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📄 README(814 B)
📄 broadcast.py(283 B)
📄 broadcast.pyc(546 B)
📄 broadcast.pyo(546 B)
📄 echosvr.py(742 B)
📄 echosvr.pyc(830 B)
📄 echosvr.pyo(830 B)
📄 finger.py(1.23 KB)
📄 finger.pyc(1.15 KB)
📄 finger.pyo(1.15 KB)
📄 ftp.py(3.84 KB)
📄 ftp.pyc(2.9 KB)
📄 ftp.pyo(2.9 KB)
📄 gopher.py(9.56 KB)
📄 gopher.pyc(10.18 KB)
📄 gopher.pyo(10.18 KB)
📄 mcast.py(2.33 KB)
📄 mcast.pyc(2.04 KB)
📄 mcast.pyo(2.04 KB)
📄 radio.py(287 B)
📄 radio.pyc(470 B)
📄 radio.pyo(470 B)
📄 rpython.py(717 B)
📄 rpython.pyc(987 B)
📄 rpython.pyo(987 B)
📄 rpythond.py(1.19 KB)
📄 rpythond.pyc(1.31 KB)
📄 rpythond.pyo(1.31 KB)
📄 telnet.py(2.94 KB)
📄 telnet.pyc(2.13 KB)
📄 telnet.pyo(2.13 KB)
📄 throughput.py(2.04 KB)
📄 throughput.pyc(2.43 KB)
📄 throughput.pyo(2.43 KB)
📄 udpecho.py(1.44 KB)
📄 udpecho.pyc(1.99 KB)
📄 udpecho.pyo(1.99 KB)
📄 unicast.py(230 B)
📄 unicast.pyc(455 B)
📄 unicast.pyo(455 B)
📄 unixclient.py(232 B)
📄 unixclient.pyc(424 B)
📄 unixclient.pyo(424 B)
📄 unixserver.py(414 B)
📄 unixserver.pyc(599 B)
📄 unixserver.pyo(599 B)

Editing: mcast.py

# Send/receive UDP multicast packets.
# Requires that your OS kernel supports IP multicast.
# This is built-in on SGI, still optional for most other vendors.
#
# Usage:
#   mcast -s (sender)
#   mcast -b (sender, using broadcast instead multicast)
#   mcast    (receivers)

MYPORT = 8123
MYGROUP = '225.0.0.250'

import sys
import time
import struct
from socket import *

# Main program
def main():
    flags = sys.argv[1:]
    #
    if flags:
        sender(flags[0])
    else:
        receiver()

# Sender subroutine (only one per local area network)
def sender(flag):
    s = socket(AF_INET, SOCK_DGRAM)
    if flag == '-b':
        s.setsockopt(SOL_SOCKET, SO_BROADCAST, 1)
        mygroup = '<broadcast>'
    else:
        mygroup = MYGROUP
        ttl = struct.pack('b', 1)               # Time-to-live
        s.setsockopt(IPPROTO_IP, IP_MULTICAST_TTL, ttl)
    while 1:
        data = repr(time.time())
##              data = data + (1400 - len(data)) * '\0'
        s.sendto(data, (mygroup, MYPORT))
        time.sleep(1)

# Receiver subroutine (as many as you like)
def receiver():
    # Open and initialize the socket
    s = openmcastsock(MYGROUP, MYPORT)
    #
    # Loop, printing any data we receive
    while 1:
        data, sender = s.recvfrom(1500)
        while data[-1:] == '\0': data = data[:-1] # Strip trailing \0's
        print sender, ':', repr(data)

# Open a UDP socket, bind it to a port and select a multicast group
def openmcastsock(group, port):
    # Import modules used only here
    import string
    import struct
    #
    # Create a socket
    s = socket(AF_INET, SOCK_DGRAM)
    #
    # Allow multiple copies of this program on one machine
    # (not strictly needed)
    s.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)
    #
    # Bind it to the port
    s.bind(('', port))
    #
    # Look up multicast group address in name server
    # (doesn't hurt if it is already in ddd.ddd.ddd.ddd format)
    group = gethostbyname(group)
    #
    # Construct binary group address
    bytes = map(int, string.split(group, "."))
    grpaddr = 0
    for byte in bytes: grpaddr = (grpaddr << 8) | byte
    #
    # Construct struct mreq from grpaddr and ifaddr
    ifaddr = INADDR_ANY
    mreq = struct.pack('ll', htonl(grpaddr), htonl(ifaddr))
    #
    # Add group membership
    s.setsockopt(IPPROTO_IP, IP_ADD_MEMBERSHIP, mreq)
    #
    return s

main()

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Editing: mcast.py

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