contrib/tcpdump/print-bootp.c

   1 /*
   2  * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  */
  21
  22 /* \summary: BOOTP and IPv4 DHCP printer */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include "config.h"
  26 #endif
  27
  28 #include <netdissect-stdinc.h>
  29
  30 #include <string.h>
  31
  32 #include "netdissect.h"
  33 #include "addrtoname.h"
  34 #include "extract.h"
  35
  36 static const char tstr[] = " [|bootp]";
  37
  38 /*
  39  * Bootstrap Protocol (BOOTP).  RFC951 and RFC1048.
  40  *
  41  * This file specifies the "implementation-independent" BOOTP protocol
  42  * information which is common to both client and server.
  43  *
  44  * Copyright 1988 by Carnegie Mellon.
  45  *
  46  * Permission to use, copy, modify, and distribute this program for any
  47  * purpose and without fee is hereby granted, provided that this copyright
  48  * and permission notice appear on all copies and supporting documentation,
  49  * the name of Carnegie Mellon not be used in advertising or publicity
  50  * pertaining to distribution of the program without specific prior
  51  * permission, and notice be given in supporting documentation that copying
  52  * and distribution is by permission of Carnegie Mellon and Stanford
  53  * University.  Carnegie Mellon makes no representations about the
  54  * suitability of this software for any purpose.  It is provided "as is"
  55  * without express or implied warranty.
  56  */
  57
  58 struct bootp {
  59         uint8_t         bp_op;          /* packet opcode type */
  60         uint8_t         bp_htype;       /* hardware addr type */
  61         uint8_t         bp_hlen;        /* hardware addr length */
  62         uint8_t         bp_hops;        /* gateway hops */
  63         uint32_t        bp_xid;         /* transaction ID */
  64         uint16_t        bp_secs;        /* seconds since boot began */
  65         uint16_t        bp_flags;       /* flags - see bootp_flag_values[]
  66                                            in print-bootp.c */
  67         struct in_addr  bp_ciaddr;      /* client IP address */
  68         struct in_addr  bp_yiaddr;      /* 'your' IP address */
  69         struct in_addr  bp_siaddr;      /* server IP address */
  70         struct in_addr  bp_giaddr;      /* gateway IP address */
  71         uint8_t         bp_chaddr[16];  /* client hardware address */
  72         uint8_t         bp_sname[64];   /* server host name */
  73         uint8_t         bp_file[128];   /* boot file name */
  74         uint8_t         bp_vend[64];    /* vendor-specific area */
  75 } UNALIGNED;
  76
  77 #define BOOTPREPLY      2
  78 #define BOOTPREQUEST    1
  79
  80 /*
  81  * Vendor magic cookie (v_magic) for CMU
  82  */
  83 #define VM_CMU          "CMU"
  84
  85 /*
  86  * Vendor magic cookie (v_magic) for RFC1048
  87  */
  88 #define VM_RFC1048      { 99, 130, 83, 99 }
  89
  90 /*
  91  * RFC1048 tag values used to specify what information is being supplied in
  92  * the vendor field of the packet.
  93  */
  94
  95 #define TAG_PAD                 ((uint8_t)   0)
  96 #define TAG_SUBNET_MASK         ((uint8_t)   1)
  97 #define TAG_TIME_OFFSET         ((uint8_t)   2)
  98 #define TAG_GATEWAY             ((uint8_t)   3)
  99 #define TAG_TIME_SERVER         ((uint8_t)   4)
 100 #define TAG_NAME_SERVER         ((uint8_t)   5)
 101 #define TAG_DOMAIN_SERVER       ((uint8_t)   6)
 102 #define TAG_LOG_SERVER          ((uint8_t)   7)
 103 #define TAG_COOKIE_SERVER       ((uint8_t)   8)
 104 #define TAG_LPR_SERVER          ((uint8_t)   9)
 105 #define TAG_IMPRESS_SERVER      ((uint8_t)  10)
 106 #define TAG_RLP_SERVER          ((uint8_t)  11)
 107 #define TAG_HOSTNAME            ((uint8_t)  12)
 108 #define TAG_BOOTSIZE            ((uint8_t)  13)
 109 #define TAG_END                 ((uint8_t) 255)
 110 /* RFC1497 tags */
 111 #define TAG_DUMPPATH            ((uint8_t)  14)
 112 #define TAG_DOMAINNAME          ((uint8_t)  15)
 113 #define TAG_SWAP_SERVER         ((uint8_t)  16)
 114 #define TAG_ROOTPATH            ((uint8_t)  17)
 115 #define TAG_EXTPATH             ((uint8_t)  18)
 116 /* RFC2132 */
 117 #define TAG_IP_FORWARD          ((uint8_t)  19)
 118 #define TAG_NL_SRCRT            ((uint8_t)  20)
 119 #define TAG_PFILTERS            ((uint8_t)  21)
 120 #define TAG_REASS_SIZE          ((uint8_t)  22)
 121 #define TAG_DEF_TTL             ((uint8_t)  23)
 122 #define TAG_MTU_TIMEOUT         ((uint8_t)  24)
 123 #define TAG_MTU_TABLE           ((uint8_t)  25)
 124 #define TAG_INT_MTU             ((uint8_t)  26)
 125 #define TAG_LOCAL_SUBNETS       ((uint8_t)  27)
 126 #define TAG_BROAD_ADDR          ((uint8_t)  28)
 127 #define TAG_DO_MASK_DISC        ((uint8_t)  29)
 128 #define TAG_SUPPLY_MASK         ((uint8_t)  30)
 129 #define TAG_DO_RDISC            ((uint8_t)  31)
 130 #define TAG_RTR_SOL_ADDR        ((uint8_t)  32)
 131 #define TAG_STATIC_ROUTE        ((uint8_t)  33)
 132 #define TAG_USE_TRAILERS        ((uint8_t)  34)
