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) == 0) {
 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) == 0) {
 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_TCHECK2(bp->bp_vend[0], 4);
 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                 ND_TCHECK_32BITS(&bp->bp_vend);
 392                 ul = EXTRACT_32BITS(&bp->bp_vend);
 393                 if (ul != 0)
 394                         ND_PRINT((ndo, "\n\t  Vendor-#0x%x", ul));
 395         }
 396
 397         return;
 398 trunc:
 399         ND_PRINT((ndo, "%s", tstr));
 400 }
 401
 402 /*
 403  * The first character specifies the format to print:
 404  *     i - ip address (32 bits)
 405  *     p - ip address pairs (32 bits + 32 bits)
 406  *     l - long (32 bits)
 407  *     L - unsigned long (32 bits)
 408  *     s - short (16 bits)
 409  *     b - period-seperated decimal bytes (variable length)
 410  *     x - colon-seperated hex bytes (variable length)
 411  *     a - ascii string (variable length)
 412  *     B - on/off (8 bits)
 413  *     $ - special (explicit code to handle)
 414  */
 415 static const struct tok tag2str[] = {
 416 /* RFC1048 tags */
 417         { TAG_PAD,              " PAD" },
 418         { TAG_SUBNET_MASK,      "iSubnet-Mask" },       /* subnet mask (RFC950) */
 419         { TAG_TIME_OFFSET,      "LTime-Zone" }, /* seconds from UTC */
 420         { TAG_GATEWAY,          "iDefault-Gateway" },   /* default gateway */
 421         { TAG_TIME_SERVER,      "iTime-Server" },       /* time servers (RFC868) */
 422         { TAG_NAME_SERVER,      "iIEN-Name-Server" },   /* IEN name servers (IEN116) */
 423         { TAG_DOMAIN_SERVER,    "iDomain-Name-Server" },        /* domain name (RFC1035) */
 424         { TAG_LOG_SERVER,       "iLOG" },       /* MIT log servers */
 425         { TAG_COOKIE_SERVER,    "iCS" },        /* cookie servers (RFC865) */
 426         { TAG_LPR_SERVER,       "iLPR-Server" },        /* lpr server (RFC1179) */
 427         { TAG_IMPRESS_SERVER,   "iIM" },        /* impress servers (Imagen) */
 428         { TAG_RLP_SERVER,       "iRL" },        /* resource location (RFC887) */
 429         { TAG_HOSTNAME,         "aHostname" },  /* ascii hostname */
 430         { TAG_BOOTSIZE,         "sBS" },        /* 512 byte blocks */
 431         { TAG_END,              " END" },
 432 /* RFC1497 tags */
 433         { TAG_DUMPPATH,         "aDP" },
 434         { TAG_DOMAINNAME,       "aDomain-Name" },
 435         { TAG_SWAP_SERVER,      "iSS" },
 436         { TAG_ROOTPATH,         "aRP" },
 437         { TAG_EXTPATH,          "aEP" },
 438 /* RFC2132 tags */
 439         { TAG_IP_FORWARD,       "BIPF" },
 440         { TAG_NL_SRCRT,         "BSRT" },
 441         { TAG_PFILTERS,         "pPF" },
 442         { TAG_REASS_SIZE,       "sRSZ" },
 443         { TAG_DEF_TTL,          "bTTL" },
 444         { TAG_MTU_TIMEOUT,      "lMTU-Timeout" },
 445         { TAG_MTU_TABLE,        "sMTU-Table" },
 446         { TAG_INT_MTU,          "sMTU" },
 447         { TAG_LOCAL_SUBNETS,    "BLSN" },
 448         { TAG_BROAD_ADDR,       "iBR" },
 449         { TAG_DO_MASK_DISC,     "BMD" },
 450         { TAG_SUPPLY_MASK,      "BMS" },
 451         { TAG_DO_RDISC,         "BRouter-Discovery" },
 452         { TAG_RTR_SOL_ADDR,     "iRSA" },
 453         { TAG_STATIC_ROUTE,     "pStatic-Route" },
 454         { TAG_USE_TRAILERS,     "BUT" },
 455         { TAG_ARP_TIMEOUT,      "lAT" },
 456         { TAG_ETH_ENCAP,        "BIE" },
 457         { TAG_TCP_TTL,          "bTT" },
 458         { TAG_TCP_KEEPALIVE,    "lKI" },
 459         { TAG_KEEPALIVE_GO,     "BKG" },
 460         { TAG_NIS_DOMAIN,       "aYD" },
 461         { TAG_NIS_SERVERS,      "iYS" },
 462         { TAG_NTP_SERVERS,      "iNTP" },
 463         { TAG_VENDOR_OPTS,      "bVendor-Option" },
 464         { TAG_NETBIOS_NS,       "iNetbios-Name-Server" },
 465         { TAG_NETBIOS_DDS,      "iWDD" },
 466         { TAG_NETBIOS_NODE,     "$Netbios-Node" },
 467         { TAG_NETBIOS_SCOPE,    "aNetbios-Scope" },
 468         { TAG_XWIN_FS,          "iXFS" },
 469         { TAG_XWIN_DM,          "iXDM" },
 470         { TAG_NIS_P_DOMAIN,     "sN+D" },
 471         { TAG_NIS_P_SERVERS,    "iN+S" },
 472         { TAG_MOBILE_HOME,      "iMH" },
 473         { TAG_SMPT_SERVER,      "iSMTP" },
