implemented wake on lan

Limelight/Network/WakeOnLanManager.h

@@ -0,0 +1,16 @@
+//
+//  WakeOnLanManager.h
+//  Limelight
+//
+//  Created by Diego Waxemberg on 1/2/15.
+//  Copyright (c) 2015 Limelight Stream. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import "Host.h"
+
+@interface WakeOnLanManager : NSObject
+
++ (void) wakeHost:(Host*)host;
+
+@end

Limelight/Network/WakeOnLanManager.m

@@ -0,0 +1,82 @@
+//
+//  WakeOnLanManager.m
+//  Limelight
+//
+//  Created by Diego Waxemberg on 1/2/15.
+//  Copyright (c) 2015 Limelight Stream. All rights reserved.
+//
+
+#import "WakeOnLanManager.h"
+#import "Utils.h"
+#import <CoreFoundation/CoreFoundation.h>
+#import <sys/socket.h>
+#import <netinet/in.h>
+#import <arpa/inet.h>
+
+@implementation WakeOnLanManager
+
+static const int numPorts = 5;
+static const int ports[numPorts] = {7, 9, 47998, 47999, 48000};
+
++ (void) wakeHost:(Host*)host {
+    NSData* wolPayload = [WakeOnLanManager createPayload:host];
+    CFDataRef dataPayload = CFDataCreate(kCFAllocatorDefault, [wolPayload bytes], [wolPayload length]);
+    CFSocketRef wolSocket = CFSocketCreate(kCFAllocatorDefault, PF_INET, SOCK_DGRAM, IPPROTO_UDP, 0, NULL, NULL);
+    if (!wolSocket) {
+        NSLog(@"Failed to create WOL socket");
+        return;
+    }
+    NSLog(@"WOL socket created");
+    
+    struct sockaddr_in addr;
+    memset(&addr, 0, sizeof(addr));
+    addr.sin_family = AF_INET;
+    addr.sin_len = sizeof(addr);
+    
+    
+    for (int i = 0; i < 2; i++) {
+        // try all ip addresses
+        if (i == 0) {
+            inet_aton([host.localAddress UTF8String], &addr.sin_addr);
+        } else {
+            inet_aton([host.externalAddress UTF8String], &addr.sin_addr);
+        }
+
+        CFDataRef dataAddress = CFDataCreate(kCFAllocatorDefault, (unsigned char*)&addr, sizeof(addr));
+        
+        // try all ports
+        for (int j = 0; j < numPorts; j++) {
+            addr.sin_port = htons(ports[j]);
+            NSLog(@"Sending WOL packet");
+            CFSocketSendData(wolSocket, dataAddress, dataPayload, 0);
+        }
+        CFRelease(dataAddress);
+    }
+    CFRelease(dataPayload);
+}
+
++ (NSData*) createPayload:(Host*)host {
+    NSMutableData* payload = [[NSMutableData alloc] initWithCapacity:102];
+    
+    // 6 bytes of FF
+    UInt8 header = 0xFF;
+    for (int i = 0; i < 6; i++) {
+        [payload appendBytes:&header length:1];
+    }
+    
+    // 16 repitiions of MAC address
+    NSData* macAddress = [self macStringToBytes:host.mac];
+    for (int j = 0; j < 16; j++) {
+        [payload appendData:macAddress];
+    }
+    
+    return payload;
+}
+
++ (NSData*) macStringToBytes:(NSString*)mac {
+    NSString* macString = [mac stringByReplacingOccurrencesOfString:@":" withString:@""];
+    NSLog(@"MAC: %@", macString);
+    return [Utils hexToBytes:macString];
+}
+
+@end