 133 #define TAG_ARP_TIMEOUT         ((uint8_t)  35)
 134 #define TAG_ETH_ENCAP           ((uint8_t)  36)
 135 #define TAG_TCP_TTL             ((uint8_t)  37)
 136 #define TAG_TCP_KEEPALIVE       ((uint8_t)  38)
 137 #define TAG_KEEPALIVE_GO        ((uint8_t)  39)
 138 #define TAG_NIS_DOMAIN          ((uint8_t)  40)
 139 #define TAG_NIS_SERVERS         ((uint8_t)  41)
 140 #define TAG_NTP_SERVERS         ((uint8_t)  42)
 141 #define TAG_VENDOR_OPTS         ((uint8_t)  43)
 142 #define TAG_NETBIOS_NS          ((uint8_t)  44)
 143 #define TAG_NETBIOS_DDS         ((uint8_t)  45)
 144 #define TAG_NETBIOS_NODE        ((uint8_t)  46)
 145 #define TAG_NETBIOS_SCOPE       ((uint8_t)  47)
 146 #define TAG_XWIN_FS             ((uint8_t)  48)
 147 #define TAG_XWIN_DM             ((uint8_t)  49)
 148 #define TAG_NIS_P_DOMAIN        ((uint8_t)  64)
 149 #define TAG_NIS_P_SERVERS       ((uint8_t)  65)
 150 #define TAG_MOBILE_HOME         ((uint8_t)  68)
 151 #define TAG_SMPT_SERVER         ((uint8_t)  69)
 152 #define TAG_POP3_SERVER         ((uint8_t)  70)
 153 #define TAG_NNTP_SERVER         ((uint8_t)  71)
 154 #define TAG_WWW_SERVER          ((uint8_t)  72)
 155 #define TAG_FINGER_SERVER       ((uint8_t)  73)
 156 #define TAG_IRC_SERVER          ((uint8_t)  74)
 157 #define TAG_STREETTALK_SRVR     ((uint8_t)  75)
 158 #define TAG_STREETTALK_STDA     ((uint8_t)  76)
 159 /* DHCP options */
 160 #define TAG_REQUESTED_IP        ((uint8_t)  50)
 161 #define TAG_IP_LEASE            ((uint8_t)  51)
 162 #define TAG_OPT_OVERLOAD        ((uint8_t)  52)
 163 #define TAG_TFTP_SERVER         ((uint8_t)  66)
 164 #define TAG_BOOTFILENAME        ((uint8_t)  67)
 165 #define TAG_DHCP_MESSAGE        ((uint8_t)  53)
 166 #define TAG_SERVER_ID           ((uint8_t)  54)
 167 #define TAG_PARM_REQUEST        ((uint8_t)  55)
 168 #define TAG_MESSAGE             ((uint8_t)  56)
 169 #define TAG_MAX_MSG_SIZE        ((uint8_t)  57)
 170 #define TAG_RENEWAL_TIME        ((uint8_t)  58)
 171 #define TAG_REBIND_TIME         ((uint8_t)  59)
 172 #define TAG_VENDOR_CLASS        ((uint8_t)  60)
 173 #define TAG_CLIENT_ID           ((uint8_t)  61)
 174 /* RFC 2241 */
 175 #define TAG_NDS_SERVERS         ((uint8_t)  85)
 176 #define TAG_NDS_TREE_NAME       ((uint8_t)  86)
 177 #define TAG_NDS_CONTEXT         ((uint8_t)  87)
 178 /* RFC 2242 */
 179 #define TAG_NDS_IPDOMAIN        ((uint8_t)  62)
 180 #define TAG_NDS_IPINFO          ((uint8_t)  63)
 181 /* RFC 2485 */
 182 #define TAG_OPEN_GROUP_UAP      ((uint8_t)  98)
 183 /* RFC 2563 */
 184 #define TAG_DISABLE_AUTOCONF    ((uint8_t) 116)
 185 /* RFC 2610 */
 186 #define TAG_SLP_DA              ((uint8_t)  78)
 187 #define TAG_SLP_SCOPE           ((uint8_t)  79)
 188 /* RFC 2937 */
 189 #define TAG_NS_SEARCH           ((uint8_t) 117)
 190 /* RFC 3004 - The User Class Option for DHCP */
 191 #define TAG_USER_CLASS          ((uint8_t)  77)
 192 /* RFC 3011 */
 193 #define TAG_IP4_SUBNET_SELECT   ((uint8_t) 118)
 194 /* RFC 3442 */
 195 #define TAG_CLASSLESS_STATIC_RT ((uint8_t) 121)
 196 #define TAG_CLASSLESS_STA_RT_MS ((uint8_t) 249)
 197 /* RFC 5859 - TFTP Server Address Option for DHCPv4 */
 198 #define TAG_TFTP_SERVER_ADDRESS ((uint8_t) 150)
 199 /* ftp://ftp.isi.edu/.../assignments/bootp-dhcp-extensions */
 200 #define TAG_SLP_NAMING_AUTH     ((uint8_t)  80)
 201 #define TAG_CLIENT_FQDN         ((uint8_t)  81)
 202 #define TAG_AGENT_CIRCUIT       ((uint8_t)  82)
 203 #define TAG_AGENT_REMOTE        ((uint8_t)  83)
 204 #define TAG_AGENT_MASK          ((uint8_t)  84)
 205 #define TAG_TZ_STRING           ((uint8_t)  88)
 206 #define TAG_FQDN_OPTION         ((uint8_t)  89)
 207 #define TAG_AUTH                ((uint8_t)  90)
 208 #define TAG_VINES_SERVERS       ((uint8_t)  91)
 209 #define TAG_SERVER_RANK         ((uint8_t)  92)
 210 #define TAG_CLIENT_ARCH         ((uint8_t)  93)
 211 #define TAG_CLIENT_NDI          ((uint8_t)  94)
 212 #define TAG_CLIENT_GUID         ((uint8_t)  97)
 213 #define TAG_LDAP_URL            ((uint8_t)  95)
 214 #define TAG_6OVER4              ((uint8_t)  96)
 215 /* RFC 4833, TZ codes */
 216 #define TAG_TZ_PCODE            ((uint8_t) 100)
 217 #define TAG_TZ_TCODE            ((uint8_t) 101)
 218 #define TAG_IPX_COMPAT          ((uint8_t) 110)
 219 #define TAG_NETINFO_PARENT      ((uint8_t) 112)
 220 #define TAG_NETINFO_PARENT_TAG  ((uint8_t) 113)
 221 #define TAG_URL                 ((uint8_t) 114)
 222 #define TAG_FAILOVER            ((uint8_t) 115)
 223 #define TAG_EXTENDED_REQUEST    ((uint8_t) 126)
 224 #define TAG_EXTENDED_OPTION     ((uint8_t) 127)
 225 #define TAG_MUDURL              ((uint8_t) 161)
 226
 227 /* DHCP Message types (values for TAG_DHCP_MESSAGE option) */
 228 #define DHCPDISCOVER    1
 229 #define DHCPOFFER       2
 230 #define DHCPREQUEST     3
 231 #define DHCPDECLINE     4
 232 #define DHCPACK         5
 233 #define DHCPNAK         6
 234 #define DHCPRELEASE     7
 235 #define DHCPINFORM      8
 236
 237 /*
 238  * "vendor" data permitted for CMU bootp clients.
