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 <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>             /* strcmp and friends */
  32 #include <ctype.h>              /* isdigit and friends */
  33 #include <stddef.h>             /* offsetof */
  34 #include <unistd.h>
  35 #include <netdb.h>
  36 #include <sys/ioctl.h>
  37 #include <net/if.h>
  38 #include <net/if_arp.h>
  39 #include <netinet/in.h>
  40 #if __GLIBC__ >=2 && __GLIBC_MINOR >= 1
  41 #include <netpacket/packet.h>
  42 #include <net/ethernet.h>
  43 #else
  44 #include <sys/types.h>
  45 #include <netinet/if_ether.h>
  46 #endif
  47 #include "inet_common.h"
  48 #include "busybox.h"
  49
  50 #ifdef CONFIG_FEATURE_IFCONFIG_SLIP
  51 # include <net/if_slip.h>
  52 #endif
  53
  54 /* I don't know if this is needed for busybox or not.  Anyone? */
  55 #define QUESTIONABLE_ALIAS_CASE
  56
  57
  58 /* Defines for glibc2.0 users. */
  59 #ifndef SIOCSIFTXQLEN
  60 # define SIOCSIFTXQLEN      0x8943
  61 # define SIOCGIFTXQLEN      0x8942
  62 #endif
  63
  64 /* ifr_qlen is ifru_ivalue, but it isn't present in 2.0 kernel headers */
  65 #ifndef ifr_qlen
  66 # define ifr_qlen        ifr_ifru.ifru_mtu
  67 #endif
  68
  69 #ifndef IFF_DYNAMIC
  70 # define IFF_DYNAMIC     0x8000 /* dialup device with changing addresses */
  71 #endif
  72
  73 #ifdef CONFIG_FEATURE_IPV6
  74 struct in6_ifreq {
  75         struct in6_addr ifr6_addr;
  76         uint32_t ifr6_prefixlen;
  77         int ifr6_ifindex;
  78 };
  79 #endif
  80
  81 /*
  82  * Here are the bit masks for the "flags" member of struct options below.
  83  * N_ signifies no arg prefix; M_ signifies arg prefixed by '-'.
  84  * CLR clears the flag; SET sets the flag; ARG signifies (optional) arg.
  85  */
  86 #define N_CLR            0x01
  87 #define M_CLR            0x02
  88 #define N_SET            0x04
  89 #define M_SET            0x08
  90 #define N_ARG            0x10
  91 #define M_ARG            0x20
  92
  93 #define M_MASK           (M_CLR | M_SET | M_ARG)
  94 #define N_MASK           (N_CLR | N_SET | N_ARG)
  95 #define SET_MASK         (N_SET | M_SET)
  96 #define CLR_MASK         (N_CLR | M_CLR)
  97 #define SET_CLR_MASK     (SET_MASK | CLR_MASK)
  98 #define ARG_MASK         (M_ARG | N_ARG)
  99
 100 /*
 101  * Here are the bit masks for the "arg_flags" member of struct options below.
 102  */
 103
 104 /*
 105  * cast type:
 106  *   00 int
 107  *   01 char *
 108  *   02 HOST_COPY in_ether
 109  *   03 HOST_COPY INET_resolve
 110  */
 111 #define A_CAST_TYPE      0x03
 112 /*
 113  * map type:
 114  *   00 not a map type (mem_start, io_addr, irq)
 115  *   04 memstart (unsigned long)
 116  *   08 io_addr  (unsigned short)
 117  *   0C irq      (unsigned char)
 118  */
 119 #define A_MAP_TYPE       0x0C
 120 #define A_ARG_REQ        0x10   /* Set if an arg is required. */
 121 #define A_NETMASK        0x20   /* Set if netmask (check for multiple sets). */
 122 #define A_SET_AFTER      0x40   /* Set a flag at the end. */
 123 #define A_COLON_CHK      0x80   /* Is this needed?  See below. */
 124 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
 125 #define A_HOSTNAME      0x100   /* Set if it is ip addr. */
 126 #define A_BROADCAST     0x200   /* Set if it is broadcast addr. */
 127 #else
 128 #define A_HOSTNAME          0
 129 #define A_BROADCAST         0
 130 #endif
 131
 132 /*
 133  * These defines are for dealing with the A_CAST_TYPE field.
