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  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) version 3.                                           *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.         *
  19  ***************************************************************************/
  20
  21 #include <limits>
  22
  23 #include "corenetwork.h"
  24 #include "identserver.h"
  25 #include "logger.h"
  26
  27 IdentServer::IdentServer(bool strict, QObject *parent)
  28     : QObject(parent)
  29     , _strict(strict)
  30 {
  31     connect(&_server, SIGNAL(newConnection()), this, SLOT(incomingConnection()));
  32     connect(&_v6server, SIGNAL(newConnection()), this, SLOT(incomingConnection()));
  33 }
  34
  35
  36 bool IdentServer::startListening()
  37 {
  38     uint16_t port = Quassel::optionValue("ident-port").toUShort();
  39
  40     bool success = false;
  41     if (_v6server.listen(QHostAddress("::1"), port)) {
  42         quInfo() << qPrintable(
  43                 tr("Listening for identd clients on IPv6 %1 port %2")
  44                         .arg("::1")
  45                         .arg(_v6server.serverPort())
  46         );
  47
  48         success = true;
  49     }
  50
  51     if (_server.listen(QHostAddress("127.0.0.1"), port)) {
  52         quInfo() << qPrintable(
  53                 tr("Listening for identd clients on IPv4 %1 port %2")
  54                         .arg("127.0.0.1")
  55                         .arg(_server.serverPort())
  56         );
  57
  58         success = true;
  59     }
  60
  61     if (!success) {
  62         quError() << qPrintable(tr("Identd could not open any network interfaces to listen on! No identd functionality will be available"));
  63     }
  64
  65     return success;
  66 }
  67
  68
  69 void IdentServer::stopListening(const QString &msg)
  70 {
  71     bool wasListening = false;
  72
  73     if (_server.isListening()) {
  74         wasListening = true;
  75         _server.close();
  76     }
  77     if (_v6server.isListening()) {
  78         wasListening = true;
  79         _v6server.close();
  80     }
  81
  82     if (wasListening) {
  83         if (msg.isEmpty())
  84             quInfo() << "No longer listening for identd clients.";
  85         else
  86             quInfo() << qPrintable(msg);
  87     }
  88 }
  89
  90
  91 void IdentServer::incomingConnection()
  92 {
  93     auto server = qobject_cast<QTcpServer *>(sender());
  94     Q_ASSERT(server);
  95     while (server->hasPendingConnections()) {
  96         QTcpSocket *socket = server->nextPendingConnection();
  97         connect(socket, SIGNAL(readyRead()), this, SLOT(respond()));
  98     }
  99 }
 100
 101
 102 void IdentServer::respond()
 103 {
 104     QTcpSocket *socket = qobject_cast<QTcpSocket *>(sender());
 105     Q_ASSERT(socket);
 106
 107     qint64 transactionId = _socketId;
 108
 109     if (!socket->canReadLine()) {
 110         return;
 111     }
 112
 113     QByteArray query = socket->readLine();
 114     if (query.endsWith("\r\n"))
 115         query.chop(2);
 116     else if (query.endsWith("\n"))
 117         query.chop(1);
 118
 119     QList<QByteArray> split = query.split(',');
 120
 121     bool success = false;
 122
 123     quint16 localPort = 0;
 124     if (!split.empty()) {
 125         localPort = split[0].trimmed().toUShort(&success, 10);
 126     }
 127
 128     Request request{socket, localPort, query, transactionId, _requestId++};
 129     if (!success) {
 130         request.respondError("INVALID-PORT");
 131     }
 132     else if (responseAvailable(request)) {
 133         // success
 134     }
 135     else if (lowestSocketId() < transactionId) {
 136         _requestQueue.emplace_back(request);
 137     }
 138     else {
 139         request.respondError("NO-USER");
 140     }
 141 }
 142
 143
 144 void Request::respondSuccess(const QString &user)
 145 {
 146     QString data = query + " : USERID : Quassel : " + user + "\r\n";
 147
 148     socket->write(data.toUtf8());
 149     socket->flush();
 150     socket->close();
 151 }
 152
 153
 154 void Request::respondError(const QString &error)
 155 {
 156     QString data = query + " : ERROR : " + error + "\r\n";
 157
 158     socket->write(data.toUtf8());
 159     socket->flush();
 160     socket->close();
 161 }
 162
 163
 164 bool IdentServer::responseAvailable(Request request) const
 165 {
 166     if (!_connections.contains(request.localPort)) {
 167         return false;
 168     }
 169
 170     request.respondSuccess(_connections[request.localPort]);
 171     return true;
 172 }
 173
 174
 175 void IdentServer::addSocket(const CoreIdentity *identity, const QHostAddress &localAddress, quint16 localPort,
 176                             const QHostAddress &peerAddress, quint16 peerPort, qint64 socketId)
 177 {
 178     Q_UNUSED(localAddress)
 179     Q_UNUSED(peerAddress)
 180     Q_UNUSED(peerPort)
 181
 182     const CoreNetwork *network = qobject_cast<CoreNetwork *>(sender());
 183     _connections[localPort] = network->coreSession()->strictCompliantIdent(identity);;
 184     processWaiting(socketId);
 185 }
 186
 187
 188 void IdentServer::removeSocket(const CoreIdentity *identity, const QHostAddress &localAddress, quint16 localPort,
 189                                const QHostAddress &peerAddress, quint16 peerPort, qint64 socketId)
 190 {
 191     Q_UNUSED(identity)
 192     Q_UNUSED(localAddress)
 193     Q_UNUSED(peerAddress)
 194     Q_UNUSED(peerPort)
 195
 196     _connections.remove(localPort);
 197     processWaiting(socketId);
 198 }
 199
 200
 201 qint64 IdentServer::addWaitingSocket()
 202 {
 203     qint64 newSocketId = _socketId++;
 204     _waiting.push_back(newSocketId);
 205     return newSocketId;
 206 }
 207
 208
 209 qint64 IdentServer::lowestSocketId() const
 210 {
 211     if (_waiting.empty()) {
 212         return std::numeric_limits<qint64>::max();
 213     }
 214
 215     return _waiting.front();
 216 }
 217
 218
 219 void IdentServer::removeWaitingSocket(qint64 socketId)
 220 {
 221     _waiting.remove(socketId);
 222 }
 223
 224
 225 void IdentServer::processWaiting(qint64 socketId)
 226 {
 227     removeWaitingSocket(socketId);
 228
 229     _requestQueue.remove_if([this, socketId](Request request) {
 230         if (socketId < request.transactionId && responseAvailable(request)) {
 231             return true;
 232         }
 233         else if (lowestSocketId() < request.transactionId) {
 234             return false;
 235         }
 236         else {
 237             request.respondError("NO-USER");
 238             return true;
 239         }
 240     });
 241 }
 242
 243
 244 bool operator==(const Request &a, const Request &b)
 245 {
 246     return a.requestId == b.requestId;
 247 }