 474         { TAG_POP3_SERVER,      "iPOP3" },
 475         { TAG_NNTP_SERVER,      "iNNTP" },
 476         { TAG_WWW_SERVER,       "iWWW" },
 477         { TAG_FINGER_SERVER,    "iFG" },
 478         { TAG_IRC_SERVER,       "iIRC" },
 479         { TAG_STREETTALK_SRVR,  "iSTS" },
 480         { TAG_STREETTALK_STDA,  "iSTDA" },
 481         { TAG_REQUESTED_IP,     "iRequested-IP" },
 482         { TAG_IP_LEASE,         "lLease-Time" },
 483         { TAG_OPT_OVERLOAD,     "$OO" },
 484         { TAG_TFTP_SERVER,      "aTFTP" },
 485         { TAG_BOOTFILENAME,     "aBF" },
 486         { TAG_DHCP_MESSAGE,     " DHCP-Message" },
 487         { TAG_SERVER_ID,        "iServer-ID" },
 488         { TAG_PARM_REQUEST,     "bParameter-Request" },
 489         { TAG_MESSAGE,          "aMSG" },
 490         { TAG_MAX_MSG_SIZE,     "sMSZ" },
 491         { TAG_RENEWAL_TIME,     "lRN" },
 492         { TAG_REBIND_TIME,      "lRB" },
 493         { TAG_VENDOR_CLASS,     "aVendor-Class" },
 494         { TAG_CLIENT_ID,        "$Client-ID" },
 495 /* RFC 2485 */
 496         { TAG_OPEN_GROUP_UAP,   "aUAP" },
 497 /* RFC 2563 */
 498         { TAG_DISABLE_AUTOCONF, "BNOAUTO" },
 499 /* RFC 2610 */
 500         { TAG_SLP_DA,           "bSLP-DA" },    /*"b" is a little wrong */
 501         { TAG_SLP_SCOPE,        "bSLP-SCOPE" }, /*"b" is a little wrong */
 502 /* RFC 2937 */
 503         { TAG_NS_SEARCH,        "sNSSEARCH" },  /* XXX 's' */
 504 /* RFC 3004 - The User Class Option for DHCP */
 505         { TAG_USER_CLASS,       "$User-Class" },
 506 /* RFC 3011 */
 507         { TAG_IP4_SUBNET_SELECT, "iSUBNET" },
 508 /* RFC 3442 */
 509         { TAG_CLASSLESS_STATIC_RT, "$Classless-Static-Route" },
 510         { TAG_CLASSLESS_STA_RT_MS, "$Classless-Static-Route-Microsoft" },
 511 /* RFC 5859 - TFTP Server Address Option for DHCPv4 */
 512         { TAG_TFTP_SERVER_ADDRESS, "iTFTP-Server-Address" },
 513 /* http://www.iana.org/assignments/bootp-dhcp-extensions/index.htm */
 514         { TAG_SLP_NAMING_AUTH,  "aSLP-NA" },
 515         { TAG_CLIENT_FQDN,      "$FQDN" },
 516         { TAG_AGENT_CIRCUIT,    "$Agent-Information" },
 517         { TAG_AGENT_REMOTE,     "bARMT" },
 518         { TAG_AGENT_MASK,       "bAMSK" },
 519         { TAG_TZ_STRING,        "aTZSTR" },
 520         { TAG_FQDN_OPTION,      "bFQDNS" },     /* XXX 'b' */
 521         { TAG_AUTH,             "bAUTH" },      /* XXX 'b' */
 522         { TAG_VINES_SERVERS,    "iVINES" },
 523         { TAG_SERVER_RANK,      "sRANK" },
 524         { TAG_CLIENT_ARCH,      "sARCH" },
 525         { TAG_CLIENT_NDI,       "bNDI" },       /* XXX 'b' */
 526         { TAG_CLIENT_GUID,      "bGUID" },      /* XXX 'b' */
 527         { TAG_LDAP_URL,         "aLDAP" },
 528         { TAG_6OVER4,           "i6o4" },
 529         { TAG_TZ_PCODE,         "aPOSIX-TZ" },
 530         { TAG_TZ_TCODE,         "aTZ-Name" },
 531         { TAG_IPX_COMPAT,       "bIPX" },       /* XXX 'b' */
 532         { TAG_NETINFO_PARENT,   "iNI" },
 533         { TAG_NETINFO_PARENT_TAG, "aNITAG" },
 534         { TAG_URL,              "aURL" },
 535         { TAG_FAILOVER,         "bFAIL" },      /* XXX 'b' */
 536         { TAG_MUDURL,           "aMUD-URL" },
 537         { 0, NULL }
 538 };
 539 /* 2-byte extended tags */
 540 static const struct tok xtag2str[] = {
 541         { 0, NULL }
 542 };
 543
 544 /* DHCP "options overload" types */
 545 static const struct tok oo2str[] = {
 546         { 1,    "file" },
 547         { 2,    "sname" },
 548         { 3,    "file+sname" },
 549         { 0, NULL }
 550 };
 551
 552 /* NETBIOS over TCP/IP node type options */
 553 static const struct tok nbo2str[] = {
 554         { 0x1,  "b-node" },
 555         { 0x2,  "p-node" },
 556         { 0x4,  "m-node" },
 557         { 0x8,  "h-node" },
 558         { 0, NULL }
 559 };
 560
 561 /* ARP Hardware types, for Client-ID option */
 562 static const struct tok arp2str[] = {
 563         { 0x1,  "ether" },
 564         { 0x6,  "ieee802" },
 565         { 0x7,  "arcnet" },
 566         { 0xf,  "frelay" },
 567         { 0x17, "strip" },
 568         { 0x18, "ieee1394" },
 569         { 0, NULL }
 570 };
 571
 572 static const struct tok dhcp_msg_values[] = {
 573         { DHCPDISCOVER, "Discover" },
 574         { DHCPOFFER,    "Offer" },
