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 <poll.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <unistd.h> 54 #define _XOPEN_SOURCE_EXTENDED 55 #include <curses.h> 56 57 #include "talk.h" 58 #include "talk_ctl.h" 59 60 extern void display(xwin_t *, wchar_t *); 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 struct pollfd fds[2]; 72 int nb; 73 wchar_t buf[BUFSIZ]; 74 char **addr, *his_machine_name; 75 FILE *sockfp; 76 77 his_machine_name = NULL; 78 hp = gethostbyaddr((const char *)&his_machine_addr.s_addr, 79 sizeof(his_machine_addr.s_addr), AF_INET); 80 if (hp != NULL) { 81 hp2 = gethostbyname(hp->h_name); 82 if (hp2 != NULL && hp2->h_addrtype == AF_INET && 83 hp2->h_length == sizeof(his_machine_addr)) 84 for (addr = hp2->h_addr_list; *addr != NULL; addr++) 85 if (memcmp(*addr, &his_machine_addr, 86 sizeof(his_machine_addr)) == 0) { 87 his_machine_name = strdup(hp->h_name); 88 break; 89 } 90 } 91 if (his_machine_name == NULL) 92 his_machine_name = strdup(inet_ntoa(his_machine_addr)); 93 snprintf((char *)buf, sizeof(buf), "Connection established with %s@%s.", 94 msg.r_name, his_machine_name); 95 free(his_machine_name); 96 message((char *)buf); 97 write(STDOUT_FILENO, "\007\007\007", 3); 98 99 current_line = 0; 100 101 if ((sockfp = fdopen(sockt, "w+")) == NULL) 102 p_error("fdopen"); 103 104 setvbuf(sockfp, NULL, _IONBF, 0); 105 setvbuf(stdin, NULL, _IONBF, 0); 106 107 /* 108 * Wait on both the other process (sockt) and standard input. 109 */ 110 for (;;) { 111 fds[0].fd = fileno(stdin); 112 fds[0].events = POLLIN; 113 fds[1].fd = sockt; 114 fds[1].events = POLLIN; 115 nb = poll(fds, 2, INFTIM); 116 if (gotwinch) { 117 resize_display(); 118 gotwinch = 0; 119 } 120 if (nb <= 0) { 121 if (errno == EINTR) 122 continue; 123 /* Panic, we don't know what happened. */ 124 p_error("Unexpected error from poll"); 125 quit(); 126 } 127 if (fds[1].revents & POLLIN) { 128 wint_t w; 129 130 /* There is data on sockt. */ 131 w = fgetwc(sockfp); 132 if (w == WEOF) { 133 message("Connection closed. Exiting"); 134 quit(); 135 } 136 display(&his_win, &w); 137 } 138 if (fds[0].revents & POLLIN) { 139 wint_t w; 140 141 if ((w = getwchar()) != WEOF) { 142 display(&my_win, &w); 143 (void )fputwc(w, sockfp); 144 (void )fflush(sockfp); 145 } 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