forked from osmocom/wireshark
b69c251c80
> This patch: > - adds a few filterable fields (currently there are only hidden > boolean fields for request and response). svn path=/trunk/; revision=17629
264 lines
7.5 KiB
C
264 lines
7.5 KiB
C
/* packet-pop.c
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* Routines for pop packet dissection
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* RFC 1939
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* Copyright 1999, Richard Sharpe <rsharpe@ns.aus.com>
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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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* Copied from packet-tftp.c
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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 <string.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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static int proto_pop = -1;
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static int hf_pop_response = -1;
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static int hf_pop_response_indicator = -1;
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static int hf_pop_response_description = -1;
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static int hf_pop_response_data = -1;
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static int hf_pop_request = -1;
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static int hf_pop_request_command = -1;
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static int hf_pop_request_parameter = -1;
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static int hf_pop_request_data = -1;
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static gint ett_pop = -1;
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static gint ett_pop_reqresp = -1;
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static dissector_handle_t data_handle;
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#define TCP_PORT_POP 110
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static gboolean response_is_continuation(const guchar *data);
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static void
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dissect_pop(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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gboolean is_request;
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gboolean is_continuation;
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proto_tree *pop_tree, *reqresp_tree;
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proto_item *ti;
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gint offset = 0;
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const guchar *line;
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gint next_offset;
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int linelen;
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int tokenlen;
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const guchar *next_token;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "POP");
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/*
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* Find the end of the first line.
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*
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* Note that "tvb_find_line_end()" will return a value that is
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* not longer than what's in the buffer, so the "tvb_get_ptr()"
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* call won't throw an exception.
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*/
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linelen = tvb_find_line_end(tvb, offset, -1, &next_offset, FALSE);
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line = tvb_get_ptr(tvb, offset, linelen);
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if (pinfo->match_port == pinfo->destport) {
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is_request = TRUE;
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is_continuation = FALSE;
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} else {
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is_request = FALSE;
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is_continuation = response_is_continuation(line);
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}
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if (check_col(pinfo->cinfo, COL_INFO)) {
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/*
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* Put the first line from the buffer into the summary
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* if it's a POP request or reply (but leave out the
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* line terminator).
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* Otherwise, just call it a continuation.
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*/
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if (is_continuation)
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col_set_str(pinfo->cinfo, COL_INFO, "Continuation");
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else
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s: %s",
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is_request ? "Request" : "Response",
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format_text(line, linelen));
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}
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if (tree) {
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ti = proto_tree_add_item(tree, proto_pop, tvb, offset, -1,
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FALSE);
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pop_tree = proto_item_add_subtree(ti, ett_pop);
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if (is_continuation) {
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/*
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* Put the whole packet into the tree as data.
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*/
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call_dissector(data_handle,tvb, pinfo, pop_tree);
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return;
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}
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/*
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* Put the line into the protocol tree.
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*/
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ti = proto_tree_add_string_format(pop_tree,
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(is_request) ?
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hf_pop_request :
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hf_pop_response,
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tvb, offset,
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next_offset - offset,
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"", "%s",
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tvb_format_text(tvb, offset, next_offset - offset));
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reqresp_tree = proto_item_add_subtree(ti, ett_pop_reqresp);
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/*
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* Extract the first token, and, if there is a first
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* token, add it as the request or reply code.
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*/
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tokenlen = get_token_len(line, line + linelen, &next_token);
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if (tokenlen != 0) {
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proto_tree_add_item(reqresp_tree,
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(is_request) ?
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hf_pop_request_command :
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hf_pop_response_indicator,
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tvb, offset, tokenlen, FALSE);
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offset += next_token - line;
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linelen -= next_token - line;
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line = next_token;
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}
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/*
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* Add the rest of the first line as request or
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* reply param/description.
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*/
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if (linelen != 0) {
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proto_tree_add_item(reqresp_tree,
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(is_request) ?
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hf_pop_request_parameter :
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hf_pop_response_description,
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tvb, offset, linelen, FALSE);
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}
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offset = next_offset;
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/*
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* Show the rest of the request or response as text,
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* a line at a time.
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*/
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while (tvb_offset_exists(tvb, offset)) {
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/*
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* Find the end of the line.
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*/
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linelen = tvb_find_line_end(tvb, offset, -1,
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&next_offset, FALSE);
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/*
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* Put this line.
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*/
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proto_tree_add_string_format(pop_tree,
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(is_request) ?
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hf_pop_request_data :
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hf_pop_response_data,
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tvb, offset,
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next_offset - offset,
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"", "%s",
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tvb_format_text(tvb, offset, next_offset - offset));
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offset = next_offset;
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}
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}
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}
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static gboolean response_is_continuation(const guchar *data)
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{
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if (strncmp(data, "+OK", strlen("+OK")) == 0)
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return FALSE;
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if (strncmp(data, "-ERR", strlen("-ERR")) == 0)
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return FALSE;
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return TRUE;
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}
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void
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proto_register_pop(void)
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{
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static hf_register_info hf[] = {
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{ &hf_pop_response,
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{ "Response", "pop.response",
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FT_STRING, BASE_NONE, NULL, 0x0,
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"Response", HFILL }},
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{ &hf_pop_response_indicator,
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{ "Response indicator", "pop.response.indicator",
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FT_STRING, BASE_NONE, NULL, 0x0,
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"Response indicator", HFILL }},
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{ &hf_pop_response_description,
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{ "Response description", "pop.response.description",
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FT_STRING, BASE_NONE, NULL, 0x0,
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"Response description", HFILL }},
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{ &hf_pop_response_data,
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{ "Data", "pop.response.data",
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FT_STRING, BASE_NONE, NULL, 0x0,
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"Response Data", HFILL }},
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{ &hf_pop_request,
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{ "Request", "pop.request",
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FT_STRING, BASE_NONE, NULL, 0x0,
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"Request", HFILL }},
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{ &hf_pop_request_command,
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{ "Request command", "pop.request.command",
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FT_STRING, BASE_NONE, NULL, 0x0,
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"Request command", HFILL }},
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{ &hf_pop_request_parameter,
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{ "Request parameter", "pop.request.parameter",
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FT_STRING, BASE_NONE, NULL, 0x0,
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"Request parameter", HFILL }},
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{ &hf_pop_request_data,
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{ "Data", "pop.request.data",
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FT_STRING, BASE_NONE, NULL, 0x0,
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"Request data", HFILL }},
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};
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static gint *ett[] = {
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&ett_pop,
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&ett_pop_reqresp,
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};
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proto_pop = proto_register_protocol("Post Office Protocol", "POP", "pop");
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proto_register_field_array(proto_pop, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_pop(void)
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{
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dissector_handle_t pop_handle;
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pop_handle = create_dissector_handle(dissect_pop, proto_pop);
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dissector_add("tcp.port", TCP_PORT_POP, pop_handle);
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data_handle = find_dissector("data");
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}
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