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-rw-r--r--src/util/valid_utf8_hostname.c87
1 files changed, 87 insertions, 0 deletions
diff --git a/src/util/valid_utf8_hostname.c b/src/util/valid_utf8_hostname.c
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+++ b/src/util/valid_utf8_hostname.c
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+/*++
+/* 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));
+}