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move file integrity checks from fuse/filecache to utils/hash

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This commit is contained in:
josch
2014-12-02 07:10:07 +01:00
parent 2f2ce91597
commit 58e8e89771
3 changed files with 98 additions and 98 deletions
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88
utils/hash.c
View File

@@ -21,6 +21,11 @@
#include <openssl/sha.h>
#include <openssl/md5.h>
#include <stddef.h>
#include <inttypes.h>
#include <sys/stat.h>
#include <string.h>
#include "hash.h"
#define bufsize 32768
@@ -166,3 +171,86 @@ int base36_decode_triplet(const char *key)
+ base36_decoding_table[(int)(key)[1]] * 36
+ base36_decoding_table[(int)(key)[2]];
}
int file_check_integrity(const char *path, uint64_t fsize,
const unsigned char *fhash)
{
int retval;
retval = file_check_integrity_size(path, fsize);
if (retval != 0) {
fprintf(stderr, "file_check_integrity_size failed\n");
return -1;
}
retval = file_check_integrity_hash(path, fhash);
if (retval != 0) {
fprintf(stderr, "file_check_integrity_hash failed\n");
return -1;
}
return 0;
}
int file_check_integrity_size(const char *path, uint64_t fsize)
{
struct stat file_info;
int retval;
uint64_t bytes_read;
/* check if the size of the downloaded file matches the expected size */
memset(&file_info, 0, sizeof(file_info));
retval = stat(path, &file_info);
if (retval != 0) {
fprintf(stderr, "stat failed\n");
return -1;
}
bytes_read = file_info.st_size;
if (bytes_read != fsize) {
fprintf(stderr,
"expected %" PRIu64 " bytes but got %" PRIu64 " bytes\n",
fsize, bytes_read);
return -1;
}
return 0;
}
int file_check_integrity_hash(const char *path, const unsigned char *fhash)
{
int retval;
FILE *fh;
unsigned char hash[SHA256_DIGEST_LENGTH];
char *hexhash;
fh = fopen(path, "r");
if (fh == NULL) {
perror("cannot open file");
return -1;
}
retval = calc_sha256(fh, hash);
if (retval != 0) {
fprintf(stderr, "failed to calculate hash\n");
fclose(fh);
return -1;
}
fclose(fh);
if (memcmp(fhash, hash, SHA256_DIGEST_LENGTH) != 0) {
fprintf(stderr, "hashes are not equal\n");
hexhash = binary2hex(fhash, SHA256_DIGEST_LENGTH);
fprintf(stderr, "remote: %s\n", hexhash);
free(hexhash);
hexhash = binary2hex(hash, SHA256_DIGEST_LENGTH);
fprintf(stderr, "downloaded: %s\n", hexhash);
free(hexhash);
return -1;
}
return 0;
}

5
utils/hash.h
View File

@@ -24,5 +24,10 @@ int calc_sha256(FILE * file, unsigned char *hash);
int base36_decode_triplet(const char *key);
void hex2binary(const char *hex, unsigned char *binary);
char *binary2hex(const unsigned char *binary, size_t length);
int file_check_integrity(const char *path, uint64_t fsize,
const unsigned char *fhash);
int file_check_integrity_size(const char *path, uint64_t fsize);
int file_check_integrity_hash(const char *path,
const unsigned char *fhash);
#endif