socket.h

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 *
 * \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_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_create(isc_mem_t *mctx, isc_socketmgr_t **managerp);
/*%<
 * Create a socket manager.
 *
 * 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.
 *
 * Ensures:
 *
 *\li	'*managerp' is a valid isc_socketmgr_t.
 *
 * Returns:
 *
 *\li	#ISC_R_SUCCESS
 *\li	#ISC_R_NOMEMORY
 *\li	#ISC_R_UNEXPECTED
 */

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 filesytem
 *	 permissions on the socket.
 *
 * Requires:
 * \li	'sockaddr' to be a valid UNIX domain sockaddr.
 *
 * Returns:
 * \li	#ISC_R_SUCCESS
 * \li	#ISC_R_FAILURE
 */

ISC_LANG_ENDDECLS

#endif /* ISC_SOCKET_H */