diff options
Diffstat (limited to 'tools/firmware-utils/src/wrt400n.c')
| -rw-r--r-- | tools/firmware-utils/src/wrt400n.c | 334 |
1 files changed, 334 insertions, 0 deletions
diff --git a/tools/firmware-utils/src/wrt400n.c b/tools/firmware-utils/src/wrt400n.c new file mode 100644 index 0000000..a9a4908 --- /dev/null +++ b/tools/firmware-utils/src/wrt400n.c @@ -0,0 +1,334 @@ +/* + * WRT400n - Firmware Generation Creator + * + * Creates a firmware image for the Linksys WRT400n router, + * that can be uploaded via the firmware upload page, + * from a kernel image file and root fs file + * + * Author: Sandeep Mistry + */ +#include <fcntl.h> +#include <stdio.h> +#include <stdint.h> +#include <string.h> +#include <sys/types.h> +#include <sys/stat.h> + +#include "cyg_crc.h" + +// https://dev.openwrt.org/browser/trunk/target/linux/rdc-2.6/files/drivers/mtd/maps/rdc3210.c +static uint32_t crctab[257] = +{ + 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, + 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, + 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, + 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, + 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, + 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, + 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, + 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, + 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, + 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, + 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, + 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, + 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, + 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, + 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, + 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, + 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, + 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, + 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, + 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, + 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, + 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, + 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, + 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, + 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, + 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, + 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, + 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, + 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, + 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, + 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, + 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, + 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, + 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, + 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, + 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, + 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, + 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, + 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, + 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, + 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, + 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, + 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, + 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, + 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, + 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, + 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, + 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, + 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, + 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, + 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, + 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, + 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, + 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, + 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, + 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, + 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, + 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, + 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, + 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, + 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, + 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, + 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, + 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d, + 0 +}; + +static uint32_t crc32(uint8_t* buf, uint32_t len) +{ + register int i; + uint32_t sum; + register uint32_t s0; + s0 = ~0; + for (i = 0; i < len; i++) + { + s0 = (s0 >> 8) ^ crctab[(uint8_t) (s0 & 0xFF) ^ buf[i]]; + } + sum = ~s0; + return sum; +} + +#define HEADERSIZE 60 +#define MAGIC "GMTKRT400N" + +// global variables +uint8_t kernelbuf[0x100000]; // kernel - lzma - uImage +uint8_t rootfsbuf[0x2FFFC4]; // root - squashfs + +uint8_t buf[0x400000]; // buffer for image + + +// Header format: +// +// GPL Tarball: http://downloads.linksysbycisco.com/downloads/WRT400N_1.0.01.19_US.tar,0.gz +// File: WRT400N_1.0.01.19_US/FW_WRT400N_1.0.01.19_US_20081229/GTK/user/include/fw_upgrade.h +// +// +// Struct: +// typedef struct +// { +// UINT32 checksum; /* CRC32 */ +// UINT8 magic[11]; /* The value of GTIMG_MAGIC */ +// UINT32 kernel_length; /* The length of the