packet_buffer_to_string() needs to accont for the fact that
packet->ip_bytes does not capture the full length of the packet (in
remote mode there will be layer 2 ethernet headers as well).

Change-Id: If2c95e68071545a27078141b6ba5f98cd2c46fb9

Code to print MPLS label stacks in a human-readable format matching
the script syntax:

  mpls (label 123, tc 1, [S], ttl 255) (label 456, tc 1, [S], ttl 255)

Change-Id: I706be8aab089fbad79eabde67125345330728517

Basic support for printing encapsulation headers: IPv4, IPv6, GRE.


Change-Id: I67b9e432c98a00ba2c19ac6ea25ea35592462ea9

fmemopen(3) states that buffers opened via open_memstream should be
freed after closing the associated stream.

Signed-off-by: Mike Neilsen <mneilsen@acm.org>

Initial commit for the packetdrill network stack testing tool:

  https://code.google.com/p/packetdrill/



Signed-off-by: Neal Cardwell <ncardwell@google.com>