LXR busybox/networking/udhcp/common.c

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
   4 *
   5 * Licensed under GPLv2, see file LICENSE in this source tree.
   6 */
   7#include "common.h"
   8
   9#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
  10unsigned dhcp_verbose;
  11#endif
  12
  13const uint8_t MAC_BCAST_ADDR[6] ALIGN2 = {
  14        0xff, 0xff, 0xff, 0xff, 0xff, 0xff
  15};
  16
  17/* Supported options are easily added here.
  18 * See RFC2132 for more options.
  19 * OPTION_REQ: these options are requested by udhcpc (unless -o).
  20 */
  21const struct dhcp_optflag dhcp_optflags[] = {
  22        /* flags                                    code */
  23        { OPTION_IP                   | OPTION_REQ, 0x01 }, /* DHCP_SUBNET        */
  24        { OPTION_S32                              , 0x02 }, /* DHCP_TIME_OFFSET   */
  25        { OPTION_IP | OPTION_LIST     | OPTION_REQ, 0x03 }, /* DHCP_ROUTER        */
  26//      { OPTION_IP | OPTION_LIST                 , 0x04 }, /* DHCP_TIME_SERVER   */
  27//      { OPTION_IP | OPTION_LIST                 , 0x05 }, /* DHCP_NAME_SERVER   */
  28        { OPTION_IP | OPTION_LIST     | OPTION_REQ, 0x06 }, /* DHCP_DNS_SERVER    */
  29//      { OPTION_IP | OPTION_LIST                 , 0x07 }, /* DHCP_LOG_SERVER    */
  30//      { OPTION_IP | OPTION_LIST                 , 0x08 }, /* DHCP_COOKIE_SERVER */
  31        { OPTION_IP | OPTION_LIST                 , 0x09 }, /* DHCP_LPR_SERVER    */
  32        { OPTION_STRING               | OPTION_REQ, 0x0c }, /* DHCP_HOST_NAME     */
  33        { OPTION_U16                              , 0x0d }, /* DHCP_BOOT_SIZE     */
  34        { OPTION_STRING               | OPTION_REQ, 0x0f }, /* DHCP_DOMAIN_NAME   */
  35        { OPTION_IP                               , 0x10 }, /* DHCP_SWAP_SERVER   */
  36        { OPTION_STRING                           , 0x11 }, /* DHCP_ROOT_PATH     */
  37        { OPTION_U8                               , 0x17 }, /* DHCP_IP_TTL        */
  38        { OPTION_U16                              , 0x1a }, /* DHCP_MTU           */
  39        { OPTION_IP                   | OPTION_REQ, 0x1c }, /* DHCP_BROADCAST     */
  40        { OPTION_IP_PAIR | OPTION_LIST            , 0x21 }, /* DHCP_ROUTES        */
  41        { OPTION_STRING                           , 0x28 }, /* DHCP_NIS_DOMAIN    */
  42        { OPTION_IP | OPTION_LIST                 , 0x29 }, /* DHCP_NIS_SERVER    */
  43        { OPTION_IP | OPTION_LIST     | OPTION_REQ, 0x2a }, /* DHCP_NTP_SERVER    */
  44        { OPTION_IP | OPTION_LIST                 , 0x2c }, /* DHCP_WINS_SERVER   */
  45        { OPTION_U32                              , 0x33 }, /* DHCP_LEASE_TIME    */
  46        { OPTION_IP                               , 0x36 }, /* DHCP_SERVER_ID     */
  47        { OPTION_STRING                           , 0x38 }, /* DHCP_ERR_MESSAGE   */
  48//TODO: must be combined with 'sname' and 'file' handling:
  49        { OPTION_STRING                           , 0x42 }, /* DHCP_TFTP_SERVER_NAME */
  50        { OPTION_STRING                           , 0x43 }, /* DHCP_BOOT_FILE     */
  51//TODO: not a string, but a set of LASCII strings:
  52//      { OPTION_STRING                           , 0x4D }, /* DHCP_USER_CLASS    */
  53#if ENABLE_FEATURE_UDHCP_RFC3397
  54        { OPTION_DNS_STRING | OPTION_LIST         , 0x77 }, /* DHCP_DOMAIN_SEARCH */
  55        { OPTION_SIP_SERVERS                      , 0x78 }, /* DHCP_SIP_SERVERS   */
  56#endif
  57        { OPTION_STATIC_ROUTES                    , 0x79 }, /* DHCP_STATIC_ROUTES */
  58#if ENABLE_FEATURE_UDHCP_8021Q
  59        { OPTION_U16                              , 0x84 }, /* DHCP_VLAN_ID       */
  60        { OPTION_U8                               , 0x85 }, /* DHCP_VLAN_PRIORITY */
  61#endif
  62        { OPTION_STATIC_ROUTES                    , 0xf9 }, /* DHCP_MS_STATIC_ROUTES */
  63        { OPTION_STRING                           , 0xfc }, /* DHCP_WPAD          */
  64
  65        /* Options below have no match in dhcp_option_strings[],
  66         * are not passed to dhcpc scripts, and cannot be specified
  67         * with "option XXX YYY" syntax in dhcpd config file.
