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 #include <sys/cdefs.h> 25 #ifndef lint 26 __RCSID("$NetBSD: print-bootp.c,v 1.7 2017/01/24 23:29:13 christos Exp $"); 27 #endif 28 29 #ifdef HAVE_CONFIG_H 30 #include "config.h" 31 #endif 32 33 #include <netdissect-stdinc.h> 34 35 #include <string.h> 36 37 #include "netdissect.h" 38 #include "addrtoname.h" 39 #include "extract.h" 40 41 static const char tstr[] = " [|bootp]"; 42 43 /* 44 * Bootstrap Protocol (BOOTP). RFC951 and RFC1048. 45 * 46 * This file specifies the "implementation-independent" BOOTP protocol 47 * information which is common to both client and server. 48 * 49 * Copyright 1988 by Carnegie Mellon. 50 * 51 * Permission to use, copy, modify, and distribute this program for any 52 * purpose and without fee is hereby granted, provided that this copyright 53 * and permission notice appear on all copies and supporting documentation, 54 * the name of Carnegie Mellon not be used in advertising or publicity 55 * pertaining to distribution of the program without specific prior 56 * permission, and notice be given in supporting documentation that copying 57 * and distribution is by permission of Carnegie Mellon and Stanford 58 * University. Carnegie Mellon makes no representations about the 59 * suitability of this software for any purpose. It is provided "as is" 60 * without express or implied warranty. 61 */ 62 63 struct bootp { 64 uint8_t bp_op; /* packet opcode type */ 65 uint8_t bp_htype; /* hardware addr type */ 66 uint8_t bp_hlen; /* hardware addr length */ 67 uint8_t bp_hops; /* gateway hops */ 68 uint32_t bp_xid; /* transaction ID */ 69 uint16_t bp_secs; /* seconds since boot began */ 70 uint16_t bp_flags; /* flags - see bootp_flag_values[] 71 in print-bootp.c */ 72 struct in_addr bp_ciaddr; /* client IP address */ 73 struct in_addr bp_yiaddr; /* 'your' IP address */ 74 struct in_addr bp_siaddr; /* server IP address */ 75 struct in_addr bp_giaddr; /* gateway IP address */ 76 uint8_t bp_chaddr[16]; /* client hardware address */ 77 uint8_t bp_sname[64]; /* server host name */ 78 uint8_t bp_file[128]; /* boot file name */ 79 uint8_t bp_vend[64]; /* vendor-specific area */ 80 } UNALIGNED; 81 82 #define BOOTPREPLY 2 83 #define BOOTPREQUEST 1 84 85 /* 86 * Vendor magic cookie (v_magic) for CMU 87 */ 88 #define VM_CMU "CMU" 89 90 /* 91 * Vendor magic cookie (v_magic) for RFC1048 92 */ 93 #define VM_RFC1048 { 99, 130, 83, 99 } 94 95 /* 96 * RFC1048 tag values used to specify what information is being supplied in 97 * the vendor field of the packet. 98 */ 99 100 #define TAG_PAD ((uint8_t) 0) 101 #define TAG_SUBNET_MASK ((uint8_t) 1) 102 #define TAG_TIME_OFFSET ((uint8_t) 2) 103 #define TAG_GATEWAY ((uint8_t) 3) 104 #define TAG_TIME_SERVER ((uint8_t) 4) 105 #define TAG_NAME_SERVER ((uint8_t) 5) 106 #define TAG_DOMAIN_SERVER ((uint8_t) 6) 107 #define TAG_LOG_SERVER ((uint8_t) 7) 108 #define TAG_COOKIE_SERVER ((uint8_t) 8) 109 #define TAG_LPR_SERVER ((uint8_t) 9) 110 #define TAG_IMPRESS_SERVER ((uint8_t) 10) 111 #define TAG_RLP_SERVER ((uint8_t) 11) 112 #define TAG_HOSTNAME ((uint8_t) 12) 113 #define TAG_BOOTSIZE ((uint8_t) 13) 114 #define TAG_END ((uint8_t) 255) 115 /* RFC1497 tags */ 116 #define TAG_DUMPPATH ((uint8_t) 14) 117 #define TAG_DOMAINNAME ((uint8_t) 15) 118 #define TAG_SWAP_SERVER ((uint8_t) 16) 119 #define TAG_ROOTPATH ((uint8_t) 17) 120 #define TAG_EXTPATH ((uint8_t) 18) 121 /* RFC2132 */ 122 #define TAG_IP_FORWARD ((uint8_t) 19) 123 #define TAG_NL_SRCRT ((uint8_t) 20) 124 #define TAG_PFILTERS ((uint8_t) 21) 125 #define TAG_REASS_SIZE ((uint8_t) 22) 126 #define TAG_DEF_TTL ((uint8_t) 23) 127 #define TAG_MTU_TIMEOUT ((uint8_t) 24) 128 #define TAG_MTU_TABLE ((uint8_t) 25) 129 #define TAG_INT_MTU ((uint8_t) 26) 130 #define TAG_LOCAL_SUBNETS ((uint8_t) 27) 131 #define TAG_BROAD_ADDR ((uint8_t) 28) 132 #define TAG_DO_MASK_DISC ((uint8_t) 29) 133 #define TAG_SUPPLY_MASK ((uint8_t) 30) 134 #define TAG_DO_RDISC ((uint8_t) 31) 135 #define TAG_RTR_SOL_ADDR ((uint8_t) 32) 136 #define TAG_STATIC_ROUTE ((uint8_t) 33) 137 #define TAG_USE_TRAILERS ((uint8_t) 34) 138 #define TAG_ARP_TIMEOUT ((uint8_t) 35) 139 #define TAG_ETH_ENCAP ((uint8_t) 36) 140 #define TAG_TCP_TTL ((uint8_t) 37) 141 #define TAG_TCP_KEEPALIVE ((uint8_t) 38) 142 #define TAG_KEEPALIVE_GO ((uint8_t) 39) 143 #define TAG_NIS_DOMAIN ((uint8_t) 40) 144 #define TAG_NIS_SERVERS ((uint8_t) 41) 145 #define TAG_NTP_SERVERS ((uint8_t) 42) 146 #define TAG_VENDOR_OPTS ((uint8_t) 43) 147 #define TAG_NETBIOS_NS ((uint8_t) 44) 148 #define TAG_NETBIOS_DDS ((uint8_t) 45) 149 #define TAG_NETBIOS_NODE ((uint8_t) 46) 150 #define TAG_NETBIOS_SCOPE ((uint8_t) 47) 151 #define TAG_XWIN_FS ((uint8_t) 48) 152 #define TAG_XWIN_DM ((uint8_t) 49) 153 #define TAG_NIS_P_DOMAIN ((uint8_t) 64) 154 #define TAG_NIS_P_SERVERS ((uint8_t) 65) 155 #define TAG_MOBILE_HOME ((uint8_t) 68) 156 #define TAG_SMPT_SERVER ((uint8_t) 69) 157 #define TAG_POP3_SERVER ((uint8_t) 70) 158 #define TAG_NNTP_SERVER ((uint8_t) 71) 159 #define TAG_WWW_SERVER ((uint8_t) 72) 160 #define TAG_FINGER_SERVER ((uint8_t) 73) 161 #define TAG_IRC_SERVER ((uint8_t) 74) 162 #define TAG_STREETTALK_SRVR ((uint8_t) 75) 163 #define TAG_STREETTALK_STDA ((uint8_t) 76) 164 /* DHCP options */ 165 #define TAG_REQUESTED_IP ((uint8_t) 50) 166 #define TAG_IP_LEASE ((uint8_t) 51) 167 #define TAG_OPT_OVERLOAD ((uint8_t) 52) 168 #define TAG_TFTP_SERVER ((uint8_t) 66) 169 #define TAG_BOOTFILENAME ((uint8_t) 67) 170 #define TAG_DHCP_MESSAGE ((uint8_t) 53) 171 #define TAG_SERVER_ID ((uint8_t) 54) 172 #define TAG_PARM_REQUEST ((uint8_t) 55) 173 #define TAG_MESSAGE ((uint8_t) 56) 174 #define TAG_MAX_MSG_SIZE ((uint8_t) 57) 175 #define TAG_RENEWAL_TIME ((uint8_t) 58) 176 #define TAG_REBIND_TIME ((uint8_t) 59) 177 #define TAG_VENDOR_CLASS ((uint8_t) 60) 178 #define TAG_CLIENT_ID ((uint8_t) 61) 179 /* RFC 2241 */ 180 #define TAG_NDS_SERVERS ((uint8_t) 85) 181 #define TAG_NDS_TREE_NAME ((uint8_t) 86) 182 #define TAG_NDS_CONTEXT ((uint8_t) 87) 183 /* RFC 2242 */ 184 #define TAG_NDS_IPDOMAIN ((uint8_t) 62) 185 #define TAG_NDS_IPINFO ((uint8_t) 63) 186 /* RFC 2485 */ 187 #define TAG_OPEN_GROUP_UAP ((uint8_t) 98) 188 /* RFC 2563 */ 189 #define TAG_DISABLE_AUTOCONF ((uint8_t) 116) 190 /* RFC 2610 */ 191 #define TAG_SLP_DA ((uint8_t) 78) 192 #define TAG_SLP_SCOPE ((uint8_t) 79) 193 /* RFC 2937 */ 194 #define TAG_NS_SEARCH ((uint8_t) 117) 195 /* RFC 3004 - The User Class Option for DHCP */ 196 #define TAG_USER_CLASS ((uint8_t) 77) 197 /* RFC 3011 */ 198 #define TAG_IP4_SUBNET_SELECT ((uint8_t) 118) 199 /* RFC 3442 */ 200 #define TAG_CLASSLESS_STATIC_RT ((uint8_t) 121) 201 #define TAG_CLASSLESS_STA_RT_MS ((uint8_t) 249) 202 /* RFC 5859 - TFTP Server Address Option for DHCPv4 */ 203 #define TAG_TFTP_SERVER_ADDRESS ((uint8_t) 150) 204 /* ftp://ftp.isi.edu/.../assignments/bootp-dhcp-extensions */ 205 #define TAG_SLP_NAMING_AUTH ((uint8_t) 80) 206 #define TAG_CLIENT_FQDN ((uint8_t) 81) 207 #define TAG_AGENT_CIRCUIT ((uint8_t) 82) 208 #define TAG_AGENT_REMOTE ((uint8_t) 83) 209 #define TAG_AGENT_MASK ((uint8_t) 84) 210 #define TAG_TZ_STRING ((uint8_t) 88) 211 #define TAG_FQDN_OPTION ((uint8_t) 89) 212 #define TAG_AUTH ((uint8_t) 90) 213 #define TAG_VINES_SERVERS ((uint8_t) 91) 214 #define TAG_SERVER_RANK ((uint8_t) 92) 215 #define TAG_CLIENT_ARCH ((uint8_t) 93) 216 #define TAG_CLIENT_NDI ((uint8_t) 94) 217 #define TAG_CLIENT_GUID ((uint8_t) 97) 218 #define TAG_LDAP_URL ((uint8_t) 95) 219 #define TAG_6OVER4 ((uint8_t) 96) 220 #define TAG_PRINTER_NAME ((uint8_t) 100) 221 #define TAG_MDHCP_SERVER ((uint8_t) 101) 222 #define TAG_IPX_COMPAT ((uint8_t) 110) 223 #define TAG_NETINFO_PARENT ((uint8_t) 112) 224 #define TAG_NETINFO_PARENT_TAG ((uint8_t) 113) 225 #define TAG_URL ((uint8_t) 114) 226 #define TAG_FAILOVER ((uint8_t) 115) 227 #define TAG_EXTENDED_REQUEST ((uint8_t) 126) 228 #define TAG_EXTENDED_OPTION ((uint8_t) 127) 229 230 /* DHCP Message types (values for TAG_DHCP_MESSAGE option) */ 231 #define DHCPDISCOVER 1 232 #define DHCPOFFER 2 233 #define DHCPREQUEST 3 234 #define DHCPDECLINE 4 235 #define DHCPACK 5 236 #define DHCPNAK 6 237 #define DHCPRELEASE 7 238 #define DHCPINFORM 8 239 240 /* 241 * "vendor" data permitted for CMU bootp clients. 