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Will the NAT64(IPv6-Only Networks) does not support ? #405

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tanshio opened this issue Feb 7, 2016 · 8 comments
Closed

Will the NAT64(IPv6-Only Networks) does not support ? #405

tanshio opened this issue Feb 7, 2016 · 8 comments

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@tanshio
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tanshio commented Feb 7, 2016

Hi.

I use GCDAsyncSoclet.
Will the NAT64(IPv6-Only Networks) does not support ?
I did the work in accordance with the procedure.

719_your_app_and_next_generation_networks_pdf
link

But can't move CocoaAsyncSocket.

[socket connectToHost:SERVER onPort:PORT error:&err]

lost connect Error Domain=NSPOSIXErrorDomain Code=51 "Network is unreachable" UserInfo={NSLocalizedDescription=Network is unreachable, NSLocalizedFailureReason=Error in connect() function}

Won't you please,help me.
@ogkent
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ogkent commented Feb 9, 2016

Set IPv4PreferredOverIPv6 = NO. See issue #315 for more info.

@tanshio
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tanshio commented Feb 10, 2016

Thanks.

IPv4PreferredOverIPv6 = NO

It was already set.

But,IP Address can't work.

Domain
[socket2 connectToHost:@"example.com" onPort:8084 error:&err]

Log

GCDAsyncSocket: Dispatching DNS lookup...
GCDAsyncSocket: lookupHost:port:error:
GCDAsyncSocket: readDataWithTimeout:buffer:bufferOffset:maxLength:tag:
GCDAsyncSocket: maybeDequeueRead
GCDAsyncSocket: lookup:didSucceedWithAddress4:address6:
GCDAsyncSocket: connectWithAddress4:address6:error:
GCDAsyncSocket: IPv4: xxx.xxx.xxx.xxx:8084
GCDAsyncSocket: IPv6: xx:xxxx::xxxx:xxxx:8084
GCDAsyncSocket: Creating IPv6 socket
GCDAsyncSocket: Binding socket...

It worked.

But

IP
[socket2 connectToHost:@"xxx.xxx.xxx.xxx" onPort:8084 error:&err]

Log

GCDAsyncSocket: Dispatching DNS lookup...
GCDAsyncSocket: lookupHost:port:error:
GCDAsyncSocket: readDataWithTimeout:buffer:bufferOffset:maxLength:tag:
GCDAsyncSocket: maybeDequeueRead
GCDAsyncSocket: lookup:didSucceedWithAddress4:address6:
GCDAsyncSocket: connectWithAddress4:address6:error:
GCDAsyncSocket: IPv4: xxx.xxx.xxx.xxx:0
GCDAsyncSocket: IPv6: xx:xxxx::xxxx:xxxx:0
GCDAsyncSocket: Creating IPv6 socket
GCDAsyncSocket: Binding socket...

Port Number set 0.
Why?

@ogkent
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ogkent commented Feb 10, 2016

Looks like you're trying to use an IPv4 address. Of course IPv6 won't work. You need an IPv6 address, e.g. 2001:db8:85a3:0:0:8a2e:370:7334.

@tanshio
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tanshio commented Feb 16, 2016

Thanks.

I created method.

-(NSString *)convertHostToAddress:(NSString *)host {

    NSError *err = nil;

    NSMutableArray *addresses = [GCDAsyncSocket lookupHost:host port:0 error:&err];

    NSLog(@"address%@",addresses);

    NSData *address4 = nil;
    NSData *address6 = nil;

    for (NSData *address in addresses)
    {
        if (!address4 && [GCDAsyncSocket isIPv4Address:address])
        {
            address4 = address;
        }
        else if (!address6 && [GCDAsyncSocket isIPv6Address:address])
        {
            address6 = address;
        }
    }

    NSString *ip;

    if (address6) {
        NSLog(@"ipv6%@",[GCDAsyncSocket hostFromAddress:address6]);
        ip = [GCDAsyncSocket hostFromAddress:address6];
    }else {
        NSLog(@"ipv4%@",[GCDAsyncSocket hostFromAddress:address4]);
        ip = [GCDAsyncSocket hostFromAddress:address4];
    }

    return ip;

}

@tanshio tanshio closed this as completed Feb 16, 2016
@newacct
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newacct commented Mar 19, 2016

You shouldn't need to do that because connectToHost: already calls lookupHost:

@jadynJT
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jadynJT commented Jun 22, 2016

great

@JeroldLiu777
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JeroldLiu777 commented Nov 28, 2016 •
edited
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ok, share my answer.works for me.

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;
...

4.
+ (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

@ashishgupta301
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In the following method we get address4 and address6,
+(BOOL)connectWithAddress4:(NSData *)address4 address6:(NSData *)address6 error:(NSError **)errPtr

so not working for IPV4. Working fine with IPV6

Any idea about it?

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6 participants
@newacct @ogkent @tanshio @jadynJT @ashishgupta301 @JeroldLiu777