mirror of
https://github.com/qTox/qTox.git
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268 lines
8.5 KiB
C++
268 lines
8.5 KiB
C++
/*
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Copyright (C) 2014 by Project Tox <https://tox.im>
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This file is part of qTox, a Qt-based graphical interface for Tox.
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This program is libre software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the COPYING file for more details.
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*/
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#include "src/toxdns.h"
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#include "src/misc/cdata.h"
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#include <QMessageBox>
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#include <QCoreApplication>
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#include <QThread>
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#include <QDebug>
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#include <tox/tox.h>
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#include <tox/toxdns.h>
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#define TOX_ID_LENGTH 2*TOX_FRIEND_ADDRESS_SIZE
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const ToxDNS::tox3_server ToxDNS::pinnedServers[]
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{
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{"toxme.se", (uint8_t[32]){0x5D, 0x72, 0xC5, 0x17, 0xDF, 0x6A, 0xEC, 0x54, 0xF1, 0xE9, 0x77, 0xA6, 0xB6, 0xF2, 0x59, 0x14,
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0xEA, 0x4C, 0xF7, 0x27, 0x7A, 0x85, 0x02, 0x7C, 0xD9, 0xF5, 0x19, 0x6D, 0xF1, 0x7E, 0x0B, 0x13}},
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{"utox.org", (uint8_t[32]){0xD3, 0x15, 0x4F, 0x65, 0xD2, 0x8A, 0x5B, 0x41, 0xA0, 0x5D, 0x4A, 0xC7, 0xE4, 0xB3, 0x9C, 0x6B,
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0x1C, 0x23, 0x3C, 0xC8, 0x57, 0xFB, 0x36, 0x5C, 0x56, 0xE8, 0x39, 0x27, 0x37, 0x46, 0x2A, 0x12}}
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};
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void ToxDNS::showWarning(const QString &message)
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{
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QMessageBox warning;
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warning.setWindowTitle("Tox");
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warning.setText(message);
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warning.setIcon(QMessageBox::Warning);
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warning.exec();
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}
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QByteArray ToxDNS::fetchLastTextRecord(const QString& record, bool silent)
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{
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QByteArray result;
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QDnsLookup dns;
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dns.setType(QDnsLookup::TXT);
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dns.setName(record);
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dns.lookup();
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int timeout;
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for (timeout = 0; timeout<30 && !dns.isFinished(); ++timeout)
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{
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qApp->processEvents();
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QThread::msleep(100);
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}
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if (timeout >= 30) {
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dns.abort();
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if (!silent)
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showWarning(tr("The connection timed out","The DNS gives the Tox ID associated to toxme.se addresses"));
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return result;
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}
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if (dns.error() == QDnsLookup::NotFoundError) {
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if (!silent)
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showWarning(tr("This address does not exist","The DNS gives the Tox ID associated to toxme.se addresses"));
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return result;
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}
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else if (dns.error() != QDnsLookup::NoError) {
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if (!silent)
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showWarning(tr("Error while looking up DNS","The DNS gives the Tox ID associated to toxme.se addresses"));
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return result;
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}
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const QList<QDnsTextRecord> textRecords = dns.textRecords();
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if (textRecords.isEmpty()) {
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if (!silent)
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showWarning(tr("No text record found", "Error with the DNS"));
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return result;
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}
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const QList<QByteArray> textRecordValues = textRecords.last().values();
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if (textRecordValues.length() != 1) {
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if (!silent)
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showWarning(tr("Unexpected number of values in text record", "Error with the DNS"));
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return result;
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}
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result = textRecordValues.first();
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return result;
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}
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QString ToxDNS::queryTox1(const QString& record, bool silent)
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{
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QString realRecord = record, toxId;
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realRecord.replace("@", "._tox.");
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const QString entry = fetchLastTextRecord(realRecord, silent);
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if (entry.isEmpty())
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return toxId;
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// Check toxdns protocol version
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int verx = entry.indexOf("v=");
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if (verx) {
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verx += 2;
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int verend = entry.indexOf(';', verx);
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if (verend)
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{
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QString ver = entry.mid(verx, verend-verx);
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if (ver != "tox1")
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{
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if (!silent)
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showWarning(tr("The version of Tox DNS used by this server is not supported", "Error with the DNS"));
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return toxId;
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}
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}
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}
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// Get the tox id
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int idx = entry.indexOf("id=");
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if (idx < 0) {
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if (!silent)
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showWarning(tr("The DNS lookup does not contain any Tox ID", "Error with the DNS"));
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return toxId;
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}
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idx += 3;
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if (entry.length() < idx + static_cast<int>(TOX_ID_LENGTH)) {
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if (!silent)
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showWarning(tr("The DNS lookup does not contain a valid Tox ID", "Error with the DNS"));
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return toxId;
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}
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toxId = entry.mid(idx, TOX_ID_LENGTH);
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if (!ToxID::isToxId(toxId)) {
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if (!silent)
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showWarning(tr("The DNS lookup does not contain a valid Tox ID", "Error with the DNS"));
