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/usr/include/isc

Name	Size	Mode	Actions
app.h	10535	0644	edit dl rm
assertions.h	3314	0644	edit dl rm
atomic.h	4258	0644	edit dl rm
base64.h	2967	0644	edit dl rm
bind9.h	1185	0644	edit dl rm
bitstring.h	4478	0644	edit dl rm
boolean.h	1212	0644	edit dl rm
buffer.h	22941	0644	edit dl rm
bufferlist.h	1979	0644	edit dl rm
commandline.h	1823	0644	edit dl rm
condition.h	2011	0644	edit dl rm
counter.h	2328	0644	edit dl rm
dir.h	2569	0644	edit dl rm
entropy.h	9444	0644	edit dl rm
error.h	1871	0644	edit dl rm
event.h	3360	0644	edit dl rm
eventclass.h	1915	0644	edit dl rm
file.h	9259	0644	edit dl rm
formatcheck.h	1423	0644	edit dl rm
fsaccess.h	7954	0644	edit dl rm
hash.h	5973	0644	edit dl rm
heap.h	5754	0644	edit dl rm
hex.h	2911	0644	edit dl rm
hmacmd5.h	1964	0644	edit dl rm
httpd.h	2029	0644	edit dl rm
int.h	1873	0644	edit dl rm
interfaceiter.h	3631	0644	edit dl rm
iterated_hash.h	1512	0644	edit dl rm
keyboard.h	1510	0644	edit dl rm
lang.h	1158	0644	edit dl rm
lex.h	9653	0644	edit dl rm
lfsr.h	3480	0644	edit dl rm
lib.h	1594	0644	edit dl rm
list.h	5887	0644	edit dl rm
log.h	28964	0644	edit dl rm
magic.h	1471	0644	edit dl rm
md5.h	2527	0644	edit dl rm
mem.h	21767	0644	edit dl rm
msgcat.h	3256	0644	edit dl rm
msgs.h	8862	0644	edit dl rm
mutex.h	4061	0644	edit dl rm
mutexblock.h	1902	0644	edit dl rm
namespace.h	7184	0644	edit dl rm
net.h	9269	0644	edit dl rm
netaddr.h	4917	0644	edit dl rm
netdb.h	1392	0644	edit dl rm
offset.h	1898	0644	edit dl rm
once.h	1510	0644	edit dl rm
ondestroy.h	3327	0644	edit dl rm
os.h	1191	0644	edit dl rm
parseint.h	2058	0644	edit dl rm
platform.h	8623	0644	edit dl rm
print.h	2449	0644	edit dl rm
quota.h	2873	0644	edit dl rm
radix.h	7058	0644	edit dl rm
random.h	1826	0644	edit dl rm
ratelimiter.h	3564	0644	edit dl rm
refcount.h	6203	0644	edit dl rm
region.h	2497	0644	edit dl rm
resource.h	3396	0644	edit dl rm
result.h	4814	0644	edit dl rm
resultclass.h	2077	0644	edit dl rm
rwlock.h	3843	0644	edit dl rm
serial.h	1959	0644	edit dl rm
sha1.h	1806	0644	edit dl rm
sha2.h	5861	0644	edit dl rm
sockaddr.h	6578	0644	edit dl rm
socket.h	32969	0644	edit dl rm
stdio.h	2243	0644	edit dl rm
stdlib.h	1221	0644	edit dl rm
stdtime.h	1880	0644	edit dl rm
string.h	6404	0644	edit dl rm
symtab.h	4748	0644	edit dl rm
syslog.h	1373	0644	edit dl rm
task.h	19753	0644	edit dl rm
taskpool.h	3787	0644	edit dl rm
thread.h	1878	0644	edit dl rm
time.h	8045	0644	edit dl rm
timer.h	11285	0644	edit dl rm
types.h	5929	0644	edit dl rm
util.h	7934	0644	edit dl rm
version.h	1207	0644	edit dl rm
xml.h	1556	0644	edit dl rm

Edit: /usr/include/isc/socket.h (32969B)

/*
 * Copyright (C) 2004-2009  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 1998-2002  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC 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.
 */

/* $Id: socket.h,v 1.94 2009-10-01 01:30:01 sar Exp $ */

#ifndef ISC_SOCKET_H
#define ISC_SOCKET_H 1

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

/*! \file isc/socket.h
 * \brief Provides TCP and UDP sockets for network I/O.  The sockets are event
 * sources in the task system.
 *
 * When I/O completes, a completion event for the socket is posted to the
 * event queue of the task which requested the I/O.
 *
 * \li MP:
 *	The module ensures appropriate synchronization of data structures it
 *	creates and manipulates.
 *	Clients of this module must not be holding a socket's task's lock when
 *	making a call that affects that socket.  Failure to follow this rule
 *	can result in deadlock.
 *	The caller must ensure that isc_socketmgr_destroy() is called only
 *	once for a given manager.
 *
 * \li Reliability:
 *	No anticipated impact.
 *
 * \li Resources:
 *	TBS
 *
 * \li Security:
 *	No anticipated impact.
 *
 * \li Standards:
 *	None.
 */

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

#include <isc/lang.h>
#include <isc/types.h>
#include <isc/event.h>
#include <isc/eventclass.h>
#include <isc/time.h>
#include <isc/region.h>
#include <isc/sockaddr.h>
#include <isc/xml.h>

ISC_LANG_BEGINDECLS

/***
 *** Constants
 ***/

/*%
 * Maximum number of buffers in a scatter/gather read/write.  The operating
 * system in use must support at least this number (plus one on some.)
 */
#define ISC_SOCKET_MAXSCATTERGATHER	8

