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
33
34/*
35 * This file contains the I/O handling and the exchange of
36 * edit characters. This connection itself is established in
37 * ctl.c
38 */
39
40#include <sys/filio.h>
41
42#include <errno.h>
43#include <signal.h>
44#include <netdb.h>
45#include <poll.h>
46#include <stdio.h>
47#include <stdlib.h>
48#include <string.h>
49#include <unistd.h>
50#define _XOPEN_SOURCE_EXTENDED
51#include <curses.h>
52
53#include "talk.h"
54#include "talk_ctl.h"
55
56extern void	display(xwin_t *, wchar_t *);
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	struct pollfd fds[2];
68	int nb;
69	wchar_t buf[BUFSIZ];
70	char **addr, *his_machine_name;
71	FILE *sockfp;
72
73	his_machine_name = NULL;
74	hp = gethostbyaddr((const char *)&his_machine_addr.s_addr,
75	    sizeof(his_machine_addr.s_addr), AF_INET);
76	if (hp != NULL) {
77		hp2 = gethostbyname(hp->h_name);
78		if (hp2 != NULL && hp2->h_addrtype == AF_INET &&
79		    hp2->h_length == sizeof(his_machine_addr))
80			for (addr = hp2->h_addr_list; *addr != NULL; addr++)
81				if (memcmp(*addr, &his_machine_addr,
82				    sizeof(his_machine_addr)) == 0) {
83					his_machine_name = strdup(hp->h_name);
84					break;
85				}
86	}
87	if (his_machine_name == NULL)
88		his_machine_name = strdup(inet_ntoa(his_machine_addr));
89	snprintf((char *)buf, sizeof(buf), "Connection established with %s@%s.",
90	    msg.r_name, his_machine_name);
91	free(his_machine_name);
92	message((char *)buf);
93	write(STDOUT_FILENO, "\007\007\007", 3);
94
95	current_line = 0;
96
97	if ((sockfp = fdopen(sockt, "w+")) == NULL)
98		p_error("fdopen");
99
100	setvbuf(sockfp, NULL, _IONBF, 0);
101	setvbuf(stdin, NULL, _IONBF, 0);
102
103	/*
104	 * Wait on both the other process (sockt) and standard input.
105	 */
106	for (;;) {
107		fds[0].fd = fileno(stdin);
108		fds[0].events = POLLIN;
109		fds[1].fd = sockt;
110		fds[1].events = POLLIN;
111		nb = poll(fds, 2, INFTIM);
112		if (gotwinch) {
113			resize_display();
114			gotwinch = 0;
115		}
116		if (nb <= 0) {
117			if (errno == EINTR)
118				continue;
119			/* Panic, we don't know what happened. */
120			p_error("Unexpected error from poll");
121			quit();
122		}
123		if (fds[1].revents & POLLIN) {
124			wint_t w;
125
126			/* There is data on sockt. */
127			w = fgetwc(sockfp);
128			if (w == WEOF) {
129				message("Connection closed. Exiting");
130				quit();
131			}
132			display(&his_win, &w);
133		}
134		if (fds[0].revents & POLLIN) {
135			wint_t w;
136
137			if ((w = getwchar()) != WEOF) {
138				display(&my_win, &w);
139				(void )fputwc(w, sockfp);
140				(void )fflush(sockfp);
141			}
142		}
143	}
144}
145
146/*
147 * p_error prints the system error message on the standard location
148 * on the screen and then exits. (i.e. a curses version of perror)
149 */
150void
151p_error(const char *string)
152{
153	wmove(my_win.x_win, current_line, 0);
154	wprintw(my_win.x_win, "[%s : %s (%d)]\n",
155	    string, strerror(errno), errno);
156	wrefresh(my_win.x_win);
157	move(LINES-1, 0);
158	refresh();
159	quit();
160}
161
162/*
163 * Display string in the standard location
164 */
165void
166message(const char *string)
167{
168	wmove(my_win.x_win, current_line, 0);
169	wprintw(my_win.x_win, "[%s]\n", string);
170	if (current_line < my_win.x_nlines - 1)
171		current_line++;
172	wrefresh(my_win.x_win);
173}
174