networking/ifconfig.c

   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 1.23 2003/03/19 09:12:38 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  * 2002-04-20
  32  * IPV6 support added by Bart Visscher <magick@linux-fan.com>
  33  */
  34
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <string.h>             /* strcmp and friends */
  38 #include <ctype.h>              /* isdigit and friends */
  39 #include <stddef.h>             /* offsetof */
  40 #include <sys/ioctl.h>
  41 #include <net/if.h>
  42 #include <net/if_arp.h>
  43 #include <netinet/in.h>
  44 #if __GLIBC__ >=2 && __GLIBC_MINOR >= 1
  45 #include <netpacket/packet.h>
  46 #include <net/ethernet.h>
  47 #else
  48 #include <asm/types.h>
  49 #include <linux/if_ether.h>
  50 #endif
  51 #include "inet_common.h"
  52 #include "busybox.h"
  53
  54 #ifdef CONFIG_FEATURE_IFCONFIG_SLIP
  55 # include <net/if_slip.h>
  56 #endif
  57
  58 /* I don't know if this is needed for busybox or not.  Anyone? */
  59 #define QUESTIONABLE_ALIAS_CASE
  60
  61
  62 /* Defines for glibc2.0 users. */
  63 #ifndef SIOCSIFTXQLEN
  64 # define SIOCSIFTXQLEN      0x8943
  65 # define SIOCGIFTXQLEN      0x8942
  66 #endif
  67
  68 /* ifr_qlen is ifru_ivalue, but it isn't present in 2.0 kernel headers */
  69 #ifndef ifr_qlen
  70 # define ifr_qlen        ifr_ifru.ifru_mtu
  71 #endif
  72
  73 #ifndef IFF_DYNAMIC
  74 # define IFF_DYNAMIC     0x8000 /* dialup device with changing addresses */
  75 #endif
  76
  77 #ifdef CONFIG_FEATURE_IPV6
  78 struct in6_ifreq {
  79         struct in6_addr ifr6_addr;
  80         uint32_t ifr6_prefixlen;
  81         int ifr6_ifindex;
  82 };
  83 #endif
  84
  85 /*
  86  * Here are the bit masks for the "flags" member of struct options below.
  87  * N_ signifies no arg prefix; M_ signifies arg prefixed by '-'.
  88  * CLR clears the flag; SET sets the flag; ARG signifies (optional) arg.
  89  */
  90 #define N_CLR            0x01
  91 #define M_CLR            0x02
  92 #define N_SET            0x04
  93 #define M_SET            0x08
  94 #define N_ARG            0x10
  95 #define M_ARG            0x20
  96
  97 #define M_MASK           (M_CLR | M_SET | M_ARG)
  98 #define N_MASK           (N_CLR | N_SET | N_ARG)
  99 #define SET_MASK         (N_SET | M_SET)
 100 #define CLR_MASK         (N_CLR | M_CLR)
 101 #define SET_CLR_MASK     (SET_MASK | CLR_MASK)
 102 #define ARG_MASK         (M_ARG | N_ARG)
 103
 104 /*
 105  * Here are the bit masks for the "arg_flags" member of struct options below.
 106  */
 107
 108 /*
 109  * cast type:
 110  *   00 int
 111  *   01 char *
 112  *   02 HOST_COPY in_ether
 113  *   03 HOST_COPY INET_resolve
 114  */
 115 #define A_CAST_TYPE      0x03
 116 /*
 117  * map type:
 118  *   00 not a map type (mem_start, io_addr, irq)
 119  *   04 memstart (unsigned long)
 120  *   08 io_addr  (unsigned short)
 121  *   0C irq      (unsigned char)
 122  */
 123 #define A_MAP_TYPE       0x0C
 124 #define A_ARG_REQ        0x10   /* Set if an arg is required. */
 125 #define A_NETMASK        0x20   /* Set if netmask (check for multiple sets). */
 126 #define A_SET_AFTER      0x40   /* Set a flag at the end. */
 127 #define A_COLON_CHK      0x80   /* Is this needed?  See below. */
 128 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
 129 #define A_HOSTNAME      0x100   /* Set if it is ip addr. */
 130 #define A_BROADCAST     0x200   /* Set if it is broadcast addr. */
 131 #else
 132 #define A_HOSTNAME          0
 133 #define A_BROADCAST         0
 134 #endif
 135
 136 /*
 137  * These defines are for dealing with the A_CAST_TYPE field.
