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/*
* patcher.c - ADAM2 patcher for Netgear DG834 (and compatible)
*
* Copyright (C) 2006 Felix Fietkau
*
* 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdint.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <string.h>
#include <sys/ioctl.h>
int main(int argc, char **argv)
{
int fd;
char *ptr;
uint32_t *i;
if (argc != 2) {
fprintf(stderr, "Usage: %s <filename>\n", argv[0]);
exit(1);
}
if (((fd = open(argv[1], O_RDWR)) < 0)
|| ((ptr = mmap(0, 128 * 1024, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == (void *) (-1))) {
fprintf(stderr, "Can't open file\n");
exit(1);
}
i = (uint32_t *) &ptr[0x3944];
if (*i == 0x0c000944) {
fprintf(stderr, "Unpatched ADAM2 detected. Patching... ");
*i = 0x00000000;
msync(i, sizeof(*i), MS_SYNC|MS_INVALIDATE);
fprintf(stderr, "done!\n");
} else if (*i == 0x00000000) {
fprintf(stderr, "Patched ADAM2 detected.\n");
} else {
fprintf(stderr, "Unknown ADAM2 detected. Can't patch!\n");
}
close(fd);
}
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