 239  */
 240
 241 struct cmu_vend {
 242         uint8_t         v_magic[4];     /* magic number */
 243         uint32_t        v_flags;        /* flags/opcodes, etc. */
 244         struct in_addr  v_smask;        /* Subnet mask */
 245         struct in_addr  v_dgate;        /* Default gateway */
 246         struct in_addr  v_dns1, v_dns2; /* Domain name servers */
 247         struct in_addr  v_ins1, v_ins2; /* IEN-116 name servers */
 248         struct in_addr  v_ts1, v_ts2;   /* Time servers */
 249         uint8_t         v_unused[24];   /* currently unused */
 250 } UNALIGNED;
 251
 252
 253 /* v_flags values */
 254 #define VF_SMASK        1       /* Subnet mask field contains valid data */
 255
 256 /* RFC 4702 DHCP Client FQDN Option */
 257
 258 #define CLIENT_FQDN_FLAGS_S     0x01
 259 #define CLIENT_FQDN_FLAGS_O     0x02
 260 #define CLIENT_FQDN_FLAGS_E     0x04
 261 #define CLIENT_FQDN_FLAGS_N     0x08
 262 /* end of original bootp.h */
 263
 264 static void rfc1048_print(netdissect_options *, const u_char *);
 265 static void cmu_print(netdissect_options *, const u_char *);
 266 static char *client_fqdn_flags(u_int flags);
 267
 268 static const struct tok bootp_flag_values[] = {
 269         { 0x8000,       "Broadcast" },
 270         { 0, NULL}
 271 };
 272
 273 static const struct tok bootp_op_values[] = {
 274         { BOOTPREQUEST, "Request" },
 275         { BOOTPREPLY,   "Reply" },
 276         { 0, NULL}
 277 };
 278
 279 /*
 280  * Print bootp requests
 281  */
 282 void
 283 bootp_print(netdissect_options *ndo,
 284             register const u_char *cp, u_int length)
 285 {
 286         register const struct bootp *bp;
 287         static const u_char vm_cmu[4] = VM_CMU;
 288         static const u_char vm_rfc1048[4] = VM_RFC1048;
 289
 290         bp = (const struct bootp *)cp;
 291         ND_TCHECK(bp->bp_op);
 292
 293         ND_PRINT((ndo, "BOOTP/DHCP, %s",
 294                   tok2str(bootp_op_values, "unknown (0x%02x)", bp->bp_op)));
 295
 296         ND_TCHECK(bp->bp_hlen);
 297         if (bp->bp_htype == 1 && bp->bp_hlen == 6 && bp->bp_op == BOOTPREQUEST) {
 298                 ND_TCHECK2(bp->bp_chaddr[0], 6);
 299                 ND_PRINT((ndo, " from %s", etheraddr_string(ndo, bp->bp_chaddr)));
 300         }
 301
 302         ND_PRINT((ndo, ", length %u", length));
 303
 304         if (!ndo->ndo_vflag)
 305                 return;
 306
 307         ND_TCHECK(bp->bp_secs);
 308
 309         /* The usual hardware address type is 1 (10Mb Ethernet) */
 310         if (bp->bp_htype != 1)
 311                 ND_PRINT((ndo, ", htype %d", bp->bp_htype));
 312
 313         /* The usual length for 10Mb Ethernet address is 6 bytes */
 314         if (bp->bp_htype != 1 || bp->bp_hlen != 6)
 315                 ND_PRINT((ndo, ", hlen %d", bp->bp_hlen));
 316
 317         /* Only print interesting fields */
 318         if (bp->bp_hops)
 319                 ND_PRINT((ndo, ", hops %d", bp->bp_hops));
 320         if (EXTRACT_32BITS(&bp->bp_xid))
 321                 ND_PRINT((ndo, ", xid 0x%x", EXTRACT_32BITS(&bp->bp_xid)));
 322         if (EXTRACT_16BITS(&bp->bp_secs))
 323                 ND_PRINT((ndo, ", secs %d", EXTRACT_16BITS(&bp->bp_secs)));
 324
 325         ND_TCHECK(bp->bp_flags);
 326         ND_PRINT((ndo, ", Flags [%s]",
 327                   bittok2str(bootp_flag_values, "none", EXTRACT_16BITS(&bp->bp_flags))));
 328         if (ndo->ndo_vflag > 1)
 329                 ND_PRINT((ndo, " (0x%04x)", EXTRACT_16BITS(&bp->bp_flags)));
 330
 331         /* Client's ip address */
 332         ND_TCHECK(bp->bp_ciaddr);
 333         if (EXTRACT_32BITS(&bp->bp_ciaddr.s_addr))
 334                 ND_PRINT((ndo, "\n\t  Client-IP %s", ipaddr_string(ndo, &bp->bp_ciaddr)));
 335
 336         /* 'your' ip address (bootp client) */
 337         ND_TCHECK(bp->bp_yiaddr);
 338         if (EXTRACT_32BITS(&bp->bp_yiaddr.s_addr))
 339                 ND_PRINT((ndo, "\n\t  Your-IP %s", ipaddr_string(ndo, &bp->bp_yiaddr)));
 340
 341         /* Server's ip address */
 342         ND_TCHECK(bp->bp_siaddr);
 343         if (EXTRACT_32BITS(&bp->bp_siaddr.s_addr))
 344                 ND_PRINT((ndo, "\n\t  Server-IP %s", ipaddr_string(ndo, &bp->bp_siaddr)));
 345
 346         /* Gateway's ip address */
 347         ND_TCHECK(bp->bp_giaddr);
 348         if (EXTRACT_32BITS(&bp->bp_giaddr.s_addr))
 349                 ND_PRINT((ndo, "\n\t  Gateway-IP %s", ipaddr_string(ndo, &bp->bp_giaddr)));
 350
 351         /* Client's Ethernet address */
 352         if (bp->bp_htype == 1 && bp->bp_hlen == 6) {
 353                 ND_TCHECK2(bp->bp_chaddr[0], 6);
 354                 ND_PRINT((ndo, "\n\t  Client-Ethernet-Address %s", etheraddr_string(ndo, bp->bp_chaddr)));
 355         }
 356
 357         ND_TCHECK2(bp->bp_sname[0], 1);         /* check first char only */
 358         if (*bp->bp_sname) {
 359                 ND_PRINT((ndo, "\n\t  sname \""));
 360                 if (fn_printztn(ndo, bp->bp_sname, (u_int)sizeof bp->bp_sname,
 361                     ndo->ndo_snapend)) {
 362                         ND_PRINT((ndo, "\""));
 363                         ND_PRINT((ndo, "%s", tstr + 1));
 364                         return;
 365                 }
 366                 ND_PRINT((ndo, "\""));
 367         }
 368         ND_TCHECK2(bp->bp_file[0], 1);          /* check first char only */
 369         if (*bp->bp_file) {
 370                 ND_PRINT((ndo, "\n\t  file \""));
 371                 if (fn_printztn(ndo, bp->bp_file, (u_int)sizeof bp->bp_file,
