/*

  *  Copyright (C) 2002 - 2005 Tomasz Kojm <tkojm@clamav.net>

  *
  *  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.
  */
 

 #if HAVE_CONFIG_H
 #include "clamav-config.h"
 #endif
 

 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
 #include <sys/types.h>
 #include <sys/stat.h>

 #include <unistd.h>

 #include <sys/param.h>

 #include <fcntl.h>
 #include <dirent.h>

 #include <netinet/in.h>
 

 #if HAVE_MMAP
 #if HAVE_SYS_MMAN_H
 #include <sys/mman.h>
 #else /* HAVE_SYS_MMAN_H */
 #undef HAVE_MMAP
 #endif
 #endif
 

 #include <mspack.h>
 

 #ifdef CL_THREAD_SAFE
 #  include <pthread.h>
 pthread_mutex_t cli_scanrar_mutex = PTHREAD_MUTEX_INITIALIZER;
 #endif

 int cli_scanrar_inuse = 0;

 extern short cli_leavetemps_flag;
 

 extern int cli_mbox(const char *dir, int desc, unsigned int options); /* FIXME */

 #include "clamav.h"
 #include "others.h"

 #include "scanners.h"

 #include "matcher-ac.h"
 #include "matcher-bm.h"

 #include "matcher.h"
 #include "unrarlib.h"

 #include "ole2_extract.h"
 #include "vba_extract.h"

 #include "msexpand.h"

 #include "chmunpack.h"

 #include "pe.h"

 #include "filetypes.h"
 #include "htmlnorm.h"

 #include "untar.h"

 #include "special.h"

 #include "binhex.h"

 
 #ifdef HAVE_ZLIB_H
 #include <zlib.h>
 #include <zzip.h>
 #endif
 
 #ifdef HAVE_BZLIB_H
 #include <bzlib.h>
 #endif
 

 #if defined(HAVE_READDIR_R_3) || defined(HAVE_READDIR_R_2)
 #include <limits.h>

 #include <stddef.h>

 #endif
 

 /* Maximum filenames under various systems - njh */
 #ifndef	NAME_MAX	/* e.g. Linux */
 # ifdef	MAXNAMELEN	/* e.g. Solaris */
 #   define	NAME_MAX	MAXNAMELEN
 # else
 #   ifdef	FILENAME_MAX	/* e.g. SCO */
 #     define	NAME_MAX	FILENAME_MAX

 #   else
 #     define	NAME_MAX	256

 #   endif
 # endif
 #endif

 #define SCAN_ARCHIVE	    (options & CL_SCAN_ARCHIVE)
 #define SCAN_MAIL	    (options & CL_SCAN_MAIL)
 #define SCAN_OLE2	    (options & CL_SCAN_OLE2)
 #define SCAN_HTML	    (options & CL_SCAN_HTML)
 #define SCAN_PE		    (options & CL_SCAN_PE)
 #define DISABLE_RAR	    (options & CL_SCAN_DISABLERAR)

 #define DETECT_ENCRYPTED    (options & CL_SCAN_BLOCKENCRYPTED)

 #define BLOCKMAX	    (options & CL_SCAN_BLOCKMAX)

 #define MAX_MAIL_RECURSION  15

 static int cli_scanfile(const char *filename, const char **virname, unsigned long int *scanned, const struct cl_node *root, const struct cl_limits *limits, unsigned int options, unsigned int arec, unsigned int mrec);

 #ifdef CL_THREAD_SAFE

 static void cli_unlock_mutex(void *mtx)

 {
     cli_dbgmsg("Pthread cancelled. Unlocking mutex.\n");
     pthread_mutex_unlock(mtx);
 }
 #endif
 

 static int cli_scanrar(int desc, const char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, unsigned int options, unsigned int arec, unsigned int mrec)

 {

 	FILE *tmp = NULL;

 	int fd, ret = CL_CLEAN;
 	unsigned int files = 0, encrypted, afiles;

 	ArchiveList_struct *rarlist = NULL;

 	ArchiveList_struct *rarlist_head = NULL;

 	char *rar_data_ptr;
 	unsigned long rar_data_size;

 	struct cli_meta_node *mdata;

 
     cli_dbgmsg("in scanrar()\n");

 
 #ifdef CL_THREAD_SAFE
     pthread_cleanup_push(cli_unlock_mutex, &cli_scanrar_mutex);
     pthread_mutex_lock(&cli_scanrar_mutex);
     cli_scanrar_inuse = 1;
 #endif
 

     if(!(afiles = urarlib_list(desc, (ArchiveList_struct *) &rarlist))) {

 #ifdef CL_THREAD_SAFE
 	pthread_mutex_unlock(&cli_scanrar_mutex);
 	cli_scanrar_inuse = 0;
 #endif
 	return CL_ERAR;
     }
 

     cli_dbgmsg("RAR: Number of archived files: %d\n", afiles);

     rarlist_head = rarlist;
 

     while(rarlist) {

 
 	files++;
 	encrypted = rarlist->item.Flags & 0x04;
 

 	cli_dbgmsg("RAR: %s, crc32: 0x%x, encrypted: %d, compressed: %u, normal: %u, method: %d, ratio: %d (max: %d)\n", rarlist->item.Name, rarlist->item.FileCRC, encrypted, rarlist->item.PackSize, rarlist->item.UnpSize, rarlist->item.Method, rarlist->item.PackSize ? ((unsigned int) rarlist->item.UnpSize / (unsigned int) rarlist->item.PackSize) : 0, limits ? limits->maxratio : 0);

 
 	/* Scan metadata */
 	mdata = root->rar_mlist;
 	if(mdata) do {
 	    if(mdata->encrypted != encrypted)
 		continue;
 

 	    if(mdata->crc32 && (unsigned int) mdata->crc32 != rarlist->item.FileCRC)

 		continue;
 

 	    if(mdata->csize > 0 && (unsigned int) mdata->csize != rarlist->item.PackSize)

 		continue;
 

 	    if(mdata->size >= 0 && (unsigned int) mdata->size != rarlist->item.UnpSize)

 		continue;
 

 	    if(mdata->method >= 0 && mdata->method != rarlist->item.Method)

 		continue;
 
 	    if(mdata->fileno && mdata->fileno != files)
 		continue;
 

 	    if(mdata->maxdepth && arec > mdata->maxdepth)

 		continue;
 
 	    /* TODO add support for regex */
 	    /*if(mdata->filename && !strstr(zdirent.d_name, mdata->filename))*/
 	    if(mdata->filename && strcmp(rarlist->item.Name, mdata->filename))
 		continue;
 
 	    break; /* matched */
 
 	} while((mdata = mdata->next));
 
 	if(mdata) {
 	    *virname = mdata->virname;
 	    ret = CL_VIRUS;
 	    break;
 	}
 

 	if(DETECT_ENCRYPTED && (rarlist->item.Flags & 0x04)) {

 	    cli_dbgmsg("RAR: Encrypted files found in archive.\n");

 	    lseek(desc, 0, SEEK_SET);

 	    ret = cli_scandesc(desc, virname, scanned, root, 0, 0);
 	    if(ret < 0) {
 		break;
 	    } else if(ret != CL_VIRUS) {

