How to get my local IP address? (using program code)

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ChrisH

Posted on: 2018/6/11 23:32 #1

Home away from home

Can anyone give hints on a simple way to find my Amiga's local IP address?

So far I only managed to get 127.0.0.1, which isn't very helpful! Other non-Amiga networking guides suggest getifaddrs() & other things which Roadshow doesn't have :(

NOTE: Since it doesn't seem clear I posted this in the Developer forum,
I am wanting to achieve this with code.

Edited by ChrisH on 2018/6/12 20:26:30

Author of the PortablE programming language.

rwo

Re: How to get my local IP address?

Posted on: 2018/6/12 0:08 #2

Not too shy to talk

well if you want to get the ip addr from a shell you can use my util rIPConfig but if you want to get it from code you can use BSD Socket library

call Queryinterface with IFQ_Address

René

“The best thing about a boolean is even if you are wrong, you are only off by a bit.”

ChrisH

Re: How to get my local IP address?

Posted on: 2018/6/12 7:01 #3

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@rwo
Thanks! QueryInterfaceTags() seems to be what I need... although it's rather poorly documented, so going to take me some time to work out how I'm supposed to use it. (e.g. "name -- Name of the interface to be queried" What "interface"? And how do I find it's name?!? e.g. "IFQ_Address (struct sockaddr *)" but how do I pass that parameter & get the return value as a tag list - using the same single data value?)

Author of the PortablE programming language.

broadblues

Re: How to get my local IP address?

Posted on: 2018/6/12 7:17 #4

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@ChrisH

You pass apointer to the struct and it will be filled in by the function.

See SDK:Examples/PPP for various usage examples.

Blender For OS4.x : Blues : Walker Broad

utri007

Re: How to get my local IP address?

Posted on: 2018/6/12 12:56 #5

Not too shy to talk

Type shownetstatus command to shell window?

K-L

Re: How to get my local IP address?

Posted on: 2018/6/12 18:38 #6

Just can't stay away

Yes : c:shownetstatus

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Ami603

Re: How to get my local IP address?

Posted on: 2018/6/12 18:46 #7

Just popping in

He meant from own program code

ChrisH

Re: How to get my local IP address?

Posted on: 2018/6/12 20:27 #8

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@all
It looks like I can get the necessary network interface name using ObtainInterfaceList()...

@broadblues
Thanks, that will probably save me a few crashes...
...but QueryInterfaceTagList() is returning False when I try to use it, so I think I must still be missing something.

Do I need to initialise the struct sockaddr? (But I tried a 'live' sockaddr, without luck.)

Edited by ChrisH on 2018/6/12 20:59:58
Edited by ChrisH on 2018/6/12 21:02:25

Author of the PortablE programming language.

broadblues

Re: How to get my local IP address?

Posted on: 2018/6/12 22:37 #9

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@ChrisH

Quote:

but QueryInterfaceTagList() is returning False when I try to use it, so I think I must still be missing something.

This bit of teh autodoc is what you missed

Quote:

RESULT
success -- 0 for success, -1 for failure; the failure code will
be stored in the 'errno' variable.

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TSK

Re: How to get my local IP address?

Posted on: 2018/6/12 22:39 #10

Just can't stay away

@ChrisH


struct List *netiflist=NULL;

struct Node *node=NULL;

struct sockaddr addr;

int32 res=0;



  SocketBase=(struct Library *)IExec->OpenLibrary("bsdsocket.library",0);

  if (SocketBase!=NULL)

  {

   ISocket=(struct SocketIFace *)IExec->GetInterface(SocketBase,"main",1,NULL);

   if (ISocket!=NULL)

   {

    netiflist=ISocket->ObtainInterfaceList();

    if (netiflist!=NULL)

    {

     node=IExec->GetHead(netiflist);

     if (node!=NULL)

     {

      while (node!=NULL)

      {

       if (node->ln_Name!=NULL)

       {

        printf("Network interface %s:\\n",node->ln_Name);

        // QueryInterfaceTags returns 0 for success, -1 for error

        res=ISocket->QueryInterfaceTags(node->ln_Name,

                                        IFQ_Address,&addr,

                                        TAG_DONE);

        if (res==0)

        {

 printf("IP: %u.%u.%u.%u\\n",(uint8)addr.sa_data[2],(uint8)addr.sa_data[3],(uint8)addr.sa_data[4],(uint8)addr.sa_data[5]);

        }

        else

        { printf("- Error: Can't query information (%ld)\\n",res); }

       }



       node=IExec->GetSucc(node);

      }

     }

     else

     {

      printf("No network interfaces found\\n");

     }



     ISocket->ReleaseInterfaceList(netiflist);

    }

    IExec->DropInterface((struct Interface *)ISocket);

   }

   IExec->CloseLibrary(SocketBase);

  }

Edit: Added while loop to the code.