 575         { DHCPREQUEST,  "Request" },
 576         { DHCPDECLINE,  "Decline" },
 577         { DHCPACK,      "ACK" },
 578         { DHCPNAK,      "NACK" },
 579         { DHCPRELEASE,  "Release" },
 580         { DHCPINFORM,   "Inform" },
 581         { 0, NULL }
 582 };
 583
 584 #define AGENT_SUBOPTION_CIRCUIT_ID      1       /* RFC 3046 */
 585 #define AGENT_SUBOPTION_REMOTE_ID       2       /* RFC 3046 */
 586 #define AGENT_SUBOPTION_SUBSCRIBER_ID   6       /* RFC 3993 */
 587 static const struct tok agent_suboption_values[] = {
 588         { AGENT_SUBOPTION_CIRCUIT_ID,    "Circuit-ID" },
 589         { AGENT_SUBOPTION_REMOTE_ID,     "Remote-ID" },
 590         { AGENT_SUBOPTION_SUBSCRIBER_ID, "Subscriber-ID" },
 591         { 0, NULL }
 592 };
 593
 594
 595 static void
 596 rfc1048_print(netdissect_options *ndo,
 597               register const u_char *bp)
 598 {
 599         register uint16_t tag;
 600         register u_int len;
 601         register const char *cp;
 602         register char c;
 603         int first, idx;
 604         uint32_t ul;
 605         uint16_t us;
 606         uint8_t uc, subopt, suboptlen;
 607
 608         ND_PRINT((ndo, "\n\t  Vendor-rfc1048 Extensions"));
 609
 610         /* Step over magic cookie */
 611         ND_PRINT((ndo, "\n\t    Magic Cookie 0x%08x", EXTRACT_32BITS(bp)));
 612         bp += sizeof(int32_t);
 613
 614         /* Loop while we there is a tag left in the buffer */
 615         while (ND_TTEST2(*bp, 1)) {
 616                 tag = *bp++;
 617                 if (tag == TAG_PAD && ndo->ndo_vflag < 3)
 618                         continue;
 619                 if (tag == TAG_END && ndo->ndo_vflag < 3)
 620                         return;
 621                 if (tag == TAG_EXTENDED_OPTION) {
 622                         ND_TCHECK2(*(bp + 1), 2);
 623                         tag = EXTRACT_16BITS(bp + 1);
 624                         /* XXX we don't know yet if the IANA will
 625                          * preclude overlap of 1-byte and 2-byte spaces.
 626                          * If not, we need to offset tag after this step.
 627                          */
 628                         cp = tok2str(xtag2str, "?xT%u", tag);
 629                 } else
 630                         cp = tok2str(tag2str, "?T%u", tag);
 631                 c = *cp++;
 632
 633                 if (tag == TAG_PAD || tag == TAG_END)
 634                         len = 0;
 635                 else {
 636                         /* Get the length; check for truncation */
 637                         ND_TCHECK2(*bp, 1);
 638                         len = *bp++;
 639                 }
 640
 641                 ND_PRINT((ndo, "\n\t    %s Option %u, length %u%s", cp, tag, len,
 642                           len > 0 ? ": " : ""));
 643
 644                 if (tag == TAG_PAD && ndo->ndo_vflag > 2) {
 645                         u_int ntag = 1;
 646                         while (ND_TTEST2(*bp, 1) && *bp == TAG_PAD) {
 647                                 bp++;
 648                                 ntag++;
 649                         }
 650                         if (ntag > 1)
 651                                 ND_PRINT((ndo, ", occurs %u", ntag));
 652                 }
 653
 654                 if (!ND_TTEST2(*bp, len)) {
 655                         ND_PRINT((ndo, "[|rfc1048 %u]", len));
 656                         return;
 657                 }
 658
 659                 if (tag == TAG_DHCP_MESSAGE && len == 1) {
 660                         uc = *bp++;
 661                         ND_PRINT((ndo, "%s", tok2str(dhcp_msg_values, "Unknown (%u)", uc)));
 662                         continue;
 663                 }
 664
 665                 if (tag == TAG_PARM_REQUEST) {
 666                         idx = 0;
 667                         while (len-- > 0) {
 668                                 uc = *bp++;
 669                                 cp = tok2str(tag2str, "?Option %u", uc);
 670                                 if (idx % 4 == 0)
 671                                         ND_PRINT((ndo, "\n\t      "));
 672                                 else
 673                                         ND_PRINT((ndo, ", "));
 674                                 ND_PRINT((ndo, "%s", cp + 1));
 675                                 idx++;
