From: Rafał Miłecki <[email protected]> On BCM4908 it's required to rename cferam.000 file in firmware image before flashing it.
Signed-off-by: Rafał Miłecki <[email protected]> --- package/utils/bcm63xx-bootfs/Makefile | 34 ++ package/utils/bcm63xx-bootfs/src/Makefile | 7 + .../utils/bcm63xx-bootfs/src/bcm63xx-bootfs.c | 378 ++++++++++++++++++ 3 files changed, 419 insertions(+) create mode 100644 package/utils/bcm63xx-bootfs/Makefile create mode 100644 package/utils/bcm63xx-bootfs/src/Makefile create mode 100644 package/utils/bcm63xx-bootfs/src/bcm63xx-bootfs.c diff --git a/package/utils/bcm63xx-bootfs/Makefile b/package/utils/bcm63xx-bootfs/Makefile new file mode 100644 index 0000000000..f62efeba33 --- /dev/null +++ b/package/utils/bcm63xx-bootfs/Makefile @@ -0,0 +1,34 @@ +# SPDX-License-Identifier: GPL-2.0-only + +include $(TOPDIR)/rules.mk + +PKG_NAME:=bcm63xx-bootfs +PKG_RELEASE:=1 + +include $(INCLUDE_DIR)/package.mk + +define Package/bcm63xx-bootfs + SECTION:=utils + CATEGORY:=Base system + TITLE:=Utility for modifying JFFS2 bootfs images + MAINTAINER:=Rafał Miłecki <[email protected]> + DEPENDS:=@TARGET_bcm4908 +endef + +define Package/bcm63xx-bootfs/description + This package contains an utility that can modify bootfs images. It's useful + when image needs to be adjusted before flashing it. +endef + +define Build/Compile + $(MAKE) -C $(PKG_BUILD_DIR) \ + CC="$(TARGET_CC)" \ + CFLAGS="$(TARGET_CFLAGS) -Wall" +endef + +define Package/bcm63xx-bootfs/install + $(INSTALL_DIR) $(1)/usr/bin + $(INSTALL_BIN) $(PKG_BUILD_DIR)/bcm63xx-bootfs $(1)/usr/bin/ +endef + +$(eval $(call BuildPackage,bcm63xx-bootfs)) diff --git a/package/utils/bcm63xx-bootfs/src/Makefile b/package/utils/bcm63xx-bootfs/src/Makefile new file mode 100644 index 0000000000..e06de9739f --- /dev/null +++ b/package/utils/bcm63xx-bootfs/src/Makefile @@ -0,0 +1,7 @@ +all: bcm63xx-bootfs + +bcm63xx-bootfs: + $(CC) $(CFLAGS) -o $@ bcm63xx-bootfs.c -Wall + +clean: + rm -f bcm63xx-bootfs diff --git a/package/utils/bcm63xx-bootfs/src/bcm63xx-bootfs.c b/package/utils/bcm63xx-bootfs/src/bcm63xx-bootfs.c new file mode 100644 index 0000000000..07bb4d4e7d --- /dev/null +++ b/package/utils/bcm63xx-bootfs/src/bcm63xx-bootfs.c @@ -0,0 +1,378 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2021 Rafał Miłecki <[email protected]> + */ + +#include <endian.h> +#include <errno.h> +#include <stddef.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +static int debug; + +#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) + +/************************************************** + * CRC32 + **************************************************/ + +static const uint32_t crc32_tbl[] = { + 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, +}; + +uint32_t bcm63xx_bootfs_crc32(uint32_t crc, const void *buf, size_t len) { + const uint8_t *in = buf; + + while (len) { + crc = crc32_tbl[(crc ^ *in) & 0xff] ^ (crc >> 8); + in++; + len--; + } + + return crc; +} + +/************************************************** + * Commands + **************************************************/ + +static int bcm63xx_bootfs_ls(int argc, char **argv) { + struct jffs2_unknown_node node; + struct jffs2_raw_dirent dirent; + const char *pathname; + size_t offset; + size_t bytes; + FILE *fp; + int err = 0; + + if (argc < 1 + 1 + 1) { + fprintf(stderr, "No enough arguments passed\n"); + err = -EINVAL; + goto out; + } + pathname = argv[2]; + + fp = fopen(pathname, "r+"); + if (!fp) { + fprintf(stderr, "Failed to open %s\n", pathname); + err = -EIO; + goto out; + } + + for (offset = 0; ; offset += (je32_to_cpu(node.totlen) + 