RNGs' get_bytes and allocate_bytes return boolean

src/libstrongswan/crypto/rngs/rng.h

@@ -1,4 +1,5 @@
 /*
+ * Copyright (C) 2012 Tobias Brunner
  * Copyright (C) 2008 Martin Willi
  * Hochschule fuer Technik Rapperswil
  *
@@ -53,16 +54,20 @@ struct rng_t {
 	 *
 	 * @param len		number of bytes to get
 	 * @param buffer	pointer where the generated bytes will be written
+	 * @return			TRUE if bytes successfully written
 	 */
-	void (*get_bytes) (rng_t *this, size_t len, u_int8_t *buffer);
+	__attribute__((warn_unused_result))
+	bool (*get_bytes) (rng_t *this, size_t len, u_int8_t *buffer);
 
 	/**
 	 * Generates random bytes and allocate space for them.
 	 *
 	 * @param len		number of bytes to get
 	 * @param chunk		chunk which will hold generated bytes
+	 * @return			TRUE if allocation succeeded
 	 */
-	void (*allocate_bytes) (rng_t *this, size_t len, chunk_t *chunk);
+	__attribute__((warn_unused_result))
+	bool (*allocate_bytes) (rng_t *this, size_t len, chunk_t *chunk);
 
 	/**
 	 * Destroys a rng object.

src/libstrongswan/plugins/gcrypt/gcrypt_rng.c

@@ -35,7 +35,7 @@ struct private_gcrypt_rng_t {
 	rng_quality_t quality;
 };
 
-METHOD(rng_t, get_bytes, void,
+METHOD(rng_t, get_bytes, bool,
 	private_gcrypt_rng_t *this, size_t bytes, u_int8_t *buffer)
 {
 	switch (this->quality)
@@ -50,13 +50,15 @@ METHOD(rng_t, get_bytes, void,
 			gcry_randomize(buffer, bytes, GCRY_VERY_STRONG_RANDOM);
 			break;
 	}
+	return TRUE;
 }
 
-METHOD(rng_t, allocate_bytes, void,
+METHOD(rng_t, allocate_bytes, bool,
 	private_gcrypt_rng_t *this, size_t bytes, chunk_t *chunk)
 {
 	*chunk = chunk_alloc(bytes);
 	get_bytes(this, chunk->len, chunk->ptr);
+	return TRUE;
 }
 
 METHOD(rng_t, destroy, void,

src/libstrongswan/plugins/openssl/openssl_rng.c

@@ -44,10 +44,10 @@ struct private_openssl_rng_t {
 	rng_quality_t quality;
 };
 
-METHOD(rng_t, get_bytes, void,
+METHOD(rng_t, get_bytes, bool,
 	private_openssl_rng_t *this, size_t bytes, u_int8_t *buffer)
 {
-	u_int32_t ret=0;
+	u_int32_t ret;
 
 	if (this->quality == RNG_STRONG)
 	{
@@ -57,18 +57,19 @@ METHOD(rng_t, get_bytes, void,
 	{
 		ret = RAND_pseudo_bytes((char*)buffer, bytes);
 	}
-
+	return ret != 0;
-	if (ret == 0)
-	{
-		DBG1(DBG_LIB, "getting randomness from openssl failed.");
-	}
 }
 
-METHOD(rng_t, allocate_bytes, void,
+METHOD(rng_t, allocate_bytes, bool,
 	private_openssl_rng_t *this, size_t bytes, chunk_t *chunk)
 {
 	*chunk = chunk_alloc(bytes);
-	get_bytes(this, chunk->len, chunk->ptr);
+	if (!get_bytes(this, chunk->len, chunk->ptr))
+	{
+		chunk_free(chunk);
+		return FALSE;
+	}
+	return TRUE;
 }
 
 METHOD(rng_t, destroy, void,

src/libstrongswan/plugins/padlock/padlock_rng.c

@@ -69,7 +69,7 @@ static void rng(char *buf, int len, int quality)
 	}
 }
 
-METHOD(rng_t, allocate_bytes, void,
+METHOD(rng_t, allocate_bytes, bool,
 	private_padlock_rng_t *this, size_t bytes, chunk_t *chunk)
 {
 	chunk->len = bytes;
@@ -77,9 +77,10 @@ METHOD(rng_t, allocate_bytes, void,
 	chunk->ptr = malloc(bytes + 7);
 
 	rng(chunk->ptr, chunk->len, this->quality);
+	return TRUE;
 }
 
-METHOD(rng_t, get_bytes, void,
+METHOD(rng_t, get_bytes, bool,
 	private_padlock_rng_t *this, size_t bytes, u_int8_t *buffer)
 {
 	chunk_t chunk;
@@ -88,6 +89,7 @@ METHOD(rng_t, get_bytes, void,
 	allocate_bytes(this, bytes, &chunk);
 	memcpy(buffer, chunk.ptr, bytes);
 	chunk_clear(&chunk);
+	return TRUE;
 }
 
 METHOD(rng_t, destroy, void,

src/libstrongswan/plugins/pkcs11/pkcs11_rng.c

@@ -43,7 +43,7 @@ struct private_pkcs11_rng_t {
 
 };
 
-METHOD(rng_t, get_bytes, void,
+METHOD(rng_t, get_bytes, bool,
 	private_pkcs11_rng_t *this, size_t bytes, u_int8_t *buffer)
 {
 	CK_RV rv;
@@ -51,15 +51,21 @@ METHOD(rng_t, get_bytes, void,
 	if (rv != CKR_OK)
 	{
 		DBG1(DBG_CFG, "C_GenerateRandom() failed: %N", ck_rv_names, rv);
-		abort();
+		return FALSE;
 	}
+	return TRUE;
 }
 
-METHOD(rng_t, allocate_bytes, void,
+METHOD(rng_t, allocate_bytes, bool,
 	private_pkcs11_rng_t *this, size_t bytes, chunk_t *chunk)
 {
 	*chunk = chunk_alloc(bytes);
-	get_bytes(this, chunk->len, chunk->ptr);
+	if (!get_bytes(this, chunk->len, chunk->ptr))
+	{
+		chunk_clear(chunk);
+		return FALSE;
+	}
+	return TRUE;
 }
 
 METHOD(rng_t, destroy, void,

src/libstrongswan/plugins/random/random_rng.c

@@ -40,7 +40,7 @@ struct private_random_rng_t {
 	int fd;
 };
 
-METHOD(rng_t, get_bytes, void,
+METHOD(rng_t, get_bytes, bool,
 	private_random_rng_t *this, size_t bytes, u_int8_t *buffer)
 {
 	size_t done;
@@ -59,13 +59,15 @@ METHOD(rng_t, get_bytes, void,
 		}
 		done += got;
 	}
+	return TRUE;
 }
 
-METHOD(rng_t, allocate_bytes, void,
+METHOD(rng_t, allocate_bytes, bool,
 	private_random_rng_t *this, size_t bytes, chunk_t *chunk)
 {
 	*chunk = chunk_alloc(bytes);
 	get_bytes(this, chunk->len, chunk->ptr);
+	return TRUE;
 }
 
 METHOD(rng_t, destroy, void,