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:       select PLATFORM_LINUX
  31//config:       help
  32//config:       Ifconfig is used to configure the kernel-resident network interfaces.
  33//config:
  34//config:config FEATURE_IFCONFIG_STATUS
  35//config:       bool "Enable status reporting output (+7k)"
  36//config:       default y
  37//config:       depends on IFCONFIG
  38//config:       help
  39//config:       If ifconfig is called with no arguments it will display the status
  40//config:       of the currently active interfaces.
  41//config:
  42//config:config FEATURE_IFCONFIG_SLIP
  43//config:       bool "Enable slip-specific options \"keepalive\" and \"outfill\""
  44//config:       default y
  45//config:       depends on IFCONFIG
  46//config:       help
  47//config:       Allow "keepalive" and "outfill" support for SLIP. If you're not
  48//config:       planning on using serial lines, leave this unchecked.
  49//config:
  50//config:config FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
  51//config:       bool "Enable options \"mem_start\", \"io_addr\", and \"irq\""
  52//config:       default y
  53//config:       depends on IFCONFIG
  54//config:       help
  55//config:       Allow the start address for shared memory, start address for I/O,
  56//config:       and/or the interrupt line used by the specified device.
  57//config:
  58//config:config FEATURE_IFCONFIG_HW
  59//config:       bool "Enable option \"hw\" (ether only)"
  60//config:       default y
  61//config:       depends on IFCONFIG
  62//config:       help
  63//config:       Set the hardware address of this interface, if the device driver
  64//config:       supports  this  operation. Currently, we only support the 'ether'
  65//config:       class.
  66//config:
  67//config:config FEATURE_IFCONFIG_BROADCAST_PLUS
  68//config:       bool "Set the broadcast automatically"
  69//config:       default y
  70//config:       depends on IFCONFIG
  71//config:       help
  72//config:       Setting this will make ifconfig attempt to find the broadcast
  73//config:       automatically if the value '+' is used.
  74
  75//applet:IF_IFCONFIG(APPLET(ifconfig, BB_DIR_SBIN, BB_SUID_DROP))
  76
  77//kbuild:lib-$(CONFIG_IFCONFIG) += ifconfig.o interface.o
  78
  79//usage:#define ifconfig_trivial_usage
  80//usage:        IF_FEATURE_IFCONFIG_STATUS("[-a]") " interface [address]"
  81//usage:#define ifconfig_full_usage "\n\n"
  82//usage:       "Configure a network interface\n"
  83//usage:     "\n"
  84//usage:        IF_FEATURE_IPV6(
  85//usage:       "        [add ADDRESS[/PREFIXLEN]]\n")
  86//usage:        IF_FEATURE_IPV6(
  87//usage:       "        [del ADDRESS[/PREFIXLEN]]\n")
  88//usage:       "        [[-]broadcast [ADDRESS]] [[-]pointopoint [ADDRESS]]\n"
  89//usage:       "        [netmask ADDRESS] [dstaddr ADDRESS]\n"
  90//usage:        IF_FEATURE_IFCONFIG_SLIP(
  91//usage:       "        [outfill NN] [keepalive NN]\n")
  92//usage:       "        " IF_FEATURE_IFCONFIG_HW("[hw ether" IF_FEATURE_HWIB("|infiniband")" ADDRESS] ") "[metric NN] [mtu NN]\n"
  93//usage:       "        [[-]trailers] [[-]arp] [[-]allmulti]\n"
  94//usage:       "        [multicast] [[-]promisc] [txqueuelen NN] [[-]dynamic]\n"
  95//usage:        IF_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ(
  96//usage:       "        [mem_start NN] [io_addr NN] [irq NN]\n")
  97//usage:       "        [up|down] ..."
