1 /* 2 * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that: (1) source code distributions 7 * retain the above copyright notice and this paragraph in its entirety, (2) 8 * distributions including binary code include the above copyright notice and 9 * this paragraph in its entirety in the documentation or other materials 10 * provided with the distribution, and (3) all advertising materials mentioning 11 * features or use of this software display the following acknowledgement: 12 * ``This product includes software developed by the University of California, 13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 14 * the University nor the names of its contributors may be used to endorse 15 * or promote products derived from this software without specific prior 16 * written permission. 17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20 */ 21 22 /* \summary: BOOTP and IPv4 DHCP printer */ 23 24 #include <config.h> 25 26 #include "netdissect-stdinc.h" 27 28 #include <string.h> 29 30 #include "netdissect.h" 31 #include "addrtoname.h" 32 #include "extract.h" 33 34 35 /* 36 * Bootstrap Protocol (BOOTP). RFC951 and RFC1048. 37 * 38 * This file specifies the "implementation-independent" BOOTP protocol 39 * information which is common to both client and server. 40 * 41 * Copyright 1988 by Carnegie Mellon. 42 * 43 * Permission to use, copy, modify, and distribute this program for any 44 * purpose and without fee is hereby granted, provided that this copyright 45 * and permission notice appear on all copies and supporting documentation, 46 * the name of Carnegie Mellon not be used in advertising or publicity 47 * pertaining to distribution of the program without specific prior 48 * permission, and notice be given in supporting documentation that copying 49 * and distribution is by permission of Carnegie Mellon and Stanford 50 * University. Carnegie Mellon makes no representations about the 51 * suitability of this software for any purpose. It is provided "as is" 52 * without express or implied warranty. 53 */ 54 55 struct bootp { 56 nd_uint8_t bp_op; /* packet opcode type */ 57 nd_uint8_t bp_htype; /* hardware addr type */ 58 nd_uint8_t bp_hlen; /* hardware addr length */ 59 nd_uint8_t bp_hops; /* gateway hops */ 60 nd_uint32_t bp_xid; /* transaction ID */ 61 nd_uint16_t bp_secs; /* seconds since boot began */ 62 nd_uint16_t bp_flags; /* flags - see bootp_flag_values[] 63 in print-bootp.c */ 64 nd_ipv4 bp_ciaddr; /* client IP address */ 65 nd_ipv4 bp_yiaddr; /* 'your' IP address */ 66 nd_ipv4 bp_siaddr; /* server IP address */ 67 nd_ipv4 bp_giaddr; /* gateway IP address */ 68 nd_byte bp_chaddr[16]; /* client hardware address */ 69 nd_byte bp_sname[64]; /* server host name */ 70 nd_byte bp_file[128]; /* boot file name */ 71 nd_byte bp_vend[64]; /* vendor-specific area */ 72 }; 73 74 #define BOOTPREPLY 2 75 #define BOOTPREQUEST 1 76 77 /* 78 * Vendor magic cookie (v_magic) for CMU 79 */ 80 #define VM_CMU "CMU" 81 82 /* 83 * Vendor magic cookie (v_magic) for RFC1048 84 */ 85 #define VM_RFC1048 { 99, 130, 83, 99 } 86 87 /* 88 * RFC1048 tag values used to specify what information is being supplied in 89 * the vendor field of the packet. 90 */ 91 92 #define TAG_PAD ((uint8_t) 0) 93 #define TAG_SUBNET_MASK ((uint8_t) 1) 94 #define TAG_TIME_OFFSET ((uint8_t) 2) 95 #define TAG_GATEWAY ((uint8_t) 3) 96 #define TAG_TIME_SERVER ((uint8_t) 4) 97 #define TAG_NAME_SERVER ((uint8_t) 5) 98 #define TAG_DOMAIN_SERVER ((uint8_t) 6) 99 #define TAG_LOG_SERVER ((uint8_t) 7) 100 #define TAG_COOKIE_SERVER ((uint8_t) 8) 101 #define TAG_LPR_SERVER ((uint8_t) 9) 102 #define TAG_IMPRESS_SERVER ((uint8_t) 10) 103 #define TAG_RLP_SERVER ((uint8_t) 11) 104 #define TAG_HOSTNAME ((uint8_t) 12) 105 #define TAG_BOOTSIZE ((uint8_t) 13) 106 #define TAG_END ((uint8_t) 255) 107 /* RFC1497 tags */ 108 #define