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#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <libgen.h>
#include <stdarg.h>
#include <getopt.h>
#include <string.h>
#include <errno.h>
#include <netinet/in.h> // htonl
// Usage: mkdapimg [-p] [-m <model>] -s <sig> -i <input> -o <output>
//
// e.g.: mkdapimg -s RT3052-AP-DAP1350-3 -i sysupgarde.bin -o factory.bin
//
// If the model string <model> is not given, we will assume that
// the leading characters upto the first "-" is the model.
//
// The "-p" (patch) option is used to patch the exisiting image with the
// specified model and signature.
// The "-x" (fix) option will recalculate the payload size and checksum
// during the patch mode operation.
// The img_hdr_struct was taken from the D-Link SDK:
// DAP-1350_A1_FW1.11NA_GPL/GPL_Source_Code/Uboot/DAP-1350/httpd/header.h
#define MAX_MODEL_NAME_LEN 20
#define MAX_SIG_LEN 30
struct img_hdr_struct {
uint32_t checksum;
char model[MAX_MODEL_NAME_LEN];
char sig[MAX_SIG_LEN];
uint8_t partition;
uint8_t hdr_len;
uint8_t rsv1;
uint8_t rsv2;
uint32_t flash_byte_cnt;
} imghdr ;
char *progname;
void
perrexit(int code, char *msg)
{
fprintf(stderr, "%s: %s: %s\n", progname, msg, strerror(errno));
exit(code);
}
void
usage()
{
fprintf(stderr, "usage: %s [-p] [-m model] -s signature -i input -o output\n", progname);
exit(1);
}
int
main(int ac, char *av[])
{
char model[MAX_MODEL_NAME_LEN+1];
char signature[MAX_SIG_LEN+1];
int patchmode = 0;
int fixmode = 0;
FILE *ifile, *ofile;
int c;
uint32_t cksum;
uint32_t bcnt;
progname = basename(av[0]);
memset(model, 0, sizeof(model));
memset(signature, 0, sizeof(signature));
while ( 1 ) {
int c;
c = getopt(ac, av, "pxm:s:i:o:");
if (c == -1)
break;
switch (c) {
case 'p':
patchmode = 1;
break;
case 'x':
fixmode = 1;
break;
case 'm':
if (strlen(optarg) > MAX_MODEL_NAME_LEN) {
fprintf(stderr, "%s: model name exceeds %d chars\n",
progname, MAX_MODEL_NAME_LEN);
exit(1);
}
strcpy(model, optarg);
break;
case 's':
if (strlen(optarg) > MAX_SIG_LEN) {
fprintf(stderr, "%s: signature exceeds %d chars\n",
progname, MAX_SIG_LEN);
exit(1);
}
strcpy(signature, optarg);
break;
case 'i':
if ((ifile = fopen(optarg, "r")) == NULL)
perrexit(1, optarg);
break;
case 'o':
if ((ofile = fopen(optarg, "w")) == NULL)
perrexit(1, optarg);
break;
default:
usage();
}
}
if (signature[0] == 0 || ifile == NULL || ofile == NULL) {
usage();
}
if (model[0] == 0) {
char *p = strchr(signature, '-');
if (p == NULL) {
fprintf(stderr, "%s: model name unknown\n", progname);
exit(1);
}
if (p - signature > MAX_MODEL_NAME_LEN) {
*p = 0;
fprintf(stderr, "%s: auto model name failed, string %s too long\n", progname, signature);
exit(1);
}
strncpy(model, signature, p - signature);
}
if (patchmode) {
if (fread(&imghdr, sizeof(imghdr), 1, ifile) < 0)
perrexit(2, "fread on input");
}
for (bcnt = 0, cksum = 0 ; (c = fgetc(ifile)) != EOF ; bcnt++)
cksum += c & 0xff;
if (fseek(ifile, patchmode ? sizeof(imghdr) : 0, SEEK_SET) < 0)
perrexit(2, "fseek on input");
if (patchmode == 0) {
// Fill in the header
memset(&imghdr, 0, sizeof(imghdr));
imghdr.checksum = htonl(cksum);
imghdr.partition = 0 ; // don't care?
imghdr.hdr_len = sizeof(imghdr);
imghdr.flash_byte_cnt = htonl(bcnt);
} else {
if (ntohl(imghdr.checksum) != cksum) {
fprintf(stderr, "%s: patch mode, checksum mismatch\n",
progname);
if (fixmode) {
fprintf(stderr, "%s: fixing\n", progname);
imghdr.checksum = htonl(cksum);
} else
exit(3);
} else if (ntohl(imghdr.flash_byte_cnt) != bcnt) {
fprintf(stderr, "%s: patch mode, size mismatch\n",
progname);
if (fixmode) {
fprintf(stderr, "%s: fixing\n", progname);
imghdr.flash_byte_cnt = htonl(bcnt);
} else
exit(3);
}
}
strncpy(imghdr.model, model, MAX_MODEL_NAME_LEN);
strncpy(imghdr.sig, signature, MAX_SIG_LEN);
if (fwrite(&imghdr, sizeof(imghdr), 1, ofile) < 0)
perrexit(2, "fwrite header on output");
while ((c = fgetc(ifile)) != EOF) {
if (fputc(c, ofile) == EOF)
perrexit(2, "fputc on output");
}
if (ferror(ifile))
perrexit(2, "fgetc on input");
fclose(ofile);
fclose(ifile);
}
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