/* * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that: (1) source code distributions * retain the above copyright notice and this paragraph in its entirety, (2) * distributions including binary code include the above copyright notice and * this paragraph in its entirety in the documentation or other materials * provided with the distribution, and (3) all advertising materials mentioning * features or use of this software display the following acknowledgement: * ``This product includes software developed by the University of California, * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of * the University nor the names of its contributors may be used to endorse * or promote products derived from this software without specific prior * written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ /* \summary: BOOTP and IPv4 DHCP printer */ #include #ifndef lint __RCSID("$NetBSD: print-bootp.c,v 1.12 2024/09/02 16:15:30 christos Exp $"); #endif #include #include "netdissect-stdinc.h" #include #include "netdissect.h" #include "addrtoname.h" #include "extract.h" /* * Bootstrap Protocol (BOOTP). RFC951 and RFC1048. * * This file specifies the "implementation-independent" BOOTP protocol * information which is common to both client and server. * * Copyright 1988 by Carnegie Mellon. * * Permission to use, copy, modify, and distribute this program for any * purpose and without fee is hereby granted, provided that this copyright * and permission notice appear on all copies and supporting documentation, * the name of Carnegie Mellon not be used in advertising or publicity * pertaining to distribution of the program without specific prior * permission, and notice be given in supporting documentation that copying * and distribution is by permission of Carnegie Mellon and Stanford * University. Carnegie Mellon makes no representations about the * suitability of this software for any purpose. It is provided "as is" * without express or implied warranty. */ struct bootp { nd_uint8_t bp_op; /* packet opcode type */ nd_uint8_t bp_htype; /* hardware addr type */ nd_uint8_t bp_hlen; /* hardware addr length */ nd_uint8_t bp_hops; /* gateway hops */ nd_uint32_t bp_xid; /* transaction ID */ nd_uint16_t bp_secs; /* seconds since boot began */ nd_uint16_t bp_flags; /* flags - see bootp_flag_values[] in print-bootp.c */ nd_ipv4 bp_ciaddr; /* client IP address */ nd_ipv4 bp_yiaddr; /* 'your' IP address */ nd_ipv4 bp_siaddr; /* server IP address */ nd_ipv4 bp_giaddr; /* gateway IP address */ nd_byte bp_chaddr[16]; /* client hardware address */ nd_byte bp_sname[64]; /* server host name */ nd_byte bp_file[128]; /* boot file name */ nd_byte bp_vend[64]; /* vendor-specific area */ }; #define BOOTPREPLY 2 #define BOOTPREQUEST 1 /* * Vendor magic cookie (v_magic) for CMU */ #define VM_CMU "CMU" /* * Vendor magic cookie (v_magic) for RFC1048 */ #define VM_RFC1048 { 99, 130, 83, 99 } /* * RFC1048 tag values used to specify what information is being supplied in * the vendor field of the packet. */ #define TAG_PAD ((uint8_t) 0) #define TAG_SUBNET_MASK ((uint8_t) 1) #define TAG_TIME_OFFSET ((uint8_t) 2) #define TAG_GATEWAY ((uint8_t) 3) #define TAG_TIME_SERVER ((uint8_t) 4) #define TAG_NAME_SERVER ((uint8_t) 5) #define TAG_DOMAIN_SERVER ((uint8_t) 6) #define TAG_LOG_SERVER ((uint8_t) 7) #define TAG_COOKIE_SERVER ((uint8_t) 8) #define TAG_LPR_SERVER ((uint8_t) 9) #define