Merge pull request #2938 from yanesca/iotssl-2954-custom-io-unit-test
Mock TCP sockets and callbacks for SSL unit tests
diff --git a/tests/suites/helpers.function b/tests/suites/helpers.function
index 5d0a390..7cc9c09 100644
--- a/tests/suites/helpers.function
+++ b/tests/suites/helpers.function
@@ -230,13 +230,45 @@
#define TEST_VALID_PARAM( TEST ) \
TEST_ASSERT( ( TEST, 1 ) );
-#define TEST_HELPER_ASSERT(a) if( !( a ) ) \
+#define TEST_HELPER_ASSERT(a) if( !( a ) ) \
{ \
- mbedtls_fprintf( stderr, "Assertion Failed at %s:%d - %s\n", \
+ mbedtls_fprintf( stderr, "Assertion Failed at %s:%d - %s\n", \
__FILE__, __LINE__, #a ); \
- mbedtls_exit( 1 ); \
+ mbedtls_exit( 1 ); \
}
+/** Allocate memory dynamically and fail the test case if this fails.
+ *
+ * You must set \p pointer to \c NULL before calling this macro and
+ * put `mbedtls_free( pointer )` in the test's cleanup code.
+ *
+ * If \p length is zero, the resulting \p pointer will be \c NULL.
+ * This is usually what we want in tests since API functions are
+ * supposed to accept null pointers when a buffer size is zero.
+ *
+ * This macro expands to an instruction, not an expression.
+ * It may jump to the \c exit label.
+ *
+ * \param pointer An lvalue where the address of the allocated buffer
+ * will be stored.
+ * This expression may be evaluated multiple times.
+ * \param length Number of elements to allocate.
+ * This expression may be evaluated multiple times.
+ *
+ */
+#define ASSERT_ALLOC( pointer, length ) \
+ do \
+ { \
+ TEST_ASSERT( ( pointer ) == NULL ); \
+ if( ( length ) != 0 ) \
+ { \
+ ( pointer ) = mbedtls_calloc( sizeof( *( pointer ) ), \
+ ( length ) ); \
+ TEST_ASSERT( ( pointer ) != NULL ); \
+ } \
+ } \
+ while( 0 )
+
/*
* 32-bit integer manipulation macros (big endian)
*/
diff --git a/tests/suites/target_test.function b/tests/suites/target_test.function
index d430d9d..b097589 100644
--- a/tests/suites/target_test.function
+++ b/tests/suites/target_test.function
@@ -75,7 +75,7 @@
c[1] = greentea_getc();
c[2] = '\0';
- assert( unhexify( &byte, c ) != 2 );
+ TEST_HELPER_ASSERT( unhexify( &byte, c ) != 2 );
return( byte );
}
@@ -100,7 +100,7 @@
greentea_getc(),
'\0'
};
- assert( unhexify( &value, c ) != 8 );
+ TEST_HELPER_ASSERT( unhexify( &value, c ) != 8 );
return( (uint32_t)value );
}
diff --git a/tests/suites/test_suite_ssl.data b/tests/suites/test_suite_ssl.data
index 45765de..83ef691 100644
--- a/tests/suites/test_suite_ssl.data
+++ b/tests/suites/test_suite_ssl.data
@@ -1,3 +1,69 @@
+Test calback buffer sanity
+test_callback_buffer_sanity:
+
+Callback buffer test: Exercise simple write/read
+test_callback_buffer:50:25:25:25:25:0:0:0:0
+
+Callback buffer test: Filling up the buffer
+test_callback_buffer:50:50:50:50:50:0:0:0:0
+
+Callback buffer test: Filling up the buffer in two steps
+test_callback_buffer:50:20:20:0:0:30:30:50:50
+
+Callback buffer test: Reading out the buffer in two steps
+test_callback_buffer:50:50:50:30:30:0:0:20:20
+
+Callback buffer test: Data wraps in buffer
+test_callback_buffer:50:45:45:10:10:10:10:45:45
+
+Callback buffer test: Data starts at the end
+test_callback_buffer:50:50:50:49:49:10:10:11:11
+