/*%
 * In isc_socket_bind() set socket option SO_REUSEADDR prior to calling
 * bind() if a non zero port is specified (AF_INET and AF_INET6).
 */
#define ISC_SOCKET_REUSEADDRESS		0x01U

/*%
 * Statistics counters.  Used as isc_statscounter_t values.
 */
enum {
	isc_sockstatscounter_udp4open = 0,
	isc_sockstatscounter_udp6open = 1,
	isc_sockstatscounter_tcp4open = 2,
	isc_sockstatscounter_tcp6open = 3,
	isc_sockstatscounter_unixopen = 4,

isc_sockstatscounter_udp4openfail = 5,
	isc_sockstatscounter_udp6openfail = 6,
	isc_sockstatscounter_tcp4openfail = 7,
	isc_sockstatscounter_tcp6openfail = 8,
	isc_sockstatscounter_unixopenfail = 9,

isc_sockstatscounter_udp4close = 10,
	isc_sockstatscounter_udp6close = 11,
	isc_sockstatscounter_tcp4close = 12,
	isc_sockstatscounter_tcp6close = 13,
	isc_sockstatscounter_unixclose = 14,
	isc_sockstatscounter_fdwatchclose = 15,

isc_sockstatscounter_udp4bindfail = 16,
	isc_sockstatscounter_udp6bindfail = 17,
	isc_sockstatscounter_tcp4bindfail = 18,
	isc_sockstatscounter_tcp6bindfail = 19,
	isc_sockstatscounter_unixbindfail = 20,
	isc_sockstatscounter_fdwatchbindfail = 21,

isc_sockstatscounter_udp4connect = 22,
	isc_sockstatscounter_udp6connect = 23,
	isc_sockstatscounter_tcp4connect = 24,
	isc_sockstatscounter_tcp6connect = 25,
	isc_sockstatscounter_unixconnect = 26,
	isc_sockstatscounter_fdwatchconnect = 27,

isc_sockstatscounter_udp4connectfail = 28,
	isc_sockstatscounter_udp6connectfail = 29,
	isc_sockstatscounter_tcp4connectfail = 30,
	isc_sockstatscounter_tcp6connectfail = 31,
	isc_sockstatscounter_unixconnectfail = 32,
	isc_sockstatscounter_fdwatchconnectfail = 33,

isc_sockstatscounter_tcp4accept = 34,
	isc_sockstatscounter_tcp6accept = 35,
	isc_sockstatscounter_unixaccept = 36,

isc_sockstatscounter_tcp4acceptfail = 37,
	isc_sockstatscounter_tcp6acceptfail = 38,
	isc_sockstatscounter_unixacceptfail = 39,

isc_sockstatscounter_udp4sendfail = 40,
	isc_sockstatscounter_udp6sendfail = 41,
	isc_sockstatscounter_tcp4sendfail = 42,
	isc_sockstatscounter_tcp6sendfail = 43,
	isc_sockstatscounter_unixsendfail = 44,
	isc_sockstatscounter_fdwatchsendfail = 45,

isc_sockstatscounter_udp4recvfail = 46,
	isc_sockstatscounter_udp6recvfail = 47,
	isc_sockstatscounter_tcp4recvfail = 48,
	isc_sockstatscounter_tcp6recvfail = 49,
	isc_sockstatscounter_unixrecvfail = 50,
	isc_sockstatscounter_fdwatchrecvfail = 51,

isc_sockstatscounter_max = 52
};

/***
 *** Types
 ***/

struct isc_socketevent {
	ISC_EVENT_COMMON(isc_socketevent_t);
	isc_result_t		result;		/*%< OK, EOF, whatever else */
	unsigned int		minimum;	/*%< minimum i/o for event */
	unsigned int		n;		/*%< bytes read or written */
	unsigned int		offset;		/*%< offset into buffer list */
	isc_region_t		region;		/*%< for single-buffer i/o */
	isc_bufferlist_t	bufferlist;	/*%< list of buffers */
	isc_sockaddr_t		address;	/*%< source address */
	isc_time_t		timestamp;	/*%< timestamp of packet recv */
	struct in6_pktinfo	pktinfo;	/*%< ipv6 pktinfo */
	isc_uint32_t		attributes;	/*%< see below */
	isc_eventdestructor_t   destroy;	/*%< original destructor */
};

typedef struct isc_socket_newconnev isc_socket_newconnev_t;
struct isc_socket_newconnev {
	ISC_EVENT_COMMON(isc_socket_newconnev_t);
	isc_socket_t *		newsocket;
	isc_result_t		result;		/*%< OK, EOF, whatever else */
	isc_sockaddr_t		address;	/*%< source address */
};

typedef struct isc_socket_connev isc_socket_connev_t;
struct isc_socket_connev {
	ISC_EVENT_COMMON(isc_socket_connev_t);
	isc_result_t		result;		/*%< OK, EOF, whatever else */
};

/*@{*/
/*!
 * _ATTACHED:	Internal use only.
 * _TRUNC:	Packet was truncated on receive.
 * _CTRUNC:	Packet control information was truncated.  This can
 *		indicate that the packet is not complete, even though
 *		all the data is valid.
 * _TIMESTAMP:	The timestamp member is valid.
 * _PKTINFO:	The pktinfo member is valid.
 * _MULTICAST:	The UDP packet was received via a multicast transmission.
 */
#define ISC_SOCKEVENTATTR_ATTACHED		0x80000000U /* internal */
#define ISC_SOCKEVENTATTR_TRUNC			0x00800000U /* public */
#define ISC_SOCKEVENTATTR_CTRUNC		0x00400000U /* public */
#define ISC_SOCKEVENTATTR_TIMESTAMP		0x00200000U /* public */
#define ISC_SOCKEVENTATTR_PKTINFO		0x00100000U /* public */
#define ISC_SOCKEVENTATTR_MULTICAST		0x00080000U /* public */
/*@}*/