TAG_IMPRESS_SERVER ((uint8_t) 10) #define TAG_RLP_SERVER ((uint8_t) 11) #define TAG_HOSTNAME ((uint8_t) 12) #define TAG_BOOTSIZE ((uint8_t) 13) #define TAG_END ((uint8_t) 255) /* RFC1497 tags */ #define TAG_DUMPPATH ((uint8_t) 14) #define TAG_DOMAINNAME ((uint8_t) 15) #define TAG_SWAP_SERVER ((uint8_t) 16) #define TAG_ROOTPATH ((uint8_t) 17) #define TAG_EXTPATH ((uint8_t) 18) /* RFC2132 */ #define TAG_IP_FORWARD ((uint8_t) 19) #define TAG_NL_SRCRT ((uint8_t) 20) #define TAG_PFILTERS ((uint8_t) 21) #define TAG_REASS_SIZE ((uint8_t) 22) #define TAG_DEF_TTL ((uint8_t) 23) #define TAG_MTU_TIMEOUT ((uint8_t) 24) #define TAG_MTU_TABLE ((uint8_t) 25) #define TAG_INT_MTU ((uint8_t) 26) #define TAG_LOCAL_SUBNETS ((uint8_t) 27) #define TAG_BROAD_ADDR ((uint8_t) 28) #define TAG_DO_MASK_DISC ((uint8_t) 29) #define TAG_SUPPLY_MASK ((uint8_t) 30) #define TAG_DO_RDISC ((uint8_t) 31) #define TAG_RTR_SOL_ADDR ((uint8_t) 32) #define TAG_STATIC_ROUTE ((uint8_t) 33) #define TAG_USE_TRAILERS ((uint8_t) 34) #define TAG_ARP_TIMEOUT ((uint8_t) 35) #define TAG_ETH_ENCAP ((uint8_t) 36) #define TAG_TCP_TTL ((uint8_t) 37) #define TAG_TCP_KEEPALIVE ((uint8_t) 38) #define TAG_KEEPALIVE_GO ((uint8_t) 39) #define TAG_NIS_DOMAIN ((uint8_t) 40) #define TAG_NIS_SERVERS ((uint8_t) 41) #define TAG_NTP_SERVERS ((uint8_t) 42) #define TAG_VENDOR_OPTS ((uint8_t) 43) #define TAG_NETBIOS_NS ((uint8_t) 44) #define TAG_NETBIOS_DDS ((uint8_t) 45) #define TAG_NETBIOS_NODE ((uint8_t) 46) #define TAG_NETBIOS_SCOPE ((uint8_t) 47) #define TAG_XWIN_FS ((uint8_t) 48) #define TAG_XWIN_DM ((uint8_t) 49) #define TAG_NIS_P_DOMAIN ((uint8_t) 64) #define TAG_NIS_P_SERVERS ((uint8_t) 65) #define TAG_MOBILE_HOME ((uint8_t) 68) #define TAG_SMTP_SERVER ((uint8_t) 69) #define TAG_POP3_SERVER ((uint8_t) 70) #define TAG_NNTP_SERVER ((uint8_t) 71) #define TAG_WWW_SERVER ((uint8_t) 72) #define TAG_FINGER_SERVER ((uint8_t) 73) #define TAG_IRC_SERVER ((uint8_t) 74) #define TAG_STREETTALK_SRVR ((uint8_t) 75) #define TAG_STREETTALK_STDA ((uint8_t) 76) /* DHCP options */ #define TAG_REQUESTED_IP ((uint8_t) 50) #define TAG_IP_LEASE ((uint8_t) 51) #define TAG_OPT_OVERLOAD ((uint8_t) 52) #define TAG_TFTP_SERVER ((uint8_t) 66) #define TAG_BOOTFILENAME ((uint8_t) 67) #define TAG_DHCP_MESSAGE ((uint8_t) 53) #define TAG_SERVER_ID ((uint8_t) 54) #define TAG_PARM_REQUEST ((uint8_t) 55) #define TAG_MESSAGE ((uint8_t) 56) #define TAG_MAX_MSG_SIZE ((uint8_t) 57) #define TAG_RENEWAL_TIME ((uint8_t) 58) #define TAG_REBIND_TIME ((uint8_t) 59) #define TAG_VENDOR_CLASS ((uint8_t) 60) #define TAG_CLIENT_ID ((uint8_t) 61) /* RFC 2241 */ #define TAG_NDS_SERVERS ((uint8_t) 85) #define TAG_NDS_TREE_NAME ((uint8_t) 86) #define TAG_NDS_CONTEXT ((uint8_t) 87) /* RFC 2242 */ #define TAG_NDS_IPDOMAIN ((uint8_t) 62) #define TAG_NDS_IPINFO ((uint8_t) 63) /* RFC 2485 */ #define TAG_OPEN_GROUP_UAP ((uint8_t) 98) /* RFC 2563 */ #define TAG_DISABLE_AUTOCONF ((uint8_t) 116) /* RFC 2610 */ #define TAG_SLP_DA ((uint8_t) 78) #define TAG_SLP_SCOPE ((uint8_t) 79) /* RFC 2937 */ #define TAG_NS_SEARCH ((uint8_t) 117) /* RFC 3004 - The User Class Option for DHCP */ #define TAG_USER_CLASS ((uint8_t) 77) /* RFC 3011 */ #define TAG_IP4_SUBNET_SELECT ((uint8_t) 118) /* RFC 3442 */ #define TAG_CLASSLESS_STATIC_RT ((uint8_t) 121) #define TAG_CLASSLESS_STA_RT_MS ((uint8_t) 249) /* RFC8572 */ #define TAG_SZTP_REDIRECT ((uint8_t) 143) /* RFC 5859 - TFTP Server Address Option