Staging
v0.5.1
v0.5.1
https://github.com/python/cpython
Tip revision: 74f4bd53e03ded8408bcc2de67cf0f5a4ac5b1a1 authored by Barry Warsaw on 23 February 2012, 15:59:38 UTC
Bump some more copyright years (as per PEP 101), since this is the first
Bump some more copyright years (as per PEP 101), since this is the first
Tip revision: 74f4bd5
rpc.py
# Sun RPC version 2 -- RFC1057.
# XXX There should be separate exceptions for the various reasons why
# XXX an RPC can fail, rather than using RuntimeError for everything
# XXX Need to use class based exceptions rather than string exceptions
# XXX The UDP version of the protocol resends requests when it does
# XXX not receive a timely reply -- use only for idempotent calls!
# XXX There is no provision for call timeout on TCP connections
import xdr
import socket
import os
RPCVERSION = 2
CALL = 0
REPLY = 1
AUTH_NULL = 0
AUTH_UNIX = 1
AUTH_SHORT = 2
AUTH_DES = 3
MSG_ACCEPTED = 0
MSG_DENIED = 1
SUCCESS = 0 # RPC executed successfully
PROG_UNAVAIL = 1 # remote hasn't exported program
PROG_MISMATCH = 2 # remote can't support version #
PROC_UNAVAIL = 3 # program can't support procedure
GARBAGE_ARGS = 4 # procedure can't decode params
RPC_MISMATCH = 0 # RPC version number != 2
AUTH_ERROR = 1 # remote can't authenticate caller
AUTH_BADCRED = 1 # bad credentials (seal broken)
AUTH_REJECTEDCRED = 2 # client must begin new session
AUTH_BADVERF = 3 # bad verifier (seal broken)
AUTH_REJECTEDVERF = 4 # verifier expired or replayed
AUTH_TOOWEAK = 5 # rejected for security reasons
class Packer(xdr.Packer):
def pack_auth(self, auth):
flavor, stuff = auth
self.pack_enum(flavor)
self.pack_opaque(stuff)
def pack_auth_unix(self, stamp, machinename, uid, gid, gids):
self.pack_uint(stamp)
self.pack_string(machinename)
self.pack_uint(uid)
self.pack_uint(gid)
self.pack_uint(len(gids))
for i in gids:
self.pack_uint(i)
def pack_callheader(self, xid, prog, vers, proc, cred, verf):
self.pack_uint(xid)
self.pack_enum(CALL)
self.pack_uint(RPCVERSION)
self.pack_uint(prog)
self.pack_uint(vers)
self.pack_uint(proc)
self.pack_auth(cred)
self.pack_auth(verf)
# Caller must add procedure-specific part of call
def pack_replyheader(self, xid, verf):
self.pack_uint(xid)
self.pack_enum(REPLY)
self.pack_uint(MSG_ACCEPTED)
self.pack_auth(verf)
self.pack_enum(SUCCESS)
# Caller must add procedure-specific part of reply
# Exceptions
class BadRPCFormat(Exception): pass
class BadRPCVersion(Exception): pass
class GarbageArgs(Exception): pass
class Unpacker(xdr.Unpacker):
def unpack_auth(self):
flavor = self.unpack_enum()
stuff = self.unpack_opaque()
return (flavor, stuff)
def unpack_callheader(self):
xid = self.unpack_uint()
temp = self.unpack_enum()
if temp != CALL:
raise BadRPCFormat, 'no CALL but %r' % (temp,)
temp = self.unpack_uint()
if temp != RPCVERSION:
raise BadRPCVersion, 'bad RPC version %r' % (temp,)
prog = self.unpack_uint()
vers = self.unpack_uint()
