forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
It's not tied to the frame_data structure any more, so it belongs by itself. Clean up some #includes while we're at it; in particular, frame_data.h doesn't use anything related to tvbuffs, so don't have it gratuitiously include tvbuff.h. Change-Id: Ic32922d4a3840bac47007c5d4c546b8842245e0c Reviewed-on: https://code.wireshark.org/review/13518 Reviewed-by: Guy Harris <guy@alum.mit.edu>
387 lines
13 KiB
C
387 lines
13 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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* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#define NEW_PROTO_TREE_API
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/conversation.h>
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#include <epan/prefs.h>
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#include <epan/proto_data.h>
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void proto_register_rsync(void);
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#define RSYNCD_MAGIC_HEADER "@RSYNCD:"
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#define RSYNCD_MAGIC_HEADER_LEN 8
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#define RSYNCD_AUTHREQD "@RSYNCD: AUTHREQD "
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#define RSYNCD_AUTHREQD_LEN 18
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#define RSYNCD_EXIT "@RSYNCD: EXIT"
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#define RSYNCD_EXIT_LEN 13
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#define RSYNC_MODULE_LIST_QUERY "\n"
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#define RSYNC_MODULE_LIST_QUERY_LEN 1
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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_MODULE_LIST = 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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enum rsync_who {
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CLIENT,
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SERVER
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};
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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 client_state;
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rsync_state_t server_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 header_field_info *hfi_rsync = NULL;
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#define RSYNC_HF_INIT HFI_INIT(proto_rsync)
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static header_field_info hfi_rsync_hdr_magic RSYNC_HF_INIT = {
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"Magic Header", "rsync.hdr_magic",
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FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL };
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static header_field_info hfi_rsync_hdr_version RSYNC_HF_INIT = {
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"Header Version", "rsync.hdr_version",
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FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL };
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static header_field_info hfi_rsync_query_string RSYNC_HF_INIT = {
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"Client Query String", "rsync.query",
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FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL };
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static header_field_info hfi_rsync_motd_string RSYNC_HF_INIT = {
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"Server MOTD String", "rsync.motd",
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FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL };
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static header_field_info hfi_rsync_module_list_string RSYNC_HF_INIT = {
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"Server Module List", "rsync.module_list",
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FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL };
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static header_field_info hfi_rsync_rsyncdok_string RSYNC_HF_INIT = {
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"RSYNCD Response String", "rsync.response",
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FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL };
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static header_field_info hfi_rsync_command_string RSYNC_HF_INIT = {
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"Client Command String", "rsync.command",
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FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL };
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static header_field_info hfi_rsync_data RSYNC_HF_INIT = {
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"rsync data", "rsync.data",
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FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL };
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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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#define VERSION_LEN 4 /* 2 digits for main version; '.'; 1 digit for sub version */
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static void
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dissect_rsync_version_header(tvbuff_t *tvb, packet_info *pinfo, proto_tree *rsync_tree, enum rsync_who me)
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{
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int offset = 0;
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guint8 *version;
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guint len;
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proto_tree_add_item(rsync_tree, &hfi_rsync_hdr_magic, tvb, offset, RSYNCD_MAGIC_HEADER_LEN, ENC_ASCII|ENC_NA);
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offset += RSYNCD_MAGIC_HEADER_LEN;
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offset += 1; /* skip the space */
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proto_tree_add_item(rsync_tree, &hfi_rsync_hdr_version, tvb, offset, -1, ENC_ASCII|ENC_NA);
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len = tvb_reported_length_remaining(tvb, offset);
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version = tvb_get_string_enc(wmem_packet_scope(), tvb, offset, len, ENC_ASCII|ENC_NA);
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/* VERSION string can contain undesirable char (like \n) at the end. Trim it. */
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if (len > 0 && version[len - 1] == '\n')
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version[len - 1] = 0x0;
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s Initialisation (Version %s)", (me == SERVER ? "Server" : "Client"), version);
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}
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/* Packet dissection routine called by tcp (& udp) when port 873 detected */
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static int
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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 *rsync_frame_data_p;
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proto_item *ti;
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proto_tree *rsync_tree;
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enum rsync_who me;
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int offset = 0;
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guint buff_length;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "RSYNC");
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col_clear(pinfo->cinfo, COL_INFO);
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me = pinfo->srcport == glb_rsync_tcp_port ? SERVER : CLIENT;
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conversation = find_or_create_conversation(pinfo);
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conversation_data = (struct rsync_conversation_data *)conversation_get_proto_data(conversation, hfi_rsync->id);
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if (conversation_data == NULL) { /* new conversation */
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conversation_data = wmem_new(wmem_file_scope(), struct rsync_conversation_data);
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conversation_data->client_state = RSYNC_INIT;
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conversation_data->server_state = RSYNC_SERV_INIT;
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conversation_add_proto_data(conversation, hfi_rsync->id, 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, hfi_rsync, tvb, 0, -1, ENC_NA);
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rsync_tree = proto_item_add_subtree(ti, ett_rsync);
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rsync_frame_data_p = (struct rsync_frame_data *)p_get_proto_data(wmem_file_scope(), pinfo, hfi_rsync->id, 0);
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if (!rsync_frame_data_p) {
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/* then we haven't seen this frame before */
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rsync_frame_data_p = wmem_new(wmem_file_scope(), struct rsync_frame_data);
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rsync_frame_data_p->state = (me == SERVER) ? conversation_data->server_state : conversation_data->client_state;
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p_add_proto_data(wmem_file_scope(), pinfo, hfi_rsync->id, 0, rsync_frame_data_p);
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}
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if (me == SERVER) {
