tree 8bd643348c44f9d19f6e719b6197f33f121aa9a5
parent fce6971fe3673e8269414188fda0ce3b28b5cf03
author Holger Hans Peter Freyther <holger@moiji-mobile.com> 1433773695 +0200
committer Holger Hans Peter Freyther <holger@moiji-mobile.com> 1435731400 +0200

nat: Send 16 bytes of rand to the BSC and remember it

Generate 16 byte of random data to be used for A3A8 by
the BSC in the response. We can't know which BSC it is
at this point and I don't want to send another message
once the token has been received so always send the data
with an undefined code. The old BSCs don't parse the
message and will happily ignore the RAND.

/dev/urandom can give short reads on Linux so loop
around it until the bytes have been read from the kernel.