 134  */
 135 #define A_CAST_CHAR_PTR  0x01
 136 #define A_CAST_RESOLVE   0x01
 137 #define A_CAST_HOST_COPY 0x02
 138 #define A_CAST_HOST_COPY_IN_ETHER    A_CAST_HOST_COPY
 139 #define A_CAST_HOST_COPY_RESOLVE     (A_CAST_HOST_COPY | A_CAST_RESOLVE)
 140
 141 /*
 142  * These defines are for dealing with the A_MAP_TYPE field.
 143  */
 144 #define A_MAP_ULONG      0x04   /* memstart */
 145 #define A_MAP_USHORT     0x08   /* io_addr */
 146 #define A_MAP_UCHAR      0x0C   /* irq */
 147
 148 /*
 149  * Define the bit masks signifying which operations to perform for each arg.
 150  */
 151
 152 #define ARG_METRIC       (A_ARG_REQ /*| A_CAST_INT*/)
 153 #define ARG_MTU          (A_ARG_REQ /*| A_CAST_INT*/)
 154 #define ARG_TXQUEUELEN   (A_ARG_REQ /*| A_CAST_INT*/)
 155 #define ARG_MEM_START    (A_ARG_REQ | A_MAP_ULONG)
 156 #define ARG_IO_ADDR      (A_ARG_REQ | A_MAP_ULONG)
 157 #define ARG_IRQ          (A_ARG_REQ | A_MAP_UCHAR)
 158 #define ARG_DSTADDR      (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE)
 159 #define ARG_NETMASK      (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_NETMASK)
 160 #define ARG_BROADCAST    (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_BROADCAST)
 161 #define ARG_HW           (A_ARG_REQ | A_CAST_HOST_COPY_IN_ETHER)
 162 #define ARG_POINTOPOINT  (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
 163 #define ARG_KEEPALIVE    (A_ARG_REQ | A_CAST_CHAR_PTR)
 164 #define ARG_OUTFILL      (A_ARG_REQ | A_CAST_CHAR_PTR)
 165 #define ARG_HOSTNAME     (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_COLON_CHK | A_HOSTNAME)
 166 #define ARG_ADD_DEL      (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
 167
 168
 169 /*
 170  * Set up the tables.  Warning!  They must have corresponding order!
 171  */
 172
 173 struct arg1opt {
 174         const char *name;
 175         int selector;
 176         unsigned short ifr_offset;
 177 };
 178
 179 struct options {
 180         const char *name;
 181 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
 182         const unsigned int flags:6;
 183         const unsigned int arg_flags:10;
 184 #else
 185         const unsigned char flags;
 186         const unsigned char arg_flags;
 187 #endif
 188         const unsigned short selector;
 189 };
 190
 191 #define ifreq_offsetof(x)  offsetof(struct ifreq, x)
 192
 193 static const struct arg1opt Arg1Opt[] = {
 194         {"SIOCSIFMETRIC",  SIOCSIFMETRIC,  ifreq_offsetof(ifr_metric)},
 195         {"SIOCSIFMTU",     SIOCSIFMTU,     ifreq_offsetof(ifr_mtu)},
 196         {"SIOCSIFTXQLEN",  SIOCSIFTXQLEN,  ifreq_offsetof(ifr_qlen)},
 197         {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
 198         {"SIOCSIFNETMASK", SIOCSIFNETMASK, ifreq_offsetof(ifr_netmask)},
 199         {"SIOCSIFBRDADDR", SIOCSIFBRDADDR, ifreq_offsetof(ifr_broadaddr)},
 200 #ifdef CONFIG_FEATURE_IFCONFIG_HW
 201         {"SIOCSIFHWADDR",  SIOCSIFHWADDR,  ifreq_offsetof(ifr_hwaddr)},
 202 #endif
 203         {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
 204 #ifdef SIOCSKEEPALIVE
 205         {"SIOCSKEEPALIVE", SIOCSKEEPALIVE, ifreq_offsetof(ifr_data)},
 206 #endif