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return toxId;
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}
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return toxId;
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}
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QString ToxDNS::queryTox3(const tox3_server& server, const QString &record, bool silent)
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{
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QByteArray nameData = record.left(record.indexOf('@')).toUtf8(), id, realRecord;
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QString entry, toxIdStr;
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int toxIdSize, idx, verx, dns_string_len;
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const int dns_string_maxlen = 128;
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void* tox_dns3 = tox_dns3_new(server.pubkey);
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if (!tox_dns3)
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{
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qWarning() << "queryTox3: failed to create a tox_dns3 object for "<<server.name<<", using tox1 as a fallback";
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goto fallbackOnTox1;
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}
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uint32_t request_id;
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uint8_t dns_string[dns_string_maxlen];
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dns_string_len = tox_generate_dns3_string(tox_dns3, dns_string, dns_string_maxlen, &request_id,
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(uint8_t*)nameData.data(), nameData.size());
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if (dns_string_len < 0) // We can always fallback on tox1 if toxdns3 fails
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{
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qWarning() << "queryTox3: failed to generate dns3 string for "<<server.name<<", using tox1 as a fallback";
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goto fallbackOnTox1;
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}
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realRecord = '_'+QByteArray((char*)dns_string, dns_string_len)+"._tox."+server.name;
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entry = fetchLastTextRecord(realRecord, silent);
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if (entry.isEmpty())
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{
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qWarning() << "queryTox3: Server "<<server.name<<" returned no record, using tox1 as a fallback";
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goto fallbackOnTox1;
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}
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// Check toxdns protocol version
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verx = entry.indexOf("v=");
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if (verx!=-1) {
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verx += 2;
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int verend = entry.indexOf(';', verx);
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if (verend!=-1)
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{
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QString ver = entry.mid(verx, verend-verx);
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if (ver != "tox3")
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{
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qWarning() << "queryTox3: Server "<<server.name<<" returned a bad version ("<<ver<<"), using tox1 as a fallback";
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goto fallbackOnTox1;
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}
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}
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}
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// Get and decrypt the tox id
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idx = entry.indexOf("id=");
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if (idx < 0) {
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qWarning() << "queryTox3: Server "<<server.name<<" returned an empty id, using tox1 as a fallback";
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goto fallbackOnTox1;
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}
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idx += 3;
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id = entry.mid(idx).toUtf8();
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uint8_t toxId[TOX_FRIEND_ADDRESS_SIZE];
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toxIdSize = tox_decrypt_dns3_TXT(tox_dns3, toxId, (uint8_t*)id.data(), id.size(), request_id);
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if (toxIdSize < 0) // We can always fallback on tox1 if toxdns3 fails
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{
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qWarning() << "queryTox3: failed to decrypt dns3 reply for "<<server.name<<", using tox1 as a fallback";
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goto fallbackOnTox1;
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}
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tox_dns3_kill(tox_dns3);
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toxIdStr = CFriendAddress::toString(toxId);
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return toxIdStr;
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// Centralized error handling, fallback on tox1 queries
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fallbackOnTox1:
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if (tox_dns3)
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tox_dns3_kill(tox_dns3);
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#if TOX1_SILENT_FALLBACK
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toxIdStr = queryTox1(record, silent);
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#endif
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return toxIdStr;
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}
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ToxID ToxDNS::resolveToxAddress(const QString &address, bool silent)
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{
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ToxID toxId;
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if (address.isEmpty()) {
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return toxId;
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} else if (ToxID::isToxId(address)) {
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toxId = ToxID::fromString(address);
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return toxId;
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} else {
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// If we're querying one of our pinned server, do a tox3 request directly
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QString servname = address.mid(address.indexOf('@')+1);
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for (const ToxDNS::tox3_server& pin : ToxDNS::pinnedServers)
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{
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if (servname == pin.name)
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{
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toxId = ToxID::fromString(queryTox3(pin, address, silent));
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return toxId;
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}
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}
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// Otherwise try tox3 if we can get a pubkey or fallback to tox1
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QByteArray pubkey = fetchLastTextRecord("_tox."+servname, true);
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if (!pubkey.isEmpty())
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{
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QByteArray servnameData = servname.toUtf8();
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ToxDNS::tox3_server server;
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server.name = servnameData.data();
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server.pubkey = (uint8_t*)pubkey.data();
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toxId = ToxID::fromString(queryTox3(server, address, silent));
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}
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else
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{
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#if TOX1_SILENT_FALLBACK
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toxId = ToxID::fromString(queryTox1(address, silent));
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#else
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return toxId;
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#endif
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}
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return toxId;
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}
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}
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