tools/hexnet: Add command line parser back

Reimplementation has started.

scripts/build.sh

@@ -62,7 +62,7 @@ COMPILE_COMMANDS=(
     "$CXX_WITH_FLAGS src/tools/dumpnbt.cpp -I./include -Lbin/lib -l:nbt.so -l:javacompat.so -l:cli.so -o bin/tools/dumpnbt"
     "$CXX_WITH_FLAGS src/tools/arraydump.cpp -I./include -Lbin/lib -l:file.so -l:cli.so -o bin/tools/arraydump"
     "$CXX_WITH_FLAGS src/tools/baseconvert.cpp -I./include -Lbin/lib -l:cli.so -o bin/tools/baseconvert"
-    #"$CXX_WITH_FLAGS src/tools/hexnet.cpp -I./include -Lbin/lib -l:cli.so -l:libsockpp.so -o bin/tools/hexnet"
+    "$CXX_WITH_FLAGS src/tools/hexnet.cpp -I./include -Lbin/lib -l:cli.so -l:libsockpp.so -o bin/tools/hexnet"
 )
 for command in ${!COMPILE_COMMANDS[@]}; do
     echo "${COMPILE_COMMANDS[command]}"

src/lib/nbt.cpp

@@ -1176,6 +1176,7 @@ namespace NBT {
     // FIXME: memory leak when returning errors
     ErrorOr<std::vector<Tag::Generic*>> deserializeRawListContents(uint8_t data[], uint64_t dataSize, uint64_t initialPosition, uint64_t* processedDataSize) {
         std::vector<Tag::Generic*> contents;
+        ErrorOr<std::vector<Tag::Generic*>> returnValue;
         // get contained data length by reading it manually because
         // the function that does it normally can't deal with
         // headerless tags
@@ -1183,6 +1184,8 @@ namespace NBT {
         // add one byte to position to skip the type byte
         ErrorOr<int32_t> elementCount = Helper::readInt32(data, dataSize, initialPosition+1);
         if (elementCount.isError) {
+            // this is before the creation of any pointers so we can just return
+            // without using the returnError label at the end of this function
             return ErrorOr<std::vector<Tag::Generic*>>(true, elementCount.errorCode);
         }
 