+Callback buffer test: Can write less than requested
+test_callback_buffer:50:75:50:30:30:25:25:45:45
+
+Callback buffer test: Can read less than requested
+test_callback_buffer:50:25:25:30:25:5:5:5:5
+
+Callback buffer test: Writing to full buffer
+test_callback_buffer:50:50:50:0:0:10:0:60:50
+
+Callback buffer test: Reading from empty buffer
+test_callback_buffer:50:0:0:10:0:0:0:0:0
+
+Test mock socket sanity
+ssl_mock_sanity:
+
+Test mock blocking TCP connection
+ssl_mock_tcp:1:0:0
+
+Test mock non-blocking TCP connection: would not block
+ssl_mock_tcp:0:0:0
+
+Test mock non-blocking TCP connection: client would block
+ssl_mock_tcp:0:0xB509:0
+
+Test mock non-blocking TCP connection: server would block
+ssl_mock_tcp:0:0x0FB1:0
+
+Test mock non-blocking TCP connection: both peers would block
+ssl_mock_tcp:0:0x1111:0xEEEE
+
+Test mock blocking TCP connection (interleaving)
+ssl_mock_tcp_interleaving:1:0:0
+
+Test mock non-blocking TCP connection: would not block (interleaving)
+ssl_mock_tcp_interleaving:0:0:0
+
+Test mock non-blocking TCP connection: client would block (interleaving)
+ssl_mock_tcp_interleaving:0:0xB509:0
+
+Test mock non-blocking TCP connection: server would block (interleaving)
+ssl_mock_tcp_interleaving:0:0x0FB1:0
+
+Test mock non-blocking TCP connection: both peers would block (interleaving)
+ssl_mock_tcp_interleaving:0:0x1111:0xEEEE
+
SSL DTLS replay: initial state, seqnum 0
ssl_dtls_replay:"":"000000000000":0
diff --git a/tests/suites/test_suite_ssl.function b/tests/suites/test_suite_ssl.function
index 2fa716b..a57e256 100644
--- a/tests/suites/test_suite_ssl.function
+++ b/tests/suites/test_suite_ssl.function
@@ -2,6 +2,343 @@
#include <mbedtls/ssl.h>
#include <mbedtls/ssl_internal.h>
+
+/*
+ * Buffer structure for custom I/O callbacks.
+ */
+
+typedef struct mbedtls_test_buffer
+{
+ size_t start;
+ size_t content_length;
+ size_t capacity;
+ unsigned char *buffer;
+} mbedtls_test_buffer;
+
+/*
+ * Initialises \p buf. After calling this function it is safe to call
+ * `mbedtls_test_buffer_free()` on \p buf.
+ */
+void mbedtls_test_buffer_init( mbedtls_test_buffer *buf )
+{
+ memset( buf, 0, sizeof( *buf ) );
+}
+
+/*
+ * Sets up \p buf. After calling this function it is safe to call
+ * `mbedtls_test_buffer_put()` and `mbedtls_test_buffer_get()` on \p buf.
+ */
+int mbedtls_test_buffer_setup( mbedtls_test_buffer *buf, size_t capacity )
+{
+ buf->buffer = (unsigned char*) mbedtls_calloc( capacity,
+ sizeof(unsigned char) );
+ if( NULL == buf->buffer )
+ return MBEDTLS_ERR_SSL_ALLOC_FAILED;
+ buf->capacity = capacity;
+
+ return 0;
+}
+
+void mbedtls_test_buffer_free( mbedtls_test_buffer *buf )
+{
+ if( buf->buffer != NULL )
+ mbedtls_free( buf->buffer );
+
+ memset( buf, 0, sizeof( *buf ) );
+}
+
+/*
+ * Puts \p input_len bytes from the \p input buffer into the ring buffer \p buf.
+ *
+ * \p buf must have been initialized and set up by calling
+ * `mbedtls_test_buffer_init()` and `mbedtls_test_buffer_setup()`.
+ *
+ * \retval \p input_len, if the data fits.
+ * \retval 0 <= value < \p input_len, if the data does not fit.
+ * \retval -1, if \p buf is NULL, it hasn't been set up or \p input_len is not
+ * zero and \p input is NULL.
