1/* vi: set sw=4 ts=4: */ 2/* ifconfig 3 * 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). 6 * 7 * Bjorn Wesen, Axis Communications AB 8 * 9 * 10 * Authors of the original ifconfig was: 11 * Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org> 12 * 13 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. 14 */ 15 16/* 17 * Heavily modified by Manuel Novoa III Mar 6, 2001 18 * 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. 22 * 23 * Still missing: media, tunnel. 24 * 25 * 2002-04-20 26 * IPV6 support added by Bart Visscher <magick@linux-fan.com> 27 */ 28 29#include <net/if.h> 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> 35#else 36#include <sys/types.h> 37#include <netinet/if_ether.h> 38#endif 39#include "inet_common.h" 40#include "libbb.h" 41 42#if ENABLE_FEATURE_IFCONFIG_SLIP 43# include <net/if_slip.h> 44#endif 45 46/* I don't know if this is needed for busybox or not. Anyone? */ 47#define QUESTIONABLE_ALIAS_CASE 48 49 50/* Defines for glibc2.0 users. */ 51#ifndef SIOCSIFTXQLEN 52# define SIOCSIFTXQLEN 0x8943 53# define SIOCGIFTXQLEN 0x8942 54#endif 55 56/* ifr_qlen is ifru_ivalue, but it isn't present in 2.0 kernel headers */ 57#ifndef ifr_qlen 58# define ifr_qlen ifr_ifru.ifru_mtu 59#endif 60 61#ifndef IFF_DYNAMIC 62# define IFF_DYNAMIC 0x8000 /* dialup device with changing addresses */ 63#endif 64 65#if ENABLE_FEATURE_IPV6 66struct in6_ifreq { 67 struct in6_addr ifr6_addr; 68 uint32_t ifr6_prefixlen; 69 int ifr6_ifindex; 70}; 71#endif 72 73/* 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. 77 */ 78#define N_CLR 0x01 79#define M_CLR 0x02 80#define N_SET 0x04 81#define M_SET 0x08 82#define N_ARG 0x10 83#define M_ARG 0x20 84 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) 91 92/* 93 * Here are the bit masks for the "arg_flags" member of struct options below. 94 */ 95 96/* 97 * cast type: 98 * 00 int 99 * 01 char * 100 * 02 HOST_COPY in_ether 101 * 03 HOST_COPY INET_resolve 102 */ 103#define A_CAST_TYPE 0x03 104/* 105 * map type: 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) 110 */ 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. */ 119#else 120#define A_HOSTNAME 0 121#define A_BROADCAST 0 122#endif 123 124/* 125 * These defines are for dealing with the A_CAST_TYPE field. 126 */ 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) 132 133/* 134 * These defines are for dealing with the A_MAP_TYPE field. 135 */ 136#define A_MAP_ULONG 0x04 /* memstart */ 137#define A_MAP_USHORT 0x08 /* io_addr */ 138#define A_MAP_UCHAR 0x0C /* irq */ 139 140/* 141 * Define the bit masks signifying which operations to perform for each arg. 142 */ 143 144#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) 159 160 161/* 162 * Set up the tables. Warning! They must have corresponding order! 163 */ 164 165struct arg1opt { 166 const char *name; 167 int selector; 168 unsigned short ifr_offset; 169}; 170 171struct options { 172 const char *name; 173#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS 174 const unsigned int flags:6; 175 const unsigned int arg_flags:10; 176#else 177 const unsigned char flags; 178 const unsigned char arg_flags; 179#endif 180 const unsigned short selector; 181}; 182 183#define ifreq_offsetof(x) offsetof(struct ifreq, x) 184 185static 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)}, 194#endif 195 {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)}, 196#ifdef SIOCSKEEPALIVE 197 {"SIOCSKEEPALIVE", SIOCSKEEPALIVE, ifreq_offsetof(ifr_data)}, 198#endif 199#ifdef SIOCSOUTFILL 200 {"SIOCSOUTFILL", SIOCSOUTFILL, ifreq_offsetof(ifr_data)}, 201#endif 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)}, 206#endif 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 */ 211#endif 212 {"SIOCSIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr)}, 213}; 214 215static 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}, 224#endif 225 {"pointopoint", N_ARG | M_CLR, ARG_POINTOPOINT, IFF_POINTOPOINT}, 226#ifdef SIOCSKEEPALIVE 227 {"keepalive", N_ARG, ARG_KEEPALIVE, 0}, 228#endif 229#ifdef SIOCSOUTFILL 230 {"outfill", N_ARG, ARG_OUTFILL, 0}, 231#endif 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}, 236#endif 237#if ENABLE_FEATURE_IPV6 238 {"add", N_ARG, ARG_ADD_DEL, 0}, 239 {"del", N_ARG, ARG_ADD_DEL, 0}, 240#endif 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)} 250}; 251 252/* 253 * A couple of prototypes. 