release/src/router/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
  10 unsigned dhcp_verbose;
  11 #endif
  12
  13 const 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  */
  21 const 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         { OPTION_IP                   | OPTION_REQ, 0x1c }, /* DHCP_BROADCAST     */
  40         { OPTION_IP_PAIR | OPTION_LIST            , 0x21 }, /* DHCP_ROUTES        */
  41         { OPTION_STRING_HOST                      , 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_HOST                      , 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 | OPTION_LIST      , 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_6RD                              , 0xd4 }, /* DHCP_6RD           */
  63         { OPTION_STATIC_ROUTES | OPTION_LIST      , 0xf9 }, /* DHCP_MS_STATIC_ROUTES */
  64         { OPTION_STRING                           , 0xfc }, /* DHCP_WPAD          */
  65
  66         /* Options below have no match in dhcp_option_strings[],
  67          * are not passed to dhcpc scripts, and cannot be specified
  68          * with "option XXX YYY" syntax in dhcpd config file.
  69          * These entries are only used internally by udhcp[cd]
  70          * to correctly encode options into packets.
  71          */
  72
  73         { OPTION_IP                               , 0x32 }, /* DHCP_REQUESTED_IP  */
  74         { OPTION_U8                               , 0x35 }, /* DHCP_MESSAGE_TYPE  */
  75         { OPTION_U16                              , 0x39 }, /* DHCP_MAX_SIZE      */
  76 //looks like these opts will work just fine even without these defs:
  77 //      { OPTION_STRING                           , 0x3c }, /* DHCP_VENDOR        */
  78 //      /* not really a string: */
  79 //      { OPTION_STRING                           , 0x3d }, /* DHCP_CLIENT_ID     */
  80         { 0, 0 } /* zeroed terminating entry */
  81 };
  82
  83 /* Used for converting options from incoming packets to env variables
  84  * for udhcpc stript, and for setting options for udhcpd via
  85  * "opt OPTION_NAME OPTION_VALUE" directives in udhcpd.conf file.
  86  */
  87 /* Must match dhcp_optflags[] order */
  88 const char dhcp_option_strings[] ALIGN1 =
  89         "subnet" "\0"      /* DHCP_SUBNET         */
  90         "timezone" "\0"    /* DHCP_TIME_OFFSET    */
  91         "router" "\0"      /* DHCP_ROUTER         */
  92 //      "timesrv" "\0"     /* DHCP_TIME_SERVER    */
  93 //      "namesrv" "\0"     /* DHCP_NAME_SERVER    */
  94         "dns" "\0"         /* DHCP_DNS_SERVER     */
  95 //      "logsrv" "\0"      /* DHCP_LOG_SERVER     */
  96 //      "cookiesrv" "\0"   /* DHCP_COOKIE_SERVER  */
  97         "lprsrv" "\0"      /* DHCP_LPR_SERVER     */
  98         "hostname" "\0"    /* DHCP_HOST_NAME      */
  99         "bootsize" "\0"    /* DHCP_BOOT_SIZE      */
 100         "domain" "\0"      /* DHCP_DOMAIN_NAME    */
 101         "swapsrv" "\0"     /* DHCP_SWAP_SERVER    */
 102         "rootpath" "\0"    /* DHCP_ROOT_PATH      */
 103         "ipttl" "\0"       /* DHCP_IP_TTL         */
 104         "mtu" "\0"         /* DHCP_MTU            */
 105         "broadcast" "\0"   /* DHCP_BROADCAST      */
 106         "routes" "\0"      /* DHCP_ROUTES         */
 107         "nisdomain" "\0"   /* DHCP_NIS_DOMAIN     */
 108         "nissrv" "\0"      /* DHCP_NIS_SERVER     */
 109         "ntpsrv" "\0"      /* DHCP_NTP_SERVER     */
 110         "wins" "\0"        /* DHCP_WINS_SERVER    */
 111         "lease" "\0"       /* DHCP_LEASE_TIME     */
 112         "serverid" "\0"    /* DHCP_SERVER_ID      */
 113         "message" "\0"     /* DHCP_ERR_MESSAGE    */
 114         "tftp" "\0"        /* DHCP_TFTP_SERVER_NAME */
 115         "bootfile" "\0"    /* DHCP_BOOT_FILE      */
 116 //      "userclass" "\0"   /* DHCP_USER_CLASS     */
 117 #if ENABLE_FEATURE_UDHCP_RFC3397
 118         "search" "\0"      /* DHCP_DOMAIN_SEARCH  */
