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 * 4. 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 30 #include <sys/cdefs.h> 31 32 __FBSDID("$FreeBSD$"); 33 34 #ifndef lint 35 static const char sccsid[] = "@(#)io.c 8.1 (Berkeley) 6/6/93"; 36 #endif 37 38 /* 39 * This file contains the I/O handling and the exchange of 40 * edit characters. This connection itself is established in 41 * ctl.c 42 */ 43 44 #include <sys/filio.h> 45 46 #include <errno.h> 47 #include <signal.h> 48 #include <netdb.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <unistd.h> 52 53 #include "talk.h" 54 #include "talk_ctl.h" 55 56 #define A_LONG_TIME 10000000 57 58 volatile sig_atomic_t gotwinch = 0; 59 60 /* 61 * The routine to do the actual talking 62 */ 63 void 64 talk(void) 65 { 66 struct hostent *hp, *hp2; 67 int nb; 68 fd_set read_set, read_template; 69 char buf[BUFSIZ], **addr, *his_machine_name; 70 struct timeval wait; 71 72 his_machine_name = NULL; 73 hp = gethostbyaddr((const char *)&his_machine_addr.s_addr, 74 sizeof(his_machine_addr.s_addr), AF_INET); 75 if (hp != NULL) { 76 hp2 = gethostbyname(hp->h_name); 77 if (hp2 != NULL && hp2->h_addrtype == AF_INET && 78 hp2->h_length == sizeof(his_machine_addr)) 79 for (addr = hp2->h_addr_list; *addr != NULL; addr++) 80 if (memcmp(*addr, &his_machine_addr, 81 sizeof(his_machine_addr)) == 0) { 82 his_machine_name = strdup(hp->h_name); 83 break; 84 } 85 } 86 if (his_machine_name == NULL) 87 his_machine_name = strdup(inet_ntoa(his_machine_addr)); 88 snprintf(buf, sizeof(buf), "Connection established with %s@%s.", 89 msg.r_name, his_machine_name); 90 free(his_machine_name); 91 message(buf); 92 write(STDOUT_FILENO, "\007\007\007", 3); 93 94 current_line = 0; 95 96 /* 97 * Wait on both the other process (sockt_mask) and 98 * standard input ( STDIN_MASK ) 99 */ 100 FD_ZERO(&read_template); 101 FD_SET(sockt, &read_template); 102 FD_SET(fileno(stdin), &read_template); 103 for (;;) { 104 read_set = read_template; 105 wait.tv_sec = A_LONG_TIME; 106 wait.tv_usec = 0; 107 nb = select(32, &read_set, 0, 0, &wait); 108 if (gotwinch) { 109 resize_display(); 110 gotwinch = 0; 111 } 112 if (nb <= 0) { 113 if (errno == EINTR) { 114 read_set = read_template; 115 continue; 116 } 117 /* panic, we don't know what happened */ 118 p_error("Unexpected error from select"); 119 quit(); 120 } 121 if (FD_ISSET(sockt, &read_set)) { 122 /* There is data on sockt */ 123 nb = read(sockt, buf, sizeof buf); 124 if (nb <= 0) { 125 message("Connection closed. Exiting"); 126 quit(); 127 } 128 display(&his_win, buf, nb); 129 } 130 if (FD_ISSET(fileno(stdin), &read_set)) { 131 /* 132 * We can't make the tty non_blocking, because 133 * curses's output routines would screw up 134 */ 135 int i; 136 ioctl(0, FIONREAD, (void *) &nb); 137 if (nb > (ssize_t)(sizeof buf)) 138 nb = sizeof buf; 139 nb = read(STDIN_FILENO, buf, nb); 140 display(&my_win, buf, nb); 141 /* might lose data here because sockt is non-blocking */ 142 for (i = 0; i < nb; ++i) 143 if (buf[i] == '\r') 144 buf[i] = '\n'; 145 write(sockt, buf, nb); 146 } 147 } 148 } 149 150 /* 151 * p_error prints the system error message on the standard location 152 * on the screen and then exits. (i.e. a curses version of perror) 153 */ 154 void 155 p_error(const char *string) 156 { 157 wmove(my_win.x_win, current_line, 0); 158 wprintw(my_win.x_win, "[%s : %s (%d)]\n", 159 string, strerror(errno), errno); 160 wrefresh(my_win.x_win); 161 move(LINES-1, 0); 162 refresh(); 163 quit(); 164 } 165 166 /* 167 * Display string in the standard location 168 */ 169 void 170 message(const char *string) 171 { 172 wmove(my_win.x_win, current_line, 0); 173 wprintw(my_win.x_win, "[%s]\n", string); 174 if (current_line < my_win.x_nlines - 1) 175 current_line++; 176 wrefresh(my_win.x_win); 177 } 178