FM / dns

/usr/include/bind9/dns

Name	Size	Mode	Actions
acl.h	6477	0644	edit dl rm
adb.h	22267	0644	edit dl rm
badcache.h	3387	0644	edit dl rm
bit.h	798	0644	edit dl rm
byaddr.h	3598	0644	edit dl rm
cache.h	8730	0644	edit dl rm
callbacks.h	2280	0644	edit dl rm
catz.h	11881	0644	edit dl rm
cert.h	1465	0644	edit dl rm
client.h	14527	0644	edit dl rm
clientinfo.h	2015	0644	edit dl rm
compress.h	7047	0644	edit dl rm
db.h	50446	0644	edit dl rm
dbiterator.h	7385	0644	edit dl rm
dbtable.h	3167	0644	edit dl rm
diff.h	7039	0644	edit dl rm
dispatch.h	15538	0644	edit dl rm
dlz.h	10876	0644	edit dl rm
dlz_dlopen.h	4394	0644	edit dl rm
dns64.h	5720	0644	edit dl rm
dnsrps.h	2572	0644	edit dl rm
dnssec.h	12841	0644	edit dl rm
dnstap.h	10193	0644	edit dl rm
ds.h	1665	0644	edit dl rm
dsdigest.h	1713	0644	edit dl rm
dyndb.h	4869	0644	edit dl rm
ecdb.h	806	0644	edit dl rm
ecs.h	1250	0644	edit dl rm
edns.h	783	0644	edit dl rm
enumclass.h	1220	0644	edit dl rm
enumtype.h	8485	0644	edit dl rm
events.h	4451	0644	edit dl rm
fixedname.h	1652	0644	edit dl rm
forward.h	3060	0644	edit dl rm
geoip.h	2340	0644	edit dl rm
ipkeylist.h	2219	0644	edit dl rm
iptable.h	1521	0644	edit dl rm
journal.h	9712	0644	edit dl rm
kasp.h	12124	0644	edit dl rm
keydata.h	1047	0644	edit dl rm
keyflags.h	1277	0644	edit dl rm
keymgr.h	4107	0644	edit dl rm
keytable.h	7871	0644	edit dl rm
keyvalues.h	4083	0644	edit dl rm
lib.h	993	0644	edit dl rm
librpz.h	31401	0644	edit dl rm
lmdb.h	779	0644	edit dl rm
log.h	4029	0644	edit dl rm
lookup.h	2921	0644	edit dl rm
master.h	8786	0644	edit dl rm
masterdump.h	10133	0644	edit dl rm
message.h	39567	0644	edit dl rm
name.h	37781	0644	edit dl rm
ncache.h	4960	0644	edit dl rm
nsec.h	3065	0644	edit dl rm
nsec3.h	8258	0644	edit dl rm
nta.h	4846	0644	edit dl rm
opcode.h	1006	0644	edit dl rm
order.h	2010	0644	edit dl rm
peer.h	6475	0644	edit dl rm
portlist.h	2101	0644	edit dl rm
private.h	1962	0644	edit dl rm
rbt.h	37484	0644	edit dl rm
rcode.h	2472	0644	edit dl rm
rdata.h	22564	0644	edit dl rm
rdataclass.h	2248	0644	edit dl rm
rdatalist.h	2557	0644	edit dl rm
rdataset.h	18714	0644	edit dl rm
rdatasetiter.h	3912	0644	edit dl rm
rdataslab.h	4267	0644	edit dl rm
rdatastruct.h	62703	0644	edit dl rm
rdatatype.h	2290	0644	edit dl rm
request.h	9187	0644	edit dl rm
resolver.h	20152	0644	edit dl rm
result.h	9196	0644	edit dl rm
rootns.h	891	0644	edit dl rm
rpz.h	12156	0644	edit dl rm
rriterator.h	4214	0644	edit dl rm
rrl.h	6959	0644	edit dl rm
sdb.h	7350	0644	edit dl rm
sdlz.h	14090	0644	edit dl rm
secalg.h	1705	0644	edit dl rm
secproto.h	1556	0644	edit dl rm
soa.h	2179	0644	edit dl rm
ssu.h	7182	0644	edit dl rm
stats.h	24689	0644	edit dl rm
tcpmsg.h	3128	0644	edit dl rm
time.h	1693	0644	edit dl rm
timer.h	1050	0644	edit dl rm
tkey.h	7655	0644	edit dl rm
tsec.h	2946	0644	edit dl rm
tsig.h	8497	0644	edit dl rm
ttl.h	1876	0644	edit dl rm
types.h	14584	0644	edit dl rm
update.h	2004	0644	edit dl rm
validator.h	6679	0644	edit dl rm
version.h	679	0644	edit dl rm
view.h	35341	0644	edit dl rm
xfrin.h	2314	0644	edit dl rm
zone.h	65543	0644	edit dl rm
zonekey.h	776	0644	edit dl rm
zoneverify.h	1393	0644	edit dl rm
zt.h	5241	0644	edit dl rm

