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