From ece52e4915a83b23e14d8e73e5e672e3df9926fe Mon Sep 17 00:00:00 2001
From: Nico Schottelius <nico@nico-notebook.schottelius.org>
Date: Thu, 21 Mar 2019 20:36:01 +0100
Subject: [PATCH] ++ sniff-host command

---
 doc/plan.org     |  8 ++++++--
 p4app/sniff-host | 11 +++++++++++
 2 files changed, 17 insertions(+), 2 deletions(-)
 create mode 100644 p4app/sniff-host

diff --git a/doc/plan.org b/doc/plan.org
index a308f18..665d520 100644
--- a/doc/plan.org
+++ b/doc/plan.org
@@ -111,10 +111,11 @@
 |            | - Create p4lang/p4-spec bug                                                |       |
 |            | https://github.com/p4lang/p4-spec/issues/745                               |       |
 |            |                                                                            |       |
-| 2019-03-21 | Meet Laurent #3                                                            |       |
+| 2019-03-21 | Meet Laurent #4                                                            |       |
 |            | - My dog ate my homework                                                   |       |
 |            | - Router solicitation for finding router on startup!                       |       |
 |            | - test.py for TDD                                                          |       |
+|            | - Parsing icmp6 is not enough - one layer deeper                           |       |
 |            |                                                                            |       |
 |            |                                                                            |       |
 | 2019-03-30 | NAT64 1:1 table ICMP, ICMPv6 working                                       |       |
@@ -754,7 +755,7 @@ DEBUG:main:INCOMING: <Ether  dst=00:00:0a:00:00:42 src=00:00:0a:00:00:01 type=0x
 DEBUG:main:cpu = <CpuHeader  task=ICMP6_GENERAL ingress_port=1 type=0x86dd |<Raw  load='`\x00\x00\x00\x00 :\xff\xfe\x80\x00\x00\x00\x00\x00\x00\x02\x00\n\xff\xfe\x00\x00\x01 \x01\r\xb8\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00B\x87\x00\x08+\x00\x00\x00\x00 \x01\r\xb8\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00B\x01\x01\x00\x00\n\x00\x00\x01' |>>
 DEBUG:main:reassambled=<Ether  dst=00:00:0a:00:00:42 src=00:00:0a:00:00:01 type=0x86dd |<IPv6  version=6 tc=0 fl=0 plen=32 nh=ICMPv6 hlim=255 src=fe80::200:aff:fe00:1 dst=2001:db8::42 |<ICMPv6ND_NS  type=Neighbor Solicitation code=0 cksum=0x82b res=0 tgt=2001:db8::42 |<ICMPv6NDOptSrcLLAddr  type=1 len=1 lladdr=00:00:0a:00:00:01 |>>>>
 
-***** TODO Debug why neighbor discover does not work anymore
+***** DONE Debug why neighbor discover does not work anymore
 ****** log
  p4@ubuntu:~$ mx h1 tcpdump -lni any
  sudo: unable to resolve host ubuntu
@@ -788,6 +789,9 @@ DEBUG:main:reassambled=<Ether  dst=00:00:0a:00:00:42 src=00:00:0a:00:00:01 type=
 
 ****** Do we have routing for fe80::/10? Probably not. Shouldn't we see it in the controller then?
 ****** NDP is controller only!
+***** TODO Finish NDP in switch
+****** TODO Need to set R/S/O bits
+****** TODO Need to parse R/S/O bits
 ***** TODO Maybe merge v6_address and v6_networks - /128 is the same
 ***** TODO Implement address learning?
 ***** TODO Not sure whether we should react on router solicitation
diff --git a/p4app/sniff-host b/p4app/sniff-host
new file mode 100644
index 0000000..827b0dc
--- /dev/null
+++ b/p4app/sniff-host
@@ -0,0 +1,11 @@
+#!/bin/sh
+
+set -x
+host=$1
+name=$2
+
+now=$(date +%F-%H%M)
+filename=${now}-${name}-${host}.pcap
+intf=${host}-eth0
+
+mx "$host" tcpdump -ni ${intf} -w "${filename}"