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 #ifdef HAVE_CONFIG_H 21 #include <config.h> 22 #endif 23 24 #include "netdissect-stdinc.h" 25 26 #define ND_LONGJMP_FROM_TCHECK 27 #include "netdissect.h" 28 #include "extract.h" 29 #include "addrtoname.h" 30 31 #define VQP_VERSION 1 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 nd_uint8_t version; 47 nd_uint8_t msg_type; 48 nd_uint8_t error_code; 49 nd_uint8_t nitems; 50 nd_uint32_t sequence; 51 }; 52 53 struct vqp_obj_tlv_t { 54 nd_uint32_t obj_type; 55 nd_uint16_t obj_length; 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, const u_char *pptr, 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 uint8_t version; 107 uint16_t vqp_obj_len; 108 uint32_t vqp_obj_type; 109 u_int tlen; 110 uint8_t nitems; 111 112 ndo->ndo_protocol = "vqp"; 113 tptr=pptr; 114 tlen = len; 115 vqp_common_header = (const struct vqp_common_header_t *)pptr; 116 ND_TCHECK_SIZE(vqp_common_header); 117 if (sizeof(struct vqp_common_header_t) > tlen) 118 goto invalid; 119 version = GET_U_1(vqp_common_header->version); 120 121 /* 122 * Sanity checking of the header. 123 */ 124 if (version != VQP_VERSION) { 125 ND_PRINT("VQP version %u packet not supported", 126 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("VQPv%u %s Message, error-code %s (%u), length %u", 133 version, 134 tok2str(vqp_msg_type_values, "unknown (%u)",GET_U_1(vqp_common_header->msg_type)), 135 tok2str(vqp_error_code_values, "unknown", GET_U_1(vqp_common_header->error_code)), 136 GET_U_1(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 = GET_U_1(vqp_common_header->nitems); 143 ND_PRINT("\n\tVQPv%u, %s Message, error-code %s (%u), seq 0x%08x, items %u, length %u", 144 version, 145 tok2str(vqp_msg_type_values, "unknown (%u)",GET_U_1(vqp_common_header->msg_type)), 146 tok2str(vqp_error_code_values, "unknown", GET_U_1(vqp_common_header->error_code)), 147 GET_U_1(vqp_common_header->error_code), 148 GET_BE_U_4(vqp_common_header->sequence), 149 nitems, 150 len); 151 152 /* skip VQP Common header */ 153 tptr+=sizeof(struct vqp_common_header_t); 154 tlen-=sizeof(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 ND_TCHECK_SIZE(vqp_obj_tlv); 160 if (sizeof(struct vqp_obj_tlv_t) > tlen) 161 goto invalid; 162 vqp_obj_type = GET_BE_U_4(vqp_obj_tlv->obj_type); 163 vqp_obj_len = GET_BE_U_2(vqp_obj_tlv->obj_length); 164 tptr+=sizeof(struct vqp_obj_tlv_t); 165 tlen-=sizeof(struct vqp_obj_tlv_t); 166 167 ND_PRINT("\n\t %s Object (0x%08x), length %u, value: ", 168 tok2str(vqp_obj_values, "Unknown", vqp_obj_type), 169 vqp_obj_type, vqp_obj_len); 170 171 /* basic sanity check */ 172 if (vqp_obj_type == 0 || vqp_obj_len ==0) { 173 return; 174 } 175 176 /* did we capture enough for fully decoding the object ? */ 177 ND_TCHECK_LEN(tptr, vqp_obj_len); 178 if (vqp_obj_len > tlen) 179 goto invalid; 180 181 switch(vqp_obj_type) { 182 case VQP_OBJ_IP_ADDRESS: 183 if (vqp_obj_len != 4) 184 goto invalid; 185 ND_PRINT("%s (0x%08x)", GET_IPADDR_STRING(tptr), 186 GET_BE_U_4(tptr)); 187 break; 188 /* those objects have similar semantics - fall through */ 189 case VQP_OBJ_PORT_NAME: 190 case VQP_OBJ_VLAN_NAME: 191 case VQP_OBJ_VTP_DOMAIN: 192 case VQP_OBJ_ETHERNET_PKT: 193 nd_printjnp(ndo, tptr, vqp_obj_len); 194 break; 195 /* those objects have similar semantics - fall through */ 196 case VQP_OBJ_MAC_ADDRESS: 197 case VQP_OBJ_MAC_NULL: 198 if (vqp_obj_len != MAC_ADDR_LEN) 199 goto invalid; 200 ND_PRINT("%s", GET_ETHERADDR_STRING(tptr)); 201 break; 202 default: 203 if (ndo->ndo_vflag <= 1) 204 print_unknown_data(ndo,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 invalid: 213 nd_print_invalid(ndo); 214 } 215