 119 // doesn't work in udhcpd.conf since OPTION_SIP_SERVERS
 120 // is not handled yet by "string->option" conversion code:
 121         "sipsrv" "\0"      /* DHCP_SIP_SERVERS    */
 122 #endif
 123         "staticroutes" "\0"/* DHCP_STATIC_ROUTES  */
 124 #if ENABLE_FEATURE_UDHCP_8021Q
 125         "vlanid" "\0"      /* DHCP_VLAN_ID        */
 126         "vlanpriority" "\0"/* DHCP_VLAN_PRIORITY  */
 127 #endif
 128         "ip6rd" "\0"       /* DHCP_6RD            */
 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  */
 141 const 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         [OPTION_STRING_HOST] = 1,  /* ignored by udhcp_str2optset */
 147 #if ENABLE_FEATURE_UDHCP_RFC3397
 148         [OPTION_DNS_STRING] = 1,  /* ignored by both udhcp_str2optset and xmalloc_optname_optval */
 149         [OPTION_SIP_SERVERS] = 1,
 150 #endif
 151         [OPTION_U8] =      1,
 152         [OPTION_U16] =     2,
 153 //      [OPTION_S16] =     2,
 154         [OPTION_U32] =     4,
 155         [OPTION_S32] =     4,
 156         /* Just like OPTION_STRING, we use minimum length here */
 157         [OPTION_STATIC_ROUTES] = 5,
 158         [OPTION_6RD] =    22,  /* ignored by udhcp_str2optset */
 159 };
 160
 161
 162 #if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2
 163 static void log_option(const char *pfx, const uint8_t *opt)
 164 {
 165         if (dhcp_verbose >= 2) {
 166                 char buf[256 * 2 + 2];
 167                 *bin2hex(buf, (void*) (opt + OPT_DATA), opt[OPT_LEN]) = '\0';
 168                 bb_info_msg("%s: 0x%02x %s", pfx, opt[OPT_CODE], buf);
 169         }
 170 }
 171 #else
 172 # define log_option(pfx, opt) ((void)0)
 173 #endif
 174
 175 unsigned FAST_FUNC udhcp_option_idx(const char *name)
 176 {
 177         int n = index_in_strings(dhcp_option_strings, name);
 178         if (n >= 0)
 179                 return n;
 180
 181         {
 182                 char buf[sizeof(dhcp_option_strings)];
 183                 char *d = buf;
 184                 const char *s = dhcp_option_strings;
 185                 while (s < dhcp_option_strings + sizeof(dhcp_option_strings) - 2) {
 186                         *d++ = (*s == '\0' ? ' ' : *s);
 187                         s++;
 188                 }
 189                 *d = '\0';
 190                 bb_error_msg_and_die("unknown option '%s', known options: %s", name, buf);
 191         }
 192 }
 193
 194 /* Get an option with bounds checking (warning, result is not aligned) */
 195 uint8_t* FAST_FUNC udhcp_get_option(struct dhcp_packet *packet, int code)
 196 {
 197         uint8_t *optionptr;
 198         int len;
 199         int rem;
 200         int overload = 0;
 201         enum {
 202                 FILE_FIELD101  = FILE_FIELD  * 0x101,
 203                 SNAME_FIELD101 = SNAME_FIELD * 0x101,
 204         };
 205
 206         /* option bytes: [code][len][data1][data2]..[dataLEN] */
 207         optionptr = packet->options;
 208         rem = sizeof(packet->options);
 209         while (1) {
 210                 if (rem <= 0) {
 211                         bb_error_msg("bad packet, malformed option field");
 212                         return NULL;
 213                 }
 214                 if (optionptr[OPT_CODE] == DHCP_PADDING) {
 215                         rem--;
 216                         optionptr++;
 217                         continue;
 218                 }
 219                 if (optionptr[OPT_CODE] == DHCP_END) {
 220                         if ((overload & FILE_FIELD101) == FILE_FIELD) {
 221                                 /* can use packet->file, and didn't look at it yet */
 222                                 overload |= FILE_FIELD101; /* "we looked at it" */
 223                                 optionptr = packet->file;
 224                                 rem = sizeof(packet->file);
 225                                 continue;
