OpenWrt – Rev 4
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/*
* jffs2 on-disk structure generator for mtd
*
* Copyright (C) 2008 Felix Fietkau <nbd@nbd.name>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License v2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* Based on:
* JFFS2 -- Journalling Flash File System, Version 2.
* Copyright © 2001-2007 Red Hat, Inc.
* Created by David Woodhouse <dwmw2@infradead.org>
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <stdint.h>
#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <unistd.h>
#include <endian.h>
#include "jffs2.h"
#include "crc32.h"
#include "mtd.h"
#define PAD(x) (((x)+3)&~3)
#if BYTE_ORDER == BIG_ENDIAN
# define CLEANMARKER "\x19\x85\x20\x03\x00\x00\x00\x0c\xf0\x60\xdc\x98"
#else
# define CLEANMARKER "\x85\x19\x03\x20\x0c\x00\x00\x00\xb1\xb0\x1e\xe4"
#endif
static int last_ino = 0;
static int last_version = 0;
static char *buf = NULL;
static int ofs = 0;
static int outfd = -1;
static int mtdofs = 0;
static int target_ino = 0;
static void prep_eraseblock(void);
static void pad(int size)
{
if ((ofs % size == 0) && (ofs < erasesize))
return;
if (ofs < erasesize) {
memset(buf + ofs, 0xff, (size - (ofs % size)));
ofs += (size - (ofs % size));
}
ofs = ofs % erasesize;
if (ofs == 0) {
while (mtd_block_is_bad(outfd, mtdofs) && (mtdofs < mtdsize)) {
if (!quiet)
fprintf(stderr, "\nSkipping bad block at 0x%08x ", mtdofs);
mtdofs += erasesize;
/* Move the file pointer along over the bad block. */
lseek(outfd, erasesize, SEEK_CUR);
}
mtd_erase_block(outfd, mtdofs);
write(outfd, buf, erasesize);
mtdofs += erasesize;
}
}
static inline int rbytes(void)
{
return erasesize - (ofs % erasesize);
}
static inline void add_data(char *ptr, int len)
{
if (ofs + len > erasesize) {
pad(erasesize);
prep_eraseblock();
}
memcpy(buf + ofs, ptr, len);
ofs += len;
}
static void prep_eraseblock(void)
{
if (ofs > 0)
return;
add_data(CLEANMARKER, sizeof(CLEANMARKER) - 1);
}
static int add_dirent(const char *name, const char type, int parent)
{
struct jffs2_raw_dirent *de;
if (ofs - erasesize < sizeof(struct jffs2_raw_dirent) + strlen(name))
pad(erasesize);
prep_eraseblock();
last_ino++;
memset(buf + ofs, 0, sizeof(struct jffs2_raw_dirent));
de = (struct jffs2_raw_dirent *) (buf + ofs);
de->magic = JFFS2_MAGIC_BITMASK;
de->nodetype = JFFS2_NODETYPE_DIRENT;
de->type = type;
de->name_crc = crc32(0, name, strlen(name));
de->ino = last_ino++;
de->pino = parent;
de->totlen = sizeof(*de) + strlen(name);
de->hdr_crc = crc32(0, (void *) de, sizeof(struct jffs2_unknown_node) - 4);
de->version = last_version++;
de->mctime = 0;
de->nsize = strlen(name);
de->node_crc = crc32(0, (void *) de, sizeof(*de) - 8);
memcpy(de->name, name, strlen(name));
ofs += sizeof(struct jffs2_raw_dirent) + de->nsize;
pad(4);
return de->ino;
}
static int add_dir(const char *name, int parent)
{
struct jffs2_raw_inode ri;
int inode;
inode = add_dirent(name, IFTODT(S_IFDIR), parent);
if (rbytes() < sizeof(ri))
pad(erasesize);
prep_eraseblock();
memset(&ri, 0, sizeof(ri));
ri.magic = JFFS2_MAGIC_BITMASK;
ri.nodetype = JFFS2_NODETYPE_INODE;
ri.totlen = sizeof(ri);
ri.hdr_crc = crc32(0, &ri, sizeof(struct jffs2_unknown_node) - 4);
ri.ino = inode;
ri.mode = S_IFDIR | 0755;
ri.uid = ri.gid = 0;
ri.atime = ri.ctime = ri.mtime = 0;
ri.isize = ri.csize = ri.dsize = 0;
ri.version = 1;
ri.node_crc = crc32(0, &ri, sizeof(ri) - 8);
ri.data_crc = 0;
add_data((char *) &ri, sizeof(ri));
pad(4);
return inode;
}
static void add_file(const char *name, int parent)
{
int inode, f_offset = 0, fd;
struct jffs2_raw_inode ri;
struct stat st;
char wbuf[4096];
const char *fname;
if (stat(name, &st)) {
