203 lines
6.2 KiB
C
203 lines
6.2 KiB
C
/*
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* Copyright (c) 1983 Regents of the University of California.
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* 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#ifndef lint
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/*static char sccsid[] = "from: @(#)announce.c 5.9 (Berkeley) 2/26/91";*/
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static char rcsid[] = "$Id: announce.c,v 1.6 1996/07/17 18:46:58 rat Exp $";
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#endif /* not lint */
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#include <sys/types.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 <sgtty.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 <vis.h>
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#include <paths.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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* Because the tty driver insists on attaching a terminal-less
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* process to any terminal that it writes on, we must fork a child
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* to protect ourselves
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*/
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announce(request, remote_machine)
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CTL_MSG *request;
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char *remote_machine;
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{
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int pid, val, status;
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if (pid = fork()) {
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/* we are the parent, so wait for the child */
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if (pid == -1) /* the fork failed */
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return (FAILED);
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do {
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val = wait(&status);
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if (val == -1) {
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if (errno == EINTR)
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continue;
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/* shouldn't happen */
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syslog(LOG_WARNING, "announce: wait: %m");
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return (FAILED);
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}
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} while (val != pid);
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if (status&0377 > 0) /* we were killed by some signal */
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return (FAILED);
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/* Get the second byte, this is the exit/return code */
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return ((status >> 8) & 0377);
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}
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/* we are the child, go and do it */
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_exit(announce_proc(request, remote_machine));
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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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announce_proc(request, remote_machine)
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CTL_MSG *request;
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char *remote_machine;
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{
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int pid, status;
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char full_tty[32];
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FILE *tf;
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struct stat stbuf;
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(void)snprintf(full_tty, sizeof(full_tty), "%s/%s", _PATH_DEV,
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request->r_tty);
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if (access(full_tty, 0) != 0)
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return (FAILED);
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if ((tf = fopen(full_tty, "w")) == NULL)
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return (PERMISSION_DENIED);
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/*
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* On first tty open, the server will have
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* it's pgrp set, so disconnect us from the
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* tty before we catch a signal.
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*/
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ioctl(fileno(tf), TIOCNOTTY, (struct sgttyb *) 0);
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if (fstat(fileno(tf), &stbuf) < 0)
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return (PERMISSION_DENIED);
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if ((stbuf.st_mode&020) == 0)
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return (PERMISSION_DENIED);
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print_mesg(tf, request, remote_machine);
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fclose(tf);
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return (SUCCESS);
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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 120
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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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* in in vi at the time
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*/
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print_mesg(tf, request, remote_machine)
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FILE *tf;
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CTL_MSG *request;
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char *remote_machine;
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{
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struct timeval clock;
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time_t clocktime;
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struct timezone zone;
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struct tm *localclock;
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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*N_CHARS];
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char *bptr, *lptr, *vis_user;
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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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gettimeofday(&clock, &zone);
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clocktime = clock.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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vis_user = (char *) malloc(strlen(request->l_name) * 4 + 1);
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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++ = ''; /* 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')
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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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fprintf(tf, big_buf);
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fflush(tf);
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ioctl(fileno(tf), TIOCNOTTY, (struct sgttyb *) 0);
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}
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