src/mkdapimg2.c

   1 /*
   2  * This program is free software; you can redistribute it and/or
   3  * modify it under the terms of the GNU General Public License,
   4  * version 2 as published by the Free Software Foundation.
   5  *
   6  * (C) Nicolò Veronese <nicveronese@gmail.com>
   7  */
   8
   9 #include <stdio.h>
  10 #include <stdint.h>
  11 #include <stdlib.h>
  12 #include <unistd.h>
  13 #include <libgen.h>
  14 #include <stdarg.h>
  15 #include <getopt.h>
  16 #include <string.h>
  17 #include <errno.h>
  18
  19 #include <netinet/in.h> // htonl
  20
  21 // Usage: mkdapimg2 -s signature [-v version] [-r region]
  22 //                  [-k uImage block size] -i <input> -o <output>
  23 //
  24 // NOTE: The kernel block size is used to know the offset of the rootfs
  25 // in the image file.
  26 //
  27 // The system writes in the uImage partition until the end of uImage
  28 // is reached, after that, the system jumps to the offset specified with the -k
  29 // parameter and begin writing at the beginning of the rootfs MTD partition.
  30 //
  31 // If the -k parameter is the size of the original uImage partition, the system
  32 // continue writing in the rootfs partition starting from the last block
  33 // that has been wrote. (This is useful if the new kernel size is
  34 // different from the original one)
  35 //
  36 // Example:
  37 // ------------------------------------------
  38 // Creating 7 MTD partitions on "ath-nor0":
  39 // 0x000000000000-0x000000010000 : "u-boot"
  40 // 0x000000010000-0x000000020000 : "ART"
  41 // 0x000000020000-0x000000030000 : "MP"
  42 // 0x000000030000-0x000000040000 : "config"
  43 // 0x000000040000-0x000000120000 : "uImage"
  44 // 0x000000120000-0x000000800000 : "rootfs"
  45 // 0x000000040000-0x000000800000 : "firmware"
  46 // ------------------------------------------
  47 //
  48 // 0x000000120000-0x000000040000 = 0xE0000 -> 917504
  49 //
  50 // e.g.: mkdapimg2 -s HONEYBEE-FIRMWARE-DAP-1330 -v 1.00.21 -r Default
  51 //                 -k 917504 -i sysupgrade.bin -o factory.bin
  52 //
  53 //
  54 // The img_hdr_struct was taken from the D-Link SDK:
  55 // DAP-1330_OSS-firmware_1.00b21/DAP-1330_OSS-firmware_1.00b21/uboot/uboot.patch
  56
  57 #define MAX_SIGN_LEN    32
  58 #define MAX_FW_VER_LEN  16
  59 #define MAX_REG_LEN     8
  60
  61 struct img_hdr_struct {
  62         uint32_t hdr_len;
  63         uint32_t checksum;
  64         uint32_t total_size;
  65         uint32_t kernel_size;
  66         char signature[MAX_SIGN_LEN];
  67         char fw_ver[MAX_FW_VER_LEN];
  68         char fw_reg[MAX_REG_LEN];
  69 } imghdr ;
  70
  71 char *progname;
  72
  73 void
  74 perrexit(int code, char *msg)
  75 {
  76         fprintf(stderr, "%s: %s: %s\n", progname, msg, strerror(errno));
  77         exit(code);
  78 }
  79
  80 void
  81 usage()
  82 {
  83         fprintf(stderr, "usage: %s -s signature [-v version] [-r region] [-k uImage part size] -i <input> -o <output>\n", progname);
  84         exit(1);
  85 }
  86
  87 int
  88 main(int ac, char *av[])
  89 {
  90         char signature[MAX_SIGN_LEN];
  91         char version[MAX_FW_VER_LEN];
  92         char region[MAX_REG_LEN];
  93         int kernel = 0;
  94
  95         FILE *ifile, *ofile;
  96         int c;
  97
  98         uint32_t cksum;
  99         uint32_t bcnt;
 100
 101         progname = basename(av[0]);
 102
 103         memset(signature, 0, sizeof(signature));
 104         memset(version, 0, sizeof(version));
 105         memset(region, 0, sizeof(region));
 106
 107         while ( 1 ) {
 108                 char *ptr;
 109                 int c;
 110
 111                 c = getopt(ac, av, "s:v:r:k:i:o:");
 112                 if (c == -1)
 113                         break;
 114
 115                 switch (c) {
