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