2 * Copyright (C) 2004-2009, 2011, 2012 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1998-2002 Internet Software Consortium.
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15 * PERFORMANCE OF THIS SOFTWARE.
21 #define ISC_SOCKET_H 1
27 /*! \file isc/socket.h
28 * \brief Provides TCP and UDP sockets for network I/O. The sockets are event
29 * sources in the task system.
31 * When I/O completes, a completion event for the socket is posted to the
32 * event queue of the task which requested the I/O.
35 * The module ensures appropriate synchronization of data structures it
36 * creates and manipulates.
37 * Clients of this module must not be holding a socket's task's lock when
38 * making a call that affects that socket. Failure to follow this rule
39 * can result in deadlock.
40 * The caller must ensure that isc_socketmgr_destroy() is called only
41 * once for a given manager.
44 * No anticipated impact.
50 * No anticipated impact.
61 #include <isc/types.h>
62 #include <isc/event.h>
63 #include <isc/eventclass.h>
65 #include <isc/region.h>
66 #include <isc/sockaddr.h>
76 * Maximum number of buffers in a scatter/gather read/write. The operating
77 * system in use must support at least this number (plus one on some.)
79 #define ISC_SOCKET_MAXSCATTERGATHER 8
82 * In isc_socket_bind() set socket option SO_REUSEADDR prior to calling
83 * bind() if a non zero port is specified (AF_INET and AF_INET6).
85 #define ISC_SOCKET_REUSEADDRESS 0x01U
88 * Statistics counters. Used as isc_statscounter_t values.
91 isc_sockstatscounter_udp4open = 0,
92 isc_sockstatscounter_udp6open = 1,
93 isc_sockstatscounter_tcp4open = 2,
94 isc_sockstatscounter_tcp6open = 3,
95 isc_sockstatscounter_unixopen = 4,
97 isc_sockstatscounter_udp4openfail = 5,
98 isc_sockstatscounter_udp6openfail = 6,
99 isc_sockstatscounter_tcp4openfail = 7,
100 isc_sockstatscounter_tcp6openfail = 8,
101 isc_sockstatscounter_unixopenfail = 9,
103 isc_sockstatscounter_udp4close = 10,
104 isc_sockstatscounter_udp6close = 11,
105 isc_sockstatscounter_tcp4close = 12,
106 isc_sockstatscounter_tcp6close = 13,
107 isc_sockstatscounter_unixclose = 14,
108 isc_sockstatscounter_fdwatchclose = 15,
110 isc_sockstatscounter_udp4bindfail = 16,
111 isc_sockstatscounter_udp6bindfail = 17,
112 isc_sockstatscounter_tcp4bindfail = 18,
113 isc_sockstatscounter_tcp6bindfail = 19,
114 isc_sockstatscounter_unixbindfail = 20,
115 isc_sockstatscounter_fdwatchbindfail = 21,
117 isc_sockstatscounter_udp4connect = 22,
118 isc_sockstatscounter_udp6connect = 23,
119 isc_sockstatscounter_tcp4connect = 24,
120 isc_sockstatscounter_tcp6connect = 25,
121 isc_sockstatscounter_unixconnect = 26,
122 isc_sockstatscounter_fdwatchconnect = 27,
124 isc_sockstatscounter_udp4connectfail = 28,
125 isc_sockstatscounter_udp6connectfail = 29,
126 isc_sockstatscounter_tcp4connectfail = 30,
127 isc_sockstatscounter_tcp6connectfail = 31,
128 isc_sockstatscounter_unixconnectfail = 32,
129 isc_sockstatscounter_fdwatchconnectfail = 33,
131 isc_sockstatscounter_tcp4accept = 34,
132 isc_sockstatscounter_tcp6accept = 35,
133 isc_sockstatscounter_unixaccept = 36,
135 isc_sockstatscounter_tcp4acceptfail = 37,
136 isc_sockstatscounter_tcp6acceptfail = 38,
137 isc_sockstatscounter_unixacceptfail = 39,
139 isc_sockstatscounter_udp4sendfail = 40,
