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/*
* Copyright (C) 2004 Nigel Horne <njh@bandsman.co.uk>
*
* 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 |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA. |
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* |
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* Much of this code is based on minitar.c which is in the public domain. |
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* Author: Charles G. Waldman (cgw@pgt.com), Aug 4 1998 |
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* There are many tar files that this code cannot decode. |
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*/ |
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static char const rcsid[] = "$Id: untar.c,v 1.32 2006/10/15 11:10:42 njh Exp $";
#if HAVE_CONFIG_H
#include "clamav-config.h"
#endif |
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#include <stdio.h>
#include <errno.h>
#include <string.h> |
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#ifdef HAVE_UNISTD_H |
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#include <unistd.h> |
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#endif |
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#include <sys/stat.h> |
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#include <fcntl.h> |
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#ifdef HAVE_SYS_PARAM_H |
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#include <sys/param.h> /* for NAME_MAX */ |
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#endif |
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#include "clamav.h"
#include "others.h" |
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#include "untar.h" |
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#include "mbox.h" |
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#include "blob.h" |
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#define BLOCKSIZE 512
|
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#ifndef O_BINARY
#define O_BINARY 0
#endif
|
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static int
octal(const char *str) |
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{ |
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int ret; |
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|
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if(sscanf(str, "%o", (unsigned int *)&ret) != 1)
return -1; |
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return ret;
}
int |
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cli_untar(const char *dir, int desc, unsigned int posix) |
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{
int size = 0;
int in_block = 0; |
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char fullname[NAME_MAX + 1]; |
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FILE *outfile = NULL; |
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cli_dbgmsg("In untar(%s, %d)\n", dir ? dir : "", desc);
for(;;) {
char block[BLOCKSIZE]; |
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const int nread = cli_readn(desc, block, (unsigned int)sizeof(block)); |
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if(!in_block && nread == 0)
break;
|
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if(nread < 0) { |
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if(outfile)
fclose(outfile); |
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cli_errmsg("cli_untar: block read error\n"); |
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return CL_EIO;
}
if(!in_block) {
char type; |
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const char *suffix; |
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size_t suffixLen = 0; |
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int fd, directory, skipEntry = 0; |
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char magic[7], name[101], osize[13];
if(outfile) {
if(fclose(outfile)) {
cli_errmsg("cli_untar: cannot close file %s\n", |
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fullname); |
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return CL_EIO;
}
outfile = (FILE*)0;
} |
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|
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if(block[0] == '\0') /* We're done */ |
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break;
|
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/* Notice assumption that BLOCKSIZE > 262 */ |
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if(posix) {
strncpy(magic, block+257, 5);
magic[5] = '\0';
if(strcmp(magic, "ustar") != 0) {
cli_dbgmsg("Incorrect magic string '%s' in tar header\n", magic);
return CL_EFORMAT;
} |
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}
type = block[156];
|
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/*
* Extra types from djgardner@users.sourceforge.net
*/ |
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switch(type) { |
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case '0': /* plain file */
case '\0': /* plain file */
case '7': /* contiguous file */ |
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directory = 0;
break; |
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case '1': /* Link to already archived file */ |
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case '5': /* directory */
case '2': /* sym link */
case '3': /* char device */
case '4': /* block device */
case '6': /* fifo special */ |
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case 'V': /* Volume header */ |
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directory = 1;
break; |
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case 'K':
case 'L':
/* GNU extension - ././@LongLink
* Discard the blocks with the extended filename,
* the last header will contain parts of it anyway
*/
directory = 0;
skipEntry = 1;
break; |
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default: |
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/*cli_errmsg("cli_untar: unknown type flag %c\n", type);
return CL_EFORMAT;*/
/*
* It isn't really a tar file
*/
cli_dbgmsg("cli_untar: unknown type flag %c\n", type);
/*
* We don't know that it's clean at all,
* it would be better to have a
* CL_CONTINUE return value since it
* may be a different format
*/
return CL_CLEAN; |
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}
|
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if(directory) {
in_block = 0; |
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continue; |
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} |
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|
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strncpy(osize, block+124, 12);
osize[12] = '\0';
size = octal(osize);
if(size < 0) {
cli_errmsg("Invalid size in tar header\n"); |
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if(outfile)
fclose(outfile); |
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return CL_EFORMAT;
}
cli_dbgmsg("cli_untar: size = %d\n", size);
if(skipEntry) {
const int nskip = (size % BLOCKSIZE || !size) ? size + BLOCKSIZE - (size % BLOCKSIZE) : size;
cli_dbgmsg("cli_untar: GNU extension, skipping entry\n");
lseek(desc, nskip, SEEK_CUR);
continue;
}
|
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strncpy(name, block, 100);
name[100] = '\0'; |
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|
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/*
* see also fileblobSetFilename()
* TODO: check if the suffix needs to be put back
*/
sanitiseName(name);
suffix = strrchr(name, '.');
if(suffix == NULL)
suffix = "";
else {
suffixLen = strlen(suffix);
if(suffixLen > 4) {
/* Found a full stop which isn't a suffix */
suffix = "";
suffixLen = 0; |
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}
} |
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snprintf(fullname, sizeof(fullname) - 1 - suffixLen, "%s/%.*sXXXXXX", dir,
(int)(sizeof(fullname) - 9 - suffixLen - strlen(dir)), name);
#if defined(C_LINUX) || defined(C_BSD) || defined(HAVE_MKSTEMP) || defined(C_SOLARIS) || defined(C_CYGWIN)
fd = mkstemp(fullname);
#else
(void)mktemp(fullname);
fd = open(fullname, O_WRONLY|O_CREAT|O_EXCL|O_TRUNC|O_BINARY, 0600);
#endif
if(fd < 0) {
cli_errmsg("Can't create temporary file %s: %s\n", fullname, strerror(errno));
cli_dbgmsg("%lu %d %d\n", suffixLen, sizeof(fullname), strlen(fullname));
return CL_ETMPFILE;
}
cli_dbgmsg("cli_untar: extracting %s\n", fullname);
in_block = 1;
if((outfile = fdopen(fd, "wb")) == NULL) {
cli_errmsg("cli_untar: cannot create file %s\n", |
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fullname); |
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close(fd);
return CL_ETMPFILE;
} |
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} else { /* write or continue writing file contents */
const int nbytes = size>512? 512:size; |
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const int nwritten = (int)fwrite(block, 1, (size_t)nbytes, outfile); |
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if(nwritten != nbytes) { |
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cli_errmsg("cli_untar: only wrote %d bytes to file %s (out of disc space?)\n", |
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nwritten, fullname); |
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if(outfile)
fclose(outfile); |
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return CL_EIO; |
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}
size -= nbytes;
} |
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if (size == 0)
in_block = 0; |
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} |
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if(outfile) |
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return fclose(outfile);
|
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return 0; |
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} |