 372                     ndo->ndo_snapend)) {
 373                         ND_PRINT((ndo, "\""));
 374                         ND_PRINT((ndo, "%s", tstr + 1));
 375                         return;
 376                 }
 377                 ND_PRINT((ndo, "\""));
 378         }
 379
 380         /* Decode the vendor buffer */
 381         ND_TCHECK(bp->bp_vend[0]);
 382         if (memcmp((const char *)bp->bp_vend, vm_rfc1048,
 383                     sizeof(uint32_t)) == 0)
 384                 rfc1048_print(ndo, bp->bp_vend);
 385         else if (memcmp((const char *)bp->bp_vend, vm_cmu,
 386                         sizeof(uint32_t)) == 0)
 387                 cmu_print(ndo, bp->bp_vend);
 388         else {
 389                 uint32_t ul;
 390
 391                 ul = EXTRACT_32BITS(&bp->bp_vend);
 392                 if (ul != 0)
 393                         ND_PRINT((ndo, "\n\t  Vendor-#0x%x", ul));
 394         }
 395
 396         return;
 397 trunc:
 398         ND_PRINT((ndo, "%s", tstr));
 399 }
 400
 401 /*
 402  * The first character specifies the format to print:
 403  *     i - ip address (32 bits)
 404  *     p - ip address pairs (32 bits + 32 bits)
 405  *     l - long (32 bits)
 406  *     L - unsigned long (32 bits)
 407  *     s - short (16 bits)
 408  *     b - period-seperated decimal bytes (variable length)
 409  *     x - colon-seperated hex bytes (variable length)
 410  *     a - ascii string (variable length)
 411  *     B - on/off (8 bits)
 412  *     $ - special (explicit code to handle)
 413  */
 414 static const struct tok tag2str[] = {
 415 /* RFC1048 tags */
 416         { TAG_PAD,              " PAD" },
 417         { TAG_SUBNET_MASK,      "iSubnet-Mask" },       /* subnet mask (RFC950) */
 418         { TAG_TIME_OFFSET,      "LTime-Zone" }, /* seconds from UTC */
 419         { TAG_GATEWAY,          "iDefault-Gateway" },   /* default gateway */
 420         { TAG_TIME_SERVER,      "iTime-Server" },       /* time servers (RFC868) */
 421         { TAG_NAME_SERVER,      "iIEN-Name-Server" },   /* IEN name servers (IEN116) */
 422         { TAG_DOMAIN_SERVER,    "iDomain-Name-Server" },        /* domain name (RFC1035) */
 423         { TAG_LOG_SERVER,       "iLOG" },       /* MIT log servers */
 424         { TAG_COOKIE_SERVER,    "iCS" },        /* cookie servers (RFC865) */
 425         { TAG_LPR_SERVER,       "iLPR-Server" },        /* lpr server (RFC1179) */
 426         { TAG_IMPRESS_SERVER,   "iIM" },        /* impress servers (Imagen) */
 427         { TAG_RLP_SERVER,       "iRL" },        /* resource location (RFC887) */
 428         { TAG_HOSTNAME,         "aHostname" },  /* ascii hostname */
 429         { TAG_BOOTSIZE,         "sBS" },        /* 512 byte blocks */
 430         { TAG_END,              " END" },
 431 /* RFC1497 tags */
 432         { TAG_DUMPPATH,         "aDP" },
 433         { TAG_DOMAINNAME,       "aDomain-Name" },
 434         { TAG_SWAP_SERVER,      "iSS" },
 435         { TAG_ROOTPATH,         "aRP" },
 436         { TAG_EXTPATH,          "aEP" },
 437 /* RFC2132 tags */
 438         { TAG_IP_FORWARD,       "BIPF" },
 439         { TAG_NL_SRCRT,         "BSRT" },
 440         { TAG_PFILTERS,         "pPF" },
 441         { TAG_REASS_SIZE,       "sRSZ" },
 442         { TAG_DEF_TTL,          "bTTL" },
 443         { TAG_MTU_TIMEOUT,      "lMTU-Timeout" },
 444         { TAG_MTU_TABLE,        "sMTU-Table" },
 445         { TAG_INT_MTU,          "sMTU" },
 446         { TAG_LOCAL_SUBNETS,    "BLSN" },
 447         { TAG_BROAD_ADDR,       "iBR" },
 448         { TAG_DO_MASK_DISC,     "BMD" },
 449         { TAG_SUPPLY_MASK,      "BMS" },
 450         { TAG_DO_RDISC,         "BRouter-Discovery" },
 451         { TAG_RTR_SOL_ADDR,     "iRSA" },
 452         { TAG_STATIC_ROUTE,     "pStatic-Route" },
 453         { TAG_USE_TRAILERS,     "BUT" },
 454         { TAG_ARP_TIMEOUT,      "lAT" },
 455         { TAG_ETH_ENCAP,        "BIE" },
 456         { TAG_TCP_TTL,          "bTT" },
 457         { TAG_TCP_KEEPALIVE,    "lKI" },
 458         { TAG_KEEPALIVE_GO,     "BKG" },
 459         { TAG_NIS_DOMAIN,       "aYD" },
 460         { TAG_NIS_SERVERS,      "iYS" },
 461         { TAG_NTP_SERVERS,      "iNTP" },
 462         { TAG_VENDOR_OPTS,      "bVendor-Option" },
 463         { TAG_NETBIOS_NS,       "iNetbios-Name-Server" },
 464         { TAG_NETBIOS_DDS,      "iWDD" },
 465         { TAG_NETBIOS_NODE,     "$Netbios-Node" },
 466         { TAG_NETBIOS_SCOPE,    "aNetbios-Scope" },
 467         { TAG_XWIN_FS,          "iXFS" },
 468         { TAG_XWIN_DM,          "iXDM" },
 469         { TAG_NIS_P_DOMAIN,     "sN+D" },
 470         { TAG_NIS_P_SERVERS,    "iN+S" },
 471         { TAG_MOBILE_HOME,      "iMH" },
 472         { TAG_SMPT_SERVER,      "iSMTP" },
 473         { TAG_POP3_SERVER,      "iPOP3" },
 474         { TAG_NNTP_SERVER,      "iNNTP" },
 475         { TAG_WWW_SERVER,       "iWWW" },
 476         { TAG_FINGER_SERVER,    "iFG" },
 477         { TAG_IRC_SERVER,       "iIRC" },
 478         { TAG_STREETTALK_SRVR,  "iSTS" },
 479         { TAG_STREETTALK_STDA,  "iSTDA" },
 480         { TAG_REQUESTED_IP,     "iRequested-IP" },
 481         { TAG_IP_LEASE,         "lLease-Time" },
 482         { TAG_OPT_OVERLOAD,     "$OO" },
 483         { TAG_TFTP_SERVER,      "aTFTP" },
 484         { TAG_BOOTFILENAME,     "aBF" },
 485         { TAG_DHCP_MESSAGE,     " DHCP-Message" },
 486         { TAG_SERVER_ID,        "iServer-ID" },
 487         { TAG_PARM_REQUEST,     "bParameter-Request" },
 488         { TAG_MESSAGE,          "aMSG" },
