mirror of https://github.com/TheAlgorithms/C
83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
/**
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* @file
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* @author [TheShubham99](https://github.com/TheShubham99)
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* @author [Krishna Vedala](https://github.com/kvedala)
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* @brief Client side implementation of UDP client-server model
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* @see client_server/udp_server.c
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*/
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#ifdef _WIN32 // if compiling for Windows
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#define _WINSOCK_DEPRECATED_NO_WARNINGS // will make the code invalid for next
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// MSVC compiler versions
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#include <winsock2.h>
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#define close closesocket /**< map BSD name to Winsock */
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#else // if not windows platform
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <unistd.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define PORT 8080 /**< port number to connect to */
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#define MAXLINE 1024 /**< maximum characters per line */
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#ifdef _WIN32
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/** Cleanup function will be automatically called on program exit */
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void cleanup() { WSACleanup(); }
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#endif
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/** Driver code */
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int main()
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{
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#ifdef _WIN32
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// when using winsock2.h, startup required
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WSADATA wsData;
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if (WSAStartup(MAKEWORD(2, 2), &wsData) != 0)
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{
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perror("WSA Startup error: \n");
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return 0;
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}
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atexit(cleanup); // register at-exit function
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#endif
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int sockfd;
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char buffer[MAXLINE];
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char *hello = "Hello from client";
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struct sockaddr_in servaddr;
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// Creating socket file descriptor
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if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
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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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memset(&servaddr, 0, sizeof(servaddr));
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// Filling server information
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servaddr.sin_family = AF_INET;
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servaddr.sin_port = htons(PORT);
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servaddr.sin_addr.s_addr = INADDR_ANY;
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int n;
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unsigned int len;
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sendto(sockfd, (const char *)hello, strlen(hello), 0,
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(const struct sockaddr *)&servaddr, sizeof(servaddr));
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printf("Hello message sent.\n");
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n = recvfrom(sockfd, (char *)buffer, MAXLINE, MSG_WAITALL,
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(struct sockaddr *)&servaddr, &len);
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buffer[n] = '\0';
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printf("Server : %s\n", buffer);
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close(sockfd);
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return 0;
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}
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