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_HOST          | OPTION_REQ, 0x0c }, /* DHCP_HOST_NAME     */
  33        { OPTION_U16                              , 0x0d }, /* DHCP_BOOT_SIZE     */
  34        { OPTION_STRING_HOST          | 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//TODO: why do we request DHCP_BROADCAST? Can't we assume that
  40//in the unlikely case it is different from typical N.N.255.255,
  41//server would let us know anyway?
  42        { OPTION_IP                   | OPTION_REQ, 0x1c }, /* DHCP_BROADCAST     */
  43        { OPTION_IP_PAIR | OPTION_LIST            , 0x21 }, /* DHCP_ROUTES        */
  44        { OPTION_STRING_HOST                      , 0x28 }, /* DHCP_NIS_DOMAIN    */
  45        { OPTION_IP | OPTION_LIST                 , 0x29 }, /* DHCP_NIS_SERVER    */
  46        { OPTION_IP | OPTION_LIST     | OPTION_REQ, 0x2a }, /* DHCP_NTP_SERVER    */
  47        { OPTION_IP | OPTION_LIST                 , 0x2c }, /* DHCP_WINS_SERVER   */
  48        { OPTION_U32                              , 0x33 }, /* DHCP_LEASE_TIME    */
  49        { OPTION_IP                               , 0x36 }, /* DHCP_SERVER_ID     */
  50        { OPTION_STRING                           , 0x38 }, /* DHCP_ERR_MESSAGE   */
  51//TODO: must be combined with 'sname' and 'file' handling:
  52        { OPTION_STRING_HOST                      , 0x42 }, /* DHCP_TFTP_SERVER_NAME */
  53        { OPTION_STRING                           , 0x43 }, /* DHCP_BOOT_FILE     */
  54//TODO: not a string, but a set of LASCII strings:
  55//      { OPTION_STRING                           , 0x4D }, /* DHCP_USER_CLASS    */
  56#if ENABLE_FEATURE_UDHCP_RFC3397
  57        { OPTION_DNS_STRING | OPTION_LIST         , 0x77 }, /* DHCP_DOMAIN_SEARCH */
  58        { OPTION_SIP_SERVERS                      , 0x78 }, /* DHCP_SIP_SERVERS   */
  59#endif
  60        { OPTION_STATIC_ROUTES | OPTION_LIST      , 0x79 }, /* DHCP_STATIC_ROUTES */
  61#if ENABLE_FEATURE_UDHCP_8021Q
  62        { OPTION_U16                              , 0x84 }, /* DHCP_VLAN_ID       */
  63        { OPTION_U8                               , 0x85 }, /* DHCP_VLAN_PRIORITY */
  64#endif
  65        { OPTION_STRING                           , 0xd1 }, /* DHCP_PXE_CONF_FILE */
  66        { OPTION_STRING                           , 0xd2 }, /* DHCP_PXE_PATH_PREFIX */
  67        { OPTION_6RD                              , 0xd4 }, /* DHCP_6RD           */
  68        { OPTION_STATIC_ROUTES | OPTION_LIST      , 0xf9 }, /* DHCP_MS_STATIC_ROUTES */
  69        { OPTION_STRING                           , 0xfc }, /* DHCP_WPAD          */
  70
  71        /* Options below have no match in dhcp_option_strings[],
  72         * are not passed to dhcpc scripts, and cannot be specified
  73         * with "option XXX YYY" syntax in dhcpd config file.
  74         * These entries are only used internally by udhcp[cd]
  75         * to correctly encode options into packets.
  76         */
  77
  78        { OPTION_IP                               , 0x32 }, /* DHCP_REQUESTED_IP  */
  79        { OPTION_U8                               , 0x35 }, /* DHCP_MESSAGE_TYPE  */
  80        { OPTION_U16                              , 0x39 }, /* DHCP_MAX_SIZE      */
  81//looks like these opts will work just fine even without these defs:
  82//      { OPTION_STRING                           , 0x3c }, /* DHCP_VENDOR        */
  83//      /* not really a string: */
  84//      { OPTION_STRING                           , 0x3d }, /* DHCP_CLIENT_ID     */
  85        { 0, 0 } /* zeroed terminating entry */
  86};
  87
  88/* Used for converting options from incoming packets to env variables
  89 * for udhcpc stript, and for setting options for udhcpd via
  90 * "opt OPTION_NAME OPTION_VALUE" directives in udhcpd.conf file.