 676                         }
 677                         continue;
 678                 }
 679
 680                 if (tag == TAG_EXTENDED_REQUEST) {
 681                         first = 1;
 682                         while (len > 1) {
 683                                 len -= 2;
 684                                 us = EXTRACT_16BITS(bp);
 685                                 bp += 2;
 686                                 cp = tok2str(xtag2str, "?xT%u", us);
 687                                 if (!first)
 688                                         ND_PRINT((ndo, "+"));
 689                                 ND_PRINT((ndo, "%s", cp + 1));
 690                                 first = 0;
 691                         }
 692                         continue;
 693                 }
 694
 695                 /* Print data */
 696                 if (c == '?') {
 697                         /* Base default formats for unknown tags on data size */
 698                         if (len & 1)
 699                                 c = 'b';
 700                         else if (len & 2)
 701                                 c = 's';
 702                         else
 703                                 c = 'l';
 704                 }
 705                 first = 1;
 706                 switch (c) {
 707
 708                 case 'a':
 709                         /* ascii strings */
 710                         ND_PRINT((ndo, "\""));
 711                         if (fn_printn(ndo, bp, len, ndo->ndo_snapend)) {
 712                                 ND_PRINT((ndo, "\""));
 713                                 goto trunc;
 714                         }
 715                         ND_PRINT((ndo, "\""));
 716                         bp += len;
 717                         len = 0;
 718                         break;
 719
 720                 case 'i':
 721                 case 'l':
 722                 case 'L':
 723                         /* ip addresses/32-bit words */
 724                         while (len >= sizeof(ul)) {
 725                                 if (!first)
 726                                         ND_PRINT((ndo, ","));
 727                                 ul = EXTRACT_32BITS(bp);
 728                                 if (c == 'i') {
 729                                         ul = htonl(ul);
 730                                         ND_PRINT((ndo, "%s", ipaddr_string(ndo, &ul)));
 731                                 } else if (c == 'L')
 732                                         ND_PRINT((ndo, "%d", ul));
 733                                 else
 734                                         ND_PRINT((ndo, "%u", ul));
 735                                 bp += sizeof(ul);
 736                                 len -= sizeof(ul);
 737                                 first = 0;
 738                         }
 739                         break;
 740
 741                 case 'p':
 742                         /* IP address pairs */
 743                         while (len >= 2*sizeof(ul)) {
 744                                 if (!first)
 745                                         ND_PRINT((ndo, ","));
 746                                 memcpy((char *)&ul, (const char *)bp, sizeof(ul));
 747                                 ND_PRINT((ndo, "(%s:", ipaddr_string(ndo, &ul)));
 748                                 bp += sizeof(ul);
 749                                 memcpy((char *)&ul, (const char *)bp, sizeof(ul));
 750                                 ND_PRINT((ndo, "%s)", ipaddr_string(ndo, &ul)));
 751                                 bp += sizeof(ul);
 752                                 len -= 2*sizeof(ul);
 753                                 first = 0;
 754                         }
 755                         break;
 756
 757                 case 's':
 758                         /* shorts */
 759                         while (len >= sizeof(us)) {
 760                                 if (!first)
 761                                         ND_PRINT((ndo, ","));
 762                                 us = EXTRACT_16BITS(bp);
 763                                 ND_PRINT((ndo, "%u", us));
 764                                 bp += sizeof(us);
 765                                 len -= sizeof(us);
 766                                 first = 0;
