/* * 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); }