 207 #ifdef SIOCSOUTFILL
 208         {"SIOCSOUTFILL",   SIOCSOUTFILL,   ifreq_offsetof(ifr_data)},
 209 #endif
 210 #ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
 211         {"SIOCSIFMAP",     SIOCSIFMAP,     ifreq_offsetof(ifr_map.mem_start)},
 212         {"SIOCSIFMAP",     SIOCSIFMAP,     ifreq_offsetof(ifr_map.base_addr)},
 213         {"SIOCSIFMAP",     SIOCSIFMAP,     ifreq_offsetof(ifr_map.irq)},
 214 #endif
 215         /* Last entry if for unmatched (possibly hostname) arg. */
 216 #ifdef CONFIG_FEATURE_IPV6
 217         {"SIOCSIFADDR",    SIOCSIFADDR,    ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
 218         {"SIOCDIFADDR",    SIOCDIFADDR,    ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
 219 #endif
 220         {"SIOCSIFADDR",    SIOCSIFADDR,    ifreq_offsetof(ifr_addr)},
 221 };
 222
 223 static const struct options OptArray[] = {
 224         {"metric",      N_ARG,         ARG_METRIC,      0},
 225         {"mtu",         N_ARG,         ARG_MTU,         0},
 226         {"txqueuelen",  N_ARG,         ARG_TXQUEUELEN,  0},
 227         {"dstaddr",     N_ARG,         ARG_DSTADDR,     0},
 228         {"netmask",     N_ARG,         ARG_NETMASK,     0},
 229         {"broadcast",   N_ARG | M_CLR, ARG_BROADCAST,   IFF_BROADCAST},
 230 #ifdef CONFIG_FEATURE_IFCONFIG_HW
 231         {"hw",          N_ARG, ARG_HW,                  0},
 232 #endif
 233         {"pointopoint", N_ARG | M_CLR, ARG_POINTOPOINT, IFF_POINTOPOINT},
 234 #ifdef SIOCSKEEPALIVE
 235         {"keepalive",   N_ARG,         ARG_KEEPALIVE,   0},
 236 #endif
 237 #ifdef SIOCSOUTFILL
 238         {"outfill",     N_ARG,         ARG_OUTFILL,     0},
 239 #endif
 240 #ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
 241         {"mem_start",   N_ARG,         ARG_MEM_START,   0},
 242         {"io_addr",     N_ARG,         ARG_IO_ADDR,     0},
 243         {"irq",         N_ARG,         ARG_IRQ,         0},
 244 #endif
 245 #ifdef CONFIG_FEATURE_IPV6
 246         {"add",         N_ARG,         ARG_ADD_DEL,     0},
 247         {"del",         N_ARG,         ARG_ADD_DEL,     0},
 248 #endif
 249         {"arp",         N_CLR | M_SET, 0,               IFF_NOARP},
 250         {"trailers",    N_CLR | M_SET, 0,               IFF_NOTRAILERS},
 251         {"promisc",     N_SET | M_CLR, 0,               IFF_PROMISC},
 252         {"multicast",   N_SET | M_CLR, 0,               IFF_MULTICAST},
 253         {"allmulti",    N_SET | M_CLR, 0,               IFF_ALLMULTI},
 254         {"dynamic",     N_SET | M_CLR, 0,               IFF_DYNAMIC},
 255         {"up",          N_SET,         0,               (IFF_UP | IFF_RUNNING)},
 256         {"down",        N_CLR,         0,               IFF_UP},
 257         {NULL,          0,             ARG_HOSTNAME,    (IFF_UP | IFF_RUNNING)}
 258 };
 259
 260 /*
 261  * A couple of prototypes.
 262  */
 263
 264 #ifdef CONFIG_FEATURE_IFCONFIG_HW
 265 static int in_ether(char *bufp, struct sockaddr *sap);
 266 #endif
 267
 268 #ifdef CONFIG_FEATURE_IFCONFIG_STATUS
 269 extern int interface_opt_a;
 270 extern int display_interfaces(char *ifname);
 271 #endif
 272
 273 /*
 274  * Our main function.
