OpenWrt – Rev 1
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/* vi: set sw=4 ts=4: */
/*
* Copyright (C) 2008, Alpha Networks, Inc.
* Created by David Hsieh <david_hsieh@alphanetworks.com>
* All right reserved.
*
* (SEA)ttle i(MA)ge is the image which used in project seattle.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdarg.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <arpa/inet.h>
#include "md5.h"
#include "seama.h"
#define PROGNAME "seama"
#define VERSION "0.20"
#define MAX_SEAMA_META_SIZE 1024
#define MAX_META 128
#define MAX_IMAGE 128
extern int optind;
extern char * optarg;
static int o_verbose = 0; /* verbose mode. */
static char * o_dump = NULL; /* Seama file to dump. */
static char * o_seal = NULL; /* Seal the input images when file name exist. */
static char * o_extract = NULL; /* Extract the seama file. */
static char * o_images[MAX_IMAGE];/* The image files to pack or seal */
static int o_isize = 0; /* number of images */
static char * o_meta[MAX_META]; /* meta data array */
static int o_msize = 0; /* size of meta array */
static void verbose(const char * format, ...)
{
va_list marker;
if (o_verbose)
{
va_start(marker, format);
vfprintf(stdout, format, marker);
va_end(marker);
}
}
static void cleanup_exit(int exit_code)
{
verbose("%s: exit with code %d\n", PROGNAME, exit_code);
exit(exit_code);
}
static void show_usage(int exit_code)
{
printf( PROGNAME " version " VERSION "\n"
"usage: " PROGNAME " [OPTIONS]\n"
" -h show this help message.\n"
" -v verbose mode.\n"
" -m {META data} META data.\n"
" -d {file} dump the info of the seama file.\n"
" -i {input file} image file name.\n"
" -s {file} Seal the images to the seama file.\n"
" -x {seama file} Extract the seama file.\n"
"\n"
" SEAMA can pack the input file (with -i) into a seama file.\n"
" ex: seama -i target.file\n"
" SEAMA can also seal multiple seama files into a single seama file.\n"
" ex: seama -s final.file -i taget1.seama -i target2.seama\n"
" To extract the raw image from SEAMA, you need to specify the meta.\n"
" The first image match the specified meta will be extract to\n"
" the output file which was specified with '-x'.\n"
" ex: seama -x output -i seama.image -m file=sealpac\n"
);
cleanup_exit(exit_code);
}
static int parse_args(int argc, char * argv[])
{
int opt;
while ((opt = getopt(argc, argv, "hvd:s:i:m:x:")) > 0)
{
switch (opt)
{
default: show_usage(-1); break;
case 'h': show_usage(0); break;
case 'v': o_verbose++; break;
case 'd': o_dump = optarg; break;
case 's': o_seal = optarg; break;
case 'x': o_extract = optarg; break;
case 'i':
if (o_isize < MAX_IMAGE) o_images[o_isize++] = optarg;
else printf("Exceed the maximum acceptable image files.!\n");
break;
case 'm':
if (o_msize < MAX_META) o_meta[o_msize++] = optarg;
else printf("Exceed the maximum acceptable META data.!\n");
break;
}
}
return 0;
}
/*******************************************************************/
static size_t calculate_digest(FILE * fh, size_t size, uint8_t * digest)
{
MD5_CTX ctx;
size_t bytes_left, bytes_read, i;
uint8_t buf[MAX_SEAMA_META_SIZE];
bytes_left = size ? size : sizeof(buf);
bytes_read = 0;
MD5_Init(&ctx);
while (!feof(fh) && !ferror(fh) && bytes_left > 0)
{
i = bytes_left < sizeof(buf) ? bytes_left : sizeof(buf);
i = fread(buf, sizeof(char), i, fh);
if (i > 0)
{
MD5_Update(&ctx, buf, i);
bytes_read += i;
}
if (size) bytes_left -= i;
}
MD5_Final(digest, &ctx);
return bytes_read;
}
#define READ_BUFF_SIZE 8*1024
static size_t copy_file(FILE * to, FILE * from)
{
size_t i, fsize = 0;
uint8_t buf[READ_BUFF_SIZE];
while (!feof(from) && !ferror(from))
{
i = fread(buf, sizeof(uint8_t), READ_BUFF_SIZE, from);
if (i > 0)
{
fsize += i;
