mirror of https://github.com/TheAlgorithms/C
TCP Full Duplex Server Client Communication (#856)
* TCP Full Duplex Server Client Communication * Changes made to successfully complete 5th Check * Update client_server/tcp_full_duplex_server.c Co-authored-by: David Leal <halfpacho@gmail.com> * updating DIRECTORY.md * Update tcp_full_duplex_client.c * Update client_server/tcp_full_duplex_client.c Co-authored-by: David Leal <halfpacho@gmail.com> Co-authored-by: David Leal <halfpacho@gmail.com> Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
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@ -3,6 +3,8 @@
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## Client Server
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## Client Server
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* [Client](https://github.com/TheAlgorithms/C/blob/master/client_server/client.c)
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* [Client](https://github.com/TheAlgorithms/C/blob/master/client_server/client.c)
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* [Server](https://github.com/TheAlgorithms/C/blob/master/client_server/server.c)
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* [Server](https://github.com/TheAlgorithms/C/blob/master/client_server/server.c)
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* [Tcp Full Duplex Client](https://github.com/TheAlgorithms/C/blob/master/client_server/tcp_full_duplex_client.c)
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* [Tcp Full Duplex Server](https://github.com/TheAlgorithms/C/blob/master/client_server/tcp_full_duplex_server.c)
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* [Tcp Half Duplex Client](https://github.com/TheAlgorithms/C/blob/master/client_server/tcp_half_duplex_client.c)
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* [Tcp Half Duplex Client](https://github.com/TheAlgorithms/C/blob/master/client_server/tcp_half_duplex_client.c)
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* [Tcp Half Duplex Server](https://github.com/TheAlgorithms/C/blob/master/client_server/tcp_half_duplex_server.c)
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* [Tcp Half Duplex Server](https://github.com/TheAlgorithms/C/blob/master/client_server/tcp_half_duplex_server.c)
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* [Udp Client](https://github.com/TheAlgorithms/C/blob/master/client_server/udp_client.c)
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* [Udp Client](https://github.com/TheAlgorithms/C/blob/master/client_server/udp_client.c)
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/**
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* @file
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* @author [NVombat](https://github.com/NVombat)
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* @brief Client-side implementation of [TCP Full Duplex
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* Communication](http://www.tcpipguide.com/free/t_SimplexFullDuplexandHalfDuplexOperation.htm)
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* @see tcp_full_duplex_server.c
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*
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* @details
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* The algorithm is based on the simple TCP client and server model. However,
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* instead of the server only sending and the client only receiving data,
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* The server and client can both send and receive data simultaneously. This is
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* implemented by using the `fork` function call so that in the server the child
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* process can recieve data and parent process can send data, and in the client
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* the child process can send data and the parent process can receive data. It
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* runs an infinite loop and can send and receive messages indefinitely until
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* the user exits the loop. In this way, the Full Duplex Form of communication
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* can be represented using the TCP server-client model & socket programming
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*/
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#include <arpa/inet.h> /// For the type in_addr_t and in_port_t
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#include <netdb.h> /// For structures returned by the network database library - formatted internet addresses and port numbers
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#include <netinet/in.h> /// For in_addr and sockaddr_in structures
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#include <stdint.h> /// For specific bit size values of variables
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#include <stdio.h> /// Variable types, several macros, and various functions for performing input and output
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#include <stdlib.h> /// Variable types, several macros, and various functions for performing general functions
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#include <string.h> /// Various functions for manipulating arrays of characters
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#include <sys/socket.h> /// For macro definitions related to the creation of sockets
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#include <sys/types.h> /// For definitions to allow for the porting of BSD programs
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#include <unistd.h> /// For miscellaneous symbolic constants and types, and miscellaneous functions
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#define PORT 10000 /// Define port over which communication will take place
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/**
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* @brief Utility function used to print an error message to `stderr`.
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* It prints `str` and an implementation-defined error
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* message corresponding to the global variable `errno`.
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* @returns void
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*/
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void error()
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{
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perror("Socket Creation Failed");
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exit(EXIT_FAILURE);
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}
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/**
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* @brief Main function
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* @returns 0 on exit
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*/
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int main()
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{
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/** Variable Declarations */
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uint32_t
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sockfd; ///< socket descriptors - Like file handles but for sockets
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char sendbuff[1024],
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recvbuff[1024]; ///< character arrays to read and store string data
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/// for communication
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struct sockaddr_in
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server_addr; ///< asic structures for all syscalls and functions that
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/// deal with internet addresses. Structures for handling
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/// internet addresses
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/**
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* The TCP socket is created using the socket function.
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*
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* AF_INET (Family) - it is an address family that is used to designate the
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* type of addresses that your socket can communicate with
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*
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* SOCK_STREAM (Type) - Indicates TCP Connection - A stream socket provides
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* for the bidirectional, reliable, sequenced, and unduplicated flow of data
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* without record boundaries. Aside from the bidirectionality of data flow,
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* a pair of connected stream sockets provides an interface nearly identical
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* to pipes.
