/ppp/ip-up.d/0dns-up
http://github.com/brinkman83/bashrc · Shell · 120 lines · 53 code · 27 blank · 40 comment · 21 complexity · b6bca8a403a34713eb6e7018a02e032c MD5 · raw file
- #!/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 ] && { /etc/init.d/nscd restart || true ; }