@@ -1202,14 +1205,10 @@ namespace NBT {
                 for (int32_t i=0; i<elementCount.value; i++) {
                     ErrorOr<int8_t> nextInt = Helper::readInt8(data, dataSize, initialPosition+*processedDataSize);
                     if (nextInt.isError) {
-                        return ErrorOr<std::vector<Tag::Generic*>>(true, nextInt.errorCode);
+                        returnValue = ErrorOr<std::vector<Tag::Generic*>>(true, nextInt.errorCode);
+                        goto returnError;
                     }
                     contents.push_back(new Tag::Int8("", nextInt.value));
-                    // The below code would produce a warning on GCC and Clang
-                    // about the computed value not being used. While this does
-                    // apply inside this function, it is ultimately not true
-                    // as the pointer is used both inside and outside of the
-                    // function.
                     *processedDataSize += 1;
                 }
                 break;
@@ -1218,7 +1217,8 @@ namespace NBT {
                 for (int32_t i=0; i<elementCount.value; i++) {
                     ErrorOr<int16_t> nextInt = Helper::readInt16(data, dataSize, initialPosition+*processedDataSize);
                     if (nextInt.isError) {
-                        return ErrorOr<std::vector<Tag::Generic*>>(true, nextInt.errorCode);
+                        returnValue = ErrorOr<std::vector<Tag::Generic*>>(true, nextInt.errorCode);
+                        goto returnError;
                     }
                     contents.push_back(new Tag::Int16("", nextInt.value));
                     *processedDataSize += 2;
@@ -1229,7 +1229,8 @@ namespace NBT {
                 for (int32_t i=0; i<elementCount.value; i++) {
                     ErrorOr<int32_t> nextInt = Helper::readInt32(data, dataSize, initialPosition+*processedDataSize);
                     if (nextInt.isError) {
-                        return ErrorOr<std::vector<Tag::Generic*>>(true, nextInt.errorCode);
+                        returnValue = ErrorOr<std::vector<Tag::Generic*>>(true, nextInt.errorCode);
+                        goto returnError;
                     }
                     contents.push_back(new Tag::Int32("", nextInt.value));
                     *processedDataSize += 4;
@@ -1240,7 +1241,8 @@ namespace NBT {
                 for (int32_t i=0; i<elementCount.value; i++) {
                     ErrorOr<float> nextFloat = Helper::readFloat(data, dataSize, initialPosition+*processedDataSize);
                     if (nextFloat.isError) {
-                        return ErrorOr<std::vector<Tag::Generic*>>(true, nextFloat.errorCode);
+                        returnValue = ErrorOr<std::vector<Tag::Generic*>>(true, nextFloat.errorCode);
+                        goto returnError;
                     }
                     contents.push_back(new Tag::Float("", nextFloat.value));
                     *processedDataSize += 4;
@@ -1251,7 +1253,8 @@ namespace NBT {
                 for (int32_t i=0; i<elementCount.value; i++) {
                     ErrorOr<int64_t> nextInt = Helper::readInt64(data, dataSize, initialPosition+*processedDataSize);
                     if (nextInt.isError) {
-                        return ErrorOr<std::vector<Tag::Generic*>>(true, nextInt.errorCode);
+                        returnValue = ErrorOr<std::vector<Tag::Generic*>>(true, nextInt.errorCode);
+                        goto returnError;
                     }
                     contents.push_back(new Tag::Int64("", nextInt.value));
                     *processedDataSize += 8;
@@ -1262,7 +1265,8 @@ namespace NBT {
                 for (int32_t i=0; i<elementCount.value; i++) {
                     ErrorOr<double> nextDouble = Helper::readDouble(data, dataSize, initialPosition+*processedDataSize);
                     if (nextDouble.isError) {
-                        return ErrorOr<std::vector<Tag::Generic*>>(true, nextDouble.errorCode);
+                        returnValue = ErrorOr<std::vector<Tag::Generic*>>(true, nextDouble.errorCode);
+                        goto returnError;
                     }
                     contents.push_back(new Tag::Double("", nextDouble.value));
                     *processedDataSize += 8;
@@ -1273,7 +1277,8 @@ namespace NBT {
                 for (int32_t i=0; i<elementCount.value; i++) {
                     ErrorOr<std::vector<int8_t>> nextArray = Helper::readInt8Array(data, dataSize, initialPosition+*processedDataSize);
                     if (nextArray.isError) {
-                        return ErrorOr<std::vector<Tag::Generic*>>(true, nextArray.errorCode);
+                        returnValue = ErrorOr<std::vector<Tag::Generic*>>(true, nextArray.errorCode);
+                        goto returnError;
                     }
                     contents.push_back(new Tag::Int8Array("", nextArray.value));
                     *processedDataSize += (uint64_t) nextArray.value.size();
@@ -1284,7 +1289,8 @@ namespace NBT {
                 for (int32_t i=0; i<elementCount.value; i++) {
                     ErrorOr<tiny_utf8::string> nextString = Helper::readString(data, dataSize, initialPosition+*processedDataSize);
                     if (nextString.isError) {
-                        return ErrorOr<std::vector<Tag::Generic*>>(true, nextString.errorCode);
+                        returnValue = ErrorOr<std::vector<Tag::Generic*>>(true, nextString.errorCode);
+                        goto returnError;
                     }
                     contents.push_back(new Tag::String("", nextString.value));
                     // this cannot be an error because it just got read
@@ -1301,7 +1307,8 @@ namespace NBT {
                     ErrorOr<std::vector<Tag::Generic*>> nextListContents = deserializeRawListContents(data, dataSize, initialPosition+*processedDataSize, containedDataSize);
                     if (nextListContents.isError) {
                         delete containedDataSize;
-                        return ErrorOr<std::vector<Tag::Generic*>>(true, nextListContents.errorCode);
+                        returnValue = ErrorOr<std::vector<Tag::Generic*>>(true, nextListContents.errorCode);
+                        goto returnError;
                     }
                     contents.push_back(new Tag::List("", nextListContents.value));
                     *processedDataSize += *containedDataSize;
@@ -1316,7 +1323,8 @@ namespace NBT {
                     ErrorOr<std::vector<Tag::Generic*>> nextCompoundData = deserialize(data, dataSize, initialPosition+*processedDataSize, containedDataSize);
                     if (nextCompoundData.isError) {
                         delete containedDataSize;
-                        return ErrorOr<std::vector<Tag::Generic*>>(true, nextCompoundData.errorCode);
+                        returnValue = ErrorOr<std::vector<Tag::Generic*>>(true, nextCompoundData.errorCode);
+                        goto returnError;
                     }
                     contents.push_back(new Tag::Compound("", nextCompoundData.value));
                     *processedDataSize += *containedDataSize;
@@ -1328,7 +1336,8 @@ namespace NBT {
                 for (int32_t i=0; i<elementCount.value; i++) {
                     ErrorOr<std::vector<int32_t>> nextArray = Helper::readInt32Array(data, dataSize, initialPosition+*processedDataSize);
                     if (nextArray.isError) {
-                        return ErrorOr<std::vector<Tag::Generic*>>(true, nextArray.errorCode);
+                        returnValue = ErrorOr<std::vector<Tag::Generic*>>(true, nextArray.errorCode);
+                        goto returnError;
                     }
                     contents.push_back(new Tag::Int32Array("", nextArray.value));
                     *processedDataSize += (uint64_t) nextArray.value.size() * 4;
@@ -1339,7 +1348,8 @@ namespace NBT {
                 for (int32_t i=0; i<elementCount.value; i++) {
                     ErrorOr<std::vector<int64_t>> nextArray = Helper::readInt64Array(data, dataSize, initialPosition+*processedDataSize);
                     if (nextArray.isError) {
-                        return ErrorOr<std::vector<Tag::Generic*>>(true, nextArray.errorCode);
+                        returnValue = ErrorOr<std::vector<Tag::Generic*>>(true, nextArray.errorCode);
+                        goto returnError;
                     }
                     contents.push_back(new Tag::Int64Array("", nextArray.value));
                     *processedDataSize += (uint64_t) nextArray.value.size() * 8;
@@ -1347,9 +1357,16 @@ namespace NBT {
                 break;
             }
             default:
-                return ErrorOr<std::vector<Tag::Generic*>>(true, ErrorCodes::INVALID_TYPE);
+                returnValue = ErrorOr<std::vector<Tag::Generic*>>(true, ErrorCodes::INVALID_TYPE);
+                goto returnError;
         }
         return ErrorOr<std::vector<Tag::Generic*>>(contents);
+
+        returnError:
+            for (uint64_t i=0; i<contents.size(); i++) {
+                delete contents.at(i);
+            }
+            return returnValue;
     }
 
