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RCTSRWebSocket.m
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//
// Copyright 2012 Square Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#import "RCTSRWebSocket.h"
#import <Availability.h>
#import <Endian.h>
#import <Security/SecRandom.h>
#import <CommonCrypto/CommonDigest.h>
#import <React/RCTAssert.h>
#import <React/RCTLog.h>
typedef NS_ENUM(NSInteger, RCTSROpCode) {
RCTSROpCodeTextFrame = 0x1,
RCTSROpCodeBinaryFrame = 0x2,
// 3-7 reserved.
RCTSROpCodeConnectionClose = 0x8,
RCTSROpCodePing = 0x9,
RCTSROpCodePong = 0xA,
// B-F reserved.
};
typedef struct {
BOOL fin;
// BOOL rsv1;
// BOOL rsv2;
// BOOL rsv3;
uint8_t opcode;
BOOL masked;
uint64_t payload_length;
} frame_header;
static NSString *const RCTSRWebSocketAppendToSecKeyString = @"258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
//#define RCTSR_ENABLE_LOG
#ifdef RCTSR_ENABLE_LOG
#define RCTSRLog(format...) RCTLogInfo(format)
#else
#define RCTSRLog(...) do { } while (0)
#endif
// This is a hack, and probably not optimal
static inline int32_t validate_dispatch_data_partial_string(NSData *data)
{
static const int maxCodepointSize = 3;
for (int i = 0; i < maxCodepointSize; i++) {
NSString *str = [[NSString alloc] initWithBytesNoCopy:(char *)data.bytes length:data.length - i encoding:NSUTF8StringEncoding freeWhenDone:NO];
if (str) {
return (int32_t)data.length - i;
}
}
return -1;
}
@interface NSData (RCTSRWebSocket)
@property (nonatomic, readonly, copy) NSString *stringBySHA1ThenBase64Encoding;
@end
@interface NSString (RCTSRWebSocket)
@property (nonatomic, readonly, copy) NSString *stringBySHA1ThenBase64Encoding;
@end
@interface NSURL (RCTSRWebSocket)
// The origin isn't really applicable for a native application.
// So instead, just map ws -> http and wss -> https.
@property (nonatomic, readonly, copy) NSString *RCTSR_origin;
@end
@interface _RCTSRRunLoopThread : NSThread
@property (nonatomic, readonly) NSRunLoop *runLoop;
@end
static NSString *newSHA1String(const char *bytes, size_t length)
{
uint8_t md[CC_SHA1_DIGEST_LENGTH];
assert(length >= 0);
assert(length <= UINT32_MAX);
CC_SHA1(bytes, (CC_LONG)length, md);
NSData *data = [NSData dataWithBytes:md length:CC_SHA1_DIGEST_LENGTH];
return [data base64EncodedStringWithOptions:0];
}
@implementation NSData (RCTSRWebSocket)
- (NSString *)stringBySHA1ThenBase64Encoding;
{
return newSHA1String(self.bytes, self.length);
}
@end
@implementation NSString (RCTSRWebSocket)
- (NSString *)stringBySHA1ThenBase64Encoding;
{
return newSHA1String(self.UTF8String, self.length);
}
@end
NSString *const RCTSRWebSocketErrorDomain = @"RCTSRWebSocketErrorDomain";
NSString *const RCTSRHTTPResponseErrorKey = @"HTTPResponseStatusCode";
// Returns number of bytes consumed. Returning 0 means you didn't match.
// Sends bytes to callback handler;
typedef size_t (^stream_scanner)(NSData *collected_data);
typedef void (^data_callback)(RCTSRWebSocket *webSocket, NSData *data);
@interface RCTSRIOConsumer : NSObject
@property (nonatomic, copy, readonly) stream_scanner consumer;
@property (nonatomic, copy, readonly) data_callback handler;
@property (nonatomic, assign) size_t bytesNeeded;
@property (nonatomic, assign, readonly) BOOL readToCurrentFrame;
@property (nonatomic, assign, readonly) BOOL unmaskBytes;
@end
// This class is not thread-safe, and is expected to always be run on the same queue.
