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 #include <sys/cdefs.h>
33
34 __FBSDID("$FreeBSD: stable/12/usr.bin/talk/io.c 326025 2017-11-20 19:49:47Z pfg $");
35
36 #ifndef lint
37 static const char sccsid[] = "@(#)io.c 8.1 (Berkeley) 6/6/93";
38 #endif
39
40 /*
41 * This file contains the I/O handling and the exchange of
42 * edit characters. This connection itself is established in
43 * ctl.c
44 */
45
46 #include <sys/filio.h>
47
48 #include <errno.h>
49 #include <signal.h>
50 #include <netdb.h>
51 #include <poll.h>
52 #include <stdio.h>
53 #include <stdlib.h>
54 #include <string.h>
55 #include <unistd.h>
56 #define _XOPEN_SOURCE_EXTENDED
57 #include <curses.h>
58
59 #include "talk.h"
60 #include "talk_ctl.h"
61
62 extern void display(xwin_t *, wchar_t *);
63
64 volatile sig_atomic_t gotwinch = 0;
65
66 /*
67 * The routine to do the actual talking
68 */
69 void
talk(void)70 talk(void)
71 {
72 struct hostent *hp, *hp2;
73 struct pollfd fds[2];
74 int nb;
75 wchar_t buf[BUFSIZ];
76 char **addr, *his_machine_name;
77 FILE *sockfp;
78
79 his_machine_name = NULL;
80 hp = gethostbyaddr((const char *)&his_machine_addr.s_addr,
81 sizeof(his_machine_addr.s_addr), AF_INET);
82 if (hp != NULL) {
83 hp2 = gethostbyname(hp->h_name);
84 if (hp2 != NULL && hp2->h_addrtype == AF_INET &&
85 hp2->h_length == sizeof(his_machine_addr))
86 for (addr = hp2->h_addr_list; *addr != NULL; addr++)
87 if (memcmp(*addr, &his_machine_addr,
88 sizeof(his_machine_addr)) == 0) {
89 his_machine_name = strdup(hp->h_name);
90 break;
91 }
92 }
93 if (his_machine_name == NULL)
94 his_machine_name = strdup(inet_ntoa(his_machine_addr));
95 snprintf((char *)buf, sizeof(buf), "Connection established with %s@%s.",
96 msg.r_name, his_machine_name);
97 free(his_machine_name);
98 message((char *)buf);
99 write(STDOUT_FILENO, "\007\007\007", 3);
100
101 current_line = 0;
102
103 if ((sockfp = fdopen(sockt, "w+")) == NULL)
104 p_error("fdopen");
105
106 setvbuf(sockfp, NULL, _IONBF, 0);
107 setvbuf(stdin, NULL, _IONBF, 0);
108
109 /*
110 * Wait on both the other process (sockt) and standard input.
111 */
112 for (;;) {
113 fds[0].fd = fileno(stdin);
114 fds[0].events = POLLIN;
115 fds[1].fd = sockt;
116 fds[1].events = POLLIN;
117 nb = poll(fds, 2, INFTIM);
118 if (gotwinch) {
119 resize_display();
120 gotwinch = 0;
121 }
122 if (nb <= 0) {
123 if (errno == EINTR)
124 continue;
125 /* Panic, we don't know what happened. */
126 p_error("Unexpected error from poll");
127 quit();
128 }
129 if (fds[1].revents & POLLIN) {
130 wint_t w;
131
132 /* There is data on sockt. */
133 w = fgetwc(sockfp);
134 if (w == WEOF) {
135 message("Connection closed. Exiting");
136 quit();
137 }
138 display(&his_win, &w);
139 }
140 if (fds[0].revents & POLLIN) {
141 wint_t w;
142
143 if ((w = getwchar()) != WEOF) {
144 display(&my_win, &w);
145 (void )fputwc(w, sockfp);
146 (void )fflush(sockfp);
147 }
148 }
149 }
150 }
151
152 /*
153 * p_error prints the system error message on the standard location
154 * on the screen and then exits. (i.e. a curses version of perror)
155 */
156 void
p_error(const char * string)157 p_error(const char *string)
158 {
159 wmove(my_win.x_win, current_line, 0);
160 wprintw(my_win.x_win, "[%s : %s (%d)]\n",
161 string, strerror(errno), errno);
162 wrefresh(my_win.x_win);
163 move(LINES-1, 0);
164 refresh();
165 quit();
166 }
167
168 /*
169 * Display string in the standard location
170 */
171 void
message(const char * string)172 message(const char *string)
173 {
174 wmove(my_win.x_win, current_line, 0);
175 wprintw(my_win.x_win, "[%s]\n", string);
176 if (current_line < my_win.x_nlines - 1)
177 current_line++;
178 wrefresh(my_win.x_win);
179 }
180