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Update mcast.py #2

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59 changes: 26 additions & 33 deletions mcast.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,62 +14,47 @@
# mcast -s -i eth0 (sender, IPv4, eth0)
# mcast -i eth0 (receivers, IPv4, eth0)

MYPORT = 8123
MYGROUP_4 = '225.0.0.250'
MYGROUP_6 = 'ff15:7079:7468:6f6e:6465:6d6f:6d63:6173'
MYTTL = 1 # Increase to reach other networks

import time
import struct
import socket
import sys, getopt
import sys
import fcntl
from optparse import OptionParser

def main(argv):
group = MYGROUP_4
port = MYPORT
action = 0
interface = None

try:
opts, args = getopt.getopt(argv,"s6i:",["inf="])
except getopt.GetoptError:
print 'wrong input'
sys.exit(2)
for opt, arg in opts:
if opt == '-s':
action = 1
elif opt == '-6':
group = MYGROUP_6
elif opt in ("-i", "--inf"):
interface = arg
def main(opts):
if not opts.interface:
p.error("to specify interface is minimum ")

if action == 0:
if opts.interface:
interface = opts.interface
if opts.ipv6:
group = 'ff15:7079:7468:6f6e:6465:6d6f:6d63:6173'
else:
group = '225.0.0.250'
if not opts.sender:
# multicast receiver
receiver(group, interface)
else:
# multicast sender
sender(group, interface)


def sender(group, interface):
addrinfo = socket.getaddrinfo(group, None)[0]

s = socket.socket(addrinfo[0], socket.SOCK_DGRAM)

# Set Time-to-live (optional)
ttl_bin = struct.pack('@i', MYTTL)
ttl_bin = struct.pack('@i', opts.ttl)
if addrinfo[0] == socket.AF_INET: # IPv4
s.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, ttl_bin)
else:
s.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_HOPS, ttl_bin)

if interface != None:
s.setsockopt(socket.SOL_SOCKET, 25, interface)
s.bind(('', opts.port))

while True:
data = repr(time.time())
s.sendto(data + '\0', (addrinfo[4][0], MYPORT))
s.sendto(data + '\0', (addrinfo[4][0], opts.port))
time.sleep(1)

def receiver(group, interface):
Expand All @@ -84,7 +69,7 @@ def receiver(group, interface):
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

# Bind it to the port
s.bind(('', MYPORT))
s.bind(('', opts.port))

group_bin = socket.inet_pton(addrinfo[0], addrinfo[4][0])
# Join group
Expand All @@ -93,7 +78,7 @@ def receiver(group, interface):
if interface == None:
mreq = group_bin + struct.pack('=I', socket.INADDR_ANY)
else:
ip_addr = get_ip_address(interface)
ip_addr = socket.gethostbyname(socket.gethostname())
ip_addr_n = socket.inet_aton(ip_addr)
mreq = group_bin + struct.pack("=4s", ip_addr_n)
s.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
Expand Down Expand Up @@ -122,4 +107,12 @@ def get_ip_address(ifname):
)[20:24])

if __name__ == '__main__':
main(sys.argv[1:])
p = OptionParser(usage="usage: %prog [ --interface <INTERFACE> ] --port <PORT_NUMBER> --send ",
version="%prog 0.7")
p.add_option("-s", "--send", dest="sender", help="Send Mcast", action="store_true")
p.add_option("-6", "--ipv6", dest="ipv6", help="Ipv6 Mcast", action="store_true")
p.add_option("-i", "--interface", dest="interface", help="Network interface")
p.add_option("-p", "--port", dest="port", help="Network Port", default="8123", type="int")
p.add_option("-t", "--ttl", dest="ttl", help="Mcast ttl", default="1", type="int")
(opts, args) = p.parse_args()
main(opts)