  98
  99#include "libbb.h"
 100#include "inet_common.h"
 101#include <net/if.h>
 102#include <net/if_arp.h>
 103#include <netinet/in.h>
 104#ifdef HAVE_NET_ETHERNET_H
 105# include <net/ethernet.h>
 106#endif
 107
 108#if ENABLE_FEATURE_IFCONFIG_SLIP
 109# include <linux/if_slip.h>
 110#endif
 111
 112/* I don't know if this is needed for busybox or not.  Anyone? */
 113#define QUESTIONABLE_ALIAS_CASE
 114
 115
 116/* Defines for glibc2.0 users. */
 117#ifndef SIOCSIFTXQLEN
 118# define SIOCSIFTXQLEN      0x8943
 119# define SIOCGIFTXQLEN      0x8942
 120#endif
 121
 122/* ifr_qlen is ifru_ivalue, but it isn't present in 2.0 kernel headers */
 123#ifndef ifr_qlen
 124# define ifr_qlen        ifr_ifru.ifru_mtu
 125#endif
 126
 127#ifndef IFF_DYNAMIC
 128# define IFF_DYNAMIC     0x8000 /* dialup device with changing addresses */
 129#endif
 130
 131#if ENABLE_FEATURE_IPV6
 132struct in6_ifreq {
 133        struct in6_addr ifr6_addr;
 134        uint32_t ifr6_prefixlen;
 135        int ifr6_ifindex;
 136};
 137#endif
 138
 139/*
 140 * Here are the bit masks for the "flags" member of struct options below.
 141 * N_ signifies no arg prefix; M_ signifies arg prefixed by '-'.
 142 * CLR clears the flag; SET sets the flag; ARG signifies (optional) arg.
 143 */
 144#define N_CLR            0x01
 145#define M_CLR            0x02
 146#define N_SET            0x04
 147#define M_SET            0x08
 148#define N_ARG            0x10
 149#define M_ARG            0x20
 150
 151#define M_MASK           (M_CLR | M_SET | M_ARG)
 152#define N_MASK           (N_CLR | N_SET | N_ARG)
 153#define SET_MASK         (N_SET | M_SET)
 154#define CLR_MASK         (N_CLR | M_CLR)
 155#define SET_CLR_MASK     (SET_MASK | CLR_MASK)
 156#define ARG_MASK         (M_ARG | N_ARG)
 157
 158/*
 159 * Here are the bit masks for the "arg_flags" member of struct options below.
 160 */
 161
 162/*
 163 * cast type:
 164 *   00 int
 165 *   01 char *
 166 *   02 HOST_COPY in_ether
 167 *   03 HOST_COPY INET_resolve
 168 */
 169#define A_CAST_TYPE      0x03
 170/*
 171 * map type:
 172 *   00 not a map type (mem_start, io_addr, irq)
 173 *   04 memstart (unsigned long)
 174 *   08 io_addr  (unsigned short)
 175 *   0C irq      (unsigned char)
 176 */
 177#define A_MAP_TYPE       0x0C
 178#define A_ARG_REQ        0x10   /* Set if an arg is required. */
 179#define A_NETMASK        0x20   /* Set if netmask (check for multiple sets). */
 180#define A_SET_AFTER      0x40   /* Set a flag at the end. */
 181#define A_COLON_CHK      0x80   /* Is this needed?  See below. */
 182#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
 183#define A_HOSTNAME      0x100   /* Set if it is ip addr. */
 184#define A_BROADCAST     0x200   /* Set if it is broadcast addr. */
 185#else
 186#define A_HOSTNAME          0
 187#define A_BROADCAST         0
 188#endif
 189
 190/*
 191 * These defines are for dealing with the A_CAST_TYPE field.
 192 */
 193#define A_CAST_CHAR_PTR  0x01
 194#define A_CAST_RESOLVE   0x01
 195#define A_CAST_HOST_COPY 0x02
 196#define A_CAST_HOST_COPY_IN_ETHER    A_CAST_HOST_COPY
 197#define A_CAST_HOST_COPY_RESOLVE     (A_CAST_HOST_COPY | A_CAST_RESOLVE)
 198
 199/*
 200 * These defines are for dealing with the A_MAP_TYPE field.
 201 */
 202#define A_MAP_ULONG      0x04   /* memstart */
 203#define A_MAP_USHORT     0x08   /* io_addr */
 204#define A_MAP_UCHAR      0x0C   /* irq */
 205
 206/*
 207 * Define the bit masks signifying which operations to perform for each arg.