  68         * These entries are only used internally by udhcp[cd]
  69         * to correctly encode options into packets.
  70         */
  71
  72        { OPTION_IP                               , 0x32 }, /* DHCP_REQUESTED_IP  */
  73        { OPTION_U8                               , 0x35 }, /* DHCP_MESSAGE_TYPE  */
  74        { OPTION_U16                              , 0x39 }, /* DHCP_MAX_SIZE      */
  75//looks like these opts will work just fine even without these defs:
  76//      { OPTION_STRING                           , 0x3c }, /* DHCP_VENDOR        */
  77//      /* not really a string: */
  78//      { OPTION_STRING                           , 0x3d }, /* DHCP_CLIENT_ID     */
  79        { 0, 0 } /* zeroed terminating entry */
  80};
  81
  82/* Used for converting options from incoming packets to env variables
  83 * for udhcpc stript, and for setting options for udhcpd via
  84 * "opt OPTION_NAME OPTION_VALUE" directives in udhcpd.conf file.
  85 */
  86/* Must match dhcp_optflags[] order */
  87const char dhcp_option_strings[] ALIGN1 =
  88        "subnet" "\0"      /* DHCP_SUBNET         */
  89        "timezone" "\0"    /* DHCP_TIME_OFFSET    */
  90        "router" "\0"      /* DHCP_ROUTER         */
  91//      "timesrv" "\0"     /* DHCP_TIME_SERVER    */
  92//      "namesrv" "\0"     /* DHCP_NAME_SERVER    */
  93        "dns" "\0"         /* DHCP_DNS_SERVER     */
  94//      "logsrv" "\0"      /* DHCP_LOG_SERVER     */
  95//      "cookiesrv" "\0"   /* DHCP_COOKIE_SERVER  */
  96        "lprsrv" "\0"      /* DHCP_LPR_SERVER     */
  97        "hostname" "\0"    /* DHCP_HOST_NAME      */
  98        "bootsize" "\0"    /* DHCP_BOOT_SIZE      */
  99        "domain" "\0"      /* DHCP_DOMAIN_NAME    */
 100        "swapsrv" "\0"     /* DHCP_SWAP_SERVER    */
 101        "rootpath" "\0"    /* DHCP_ROOT_PATH      */
 102        "ipttl" "\0"       /* DHCP_IP_TTL         */
 103        "mtu" "\0"         /* DHCP_MTU            */
 104        "broadcast" "\0"   /* DHCP_BROADCAST      */
 105        "routes" "\0"      /* DHCP_ROUTES         */
 106        "nisdomain" "\0"   /* DHCP_NIS_DOMAIN     */
 107        "nissrv" "\0"      /* DHCP_NIS_SERVER     */
 108        "ntpsrv" "\0"      /* DHCP_NTP_SERVER     */
 109        "wins" "\0"        /* DHCP_WINS_SERVER    */
 110        "lease" "\0"       /* DHCP_LEASE_TIME     */
 111        "serverid" "\0"    /* DHCP_SERVER_ID      */
 112        "message" "\0"     /* DHCP_ERR_MESSAGE    */
 113        "tftp" "\0"        /* DHCP_TFTP_SERVER_NAME */
 114        "bootfile" "\0"    /* DHCP_BOOT_FILE      */
 115//      "userclass" "\0"   /* DHCP_USER_CLASS     */
 116#if ENABLE_FEATURE_UDHCP_RFC3397
 117        "search" "\0"      /* DHCP_DOMAIN_SEARCH  */
 118// doesn't work in udhcpd.conf since OPTION_SIP_SERVERS
 119// is not handled yet by "string->option" conversion code:
 120        "sipsrv" "\0"      /* DHCP_SIP_SERVERS    */
 121#endif
 122// doesn't work in udhcpd.conf since OPTION_STATIC_ROUTES
 123// is not handled yet by "string->option" conversion code:
 124        "staticroutes" "\0"/* DHCP_STATIC_ROUTES  */
 125#if ENABLE_FEATURE_UDHCP_8021Q
 126        "vlanid" "\0"      /* DHCP_VLAN_ID        */
 127        "vlanpriority" "\0"/* DHCP_VLAN_PRIORITY  */
 128#endif
 129        "msstaticroutes""\0"/* DHCP_MS_STATIC_ROUTES */
 130        "wpad" "\0"        /* DHCP_WPAD           */
 131        ;
 132
 133/* Lengths of the option types in binary form.