proc = self.unpack_uint()
cred = self.unpack_auth()
verf = self.unpack_auth()
return xid, prog, vers, proc, cred, verf
# Caller must add procedure-specific part of call
def unpack_replyheader(self):
xid = self.unpack_uint()
mtype = self.unpack_enum()
if mtype != REPLY:
raise RuntimeError, 'no REPLY but %r' % (mtype,)
stat = self.unpack_enum()
if stat == MSG_DENIED:
stat = self.unpack_enum()
if stat == RPC_MISMATCH:
low = self.unpack_uint()
high = self.unpack_uint()
raise RuntimeError, \
'MSG_DENIED: RPC_MISMATCH: %r' % ((low, high),)
if stat == AUTH_ERROR:
stat = self.unpack_uint()
raise RuntimeError, \
'MSG_DENIED: AUTH_ERROR: %r' % (stat,)
raise RuntimeError, 'MSG_DENIED: %r' % (stat,)
if stat != MSG_ACCEPTED:
raise RuntimeError, \
'Neither MSG_DENIED nor MSG_ACCEPTED: %r' % (stat,)
verf = self.unpack_auth()
stat = self.unpack_enum()
if stat == PROG_UNAVAIL:
raise RuntimeError, 'call failed: PROG_UNAVAIL'
if stat == PROG_MISMATCH:
low = self.unpack_uint()
high = self.unpack_uint()
raise RuntimeError, \
'call failed: PROG_MISMATCH: %r' % ((low, high),)
if stat == PROC_UNAVAIL:
raise RuntimeError, 'call failed: PROC_UNAVAIL'
if stat == GARBAGE_ARGS:
raise RuntimeError, 'call failed: GARBAGE_ARGS'
if stat != SUCCESS:
raise RuntimeError, 'call failed: %r' % (stat,)
return xid, verf
# Caller must get procedure-specific part of reply
# Subroutines to create opaque authentication objects
def make_auth_null():
return ''
def make_auth_unix(seed, host, uid, gid, groups):
p = Packer()
p.pack_auth_unix(seed, host, uid, gid, groups)
return p.get_buf()
def make_auth_unix_default():
try:
from os import getuid, getgid
uid = getuid()
gid = getgid()
except ImportError:
uid = gid = 0
import time
return make_auth_unix(int(time.time()-unix_epoch()), \
socket.gethostname(), uid, gid, [])
_unix_epoch = -1
def unix_epoch():
"""Very painful calculation of when the Unix Epoch is.
This is defined as the return value of time.time() on Jan 1st,
1970, 00:00:00 GMT.
On a Unix system, this should always return 0.0. On a Mac, the
calculations are needed -- and hard because of integer overflow
and other limitations.
"""
global _unix_epoch
if _unix_epoch >= 0: return _unix_epoch
import time
now = time.time()
localt = time.localtime(now) # (y, m, d, hh, mm, ss, ..., ..., ...)
gmt = time.gmtime(now)
offset = time.mktime(localt) - time.mktime(gmt)
y, m, d, hh, mm, ss = 1970, 1, 1, 0, 0, 0
offset, ss = divmod(ss + offset, 60)
offset, mm = divmod(mm + offset, 60)
offset, hh = divmod(hh + offset, 24)
d = d + offset
_unix_epoch = time.mktime((y, m, d, hh, mm, ss, 0, 0, 0))
print "Unix epoch:", time.ctime(_unix_epoch)
return _unix_epoch
# Common base class for clients
class Client:
def __init__(self, host, prog, vers, port):
self.host = host
self.prog = prog
self.vers = vers
self.port = port
self.makesocket() # Assigns to self.sock
self.bindsocket()
self.connsocket()
self.lastxid = 0 # XXX should be more random?
