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142 lines
4.1 KiB
142 lines
4.1 KiB
/*
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* Copyright (C) 2010-2015 by Jonathan Naylor G4KLX
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* Copyright (C) 2018-2019 by Thomas A. Early N7TAE
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*
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* This program is free 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 2 of the License, or
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* (at your option) any later version.
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*
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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. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <string>
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#include <cassert>
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#include <cstdio>
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#include <cctype>
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#include <cstring>
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#include <thread>
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#include <chrono>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include "DPlusAuthenticator.h"
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CDPlusAuthenticator::CDPlusAuthenticator(const std::string &loginCallsign, const std::string &address) :
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m_loginCallsign(loginCallsign),
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m_address(address)
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{
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assert(loginCallsign.size());
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Trim(m_loginCallsign);
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}
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CDPlusAuthenticator::~CDPlusAuthenticator()
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{
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}
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bool CDPlusAuthenticator::Process(std::map<std::string, std::string> &gwy_map, const bool reflectors, const bool repeaters)
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// return true if everything went okay
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{
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int result = client.Open(m_address, AF_UNSPEC, "20001");
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if (result) {
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fprintf(stderr, "DPlus Authorization failed: %s\n", gai_strerror(result));
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return true;
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}
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return authenticate(gwy_map, reflectors, repeaters);
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}
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bool CDPlusAuthenticator::authenticate(std::map<std::string, std::string> &gwy_map, const bool reflectors, const bool repeaters)
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{
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unsigned char* buffer = new unsigned char[4096U];
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::memset(buffer, ' ', 56U);
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buffer[0U] = 0x38U;
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buffer[1U] = 0xC0U;
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buffer[2U] = 0x01U;
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buffer[3U] = 0x00U;
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::memcpy(buffer+4, m_loginCallsign.c_str(), m_loginCallsign.size());
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::memcpy(buffer+12, "DV019999", 8);
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::memcpy(buffer+28, "W7IB2", 5);
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::memcpy(buffer+40, "DHS0257", 7);
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if (client.Write(buffer, 56U)) {
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fprintf(stderr, "ERROR: could not write opening phrase\n");
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client.Close();
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delete[] buffer;
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return true;
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}
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int ret = client.ReadExact(buffer, 2U);
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size_t sofar = gwy_map.size();
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unsigned int returned = 0;
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while (ret == 2) {
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unsigned int len = (buffer[1U] & 0x0FU) * 256U + buffer[0U];
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// Ensure that we get exactly len - 2U bytes from the TCP stream
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ret = client.ReadExact(buffer + 2U, len - 2U);
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if (0 > ret) {
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fprintf(stderr, "Problem reading line, it returned %d\n", errno);
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return true;
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}
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if ((buffer[1U] & 0xC0U) != 0xC0U || buffer[2U] != 0x01U) {
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fprintf(stderr, "Invalid packet received from 20001\n");
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return true;
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}
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for (unsigned int i = 8U; (i + 25U) < len; i += 26U) {
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std::string address((char *)(buffer + i));
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std::string name((char *)(buffer + i + 16U));
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Trim(address);
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Trim(name);
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name.resize(8, ' ');
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// Get the active flag
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bool active = (buffer[i + 25U] & 0x80U) == 0x80U;
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// An empty name or IP address or an inactive gateway/reflector is not added
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if (address.size()>0U && name.size()>0U && active) {
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returned++;
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if (reflectors && 0==name.compare(0, 3, "REF"))
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gwy_map[name] = address.append(" 20001");
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else if (repeaters && name.compare(0, 3, "REF"))
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gwy_map[name] = address.append(" 20001");
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}
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}
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ret = client.ReadExact(buffer, 2U);
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}
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printf("Probably authorized DPlus on %s using callsign %s\n", m_address.c_str(), m_loginCallsign.c_str());
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printf("%s returned %u systems\n", m_address.c_str(), returned);
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printf("The gateway map increased by %u additional DPlus gateways\n", (unsigned int)(gwy_map.size() - sofar));
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client.Close();
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delete[] buffer;
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return false;
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}
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void CDPlusAuthenticator::Trim(std::string &s)
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{
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auto it = s.begin();
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while (it!=s.end() && isspace(*it))
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s.erase(it);
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auto rit = s.rbegin();
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while (rit!=s.rend() && isspace(*rit)) {
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s.resize(s.size() - 1);
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rit = s.rbegin();
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}
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}
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