forked from osmocom/wireshark
07eb30403d
Add "tvb_find_line_end_unquoted()" for the benefit of the SDP dissector; get rid of "find_line_end_unquoted()" as nobody uses it any more. Add "tvb_pbrk_guint8()" for the benefit of "tvb_find_line_end_unquoted()"; it searches for any of a number of characters, unlike "tvb_find_guint8()" which searches for only one. svn path=/trunk/; revision=2595
469 lines
11 KiB
C
469 lines
11 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 1.23 2000/11/10 06:50:36 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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#include "packet-sdp.h"
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#include "packet-rtp.h"
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#include "packet-rtcp.h"
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#include "conversation.h"
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#include "strutil.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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#define TCP_PORT_RTSP 554
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static void process_rtsp_request(tvbuff_t *tvb, int offset, const u_char *data,
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int linelen, proto_tree *tree);
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static void process_rtsp_reply(tvbuff_t *tvb, int offset, const u_char *data,
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int linelen, proto_tree *tree);
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typedef enum {
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RTSP_REQUEST,
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RTSP_REPLY,
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NOT_RTSP
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} rtsp_type_t;
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static 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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#define RTSP_NMETHODS (sizeof rtsp_methods / sizeof rtsp_methods[0])
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static rtsp_type_t
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is_rtsp_request_or_reply(const u_char *line, int linelen)
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{
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int ii;
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/* Is this an RTSP reply? */
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if (linelen >= 5 && strncasecmp("RTSP/", line, 5) == 0) {
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/*
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* Yes.
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*/
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return RTSP_REPLY;
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}
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/*
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* Is this an RTSP request?
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* Check whether the line begins with one of the RTSP request
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* methods.
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*/
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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 &&
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strncasecmp(rtsp_methods[ii], line, len) == 0)
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return RTSP_REQUEST;
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}
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return NOT_RTSP;
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}
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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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static const char rtsp_transport[] = "Transport:";
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static const char rtsp_sps[] = "server_port=";
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static const char rtsp_cps[] = "client_port=";
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static const char rtsp_rtp[] = "rtp/avp";
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static void
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rtsp_create_conversation(const u_char *trans_begin, const u_char *trans_end)
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{
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conversation_t *conv;
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u_char tbuf[256];
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u_char *tmp;
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int c_data_port, c_mon_port;
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int s_data_port, s_mon_port;
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strncpy(tbuf, trans_begin, trans_end - trans_begin);
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tbuf[sizeof(tbuf)-1] = 0;
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tmp = tbuf + strlen(rtsp_transport);
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while (*tmp && isspace(*tmp))
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tmp++;
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if (strncasecmp(tmp, rtsp_rtp, strlen(rtsp_rtp)) != 0)
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return;
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c_data_port = c_mon_port = 0;
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s_data_port = s_mon_port = 0;
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if ((tmp = strstr(tbuf, rtsp_sps))) {
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tmp += strlen(rtsp_sps);
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if (sscanf(tmp, "%u-%u", &s_data_port, &s_mon_port) < 1)
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g_warning("rtsp: failed to parse server_port");
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}
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if ((tmp = strstr(tbuf, rtsp_cps))) {
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tmp += strlen(rtsp_cps);
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if (sscanf(tmp, "%u-%u", &c_data_port, &c_mon_port) < 1)
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g_warning("rtsp: failed to parse client_port");
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}
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if (!c_data_port || !s_data_port)
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return;
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conv = conversation_new(&pi.src, &pi.dst, PT_UDP, s_data_port,
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c_data_port, 0, 0);
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conversation_set_dissector(conv, dissect_rtp);
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if (!c_mon_port || !s_mon_port)
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return;
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conv = conversation_new(&pi.src, &pi.dst, PT_UDP, s_mon_port,
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c_mon_port, 0, 0);
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conversation_set_dissector(conv, dissect_rtcp);
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}
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static void
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dissect_rtsp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *rtsp_tree;
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proto_item *ti = NULL;
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gint offset = 0;
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const u_char *line;
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gint next_offset;
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const u_char *linep, *lineend;
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int linelen;
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u_char c;
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int is_sdp = FALSE;
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int datalen;
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CHECK_DISPLAY_AS_DATA(proto_rtsp, tvb, pinfo, tree);
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pinfo->current_proto = "RTSP";
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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, tvb, offset,
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tvb_length_remaining(tvb, offset), FALSE);
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rtsp_tree = proto_item_add_subtree(ti, ett_rtsp);
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}
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if (check_col(pinfo->fd, COL_PROTOCOL))
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col_add_str(pinfo->fd, COL_PROTOCOL, "RTSP");
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if (check_col(pinfo->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 (but leave out the
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* line terminator).
