1 /* packet-nt-tpcp.c
2 * Routines for Transparent Proxy Cache Protocol packet disassembly
3 * (c) Copyright Giles Scott <giles.scott1 [AT] btinternet.com>
4 *
5 * Wireshark - Network traffic analyzer
6 * By Gerald Combs <gerald@wireshark.org>
7 * Copyright 1998 Gerald Combs
8 *
9 * SPDX-License-Identifier: GPL-2.0-or-later
10 */
11
12 #include "config.h"
13
14
15 #include <epan/packet.h>
16 #include <epan/addr_resolv.h> /* this is for get_hostname and udp_port_to_display */
17
18 void proto_register_tpcp(void);
19 void proto_reg_handoff_tpcp(void);
20
21 #define UDP_PORT_TPCP 3121 /* Not IANA registered */
22
23 /* TPCP version1/2 PDU format */
24 typedef struct _tpcppdu_t {
25 guint8 version; /* PDU version 1 */
26 guint8 type; /* PDU type: 1=request, 2=reply, 3=add filter, 4=rem filter */
27 /* Version 2 adds 5=add session 6= remove session */
28 guint16 flags; /* 0x0001: 0=UDP, 1=TCP*/
29 /* 0x0002: 0=NONE, 1=DONT_REDIRECT */
30 /* 0x0004: 0=NONE, 1=Xon */
31 /* 0x0008: 0=NONE, 1=Xoff */
32 guint16 id; /* request/response identification or TTL */
33 guint16 cport; /* client UDP or TCP port number */
34 guint32 caddr; /* client IPv4 address */
35 guint32 saddr; /* server IPV4 address */
36 /* tpcp version 2 only*/
37 guint32 vaddr; /* Virtual Server IPv4 address */
38 guint32 rasaddr; /* RAS server IPv4 address */
39 guint32 signature; /* 0x74706370 - tpcp */
40 } tpcpdu_t;
41
42
43 static const value_string type_vals[] = {
44 { 1, "Request" },
45 { 2, "Reply" },
46 { 3, "Add Filter" },
47 { 4, "Remove Filter" },
48 /* 5 and 6 are for version 2 only */
49 { 5, "Add Session" },
50 { 6, "Remove Session" },
51 { 0, NULL }
52 };
53
54 /* TPCP Flags */
55 #define TF_TPCP_UDPTCP 0x0001
56 #define TF_TPCP_DONTREDIRECT 0x0002
57 #define TF_TPCP_XON 0x0004
58 #define TF_TPCP_XOFF 0x0008
59
60
61 /* Version info */
62 #define TPCP_VER_1 1
63 #define TPCP_VER_2 2
64
65 #define TPCP_VER_1_LENGTH 16
66 #define TPCP_VER_2_LENGTH 28
67
68 /* things we can do filters on */
69 static int hf_tpcp_version = -1;
70 static int hf_tpcp_type = -1;
71 static int hf_tpcp_flags = -1;
72 static int hf_tpcp_flags_tcp = -1;
73 static int hf_tpcp_flags_redir = -1;
74 static int hf_tpcp_flags_xon = -1;
75 static int hf_tpcp_flags_xoff = -1;
76 static int hf_tpcp_id = -1;
77 static int hf_tpcp_cport = -1;
78 static int hf_tpcp_caddr = -1;
79 static int hf_tpcp_saddr = -1;
80 static int hf_tpcp_vaddr = -1;
81 static int hf_tpcp_rasaddr = -1;
82 static int hf_tpcp_signature = -1;
83
84 static int proto_tpcp = -1;
85
86 static gint ett_tpcp = -1;
87 static gint ett_tpcp_flags = -1;
88
89
90 static int
dissect_tpcp(tvbuff_t * tvb,packet_info * pinfo,proto_tree * tree,void * data _U_)91 dissect_tpcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
92 {
93 proto_tree *tpcp_tree = NULL;
94 proto_item *ti;
95 guint8 version, type;
96 guint16 id, cport;
97
98 static int * const tpcp_flags[] = {
99 &hf_tpcp_flags_tcp,
100 &hf_tpcp_flags_redir,
101 &hf_tpcp_flags_xon,
102 &hf_tpcp_flags_xoff,
103 NULL
104 };
105
106 col_set_str(pinfo->cinfo, COL_PROTOCOL, "TPCP");
107 col_clear(pinfo->cinfo, COL_INFO);
108
109 /* need to find out which version!! */
110 version = tvb_get_guint8(tvb, 0);
111 if ((version != TPCP_VER_1) && (version != TPCP_VER_2)) {
112 /* Not us */
113 return 0;
114 }
115
116 ti = proto_tree_add_protocol_format(tree, proto_tpcp, tvb, 0, -1,
117 "Alteon WebSystems - Transparent Proxy Cache Protocol");
118
119 tpcp_tree = proto_item_add_subtree(ti, ett_tpcp);
120
121 proto_tree_add_item(tpcp_tree, hf_tpcp_version, tvb, 0, 1, ENC_BIG_ENDIAN);
122 type = tvb_get_guint8(tvb, 1);
123 proto_tree_add_item(tpcp_tree, hf_tpcp_type, tvb, 1, 1, ENC_BIG_ENDIAN);
124
125 proto_tree_add_bitmask(tpcp_tree, tvb, 2, hf_tpcp_flags, ett_tpcp_flags, tpcp_flags, ENC_NA);
126
127 id = tvb_get_ntohs(tvb, 4);
