talkd.tproj/announce.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1983, 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58 #ifndef lint
  59 static char sccsid[] = "@(#)announce.c  8.3 (Berkeley) 1/7/94";
  60 #endif /* not lint */
  61
  62 #include <sys/types.h>
  63 #include <sys/uio.h>
  64 #include <sys/stat.h>
  65 #include <sys/time.h>
  66 #include <sys/wait.h>
  67 #include <sys/socket.h>
  68 #include <protocols/talkd.h>
  69 #include <sgtty.h>
  70 #include <errno.h>
  71 #include <syslog.h>
  72 #include <unistd.h>
  73 #include <stdio.h>
  74 #include <stdlib.h>
  75 #include <string.h>
  76 #include <paths.h>
  77 #include <vis.h>
  78 #include "talkd.h"
  79
  80 extern char hostname[];
  81
  82 int print_mesg __P((char *tty, CTL_MSG *request, char *remote_machine));
  83
  84 /*
  85  * Announce an invitation to talk.
  86  */
  87
  88 /*
  89  * See if the user is accepting messages. If so, announce that
  90  * a talk is requested.
  91  */
  92 int
  93 announce(request, remote_machine)
  94         CTL_MSG *request;
  95         char *remote_machine;
  96 {
  97         char full_tty[32];
  98         struct stat stbuf;
  99
 100         (void)snprintf(full_tty, sizeof(full_tty),
 101             "%s%s", _PATH_DEV, request->r_tty);
 102         if (stat(full_tty, &stbuf) < 0 || (stbuf.st_mode&020) == 0)
 103                 return (PERMISSION_DENIED);
 104         return (print_mesg(request->r_tty, request, remote_machine));
 105 }
 106
 107 #define max(a,b) ( (a) > (b) ? (a) : (b) )
 108 #define N_LINES 5
 109 #define N_CHARS 256
 110
 111 /*
 112  * Build a block of characters containing the message.
 113  * It is sent blank filled and in a single block to
 114  * try to keep the message in one piece if the recipient
 115  * in in vi at the time
 116  */
 117 int
 118 print_mesg(tty, request, remote_machine)
 119         char *tty;
 120         CTL_MSG *request;
 121         char *remote_machine;
 122 {
 123         struct timeval clock;
 124         struct timezone zone;
 125         struct tm *localtime();
 126         struct tm *localclock;
 127         struct iovec iovec;
 128         char line_buf[N_LINES][N_CHARS];
 129         int sizes[N_LINES];
 130         char big_buf[N_LINES*N_CHARS];
 131         char *bptr, *lptr, *vis_user;
 132         int i, j, max_size;
 133
 134         i = 0;
 135         max_size = 0;
 136         gettimeofday(&clock, &zone);
 137         localclock = localtime( &clock.tv_sec );
 138         (void)snprintf(line_buf[i], N_CHARS, " ");
 139         sizes[i] = strlen(line_buf[i]);
 140         max_size = max(max_size, sizes[i]);
 141         i++;
 142         (void)snprintf(line_buf[i], N_CHARS,
 143                 "Message from Talk_Daemon@%s at %d:%02d ...",
 144                 hostname, localclock->tm_hour , localclock->tm_min );
 145         sizes[i] = strlen(line_buf[i]);
 146         max_size = max(max_size, sizes[i]);
 147         i++;
 148
 149         vis_user = malloc(strlen(request->l_name) * 4 + 1);
 150         strvis(vis_user, request->l_name, VIS_CSTYLE);
 151         (void)snprintf(line_buf[i], N_CHARS,
 152         "talk: connection requested by %s@%s", vis_user, remote_machine);
 153         sizes[i] = strlen(line_buf[i]);
 154         max_size = max(max_size, sizes[i]);
 155         i++;
 156         (void)snprintf(line_buf[i], N_CHARS, "talk: respond with:  talk %s@%s",
 157         vis_user, remote_machine);
 158         sizes[i] = strlen(line_buf[i]);
 159         max_size = max(max_size, sizes[i]);
 160         i++;
 161         (void)snprintf(line_buf[i], N_CHARS, " ");
 162         sizes[i] = strlen(line_buf[i]);
 163         max_size = max(max_size, sizes[i]);
 164         i++;
 165         bptr = big_buf;
 166         *bptr++ = '\a'; /* send something to wake them up */
 167         *bptr++ = '\r'; /* add a \r in case of raw mode */
 168         *bptr++ = '\n';
 169         for (i = 0; i < N_LINES; i++) {
 170                 /* copy the line into the big buffer */
 171                 lptr = line_buf[i];
 172                 while (*lptr != '\0')
 173                         *(bptr++) = *(lptr++);
 174                 /* pad out the rest of the lines with blanks */
 175                 for (j = sizes[i]; j < max_size + 2; j++)
 176                         *(bptr++) = ' ';
 177                 *(bptr++) = '\r';       /* add a \r in case of raw mode */
 178                 *(bptr++) = '\n';
 179         }
 180         *bptr = '\0';
 181         iovec.iov_base = big_buf;
 182         iovec.iov_len = bptr - big_buf;
 183         /*
 184          * we choose a timeout of RING_WAIT-5 seconds so that we don't
 185          * stack up processes trying to write messages to a tty
 186          * that is permanently blocked.
 187          */
 188         if (ttymsg(&iovec, 1, tty, RING_WAIT - 5) != NULL)
 189                 return (FAILED);
 190
 191         return (SUCCESS);
 192 }