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- /*
- * 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. 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[] = "@(#)announce.c 8.3 (Berkeley) 4/28/95";
- #endif /* not lint */
-
- #ifdef HAVE_CONFIG_H
- #include <config.h>
- #endif
-
- #include <sys/types.h>
- #include <sys/uio.h>
- #include <sys/stat.h>
- #include <sys/time.h>
- #include <sys/wait.h>
- #include <sys/socket.h>
- #ifndef HAVE_OSOCKADDR
- #include <osockaddr.h>
- #endif
- #include <protocols/talkd.h>
- #include <sgtty.h>
- #include <errno.h>
- #include <syslog.h>
- #include <unistd.h>
- #include <stdio.h>
- #include <string.h>
- #ifdef HAVE_VIS_H
- #include <vis.h>
- #endif
- #include <paths.h>
-
- extern char *hostname;
-
- extern char *ttymsg ();
-
- /*
- * Announce an invitation to talk.
- */
-
- #ifndef HAVE_VIS_H
-
- #define VIS_CSTYLE 0 /* dummy value */
-
- /* A simpler version of bsd's vis function. */
- static void
- strvis (dst, src, ignored)
- char *dst, *src;
- int ignored;
- {
- int ch;
- while (*src)
- switch (ch = *src++)
- {
- case '\b': *dst++ = '\\'; *dst++ = 'b'; break;
- case '\n': *dst++ = '\\'; *dst++ = 'n'; break;
- case '\t': *dst++ = '\\'; *dst++ = 't'; break;
- case '\a': *dst++ = '\\'; *dst++ = 'a'; break;
- case '\f': *dst++ = '\\'; *dst++ = 'f'; break;
- case '\\': *dst++ = '\\'; *dst++ = '\\'; break;
- default:
- if (isgraph (ch))
- *dst++ = ch;
- else
- dst += sprintf (dst, "\\%03o", ch);
- }
- *dst = 0;
- }
- #endif /* !HAVE_VIS_H */
-
- /*
- * See if the user is accepting messages. If so, announce that
- * a talk is requested.
- */
- announce(request, remote_machine)
- CTL_MSG *request;
- char *remote_machine;
- {
- char full_tty[32];
- FILE *tf;
- 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&020) == 0)
- return (PERMISSION_DENIED);
- return (print_mesg(request->r_tty, tf, 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
- * in in vi at the time
- */
- print_mesg(tty, tf, request, remote_machine)
- char *tty;
- FILE *tf;
- CTL_MSG *request;
- char *remote_machine;
- {
- struct timeval clock;
- struct timezone zone;
- struct tm *localtime();
- struct tm *localclock;
- struct iovec iovec;
- 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);
- localclock = localtime( &clock.tv_sec );
- (void)sprintf(line_buf[i], " ");
- sizes[i] = strlen(line_buf[i]);
- max_size = max(max_size, sizes[i]);
- i++;
- (void)sprintf(line_buf[i], "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)sprintf(line_buf[i], "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)sprintf(line_buf[i], "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)sprintf(line_buf[i], " ");
- sizes[i] = strlen(line_buf[i]);
- max_size = max(max_size, sizes[i]);
- i++;
- bptr = big_buf;
- *bptr++ = ''; /* 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';
- 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);
- }
-