1 files changed, 87 insertions, 0 deletions
diff --git a/src/util/valid_utf8_hostname.c b/src/util/valid_utf8_hostname.c
new file mode 100644
index 0000000..3d6922a
--- /dev/null
+++ b/src/util/valid_utf8_hostname.c
@@ -0,0 +1,87 @@
+/*++
+/* NAME
+/*	valid_utf8_hostname 3
+/* SUMMARY
+/*	validate (maybe UTF-8) domain name
+/* SYNOPSIS
+/*	#include <valid_utf8_hostname.h>
+/*
+/*	int	valid_utf8_hostname(
+/*	int	enable_utf8,
+/*	const char *domain,
+/*	int	gripe)
+/* DESCRIPTION
+/*	valid_utf8_hostname() is a wrapper around valid_hostname().
+/*	If EAI support is compiled in, and enable_utf8 is true, the
+/*	name is converted from UTF-8 to ASCII per IDNA rules, before
+/*	invoking valid_hostname().
+/* SEE ALSO
+/*	valid_hostname(3) STD3 hostname validation.
+/* DIAGNOSTICS
+/*	Fatal errors: memory allocation problem.
+/*	Warnings: malformed domain name.
+/* 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>
+
+ /*
+  * Utility library.
+  */
+#include <msg.h>
+#include <mymalloc.h>
+#include <stringops.h>
+#include <valid_hostname.h>
+#include <midna_domain.h>
+#include <valid_utf8_hostname.h>
+
+/* valid_utf8_hostname - validate internationalized domain name */
+
+int     valid_utf8_hostname(int enable_utf8, const char *name, int gripe)
+{
+    static const char myname[] = "valid_utf8_hostname";
+
+    /*
+     * Trivial cases first.
+     */
+    if (*name == 0) {
+	if (gripe)
+	    msg_warn("%s: empty domain name", myname);
+	return (0);
+    }
+
+    /*
+     * Convert non-ASCII domain name to ASCII and validate the result per
+     * STD3. midna_domain_to_ascii() applies valid_hostname() to the result.
+     * Propagate the gripe parameter for better diagnostics (note that
+     * midna_domain_to_ascii() logs a problem only when the result is not
+     * cached).
+     */
+#ifndef NO_EAI
+    if (enable_utf8 && !allascii(name)) {
+	if (midna_domain_to_ascii(name) == 0) {
+	    if (gripe)
+		msg_warn("%s: malformed UTF-8 domain name", myname);
+	    return (0);
+	} else {
+	    return (1);
+	}
+    }
+#endif
+
+    /*
+     * Validate ASCII name per STD3.
+     */
+    return (valid_hostname(name, gripe));
+}