#define ISC_SOCKEVENT_ANYEVENT  (0)
#define ISC_SOCKEVENT_RECVDONE	(ISC_EVENTCLASS_SOCKET + 1)
#define ISC_SOCKEVENT_SENDDONE	(ISC_EVENTCLASS_SOCKET + 2)
#define ISC_SOCKEVENT_NEWCONN	(ISC_EVENTCLASS_SOCKET + 3)
#define ISC_SOCKEVENT_CONNECT	(ISC_EVENTCLASS_SOCKET + 4)

/*
 * Internal events.
 */
#define ISC_SOCKEVENT_INTR	(ISC_EVENTCLASS_SOCKET + 256)
#define ISC_SOCKEVENT_INTW	(ISC_EVENTCLASS_SOCKET + 257)

typedef enum {
	isc_sockettype_udp = 1,
	isc_sockettype_tcp = 2,
	isc_sockettype_unix = 3,
	isc_sockettype_fdwatch = 4
} isc_sockettype_t;

/*@{*/
/*!
 * How a socket should be shutdown in isc_socket_shutdown() calls.
 */
#define ISC_SOCKSHUT_RECV	0x00000001	/*%< close read side */
#define ISC_SOCKSHUT_SEND	0x00000002	/*%< close write side */
#define ISC_SOCKSHUT_ALL	0x00000003	/*%< close them all */
/*@}*/

/*@{*/
/*!
 * What I/O events to cancel in isc_socket_cancel() calls.
 */
#define ISC_SOCKCANCEL_RECV	0x00000001	/*%< cancel recv */
#define ISC_SOCKCANCEL_SEND	0x00000002	/*%< cancel send */
#define ISC_SOCKCANCEL_ACCEPT	0x00000004	/*%< cancel accept */
#define ISC_SOCKCANCEL_CONNECT	0x00000008	/*%< cancel connect */
#define ISC_SOCKCANCEL_ALL	0x0000000f	/*%< cancel everything */
/*@}*/

/*@{*/
/*!
 * Flags for isc_socket_send() and isc_socket_recv() calls.
 */
#define ISC_SOCKFLAG_IMMEDIATE	0x00000001	/*%< send event only if needed */
#define ISC_SOCKFLAG_NORETRY	0x00000002	/*%< drop failed UDP sends */
/*@}*/

/*@{*/
/*!
 * Flags for fdwatchcreate.
 */
#define ISC_SOCKFDWATCH_READ	0x00000001	/*%< watch for readable */
#define ISC_SOCKFDWATCH_WRITE	0x00000002	/*%< watch for writable */
/*@}*/

/*% Socket and socket manager methods */
typedef struct isc_socketmgrmethods {
	void		(*destroy)(isc_socketmgr_t **managerp);
	isc_result_t	(*socketcreate)(isc_socketmgr_t *manager, int pf,
					isc_sockettype_t type,
					isc_socket_t **socketp);
	isc_result_t    (*fdwatchcreate)(isc_socketmgr_t *manager, int fd,
					 int flags,
					 isc_sockfdwatch_t callback,
					 void *cbarg, isc_task_t *task,
					 isc_socket_t **socketp);
} isc_socketmgrmethods_t;

typedef struct isc_socketmethods {
	void		(*attach)(isc_socket_t *socket,
				  isc_socket_t **socketp);
	void		(*detach)(isc_socket_t **socketp);
	isc_result_t	(*bind)(isc_socket_t *sock, isc_sockaddr_t *sockaddr,
				unsigned int options);
	isc_result_t	(*sendto)(isc_socket_t *sock, isc_region_t *region,
				  isc_task_t *task, isc_taskaction_t action,
				  const void *arg, isc_sockaddr_t *address,
				  struct in6_pktinfo *pktinfo);
	isc_result_t	(*connect)(isc_socket_t *sock, isc_sockaddr_t *addr,
				   isc_task_t *task, isc_taskaction_t action,
				   const void *arg);
	isc_result_t	(*recv)(isc_socket_t *sock, isc_region_t *region,
				unsigned int minimum, isc_task_t *task,
				isc_taskaction_t action, const void *arg);
	void		(*cancel)(isc_socket_t *sock, isc_task_t *task,
				  unsigned int how);
	isc_result_t	(*getsockname)(isc_socket_t *sock,
				       isc_sockaddr_t *addressp);
	isc_sockettype_t (*gettype)(isc_socket_t *sock);
	void		(*ipv6only)(isc_socket_t *sock, isc_boolean_t yes);
	isc_result_t    (*fdwatchpoke)(isc_socket_t *sock, int flags);
} isc_socketmethods_t;

/*%
 * This structure is actually just the common prefix of a socket manager
 * object implementation's version of an isc_socketmgr_t.
 * \brief
 * Direct use of this structure by clients is forbidden.  socket implementations
 * may change the structure.  'magic' must be ISCAPI_SOCKETMGR_MAGIC for any
 * of the isc_socket_ routines to work.  socket implementations must maintain
 * all socket invariants.
 * In effect, this definition is used only for non-BIND9 version ("export")
 * of the library, and the export version does not work for win32.  So, to avoid
 * the definition conflict with win32/socket.c, we enable this definition only
 * for non-Win32 (i.e. Unix) platforms.
 */
#ifndef WIN32
struct isc_socketmgr {
	unsigned int		impmagic;
	unsigned int		magic;
	isc_socketmgrmethods_t	*methods;
};
#endif

