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wireshark/gtk/rtp_stream.c
Guy Harris 2cbb8e33e2 Immediately quit routines if fwrite() fails - further writes will 
probably fail (as you're probably out of disk space or over quota), and,
even if they don't, the file's going to be corrupt in any case.

(Hopefully that's sufficient to avoid warnings that we're ignoring the
result of fwrite().)

For fread(), check for errors or short reads, at least in all cases
where we have a provision for failing if the read fails.

svn path=/trunk/; revision=21649
2007-05-02 19:28:24 +00:00

464 lines
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/* rtp_stream.c
* RTP streams summary addition for Wireshark
*
* $Id$
*
* Copyright 2003, Alcatel Business Systems
* By Lars Ruoff <lars.ruoff@gmx.net>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "globals.h"
#include <epan/tap.h>
#include "register.h"
#include <epan/dissectors/packet-rtp.h>
#include "alert_box.h"
#include "simple_dialog.h"
#include "file_util.h"
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#include <string.h>
#include <epan/addr_resolv.h>
#include "rtp_stream.h"
#include "rtp_stream_dlg.h"
/****************************************************************************/
/* the one and only global rtpstream_tapinfo_t structure */
static rtpstream_tapinfo_t the_tapinfo_struct =
{0, NULL, 0, TAP_ANALYSE, NULL, NULL, NULL, 0, FALSE};
/****************************************************************************/
/* GCompareFunc style comparison function for _rtp_stream_info */
static gint rtp_stream_info_cmp(gconstpointer aa, gconstpointer bb)
{
const struct _rtp_stream_info* a = aa;
const struct _rtp_stream_info* b = bb;
if (a==b)
return 0;
if (a==NULL || b==NULL)
return 1;
if (ADDRESSES_EQUAL(&(a->src_addr), &(b->src_addr))
&& (a->src_port == b->src_port)
&& ADDRESSES_EQUAL(&(a->dest_addr), &(b->dest_addr))
&& (a->dest_port == b->dest_port)
&& (a->ssrc == b->ssrc))
return 0;
else
return 1;
}
/****************************************************************************/
/* when there is a [re]reading of packet's */
void rtpstream_reset(rtpstream_tapinfo_t *tapinfo)
{
GList* list;
if (tapinfo->mode == TAP_ANALYSE) {
/* free the data items first */
list = g_list_first(tapinfo->strinfo_list);
while (list)
{
g_free(list->data);
list = g_list_next(list);
}
g_list_free(tapinfo->strinfo_list);
tapinfo->strinfo_list = NULL;
tapinfo->nstreams = 0;
tapinfo->npackets = 0;
}
++(tapinfo->launch_count);
return;
}
static void rtpstream_reset_cb(void *arg)
{
rtpstream_reset(arg);
}
/****************************************************************************/
/* redraw the output */
static void rtpstream_draw(void *arg _U_)
{
/* XXX: see rtpstream_on_update in rtp_streams_dlg.c for comments
gtk_signal_emit_by_name(top_level, "signal_rtpstream_update");
*/
rtpstream_dlg_update(the_tapinfo_struct.strinfo_list);
return;
}
/*
* rtpdump file format
*
* The file starts with the tool to be used for playing this file,
* the multicast/unicast receive address and the port.
*
* #!rtpplay1.0 224.2.0.1/3456\n
*
* This is followed by one binary header (RD_hdr_t) and one RD_packet_t
* structure for each received packet. All fields are in network byte
* order. We don't need the source IP address since we can do mapping
* based on SSRC. This saves (a little) space, avoids non-IPv4
* problems and privacy/security concerns. The header is followed by
* the RTP/RTCP header and (optionally) the actual payload.
*/
#define RTPFILE_VERSION "1.0"
/*
* Write a header to the current output file.
* The header consists of an identifying string, followed
* by a binary structure.
