Secure telnet is now in eBones.

1 files changed, 0 insertions, 1598 deletions

diff --git a/secure/libexec/telnetd/telnetd.c b/secure/libexec/telnetd/telnetd.c
deleted file mode 100644
index 40fdad5..0000000
--- a/secure/libexec/telnetd/telnetd.c
+++ /dev/null
@@ -1,1598 +0,0 @@
-/*
- * 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.
- */
-
-#ifndef lint
-static char copyright[] =
-"@(#) Copyright (c) 1989, 1993\n\
-	The Regents of the University of California.  All rights reserved.\n";
-#endif /* not lint */
-
-#ifndef lint
-static char sccsid[] = "@(#)telnetd.c	8.4 (Berkeley) 5/30/95";
-#endif /* not lint */
-
-#include "telnetd.h"
-#include "pathnames.h"
-
-#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(SecurID)
-int	require_SecurID = 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];
-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 *progname;
-char *altlogin;
-
-extern void usage P((void));
-
-/*
- * 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', ':', 'h', 'k', 'n', 'p', ':', 'S', ':', 'u', ':', 'U',
-#ifdef	AUTHENTICATION
-	'a', ':', 'X', ':',
-#endif
-#ifdef BFTPDAEMON
-	'B',
-#endif
-#ifdef DIAGNOSTICS
-	'D', ':',
-#endif
-#ifdef	ENCRYPTION
-	'e', ':',
-#endif
-#if	defined(CRAY) && defined(NEWINIT)
-	'I', ':',
-#endif
-#ifdef	LINEMODE
-	'l',
-#endif
-#ifdef CRAY
-	'r', ':',
-#endif
-#ifdef	SecurID
-	's',
-#endif
-	'\0'
-};
-
-main(argc, argv)
-	char *argv[];
-{
-	struct sockaddr_in from;
-	int on = 1, fromlen;
-	register int ch;
-	extern char *optarg;
-	extern int optind;
-#if	defined(IPPROTO_IP) && defined(IP_TOS)
-	int tos = -1;
-#endif
-
-	pfrontp = pbackp = ptyobuf;
-	netip = netibuf;
-	nfrontp = nbackp = netobuf;
-#ifdef	ENCRYPTION
-	nclearto = 0;
-#endif	/* ENCRYPTION */
-
-	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)) != EOF) {
-		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 */
-
-#ifdef	ENCRYPTION
-		case 'e':
-			if (strcmp(optarg, "debug") == 0) {
-				extern int encrypt_debug_mode;
-				encrypt_debug_mode = 1;
-				break;
-			}
-			usage();
-			/* NOTREACHED */
-			break;
-#endif	/* ENCRYPTION */
-
-		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;
-
-		case 'p':
-			altlogin = optarg;
-			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	SecurID
-		case 's':
-			/* SecurID required */
-			require_SecurID = 1;
-			break;
-#endif	/* SecurID */
-		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 */
-
-		default:
-			fprintf(stderr, "telnetd: %c: unknown option\n", ch);
-			/* FALLTHROUGH */
-		case '?':
-			usage();
-			/* NOTREACHED */
-		}
-	}
-
-	argc -= optind;
-	argv += optind;
-
-	if (debug) {
-	    int s, ns, foo;
-	    struct servent *sp;
-	    static struct sockaddr_in sin = { AF_INET };
-
-	    if (argc > 1) {
-		usage();
-		/* NOT REACHED */
-	    } else if (argc == 1) {
-		    if (sp = getservbyname(*argv, "tcp")) {
-			sin.sin_port = sp->s_port;
-		    } else {
-			sin.sin_port = atoi(*argv);
-			if ((int)sin.sin_port <= 0) {
-			    fprintf(stderr, "telnetd: %s: bad port #\n", *argv);
-			    usage();
-			    /* NOT REACHED */
-			}
-			sin.sin_port = htons((u_short)sin.sin_port);
-		   }
-	    } else {
-		sp = getservbyname("telnet", "tcp");
-		if (sp == 0) {
-		    fprintf(stderr, "telnetd: tcp/telnet: unknown service\n");
-		    exit(1);
-		}
-		sin.sin_port = sp->s_port;
-	    }
-
-	    s = socket(AF_INET, SOCK_STREAM, 0);
-	    if (s < 0) {
-		    perror("telnetd: socket");;
-		    exit(1);
-	    }
-	    (void) setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
-				(char *)&on, sizeof(on));
-	    if (bind(s, (struct sockaddr *)&sin, sizeof sin) < 0) {
-		perror("bind");
-		exit(1);
-	    }
-	    if (listen(s, 1) < 0) {
-		perror("listen");
-		exit(1);
-	    }
-	    foo = sizeof sin;
-	    ns = accept(s, (struct sockaddr *)&sin, &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	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(&from);
-	/* NOTREACHED */
-}  /* 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	SecurID
-	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;
-    void _gettermname();
-
-    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
-
-#ifdef	ENCRYPTION
-    send_will(TELOPT_ENCRYPT, 1);
-#endif	/* ENCRYPTION */
-    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 (
-#ifdef	ENCRYPTION
-	   his_do_dont_is_changing(TELOPT_ENCRYPT) ||
-#endif	/* ENCRYPTION */
-	   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();
-    }
-#ifdef	ENCRYPTION
-    /*
-     * Wait for the negotiation of what type of encryption we can
-     * send with.  If autoencrypt is not set, this will just return.
