1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
/* Routines for sipfrag packet disassembly (RFC 3420)
*
* Martin Mathieson
* Based on packet-sdp.c
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
/*
* Doesn't do a detailed dissection of the lines of the message, just treat as text.
*/
void proto_register_sipfrag(void);
/* Initialize the protocol and registered fields. */
static int proto_sipfrag;
static int hf_sipfrag_line;
/* Protocol subtree. */
static int ett_sipfrag;
void proto_reg_handoff_sipfrag(void);
static dissector_handle_t sipfrag_handle;
/* Main dissection function. */
static int dissect_sipfrag(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_tree *sipfrag_tree;
proto_item *ti;
int offset = 0;
int next_offset;
int linelen;
char *string;
int lines = 0;
/* Append this protocol name rather than replace. */
col_append_str(pinfo->cinfo, COL_PROTOCOL, "/sipfrag");
/* Add mention of this protocol to info column */
col_append_str(pinfo->cinfo, COL_INFO, ", with Sipfrag");
/* Create sipfrag tree. */
ti = proto_tree_add_item(tree, proto_sipfrag, tvb, offset, -1, ENC_NA);
sipfrag_tree = proto_item_add_subtree(ti, ett_sipfrag);
/* Show the sipfrag message a line at a time. */
while (tvb_offset_exists(tvb, offset))
{
/* Find the end of the line. */
linelen = tvb_find_line_end_unquoted(tvb, offset, -1, &next_offset);
/* For now, add all lines as unparsed strings */
/* Extract & add the string. */
string = (char*)tvb_get_string_enc(pinfo->pool, tvb, offset, linelen, ENC_ASCII);
proto_tree_add_string_format(sipfrag_tree, hf_sipfrag_line,
tvb, offset,
linelen, string,
"%s", string);
lines++;
/* Show first line in info column */
if (lines == 1) {
col_append_fstr(pinfo->cinfo, COL_INFO, "(%s", string);
}
/* Move onto next line. */
offset = next_offset;
}
/* Close off summary of sipfrag in info column */
col_append_str(pinfo->cinfo, COL_INFO, (lines > 1) ? "...)" : ")");
return tvb_captured_length(tvb);
}
void proto_register_sipfrag(void)
{
static hf_register_info hf[] =
{
{ &hf_sipfrag_line,
{ "Line",
"sipfrag.line",FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL
}
},
};
static int *ett[] =
{
&ett_sipfrag
};
/* Register protocol. */
proto_sipfrag = proto_register_protocol("Sipfrag", "SIPFRAG", "sipfrag");
proto_register_field_array(proto_sipfrag, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
/* Allow other dissectors to find this one by name. */
sipfrag_handle = register_dissector("sipfrag", dissect_sipfrag, proto_sipfrag);
}
void proto_reg_handoff_sipfrag(void)
{
dissector_add_string("media_type", "message/sipfrag", sipfrag_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
|