0x03) & ~0x03) { + char name[FILENAME_MAX]; + + fseek(fp, offset, SEEK_SET); + + bytes = fread(&node, 1, sizeof(node), fp); + if (bytes != sizeof(node)) { + fprintf(stderr, "Failed to read %zu bytes\n", sizeof(node)); + err = -EIO; + goto err_close; + } + + 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)); + err = -EIO; + goto err_close; + } + + 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"); + err = -EIO; + goto err_close; + } + name[bytes] = '\0'; + + printf("%s\n", name); + } + +err_close: + fclose(fp); +out: + return err; +} + +static int bcm63xx_bootfs_mv(int argc, char **argv) { + struct jffs2_unknown_node node; + struct jffs2_raw_dirent dirent; + const char *pathname; + const char *oldname; + const char *newname; + size_t offset; + size_t bytes; + FILE *fp; + int err = -ENOENT; + + if (argc < 1 + 1 + 3) { + fprintf(stderr, "No enough arguments passed\n"); + err = -EINVAL; + goto out; + } + pathname = argv[2]; + oldname = argv[3]; + newname = argv[4]; + + if (strlen(newname) != strlen(oldname)) { + fprintf(stderr, "New filename must have the same length as the old one\n"); + err = -EINVAL; + goto out; + } + + fp = fopen(pathname, "r+"); + if (!fp) { + fprintf(stderr, "Failed to open %s\n", pathname); + err = -EIO; + goto out; + } + + for (offset = 0; ; offset += (je32_to_cpu(node.totlen) + 0x03) & ~0x03) { + char name[FILENAME_MAX]; + uint32_t crc32; + + fseek(fp, offset, SEEK_SET); + + bytes = fread(&node, 1, sizeof(node), fp); + if (bytes != sizeof(node)) { + fprintf(stderr, "Failed to read %zu bytes\n", sizeof(node)); + err = -EIO; + goto err_close; + } + + 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)); + err = -EIO; + goto err_close; + } + + 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"); + err = -EIO; + goto err_close; + } + name[bytes] = '\0'; + + if (debug) + printf("offset:%08zx name_crc:%04x filename:%-15s \n", offset, je32_to_cpu(dirent.name_crc), name); + + if (strcmp(name, oldname)) { + continue; + } + + fseek(fp, offset + offsetof(struct jffs2_raw_dirent, name_crc), SEEK_SET); + crc32 = bcm63xx_bootfs_crc32(0, newname, dirent.nsize); + bytes = fwrite(&crc32, 1, sizeof(crc32), fp); + if (bytes != sizeof(crc32)) { + fprintf(stderr, "Failed to write new CRC32\n"); + err = -EIO; + goto err_close; + } + + fseek(fp, offset + offsetof(struct jffs2_raw_dirent, name), SEEK_SET); + bytes = fwrite(newname, 1, dirent.nsize, fp); + if (bytes != dirent.nsize) { + fprintf(stderr, "Failed to write new filename\n"); + err = -EIO; + goto err_close; + } + + printf("Successfully renamed %s to the %s\n", oldname, newname); + + err = 0; + + break; + } + + if (err) + fprintf(stderr, "Failed to find %s\n", oldname); + +err_close: + fclose(fp); +out: + return err; +} + +/************************************************** + * Start + **************************************************/ + +static void bcm63xx_bootfs_usage() { + printf("Usage:\n"); + printf("\n"); + printf("Listing files:\n"); + printf("\tbcm4908img ls <bootfs>\t\t\t\tlist files in the bootfs image\n"); + printf("\n"); + printf("Renaming a file:\n"); + printf("\tbcm4908img mv <bootfs> <oldname> <newname>\trename file in the bootfs image\n"); +} + +int main(int argc, char **argv) { + if (argc > 1) { + if (!strcmp(argv[1], "ls")) + return bcm63xx_bootfs_ls(argc, argv); + else if (!strcmp(argv[1], "mv")) + return bcm63xx_bootfs_mv(argc, argv); + } + + bcm63xx_bootfs_usage(); + return 0; +} -- 2.26.2 _______________________________________________ openwrt-devel mailing list [email protected] https://lists.openwrt.org/mailman/listinfo/openwrt-devel