 138  */
 139 #define A_CAST_CHAR_PTR  0x01
 140 #define A_CAST_RESOLVE   0x01
 141 #define A_CAST_HOST_COPY 0x02
 142 #define A_CAST_HOST_COPY_IN_ETHER    A_CAST_HOST_COPY
 143 #define A_CAST_HOST_COPY_RESOLVE     (A_CAST_HOST_COPY | A_CAST_RESOLVE)
 144
 145 /*
 146  * These defines are for dealing with the A_MAP_TYPE field.
 147  */
 148 #define A_MAP_ULONG      0x04   /* memstart */
 149 #define A_MAP_USHORT     0x08   /* io_addr */
 150 #define A_MAP_UCHAR      0x0C   /* irq */
 151
 152 /*
 153  * Define the bit masks signifying which operations to perform for each arg.
 154  */
 155
 156 #define ARG_METRIC       (A_ARG_REQ /*| A_CAST_INT*/)
 157 #define ARG_MTU          (A_ARG_REQ /*| A_CAST_INT*/)
 158 #define ARG_TXQUEUELEN   (A_ARG_REQ /*| A_CAST_INT*/)
 159 #define ARG_MEM_START    (A_ARG_REQ | A_MAP_ULONG)
 160 #define ARG_IO_ADDR      (A_ARG_REQ | A_MAP_ULONG)
 161 #define ARG_IRQ          (A_ARG_REQ | A_MAP_UCHAR)
 162 #define ARG_DSTADDR      (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE)
 163 #define ARG_NETMASK      (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_NETMASK)
 164 #define ARG_BROADCAST    (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_BROADCAST)
 165 #define ARG_HW           (A_ARG_REQ | A_CAST_HOST_COPY_IN_ETHER)
 166 #define ARG_POINTOPOINT  (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
 167 #define ARG_KEEPALIVE    (A_ARG_REQ | A_CAST_CHAR_PTR)
 168 #define ARG_OUTFILL      (A_ARG_REQ | A_CAST_CHAR_PTR)
 169 #define ARG_HOSTNAME     (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_COLON_CHK | A_HOSTNAME)
 170 #define ARG_ADD_DEL      (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
 171
 172
 173 /*
 174  * Set up the tables.  Warning!  They must have corresponding order!
 175  */
 176
 177 struct arg1opt {
 178         const char *name;
 179         unsigned short selector;
 180         unsigned short ifr_offset;
 181 };
 182
 183 struct options {
 184         const char *name;
 185 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
 186         const unsigned int flags:6;
 187         const unsigned int arg_flags:10;
 188 #else
 189         const unsigned char flags;
 190         const unsigned char arg_flags;
 191 #endif
 192         const unsigned short selector;
 193 };
 194
 195 #define ifreq_offsetof(x)  offsetof(struct ifreq, x)
 196
 197 static const struct arg1opt Arg1Opt[] = {
 198         {"SIOCSIFMETRIC",  SIOCSIFMETRIC,  ifreq_offsetof(ifr_metric)},
 199         {"SIOCSIFMTU",     SIOCSIFMTU,     ifreq_offsetof(ifr_mtu)},
 200         {"SIOCSIFTXQLEN",  SIOCSIFTXQLEN,  ifreq_offsetof(ifr_qlen)},
 201         {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
 202         {"SIOCSIFNETMASK", SIOCSIFNETMASK, ifreq_offsetof(ifr_netmask)},
 203         {"SIOCSIFBRDADDR", SIOCSIFBRDADDR, ifreq_offsetof(ifr_broadaddr)},
 204 #ifdef CONFIG_FEATURE_IFCONFIG_HW
 205         {"SIOCSIFHWADDR",  SIOCSIFHWADDR,  ifreq_offsetof(ifr_hwaddr)},
 206 #endif
 207         {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
 208 #ifdef SIOCSKEEPALIVE
 209         {"SIOCSKEEPALIVE", SIOCSKEEPALIVE, ifreq_offsetof(ifr_data)},
 210 #endif