TAG_DUMPPATH ((uint8_t) 14) 109 #define TAG_DOMAINNAME ((uint8_t) 15) 110 #define TAG_SWAP_SERVER ((uint8_t) 16) 111 #define TAG_ROOTPATH ((uint8_t) 17) 112 #define TAG_EXTPATH ((uint8_t) 18) 113 /* RFC2132 */ 114 #define TAG_IP_FORWARD ((uint8_t) 19) 115 #define TAG_NL_SRCRT ((uint8_t) 20) 116 #define TAG_PFILTERS ((uint8_t) 21) 117 #define TAG_REASS_SIZE ((uint8_t) 22) 118 #define TAG_DEF_TTL ((uint8_t) 23) 119 #define TAG_MTU_TIMEOUT ((uint8_t) 24) 120 #define TAG_MTU_TABLE ((uint8_t) 25) 121 #define TAG_INT_MTU ((uint8_t) 26) 122 #define TAG_LOCAL_SUBNETS ((uint8_t) 27) 123 #define TAG_BROAD_ADDR ((uint8_t) 28) 124 #define TAG_DO_MASK_DISC ((uint8_t) 29) 125 #define TAG_SUPPLY_MASK ((uint8_t) 30) 126 #define TAG_DO_RDISC ((uint8_t) 31) 127 #define TAG_RTR_SOL_ADDR ((uint8_t) 32) 128 #define TAG_STATIC_ROUTE ((uint8_t) 33) 129 #define TAG_USE_TRAILERS ((uint8_t) 34) 130 #define TAG_ARP_TIMEOUT ((uint8_t) 35) 131 #define TAG_ETH_ENCAP ((uint8_t) 36) 132 #define TAG_TCP_TTL ((uint8_t) 37) 133 #define TAG_TCP_KEEPALIVE ((uint8_t) 38) 134 #define TAG_KEEPALIVE_GO ((uint8_t) 39) 135 #define TAG_NIS_DOMAIN ((uint8_t) 40) 136 #define TAG_NIS_SERVERS ((uint8_t) 41) 137 #define TAG_NTP_SERVERS ((uint8_t) 42) 138 #define TAG_VENDOR_OPTS ((uint8_t) 43) 139 #define TAG_NETBIOS_NS ((uint8_t) 44) 140 #define TAG_NETBIOS_DDS ((uint8_t) 45) 141 #define TAG_NETBIOS_NODE ((uint8_t) 46) 142 #define TAG_NETBIOS_SCOPE ((uint8_t) 47) 143 #define TAG_XWIN_FS ((uint8_t) 48) 144 #define TAG_XWIN_DM ((uint8_t) 49) 145 #define TAG_NIS_P_DOMAIN ((uint8_t) 64) 146 #define TAG_NIS_P_SERVERS ((uint8_t) 65) 147 #define TAG_MOBILE_HOME ((uint8_t) 68) 148 #define TAG_SMTP_SERVER ((uint8_t) 69) 149 #define TAG_POP3_SERVER ((uint8_t) 70) 150 #define TAG_NNTP_SERVER ((uint8_t) 71) 151 #define TAG_WWW_SERVER ((uint8_t) 72) 152 #define TAG_FINGER_SERVER ((uint8_t) 73) 153 #define TAG_IRC_SERVER ((uint8_t) 74) 154 #define TAG_STREETTALK_SRVR ((uint8_t) 75) 155 #define TAG_STREETTALK_STDA ((uint8_t) 76) 156 /* DHCP options */ 157 #define TAG_REQUESTED_IP ((uint8_t) 50) 158 #define TAG_IP_LEASE ((uint8_t) 51) 159 #define TAG_OPT_OVERLOAD ((uint8_t) 52) 160 #define TAG_TFTP_SERVER ((uint8_t) 66) 161 #define TAG_BOOTFILENAME ((uint8_t) 67) 162 #define TAG_DHCP_MESSAGE ((uint8_t) 53) 163 #define TAG_SERVER_ID ((uint8_t) 54) 164 #define TAG_PARM_REQUEST ((uint8_t) 55) 165 #define TAG_MESSAGE ((uint8_t) 56) 166 #define TAG_MAX_MSG_SIZE ((uint8_t) 57) 167 #define TAG_RENEWAL_TIME ((uint8_t) 58) 168 #define TAG_REBIND_TIME ((uint8_t) 59) 169 #define TAG_VENDOR_CLASS ((uint8_t) 60) 170 #define TAG_CLIENT_ID ((uint8_t) 61) 171 /* RFC 2241 */ 172 #define TAG_NDS_SERVERS ((uint8_t) 85) 173 #define TAG_NDS_TREE_NAME ((uint8_t) 86) 174 #define TAG_NDS_CONTEXT ((uint8_t) 87) 175 /* RFC 2242 */ 176 #define TAG_NDS_IPDOMAIN ((uint8_t) 62) 177 #define TAG_NDS_IPINFO ((uint8_t) 63) 178 /* RFC 2485 */ 179 #define TAG_OPEN_GROUP_UAP ((uint8_t) 98) 180 /* RFC 2563 */ 181 #define TAG_DISABLE_AUTOCONF ((uint8_t) 116) 182 /* RFC 2610 */ 183 #define TAG_SLP_DA ((uint8_t) 78) 184 #define TAG_SLP_SCOPE ((uint8_t) 79) 185 /* RFC 2937 */ 186 #define TAG_NS_SEARCH ((uint8_t) 117) 187 /* RFC 3004 - The User Class Option for DHCP */ 188 #define TAG_USER_CLASS ((uint8_t) 77) 189 /* RFC 3011 */ 190 #define TAG_IP4_SUBNET_SELECT ((uint8_t) 118) 191 /* RFC 3442 */ 192 #define TAG_CLASSLESS_STATIC_RT ((uint8_t) 121) 193 #define TAG_CLASSLESS_STA_RT_MS ((uint8_t) 249) 194 /* RFC8572 */ 195 #define TAG_SZTP_REDIRECT ((uint8_t) 143) 196 /* RFC 5859 - TFTP Server Address Option for DHCPv4 */ 197 #define TAG_TFTP_SERVER_ADDRESS ((uint8_t) 150) 198 /* https://www.iana.org/assignments/bootp-dhcp-parameters/bootp-dhcp-parameters.xhtml */ 199 #define TAG_SLP_NAMING_AUTH ((uint8_t) 80) 200 #define TAG_CLIENT_FQDN ((uint8_t) 81) 201 #define TAG_AGENT_CIRCUIT ((uint8_t) 82) 202 #define TAG_AGENT_REMOTE ((uint8_t) 83) 203 #define TAG_TZ_STRING ((uint8_t) 88) 204 #define TAG_FQDN_OPTION ((uint8_t) 89) 205 #define TAG_AUTH ((uint8_t) 90) 206 #define TAG_CLIENT_LAST_TRANSACTION_TIME ((uint8_t) 91) 207 #define TAG_ASSOCIATED_IP ((uint8_t) 92) 208 #define TAG_CLIENT_ARCH ((uint8_t) 93) 209 #define TAG_CLIENT_NDI ((uint8_t) 94) 210 #define TAG_CLIENT_GUID ((uint8_t) 97) 211 #define TAG_LDAP_URL ((uint8_t) 95) 212 /* RFC 4833, TZ codes */ 213 #define TAG_TZ_PCODE ((uint8_t) 100) 214 #define TAG_TZ_TCODE ((uint8_t) 101) 215 #define TAG_NETINFO_PARENT ((uint8_t) 112) 216 #define TAG_NETINFO_PARENT_TAG ((uint8_t) 113) 217 #define TAG_URL ((uint8_t) 114) 218 #define TAG_MUDURL ((uint8_t) 161) 219 220 /* DHCP Message types (values for TAG_DHCP_MESSAGE option) */ 221 #define DHCPDISCOVER 1 222 #define DHCPOFFER 2 223 #define DHCPREQUEST 3 224 #define DHCPDECLINE 4 225 #define DHCPACK 5 226 #define DHCPNAK 6 227 #define DHCPRELEASE 7 228 #define DHCPINFORM 8 229 /* Defined in RFC4388 */ 230 #define DHCPLEASEQUERY 10 231 #define DHCPLEASEUNASSIGNED 11 232 #define DHCPLEASEUNKNOWN 12 233 #define DHCPLEASEACTIVE 13 234 235 236 /* 237 * "vendor" data permitted for CMU bootp clients. 238 */ 239 240 struct cmu_vend { 241 nd_byte v_magic[4]; /* magic number */ 242 nd_uint32_t v_flags; /* flags/opcodes, etc. */ 243 nd_ipv4 v_smask; /* Subnet mask */ 244 nd_ipv4 v_dgate; /* Default gateway */ 245 nd_ipv4 v_dns1, v_dns2; /* Domain name servers */ 246 nd_ipv4 v_ins1, v_ins2; /* IEN-116 name servers */ 247 nd_ipv4 v_ts1, v_ts2; /* Time servers */ 248 nd_byte v_unused[24]; /* currently unused */ 249 }; 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 const u_char *cp, u_int length) 284 { 285 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 uint8_t bp_op, bp_htype, bp_hlen; 289 290 ndo->ndo_protocol = "bootp"; 291 bp = (const struct bootp *)cp; 292 bp_op = GET_U_1(bp->bp_op); 293 ND_PRINT("BOOTP/DHCP, %s", 294 tok2str(bootp_op_values, "unknown (0x%02x)", bp_op)); 295 296 bp_htype = GET_U_1(bp->bp_htype); 297 bp_hlen = GET_U_1(bp->bp_hlen); 298 if (bp_htype == 1 && bp_hlen == MAC_ADDR_LEN && bp_op == BOOTPREQUEST) { 299 ND_PRINT(" from %s", GET_ETHERADDR_STRING(bp->bp_chaddr)); 300 } 301 302 ND_PRINT(", length %u", length); 303 304 if (!ndo->ndo_vflag) 305 return; 306 307 ND_TCHECK_2(bp->bp_secs); 308 309 /* The usual hardware address type is 1 (10Mb Ethernet) */ 310 if (bp_htype != 1) 311 ND_PRINT(", htype %u", bp_htype); 312 313 /* The usual length for 10Mb Ethernet address is 6 bytes */ 314 if (bp_htype != 1 || bp_hlen != MAC_ADDR_LEN) 315 ND_PRINT(", hlen %u", bp_hlen); 316 317 /* Only print interesting fields */ 318 if (GET_U_1(bp->bp_hops)) 319 ND_PRINT(", hops %u", GET_U_1(bp->bp_hops)); 320 if (GET_BE_U_4(bp->bp_xid)) 321 ND_PRINT(", xid 0x%x", GET_BE_U_4(bp->bp_xid)); 322 if (GET_BE_U_2(bp->bp_secs)) 323 ND_PRINT(", secs %u", GET_BE_U_2(bp->bp_secs)); 324 325 ND_PRINT(", Flags [%s]", 326 bittok2str(bootp_flag_values, "none", GET_BE_U_2(bp->bp_flags))); 327 if (ndo->ndo_vflag > 1) 328 ND_PRINT(" (0x%04x)", GET_BE_U_2(bp->bp_flags)); 329 330 /* Client's ip address */ 331 if (GET_IPV4_TO_NETWORK_ORDER(bp->bp_ciaddr)) 332 ND_PRINT("\n\t Client-IP %s", GET_IPADDR_STRING(bp->bp_ciaddr)); 333 334 /* 'your' ip address (bootp client) */ 335 if (GET_IPV4_TO_NETWORK_ORDER(bp->bp_yiaddr)) 336 ND_PRINT("\n\t Your-IP %s", GET_IPADDR_STRING(bp->bp_yiaddr)); 337 338 /* Server's ip address */ 339 if (GET_IPV4_TO_NETWORK_ORDER(bp->bp_siaddr)) 340 ND_PRINT("\n\t Server-IP %s", GET_IPADDR_STRING(bp->bp_siaddr)); 341 342 /* Gateway's ip address */ 343 if (GET_IPV4_TO_NETWORK_ORDER(bp->bp_giaddr)) 344 ND_PRINT("\n\t Gateway-IP %s", GET_IPADDR_STRING(bp->bp_giaddr)); 345 346 /* Client's Ethernet address */ 347 if (bp_htype == 1 && bp_hlen == MAC_ADDR_LEN) { 348 