 767                         }
 768                         break;
 769
 770                 case 'B':
 771                         /* boolean */
 772                         while (len > 0) {
 773                                 if (!first)
 774                                         ND_PRINT((ndo, ","));
 775                                 switch (*bp) {
 776                                 case 0:
 777                                         ND_PRINT((ndo, "N"));
 778                                         break;
 779                                 case 1:
 780                                         ND_PRINT((ndo, "Y"));
 781                                         break;
 782                                 default:
 783                                         ND_PRINT((ndo, "%u?", *bp));
 784                                         break;
 785                                 }
 786                                 ++bp;
 787                                 --len;
 788                                 first = 0;
 789                         }
 790                         break;
 791
 792                 case 'b':
 793                 case 'x':
 794                 default:
 795                         /* Bytes */
 796                         while (len > 0) {
 797                                 if (!first)
 798                                         ND_PRINT((ndo, c == 'x' ? ":" : "."));
 799                                 if (c == 'x')
 800                                         ND_PRINT((ndo, "%02x", *bp));
 801                                 else
 802                                         ND_PRINT((ndo, "%u", *bp));
 803                                 ++bp;
 804                                 --len;
 805                                 first = 0;
 806                         }
 807                         break;
 808
 809                 case '$':
 810                         /* Guys we can't handle with one of the usual cases */
 811                         switch (tag) {
 812
 813                         case TAG_NETBIOS_NODE:
 814                                 /* this option should be at least 1 byte long */
 815                                 if (len < 1) {
 816                                         ND_PRINT((ndo, "ERROR: length < 1 bytes"));
 817                                         break;
 818                                 }
 819                                 tag = *bp++;
 820                                 --len;
 821                                 ND_PRINT((ndo, "%s", tok2str(nbo2str, NULL, tag)));
 822                                 break;
 823
 824                         case TAG_OPT_OVERLOAD:
 825                                 /* this option should be at least 1 byte long */
 826                                 if (len < 1) {
 827                                         ND_PRINT((ndo, "ERROR: length < 1 bytes"));
 828                                         break;
 829                                 }
 830                                 tag = *bp++;
 831                                 --len;
 832                                 ND_PRINT((ndo, "%s", tok2str(oo2str, NULL, tag)));
 833                                 break;
 834
 835                         case TAG_CLIENT_FQDN:
 836                                 /* this option should be at least 3 bytes long */
 837                                 if (len < 3) {
 838                                         ND_PRINT((ndo, "ERROR: length < 3 bytes"));
 839                                         bp += len;
 840                                         len = 0;
 841                                         break;
 842                                 }
 843                                 if (*bp)
 844                                         ND_PRINT((ndo, "[%s] ", client_fqdn_flags(*bp)));
 845                                 bp++;
 846                                 if (*bp || *(bp+1))
 847                                         ND_PRINT((ndo, "%u/%u ", *bp, *(bp+1)));
 848                                 bp += 2;
 849                                 ND_PRINT((ndo, "\""));
 850                                 if (fn_printn(ndo, bp, len - 3, ndo->ndo_snapend)) {
 851                                         ND_PRINT((ndo, "\""));
 852                                         goto trunc;