 134 * Used by:
 135 * udhcp_str2optset: to determine how many bytes to allocate.
 136 * xmalloc_optname_optval: to estimate string length
 137 * from binary option length: (option[LEN] / dhcp_option_lengths[opt_type])
 138 * is the number of elements, multiply in by one element's string width
 139 * (len_of_option_as_string[opt_type]) and you know how wide string you need.
 140 */
 141const uint8_t dhcp_option_lengths[] ALIGN1 = {
 142        [OPTION_IP] =      4,
 143        [OPTION_IP_PAIR] = 8,
 144//      [OPTION_BOOLEAN] = 1,
 145        [OPTION_STRING] =  1,  /* ignored by udhcp_str2optset */
 146#if ENABLE_FEATURE_UDHCP_RFC3397
 147        [OPTION_DNS_STRING] = 1,  /* ignored by both udhcp_str2optset and xmalloc_optname_optval */
 148        [OPTION_SIP_SERVERS] = 1,
 149#endif
 150        [OPTION_U8] =      1,
 151        [OPTION_U16] =     2,
 152//      [OPTION_S16] =     2,
 153        [OPTION_U32] =     4,
 154        [OPTION_S32] =     4,
 155        /* Just like OPTION_STRING, we use minimum length here */
 156        [OPTION_STATIC_ROUTES] = 5,
 157};
 158
 159
 160#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2
 161static void log_option(const char *pfx, const uint8_t *opt)
 162{
 163        if (dhcp_verbose >= 2) {
 164                char buf[256 * 2 + 2];
 165                *bin2hex(buf, (void*) (opt + OPT_DATA), opt[OPT_LEN]) = '\0';
 166                bb_info_msg("%s: 0x%02x %s", pfx, opt[OPT_CODE], buf);
 167        }
 168}
 169#else
 170# define log_option(pfx, opt) ((void)0)
 171#endif
 172
 173unsigned FAST_FUNC udhcp_option_idx(const char *name)
 174{
 175        int n = index_in_strings(dhcp_option_strings, name);
 176        if (n >= 0)
 177                return n;
 178
 179        {
 180                char buf[sizeof(dhcp_option_strings)];
 181                char *d = buf;
 182                const char *s = dhcp_option_strings;
 183                while (s < dhcp_option_strings + sizeof(dhcp_option_strings) - 2) {
 184                        *d++ = (*s == '\0' ? ' ' : *s);
 185                        s++;
 186                }
 187                *d = '\0';
 188                bb_error_msg_and_die("unknown option '%s', known options: %s", name, buf);
 189        }
 190}
 191
 192/* Get an option with bounds checking (warning, result is not aligned) */
 193uint8_t* FAST_FUNC udhcp_get_option(struct dhcp_packet *packet, int code)
 194{
 195        uint8_t *optionptr;
 196        int len;
 197        int rem;
 198        int overload = 0;
 199        enum {
 200                FILE_FIELD101  = FILE_FIELD  * 0x101,
 201                SNAME_FIELD101 = SNAME_FIELD * 0x101,
 202        };
 203
 204        /* option bytes: [code][len][data1][data2]..[dataLEN] */
 205        optionptr = packet->options;
 206        rem = sizeof(packet->options);
 207        while (1) {
 208                if (rem <= 0) {
 209                        bb_error_msg("bad packet, malformed option field");
 210                        return NULL;
 211                }
 212                if (optionptr[OPT_CODE] == DHCP_PADDING) {
 213                        rem--;
 214                        optionptr++;
 215                        continue;
 216                }
 217                if (optionptr[OPT_CODE] == DHCP_END) {
 218                        if ((overload & FILE_FIELD101) == FILE_FIELD) {
 219                                /* can use packet->file, and didn't look at it yet */
 220                                overload |= FILE_FIELD101; /* "we looked at it" */
 221                                optionptr = packet->file;
 222                                rem = sizeof(packet->file);
 223                                continue;
 224                        }
 225                        if ((overload & SNAME_FIELD101) == SNAME_FIELD) {
 226                                /* can use packet->sname, and didn't look at it yet */
 227                                overload |= SNAME_FIELD101; /* "we looked at it" */
 228                                optionptr = packet->sname;
 229                                rem = sizeof(packet->sname);
 230                                continue;
 231                        }
 232                        break;
 233                }
 234                len = 2 + optionptr[OPT_LEN];
 235                rem -= len;
 236                if (rem < 0)
 237                        continue; /* complain and return NULL */
 238
 239                if (optionptr[OPT_CODE] == code) {
 240                        log_option("Option found", optionptr);
 241                        return optionptr + OPT_DATA;
 242                }
 243
 244                if (optionptr[OPT_CODE] == DHCP_OPTION_OVERLOAD) {
 245                        overload |= optionptr[OPT_DATA];
 246                        /* fall through */
 247                }
 248                optionptr += len;
 249        }
 250
 251        /* log3 because udhcpc uses it a lot - very noisy */
 252        log3("Option 0x%02x not found", code);
 253        return NULL;
 254}
 255
 256/* Return the position of the 'end' option (no bounds checking) */
 257int FAST_FUNC udhcp_end_option(uint8_t *optionptr)
 258{
 259        int i = 0;
 260
 261        while (optionptr[i] != DHCP_END) {
 262                if (optionptr[i] != DHCP_PADDING)
 263                        i += optionptr[i + OPT_LEN] + OPT_DATA-1;
 264                i++;
 265        }
 266        return i;
 267}
 268
 269/* Add an option (supplied in binary form) to the options.
 270 * Option format: [code][len][data1][data2]..[dataLEN]
 271 */
 272void FAST_FUNC udhcp_add_binary_option(struct dhcp_packet *packet, uint8_t *addopt)
 273{
 274        unsigned len;
 275        uint8_t *optionptr = packet->options;
 276        unsigned end = udhcp_end_option(optionptr);
 277
 278        len = OPT_DATA + addopt[OPT_LEN];
 279        /* end position + (option code/length + addopt length) + end option */
 280        if (end + len + 1 >= DHCP_OPTIONS_BUFSIZE) {
 281//TODO: learn how to use overflow option if we exhaust packet->options[]
 282                bb_error_msg("option 0x%02x did not fit into the packet",
 283                                addopt[OPT_CODE]);
 284                return;
 285        }
 286        log_option("Adding option", addopt);
 287        memcpy(optionptr + end, addopt, len);
 288        optionptr[end + len] = DHCP_END;
 289}
 290
 291/* Add an one to four byte option to a packet */
 292void FAST_FUNC udhcp_add_simple_option(struct dhcp_packet *packet, uint8_t code, uint32_t data)
 293{
 294        const struct dhcp_optflag *dh;
 295
 296        for (dh = dhcp_optflags; dh->code; dh++) {
 297                if (dh->code == code) {
 298                        uint8_t option[6], len;
 299
 300                        option[OPT_CODE] = code;
 301                        len = dhcp_option_lengths[dh->flags & OPTION_TYPE_MASK];
 302                        option[OPT_LEN] = len;
 303                        if (BB_BIG_ENDIAN)
 304                                data <<= 8 * (4 - len);
 305                        /* Assignment is unaligned! */
 306                        move_to_unaligned32(&option[OPT_DATA], data);
 307                        udhcp_add_binary_option(packet, option);
 308                        return;
 309                }
 310        }
 311
 312        bb_error_msg("can't add option 0x%02x", code);
 313}
 314
 315/* Find option 'code' in opt_list */
 316struct option_set* FAST_FUNC udhcp_find_option(struct option_set *opt_list, uint8_t code)
 317{
 318        while (opt_list && opt_list->data[OPT_CODE] < code)
 319                opt_list = opt_list->next;
 320
 321        if (opt_list && opt_list->data[OPT_CODE] == code)
 322                return opt_list;
 323        return NULL;
 324}
 325
 326/* Parse string to IP in network order */
 327int FAST_FUNC udhcp_str2nip(const char *str, void *arg)
 328{
 329        len_and_sockaddr *lsa;
 330
 331        lsa = host_and_af2sockaddr(str, 0, AF_INET);
 332        if (!lsa)
 333                return 0;
 334        *(uint32_t*)arg = lsa->u.sin.sin_addr.s_addr;
 335        free(lsa);
 336        return 1;
 337}
 338
 339/* udhcp_str2optset:
 340 * Parse string option representation to binary form and add it to opt_list.
