1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 33 #ifndef lint 34 static const char sccsid[] = "@(#)io.c 8.1 (Berkeley) 6/6/93"; 35 #endif 36 37 /* 38 * This file contains the I/O handling and the exchange of 39 * edit characters. This connection itself is established in 40 * ctl.c 41 */ 42 43 #include <sys/filio.h> 44 45 #include <errno.h> 46 #include <signal.h> 47 #include <netdb.h> 48 #include <poll.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 struct pollfd fds[2]; 71 int nb; 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 fds[0].fd = fileno(stdin); 111 fds[0].events = POLLIN; 112 fds[1].fd = sockt; 113 fds[1].events = POLLIN; 114 nb = poll(fds, 2, INFTIM); 115 if (gotwinch) { 116 resize_display(); 117 gotwinch = 0; 118 } 119 if (nb <= 0) { 120 if (errno == EINTR) 121 continue; 122 /* Panic, we don't know what happened. */ 123 p_error("Unexpected error from poll"); 124 quit(); 125 } 126 if (fds[1].revents & POLLIN) { 127 wint_t w; 128 129 /* There is data on sockt. */ 130 w = fgetwc(sockfp); 131 if (w == WEOF) { 132 message("Connection closed. Exiting"); 133 quit(); 134 } 135 display(&his_win, &w); 136 } 137 if (fds[0].revents & POLLIN) { 138 wint_t w; 139 140 if ((w = getwchar()) != WEOF) { 141 display(&my_win, &w); 142 (void )fputwc(w, sockfp); 143 (void )fflush(sockfp); 144 } 145 } 146 } 147 } 148 149 /* 150 * p_error prints the system error message on the standard location 151 * on the screen and then exits. (i.e. a curses version of perror) 152 */ 153 void 154 p_error(const char *string) 155 { 156 wmove(my_win.x_win, current_line, 0); 157 wprintw(my_win.x_win, "[%s : %s (%d)]\n", 158 string, strerror(errno), errno); 159 wrefresh(my_win.x_win); 160 move(LINES-1, 0); 161 refresh(); 162 quit(); 163 } 164 165 /* 166 * Display string in the standard location 167 */ 168 void 169 message(const char *string) 170 { 171 wmove(my_win.x_win, current_line, 0); 172 wprintw(my_win.x_win, "[%s]\n", string); 173 if (current_line < my_win.x_nlines - 1) 174 current_line++; 175 wrefresh(my_win.x_win); 176 } 177