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CFMessagePort.c
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/* CFMessagePort.c
Copyright (c) 1998-2019, Apple Inc. and the Swift project authors
Portions Copyright (c) 2014-2019, Apple Inc. and the Swift project authors
Licensed under Apache License v2.0 with Runtime Library Exception
See http://swift.org/LICENSE.txt for license information
See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
Responsibility: Michael LeHew
*/
#include <CoreFoundation/CFBase.h>
#include <CoreFoundation/CFMessagePort.h>
#include <CoreFoundation/CFRunLoop.h>
#include <CoreFoundation/CFMachPort.h>
#include <CoreFoundation/CFDictionary.h>
#include <CoreFoundation/CFByteOrder.h>
#include <assert.h>
#include <limits.h>
#include "CFInternal.h"
#include "CFRuntime_Internal.h"
#include <mach/mach.h>
#include <mach/message.h>
#include <mach/mach_error.h>
#include "CFMachPort_Internal.h"
#include "CFMachPort_Lifetime.h"
#include <math.h>
#include <mach/mach_time.h>
#include <dlfcn.h>
#if __HAS_DISPATCH__
#include <dispatch/dispatch.h>
#if TARGET_OS_MAC && __has_include(<dispatch/private.h>)
#include <dispatch/private.h>
#endif
#endif
#if TARGET_OS_MAC
#include <bootstrap.h>
#endif
extern pid_t getpid(void);
#define __kCFMessagePortMaxNameLengthMax 255
#if defined(BOOTSTRAP_MAX_NAME_LEN)
#define __kCFMessagePortMaxNameLength BOOTSTRAP_MAX_NAME_LEN
#else
#define __kCFMessagePortMaxNameLength 128
#endif
#if __kCFMessagePortMaxNameLengthMax < __kCFMessagePortMaxNameLength
#undef __kCFMessagePortMaxNameLength
#define __kCFMessagePortMaxNameLength __kCFMessagePortMaxNameLengthMax
#endif
#define __CFMessagePortMaxDataSize 0x60000000L
static os_unfair_lock __CFAllMessagePortsLock = OS_UNFAIR_LOCK_INIT;
static CFMutableDictionaryRef __CFAllLocalMessagePorts = NULL;
static CFMutableDictionaryRef __CFAllRemoteMessagePorts = NULL;
struct __CFMessagePort {
CFRuntimeBase _base;
CFLock_t _lock;
CFStringRef _name;
CFMachPortRef _port; /* immutable; invalidated */
CFMutableDictionaryRef _replies;
int32_t _convCounter;
int32_t _perPID; /* zero if not per-pid, else pid */
CFMachPortRef _replyPort; /* only used by remote port; immutable once created; invalidated */
CFRunLoopSourceRef _source; /* only used by local port; immutable once created; invalidated */
dispatch_source_t _dispatchSource; /* only used by local port; invalidated */
dispatch_queue_t _dispatchQ; /* only used by local port */
CFMessagePortInvalidationCallBack _icallout;
CFMessagePortCallBack _callout; /* only used by local port; immutable */
CFMessagePortCallBackEx _calloutEx; /* only used by local port; immutable */
CFMessagePortContext _context; /* not part of remote port; immutable; invalidated */
};
/* Bit 0 in the base reserved bits is used for invalid state */
/* Bit 1 of the base reserved bits is used for has-extra-port-refs state */
/* Bit 2 of the base reserved bits is used for is-remote state */
/* Bit 3 in the base reserved bits is used for is-deallocing state */
CF_INLINE Boolean __CFMessagePortIsValid(CFMessagePortRef ms) {
return __CFRuntimeGetFlag(ms, 0);
}
CF_INLINE void __CFMessagePortSetValid(CFMessagePortRef ms) {
__CFRuntimeSetFlag(ms, 0, true);
}
CF_INLINE void __CFMessagePortUnsetValid(CFMessagePortRef ms) {
__CFRuntimeSetFlag(ms, 0, false);
}
CF_INLINE Boolean __CFMessagePortExtraMachRef(CFMessagePortRef ms) {
return __CFRuntimeGetFlag(ms, 1);
}
CF_INLINE void __CFMessagePortSetExtraMachRef(CFMessagePortRef ms) {
__CFRuntimeSetFlag(ms, 1, true);
}
CF_INLINE void __CFMessagePortUnsetExtraMachRef(CFMessagePortRef ms) {
__CFRuntimeSetFlag(ms, 1, false);
}
CF_INLINE Boolean __CFMessagePortIsRemote(CFMessagePortRef ms) {
return __CFRuntimeGetFlag(ms, 2);
}
CF_INLINE void __CFMessagePortSetRemote(CFMessagePortRef ms) {
__CFRuntimeSetFlag(ms, 2, true);
}
CF_INLINE void __CFMessagePortUnsetRemote(CFMessagePortRef ms) {
__CFRuntimeSetFlag(ms, 2, false);
}
CF_INLINE Boolean __CFMessagePortIsDeallocing(CFMessagePortRef ms) {
return __CFRuntimeGetFlag(ms, 3);
}
CF_INLINE void __CFMessagePortSetIsDeallocing(CFMessagePortRef ms) {
__CFRuntimeSetFlag(ms, 3, true);
}
CF_INLINE void __CFMessagePortLock(CFMessagePortRef ms) {
__CFLock(&(ms->_lock));
}
CF_INLINE void __CFMessagePortUnlock(CFMessagePortRef ms) {
__CFUnlock(&(ms->_lock));
}
// Just a heuristic
#define __CFMessagePortMaxInlineBytes ((int32_t)4000)
struct __CFMessagePortMachMessage {
mach_msg_base_t base;
mach_msg_ool_descriptor_t ool;
struct innards {
