Remove sloppy java with enterprise java horrors

Since the amount of mind numbing boiler plate has been increased, this
must be the proper way to do things.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

4 files changed, 147 insertions, 95 deletions

diff --git a/app/src/main/java/com/wireguard/android/backend/GoBackend.java b/app/src/main/java/com/wireguard/android/backend/GoBackend.java
index 6467ba2c..7b397f05 100644
--- a/app/src/main/java/com/wireguard/android/backend/GoBackend.java
+++ b/app/src/main/java/com/wireguard/android/backend/GoBackend.java
@@ -21,7 +21,6 @@ import java.net.InetSocketAddress;
 import java.util.Collections;
 import java.util.Formatter;
 import java.util.Set;
-import java.util.Vector;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 
@@ -127,16 +126,15 @@ public final class GoBackend implements Backend {
 
     private String parseEndpoint(String string) throws Exception {
         String[] part;
-        if (string.charAt(0) == '[') { // ipv6
+        if (string.charAt(0) == '[') {
             int end = string.indexOf(']');
-            if (end == -1 || string.charAt(end+1) != ':')
+            if (end == -1 || end >= string.length() - 2 || string.charAt(end + 1) != ':')
                 throw new Exception("Invalid endpoint " + string);
 
             part = new String[2];
             part[0] = string.substring(1, end);
             part[1] = string.substring(end + 2);
-            Log.d(TAG, "PP " + part[0] + " " + part[1]);
-        } else { // ipv4
+        } else {
             part = string.split(":", 2);
         }
 
@@ -144,7 +142,13 @@ public final class GoBackend implements Backend {
             throw new Exception("Invalid endpoint " + string);
 
         InetAddress address = InetAddress.getByName(part[0]);
-        int port = Integer.valueOf(part[1]);
+        int port = -1;
+        try {
+            port = Integer.parseInt(part[1], 10);
+        } catch (Exception e) {
+        }
+        if (port < 1)
+            throw new Exception("Invalid endpoint port " + part[1]);
         InetSocketAddress socketAddress = new InetSocketAddress(address, port);
         if (socketAddress.getAddress() instanceof Inet4Address)
             return socketAddress.getAddress().getHostAddress() + ":" + socketAddress.getPort();
@@ -152,31 +156,23 @@ public final class GoBackend implements Backend {
             return "[" + socketAddress.getAddress().getHostAddress() + "]:" + socketAddress.getPort();
     }
 
-    private Vector<Pair<String, Integer>> parseAllowedIps(String string) throws Exception {
-        Vector<Pair<String, Integer>> ret = new Vector<>();
-        for (final String allowedIp : string.split(" *, *")) {
-            String[] part = allowedIp.split("/", 2);
-            if (part.length > 2)
-                throw new Exception("Invalid allowed ips string " + string);
-
+    private Pair<String, Integer> parseAddressWithCidr(String in) {
+        int cidr = -1;
+        String addr = in;
+        int slash = in.lastIndexOf('/');
+        if (slash != -1 && slash < in.length() - 1) {
             try {
-                InetAddress address = InetAddress.getByName(part[0]);
-                int networkPrefixLength;
-                if (part.length == 2) {
-                    networkPrefixLength = Integer.valueOf(part[1]);
-                    if (networkPrefixLength < 0 || networkPrefixLength > 128
-                            || (address instanceof Inet4Address && networkPrefixLength > 32))
-                        throw new Exception();
-                } else {
-                    networkPrefixLength = (address instanceof Inet4Address) ? 32 : 128;
-                }
-
-                ret.add(new Pair<>(address.getHostAddress(), networkPrefixLength));
+                cidr = Integer.parseInt(in.substring(slash + 1), 10);
+                addr = in.substring(0, slash);
             } catch (Exception e) {
-                throw new Exception("Invalid allowed ips string " + string);
             }
         }
-        return ret;
+        boolean isV6 = addr.indexOf(':') != -1;
+        if (isV6 && (cidr > 128 || cidr < 0))
+            cidr = 128;
+        else if (!isV6 && (cidr > 32 || cidr < 0))
+            cidr = 32;
+        return new Pair<>(addr, cidr);
     }
 
