xref: /src/libexec/telnetd/telnetd.c

/*	$NetBSD: telnetd.c,v 1.20 2000/01/13 13:11:31 ad Exp $	*/

/*
 * Copyright (C) 1997 and 1998 WIDE Project.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1989, 1993\n\
	The Regents of the University of California.  All rights reserved.\n");
#if 0
static char sccsid[] = "@(#)telnetd.c	8.4 (Berkeley) 5/30/95";
#else
__RCSID("$NetBSD: telnetd.c,v 1.20 2000/01/13 13:11:31 ad Exp $");
#endif
#endif /* not lint */

#include "telnetd.h"
#include "pathnames.h"

#include <arpa/inet.h>

#include <err.h>
#include <termcap.h>

#include <limits.h>

#define P __P

#if	defined(_SC_CRAY_SECURE_SYS) && !defined(SCM_SECURITY)
/*
 * UNICOS 6.0/6.1 do not have SCM_SECURITY defined, so we can
 * use it to tell us to turn off all the socket security code,
 * since that is only used in UNICOS 7.0 and later.
 */
# undef _SC_CRAY_SECURE_SYS
#endif

#if	defined(_SC_CRAY_SECURE_SYS)
#include <sys/sysv.h>
#include <sys/secdev.h>
# ifdef SO_SEC_MULTI		/* 8.0 code */
#include <sys/secparm.h>
#include <sys/usrv.h>
# endif /* SO_SEC_MULTI */
int	secflag;
char	tty_dev[16];
struct	secdev dv;
struct	sysv sysv;
# ifdef SO_SEC_MULTI		/* 8.0 code */
struct	socksec ss;
# else /* SO_SEC_MULTI */	/* 7.0 code */
struct	socket_security ss;
# endif /* SO_SEC_MULTI */
#endif	/* _SC_CRAY_SECURE_SYS */

#if	defined(AUTHENTICATION)
#include <libtelnet/auth.h>
int	auth_level = 0;
#endif
#if	defined(SECURELOGIN)
int	require_secure_login = 0;
#endif

extern	int utmp_len;
int	registerd_host_only = 0;

#ifdef	STREAMSPTY
# include <stropts.h>
# include <termio.h>
/* make sure we don't get the bsd version */
# include "/usr/include/sys/tty.h"
# include <sys/ptyvar.h>

/*
 * Because of the way ptyibuf is used with streams messages, we need
 * ptyibuf+1 to be on a full-word boundary.  The following wierdness
 * is simply to make that happen.
 */
long	ptyibufbuf[BUFSIZ/sizeof(long)+1];
char	*ptyibuf = ((char *)&ptyibufbuf[1])-1;
char	*ptyip = ((char *)&ptyibufbuf[1])-1;
char	ptyibuf2[BUFSIZ*4];
unsigned char ctlbuf[BUFSIZ];
struct	strbuf strbufc, strbufd;

int readstream();

#else	/* ! STREAMPTY */

/*
 * I/O data buffers,
 * pointers, and counters.
 */
char	ptyibuf[BUFSIZ], *ptyip = ptyibuf;
char	ptyibuf2[BUFSIZ];

#endif /* ! STREAMPTY */

int	hostinfo = 1;			/* do we print login banner? */

#ifdef	CRAY
extern int      newmap; /* nonzero if \n maps to ^M^J */
int	lowpty = 0, highpty;	/* low, high pty numbers */
#endif /* CRAY */

int debug = 0;
int keepalive = 1;
char *gettyname = "default";
char *progname;

extern void usage P((void));
int main __P((int, char *[]));
void usage __P((void));
int getterminaltype __P((char *));
int getent __P((char *, char *));
void doit __P((struct sockaddr *));
void _gettermname __P((void));
int terminaltypeok __P((char *));
char *getstr __P((char *, char **));

/*
 * The string to pass to getopt().  We do it this way so
 * that only the actual options that we support will be
 * passed off to getopt().
 */
char valid_opts[] = {
	'd', ':', 'g', ':', 'h', 'k', 'n', 'S', ':', 'u', ':', 'U',
	'4', '6',
#ifdef	AUTHENTICATION
	'a', ':', 'X', ':',
#endif
#ifdef BFTPDAEMON
	'B',
#endif
#ifdef DIAGNOSTICS
	'D', ':',
#endif
#if	defined(CRAY) && defined(NEWINIT)
	'I', ':',
#endif
#ifdef	LINEMODE
	'l',
#endif
#ifdef CRAY
	'r', ':',
#endif
#ifdef	SECURELOGIN
	's',
#endif
	'\0'
};

int family = AF_INET;

int
main(argc, argv)
	int argc;
	char *argv[];
{
	struct sockaddr_storage from;
	int on = 1, fromlen;
	register int ch;
#if	defined(IPPROTO_IP) && defined(IP_TOS)
	int tos = -1;
#endif

	pfrontp = pbackp = ptyobuf;
	netip = netibuf;
	nfrontp = nbackp = netobuf;

	progname = *argv;

#ifdef CRAY
	/*
	 * Get number of pty's before trying to process options,
	 * which may include changing pty range.
	 */
	highpty = getnpty();
#endif /* CRAY */

	while ((ch = getopt(argc, argv, valid_opts)) != -1) {
		switch (ch) {

#ifdef	AUTHENTICATION
		case 'a':
			/*
			 * Check for required authentication level
			 */
			if (strcmp(optarg, "debug") == 0) {
				extern int auth_debug_mode;
				auth_debug_mode = 1;
			} else if (strcasecmp(optarg, "none") == 0) {
				auth_level = 0;
			} else if (strcasecmp(optarg, "other") == 0) {
				auth_level = AUTH_OTHER;
			} else if (strcasecmp(optarg, "user") == 0) {
				auth_level = AUTH_USER;
			} else if (strcasecmp(optarg, "valid") == 0) {
				auth_level = AUTH_VALID;
			} else if (strcasecmp(optarg, "off") == 0) {
				/*
				 * This hack turns off authentication
				 */
				auth_level = -1;
			} else {
				fprintf(stderr,
			    "telnetd: unknown authorization level for -a\n");
			}
			break;
#endif	/* AUTHENTICATION */

