From 6ab44ef49916f9eb88bcda1c831e2d859f665a15 Mon Sep 17 00:00:00 2001
From: hjp <hjp>
Date: Wed, 14 Aug 2002 19:03:52 +0000
Subject: [PATCH] Print system's FQDN if no hostname is given.

---
 dns/fqdn.c | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/dns/fqdn.c b/dns/fqdn.c
index c12494b..6e590d2 100644
--- a/dns/fqdn.c
+++ b/dns/fqdn.c
@@ -1,9 +1,24 @@
-#include <netdb.h>
+/*
+ * fqdn - print fully qualified domain name(s)
+ *
+ * resolve all host names given on the comman line and print their
+ * fully qualified canonical names.
+ *
+ * If no argument is given, print the system's FQDN.
+ */
+
+#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
+
+#include <unistd.h>
+#include <netdb.h>
 
 #include "hstrerror.h"
 
+char cvs_id[] = "$Id: fqdn.c,v 1.2 2002-08-14 19:03:52 hjp Exp $";
+
 char *cmnd;
 
 void usage(void) {
@@ -14,11 +29,19 @@ void usage(void) {
 int main(int argc, char **argv) {
     int i;
     int rc = 0;
+    char hostname[256];
+    char *fake_argv[] = { argv[0], hostname, NULL };
 
     cmnd = argv[0];
 
     if (argc < 2) {
-	usage();
+	if (gethostname(hostname, sizeof(hostname)) == -1) {
+	    fprintf(stderr, "%s: cannot get hostname: %s\n",
+		    cmnd, strerror(errno));
+	    exit(1);
+	}
+	argv = fake_argv;
+	argc = 2;
     }
 
     for (i = 1; i < argc; i++) {