dns resolvers changing using environment variables

3proxy.cfg

@@ -4,11 +4,12 @@ config /etc/3proxy/3proxy.cfg
 # you may use system to execute some external command if proxy starts
 system "echo `which 3proxy`': Starting 3proxy'"
 
-# We can configure nservers to avoid unsafe gethostbyname() usage
+# We can configure nservers to avoid unsafe gethostbyname() usage (max 5 servers)
+#NSERVER1
+#NSERVER2
 nserver 1.0.0.1
 nserver 1.1.1.1
 nserver 8.8.4.4
-nserver 8.8.8.8
 
 # nscache is good to save speed, traffic and bandwidth
 nscache 65536

CHANGELOG.md

@@ -4,6 +4,12 @@ All notable changes to this package will be documented in this file.
 
 The format is based on [Keep a Changelog][keepachangelog] and this project adheres to [Semantic Versioning][semver].
 
+## v1.6.0
+
+### Added
+
+- Possibility of changing DNS resolvers using environment variables `NAME_SERVER_1` (primary) and `NAME_SERVER_2` (secondary)
+
 ## v1.5.0
 
 ### Fixed

Dockerfile

@@ -6,7 +6,7 @@ ARG Z3PROXY_VERSION=0.9.4
 
 # Fetch 3proxy sources
 RUN set -x \
-    && git clone --branch "${Z3PROXY_VERSION}" https://github.com/z3APA3A/3proxy.git /tmp/3proxy
+    && git -c advice.detachedHead=false clone --depth 1 --branch "${Z3PROXY_VERSION}" https://github.com/z3APA3A/3proxy.git /tmp/3proxy
 
 WORKDIR /tmp/3proxy
 

README.md

@@ -31,10 +31,12 @@ All supported image tags [can be found here][link_docker_tags].
 
 ## Supported environment variables
 
-| Variable name    | Description            | Example    |
+| Variable name    | Description                         | Example                |
-|------------------|------------------------|------------|
+|------------------|-------------------------------------|------------------------|
-| `PROXY_LOGIN`    | Authorization login    | `username` |
+| `PROXY_LOGIN`    | Authorization login                 | `username`             |
-| `PROXY_PASSWORD` | Authorization password | `password` |
+| `PROXY_PASSWORD` | Authorization password              | `password`             |
+| `NAME_SERVER_1`  | Primary nameserver (dns resolver)   | `8.8.8.8`              |
+| `NAME_SERVER_2`  | Secondary nameserver (dns resolver) | `2001:4860:4860::8844` |
 
 ## How can I use this?
 
@@ -47,7 +49,7 @@ $ docker run --rm -d \
     tarampampam/3proxy:latest
 ```
 
-Or with auth settings:
+Or with auth & resolver settings:
 
 ```bash
 $ docker run --rm -d \
@@ -55,6 +57,7 @@ $ docker run --rm -d \
     -p "1080:1080/tcp" \
     -e "PROXY_LOGIN=evil" \
     -e "PROXY_PASSWORD=live" \
+    -e "NAME_SERVER_1=2001:4860:4860::8888" \
     tarampampam/3proxy:latest
 ```
 

docker-entrypoint.sh

@@ -3,10 +3,22 @@ set -e
 
 PROXY_LOGIN=${PROXY_LOGIN:-} # string
 PROXY_PASSWORD=${PROXY_PASSWORD:-} # string
+NAME_SERVER_1=${NAME_SERVER_1:-} # string
+NAME_SERVER_2=${NAME_SERVER_2:-} # string
 
 if [ -n "$PROXY_LOGIN" ] && [ -n "$PROXY_PASSWORD" ]; then
   echo "$0: setup '${PROXY_LOGIN}:${PROXY_PASSWORD}' as proxy user";
   sed -i "s~#AUTH_SETTINGS~users ${PROXY_LOGIN}:CL:${PROXY_PASSWORD}\nauth strong\nallow ${PROXY_LOGIN}~" /etc/3proxy/3proxy.cfg
 fi;
 
+if [ -n "$NAME_SERVER_1" ]; then
+  echo "$0: setup '${NAME_SERVER_1}' as the first nameserver";
+  sed -i "s~#NSERVER1~nserver ${NAME_SERVER_1}~" /etc/3proxy/3proxy.cfg
+fi;
+
+if [ -n "$NAME_SERVER_2" ]; then
+  echo "$0: setup '${NAME_SERVER_2}' as the second nameserver";
+  sed -i "s~#NSERVER2~nserver ${NAME_SERVER_2}~" /etc/3proxy/3proxy.cfg
+fi;
+
 exec "$@"