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Userland: Move command-line utilities to Userland/Utilities/
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parent
c4e2fd8123
commit
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142 changed files with 58 additions and 58 deletions
234
Userland/nc.cpp
234
Userland/nc.cpp
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/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <LibCore/ArgsParser.h>
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#include <arpa/inet.h>
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#include <errno.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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int main(int argc, char** argv)
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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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const char* addr = nullptr;
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int port = 0;
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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(should_close, "Close connection after reading stdin to the end", nullptr, 'N');
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args_parser.add_positional_argument(addr, "Address to connect to or listen on", "address");
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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(argc, argv);
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int fd;
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if (should_listen) {
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int listen_fd = socket(AF_INET, SOCK_STREAM, 0);
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if (listen_fd < 0) {
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perror("socket");
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return 1;
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}
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struct sockaddr_in sa;
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memset(&sa, 0, sizeof 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 (addr) {
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if (inet_pton(AF_INET, addr, &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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if (bind(listen_fd, (struct sockaddr*)&sa, sizeof(sa)) == -1) {
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perror("bind");
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return 1;
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}
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if (listen(listen_fd, 1) == -1) {
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perror("listen");
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return 1;
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}
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char addr_str[100];
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struct sockaddr_in sin;
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socklen_t len;
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len = sizeof(sin);
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if (getsockname(listen_fd, (struct sockaddr*)&sin, &len) == -1) {
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perror("getsockname");
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return 1;
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}
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if (verbose)
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fprintf(stderr, "waiting for a connection on %s:%d\n", inet_ntop(sin.sin_family, &sin.sin_addr, addr_str, sizeof(addr_str) - 1), ntohs(sin.sin_port));
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len = sizeof(sin);
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fd = accept(listen_fd, (struct sockaddr*)&sin, &len);
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if (fd == -1) {
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perror("accept");
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return 1;
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}
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if (verbose)
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fprintf(stderr, "got connection from %s:%d\n", inet_ntop(sin.sin_family, &sin.sin_addr, addr_str, sizeof(addr_str) - 1), ntohs(sin.sin_port));
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if (close(listen_fd) == -1) {
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perror("close");
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return 1;
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};
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} else {
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fd = socket(AF_INET, SOCK_STREAM, 0);
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if (fd < 0) {
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perror("socket");
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return 1;
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}
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struct timeval timeout {
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3, 0
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};
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if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout)) < 0) {
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perror("setsockopt");
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return 1;
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}
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if (setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout)) < 0) {
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perror("setsockopt");
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return 1;
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}
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char addr_str[100];
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struct sockaddr_in dst_addr;
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memset(&dst_addr, 0, sizeof(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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if (inet_pton(AF_INET, addr, &dst_addr.sin_addr) < 0) {
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perror("inet_pton");
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return 1;
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}
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if (verbose)
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fprintf(stderr, "connecting to %s:%d\n", 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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if (connect(fd, (struct sockaddr*)&dst_addr, sizeof(dst_addr)) < 0) {
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perror("connect");
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return 1;
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}
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if (verbose)
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fprintf(stderr, "connected!\n");
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}
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bool stdin_closed = false;
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bool fd_closed = false;
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fd_set readfds, writefds, exceptfds;
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while (!stdin_closed || !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) {
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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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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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char buf[1024];
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int nread = read(STDIN_FILENO, buf, sizeof(buf));
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if (nread < 0) {
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perror("read(STDIN_FILENO)");
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return 1;
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}
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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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fprintf(stderr, "stdin closed\n");
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if (should_close) {
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close(fd);
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fd_closed = true;
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}
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} else if (write(fd, buf, nread) < 0) {
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perror("write(fd)");
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return 1;
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}
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}
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if (!fd_closed && FD_ISSET(fd, &readfds)) {
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char buf[1024];
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int nread = read(fd, buf, sizeof(buf));
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if (nread < 0) {
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perror("read(fd)");
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return 1;
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}
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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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fprintf(stderr, "remote closed\n");
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} else if (write(STDOUT_FILENO, buf, nread) < 0) {
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perror("write(STDOUT_FILENO)");
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return 1;
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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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