/*
* 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 cl_gentemp_mutex = PTHREAD_MUTEX_INITIALIZER;
#endif
#include "clamav.h"
#include "others.h"
#include "md5.h"
#define CL_FLEVEL 2 /* don't touch it */
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_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";
default:
return "Unknown error code";
}
}
const char *cl_perror(int clerror)
{
return cl_strerror(clerror);
}
char *cl_md5file(const char *filename)
{
FILE *fd;
unsigned char buffer[16];
char *md5str;
int i, cnt=0;
if((fd = fopen(filename, "rb")) == NULL) {
cli_errmsg("md5_file(): Can't read file %s\n", filename);
return NULL;
}
md5_stream(fd, &buffer);
fclose(fd);
md5str = (char*) calloc(32 + 1, sizeof(char));
for(i=0; i<16; i++)
cnt += sprintf(md5str + cnt, "%02x", buffer[i]);
return(md5str);
}
char *cli_md5stream(FILE *fd)
{
unsigned char buffer[16];
char *md5str;
int i, cnt=0;
md5_stream(fd, &buffer);
md5str = (char*) calloc(32 + 1, sizeof(char));
for(i=0; i<16; i++)
cnt += sprintf(md5str + cnt, "%02x", buffer[i]);
return(md5str);
}
char *cl_md5buff(const char *buffer, unsigned int len)
{
unsigned char md5buff[16];
char *md5str;
struct md5_ctx ctx;
int i, cnt=0;
md5_init_ctx(&ctx);
md5_process_bytes(buffer, len, &ctx);
md5_finish_ctx(&ctx, &md5buff);
memcpy(oldmd5buff, md5buff, 16);
md5str = (char*) cli_calloc(32 + 1, sizeof(char));
for(i=0; i<16; i++)
cnt += sprintf(md5str + cnt, "%02x", md5buff[i]);
return(md5str);
}
void *cli_malloc(size_t size)
{
void *alloc;
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;
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 cl_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 *cl_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("cl_gentemp('%s'): out of memory\n", dir);
return NULL;
}
#ifdef CL_THREAD_SAFE
pthread_mutex_lock(&cl_gentemp_mutex);
#endif
memcpy(salt, oldmd5buff, 16);
do {
for(i = 16; i < 48; i++)
salt[i] = cl_rndnum(255);
tmp = cl_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(&cl_gentemp_mutex);
#endif
return(name);
}
int cli_rmdirs(const char *dirname)
{
DIR *dd;
struct dirent *dent;
struct stat maind, statbuf;
char *fname;
if(cli_leavetemps_flag)
return 0;
chmod(dirname, 0700);
if((dd = opendir(dirname)) != NULL) {
while(stat(dirname, &maind) != -1) {
if(!rmdir(dirname)) break;
while((dent = readdir(dd))) {
#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;
}