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nss-mdns
nss-mdns-config
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File nss-mdns-config of Package nss-mdns
#!/bin/sh # vim: set ts=2 sw=2 et: # # Copyright (c) 2012, Novell, Inc. # All rights reserved. # # Redistribution and use in source and binary forms, with or without # modification, are permitted provided that the following conditions are met: # # * Redistributions of source code must retain the above copyright notice, # this list of conditions and the following disclaimer. # * Redistributions in binary form must reproduce the above copyright notice, # this list of conditions and the following disclaimer in the documentation # and/or other materials provided with the distribution. # * Neither the name of the <ORGANIZATION> nor the names of its contributors # may be used to endorse or promote products derived from this software # without specific prior written permission. # # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE # LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE # POSSIBILITY OF SUCH DAMAGE. # # # (Licensed under the simplified BSD license) # # Authors: Vincent Untz <vuntz@opensuse.org> # NSSWITCH=/etc/nsswitch.conf function usage() { echo "nss-mdns-config [--enable|--disable] [-4|-6] [--no-backup]" } ENABLE=0 DISABLE=0 IPv4=0 IPv6=0 IPvALL=0 BACKUP=1 while test $# -gt 0; do case "$1" in --enable) ENABLE=1; shift;; --disable) DISABLE=1; shift;; -4) IPv4=1; shift;; -6) IPv6=1; shift;; --no-backup) BACKUP=0; shift;; *) usage; exit 1;; esac done if test "$ENABLE" -eq 1 -a "$DISABLE" -eq 1; then usage exit 1 fi if test "$IPv4" -eq 1 -a "$IPv6" -eq 1; then # Supporting -4 and -6 at the same time would make --enable more complex, # since we'd like it to add both mdns4_minimal and mdns6_minimal. So just # don't do it for now. usage exit 1 fi if test "$IPv4" -ne 1 -a "$IPv6" -ne 1; then IPv4=1 IPv6=1 IPvALL=1 fi if test ! -f "$NSSWITCH"; then if test "$ENABLE" -ne 1 -a "$DISABLE" -ne 1; then echo "No $NSSWITCH file." fi exit 0 fi HOSTS=$(grep -m1 "^\s*hosts:" "$NSSWITCH") if test $? -ne 0; then echo "No hosts configuration in $NSSWITCH." exit 0 fi VALUE=$(echo $HOSTS | sed "s/^\s*hosts:\s*//g") if test "$ENABLE" -ne 1 -a "$DISABLE" -ne 1; then IPv4_ENABLED=0 IPv6_ENABLED=0 ENABLED=0 for ITEM in $VALUE; do if test "$ITEM" == "mdns4_minimal" -o "$ITEM" == "mdns4"; then IPv4_ENABLED=1 elif test "$ITEM" == "mdns6_minimal" -o "$ITEM" == "mdns6"; then IPv6_ENABLED=1 elif test "$ITEM" == "mdns_minimal" -o "$ITEM" == "mdns"; then ENABLED=1 fi done if test "$ENABLED" -eq 1; then echo "Full support for nss-mdns is enabled." elif test "$IPv4_ENABLED" -eq 1 -a "$IPv6_ENABLED" -eq 1; then echo "Support for nss-mdns is enabled for IPv4 and IPv6." elif test "$IPv4_ENABLED" -eq 1; then echo "Support for nss-mdns is enabled for IPv4." elif test "$IPv6_ENABLED" -eq 1; then echo "Support