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/* $OpenBSD: announce.c,v 1.6 1996/07/18 00:18:53 deraadt Exp $ */
/*
* Copyright (c) 1983 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#ifndef lint
/*static char sccsid[] = "from: @(#)announce.c 5.9 (Berkeley) 2/26/91";*/
static char rcsid[] = "$Id: announce.c,v 1.6 1996/07/18 00:18:53 deraadt Exp $";
#endif /* not lint */
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <protocols/talkd.h>
#include <sgtty.h>
#include <errno.h>
#include <syslog.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <vis.h>
#include <paths.h>
#include "talkd.h"
static void print_mesg __P((FILE *,CTL_MSG *,char *));
/*
* Announce an invitation to talk.
*
* Because the tty driver insists on attaching a terminal-less
* process to any terminal that it writes on, we must fork a child
* to protect ourselves
*/
int
announce(request, remote_machine)
CTL_MSG *request;
char *remote_machine;
{
int pid, val, status;
if (pid = fork()) {
/* we are the parent, so wait for the child */
if (pid == -1) /* the fork failed */
return (FAILED);
do {
val = wait(&status);
if (val == -1) {
if (errno == EINTR)
continue;
/* shouldn't happen */
syslog(LOG_WARNING, "announce: wait: %m");
return (FAILED);
}
} while (val != pid);
if (status&0377 > 0) /* we were killed by some signal */
return (FAILED);
/* Get the second byte, this is the exit/return code */
return ((status >> 8) & 0377);
}
/* we are the child, go and do it */
_exit(announce_proc(request, remote_machine));
}
/*
* See if the user is accepting messages. If so, announce that
* a talk is requested.
*/
int
announce_proc(request, remote_machine)
CTL_MSG *request;
char *remote_machine;
{
int pid, status;
char full_tty[MAXPATHLEN];
FILE *tf;
struct stat stbuf;
(void)snprintf(full_tty, sizeof full_tty, "%s/%s", _PATH_DEV,
request->r_tty);
if (access(full_tty, 0) != 0)
return (FAILED);
if ((tf = fopen(full_tty, "w")) == NULL)
return (PERMISSION_DENIED);
/*
* On first tty open, the server will have
* it's pgrp set, so disconnect us from the
* tty before we catch a signal.
*/
ioctl(fileno(tf), TIOCNOTTY, (struct sgttyb *) 0);
if (fstat(fileno(tf), &stbuf) < 0)
return (PERMISSION_DENIED);
if ((stbuf.st_mode&020) == 0)
return (PERMISSION_DENIED);
print_mesg(tf, request, remote_machine);
fclose(tf);
return (SUCCESS);
}
#define max(a,b) ( (a) > (b) ? (a) : (b) )
#define N_LINES 5
#define N_CHARS 120
/*
* 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
* in in vi at the time
*/
static void
print_mesg(tf, request, remote_machine)
FILE *tf;
CTL_MSG *request;
char *remote_machine;
{
struct timeval clock;
time_t clocktime;
struct timezone zone;
struct tm *localclock;
char line_buf[N_LINES][N_CHARS];
int sizes[N_LINES];
char big_buf[N_LINES*N_CHARS];
char *bptr, *lptr, *vis_user;
int i, j, max_size;
i = 0;
max_size = 0;
gettimeofday(&clock, &zone);
clocktime = clock.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++;
vis_user = (char *) malloc(strlen(request->l_name) * 4 + 1);
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++ = '\007'; /* 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')
*(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';
fprintf(tf, big_buf);
fflush(tf);
ioctl(fileno(tf), TIOCNOTTY, (struct sgttyb *) 0);
}
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