Date: Sat, 27 Mar 2010 13:46:29 +0100 From: =?ISO-8859-1?Q?Samuel_Mart=EDn_Moro?= <faust64@gmail.com> To: Polytropon <freebsd@edvax.de> Cc: Jozsef Vadkan <jozsi.avadkan@gmail.com>, FreeBSD Mailing list <freebsd-questions@freebsd.org> Subject: Re: "internet connection tester script" Message-ID: <ce5f79aa1003270546s5a9ec43fq793ccd596b3023cb@mail.gmail.com> In-Reply-To: <20100327132214.c414f2d2.freebsd@edvax.de> References: <1269691634.12702.11.camel@debian> <20100327132214.c414f2d2.freebsd@edvax.de>
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I prefer to use `host' command
ping take time to run, especially when it do not respond...
here's my script
root@omega ~ : cat /usr/local/bin/check_connectivity
13:43
#!/bin/sh
# checks local and internet connectivity
# faust - 2010/02/17
host google.com >/dev/null
if [ $? -eq 0 ];
then
net=3D1
echo "Internet connection is UP"
else
net=3D0
echo "Internet connection is DOWN"
fi
host alpha.faust-network >/dev/null
if [ $? -eq 0 ];
then
local=3D1
echo "Local network is UP"
else
local=3D0
echo "local network is DOWN"
fi
case `expr $local '*' 2 + $net` in
0) exit 2 ;; # big nothing
1) exit 42 ;; # just internet (uhu?)
2) exit 1 ;; # just local
3) exit 0 ;; # all right!
*) exit 43 ;; # divided by zero?
esac
Samuel Mart=EDn Moro
{EPITECH.} tek4
CamTrace S.A.S
On Sat, Mar 27, 2010 at 1:22 PM, Polytropon <freebsd@edvax.de> wrote:
> On Sat, 27 Mar 2010 13:07:14 +0100, Jozsef Vadkan <jozsi.avadkan@gmail.co=
m>
> wrote:
> > Why doesn't my "internet-connection" script work?
> >
> > When I plug the ethcable out, it just waits...and waits...and waits...
>
> It doesn't even work correctly: Now as I definitely have
> Internet connection, it prints "NO INTERNET CONNECTION".
>
> Allow me a comment:
>
> #!/bin/bash
>
> This is Linux. It is not portable. FreeBSD is NOT Linux.
>
> In FreeBSD, the standard scripting shell is the Bourne
> shell /bin/sh. Unless you don't require things that are
> specific to bash, use the correct shebang for shm which is
>
> #!/bin/sh
>
> If you intendedly want to use bash, specify it correctly:
>
> #!/usr/local/bin/bash
>
> The bash is an additional package for FreeBSD, it does not
> belong to the OS itself. It needs to be installed. Of
> course, there's a way to make bash available as /bin/bash
> statically linked, but with all thoughts to interoperability,
> I wouldn't rely on this.
>
> Let me bring the script into a more easily readable form
> and allow me to say something about it:
>
> #!/bin/sh
>
> function internet_connection_ok
> {
> echo "Testing internet connection....please wait..."
> if ping -W 1 -c 4 bix.hu | grep -q "4 received"; then
> if ping -W 1 -c 4 www.yahoo.com | grep -q "4 received";
> then
> echo "NET is OK"
> else
> echo "NO INTERNET CONNECTION"
> exit 1
> fi
> else
> echo "NO INTERNET CONNECTION"
> exit 1
> fi
> }
>
> internet_connection_ok
>
> Basically, you're relying on a 100 % correct reception of
> pings from two specified host to see if Internet is up and
> running. In case of package loss, even with running Internet
> (e. g. 4 sent, 3 received), the script would say that there's
> no Internet connection, which is false. Additionally, you're
> giving only 1 ms for reply, which may not be enough for a
> slow (but stable) connection. Finally, you're relying on
> DNS to get the IPs to ping for bix.hu and www.yahoo.com.
> I'm not sure if this resolve time is important here, too.
>
>
>
>
> --
> Polytropon
> Magdeburg, Germany
> Happy FreeBSD user since 4.0
> Andra moi ennepe, Mousa, ...
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