#ifdef BFTPDAEMON
		case 'B':
			bftpd++;
			break;
#endif /* BFTPDAEMON */

		case 'd':
			if (strcmp(optarg, "ebug") == 0) {
				debug++;
				break;
			}
			usage();
			/* NOTREACHED */
			break;

#ifdef DIAGNOSTICS
		case 'D':
			/*
			 * Check for desired diagnostics capabilities.
			 */
			if (!strcmp(optarg, "report")) {
				diagnostic |= TD_REPORT|TD_OPTIONS;
			} else if (!strcmp(optarg, "exercise")) {
				diagnostic |= TD_EXERCISE;
			} else if (!strcmp(optarg, "netdata")) {
				diagnostic |= TD_NETDATA;
			} else if (!strcmp(optarg, "ptydata")) {
				diagnostic |= TD_PTYDATA;
			} else if (!strcmp(optarg, "options")) {
				diagnostic |= TD_OPTIONS;
			} else {
				usage();
				/* NOT REACHED */
			}
			break;
#endif /* DIAGNOSTICS */

		case 'g':
			gettyname = optarg;
			break;

		case 'h':
			hostinfo = 0;
			break;

#if	defined(CRAY) && defined(NEWINIT)
		case 'I':
		    {
			extern char *gen_id;
			gen_id = optarg;
			break;
		    }
#endif	/* defined(CRAY) && defined(NEWINIT) */

#ifdef	LINEMODE
		case 'l':
			alwayslinemode = 1;
			break;
#endif	/* LINEMODE */

		case 'k':
#if	defined(LINEMODE) && defined(KLUDGELINEMODE)
			lmodetype = NO_AUTOKLUDGE;
#else
			/* ignore -k option if built without kludge linemode */
#endif	/* defined(LINEMODE) && defined(KLUDGELINEMODE) */
			break;

		case 'n':
			keepalive = 0;
			break;

#ifdef CRAY
		case 'r':
		    {
			char *strchr();
			char *c;

			/*
			 * Allow the specification of alterations
			 * to the pty search range.  It is legal to
			 * specify only one, and not change the
			 * other from its default.
			 */
			c = strchr(optarg, '-');
			if (c) {
				*c++ = '\0';
				highpty = atoi(c);
			}
			if (*optarg != '\0')
				lowpty = atoi(optarg);
			if ((lowpty > highpty) || (lowpty < 0) ||
							(highpty > 32767)) {
				usage();
				/* NOT REACHED */
			}
			break;
		    }
#endif	/* CRAY */

#ifdef	SECURELOGIN
		case 's':
			/* Secure login required */
			require_secure_login = 1;
			break;
#endif	/* SECURELOGIN */
		case 'S':
#ifdef	HAS_GETTOS
			if ((tos = parsetos(optarg, "tcp")) < 0)
				fprintf(stderr, "%s%s%s\n",
					"telnetd: Bad TOS argument '", optarg,
					"'; will try to use default TOS");
#else
			fprintf(stderr, "%s%s\n", "TOS option unavailable; ",
						"-S flag not supported\n");
#endif
			break;

		case 'u':
			utmp_len = atoi(optarg);
			break;

		case 'U':
			registerd_host_only = 1;
			break;

#ifdef	AUTHENTICATION
		case 'X':
			/*
			 * Check for invalid authentication types
			 */
			auth_disable_name(optarg);
			break;
#endif	/* AUTHENTICATION */

		case '4':
			family = AF_INET;
			break;

		case '6':
			family = AF_INET6;
			break;

		default:
			fprintf(stderr, "telnetd: %c: unknown option\n", ch);
			/* FALLTHROUGH */
		case '?':
			usage();
			/* NOTREACHED */
		}
	}

	argc -= optind;
	argv += optind;

	if (debug) {
	    int s, ns, foo, error;
	    char *service = "telnet";
	    struct addrinfo hints, *res;

	    if (argc > 1) {
		usage();
		/* NOT REACHED */
	    } else if (argc == 1)
		service = *argv;

	    memset(&hints, 0, sizeof(hints));
	    hints.ai_flags = AI_PASSIVE;
	    hints.ai_family = family;
	    hints.ai_socktype = SOCK_STREAM;
	    hints.ai_protocol = 0;
	    error = getaddrinfo(NULL, service, &hints, &res);

	    if (error) {
		errx(1, "tcp/%s: %s\n", service, gai_strerror(error));
		usage();
	    }

	    s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
	    if (s < 0) {
		    perror("telnetd: socket");;
		    exit(1);
	    }
	    (void) setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
				(char *)&on, sizeof(on));
	    if (bind(s, res->ai_addr, res->ai_addrlen) < 0) {
		perror("bind");
		exit(1);
	    }
	    if (listen(s, 1) < 0) {
		perror("listen");
		exit(1);
	    }
	    foo = res->ai_addrlen;
	    ns = accept(s, res->ai_addr, &foo);
	    if (ns < 0) {
		perror("accept");
		exit(1);
	    }
	    (void) dup2(ns, 0);
	    (void) close(ns);
	    (void) close(s);
#ifdef convex
	} else if (argc == 1) {
		; /* VOID*/		/* Just ignore the host/port name */
#endif
	} else if (argc > 0) {
		usage();
		/* NOT REACHED */
	}

#if	defined(_SC_CRAY_SECURE_SYS)
	secflag = sysconf(_SC_CRAY_SECURE_SYS);

	/*
	 *	Get socket's security label
	 */
	if (secflag)  {
		int szss = sizeof(ss);
#ifdef SO_SEC_MULTI			/* 8.0 code */
		int sock_multi;
		int szi = sizeof(int);
#endif /* SO_SEC_MULTI */

		memset((char *)&dv, 0, sizeof(dv));

		if (getsysv(&sysv, sizeof(struct sysv)) != 0) {
			perror("getsysv");
			exit(1);
		}