128 proto_tree_add_item(tpcp_tree, hf_tpcp_id, tvb, 4, 2, ENC_BIG_ENDIAN);
129
130 cport = tvb_get_ntohs(tvb, 6);
131 proto_tree_add_uint_format_value(tpcp_tree, hf_tpcp_cport, tvb, 6, 2, cport,
132 "%s", udp_port_to_display(pinfo->pool, cport));
133
134 proto_tree_add_item(tpcp_tree, hf_tpcp_caddr, tvb, 8, 4, ENC_BIG_ENDIAN);
135 proto_tree_add_item(tpcp_tree, hf_tpcp_saddr, tvb, 12, 4, ENC_BIG_ENDIAN);
136
137 if (version == TPCP_VER_2) {
138 proto_tree_add_item(tpcp_tree, hf_tpcp_vaddr, tvb, 16, 4, ENC_BIG_ENDIAN);
139 proto_tree_add_item(tpcp_tree, hf_tpcp_rasaddr, tvb, 20, 4, ENC_BIG_ENDIAN);
140 proto_tree_add_item(tpcp_tree, hf_tpcp_signature, tvb, 24, 4, ENC_BIG_ENDIAN);
141 }
142
143 col_add_fstr(pinfo->cinfo, COL_INFO,"%s id %d CPort %s CIP %s SIP %s",
144 val_to_str_const(type, type_vals, "Unknown"),
145 id,
146 udp_port_to_display(pinfo->pool, cport),
147 tvb_ip_to_str(pinfo->pool, tvb, 8),
148 tvb_ip_to_str(pinfo->pool, tvb, 12));
149
150 if (version == TPCP_VER_1)
151 return TPCP_VER_1_LENGTH;
152
153 return TPCP_VER_2_LENGTH;
154 }
155
156 void
proto_register_tpcp(void)157 proto_register_tpcp(void)
158 {
159 static hf_register_info hf[] = {
160 { &hf_tpcp_version,
161 { "Version", "tpcp.version", FT_UINT8, BASE_DEC, NULL, 0x0,
162 "TPCP version", HFILL }},
163
164 { &hf_tpcp_type,
165 { "Type", "tpcp.type", FT_UINT8, BASE_DEC, VALS(type_vals), 0x0,
166 "PDU type", HFILL }},
167
168 { &hf_tpcp_flags,
169 { "Flags", "tpcp.flags", FT_UINT16, BASE_HEX, NULL, 0x0,
170 NULL, HFILL }},
171
172 { &hf_tpcp_flags_tcp,
173 { "UDP/TCP", "tpcp.flags.tcp", FT_BOOLEAN, 8, TFS(&tfs_set_notset), TF_TPCP_UDPTCP,
174 "Protocol type", HFILL }},
175
176 { &hf_tpcp_flags_redir,
177 { "No Redirect", "tpcp.flags.redir", FT_BOOLEAN, 8, TFS(&tfs_set_notset), TF_TPCP_DONTREDIRECT,
178 "Don't redirect client", HFILL }},
179
180 { &hf_tpcp_flags_xon,
181 { "XON", "tpcp.flags.xon", FT_BOOLEAN, 8, TFS(&tfs_set_notset), TF_TPCP_XON,
182 NULL, HFILL }},
183
184 { &hf_tpcp_flags_xoff,
185 { "XOFF", "tpcp.flags.xoff", FT_BOOLEAN, 8, TFS(&tfs_set_notset), TF_TPCP_XOFF,
186 NULL, HFILL }},
187
188 { &hf_tpcp_id,
189 { "Client indent", "tpcp.cid", FT_UINT16, BASE_DEC, NULL, 0x0,
190 NULL, HFILL }},
191
192 { &hf_tpcp_cport,
193 { "Client Source Port", "tpcp.cport", FT_UINT16, BASE_DEC, NULL, 0x0,
194 NULL, HFILL }},
195
196 { &hf_tpcp_caddr,
197 { "Client Source IP address", "tpcp.caddr", FT_IPv4, BASE_NONE, NULL, 0x0,
198 NULL, HFILL }},
199
200 { &hf_tpcp_saddr,
201 { "Server IP address", "tpcp.saddr", FT_IPv4, BASE_NONE, NULL, 0x0,
202 NULL, HFILL }},
203
204 { &hf_tpcp_vaddr,
205 { "Virtual Server IP address", "tpcp.vaddr", FT_IPv4, BASE_NONE, NULL, 0x0,
206 NULL, HFILL }},
207
208 { &hf_tpcp_rasaddr,
209 { "RAS server IP address", "tpcp.rasaddr", FT_IPv4, BASE_NONE, NULL, 0x0,
210 NULL, HFILL }},
211
212 { &hf_tpcp_signature,
213 { "Signature", "tpcp.signature", FT_UINT32, BASE_DEC, NULL, 0x0,
214 NULL, HFILL }},
215 };
216
217
218 static gint *ett[] = {
219 &ett_tpcp,
220 &ett_tpcp_flags,
221 };
222
223 proto_tpcp = proto_register_protocol("Alteon - Transparent Proxy Cache Protocol", "TPCP", "tpcp");
224 proto_register_field_array(proto_tpcp, hf, array_length(hf));
225 proto_register_subtree_array(ett, array_length(ett));
226 }
227
228 void
proto_reg_handoff_tpcp(void)229 proto_reg_handoff_tpcp(void)
230 {
231 dissector_handle_t tpcp_handle;
232
233 tpcp_handle = create_dissector_handle(dissect_tpcp, proto_tpcp);
234 dissector_add_uint_with_preference("udp.port", UDP_PORT_TPCP, tpcp_handle);
235 }
236
237 /*
238 * Editor modelines - https://www.wireshark.org/tools/modelines.html
239 *
240 * Local variables:
241 * c-basic-offset: 8
242 * tab-width: 8
243 * indent-tabs-mode: t
244 * End:
245 *
246 * vi: set shiftwidth=8 tabstop=8 noexpandtab:
247 * :indentSize=8:tabSize=8:noTabs=false:
248 */
249