forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
That removes most of the uses of the frame number field in the frame_data structure. Change-Id: Ie22e4533e87f8360d7c0a61ca6ffb796cc233f22 Reviewed-on: https://code.wireshark.org/review/13509 Reviewed-by: Guy Harris <guy@alum.mit.edu>
221 lines
7.6 KiB
C
221 lines
7.6 KiB
C
/* packet-finger.c
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* Routines for basic finger dissection (see http://tools.ietf.org/html/rfc742)
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* Copyright 2013, Christopher Maynard <Christopher.Maynard@gtech.com>
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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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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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/expert.h>
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void proto_register_finger(void);
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void proto_reg_handoff_finger(void);
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#define FINGER_PORT 79 /* This is the registered IANA port */
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static int proto_finger = -1;
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static int hf_finger_query = -1;
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static int hf_finger_response = -1;
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static int hf_finger_response_in = -1;
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static int hf_finger_response_to = -1;
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static int hf_finger_response_time = -1;
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static expert_field ei_finger_nocrlf = EI_INIT;
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static gint ett_finger = -1;
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typedef struct _finger_transaction_t {
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guint32 req_frame;
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guint32 rep_frame;
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nstime_t req_time;
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} finger_transaction_t;
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static int
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dissect_finger(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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void *data _U_)
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{
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proto_item *ti, *expert_ti;
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proto_tree *finger_tree;
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conversation_t *conversation;
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finger_transaction_t *finger_trans;
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gboolean is_query;
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guint len;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "FINGER");
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if (pinfo->destport == FINGER_PORT) {
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is_query = TRUE;
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col_set_str(pinfo->cinfo, COL_INFO, "Query");
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} else {
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is_query = FALSE;
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col_set_str(pinfo->cinfo, COL_INFO, "Response");
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}
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conversation = find_or_create_conversation(pinfo);
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finger_trans = (finger_transaction_t *)conversation_get_proto_data(conversation, proto_finger);
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if (finger_trans == NULL) {
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finger_trans = wmem_new0(wmem_file_scope(), finger_transaction_t);
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conversation_add_proto_data(conversation, proto_finger, finger_trans);
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}
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len = tvb_reported_length(tvb);
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if (!PINFO_FD_VISITED(pinfo)) {
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if (pinfo->can_desegment) {
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if (is_query) {
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if ((len < 2) || (tvb_memeql(tvb, len - 2, "\r\n", 2))) {
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pinfo->desegment_len = DESEGMENT_ONE_MORE_SEGMENT;
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pinfo->desegment_offset = 0;
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return -1;
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} else {
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finger_trans->req_frame = pinfo->num;
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finger_trans->req_time = pinfo->abs_ts;
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}
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} else {
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pinfo->desegment_len = DESEGMENT_UNTIL_FIN;
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pinfo->desegment_offset = 0;
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return -1;
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}
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}
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} else if (is_query && (finger_trans->req_frame == 0)) {
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finger_trans->req_frame = pinfo->num;
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finger_trans->req_time = pinfo->abs_ts;
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}
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if (!is_query && (finger_trans->rep_frame == 0)) {
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/* By comparing finger_trans->rep_frame to 0, if reassembly is turned
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* on, finger_trans->rep_frame will be assigned to the reassembled frame
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* number, and if reassembly is turned off, finger_trans->rep_frame will
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* be assigned to the first frame number of the response. This seems
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* to match other protocols' behavior. The alternative is:
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* if (pinfo->num > finger_trans->rep_frame)
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* which will give us the same frame number either way.
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*/
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finger_trans->rep_frame = pinfo->num;
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}
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ti = proto_tree_add_protocol_format(tree, proto_finger, tvb, 0, -1,
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"FINGER: %s", is_query ? "Query" : "Response");
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finger_tree = proto_item_add_subtree(ti, ett_finger);
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if (is_query) {
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expert_ti = proto_tree_add_item(finger_tree, hf_finger_query, tvb, 0, -1, ENC_ASCII|ENC_NA);
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if ((len < 2) || (tvb_memeql(tvb, len - 2, "\r\n", 2))) {
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/*
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* From RFC742, Send a single "command line", ending with <CRLF>.
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*/
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expert_add_info(pinfo, expert_ti, &ei_finger_nocrlf);
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}
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if (tree && finger_trans->rep_frame) {
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ti = proto_tree_add_uint(finger_tree, hf_finger_response_in,
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tvb, 0, 0, finger_trans->rep_frame);
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PROTO_ITEM_SET_GENERATED(ti);
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}
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} else if (tree && finger_trans->rep_frame) {
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proto_tree_add_item(finger_tree, hf_finger_response, tvb, 0, -1, ENC_ASCII|ENC_NA);
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if (finger_trans->req_frame) {
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nstime_t ns;
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ti = proto_tree_add_uint(finger_tree, hf_finger_response_to,
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tvb, 0, 0, finger_trans->req_frame);
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PROTO_ITEM_SET_GENERATED(ti);
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if (pinfo->num == finger_trans->rep_frame) {
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nstime_delta(&ns, &pinfo->abs_ts, &finger_trans->req_time);
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ti = proto_tree_add_time(finger_tree, hf_finger_response_time, tvb, 0, 0, &ns);
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PROTO_ITEM_SET_GENERATED(ti);
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}
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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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void
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proto_register_finger(void)
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{
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expert_module_t *expert_finger;
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static hf_register_info hf[] = {
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{ &hf_finger_query,
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{ "Query", "finger.query", FT_STRING, BASE_NONE, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_finger_response,
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{ "Response", "finger.response", FT_STRING, BASE_NONE, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_finger_response_in,
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{ "Response In", "finger.response_in", FT_FRAMENUM, BASE_NONE, NULL,
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0x0, "The response to this FINGER query is in this frame",
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HFILL }
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},
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{ &hf_finger_response_to,
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{ "Request In", "finger.response_to", FT_FRAMENUM, BASE_NONE, NULL,
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0x0, "This is a response to the FINGER query in this frame",
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HFILL }
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},
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{ &hf_finger_response_time,
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{ "Response Time", "finger.response_time", FT_RELATIVE_TIME,
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BASE_NONE, NULL, 0x0,
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"The time between the Query and the Response", HFILL }
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}
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};
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static gint *ett[] = {
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&ett_finger
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};
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static ei_register_info ei[] = {
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{ &ei_finger_nocrlf,
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{ "finger.nocrlf", PI_MALFORMED, PI_WARN, "Missing <CR><LF>", EXPFILL}
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}
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};
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proto_finger = proto_register_protocol("finger", "FINGER", "finger");
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proto_register_field_array(proto_finger, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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expert_finger = expert_register_protocol(proto_finger);
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expert_register_field_array(expert_finger, ei, array_length(ei));
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}
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void
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proto_reg_handoff_finger(void)
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{
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static dissector_handle_t finger_handle;
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finger_handle = create_dissector_handle(dissect_finger, proto_finger);
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dissector_add_uint("tcp.port", FINGER_PORT, finger_handle);
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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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