1 files changed, 66 insertions, 0 deletions
diff --git a/src/util/get_domainname.c b/src/util/get_domainname.c
new file mode 100644
index 0000000..0897f52
--- /dev/null
+++ b/src/util/get_domainname.c
@@ -0,0 +1,66 @@
+/*++
+/* NAME
+/*	get_domainname 3
+/* SUMMARY
+/*	network domain name lookup
+/* SYNOPSIS
+/*	#include <get_domainname.h>
+/*
+/*	const char *get_domainname()
+/* DESCRIPTION
+/*	get_domainname() returns the local domain name as obtained
+/*	by stripping the hostname component from the result from
+/*	get_hostname().  The result is the hostname when get_hostname()
+/*	does not return a FQDN form ("foo"), or its result has only two
+/*	components ("foo.com").
+/* DIAGNOSTICS
+/*	Fatal errors: no hostname, invalid hostname.
+/* SEE ALSO
+/*	get_hostname(3)
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <string.h>
+
+/* Utility library. */
+
+#include "mymalloc.h"
+#include "get_hostname.h"
+#include "get_domainname.h"
+
+/* Local stuff. */
+
+static char *my_domain_name;
+
+/* get_domainname - look up my domain name */
+
+const char *get_domainname(void)
+{
+    const char *host;
+    const char *dot;
+
+    /*
+     * Use the hostname when it is not a FQDN ("foo"), or when the hostname
+     * actually is a domain name ("foo.com").
+     */
+    if (my_domain_name == 0) {
+	host = get_hostname();
+	if ((dot = strchr(host, '.')) == 0 || strchr(dot + 1, '.') == 0) {
+	    my_domain_name = mystrdup(host);
+	} else {
+	    my_domain_name = mystrdup(dot + 1);
+	}
+    }
+    return (my_domain_name);
+}