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 #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
vqp_print(netdissect_options * ndo,register const u_char * pptr,register u_int len)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