 208 */
 209
 210#define ARG_METRIC       (A_ARG_REQ /*| A_CAST_INT*/)
 211#define ARG_MTU          (A_ARG_REQ /*| A_CAST_INT*/)
 212#define ARG_TXQUEUELEN   (A_ARG_REQ /*| A_CAST_INT*/)
 213#define ARG_MEM_START    (A_ARG_REQ | A_MAP_ULONG)
 214#define ARG_IO_ADDR      (A_ARG_REQ | A_MAP_ULONG)
 215#define ARG_IRQ          (A_ARG_REQ | A_MAP_UCHAR)
 216#define ARG_DSTADDR      (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE)
 217#define ARG_NETMASK      (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_NETMASK)
 218#define ARG_BROADCAST    (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_BROADCAST)
 219#define ARG_HW           (A_ARG_REQ | A_CAST_HOST_COPY_IN_ETHER)
 220#define ARG_POINTOPOINT  (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
 221#define ARG_KEEPALIVE    (A_ARG_REQ | A_CAST_CHAR_PTR)
 222#define ARG_OUTFILL      (A_ARG_REQ | A_CAST_CHAR_PTR)
 223#define ARG_HOSTNAME     (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_COLON_CHK | A_HOSTNAME)
 224#define ARG_ADD_DEL      (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
 225
 226
 227struct arg1opt {
 228        const char *name;
 229        unsigned short selector;
 230        unsigned short ifr_offset;
 231};
 232
 233struct options {
 234        const char *name;
 235#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
 236        const unsigned int flags:6;
 237        const unsigned int arg_flags:10;
 238#else
 239        const unsigned char flags;
 240        const unsigned char arg_flags;
 241#endif
 242        const unsigned short selector;
 243};
 244
 245#define ifreq_offsetof(x)  offsetof(struct ifreq, x)
 246
 247/*
 248 * Set up the tables.  Warning!  They must have corresponding order!
 249 */
 250
 251static const struct arg1opt Arg1Opt[] = {
 252        { "SIFMETRIC",  SIOCSIFMETRIC,  ifreq_offsetof(ifr_metric) },
 253        { "SIFMTU",     SIOCSIFMTU,     ifreq_offsetof(ifr_mtu) },
 254        { "SIFTXQLEN",  SIOCSIFTXQLEN,  ifreq_offsetof(ifr_qlen) },
 255        { "SIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr) },
 256        { "SIFNETMASK", SIOCSIFNETMASK, ifreq_offsetof(ifr_netmask) },
 257        { "SIFBRDADDR", SIOCSIFBRDADDR, ifreq_offsetof(ifr_broadaddr) },
 258#if ENABLE_FEATURE_IFCONFIG_HW
 259        { "SIFHWADDR",  SIOCSIFHWADDR,  ifreq_offsetof(ifr_hwaddr) },
 260#endif
 261        { "SIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr) },
 262#ifdef SIOCSKEEPALIVE
 263        { "SKEEPALIVE", SIOCSKEEPALIVE, ifreq_offsetof(ifr_data) },
 264#endif
 265#ifdef SIOCSOUTFILL
 266        { "SOUTFILL",   SIOCSOUTFILL,   ifreq_offsetof(ifr_data) },
 267#endif
 268#if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
 269        { "SIFMAP",     SIOCSIFMAP,     ifreq_offsetof(ifr_map.mem_start) },
 270        { "SIFMAP",     SIOCSIFMAP,     ifreq_offsetof(ifr_map.base_addr) },
 271        { "SIFMAP",     SIOCSIFMAP,     ifreq_offsetof(ifr_map.irq) },
 272#endif
 273#if ENABLE_FEATURE_IPV6
 274        { "SIFADDR",    SIOCSIFADDR,    ifreq_offsetof(ifr_addr) }, /* IPv6 version ignores the offset */
 275        { "DIFADDR",    SIOCDIFADDR,    ifreq_offsetof(ifr_addr) }, /* IPv6 version ignores the offset */
 276#endif
 277        /* Last entry is for unmatched (assumed to be hostname/address) arg. */
 278        { "SIFADDR",    SIOCSIFADDR,    ifreq_offsetof(ifr_addr) },
 279};
 280
 281static const struct options OptArray[] = {
 282        { "metric",      N_ARG,         ARG_METRIC,      0 },
 283        { "mtu",         N_ARG,         ARG_MTU,         0 },
 284        { "txqueuelen",  N_ARG,         ARG_TXQUEUELEN,  0 },
 285        { "dstaddr",     N_ARG,         ARG_DSTADDR,     0 },
 286        { "netmask",     N_ARG,         ARG_NETMASK,     0 },
 287        { "broadcast",   N_ARG | M_CLR, ARG_BROADCAST,   IFF_BROADCAST },
 288#if ENABLE_FEATURE_IFCONFIG_HW
 289        { "hw",          N_ARG,         ARG_HW,          0 },
 290#endif
 291        { "pointopoint", N_ARG | M_CLR, ARG_POINTOPOINT, IFF_POINTOPOINT },
