networking/ifconfig.c

   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 "busybox.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
  66 struct 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
 165 struct arg1opt {
 166         const char *name;
 167         int selector;
 168         unsigned short ifr_offset;
 169 };
 170
 171 struct 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
 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)},
 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
 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},
 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
 257 static int in_ether(const char *bufp, struct sockaddr *sap);
 258 #endif
 259
 260 /*
 261  * Our main function.
 262  */
 263
 264 int ifconfig_main(int argc, char **argv)
 265 {
 266         struct ifreq ifr;
 267         struct sockaddr_in sai;
 268 #if ENABLE_FEATURE_IPV6
 269         struct sockaddr_in6 sai6;
 270 #endif
 271 #if ENABLE_FEATURE_IFCONFIG_HW
 272         struct sockaddr sa;
 273 #endif
 274         const struct arg1opt *a1op;
 275         const struct options *op;
 276         int sockfd;                     /* socket fd we use to manipulate stuff with */
 277         int selector;
 278 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
 279         unsigned int mask;
 280         unsigned int did_flags;
 281         unsigned int sai_hostname, sai_netmask;
 282 #else
 283         unsigned char mask;
 284         unsigned char did_flags;
 285 #endif
 286         char *p;
 287         /*char host[128];*/
 288         const char *host = NULL; /* make gcc happy */
 289
 290         did_flags = 0;
 291 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
 292         sai_hostname = 0;
 293         sai_netmask = 0;
 294 #endif
 295
 296         /* skip argv[0] */
 297         ++argv;
 298         --argc;
 299
 300 #if ENABLE_FEATURE_IFCONFIG_STATUS
 301         if (argc > 0 && (argv[0][0] == '-' && argv[0][1] == 'a' && !argv[0][2])) {
 302                 interface_opt_a = 1;
 303                 --argc;
 304                 ++argv;
 305         }
 306 #endif
 307
 308         if (argc <= 1) {
 309 #if ENABLE_FEATURE_IFCONFIG_STATUS
 310                 return display_interfaces(argc ? *argv : NULL);
 311 #else
 312                 bb_error_msg_and_die("no support for status display");
 313 #endif
 314         }
 315
 316         /* Create a channel to the NET kernel. */
 317         sockfd = xsocket(AF_INET, SOCK_DGRAM, 0);
 318
 319         /* get interface name */
 320         safe_strncpy(ifr.ifr_name, *argv, IFNAMSIZ);
 321
 322         /* Process the remaining arguments. */
 323         while (*++argv != (char *) NULL) {
 324                 p = *argv;
 325                 mask = N_MASK;
 326                 if (*p == '-') {        /* If the arg starts with '-'... */
 327                         ++p;            /*    advance past it and */
 328                         mask = M_MASK;  /*    set the appropriate mask. */
 329                 }
 330                 for (op = OptArray; op->name; op++) {   /* Find table entry. */
 331                         if (strcmp(p, op->name) == 0) { /* If name matches... */
 332                                 mask &= op->flags;
 333                                 if (mask)       /* set the mask and go. */
 334                                         goto FOUND_ARG;
 335                                 /* If we get here, there was a valid arg with an */
 336                                 /* invalid '-' prefix. */
 337                                 bb_error_msg_and_die("bad: '%s'", p-1);
 338                         }
 339                 }
 340
 341                 /* We fell through, so treat as possible hostname. */
 342                 a1op = Arg1Opt + (sizeof(Arg1Opt) / sizeof(Arg1Opt[0])) - 1;
 343                 mask = op->arg_flags;
 344                 goto HOSTNAME;
 345
 346  FOUND_ARG:
 347                 if (mask & ARG_MASK) {
 348                         mask = op->arg_flags;
 349                         a1op = Arg1Opt + (op - OptArray);
 350                         if (mask & A_NETMASK & did_flags)
 351                                 bb_show_usage();
 352                         if (*++argv == NULL) {
 353                                 if (mask & A_ARG_REQ)
 354                                         bb_show_usage();
 355                                 --argv;
 356                                 mask &= A_SET_AFTER;    /* just for broadcast */
 357                         } else {        /* got an arg so process it */
 358  HOSTNAME:
 359                                 did_flags |= (mask & (A_NETMASK|A_HOSTNAME));
 360                                 if (mask & A_CAST_HOST_COPY) {
 361 #if ENABLE_FEATURE_IFCONFIG_HW
 362                                         if (mask & A_CAST_RESOLVE) {
 363 #endif
 364 #if ENABLE_FEATURE_IPV6
 365                                                 char *prefix;
 366                                                 int prefix_len = 0;
