remote_cmds/talk.tproj/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  * 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 #include <sys/cdefs.h>
  35
  36 #ifndef __APPLE__
  37 __FBSDID("$FreeBSD: src/usr.bin/talk/io.c,v 1.16 2004/05/10 15:52:16 cognet Exp $");
  38
  39 #ifndef lint
  40 static const char sccsid[] = "@(#)io.c  8.1 (Berkeley) 6/6/93";
  41 #endif
  42 #endif /* __APPLE__ */
  43
  44 /*
  45  * This file contains the I/O handling and the exchange of
  46  * edit characters. This connection itself is established in
  47  * ctl.c
  48  */
  49
  50 #include <sys/filio.h>
  51 #ifdef __APPLE__
  52 #include <sys/ioctl.h>
  53 #endif
  54
  55 #include <errno.h>
  56 #include <signal.h>
  57 #include <netdb.h>
  58 #include <stdlib.h>
  59 #include <string.h>
  60 #include <unistd.h>
  61
  62 #include "talk.h"
  63 #include "talk_ctl.h"
  64
  65 #define A_LONG_TIME 10000000
  66
  67 volatile sig_atomic_t gotwinch = 0;
  68
  69 /*
  70  * The routine to do the actual talking
  71  */
  72 void
  73 talk()
  74 {
  75         struct hostent *hp, *hp2;
  76         int nb;
  77         fd_set read_set, read_template;
  78         char buf[BUFSIZ], **addr, *his_machine_name;
  79         struct timeval wait;
  80
  81         his_machine_name = NULL;
  82         hp = gethostbyaddr((const char *)&his_machine_addr.s_addr,
  83             sizeof(his_machine_addr.s_addr), AF_INET);
  84         if (hp != NULL) {
  85                 hp2 = gethostbyname(hp->h_name);
  86                 if (hp2 != NULL && hp2->h_addrtype == AF_INET &&
  87                     hp2->h_length == sizeof(his_machine_addr))
  88                         for (addr = hp2->h_addr_list; *addr != NULL; addr++)
  89                                 if (memcmp(*addr, &his_machine_addr,
  90                                     sizeof(his_machine_addr)) == 0) {
  91                                         his_machine_name = strdup(hp->h_name);
  92                                         break;
  93                                 }
  94         }
  95         if (his_machine_name == NULL)
  96                 his_machine_name = strdup(inet_ntoa(his_machine_addr));
  97         snprintf(buf, sizeof(buf), "Connection established with %s@%s.",
  98             msg.r_name, his_machine_name);
  99         free(his_machine_name);
 100         message(buf);
 101         write(STDOUT_FILENO, "\007\007\007", 3);
 102
 103         current_line = 0;
 104
 105         /*
 106          * Wait on both the other process (sockt_mask) and
 107          * standard input ( STDIN_MASK )
 108          */
 109         FD_ZERO(&read_template);
 110         FD_SET(sockt, &read_template);
 111         FD_SET(fileno(stdin), &read_template);
 112         for (;;) {
 113                 read_set = read_template;
 114                 wait.tv_sec = A_LONG_TIME;
 115                 wait.tv_usec = 0;
 116                 nb = select(sockt + 1, &read_set, 0, 0, &wait);
 117                 if (gotwinch) {
 118                         resize_display();
 119                         gotwinch = 0;
 120                 }
 121                 if (nb <= 0) {
 122                         if (errno == EINTR) {
 123                                 read_set = read_template;
 124                                 continue;
 125                         }
 126                         /* panic, we don't know what happened */
 127                         p_error("Unexpected error from select");
 128                         quit();
 129                 }
 130                 if (FD_ISSET(sockt, &read_set)) {
 131                         /* There is data on sockt */
 132                         nb = read(sockt, buf, sizeof buf);
 133                         if (nb <= 0) {
 134                                 message("Connection closed. Exiting");
 135                                 quit();
 136                         }
 137                         display(&his_win, buf, nb);
 138                 }
 139                 if (FD_ISSET(fileno(stdin), &read_set)) {
 140                         /*
 141                          * We can't make the tty non_blocking, because
 142                          * curses's output routines would screw up
 143                          */
 144                         int i;
 145                         ioctl(0, FIONREAD, (void *) &nb);
 146                         if (nb > sizeof buf)
 147                                 nb = sizeof buf;
 148                         nb = read(STDIN_FILENO, buf, nb);
 149                         display(&my_win, buf, nb);
 150                         /* might lose data here because sockt is non-blocking */
 151                         for (i = 0; i < nb; ++i)
 152                                 if (buf[i] == '\r')
 153                                         buf[i] = '\n';
 154                         write(sockt, buf, nb);
 155                 }
 156         }
 157 }
 158
 159 /*
 160  * p_error prints the system error message on the standard location
 161  * on the screen and then exits. (i.e. a curses version of perror)
 162  */
 163 void
 164 p_error(string)
 165         const char *string;
 166 {
 167         wmove(my_win.x_win, current_line, 0);
 168         wprintw(my_win.x_win, "[%s : %s (%d)]\n",
 169             string, strerror(errno), errno);
 170         wrefresh(my_win.x_win);
 171         move(LINES-1, 0);
 172         refresh();
 173         quit();
 174 }
 175
 176 /*
 177  * Display string in the standard location
 178  */
 179 void
 180 message(string)
 181         const char *string;
 182 {
 183         wmove(my_win.x_win, current_line, 0);
 184         wprintw(my_win.x_win, "[%s]\n", string);
 185         if (current_line < my_win.x_nlines - 1)
 186                 current_line++;
 187         wrefresh(my_win.x_win);
 188 }