tools/firmware-utils/src/mkdapimg.c

   1 #include <stdio.h>
   2 #include <stdint.h>
   3 #include <stdlib.h>
   4 #include <unistd.h>
   5 #include <libgen.h>
   6 #include <stdarg.h>
   7 #include <getopt.h>
   8 #include <string.h>
   9 #include <errno.h>
  10
  11 #include <netinet/in.h> // htonl
  12
  13 // Usage: mkdapimg [-p] [-m <model>] -s <sig> -i <input> -o <output>
  14 //
  15 // e.g.: mkdapimg -s RT3052-AP-DAP1350-3 -i sysupgarde.bin -o factory.bin
  16 //
  17 // If the model string <model> is not given, we will assume that
  18 // the leading characters upto the first "-" is the model.
  19 //
  20 // The "-p" (patch) option is used to patch the exisiting image with the
  21 // specified model and signature.
  22 // The "-x" (fix) option will recalculate the payload size and checksum
  23 // during the patch mode operation.
  24
  25 // The img_hdr_struct was taken from the D-Link SDK:
  26 // DAP-1350_A1_FW1.11NA_GPL/GPL_Source_Code/Uboot/DAP-1350/httpd/header.h
  27
  28 #define MAX_MODEL_NAME_LEN      20
  29 #define MAX_SIG_LEN             30
  30 #define MAX_REGION_LEN          4
  31 #define MAX_VERSION_LEN         12
  32
  33 struct img_hdr_struct {
  34         uint32_t checksum;
  35         char model[MAX_MODEL_NAME_LEN];
  36         char sig[MAX_SIG_LEN];
  37         uint8_t partition;
  38         uint8_t hdr_len;
  39         uint8_t rsv1;
  40         uint8_t rsv2;
  41         uint32_t flash_byte_cnt;
  42 } imghdr ;
  43
  44 char *progname;
  45
  46 void
  47 perrexit(int code, char *msg)
  48 {
  49         fprintf(stderr, "%s: %s: %s\n", progname, msg, strerror(errno));
  50         exit(code);
  51 }
  52
  53 void
  54 usage()
  55 {
  56         fprintf(stderr, "usage: %s [-p] [-m model] [-r region] [-v version] -s signature -i input -o output\n", progname);
  57         exit(1);
  58 }
  59
  60 int
  61 main(int ac, char *av[])
  62 {
  63         char model[MAX_MODEL_NAME_LEN+1];
  64         char signature[MAX_SIG_LEN+1];
  65         char region[MAX_REGION_LEN+1];
  66         char version[MAX_VERSION_LEN+1];
  67         int patchmode = 0;
  68         int fixmode = 0;
  69         int have_regionversion = 0;
  70
  71         FILE *ifile, *ofile;
  72         int c;
  73         uint32_t cksum;
  74         uint32_t bcnt;
  75
  76         progname = basename(av[0]);
  77         memset(model, 0, sizeof(model));
  78         memset(signature, 0, sizeof(signature));
  79         memset(region, 0, sizeof(region));
  80         memset(version, 0, sizeof(version));
  81
  82         while ( 1 ) {
  83                 int c;
  84
  85                 c = getopt(ac, av, "pxm:r:v:s:i:o:");
  86                 if (c == -1)
  87                         break;
  88
  89                 switch (c) {
  90                 case 'p':
  91                         patchmode = 1;
  92                         break;
  93                 case 'x':
  94                         fixmode = 1;
  95                         break;
  96                 case 'm':
  97                         if (strlen(optarg) > MAX_MODEL_NAME_LEN) {
  98                                 fprintf(stderr, "%s: model name exceeds %d chars\n",
  99                                         progname, MAX_MODEL_NAME_LEN);
 100                                 exit(1);
 101                         }
 102                         strcpy(model, optarg);
 103                         break;
 104                 case 'r':
 105                         if (strlen(optarg) > MAX_REGION_LEN) {
 106                                 fprintf(stderr, "%s: region exceeds %d chars\n",
 107                                         progname, MAX_REGION_LEN);
 108                                 exit(1);
 109                         }
 110                         have_regionversion = 1;
 111                         strcpy(region, optarg);
 112                         break;
 113                 case 'v':
 114                         if (strlen(optarg) > MAX_VERSION_LEN) {
 115                                 fprintf(stderr, "%s: version exceeds %d chars\n",
 116                                         progname, MAX_VERSION_LEN);
 117                                 exit(1);
 118                         }
 119                         have_regionversion = 1;
 120                         strcpy(version, optarg);
 121                         break;
 122                 case 's':
 123                         if (strlen(optarg) > MAX_SIG_LEN) {
