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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
35 #include <epan/packet.h>
36 #include <epan/strutil.h>
37 #include <epan/prefs.h>
38 #include "packet-tcp.h"
40 static int proto_git = -1;
42 static gint ett_git = -1;
44 static gint hf_git_packet_len = -1;
45 static gint hf_git_packet_data = -1;
46 static gint hf_git_packet_terminator = -1;
48 #define TCP_PORT_GIT 9418
50 /* desegmentation of Git over TCP */
51 static gboolean git_desegment = TRUE;
53 static gboolean tvb_get_packet_length(tvbuff_t *tvb, int offset,
58 lenstr = tvb_get_string(wmem_packet_scope(), tvb, offset, 4);
60 return (sscanf(lenstr, "%hx", length) == 1);
64 get_git_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
68 if (!tvb_get_packet_length(tvb, offset, &plen))
69 return 0; /* No idea what this is */
72 /* Terminator packet */
80 dissect_git_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
87 col_set_str(pinfo->cinfo, COL_PROTOCOL, "GIT");
89 col_set_str(pinfo->cinfo, COL_INFO, "Git Smart Protocol");
91 ti = proto_tree_add_item(tree, proto_git, tvb, offset, -1, ENC_NA);
92 git_tree = proto_item_add_subtree(ti, ett_git);
94 if (!tvb_get_packet_length(tvb, 0, &plen))
98 proto_tree_add_uint(git_tree, hf_git_packet_terminator, tvb, offset,
105 proto_tree_add_uint(git_tree, hf_git_packet_len, tvb, offset,
108 proto_tree_add_item(git_tree, hf_git_packet_data, tvb, offset+4,
114 dissect_git(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
116 tcp_dissect_pdus(tvb, pinfo, tree, git_desegment, 4, get_git_pdu_len,
121 proto_register_git(void)
123 static hf_register_info hf[] = {
124 { &hf_git_packet_len,
125 { "Packet length", "git.length", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL },
127 { &hf_git_packet_data,
128 { "Packet data", "git.data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL },
130 { &hf_git_packet_terminator,
131 { "Terminator packet", "git.terminator", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL },
135 static gint *ett[] = {
139 module_t *git_module;
140 proto_git = proto_register_protocol("Git Smart Protocol", "GIT", "git");
141 register_dissector("git", dissect_git, proto_git);
142 proto_register_field_array(proto_git, hf, array_length(hf));
143 proto_register_subtree_array(ett, array_length(ett));
145 git_module = prefs_register_protocol(proto_git, NULL);
147 prefs_register_bool_preference(git_module, "desegment",
148 "Reassemble GIT messages spanning multiple TCP segments",
149 "Whether the GIT dissector should reassemble messages spanning multiple TCP segments."
150 " To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
155 proto_reg_handoff_git(void)
157 dissector_handle_t git_handle;
159 git_handle = find_dissector("git");
160 dissector_add_uint("tcp.port", TCP_PORT_GIT, git_handle);