140 isc_sockstatscounter_udp6sendfail = 41,
141 isc_sockstatscounter_tcp4sendfail = 42,
142 isc_sockstatscounter_tcp6sendfail = 43,
143 isc_sockstatscounter_unixsendfail = 44,
144 isc_sockstatscounter_fdwatchsendfail = 45,
146 isc_sockstatscounter_udp4recvfail = 46,
147 isc_sockstatscounter_udp6recvfail = 47,
148 isc_sockstatscounter_tcp4recvfail = 48,
149 isc_sockstatscounter_tcp6recvfail = 49,
150 isc_sockstatscounter_unixrecvfail = 50,
151 isc_sockstatscounter_fdwatchrecvfail = 51,
153 isc_sockstatscounter_max = 52
160 struct isc_socketevent {
161 ISC_EVENT_COMMON(isc_socketevent_t);
162 isc_result_t result; /*%< OK, EOF, whatever else */
163 unsigned int minimum; /*%< minimum i/o for event */
164 unsigned int n; /*%< bytes read or written */
165 unsigned int offset; /*%< offset into buffer list */
166 isc_region_t region; /*%< for single-buffer i/o */
167 isc_bufferlist_t bufferlist; /*%< list of buffers */
168 isc_sockaddr_t address; /*%< source address */
169 isc_time_t timestamp; /*%< timestamp of packet recv */
170 struct in6_pktinfo pktinfo; /*%< ipv6 pktinfo */
171 isc_uint32_t attributes; /*%< see below */
172 isc_eventdestructor_t destroy; /*%< original destructor */
175 typedef struct isc_socket_newconnev isc_socket_newconnev_t;
176 struct isc_socket_newconnev {
177 ISC_EVENT_COMMON(isc_socket_newconnev_t);
178 isc_socket_t * newsocket;
179 isc_result_t result; /*%< OK, EOF, whatever else */
180 isc_sockaddr_t address; /*%< source address */
183 typedef struct isc_socket_connev isc_socket_connev_t;
184 struct isc_socket_connev {
185 ISC_EVENT_COMMON(isc_socket_connev_t);
186 isc_result_t result; /*%< OK, EOF, whatever else */
191 * _ATTACHED: Internal use only.
192 * _TRUNC: Packet was truncated on receive.
193 * _CTRUNC: Packet control information was truncated. This can
194 * indicate that the packet is not complete, even though
195 * all the data is valid.
196 * _TIMESTAMP: The timestamp member is valid.
197 * _PKTINFO: The pktinfo member is valid.
198 * _MULTICAST: The UDP packet was received via a multicast transmission.
200 #define ISC_SOCKEVENTATTR_ATTACHED 0x80000000U /* internal */
201 #define ISC_SOCKEVENTATTR_TRUNC 0x00800000U /* public */
202 #define ISC_SOCKEVENTATTR_CTRUNC 0x00400000U /* public */
203 #define ISC_SOCKEVENTATTR_TIMESTAMP 0x00200000U /* public */
204 #define ISC_SOCKEVENTATTR_PKTINFO 0x00100000U /* public */
205 #define ISC_SOCKEVENTATTR_MULTICAST 0x00080000U /* public */
208 #define ISC_SOCKEVENT_ANYEVENT (0)
209 #define ISC_SOCKEVENT_RECVDONE (ISC_EVENTCLASS_SOCKET + 1)
210 #define ISC_SOCKEVENT_SENDDONE (ISC_EVENTCLASS_SOCKET + 2)
211 #define ISC_SOCKEVENT_NEWCONN (ISC_EVENTCLASS_SOCKET + 3)
212 #define ISC_SOCKEVENT_CONNECT (ISC_EVENTCLASS_SOCKET + 4)
217 #define ISC_SOCKEVENT_INTR (ISC_EVENTCLASS_SOCKET + 256)
218 #define ISC_SOCKEVENT_INTW (ISC_EVENTCLASS_SOCKET + 257)
221 isc_sockettype_udp = 1,
222 isc_sockettype_tcp = 2,
223 isc_sockettype_unix = 3,
224 isc_sockettype_fdwatch = 4
229 * How a socket should be shutdown in isc_socket_shutdown() calls.
231 #define ISC_SOCKSHUT_RECV 0x00000001 /*%< close read side */
232 #define ISC_SOCKSHUT_SEND 0x00000002 /*%< close write side */
233 #define ISC_SOCKSHUT_ALL 0x00000003 /*%< close them all */
238 * What I/O events to cancel in isc_socket_cancel() calls.
