LXR busybox/networking/ifconfig.c

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * ifconfig
   4 *
   5 * Similar to the standard Unix ifconfig, but with only the necessary
   6 * parts for AF_INET, and without any printing of if info (for now).
   7 *
   8 * Bjorn Wesen, Axis Communications AB
   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 source tree.
  14 */
  15/*
  16 * Heavily modified by Manuel Novoa III       Mar 6, 2001
  17 *
  18 * From initial port to busybox, removed most of the redundancy by
  19 * converting to a table-driven approach.  Added several (optional)
  20 * args missing from initial port.
  21 *
  22 * Still missing:  media, tunnel.
  23 *
  24 * 2002-04-20
  25 * IPV6 support added by Bart Visscher <magick@linux-fan.com>
  26 */
  27//config:config IFCONFIG
  28//config:       bool "ifconfig (12 kb)"
  29//config:       default y
  30//config:       help
  31//config:       Ifconfig is used to configure the kernel-resident network interfaces.
  32//config:
  33//config:config FEATURE_IFCONFIG_STATUS
  34//config:       bool "Enable status reporting output (+7k)"
  35//config:       default y
  36//config:       depends on IFCONFIG
  37//config:       help
  38//config:       If ifconfig is called with no arguments it will display the status
  39//config:       of the currently active interfaces.
  40//config:
  41//config:config FEATURE_IFCONFIG_SLIP
  42//config:       bool "Enable slip-specific options \"keepalive\" and \"outfill\""
  43//config:       default y
  44//config:       depends on IFCONFIG
  45//config:       help
  46//config:       Allow "keepalive" and "outfill" support for SLIP. If you're not
  47//config:       planning on using serial lines, leave this unchecked.
  48//config:
  49//config:config FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
  50//config:       bool "Enable options \"mem_start\", \"io_addr\", and \"irq\""
  51//config:       default y
  52//config:       depends on IFCONFIG
  53//config:       help
  54//config:       Allow the start address for shared memory, start address for I/O,
  55//config:       and/or the interrupt line used by the specified device.
  56//config:
  57//config:config FEATURE_IFCONFIG_HW
  58//config:       bool "Enable option \"hw\" (ether only)"
  59//config:       default y
  60//config:       depends on IFCONFIG
  61//config:       help
  62//config:       Set the hardware address of this interface, if the device driver
  63//config:       supports  this  operation. Currently, we only support the 'ether'
  64//config:       class.
  65//config:
  66//config:config FEATURE_IFCONFIG_BROADCAST_PLUS
  67//config:       bool "Set the broadcast automatically"
  68//config:       default y
  69//config:       depends on IFCONFIG
  70//config:       help
  71//config:       Setting this will make ifconfig attempt to find the broadcast
  72//config:       automatically if the value '+' is used.
  73
  74//applet:IF_IFCONFIG(APPLET(ifconfig, BB_DIR_SBIN, BB_SUID_DROP))
  75
  76//kbuild:lib-$(CONFIG_IFCONFIG) += ifconfig.o interface.o
  77
  78//usage:#define ifconfig_trivial_usage
  79//usage:        IF_FEATURE_IFCONFIG_STATUS("[-a]") " [IFACE] [ADDRESS]"
  80//usage:#define ifconfig_full_usage "\n\n"
  81//usage:       "Configure a network interface\n"
  82//usage:     "\n"
  83//usage:        IF_FEATURE_IPV6(
  84//usage:       "        [add ADDRESS[/PREFIXLEN]]\n")
  85//usage:        IF_FEATURE_IPV6(
  86//usage:       "        [del ADDRESS[/PREFIXLEN]]\n")
  87//usage:       "        [[-]broadcast [ADDRESS]] [[-]pointopoint [ADDRESS]]\n"
  88//usage:       "        [netmask ADDRESS] [dstaddr ADDRESS]\n"
  89//usage:        IF_FEATURE_IFCONFIG_SLIP(
  90//usage:       "        [outfill NN] [keepalive NN]\n")
  91//usage:       "        " IF_FEATURE_IFCONFIG_HW("[hw ether" IF_FEATURE_HWIB("|infiniband")" ADDRESS] ") "[metric NN] [mtu NN]\n"
  92//usage:       "        [[-]trailers] [[-]arp] [[-]allmulti]\n"
  93//usage:       "        [multicast] [[-]promisc] [txqueuelen NN] [[-]dynamic]\n"
  94//usage:        IF_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ(
  95//usage:       "        [mem_start NN] [io_addr NN] [irq NN]\n")
  96//usage:       "        [up|down] ..."
