src/core/identserver.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2005-2018 by the Quassel Project                        *
   3  *   devel@quassel-irc.org                                                 *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
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   8  *   (at your option) version 3.                                           *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
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  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
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  20
  21 #include <logger.h>
  22 #include <set>
  23
  24 #include "corenetwork.h"
  25 #include "identserver.h"
  26
  27 IdentServer::IdentServer(bool strict, QObject *parent) : QObject(parent), _strict(strict), _socketId(0), _requestId(0) {
  28     connect(&_server, SIGNAL(newConnection()), this, SLOT(incomingConnection()));
  29     connect(&_v6server, SIGNAL(newConnection()), this, SLOT(incomingConnection()));
  30 }
  31
  32 IdentServer::~IdentServer() = default;
  33
  34 bool IdentServer::startListening() {
  35     uint16_t port = 10113;
  36
  37     bool success = false;
  38     if (_v6server.listen(QHostAddress("::1"), port)) {
  39         quInfo() << qPrintable(
  40                 tr("Listening for identd clients on IPv6 %1 port %2")
  41                         .arg("::1")
  42                         .arg(_v6server.serverPort())
  43         );
  44
  45         success = true;
  46     }
  47
  48     if (_server.listen(QHostAddress("127.0.0.1"), port)) {
  49         success = true;
  50
  51         quInfo() << qPrintable(
  52                 tr("Listening for identd clients on IPv4 %1 port %2")
  53                         .arg("127.0.0.1")
  54                         .arg(_server.serverPort())
  55         );
  56     }
  57
  58     if (!success) {
  59         quError() << qPrintable(
  60                 tr("Identd could not open any network interfaces to listen on! No identd functionality will be available"));
  61     }
  62
  63     return success;
  64 }
  65
  66 void IdentServer::stopListening(const QString &msg) {
  67     bool wasListening = false;
  68     if (_server.isListening()) {
  69         wasListening = true;
  70         _server.close();
  71     }
  72     if (_v6server.isListening()) {
  73         wasListening = true;
  74         _v6server.close();
  75     }
  76     if (wasListening) {
  77         if (msg.isEmpty())
  78             quInfo() << "No longer listening for identd clients.";
  79         else
  80             quInfo() << qPrintable(msg);
  81     }
  82 }
  83
  84 void IdentServer::incomingConnection() {
  85     auto *server = qobject_cast<QTcpServer *>(sender());
  86     Q_ASSERT(server);
  87     while (server->hasPendingConnections()) {
  88         QTcpSocket *socket = server->nextPendingConnection();
  89         connect(socket, SIGNAL(readyRead()), this, SLOT(respond()));
  90     }
  91 }
  92
  93 void IdentServer::respond() {
  94     QTcpSocket *socket = qobject_cast<QTcpSocket *>(sender());
  95     Q_ASSERT(socket);
  96
  97     qint64 transactionId = _socketId;
  98
  99     if (socket->canReadLine()) {
 100         QByteArray query = socket->readLine();
 101         if (query.endsWith("\r\n"))
 102             query.chop(2);
 103         else if (query.endsWith("\n"))
 104             query.chop(1);
 105
 106         QList<QByteArray> split = query.split(',');
 107
 108         bool success = false;
 109
 110         quint16 localPort;
 111         if (!split.empty()) {
 112             localPort = split[0].trimmed().toUShort(&success, 10);
 113         }
 114
 115         Request request{socket, localPort, query, transactionId, _requestId++};
 116         if (!success) {
 117             responseUnavailable(request);
 118         } else if (!responseAvailable(request)) {
 119             if (hasSocketsBelowId(transactionId)) {
 120                 _requestQueue.emplace_back(request);
 121             } else {
 122                 responseUnavailable(request);
 123             }
 124         }
 125     }
 126 }
 127
 128 bool IdentServer::responseAvailable(Request request) {
 129     QString user;
 130     bool success = true;
 131     if (_connections.contains(request.localPort)) {
 132         user = _connections[request.localPort];
 133     } else {
 134         success = false;
 135     }
 136
 137     QString data;
 138     if (success) {
 139         data += request.query + " : USERID : Quassel : " + user + "\r\n";
 140
 141         request.socket->write(data.toUtf8());
 142         request.socket->flush();
 143         request.socket->close();
 144     }
 145     return success;
 146 }
 147
 148 void IdentServer::responseUnavailable(Request request) {
 149     QString data = request.query + " : ERROR : NO-USER\r\n";
 150
 151     request.socket->write(data.toUtf8());
 152     request.socket->flush();
 153     request.socket->close();
 154 }
 155
 156
 157 bool IdentServer::addSocket(const CoreIdentity *identity, const QHostAddress &localAddress, quint16 localPort,
 158                             const QHostAddress &peerAddress, quint16 peerPort, qint64 socketId) {
 159     Q_UNUSED(localAddress)
 160     Q_UNUSED(peerAddress)
 161     Q_UNUSED(peerPort)
 162
 163     const CoreNetwork *network = qobject_cast<CoreNetwork *>(sender());
 164     _connections[localPort] = network->coreSession()->strictCompliantIdent(identity);;
 165     processWaiting(socketId);
 166     return true;
 167 }
 168
 169
 170 bool IdentServer::removeSocket(const CoreIdentity *identity, const QHostAddress &localAddress, quint16 localPort,
 171                                const QHostAddress &peerAddress, quint16 peerPort, qint64 socketId) {
 172     Q_UNUSED(identity)
 173     Q_UNUSED(localAddress)
 174     Q_UNUSED(peerAddress)
 175     Q_UNUSED(peerPort)
 176
 177     _connections.remove(localPort);
 178     processWaiting(socketId);
 179     return true;
 180 }
 181
 182 qint64 IdentServer::addWaitingSocket() {
 183     qint64 newSocketId = _socketId++;
 184     _waiting.push_back(newSocketId);
 185     return newSocketId;
 186 }
 187
 188 bool IdentServer::hasSocketsBelowId(qint64 id) {
 189     return std::any_of(_waiting.begin(), _waiting.end(), [=](qint64 socketId) {
 190         return socketId <= id;
 191     });
 192 }
 193
 194 void IdentServer::removeWaitingSocket(qint64 socketId) {
 195     _waiting.remove(socketId);
 196 }
 197
 198 void IdentServer::processWaiting(qint64 socketId) {
 199     qint64 lowestSocketId = std::numeric_limits<qint64 >::max();
 200     for (qint64 id : _waiting) {
 201         if (id < lowestSocketId) {
 202             lowestSocketId = id;
 203         }
 204     }
 205     removeWaitingSocket(socketId);
 206     _requestQueue.remove_if([=](Request request) {
 207         if (request.transactionId < lowestSocketId) {
 208             responseUnavailable(request);
 209             return true;
 210         } else if (request.transactionId > socketId) {
 211             return responseAvailable(request);
 212         } else {
 213             return false;
 214         }
 215     });
 216 }
 217
 218 bool operator==(const Request &a, const Request &b) {
 219     return a.requestId == b.requestId;
 220 }