/*
  *  Copyright (C) 2004 trog@uncon.org
  *
  *  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., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <unistd.h>

 #include <netinet/in.h>

 
 #include "clamav.h"
 #include "others.h"
 
 
 int cli_check_mydoom_log(int desc, const char **virname)
 {
 	int32_t record[8], check;
 	int i, retval=CL_VIRUS, j;
 
     cli_dbgmsg("in cli_check_mydoom_log()\n");
 
     /* Check upto the first five records in the file */
     for (j=0 ; j<5 ; j++) {
 	if (cli_readn(desc, &record, 32) != 32) {
 	    break;
 	}
 
 	/* Decode the key */
 	record[0] = ~ntohl(record[0]);
 	cli_dbgmsg("Mydoom: key: %lu\n", record[0]);
 	check = 0;
 	for (i=1 ; i<8; i++) {
 	    record[i] = ntohl(record[i]) ^ record[0];
 	    check += record[i];
 	}
 	cli_dbgmsg("Mydoom: check: %lu\n", ~check);
 	if ((~check) != record[0]) {
 	    return CL_CLEAN;
 	}
     }
 
     if (j < 2) {
 	retval = CL_CLEAN;
     } else if (retval==CL_VIRUS) {
 	if(virname)
 	    *virname = "Worm.Mydoom.M.log";
     }
 
     return retval;
 }
 
 int cli_check_jpeg_exploit(int fd)
 {
 	unsigned char buffer[4];
 	off_t offset;
 	int retval;

 
 	cli_dbgmsg("in cli_check_jpeg_exploit()\n");
 
 	if (cli_readn(fd, buffer, 2) != 2) {
 		return 0;
 	}

 	if ((buffer[0] != 0xff) || (buffer[1] != 0xd8)) {

 		return 0;
 	}
 	for (;;) {
 		if ((retval=cli_readn(fd, buffer, 4)) != 4) {
 			return 0;
 		}

 		/* Check for multiple 0xFF values, we need to skip them */
 		if ((buffer[0] == 0xff) && (buffer[1] == 0xff)) {
 			lseek(fd, -3, SEEK_CUR);
 			continue;
 		}
 		

 		if ((buffer[0] == 0xff) && (buffer[1] == 0xfe)) {
 			if (buffer[2] == 0x00) {
 				if ((buffer[3] == 0x00) || (buffer[3] == 0x01)) {
 					return 1;
 				}
 			}
 		}
 		if (buffer[0] != 0xff) {
 			return -1;
 		}
 		if (buffer[1] == 0xda) {
 			/* End of Image marker */
 			return 0;
 		}
 		offset = ((unsigned int) buffer[2] << 8) + buffer[3];
 		if (offset < 2) {

 			return 1;

 		}
 		offset -= 2;
 		offset += lseek(fd, 0, SEEK_CUR);
 		if (lseek(fd, offset, SEEK_SET) != offset) {
 			return -1;
 		}
 	}
 }