PureBasic Forums - English

Posted: **Wed Jun 08, 2016 3:06 am**

hello! I would like to read/save the raw 128-bit IPv6 address, so rather than converting it to a string with IPString() and back to raw Im assuming we can just read from the memory of the return value of GetClientIP() ? before we FreeIP() it

I modified the Echo client/server example that comes with PB and its (IPv6) working fine when I use "::1" localhost, but I can't get it to connect to any Internet sites for some reason - im guessing this is a problem with my system and not a bug, but can others please test?

Also if you could copy-and-paste the ShowMemoryViewer result along with an nslookup of whatever address it connected to that'd be great thankyou very much! hopefully from the memory dump the IP address location and byte order etc will be obvious

(i cant work it out from the ::1 localhost as its almost all nulls)

Code: Select all

If InitNetwork() = 0
  MessageRequester("Error", "Can't initialize the network !", 0):  End
EndIf

Port = 80
addr.s = "www.ipv6ready.org" ; "www.google.com"  "ipv6.google.com" "2a00:1450:4001:815::200e"

ConnectionID = OpenNetworkConnection(addr, Port,  #PB_Network_TCP | #PB_Network_IPv6)
If ConnectionID
  MessageRequester("PureBasic - Client", "Client connected to server...", 0)
  IP = GetClientIP(ConnectionID)
  ShowMemoryViewer(@IP,24)   ;16 bytes IPv6 + 8 in case theres a ptr
  MessageRequester("IP","Showing IP memory (but am not sure if the first field is a ptr to the data)")
  CloseNetworkConnection(ConnectionID)
  FreeIP(IP) ;required when GetClientIP is ipv6
Else
  MessageRequester("PureBasic - Client", "Can't find the server (Is it launched ?).", 0)
EndIf

Posted: **Wed Jun 08, 2016 11:02 am**

Does your ISP support ipv6 ?

Posted: **Wed Jun 08, 2016 11:05 am**

Ahhh, no I don't think so!! (i enquired a couple years ago and they didn't then) thanks, i shouldve thought of that

It's not a major problem for me though because i can still test locally, but just in regards to reading the IP address I can't quite figure it out because the memory is too tricky to work out when the address is 95% nulls lol. So if somebody could show me their ShowMemoryViewer dump using an internet-based address thatd be much appreciated!

Posted: **Wed Jun 08, 2016 4:52 pm**

I was finally able to find some valid/non-"::1" IPv6 addresses in a VM, so i was then able to confirm my suspicion/hope that to read the raw 128bit IPv6 address we just read 16 bytes from IP (before calling FreeIP(IP)), nice and easy like i hoped

Code: Select all

Structure IPv6addr
  StructureUnion
    octet.a[16]
    octetq.q[2]
  EndStructureUnion
EndStructure
 
InitNetwork()
If ExamineIPAddresses(#PB_Network_IPv6)   ;enumerate local IPv6 addresses
  Repeat
    IP = NextIPAddress()
    If IP
      Define IPv6.IPv6addr
      IPv6\octetq[0] = PeekQ(IP)
      IPv6\octetq[1] = PeekQ(IP+8)
      ShowMemoryViewer(IPv6, 16)
      MessageRequester("Next IP", IPString(IP, #PB_Network_IPv6))      
      FreeIP(IP)
    EndIf
  Until IP = 0
EndIf

its stored in the same left-to-right (big endian) byte order just like IPv4.
For example, "::1" is "0000:0000:0000:0000:0000:0000:0000:0001", with the 01 byte right-most.
It would be a nice timesaver if the PB documentation could mention these things

PureBasic Forums - English

raw 128bit IPv6 address from GetClientIP()

raw 128bit IPv6 address from GetClientIP()

Re: raw 128bit IPv6 address from GetClientIP()

Re: raw 128bit IPv6 address from GetClientIP()

Re: raw 128bit IPv6 address from GetClientIP()