diff options
Diffstat (limited to 'tools/firmware-utils/src/mkdapimg.c')
| -rw-r--r-- | tools/firmware-utils/src/mkdapimg.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/tools/firmware-utils/src/mkdapimg.c b/tools/firmware-utils/src/mkdapimg.c new file mode 100644 index 000000000..8b0359f74 --- /dev/null +++ b/tools/firmware-utils/src/mkdapimg.c @@ -0,0 +1,191 @@ +#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); +} |