2013-11-14 21:04:05 +00:00
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/* packet-whois.c
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* Routines for whois dissection (see http://tools.ietf.org/html/rfc3912)
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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 <glib.h>
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#include <epan/packet.h>
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#include <epan/conversation.h>
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#include <epan/wmem/wmem.h>
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#include <epan/expert.h>
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#define WHOIS_PORT 43 /* This is the registered IANA port (nicname) */
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2013-12-10 17:41:57 +00:00
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void proto_register_whois(void);
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2013-11-14 21:04:05 +00:00
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void proto_reg_handoff_whois(void);
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static int proto_whois = -1;
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static int hf_whois_query = -1;
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static int hf_whois_answer = -1;
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static int hf_whois_answer_in = -1;
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static int hf_whois_answer_to = -1;
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static int hf_whois_response_time = -1;
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static expert_field ei_whois_nocrlf = EI_INIT;
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static gint ett_whois = -1;
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typedef struct _whois_transaction_t {
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2013-12-13 00:44:32 +00:00
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guint32 req_frame;
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guint32 rep_frame;
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2013-11-14 21:04:05 +00:00
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nstime_t req_time;
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} whois_transaction_t;
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static int
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dissect_whois(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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void *data _U_)
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{
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2013-12-13 00:44:32 +00:00
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proto_item *ti, *expert_ti;
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proto_tree *whois_tree;
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conversation_t *conversation;
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2013-11-14 21:04:05 +00:00
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whois_transaction_t *whois_trans;
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2013-12-13 00:44:32 +00:00
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gboolean is_query;
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guint len;
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2013-11-14 21:04:05 +00:00
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "WHOIS");
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if (pinfo->destport == WHOIS_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, "Answer");
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}
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conversation = find_or_create_conversation(pinfo);
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2013-11-14 21:20:49 +00:00
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whois_trans = (whois_transaction_t *)conversation_get_proto_data(conversation, proto_whois);
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2013-11-14 21:04:05 +00:00
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if (whois_trans == NULL) {
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whois_trans = wmem_new0(wmem_file_scope(), whois_transaction_t);
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conversation_add_proto_data(conversation, proto_whois, whois_trans);
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}
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len = tvb_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 (0);
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} else {
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whois_trans->req_frame = pinfo->fd->num;
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whois_trans->req_time = pinfo->fd->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 (0);
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}
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}
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} else if (is_query && (whois_trans->req_frame == 0)) {
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whois_trans->req_frame = pinfo->fd->num;
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whois_trans->req_time = pinfo->fd->abs_ts;
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}
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if (!is_query && (whois_trans->rep_frame == 0)) {
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/* By comparing whois_trans->rep_frame to 0, if reassembly is turned
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* on, whois_trans->rep_frame will be assigned to the reassembled frame
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* number, and if reassembly is turned off, whois_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->fd->num > whois_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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whois_trans->rep_frame = pinfo->fd->num;
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}
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ti = proto_tree_add_protocol_format(tree, proto_whois, tvb, 0, -1,
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"WHOIS: %s", is_query ? "Query" : "Answer");
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whois_tree = proto_item_add_subtree(ti, ett_whois);
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if (is_query) {
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expert_ti = proto_tree_add_item(whois_tree, hf_whois_query, tvb, 0, -1, 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 RFC3912, section 2:
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* All requests are terminated with ASCII CR and then ASCII LF.
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*/
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expert_add_info(pinfo, expert_ti, &ei_whois_nocrlf);
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}
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if (tree && whois_trans->rep_frame) {
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ti = proto_tree_add_uint(whois_tree, hf_whois_answer_in,
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tvb, 0, 0, whois_trans->rep_frame);
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PROTO_ITEM_SET_GENERATED(ti);
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}
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} else if (tree && whois_trans->rep_frame) {
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proto_tree_add_item(whois_tree, hf_whois_answer, tvb, 0, -1, ENC_NA);
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if (whois_trans->req_frame) {
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nstime_t ns;
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ti = proto_tree_add_uint(whois_tree, hf_whois_answer_to,
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tvb, 0, 0, whois_trans->req_frame);
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PROTO_ITEM_SET_GENERATED(ti);
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if (pinfo->fd->num == whois_trans->rep_frame) {
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nstime_delta(&ns, &pinfo->fd->abs_ts, &whois_trans->req_time);
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ti = proto_tree_add_time(whois_tree, hf_whois_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 (len);
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}
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void
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proto_register_whois(void)
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{
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expert_module_t *expert_whois;
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static hf_register_info hf[] = {
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{ &hf_whois_query,
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{ "Query", "whois.query", FT_STRING, BASE_NONE, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_whois_answer,
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{ "Answer", "whois.answer", FT_STRING, BASE_NONE, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_whois_answer_in,
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{ "Answer In", "whois.answer_in", FT_FRAMENUM, BASE_NONE, NULL,
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0x0, "The answer to this WHOIS query is in this frame",
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HFILL }
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},
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{ &hf_whois_answer_to,
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{ "Query In", "whois.answer_to", FT_FRAMENUM, BASE_NONE, NULL,
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0x0, "This is the answer to the WHOIS query in this frame",
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HFILL }
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},
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{ &hf_whois_response_time,
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{ "Response Time", "whois.response_time", FT_RELATIVE_TIME,
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BASE_NONE, NULL, 0x0,
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"The time between the Query and the Answer", HFILL }
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}
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};
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static gint *ett[] = {
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&ett_whois
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};
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static ei_register_info ei[] = {
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{ &ei_whois_nocrlf,
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{ "whois.nocrlf", PI_MALFORMED, PI_WARN, "Missing <CR><LF>", EXPFILL}
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}
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};
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proto_whois = proto_register_protocol("whois", "WHOIS", "whois");
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proto_register_field_array(proto_whois, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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expert_whois = expert_register_protocol(proto_whois);
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expert_register_field_array(expert_whois, ei, array_length(ei));
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}
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void
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proto_reg_handoff_whois(void)
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{
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static dissector_handle_t whois_handle;
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whois_handle = new_create_dissector_handle(dissect_whois, proto_whois);
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dissector_add_uint("tcp.port", WHOIS_PORT, whois_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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2013-12-13 00:44:32 +00:00
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* tab-width: 8
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2013-11-14 21:04:05 +00:00
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* indent-tabs-mode: nil
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* End:
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*
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2013-12-13 00:44:32 +00:00
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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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2013-11-14 21:04:05 +00:00
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*/
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