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