 367 #endif
 368                                                 /*safe_strncpy(host, *argv, (sizeof host));*/
 369                                                 host = *argv;
 370 #if ENABLE_FEATURE_IPV6
 371                                                 prefix = strchr(host, '/');
 372                                                 if (prefix) {
 373                                                         prefix_len = xatou_range(prefix + 1, 0, 128);
 374                                                         *prefix = '\0';
 375                                                 }
 376 #endif
 377                                                 sai.sin_family = AF_INET;
 378                                                 sai.sin_port = 0;
 379                                                 if (!strcmp(host, bb_str_default)) {
 380                                                         /* Default is special, meaning 0.0.0.0. */
 381                                                         sai.sin_addr.s_addr = INADDR_ANY;
 382                                                 }
 383 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
 384                                                 else if ((host[0] == '+' && !host[1]) && (mask & A_BROADCAST)
 385                                                  && (did_flags & (A_NETMASK|A_HOSTNAME)) == (A_NETMASK|A_HOSTNAME)
 386                                                 ) {
 387                                                         /* + is special, meaning broadcast is derived. */
 388                                                         sai.sin_addr.s_addr = (~sai_netmask) | (sai_hostname & sai_netmask);
 389                                                 }
 390 #endif
 391 #if ENABLE_FEATURE_IPV6
 392                                                 else if (inet_pton(AF_INET6, host, &sai6.sin6_addr) > 0) {
 393                                                         int sockfd6;
 394                                                         struct in6_ifreq ifr6;
 395
 396                                                         memcpy((char *) &ifr6.ifr6_addr,
 397                                                                         (char *) &sai6.sin6_addr,
 398                                                                         sizeof(struct in6_addr));
 399
 400                                                         /* Create a channel to the NET kernel. */
 401                                                         sockfd6 = xsocket(AF_INET6, SOCK_DGRAM, 0);
 402                                                         if (ioctl(sockfd6, SIOGIFINDEX, &ifr) < 0)
 403                                                                 bb_perror_msg_and_die("SIOGIFINDEX");
 404                                                         ifr6.ifr6_ifindex = ifr.ifr_ifindex;
 405                                                         ifr6.ifr6_prefixlen = prefix_len;
 406                                                         if (ioctl(sockfd6, a1op->selector, &ifr6) < 0)
 407                                                                 bb_perror_msg_and_die(a1op->name);
 408                                                         continue;
 409                                                 }
 410 #endif
 411                                                 else if (inet_aton(host, &sai.sin_addr) == 0) {
 412                                                         /* It's not a dotted quad. */
 413                                                         struct hostent *hp = xgethostbyname(host);
 414                                                         memcpy((char *) &sai.sin_addr, (char *) hp->h_addr_list[0],
 415                                                                         sizeof(struct in_addr));
 416                                                 }
 417 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
 418                                                 if (mask & A_HOSTNAME)
 419                                                         sai_hostname = sai.sin_addr.s_addr;
 420                                                 if (mask & A_NETMASK)
 421                                                         sai_netmask = sai.sin_addr.s_addr;
 422 #endif
 423                                                 p = (char *) &sai;
 424 #if ENABLE_FEATURE_IFCONFIG_HW
 425                                         } else {        /* A_CAST_HOST_COPY_IN_ETHER */
 426                                                 /* This is the "hw" arg case. */
 427                                                 if (strcmp("ether", *argv) || !*++argv)
 428                                                         bb_show_usage();
 429                                                 /*safe_strncpy(host, *argv, sizeof(host));*/
 430                                                 host = *argv;
 431                                                 if (in_ether(host, &sa))
 432                                                         bb_error_msg_and_die("invalid hw-addr %s", host);
