term.c revision 5579:29cd33ac16cb 
1/* $OpenBSD: netcat.c,v 1.57 2002/12/30 18:00:18 stevesk Exp $ */
2/*
3 * Copyright (c) 2001 Eric Jackson <ericj@monkey.org>
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 *   notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *   notice, this list of conditions and the following disclaimer in the
13 *   documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 *   derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <sys/types.h>
30#include <sys/socket.h>
31#include <sys/termios.h>
32#include <sys/time.h>
33#include <sys/un.h>
34
35#include <netinet/in.h>
36#include <arpa/telnet.h>
37
38#include <err.h>
39#include <errno.h>
40#include <netdb.h>
41#include <poll.h>
42#include <stdarg.h>
43#include <stdio.h>
44#include <stdlib.h>
45#include <string.h>
46#include <unistd.h>
47#include <fcntl.h>
48
49ssize_t atomicio(ssize_t (*)(), int, void *, size_t);
50void    readwrite(int);
51int     remote_connect(char *, char *, struct addrinfo);
52
53struct  termios saved_ios;
54void    raw_term();
55void    restore_term();
56
57char    progname[256];
58void    usage(int);
59
60int
61main(int argc, char *argv[])
62{
63    int ch, s, ret;
64    char *host, *port, *endp;
65    struct addrinfo hints;
66    socklen_t len;
67
68    ret = 1;
69    s = 0;
70    host = NULL;
71    port = NULL;
72    endp = NULL;
73
74    strncpy(progname, argv[0], sizeof progname);
75
76    /* Cruft to make sure options are clean, and used properly. */
77    if (argc == 2) {
78        host = "localhost";
79        port = argv[1];
80    } else if (argc == 3) {
81        host = argv[1];
82        port = argv[2];
83    } else {
84        usage(1);
85    }
86
87    if (!isatty(STDIN_FILENO))
88        errx(1, "not attached to a terminal");
89
90    raw_term();
91
92    /* Initialize addrinfo structure */
93    memset(&hints, 0, sizeof(struct addrinfo));
94    hints.ai_family = AF_UNSPEC;
95    hints.ai_socktype = SOCK_STREAM;
96    hints.ai_protocol = IPPROTO_TCP;
97
98    s = remote_connect(host, port, hints);
99    ret = 0;
100    readwrite(s);
101
102    if (s)
103        close(s);
104
105    exit(ret);
106}
107
108/*
109 * remote_connect()
110 * Return's a socket connected to a remote host. Properly bind's to a local
111 * port or source address if needed. Return's -1 on failure.
112 */
113int
114remote_connect(char *host, char *port, struct addrinfo hints)
115{
116    struct addrinfo *res, *res0;
117    int s, error;
118
119    if ((error = getaddrinfo(host, port, &hints, &res)))
120        errx(1, "getaddrinfo: %s", gai_strerror(error));
121
122    res0 = res;
123    do {
124        if ((s = socket(res0->ai_family, res0->ai_socktype,
125                        res0->ai_protocol)) < 0)
126            continue;
127
128        if (connect(s, res0->ai_addr, res0->ai_addrlen) == 0)
129            break;
130
131        close(s);
132        s = -1;
133    } while ((res0 = res0->ai_next) != NULL);
134
135    freeaddrinfo(res);
136
137    return (s);
138}
139
140/*
141 * readwrite()
142 * Loop that selects on the network file descriptor and stdin.
