added unbound to external deps

external/unbound/libunbound/unbound-event.h

@@ -0,0 +1,135 @@
+/*
+ * unbound-event.h - unbound validating resolver public API with events
+ *
+ * Copyright (c) 2007, NLnet Labs. All rights reserved.
+ *
+ * This software is open source.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 
+ * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 
+ * Neither the name of the NLNET LABS nor the names of its contributors may
+ * be used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * \file
+ *
+ * This file contains the unbound interface for use with libevent.
+ * You have to use the same libevent that unbound was compiled with,
+ * otherwise it wouldn't work, the event and event_base structures would
+ * be different.  If unbound is compiled without libevent support then
+ * this header file is not supposed to be installed on the system.
+ *
+ * Use ub_ctx_create_event_base() to create an unbound context that uses
+ * the event base that you have made.  Then, use the ub_resolve_event call
+ * to add DNS resolve queries to the context.  Those then run when you
+ * call event_dispatch() on your event_base, and when they are done you
+ * get a function callback.
+ *
+ * This method does not fork another process or create a thread, the effort
+ * is done by the unbound state machines that are connected to the event_base.
+ */
+#ifndef _UB_UNBOUND_EVENT_H
+#define _UB_UNBOUND_EVENT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct ub_ctx;
+struct ub_result;
+struct event_base;
+
+typedef void (*ub_event_callback_t)(void*, int, void*, int, int, char*);
+
+/**
+ * Create a resolving and validation context.
+ * The information from /etc/resolv.conf and /etc/hosts is not utilised by
+ * default. Use ub_ctx_resolvconf and ub_ctx_hosts to read them.
+ * @param base: the event base that the caller has created.  The unbound
+ *	context uses this event base.
+ * @return a new context. default initialisation.
+ * 	returns NULL on error.
+ * You must use ub_resolve_event with this context.
+ * Do not call ub_ctx_async, ub_poll, ub_wait, ub_process, this is all done
+ * with the event_base.  Setup the options you like with the other functions.
+ */
+struct ub_ctx* ub_ctx_create_event(struct event_base* base);
+
+/**
+ * Set a new event_base on a context created with ub_ctx_create_event.
+ * Any outbound queries will be canceled.
+ * @param ctx the ub_ctx to update.  Must have been created with ub_ctx_create_event
+ * @param base the new event_base to attach to the ctx
+ * @return 0 if OK, else error
+ */
+int ub_ctx_set_event(struct ub_ctx* ctx, struct event_base* base); 
+
+/**
+ * Perform resolution and validation of the target name.
+ * Asynchronous, after a while, the callback will be called with your
+ * data and the result.  Uses the event_base user installed by creating the
+ * context with ub_ctx_create_event().
+ * @param ctx: context with event_base in it.
+ *	The context is finalized, and can no longer accept all config changes.
+ * @param name: domain name in text format (a string).
+ * @param rrtype: type of RR in host order, 1 is A.
+ * @param rrclass: class of RR in host order, 1 is IN (for internet).
+ * @param mydata: this data is your own data (you can pass NULL),
+ * 	and is passed on to the callback function.
+ * @param callback: this is called on completion of the resolution.
+ * 	It is called as:
+ * 	void callback(void* mydata, int rcode, void* packet, int packet_len,
+ * 		int sec, char* why_bogus)
+ * 	with mydata: the same as passed here, you may pass NULL,
+ * 	with rcode: 0 on no error, nonzero for mostly SERVFAIL situations,
+ *		this is a DNS rcode.
+ *	with packet: a buffer with DNS wireformat packet with the answer.
+ *		do not inspect if rcode != 0.
+ *		do not write or free the packet buffer, it is used internally
+ *		in unbound (for other callbacks that want the same data).
+ *	with packet_len: length in bytes of the packet buffer.
+ *	with sec: 0 if insecure, 1 if bogus, 2 if DNSSEC secure.
+ *	with why_bogus: text string explaining why it is bogus (or NULL).
+ *	These point to buffers inside unbound; do not deallocate the packet or
+ *	error string.
+ *
+ * 	If an error happens during processing, your callback will be called
+ * 	with error set to a nonzero value (and result==NULL).
+ * 	For localdata (etc/hosts) the callback is called immediately, before
+ * 	resolve_event returns, async_id=0 is returned.
+ * @param async_id: if you pass a non-NULL value, an identifier number is
+ *	returned for the query as it is in progress. It can be used to 
+ *	cancel the query.
+ * @return 0 if OK, else error.
+ */
+int ub_resolve_event(struct ub_ctx* ctx, const char* name, int rrtype, 
+	int rrclass, void* mydata, ub_event_callback_t callback, int* async_id);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _UB_UNBOUND_H */