167 lines
5.2 KiB
C
167 lines
5.2 KiB
C
/* $NetBSD: announce.c,v 1.25 2009/03/16 01:13:38 lukem Exp $ */
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/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)announce.c 8.3 (Berkeley) 4/28/95";
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#else
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__RCSID("$NetBSD: announce.c,v 1.25 2009/03/16 01:13:38 lukem Exp $");
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#endif
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <sys/socket.h>
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#include <protocols/talkd.h>
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#include <errno.h>
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#include <syslog.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <vis.h>
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#include <paths.h>
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#include <util.h>
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#include "extern.h"
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extern char hostname[];
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/*
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* Announce an invitation to talk.
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*/
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/*
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* See if the user is accepting messages. If so, announce that
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* a talk is requested.
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*/
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int
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announce(CTL_MSG *request, const char *remote_machine)
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{
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char full_tty[32];
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struct stat stbuf;
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(void)snprintf(full_tty, sizeof(full_tty),
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"%s%s", _PATH_DEV, request->r_tty);
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if (stat(full_tty, &stbuf) < 0 || (stbuf.st_mode&S_IWGRP) == 0)
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return (PERMISSION_DENIED);
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return (print_mesg(request->r_tty, request, remote_machine));
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}
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#define max(a, b) ((a) > (b) ? (a) : (b))
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#define N_LINES 5
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#define N_CHARS 256
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/*
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* Build a block of characters containing the message.
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* It is sent blank filled and in a single block to
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* try to keep the message in one piece if the recipient
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* is in vi at the time.
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*/
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int
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print_mesg(const char *tty, CTL_MSG *request, const char *remote_machine)
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{
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struct timeval clocktv;
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time_t clocktime;
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struct tm *localclock;
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struct iovec iovec;
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char line_buf[N_LINES][N_CHARS];
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int sizes[N_LINES];
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char big_buf[(N_LINES + 1) * N_CHARS];
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char *bptr, *lptr, vis_user[sizeof(request->l_name) * 4];
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int i, j, max_size;
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i = 0;
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max_size = 0;
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(void)gettimeofday(&clocktv, NULL);
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clocktime = clocktv.tv_sec;
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localclock = localtime(&clocktime);
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(void)snprintf(line_buf[i], N_CHARS, " ");
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sizes[i] = strlen(line_buf[i]);
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max_size = max(max_size, sizes[i]);
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i++;
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(void)snprintf(line_buf[i], N_CHARS,
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"Message from Talk_Daemon@%s at %d:%02d ...",
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hostname, localclock->tm_hour, localclock->tm_min);
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sizes[i] = strlen(line_buf[i]);
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max_size = max(max_size, sizes[i]);
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i++;
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if (strlen(request->l_name) + 1 > sizeof(vis_user) / 4)
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return (FAILED);
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strvis(vis_user, request->l_name, VIS_CSTYLE);
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(void)snprintf(line_buf[i], N_CHARS,
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"talk: connection requested by %s@%s.", vis_user, remote_machine);
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sizes[i] = strlen(line_buf[i]);
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max_size = max(max_size, sizes[i]);
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i++;
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(void)snprintf(line_buf[i], N_CHARS,
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"talk: respond with: talk %s@%s", vis_user, remote_machine);
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sizes[i] = strlen(line_buf[i]);
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max_size = max(max_size, sizes[i]);
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i++;
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(void)snprintf(line_buf[i], N_CHARS, " ");
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sizes[i] = strlen(line_buf[i]);
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max_size = max(max_size, sizes[i]);
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i++;
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bptr = big_buf;
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*bptr++ = '\a'; /* send something to wake them up */
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*bptr++ = '\r'; /* add a \r in case of raw mode */
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*bptr++ = '\n';
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for (i = 0; i < N_LINES; i++) {
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/* copy the line into the big buffer */
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lptr = line_buf[i];
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while (*lptr != '\0' && lptr < (line_buf[i] + N_CHARS))
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*(bptr++) = *(lptr++);
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/* pad out the rest of the lines with blanks */
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for (j = sizes[i]; j < max_size + 2; j++)
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*(bptr++) = ' ';
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*(bptr++) = '\r'; /* add a \r in case of raw mode */
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*(bptr++) = '\n';
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}
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*bptr = '\0';
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iovec.iov_base = big_buf;
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iovec.iov_len = bptr - big_buf;
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/*
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* we choose a timeout of RING_WAIT-5 seconds so that we don't
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* stack up processes trying to write messages to a tty
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* that is permanently blocked.
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*/
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if (ttymsg(&iovec, 1, tty, RING_WAIT - 5) != NULL)
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return (FAILED);
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return (SUCCESS);
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}
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