/*

  *  Copyright (C) 1999 - 2004 Tomasz Kojm <tk@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 <stdarg.h>
 #include <string.h>
 #include <stdlib.h>
 #include <ctype.h>
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
 #include <sys/time.h>
 #include <dirent.h>
 #include <time.h>
 #include <fcntl.h>
 #include <pwd.h>
 #include <errno.h>
 #include <target.h>

 #include <sys/time.h>

 #ifdef CL_THREAD_SAFE
 #  include <pthread.h>

 pthread_mutex_t cli_gentemp_mutex = PTHREAD_MUTEX_INITIALIZER;

 #endif
 

 #include "clamav.h"
 #include "others.h"
 #include "md5.h"

 #include "cltypes.h"

 #define CL_FLEVEL 2 /* don't touch it */

 #define MAX_ALLOCATION 134217728

 short cli_debug_flag = 0, cli_leavetemps_flag = 0;

 static unsigned char oldmd5buff[16] = { 16, 38, 97, 12, 8, 4, 72, 196, 217, 144, 33, 124, 18, 11, 17, 253 };
 

 void cli_warnmsg(const char *str, ...)
 {
 	va_list args;
 
     va_start(args, str);
     fprintf(stderr, "LibClamAV Warning: ");
     vfprintf(stderr, str, args);
     va_end(args);
 }
 
 void cli_errmsg(const char *str, ...)
 {
 	va_list args;
 
     va_start(args, str);
     fprintf(stderr, "LibClamAV Error: ");
     vfprintf(stderr, str, args);
     va_end(args);
 }
 
 void cli_dbgmsg(const char *str, ...)
 {
 	va_list args;
 

     if(cli_debug_flag) {
 	va_start(args, str);
 	fprintf(stderr, "LibClamAV debug: ");
 	vfprintf(stderr, str, args);
 	va_end(args);
     } else
 	return;
 
 }
 
 void cl_debug(void)
 {
     cli_debug_flag = 1;

 }
 

 int cl_retflevel(void)
 {
     return CL_FLEVEL;
 }
 

 const char *cl_retver(void)
 {
     return VERSION;
 }
 

 const char *cl_strerror(int clerror)

 {
     switch(clerror) {
 	case CL_CLEAN:

 	    return "No viruses detected";

 	case CL_VIRUS:

 	    return "Virus(es) detected";

 	case CL_EMAXREC:

 	    return "Recursion limit exceeded";

 	case CL_EMAXSIZE:

 	    return "File size limit exceeded";

 	case CL_EMAXFILES:

 	    return "Files number limit exceeded";

 	case CL_ERAR:

 	    return "RAR module failure";

 	case CL_EZIP:

 	    return "Zip module failure";

 	case CL_EMALFZIP:

 	    return "Malformed Zip detected";

 	case CL_EGZIP:

 	    return "GZip module failure";

 	case CL_EMSCOMP:

 	    return "MS Expand module failure";

 	case CL_EMSCAB:

 	    return "MS CAB module failure";

 	case CL_EOLE2:

 	    return "OLE2 module failure";

 	case CL_ETMPFILE:

 	    return "Unable to create temporary file";

 	case CL_ETMPDIR:

 	    return "Unable to create temporary directory";

 	case CL_EFSYNC:

 	    return "Unable to synchronize file <-> disk";

 	case CL_EMEM:

 	    return "Unable to allocate memory";

 	case CL_EOPEN:

 	    return "Unable to open file or directory";

 	case CL_EMALFDB:

 	    return "Malformed database";

 	case CL_EPATSHORT:

 	    return "Too short pattern detected";

 	case CL_ECVD:

 	    return "Broken or not a CVD file";

 	case CL_ECVDEXTR:

 	    return "CVD extraction failure";

 	case CL_EMD5:

 	    return "MD5 verification error";

 	case CL_EDSIG:

 	    return "Digital signature verification error";

 	case CL_ENULLARG:

 	    return "Null argument passed while initialized is required";
 	case CL_EIO:
 	    return "Input/Output error";

 	case CL_EFORMAT:
 	    return "Bad format or broken data";

 	default:

 	    return "Unknown error code";

     }
 }
 

 const char *cl_perror(int clerror)

 {
     return cl_strerror(clerror);
 }
 

 char *cli_md5stream(FILE *fs, unsigned char *digcpy)

 {

 	unsigned char digest[16];
 	char buff[FILEBUFF];
 	struct MD5Context ctx;
 	char *md5str, *pt;
 	int i, bytes;
 
