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/* wtap.c
*
* $Id: wtap.c,v 1.7 1999/03/01 18:57:07 gram Exp $
*
* Wiretap Library
* Copyright (c) 1998 by Gilbert Ramirez <gram@verdict.uthscsa.edu>
*
* 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 "wtap.h"
#include "buffer.h"
#include "bpf-engine.h"
#include "rt-compile.h"
FILE* wtap_file(wtap *wth)
{
return wth->fh;
}
int wtap_file_type(wtap *wth)
{
return wth->file_type;
}
int wtap_snapshot_length(wtap *wth)
{
return wth->snapshot_length;
}
void wtap_close(wtap *wth)
{
/* free up memory. If any capture structure ever allocates
* its own memory, it would be better to make a *close() function
* for each filetype, like pcap_close(0, lanalyzer_close(), etc.
* But for now this will work. */
switch(wth->file_type) {
case WTAP_FILE_PCAP:
g_free(wth->capture.pcap);
break;
case WTAP_FILE_LANALYZER:
g_free(wth->capture.lanalyzer);
break;
case WTAP_FILE_NGSNIFFER:
g_free(wth->capture.ngsniffer);
break;
case WTAP_FILE_NETMON:
g_free(wth->capture.netmon);
break;
/* default:
nothing */
}
fclose(wth->fh);
}
void wtap_loop(wtap *wth, int count, wtap_handler callback, u_char* user)
{
int data_offset;
int ret;
int pkt_encap;
while ((data_offset = wth->subtype_read(wth)) > 0) {
/* offline filter? */
if (wth->filter_type == WTAP_FILTER_OFFLINE) {
pkt_encap = wth->phdr.pkt_encap;
/* do we have a compiled filter for this
* encapsulation type? */
if (!wth->filter.offline[pkt_encap])
wtap_offline_filter_compile(wth, pkt_encap);
/* run the filter */
ret = bpf_run_filter(
buffer_start_ptr(wth->frame_buffer),
wth->phdr.caplen,
wth->filter.offline[pkt_encap],
wth->offline_filter_lengths[pkt_encap]
);
/* if the packet made it through the filter,
* send the data to the user */
if (ret > 0)
callback(user, &wth->phdr, data_offset,
buffer_start_ptr(wth->frame_buffer));
}
else
callback(user, &wth->phdr, data_offset,
buffer_start_ptr(wth->frame_buffer));
}
}
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