ND_PRINT("\n\t Client-Ethernet-Address %s", GET_ETHERADDR_STRING(bp->bp_chaddr)); 349 } 350 351 if (GET_U_1(bp->bp_sname)) { /* get first char only */ 352 ND_PRINT("\n\t sname \""); 353 if (nd_printztn(ndo, bp->bp_sname, (u_int)sizeof(bp->bp_sname), 354 ndo->ndo_snapend) == 0) { 355 ND_PRINT("\""); 356 nd_print_trunc(ndo); 357 return; 358 } 359 ND_PRINT("\""); 360 } 361 if (GET_U_1(bp->bp_file)) { /* get first char only */ 362 ND_PRINT("\n\t file \""); 363 if (nd_printztn(ndo, bp->bp_file, (u_int)sizeof(bp->bp_file), 364 ndo->ndo_snapend) == 0) { 365 ND_PRINT("\""); 366 nd_print_trunc(ndo); 367 return; 368 } 369 ND_PRINT("\""); 370 } 371 372 /* Decode the vendor buffer */ 373 ND_TCHECK_4(bp->bp_vend); 374 if (memcmp((const char *)bp->bp_vend, vm_rfc1048, 375 sizeof(uint32_t)) == 0) 376 rfc1048_print(ndo, bp->bp_vend); 377 else if (memcmp((const char *)bp->bp_vend, vm_cmu, 378 sizeof(uint32_t)) == 0) 379 cmu_print(ndo, bp->bp_vend); 380 else { 381 uint32_t ul; 382 383 ul = GET_BE_U_4(bp->bp_vend); 384 if (ul != 0) 385 ND_PRINT("\n\t Vendor-#0x%x", ul); 386 } 387 388 return; 389 trunc: 390 nd_print_trunc(ndo); 391 } 392 393 /* 394 * The first character specifies the format to print: 395 * i - ip address (32 bits) 396 * p - ip address pairs (32 bits + 32 bits) 397 * l - long (32 bits) 398 * L - unsigned long (32 bits) 399 * s - short (16 bits) 400 * b - period-separated decimal bytes (variable length) 401 * x - colon-separated hex bytes (variable length) 402 * a - ASCII string (variable length) 403 * B - on/off (8 bits) 404 * $ - special (explicit code to handle) 405 */ 406 static const struct tok tag2str[] = { 407 /* RFC1048 tags */ 408 { TAG_PAD, " PAD" }, 409 { TAG_SUBNET_MASK, "iSubnet-Mask" }, /* subnet mask (RFC950) */ 410 { TAG_TIME_OFFSET, "LTime-Zone" }, /* seconds from UTC */ 411 { TAG_GATEWAY, "iDefault-Gateway" }, /* default gateway */ 412 { TAG_TIME_SERVER, "iTime-Server" }, /* time servers (RFC868) */ 413 { TAG_NAME_SERVER, "iIEN-Name-Server" }, /* IEN name servers (IEN116) */ 414 { TAG_DOMAIN_SERVER, "iDomain-Name-Server" }, /* domain name (RFC1035) */ 415 { TAG_LOG_SERVER, "iLOG" }, /* MIT log servers */ 416 { TAG_COOKIE_SERVER, "iCS" }, /* cookie servers (RFC865) */ 417 { TAG_LPR_SERVER, "iLPR-Server" }, /* lpr server (RFC1179) */ 418 { TAG_IMPRESS_SERVER, "iIM" }, /* impress servers (Imagen) */ 419 { TAG_RLP_SERVER, "iRL" }, /* resource location (RFC887) */ 420 { TAG_HOSTNAME, "aHostname" }, /* ASCII hostname */ 421 { TAG_BOOTSIZE, "sBS" }, /* 512 byte blocks */ 422 { TAG_END, " END" }, 423 /* RFC1497 tags */ 424 { TAG_DUMPPATH, "aDP" }, 425 { TAG_DOMAINNAME, "aDomain-Name" }, 426 { TAG_SWAP_SERVER, "iSS" }, 427 { TAG_ROOTPATH, "aRP" }, 428 { TAG_EXTPATH, "aEP" }, 429 /* RFC2132 tags */ 430 { TAG_IP_FORWARD, "BIPF" }, 431 { TAG_NL_SRCRT, "BSRT" }, 432 { TAG_PFILTERS, "pPF" }, 433 { TAG_REASS_SIZE, "sRSZ" }, 434 { TAG_DEF_TTL, "bTTL" }, 435 { TAG_MTU_TIMEOUT, "lMTU-Timeout" }, 436 { TAG_MTU_TABLE, "sMTU-Table" }, 437 { TAG_INT_MTU, "sMTU" }, 438 { TAG_LOCAL_SUBNETS, "BLSN" }, 439 { TAG_BROAD_ADDR, "iBR" }, 440 { TAG_DO_MASK_DISC, "BMD" }, 441 { TAG_SUPPLY_MASK, "BMS" }, 442 { TAG_DO_RDISC, "BRouter-Discovery" }, 443 { TAG_RTR_SOL_ADDR, "iRSA" }, 444 { TAG_STATIC_ROUTE, "pStatic-Route" }, 445 { TAG_USE_TRAILERS, "BUT" }, 446 { TAG_ARP_TIMEOUT, "lAT" }, 447 { TAG_ETH_ENCAP, "BIE" }, 448 { TAG_TCP_TTL, "bTT" }, 449 { TAG_TCP_KEEPALIVE, "lKI" }, 450 { TAG_KEEPALIVE_GO, "BKG" }, 451 { TAG_NIS_DOMAIN, "aYD" }, 452 { TAG_NIS_SERVERS, "iYS" }, 453 { TAG_NTP_SERVERS, "iNTP" }, 454 { TAG_VENDOR_OPTS, "bVendor-Option" }, 455 { TAG_NETBIOS_NS, "iNetbios-Name-Server" }, 456 { TAG_NETBIOS_DDS, "iWDD" }, 457 { TAG_NETBIOS_NODE, "$Netbios-Node" }, 458 { TAG_NETBIOS_SCOPE, "aNetbios-Scope" }, 459 { TAG_XWIN_FS, "iXFS" }, 460 { TAG_XWIN_DM, "iXDM" }, 461 { TAG_NIS_P_DOMAIN, "sN+D" }, 