 
     MD5Init(&ctx);

     while((bytes = fread(buff, 1, FILEBUFF, fs)))
 	MD5Update(&ctx, buff, bytes);
 
     MD5Final(digest, &ctx);
 
     if(!(md5str = (char *) cli_calloc(32 + 1, sizeof(char))))
 	return NULL;

     pt = md5str;
     for(i = 0; i < 16; i++) {
 	sprintf(pt, "%02x", digest[i]);
 	pt += 2;
     }

     if(digcpy)
 	memcpy(digcpy, digest, 16);

     return md5str;

 }
 

 char *cli_md5file(const char *filename)

 {

 	FILE *fs;

 	char *md5str;
 

     if((fs = fopen(filename, "rb")) == NULL) {

 	cli_errmsg("cli_md5file(): Can't read file %s\n", filename);
 	return NULL;
     }
 

     md5str = cli_md5stream(fs, NULL);
     fclose(fs);

     return md5str;

 }
 

 static char *cli_md5buff(const char *buffer, unsigned int len)

 {

 	unsigned char digest[16];
 	char *md5str, *pt;
 	struct MD5Context ctx;
 	int i;

     MD5Init(&ctx);
     MD5Update(&ctx, buffer, len);
     MD5Final(digest, &ctx);
     memcpy(oldmd5buff, digest, 16);

     if(!(md5str = (char *) cli_calloc(32 + 1, sizeof(char))))
 	return NULL;

     pt = md5str;
     for(i = 0; i < 16; i++) {
 	sprintf(pt, "%02x", digest[i]);
 	pt += 2;
     }

     return md5str;

 }
 
 void *cli_malloc(size_t size)
 {
 	void *alloc;
 

     if(size > MAX_ALLOCATION || size < 0) {
 	cli_errmsg("Attempt to allocate %d bytes. Please report to bugs@clamav.net\n", size);

 	return NULL;
     }
 

     alloc = malloc(size);
 
     if(!alloc) {
 	cli_errmsg("cli_malloc(): Can't allocate memory (%d bytes).\n", size);
 	perror("malloc_problem");

 	/* _exit(1); */

 	return NULL;
     } else return alloc;
 }
 
 void *cli_calloc(size_t nmemb, size_t size)
 {
 	void *alloc;
 

 
     if(size > MAX_ALLOCATION || size < 0) {
 	cli_errmsg("Attempt to allocate %d bytes. Please report to bugs@clamav.net\n", size);

 	return NULL;
     }
 

     alloc = calloc(nmemb, size);
 
     if(!alloc) {
 	cli_errmsg("cli_calloc(): Can't allocate memory (%d bytes).\n", nmemb * size);
 	perror("calloc_problem");

 	/* _exit(1); */

 	return NULL;
     } else return alloc;
 }
 

 void *cli_realloc(void *ptr, size_t size)
 {
 	void *alloc;
 

     alloc = realloc(ptr, size);
 
     if(!alloc) {
 	cli_errmsg("cli_realloc(): Can't re-allocate memory to %d byte.\n", size);
 	perror("realloc_problem");
 	return NULL;
     } else return alloc;
 }
 

 unsigned int cli_rndnum(unsigned int max)

 {
     struct timeval tv;
 
   gettimeofday(&tv, (struct timezone *) 0);
   srand(tv.tv_usec+clock());
 
   return rand() % max;
 }
 

 void cl_settempdir(const char *dir, short leavetemps)
 {
 	char *var;
 
     if(dir) {
 	var = (char *) cli_malloc(8 + strlen(dir));
 	sprintf(var, "TMPDIR=%s", dir);
 	if(!putenv(var))
 	    cli_dbgmsg("Setting %s as global temporary directory\n", dir);
 	else
 	    cli_warnmsg("Can't set TMPDIR variable - insufficient space in the environment.\n");
 
 	/* WARNING: var must not be released - see putenv(3) */
     }
 
     cli_leavetemps_flag = leavetemps;
 }
 

 char *cli_gentemp(const char *dir)

 {

 	char *name, *tmp;
         const char *mdir;

 	unsigned char salt[16 + 32];
 	int i;

 	struct stat foo;
 

     if(!dir)
 	mdir = "/tmp";
     else
 	mdir = (char *) dir;
 

     name = (char*) cli_calloc(strlen(mdir) + 1 + 16 + 1 + 7, sizeof(char));

     if(name == NULL) {

 	cli_dbgmsg("cli_gentemp('%s'): out of memory\n", dir);

 	return NULL;
     }

 
 #ifdef CL_THREAD_SAFE

     pthread_mutex_lock(&cli_gentemp_mutex);