  91 */
  92/* Must match dhcp_optflags[] order */
  93const char dhcp_option_strings[] ALIGN1 =
  94        "subnet" "\0"      /* DHCP_SUBNET         */
  95        "timezone" "\0"    /* DHCP_TIME_OFFSET    */
  96        "router" "\0"      /* DHCP_ROUTER         */
  97//      "timesrv" "\0"     /* DHCP_TIME_SERVER    */
  98//      "namesrv" "\0"     /* DHCP_NAME_SERVER    */
  99        "dns" "\0"         /* DHCP_DNS_SERVER     */
 100//      "logsrv" "\0"      /* DHCP_LOG_SERVER     */
 101//      "cookiesrv" "\0"   /* DHCP_COOKIE_SERVER  */
 102        "lprsrv" "\0"      /* DHCP_LPR_SERVER     */
 103        "hostname" "\0"    /* DHCP_HOST_NAME      */
 104        "bootsize" "\0"    /* DHCP_BOOT_SIZE      */
 105        "domain" "\0"      /* DHCP_DOMAIN_NAME    */
 106        "swapsrv" "\0"     /* DHCP_SWAP_SERVER    */
 107        "rootpath" "\0"    /* DHCP_ROOT_PATH      */
 108        "ipttl" "\0"       /* DHCP_IP_TTL         */
 109        "mtu" "\0"         /* DHCP_MTU            */
 110        "broadcast" "\0"   /* DHCP_BROADCAST      */
 111        "routes" "\0"      /* DHCP_ROUTES         */
 112        "nisdomain" "\0"   /* DHCP_NIS_DOMAIN     */
 113        "nissrv" "\0"      /* DHCP_NIS_SERVER     */
 114        "ntpsrv" "\0"      /* DHCP_NTP_SERVER     */
 115        "wins" "\0"        /* DHCP_WINS_SERVER    */
 116        "lease" "\0"       /* DHCP_LEASE_TIME     */
 117        "serverid" "\0"    /* DHCP_SERVER_ID      */
 118        "message" "\0"     /* DHCP_ERR_MESSAGE    */
 119        "tftp" "\0"        /* DHCP_TFTP_SERVER_NAME */
 120        "bootfile" "\0"    /* DHCP_BOOT_FILE      */
 121//      "userclass" "\0"   /* DHCP_USER_CLASS     */
 122#if ENABLE_FEATURE_UDHCP_RFC3397
 123        "search" "\0"      /* DHCP_DOMAIN_SEARCH  */
 124// doesn't work in udhcpd.conf since OPTION_SIP_SERVERS
 125// is not handled yet by "string->option" conversion code:
 126        "sipsrv" "\0"      /* DHCP_SIP_SERVERS    */
 127#endif
 128        "staticroutes" "\0"/* DHCP_STATIC_ROUTES  */
 129#if ENABLE_FEATURE_UDHCP_8021Q
 130        "vlanid" "\0"      /* DHCP_VLAN_ID        */
 131        "vlanpriority" "\0"/* DHCP_VLAN_PRIORITY  */
 132#endif
 133        "pxeconffile" "\0" /* DHCP_PXE_CONF_FILE  */
 134        "pxepathprefix" "\0" /* DHCP_PXE_PATH_PREFIX  */
 135        "ip6rd" "\0"       /* DHCP_6RD            */
 136        "msstaticroutes""\0"/* DHCP_MS_STATIC_ROUTES */
 137        "wpad" "\0"        /* DHCP_WPAD           */
 138        ;
 139
 140/* Lengths of the option types in binary form.
 141 * Used by:
 142 * udhcp_str2optset: to determine how many bytes to allocate.
 143 * xmalloc_optname_optval: to estimate string length
 144 * from binary option length: (option[LEN] / dhcp_option_lengths[opt_type])
 145 * is the number of elements, multiply in by one element's string width
 146 * (len_of_option_as_string[opt_type]) and you know how wide string you need.