240 #define ISC_SOCKCANCEL_RECV 0x00000001 /*%< cancel recv */
241 #define ISC_SOCKCANCEL_SEND 0x00000002 /*%< cancel send */
242 #define ISC_SOCKCANCEL_ACCEPT 0x00000004 /*%< cancel accept */
243 #define ISC_SOCKCANCEL_CONNECT 0x00000008 /*%< cancel connect */
244 #define ISC_SOCKCANCEL_ALL 0x0000000f /*%< cancel everything */
249 * Flags for isc_socket_send() and isc_socket_recv() calls.
251 #define ISC_SOCKFLAG_IMMEDIATE 0x00000001 /*%< send event only if needed */
252 #define ISC_SOCKFLAG_NORETRY 0x00000002 /*%< drop failed UDP sends */
257 * Flags for fdwatchcreate.
259 #define ISC_SOCKFDWATCH_READ 0x00000001 /*%< watch for readable */
260 #define ISC_SOCKFDWATCH_WRITE 0x00000002 /*%< watch for writable */
263 /*% Socket and socket manager methods */
264 typedef struct isc_socketmgrmethods {
265 void (*destroy)(isc_socketmgr_t **managerp);
266 isc_result_t (*socketcreate)(isc_socketmgr_t *manager, int pf,
267 isc_sockettype_t type,
268 isc_socket_t **socketp);
269 isc_result_t (*fdwatchcreate)(isc_socketmgr_t *manager, int fd,
271 isc_sockfdwatch_t callback,
272 void *cbarg, isc_task_t *task,
273 isc_socket_t **socketp);
274 } isc_socketmgrmethods_t;
276 typedef struct isc_socketmethods {
277 void (*attach)(isc_socket_t *sock,
278 isc_socket_t **socketp);
279 void (*detach)(isc_socket_t **socketp);
280 isc_result_t (*bind)(isc_socket_t *sock, isc_sockaddr_t *sockaddr,
281 unsigned int options);
282 isc_result_t (*sendto)(isc_socket_t *sock, isc_region_t *region,
283 isc_task_t *task, isc_taskaction_t action,
284 const void *arg, isc_sockaddr_t *address,
285 struct in6_pktinfo *pktinfo);
286 isc_result_t (*connect)(isc_socket_t *sock, isc_sockaddr_t *addr,
287 isc_task_t *task, isc_taskaction_t action,
289 isc_result_t (*recv)(isc_socket_t *sock, isc_region_t *region,
290 unsigned int minimum, isc_task_t *task,
291 isc_taskaction_t action, const void *arg);
292 void (*cancel)(isc_socket_t *sock, isc_task_t *task,
294 isc_result_t (*getsockname)(isc_socket_t *sock,
295 isc_sockaddr_t *addressp);
296 isc_sockettype_t (*gettype)(isc_socket_t *sock);
297 void (*ipv6only)(isc_socket_t *sock, isc_boolean_t yes);
298 isc_result_t (*fdwatchpoke)(isc_socket_t *sock, int flags);
299 isc_result_t (*dup)(isc_socket_t *sock,
300 isc_socket_t **socketp);
301 int (*getfd)(isc_socket_t *sock);
302 } isc_socketmethods_t;
305 * This structure is actually just the common prefix of a socket manager
306 * object implementation's version of an isc_socketmgr_t.
308 * Direct use of this structure by clients is forbidden. socket implementations
309 * may change the structure. 'magic' must be ISCAPI_SOCKETMGR_MAGIC for any
310 * of the isc_socket_ routines to work. socket implementations must maintain
311 * all socket invariants.
312 * In effect, this definition is used only for non-BIND9 version ("export")
313 * of the library, and the export version does not work for win32. So, to avoid
314 * the definition conflict with win32/socket.c, we enable this definition only
315 * for non-Win32 (i.e. Unix) platforms.
318 struct isc_socketmgr {
319 unsigned int impmagic;
321 isc_socketmgrmethods_t *methods;
325 #define ISCAPI_SOCKETMGR_MAGIC ISC_MAGIC('A','s','m','g')
326 #define ISCAPI_SOCKETMGR_VALID(m) ((m) != NULL && \
327 (m)->magic == ISCAPI_SOCKETMGR_MAGIC)
330 * This is the common prefix of a socket object. The same note as
331 * that for the socketmgr structure applies.
335 unsigned int impmagic;
337 isc_socketmethods_t *methods;
341 #define ISCAPI_SOCKET_MAGIC ISC_MAGIC('A','s','c','t')
342 #define ISCAPI_SOCKET_VALID(s) ((s) != NULL && \
343 (s)->magic == ISCAPI_SOCKET_MAGIC)
346 *** Socket and Socket Manager Functions
348 *** Note: all Ensures conditions apply only if the result is success for
349 *** those functions which return an isc_result.
