diff options
Diffstat (limited to 'tools/firmware-utils/src')
| -rw-r--r-- | tools/firmware-utils/src/bcm4908img.c | 340 |
1 files changed, 337 insertions, 3 deletions
diff --git a/tools/firmware-utils/src/bcm4908img.c b/tools/firmware-utils/src/bcm4908img.c index 7e9cba299d..536056d42a 100644 --- a/tools/firmware-utils/src/bcm4908img.c +++ b/tools/firmware-utils/src/bcm4908img.c @@ -6,6 +6,7 @@ #include <byteswap.h> #include <endian.h> #include <errno.h> +#include <stddef.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> @@ -53,6 +54,8 @@ #define WFI_FLAG_HAS_PMC 0x1 #define WFI_FLAG_SUPPORTS_BTRM 0x2 +static int debug; + struct bcm4908img_tail { uint32_t crc32; uint32_t version; @@ -147,10 +150,12 @@ static const uint32_t crc32_tbl[] = { 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d, }; -uint32_t bcm4908img_crc32(uint32_t crc, uint8_t *buf, size_t len) { +uint32_t bcm4908img_crc32(uint32_t crc, const void *buf, size_t len) { + const uint8_t *in = buf; + while (len) { - crc = crc32_tbl[(crc ^ *buf) & 0xff] ^ (crc >> 8); - buf++; + crc = crc32_tbl[(crc ^ *in) & 0xff] ^ (crc >> 8); + in++; len--; } @@ -190,6 +195,27 @@ static void bcm4908img_close(FILE *fp) { fclose(fp); } +static int bcm4908img_calc_crc32(FILE *fp, struct bcm4908img_info *info) { + uint8_t buf[1024]; + size_t length; + size_t bytes; + + fseek(fp, info->vendor_header_size, SEEK_SET); + + info->crc32 = 0xffffffff; + length = info->file_size - info->vendor_header_size - sizeof(struct bcm4908img_tail); + while (length && (bytes = fread(buf, 1, bcm4908img_min(sizeof(buf), length), fp)) > 0) { + info->crc32 = bcm4908img_crc32(info->crc32, buf, bytes); + length -= bytes; + } + if (length) { + fprintf(stderr, "Failed to read last %zd B of data\n", length); + return -EIO; + } + + return 0; +} + /************************************************** * Existing firmware parser **************************************************/ @@ -550,6 +576,306 @@ err_out: } /************************************************** + * bootfs + **************************************************/ + +#define JFFS2_MAGIC_BITMASK 0x1985 + +#define JFFS2_COMPR_NONE 0x00 +#define JFFS2_COMPR_ZERO 0x01 +#define JFFS2_COMPR_RTIME 0x02 +#define JFFS2_COMPR_RUBINMIPS 0x03 +#define JFFS2_COMPR_COPY 0x04 +#define JFFS2_COMPR_DYNRUBIN 0x05 +#define JFFS2_COMPR_ZLIB 0x06 +#define JFFS2_COMPR_LZO 0x07 +/* Compatibility flags. */ +#define JFFS2_COMPAT_MASK 0xc000 /* What do to if an unknown nodetype is found */ +#define JFFS2_NODE_ACCURATE 0x2000 +/* INCOMPAT: Fail to mount the filesystem */ +#define JFFS2_FEATURE_INCOMPAT 0xc000 +/* ROCOMPAT: Mount read-only */ +#define JFFS2_FEATURE_ROCOMPAT 0x8000 +/* RWCOMPAT_COPY: Mount read/write, and copy the node when it's GC'd */ +#define JFFS2_FEATURE_RWCOMPAT_COPY 0x4000 +/* RWCOMPAT_DELETE: Mount read/write, and delete the node when it's GC'd */ +#define JFFS2_FEATURE_RWCOMPAT_DELETE 0x0000 + +#define JFFS2_NODETYPE_DIRENT (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 1) + +typedef struct { + uint32_t v32; +} __attribute__((packed)) jint32_t; + +typedef struct { + uint16_t v16; +} __attribute__((packed)) jint16_t; + +struct jffs2_unknown_node +{ + /* All start like this */ + jint16_t magic; + jint16_t nodetype; + jint32_t totlen; /* So we can skip over nodes we don't grok */ + jint32_t hdr_crc; +}; + +struct jffs2_raw_dirent +{ + jint16_t magic; + jint16_t nodetype; /* == JFFS2_NODETYPE_DIRENT */ + jint32_t