Simon Cooksey
Pinned to some recent date
Diff: features/netsocket/NetworkStack.h
- Revision:
- 0:fb7af294d5d9
diff -r 000000000000 -r fb7af294d5d9 features/netsocket/NetworkStack.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/features/netsocket/NetworkStack.h Thu Nov 17 16:43:53 2016 +0000
@@ -0,0 +1,315 @@
+
+/** \addtogroup netsocket */
+/** @{*/
+/* NetworkStack
+ * Copyright (c) 2015 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef NETWORK_STACK_H
+#define NETWORK_STACK_H
+
+#include "nsapi_types.h"
+#include "netsocket/SocketAddress.h"
+#include "netsocket/NetworkInterface.h"
+
+
+/** NetworkStack class
+ *
+ * Common interface that is shared between hardware that
+ * can connect to a network over IP. By implementing the
+ * NetworkStack, a network stack can be used as a target
+ * for instantiating network sockets.
+ */
+class NetworkStack
+{
+public:
+ virtual ~NetworkStack() {};
+
+ /** Get the local IP address
+ *
+ * @return Null-terminated representation of the local IP address
+ * or null if not yet connected
+ */
+ virtual const char *get_ip_address() = 0;
+
+ /** Translates a hostname to an IP address with specific version
+ *
+ * The hostname may be either a domain name or an IP address. If the
+ * hostname is an IP address, no network transactions will be performed.
+ *
+ * If no stack-specific DNS resolution is provided, the hostname
+ * will be resolve using a UDP socket on the stack.
+ *
+ * @param host Hostname to resolve
+ * @param address Destination for the host SocketAddress
+ * @param version IP version of address to resolve, NSAPI_UNSPEC indicates
+ * version is chosen by the stack (defaults to NSAPI_UNSPEC)
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int gethostbyname(const char *host, SocketAddress *address, nsapi_version_t version = NSAPI_UNSPEC);
+
+ /** Add a domain name server to list of servers to query
+ *
+ * @param addr Destination for the host address
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int add_dns_server(const SocketAddress &address);
+
+ /* Set stack-specific stack options
+ *
+ * The setstackopt allow an application to pass stack-specific hints
+ * to the underlying stack. For unsupported options,
+ * NSAPI_ERROR_UNSUPPORTED is returned and the stack is unmodified.
+ *
+ * @param level Stack-specific protocol level
+ * @param optname Stack-specific option identifier
+ * @param optval Option value
+ * @param optlen Length of the option value
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int setstackopt(int level, int optname, const void *optval, unsigned optlen);
+
+ /* Get stack-specific stack options
+ *
+ * The getstackopt allow an application to retrieve stack-specific hints
+ * from the underlying stack. For unsupported options,
+ * NSAPI_ERROR_UNSUPPORTED is returned and optval is unmodified.
+ *
+ * @param level Stack-specific protocol level
+ * @param optname Stack-specific option identifier
+ * @param optval Destination for option value
+ * @param optlen Length of the option value
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int getstackopt(int level, int optname, void *optval, unsigned *optlen);
+
+protected:
+ friend class Socket;
+ friend class UDPSocket;
+ friend class TCPSocket;
+ friend class TCPServer;
+
+ /** Opens a socket
+ *
+ * Creates a network socket and stores it in the specified handle.
+ * The handle must be passed to following calls on the socket.
+ *
+ * A stack may have a finite number of sockets, in this case
+ * NSAPI_ERROR_NO_SOCKET is returned if no socket is available.
+ *
+ * @param handle Destination for the handle to a newly created socket
+ * @param proto Protocol of socket to open, NSAPI_TCP or NSAPI_UDP
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int socket_open(nsapi_socket_t *handle, nsapi_protocol_t proto) = 0;
+
+ /** Close the socket
+ *
+ * Closes any open connection and deallocates any memory associated
+ * with the socket.
+ *
+ * @param handle Socket handle
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int socket_close(nsapi_socket_t handle) = 0;
+
+ /** Bind a specific address to a socket
+ *
+ * Binding a socket specifies the address and port on which to recieve
+ * data. If the IP address is zeroed, only the port is bound.
+ *
+ * @param handle Socket handle
+ * @param address Local address to bind
+ * @return 0 on success, negative error code on failure.
+ */
+ virtual int socket_bind(nsapi_socket_t handle, const SocketAddress &address) = 0;
+
+ /** Listen for connections on a TCP socket
+ *
+ * Marks the socket as a passive socket that can be used to accept
+ * incoming connections.
+ *
+ * @param handle Socket handle
+ * @param backlog Number of pending connections that can be queued
+ * simultaneously
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int socket_listen(nsapi_socket_t handle, int backlog) = 0;
+
+ /** Connects TCP socket to a remote host
+ *
+ * Initiates a connection to a remote server specified by the
+ * indicated address.
+ *
+ * @param handle Socket handle
+ * @param address The SocketAddress of the remote host
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int socket_connect(nsapi_socket_t handle, const SocketAddress &address) = 0;
+
+ /** Accepts a connection on a TCP socket
+ *
+ * The server socket must be bound and set to listen for connections.
+ * On a new connection, creates a network socket and stores it in the
+ * specified handle. The handle must be passed to following calls on
+ * the socket.
+ *
+ * A stack may have a finite number of sockets, in this case
+ * NSAPI_ERROR_NO_SOCKET is returned if no socket is available.