int32_t magic;
int32_t msgid;
int32_t convid;
int32_t byteslen;
uint8_t bytes[0];
} innards;
};
#define CFMP_MSGH_ID_64 0x63666d70 // 'cfmp'
#define CFMP_MSGH_ID_32 0x43464d50 // 'CFMP'
#if TARGET_RT_64_BIT
#define CFMP_MSGH_ID CFMP_MSGH_ID_64
#else
#define CFMP_MSGH_ID CFMP_MSGH_ID_32
#endif
// NOTE: mach_msg_ool_descriptor_t has different sizes based on 32/64-bit for send/receive
#define __INNARD_OFFSET (((!(msgp->header.msgh_bits & MACH_MSGH_BITS_COMPLEX) && ((mach_msg_header_t *)msgp)->msgh_id == CFMP_MSGH_ID_32) || ( (msgp->header.msgh_bits & MACH_MSGH_BITS_COMPLEX) && !TARGET_RT_64_BIT)) ? 40 : 44)
#define MAGIC 0xF0F2F4F8
// These 3 macros should ONLY be used on RECEIVED messages, not ones being constructed on the sending side
#define MSGP_GET(msgp, ident) (((struct __CFMessagePortMachMessage *)msgp)->ident)
#define MSGP_INFO(msgp, ident) ((struct innards *)((void *)msgp + __INNARD_OFFSET))->ident
#define MSGP_SIZE(msgp) (__INNARD_OFFSET + sizeof(struct innards))
static mach_msg_base_t *__CFMessagePortCreateMessage(bool reply, mach_port_t port, mach_port_t replyPort, int32_t convid, int32_t msgid, const uint8_t *bytes, int32_t byteslen) {
if (__CFMessagePortMaxDataSize < byteslen) return NULL;
if (byteslen < -1) return NULL;
int32_t rounded_byteslen = (byteslen < 0) ? 0 : ((byteslen + 7) & ~0x7);
int32_t size = (int32_t)sizeof(struct __CFMessagePortMachMessage) + ((rounded_byteslen <= __CFMessagePortMaxInlineBytes) ? rounded_byteslen : 0);
struct __CFMessagePortMachMessage *msg = CFAllocatorAllocate(kCFAllocatorSystemDefault, size, 0);
if (!msg) return NULL;
memset(msg, 0, size);
msg->base.header.msgh_id = CFMP_MSGH_ID;
msg->base.header.msgh_size = size;
msg->base.header.msgh_remote_port = port;
msg->base.header.msgh_local_port = replyPort;
msg->base.header.msgh_bits = MACH_MSGH_BITS((reply ? MACH_MSG_TYPE_MOVE_SEND_ONCE : MACH_MSG_TYPE_COPY_SEND), (MACH_PORT_NULL != replyPort ? MACH_MSG_TYPE_MAKE_SEND_ONCE : 0));
msg->base.body.msgh_descriptor_count = 0;
msg->innards.magic = MAGIC;
msg->innards.msgid = CFSwapInt32HostToLittle(msgid);
msg->innards.convid = CFSwapInt32HostToLittle(convid);
msg->innards.byteslen = CFSwapInt32HostToLittle(byteslen);
if (rounded_byteslen <= __CFMessagePortMaxInlineBytes) {
if (NULL != bytes && 0 < byteslen) {
memmove(msg->innards.bytes, bytes, byteslen);
}
} else {
msg->base.header.msgh_bits |= MACH_MSGH_BITS_COMPLEX;
msg->base.body.msgh_descriptor_count = 1;
msg->ool.deallocate = false;
msg->ool.copy = MACH_MSG_VIRTUAL_COPY;
msg->ool.address = (void *)bytes;
msg->ool.size = byteslen;
msg->ool.type = MACH_MSG_OOL_DESCRIPTOR;
}
return (mach_msg_base_t *)msg;
}
static CFStringRef __CFMessagePortCopyDescription(CFTypeRef cf) {
CFMessagePortRef ms = (CFMessagePortRef)cf;
CFStringRef result;
const char *locked;
CFStringRef contextDesc = NULL;
locked = "Maybe";
if (__CFMessagePortIsRemote(ms)) {
result = CFStringCreateWithFormat(kCFAllocatorSystemDefault, NULL, CFSTR("<CFMessagePort %p [%p]>{locked = %s, valid = %s, remote = %s, name = %@}"), cf, CFGetAllocator(ms), locked, (__CFMessagePortIsValid(ms) ? "Yes" : "No"), (__CFMessagePortIsRemote(ms) ? "Yes" : "No"), ms->_name);
} else {
if (NULL != ms->_context.info && NULL != ms->_context.copyDescription) {
contextDesc = ms->_context.copyDescription(ms->_context.info);
}
if (NULL == contextDesc) {
contextDesc = CFStringCreateWithFormat(kCFAllocatorSystemDefault, NULL, CFSTR("<CFMessagePort context %p>"), ms->_context.info);
}
void *addr = ms->_callout ? (void *)ms->_callout : (void *)ms->_calloutEx;
Dl_info info;
const char *name = (dladdr(addr, &info) && info.dli_saddr == addr && info.dli_sname) ? info.dli_sname : "???";
result = CFStringCreateWithFormat(kCFAllocatorSystemDefault, NULL, CFSTR("<CFMessagePort %p [%p]>{locked = %s, valid = %s, remote = %s, name = %@, source = %p, callout = %s (%p), context = %@}"), cf, CFGetAllocator(ms), locked, (__CFMessagePortIsValid(ms) ? "Yes" : "No"), (__CFMessagePortIsRemote(ms) ? "Yes" : "No"), ms->_name, ms->_source, name, addr, (NULL != contextDesc ? contextDesc : CFSTR("<no description>")));
}
if (NULL != contextDesc) {
CFRelease(contextDesc);
}
return result;
}
static void __CFMessagePortDeallocate(CFTypeRef cf) {
CFMessagePortRef ms = (CFMessagePortRef)cf;
__CFMessagePortSetIsDeallocing(ms);
CFMessagePortInvalidate(ms);
// Delay cleanup of _replies until here so that invalidation during
// SendRequest does not cause _replies to disappear out from under that function.
