Add PPP autodetect, based on code from FreeBSD via OpenBSD.

libexec/getty/gettytab.5

@@ -1,4 +1,4 @@
-.\"	$NetBSD: gettytab.5,v 1.19 1998/04/22 04:54:19 ross Exp $
+.\"	$NetBSD: gettytab.5,v 1.20 1998/10/12 18:03:48 tsarna Exp $
 .\"
 .\" Copyright (c) 1983, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -155,6 +155,7 @@ hangup line on last close
 .It "pe	bool	false	use printer (hard copy) erase algorithm"
 .It "pf	num	0	delay"
 between first prompt and following flush (seconds)
+.It "pp	str	unused	PPP authentication program"
 .It "ps	bool	false	line connected to a"
 .Tn MICOM
 port selector
@@ -358,6 +359,12 @@ implementation.
 does not check parity of input characters in
 .Dv RAW
 mode.
+.Pp
+If
+.Em \&pp
+string is specified and a PPP link bringup sequence is recognized,
+getty will invoke the program referenced by the pp option.  This
+can be used to handle incoming PPP calls.
 .Sh SEE ALSO
 .Xr login 1 ,
 .Xr gethostname 3 ,

libexec/getty/gettytab.h

@@ -1,4 +1,4 @@
-/*	$NetBSD: gettytab.h,v 1.8 1996/07/31 20:40:31 thorpej Exp $	*/
+/*	$NetBSD: gettytab.h,v 1.9 1998/10/12 18:03:49 tsarna Exp $	*/
 
 /*
  * Copyright (c) 1983, 1993, 1994
@@ -86,6 +86,7 @@ struct gettyflags {
 #define FL	gettystrs[21].value
 #define WE	gettystrs[22].value
 #define LN	gettystrs[23].value
+#define PP	gettystrs[24].value
 
 /*
  * Numeric definitions.

libexec/getty/init.c

@@ -1,4 +1,4 @@
-/*	$NetBSD: init.c,v 1.8 1997/08/06 07:22:24 mikel Exp $	*/
+/*	$NetBSD: init.c,v 1.9 1998/10/12 18:03:49 tsarna Exp $	*/
 
 /*
  * Copyright (c) 1983, 1993
@@ -38,7 +38,7 @@
 #if 0
 static char sccsid[] = "from: @(#)init.c	8.1 (Berkeley) 6/4/93";
 #else
-__RCSID("$NetBSD: init.c,v 1.8 1997/08/06 07:22:24 mikel Exp $");
+__RCSID("$NetBSD: init.c,v 1.9 1998/10/12 18:03:49 tsarna Exp $");
 #endif
 #endif /* not lint */
 
@@ -81,6 +81,7 @@ struct	gettystrs gettystrs[] = {
 	{ "fl", &tmode.c_cc[VDISCARD] },/* flush output */
 	{ "we", &tmode.c_cc[VWERASE] },	/* word erase */
 	{ "ln", &tmode.c_cc[VLNEXT] },	/* literal next */
+	{ "pp" },			/* ppp login program */
 	{ 0 }
 };
 

libexec/getty/main.c

@@ -1,4 +1,4 @@
-/*	$NetBSD: main.c,v 1.26 1998/07/06 06:48:19 mrg Exp $	*/
+/*	$NetBSD: main.c,v 1.27 1998/10/12 18:03:49 tsarna Exp $	*/
 
 /*-
  * Copyright (c) 1980, 1993
@@ -44,7 +44,7 @@ __COPYRIGHT("@(#) Copyright (c) 1980, 1993\n\
 #if 0
 static char sccsid[] = "from: @(#)main.c	8.1 (Berkeley) 6/20/93";
 #else
-__RCSID("$NetBSD: main.c,v 1.26 1998/07/06 06:48:19 mrg Exp $");
+__RCSID("$NetBSD: main.c,v 1.27 1998/10/12 18:03:49 tsarna Exp $");
 #endif
 #endif /* not lint */
 
@@ -82,6 +82,16 @@ extern char *__progname;
  */
 #define GETTY_TIMEOUT	60 /* seconds */
 