+ *
+ * This call is non-blocking. If accept would block,
+ * NSAPI_ERROR_WOULD_BLOCK is returned immediately.
+ *
+ * @param server Socket handle to server to accept from
+ * @param handle Destination for a handle to the newly created socket
+ * @param address Destination for the remote address or NULL
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int socket_accept(nsapi_socket_t server, nsapi_socket_t *handle, SocketAddress *address=0) = 0;
+
+ /** Send data over a TCP socket
+ *
+ * The socket must be connected to a remote host. Returns the number of
+ * bytes sent from the buffer.
+ *
+ * This call is non-blocking. If send would block,
+ * NSAPI_ERROR_WOULD_BLOCK is returned immediately.
+ *
+ * @param handle Socket handle
+ * @param data Buffer of data to send to the host
+ * @param size Size of the buffer in bytes
+ * @return Number of sent bytes on success, negative error
+ * code on failure
+ */
+ virtual int socket_send(nsapi_socket_t handle, const void *data, unsigned size) = 0;
+
+ /** Receive data over a TCP socket
+ *
+ * The socket must be connected to a remote host. Returns the number of
+ * bytes received into the buffer.
+ *
+ * This call is non-blocking. If recv would block,
+ * NSAPI_ERROR_WOULD_BLOCK is returned immediately.
+ *
+ * @param handle Socket handle
+ * @param data Destination buffer for data received from the host
+ * @param size Size of the buffer in bytes
+ * @return Number of received bytes on success, negative error
+ * code on failure
+ */
+ virtual int socket_recv(nsapi_socket_t handle, void *data, unsigned size) = 0;
+
+ /** Send a packet over a UDP socket
+ *
+ * Sends data to the specified address. Returns the number of bytes
+ * sent from the buffer.
+ *
+ * This call is non-blocking. If sendto would block,
+ * NSAPI_ERROR_WOULD_BLOCK is returned immediately.
+ *
+ * @param handle Socket handle
+ * @param address The SocketAddress of the remote host
+ * @param data Buffer of data to send to the host
+ * @param size Size of the buffer in bytes
+ * @return Number of sent bytes on success, negative error
+ * code on failure
+ */
+ virtual int socket_sendto(nsapi_socket_t handle, const SocketAddress &address, const void *data, unsigned size) = 0;
+
+ /** Receive a packet over a UDP socket
+ *
+ * Receives data and stores the source address in address if address
+ * is not NULL. Returns the number of bytes received into the buffer.
+ *
+ * This call is non-blocking. If recvfrom would block,
+ * NSAPI_ERROR_WOULD_BLOCK is returned immediately.
+ *
+ * @param handle Socket handle
+ * @param address Destination for the source address or NULL
+ * @param data Destination buffer for data received from the host
+ * @param size Size of the buffer in bytes
+ * @return Number of received bytes on success, negative error
+ * code on failure
+ */
+ virtual int socket_recvfrom(nsapi_socket_t handle, SocketAddress *address, void *buffer, unsigned size) = 0;
+
+ /** Register a callback on state change of the socket
+ *
+ * The specified callback will be called on state changes such as when
+ * the socket can recv/send/accept successfully and on when an error
+ * occurs. The callback may also be called spuriously without reason.
+ *
+ * The callback may be called in an interrupt context and should not
+ * perform expensive operations such as recv/send calls.
+ *
+ * @param handle Socket handle
+ * @param callback Function to call on state change
+ * @param data Argument to pass to callback
+ */
+ virtual void socket_attach(nsapi_socket_t handle, void (*callback)(void *), void *data) = 0;
+
+ /* Set stack-specific socket options
+ *
+ * The setsockopt allow an application to pass stack-specific hints
+ * to the underlying stack. For unsupported options,
+ * NSAPI_ERROR_UNSUPPORTED is returned and the socket is unmodified.
+ *
+ * @param handle Socket handle
+ * @param level Stack-specific protocol level
+ * @param optname Stack-specific option identifier
+ * @param optval Option value
+ * @param optlen Length of the option value
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int setsockopt(nsapi_socket_t handle, int level, int optname, const void *optval, unsigned optlen);
+
+ /* Get stack-specific socket options
+ *
+ * The getstackopt allow an application to retrieve stack-specific hints
+ * from the underlying stack. For unsupported options,
+ * NSAPI_ERROR_UNSUPPORTED is returned and optval is unmodified.
+ *
+ * @param handle Socket handle
+ * @param level Stack-specific protocol level
+ * @param optname Stack-specific option identifier
+ * @param optval Destination for option value
+ * @param optlen Length of the option value
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int getsockopt(nsapi_socket_t handle, int level, int optname, void *optval, unsigned *optlen);
+};
+
+
+/** Convert a raw nsapi_stack_t object into a C++ NetworkStack object
+ *
+ * @param stack Reference to an object that can be converted to a stack
+ * - A raw nsapi_stack_t object
+ * - A reference to a network stack
+ * - A reference to a network interface
+ * @return Reference to the underlying network stack
+ */
+NetworkStack *nsapi_create_stack(nsapi_stack_t *stack);
+NetworkStack *nsapi_create_stack(NetworkStack *stack);
+
+template <typename IF>
+NetworkStack *nsapi_create_stack(IF *iface)
+{
+ return nsapi_create_stack(static_cast<NetworkInterface *>(iface)->get_stack());
+}
+
+
+#endif
+
+/** @}*/