mirror of
https://github.com/LadybirdBrowser/ladybird.git
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294 lines
10 KiB
C++
294 lines
10 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/ByteBuffer.h>
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#include <AK/HashTable.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/EventLoop.h>
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#include <LibCore/Stream.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/select.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <unistd.h>
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// NOTE: `warnln` is used instead of `outln` because we want to redirect all
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// output to stderr to allow for commands like:
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//
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// nc -l someport > out.file
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//
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// Below man page was considered to come up default bounds
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// for SO_RCVBUF
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// https://man7.org/linux/man-pages/man7/socket.7.html
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static constexpr size_t maximum_tcp_receive_buffer_size_upper_bound = 212992;
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static constexpr size_t maximum_tcp_receive_buffer_size_lower_bound = 256;
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static size_t get_maximum_tcp_buffer_size(size_t input_buf_size)
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{
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if (input_buf_size < maximum_tcp_receive_buffer_size_lower_bound)
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return maximum_tcp_receive_buffer_size_lower_bound;
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if (input_buf_size > maximum_tcp_receive_buffer_size_upper_bound)
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return maximum_tcp_receive_buffer_size_upper_bound;
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return input_buf_size;
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};
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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bool should_listen = false;
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bool verbose = false;
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bool should_close = false;
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bool udp_mode = false;
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char const* target = nullptr;
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int port = 0;
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int maximum_tcp_receive_buffer_size_input = -1;
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Core::ArgsParser args_parser;
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args_parser.set_general_help("Network cat: Connect to network sockets as if it were a file.");
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args_parser.add_option(should_listen, "Listen instead of connecting", "listen", 'l');
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args_parser.add_option(verbose, "Log everything that's happening", "verbose", 'v');
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args_parser.add_option(udp_mode, "UDP mode", "udp", 'u');
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args_parser.add_option(should_close, "Close connection after reading stdin to the end", nullptr, 'N');
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args_parser.add_option(maximum_tcp_receive_buffer_size_input, "Set maximum tcp receive buffer size", "length", 'I', nullptr);
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args_parser.add_positional_argument(target, "Address to listen on, or the address or hostname to connect to", "target");
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args_parser.add_positional_argument(port, "Port to connect to or listen on", "port");
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args_parser.parse(arguments);
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if (udp_mode) {
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if (should_listen) {
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warnln("listening on UDP not yet supported");
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return 1;
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}
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Core::EventLoop loop;
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auto socket = TRY(Core::Stream::UDPSocket::connect(target, port));
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if (verbose)
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warnln("connected to {}:{}", target, port);
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Array<u8, 1024> buffer;
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for (;;) {
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Bytes buffer_span = buffer.span();
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auto nread = TRY(Core::System::read(STDIN_FILENO, buffer_span));
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buffer_span = buffer_span.trim(nread);
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TRY(socket->write({ buffer_span.data(), static_cast<size_t>(nread) }));
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}
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}
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int fd = -1;
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int listen_fd = -1;
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if (should_listen) {
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listen_fd = TRY(Core::System::socket(AF_INET, SOCK_STREAM, 0));
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sockaddr_in sa {};
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sa.sin_family = AF_INET;
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sa.sin_port = htons(port);
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sa.sin_addr.s_addr = htonl(INADDR_ANY);
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if (target) {
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if (inet_pton(AF_INET, target, &sa.sin_addr) <= 0) {
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perror("inet_pton");
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return 1;
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}
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}
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TRY(Core::System::bind(listen_fd, (struct sockaddr*)&sa, sizeof(sa)));
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TRY(Core::System::listen(listen_fd, 1));
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char addr_str[INET_ADDRSTRLEN];
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sockaddr_in sin;
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socklen_t len;
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len = sizeof(sin);
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TRY(Core::System::getsockname(listen_fd, (struct sockaddr*)&sin, &len));
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if (verbose)
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warnln("waiting for a connection on {}:{}", inet_ntop(sin.sin_family, &sin.sin_addr, addr_str, sizeof(addr_str) - 1), ntohs(sin.sin_port));
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} else {
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fd = TRY(Core::System::socket(AF_INET, SOCK_STREAM, 0));
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struct timeval timeout {
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3, 0
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};
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TRY(Core::System::setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout)));
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TRY(Core::System::setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout)));
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auto* hostent = gethostbyname(target);
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if (!hostent) {
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warnln("Socket::connect: Unable to resolve '{}'", target);
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return 1;
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}
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sockaddr_in dst_addr {};
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dst_addr.sin_family = AF_INET;
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dst_addr.sin_port = htons(port);
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dst_addr.sin_addr.s_addr = *(in_addr_t const*)hostent->h_addr_list[0];
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if (verbose) {
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char addr_str[INET_ADDRSTRLEN];
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warnln("connecting to {}:{}", inet_ntop(dst_addr.sin_family, &dst_addr.sin_addr, addr_str, sizeof(addr_str) - 1), ntohs(dst_addr.sin_port));
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}
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TRY(Core::System::connect(fd, (struct sockaddr*)&dst_addr, sizeof(dst_addr)));
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if (verbose)
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warnln("connected!");
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}
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HashTable<int> connected_clients;
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bool stdin_closed = false;
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bool fd_closed = false;
