326 lines
7.5 KiB
C
326 lines
7.5 KiB
C
/* packet-rtsp.c
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* Routines for RTSP packet disassembly (RFC 2326)
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*
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* Jason Lango <jal@netapp.com>
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* Liberally copied from packet-http.c, by Guy Harris <guy@alum.mit.edu>
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*
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* $Id: packet-rtsp.c,v 1.7 2000/01/22 06:22:17 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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*
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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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*
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*/
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#include "config.h"
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#include <string.h>
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#include <ctype.h>
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#include <glib.h>
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#include "packet.h"
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static int proto_rtsp = -1;
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static gint ett_rtsp = -1;
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static int hf_rtsp_method = -1;
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static int hf_rtsp_url = -1;
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static int hf_rtsp_status = -1;
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static int process_rtsp_request_or_reply(const u_char *data, int offset,
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int linelen, proto_tree *tree);
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static int
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is_content_sdp(const u_char *line, int linelen)
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{
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const char *hdr = "Content-Type:";
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size_t hdrlen = strlen(hdr);
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const char *type = "application/sdp";
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size_t typelen = strlen(type);
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if (linelen < hdrlen || strncasecmp(hdr, line, hdrlen))
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return 0;
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line += hdrlen;
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linelen -= hdrlen;
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while (linelen > 0 && (*line == ' ' || *line == '\t')) {
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line++;
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linelen--;
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}
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if (linelen < typelen || strncasecmp(type, line, typelen))
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return 0;
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line += typelen;
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linelen -= typelen;
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if (linelen > 0 && !isspace(*line))
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return 0;
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return 1;
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}
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void dissect_rtsp(const u_char *pd, int offset, frame_data *fd,
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proto_tree *tree)
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{
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proto_tree *rtsp_tree;
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proto_item *ti;
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const u_char *data, *dataend;
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const u_char *linep, *lineend, *eol;
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int linelen;
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u_char c;
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int is_sdp = 0;
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int end_offset;
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data = &pd[offset];
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dataend = data + END_OF_FRAME;
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end_offset = offset + END_OF_FRAME;
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rtsp_tree = NULL;
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if (tree) {
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ti = proto_tree_add_item(tree, proto_rtsp, offset,
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END_OF_FRAME, NULL);
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rtsp_tree = proto_item_add_subtree(ti, ett_rtsp);
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}
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if (check_col(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, "RTSP");
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if (check_col(fd, 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 an RTSP request or reply. Otherwise, just call
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* it a continuation.
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*/
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lineend = find_line_end(data, dataend, &eol);
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linelen = lineend - data;
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if (process_rtsp_request_or_reply(data, offset, linelen,
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rtsp_tree))
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col_add_str(fd, COL_INFO, format_text(data, linelen));
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else
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col_add_str(fd, COL_INFO, "Continuation");
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}
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if (!rtsp_tree)
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return;
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if (offset >= end_offset)
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goto bad_len;
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while (data < dataend) {
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/*
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* Find the end of the line.
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*/
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lineend = find_line_end(data, dataend, &eol);
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linelen = lineend - data;
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/*
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* OK, does it look like an RTSP request or
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* response?
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*/
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if (process_rtsp_request_or_reply(data, offset, linelen,
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rtsp_tree))
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goto is_rtsp;
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/*
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* No. Does it look like a blank line (as would
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* appear at the end of an RTSP request)?
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*/
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if (linelen == 1) {
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if (*data == '\n')
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goto is_rtsp;
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}
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if (linelen == 2) {
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if (strncmp(data, "\r\n", 2) == 0 ||
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strncmp(data, "\n\r", 2) == 0)
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goto is_rtsp;
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}
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/*
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* No. Does it look like a MIME header?
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*/
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linep = data;
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while (linep < lineend) {
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c = *linep++;
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if (!isprint(c))
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break; /* not printable, not a MIME header */
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switch (c) {
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case '(':
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case ')':
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case '<':
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case '>':
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case '@':
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case ',':
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case ';':
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case '\\':
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case '"':
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case '/':
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case '[':
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case ']':
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case '?':
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case '=':
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case '{':
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case '}':
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/*
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* It's a tspecial, so it's not
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* part of a token, so it's not
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* a field name for the beginning
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* of a MIME header.