353 isc_socket_fdwatchcreate(isc_socketmgr_t *manager,
356 isc_sockfdwatch_t callback,
359 isc_socket_t **socketp);
361 * Create a new file descriptor watch socket managed by 'manager'.
365 *\li 'fd' is the already-opened file descriptor.
366 *\li This function is not available on Windows.
367 *\li The callback function is called "in-line" - this means the function
368 * needs to return as fast as possible, as all other I/O will be suspended
369 * until the callback completes.
373 *\li 'manager' is a valid manager
375 *\li 'socketp' is a valid pointer, and *socketp == NULL
381 * '*socketp' is attached to the newly created fdwatch socket
387 *\li #ISC_R_NORESOURCES
388 *\li #ISC_R_UNEXPECTED
392 isc_socket_fdwatchpoke(isc_socket_t *sock,
395 * Poke a file descriptor watch socket informing the manager that it
396 * should restart watching the socket
400 *\li 'sock' is the socket returned by isc_socket_fdwatchcreate
402 *\li 'flags' indicates what the manager should watch for on the socket
403 * in addition to what it may already be watching. It can be one or
404 * both of ISC_SOCKFDWATCH_READ and ISC_SOCKFDWATCH_WRITE. To
405 * temporarily disable watching on a socket the value indicating
406 * no more data should be returned from the call back routine.
408 *\li This function is not available on Windows.
412 *\li 'sock' is a valid isc socket
421 isc_socket_create(isc_socketmgr_t *manager,
423 isc_sockettype_t type,
424 isc_socket_t **socketp);
426 * Create a new 'type' socket managed by 'manager'.
428 * For isc_sockettype_fdwatch sockets you should use isc_socket_fdwatchcreate()
429 * rather than isc_socket_create().
433 *\li 'pf' is the desired protocol family, e.g. PF_INET or PF_INET6.
437 *\li 'manager' is a valid manager
439 *\li 'socketp' is a valid pointer, and *socketp == NULL
441 *\li 'type' is not isc_sockettype_fdwatch
445 * '*socketp' is attached to the newly created socket
451 *\li #ISC_R_NORESOURCES
452 *\li #ISC_R_UNEXPECTED
456 isc_socket_dup(isc_socket_t *sock0, isc_socket_t **socketp);
458 * Duplicate an existing socket, reusing its file descriptor.
462 isc_socket_cancel(isc_socket_t *sock, isc_task_t *task,
465 * Cancel pending I/O of the type specified by "how".
467 * Note: if "task" is NULL, then the cancel applies to all tasks using the
472 * \li "socket" is a valid socket
474 * \li "task" is NULL or a valid task
476 * "how" is a bitmask describing the type of cancelation to perform.
477 * The type ISC_SOCKCANCEL_ALL will cancel all pending I/O on this
480 * \li ISC_SOCKCANCEL_RECV:
481 * Cancel pending isc_socket_recv() calls.
483 * \li ISC_SOCKCANCEL_SEND:
484 * Cancel pending isc_socket_send() and isc_socket_sendto() calls.
486 * \li ISC_SOCKCANCEL_ACCEPT:
487 * Cancel pending isc_socket_accept() calls.
489 * \li ISC_SOCKCANCEL_CONNECT:
490 * Cancel pending isc_socket_connect() call.
494 isc_socket_shutdown(isc_socket_t *sock, unsigned int how);
496 * Shutdown 'socket' according to 'how'.
500 * \li 'socket' is a valid socket.
502 * \li 'task' is NULL or is a valid task.
504 * \li If 'how' is 'ISC_SOCKSHUT_RECV' or 'ISC_SOCKSHUT_ALL' then
506 * The read queue must be empty.
508 * No further read requests may be made.
510 * \li If 'how' is 'ISC_SOCKSHUT_SEND' or 'ISC_SOCKSHUT_ALL' then
512 * The write queue must be empty.
514 * No further write requests may be made.
518 isc_socket_attach(isc_socket_t *sock, isc_socket_t **socketp);
520 * Attach *socketp to socket.
524 * \li 'socket' is a valid socket.
526 * \li 'socketp' points to a NULL socket.
530 * \li *socketp is attached to socket.
