1 files changed, 125 insertions, 0 deletions
diff --git a/conf/writer.go b/conf/writer.go
new file mode 100644
index 00000000..642d14a7
--- /dev/null
+++ b/conf/writer.go
@@ -0,0 +1,125 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
+ */
+
+package conf
+
+import (
+	"errors"
+	"fmt"
+	"net"
+	"strings"
+)
+
+func (conf *Config) ToWgQuick() string {
+	var output strings.Builder
+	output.WriteString("[Interface]\n")
+
+	output.WriteString(fmt.Sprintf("PrivateKey = %s\n", conf.Interface.PrivateKey.String()))
+
+	if conf.Interface.ListenPort > 0 {
+		output.WriteString(fmt.Sprintf("ListenPort = %d\n", conf.Interface.ListenPort))
+	}
+
+	if len(conf.Interface.Addresses) > 0 {
+		addrStrings := make([]string, len(conf.Interface.Addresses))
+		for i, address := range conf.Interface.Addresses {
+			addrStrings[i] = address.String()
+		}
+		output.WriteString(fmt.Sprintf("Address = %s\n", strings.Join(addrStrings[:], ", ")))
+	}
+
+	if len(conf.Interface.Dns) > 0 {
+		addrStrings := make([]string, len(conf.Interface.Dns))
+		for i, address := range conf.Interface.Dns {
+			addrStrings[i] = address.String()
+		}
+		output.WriteString(fmt.Sprintf("DNS = %s\n", strings.Join(addrStrings[:], ", ")))
+	}
+
+	if conf.Interface.Mtu > 0 {
+		output.WriteString(fmt.Sprintf("MTU = %d\n", conf.Interface.Mtu))
+	}
+
+	for _, peer := range conf.Peers {
+		output.WriteString("\n[Peer]\n")
+
+		output.WriteString(fmt.Sprintf("PublicKey = %s\n", peer.PublicKey.String()))
+
+		if !peer.PresharedKey.IsZero() {
+			output.WriteString(fmt.Sprintf("PresharedKey = %s\n", peer.PresharedKey.String()))
+		}
+
+		if len(peer.AllowedIPs) > 0 {
+			addrStrings := make([]string, len(peer.AllowedIPs))
+			for i, address := range peer.AllowedIPs {
+				addrStrings[i] = address.String()
+			}
+			output.WriteString(fmt.Sprintf("AllowedIPs = %s\n", strings.Join(addrStrings[:], ", ")))
+		}
+
+		if !peer.Endpoint.IsEmpty() {
+			output.WriteString(fmt.Sprintf("Endpoint = %s\n", peer.Endpoint.String()))
+		}
+
+		if peer.PersistentKeepalive > 0 {
+			output.WriteString(fmt.Sprintf("PersistentKeepalive = %d\n", peer.PersistentKeepalive))
+		}
+	}
+	return output.String()
+}
+
+func (conf *Config) ToUAPI() (string, error) {
+	var output strings.Builder
+	output.WriteString(fmt.Sprintf("private_key=%s\n", conf.Interface.PrivateKey.HexString()))
+
+	if conf.Interface.ListenPort > 0 {
+		output.WriteString(fmt.Sprintf("listen_port=%d\n", conf.Interface.ListenPort))
+	}
+
+	if len(conf.Peers) > 0 {
+		output.WriteString("replace_peers=true\n")
+	}
+
+	for _, peer := range conf.Peers {
+		output.WriteString(fmt.Sprintf("public_key=%s\n", peer.PublicKey.HexString()))
+
+		if !peer.PresharedKey.IsZero() {
+			output.WriteString(fmt.Sprintf("preshared_key = %s\n", peer.PresharedKey.String()))
+		}
+
+		if !peer.Endpoint.IsEmpty() {
+			ips, err := net.LookupIP(peer.Endpoint.Host)
+			if err != nil {
+				return "", err
+			}
+			var ip net.IP
+			for _, iterip := range ips {
+				iterip = iterip.To4()
+				if iterip != nil {
+					ip = iterip
+					break
+				}
+				if ip == nil {
+					ip = iterip
+				}
+			}
+			if ip == nil {
+				return "", errors.New("Unable to resolve IP address of endpoint")
+			}
+			resolvedEndpoint := Endpoint{ip.String(), peer.Endpoint.Port}
+			output.WriteString(fmt.Sprintf("endpoint=%s\n", resolvedEndpoint.String()))
+		}
+
+		output.WriteString(fmt.Sprintf("persistent_keepalive_interval=%d\n", peer.PersistentKeepalive))
+
+		if len(peer.AllowedIPs) > 0 {
+			output.WriteString("replace_allowed_ips=true\n")
+			for _, address := range peer.AllowedIPs {
+				output.WriteString(fmt.Sprintf("allowed_ip=%s\n", address.String()))
+			}
+		}
+	}
+	return output.String(), nil
+}