     // comment about blindly passing up error codes applies here

src/tools/hexnet.cpp

@@ -1,5 +1,8 @@
 //Copyright 2022, FOSS-VG Developers and Contributers
 //
+// Author(s):
+//   BodgeMaster, Shwoomple
+//
 //This program is free software: you can redistribute it and/or modify it
 //under the terms of the GNU Affero General Public License as published
 //by the Free Software Foundation, version 3.
@@ -13,206 +16,61 @@
 //version 3 along with this program.
 //If not, see https://www.gnu.org/licenses/agpl-3.0.en.html
 
-#include <iostream>
-#include <iomanip>
-#include <string>
-#include <cstdint>
-#include <cctype>
-#include <sockpp/tcp_acceptor.h>
-#include <sockpp/tcp6_acceptor.h>
-#include <sockpp/udp_socket.h>
-#include <sockpp/udp6_socket.h>
-#include <thread>
-#include <mutex>
 #include <csignal>
+#include <iostream>
+#include <mutex>
+#include <thread>
+#include <vector>
 
-#include "../lib/error.hpp"
 #include "../lib/cli.hpp"
+#include "../lib/error.hpp"
 
 #define EXIT_SUCCESS 0
 #define EXIT_RUNTIME 1
 #define EXIT_USAGE 2
 #define EXIT_UNIMPLEMENTED 3
 
-bool ipv4 = true;
-bool ipv6 = true;
-bool tcp = true;
-bool udp = true;
-bool listenMode = false;
-int64_t mtu = 1500;
-std::string host;
-in_port_t port;
-sockpp::tcp_socket* tcpSocket;
-sockpp::tcp6_socket* tcp6Socket;
-sockpp::udp_socket* udpSocket;
-sockpp::tcp_acceptor tcpAcceptor;
-sockpp::tcp6_acceptor tcp6Acceptor;
-std::mutex tcpSocketMutex;
-std::mutex tcp6SocketMutex;
-std::mutex udpSocketMutex;
-std::mutex udp6SocketMutex;
-std::mutex consoleMutex;
-// used for coordinated graceful exit across threads
-bool exitProgram = false;
+std::mutex mutexStdin;
+std::mutex mutexStdout;
+std::mutex mutexNetIncoming;
+std::mutex mutexNetOutgoing;
+
+bool ipv4 = false;
+bool ipv6 = false;
+bool tcp = false;
+bool udp = false;
 