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*/
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goto not_rtsp;
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case ':':
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/*
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* This ends the token; we consider
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* this to be a MIME header.
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*/
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if (is_content_sdp(data, linelen))
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is_sdp = 1;
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goto is_rtsp;
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}
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}
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not_rtsp:
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/*
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* We don't consider this part of an RTSP request or
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* reply, so we don't display it.
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*/
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break;
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is_rtsp:
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/*
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* Put this line.
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*/
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proto_tree_add_text(rtsp_tree, offset, linelen, "%s",
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format_text(data, linelen));
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offset += linelen;
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data = lineend;
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}
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if (is_sdp) {
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dissect_sdp(pd, offset, fd, tree);
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if (check_col(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, "RTSP/SDP");
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}
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else if (data < dataend) {
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proto_tree_add_text(rtsp_tree, offset, END_OF_FRAME,
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"Data (%d bytes)", END_OF_FRAME);
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}
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return;
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bad_len:
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proto_tree_add_text(rtsp_tree, end_offset, 0,
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"Unexpected end of packet");
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}
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const char *rtsp_methods[] = {
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"DESCRIBE", "ANNOUNCE", "GET_PARAMETER", "OPTIONS",
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"PAUSE", "PLAY", "RECORD", "REDIRECT", "SETUP",
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"SET_PARAMETER", "TEARDOWN"
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};
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const int rtsp_nmethods = sizeof(rtsp_methods) / sizeof(*rtsp_methods);
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static int
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process_rtsp_request_or_reply(const u_char *data, int offset, int linelen,
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proto_tree *tree)
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{
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int ii;
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const u_char *lineend = data + linelen;
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/* Reply */
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if (linelen >= 5 && !strncasecmp("RTSP/", data, 5)) {
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if (tree) {
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/* status code */
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const u_char *status = data;
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const u_char *status_start;
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unsigned int status_i = 0;
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while (status < lineend && !isspace(*status))
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status++;
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while (status < lineend && isspace(*status))
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status++;
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status_start = status;
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while (status < lineend && isdigit(*status))
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status_i = status_i * 10 + *status++ - '0';
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proto_tree_add_item_hidden(tree, hf_rtsp_status,
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offset + (status_start - data),
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status - status_start, status_i);
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}
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return TRUE;
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}
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/* Request Methods */
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for (ii = 0; ii < rtsp_nmethods; ii++) {
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size_t len = strlen(rtsp_methods[ii]);
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if (linelen >= len && !strncasecmp(rtsp_methods[ii], data, len))
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break;
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}
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if (ii == rtsp_nmethods)
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return FALSE;
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if (tree) {
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const u_char *url;
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const u_char *url_start;
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u_char *tmp_url;
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/* method name */
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proto_tree_add_item_hidden(tree, hf_rtsp_method, offset,
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strlen(rtsp_methods[ii]), rtsp_methods[ii]);
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/* URL */
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url = data;
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while (url < lineend && !isspace(*url))
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url++;
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while (url < lineend && isspace(*url))
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url++;
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url_start = url;
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while (url < lineend && !isspace(*url))
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url++;
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tmp_url = g_malloc(url - url_start + 1);
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memcpy(tmp_url, url_start, url - url_start);
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tmp_url[url - url_start] = 0;
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proto_tree_add_item_hidden(tree, hf_rtsp_url,
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offset + (url_start - data), url - url_start, tmp_url);
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g_free(tmp_url);
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}
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return TRUE;
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}
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void
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proto_register_rtsp(void)
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{
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static gint *ett[] = {
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&ett_rtsp,
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};
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static hf_register_info hf[] = {
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{ &hf_rtsp_method,
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{ "Method", "rtsp.method", FT_STRING, BASE_NONE, NULL, 0 }},
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{ &hf_rtsp_url,
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{ "URL", "rtsp.url", FT_STRING, BASE_NONE, NULL, 0 }},
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{ &hf_rtsp_status,
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{ "Status", "rtsp.status", FT_UINT32, BASE_DEC, NULL, 0 }},
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};
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proto_rtsp = proto_register_protocol("Real Time Streaming Protocol",
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"rtsp");
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proto_register_field_array(proto_rtsp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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