		/*
		 *	Get socket security label and set device values
		 *	   {security label to be set on ttyp device}
		 */
#ifdef SO_SEC_MULTI			/* 8.0 code */
		if ((getsockopt(0, SOL_SOCKET, SO_SECURITY,
			       (char *)&ss, &szss) < 0) ||
		    (getsockopt(0, SOL_SOCKET, SO_SEC_MULTI,
				(char *)&sock_multi, &szi) < 0)) {
			perror("getsockopt");
			exit(1);
		} else {
			dv.dv_actlvl = ss.ss_actlabel.lt_level;
			dv.dv_actcmp = ss.ss_actlabel.lt_compart;
			if (!sock_multi) {
				dv.dv_minlvl = dv.dv_maxlvl = dv.dv_actlvl;
				dv.dv_valcmp = dv.dv_actcmp;
			} else {
				dv.dv_minlvl = ss.ss_minlabel.lt_level;
				dv.dv_maxlvl = ss.ss_maxlabel.lt_level;
				dv.dv_valcmp = ss.ss_maxlabel.lt_compart;
			}
			dv.dv_devflg = 0;
		}
#else /* SO_SEC_MULTI */		/* 7.0 code */
		if (getsockopt(0, SOL_SOCKET, SO_SECURITY,
				(char *)&ss, &szss) >= 0) {
			dv.dv_actlvl = ss.ss_slevel;
			dv.dv_actcmp = ss.ss_compart;
			dv.dv_minlvl = ss.ss_minlvl;
			dv.dv_maxlvl = ss.ss_maxlvl;
			dv.dv_valcmp = ss.ss_maxcmp;
		}
#endif /* SO_SEC_MULTI */
	}
#endif	/* _SC_CRAY_SECURE_SYS */

	openlog("telnetd", LOG_PID | LOG_ODELAY, LOG_DAEMON);
	fromlen = sizeof (from);
	if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0) {
		fprintf(stderr, "%s: ", progname);
		perror("getpeername");
		_exit(1);
	}
	if (keepalive &&
	    setsockopt(0, SOL_SOCKET, SO_KEEPALIVE,
			(char *)&on, sizeof (on)) < 0) {
		syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m");
	}

#if	defined(IPPROTO_IP) && defined(IP_TOS)
	if (((struct sockaddr *)&from)->sa_family == AF_INET) {
# if	defined(HAS_GETTOS)
		struct tosent *tp;
		if (tos < 0 && (tp = gettosbyname("telnet", "tcp")))
			tos = tp->t_tos;
# endif
		if (tos < 0)
			tos = 020;	/* Low Delay bit */
		if (tos
		   && (setsockopt(0, IPPROTO_IP, IP_TOS,
				  (char *)&tos, sizeof(tos)) < 0)
		   && (errno != ENOPROTOOPT) )
			syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
	}
#endif	/* defined(IPPROTO_IP) && defined(IP_TOS) */

	net = 0;
	doit((struct sockaddr *)&from);
	/* NOTREACHED */
#ifdef __GNUC__
	exit(0);
#endif
}  /* end of main */

	void
usage()
{
	fprintf(stderr, "Usage: telnetd");
#ifdef	AUTHENTICATION
	fprintf(stderr, " [-a (debug|other|user|valid|off|none)]\n\t");
#endif
#ifdef BFTPDAEMON
	fprintf(stderr, " [-B]");
#endif
	fprintf(stderr, " [-debug]");
#ifdef DIAGNOSTICS
	fprintf(stderr, " [-D (options|report|exercise|netdata|ptydata)]\n\t");
#endif
#ifdef	AUTHENTICATION
	fprintf(stderr, " [-edebug]");
#endif
	fprintf(stderr, " [-h]");
#if	defined(CRAY) && defined(NEWINIT)
	fprintf(stderr, " [-Iinitid]");
#endif
#if	defined(LINEMODE) && defined(KLUDGELINEMODE)
	fprintf(stderr, " [-k]");
#endif
#ifdef LINEMODE
	fprintf(stderr, " [-l]");
#endif
	fprintf(stderr, " [-n]");
#ifdef	CRAY
	fprintf(stderr, " [-r[lowpty]-[highpty]]");
#endif
	fprintf(stderr, "\n\t");
#ifdef	SECURELOGIN
	fprintf(stderr, " [-s]");
#endif
#ifdef	HAS_GETTOS
	fprintf(stderr, " [-S tos]");
#endif
#ifdef	AUTHENTICATION
	fprintf(stderr, " [-X auth-type]");
#endif
	fprintf(stderr, " [-u utmp_hostname_length] [-U]");
	fprintf(stderr, " [port]\n");
	exit(1);
}

/*
 * getterminaltype
 *
 *	Ask the other end to send along its terminal type and speed.
 * Output is the variable terminaltype filled in.
 */
static unsigned char ttytype_sbbuf[] = {
	IAC, SB, TELOPT_TTYPE, TELQUAL_SEND, IAC, SE
};

    int
getterminaltype(name)
    char *name;
{
    int retval = -1;

    settimer(baseline);
#if	defined(AUTHENTICATION)
    /*
     * Handle the Authentication option before we do anything else.
     */
    send_do(TELOPT_AUTHENTICATION, 1);
    while (his_will_wont_is_changing(TELOPT_AUTHENTICATION))
	ttloop();
    if (his_state_is_will(TELOPT_AUTHENTICATION)) {
	retval = auth_wait(name);
    }
#endif

    send_do(TELOPT_TTYPE, 1);
    send_do(TELOPT_TSPEED, 1);
    send_do(TELOPT_XDISPLOC, 1);
    send_do(TELOPT_NEW_ENVIRON, 1);
    send_do(TELOPT_OLD_ENVIRON, 1);
    while (
	   his_will_wont_is_changing(TELOPT_TTYPE) ||
	   his_will_wont_is_changing(TELOPT_TSPEED) ||
	   his_will_wont_is_changing(TELOPT_XDISPLOC) ||
	   his_will_wont_is_changing(TELOPT_NEW_ENVIRON) ||
	   his_will_wont_is_changing(TELOPT_OLD_ENVIRON)) {
	ttloop();
    }
    if (his_state_is_will(TELOPT_TSPEED)) {
	static unsigned char sb[] =
			{ IAC, SB, TELOPT_TSPEED, TELQUAL_SEND, IAC, SE };

	memmove(nfrontp, sb, sizeof sb);
	nfrontp += sizeof sb;
	DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2););
    }
    if (his_state_is_will(TELOPT_XDISPLOC)) {
	static unsigned char sb[] =
			{ IAC, SB, TELOPT_XDISPLOC, TELQUAL_SEND, IAC, SE };

