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/*
* Copyright (C) 2009 Sourcefire, Inc.
*
* Authors: aCaB
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
/* 7zip scanner */
#if HAVE_CONFIG_H
#include "clamav-config.h"
#endif
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "others.h"
#include "lzma_iface.h"
#include "scanners.h"
#include "matcher.h"
#include "7z/7zFile.h"
#include "7z/7zCrc.h"
#include "7z/Archive/7z/7zIn.h"
#include "7z/Archive/7z/7zExtract.h"
static ISzAlloc allocImp = { __lzma_wrap_alloc, __lzma_wrap_free}, allocTempImp = { __lzma_wrap_alloc, __lzma_wrap_free};
int cli_7unz (int fd, cli_ctx *ctx) {
CFileInStream archiveStream;
CLookToRead lookStream;
CSzArEx db;
UInt32 blockIndex = 0xFFFFFFFF;
unsigned char *buf = NULL;
size_t bufsz = 0;
UInt32 i;
int dupfd, ret = CL_CLEAN;
unsigned int fu=0;
if((dupfd = dup(fd)) == -1) {
cli_errmsg("cli_7unz: dup() failed\n");
return CL_EDUP;
}
FileInStream_CreateVTable(&archiveStream);
archiveStream.file.file = fdopen(dupfd, "rb");
if(!archiveStream.file.file) {
cli_errmsg("cli_7unz: fdopen() failed\n");
return CL_EOPEN;
}
LookToRead_CreateVTable(&lookStream, False);
lookStream.realStream = &archiveStream.s;
LookToRead_Init(&lookStream);
SzArEx_Init(&db);
if(SzArEx_Open(&db, &lookStream.s, &allocImp, &allocTempImp) != SZ_OK) {
SzArEx_Free(&db, &allocImp);
cli_dbgmsg("cli_7unz: possibly damaged archive\n");
fclose(archiveStream.file.file);
return CL_CLEAN;
}
for (i = 0; i < db.db.NumFiles; i++) {
CSzFileItem *f = db.db.Files + i;
size_t offset;
size_t usize;
if(f->IsDir || !f->Size) continue;
if(ctx->engine->maxfilesize && f->Size > ctx->engine->maxfilesize) {
cli_dbgmsg("cli_7unz: skipping stream due to size limits (%llu vs %llu)\n", (long long)f->Size, (long long)ctx->engine->maxfilesize);
continue;
}
if(cli_matchmeta(ctx, f->Name, 0, f->Size, 0, i + 1, 0, NULL) == CL_VIRUS) {
ret = CL_VIRUS;
break;
}
if (ctx->engine->maxfiles && fu>=ctx->engine->maxfiles) {
cli_dbgmsg("cli_7unz: Files limit reached (max: %u)\n", ctx->engine->maxfiles);
ret=CL_EMAXFILES;
break;
}
cli_dbgmsg("cli_7unz: Extracting file %s\n", f->Name);
if(SzAr_Extract(&db, &lookStream.s, i, &blockIndex, &buf, &bufsz, &offset, &usize, &allocImp, &allocTempImp) == SZ_OK) {
char *fname;
int ofd;
if(!usize) {
cli_dbgmsg("cli_7unz: stream uncompressed to an empty file\n");
continue;
}
fu++;
if(!(fname = cli_gentemp(ctx->engine->tmpdir))) {
ret = CL_EMEM;
break;
}
if((ofd = open(fname, O_RDWR|O_CREAT|O_TRUNC|O_BINARY, S_IRUSR|S_IWUSR)) < 0) {
cli_errmsg("cli_7unz: failed to create file %s\n", fname);
free(fname);
ret = CL_ECREAT;
break;
}
if(cli_writen(ofd, buf, usize) <= 0) {
close(ofd);
if(cli_unlink(fname)) ret = CL_EUNLINK;
else ret = CL_EWRITE;
free(fname);
break;
}
cli_dbgmsg("cli_7unz: extracted to %s\n", fname);
lseek(ofd, 0, SEEK_SET);
ret = cli_magic_scandesc(ofd, ctx);
close(ofd);
if(!ctx->engine->keeptmp)
if(cli_unlink(fname)) ret = CL_EUNLINK;
free(fname);
if(ret == CL_EUNLINK || ret == CL_VIRUS)
break;
} else {
cli_dbgmsg("cli_7unz: decompression failed\n");
}
}
if(buf) free(buf);
SzArEx_Free(&db, &allocImp);
fclose(archiveStream.file.file);
return ret;
}
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