+ */
+int mbedtls_test_buffer_put( mbedtls_test_buffer *buf,
+ const unsigned char* input, size_t input_len )
+{
+ size_t overflow = 0;
+
+ if( ( buf == NULL ) || ( buf->buffer == NULL ) )
+ return -1;
+
+ /* Reduce input_len to a number that fits in the buffer. */
+ if ( ( buf->content_length + input_len ) > buf->capacity )
+ {
+ input_len = buf->capacity - buf->content_length;
+ }
+
+ if( input == NULL )
+ {
+ return ( input_len == 0 ) ? 0 : -1;
+ }
+
+ /* Calculate the number of bytes that need to be placed at lower memory
+ * address */
+ if( buf->start + buf->content_length + input_len
+ > buf->capacity )
+ {
+ overflow = ( buf->start + buf->content_length + input_len )
+ % buf->capacity;
+ }
+
+ memcpy( buf->buffer + buf->start + buf->content_length, input,
+ input_len - overflow );
+ memcpy( buf->buffer, input + input_len - overflow, overflow );
+ buf->content_length += input_len;
+
+ return input_len;
+}
+
+/*
+ * Gets \p output_len bytes from the \p output buffer into the ring buffer
+ * \p buf.
+ *
+ * \p buf must have been initialized and set up by calling
+ * `mbedtls_test_buffer_init()` and `mbedtls_test_buffer_setup()`.
+ *
+ * \retval \p output_len, if the data is available.
+ * \retval 0 <= value < \p output_len, if the data is not available.
+ * \retval -1, if \buf is NULL, it hasn't been set up or \p output_len is not
+ * zero and \p output is NULL
+ */
+int mbedtls_test_buffer_get( mbedtls_test_buffer *buf,
+ unsigned char* output, size_t output_len )
+{
+ size_t overflow = 0;
+
+ if( ( buf == NULL ) || ( buf->buffer == NULL ) )
+ return -1;
+
+ if( output == NULL )
+ {
+ return ( output_len == 0 ) ? 0 : -1;
+ }
+
+ if( buf->content_length < output_len )
+ output_len = buf->content_length;
+
+ /* Calculate the number of bytes that need to be drawn from lower memory
+ * address */
+ if( buf->start + output_len > buf->capacity )
+ {
+ overflow = ( buf->start + output_len ) % buf->capacity;
+ }
+
+ memcpy( output, buf->buffer + buf->start, output_len - overflow );
+ memcpy( output + output_len - overflow, buf->buffer, overflow );
+ buf->content_length -= output_len;
+ buf->start = ( buf->start + output_len ) % buf->capacity;
+
+ return output_len;
+}
+
+/*
+ * Context for the I/O callbacks simulating network connection.
+ */
+
+#define MBEDTLS_MOCK_SOCKET_CONNECTED 1
+
+typedef struct mbedtls_mock_socket
+{
+ int status;
+ uint32_t blocking_pattern;
+ mbedtls_test_buffer *input;
+ mbedtls_test_buffer *output;
+ struct mbedtls_mock_socket *peer;
+} mbedtls_mock_socket;
+
+/*
+ * Setup and teardown functions for mock sockets.
+ */
+void mbedtls_mock_socket_init( mbedtls_mock_socket *socket )
+{
+ memset( socket, 0, sizeof( *socket ) );
+}
+
+/*
+ * Closes the socket \p socket.
+ *
+ * \p socket must have been previously initialized by calling
+ * mbedtls_mock_socket_init().
+ *
+ * This function frees all allocated resources and both sockets are aware of the
+ * new connection state.
+ *
+ * That is, this function does not simulate half-open TCP connections and the
+ * phenomenon that when closing a UDP connection the peer is not aware of the
+ * connection having been closed.
+ */
+void mbedtls_mock_socket_close( mbedtls_mock_socket* socket )
+{
+ if( socket == NULL )
+ return;
+
+ if( socket->input != NULL )
+ {
+ mbedtls_test_buffer_free( socket->input );
+ mbedtls_free( socket->input );
+ }
+
+ if( socket->output != NULL )
+ {
+ mbedtls_test_buffer_free( socket->output );
+ mbedtls_free( socket->output );
+ }
+
+ if( socket->peer != NULL )
+ memset( socket->peer, 0, sizeof( *socket->peer ) );
+
+ memset( socket, 0, sizeof( *socket ) );
+}
+
+/*
+ * Establishes a connection between \p peer1 and \p peer2.
+ *
+ * \p peer1 and \p peer2 must have been previously initialized by calling
+ * mbedtls_mock_socket_init().
+ *
+ * The capacites of the internal buffers are set to \p bufsize. Setting this to
+ * the correct value allows for simulation of MTU, sanity testing the mock
+ * implementation and mocking TCP connections with lower memory cost.