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switch (rsync_frame_data_p->state) {
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case RSYNC_SERV_INIT:
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dissect_rsync_version_header(tvb, pinfo, rsync_tree, me);
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conversation_data->server_state = RSYNC_SERV_MOTD;
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break;
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case RSYNC_SERV_MOTD:
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proto_tree_add_item(rsync_tree, &hfi_rsync_motd_string, tvb, offset, -1, ENC_ASCII|ENC_NA);
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col_set_str(pinfo->cinfo, COL_INFO, "Server MOTD");
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conversation_data->server_state = RSYNC_SERV_MOTD;
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break;
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case RSYNC_MODULE_LIST:
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/* there are two cases - file list, or authentication */
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if (0 == tvb_strneql(tvb, offset, RSYNCD_AUTHREQD, RSYNCD_AUTHREQD_LEN)) {
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/* matches, so we assume it's an authentication message */
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proto_tree_add_item(rsync_tree, &hfi_rsync_rsyncdok_string, tvb, offset, -1, ENC_ASCII|ENC_NA);
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col_set_str(pinfo->cinfo, COL_INFO, "Authentication");
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conversation_data->server_state = RSYNC_DATA;
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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, &hfi_rsync_module_list_string, tvb, offset, -1, ENC_ASCII|ENC_NA);
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/* we need to check the end of the buffer for magic string */
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buff_length = tvb_captured_length_remaining(tvb, offset);
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if (buff_length > RSYNCD_EXIT_LEN &&
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0 == tvb_strneql(tvb, buff_length-RSYNCD_EXIT_LEN-1, RSYNCD_EXIT, RSYNCD_EXIT_LEN)) {
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/* that's all, folks */
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col_set_str(pinfo->cinfo, COL_INFO, "Final module list");
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conversation_data->server_state = RSYNC_DATA;
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} else { /* there must be more data */
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col_set_str(pinfo->cinfo, COL_INFO, "Module list");
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conversation_data->server_state = RSYNC_MODULE_LIST;
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}
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}
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break;
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case RSYNC_DATA:
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proto_tree_add_item(rsync_tree, &hfi_rsync_data, tvb, offset, -1, ENC_NA);
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col_set_str(pinfo->cinfo, COL_INFO, "Data");
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conversation_data->server_state = RSYNC_DATA;
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break;
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default:
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/* Unknown state */
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break;
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}
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} else { /* me == CLIENT */
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switch (rsync_frame_data_p->state) {
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case RSYNC_INIT:
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dissect_rsync_version_header(tvb, pinfo, rsync_tree, me);
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conversation_data->client_state = RSYNC_CLIENT_QUERY;
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break;
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case RSYNC_CLIENT_QUERY:
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proto_tree_add_item(rsync_tree, &hfi_rsync_query_string, tvb, offset, -1, ENC_ASCII|ENC_NA);
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col_set_str(pinfo->cinfo, COL_INFO, "Client Query");
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conversation_data->client_state = RSYNC_COMMAND;
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if (tvb_captured_length(tvb) == RSYNC_MODULE_LIST_QUERY_LEN &&
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0 == tvb_strneql(tvb, offset, RSYNC_MODULE_LIST_QUERY, RSYNC_MODULE_LIST_QUERY_LEN)) {
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conversation_data->server_state = RSYNC_MODULE_LIST;
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} else {
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conversation_data->server_state = RSYNC_DATA;
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}
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break;
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case RSYNC_COMMAND:
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/* then we are still sending commands */
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proto_tree_add_item(rsync_tree, &hfi_rsync_command_string, tvb, offset, -1, ENC_ASCII|ENC_NA);
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col_set_str(pinfo->cinfo, COL_INFO, "Client Command");
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conversation_data->client_state = RSYNC_COMMAND;
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break;
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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, &hfi_rsync_data, tvb, offset, -1, ENC_NA);
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col_set_str(pinfo->cinfo, COL_INFO, "Data");
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conversation_data->client_state = RSYNC_DATA;
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break;
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default:
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/* Unknown state */
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break;
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}
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}
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return tvb_captured_length(tvb);
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}
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/* Packet dissection routine called by tcp (& udp) when port 873 detected */
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static int
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dissect_rsync(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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return 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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#ifndef HAVE_HFI_SECTION_INIT
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static header_field_info *hfi[] = {
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&hfi_rsync_hdr_magic,
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&hfi_rsync_hdr_version,
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&hfi_rsync_query_string,
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&hfi_rsync_module_list_string,
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&hfi_rsync_motd_string,
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&hfi_rsync_rsyncdok_string,
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&hfi_rsync_command_string,
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&hfi_rsync_data,
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};
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#endif
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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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int proto_rsync;
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proto_rsync = proto_register_protocol("RSYNC File Synchroniser",
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"RSYNC", "rsync");
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hfi_rsync = proto_registrar_get_nth(proto_rsync);
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proto_register_fields(proto_rsync, hfi, array_length(hfi));
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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"
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" \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
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&rsync_desegment);
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rsync_handle = create_dissector_handle(dissect_rsync, proto_rsync);
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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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initialized = TRUE;
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} else {
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dissector_delete_uint("tcp.port", saved_rsync_tcp_port, rsync_handle);
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}
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dissector_add_uint("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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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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