Edited by TSK on 2018/6/14 18:53:50

Rock lobster bit me - so I'm here forever
X1000 + AmigaOS 4.1 FE
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ChrisH

Re: How to get my local IP address?

Posted on: 2018/6/13 18:01 #11

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@broadblues
Thanks, that was it :) . I was in a hurry, so didn't see that hidden at the bottom.

I'm not sure why anyone would call a return value "success" when True means failure & False means success. IMHO it would make much more sense to call it "error" or "failure"...

Author of the PortablE programming language.

ChrisH

Re: How to get my local IP address?

Posted on: 2018/6/13 18:05 #12

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@TSK
Your code (probably) answers my next question, which would have been:

Quote:

Is it a good idea to only use the first Network Interface returned by ObtainInterfaceList() ?

Although I suppose if you were being really picky, you'd interate through all the Network Interfaces until you got an IP Address. (I'm assuming QueryInterfaceTagList() will fail if the network interface has no IP address - I guess you'd need to test that as well. edit: Seems that ObtainInterfaceList() returns an empty list in that case.)

Edited by ChrisH on 2018/6/13 19:09:45
Edited by ChrisH on 2018/6/13 19:10:56
Edited by ChrisH on 2018/6/13 19:13:02

Author of the PortablE programming language.

TSK

Re: How to get my local IP address?

Posted on: 2018/6/14 18:55 #13

Just can't stay away

@ChrisH

I added while loop to the code in the previous post. It's possible to have multiple interfaces actually.

Rock lobster bit me - so I'm here forever
X1000 + AmigaOS 4.1 FE
"Anyone can build a fast CPU. The trick is to build a fast system." - Seymour Cray

MickJT

Re: How to get my local IP address? (using program code)

Posted on: 2018/6/15 12:36 #14

Just can't stay away

The ShowNetStatus source code is available in the Roadshow SDK if it's of any help.

Elwood

Re: How to get my local IP address? (using program code)

Posted on: 2018/6/16 10:27 #15

Just can't stay away

@ChrisH

a TCP/IP module soon to be available?

Philippe 'Elwood' FERRUCCI
Sam460ex 1.10 Ghz
http://elwoodb.free.fr

ChrisH

Re: How to get my local IP address? (using program code)

Posted on: 2018/6/17 14:03 #16

Home away from home

@Elwood
PortablE has had TCP/IP support for years (but only for AmigaOS4)...

Otherwise I wouldn't have been able to write this:
http://cshandley.co.uk/enewsreader/

Author of the PortablE programming language.

mritter0

Re: How to get my local IP address? (using program code)

Posted on: 2018/6/24 23:35 #17

Just popping in

How do you get the default gateway and DNS's?

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jabirulo

Re: How to get my local IP address? (using program code)

Posted on: 2018/6/25 11:33 #18

Just can't stay away

@mritter0

You can take a look into NetSpeedometer sources (os4depot).

/*
- Literally copied and pasted from SDK 53.20 ppp_dialer.c with very few minor changes,
rather obscure subject not documented at all

- I assume the "default gateway" to be unique in the system
*/
function void GetDefaultGateway(void)
{
...
}
...
if ( ISocket->QueryInterfaceTags( Label_p, /* it can' t be longer than 15 chars */
IFQ_Address, &AddressBuffer,
/* IFQ_DestinationAddress, &DestinationAddressBuffer, */
IFQ_NetMask, &NetMaskBuffer,
IFQ_PrimaryDNSAddress, &PrimaryDNSAddressBuffer,
IFQ_SecondaryDNSAddress, &SecondaryDNSAddressBuffer,
IFQ_AddressBindType, &AddressBindType,
/* --- */
IFQ_HardwareType, &HardwareType,
IFQ_HardwareAddressSize, &HardwareAddressSize,
IFQ_HardwareAddress, HardwareAddressText,
IFQ_BPS, &BPS,
IFQ_State, &State,
/* --- */
IFQ_GetBytesIn, &GetBytesIn,
IFQ_GetBytesOut, &GetBytesOut,
TAG_DONE ) != 0 )
{
...
strcpy( PrimaryDNSAddressText, ISocket->Inet_NtoA( PrimaryDNSAddressBuffer.sin_addr.s_addr ) );
strcpy( SecondaryDNSAddressText, ISocket->Inet_NtoA( SecondaryDNSAddressBuffer.sin_addr.s_addr ) );

mritter0

Re: How to get my local IP address? (using program code)

Posted on: 2018/6/25 17:04 #19

Just popping in

@jabirulo

That is what I have been doing, but I always get 0.0.0.0 even though I have 8.8.8.8 and 8.8.4.4 specified in Prefs->Internet->Name resolution.

In Routes I have 192.168.1.254 for Default Gateway Address. I always get 192.168.1.255. (Not sure I am looking in correct place for it).

shownetstatus gives me the correct values.

mritter0

Re: How to get my local IP address? (using program code)

Posted on: 2018/6/25 19:14 #20

Just popping in

Got it. Thanks.

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