 211 #ifdef SIOCSOUTFILL
 212         {"SIOCSOUTFILL",   SIOCSOUTFILL,   ifreq_offsetof(ifr_data)},
 213 #endif
 214 #ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
 215         {"SIOCSIFMAP",     SIOCSIFMAP,     ifreq_offsetof(ifr_map.mem_start)},
 216         {"SIOCSIFMAP",     SIOCSIFMAP,     ifreq_offsetof(ifr_map.base_addr)},
 217         {"SIOCSIFMAP",     SIOCSIFMAP,     ifreq_offsetof(ifr_map.irq)},
 218 #endif
 219         /* Last entry if for unmatched (possibly hostname) arg. */
 220 #ifdef CONFIG_FEATURE_IPV6
 221         {"SIOCSIFADDR",    SIOCSIFADDR,    ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
 222         {"SIOCDIFADDR",    SIOCDIFADDR,    ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
 223 #endif
 224         {"SIOCSIFADDR",    SIOCSIFADDR,    ifreq_offsetof(ifr_addr)},
 225 };
 226
 227 static const struct options OptArray[] = {
 228         {"metric",      N_ARG,         ARG_METRIC,      0},
 229         {"mtu",         N_ARG,         ARG_MTU,         0},
 230         {"txqueuelen",  N_ARG,         ARG_TXQUEUELEN,  0},
 231         {"dstaddr",     N_ARG,         ARG_DSTADDR,     0},
 232         {"netmask",     N_ARG,         ARG_NETMASK,     0},
 233         {"broadcast",   N_ARG | M_CLR, ARG_BROADCAST,   IFF_BROADCAST},
 234 #ifdef CONFIG_FEATURE_IFCONFIG_HW
 235         {"hw",          N_ARG, ARG_HW,                  0},
 236 #endif
 237         {"pointopoint", N_ARG | M_CLR, ARG_POINTOPOINT, IFF_POINTOPOINT},
 238 #ifdef SIOCSKEEPALIVE
 239         {"keepalive",   N_ARG,         ARG_KEEPALIVE,   0},
 240 #endif
 241 #ifdef SIOCSOUTFILL
 242         {"outfill",     N_ARG,         ARG_OUTFILL,     0},
 243 #endif
 244 #ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
 245         {"mem_start",   N_ARG,         ARG_MEM_START,   0},
 246         {"io_addr",     N_ARG,         ARG_IO_ADDR,     0},
 247         {"irq",         N_ARG,         ARG_IRQ,         0},
 248 #endif
 249 #ifdef CONFIG_FEATURE_IPV6
 250         {"add",         N_ARG,         ARG_ADD_DEL,     0},
 251         {"del",         N_ARG,         ARG_ADD_DEL,     0},
 252 #endif
 253         {"arp",         N_CLR | M_SET, 0,               IFF_NOARP},
 254         {"trailers",    N_CLR | M_SET, 0,               IFF_NOTRAILERS},
 255         {"promisc",     N_SET | M_CLR, 0,               IFF_PROMISC},
 256         {"multicast",   N_SET | M_CLR, 0,               IFF_MULTICAST},
 257         {"allmulti",    N_SET | M_CLR, 0,               IFF_ALLMULTI},
 258         {"dynamic",     N_SET | M_CLR, 0,               IFF_DYNAMIC},
 259         {"up",          N_SET,         0,               (IFF_UP | IFF_RUNNING)},
 260         {"down",        N_CLR,         0,               IFF_UP},
 261         {NULL,          0,             ARG_HOSTNAME,    (IFF_UP | IFF_RUNNING)}
 262 };
 263
 264 /*
 265  * A couple of prototypes.
 266  */
 267
 268 #ifdef CONFIG_FEATURE_IFCONFIG_HW
 269 static int in_ether(char *bufp, struct sockaddr *sap);
 270 #endif
 271
 272 #ifdef CONFIG_FEATURE_IFCONFIG_STATUS
 273 extern int interface_opt_a;
 274 extern int display_interfaces(char *ifname);
 275 #endif
 276
 277 /*
 278  * Our main function.