254 */ 255 256#if ENABLE_FEATURE_IFCONFIG_HW 257static int in_ether(const char *bufp, struct sockaddr *sap); 258#endif 259 260/* 261 * Our main function. 262 */ 263 264int ifconfig_main(int argc, char **argv); 265int ifconfig_main(int argc, char **argv) 266{ 267 struct ifreq ifr; 268 struct sockaddr_in sai; 269#if ENABLE_FEATURE_IFCONFIG_HW 270 struct sockaddr sa; 271#endif 272 const struct arg1opt *a1op; 273 const struct options *op; 274 int sockfd; /* socket fd we use to manipulate stuff with */ 275 int selector; 276#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS 277 unsigned int mask; 278 unsigned int did_flags; 279 unsigned int sai_hostname, sai_netmask; 280#else 281 unsigned char mask; 282 unsigned char did_flags; 283#endif 284 char *p; 285 /*char host[128];*/ 286 const char *host = NULL; /* make gcc happy */ 287 288 did_flags = 0; 289#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS 290 sai_hostname = 0; 291 sai_netmask = 0; 292#endif 293 294 /* skip argv[0] */ 295 ++argv; 296 --argc; 297 298#if ENABLE_FEATURE_IFCONFIG_STATUS 299 if (argc > 0 && (argv[0][0] == '-' && argv[0][1] == 'a' && !argv[0][2])) { 300 interface_opt_a = 1; 301 --argc; 302 ++argv; 303 } 304#endif 305 306 if (argc <= 1) { 307#if ENABLE_FEATURE_IFCONFIG_STATUS 308 return display_interfaces(argc ? *argv : NULL); 309#else 310 bb_error_msg_and_die("no support for status display"); 311#endif 312 } 313 314 /* Create a channel to the NET kernel. */ 315 sockfd = xsocket(AF_INET, SOCK_DGRAM, 0); 316 317 /* get interface name */ 318 safe_strncpy(ifr.ifr_name, *argv, IFNAMSIZ); 319 320 /* Process the remaining arguments. */ 321 while (*++argv != (char *) NULL) { 322 p = *argv; 323 mask = N_MASK; 324 if (*p == '-') { /* If the arg starts with '-'... */ 325 ++p; /* advance past it and */ 326 mask = M_MASK; /* set the appropriate mask. */ 327 } 328 for (op = OptArray; op->name; op++) { /* Find table entry. */ 329 if (strcmp(p, op->name) == 0) { /* If name matches... */ 330 mask &= op->flags; 331 if (mask) /* set the mask and go. */ 332 goto FOUND_ARG; 333 /* If we get here, there was a valid arg with an */ 334 /* invalid '-' prefix. */ 335 bb_error_msg_and_die("bad: '%s'", p-1); 336 } 337 } 338 339 /* We fell through, so treat as possible hostname. */ 340 a1op = Arg1Opt + ARRAY_SIZE(Arg1Opt) - 1; 341 mask = op->arg_flags; 342 goto HOSTNAME; 343 344 FOUND_ARG: 345 if (mask & ARG_MASK) { 346 mask = op->arg_flags; 347 a1op = Arg1Opt + (op - OptArray); 348 if (mask & A_NETMASK & did_flags) 349 bb_show_usage(); 350 if (*++argv == NULL) { 351 if (mask & A_ARG_REQ) 352 bb_show_usage(); 353 --argv; 354 mask &= A_SET_AFTER; /* just for broadcast */ 355 } else { /* got an arg so process it */ 356 HOSTNAME: 357 did_flags |= (mask & (A_NETMASK|A_HOSTNAME)); 358 if (mask & A_CAST_HOST_COPY) { 359#if ENABLE_FEATURE_IFCONFIG_HW 360 if (mask & A_CAST_RESOLVE) { 361#endif 362#if ENABLE_FEATURE_IPV6 363 char *prefix; 364 int prefix_len = 0; 365#endif 366 /*safe_strncpy(host, *argv, (sizeof host));*/ 367 host = *argv; 368#if ENABLE_FEATURE_IPV6 369 prefix = strchr(host, '/'); 370 if (prefix) { 371 prefix_len = xatou_range(prefix + 1, 0, 128); 372 *prefix = '\0'; 373 } 374#endif 375 sai.sin_family = AF_INET; 376 sai.sin_port = 0; 377 if (!strcmp(host, bb_str_default)) { 378 /* Default is special, meaning 0.0.0.0. */ 379 sai.sin_addr.s_addr = INADDR_ANY; 380 } 381#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS 382 else if ((host[0] == '+' && !host[1]) && (mask & A_BROADCAST) 383 && (did_flags & (A_NETMASK|A_HOSTNAME)) == (A_NETMASK|A_HOSTNAME) 384 ) { 385 /* + is special, meaning broadcast is derived. */ 386 sai.sin_addr.s_addr = (~sai_netmask) | (sai_hostname & sai_netmask); 387 } 388#endif 389 else { 390 len_and_sockaddr *lsa; 391 if (strcmp(host, "inet") == 0) 392 continue; /* compat stuff */ 393 lsa = xhost2sockaddr(host, 0); 394#if ENABLE_FEATURE_IPV6 395 if (lsa->sa.sa_family == AF_INET6) { 396 int sockfd6; 397 struct in6_ifreq ifr6; 398 399 memcpy((char *) &ifr6.ifr6_addr, 400 (char *) &(lsa->sin6.sin6_addr), 401 sizeof(struct in6_addr)); 402 403 /* Create a channel to the NET kernel. */ 404 sockfd6 = xsocket(AF_INET6, SOCK_DGRAM, 0); 405 xioctl(sockfd6, SIOGIFINDEX, &ifr); 406 ifr6.ifr6_ifindex = ifr.ifr_ifindex; 407 ifr6.ifr6_prefixlen = prefix_len; 408 ioctl_or_perror_and_die(sockfd6, a1op->selector, &ifr6, "%s", a1op->name); 409 if (ENABLE_FEATURE_CLEAN_UP) 410 free(lsa); 411 continue; 412 } 413#endif 414 sai.sin_addr = lsa->sin.sin_addr; 415 if (ENABLE_FEATURE_CLEAN_UP) 416 free(lsa); 417 } 418#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS 419 if (mask & A_HOSTNAME) 420 sai_hostname = sai.sin_addr.s_addr; 421 if (mask & A_NETMASK) 422 sai_netmask = sai.sin_addr.s_addr; 423#endif 424 p = (char *) &sai; 425#if ENABLE_FEATURE_IFCONFIG_HW 426 } else { /* A_CAST_HOST_COPY_IN_ETHER */ 427 /* This is the "hw" arg case. */ 428 if (strcmp("ether", *argv) || !*++argv) 429 bb_show_usage(); 430 /*safe_strncpy(host, *argv, sizeof(host));*/ 431 host = *argv; 432 if (in_ether(host, &sa)) 433 bb_error_msg_and_die("invalid hw-addr %s", host); 434 p = (char *) &sa; 435 } 436#endif 437 memcpy( (((char *)&ifr) + a1op->ifr_offset), 438 p, sizeof(struct sockaddr)); 439 } else { 440 unsigned long i = strtoul(*argv, NULL, 0); 441 p = ((char *)&ifr) + a1op->ifr_offset; 442#if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ 443 if (mask & A_MAP_TYPE) { 444 xioctl(sockfd, SIOCGIFMAP, &ifr); 445 if ((mask & A_MAP_UCHAR) == A_MAP_UCHAR) 446 *((unsigned char *) p) = i; 447 else if (mask & A_MAP_USHORT) 448 *((unsigned short *) p) = i; 449 else 450 *((unsigned long *) p) = i; 451 } else 452#endif 453 if (mask & A_CAST_CHAR_PTR) 454 *((caddr_t *) p) = (caddr_t) i; 455 else /* A_CAST_INT */ 456 *((int *) p) = i; 457 } 458 459 ioctl_or_perror_and_die(sockfd, a1op->selector, &ifr, "%s", a1op->name); 460#ifdef QUESTIONABLE_ALIAS_CASE 461 if (mask & A_COLON_CHK) { 462 /* 463 * Don't do the set_flag() if the address is an alias with 464 * a '-' at the end, since it's deleted already! - Roman 465 * 466 * Should really use regex.h here, not sure though how well 467 * it'll go with the cross-platform support etc. 468 */ 469 char *ptr; 470 short int found_colon = 0; 471 for (ptr = ifr.ifr_name; *ptr; ptr++) 472 if (*ptr == ':') 473 found_colon++; 474 if (found_colon && ptr[-1] == '-') 475 continue; 476 } 477#endif 478 } 479 if (!(mask & A_SET_AFTER)) 480 continue; 481 mask = N_SET; 482 } 483 484 xioctl(sockfd, SIOCGIFFLAGS, &ifr); 485 selector = op->selector; 486 if (mask & SET_MASK) 487 ifr.ifr_flags |= selector; 488 else 489 ifr.ifr_flags &= ~selector; 490 xioctl(sockfd, SIOCSIFFLAGS, &ifr); 491 } /* while () */ 492 493 if (ENABLE_FEATURE_CLEAN_UP) 494 close(sockfd); 495 return 0; 496} 497 498#if ENABLE_FEATURE_IFCONFIG_HW 499/* Input an Ethernet address and convert to binary. */ 500static int in_ether(const char *bufp, struct sockaddr *sap) 501{ 502 char *ptr; 503 int i, j; 504 unsigned char val; 505 unsigned char c; 506 507 sap->sa_family = ARPHRD_ETHER; 508 ptr = sap->sa_data; 509 510 i = 0; 511 do { 512 j = val = 0; 513 514 /* We might get a semicolon here - not required. */ 515 if (i && (*bufp == ':')) { 516 bufp++; 517 } 518 519 do { 520 c = *bufp; 521 if (((unsigned char)(c - '0')) <= 9) { 522 c -= '0'; 523 } else if (((unsigned char)((c|0x20) - 'a')) <= 5) { 524 c = (c|0x20) - ('a'-10); 525 } else if (j && (c == ':' || c == 0)) { 526 break; 527 } else { 528 return -1; 529 } 530 ++bufp; 531 val <<= 4; 532 val += c; 533 } while (++j < 2); 534 *ptr++ = val; 535 } while (++i < ETH_ALEN); 536 537 return *bufp; /* Error if we don't end at end of string. */ 538} 539#endif 540