java - Determining Android VPN Interface/IP? -

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i'm trying determine name of pptp vpn interface in android can list bind-able interface in application. since there no vpn api in android -- figured use straight java find it.

when standard java list of interfaces, ie.

arraylist<networkinterface>  allinterfaces = collections.list(networkinterface.getnetworkinterfaces());

i see few interesting things:

when phone on 802.11x wifi

  • tiwlan0 (the wifi interface)
  • ppp0 (the vpn)

when phone on verizon only

  • ppp0 (the vpn, usually)
  • ppp1 (the vz network, usually)

so - need way eliminate vz interface. can networkinfo objects android api this:

connectivitymanager conman = (connectivitymanager)this.getsystemservice(context.connectivity_service); networkinfo[] infolist = conman.getallnetworkinfo();

there few problems method:

  • the vpn doesn't show up
  • the names/fields in network info objects don't correspond in java networkinterface object

the way see there's few ways eliminate vz interface interfaces list:

  1. do name (ie. if android gave me list had "ppp1" in eliminate ppp1, since android list not ever contain vpn)
  2. do ip (ie. if figure out vz ip address, eliminate interface ip using java's networkinterface object.)

unfortunately, doesn't either of options possible since names don't match , can't figure out how vz ip android os.

so -- has else tried similar? there way ask android os interfaces have ip addresses?

thanks in advance -- appreciated.

dan

ps. i'm trying avoid forcing user input valid ip range (or specific ip) bind to.

edit: 1 possible option here jni system calll android native kit. read directory listing of /dev/ , grep ppp*. assume earliest 1 3g/4g connection , latter 1 vpn.


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