io.c revision 273496 
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: stable/10/usr.bin/talk/io.c 273496 2014-10-23 00:39:19Z ngie $");
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 <stdio.h>
50#include <stdlib.h>
51#include <string.h>
52#include <unistd.h>
53#define _XOPEN_SOURCE_EXTENDED
54#include <curses.h>
55
56#include "talk.h"
57#include "talk_ctl.h"
58
59extern void	display(xwin_t *, wchar_t *);
60
61volatile sig_atomic_t gotwinch = 0;
62
63/*
64 * The routine to do the actual talking
65 */
66void
67talk(void)
68{
69	struct hostent *hp, *hp2;
70	int nb;
71	fd_set read_set;
72	wchar_t buf[BUFSIZ];
73	char **addr, *his_machine_name;
74	FILE *sockfp;
75
76	his_machine_name = NULL;
77	hp = gethostbyaddr((const char *)&his_machine_addr.s_addr,
78	    sizeof(his_machine_addr.s_addr), AF_INET);
79	if (hp != NULL) {
80		hp2 = gethostbyname(hp->h_name);
81		if (hp2 != NULL && hp2->h_addrtype == AF_INET &&
82		    hp2->h_length == sizeof(his_machine_addr))
83			for (addr = hp2->h_addr_list; *addr != NULL; addr++)
84				if (memcmp(*addr, &his_machine_addr,
85				    sizeof(his_machine_addr)) == 0) {
86					his_machine_name = strdup(hp->h_name);
87					break;
88				}
89	}
90	if (his_machine_name == NULL)
91		his_machine_name = strdup(inet_ntoa(his_machine_addr));
92	snprintf((char *)buf, sizeof(buf), "Connection established with %s@%s.",
93	    msg.r_name, his_machine_name);
94	free(his_machine_name);
95	message((char *)buf);
96	write(STDOUT_FILENO, "\007\007\007", 3);
97
98	current_line = 0;
99
100	if ((sockfp = fdopen(sockt, "w+")) == NULL)
101		p_error("fdopen");
102
103	setvbuf(sockfp, NULL, _IONBF, 0);
104	setvbuf(stdin, NULL, _IONBF, 0);
105
106	/*
107	 * Wait on both the other process (sockt) and standard input.
108	 */
109	for (;;) {
110		FD_ZERO(&read_set);
111		FD_SET(sockt, &read_set);
112		FD_SET(fileno(stdin), &read_set);
113		nb = select(32, &read_set, 0, 0, NULL);
114		if (gotwinch) {
115			resize_display();
116			gotwinch = 0;
117		}
118		if (nb <= 0) {
119			if (errno == EINTR)
120				continue;
121			/* Panic, we don't know what happened. */
122			p_error("Unexpected error from select");
123			quit();
124		}
125		if (FD_ISSET(sockt, &read_set)) {
126			wint_t w;
127
128			/* There is data on sockt. */
129			w = fgetwc(sockfp);
130			if (w == WEOF) {
131				message("Connection closed. Exiting");
132				quit();
133			}
134			display(&his_win, &w);
135		}
136		if (FD_ISSET(fileno(stdin), &read_set)) {
137			wint_t w;
138
139			if ((w = getwchar()) != WEOF) {
140				display(&my_win, &w);
141				(void )fputwc(w, sockfp);
142				(void )fflush(sockfp);
143			}
144		}
145	}
146}
147
148/*
149 * p_error prints the system error message on the standard location
150 * on the screen and then exits. (i.e. a curses version of perror)
151 */
152void
153p_error(const char *string)
154{
155	wmove(my_win.x_win, current_line, 0);
156	wprintw(my_win.x_win, "[%s : %s (%d)]\n",
157	    string, strerror(errno), errno);
158	wrefresh(my_win.x_win);
159	move(LINES-1, 0);
160	refresh();
161	quit();
162}
163
164/*
165 * Display string in the standard location
166 */
167void
168message(const char *string)
169{
170	wmove(my_win.x_win, current_line, 0);
171	wprintw(my_win.x_win, "[%s]\n", string);
172	if (current_line < my_win.x_nlines - 1)
173		current_line++;
174	wrefresh(my_win.x_win);
175}
176