for DHCPv4 */ #define TAG_TFTP_SERVER_ADDRESS ((uint8_t) 150) /* https://www.iana.org/assignments/bootp-dhcp-parameters/bootp-dhcp-parameters.xhtml */ #define TAG_SLP_NAMING_AUTH ((uint8_t) 80) #define TAG_CLIENT_FQDN ((uint8_t) 81) #define TAG_AGENT_CIRCUIT ((uint8_t) 82) #define TAG_AGENT_REMOTE ((uint8_t) 83) #define TAG_TZ_STRING ((uint8_t) 88) #define TAG_FQDN_OPTION ((uint8_t) 89) #define TAG_AUTH ((uint8_t) 90) #define TAG_CLIENT_LAST_TRANSACTION_TIME ((uint8_t) 91) #define TAG_ASSOCIATED_IP ((uint8_t) 92) #define TAG_CLIENT_ARCH ((uint8_t) 93) #define TAG_CLIENT_NDI ((uint8_t) 94) #define TAG_CLIENT_GUID ((uint8_t) 97) #define TAG_LDAP_URL ((uint8_t) 95) /* RFC 4833, TZ codes */ #define TAG_TZ_PCODE ((uint8_t) 100) #define TAG_TZ_TCODE ((uint8_t) 101) #define TAG_NETINFO_PARENT ((uint8_t) 112) #define TAG_NETINFO_PARENT_TAG ((uint8_t) 113) #define TAG_URL ((uint8_t) 114) #define TAG_MUDURL ((uint8_t) 161) /* DHCP Message types (values for TAG_DHCP_MESSAGE option) */ #define DHCPDISCOVER 1 #define DHCPOFFER 2 #define DHCPREQUEST 3 #define DHCPDECLINE 4 #define DHCPACK 5 #define DHCPNAK 6 #define DHCPRELEASE 7 #define DHCPINFORM 8 /* Defined in RFC4388 */ #define DHCPLEASEQUERY 10 #define DHCPLEASEUNASSIGNED 11 #define DHCPLEASEUNKNOWN 12 #define DHCPLEASEACTIVE 13 /* * "vendor" data permitted for CMU bootp clients. */ struct cmu_vend { nd_byte v_magic[4]; /* magic number */ nd_uint32_t v_flags; /* flags/opcodes, etc. */ nd_ipv4 v_smask; /* Subnet mask */ nd_ipv4 v_dgate; /* Default gateway */ nd_ipv4 v_dns1, v_dns2; /* Domain name servers */ nd_ipv4 v_ins1, v_ins2; /* IEN-116 name servers */ nd_ipv4 v_ts1, v_ts2; /* Time servers */ nd_byte v_unused[24]; /* currently unused */ }; /* v_flags values */ #define VF_SMASK 1 /* Subnet mask field contains valid data */ /* RFC 4702 DHCP Client FQDN Option */ #define CLIENT_FQDN_FLAGS_S 0x01 #define CLIENT_FQDN_FLAGS_O 0x02 #define CLIENT_FQDN_FLAGS_E 0x04 #define CLIENT_FQDN_FLAGS_N 0x08 /* end of original bootp.h */ static void rfc1048_print(netdissect_options *, const u_char *); static void cmu_print(netdissect_options *, const u_char *); static char *client_fqdn_flags(u_int flags); static const struct tok bootp_flag_values[] = { { 0x8000, "Broadcast" }, { 0, NULL} }; static const struct tok bootp_op_values[] = { { BOOTPREQUEST, "Request" }, { BOOTPREPLY, "Reply" }, { 0, NULL} }; /* * Print bootp requests */ void bootp_print(netdissect_options *ndo, const u_char *cp, u_int length) { const struct bootp *bp; static const u_char vm_cmu[4] = VM_CMU; static const u_char vm_rfc1048[4] = VM_RFC1048; uint8_t bp_op, bp_htype, bp_hlen; ndo->ndo_protocol = "bootp"; bp = (const struct bootp *)cp; bp_op = GET_U_1(bp->bp_op); ND_PRINT("BOOTP/DHCP, %s", tok2str(bootp_op_values, "unknown (0x%02x)", bp_op)); bp_htype = GET_U_1(bp->bp_htype); bp_hlen = GET_U_1(bp->bp_hlen); if (bp_htype == 1 && bp_hlen == MAC_ADDR_LEN && bp_op == BOOTPREQUEST) { ND_PRINT(" from %s", GET_ETHERADDR_STRING(bp->bp_chaddr)); } ND_PRINT(", length %u", length); if (!ndo->ndo_vflag) return; ND_TCHECK_2(bp->bp_secs); /* The usual hardware address type is 1 (10Mb Ethernet) */ if (bp_htype != 1) ND_PRINT(", htype %u", bp_htype); /* The usual length for 10Mb Ethernet address is 6 bytes */ if (bp_htype != 1 || bp_hlen != MAC_ADDR_LEN) ND_PRINT(", hlen %u", bp_hlen); /* Only print interesting fields */ if (GET_U_1(bp->bp_hops)) ND_PRINT(", hops %u", GET_U_1(bp->bp_hops)); if (GET_BE_U_4(bp->bp_xid)) ND_PRINT(", xid 0x%x", GET_BE_U_4(bp->bp_xid)); if (GET_BE_U_2(bp->bp_secs)) ND_PRINT(", secs %u", GET_BE_U_2(bp->bp_secs)); ND_PRINT(", Flags [%s]", bittok2str(bootp_flag_values, "none", GET_BE_U_2(bp->bp_flags))); if (ndo->ndo_vflag > 1) ND_PRINT(" (0x%04x)", GET_BE_U_2(bp->bp_flags)); /* Client's ip address */ if (GET_IPV4_TO_NETWORK_ORDER(bp->bp_ciaddr)) ND_PRINT("\n\t Client-IP %s", GET_IPADDR_STRING(bp->bp_ciaddr)); /* 'your' ip address (bootp client) */ if (GET_IPV4_TO_NETWORK_ORDER(bp->bp_yiaddr)) ND_PRINT("\n\t Your-IP %s", GET_IPADDR_STRING(bp->bp_yiaddr)); /* Server's ip address */ if (GET_IPV4_TO_NETWORK_ORDER(bp->bp_siaddr)) ND_PRINT("\n\t Server-IP %s", GET_IPADDR_STRING(bp->bp_siaddr)); /* Gateway's ip address */ if (GET_IPV4_TO_NETWORK_ORDER(bp->bp_giaddr)) ND_PRINT("\n\t Gateway-IP %s", GET_IPADDR_STRING(bp->bp_giaddr)); /* Client's Ethernet address */ if (bp_htype == 1 && bp_hlen == MAC_ADDR_LEN) { ND_PRINT("\n\t Client-Ethernet-Address %s", GET_ETHERADDR_STRING(bp->bp_chaddr)); } if (GET_U_1(bp->bp_sname)) { /* get first char only */ ND_PRINT("\n\t sname \""); if (nd_printztn(ndo, bp->bp_sname, (u_int)sizeof(bp->bp_sname), ndo->ndo_snapend) == 0) { ND_PRINT("\""); nd_print_trunc(ndo); return; } ND_PRINT("\""); } if (GET_U_1(bp->bp_file)) { /* get first char only */ ND_PRINT("\n\t file \""); if (nd_printztn(ndo, bp->bp_file, (u_int)sizeof(bp->bp_file), ndo->ndo_snapend) == 0) { ND_PRINT("\""); nd_print_trunc(ndo); return; } ND_PRINT("\""); } /* Decode the vendor buffer */ ND_TCHECK_4(bp->bp_vend); if (memcmp((const char *)bp->bp_vend, vm_rfc1048, sizeof(uint32_t)) == 0) rfc1048_print(ndo, bp->bp_vend); else if (memcmp((const char *)bp->bp_vend, vm_cmu, sizeof(uint32_t)) == 0) cmu_print(ndo, bp->bp_vend); else { uint32_t ul; ul = GET_BE_U_4(bp->bp_vend); if (ul != 0) ND_PRINT("\n\t Vendor-#0x%x", ul); } return; trunc: nd_print_trunc(ndo); } /* * The first character specifies the format to print: * i - ip address (32 bits) * p - ip address pairs (32 bits + 32 bits) * l - long (32 bits) * L - unsigned long (32 bits) * s - short (16 bits) * b - period-separated decimal bytes (variable length) * x - colon-separated hex bytes (variable length) * a - ASCII string (variable length) * B - on/off (8 bits) * $ - special (explicit code to handle) */ static const struct tok tag2str[] = { /* RFC1048 tags */ { TAG_PAD, " PAD" }, { TAG_SUBNET_MASK, "iSubnet-Mask" }, /* subnet mask (RFC950) */ { TAG_TIME_OFFSET, "LTime-Zone" }, /* seconds from UTC */ { TAG_GATEWAY, "iDefault-Gateway" }, /* default gateway */ { TAG_TIME_SERVER, "iTime-Server" }, /* time servers (RFC868) */ { TAG_NAME_SERVER, "iIEN-Name-Server" }, /* IEN name servers (IEN116) */ { TAG_DOMAIN_SERVER, "iDomain-Name-Server" }, /* domain name (RFC1035) */ { TAG_LOG_SERVER, "iLOG" }, /* MIT log servers */ { TAG_COOKIE_SERVER, "iCS" }, /* cookie servers (RFC865) */ { TAG_LPR_SERVER, "iLPR-Server" }, /* lpr server (RFC1179) */ { TAG_IMPRESS_SERVER, "iIM" }, /* impress servers (Imagen) */ { TAG_RLP_SERVER, "iRL" }, /* resource location (RFC887) */ { TAG_HOSTNAME, "aHostname" }, /* ASCII hostname */ { TAG_BOOTSIZE, "sBS" }, /* 512 byte blocks */ { TAG_END, " END" }, /* RFC1497 tags */ { TAG_DUMPPATH, "aDP" }, { TAG_DOMAINNAME, "aDomain-Name" }, { TAG_SWAP_SERVER, "iSS" }, { TAG_ROOTPATH, "aRP" }, { TAG_EXTPATH, "aEP" }, /* RFC2132 