534 isc_socket_detach(isc_socket_t **socketp);
536 * Detach *socketp from its socket.
540 * \li 'socketp' points to a valid socket.
542 * \li If '*socketp' is the last reference to the socket,
545 * There must be no pending I/O requests.
549 * \li *socketp is NULL.
551 * \li If '*socketp' is the last reference to the socket,
554 * The socket will be shutdown (both reading and writing)
557 * All resources used by the socket have been freed
561 isc_socket_open(isc_socket_t *sock);
563 * Open a new socket file descriptor of the given socket structure. It simply
564 * opens a new descriptor; all of the other parameters including the socket
565 * type are inherited from the existing socket. This function is provided to
566 * avoid overhead of destroying and creating sockets when many short-lived
567 * sockets are frequently opened and closed. When the efficiency is not an
568 * issue, it should be safer to detach the unused socket and re-create a new
569 * one. This optimization may not be available for some systems, in which
570 * case this function will return ISC_R_NOTIMPLEMENTED and must not be used.
572 * isc_socket_open() should not be called on sockets created by
573 * isc_socket_fdwatchcreate().
577 * \li there must be no other reference to this socket.
579 * \li 'socket' is a valid and previously closed by isc_socket_close()
581 * \li 'sock->type' is not isc_sockettype_fdwatch
584 * Same as isc_socket_create().
585 * \li ISC_R_NOTIMPLEMENTED
589 isc_socket_close(isc_socket_t *sock);
591 * Close a socket file descriptor of the given socket structure. This function
592 * is provided as an alternative to destroying an unused socket when overhead
593 * destroying/re-creating sockets can be significant, and is expected to be
594 * used with isc_socket_open(). This optimization may not be available for some
595 * systems, in which case this function will return ISC_R_NOTIMPLEMENTED and
598 * isc_socket_close() should not be called on sockets created by
599 * isc_socket_fdwatchcreate().
603 * \li The socket must have a valid descriptor.
605 * \li There must be no other reference to this socket.
607 * \li There must be no pending I/O requests.
609 * \li 'sock->type' is not isc_sockettype_fdwatch
612 * \li #ISC_R_NOTIMPLEMENTED
616 isc_socket_bind(isc_socket_t *sock, isc_sockaddr_t *addressp,
617 unsigned int options);
619 * Bind 'socket' to '*addressp'.
623 * \li 'socket' is a valid socket
625 * \li 'addressp' points to a valid isc_sockaddr.
631 * \li ISC_R_ADDRNOTAVAIL
632 * \li ISC_R_ADDRINUSE
634 * \li ISC_R_UNEXPECTED
638 isc_socket_filter(isc_socket_t *sock, const char *filter);
640 * Inform the kernel that it should perform accept filtering.
641 * If filter is NULL the current filter will be removed.:w
645 isc_socket_listen(isc_socket_t *sock, unsigned int backlog);
647 * Set listen mode on the socket. After this call, the only function that
648 * can be used (other than attach and detach) is isc_socket_accept().
652 * \li 'backlog' is as in the UNIX system call listen() and may be
653 * ignored by non-UNIX implementations.
655 * \li If 'backlog' is zero, a reasonable system default is used, usually
660 * \li 'socket' is a valid, bound TCP socket or a valid, bound UNIX socket.
665 * \li ISC_R_UNEXPECTED
669 isc_socket_accept(isc_socket_t *sock,
670 isc_task_t *task, isc_taskaction_t action, const void *arg);
672 * Queue accept event. When a new connection is received, the task will
673 * get an ISC_SOCKEVENT_NEWCONN event with the sender set to the listen
674 * socket. The new socket structure is sent inside the isc_socket_newconnev_t
675 * event type, and is attached to the task 'task'.
678 * \li 'socket' is a valid TCP socket that isc_socket_listen() was called
681 * \li 'task' is a valid task
683 * \li 'action' is a valid action
688 * \li ISC_R_UNEXPECTED
692 isc_socket_connect(isc_socket_t *sock, isc_sockaddr_t *addressp,
693 isc_task_t *task, isc_taskaction_t action,
696 * Connect 'socket' to peer with address *saddr. When the connection
697 * succeeds, or when an error occurs, a CONNECT event with action 'action'
698 * and arg 'arg' will be posted to the event queue for 'task'.
