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
56 extern void display(xwin_t *, wchar_t *);
57
58 volatile sig_atomic_t gotwinch = 0;
59
60 /*
61 * The routine to do the actual talking
62 */
63 void
talk(void)64 talk(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 */
150 void
p_error(const char * string)151 p_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 */
165 void
message(const char * string)166 message(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