  97
  98#include "libbb.h"
  99#include "inet_common.h"
 100#include <net/if.h>
 101#include <net/if_arp.h>
 102#include <netinet/in.h>
 103#ifdef HAVE_NET_ETHERNET_H
 104# include <net/ethernet.h>
 105#endif
 106
 107#if ENABLE_FEATURE_IFCONFIG_SLIP
 108# include <linux/if_slip.h>
 109#endif
 110
 111/* I don't know if this is needed for busybox or not.  Anyone? */
 112#define QUESTIONABLE_ALIAS_CASE
 113
 114
 115/* Defines for glibc2.0 users. */
 116#ifndef SIOCSIFTXQLEN
 117# define SIOCSIFTXQLEN      0x8943
 118# define SIOCGIFTXQLEN      0x8942
 119#endif
 120
 121/* ifr_qlen is ifru_ivalue, but it isn't present in 2.0 kernel headers */
 122#ifndef ifr_qlen
 123# define ifr_qlen        ifr_ifru.ifru_mtu
 124#endif
 125
 126#ifndef IFF_DYNAMIC
 127# define IFF_DYNAMIC     0x8000 /* dialup device with changing addresses */
 128#endif
 129
 130#if ENABLE_FEATURE_IPV6
 131struct in6_ifreq {
 132        struct in6_addr ifr6_addr;
 133        uint32_t ifr6_prefixlen;
 134        int ifr6_ifindex;
 135};
 136#endif
 137
 138/*
 139 * Here are the bit masks for the "flags" member of struct options below.
 140 * N_ signifies no arg prefix; M_ signifies arg prefixed by '-'.
 141 * CLR clears the flag; SET sets the flag; ARG signifies (optional) arg.
 142 */
 143#define N_CLR            0x01
 144#define M_CLR            0x02
 145#define N_SET            0x04
 146#define M_SET            0x08
 147#define N_ARG            0x10
 148#define M_ARG            0x20
 149
 150#define M_MASK           (M_CLR | M_SET | M_ARG)
 151#define N_MASK           (N_CLR | N_SET | N_ARG)
 152#define SET_MASK         (N_SET | M_SET)
 153#define CLR_MASK         (N_CLR | M_CLR)
 154#define SET_CLR_MASK     (SET_MASK | CLR_MASK)
 155#define ARG_MASK         (M_ARG | N_ARG)
 156
 157/*
 158 * Here are the bit masks for the "arg_flags" member of struct options below.
 159 */
 160
 161/*
 162 * cast type:
 163 *   00 int
 164 *   01 char *
 165 *   02 HOST_COPY in_ether
 166 *   03 HOST_COPY INET_resolve
 167 */
 168#define A_CAST_TYPE      0x03
 169/*
 170 * map type:
 171 *   00 not a map type (mem_start, io_addr, irq)
 172 *   04 memstart (unsigned long)
 173 *   08 io_addr  (unsigned short)
 174 *   0C irq      (unsigned char)
 175 */
 176#define A_MAP_TYPE       0x0C
 177#define A_ARG_REQ        0x10   /* Set if an arg is required. */
 178#define A_NETMASK        0x20   /* Set if netmask (check for multiple sets). */
 179#define A_SET_AFTER      0x40   /* Set a flag at the end. */
 180#define A_COLON_CHK      0x80   /* Is this needed?  See below. */
 181#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
 182#define A_HOSTNAME      0x100   /* Set if it is ip addr. */
 183#define A_BROADCAST     0x200   /* Set if it is broadcast addr. */
 184#else
 185#define A_HOSTNAME          0
 186#define A_BROADCAST         0
 187#endif
 188
 189/*
 190 * These defines are for dealing with the A_CAST_TYPE field.
 191 */
 192#define A_CAST_CHAR_PTR  0x01
 193#define A_CAST_RESOLVE   0x01
 194#define A_CAST_HOST_COPY 0x02
 195#define A_CAST_HOST_COPY_IN_ETHER    A_CAST_HOST_COPY
 196#define A_CAST_HOST_COPY_RESOLVE     (A_CAST_HOST_COPY | A_CAST_RESOLVE)
 197
 198/*
 199 * These defines are for dealing with the A_MAP_TYPE field.