 292#ifdef SIOCSKEEPALIVE
 293        { "keepalive",   N_ARG,         ARG_KEEPALIVE,   0 },
 294#endif
 295#ifdef SIOCSOUTFILL
 296        { "outfill",     N_ARG,         ARG_OUTFILL,     0 },
 297#endif
 298#if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
 299        { "mem_start",   N_ARG,         ARG_MEM_START,   0 },
 300        { "io_addr",     N_ARG,         ARG_IO_ADDR,     0 },
 301        { "irq",         N_ARG,         ARG_IRQ,         0 },
 302#endif
 303#if ENABLE_FEATURE_IPV6
 304        { "add",         N_ARG,         ARG_ADD_DEL,     0 },
 305        { "del",         N_ARG,         ARG_ADD_DEL,     0 },
 306#endif
 307        { "arp",         N_CLR | M_SET, 0,               IFF_NOARP },
 308        { "trailers",    N_CLR | M_SET, 0,               IFF_NOTRAILERS },
 309        { "promisc",     N_SET | M_CLR, 0,               IFF_PROMISC },
 310        { "multicast",   N_SET | M_CLR, 0,               IFF_MULTICAST },
 311        { "allmulti",    N_SET | M_CLR, 0,               IFF_ALLMULTI },
 312        { "dynamic",     N_SET | M_CLR, 0,               IFF_DYNAMIC },
 313        { "up",          N_SET,         0,               (IFF_UP | IFF_RUNNING) },
 314        { "down",        N_CLR,         0,               IFF_UP },
 315        { NULL,          0,             ARG_HOSTNAME,    (IFF_UP | IFF_RUNNING) }
 316};
 317
 318int ifconfig_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 319int ifconfig_main(int argc UNUSED_PARAM, char **argv)
 320{
 321        struct ifreq ifr;
 322        struct sockaddr_in sai;
 323#if ENABLE_FEATURE_IFCONFIG_HW
 324        struct sockaddr sa;
 325#endif
 326        const struct arg1opt *a1op;
 327        const struct options *op;
 328        int sockfd;                     /* socket fd we use to manipulate stuff with */
 329        int selector;
 330#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
 331        unsigned int mask;
 332        unsigned int did_flags;
 333        unsigned int sai_hostname, sai_netmask;
 334#else
 335        unsigned char mask;
 336        unsigned char did_flags;
 337#endif
 338        char *p;
 339        /*char host[128];*/
 340        const char *host = NULL; /* make gcc happy */
 341        IF_FEATURE_IFCONFIG_STATUS(char *show_all_param;)
 342
 343        did_flags = 0;
 344#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
 345        sai_hostname = 0;
 346        sai_netmask = 0;
 347#endif
 348
 349        /* skip argv[0] */
 350        ++argv;
 351
 352#if ENABLE_FEATURE_IFCONFIG_STATUS
 353        show_all_param = NULL;
 354        if (argv[0] && argv[0][0] == '-' && argv[0][1] == 'a' && !argv[0][2]) {
 355                ++argv;
 356                show_all_param = IFNAME_SHOW_DOWNED_TOO;
 357        }
 358#endif
 359
 360        if (!argv[0] || !argv[1]) { /* one or no args */
 361#if ENABLE_FEATURE_IFCONFIG_STATUS
 362                return display_interfaces(argv[0] ? argv[0] : show_all_param);
 363#else
 364                bb_error_msg_and_die("no support for status display");
 365#endif
 366        }
 367
 368        /* Create a channel to the NET kernel. */
 369        sockfd = xsocket(AF_INET, SOCK_DGRAM, 0);
 370
 371        /* get interface name */
 372        strncpy_IFNAMSIZ(ifr.ifr_name, *argv);
 373
 374        /* Process the remaining arguments. */
 375        while (*++argv != NULL) {
 376                p = *argv;
 377                mask = N_MASK;
 378                if (*p == '-') {        /* If the arg starts with '-'... */
 379                        ++p;            /*    advance past it and */
 380                        mask = M_MASK;  /*    set the appropriate mask. */
 381                }
 382                for (op = OptArray; op->name; op++) {   /* Find table entry. */
 383                        if (strcmp(p, op->name) == 0) { /* If name matches... */
 384                                mask &= op->flags;
 385                                if (mask)       /* set the mask and go. */