702 * \li 'socket' is a valid TCP socket
704 * \li 'addressp' points to a valid isc_sockaddr
706 * \li 'task' is a valid task
708 * \li 'action' is a valid action
714 * \li ISC_R_UNEXPECTED
716 * Posted event's result code:
720 * \li ISC_R_CONNREFUSED
721 * \li ISC_R_NETUNREACH
722 * \li ISC_R_UNEXPECTED
726 isc_socket_getpeername(isc_socket_t *sock, isc_sockaddr_t *addressp);
728 * Get the name of the peer connected to 'socket'.
732 * \li 'socket' is a valid TCP socket.
738 * \li ISC_R_UNEXPECTED
742 isc_socket_getsockname(isc_socket_t *sock, isc_sockaddr_t *addressp);
744 * Get the name of 'socket'.
748 * \li 'socket' is a valid socket.
754 * \li ISC_R_UNEXPECTED
759 isc_socket_recv(isc_socket_t *sock, isc_region_t *region,
760 unsigned int minimum,
761 isc_task_t *task, isc_taskaction_t action, const void *arg);
763 isc_socket_recvv(isc_socket_t *sock, isc_bufferlist_t *buflist,
764 unsigned int minimum,
765 isc_task_t *task, isc_taskaction_t action, const void *arg);
768 isc_socket_recv2(isc_socket_t *sock, isc_region_t *region,
769 unsigned int minimum, isc_task_t *task,
770 isc_socketevent_t *event, unsigned int flags);
773 * Receive from 'socket', storing the results in region.
777 *\li Let 'length' refer to the length of 'region' or to the sum of all
778 * available regions in the list of buffers '*buflist'.
780 *\li If 'minimum' is non-zero and at least that many bytes are read,
781 * the completion event will be posted to the task 'task.' If minimum
782 * is zero, the exact number of bytes requested in the region must
783 * be read for an event to be posted. This only makes sense for TCP
784 * connections, and is always set to 1 byte for UDP.
786 *\li The read will complete when the desired number of bytes have been
787 * read, if end-of-input occurs, or if an error occurs. A read done
788 * event with the given 'action' and 'arg' will be posted to the
789 * event queue of 'task'.
791 *\li The caller may not modify 'region', the buffers which are passed
792 * into this function, or any data they refer to until the completion
795 *\li For isc_socket_recvv():
796 * On successful completion, '*buflist' will be empty, and the list of
797 * all buffers will be returned in the done event's 'bufferlist'
798 * member. On error return, '*buflist' will be unchanged.
800 *\li For isc_socket_recv2():
801 * 'event' is not NULL, and the non-socket specific fields are
802 * expected to be initialized.
804 *\li For isc_socket_recv2():
805 * The only defined value for 'flags' is ISC_SOCKFLAG_IMMEDIATE. If
806 * set and the operation completes, the return value will be
807 * ISC_R_SUCCESS and the event will be filled in and not sent. If the
808 * operation does not complete, the return value will be
809 * ISC_R_INPROGRESS and the event will be sent when the operation
814 *\li 'socket' is a valid, bound socket.
816 *\li For isc_socket_recv():
817 * 'region' is a valid region
819 *\li For isc_socket_recvv():
820 * 'buflist' is non-NULL, and '*buflist' contain at least one buffer.
822 *\li 'task' is a valid task
824 *\li For isc_socket_recv() and isc_socket_recvv():
825 * action != NULL and is a valid action
827 *\li For isc_socket_recv2():
833 *\li #ISC_R_INPROGRESS
835 *\li #ISC_R_UNEXPECTED
840 *\li #ISC_R_UNEXPECTED
841 *\li XXX needs other net-type errors
847 isc_socket_send(isc_socket_t *sock, isc_region_t *region,
848 isc_task_t *task, isc_taskaction_t action, const void *arg);
850 isc_socket_sendto(isc_socket_t *sock, isc_region_t *region,
851 isc_task_t *task, isc_taskaction_t action, const void *arg,
852 isc_sockaddr_t *address, struct in6_pktinfo *pktinfo);
854 isc_socket_sendv(isc_socket_t *sock, isc_bufferlist_t *buflist,
855 isc_task_t *task, isc_taskaction_t action, const void *arg);
857 isc_socket_sendtov(isc_socket_t *sock, isc_bufferlist_t *buflist,
858 isc_task_t *task, isc_taskaction_t action, const void *arg,
859 isc_sockaddr_t *address, struct in6_pktinfo *pktinfo);
861 isc_socket_sendto2(isc_socket_t *sock, isc_region_t *region,
863 isc_sockaddr_t *address, struct in6_pktinfo *pktinfo,
864 isc_socketevent_t *event, unsigned int flags);
867 * Send the contents of 'region' to the socket's peer.
871 *\li Shutting down the requestor's task *may* result in any
872 * still pending writes being dropped or completed, depending on the
873 * underlying OS implementation.
875 *\li If 'action' is NULL, then no completion event will be posted.
877 *\li The caller may not modify 'region', the buffers which are passed
878 * into this function, or any data they refer to until the completion
881 *\li For isc_socket_sendv() and isc_socket_sendtov():
882 * On successful completion, '*buflist' will be empty, and the list of
883 * all buffers will be returned in the done event's 'bufferlist'
884 * member. On error return, '*buflist' will be unchanged.
886 *\li For isc_socket_sendto2():
887 * 'event' is not NULL, and the non-socket specific fields are
888 * expected to be initialized.
890 *\li For isc_socket_sendto2():
891 * The only defined values for 'flags' are ISC_SOCKFLAG_IMMEDIATE
892 * and ISC_SOCKFLAG_NORETRY.
894 *\li If ISC_SOCKFLAG_IMMEDIATE is set and the operation completes, the
895 * return value will be ISC_R_SUCCESS and the event will be filled
896 * in and not sent. If the operation does not complete, the return
897 * value will be ISC_R_INPROGRESS and the event will be sent when
898 * the operation completes.
900 *\li ISC_SOCKFLAG_NORETRY can only be set for UDP sockets. If set
901 * and the send operation fails due to a transient error, the send
902 * will not be retried and the error will be indicated in the event.
903 * Using this option along with ISC_SOCKFLAG_IMMEDIATE allows the caller
904 * to specify a region that is allocated on the stack.
908 *\li 'socket' is a valid, bound socket.
910 *\li For isc_socket_send():
911 * 'region' is a valid region
913 *\li For isc_socket_sendv() and isc_socket_sendtov():
914 * 'buflist' is non-NULL, and '*buflist' contain at least one buffer.
916 *\li 'task' is a valid task
918 *\li For isc_socket_sendv(), isc_socket_sendtov(), isc_socket_send(), and
919 * isc_socket_sendto():
920 * action == NULL or is a valid action
922 *\li For isc_socket_sendto2():
928 *\li #ISC_R_INPROGRESS
930 *\li #ISC_R_UNEXPECTED
935 *\li #ISC_R_UNEXPECTED
936 *\li XXX needs other net-type errors
941 isc_socketmgr_createinctx(isc_mem_t *mctx, isc_appctx_t *actx,
942 isc_socketmgr_t **managerp);
945 isc_socketmgr_create(isc_mem_t *mctx, isc_socketmgr_t **managerp);
948 isc_socketmgr_create2(isc_mem_t *mctx, isc_socketmgr_t **managerp,
949 unsigned int maxsocks);
951 * Create a socket manager. If "maxsocks" is non-zero, it specifies the
952 * maximum number of sockets that the created manager should handle.
953 * isc_socketmgr_create() is equivalent of isc_socketmgr_create2() with
954 * "maxsocks" being zero.
955 * isc_socketmgr_createinctx() also associates the new manager with the
956 * specified application context.
960 *\li All memory will be allocated in memory context 'mctx'.
964 *\li 'mctx' is a valid memory context.
966 *\li 'managerp' points to a NULL isc_socketmgr_t.
968 *\li 'actx' is a valid application context (for createinctx()).
972 *\li '*managerp' is a valid isc_socketmgr_t.
978 *\li #ISC_R_UNEXPECTED
979 *\li #ISC_R_NOTIMPLEMENTED
983 isc_socketmgr_getmaxsockets(isc_socketmgr_t *manager, unsigned int *nsockp);
985 * Returns in "*nsockp" the maximum number of sockets this manager may open.
989 *\li '*manager' is a valid isc_socketmgr_t.
990 *\li 'nsockp' is not NULL.
995 *\li #ISC_R_NOTIMPLEMENTED
999 isc_socketmgr_setstats(isc_socketmgr_t *manager, isc_stats_t *stats);
1001 * Set a general socket statistics counter set 'stats' for 'manager'.
1004 * \li 'manager' is valid, hasn't opened any socket, and doesn't have
1005 * stats already set.