totlen; + jint32_t hdr_crc; + jint32_t pino; + jint32_t version; + jint32_t ino; /* == zero for unlink */ + jint32_t mctime; + uint8_t nsize; + uint8_t type; + uint8_t unused[2]; + jint32_t node_crc; + jint32_t name_crc; + uint8_t name[0]; +}; + +#define je16_to_cpu(x) ((x).v16) +#define je32_to_cpu(x) ((x).v32) + +static int bcm4908img_bootfs_ls(FILE *fp, struct bcm4908img_info *info) { + struct jffs2_unknown_node node; + struct jffs2_raw_dirent dirent; + size_t offset; + size_t bytes; + int err = 0; + + for (offset = info->vendor_header_size + info->cferom_size; ; offset += (je32_to_cpu(node.totlen) + 0x03) & ~0x03) { + char name[FILENAME_MAX + 1]; + + if (fseek(fp, offset, SEEK_SET)) { + err = -errno; + fprintf(stderr, "Failed to fseek: %d\n", err); + return err; + } + + bytes = fread(&node, 1, sizeof(node), fp); + if (bytes != sizeof(node)) { + fprintf(stderr, "Failed to read %zu bytes\n", sizeof(node)); + return -EIO; + } + + if (je16_to_cpu(node.magic) != JFFS2_MAGIC_BITMASK) { + break; + } + + if (je16_to_cpu(node.nodetype) != JFFS2_NODETYPE_DIRENT) { + continue; + } + + memcpy(&dirent, &node, sizeof(node)); + bytes += fread((uint8_t *)&dirent + sizeof(node), 1, sizeof(dirent) - sizeof(node), fp); + if (bytes != sizeof(dirent)) { + fprintf(stderr, "Failed to read %zu bytes\n", sizeof(node)); + return -EIO; + } + + if (dirent.nsize + 1 > sizeof(name)) { + /* Keep reading & printing BUT exit with error code */ + fprintf(stderr, "Too long filename\n"); + err = -ENOMEM; + continue; + } + + bytes = fread(name, 1, dirent.nsize, fp); + if (bytes != dirent.nsize) { + fprintf(stderr, "Failed to read filename\n"); + return -EIO; + } + name[bytes] = '\0'; + + printf("%s\n", name); + } + + return err; +} + +static int bcm4908img_bootfs_mv(FILE *fp, struct bcm4908img_info *info, int argc, char **argv) { + struct jffs2_unknown_node node; + struct jffs2_raw_dirent dirent; + const char *oldname; + const char *newname; + size_t offset; + size_t bytes; + int err = -ENOENT; + + if (argc - optind < 2) { + fprintf(stderr, "No enough arguments passed\n"); + return -EINVAL; + } + oldname = argv[optind++]; + newname = argv[optind++]; + + if (strlen(newname) != strlen(oldname)) { + fprintf(stderr, "New filename must have the same length as the old one\n"); + return -EINVAL; + } + + for (offset = info->vendor_header_size + info->cferom_size; ; offset += (je32_to_cpu(node.totlen) + 0x03) & ~0x03) { + char name[FILENAME_MAX]; + uint32_t crc32; + + if (fseek(fp, offset, SEEK_SET)) { + err = -errno; + fprintf(stderr, "Failed to fseek: %d\n", err); + return err; + } + + bytes = fread(&node, 1, sizeof(node), fp); + if (bytes != sizeof(node)) { + fprintf(stderr, "Failed to read %zu bytes\n", sizeof(node)); + return -EIO; + } + + if (je16_to_cpu(node.magic) != JFFS2_MAGIC_BITMASK) { + break; + } + + if (je16_to_cpu(node.nodetype) != JFFS2_NODETYPE_DIRENT) { + continue; + } + + bytes += fread((uint8_t *)&dirent + sizeof(node), 1, sizeof(dirent) - sizeof(node), fp); + if (bytes != sizeof(dirent)) { + fprintf(stderr, "Failed to read %zu bytes\n", sizeof(node)); + return -EIO; + } + + if (dirent.nsize + 1 > sizeof(name)) { + fprintf(stderr, "Too long filename\n"); + err = -ENOMEM; + continue; + } + + bytes = fread(name, 1, dirent.nsize, fp); + if (bytes != dirent.nsize) { + fprintf(stderr, "Failed to read filename\n"); + return -EIO; + } + name[bytes] = '\0'; + + if (debug) + printf("offset:%08zx name_crc:%04x