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Server IP : 20.75.53.88 / Your IP : 216.73.217.165 [ Reverse IP ]
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Directory : /etc/ppp/ip-up.d/

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Current File : /etc/ppp/ip-up.d/0dns-up

#!/bin/sh

# $Id: 0dns-up,v 1.1.1.1 2004/05/07 03:12:59 john Exp $

# 0dns-up by John Hasler 1999-2006.
# Any possessor of a copy of this program may treat it as if it
# were in the public domain.  I waive all rights.

# Rev. Dec 22 1999 to put dynamic nameservers last.
# Rev. Aug 20 2001 to use patch from Sergio Gelato <Sergio.Gelato@astro.su.se>.
# Rev. Dec 12 2002 to delete USEPEERDNS variable and add MS_DNS1 and MS_DNS2.
# Rev. Jan 5 2003 added explanatory text.
# Rev. May 15 2003 to move operations to /var/run/pppconfig.
# Rev. Apr 12 2004 to use resolvconf if installed.

# 0dns-up sets up /etc/resolv.conf for the provider being connected to.  In
# conjunction with pppd's usepeerdns option it also handles dynamic dns.
# It expects to be passed the provider name in PPP_IPPARAM.

# Pppconfig creates a file in /etc/ppp/resolv for each provider for which the
# administrator chooses 'Static' or 'Dynamic' in the 'Configure Nameservers'
# screen.  The files for providers for which 'Static' was chosen contain the
# nameservers given by the administrator.  Those for which 'Dynamic' was chosen
# are empty.  0dns-up fills in the nameservers when pppd gets them from the
# provider when the connection comes up.  You can edit these files, adding 
# 'search' or 'domain' directives or additional nameservers.  Read the 
# resolv.conf manual first, though. 


PATH=/sbin:/bin:/usr/sbin:/usr/bin
# If pppconfig has been removed we are not supposed to do anything.
test -f /usr/sbin/pppconfig || exit 0

# If we don't have a provider we have nothing to do.
test -z "$PPP_IPPARAM" && exit 0

# Strip options.
PROVIDER=`echo "$PPP_IPPARAM" | cut -d' ' -f1`

ETC="/etc"
RUNDIR="/var/cache/pppconfig"
RESOLVCONF="$ETC/resolv.conf"
PPPRESOLV="$ETC/ppp/resolv"
TEMPLATE="$RUNDIR/0dns.tempXXXXXXXX"
RESOLVBAK="$RUNDIR/resolv.conf.bak.$PROVIDER"

# Is PROVIDER something we can use?

test -f "$PPPRESOLV/$PROVIDER" || exit 0

if [ -x /sbin/resolvconf ]; then
	test -n "$PPP_IFACE" || exit 1
	/sbin/resolvconf -a "${PPP_IFACE}.pppconfig" < "$PPPRESOLV/$PROVIDER"
	exit
fi

umask 022
cd "$RUNDIR" || exit 1

# Is resolv.conf a non-symlink on a ro root? If so give up.

[ -e /proc/mounts ] || { echo "$0: Error: Could not read /proc/mounts" ; exit 1 ; }
[ -L  "$RESOLVCONF" ] || grep " / " /proc/mounts | grep -q " rw " || exit 0


# Put the resolv.conf for this provider in a temp file.  If we are using
# dynamic dns it will be empty or contain any resolver options the user
# added.  Otherwise it will be a complete resolv.conf for this provider.

TEMPRESOLV=`mktemp $TEMPLATE` || exit 1
mv "$TEMPRESOLV" "$RUNDIR/0dns.$PROVIDER" || exit 1
TEMPRESOLV="$RUNDIR/0dns.$PROVIDER"
cat "$PPPRESOLV/$PROVIDER" > "$TEMPRESOLV"

# DNS1 and DNS2 are variables exported by pppd when using 'usepeerdns'.
# Do we have them?  If so, we are using "dynamic dns".  Append a couple of
# nameserver lines to the temp file.

if [ "$DNS1" ] ; then
    echo '' >> "$TEMPRESOLV"
    echo "nameserver $DNS1" >> "$TEMPRESOLV"
    if [ "$DNS2" ] ; then
	echo '' >> "$TEMPRESOLV"
        echo "nameserver $DNS2" >> "$TEMPRESOLV"
    fi
# ipppd uses MS_DNS1 and MS_DNS2 instead of DNS1 and DNS2.
elif [ "$MS_DNS1" ] ; then
    echo '' >> "$TEMPRESOLV"
    echo "nameserver $MS_DNS1" >> "$TEMPRESOLV"
    if [ "$MS_DNS2" ] ; then
	echo '' >> "$TEMPRESOLV"
        echo "nameserver $MS_DNS2" >> "$TEMPRESOLV"
    fi
fi

# We should have something in TEMPRESOLV by now.  If not we'd 
# better quit.

if [ ! -s "$TEMPRESOLV" ]
    then
    rm -f "$TEMPRESOLV"
    exit 1
fi

# We better not do anything if a RESOLVBAK already exists.
if  ls | grep -q "resolv.conf.bak"
    then
    rm -f "$TEMPRESOLV"
    exit 1
fi

# Back up resolv.conf. Follow symlinks.  Keep TEMPRESOLV
# around for 0dns-down to look at.
/bin/cp -Lp "$RESOLVCONF" "$RESOLVBAK" || exit 1
/bin/cp -Lp "$TEMPRESOLV" "$RESOLVCONF" || exit 1
chmod 644 "$RESOLVCONF" || exit 1


# Restart nscd because resolv.conf has changed
[ -x /etc/init.d/nscd ] && { invoke-rc.d nscd restart || true ; }

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