Add support for RTSP (RFC 2326) over TCP, and SDP (RFC 2327) inside

RTSP, from Jason Lango <jal@netapp.com>.

svn path=/trunk/; revision=340

1 files changed, 241 insertions, 0 deletions

diff --git a/packet-rtsp.c b/packet-rtsp.c
new file mode 100644
index 0000000000..785d17b39a
--- /dev/null
+++ b/packet-rtsp.c
@@ -0,0 +1,241 @@
+/* packet-rtsp.c
+ * Routines for RTSP packet disassembly
+ *
+ * Jason Lango <jal@netapp.com>
+ * Liberally copied from packet-http.c, by Guy Harris <guy@netapp.com>
+ *
+ * $Id: packet-rtsp.c,v 1.1 1999/07/07 00:34:56 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
+
+#include <string.h>
+#include <ctype.h>
+
+#include <glib.h>
+#include "packet.h"
+
+static int is_rtsp_request_or_reply(const u_char *data, int linelen);
+
+static int
+is_content_sdp(const u_char *line, int linelen)
+{
+	const char	*hdr = "Content-Type:";
+	size_t		hdrlen = strlen(hdr);
+	const char	*type = "application/sdp";
+	size_t		typelen = strlen(type);
+
+	if (linelen < hdrlen || strncasecmp(hdr, line, hdrlen))
+		return 0;
+
+	line += hdrlen;
+	linelen -= hdrlen;
+	while (linelen > 0 && (*line == ' ' || *line == '\t')) {
+		line++;
+		linelen--;
+	}
+
+	if (linelen < typelen || strncasecmp(type, line, typelen))
+		return 0;
+
+	line += typelen;
+	linelen -= typelen;
+	if (linelen > 0 && !isspace(*line))
+		return 0;
+
+	return 1;
+}
+
+void dissect_rtsp(const u_char *pd, int offset, frame_data *fd,
+	proto_tree *tree)
+{
+	proto_tree	*rtsp_tree;
+	proto_item	*ti;
+	const u_char	*data, *dataend;
+	const u_char	*linep, *lineend, *eol;
+	int		linelen;
+	u_char		c;
+	int		is_sdp = 0;
+
+	data = &pd[offset];
+	dataend = data + END_OF_FRAME;
+
+	if (check_col(fd, COL_PROTOCOL))
+		col_add_str(fd, COL_PROTOCOL, "RTSP");
+	if (check_col(fd, COL_INFO)) {
+		/*
+		 * Put the first line from the buffer into the summary,
+		 * if it's an RTSP request or reply.
+		 * Otherwise, just call it a continuation.
+		 */
+		lineend = find_line_end(data, dataend, &eol);
+		linelen = lineend - data;
+		if (is_rtsp_request_or_reply(data, linelen))
+			col_add_str(fd, COL_INFO, format_text(data, linelen));
+		else
+			col_add_str(fd, COL_INFO, "Continuation");
+	}
+
+	rtsp_tree = NULL;
+
+	if (tree) {
+		ti = proto_tree_add_item(tree, offset, END_OF_FRAME,
+			"Real Time Streaming Protocol");
+		rtsp_tree = proto_tree_new();
+		proto_item_add_subtree(ti, rtsp_tree, ETT_RTSP);
+	}
+
+	while (data < dataend) {
+		/*
+		 * Find the end of the line.
+		 */
+		lineend = find_line_end(data, dataend, &eol);
+		linelen = lineend - data;
+
+		/*
+		 * OK, does it look like an RTSP request or
+		 * response?
+		 */
+		if (is_rtsp_request_or_reply(data, linelen))
+			goto is_rtsp;
+
+		/*
+		 * No.  Does it look like a blank line (as would
+		 * appear at the end of an RTSP request)?
+		 */
+		if (linelen == 1) {
+			if (*data == '\n')
+				goto is_rtsp;
+		}
+		if (linelen == 2) {
+			if (strncmp(data, "\r\n", 2) == 0 ||
+			    strncmp(data, "\n\r", 2) == 0)
+				goto is_rtsp;
+		}
+
+		/*
+		 * No.  Does it look like a MIME header?
+		 */
+		linep = data;
+		while (linep < lineend) {
+			c = *linep++;
+			if (!isprint(c))
+				break;	/* not printable, not a MIME header */
+			switch (c) {
+
+			case '(':
+			case ')':
+			case '<':
+			case '>':
+			case '@':
+			case ',':
+			case ';':
+			case '\\':
+			case '"':
+			case '/':
+			case '[':
+			case ']':
+			case '?':
+			case '=':
+			case '{':
+			case '}':
+				/*
+				 * It's a tspecial, so it's not
+				 * part of a token, so it's not
+				 * a field name for the beginning
+				 * of a MIME header.
+				 */
+				goto not_rtsp;
+
+			case ':':
+				/*
+				 * This ends the token; we consider
+				 * this to be a MIME header.
+				 */
+				if (is_content_sdp(data, linelen))
+					is_sdp = 1;
+				goto is_rtsp;
+			}
+		}
+
+	not_rtsp:
+		/*
+		 * We don't consider this part of an RTSP request or
+		 * reply, so we don't display it.
+		 */
+		break;
+
+	is_rtsp:
+		/*
+		 * Put this line.
+		 */
+		if (rtsp_tree) {
+			proto_tree_add_item(rtsp_tree, offset, linelen, "%s",
+			    format_text(data, linelen));
+		}
+		offset += linelen;
+		data = lineend;
+	}
+
+	if (is_sdp) {
+		dissect_sdp(pd, offset, fd, tree);
+		if (check_col(fd, COL_PROTOCOL))
+			col_add_str(fd, COL_PROTOCOL, "RTSP/SDP");
+	}
+	else if (rtsp_tree && data < dataend) {
+		proto_tree_add_item(rtsp_tree, offset, END_OF_FRAME,
+		    "Data (%d bytes)", END_OF_FRAME);
+	}
+}
+
+const char *rtsp_methods[] = {
+	"DESCRIBE", "ANNOUNCE", "GET_PARAMETER", "OPTIONS",
+	"PAUSE", "PLAY", "RECORD", "REDIRECT", "SETUP",
+	"SET_PARAMETER", "TEARDOWN"
+};
+const int rtsp_nmethods = sizeof(rtsp_methods) / sizeof(*rtsp_methods);
+
+static int
+is_rtsp_request_or_reply(const u_char *data, int linelen)
+{
+	int		ii;
+	size_t		len;
+
+	/* Reply */
+	if (linelen >= 5 && !strncasecmp("RTSP/", data, 5))
+		return TRUE;
+
+	/* Request Methods */
+	for (ii = 0; ii < rtsp_nmethods; ii++) {
+		len = strlen(rtsp_methods[ii]);
+		if (linelen >= len && !strncasecmp(rtsp_methods[ii], data, len))
+			return TRUE;
+	}
+
+	return FALSE;
+}