fwrite(buf, sizeof(uint8_t), i, to);
}
}
return fsize;
}
static int verify_seama(const char * fname, int msg)
{
FILE * fh = NULL;
struct stat st;
seamahdr_t shdr;
uint8_t checksum[16];
uint8_t digest[16];
uint8_t buf[MAX_SEAMA_META_SIZE];
size_t msize, isize, i;
int ret = -1;
#define ERRBREAK(fmt, args...) { if (msg) printf(fmt, ##args); break; }
do
{
if (stat(fname, &st) < 0) ERRBREAK("Unable to get the info of '%s'\n",fname);
if ((fh = fopen(fname, "r+"))==NULL) ERRBREAK("Unable to open '%s' for reading!\n",fname);
/* Dump SEAMA header */
if (msg) printf("FILE - %s (%d bytes)\n", fname, (int)st.st_size);
/* SEAMA */
while (!feof(fh) && !ferror(fh))
{
/* read header */
if (fread(&shdr, sizeof(shdr), 1, fh) != 1) break;
/* Check the magic number */
if (shdr.magic != htonl(SEAMA_MAGIC)) ERRBREAK("Invalid SEAMA magic. Probably no more SEAMA!\n");
/* Get the size */
isize = ntohl(shdr.size);
msize = ntohs(shdr.metasize);
/* The checksum exist only if size is greater than zero. */
if (isize > 0)
{
if (fread(checksum, sizeof(checksum), 1, fh) != 1)
ERRBREAK("Error reading checksum !\n");
}
/* Check the META size. */
if (msize > sizeof(buf)) ERRBREAK("META data in SEAMA header is too large!\n");
/* Read META data. */
if (fread(buf, sizeof(char), msize, fh) != msize)
ERRBREAK("Unable to read SEAMA META data!\n");
/* dump header */
if (msg)
{
printf("SEAMA ==========================================\n");
printf(" magic : %08x\n", ntohl(shdr.magic));
printf(" meta size : %zu bytes\n", msize);
for (i=0; i<msize; i+=(strlen((const char *)&buf[i])+1))
printf(" meta data : %s\n", &buf[i]);
printf(" image size : %zu bytes\n", isize);
}
/* verify checksum */
if (isize > 0)
{
if (msg)
{
printf(" checksum : ");
for (i=0; i<16; i++) printf("%02X", checksum[i]);
printf("\n");
}
/* Calculate the checksum */
calculate_digest(fh, isize, digest);
if (msg)
{
printf(" digest : ");
for (i=0; i<16; i++) printf("%02X", digest[i]);
printf("\n");
}
if (memcmp(checksum, digest, 16)!=0) ERRBREAK("!!ERROR!! checksum error !!\n");
ret = 0;
}
}
if (msg) printf("================================================\n");
} while (0);
if (fh) fclose(fh);
return ret;
}
static size_t write_seama_header(FILE * fh, char * meta[], size_t msize, size_t size)
{
seamahdr_t shdr;
size_t i;
uint16_t metasize = 0;
/* Calculate the META size */
for (i=0; i<msize; i++) metasize += (strlen(meta[i]) + 1);
//+++ let meta data end on 4 alignment by siyou. 2010/3/1 03:58pm
metasize = ((metasize+3)/4)*4;
verbose("SEAMA META : %d bytes\n", metasize);
/* Fill up the header, all the data endian should be network byte order. */
shdr.magic = htonl(SEAMA_MAGIC);
shdr.reserved = 0;
shdr.metasize = htons(metasize);
shdr.size = htonl(size);
/* Write the header */
return fwrite(&shdr, sizeof(seamahdr_t), 1, fh);
}
static size_t write_checksum(FILE * fh, uint8_t * checksum)
{
return fwrite(checksum, sizeof(uint8_t), 16, fh);
}
static size_t write_meta_data(FILE * fh, char * meta[], size_t size)
{
size_t i,j;
size_t ret = 0;
for (i=0; i<size; i++)
{
verbose("SEAMA META data : %s\n", meta[i]);
j = fwrite(meta[i], sizeof(char), strlen(meta[i])+1, fh);
if (j != strlen(meta[i])+1) return 0;
ret += j;
}
//+++ let meta data end on 4 alignment by siyou. 2010/3/1 03:58pm
j = ((ret+3)/4)*4;
for ( ; ret < j; ret++)
fwrite("", sizeof(char), 1, fh);
return ret;
}
/*******************************************************************/
static void dump_seama(const char * fname)
{
verify_seama(fname, 1);
}
static void seal_files(const char * file)
{
FILE * fh;
FILE * ifh;
size_t i;
/* Each image should be seama. */
for (i = 0; i < o_isize; i++)
{
if (verify_seama(o_images[i], 0) < 0)
{
