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 (at) bsc.es> 16 */ 17 18 /* \summary: Cisco VLAN Query Protocol (VQP) printer */ 19 20 #ifdef HAVE_CONFIG_H 21 #include "config.h" 22 #endif 23 24 #include <netdissect-stdinc.h> 25 26 #include "netdissect.h" 27 #include "extract.h" 28 #include "addrtoname.h" 29 30 #define VQP_VERSION 1 31 #define VQP_EXTRACT_VERSION(x) ((x)&0xFF) 32 33 /* 34 * VQP common header 35 * 36 * 0 1 2 3 37 * 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 38 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 39 * | Constant | Packet type | Error Code | nitems | 40 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 41 * | Packet Sequence Number (4 bytes) | 42 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 43 */ 44 45 struct vqp_common_header_t { 46 uint8_t version; 47 uint8_t msg_type; 48 uint8_t error_code; 49 uint8_t nitems; 50 uint8_t sequence[4]; 51 }; 52 53 struct vqp_obj_tlv_t { 54 uint8_t obj_type[4]; 55 uint8_t obj_length[2]; 56 }; 57 58 #define VQP_OBJ_REQ_JOIN_PORT 0x01 59 #define VQP_OBJ_RESP_VLAN 0x02 60 #define VQP_OBJ_REQ_RECONFIRM 0x03 61 #define VQP_OBJ_RESP_RECONFIRM 0x04 62 63 static const struct tok vqp_msg_type_values[] = { 64 { VQP_OBJ_REQ_JOIN_PORT, "Request, Join Port"}, 65 { VQP_OBJ_RESP_VLAN, "Response, VLAN"}, 66 { VQP_OBJ_REQ_RECONFIRM, "Request, Reconfirm"}, 67 { VQP_OBJ_RESP_RECONFIRM, "Response, Reconfirm"}, 68 { 0, NULL} 69 }; 70 71 static const struct tok vqp_error_code_values[] = { 72 { 0x00, "No error"}, 73 { 0x03, "Access denied"}, 74 { 0x04, "Shutdown port"}, 75 { 0x05, "Wrong VTP domain"}, 76 { 0, NULL} 77 }; 78 79 /* FIXME the heading 0x0c looks ugly - those must be flags etc. */ 80 #define VQP_OBJ_IP_ADDRESS 0x0c01 81 #define VQP_OBJ_PORT_NAME 0x0c02 82 #define VQP_OBJ_VLAN_NAME 0x0c03 83 #define VQP_OBJ_VTP_DOMAIN 0x0c04 84 #define VQP_OBJ_ETHERNET_PKT 0x0c05 85 #define VQP_OBJ_MAC_NULL 0x0c06 86 #define VQP_OBJ_MAC_ADDRESS 0x0c08 87 88 static const struct tok vqp_obj_values[] = { 89 { VQP_OBJ_IP_ADDRESS, "Client IP Address" }, 90 { VQP_OBJ_PORT_NAME, "Port Name" }, 91 { VQP_OBJ_VLAN_NAME, "VLAN Name" }, 92 { VQP_OBJ_VTP_DOMAIN, "VTP Domain" }, 93 { VQP_OBJ_ETHERNET_PKT, "Ethernet Packet" }, 94 { VQP_OBJ_MAC_NULL, "MAC Null" }, 95 { VQP_OBJ_MAC_ADDRESS, "MAC Address" }, 96 { 0, NULL} 97 }; 98 99 void 100 vqp_print(netdissect_options *ndo, register const u_char *pptr, register u_int len) 101 { 102 const struct vqp_common_header_t *vqp_common_header; 103 const struct vqp_obj_tlv_t *vqp_obj_tlv; 104 105 const u_char *tptr; 106 uint16_t vqp_obj_len; 107 uint32_t vqp_obj_type; 108 int tlen; 109 uint8_t nitems; 110 111 tptr=pptr; 112 tlen = len; 113 vqp_common_header = (const struct vqp_common_header_t *)pptr; 114 ND_TCHECK(*vqp_common_header); 115 116 /* 117 * Sanity checking of the header. 