/* sv_funcs.cpp - TCPechod, TCPchargend, TCPdaytimed, TCPtimed */#include <stdio.h>#include <time.h>#include <winsock.h>#define	BUFFERSIZE	4096		/* max read buffer size	*/void	TCPechod(SOCKET), TCPchargend(SOCKET), TCPdaytimed(SOCKET),	TCPtimed(SOCKET);void	errexit(const char *, ...);/*------------------------------------------------------------------------ * TCPecho - do TCP ECHO on the given socket *------------------------------------------------------------------------ */voidTCPechod(SOCKET fd){	char	buf[BUFFERSIZE];	int	cc;	while (cc = recv(fd, buf, sizeof buf, 0)) {		if (cc == SOCKET_ERROR)			errexit("echo recv: errnum %d\n", GetLastError());		if (send(fd, buf, cc, 0) == SOCKET_ERROR)			errexit("echo send: errnum %d\n", GetLastError());	}	closesocket(fd);}#define	LINELEN		72/*------------------------------------------------------------------------ * TCPchargend - do TCP CHARGEN on the given socket *------------------------------------------------------------------------ */voidTCPchargend(SOCKET fd){	char	c, buf[LINELEN+2];	/* print LINELEN chars + \r\n */	c = ' ';	buf[LINELEN] = '\r';	buf[LINELEN+1] = '\n';	while (1) {		int	i;		for (i=0; i<LINELEN; ++i) {			buf[i] = c++;			if (c > '~')				c = ' ';		}		if (send(fd, buf, LINELEN+2, 0) == SOCKET_ERROR)			break;	}	closesocket(fd);}/*------------------------------------------------------------------------ * TCPdaytimed - do TCP DAYTIME protocol *------------------------------------------------------------------------ */voidTCPdaytimed(SOCKET fd){	char	buf[LINELEN];	time_t	now;	(void) time(&now);	sprintf(buf, "%s", ctime(&now));	(void) send(fd, buf, strlen(buf), 0);	closesocket(fd);}#define	WINEPOCH	2208988800	/* Windows epoch, in UCT secs	*//*------------------------------------------------------------------------ * TCPtimed - do TCP TIME protocol *------------------------------------------------------------------------ */voidTCPtimed(SOCKET fd){	time_t	now;	(void) time(&now);	now = htonl((u_long)(now + WINEPOCH));	(void) send(fd, (char *)&now, sizeof(now), 0);	closesocket(fd);}