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*
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* 0 (Protocol) - Specifies a particular protocol to be used with the
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* socket. Specifying a protocol of 0 causes socket() to use an unspecified
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* default protocol appropriate for the requested socket type.
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*/
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if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
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{
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error();
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}
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/**
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* Server Address Information
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*
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* The bzero() function erases the data in the n bytes of the memory
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* starting at the location pointed to, by writing zeros (bytes
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* containing '\0') to that area.
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*
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* We bind the server_addr to the internet address and port number thus
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* giving our socket an identity with an address and port where it can
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* listen for connections
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*
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* htons - The htons() function translates a short integer from host byte
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* order to network byte order
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*
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* htonl - The htonl() function translates a long integer from host byte
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* order to network byte order
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*
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* These functions are necessary so that the binding of address and port
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* takes place with data in the correct format
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*/
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bzero(&server_addr, sizeof(server_addr));
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server_addr.sin_family = AF_INET;
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server_addr.sin_port = htons(PORT);
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server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
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printf("Client is running...\n");
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/**
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* Connects the client to the server address using the socket descriptor
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* This enables the two to communicate and exchange data
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*/
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connect(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr));
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printf("Client is connected...\n");
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/**
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* Communication between client and server
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*
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* The bzero() function erases the data in the n bytes of the memory
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* starting at the location pointed to, by writing zeros (bytes
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* containing '\0') to that area. The variables are emptied and then
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* ready for use
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*
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* The fork function call is used to create a child and parent process
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* which run and execute code simultaneously
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*
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* The child process is used to send data and after doing so
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* sleeps for 5 seconds to wait for the parent to receive data
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*
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* The parent process is used to receive data and after doing so
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* sleeps for 5 seconds to wait for the child to send data
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*
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* The server and client can communicate indefinitely till one of them
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* exits the connection
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*
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* Since the exchange of information between the server and client takes
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* place simultaneously this represents FULL DUPLEX COMMUNICATION
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*/
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pid_t pid;
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pid = fork();
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if (pid == 0) /// Value of 0 is for child process
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{
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while (1)
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{
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bzero(&sendbuff, sizeof(sendbuff));
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printf("\nType message here: ");
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fgets(sendbuff, 1024, stdin);
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send(sockfd, sendbuff, strlen(sendbuff) + 1, 0);
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printf("\nMessage sent!\n");
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sleep(5);
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// break;
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}
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}
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else /// Parent Process
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{
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while (1)
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{
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bzero(&recvbuff, sizeof(recvbuff));
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recv(sockfd, recvbuff, sizeof(recvbuff), 0);
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printf("\nSERVER: %s\n", recvbuff);
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sleep(5);
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// break;
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}
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}
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/// Close Socket
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close(sockfd);
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printf("Client is offline...\n");
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return 0;
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}
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@ -0,0 +1,195 @@
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/**
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* @file
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* @author [NVombat](https://github.com/NVombat)
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* @brief Server-side implementation of [TCP Full Duplex
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* Communication](http://www.tcpipguide.com/free/t_SimplexFullDuplexandHalfDuplexOperation.htm)
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* @see tcp_full_duplex_server.c
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*
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* @details
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* The algorithm is based on the simple TCP client and server model. However,
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* instead of the server only sending and the client only receiving data,
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* The server and client can both send and receive data simultaneously. This is
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* implemented by using the `fork` function call so that in the server the child
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* process can recieve data and parent process can send data, and in the client
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* the child process can send data and the parent process can receive data. It
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* runs an infinite loop and can send and receive messages indefinitely until
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* the user exits the loop. In this way, the Full Duplex Form of communication
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* can be represented using the TCP server-client model & socket programming
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*/
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#include <arpa/inet.h> /// For the type in_addr_t and in_port_t
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#include <netdb.h> /// For structures returned by the network database library - formatted internet addresses and port numbers
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#include <netinet/in.h> /// For in_addr and sockaddr_in structures
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#include <stdint.h> /// For specific bit size values of variables
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#include <stdio.h> /// Variable types, several macros, and various functions for performing input and output
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#include <stdlib.h> /// Variable types, several macros, and various functions for performing general functions
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#include <string.h> /// Various functions for manipulating arrays of characters
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#include <sys/socket.h> /// For macro definitions related to the creation of sockets
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#include <sys/types.h> /// For definitions to allow for the porting of BSD programs
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#include <unistd.h> /// For miscellaneous symbolic constants and types, and miscellaneous functions
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#define PORT 10000 /// Define port over which communication will take place
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/**
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* @brief Utility function used to print an error message to `stderr`.
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* It prints `str` and an implementation-defined error
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* message corresponding to the global variable `errno`.