 489         { TAG_MAX_MSG_SIZE,     "sMSZ" },
 490         { TAG_RENEWAL_TIME,     "lRN" },
 491         { TAG_REBIND_TIME,      "lRB" },
 492         { TAG_VENDOR_CLASS,     "aVendor-Class" },
 493         { TAG_CLIENT_ID,        "$Client-ID" },
 494 /* RFC 2485 */
 495         { TAG_OPEN_GROUP_UAP,   "aUAP" },
 496 /* RFC 2563 */
 497         { TAG_DISABLE_AUTOCONF, "BNOAUTO" },
 498 /* RFC 2610 */
 499         { TAG_SLP_DA,           "bSLP-DA" },    /*"b" is a little wrong */
 500         { TAG_SLP_SCOPE,        "bSLP-SCOPE" }, /*"b" is a little wrong */
 501 /* RFC 2937 */
 502         { TAG_NS_SEARCH,        "sNSSEARCH" },  /* XXX 's' */
 503 /* RFC 3004 - The User Class Option for DHCP */
 504         { TAG_USER_CLASS,       "$User-Class" },
 505 /* RFC 3011 */
 506         { TAG_IP4_SUBNET_SELECT, "iSUBNET" },
 507 /* RFC 3442 */
 508         { TAG_CLASSLESS_STATIC_RT, "$Classless-Static-Route" },
 509         { TAG_CLASSLESS_STA_RT_MS, "$Classless-Static-Route-Microsoft" },
 510 /* RFC 5859 - TFTP Server Address Option for DHCPv4 */
 511         { TAG_TFTP_SERVER_ADDRESS, "iTFTP-Server-Address" },
 512 /* http://www.iana.org/assignments/bootp-dhcp-extensions/index.htm */
 513         { TAG_SLP_NAMING_AUTH,  "aSLP-NA" },
 514         { TAG_CLIENT_FQDN,      "$FQDN" },
 515         { TAG_AGENT_CIRCUIT,    "$Agent-Information" },
 516         { TAG_AGENT_REMOTE,     "bARMT" },
 517         { TAG_AGENT_MASK,       "bAMSK" },
 518         { TAG_TZ_STRING,        "aTZSTR" },
 519         { TAG_FQDN_OPTION,      "bFQDNS" },     /* XXX 'b' */
 520         { TAG_AUTH,             "bAUTH" },      /* XXX 'b' */
 521         { TAG_VINES_SERVERS,    "iVINES" },
 522         { TAG_SERVER_RANK,      "sRANK" },
 523         { TAG_CLIENT_ARCH,      "sARCH" },
 524         { TAG_CLIENT_NDI,       "bNDI" },       /* XXX 'b' */
 525         { TAG_CLIENT_GUID,      "bGUID" },      /* XXX 'b' */
 526         { TAG_LDAP_URL,         "aLDAP" },
 527         { TAG_6OVER4,           "i6o4" },
 528         { TAG_TZ_PCODE,         "aPOSIX-TZ" },
 529         { TAG_TZ_TCODE,         "aTZ-Name" },
 530         { TAG_IPX_COMPAT,       "bIPX" },       /* XXX 'b' */
 531         { TAG_NETINFO_PARENT,   "iNI" },
 532         { TAG_NETINFO_PARENT_TAG, "aNITAG" },
 533         { TAG_URL,              "aURL" },
 534         { TAG_FAILOVER,         "bFAIL" },      /* XXX 'b' */
 535         { TAG_MUDURL,           "aMUD-URL" },
 536         { 0, NULL }
 537 };
 538 /* 2-byte extended tags */
 539 static const struct tok xtag2str[] = {
 540         { 0, NULL }
 541 };
 542
 543 /* DHCP "options overload" types */
 544 static const struct tok oo2str[] = {
 545         { 1,    "file" },
 546         { 2,    "sname" },
 547         { 3,    "file+sname" },
 548         { 0, NULL }
 549 };
 550
 551 /* NETBIOS over TCP/IP node type options */
 552 static const struct tok nbo2str[] = {
 553         { 0x1,  "b-node" },
 554         { 0x2,  "p-node" },
 555         { 0x4,  "m-node" },
 556         { 0x8,  "h-node" },
 557         { 0, NULL }
 558 };
 559
 560 /* ARP Hardware types, for Client-ID option */
 561 static const struct tok arp2str[] = {
 562         { 0x1,  "ether" },
 563         { 0x6,  "ieee802" },
 564         { 0x7,  "arcnet" },
 565         { 0xf,  "frelay" },
 566         { 0x17, "strip" },
 567         { 0x18, "ieee1394" },
 568         { 0, NULL }
 569 };
 570
 571 static const struct tok dhcp_msg_values[] = {
 572         { DHCPDISCOVER, "Discover" },
 573         { DHCPOFFER,    "Offer" },
 574         { DHCPREQUEST,  "Request" },
 575         { DHCPDECLINE,  "Decline" },
 576         { DHCPACK,      "ACK" },
 577         { DHCPNAK,      "NACK" },
 578         { DHCPRELEASE,  "Release" },
 579         { DHCPINFORM,   "Inform" },
 580         { 0, NULL }
 581 };
 582
 583 #define AGENT_SUBOPTION_CIRCUIT_ID      1       /* RFC 3046 */
 584 #define AGENT_SUBOPTION_REMOTE_ID       2       /* RFC 3046 */
 585 #define AGENT_SUBOPTION_SUBSCRIBER_ID   6       /* RFC 3993 */
 586 static const struct tok agent_suboption_values[] = {
 587         { AGENT_SUBOPTION_CIRCUIT_ID,    "Circuit-ID" },
 588         { AGENT_SUBOPTION_REMOTE_ID,     "Remote-ID" },
 589         { AGENT_SUBOPTION_SUBSCRIBER_ID, "Subscriber-ID" },
 590         { 0, NULL }
 591 };
 592
 593
 594 static void
 595 rfc1048_print(netdissect_options *ndo,
 596               register const u_char *bp)
 597 {
 598         register uint16_t tag;
 599         register u_int len;
 600         register const char *cp;
 601         register char c;
 602         int first, idx;
 603         uint32_t ul;
 604         uint16_t us;
 605         uint8_t uc, subopt, suboptlen;
 606
 607         ND_PRINT((ndo, "\n\t  Vendor-rfc1048 Extensions"));
 608
 609         /* Step over magic cookie */
 610         ND_PRINT((ndo, "\n\t    Magic Cookie 0x%08x", EXTRACT_32BITS(bp)));
 611         bp += sizeof(int32_t);
 612
 613         /* Loop while we there is a tag left in the buffer */
 614         while (ND_TTEST2(*bp, 1)) {
 615                 tag = *bp++;
 616                 if (tag == TAG_PAD && ndo->ndo_vflag < 3)
 617                         continue;
 618                 if (tag == TAG_END && ndo->ndo_vflag < 3)
 619                         return;
 620                 if (tag == TAG_EXTENDED_OPTION) {
 621                         ND_TCHECK2(*(bp + 1), 2);
 622                         tag = EXTRACT_16BITS(bp + 1);
 623                         /* XXX we don't know yet if the IANA will
 624                          * preclude overlap of 1-byte and 2-byte spaces.
