Support for RTCP and RTP, from Jason Lango.

svn path=/trunk/; revision=1885

1 files changed, 215 insertions, 0 deletions

diff --git a/packet-rtp.c b/packet-rtp.c
new file mode 100644
index 0000000000..a4b9c1119a
--- /dev/null
+++ b/packet-rtp.c
@@ -0,0 +1,215 @@
+/* packet-rtp.c
+ * Routines for RTP packet disassembly
+ *
+ * Jason Lango <jal@netapp.com>
+ *
+ * $Id: packet-rtp.c,v 1.1 2000/04/21 01:45:56 guy Exp $
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@zing.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * 
+ * 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.
+ *
+ *
+ */
+
+#include "config.h"
+
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+
+#include <string.h>
+#include <ctype.h>
+#include <stddef.h>
+
+#include <glib.h>
+#include "packet.h"
+#include "packet-rtp.h"
+
+static int proto_rtp = -1;
+
+static gint ett_rtp = -1;
+
+#define _RTP_FLAG_BITS(hdr, s, n) \
+	((u_int)(((hdr)->rtp_flag_bits >> (8 - (s) - (n))) & ((1 << (n)) - 1)))
+#define RTP_VERSION(hdr)	_RTP_FLAG_BITS(hdr, 0, 2)
+#define RTP_PADDING(hdr)	_RTP_FLAG_BITS(hdr, 2, 1)
+#define RTP_EXTENSION(hdr)	_RTP_FLAG_BITS(hdr, 3, 1)
+#define RTP_CSRC_COUNT(hdr)	_RTP_FLAG_BITS(hdr, 4, 4)
+
+#define RTP_MARKER(hdr)		((u_int)((hdr)->rtp_type_bits >> 7))
+#define RTP_PAYLOAD_TYPE(hdr)	((u_int)((hdr)->rtp_type_bits & 0x7F))
+
+typedef struct rtp_hdr {
+	guint8	rtp_flag_bits;
+	guint8	rtp_type_bits;
+	guint16	rtp_seq;
+	guint32	rtp_timestamp;
+	guint32	rtp_ssrc;
+} rtp_hdr_t;
+
+typedef struct rtp_hdr_ext {
+	guint16	rtp_ext_app;	/* defined by RTP profile */
+	guint16	rtp_ext_length;	/* length of extension data in 32 bit words */
+} rtp_hdr_ext_t;
+
+void
+dissect_rtp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
+{
+	proto_tree	*rtp_tree;
+	proto_item	*ti;
+	const u_char	*data, *dataend;
+	rtp_hdr_t	hdr;
+	int		end_offset;
+	int		ii;
+	guint32		*csrc_ptr;
+	rtp_hdr_ext_t	ext;
+
+	data = &pd[offset];
+	dataend = data + END_OF_FRAME;
+	end_offset = offset + END_OF_FRAME;
+
+	memcpy(&hdr, data, END_OF_FRAME < sizeof(rtp_hdr_t) ?
+		END_OF_FRAME : sizeof(rtp_hdr_t));
+	hdr.rtp_seq = ntohs(hdr.rtp_seq);
+	hdr.rtp_timestamp = ntohl(hdr.rtp_timestamp);
+	hdr.rtp_ssrc = ntohl(hdr.rtp_ssrc);
+
+	if (check_col(fd, COL_PROTOCOL))
+		col_add_str(fd, COL_PROTOCOL, "RTP");
+	if (check_col(fd, COL_INFO)) {
+		col_add_fstr(fd, COL_INFO, "SSRC: %lu  %sPayload: %u  Seq: %u",
+			(u_long) hdr.rtp_ssrc,
+			RTP_MARKER(&hdr) ? "*Mark*  " : "",
+			(u_int) RTP_PAYLOAD_TYPE(&hdr),
+			(u_int) hdr.rtp_seq);
+	}
+
+	rtp_tree = NULL;
+
+	if (tree) {
+		ti = proto_tree_add_item(tree, proto_rtp, offset, END_OF_FRAME,
+			NULL);
+		rtp_tree = proto_item_add_subtree(ti, ett_rtp);
+	}
+
+	if (!rtp_tree)
+		return;
+
+	if (offset >= end_offset)
+		goto bad_len;
