/********************************************************************* *                 * Filename:      capture.c * Version:       0.1 * Description:   Generate libpcap log files for Ethereal * Status:        Experimental. * Author:        Jan Kiszka * Created at:    Thu Jul 17 16:32:35 PDT 2003 * Modified at:   Thu Jul 17 16:32:35 PDT 2003 * Modified by:   Jean Tourrilhes *  *     Copyright (c) 1999 Jan Kiszka, All Rights Reserved. *      *     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 <stdlib.h>#include <stdio.h>#include <string.h>#include <stdlib.h>		/* exit */#include <unistd.h>		/* write */#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include "netbuf.h"#include "capture.h"#include <netpacket/packet.h>#include <linux/types.h>#define SENT_FRAME  0x0100#define RECV_FRAME  0x0101struct pcaprec_hdr {	__u32 ts_sec;	__u32 ts_usec;	__u32 incl_len;	__u32 orig_len;};struct pseudo_hdr {	__u8  not_used1;	__u8  not_used2;	__u16 type;};struct pcap_hdr {	__u32 magic;	__u16 version_major;	__u16 version_minor;	__u32 thiszone;	__u32 sigfigs;	__u32 snaplen;	__u32 network;};struct pcap_hdr fileHeader = {	magic:		0xa1b2c3d4,	version_major:	2,	version_minor:	0,	thiszone:	0,	sigfigs:	0,	snaplen:	2050 + sizeof(struct pseudo_hdr),	network:	123};/* * Function capture_open () * *    Open capture file and return its fd * */int capture_open(char *	capfilename){	int capturefile;	/* Open the capture file */	capturefile = open(capfilename, O_WRONLY | O_CREAT | O_TRUNC, 00640);	if (capturefile < 0)		perror("Opening capture file");	return capturefile;}/* * Function capture_close () * *    Close capture file if needed * */void capture_close(int capturefile){	close(capturefile);}/* * Function capture_init () * *    Write capture header in file * */int capture_init(int capturefile){	/* Write capture file header */	if (write(capturefile, &fileHeader, sizeof(struct pcap_hdr)) < 0)		return -1;	return 0;}/* * Function capture_dump () * *    Write capture header in file * */int capture_dump(int capturefile,		 GNetBuf *frame_buf,		 int len,		 struct sockaddr_ll *from,		 struct timeval *curr_time){	struct pcaprec_hdr rec_hdr;	struct pseudo_hdr  psd_hdr;	rec_hdr.ts_sec    = curr_time->tv_sec;	rec_hdr.ts_usec   = curr_time->tv_usec;	rec_hdr.orig_len  = len + sizeof(psd_hdr);	rec_hdr.incl_len  = rec_hdr.orig_len;	psd_hdr.not_used1 = 0;	psd_hdr.not_used1 = 0;	psd_hdr.type      = (from->sll_pkttype) ? SENT_FRAME : RECV_FRAME;	if ((write(capturefile, &rec_hdr,			sizeof(rec_hdr)) < 0) ||		(write(capturefile, &psd_hdr,			sizeof(psd_hdr)) < 0) ||		(write(capturefile, frame_buf->head, len) < 0)) {		perror("write capture file");		exit(-1);	}	return 0;}