64a43e1c0e
of Tru64 UNIX) that define TRUE and FALSE. Fixes to some Tru64 compiler warnings. svn path=/trunk/; revision=3120
219 lines
7 KiB
C
219 lines
7 KiB
C
/* packet-sip.c
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* Routines for the Session Initiation Protocol (SIP) dissection.
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* RFC 2543
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*
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* TODO: Pay attention to Content-Type: It might not always be SDP.
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* Add hf_* fields for filtering support.
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*
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* Copyright 2000, Heikki Vatiainen <hessu@cs.tut.fi>
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*
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* $Id: packet-sip.c,v 1.14 2001/03/09 04:35:22 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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* Copied from packet-cops.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 <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#include "packet.h"
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#define TCP_PORT_SIP 5060
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#define UDP_PORT_SIP 5060
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/* Initialize the protocol and registered fields */
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static gint proto_sip = -1;
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static gint hf_msg_hdr = -1;
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/* Initialize the subtree pointers */
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static gint ett_sip = -1;
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static gint ett_sip_hdr = -1;
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static const char *sip_methods[] = {
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"<Invalid method>", /* Pad so that the real methods start at index 1 */
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"INVITE",
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"ACK",
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"OPTIONS",
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"BYE",
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"CANCEL",
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"REGISTER"
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};
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static int sip_is_request(tvbuff_t *tvb, guint32 offset);
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static gint sip_get_msg_offset(tvbuff_t *tvb, guint32 offset);
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static dissector_handle_t sdp_handle;
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#define SIP2_HDR "SIP/2.0 "
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#define SIP2_HDR_LEN (strlen (SIP2_HDR))
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/* Code to actually dissect the packets */
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static void dissect_sip(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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guint32 offset;
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gint eol, next_offset, msg_offset;
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tvbuff_t *next_tvb;
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gboolean is_request;
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/*
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* Note that "tvb_strneql()" doesn't throw exceptions, so
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* "sip_is_request()" won't throw an exception.
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*
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* Note that "tvb_find_line_end()" will return a value that
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* is not longer than what's in the buffer, so the
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* "tvb_get_ptr()" call s below won't throw exceptions.
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*/
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offset = 0;
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eol = tvb_find_line_end(tvb, 0, -1, &next_offset);
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is_request = sip_is_request(tvb, 0);
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/* XXX - Is this case-sensitive? RFC 2543 didn't explicitly say. */
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if (tvb_strneql(tvb, 0, SIP2_HDR, SIP2_HDR_LEN) != 0 && ! is_request)
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goto bad;
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if (check_col(pinfo->fd, COL_PROTOCOL))
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col_set_str(pinfo->fd, COL_PROTOCOL, "SIP");
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if (check_col(pinfo->fd, COL_INFO))
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col_add_fstr(pinfo->fd, COL_INFO, "%s: %s",
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is_request ? "Request" : "Status",
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is_request ?
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tvb_format_text(tvb, 0, eol - SIP2_HDR_LEN) :
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tvb_format_text(tvb, SIP2_HDR_LEN, eol - SIP2_HDR_LEN));
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msg_offset = sip_get_msg_offset(tvb, offset);
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if (msg_offset < 0) goto bad;
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if (tree) {
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proto_item *ti, *th;
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proto_tree *sip_tree, *hdr_tree;
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ti = proto_tree_add_item(tree, proto_sip, tvb, 0, tvb_length(tvb), FALSE);
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sip_tree = proto_item_add_subtree(ti, ett_sip);
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proto_tree_add_text(sip_tree, tvb, 0, next_offset, "%s-Line: %s",
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is_request ? "Request" : "Status",
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tvb_format_text(tvb, 0, eol));
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offset = next_offset;
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th = proto_tree_add_item(sip_tree, hf_msg_hdr, tvb, offset, msg_offset - offset, FALSE);
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hdr_tree = proto_item_add_subtree(th, ett_sip_hdr);
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/* - 2 since we have a CRLF separating the message-body */
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while (msg_offset - 2 > offset) {
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eol = tvb_find_line_end(tvb, offset, -1, &next_offset);
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proto_tree_add_text(hdr_tree, tvb, offset, next_offset - offset, "%s",
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tvb_format_text(tvb, offset, eol));
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offset = next_offset;
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}
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offset += 2; /* Skip the CRLF mentioned above */
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}
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if (tvb_length_remaining(tvb, msg_offset) > 0) {
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next_tvb = tvb_new_subset(tvb, offset, -1, -1);
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call_dissector(sdp_handle, next_tvb, pinfo, tree);
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}
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return;
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bad:
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next_tvb = tvb_new_subset(tvb, offset, -1, -1);
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dissect_data(next_tvb, 0, pinfo, tree);
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return;
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}
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/* Returns the offset to the start of the optional message-body, or
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* -1 for an error.
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*/
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static gint sip_get_msg_offset(tvbuff_t *tvb, guint32 offset)
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{
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gint eol;
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while ((eol = tvb_find_guint8(tvb, offset, tvb_length_remaining(tvb, offset), '\r')) > 0) {
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if (tvb_get_guint8(tvb, eol + 1) == '\n' &&
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tvb_get_guint8(tvb, eol + 2) == '\r' &&
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tvb_get_guint8(tvb, eol + 3) == '\n')
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return eol + 4;
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offset = eol + 2;
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}
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return -1;
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}
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static int sip_is_request(tvbuff_t *tvb, guint32 offset)
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{
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int i;
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for (i = 1; i < array_length(sip_methods); i++) {
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if (tvb_strneql(tvb, offset, sip_methods[i], strlen(sip_methods[i])) == 0)
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return i;
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}
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return 0;
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}
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/* Register the protocol with Ethereal */
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void proto_register_sip(void)
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{
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/* Setup list of header fields */
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static hf_register_info hf[] = {
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{ &hf_msg_hdr,
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{ "Message Header", "sip.msg_hdr",
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FT_NONE, 0, NULL, 0,
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"Message Header in SIP message" }
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},
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_sip,
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&ett_sip_hdr,
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};
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/* Register the protocol name and description */
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proto_sip = proto_register_protocol("Session Initiation Protocol",
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"SIP", "sip");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_sip, 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_sip(void)
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{
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dissector_add("tcp.port", TCP_PORT_SIP, dissect_sip, proto_sip);
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dissector_add("udp.port", UDP_PORT_SIP, dissect_sip, proto_sip);
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/*
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* Get a handle for the SDP dissector.
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*/
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sdp_handle = find_dissector("sdp");
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}
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