 625                          * If not, we need to offset tag after this step.
 626                          */
 627                         cp = tok2str(xtag2str, "?xT%u", tag);
 628                 } else
 629                         cp = tok2str(tag2str, "?T%u", tag);
 630                 c = *cp++;
 631
 632                 if (tag == TAG_PAD || tag == TAG_END)
 633                         len = 0;
 634                 else {
 635                         /* Get the length; check for truncation */
 636                         ND_TCHECK2(*bp, 1);
 637                         len = *bp++;
 638                 }
 639
 640                 ND_PRINT((ndo, "\n\t    %s Option %u, length %u%s", cp, tag, len,
 641                           len > 0 ? ": " : ""));
 642
 643                 if (tag == TAG_PAD && ndo->ndo_vflag > 2) {
 644                         u_int ntag = 1;
 645                         while (ND_TTEST2(*bp, 1) && *bp == TAG_PAD) {
 646                                 bp++;
 647                                 ntag++;
 648                         }
 649                         if (ntag > 1)
 650                                 ND_PRINT((ndo, ", occurs %u", ntag));
 651                 }
 652
 653                 if (!ND_TTEST2(*bp, len)) {
 654                         ND_PRINT((ndo, "[|rfc1048 %u]", len));
 655                         return;
 656                 }
 657
 658                 if (tag == TAG_DHCP_MESSAGE && len == 1) {
 659                         uc = *bp++;
 660                         ND_PRINT((ndo, "%s", tok2str(dhcp_msg_values, "Unknown (%u)", uc)));
 661                         continue;
 662                 }
 663
 664                 if (tag == TAG_PARM_REQUEST) {
 665                         idx = 0;
 666                         while (len-- > 0) {
 667                                 uc = *bp++;
 668                                 cp = tok2str(tag2str, "?Option %u", uc);
 669                                 if (idx % 4 == 0)
 670                                         ND_PRINT((ndo, "\n\t      "));
 671                                 else
 672                                         ND_PRINT((ndo, ", "));
 673                                 ND_PRINT((ndo, "%s", cp + 1));
 674                                 idx++;
 675                         }
 676                         continue;
 677                 }
 678
 679                 if (tag == TAG_EXTENDED_REQUEST) {
 680                         first = 1;
 681                         while (len > 1) {
 682                                 len -= 2;
 683                                 us = EXTRACT_16BITS(bp);
 684                                 bp += 2;
 685                                 cp = tok2str(xtag2str, "?xT%u", us);
 686                                 if (!first)
 687                                         ND_PRINT((ndo, "+"));
 688                                 ND_PRINT((ndo, "%s", cp + 1));
 689                                 first = 0;
 690                         }
 691                         continue;
 692                 }
 693
 694                 /* Print data */
 695                 if (c == '?') {
 696                         /* Base default formats for unknown tags on data size */
 697                         if (len & 1)
 698                                 c = 'b';
 699                         else if (len & 2)
 700                                 c = 's';
 701                         else
 702                                 c = 'l';
 703                 }
 704                 first = 1;
 705                 switch (c) {
 706
 707                 case 'a':
 708                         /* ascii strings */
 709                         ND_PRINT((ndo, "\""));
 710                         if (fn_printn(ndo, bp, len, ndo->ndo_snapend)) {
 711                                 ND_PRINT((ndo, "\""));
 712                                 goto trunc;
 713                         }
 714                         ND_PRINT((ndo, "\""));
 715                         bp += len;
 716                         len = 0;
 717                         break;
 718
 719                 case 'i':
 720                 case 'l':
 721                 case 'L':
 722                         /* ip addresses/32-bit words */
 723                         while (len >= sizeof(ul)) {
 724                                 if (!first)
 725                                         ND_PRINT((ndo, ","));
 726                                 ul = EXTRACT_32BITS(bp);
 727                                 if (c == 'i') {
 728                                         ul = htonl(ul);
 729                                         ND_PRINT((ndo, "%s", ipaddr_string(ndo, &ul)));
 730                                 } else if (c == 'L')
 731                                         ND_PRINT((ndo, "%d", ul));
 732                                 else
 733                                         ND_PRINT((ndo, "%u", ul));
 734                                 bp += sizeof(ul);
 735                                 len -= sizeof(ul);
 736                                 first = 0;
 737                         }
 738                         break;
 739
 740                 case 'p':
 741                         /* IP address pairs */
 742                         while (len >= 2*sizeof(ul)) {
 743                                 if (!first)
 744                                         ND_PRINT((ndo, ","));
 745                                 memcpy((char *)&ul, (const char *)bp, sizeof(ul));
 746                                 ND_PRINT((ndo, "(%s:", ipaddr_string(ndo, &ul)));
 747                                 bp += sizeof(ul);
 748                                 memcpy((char *)&ul, (const char *)bp, sizeof(ul));
 749                                 ND_PRINT((ndo, "%s)", ipaddr_string(ndo, &ul)));
 750                                 bp += sizeof(ul);
 751                                 len -= 2*sizeof(ul);
 752                                 first = 0;
 753                         }
 754                         break;
 755
 756                 case 's':
 757                         /* shorts */
 758                         while (len >= sizeof(us)) {
 759                                 if (!first)
 760                                         ND_PRINT((ndo, ","));
 761                                 us = EXTRACT_16BITS(bp);
 762                                 ND_PRINT((ndo, "%u", us));
 763                                 bp += sizeof(us);
 764                                 len -= sizeof(us);
 765                                 first = 0;
 766                         }
 767                         break;
 768
 769                 case 'B':
 770                         /* boolean */
 771                         while (len > 0) {
 772                                 if (!first)
 773                                         ND_PRINT((ndo, ","));
 774                                 switch (*bp) {
 775                                 case 0:
 776                                         ND_PRINT((ndo, "N"));
 777                                         break;
 778                                 case 1:
 779                                         ND_PRINT((ndo, "Y"));
 780                                         break;
 781                                 default:
 782                                         ND_PRINT((ndo, "%u?", *bp));
 783                                         break;
 784                                 }
 785                                 ++bp;
 786                                 --len;
 787                                 first = 0;
 788                         }
 789                         break;
 790
 791                 case 'b':
 792                 case 'x':
 793                 default:
 794                         /* Bytes */
 795                         while (len > 0) {
 796                                 if (!first)
 797                                         ND_PRINT((ndo, c == 'x' ? ":" : "."));
