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 * support for the Cisco prop. VQP Protocol 16 * 17 * Original code by Carles Kishimoto <Carles.Kishimoto@bsc.es> 18 */ 19 20 #include <sys/cdefs.h> 21 #ifndef lint 22 #if 0 23 static const char rcsid[] _U_ = 24 "@(#) Header: /tcpdump/master/tcpdump/print-vqp.c,v 1.3 2006-08-19 06:51:13 guy Exp"; 25 #else 26 __RCSID("$NetBSD: print-vqp.c,v 1.2 2010/12/05 05:11:31 christos Exp $"); 27 #endif 28 #endif 29 30 #ifdef HAVE_CONFIG_H 31 #include "config.h" 32 #endif 33 34 #include <tcpdump-stdinc.h> 35 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 40 #include "interface.h" 41 #include "extract.h" 42 #include "addrtoname.h" 43 44 #define VQP_VERSION 1 45 #define VQP_EXTRACT_VERSION(x) ((x)&0xFF) 46 47 /* 48 * VQP common header 49 * 50 * 0 1 2 3 51 * 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 52 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 53 * | Constant | Packet type | Error Code | nitems | 54 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 55 * | Packet Sequence Number (4 bytes) | 56 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 57 */ 58 59 struct vqp_common_header_t { 60 u_int8_t version; 61 u_int8_t msg_type; 62 u_int8_t error_code; 63 u_int8_t nitems; 64 u_int8_t sequence[4]; 65 }; 66 67 struct vqp_obj_tlv_t { 68 u_int8_t obj_type[4]; 69 u_int8_t obj_length[2]; 70 }; 71 72 #define VQP_OBJ_REQ_JOIN_PORT 0x01 73 #define VQP_OBJ_RESP_VLAN 0x02 74 #define VQP_OBJ_REQ_RECONFIRM 0x03 75 #define VQP_OBJ_RESP_RECONFIRM 0x04 76 77 static const struct tok vqp_msg_type_values[] = { 78 { VQP_OBJ_REQ_JOIN_PORT, "Request, Join Port"}, 79 { VQP_OBJ_RESP_VLAN, "Response, VLAN"}, 80 { VQP_OBJ_REQ_RECONFIRM, "Request, Reconfirm"}, 81 { VQP_OBJ_RESP_RECONFIRM, "Response, Reconfirm"}, 82 { 0, NULL} 83 }; 84 85 static const struct tok vqp_error_code_values[] = { 86 { 0x00, "No error"}, 87 { 0x03, "Access denied"}, 88 { 0x04, "Shutdown port"}, 89 { 0x05, "Wrong VTP domain"}, 90 { 0, NULL} 91 }; 92 93 /* FIXME the heading 0x0c looks ugly - those must be flags etc. */ 94 #define VQP_OBJ_IP_ADDRESS 0x0c01 95 #define VQP_OBJ_PORT_NAME 0x0c02 96 #define VQP_OBJ_VLAN_NAME 0x0c03 97 #define VQP_OBJ_VTP_DOMAIN 0x0c04 98 #define VQP_OBJ_ETHERNET_PKT 0x0c05 99 #define VQP_OBJ_MAC_NULL 0x0c06 100 #define VQP_OBJ_MAC_ADDRESS 0x0c08 101 102 static const struct tok vqp_obj_values[] = { 103 { VQP_OBJ_IP_ADDRESS, "Client IP Address" }, 104 { VQP_OBJ_PORT_NAME, "Port Name" }, 105 { VQP_OBJ_VLAN_NAME, "VLAN Name" }, 106 { VQP_OBJ_VTP_DOMAIN, "VTP Domain" }, 107 { VQP_OBJ_ETHERNET_PKT, "Ethernet Packet" }, 108 { VQP_OBJ_MAC_NULL, "MAC Null" }, 109 { VQP_OBJ_MAC_ADDRESS, "MAC Address" }, 110 { 0, NULL} 111 }; 112 113 void 114 vqp_print(register const u_char *pptr, register u_int len) 115 { 116 const struct vqp_common_header_t *vqp_common_header; 117 const struct vqp_obj_tlv_t *vqp_obj_tlv; 118 119 const u_char *tptr; 120 u_int16_t vqp_obj_len; 121 u_int32_t vqp_obj_type; 122 int tlen; 123 u_int8_t nitems; 124 125 tptr=pptr; 126 tlen = len; 127 vqp_common_header = (const struct vqp_common_header_t *)pptr; 128 TCHECK(*vqp_common_header); 129 130 /* 131 * Sanity checking of the header. 