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* Otherwise, just call it a continuation.
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*/
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linelen = tvb_find_line_end(tvb, offset, -1, &next_offset);
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line = tvb_get_ptr(tvb, offset, linelen);
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switch (is_rtsp_request_or_reply(line, linelen)) {
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case RTSP_REQUEST:
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case RTSP_REPLY:
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col_add_str(pinfo->fd, COL_INFO,
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format_text(line, linelen));
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break;
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default:
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col_add_str(pinfo->fd, COL_INFO, "Continuation");
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break;
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}
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}
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/*
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* Process the packet data, a line at a time.
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*/
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while (tvb_length_remaining(tvb, offset)) {
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/*
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* Find the end of the line.
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*/
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linelen = tvb_find_line_end(tvb, offset, -1, &next_offset);
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/*
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* Get a buffer that refers to the line.
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*/
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line = tvb_get_ptr(tvb, offset, linelen);
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lineend = line + linelen;
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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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switch (is_rtsp_request_or_reply(line, linelen)) {
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case RTSP_REQUEST:
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if (rtsp_tree != NULL)
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process_rtsp_request(tvb, offset, line, linelen,
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rtsp_tree);
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goto is_rtsp;
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case RTSP_REPLY:
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if (rtsp_tree != NULL)
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process_rtsp_reply(tvb, offset, line, linelen,
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rtsp_tree);
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goto is_rtsp;
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case NOT_RTSP:
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break;
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}
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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 == 0)
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goto is_rtsp; /* Yes. */
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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 = line;
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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(line, linelen))
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is_sdp = TRUE;
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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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if (rtsp_tree) {
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proto_tree_add_text(rtsp_tree, tvb, offset,
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next_offset - offset, "%s",
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tvb_format_text(tvb, offset, next_offset - offset));
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}
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if (linelen > strlen(rtsp_transport) &&
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strncasecmp(line, rtsp_transport,
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strlen(rtsp_transport)) == 0)
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rtsp_create_conversation(line, line + linelen);
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offset = next_offset;
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}
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datalen = tvb_length_remaining(tvb, offset);
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if (is_sdp) {
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if (datalen > 0) {
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tvbuff_t *new_tvb;
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/*
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* Fix up the top-level item so that it doesn't
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* include the SDP stuff.
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*/
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if (ti != NULL)
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proto_item_set_len(ti, offset);
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/*
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* Now creat a tvbuff for the SDP stuff and
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* dissect it.
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*/
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new_tvb = tvb_new_subset(tvb, offset, -1, -1);
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dissect_sdp(new_tvb, pinfo, tree);
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}
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if (check_col(pinfo->fd, COL_PROTOCOL))
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col_add_str(pinfo->fd, COL_PROTOCOL, "RTSP/SDP");
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} else {
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if (datalen > 0) {
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proto_tree_add_text(rtsp_tree, tvb, offset, datalen,
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"Data (%d bytes)", datalen);
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}
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}
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}
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static void
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process_rtsp_request(tvbuff_t *tvb, int offset, const u_char *data,
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int linelen, proto_tree *tree)
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{
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const u_char *lineend = data + linelen;
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int ii;
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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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/* 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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/*
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* We got here because "is_rtsp_request_or_reply()" returned
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* RTSP_REQUEST, so we know one of the request methods
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* matched, so we "can't get here".
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*/
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g_assert_not_reached();
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}
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/* Method name */
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proto_tree_add_string_hidden(tree, hf_rtsp_method, tvb, 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_string_hidden(tree, hf_rtsp_url, tvb,
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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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static void
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process_rtsp_reply(tvbuff_t *tvb, int offset, const u_char *data,
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int linelen, proto_tree *tree)
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{
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const u_char *lineend = data + linelen;
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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;
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/* status code */
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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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status_i = 0;
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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_uint_hidden(tree, hf_rtsp_status, tvb,
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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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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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void
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proto_reg_handoff_rtsp(void)
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{
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dissector_add("tcp.port", TCP_PORT_RTSP, dissect_rtsp);
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}
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