@interface RCTSRIOConsumerPool : NSObject
- (instancetype)initWithBufferCapacity:(NSUInteger)poolSize NS_DESIGNATED_INITIALIZER;
- (RCTSRIOConsumer *)consumerWithScanner:(stream_scanner)scanner handler:(data_callback)handler bytesNeeded:(size_t)bytesNeeded readToCurrentFrame:(BOOL)readToCurrentFrame unmaskBytes:(BOOL)unmaskBytes;
- (void)returnConsumer:(RCTSRIOConsumer *)consumer;
@end
@interface RCTSRWebSocket () <NSStreamDelegate>
@property (nonatomic, assign) RCTSRReadyState readyState;
@property (nonatomic, strong) NSOperationQueue *delegateOperationQueue;
@property (nonatomic, strong) dispatch_queue_t delegateDispatchQueue;
@end
@implementation RCTSRWebSocket
{
NSInteger _webSocketVersion;
NSOperationQueue *_delegateOperationQueue;
dispatch_queue_t _delegateDispatchQueue;
dispatch_queue_t _workQueue;
NSMutableArray<RCTSRIOConsumer *> *_consumers;
NSInputStream *_inputStream;
NSOutputStream *_outputStream;
NSMutableData *_readBuffer;
NSUInteger _readBufferOffset;
NSMutableData *_outputBuffer;
NSUInteger _outputBufferOffset;
uint8_t _currentFrameOpcode;
size_t _currentFrameCount;
size_t _readOpCount;
uint32_t _currentStringScanPosition;
NSMutableData *_currentFrameData;
NSString *_closeReason;
NSString *_secKey;
BOOL _pinnedCertFound;
uint8_t _currentReadMaskKey[4];
size_t _currentReadMaskOffset;
BOOL _consumerStopped;
BOOL _closeWhenFinishedWriting;
BOOL _failed;
BOOL _secure;
NSURLRequest *_urlRequest;
CFHTTPMessageRef _receivedHTTPHeaders;
BOOL _sentClose;
BOOL _didFail;
int _closeCode;
BOOL _isPumping;
BOOL _cleanupScheduled;
NSMutableSet<NSArray *> *_scheduledRunloops;
// We use this to retain ourselves.
__strong RCTSRWebSocket *_selfRetain;
NSArray<NSString *> *_requestedProtocols;
RCTSRIOConsumerPool *_consumerPool;
}
- (instancetype)initWithURLRequest:(NSURLRequest *)request protocols:(NSArray<NSString *> *)protocols
{
RCTAssertParam(request);
if ((self = [super init])) {
_url = request.URL;
_urlRequest = request;
_requestedProtocols = [protocols copy];
[self _RCTSR_commonInit];
}
return self;
}
RCT_NOT_IMPLEMENTED(- (instancetype)init)
- (instancetype)initWithURLRequest:(NSURLRequest *)request;
{
return [self initWithURLRequest:request protocols:nil];
}
- (instancetype)initWithURL:(NSURL *)URL;
{
return [self initWithURL:URL protocols:nil];
}
- (instancetype)initWithURL:(NSURL *)URL protocols:(NSArray<NSString *> *)protocols;
{
NSMutableURLRequest *request;
if (URL) {
// Build a mutable request so we can fill the cookie header.
request = [NSMutableURLRequest requestWithURL:URL];
// We load cookies from sharedHTTPCookieStorage (shared with XHR and
// fetch). To get HTTPS-only cookies for wss URLs, replace wss with https
// in the URL.
NSURLComponents *components = [NSURLComponents componentsWithURL:URL resolvingAgainstBaseURL:true];
if ([components.scheme isEqualToString:@"wss"]) {
components.scheme = @"https";
}
// Load and set the cookie header.
