contiki/core/net/ip/tcp-socket.h

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/*
* Copyright (c) 2012-2014, Thingsquare, http://www.thingsquare.com/.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef TCP_SOCKET_H
#define TCP_SOCKET_H
#include "uip.h"
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struct tcp_socket;
typedef enum {
TCP_SOCKET_CONNECTED,
TCP_SOCKET_CLOSED,
TCP_SOCKET_TIMEDOUT,
TCP_SOCKET_ABORTED,
TCP_SOCKET_DATA_SENT
} tcp_socket_event_t;
/**
* \brief TCP data callback function
* \param s A pointer to a TCP socket
* \param ptr A user-defined pointer
* \param input_data_ptr A pointer to the incoming data
* \param input_data_len The length of the incoming data
* \return The function should return the number of bytes to leave in the input buffer
*
* The TCP socket input callback function gets
* called whenever there is new data on the socket. The
* function can choose to either consume the data
* directly, or leave it in the buffer for later. The
* function must return the amount of data to leave in the
* buffer. I.e., if the callback function consumes all
* incoming data, it should return 0.
*/
typedef int (* tcp_socket_data_callback_t)(struct tcp_socket *s,
void *ptr,
const uint8_t *input_data_ptr,
int input_data_len);
/**
* \brief TCP event callback function
* \param s A pointer to a TCP socket
* \param ptr A user-defined pointer
* \param event The event number
*
* The TCP socket event callback function gets
* called whenever there is an event on a socket, such as
* the socket getting connected or closed.
*/
typedef void (* tcp_socket_event_callback_t)(struct tcp_socket *s,
void *ptr,
tcp_socket_event_t event);
struct tcp_socket {
struct tcp_socket *next;
tcp_socket_data_callback_t input_callback;
tcp_socket_event_callback_t event_callback;
void *ptr;
struct process *p;
uint8_t *input_data_ptr;
uint8_t *output_data_ptr;
uint16_t input_data_maxlen;
uint16_t input_data_len;
uint16_t output_data_maxlen;
uint16_t output_data_len;
uint16_t output_data_send_nxt;
uint16_t output_senddata_len;
uint16_t output_data_max_seg;
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uint8_t flags;
uint16_t listen_port;
struct uip_conn *c;
};
enum {
TCP_SOCKET_FLAGS_NONE = 0x00,
TCP_SOCKET_FLAGS_LISTENING = 0x01,
TCP_SOCKET_FLAGS_CLOSING = 0x02,
};
/**
* \brief Register a TCP socket
* \param s A pointer to a TCP socket
* \param ptr A user-defined pointer that will be sent to callbacks for this socket
* \param input_databuf A pointer to a memory area this socket will use for input data
* \param input_databuf_len The size of the input data buffer
* \param output_databuf A pointer to a memory area this socket will use for outgoing data
* \param output_databuf_len The size of the output data buffer
* \param data_callback A pointer to the data callback function for this socket
* \param event_callback A pointer to the event callback function for this socket
* \retval -1 If an error occurs
* \retval 1 If the operation succeeds.
*
* This function registers a TCP socket. The function sets
* up the output and input buffers for the socket and
* callback pointers.
*
* TCP sockets use input and output buffers for incoming
* and outgoing data. The memory for these buffers must be
* allocated by the caller. The size of the buffers
* determine the amount of data that can be received and
* sent, and the principle is that the application that
* sets up the TCP socket will know roughly how large
* these buffers should be. The rule of thumb is that the
* input buffer should be large enough to hold the largest
* application layer message that the application will
* receive and the output buffer should be large enough to
* hold the largest application layer message the
* application will send.
*
* TCP throttles incoming data so that if the input buffer
* is filled, the connection will halt until the
* application has read out the data from the input
* buffer.
*
*/
int tcp_socket_register(struct tcp_socket *s, void *ptr,
uint8_t *input_databuf, int input_databuf_len,
uint8_t *output_databuf, int output_databuf_len,
tcp_socket_data_callback_t data_callback,
tcp_socket_event_callback_t event_callback);
/**
* \brief Connect a TCP socket to a remote host
* \param s A pointer to a TCP socket that must have been previously registered with tcp_socket_register()
* \param ipaddr The IP address of the remote host
* \param port The TCP port number, in host byte order, of the remote host
* \retval -1 If an error occurs
* \retval 1 If the operation succeeds.