 void signalHandler(int signal) {
-    exitProgram = true;
-    // if still waiting for incoming connection, stop waiting
-    tcpAcceptor.shutdown();
-    tcp6Acceptor.shutdown();
-    // tell sockpp to close TCP socket if open because it blocks when trying
-    // to read and there is no data
-
-    if (tcpSocket != nullptr && *tcpSocket) {
-        // Intentionally not using the mutex here
-        std::cout << "test\n";
-        tcpSocket->shutdown(SHUT_RD);
-    }
-
-    if (tcp6Socket != nullptr && *tcp6Socket) {
-        // Intentionally not using the mutex here
-        tcp6Socket->shutdown(SHUT_RD);
-    }
-    //TODO: figure out if - and how - this applies to UDP
-
-    // Priority is to finish up all unfinished business that can be finished up.
-    // If something has the console mutex locked, that should not prevent
-    // other threads from winding down. This is why logging happens last.
-    consoleMutex.lock();
+    // shut down gracefully
     std::cerr << "Received signal " << signal << ", shutting down." << std::endl;
-    consoleMutex.unlock();
     std::exit(signal);
 }
 
-void readFromConsole(){
-    while(!exitProgram){
-        char * test = new char[420];
-        consoleMutex.lock();
-        std::cout << "> ";
-        std::cin.read(test, 1);
-        consoleMutex.unlock();
-    }
-}
-
-void readFromTCPSocket(sockpp::tcp_socket* socket, int64_t mtu) {
-    ssize_t numBytes;
-    uint8_t buffer[mtu];
-    tcpSocketMutex.lock();
-    while (!exitProgram && (numBytes = socket->read(buffer, sizeof(buffer))) > 0) {
-        tcpSocketMutex.unlock();
-        consoleMutex.lock();
-        std::cout << "\n";
-        for (ssize_t i=0; i<numBytes; i++) {
-            std::cout << std::hex << std::setfill('0') << std::setw(2) << (short) buffer[i];
-        }
-        std::cout << "\n";
-        std::cout.flush();
-        consoleMutex.unlock();
-        tcpSocketMutex.lock();
-    }
-    tcpSocketMutex.unlock();
-    consoleMutex.lock();
-    std::cerr << std::endl << "Connection closed." << std::endl;
-    consoleMutex.unlock();
-}
-
-void readFromTCP6Socket(sockpp::tcp6_socket* socket, int64_t mtu){
-    ssize_t numBytes;
-    uint8_t buffer[mtu];
-    tcp6SocketMutex.lock();
-    while (!exitProgram && (numBytes = socket->read(buffer, sizeof(buffer))) > 0) {
-        tcp6SocketMutex.unlock();
-        consoleMutex.lock();
-        for (ssize_t i=0; i<numBytes; i++) {
-            std::cout << std::hex << std::setfill('0') << std::setw(2) << (short) buffer[i];
-        }
-        std::cout.flush();
-        consoleMutex.unlock();
-        tcp6SocketMutex.lock();
-    }
-    tcp6SocketMutex.unlock();
-    consoleMutex.lock();
-    std::cerr << std::endl << "Connection closed." << std::endl;
-    consoleMutex.unlock();
-}
-
-void readFromUDPSocket(sockpp::udp_socket* socket, int64_t mtu){
-    ssize_t numBytes;
-    uint8_t buffer[mtu];
-    typename sockpp::udp_socket::addr_t srcAddr;
-    udpSocketMutex.lock();
-    while(!exitProgram && (numBytes = socket->recv_from(buffer, sizeof(buffer), &srcAddr) > 0)){
-        udpSocketMutex.unlock();
-        consoleMutex.lock();
-        for(ssize_t i=0; i<numBytes; i++){
-            std::cout << std::hex << std::setfill('0') << std::setw(2) << (short) buffer[i];
-        }
-        std::cout.flush();
-        consoleMutex.unlock();
-        udpSocketMutex.lock();
-    }
-    udpSocketMutex.unlock();
-    consoleMutex.lock();
-    std::cerr << std::endl << "Connection closed." << std::endl;
-    consoleMutex.unlock();
-}
-
-void writeToTCPSocket(sockpp::tcp_socket* socket){
-    while (!exitProgram) {
-       //TODO: Implement locking/unlocking/threading shenanigans
-    }
-    consoleMutex.lock();
-    std::cerr << std::endl << "Connection closed." << std::endl;
-    consoleMutex.unlock();
-}
-
-void writeToTCP6Socket(sockpp::tcp6_socket* socket){
-    while (!exitProgram) {
-       //TODO: Implement locking/unlocking/threading shenanigans
-    }
-    consoleMutex.lock();
-    std::cerr << std::endl << "Connection closed." << std::endl;
-    consoleMutex.unlock();
-}
-
-int main(int argc, char* argv[]){
-    sockpp::socket_initializer socketInitializer;
-
+int main(int argc, char* argv[]) {
     std::signal(SIGINT, signalHandler);
     std::signal(SIGTERM, signalHandler);
 
     std::vector<CLI::Flag> flags;
-    flags.push_back(CLI::Flag('4', "ipv4", "use IPv4, defaults to both when -4 and -6 are omitted, otherwise uses what is specified"));
-    flags.push_back(CLI::Flag('6', "ipv6", "use IPv6, defaults to both when -4 and -6 are omitted, otherwise uses what is specified"));
-    flags.push_back(CLI::Flag('t', "tcp", "use TCP, defaults to both when -t and -u are omitted, otherwise uses what is specified"));
-    flags.push_back(CLI::Flag('u', "udp", "use UDP, defaults to both when -t and -u are omitted, otherwise uses what is specified"));
-    flags.push_back(CLI::Flag('n', "no-color", "disable coloring the output (intended for terminals that don't work well with color escape sequences)"));
-    flags.push_back(CLI::Flag('e', "echo-back", "echo input back to stdout"));
+    flags.push_back(CLI::Flag('4', "ipv4", "use IPv4, either this or IPv6 has to be specified"));
+    flags.push_back(CLI::Flag('6', "ipv6", "use IPv6, either this or IPv4 has to be specified"));
+    flags.push_back(CLI::Flag('t', "tcp", "use TCP, either this or UDP has to be specified"));
+    flags.push_back(CLI::Flag('u', "udp", "use UDP, either this or TCP has to be specified"));
     flags.push_back(CLI::Flag('h', "help", "print this information and exit"));
     flags.push_back(CLI::Flag('l', "license", "print license information and exit"));
 
     std::vector<CLI::Option> options;
-    options.push_back(CLI::Option('c', "connect", "HOST", "connect to HOST, listen for incoming connections if omitted"));
-    options.push_back(CLI::Option('m', "mtu-optimize", "MTU", "Optimize for a specific maximum transfer unit by reading MTU bytes at a time."));
-    options.push_back(CLI::Option(
-        'p', "print-prefixes", "TCPin:UDPin:TCPout:UDPout",
-        "override default prefixes for output (defaults to spaces + coloring the output or \"t:u:T:U\" in no-color mode)"
-    ));
-    options.push_back(CLI::Option(
-        'i', "input-prefixes", "TCP:UDP",
-        "override default prefixes for input (defaults to \"t:u\")"
-    ));
+    options.push_back(CLI::Option('c', "connect", "HOST", "make an outgoing connection to HOST instead of listening for an incoming connection"));
 
     std::vector<CLI::Argument> arguments;
-    arguments.push_back(CLI::Argument("PORT", "the port to use"));
+    arguments.push_back(CLI::Argument("PORT", "the port to lsiten on (or connect to)"));
 
-    CLI::ArgumentsParser cliParser = CLI::ArgumentsParser(argc, argv, flags, options, arguments, "Arbitrary tcp/udp connections in hex format.");
+    CLI::ArgumentsParser cliParser = CLI::ArgumentsParser(argc, argv, flags, options, arguments, "Arbitrary TCP/UDP connections in hex format");
 