 853                                 }
 854                                 ND_PRINT((ndo, "\""));
 855                                 bp += len - 3;
 856                                 len = 0;
 857                                 break;
 858
 859                         case TAG_CLIENT_ID:
 860                             {
 861                                 int type;
 862
 863                                 /* this option should be at least 1 byte long */
 864                                 if (len < 1) {
 865                                         ND_PRINT((ndo, "ERROR: length < 1 bytes"));
 866                                         break;
 867                                 }
 868                                 type = *bp++;
 869                                 len--;
 870                                 if (type == 0) {
 871                                         ND_PRINT((ndo, "\""));
 872                                         if (fn_printn(ndo, bp, len, ndo->ndo_snapend)) {
 873                                                 ND_PRINT((ndo, "\""));
 874                                                 goto trunc;
 875                                         }
 876                                         ND_PRINT((ndo, "\""));
 877                                         bp += len;
 878                                         len = 0;
 879                                         break;
 880                                 } else {
 881                                         ND_PRINT((ndo, "%s ", tok2str(arp2str, "hardware-type %u,", type)));
 882                                         while (len > 0) {
 883                                                 if (!first)
 884                                                         ND_PRINT((ndo, ":"));
 885                                                 ND_PRINT((ndo, "%02x", *bp));
 886                                                 ++bp;
 887                                                 --len;
 888                                                 first = 0;
 889                                         }
 890                                 }
 891                                 break;
 892                             }
 893
 894                         case TAG_AGENT_CIRCUIT:
 895                                 while (len >= 2) {
 896                                         subopt = *bp++;
 897                                         suboptlen = *bp++;
 898                                         len -= 2;
 899                                         if (suboptlen > len) {
 900                                                 ND_PRINT((ndo, "\n\t      %s SubOption %u, length %u: length goes past end of option",
 901                                                           tok2str(agent_suboption_values, "Unknown", subopt),
 902                                                           subopt,
 903                                                           suboptlen));
 904                                                 bp += len;
 905                                                 len = 0;
 906                                                 break;
 907                                         }
 908                                         ND_PRINT((ndo, "\n\t      %s SubOption %u, length %u: ",
 909                                                   tok2str(agent_suboption_values, "Unknown", subopt),
 910                                                   subopt,
 911                                                   suboptlen));
 912                                         switch (subopt) {
 913
 914                                         case AGENT_SUBOPTION_CIRCUIT_ID: /* fall through */
 915                                         case AGENT_SUBOPTION_REMOTE_ID:
 916                                         case AGENT_SUBOPTION_SUBSCRIBER_ID:
 917                                                 if (fn_printn(ndo, bp, suboptlen, ndo->ndo_snapend))
 918                                                         goto trunc;
 919                                                 break;
 920
 921                                         default:
 922                                                 print_unknown_data(ndo, bp, "\n\t\t", suboptlen);
 923                                         }
 924
