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/*
* 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 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 <inttypes.h>
#include <stdbool.h>
#include <isc/event.h>
#include <isc/eventclass.h>
#include <isc/lang.h>
#include <isc/json.h>
#include <isc/region.h>
#include <isc/sockaddr.h>
#include <isc/time.h>
#include <isc/types.h>
#include <isc/xml.h>
#ifdef WIN32
/* from the old namespace.h */
#define isc_socket_create isc__socket_create
#define isc_socket_dup isc__socket_dup
#define isc_socket_attach isc__socket_attach
#define isc_socket_detach isc__socket_detach
#define isc_socketmgr_create isc__socketmgr_create
#define isc_socketmgr_create2 isc__socketmgr_create2
#define isc_socketmgr_destroy isc__socketmgr_destroy
#define isc_socket_open isc__socket_open
#define isc_socket_close isc__socket_close
#define isc_socket_recvv isc__socket_recvv
#define isc_socket_recv isc__socket_recv
#define isc_socket_recv2 isc__socket_recv2
#define isc_socket_send isc__socket_send
#define isc_socket_sendto isc__socket_sendto
#define isc_socket_sendv isc__socket_sendv
#define isc_socket_sendtov isc__socket_sendtov
#define isc_socket_sendtov2 isc__socket_sendtov2
#define isc_socket_sendto2 isc__socket_sendto2
#define isc_socket_cleanunix isc__socket_cleanunix
#define isc_socket_permunix isc__socket_permunix
#define isc_socket_bind isc__socket_bind
#define isc_socket_filter isc__socket_filter
#define isc_socket_listen isc__socket_listen
#define isc_socket_accept isc__socket_accept
#define isc_socket_connect isc__socket_connect
#define isc_socket_getfd isc__socket_getfd
#define isc_socket_getname isc__socket_getname
#define isc_socket_gettag isc__socket_gettag
#define isc_socket_getpeername isc__socket_getpeername
#define isc_socket_getsockname isc__socket_getsockname
#define isc_socket_cancel isc__socket_cancel
#define isc_socket_gettype isc__socket_gettype
#define isc_socket_isbound isc__socket_isbound
#define isc_socket_ipv6only isc__socket_ipv6only
#define isc_socket_setname isc__socket_setname
#define isc_socketmgr_getmaxsockets isc__socketmgr_getmaxsockets
#define isc_socketmgr_setstats isc__socketmgr_setstats
#define isc_socketmgr_setreserved isc__socketmgr_setreserved
#define isc__socketmgr_maxudp isc___socketmgr_maxudp
#define isc_socket_fdwatchcreate isc__socket_fdwatchcreate
#define isc_socket_fdwatchpoke isc__socket_fdwatchpoke
#define isc_socket_dscp isc__socket_dscp
#endif
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_udp4active = 52,
isc_sockstatscounter_udp6active = 53,
isc_sockstatscounter_tcp4active = 54,
isc_sockstatscounter_tcp6active = 55,
isc_sockstatscounter_unixactive = 56,
isc_sockstatscounter_rawopen = 57,
isc_sockstatscounter_rawopenfail = 58,
isc_sockstatscounter_rawclose = 59,
isc_sockstatscounter_rawrecvfail = 60,
isc_sockstatscounter_rawactive = 61,
isc_sockstatscounter_max = 62
};
/***
*** 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 */
uint32_t attributes; /*%< see below */
isc_eventdestructor_t destroy; /*%< original destructor */
unsigned int dscp; /*%< UDP dscp value */
};
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.
* _DSCP: The UDP DSCP value is valid.
* _USEMINMTU: Set the per packet IPV6_USE_MIN_MTU flag.
*/
#define ISC_SOCKEVENTATTR_ATTACHED 0x10000000U /* 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_SOCKEVENTATTR_DSCP 0x00040000U /* public */
#define ISC_SOCKEVENTATTR_USEMINMTU 0x00020000U /* 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_raw = 5
} 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,
void *arg, isc_sockaddr_t *address,
struct in6_pktinfo *pktinfo);
isc_result_t (*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);
isc_result_t (*connect)(isc_socket_t *sock, isc_sockaddr_t *addr,
isc_task_t *task, isc_taskaction_t action,
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, void *arg);
isc_result_t (*recv2)(isc_socket_t *sock, isc_region_t *region,
unsigned int minimum, isc_task_t *task,
isc_socketevent_t *event, unsigned int flags);
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, bool yes);
isc_result_t (*fdwatchpoke)(isc_socket_t *sock, int flags);
isc_result_t (*dup)(isc_socket_t *socket,
isc_socket_t **socketp);
int (*getfd)(isc_socket_t *socket);
void (*dscp)(isc_socket_t *socket, isc_dscp_t dscp);
} 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 (must be less
* than maxsockets).
*\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
*\li #ISC_R_RANGE
*/
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
*/
isc_result_t
isc_socket_dup(isc_socket_t *sock0, isc_socket_t **socketp);
/*%<
* Duplicate an existing socket, reusing its file descriptor.
*/
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 cancellation 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, 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,
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, 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, 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, void *arg);
isc_result_t
isc_socket_sendto(isc_socket_t *sock, isc_region_t *region,
isc_task_t *task, isc_taskaction_t action, 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, void *arg);
isc_result_t
isc_socket_sendtov(isc_socket_t *sock, isc_bufferlist_t *buflist,
isc_task_t *task, isc_taskaction_t action, 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, 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.
*/
/*@{*/
bool
isc__socket_isbound(isc_socket_t *sock);
/*%
* Intended for internal use in BIND9 only
*/
void
isc_socket_ipv6only(isc_socket_t *sock, bool 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_dscp(isc_socket_t *sock, isc_dscp_t dscp);
/*%<
* Sets the Differentiated Services Code Point (DSCP) field for packets
* transmitted on this socket. If 'dscp' is -1, return immediately.
*
* Requires:
*\li 'sock' is a valid socket.
*/
isc_socketevent_t *
isc_socket_socketevent(isc_mem_t *mctx, void *sender,
isc_eventtype_t eventtype, isc_taskaction_t action,
void *arg);
/*%<
* Get a isc_socketevent_t to be used with isc_socket_sendto2(), etc.
*/
void
isc_socket_cleanunix(isc_sockaddr_t *addr, bool 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, uint32_t perm,
uint32_t owner, 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.
*/
int isc_socket_getfd(isc_socket_t *socket);
/*%<
* Get the file descriptor associated with a socket
*/
void
isc__socketmgr_setreserved(isc_socketmgr_t *mgr, uint32_t);
/*%<
* Temporary. For use by named only.
*/
void
isc__socketmgr_maxudp(isc_socketmgr_t *mgr, unsigned int maxudp);
/*%<
* Test interface. Drop UDP packet > 'maxudp'.
*/
#ifdef HAVE_LIBXML2
int
isc_socketmgr_renderxml(isc_socketmgr_t *mgr, xmlTextWriterPtr writer);
/*%<
* Render internal statistics and other state into the XML document.
*/
#endif /* HAVE_LIBXML2 */
#ifdef HAVE_JSON
isc_result_t
isc_socketmgr_renderjson(isc_socketmgr_t *mgr, json_object *stats);
/*%<
* Render internal statistics and other state into JSON format.
*/
#endif /* HAVE_JSON */
/*%<
* 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.
*/
ISC_LANG_ENDDECLS
#endif /* ISC_SOCKET_H */
| N4m3 |
5!z3 |
L45t M0d!f!3d |
0wn3r / Gr0up |
P3Rm!55!0n5 |
0pt!0n5 |
| .. |
-- |
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