 226                         }
 227                         if ((overload & SNAME_FIELD101) == SNAME_FIELD) {
 228                                 /* can use packet->sname, and didn't look at it yet */
 229                                 overload |= SNAME_FIELD101; /* "we looked at it" */
 230                                 optionptr = packet->sname;
 231                                 rem = sizeof(packet->sname);
 232                                 continue;
 233                         }
 234                         break;
 235                 }
 236                 len = 2 + optionptr[OPT_LEN];
 237                 rem -= len;
 238                 if (rem < 0)
 239                         continue; /* complain and return NULL */
 240
 241                 if (optionptr[OPT_CODE] == code) {
 242                         log_option("Option found", optionptr);
 243                         return optionptr + OPT_DATA;
 244                 }
 245
 246                 if (optionptr[OPT_CODE] == DHCP_OPTION_OVERLOAD) {
 247                         overload |= optionptr[OPT_DATA];
 248                         /* fall through */
 249                 }
 250                 optionptr += len;
 251         }
 252
 253         /* log3 because udhcpc uses it a lot - very noisy */
 254         log3("Option 0x%02x not found", code);
 255         return NULL;
 256 }
 257
 258 /* Return the position of the 'end' option (no bounds checking) */
 259 int FAST_FUNC udhcp_end_option(uint8_t *optionptr)
 260 {
 261         int i = 0;
 262
 263         while (optionptr[i] != DHCP_END) {
 264                 if (optionptr[i] != DHCP_PADDING)
 265                         i += optionptr[i + OPT_LEN] + OPT_DATA-1;
 266                 i++;
 267         }
 268         return i;
 269 }
 270
 271 /* Add an option (supplied in binary form) to the options.
 272  * Option format: [code][len][data1][data2]..[dataLEN]
 273  */
 274 void FAST_FUNC udhcp_add_binary_option(struct dhcp_packet *packet, uint8_t *addopt)
 275 {
 276         unsigned len;
 277         uint8_t *optionptr = packet->options;
 278         unsigned end = udhcp_end_option(optionptr);
 279
 280         len = OPT_DATA + addopt[OPT_LEN];
 281         /* end position + (option code/length + addopt length) + end option */
 282         if (end + len + 1 >= DHCP_OPTIONS_BUFSIZE) {
 283 //TODO: learn how to use overflow option if we exhaust packet->options[]
 284                 bb_error_msg("option 0x%02x did not fit into the packet",
 285                                 addopt[OPT_CODE]);
 286                 return;
 287         }
 288         log_option("Adding option", addopt);
 289         memcpy(optionptr + end, addopt, len);
 290         optionptr[end + len] = DHCP_END;
 291 }
 292
 293 /* Add an one to four byte option to a packet */
 294 void FAST_FUNC udhcp_add_simple_option(struct dhcp_packet *packet, uint8_t code, uint32_t data)
 295 {
 296         const struct dhcp_optflag *dh;
 297
 298         for (dh = dhcp_optflags; dh->code; dh++) {
 299                 if (dh->code == code) {
 300                         uint8_t option[6], len;
 301
 302                         option[OPT_CODE] = code;
 303                         len = dhcp_option_lengths[dh->flags & OPTION_TYPE_MASK];
 304                         option[OPT_LEN] = len;
 305                         if (BB_BIG_ENDIAN)
 306                                 data <<= 8 * (4 - len);
 307                         /* Assignment is unaligned! */
 308                         move_to_unaligned32(&option[OPT_DATA], data);
 309                         udhcp_add_binary_option(packet, option);
 310                         return;
 311                 }
 312         }
 313
 314         bb_error_msg("can't add option 0x%02x", code);
 315 }
 316
 317 /* Find option 'code' in opt_list */
 318 struct option_set* FAST_FUNC udhcp_find_option(struct option_set *opt_list, uint8_t code)
 319 {
