CFSocket.h

   1 /*
   2  * Copyright (c) 2008 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*      CFSocket.h
  24         Copyright (c) 1999-2007, Apple Inc.  All rights reserved.
  25 */
  26
  27 #if !defined(__COREFOUNDATION_CFSOCKET__)
  28 #define __COREFOUNDATION_CFSOCKET__ 1
  29
  30 #if defined(__WIN32__)
  31 // This needs to be early in the file, before sys/types gets included, or winsock.h complains
  32 // about "fd_set and associated macros have been defined".
  33 #include <winsock2.h>
  34 typedef SOCKET CFSocketNativeHandle;
  35 #else
  36 typedef int CFSocketNativeHandle;
  37 #endif
  38
  39 #include <CoreFoundation/CFRunLoop.h>
  40 #include <CoreFoundation/CFData.h>
  41
  42 CF_EXTERN_C_BEGIN
  43
  44 typedef struct __CFSocket * CFSocketRef;
  45
  46 /* A CFSocket contains a native socket within a structure that can
  47 be used to read from the socket in the background and make the data
  48 thus read available using a runloop source.  The callback used for
  49 this may be of three types, as specified by the callBackTypes
  50 argument when creating the CFSocket.
  51
  52 If kCFSocketReadCallBack is used, then data will not be
  53 automatically read, but the callback will be called when data
  54 is available to be read, or a new child socket is waiting to be
  55 accepted.
  56
  57 If kCFSocketAcceptCallBack is used, then new child sockets will be
  58 accepted and passed to the callback, with the data argument being
  59 a pointer to a CFSocketNativeHandle.  This is usable only with
  60 connection rendezvous sockets.
  61
  62 If kCFSocketDataCallBack is used, then data will be read in chunks
  63 in the background and passed to the callback, with the data argument
  64 being a CFDataRef.
  65
  66 These three types are mutually exclusive, but any one of them may
  67 have kCFSocketConnectCallBack added to it, if the socket will be
  68 used to connect in the background.  Connect in the background occurs
  69 if CFSocketConnectToAddress is called with a negative timeout
  70 value, in which case the call returns immediately, and a
  71 kCFSocketConnectCallBack is generated when the connect finishes.
  72 In this case the data argument is either NULL, or a pointer to
  73 an SInt32 error code if the connect failed.  kCFSocketConnectCallBack
  74 will never be sent more than once for a given socket.
  75
  76 The callback types may also have kCFSocketWriteCallBack added to
  77 them, if large amounts of data are to be sent rapidly over the
  78 socket and notification is desired when there is space in the
  79 kernel buffers so that the socket is writable again.
  80
  81 With a connection-oriented socket, if the connection is broken from the
  82 other end, then one final kCFSocketReadCallBack or kCFSocketDataCallBack
  83 will occur.  In the case of kCFSocketReadCallBack, the underlying socket
  84 will have 0 bytes available to read.  In the case of kCFSocketDataCallBack,
  85 the data argument will be a CFDataRef of length 0.
  86
  87 There are socket flags that may be set to control whether callbacks of
  88 a given type are automatically reenabled after they are triggered, and
  89 whether the underlying native socket will be closed when the CFSocket
  90 is invalidated.  By default read, accept, and data callbacks are
  91 automatically reenabled; write callbacks are not, and connect callbacks
  92 may not be, since they are sent once only.  Be careful about automatically
  93 reenabling read and write callbacks, since this implies that the
  94 callbacks will be sent repeatedly if the socket remains readable or
  95 writable respectively.  Be sure to set these flags only for callbacks
  96 that your CFSocket actually possesses; the result of setting them for
  97 other callback types is undefined.
  98
  99 Individual callbacks may also be enabled and disabled manually, whether
 100 they are automatically reenabled or not.  If they are not automatically
 101 reenabled, then they will need to be manually reenabled when the callback
 102 is ready to be received again (and not sooner).  Even if they are
 103 automatically reenabled, there may be occasions when it will be useful
 104 to be able to manually disable them temporarily and then reenable them.
 105 Be sure to enable and disable only callbacks that your CFSocket actually
 106 possesses; the result of enabling and disabling other callback types is
 107 undefined.
 108
 109 By default the underlying native socket will be closed when the CFSocket
 110 is invalidated, but it will not be if kCFSocketCloseOnInvalidate is
 111 turned off.  This can be useful in order to destroy a CFSocket but
 112 continue to use the underlying native socket.  The CFSocket must
 113 still be invalidated when it will no longer be used.  Do not in
 114 either case close the underlying native socket without invalidating
 115 the CFSocket.