462 { TAG_NIS_P_SERVERS, "iN+S" }, 463 { TAG_MOBILE_HOME, "iMH" }, 464 { TAG_SMTP_SERVER, "iSMTP" }, 465 { TAG_POP3_SERVER, "iPOP3" }, 466 { TAG_NNTP_SERVER, "iNNTP" }, 467 { TAG_WWW_SERVER, "iWWW" }, 468 { TAG_FINGER_SERVER, "iFG" }, 469 { TAG_IRC_SERVER, "iIRC" }, 470 { TAG_STREETTALK_SRVR, "iSTS" }, 471 { TAG_STREETTALK_STDA, "iSTDA" }, 472 { TAG_REQUESTED_IP, "iRequested-IP" }, 473 { TAG_IP_LEASE, "lLease-Time" }, 474 { TAG_OPT_OVERLOAD, "$OO" }, 475 { TAG_TFTP_SERVER, "aTFTP" }, 476 { TAG_BOOTFILENAME, "aBF" }, 477 { TAG_DHCP_MESSAGE, " DHCP-Message" }, 478 { TAG_SERVER_ID, "iServer-ID" }, 479 { TAG_PARM_REQUEST, "bParameter-Request" }, 480 { TAG_MESSAGE, "aMSG" }, 481 { TAG_MAX_MSG_SIZE, "sMSZ" }, 482 { TAG_RENEWAL_TIME, "lRN" }, 483 { TAG_REBIND_TIME, "lRB" }, 484 { TAG_VENDOR_CLASS, "aVendor-Class" }, 485 { TAG_CLIENT_ID, "$Client-ID" }, 486 /* RFC 2485 */ 487 { TAG_OPEN_GROUP_UAP, "aUAP" }, 488 /* RFC 2563 */ 489 { TAG_DISABLE_AUTOCONF, "BNOAUTO" }, 490 /* RFC 2610 */ 491 { TAG_SLP_DA, "bSLP-DA" }, /*"b" is a little wrong */ 492 { TAG_SLP_SCOPE, "bSLP-SCOPE" }, /*"b" is a little wrong */ 493 /* RFC 2937 */ 494 { TAG_NS_SEARCH, "sNSSEARCH" }, /* XXX 's' */ 495 /* RFC 3004 - The User Class Option for DHCP */ 496 { TAG_USER_CLASS, "$User-Class" }, 497 /* RFC 3011 */ 498 { TAG_IP4_SUBNET_SELECT, "iSUBNET" }, 499 /* RFC 3442 */ 500 { TAG_CLASSLESS_STATIC_RT, "$Classless-Static-Route" }, 501 { TAG_CLASSLESS_STA_RT_MS, "$Classless-Static-Route-Microsoft" }, 502 /* RFC 8572 */ 503 { TAG_SZTP_REDIRECT, "$SZTP-Redirect" }, 504 /* RFC 5859 - TFTP Server Address Option for DHCPv4 */ 505 { TAG_TFTP_SERVER_ADDRESS, "iTFTP-Server-Address" }, 506 /* https://www.iana.org/assignments/bootp-dhcp-parameters/bootp-dhcp-parameters.xhtml#options */ 507 { TAG_SLP_NAMING_AUTH, "aSLP-NA" }, 508 { TAG_CLIENT_FQDN, "$FQDN" }, 509 { TAG_AGENT_CIRCUIT, "$Agent-Information" }, 510 { TAG_AGENT_REMOTE, "bARMT" }, 511 { TAG_TZ_STRING, "aTZSTR" }, 512 { TAG_FQDN_OPTION, "bFQDNS" }, /* XXX 'b' */ 513 { TAG_AUTH, "bAUTH" }, /* XXX 'b' */ 514 { TAG_CLIENT_LAST_TRANSACTION_TIME, "LLast-Transaction-Time" }, 515 { TAG_ASSOCIATED_IP, "iAssociated-IP" }, 516 { TAG_CLIENT_ARCH, "sARCH" }, 517 { TAG_CLIENT_NDI, "bNDI" }, /* XXX 'b' */ 518 { TAG_CLIENT_GUID, "bGUID" }, /* XXX 'b' */ 519 { TAG_LDAP_URL, "aLDAP" }, 520 { TAG_TZ_PCODE, "aPOSIX-TZ" }, 521 { TAG_TZ_TCODE, "aTZ-Name" }, 522 { TAG_NETINFO_PARENT, "iNI" }, 523 { TAG_NETINFO_PARENT_TAG, "aNITAG" }, 524 { TAG_URL, "aURL" }, 525 { TAG_MUDURL, "aMUD-URL" }, 526 { 0, NULL } 527 }; 528 529 /* DHCP "options overload" types */ 530 static const struct tok oo2str[] = { 531 { 1, "file" }, 532 { 2, "sname" }, 533 { 3, "file+sname" }, 534 { 0, NULL } 535 }; 536 537 /* NETBIOS over TCP/IP node type options */ 538 static const struct tok nbo2str[] = { 539 { 0x1, "b-node" }, 540 { 0x2, "p-node" }, 541 { 0x4, "m-node" }, 542 { 0x8, "h-node" }, 543 { 0, NULL } 544 }; 545 546 /* ARP Hardware types, for Client-ID option */ 547 static const struct tok arp2str[] = { 548 { 0x1, "ether" }, 549 { 0x6, "ieee802" }, 550 { 0x7, "arcnet" }, 551 { 0xf, "frelay" }, 552 { 0x17, "strip" }, 553 { 0x18, "ieee1394" }, 554 { 0, NULL } 555 }; 556 557 static const struct tok dhcp_msg_values[] = { 558 { DHCPDISCOVER, "Discover" }, 559 { DHCPOFFER, "Offer" }, 560 { DHCPREQUEST, "Request" }, 561 { DHCPDECLINE, "Decline" }, 562 { DHCPACK, "ACK" }, 563 { DHCPNAK, "NACK" }, 564 { DHCPRELEASE, "Release" }, 565 { DHCPINFORM, "Inform" }, 566 { DHCPLEASEQUERY, "LeaseQuery" }, 567 { DHCPLEASEUNASSIGNED, "LeaseUnassigned" }, 568 { DHCPLEASEUNKNOWN, "LeaseUnknown" }, 569 { DHCPLEASEACTIVE, "LeaseActive" }, 570 { 0, NULL } 571 }; 572 573 #define AGENT_SUBOPTION_CIRCUIT_ID 1 /* RFC 3046 */ 574 #define AGENT_SUBOPTION_REMOTE_ID 2 /* RFC 3046 */ 575 #define AGENT_SUBOPTION_SUBSCRIBER_ID 6 /* RFC 