Date: Tue, 05 Dec 2000 08:45:58 -0700 From: Wes Peters <wes@softweyr.com> To: Julian Elischer <julian@elischer.org> Cc: oscar@163.net, freebsd-hackers@freebsd.org Subject: Re: get tun0's ip from my program Message-ID: <3A2D0DB6.F67E2DE@softweyr.com> References: <3A2B8A42.09234@bjapp6.163.net> <3A2C1917.AFF94A06@elischer.org>
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Julian Elischer wrote:
>
> oscar@163.net wrote:
> >
> > I want to get tun0's two ip addresses.
> > and add ipfw rules to system at my program.
> > How can I do it?is there a function? or
> > have document describe it. someone please tell me!
> ifconfig tun0 | awk {small awk program}
>
> of course WHY do you want to do this?
>
> that may help more..
It's easier to record your addresses in some convenient form, then use
that information to both set the addresses for the interface via ifconfig,
and to "program" the firewall (and nat, if used). We store ours in a
pair of shell scripts, which look like:
/etc/extern.config:
# DoBox network configuration created Tue Dec 5 08:33:49 MST 2000
extern_interface=rl0
extern_port=rl0
extern_ipaddress=0.0.0.0
extern_netmask=0.0.0.0
extern_cidr=0
extern_broadcast=0.0.0.0
extern_network=0.0.0.0
extern_configured=no
/etc/intern.config:
# DoBox network configuration created Tue Dec 5 08:33:49 MST 2000
intern_interface=dc0
intern_ipaddress=172.31.0.1
intern_netmask=255.255.252.0
intern_cidr=22
intern_broadcast=172.31.3.255
intern_network=172.31.0.0
intern_netpart=172.31.0
intern_domain=my.dobox
These files can be sourced by scripts that (re-)create the ipfilter and
ipnat rules (in our case), run ifconfig, etc. The extern config can be
modified by dhclient exit hook scripts, ppp "up" configuration scripts,
or by the web interface. The internal configuration can be changed some-
what from the web interface, or by registering a real domain name. The
internal and external interface names are decided automagically during
the "first birthday" boot, by a script with intimate knowledge of what
interfaces actually occur in various types of DoBox hardware.
Most of the configuration files that need to be edited with this
information we have renamed to file.in. We have a script, configure.net,
that sources the above files and then edits each of the .in files to
the actual file and restarts whatever is needed to bring the system up
to date with the new configuration.
--
"Where am I, and what am I doing in this handbasket?"
Wes Peters Softweyr LLC
wes@softweyr.com http://softweyr.com/
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