Jonathan Naylor
4 years ago
parent
1d428e921d
commit
c159461f30
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/*
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* Copyright (C) 2021 by Jonathan Naylor G4KLX
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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 "BlockList.h"
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#include "YSFDefines.h"
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#include "Log.h"
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#include <algorithm>
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#include <cstdio>
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#include <cassert>
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const int BUFFER_SIZE = 500;
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CBlockList::CBlockList(const std::string& file, unsigned int time) :
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m_file(file),
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m_time(time),
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m_callsigns(),
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m_timer(1000U, time * 60U),
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m_checksum(0U)
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{
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}
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CBlockList::~CBlockList()
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{
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}
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bool CBlockList::start()
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{
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loadFile();
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m_timer.start();
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return true;
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}
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bool CBlockList::check(const unsigned char* callsign) const
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{
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assert(callsign != NULL);
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std::string call = std::string((char*)callsign, YSF_CALLSIGN_LENGTH);
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std::for_each(call.begin(), call.end(), [](char& c) {
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c = std::toupper(c);
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});
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for (std::vector<std::string>::const_iterator it = m_callsigns.cbegin(); it != m_callsigns.cend(); ++it) {
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const std::string blocked = *it;
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if (call.find(blocked) != std::string::npos)
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return false;
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}
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return true;
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}
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void CBlockList::clock(unsigned int ms)
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{
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m_timer.clock(ms);
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if (m_timer.isRunning() && m_timer.hasExpired()) {
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loadFile();
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m_timer.start();
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}
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}
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bool CBlockList::loadFile()
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{
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FILE* fp = ::fopen(m_file.c_str(), "rt");
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if (fp == NULL)
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return false;
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char buffer[BUFFER_SIZE];
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// First perform the checksum (Fletcher 16)
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uint16_t sum1 = 0U;
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uint16_t sum2 = 0U;
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while (::fgets(buffer, BUFFER_SIZE, fp) != NULL) {
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for (char* p = buffer; *p != '\0'; p++) {
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sum1 = (sum1 + uint8_t(*p)) % 255U;
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sum2 = (sum2 + sum1) % 255U;
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}
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}
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uint16_t checksum = (sum2 << 8) | sum1;
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if (checksum == m_checksum) {
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::fclose(fp);
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return false;
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}
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m_checksum = checksum;
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// Rewind the file
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::fseek(fp, 0L, SEEK_SET);
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// Read the callsigns into the array
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m_callsigns.clear();
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unsigned int n = 0U;
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while (::fgets(buffer, BUFFER_SIZE, fp) != NULL) {
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char* p;
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if ((p = ::strchr(buffer, '\n')) != NULL)
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*p = '\0';
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if ((p = ::strchr(buffer, '\r')) != NULL)
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*p = '\0';
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if (::strlen(buffer) > 0U) {
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std::string callsign = std::string(buffer);
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std::for_each(callsign.begin(), callsign.end(), [](char& c) {
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c = std::toupper(c);
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});
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m_callsigns.push_back(callsign);
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n++;
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}
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}
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::fclose(fp);
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LogInfo("Loaded %u callsigns from the block list", n);
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return true;
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}
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@ -0,0 +1,50 @@
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/*
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* Copyright (C) 2021 by Jonathan Naylor G4KLX
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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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#if !defined(BLOCKLIST_H)
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#define BLOCKLIST_H
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#include "Timer.h"
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#include <cstdint>
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#include <string>
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#include <vector>
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class CBlockList
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{
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public:
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CBlockList(const std::string& file, unsigned int time);
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~CBlockList();
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bool start();
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bool check(const unsigned char* callsign) const;
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void clock(unsigned int ms);
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private:
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std::string m_file;
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unsigned int m_time;
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std::vector<std::string> m_callsigns;
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CTimer m_timer;
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uint16_t m_checksum;
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bool loadFile();
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};
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#endif
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