETHER */
353 /* This is the "hw" arg case. */
354 if (strcmp("ether", *argv) || (*++argv == NULL)) {
355 show_usage();
356 }
357 safe_strncpy(host, *argv, (sizeof host));
358 if (in_ether(host, &sa)) {
359 fprintf(stderr, "invalid hw-addr %s\n", host);
360 ++goterr;
361 continue;
362 }
363 p = (char *) &sa;
364 }
365#endif
366 memcpy((((char *)(&ifr)) + a1op->ifr_offset),
367 p, sizeof(struct sockaddr));
368 } else {
369 unsigned int i = strtoul(*argv,NULL,0);
370 p = ((char *)(&ifr)) + a1op->ifr_offset;
371#ifdef BB_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
372 if (mask & A_MAP_TYPE) {
373 if (ioctl(sockfd, SIOCGIFMAP, &ifr) < 0) {
374 ++goterr;
375 continue;
376 }
377 if ((mask & A_MAP_UCHAR) == A_MAP_UCHAR) {
378 *((unsigned char *) p) = i;
379 } else if (mask & A_MAP_USHORT) {
380 *((unsigned short *) p) = i;
381 } else {
382 *((unsigned long *) p) = i;
383 }
384 } else
385#endif
386 if (mask & A_CAST_CHAR_PTR) {
387 *((caddr_t *) p) = (caddr_t) i;
388 } else { /* A_CAST_INT */
389 *((int *) p) = i;
390 }
391 }
392
393 if (ioctl(sockfd, a1op->selector, &ifr) < 0) {
394 perror(a1op->name);
395 ++goterr;
396 continue;
397 }
398
399#ifdef QUESTIONABLE_ALIAS_CASE
400 if (mask & A_COLON_CHK) {
401 /*
402 * Don't do the set_flag() if the address is an alias with
403 * a - at the end, since it's deleted already! - Roman
404 *
405 * Should really use regex.h here, not sure though how well
406 * it'll go with the cross-platform support etc.
407 */
408 char *ptr;
409 short int found_colon = 0;
410 for (ptr = ifr.ifr_name; *ptr; ptr++ ) {
411 if (*ptr == ':') {
412 found_colon++;
413 }
414 }
415
416 if (found_colon && *(ptr - 1) == '-') {
417 continue;
418 }
419 }
420#endif
421 }
422 if (!(mask & A_SET_AFTER)) {
423 continue;
424 }
425 mask = N_SET;
426 }
427
428 if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
429 perror("SIOCGIFFLAGS");
430 ++goterr;
431 } else {
432 selector = op->selector;
433 if (mask & SET_MASK) {
434 ifr.ifr_flags |= selector;
435 } else {
436 ifr.ifr_flags &= ~selector;
437 }
438 if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
439 perror("SIOCSIFFLAGS");
440 ++goterr;
441 }
442 }
443 LOOP:
444 } /* end of while-loop */
445
446 return goterr;
447}
448
449#ifdef BB_FEATURE_IFCONFIG_HW
450/* Input an Ethernet address and convert to binary. */
451static int
452in_ether(char *bufp, struct sockaddr *sap)
453{
454 unsigned char *ptr;
455 int i, j;
456 unsigned char val;
457 unsigned char c;
458
459 sap->sa_family = ARPHRD_ETHER;
460 ptr = sap->sa_data;
461
462 for (i = 0 ; i < ETH_ALEN ; i++) {
463 val = 0;
464
465 /* We might get a semicolon here - not required. */
466 if (i && (*bufp == ':')) {
467 bufp++;
468 }
469
470 for (j=0 ; j<2 ; j++) {
471 c = *bufp;
472 if (c >= '0' && c <= '9') {
473 c -= '0';
474 } else if (c >= 'a' && c <= 'f') {
475 c -= ('a' - 10);
476 } else if (c >= 'A' && c <= 'F') {
477 c -= ('A' - 10);
478 } else if (j && (c == ':' || c == 0)) {
479 break;
480 } else {
481 return -1;
482 }
483 ++bufp;
484 val <<= 4;
485 val += c;
486 }
487 *ptr++ = val;
488 }
489
490 return (int) (*bufp); /* Error if we don't end at end of string. */
491}
492#endif
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-08-13 05:28:41 +0000