	memmove(nfrontp, sb, sizeof sb);
	nfrontp += sizeof sb;
	DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2););
    }
    if (his_state_is_will(TELOPT_NEW_ENVIRON)) {
	static unsigned char sb[] =
			{ IAC, SB, TELOPT_NEW_ENVIRON, TELQUAL_SEND, IAC, SE };

	memmove(nfrontp, sb, sizeof sb);
	nfrontp += sizeof sb;
	DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2););
    }
    else if (his_state_is_will(TELOPT_OLD_ENVIRON)) {
	static unsigned char sb[] =
			{ IAC, SB, TELOPT_OLD_ENVIRON, TELQUAL_SEND, IAC, SE };

	memmove(nfrontp, sb, sizeof sb);
	nfrontp += sizeof sb;
	DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2););
    }
    if (his_state_is_will(TELOPT_TTYPE)) {

	memmove(nfrontp, ttytype_sbbuf, sizeof ttytype_sbbuf);
	nfrontp += sizeof ttytype_sbbuf;
	DIAG(TD_OPTIONS, printsub('>', ttytype_sbbuf + 2,
					sizeof ttytype_sbbuf - 2););
    }
    if (his_state_is_will(TELOPT_TSPEED)) {
	while (sequenceIs(tspeedsubopt, baseline))
	    ttloop();
    }
    if (his_state_is_will(TELOPT_XDISPLOC)) {
	while (sequenceIs(xdisplocsubopt, baseline))
	    ttloop();
    }
    if (his_state_is_will(TELOPT_NEW_ENVIRON)) {
	while (sequenceIs(environsubopt, baseline))
	    ttloop();
    }
    if (his_state_is_will(TELOPT_OLD_ENVIRON)) {
	while (sequenceIs(oenvironsubopt, baseline))
	    ttloop();
    }
    if (his_state_is_will(TELOPT_TTYPE)) {
	char first[256], last[256];

	while (sequenceIs(ttypesubopt, baseline))
	    ttloop();

	/*
	 * If the other side has already disabled the option, then
	 * we have to just go with what we (might) have already gotten.
	 */
	if (his_state_is_will(TELOPT_TTYPE) && !terminaltypeok(terminaltype)) {
	    (void) strncpy(first, terminaltype, sizeof(first));
	    for(;;) {
		/*
		 * Save the unknown name, and request the next name.
		 */
		(void) strncpy(last, terminaltype, sizeof(last));
		_gettermname();
		if (terminaltypeok(terminaltype))
		    break;
		if ((strncmp(last, terminaltype, sizeof(last)) == 0) ||
		    his_state_is_wont(TELOPT_TTYPE)) {
		    /*
		     * We've hit the end.  If this is the same as
		     * the first name, just go with it.
		     */
		    if (strncmp(first, terminaltype, sizeof(first)) == 0)
			break;
		    /*
		     * Get the terminal name one more time, so that
		     * RFC1091 compliant telnets will cycle back to
		     * the start of the list.
		     */
		     _gettermname();
		    if (strncmp(first, terminaltype, sizeof(first)) != 0)
			(void) strncpy(terminaltype, first, sizeof(first));
		    break;
		}
	    }
	}
    }
    return(retval);
}  /* end of getterminaltype */

    void
_gettermname()
{
    /*
     * If the client turned off the option,
     * we can't send another request, so we
     * just return.
     */
    if (his_state_is_wont(TELOPT_TTYPE))
	return;
    settimer(baseline);
    memmove(nfrontp, ttytype_sbbuf, sizeof ttytype_sbbuf);
    nfrontp += sizeof ttytype_sbbuf;
    DIAG(TD_OPTIONS, printsub('>', ttytype_sbbuf + 2,
					sizeof ttytype_sbbuf - 2););
    while (sequenceIs(ttypesubopt, baseline))
	ttloop();
}

    int
terminaltypeok(s)
    char *s;
{
    char buf[1024];

    if (terminaltype == NULL)
	return(1);

    /*
     * tgetent() will return 1 if the type is known, and
     * 0 if it is not known.  If it returns -1, it couldn't
     * open the database.  But if we can't open the database,
     * it won't help to say we failed, because we won't be
     * able to verify anything else.  So, we treat -1 like 1.
     */
    if (tgetent(buf, s) == 0)
	return(0);
    return(1);
}

#ifndef	MAXHOSTNAMELEN
#define	MAXHOSTNAMELEN 64
#endif	/* MAXHOSTNAMELEN */

char *hostname;
char host_name[MAXHOSTNAMELEN + 1];
char remote_host_name[MAXHOSTNAMELEN + 1];

#ifndef	convex
extern void telnet P((int, int));
#else
extern void telnet P((int, int, char *));
#endif

/*
 * Get a pty, scan input lines.
 */
void
doit(who)
	struct sockaddr *who;
{
	char *host;
	int error;
	int level;
	int ptynum;
	char user_name[256];

	/*
	 * Find an available pty to use.
	 */
#ifndef	convex
	pty = getpty(&ptynum);
	if (pty < 0)
		fatal(net, "All network ports in use");
#else
	for (;;) {
		char *lp;
		extern char *line;

		if ((lp = getpty()) == NULL)
			fatal(net, "Out of ptys");

		if ((pty = open(lp, 2)) >= 0) {
			strcpy(line,lp);
			line[5] = 't';
			break;
		}
	}
#endif

#if	defined(_SC_CRAY_SECURE_SYS)
	/*
	 *	set ttyp line security label
	 */
	if (secflag) {
		char slave_dev[16];

		sprintf(tty_dev, "/dev/pty/%03d", ptynum);
		if (setdevs(tty_dev, &dv) < 0)
		 	fatal(net, "cannot set pty security");
		sprintf(slave_dev, "/dev/ttyp%03d", ptynum);
		if (setdevs(slave_dev, &dv) < 0)
		 	fatal(net, "cannot set tty security");
	}
#endif	/* _SC_CRAY_SECURE_SYS */