#define ISCAPI_SOCKETMGR_MAGIC		ISC_MAGIC('A','s','m','g')
#define ISCAPI_SOCKETMGR_VALID(m)	((m) != NULL && \
					 (m)->magic == ISCAPI_SOCKETMGR_MAGIC)

/*%
 * This is the common prefix of a socket object.  The same note as
 * that for the socketmgr structure applies.
 */
#ifndef WIN32
struct isc_socket {
	unsigned int		impmagic;
	unsigned int		magic;
	isc_socketmethods_t	*methods;
};
#endif

#define ISCAPI_SOCKET_MAGIC	ISC_MAGIC('A','s','c','t')
#define ISCAPI_SOCKET_VALID(s)	((s) != NULL && \
				 (s)->magic == ISCAPI_SOCKET_MAGIC)

/***
 *** Socket and Socket Manager Functions
 ***
 *** Note: all Ensures conditions apply only if the result is success for
 *** those functions which return an isc_result.
 ***/

isc_result_t
isc_socket_fdwatchcreate(isc_socketmgr_t *manager,
			 int fd,
			 int flags,
			 isc_sockfdwatch_t callback,
			 void *cbarg,
			 isc_task_t *task,
			 isc_socket_t **socketp);
/*%<
 * Create a new file descriptor watch socket managed by 'manager'.
 *
 * Note:
 *
 *\li   'fd' is the already-opened file descriptor.
 *\li	This function is not available on Windows.
 *\li	The callback function is called "in-line" - this means the function
 *	needs to return as fast as possible, as all other I/O will be suspended
 *	until the callback completes.
 *
 * Requires:
 *
 *\li	'manager' is a valid manager
 *
 *\li	'socketp' is a valid pointer, and *socketp == NULL
 *
 *\li	'fd' be opened.
 *
 * Ensures:
 *
 *	'*socketp' is attached to the newly created fdwatch socket
 *
 * Returns:
 *
 *\li	#ISC_R_SUCCESS
 *\li	#ISC_R_NOMEMORY
 *\li	#ISC_R_NORESOURCES
 *\li	#ISC_R_UNEXPECTED
 */

isc_result_t
isc_socket_fdwatchpoke(isc_socket_t *sock,
		       int flags);
/*%<
 * Poke a file descriptor watch socket informing the manager that it
 * should restart watching the socket
 *
 * Note:
 *
 *\li   'sock' is the socket returned by isc_socket_fdwatchcreate
 *
 *\li   'flags' indicates what the manager should watch for on the socket
 *      in addition to what it may already be watching.  It can be one or
 *      both of ISC_SOCKFDWATCH_READ and ISC_SOCKFDWATCH_WRITE.  To
 *      temporarily disable watching on a socket the value indicating
 *      no more data should be returned from the call back routine.
 *
 *\li	This function is not available on Windows.
 *
 * Requires:
 *
 *\li	'sock' is a valid isc socket
 *
 *
 * Returns:
 *
 *\li	#ISC_R_SUCCESS
 */

isc_result_t
isc_socket_create(isc_socketmgr_t *manager,
		  int pf,
		  isc_sockettype_t type,
		  isc_socket_t **socketp);
/*%<
 * Create a new 'type' socket managed by 'manager'.
 *
 * For isc_sockettype_fdwatch sockets you should use isc_socket_fdwatchcreate()
 * rather than isc_socket_create().
 *
 * Note:
 *
 *\li	'pf' is the desired protocol family, e.g. PF_INET or PF_INET6.
 *
 * Requires:
 *
 *\li	'manager' is a valid manager
 *
 *\li	'socketp' is a valid pointer, and *socketp == NULL
 *
 *\li	'type' is not isc_sockettype_fdwatch
 *
 * Ensures:
 *
 *	'*socketp' is attached to the newly created socket
 *
 * Returns:
 *
 *\li	#ISC_R_SUCCESS
 *\li	#ISC_R_NOMEMORY
 *\li	#ISC_R_NORESOURCES
 *\li	#ISC_R_UNEXPECTED
 */

void
isc_socket_cancel(isc_socket_t *sock, isc_task_t *task,
		  unsigned int how);
/*%<
 * Cancel pending I/O of the type specified by "how".
 *
 * Note: if "task" is NULL, then the cancel applies to all tasks using the
 * socket.
 *
 * Requires:
 *
 * \li	"socket" is a valid socket
 *
 * \li	"task" is NULL or a valid task
 *
 * "how" is a bitmask describing the type of cancelation to perform.
 * The type ISC_SOCKCANCEL_ALL will cancel all pending I/O on this
 * socket.
 *
 * \li ISC_SOCKCANCEL_RECV:
 *	Cancel pending isc_socket_recv() calls.
 *
 * \li ISC_SOCKCANCEL_SEND:
 *	Cancel pending isc_socket_send() and isc_socket_sendto() calls.
 *
 * \li ISC_SOCKCANCEL_ACCEPT:
 *	Cancel pending isc_socket_accept() calls.
 *
 * \li ISC_SOCKCANCEL_CONNECT:
 *	Cancel pending isc_socket_connect() call.
 */