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* @returns void
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*/
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void error()
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{
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perror("Socket Creation Failed");
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exit(EXIT_FAILURE);
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}
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/**
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* @brief Main function
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* @returns 0 on exit
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*/
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int main()
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{
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/** Variable Declarations */
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uint32_t sockfd,
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conn; ///< socket descriptors - Like file handles but for sockets
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char recvbuff[1024],
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sendbuff[1024]; ///< character arrays to read and store string data
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/// for communication
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struct sockaddr_in server_addr,
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client_addr; ///< asic structures for all syscalls and functions that
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/// deal with internet addresses. Structures for handling
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/// internet addresses
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socklen_t ClientLen; /// size of address
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/**
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* The TCP socket is created using the socket function
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*
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* AF_INET (Family) - it is an address family that is used to designate the
|
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|
* type of addresses that your socket can communicate with
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|
*
|
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|
* SOCK_STREAM (Type) - Indicates TCP Connection - A stream socket provides
|
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|
* for the bidirectional, reliable, sequenced, and unduplicated flow of data
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* without record boundaries. Aside from the bidirectionality of data flow,
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|
* a pair of connected stream sockets provides an interface nearly identical
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* to pipes
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*
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* 0 (Protocol) - Specifies a particular protocol to be used with the
|
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* socket. Specifying a protocol of 0 causes socket() to use an unspecified
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* default protocol appropriate for the requested socket type
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*/
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if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
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{
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error(); ///< Error if the socket descriptor has a value lower than 0 -
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/// socket wasnt created
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}
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/**
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* Server Address Information
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*
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* The bzero() function erases the data in the n bytes of the memory
|
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|
* starting at the location pointed to, by writing zeros (bytes
|
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|
* containing '\0') to that area
|
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|
*
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|
* We bind the server_addr to the internet address and port number thus
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|
* giving our socket an identity with an address and port where it can
|
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|
* listen for connections
|
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|
*
|
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|
* htons - The htons() function translates a short integer from host byte
|
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|
* order to network byte order
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|
*
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* htonl - The htonl() function translates a long integer from host byte
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|
* order to network byte order
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*
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* These functions are necessary so that the binding of address and port
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|
* takes place with data in the correct format
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*/
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bzero(&server_addr, sizeof(server_addr));
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server_addr.sin_family = AF_INET;
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server_addr.sin_port = htons(PORT);
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server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
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printf("Server is running...\n");
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/**
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* This binds the socket descriptor to the server thus enabling the server
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* to listen for connections and communicate with other clients
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*/
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if (bind(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0)
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{
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error(); /// If binding is unsuccessful
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}
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/**
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* This is to listen for clients or connections made to the server
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*
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* The limit is currently at 5 but can be increased to listen for
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* more connections
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*
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* It listens to connections through the socket descriptor
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*/
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listen(sockfd, 5);
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printf("Server is listening...\n");
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|
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/**
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* When a connection is found, a socket is created and connection is
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* accepted and established through the socket descriptor
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|
*/
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conn = accept(sockfd, (struct sockaddr *)NULL, NULL);
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printf("Server is connected...\n");
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|
|
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|
/**
|
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|
* Communication between client and server
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|
*
|
||||||
|
* The bzero() function erases the data in the n bytes of the memory
|
||||||
|
* starting at the location pointed to, by writing zeros (bytes
|
||||||
|
* containing '\0') to that area. The variables are emptied and then
|
||||||
|
* ready for use
|
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|
*
|
||||||
|
* The fork function call is used to create a child and parent process
|
||||||
|
* which run and execute code simultaneously
|
||||||
|
*
|
||||||
|
* The child process is used to receive data and after doing so
|
||||||
|
* sleeps for 5 seconds to wait for the parent to send data
|
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|
*
|
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|
* The parent process is used to send data and after doing so
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|
* sleeps for 5 seconds to wait for the child to receive data
|
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|
*
|
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|
* The server and client can communicate indefinitely till one of them
|
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|
* exits the connection
|
||||||
|
*
|
||||||
|
* Since the exchange of information between the server and client takes
|
||||||
|
* place simultaneously this represents FULL DUPLEX COMMUNICATION
|
||||||
|
*/
|
||||||
|
pid_t pid;
|
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|
pid = fork();
|
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|
if (pid == 0) /// Value of 0 is for child process
|
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|
{
|
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|
while (1)
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|
{
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|
bzero(&recvbuff, sizeof(recvbuff));
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|
recv(conn, recvbuff, sizeof(recvbuff), 0);
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|
printf("\nCLIENT : %s\n", recvbuff);
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|
sleep(5);
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|
// break;
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|
}
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|
}
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|
else /// Parent process
|
||||||
|
{
|
||||||
|
while (1)
|
||||||
|
{
|
||||||
|
bzero(&sendbuff, sizeof(sendbuff));
|
||||||
|
printf("\nType message here: ");
|
||||||
|
fgets(sendbuff, 1024, stdin);
|
||||||
|
send(conn, sendbuff, strlen(sendbuff) + 1, 0);
|
||||||
|
printf("\nMessage Sent!\n");
|
||||||
|
sleep(5);
|
||||||
|
// break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Close socket
|
||||||
|
close(sockfd);
|
||||||
|
printf("Server is offline...\n");
|
||||||
|
return 0;
|
||||||
|
}
|
Loading…
Reference in New Issue