	/* get name of connected client */
	error = getnameinfo(who, who->sa_len, remote_host_name,
			    sizeof(remote_host_name), NULL, 0, 0);

	if (error) {
		fatal(net, "Couldn't resolve your address into a host name.\r\n\
	 Please contact your net administrator");
#ifdef __GNUC__
		host = NULL;	/* XXX gcc */
#endif
	}

	remote_host_name[sizeof(remote_host_name)-1] = 0;
	host = remote_host_name;

	(void)gethostname(host_name, sizeof (host_name));
	host_name[sizeof(host_name) - 1] = '\0';
	hostname = host_name;

#if	defined(AUTHENTICATION)
	auth_encrypt_init(hostname, host, "TELNETD", 1);
#endif

	init_env();
	/*
	 * get terminal type.
	 */
	*user_name = 0;
	level = getterminaltype(user_name);
	setenv("TERM", terminaltype ? terminaltype : "network", 1);

	/*
	 * Start up the login process on the slave side of the terminal
	 */
#ifndef	convex
	startslave(host, level, user_name);

#if	defined(_SC_CRAY_SECURE_SYS)
	if (secflag) {
		if (setulvl(dv.dv_actlvl) < 0)
			fatal(net,"cannot setulvl()");
		if (setucmp(dv.dv_actcmp) < 0)
			fatal(net, "cannot setucmp()");
	}
#endif	/* _SC_CRAY_SECURE_SYS */

	telnet(net, pty);  /* begin server processing */
#else
	telnet(net, pty, host);
#endif
	/*NOTREACHED*/
}  /* end of doit */

#if	defined(CRAY2) && defined(UNICOS5) && defined(UNICOS50)
	int
Xterm_output(ibufp, obuf, icountp, ocount)
	char **ibufp, *obuf;
	int *icountp, ocount;
{
	int ret;
	ret = term_output(*ibufp, obuf, *icountp, ocount);
	*ibufp += *icountp;
	*icountp = 0;
	return(ret);
}
#define	term_output	Xterm_output
#endif	/* defined(CRAY2) && defined(UNICOS5) && defined(UNICOS50) */

/*
 * Main loop.  Select from pty and network, and
 * hand data to telnet receiver finite state machine.
 */
	void
#ifndef	convex
telnet(f, p)
#else
telnet(f, p, host)
#endif
	int f, p;
#ifdef convex
	char *host;
#endif
{
	int on = 1;
#define	TABBUFSIZ	512
	char	defent[TABBUFSIZ];
	char	defstrs[TABBUFSIZ];
#undef	TABBUFSIZ
	char *HE, *HN, *IM, *IF, *ptyibuf2ptr;
	int nfd;

	/*
	 * Initialize the slc mapping table.
	 */
	get_slc_defaults();

	/*
	 * Do some tests where it is desireable to wait for a response.
	 * Rather than doing them slowly, one at a time, do them all
	 * at once.
	 */
	if (my_state_is_wont(TELOPT_SGA))
		send_will(TELOPT_SGA, 1);
	/*
	 * Is the client side a 4.2 (NOT 4.3) system?  We need to know this
	 * because 4.2 clients are unable to deal with TCP urgent data.
	 *
	 * To find out, we send out a "DO ECHO".  If the remote system
	 * answers "WILL ECHO" it is probably a 4.2 client, and we note
	 * that fact ("WILL ECHO" ==> that the client will echo what
	 * WE, the server, sends it; it does NOT mean that the client will
	 * echo the terminal input).
	 */
	send_do(TELOPT_ECHO, 1);

#ifdef	LINEMODE
	if (his_state_is_wont(TELOPT_LINEMODE)) {
		/* Query the peer for linemode support by trying to negotiate
		 * the linemode option.
		 */
		linemode = 0;
		editmode = 0;
		send_do(TELOPT_LINEMODE, 1);  /* send do linemode */
	}
#endif	/* LINEMODE */

	/*
	 * Send along a couple of other options that we wish to negotiate.
	 */
	send_do(TELOPT_NAWS, 1);
	send_will(TELOPT_STATUS, 1);
	flowmode = 1;		/* default flow control state */
	restartany = -1;	/* uninitialized... */
	send_do(TELOPT_LFLOW, 1);

	/*
	 * Spin, waiting for a response from the DO ECHO.  However,
	 * some REALLY DUMB telnets out there might not respond
	 * to the DO ECHO.  So, we spin looking for NAWS, (most dumb
	 * telnets so far seem to respond with WONT for a DO that
	 * they don't understand...) because by the time we get the
	 * response, it will already have processed the DO ECHO.
	 * Kludge upon kludge.
	 */
	while (his_will_wont_is_changing(TELOPT_NAWS))
		ttloop();

	/*
	 * But...
	 * The client might have sent a WILL NAWS as part of its
	 * startup code; if so, we'll be here before we get the
	 * response to the DO ECHO.  We'll make the assumption
	 * that any implementation that understands about NAWS
	 * is a modern enough implementation that it will respond
	 * to our DO ECHO request; hence we'll do another spin
	 * waiting for the ECHO option to settle down, which is
	 * what we wanted to do in the first place...
	 */
	if (his_want_state_is_will(TELOPT_ECHO) &&
	    his_state_is_will(TELOPT_NAWS)) {
		while (his_will_wont_is_changing(TELOPT_ECHO))
			ttloop();
	}
	/*
	 * On the off chance that the telnet client is broken and does not
	 * respond to the DO ECHO we sent, (after all, we did send the
	 * DO NAWS negotiation after the DO ECHO, and we won't get here
	 * until a response to the DO NAWS comes back) simulate the
	 * receipt of a will echo.  This will also send a WONT ECHO
	 * to the client, since we assume that the client failed to
	 * respond because it believes that it is already in DO ECHO
	 * mode, which we do not want.
	 */
	if (his_want_state_is_will(TELOPT_ECHO)) {
		DIAG(TD_OPTIONS,
			{sprintf(nfrontp, "td: simulating recv\r\n");
			 nfrontp += strlen(nfrontp);});
		willoption(TELOPT_ECHO);
	}

	/*
	 * Finally, to clean things up, we turn on our echo.  This
	 * will break stupid 4.2 telnets out of local terminal echo.
	 */

	if (my_state_is_wont(TELOPT_ECHO))
		send_will(TELOPT_ECHO, 1);