     private void setStateInternal(final Tunnel tunnel, final Config config, final State state)
@@ -216,15 +212,13 @@ public final class GoBackend implements Backend {
                     fmt.format("public_key=%s\n", KeyEncoding.keyToHex(KeyEncoding.keyFromBase64(peer.getPublicKey())));
                 if (peer.getPreSharedKey() != null)
                     fmt.format("preshared_key=%s\n", KeyEncoding.keyToHex(KeyEncoding.keyFromBase64(peer.getPreSharedKey())));
-                if (peer.getEndpoint() != null) {
+                if (peer.getEndpoint() != null)
                     fmt.format("endpoint=%s\n", parseEndpoint(peer.getEndpoint()));
-                }
                 if (peer.getPersistentKeepalive() != null)
-                    fmt.format("persistent_keepalive_interval=%d\n", Integer.parseInt(peer.getPersistentKeepalive()));
-                if (peer.getAllowedIPs() != null) {
-                    for (final Pair<String, Integer> allowedIp : parseAllowedIps(peer.getAllowedIPs())) {
-                        fmt.format("allowed_ip=%s\n", allowedIp.first + "/" + allowedIp.second);
-                    }
+                    fmt.format("persistent_keepalive_interval=%d\n", Integer.parseInt(peer.getPersistentKeepalive(), 10));
+                for (final String addr : peer.getAllowedIPs()) {
+                    final Pair<String, Integer> addressCidr = parseAddressWithCidr(addr);
+                    fmt.format("allowed_ip=%s\n", addressCidr.first + "/" + addressCidr.second);
                 }
             }
 
@@ -232,22 +226,21 @@ public final class GoBackend implements Backend {
             VpnService.Builder builder = service.getBuilder();
             builder.setSession(tunnel.getName());
 
-            for (final String addressString : config.getInterface().getAddress().split(" *, *")) {
-                InetAddress address = InetAddress.getByName(addressString);
-                builder.addAddress(address.getHostAddress(), (address instanceof Inet4Address) ? 32 : 128);
+            for (final String addr : config.getInterface().getAddresses()) {
+                final Pair<String, Integer> addressCidr = parseAddressWithCidr(addr);
+                final InetAddress address = InetAddress.getByName(addressCidr.first);
+                builder.addAddress(address.getHostAddress(), addressCidr.second);
             }
 
-            if (config.getInterface().getDns() != null) {
-                for (final String dnsString : config.getInterface().getDns().split(" *, *")) {
-                    builder.addDnsServer(InetAddress.getByName(dnsString).getHostAddress());
-                }
+            for (final String addr : config.getInterface().getDnses()) {
+                final InetAddress address = InetAddress.getByName(addr);
+                builder.addDnsServer(address.getHostAddress());
             }
 
             for (final Peer peer : config.getPeers()) {
-                if (peer.getAllowedIPs() != null) {
-                    for (final Pair<String, Integer> allowedIp : parseAllowedIps(peer.getAllowedIPs())) {
-                        builder.addRoute(allowedIp.first, allowedIp.second);
-                    }
+                for (final String addr : peer.getAllowedIPs()) {
+                    final Pair<String, Integer> addressCidr = parseAddressWithCidr(addr);
+                    builder.addRoute(addressCidr.first, addressCidr.second);
                 }
             }
 
diff --git a/app/src/main/java/com/wireguard/config/Attribute.java b/app/src/main/java/com/wireguard/config/Attribute.java
index ee7fea33..50dbc38d 100644
--- a/app/src/main/java/com/wireguard/config/Attribute.java
+++ b/app/src/main/java/com/wireguard/config/Attribute.java
@@ -1,5 +1,7 @@
 package com.wireguard.config;
 
+import android.text.TextUtils;
+
 import java.util.HashMap;
 import java.util.Map;
 import java.util.regex.Matcher;
@@ -43,10 +45,22 @@ enum Attribute {
         return KEY_MAP.get(SEPARATOR_PATTERN.split(line)[0]);
     }
 
+    public static String listToString(final String[] list) {
+        return TextUtils.join(", ", list);
+    }
+
+    public static String[] stringToList(final String string) {
+        return string.trim().split("\\s*,\\s*");
+    }
+
     public String composeWith(final Object value) {
         return String.format("%s = %s%n", token, value);
     }
 
+    public String composeWith(final String[] value) {
+        return String.format("%s = %s%n", token, listToString(value));
+    }
+
     public String getToken() {
         return token;
     }
@@ -55,4 +69,9 @@ enum Attribute {
         final Matcher matcher = pattern.matcher(line);
         return matcher.matches() ? matcher.group(1) : null;
     }
+
+    public String[] parseList(final CharSequence line) {
+        final Matcher matcher = pattern.matcher(line);
+        return matcher.matches() ? stringToList(matcher.group(1)) : null;
+    }
 }
diff --git a/app/src/main/java/com/wireguard/config/Interface.java b/app/src/main/java/com/wireguard/config/Interface.java
index b13f78a0..faf70cf6 100644
--- a/app/src/main/java/com/wireguard/config/Interface.java
+++ b/app/src/main/java/com/wireguard/config/Interface.java
@@ -26,20 +26,21 @@ public class Interface extends BaseObservable implements Parcelable {
         }
     };
 
