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/*
* Copyright (C) 1999-2002 Tomasz Kojm <zolw@konarski.edu.pl>
*
* 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 <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 "clamav.h"
#include "others.h"
#include "md5.h"
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int cli_debug_flag = 0;
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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;
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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; |
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}
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char *cl_strerror(int clerror) |
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{
switch(clerror) {
case CL_CLEAN:
return "Virus NOT found.";
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_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."; |
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case CL_ECVD:
return "Broken or not a CVD file."; |
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case CL_ECVDEXTR: |
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return "CVD extraction failure.";
case CL_EMD5:
return "MD5 verification error.";
case CL_EDSIG:
return "Digital signature verification error."; |
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case CL_ENULLARG: |
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return "Null argument passed while initialized is required."; |
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default:
return "Unknown error code.";
}
}
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char *cl_perror(int clerror)
{
return cl_strerror(clerror);
}
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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);
}
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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);
}
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char *cl_md5buff(const char *buffer, unsigned int len)
{
unsigned char md5buf[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, &md5buf);
md5str = (char*) cli_calloc(32 + 1, sizeof(char));
for(i=0; i<16; i++)
cnt += sprintf(md5str + cnt, "%02x", md5buf[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");
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");
return NULL;
} else return alloc;
}
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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;
}
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#ifndef C_URANDOM
/* it's very weak */ |
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#include <sys/time.h> |
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unsigned int cl_rndnum(unsigned int max) |
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{
struct timeval tv;
gettimeofday(&tv, (struct timezone *) 0);
srand(tv.tv_usec+clock());
return rand() % max;
}
#else
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unsigned int cl_rndnum(unsigned int max) |
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{ |
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FILE *fd; |
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unsigned int generated;
char *byte;
int size;
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if((fd = fopen("/dev/urandom", "rb")) == NULL) {
cli_errmsg("!Can't open /dev/urandom.\n");
return -1; |
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}
byte = (char *) &generated;
size = sizeof(generated);
do {
int bread;
bread = fread(byte, 1, size, fd);
size -= bread;
byte += bread;
} while(size > 0);
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fclose(fd); |
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return generated % max;
}
#endif
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/* it uses MD5 to avoid potential races in tmp */
char *cl_gentemp(const char *dir) |
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{
char *name, *mdir, *tmp;
unsigned char salt[32];
int cnt=0, i;
struct stat foo;
if(!dir)
mdir = "/tmp";
else
mdir = (char *) dir;
name = (char*) cli_calloc(strlen(mdir) + 1 + 16 + 1, sizeof(char)); |
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if(name == NULL) {
cli_dbgmsg("cl_gentemp('%s'): out of memory\n", dir);
return NULL;
} |
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cnt += sprintf(name, "%s/", mdir);
do {
for(i = 0; i < 32; i++) |
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salt[i] = cl_rndnum(255); |
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tmp = cl_md5buff(salt, 32);
strncat(name, tmp, 16);
free(tmp);
} while(stat(name, &foo) != -1);
return(name);
}
int cli_rmdirs(const char *dirname)
{
DIR *dd;
struct dirent *dent;
struct stat maind, statbuf;
char *fname;
if((dd = opendir(dirname)) != NULL) {
while(stat(dirname, &maind) != -1) {
if(!rmdir(dirname)) break;
while((dent = readdir(dd))) {
if(dent->d_ino) {
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); |
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free(fname); |
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return 0;
}
cli_rmdirs(fname);
}
} else
unlink(fname);
}
free(fname);
}
}
}
rewinddir(dd);
}
} else {
return 53;
}
closedir(dd);
return 0;
}
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