242 */ 243 244 struct cmu_vend { 245 uint8_t v_magic[4]; /* magic number */ 246 uint32_t v_flags; /* flags/opcodes, etc. */ 247 struct in_addr v_smask; /* Subnet mask */ 248 struct in_addr v_dgate; /* Default gateway */ 249 struct in_addr v_dns1, v_dns2; /* Domain name servers */ 250 struct in_addr v_ins1, v_ins2; /* IEN-116 name servers */ 251 struct in_addr v_ts1, v_ts2; /* Time servers */ 252 uint8_t v_unused[24]; /* currently unused */ 253 } UNALIGNED; 254 255 256 /* v_flags values */ 257 #define VF_SMASK 1 /* Subnet mask field contains valid data */ 258 259 /* RFC 4702 DHCP Client FQDN Option */ 260 261 #define CLIENT_FQDN_FLAGS_S 0x01 262 #define CLIENT_FQDN_FLAGS_O 0x02 263 #define CLIENT_FQDN_FLAGS_E 0x04 264 #define CLIENT_FQDN_FLAGS_N 0x08 265 /* end of original bootp.h */ 266 267 static void rfc1048_print(netdissect_options *, const u_char *); 268 static void cmu_print(netdissect_options *, const u_char *); 269 static char *client_fqdn_flags(u_int flags); 270 271 static const struct tok bootp_flag_values[] = { 272 { 0x8000, "Broadcast" }, 273 { 0, NULL} 274 }; 275 276 static const struct tok bootp_op_values[] = { 277 { BOOTPREQUEST, "Request" }, 278 { BOOTPREPLY, "Reply" }, 279 { 0, NULL} 280 }; 281 282 /* 283 * Print bootp requests 284 */ 285 void 286 bootp_print(netdissect_options *ndo, 287 register const u_char *cp, u_int length) 288 { 289 register const struct bootp *bp; 290 static const u_char vm_cmu[4] = VM_CMU; 291 static const u_char vm_rfc1048[4] = VM_RFC1048; 292 293 bp = (const struct bootp *)cp; 294 ND_TCHECK(bp->bp_op); 295 296 ND_PRINT((ndo, "BOOTP/DHCP, %s", 297 tok2str(bootp_op_values, "unknown (0x%02x)", bp->bp_op))); 298 299 if (bp->bp_htype == 1 && bp->bp_hlen == 6 && bp->bp_op == BOOTPREQUEST) { 300 ND_TCHECK2(bp->bp_chaddr[0], 6); 301 ND_PRINT((ndo, " from %s", etheraddr_string(ndo, bp->bp_chaddr))); 302 } 303 304 ND_PRINT((ndo, ", length %u", length)); 305 306 if (!ndo->ndo_vflag) 307 return; 308 309 ND_TCHECK(bp->bp_secs); 310 311 /* The usual hardware address type is 1 (10Mb Ethernet) */ 312 if (bp->bp_htype != 1) 313 ND_PRINT((ndo, ", htype %d", bp->bp_htype)); 314 315 /* The usual length for 10Mb Ethernet address is 6 bytes */ 316 if (bp->bp_htype != 1 || bp->bp_hlen != 6) 317 ND_PRINT((ndo, ", hlen %d", bp->bp_hlen)); 318 319 /* Only print interesting fields */ 320 if (bp->bp_hops) 321 ND_PRINT((ndo, ", hops %d", bp->bp_hops)); 322 if (EXTRACT_32BITS(&bp->bp_xid)) 323 ND_PRINT((ndo, ", xid 0x%x", EXTRACT_32BITS(&bp->bp_xid))); 324 if (EXTRACT_16BITS(&bp->bp_secs)) 325 ND_PRINT((ndo, ", secs %d", EXTRACT_16BITS(&bp->bp_secs))); 326 327 ND_PRINT((ndo, ", Flags [%s]", 328 bittok2str(bootp_flag_values, "none", EXTRACT_16BITS(&bp->bp_flags)))); 329 if (ndo->ndo_vflag > 1) 330 ND_PRINT((ndo, " (0x%04x)", EXTRACT_16BITS(&bp->bp_flags))); 331 332 /* Client's ip address */ 333 ND_TCHECK(bp->bp_ciaddr); 334 if (EXTRACT_32BITS(&bp->bp_ciaddr.s_addr)) 335 ND_PRINT((ndo, "\n\t Client-IP %s", ipaddr_string(ndo, &bp->bp_ciaddr))); 336 337 /* 'your' ip address (bootp client) */ 338 ND_TCHECK(bp->bp_yiaddr); 339 if (EXTRACT_32BITS(&bp->bp_yiaddr.s_addr)) 340 ND_PRINT((ndo, "\n\t Your-IP %s", ipaddr_string(ndo, &bp->bp_yiaddr))); 341 342 /* Server's ip address */ 343 ND_TCHECK(bp->bp_siaddr); 344 if (EXTRACT_32BITS(&bp->bp_siaddr.s_addr)) 345 ND_PRINT((ndo, "\n\t Server-IP %s", ipaddr_string(ndo, &bp->bp_siaddr))); 346 347 /* Gateway's ip address */ 348 ND_TCHECK(bp->bp_giaddr); 349 if (EXTRACT_32BITS(&bp->bp_giaddr.s_addr)) 