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/**
* This file is part of libsamsung-ipc.
*
* Copyright (C) 2011 Paul Kocialkowski <contact@paulk.fr>
*
* libsamsung-ipc is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* libsamsung-ipc 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.
*
* You should have received a copy of the GNU General Public License
* along with libsamsung-ipc. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <openssl/md5.h>
#include "crespo_nv_data.h"
#include "crespo_ipc.h"
void md5hash2string(char *out, uint8_t *in)
{
int i;
for(i=0 ; i < MD5_DIGEST_LENGTH ; i++)
{
/* After the first iteration, we override \0. */
if(*in < 0x10)
sprintf(out, "0%x", *in);
else
sprintf(out, "%x", *in);
in++;
out+=2;
}
}
void nv_data_generate(void)
{
printf("This feature isn't present yet\n");
// nv_data_backup_create();
}
void nv_data_md5_compute(void *data_p, int size, void *hash)
{
MD5_CTX ctx;
// MD5((unsigned char *)nv_data_p, nv_data_stat.st_size, nv_data_md5_hash);
MD5_Init(&ctx);
MD5_Update(&ctx, data_p, size);
MD5_Update(&ctx, NV_DATA_MD5_SECRET, sizeof(NV_DATA_MD5_SECRET) - 1);
MD5_Final(hash, &ctx);
}
void nv_data_backup_create(void)
{
uint8_t nv_data_md5_hash[MD5_DIGEST_LENGTH];
char *nv_data_md5_hash_string;
struct stat nv_stat;
void *nv_data_p;
uint8_t data;
uint8_t *data_p;
int fd;
int i;
printf("nv_data_backup_create: enter\n");
if(stat("/efs/nv_data.bin", &nv_stat) < 0)
{
printf("nv_data_check: nv_data.bin missing\n");
nv_data_generate();
}
/* Read the content of nv_data.bin. */
nv_data_p=file_read("/efs/nv_data.bin", NV_DATA_SIZE, NV_DATA_SIZE / 10);
fd=open("/efs/.nv_data.bak", O_RDWR | O_CREAT, 0644);
data_p=nv_data_p;
/* Write the content of nv_data.bin in the backup file. */
for(i=0 ; i < NV_DATA_SIZE / 10 ; i++)
{
write(fd, data_p, NV_DATA_SIZE / 10);
data_p+=NV_DATA_SIZE / 10;
}
close(fd);
free(nv_data_p);
/* Alloc the memory for the md5 hash string. */
nv_data_md5_hash_string=malloc(MD5_STRING_SIZE);
memset(nv_data_md5_hash_string, 0, MD5_STRING_SIZE);
/* Read the newly-written .nv_data.bak. */
nv_data_p=file_read("/efs/.nv_data.bak", NV_DATA_SIZE, NV_DATA_SIZE / 10);
/* Compute the MD5 hash for .nv_data.bak.. */
nv_data_md5_compute(nv_data_p, NV_DATA_SIZE, nv_data_md5_hash);
md5hash2string(nv_data_md5_hash_string, nv_data_md5_hash);
printf("nv_data_backup_create: new MD5 hash is %s\n", nv_data_md5_hash_string);
free(nv_data_p);
/* Write the MD5 hash in nv_data.bin.md5. */
fd=open("/efs/.nv_data.bak.md5", O_RDWR | O_CREAT, 0644);
write(fd, nv_data_md5_hash_string, MD5_STRING_SIZE);
close(fd);
free(nv_data_md5_hash_string);
/* Write ASCII 1 on the state file. */
fd=open("/efs/.nv_state", O_RDWR | O_CREAT, 0644);
data='1';
write(fd, &data, sizeof(data));
close(fd);
printf("nv_data_backup_create: exit\n");
}
void nv_data_backup_restore(void)
{
uint8_t nv_data_md5_hash[MD5_DIGEST_LENGTH];
char *nv_data_md5_hash_string;
char *nv_data_md5_hash_read;
struct stat nv_stat;
void *nv_data_p;
uint8_t data;
uint8_t *data_p;
int fd;
int i;
printf("nv_data_backup_restore: enter\n");
if(stat("/efs/.nv_data.bak", &nv_stat) < 0)
{
printf("nv_data_backup_restore: .nv_data.bak missing\n");
nv_data_generate();
nv_data_backup_create();
return;
}
if(nv_stat.st_size != NV_DATA_SIZE)
{
printf("nv_data_backup_restore: wrong .nv_data.bak size\n");
nv_data_generate();
nv_data_backup_create();
return;
}
/* Read the content of the backup file. */
nv_data_p=file_read("/efs/.nv_data.bak", NV_DATA_SIZE, NV_DATA_SIZE / 10);
fd=open("/efs/nv_data.bin", O_RDWR | O_CREAT, 0644);
data_p=nv_data_p;
/* Write the content of the backup file in nv_data.bin. */
for(i=0 ; i < NV_DATA_SIZE / 10 ; i++)
{
write(fd, data_p, NV_DATA_SIZE / 10);
data_p+=NV_DATA_SIZE / 10;
}
close(fd);
free(nv_data_p);
/* Alloc the memory for the md5 hashes strings. */
nv_data_md5_hash_string=malloc(MD5_STRING_SIZE);
