replace the fork-based-non-blocking-resolver-hack by shiny async resolver

written by eric@. it is still experimental but still better than what we
had earlier so ... we'll improve in tree :)

diff by me with *lots* of help from eric@, tested by todd and I (and a
few people out there)

1 files changed, 189 insertions, 0 deletions

diff --git a/usr.sbin/smtpd/dnsutil.h b/usr.sbin/smtpd/dnsutil.h
new file mode 100644
index 00000000000..4c77245c652
--- /dev/null
+++ b/usr.sbin/smtpd/dnsutil.h
@@ -0,0 +1,189 @@
+/*
+ * Copyright (c) 2009,2010	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 <sys/socket.h>
+
+#include <netinet/in.h>
+
+#include "dnsdefs.h"
+
+struct packed {
+	char		*data;
+	size_t		 len;
+	size_t		 offset;
+	const char	*err;
+};
+
+struct header {
+	uint16_t	id;
+	uint16_t	flags;
+	uint16_t	qdcount;
+	uint16_t	ancount;
+	uint16_t	nscount;
+	uint16_t	arcount;
+};
+
+struct query {
+	char			 q_dname[DOMAIN_MAXLEN];
+	uint16_t		 q_type;
+	uint16_t		 q_class;
+};
+
+struct rr {
+	char		 rr_dname[DOMAIN_MAXLEN];
+	uint16_t	 rr_type;
+	uint16_t	 rr_class;
+	uint32_t	 rr_ttl;
+	union {
+		struct {
+			char	cname[DOMAIN_MAXLEN];
+		} cname;
+		struct {
+			uint16_t	preference;
+			char		exchange[DOMAIN_MAXLEN];
+		} mx;
+		struct {
+			char	nsname[DOMAIN_MAXLEN];
+		} ns;
+		struct {
+			char	ptrname[DOMAIN_MAXLEN];
+		} ptr;
+		struct {
+			char		mname[DOMAIN_MAXLEN];
+			char		rname[DOMAIN_MAXLEN];
+			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;
+};
+
+struct rr_dynamic {
+	const char		*rd_dname;
+	uint16_t		 rd_type;
+	uint16_t		 rd_class;
+	uint32_t		 rd_ttl;
+	union rr_subtype {
+		struct rr_cname {
+			char		*cname;
+		} cname;
+		struct rr_mx {
+			uint16_t	 preference;
+			char		*exchange;
+		} mx;
+		struct rr_ns {
+			char		*nsname;
+		} ns;
+		struct rr_ptr {
+			char		*ptrname;
+		} ptr;
+		struct rr_soa {
+			char		*mname;
+			char		*rname;
+			uint32_t	 serial;
+			uint32_t	 refresh;
+			uint32_t	 retry;
+			uint32_t	 expire;
+			uint32_t	 minimum;
+		} soa;
+		struct rr_in_a {
+			struct in_addr	 addr;
+		} in_a;
+		struct rr_in_aaaa {
+			struct in6_addr	 addr6;
+		} in_aaaa;
+		struct rr_other {
+			uint16_t	 rdlen;
+			void		*rdata;
+		} other;
+	} rd;
+};
+
+
+
+/* pack.c */
+void	packed_init(struct packed*, char*, size_t);
+
+int	unpack_data(struct packed*, void*, size_t);
+int	unpack_u16(struct packed*, uint16_t*);
+int	unpack_u32(struct packed*, uint32_t*);
+int	unpack_inaddr(struct packed*, struct in_addr*);
+int	unpack_in6addr(struct packed*, struct in6_addr*);
+int	unpack_dname(struct packed*, char*, size_t);
+int	unpack_header(struct packed*, struct header*);
+int	unpack_query(struct packed*, struct query*);
+int	unpack_rr(struct packed*, struct rr*);
+
+int	pack_data(struct packed*, const void*, size_t);
+int	pack_u16(struct packed*, uint16_t);
+int	pack_u32(struct packed*, uint32_t);
+int	pack_inaddr(struct packed*, struct in_addr);
+int	pack_in6addr(struct packed*, struct in6_addr);
+int	pack_header(struct packed*, const struct header*);
+int	pack_dname(struct packed*, const char*);
+int	pack_query(struct packed*, uint16_t, uint16_t, const char*);
+int	pack_rrdynamic(struct packed*, const struct rr_dynamic *rr);
+
+/* sockaddr.c */
+int	sockaddr_from_rr(struct sockaddr *, struct rr *);
+int	sockaddr_from_str(struct sockaddr *, int, const char *);
+void	sockaddr_set_port(struct sockaddr *, int);
+int	sockaddr_connect(const struct sockaddr *, int);
+int	sockaddr_listen(const struct sockaddr *, int);
+
+/* print.c */
+const char *print_host(struct sockaddr*, char*, size_t);
+const char *print_addr(struct sockaddr*, char*, size_t);
+const char *print_dname(const char*, char*, size_t);
+const char *print_header(struct header*, char*, size_t);
+const char *print_query(struct query*, char*, size_t);
+const char *print_rr(struct rr*, char*, size_t);
+const char *print_rrdynamic(struct rr_dynamic*, char*, size_t);
+
+const char *typetostr(uint16_t);
+const char *classtostr(uint16_t);
+const char *rcodetostr(uint16_t);
+
+uint16_t    strtotype(const char*);
+uint16_t    strtoclass(const char*);
+const char *inet6_ntoa(struct in6_addr);
+
+/* dname.c */
+size_t	    dname_len(const char *);
+size_t	    dname_depth(const char *);
+ssize_t	    dname_from_fqdn(const char*, char*, size_t);
+ssize_t	    dname_from_sockaddr(const struct sockaddr *, char*, size_t);
+int	    dname_is_in(const char*, const char*);
+int	    dname_is_wildcard(const char *);
+int	    dname_is_reverse(const char *);
+int	    dname_check_label(const char*, size_t);
+const char* dname_up(const char*, unsigned int);
+
+/* res_random.c */
+unsigned int res_randomid(void);