 279  */
 280
 281 int ifconfig_main(int argc, char **argv)
 282 {
 283         struct ifreq ifr;
 284         struct sockaddr_in sai;
 285 #ifdef CONFIG_FEATURE_IPV6
 286         struct sockaddr_in6 sai6;
 287 #endif
 288 #ifdef CONFIG_FEATURE_IFCONFIG_HW
 289         struct sockaddr sa;
 290 #endif
 291         const struct arg1opt *a1op;
 292         const struct options *op;
 293         int sockfd;                     /* socket fd we use to manipulate stuff with */
 294         int goterr;
 295         int selector;
 296 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
 297         unsigned int mask;
 298         unsigned int did_flags;
 299         in_addr_t sai_hostname, sai_netmask;
 300 #else
 301         unsigned char mask;
 302         unsigned char did_flags;
 303 #endif
 304         char *p;
 305         char host[128];
 306
 307         goterr = 0;
 308         did_flags = 0;
 309
 310         /* skip argv[0] */
 311         ++argv;
 312         --argc;
 313
 314 #ifdef CONFIG_FEATURE_IFCONFIG_STATUS
 315         if ((argc > 0) && (((*argv)[0] == '-') && ((*argv)[1] == 'a') && !(*argv)[2])) {
 316                 interface_opt_a = 1;
 317                 --argc;
 318                 ++argv;
 319         }
 320 #endif
 321
 322         if (argc <= 1) {
 323 #ifdef CONFIG_FEATURE_IFCONFIG_STATUS
 324                 return display_interfaces(argc ? *argv : NULL);
 325 #else
 326                 bb_error_msg_and_die
 327                         ("ifconfig was not compiled with interface status display support.");
 328 #endif
 329         }
 330
 331         /* Create a channel to the NET kernel. */
 332         if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
 333                 bb_perror_msg_and_die("socket");
 334         }
 335
 336         /* get interface name */
 337         safe_strncpy(ifr.ifr_name, *argv, IFNAMSIZ);
 338
 339         /* Process the remaining arguments. */
 340         while (*++argv != (char *) NULL) {
 341                 p = *argv;
 342                 mask = N_MASK;
 343                 if (*p == '-') {        /* If the arg starts with '-'... */
 344                         ++p;            /*    advance past it and */
 345                         mask = M_MASK;  /*    set the appropriate mask. */
 346                 }
 347                 for (op = OptArray; op->name; op++) {   /* Find table entry. */
 348                         if (strcmp(p, op->name) == 0) { /* If name matches... */
 349                                 if ((mask &= op->flags)) {      /* set the mask and go. */
 350                                         goto FOUND_ARG;;
 351                                 }
 352                                 /* If we get here, there was a valid arg with an */
 353                                 /* invalid '-' prefix. */
 354                                 ++goterr;
 355                                 goto LOOP;
 356                         }
 357                 }
 358
 359                 /* We fell through, so treat as possible hostname. */
 360                 a1op = Arg1Opt + (sizeof(Arg1Opt) / sizeof(Arg1Opt[0])) - 1;
 361                 mask = op->arg_flags;
 362                 goto HOSTNAME;
 363
 364           FOUND_ARG:
 365                 if (mask & ARG_MASK) {
 366                         mask = op->arg_flags;
 367                         a1op = Arg1Opt + (op - OptArray);
 368                         if (mask & A_NETMASK & did_flags) {
 369                                 bb_show_usage();
 370                         }
 371                         if (*++argv == NULL) {
 372                                 if (mask & A_ARG_REQ) {
 373                                         bb_show_usage();
 374                                 } else {
 375                                         --argv;
 376                                         mask &= A_SET_AFTER;    /* just for broadcast */
 377                                 }
 378                         } else {        /* got an arg so process it */
 379                           HOSTNAME:
 380                                 did_flags |= (mask & (A_NETMASK|A_HOSTNAME));
 381                                 if (mask & A_CAST_HOST_COPY) {
 382 #ifdef CONFIG_FEATURE_IFCONFIG_HW
 383                                         if (mask & A_CAST_RESOLVE) {
 384 #endif
 385 #ifdef CONFIG_FEATURE_IPV6
 386                                                 char *prefix;
 387                                                 int prefix_len = 0;
 388 #endif
 389
 390                                                 safe_strncpy(host, *argv, (sizeof host));
 391 #ifdef CONFIG_FEATURE_IPV6
 392                                                 if ((prefix = strchr(host, '/'))) {
 393                                                         prefix_len = atol(prefix + 1);
 394                                                         if ((prefix_len < 0) || (prefix_len > 128)) {
 395                                                                 ++goterr;
 396                                                                 goto LOOP;
 397                                                         }
 398                                                         *prefix = 0;
 399                                                 }
 400 #endif
 401
 402                                                 sai.sin_family = AF_INET;
 403                                                 sai.sin_port = 0;
 404                                                 if (!strcmp(host, bb_INET_default)) {