 275  */
 276
 277 int ifconfig_main(int argc, char **argv)
 278 {
 279         struct ifreq ifr;
 280         struct sockaddr_in sai;
 281 #ifdef CONFIG_FEATURE_IPV6
 282         struct sockaddr_in6 sai6;
 283 #endif
 284 #ifdef CONFIG_FEATURE_IFCONFIG_HW
 285         struct sockaddr sa;
 286 #endif
 287         const struct arg1opt *a1op;
 288         const struct options *op;
 289         int sockfd;                     /* socket fd we use to manipulate stuff with */
 290         int goterr;
 291         int selector;
 292 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
 293         unsigned int mask;
 294         unsigned int did_flags;
 295         unsigned int sai_hostname, sai_netmask;
 296 #else
 297         unsigned char mask;
 298         unsigned char did_flags;
 299 #endif
 300         char *p;
 301         char host[128];
 302
 303         goterr = 0;
 304         did_flags = 0;
 305 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
 306         sai_hostname = 0;
 307         sai_netmask = 0;
 308 #endif
 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         sockfd = bb_xsocket(AF_INET, SOCK_DGRAM, 0);
 333
 334         /* get interface name */
 335         safe_strncpy(ifr.ifr_name, *argv, IFNAMSIZ);
 336
 337         /* Process the remaining arguments. */
 338         while (*++argv != (char *) NULL) {
 339                 p = *argv;
 340                 mask = N_MASK;
 341                 if (*p == '-') {        /* If the arg starts with '-'... */
 342                         ++p;            /*    advance past it and */
 343                         mask = M_MASK;  /*    set the appropriate mask. */
 344                 }
 345                 for (op = OptArray; op->name; op++) {   /* Find table entry. */
 346                         if (strcmp(p, op->name) == 0) { /* If name matches... */
 347                                 if ((mask &= op->flags)) {      /* set the mask and go. */
 348                                         goto FOUND_ARG;
 349                                 }
 350                                 /* If we get here, there was a valid arg with an */
 351                                 /* invalid '-' prefix. */
 352                                 ++goterr;
 353                                 goto LOOP;
 354                         }
 355                 }
 356
 357                 /* We fell through, so treat as possible hostname. */
 358                 a1op = Arg1Opt + (sizeof(Arg1Opt) / sizeof(Arg1Opt[0])) - 1;
 359                 mask = op->arg_flags;
 360                 goto HOSTNAME;
 361
 362           FOUND_ARG:
 363                 if (mask & ARG_MASK) {
 364                         mask = op->arg_flags;
 365                         a1op = Arg1Opt + (op - OptArray);
 366                         if (mask & A_NETMASK & did_flags) {
 367                                 bb_show_usage();
 368                         }
 369                         if (*++argv == NULL) {
 370                                 if (mask & A_ARG_REQ) {
 371                                         bb_show_usage();
 372                                 } else {
 373                                         --argv;
 374                                         mask &= A_SET_AFTER;    /* just for broadcast */
 375                                 }
 376                         } else {        /* got an arg so process it */
 377                           HOSTNAME:
 378                                 did_flags |= (mask & (A_NETMASK|A_HOSTNAME));
 379                                 if (mask & A_CAST_HOST_COPY) {
 380 #ifdef CONFIG_FEATURE_IFCONFIG_HW
 381                                         if (mask & A_CAST_RESOLVE) {
 382 #endif
 383 #ifdef CONFIG_FEATURE_IPV6
 384                                                 char *prefix;
 385                                                 int prefix_len = 0;
 386 #endif
 387
 388                                                 safe_strncpy(host, *argv, (sizeof host));
 389 #ifdef CONFIG_FEATURE_IPV6
 390                                                 if ((prefix = strchr(host, '/'))) {
 391                                                         if (safe_strtoi(prefix + 1, &prefix_len) ||
 392                                                                 (prefix_len < 0) || (prefix_len > 128))
 393                                                         {
 394                                                                 ++goterr;
 395                                                                 goto LOOP;
 396                                                         }
 397                                                         *prefix = 0;
 398                                                 }
 399 #endif
 400
 401                                                 sai.sin_family = AF_INET;
 402                                                 sai.sin_port = 0;
 403                                                 if (!strcmp(host, bb_INET_default)) {
 404                                                         /* Default is special, meaning 0.0.0.0. */
 405                                                         sai.sin_addr.s_addr = INADDR_ANY;
 406 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
 407                                                 } else if (((host[0] == '+') && !host[1]) && (mask & A_BROADCAST) &&
 408                                                                    (did_flags & (A_NETMASK|A_HOSTNAME)) == (A_NETMASK|A_HOSTNAME)) {
