136 lines
5.8 KiB
C
136 lines
5.8 KiB
C
/*
|
|
* 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 */
|