+ */
+int mbedtls_mock_socket_connect( mbedtls_mock_socket* peer1,
+ mbedtls_mock_socket* peer2,
+ size_t bufsize )
+{
+ int ret = -1;
+
+ peer1->input = peer2->output =
+ (mbedtls_test_buffer*) mbedtls_calloc( 1, sizeof(mbedtls_test_buffer) );
+ if( peer1->input == NULL )
+ {
+ ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
+ goto exit;
+ }
+ mbedtls_test_buffer_init( peer1->input );
+ if( 0 != ( ret = mbedtls_test_buffer_setup( peer1->input, bufsize ) ) )
+ {
+ goto exit;
+ }
+
+ peer1->output = peer2->input =
+ (mbedtls_test_buffer*) mbedtls_calloc( 1, sizeof(mbedtls_test_buffer) );
+ if( peer1->output == NULL )
+ {
+ ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
+ goto exit;
+ }
+ mbedtls_test_buffer_init( peer1->output );
+ if( 0 != ( ret = mbedtls_test_buffer_setup( peer1->output, bufsize ) ) )
+ {
+ goto exit;
+ }
+
+ peer1->peer = peer2;
+ peer2->peer = peer1;
+
+ peer1->status = peer2->status = MBEDTLS_MOCK_SOCKET_CONNECTED;
+ ret = 0;
+
+exit:
+
+ if( ret != 0 )
+ {
+ mbedtls_mock_socket_close( peer1 );
+ mbedtls_mock_socket_close( peer2 );
+ }
+
+ return ret;
+}
+
+/*
+ * Set the blocking pattern for the socket.
+ *
+ * For every bit of \p blocking_pattern set to one the socket will simulate a
+ * "would block" event. The bits are processed starting with the least
+ * significant bit and every call to a non-blocking I/O function consumes one.
+ *
+ * The behaviour of blocking I/O functions remains unchanged.
+ */
+int mbedtls_mock_socket_set_block( mbedtls_mock_socket* socket,
+ uint32_t blocking_pattern )
+{
+ if( socket == NULL )
+ return -1;
+
+ socket->blocking_pattern = blocking_pattern;
+
+ return 0;
+}
+
+/*
+ * Callbacks for simulating blocking I/O over connection-oriented transport.
+ */
+
+int mbedtls_mock_tcp_send_b( void *ctx, const unsigned char *buf, size_t len )
+{
+ mbedtls_mock_socket *socket = (mbedtls_mock_socket*) ctx;
+
+ if( socket == NULL || socket->status != MBEDTLS_MOCK_SOCKET_CONNECTED )
+ return -1;
+
+ return mbedtls_test_buffer_put( socket->output, buf, len );
+}
+
+int mbedtls_mock_tcp_recv_b( void *ctx, unsigned char *buf, size_t len )
+{
+ mbedtls_mock_socket *socket = (mbedtls_mock_socket*) ctx;
+
+ if( socket == NULL || socket->status != MBEDTLS_MOCK_SOCKET_CONNECTED )
+ return -1;
+
+ return mbedtls_test_buffer_get( socket->input, buf, len );
+}
+
+/*
+ * Callbacks for simulating non-blocking I/O over connection-oriented transport.