 320         while (opt_list && opt_list->data[OPT_CODE] < code)
 321                 opt_list = opt_list->next;
 322
 323         if (opt_list && opt_list->data[OPT_CODE] == code)
 324                 return opt_list;
 325         return NULL;
 326 }
 327
 328 /* Parse string to IP in network order */
 329 int FAST_FUNC udhcp_str2nip(const char *str, void *arg)
 330 {
 331         len_and_sockaddr *lsa;
 332
 333         lsa = host_and_af2sockaddr(str, 0, AF_INET);
 334         if (!lsa)
 335                 return 0;
 336         /* arg maybe unaligned */
 337         move_to_unaligned32((uint32_t*)arg, lsa->u.sin.sin_addr.s_addr);
 338         free(lsa);
 339         return 1;
 340 }
 341
 342 /* udhcp_str2optset:
 343  * Parse string option representation to binary form and add it to opt_list.
 344  * Called to parse "udhcpc -x OPTNAME:OPTVAL"
 345  * and to parse udhcpd.conf's "opt OPTNAME OPTVAL" directives.
 346  */
 347 /* helper for the helper */
 348 static char *allocate_tempopt_if_needed(
 349                 const struct dhcp_optflag *optflag,
 350                 char *buffer,
 351                 int *length_p)
 352 {
 353         char *allocated = NULL;
 354         if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_BIN) {
 355                 const char *end;
 356                 allocated = xstrdup(buffer); /* more than enough */
 357                 end = hex2bin(allocated, buffer, 255);
 358                 if (errno)
 359                         bb_error_msg_and_die("malformed hex string '%s'", buffer);
 360                 *length_p = end - allocated;
 361         }
 362         return allocated;
 363 }
 364 /* helper: add an option to the opt_list */
 365 static NOINLINE void attach_option(
 366                 struct option_set **opt_list,
 367                 const struct dhcp_optflag *optflag,
 368                 char *buffer,
 369                 int length)
 370 {
 371         struct option_set *existing, *new, **curr;
 372         char *allocated = NULL;
 373
 374         existing = udhcp_find_option(*opt_list, optflag->code);
 375         if (!existing) {
 376                 log2("Attaching option %02x to list", optflag->code);
 377                 allocated = allocate_tempopt_if_needed(optflag, buffer, &length);
 378 #if ENABLE_FEATURE_UDHCP_RFC3397
 379                 if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_DNS_STRING) {
 380                         /* reuse buffer and length for RFC1035-formatted string */
 381                         allocated = buffer = (char *)dname_enc(NULL, 0, buffer, &length);
 382                 }
 383 #endif
 384                 /* make a new option */
 385                 new = xmalloc(sizeof(*new));
 386                 new->data = xmalloc(length + OPT_DATA);
 387                 new->data[OPT_CODE] = optflag->code;
 388                 new->data[OPT_LEN] = length;
 389                 memcpy(new->data + OPT_DATA, (allocated ? allocated : buffer), length);
 390
 391                 curr = opt_list;
 392                 while (*curr && (*curr)->data[OPT_CODE] < optflag->code)
 393                         curr = &(*curr)->next;
 394
 395                 new->next = *curr;
 396                 *curr = new;
 397                 goto ret;
 398         }
 399
 400         if (optflag->flags & OPTION_LIST) {
 401                 unsigned old_len;
 402
 403                 /* add it to an existing option */
 404                 log2("Attaching option %02x to existing member of list", optflag->code);
 405                 allocated = allocate_tempopt_if_needed(optflag, buffer, &length);
 406                 old_len = existing->data[OPT_LEN];
 407 #if ENABLE_FEATURE_UDHCP_RFC3397
 408                 if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_DNS_STRING) {
 409                         /* reuse buffer and length for RFC1035-formatted string */
