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SIP dissector, from Heikki Vatiainen. 

svn path=/trunk/; revision=2562
This commit is contained in:
Guy Harris 2000-11-04 07:50:47 +00:00
parent 76aa3d0a72
commit f123a86b70
4 changed files with 229 additions and 2 deletions
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1
AUTHORS
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@ -207,6 +207,7 @@ Heikki Vatiainen <hessu@cs.tut.fi> {
option to control whether to interpret the IPv4 TOS field as
such or as the DiffServ field
COPS
SIP (Session Initiation Protocol)
}
Greg Hankins <gregh@twoguys.org> {

3
Makefile.am
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@ -1,7 +1,7 @@
# Makefile.am
# Automake file for Ethereal
#
# $Id: Makefile.am,v 1.240 2000/11/04 03:30:40 guy Exp $
# $Id: Makefile.am,v 1.241 2000/11/04 07:50:47 guy Exp $
#
# Ethereal - Network traffic analyzer
# By Gerald Combs <gerald@zing.org>
@ -133,6 +133,7 @@ DISSECTOR_SOURCES = \
packet-sap.c \
packet-sctp.c \
packet-sdp.c \
packet-sip.c \
packet-smb.c \
packet-smb-browse.c \
packet-smb-common.c \

3
Makefile.nmake
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@ -1,7 +1,7 @@
## Makefile for building ethereal.exe with Microsoft C and nmake
## Use: nmake -f makefile.nmake
#
# $Id: Makefile.nmake,v 1.61 2000/11/04 03:30:40 guy Exp $
# $Id: Makefile.nmake,v 1.62 2000/11/04 07:50:47 guy Exp $
include config.nmake
@ -121,6 +121,7 @@ DISSECTOR_SOURCES = \
packet-sap.c \
packet-sctp.c \
packet-sdp.c \
packet-sip.c \
packet-smb.c \
packet-smb-browse.c \
packet-smb-common.c \

