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// SDLTCPTransport.m
//
#import "SDLTCPTransport.h"
#import "SDLLogConstants.h"
#import "SDLLogMacros.h"
#import "SDLLogManager.h"
#import "SDLHexUtility.h"
#import <errno.h>
#import <netdb.h>
#import <netinet/in.h>
#import <signal.h>
#import <stdio.h>
#import <sys/socket.h>
#import <sys/types.h>
#import <sys/wait.h>
#import <unistd.h>
NS_ASSUME_NONNULL_BEGIN
// C function forward declarations.
int call_socket(const char *hostname, const char *port);
static void TCPCallback(CFSocketRef socket, CFSocketCallBackType type, CFDataRef address, const void *data, void *info);
@interface SDLTCPTransport () {
dispatch_queue_t _sendQueue;
}
@end
@implementation SDLTCPTransport
- (instancetype)init {
if (self = [super init]) {
_sendQueue = dispatch_queue_create("com.sdl.transport.tcp.transmit", DISPATCH_QUEUE_SERIAL);
SDLLogD(@"TCP Transport initialization");
}
return self;
}
- (void)dealloc {
[self disconnect];
}
- (void)connect {
SDLLogD(@"Attemping to connect");
int sock_fd = call_socket([self.hostName UTF8String], [self.portNumber UTF8String]);
if (sock_fd < 0) {
SDLLogE(@"Server not ready, connection failed");
return;
}
CFSocketContext socketCtxt = {0, (__bridge void *)(self), NULL, NULL, NULL};
socket = CFSocketCreateWithNative(kCFAllocatorDefault, sock_fd, kCFSocketDataCallBack | kCFSocketConnectCallBack, (CFSocketCallBack)&TCPCallback, &socketCtxt);
CFRunLoopSourceRef source = CFSocketCreateRunLoopSource(kCFAllocatorDefault, socket, 0);
CFRunLoopRef loop = CFRunLoopGetCurrent();
CFRunLoopAddSource(loop, source, kCFRunLoopDefaultMode);
CFRelease(source);
}
- (void)sendData:(NSData *)msgBytes {
dispatch_async(_sendQueue, ^{
@autoreleasepool {
SDLLogBytes(msgBytes, SDLLogBytesDirectionTransmit);
CFSocketError e = CFSocketSendData(socket, NULL, (__bridge CFDataRef)msgBytes, 10000);
if (e != kCFSocketSuccess) {
NSString *errorCause = nil;
switch (e) {
case kCFSocketTimeout:
errorCause = @"Socket Timeout Error.";
break;
case kCFSocketError:
default:
errorCause = @"Socket Error.";
break;
}
SDLLogE(@"Socket send error: %@", errorCause);
}
}
});
}
- (void)disconnect {
SDLLogD(@"Disconnect connection");
if (socket != nil) {
CFSocketInvalidate(socket);
CFRelease(socket);
socket = nil;
}
}
@end
// C functions
int call_socket(const char *hostname, const char *port) {
int status, sock;
struct addrinfo hints;
struct addrinfo *servinfo;
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
//no host name?, no problem, get local host
if (hostname == nil) {
char localhost[128];
gethostname(localhost, sizeof localhost);
hostname = (const char *)&localhost;
}
//getaddrinfo setup
if ((status = getaddrinfo(hostname, port, &hints, &servinfo)) != 0) {
fprintf(stderr, "getaddrinfo error: %s\n", gai_strerror(status));
return (-1);
}
//get socket
if ((sock = socket(servinfo->ai_family, servinfo->ai_socktype, servinfo->ai_protocol)) < 0)
return (-1);
//connect
if (connect(sock, servinfo->ai_addr, servinfo->ai_addrlen) < 0) {
close(sock);
return (-1);
}
freeaddrinfo(servinfo); // free the linked-list
return (sock);
}
static void TCPCallback(CFSocketRef socket, CFSocketCallBackType type, CFDataRef address, const void *data, void *info) {
if (kCFSocketConnectCallBack == type) {
SDLTCPTransport *transport = (__bridge SDLTCPTransport *)info;
[transport.delegate onTransportConnected];
} else if (kCFSocketDataCallBack == type) {
SDLTCPTransport *transport = (__bridge SDLTCPTransport *)info;
// Check if Core disconnected from us
if (CFDataGetLength((CFDataRef)data) <= 0) {
SDLLogW(@"Remote system terminated connection, data packet length 0");
[transport.delegate onTransportDisconnected];
return;
}
// Handle the data we received
NSData *convertedData = [NSData dataWithBytes:(UInt8 *)CFDataGetBytePtr((CFDataRef)data) length:(int)CFDataGetLength((CFDataRef)data)];
SDLLogBytes(convertedData, SDLLogBytesDirectionReceive);
[transport.delegate onDataReceived:convertedData];
} else {
SDLLogW(@"Unhandled callback type: %lu", type);
}
}
NS_ASSUME_NONNULL_END
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