tags */ { TAG_IP_FORWARD, "BIPF" }, { TAG_NL_SRCRT, "BSRT" }, { TAG_PFILTERS, "pPF" }, { TAG_REASS_SIZE, "sRSZ" }, { TAG_DEF_TTL, "bTTL" }, { TAG_MTU_TIMEOUT, "lMTU-Timeout" }, { TAG_MTU_TABLE, "sMTU-Table" }, { TAG_INT_MTU, "sMTU" }, { TAG_LOCAL_SUBNETS, "BLSN" }, { TAG_BROAD_ADDR, "iBR" }, { TAG_DO_MASK_DISC, "BMD" }, { TAG_SUPPLY_MASK, "BMS" }, { TAG_DO_RDISC, "BRouter-Discovery" }, { TAG_RTR_SOL_ADDR, "iRSA" }, { TAG_STATIC_ROUTE, "pStatic-Route" }, { TAG_USE_TRAILERS, "BUT" }, { TAG_ARP_TIMEOUT, "lAT" }, { TAG_ETH_ENCAP, "BIE" }, { TAG_TCP_TTL, "bTT" }, { TAG_TCP_KEEPALIVE, "lKI" }, { TAG_KEEPALIVE_GO, "BKG" }, { TAG_NIS_DOMAIN, "aYD" }, { TAG_NIS_SERVERS, "iYS" }, { TAG_NTP_SERVERS, "iNTP" }, { TAG_VENDOR_OPTS, "bVendor-Option" }, { TAG_NETBIOS_NS, "iNetbios-Name-Server" }, { TAG_NETBIOS_DDS, "iWDD" }, { TAG_NETBIOS_NODE, "$Netbios-Node" }, { TAG_NETBIOS_SCOPE, "aNetbios-Scope" }, { TAG_XWIN_FS, "iXFS" }, { TAG_XWIN_DM, "iXDM" }, { TAG_NIS_P_DOMAIN, "sN+D" }, { TAG_NIS_P_SERVERS, "iN+S" }, { TAG_MOBILE_HOME, "iMH" }, { TAG_SMTP_SERVER, "iSMTP" }, { TAG_POP3_SERVER, "iPOP3" }, { TAG_NNTP_SERVER, "iNNTP" }, { TAG_WWW_SERVER, "iWWW" }, { TAG_FINGER_SERVER, "iFG" }, { TAG_IRC_SERVER, "iIRC" }, { TAG_STREETTALK_SRVR, "iSTS" }, { TAG_STREETTALK_STDA, "iSTDA" }, { TAG_REQUESTED_IP, "iRequested-IP" }, { TAG_IP_LEASE, "lLease-Time" }, { TAG_OPT_OVERLOAD, "$OO" }, { TAG_TFTP_SERVER, "aTFTP" }, { TAG_BOOTFILENAME, "aBF" }, { TAG_DHCP_MESSAGE, " DHCP-Message" }, { TAG_SERVER_ID, "iServer-ID" }, { TAG_PARM_REQUEST, "bParameter-Request" }, { TAG_MESSAGE, "aMSG" }, { TAG_MAX_MSG_SIZE, "sMSZ" }, { TAG_RENEWAL_TIME, "lRN" }, { TAG_REBIND_TIME, "lRB" }, { TAG_VENDOR_CLASS, "aVendor-Class" }, { TAG_CLIENT_ID, "$Client-ID" }, /* RFC 2485 */ { TAG_OPEN_GROUP_UAP, "aUAP" }, /* RFC 2563 */ { TAG_DISABLE_AUTOCONF, "BNOAUTO" }, /* RFC 2610 */ { TAG_SLP_DA, "bSLP-DA" }, /*"b" is a little wrong */ { TAG_SLP_SCOPE, "bSLP-SCOPE" }, /*"b" is a little wrong */ /* RFC 2937 */ { TAG_NS_SEARCH, "sNSSEARCH" }, /* XXX 's' */ /* RFC 3004 - The User Class Option for DHCP */ { TAG_USER_CLASS, "$User-Class" }, /* RFC 3011 */ { TAG_IP4_SUBNET_SELECT, "iSUBNET" }, /* RFC 3442 */ { TAG_CLASSLESS_STATIC_RT, "$Classless-Static-Route" }, { TAG_CLASSLESS_STA_RT_MS, "$Classless-Static-Route-Microsoft" }, /* RFC 8572 */ { TAG_SZTP_REDIRECT, "$SZTP-Redirect" }, /* RFC 5859 - TFTP Server Address Option for DHCPv4 */ { TAG_TFTP_SERVER_ADDRESS, "iTFTP-Server-Address" }, /* https://www.iana.org/assignments/bootp-dhcp-parameters/bootp-dhcp-parameters.xhtml#options */ { TAG_SLP_NAMING_AUTH, "aSLP-NA" }, { TAG_CLIENT_FQDN, "$FQDN" }, { TAG_AGENT_CIRCUIT, "$Agent-Information" }, { TAG_AGENT_REMOTE, "bARMT" }, { TAG_TZ_STRING, "aTZSTR" }, { TAG_FQDN_OPTION, "bFQDNS" }, /* XXX 'b' */ { TAG_AUTH, "bAUTH" }, /* XXX 'b' */ { TAG_CLIENT_LAST_TRANSACTION_TIME, "LLast-Transaction-Time" }, { TAG_ASSOCIATED_IP, "iAssociated-IP" }, { TAG_CLIENT_ARCH, "sARCH" }, { TAG_CLIENT_NDI, "bNDI" }, /* XXX 'b' */ { TAG_CLIENT_GUID, "bGUID" }, /* XXX 'b' */ { TAG_LDAP_URL, "aLDAP" }, { TAG_TZ_PCODE, "aPOSIX-TZ" }, { TAG_TZ_TCODE, "aTZ-Name" }, { TAG_NETINFO_PARENT, "iNI" }, { TAG_NETINFO_PARENT_TAG, "aNITAG" }, { TAG_URL, "aURL" }, { TAG_MUDURL, "aMUD-URL" }, { 0, NULL } }; /* DHCP "options overload" types */ static const struct tok oo2str[] = { { 1, "file" }, { 2, "sname" }, { 3, "file+sname" }, { 0, NULL } }; /* NETBIOS