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