 147 */
 148const uint8_t dhcp_option_lengths[] ALIGN1 = {
 149        [OPTION_IP] =      4,
 150        [OPTION_IP_PAIR] = 8,
 151//      [OPTION_BOOLEAN] = 1,
 152        [OPTION_STRING] =  1,  /* ignored by udhcp_str2optset */
 153        [OPTION_STRING_HOST] = 1,  /* ignored by udhcp_str2optset */
 154#if ENABLE_FEATURE_UDHCP_RFC3397
 155        [OPTION_DNS_STRING] = 1,  /* ignored by both udhcp_str2optset and xmalloc_optname_optval */
 156        [OPTION_SIP_SERVERS] = 1,
 157#endif
 158        [OPTION_U8] =      1,
 159        [OPTION_U16] =     2,
 160//      [OPTION_S16] =     2,
 161        [OPTION_U32] =     4,
 162        [OPTION_S32] =     4,
 163        /* Just like OPTION_STRING, we use minimum length here */
 164        [OPTION_STATIC_ROUTES] = 5,
 165        [OPTION_6RD] =    22,  /* ignored by udhcp_str2optset */
 166};
 167
 168
 169#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2
 170static void log_option(const char *pfx, const uint8_t *opt)
 171{
 172        if (dhcp_verbose >= 2) {
 173                char buf[256 * 2 + 2];
 174                *bin2hex(buf, (void*) (opt + OPT_DATA), opt[OPT_LEN]) = '\0';
 175                bb_info_msg("%s: 0x%02x %s", pfx, opt[OPT_CODE], buf);
 176        }
 177}
 178#else
 179# define log_option(pfx, opt) ((void)0)
 180#endif
 181
 182unsigned FAST_FUNC udhcp_option_idx(const char *name)
 183{
 184        int n = index_in_strings(dhcp_option_strings, name);
 185        if (n >= 0)
 186                return n;
 187
 188        {
 189                char buf[sizeof(dhcp_option_strings)];
 190                char *d = buf;
 191                const char *s = dhcp_option_strings;
 192                while (s < dhcp_option_strings + sizeof(dhcp_option_strings) - 2) {
 193                        *d++ = (*s == '\0' ? ' ' : *s);
 194                        s++;
 195                }
 196                *d = '\0';
 197                bb_error_msg_and_die("unknown option '%s', known options: %s", name, buf);
 198        }
 199}
 200
 201/* Get an option with bounds checking (warning, result is not aligned) */
 202uint8_t* FAST_FUNC udhcp_get_option(struct dhcp_packet *packet, int code)
 203{
 204        uint8_t *optionptr;
 205        int len;
 206        int rem;
 207        int overload = 0;
 208        enum {
 209                FILE_FIELD101  = FILE_FIELD  * 0x101,
 210                SNAME_FIELD101 = SNAME_FIELD * 0x101,
 211        };
 212
 213        /* option bytes: [code][len][data1][data2]..[dataLEN] */
 214        optionptr = packet->options;
 215        rem = sizeof(packet->options);
 216        while (1) {
 217                if (rem <= 0) {
 218                        bb_error_msg("bad packet, malformed option field");
 219                        return NULL;
 220                }
 221                if (optionptr[OPT_CODE] == DHCP_PADDING) {
 222                        rem--;
 223                        optionptr++;
 224                        continue;
 225                }
 226                if (optionptr[OPT_CODE] == DHCP_END) {
 227                        if ((overload & FILE_FIELD101) == FILE_FIELD) {
 228                                /* can use packet->file, and didn't look at it yet */
 229                                overload |= FILE_FIELD101; /* "we looked at it" */
 230                                optionptr = packet->file;
 231                                rem = sizeof(packet->file);
 232                                continue;
 233                        }
 234                        if ((overload & SNAME_FIELD101) == SNAME_FIELD) {
 235                                /* can use packet->sname, and didn't look at it yet */
 236                                overload |= SNAME_FIELD101; /* "we looked at it" */
 237                                optionptr = packet->sname;
 238                                rem = sizeof(packet->sname);
 239                                continue;
 240                        }
 241                        break;
 242                }
 243                len = 2 + optionptr[OPT_LEN];
 244                rem -= len;
 245                if (rem < 0)
 246                        continue; /* complain and return NULL */
 247
 248                if (optionptr[OPT_CODE] == code) {
 249                        log_option("Option found", optionptr);
 250                        return optionptr + OPT_DATA;
 251                }
 252
 253                if (optionptr[OPT_CODE] == DHCP_OPTION_OVERLOAD) {
 254                        overload |= optionptr[OPT_DATA];
 255                        /* fall through */
 256                }
 257                optionptr += len;
 258        }
 259
 260        /* log3 because udhcpc uses it a lot - very noisy */
 261        log3("Option 0x%02x not found", code);
 262        return NULL;
 263}
 264
 265/* Return the position of the 'end' option (no bounds checking) */
 266int FAST_FUNC udhcp_end_option(uint8_t *optionptr)
 267{
 268        int i = 0;
 269
 270        while (optionptr[i] != DHCP_END) {
 271                if (optionptr[i] != DHCP_PADDING)
 272                        i += optionptr[i + OPT_LEN] + OPT_DATA-1;
 273                i++;
 274        }
 275        return i;
 276}
 277
 278/* Add an option (supplied in binary form) to the options.
