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/*
* Copyright © 2017-2018 WireGuard LLC. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/
package com.wireguard.config;
import android.support.annotation.Nullable;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Objects;
import java.util.Set;
/**
* Represents the contents of a wg-quick configuration file, made up of one or more "Interface"
* sections (combined together), and zero or more "Peer" sections (treated individually).
* <p>
* Instances of this class are immutable.
*/
public final class Config {
private final Interface interfaze;
private final List<Peer> peers;
private Config(final Builder builder) {
interfaze = Objects.requireNonNull(builder.interfaze, "An [Interface] section is required");
// Defensively copy to ensure immutability even if the Builder is reused.
peers = Collections.unmodifiableList(new ArrayList<>(builder.peers));
}
/**
* Parses an series of "Interface" and "Peer" sections into a {@code Config}. Throws
* {@link ParseException} if the input is not well-formed or contains unparseable sections.
*
* @param stream a stream of UTF-8 text that is interpreted as a WireGuard configuration file
* @return a {@code Config} instance representing the supplied configuration
*/
public static Config parse(final InputStream stream) throws IOException, ParseException {
final Builder builder = new Builder();
try (final BufferedReader reader = new BufferedReader(new InputStreamReader(stream))) {
final Collection<String> interfaceLines = new ArrayList<>();
final Collection<String> peerLines = new ArrayList<>();
boolean inInterfaceSection = false;
boolean inPeerSection = false;
@Nullable String line;
while ((line = reader.readLine()) != null) {
final int commentIndex = line.indexOf('#');
if (commentIndex != -1)
line = line.substring(0, commentIndex);
line = line.trim();
if (line.isEmpty())
continue;
if (line.startsWith("[")) {
// Consume all [Peer] lines read so far.
if (inPeerSection) {
builder.parsePeer(peerLines);
peerLines.clear();
}
if ("[Interface]".equalsIgnoreCase(line)) {
inInterfaceSection = true;
inPeerSection = false;
} else if ("[Peer]".equalsIgnoreCase(line)) {
inInterfaceSection = false;
inPeerSection = true;
} else {
throw new ParseException("top level", line, "Unknown section name");
}
} else if (inInterfaceSection) {
interfaceLines.add(line);
} else if (inPeerSection) {
peerLines.add(line);
} else {
throw new ParseException("top level", line, "Expected [Interface] or [Peer]");
}
}
if (inPeerSection)
builder.parsePeer(peerLines);
else if (!inInterfaceSection)
throw new ParseException("top level", "", "Empty configuration");
// Combine all [Interface] sections in the file.
builder.parseInterface(interfaceLines);
}
return builder.build();
}
@Override
public boolean equals(final Object obj) {
if (!(obj instanceof Config))
return false;
final Config other = (Config) obj;
return interfaze.equals(other.interfaze) && peers.equals(other.peers);
}
/**
* Returns the interface section of the configuration.
*
* @return the interface configuration
*/
public Interface getInterface() {
return interfaze;
}
/**
* Returns a list of the configuration's peer sections.
*
* @return a list of {@link Peer}s
*/
public List<Peer> getPeers() {
return peers;
}
@Override
public int hashCode() {
return 31 * interfaze.hashCode() + peers.hashCode();
}
/**
* Converts the {@code Config} into a string suitable for debugging purposes. The {@code Config}
* is identified by its interface's public key and the number of peers it has.
*
* @return a concise single-line identifier for the {@code Config}
*/
@Override
public String toString() {
return "(Config " + interfaze + " (" + peers.size() + " peers))";
}
/**
* Converts the {@code Config} into a string suitable for use as a {@code wg-quick}
* configuration file.
*
* @return the {@code Config} represented as one [Interface] and zero or more [Peer] sections
*/
public String toWgQuickString() {
final StringBuilder sb = new StringBuilder();
sb.append("[Interface]\n").append(interfaze.toWgQuickString());
for (final Peer peer : peers)
sb.append("\n[Peer]\n").append(peer.toWgQuickString());
return sb.toString();
}
/**
* Serializes the {@code Config} for use with the WireGuard cross-platform userspace API.
*
* @return the {@code Config} represented as a series of "key=value" lines
*/
public String toWgUserspaceString() {
final StringBuilder sb = new StringBuilder();
sb.append(interfaze.toWgUserspaceString());
sb.append("replace_peers=true\n");
for (final Peer peer : peers)
sb.append(peer.toWgUserspaceString());
return sb.toString();
}
@SuppressWarnings("UnusedReturnValue")
public static final class Builder {
// Defaults to an empty set.
private final Set<Peer> peers = new LinkedHashSet<>();
// No default; must be provided before building.
@Nullable private Interface interfaze;
public Builder addPeer(final Peer peer) {
peers.add(peer);
return this;
}
public Builder addPeers(final Collection<Peer> peers) {
this.peers.addAll(peers);
return this;
}
public Config build() {
return new Config(this);
}
public Builder parseInterface(final Iterable<? extends CharSequence> lines) throws ParseException {
return setInterface(Interface.parse(lines));
}
public Builder parsePeer(final Iterable<? extends CharSequence> lines) throws ParseException {
return addPeer(Peer.parse(lines));
}
public Builder setInterface(final Interface interfaze) {
this.interfaze = interfaze;
return this;
}
}
}
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