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168 lines
3.3 KiB
168 lines
3.3 KiB
/*
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* Copyright (C) 2007-2008 Sourcefire, Inc.
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*
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* Authors: Tomasz Kojm
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#if HAVE_CONFIG_H
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#include "clamav-config.h"
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#endif
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#include <stdio.h>
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#include <stddef.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include "clamav.h"
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#include "cltypes.h"
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#include "others.h"
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#include "msexpand.h"
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#ifndef HAVE_ATTRIB_PACKED
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#define __attribute__(x)
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#endif
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#ifdef HAVE_PRAGMA_PACK
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#pragma pack(1)
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#endif
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#ifdef HAVE_PRAGMA_PACK_HPPA
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#pragma pack 1
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#endif
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#define EC32(x) le32_to_host(x)
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#define EC16(x) le16_to_host(x)
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#define MAGIC1 0x44445a53
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#define MAGIC2 0x3327f088
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#define MAGIC3 0x0041
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struct msexp_hdr {
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uint32_t magic1;
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uint32_t magic2;
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uint16_t magic3;
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uint32_t fsize;
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} __attribute__((packed));
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#ifdef HAVE_PRAGMA_PACK
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#pragma pack()
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#endif
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#ifdef HAVE_PRAGMA_PACK_HPPA
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#pragma pack
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#endif
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#define BSIZE 4096
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#define RWBUFF 2048
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#define READBYTES \
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ret = cli_readn(fd, rbuff, RWBUFF); \
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if(ret == -1) \
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return CL_EIO; \
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if(!ret) \
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break; \
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rbytes = (unsigned int) ret; \
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r = 0;
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#define WRITEBYTES \
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ret = cli_writen(ofd, wbuff, w); \
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if(ret == -1 || (unsigned int) ret != w) \
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return CL_EIO; \
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wbytes += w; \
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if(wbytes >= EC32(hdr.fsize)) \
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return CL_SUCCESS; \
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w = 0;
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int cli_msexpand(int fd, int ofd, cli_ctx *ctx)
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{
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struct msexp_hdr hdr;
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uint8_t i, mask, bits;
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unsigned char buff[BSIZE], rbuff[RWBUFF], wbuff[RWBUFF];
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unsigned int j = BSIZE - 16, k, l, r = 0, w = 0, rbytes = 0, wbytes = 0;
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int ret;
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if(cli_readn(fd, &hdr, sizeof(hdr)) == -1)
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return CL_EIO;
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if(EC32(hdr.magic1) != MAGIC1 || EC32(hdr.magic2) != MAGIC2 || EC16(hdr.magic3) != MAGIC3) {
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cli_dbgmsg("MSEXPAND: Not supported file format\n");
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return CL_EFORMAT;
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}
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cli_dbgmsg("MSEXPAND: File size from header: %u\n", EC32(hdr.fsize));
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if(cli_checklimits("MSEXPAND", ctx, EC32(hdr.fsize), 0, 0)!=CL_CLEAN)
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return CL_SUCCESS;
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while(1) {
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if(!rbytes || (r == rbytes)) {
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READBYTES;
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}
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bits = rbuff[r]; r++;
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mask = 1;
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for(i = 0; i < 8; i++) {
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if(bits & mask) {
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if(r == rbytes) {
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READBYTES;
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}
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if(w == RWBUFF) {
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WRITEBYTES;
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}
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wbuff[w] = buff[j] = rbuff[r];
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r++; w++;
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j++; j %= BSIZE;
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} else {
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if(r == rbytes) {
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READBYTES;
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}
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k = rbuff[r]; r++;
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if(r == rbytes) {
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READBYTES;
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}
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l = rbuff[r]; r++;
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k += (l & 0xf0) << 4;
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l = (l & 0x0f) + 3;
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while(l--) {
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if(w == RWBUFF) {
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WRITEBYTES;
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}
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wbuff[w] = buff[j] = buff[k];
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w++;
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k++; k %= BSIZE;
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j++; j %= BSIZE;
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}
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}
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mask *= 2;
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}
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}
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if(w) {
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WRITEBYTES;
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}
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return CL_SUCCESS;
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}
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