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 <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <unistd.h> 53 #define _XOPEN_SOURCE_EXTENDED 54 #include <curses.h> 55 56 #include "talk.h" 57 #include "talk_ctl.h" 58 59 extern void display(xwin_t *, wchar_t *); 60 61 volatile sig_atomic_t gotwinch = 0; 62 63 /* 64 * The routine to do the actual talking 65 */ 66 void 67 talk(void) 68 { 69 struct hostent *hp, *hp2; 70 int nb; 71 fd_set read_set; 72 wchar_t buf[BUFSIZ]; 73 char **addr, *his_machine_name; 74 FILE *sockfp; 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((char *)buf, sizeof(buf), "Connection established with %s@%s.", 93 msg.r_name, his_machine_name); 94 free(his_machine_name); 95 message((char *)buf); 96 write(STDOUT_FILENO, "\007\007\007", 3); 97 98 current_line = 0; 99 100 if ((sockfp = fdopen(sockt, "w+")) == NULL) 101 p_error("fdopen"); 102 103 setvbuf(sockfp, NULL, _IONBF, 0); 104 setvbuf(stdin, NULL, _IONBF, 0); 105 106 /* 107 * Wait on both the other process (sockt) and standard input. 108 */ 109 for (;;) { 110 FD_ZERO(&read_set); 111 FD_SET(sockt, &read_set); 112 FD_SET(fileno(stdin), &read_set); 113 nb = select(32, &read_set, 0, 0, NULL); 114 if (gotwinch) { 115 resize_display(); 116 gotwinch = 0; 117 } 118 if (nb <= 0) { 119 if (errno == EINTR) 120 continue; 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 wint_t w; 127 128 /* There is data on sockt. */ 129 w = fgetwc(sockfp); 130 if (w == WEOF) { 131 message("Connection closed. Exiting"); 132 quit(); 133 } 134 display(&his_win, &w); 135 } 136 if (FD_ISSET(fileno(stdin), &read_set)) { 137 wint_t w; 138 139 if ((w = getwchar()) != WEOF) { 140 display(&my_win, &w); 141 (void )fputwc(w, sockfp); 142 (void )fflush(sockfp); 143 } 144 } 145 } 146 } 147 148 /* 149 * p_error prints the system error message on the standard location 150 * on the screen and then exits. (i.e. a curses version of perror) 151 */ 152 void 153 p_error(const char *string) 154 { 155 wmove(my_win.x_win, current_line, 0); 156 wprintw(my_win.x_win, "[%s : %s (%d)]\n", 157 string, strerror(errno), errno); 158 wrefresh(my_win.x_win); 159 move(LINES-1, 0); 160 refresh(); 161 quit(); 162 } 163 164 /* 165 * Display string in the standard location 166 */ 167 void 168 message(const char *string) 169 { 170 wmove(my_win.x_win, current_line, 0); 171 wprintw(my_win.x_win, "[%s]\n", string); 172 if (current_line < my_win.x_nlines - 1) 173 current_line++; 174 wrefresh(my_win.x_win); 175 } 176