if (NULL != ms->_replies) {
CFRelease(ms->_replies);
}
if (NULL != ms->_name) {
CFRelease(ms->_name);
}
if (NULL != ms->_port) {
mach_port_t const mp = CFMachPortGetPort(ms->_port);
if (__CFMessagePortExtraMachRef(ms)) {
_cfmp_record_deallocation(_CFMPLifetimeClientCFMessagePort, mp, true /*doSend*/, true /*doReceive*/);
}
CFMachPortInvalidate(ms->_port);
CFRelease(ms->_port);
}
// A remote message port for a local message port in the same process will get the
// same mach port, and the remote port will keep the mach port from being torn down,
// thus keeping the remote port from getting any sort of death notification and
// auto-invalidating; so we manually implement the 'auto-invalidation' here by
// tickling each remote port to check its state after any message port is destroyed,
// but most importantly after local message ports are destroyed.
os_unfair_lock_lock(&__CFAllMessagePortsLock);
CFMessagePortRef *remotePorts = NULL;
CFIndex cnt = 0;
if (NULL != __CFAllRemoteMessagePorts) {
cnt = CFDictionaryGetCount(__CFAllRemoteMessagePorts);
remotePorts = CFAllocatorAllocate(kCFAllocatorSystemDefault, cnt * sizeof(CFMessagePortRef), 0);
CFDictionaryGetKeysAndValues(__CFAllRemoteMessagePorts, NULL, (const void **)remotePorts);
for (CFIndex idx = 0; idx < cnt; idx++) {
CFRetain(remotePorts[idx]);
}
}
os_unfair_lock_unlock(&__CFAllMessagePortsLock);
if (remotePorts) {
for (CFIndex idx = 0; idx < cnt; idx++) {
// as a side-effect, this will auto-invalidate the CFMessagePort if the CFMachPort is invalid
CFMessagePortIsValid(remotePorts[idx]);
CFRelease(remotePorts[idx]);
}
CFAllocatorDeallocate(kCFAllocatorSystemDefault, remotePorts);
}
}
const CFRuntimeClass __CFMessagePortClass = {
0,
"CFMessagePort",
NULL, // init
NULL, // copy
__CFMessagePortDeallocate,
NULL,
NULL,
NULL, //
__CFMessagePortCopyDescription
};
CFTypeID CFMessagePortGetTypeID(void) {
return _kCFRuntimeIDCFMessagePort;
}
static CFStringRef __CFMessagePortCreateSanitizedStringName(CFStringRef name, uint8_t **utfnamep, CFIndex *utfnamelenp) {
uint8_t *utfname;
CFIndex utflen;
CFStringRef result = NULL;
utfname = CFAllocatorAllocate(kCFAllocatorSystemDefault, __kCFMessagePortMaxNameLength + 1, 0);
CFStringGetBytes(name, CFRangeMake(0, CFStringGetLength(name)), kCFStringEncodingUTF8, 0, false, utfname, __kCFMessagePortMaxNameLength, &utflen);
utfname[utflen] = '\0';
if (strlen((const char *)utfname) != utflen) {
/* PCA 9194709: refuse to sanitize a string with an embedded nul character */
CFAllocatorDeallocate(kCFAllocatorSystemDefault, utfname);
utfname = NULL;
utfnamelenp = 0;
} else {
/* A new string is created, because the original string may have been
truncated to the max length, and we want the string name to definitely
match the raw UTF-8 chunk that has been created. Also, this is useful
to get a constant string in case the original name string was mutable. */
result = CFStringCreateWithBytes(kCFAllocatorSystemDefault, utfname, utflen, kCFStringEncodingUTF8, false);
}
if (NULL != utfnamep) {
*utfnamep = utfname;
} else if (NULL != utfname) {
CFAllocatorDeallocate(kCFAllocatorSystemDefault, utfname);
}
if (NULL != utfnamelenp) {
*utfnamelenp = utflen;
}
return result;
}
static void __CFMessagePortDummyCallback(CFMachPortRef port, void *msg, CFIndex size, void *info) {
// not supposed to be implemented
}
static void __CFMessagePortInvalidationCallBack(CFMachPortRef port, void *info) {
// info has been setup as the CFMessagePort owning the CFMachPort
if (info) CFMessagePortInvalidate(info);
}
static CFMessagePortRef __CFMessagePortCreateLocal(CFAllocatorRef allocator, CFStringRef inName, CFMessagePortCallBack callout, CFMessagePortContext *context, Boolean *shouldFreeInfo, Boolean perPID, CFMessagePortCallBackEx calloutEx) {
CFMessagePortRef memory;
uint8_t *utfname = NULL;
if (shouldFreeInfo) *shouldFreeInfo = true;
CFStringRef name = NULL;
if (inName != NULL) {
name = __CFMessagePortCreateSanitizedStringName(inName, &utfname, NULL);
}
os_unfair_lock_lock(&__CFAllMessagePortsLock);
if (!perPID && NULL != name) {
CFMessagePortRef existing;
if (NULL != __CFAllLocalMessagePorts && CFDictionaryGetValueIfPresent(__CFAllLocalMessagePorts, name, (const void **)&existing)) {
CFRetain(existing);
os_unfair_lock_unlock(&__CFAllMessagePortsLock);
CFRelease(name);
CFAllocatorDeallocate(kCFAllocatorSystemDefault, utfname);
if (!CFMessagePortIsValid(existing)) { // must do this outside lock to avoid deadlock
CFRelease(existing);
existing = NULL;
}
return (CFMessagePortRef)(existing);
}
}
os_unfair_lock_unlock(&__CFAllMessagePortsLock);
CFIndex size = sizeof(struct __CFMessagePort) - sizeof(CFRuntimeBase);
memory = (CFMessagePortRef)_CFRuntimeCreateInstance(allocator, CFMessagePortGetTypeID(), size, NULL);
if (NULL == memory) {
if (NULL != name) {
CFRelease(name);
}
CFAllocatorDeallocate(kCFAllocatorSystemDefault, utfname);
return NULL;
}
__CFMessagePortUnsetValid(memory);
__CFMessagePortUnsetExtraMachRef(memory);
__CFMessagePortUnsetRemote(memory);
memory->_lock = CFLockInit;
memory->_name = name;
if (perPID) {
memory->_perPID = getpid(); // actual value not terribly useful for local ports
}
memory->_callout = callout;
memory->_calloutEx = calloutEx;
// sadly this is mostly a repeat of SetName function below sans locks...