printf("'%s' is not a seama file !\n",o_images[i]);
return;
}
}
/* Open file for write */
fh = fopen(file, "w+");
if (fh)
{
/* Write the header. */
write_seama_header(fh, o_meta, o_msize, 0);
write_meta_data(fh, o_meta, o_msize);
/* Write image files */
for (i=0; i<o_isize; i++)
{
ifh = fopen(o_images[i], "r+");
if (ifh)
{
copy_file(fh, ifh);
fclose(ifh);
}
}
fclose(fh);
}
}
static void pack_files(void)
{
FILE * fh;
FILE * ifh;
size_t i, fsize;
char filename[512];
uint8_t digest[16];
for (i=0; i<o_isize; i++)
{
/* Open the input file. */
ifh = fopen(o_images[i], "r+");
if (ifh)
{
fsize = calculate_digest(ifh, 0, digest);
verbose("file size (%s) : %d\n", o_images[i], fsize);
rewind(ifh);
/* Open the output file. */
sprintf(filename, "%s.seama", o_images[i]);
fh = fopen(filename, "w+");
if (fh)
{
write_seama_header(fh, o_meta, o_msize, fsize);
write_checksum(fh, digest);
write_meta_data(fh, o_meta, o_msize);
copy_file(fh, ifh);
fclose(fh);
}
fclose(ifh);
}
else
{
printf("Unable to open image file '%s'\n",o_images[i]);
}
}
}
/**************************************************************************/
static int match_meta(const char * meta, size_t size)
{
size_t i, j;
int match;
for (i = 0; i < o_msize; i++)
{
for (match = 0, j = 0; j < size; j += (strlen(&meta[j])+1))
if (strcmp(&meta[j], o_meta[i])==0) { match++; break; }
if (!match) return 0;
}
return 1;
}
static void extract_file(const char * output)
{
FILE * ifh = NULL;
FILE * ofh = NULL;
size_t msize, isize, i, m;
seamahdr_t shdr;
uint8_t buf[MAX_SEAMA_META_SIZE];
int done = 0;
/* We need meta for searching the target image. */
if (o_msize == 0)
{
printf("SEAMA: need meta for searching image.\n");
return;
}
/* Walk through each input file */
for (i = 0; i < o_isize; i++)
{
/* verify the input file */
if (verify_seama(o_images[i], 0) < 0)
{
printf("SEAMA: '%s' is not a seama file !\n", o_images[i]);
continue;
}
/* open the input file */
ifh = fopen(o_images[i], "r");
if (!ifh) continue;
/* read file */
while (!feof(ifh) && !ferror(ifh))
{
/* read header */
fread(&shdr, sizeof(shdr), 1, ifh);
if (shdr.magic != htonl(SEAMA_MAGIC)) break;
/* Get the size */
isize = ntohl(shdr.size);
msize = ntohs(shdr.metasize);
if (isize == 0)
{
while (msize > 0)
{
m = fread(buf, sizeof(char), (msize < MAX_SEAMA_META_SIZE) ? msize : MAX_SEAMA_META_SIZE, ifh);
if (m <= 0) break;
msize -= m;
}
continue;
}
/* read checksum */
fread(buf, sizeof(char), 16, ifh);
if (msize > 0)
{
/* read META */
fread(buf, sizeof(char), msize, ifh);
if (match_meta((const char *)buf, msize))
{
printf("SEAMA: found image @ '%s', image size: %zu\n", o_images[i], isize);
/* open output file */
ofh = fopen(output, "w");
if (!ofh) printf("SEAMA: unable to open '%s' for writting.\n",output);
else
{
while (isize > 0)
{
m = fread(buf, sizeof(char), (isize < MAX_SEAMA_META_SIZE) ? isize : MAX_SEAMA_META_SIZE, ifh);
if (m <= 0) break;
fwrite(buf, sizeof(char), m, ofh);
isize -= m;
}
fclose(ofh);
}
done++;
break;
}
}
while (isize > 0)
{
m = fread(buf, sizeof(char), (isize < MAX_SEAMA_META_SIZE) ? isize : MAX_SEAMA_META_SIZE, ifh);
if (m <= 0) break;
isize -= m;
}
}
/* close the file. */
fclose(ifh);
if (done) break;
}
return;
}
/*******************************************************************/
#ifdef RGBIN_BOX
int seama_main(int argc, char * argv[], char * env[])
#else
int main(int argc, char * argv[], char * env[])
#endif
{
verbose("SEAMA version " VERSION "\n");
/* parse the arguments */
if (parse_args(argc, argv) < 0) show_usage(9);
/* Do the works */
if (o_dump) dump_seama(o_dump);
else if (o_seal) seal_files(o_seal);
else if (o_extract) extract_file(o_extract);
else pack_files();
cleanup_exit(0);
return 0;
}