350 ND_PRINT((ndo, "\n\t Gateway-IP %s", ipaddr_string(ndo, &bp->bp_giaddr))); 351 352 /* Client's Ethernet address */ 353 if (bp->bp_htype == 1 && bp->bp_hlen == 6) { 354 ND_TCHECK2(bp->bp_chaddr[0], 6); 355 ND_PRINT((ndo, "\n\t Client-Ethernet-Address %s", etheraddr_string(ndo, bp->bp_chaddr))); 356 } 357 358 ND_TCHECK2(bp->bp_sname[0], 1); /* check first char only */ 359 if (*bp->bp_sname) { 360 ND_PRINT((ndo, "\n\t sname \"")); 361 if (fn_print(ndo, bp->bp_sname, ndo->ndo_snapend)) { 362 ND_PRINT((ndo, "\"")); 363 ND_PRINT((ndo, "%s", tstr + 1)); 364 return; 365 } 366 ND_PRINT((ndo, "\"")); 367 } 368 ND_TCHECK2(bp->bp_file[0], 1); /* check first char only */ 369 if (*bp->bp_file) { 370 ND_PRINT((ndo, "\n\t file \"")); 371 if (fn_print(ndo, bp->bp_file, ndo->ndo_snapend)) { 372 ND_PRINT((ndo, "\"")); 373 ND_PRINT((ndo, "%s", tstr + 1)); 374 return; 375 } 376 ND_PRINT((ndo, "\"")); 377 } 378 379 /* Decode the vendor buffer */ 380 ND_TCHECK(bp->bp_vend[0]); 381 if (memcmp((const char *)bp->bp_vend, vm_rfc1048, 382 sizeof(uint32_t)) == 0) 383 rfc1048_print(ndo, bp->bp_vend); 384 else if (memcmp((const char *)bp->bp_vend, vm_cmu, 385 sizeof(uint32_t)) == 0) 386 cmu_print(ndo, bp->bp_vend); 387 else { 388 uint32_t ul; 389 390 ul = EXTRACT_32BITS(&bp->bp_vend); 391 if (ul != 0) 392 ND_PRINT((ndo, "\n\t Vendor-#0x%x", ul)); 393 } 394 395 return; 396 trunc: 397 ND_PRINT((ndo, "%s", tstr)); 398 } 399 400 /* 401 * The first character specifies the format to print: 402 * i - ip address (32 bits) 403 * p - ip address pairs (32 bits + 32 bits) 404 * l - long (32 bits) 405 * L - unsigned long (32 bits) 406 * s - short (16 bits) 407 * b - period-seperated decimal bytes (variable length) 408 * x - colon-seperated hex bytes (variable length) 409 * a - ascii string (variable length) 410 * B - on/off (8 bits) 411 * $ - special (explicit code to handle) 412 */ 413 static const struct tok tag2str[] = { 414 /* RFC1048 tags */ 415 { TAG_PAD, " PAD" }, 416 { TAG_SUBNET_MASK, "iSubnet-Mask" }, /* subnet mask (RFC950) */ 417 { TAG_TIME_OFFSET, "LTime-Zone" }, /* seconds from UTC */ 418 { TAG_GATEWAY, "iDefault-Gateway" }, /* default gateway */ 419 { TAG_TIME_SERVER, "iTime-Server" }, /* time servers (RFC868) */ 420 { TAG_NAME_SERVER, "iIEN-Name-Server" }, /* IEN name servers (IEN116) */ 421 { TAG_DOMAIN_SERVER, "iDomain-Name-Server" }, /* domain name (RFC1035) */ 422 { TAG_LOG_SERVER, "iLOG" }, /* MIT log servers */ 423 { TAG_COOKIE_SERVER, "iCS" }, /* cookie servers (RFC865) */ 424 { TAG_LPR_SERVER, "iLPR-Server" }, /* lpr server (RFC1179) */ 425 { TAG_IMPRESS_SERVER, "iIM" }, /* impress servers (Imagen) */ 426 { TAG_RLP_SERVER, "iRL" }, /* resource location (RFC887) */ 427 { TAG_HOSTNAME, "aHostname" }, /* ascii hostname */ 428 { TAG_BOOTSIZE, "sBS" }, /* 512 byte blocks */ 429 { TAG_END, " END" }, 430 /* RFC1497 tags */ 431 { TAG_DUMPPATH, "aDP" }, 432 { TAG_DOMAINNAME, "aDomain-Name" }, 433 { TAG_SWAP_SERVER, "iSS" }, 434 { TAG_ROOTPATH, "aRP" }, 435 { TAG_EXTPATH, "aEP" }, 436 /* RFC2132 tags */ 437 { TAG_IP_FORWARD, "BIPF" }, 438 { TAG_NL_SRCRT, "BSRT" }, 439 { TAG_PFILTERS, "pPF" }, 440 { TAG_REASS_SIZE, "sRSZ" }, 441 { TAG_DEF_TTL, "bTTL" }, 442 { TAG_MTU_TIMEOUT, "lMTU-Timeout" }, 443 { TAG_MTU_TABLE, "sMTU-Table" }, 444 { TAG_INT_MTU, "sMTU" }, 445 { TAG_LOCAL_SUBNETS, "BLSN" }, 446 { TAG_BROAD_ADDR, "iBR" }, 447 { TAG_DO_MASK_DISC, "BMD" }, 448 { TAG_SUPPLY_MASK, "BMS" }, 449 { TAG_DO_RDISC, "BRouter-Discovery" }, 450 { TAG_RTR_SOL_ADDR, "iRSA" }, 451 { TAG_STATIC_ROUTE, "pStatic-Route" }, 452 { TAG_USE_TRAILERS, "BUT" }, 453 { TAG_ARP_TIMEOUT, "lAT" }, 454 { TAG_ETH_ENCAP, "BIE" }, 455 { TAG_TCP_TTL, "bTT" }, 456 { TAG_TCP_KEEPALIVE, "lKI" }, 457 { TAG_KEEPALIVE_GO, "BKG" }, 458 { TAG_NIS_DOMAIN, "aYD" }, 459 { TAG_NIS_SERVERS, "iYS" }, 460 { TAG_NTP_SERVERS, "iNTP" }, 461 { TAG_VENDOR_OPTS, "bVendor-Option" }, 462 { TAG_NETBIOS_NS, "iNetbios-Name-Server" }, 463 { TAG_NETBIOS_DDS, "iWDD" }, 464 { TAG_NETBIOS_NODE, "$Netbios-Node" }, 465 { TAG_NETBIOS_SCOPE, "aNetbios-Scope" }, 466 { TAG_XWIN_FS, "iXFS" }, 467 { TAG_XWIN_DM, "iXDM" }, 468 { TAG_NIS_P_DOMAIN, "sN+D" }, 469 { TAG_NIS_P_SERVERS, "iN+S" }, 470 { TAG_MOBILE_HOME, "iMH" }, 471 { TAG_SMPT_SERVER, "iSMTP" }, 472 { TAG_POP3_SERVER, "iPOP3" }, 473 { TAG_NNTP_SERVER, "iNNTP" }, 474 { TAG_WWW_SERVER, "iWWW" }, 475 { TAG_FINGER_SERVER, "iFG" }, 476 { TAG_IRC_SERVER, "iIRC" }, 477 { TAG_STREETTALK_SRVR, "iSTS" }, 478 { TAG_STREETTALK_STDA, "iSTDA" }, 479 { TAG_REQUESTED_IP, "iRequested-IP" }, 480 { TAG_IP_LEASE, "lLease-Time" }, 481 { TAG_OPT_OVERLOAD, "$OO" }, 482 { TAG_TFTP_SERVER, "aTFTP" }, 483 { TAG_BOOTFILENAME, "aBF" }, 484 { TAG_DHCP_MESSAGE, " DHCP-Message" }, 485 { TAG_SERVER_ID, "iServer-ID" }, 486 { TAG_PARM_REQUEST, "bParameter-Request" }, 487 { TAG_MESSAGE, "aMSG" }, 488 { TAG_MAX_MSG_SIZE, "sMSZ" }, 489 { TAG_RENEWAL_TIME, "lRN" }, 490 { TAG_REBIND_TIME, "lRB" }, 491 { TAG_VENDOR_CLASS, "aVendor-Class" }, 492 { TAG_CLIENT_ID, "$Client-ID" }, 493 /* RFC 2485 */ 494 { TAG_OPEN_GROUP_UAP, "aUAP" }, 495 /* RFC 2563 */ 496 { TAG_DISABLE_AUTOCONF, "BNOAUTO" }, 497 /* RFC 2610 */ 498 { TAG_SLP_DA, "bSLP-DA" }, /*"b" is a little wrong */ 499 { TAG_SLP_SCOPE, "bSLP-SCOPE" }, /*"b" is a little wrong */ 500 /* RFC 2937 */ 501 { TAG_NS_SEARCH, "sNSSEARCH" }, /* XXX 's' */ 502 /* RFC 3004 - The User Class Option for DHCP */ 503 { TAG_USER_CLASS, "$User-Class" }, 504 /* RFC 3011 */ 505 { TAG_IP4_SUBNET_SELECT, "iSUBNET" }, 506 /* RFC 3442 */ 507 { TAG_CLASSLESS_STATIC_RT, "$Classless-Static-Route" }, 508 { TAG_CLASSLESS_STA_RT_MS, "$Classless-Static-Route-Microsoft" }, 509 /* RFC 5859 - TFTP Server Address Option for DHCPv4 */ 510 { TAG_TFTP_SERVER_ADDRESS, "iTFTP-Server-Address" }, 511 /* http://www.iana.org/assignments/bootp-dhcp-extensions/index.htm */ 512 { TAG_SLP_NAMING_AUTH, "aSLP-NA" }, 513 { TAG_CLIENT_FQDN, "$FQDN" }, 514 { TAG_AGENT_CIRCUIT, "$Agent-Information" }, 515 { TAG_AGENT_REMOTE, "bARMT" }, 516 { TAG_AGENT_MASK, "bAMSK" }, 517 { TAG_TZ_STRING, "aTZSTR" }, 518 { TAG_FQDN_OPTION, "bFQDNS" }, /* XXX 'b' */ 519 { TAG_AUTH, "bAUTH" }, /* XXX 'b' */ 520 { TAG_VINES_SERVERS, "iVINES" }, 521 { TAG_SERVER_RANK, "sRANK" }, 522 { TAG_CLIENT_ARCH, "sARCH" }, 523 { TAG_CLIENT_NDI, "bNDI" }, /* XXX 'b' */ 524 { TAG_CLIENT_GUID, "bGUID" }, /* XXX 'b' */ 525 { TAG_LDAP_URL, "aLDAP" }, 526 { TAG_6OVER4, "i6o4" }, 527 { TAG_PRINTER_NAME, "aPRTR" }, 528 { TAG_MDHCP_SERVER, "bMDHCP" }, /* XXX 'b' */ 529 { TAG_IPX_COMPAT, "bIPX" }, /* XXX 'b' */ 530 { TAG_NETINFO_PARENT, "iNI" }, 531 { TAG_NETINFO_PARENT_TAG, "aNITAG" }, 532 { TAG_URL, "aURL" }, 533 { TAG_FAILOVER, "bFAIL" }, /* XXX 'b' */ 534 { 0, NULL } 535 }; 536 /* 2-byte extended tags */ 537 static const struct tok xtag2str[] = { 538 { 0, NULL } 539 }; 540 541 /* DHCP "options overload" types */ 542 static const struct tok oo2str[] = { 543 { 1, "file" }, 544 { 2, "sname" }, 545 { 3, "file+sname" }, 546 { 0, NULL } 547 }; 548 549 /* NETBIOS over TCP/IP node type options */ 550 static const struct tok nbo2str[] = { 551 { 0x1, "b-node" }, 552 { 0x2, "p-node" }, 553 { 0x4, "m-node" }, 554 { 0x8, "h-node" }, 555 { 0, NULL } 556 }; 557 558 /* ARP Hardware types, for Client-ID option */ 559 static const struct tok arp2str[] = { 560 { 0x1, "ether" }, 561 { 0x6, "ieee802" }, 562 { 0x7, "arcnet" }, 563 { 0xf, "frelay" }, 564 { 0x17, "strip" }, 565 { 0x18, "ieee1394" }, 566 { 0, NULL } 567 }; 568 569 static const struct tok dhcp_msg_values[] = { 570 { DHCPDISCOVER, "Discover" }, 571 { DHCPOFFER, "Offer" }, 572 { DHCPREQUEST, "Request" }, 573 { DHCPDECLINE, "Decline" }, 574 { DHCPACK, "ACK" }, 575 { DHCPNAK, "NACK" }, 576 { DHCPRELEASE, "Release" }, 577 { DHCPINFORM, "Inform" }, 578 { 0, NULL } 579 }; 580 581 #define AGENT_SUBOPTION_CIRCUIT_ID 1 /* RFC 3046 */ 582 #define