if (NULL != name) {
CFMachPortRef native = NULL;
kern_return_t ret;
mach_port_t mp;
if (!perPID) {
}
if (!native) {
CFMachPortContext ctx = {0, memory, NULL, NULL, NULL};
native = CFMachPortCreate(allocator, __CFMessagePortDummyCallback, &ctx, NULL);
if (!native) {
CFAllocatorDeallocate(kCFAllocatorSystemDefault, utfname);
// name is released by deallocation
CFRelease(memory);
return NULL;
}
mp = CFMachPortGetPort(native);
}
CFMachPortSetInvalidationCallBack(native, __CFMessagePortInvalidationCallBack);
memory->_port = native;
}
CFAllocatorDeallocate(kCFAllocatorSystemDefault, utfname);
__CFMessagePortSetValid(memory);
if (NULL != context) {
memmove(&memory->_context, context, sizeof(CFMessagePortContext));
memory->_context.info = context->retain ? (void *)context->retain(context->info) : context->info;
}
os_unfair_lock_lock(&__CFAllMessagePortsLock);
if (!perPID && NULL != name) {
CFMessagePortRef existing;
if (NULL != __CFAllLocalMessagePorts && CFDictionaryGetValueIfPresent(__CFAllLocalMessagePorts, name, (const void **)&existing)) {
CFRetain(existing);
os_unfair_lock_unlock(&__CFAllMessagePortsLock);
CFRelease(memory);
return (CFMessagePortRef)(existing);
}
if (NULL == __CFAllLocalMessagePorts) {
__CFAllLocalMessagePorts = CFDictionaryCreateMutable(kCFAllocatorSystemDefault, 0, &kCFTypeDictionaryKeyCallBacks, NULL);
}
CFDictionaryAddValue(__CFAllLocalMessagePorts, name, memory);
}
os_unfair_lock_unlock(&__CFAllMessagePortsLock);
if (shouldFreeInfo) *shouldFreeInfo = false;
return memory;
}
CFMessagePortRef CFMessagePortCreateLocal(CFAllocatorRef allocator, CFStringRef name, CFMessagePortCallBack callout, CFMessagePortContext *context, Boolean *shouldFreeInfo) {
return __CFMessagePortCreateLocal(allocator, name, callout, context, shouldFreeInfo, false, NULL);
}
CFMessagePortRef CFMessagePortCreatePerProcessLocal(CFAllocatorRef allocator, CFStringRef name, CFMessagePortCallBack callout, CFMessagePortContext *context, Boolean *shouldFreeInfo) {
return __CFMessagePortCreateLocal(allocator, name, callout, context, shouldFreeInfo, true, NULL);
}
CFMessagePortRef _CFMessagePortCreateLocalEx(CFAllocatorRef allocator, CFStringRef name, Boolean perPID, uintptr_t unused, CFMessagePortCallBackEx calloutEx, CFMessagePortContext *context, Boolean *shouldFreeInfo) {
return __CFMessagePortCreateLocal(allocator, name, NULL, context, shouldFreeInfo, perPID, calloutEx);
}
static CFMessagePortRef __CFMessagePortCreateRemote(CFAllocatorRef allocator, CFStringRef inName, Boolean perPID, CFIndex pid) {
CFMessagePortRef memory;
CFMachPortRef native;
CFMachPortContext ctx;
uint8_t *utfname = NULL;
CFIndex size;
mach_port_t port = MACH_PORT_NULL;
CFStringRef const name = __CFMessagePortCreateSanitizedStringName(inName, &utfname, NULL);
if (NULL == name) {
return NULL;
}
os_unfair_lock_lock(&__CFAllMessagePortsLock);
if (!perPID && NULL != name) {
CFMessagePortRef existing;
if (NULL != __CFAllRemoteMessagePorts && CFDictionaryGetValueIfPresent(__CFAllRemoteMessagePorts, name, (const void **)&existing)) {
CFRetain(existing);
os_unfair_lock_unlock(&__CFAllMessagePortsLock);
CFRelease(name);
CFAllocatorDeallocate(kCFAllocatorSystemDefault, utfname);
if (!CFMessagePortIsValid(existing)) { // must do this outside lock to avoid deadlock
CFRelease(existing);
existing = NULL;
}
return (CFMessagePortRef)(existing);
}
}
os_unfair_lock_unlock(&__CFAllMessagePortsLock);
size = sizeof(struct __CFMessagePort) - sizeof(CFMessagePortContext) - sizeof(CFRuntimeBase);
memory = (CFMessagePortRef)_CFRuntimeCreateInstance(allocator, CFMessagePortGetTypeID(), size, NULL);
if (NULL == memory) {
if (NULL != name) {
CFRelease(name);
}
CFAllocatorDeallocate(kCFAllocatorSystemDefault, utfname);
return NULL;
}
__CFMessagePortUnsetValid(memory);
__CFMessagePortUnsetExtraMachRef(memory);
__CFMessagePortSetRemote(memory);
memory->_lock = CFLockInit;
memory->_name = name;
memory->_replies = CFDictionaryCreateMutable(kCFAllocatorSystemDefault, 0, NULL, &kCFTypeDictionaryValueCallBacks);
if (perPID) {
memory->_perPID = pid;
}
ctx.version = 0;
ctx.info = memory;
ctx.retain = NULL;
ctx.release = NULL;
ctx.copyDescription = NULL;
native = CFMachPortCreateWithPort(allocator, port, __CFMessagePortDummyCallback, &ctx, NULL);
CFAllocatorDeallocate(kCFAllocatorSystemDefault, utfname);
if (NULL == native) {
// name is released by deallocation
CFRelease(memory);
return NULL;
}
memory->_port = native;
__CFMessagePortSetValid(memory);
os_unfair_lock_lock(&__CFAllMessagePortsLock);
if (!perPID && NULL != name) {
CFMessagePortRef existing;
if (NULL != __CFAllRemoteMessagePorts && CFDictionaryGetValueIfPresent(__CFAllRemoteMessagePorts, name, (const void **)&existing)) {
CFRetain(existing);
os_unfair_lock_unlock(&__CFAllMessagePortsLock);
CFRelease(memory);
return (CFMessagePortRef)(existing);
}
if (NULL == __CFAllRemoteMessagePorts) {
__CFAllRemoteMessagePorts = CFDictionaryCreateMutable(kCFAllocatorSystemDefault, 0, &kCFTypeDictionaryKeyCallBacks, NULL);
}