#ifndef	STREAMSPTY
	/*
	 * Turn on packet mode
	 */
	(void) ioctl(p, TIOCPKT, (char *)&on);
#endif

#if	defined(LINEMODE) && defined(KLUDGELINEMODE)
	/*
	 * Continuing line mode support.  If client does not support
	 * real linemode, attempt to negotiate kludge linemode by sending
	 * the do timing mark sequence.
	 */
	if (lmodetype < REAL_LINEMODE)
		send_do(TELOPT_TM, 1);
#endif	/* defined(LINEMODE) && defined(KLUDGELINEMODE) */

	/*
	 * Call telrcv() once to pick up anything received during
	 * terminal type negotiation, 4.2/4.3 determination, and
	 * linemode negotiation.
	 */
	telrcv();

	(void) ioctl(f, FIONBIO, (char *)&on);
	(void) ioctl(p, FIONBIO, (char *)&on);
#if	defined(CRAY2) && defined(UNICOS5)
	init_termdriver(f, p, interrupt, sendbrk);
#endif

#if	defined(SO_OOBINLINE)
	(void) setsockopt(net, SOL_SOCKET, SO_OOBINLINE,
				(char *)&on, sizeof on);
#endif	/* defined(SO_OOBINLINE) */

#ifdef	SIGTSTP
	(void) signal(SIGTSTP, SIG_IGN);
#endif
#ifdef	SIGTTOU
	/*
	 * Ignoring SIGTTOU keeps the kernel from blocking us
	 * in ttioct() in /sys/tty.c.
	 */
	(void) signal(SIGTTOU, SIG_IGN);
#endif

	(void) signal(SIGCHLD, cleanup);

#if	defined(CRAY2) && defined(UNICOS5)
	/*
	 * Cray-2 will send a signal when pty modes are changed by slave
	 * side.  Set up signal handler now.
	 */
	if ((int)signal(SIGUSR1, termstat) < 0)
		perror("signal");
	else if (ioctl(p, TCSIGME, (char *)SIGUSR1) < 0)
		perror("ioctl:TCSIGME");
	/*
	 * Make processing loop check terminal characteristics early on.
	 */
	termstat();
#endif

#ifdef  TIOCNOTTY
	{
		register int t;
		t = open(_PATH_TTY, O_RDWR);
		if (t >= 0) {
			(void) ioctl(t, TIOCNOTTY, (char *)0);
			(void) close(t);
		}
	}
#endif

#if	defined(CRAY) && defined(NEWINIT) && defined(TIOCSCTTY)
	(void) setsid();
	ioctl(p, TIOCSCTTY, 0);
#endif

	/*
	 * Show banner that getty never gave.
	 *
	 * We put the banner in the pty input buffer.  This way, it
	 * gets carriage return null processing, etc., just like all
	 * other pty --> client data.
	 */

#if	!defined(CRAY) || !defined(NEWINIT)
	if (getenv("USER"))
		hostinfo = 0;
#endif

	if (getent(defent, gettyname) == 1) {
		char *cp=defstrs;

		HE = getstr("he", &cp);
		HN = getstr("hn", &cp);
		IM = getstr("im", &cp);
		IF = getstr("if", &cp);
		if (HN && *HN)
			(void) strcpy(host_name, HN);
		if (IM == 0)
			IM = "";
	} else {
		IM = DEFAULT_IM;
		HE = 0;
	}
	edithost(HE, host_name);
	ptyibuf2ptr = ptyibuf2;
	if (hostinfo) {
		if (IF)	{
			char buf[_POSIX2_LINE_MAX];
			FILE *fd;

			if ((fd = fopen(IF, "r")) != NULL) {
				while (fgets(buf, sizeof(buf) - 1, fd) != NULL)
					ptyibuf2ptr = putf(buf, ptyibuf2ptr);
				fclose(fd);
			}
		}
		if (*IM)
			ptyibuf2ptr = putf(IM, ptyibuf2ptr);
	}

	if (pcc)
		strncpy(ptyibuf2ptr, ptyip, pcc+1);
	ptyip = ptyibuf2;
	pcc = strlen(ptyip);
#ifdef	LINEMODE
	/*
	 * Last check to make sure all our states are correct.
	 */
	init_termbuf();
	localstat();
#endif	/* LINEMODE */

	DIAG(TD_REPORT,
		{sprintf(nfrontp, "td: Entering processing loop\r\n");
		 nfrontp += strlen(nfrontp);});

#ifdef	convex
	startslave(host);
#endif

	nfd = ((f > p) ? f : p) + 1;
	for (;;) {
		fd_set ibits, obits, xbits;
		register int c;

		if (ncc < 0 && pcc < 0)
			break;

#if	defined(CRAY2) && defined(UNICOS5)
		if (needtermstat)
			_termstat();
#endif	/* defined(CRAY2) && defined(UNICOS5) */
		FD_ZERO(&ibits);
		FD_ZERO(&obits);
		FD_ZERO(&xbits);
		/*
		 * Never look for input if there's still
		 * stuff in the corresponding output buffer
		 */
		if (nfrontp - nbackp || pcc > 0) {
			FD_SET(f, &obits);
		} else {
			FD_SET(p, &ibits);
		}
		if (pfrontp - pbackp || ncc > 0) {
			FD_SET(p, &obits);
		} else {
			FD_SET(f, &ibits);
		}
		if (!SYNCHing) {
			FD_SET(f, &xbits);
		}
		if ((c = select(nfd, &ibits, &obits, &xbits,
						(struct timeval *)0)) < 1) {
			if (c == -1) {
				if (errno == EINTR) {
					continue;
				}
			}
			sleep(5);
			continue;
		}

		/*
		 * Any urgent data?
		 */
		if (FD_ISSET(net, &xbits)) {
		    SYNCHing = 1;
		}