-     */
-    if (his_state_is_will(TELOPT_ENCRYPT)) {
-	encrypt_wait();
-    }
-#endif	/* ENCRYPTION */
-    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];
-char remote_host_name[MAXHOSTNAMELEN];
-
-extern void telnet P((int, int, char *));
-
-int level;
-char user_name[256];
-/*
- * Get a pty, scan input lines.
- */
-doit(who)
-	struct sockaddr_in *who;
-{
-	char *host, *inet_ntoa();
-	int t;
-	struct hostent *hp;
-	int ptynum;
-
-	/*
-	 * 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, *getpty();
-
-		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 */
-	hp = gethostbyaddr((char *)&who->sin_addr, sizeof (struct in_addr),
-		who->sin_family);
-
-	if (hp == NULL && registerd_host_only) {
-		fatal(net, "Couldn't resolve your address into a host name.\r\n\
-         Please contact your net administrator");
-	} else if (hp &&
-	    (strlen(hp->h_name) <= (unsigned int)((utmp_len < 0) ? -utmp_len
-								 : utmp_len))) {
-		host = hp->h_name;
-	} else {
-		host = inet_ntoa(who->sin_addr);
-	}
-	/*
-	 * We must make a copy because Kerberos is probably going
-	 * to also do a gethost* and overwrite the static data...
-	 */
-	strncpy(remote_host_name, host, sizeof(remote_host_name)-1);
-	remote_host_name[sizeof(remote_host_name)-1] = 0;
-	host = remote_host_name;
-
-	(void) gethostname(host_name, sizeof (host_name));
-	hostname = host_name;
-
-#if	defined(AUTHENTICATION) || defined(ENCRYPTION)
-	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);
-
-#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, host);		/* begin server process */
-
-	/*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
-telnet(f, p, host)
-	int f, p;
-	char *host;
-{
-	int on = 1;
-#define	TABBUFSIZ	512
-	char	defent[TABBUFSIZ];
-	char	defstrs[TABBUFSIZ];
-#undef	TABBUFSIZ
-	char *HE;
-	char *HN;
-	char *IM;
-	void netflush();
-	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, "default") == 1) {
-		char *getstr();
-		char *cp=defstrs;
-
-		HE = getstr("he", &cp);
-		HN = getstr("hn", &cp);
-		IM = getstr("im", &cp);
-		if (HN && *HN)
-			(void) strcpy(host_name, HN);
-		if (IM == 0)
-			IM = "";
-	} else {
-		IM = DEFAULT_IM;
-		HE = 0;
-	}
-	edithost(HE, host_name);
-	if (hostinfo && *IM)
-		putf(IM, ptyibuf2);
-
-	if (pcc)
-		(void) strncat(ptyibuf2, 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);});
-
-	/*
-	 * Startup the login process on the slave side of the terminal
-	 * now.  We delay this until here to insure option negotiation
-	 * is complete.
-	 */
-	startslave(host, level, user_name);
-
-	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';
-}