Mbed OS Reference | NetworkStack.h Source File

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 /* 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"
 #include "DNS.h"
 
 /** @file NetworkStack.h NetworkStack class */
 /** @addtogroup netsocket
  * @{ */
 
 // Predeclared classes
 class OnboardNetworkStack;
 
 /** 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 DNS {
 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();
 
     /** Get the local IP address on interface name
      *
      *  @param          interface_name  Network interface_name
      *  @return         Null-terminated representation of the local IP address
      *                  or null if not yet connected
      */
     virtual const char *get_ip_address_if(const char *interface_name);
 
     /** 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  Pointer to a SocketAddress to store the result.
      *  @param version  IP version of address to resolve, NSAPI_UNSPEC indicates
      *                  version is chosen by the stack (defaults to NSAPI_UNSPEC)
      *  @param interface_name  Network interface_name
      *  @return         NSAPI_ERROR_OK on success, negative error code on failure
      */
     virtual nsapi_error_t gethostbyname(const char *host,
                                         SocketAddress *address, nsapi_version_t version = NSAPI_UNSPEC, const char *interface_name = NULL);
 
     /** Hostname translation callback (asynchronous)
      *
      *  Callback will be called after DNS resolution completes or a failure occurs.
      *
      *  Callback should not take more than 10ms to execute, otherwise it might
      *  prevent underlying thread processing. A portable user of the callback
      *  should not make calls to network operations due to stack size limitations.
      *  The callback should not perform expensive operations such as socket recv/send
      *  calls or blocking operations.
      *
      *  @param status  NSAPI_ERROR_OK on success, negative error code on failure
      *  @param address On success, destination for the host SocketAddress
      */
     typedef mbed::Callback<void (nsapi_error_t result, SocketAddress *address)> hostbyname_cb_t;
 
     /** Translates a hostname to an IP address (asynchronous)
      *
      *  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.
      *
      *  Call is non-blocking. Result of the DNS operation is returned by the callback.
      *  If this function returns failure, callback will not be called. In case result
      *  is success (IP address was found from DNS cache), callback will be called
      *  before function returns.
      *
      *  @param host     Hostname to resolve
      *  @param callback Callback that is called for result
      *  @param version  IP version of address to resolve, NSAPI_UNSPEC indicates
      *                  version is chosen by the stack (defaults to NSAPI_UNSPEC)
      *  @param interface_name  Network interface_name
      *  @return         0 on immediate success,
      *                  negative error code on immediate failure or
      *                  a positive unique id that represents the hostname translation operation
      *                  and can be passed to cancel
      */
     virtual nsapi_value_or_error_t gethostbyname_async(const char *host, hostbyname_cb_t callback, nsapi_version_t version = NSAPI_UNSPEC,
                                                        const char *interface_name = NULL);
 
     /** Cancels asynchronous hostname translation
      *
      *  When translation is cancelled, callback will not be called.
      *
      *  @param id       Unique id of the hostname translation operation
      *  @return         NSAPI_ERROR_OK on success, negative error code on failure
      */
     virtual nsapi_error_t gethostbyname_async_cancel(int id);
 
     /** Add a domain name server to list of servers to query
      *
      *  @param address  Destination for the host address
      *  @param interface_name  Network interface name
      *  @return         NSAPI_ERROR_OK on success, negative error code on failure
      */
     virtual nsapi_error_t add_dns_server(const SocketAddress &address, const char *interface_name = NULL);
 
     /** Get a domain name server from a list of servers to query
      *
      *  Returns a DNS server address for a index. If returns error no more
      *  DNS servers to read.
      *
      *  @param index    Index of the DNS server, starts from zero
      *  @param address  Destination for the host address
      *  @param interface_name  Network interface name
      *  @return         NSAPI_ERROR_OK on success, negative error code on failure
      */
     virtual nsapi_error_t get_dns_server(int index, SocketAddress *address, const char *interface_name = NULL);
 