void
isc_socket_shutdown(isc_socket_t *sock, unsigned int how);
/*%<
 * Shutdown 'socket' according to 'how'.
 *
 * Requires:
 *
 * \li	'socket' is a valid socket.
 *
 * \li	'task' is NULL or is a valid task.
 *
 * \li	If 'how' is 'ISC_SOCKSHUT_RECV' or 'ISC_SOCKSHUT_ALL' then
 *
 *		The read queue must be empty.
 *
 *		No further read requests may be made.
 *
 * \li	If 'how' is 'ISC_SOCKSHUT_SEND' or 'ISC_SOCKSHUT_ALL' then
 *
 *		The write queue must be empty.
 *
 *		No further write requests may be made.
 */

void
isc_socket_attach(isc_socket_t *sock, isc_socket_t **socketp);
/*%<
 * Attach *socketp to socket.
 *
 * Requires:
 *
 * \li	'socket' is a valid socket.
 *
 * \li	'socketp' points to a NULL socket.
 *
 * Ensures:
 *
 * \li	*socketp is attached to socket.
 */

void
isc_socket_detach(isc_socket_t **socketp);
/*%<
 * Detach *socketp from its socket.
 *
 * Requires:
 *
 * \li	'socketp' points to a valid socket.
 *
 * \li	If '*socketp' is the last reference to the socket,
 *	then:
 *
 *		There must be no pending I/O requests.
 *
 * Ensures:
 *
 * \li	*socketp is NULL.
 *
 * \li	If '*socketp' is the last reference to the socket,
 *	then:
 *
 *		The socket will be shutdown (both reading and writing)
 *		for all tasks.
 *
 *		All resources used by the socket have been freed
 */

isc_result_t
isc_socket_open(isc_socket_t *sock);
/*%<
 * Open a new socket file descriptor of the given socket structure.  It simply
 * opens a new descriptor; all of the other parameters including the socket
 * type are inherited from the existing socket.  This function is provided to
 * avoid overhead of destroying and creating sockets when many short-lived
 * sockets are frequently opened and closed.  When the efficiency is not an
 * issue, it should be safer to detach the unused socket and re-create a new
 * one.  This optimization may not be available for some systems, in which
 * case this function will return ISC_R_NOTIMPLEMENTED and must not be used.
 *
 * isc_socket_open() should not be called on sockets created by
 * isc_socket_fdwatchcreate().
 *
 * Requires:
 *
 * \li	there must be no other reference to this socket.
 *
 * \li	'socket' is a valid and previously closed by isc_socket_close()
 *
 * \li  'sock->type' is not isc_sockettype_fdwatch
 *
 * Returns:
 *	Same as isc_socket_create().
 * \li	ISC_R_NOTIMPLEMENTED
 */

isc_result_t
isc_socket_close(isc_socket_t *sock);
/*%<
 * Close a socket file descriptor of the given socket structure.  This function
 * is provided as an alternative to destroying an unused socket when overhead
 * destroying/re-creating sockets can be significant, and is expected to be
 * used with isc_socket_open().  This optimization may not be available for some
 * systems, in which case this function will return ISC_R_NOTIMPLEMENTED and
 * must not be used.
 *
 * isc_socket_close() should not be called on sockets created by
 * isc_socket_fdwatchcreate().
 *
 * Requires:
 *
 * \li	The socket must have a valid descriptor.
 *
 * \li	There must be no other reference to this socket.
 *
 * \li	There must be no pending I/O requests.
 *
 * \li  'sock->type' is not isc_sockettype_fdwatch
 *
 * Returns:
 * \li	#ISC_R_NOTIMPLEMENTED
 */

isc_result_t
isc_socket_bind(isc_socket_t *sock, isc_sockaddr_t *addressp,
		unsigned int options);
/*%<
 * Bind 'socket' to '*addressp'.
 *
 * Requires:
 *
 * \li	'socket' is a valid socket
 *
 * \li	'addressp' points to a valid isc_sockaddr.
 *
 * Returns:
 *
 * \li	ISC_R_SUCCESS
 * \li	ISC_R_NOPERM
 * \li	ISC_R_ADDRNOTAVAIL
 * \li	ISC_R_ADDRINUSE
 * \li	ISC_R_BOUND
 * \li	ISC_R_UNEXPECTED
 */

isc_result_t
isc_socket_filter(isc_socket_t *sock, const char *filter);
/*%<
 * Inform the kernel that it should perform accept filtering.
 * If filter is NULL the current filter will be removed.:w
 */

isc_result_t
isc_socket_listen(isc_socket_t *sock, unsigned int backlog);
/*%<
 * Set listen mode on the socket.  After this call, the only function that
 * can be used (other than attach and detach) is isc_socket_accept().
 *
 * Notes:
 *
 * \li	'backlog' is as in the UNIX system call listen() and may be
 *	ignored by non-UNIX implementations.
 *
 * \li	If 'backlog' is zero, a reasonable system default is used, usually
 *	SOMAXCONN.
 *
 * Requires:
 *
 * \li	'socket' is a valid, bound TCP socket or a valid, bound UNIX socket.
 *
 * Returns:
 *
 * \li	ISC_R_SUCCESS
 * \li	ISC_R_UNEXPECTED
 */

isc_result_t
isc_socket_accept(isc_socket_t *sock,
		  isc_task_t *task, isc_taskaction_t action, const void *arg);
/*%<
 * Queue accept event.  When a new connection is received, the task will
 * get an ISC_SOCKEVENT_NEWCONN event with the sender set to the listen
 * socket.  The new socket structure is sent inside the isc_socket_newconnev_t
 * event type, and is attached to the task 'task'.
 *
 * REQUIRES:
 * \li	'socket' is a valid TCP socket that isc_socket_listen() was called
 *	on.
 *
 * \li	'task' is a valid task
 *
 * \li	'action' is a valid action
 *
 * RETURNS:
 * \li	ISC_R_SUCCESS
 * \li	ISC_R_NOMEMORY
 * \li	ISC_R_UNEXPECTED
 */