*/
static void rtp_write_header(rtp_stream_info_t *strinfo, FILE *file)
{
guint32 start_sec; /* start of recording (GMT) (seconds) */
guint32 start_usec; /* start of recording (GMT) (microseconds)*/
guint32 source; /* network source (multicast address) */
size_t sourcelen;
guint16 port; /* UDP port */
guint16 padding; /* 2 padding bytes */
fprintf(file, "#!rtpplay%s %s/%u\n", RTPFILE_VERSION,
get_addr_name(&(strinfo->dest_addr)),
strinfo->dest_port);
start_sec = g_htonl(strinfo->start_sec);
start_usec = g_htonl(strinfo->start_usec);
/* rtpdump only accepts guint32 as source, will be fake for IPv6 */
memset(&source, 0, sizeof source);
sourcelen = strinfo->src_addr.len;
if (sourcelen > sizeof source)
sourcelen = sizeof source;
memcpy(&source, strinfo->src_addr.data, sourcelen);
port = g_htons(strinfo->src_port);
padding = 0;
if (fwrite(&start_sec, 4, 1, file) == 0)
return;
if (fwrite(&start_usec, 4, 1, file) == 0)
return;
if (fwrite(&source, 4, 1, file) == 0)
return;
if (fwrite(&port, 2, 1, file) == 0)
return;
if (fwrite(&padding, 2, 1, file) == 0)
return;
}
/* utility function for writing a sample to file in rtpdump -F dump format (.rtp)*/
static void rtp_write_sample(rtp_sample_t* sample, FILE* file)
{
guint16 length; /* length of packet, including this header (may
be smaller than plen if not whole packet recorded) */
guint16 plen; /* actual header+payload length for RTP, 0 for RTCP */
guint32 offset; /* milliseconds since the start of recording */
length = g_htons(sample->header.frame_length + 8);
plen = g_htons(sample->header.frame_length);
offset = g_htonl(sample->header.rec_time);
if (fwrite(&length, 2, 1, file) == 0)
return;
if (fwrite(&plen, 2, 1, file) == 0)
return;
if (fwrite(&offset, 4, 1, file) == 0)
return;
if (fwrite(sample->frame, sample->header.frame_length, 1, file) == 0)
return;
}
/****************************************************************************/
/* whenever a RTP packet is seen by the tap listener */
static int rtpstream_packet(void *arg, packet_info *pinfo, epan_dissect_t *edt _U_, const void *arg2)
{
rtpstream_tapinfo_t *tapinfo = arg;
const struct _rtp_info *rtpinfo = arg2;
rtp_stream_info_t tmp_strinfo;
rtp_stream_info_t *strinfo = NULL;
GList* list;
rtp_sample_t sample;
struct _rtp_conversation_info *p_conv_data = NULL;
/* gather infos on the stream this packet is part of */
COPY_ADDRESS(&(tmp_strinfo.src_addr), &(pinfo->src));
tmp_strinfo.src_port = pinfo->srcport;
COPY_ADDRESS(&(tmp_strinfo.dest_addr), &(pinfo->dst));
tmp_strinfo.dest_port = pinfo->destport;
tmp_strinfo.ssrc = rtpinfo->info_sync_src;
tmp_strinfo.pt = rtpinfo->info_payload_type;
tmp_strinfo.info_payload_type_str = rtpinfo->info_payload_type_str;
if (tapinfo->mode == TAP_ANALYSE) {
/* check wether we already have a stream with these parameters in the list */
list = g_list_first(tapinfo->strinfo_list);
while (list)
{
if (rtp_stream_info_cmp(&tmp_strinfo, (rtp_stream_info_t*)(list->data))==0)
{
strinfo = (rtp_stream_info_t*)(list->data); /*found!*/
break;
}
list = g_list_next(list);
}
/* not in the list? then create a new entry */
if (!strinfo) {
tmp_strinfo.npackets = 0;
tmp_strinfo.first_frame_num = pinfo->fd->num;
tmp_strinfo.start_sec = (guint32) pinfo->fd->abs_ts.secs;