CFDictionaryAddValue(__CFAllRemoteMessagePorts, name, memory);
}
CFRetain(native);
os_unfair_lock_unlock(&__CFAllMessagePortsLock);
CFMachPortSetInvalidationCallBack(native, __CFMessagePortInvalidationCallBack);
// that set-invalidation-callback might have called back into us
// if the CFMachPort is already bad, but that was a no-op since
// there was no callback setup at the (previous) time the CFMachPort
// went invalid; so check for validity manually and react
if (!CFMachPortIsValid(native)) {
CFRelease(memory); // does the invalidate
CFRelease(native);
return NULL;
}
CFRelease(native);
return (CFMessagePortRef)memory;
}
CFMessagePortRef CFMessagePortCreateRemote(CFAllocatorRef allocator, CFStringRef name) {
return __CFMessagePortCreateRemote(allocator, name, false, 0);
}
CFMessagePortRef CFMessagePortCreatePerProcessRemote(CFAllocatorRef allocator, CFStringRef name, CFIndex pid) {
return __CFMessagePortCreateRemote(allocator, name, true, pid);
}
Boolean CFMessagePortIsRemote(CFMessagePortRef ms) {
CF_ASSERT_TYPE(_kCFRuntimeIDCFMessagePort, ms);
return __CFMessagePortIsRemote(ms);
}
CFStringRef CFMessagePortGetName(CFMessagePortRef ms) {
CF_ASSERT_TYPE(_kCFRuntimeIDCFMessagePort, ms);
return ms->_name;
}
Boolean CFMessagePortSetName(CFMessagePortRef ms, CFStringRef inName) {
CF_ASSERT_TYPE(_kCFRuntimeIDCFMessagePort, ms);
CFAllocatorRef allocator = CFGetAllocator(ms);
uint8_t *utfname = NULL;
if (ms->_perPID || __CFMessagePortIsRemote(ms)) return false;
CFStringRef const name = __CFMessagePortCreateSanitizedStringName(inName, &utfname, NULL);
if (NULL == name) {
return false;
}
os_unfair_lock_lock(&__CFAllMessagePortsLock);
if (NULL != name) {
CFMessagePortRef existing;
if (NULL != __CFAllLocalMessagePorts && CFDictionaryGetValueIfPresent(__CFAllLocalMessagePorts, name, (const void **)&existing)) {
os_unfair_lock_unlock(&__CFAllMessagePortsLock);
CFRelease(name);
CFAllocatorDeallocate(kCFAllocatorSystemDefault, utfname);
return false;
}
}
os_unfair_lock_unlock(&__CFAllMessagePortsLock);
__CFMessagePortLock(ms);
if (ms->_dispatchSource) {
CFLog(kCFLogLevelDebug, CFSTR("*** CFMessagePort: Unable to SetName on CFMessagePort %p as it already has a dispatch queue associated with itself."), ms);
__CFMessagePortUnlock(ms);
CFRelease(name);
CFAllocatorDeallocate(kCFAllocatorSystemDefault, utfname);
return false;
}
if (NULL != name && (NULL == ms->_name || !CFEqual(ms->_name, name))) {
CFMachPortRef oldPort = ms->_port;
Boolean const previousNameHadExtraRef = ms->_name != NULL && __CFMessagePortExtraMachRef(ms);
CFMachPortRef native = NULL;
kern_return_t ret;
mach_port_t bs, mp;
task_get_bootstrap_port(mach_task_self(), &bs);
// NOTE: bootstrap_check_in always yields +1 receive-right
ret = bootstrap_check_in(bs, (char *)utfname, &mp); /* If we're started by launchd or the old mach_init */
if (ret == KERN_SUCCESS) {
ret = mach_port_insert_right(mach_task_self(), mp, mp, MACH_MSG_TYPE_MAKE_SEND);
if (KERN_SUCCESS == ret) {
CFMachPortContext ctx = {0, ms, NULL, NULL, NULL};
native = CFMachPortCreateWithPort(allocator, mp, __CFMessagePortDummyCallback, &ctx, NULL);
// at this point we have +1 SEND, +1 RECV, so we record that fact
__CFMessagePortSetExtraMachRef(ms);
} else {
__CFMessagePortUnlock(ms);
// balance the +1 receive-right we got from bootstrap_check_in
mach_port_mod_refs(mach_task_self(), mp, MACH_PORT_RIGHT_RECEIVE, -1);
// the insert failed, so we don't need to decrement send right here
CFAllocatorDeallocate(kCFAllocatorSystemDefault, utfname);
CFRelease(name);
return false;
}
}
if (!native) {
CFMachPortContext ctx = {0, ms, NULL, NULL, NULL};
native = CFMachPortCreate(allocator, __CFMessagePortDummyCallback, &ctx, NULL);
if (!native) {
__CFMessagePortUnlock(ms);
CFAllocatorDeallocate(kCFAllocatorSystemDefault, utfname);
CFRelease(name);
return false;
}
mp = CFMachPortGetPort(native);
}
CFMachPortSetInvalidationCallBack(native, __CFMessagePortInvalidationCallBack);
ms->_port = native;
if (NULL != oldPort && oldPort != native) {
if (previousNameHadExtraRef) {
// this code is known to be incorrect when ms->_dispatchSource is non-null, we prevent this above, but just to be sure we're not about to do something bad we assert
assert(ms->_dispatchSource == NULL);
// this is one of the reasons we are deprecating this API
mach_port_t const oldmp = CFMachPortGetPort(oldPort);
mach_port_mod_refs(mach_task_self(), oldmp, MACH_PORT_RIGHT_RECEIVE, -1);
mach_port_deallocate(mach_task_self(), oldmp);
}
CFMachPortInvalidate(oldPort);
CFRelease(oldPort);
}
os_unfair_lock_lock(&__CFAllMessagePortsLock);
// This relocking without checking to see if something else has grabbed
// that name in the cache is rather suspect, but what would that even
// mean has happened? We'd expect the bootstrap_* calls above to have
// failed for this one and not gotten this far, or failed for all of the
// other simultaneous attempts to get the name (and having succeeded for
// this one, gotten here). So we're not going to try very hard here
// with the thread-safety.