NSArray<NSHTTPCookie *> *cookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookiesForURL:components.URL];
[request setAllHTTPHeaderFields:[NSHTTPCookie requestHeaderFieldsWithCookies:cookies]];
}
return [self initWithURLRequest:request protocols:protocols];
}
- (void)_RCTSR_commonInit;
{
NSString *scheme = _url.scheme.lowercaseString;
assert([scheme isEqualToString:@"ws"] || [scheme isEqualToString:@"http"] || [scheme isEqualToString:@"wss"] || [scheme isEqualToString:@"https"]);
if ([scheme isEqualToString:@"wss"] || [scheme isEqualToString:@"https"]) {
_secure = YES;
}
_readyState = RCTSR_CONNECTING;
_consumerStopped = YES;
_webSocketVersion = 13;
_workQueue = dispatch_queue_create("com.facebook.react.SRWebSocket", DISPATCH_QUEUE_SERIAL);
// Going to set a specific on the queue so we can validate we're on the work queue
dispatch_queue_set_specific(_workQueue, (__bridge void *)self, (__bridge void *)_workQueue, NULL);
_delegateDispatchQueue = dispatch_get_main_queue();
_readBuffer = [NSMutableData new];
_outputBuffer = [NSMutableData new];
_currentFrameData = [NSMutableData new];
_consumers = [NSMutableArray new];
_consumerPool = [RCTSRIOConsumerPool new];
_scheduledRunloops = [NSMutableSet new];
[self _initializeStreams];
// default handlers
}
- (void)assertOnWorkQueue;
{
assert(dispatch_get_specific((__bridge void *)self) == (__bridge void *)_workQueue);
}
- (void)dealloc
{
_inputStream.delegate = nil;
_outputStream.delegate = nil;
[_inputStream close];
[_outputStream close];
if (_receivedHTTPHeaders) {
CFRelease(_receivedHTTPHeaders);
_receivedHTTPHeaders = NULL;
}
}
#ifndef NDEBUG
- (void)setReadyState:(RCTSRReadyState)aReadyState;
{
[self willChangeValueForKey:@"readyState"];
assert(aReadyState > _readyState);
_readyState = aReadyState;
[self didChangeValueForKey:@"readyState"];
}
#endif
- (void)open;
{
assert(_url);
RCTAssert(_readyState == RCTSR_CONNECTING, @"Cannot call -(void)open on RCTSRWebSocket more than once");
_selfRetain = self;
[self _connect];
}
// Calls block on delegate queue
- (void)_performDelegateBlock:(dispatch_block_t)block;
{
if (_delegateOperationQueue) {
[_delegateOperationQueue addOperationWithBlock:block];
} else {
assert(_delegateDispatchQueue);
dispatch_async(_delegateDispatchQueue, block);
}
}
- (void)setDelegateDispatchQueue:(dispatch_queue_t)queue;
{
_delegateDispatchQueue = queue;
}
- (BOOL)_checkHandshake:(CFHTTPMessageRef)httpMessage;
{
NSString *acceptHeader = CFBridgingRelease(CFHTTPMessageCopyHeaderFieldValue(httpMessage, CFSTR("Sec-WebSocket-Accept")));
if (acceptHeader == nil) {
return NO;
}
NSString *concattedString = [_secKey stringByAppendingString:RCTSRWebSocketAppendToSecKeyString];
NSString *expectedAccept = [concattedString stringBySHA1ThenBase64Encoding];
return [acceptHeader isEqualToString:expectedAccept];
}
- (void)_HTTPHeadersDidFinish;
{
NSInteger responseCode = CFHTTPMessageGetResponseStatusCode(_receivedHTTPHeaders);
if (responseCode >= 400) {
RCTSRLog(@"Request failed with response code %ld", responseCode);
[self _failWithError:[NSError errorWithDomain:RCTSRWebSocketErrorDomain code:2132 userInfo:@{NSLocalizedDescriptionKey:[NSString stringWithFormat:@"received bad response code from server %ld", (long)responseCode], RCTSRHTTPResponseErrorKey:@(responseCode)}]];
return;
}