 409                                                         /* + is special, meaning broadcast is derived. */
 410                                                         sai.sin_addr.s_addr = (~sai_netmask) | (sai_hostname & sai_netmask);
 411 #endif
 412 #ifdef CONFIG_FEATURE_IPV6
 413                                                 } else if (inet_pton(AF_INET6, host, &sai6.sin6_addr) > 0) {
 414                                                         int sockfd6;
 415                                                         struct in6_ifreq ifr6;
 416
 417                                                         memcpy((char *) &ifr6.ifr6_addr,
 418                                                                    (char *) &sai6.sin6_addr,
 419                                                                    sizeof(struct in6_addr));
 420
 421                                                         /* Create a channel to the NET kernel. */
 422                                                         if ((sockfd6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 423                                                                 bb_perror_msg_and_die("socket6");
 424                                                         }
 425                                                         if (ioctl(sockfd6, SIOGIFINDEX, &ifr) < 0) {
 426                                                                 perror("SIOGIFINDEX");
 427                                                                 ++goterr;
 428                                                                 continue;
 429                                                         }
 430                                                         ifr6.ifr6_ifindex = ifr.ifr_ifindex;
 431                                                         ifr6.ifr6_prefixlen = prefix_len;
 432                                                         if (ioctl(sockfd6, a1op->selector, &ifr6) < 0) {
 433                                                                 perror(a1op->name);
 434                                                                 ++goterr;
 435                                                         }
 436                                                         continue;
 437 #endif
 438                                                 } else if (inet_aton(host, &sai.sin_addr) == 0) {
 439                                                         /* It's not a dotted quad. */
 440                                                         struct hostent *hp;
 441                                                         if ((hp = gethostbyname(host)) == (struct hostent *)NULL) {
 442                                                                 ++goterr;
 443                                                                 continue;
 444                                                         }
 445                                                         memcpy((char *) &sai.sin_addr, (char *) hp->h_addr_list[0],
 446                                                         sizeof(struct in_addr));
 447                                                 }
 448 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
 449                                                 if (mask & A_HOSTNAME) {
 450                                                         sai_hostname = sai.sin_addr.s_addr;
 451                                                 }
 452                                                 if (mask & A_NETMASK) {
 453                                                         sai_netmask = sai.sin_addr.s_addr;
 454                                                 }
 455 #endif
 456                                                 p = (char *) &sai;
 457 #ifdef CONFIG_FEATURE_IFCONFIG_HW
 458                                         } else {        /* A_CAST_HOST_COPY_IN_ETHER */
 459                                                 /* This is the "hw" arg case. */
 460                                                 if (strcmp("ether", *argv) || (*++argv == NULL)) {
 461                                                         bb_show_usage();
 462                                                 }
 463                                                 safe_strncpy(host, *argv, (sizeof host));
 464                                                 if (in_ether(host, &sa)) {
 465                                                         bb_error_msg("invalid hw-addr %s", host);
 466                                                         ++goterr;
 467                                                         continue;
 468                                                 }
 469                                                 p = (char *) &sa;
 470                                         }
 471 #endif
 472                                         memcpy((((char *) (&ifr)) + a1op->ifr_offset),
 473                                                    p, sizeof(struct sockaddr));
 474                                 } else {
 475                                         unsigned long i = strtoul(*argv, NULL, 0);
 476
 477                                         p = ((char *) (&ifr)) + a1op->ifr_offset;
 478 #ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
 479                                         if (mask & A_MAP_TYPE) {
 480                                                 if (ioctl(sockfd, SIOCGIFMAP, &ifr) < 0) {
 481                                                         ++goterr;