118 */ 119 if (VQP_EXTRACT_VERSION(vqp_common_header->version) != VQP_VERSION) { 120 ND_PRINT((ndo, "VQP version %u packet not supported", 121 VQP_EXTRACT_VERSION(vqp_common_header->version))); 122 return; 123 } 124 125 /* in non-verbose mode just lets print the basic Message Type */ 126 if (ndo->ndo_vflag < 1) { 127 ND_PRINT((ndo, "VQPv%u %s Message, error-code %s (%u), length %u", 128 VQP_EXTRACT_VERSION(vqp_common_header->version), 129 tok2str(vqp_msg_type_values, "unknown (%u)",vqp_common_header->msg_type), 130 tok2str(vqp_error_code_values, "unknown (%u)",vqp_common_header->error_code), 131 vqp_common_header->error_code, 132 len)); 133 return; 134 } 135 136 /* ok they seem to want to know everything - lets fully decode it */ 137 nitems = vqp_common_header->nitems; 138 ND_PRINT((ndo, "\n\tVQPv%u, %s Message, error-code %s (%u), seq 0x%08x, items %u, length %u", 139 VQP_EXTRACT_VERSION(vqp_common_header->version), 140 tok2str(vqp_msg_type_values, "unknown (%u)",vqp_common_header->msg_type), 141 tok2str(vqp_error_code_values, "unknown (%u)",vqp_common_header->error_code), 142 vqp_common_header->error_code, 143 EXTRACT_32BITS(&vqp_common_header->sequence), 144 nitems, 145 len)); 146 147 /* skip VQP Common header */ 148 tptr+=sizeof(const struct vqp_common_header_t); 149 tlen-=sizeof(const struct vqp_common_header_t); 150 151 while (nitems > 0 && tlen > 0) { 152 153 vqp_obj_tlv = (const struct vqp_obj_tlv_t *)tptr; 154 vqp_obj_type = EXTRACT_32BITS(vqp_obj_tlv->obj_type); 155 vqp_obj_len = EXTRACT_16BITS(vqp_obj_tlv->obj_length); 156 tptr+=sizeof(struct vqp_obj_tlv_t); 157 tlen-=sizeof(struct vqp_obj_tlv_t); 158 159 ND_PRINT((ndo, "\n\t %s Object (0x%08x), length %u, value: ", 160 tok2str(vqp_obj_values, "Unknown", vqp_obj_type), 161 vqp_obj_type, vqp_obj_len)); 162 163 /* basic sanity check */ 164 if (vqp_obj_type == 0 || vqp_obj_len ==0) { 165 return; 166 } 167 168 /* did we capture enough for fully decoding the object ? */ 169 ND_TCHECK2(*tptr, vqp_obj_len); 170 171 switch(vqp_obj_type) { 172 case VQP_OBJ_IP_ADDRESS: 173 ND_PRINT((ndo, "%s (0x%08x)", ipaddr_string(ndo, tptr), EXTRACT_32BITS(tptr))); 174 break; 175 /* those objects have similar semantics - fall through */ 176 case VQP_OBJ_PORT_NAME: 177 case VQP_OBJ_VLAN_NAME: 178 case VQP_OBJ_VTP_DOMAIN: 179 case VQP_OBJ_ETHERNET_PKT: 180 safeputs(ndo, tptr, vqp_obj_len); 181 break; 182 /* those objects have similar semantics - fall through */ 183 case VQP_OBJ_MAC_ADDRESS: 184 case VQP_OBJ_MAC_NULL: 185 ND_PRINT((ndo, "%s", etheraddr_string(ndo, tptr))); 186 break; 187 default: 188 if (ndo->ndo_vflag <= 1) 189 print_unknown_data(ndo,tptr, "\n\t ", vqp_obj_len); 190 break; 191 } 192 tptr += vqp_obj_len; 193 tlen -= vqp_obj_len; 194 nitems--; 195 } 196 return; 197 trunc: 198 ND_PRINT((ndo, "\n\t[|VQP]")); 199 } 200
