testserver.c

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/* testServer - prints a client's messages and sends user-specified replies */

/* Copyright 1984-1993 Wind River Systems, Inc. */

/*
modification history
--------------------
01b,06dec94,bss  cleaned up.
01a,???????,???  written.
*/

/*
DESCRIPTION
testServer sets up a TCP socket and then  processes a client's requests 
sequentially.  When a client requests service, testServer will print
the message sent by the client, prompt the user for a reply to send, 
and then send the reply.  testServer will continue servicing the 
client until it is done.  Then testServer will exit.  Typically,
a server would sit in an infinite loop processing requests from 
multiple clients.
*/

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

/* defines */

#define MAX_MSG_SIZE 80

#define FOREVER	for (;;)	/* for WRS coding conventions */
#define LOCAL	static

/* typedefs */

typedef int SOCK_FD;

/* forward declarations */
LOCAL void doRequest ();
LOCAL void error ();

/*******************************************************************************
 *
 * main - entry point of testServer
 *
 * This routine sets up a TCP socket and then sits in an infinite
 * loop accepting clients' requests.  When a request is made,
 * doRequest () is called to process the request.
 */

main (argc, argv)
	int argc;
	char **argv;

	{
	u_short				port;
	int					clientAddrLength;
	SOCK_FD				sockFd;
	SOCK_FD				newSockFd;
	struct sockaddr_in	clientAddr;
	struct sockaddr_in	srvAddr;

	clientAddrLength = sizeof (clientAddr);

	/* Get the server port number */
	if (argc != 2)
		{
		fprintf (stderr, "Usage: %s portNumber\n", argv[0]);
		exit (1);
		}
	port = (u_short) atoi(argv[1]);

	/* Create a socket */
	if ( (sockFd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0 )
		error ("Socket failed");

	/* 
	 * Bind to a well known address. INADDR_ANY says any network
	 * interface will do. hton?() routines put things in network
	 * byte order 
	 */

	bzero ((char *)&srvAddr, sizeof (srvAddr));
	srvAddr.sin_family		= AF_INET;	
	srvAddr.sin_port		= htons (port);
	srvAddr.sin_addr.s_addr = INADDR_ANY;

	if (bind (sockFd, &srvAddr, sizeof(srvAddr)) < 0)
		{
		close (sockFd);
		error ("Bind failed");
		}

	/* Queue only one request */
	if (listen (sockFd, 1) < 0)
		{
		close (sockFd);
		error ("Listen failed");
		}

	/* 
	 * Service request. Typically, the server would be in an infinite loop,
	 * granting requests to many clients. In this example, we service just
	 * a single client and then exit.
	 */

	FOREVER
		{
		newSockFd = accept (sockFd, &clientAddr, &clientAddrLength);
		if (newSockFd < 0)
			{
			close (sockFd);
			error ("Accept failed");
			}

		doRequest (newSockFd, &clientAddr);

		printf ("\nServer socket closing\n");	/* These three lines would not */
		close (sockFd);							/* be here in a more typical */
		exit (0);								/* application. */
		}
	}


/************************************************************************
 *
 * doRequest - read the clients requests from the socket and honor them.
 *
 * In a more typical application, this routine would fork of anouther
 * process to handle the request.
 *
 */

LOCAL void doRequest (sock, pClientAddr)
	SOCK_FD sock;
	struct sockaddr_in * pClientAddr;
	{
	char 	buf [MAX_MSG_SIZE];
	int 	msgSize;
	char *	pClientInet;
	u_short	clientPort;

	pClientInet = inet_ntoa(pClientAddr->sin_addr);
	clientPort	= ntohs(pClientAddr->sin_port);

	printf ("Client connected from inet %s, port %d\n\n",
			pClientInet, clientPort );
	
	FOREVER
		{
		msgSize = read (sock, buf, MAX_MSG_SIZE - 1);

		/* Read error ? */
		if (msgSize < 0)
			{
			close (sock);
			error ("Read failed");
			}

		/* Connection closed ? */
		else if (msgSize == 0)
			{
			close (sock);
			break;
			}

		/* Print client message and send reply */
		else
			{
			printf ("Here is your %d byte message: \n%s\n\n", msgSize, buf);
			printf ("Enter message to send back: ");
			fflush (stdout);

			msgSize = read (STDIN_FILENO, buf, MAX_MSG_SIZE);
			buf [msgSize] = '\0';			/* must null terminate string */
	     	if (write (sock, buf, msgSize+1) < 0)
				{
				close (sock);
				error ("Write failed.");
				}
			}
		}
	}



/************************************************************************
 *
 * error - print an error message and exit.
 *
 */

LOCAL void error (pStr)
	char * pStr;
	{
	perror (pStr);
	exit (1);
	}