 200 */
 201#define A_MAP_ULONG      0x04   /* memstart */
 202#define A_MAP_USHORT     0x08   /* io_addr */
 203#define A_MAP_UCHAR      0x0C   /* irq */
 204
 205/*
 206 * Define the bit masks signifying which operations to perform for each arg.
 207 */
 208
 209#define ARG_METRIC       (A_ARG_REQ /*| A_CAST_INT*/)
 210#define ARG_MTU          (A_ARG_REQ /*| A_CAST_INT*/)
 211#define ARG_TXQUEUELEN   (A_ARG_REQ /*| A_CAST_INT*/)
 212#define ARG_MEM_START    (A_ARG_REQ | A_MAP_ULONG)
 213#define ARG_IO_ADDR      (A_ARG_REQ | A_MAP_ULONG)
 214#define ARG_IRQ          (A_ARG_REQ | A_MAP_UCHAR)
 215#define ARG_DSTADDR      (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE)
 216#define ARG_NETMASK      (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_NETMASK)
 217#define ARG_BROADCAST    (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_BROADCAST)
 218#define ARG_HW           (A_ARG_REQ | A_CAST_HOST_COPY_IN_ETHER)
 219#define ARG_POINTOPOINT  (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
 220#define ARG_KEEPALIVE    (A_ARG_REQ | A_CAST_CHAR_PTR)
 221#define ARG_OUTFILL      (A_ARG_REQ | A_CAST_CHAR_PTR)
 222#define ARG_HOSTNAME     (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_COLON_CHK | A_HOSTNAME)
 223#define ARG_ADD_DEL      (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
 224
 225
 226struct arg1opt {
 227        const char *name;
 228        unsigned short selector;
 229        unsigned short ifr_offset;
 230};
 231
 232struct options {
 233        const char *name;
 234#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
 235        const unsigned int flags:6;
 236        const unsigned int arg_flags:10;
 237#else
 238        const unsigned char flags;
 239        const unsigned char arg_flags;
 240#endif
 241        const unsigned short selector;
 242};
 243
 244#define ifreq_offsetof(x)  offsetof(struct ifreq, x)
 245
 246/*
 247 * Set up the tables.  Warning!  They must have corresponding order!
 248 */
 249
 250static const struct arg1opt Arg1Opt[] ALIGN_PTR = {
 251        { "SIFMETRIC",  SIOCSIFMETRIC,  ifreq_offsetof(ifr_metric) },
 252        { "SIFMTU",     SIOCSIFMTU,     ifreq_offsetof(ifr_mtu) },
 253        { "SIFTXQLEN",  SIOCSIFTXQLEN,  ifreq_offsetof(ifr_qlen) },
 254        { "SIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr) },
 255        { "SIFNETMASK", SIOCSIFNETMASK, ifreq_offsetof(ifr_netmask) },
 256        { "SIFBRDADDR", SIOCSIFBRDADDR, ifreq_offsetof(ifr_broadaddr) },
 257#if ENABLE_FEATURE_IFCONFIG_HW
 258        { "SIFHWADDR",  SIOCSIFHWADDR,  ifreq_offsetof(ifr_hwaddr) },
 259#endif
 260        { "SIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr) },
 261#ifdef SIOCSKEEPALIVE
 262        { "SKEEPALIVE", SIOCSKEEPALIVE, ifreq_offsetof(ifr_data) },
 263#endif
 264#ifdef SIOCSOUTFILL
 265        { "SOUTFILL",   SIOCSOUTFILL,   ifreq_offsetof(ifr_data) },
 266#endif
 267#if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
 268        { "SIFMAP",     SIOCSIFMAP,     ifreq_offsetof(ifr_map.mem_start) },
 269        { "SIFMAP",     SIOCSIFMAP,     ifreq_offsetof(ifr_map.base_addr) },
 270        { "SIFMAP",     SIOCSIFMAP,     ifreq_offsetof(ifr_map.irq) },
 271#endif
 272#if ENABLE_FEATURE_IPV6
 273        { "SIFADDR",    SIOCSIFADDR,    ifreq_offsetof(ifr_addr) }, /* IPv6 version ignores the offset */
 274        { "DIFADDR",    SIOCDIFADDR,    ifreq_offsetof(ifr_addr) }, /* IPv6 version ignores the offset */
 275#endif
 276        /* Last entry is for unmatched (assumed to be hostname/address) arg. */
 277        { "SIFADDR",    SIOCSIFADDR,    ifreq_offsetof(ifr_addr) },
 278};
 279
 280static const struct options OptArray[] ALIGN_PTR = {
 281        { "metric",      N_ARG,         ARG_METRIC,      0 },
 282        { "mtu",         N_ARG,         ARG_MTU,         0 },
 283        { "txqueuelen",  N_ARG,         ARG_TXQUEUELEN,  0 },
 284        { "dstaddr",     N_ARG,         ARG_DSTADDR,     0 },
 285        { "netmask",     N_ARG,         ARG_NETMASK,     0 },
 286        { "broadcast",   N_ARG | M_CLR, ARG_BROADCAST,   IFF_BROADCAST },
