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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 36 __FBSDID("$FreeBSD$"); 37 38 #ifndef lint 39 static const char sccsid[] = "@(#)io.c 8.1 (Berkeley) 6/6/93"; 40 #endif 41 42 /* 43 * This file contains the I/O handling and the exchange of 44 * edit characters. This connection itself is established in 45 * ctl.c 46 */ 47 48 #include <sys/filio.h> 49 50 #include <errno.h> 51 #include <signal.h> 52 #include <netdb.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <unistd.h> 56 57 #include "talk.h" 58 #include "talk_ctl.h" 59 60 #define A_LONG_TIME 10000000 61 62 volatile sig_atomic_t gotwinch = 0; 63 64 /* 65 * The routine to do the actual talking 66 */ 67 void 68 talk(void) 69 { 70 struct hostent *hp, *hp2; 71 int nb; 72 fd_set read_set, read_template; 73 char buf[BUFSIZ], **addr, *his_machine_name; 74 struct timeval wait; 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(buf, sizeof(buf), "Connection established with %s@%s.", 93 msg.r_name, his_machine_name); 94 free(his_machine_name); 95 message(buf); 96 write(STDOUT_FILENO, "\007\007\007", 3); 97 98 current_line = 0; 99 100 /* 101 * Wait on both the other process (sockt_mask) and 102 * standard input ( STDIN_MASK ) 103 */ 104 FD_ZERO(&read_template); 105 FD_SET(sockt, &read_template); 106 FD_SET(fileno(stdin), &read_template); 107 for (;;) { 108 read_set = read_template; 109 wait.tv_sec = A_LONG_TIME; 110 wait.tv_usec = 0; 111 nb = select(32, &read_set, 0, 0, &wait); 112 if (gotwinch) { 113 resize_display(); 114 gotwinch = 0; 115 } 116 if (nb <= 0) { 117 if (errno == EINTR) { 118 read_set = read_template; 119 continue; 120 } 121 /* panic, we don't know what happened */ 122 p_error("Unexpected error from select"); 123 quit(); 124 } 125 if (FD_ISSET(sockt, &read_set)) { 126 /* There is data on sockt */ 127 nb = read(sockt, buf, sizeof buf); 128 if (nb <= 0) { 129 message("Connection closed. Exiting"); 130 quit(); 131 } 132 display(&his_win, buf, nb); 133 } 134 if (FD_ISSET(fileno(stdin), &read_set)) { 135 /* 136 * We can't make the tty non_blocking, because 137 * curses's output routines would screw up 138 */ 139 int i; 140 ioctl(0, FIONREAD, (void *) &nb); 141 if (nb > (ssize_t)(sizeof buf)) 142 nb = sizeof buf; 143 nb = read(STDIN_FILENO, buf, nb); 144 display(&my_win, buf, nb); 145 /* might lose data here because sockt is non-blocking */ 146 for (i = 0; i < nb; ++i) 147 if (buf[i] == '\r') 148 buf[i] = '\n'; 149 write(sockt, buf, nb); 150 } 151 } 152 } 153 154 /* 155 * p_error prints the system error message on the standard location 156 * on the screen and then exits. (i.e. a curses version of perror) 157 */ 158 void 159 p_error(const char *string) 160 { 161 wmove(my_win.x_win, current_line, 0); 162 wprintw(my_win.x_win, "[%s : %s (%d)]\n", 163 string, strerror(errno), errno); 164 wrefresh(my_win.x_win); 165 move(LINES-1, 0); 166 refresh(); 167 quit(); 168 } 169 170 /* 171 * Display string in the standard location 172 */ 173 void 174 message(const char *string) 175 { 176 wmove(my_win.x_win, current_line, 0); 177 wprintw(my_win.x_win, "[%s]\n", string); 178 if (current_line < my_win.x_nlines - 1) 179 current_line++; 180 wrefresh(my_win.x_win); 181 } 182