if (NULL == __CFAllLocalMessagePorts) {
__CFAllLocalMessagePorts = CFDictionaryCreateMutable(kCFAllocatorSystemDefault, 0, &kCFTypeDictionaryKeyCallBacks, NULL);
}
if (NULL != ms->_name) {
CFDictionaryRemoveValue(__CFAllLocalMessagePorts, ms->_name);
CFRelease(ms->_name);
}
ms->_name = name; // consumes the +1 from sanitize above
CFDictionaryAddValue(__CFAllLocalMessagePorts, name, ms);
os_unfair_lock_unlock(&__CFAllMessagePortsLock);
}
else if (name) {
// if setting the same name on the message port, then avoid leak
CFRelease(name);
}
__CFMessagePortUnlock(ms);
CFAllocatorDeallocate(kCFAllocatorSystemDefault, utfname);
return true;
}
void CFMessagePortGetContext(CFMessagePortRef ms, CFMessagePortContext *context) {
CF_ASSERT_TYPE(_kCFRuntimeIDCFMessagePort, ms);
//#warning CF: assert that this is a local port
CFAssert1(0 == context->version, __kCFLogAssertion, "%s(): context version not initialized to 0", __PRETTY_FUNCTION__);
memmove(context, &ms->_context, sizeof(CFMessagePortContext));
}
void CFMessagePortInvalidate(CFMessagePortRef ms) {
CF_ASSERT_TYPE_OR_NULL(_kCFRuntimeIDCFMessagePort, ms);
if (ms == NULL) {
return;
}
if (!__CFMessagePortIsDeallocing(ms)) {
CFRetain(ms);
}
__CFMessagePortLock(ms);
if (__CFMessagePortIsValid(ms)) {
if (ms->_dispatchSource) {
dispatch_source_cancel(ms->_dispatchSource);
ms->_dispatchSource = NULL;
ms->_dispatchQ = NULL;
}
CFMessagePortInvalidationCallBack callout = ms->_icallout;
CFRunLoopSourceRef source = ms->_source;
CFMachPortRef replyPort = ms->_replyPort;
CFMachPortRef port = ms->_port;
CFStringRef name = ms->_name;
void *info = NULL;
__CFMessagePortUnsetValid(ms);
if (!__CFMessagePortIsRemote(ms)) {
info = ms->_context.info;
ms->_context.info = NULL;
}
ms->_source = NULL;
ms->_replyPort = NULL;
ms->_port = NULL;
__CFMessagePortUnlock(ms);
os_unfair_lock_lock(&__CFAllMessagePortsLock);
if (0 == ms->_perPID && NULL != name && NULL != (__CFMessagePortIsRemote(ms) ? __CFAllRemoteMessagePorts : __CFAllLocalMessagePorts)) {
CFDictionaryRemoveValue(__CFMessagePortIsRemote(ms) ? __CFAllRemoteMessagePorts : __CFAllLocalMessagePorts, name);
}
os_unfair_lock_unlock(&__CFAllMessagePortsLock);
if (NULL != callout) {
callout(ms, info);
}
if (!__CFMessagePortIsRemote(ms) && NULL != ms->_context.release) {
ms->_context.release(info);
}
if (NULL != source) {
CFRunLoopSourceInvalidate(source);
CFRelease(source);
}
if (NULL != replyPort) {
CFMachPortInvalidate(replyPort);
CFRelease(replyPort);
}
if (NULL != port) {
mach_port_t const mp = CFMachPortGetPort(port);
if (__CFMessagePortIsRemote(ms)) {
_cfmp_record_deallocation(_CFMPLifetimeClientCFMessagePort, mp, true /*doSend*/, false /*doReceive*/);
}
// We already know we're going invalid, don't need this callback
// anymore; plus, this solves a reentrancy deadlock; also, this
// must be done before the deallocate of the Mach port, to
// avoid a race between the notification message which could be
// handled in another thread, and this NULL'ing out.
CFMachPortSetInvalidationCallBack(port, NULL);
if (__CFMessagePortExtraMachRef(ms)) {
_cfmp_record_deallocation(_CFMPLifetimeClientCFMessagePort, mp, true /*doSend*/, true /*doReceive*/);
}
CFMachPortInvalidate(port);
CFRelease(port);
}
} else {
__CFMessagePortUnlock(ms);
}
if (!__CFMessagePortIsDeallocing(ms)) {
CFRelease(ms);
}
}
Boolean CFMessagePortIsValid(CFMessagePortRef ms) {
CF_ASSERT_TYPE(_kCFRuntimeIDCFMessagePort, ms);
if (!__CFMessagePortIsValid(ms)) return false;
CFRetain(ms);
if (NULL != ms->_port && !CFMachPortIsValid(ms->_port)) {
CFMessagePortInvalidate(ms);
CFRelease(ms);
return false;
}
if (NULL != ms->_replyPort && !CFMachPortIsValid(ms->_replyPort)) {
CFMessagePortInvalidate(ms);
CFRelease(ms);
return false;
}
CFRelease(ms);
return true;
}
CFMessagePortInvalidationCallBack CFMessagePortGetInvalidationCallBack(CFMessagePortRef ms) {
CF_ASSERT_TYPE(_kCFRuntimeIDCFMessagePort, ms);
return ms->_icallout;
}
void CFMessagePortSetInvalidationCallBack(CFMessagePortRef ms, CFMessagePortInvalidationCallBack callout) {
CF_ASSERT_TYPE(_kCFRuntimeIDCFMessagePort, ms);
if (!__CFMessagePortIsValid(ms) && NULL != callout) {
callout(ms, ms->_context.info);
} else {
ms->_icallout = callout;
}
}
static void __CFMessagePortReplyCallBack(CFMachPortRef port, void *msg, CFIndex size, void *info) {
CFMessagePortRef ms = info;
mach_msg_base_t *msgp = msg;
mach_msg_base_t *replymsg;
__CFMessagePortLock(ms);
if (!__CFMessagePortIsValid(ms)) {
__CFMessagePortUnlock(ms);
return;
}
int32_t byteslen = 0;
Boolean wayTooSmall = size < sizeof(mach_msg_header_t) || size < MSGP_SIZE(msgp) || msgp->header.msgh_size < MSGP_SIZE(msgp);
Boolean invalidMagic = false;
Boolean invalidComplex = false;
Boolean wayTooBig = false;
if (!wayTooSmall) {
invalidMagic = ((MSGP_INFO(msgp, magic) != MAGIC) && (CFSwapInt32(MSGP_INFO(msgp, magic)) != MAGIC));
invalidComplex = (msgp->header.msgh_bits & MACH_MSGH_BITS_COMPLEX) && ((1 != msgp->body.msgh_descriptor_count) || MSGP_GET(msgp, ool).type != MACH_MSG_OOL_DESCRIPTOR);
