udp_server.c File Reference

Server side implementation of UDP client-server model. More...

#include <arpa/inet.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

Include dependency graph for udp_server.c:

Macros
#define	PORT   8080
	port number to connect to
#define	MAXLINE   1024
	maximum characters per line

Functions
int	main ()
	Driver code.

Detailed Description

Server side implementation of UDP client-server model.

Author

TheShubham99

Krishna Vedala

See also

client_server/udp_client.c

Function Documentation

main()

int main

(

void

)

Driver code.

{
#ifdef _WIN32
    // when using winsock2.h, startup required
    WSADATA wsData;
    if (WSAStartup(MAKEWORD(2, 2), &wsData) != 0)
    {
        perror("WSA Startup error: \n");
        return 0;
    }
 
    atexit(cleanup);  // register at-exit function
#endif
 
    int sockfd;
    char buffer[MAXLINE];
    char *hello = "Hello from server";
    struct sockaddr_in servaddr, cliaddr;
 
    // Creating socket file descriptor
    if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
    {
        perror("socket creation failed");
        exit(EXIT_FAILURE);
    }
 
    memset(&servaddr, 0, sizeof(servaddr));
    memset(&cliaddr, 0, sizeof(cliaddr));
 
    // Filling server information
    servaddr.sin_family = AF_INET;  // IPv4
    servaddr.sin_addr.s_addr = INADDR_ANY;
    servaddr.sin_port = htons(PORT);
 
    // Bind the socket with the server address
    if (bind(sockfd, (const struct sockaddr *)&servaddr, sizeof(servaddr)) < 0)
    {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }
 
    unsigned int len;
    int n;
    n = recvfrom(sockfd, (char *)buffer, MAXLINE, MSG_WAITALL,
                 (struct sockaddr *)&cliaddr, &len);
    buffer[n] = '\0';
    printf("Client : %s\n", buffer);
    sendto(sockfd, (const char *)hello, strlen(hello), 0,
           (const struct sockaddr *)&cliaddr, len);
    printf("Hello message sent.\n");
 
    close(sockfd);
 
    return 0;
}