/*
* Check checksum of file denoted by filename. The expected hash value
* is given in hex_hash which is hex-encoded string.
*
* This function returns 1 if it succeeds or one of the following
* integers:
*
* 0:
* Checksum didn't match.
* -1:
* Could not open file; or could not read data from file.
* -2:
* Hash algorithm not available.
*/
static int check_hash(const char *filename,
const metalink_digest_def *digest_def,
const unsigned char *digest, FILE *error)
{
unsigned char *result;
digest_context *dctx;
int check_ok, flags, fd;
flags = O_RDONLY;
#ifdef O_BINARY
/* O_BINARY is required in order to avoid binary EOF in text mode */
flags |= O_BINARY;
#endif
fd = open(filename, flags);
if(fd == -1) {
fprintf(error, "Metalink: validating (%s) [%s] FAILED (%s)\n", filename,
digest_def->hash_name, strerror(errno));
return -1;
}
dctx = Curl_digest_init(digest_def->dparams);
if(!dctx) {
fprintf(error, "Metalink: validating (%s) [%s] FAILED (%s)\n", filename,
digest_def->hash_name, "failed to initialize hash algorithm");
close(fd);
return -2;
}
result = malloc(digest_def->dparams->digest_resultlen);
while(1) {
unsigned char buf[4096];
ssize_t len = read(fd, buf, sizeof(buf));
if(len == 0) {
break;
}
else if(len == -1) {
fprintf(error, "Metalink: validating (%s) [%s] FAILED (%s)\n", filename,
digest_def->hash_name, strerror(errno));
Curl_digest_final(dctx, result);
close(fd);
return -1;
}
Curl_digest_update(dctx, buf, (unsigned int)len);
}
Curl_digest_final(dctx, result);
check_ok = memcmp(result, digest,
digest_def->dparams->digest_resultlen) == 0;
/* sha*sum style verdict output */
if(check_ok)
fprintf(error, "Metalink: validating (%s) [%s] OK\n", filename,
digest_def->hash_name);
else
fprintf(error, "Metalink: validating (%s) [%s] FAILED (digest mismatch)\n",
filename, digest_def->hash_name);
free(result);
close(fd);
return check_ok;
}
/*
* Check checksum of file denoted by filename. The expected hash value
* is given in hex_hash which is hex-encoded string.
*
* This function returns 1 if it succeeds or one of the following
* integers:
*
* 0:
* Checksum didn't match.
* -1:
* Could not open file; or could not read data from file.
*/
static int check_hash(const char *filename,
const metalink_digest_def *digest_def,
const unsigned char *digest, FILE *error)
{
unsigned char *result;
digest_context *dctx;
int check_ok;
int fd;
fd = open(filename, O_RDONLY);
if(fd == -1) {
fprintf(error, "Metalink: validating (%s) FAILED (%s)\n", filename,
strerror(errno));
return -1;
}
dctx = Curl_digest_init(digest_def->dparams);
result = malloc(digest_def->dparams->digest_resultlen);
while(1) {
unsigned char buf[4096];
ssize_t len = read(fd, buf, sizeof(buf));
if(len == 0) {
break;
}
else if(len == -1) {
fprintf(error, "Metalink: validating (%s) FAILED (%s)\n", filename,
strerror(errno));
Curl_digest_final(dctx, result);
close(fd);
return -1;
}
Curl_digest_update(dctx, buf, (unsigned int)len);
}
Curl_digest_final(dctx, result);
check_ok = memcmp(result, digest,
digest_def->dparams->digest_resultlen) == 0;
/* sha*sum style verdict output */
if(check_ok)
fprintf(error, "Metalink: validating (%s) OK\n", filename);
else
fprintf(error, "Metalink: validating (%s) FAILED (digest mismatch)\n",
filename);
free(result);
close(fd);
return check_ok;
}