 798                                 if (c == 'x')
 799                                         ND_PRINT((ndo, "%02x", *bp));
 800                                 else
 801                                         ND_PRINT((ndo, "%u", *bp));
 802                                 ++bp;
 803                                 --len;
 804                                 first = 0;
 805                         }
 806                         break;
 807
 808                 case '$':
 809                         /* Guys we can't handle with one of the usual cases */
 810                         switch (tag) {
 811
 812                         case TAG_NETBIOS_NODE:
 813                                 /* this option should be at least 1 byte long */
 814                                 if (len < 1) {
 815                                         ND_PRINT((ndo, "ERROR: length < 1 bytes"));
 816                                         break;
 817                                 }
 818                                 tag = *bp++;
 819                                 --len;
 820                                 ND_PRINT((ndo, "%s", tok2str(nbo2str, NULL, tag)));
 821                                 break;
 822
 823                         case TAG_OPT_OVERLOAD:
 824                                 /* this option should be at least 1 byte long */
 825                                 if (len < 1) {
 826                                         ND_PRINT((ndo, "ERROR: length < 1 bytes"));
 827                                         break;
 828                                 }
 829                                 tag = *bp++;
 830                                 --len;
 831                                 ND_PRINT((ndo, "%s", tok2str(oo2str, NULL, tag)));
 832                                 break;
 833
 834                         case TAG_CLIENT_FQDN:
 835                                 /* this option should be at least 3 bytes long */
 836                                 if (len < 3) {
 837                                         ND_PRINT((ndo, "ERROR: length < 3 bytes"));
 838                                         bp += len;
 839                                         len = 0;
 840                                         break;
 841                                 }
 842                                 if (*bp)
 843                                         ND_PRINT((ndo, "[%s] ", client_fqdn_flags(*bp)));
 844                                 bp++;
 845                                 if (*bp || *(bp+1))
 846                                         ND_PRINT((ndo, "%u/%u ", *bp, *(bp+1)));
 847                                 bp += 2;
 848                                 ND_PRINT((ndo, "\""));
 849                                 if (fn_printn(ndo, bp, len - 3, ndo->ndo_snapend)) {
 850                                         ND_PRINT((ndo, "\""));
 851                                         goto trunc;
 852                                 }
 853                                 ND_PRINT((ndo, "\""));
 854                                 bp += len - 3;
 855                                 len = 0;
 856                                 break;
 857
 858                         case TAG_CLIENT_ID:
 859                             {
 860                                 int type;
 861
 862                                 /* this option should be at least 1 byte long */
 863                                 if (len < 1) {
 864                                         ND_PRINT((ndo, "ERROR: length < 1 bytes"));
 865                                         break;
 866                                 }
 867                                 type = *bp++;
 868                                 len--;
 869                                 if (type == 0) {
 870                                         ND_PRINT((ndo, "\""));
 871                                         if (fn_printn(ndo, bp, len, ndo->ndo_snapend)) {
 872                                                 ND_PRINT((ndo, "\""));
 873                                                 goto trunc;
 874                                         }
 875                                         ND_PRINT((ndo, "\""));
 876                                         bp += len;
 877                                         len = 0;
 878                                         break;
 879                                 } else {
 880                                         ND_PRINT((ndo, "%s ", tok2str(arp2str, "hardware-type %u,", type)));
 881                                         while (len > 0) {
 882                                                 if (!first)
 883                                                         ND_PRINT((ndo, ":"));
 884                                                 ND_PRINT((ndo, "%02x", *bp));
 885                                                 ++bp;
 886                                                 --len;
 887                                                 first = 0;
 888                                         }
 889                                 }
 890                                 break;
 891                             }
 892
 893                         case TAG_AGENT_CIRCUIT:
 894                                 while (len >= 2) {
 895                                         subopt = *bp++;
 896                                         suboptlen = *bp++;
 897                                         len -= 2;
 898                                         if (suboptlen > len) {
 899                                                 ND_PRINT((ndo, "\n\t      %s SubOption %u, length %u: length goes past end of option",
 900                                                           tok2str(agent_suboption_values, "Unknown", subopt),
 901                                                           subopt,
 902                                                           suboptlen));
 903                                                 bp += len;
 904                                                 len = 0;
 905                                                 break;
 906                                         }
 907                                         ND_PRINT((ndo, "\n\t      %s SubOption %u, length %u: ",
 908                                                   tok2str(agent_suboption_values, "Unknown", subopt),
 909                                                   subopt,
 910                                                   suboptlen));
 911                                         switch (subopt) {
 912
 913                                         case AGENT_SUBOPTION_CIRCUIT_ID: /* fall through */
 914                                         case AGENT_SUBOPTION_REMOTE_ID:
 915                                         case AGENT_SUBOPTION_SUBSCRIBER_ID:
 916                                                 if (fn_printn(ndo, bp, suboptlen, ndo->ndo_snapend))
 917                                                         goto trunc;
 918                                                 break;
 919
 920                                         default:
 921                                                 print_unknown_data(ndo, bp, "\n\t\t", suboptlen);
 922                                         }
 923
 924                                         len -= suboptlen;
 925                                         bp += suboptlen;
 926                                 }
 927                                 break;
 928
 929                         case TAG_CLASSLESS_STATIC_RT:
 930                         case TAG_CLASSLESS_STA_RT_MS:
 931                             {
 932                                 u_int mask_width, significant_octets, i;
 933
 934                                 /* this option should be at least 5 bytes long */
 935                                 if (len < 5) {
 936                                         ND_PRINT((ndo, "ERROR: length < 5 bytes"));