if (![self _checkHandshake:_receivedHTTPHeaders]) {
[self _failWithError:[NSError errorWithDomain:RCTSRWebSocketErrorDomain code:2133 userInfo:@{NSLocalizedDescriptionKey: [NSString stringWithFormat:@"Invalid Sec-WebSocket-Accept response"]}]];
return;
}
NSString *negotiatedProtocol = CFBridgingRelease(CFHTTPMessageCopyHeaderFieldValue(_receivedHTTPHeaders, CFSTR("Sec-WebSocket-Protocol")));
if (negotiatedProtocol) {
// Make sure we requested the protocol
if ([_requestedProtocols indexOfObject:negotiatedProtocol] == NSNotFound) {
[self _failWithError:[NSError errorWithDomain:RCTSRWebSocketErrorDomain code:2133 userInfo:@{NSLocalizedDescriptionKey: [NSString stringWithFormat:@"Server specified Sec-WebSocket-Protocol that wasn't requested"]}]];
return;
}
_protocol = negotiatedProtocol;
}
self.readyState = RCTSR_OPEN;
if (!_didFail) {
[self _readFrameNew];
}
[self _performDelegateBlock:^{
if ([self.delegate respondsToSelector:@selector(webSocketDidOpen:)]) {
[self.delegate webSocketDidOpen:self];
};
}];
}
- (void)_readHTTPHeader;
{
if (_receivedHTTPHeaders == NULL) {
_receivedHTTPHeaders = CFHTTPMessageCreateEmpty(NULL, NO);
}
[self _readUntilHeaderCompleteWithCallback:^(RCTSRWebSocket *socket, NSData *data) {
CFHTTPMessageAppendBytes(self->_receivedHTTPHeaders, (const UInt8 *)data.bytes, data.length);
if (CFHTTPMessageIsHeaderComplete(self->_receivedHTTPHeaders)) {
RCTSRLog(@"Finished reading headers %@", CFBridgingRelease(CFHTTPMessageCopyAllHeaderFields(_receivedHTTPHeaders)));
[socket _HTTPHeadersDidFinish];
} else {
[socket _readHTTPHeader];
}
}];
}
- (void)didConnect
{
RCTSRLog(@"Connected");
CFHTTPMessageRef request = CFHTTPMessageCreateRequest(NULL, CFSTR("GET"), (__bridge CFURLRef)_url, kCFHTTPVersion1_1);
// Set host first so it defaults
CFHTTPMessageSetHeaderFieldValue(request, CFSTR("Host"), (__bridge CFStringRef)(_url.port ? [NSString stringWithFormat:@"%@:%@", _url.host, _url.port] : _url.host));
NSMutableData *keyBytes = [[NSMutableData alloc] initWithLength:16];
int result = SecRandomCopyBytes(kSecRandomDefault, keyBytes.length, keyBytes.mutableBytes);
assert(result == 0);
_secKey = [keyBytes base64EncodedStringWithOptions:0];
assert([_secKey length] == 24);
CFHTTPMessageSetHeaderFieldValue(request, CFSTR("Upgrade"), CFSTR("websocket"));
CFHTTPMessageSetHeaderFieldValue(request, CFSTR("Connection"), CFSTR("Upgrade"));
CFHTTPMessageSetHeaderFieldValue(request, CFSTR("Sec-WebSocket-Key"), (__bridge CFStringRef)_secKey);
CFHTTPMessageSetHeaderFieldValue(request, CFSTR("Sec-WebSocket-Version"), (__bridge CFStringRef)[NSString stringWithFormat:@"%ld", (long)_webSocketVersion]);
CFHTTPMessageSetHeaderFieldValue(request, CFSTR("Origin"), (__bridge CFStringRef)_url.RCTSR_origin);
if (_requestedProtocols) {
CFHTTPMessageSetHeaderFieldValue(request, CFSTR("Sec-WebSocket-Protocol"), (__bridge CFStringRef)[_requestedProtocols componentsJoinedByString:@", "]);
}
[_urlRequest.allHTTPHeaderFields enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
CFHTTPMessageSetHeaderFieldValue(request, (__bridge CFStringRef)key, (__bridge CFStringRef)obj);
}];
NSData *message = CFBridgingRelease(CFHTTPMessageCopySerializedMessage(request));
CFRelease(request);
[self _writeData:message];
[self _readHTTPHeader];
}
- (void)_initializeStreams;
{