+/* defines for auto detection of incoming PPP calls (->PAP/CHAP) */
+
+#define PPP_FRAME           0x7e  /* PPP Framing character */
+#define PPP_STATION         0xff  /* "All Station" character */
+#define PPP_ESCAPE          0x7d  /* Escape Character */
+#define PPP_CONTROL         0x03  /* PPP Control Field */
+#define PPP_CONTROL_ESCAPED 0x23  /* PPP Control Field, escaped */
+#define PPP_LCP_HI          0xc0  /* LCP protocol - high byte */
+#define PPP_LCP_LOW         0x21  /* LCP protocol - low byte */
+
 struct termios tmode, omode;
 
 int crmod, digit, lower, upper;
@@ -160,7 +170,7 @@ timeoverrun(signo)
 	int signo;
 {
 
-	syslog(LOG_ERR, "getty exiting due to excessive running time\n");
+	syslog(LOG_ERR, "getty exiting due to excessive running time");
 	exit(1);
 }
 
@@ -183,6 +193,7 @@ main(argc, argv)
 	int repcnt = 0, failopenlogged = 0, uugetty = 0;
 	struct rlimit limit;
 	struct passwd *pw;
+        int rval;
 
 #ifdef __GNUC__
 	(void)&tname;		/* XXX gcc -Wall */
@@ -335,7 +346,11 @@ main(argc, argv)
 			signal(SIGALRM, dingdong);
 			alarm(TO);
 		}
-		if (getname()) {
+		if ((rval = getname()) == 2) {
+		        execle(PP, "ppplogin", ttyn, (char *) 0, env);
+		        syslog(LOG_ERR, "%s: %m", PP);
+		        exit(1);
+		} else if (rval) {
 			int i;
 
 			oflush();
@@ -388,7 +403,8 @@ getname()
 {
 	int c;
 	char *np;
-	char cs;
+	unsigned char cs;
+	int ppp_state, ppp_connection;
 	
 	/*
 	 * Interrupt may happen if we use CBREAK mode
@@ -410,6 +426,7 @@ getname()
 		exit(1);
 	}
 	crmod = digit = lower = upper = 0;
+        ppp_state = ppp_connection = 0;
 	np = name;
 	for (;;) {
 		oflush();
@@ -417,6 +434,34 @@ getname()
 			exit(0);
 		if ((c = cs&0177) == 0)
 			return (0);
+
+		/*
+		 * PPP detection state machine..
+		 * Look for sequences:
+		 * PPP_FRAME, PPP_STATION, PPP_ESCAPE, PPP_CONTROL_ESCAPED or
+		 * PPP_FRAME, PPP_STATION, PPP_CONTROL (deviant from RFC)
+		 * See RFC1662.
+		 * Derived from code from Michael Hancock <michaelh@cet.co.jp>
+		 * and Erik 'PPP' Olson <eriko@wrq.com>
+		 */
+		if (PP && cs == PPP_FRAME) {
+			ppp_state = 1;
+		} else if (ppp_state == 1 && cs == PPP_STATION) {
+			ppp_state = 2;
+		} else if (ppp_state == 2 && cs == PPP_ESCAPE) {
+			ppp_state = 3;
+		} else if ((ppp_state == 2 && cs == PPP_CONTROL) ||
+		    (ppp_state == 3 && cs == PPP_CONTROL_ESCAPED)) {
+			ppp_state = 4;
+		} else if (ppp_state == 4 && cs == PPP_LCP_HI) {
+			ppp_state = 5;
+		} else if (ppp_state == 5 && cs == PPP_LCP_LOW) {
+			ppp_connection = 1;
+			break;
+		} else {
+			ppp_state = 0;
+		}
+
 		if (c == EOT)
 			exit(1);
 		if (c == '\r' || c == '\n' || np >= &name[sizeof name]) {
@@ -463,7 +508,7 @@ getname()
 		for (np = name; *np; np++)
 			if (isupper(*np))
 				*np = tolower(*np);
-	return (1);
+	return (1 + ppp_connection);
 }
 
 static void