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Userland: Implement -l, -v, -N, -s, and -p for netcat
This commit is contained in:
Conrad Pankoff
Andreas Kling
parent
fbcf51f81b
commit
fffd3a67ad
Notes:
sideshowbarker
2024-07-19 12:49:28 +09:00
Author: https://github.com/deoxxa Commit: https://github.com/SerenityOS/serenity/commit/fffd3a67ade Pull-request: https://github.com/SerenityOS/serenity/pull/420 Reviewed-by: https://github.com/awesomekling ✅
1 changed files with 170 additions and 56 deletions
226
Userland/nc.cpp
226
Userland/nc.cpp
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@ -1,4 +1,6 @@
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#include <arpa/inet.h>
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#include <errno.h>
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#include <getopt.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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@ -11,68 +13,174 @@
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#define max(a, b) ((a > b) ? a : b)
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void exit_with_usage(int rc)
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{
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fprintf(stderr, "Usage: nc [-l] [-v] [-h] [-N] [-s source] [-p source_port] [destination] [port]\n");
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exit(rc);
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}
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int main(int argc, char** argv)
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{
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if (argc < 3) {
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fprintf(stderr, "Usage: nc <host> <port>\n");
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return -1;
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bool should_listen = false;
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bool verbose = false;
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char *source_addr = nullptr;
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int source_port = 0;
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bool should_close = false;
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int opt;
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while ((opt = getopt(argc, argv, "hlvs:p:N")) != -1) {
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switch (opt) {
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case 'h':
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exit_with_usage(0);
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break;
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case 'l':
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should_listen = true;
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break;
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case 'v':
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verbose = true;
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break;
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case 's':
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source_addr = strdup(optarg);
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break;
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case 'p':
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source_port = atoi(optarg);
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break;
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case 'N':
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should_close = true;
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break;
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}
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}
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const char* addr_str = argv[1];
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int port = atoi(argv[2]);
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int fd;
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int 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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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(source_port);
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sa.sin_addr.s_addr = htonl(INADDR_ANY);
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if (source_addr) {
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if (inet_pton(AF_INET, source_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 = 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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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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if ((argc - optind) < 2) {
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exit_with_usage(-1);
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}
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const char* addr_arg = argv[optind];
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int port_arg = atoi(argv[optind + 1]);
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if (port_arg < 0) {
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perror("atoi");
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return 1;
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}
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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_arg);
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if (inet_pton(AF_INET, addr_arg, &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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struct timeval timeout {
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3, 0
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};
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int rc = setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
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if (rc < 0) {
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perror("setsockopt");
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return 1;
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}
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rc = setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout));
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if (rc < 0) {
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perror("setsockopt");
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return 1;
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}
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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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rc = inet_pton(AF_INET, addr_str, &dst_addr.sin_addr);
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if (rc <= 0) {
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perror("inet_pton");
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return 1;
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}
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rc = connect(fd, (struct sockaddr*)&dst_addr, sizeof(dst_addr));
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if (rc < 0) {
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perror("connect");
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return 1;
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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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for (;;) {
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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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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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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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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, NULL);
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if (ready == -1) {
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return 1;
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}
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if (FD_ISSET(STDIN_FILENO, &readfds)) {
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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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@ -93,16 +201,20 @@ int main(int argc, char** argv)
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// stdin closed
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if (nread == 0) {
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return 0;
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}
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if (write(fd, buf, 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_ISSET(fd, &readfds)) {
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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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@ -112,10 +224,12 @@ int main(int argc, char** argv)
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// remote end closed
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if (nread == 0) {
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return 0;
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}
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if (write(STDOUT_FILENO, buf, 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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