wayTooBig = ((int32_t)MSGP_SIZE(msgp) + __CFMessagePortMaxInlineBytes) < msgp->header.msgh_size; // also less than a 32-bit signed int can hold
}
Boolean wrongSize = false;
if (!(invalidComplex || wayTooBig || wayTooSmall)) {
byteslen = CFSwapInt32LittleToHost(MSGP_INFO(msgp, byteslen));
wrongSize = (byteslen < -1) || (__CFMessagePortMaxDataSize < byteslen);
if (msgp->header.msgh_bits & MACH_MSGH_BITS_COMPLEX) {
wrongSize = wrongSize || (MSGP_GET(msgp, ool).size != byteslen);
} else {
wrongSize = wrongSize || ((int32_t)msgp->header.msgh_size - (int32_t)MSGP_SIZE(msgp) < byteslen);
}
}
Boolean invalidMsgID = wayTooSmall ? false : ((0 <= MSGP_INFO(msgp, convid)) && (MSGP_INFO(msgp, convid) <= INT32_MAX)); // conversation id
if (invalidMagic || invalidComplex || wayTooBig || wayTooSmall || wrongSize || invalidMsgID) {
CFLog(kCFLogLevelWarning, CFSTR("*** CFMessagePort: dropping corrupt reply Mach message (0b%d%d%d%d%d%d)"), invalidMagic, invalidComplex, wayTooBig, wayTooSmall, wrongSize, invalidMsgID);
mach_msg_destroy((mach_msg_header_t *)msgp);
__CFMessagePortUnlock(ms);
return;
}
if (CFDictionaryContainsKey(ms->_replies, (void *)(uintptr_t)MSGP_INFO(msgp, convid))) {
CFTypeRef reply = NULL;
replymsg = (mach_msg_base_t *)msg;
if (!(replymsg->header.msgh_bits & MACH_MSGH_BITS_COMPLEX)) {
uintptr_t msgp_extent = (uintptr_t)((uint8_t *)msgp + msgp->header.msgh_size);
uintptr_t data_extent = (uintptr_t)((uint8_t *)&(MSGP_INFO(replymsg, bytes)) + byteslen);
if (byteslen < 0) byteslen = 0; // from here on, treat negative same as zero -- this is historical behavior: a NULL return from the callback on the other side results in empty data to the original requestor
if (0 <= byteslen && data_extent <= msgp_extent) {
reply = CFDataCreate(kCFAllocatorSystemDefault, MSGP_INFO(replymsg, bytes), byteslen);
} else {
reply = CFRetain(kCFBooleanFalse); // means NULL data
}
} else {
//#warning CF: should create a no-copy data here that has a custom VM-freeing allocator, and not vm_dealloc here
reply = CFDataCreate(kCFAllocatorSystemDefault, MSGP_GET(replymsg, ool).address, MSGP_GET(replymsg, ool).size);
vm_deallocate(mach_task_self(), (vm_address_t)MSGP_GET(replymsg, ool).address, MSGP_GET(replymsg, ool).size);
}
CFDictionarySetValue(ms->_replies, (void *)(uintptr_t)MSGP_INFO(msgp, convid), reply);
CFRelease(reply);
} else { /* discard message */
if (msgp->header.msgh_bits & MACH_MSGH_BITS_COMPLEX) {
vm_deallocate(mach_task_self(), (vm_address_t)MSGP_GET(msgp, ool).address, MSGP_GET(msgp, ool).size);
}
}
__CFMessagePortUnlock(ms);
}
SInt32 CFMessagePortSendRequest(CFMessagePortRef remote, SInt32 msgid, CFDataRef data, CFTimeInterval sendTimeout, CFTimeInterval rcvTimeout, CFStringRef replyMode, CFDataRef *returnDatap) {
CF_ASSERT_TYPE(_kCFRuntimeIDCFMessagePort, remote);
mach_msg_base_t *sendmsg;
CFRunLoopRef currentRL = CFRunLoopGetCurrent();
CFRunLoopSourceRef source = NULL;
CFTypeRef reply = NULL;
uint64_t termTSR;
uint32_t sendOpts = 0, sendTimeOut = 0;
int32_t desiredReply;
Boolean didRegister = false;
kern_return_t ret;
//#warning CF: This should be an assert
// if (!__CFMessagePortIsRemote(remote)) return -999;
if (data && __CFMessagePortMaxDataSize < CFDataGetLength(data)) {
CFLog(kCFLogLevelWarning, CFSTR("*** CFMessagePortSendRequest: CFMessagePort cannot send more than %lu bytes of data"), __CFMessagePortMaxDataSize);
return kCFMessagePortTransportError;
}
__CFMessagePortLock(remote);
if (!__CFMessagePortIsValid(remote)) {
__CFMessagePortUnlock(remote);
return kCFMessagePortIsInvalid;
}
CFRetain(remote); // retain during run loop to avoid invalidation causing freeing
if (NULL == remote->_replyPort) {
CFMachPortContext context;
context.version = 0;
context.info = remote;
context.retain = (const void *(*)(const void *))CFRetain;
context.release = (void (*)(const void *))CFRelease;
context.copyDescription = (CFStringRef (*)(const void *))__CFMessagePortCopyDescription;
remote->_replyPort = CFMachPortCreate(CFGetAllocator(remote), __CFMessagePortReplyCallBack, &context, NULL);
}
remote->_convCounter++;
desiredReply = -remote->_convCounter;
sendmsg = __CFMessagePortCreateMessage(false, CFMachPortGetPort(remote->_port), (replyMode != NULL ? CFMachPortGetPort(remote->_replyPort) : MACH_PORT_NULL), -desiredReply, msgid, (data ? CFDataGetBytePtr(data) : NULL), (data ? CFDataGetLength(data) : -1));
if (!sendmsg) {
__CFMessagePortUnlock(remote);
CFRelease(remote);
return kCFMessagePortTransportError;
}
if (replyMode != NULL) {
CFDictionarySetValue(remote->_replies, (void *)(uintptr_t)desiredReply, kCFNull);
source = CFMachPortCreateRunLoopSource(CFGetAllocator(remote), remote->_replyPort, -100);
didRegister = !CFRunLoopContainsSource(currentRL, source, replyMode);
if (didRegister) {
CFRunLoopAddSource(currentRL, source, replyMode);
}
}
if (sendTimeout < 10.0*86400) {
// anything more than 10 days is no timeout!
