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andrewn/README.md

Created January 26, 2018 11:35
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Do something when Pi's being being ping'd
Raw
receive_ping.py
#!/usr/bin/python
import socket
# Open a raw socket listening on all ip addresses
sock = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_ICMP)
sock.bind(('', 1))
try :
while True :
# receive data
data = sock.recv(1024)
# ip header is the first 20 bytes
ip_header = data[:20]
# ip source address is 4 bytes and is second last field (dest addr is last)
ips = ip_header[-8:-4]
# convert to dotted decimal format
source = '%i.%i.%i.%i' % (ord(ips[0]), ord(ips[1]), ord(ips[2]), ord(ips[3]))
# Flash LED
# Play a sound
print 'Ping from %s' % source
except KeyboardInterrupt :
print ''
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