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307 lines
8.8 KiB
307 lines
8.8 KiB
/**
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* Digital Voice Modem - Remote Command Client
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* GPLv2 Open Source. Use is subject to license terms.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* @package DVM / Remote Command Client
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*
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*/
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//
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// Based on code from the MMDVMHost project. (https://github.com/g4klx/MMDVMHost)
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// Licensed under the GPLv2 License (https://opensource.org/licenses/GPL-2.0)
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//
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/*
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* Copyright (C) 2019 by Jonathan Naylor G4KLX
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* Copyright (C) 2019 by Bryan Biedenkapp <gatekeep@gmail.com>
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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 "Defines.h"
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#include "edac/SHA256.h"
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#include "network/UDPSocket.h"
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#include "RemoteCommand.h"
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#include "Log.h"
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using namespace network;
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#include <cstdio>
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#include <cassert>
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#include <cstdlib>
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#include <cstring>
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// ---------------------------------------------------------------------------
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// Constants
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// ---------------------------------------------------------------------------
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#undef __PROG_NAME__
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#define __PROG_NAME__ "Digital Voice Modem (DVM) RCON Tool"
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#undef __EXE_NAME__
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#define __EXE_NAME__ "dvmcmd"
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const uint32_t START_OF_TEXT = 0x02;
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const uint32_t REC_SEPARATOR = 0x1E;
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const uint32_t RC_BUFFER_LENGTH = 140U;
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// ---------------------------------------------------------------------------
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// Macros
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// ---------------------------------------------------------------------------
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#define IS(s) (::strcmp(argv[i], s) == 0)
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// ---------------------------------------------------------------------------
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// Global Variables
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// ---------------------------------------------------------------------------
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static std::string g_progExe = std::string(__EXE_NAME__);
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static std::string g_remoteAddress = std::string("127.0.0.1");
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static uint32_t g_remotePort = RCON_DEFAULT_PORT;
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static std::string g_remotePassword = std::string();
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// ---------------------------------------------------------------------------
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// Global Functions
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// ---------------------------------------------------------------------------
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void fatal(const char* message)
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{
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::fprintf(stderr, "%s: %s\n", g_progExe.c_str(), message);
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exit(EXIT_FAILURE);
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}
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void usage(const char* message, const char* arg)
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{
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::fprintf(stdout, __PROG_NAME__ " %s (built %s)\r\n", __VER__, __BUILD__);
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if (message != NULL) {
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::fprintf(stderr, "%s: ", g_progExe.c_str());
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::fprintf(stderr, message, arg);
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::fprintf(stderr, "\n\n");
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}
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::fprintf(stdout, "usage: %s [-v] [-a <address>] [-p <port>] [-P <password>] <command>\n\n"
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" -a remote modem command address\n"
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" -p remote modem command port\n"
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" -P remote modem authentication password\n"
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"\n"
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" -v show version information\n"
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" -h show this screen\n"
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" -- stop handling options\n",
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g_progExe.c_str());
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exit(EXIT_FAILURE);
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}
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int checkArgs(int argc, char* argv[])
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{
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int i, p = 0;
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// iterate through arguments
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for (i = 1; i <= argc; i++)
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{
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if (argv[i] == NULL) {
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break;
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}
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if (*argv[i] != '-') {
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continue;
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}
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else if (IS("--")) {
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++p;
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break;
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}
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else if (IS("-a")) {
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if ((argc - 1) <= 0)
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usage("error: %s", "must specify the address to connect to");
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g_remoteAddress = std::string(argv[++i]);
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if (g_remoteAddress == "")
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usage("error: %s", "remote address cannot be blank!");
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p += 2;
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}
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else if (IS("-p")) {
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if ((argc - 1) <= 0)
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usage("error: %s", "must specify the port to connect to");
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g_remotePort = (uint32_t)::atoi(argv[++i]);
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if (g_remotePort == 0)
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usage("error: %s", "remote port number cannot be blank or 0!");
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p += 2;
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}
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else if (IS("-P")) {
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if ((argc - 1) <= 0)
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usage("error: %s", "must specify the auth password");
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g_remotePassword = std::string(argv[++i]);
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if (g_remotePassword == "")
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usage("error: %s", "remote auth password cannot be blank!");
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p += 2;
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}
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else if (IS("-v")) {
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::fprintf(stdout, __PROG_NAME__ " %s (built %s)\r\n", __VER__, __BUILD__);
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if (argc == 2)
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exit(EXIT_SUCCESS);
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}
