Date: Thu, 5 Mar 1998 08:58:57 +0000 From: dmlb@ragnet.demon.co.uk To: Peter van Heusden <pvh@leftside.wcape.school.za> Cc: dmlb@ragnet.demon.co.uk, freebsd-hackers@FreeBSD.ORG Subject: Re: Detecting state of PPP Message-ID: <9803050902.AA18200@symbionics.co.uk> In-Reply-To: <Pine.BSF.3.95.980305071307.15655F-100000@leftside.wcape.school.za>
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> Date: Thu, 5 Mar 1998 07:16:09 +0200 (SAT)
> From: Peter van Heusden <pvh@leftside.wcape.school.za>
> To: freebsd-hackers@FreeBSD.ORG
> Subject: Detecting state of PPP
> Hi
>
> How does one go about writing a program to check if a PPP link is up or
> down? I'm running PPP in -auto mode, and I'd like to be able to tell
> whether the PPP link is actually up (i.e. the modem connection is in
> place) at any particular time. Unfortunately, the flags on tun0 stay the
> same (0x8051 on my system) whether the modem is connected or not. What
> should I be looking at?
>
> Thanks,
> Peter
The generic way is to either use pppctl(8) or connect to the
listening socket and detect the state of the ppp prompt.
ppp ON computer> --- ppp is down
PPP ON computer> --- ppp is up.
Something I did in tcl was the follwoing (from memory)
#!/usr/local/bin/tclsh7.6
set s [socket localhost 3000]
gets $s
gets $s
gets $s
if {[read $s 3] == "PPP"} {
puts "ppp is up"
} else {
puts "ppp is down"
}
close $s
The three gets read the initial banner from pp; the read reads the
first 3 bytes of the prompt.
The socket number 3000 is talked about in the manual
basically ppp will open 3000+tunnel number.
You may also need to set a password in /etc/ppp.secrets.
Note that the new way of talking is via a unix domain socket
(a socket addressable by a file name). But tcl can't open
unix domain sockets, so I did it the old way.
I am using this with TkDesk to give a little phone up/down icon.
Comments Brian?
Duncan
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