assert(_url.port.unsignedIntValue <= UINT32_MAX);
uint32_t port = _url.port.unsignedIntValue;
if (port == 0) {
if (!_secure) {
port = 80;
} else {
port = 443;
}
}
NSString *host = _url.host;
CFReadStreamRef readStream = NULL;
CFWriteStreamRef writeStream = NULL;
CFStreamCreatePairWithSocketToHost(NULL, (__bridge CFStringRef)host, port, &readStream, &writeStream);
_outputStream = CFBridgingRelease(writeStream);
_inputStream = CFBridgingRelease(readStream);
if (_secure) {
NSMutableDictionary<NSString *, id> *SSLOptions = [NSMutableDictionary new];
[_outputStream setProperty:(__bridge id)kCFStreamSocketSecurityLevelNegotiatedSSL forKey:(__bridge id)kCFStreamPropertySocketSecurityLevel];
// If we're using pinned certs, don't validate the certificate chain
if (_urlRequest.RCTSR_SSLPinnedCertificates.count) {
[SSLOptions setValue:@NO forKey:(__bridge id)kCFStreamSSLValidatesCertificateChain];
}
#if DEBUG
[SSLOptions setValue:@NO forKey:(__bridge id)kCFStreamSSLValidatesCertificateChain];
RCTLogInfo(@"SocketRocket: In debug mode. Allowing connection to any root cert");
#endif
[_outputStream setProperty:SSLOptions
forKey:(__bridge id)kCFStreamPropertySSLSettings];
}
_inputStream.delegate = self;
_outputStream.delegate = self;
}
- (void)_connect;
{
if (!_scheduledRunloops.count) {
[self scheduleInRunLoop:[NSRunLoop RCTSR_networkRunLoop] forMode:NSDefaultRunLoopMode];
}
[_outputStream open];
[_inputStream open];
}
- (void)scheduleInRunLoop:(NSRunLoop *)aRunLoop forMode:(NSString *)mode;
{
[_outputStream scheduleInRunLoop:aRunLoop forMode:mode];
[_inputStream scheduleInRunLoop:aRunLoop forMode:mode];
[_scheduledRunloops addObject:@[aRunLoop, mode]];
}
- (void)unscheduleFromRunLoop:(NSRunLoop *)aRunLoop forMode:(NSString *)mode;
{
[_outputStream removeFromRunLoop:aRunLoop forMode:mode];
[_inputStream removeFromRunLoop:aRunLoop forMode:mode];
[_scheduledRunloops removeObject:@[aRunLoop, mode]];
}
- (void)close;
{
[self closeWithCode:RCTSRStatusCodeNormal reason:nil];
}
- (void)closeWithCode:(NSInteger)code reason:(NSString *)reason;
{
assert(code);
dispatch_async(_workQueue, ^{
if (self.readyState == RCTSR_CLOSING || self.readyState == RCTSR_CLOSED) {
return;
}
BOOL wasConnecting = self.readyState == RCTSR_CONNECTING;
self.readyState = RCTSR_CLOSING;
RCTSRLog(@"Closing with code %ld reason %@", code, reason);
if (wasConnecting) {
[self _disconnect];
return;
}
size_t maxMsgSize = [reason maximumLengthOfBytesUsingEncoding:NSUTF8StringEncoding];
NSMutableData *mutablePayload = [[NSMutableData alloc] initWithLength:sizeof(uint16_t) + maxMsgSize];
NSData *payload = mutablePayload;
((uint16_t *)mutablePayload.mutableBytes)[0] = EndianU16_BtoN(code);
if (reason) {
NSRange remainingRange = {0};
NSUInteger usedLength = 0;
BOOL success = [reason getBytes:(char *)mutablePayload.mutableBytes + sizeof(uint16_t) maxLength:payload.length - sizeof(uint16_t) usedLength:&usedLength encoding:NSUTF8StringEncoding options:NSStringEncodingConversionExternalRepresentation range:NSMakeRange(0, reason.length) remainingRange:&remainingRange];
assert(success);
assert(remainingRange.length == 0);
if (usedLength != maxMsgSize) {
payload = [payload subdataWithRange:NSMakeRange(0, usedLength + sizeof(uint16_t))];
}
}
[self _sendFrameWithOpcode:RCTSROpCodeConnectionClose data:payload];