-    if (cliParser.getFlag("help").value){
+    if (cliParser.getFlag("help").value) {
         std::cout << cliParser.getUsage() << std::endl;
         return EXIT_SUCCESS;
     }
-    if (cliParser.getFlag("license").value){
+    if (cliParser.getFlag("license").value) {
         std::cout
             << "Copyright 2022, FOSS-VG Developers and Contributers\n"
             << "\n"
@@ -233,110 +91,18 @@ int main(int argc, char* argv[]){
             << std::endl;
         return EXIT_SUCCESS;
     }
-
     if (cliParser.wrongUsage) {
         std::cout << cliParser.getUsage() << std::endl;
         return EXIT_USAGE;
     }
-    if (cliParser.getFlag("ipv4").value || cliParser.getFlag("ipv6").value) {
-        ipv4 = cliParser.getFlag("ipv4").value;
-        ipv6 = cliParser.getFlag("ipv6").value;
-    }
-    if (cliParser.getFlag("tcp").value || cliParser.getFlag("udp").value) {
-        tcp = cliParser.getFlag("tcp").value;
-        udp = cliParser.getFlag("udp").value;
-    }
-    if (cliParser.getOption('c').errorCode == ErrorCodes::NOT_PRESENT) {
-        listenMode = true;
-    }
-    if (cliParser.getOption("mtu-optimize").errorCode == ErrorCodes::SUCCESS) {
-        mtu = std::stol(cliParser.getOption("mtu-optimize").value);
-    }
-    host = cliParser.getOption("connect").value;
-    //FIXME: use a function that returns a fixed-width data type instead,
-    //       ensure that the given value is a valid port
-    port = (in_port_t) std::stoi(cliParser.getArgument(0).value);
 
-    if (listenMode) {
-        if (udp && ipv4) {
-            std::cerr << "Listening on port " << port << "." << std::endl;
+    ipv4 = cliParser.getFlag("ipv4").value;
+    ipv6 = cliParser.getFlag("ipv6").value;
+    tcp = cliParser.getFlag("tcp").value;
+    udp = cliParser.getFlag("udp").value;
 
-            if(!udpSocket->bind(sockpp::inet_address("localhost", port))){
-                std::cerr << "Error while binding UDP socket: " << udpSocket->last_error_str() << std::endl;
-                return EXIT_RUNTIME;
-            }
-
-            std::thread threadReadFromUDP = std::thread(readFromUDPSocket, udpSocket, mtu);
-            threadReadFromUDP.join();
-
-            delete udpSocket;
-            return EXIT_SUCCESS;
-        }
-
-        if (ipv6) {
-            std::cerr << "Listening on port " << port << "." << std::endl;
-
-            tcp6Acceptor = sockpp::tcp6_acceptor(port);
-
-            if(!tcp6Acceptor){
-                std::cerr << "Error while creating TCP6 acceptor: " << tcp6Acceptor.last_error_str() << std::endl;
-                return EXIT_RUNTIME;
-            }
-
-            sockpp::inet6_address peer;
-            tcp6Socket = new sockpp::tcp6_socket();
-            *tcp6Socket = tcp6Acceptor.accept(&peer);
-
-            std::cerr << "Incoming connection from " << peer << std::endl;
-
-            if (!(*tcp6Socket)) {
-                std::cerr << "Error on incoming connection: " << tcp6Acceptor.last_error_str() << std::endl;
-                delete tcp6Socket;
-                return EXIT_RUNTIME;
-            }
-
-            std::thread threadReadFromTCP6 = std::thread(readFromTCP6Socket, tcp6Socket, mtu);
-            threadReadFromTCP6.join();
-
-            delete tcp6Socket;
-            return EXIT_SUCCESS;
-        }
-
-        if(ipv4){
-            std::cerr << "Listening on port " << port << "." << std::endl;
-
-
-            tcpAcceptor = sockpp::tcp_acceptor(port);
-
-            if (!tcpAcceptor) {
-                std::cerr << "Error while creating TCP acceptor: " << tcpAcceptor.last_error_str() << std::endl;
-                return EXIT_RUNTIME;
-            }
-
-            sockpp::inet_address peer;
-            tcpSocket = new sockpp::tcp_socket();
-            *tcpSocket = tcpAcceptor.accept(&peer);
-
-            std::cerr << "Incoming connection from " << peer << std::endl;
-
-            if (!(*tcpSocket)) {
-                std::cerr << "Error on incoming connection: " << tcpAcceptor.last_error_str() << std::endl;
-                delete tcpSocket;
-                return EXIT_RUNTIME;
-            }
-
-            std::thread threadReadFromTCP = std::thread(readFromTCPSocket, tcpSocket, mtu);
-            std::thread threadReadFromConsole = std::thread(readFromConsole);
-
-            threadReadFromConsole.join();
-            threadReadFromTCP.join();
-
-            delete tcpSocket;
-            return EXIT_SUCCESS;
-        }
-
-    } else {
-        std::cerr << "Client mode is not implemented yet." << std::endl;
-        return EXIT_UNIMPLEMENTED;
+    if (!(ipv4 || ipv6) || !(tcp || udp)) {
+        std::cout << cliParser.getUsage() << std::endl;
+        return EXIT_USAGE;
     }
 }