Holger Hans Peter Freyther | 2281797 | 2009-12-23 12:52:30 +0100 | [diff] [blame] | 1 | /* Routines for parsing an ipacces SDP firmware file */ |
| 2 | |
| 3 | /* (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org> |
| 4 | * All Rights Reserved |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (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 | * You should have received a copy of the GNU General Public License along |
| 17 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 19 | * |
| 20 | */ |
| 21 | |
Holger Hans Peter Freyther | 93e2976 | 2009-12-23 13:09:27 +0100 | [diff] [blame] | 22 | #include <arpa/inet.h> |
Holger Hans Peter Freyther | 2281797 | 2009-12-23 12:52:30 +0100 | [diff] [blame] | 23 | #include <sys/types.h> |
| 24 | #include <sys/stat.h> |
| 25 | #include <fcntl.h> |
| 26 | #include <unistd.h> |
| 27 | #include <stdio.h> |
| 28 | #include <stdlib.h> |
| 29 | #include <string.h> |
| 30 | |
Holger Hans Peter Freyther | 0a4deca | 2009-12-29 05:43:57 +0100 | [diff] [blame^] | 31 | #define PART_LENGTH 138 |
Holger Hans Peter Freyther | 2281797 | 2009-12-23 12:52:30 +0100 | [diff] [blame] | 32 | |
Holger Hans Peter Freyther | 0306798 | 2009-12-24 10:19:51 +0100 | [diff] [blame] | 33 | struct sdp_firmware { |
| 34 | char magic[4]; |
| 35 | char more_magic[4]; |
| 36 | unsigned int header_length; |
| 37 | unsigned int file_length; |
| 38 | char sw_part[20]; |
| 39 | char text1[122]; |
Holger Hans Peter Freyther | 0a4deca | 2009-12-29 05:43:57 +0100 | [diff] [blame^] | 40 | unsigned int short part_length; |
Holger Hans Peter Freyther | 0306798 | 2009-12-24 10:19:51 +0100 | [diff] [blame] | 41 | /* stuff i don't know */ |
| 42 | } __attribute__((packed)); |
| 43 | |
Holger Hans Peter Freyther | e4cef6c | 2009-12-23 13:03:12 +0100 | [diff] [blame] | 44 | /* more magic, the second "int" in the header */ |
| 45 | static char more_magic[] = { 0x10, 0x02, 0x00, 0x0 }; |
| 46 | |
Holger Hans Peter Freyther | 2281797 | 2009-12-23 12:52:30 +0100 | [diff] [blame] | 47 | |
| 48 | static void analyze_file(int fd) |
| 49 | { |
Holger Hans Peter Freyther | 0306798 | 2009-12-24 10:19:51 +0100 | [diff] [blame] | 50 | struct sdp_firmware *firmware_header; |
Holger Hans Peter Freyther | b7f5313 | 2009-12-27 14:03:11 +0100 | [diff] [blame] | 51 | struct stat stat; |
Holger Hans Peter Freyther | 2281797 | 2009-12-23 12:52:30 +0100 | [diff] [blame] | 52 | char buf[4096]; |
| 53 | int rc; |
| 54 | |
Holger Hans Peter Freyther | 0306798 | 2009-12-24 10:19:51 +0100 | [diff] [blame] | 55 | rc = read(fd, buf, sizeof(*firmware_header)); |
| 56 | if (rc < 0) { |
| 57 | perror("can not read header"); |
Holger Hans Peter Freyther | 2281797 | 2009-12-23 12:52:30 +0100 | [diff] [blame] | 58 | return; |
| 59 | } |
| 60 | |
Holger Hans Peter Freyther | 0306798 | 2009-12-24 10:19:51 +0100 | [diff] [blame] | 61 | firmware_header = (struct sdp_firmware *) &buf[0]; |
| 62 | if (strncmp(firmware_header->magic, " SDP", 4) != 0) { |
| 63 | fprintf(stderr, "Wrong magic.\n"); |
Holger Hans Peter Freyther | 2281797 | 2009-12-23 12:52:30 +0100 | [diff] [blame] | 64 | return; |
| 65 | } |
| 66 | |
Holger Hans Peter Freyther | 0306798 | 2009-12-24 10:19:51 +0100 | [diff] [blame] | 67 | if (memcmp(firmware_header->more_magic, more_magic, 4) != 0) { |
| 68 | fprintf(stderr, "Wrong more magic.\n"); |
Holger Hans Peter Freyther | e4cef6c | 2009-12-23 13:03:12 +0100 | [diff] [blame] | 69 | return; |
| 70 | } |
| 71 | |
Holger Hans Peter Freyther | 2281797 | 2009-12-23 12:52:30 +0100 | [diff] [blame] | 72 | printf("Printing header information:\n"); |
Holger Hans Peter Freyther | 0306798 | 2009-12-24 10:19:51 +0100 | [diff] [blame] | 73 | printf("header_length: %u\n", ntohl(firmware_header->header_length)); |
| 74 | printf("file_length: %u\n", ntohl(firmware_header->file_length)); |
| 75 | printf("sw_part: %.20s\n", firmware_header->sw_part); |
Holger Hans Peter Freyther | 0a4deca | 2009-12-29 05:43:57 +0100 | [diff] [blame^] | 76 | printf("text1: %.120s\n", firmware_header->text1); |
| 77 | printf("items: %u (rest %u)\n", ntohs(firmware_header->part_length) / PART_LENGTH, |
| 78 | ntohs(firmware_header->part_length) % PART_LENGTH); |
Holger Hans Peter Freyther | b7f5313 | 2009-12-27 14:03:11 +0100 | [diff] [blame] | 79 | |
| 80 | /* verify the file */ |
| 81 | if (fstat(fd, &stat) == -1) { |
| 82 | perror("Can not stat the file"); |
| 83 | return; |
| 84 | } |
| 85 | |
| 86 | if (ntohl(firmware_header->file_length) != stat.st_size) { |
| 87 | fprintf(stderr, "The filesize and the header do not match.\n"); |
| 88 | return; |
| 89 | } |
Holger Hans Peter Freyther | 2281797 | 2009-12-23 12:52:30 +0100 | [diff] [blame] | 90 | } |
| 91 | |
| 92 | int main(int argc, char** argv) |
| 93 | { |
| 94 | int i, fd; |
| 95 | |
| 96 | for (i = 1; i < argc; ++i) { |
| 97 | printf("Opening possible firmware '%s'\n", argv[i]); |
| 98 | fd = open(argv[i], O_RDONLY); |
| 99 | if (!fd) { |
| 100 | perror("nada"); |
| 101 | continue; |
| 102 | } |
| 103 | |
| 104 | analyze_file(fd); |
| 105 | } |
| 106 | |
| 107 | return EXIT_SUCCESS; |
| 108 | } |