 		*virname = "Encrypted.RAR";

 		ret = CL_VIRUS;
 	    }

 	    break;
 	}

 	if((rarlist->item.Flags & 0x03) != 0) {
 	    cli_dbgmsg("RAR: Skipping %s (splitted)\n", rarlist->item.Name);
 	    rarlist = rarlist->next;
 	    continue;
 	}
 

 	if(limits) {

 
 	    if(limits->maxratio && rarlist->item.UnpSize && rarlist->item.PackSize) {
 		if((unsigned int) rarlist->item.UnpSize / (unsigned int) rarlist->item.PackSize >= limits->maxratio) {
 		    cli_dbgmsg("RAR: Max ratio reached (normal: %d, compressed: %d, max: %ld)\n", (int) rarlist->item.UnpSize, (int) rarlist->item.PackSize, limits->maxratio);
 		    *virname = "Oversized.RAR";
 		    ret = CL_VIRUS;
 		    break;
 		}
 	    }
 

 	    if(limits->maxfilesize && (rarlist->item.UnpSize > (unsigned int) limits->maxfilesize)) {

 		cli_dbgmsg("RAR: %s: Size exceeded (%u, max: %lu)\n", rarlist->item.Name, (unsigned int) rarlist->item.UnpSize, limits->maxfilesize);

 		rarlist = rarlist->next;

 		if(BLOCKMAX) {
 		    *virname = "RAR.ExceededFileSize";
 		    ret = CL_VIRUS;
 		    break;
 		}

 		continue;
 	    }
 
 	    if(limits->maxfiles && (files > limits->maxfiles)) {
 		cli_dbgmsg("RAR: Files limit reached (max: %d)\n", limits->maxfiles);

 		if(BLOCKMAX) {
 		    *virname = "RAR.ExceededFilesLimit";
 		    ret = CL_VIRUS;
 		    break;
 		}

 		break;
 	    }
 	}
 

         if(rarlist->item.FileAttr & RAR_FENTRY_ATTR_DIRECTORY) {

             rarlist = rarlist->next;
             continue;
         }
 

 	if((tmp = tmpfile()) == NULL) {

 	    cli_dbgmsg("RAR: Can't generate temporary file.\n");

 #ifdef CL_THREAD_SAFE
 	    pthread_mutex_unlock(&cli_scanrar_mutex);
 	    cli_scanrar_inuse = 0;
 #endif
 	    return CL_ETMPFILE;
 	}
 	fd = fileno(tmp);
 

 	if( urarlib_get(&rar_data_ptr, &rar_data_size, rarlist->item.Name, desc, "clam")) {

 	    cli_dbgmsg("RAR: Extracted: %s, size: %lu\n", rarlist->item.Name, rar_data_size);

 	    if(fwrite(rar_data_ptr, 1, rar_data_size, tmp) != rar_data_size) {

 		cli_dbgmsg("RAR: Can't write to file.\n");

 		fclose(tmp);

 		tmp = NULL;
 		ret = CL_ERAR;

 		if(rar_data_ptr) {

 		    free(rar_data_ptr);

 		    rar_data_ptr = NULL;
 		}

 		break;

 	    }
 

 	    if(rar_data_ptr) {

 		free(rar_data_ptr);

 		rar_data_ptr = NULL;
 	    }
 	    if(fflush(tmp) != 0) {

 		cli_dbgmsg("RAR: fflush() failed: %s\n", strerror(errno));

 		fclose(tmp);

 		urarlib_freelist(rarlist_head);

 #ifdef CL_THREAD_SAFE
 		pthread_mutex_unlock(&cli_scanrar_mutex);
 		cli_scanrar_inuse = 0;
 #endif
 		return CL_EFSYNC;
 	    }
 
 	    lseek(fd, 0, SEEK_SET);

 	    if((ret = cli_magic_scandesc(fd, virname, scanned, root, limits, options, arec, mrec)) == CL_VIRUS ) {

 		cli_dbgmsg("RAR: Infected with %s\n", *virname);

 		fclose(tmp);

 		urarlib_freelist(rarlist);
 #ifdef CL_THREAD_SAFE
 		pthread_mutex_unlock(&cli_scanrar_mutex);
 		cli_scanrar_inuse = 0;
 #endif

   		return ret;

 	    }
 
 	} else {

 	    cli_dbgmsg("RAR: Can't decompress file %s\n", rarlist->item.Name);

 	    fclose(tmp);

 	    tmp = NULL;

 	    ret = CL_ERAR; /* WinRAR 3.0 ? */
 	    break;

 	}
 

 	fclose(tmp);

 	tmp = NULL;
 	rarlist = rarlist->next;
     }
 

     urarlib_freelist(rarlist_head);

 #ifdef CL_THREAD_SAFE
     pthread_mutex_unlock(&cli_scanrar_mutex);
     cli_scanrar_inuse = 0;
     pthread_cleanup_pop(0);
 #endif

     cli_dbgmsg("RAR: Exit code: %d\n", ret);

     return ret;
 }
 
 #ifdef HAVE_ZLIB_H

 static int cli_scanzip(int desc, const char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, unsigned int options, unsigned int arec, unsigned int mrec)

 {
 	ZZIP_DIR *zdir;
 	ZZIP_DIRENT zdirent;
 	ZZIP_FILE *zfp;

 	FILE *tmp = NULL;

 	char *buff;

 	int fd, bytes, ret = CL_CLEAN;

 	unsigned long int size = 0;

 	unsigned int files = 0, encrypted;

 	struct stat source;

 	struct cli_meta_node *mdata;

 	zzip_error_t err;

 
     cli_dbgmsg("in scanzip()\n");

     if((zdir = zzip_dir_fdopen(dup(desc), &err)) == NULL) {

 	cli_dbgmsg("Zip: Not supported file format ?.\n");
 	cli_dbgmsg("Zip: zzip_dir_fdopen() return code: %d\n", err);

 	/* no return with CL_EZIP due to password protected zips */
 	return CL_CLEAN;

     }
 

     fstat(desc, &source);
 

     if(!(buff = (char *) cli_malloc(FILEBUFF))) {

 	cli_dbgmsg("Zip: unable to malloc(%d)\n", FILEBUFF);

 	zzip_dir_close(zdir);
 	return CL_EMEM;
     }
 

     while(zzip_dir_read(zdir, &zdirent)) {

 	files++;

 
 	if(!zdirent.d_name || !strlen(zdirent.d_name)) { /* Mimail fix */

 	    cli_dbgmsg("Zip: strlen(zdirent.d_name) == %d\n", strlen(zdirent.d_name));

 	    *virname = "Suspect.Zip";

 	    ret = CL_VIRUS;
 	    break;
 	}
 

         /* Bit 0: file is encrypted
 	 * Bit 6: Strong encryption was used
 	 * Bit 13: Encrypted central directory
 	 */
 	encrypted = (zdirent.d_flags & 0x2041 != 0);

 	cli_dbgmsg("Zip: %s, crc32: 0x%x, encrypted: %d, compressed: %u, normal: %u, method: %d, ratio: %d (max: %d)\n", zdirent.d_name, zdirent.d_crc32, encrypted, zdirent.d_csize, zdirent.st_size, zdirent.d_compr, zdirent.d_csize ? (zdirent.st_size / zdirent.d_csize) : 0, limits ? limits->maxratio : 0);

 	if(!zdirent.st_size) {

 	    if(zdirent.d_crc32) {
 		cli_dbgmsg("Zip: Broken file or modified information in local header part of archive\n");