isc_result_t
isc_socket_connect(isc_socket_t *sock, isc_sockaddr_t *addressp,
		   isc_task_t *task, isc_taskaction_t action,
		   const void *arg);
/*%<
 * Connect 'socket' to peer with address *saddr.  When the connection
 * succeeds, or when an error occurs, a CONNECT event with action 'action'
 * and arg 'arg' will be posted to the event queue for 'task'.
 *
 * Requires:
 *
 * \li	'socket' is a valid TCP socket
 *
 * \li	'addressp' points to a valid isc_sockaddr
 *
 * \li	'task' is a valid task
 *
 * \li	'action' is a valid action
 *
 * Returns:
 *
 * \li	ISC_R_SUCCESS
 * \li	ISC_R_NOMEMORY
 * \li	ISC_R_UNEXPECTED
 *
 * Posted event's result code:
 *
 * \li	ISC_R_SUCCESS
 * \li	ISC_R_TIMEDOUT
 * \li	ISC_R_CONNREFUSED
 * \li	ISC_R_NETUNREACH
 * \li	ISC_R_UNEXPECTED
 */

isc_result_t
isc_socket_getpeername(isc_socket_t *sock, isc_sockaddr_t *addressp);
/*%<
 * Get the name of the peer connected to 'socket'.
 *
 * Requires:
 *
 * \li	'socket' is a valid TCP socket.
 *
 * Returns:
 *
 * \li	ISC_R_SUCCESS
 * \li	ISC_R_TOOSMALL
 * \li	ISC_R_UNEXPECTED
 */

isc_result_t
isc_socket_getsockname(isc_socket_t *sock, isc_sockaddr_t *addressp);
/*%<
 * Get the name of 'socket'.
 *
 * Requires:
 *
 * \li	'socket' is a valid socket.
 *
 * Returns:
 *
 * \li	ISC_R_SUCCESS
 * \li	ISC_R_TOOSMALL
 * \li	ISC_R_UNEXPECTED
 */

/*@{*/
isc_result_t
isc_socket_recv(isc_socket_t *sock, isc_region_t *region,
		unsigned int minimum,
		isc_task_t *task, isc_taskaction_t action, const void *arg);
isc_result_t
isc_socket_recvv(isc_socket_t *sock, isc_bufferlist_t *buflist,
		 unsigned int minimum,
		 isc_task_t *task, isc_taskaction_t action, const void *arg);

isc_result_t
isc_socket_recv2(isc_socket_t *sock, isc_region_t *region,
		 unsigned int minimum, isc_task_t *task,
		 isc_socketevent_t *event, unsigned int flags);

/*!
 * Receive from 'socket', storing the results in region.
 *
 * Notes:
 *
 *\li	Let 'length' refer to the length of 'region' or to the sum of all
 *	available regions in the list of buffers '*buflist'.
 *
 *\li	If 'minimum' is non-zero and at least that many bytes are read,
 *	the completion event will be posted to the task 'task.'  If minimum
 *	is zero, the exact number of bytes requested in the region must
 * 	be read for an event to be posted.  This only makes sense for TCP
 *	connections, and is always set to 1 byte for UDP.
 *
 *\li	The read will complete when the desired number of bytes have been
 *	read, if end-of-input occurs, or if an error occurs.  A read done
 *	event with the given 'action' and 'arg' will be posted to the
 *	event queue of 'task'.
 *
 *\li	The caller may not modify 'region', the buffers which are passed
 *	into this function, or any data they refer to until the completion
 *	event is received.
 *
 *\li	For isc_socket_recvv():
 *	On successful completion, '*buflist' will be empty, and the list of
 *	all buffers will be returned in the done event's 'bufferlist'
 *	member.  On error return, '*buflist' will be unchanged.
 *
 *\li	For isc_socket_recv2():
 *	'event' is not NULL, and the non-socket specific fields are
 *	expected to be initialized.
 *
 *\li	For isc_socket_recv2():
 *	The only defined value for 'flags' is ISC_SOCKFLAG_IMMEDIATE.  If
 *	set and the operation completes, the return value will be
 *	ISC_R_SUCCESS and the event will be filled in and not sent.  If the
 *	operation does not complete, the return value will be
 *	ISC_R_INPROGRESS and the event will be sent when the operation
 *	completes.
 *
 * Requires:
 *
 *\li	'socket' is a valid, bound socket.
 *
 *\li	For isc_socket_recv():
 *	'region' is a valid region
 *
 *\li	For isc_socket_recvv():
 *	'buflist' is non-NULL, and '*buflist' contain at least one buffer.
 *
 *\li	'task' is a valid task
 *
 *\li	For isc_socket_recv() and isc_socket_recvv():
 *	action != NULL and is a valid action
 *
 *\li	For isc_socket_recv2():
 *	event != NULL
 *
 * Returns:
 *
 *\li	#ISC_R_SUCCESS
 *\li	#ISC_R_INPROGRESS
 *\li	#ISC_R_NOMEMORY
 *\li	#ISC_R_UNEXPECTED
 *
 * Event results:
 *
 *\li	#ISC_R_SUCCESS
 *\li	#ISC_R_UNEXPECTED
 *\li	XXX needs other net-type errors
 */
/*@}*/

