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: releng/11.0/usr.bin/talk/io.c 296054 2016-02-25 19:06:44Z pfg $");
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 <poll.h>
50#include <stdio.h>
51#include <stdlib.h>
52#include <string.h>
53#include <unistd.h>
54#define _XOPEN_SOURCE_EXTENDED
55#include <curses.h>
56
57#include "talk.h"
58#include "talk_ctl.h"
59
60extern void	display(xwin_t *, wchar_t *);
61
62volatile sig_atomic_t gotwinch = 0;
63
64/*
65 * The routine to do the actual talking
66 */
67void
68talk(void)
69{
70	struct hostent *hp, *hp2;
71	struct pollfd fds[2];
72	int nb;
73	wchar_t buf[BUFSIZ];
74	char **addr, *his_machine_name;
75	FILE *sockfp;
76
77	his_machine_name = NULL;
78	hp = gethostbyaddr((const char *)&his_machine_addr.s_addr,
79	    sizeof(his_machine_addr.s_addr), AF_INET);
80	if (hp != NULL) {
81		hp2 = gethostbyname(hp->h_name);
82		if (hp2 != NULL && hp2->h_addrtype == AF_INET &&
83		    hp2->h_length == sizeof(his_machine_addr))
84			for (addr = hp2->h_addr_list; *addr != NULL; addr++)
85				if (memcmp(*addr, &his_machine_addr,
86				    sizeof(his_machine_addr)) == 0) {
87					his_machine_name = strdup(hp->h_name);
88					break;
89				}
90	}
91	if (his_machine_name == NULL)
92		his_machine_name = strdup(inet_ntoa(his_machine_addr));
93	snprintf((char *)buf, sizeof(buf), "Connection established with %s@%s.",
94	    msg.r_name, his_machine_name);
95	free(his_machine_name);
96	message((char *)buf);
97	write(STDOUT_FILENO, "\007\007\007", 3);
98
99	current_line = 0;
100
101	if ((sockfp = fdopen(sockt, "w+")) == NULL)
102		p_error("fdopen");
103
104	setvbuf(sockfp, NULL, _IONBF, 0);
105	setvbuf(stdin, NULL, _IONBF, 0);
106
107	/*
108	 * Wait on both the other process (sockt) and standard input.
109	 */
110	for (;;) {
111		fds[0].fd = fileno(stdin);
112		fds[0].events = POLLIN;
113		fds[1].fd = sockt;
114		fds[1].events = POLLIN;
115		nb = poll(fds, 2, INFTIM);
116		if (gotwinch) {
117			resize_display();
118			gotwinch = 0;
119		}
120		if (nb <= 0) {
121			if (errno == EINTR)
122				continue;
123			/* Panic, we don't know what happened. */
124			p_error("Unexpected error from poll");
125			quit();
126		}
127		if (fds[1].revents & POLLIN) {
128			wint_t w;
129
130			/* There is data on sockt. */
131			w = fgetwc(sockfp);
132			if (w == WEOF) {
133				message("Connection closed. Exiting");
134				quit();
135			}
136			display(&his_win, &w);
137		}
138		if (fds[0].revents & POLLIN) {
139			wint_t w;
140
141			if ((w = getwchar()) != WEOF) {
142				display(&my_win, &w);
143				(void )fputwc(w, sockfp);
144				(void )fflush(sockfp);
145			}
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