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