self.addpackers()
self.cred = None
self.verf = None
def close(self):
self.sock.close()
def makesocket(self):
# This MUST be overridden
raise RuntimeError, 'makesocket not defined'
def connsocket(self):
# Override this if you don't want/need a connection
self.sock.connect((self.host, self.port))
def bindsocket(self):
# Override this to bind to a different port (e.g. reserved)
self.sock.bind(('', 0))
def addpackers(self):
# Override this to use derived classes from Packer/Unpacker
self.packer = Packer()
self.unpacker = Unpacker('')
def make_call(self, proc, args, pack_func, unpack_func):
# Don't normally override this (but see Broadcast)
if pack_func is None and args is not None:
raise TypeError, 'non-null args with null pack_func'
self.start_call(proc)
if pack_func:
pack_func(args)
self.do_call()
if unpack_func:
result = unpack_func()
else:
result = None
self.unpacker.done()
return result
def start_call(self, proc):
# Don't override this
self.lastxid = xid = self.lastxid + 1
cred = self.mkcred()
verf = self.mkverf()
p = self.packer
p.reset()
p.pack_callheader(xid, self.prog, self.vers, proc, cred, verf)
def do_call(self):
# This MUST be overridden
raise RuntimeError, 'do_call not defined'
def mkcred(self):
# Override this to use more powerful credentials
if self.cred is None:
self.cred = (AUTH_NULL, make_auth_null())
return self.cred
def mkverf(self):
# Override this to use a more powerful verifier
if self.verf is None:
self.verf = (AUTH_NULL, make_auth_null())
return self.verf
def call_0(self): # Procedure 0 is always like this
return self.make_call(0, None, None, None)
# Record-Marking standard support
def sendfrag(sock, last, frag):
x = len(frag)
if last: x = x | 0x80000000L
header = (chr(int(x>>24 & 0xff)) + chr(int(x>>16 & 0xff)) + \
chr(int(x>>8 & 0xff)) + chr(int(x & 0xff)))
sock.send(header + frag)
def sendrecord(sock, record):
sendfrag(sock, 1, record)
def recvfrag(sock):
header = sock.recv(4)
if len(header) < 4:
raise EOFError
x = long(ord(header[0]))<<24 | ord(header[1])<<16 | \
ord(header[2])<<8 | ord(header[3])
last = ((x & 0x80000000) != 0)
n = int(x & 0x7fffffff)
frag = ''
while n > 0:
buf = sock.recv(n)
if not buf: raise EOFError
n = n - len(buf)
frag = frag + buf
return last, frag
def recvrecord(sock):
record = ''
last = 0
while not last:
last, frag = recvfrag(sock)
record = record + frag
return record
# Try to bind to a reserved port (must be root)
last_resv_port_tried = None
def bindresvport(sock, host):
global last_resv_port_tried
FIRST, LAST = 600, 1024 # Range of ports to try
if last_resv_port_tried is None:
import os
last_resv_port_tried = FIRST + os.getpid() % (LAST-FIRST)
for i in range(last_resv_port_tried, LAST) + \
range(FIRST, last_resv_port_tried):
last_resv_port_tried = i
try:
sock.bind((host, i))
return last_resv_port_tried
except socket.error, (errno, msg):
if errno != 114:
raise socket.error, (errno, msg)
raise RuntimeError, 'can\'t assign reserved port'
# Client using TCP to a specific port
class RawTCPClient(Client):
def makesocket(self):
self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
def do_call(self):
call = self.packer.get_buf()
sendrecord(self.sock, call)
reply = recvrecord(self.sock)
u = self.unpacker
u.reset(reply)
xid, verf = u.unpack_replyheader()
if xid != self.lastxid:
# Can't really happen since this is TCP...
raise RuntimeError, 'wrong xid in reply %r instead of %r' % (
xid, self.lastxid)
# Client using UDP to a specific port
class RawUDPClient(Client):
def makesocket(self):
self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
def do_call(self):
call = self.packer.get_buf()
self.sock.send(call)
try:
from select import select
except ImportError:
print 'WARNING: select not found, RPC may hang'
select = None
BUFSIZE = 8192 # Max UDP buffer size
timeout = 1
count = 5
while 1:
r, w, x = [self.sock], [], []
if select:
r, w, x = select(r, w, x, timeout)
if self.sock not in r:
count = count - 1
if count < 0: raise RuntimeError, 'timeout'
if timeout < 25: timeout = timeout *2
