1/* 2 * patcher.c - ADAM2 patcher for Netgear DG834 (and compatible) 3 * 4 * Copyright (C) 2006 Felix Fietkau 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 2 9 * of the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 */ 16 17#include <stdio.h> 18#include <stdlib.h> 19#include <stddef.h> 20#include <unistd.h> 21#include <fcntl.h> 22#include <stdint.h> 23#include <sys/mman.h> 24#include <sys/stat.h> 25#include <string.h> 26 27#include <sys/ioctl.h> 28 29int main(int argc, char **argv) 30{ 31 int fd; 32 char *ptr; 33 uint32_t *i; 34 35 if (argc != 2) { 36 fprintf(stderr, "Usage: %s <filename>\n", argv[0]); 37 exit(1); 38 } 39 40 if (((fd = open(argv[1], O_RDWR)) < 0) 41 || ((ptr = mmap(0, 128 * 1024, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == (void *) (-1))) { 42 fprintf(stderr, "Can't open file\n"); 43 exit(1); 44 } 45 46 i = (uint32_t *) &ptr[0x3944]; 47 if (*i == 0x0c000944) { 48 fprintf(stderr, "Unpatched ADAM2 detected. Patching... "); 49 *i = 0x00000000; 50 msync(i, sizeof(*i), MS_SYNC|MS_INVALIDATE); 51 fprintf(stderr, "done!\n"); 52 } else if (*i == 0x00000000) { 53 fprintf(stderr, "Patched ADAM2 detected.\n"); 54 } else { 55 fprintf(stderr, "Unknown ADAM2 detected. Can't patch!\n"); 56 } 57 58 close(fd); 59} 60