forked from osmocom/wireshark
b01d3d77dc
svn path=/trunk/; revision=26586
358 lines
11 KiB
C
358 lines
11 KiB
C
/* packet-rsync.c
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* Routines for rsync dissection
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* [ very rough, but mininally functional ]
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* Copyright 2003, Brad Hards <bradh@frogmouth.net>
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/strutil.h>
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#include <epan/conversation.h>
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#include <epan/prefs.h>
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/* what states make sense here ? */
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typedef enum _rsync_state {
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RSYNC_INIT = 0,
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RSYNC_SERV_INIT = 1,
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RSYNC_CLIENT_QUERY = 2,
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RSYNC_SERV_RESPONSE = 4,
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RSYNC_COMMAND = 5,
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RSYNC_SERV_MOTD = 6,
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RSYNC_DATA = 7
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} rsync_state_t;
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static gboolean rsync_desegment = TRUE;
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/* this is a guide to the current conversation state */
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struct rsync_conversation_data {
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rsync_state_t state;
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};
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struct rsync_frame_data {
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rsync_state_t state;
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};
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static int proto_rsync = -1;
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static int hf_rsync_hdr_magic = -1;
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static int hf_rsync_hdr_version = -1;
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static int hf_rsync_query_string = -1;
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static int hf_rsync_motd_string = -1;
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static int hf_rsync_response_string = -1;
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static int hf_rsync_rsyncdok_string = -1;
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static int hf_rsync_command_string = -1;
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static int hf_rsync_data = -1;
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static gint ett_rsync = -1;
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static dissector_handle_t rsync_handle;
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#define TCP_PORT_RSYNC 873
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static guint glb_rsync_tcp_port = TCP_PORT_RSYNC;
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/* Packet dissection routine called by tcp (& udp) when port 873 detected */
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static void
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dissect_rsync_encap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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gboolean desegment _U_)
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{
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conversation_t *conversation;
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struct rsync_conversation_data *conversation_data;
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struct rsync_frame_data *frame_data;
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proto_item *ti;
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proto_tree *rsync_tree;
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int offset = 0;
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gchar version[5];
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gchar auth_string[10];
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guint buff_length;
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gchar magic_string[14];
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gchar *version_out;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "RSYNC");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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conversation = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst, pinfo->ptype,
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pinfo->srcport, pinfo->destport, 0);
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if (conversation == NULL) {
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conversation = conversation_new(pinfo->fd->num, &pinfo->src, &pinfo->dst,
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pinfo->ptype, pinfo->srcport,
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pinfo->destport, 0);
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}
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conversation_data = conversation_get_proto_data(conversation, proto_rsync);
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if (conversation_data == NULL) {
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conversation_data = g_malloc(sizeof(struct rsync_conversation_data));
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conversation_data->state = RSYNC_INIT;
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conversation_add_proto_data(conversation, proto_rsync, conversation_data);
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}
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conversation_set_dissector(conversation, rsync_handle);
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ti = proto_tree_add_item(tree, proto_rsync, tvb, 0, -1, FALSE);
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rsync_tree = proto_item_add_subtree(ti, ett_rsync);
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frame_data = p_get_proto_data(pinfo->fd, proto_rsync);
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if (!frame_data) {
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/* then we haven't seen this frame before */
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frame_data = g_malloc(sizeof(struct rsync_frame_data));
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frame_data->state = conversation_data->state;
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p_add_proto_data(pinfo->fd, proto_rsync, frame_data);
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}
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switch (frame_data->state) {
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case RSYNC_INIT:
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proto_tree_add_item(rsync_tree, hf_rsync_hdr_magic, tvb, offset, 8, TRUE);
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offset += 8;
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proto_tree_add_item(rsync_tree, hf_rsync_hdr_version, tvb, offset, 4, TRUE);
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tvb_get_nstringz0(tvb, offset, sizeof(version), version);
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offset += 4;
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if (check_col(pinfo->cinfo, COL_INFO)) {
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/* XXX - is this really a string? */
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version_out = format_text(version, 4);
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col_append_fstr(pinfo->cinfo, COL_INFO,
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"Client Initialisation (Version %s)",
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version_out);
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}
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conversation_data->state = RSYNC_SERV_INIT;
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conversation_add_proto_data(conversation, proto_rsync, conversation_data);
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break;
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case RSYNC_SERV_INIT:
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proto_tree_add_item(rsync_tree, hf_rsync_hdr_magic, tvb, offset, 8, TRUE);
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offset += 8;
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proto_tree_add_item(rsync_tree, hf_rsync_hdr_version, tvb, offset, 4, TRUE);
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tvb_get_nstringz0(tvb, offset, sizeof(version), version);
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offset += 4;
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if (check_col(pinfo->cinfo, COL_INFO)) {
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/* XXX - is this really a string? */
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version_out = format_text(version, 4);
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col_append_fstr(pinfo->cinfo, COL_INFO,
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"Server Initialisation (Version %s)",
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version_out);
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}
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conversation_data->state = RSYNC_CLIENT_QUERY;
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conversation_add_proto_data(conversation, proto_rsync, conversation_data);
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break;
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case RSYNC_CLIENT_QUERY:
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proto_tree_add_item(rsync_tree, hf_rsync_query_string, tvb, offset, -1, TRUE);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_str(pinfo->cinfo, COL_INFO, "Client Query");
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}
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conversation_data->state = RSYNC_SERV_MOTD;
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conversation_add_proto_data(conversation, proto_rsync, conversation_data);
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break;
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case RSYNC_SERV_MOTD:
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proto_tree_add_item(rsync_tree, hf_rsync_motd_string, tvb, offset, -1, TRUE);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_str(pinfo->cinfo, COL_INFO, "Server MOTD");
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}
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conversation_data->state = RSYNC_SERV_RESPONSE;
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conversation_add_proto_data(conversation, proto_rsync, conversation_data);
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break;
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case RSYNC_SERV_RESPONSE:
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/* there are two cases - file list, or authentication */
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tvb_get_nstringz0(tvb, offset, sizeof(auth_string), auth_string);
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if (0 == strncmp("@RSYNCD:", auth_string, 8)) {
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/* matches, so we assume its an authentication message */
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/* needs to handle the AUTHREQD case, but doesn't - FIXME */
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proto_tree_add_item(rsync_tree, hf_rsync_rsyncdok_string, tvb, offset, -1, TRUE);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_str(pinfo->cinfo, COL_INFO, "Authentication");
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}
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conversation_data->state = RSYNC_COMMAND;
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} else { /* it didn't match, so it is probably a module list */
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proto_tree_add_item(rsync_tree, hf_rsync_response_string, tvb, offset, -1, TRUE);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_str(pinfo->cinfo, COL_INFO, "Module list");
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}
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/* we need to check the end of the buffer for magic string */
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buff_length = tvb_length_remaining(tvb, offset);
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tvb_get_nstringz0(tvb, buff_length-14, sizeof(magic_string), magic_string);
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if (0 == strncmp("@RSYNCD: EXIT", magic_string, 14)) {
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/* that's all, folks */
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conversation_data->state = RSYNC_COMMAND;
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} else { /* there must be more data */
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conversation_data->state = RSYNC_SERV_RESPONSE;
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}
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}
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conversation_add_proto_data(conversation, proto_rsync, conversation_data);
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break;
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case RSYNC_COMMAND:
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if (pinfo->destport == glb_rsync_tcp_port) {
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/* then we are still sending commands */
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proto_tree_add_item(rsync_tree, hf_rsync_command_string, tvb, offset, -1, TRUE);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_str(pinfo->cinfo, COL_INFO, "Command");
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}
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conversation_data->state = RSYNC_COMMAND;
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conversation_add_proto_data(conversation, proto_rsync, conversation_data);
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break;
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} /* else we fall through to the data phase */
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case RSYNC_DATA:
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/* then we are still sending commands */
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proto_tree_add_item(rsync_tree, hf_rsync_data, tvb, offset, -1, TRUE);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_str(pinfo->cinfo, COL_INFO, "Data");
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}
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conversation_data->state = RSYNC_DATA;
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conversation_add_proto_data(conversation, proto_rsync, conversation_data);
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break;
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}
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}
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/* Packet dissection routine called by tcp (& udp) when port 873 detected */
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static void
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dissect_rsync(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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dissect_rsync_encap(tvb, pinfo, tree, rsync_desegment);
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}
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/* Register protocol with Wireshark. */
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void proto_reg_handoff_rsync(void);
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void
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proto_register_rsync(void)
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{
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static hf_register_info hf[] = {
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{&hf_rsync_hdr_magic,
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{"Magic Header", "rsync.hdr_magic",
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FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL }
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},
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{&hf_rsync_hdr_version,
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{"Header Version", "rsync.hdr_version",
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FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL }
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},
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{&hf_rsync_query_string,
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{"Client Query String", "rsync.query",
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FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL }
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},
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{&hf_rsync_response_string,
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{"Server Response String", "rsync.response",
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FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL }
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},
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{&hf_rsync_motd_string,
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{"Server MOTD String", "rsync.motd",
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FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL }
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},
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{&hf_rsync_rsyncdok_string,
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{"RSYNCD Response String", "rsync.response",
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FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL }
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},
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{&hf_rsync_command_string,
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{"Command String", "rsync.command",
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FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL }
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},
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{&hf_rsync_data,
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{"rsync data", "rsync.data",
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FT_BYTES, BASE_NONE, NULL, 0x0, "", HFILL }
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},
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};
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static gint *ett[] = {
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&ett_rsync,
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};
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module_t *rsync_module;
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proto_rsync = proto_register_protocol("RSYNC File Synchroniser",
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"RSYNC", "rsync");
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proto_register_field_array(proto_rsync, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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rsync_module = prefs_register_protocol(proto_rsync, proto_reg_handoff_rsync);
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prefs_register_uint_preference(rsync_module, "tcp_port",
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"rsync TCP Port",
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"Set the TCP port for RSYNC messages",
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10,
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&glb_rsync_tcp_port);
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prefs_register_bool_preference(rsync_module, "desegment",
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"Reassemble RSYNC messages spanning multiple TCP segments",
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"Whether the RSYNC dissector should reassemble messages spanning multiple TCP segments."
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" To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
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&rsync_desegment);
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}
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void
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proto_reg_handoff_rsync(void)
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{
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static gboolean initialized = FALSE;
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static guint saved_rsync_tcp_port;
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if (!initialized) {
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rsync_handle = create_dissector_handle(dissect_rsync, proto_rsync);
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initialized = TRUE;
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} else {
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dissector_delete("tcp.port", saved_rsync_tcp_port, rsync_handle);
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}
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dissector_add("tcp.port", glb_rsync_tcp_port, rsync_handle);
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saved_rsync_tcp_port = glb_rsync_tcp_port;
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}
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