filename:%s\n", offset, je32_to_cpu(dirent.name_crc), name); + + if (strcmp(name, oldname)) { + continue; + } + + if (fseek(fp, offset + offsetof(struct jffs2_raw_dirent, name_crc), SEEK_SET)) { + err = -errno; + fprintf(stderr, "Failed to fseek: %d\n", err); + return err; + } + crc32 = bcm4908img_crc32(0, newname, dirent.nsize); + bytes = fwrite(&crc32, 1, sizeof(crc32), fp); + if (bytes != sizeof(crc32)) { + fprintf(stderr, "Failed to write new CRC32\n"); + return -EIO; + } + + if (fseek(fp, offset + offsetof(struct jffs2_raw_dirent, name), SEEK_SET)) { + err = -errno; + fprintf(stderr, "Failed to fseek: %d\n", err); + return err; + } + bytes = fwrite(newname, 1, dirent.nsize, fp); + if (bytes != dirent.nsize) { + fprintf(stderr, "Failed to write new filename\n"); + return -EIO; + } + + /* Calculate new BCM4908 image checksum */ + + err = bcm4908img_calc_crc32(fp, info); + if (err) { + fprintf(stderr, "Failed to write new filename\n"); + return err; + } + + info->tail.crc32 = cpu_to_le32(info->crc32); + if (fseek(fp, -sizeof(struct bcm4908img_tail), SEEK_END)) { + err = -errno; + fprintf(stderr, "Failed to write new filename\n"); + return err; + } + + if (fwrite(&info->tail, 1, sizeof(struct bcm4908img_tail), fp) != sizeof(struct bcm4908img_tail)) { + fprintf(stderr, "Failed to write updated tail\n"); + return -EIO; + } + + printf("Successfully renamed %s to the %s\n", oldname, newname); + + return 0; + } + + fprintf(stderr, "Failed to find %s\n", oldname); + + return -ENOENT; +} + +static int bcm4908img_bootfs(int argc, char **argv) { + struct bcm4908img_info info; + const char *pathname = NULL; + const char *mode; + const char *cmd; + FILE *fp; + int c; + int err = 0; + + while ((c = getopt(argc, argv, "i:")) != -1) { + switch (c) { + case 'i': + pathname = optarg; + break; + } + } + + if (argc - optind < 1) { + fprintf(stderr, "No bootfs command specified\n"); + err = -EINVAL; + goto out; + } + cmd = argv[optind++]; + + mode = strcmp(cmd, "mv") ? "r" : "r+"; + fp = bcm4908img_open(pathname, mode); + if (!fp) { + fprintf(stderr, "Failed to open BCM4908 image\n"); + err = -EACCES; + goto out; + } + + err = bcm4908img_parse(fp, &info); + if (err) { + fprintf(stderr, "Failed to parse BCM4908 image\n"); + goto err_close; + } + + if (!strcmp(cmd, "ls")) { + err = bcm4908img_bootfs_ls(fp, &info); + } else if (!strcmp(cmd, "mv")) { + err = bcm4908img_bootfs_mv(fp, &info, argc, argv); + } else { + err = -EINVAL; + fprintf(stderr, "Unsupported bootfs command: %s\n", cmd); + } + +err_close: + bcm4908img_close(fp); +out: + return err; +} + +/************************************************** * Start **************************************************/ @@ -570,6 +896,12 @@ static void usage() { printf("\tbcm4908img extract <options>\n"); printf("\t-i <file>\t\t\t\tinput BCM490 image\n"); printf("\t-t <type>\t\t\t\tone of: cferom, bootfs, rootfs, firmware\n"); + printf("\n"); + printf("Access bootfs in a BCM4908 image:\n"); + printf("\tbcm4908img bootfs <options> <command> <arguments>\n"); + printf("\t-i <file>\t\t\t\tinput BCM490 image\n"); + printf("\tls\t\t\t\t\tlist bootfs files\n"); + printf("\tmv <source> <dest>\t\t\trename bootfs file\n"); } int main(int argc, char **argv) { @@ -581,6 +913,8 @@ int main(int argc, char **argv) { return bcm4908img_create(argc, argv); else if (!strcmp(argv[1], "extract")) return bcm4908img_extract(argc, argv); + else if (!strcmp(argv[1], "bootfs")) + return bcm4908img_bootfs(argc, argv); } usage(); |