 116
 117 Addresses are stored as CFDatas containing a struct sockaddr
 118 appropriate for the protocol family; make sure that all fields are
 119 filled in properly when passing in an address.
 120
 121 */
 122
 123 /* Values for CFSocketError */
 124 enum {
 125     kCFSocketSuccess = 0,
 126     kCFSocketError = -1,
 127     kCFSocketTimeout = -2
 128 };
 129 typedef CFIndex CFSocketError;
 130
 131 typedef struct {
 132     SInt32      protocolFamily;
 133     SInt32      socketType;
 134     SInt32      protocol;
 135     CFDataRef   address;
 136 } CFSocketSignature;
 137
 138 /* Values for CFSocketCallBackType */
 139 enum {
 140     kCFSocketNoCallBack = 0,
 141     kCFSocketReadCallBack = 1,
 142     kCFSocketAcceptCallBack = 2,
 143     kCFSocketDataCallBack = 3,
 144     kCFSocketConnectCallBack = 4
 145 #if MAC_OS_X_VERSION_10_2 <= MAC_OS_X_VERSION_MAX_ALLOWED
 146     ,
 147     kCFSocketWriteCallBack = 8
 148 #endif
 149 };
 150 typedef CFOptionFlags CFSocketCallBackType;
 151
 152 #if MAC_OS_X_VERSION_10_2 <= MAC_OS_X_VERSION_MAX_ALLOWED
 153 /* Socket flags */
 154 enum {
 155     kCFSocketAutomaticallyReenableReadCallBack = 1,
 156     kCFSocketAutomaticallyReenableAcceptCallBack = 2,
 157     kCFSocketAutomaticallyReenableDataCallBack = 3,
 158     kCFSocketAutomaticallyReenableWriteCallBack = 8,
 159     kCFSocketCloseOnInvalidate = 128
 160 };
 161 #endif
 162
 163 typedef void (*CFSocketCallBack)(CFSocketRef s, CFSocketCallBackType type, CFDataRef address, const void *data, void *info);
 164 /* If the callback wishes to keep hold of address or data after the point that it returns, then it must copy them. */
 165
 166 typedef struct {
 167     CFIndex     version;
 168     void *      info;
 169     const void *(*retain)(const void *info);
 170     void        (*release)(const void *info);
 171     CFStringRef (*copyDescription)(const void *info);
 172 } CFSocketContext;
 173
 174 CF_EXPORT CFTypeID      CFSocketGetTypeID(void);
 175
 176 CF_EXPORT CFSocketRef   CFSocketCreate(CFAllocatorRef allocator, SInt32 protocolFamily, SInt32 socketType, SInt32 protocol, CFOptionFlags callBackTypes, CFSocketCallBack callout, const CFSocketContext *context);
 177 CF_EXPORT CFSocketRef   CFSocketCreateWithNative(CFAllocatorRef allocator, CFSocketNativeHandle sock, CFOptionFlags callBackTypes, CFSocketCallBack callout, const CFSocketContext *context);
 178 CF_EXPORT CFSocketRef   CFSocketCreateWithSocketSignature(CFAllocatorRef allocator, const CFSocketSignature *signature, CFOptionFlags callBackTypes, CFSocketCallBack callout, const CFSocketContext *context);
 179 CF_EXPORT CFSocketRef   CFSocketCreateConnectedToSocketSignature(CFAllocatorRef allocator, const CFSocketSignature *signature, CFOptionFlags callBackTypes, CFSocketCallBack callout, const CFSocketContext *context, CFTimeInterval timeout);
 180 /* CFSocketCreateWithSignature creates a socket of the requested type and binds its address (using CFSocketSetAddress) to the requested address.  If this fails, it returns NULL.  CFSocketCreateConnectedToSignature creates a socket suitable for connecting to the requested type and address, and connects it (using CFSocketConnectToAddress).  If this fails, it returns NULL. */
 181
 182 CF_EXPORT CFSocketError CFSocketSetAddress(CFSocketRef s, CFDataRef address);
 183 CF_EXPORT CFSocketError CFSocketConnectToAddress(CFSocketRef s, CFDataRef address, CFTimeInterval timeout);
 184 CF_EXPORT void          CFSocketInvalidate(CFSocketRef s);
 185
 186 CF_EXPORT Boolean       CFSocketIsValid(CFSocketRef s);
 187 CF_EXPORT CFDataRef     CFSocketCopyAddress(CFSocketRef s);
 188 CF_EXPORT CFDataRef     CFSocketCopyPeerAddress(CFSocketRef s);
