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 #ifndef lint
34 static const char sccsid[] = "@(#)io.c 8.1 (Berkeley) 6/6/93";
35 #endif
36
37 /*
38 * This file contains the I/O handling and the exchange of
39 * edit characters. This connection itself is established in
40 * ctl.c
41 */
42
43 #include <sys/filio.h>
44
45 #include <errno.h>
46 #include <signal.h>
47 #include <netdb.h>
48 #include <poll.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
59 extern void display(xwin_t *, wchar_t *);
60
61 volatile sig_atomic_t gotwinch = 0;
62
63 /*
64 * The routine to do the actual talking
65 */
66 void
talk(void)67 talk(void)
68 {
69 struct hostent *hp, *hp2;
70 struct pollfd fds[2];
71 int nb;
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 fds[0].fd = fileno(stdin);
111 fds[0].events = POLLIN;
112 fds[1].fd = sockt;
113 fds[1].events = POLLIN;
114 nb = poll(fds, 2, INFTIM);
115 if (gotwinch) {
116 resize_display();
117 gotwinch = 0;
118 }
119 if (nb <= 0) {
120 if (errno == EINTR)
121 continue;
122 /* Panic, we don't know what happened. */
123 p_error("Unexpected error from poll");
124 quit();
125 }
126 if (fds[1].revents & POLLIN) {
127 wint_t w;
128
129 /* There is data on sockt. */
130 w = fgetwc(sockfp);
131 if (w == WEOF) {
132 message("Connection closed. Exiting");
133 quit();
134 }
135 display(&his_win, &w);
136 }
137 if (fds[0].revents & POLLIN) {
138 wint_t w;
139
140 if ((w = getwchar()) != WEOF) {
141 display(&my_win, &w);
142 (void )fputwc(w, sockfp);
143 (void )fflush(sockfp);
144 }
145 }
146 }
147 }
148
149 /*
150 * p_error prints the system error message on the standard location
151 * on the screen and then exits. (i.e. a curses version of perror)
152 */
153 void
p_error(const char * string)154 p_error(const char *string)
155 {
156 wmove(my_win.x_win, current_line, 0);
157 wprintw(my_win.x_win, "[%s : %s (%d)]\n",
158 string, strerror(errno), errno);
159 wrefresh(my_win.x_win);
160 move(LINES-1, 0);
161 refresh();
162 quit();
163 }
164
165 /*
166 * Display string in the standard location
167 */
168 void
message(const char * string)169 message(const char *string)
170 {
171 wmove(my_win.x_win, current_line, 0);
172 wprintw(my_win.x_win, "[%s]\n", string);
173 if (current_line < my_win.x_nlines - 1)
174 current_line++;
175 wrefresh(my_win.x_win);
176 }
177