BSD 4.4 Lite Libexec Sources

1 files changed, 159 insertions, 0 deletions

diff --git a/libexec/talkd/announce.c b/libexec/talkd/announce.c
new file mode 100644
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--- /dev/null
+++ b/libexec/talkd/announce.c
@@ -0,0 +1,159 @@
+/*
+ * 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	8.2 (Berkeley) 1/7/94";
+#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 <sgtty.h>
+#include <errno.h>
+#include <syslog.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <paths.h>
+
+extern char hostname[];
+
+/*
+ * Announce an invitation to talk.
+ */
+	
+/*
+ * 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 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
+ */
+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, *ttymsg();
+	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++;
+	(void)sprintf(line_buf[i], "talk: connection requested by %s@%s",
+		request->l_name, 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",
+		request->l_name, 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);
+}