1 /* 2 * Copyright (c) 1998-2006 The TCPDUMP project 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that: (1) source code 6 * distributions retain the above copyright notice and this paragraph 7 * in its entirety, and (2) distributions including binary code include 8 * the above copyright notice and this paragraph in its entirety in 9 * the documentation or other materials provided with the distribution. 10 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND 11 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT 12 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 13 * FOR A PARTICULAR PURPOSE. 14 * 15 * Original code by Carles Kishimoto <Carles.Kishimoto@bsc.es> 16 */ 17 18 /* \summary: Cisco VLAN Query Protocol (VQP) printer */ 19 20 #include <sys/cdefs.h> 21 #ifndef lint 22 __RCSID("$NetBSD: print-vqp.c,v 1.6 2017/02/05 04:05:05 spz Exp $"); 23 #endif 24 25 #ifdef HAVE_CONFIG_H 26 #include "config.h" 27 #endif 28 29 #include <netdissect-stdinc.h> 30 31 #include "netdissect.h" 32 #include "extract.h" 33 #include "addrtoname.h" 34 35 #define VQP_VERSION 1 36 #define VQP_EXTRACT_VERSION(x) ((x)&0xFF) 37 38 /* 39 * VQP common header 40 * 41 * 0 1 2 3 42 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 43 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 44 * | Constant | Packet type | Error Code | nitems | 45 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 46 * | Packet Sequence Number (4 bytes) | 47 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 48 */ 49 50 struct vqp_common_header_t { 51 uint8_t version; 52 uint8_t msg_type; 53 uint8_t error_code; 54 uint8_t nitems; 55 uint8_t sequence[4]; 56 }; 57 58 struct vqp_obj_tlv_t { 59 uint8_t obj_type[4]; 60 uint8_t obj_length[2]; 61 }; 62 63 #define VQP_OBJ_REQ_JOIN_PORT 0x01 64 #define VQP_OBJ_RESP_VLAN 0x02 65 #define VQP_OBJ_REQ_RECONFIRM 0x03 66 #define VQP_OBJ_RESP_RECONFIRM 0x04 67 68 static const struct tok vqp_msg_type_values[] = { 69 { VQP_OBJ_REQ_JOIN_PORT, "Request, Join Port"}, 70 { VQP_OBJ_RESP_VLAN, "Response, VLAN"}, 71 { VQP_OBJ_REQ_RECONFIRM, "Request, Reconfirm"}, 72 { VQP_OBJ_RESP_RECONFIRM, "Response, Reconfirm"}, 73 { 0, NULL} 74 }; 75 76 static const struct tok vqp_error_code_values[] = { 77 { 0x00, "No error"}, 78 { 0x03, "Access denied"}, 79 { 0x04, "Shutdown port"}, 80 { 0x05, "Wrong VTP domain"}, 81 { 0, NULL} 82 }; 83 84 /* FIXME the heading 0x0c looks ugly - those must be flags etc. */ 85 #define VQP_OBJ_IP_ADDRESS 0x0c01 86 #define VQP_OBJ_PORT_NAME 0x0c02 87 #define VQP_OBJ_VLAN_NAME 0x0c03 88 #define VQP_OBJ_VTP_DOMAIN 0x0c04 89 #define VQP_OBJ_ETHERNET_PKT 0x0c05 90 #define VQP_OBJ_MAC_NULL 0x0c06 91 #define VQP_OBJ_MAC_ADDRESS 0x0c08 92 93 static const struct tok vqp_obj_values[] = { 94 { VQP_OBJ_IP_ADDRESS, "Client IP Address" }, 95 { VQP_OBJ_PORT_NAME, "Port Name" }, 96 { VQP_OBJ_VLAN_NAME, "VLAN Name" }, 97 { VQP_OBJ_VTP_DOMAIN, "VTP Domain" }, 98 { VQP_OBJ_ETHERNET_PKT, "Ethernet Packet" }, 99 { VQP_OBJ_MAC_NULL, "MAC Null" }, 100 { VQP_OBJ_MAC_ADDRESS, "MAC Address" }, 101 { 0, NULL} 102 }; 103 104 void 105 vqp_print(netdissect_options *ndo, register const u_char *pptr, register u_int len) 106 { 107 const struct vqp_common_header_t *vqp_common_header; 108 const struct vqp_obj_tlv_t *vqp_obj_tlv; 109 110 const u_char *tptr; 111 uint16_t vqp_obj_len; 112 uint32_t vqp_obj_type; 113 int tlen; 114 uint8_t nitems; 115 116 tptr=pptr; 117 tlen = len; 118 vqp_common_header = (const struct vqp_common_header_t *)pptr; 119 ND_TCHECK(*vqp_common_header); 120 121 /* 122 * Sanity checking of the header. 