-    private String address;
-    private String dns;
+    private String[] addressList;
+    private String[] dnsList;
     private Keypair keypair;
     private String listenPort;
     private String mtu;
     private String privateKey;
 
     public Interface() {
-        // Do nothing.
+        addressList = new String[0];
+        dnsList = new String[0];
     }
 
     private Interface(final Parcel in) {
-        address = in.readString();
-        dns = in.readString();
+        addressList = in.createStringArray();
+        dnsList = in.createStringArray();
         listenPort = in.readString();
         mtu = in.readString();
         setPrivateKey(in.readString());
@@ -58,13 +59,23 @@ public class Interface extends BaseObservable implements Parcelable {
     }
 
     @Bindable
-    public String getAddress() {
-        return address;
+    public String getAddressString() {
+        return Attribute.listToString(addressList);
     }
 
     @Bindable
-    public String getDns() {
-        return dns;
+    public String[] getAddresses() {
+        return addressList;
+    }
+
+    @Bindable
+    public String getDnsString() {
+        return Attribute.listToString(dnsList);
+    }
+
+    @Bindable
+    public String[] getDnses() {
+        return dnsList;
     }
 
     @Bindable
@@ -90,9 +101,9 @@ public class Interface extends BaseObservable implements Parcelable {
     public void parse(final String line) {
         final Attribute key = Attribute.match(line);
         if (key == Attribute.ADDRESS)
-            addAddress(key.parse(line));
+            addAddresses(key.parseList(line));
         else if (key == Attribute.DNS)
-            addDns(key.parse(line));
+            addDnses(key.parseList(line));
         else if (key == Attribute.LISTEN_PORT)
             setListenPort(key.parse(line));
         else if (key == Attribute.MTU)
@@ -103,32 +114,44 @@ public class Interface extends BaseObservable implements Parcelable {
             throw new IllegalArgumentException(line);
     }
 
-    public void addAddress(String address) {
-        if (address != null && address.isEmpty())
-            address = null;
-        setAddress((this.address == null) ? address
-                : this.address + ", " + address);
+    public void addAddresses(String[] addresses) {
+        if (addresses == null || addresses.length == 0)
+            return;
+        String[] both = new String[addresses.length + this.addressList.length];
+        System.arraycopy(this.addressList, 0, both, 0, this.addressList.length);
+        System.arraycopy(addresses, 0, both, this.addressList.length, addresses.length);
+        setAddresses(both);
+    }
+
+    public void setAddresses(String[] addresses) {
+        if (addresses == null)
+            addresses = new String[0];
+        this.addressList = addresses;
+        notifyPropertyChanged(BR.addresses);
+    }
+
+    public void setAddressString(String addressString) {
+        setAddresses(Attribute.stringToList(addressString));
     }
 
-    public void setAddress(String address) {
-        if (address != null && address.isEmpty())
-            address = null;
-        this.address = address;
-        notifyPropertyChanged(BR.address);
+    public void addDnses(String[] dnses) {
+        if (dnses == null || dnses.length == 0)
+            return;
+        String[] both = new String[dnses.length + this.dnsList.length];
+        System.arraycopy(this.dnsList, 0, both, 0, this.dnsList.length);
+        System.arraycopy(dnses, 0, both, this.dnsList.length, dnses.length);
+        setDnses(both);
     }
 
-    public void addDns(String dns) {
-        if (dns != null && dns.isEmpty())
-            dns = null;
-        setDns((this.dns == null) ? dns
-                : this.dns + ", " + dns);
+    public void setDnses(String[] dnses) {
+        if (dnses == null)
+            dnses = new String[0];
+        this.dnsList = dnses;
+        notifyPropertyChanged(BR.dnses);
     }
 
-    public void setDns(String dns) {
-        if (dns != null && dns.isEmpty())
-            dns = null;
-        this.dns = dns;
-        notifyPropertyChanged(BR.dns);
+    public void setDnsString(String dnsString) {
+        setDnses(Attribute.stringToList(dnsString));
     }
 
     public void setListenPort(String listenPort) {
@@ -165,10 +188,10 @@ public class Interface extends BaseObservable implements Parcelable {
     @Override
     public String toString() {
         final StringBuilder sb = new StringBuilder().append("[Interface]\n");
-        if (address != null)
-            sb.append(Attribute.ADDRESS.composeWith(address));
-        if (dns != null)
-            sb.append(Attribute.DNS.composeWith(dns));
+        if (addressList != null && addressList.length > 0)
+            sb.append(Attribute.ADDRESS.composeWith(addressList));
+        if (dnsList != null && dnsList.length > 0)
+            sb.append(Attribute.DNS.composeWith(dnsList));
         if (listenPort != null)
             sb.append(Attribute.LISTEN_PORT.composeWith(listenPort));
         if (mtu != null)
@@ -180,8 +203,8 @@ public class Interface extends BaseObservable implements Parcelable {
 