3993 */ 576 static const struct tok agent_suboption_values[] = { 577 { AGENT_SUBOPTION_CIRCUIT_ID, "Circuit-ID" }, 578 { AGENT_SUBOPTION_REMOTE_ID, "Remote-ID" }, 579 { AGENT_SUBOPTION_SUBSCRIBER_ID, "Subscriber-ID" }, 580 { 0, NULL } 581 }; 582 583 584 static void 585 rfc1048_print(netdissect_options *ndo, 586 const u_char *bp) 587 { 588 uint16_t tag; 589 u_int len; 590 const char *cp; 591 char c; 592 int first, idx; 593 uint8_t subopt, suboptlen; 594 595 ND_PRINT("\n\t Vendor-rfc1048 Extensions"); 596 597 /* Step over magic cookie */ 598 ND_PRINT("\n\t Magic Cookie 0x%08x", GET_BE_U_4(bp)); 599 bp += sizeof(int32_t); 600 601 /* Loop while we there is a tag left in the buffer */ 602 while (ND_TTEST_1(bp)) { 603 tag = GET_U_1(bp); 604 bp++; 605 if (tag == TAG_PAD && ndo->ndo_vflag < 3) 606 continue; 607 if (tag == TAG_END && ndo->ndo_vflag < 3) 608 return; 609 cp = tok2str(tag2str, "?Unknown", tag); 610 c = *cp++; 611 612 if (tag == TAG_PAD || tag == TAG_END) 613 len = 0; 614 else { 615 /* Get the length; check for truncation */ 616 len = GET_U_1(bp); 617 bp++; 618 } 619 620 ND_PRINT("\n\t %s (%u), length %u%s", cp, tag, len, 621 len > 0 ? ": " : ""); 622 623 if (tag == TAG_PAD && ndo->ndo_vflag > 2) { 624 u_int ntag = 1; 625 while (ND_TTEST_1(bp) && 626 GET_U_1(bp) == TAG_PAD) { 627 bp++; 628 ntag++; 629 } 630 if (ntag > 1) 631 ND_PRINT(", occurs %u", ntag); 632 } 633 634 ND_TCHECK_LEN(bp, len); 635 636 if (tag == TAG_DHCP_MESSAGE && len == 1) { 637 ND_PRINT("%s", 638 tok2str(dhcp_msg_values, "Unknown (%u)", GET_U_1(bp))); 639 bp++; 640 continue; 641 } 642 643 if (tag == TAG_PARM_REQUEST) { 644 idx = 0; 645 while (len > 0) { 646 uint8_t innertag = GET_U_1(bp); 647 bp++; 648 len--; 649 cp = tok2str(tag2str, "?Unknown", innertag); 650 if (idx % 4 == 0) 651 ND_PRINT("\n\t "); 652 else 653 ND_PRINT(", "); 654 ND_PRINT("%s (%u)", cp + 1, innertag); 655 idx++; 656 } 657 continue; 658 } 659 660 /* Print data */ 661 if (c == '?') { 662 /* Base default formats for unknown tags on data size */ 663 if (len & 1) 664 c = 'b'; 665 else if (len & 2) 666 c = 's'; 667 else 668 c = 'l'; 669 } 670 first = 1; 671 switch (c) { 672 673 case 'a': 674 /* ASCII strings */ 675 ND_PRINT("\""); 676 if (nd_printn(ndo, bp, len, ndo->ndo_snapend)) { 677 ND_PRINT("\""); 678 goto trunc; 679 } 680 ND_PRINT("\""); 681 bp += len; 682 len = 0; 683 break; 684 685 case 'i': 686 case 'l': 687 case 'L': 688 /* ip addresses/32-bit words */ 689 while (len >= 4) { 690 if (!first) 691 ND_PRINT(","); 692 if (c == 'i') 693 ND_PRINT("%s", GET_IPADDR_STRING(bp)); 694 else if (c == 'L') 695 ND_PRINT("%d", GET_BE_S_4(bp)); 696 else 697 ND_PRINT("%u", GET_BE_U_4(bp)); 698 bp += 4; 699 len -= 4; 700 first = 0; 701 } 702 break; 703 704 case 'p': 705 /* IP address pairs */ 706 while (len >= 2*4) { 707 if (!first) 708 ND_PRINT(","); 709 ND_PRINT("(%s:", GET_IPADDR_STRING(bp)); 710 bp += 4; 711 len -= 4; 712 ND_PRINT("%s)", GET_IPADDR_STRING(bp)); 713 bp += 4; 714 len -= 4; 715 first = 0; 716 } 717 break; 718 719 case 's': 720 /* shorts */ 721 while (len >= 2) { 722 if (!first) 723 ND_PRINT(","); 724 ND_PRINT("%u", GET_BE_U_2(bp)); 725 bp += 2; 726 len -= 2; 727 first = 0; 728 } 729 break; 730 731 case 'B': 732 /* boolean */ 733 while (len > 0) { 734 uint8_t bool_value; 735 if (!first) 736 ND_PRINT(","); 737 bool_value = GET_U_1(bp); 738 switch (bool_value) { 739 case 0: 740 ND_PRINT("N"); 741 break; 742 case 1: 743 ND_PRINT("Y"); 744 break; 745 default: 746 ND_PRINT("%u?", bool_value); 747 break; 748 } 749 ++bp; 750 --len; 751 first = 0; 752 } 753 break; 754 755 case 'b': 756 case 'x': 757 default: 758 /* Bytes */ 759 while (len > 0) { 760 uint8_t byte_value; 761 if (!first) 762 ND_PRINT(c == 'x' ? ":" : "."); 763 byte_value = GET_U_1(bp); 764 if (c == 'x') 765 ND_PRINT("%02x", byte_value); 766 else 767 ND_PRINT("%u", byte_value); 