 405                                                         /* Default is special, meaning 0.0.0.0. */
 406                                                         sai.sin_addr.s_addr = INADDR_ANY;
 407 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
 408                                                 } else if (((host[0] == '+') && !host[1]) && (mask & A_BROADCAST) &&
 409                                                                    (did_flags & (A_NETMASK|A_HOSTNAME)) == (A_NETMASK|A_HOSTNAME)) {
 410                                                         /* + is special, meaning broadcast is derived. */
 411                                                         sai.sin_addr.s_addr = (~sai_netmask) | (sai_hostname & sai_netmask);
 412 #endif
 413 #ifdef CONFIG_FEATURE_IPV6
 414                                                 } else if (inet_pton(AF_INET6, host, &sai6.sin6_addr) > 0) {
 415                                                         int sockfd6;
 416                                                         struct in6_ifreq ifr6;
 417
 418                                                         memcpy((char *) &ifr6.ifr6_addr,
 419                                                                    (char *) &sai6.sin6_addr,
 420                                                                    sizeof(struct in6_addr));
 421
 422                                                         /* Create a channel to the NET kernel. */
 423                                                         if ((sockfd6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 424                                                                 bb_perror_msg_and_die("socket6");
 425                                                         }
 426                                                         if (ioctl(sockfd6, SIOGIFINDEX, &ifr) < 0) {
 427                                                                 perror("SIOGIFINDEX");
 428                                                                 ++goterr;
 429                                                                 continue;
 430                                                         }
 431                                                         ifr6.ifr6_ifindex = ifr.ifr_ifindex;
 432                                                         ifr6.ifr6_prefixlen = prefix_len;
 433                                                         if (ioctl(sockfd6, a1op->selector, &ifr6) < 0) {
 434                                                                 perror(a1op->name);
 435                                                                 ++goterr;
 436                                                         }
 437                                                         continue;
 438 #endif
 439                                                 } else if (inet_aton(host, &sai.sin_addr) == 0) {
 440                                                         /* It's not a dotted quad. */
 441                                                         ++goterr;
 442                                                         continue;
 443                                                 }
 444 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
 445                                                 if (mask & A_HOSTNAME) {
 446                                                         sai_hostname = sai.sin_addr.s_addr;
 447                                                 }
 448                                                 if (mask & A_NETMASK) {
 449                                                         sai_netmask = sai.sin_addr.s_addr;
 450                                                 }
 451 #endif
 452                                                 p = (char *) &sai;
 453 #ifdef CONFIG_FEATURE_IFCONFIG_HW
 454                                         } else {        /* A_CAST_HOST_COPY_IN_ETHER */
 455                                                 /* This is the "hw" arg case. */
 456                                                 if (strcmp("ether", *argv) || (*++argv == NULL)) {
 457                                                         bb_show_usage();
 458                                                 }
 459                                                 safe_strncpy(host, *argv, (sizeof host));
 460                                                 if (in_ether(host, &sa)) {
 461                                                         bb_error_msg("invalid hw-addr %s", host);
 462                                                         ++goterr;
 463                                                         continue;
 464                                                 }
 465                                                 p = (char *) &sa;
 466                                         }
 467 #endif
 468                                         memcpy((((char *) (&ifr)) + a1op->ifr_offset),
 469                                                    p, sizeof(struct sockaddr));
 470                                 } else {
 471                                         unsigned int i = strtoul(*argv, NULL, 0);
 472
 473                                         p = ((char *) (&ifr)) + a1op->ifr_offset;
 474 #ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
 475                                         if (mask & A_MAP_TYPE) {
 476                                                 if (ioctl(sockfd, SIOCGIFMAP, &ifr) < 0) {