 124                                 fprintf(stderr, "%s: signature exceeds %d chars\n",
 125                                         progname, MAX_SIG_LEN);
 126                                 exit(1);
 127                         }
 128                         strcpy(signature, optarg);
 129                         break;
 130                 case 'i':
 131                         if ((ifile = fopen(optarg, "r")) == NULL)
 132                                 perrexit(1, optarg);
 133                         break;
 134                 case 'o':
 135                         if ((ofile = fopen(optarg, "w")) == NULL)
 136                                 perrexit(1, optarg);
 137                         break;
 138                 default:
 139                         usage();
 140                 }
 141         }
 142
 143         if (signature[0] == 0 || ifile == NULL || ofile == NULL) {
 144                 usage();
 145         }
 146
 147         if (model[0] == 0) {
 148                 char *p = strchr(signature, '-');
 149                 if (p == NULL) {
 150                         fprintf(stderr, "%s: model name unknown\n", progname);
 151                         exit(1);
 152                 }
 153                 if (p - signature > MAX_MODEL_NAME_LEN) {
 154                         *p = 0;
 155                         fprintf(stderr, "%s: auto model name failed, string %s too long\n", progname, signature);
 156                         exit(1);
 157                 }
 158                 strncpy(model, signature, p - signature);
 159         }
 160
 161         if (patchmode) {
 162                 if (fread(&imghdr, sizeof(imghdr), 1, ifile) < 0)
 163                         perrexit(2, "fread on input");
 164         }
 165
 166         for (bcnt = 0, cksum = 0 ; (c = fgetc(ifile)) != EOF ; bcnt++)
 167                 cksum += c & 0xff;
 168
 169         if (fseek(ifile, patchmode ? sizeof(imghdr) : 0, SEEK_SET) < 0)
 170                 perrexit(2, "fseek on input");
 171
 172         if (patchmode == 0) {
 173                 // Fill in the header
 174                 memset(&imghdr, 0, sizeof(imghdr));
 175                 imghdr.checksum = htonl(cksum);
 176                 imghdr.partition = 0 ; // don't care?
 177                 imghdr.hdr_len = sizeof(imghdr);
 178                 if (have_regionversion) {
 179                         imghdr.hdr_len += MAX_REGION_LEN;
 180                         imghdr.hdr_len += MAX_VERSION_LEN;
 181                 }
 182                 imghdr.flash_byte_cnt = htonl(bcnt);
 183         } else {
 184                 if (ntohl(imghdr.checksum) != cksum) {
 185                         fprintf(stderr, "%s: patch mode, checksum mismatch\n",
 186                                 progname);
 187                         if (fixmode) {
 188                                 fprintf(stderr, "%s: fixing\n", progname);
 189                                 imghdr.checksum = htonl(cksum);
 190                         } else
 191                                 exit(3);
 192                 } else if (ntohl(imghdr.flash_byte_cnt) != bcnt) {
 193                         fprintf(stderr, "%s: patch mode, size mismatch\n",
 194                                 progname);
 195                         if (fixmode) {
 196                                 fprintf(stderr, "%s: fixing\n", progname);
 197                                 imghdr.flash_byte_cnt = htonl(bcnt);
 198                         } else
 199                                 exit(3);
 200                 }
 201         }
 202
 203         strncpy(imghdr.model, model, MAX_MODEL_NAME_LEN);
 204         strncpy(imghdr.sig, signature, MAX_SIG_LEN);
 205
 206         if (fwrite(&imghdr, sizeof(imghdr), 1, ofile) < 0)
 207                 perrexit(2, "fwrite header on output");
 208         if (have_regionversion) {
 209                 if (fwrite(&region, MAX_REGION_LEN, 1, ofile) < 0)
 210                         perrexit(2, "fwrite header on output");
 211                 if (fwrite(&version, MAX_VERSION_LEN, 1, ofile) < 0)
 212                         perrexit(2, "fwrite header on output");
 213         }
 214
 215         while ((c = fgetc(ifile)) != EOF) {
 216                 if (fputc(c, ofile) == EOF)
 217                         perrexit(2, "fputc on output");
 218         }
 219
 220         if (ferror(ifile))
 221                 perrexit(2, "fgetc on input");
 222
 223
 224         fclose(ofile);
 225         fclose(ifile);
 226 }