 287#if ENABLE_FEATURE_IFCONFIG_HW
 288        { "hw",          N_ARG,         ARG_HW,          0 },
 289#endif
 290        { "pointopoint", N_ARG | M_CLR, ARG_POINTOPOINT, IFF_POINTOPOINT },
 291#ifdef SIOCSKEEPALIVE
 292        { "keepalive",   N_ARG,         ARG_KEEPALIVE,   0 },
 293#endif
 294#ifdef SIOCSOUTFILL
 295        { "outfill",     N_ARG,         ARG_OUTFILL,     0 },
 296#endif
 297#if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
 298        { "mem_start",   N_ARG,         ARG_MEM_START,   0 },
 299        { "io_addr",     N_ARG,         ARG_IO_ADDR,     0 },
 300        { "irq",         N_ARG,         ARG_IRQ,         0 },
 301#endif
 302#if ENABLE_FEATURE_IPV6
 303        { "add",         N_ARG,         ARG_ADD_DEL,     0 },
 304        { "del",         N_ARG,         ARG_ADD_DEL,     0 },
 305#endif
 306        { "arp",         N_CLR | M_SET, 0,               IFF_NOARP },
 307        { "trailers",    N_CLR | M_SET, 0,               IFF_NOTRAILERS },
 308        { "promisc",     N_SET | M_CLR, 0,               IFF_PROMISC },
 309        { "multicast",   N_SET | M_CLR, 0,               IFF_MULTICAST },
 310        { "allmulti",    N_SET | M_CLR, 0,               IFF_ALLMULTI },
 311        { "dynamic",     N_SET | M_CLR, 0,               IFF_DYNAMIC },
 312        { "up",          N_SET,         0,               (IFF_UP | IFF_RUNNING) },
 313        { "down",        N_CLR,         0,               IFF_UP },
 314        { NULL,          0,             ARG_HOSTNAME,    (IFF_UP | IFF_RUNNING) }
 315};
 316
 317int ifconfig_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 318int ifconfig_main(int argc UNUSED_PARAM, char **argv)
 319{
 320        struct ifreq ifr;
 321        struct sockaddr_in sai;
 322#if ENABLE_FEATURE_IFCONFIG_HW
 323        struct sockaddr sa;
 324#endif
 325        const struct arg1opt *a1op;
 326        const struct options *op;
 327        int sockfd;                     /* socket fd we use to manipulate stuff with */
 328        int selector;
 329#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
 330        unsigned int mask;
 331        unsigned int did_flags;
 332        unsigned int sai_hostname, sai_netmask;
 333#else
 334        unsigned char mask;
 335        unsigned char did_flags;
 336#endif
 337        char *p;
 338        /*char host[128];*/
 339        const char *host = NULL; /* make gcc happy */
 340        IF_FEATURE_IFCONFIG_STATUS(char *show_all_param;)
 341
 342        did_flags = 0;
 343#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
 344        sai_hostname = 0;
 345        sai_netmask = 0;
 346#endif
 347
 348        /* skip argv[0] */
 349        ++argv;
 350
 351#if ENABLE_FEATURE_IFCONFIG_STATUS
 352        show_all_param = NULL;
 353        if (argv[0] && argv[0][0] == '-' && argv[0][1] == 'a' && !argv[0][2]) {
 354                ++argv;
 355                show_all_param = IFNAME_SHOW_DOWNED_TOO;
 356        }
 357#endif
 358
 359        if (!argv[0] || !argv[1]) { /* one or no args */
 360#if ENABLE_FEATURE_IFCONFIG_STATUS
 361                return display_interfaces(argv[0] ? argv[0] : show_all_param);
 362#else
 363                bb_simple_error_msg_and_die("no support for status display");
 364#endif
 365        }
 366
 367        /* Create a channel to the NET kernel. */
 368        sockfd = xsocket(AF_INET, SOCK_DGRAM, 0);
 369
 370        /* get interface name */
 371        strncpy_IFNAMSIZ(ifr.ifr_name, *argv);
 372
 373        /* Process the remaining arguments. */
 374        while (*++argv != NULL) {
 375                p = *argv;
 376                mask = N_MASK;
 377                if (*p == '-') {        /* If the arg starts with '-'... */
 378                        ++p;            /*    advance past it and */
 379                        mask = M_MASK;  /*    set the appropriate mask. */
 380                }
 381                for (op = OptArray; op->name; op++) {   /* Find table entry. */
 382                        if (strcmp(p, op->name) == 0) { /* If name matches... */
 383                                mask &= op->flags;