 925                                         len -= suboptlen;
 926                                         bp += suboptlen;
 927                                 }
 928                                 break;
 929
 930                         case TAG_CLASSLESS_STATIC_RT:
 931                         case TAG_CLASSLESS_STA_RT_MS:
 932                             {
 933                                 u_int mask_width, significant_octets, i;
 934
 935                                 /* this option should be at least 5 bytes long */
 936                                 if (len < 5) {
 937                                         ND_PRINT((ndo, "ERROR: length < 5 bytes"));
 938                                         bp += len;
 939                                         len = 0;
 940                                         break;
 941                                 }
 942                                 while (len > 0) {
 943                                         if (!first)
 944                                                 ND_PRINT((ndo, ","));
 945                                         mask_width = *bp++;
 946                                         len--;
 947                                         /* mask_width <= 32 */
 948                                         if (mask_width > 32) {
 949                                                 ND_PRINT((ndo, "[ERROR: Mask width (%d) > 32]", mask_width));
 950                                                 bp += len;
 951                                                 len = 0;
 952                                                 break;
 953                                         }
 954                                         significant_octets = (mask_width + 7) / 8;
 955                                         /* significant octets + router(4) */
 956                                         if (len < significant_octets + 4) {
 957                                                 ND_PRINT((ndo, "[ERROR: Remaining length (%u) < %u bytes]", len, significant_octets + 4));
 958                                                 bp += len;
 959                                                 len = 0;
 960                                                 break;
 961                                         }
 962                                         ND_PRINT((ndo, "("));
 963                                         if (mask_width == 0)
 964                                                 ND_PRINT((ndo, "default"));
 965                                         else {
 966                                                 for (i = 0; i < significant_octets ; i++) {
 967                                                         if (i > 0)
 968                                                                 ND_PRINT((ndo, "."));
 969                                                         ND_PRINT((ndo, "%d", *bp++));
 970                                                 }
 971                                                 for (i = significant_octets ; i < 4 ; i++)
 972                                                         ND_PRINT((ndo, ".0"));
 973                                                 ND_PRINT((ndo, "/%d", mask_width));
 974                                         }
 975                                         memcpy((char *)&ul, (const char *)bp, sizeof(ul));
 976                                         ND_PRINT((ndo, ":%s)", ipaddr_string(ndo, &ul)));
 977                                         bp += sizeof(ul);
 978                                         len -= (significant_octets + 4);
 979                                         first = 0;
 980                                 }
 981                                 break;
 982                             }
 983
 984                         case TAG_USER_CLASS:
 985                             {
 986                                 u_int suboptnumber = 1;
 987
 988                                 first = 1;
 989                                 if (len < 2) {
 990                                         ND_PRINT((ndo, "ERROR: length < 2 bytes"));
 991                                         bp += len;
 992                                         len = 0;
 993                                         break;
 994                                 }