123 */ 124 if (VQP_EXTRACT_VERSION(vqp_common_header->version) != VQP_VERSION) { 125 ND_PRINT((ndo, "VQP version %u packet not supported", 126 VQP_EXTRACT_VERSION(vqp_common_header->version))); 127 return; 128 } 129 130 /* in non-verbose mode just lets print the basic Message Type */ 131 if (ndo->ndo_vflag < 1) { 132 ND_PRINT((ndo, "VQPv%u %s Message, error-code %s (%u), length %u", 133 VQP_EXTRACT_VERSION(vqp_common_header->version), 134 tok2str(vqp_msg_type_values, "unknown (%u)",vqp_common_header->msg_type), 135 tok2str(vqp_error_code_values, "unknown (%u)",vqp_common_header->error_code), 136 vqp_common_header->error_code, 137 len)); 138 return; 139 } 140 141 /* ok they seem to want to know everything - lets fully decode it */ 142 nitems = vqp_common_header->nitems; 143 ND_PRINT((ndo, "\n\tVQPv%u, %s Message, error-code %s (%u), seq 0x%08x, items %u, length %u", 144 VQP_EXTRACT_VERSION(vqp_common_header->version), 145 tok2str(vqp_msg_type_values, "unknown (%u)",vqp_common_header->msg_type), 146 tok2str(vqp_error_code_values, "unknown (%u)",vqp_common_header->error_code), 147 vqp_common_header->error_code, 148 EXTRACT_32BITS(&vqp_common_header->sequence), 149 nitems, 150 len)); 151 152 /* skip VQP Common header */ 153 tptr+=sizeof(const struct vqp_common_header_t); 154 tlen-=sizeof(const struct vqp_common_header_t); 155 156 while (nitems > 0 && tlen > 0) { 157 158 vqp_obj_tlv = (const struct vqp_obj_tlv_t *)tptr; 159 vqp_obj_type = EXTRACT_32BITS(vqp_obj_tlv->obj_type); 160 vqp_obj_len = EXTRACT_16BITS(vqp_obj_tlv->obj_length); 161 tptr+=sizeof(struct vqp_obj_tlv_t); 162 tlen-=sizeof(struct vqp_obj_tlv_t); 163 164 ND_PRINT((ndo, "\n\t %s Object (0x%08x), length %u, value: ", 165 tok2str(vqp_obj_values, "Unknown", vqp_obj_type), 166 vqp_obj_type, vqp_obj_len)); 167 168 /* basic sanity check */ 169 if (vqp_obj_type == 0 || vqp_obj_len ==0) { 170 return; 171 } 172 173 /* did we capture enough for fully decoding the object ? */ 174 ND_TCHECK2(*tptr, vqp_obj_len); 175 176 switch(vqp_obj_type) { 177 case VQP_OBJ_IP_ADDRESS: 178 ND_PRINT((ndo, "%s (0x%08x)", ipaddr_string(ndo, tptr), EXTRACT_32BITS(tptr))); 179 break; 180 /* those objects have similar semantics - fall through */ 181 case VQP_OBJ_PORT_NAME: 182 case VQP_OBJ_VLAN_NAME: 183 case VQP_OBJ_VTP_DOMAIN: 184 case VQP_OBJ_ETHERNET_PKT: 185 safeputs(ndo, tptr, vqp_obj_len); 186 break; 187 /* those objects have similar semantics - fall through */ 188 case VQP_OBJ_MAC_ADDRESS: 189 case VQP_OBJ_MAC_NULL: 190 ND_PRINT((ndo, "%s", etheraddr_string(ndo, tptr))); 191 break; 192 default: 193 if (ndo->ndo_vflag <= 1) 194 print_unknown_data(ndo,tptr, "\n\t ", vqp_obj_len); 195 break; 196 } 197 tptr += vqp_obj_len; 198 tlen -= vqp_obj_len; 199 nitems--; 200 } 201 return; 202 trunc: 203 ND_PRINT((ndo, "\n\t[|VQP]")); 204 } 205