 482                                                         continue;
 483                                                 }
 484                                                 if ((mask & A_MAP_UCHAR) == A_MAP_UCHAR) {
 485                                                         *((unsigned char *) p) = i;
 486                                                 } else if (mask & A_MAP_USHORT) {
 487                                                         *((unsigned short *) p) = i;
 488                                                 } else {
 489                                                         *((unsigned long *) p) = i;
 490                                                 }
 491                                         } else
 492 #endif
 493                                         if (mask & A_CAST_CHAR_PTR) {
 494                                                 *((caddr_t *) p) = (caddr_t) i;
 495                                         } else {        /* A_CAST_INT */
 496                                                 *((int *) p) = i;
 497                                         }
 498                                 }
 499
 500                                 if (ioctl(sockfd, a1op->selector, &ifr) < 0) {
 501                                         perror(a1op->name);
 502                                         ++goterr;
 503                                         continue;
 504                                 }
 505 #ifdef QUESTIONABLE_ALIAS_CASE
 506                                 if (mask & A_COLON_CHK) {
 507                                         /*
 508                                          * Don't do the set_flag() if the address is an alias with
 509                                          * a - at the end, since it's deleted already! - Roman
 510                                          *
 511                                          * Should really use regex.h here, not sure though how well
 512                                          * it'll go with the cross-platform support etc.
 513                                          */
 514                                         char *ptr;
 515                                         short int found_colon = 0;
 516
 517                                         for (ptr = ifr.ifr_name; *ptr; ptr++) {
 518                                                 if (*ptr == ':') {
 519                                                         found_colon++;
 520                                                 }
 521                                         }
 522
 523                                         if (found_colon && *(ptr - 1) == '-') {
 524                                                 continue;
 525                                         }
 526                                 }
 527 #endif
 528                         }
 529                         if (!(mask & A_SET_AFTER)) {
 530                                 continue;
 531                         }
 532                         mask = N_SET;
 533                 }
 534
 535                 if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
 536                         perror("SIOCGIFFLAGS");
 537                         ++goterr;
 538                 } else {
 539                         selector = op->selector;
 540                         if (mask & SET_MASK) {
 541                                 ifr.ifr_flags |= selector;
 542                         } else {
 543                                 ifr.ifr_flags &= ~selector;
 544                         }
 545                         if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
 546                                 perror("SIOCSIFFLAGS");
 547                                 ++goterr;
 548                         }
 549                 }
 550           LOOP:
 551                 continue;
 552         }                                       /* end of while-loop */
 553
 554         if (ENABLE_FEATURE_CLEAN_UP) close(sockfd);
 555         return goterr;
 556 }
 557
 558 #ifdef CONFIG_FEATURE_IFCONFIG_HW
 559 /* Input an Ethernet address and convert to binary. */
 560 static int in_ether(char *bufp, struct sockaddr *sap)
 561 {
 562         char *ptr;
 563         int i, j;
 564         unsigned char val;
 565         unsigned char c;
 566
 567         sap->sa_family = ARPHRD_ETHER;
 568         ptr = sap->sa_data;
 569
 570         i = 0;
 571         do {
 572                 j = val = 0;
 573
 574                 /* We might get a semicolon here - not required. */
 575                 if (i && (*bufp == ':')) {
 576                         bufp++;
 577                 }
 578
 579                 do {
 580                         c = *bufp;
 581                         if (((unsigned char)(c - '0')) <= 9) {
 582                                 c -= '0';
 583                         } else if (((unsigned char)((c|0x20) - 'a')) <= 5) {
 584                                 c = (c|0x20) - ('a'-10);
 585                         } else if (j && (c == ':' || c == 0)) {
 586                                 break;
 587                         } else {
 588                                 return -1;
 589                         }
 590                         ++bufp;
 591                         val <<= 4;
 592                         val += c;
 593                 } while (++j < 2);
 594                 *ptr++ = val;
 595         } while (++i < ETH_ALEN);
 596
 597         return (int) (*bufp);   /* Error if we don't end at end of string. */
 598 }
 599 #endif