Highly-available dnscrypt-proxy client setup on OSX with DNSSEC.

00_ha_dnscrypt_proxy_client_setup.markdown

Tested, works!

Install

git clone https://gist.github.com/ebaea058822dede2a6d0 && cd ebaea058822dede2a6d0 && sh install.sh && cd .. && rm -rf ebaea058822dede2a6d0

Uninstall

git clone https://gist.github.com/ebaea058822dede2a6d0 && cd ebaea058822dede2a6d0 && sh uninstall.sh && cd .. && rm -rf ebaea058822dede2a6d0

config

ADAPTERS='Wi-Fi'
START_PORT=5300
DNSCRYPT_RESOLVERS='cs-fr dnscrypt.eu-dk'
DNSMASQ_PLIST='/Library/LaunchDaemons/homebrew.mxcl.dnsmasq.plist'

functions

ports() {
  echo "$DNSCRYPT_RESOLVERS" | wc -w
}

homebrew.mxcl.dnscrypt-proxy.template.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
        <key>KeepAlive</key>
        <true/>
        <key>Label</key>
        <string>homebrew.mxcl.dnscrypt-proxy.__PORT__</string>
        <key>ProgramArguments</key>
        <array>
        <string>/usr/local/opt/dnscrypt-proxy/sbin/dnscrypt-proxy</string>
                <string>--user=nobody</string>
                <string>--logfile=/dev/null</string>
    <string>--resolver-name=__RESOLVER__</string>
    <string>-a</string>
    <string>127.0.0.1:__PORT__</string>
        </array>
        <key>RunAtLoad</key>
        <true/>
        <key>UserName</key>
        <string>root</string>
</dict>
</plist>

homebrew.mxcl.dnsmasq.footer.plist

    </array>
    <key>RunAtLoad</key>
    <true/>
    <key>KeepAlive</key>
    <true/>
  </dict>
</plist>

homebrew.mxcl.dnsmasq.header.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
  <dict>
    <key>Label</key>
    <string>homebrew.mxcl.dnsmasq</string>
    <key>ProgramArguments</key>
    <array>
      <string>/usr/local/opt/dnsmasq/sbin/dnsmasq</string>
      <string>--keep-in-foreground</string>
      <string>--no-resolv</string>
      <string>--no-poll</string>
      <string>--all-servers</string>
      <string>--proxy-dnssec</string>
      <string>--interface=lo0</string>
      <string>--bind-interfaces</string>

install.sh

#!/bin/sh
#
# usage: git clone https://gist.github.com/fccbf0f02355a31f7959 && cd fccbf0f02355a31f7959 && sh install.sh && cd .. && rm -rf fccbf0f02355a31f7959
#
set -e

source config
source functions

install_service() {
  sudo launchctl load -w "$1"
}

dnscrypt_proxy_templatize_plist() {
  sed "s/__RESOLVER__/$1/g;s/__PORT__/$2/g" homebrew.mxcl.dnscrypt-proxy.template.plist
}

brew install dnscrypt-proxy
brew install dnsmasq --with-dnssec
sudo cp -i homebrew.mxcl.dnsmasq.header.plist "$DNSMASQ_PLIST"

PORT="$START_PORT"
for RESOLVER in $DNSCRYPT_RESOLVERS; do
  PLIST="/Library/LaunchDaemons/homebrew.mxcl.dnscrypt-proxy.$PORT.plist"
  dnscrypt_proxy_templatize_plist $RESOLVER $PORT | sudo tee "$PLIST" >/dev/null
  install_service "$PLIST"
  echo "      <string>--server=127.0.0.1#$PORT</string>" | sudo tee -a "$DNSMASQ_PLIST" >/dev/null
  PORT=$((PORT+1))
done

sudo tee -a "$DNSMASQ_PLIST" >/dev/null < homebrew.mxcl.dnsmasq.footer.plist

install_service "$DNSMASQ_PLIST"

for ADAPTER in $ADAPTERS; do
  sudo networksetup -setdnsservers "$ADAPTER" 127.0.0.1
done

echo 'Finished installing dnscrypt-proxy HA setup'

uninstall.sh

#!/bin/sh
#
# usage: git clone https://gist.github.com/fccbf0f02355a31f7959 && cd fccbf0f02355a31f7959 && sh uninstall.sh && cd .. && rm -rf fccbf0f02355a31f7959
#
set -e

source config
source functions

delete_service() {
  sudo launchctl unload -w "$1"
  sudo rm -f "$1"
}

for ADAPTER in $ADAPTERS; do
  sudo networksetup -setdnsservers "$ADAPTER" Empty
done

brew uninstall dnsmasq
delete_service "$DNSMASQ_PLIST"

brew uninstall dnscrypt-proxy

for PLIST in "/Library/LaunchDaemons/homebrew.mxcl.dnscrypt-proxy".*.plist; do
  delete_service "$PLIST"
done

echo 'Finished uninstalling dnscrypt-proxy HA setup'