tmp_strinfo.start_usec = pinfo->fd->abs_ts.nsecs/1000;
tmp_strinfo.start_rel_sec = (guint32) pinfo->fd->rel_ts.secs;
tmp_strinfo.start_rel_usec = pinfo->fd->rel_ts.nsecs/1000;
tmp_strinfo.tag_vlan_error = 0;
tmp_strinfo.tag_diffserv_error = 0;
tmp_strinfo.vlan_id = 0;
tmp_strinfo.problem = FALSE;
/* reset RTP stats */
tmp_strinfo.rtp_stats.first_packet = TRUE;
tmp_strinfo.rtp_stats.max_delta = 0;
tmp_strinfo.rtp_stats.max_jitter = 0;
tmp_strinfo.rtp_stats.mean_jitter = 0;
tmp_strinfo.rtp_stats.delta = 0;
tmp_strinfo.rtp_stats.diff = 0;
tmp_strinfo.rtp_stats.jitter = 0;
tmp_strinfo.rtp_stats.bandwidth = 0;
tmp_strinfo.rtp_stats.total_bytes = 0;
tmp_strinfo.rtp_stats.bw_start_index = 0;
tmp_strinfo.rtp_stats.bw_index = 0;
tmp_strinfo.rtp_stats.timestamp = 0;
tmp_strinfo.rtp_stats.max_nr = 0;
tmp_strinfo.rtp_stats.total_nr = 0;
tmp_strinfo.rtp_stats.sequence = 0;
tmp_strinfo.rtp_stats.start_seq_nr = 0;
tmp_strinfo.rtp_stats.stop_seq_nr = 0;
tmp_strinfo.rtp_stats.cycles = 0;
tmp_strinfo.rtp_stats.under = FALSE;
tmp_strinfo.rtp_stats.start_time = 0;
tmp_strinfo.rtp_stats.time = 0;
tmp_strinfo.rtp_stats.reg_pt = PT_UNDEFINED;
/* Get the Setup frame number who set this RTP stream */
p_conv_data = p_get_proto_data(pinfo->fd, proto_get_id_by_filter_name("rtp"));
if (p_conv_data)
tmp_strinfo.setup_frame_number = p_conv_data->frame_number;
else
tmp_strinfo.setup_frame_number = 0xFFFFFFFF;
strinfo = g_malloc(sizeof(rtp_stream_info_t));
*strinfo = tmp_strinfo; /* memberwise copy of struct */
tapinfo->strinfo_list = g_list_append(tapinfo->strinfo_list, strinfo);
}
/* get RTP stats for the packet */
rtp_packet_analyse(&(strinfo->rtp_stats), pinfo, rtpinfo);
if (strinfo->rtp_stats.flags & STAT_FLAG_WRONG_TIMESTAMP
|| strinfo->rtp_stats.flags & STAT_FLAG_WRONG_SEQ)
strinfo->problem = TRUE;
/* increment the packets counter for this stream */
++(strinfo->npackets);
strinfo->stop_rel_sec = (guint32) pinfo->fd->rel_ts.secs;
strinfo->stop_rel_usec = pinfo->fd->rel_ts.nsecs/1000;
/* increment the packets counter of all streams */
++(tapinfo->npackets);
return 1; /* refresh output */
}
else if (tapinfo->mode == TAP_SAVE) {
if (rtp_stream_info_cmp(&tmp_strinfo, tapinfo->filter_stream_fwd)==0) {
/* XXX - what if rtpinfo->info_all_data_present is
FALSE, so that we don't *have* all the data? */
sample.header.rec_time =
(pinfo->fd->abs_ts.nsecs/1000 + 1000000 - tapinfo->filter_stream_fwd->start_usec)/1000
+ (guint32) (pinfo->fd->abs_ts.secs - tapinfo->filter_stream_fwd->start_sec - 1)*1000;
sample.header.frame_length = rtpinfo->info_data_len;
sample.frame = rtpinfo->info_data;
rtp_write_sample(&sample, tapinfo->save_file);
}
}
else if (tapinfo->mode == TAP_MARK) {
if (rtp_stream_info_cmp(&tmp_strinfo, tapinfo->filter_stream_fwd)==0
|| rtp_stream_info_cmp(&tmp_strinfo, tapinfo->filter_stream_rev)==0)
{
cf_mark_frame(&cfile, pinfo->fd);
}
}
return 0;
}
/****************************************************************************/
/* scan for RTP streams */
void rtpstream_scan(void)
{
gboolean was_registered = the_tapinfo_struct.is_registered;
if (!the_tapinfo_struct.is_registered)
register_tap_listener_rtp_stream();
the_tapinfo_struct.mode = TAP_ANALYSE;
cf_retap_packets(&cfile, FALSE);