## print 'RESEND', timeout, count
self.sock.send(call)
continue
reply = self.sock.recv(BUFSIZE)
u = self.unpacker
u.reset(reply)
xid, verf = u.unpack_replyheader()
if xid != self.lastxid:
## print 'BAD xid'
continue
break
# Client using UDP broadcast to a specific port
class RawBroadcastUDPClient(RawUDPClient):
def __init__(self, bcastaddr, prog, vers, port):
RawUDPClient.__init__(self, bcastaddr, prog, vers, port)
self.reply_handler = None
self.timeout = 30
def connsocket(self):
# Don't connect -- use sendto
self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
def set_reply_handler(self, reply_handler):
self.reply_handler = reply_handler
def set_timeout(self, timeout):
self.timeout = timeout # Use None for infinite timeout
def make_call(self, proc, args, pack_func, unpack_func):
if pack_func is None and args is not None:
raise TypeError, 'non-null args with null pack_func'
self.start_call(proc)
if pack_func:
pack_func(args)
call = self.packer.get_buf()
self.sock.sendto(call, (self.host, self.port))
try:
from select import select
except ImportError:
print 'WARNING: select not found, broadcast will hang'
select = None
BUFSIZE = 8192 # Max UDP buffer size (for reply)
replies = []
if unpack_func is None:
def dummy(): pass
unpack_func = dummy
while 1:
r, w, x = [self.sock], [], []
if select:
if self.timeout is None:
r, w, x = select(r, w, x)
else:
r, w, x = select(r, w, x, self.timeout)
if self.sock not in r:
break
reply, fromaddr = self.sock.recvfrom(BUFSIZE)
u = self.unpacker
u.reset(reply)
xid, verf = u.unpack_replyheader()
if xid != self.lastxid:
## print 'BAD xid'
continue
reply = unpack_func()
self.unpacker.done()
replies.append((reply, fromaddr))
if self.reply_handler:
self.reply_handler(reply, fromaddr)
return replies
# Port mapper interface
# Program number, version and (fixed!) port number
PMAP_PROG = 100000
PMAP_VERS = 2
PMAP_PORT = 111
# Procedure numbers
PMAPPROC_NULL = 0 # (void) -> void
PMAPPROC_SET = 1 # (mapping) -> bool
PMAPPROC_UNSET = 2 # (mapping) -> bool
PMAPPROC_GETPORT = 3 # (mapping) -> unsigned int
PMAPPROC_DUMP = 4 # (void) -> pmaplist
PMAPPROC_CALLIT = 5 # (call_args) -> call_result
# A mapping is (prog, vers, prot, port) and prot is one of:
IPPROTO_TCP = 6
IPPROTO_UDP = 17
# A pmaplist is a variable-length list of mappings, as follows:
# either (1, mapping, pmaplist) or (0).
# A call_args is (prog, vers, proc, args) where args is opaque;
# a call_result is (port, res) where res is opaque.
class PortMapperPacker(Packer):
def pack_mapping(self, mapping):
prog, vers, prot, port = mapping
self.pack_uint(prog)
self.pack_uint(vers)
self.pack_uint(prot)
self.pack_uint(port)
def pack_pmaplist(self, list):
self.pack_list(list, self.pack_mapping)
def pack_call_args(self, ca):
prog, vers, proc, args = ca
self.pack_uint(prog)
self.pack_uint(vers)
self.pack_uint(proc)
self.pack_opaque(args)
class PortMapperUnpacker(Unpacker):
def unpack_mapping(self):
prog = self.unpack_uint()
vers = self.unpack_uint()
prot = self.unpack_uint()
port = self.unpack_uint()
return prog, vers, prot, port
def unpack_pmaplist(self):
return self.unpack_list(self.unpack_mapping)
def unpack_call_result(self):
port = self.unpack_uint()
res = self.unpack_opaque()
return port, res
class PartialPortMapperClient:
def addpackers(self):
self.packer = PortMapperPacker()
self.unpacker = PortMapperUnpacker('')
def Set(self, mapping):
return self.make_call(PMAPPROC_SET, mapping, \
self.packer.pack_mapping, \
self.unpacker.unpack_uint)
def Unset(self, mapping):
return self.make_call(PMAPPROC_UNSET, mapping, \
self.packer.pack_mapping, \
self.unpacker.unpack_uint)
def Getport(self, mapping):
return self.make_call(PMAPPROC_GETPORT, mapping, \
self.packer.pack_mapping, \
self.unpacker.unpack_uint)
def Dump(self):
return self.make_call(PMAPPROC_DUMP, None, \
None, \
self.unpacker.unpack_pmaplist)
def Callit(self, ca):
return self.make_call(PMAPPROC_CALLIT, ca, \
self.packer.pack_call_args, \
self.unpacker.unpack_call_result)
class TCPPortMapperClient(PartialPortMapperClient, RawTCPClient):