 		*virname = "Exploit.Zip.ModifiedHeaders";

 		ret = CL_VIRUS;
 		break;
 	    }

 	    continue;
 	}
 

 	/* Scan metadata */
 	mdata = root->zip_mlist;

 	if(mdata) do {

 	    if(mdata->encrypted != encrypted)
 		continue;
 

 	    if(mdata->crc32 && mdata->crc32 != (unsigned int) zdirent.d_crc32)

 		continue;
 
 	    if(mdata->csize > 0 && mdata->csize != zdirent.d_csize)
 		continue;
 
 	    if(mdata->size >= 0 && mdata->size != zdirent.st_size)
 		continue;
 

 	    if(mdata->method >= 0 && mdata->method != (unsigned int) zdirent.d_compr)

 		continue;
 

 	    if(mdata->fileno && mdata->fileno != files)
 		continue;
 

 	    if(mdata->maxdepth && arec > mdata->maxdepth)

 		continue;
 
 	    /* TODO add support for regex */

 	    /*if(mdata->filename && !strstr(zdirent.d_name, mdata->filename))*/
 	    if(mdata->filename && strcmp(zdirent.d_name, mdata->filename))
 		continue;
 
 	    break; /* matched */
 
 	} while((mdata = mdata->next));
 
 	if(mdata) {
 	    *virname = mdata->virname;
 	    ret = CL_VIRUS;
 	    break;
 	}
 

 	/* 
 	 * Workaround for archives created with ICEOWS.
 	 * ZZIP_DIRENT does not contain information on file type
 	 * so we try to determine a directory via a filename
 	 */
 	if(zdirent.d_name[strlen(zdirent.d_name) - 1] == '/') {
 	    cli_dbgmsg("Zip: Directory entry with st_size != 0\n");
 	    continue;
 	}
 

 	/* work-around for problematic zips (zziplib crashes with them) */

 	if(zdirent.d_csize <= 0 || zdirent.st_size < 0) {

 	    cli_dbgmsg("Zip: Malformed archive detected.\n");

 	    *virname = "Suspect.Zip";

 	    ret = CL_VIRUS;

 	    break;
 	}
 

 	if(limits && limits->maxratio > 0 && ((unsigned) zdirent.st_size / (unsigned) zdirent.d_csize) >= limits->maxratio) {
 	    *virname = "Oversized.Zip";
 	    ret = CL_VIRUS;
 	    break;
         }
 

 	if(DETECT_ENCRYPTED && encrypted) {

 	    cli_dbgmsg("Zip: Encrypted files found in archive.\n");

 	    lseek(desc, 0, SEEK_SET);

 	    ret = cli_scandesc(desc, virname, scanned, root, 0, 0);
 	    if(ret < 0) {
 		break;
 	    } else if(ret != CL_VIRUS) {

 		*virname = "Encrypted.Zip";

 		ret = CL_VIRUS;
 	    }

 	    break;
 	}
 

 	if(limits) {

 	    if(limits->maxfilesize && ((unsigned int) zdirent.st_size > limits->maxfilesize)) {

 		cli_dbgmsg("Zip: %s: Size exceeded (%d, max: %ld)\n", zdirent.d_name, zdirent.st_size, limits->maxfilesize);

 		/* ret = CL_EMAXSIZE; */

 		if(BLOCKMAX) {
 		    *virname = "Zip.ExceededFileSize";
 		    ret = CL_VIRUS;
 		    break;
 		}
 		continue; /* continue scanning */

 	    }
 
 	    if(limits->maxfiles && (files > limits->maxfiles)) {
 		cli_dbgmsg("Zip: Files limit reached (max: %d)\n", limits->maxfiles);

 		if(BLOCKMAX) {
 		    *virname = "Zip.ExceededFilesLimit";
 		    ret = CL_VIRUS;
 		    break;
 		}

 		break;
 	    }
 	}
 

 	if((zfp = zzip_file_open(zdir, zdirent.d_name, 0)) == NULL) {
 	    cli_dbgmsg("Zip: Can't open file %s\n", zdirent.d_name);
 	    ret = CL_EZIP;
 	    break;
 	}
 

 	/* generate temporary file and get its descriptor */
 	if((tmp = tmpfile()) == NULL) {

 	    cli_dbgmsg("Zip: Can't generate tmpfile().\n");

 	    zzip_file_close(zfp);

 	    ret = CL_ETMPFILE;
 	    break;

 	}
 

 	size = 0;

 	while((bytes = zzip_file_read(zfp, buff, FILEBUFF)) > 0) {

 	    size += bytes;

 	    if(fwrite(buff, 1, bytes, tmp) != (size_t) bytes) {

 		cli_dbgmsg("Zip: Can't write to file.\n");

 		zzip_file_close(zfp);

 		zzip_dir_close(zdir);
 		fclose(tmp);

 		free(buff);

 		return CL_EIO;

 	    }
 	}
 
 	zzip_file_close(zfp);
 

 	if(!encrypted && size != zdirent.st_size) {

 	    cli_dbgmsg("Zip: Incorrectly decompressed (%d != %d)\n", size, zdirent.st_size);

 	    ret = CL_EZIP;

 	    break;
 	}
 

 	if(fflush(tmp) != 0) {

 	    cli_dbgmsg("Zip: fflush() failed: %s\n", strerror(errno));

 	    ret = CL_EFSYNC;
 	    break;

 	}
 

 	fd = fileno(tmp);
 

 	lseek(fd, 0, SEEK_SET);

 	if((ret = cli_magic_scandesc(fd, virname, scanned, root, limits, options, arec, mrec)) == CL_VIRUS ) {

 	    cli_dbgmsg("Zip: Infected with %s\n", *virname);

 	    ret = CL_VIRUS;
 	    break;
 	} else if(ret == CL_EMALFZIP) {

 	    cli_dbgmsg("Zip: Malformed Zip file, scanning stopped.\n");

 	    *virname = "Suspect.Zip";

 	    ret = CL_VIRUS;
 	    break;
 	}
 

 	if (tmp) {
 	    fclose(tmp);
 	    tmp = NULL;
 	}

     }
 
     zzip_dir_close(zdir);

     if (tmp) {
 	fclose(tmp);
 	tmp = NULL;
     }

 
     free(buff);

     return ret;
 }
 

 static int cli_scangzip(int desc, const char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, unsigned int options, unsigned int arec, unsigned int mrec)

 {
 	int fd, bytes, ret = CL_CLEAN;

 	unsigned long int size = 0;

 	char *buff;

 	FILE *tmp = NULL;

 	gzFile gd;
 
 

     cli_dbgmsg("in cli_scangzip()\n");
 

     if((gd = gzdopen(dup(desc), "rb")) == NULL) {

 	cli_dbgmsg("GZip: Can't open descriptor %d\n", desc);

 	return CL_EGZIP;
     }
 
     if((tmp = tmpfile()) == NULL) {

 	cli_dbgmsg("GZip: Can't generate temporary file.\n");

 	gzclose(gd);
 	return CL_ETMPFILE;
     }
     fd = fileno(tmp);
 

     if(!(buff = (char *) cli_malloc(FILEBUFF))) {

 	cli_dbgmsg("GZip: Unable to malloc %d bytes.\n", FILEBUFF);

 	gzclose(gd);

 	return CL_EMEM;

