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/*
* Copyright (c) 1995 Matthias Pfaller.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Matthias Pfaller.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: cloak.c,v 1.2 1996/09/05 21:26:50 deraadt Exp $
*/
#include <stdio.h>
#include <unistd.h>
#include <a.out.h>
#include <sys/param.h>
#define SYM_DATA "_input_data"
#define SYM_LEN "_input_len"
void
writex(int fd, void *buf, int cnt, char *prog)
{
if (write(fd, buf, cnt) != cnt) {
perror(prog);
exit(1);
}
}
main(int argc, char **argv)
{
int n, data_len = 0;
static struct exec exec;
static struct nlist nlist[2];
static char buf[10240];
if (argc != 1) {
fprintf(stderr, "usage: %s <file1 >file2", argv[0]);
exit(1);
}
writex(1, &exec, sizeof(exec), argv[0]);
while ((n = read(0, buf, sizeof(buf))) > 0) {
data_len += n;
writex(1, buf, n, argv[0]);
}
memset(buf, 0, sizeof(buf));
if (ALIGN(data_len) - data_len)
writex(1, buf, ALIGN(data_len) - data_len, argv[0]);
writex(1, (void *)&data_len, sizeof(data_len), argv[0]);
n = sizeof(SYM_DATA) + sizeof(SYM_LEN) + sizeof(n);
nlist[0].n_un.n_strx = sizeof(n);
nlist[0].n_type = N_TEXT | N_EXT;
nlist[0].n_value = 0;
nlist[1].n_un.n_strx = nlist[0].n_un.n_strx + sizeof(SYM_DATA);
nlist[1].n_type = N_TEXT | N_EXT;
nlist[1].n_value = ALIGN(data_len);
writex(1, nlist, sizeof(nlist), argv[0]);
writex(1, &n, sizeof(n), argv[0]);
writex(1, SYM_DATA, sizeof(SYM_DATA), argv[0]);
writex(1, SYM_LEN, sizeof(SYM_LEN), argv[0]);
N_SETMAGIC(exec, OMAGIC, MID_MACHINE, 0);
exec.a_text = ALIGN(data_len) + sizeof(data_len);
exec.a_data = 0;
exec.a_bss = 0;
exec.a_syms = sizeof(nlist);
exec.a_trsize = 0;
exec.a_drsize = 0;
lseek(1, (off_t)0, SEEK_SET);
writex(1, &exec, sizeof(exec), argv[0]);
exit(0);
}
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