 386                                        goto FOUND_ARG;
 387                                /* If we get here, there was a valid arg with an */
 388                                /* invalid '-' prefix. */
 389                                bb_error_msg_and_die("bad: '%s'", p-1);
 390                        }
 391                }
 392
 393                /* We fell through, so treat as possible hostname. */
 394                a1op = Arg1Opt + ARRAY_SIZE(Arg1Opt) - 1;
 395                mask = op->arg_flags;
 396                goto HOSTNAME;
 397
 398 FOUND_ARG:
 399                if (mask & ARG_MASK) {
 400                        mask = op->arg_flags;
 401                        if (mask & A_NETMASK & did_flags)
 402                                bb_show_usage();
 403                        a1op = Arg1Opt + (op - OptArray);
 404                        if (*++argv == NULL) {
 405                                if (mask & A_ARG_REQ)
 406                                        bb_show_usage();
 407                                --argv;
 408                                mask &= A_SET_AFTER;    /* just for broadcast */
 409                        } else {        /* got an arg so process it */
 410 HOSTNAME:
 411                                did_flags |= (mask & (A_NETMASK|A_HOSTNAME));
 412                                if (mask & A_CAST_HOST_COPY) {
 413#if ENABLE_FEATURE_IFCONFIG_HW
 414                                        if (mask & A_CAST_RESOLVE) {
 415#endif
 416                                                host = *argv;
 417                                                if (strcmp(host, "inet") == 0)
 418                                                        continue; /* compat stuff */
 419                                                sai.sin_family = AF_INET;
 420                                                sai.sin_port = 0;
 421                                                if (strcmp(host, "default") == 0) {
 422                                                        /* Default is special, meaning 0.0.0.0. */
 423                                                        sai.sin_addr.s_addr = INADDR_ANY;
 424                                                }
 425#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
 426                                                else if ((host[0] == '+' && !host[1])
 427                                                 && (mask & A_BROADCAST)
 428                                                 && (did_flags & (A_NETMASK|A_HOSTNAME)) == (A_NETMASK|A_HOSTNAME)
 429                                                ) {
 430                                                        /* + is special, meaning broadcast is derived. */
 431                                                        sai.sin_addr.s_addr = (~sai_netmask) | (sai_hostname & sai_netmask);
 432                                                }
 433#endif
 434                                                else {
 435                                                        len_and_sockaddr *lsa;
 436#if ENABLE_FEATURE_IPV6
 437                                                        char *prefix;
 438                                                        int prefix_len = 0;
 439                                                        prefix = strchr(host, '/');
 440                                                        if (prefix) {
 441                                                                prefix_len = xatou_range(prefix + 1, 0, 128);
 442                                                                *prefix = '\0';
 443                                                        }
 444 resolve:
 445#endif
 446                                                        lsa = xhost2sockaddr(host, 0);
 447#if ENABLE_FEATURE_IPV6
 448                                                        if (lsa->u.sa.sa_family != AF_INET6 && prefix) {
 449/* TODO: we do not support "ifconfig eth0 up 1.2.3.4/17".
