1.- (BOOL)connectWithAddress4:(NSData *)address4 address6:(NSData *)address6 error:(NSError **)errPtr
{
LogTrace();
NSAssert(dispatch_get_specific(IsOnSocketQueueOrTargetQueueKey), @"Must be dispatched on socketQueue");
LogVerbose(@"IPv4: %@:%hu", [[self class] hostFromAddress:address4], [[self class] portFromAddress:address4]);
LogVerbose(@"IPv6: %@:%hu", [[self class] hostFromAddress:address6], [[self class] portFromAddress:address6]);
//add codes blow
if(address6)
{
[self setIPv6Enabled:YES];
}
……
}
2.- (void)setIPv6Enabled:(BOOL)flag
{
// Note:YES means kIPv6Disabled is OFF
dispatch_block_t block = ^{
if (flag)
config |= kPreferIPv6; //replace by this
else
config |= kIPv6Disabled;
};
......
}
3.GCDAsyncSocket.m
(BOOL)connectWithAddress4:(NSData *)address4 address6:(NSData *)address6 error:(NSError **)errPtr;
//add codes blow
...
if (address6) {
[self setIPv4PreferredOverIPv6:NO];
}
BOOL preferIPv6 = (config & kPreferIPv6) ? YES : NO;
...
(NSMutableArray *)lookupHost:(NSString *)host port:(uint16_t)port error:(NSError **)errPtr; find else if (res->ai_family == AF_INET6) branch, then replace by blow：
struct sockaddr_in6 *sockaddr = (struct sockaddr_in6 *)res->ai_addr;
in_port_t *portPtr = &sockaddr->sin6_port;
if ((portPtr != NULL) && (*portPtr == 0)) {
*portPtr = htons(port);
}
NSData *address6 = [NSData dataWithBytes:res->ai_addr length:res->ai_addrlen];
[addresses addObject:address6];
DONE
