| /* |
| * 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 <Carles.Kishimoto@bsc.es> |
| */ |
| |
| /* \summary: Cisco VLAN Query Protocol (VQP) printer */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include <config.h> |
| #endif |
| |
| #include "netdissect-stdinc.h" |
| |
| #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; |
| |
| 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 trunc; |
| version = EXTRACT_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)",EXTRACT_U_1(vqp_common_header->msg_type)), |
| tok2str(vqp_error_code_values, "unknown (%u)",EXTRACT_U_1(vqp_common_header->error_code)), |
| EXTRACT_U_1(vqp_common_header->error_code), |
| len); |
| return; |
| } |
| |
| /* ok they seem to want to know everything - lets fully decode it */ |
| nitems = EXTRACT_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)",EXTRACT_U_1(vqp_common_header->msg_type)), |
| tok2str(vqp_error_code_values, "unknown (%u)",EXTRACT_U_1(vqp_common_header->error_code)), |
| EXTRACT_U_1(vqp_common_header->error_code), |
| EXTRACT_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 trunc; |
| vqp_obj_type = EXTRACT_BE_U_4(vqp_obj_tlv->obj_type); |
| vqp_obj_len = EXTRACT_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 trunc; |
| |
| switch(vqp_obj_type) { |
| case VQP_OBJ_IP_ADDRESS: |
| if (vqp_obj_len != 4) |
| goto trunc; |
| ND_PRINT("%s (0x%08x)", ipaddr_string(ndo, tptr), EXTRACT_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: |
| safeputs(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 trunc; |
| ND_PRINT("%s", etheraddr_string(ndo, 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; |
| trunc: |
| ND_PRINT("\n\t[|VQP]"); |
| } |