*
* This function connects a TCP socket to a remote host.
*
* When the socket has connected, the event callback will
* get called with the TCP_SOCKET_CONNECTED event. If the
* remote host does not accept the connection, the
* TCP_SOCKET_ABORTED will be sent to the callback. If the
* connection times out before conecting to the remote
* host, the TCP_SOCKET_TIMEDOUT event is sent to the
* callback.
*
*/
int tcp_socket_connect(struct tcp_socket *s,
const uip_ipaddr_t *ipaddr,
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uint16_t port);
/**
* \brief Start listening on a specific port
* \param s A pointer to a TCP socket that must have been previously registered with tcp_socket_register()
* \param port The TCP port number, in host byte order, of the remote host
* \retval -1 If an error occurs
* \retval 1 If the operation succeeds.
*
* This function causes the TCP socket to start listening
* on the given TCP port.
*
* Several sockets can listen on the same port. If a
* remote host connects to the port, one of the listening
* sockets will get connected and the event callback will
* be called with the TCP_SOCKET_CONNECTED event. When the
* connection closes, the socket will go back to listening
* for new connections.
*
*/
int tcp_socket_listen(struct tcp_socket *s,
uint16_t port);
/**
* \brief Stop listening for new connections
* \param s A pointer to a TCP socket that must have been previously registered with tcp_socket_register()
* \retval -1 If an error occurs
* \retval 1 If the operation succeeds.
*
* This function causes a listening TCP socket to stop
* listen. The socket must previously been put into listen
* mode with tcp_socket_listen().
*
*/
int tcp_socket_unlisten(struct tcp_socket *s);
/**
* \brief Send data on a connected TCP socket
* \param s A pointer to a TCP socket that must have been previously registered with tcp_socket_register()
* \param dataptr A pointer to the data to be sent
* \param datalen The length of the data to be sent
* \retval -1 If an error occurs
* \return The number of bytes that were successfully sent
*
* This function sends data over a connected TCP
* socket. The data is placed in the output buffer and
* sent to the remote host as soon as possiblce. When the
* data has been acknowledged by the remote host, the
* event callback is sent with the TCP_SOCKET_DATA_SENT
* event.
*/
int tcp_socket_send(struct tcp_socket *s,
const uint8_t *dataptr,
int datalen);
/**
* \brief Send a string on a connected TCP socket
* \param s A pointer to a TCP socket that must have been previously registered with tcp_socket_register()
* \param strptr A pointer to the string to be sent
* \retval -1 If an error occurs
* \return The number of bytes that were successfully sent
*
* This is a convenience function for sending strings on a
* TCP socket. The function calls tcp_socket_send() to
* send the string.
*/
int tcp_socket_send_str(struct tcp_socket *s,
const char *strptr);
/**
* \brief Close a connected TCP socket
* \param s A pointer to a TCP socket that must have been previously registered with tcp_socket_register()
* \retval -1 If an error occurs
* \retval 1 If the operation succeeds.
*
* This function closes a connected TCP socket. When the
* socket has been successfully closed, the event callback
* is called with the TCP_SOCKET_CLOSED event.
*
*/
int tcp_socket_close(struct tcp_socket *s);
/**
* \brief Unregister a registered socket
* \param s A pointer to a TCP socket that must have been previously registered with tcp_socket_register()
* \retval -1 If an error occurs
* \retval 1 If the operation succeeds.
*
* This function unregisters a previously registered
* socket. This must be done if the process will be
* unloaded from memory. If the TCP socket is connected,
* the connection will be reset.
*
*/
int tcp_socket_unregister(struct tcp_socket *s);
/**
* \brief The maximum amount of data that could currently be sent
* \param s A pointer to a TCP socket
* \return The number of bytes available in the output buffer
*
* This function queries the TCP socket and returns the
* number of bytes available in the output buffer. This
* function is used before calling tcp_socket_send() to
* ensure that one application level message can be held
* in the output buffer.
*
*/
int tcp_socket_max_sendlen(struct tcp_socket *s);
/**
* \brief The number of bytes waiting to be sent
* \param s A pointer to a TCP socket
* \return The number of bytes that have not yet been acknowledged by the receiver.
*
* This function queries the TCP socket and returns the
* number of bytes that are currently not yet known to
* have been successfully received by the receiver.
*
*/
int tcp_socket_queuelen(struct tcp_socket *s);
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#endif /* TCP_SOCKET_H */