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#! /bin/bash
#
# Copyright (C) 2011 Intel Corporation
#
# Does DNS SRV and TXT queries to find the full URL, including method
# (HTTP or HTTPS), host name, port and path (currently hard-coded to
# .well-known/<type>, should use TXT, except that none of the current
# services seem to use that either, so couldn't test).
#
# See http://tools.ietf.org/html/draft-daboo-srv-caldav-10
#
# Works with a variety of underlying utilities:
# - adnshost
# - host
# - nslookup
#
# Usage: syncevo-webdav-lookup.sh carddav|caldav <domain>
# Stdout: http[s]://<domain>:<port>/<path>
# Stderr: error messages indicating failure, empty for success
# Return codes:
# 1 general error
# 2 no DNS utility found
# 3 no result for domain
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) version 3.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA
#
set -o pipefail
TYPE=$1
DOMAIN=$2
# Dump diagnostics on exit, if it still exists.
LOG=`mktemp`
trap "[ -s $LOG ] && ( echo $0 failed to find '$TYPE $DOMAIN':; cat $LOG >&2 ); rm -f $LOG" EXIT
# find one of the supported tools for DNS queries
TOOL=
ALTERNATIVES="adnshost host nslookup"
for i in $ALTERNATIVES; do
if which $i >/dev/null; then
TOOL=$i
break
fi
done
if [ ! "$TOOL" ]; then
echo "need one of: $ALTERNATIVES" >&2
exit 2
fi
# redirect tool errors and commands executed into log;
# try HTTPS first
for type in ${TYPE}s ${TYPE}; do
(
case $type in
*s) METHOD=https;;
*) METHOD=http;;
esac
HOSTNAME=
PORT=
# should be looked up via TXT, currently hard-coded
URLPATH=.well-known/$TYPE
set -xeo pipefail
case $TOOL in
adnshost)
res=`$TOOL -Fi -tsrv _$type._tcp.$DOMAIN | tee -a $LOG | grep ^_$type._tcp.$DOMAIN`
# _carddavs._tcp.yahoo.com.cn SRV 1 1 443 carddav.address.yahoo.com misconfig 101 prohibitedcname "DNS alias found where canonical name wanted" ( )
PORT=`echo $res | sed -e 's;.* SRV [^ ]* [^ ]* \([^ ]*\) \([^ ]*\).*;\1;'`
HOSTNAME=`echo $res | sed -e 's;.* SRV [^ ]* [^ ]* \([^ ]*\) \([^ ]*\).*;\2;'`
;;
nslookup)
res=`$TOOL -type=srv _$type._tcp.$DOMAIN | tee -a $LOG | grep "service =" | head -1`
# _caldavs._tcp.yahoo.com service = 1 1 443 caldav.calendar.yahoo.com.
PORT=`echo $res | sed -e 's;.*service = [^ ]* [^ ]* \([^ ]*\) \([^ ]*\)\.;\1;'`
HOSTNAME=`echo $res | sed -e 's;.*service = [^ ]* [^ ]* \([^ ]*\) \([^ ]*\)\.;\2;'`
;;
host)
res=`$TOOL -t srv _$type._tcp.$DOMAIN | tee -a $LOG | grep "has SRV record" | head -1`
# _caldavs._tcp.yahoo.com has SRV record 1 1 443 caldav.calendar.yahoo.com.
PORT=`echo $res | sed -e 's;.* \([^ ]*\) \([^ ]*\)\.;\1;'`
HOSTNAME=`echo $res | sed -e 's;.* \([^ ]*\) \([^ ]*\)\.;\2;'`
;;
*)
echo "unsupported tool $TOOL"
exit 1
;;
esac
# print result
echo $METHOD://$HOSTNAME:$PORT/$URLPATH
) 2>>$LOG
if [ $? -eq 0 ]; then
# success, discard errrors
rm -f $LOG
exit 0
fi
done
# nothing worked
exit 2
|
