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