     }

     while((bytes = gzread(gd, buff, FILEBUFF)) > 0) {

 	size += bytes;
 
 	if(limits)

 	    if(limits->maxfilesize && (size + FILEBUFF > limits->maxfilesize)) {

 		cli_dbgmsg("GZip: Size exceeded (stopped at %ld, max: %ld)\n", size, limits->maxfilesize);

 		if(BLOCKMAX) {
 		    *virname = "GZip.ExceededFileSize";
 		    ret = CL_VIRUS;
 		}

 		break;
 	    }
 

 	if(cli_writen(fd, buff, bytes) != bytes) {

 	    cli_dbgmsg("GZip: Can't write to file.\n");

 	    fclose(tmp);

 	    gzclose(gd);

 	    free(buff);

 	    return CL_EGZIP;
 	}
     }
 

     free(buff);

     gzclose(gd);

 
     if(ret == CL_VIRUS) {
 	fclose(tmp);
 	return ret;
     }
 

     if(fsync(fd) == -1) {

 	cli_dbgmsg("GZip: Can't synchronise descriptor %d\n", fd);

 	fclose(tmp);

 	return CL_EFSYNC;
     }
 
     lseek(fd, 0, SEEK_SET);

     if((ret = cli_magic_scandesc(fd, virname, scanned, root, limits, options, arec, mrec)) == CL_VIRUS ) {

 	cli_dbgmsg("GZip: Infected with %s\n", *virname);

 	fclose(tmp);

 	return CL_VIRUS;
     }

     fclose(tmp);

 
     return ret;
 }
 #endif
 
 #ifdef HAVE_BZLIB_H
 
 #ifdef NOBZ2PREFIX
 #define BZ2_bzReadOpen bzReadOpen
 #define BZ2_bzReadClose bzReadClose
 #define BZ2_bzRead bzRead
 #endif
 

 static int cli_scanbzip(int desc, const char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, unsigned int options, unsigned int arec, unsigned int mrec)

 {
 	int fd, bytes, ret = CL_CLEAN, bzerror = 0;
 	short memlim = 0;

 	unsigned long int size = 0;

 	char *buff;

 	FILE *fs, *tmp = NULL;

 	BZFILE *bfd;
 
 

     if((fs = fdopen(dup(desc), "rb")) == NULL) {

 	cli_dbgmsg("Bzip: Can't open descriptor %d.\n", desc);

 	return CL_EBZIP;
     }
 
     if(limits)
 	if(limits->archivememlim)
 	    memlim = 1;
 

     if((bfd = BZ2_bzReadOpen(&bzerror, fs, 0, memlim, NULL, 0)) == NULL) {

 	cli_dbgmsg("Bzip: Can't initialize bzip2 library (descriptor: %d).\n", desc);

 	fclose(fs);

 	return CL_EBZIP;
     }
 
     if((tmp = tmpfile()) == NULL) {

 	cli_dbgmsg("Bzip: Can't generate temporary file.\n");

 	BZ2_bzReadClose(&bzerror, bfd);

 	fclose(fs);

 	return CL_ETMPFILE;
     }
     fd = fileno(tmp);
 

     if(!(buff = (char *) malloc(FILEBUFF))) {

 	cli_dbgmsg("Bzip: Unable to malloc %d bytes.\n", FILEBUFF);

 	fclose(tmp);
 	fclose(fs);
 	BZ2_bzReadClose(&bzerror, bfd);

 	return CL_EMEM;

     }

     while((bytes = BZ2_bzRead(&bzerror, bfd, buff, FILEBUFF)) > 0) {

 	size += bytes;
 
 	if(limits)

 	    if(limits->maxfilesize && (size + FILEBUFF > limits->maxfilesize)) {

 		cli_dbgmsg("Bzip: Size exceeded (stopped at %ld, max: %ld)\n", size, limits->maxfilesize);

 		if(BLOCKMAX) {
 		    *virname = "BZip.ExceededFileSize";
 		    ret = CL_VIRUS;
 		}

 		break;
 	    }
 

 	if(cli_writen(fd, buff, bytes) != bytes) {

 	    cli_dbgmsg("Bzip: Can't write to file.\n");

 	    BZ2_bzReadClose(&bzerror, bfd);

 	    fclose(tmp);

 	    free(buff);

 	    fclose(fs);

 	    return CL_EGZIP;
 	}
     }
 

     free(buff);

     BZ2_bzReadClose(&bzerror, bfd);

 
     if(ret == CL_VIRUS) {
 	fclose(tmp);
 	fclose(fs);
 	return ret;
     }
 

     if(fsync(fd) == -1) {

 	cli_dbgmsg("Bzip: Synchronisation failed for descriptor %d\n", fd);

 	fclose(tmp);

 	fclose(fs);

 	return CL_EFSYNC;
     }
 
     lseek(fd, 0, SEEK_SET);

     if((ret = cli_magic_scandesc(fd, virname, scanned, root, limits, options, arec, mrec)) == CL_VIRUS ) {

 	cli_dbgmsg("Bzip: Infected with %s\n", *virname);

     }

     fclose(tmp);

     fclose(fs);

 
     return ret;
 }
 #endif
 

 static int cli_scanszdd(int desc, const char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, unsigned int options, unsigned int arec, unsigned int mrec)

 {
 	int fd, ret = CL_CLEAN;
 	FILE *tmp = NULL, *in;
 

     cli_dbgmsg("in cli_scanmscomp()\n");
 
     if((in = fdopen(dup(desc), "rb")) == NULL) {

 	cli_dbgmsg("SZDD: Can't open descriptor %d\n", desc);

 	return CL_EMSCOMP;
     }
 
     if((tmp = tmpfile()) == NULL) {

 	cli_dbgmsg("SZDD: Can't generate temporary file.\n");

 	fclose(in);
 	return CL_ETMPFILE;
     }
 
     if(cli_msexpand(in, tmp) == -1) {

 	cli_dbgmsg("SZDD: msexpand failed.\n");

 	return CL_EMSCOMP;
     }
 
     fclose(in);
     if(fflush(tmp)) {

 	cli_dbgmsg("SZDD: fflush() failed.\n");

 	fclose(tmp);
 	return CL_EFSYNC;
     }
 
     fd = fileno(tmp);
     lseek(fd, 0, SEEK_SET);

     if((ret = cli_magic_scandesc(fd, virname, scanned, root, limits, options, arec, mrec)) == CL_VIRUS) {

 	cli_dbgmsg("SZDD: Infected with %s\n", *virname);

 	fclose(tmp);
 	return CL_VIRUS;
     }
 
     fclose(tmp);
     return ret;
 }
 

 static int cli_scanmscab(int desc, const char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, unsigned int options, unsigned int arec, unsigned int mrec)