+	proto_tree_add_text(rtp_tree, offset, 1, "Version: %u (%s)",
+		RTP_VERSION(&hdr),
+		RTP_VERSION(&hdr) == 3 ? "New Unknown Version" :
+		RTP_VERSION(&hdr) == 2 ? "RFC 1889 Version" :
+		RTP_VERSION(&hdr) == 1 ? "First Draft Version" :
+		"Old Vat Version");
+	proto_tree_add_text(rtp_tree, offset, 1, "Padding: %u",
+		RTP_PADDING(&hdr));
+	proto_tree_add_text(rtp_tree, offset, 1, "Extension: %u",
+		RTP_EXTENSION(&hdr));
+	proto_tree_add_text(rtp_tree, offset, 1, "CSRC Count: %u",
+		RTP_CSRC_COUNT(&hdr));
+	offset++;
+
+	if (offset >= end_offset)
+		goto bad_len;
+	proto_tree_add_text(rtp_tree, offset, 1, "Marker: %u",
+		RTP_MARKER(&hdr));
+	proto_tree_add_text(rtp_tree, offset, 1, "Payload Type: %u",
+		RTP_PAYLOAD_TYPE(&hdr));
+	offset++;
+
+	if (offset >= end_offset)
+		goto bad_len;
+	proto_tree_add_text(rtp_tree, offset, 2, "Seq: %u",
+		(u_int) hdr.rtp_seq);
+	offset += 2;
+
+	if (offset >= end_offset)
+		goto bad_len;
+	proto_tree_add_text(rtp_tree, offset, 4, "Timestamp: %lu",
+		(u_long) hdr.rtp_timestamp);
+	offset += 4;
+
+	if (offset >= end_offset)
+		goto bad_len;
+	proto_tree_add_text(rtp_tree, offset, 4, "SSRC: %lu",
+		(u_long) hdr.rtp_ssrc);
+	offset += 4;
+
+	csrc_ptr = (guint32*) (data + sizeof(rtp_hdr_t));
+	for (ii = 0; ii < RTP_CSRC_COUNT(&hdr); ii++) {
+		guint32 csrc;
+		if (offset >= end_offset)
+			goto bad_len;
+		csrc = pntohl(csrc_ptr);
+		proto_tree_add_text(rtp_tree, offset, 4, "CSRC %d: %lu",
+			ii + 1, (u_long) csrc);
+		offset += 4;
+		csrc_ptr++;
+	}
+
+	if (RTP_EXTENSION(&hdr)) {
+		memcpy(&ext, data + sizeof(rtp_hdr_t),
+			END_OF_FRAME < sizeof(rtp_hdr_ext_t) ?
+			END_OF_FRAME : sizeof(rtp_hdr_ext_t));
+		ext.rtp_ext_app = ntohs(ext.rtp_ext_app);
+		ext.rtp_ext_length = ntohs(ext.rtp_ext_length);
+
+		proto_tree_add_text(rtp_tree, offset, 2,
+			"Extension-defined: %x", (u_int) ext.rtp_ext_app);
+		offset += 2;
+		proto_tree_add_text(rtp_tree, offset, 2,
+			"Extension length: %u", (u_int) ext.rtp_ext_length);
+		offset += 2;
+		proto_tree_add_text(rtp_tree, offset, 4 * ext.rtp_ext_length,
+			"Extension Data (%d bytes)",
+			(int) 4 * ext.rtp_ext_length);
+		offset += 4 * ext.rtp_ext_length;
+	}
+
+	proto_tree_add_text(rtp_tree, offset, END_OF_FRAME,
+		"Data (%d bytes)", END_OF_FRAME);
+
+	return;
+
+bad_len:
+	proto_tree_add_text(rtp_tree, end_offset, 0,
+		"Unexpected end of packet");
+}
+
+void
+proto_register_rtp(void)
+{
+/*        static hf_register_info hf[] = {
+                { &variable,
+                { "Name",           "rtp.abbreviation", TYPE, VALS_POINTER }},
+        };*/
+	static gint *ett[] = {
+		&ett_rtp,
+	};
+
+	proto_rtp = proto_register_protocol("Realtime Transport Protocol", "rtp");
+ /*       proto_register_field_array(proto_rtp, hf, array_length(hf));*/
+	proto_register_subtree_array(ett, array_length(ett));
+}