for nss-mdns is enabled for IPv6." else echo "Support for nss-mdns is disabled." fi elif test "$DISABLE" -eq 1; then NEWVALUE="" DROPACTION=0 for ITEM in $VALUE; do if test \( "$ITEM" == "mdns4_minimal" -o "$ITEM" == "mdns4" \) -a "$IPv4" -eq 1; then DROPACTION=1 elif test \( "$ITEM" == "mdns6_minimal" -o "$ITEM" == "mdns6" \) -a "$IPv6" -eq 1; then DROPACTION=1 elif test "$ITEM" == "mdns_minimal" -o "$ITEM" == "mdns"; then if test "$IPvALL" -eq 1; then DROPACTION=1 elif test "$IPv4" -eq 1; then NEWVALUE="$NEWVALUE `echo $ITEM | sed 's:mdns:mdns6:'`" DROPACTION=0 elif test "$IPv6" -eq 1; then NEWVALUE="$NEWVALUE `echo $ITEM | sed 's:mdns:mdns4:'`" DROPACTION=0 else echo "Internal error when disabling $ITEM." exit 1 fi elif test "${ITEM::1}" == "[" -a "$DROPACTION" -eq 1; then DROPACTION=0 else NEWVALUE="$NEWVALUE $ITEM" DROPACTION=0 fi done NEWVALUE=$(echo $NEWVALUE | sed "s/^\s*//;s/^\s*$//") if test "$BACKUP" -eq 1; then cp -a "$NSSWITCH" "${NSSWITCH}bak" fi sed -i "s/\(^\s*hosts:\s*\).*/\1$NEWVALUE/" "$NSSWITCH" elif test "$ENABLE" -eq 1; then NEWVALUE="" FOUND=0 FOUND_DNS=0 DROPACTION=0 for ITEM in $VALUE; do if test \( "$ITEM" == "mdns_minimal" -o "$ITEM" == "mdns4_minimal" -o "$ITEM" == "mdns6_minimal" \); then if test "$FOUND_DNS" -eq 1; then # don't keep *_minimal after dns; it's not desired there DROPACTION=1 else if test "$IPvALL" -eq 1 -a \( "$ITEM" == "mdns4_minimal" -o "$ITEM" == "mdns6_minimal" \); then # no need to keep mdns[46]_minimal since we'll add mdns_minimal DROPACTION=1 else if test "$ITEM" == "mdns_minimal"; then FOUND=1 elif test "$ITEM" == "mdns4_minimal" -a "$IPv4" -eq 1; then FOUND=1 elif test "$ITEM" == "mdns6_minimal" -a "$IPv6" -eq 1; then FOUND=1 fi # force the use of [NOTFOUND=return] after *_minimal NEWVALUE="$NEWVALUE $ITEM [NOTFOUND=return]" DROPACTION=1 fi fi elif test \( "$ITEM" == "mdns" -o "$ITEM" == "mdns4" -o "$ITEM" == "mdns6" \); then # we simply don't use the non-minimal version in our setup, so drop it DROPACTION=1 elif test "$ITEM" == "dns"; then FOUND_DNS=1 DROPACTION=0 if test "$FOUND" -ne 1; then FOUND=1 if test "$IPvALL" -eq 1; then NEWVALUE="$NEWVALUE mdns_minimal [NOTFOUND=return] $ITEM" elif test "$IPv4" -eq 1; then NEWVALUE="$NEWVALUE mdns4_minimal [NOTFOUND=return] $ITEM" elif test "$IPv6" -eq 1; then NEWVALUE="$NEWVALUE mdns6_minimal [NOTFOUND=return] $ITEM" else echo "Internal error when enabling." exit 1 fi else NEWVALUE="$NEWVALUE $ITEM" fi elif test "${ITEM::1}" == "[" -a "$DROPACTION" -eq 1; then DROPACTION=0 else NEWVALUE="$NEWVALUE $ITEM" DROPACTION=0 fi done if test "$FOUND_DNS" -ne 1; then echo "No dns service for hosts configuration in $NSSWITCH." exit 0 fi NEWVALUE=$(echo $NEWVALUE | sed "s/^\s*//;s/^\s*$//") if test "$BACKUP" -eq 1; then cp -a "$NSSWITCH" "${NSSWITCH}bak" fi sed -i "s/\(^\s*hosts:\s*\).*/\1$NEWVALUE/" "$NSSWITCH" fi
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