/*******************
 *  echoServer.c
 * By Hunter Pitelka
 *   15-213 s09
 *******************/

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

#define MAXPENDING 5

void HandleTCPClient(int clntSocket);

int main(int argc, char *argv[]){

	int servSock;
	int clntSock;
	struct sockaddr_in echoServAddr;
	struct sockaddr_in echoClntAddr;
	unsigned short echoServPort;
	unsigned int clntLen;

	if(argc != 2){
		fprintf(stderr,"Usage: %s <Server Port>\n",argv[0]);
		exit(1);
	}

	echoServPort = atoi(argv[1]);

	if((servSock = socket(PF_INET,SOCK_STREAM,IPPROTO_TCP)) <0){
		perror("socket failed");
		exit(1);
	}

	memset(&echoServAddr , 0, sizeof(echoServAddr));
	echoServAddr.sin_family = AF_INET;
	echoServAddr.sin_addr.s_addr = htonl(INADDR_ANY);
	echoServAddr.sin_port = htons(echoServPort);

	if(bind(servSock, (struct sockaddr *) &echoServAddr, 
			sizeof(echoServAddr)) <0){
		perror("bind failed");
		exit(1);
	}

	if(listen(servSock,MAXPENDING)<0){
		perror("listen failed");
		exit(1);
	}

	for(;;){
		clntLen = sizeof(echoClntAddr);

		if((clntSock = accept(servSock, (struct sockaddr *) &echoClntAddr, 
				&clntLen)) <0){
			perror("accept failed");
			continue;
		}

		printf("Handling client %s\n",inet_ntoa(echoClntAddr.sin_addr));

		HandleTCPClient(clntSock);
		close(clntSock);

	}
}