usr.bin/talk/io.c

   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 }