 189 CF_EXPORT void          CFSocketGetContext(CFSocketRef s, CFSocketContext *context);
 190 CF_EXPORT CFSocketNativeHandle  CFSocketGetNative(CFSocketRef s);
 191
 192 CF_EXPORT CFRunLoopSourceRef    CFSocketCreateRunLoopSource(CFAllocatorRef allocator, CFSocketRef s, CFIndex order);
 193
 194 #if MAC_OS_X_VERSION_10_2 <= MAC_OS_X_VERSION_MAX_ALLOWED
 195 CF_EXPORT CFOptionFlags CFSocketGetSocketFlags(CFSocketRef s);
 196 CF_EXPORT void          CFSocketSetSocketFlags(CFSocketRef s, CFOptionFlags flags);
 197 CF_EXPORT void          CFSocketDisableCallBacks(CFSocketRef s, CFOptionFlags callBackTypes);
 198 CF_EXPORT void          CFSocketEnableCallBacks(CFSocketRef s, CFOptionFlags callBackTypes);
 199 #endif
 200
 201 /* For convenience, a function is provided to send data using the socket with a timeout.  The timeout will be used only if the specified value is positive.  The address should be left NULL if the socket is already connected. */
 202 CF_EXPORT CFSocketError CFSocketSendData(CFSocketRef s, CFDataRef address, CFDataRef data, CFTimeInterval timeout);
 203
 204 /* Generic name registry functionality (CFSocketRegisterValue,
 205 CFSocketCopyRegisteredValue) allows the registration of any property
 206 list type.  Functions specific to CFSockets (CFSocketRegisterSocketData,
 207 CFSocketCopyRegisteredSocketData) register a CFData containing the
 208 components of a socket signature (protocol family, socket type,
 209 protocol, and address).  In each function the nameServerSignature
 210 may be NULL, or any component of it may be 0, to use default values
 211 (TCP, INADDR_LOOPBACK, port as set).  Name registration servers might
 212 not allow registration with other than TCP and INADDR_LOOPBACK.
 213 The actual address of the server responding to a query may be obtained
 214 by using the nameServerAddress argument.  This address, the address
 215 returned by CFSocketCopyRegisteredSocketSignature, and the value
 216 returned by CFSocketCopyRegisteredValue must (if non-null) be released
 217 by the caller.  CFSocketUnregister removes any registration associated
 218 with the specified name.
 219 */
 220
 221 CF_EXPORT CFSocketError CFSocketRegisterValue(const CFSocketSignature *nameServerSignature, CFTimeInterval timeout, CFStringRef name, CFPropertyListRef value);
 222 CF_EXPORT CFSocketError CFSocketCopyRegisteredValue(const CFSocketSignature *nameServerSignature, CFTimeInterval timeout, CFStringRef name, CFPropertyListRef *value, CFDataRef *nameServerAddress);
 223
 224 CF_EXPORT CFSocketError CFSocketRegisterSocketSignature(const CFSocketSignature *nameServerSignature, CFTimeInterval timeout, CFStringRef name, const CFSocketSignature *signature);
 225 CF_EXPORT CFSocketError CFSocketCopyRegisteredSocketSignature(const CFSocketSignature *nameServerSignature, CFTimeInterval timeout, CFStringRef name, CFSocketSignature *signature, CFDataRef *nameServerAddress);
 226
 227 CF_EXPORT CFSocketError CFSocketUnregister(const CFSocketSignature *nameServerSignature, CFTimeInterval timeout, CFStringRef name);
 228
 229 CF_EXPORT void          CFSocketSetDefaultNameRegistryPortNumber(UInt16 port);
 230 CF_EXPORT UInt16        CFSocketGetDefaultNameRegistryPortNumber(void);
 231
 232 /* Constants used in name registry server communications */
 233 CF_EXPORT const CFStringRef kCFSocketCommandKey;
 234 CF_EXPORT const CFStringRef kCFSocketNameKey;
 235 CF_EXPORT const CFStringRef kCFSocketValueKey;
 236 CF_EXPORT const CFStringRef kCFSocketResultKey;
 237 CF_EXPORT const CFStringRef kCFSocketErrorKey;
 238 CF_EXPORT const CFStringRef kCFSocketRegisterCommand;
 239 CF_EXPORT const CFStringRef kCFSocketRetrieveCommand;
 240
 241 CF_EXTERN_C_END
 242
 243 #endif /* ! __COREFOUNDATION_CFSOCKET__ */
 244