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