224
packet-sip.c Normal file
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@ -0,0 +1,224 @@
/* packet-sip.c
* Routines for the Session Initiation Protocol (SIP) dissection.
* RFC 2543
*
* TODO: Make sure that any of CRLF, CR or LF is treated as valid line terminator.
* Pay attention to Content-Type: It might not always be SDP.
* Add hf_* fields for filtering support.
*
* Copyright 2000, Heikki Vatiainen <hessu@cs.tut.fi>
*
* $Id: packet-sip.c,v 1.1 2000/11/04 07:50:47 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
* Copyright 1998 Gerald Combs
*
* Copied from packet-cops.c
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include "packet.h"
#include "packet-sdp.h"
#define TCP_PORT_SIP 5060
#define UDP_PORT_SIP 5060
/* Initialize the protocol and registered fields */
static gint proto_sip = -1;
static gint hf_msg_hdr = -1;
/* Initialize the subtree pointers */
static gint ett_sip = -1;
static gint ett_sip_hdr = -1;
static const char *sip_methods[] = {
"<Invalid method>", /* Pad so that the real methods start at index 1 */
"INVITE",
"ACK",
"OPTIONS",
"BYE",
"CANCEL",
"REGISTER"
};
static int sip_is_request(const char *line);
static guint8 *sip_kill_version(guint8 *orig, guint8 *killed);
static gint sip_get_msg_offset(tvbuff_t *tvb, guint32 offset);
/* Code to actually dissect the packets */
static void dissect_sip(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint8 buf[1500], tmp[1500];
guint32 offset;
gint eol, msg_offset;
tvbuff_t *next_tvb;
const guint8 *next_pd;
int next_offset;
CHECK_DISPLAY_AS_DATA(proto_sip, tvb, pinfo, tree);
pinfo->current_proto = "SIP";
if (check_col(pinfo->fd, COL_PROTOCOL))
col_add_str(pinfo->fd, COL_PROTOCOL, "SIP");
offset = 0;
eol = tvb_find_guint8(tvb, 0, tvb_length(tvb), '\r');
if (eol < 0) goto bad;
eol = tvb_get_nstringz0(tvb, 0, eol, buf);
if (eol < 0) goto bad;
eol += 2;
if (tvb_get_guint8(tvb, eol) == '\n') {
eol++;
}
if (check_col(pinfo->fd, COL_INFO))
col_add_fstr(pinfo->fd, COL_INFO, "%s: %s",
sip_is_request(buf) ? "Request" : "Status",
sip_kill_version(buf, tmp));
col_set_writable(pinfo->fd, FALSE);
if (tree) {
proto_item *ti, *th;
proto_tree *sip_tree, *hdr_tree;
ti = proto_tree_add_item(tree, proto_sip, tvb, 0, tvb_length(tvb), FALSE);
sip_tree = proto_item_add_subtree(ti, ett_sip);
proto_tree_add_text(sip_tree, tvb, offset, eol, "%s-Line: %s",
sip_is_request(buf) ? "Request" : "Status", buf);
offset = eol;
msg_offset = sip_get_msg_offset(tvb, offset);
if (msg_offset < 0) goto bad;
th = proto_tree_add_item(sip_tree, hf_msg_hdr, tvb, offset, msg_offset - offset, FALSE);
hdr_tree = proto_item_add_subtree(th, ett_sip_hdr);
/* - 2 since we have a CRLF separating the message-body */
while (msg_offset - 2 > offset) {
int err;
eol = tvb_find_guint8(tvb, offset, tvb_length_remaining(tvb, offset), '\r');
err = tvb_get_nstringz0(tvb, offset, eol - offset, buf);
if (err < 0) goto bad;
proto_tree_add_text(hdr_tree, tvb, offset, strlen(buf) + 2, "%s", buf);
offset = eol + 2;
}
offset += 2; /* Skip the CRLF mentioned above */
}
if (tvb_length_remaining(tvb, offset) > 0) {
next_tvb = tvb_new_subset(tvb, offset, -1, -1);
tvb_compat(next_tvb, &next_pd, &next_offset);
dissect_sdp(next_pd, next_offset, pinfo->fd, tree);
}
return;
bad:
next_tvb = tvb_new_subset(tvb, offset, -1, -1);
dissect_data(tvb, pinfo, tree);
return;
}
/* Returns the offset to the start of the optional message-body, or
* -1 for an error.
*/
static gint sip_get_msg_offset(tvbuff_t *tvb, guint32 offset)
{
gint eol;
while ((eol = tvb_find_guint8(tvb, offset, tvb_length_remaining(tvb, offset), '\r')) > 0) {
if (tvb_get_guint8(tvb, eol + 1) == '\n' &&
tvb_get_guint8(tvb, eol + 2) == '\r' &&
tvb_get_guint8(tvb, eol + 3) == '\n')
return eol + 4;
offset = eol + 2;
}
return -1;
}
/* Remove the SIP-Version, 7 characters, from Request- or Status-Line.
* Returns the modifed Line
*/
static guint8 *sip_kill_version(guint8 *orig, guint8 *killed)
{
if (sip_is_request(orig)) {
strncpy(killed, orig, strlen(orig) - strlen("SIP/2.0"));
killed[strlen(orig) - strlen("SIP/2.0")] = '\0';
} else
strcpy(killed, orig + strlen("SIP/2.0") + 1); /* + 1 to skip the space */
return killed;
}
static int sip_is_request(const char *line)
{
int i;
for (i = 1; i < array_length(sip_methods); i++) {
if (strncmp(line, sip_methods[i], strlen(sip_methods[i])) == 0)
return i;
}
return 0;
}
/* Register the protocol with Ethereal */
void proto_register_sip(void)
{
/* Setup list of header fields */
static hf_register_info hf[] = {
{ &hf_msg_hdr,
{ "Message Header", "sip.msg_hdr",
FT_NONE, 0, NULL, 0,
"Message Header in SIP message" }
},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_sip,
&ett_sip_hdr,
};
/* Register the protocol name and description */
proto_sip = proto_register_protocol("Session Initiation Protocol", "sip");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_sip, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
};
void
proto_reg_handoff_sip(void)
{
dissector_add("tcp.port", TCP_PORT_SIP, dissect_sip);
dissector_add("udp.port", UDP_PORT_SIP, dissect_sip);
}