 341 * Called to parse "udhcpc -x OPTNAME:OPTVAL"
 342 * and to parse udhcpd.conf's "opt OPTNAME OPTVAL" directives.
 343 */
 344/* helper for the helper */
 345static char *allocate_tempopt_if_needed(
 346                const struct dhcp_optflag *optflag,
 347                char *buffer,
 348                int *length_p)
 349{
 350        char *allocated = NULL;
 351        if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_BIN) {
 352                const char *end;
 353                allocated = xstrdup(buffer); /* more than enough */
 354                end = hex2bin(allocated, buffer, 255);
 355                if (errno)
 356                        bb_error_msg_and_die("malformed hex string '%s'", buffer);
 357                *length_p = end - allocated;
 358        }
 359        return allocated;
 360}
 361/* helper: add an option to the opt_list */
 362static NOINLINE void attach_option(
 363                struct option_set **opt_list,
 364                const struct dhcp_optflag *optflag,
 365                char *buffer,
 366                int length)
 367{
 368        struct option_set *existing, *new, **curr;
 369        char *allocated = NULL;
 370
 371        existing = udhcp_find_option(*opt_list, optflag->code);
 372        if (!existing) {
 373                log2("Attaching option %02x to list", optflag->code);
 374                allocated = allocate_tempopt_if_needed(optflag, buffer, &length);
 375#if ENABLE_FEATURE_UDHCP_RFC3397
 376                if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_DNS_STRING) {
 377                        /* reuse buffer and length for RFC1035-formatted string */
 378                        allocated = buffer = (char *)dname_enc(NULL, 0, buffer, &length);
 379                }
 380#endif
 381                /* make a new option */
 382                new = xmalloc(sizeof(*new));
 383                new->data = xmalloc(length + OPT_DATA);
 384                new->data[OPT_CODE] = optflag->code;
 385                new->data[OPT_LEN] = length;
 386                memcpy(new->data + OPT_DATA, (allocated ? allocated : buffer), length);
 387
 388                curr = opt_list;
 389                while (*curr && (*curr)->data[OPT_CODE] < optflag->code)
 390                        curr = &(*curr)->next;
 391
 392                new->next = *curr;
 393                *curr = new;
 394                goto ret;
 395        }
 396
 397        if (optflag->flags & OPTION_LIST) {
 398                unsigned old_len;
 399
 400                /* add it to an existing option */
 401                log2("Attaching option %02x to existing member of list", optflag->code);
 402                allocated = allocate_tempopt_if_needed(optflag, buffer, &length);
 403                old_len = existing->data[OPT_LEN];
 404#if ENABLE_FEATURE_UDHCP_RFC3397
 405                if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_DNS_STRING) {
 406                        /* reuse buffer and length for RFC1035-formatted string */
 407                        allocated = buffer = (char *)dname_enc(existing->data + OPT_DATA, old_len, buffer, &length);
 408                }
 409#endif
 410                if (old_len + length < 255) {
 411                        /* actually 255 is ok too, but adding a space can overlow it */
 412
 413                        existing->data = xrealloc(existing->data, OPT_DATA + 1 + old_len + length);
 414                        if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_STRING) {
 415                                /* add space separator between STRING options in a list */
 416                                existing->data[OPT_DATA + old_len] = ' ';
 417                                old_len++;
 418                        }
 419                        memcpy(existing->data + OPT_DATA + old_len, buffer, length);
 420                        existing->data[OPT_LEN] = old_len + length;
 421                } /* else, ignore the data, we could put this in a second option in the future */
 422        } /* else, ignore the new data */
 423
 424 ret:
 425        free(allocated);
 426}
 427
 428int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg)
 429{
 430        struct option_set **opt_list = arg;
 431        char *opt, *val, *endptr;
 432        char *str;
 433        const struct dhcp_optflag *optflag;
 434        struct dhcp_optflag bin_optflag;