 937                                         bp += len;
 938                                         len = 0;
 939                                         break;
 940                                 }
 941                                 while (len > 0) {
 942                                         if (!first)
 943                                                 ND_PRINT((ndo, ","));
 944                                         mask_width = *bp++;
 945                                         len--;
 946                                         /* mask_width <= 32 */
 947                                         if (mask_width > 32) {
 948                                                 ND_PRINT((ndo, "[ERROR: Mask width (%d) > 32]", mask_width));
 949                                                 bp += len;
 950                                                 len = 0;
 951                                                 break;
 952                                         }
 953                                         significant_octets = (mask_width + 7) / 8;
 954                                         /* significant octets + router(4) */
 955                                         if (len < significant_octets + 4) {
 956                                                 ND_PRINT((ndo, "[ERROR: Remaining length (%u) < %u bytes]", len, significant_octets + 4));
 957                                                 bp += len;
 958                                                 len = 0;
 959                                                 break;
 960                                         }
 961                                         ND_PRINT((ndo, "("));
 962                                         if (mask_width == 0)
 963                                                 ND_PRINT((ndo, "default"));
 964                                         else {
 965                                                 for (i = 0; i < significant_octets ; i++) {
 966                                                         if (i > 0)
 967                                                                 ND_PRINT((ndo, "."));
 968                                                         ND_PRINT((ndo, "%d", *bp++));
 969                                                 }
 970                                                 for (i = significant_octets ; i < 4 ; i++)
 971                                                         ND_PRINT((ndo, ".0"));
 972                                                 ND_PRINT((ndo, "/%d", mask_width));
 973                                         }
 974                                         memcpy((char *)&ul, (const char *)bp, sizeof(ul));
 975                                         ND_PRINT((ndo, ":%s)", ipaddr_string(ndo, &ul)));
 976                                         bp += sizeof(ul);
 977                                         len -= (significant_octets + 4);
 978                                         first = 0;
 979                                 }
 980                                 break;
 981                             }
 982
 983                         case TAG_USER_CLASS:
 984                             {
 985                                 u_int suboptnumber = 1;
 986
 987                                 first = 1;
 988                                 if (len < 2) {
 989                                         ND_PRINT((ndo, "ERROR: length < 2 bytes"));
 990                                         bp += len;
 991                                         len = 0;
 992                                         break;
 993                                 }
 994                                 while (len > 0) {
 995                                         suboptlen = *bp++;
 996                                         len--;
 997                                         ND_PRINT((ndo, "\n\t      "));
 998                                         ND_PRINT((ndo, "instance#%u: ", suboptnumber));
 999                                         if (suboptlen == 0) {
1000                                                 ND_PRINT((ndo, "ERROR: suboption length must be non-zero"));
1001                                                 bp += len;
1002                                                 len = 0;
1003                                                 break;
1004                                         }
1005                                         if (len < suboptlen) {
1006                                                 ND_PRINT((ndo, "ERROR: invalid option"));
1007                                                 bp += len;
1008                                                 len = 0;
1009                                                 break;
1010                                         }
1011                                         ND_PRINT((ndo, "\""));
1012                                         if (fn_printn(ndo, bp, suboptlen, ndo->ndo_snapend)) {
1013                                                 ND_PRINT((ndo, "\""));
1014                                                 goto trunc;
1015                                         }
1016                                         ND_PRINT((ndo, "\""));
1017                                         ND_PRINT((ndo, ", length %d", suboptlen));
1018                                         suboptnumber++;
1019                                         len -= suboptlen;
1020                                         bp += suboptlen;
1021                                 }
1022                                 break;
1023                             }
1024
1025                         default:
1026                                 ND_PRINT((ndo, "[unknown special tag %u, size %u]",
1027                                           tag, len));
1028                                 bp += len;
1029                                 len = 0;
1030                                 break;
1031                         }
1032                         break;
1033                 }
1034                 /* Data left over? */
1035                 if (len) {
1036                         ND_PRINT((ndo, "\n\t  trailing data length %u", len));
1037                         bp += len;
1038                 }
1039         }
1040         return;
1041 trunc:
1042         ND_PRINT((ndo, "|[rfc1048]"));
1043 }
1044
1045 static void
1046 cmu_print(netdissect_options *ndo,
1047           register const u_char *bp)
1048 {
1049         register const struct cmu_vend *cmu;
1050
1051 #define PRINTCMUADDR(m, s) { ND_TCHECK(cmu->m); \
1052     if (cmu->m.s_addr != 0) \
1053         ND_PRINT((ndo, " %s:%s", s, ipaddr_string(ndo, &cmu->m.s_addr))); }
1054
1055         ND_PRINT((ndo, " vend-cmu"));
1056         cmu = (const struct cmu_vend *)bp;
1057
1058         /* Only print if there are unknown bits */
1059         ND_TCHECK(cmu->v_flags);
1060         if ((cmu->v_flags & ~(VF_SMASK)) != 0)
1061                 ND_PRINT((ndo, " F:0x%x", cmu->v_flags));
1062         PRINTCMUADDR(v_dgate, "DG");
1063         PRINTCMUADDR(v_smask, cmu->v_flags & VF_SMASK ? "SM" : "SM*");
1064         PRINTCMUADDR(v_dns1, "NS1");
1065         PRINTCMUADDR(v_dns2, "NS2");
1066         PRINTCMUADDR(v_ins1, "IEN1");
1067         PRINTCMUADDR(v_ins2, "IEN2");
1068         PRINTCMUADDR(v_ts1, "TS1");
1069         PRINTCMUADDR(v_ts2, "TS2");
1070         return;
1071
1072 trunc:
1073         ND_PRINT((ndo, "%s", tstr));
1074 #undef PRINTCMUADDR
1075 }
1076
1077 static char *
1078 client_fqdn_flags(u_int flags)
1079 {
1080         static char buf[8+1];
1081         int i = 0;
1082
1083         if (flags & CLIENT_FQDN_FLAGS_S)
1084                 buf[i++] = 'S';
1085         if (flags & CLIENT_FQDN_FLAGS_O)
1086                 buf[i++] = 'O';
1087         if (flags & CLIENT_FQDN_FLAGS_E)
1088                 buf[i++] = 'E';
1089         if (flags & CLIENT_FQDN_FLAGS_N)
1090                 buf[i++] = 'N';
1091         buf[i] = '\0';
1092
1093         return buf;
1094 }