143 * Changed from poll() by Ali Saidi to make work on Mac OS X >= 10.4
144 */
145void
146readwrite(int nfd)
147{
148    fd_set read_fds;
149    char buf[BUFSIZ];
150    int wfd = fileno(stdin), n, ret, max_fd;
151    int lfd = fileno(stdout);
152    int escape = 0;
153    struct timeval timeout;
154
155    if (nfd == -1)
156        return;
157
158    FD_ZERO(&read_fds);
159
160    FD_SET(wfd, &read_fds);
161    FD_SET(nfd, &read_fds);
162    max_fd = nfd + 1;
163
164    timeout.tv_sec = 1;
165    timeout.tv_usec = 0;
166
167    while (1) {
168        n = select(max_fd, &read_fds, NULL, NULL, &timeout);
169        if (n < 0) {
170            close(nfd);
171            perror("Select Error:");
172        }
173
174        if (n == 0) {
175            if (read(nfd, buf, 0) < 0)
176                return;
177            goto setup_select;
178        }
179
180        if (read(nfd, buf, 0) < 0)
181            return;
182
183        if (FD_ISSET(nfd, &read_fds)) {
184            if ((n = read(nfd, buf, sizeof(buf))) < 0)
185                return;
186            else if (n == 0) {
187                shutdown(nfd, SHUT_RD);
188                return;
189            } else {
190                if ((ret = atomicio(write, lfd, buf, n)) != n)
191                    return;
192            }
193        }
194
195        if (FD_ISSET(wfd, &read_fds)) {
196            if ((n = read(wfd, buf, sizeof(buf))) < 0)
197                return;
198            else if (n == 0) {
199                shutdown(nfd, SHUT_WR);
200            } else {
201                if (escape) {
202                    char buf2[] = "~";
203                    if (*buf == '.') {
204                        printf("quit!\n");
205                        return;
206                    }
207                    escape = 0;
208                    if (*buf != '~' &&
209                        (ret = atomicio(write, nfd, buf2, 1)) != n)
210                        return;
211                } else {
212                    escape = (*buf == '~');
213                    if (escape)
214                        continue;
215                }
216
217                if ((ret = atomicio(write, nfd, buf, n)) != n)
218                    return;
219            }
220        }
221setup_select:
222    FD_ZERO(&read_fds);
223    FD_SET(wfd, &read_fds);
224    FD_SET(nfd, &read_fds);
225    timeout.tv_sec = 1;
226    timeout.tv_usec = 0;
227    } // while
228}
229
230void
231usage(int ret)
232{
233    fprintf(stderr, "usage: %s hostname port\n", progname);
234    if (ret)
235        exit(1);
236}
237
238/*
239 * Copyright (c) 1995,1999 Theo de Raadt.  All rights reserved.
240 * All rights reserved.
241 *
242 * Redistribution and use in source and binary forms, with or without
243 * modification, are permitted provided that the following conditions
244 * are met:
245 * 1. Redistributions of source code must retain the above copyright
246 *    notice, this list of conditions and the following disclaimer.
247 * 2. Redistributions in binary form must reproduce the above copyright
248 *    notice, this list of conditions and the following disclaimer in the
249 *    documentation and/or other materials provided with the distribution.
250 *
251 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
252 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
253 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
254 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
255 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
256 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
257 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
258 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
259 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
260 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
261 */
262
263/*
264 * ensure all of data on socket comes through. f==read || f==write
265 */
266ssize_t
267atomicio(ssize_t (*f) (), int fd, void *_s, size_t n)
268{
269    char *s = _s;
270    ssize_t res, pos = 0;
271
272    while (n > pos) {
273        res = (f) (fd, s + pos, n - pos);
274        switch (res) {
275          case -1:
276            if (errno == EINTR || errno == EAGAIN)
277                continue;
278          case 0:
279            return (res);
280          default:
281            pos += res;
282        }
283    }
284    return (pos);
285}
286
287/*
288 * Copyright (c) 2003 Nathan L. Binkert <binkertn@umich.edu>
289 *
290 * Permission to use, copy, modify, and distribute this software for any
291 * purpose with or without fee is hereby granted, provided that the above
292 * copyright notice and this permission notice appear in all copies.
293 *
294 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
295 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
296 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
297 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
298 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
299 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
300 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
301 */
302
303void
304raw_term()
305{
306    struct termios ios;
307
308    if (tcgetattr(STDIN_FILENO, &ios) < 0)
309        errx(1, "tcgetagttr\n");
310
311    memcpy(&saved_ios, &ios, sizeof(struct termios));
312
313    ios.c_iflag &= ~(ISTRIP|ICRNL|IGNCR|ICRNL|IXOFF|IXON);
314    ios.c_oflag &= ~(OPOST);
315    ios.c_oflag &= (ONLCR);
316    ios.c_lflag &= ~(ISIG|ICANON|ECHO);
317    ios.c_cc[VMIN] = 1;
318    ios.c_cc[VTIME] = 0;
319
320    if (tcsetattr(STDIN_FILENO, TCSANOW, &ios) < 0)
321        errx(1, "tcsetattr\n");
322
323    atexit(restore_term);
324}
325
326void
327restore_term()
328{
329    tcsetattr(STDIN_FILENO, TCSANOW, &saved_ios);
330}
331