     @Override
     public void writeToParcel(final Parcel dest, final int flags) {
-        dest.writeString(address);
-        dest.writeString(dns);
+        dest.writeStringArray(addressList);
+        dest.writeStringArray(dnsList);
         dest.writeString(listenPort);
         dest.writeString(mtu);
         dest.writeString(privateKey);
diff --git a/app/src/main/java/com/wireguard/config/Peer.java b/app/src/main/java/com/wireguard/config/Peer.java
index ac576d3e..954a220a 100644
--- a/app/src/main/java/com/wireguard/config/Peer.java
+++ b/app/src/main/java/com/wireguard/config/Peer.java
@@ -24,18 +24,18 @@ public class Peer extends BaseObservable implements Parcelable {
         }
     };
 
-    private String allowedIPs;
+    private String[] allowedIPList;
     private String endpoint;
     private String persistentKeepalive;
     private String preSharedKey;
     private String publicKey;
 
     public Peer() {
-        // Do nothing.
+        allowedIPList = new String[0];
     }
 
     private Peer(final Parcel in) {
-        allowedIPs = in.readString();
+        allowedIPList = in.createStringArray();
         endpoint = in.readString();
         persistentKeepalive = in.readString();
         preSharedKey = in.readString();
@@ -51,9 +51,13 @@ public class Peer extends BaseObservable implements Parcelable {
         return 0;
     }
 
+
+    @Bindable
+    public String getAllowedIPsString() { return Attribute.listToString(allowedIPList); }
+
     @Bindable
-    public String getAllowedIPs() {
-        return allowedIPs;
+    public String[] getAllowedIPs() {
+        return allowedIPList;
     }
 
     @Bindable
@@ -79,7 +83,7 @@ public class Peer extends BaseObservable implements Parcelable {
     public void parse(final String line) {
         final Attribute key = Attribute.match(line);
         if (key == Attribute.ALLOWED_IPS)
-            setAllowedIPs(key.parse(line));
+            addAllowedIPs(key.parseList(line));
         else if (key == Attribute.ENDPOINT)
             setEndpoint(key.parse(line));
         else if (key == Attribute.PERSISTENT_KEEPALIVE)
@@ -92,13 +96,26 @@ public class Peer extends BaseObservable implements Parcelable {
             throw new IllegalArgumentException(line);
     }
 
-    public void setAllowedIPs(String allowedIPs) {
-        if (allowedIPs != null && allowedIPs.isEmpty())
-            allowedIPs = null;
-        this.allowedIPs = allowedIPs;
+    public void addAllowedIPs(String[] allowedIPs) {
+        if (allowedIPs == null || allowedIPs.length == 0)
+            return;
+        String[] both = new String[allowedIPs.length + this.allowedIPList.length];
+        System.arraycopy(this.allowedIPList, 0, both, 0, this.allowedIPList.length);
+        System.arraycopy(allowedIPs, 0, both, this.allowedIPList.length, allowedIPs.length);
+        setAllowedIPs(both);
+    }
+
+    public void setAllowedIPs(String[] allowedIPs) {
+        if (allowedIPs == null)
+            allowedIPs = new String[0];
+        this.allowedIPList = allowedIPs;
         notifyPropertyChanged(BR.allowedIPs);
     }
 
+    public void setAllowedIPsString(String allowedIPsString) {
+        setAllowedIPs(Attribute.stringToList(allowedIPsString));
+    }
+
     public void setEndpoint(String endpoint) {
         if (endpoint != null && endpoint.isEmpty())
             endpoint = null;
@@ -130,8 +147,8 @@ public class Peer extends BaseObservable implements Parcelable {
     @Override
     public String toString() {
         final StringBuilder sb = new StringBuilder().append("[Peer]\n");
-        if (allowedIPs != null)
-            sb.append(Attribute.ALLOWED_IPS.composeWith(allowedIPs));
+        if (allowedIPList != null)
+            sb.append(Attribute.ALLOWED_IPS.composeWith(allowedIPList));
         if (endpoint != null)
             sb.append(Attribute.ENDPOINT.composeWith(endpoint));
         if (persistentKeepalive != null)
@@ -145,7 +162,7 @@ public class Peer extends BaseObservable implements Parcelable {
 
     @Override
     public void writeToParcel(final Parcel dest, final int flags) {
-        dest.writeString(allowedIPs);
+        dest.writeStringArray(allowedIPList);
         dest.writeString(endpoint);
         dest.writeString(persistentKeepalive);
         dest.writeString(preSharedKey);