11 #include <netinet/in.h> // htonl
13 // Usage: mkdapimg [-p] [-m <model>] -s <sig> -i <input> -o <output>
15 // e.g.: mkdapimg -s RT3052-AP-DAP1350-3 -i sysupgarde.bin -o factory.bin
17 // If the model string <model> is not given, we will assume that
18 // the leading characters upto the first "-" is the model.
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.
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
28 #define MAX_MODEL_NAME_LEN 20
29 #define MAX_SIG_LEN 30
31 struct img_hdr_struct {
33 char model[MAX_MODEL_NAME_LEN];
34 char sig[MAX_SIG_LEN];
39 uint32_t flash_byte_cnt;
45 perrexit(int code, char *msg)
47 fprintf(stderr, "%s: %s: %s\n", progname, msg, strerror(errno));
54 fprintf(stderr, "usage: %s [-p] [-m model] -s signature -i input -o output\n", progname);
59 main(int ac, char *av[])
61 char model[MAX_MODEL_NAME_LEN+1];
62 char signature[MAX_SIG_LEN+1];
71 progname = basename(av[0]);
72 memset(model, 0, sizeof(model));
73 memset(signature, 0, sizeof(signature));
78 c = getopt(ac, av, "pxm:s:i:o:");
90 if (strlen(optarg) > MAX_MODEL_NAME_LEN) {
91 fprintf(stderr, "%s: model name exceeds %d chars\n",
92 progname, MAX_MODEL_NAME_LEN);
95 strcpy(model, optarg);
98 if (strlen(optarg) > MAX_SIG_LEN) {
99 fprintf(stderr, "%s: signature exceeds %d chars\n",
100 progname, MAX_SIG_LEN);
103 strcpy(signature, optarg);
106 if ((ifile = fopen(optarg, "r")) == NULL)
110 if ((ofile = fopen(optarg, "w")) == NULL)
118 if (signature[0] == 0 || ifile == NULL || ofile == NULL) {
123 char *p = strchr(signature, '-');
125 fprintf(stderr, "%s: model name unknown\n", progname);
128 if (p - signature > MAX_MODEL_NAME_LEN) {
130 fprintf(stderr, "%s: auto model name failed, string %s too long\n", progname, signature);
133 strncpy(model, signature, p - signature);
137 if (fread(&imghdr, sizeof(imghdr), 1, ifile) < 0)
138 perrexit(2, "fread on input");
141 for (bcnt = 0, cksum = 0 ; (c = fgetc(ifile)) != EOF ; bcnt++)
144 if (fseek(ifile, patchmode ? sizeof(imghdr) : 0, SEEK_SET) < 0)
145 perrexit(2, "fseek on input");
147 if (patchmode == 0) {
148 // Fill in the header
149 memset(&imghdr, 0, sizeof(imghdr));
150 imghdr.checksum = htonl(cksum);
151 imghdr.partition = 0 ; // don't care?
152 imghdr.hdr_len = sizeof(imghdr);
153 imghdr.flash_byte_cnt = htonl(bcnt);
155 if (ntohl(imghdr.checksum) != cksum) {
156 fprintf(stderr, "%s: patch mode, checksum mismatch\n",
159 fprintf(stderr, "%s: fixing\n", progname);
160 imghdr.checksum = htonl(cksum);
163 } else if (ntohl(imghdr.flash_byte_cnt) != bcnt) {
164 fprintf(stderr, "%s: patch mode, size mismatch\n",
167 fprintf(stderr, "%s: fixing\n", progname);
168 imghdr.flash_byte_cnt = htonl(bcnt);
174 strncpy(imghdr.model, model, MAX_MODEL_NAME_LEN);
175 strncpy(imghdr.sig, signature, MAX_SIG_LEN);
177 if (fwrite(&imghdr, sizeof(imghdr), 1, ofile) < 0)
178 perrexit(2, "fwrite header on output");
180 while ((c = fgetc(ifile)) != EOF) {
181 if (fputc(c, ofile) == EOF)
182 perrexit(2, "fputc on output");
186 perrexit(2, "fgetc on input");