		/*
		 * Something to read from the network...
		 */
		if (FD_ISSET(net, &ibits)) {
#if	!defined(SO_OOBINLINE)
			/*
			 * In 4.2 (and 4.3 beta) systems, the
			 * OOB indication and data handling in the kernel
			 * is such that if two separate TCP Urgent requests
			 * come in, one byte of TCP data will be overlaid.
			 * This is fatal for Telnet, but we try to live
			 * with it.
			 *
			 * In addition, in 4.2 (and...), a special protocol
			 * is needed to pick up the TCP Urgent data in
			 * the correct sequence.
			 *
			 * What we do is:  if we think we are in urgent
			 * mode, we look to see if we are "at the mark".
			 * If we are, we do an OOB receive.  If we run
			 * this twice, we will do the OOB receive twice,
			 * but the second will fail, since the second
			 * time we were "at the mark", but there wasn't
			 * any data there (the kernel doesn't reset
			 * "at the mark" until we do a normal read).
			 * Once we've read the OOB data, we go ahead
			 * and do normal reads.
			 *
			 * There is also another problem, which is that
			 * since the OOB byte we read doesn't put us
			 * out of OOB state, and since that byte is most
			 * likely the TELNET DM (data mark), we would
			 * stay in the TELNET SYNCH (SYNCHing) state.
			 * So, clocks to the rescue.  If we've "just"
			 * received a DM, then we test for the
			 * presence of OOB data when the receive OOB
			 * fails (and AFTER we did the normal mode read
			 * to clear "at the mark").
			 */
		    if (SYNCHing) {
			int atmark;

			(void) ioctl(net, SIOCATMARK, (char *)&atmark);
			if (atmark) {
			    ncc = recv(net, netibuf, sizeof (netibuf), MSG_OOB);
			    if ((ncc == -1) && (errno == EINVAL)) {
				ncc = read(net, netibuf, sizeof (netibuf));
				if (sequenceIs(didnetreceive, gotDM)) {
				    SYNCHing = stilloob(net);
				}
			    }
			} else {
			    ncc = read(net, netibuf, sizeof (netibuf));
			}
		    } else {
			ncc = read(net, netibuf, sizeof (netibuf));
		    }
		    settimer(didnetreceive);
#else	/* !defined(SO_OOBINLINE)) */
		    ncc = read(net, netibuf, sizeof (netibuf));
#endif	/* !defined(SO_OOBINLINE)) */
		    if (ncc < 0 && errno == EWOULDBLOCK)
			ncc = 0;
		    else {
			if (ncc <= 0) {
			    break;
			}
			netip = netibuf;
		    }
		    DIAG((TD_REPORT | TD_NETDATA),
			    {sprintf(nfrontp, "td: netread %d chars\r\n", ncc);
			     nfrontp += strlen(nfrontp);});
		    DIAG(TD_NETDATA, printdata("nd", netip, ncc));
		}

		/*
		 * Something to read from the pty...
		 */
		if (FD_ISSET(p, &ibits)) {
#ifndef	STREAMSPTY
			pcc = read(p, ptyibuf, BUFSIZ);
#else
			pcc = readstream(p, ptyibuf, BUFSIZ);
#endif
			/*
			 * On some systems, if we try to read something
			 * off the master side before the slave side is
			 * opened, we get EIO.
			 */
			if (pcc < 0 && (errno == EWOULDBLOCK ||
#ifdef	EAGAIN
					errno == EAGAIN ||
#endif
					errno == EIO)) {
				pcc = 0;
			} else {
				if (pcc <= 0)
					break;
#if	!defined(CRAY2) || !defined(UNICOS5)
#ifdef	LINEMODE
				/*
				 * If ioctl from pty, pass it through net
				 */
				if (ptyibuf[0] & TIOCPKT_IOCTL) {
					copy_termbuf(ptyibuf+1, pcc-1);
					localstat();
					pcc = 1;
				}
#endif	/* LINEMODE */
				if (ptyibuf[0] & TIOCPKT_FLUSHWRITE) {
					netclear();	/* clear buffer back */
#ifndef	NO_URGENT
					/*
					 * There are client telnets on some
					 * operating systems get screwed up
					 * royally if we send them urgent
					 * mode data.
					 */
					*nfrontp++ = IAC;
					*nfrontp++ = DM;
					neturg = nfrontp-1; /* off by one XXX */
					DIAG(TD_OPTIONS,
					    printoption("td: send IAC", DM));

#endif
				}
				if (his_state_is_will(TELOPT_LFLOW) &&
				    (ptyibuf[0] &
				     (TIOCPKT_NOSTOP|TIOCPKT_DOSTOP))) {
					int newflow =
					    ptyibuf[0] & TIOCPKT_DOSTOP ? 1 : 0;
					if (newflow != flowmode) {
						flowmode = newflow;
						(void) sprintf(nfrontp,
							"%c%c%c%c%c%c",
							IAC, SB, TELOPT_LFLOW,
							flowmode ? LFLOW_ON
								 : LFLOW_OFF,
							IAC, SE);
						nfrontp += 6;
						DIAG(TD_OPTIONS, printsub('>',
						    (unsigned char *)nfrontp-4,
						    4););
					}
				}
				pcc--;
				ptyip = ptyibuf+1;
#else	/* defined(CRAY2) && defined(UNICOS5) */
				if (!uselinemode) {
					unpcc = pcc;
					unptyip = ptyibuf;
					pcc = term_output(&unptyip, ptyibuf2,
								&unpcc, BUFSIZ);
					ptyip = ptyibuf2;
				} else
					ptyip = ptyibuf;
#endif	/* defined(CRAY2) && defined(UNICOS5) */
			}
		}

		while (pcc > 0) {
			if ((&netobuf[BUFSIZ] - nfrontp) < 2)
				break;
			c = *ptyip++ & 0377, pcc--;
			if (c == IAC)
				*nfrontp++ = c;
#if	defined(CRAY2) && defined(UNICOS5)
			else if (c == '\n' &&
				     my_state_is_wont(TELOPT_BINARY) && newmap)
				*nfrontp++ = '\r';
#endif	/* defined(CRAY2) && defined(UNICOS5) */
			*nfrontp++ = c;
			if ((c == '\r') && (my_state_is_wont(TELOPT_BINARY))) {
				if (pcc > 0 && ((*ptyip & 0377) == '\n')) {
					*nfrontp++ = *ptyip++ & 0377;
					pcc--;
				} else
					*nfrontp++ = '\0';
			}
		}
#if	defined(CRAY2) && defined(UNICOS5)
		/*
		 * If chars were left over from the terminal driver,
		 * note their existence.
		 */
		if (!uselinemode && unpcc) {
			pcc = unpcc;
			unpcc = 0;
			ptyip = unptyip;
		}
#endif	/* defined(CRAY2) && defined(UNICOS5) */

		if (FD_ISSET(f, &obits) && (nfrontp - nbackp) > 0)
			netflush();
		if (ncc > 0)
			telrcv();
		if (FD_ISSET(p, &obits) && (pfrontp - pbackp) > 0)
			ptyflush();
	}
	cleanup(0);
}  /* end of telnet */

