/* * Copyright (c) 1998-2006 The TCPDUMP project * * 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, and (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. * 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. * * Original code by Carles Kishimoto */ /* \summary: Cisco VLAN Query Protocol (VQP) printer */ #ifdef HAVE_CONFIG_H #include #endif #include "netdissect-stdinc.h" #define ND_LONGJMP_FROM_TCHECK #include "netdissect.h" #include "extract.h" #include "addrtoname.h" #define VQP_VERSION 1 /* * VQP common header * * 0 1 2 3 * 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 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Constant | Packet type | Error Code | nitems | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Packet Sequence Number (4 bytes) | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ struct vqp_common_header_t { nd_uint8_t version; nd_uint8_t msg_type; nd_uint8_t error_code; nd_uint8_t nitems; nd_uint32_t sequence; }; struct vqp_obj_tlv_t { nd_uint32_t obj_type; nd_uint16_t obj_length; }; #define VQP_OBJ_REQ_JOIN_PORT 0x01 #define VQP_OBJ_RESP_VLAN 0x02 #define VQP_OBJ_REQ_RECONFIRM 0x03 #define VQP_OBJ_RESP_RECONFIRM 0x04 static const struct tok vqp_msg_type_values[] = { { VQP_OBJ_REQ_JOIN_PORT, "Request, Join Port"}, { VQP_OBJ_RESP_VLAN, "Response, VLAN"}, { VQP_OBJ_REQ_RECONFIRM, "Request, Reconfirm"}, { VQP_OBJ_RESP_RECONFIRM, "Response, Reconfirm"}, { 0, NULL} }; static const struct tok vqp_error_code_values[] = { { 0x00, "No error"}, { 0x03, "Access denied"}, { 0x04, "Shutdown port"}, { 0x05, "Wrong VTP domain"}, { 0, NULL} }; /* FIXME the heading 0x0c looks ugly - those must be flags etc. */ #define VQP_OBJ_IP_ADDRESS 0x0c01 #define VQP_OBJ_PORT_NAME 0x0c02 #define VQP_OBJ_VLAN_NAME 0x0c03 #define VQP_OBJ_VTP_DOMAIN 0x0c04 #define VQP_OBJ_ETHERNET_PKT 0x0c05 #define VQP_OBJ_MAC_NULL 0x0c06 #define VQP_OBJ_MAC_ADDRESS 0x0c08 static const struct tok vqp_obj_values[] = { { VQP_OBJ_IP_ADDRESS, "Client IP Address" }, { VQP_OBJ_PORT_NAME, "Port Name" }, { VQP_OBJ_VLAN_NAME, "VLAN Name" }, { VQP_OBJ_VTP_DOMAIN, "VTP Domain" }, { VQP_OBJ_ETHERNET_PKT, "Ethernet Packet" }, { VQP_OBJ_MAC_NULL, "MAC Null" }, { VQP_OBJ_MAC_ADDRESS, "MAC Address" }, { 0, NULL} }; void vqp_print(netdissect_options *ndo, const u_char *pptr, u_int len) { const struct vqp_common_header_t *vqp_common_header; const struct vqp_obj_tlv_t *vqp_obj_tlv; const u_char *tptr; uint8_t version; uint16_t vqp_obj_len; uint32_t vqp_obj_type; u_int tlen; uint8_t nitems; ndo->ndo_protocol = "vqp"; tptr=pptr; tlen = len; vqp_common_header = (const struct vqp_common_header_t *)pptr; ND_TCHECK_SIZE(vqp_common_header); if (sizeof(struct vqp_common_header_t) > tlen) goto invalid; version = GET_U_1(vqp_common_header->version); /* * Sanity checking of the header. */ if (version != VQP_VERSION) { ND_PRINT("VQP version %u packet not supported", version); return; } /* in non-verbose mode just lets print the basic Message Type */ if (ndo->ndo_vflag < 1) { ND_PRINT("VQPv%u %s Message, error-code %s (%u), length %u", version, tok2str(vqp_msg_type_values, "unknown (%u)",GET_U_1(vqp_common_header->msg_type)), tok2str(vqp_error_code_values, "unknown", GET_U_1(vqp_common_header->error_code)), GET_U_1(vqp_common_header->error_code), len); return; } /* ok they seem to want to know everything - lets fully decode it */ nitems = GET_U_1(vqp_common_header->nitems); ND_PRINT("\n\tVQPv%u, %s Message, error-code %s (%u), seq 0x%08x, items %u, length %u", version, tok2str(vqp_msg_type_values, "unknown (%u)",GET_U_1(vqp_common_header->msg_type)), tok2str(vqp_error_code_values, "unknown", GET_U_1(vqp_common_header->error_code)), GET_U_1(vqp_common_header->error_code), GET_BE_U_4(vqp_common_header->sequence), nitems, len); /* skip VQP Common header */ tptr+=sizeof(struct vqp_common_header_t); tlen-=sizeof(struct vqp_common_header_t); while (nitems != 0 && tlen != 0) { vqp_obj_tlv = (const struct vqp_obj_tlv_t *)tptr; ND_TCHECK_SIZE(vqp_obj_tlv); if (sizeof(struct vqp_obj_tlv_t) > tlen) goto invalid; vqp_obj_type = GET_BE_U_4(vqp_obj_tlv->obj_type); vqp_obj_len = GET_BE_U_2(vqp_obj_tlv->obj_length); tptr+=sizeof(struct vqp_obj_tlv_t); tlen-=sizeof(struct vqp_obj_tlv_t); ND_PRINT("\n\t %s Object (0x%08x), length %u, value: ", tok2str(vqp_obj_values, "Unknown", vqp_obj_type), vqp_obj_type, vqp_obj_len); /* basic sanity check */ if (vqp_obj_type == 0 || vqp_obj_len ==0) { return; } /* did we capture enough for fully decoding the object ? */ ND_TCHECK_LEN(tptr, vqp_obj_len); if (vqp_obj_len > tlen) goto invalid; switch(vqp_obj_type) { case VQP_OBJ_IP_ADDRESS: if (vqp_obj_len != 4) goto invalid; ND_PRINT("%s (0x%08x)", GET_IPADDR_STRING(tptr), GET_BE_U_4(tptr)); break; /* those objects have similar semantics - fall through */ case VQP_OBJ_PORT_NAME: case VQP_OBJ_VLAN_NAME: case VQP_OBJ_VTP_DOMAIN: case VQP_OBJ_ETHERNET_PKT: nd_printjnp(ndo, tptr, vqp_obj_len); break; /* those objects have similar semantics - fall through */ case VQP_OBJ_MAC_ADDRESS: case VQP_OBJ_MAC_NULL: if (vqp_obj_len != MAC_ADDR_LEN) goto invalid; ND_PRINT("%s", GET_ETHERADDR_STRING(tptr)); break; default: if (ndo->ndo_vflag <= 1) print_unknown_data(ndo,tptr, "\n\t ", vqp_obj_len); break; } tptr += vqp_obj_len; tlen -= vqp_obj_len; nitems--; } return; invalid: nd_print_invalid(ndo); }