talkd.tproj/announce.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.0 (the 'License').  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License."
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Copyright (c) 1983, 1993
  26  *      The Regents of the University of California.  All rights reserved.
  27  *
  28  * Redistribution and use in source and binary forms, with or without
  29  * modification, are permitted provided that the following conditions
  30  * are met:
  31  * 1. Redistributions of source code must retain the above copyright
  32  *    notice, this list of conditions and the following disclaimer.
  33  * 2. Redistributions in binary form must reproduce the above copyright
  34  *    notice, this list of conditions and the following disclaimer in the
  35  *    documentation and/or other materials provided with the distribution.
  36  * 3. All advertising materials mentioning features or use of this software
  37  *    must display the following acknowledgement:
  38  *      This product includes software developed by the University of
  39  *      California, Berkeley and its contributors.
  40  * 4. Neither the name of the University nor the names of its contributors
  41  *    may be used to endorse or promote products derived from this software
  42  *    without specific prior written permission.
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  54  * SUCH DAMAGE.
  55  */
  56
  57 #ifndef lint
  58 static char sccsid[] = "@(#)announce.c  8.3 (Berkeley) 1/7/94";
  59 #endif /* not lint */
  60
  61 #include <sys/types.h>
  62 #include <sys/uio.h>
  63 #include <sys/stat.h>
  64 #include <sys/time.h>
  65 #include <sys/wait.h>
  66 #include <sys/socket.h>
  67 #include <protocols/talkd.h>
  68 #include <sgtty.h>
  69 #include <errno.h>
  70 #include <syslog.h>
  71 #include <unistd.h>
  72 #include <stdio.h>
  73 #include <stdlib.h>
  74 #include <string.h>
  75 #include <paths.h>
  76 #include <vis.h>
  77 #include "talkd.h"
  78
  79 extern char hostname[];
  80
  81 int print_mesg __P((char *tty, CTL_MSG *request, char *remote_machine));
  82
  83 /*
  84  * Announce an invitation to talk.
  85  */
  86
  87 /*
  88  * See if the user is accepting messages. If so, announce that
  89  * a talk is requested.
  90  */
  91 int
  92 announce(request, remote_machine)
  93         CTL_MSG *request;
  94         char *remote_machine;
  95 {
  96         char full_tty[32];
  97         struct stat stbuf;
  98
  99         (void)snprintf(full_tty, sizeof(full_tty),
 100             "%s%s", _PATH_DEV, request->r_tty);
 101         if (stat(full_tty, &stbuf) < 0 || (stbuf.st_mode&020) == 0)
 102                 return (PERMISSION_DENIED);
 103         return (print_mesg(request->r_tty, request, remote_machine));
 104 }
 105
 106 #define max(a,b) ( (a) > (b) ? (a) : (b) )
 107 #define N_LINES 5
 108 #define N_CHARS 256
 109
 110 /*
 111  * Build a block of characters containing the message.
 112  * It is sent blank filled and in a single block to
 113  * try to keep the message in one piece if the recipient
 114  * in in vi at the time
 115  */
 116 int
 117 print_mesg(tty, request, remote_machine)
 118         char *tty;
 119         CTL_MSG *request;
 120         char *remote_machine;
 121 {
 122         struct timeval clock;
 123         struct timezone zone;
 124         struct tm *localtime();
 125         struct tm *localclock;
 126         struct iovec iovec;
 127         char line_buf[N_LINES][N_CHARS];
 128         int sizes[N_LINES];
 129         char big_buf[N_LINES*N_CHARS];
 130         char *bptr, *lptr, *vis_user;
 131         int i, j, max_size;
 132
 133         i = 0;
 134         max_size = 0;
 135         gettimeofday(&clock, &zone);
 136         localclock = localtime( &clock.tv_sec );
 137         (void)snprintf(line_buf[i], N_CHARS, " ");
 138         sizes[i] = strlen(line_buf[i]);
 139         max_size = max(max_size, sizes[i]);
 140         i++;
 141         (void)snprintf(line_buf[i], N_CHARS,
 142                 "Message from Talk_Daemon@%s at %d:%02d ...",
 143                 hostname, localclock->tm_hour , localclock->tm_min );
 144         sizes[i] = strlen(line_buf[i]);
 145         max_size = max(max_size, sizes[i]);
 146         i++;
 147
 148         vis_user = malloc(strlen(request->l_name) * 4 + 1);
 149         strvis(vis_user, request->l_name, VIS_CSTYLE);
 150         (void)snprintf(line_buf[i], N_CHARS,
 151         "talk: connection requested by %s@%s", vis_user, remote_machine);
 152         sizes[i] = strlen(line_buf[i]);
 153         max_size = max(max_size, sizes[i]);
 154         i++;
 155         (void)snprintf(line_buf[i], N_CHARS, "talk: respond with:  talk %s@%s",
 156         vis_user, remote_machine);
 157         sizes[i] = strlen(line_buf[i]);
 158         max_size = max(max_size, sizes[i]);
 159         i++;
 160         (void)snprintf(line_buf[i], N_CHARS, " ");
 161         sizes[i] = strlen(line_buf[i]);
 162         max_size = max(max_size, sizes[i]);
 163         i++;
 164         bptr = big_buf;
 165         *bptr++ = '\a'; /* send something to wake them up */
 166         *bptr++ = '\r'; /* add a \r in case of raw mode */
 167         *bptr++ = '\n';
 168         for (i = 0; i < N_LINES; i++) {
 169                 /* copy the line into the big buffer */
 170                 lptr = line_buf[i];
 171                 while (*lptr != '\0')
 172                         *(bptr++) = *(lptr++);
 173                 /* pad out the rest of the lines with blanks */
 174                 for (j = sizes[i]; j < max_size + 2; j++)
 175                         *(bptr++) = ' ';
 176                 *(bptr++) = '\r';       /* add a \r in case of raw mode */
 177                 *(bptr++) = '\n';
 178         }
 179         *bptr = '\0';
 180         iovec.iov_base = big_buf;
 181         iovec.iov_len = bptr - big_buf;
 182         /*
 183          * we choose a timeout of RING_WAIT-5 seconds so that we don't
 184          * stack up processes trying to write messages to a tty
 185          * that is permanently blocked.
 186          */
 187         if (ttymsg(&iovec, 1, tty, RING_WAIT - 5) != NULL)
 188                 return (FAILED);
 189
 190         return (SUCCESS);
 191 }