2 * Routines for git packet dissection
4 * Copyright 2010, Jelmer Vernooij <jelmer@samba.org>
6 * Wireshark - Network traffic analyzer
7 * By Gerald Combs <gerald@wireshark.org>
8 * Copyright 1998 Gerald Combs
10 * Copied from packet-pop.c
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
31 #include <epan/packet.h>
32 #include <epan/prefs.h>
33 #include "packet-tcp.h"
35 void proto_register_git(void);
36 void proto_reg_handoff_git(void);
38 static dissector_handle_t git_handle;
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 get_packet_length(tvbuff_t *tvb, int offset,
58 lenstr = tvb_get_string_enc(wmem_packet_scope(), tvb, offset, 4, ENC_ASCII);
60 return (sscanf(lenstr, "%hx", length) == 1);
64 get_git_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
68 if (!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, void* data _U_)
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 (!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,
112 return tvb_length(tvb);
116 dissect_git(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
118 tcp_dissect_pdus(tvb, pinfo, tree, git_desegment, 4, get_git_pdu_len,
119 dissect_git_pdu, data);
120 return tvb_length(tvb);
124 proto_register_git(void)
126 static hf_register_info hf[] = {
127 { &hf_git_packet_len,
128 { "Packet length", "git.length", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL },
130 { &hf_git_packet_data,
131 { "Packet data", "git.data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL },
133 { &hf_git_packet_terminator,
134 { "Terminator packet", "git.terminator", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL },
138 static gint *ett[] = {
142 module_t *git_module;
144 proto_git = proto_register_protocol("Git Smart Protocol", "GIT", "git");
145 proto_register_field_array(proto_git, hf, array_length(hf));
146 proto_register_subtree_array(ett, array_length(ett));
148 git_handle = new_register_dissector("git", dissect_git, proto_git);
150 git_module = prefs_register_protocol(proto_git, NULL);
152 prefs_register_bool_preference(git_module, "desegment",
153 "Reassemble GIT messages spanning multiple TCP segments",
154 "Whether the GIT dissector should reassemble messages spanning multiple TCP segments."
155 " To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
160 proto_reg_handoff_git(void)
162 dissector_add_uint("tcp.port", TCP_PORT_GIT, git_handle);
166 * Editor modelines - http://www.wireshark.org/tools/modelines.html
171 * indent-tabs-mode: nil
174 * ex: set shiftwidth=2 tabstop=8 expandtab:
175 * :indentSize=2:tabSize=8:noTabs=true: