1 files changed, 90 insertions, 0 deletions
diff --git a/src/lib-dns/dns-lookup.h b/src/lib-dns/dns-lookup.h
new file mode 100644
index 0000000..38d65f6
--- /dev/null
+++ b/src/lib-dns/dns-lookup.h
@@ -0,0 +1,90 @@
+#ifndef DNS_LOOKUP_H
+#define DNS_LOOKUP_H
+
+#define DNS_CLIENT_SOCKET_NAME "dns-client"
+
+struct dns_lookup;
+
+struct dns_lookup_settings {
+	const char *dns_client_socket_path;
+	unsigned int timeout_msecs;
+	/* the idle_timeout_msecs works only with the dns_client_* API.
+	   0 = disconnect immediately */
+	unsigned int idle_timeout_msecs;
+
+	/* ioloop to run the lookup on (defaults to current_ioloop) */
+	struct ioloop *ioloop;
+	struct event *event_parent;
+};
+
+struct dns_lookup_result {
+	/* all is ok if ret=0, otherwise it contains net_gethosterror()
+	   compatible error code. error string is always set if ret != 0. */
+	int ret;
+	const char *error;
+
+	/* how many milliseconds the lookup took. */
+	unsigned int msecs;
+
+	/* for IP lookup: */
+	unsigned int ips_count;
+	const struct ip_addr *ips;
+	/* for PTR lookup: */
+	const char *name;
+};
+
+typedef void dns_lookup_callback_t(const struct dns_lookup_result *result,
+				   void *context);
+
+/* Do asynchronous DNS lookup via dns-client UNIX socket. Returns 0 if lookup
+   started, -1 if there was an error communicating with the UNIX socket.
+   When failing with -1, the callback is called before returning from the
+   function. */
+int dns_lookup(const char *host, const struct dns_lookup_settings *set,
+	       dns_lookup_callback_t *callback, void *context,
+	       struct dns_lookup **lookup_r) ATTR_NULL(4);
+#define dns_lookup(host, set, callback, context, lookup_r) \
+	dns_lookup(host - \
+		CALLBACK_TYPECHECK(callback, void (*)( \
+			const struct dns_lookup_result *, typeof(context))), \
+		set, (dns_lookup_callback_t *)callback, context, lookup_r)
+int dns_lookup_ptr(const struct ip_addr *ip,
+		   const struct dns_lookup_settings *set,
+		   dns_lookup_callback_t *callback, void *context,
+		   struct dns_lookup **lookup_r) ATTR_NULL(4);
+#define dns_lookup_ptr(host, set, callback, context, lookup_r) \
+	dns_lookup_ptr(host - \
+		CALLBACK_TYPECHECK(callback, void (*)( \
+			const struct dns_lookup_result *, typeof(context))), \
+		set, (dns_lookup_callback_t *)callback, context, lookup_r)
+/* Abort the DNS lookup without calling the callback. */
+void dns_lookup_abort(struct dns_lookup **lookup);
+
+void dns_lookup_switch_ioloop(struct dns_lookup *lookup);
+
+/* Alternative API for clients that need to do multiple DNS lookups. */
+struct dns_client *dns_client_init(const struct dns_lookup_settings *set);
+void dns_client_deinit(struct dns_client **client);
+
+/* Connect immediately to the dns-lookup socket. */
+int dns_client_connect(struct dns_client *client, const char **error_r);
+int dns_client_lookup(struct dns_client *client, const char *host,
+		      dns_lookup_callback_t *callback, void *context,
+		      struct dns_lookup **lookup_r) ATTR_NULL(4);
+#define dns_client_lookup(client, host, callback, context, lookup_r) \
+	dns_client_lookup(client, host - \
+		CALLBACK_TYPECHECK(callback, void (*)( \
+			const struct dns_lookup_result *, typeof(context))), \
+		(dns_lookup_callback_t *)callback, context, lookup_r)
+int dns_client_lookup_ptr(struct dns_client *client, const struct ip_addr *ip,
+			  dns_lookup_callback_t *callback, void *context,
+			  struct dns_lookup **lookup_r) ATTR_NULL(4);
+#define dns_client_lookup_ptr(client, host, callback, context, lookup_r) \
+	dns_client_lookup_ptr(client, host - \
+		CALLBACK_TYPECHECK(callback, void (*)( \
+			const struct dns_lookup_result *, typeof(context))), \
+		(dns_lookup_callback_t *)callback, context, lookup_r)
+
+void dns_client_switch_ioloop(struct dns_client *client);
+
+#endif