 116                 case 's':
 117                         if (strlen(optarg) > MAX_SIGN_LEN + 1) {
 118                                 fprintf(stderr, "%s: signature exceeds %d chars\n",
 119                                         progname, MAX_SIGN_LEN);
 120                                 exit(1);
 121                         }
 122                         strcpy(signature, optarg);
 123                         break;
 124                 case 'v':
 125                         if (strlen(optarg) > MAX_FW_VER_LEN + 1) {
 126                                 fprintf(stderr, "%s: version exceeds %d chars\n",
 127                                         progname, MAX_FW_VER_LEN);
 128                                 exit(1);
 129                         }
 130                         strcpy(version, optarg);
 131                         break;
 132                 case 'r':
 133                         if (strlen(optarg) > MAX_REG_LEN + 1) {
 134                                 fprintf(stderr, "%s: region exceeds %d chars\n",
 135                                         progname, MAX_REG_LEN);
 136                                 exit(1);
 137                         }
 138                         strcpy(region, optarg);
 139                         break;
 140                 case 'k':
 141                         kernel = strtoul(optarg, &ptr, 0);
 142                         if(ptr[0] == 'k'){
 143                                 kernel *= 1000;
 144                         }
 145                         break;
 146                 case 'i':
 147                         if ((ifile = fopen(optarg, "r")) == NULL)
 148                                 perrexit(1, optarg);
 149                         break;
 150                 case 'o':
 151                         if ((ofile = fopen(optarg, "w")) == NULL)
 152                                 perrexit(1, optarg);
 153                         break;
 154                 default:
 155                         usage();
 156                 }
 157         }
 158
 159         if (signature[0] == 0 || ifile == NULL || ofile == NULL) {
 160                 usage();
 161                 exit(1);
 162         }
 163
 164         for (bcnt = 0, cksum = 0 ; (c = fgetc(ifile)) != EOF ; bcnt++)
 165                 cksum += c & 0xff;
 166
 167         if (fseek(ifile, 0, SEEK_SET) < 0)
 168                 perrexit(2, "fseek on input");
 169
 170         // Fill in the header
 171         memset(&imghdr, 0, sizeof(imghdr));
 172         imghdr.hdr_len = sizeof(imghdr);
 173         imghdr.checksum = htonl(cksum);
 174         imghdr.total_size = htonl(bcnt);
 175         imghdr.kernel_size = htonl(kernel);
 176
 177         strncpy(imghdr.signature, signature, MAX_SIGN_LEN);
 178         strncpy(imghdr.fw_ver, version, MAX_FW_VER_LEN);
 179         strncpy(imghdr.fw_reg, region, MAX_REG_LEN);
 180
 181         if (fwrite(&imghdr, sizeof(imghdr), 1, ofile) < 0)
 182                 perrexit(2, "fwrite header on output");
 183
 184         while ((c = fgetc(ifile)) != EOF) {
 185                 if (fputc(c, ofile) == EOF)
 186                         perrexit(2, "fputc on output");
 187         }
 188
 189         if (ferror(ifile))
 190                 perrexit(2, "fgetc on input");
 191
 192         fclose(ofile);
 193         fclose(ifile);
 194
 195         fprintf(stderr, "imgHdr.hdr_len = %lu\n", sizeof(imghdr));
 196         fprintf(stderr, "imgHdr.checksum = 0x%08x\n", cksum);
 197         fprintf(stderr, "imgHdr.total_size = 0x%08x\n", bcnt);
 198         fprintf(stderr, "imgHdr.kernel_size = 0x%08x\n", kernel);
 199         fprintf(stderr, "imgHdr.header = %s\n", signature);
 200         fprintf(stderr, "imgHdr.fw_ver = %s\n", version);
 201         fprintf(stderr, "imgHdr.fw_reg = %s\n", region);
 202
 203         return 0;
 204 }