2 * Routines for git packet dissection
4 * Copyright 2010, Jelmer Vernooij <jelmer@samba.org>
8 * Wireshark - Network traffic analyzer
9 * By Gerald Combs <gerald@wireshark.org>
10 * Copyright 1998 Gerald Combs
12 * Copied from packet-pop.c
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version 2
17 * of the License, or (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
37 #include <epan/packet.h>
38 #include <epan/strutil.h>
39 #include <epan/prefs.h>
40 #include "packet-tcp.h"
42 static int proto_git = -1;
44 static gint ett_git = -1;
46 static gint hf_git_packet_len = -1;
47 static gint hf_git_packet_data = -1;
48 static gint hf_git_packet_terminator = -1;
50 #define TCP_PORT_GIT 9418
52 /* desegmentation of Git over TCP */
53 static gboolean git_desegment = TRUE;
55 static gboolean tvb_get_packet_length(tvbuff_t *tvb, int offset,
60 lenstr = tvb_get_ephemeral_string(tvb, offset, 4);
62 return (sscanf(lenstr, "%hx", length) == 1);
66 get_git_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
70 if (!tvb_get_packet_length(tvb, offset, &plen))
71 return 0; /* No idea what this is */
74 /* Terminator packet */
82 dissect_git_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
89 col_set_str(pinfo->cinfo, COL_PROTOCOL, "GIT");
91 col_set_str(pinfo->cinfo, COL_INFO, "Git Smart Protocol");
93 ti = proto_tree_add_item(tree, proto_git, tvb, offset, -1, FALSE);
94 git_tree = proto_item_add_subtree(ti, ett_git);
96 if (!tvb_get_packet_length(tvb, 0, &plen))
100 proto_tree_add_uint(git_tree, hf_git_packet_terminator, tvb, offset,
107 proto_tree_add_uint(git_tree, hf_git_packet_len, tvb, offset,
110 proto_tree_add_item(git_tree, hf_git_packet_data, tvb, offset+4,
116 dissect_git(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
118 tcp_dissect_pdus(tvb, pinfo, tree, git_desegment, 4, get_git_pdu_len,
123 proto_register_git(void)
125 static hf_register_info hf[] = {
126 { &hf_git_packet_len,
127 { "Packet length", "git.length", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL },
129 { &hf_git_packet_data,
130 { "Packet data", "git.data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL },
132 { &hf_git_packet_terminator,
133 { "Terminator packet", "git.terminator", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL },
137 static gint *ett[] = {
141 module_t *git_module;
142 proto_git = proto_register_protocol("Git Smart Protocol", "GIT", "git");
143 register_dissector("git", dissect_git, proto_git);
144 proto_register_field_array(proto_git, hf, array_length(hf));
145 proto_register_subtree_array(ett, array_length(ett));
147 git_module = prefs_register_protocol(proto_git, NULL);
149 prefs_register_bool_preference(git_module, "desegment",
150 "Reassemble GIT messages spanning multiple TCP segments",
151 "Whether the GIT dissector should reassemble messages spanning multiple TCP segments."
152 " To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
157 proto_reg_handoff_git(void)
159 dissector_handle_t git_handle;
161 git_handle = find_dissector("git");
162 dissector_add_uint("tcp.port", TCP_PORT_GIT, git_handle);