});
}
- (void)_closeWithProtocolError:(NSString *)message;
{
// Need to shunt this on the _callbackQueue first to see if they received any messages
[self _performDelegateBlock:^{
[self closeWithCode:RCTSRStatusCodeProtocolError reason:message];
dispatch_async(self->_workQueue, ^{
[self _disconnect];
});
}];
}
- (void)_failWithError:(NSError *)error;
{
dispatch_async(_workQueue, ^{
if (self.readyState != RCTSR_CLOSED) {
self->_failed = YES;
[self _performDelegateBlock:^{
if ([self.delegate respondsToSelector:@selector(webSocket:didFailWithError:)]) {
[self.delegate webSocket:self didFailWithError:error];
}
}];
self.readyState = RCTSR_CLOSED;
RCTSRLog(@"Failing with error %@", error.localizedDescription);
[self _disconnect];
[self _scheduleCleanup];
}
});
}
- (void)_writeData:(NSData *)data;
{
[self assertOnWorkQueue];
if (_closeWhenFinishedWriting) {
return;
}
[_outputBuffer appendData:data];
[self _pumpWriting];
}
- (void)send:(id)data;
{
RCTAssert(self.readyState != RCTSR_CONNECTING, @"Invalid State: Cannot call send: until connection is open");
// TODO: maybe not copy this for performance
data = [data copy];
dispatch_async(_workQueue, ^{
if ([data isKindOfClass:[NSString class]]) {
[self _sendFrameWithOpcode:RCTSROpCodeTextFrame data:[(NSString *)data dataUsingEncoding:NSUTF8StringEncoding]];
} else if ([data isKindOfClass:[NSData class]]) {
[self _sendFrameWithOpcode:RCTSROpCodeBinaryFrame data:data];
} else if (data == nil) {
[self _sendFrameWithOpcode:RCTSROpCodeTextFrame data:data];
} else {
assert(NO);
}
});
}
- (void)sendPing:(NSData *)data;
{
RCTAssert(self.readyState == RCTSR_OPEN, @"Invalid State: Cannot call send: until connection is open");
// TODO: maybe not copy this for performance
data = [data copy] ?: [NSData data]; // It's okay for a ping to be empty
dispatch_async(_workQueue, ^{
[self _sendFrameWithOpcode:RCTSROpCodePing data:data];
});
}
- (void)handlePing:(NSData *)pingData;
{
// Need to pingpong this off _callbackQueue first to make sure messages happen in order
[self _performDelegateBlock:^{
dispatch_async(self->_workQueue, ^{
[self _sendFrameWithOpcode:RCTSROpCodePong data:pingData];
});
}];
}
- (void)handlePong:(NSData *)pongData;
{
RCTSRLog(@"Received pong");
[self _performDelegateBlock:^{
if ([self.delegate respondsToSelector:@selector(webSocket:didReceivePong:)]) {
[self.delegate webSocket:self didReceivePong:pongData];
}
}];
}
- (void)_handleMessage:(id)message
{
RCTSRLog(@"Received message");
[self _performDelegateBlock:^{
[self.delegate webSocket:self didReceiveMessage:message];
}];
}
static inline BOOL closeCodeIsValid(int closeCode)
{
if (closeCode < 1000) {
return NO;
}
if (closeCode >= 1000 && closeCode <= 1011) {
if (closeCode == 1004 ||
closeCode == 1005 ||
closeCode == 1006) {
return NO;
}
return YES;
}
if (closeCode >= 3000 && closeCode <= 3999) {
return YES;
}
if (closeCode >= 4000 && closeCode <= 4999) {
return YES;
}
return NO;
}
// Note from RFC:
//
// If there is a body, the first two
// bytes of the body MUST be a 2-byte unsigned integer (in network byte
// order) representing a status code with value /code/ defined in
// Section 7.4. Following the 2-byte integer the body MAY contain UTF-8
// encoded data with value /reason/, the interpretation of which is not
// defined by this specification.
