TCPSocket.h

00001 
00002 /** \addtogroup netsocket */
00003 /** @{*/
00004 /* TCPSocket
00005  * Copyright (c) 2015 ARM Limited
00006  *
00007  * Licensed under the Apache License, Version 2.0 (the "License");
00008  * you may not use this file except in compliance with the License.
00009  * You may obtain a copy of the License at
00010  *
00011  *     http://www.apache.org/licenses/LICENSE-2.0
00012  *
00013  * Unless required by applicable law or agreed to in writing, software
00014  * distributed under the License is distributed on an "AS IS" BASIS,
00015  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00016  * See the License for the specific language governing permissions and
00017  * limitations under the License.
00018  */
00019 
00020 #ifndef TCPSOCKET_H
00021 #define TCPSOCKET_H
00022 
00023 #include "netsocket/InternetSocket.h"
00024 #include "netsocket/NetworkStack.h"
00025 #include "netsocket/NetworkInterface.h"
00026 #include "rtos/EventFlags.h"
00027 
00028 
00029 /** TCP socket connection
00030  */
00031 class TCPSocket : public InternetSocket {
00032 public:
00033     /** Create an uninitialized socket
00034      *
00035      *  Must call open to initialize the socket on a network stack.
00036      */
00037     TCPSocket();
00038 
00039     /** Create a socket on a network interface
00040      *
00041      *  Creates and opens a socket on the network stack of the given
00042      *  network interface.
00043      *
00044      *  @param stack    Network stack as target for socket
00045      */
00046     template <typename S>
00047     TCPSocket(S *stack)
00048     {
00049         open(stack);
00050     }
00051 
00052     /** Destroy a socket
00053      *
00054      *  Closes socket if the socket is still open
00055      */
00056     virtual ~TCPSocket();
00057 
00058     /** Override multicast functions to return error for TCP
00059      *
00060      */
00061     virtual int join_multicast_group(const SocketAddress &address)
00062     {
00063         return NSAPI_ERROR_UNSUPPORTED ;
00064     }
00065 
00066     /** Connects TCP socket to a remote host
00067      *
00068      *  Initiates a connection to a remote server specified by either
00069      *  a domain name or an IP address and a port.
00070      *
00071      *  @param host     Hostname of the remote host
00072      *  @param port     Port of the remote host
00073      *  @return         0 on success, negative error code on failure
00074      */
00075     nsapi_error_t connect(const char *host, uint16_t port);
00076 
00077     /** Connects TCP socket to a remote host
00078      *
00079      *  Initiates a connection to a remote server specified by the
00080      *  indicated address.
00081      *
00082      *  @param address  The SocketAddress of the remote host
00083      *  @return         0 on success, negative error code on failure
00084      */
00085     virtual nsapi_error_t connect(const SocketAddress &address);
00086 
00087     /** Send data over a TCP socket
00088      *
00089      *  The socket must be connected to a remote host. Returns the number of
00090      *  bytes sent from the buffer.
00091      *
00092      *  By default, send blocks until all data is sent. If socket is set to
00093      *  non-blocking or times out, a partial amount can be written.
00094      *  NSAPI_ERROR_WOULD_BLOCK is returned if no data was written.
00095      *
00096      *  @param data     Buffer of data to send to the host
00097      *  @param size     Size of the buffer in bytes
00098      *  @return         Number of sent bytes on success, negative error
00099      *                  code on failure
00100      */
00101     virtual nsapi_size_or_error_t send(const void *data, nsapi_size_t size);
00102 
00103     /** Receive data over a TCP socket
00104      *
00105      *  The socket must be connected to a remote host. Returns the number of
00106      *  bytes received into the buffer.
00107      *
00108      *  By default, recv blocks until some data is received. If socket is set to
00109      *  non-blocking or times out, NSAPI_ERROR_WOULD_BLOCK can be returned to
00110      *  indicate no data.
00111      *
00112      *  @param data     Destination buffer for data received from the host
00113      *  @param size     Size of the buffer in bytes
00114      *  @return         Number of received bytes on success, negative error
00115      *                  code on failure. If no data is available to be received
00116      *                  and the peer has performed an orderly shutdown,
00117      *                  recv() returns 0.
00118      */
00119     virtual nsapi_size_or_error_t recv(void *data, nsapi_size_t size);
00120 
00121     /** Send data on a socket.
00122      *
00123      * TCP socket is connection oriented protocol, so address is ignored.
00124      *
00125      * By default, sendto blocks until data is sent. If socket is set to
00126      * non-blocking or times out, NSAPI_ERROR_WOULD_BLOCK is returned
00127      * immediately.
00128      *
00129      *  @param address  Remote address
00130      *  @param data     Buffer of data to send to the host
00131      *  @param size     Size of the buffer in bytes
00132      *  @return         Number of sent bytes on success, negative error
00133      *                  code on failure
00134      */
00135     virtual nsapi_size_or_error_t sendto(const SocketAddress &address,
00136                                          const void *data, nsapi_size_t size);
00137 
00138     /** Receive a data from a socket
00139      *
00140      *  Receives a data and stores the source address in address if address
00141      *  is not NULL. Returns the number of bytes written into the buffer.
00142      *
00143      *  By default, recvfrom blocks until a data is received. If socket is set to
00144      *  non-blocking or times out with no datagram, NSAPI_ERROR_WOULD_BLOCK
00145      *  is returned.
00146      *
00147      *  @param address  Destination for the source address or NULL
00148      *  @param data     Destination buffer for datagram received from the host
00149      *  @param size     Size of the buffer in bytes
00150      *  @return         Number of received bytes on success, negative error
00151      *                  code on failure
00152      */
00153     virtual nsapi_size_or_error_t recvfrom(SocketAddress *address,
00154                                            void *data, nsapi_size_t size);
00155 
00156     /** Accepts a connection on a socket.
00157      *
00158      *  The server socket must be bound and set to listen for connections.
00159      *  On a new connection, returns connected network socket which user is expected to call close()
00160      *  and that deallocates the resources. Referencing a returned pointer after a close()
00161      *  call is not allowed and leads to undefined behaviour.
00162      *
00163      *  By default, accept blocks until incomming connection occurs. If socket is set to
00164      *  non-blocking or times out, error is set to NSAPI_ERROR_WOULD_BLOCK.
00165      *
00166      *  @param error      pointer to storage of the error value or NULL
00167      *  @return           pointer to a socket
00168      */
00169     virtual TCPSocket *accept(nsapi_error_t *error = NULL);
00170 
00171     /** Listen for incoming connections.
00172      *
00173      *  Marks the socket as a passive socket that can be used to accept
00174      *  incoming connections.
00175      *
00176      *  @param backlog  Number of pending connections that can be queued
00177      *                  simultaneously, defaults to 1
00178      *  @return         0 on success, negative error code on failure
00179      */
00180     virtual nsapi_error_t listen(int backlog = 1);
00181 
00182 protected:
00183     friend class TCPServer;
00184     virtual nsapi_protocol_t get_proto();
00185 
00186 private:
00187     /** Create a socket out of a given socket
00188      *
00189      *  To be used within accept() function. Close() will clean this up.
00190      */
00191     TCPSocket(TCPSocket *parent, nsapi_socket_t socket, SocketAddress address);
00192 };
00193 
00194 
00195 #endif
00196 
00197 /** @}*/