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