 450 * For now, just make it fail instead of silently ignoring "/17" part:
 451 */
 452                                                                *prefix = '/';
 453                                                                goto resolve;
 454                                                        }
 455                                                        if (lsa->u.sa.sa_family == AF_INET6) {
 456                                                                int sockfd6;
 457                                                                struct in6_ifreq ifr6;
 458
 459                                                                sockfd6 = xsocket(AF_INET6, SOCK_DGRAM, 0);
 460                                                                xioctl(sockfd6, SIOCGIFINDEX, &ifr);
 461                                                                ifr6.ifr6_ifindex = ifr.ifr_ifindex;
 462                                                                ifr6.ifr6_prefixlen = prefix_len;
 463                                                                memcpy(&ifr6.ifr6_addr,
 464                                                                                &lsa->u.sin6.sin6_addr,
 465                                                                                sizeof(struct in6_addr));
 466                                                                ioctl_or_perror_and_die(sockfd6, a1op->selector, &ifr6, "SIOC%s", a1op->name);
 467                                                                if (ENABLE_FEATURE_CLEAN_UP)
 468                                                                        free(lsa);
 469                                                                continue;
 470                                                        }
 471#endif
 472                                                        sai.sin_addr = lsa->u.sin.sin_addr;
 473                                                        if (ENABLE_FEATURE_CLEAN_UP)
 474                                                                free(lsa);
 475                                                }
 476#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
 477                                                if (mask & A_HOSTNAME)
 478                                                        sai_hostname = sai.sin_addr.s_addr;
 479                                                if (mask & A_NETMASK)
 480                                                        sai_netmask = sai.sin_addr.s_addr;
 481#endif
 482                                                p = (char *) &sai;
 483#if ENABLE_FEATURE_IFCONFIG_HW
 484                                        } else {        /* A_CAST_HOST_COPY_IN_ETHER */
 485                                                /* This is the "hw" arg case. */
 486                                                smalluint hw_class = index_in_substrings("ether\0"
 487                                                                IF_FEATURE_HWIB("infiniband\0"), *argv) + 1;
 488                                                if (!hw_class || !*++argv)
 489                                                        bb_show_usage();
 490                                                host = *argv;
 491                                                if (hw_class == 1 ? in_ether(host, &sa) : in_ib(host, &sa))
 492                                                        bb_error_msg_and_die("invalid hw-addr %s", host);
 493                                                p = (char *) &sa;
 494                                        }
 495#endif
 496                                        memcpy( ((char *)&ifr) + a1op->ifr_offset,
 497                                                p, sizeof(struct sockaddr));
 498                                } else {
 499                                        /* FIXME: error check?? */
 500                                        unsigned long i = strtoul(*argv, NULL, 0);
 501                                        p = ((char *)&ifr) + a1op->ifr_offset;
 502#if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
 503                                        if (mask & A_MAP_TYPE) {
 504                                                xioctl(sockfd, SIOCGIFMAP, &ifr);
 505                                                if ((mask & A_MAP_UCHAR) == A_MAP_UCHAR)
 506                                                        *(unsigned char *) p = i;
 507                                                else if (mask & A_MAP_USHORT)
 508                                                        *(unsigned short *) p = i;
 509                                                else
 510                                                        *(unsigned long *) p = i;
 511                                        } else
 512#endif
 513                                        if (mask & A_CAST_CHAR_PTR)
 514                                                *(caddr_t *) p = (caddr_t) i;
 515                                        else    /* A_CAST_INT */
 516                                                *(int *) p = i;
 517                                }
 518
 519                                ioctl_or_perror_and_die(sockfd, a1op->selector, &ifr, "SIOC%s", a1op->name);
 520#ifdef QUESTIONABLE_ALIAS_CASE
 521                                if (mask & A_COLON_CHK) {
 522                                        /*
 523                                         * Don't do the set_flag() if the address is an alias with
 524                                         * a '-' at the end, since it's deleted already! - Roman
 525                                         *
 526                                         * Should really use regex.h here, not sure though how well
 527                                         * it'll go with the cross-platform support etc.
 528                                         */
 529                                        char *ptr;
 530                                        short int found_colon = 0;
 531                                        for (ptr = ifr.ifr_name; *ptr; ptr++)
 532                                                if (*ptr == ':')
 533                                                        found_colon++;
 534                                        if (found_colon && ptr[-1] == '-')
 535                                                continue;
 536                                }
 537#endif
 538                        }
 539                        if (!(mask & A_SET_AFTER))
 540                                continue;
 541                        mask = N_SET;
 542                } /* if (mask & ARG_MASK) */
 543
 544                xioctl(sockfd, SIOCGIFFLAGS, &ifr);
 545                selector = op->selector;
 546                if (mask & SET_MASK)
 547                        ifr.ifr_flags |= selector;
 548                else
 549                        ifr.ifr_flags &= ~selector;
 550                xioctl(sockfd, SIOCSIFFLAGS, &ifr);
 551        } /* while () */
 552
 553        if (ENABLE_FEATURE_CLEAN_UP)
 554                close(sockfd);
 555        return 0;
 556}
 557