From 37bac26f6edb2104829ed1b97061753530ecbdf8 Mon Sep 17 00:00:00 2001
From: Rainer Gerhards <rgerhards@adiscon.com>
Date: Wed, 16 Jul 2008 11:57:18 +0200
Subject: added a samll diagnostic tool to obtain result of gethostname() API

---
 ChangeLog         |  1 +
 configure.ac      | 14 ++++++++++++++
 tools/Makefile.am |  6 +++++-
 tools/gethostn.c  | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 66 insertions(+), 1 deletion(-)
 create mode 100644 tools/gethostn.c

diff --git a/ChangeLog b/ChangeLog
index 62a850ed..55637e41 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -2,6 +2,7 @@
 Version 3.21.0  [DEVEL] (rgerhards), 2008-??-??
 - added a generic test driver for RainerScript plus some test cases
   to the testbench
+- added a samll diagnostic tool to obtain result of gethostname() API
 ---------------------------------------------------------------------------
 Version 3.19.11 [BETA] (rgerhards), 2008-??-??
 ---------------------------------------------------------------------------
diff --git a/configure.ac b/configure.ac
index 43888d64..91641416 100644
--- a/configure.ac
+++ b/configure.ac
@@ -326,6 +326,19 @@ if test "$enable_valgrind" = "yes"; then
 fi
 
 
+# compile diagnostic tools (small helpers usually not needed)
+AC_ARG_ENABLE(diagtools,
+        [AS_HELP_STRING([--enable-diagtools],[Enable diagnostic tools @<:@default=no@:>@])],
+        [case "${enableval}" in
+         yes) enable_diagtools="yes" ;;
+          no) enable_diagtools="no" ;;
+           *) AC_MSG_ERROR(bad value ${enableval} for --enable-diagtools) ;;
+         esac],
+        [enable_mail=no]
+)
+AM_CONDITIONAL(ENABLE_DIAGTOOLS, test x$enable_diagtools = xyes)
+
+
 
 # MySQL support
 AC_ARG_ENABLE(mysql,
@@ -666,6 +679,7 @@ echo "GnuTLS network stream driver enabled:     $enable_gnutls"
 echo "Enable GSSAPI Kerberos 5 support:         $want_gssapi_krb5"
 echo "Debug mode enabled:                       $enable_debug"
 echo "Runtime Instrumentation enabled:          $enable_rtinst"
+echo "Diagnostic tools enabled:                 $enable_diagtools"
 echo "valgrind support settings enabled:        $enable_valgrind"
 echo "rsyslog runtime will be built:            $enable_rsyslogrt"
 echo "rsyslogd will be built:                   $enable_rsyslogd"
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;
+}
-- 
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