1007 *\li stats is a valid statistics supporting socket statistics counters
1012 isc_socketmgr_destroy(isc_socketmgr_t **managerp);
1014 * Destroy a socket manager.
1018 *\li This routine blocks until there are no sockets left in the manager,
1019 * so if the caller holds any socket references using the manager, it
1020 * must detach them before calling isc_socketmgr_destroy() or it will
1025 *\li '*managerp' is a valid isc_socketmgr_t.
1027 *\li All sockets managed by this manager are fully detached.
1031 *\li *managerp == NULL
1033 *\li All resources used by the manager have been freed.
1037 isc_socket_gettype(isc_socket_t *sock);
1039 * Returns the socket type for "sock."
1043 *\li "sock" is a valid socket.
1048 isc_socket_isbound(isc_socket_t *sock);
1051 isc_socket_ipv6only(isc_socket_t *sock, isc_boolean_t yes);
1053 * If the socket is an IPv6 socket set/clear the IPV6_IPV6ONLY socket
1054 * option if the host OS supports this option.
1057 *\li 'sock' is a valid socket.
1062 isc_socket_cleanunix(isc_sockaddr_t *addr, isc_boolean_t active);
1065 * Cleanup UNIX domain sockets in the file-system. If 'active' is true
1066 * then just unlink the socket. If 'active' is false try to determine
1067 * if there is a listener of the socket or not. If no listener is found
1068 * then unlink socket.
1070 * Prior to unlinking the path is tested to see if it a socket.
1072 * Note: there are a number of race conditions which cannot be avoided
1073 * both in the filesystem and any application using UNIX domain
1074 * sockets (e.g. socket is tested between bind() and listen(),
1075 * the socket is deleted and replaced in the file-system between
1076 * stat() and unlink()).
1080 isc_socket_permunix(isc_sockaddr_t *sockaddr, isc_uint32_t perm,
1081 isc_uint32_t owner, isc_uint32_t group);
1083 * Set ownership and file permissions on the UNIX domain socket.
1085 * Note: On Solaris and SunOS this secures the directory containing
1086 * the socket as Solaris and SunOS do not honour the filesystem
1087 * permissions on the socket.
1090 * \li 'sockaddr' to be a valid UNIX domain sockaddr.
1093 * \li #ISC_R_SUCCESS
1094 * \li #ISC_R_FAILURE
1097 void isc_socket_setname(isc_socket_t *sock, const char *name, void *tag);
1099 * Set the name and optional tag for a socket. This allows tracking of the
1100 * owner or purpose for this socket, and is useful for tracing and statistics
1104 const char *isc_socket_getname(isc_socket_t *sock);
1106 * Get the name associated with a socket, if any.
1109 void *isc_socket_gettag(isc_socket_t *sock);
1111 * Get the tag associated with a socket, if any.
1114 int isc_socket_getfd(isc_socket_t *sock);
1116 * Get the file descriptor associated with a socket
1120 isc__socketmgr_setreserved(isc_socketmgr_t *mgr, isc_uint32_t);
1122 * Temporary. For use by named only.
1126 isc__socketmgr_maxudp(isc_socketmgr_t *mgr, int maxudp);
1128 * Test interface. Drop UDP packet > 'maxudp'.
1134 isc_socketmgr_renderxml(isc_socketmgr_t *mgr, xmlTextWriterPtr writer);
1136 * Render internal statistics and other state into the XML document.
1139 #endif /* HAVE_LIBXML2 */
1141 #ifdef USE_SOCKETIMPREGISTER
1143 * See isc_socketmgr_create() above.
1145 typedef isc_result_t
1146 (*isc_socketmgrcreatefunc_t)(isc_mem_t *mctx, isc_socketmgr_t **managerp);
1149 isc_socket_register(isc_socketmgrcreatefunc_t createfunc);
1151 * Register a new socket I/O implementation and add it to the list of
1152 * supported implementations. This function must be called when a different
1153 * event library is used than the one contained in the ISC library.
1157 isc__socket_register(void);
1159 * A short cut function that specifies the socket I/O module in the ISC
1160 * library for isc_socket_register(). An application that uses the ISC library
1161 * usually do not have to care about this function: it would call
1162 * isc_lib_register(), which internally calls this function.
1164 #endif /* USE_SOCKETIMPREGISTER */
1168 #endif /* ISC_SOCKET_H */