server.c

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

#define MAXLINE 256 

int main()
{
	struct sockaddr_in serv, cli;
	socklen_t clilen;
	int listenfd, connectfd;
	char buf[MAXLINE];
	char str[INET_ADDRSTRLEN];
	int i, len;

	bzero(&serv, sizeof(serv));
	serv.sin_family = PF_INET;
	serv.sin_addr.s_addr = htonl(INADDR_ANY);
	serv.sin_port = htons(8000);

	listenfd = socket(PF_INET, SOCK_STREAM, 0);
	bind(listenfd, (struct sockaddr *)&serv, sizeof(serv));
	listen(listenfd, 100);
	printf("Accepting connection...\n");

	while (1) {
		clilen = sizeof(cli);
		connectfd = accept(listenfd, (struct sockaddr *)&cli, &clilen);
		read(connectfd, buf, MAXLINE);

		printf("Reveived from client %s at port %d: %s\n",
				inet_ntop(PF_INET, &cli.sin_addr, str, sizeof(str)),
				ntohs(cli.sin_port), buf);
		
		len = strlen(buf);
		for (i=0; i<len; i++) buf[i] = toupper(buf[i]);
		write(connectfd, buf, len+1);
		close(connectfd);
	}

	exit(0);
}