#ifndef	TCSIG
# ifdef	TIOCSIG
#  define TCSIG TIOCSIG
# endif
#endif

#ifdef	STREAMSPTY

int flowison = -1;  /* current state of flow: -1 is unknown */

int readstream(p, ibuf, bufsize)
	int p;
	char *ibuf;
	int bufsize;
{
	int flags = 0;
	int ret = 0;
	struct termios *tsp;
	struct termio *tp;
	struct iocblk *ip;
	char vstop, vstart;
	int ixon;
	int newflow;

	strbufc.maxlen = BUFSIZ;
	strbufc.buf = (char *)ctlbuf;
	strbufd.maxlen = bufsize-1;
	strbufd.len = 0;
	strbufd.buf = ibuf+1;
	ibuf[0] = 0;

	ret = getmsg(p, &strbufc, &strbufd, &flags);
	if (ret < 0)  /* error of some sort -- probably EAGAIN */
		return(-1);

	if (strbufc.len <= 0 || ctlbuf[0] == M_DATA) {
		/* data message */
		if (strbufd.len > 0) {			/* real data */
			return(strbufd.len + 1);	/* count header char */
		} else {
			/* nothing there */
			errno = EAGAIN;
			return(-1);
		}
	}

	/*
	 * It's a control message.  Return 1, to look at the flag we set
	 */

	switch (ctlbuf[0]) {
	case M_FLUSH:
		if (ibuf[1] & FLUSHW)
			ibuf[0] = TIOCPKT_FLUSHWRITE;
		return(1);

	case M_IOCTL:
		ip = (struct iocblk *) (ibuf+1);

		switch (ip->ioc_cmd) {
		case TCSETS:
		case TCSETSW:
		case TCSETSF:
			tsp = (struct termios *)
					(ibuf+1 + sizeof(struct iocblk));
			vstop = tsp->c_cc[VSTOP];
			vstart = tsp->c_cc[VSTART];
			ixon = tsp->c_iflag & IXON;
			break;
		case TCSETA:
		case TCSETAW:
		case TCSETAF:
			tp = (struct termio *) (ibuf+1 + sizeof(struct iocblk));
			vstop = tp->c_cc[VSTOP];
			vstart = tp->c_cc[VSTART];
			ixon = tp->c_iflag & IXON;
			break;
		default:
			errno = EAGAIN;
			return(-1);
		}

		newflow =  (ixon && (vstart == 021) && (vstop == 023)) ? 1 : 0;
		if (newflow != flowison) {  /* it's a change */
			flowison = newflow;
			ibuf[0] = newflow ? TIOCPKT_DOSTOP : TIOCPKT_NOSTOP;
			return(1);
		}
	}

	/* nothing worth doing anything about */
	errno = EAGAIN;
	return(-1);
}
#endif /* STREAMSPTY */

/*
 * Send interrupt to process on other side of pty.
 * If it is in raw mode, just write NULL;
 * otherwise, write intr char.
 */
	void
interrupt()
{
	ptyflush();	/* half-hearted */

#if defined(STREAMSPTY) && defined(TIOCSIGNAL)
	/* Streams PTY style ioctl to post a signal */
	{
		int sig = SIGINT;
		(void) ioctl(pty, TIOCSIGNAL, &sig);
		(void) ioctl(pty, I_FLUSH, FLUSHR);
	}
#else
#ifdef	TCSIG
	(void) ioctl(pty, TCSIG, (char *)SIGINT);
#else	/* TCSIG */
	init_termbuf();
	*pfrontp++ = slctab[SLC_IP].sptr ?
			(unsigned char)*slctab[SLC_IP].sptr : '\177';
#endif	/* TCSIG */
#endif
}

/*
 * Send quit to process on other side of pty.
 * If it is in raw mode, just write NULL;
 * otherwise, write quit char.
 */
	void
sendbrk()
{
	ptyflush();	/* half-hearted */
#ifdef	TCSIG
	(void) ioctl(pty, TCSIG, (char *)SIGQUIT);
#else	/* TCSIG */
	init_termbuf();
	*pfrontp++ = slctab[SLC_ABORT].sptr ?
			(unsigned char)*slctab[SLC_ABORT].sptr : '\034';
#endif	/* TCSIG */
}

	void
sendsusp()
{
#ifdef	SIGTSTP
	ptyflush();	/* half-hearted */
# ifdef	TCSIG
	(void) ioctl(pty, TCSIG, (char *)SIGTSTP);
# else	/* TCSIG */
	*pfrontp++ = slctab[SLC_SUSP].sptr ?
			(unsigned char)*slctab[SLC_SUSP].sptr : '\032';
# endif	/* TCSIG */
#endif	/* SIGTSTP */
}

/*
 * When we get an AYT, if ^T is enabled, use that.  Otherwise,
 * just send back "[Yes]".
 */
	void
recv_ayt()
{
#if	defined(SIGINFO) && defined(TCSIG)
	if (slctab[SLC_AYT].sptr && *slctab[SLC_AYT].sptr != _POSIX_VDISABLE) {
		(void) ioctl(pty, TCSIG, (char *)SIGINFO);
		return;
	}
#endif
	(void) strcpy(nfrontp, "\r\n[Yes]\r\n");
	nfrontp += 9;
}

	void
doeof()
{
	init_termbuf();

#if	defined(LINEMODE) && defined(USE_TERMIO) && (VEOF == VMIN)
	if (!tty_isediting()) {
		extern char oldeofc;
		*pfrontp++ = oldeofc;
		return;
	}
#endif
	*pfrontp++ = slctab[SLC_EOF].sptr ?
			(unsigned char)*slctab[SLC_EOF].sptr : '\004';
}