 {
 	struct mscab_decompressor *cabd = NULL;
 	struct mscabd_cabinet *base, *cab;
 	struct mscabd_file *file;
 	char *tempname;
 	int ret = CL_CLEAN;
 
 
     cli_dbgmsg("in cli_scanmscab()\n");
 
     if((cabd = mspack_create_cab_decompressor(NULL)) == NULL) {

 	cli_dbgmsg("MSCAB: Can't create libmspack CAB decompressor\n");

 	return CL_EMSCAB;
     }
 

     if((base = cabd->dsearch(cabd, dup(desc))) == NULL) {

 	cli_dbgmsg("MSCAB: I/O error or no valid cabinets found\n");

 	mspack_destroy_cab_decompressor(cabd);
 	return CL_EMSCAB;
     }
 
     for(cab = base; cab; cab = cab->next) {
 	for(file = cab->files; file; file = file->next) {

 
 	    if(limits && limits->maxfilesize && (file->length > (unsigned int) limits->maxfilesize)) {
 		cli_dbgmsg("MSCAB: %s: Size exceeded (%u, max: %lu)\n", file->filename, file->length, limits->maxfilesize);
 		if(BLOCKMAX) {
 		    *virname = "MSCAB.ExceededFileSize";
 		    cabd->close(cabd, base);
 		    mspack_destroy_cab_decompressor(cabd);
 		    return CL_VIRUS;
 		}
 		continue;
 	    }
 

 	    tempname = cli_gentemp(NULL);

 	    cli_dbgmsg("MSCAB: Extracting data to %s\n", tempname);

 	    if(cabd->extract(cabd, file, tempname)) {

 		cli_dbgmsg("MSCAB: libmscab error code: %d\n", cabd->last_error(cabd));

 	    } else {

 		ret = cli_scanfile(tempname, virname, scanned, root, limits, options, arec, mrec);

 	    }
 	    if(!cli_leavetemps_flag)
 		unlink(tempname);
 	    free(tempname);
 	    if(ret == CL_VIRUS)
 		break;
 	}
 	if(ret == CL_VIRUS)
 	    break;
     }
 
     cabd->close(cabd, base);
     mspack_destroy_cab_decompressor(cabd);
 
     return ret;
 }
 

 static int cli_scandir(const char *dirname, const char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, unsigned int options, unsigned int arec, unsigned int mrec)

 {

 	DIR *dd;
 	struct dirent *dent;

 #if defined(HAVE_READDIR_R_3) || defined(HAVE_READDIR_R_2)

 	union {
 	    struct dirent d;
 	    char b[offsetof(struct dirent, d_name) + NAME_MAX + 1];
 	} result;

 #endif

 	struct stat statbuf;
 	char *fname;

     if((dd = opendir(dirname)) != NULL) {

 #ifdef HAVE_READDIR_R_3

 	while(!readdir_r(dd, &result.d, &dent) && dent) {

 #elif defined(HAVE_READDIR_R_2)

 	while((dent = (struct dirent *) readdir_r(dd, &result.d))) {

 #else

 	while((dent = readdir(dd))) {

 #endif

 #ifndef C_INTERIX
 	    if(dent->d_ino)
 #endif
 	    {

 		if(strcmp(dent->d_name, ".") && strcmp(dent->d_name, "..")) {
 		    /* build the full name */
 		    fname = cli_calloc(strlen(dirname) + strlen(dent->d_name) + 2, sizeof(char));
 		    sprintf(fname, "%s/%s", dirname, dent->d_name);

 		    /* stat the file */
 		    if(lstat(fname, &statbuf) != -1) {
 			if(S_ISDIR(statbuf.st_mode) && !S_ISLNK(statbuf.st_mode)) {

 			    if (cli_scandir(fname, virname, scanned, root, limits, options, arec, mrec) == CL_VIRUS) {

 				free(fname);
 				closedir(dd);
 				return CL_VIRUS;
 			    }
 			} else
 			    if(S_ISREG(statbuf.st_mode))

 				if(cli_scanfile(fname, virname, scanned, root, limits, options, arec, mrec) == CL_VIRUS) {

 				    free(fname);
 				    closedir(dd);
 				    return CL_VIRUS;
 				}

 		    }

 		    free(fname);

 		}
 	    }
 	}

     } else {

 	cli_dbgmsg("ScanDir: Can't open directory %s.\n", dirname);

 	return CL_EOPEN;
     }

     closedir(dd);
     return 0;

 }

 static int cli_vba_scandir(const char *dirname, const char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, unsigned int options, unsigned int arec, unsigned int mrec)

 {

 	int ret = CL_CLEAN, i, fd, data_len;
 	vba_project_t *vba_project;

 	DIR *dd;
 	struct dirent *dent;

 #if defined(HAVE_READDIR_R_3) || defined(HAVE_READDIR_R_2)

 	union {
 	    struct dirent d;
 	    char b[offsetof(struct dirent, d_name) + NAME_MAX + 1];
 	} result;

 #endif

 	struct stat statbuf;

 	char *fname, *fullname;

 	unsigned char *data;
 

 
     cli_dbgmsg("VBADir: %s\n", dirname);

     if((vba_project = (vba_project_t *) vba56_dir_read(dirname))) {

 	for(i = 0; i < vba_project->count; i++) {
 	    fullname = (char *) cli_malloc(strlen(vba_project->dir) + strlen(vba_project->name[i]) + 2);
 	    sprintf(fullname, "%s/%s", vba_project->dir, vba_project->name[i]);
 	    fd = open(fullname, O_RDONLY);
 	    if(fd == -1) {

 		cli_dbgmsg("VBADir: Can't open file %s\n", fullname);

 		free(fullname);
 		ret = CL_EOPEN;
 		break;
 	    }
 	    free(fullname);

             cli_dbgmsg("VBADir: Decompress VBA project '%s'\n", vba_project->name[i]);

 	    data = (unsigned char *) vba_decompress(fd, vba_project->offset[i], &data_len);
 	    close(fd);
 
 	    if(!data) {

 		cli_dbgmsg("VBADir: WARNING: VBA project '%s' decompressed to NULL\n", vba_project->name[i]);

 	    } else {

 		if(scanned)
 		    *scanned += data_len / CL_COUNT_PRECISION;
 

 		if(cli_scanbuff(data, data_len, virname, root, CL_TYPE_MSOLE2) == CL_VIRUS) {

 		    free(data);
 		    ret = CL_VIRUS;
 		    break;
 		}
 
 		free(data);
 	    }
 	}
 
 	for(i = 0; i < vba_project->count; i++)
 	    free(vba_project->name[i]);
 	free(vba_project->name);
 	free(vba_project->dir);
 	free(vba_project->offset);
 	free(vba_project);

     } else if ((fullname = ppt_vba_read(dirname))) {

     	if(cli_scandir(fullname, virname, scanned, root, limits, options, arec, mrec) == CL_VIRUS) {

 	    ret = CL_VIRUS;
 	}

 	if(!cli_leavetemps_flag)
 	    cli_rmdirs(fullname);

     	free(fullname);

