getaddrinfo returns a host's address. The port is not used here. Its more like
"dnsname" to "ip" translation.
and your "http" would be looked up in /etc/services file statically. You can
set port in the struct sockaddr
struct addrinfo *addrInfos = NULL;
int port = 12345;
int res =getaddrinfo("www.myserver.com <http://www.myserver.com/>","http",
NULL, &addrInfos);
if(res==0)
{
struct addrinfo *thisAddr = addrInfos;
while(thisAddr)
{
/* you might only want IPv4 or IPv6 records */
if(thisAddr->ai_family == AF_INET)
{
struct sockaddr_in *sa = (struct sockaddr_in
*)thisAddr->ai_addr;
sa->port = htons(port);
/* here your sockaddr is usable for connections over IPv4 to
port 12345 */
}
else if(thisAddr->ai_family == AF_INET6))
{
struct sockaddr_in6 *sa6 = (struct sockaddr_in
*)thisAddr->ai_addr;
sa6->port = htons(port);
/* here your sockaddr is usable for connections over IPv6 to
port 12345 */
}
/* but there might be more servers in the list....*/
thisAddr = thisAddr->ai_next;
}
freeaddrinfo(addrInfos);
}
> On 16 Jan 2018, at 21:50, Carl Hoefs <newsli...@autonomy.caltech.edu> wrote:
>
>
>> On Jan 16, 2018, at 1:22 PM, Carl Hoefs <newsli...@autonomy.caltech.edu
>> <mailto:newsli...@autonomy.caltech.edu>> wrote:
>>
>>
>>> On Jan 16, 2018, at 11:05 AM, Jens Alfke <j...@mooseyard.com
>>> <mailto:j...@mooseyard.com>> wrote:
>>>
>>>> On Jan 16, 2018, at 2:11 AM, Quinn The Eskimo! <eski...@apple.com
>>>> <mailto:eski...@apple.com>> wrote:
>>>>
>>>> The fact you’re using a legacy API like this implies that you’re not
>>>> IPv6-compatible. To can learn more about this is my “Supporting IPv6-only
>>>> Networks” pinned post on DevForums.
>>>>
>>>> <https://forums.developer.apple.com/message/136166#136166
>>>> <https://forums.developer.apple.com/message/136166#136166>>
>>>
>>> According to Stuart Cheshire(?)’s talk at a recent WWDC, some cell carriers
>>> have switched their data networks over to IPV6-_only_. This may be the
>>> cause of the problem. Even if gethostbyname is able to retrieve an IPv4
>>> address for your server, your device would be unable to send packets to it
>>> because there’s no IPv4 router upstream.
>>
>> Jens, Quinn,
>>
>> I have verified that I can indeed access the server via cell data using
>> NSURLSessionDataTask & friends. So yes, it appears that trying to go through
>> IPV6-only networks using IPV4 APIs doesn’t work very well…
>
> Okay, I’ve been looking around for a temporary stop-gap measure for the time
> of being, and I think getaddrinfo() may work.
>
> The problem I’m having is getting getaddrinfo() to accept a hostname with a
> port number specification:
>
> struct addrinfo hints, *res, *res0;
> int error;
> int s;
> const char *cause = NULL;
>
> memset(&hints, 0, sizeof(hints));
> hints.ai_family = PF_UNSPEC;
> hints.ai_socktype = SOCK_STREAM;
> error = getaddrinfo(“www.myserver.com:12345
> <http://www.myserver.com:12345/>", "http", &hints, &res0);
>
> The above call to getaddrinfo() returns "nodename nor servname provided, or
> not known”. It works (and I can connect) if I don’t specify the port number
> (but it connects to the wrong server, of course).
>
> Is there a way to use getaddrinfo() with a port number?
>
> -Carl
>
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