- (void)handleCloseWithData:(NSData *)data;
{
size_t dataSize = data.length;
__block uint16_t closeCode = 0;
RCTSRLog(@"Received close frame");
if (dataSize == 1) {
// TODO: handle error
[self _closeWithProtocolError:@"Payload for close must be larger than 2 bytes"];
return;
} else if (dataSize >= 2) {
[data getBytes:&closeCode length:sizeof(closeCode)];
_closeCode = EndianU16_BtoN(closeCode);
if (!closeCodeIsValid(_closeCode)) {
[self _closeWithProtocolError:[NSString stringWithFormat:@"Cannot have close code of %d", _closeCode]];
return;
}
if (dataSize > 2) {
_closeReason = [[NSString alloc] initWithData:[data subdataWithRange:NSMakeRange(2, dataSize - 2)] encoding:NSUTF8StringEncoding];
if (!_closeReason) {
[self _closeWithProtocolError:@"Close reason MUST be valid UTF-8"];
return;
}
}
} else {
_closeCode = RCTSRStatusNoStatusReceived;
}
[self assertOnWorkQueue];
if (self.readyState == RCTSR_OPEN) {
[self closeWithCode:1000 reason:nil];
}
dispatch_async(_workQueue, ^{
[self _disconnect];
});
}
- (void)_disconnect;
{
[self assertOnWorkQueue];
RCTSRLog(@"Trying to disconnect");
_closeWhenFinishedWriting = YES;
[self _pumpWriting];
}
- (void)_handleFrameWithData:(NSData *)frameData opCode:(NSInteger)opcode;
{
// Check that the current data is valid UTF8
BOOL isControlFrame = (opcode == RCTSROpCodePing || opcode == RCTSROpCodePong || opcode == RCTSROpCodeConnectionClose);
if (!isControlFrame) {
[self _readFrameNew];
} else {
dispatch_async(_workQueue, ^{
[self _readFrameContinue];
});
}
switch (opcode) {
case RCTSROpCodeTextFrame: {
NSString *str = [[NSString alloc] initWithData:frameData encoding:NSUTF8StringEncoding];
if (str == nil && frameData) {
[self closeWithCode:RCTSRStatusCodeInvalidUTF8 reason:@"Text frames must be valid UTF-8"];
dispatch_async(_workQueue, ^{
[self _disconnect];
});
return;
}
[self _handleMessage:str];
break;
}
case RCTSROpCodeBinaryFrame:
[self _handleMessage:[frameData copy]];
break;
case RCTSROpCodeConnectionClose:
[self handleCloseWithData:frameData];
break;
case RCTSROpCodePing:
[self handlePing:frameData];
break;
case RCTSROpCodePong:
[self handlePong:frameData];
break;
default:
[self _closeWithProtocolError:[NSString stringWithFormat:@"Unknown opcode %ld", (long)opcode]];
// TODO: Handle invalid opcode
break;
}
}
- (void)_handleFrameHeader:(frame_header)frame_header curData:(NSData *)curData;
{
assert(frame_header.opcode != 0);
if (self.readyState != RCTSR_OPEN) {
return;
}
BOOL isControlFrame = (frame_header.opcode == RCTSROpCodePing || frame_header.opcode == RCTSROpCodePong || frame_header.opcode == RCTSROpCodeConnectionClose);
if (isControlFrame && !frame_header.fin) {
[self _closeWithProtocolError:@"Fragmented control frames not allowed"];
return;
}
if (isControlFrame && frame_header.payload_length >= 126) {
[self _closeWithProtocolError:@"Control frames cannot have payloads larger than 126 bytes"];
return;
}
if (!isControlFrame) {
_currentFrameOpcode = frame_header.opcode;
_currentFrameCount += 1;
}
if (frame_header.payload_length == 0) {
if (isControlFrame) {
[self _handleFrameWithData:curData opCode:frame_header.opcode];
} else {
if (frame_header.fin) {
[self _handleFrameWithData:_currentFrameData opCode:frame_header.opcode];
} else {
// TODO: add assert that opcode is not a control;
[self _readFrameContinue];
}
}
} else {
assert(frame_header.payload_length <= SIZE_T_MAX);
[self _addConsumerWithDataLength:(size_t)frame_header.payload_length callback:^(RCTSRWebSocket *socket, NSData *newData) {
if (isControlFrame) {
[socket _handleFrameWithData:newData opCode:frame_header.opcode];
} else {
if (frame_header.fin) {
[socket _handleFrameWithData:socket->_currentFrameData opCode:frame_header.opcode];
} else {
// TODO: add assert that opcode is not a control;
[socket _readFrameContinue];
}
}
} readToCurrentFrame:!isControlFrame unmaskBytes:frame_header.masked];
}
}