     } else if ((vba_project = (vba_project_t *) wm_dir_read(dirname))) {
     	for (i = 0; i < vba_project->count; i++) {
 		fullname = (char *) cli_malloc(strlen(vba_project->dir) + strlen(vba_project->name[i]) + 2);
 		sprintf(fullname, "%s/%s", vba_project->dir, vba_project->name[i]);
 		fd = open(fullname, O_RDONLY);
 		if(fd == -1) {

 			cli_dbgmsg("VBADir: Can't open file %s\n", fullname);

 			free(fullname);
 			ret = CL_EOPEN;
 			break;
 		}
 		free(fullname);

 		cli_dbgmsg("VBADir: Decompress WM project '%s' macro:%d key:%d\n", vba_project->name[i], i, vba_project->key[i]);

 		data = (unsigned char *) wm_decrypt_macro(fd, vba_project->offset[i], vba_project->length[i], vba_project->key[i]);
 		close(fd);
 		
 		if(!data) {

 			cli_dbgmsg("VBADir: WARNING: WM project '%s' macro %d decrypted to NULL\n", vba_project->name[i], i);

 		} else {

 			if(scanned)
 			    *scanned += vba_project->length[i] / CL_COUNT_PRECISION;

 			if(cli_scanbuff(data, vba_project->length[i], virname, root, CL_TYPE_MSOLE2) == CL_VIRUS) {

 				free(data);
 				ret = CL_VIRUS;
 				break;
 			}
 			free(data);
 		}
 	}
 	for(i = 0; i < vba_project->count; i++)
 	    free(vba_project->name[i]);
 	free(vba_project->key);
 	free(vba_project->length);
 	free(vba_project->offset);
 	free(vba_project->name);
 	free(vba_project->dir);
 	free(vba_project);

     }

     if(ret != CL_CLEAN)
     	return ret;

 
     if((dd = opendir(dirname)) != NULL) {

 #ifdef HAVE_READDIR_R_3

 	while(!readdir_r(dd, &result.d, &dent) && dent) {

 #elif defined(HAVE_READDIR_R_2)

 	while((dent = (struct dirent *) readdir_r(dd, &result.d))) {

 #else

 	while((dent = readdir(dd))) {

 #endif

 #ifndef C_INTERIX
 	    if(dent->d_ino)
 #endif
 	    {

 		if(strcmp(dent->d_name, ".") && strcmp(dent->d_name, "..")) {
 		    /* build the full name */
 		    fname = cli_calloc(strlen(dirname) + strlen(dent->d_name) + 2, sizeof(char));
 		    sprintf(fname, "%s/%s", dirname, dent->d_name);
 
 		    /* stat the file */
 		    if(lstat(fname, &statbuf) != -1) {
 			if(S_ISDIR(statbuf.st_mode) && !S_ISLNK(statbuf.st_mode))

 			    if (cli_vba_scandir(fname, virname, scanned, root, limits, options, arec, mrec) == CL_VIRUS) {

 			    	ret = CL_VIRUS;
 				free(fname);
 				break;
 			    }

 		    }
 		    free(fname);
 		}
 	    }
 	}
     } else {

 	cli_dbgmsg("VBADir: Can't open directory %s.\n", dirname);

 	return CL_EOPEN;
     }
 
     closedir(dd);

     return ret;
 }
 

 static int cli_scanhtml(int desc, const char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, unsigned int options, unsigned int arec, unsigned int mrec)

 {
 	char *tempname, fullname[1024];
 	int ret=CL_CLEAN, fd;
 
 
     cli_dbgmsg("in cli_scanhtml()\n");
 
     tempname = cli_gentemp(NULL);
     if(mkdir(tempname, 0700)) {
         cli_dbgmsg("ScanHTML -> Can't create temporary directory %s\n", tempname);

 	free(tempname);

         return CL_ETMPDIR;
     }
 
     html_normalise_fd(desc, tempname, NULL);
     snprintf(fullname, 1024, "%s/comment.html", tempname);
     fd = open(fullname, O_RDONLY);
     if (fd >= 0) {
         ret = cli_scandesc(fd, virname, scanned, root, 0, CL_TYPE_HTML);
 	close(fd);
     }
 
     if(ret < 0 || ret == CL_VIRUS) {
 	if(!cli_leavetemps_flag)
 	    cli_rmdirs(tempname);
 	free(tempname);
 	return ret;
     }
 
     if (ret == CL_CLEAN) {
 	snprintf(fullname, 1024, "%s/nocomment.html", tempname);
 	fd = open(fullname, O_RDONLY);
 	if (fd >= 0) {
 	    ret = cli_scandesc(fd, virname, scanned, root, 0, CL_TYPE_HTML);
 	    close(fd);
 	}
     }
 
     if(ret < 0 || ret == CL_VIRUS) {
 	if(!cli_leavetemps_flag)
 	    cli_rmdirs(tempname);
 	free(tempname);
 	return ret;
     }
 
     if (ret == CL_CLEAN) {
 	snprintf(fullname, 1024, "%s/script.html", tempname);
 	fd = open(fullname, O_RDONLY);
 	if (fd >= 0) {
 	    ret = cli_scandesc(fd, virname, scanned, root, 0, CL_TYPE_HTML);
 	    close(fd);
 	}
     }
 
     if(ret < 0 || ret == CL_VIRUS) {
 	if(!cli_leavetemps_flag)
 	    cli_rmdirs(tempname);
 	free(tempname);
 	return ret;
     }
 
     if (ret == CL_CLEAN) {
     	snprintf(fullname, 1024, "%s/rfc2397", tempname);
     	ret = cli_scandir(fullname, virname, scanned, root, limits, options, arec, mrec);
     }
 
     if(!cli_leavetemps_flag)
         cli_rmdirs(tempname);
 
     free(tempname);
     return ret;
 }
 

 static int cli_scanole2(int desc, const char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, unsigned int options, unsigned int arec, unsigned int mrec)

 {

 	char *dir;
 	int ret = CL_CLEAN;

     cli_dbgmsg("in cli_scanole2()\n");
 
     /* generate the temporary directory */

     dir = cli_gentemp(NULL);

     if(mkdir(dir, 0700)) {

 	cli_dbgmsg("OLE2: Can't create temporary directory %s\n", dir);

 	free(dir);

 	return CL_ETMPDIR;
     }
 

     if((ret = cli_ole2_extract(desc, dir, limits))) {

 	cli_dbgmsg("OLE2: %s\n", cl_strerror(ret));

 	if(!cli_leavetemps_flag)
 	    cli_rmdirs(dir);

 	free(dir);
 	return ret;
     }
 

     if((ret = cli_vba_scandir(dir, virname, scanned, root, limits, options, arec, mrec)) != CL_VIRUS) {
 	if(cli_scandir(dir, virname, scanned, root, limits, options, arec, mrec) == CL_VIRUS) {

 	    ret = CL_VIRUS;

 	}
     }
 

     if(!cli_leavetemps_flag)
 	cli_rmdirs(dir);

     free(dir);
     return ret;

 }
 

 static int cli_scantar(int desc, const char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, unsigned int options, unsigned int arec, unsigned int mrec, unsigned int posix)

 {
 	char *dir;
 	int ret = CL_CLEAN;
 
 
     cli_dbgmsg("in cli_scantar()\n");
 