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bool listen_fd_closed = false;
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fd_set readfds, writefds, exceptfds;
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size_t receive_buffer_size = get_maximum_tcp_buffer_size(maximum_tcp_receive_buffer_size_input);
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if (verbose && (maximum_tcp_receive_buffer_size_input != -1)) {
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warnln("receive_buffer_size set to {}", receive_buffer_size);
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}
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while (!stdin_closed || !fd_closed || !listen_fd_closed) {
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FD_ZERO(&readfds);
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FD_ZERO(&writefds);
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FD_ZERO(&exceptfds);
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int highest_fd = 0;
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if (!stdin_closed) {
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FD_SET(STDIN_FILENO, &readfds);
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FD_SET(STDIN_FILENO, &exceptfds);
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highest_fd = max(highest_fd, STDIN_FILENO);
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}
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if (!fd_closed && fd) {
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FD_SET(fd, &readfds);
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FD_SET(fd, &exceptfds);
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highest_fd = max(highest_fd, fd);
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}
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if (!listen_fd_closed && listen_fd) {
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FD_SET(listen_fd, &readfds);
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FD_SET(listen_fd, &exceptfds);
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highest_fd = max(highest_fd, listen_fd);
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}
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bool has_clients = (should_listen && !connected_clients.is_empty());
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if (has_clients) {
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for (auto const& client_fd : connected_clients) {
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FD_SET(client_fd, &readfds);
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FD_SET(client_fd, &exceptfds);
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highest_fd = max(highest_fd, client_fd);
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}
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}
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int ready = select(highest_fd + 1, &readfds, &writefds, &exceptfds, nullptr);
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if (ready == -1) {
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if (errno == EINTR)
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continue;
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perror("select");
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return 1;
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}
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if (!stdin_closed && FD_ISSET(STDIN_FILENO, &readfds)) {
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Array<u8, 1024> buffer;
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Bytes buffer_span = buffer.span();
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auto nread = TRY(Core::System::read(STDIN_FILENO, buffer_span));
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buffer_span = buffer_span.trim(nread);
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// stdin closed
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if (nread == 0) {
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stdin_closed = true;
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if (verbose)
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warnln("stdin closed");
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if (should_close) {
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if (should_listen) {
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TRY(Core::System::close(listen_fd));
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listen_fd_closed = true;
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} else {
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TRY(Core::System::close(fd));
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fd_closed = true;
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}
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}
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} else {
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if (should_listen && has_clients) {
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for (auto const& client_fd : connected_clients)
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TRY(Core::System::write(client_fd, buffer_span));
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} else {
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TRY(Core::System::write(fd, buffer_span));
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}
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}
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}
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if (!fd_closed && FD_ISSET(fd, &readfds)) {
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auto buffer = TRY(ByteBuffer::create_uninitialized(receive_buffer_size));
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Bytes buffer_span = buffer.bytes();
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auto nread = TRY(Core::System::read(fd, buffer_span));
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buffer_span = buffer_span.trim(nread);
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// remote end closed
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if (nread == 0) {
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close(STDIN_FILENO);
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stdin_closed = true;
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fd_closed = true;
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if (verbose)
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warnln("remote closed");
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} else {
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TRY(Core::System::write(STDOUT_FILENO, buffer_span));
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}
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}
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if (!listen_fd_closed && FD_ISSET(listen_fd, &readfds)) {
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char client_str[INET_ADDRSTRLEN];
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sockaddr_in client;
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socklen_t clientlen = sizeof(client);
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int new_client = TRY(Core::System::accept(listen_fd, (struct sockaddr*)&client, &clientlen));
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connected_clients.set(new_client);
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if (verbose)
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warnln("got connection from {}:{}", inet_ntop(client.sin_family, &client.sin_addr, client_str, sizeof(client_str) - 1), ntohs(client.sin_port));
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}
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if (has_clients) {
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for (auto const client_fd : connected_clients) {
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if (FD_ISSET(client_fd, &readfds)) {
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Array<u8, 1024> buffer;
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Bytes buffer_span = buffer.span();
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auto nread = TRY(Core::System::read(client_fd, buffer_span));
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buffer_span = buffer_span.trim(nread);
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if (nread == 0) {
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if (verbose) {
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struct sockaddr_in client;
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socklen_t clientlen = sizeof(client);
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TRY(Core::System::getpeername(client_fd, (struct sockaddr*)&client, &clientlen));
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warnln("remote connection closed {}:{}", inet_ntoa(client.sin_addr), ntohs(client.sin_port));
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}
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connected_clients.remove(client_fd);
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close(client_fd);
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FD_CLR(client_fd, &readfds);
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FD_CLR(client_fd, &exceptfds);
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} else {
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TRY(Core::System::write(STDOUT_FILENO, buffer_span));
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}
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}
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}
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}
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}
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return 0;
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}
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