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 *

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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 polls on the network file descriptor and stdin.
143 */
144void
145readwrite(int nfd)
146{
147 struct pollfd pfd[2];
148 char buf[BUFSIZ];
149 int wfd = fileno(stdin), n, ret;
150 int lfd = fileno(stdout);
151 int escape = 0;
152
153 /* Setup Network FD */
154 pfd[0].fd = nfd;
155 pfd[0].events = POLLIN;
156
157 /* Setup STDIN FD */
158 pfd[1].fd = wfd;
159 pfd[1].events = POLLIN;
160
161 while (pfd[0].fd != -1) {
162 if ((n = poll(pfd, 2, -1)) < 0) {
163 close(nfd);
164 err(1, "Polling Error");
165 }
166
167 if (n == 0)
168 return;
169
170 if (pfd[0].revents & POLLIN) {
171 if ((n = read(nfd, buf, sizeof(buf))) < 0)
172 return;
173 else if (n == 0) {
174 shutdown(nfd, SHUT_RD);
175 pfd[0].fd = -1;
176 pfd[0].events = 0;
177 } else {
178 if ((ret = atomicio(write, lfd, buf, n)) != n)
179 return;
180 }
181 }
182
183 if (pfd[1].revents & POLLIN) {
184 if ((n = read(wfd, buf, sizeof(buf))) < 0)
185 return;
186 else if (n == 0) {
187 shutdown(nfd, SHUT_WR);
188 pfd[1].fd = -1;
189 pfd[1].events = 0;
190 } else {
191 if (escape) {
192 char buf2[] = "~";
193 if (*buf == '.') {
194 printf("quit!\n");
195 return;
196 }
197 escape = 0;
198 if (*buf != '~' &&
199 (ret = atomicio(write, nfd, buf2, 1)) != n)
200 return;
201 } else {
202 escape = (*buf == '~');
203 if (escape)
204 continue;
205 }
206
207 if ((ret = atomicio(write, nfd, buf, n)) != n)
208 return;
209 }
210 }
211 }
212}
213
214void
215usage(int ret)
216{
217 fprintf(stderr, "usage: %s hostname port\n", progname);
218 if (ret)
219 exit(1);
220}
221
222/*
223 * Copyright (c) 1995,1999 Theo de Raadt. All rights reserved.
224 * All rights reserved.
225 *
226 * Redistribution and use in source and binary forms, with or without
227 * modification, are permitted provided that the following conditions

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245 */
246
247/*
248 * ensure all of data on socket comes through. f==read || f==write
249 */
250ssize_t
251atomicio(ssize_t (*f) (), int fd, void *_s, size_t n)
252{
253 char *s = _s;
254 ssize_t res, pos = 0;
255
256 while (n > pos) {
257 res = (f) (fd, s + pos, n - pos);
258 switch (res) {
259 case -1:
260 if (errno == EINTR || errno == EAGAIN)
261 continue;
262 case 0:
263 return (res);
264 default:
265 pos += res;
266 }
267 }
268 return (pos);
269}
270
271/*
272 * Copyright (c) 2003 Nathan L. Binkert <binkertn@umich.edu>
273 *
274 * Permission to use, copy, modify, and distribute this software for any
275 * purpose with or without fee is hereby granted, provided that the above
276 * copyright notice and this permission notice appear in all copies.

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282 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
283 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
284 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
285 */
286
287void
288raw_term()
289{
290 struct termios ios;
291
292 if (tcgetattr(STDIN_FILENO, &ios) < 0)
293 errx(1, "tcgetagttr\n");
294
295 memcpy(&saved_ios, &ios, sizeof(struct termios));
296
297 ios.c_iflag &= ~(ISTRIP|ICRNL|IGNCR|ICRNL|IXOFF|IXON);
298 ios.c_oflag &= ~(OPOST);
299 ios.c_oflag &= (ONLCR);
300 ios.c_lflag &= ~(ISIG|ICANON|ECHO);
301 ios.c_cc[VMIN] = 1;
302 ios.c_cc[VTIME] = 0;
303
304 if (tcsetattr(STDIN_FILENO, TCSANOW, &ios) < 0)
305 errx(1, "tcsetattr\n");
306
307 atexit(restore_term);
308}
309
310void
311restore_term()
312{
313 tcsetattr(STDIN_FILENO, TCSANOW, &saved_ios);
314}