Server-udp.c

#include<sys/types.h>
#include<netinet/in.h>
#include<sys/socket.h>
#include<stdio.h>
#include<string.h>
#include<fcntl.h>
#include<unistd.h>

#define MYPORT 9303
#define BUFSIZE 2048

int main(int argc, char **argv)
{
    struct sockaddr_in myaddr;
    struct sockaddr_in remaddr;

    socklen_t addrlen = sizeof(remaddr);
    int sockfd, recvlen, fd, count;
    char buf[BUFSIZE];

    if((sockfd = socket(AF_INET,SOCK_DGRAM,0))<0)
    {
        perror("cannot create socket");
        return 0;
    }
    printf("created socket: descriptor = %d\n",sockfd);

    memset((void *)&myaddr, 0, sizeof(myaddr));
    myaddr.sin_family = AF_INET;
    myaddr.sin_addr.s_addr = htonl(INADDR_ANY);
    myaddr.sin_port = htons(MYPORT);

    if(bind(sockfd, (struct sockaddr *)&myaddr, sizeof(myaddr)) < 0)
    {
        perror("bind failed");
        return 0;
    }
    printf("bind complete. Port number = %d\n",ntohs(myaddr.sin_port));


//Code to receive & send the data
        printf("waiting on port %d\n",MYPORT);
        recvlen = recvfrom(sockfd, buf, BUFSIZE, 0, (struct sockaddr *)&remaddr, &addrlen);
        printf("received %d bytes\n", recvlen);
        if(recvlen > 0)
        {
            buf[recvlen]=0;
            printf("received message: \"%s\"\n",buf);
        }
        if((fd=open(buf,O_RDONLY,0))<0){
                perror("File not found");
                exit(0);
        }
        while((count=read(fd,buf,BUFSIZE))>0)
            printf("%d",count);

        sendto(sockfd, count, count, 0, (struct sockaddr *)&remaddr, &addrlen);


}