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 * 3. 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 * @(#)io.c 8.1 (Berkeley) 6/6/93
30 * $FreeBSD: src/usr.bin/talk/io.c,v 1.9.2.2 2001/10/15 13:42:07 dd Exp $
31 */
32
33 /*
34 * This file contains the I/O handling and the exchange of
35 * edit characters. This connection itself is established in
36 * ctl.c
37 */
38
39 #include <errno.h>
40 #include <netdb.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <sys/filio.h>
44 #include "talk.h"
45 #include "talk_ctl.h"
46
47 #define A_LONG_TIME 10000000
48
49 /*
50 * The routine to do the actual talking
51 */
52 void
talk(void)53 talk(void)
54 {
55 struct hostent *hp, *hp2;
56 int nb;
57 fd_set read_set, read_template;
58 char buf[BUFSIZ], **addr, *his_machine_name;
59 struct timeval wait;
60
61 his_machine_name = NULL;
62 hp = gethostbyaddr(&his_machine_addr.s_addr,
63 sizeof(his_machine_addr.s_addr), AF_INET);
64 if (hp != NULL) {
65 hp2 = gethostbyname(hp->h_name);
66 if (hp2 != NULL && hp2->h_addrtype == AF_INET &&
67 hp2->h_length == sizeof(his_machine_addr))
68 for (addr = hp2->h_addr_list; *addr != NULL; addr++)
69 if (memcmp(*addr, &his_machine_addr,
70 sizeof(his_machine_addr)) == 0) {
71 his_machine_name = strdup(hp->h_name);
72 break;
73 }
74 }
75 if (his_machine_name == NULL)
76 his_machine_name = strdup(inet_ntoa(his_machine_addr));
77 snprintf(buf, sizeof(buf), "Connection established with %s@%s.",
78 msg.r_name, his_machine_name);
79 free(his_machine_name);
80 message(buf);
81 write(STDOUT_FILENO, "\007\007\007", 3);
82
83 current_line = 0;
84
85 /*
86 * Wait on both the other process (sockt_mask) and
87 * standard input ( STDIN_MASK )
88 */
89 FD_ZERO(&read_template);
90 FD_SET(sockt, &read_template);
91 FD_SET(fileno(stdin), &read_template);
92 for (;;) {
93 read_set = read_template;
94 wait.tv_sec = A_LONG_TIME;
95 wait.tv_usec = 0;
96 nb = select(32, &read_set, 0, 0, &wait);
97 if (nb <= 0) {
98 if (errno == EINTR) {
99 read_set = read_template;
100 continue;
101 }
102 /* panic, we don't know what happened */
103 p_error("Unexpected error from select");
104 quit();
105 }
106 if (FD_ISSET(sockt, &read_set)) {
107 /* There is data on sockt */
108 nb = read(sockt, buf, sizeof buf);
109 if (nb <= 0) {
110 message("Connection closed. Exiting");
111 quit();
112 }
113 display(&his_win, buf, nb);
114 }
115 if (FD_ISSET(fileno(stdin), &read_set)) {
116 /*
117 * We can't make the tty non_blocking, because
118 * curses's output routines would screw up
119 */
120 int i;
121 ioctl(0, FIONREAD, (struct sgttyb *) &nb);
122 nb = read(0, buf, nb);
123 display(&my_win, buf, nb);
124 /* might lose data here because sockt is non-blocking */
125 for (i = 0; i < nb; ++i)
126 if (buf[i] == '\r')
127 buf[i] = '\n';
128 write(sockt, buf, nb);
129 }
130 }
131 }
132
133 /*
134 * p_error prints the system error message on the standard location
135 * on the screen and then exits. (i.e. a curses version of perror)
136 */
137 void
p_error(const char * string)138 p_error(const char *string)
139 {
140 wmove(my_win.x_win, current_line, 0);
141 wprintw(my_win.x_win, "[%s : %s (%d)]\n",
142 string, strerror(errno), errno);
143 wrefresh(my_win.x_win);
144 move(LINES-1, 0);
145 refresh();
146 quit();
147 }
148
149 /*
150 * Display string in the standard location
151 */
152 void
message(const char * string)153 message(const char *string)
154 {
155 wmove(my_win.x_win, current_line, 0);
156 wprintw(my_win.x_win, "[%s]\n", string);
157 if (current_line < my_win.x_nlines - 1)
158 current_line++;
159 wrefresh(my_win.x_win);
160 }
161