 279 * Option format: [code][len][data1][data2]..[dataLEN]
 280 */
 281void FAST_FUNC udhcp_add_binary_option(struct dhcp_packet *packet, uint8_t *addopt)
 282{
 283        unsigned len;
 284        uint8_t *optionptr = packet->options;
 285        unsigned end = udhcp_end_option(optionptr);
 286
 287        len = OPT_DATA + addopt[OPT_LEN];
 288        /* end position + (option code/length + addopt length) + end option */
 289        if (end + len + 1 >= DHCP_OPTIONS_BUFSIZE) {
 290//TODO: learn how to use overflow option if we exhaust packet->options[]
 291                bb_error_msg("option 0x%02x did not fit into the packet",
 292                                addopt[OPT_CODE]);
 293                return;
 294        }
 295        log_option("Adding option", addopt);
 296        memcpy(optionptr + end, addopt, len);
 297        optionptr[end + len] = DHCP_END;
 298}
 299
 300/* Add an one to four byte option to a packet */
 301void FAST_FUNC udhcp_add_simple_option(struct dhcp_packet *packet, uint8_t code, uint32_t data)
 302{
 303        const struct dhcp_optflag *dh;
 304
 305        for (dh = dhcp_optflags; dh->code; dh++) {
 306                if (dh->code == code) {
 307                        uint8_t option[6], len;
 308
 309                        option[OPT_CODE] = code;
 310                        len = dhcp_option_lengths[dh->flags & OPTION_TYPE_MASK];
 311                        option[OPT_LEN] = len;
 312                        if (BB_BIG_ENDIAN)
 313                                data <<= 8 * (4 - len);
 314                        /* Assignment is unaligned! */
 315                        move_to_unaligned32(&option[OPT_DATA], data);
 316                        udhcp_add_binary_option(packet, option);
 317                        return;
 318                }
 319        }
 320
 321        bb_error_msg("can't add option 0x%02x", code);
 322}
 323
 324/* Find option 'code' in opt_list */
 325struct option_set* FAST_FUNC udhcp_find_option(struct option_set *opt_list, uint8_t code)
 326{
 327        while (opt_list && opt_list->data[OPT_CODE] < code)
 328                opt_list = opt_list->next;
 329
 330        if (opt_list && opt_list->data[OPT_CODE] == code)
 331                return opt_list;
 332        return NULL;
 333}
 334
 335/* Parse string to IP in network order */
 336int FAST_FUNC udhcp_str2nip(const char *str, void *arg)
 337{
 338        len_and_sockaddr *lsa;
 339
 340        lsa = host_and_af2sockaddr(str, 0, AF_INET);
 341        if (!lsa)
 342                return 0;
 343        /* arg maybe unaligned */
 344        move_to_unaligned32((uint32_t*)arg, lsa->u.sin.sin_addr.s_addr);
 345        free(lsa);
 346        return 1;
 347}
 348
 349/* udhcp_str2optset:
 350 * Parse string option representation to binary form and add it to opt_list.
 351 * Called to parse "udhcpc -x OPTNAME:OPTVAL"
 352 * and to parse udhcpd.conf's "opt OPTNAME OPTVAL" directives.