 995                                 while (len > 0) {
 996                                         suboptlen = *bp++;
 997                                         len--;
 998                                         ND_PRINT((ndo, "\n\t      "));
 999                                         ND_PRINT((ndo, "instance#%u: ", suboptnumber));
1000                                         if (suboptlen == 0) {
1001                                                 ND_PRINT((ndo, "ERROR: suboption length must be non-zero"));
1002                                                 bp += len;
1003                                                 len = 0;
1004                                                 break;
1005                                         }
1006                                         if (len < suboptlen) {
1007                                                 ND_PRINT((ndo, "ERROR: invalid option"));
1008                                                 bp += len;
1009                                                 len = 0;
1010                                                 break;
1011                                         }
1012                                         ND_PRINT((ndo, "\""));
1013                                         if (fn_printn(ndo, bp, suboptlen, ndo->ndo_snapend)) {
1014                                                 ND_PRINT((ndo, "\""));
1015                                                 goto trunc;
1016                                         }
1017                                         ND_PRINT((ndo, "\""));
1018                                         ND_PRINT((ndo, ", length %d", suboptlen));
1019                                         suboptnumber++;
1020                                         len -= suboptlen;
1021                                         bp += suboptlen;
1022                                 }
1023                                 break;
1024                             }
1025
1026                         default:
1027                                 ND_PRINT((ndo, "[unknown special tag %u, size %u]",
1028                                           tag, len));
1029                                 bp += len;
1030                                 len = 0;
1031                                 break;
1032                         }
1033                         break;
1034                 }
1035                 /* Data left over? */
1036                 if (len) {
1037                         ND_PRINT((ndo, "\n\t  trailing data length %u", len));
1038                         bp += len;
1039                 }
1040         }
1041         return;
1042 trunc:
1043         ND_PRINT((ndo, "|[rfc1048]"));
1044 }
1045
1046 static void
1047 cmu_print(netdissect_options *ndo,
1048           register const u_char *bp)
1049 {
1050         register const struct cmu_vend *cmu;
1051
1052 #define PRINTCMUADDR(m, s) { ND_TCHECK(cmu->m); \
1053     if (cmu->m.s_addr != 0) \
1054         ND_PRINT((ndo, " %s:%s", s, ipaddr_string(ndo, &cmu->m.s_addr))); }
1055
1056         ND_PRINT((ndo, " vend-cmu"));
1057         cmu = (const struct cmu_vend *)bp;
1058
1059         /* Only print if there are unknown bits */
1060         ND_TCHECK(cmu->v_flags);
1061         if ((cmu->v_flags & ~(VF_SMASK)) != 0)
1062                 ND_PRINT((ndo, " F:0x%x", cmu->v_flags));
1063         PRINTCMUADDR(v_dgate, "DG");
1064         PRINTCMUADDR(v_smask, cmu->v_flags & VF_SMASK ? "SM" : "SM*");
1065         PRINTCMUADDR(v_dns1, "NS1");
1066         PRINTCMUADDR(v_dns2, "NS2");
1067         PRINTCMUADDR(v_ins1, "IEN1");
1068         PRINTCMUADDR(v_ins2, "IEN2");
1069         PRINTCMUADDR(v_ts1, "TS1");
1070         PRINTCMUADDR(v_ts2, "TS2");
1071         return;
1072
1073 trunc:
1074         ND_PRINT((ndo, "%s", tstr));
1075 #undef PRINTCMUADDR
1076 }
1077
1078 static char *
1079 client_fqdn_flags(u_int flags)
1080 {
1081         static char buf[8+1];
1082         int i = 0;
1083
1084         if (flags & CLIENT_FQDN_FLAGS_S)
1085                 buf[i++] = 'S';
1086         if (flags & CLIENT_FQDN_FLAGS_O)
1087                 buf[i++] = 'O';
1088         if (flags & CLIENT_FQDN_FLAGS_E)
1089                 buf[i++] = 'E';
1090         if (flags & CLIENT_FQDN_FLAGS_N)
1091                 buf[i++] = 'N';
1092         buf[i] = '\0';
1093
1094         return buf;
1095 }