Edit: /usr/include/bind9/dns/dispatch.h (15538B)

/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */

#ifndef DNS_DISPATCH_H
#define DNS_DISPATCH_H 1

/*****
***** Module Info
*****/

/*! \file dns/dispatch.h
 * \brief
 * DNS Dispatch Management
 * 	Shared UDP and single-use TCP dispatches for queries and responses.
 *
 * MP:
 *
 *\li     	All locking is performed internally to each dispatch.
 * 	Restrictions apply to dns_dispatch_removeresponse().
 *
 * Reliability:
 *
 * Resources:
 *
 * Security:
 *
 *\li	Depends on the isc_socket_t and dns_message_t for prevention of
 *	buffer overruns.
 *
 * Standards:
 *
 *\li	None.
 */

/***
 *** Imports
 ***/

#include <inttypes.h>
#include <stdbool.h>

#include <isc/buffer.h>
#include <isc/lang.h>
#include <isc/mutex.h>
#include <isc/socket.h>
#include <isc/types.h>

#include <dns/types.h>

ISC_LANG_BEGINDECLS

/*%
 * This event is sent to a task when a response comes in.
 * No part of this structure should ever be modified by the caller,
 * other than parts of the buffer.  The holy parts of the buffer are
 * the base and size of the buffer.  All other parts of the buffer may
 * be used.  On event delivery the used region contains the packet.
 *
 * "id" is the received message id,
 *
 * "addr" is the host that sent it to us,
 *
 * "buffer" holds state on the received data.
 *
 * The "free" routine for this event will clean up itself as well as
 * any buffer space allocated from common pools.
 */

struct dns_dispatchevent {
	ISC_EVENT_COMMON(dns_dispatchevent_t); /*%< standard event common */
	isc_result_t	   result;	       /*%< result code */
	int32_t		   id;		       /*%< message id */
	isc_sockaddr_t	   addr;	       /*%< address recv'd from */
	struct in6_pktinfo pktinfo;	       /*%< reply info for v6 */
	isc_buffer_t	   buffer;	       /*%< data buffer */
	uint32_t	   attributes;	       /*%< mirrored from socket.h */
};

/*%
 * This is a set of one or more dispatches which can be retrieved
 * round-robin fashion.
 */
struct dns_dispatchset {
	isc_mem_t	  *mctx;
	dns_dispatch_t **dispatches;
	int		 ndisp;
	int		 cur;
	isc_mutex_t	 lock;
};

/*@{*/
/*%
 * Attributes for added dispatchers.
 *
 * Values with the mask 0xffff0000 are application defined.
 * Values with the mask 0x0000ffff are library defined.
 *
 * Insane values (like setting both TCP and UDP) are not caught.  Don't
 * do that.
 *
 * _PRIVATE
 *	The dispatcher cannot be shared.
 *
 * _TCP, _UDP
 *	The dispatcher is a TCP or UDP socket.
 *
 * _IPV4, _IPV6
 *	The dispatcher uses an IPv4 or IPv6 socket.
 *
 * _NOLISTEN
 *	The dispatcher should not listen on the socket.
 *
 * _MAKEQUERY
 *	The dispatcher can be used to issue queries to other servers, and
 *	accept replies from them.
 *
 * _RANDOMPORT
 *	Previously used to indicate that the port of a dispatch UDP must be
 *	chosen randomly.  This behavior now always applies and the attribute
 *	is obsoleted.
 *
 * _EXCLUSIVE
 *	A separate socket will be used on-demand for each transaction.
 */
#define DNS_DISPATCHATTR_PRIVATE   0x00000001U
#define DNS_DISPATCHATTR_TCP	   0x00000002U
#define DNS_DISPATCHATTR_UDP	   0x00000004U
#define DNS_DISPATCHATTR_IPV4	   0x00000008U
#define DNS_DISPATCHATTR_IPV6	   0x00000010U
#define DNS_DISPATCHATTR_NOLISTEN  0x00000020U
#define DNS_DISPATCHATTR_MAKEQUERY 0x00000040U
#define DNS_DISPATCHATTR_CONNECTED 0x00000080U
#define DNS_DISPATCHATTR_FIXEDID   0x00000100U
#define DNS_DISPATCHATTR_EXCLUSIVE 0x00000200U
#define DNS_DISPATCHATTR_CANREUSE  0x00000400U
/*@}*/

/*
 */
#define DNS_DISPATCHOPT_FIXEDID 0x00000001U

isc_result_t
dns_dispatchmgr_create(isc_mem_t *mctx, dns_dispatchmgr_t **mgrp);
/*%<
 * Creates a new dispatchmgr object.
 *
 * Requires:
 *\li	"mctx" be a valid memory context.
 *
 *\li	mgrp != NULL && *mgrp == NULL
 *
 * Returns:
 *\li	ISC_R_SUCCESS	-- all ok
 *
 *\li	anything else	-- failure
 */

void
dns_dispatchmgr_destroy(dns_dispatchmgr_t **mgrp);
/*%<
 * Destroys the dispatchmgr when it becomes empty.  This could be
 * immediately.
 *
 * Requires:
 *\li	mgrp != NULL && *mgrp is a valid dispatchmgr.
 */

void
dns_dispatchmgr_setblackhole(dns_dispatchmgr_t *mgr, dns_acl_t *blackhole);
/*%<
 * Sets the dispatcher's "blackhole list," a list of addresses that will
 * be ignored by all dispatchers created by the dispatchmgr.
 *
 * Requires:
 * \li	mgrp is a valid dispatchmgr
 * \li	blackhole is a valid acl
 */

dns_acl_t *
dns_dispatchmgr_getblackhole(dns_dispatchmgr_t *mgr);
/*%<
 * Gets a pointer to the dispatcher's current blackhole list,
 * without incrementing its reference count.
 *
 * Requires:
 *\li 	mgr is a valid dispatchmgr
 * Returns:
 *\li	A pointer to the current blackhole list, or NULL.
 */

void
dns_dispatchmgr_setblackportlist(dns_dispatchmgr_t *mgr,
				 dns_portlist_t	*portlist);
/*%<
 * This function is deprecated.  Use dns_dispatchmgr_setavailports() instead.
 *
 * Requires:
 *\li	mgr is a valid dispatchmgr
 */

dns_portlist_t *
dns_dispatchmgr_getblackportlist(dns_dispatchmgr_t *mgr);
/*%<
 * This function is deprecated and always returns NULL.
 *
 * Requires:
 *\li	mgr is a valid dispatchmgr
 */

isc_result_t
dns_dispatchmgr_setavailports(dns_dispatchmgr_t *mgr, isc_portset_t *v4portset,
			      isc_portset_t *v6portset);
/*%<
 * Sets a list of UDP ports that can be used for outgoing UDP messages.
 *
 * Requires:
 *\li	mgr is a valid dispatchmgr
 *\li	v4portset is NULL or a valid port set
 *\li	v6portset is NULL or a valid port set
 */

void
dns_dispatchmgr_setstats(dns_dispatchmgr_t *mgr, isc_stats_t *stats);
/*%<
 * Sets statistics counter for the dispatchmgr.  This function is expected to
 * be called only on zone creation (when necessary).
 * Once installed, it cannot be removed or replaced.  Also, there is no
 * interface to get the installed stats from the zone; the caller must keep the
 * stats to reference (e.g. dump) it later.
 *
 * Requires:
 *\li	mgr is a valid dispatchmgr with no managed dispatch.
 *\li	stats is a valid statistics supporting resolver statistics counters
 *	(see dns/stats.h).
 */

isc_result_t
dns_dispatch_getudp(dns_dispatchmgr_t *mgr, isc_socketmgr_t *sockmgr,
		    isc_taskmgr_t *taskmgr, const isc_sockaddr_t *localaddr,
		    unsigned int buffersize, unsigned int maxbuffers,
		    unsigned int maxrequests, unsigned int buckets,
		    unsigned int increment, unsigned int attributes,
		    unsigned int mask, dns_dispatch_t **dispp);

isc_result_t
dns_dispatch_getudp_dup(dns_dispatchmgr_t *mgr, isc_socketmgr_t *sockmgr,
			isc_taskmgr_t *taskmgr, const isc_sockaddr_t *localaddr,
			unsigned int buffersize, unsigned int maxbuffers,
			unsigned int maxrequests, unsigned int buckets,
			unsigned int increment, unsigned int attributes,
			unsigned int mask, dns_dispatch_t **dispp,
			dns_dispatch_t *dup);
/*%<
 * Attach to existing dns_dispatch_t if one is found with dns_dispatchmgr_find,
 * otherwise create a new UDP dispatch.
 *
 * Requires:
 *\li	All pointer parameters be valid for their respective types.
 *
 *\li	dispp != NULL && *disp == NULL
 *
 *\li	512 <= buffersize <= 64k
 *
 *\li	maxbuffers > 0
 *
 *\li	buckets < 2097169
 *
 *\li	increment > buckets
 *
 *\li	(attributes & DNS_DISPATCHATTR_TCP) == 0
 *
 * Returns:
 *\li	ISC_R_SUCCESS	-- success.
 *
 *\li	Anything else	-- failure.
 */

isc_result_t
dns_dispatch_createtcp(dns_dispatchmgr_t *mgr, isc_socket_t *sock,
		       isc_taskmgr_t *taskmgr, const isc_sockaddr_t *localaddr,
		       const isc_sockaddr_t *destaddr, unsigned int buffersize,
		       unsigned int maxbuffers, unsigned int maxrequests,
		       unsigned int buckets, unsigned int increment,
		       unsigned int attributes, dns_dispatch_t **dispp);
/*%<
 * Create a new dns_dispatch and attach it to the provided isc_socket_t.
 *
 * For all dispatches, "buffersize" is the maximum packet size we will
 * accept.
 *
 * "maxbuffers" and "maxrequests" control the number of buffers in the
 * overall system and the number of buffers which can be allocated to
 * requests.
 *
 * "buckets" is the number of buckets to use, and should be prime.
 *
 * "increment" is used in a collision avoidance function, and needs to be
 * a prime > buckets, and not 2.
 *
 * Requires:
 *
 *\li	mgr is a valid dispatch manager.
 *
 *\li	sock is a valid.
 *
 *\li	task is a valid task that can be used internally to this dispatcher.
 *
 * \li	512 <= buffersize <= 64k
 *
 *\li	maxbuffers > 0.
 *
 *\li	maxrequests <= maxbuffers.
 *
 *\li	buckets < 2097169 (the next prime after 65536 * 32)
 *
 *\li	increment > buckets (and prime).
 *
 *\li	attributes includes #DNS_DISPATCHATTR_TCP and does not include
 *	#DNS_DISPATCHATTR_UDP.
 *
 * Returns:
 *\li	ISC_R_SUCCESS	-- success.
 *
 *\li	Anything else	-- failure.
 */

void
dns_dispatch_attach(dns_dispatch_t *disp, dns_dispatch_t **dispp);
/*%<
 * Attach to a dispatch handle.
 *
 * Requires:
 *\li	disp is valid.
 *
 *\li	dispp != NULL && *dispp == NULL
 */

void
dns_dispatch_detach(dns_dispatch_t **dispp);
/*%<
 * Detaches from the dispatch.
 *
 * Requires:
 *\li	dispp != NULL and *dispp be a valid dispatch.
 */

void
dns_dispatch_starttcp(dns_dispatch_t *disp);
/*%<
 * Start processing of a TCP dispatch once the socket connects.
 *
 * Requires:
 *\li	'disp' is valid.
 */

isc_result_t
dns_dispatch_gettcp(dns_dispatchmgr_t *mgr, const isc_sockaddr_t *destaddr,
		    const isc_sockaddr_t *localaddr, bool *connected,
		    dns_dispatch_t **dispp);
/*
 * Attempt to connect to a existing TCP connection (connection completed
 * if connected == NULL).
 */

isc_result_t
dns_dispatch_addresponse(dns_dispatch_t *disp, unsigned int options,
			 const isc_sockaddr_t *dest, isc_task_t *task,
			 isc_taskaction_t action, void *arg, uint16_t *idp,
			 dns_dispentry_t **resp, isc_socketmgr_t *sockmgr);
/*%<
 * Add a response entry for this dispatch.
 *
 * "*idp" is filled in with the assigned message ID, and *resp is filled in
 * to contain the magic token used to request event flow stop.
 *
 * Arranges for the given task to get a callback for response packets.  When
 * the event is delivered, it must be returned using dns_dispatch_freeevent()
 * or through dns_dispatch_removeresponse() for another to be delivered.
 *
 * Requires:
 *\li	"idp" be non-NULL.
 *
 *\li	"task" "action" and "arg" be set as appropriate.
 *
 *\li	"dest" be non-NULL and valid.
 *
 *\li	"resp" be non-NULL and *resp be NULL
 *
 *\li	"sockmgr" be NULL or a valid socket manager.  If 'disp' has
 *	the DNS_DISPATCHATTR_EXCLUSIVE attribute, this must not be NULL,
 *	which also means dns_dispatch_addresponse() cannot be used.
 *
 * Ensures:
 *
 *\li	&lt;id, dest> is a unique tuple.  That means incoming messages
 *	are identifiable.
 *
 * Returns:
 *
 *\li	ISC_R_SUCCESS		-- all is well.
 *\li	ISC_R_NOMEMORY		-- memory could not be allocated.
 *\li	ISC_R_NOMORE		-- no more message ids can be allocated
 *				   for this destination.
 */

void
dns_dispatch_removeresponse(dns_dispentry_t	    **resp,
			    dns_dispatchevent_t **sockevent);
/*%<
 * Stops the flow of responses for the provided id and destination.
 * If "sockevent" is non-NULL, the dispatch event and associated buffer is
 * also returned to the system.
 *
 * Requires:
 *\li	"resp" != NULL and "*resp" contain a value previously allocated
 *	by dns_dispatch_addresponse();
 *
 *\li	May only be called from within the task given as the 'task'
 * 	argument to dns_dispatch_addresponse() when allocating '*resp'.
 */

isc_socket_t *
dns_dispatch_getentrysocket(dns_dispentry_t *resp);

isc_socket_t *
dns_dispatch_getsocket(dns_dispatch_t *disp);
/*%<
 * Return the socket associated with this dispatcher.
 *
 * Requires:
 *\li	disp is valid.
 *
 * Returns:
 *\li	The socket the dispatcher is using.
 */

isc_result_t
dns_dispatch_getlocaladdress(dns_dispatch_t *disp, isc_sockaddr_t *addrp);
/*%<
 * Return the local address for this dispatch.
 * This currently only works for dispatches using UDP sockets.
 *
 * Requires:
 *\li	disp is valid.
 *\li	addrp to be non null.
 *
 * Returns:
 *\li	ISC_R_SUCCESS
 *\li	ISC_R_NOTIMPLEMENTED
 */

void
dns_dispatch_cancel(dns_dispatch_t *disp);
/*%<
 * cancel outstanding clients
 *
 * Requires:
 *\li	disp is valid.
 */

unsigned int
dns_dispatch_getattributes(dns_dispatch_t *disp);
/*%<
 * Return the attributes (DNS_DISPATCHATTR_xxx) of this dispatch.  Only the
 * non-changeable attributes are expected to be referenced by the caller.
 *
 * Requires:
 *\li	disp is valid.
 */

void
dns_dispatch_changeattributes(dns_dispatch_t *disp, unsigned int attributes,
			      unsigned int mask);
/*%<
 * Set the bits described by "mask" to the corresponding values in
 * "attributes".
 *
 * That is:
 *
 * \code
 *	new = (old & ~mask) | (attributes & mask)
 * \endcode
 *
 * This function has a side effect when #DNS_DISPATCHATTR_NOLISTEN changes.
 * When the flag becomes off, the dispatch will start receiving on the
 * corresponding socket.  When the flag becomes on, receive events on the
 * corresponding socket will be canceled.
 *
 * Requires:
 *\li	disp is valid.
 *
 *\li	attributes are reasonable for the dispatch.  That is, setting the UDP
 *	attribute on a TCP socket isn't reasonable.
 */

void
dns_dispatch_importrecv(dns_dispatch_t *disp, isc_event_t *event);
/*%<
 * Inform the dispatcher of a socket receive.  This is used for sockets
 * shared between dispatchers and clients.  If the dispatcher fails to copy
 * or send the event, nothing happens.
 *
 * If the attribute DNS_DISPATCHATTR_NOLISTEN is not set, then
 * the dispatch is already handling a recv; return immediately.
 *
 * Requires:
 *\li 	disp is valid, and the attribute DNS_DISPATCHATTR_NOLISTEN is set.
 * 	event != NULL
 */

dns_dispatch_t *
dns_dispatchset_get(dns_dispatchset_t *dset);
/*%<
 * Retrieve the next dispatch from dispatch set 'dset', and increment
 * the round-robin counter.
 *
 * Requires:
 *\li 	dset != NULL
 */

isc_result_t
dns_dispatchset_create(isc_mem_t *mctx, isc_socketmgr_t *sockmgr,
		       isc_taskmgr_t *taskmgr, dns_dispatch_t *source,
		       dns_dispatchset_t **dsetp, int n);
/*%<
 * Given a valid dispatch 'source', create a dispatch set containing
 * 'n' UDP dispatches, with the remainder filled out by clones of the
 * source.
 *
 * Requires:
 *\li 	source is a valid UDP dispatcher
 *\li 	dsetp != NULL, *dsetp == NULL
 */

void
dns_dispatchset_cancelall(dns_dispatchset_t *dset, isc_task_t *task);
/*%<
 * Cancel socket operations for the dispatches in 'dset'.
 */

void
dns_dispatchset_destroy(dns_dispatchset_t **dsetp);
/*%<
 * Dereference all the dispatches in '*dsetp', free the dispatchset
 * memory, and set *dsetp to NULL.
 *
 * Requires:
 *\li 	dset is valid
 */

void
dns_dispatch_setdscp(dns_dispatch_t *disp, isc_dscp_t dscp);
isc_dscp_t
dns_dispatch_getdscp(dns_dispatch_t *disp);
/*%<
 * Set/get the DSCP value to be used when sending responses to clients,
 * as defined in the "listen-on" or "listen-on-v6" statements.
 *
 * Requires:
 *\li	disp is valid.
 */

isc_result_t
dns_dispatch_getnext(dns_dispentry_t *resp, dns_dispatchevent_t **sockevent);
/*%<
 * Free the sockevent and trigger the sending of the next item off the
 * dispatch queue if present.
 *
 * Requires:
 *\li	resp is valid
 *\li	*sockevent to be valid
 */

ISC_LANG_ENDDECLS

#endif /* DNS_DISPATCH_H */

cmd: