forked from osmocom/wireshark
d530bd4e14
I (hopefully) didn't changed any protocol fields or preference file names, but only the GUI labels appearing in the protocol display and the protocol preferences. Also added a note to the protocol preferences (where appropriate), that you have to enable "Allow subdissectors to reassemble TCP streams" at the corresponding protocol settings for TCP reassembling to take effect. If you encounter any mistakes I've made here, please let me know... svn path=/trunk/; revision=11784
340 lines
10 KiB
C
340 lines
10 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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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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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 "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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dissector_handle_t rsync_handle;
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#define TCP_PORT_RSYNC 873
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static unsigned int 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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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->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->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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col_append_fstr(pinfo->cinfo, COL_INFO,
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"Client Initialisation (Version %s)",
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version);
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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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col_append_fstr(pinfo->cinfo, COL_INFO,
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"Server Initialisation (Version %s)",
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version);
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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_fstr(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, "Authenication");
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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_fstr(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 Ethereal. */
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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, NULL);
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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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rsync_handle = create_dissector_handle(dissect_rsync, proto_rsync);
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dissector_add("tcp.port", glb_rsync_tcp_port, rsync_handle);
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}
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