     /*  Set stack options
      *
      *  setstackopt allows an application to pass stack-specific options
      *  to the underlying stack using stack-specific level and option names,
      *  or to request generic options using levels from nsapi_stack_level_t.
      *
      *  For unsupported options, NSAPI_ERROR_UNSUPPORTED is returned
      *  and the stack is unmodified.
      *
      *  @param level    Stack-specific protocol level or nsapi_stack_level_t
      *  @param optname  Level-specific option name
      *  @param optval   Option value
      *  @param optlen   Length of the option value
      *  @return         NSAPI_ERROR_OK on success, negative error code on failure
      */
     virtual nsapi_error_t setstackopt(int level, int optname, const void *optval, unsigned optlen);
 
     /*  Get stack options
      *
      *  getstackopt allows an application to retrieve stack-specific options
      *  to the underlying stack using stack-specific level and option names,
      *  or to request generic options using levels from nsapi_stack_level_t.
      *
      *  @param level    Stack-specific protocol level or nsapi_stack_level_t
      *  @param optname  Level-specific option name
      *  @param optval   Destination for option value
      *  @param optlen   Length of the option value
      *  @return         NSAPI_ERROR_OK on success, negative error code on failure
      */
     virtual nsapi_error_t getstackopt(int level, int optname, void *optval, unsigned *optlen);
 
     /** Dynamic downcast to a OnboardNetworkStack */
     virtual OnboardNetworkStack *onboardNetworkStack()
     {
         return 0;
     }
 
 protected:
     friend class InternetSocket;
     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         NSAPI_ERROR_OK on success, negative error code on failure
      */
     virtual nsapi_error_t 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         NSAPI_ERROR_OK on success, negative error code on failure
      */
     virtual nsapi_error_t 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 receive
      *  data. If the IP address is zeroed, only the port is bound.
      *
      *  @param handle   Socket handle
      *  @param address  Local address to bind
      *  @return         NSAPI_ERROR_OK on success, negative error code on failure.
      */
     virtual nsapi_error_t 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         NSAPI_ERROR_OK on success, negative error code on failure
      */
     virtual nsapi_error_t 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         NSAPI_ERROR_OK on success, negative error code on failure
      */
     virtual nsapi_error_t 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         NSAPI_ERROR_OK on success, negative error code on failure
      */
     virtual nsapi_error_t 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 nsapi_size_or_error_t socket_send(nsapi_socket_t handle,
                                               const void *data, nsapi_size_t 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 nsapi_size_or_error_t socket_recv(nsapi_socket_t handle,
                                               void *data, nsapi_size_t 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 nsapi_size_or_error_t socket_sendto(nsapi_socket_t handle, const SocketAddress &address,
                                                 const void *data, nsapi_size_t 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 buffer   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 nsapi_size_or_error_t socket_recvfrom(nsapi_socket_t handle, SocketAddress *address,
                                                   void *buffer, nsapi_size_t 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         NSAPI_ERROR_OK on success, negative error code on failure.
      */
     virtual nsapi_error_t 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         NSAPI_ERROR_OK on success, negative error code on failure.
      */
     virtual nsapi_error_t getsockopt(nsapi_socket_t handle, int level,
                                      int optname, void *optval, unsigned *optlen);
 
 private:
 
     /** Call in callback
       *
       *  Callback is used to call the call in method of the network stack.
       */
     typedef mbed::Callback<nsapi_error_t (int delay_ms, mbed::Callback<void()> user_cb)> call_in_callback_cb_t;
 
     /** Get a call in callback
      *
      *  Get a call in callback from the network stack context.
      *
      *  Callback should not take more than 10ms to execute, otherwise it might
      *  prevent underlying thread processing. A portable user of the callback
      *  should not make calls to network operations due to stack size limitations.
      *  The callback should not perform expensive operations such as socket recv/send
      *  calls or blocking operations.
      *
      *  @return         Call in callback
      */
     virtual call_in_callback_cb_t get_call_in_callback();
 
     /** Call a callback after a delay
      *
      *  Call a callback from the network stack context after a delay. If function
      *  returns error callback will not be called.
      *
      *  @param delay    Delay in milliseconds
      *  @param func     Callback to be called
      *  @return         NSAPI_ERROR_OK on success, negative error code on failure
      */
     virtual nsapi_error_t call_in(int delay, mbed::Callback<void()> func);
 };
 
 /** 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
 
 /** @} */
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