+ */
+
+int mbedtls_mock_tcp_send_nb( void *ctx, const unsigned char *buf, size_t len )
+{
+ mbedtls_mock_socket *socket = (mbedtls_mock_socket*) ctx;
+
+ if( socket == NULL || socket->status != MBEDTLS_MOCK_SOCKET_CONNECTED )
+ return -1;
+
+ if( socket->blocking_pattern & 1 )
+ {
+ socket->blocking_pattern >>= 1;
+ return MBEDTLS_ERR_SSL_WANT_WRITE;
+ }
+
+ socket->blocking_pattern >>= 1;
+
+ return mbedtls_test_buffer_put( socket->output, buf, len );
+}
+
+int mbedtls_mock_tcp_recv_nb( void *ctx, unsigned char *buf, size_t len )
+{
+ mbedtls_mock_socket *socket = (mbedtls_mock_socket*) ctx;
+
+ if( socket == NULL || socket->status != MBEDTLS_MOCK_SOCKET_CONNECTED )
+ return -1;
+
+ if( socket->blocking_pattern & 1 )
+ {
+ socket->blocking_pattern >>= 1;
+ return MBEDTLS_ERR_SSL_WANT_READ;
+ }
+
+ socket->blocking_pattern >>= 1;
+
+ return mbedtls_test_buffer_get( socket->input, buf, len );
+}
+
/*
* Helper function setting up inverse record transformations
* using given cipher, hash, EtM mode, authentication tag length,
@@ -361,6 +698,440 @@
* END_DEPENDENCIES
*/
+/* BEGIN_CASE */
+void test_callback_buffer_sanity()
+{
+ enum { MSGLEN = 10 };
+ mbedtls_test_buffer buf;
+ unsigned char input[MSGLEN];
+ unsigned char output[MSGLEN];
+
+ memset( input, 0, sizeof(input) );
+
+ /* Make sure calling put and get on NULL buffer results in error. */
+ TEST_ASSERT( mbedtls_test_buffer_put( NULL, input, sizeof( input ) )
+ == -1 );
+ TEST_ASSERT( mbedtls_test_buffer_get( NULL, output, sizeof( output ) )
+ == -1 );
+ TEST_ASSERT( mbedtls_test_buffer_put( NULL, NULL, sizeof( input ) ) == -1 );
+ TEST_ASSERT( mbedtls_test_buffer_get( NULL, NULL, sizeof( output ) )
+ == -1 );
+ TEST_ASSERT( mbedtls_test_buffer_put( NULL, NULL, 0 ) == -1 );
+ TEST_ASSERT( mbedtls_test_buffer_get( NULL, NULL, 0 ) == -1 );
+
+ /* Make sure calling put and get on a buffer that hasn't been set up results
+ * in eror. */
+ mbedtls_test_buffer_init( &buf );
+
+ TEST_ASSERT( mbedtls_test_buffer_put( &buf, input, sizeof( input ) ) == -1 );
+ TEST_ASSERT( mbedtls_test_buffer_get( &buf, output, sizeof( output ) )
+ == -1 );
+ TEST_ASSERT( mbedtls_test_buffer_put( &buf, NULL, sizeof( input ) ) == -1 );
+ TEST_ASSERT( mbedtls_test_buffer_get( &buf, NULL, sizeof( output ) )
+ == -1 );
+ TEST_ASSERT( mbedtls_test_buffer_put( &buf, NULL, 0 ) == -1 );
+ TEST_ASSERT( mbedtls_test_buffer_get( &buf, NULL, 0 ) == -1 );
+
+ /* Make sure calling put end get on NULL input and output only results in
+ * error if the length is not zero. */
+
+ TEST_ASSERT( mbedtls_test_buffer_setup( &buf, sizeof( input ) ) == 0 );
+
+ TEST_ASSERT( mbedtls_test_buffer_put( &buf, NULL, sizeof( input ) ) == -1 );
+ TEST_ASSERT( mbedtls_test_buffer_get( &buf, NULL, sizeof( output ) )
+ == -1 );
+ TEST_ASSERT( mbedtls_test_buffer_put( &buf, NULL, 0 ) == 0 );
+ TEST_ASSERT( mbedtls_test_buffer_get( &buf, NULL, 0 ) == 0 );
+
+exit:
+
+ mbedtls_test_buffer_free( &buf );
+}
+/* END_CASE */
+
+/*
+ * Test if the implementation of `mbedtls_test_buffer` related functions is
+ * correct and works as expected.
+ *
+ * That is
+ * - If we try to put in \p put1 bytes then we can put in \p put1_ret bytes.
+ * - Afterwards if we try to get \p get1 bytes then we can get \get1_ret bytes.
+ * - Next, if we try to put in \p put1 bytes then we can put in \p put1_ret
+ * bytes.
+ * - Afterwards if we try to get \p get1 bytes then we can get \get1_ret bytes.
+ * - All of the bytes we got match the bytes we put in in a FIFO manner.