sendOpts = MACH_SEND_TIMEOUT;
sendTimeout *= 1000.0;
if (sendTimeout < 1.0) sendTimeout = 0.0;
sendTimeOut = (uint32_t)floor(sendTimeout);
}
__CFMessagePortUnlock(remote);
ret = mach_msg((mach_msg_header_t *)sendmsg, MACH_SEND_MSG|sendOpts, sendmsg->header.msgh_size, 0, MACH_PORT_NULL, sendTimeOut, MACH_PORT_NULL);
__CFMessagePortLock(remote);
if (KERN_SUCCESS != ret) {
// need to deallocate the send-once right that might have been created
if (replyMode != NULL &&
(ret == MACH_SEND_INVALID_DEST || ret == MACH_SEND_INTERRUPTED || ret == MACH_SEND_TIMED_OUT) // [55207069, 39359253] it is only valid to clean cleaup the local port for these two return values; to do otherwise is unsafe/undefined-behavior
) {
mach_port_t port = ((mach_msg_header_t *)sendmsg)->msgh_local_port;
if (MACH_PORT_VALID(port)) {
if (MACH_MSGH_BITS_LOCAL(((mach_msg_header_t *)sendmsg)->msgh_bits) == MACH_MSG_TYPE_MOVE_SEND_ONCE) {
/* destroy the send-once right */
(void) mach_port_deallocate(mach_task_self(), port);
((mach_msg_header_t *)sendmsg)->msgh_local_port = MACH_PORT_NULL;
}
}
}
if (didRegister) {
CFRunLoopRemoveSource(currentRL, source, replyMode);
}
if (source) CFRelease(source);
__CFMessagePortUnlock(remote);
CFAllocatorDeallocate(kCFAllocatorSystemDefault, sendmsg);
CFRelease(remote);
return (MACH_SEND_TIMED_OUT == ret) ? kCFMessagePortSendTimeout : kCFMessagePortTransportError;
}
__CFMessagePortUnlock(remote);
CFAllocatorDeallocate(kCFAllocatorSystemDefault, sendmsg);
if (replyMode == NULL) {
CFRelease(remote);
return kCFMessagePortSuccess;
}
_CFMachPortInstallNotifyPort(currentRL, replyMode);
termTSR = mach_absolute_time() + __CFTimeIntervalToTSR(rcvTimeout);
for (;;) {
CFRunLoopRunInMode(replyMode, __CFTimeIntervalUntilTSR(termTSR), true);
// warning: what, if anything, should be done if remote is now invalid?
reply = CFDictionaryGetValue(remote->_replies, (void *)(uintptr_t)desiredReply);
if (!(NULL == reply || kCFNull == reply) || termTSR < mach_absolute_time()) {
break;
}
if (!CFMessagePortIsValid(remote)) {
// no reason that reply port alone should go invalid so we don't check for that
break;
}
}
// Should we uninstall the notify port? A complex question...
if (didRegister) {
CFRunLoopRemoveSource(currentRL, source, replyMode);
}
if (source) CFRelease(source);
// kCFNull is the placeholder for a reply mode
if (NULL == reply || kCFNull == reply) {
CFDictionaryRemoveValue(remote->_replies, (void *)(uintptr_t)desiredReply);
CFRelease(remote);
return CFMessagePortIsValid(remote) ? kCFMessagePortReceiveTimeout : kCFMessagePortBecameInvalidError;
}
if (NULL != returnDatap) {
// kCFBooleanFalse is the placeholder for a null data
*returnDatap = (kCFBooleanFalse == reply) ? NULL : CFRetain((CFDataRef)reply);
}
CFDictionaryRemoveValue(remote->_replies, (void *)(uintptr_t)desiredReply);
CFRelease(remote);
return kCFMessagePortSuccess;
}
static mach_port_t __CFMessagePortGetPort(void *info) {
CFMessagePortRef ms = info;
if (!ms->_port && __CFMessagePortIsValid(ms)) CFLog(kCFLogLevelWarning, CFSTR("*** Warning: A local CFMessagePort (%p) is being put in a run loop or dispatch queue, but it has not been named yet, so this will be a no-op and no messages are going to be received, even if named later."), info);
return ms->_port ? CFMachPortGetPort(ms->_port) : MACH_PORT_NULL;
}
static void *__CFMessagePortPerform(void *msg, CFIndex size, CFAllocatorRef allocator, void *info) {
CFMessagePortRef ms = info;
mach_msg_base_t *msgp = msg;
mach_msg_base_t *replymsg = NULL;
void *context_info;
void (*context_release)(const void *);
CFDataRef returnData, data = NULL;
void *return_bytes = NULL;
CFIndex return_len = -1;
int32_t msgid;
__CFMessagePortLock(ms);
if (!__CFMessagePortIsValid(ms)) {
__CFMessagePortUnlock(ms);
return NULL;
}
if (NULL != ms->_context.retain) {
context_info = (void *)ms->_context.retain(ms->_context.info);
context_release = ms->_context.release;
} else {
context_info = ms->_context.info;
context_release = NULL;