 353 */
 354/* helper for the helper */
 355static char *allocate_tempopt_if_needed(
 356                const struct dhcp_optflag *optflag,
 357                char *buffer,
 358                int *length_p)
 359{
 360        char *allocated = NULL;
 361        if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_BIN) {
 362                const char *end;
 363                allocated = xstrdup(buffer); /* more than enough */
 364                end = hex2bin(allocated, buffer, 255);
 365                if (errno)
 366                        bb_error_msg_and_die("malformed hex string '%s'", buffer);
 367                *length_p = end - allocated;
 368        }
 369        return allocated;
 370}
 371/* helper: add an option to the opt_list */
 372static NOINLINE void attach_option(
 373                struct option_set **opt_list,
 374                const struct dhcp_optflag *optflag,
 375                char *buffer,
 376                int length)
 377{
 378        struct option_set *existing;
 379        char *allocated;
 380
 381        allocated = allocate_tempopt_if_needed(optflag, buffer, &length);
 382#if ENABLE_FEATURE_UDHCP_RFC3397
 383        if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_DNS_STRING) {
 384                /* reuse buffer and length for RFC1035-formatted string */
 385                allocated = buffer = (char *)dname_enc(NULL, 0, buffer, &length);
 386        }
 387#endif
 388
 389        existing = udhcp_find_option(*opt_list, optflag->code);
 390        if (!existing) {
 391                struct option_set *new, **curr;
 392
 393                /* make a new option */
 394                log2("Attaching option %02x to list", optflag->code);
 395                new = xmalloc(sizeof(*new));
 396                new->data = xmalloc(length + OPT_DATA);
 397                new->data[OPT_CODE] = optflag->code;
 398                new->data[OPT_LEN] = length;
 399                memcpy(new->data + OPT_DATA, (allocated ? allocated : buffer), length);
 400
 401                curr = opt_list;
 402                while (*curr && (*curr)->data[OPT_CODE] < optflag->code)
 403                        curr = &(*curr)->next;
 404
 405                new->next = *curr;
 406                *curr = new;
 407                goto ret;
 408        }
 409
 410        if (optflag->flags & OPTION_LIST) {
 411                unsigned old_len;
 412
 413                /* add it to an existing option */
 414                log2("Attaching option %02x to existing member of list", optflag->code);
 415                old_len = existing->data[OPT_LEN];
 416                if (old_len + length < 255) {
 417                        /* actually 255 is ok too, but adding a space can overlow it */
 418
 419                        existing->data = xrealloc(existing->data, OPT_DATA + 1 + old_len + length);
 420                        if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_STRING
 421                         || (optflag->flags & OPTION_TYPE_MASK) == OPTION_STRING_HOST
 422                        ) {
 423                                /* add space separator between STRING options in a list */
 424                                existing->data[OPT_DATA + old_len] = ' ';
 425                                old_len++;
 426                        }
 427                        memcpy(existing->data + OPT_DATA + old_len, (allocated ? allocated : buffer), length);
 428                        existing->data[OPT_LEN] = old_len + length;
 429                } /* else, ignore the data, we could put this in a second option in the future */
 430        } /* else, ignore the new data */
 431
 432 ret:
 433        free(allocated);
 434}
 435
 436int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg)
 437{
 438        struct option_set **opt_list = arg;
 439        char *opt, *val;
 440        char *str;
 441        const struct dhcp_optflag *optflag;
 442        struct dhcp_optflag bin_optflag;
 443        unsigned optcode;
 444        int retval, length;
 445        /* IP_PAIR needs 8 bytes, STATIC_ROUTES needs 9 max */
 446        char buffer[9] ALIGNED(4);
 447        uint16_t *result_u16 = (uint16_t *) buffer;
 448        uint32_t *result_u32 = (uint32_t *) buffer;
 449
 450        /* Cheat, the only *const* str possible is "" */
 451        str = (char *) const_str;
 452        opt = strtok(str, " \t=");
 453        if (!opt)
 454                return 0;
 455
 456        optcode = bb_strtou(opt, NULL, 0);
 457        if (!errno && optcode < 255) {
 458                /* Raw (numeric) option code */
 459                bin_optflag.flags = OPTION_BIN;
 460                bin_optflag.code = optcode;
 461                optflag = &bin_optflag;
 462        } else {
 463                optflag = &dhcp_optflags[udhcp_option_idx(opt)];
 464        }
 465
 466        retval = 0;
 467        do {
 468                val = strtok(NULL, ", \t");
 469                if (!val)
 470                        break;
 471                length = dhcp_option_lengths[optflag->flags & OPTION_TYPE_MASK];
 472                retval = 0;
