Initial commit
This commit is contained in:
Sam Stephenson
commit
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Copyright (c) 2014 Sam Stephenson, Basecamp
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#### xip-pdns
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This is the source of the [PowerDNS](http://powerdns.com/) pipe backend adapter powering [xip.io](http://xip.io/).
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Install this on your system, adjust [etc/xip-pdns.conf](etc/xip-pdns.conf.example) to your liking, and configure PowerDNS as follows:
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launch=pipe
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pipe-command=/path/to/xip-pdns/bin/xip-pdns /path/to/xip-pdns/etc/xip-pdns.conf
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#!/usr/bin/env bash
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set -e
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shopt -s nocasematch
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#
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# Configuration
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#
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XIP_DOMAIN="xip.test"
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XIP_ROOT_ADDRESSES=( "127.0.0.1" )
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XIP_NS_ADDRESSES=( "127.0.0.1" )
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XIP_TIMESTAMP="0"
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XIP_TTL=300
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if [ -a "$1" ]; then
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source "$1"
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fi
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#
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# Protocol helpers
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#
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read_cmd() {
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local IFS=$'\t'
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local i=0
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local arg
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read -ra CMD
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for arg; do
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eval "$arg=\"\${CMD[$i]}\""
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let i=i+1
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done
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}
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send_cmd() {
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local IFS=$'\t'
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printf "%s\n" "$*"
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}
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fail() {
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send_cmd "FAIL"
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log "Exiting"
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exit 1
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}
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read_helo() {
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read_cmd HELO VERSION
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[ "$HELO" = "HELO" ] && [ "$VERSION" = "1" ]
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}
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read_query() {
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read_cmd TYPE QNAME QCLASS QTYPE ID IP
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}
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send_answer() {
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local type="$1"
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shift
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send_cmd "DATA" "$QNAME" "$QCLASS" "$type" "$XIP_TTL" "$ID" "$@"
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}
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log() {
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printf "[xip-pdns:$$] %s\n" "$@" >&2
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}
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#
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# xip.io domain helpers
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#
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XIP_DOMAIN_PATTERN="(^|\.)${XIP_DOMAIN//./\.}\$"
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NS_SUBDOMAIN_PATTERN="^ns-([0-9]+)\$"
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IP_SUBDOMAIN_PATTERN="(^|\.)(((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))\$"
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BASE36_SUBDOMAIN_PATTERN="(^|\.)([a-z0-9]{1,7})\$"
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qtype_is() {
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[ "$QTYPE" = "$1" ] || [ "$QTYPE" = "ANY" ]
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}
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qname_matches_domain() {
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[[ "$QNAME" =~ $XIP_DOMAIN_PATTERN ]]
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}
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qname_is_root_domain() {
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[ "$QNAME" = "$XIP_DOMAIN" ]
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}
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extract_subdomain_from_qname() {
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SUBDOMAIN="${QNAME:0:${#QNAME}-${#XIP_DOMAIN}}"
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SUBDOMAIN="${SUBDOMAIN%.}"
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}
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subdomain_is_ns() {
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[[ "$SUBDOMAIN" =~ $NS_SUBDOMAIN_PATTERN ]]
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}
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subdomain_is_ip() {
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[[ "$SUBDOMAIN" =~ $IP_SUBDOMAIN_PATTERN ]]
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}
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subdomain_is_base36() {
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[[ "$SUBDOMAIN" =~ $BASE36_SUBDOMAIN_PATTERN ]]
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}
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resolve_ns_subdomain() {
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local index="${SUBDOMAIN:3}"
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echo "${XIP_NS_ADDRESSES[$index-1]}"
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}
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resolve_ip_subdomain() {
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[[ "$SUBDOMAIN" =~ $IP_SUBDOMAIN_PATTERN ]] || true
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echo "${BASH_REMATCH[2]}"
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}
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resolve_base36_subdomain() {
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[[ "$SUBDOMAIN" =~ $BASE36_SUBDOMAIN_PATTERN ]] || true
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local ip=$(( 36#${BASH_REMATCH[2]} ))
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printf "%d.%d.%d.%d" $(( ip&0xFF )) $(( (ip>>8)&0xFF )) $(( (ip>>16)&0xFF )) $(( (ip>>24)&0xFF ))
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}
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answer_soa_query() {
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send_answer "SOA" "admin.$XIP_DOMAIN ns-1.$XIP_DOMAIN $XIP_TIMESTAMP $XIP_TTL $XIP_TTL $XIP_TTL $XIP_TTL"
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}
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answer_ns_query() {
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local i=1
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local ns_address
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for ns_address in "${XIP_NS_ADDRESSES[@]}"; do
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send_answer "NS" "ns-$i.$XIP_DOMAIN"
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let i+=1
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done
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}
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answer_root_a_query() {
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local address
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for address in "${XIP_ROOT_ADDRESSES[@]}"; do
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send_answer "A" "$address"
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done
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}
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answer_subdomain_a_query_for() {
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local type="$1"
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local address="$(resolve_${type}_subdomain)"
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if [ -n "$address" ]; then
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send_answer "A" "$address"
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fi
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}
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#
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# PowerDNS pipe backend implementation
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#
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trap fail err
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read_helo
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send_cmd "OK" "xip.io PowerDNS pipe backend (protocol version 1)"
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while read_query; do
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log "Query: type=$TYPE qname=$QNAME qclass=$QCLASS qtype=$QTYPE id=$ID ip=$IP"
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if qname_matches_domain; then
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if qname_is_root_domain; then
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if qtype_is "SOA"; then
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answer_soa_query
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fi
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if qtype_is "NS"; then
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answer_ns_query
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fi
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if qtype_is "A"; then
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answer_root_a_query
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fi
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elif qtype_is "A"; then
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extract_subdomain_from_qname
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if subdomain_is_ns; then
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answer_subdomain_a_query_for ns
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elif subdomain_is_ip; then
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answer_subdomain_a_query_for ip
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elif subdomain_is_base36; then
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answer_subdomain_a_query_for base36
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fi
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fi
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fi
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send_cmd "END"
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done
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# Increment this timestamp when the contents of the file change.
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XIP_TIMESTAMP="2014102800"
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# The top-level domain for which the name server is authoritative.
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XIP_DOMAIN="xip.test"
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# The public IP addresses (e.g. for the web site) of the top-level domain.
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# `A` queries for the top-level domain will return this list of addresses.
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XIP_ROOT_ADDRESSES=( "1.2.3.1" )
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# The public IP addresses on which this xip-pdns server will run.
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# `NS` queries for the top-level domain will return this list of addresses.
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# Each entry maps to a 1-based subdomain of the format `ns-1`, `ns-2`, etc.
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# `A` queries for these subdomains map to the corresponding addresses here.
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XIP_NS_ADDRESSES=( "1.2.3.4" "1.2.3.5" )
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# How long responses should be cached, in seconds.
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XIP_TTL=300
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