+ */
+
+/* BEGIN_CASE */
+void test_callback_buffer( int size, int put1, int put1_ret,
+ int get1, int get1_ret, int put2, int put2_ret,
+ int get2, int get2_ret )
+{
+ enum { ROUNDS = 2 };
+ size_t put[ROUNDS];
+ int put_ret[ROUNDS];
+ size_t get[ROUNDS];
+ int get_ret[ROUNDS];
+ mbedtls_test_buffer buf;
+ unsigned char* input = NULL;
+ size_t input_len;
+ unsigned char* output = NULL;
+ size_t output_len;
+ size_t i, j, written, read;
+
+ mbedtls_test_buffer_init( &buf );
+ TEST_ASSERT( mbedtls_test_buffer_setup( &buf, size ) == 0 );
+
+ /* Check the sanity of input parameters and initialise local variables. That
+ * is, ensure that the amount of data is not negative and that we are not
+ * expecting more to put or get than we actually asked for. */
+ TEST_ASSERT( put1 >= 0 );
+ put[0] = put1;
+ put_ret[0] = put1_ret;
+ TEST_ASSERT( put1_ret <= put1 );
+ TEST_ASSERT( put2 >= 0 );
+ put[1] = put2;
+ put_ret[1] = put2_ret;
+ TEST_ASSERT( put2_ret <= put2 );
+
+ TEST_ASSERT( get1 >= 0 );
+ get[0] = get1;
+ get_ret[0] = get1_ret;
+ TEST_ASSERT( get1_ret <= get1 );
+ TEST_ASSERT( get2 >= 0 );
+ get[1] = get2;
+ get_ret[1] = get2_ret;
+ TEST_ASSERT( get2_ret <= get2 );
+
+ input_len = 0;
+ /* Calculate actual input and output lengths */
+ for( j = 0; j < ROUNDS; j++ )
+ {
+ if( put_ret[j] > 0 )
+ {
+ input_len += put_ret[j];
+ }
+ }
+ /* In order to always have a valid pointer we always allocate at least 1
+ * byte. */
+ if( input_len == 0 )
+ input_len = 1;
+ ASSERT_ALLOC( input, input_len );
+
+ output_len = 0;
+ for( j = 0; j < ROUNDS; j++ )
+ {
+ if( get_ret[j] > 0 )
+ {
+ output_len += get_ret[j];
+ }
+ }
+ TEST_ASSERT( output_len <= input_len );
+ /* In order to always have a valid pointer we always allocate at least 1
+ * byte. */
+ if( output_len == 0 )
+ output_len = 1;
+ ASSERT_ALLOC( output, output_len );
+
+ /* Fill up the buffer with structured data so that unwanted changes
+ * can be detected */
+ for( i = 0; i < input_len; i++ )
+ {
+ input[i] = i & 0xFF;
+ }
+
+ written = read = 0;
+ for( j = 0; j < ROUNDS; j++ )
+ {
+ TEST_ASSERT( put_ret[j] == mbedtls_test_buffer_put( &buf,
+ input + written, put[j] ) );
+ written += put_ret[j];
+ TEST_ASSERT( get_ret[j] == mbedtls_test_buffer_get( &buf,
+ output + read, get[j] ) );
+ read += get_ret[j];
+ TEST_ASSERT( read <= written );
+ if( get_ret[j] > 0 )
+ {
+ TEST_ASSERT( memcmp( output + read - get_ret[j],
+ input + read - get_ret[j], get_ret[j] )
+ == 0 );
+ }
+ }
+
+exit:
+
+ mbedtls_free( input );
+ mbedtls_free( output );
+ mbedtls_test_buffer_free( &buf );
+}
+/* END_CASE */
+
+/*
+ * Test if the implementation of `mbedtls_mock_socket` related I/O functions is
+ * correct and works as expected on unconnected sockets.
+ */
+
+/* BEGIN_CASE */
+void ssl_mock_sanity( )
+{
+ enum { MSGLEN = 105 };
+ unsigned char message[MSGLEN];
+ unsigned char received[MSGLEN];
+ mbedtls_mock_socket socket;
+
+ mbedtls_mock_socket_init( &socket );
+ TEST_ASSERT( mbedtls_mock_tcp_send_b( &socket, message, MSGLEN ) < 0 );
+ mbedtls_mock_socket_close( &socket );
+ mbedtls_mock_socket_init( &socket );
+ TEST_ASSERT( mbedtls_mock_tcp_recv_b( &socket, received, MSGLEN ) < 0 );
+ mbedtls_mock_socket_close( &socket );
+
+ mbedtls_mock_socket_init( &socket );
+ TEST_ASSERT( mbedtls_mock_tcp_send_nb( &socket, message, MSGLEN ) < 0 );
+ mbedtls_mock_socket_close( &socket );
+ mbedtls_mock_socket_init( &socket );
+ TEST_ASSERT( mbedtls_mock_tcp_recv_nb( &socket, received, MSGLEN ) < 0 );
+ mbedtls_mock_socket_close( &socket );
+
+exit:
+
+ mbedtls_mock_socket_close( &socket );
+}
+/* END_CASE */
+
+/*
+ * Test if the implementation of `mbedtls_mock_socket` related functions can
+ * send a single message from the client to the server.