768 ++bp; 769 --len; 770 first = 0; 771 } 772 break; 773 774 case '$': 775 /* Guys we can't handle with one of the usual cases */ 776 switch (tag) { 777 778 case TAG_NETBIOS_NODE: 779 /* this option should be at least 1 byte long */ 780 if (len < 1) { 781 ND_PRINT("[ERROR: length < 1 bytes]"); 782 break; 783 } 784 tag = GET_U_1(bp); 785 ++bp; 786 --len; 787 ND_PRINT("%s", tok2str(nbo2str, NULL, tag)); 788 break; 789 790 case TAG_OPT_OVERLOAD: 791 /* this option should be at least 1 byte long */ 792 if (len < 1) { 793 ND_PRINT("[ERROR: length < 1 bytes]"); 794 break; 795 } 796 tag = GET_U_1(bp); 797 ++bp; 798 --len; 799 ND_PRINT("%s", tok2str(oo2str, NULL, tag)); 800 break; 801 802 case TAG_CLIENT_FQDN: 803 /* this option should be at least 3 bytes long */ 804 if (len < 3) { 805 ND_PRINT("[ERROR: length < 3 bytes]"); 806 bp += len; 807 len = 0; 808 break; 809 } 810 if (GET_U_1(bp) & 0xf0) { 811 ND_PRINT("[ERROR: MBZ nibble 0x%x != 0] ", 812 (GET_U_1(bp) & 0xf0) >> 4); 813 } 814 if (GET_U_1(bp) & 0x0f) 815 ND_PRINT("[%s] ", 816 client_fqdn_flags(GET_U_1(bp))); 817 bp++; 818 if (GET_U_1(bp) || GET_U_1(bp + 1)) 819 ND_PRINT("%u/%u ", GET_U_1(bp), 820 GET_U_1(bp + 1)); 821 bp += 2; 822 ND_PRINT("\""); 823 if (nd_printn(ndo, bp, len - 3, ndo->ndo_snapend)) { 824 ND_PRINT("\""); 825 goto trunc; 826 } 827 ND_PRINT("\""); 828 bp += len - 3; 829 len = 0; 830 break; 831 832 case TAG_CLIENT_ID: 833 { 834 int type; 835 836 /* this option should be at least 1 byte long */ 837 if (len < 1) { 838 ND_PRINT("[ERROR: length < 1 bytes]"); 839 break; 840 } 841 type = GET_U_1(bp); 842 bp++; 843 len--; 844 if (type == 0) { 845 ND_PRINT("\""); 846 if (nd_printn(ndo, bp, len, ndo->ndo_snapend)) { 847 ND_PRINT("\""); 848 goto trunc; 849 } 850 ND_PRINT("\""); 851 bp += len; 852 len = 0; 853 break; 854 } else { 855 ND_PRINT("%s ", tok2str(arp2str, "hardware-type %u,", type)); 856 while (len > 0) { 857 if (!first) 858 ND_PRINT(":"); 859 ND_PRINT("%02x", GET_U_1(bp)); 860 ++bp; 861 --len; 862 first = 0; 863 } 864 } 865 break; 866 } 867 868 case TAG_AGENT_CIRCUIT: 869 while (len >= 2) { 870 subopt = GET_U_1(bp); 871 suboptlen = GET_U_1(bp + 1); 872 bp += 2; 873 len -= 2; 874 if (suboptlen > len) { 875 ND_PRINT("\n\t %s SubOption %u, length %u: length goes past end of option", 876 tok2str(agent_suboption_values, "Unknown", subopt), 877 subopt, 878 suboptlen); 879 bp += len; 880 len = 0; 881 break; 882 } 883 ND_PRINT("\n\t %s SubOption %u, length %u: ", 884 tok2str(agent_suboption_values, "Unknown", subopt), 885 subopt, 886 suboptlen); 887 switch (subopt) { 888 889 case AGENT_SUBOPTION_CIRCUIT_ID: /* fall through */ 890 case AGENT_SUBOPTION_REMOTE_ID: 891 case AGENT_SUBOPTION_SUBSCRIBER_ID: 892 if (nd_printn(ndo, bp, suboptlen, ndo->ndo_snapend)) 893 goto trunc; 894 break; 895 896 default: 897 print_unknown_data(ndo, bp, "\n\t\t", suboptlen); 898 } 899 900 len -= suboptlen; 901 bp += suboptlen; 902 } 903 break; 904 905 case TAG_CLASSLESS_STATIC_RT: 906 case TAG_CLASSLESS_STA_RT_MS: 907 { 908 u_int mask_width, significant_octets, i; 909 910 /* this option should be at least 5 bytes long */ 911 if (len < 5) { 912 ND_PRINT("[ERROR: length < 5 bytes]"); 913 bp += len; 914 len = 0; 915 break; 916 } 917 while (len > 0) { 918 if (!first) 919 ND_PRINT(","); 920 mask_width = GET_U_1(bp); 921 bp++; 922 len--; 923 /* mask_width <= 32 */ 924 if (mask_width > 32) { 925 ND_PRINT("[ERROR: Mask width (%u) > 32]", mask_width); 926 bp += len; 927 len = 0; 928 break; 929 } 930 significant_octets = (mask_width + 7) / 8; 931 /* significant octets + router(4) */ 932 if (len < significant_octets + 4) { 933 ND_PRINT("[ERROR: Remaining length (%u) < %u bytes]", len, significant_octets + 4); 934 bp += len; 935 len = 0; 936 break; 937 } 938 ND_PRINT("("); 939 if (mask_width == 0) 940 ND_PRINT("default"); 941 else { 942 for (i = 0; i < significant_octets ; i++) { 943 if (i > 0) 944 ND_PRINT("."); 945 ND_PRINT("%u", 946 GET_U_1(bp)); 947 bp++; 948 } 949 for (i = significant_octets ; i < 4 ; i++) 950 ND_PRINT(".0"); 951 ND_PRINT("/%u", mask_width); 952 } 953 ND_PRINT(":%s)", GET_IPADDR_STRING(bp)); 954 bp += 4; 955 len -= (significant_octets + 4); 956 first = 0; 957 } 958 break; 959 } 960 961 case TAG_USER_CLASS: 962 { 963 u_int suboptnumber = 1; 964 965 first = 1; 966 if (len < 2) { 967 ND_PRINT("[ERROR: length < 2 bytes]"); 968 bp += len; 969 len = 0; 970 break; 971 } 972 while (len > 0) { 973 suboptlen = GET_U_1(bp); 974 bp++; 975 len--; 976 ND_PRINT("\n\t "); 977 ND_PRINT("instance#%u: ", suboptnumber); 978 if (suboptlen == 0) { 979 ND_PRINT("[ERROR: suboption length must be non-zero]"); 980 bp += len; 981 len = 0; 982 break; 983 } 984 if (len < suboptlen) { 985 ND_PRINT("[ERROR: invalid option]"); 986 bp += len; 987 len = 0; 988 break; 989 } 990 ND_PRINT("\""); 991 if (nd_printn(ndo, bp, suboptlen, ndo->ndo_snapend)) { 992 ND_PRINT("\""); 993 goto trunc; 994 } 995 ND_PRINT("\""); 996 ND_PRINT(", length %u", suboptlen); 997 suboptnumber++; 998 len -= suboptlen; 999 bp += suboptlen; 1000 } 1001 break; 1002 } 1003 1004 1005 case TAG_SZTP_REDIRECT: 1006 /* as per https://datatracker.ietf.org/doc/html/rfc8572#section-8.3 1007 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-...-+-+-+-+-+-+-+ 1008 | uri-length | URI | 1009 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-...-+-+-+-+-+-+-+ 1010 1011 * uri-length: 2 octets long; specifies the length of the URI data. 1012 * URI: URI of the SZTP bootstrap server. 1013 */ 1014 while (len >= 2) { 1015 suboptlen = GET_BE_U_2(bp); 1016 bp += 2; 1017 len -= 2; 1018 ND_PRINT("\n\t "); 1019 ND_PRINT("length %u: ", suboptlen); 1020 if (len < suboptlen) { 1021 ND_PRINT("length goes past end of option"); 1022 bp += len; 1023 len = 0; 1024 break; 1025 } 1026 ND_PRINT("\""); 1027 nd_printjn(ndo, bp, suboptlen); 1028 ND_PRINT("\""); 1029 len -= suboptlen; 1030 bp += suboptlen; 1031 } 1032 if (len != 0) { 1033 ND_PRINT("[ERROR: length < 2 bytes]"); 1034 } 1035 break; 1036 1037 default: 1038 ND_PRINT("[unknown special tag %u, size %u]", 1039 tag, len); 1040 bp += len; 1041 len = 0; 1042 break; 1043 } 1044 break; 1045 } 1046 /* Data left over? */ 1047 if (len) { 1048 ND_PRINT("\n\t trailing data length %u", len); 1049 bp += len; 1050 } 1051 } 1052 return; 1053 trunc: 1054 nd_print_trunc(ndo); 1055 } 1056 1057 #define PRINTCMUADDR(m, s) { ND_TCHECK_4(cmu->m); \ 1058 if (GET_IPV4_TO_NETWORK_ORDER(cmu->m) != 0) \ 1059 ND_PRINT(" %s:%s", s, GET_IPADDR_STRING(cmu->m)); } 1060 1061 static void 1062 cmu_print(netdissect_options *ndo, 1063 const u_char *bp) 1064 { 1065 const struct cmu_vend *cmu; 1066 uint8_t v_flags; 1067 1068 ND_PRINT(" vend-cmu"); 1069 cmu = (const struct cmu_vend *)bp; 1070 1071 /* Only print if there are unknown bits */ 1072 ND_TCHECK_4(cmu->v_flags); 1073 v_flags = GET_U_1(cmu->v_flags); 1074 if ((v_flags & ~(VF_SMASK)) != 0) 1075 ND_PRINT(" F:0x%x", v_flags); 1076 PRINTCMUADDR(v_dgate, "DG"); 1077 PRINTCMUADDR(v_smask, v_flags & VF_SMASK ? "SM" : "SM*"); 1078 PRINTCMUADDR(v_dns1, "NS1"); 1079 PRINTCMUADDR(v_dns2, "NS2"); 1080 PRINTCMUADDR(v_ins1, "IEN1"); 1081 PRINTCMUADDR(v_ins2, "IEN2"); 1082 PRINTCMUADDR(v_ts1, "TS1"); 1083 PRINTCMUADDR(v_ts2, "TS2"); 1084 return; 1085 1086 trunc: 1087 nd_print_trunc(ndo); 1088 } 1089 1090 #undef PRINTCMUADDR 1091 1092 static char * 1093 client_fqdn_flags(u_int flags) 1094 { 1095 static char buf[8+1]; 1096 int i = 0; 1097 1098 if (flags & CLIENT_FQDN_FLAGS_S) 1099 buf[i++] = 'S'; 1100 if (flags & CLIENT_FQDN_FLAGS_O) 1101 buf[i++] = 'O'; 1102 if (flags & CLIENT_FQDN_FLAGS_E) 1103 buf[i++] = 'E'; 1104 if (flags & CLIENT_FQDN_FLAGS_N) 1105 buf[i++] = 'N'; 1106 buf[i] = '\0'; 1107 1108 return buf; 1109 } 1110