kernel image */ +// //UINT32 kernel_entry_point; /* Kernel's entry point for RedBoot's information */ +// UINT32 kernel_upgrade_flag; /* Set to 1 if we need to upgrade the kernel parition of the Flash */ +// UINT32 rootfs_length; /* The length of the rootfs image */ +// //UINT32 rootfs_entry_point; /* Not in use */ +// UINT32 rootfs_upgrade_flag; /* Set to 1 if we need to upgrade the rootfs parition of the Flash */ +// +// // Add 3 items by Vic Yu, 2006-05/10 +// UINT32 kernel_checksum; +// UINT32 rootfs_checksum; +// UINT32 fw_totalsize; +// UINT32 reserved[4]; +// }imghdr_t , *pLinuxFWHeader_T; +// +// +// Description +// - checksum: CRC32 of kernel and root fs, back to back +// - magic: GMTKRT400N +// - kernel_length: kernel length in bytes +// - kernel_upgrade_flag: should we upgrade the kernel - set to 1 +// - rootfs_length: root fs length in byte +// - rootfs_upgrade_flag: should we upgrade the root fs - set to 1 +// - kernel_checksum: Gary S. Brown's 32 bit CRC algorithm for kernel, with remaining bits +// set to 0xFF upto 0x100000 bytes (total length) +// - rootfs_checksum: Gary S. Brown's 32 bit CRC algorithm for root fs, with remaining bits +// set to 0xFF upto 0x2FFFC4 bytes (total length) +// - fw_totalsize: total firmware image file length (header length + kernel length + root fs length) +// - reserved[4]: reserved ??? - set to all 0xFF + + + +int main(int argc, char *argv[]) +{ + // file descriptors ... + int kernelfd = -1; + int rootfsfd = -1; + int outfd = -1; + + char* kernelfilename = NULL; + char* rootfsfilename = NULL; + char* outputfilename = NULL; + + // file sizes + uint32_t kernelsize = 0; + uint32_t rootfssize = 0; + uint32_t totalsize = 0; + + // header flags + uint32_t kernelflag = 0; + uint32_t rootfsflag = 0; + + // checksums + uint32_t kernelchecksum = 0; + uint32_t rootfschecksum = 0; + uint32_t crc = 0; + + if(argc != 4) + { + printf("Usage:\n\t%s <kernel file> <rootfs file> <output file>\n", argv[0]); + return 1; + } + + kernelfilename = argv[1]; + rootfsfilename = argv[2]; + outputfilename = argv[3]; + + // Fill the kernel, rootfs, main buffer + memset(kernelbuf, 0xFF, sizeof(kernelbuf)); + memset(rootfsbuf, 0xFF, sizeof(rootfsbuf)); + memset(buf, 0xFF, sizeof(buf)); + + // open the kernel .. + kernelfd = open(kernelfilename, O_RDONLY); + + if(kernelfd == -1) + { + printf("Error: opening '%s'\n", kernelfilename); + goto done; + } + + // read in the kernel ... + kernelsize = read(kernelfd, kernelbuf, sizeof(kernelbuf)); + + if(kernelsize == -1) + { + printf("Error: reading '%s'\n", kernelfilename); + goto done; + } + + // calculate the kernel checksum ... + kernelchecksum = cyg_crc32_accumulate(0, kernelbuf, sizeof(kernelbuf)); + + // print out stats + printf("%s: size %d (0x%x), crc32 = 0x%x\n", kernelfilename, kernelsize, kernelsize, kernelchecksum); + + + // open the root fs .. + rootfsfd = open(rootfsfilename, O_RDONLY); + + if(rootfsfd == -1) + { + printf("Error: opening '%s'\n", rootfsfilename); + goto done; + } + + // read in the root fs .. + rootfssize = read(rootfsfd, rootfsbuf, sizeof(rootfsbuf)); + + if(rootfssize == -1) + { + printf("Error: reading '%s'\n", rootfsfilename); + goto done; + } + + // calculate the root fs checksum ... + rootfschecksum = cyg_crc32_accumulate(0, rootfsbuf, sizeof(rootfsbuf)); + + // print out stats + printf("%s: size %d (0x%x), crc32 = 0x%x\n", rootfsfilename, rootfssize, rootfssize, rootfschecksum); + + + // now for the header ... + + totalsize = HEADERSIZE; + + // copy over kernel + memcpy(buf + totalsize, kernelbuf, kernelsize); + totalsize += kernelsize; + + // copy over root fs + memcpy(buf + totalsize, rootfsbuf, rootfssize); + totalsize += rootfssize; + + // calculate crc + crc = crc32(buf + HEADERSIZE, totalsize - HEADERSIZE); + + // print some stats out + printf("crc = 0x%x, total size = %d (0x%x)\n", crc, totalsize, totalsize); + + // copy crc into header + crc = htonl(crc); + memcpy(buf, &crc, sizeof(crc)); + + // copy over magic + strcpy((char *)buf + 4, MAGIC); + + // copy over kernel size + kernelsize = htonl(kernelsize); + memcpy(buf + 16, &kernelsize, sizeof(kernelsize)); + + // copy over kernal flag + kernelflag = htonl(0x1); + memcpy(buf + 20, &kernelflag, sizeof(kernelflag)); + + // copy over root fs size + rootfssize = htonl(rootfssize); + memcpy(buf + 24, &rootfssize, sizeof(rootfssize)); + + // copy over root fs flag + rootfsflag = htonl(0x1); + memcpy(buf + 28, &rootfsflag, sizeof(rootfsflag)); + + // copy over kernel check sum + kernelchecksum = htonl(kernelchecksum); + memcpy(buf + 32, &kernelchecksum, sizeof(kernelchecksum)); + + // copy over root fs checksum + rootfschecksum = htonl(rootfschecksum); + memcpy(buf + 36, &rootfschecksum, sizeof(rootfschecksum)); + + // copy over total size + totalsize = htonl(totalsize); + memcpy(buf + 40, &totalsize, sizeof(totalsize)); + + // undo the htonl (for write) + totalsize = htonl(totalsize); + + + // write out the file from the buffer + outfd = open(outputfilename, O_CREAT | O_WRONLY | O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); + + if(outfd == -1) + { + printf("ERROR: opening '%s' for write\n", outputfilename); + } + + write(outfd, buf, totalsize); + +done: + // close open fd's + + if(kernelfd != -1) + { + close(kernelfd); + kernelfd = -1; + } + + if(rootfsfd != -1) + { + close(rootfsfd); + rootfsfd = -1; + } + + if(outfd != -1) + { + close(outfd); + outfd = -1; + } + + return 0; +} |