/*@{*/
isc_result_t
isc_socket_send(isc_socket_t *sock, isc_region_t *region,
		isc_task_t *task, isc_taskaction_t action, const void *arg);
isc_result_t
isc_socket_sendto(isc_socket_t *sock, isc_region_t *region,
		  isc_task_t *task, isc_taskaction_t action, const void *arg,
		  isc_sockaddr_t *address, struct in6_pktinfo *pktinfo);
isc_result_t
isc_socket_sendv(isc_socket_t *sock, isc_bufferlist_t *buflist,
		 isc_task_t *task, isc_taskaction_t action, const void *arg);
isc_result_t
isc_socket_sendtov(isc_socket_t *sock, isc_bufferlist_t *buflist,
		   isc_task_t *task, isc_taskaction_t action, const void *arg,
		   isc_sockaddr_t *address, struct in6_pktinfo *pktinfo);
isc_result_t
isc_socket_sendtov2(isc_socket_t *sock, isc_bufferlist_t *buflist,
		    isc_task_t *task, isc_taskaction_t action, const void *arg,
		    isc_sockaddr_t *address, struct in6_pktinfo *pktinfo,
		    unsigned int flags);
isc_result_t
isc_socket_sendto2(isc_socket_t *sock, isc_region_t *region,
		   isc_task_t *task,
		   isc_sockaddr_t *address, struct in6_pktinfo *pktinfo,
		   isc_socketevent_t *event, unsigned int flags);

/*!
 * Send the contents of 'region' to the socket's peer.
 *
 * Notes:
 *
 *\li	Shutting down the requestor's task *may* result in any
 *	still pending writes being dropped or completed, depending on the
 *	underlying OS implementation.
 *
 *\li	If 'action' is NULL, then no completion event will be posted.
 *
 *\li	The caller may not modify 'region', the buffers which are passed
 *	into this function, or any data they refer to until the completion
 *	event is received.
 *
 *\li	For isc_socket_sendv() and isc_socket_sendtov():
 *	On successful completion, '*buflist' will be empty, and the list of
 *	all buffers will be returned in the done event's 'bufferlist'
 *	member.  On error return, '*buflist' will be unchanged.
 *
 *\li	For isc_socket_sendto2():
 *	'event' is not NULL, and the non-socket specific fields are
 *	expected to be initialized.
 *
 *\li	For isc_socket_sendto2():
 *	The only defined values for 'flags' are ISC_SOCKFLAG_IMMEDIATE
 *	and ISC_SOCKFLAG_NORETRY.
 *
 *\li	If ISC_SOCKFLAG_IMMEDIATE is set and the operation completes, the
 *	return value will be ISC_R_SUCCESS and the event will be filled
 *	in and not sent.  If the operation does not complete, the return
 *	value will be ISC_R_INPROGRESS and the event will be sent when
 *	the operation completes.
 *
 *\li	ISC_SOCKFLAG_NORETRY can only be set for UDP sockets.  If set
 *	and the send operation fails due to a transient error, the send
 *	will not be retried and the error will be indicated in the event.
 *	Using this option along with ISC_SOCKFLAG_IMMEDIATE allows the caller
 *	to specify a region that is allocated on the stack.
 *
 * Requires:
 *
 *\li	'socket' is a valid, bound socket.
 *
 *\li	For isc_socket_send():
 *	'region' is a valid region
 *
 *\li	For isc_socket_sendv() and isc_socket_sendtov():
 *	'buflist' is non-NULL, and '*buflist' contain at least one buffer.
 *
 *\li	'task' is a valid task
 *
 *\li	For isc_socket_sendv(), isc_socket_sendtov(), isc_socket_send(), and
 *	isc_socket_sendto():
 *	action == NULL or is a valid action
 *
 *\li	For isc_socket_sendto2():
 *	event != NULL
 *
 * Returns:
 *
 *\li	#ISC_R_SUCCESS
 *\li	#ISC_R_INPROGRESS
 *\li	#ISC_R_NOMEMORY
 *\li	#ISC_R_UNEXPECTED
 *
 * Event results:
 *
 *\li	#ISC_R_SUCCESS
 *\li	#ISC_R_UNEXPECTED
 *\li	XXX needs other net-type errors
 */
/*@}*/

isc_result_t
isc_socketmgr_createinctx(isc_mem_t *mctx, isc_appctx_t *actx,
			  isc_socketmgr_t **managerp);

isc_result_t
isc_socketmgr_create(isc_mem_t *mctx, isc_socketmgr_t **managerp);

isc_result_t
isc_socketmgr_create2(isc_mem_t *mctx, isc_socketmgr_t **managerp,
		      unsigned int maxsocks);
/*%<
 * Create a socket manager.  If "maxsocks" is non-zero, it specifies the
 * maximum number of sockets that the created manager should handle.
 * isc_socketmgr_create() is equivalent of isc_socketmgr_create2() with
 * "maxsocks" being zero.
 * isc_socketmgr_createinctx() also associates the new manager with the
 * specified application context.
 *
 * Notes:
 *
 *\li	All memory will be allocated in memory context 'mctx'.
 *
 * Requires:
 *
 *\li	'mctx' is a valid memory context.
 *
 *\li	'managerp' points to a NULL isc_socketmgr_t.
 *
 *\li	'actx' is a valid application context (for createinctx()).
 *
 * Ensures:
 *
 *\li	'*managerp' is a valid isc_socketmgr_t.
 *
 * Returns:
 *
 *\li	#ISC_R_SUCCESS
 *\li	#ISC_R_NOMEMORY
 *\li	#ISC_R_UNEXPECTED
 *\li	#ISC_R_NOTIMPLEMENTED
 */