AGENT_SUBOPTION_REMOTE_ID 2 /* RFC 3046 */ 583 #define AGENT_SUBOPTION_SUBSCRIBER_ID 6 /* RFC 3993 */ 584 static const struct tok agent_suboption_values[] = { 585 { AGENT_SUBOPTION_CIRCUIT_ID, "Circuit-ID" }, 586 { AGENT_SUBOPTION_REMOTE_ID, "Remote-ID" }, 587 { AGENT_SUBOPTION_SUBSCRIBER_ID, "Subscriber-ID" }, 588 { 0, NULL } 589 }; 590 591 592 static void 593 rfc1048_print(netdissect_options *ndo, 594 register const u_char *bp) 595 { 596 register uint16_t tag; 597 register u_int len; 598 register const char *cp; 599 register char c; 600 int first, idx; 601 uint32_t ul; 602 uint16_t us; 603 uint8_t uc, subopt, suboptlen; 604 605 ND_PRINT((ndo, "\n\t Vendor-rfc1048 Extensions")); 606 607 /* Step over magic cookie */ 608 ND_PRINT((ndo, "\n\t Magic Cookie 0x%08x", EXTRACT_32BITS(bp))); 609 bp += sizeof(int32_t); 610 611 /* Loop while we there is a tag left in the buffer */ 612 while (ND_TTEST2(*bp, 1)) { 613 tag = *bp++; 614 if (tag == TAG_PAD && ndo->ndo_vflag < 3) 615 continue; 616 if (tag == TAG_END && ndo->ndo_vflag < 3) 617 return; 618 if (tag == TAG_EXTENDED_OPTION) { 619 ND_TCHECK2(*(bp + 1), 2); 620 tag = EXTRACT_16BITS(bp + 1); 621 /* XXX we don't know yet if the IANA will 622 * preclude overlap of 1-byte and 2-byte spaces. 623 * If not, we need to offset tag after this step. 624 */ 625 cp = tok2str(xtag2str, "?xT%u", tag); 626 } else 627 cp = tok2str(tag2str, "?T%u", tag); 628 c = *cp++; 629 630 if (tag == TAG_PAD || tag == TAG_END) 631 len = 0; 632 else { 633 /* Get the length; check for truncation */ 634 ND_TCHECK2(*bp, 1); 635 len = *bp++; 636 } 637 638 ND_PRINT((ndo, "\n\t %s Option %u, length %u%s", cp, tag, len, 639 len > 0 ? ": " : "")); 640 641 if (tag == TAG_PAD && ndo->ndo_vflag > 2) { 642 u_int ntag = 1; 643 while (ND_TTEST2(*bp, 1) && *bp == TAG_PAD) { 644 bp++; 645 ntag++; 646 } 647 if (ntag > 1) 648 ND_PRINT((ndo, ", occurs %u", ntag)); 649 } 650 651 if (!ND_TTEST2(*bp, len)) { 652 ND_PRINT((ndo, "[|rfc1048 %u]", len)); 653 return; 654 } 655 656 if (tag == TAG_DHCP_MESSAGE && len == 1) { 657 uc = *bp++; 658 ND_PRINT((ndo, "%s", tok2str(dhcp_msg_values, "Unknown (%u)", uc))); 659 continue; 660 } 661 662 if (tag == TAG_PARM_REQUEST) { 663 idx = 0; 664 while (len-- > 0) { 665 uc = *bp++; 666 cp = tok2str(tag2str, "?Option %u", uc); 667 if (idx % 4 == 0) 668 ND_PRINT((ndo, "\n\t ")); 669 else 670 ND_PRINT((ndo, ", ")); 671 ND_PRINT((ndo, "%s", cp + 1)); 672 idx++; 673 } 674 continue; 675 } 676 677 if (tag == TAG_EXTENDED_REQUEST) { 678 first = 1; 679 while (len > 1) { 680 len -= 2; 681 us = EXTRACT_16BITS(bp); 682 bp += 2; 683 cp = tok2str(xtag2str, "?xT%u", us); 684 if (!first) 685 ND_PRINT((ndo, "+")); 686 ND_PRINT((ndo, "%s", cp + 1)); 687 first = 0; 688 } 689 continue; 690 } 691 692 /* Print data */ 693 if (c == '?') { 694 /* Base default formats for unknown tags on data size */ 695 if (len & 1) 696 c = 'b'; 697 else if (len & 2) 698 c = 's'; 699 else 700 c = 'l'; 701 } 702 first = 1; 703 switch (c) { 704 705 case 'a': 706 /* ascii strings */ 707 ND_PRINT((ndo, "\"")); 708 if (fn_printn(ndo, bp, len, ndo->ndo_snapend)) { 709 ND_PRINT((ndo, "\"")); 710 goto trunc; 711 } 712 ND_PRINT((ndo, "\"")); 713 bp += len; 714 len = 0; 715 break; 716 717 case 'i': 718 case 'l': 719 case 'L': 720 /* ip addresses/32-bit words */ 721 while (len >= sizeof(ul)) { 722 if (!first) 723 ND_PRINT((ndo, ",")); 724 ul = EXTRACT_32BITS(bp); 725 if (c == 'i') { 726 ul = htonl(ul); 727 ND_PRINT((ndo, "%s", ipaddr_string(ndo, &ul))); 728 } else if (c == 'L') 729 ND_PRINT((ndo, "%d", ul)); 730 else 731 ND_PRINT((ndo, "%u", ul)); 732 bp += sizeof(ul); 733 len -= sizeof(ul); 734 first = 0; 735 } 736 break; 737 738 case 'p': 739 /* IP address pairs */ 740 while (len >= 2*sizeof(ul)) { 741 if (!first) 742 ND_PRINT((ndo, ",")); 743 memcpy((char *)&ul, (const char *)bp, sizeof(ul)); 744 ND_PRINT((ndo, "(%s:", ipaddr_string(ndo, &ul))); 745 bp += sizeof(ul); 746 memcpy((char *)&ul, (const char *)bp, sizeof(ul)); 747 ND_PRINT((ndo, "%s)", ipaddr_string(ndo, &ul))); 748 bp += sizeof(ul); 749 len -= 2*sizeof(ul); 750 first = 0; 751 } 752 break; 753 754 case 's': 755 /* shorts */ 756 while (len >= sizeof(us)) { 757 if (!first) 758 ND_PRINT((ndo, ",")); 759 us = EXTRACT_16BITS(bp); 760 ND_PRINT((ndo, "%u", us)); 761 bp += sizeof(us); 762 len -= sizeof(us); 763 first = 0; 764 } 765 break; 766 767 case 'B': 768 /* boolean */ 769 while (len > 0) { 770 if (!first) 771 ND_PRINT((ndo, ",")); 772 switch (*bp) { 773 case 0: 774 ND_PRINT((ndo, "N")); 775 break; 776 case 1: 777 ND_PRINT((ndo, "Y")); 778 break; 779 default: 780 ND_PRINT((ndo, "%u?", *bp)); 781 break; 782 } 783 ++bp; 784 --len; 785 first = 0; 786 } 787 break; 788 789 case 'b': 790 case 'x': 791 default: 792 /* Bytes */ 793 while (len > 0) { 794 if (!first) 795 ND_PRINT((ndo, c == 'x' ? ":" : ".")); 796 if (c == 'x') 797 ND_PRINT((ndo, "%02x", *bp)); 798 else 799 ND_PRINT((ndo, "%u", *bp)); 800 ++bp; 801 --len; 802 first = 0; 803 } 804 break; 805 806 case '$': 807 /* Guys we can't handle with one of the usual cases */ 808 switch (tag) { 809 810 case TAG_NETBIOS_NODE: 811 /* this option should be at least 1 byte long */ 812 if (len < 1) { 813 ND_PRINT((ndo, "ERROR: length < 1 bytes")); 814 break; 815 } 816 tag = *bp++; 817 --len; 818 ND_PRINT((ndo, "%s", tok2str(nbo2str, NULL, tag))); 819 break; 820 821 case TAG_OPT_OVERLOAD: 822 /* this option should be at least 1 byte long */ 823 if (len < 1) { 824 ND_PRINT((ndo, "ERROR: length < 1 bytes")); 825 break; 826 } 827 tag = *bp++; 828 --len; 829 ND_PRINT((ndo, "%s", tok2str(oo2str, NULL, tag))); 830 break; 831 832 case TAG_CLIENT_FQDN: 833 /* this option should be at least 3 bytes long */ 834 if (len < 3) { 835 ND_PRINT((ndo, "ERROR: length < 3 bytes")); 836 bp += len; 837 len = 0; 838 break; 839 } 840 if (*bp) 841 ND_PRINT((ndo, "[%s] ", client_fqdn_flags(*bp))); 842 bp++; 843 if (*bp || *(bp+1)) 844 ND_PRINT((ndo, "%u/%u ", *bp, *(bp+1))); 845 bp += 2; 846 ND_PRINT((ndo, "\"")); 847 if (fn_printn(ndo, bp, len - 3, ndo->ndo_snapend)) { 848 ND_PRINT((ndo, "\"")); 849 goto trunc; 850 } 851 ND_PRINT((ndo, "\"")); 852 bp += len - 3; 853 len = 0; 854 break; 855 856 case TAG_CLIENT_ID: 857 { 858 int type; 859 860 /* this option should be at least 1 byte long */ 861 if (len < 1) { 862 ND_PRINT((ndo, "ERROR: length < 1 bytes")); 863 break; 864 } 865 type = *bp++; 866 len--; 867 if (type == 0) { 868 ND_PRINT((ndo, "\"")); 869 if (fn_printn(ndo, bp, len, ndo->ndo_snapend)) { 870 ND_PRINT((ndo, "\"")); 871 goto trunc; 872 } 873 ND_PRINT((ndo, "\"")); 874 bp += len; 875 len = 0; 876 break; 877 } else { 878 ND_PRINT((ndo, "%s ", tok2str(arp2str, "hardware-type %u,", type))); 879 while (len > 0) { 880 if (!first) 881 ND_PRINT((ndo, ":")); 882 ND_PRINT((ndo, "%02x", *bp)); 883 ++bp; 884 --len; 885 first = 0; 886 } 887 } 888 break; 889 } 890 891 case TAG_AGENT_CIRCUIT: 892 while (len >= 2) { 893 subopt = *bp++; 894 suboptlen = *bp++; 895 len -= 2; 896 if (suboptlen > len) { 897 ND_PRINT((ndo, "\n\t %s SubOption %u, length %u: length goes past end of option", 898 tok2str(agent_suboption_values, "Unknown", subopt), 899 subopt, 900 suboptlen)); 901 bp += len; 902 len = 0; 903 break; 904 } 905 ND_PRINT((ndo, "\n\t %s SubOption %u, length %u: ", 906 tok2str(agent_suboption_values, "Unknown", subopt), 907 subopt, 908 suboptlen)); 909 switch (subopt) { 910 911 case AGENT_SUBOPTION_CIRCUIT_ID: /* fall through */ 912 case AGENT_SUBOPTION_REMOTE_ID: 913 case AGENT_SUBOPTION_SUBSCRIBER_ID: 914 if (fn_printn(ndo, bp, suboptlen, ndo->ndo_snapend)) 915 goto trunc; 916 break; 917 918 default: 919 print_unknown_data(ndo, bp, "\n\t\t", suboptlen); 920 } 921 922 len -= suboptlen; 923 bp += suboptlen; 924 } 925 break; 926 927 case TAG_CLASSLESS_STATIC_RT: 928 case TAG_CLASSLESS_STA_RT_MS: 929 { 930 u_int