     /* generate temporary directory */

     dir = cli_gentemp(NULL);

     if(mkdir(dir, 0700)) {
 	cli_errmsg("Tar: Can't create temporary directory %s\n", dir);

 	free(dir);

 	return CL_ETMPDIR;
     }
 

     if((ret = cli_untar(dir, desc, posix)))

 	cli_dbgmsg("Tar: %s\n", cl_strerror(ret));
     else
 	ret = cli_scandir(dir, virname, scanned, root, limits, options, arec, mrec);
 
     if(!cli_leavetemps_flag)
 	cli_rmdirs(dir);
 
     free(dir);
     return ret;
 }
 

 static int cli_scanbinhex(int desc, const char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, unsigned int options, unsigned int arec, unsigned int mrec)

 {
 	char *dir;
 	int ret = CL_CLEAN;
 
 
     cli_dbgmsg("in cli_scanbinhex()\n");
 
     /* generate temporary directory */
     dir = cli_gentemp(NULL);
 
     if(mkdir(dir, 0700)) {
 	cli_errmsg("Binhex: Can't create temporary directory %s\n", dir);

 	free(dir);

 	return CL_ETMPDIR;
     }
 
     if((ret = cli_binhex(dir, desc)))
 	cli_dbgmsg("Binhex: %s\n", cl_strerror(ret));
     else
 	ret = cli_scandir(dir, virname, scanned, root, limits, options, arec, mrec);
 
     if(!cli_leavetemps_flag)
 	cli_rmdirs(dir);
 
     free(dir);
     return ret;
 }
 

 static int cli_scanmschm(int desc, const char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, unsigned int options, unsigned int arec, unsigned int mrec)

 {
 	char *tempname;
 	int ret = CL_CLEAN;
 
 
     cli_dbgmsg("in cli_scanmschm()\n");	
 

     tempname = cli_gentemp(NULL);

     if(mkdir(tempname, 0700)) {

 	cli_dbgmsg("CHM: Can't create temporary directory %s\n", tempname);

 	free(tempname);

 	return CL_ETMPDIR;
     }
 
     if(chm_unpack(desc, tempname))
 	ret = cli_scandir(tempname, virname, scanned, root, limits, options, arec, mrec);
 
     if(!cli_leavetemps_flag)
 	cli_rmdirs(tempname);
 
     free(tempname);
     return ret;
 }
 

 static int cli_scanscrenc(int desc, const char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, unsigned int options, unsigned int arec, unsigned int mrec)

 {
 	char *tempname;
 	int ret = CL_CLEAN;
 
     cli_dbgmsg("in cli_scanscrenc()\n");
 

     tempname = cli_gentemp(NULL);

     if(mkdir(tempname, 0700)) {
 	cli_dbgmsg("CHM: Can't create temporary directory %s\n", tempname);

 	free(tempname);

 	return CL_ETMPDIR;
     }
 
     if (html_screnc_decode(desc, tempname))
 	ret = cli_scandir(tempname, virname, scanned, root, limits, options, arec, mrec);
 
     if(!cli_leavetemps_flag)
 	cli_rmdirs(tempname);
 
     free(tempname);
     return ret;
 }

 static int cli_scanriff(int desc, const char **virname)

 {
 	int ret = CL_CLEAN;
 
     if(cli_check_riff_exploit(desc) == 2) {
 	ret = CL_VIRUS;
 	*virname = "Exploit.W32.MS05-002";
     }
 
     return ret;
 }
 

 static int cli_scanjpeg(int desc, const char **virname)
 {
 	int ret = CL_CLEAN;
 
     if(cli_check_jpeg_exploit(desc) == 1) {
 	ret = CL_VIRUS;
 	*virname = "Exploit.W32.MS04-028";
     }
 
     return ret;
 }
 

 static int cli_scantnef(int desc, const char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, unsigned int options, unsigned int arec, unsigned int mrec)
 {
 	int ret;
 	char *dir = cli_gentemp(NULL);
 
 
     if(mkdir(dir, 0700)) {
 	cli_dbgmsg("Can't create temporary directory for tnef file %s\n", dir);
 	free(dir);
 	return CL_ETMPDIR;
     }
 
     ret = cli_tnef(dir, desc);
 
     if(ret == CL_CLEAN)
 	ret = cli_scandir(dir, virname, scanned, root, limits, options, arec, mrec);
 
     if(!cli_leavetemps_flag)
 	cli_rmdirs(dir);
 
     free(dir);
     return ret;
 }
 

 static int cli_scanmail(int desc, const char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, unsigned int options, unsigned int arec, unsigned int mrec)

 {
 	char *dir;
 	int ret;
 
 

     cli_dbgmsg("Starting cli_scanmail(), mrec == %d, arec == %d\n", mrec, arec);

     /* generate the temporary directory */
     dir = cli_gentemp(NULL);
     if(mkdir(dir, 0700)) {
 	cli_dbgmsg("Mail: Can't create temporary directory %s\n", dir);
 	free(dir);
 	return CL_ETMPDIR;
     }

     /*
      * Extract the attachments into the temporary directory
      */
     if((ret = cli_mbox(dir, desc, options))) {

 	if(!cli_leavetemps_flag)
 	    cli_rmdirs(dir);

 	free(dir);
 	return ret;

     }
 
     ret = cli_scandir(dir, virname, scanned, root, limits, options, arec, mrec);
 
     if(!cli_leavetemps_flag)
 	cli_rmdirs(dir);
 
     free(dir);
     return ret;

 }
 

 int cli_magic_scandesc(int desc, const char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, unsigned int options, unsigned int arec, unsigned int mrec)

 {

 	int ret = CL_CLEAN, nret;

 	int bread = 0;

 	cli_file_t type;

 	struct stat sb;
 
 
     if(fstat(desc, &sb) == -1) {
 	cli_errmsg("Can's fstat descriptor %d\n", desc);
 	return CL_EIO;
     }

     if(sb.st_size <= 5) {
 	cli_dbgmsg("Small data (%d bytes)\n", sb.st_size);
 	return CL_CLEAN;
     }

 
     if(!root) {

 	cli_errmsg("CRITICAL: root == NULL\n");

 	return CL_EMALFDB;

     }
 

     if(!options) { /* raw mode (stdin, etc.) */

 	cli_dbgmsg("Raw mode: No support for special files\n");
 	if((ret = cli_scandesc(desc, virname, scanned, root, 0, 0) == CL_VIRUS))

 	    cli_dbgmsg("%s found in descriptor %d\n", *virname, desc);

 	return ret;
     }
 

     if(SCAN_ARCHIVE && limits && limits->maxreclevel)

 	if(arec > limits->maxreclevel) {
 	    cli_dbgmsg("Archive recursion limit exceeded (arec == %d).\n", arec);

 	    if(BLOCKMAX) {
 		*virname = "Archive.ExceededRecursionLimit";
 		return CL_VIRUS;
 	    }

 	    return CL_CLEAN;

 	}

     if(SCAN_MAIL)

 	if(mrec > MAX_MAIL_RECURSION) {
 	    cli_dbgmsg("Mail recursion level exceeded (mrec == %d).\n", mrec);