 384                                if (mask)       /* set the mask and go. */
 385                                        goto FOUND_ARG;
 386                                /* If we get here, there was a valid arg with an */
 387                                /* invalid '-' prefix. */
 388                                bb_error_msg_and_die("bad: '%s'", p-1);
 389                        }
 390                }
 391
 392                /* We fell through, so treat as possible hostname. */
 393                a1op = Arg1Opt + ARRAY_SIZE(Arg1Opt) - 1;
 394                mask = op->arg_flags;
 395                goto HOSTNAME;
 396
 397 FOUND_ARG:
 398                if (mask & ARG_MASK) {
 399                        mask = op->arg_flags;
 400                        if (mask & A_NETMASK & did_flags)
 401                                bb_show_usage();
 402                        a1op = Arg1Opt + (op - OptArray);
 403                        if (*++argv == NULL) {
 404                                if (mask & A_ARG_REQ)
 405                                        bb_show_usage();
 406                                --argv;
 407                                mask &= A_SET_AFTER;    /* just for broadcast */
 408                        } else {        /* got an arg so process it */
 409 HOSTNAME:
 410                                did_flags |= (mask & (A_NETMASK|A_HOSTNAME));
 411                                if (mask & A_CAST_HOST_COPY) {
 412#if ENABLE_FEATURE_IFCONFIG_HW
 413                                        if (mask & A_CAST_RESOLVE) {
 414#endif
 415                                                host = *argv;
 416                                                if (strcmp(host, "inet") == 0)
 417                                                        continue; /* compat stuff */
 418                                                sai.sin_family = AF_INET;
 419                                                sai.sin_port = 0;
 420                                                if (strcmp(host, "default") == 0) {
 421                                                        /* Default is special, meaning 0.0.0.0. */
 422                                                        sai.sin_addr.s_addr = INADDR_ANY;
 423                                                }
 424#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
 425                                                else if ((host[0] == '+' && !host[1])
 426                                                 && (mask & A_BROADCAST)
 427                                                 && (did_flags & (A_NETMASK|A_HOSTNAME)) == (A_NETMASK|A_HOSTNAME)
 428                                                ) {
 429                                                        /* + is special, meaning broadcast is derived. */
 430                                                        sai.sin_addr.s_addr = (~sai_netmask) | (sai_hostname & sai_netmask);
 431                                                }
 432#endif
 433                                                else {
 434                                                        len_and_sockaddr *lsa;
 435#if ENABLE_FEATURE_IPV6
 436                                                        char *prefix;
 437                                                        int prefix_len = 0;
 438                                                        prefix = strchr(host, '/');
 439                                                        if (prefix) {
 440                                                                prefix_len = xatou_range(prefix + 1, 0, 128);
 441                                                                *prefix = '\0';
 442                                                        }
 443 resolve:
 444#endif
 445                                                        lsa = xhost2sockaddr(host, 0);
 446#if ENABLE_FEATURE_IPV6
 447                                                        if (lsa->u.sa.sa_family != AF_INET6 && prefix) {
 448/* TODO: we do not support "ifconfig eth0 up 1.2.3.4/17".