over TCP/IP node type options */ static const struct tok nbo2str[] = { { 0x1, "b-node" }, { 0x2, "p-node" }, { 0x4, "m-node" }, { 0x8, "h-node" }, { 0, NULL } }; /* ARP Hardware types, for Client-ID option */ static const struct tok arp2str[] = { { 0x1, "ether" }, { 0x6, "ieee802" }, { 0x7, "arcnet" }, { 0xf, "frelay" }, { 0x17, "strip" }, { 0x18, "ieee1394" }, { 0, NULL } }; static const struct tok dhcp_msg_values[] = { { DHCPDISCOVER, "Discover" }, { DHCPOFFER, "Offer" }, { DHCPREQUEST, "Request" }, { DHCPDECLINE, "Decline" }, { DHCPACK, "ACK" }, { DHCPNAK, "NACK" }, { DHCPRELEASE, "Release" }, { DHCPINFORM, "Inform" }, { DHCPLEASEQUERY, "LeaseQuery" }, { DHCPLEASEUNASSIGNED, "LeaseUnassigned" }, { DHCPLEASEUNKNOWN, "LeaseUnknown" }, { DHCPLEASEACTIVE, "LeaseActive" }, { 0, NULL } }; #define AGENT_SUBOPTION_CIRCUIT_ID 1 /* RFC 3046 */ #define AGENT_SUBOPTION_REMOTE_ID 2 /* RFC 3046 */ #define AGENT_SUBOPTION_SUBSCRIBER_ID 6 /* RFC 3993 */ static const struct tok agent_suboption_values[] = { { AGENT_SUBOPTION_CIRCUIT_ID, "Circuit-ID" }, { AGENT_SUBOPTION_REMOTE_ID, "Remote-ID" }, { AGENT_SUBOPTION_SUBSCRIBER_ID, "Subscriber-ID" }, { 0, NULL } }; static void rfc1048_print(netdissect_options *ndo, const u_char *bp) { uint16_t tag; u_int len; const char *cp; char c; int first, idx; uint8_t subopt, suboptlen; ND_PRINT("\n\t Vendor-rfc1048 Extensions"); /* Step over magic cookie */ ND_PRINT("\n\t Magic Cookie 0x%08x", GET_BE_U_4(bp)); bp += sizeof(int32_t); /* Loop while we there is a tag left in the buffer */ while (ND_TTEST_1(bp)) { tag = GET_U_1(bp); bp++; if (tag == TAG_PAD && ndo->ndo_vflag < 3) continue; if (tag == TAG_END && ndo->ndo_vflag < 3) return; cp = tok2str(tag2str, "?Unknown", tag); c = *cp++; if (tag == TAG_PAD || tag == TAG_END) len = 0; else { /* Get the length; check for truncation */ len = GET_U_1(bp); bp++; } ND_PRINT("\n\t %s (%u), length %u%s", cp, tag, len, len > 0 ? ": " : ""); if (tag == TAG_PAD && ndo->ndo_vflag > 2) { u_int ntag = 1; while (ND_TTEST_1(bp) && GET_U_1(bp) == TAG_PAD) { bp++; ntag++; } if (ntag > 1) ND_PRINT(", occurs %u", ntag); } ND_TCHECK_LEN(bp, len); if (tag == TAG_DHCP_MESSAGE && len == 1) { ND_PRINT("%s", tok2str(dhcp_msg_values, "Unknown (%u)", GET_U_1(bp))); bp++; continue; } if (tag == TAG_PARM_REQUEST) { idx = 0; while (len > 0) { uint8_t innertag = GET_U_1(bp); bp++; len--; cp = tok2str(tag2str, "?Unknown", innertag); if (idx % 4 == 0) ND_PRINT("\n\t "); else ND_PRINT(", "); ND_PRINT("%s (%u)", cp + 1, innertag); idx++; } continue; } /* Print data */ if (c == '?') { /* Base default formats for unknown tags on data size */ if (len & 1) c = 'b'; else if (len & 2) c = 's'; else c = 'l'; } first = 1; switch (c) { case 'a': /* ASCII strings */ ND_PRINT("\""); if (nd_printn(ndo, bp, len, ndo->ndo_snapend)) { ND_PRINT("\""); goto trunc; } ND_PRINT("\""); bp += len; len = 0; break; case 'i': case 'l': case 'L': /* ip addresses/32-bit words */ while (len >= 4) { if (!first) ND_PRINT(","); if (c == 'i') ND_PRINT("%s", GET_IPADDR_STRING(bp)); else if (c == 'L') ND_PRINT("%d", GET_BE_S_4(bp)); else ND_PRINT("%u", GET_BE_U_4(bp)); bp += 4; len -= 4; first = 0; } break; case 'p': /* IP address pairs */ while (len >= 2*4) { if (!first) ND_PRINT(","); ND_PRINT("(%s:", GET_IPADDR_STRING(bp)); bp += 4; len -= 4; ND_PRINT("%s)", GET_IPADDR_STRING(bp)); bp += 4; len -= 4; first = 0; } break; case 's': /* shorts */ while (len >= 2) { if (!first) ND_PRINT(","); ND_PRINT("%u", GET_BE_U_2(bp)); bp += 2; len -= 2; first = 0; } break; case 'B': /* boolean */ while (len > 0) { uint8_t bool_value; if (!first) ND_PRINT(","); bool_value = GET_U_1(bp); switch (bool_value) { case 0: ND_PRINT("N"); break; case 1: ND_PRINT("Y"); break; default: ND_PRINT("%u?", bool_value); break; } ++bp; --len; first = 0; } break; case 'b': case 'x': default: /* Bytes */ while (len > 0) { uint8_t byte_value; if (!first) ND_PRINT(c == 'x' ? ":" : "."); byte_value = GET_U_1(bp); if (c == 'x') ND_PRINT("%02x", byte_value); else ND_PRINT("%u", byte_value); ++bp; --len; first = 0; } break; case '$': /* Guys we can't handle with one of the usual cases */ switch (tag) { case TAG_NETBIOS_NODE: /* this option should be at least 1 byte long */ if (len < 1) { ND_PRINT("[ERROR: length < 1 bytes]"); break; } tag = GET_U_1(bp); ++bp; --len; ND_PRINT("%s", tok2str(nbo2str, NULL, tag)); break; case TAG_OPT_OVERLOAD: /* this option should be at least 1 byte long */ if (len < 1) { ND_PRINT("[ERROR: length < 1 bytes]"); break; } tag = GET_U_1(bp); ++bp; --len; ND_PRINT("%s", tok2str(oo2str, NULL, tag)); break; case TAG_CLIENT_FQDN: /* this option should be at least 3 bytes long */ if (len < 3) { ND_PRINT("[ERROR: length < 3 bytes]"); bp += len; len = 0; break; } if (GET_U_1(bp) & 0xf0) { ND_PRINT("[ERROR: MBZ nibble 0x%x != 0] ", (GET_U_1(bp) & 0xf0) >> 4); } if (GET_U_1(bp) & 0x0f) ND_PRINT("[%s] ", client_fqdn_flags(GET_U_1(bp))); bp++; if (GET_U_1(bp) || GET_U_1(bp + 1)) ND_PRINT("%u/%u ", GET_U_1(bp), GET_U_1(bp + 1)); bp += 2; ND_PRINT("\""); if (nd_printn(ndo, bp, len - 3, ndo->ndo_snapend)) { ND_PRINT("\""); goto trunc; } ND_PRINT("\""); bp += len - 3; len = 0; break; case TAG_CLIENT_ID: { int type; /* this option should be at least 1 byte long */ if (len < 1) { ND_PRINT("[ERROR: length < 1 bytes]"); break; } type = GET_U_1(bp); bp++; len--; if (type == 0) { ND_PRINT("\""); if (nd_printn(ndo, bp, len, ndo->ndo_snapend)) { ND_PRINT("\""); goto trunc; } ND_PRINT("\""); bp += len; len = 0; break; } else { ND_PRINT("%s ", tok2str(arp2str, "hardware-type %u,", type)); while (len > 0) { if (!first) ND_PRINT(":"); ND_PRINT("%02x", GET_U_1(bp)); ++bp; --len; first = 0; } } break; } case TAG_AGENT_CIRCUIT: while (len >= 2) { subopt = GET_U_1(bp); suboptlen = GET_U_1(bp + 1); bp += 2; len -= 2; if (suboptlen > len) { ND_PRINT("\n\t %s SubOption %u, length %u: length goes past end of option", tok2str(agent_suboption_values, "Unknown", subopt), subopt, suboptlen); bp += len; len = 0; break; } ND_PRINT("\n\t %s SubOption %u, length %u: ", tok2str(agent_suboption_values, "Unknown", subopt), subopt, suboptlen); switch (subopt) { case AGENT_SUBOPTION_CIRCUIT_ID: /* fall through */ case AGENT_SUBOPTION_REMOTE_ID: case AGENT_SUBOPTION_SUBSCRIBER_ID: if (nd_printn(ndo, bp, suboptlen, ndo->ndo_snapend)) goto trunc; break; default: print_unknown_data(ndo, bp, "\n\t\t", suboptlen); } len -= suboptlen; bp += suboptlen; } break; case TAG_CLASSLESS_STATIC_RT: case TAG_CLASSLESS_STA_RT_MS: { u_int mask_width, significant_octets, i; /* this option should be at least 5 bytes long */ if (len < 5) { ND_PRINT("[ERROR: length < 5 bytes]"); bp += len; len = 0; break; } while (len > 0) { if (!first) ND_PRINT(","); mask_width = GET_U_1(bp); bp++; len--; /* mask_width <= 32 */ if (mask_width > 32) { ND_PRINT("[ERROR: Mask width (%u) > 