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else if (IS("-h")) {
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usage(NULL, NULL);
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if (argc == 2)
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exit(EXIT_SUCCESS);
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}
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else {
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usage("unrecognized option `%s'", argv[i]);
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}
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}
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if (p < 0 || p > argc) {
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p = 0;
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}
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return ++p;
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}
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// ---------------------------------------------------------------------------
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// Program Entry Point
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// ---------------------------------------------------------------------------
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int main(int argc, char** argv)
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{
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if (argv[0] != NULL && *argv[0] != 0)
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g_progExe = std::string(argv[0]);
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if (argc < 2) {
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usage("error: %s", "must specify the remote command!");
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return EXIT_FAILURE;
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}
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if (argc > 1) {
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// check arguments
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int i = checkArgs(argc, argv);
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if (i < argc) {
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argc -= i;
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argv += i;
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}
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else {
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argc--;
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argv++;
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}
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}
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// process command
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std::string cmd = std::string(argv[0]);
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for (int i = 1; i < argc; i++) {
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cmd += " ";
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cmd += std::string(argv[i]);
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}
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// initialize system logging
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bool ret = ::LogInitialise("", "", 0U, 1U);
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if (!ret) {
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::fprintf(stderr, "unable to open the log file\n");
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return 1;
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}
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CRemoteCommand* command = new CRemoteCommand(g_remoteAddress, g_remotePort, g_remotePassword);
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int retCode = command->send(cmd);
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::LogFinalise();
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return retCode;
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}
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// ---------------------------------------------------------------------------
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// Public Class Members
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// ---------------------------------------------------------------------------
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/// <summary>
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/// Initializes a new instance of the CRemoteCommand class.
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/// </summary>
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/// <param name="address">Network Hostname/IP address to connect to.</param>
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/// <param name="port">Network port number.</param>
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/// <param name="password">Authentication password.</param>
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CRemoteCommand::CRemoteCommand(const std::string& address, uint32_t port, const std::string& password) :
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m_address(address),
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m_port(port),
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m_password(password)
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{
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assert(!address.empty());
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assert(port > 0U);
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}
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/// <summary>
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/// Finalizes a instance of the CRemoteCommand class.
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/// </summary>
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CRemoteCommand::~CRemoteCommand()
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{
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/* stub */
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}
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/// <summary>
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/// Sends remote control command to the specified modem.
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/// </summary>
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/// <param name="command">Command string to send to remote modem.</param>
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/// <returns>EXIT_SUCCESS, if command was sent, otherwise EXIT_FAILURE.</returns>
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int CRemoteCommand::send(const std::string& command)
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{
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UDPSocket socket(0U);
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bool ret = socket.open();
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if (!ret)
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return EXIT_FAILURE;
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uint8_t buffer[RC_BUFFER_LENGTH];
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::memset(buffer, 0x00U, RC_BUFFER_LENGTH);
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sockaddr_storage addr;
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uint32_t addrLen;
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if (UDPSocket::lookup(m_address, m_port, addr, addrLen) != 0)
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addrLen = 0U;
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if (addrLen > 0U) {
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return EXIT_FAILURE;
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}
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::LogInfoEx(LOG_HOST, "%s: sending command \"%s\" to %s:%u\r\n", g_progExe.c_str(), command.c_str(),
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m_address.c_str(), m_port);
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buffer[0U] = START_OF_TEXT;
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if (!m_password.empty()) {
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size_t size = m_password.size();
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uint8_t* in = new uint8_t[size];
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for (size_t i = 0U; i < size; i++)
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in[i] = m_password.at(i);
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uint8_t out[32U];
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::memset(out, 0x00U, 32U);
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edac::SHA256 sha256;
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sha256.buffer(in, (uint32_t)(size), out);
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::memcpy(buffer + 1U, out, 32U);
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}
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buffer[33U] = REC_SEPARATOR;
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::memcpy(buffer + 34U, command.c_str(), command.size());
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ret = socket.write((uint8_t *)buffer, 34U + command.size(), addr, m_port);
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if (!ret) {
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socket.close();
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::LogError(LOG_HOST, "Failed to send command: \"%s\"\r\n", command.c_str());
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return EXIT_FAILURE;
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}
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socket.close();
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return EXIT_SUCCESS;
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}
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