if (!was_registered)
remove_tap_listener_rtp_stream();
}
/****************************************************************************/
/* save rtp dump of stream_fwd */
gboolean rtpstream_save(rtp_stream_info_t* stream, const gchar *filename)
{
gboolean was_registered = the_tapinfo_struct.is_registered;
/* open file for saving */
the_tapinfo_struct.save_file = eth_fopen(filename, "wb");
if (the_tapinfo_struct.save_file==NULL) {
open_failure_alert_box(filename, errno, TRUE);
return FALSE;
}
rtp_write_header(stream, the_tapinfo_struct.save_file);
if (ferror(the_tapinfo_struct.save_file)) {
write_failure_alert_box(filename, errno);
fclose(the_tapinfo_struct.save_file);
return FALSE;
}
if (!the_tapinfo_struct.is_registered)
register_tap_listener_rtp_stream();
the_tapinfo_struct.mode = TAP_SAVE;
the_tapinfo_struct.filter_stream_fwd = stream;
cf_retap_packets(&cfile, FALSE);
the_tapinfo_struct.mode = TAP_ANALYSE;
if (!was_registered)
remove_tap_listener_rtp_stream();
if (ferror(the_tapinfo_struct.save_file)) {
write_failure_alert_box(filename, errno);
fclose(the_tapinfo_struct.save_file);
return FALSE;
}
if (fclose(the_tapinfo_struct.save_file) == EOF) {
write_failure_alert_box(filename, errno);
return FALSE;
}
return TRUE;
}
/****************************************************************************/
/* mark packets in stream_fwd or stream_rev */
void rtpstream_mark(rtp_stream_info_t* stream_fwd, rtp_stream_info_t* stream_rev)
{
gboolean was_registered = the_tapinfo_struct.is_registered;
if (!the_tapinfo_struct.is_registered)
register_tap_listener_rtp_stream();
the_tapinfo_struct.mode = TAP_MARK;
the_tapinfo_struct.filter_stream_fwd = stream_fwd;
the_tapinfo_struct.filter_stream_rev = stream_rev;
cf_retap_packets(&cfile, FALSE);
the_tapinfo_struct.mode = TAP_ANALYSE;
if (!was_registered)
remove_tap_listener_rtp_stream();
}
/****************************************************************************/
const rtpstream_tapinfo_t* rtpstream_get_info(void)
{
return &the_tapinfo_struct;
}
/****************************************************************************/
/* TAP INTERFACE */
/****************************************************************************/
/* XXX just copied from gtk/rpc_stat.c */
void protect_thread_critical_region(void);
void unprotect_thread_critical_region(void);
/****************************************************************************/
void
remove_tap_listener_rtp_stream(void)
{
if (the_tapinfo_struct.is_registered) {
protect_thread_critical_region();
remove_tap_listener(&the_tapinfo_struct);
unprotect_thread_critical_region();
the_tapinfo_struct.is_registered = FALSE;
}
}
/****************************************************************************/
void
register_tap_listener_rtp_stream(void)
{
GString *error_string;
if (!the_tapinfo_struct.is_registered) {
error_string = register_tap_listener("rtp", &the_tapinfo_struct,
NULL, rtpstream_reset_cb, rtpstream_packet,
rtpstream_draw);
if (error_string != NULL) {
simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
error_string->str);
g_string_free(error_string, TRUE);
exit(1);
}
the_tapinfo_struct.is_registered = TRUE;
}
}
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