32]", mask_width); bp += len; len = 0; break; } significant_octets = (mask_width + 7) / 8; /* significant octets + router(4) */ if (len < significant_octets + 4) { ND_PRINT("[ERROR: Remaining length (%u) < %u bytes]", len, significant_octets + 4); bp += len; len = 0; break; } ND_PRINT("("); if (mask_width == 0) ND_PRINT("default"); else { for (i = 0; i < significant_octets ; i++) { if (i > 0) ND_PRINT("."); ND_PRINT("%u", GET_U_1(bp)); bp++; } for (i = significant_octets ; i < 4 ; i++) ND_PRINT(".0"); ND_PRINT("/%u", mask_width); } ND_PRINT(":%s)", GET_IPADDR_STRING(bp)); bp += 4; len -= (significant_octets + 4); first = 0; } break; } case TAG_USER_CLASS: { u_int suboptnumber = 1; first = 1; if (len < 2) { ND_PRINT("[ERROR: length < 2 bytes]"); bp += len; len = 0; break; } while (len > 0) { suboptlen = GET_U_1(bp); bp++; len--; ND_PRINT("\n\t "); ND_PRINT("instance#%u: ", suboptnumber); if (suboptlen == 0) { ND_PRINT("[ERROR: suboption length must be non-zero]"); bp += len; len = 0; break; } if (len < suboptlen) { ND_PRINT("[ERROR: invalid option]"); bp += len; len = 0; break; } ND_PRINT("\""); if (nd_printn(ndo, bp, suboptlen, ndo->ndo_snapend)) { ND_PRINT("\""); goto trunc; } ND_PRINT("\""); ND_PRINT(", length %u", suboptlen); suboptnumber++; len -= suboptlen; bp += suboptlen; } break; } case TAG_SZTP_REDIRECT: /* as per https://datatracker.ietf.org/doc/html/rfc8572#section-8.3 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-...-+-+-+-+-+-+-+ | uri-length | URI | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-...-+-+-+-+-+-+-+ * uri-length: 2 octets long; specifies the length of the URI data. * URI: URI of the SZTP bootstrap server. */ while (len >= 2) { suboptlen = GET_BE_U_2(bp); bp += 2; len -= 2; ND_PRINT("\n\t "); ND_PRINT("length %u: ", suboptlen); if (len < suboptlen) { ND_PRINT("length goes past end of option"); bp += len; len = 0; break; } ND_PRINT("\""); nd_printjn(ndo, bp, suboptlen); ND_PRINT("\""); len -= suboptlen; bp += suboptlen; } if (len != 0) { ND_PRINT("[ERROR: length < 2 bytes]"); } break; default: ND_PRINT("[unknown special tag %u, size %u]", tag, len); bp += len; len = 0; break; } break; } /* Data left over? */ if (len) { ND_PRINT("\n\t trailing data length %u", len); bp += len; } } return; trunc: nd_print_trunc(ndo); } #define PRINTCMUADDR(m, s) { ND_TCHECK_4(cmu->m); \ if (GET_IPV4_TO_NETWORK_ORDER(cmu->m) != 0) \ ND_PRINT(" %s:%s", s, GET_IPADDR_STRING(cmu->m)); } static void cmu_print(netdissect_options *ndo, const u_char *bp) { const struct cmu_vend *cmu; uint8_t v_flags; ND_PRINT(" vend-cmu"); cmu = (const struct cmu_vend *)bp; /* Only print if there are unknown bits */ ND_TCHECK_4(cmu->v_flags); v_flags = GET_U_1(cmu->v_flags); if ((v_flags & ~(VF_SMASK)) != 0) ND_PRINT(" F:0x%x", v_flags); PRINTCMUADDR(v_dgate, "DG"); PRINTCMUADDR(v_smask, v_flags & VF_SMASK ? "SM" : "SM*"); PRINTCMUADDR(v_dns1, "NS1"); PRINTCMUADDR(v_dns2, "NS2"); PRINTCMUADDR(v_ins1, "IEN1"); PRINTCMUADDR(v_ins2, "IEN2"); PRINTCMUADDR(v_ts1, "TS1"); PRINTCMUADDR(v_ts2, "TS2"); return; trunc: nd_print_trunc(ndo); } #undef PRINTCMUADDR static char * client_fqdn_flags(u_int flags) { static char buf[8+1]; int i = 0; if (flags & CLIENT_FQDN_FLAGS_S) buf[i++] = 'S'; if (flags & CLIENT_FQDN_FLAGS_O) buf[i++] = 'O'; if (flags & CLIENT_FQDN_FLAGS_E) buf[i++] = 'E'; if (flags & CLIENT_FQDN_FLAGS_N) buf[i++] = 'N'; buf[i] = '\0'; return buf; }