added a samll diagnostic tool to obtain result of gethostname() API

2 files changed, 51 insertions, 1 deletions

diff --git a/tools/Makefile.am b/tools/Makefile.am
index b2b7a8ca..a265af9c 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -21,9 +21,13 @@ rsyslogd_SOURCES = \
 	pidfile.h \
 	\
 	../dirty.h
-
 rsyslogd_CPPFLAGS =  $(pthreads_cflags) $(rsrt_cflags)
 rsyslogd_LDADD = $(zlib_libs) $(pthreads_libs) $(rsrt_libs)
 rsyslogd_LDFLAGS = -export-dynamic
 
+if ENABLE_DIAGTOOLS
+sbin_PROGRAMS += rsyslog_diag_hostname
+rsyslog_diag_hostname_SOURCES = gethostn.c
+endif
+
 EXTRA_DIST = $(man_MANS)
diff --git a/tools/gethostn.c b/tools/gethostn.c
new file mode 100644
index 00000000..746b9381
--- /dev/null
+++ b/tools/gethostn.c
@@ -0,0 +1,46 @@
+/* gethostn - a small diagnostic utility to show what the
+ * gethostname() API returns. Of course, this tool duplicates
+ * functionality already found in other tools. But the point is
+ * that the API shall be called by a program that is compiled like
+ * rsyslogd and does exactly what rsyslog does.
+ *
+ * Copyright 2008 Rainer Gerhards and Adiscon GmbH.
+ *
+ * This file is part of rsyslog.
+ *
+ * Rsyslog is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Rsyslog is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Rsyslog.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * A copy of the GPL can be found in the file "COPYING" in this distribution.
+ */
+
+#include "config.h"
+#include <stdio.h>
+#include <unistd.h>
+
+int main(int __attribute__((unused)) argc, char __attribute__((unused)) *argv[])
+{
+	char hostname[4096]; /* this should always be sufficient ;) */
+	int err;
+
+	err = gethostname(hostname, sizeof(hostname));
+
+	if(err) {
+		perror("gethostname failed");
+		exit(1);
+	}
+
+	printf("hostname of this system is '%s'.\n", hostname);
+
+	return 0;
+}