BSD 4.4 Lite Libexec Sources

1 files changed, 127 insertions, 0 deletions

diff --git a/libexec/talkd/talkd.c b/libexec/talkd/talkd.c
new file mode 100644
index 0000000..669931b
--- /dev/null
+++ b/libexec/talkd/talkd.c
@@ -0,0 +1,127 @@
+/*
+ * 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 copyright[] =
+"@(#) Copyright (c) 1983, 1993\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)talkd.c	8.1 (Berkeley) 6/4/93";
+#endif /* not lint */
+
+/*
+ * The top level of the daemon, the format is heavily borrowed
+ * from rwhod.c. Basically: find out who and where you are; 
+ * disconnect all descriptors and ttys, and then endless
+ * loop on waiting for and processing requests
+ */
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <protocols/talkd.h>
+#include <signal.h>
+#include <syslog.h>
+#include <time.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <paths.h>
+
+CTL_MSG		request;
+CTL_RESPONSE	response;
+
+int	sockt;
+int	debug = 0;
+void	timeout();
+long	lastmsgtime;
+
+char	hostname[32];
+
+#define TIMEOUT 30
+#define MAXIDLE 120
+
+main(argc, argv)
+	int argc;
+	char *argv[];
+{
+	register CTL_MSG *mp = &request;
+	int cc;
+
+	if (getuid()) {
+		fprintf(stderr, "%s: getuid: not super-user\n", argv[0]);
+		exit(1);
+	}
+	openlog("talkd", LOG_PID, LOG_DAEMON);
+	if (gethostname(hostname, sizeof (hostname) - 1) < 0) {
+		syslog(LOG_ERR, "gethostname: %m");
+		_exit(1);
+	}
+	if (chdir(_PATH_DEV) < 0) {
+		syslog(LOG_ERR, "chdir: %s: %m", _PATH_DEV);
+		_exit(1);
+	}
+	if (argc > 1 && strcmp(argv[1], "-d") == 0)
+		debug = 1;
+	signal(SIGALRM, timeout);
+	alarm(TIMEOUT);
+	for (;;) {
+		extern int errno;
+
+		cc = recv(0, (char *)mp, sizeof (*mp), 0);
+		if (cc != sizeof (*mp)) {
+			if (cc < 0 && errno != EINTR)
+				syslog(LOG_WARNING, "recv: %m");
+			continue;
+		}
+		lastmsgtime = time(0);
+		process_request(mp, &response);
+		/* can block here, is this what I want? */
+		cc = sendto(sockt, (char *)&response,
+		    sizeof (response), 0, (struct sockaddr *)&mp->ctl_addr,
+		    sizeof (mp->ctl_addr));
+		if (cc != sizeof (response))
+			syslog(LOG_WARNING, "sendto: %m");
+	}
+}
+
+void
+timeout()
+{
+
+	if (time(0) - lastmsgtime >= MAXIDLE)
+		_exit(0);
+	alarm(TIMEOUT);
+}