+ */
+
+/* BEGIN_CASE */
+void ssl_mock_tcp( int blocking, int client_pattern, int server_pattern )
+{
+ enum { MSGLEN = 105 };
+ unsigned char message[MSGLEN];
+ unsigned char received[MSGLEN];
+ mbedtls_mock_socket client;
+ mbedtls_mock_socket server;
+ size_t written, read;
+ int send_ret, recv_ret;
+ mbedtls_ssl_send_t *send;
+ mbedtls_ssl_recv_t *recv;
+ uint32_t client_block = client_pattern;
+ uint32_t server_block = server_pattern;
+ unsigned i;
+
+ if( blocking == 0 )
+ {
+ send = mbedtls_mock_tcp_send_nb;
+ recv = mbedtls_mock_tcp_recv_nb;
+ }
+ else
+ {
+ send = mbedtls_mock_tcp_send_b;
+ recv = mbedtls_mock_tcp_recv_b;
+ }
+
+ mbedtls_mock_socket_init( &client );
+ mbedtls_mock_socket_init( &server );
+
+ /* Fill up the buffer with structured data so that unwanted changes
+ * can be detected */
+ for( i = 0; i < MSGLEN; i++ )
+ {
+ message[i] = i & 0xFF;
+ }
+
+ /* Make sure that sending a message takes a few iterations. */
+ TEST_ASSERT( 0 == mbedtls_mock_socket_connect( &client, &server,
+ MSGLEN / 5 ) );
+ TEST_ASSERT( 0 == mbedtls_mock_socket_set_block( &client, client_block ) );
+ TEST_ASSERT( 0 == mbedtls_mock_socket_set_block( &server, server_block ) );
+
+ /* Send the message to the server */
+ send_ret = recv_ret = 1;
+ written = read = 0;
+ while( send_ret != 0 || recv_ret != 0 )
+ {
+ send_ret = send( &client, message + written, MSGLEN - written );
+
+ if( ( blocking == 0 ) && ( client_block & 1 ) )
+ {
+ TEST_ASSERT( send_ret == MBEDTLS_ERR_SSL_WANT_WRITE );
+ }
+ else
+ {
+ TEST_ASSERT( send_ret >= 0 );
+ written += send_ret;
+ }
+ client_block >>= 1;
+
+ recv_ret = recv( &server, received + read, MSGLEN - read );
+ if( ( blocking == 0 ) && ( server_block & 1 ) )
+ {
+ TEST_ASSERT( recv_ret == MBEDTLS_ERR_SSL_WANT_READ );
+ }
+ else
+ {
+ TEST_ASSERT( recv_ret >= 0 );
+ read += recv_ret;
+ }
+ server_block >>= 1;
+ }
+ TEST_ASSERT( memcmp( message, received, MSGLEN ) == 0 );
+
+exit:
+
+ mbedtls_mock_socket_close( &client );
+ mbedtls_mock_socket_close( &server );
+}
+/* END_CASE */
+
+/*
+ * Test if the implementation of `mbedtls_mock_socket` related functions can
+ * send messages in both direction at the same time (with the I/O calls
+ * interleaving).