 473                opt = buffer; /* new meaning for variable opt */
 474                switch (optflag->flags & OPTION_TYPE_MASK) {
 475                case OPTION_IP:
 476                        retval = udhcp_str2nip(val, buffer);
 477                        break;
 478                case OPTION_IP_PAIR:
 479                        retval = udhcp_str2nip(val, buffer);
 480                        val = strtok(NULL, ", \t/-");
 481                        if (!val)
 482                                retval = 0;
 483                        if (retval)
 484                                retval = udhcp_str2nip(val, buffer + 4);
 485                        break;
 486                case OPTION_STRING:
 487                case OPTION_STRING_HOST:
 488#if ENABLE_FEATURE_UDHCP_RFC3397
 489                case OPTION_DNS_STRING:
 490#endif
 491                        length = strnlen(val, 254);
 492                        if (length > 0) {
 493                                opt = val;
 494                                retval = 1;
 495                        }
 496                        break;
 497//              case OPTION_BOOLEAN: {
 498//                      static const char no_yes[] ALIGN1 = "no\0yes\0";
 499//                      buffer[0] = retval = index_in_strings(no_yes, val);
 500//                      retval++; /* 0 - bad; 1: "no" 2: "yes" */
 501//                      break;
 502//              }
 503                case OPTION_U8:
 504                        buffer[0] = bb_strtou32(val, NULL, 0);
 505                        retval = (errno == 0);
 506                        break;
 507                /* htonX are macros in older libc's, using temp var
 508                 * in code below for safety */
 509                /* TODO: use bb_strtoX? */
 510                case OPTION_U16: {
 511                        uint32_t tmp = bb_strtou32(val, NULL, 0);
 512                        *result_u16 = htons(tmp);
 513                        retval = (errno == 0 /*&& tmp < 0x10000*/);
 514                        break;
 515                }
 516//              case OPTION_S16: {
 517//                      long tmp = bb_strtoi32(val, NULL, 0);
 518//                      *result_u16 = htons(tmp);
 519//                      retval = (errno == 0);
 520//                      break;
 521//              }
 522                case OPTION_U32: {
 523                        uint32_t tmp = bb_strtou32(val, NULL, 0);
 524                        *result_u32 = htonl(tmp);
 525                        retval = (errno == 0);
 526                        break;
 527                }
 528                case OPTION_S32: {
 529                        int32_t tmp = bb_strtoi32(val, NULL, 0);
 530                        *result_u32 = htonl(tmp);
 531                        retval = (errno == 0);
 532                        break;
 533                }
 534                case OPTION_STATIC_ROUTES: {
 535                        /* Input: "a.b.c.d/m" */
 536                        /* Output: mask(1 byte),pfx(0-4 bytes),gw(4 bytes) */
 537                        unsigned mask;
 538                        char *slash = strchr(val, '/');
 539                        if (slash) {
 540                                *slash = '\0';
 541                                retval = udhcp_str2nip(val, buffer + 1);
 542                                buffer[0] = mask = bb_strtou(slash + 1, NULL, 10);
 543                                val = strtok(NULL, ", \t/-");
 544                                if (!val || mask > 32 || errno)
 545                                        retval = 0;
 546                                if (retval) {
 547                                        length = ((mask + 7) >> 3) + 5;
 548                                        retval = udhcp_str2nip(val, buffer + (length - 4));
 549                                }
 550                        }
 551                        break;
 552                }
 553                case OPTION_BIN: /* handled in attach_option() */
 554                        opt = val;
 555                        retval = 1;
 556                default:
 557                        break;
 558                }
 559                if (retval)
 560                        attach_option(opt_list, optflag, opt, length);
 561        } while (retval && (optflag->flags & OPTION_LIST));
 562
 563        return retval;
 564}
 565
 566/* note: ip is a pointer to an IPv6 in network order, possibly misaliged */
 567int FAST_FUNC sprint_nip6(char *dest, /*const char *pre,*/ const uint8_t *ip)
 568{
 569        char hexstrbuf[16 * 2];
 570        bin2hex(hexstrbuf, (void*)ip, 16);
 571        return sprintf(dest, /* "%s" */
 572                "%.4s:%.4s:%.4s:%.4s:%.4s:%.4s:%.4s:%.4s",
 573                /* pre, */
 574                hexstrbuf + 0 * 4,
 575                hexstrbuf + 1 * 4,
 576                hexstrbuf + 2 * 4,
 577                hexstrbuf + 3 * 4,
 578                hexstrbuf + 4 * 4,
 579                hexstrbuf + 5 * 4,
 580                hexstrbuf + 6 * 4,
 581                hexstrbuf + 7 * 4
 582        );
 583}
 584