132 */ 133 if (VQP_EXTRACT_VERSION(vqp_common_header->version) != VQP_VERSION) { 134 printf("VQP version %u packet not supported", 135 VQP_EXTRACT_VERSION(vqp_common_header->version)); 136 return; 137 } 138 139 /* in non-verbose mode just lets print the basic Message Type */ 140 if (vflag < 1) { 141 printf("VQPv%u %s Message, error-code %s (%u), length %u", 142 VQP_EXTRACT_VERSION(vqp_common_header->version), 143 tok2str(vqp_msg_type_values, "unknown (%u)",vqp_common_header->msg_type), 144 tok2str(vqp_error_code_values, "unknown (%u)",vqp_common_header->error_code), 145 vqp_common_header->error_code, 146 len); 147 return; 148 } 149 150 /* ok they seem to want to know everything - lets fully decode it */ 151 nitems = vqp_common_header->nitems; 152 printf("\n\tVQPv%u, %s Message, error-code %s (%u), seq 0x%08x, items %u, length %u", 153 VQP_EXTRACT_VERSION(vqp_common_header->version), 154 tok2str(vqp_msg_type_values, "unknown (%u)",vqp_common_header->msg_type), 155 tok2str(vqp_error_code_values, "unknown (%u)",vqp_common_header->error_code), 156 vqp_common_header->error_code, 157 EXTRACT_32BITS(&vqp_common_header->sequence), 158 nitems, 159 len); 160 161 /* skip VQP Common header */ 162 tptr+=sizeof(const struct vqp_common_header_t); 163 tlen-=sizeof(const struct vqp_common_header_t); 164 165 while (nitems > 0 && tlen > 0) { 166 167 vqp_obj_tlv = (const struct vqp_obj_tlv_t *)tptr; 168 vqp_obj_type = EXTRACT_32BITS(vqp_obj_tlv->obj_type); 169 vqp_obj_len = EXTRACT_16BITS(vqp_obj_tlv->obj_length); 170 tptr+=sizeof(struct vqp_obj_tlv_t); 171 tlen-=sizeof(struct vqp_obj_tlv_t); 172 173 printf("\n\t %s Object (0x%08x), length %u, value: ", 174 tok2str(vqp_obj_values, "Unknown", vqp_obj_type), 175 vqp_obj_type, vqp_obj_len); 176 177 /* basic sanity check */ 178 if (vqp_obj_type == 0 || vqp_obj_len ==0) { 179 return; 180 } 181 182 /* did we capture enough for fully decoding the object ? */ 183 if (!TTEST2(*tptr, vqp_obj_len)) 184 goto trunc; 185 186 switch(vqp_obj_type) { 187 case VQP_OBJ_IP_ADDRESS: 188 printf("%s (0x%08x)", ipaddr_string(tptr), EXTRACT_32BITS(tptr)); 189 break; 190 /* those objects have similar semantics - fall through */ 191 case VQP_OBJ_PORT_NAME: 192 case VQP_OBJ_VLAN_NAME: 193 case VQP_OBJ_VTP_DOMAIN: 194 case VQP_OBJ_ETHERNET_PKT: 195 safeputs((const char *)tptr, vqp_obj_len); 196 break; 197 /* those objects have similar semantics - fall through */ 198 case VQP_OBJ_MAC_ADDRESS: 199 case VQP_OBJ_MAC_NULL: 200 printf("%s", etheraddr_string(tptr)); 201 break; 202 default: 203 if (vflag <= 1) 204 print_unknown_data(tptr, "\n\t ", vqp_obj_len); 205 break; 206 } 207 tptr += vqp_obj_len; 208 tlen -= vqp_obj_len; 209 nitems--; 210 } 211 return; 212 trunc: 213 printf("\n\t[|VQP]"); 214 } 215