isc_result_t
isc_socketmgr_getmaxsockets(isc_socketmgr_t *manager, unsigned int *nsockp);
/*%<
 * Returns in "*nsockp" the maximum number of sockets this manager may open.
 *
 * Requires:
 *
 *\li	'*manager' is a valid isc_socketmgr_t.
 *\li	'nsockp' is not NULL.
 *
 * Returns:
 *
 *\li	#ISC_R_SUCCESS
 *\li	#ISC_R_NOTIMPLEMENTED
 */

void
isc_socketmgr_setstats(isc_socketmgr_t *manager, isc_stats_t *stats);
/*%<
 * Set a general socket statistics counter set 'stats' for 'manager'.
 *
 * Requires:
 * \li	'manager' is valid, hasn't opened any socket, and doesn't have
 *	stats already set.
 *
 *\li	stats is a valid statistics supporting socket statistics counters
 *	(see above).
 */

void
isc_socketmgr_destroy(isc_socketmgr_t **managerp);
/*%<
 * Destroy a socket manager.
 *
 * Notes:
 *
 *\li	This routine blocks until there are no sockets left in the manager,
 *	so if the caller holds any socket references using the manager, it
 *	must detach them before calling isc_socketmgr_destroy() or it will
 *	block forever.
 *
 * Requires:
 *
 *\li	'*managerp' is a valid isc_socketmgr_t.
 *
 *\li	All sockets managed by this manager are fully detached.
 *
 * Ensures:
 *
 *\li	*managerp == NULL
 *
 *\li	All resources used by the manager have been freed.
 */

isc_sockettype_t
isc_socket_gettype(isc_socket_t *sock);
/*%<
 * Returns the socket type for "sock."
 *
 * Requires:
 *
 *\li	"sock" is a valid socket.
 */

/*@{*/
isc_boolean_t
isc_socket_isbound(isc_socket_t *sock);

void
isc_socket_ipv6only(isc_socket_t *sock, isc_boolean_t yes);
/*%<
 * If the socket is an IPv6 socket set/clear the IPV6_IPV6ONLY socket
 * option if the host OS supports this option.
 *
 * Requires:
 *\li	'sock' is a valid socket.
 */
/*@}*/

void
isc_socket_cleanunix(isc_sockaddr_t *addr, isc_boolean_t active);

/*%<
 * Cleanup UNIX domain sockets in the file-system.  If 'active' is true
 * then just unlink the socket.  If 'active' is false try to determine
 * if there is a listener of the socket or not.  If no listener is found
 * then unlink socket.
 *
 * Prior to unlinking the path is tested to see if it a socket.
 *
 * Note: there are a number of race conditions which cannot be avoided
 *       both in the filesystem and any application using UNIX domain
 *	 sockets (e.g. socket is tested between bind() and listen(),
 *	 the socket is deleted and replaced in the file-system between
 *	 stat() and unlink()).
 */

isc_result_t
isc_socket_permunix(isc_sockaddr_t *sockaddr, isc_uint32_t perm,
		    isc_uint32_t owner, isc_uint32_t group);
/*%<
 * Set ownership and file permissions on the UNIX domain socket.
 *
 * Note: On Solaris and SunOS this secures the directory containing
 *       the socket as Solaris and SunOS do not honour the filesystem
 *	 permissions on the socket.
 *
 * Requires:
 * \li	'sockaddr' to be a valid UNIX domain sockaddr.
 *
 * Returns:
 * \li	#ISC_R_SUCCESS
 * \li	#ISC_R_FAILURE
 */

void isc_socket_setname(isc_socket_t *socket, const char *name, void *tag);
/*%<
 * Set the name and optional tag for a socket.  This allows tracking of the
 * owner or purpose for this socket, and is useful for tracing and statistics
 * reporting.
 */

const char *isc_socket_getname(isc_socket_t *socket);
/*%<
 * Get the name associated with a socket, if any.
 */

void *isc_socket_gettag(isc_socket_t *socket);
/*%<
 * Get the tag associated with a socket, if any.
 */

void
isc__socketmgr_setreserved(isc_socketmgr_t *mgr, isc_uint32_t);
/*%<
 * Temporary.  For use by named only.
 */

void
isc__socketmgr_maxudp(isc_socketmgr_t *mgr, int maxudp);
/*%<
 * Test interface. Drop UDP packet > 'maxudp'.
 */

#ifdef HAVE_LIBXML2

void
isc_socketmgr_renderxml(isc_socketmgr_t *mgr, xmlTextWriterPtr writer);
/*%<
 * Render internal statistics and other state into the XML document.
 */

#endif /* HAVE_LIBXML2 */

#ifdef USE_SOCKETIMPREGISTER
/*%<
 * See isc_socketmgr_create() above.
 */
typedef isc_result_t
(*isc_socketmgrcreatefunc_t)(isc_mem_t *mctx, isc_socketmgr_t **managerp);

isc_result_t
isc_socket_register(isc_socketmgrcreatefunc_t createfunc);
/*%<
 * Register a new socket I/O implementation and add it to the list of
 * supported implementations.  This function must be called when a different
 * event library is used than the one contained in the ISC library.
 */

isc_result_t
isc__socket_register(void);
/*%<
 * A short cut function that specifies the socket I/O module in the ISC
 * library for isc_socket_register().  An application that uses the ISC library
 * usually do not have to care about this function: it would call
 * isc_lib_register(), which internally calls this function.
 */
#endif /* USE_SOCKETIMPREGISTER */

ISC_LANG_ENDDECLS

#endif /* ISC_SOCKET_H */

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