def __init__(self, host):
RawTCPClient.__init__(self, \
host, PMAP_PROG, PMAP_VERS, PMAP_PORT)
class UDPPortMapperClient(PartialPortMapperClient, RawUDPClient):
def __init__(self, host):
RawUDPClient.__init__(self, \
host, PMAP_PROG, PMAP_VERS, PMAP_PORT)
class BroadcastUDPPortMapperClient(PartialPortMapperClient, \
RawBroadcastUDPClient):
def __init__(self, bcastaddr):
RawBroadcastUDPClient.__init__(self, \
bcastaddr, PMAP_PROG, PMAP_VERS, PMAP_PORT)
# Generic clients that find their server through the Port mapper
class TCPClient(RawTCPClient):
def __init__(self, host, prog, vers):
pmap = TCPPortMapperClient(host)
port = pmap.Getport((prog, vers, IPPROTO_TCP, 0))
pmap.close()
if port == 0:
raise RuntimeError, 'program not registered'
RawTCPClient.__init__(self, host, prog, vers, port)
class UDPClient(RawUDPClient):
def __init__(self, host, prog, vers):
pmap = UDPPortMapperClient(host)
port = pmap.Getport((prog, vers, IPPROTO_UDP, 0))
pmap.close()
if port == 0:
raise RuntimeError, 'program not registered'
RawUDPClient.__init__(self, host, prog, vers, port)
class BroadcastUDPClient(Client):
def __init__(self, bcastaddr, prog, vers):
self.pmap = BroadcastUDPPortMapperClient(bcastaddr)
self.pmap.set_reply_handler(self.my_reply_handler)
self.prog = prog
self.vers = vers
self.user_reply_handler = None
self.addpackers()
def close(self):
self.pmap.close()
def set_reply_handler(self, reply_handler):
self.user_reply_handler = reply_handler
def set_timeout(self, timeout):
self.pmap.set_timeout(timeout)
def my_reply_handler(self, reply, fromaddr):
port, res = reply
self.unpacker.reset(res)
result = self.unpack_func()
self.unpacker.done()
self.replies.append((result, fromaddr))
if self.user_reply_handler is not None:
self.user_reply_handler(result, fromaddr)
def make_call(self, proc, args, pack_func, unpack_func):
self.packer.reset()
if pack_func:
pack_func(args)
if unpack_func is None:
def dummy(): pass
self.unpack_func = dummy
else:
self.unpack_func = unpack_func
self.replies = []
packed_args = self.packer.get_buf()
dummy_replies = self.pmap.Callit( \
(self.prog, self.vers, proc, packed_args))
return self.replies
# Server classes
# These are not symmetric to the Client classes
# XXX No attempt is made to provide authorization hooks yet
class Server:
def __init__(self, host, prog, vers, port):
self.host = host # Should normally be '' for default interface
self.prog = prog
self.vers = vers
self.port = port # Should normally be 0 for random port
self.makesocket() # Assigns to self.sock and self.prot
self.bindsocket()
self.host, self.port = self.sock.getsockname()
self.addpackers()
def register(self):
mapping = self.prog, self.vers, self.prot, self.port
p = TCPPortMapperClient(self.host)
if not p.Set(mapping):
raise RuntimeError, 'register failed'
def unregister(self):
mapping = self.prog, self.vers, self.prot, self.port
p = TCPPortMapperClient(self.host)
if not p.Unset(mapping):
raise RuntimeError, 'unregister failed'
def handle(self, call):
# Don't use unpack_header but parse the header piecewise
# XXX I have no idea if I am using the right error responses!
self.unpacker.reset(call)
self.packer.reset()
xid = self.unpacker.unpack_uint()
self.packer.pack_uint(xid)
temp = self.unpacker.unpack_enum()
if temp != CALL:
return None # Not worthy of a reply
self.packer.pack_uint(REPLY)
temp = self.unpacker.unpack_uint()
if temp != RPCVERSION:
self.packer.pack_uint(MSG_DENIED)
self.packer.pack_uint(RPC_MISMATCH)
self.packer.pack_uint(RPCVERSION)
self.packer.pack_uint(RPCVERSION)
return self.packer.get_buf()
self.packer.pack_uint(MSG_ACCEPTED)
self.packer.pack_auth((AUTH_NULL, make_auth_null()))
prog = self.unpacker.unpack_uint()
if prog != self.prog:
self.packer.pack_uint(PROG_UNAVAIL)
return self.packer.get_buf()
vers = self.unpacker.unpack_uint()
if vers != self.vers:
self.packer.pack_uint(PROG_MISMATCH)
self.packer.pack_uint(self.vers)
self.packer.pack_uint(self.vers)
return self.packer.get_buf()
proc = self.unpacker.unpack_uint()
methname = 'handle_' + repr(proc)
try:
meth = getattr(self, methname)
except AttributeError:
self.packer.pack_uint(PROC_UNAVAIL)
return self.packer.get_buf()
cred = self.unpacker.unpack_auth()
verf = self.unpacker.unpack_auth()
try:
meth() # Unpack args, call turn_around(), pack reply
except (EOFError, GarbageArgs):
# Too few or too many arguments
self.packer.reset()
self.packer.pack_uint(xid)
self.packer.pack_uint(REPLY)
self.packer.pack_uint(MSG_ACCEPTED)
self.packer.pack_auth((AUTH_NULL, make_auth_null()))
self.packer.pack_uint(GARBAGE_ARGS)
return self.packer.get_buf()
def turn_around(self):
try:
self.unpacker.done()
except RuntimeError:
raise GarbageArgs
self.packer.pack_uint(SUCCESS)
def handle_0(self): # Handle NULL message
self.turn_around()
def makesocket(self):
# This MUST be overridden
raise RuntimeError, 'makesocket not defined'
def bindsocket(self):
# Override this to bind to a different port (e.g. reserved)
self.sock.bind((self.host, self.port))
def addpackers(self):
# Override this to use derived classes from Packer/Unpacker
self.packer = Packer()
self.unpacker = Unpacker('')
class TCPServer(Server):
def makesocket(self):
self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.prot = IPPROTO_TCP
def loop(self):
self.sock.listen(0)
while 1:
self.session(self.sock.accept())
def session(self, connection):
sock, (host, port) = connection
while 1:
try:
call = recvrecord(sock)
except EOFError:
break
except socket.error, msg:
print 'socket error:', msg
break
reply = self.handle(call)
if reply is not None:
sendrecord(sock, reply)
def forkingloop(self):
# Like loop but uses forksession()
self.sock.listen(0)
while 1:
self.forksession(self.sock.accept())
def forksession(self, connection):
# Like session but forks off a subprocess
import os
# Wait for deceased children
try:
while 1:
pid, sts = os.waitpid(0, 1)
except os.error:
pass
pid = None
try:
pid = os.fork()
if pid: # Parent
connection[0].close()
return
# Child
self.session(connection)
finally:
# Make sure we don't fall through in the parent
if pid == 0:
os._exit(0)
class UDPServer(Server):
def makesocket(self):
self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.prot = IPPROTO_UDP
def loop(self):
while 1:
self.session()
def session(self):
call, host_port = self.sock.recvfrom(8192)
reply = self.handle(call)
if reply is not None:
self.sock.sendto(reply, host_port)
# Simple test program -- dump local portmapper status
def test():
pmap = UDPPortMapperClient('')
list = pmap.Dump()
list.sort()
for prog, vers, prot, port in list:
print prog, vers,
if prot == IPPROTO_TCP: print 'tcp',
elif prot == IPPROTO_UDP: print 'udp',
else: print prot,
print port
# Test program for broadcast operation -- dump everybody's portmapper status
def testbcast():
import sys
if sys.argv[1:]:
bcastaddr = sys.argv[1]
else:
bcastaddr = '<broadcast>'
def rh(reply, fromaddr):
host, port = fromaddr
print host + '\t' + repr(reply)
pmap = BroadcastUDPPortMapperClient(bcastaddr)
pmap.set_reply_handler(rh)
pmap.set_timeout(5)
replies = pmap.Getport((100002, 1, IPPROTO_UDP, 0))
# Test program for server, with corresponding client
# On machine A: python -c 'import rpc; rpc.testsvr()'
# On machine B: python -c 'import rpc; rpc.testclt()' A
# (A may be == B)
def testsvr():
# Simple test class -- proc 1 doubles its string argument as reply
class S(UDPServer):
def handle_1(self):
arg = self.unpacker.unpack_string()
self.turn_around()
print 'RPC function 1 called, arg', repr(arg)
self.packer.pack_string(arg + arg)
#
s = S('', 0x20000000, 1, 0)
try:
s.unregister()
except RuntimeError, msg:
print 'RuntimeError:', msg, '(ignored)'
s.register()
print 'Service started...'
try:
s.loop()
finally:
s.unregister()
print 'Service interrupted.'
def testclt():
import sys
if sys.argv[1:]: host = sys.argv[1]
else: host = ''
# Client for above server
class C(UDPClient):
def call_1(self, arg):
return self.make_call(1, arg, \
self.packer.pack_string, \
self.unpacker.unpack_string)
c = C(host, 0x20000000, 1)
print 'making call...'
reply = c.call_1('hello, world, ')
print 'call returned', repr(reply)