fprintf(stderr, "File %s does not exist\n", name);
return;
}
fname = strrchr(name, '/');
if (fname)
fname++;
else
fname = name;
inode = add_dirent(fname, IFTODT(S_IFREG), parent);
memset(&ri, 0, sizeof(ri));
ri.magic = JFFS2_MAGIC_BITMASK;
ri.nodetype = JFFS2_NODETYPE_INODE;
ri.ino = inode;
ri.mode = st.st_mode;
ri.uid = ri.gid = 0;
ri.atime = st.st_atime;
ri.ctime = st.st_ctime;
ri.mtime = st.st_mtime;
ri.isize = st.st_size;
ri.compr = 0;
ri.usercompr = 0;
fd = open(name, 0);
if (fd < 0) {
fprintf(stderr, "File %s does not exist\n", name);
return;
}
for (;;) {
int len = 0;
for (;;) {
len = rbytes() - sizeof(ri);
if (len > 128)
break;
pad(erasesize);
prep_eraseblock();
}
if (len > sizeof(wbuf))
len = sizeof(wbuf);
len = read(fd, wbuf, len);
if (len <= 0)
break;
ri.totlen = sizeof(ri) + len;
ri.hdr_crc = crc32(0, &ri, sizeof(struct jffs2_unknown_node) - 4);
ri.version = ++last_version;
ri.offset = f_offset;
ri.csize = ri.dsize = len;
ri.node_crc = crc32(0, &ri, sizeof(ri) - 8);
ri.data_crc = crc32(0, wbuf, len);
f_offset += len;
add_data((char *) &ri, sizeof(ri));
add_data(wbuf, len);
pad(4);
prep_eraseblock();
}
close(fd);
}
int mtd_replace_jffs2(const char *mtd, int fd, int ofs, const char *filename)
{
outfd = fd;
mtdofs = ofs;
buf = malloc(erasesize);
target_ino = 1;
if (!last_ino)
last_ino = 1;
add_file(filename, target_ino);
pad(erasesize);
/* add eof marker, pad to eraseblock size and write the data */
add_data(JFFS2_EOF, sizeof(JFFS2_EOF) - 1);
pad(erasesize);
free(buf);
return (mtdofs - ofs);
}
void mtd_parse_jffs2data(const char *buf, const char *dir)
{
struct jffs2_unknown_node *node = (struct jffs2_unknown_node *) buf;
unsigned int ofs = 0;
while (ofs < erasesize) {
node = (struct jffs2_unknown_node *) (buf + ofs);
if (node->magic != 0x1985)
break;
ofs += PAD(node->totlen);
if (node->nodetype == JFFS2_NODETYPE_DIRENT) {
struct jffs2_raw_dirent *de = (struct jffs2_raw_dirent *) node;
/* is this the right directory name and is it a subdirectory of / */
if (*dir && (de->pino == 1) && !strncmp((char *) de->name, dir, de->nsize))
target_ino = de->ino;
/* store the last inode and version numbers for adding extra files */
if (last_ino < de->ino)
last_ino = de->ino;
if (last_version < de->version)
last_version = de->version;
}
}
}
int mtd_write_jffs2(const char *mtd, const char *filename, const char *dir)
{
int err = -1, fdeof = 0;
outfd = mtd_check_open(mtd);
if (outfd < 0)
return -1;
if (quiet < 2)
fprintf(stderr, "Appending %s to jffs2 partition %s\n", filename, mtd);
buf = malloc(erasesize);
if (!buf) {
fprintf(stderr, "Out of memory!\n");
goto done;
}
if (!*dir)
target_ino = 1;
/* parse the structure of the jffs2 first
* locate the directory that the file is going to be placed in */
for(;;) {
struct jffs2_unknown_node *node = (struct jffs2_unknown_node *) buf;
if (read(outfd, buf, erasesize) != erasesize) {
fdeof = 1;
break;
}
mtdofs += erasesize;
if (node->magic == 0x8519) {
fprintf(stderr, "Error: wrong endianness filesystem\n");
goto done;
}
/* assume no magic == end of filesystem
* the filesystem will probably end with be32(0xdeadc0de) */
if (node->magic != 0x1985)
break;
mtd_parse_jffs2data(buf, dir);
}
if (fdeof) {
fprintf(stderr, "Error: No room for additional data\n");
goto done;
}
/* jump back one eraseblock */
mtdofs -= erasesize;
lseek(outfd, mtdofs, SEEK_SET);
ofs = 0;
if (!last_ino)
last_ino = 1;
if (!target_ino)
target_ino = add_dir(dir, 1);
add_file(filename, target_ino);
pad(erasesize);
/* add eof marker, pad to eraseblock size and write the data */
add_data(JFFS2_EOF, sizeof(JFFS2_EOF) - 1);
pad(erasesize);
err = 0;
if (trx_fixup) {
trx_fixup(outfd, mtd);
}
done:
close(outfd);
if (buf)
free(buf);
return err;
}