Require the external IP address

Dockerfile

@@ -47,7 +47,7 @@ RUN set -x && \
     rm -fr /tmp/* /var/tmp/*
 
 ENV DNSCRYPT_WRAPPER_GIT_URL https://github.com/jedisct1/dnscrypt-wrapper.git
-ENV DNSCRYPT_WRAPPER_GIT_BRANCH xchacha20
+ENV DNSCRYPT_WRAPPER_GIT_BRANCH xchacha20-stamps
 
 COPY queue.h /tmp
 

README.md

@@ -23,9 +23,11 @@ Let's pick `example.com` here.
 Download, create and initialize the container, once and for all:
 
     $ docker run --name=dnscrypt-server -p 443:443/udp -p 443:443/tcp --net=host \
-        jedisct1/unbound-dnscrypt-server init -N example.com
+        jedisct1/unbound-dnscrypt-server init -N example.com -L 192.168.1.1:443
 
-This will only accept connections via DNSCrypt on the standard port (443).
+This will only accept connections via DNSCrypt on the standard port (443). Replace
+`192.168.1.1` with the actual external IP address (not the internal Docker one)
+clients will connect to.
 
 `--net=host` provides the best network performance, but may have to be
 removed on some shared containers hosting services.

entrypoint.sh

@@ -6,17 +6,18 @@ action="$1"
 
 KEYS_DIR="/opt/dnscrypt-wrapper/etc/keys"
 
-# -N provider-name
+# -N provider-name -L external-ip-address:port
 
 init() {
     if [ $(is_initialized) = yes ]; then
         start
         exit $?
     fi
-    while getopts "h?N:" opt; do
+    while getopts "h?N:L:" opt; do
         case "$opt" in
             h|\?) usage ;;
             N) provider_name=$(echo "$OPTARG" | sed -e 's/^[ \t]*//' | tr A-Z a-z) ;;
+            L) listen_address=$(echo "$OPTARG" | sed -e 's/^[ \t]*//' | tr A-Z a-z) ;;
         esac
     done
     [ -z "$provider_name" ] && usage
@@ -26,8 +27,17 @@ init() {
         *) provider_name="2.dnscrypt-cert.${provider_name}"
     esac
     echo "Provider name: [$provider_name]"
+
+    [ -z "$listen_address" ] && usage
+    case "$listen_address" in
+        .*) usage ;;
+        0.*) echo "Do not use 0.0.0.0, use an actual external IP address" >&2 ; exit 1 ;;
+    esac
+    echo "Provider name: [$provider_name]"
     cd "$KEYS_DIR"
-    /opt/dnscrypt-wrapper/sbin/dnscrypt-wrapper --gen-provider-keypair | \
+    /opt/dnscrypt-wrapper/sbin/dnscrypt-wrapper \
+        --gen-provider-keypair --nolog --dnssec \
+        --provider-name="$provider_name" --listen-address="$listen_address" | \
         tee "${KEYS_DIR}/provider-info.txt"
     chmod 640 "${KEYS_DIR}/secret.key"
     chmod 644 "${KEYS_DIR}/public.key"
@@ -81,8 +91,9 @@ usage() {
 Commands
 ========
 
-* init -N <provider_name>: initialize the container for a new provider named <provider_name>
+* init -N <provider_name> -L <external ip>:<port>
-This is supposed to be called only once.
+initialize the container for a server accessible at ip <external ip> on port
+<port>, for a provider named <provider_name>. This is required only once.
 
 * start (default command): start the resolver and the dnscrypt server proxy.
 Ports 443/udp and 443/tcp have to be publicly exposed.

kube/dnscrypt-init-job.yml

@@ -10,7 +10,7 @@ spec:
       containers:
       - name: dnscrypt-init
         image: jedisct1/unbound-dnscrypt-server
-        command: ["/entrypoint.sh", "init",  "-N", "example.com"]
+        command: ["/entrypoint.sh", "init",  "-N", "example.com", "-L", "192.168.1.1:443"]
         volumeMounts:
           - name: dnscrypt-keys
             mountPath: /opt/dnscrypt-wrapper/etc/keys