mask_width, significant_octets, i; 931 932 /* this option should be at least 5 bytes long */ 933 if (len < 5) { 934 ND_PRINT((ndo, "ERROR: length < 5 bytes")); 935 bp += len; 936 len = 0; 937 break; 938 } 939 while (len > 0) { 940 if (!first) 941 ND_PRINT((ndo, ",")); 942 mask_width = *bp++; 943 len--; 944 /* mask_width <= 32 */ 945 if (mask_width > 32) { 946 ND_PRINT((ndo, "[ERROR: Mask width (%d) > 32]", mask_width)); 947 bp += len; 948 len = 0; 949 break; 950 } 951 significant_octets = (mask_width + 7) / 8; 952 /* significant octets + router(4) */ 953 if (len < significant_octets + 4) { 954 ND_PRINT((ndo, "[ERROR: Remaining length (%u) < %u bytes]", len, significant_octets + 4)); 955 bp += len; 956 len = 0; 957 break; 958 } 959 ND_PRINT((ndo, "(")); 960 if (mask_width == 0) 961 ND_PRINT((ndo, "default")); 962 else { 963 for (i = 0; i < significant_octets ; i++) { 964 if (i > 0) 965 ND_PRINT((ndo, ".")); 966 ND_PRINT((ndo, "%d", *bp++)); 967 } 968 for (i = significant_octets ; i < 4 ; i++) 969 ND_PRINT((ndo, ".0")); 970 ND_PRINT((ndo, "/%d", mask_width)); 971 } 972 memcpy((char *)&ul, (const char *)bp, sizeof(ul)); 973 ND_PRINT((ndo, ":%s)", ipaddr_string(ndo, &ul))); 974 bp += sizeof(ul); 975 len -= (significant_octets + 4); 976 first = 0; 977 } 978 break; 979 } 980 981 case TAG_USER_CLASS: 982 { 983 u_int suboptnumber = 1; 984 985 first = 1; 986 if (len < 2) { 987 ND_PRINT((ndo, "ERROR: length < 2 bytes")); 988 bp += len; 989 len = 0; 990 break; 991 } 992 while (len > 0) { 993 suboptlen = *bp++; 994 len--; 995 ND_PRINT((ndo, "\n\t ")); 996 ND_PRINT((ndo, "instance#%u: ", suboptnumber)); 997 if (suboptlen == 0) { 998 ND_PRINT((ndo, "ERROR: suboption length must be non-zero")); 999 bp += len; 1000 len = 0; 1001 break; 1002 } 1003 if (len < suboptlen) { 1004 ND_PRINT((ndo, "ERROR: invalid option")); 1005 bp += len; 1006 len = 0; 1007 break; 1008 } 1009 ND_PRINT((ndo, "\"")); 1010 if (fn_printn(ndo, bp, suboptlen, ndo->ndo_snapend)) { 1011 ND_PRINT((ndo, "\"")); 1012 goto trunc; 1013 } 1014 ND_PRINT((ndo, "\"")); 1015 ND_PRINT((ndo, ", length %d", suboptlen)); 1016 suboptnumber++; 1017 len -= suboptlen; 1018 bp += suboptlen; 1019 } 1020 break; 1021 } 1022 1023 default: 1024 ND_PRINT((ndo, "[unknown special tag %u, size %u]", 1025 tag, len)); 1026 bp += len; 1027 len = 0; 1028 break; 1029 } 1030 break; 1031 } 1032 /* Data left over? */ 1033 if (len) { 1034 ND_PRINT((ndo, "\n\t trailing data length %u", len)); 1035 bp += len; 1036 } 1037 } 1038 return; 1039 trunc: 1040 ND_PRINT((ndo, "|[rfc1048]")); 1041 } 1042 1043 static void 1044 cmu_print(netdissect_options *ndo, 1045 register const u_char *bp) 1046 { 1047 register const struct cmu_vend *cmu; 1048 1049 #define PRINTCMUADDR(m, s) { ND_TCHECK(cmu->m); \ 1050 if (cmu->m.s_addr != 0) \ 1051 ND_PRINT((ndo, " %s:%s", s, ipaddr_string(ndo, &cmu->m.s_addr))); } 1052 1053 ND_PRINT((ndo, " vend-cmu")); 1054 cmu = (const struct cmu_vend *)bp; 1055 1056 /* Only print if there are unknown bits */ 1057 ND_TCHECK(cmu->v_flags); 1058 if ((cmu->v_flags & ~(VF_SMASK)) != 0) 1059 ND_PRINT((ndo, " F:0x%x", cmu->v_flags)); 1060 PRINTCMUADDR(v_dgate, "DG"); 1061 PRINTCMUADDR(v_smask, cmu->v_flags & VF_SMASK ? "SM" : "SM*"); 1062 PRINTCMUADDR(v_dns1, "NS1"); 1063 PRINTCMUADDR(v_dns2, "NS2"); 1064 PRINTCMUADDR(v_ins1, "IEN1"); 1065 PRINTCMUADDR(v_ins2, "IEN2"); 1066 PRINTCMUADDR(v_ts1, "TS1"); 1067 PRINTCMUADDR(v_ts2, "TS2"); 1068 return; 1069 1070 trunc: 1071 ND_PRINT((ndo, "%s", tstr)); 1072 #undef PRINTCMUADDR 1073 } 1074 1075 static char * 1076 client_fqdn_flags(u_int flags) 1077 { 1078 static char buf[8+1]; 1079 int i = 0; 1080 1081 if (flags & CLIENT_FQDN_FLAGS_S) 1082 buf[i++] = 'S'; 1083 if (flags & CLIENT_FQDN_FLAGS_O) 1084 buf[i++] = 'O'; 1085 if (flags & CLIENT_FQDN_FLAGS_E) 1086 buf[i++] = 'E'; 1087 if (flags & CLIENT_FQDN_FLAGS_N) 1088 buf[i++] = 'N'; 1089 buf[i] = '\0'; 1090 1091 return buf; 1092 } 1093