 435        unsigned optcode;
 436        int retval, length;
 437        char buffer[8] ALIGNED(4);
 438        uint16_t *result_u16 = (uint16_t *) buffer;
 439        uint32_t *result_u32 = (uint32_t *) buffer;
 440
 441        /* Cheat, the only *const* str possible is "" */
 442        str = (char *) const_str;
 443        opt = strtok(str, " \t=");
 444        if (!opt)
 445                return 0;
 446
 447        optcode = bb_strtou(opt, NULL, 0);
 448        if (!errno && optcode < 255) {
 449                /* Raw (numeric) option code */
 450                bin_optflag.flags = OPTION_BIN;
 451                bin_optflag.code = optcode;
 452                optflag = &bin_optflag;
 453        } else {
 454                optflag = &dhcp_optflags[udhcp_option_idx(opt)];
 455        }
 456
 457        retval = 0;
 458        do {
 459                val = strtok(NULL, ", \t");
 460                if (!val)
 461                        break;
 462                length = dhcp_option_lengths[optflag->flags & OPTION_TYPE_MASK];
 463                retval = 0;
 464                opt = buffer; /* new meaning for variable opt */
 465                switch (optflag->flags & OPTION_TYPE_MASK) {
 466                case OPTION_IP:
 467                        retval = udhcp_str2nip(val, buffer);
 468                        break;
 469                case OPTION_IP_PAIR:
 470                        retval = udhcp_str2nip(val, buffer);
 471                        val = strtok(NULL, ", \t/-");
 472                        if (!val)
 473                                retval = 0;
 474                        if (retval)
 475                                retval = udhcp_str2nip(val, buffer + 4);
 476                        break;
 477                case OPTION_STRING:
 478#if ENABLE_FEATURE_UDHCP_RFC3397
 479                case OPTION_DNS_STRING:
 480#endif
 481                        length = strnlen(val, 254);
 482                        if (length > 0) {
 483                                opt = val;
 484                                retval = 1;
 485                        }
 486                        break;
 487//              case OPTION_BOOLEAN: {
 488//                      static const char no_yes[] ALIGN1 = "no\0yes\0";
 489//                      buffer[0] = retval = index_in_strings(no_yes, val);
 490//                      retval++; /* 0 - bad; 1: "no" 2: "yes" */
 491//                      break;
 492//              }
 493                case OPTION_U8:
 494                        buffer[0] = strtoul(val, &endptr, 0);
 495                        retval = (endptr[0] == '\0');
 496                        break;
 497                /* htonX are macros in older libc's, using temp var
 498                 * in code below for safety */
 499                /* TODO: use bb_strtoX? */
 500                case OPTION_U16: {
 501                        unsigned long tmp = strtoul(val, &endptr, 0);
 502                        *result_u16 = htons(tmp);
 503                        retval = (endptr[0] == '\0' /*&& tmp < 0x10000*/);
 504                        break;
 505                }
 506//              case OPTION_S16: {
 507//                      long tmp = strtol(val, &endptr, 0);
 508//                      *result_u16 = htons(tmp);
 509//                      retval = (endptr[0] == '\0');
 510//                      break;
 511//              }
 512                case OPTION_U32: {
 513                        unsigned long tmp = strtoul(val, &endptr, 0);
 514                        *result_u32 = htonl(tmp);
 515                        retval = (endptr[0] == '\0');
 516                        break;
 517                }
 518                case OPTION_S32: {
 519                        long tmp = strtol(val, &endptr, 0);
 520                        *result_u32 = htonl(tmp);
 521                        retval = (endptr[0] == '\0');
 522                        break;
 523                }
 524                case OPTION_BIN: /* handled in attach_option() */
 525                        opt = val;
 526                        retval = 1;
 527                default:
 528                        break;
 529                }
 530                if (retval)
 531                        attach_option(opt_list, optflag, opt, length);
 532        } while (retval && optflag->flags & OPTION_LIST);
 533
 534        return retval;
 535}
 536