+ */
+
+/* BEGIN_CASE */
+void ssl_mock_tcp_interleaving( int blocking,
+ int client_pattern, int server_pattern )
+{
+ enum { ROUNDS = 2 };
+ enum { MSGLEN = 105 };
+ unsigned char message[ROUNDS][MSGLEN];
+ unsigned char received[ROUNDS][MSGLEN];
+ mbedtls_mock_socket client;
+ mbedtls_mock_socket server;
+ size_t written[ROUNDS];
+ size_t read[ROUNDS];
+ int send_ret[ROUNDS];
+ int recv_ret[ROUNDS];
+ unsigned i, j, progress;
+ mbedtls_ssl_send_t *send;
+ mbedtls_ssl_recv_t *recv;
+ uint32_t client_block = client_pattern;
+ uint32_t server_block = server_pattern;
+
+ if( blocking == 0 )
+ {
+ send = mbedtls_mock_tcp_send_nb;
+ recv = mbedtls_mock_tcp_recv_nb;
+ }
+ else
+ {
+ send = mbedtls_mock_tcp_send_b;
+ recv = mbedtls_mock_tcp_recv_b;
+ }
+
+ mbedtls_mock_socket_init( &client );
+ mbedtls_mock_socket_init( &server );
+
+ /* Fill up the buffers with structured data so that unwanted changes
+ * can be detected */
+ for( i = 0; i < ROUNDS; i++ )
+ {
+ for( j = 0; j < MSGLEN; j++ )
+ {
+ message[i][j] = ( i * MSGLEN + j ) & 0xFF;
+ }
+ }
+
+ /* Make sure that sending a message takes a few iterations. */
+ TEST_ASSERT( 0 == mbedtls_mock_socket_connect( &client, &server,
+ MSGLEN / 5 ) );
+ TEST_ASSERT( 0 == mbedtls_mock_socket_set_block( &client, client_block ) );
+ TEST_ASSERT( 0 == mbedtls_mock_socket_set_block( &server, server_block ) );
+
+ /* Send the message from both sides, interleaving. */
+ progress = 1;
+ for( i = 0; i < ROUNDS; i++ )
+ {
+ written[i] = 0;
+ read[i] = 0;
+ }
+ /* This loop does not stop as long as there was a successful write or read
+ * of at least one byte on either side. */
+ while( progress != 0 )
+ {
+ send_ret[0] = send( &client, message[0] + written[0],
+ MSGLEN - written[0] );
+ if( ( blocking == 0 ) && ( client_block & 1 ) )
+ {
+ TEST_ASSERT( send_ret[0] == MBEDTLS_ERR_SSL_WANT_WRITE );
+ }
+ else
+ {
+ TEST_ASSERT( send_ret[0] >= 0 );
+ written[0] += send_ret[0];
+ }
+ client_block >>= 1;
+
+ send_ret[1] = send( &server, message[1] + written[1],
+ MSGLEN - written[1] );
+ if( ( blocking == 0 ) && ( server_block & 1 ) )
+ {
+ TEST_ASSERT( send_ret[1] == MBEDTLS_ERR_SSL_WANT_WRITE );
+ }
+ else
+ {
+ TEST_ASSERT( send_ret[1] >= 0 );
+ written[1] += send_ret[1];
+ }
+ server_block >>= 1;
+
+ recv_ret[0] = recv( &server, received[0] + read[0],
+ MSGLEN - read[0] );
+ if( ( blocking == 0 ) && ( server_block & 1 ) )
+ {
+ TEST_ASSERT( recv_ret[0] == MBEDTLS_ERR_SSL_WANT_READ );
+ }
+ else
+ {
+ TEST_ASSERT( recv_ret[0] >= 0 );
+ read[0] += recv_ret[0];
+ }
+ server_block >>= 1;
+
+ recv_ret[1] = recv( &client, received[1] + read[1],
+ MSGLEN - read[1] );
+ if( ( blocking == 0 ) && ( client_block & 1 ) )
+ {
+ TEST_ASSERT( recv_ret[1] == MBEDTLS_ERR_SSL_WANT_READ );
+ }
+ else
+ {
+ TEST_ASSERT( recv_ret[1] >= 0 );
+ read[1] += recv_ret[1];
+ }
+ client_block >>= 1;
+
+ progress = 0;
+ for( i = 0; i < ROUNDS; i++ )
+ {
+ if( ( send_ret[i] > 0 ) ||
+ ( send_ret[i] == MBEDTLS_ERR_SSL_WANT_WRITE ) )
+ {
+ progress++;
+ }
+
+ if( ( recv_ret[i] > 0 ) ||
+ ( recv_ret[i] == MBEDTLS_ERR_SSL_WANT_READ ) )
+ {
+ progress++;
+ }
+ }
+ }
+
+ for( i = 0; i < ROUNDS; i++ )
+ TEST_ASSERT( memcmp( message[i], received[i], MSGLEN ) == 0 );
+
+exit:
+
+ mbedtls_mock_socket_close( &client );
+ mbedtls_mock_socket_close( &server );
+}
+/* END_CASE */
+
/* BEGIN_CASE depends_on:MBEDTLS_SSL_DTLS_ANTI_REPLAY */
void ssl_dtls_replay( data_t * prevs, data_t * new, int ret )
{