Update Packet __iter__() method

[NazarTkachuk]

Iteration over every layer starting with lowest layer doesn't work. All time first layer is skipped because _get_bodyhandler() method returns next layer for lowest layer as well.

pkt = ethernet.Ethernet()+ip.IP()+tcp.TCP()
for p in pkt.lowest_layer:
... print(p)
...
IP(v_hl=45, tos=0, len=28, id=0, off=0, ttl=40, p=6, sum=7AD1, src=b'\x00\x00\x00\x00', dst=b'\x00\x00\x00\x00', opts=[], handler=tcp)
TCP(sport=DEAD, dport=0, seq=DEADBEEF, ack=0, off_x2=50, flags=2, win=FFFF, sum=3398, urp=0, opts=[], bytes=b'')

I created pull request with proposal to start iterate from first layer all time. It makes iteration more flexible.
To skip first layer use upper layer or body handler. See examples below

1. Iterate over every layer

pkt = ethernet.Ethernet()+ip.IP()+tcp.TCP()
for p in pkt:
... print(p)
...
Ethernet(dst=b'\xff\xff\xff\xff\xff\xff', src=b'\xff\xff\xff\xff\xff\xff', vlan=[], type=800, handler=ip)
IP(v_hl=45, tos=0, len=28, id=0, off=0, ttl=40, p=6, sum=7AD1, src=b'\x00\x00\x00\x00', dst=b'\x00\x00\x00\x00', opts=[], handler=tcp)
TCP(sport=DEAD, dport=0, seq=DEADBEEF, ack=0, off_x2=50, flags=2, win=FFFF, sum=3398, urp=0, opts=[], bytes=b'')

2. Skip first layer

for p in pkt.upper_layer:
... print(p)
...
IP(v_hl=45, tos=0, len=28, id=0, off=0, ttl=40, p=6, sum=7AD1, src=b'\x00\x00\x00\x00', dst=b'\x00\x00\x00\x00', opts=[], handler=tcp)
TCP(sport=DEAD, dport=0, seq=DEADBEEF, ack=0, off_x2=50, flags=2, win=FFFF, sum=3398, urp=0, opts=[], bytes=b'')

3. Start from highest

for p in pkt.highest_layer:
... print(p)
...
TCP(sport=DEAD, dport=0, seq=DEADBEEF, ack=0, off_x2=50, flags=2, win=FFFF, sum=3398, urp=0, opts=[], bytes=b'')

Thanks,
Nazar

[mike01]

Thanks, pull request got merged