1 files changed, 96 insertions, 0 deletions
diff --git a/smtpd/unpack_dns.h b/smtpd/unpack_dns.h
new file mode 100644
index 00000000..2318a0c5
--- /dev/null
+++ b/smtpd/unpack_dns.h
@@ -0,0 +1,96 @@
+/*	$OpenBSD: unpack_dns.h,v 1.1 2018/01/06 07:57:53 sunil Exp $	*/
+
+/*
+ * Copyright (c) 2011-2014 Eric Faurot <eric@faurot.net>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+
+#include <netinet/in.h>
+
+#include <arpa/inet.h>
+#include <arpa/nameser.h>
+
+struct unpack {
+	const char	*buf;
+	size_t		 len;
+	size_t		 offset;
+	const char	*err;
+};
+
+struct dns_header {
+	uint16_t	id;
+	uint16_t	flags;
+	uint16_t	qdcount;
+	uint16_t	ancount;
+	uint16_t	nscount;
+	uint16_t	arcount;
+};
+
+struct dns_query {
+	char		q_dname[MAXDNAME];
+	uint16_t	q_type;
+	uint16_t	q_class;
+};
+
+struct dns_rr {
+	char		rr_dname[MAXDNAME];
+	uint16_t	rr_type;
+	uint16_t	rr_class;
+	uint32_t	rr_ttl;
+	union {
+		struct {
+			char	cname[MAXDNAME];
+		} cname;
+		struct {
+			uint16_t	preference;
+			char		exchange[MAXDNAME];
+		} mx;
+		struct {
+			char	nsname[MAXDNAME];
+		} ns;
+		struct {
+			char	ptrname[MAXDNAME];
+		} ptr;
+		struct {
+			char		mname[MAXDNAME];
+			char		rname[MAXDNAME];
+			uint32_t	serial;
+			uint32_t	refresh;
+			uint32_t	retry;
+			uint32_t	expire;
+			uint32_t	minimum;
+		} soa;
+		struct {
+			struct in_addr	addr;
+		} in_a;
+		struct {
+			struct in6_addr	addr6;
+		} in_aaaa;
+		struct {
+			uint16_t	 rdlen;
+			const void	*rdata;
+		} other;
+	} rr;
+};
+
+void	 unpack_init(struct unpack *, const char *, size_t);
+int	 unpack_header(struct unpack *, struct dns_header *);
+int	 unpack_rr(struct unpack *, struct dns_rr *);
+int	 unpack_query(struct unpack *, struct dns_query *);
+char    *print_dname(const char *, char *, size_t);
+ssize_t	 dname_expand(const unsigned char *, size_t, size_t, size_t *,
+	    char *, size_t);
+