 449 * For now, just make it fail instead of silently ignoring "/17" part:
 450 */
 451                                                                *prefix = '/';
 452                                                                goto resolve;
 453                                                        }
 454                                                        if (lsa->u.sa.sa_family == AF_INET6) {
 455                                                                int sockfd6;
 456                                                                struct in6_ifreq ifr6;
 457
 458                                                                sockfd6 = xsocket(AF_INET6, SOCK_DGRAM, 0);
 459                                                                xioctl(sockfd6, SIOCGIFINDEX, &ifr);
 460                                                                ifr6.ifr6_ifindex = ifr.ifr_ifindex;
 461                                                                ifr6.ifr6_prefixlen = prefix_len;
 462                                                                memcpy(&ifr6.ifr6_addr,
 463                                                                                &lsa->u.sin6.sin6_addr,
 464                                                                                sizeof(struct in6_addr));
 465                                                                ioctl_or_perror_and_die(sockfd6, a1op->selector, &ifr6, "SIOC%s", a1op->name);
 466                                                                if (ENABLE_FEATURE_CLEAN_UP)
 467                                                                        free(lsa);
 468                                                                continue;
 469                                                        }
 470#endif
 471                                                        sai.sin_addr = lsa->u.sin.sin_addr;
 472                                                        if (ENABLE_FEATURE_CLEAN_UP)
 473                                                                free(lsa);
 474                                                }
 475#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
 476                                                if (mask & A_HOSTNAME)
 477                                                        sai_hostname = sai.sin_addr.s_addr;
 478                                                if (mask & A_NETMASK)
 479                                                        sai_netmask = sai.sin_addr.s_addr;
 480#endif
 481                                                p = (char *) &sai;
 482#if ENABLE_FEATURE_IFCONFIG_HW
 483                                        } else {        /* A_CAST_HOST_COPY_IN_ETHER */
 484                                                /* This is the "hw" arg case. */
 485                                                smalluint hw_class = index_in_substrings("ether\0"
 486                                                                IF_FEATURE_HWIB("infiniband\0"), *argv) + 1;
 487                                                if (!hw_class || !*++argv)
 488                                                        bb_show_usage();
 489                                                host = *argv;
 490                                                if (hw_class == 1 ? in_ether(host, &sa) : in_ib(host, &sa))
 491                                                        bb_error_msg_and_die("invalid hw-addr %s", host);
 492                                                p = (char *) &sa;
 493                                        }
 494#endif
 495                                        memcpy( ((char *)&ifr) + a1op->ifr_offset,
 496                                                p, sizeof(struct sockaddr));
 497                                } else {
 498                                        /* FIXME: error check?? */
 499                                        unsigned long i = strtoul(*argv, NULL, 0);
 500                                        p = ((char *)&ifr) + a1op->ifr_offset;
 501#if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
 502                                        if (mask & A_MAP_TYPE) {
 503                                                xioctl(sockfd, SIOCGIFMAP, &ifr);
 504                                                if ((mask & A_MAP_UCHAR) == A_MAP_UCHAR)
 505                                                        *(unsigned char *) p = i;
 506                                                else if (mask & A_MAP_USHORT)
 507                                                        *(unsigned short *) p = i;
 508                                                else
 509                                                        *(unsigned long *) p = i;
 510                                        } else
 511#endif
 512                                        if (mask & A_CAST_CHAR_PTR)
 513                                                *(caddr_t *) p = (caddr_t) i;
 514                                        else    /* A_CAST_INT */
 515                                                *(int *) p = i;
 516                                }
 517
 518                                ioctl_or_perror_and_die(sockfd, a1op->selector, &ifr, "SIOC%s", a1op->name);
 519#ifdef QUESTIONABLE_ALIAS_CASE
 520                                if (mask & A_COLON_CHK) {
 521                                        /*
 522                                         * Don't do the set_flag() if the address is an alias with
 523                                         * a '-' at the end, since it's deleted already! - Roman
 524                                         *
 525                                         * Should really use regex.h here, not sure though how well
 526                                         * it'll go with the cross-platform support etc.
 527                                         */
 528                                        char *ptr;
 529                                        short int found_colon = 0;
 530                                        for (ptr = ifr.ifr_name; *ptr; ptr++)
 531                                                if (*ptr == ':')
 532                                                        found_colon++;
 533                                        if (found_colon && ptr[-1] == '-')
 534                                                continue;
 535                                }
 536#endif
 537                        }
 538                        if (!(mask & A_SET_AFTER))
 539                                continue;
 540                        mask = N_SET;
 541                } /* if (mask & ARG_MASK) */
 542
 543                xioctl(sockfd, SIOCGIFFLAGS, &ifr);
 544                selector = op->selector;
 545                if (mask & SET_MASK)
 546                        ifr.ifr_flags |= selector;
 547                else
 548                        ifr.ifr_flags &= ~selector;
 549                xioctl(sockfd, SIOCSIFFLAGS, &ifr);
 550        } /* while () */
 551
 552        if (ENABLE_FEATURE_CLEAN_UP)
 553                close(sockfd);
 554        return 0;
 555}
 556