Add ISDN support via isdnd & i4b. This requires version

0.81.1 of the i4b code - namely support of the I4B_VR_REQ
ioctl via the i4brbchX device.

Ppp controls the phone number, but idle timers and
SYNC/RAW decisions are still made by isdnd (in isdnd.rc).

This involves a new datalink state machine phase.  The
``wait for carrier'' phase happens after dialing but
before logging in.  The whole dial state should really
be abstracted so that each device type can deal with it
in its own way (thinking about PPPoE) - but that'll have
to wait.

The ``set cd'' symantics remain the same for tty devices,
but we now delay until we either get CD or timeout waiting
(at which time we drop the link if we require CD).

For i4b devices we always insist on carrier.

Thanks to hm@ for his help, and especially for pointing out
that I *don't* need to re-implement isdnd (that was a huge
waste of time !) :-]

1 files changed, 41 insertions, 10 deletions

diff --git a/usr.sbin/ppp/ppp.8.m4 b/usr.sbin/ppp/ppp.8.m4
index e95c147..f62598a 100644
--- a/usr.sbin/ppp/ppp.8.m4
+++ b/usr.sbin/ppp/ppp.8.m4
@@ -1,4 +1,4 @@
-.\" $Id: ppp.8,v 1.186 1999/08/03 16:14:38 brian Exp $
+.\" $Id: ppp.8,v 1.187 1999/08/05 10:32:14 brian Exp $
 .Dd 20 September 1995
 .nr XX \w'\fC00'
 .Os FreeBSD
@@ -249,6 +249,13 @@ will open a TCP or UDP connection for transporting data rather than using a
 conventional serial device.  UDP connections force
 .Nm
 into synchronous mode.
+.It Supports PPP over ISDN
+If
+.Nm
+is given a raw B-channel i4b device to open as a link, it's able to talk
+to the
+.Xr isdnd 8
+daemon to establish an ISDN connection.
 .It "Supports IETF draft Predictor-1 (rfc 1978) and DEFLATE (rfc 1979) compression."
 .Nm
 supports not only VJ-compression but also Predictor-1 and DEFLATE compression.
@@ -3531,16 +3538,24 @@ checks for the existence of carrier one second after the login script is
 complete.  If it's not set,
 .Nm
 assumes that this is because the device doesn't support carrier (which
-is true for most NULL-modem cables), logs the fact and stops checking
+is true for most
+.Dq laplink
+NULL-modem cables), logs the fact and stops checking
 for carrier.  However, some modems take some time to assert the carrier
 signal, resulting in
 .Nm ppp Ns No s
 inability to detect when the link is dropped.
-.Ar Seconds
+.Ar seconds
 specifies the number of seconds that
 .Nm
-should wait after the login script has finished before first checking for
-carrier.
+should wait after the dial script has finished before deciding if
+carrier is available or not.
+.Pp
+.Nm
+will not proceed to the login script until either carrier is detected
+or until
+.Ar seconds
+has elapsed.
 .Pp
 If
 .Ar seconds
@@ -3549,12 +3564,21 @@ is followed immediately by an exclaimation mark
 .Nm
 will
 .Em require
-carrier.  If carrier is not detected at the first check, the link will
-be considered disconnected.
+carrier.  If carrier is not detected after
+.Ar seconds
+seconds, the link will be disconnected.
+.Pp
+For ISDN devices,
+.Nm
+will always insist on carrier.  Carrier is raised by the i4brbchX device
+driver only after the call has connected.  It is therefore wise to set
+a reasonable value such as
+.Ar 6
+seconds.
 .Pp
 Carrier
 .Em require Ns No ment
-is ignored when the link is not a tty device.
+is ignored for all other device types.
 .It set choked Op Ar timeout
 This sets the number of seconds that
 .Nm
@@ -3620,8 +3644,14 @@ This sets the device(s) to which
 .Nm
 will talk to the given
 .Dq value .
-All serial device names are expected to begin with
+.Pp
+All ISDN and serial device names are expected to begin with
 .Pa /dev/ .
+ISDN devices are usually called
+.Pa i4brbchX
+and serial devices are usually called
+.Pa cuaaX .
+.Pp
 If
 .Dq value
 does not begin with
@@ -3629,7 +3659,7 @@ does not begin with
 it must either begin with an exclamation mark
 .Pq Dq \&!
 or be of the format
-.Dq host:port .
+.Dq host:port Ns Op Ns /proto .
 .Pp
 If it begins with an exclamation mark, the rest of the device name is
 treated as a program name, and that program is executed when the device
@@ -4645,6 +4675,7 @@ This socket is used to pass links between different instances of
 .Xr getty 8 ,
 .Xr inetd 8 ,
 .Xr init 8 ,
+.Xr isdn 8 ,
 .Xr named 8 ,
 .Xr ping 8 ,
 .Xr pppctl 8 ,