 477                                                         ++goterr;
 478                                                         continue;
 479                                                 }
 480                                                 if ((mask & A_MAP_UCHAR) == A_MAP_UCHAR) {
 481                                                         *((unsigned char *) p) = i;
 482                                                 } else if (mask & A_MAP_USHORT) {
 483                                                         *((unsigned short *) p) = i;
 484                                                 } else {
 485                                                         *((unsigned long *) p) = i;
 486                                                 }
 487                                         } else
 488 #endif
 489                                         if (mask & A_CAST_CHAR_PTR) {
 490                                                 *((caddr_t *) p) = (caddr_t) i;
 491                                         } else {        /* A_CAST_INT */
 492                                                 *((int *) p) = i;
 493                                         }
 494                                 }
 495
 496                                 if (ioctl(sockfd, a1op->selector, &ifr) < 0) {
 497                                         perror(a1op->name);
 498                                         ++goterr;
 499                                         continue;
 500                                 }
 501 #ifdef QUESTIONABLE_ALIAS_CASE
 502                                 if (mask & A_COLON_CHK) {
 503                                         /*
 504                                          * Don't do the set_flag() if the address is an alias with
 505                                          * a - at the end, since it's deleted already! - Roman
 506                                          *
 507                                          * Should really use regex.h here, not sure though how well
 508                                          * it'll go with the cross-platform support etc.
 509                                          */
 510                                         char *ptr;
 511                                         short int found_colon = 0;
 512
 513                                         for (ptr = ifr.ifr_name; *ptr; ptr++) {
 514                                                 if (*ptr == ':') {
 515                                                         found_colon++;
 516                                                 }
 517                                         }
 518
 519                                         if (found_colon && *(ptr - 1) == '-') {
 520                                                 continue;
 521                                         }
 522                                 }
 523 #endif
 524                         }
 525                         if (!(mask & A_SET_AFTER)) {
 526                                 continue;
 527                         }
 528                         mask = N_SET;
 529                 }
 530
 531                 if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
 532                         perror("SIOCGIFFLAGS");
 533                         ++goterr;
 534                 } else {
 535                         selector = op->selector;
 536                         if (mask & SET_MASK) {
 537                                 ifr.ifr_flags |= selector;
 538                         } else {
 539                                 ifr.ifr_flags &= ~selector;
 540                         }
 541                         if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
 542                                 perror("SIOCSIFFLAGS");
 543                                 ++goterr;
 544                         }
 545                 }
 546           LOOP:
 547                 continue;
 548         }                                       /* end of while-loop */
 549
 550         return goterr;
 551 }
 552
 553 #ifdef CONFIG_FEATURE_IFCONFIG_HW
 554 /* Input an Ethernet address and convert to binary. */
 555 static int in_ether(char *bufp, struct sockaddr *sap)
 556 {
 557         unsigned char *ptr;
 558         int i, j;
 559         unsigned char val;
 560         unsigned char c;
 561
 562         sap->sa_family = ARPHRD_ETHER;
 563         ptr = sap->sa_data;
 564
 565         i = 0;
 566         do {
 567                 j = val = 0;
 568
 569                 /* We might get a semicolon here - not required. */
 570                 if (i && (*bufp == ':')) {
 571                         bufp++;
 572                 }
 573
 574                 do {
 575                         c = *bufp;
 576                         if (((unsigned char)(c - '0')) <= 9) {
 577                                 c -= '0';
 578                         } else if (((unsigned char)((c|0x20) - 'a')) <= 5) {
 579                                 c = (c|0x20) - ('a'-10);
 580                         } else if (j && (c == ':' || c == 0)) {
 581                                 break;
 582                         } else {
 583                                 return -1;
 584                         }
 585                         ++bufp;
 586                         val <<= 4;
 587                         val += c;
 588                 } while (++j < 2);
 589                 *ptr++ = val;
 590         } while (++i < ETH_ALEN);
 591
 592         return (int) (*bufp);   /* Error if we don't end at end of string. */
 593 }
 594 #endif