| 1 | /* |
| 2 | * trx.c |
| 3 | * |
| 4 | * Copyright (C) 2005 Mike Baker |
| 5 | * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version 2 |
| 10 | * of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 20 | */ |
| 21 | |
| 22 | #include <stdio.h> |
| 23 | #include <stdlib.h> |
| 24 | #include <stddef.h> |
| 25 | #include <unistd.h> |
| 26 | #include <fcntl.h> |
| 27 | #include <sys/mman.h> |
| 28 | #include <sys/stat.h> |
| 29 | #include <string.h> |
| 30 | |
| 31 | #include <sys/ioctl.h> |
| 32 | #include "mtd-api.h" |
| 33 | #include "mtd.h" |
| 34 | #include "crc32.h" |
| 35 | |
| 36 | #define TRX_MAGIC 0x30524448 /* "HDR0" */ |
| 37 | struct trx_header { |
| 38 | unsigned magic; /* "HDR0" */ |
| 39 | unsigned len; /* Length of file including header */ |
| 40 | unsigned crc32; /* 32-bit CRC from flag_version to end of file */ |
| 41 | unsigned flag_version; /* 0:15 flags, 16:31 version */ |
| 42 | unsigned offsets[3]; /* Offsets of partitions from start of header */ |
| 43 | }; |
| 44 | |
| 45 | int |
| 46 | trx_fixup(int fd, const char *name) |
| 47 | { |
| 48 | struct mtd_info_user mtdInfo; |
| 49 | unsigned long len; |
| 50 | struct trx_header *trx; |
| 51 | void *ptr, *scan; |
| 52 | int bfd; |
| 53 | |
| 54 | if (ioctl(fd, MEMGETINFO, &mtdInfo) < 0) { |
| 55 | fprintf(stderr, "Failed to get mtd info\n"); |
| 56 | goto err; |
| 57 | } |
| 58 | |
| 59 | len = mtdInfo.size; |
| 60 | if (mtdInfo.size <= 0) { |
| 61 | fprintf(stderr, "Invalid MTD device size\n"); |
| 62 | goto err; |
| 63 | } |
| 64 | |
| 65 | bfd = mtd_open(name, true); |
| 66 | ptr = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_SHARED, bfd, 0); |
| 67 | if (!ptr || (ptr == (void *) -1)) { |
| 68 | perror("mmap"); |
| 69 | goto err1; |
| 70 | } |
| 71 | |
| 72 | trx = ptr; |
| 73 | if (trx->magic != TRX_MAGIC) { |
| 74 | fprintf(stderr, "TRX header not found\n"); |
| 75 | goto err; |
| 76 | } |
| 77 | |
| 78 | scan = ptr + offsetof(struct trx_header, flag_version); |
| 79 | trx->crc32 = crc32buf(scan, trx->len - (scan - ptr)); |
| 80 | msync(ptr, sizeof(struct trx_header), MS_SYNC|MS_INVALIDATE); |
| 81 | munmap(ptr, len); |
| 82 | close(bfd); |
| 83 | return 0; |
| 84 | |
| 85 | err1: |
| 86 | close(bfd); |
| 87 | err: |
| 88 | fprintf(stderr, "Error fixing up TRX header\n"); |
| 89 | return -1; |
| 90 | } |
| 91 | |
| 92 | int |
| 93 | trx_check(int imagefd, const char *mtd, char *buf, int *len) |
| 94 | { |
| 95 | const struct trx_header *trx = (const struct trx_header *) buf; |
| 96 | int fd; |
| 97 | |
| 98 | if (strcmp(mtd, "linux") != 0) |
| 99 | return 1; |
| 100 | |
| 101 | *len = read(imagefd, buf, 32); |
| 102 | if (*len < 32) { |
| 103 | fprintf(stdout, "Could not get image header, file too small (%d bytes)\n", *len); |
| 104 | return 0; |
| 105 | } |
| 106 | |
| 107 | if (trx->magic != TRX_MAGIC || trx->len < sizeof(struct trx_header)) { |
| 108 | if (quiet < 2) { |
| 109 | fprintf(stderr, "Bad trx header\n"); |
| 110 | fprintf(stderr, "This is not the correct file format; refusing to flash.\n" |
| 111 | "Please specify the correct file or use -f to force.\n"); |
| 112 | } |
| 113 | return 0; |
| 114 | } |
| 115 | |
| 116 | /* check if image fits to mtd device */ |
| 117 | fd = mtd_check_open(mtd); |
| 118 | if(fd < 0) { |
| 119 | fprintf(stderr, "Could not open mtd device: %s\n", mtd); |
| 120 | exit(1); |
| 121 | } |
| 122 | |
| 123 | if(mtdsize < trx->len) { |
| 124 | fprintf(stderr, "Image too big for partition: %s\n", mtd); |
| 125 | close(fd); |
| 126 | return 0; |
| 127 | } |
| 128 | |
| 129 | close(fd); |
| 130 | return 1; |
| 131 | } |
| 132 | |
| 133 | |