nv_data_md5_hash_read=malloc(MD5_STRING_SIZE);
memset(nv_data_md5_hash_read, 0, MD5_STRING_SIZE);
memset(nv_data_md5_hash_string, 0, MD5_STRING_SIZE);
/* Read the newly-written nv_data.bin. */
nv_data_p=file_read("/efs/nv_data.bin", NV_DATA_SIZE, NV_DATA_SIZE / 10);
/* Compute the MD5 hash for nv_data.bin. */
nv_data_md5_compute(nv_data_p, NV_DATA_SIZE, nv_data_md5_hash);
md5hash2string(nv_data_md5_hash_string, nv_data_md5_hash);
free(nv_data_p);
/* Open the backup file MD5 hash. */
fd=open("/efs/.nv_data.bak.md5", O_RDONLY);
/* Read the md5 stored in the file. */
read(fd, nv_data_md5_hash_read, MD5_STRING_SIZE);
/* Add 0x0 to end the string: not sure this is part of the file. */
nv_data_md5_hash_read[MD5_STRING_SIZE - 1]='\0';
printf("nv_data_backup_restore: computed MD5: %s read MD5: %s\n",
nv_data_md5_hash_string, nv_data_md5_hash_read);
/* Make sure both hashes are the same. */
if(strcmp(nv_data_md5_hash_string, nv_data_md5_hash_read) != 0)
{
printf("nv_data_md5_check: MD5 hash mismatch\n");
nv_data_generate();
nv_data_backup_create();
return;
}
close(fd);
/* Write the MD5 hash in nv_data.bin.md5. */
fd=open("/efs/nv_data.bin.md5", O_RDWR | O_CREAT, 0644);
write(fd, nv_data_md5_hash_string, MD5_STRING_SIZE);
close(fd);
free(nv_data_md5_hash_string);
free(nv_data_md5_hash_read);
fd=open("/efs/.nv_state", O_RDWR | O_CREAT, 0644);
data='1';
write(fd, &data, sizeof(data));
close(fd);
printf("nv_data_backup_create: exit\n");
}
void nv_data_check(void)
{
struct stat nv_stat;
int nv_state_fd=-1;
int nv_state=0;
printf("nv_data_check: enter\n");
if(stat("/efs/nv_data.bin", &nv_stat) < 0)
{
printf("nv_data_check: nv_data.bin missing\n");
nv_data_backup_restore();
stat("/efs/nv_data.bin", &nv_stat);
}
if(nv_stat.st_size != NV_DATA_SIZE)
{
printf("nv_data_check: wrong nv_data.bin size\n");
nv_data_backup_restore();
}
if(stat("/efs/.nv_data.bak", &nv_stat) < 0)
{
printf("nv_data_check: .nv_data.bak missing\n");
nv_data_backup_create();
}
if(stat("/efs/nv_data.bin.md5", &nv_stat) < 0)
{
printf("nv_data_check: nv_data.bin.md5 missing\n");
nv_data_backup_create();
}
nv_state_fd=open("/efs/.nv_state", O_RDONLY);
if(nv_state_fd < 0 || fstat(nv_state_fd, &nv_stat) < 0)
{
printf("nv_data_check: .nv_state missing\n");
nv_data_backup_restore();
}
read(nv_state_fd, &nv_state, sizeof(nv_state));
close(nv_state_fd);
if(nv_state != '1')
{
printf("nv_data_check: bad nv_state\n");
nv_data_backup_restore();
}
printf("nv_data_check: everything should be alright\n");
printf("nv_data_check: exit\n");
}
void nv_data_md5_check(void)
{
struct stat nv_stat;
uint8_t nv_data_md5_hash[MD5_DIGEST_LENGTH];
char *nv_data_md5_hash_string;
char *nv_data_md5_hash_read;
void *nv_data_p;
int fd;
uint8_t *data_p;
printf("nv_data_md5_check: enter\n");
nv_data_md5_hash_string=malloc(MD5_STRING_SIZE);
nv_data_md5_hash_read=malloc(MD5_STRING_SIZE);
memset(nv_data_md5_hash_read, 0, MD5_STRING_SIZE);
memset(nv_data_md5_hash_string, 0, MD5_STRING_SIZE);
nv_data_p=file_read("/efs/nv_data.bin", NV_DATA_SIZE, 1024);
data_p=nv_data_p;
nv_data_md5_compute(data_p, NV_DATA_SIZE, nv_data_md5_hash);
md5hash2string(nv_data_md5_hash_string, nv_data_md5_hash);
free(nv_data_p);
fd=open("/efs/nv_data.bin.md5", O_RDONLY);
/* Read the md5 stored in the file. */
read(fd, nv_data_md5_hash_read, MD5_STRING_SIZE);
/* Add 0x0 to end the string: not sure this is part of the file. */
nv_data_md5_hash_read[MD5_STRING_SIZE - 1]='\0';
printf("nv_data_md5_check: computed MD5: %s read MD5: %s\n",
nv_data_md5_hash_string, nv_data_md5_hash_read);
if(strcmp(nv_data_md5_hash_string, nv_data_md5_hash_read) != 0)
{
printf("nv_data_md5_check: MD5 hash mismatch\n");
nv_data_backup_restore();
}
free(nv_data_md5_hash_string);
free(nv_data_md5_hash_read);
printf("nv_data_md5_check: exit\n");
}
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