 410                         allocated = buffer = (char *)dname_enc(existing->data + OPT_DATA, old_len, buffer, &length);
 411                 }
 412 #endif
 413                 if (old_len + length < 255) {
 414                         /* actually 255 is ok too, but adding a space can overlow it */
 415
 416                         existing->data = xrealloc(existing->data, OPT_DATA + 1 + old_len + length);
 417                         if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_STRING
 418                          || (optflag->flags & OPTION_TYPE_MASK) == OPTION_STRING_HOST
 419                         ) {
 420                                 /* add space separator between STRING options in a list */
 421                                 existing->data[OPT_DATA + old_len] = ' ';
 422                                 old_len++;
 423                         }
 424                         memcpy(existing->data + OPT_DATA + old_len, buffer, length);
 425                         existing->data[OPT_LEN] = old_len + length;
 426                 } /* else, ignore the data, we could put this in a second option in the future */
 427         } /* else, ignore the new data */
 428
 429  ret:
 430         free(allocated);
 431 }
 432
 433 int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg)
 434 {
 435         struct option_set **opt_list = arg;
 436         char *opt, *val;
 437         char *str;
 438         const struct dhcp_optflag *optflag;
 439         struct dhcp_optflag bin_optflag;
 440         unsigned optcode;
 441         int retval, length;
 442         /* IP_PAIR needs 8 bytes, STATIC_ROUTES needs 9 max */
 443         char buffer[9] ALIGNED(4);
 444         uint16_t *result_u16 = (uint16_t *) buffer;
 445         uint32_t *result_u32 = (uint32_t *) buffer;
 446
 447         /* Cheat, the only *const* str possible is "" */
 448         str = (char *) const_str;
 449         opt = strtok(str, " \t=");
 450         if (!opt)
 451                 return 0;
 452
 453         optcode = bb_strtou(opt, NULL, 0);
 454         if (!errno && optcode < 255) {
 455                 /* Raw (numeric) option code */
 456                 bin_optflag.flags = OPTION_BIN;
 457                 bin_optflag.code = optcode;
 458                 optflag = &bin_optflag;
 459         } else {
 460                 optflag = &dhcp_optflags[udhcp_option_idx(opt)];
 461         }
 462
 463         retval = 0;
 464         do {
 465                 val = strtok(NULL, ", \t");
 466                 if (!val)
 467                         break;
 468                 length = dhcp_option_lengths[optflag->flags & OPTION_TYPE_MASK];
 469                 retval = 0;
 470                 opt = buffer; /* new meaning for variable opt */
 471                 switch (optflag->flags & OPTION_TYPE_MASK) {
 472                 case OPTION_IP:
 473                         retval = udhcp_str2nip(val, buffer);
 474                         break;
 475                 case OPTION_IP_PAIR:
 476                         retval = udhcp_str2nip(val, buffer);
 477                         val = strtok(NULL, ", \t/-");
 478                         if (!val)
 479                                 retval = 0;
 480                         if (retval)
 481                                 retval = udhcp_str2nip(val, buffer + 4);
 482                         break;
 483                 case OPTION_STRING:
 484                 case OPTION_STRING_HOST:
 485 #if ENABLE_FEATURE_UDHCP_RFC3397
 486                 case OPTION_DNS_STRING:
 487 #endif
 488                         length = strnlen(val, 254);
 489                         if (length > 0) {
 490                                 opt = val;
 491                                 retval = 1;
 492                         }
 493                         break;
 494 //              case OPTION_BOOLEAN: {
 495 //                      static const char no_yes[] ALIGN1 = "no\0yes\0";
 496 //                      buffer[0] = retval = index_in_strings(no_yes, val);