 433                                                 p = (char *) &sa;
 434                                         }
 435 #endif
 436                                         memcpy( (((char *)&ifr) + a1op->ifr_offset),
 437                                                    p, sizeof(struct sockaddr));
 438                                 } else {
 439                                         /* FIXME: error check?? */
 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                                                 if (ioctl(sockfd, SIOCGIFMAP, &ifr) < 0)
 445                                                         bb_perror_msg_and_die("SIOCGIFMAP");
 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;
 450                                                 else
 451                                                         *((unsigned long *) p) = i;
 452                                         } else
 453 #endif
 454                                         if (mask & A_CAST_CHAR_PTR)
 455                                                 *((caddr_t *) p) = (caddr_t) i;
 456                                         else    /* A_CAST_INT */
 457                                                 *((int *) p) = i;
 458                                 }
 459
 460                                 if (ioctl(sockfd, a1op->selector, &ifr) < 0)
 461                                         bb_perror_msg_and_die(a1op->name);
 462 #ifdef QUESTIONABLE_ALIAS_CASE
 463                                 if (mask & A_COLON_CHK) {
 464                                         /*
 465                                          * Don't do the set_flag() if the address is an alias with
 466                                          * a '-' at the end, since it's deleted already! - Roman
 467                                          *
 468                                          * Should really use regex.h here, not sure though how well
 469                                          * it'll go with the cross-platform support etc.
 470                                          */
 471                                         char *ptr;
 472                                         short int found_colon = 0;
 473                                         for (ptr = ifr.ifr_name; *ptr; ptr++)
 474                                                 if (*ptr == ':')
 475                                                         found_colon++;
 476                                         if (found_colon && ptr[-1] == '-')
 477                                                 continue;
 478                                 }
 479 #endif
 480                         }
 481                         if (!(mask & A_SET_AFTER))
 482                                 continue;
 483                         mask = N_SET;
 484                 }
 485
 486                 if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0)
 487                         bb_perror_msg_and_die("SIOCGIFFLAGS");
 488                 selector = op->selector;
 489                 if (mask & SET_MASK)
 490                         ifr.ifr_flags |= selector;
 491                 else
 492                         ifr.ifr_flags &= ~selector;
 493                 if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0)
 494                         bb_perror_msg_and_die("SIOCSIFFLAGS");
 495         } /* while () */
 496
 497         if (ENABLE_FEATURE_CLEAN_UP)
 498                 close(sockfd);
 499         return 0;
 500 }
 501
 502 #if ENABLE_FEATURE_IFCONFIG_HW
 503 /* Input an Ethernet address and convert to binary. */
 504 static int in_ether(const char *bufp, struct sockaddr *sap)
 505 {
 506         char *ptr;
 507         int i, j;
 508         unsigned char val;
 509         unsigned char c;
 510
 511         sap->sa_family = ARPHRD_ETHER;
 512         ptr = sap->sa_data;
 513
 514         i = 0;
 515         do {
 516                 j = val = 0;
 517
 518                 /* We might get a semicolon here - not required. */
 519                 if (i && (*bufp == ':')) {
 520                         bufp++;
 521                 }
 522
 523                 do {
 524                         c = *bufp;
 525                         if (((unsigned char)(c - '0')) <= 9) {
 526                                 c -= '0';
 527                         } else if (((unsigned char)((c|0x20) - 'a')) <= 5) {
 528                                 c = (c|0x20) - ('a'-10);
 529                         } else if (j && (c == ':' || c == 0)) {
 530                                 break;
 531                         } else {
 532                                 return -1;
 533                         }
 534                         ++bufp;
 535                         val <<= 4;
 536                         val += c;
 537                 } while (++j < 2);
 538                 *ptr++ = val;
 539         } while (++i < ETH_ALEN);
 540
 541         return *bufp; /* Error if we don't end at end of string. */
 542 }
 543 #endif