 #endif
 
     memcpy(salt, oldmd5buff, 16);

 
     do {

 	for(i = 16; i < 48; i++)

 	    salt[i] = cli_rndnum(255);

 	tmp = cli_md5buff(( char* ) salt, 48);

 	sprintf(name, "%s/clamav-", mdir);

 	strncat(name, tmp, 16);

 	free(tmp);
     } while(stat(name, &foo) != -1);
 

 #ifdef CL_THREAD_SAFE

     pthread_mutex_unlock(&cli_gentemp_mutex);

 #endif
 

     return(name);
 }
 
 int cli_rmdirs(const char *dirname)
 {
 	DIR *dd;
 	struct dirent *dent;

 #if defined(HAVE_READDIR_R_3) || defined(HAVE_READDIR_R_2)
 	struct dirent result;
 #endif

 	struct stat maind, statbuf;
 	char *fname;
 

 
     chmod(dirname, 0700);

     if((dd = opendir(dirname)) != NULL) {
 	while(stat(dirname, &maind) != -1) {
 	    if(!rmdir(dirname)) break;
 

 #ifdef HAVE_READDIR_R_3
 	    while(!readdir_r(dd, &result, &dent) && dent) {
 #elif defined(HAVE_READDIR_R_2)
 	    while((dent = (struct dirent *) readdir_r(dd, &result))) {
 #else

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

 #endif

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

 		    if(strcmp(dent->d_name, ".") && strcmp(dent->d_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(rmdir(fname) == -1) { /* can't be deleted */
 				    if(errno == EACCES) {
 					cli_errmsg("Can't remove some temporary directories due to access problem.\n");
 					closedir(dd);

 					free(fname);

 					return 0;
 				    }
 				    cli_rmdirs(fname);
 				}
 			    } else
 				unlink(fname);
 			}
 
 			free(fname);
 		    }
 		}
 	    }
 
 	    rewinddir(dd);
 
 	}
 
     } else { 
 	return 53;
     }
 
     closedir(dd);
     return 0;
 }

 
 /* Function: readn
         Try hard to read the requested number of bytes
 */
 int cli_readn(int fd, void *buff, unsigned int count)
 {
         int retval;
         unsigned int todo;
         unsigned char *current;

         todo = count;
         current = (unsigned char *) buff;

         do {
                 retval = read(fd, current, todo);
                 if (retval == 0) {
                         return (count - todo);
                 }
                 if (retval < 0) {

 			if (errno == EINTR) {
 				continue;
 			}

                         return -1;
                 }
                 todo -= retval;
                 current += retval;
         } while (todo > 0);

         return count;
 }

 /* Function: writen
         Try hard to write the specified number of bytes
 */
 int cli_writen(int fd, void *buff, unsigned int count)
 {
         int retval;
         unsigned int todo;
         unsigned char *current;

         todo = count;
         current = (unsigned char *) buff;

         do {
                 retval = write(fd, current, todo);
                 if (retval < 0) {

 			if (errno == EINTR) {
 				continue;
 			}

                         return -1;
                 }
                 todo -= retval;
                 current += retval;
         } while (todo > 0);

         return count;
 }
 

 int32_t cli_readint32(const char *buff)
 {

 	int32_t ret;

 
 #if WORDS_BIGENDIAN == 0
     ret = *(int32_t *) buff;
 #else

 	int32_t shift, i = 0;
 

     ret = 0;
     for(shift = 0; shift < 32; shift += 8) {
       ret |= (buff[i] & 0xff ) << shift;
       i++;
     }
 #endif
 
     return ret;
 }

 
 int cli_memstr(const char *haystack, int hs, const char *needle, int ns)
 {
 	const char *pt, *hay;
 	int n;
 
 
     if(hs < ns)
 	return 0;
 
     if(haystack == needle)
 	return 1;
 
     if(!memcmp(haystack, needle, ns))
 	return 1;
 
     pt = hay = haystack;
     n = hs;
 
     while((pt = memchr(hay, needle[0], n)) != NULL) {

 	n -= (int) pt - (int) hay;

 	if(n < ns)
 	    break;
 
 	if(!memcmp(pt, needle, ns))
 	    return 1;
 

 	if(hay == pt) {
 	    n--;
 	    hay++;
 	} else {
 	    hay = pt;
 	}

     }
 
     return 0;
 }