mirror of https://github.com/qTox/qTox.git
Diadlo
9 years ago
5 changed files with 16 additions and 345 deletions
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/*
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Copyright © 2014-2015 by The qTox Project |
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This file is part of qTox, a Qt-based graphical interface for Tox. |
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qTox 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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qTox 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. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with qTox. If not, see <http://www.gnu.org/licenses/>.
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*/ |
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#include "src/net/toxdns.h" |
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#include "src/core/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_HEX_ID_LENGTH 2*TOX_ADDRESS_SIZE |
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/**
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* @class ToxDNS |
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* @brief Handles tox1 and tox3 DNS queries. |
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*/ |
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/**
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* @struct tox3_server |
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* @brief Represents a tox3 server. |
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* |
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* @var const char* tox3_server::name |
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* @brief Hostname of the server, e.g. toxme.se. |
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* |
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* @var uint8_t* tox3_server::pubkey |
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* @brief Public key of the tox3 server, usually 256bit long. |
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*/ |
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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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{"sr.ht", (uint8_t[32]){0x05, 0x08, 0x88, 0xFE, 0x0C, 0x88, 0x29, 0xAA, 0x43, 0xE0, 0xC9, 0xFD, 0x49, 0x6D, 0x6C, 0x4A, |
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0xFE, 0xEF, 0xEB, 0x6D, 0x55, 0x71, 0xF4, 0x2F, 0x30, 0xEB, 0x5F, 0x3B, 0x4C, 0xD9, 0x4F, 0xE5}}, |
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{"toxme.io", (uint8_t[32]){ 0x1A, 0x39, 0xE7, 0xA5, 0xD5, 0xFA, 0x9C, 0xF1, 0x55, 0xC7, 0x51, 0x57, 0x0A, 0x32, 0xE6, 0x25, |
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0x69, 0x8A, 0x60, 0xA5, 0x5F, 0x6D, 0x88, 0x02, 0x8F, 0x94, 0x9F, 0x66, 0x14, 0x4F, 0x4F, 0x25 }} |
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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 DNS"); |
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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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/**
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* @brief Try to fetch the first entry of the given TXT record. |
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* @param record Record to search. |
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* @param silent May display message boxes on error if silent is false. |
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* @return An empty object on failure. May block for up to ~3s. |
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*/ |
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QByteArray ToxDNS::fetchLastTextRecord(const QString& record, bool silent) |
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{ |
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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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{ |
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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 QByteArray(); |
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} |
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if (dns.error() == QDnsLookup::NotFoundError) |
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{ |
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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 QByteArray(); |
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} |
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else if (dns.error() != QDnsLookup::NoError) |
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{ |
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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 QByteArray(); |
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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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{ |
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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 QByteArray(); |
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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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{ |
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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 QByteArray(); |
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} |
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return textRecordValues.first(); |
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} |
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/**
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* @brief Send query to DNS to find Tox Id. |
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* @note Will *NOT* fallback on queryTox1 anymore. |
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* @param server Server to sending query. |
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* @param record Should look like user@domain.tld. |
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* @param silent If true, there will be no output on error. |
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* @return Tox Id string. |
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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() << "failed to create a tox_dns3 object for "<<server.name<<", using toxdns1 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 toxdns1 if toxdns3 fails
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{ |
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qWarning() << "failed to generate dns3 string for "<<server.name<<", using toxdns1 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() << "Server "<<server.name<<" returned no record, assuming the Tox ID doesn't exist"; |
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return toxIdStr; |
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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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{ |
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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() << "Server "<<server.name<<" returned a bad version ("<<ver<<"), using toxdns1 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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{ |
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qWarning() << "Server "<<server.name<<" returned an empty id, using toxdns1 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_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 toxdns1 if toxdns3 fails
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{ |
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qWarning() << "Failed to decrypt dns3 reply for "<<server.name<<", using toxdns1 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 toxdns1 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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return toxIdStr; |
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} |
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/**
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* @brief Tries to map a text string to a ToxId struct, will query Tox DNS records if necessary. |
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* @param address Adress to search for Tox ID. |
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* @param silent If true, there will be no output on error. |
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* @return Found Tox Id. |
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*/ |
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ToxId ToxDNS::resolveToxAddress(const QString &address, bool silent) |
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{ |
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if (address.isEmpty()) |
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return ToxId(); |
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if (ToxId::isToxId(address)) |
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return ToxId(address); |
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// If we're querying one of our pinned servers, do a toxdns3 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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return ToxId(queryTox3(pin, address, silent)); |
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} |
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// Otherwise try toxdns3 if we can get a pubkey or fallback to toxdns1
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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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pubkey = QByteArray::fromHex(pubkey); |
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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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return ToxId(queryTox3(server, address, silent)); |
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} |
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return ToxId(); |
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} |
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@ -1,58 +0,0 @@ |
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/*
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Copyright © 2014-2015 by The qTox Project |
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This file is part of qTox, a Qt-based graphical interface for Tox. |
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qTox 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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|
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qTox 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. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with qTox. If not, see <http://www.gnu.org/licenses/>.
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*/ |
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#ifndef QTOXDNS_H |
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#define QTOXDNS_H |
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#include "src/core/corestructs.h" |
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#include "src/core/toxid.h" |
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#include <QDnsLookup> |
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#include <QObject> |
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class ToxDNS : public QObject |
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{ |
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Q_OBJECT |
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public: |
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struct tox3_server |
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{ |
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tox3_server()=default; |
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tox3_server(const char* _name, uint8_t _pk[32]):name{_name},pubkey{_pk}{} |
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const char* name; |
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uint8_t* pubkey; |
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}; |
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public: |
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static ToxId resolveToxAddress(const QString& address, bool silent=true); |
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static QString queryTox3(const tox3_server& server, const QString& record, bool silent=true); |
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protected: |
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static void showWarning(const QString& message); |
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ToxDNS()=default; |
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private: |
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static QByteArray fetchLastTextRecord(const QString& record, bool silent=true); |
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public: |
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static const tox3_server pinnedServers[4]; |
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}; |
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#endif // QTOXDNS_H
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