314 lines
8.8 KiB
C
314 lines
8.8 KiB
C
/* $OpenBSD: netcat.c,v 1.57 2002/12/30 18:00:18 stevesk Exp $ */
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/*
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* Copyright (c) 2001 Eric Jackson <ericj@monkey.org>
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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
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/termios.h>
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#include <sys/time.h>
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#include <sys/un.h>
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#include <netinet/in.h>
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#include <arpa/telnet.h>
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#include <err.h>
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#include <errno.h>
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#include <netdb.h>
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#include <poll.h>
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#include <stdarg.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 <unistd.h>
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#include <fcntl.h>
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ssize_t atomicio(ssize_t (*)(), int, void *, size_t);
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void readwrite(int);
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int remote_connect(char *, char *, struct addrinfo);
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struct termios saved_ios;
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void raw_term();
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void restore_term();
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char progname[256];
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void usage(int);
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int
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main(int argc, char *argv[])
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{
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int ch, s, ret;
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char *host, *port, *endp;
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struct addrinfo hints;
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socklen_t len;
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ret = 1;
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s = 0;
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host = NULL;
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port = NULL;
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endp = NULL;
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strncpy(progname, argv[0], sizeof progname);
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/* Cruft to make sure options are clean, and used properly. */
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if (argc == 2) {
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host = "localhost";
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port = argv[1];
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} else if (argc == 3) {
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host = argv[1];
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port = argv[2];
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} else {
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usage(1);
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}
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if (!isatty(STDIN_FILENO))
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errx(1, "not attached to a terminal");
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raw_term();
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/* Initialize addrinfo structure */
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memset(&hints, 0, sizeof(struct addrinfo));
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_protocol = IPPROTO_TCP;
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s = remote_connect(host, port, hints);
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ret = 0;
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readwrite(s);
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if (s)
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close(s);
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exit(ret);
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}
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/*
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* remote_connect()
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* Return's a socket connected to a remote host. Properly bind's to a local
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* port or source address if needed. Return's -1 on failure.
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*/
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int
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remote_connect(char *host, char *port, struct addrinfo hints)
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{
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struct addrinfo *res, *res0;
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int s, error;
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if ((error = getaddrinfo(host, port, &hints, &res)))
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errx(1, "getaddrinfo: %s", gai_strerror(error));
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res0 = res;
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do {
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if ((s = socket(res0->ai_family, res0->ai_socktype,
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res0->ai_protocol)) < 0)
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continue;
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if (connect(s, res0->ai_addr, res0->ai_addrlen) == 0)
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break;
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close(s);
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s = -1;
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} while ((res0 = res0->ai_next) != NULL);
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freeaddrinfo(res);
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return (s);
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}
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/*
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* readwrite()
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* Loop that polls on the network file descriptor and stdin.
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*/
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void
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readwrite(int nfd)
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{
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struct pollfd pfd[2];
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char buf[BUFSIZ];
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int wfd = fileno(stdin), n, ret;
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int lfd = fileno(stdout);
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int escape = 0;
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/* Setup Network FD */
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pfd[0].fd = nfd;
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pfd[0].events = POLLIN;
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/* Setup STDIN FD */
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pfd[1].fd = wfd;
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pfd[1].events = POLLIN;
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while (pfd[0].fd != -1) {
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if ((n = poll(pfd, 2, -1)) < 0) {
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close(nfd);
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err(1, "Polling Error");
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}
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if (n == 0)
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return;
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if (pfd[0].revents & POLLIN) {
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if ((n = read(nfd, buf, sizeof(buf))) < 0)
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return;
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else if (n == 0) {
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shutdown(nfd, SHUT_RD);
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pfd[0].fd = -1;
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pfd[0].events = 0;
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} else {
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if ((ret = atomicio(write, lfd, buf, n)) != n)
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return;
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}
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}
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if (pfd[1].revents & POLLIN) {
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if ((n = read(wfd, buf, sizeof(buf))) < 0)
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return;
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else if (n == 0) {
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shutdown(nfd, SHUT_WR);
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pfd[1].fd = -1;
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pfd[1].events = 0;
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} else {
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if (escape) {
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char buf2[] = "~";
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if (*buf == '.') {
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printf("quit!\n");
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return;
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}
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escape = 0;
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if (*buf != '~' &&
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(ret = atomicio(write, nfd, buf2, 1)) != n)
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return;
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} else {
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escape = (*buf == '~');
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if (escape)
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continue;
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}
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if ((ret = atomicio(write, nfd, buf, n)) != n)
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return;
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}
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}
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}
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}
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void
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usage(int ret)
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{
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fprintf(stderr, "usage: %s hostname port\n", progname);
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if (ret)
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exit(1);
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}
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/*
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* Copyright (c) 1995,1999 Theo de Raadt. All rights reserved.
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* ensure all of data on socket comes through. f==read || f==write
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*/
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ssize_t
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atomicio(ssize_t (*f) (), int fd, void *_s, size_t n)
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{
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char *s = _s;
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ssize_t res, pos = 0;
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while (n > pos) {
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res = (f) (fd, s + pos, n - pos);
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switch (res) {
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case -1:
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if (errno == EINTR || errno == EAGAIN)
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continue;
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case 0:
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return (res);
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default:
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pos += res;
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}
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}
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return (pos);
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}
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/*
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* Copyright (c) 2003 Nathan L. Binkert <binkertn@umich.edu>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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void
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raw_term()
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{
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struct termios ios;
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if (tcgetattr(STDIN_FILENO, &ios) < 0)
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errx(1, "tcgetagttr\n");
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memcpy(&saved_ios, &ios, sizeof(struct termios));
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ios.c_iflag &= ~(ISTRIP|ICRNL|IGNCR|ICRNL|IXOFF|IXON);
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ios.c_oflag &= ~(OPOST);
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ios.c_oflag &= (ONLCR);
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ios.c_lflag &= ~(ISIG|ICANON|ECHO);
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ios.c_cc[VMIN] = 1;
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ios.c_cc[VTIME] = 0;
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if (tcsetattr(STDIN_FILENO, TCSANOW, &ios) < 0)
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errx(1, "tcsetattr\n");
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atexit(restore_term);
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}
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void
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restore_term()
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{
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tcsetattr(STDIN_FILENO, TCSANOW, &saved_ios);
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}
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