/* From RFC:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-------+-+-------------+-------------------------------+
|F|R|R|R| opcode|M| Payload len | Extended payload length |
|I|S|S|S| (4) |A| (7) | (16/64) |
|N|V|V|V| |S| | (if payload len==126/127) |
| |1|2|3| |K| | |
+-+-+-+-+-------+-+-------------+ - - - - - - - - - - - - - - - +
| Extended payload length continued, if payload len == 127 |
+ - - - - - - - - - - - - - - - +-------------------------------+
| |Masking-key, if MASK set to 1 |
+-------------------------------+-------------------------------+
| Masking-key (continued) | Payload Data |
+-------------------------------- - - - - - - - - - - - - - - - +
: Payload Data continued ... :
+ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
| Payload Data continued ... |
+---------------------------------------------------------------+
*/
static const uint8_t RCTSRFinMask = 0x80;
static const uint8_t RCTSROpCodeMask = 0x0F;
static const uint8_t RCTSRRsvMask = 0x70;
static const uint8_t RCTSRMaskMask = 0x80;
static const uint8_t RCTSRPayloadLenMask = 0x7F;
- (void)_readFrameContinue;
{
assert((_currentFrameCount == 0 && _currentFrameOpcode == 0) || (_currentFrameCount > 0 && _currentFrameOpcode > 0));
[self _addConsumerWithDataLength:2 callback:^(RCTSRWebSocket *socket, NSData *data) {
__block frame_header header = {0};
const uint8_t *headerBuffer = data.bytes;
assert(data.length >= 2);
if (headerBuffer[0] & RCTSRRsvMask) {
[socket _closeWithProtocolError:@"Server used RSV bits"];
return;
}
uint8_t receivedOpcode = (RCTSROpCodeMask &headerBuffer[0]);
BOOL isControlFrame = (receivedOpcode == RCTSROpCodePing || receivedOpcode == RCTSROpCodePong || receivedOpcode == RCTSROpCodeConnectionClose);
if (!isControlFrame && receivedOpcode != 0 && socket->_currentFrameCount > 0) {
[socket _closeWithProtocolError:@"all data frames after the initial data frame must have opcode 0"];
return;
}
if (receivedOpcode == 0 && socket->_currentFrameCount == 0) {
[socket _closeWithProtocolError:@"cannot continue a message"];
return;
}
header.opcode = receivedOpcode == 0 ? socket->_currentFrameOpcode : receivedOpcode;
header.fin = !!(RCTSRFinMask &headerBuffer[0]);
header.masked = !!(RCTSRMaskMask &headerBuffer[1]);
header.payload_length = RCTSRPayloadLenMask & headerBuffer[1];
headerBuffer = NULL;
if (header.masked) {
[socket _closeWithProtocolError:@"Client must receive unmasked data"];
}
size_t extra_bytes_needed = header.masked ? sizeof(self->_currentReadMaskKey) : 0;
if (header.payload_length == 126) {
extra_bytes_needed += sizeof(uint16_t);
} else if (header.payload_length == 127) {
extra_bytes_needed += sizeof(uint64_t);
}
if (extra_bytes_needed == 0) {
[socket _handleFrameHeader:header curData:socket->_currentFrameData];
} else {
[socket _addConsumerWithDataLength:extra_bytes_needed callback:^(RCTSRWebSocket *_socket, NSData *_data) {
size_t mapped_size = _data.length;
const void *mapped_buffer = _data.bytes;
size_t offset = 0;
if (header.payload_length == 126) {
assert(mapped_size >= sizeof(uint16_t));
uint16_t newLen = EndianU16_BtoN(*(uint16_t *)(mapped_buffer));
header.payload_length = newLen;
offset += sizeof(uint16_t);
} else if (header.payload_length == 127) {
assert(mapped_size >= sizeof(uint64_t));
header.payload_length = EndianU64_BtoN(*(uint64_t *)(mapped_buffer));
offset += sizeof(uint64_t);
} else {
assert(header.payload_length < 126 && header.payload_length >= 0);
}
if (header.masked) {
assert(mapped_size >= sizeof(self->_currentReadMaskOffset) + offset);
memcpy(_socket->_currentReadMaskKey, ((uint8_t *)mapped_buffer) + offset, sizeof(_socket->_currentReadMaskKey));
}
[_socket _handleFrameHeader:header curData:_socket->_currentFrameData];
} readToCurrentFrame:NO unmaskBytes:NO];
}
} readToCurrentFrame:NO unmaskBytes:NO];
}
- (void)_readFrameNew;
{
dispatch_async(_workQueue, ^{
self->_currentFrameData.length = 0;
self->_currentFrameOpcode = 0;
self->_currentFrameCount = 0;