Merge pull request Place1#153 from DasSkelett/feature/envvar-comma-se…

…parator

cmd/serve/main.go

@@ -74,16 +74,6 @@ func (cmd *servecmd) Name() string {
 func (cmd *servecmd) Run() {
 	conf := cmd.ReadConfig()
 
-	if conf.VPN.CIDR == "0" {
-		conf.VPN.CIDR = ""
-	}
-	if conf.VPN.CIDRv6 == "0" {
-		conf.VPN.CIDRv6 = ""
-	}
-	if conf.DNS.Domain == "0" {
-		conf.DNS.Domain = ""
-	}
-
 	// Get the server's IP addresses within the VPN
 	var vpnip, vpnipv6 *net.IPNet
 	var err error
@@ -284,6 +274,7 @@ func (cmd *servecmd) Run() {
 	}
 }
 
+// ReadConfig reads the config file from disk if specified and overrides any env vars or cmdline options
 func (cmd *servecmd) ReadConfig() *config.AppConfig {
 	if cmd.ConfigFilePath != "" {
 		if b, err := ioutil.ReadFile(cmd.ConfigFilePath); err == nil {
@@ -335,6 +326,24 @@ func (cmd *servecmd) ReadConfig() *config.AppConfig {
 		cmd.AppConfig.WireGuard.PrivateKey = key.String()
 	}
 
+	// The empty string can be hard to pass through an env var, so we accept '0' too
+	if cmd.AppConfig.VPN.CIDR == "0" {
+		cmd.AppConfig.VPN.CIDR = ""
+	}
+	if cmd.AppConfig.VPN.CIDRv6 == "0" {
+		cmd.AppConfig.VPN.CIDRv6 = ""
+	}
+	if cmd.AppConfig.DNS.Domain == "0" {
+		cmd.AppConfig.DNS.Domain = ""
+	}
+	// kingpin only splits env vars by \n, let's split at commas as well
+	if len(cmd.AppConfig.VPN.AllowedIPs) == 1 {
+		cmd.AppConfig.VPN.AllowedIPs = strings.Split(cmd.AppConfig.VPN.AllowedIPs[0], ",")
+	}
+	if len(cmd.AppConfig.DNS.Upstream) == 1 {
+		cmd.AppConfig.DNS.Upstream = strings.Split(cmd.AppConfig.DNS.Upstream[0], ",")
+	}
+
 	return &cmd.AppConfig
 }
 

docs/2-configuration.md

@@ -16,6 +16,15 @@ wg genkey
 
 The config file format is `yaml` and an example is provided [below](#the-config-file-configyaml).
 
+The format for specifying multiple values for options that allow it is:
+* as commandline flags:
+  * repeat the flag (e.g. `--dns-upstream 2001:db8::1 --dns-upstream 192.0.2.1`)
+  * separate the values with a comma (e.g. `--dns-upstream 2001:db8::1,192.0.2.1`)
+* as environment variables:
+  * separate with a comma (e.g. `WG_DNS_UPSTREAM="2001:db8::1,192.0.2.1"`)
+  * separate with a new line char (e.g. `WG_DNS_UPSTREAM=$'2001:db8::1\n192.0.2.1'`)
+* in the config file as YAML list.
+
 Here's what you can configure:
 
 | Environment Variable       | CLI Flag                   | Config File Path       | Required | Default (docker)                             | Description                                                                                                                                                                        |
@@ -40,7 +49,7 @@ Here's what you can configure:
 | `WG_VPN_GATEWAY_INTERFACE` | `--vpn-gateway-interface`  | `vpn.gatewayInterface` |          | _default gateway interface (e.g. eth0)_      | The VPN gateway interface. VPN client traffic will be forwarded to this interface.                                                                                                 |
 | `WG_VPN_ALLOWED_IPS`       | `--vpn-allowed-ips`        | `vpn.allowedIPs`       |          | `0.0.0.0/0, ::/0`                            | Allowed IPs that clients may route through this VPN. This will be set in the client's WireGuard connection file and routing is also enforced by the server using iptables.         |
 | `WG_DNS_ENABLED`           | `--[no-]dns-enabled`       | `dns.enabled`          |          | `true`                                       | Enable/disable the embedded DNS proxy server. This is enabled by default and allows VPN clients to avoid DNS leaks by sending all DNS requests to wg-access-server itself.         |
-| `WG_DNS_UPSTREAM`          | `--dns-upstream`           | `dns.upstream`         |          | _resolvconf autodetection or Cloudflare DNS_ | The upstream DNS server to proxy DNS requests to. By default the host machine's resolveconf configuration is used to find it's upstream DNS server, with a fallback to Cloudflare. |
+| `WG_DNS_UPSTREAM`          | `--dns-upstream`           | `dns.upstream`         |          | _resolvconf autodetection or Cloudflare DNS_ | The upstream DNS servers to proxy DNS requests to. By default the host machine's resolveconf configuration is used to find its upstream DNS server, with a fallback to Cloudflare. |
 | `WG_DNS_DOMAIN`            | `--dns-domain`             | `dns.domain`           |          |                                              | A domain to serve configured devices authoritatively. Queries for names in the format <device>.<user>.<domain> will be answered with the device's IP addresses.                    |
 
 ## The Config File (config.yaml)