1/*
2 * Copyright (c) 1983, 1993
3 *	The Regents of the University of California.  All rights reserved.
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 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <sys/cdefs.h>
35
36#ifndef __APPLE__
37__FBSDID("$FreeBSD: src/usr.bin/talk/io.c,v 1.16 2004/05/10 15:52:16 cognet Exp $");
38
39#ifndef lint
40static const char sccsid[] = "@(#)io.c	8.1 (Berkeley) 6/6/93";
41#endif
42#endif /* __APPLE__ */
43
44/*
45 * This file contains the I/O handling and the exchange of
46 * edit characters. This connection itself is established in
47 * ctl.c
48 */
49
50#include <sys/filio.h>
51#ifdef __APPLE__
52#include <sys/ioctl.h>
53#endif
54
55#include <errno.h>
56#include <signal.h>
57#include <netdb.h>
58#include <stdlib.h>
59#include <string.h>
60#include <unistd.h>
61
62#include "talk.h"
63#include "talk_ctl.h"
64
65#define A_LONG_TIME 10000000
66
67volatile sig_atomic_t gotwinch = 0;
68
69/*
70 * The routine to do the actual talking
71 */
72void
73talk()
74{
75	struct hostent *hp, *hp2;
76	int nb;
77	fd_set read_set, read_template;
78	char buf[BUFSIZ], **addr, *his_machine_name;
79	struct timeval wait;
80
81	his_machine_name = NULL;
82	hp = gethostbyaddr((const char *)&his_machine_addr.s_addr,
83	    sizeof(his_machine_addr.s_addr), AF_INET);
84	if (hp != NULL) {
85		hp2 = gethostbyname(hp->h_name);
86		if (hp2 != NULL && hp2->h_addrtype == AF_INET &&
87		    hp2->h_length == sizeof(his_machine_addr))
88			for (addr = hp2->h_addr_list; *addr != NULL; addr++)
89				if (memcmp(*addr, &his_machine_addr,
90				    sizeof(his_machine_addr)) == 0) {
91					his_machine_name = strdup(hp->h_name);
92					break;
93				}
94	}
95	if (his_machine_name == NULL)
96		his_machine_name = strdup(inet_ntoa(his_machine_addr));
97	snprintf(buf, sizeof(buf), "Connection established with %s@%s.",
98	    msg.r_name, his_machine_name);
99	free(his_machine_name);
100	message(buf);
101	write(STDOUT_FILENO, "\007\007\007", 3);
102
103	current_line = 0;
104
105	/*
106	 * Wait on both the other process (sockt_mask) and
107	 * standard input ( STDIN_MASK )
108	 */
109	FD_ZERO(&read_template);
110	FD_SET(sockt, &read_template);
111	FD_SET(fileno(stdin), &read_template);
112	for (;;) {
113		read_set = read_template;
114		wait.tv_sec = A_LONG_TIME;
115		wait.tv_usec = 0;
116		nb = select(sockt + 1, &read_set, 0, 0, &wait);
117		if (gotwinch) {
118			resize_display();
119			gotwinch = 0;
120		}
121		if (nb <= 0) {
122			if (errno == EINTR) {
123				read_set = read_template;
124				continue;
125			}
126			/* panic, we don't know what happened */
127			p_error("Unexpected error from select");
128			quit();
129		}
130		if (FD_ISSET(sockt, &read_set)) {
131			/* There is data on sockt */
132			nb = read(sockt, buf, sizeof buf);
133			if (nb <= 0) {
134				message("Connection closed. Exiting");
135				quit();
136			}
137			display(&his_win, buf, nb);
138		}
139		if (FD_ISSET(fileno(stdin), &read_set)) {
140			/*
141			 * We can't make the tty non_blocking, because
142			 * curses's output routines would screw up
143			 */
144			int i;
145			ioctl(0, FIONREAD, (void *) &nb);
146			if (nb > sizeof buf)
147				nb = sizeof buf;
148			nb = read(STDIN_FILENO, buf, nb);
149			display(&my_win, buf, nb);
150			/* might lose data here because sockt is non-blocking */
151			for (i = 0; i < nb; ++i)
152				if (buf[i] == '\r')
153					buf[i] = '\n';
154			write(sockt, buf, nb);
155		}
156	}
157}
158
159/*
160 * p_error prints the system error message on the standard location
161 * on the screen and then exits. (i.e. a curses version of perror)
162 */
163void
164p_error(string)
165	const char *string;
166{
167	wmove(my_win.x_win, current_line, 0);
168	wprintw(my_win.x_win, "[%s : %s (%d)]\n",
169	    string, strerror(errno), errno);
170	wrefresh(my_win.x_win);
171	move(LINES-1, 0);
172	refresh();
173	quit();
174}
175
176/*
177 * Display string in the standard location
178 */
179void
180message(string)
181	const char *string;
182{
183	wmove(my_win.x_win, current_line, 0);
184	wprintw(my_win.x_win, "[%s]\n", string);
185	if (current_line < my_win.x_nlines - 1)
186		current_line++;
187	wrefresh(my_win.x_win);
188}
189