 	    /* return CL_EMAXREC; */
 	    return CL_CLEAN;
 	}

     lseek(desc, 0, SEEK_SET);

     type = cli_filetype2(desc);

     lseek(desc, 0, SEEK_SET);

     type == CL_TYPE_MAIL ? mrec++ : arec++;

     switch(type) {

 	case CL_TYPE_RAR:

 	    if(!DISABLE_RAR && SCAN_ARCHIVE && !cli_scanrar_inuse)

 		ret = cli_scanrar(desc, virname, scanned, root, limits, options, arec, mrec);

 	    break;

 	case CL_TYPE_ZIP:

 	    if(SCAN_ARCHIVE)

 		ret = cli_scanzip(desc, virname, scanned, root, limits, options, arec, mrec);

 	    break;

 	case CL_TYPE_GZ:

 	    if(SCAN_ARCHIVE)

 		ret = cli_scangzip(desc, virname, scanned, root, limits, options, arec, mrec);

 	    break;

 	case CL_TYPE_BZ:

 #ifdef HAVE_BZLIB_H

 	    if(SCAN_ARCHIVE)

 		ret = cli_scanbzip(desc, virname, scanned, root, limits, options, arec, mrec);

 #endif

 	    break;

 	case CL_TYPE_MSSZDD:

 	    if(SCAN_ARCHIVE)

 		ret = cli_scanszdd(desc, virname, scanned, root, limits, options, arec, mrec);

 	    break;
 

 	case CL_TYPE_MSCAB:

 	    if(SCAN_ARCHIVE)

 		ret = cli_scanmscab(desc, virname, scanned, root, limits, options, arec, mrec);

 	    break;
 

 	case CL_TYPE_MAIL:

 	    if(SCAN_MAIL)

 		ret = cli_scanmail(desc, virname, scanned, root, limits, options, arec, mrec);

 	    break;

 	case CL_TYPE_TNEF:
 	    if(SCAN_MAIL)
 		ret = cli_scantnef(desc, virname, scanned, root, limits, options, arec, mrec);
 	    break;
 

 	case CL_TYPE_MSCHM:

 	    if(SCAN_ARCHIVE)
 		ret = cli_scanmschm(desc, virname, scanned, root, limits, options, arec, mrec);
 	    break;
 

 	case CL_TYPE_MSOLE2:

 	    if(SCAN_OLE2)

 		ret = cli_scanole2(desc, virname, scanned, root, limits, options, arec, mrec);

 	    break;

 	case CL_TYPE_POSIX_TAR:
 	    if(SCAN_ARCHIVE)
 		ret = cli_scantar(desc, virname, scanned, root, limits, options, arec, mrec, 1);
 	    break;
 
 	case CL_TYPE_OLD_TAR:

 	    if(SCAN_ARCHIVE)

 		ret = cli_scantar(desc, virname, scanned, root, limits, options, arec, mrec, 0);

 	    break;
 
 	case CL_TYPE_BINHEX:
 	    if(SCAN_ARCHIVE)
 		ret = cli_scanbinhex(desc, virname, scanned, root, limits, options, arec, mrec);

 	    break;
 

 	case CL_TYPE_SCRENC:

 	    ret = cli_scanscrenc(desc, virname, scanned, root, limits, options, arec, mrec);

 	    break;
 
 	case CL_TYPE_RIFF:

 	    ret = cli_scanriff(desc, virname);

 	    break;
 

 	case CL_TYPE_GRAPHICS:
 	    ret = cli_scanjpeg(desc, virname);
 	    break;
 

 	case CL_TYPE_DATA:

 	    /* it could be a false positive and a standard DOS .COM file */
 	    {
 		struct stat s;
 		if(fstat(desc, &s) == 0 && S_ISREG(s.st_mode) && s.st_size < 65536)

 		type = CL_TYPE_UNKNOWN_DATA;

 	    }
 

 	case CL_TYPE_UNKNOWN_DATA:

 	    ret = cli_check_mydoom_log(desc, virname);

 	    break;

 
 	default:
 	    break;

     }
 

     type == CL_TYPE_MAIL ? mrec-- : arec--;

     if(type != CL_TYPE_DATA && ret != CL_VIRUS) { /* scan the raw file */

 	    int typerec;

 	type == CL_TYPE_UNKNOWN_TEXT ? (typerec = 1) : (typerec = 0);

 	if(lseek(desc, 0, SEEK_SET) < 0)
 	    cli_errmsg("lseek() failed, trying to continue anyway...\n");

 	if((nret = cli_scandesc(desc, virname, scanned, root, typerec, type)) == CL_VIRUS) {

 	    cli_dbgmsg("%s found in descriptor %d.\n", *virname, desc);

 	    return CL_VIRUS;

 	} else if(nret < 0) {
 	    return nret;
 

 	} else if(nret >= CL_TYPENO) {
 	    lseek(desc, 0, SEEK_SET);
 

 	    nret == CL_TYPE_MAIL ? mrec++ : arec++;

 	    switch(nret) {

 		case CL_TYPE_HTML:

 		    if(SCAN_HTML)

 			if(cli_scanhtml(desc, virname, scanned, root, limits, options, arec, mrec) == CL_VIRUS)

 			    return CL_VIRUS;
 		    break;

 		case CL_TYPE_MAIL:

 		    if(SCAN_MAIL)

 			if(cli_scanmail(desc, virname, scanned, root, limits, options, arec, mrec) == CL_VIRUS)

 			    return CL_VIRUS;
 		    break;

 	    }

 	    nret == CL_TYPE_MAIL ? mrec-- : arec--;

 	}

     }

     arec++;

     lseek(desc, 0, SEEK_SET);
     switch(type) {
 	/* Due to performance reasons all executables were first scanned
 	 * in raw mode. Now we will try to unpack them
 	 */

 	case CL_TYPE_MSEXE:

 	    if(SCAN_PE)
 		ret = cli_scanpe(desc, virname, scanned, root, limits, options, arec, mrec);
 	    break;

 
 	default:
 	    break;

     }

     arec--;

     if(ret == CL_EFORMAT) {

 	cli_dbgmsg("Descriptor[%d]: %s\n", desc, cl_strerror(CL_EFORMAT));

 	return CL_CLEAN;
     } else {
 	return ret;
     }

 }
 

 int cl_scandesc(int desc, const char **virname, unsigned long int *scanned, const struct cl_node *root, const struct cl_limits *limits, unsigned int options)

 {

     return cli_magic_scandesc(desc, virname, scanned, root, limits, options, 0, 0);

 }
 

 static int cli_scanfile(const char *filename, const char **virname, unsigned long int *scanned, const struct cl_node *root, const struct cl_limits *limits, unsigned int options, unsigned int arec, unsigned int mrec)

 {
 	int fd, ret;
 

     /* internal version of cl_scanfile with arec/mrec preserved */

     if((fd = open(filename, O_RDONLY)) == -1)
 	return CL_EOPEN;
 

     ret = cli_magic_scandesc(fd, virname, scanned, root, limits, options, arec, mrec);

 
     close(fd);
     return ret;
 }
 

 int cl_scanfile(const char *filename, const char **virname, unsigned long int *scanned, const struct cl_node *root, const struct cl_limits *limits, unsigned int options)

 {
 	int fd, ret;
 

     if((fd = open(filename, O_RDONLY)) == -1)
 	return CL_EOPEN;
 
     ret = cl_scandesc(fd, virname, scanned, root, limits, options);
     close(fd);
 
     return ret;
 }