 497 //                      retval++; /* 0 - bad; 1: "no" 2: "yes" */
 498 //                      break;
 499 //              }
 500                 case OPTION_U8:
 501                         buffer[0] = bb_strtou32(val, NULL, 0);
 502                         retval = (errno == 0);
 503                         break;
 504                 /* htonX are macros in older libc's, using temp var
 505                  * in code below for safety */
 506                 /* TODO: use bb_strtoX? */
 507                 case OPTION_U16: {
 508                         uint32_t tmp = bb_strtou32(val, NULL, 0);
 509                         *result_u16 = htons(tmp);
 510                         retval = (errno == 0 /*&& tmp < 0x10000*/);
 511                         break;
 512                 }
 513 //              case OPTION_S16: {
 514 //                      long tmp = bb_strtoi32(val, NULL, 0);
 515 //                      *result_u16 = htons(tmp);
 516 //                      retval = (errno == 0);
 517 //                      break;
 518 //              }
 519                 case OPTION_U32: {
 520                         uint32_t tmp = bb_strtou32(val, NULL, 0);
 521                         *result_u32 = htonl(tmp);
 522                         retval = (errno == 0);
 523                         break;
 524                 }
 525                 case OPTION_S32: {
 526                         int32_t tmp = bb_strtoi32(val, NULL, 0);
 527                         *result_u32 = htonl(tmp);
 528                         retval = (errno == 0);
 529                         break;
 530                 }
 531                 case OPTION_STATIC_ROUTES: {
 532                         /* Input: "a.b.c.d/m" */
 533                         /* Output: mask(1 byte),pfx(0-4 bytes),gw(4 bytes) */
 534                         unsigned mask;
 535                         char *slash = strchr(val, '/');
 536                         if (slash) {
 537                                 *slash = '\0';
 538                                 retval = udhcp_str2nip(val, buffer + 1);
 539                                 buffer[0] = mask = bb_strtou(slash + 1, NULL, 10);
 540                                 val = strtok(NULL, ", \t/-");
 541                                 if (!val || mask > 32 || errno)
 542                                         retval = 0;
 543                                 if (retval) {
 544                                         length = ((mask + 7) >> 3) + 5;
 545                                         retval = udhcp_str2nip(val, buffer + (length - 4));
 546                                 }
 547                         }
 548                         break;
 549                 }
 550                 case OPTION_BIN: /* handled in attach_option() */
 551                         opt = val;
 552                         retval = 1;
 553                 default:
 554                         break;
 555                 }
 556                 if (retval)
 557                         attach_option(opt_list, optflag, opt, length);
 558         } while (retval && (optflag->flags & OPTION_LIST));
 559
 560         return retval;
 561 }
 562
 563 /* note: ip is a pointer to an IPv6 in network order, possibly misaliged */
 564 int FAST_FUNC sprint_nip6(char *dest, /*const char *pre,*/ const uint8_t *ip)
 565 {
 566         char hexstrbuf[16 * 2];
 567         bin2hex(hexstrbuf, (void*)ip, 16);
 568         return sprintf(dest, /* "%s" */
 569                 "%.4s:%.4s:%.4s:%.4s:%.4s:%.4s:%.4s:%.4s",
 570                 /* pre, */
 571                 hexstrbuf + 0 * 4,
 572                 hexstrbuf + 1 * 4,
 573                 hexstrbuf + 2 * 4,
 574                 hexstrbuf + 3 * 4,
 575                 hexstrbuf + 4 * 4,
 576                 hexstrbuf + 5 * 4,
 577                 hexstrbuf + 6 * 4,
 578                 hexstrbuf + 7 * 4
 579         );
 580 }