3 This module exposes an XMLRPC interface that allows PlanetLab users to
4 create/destroy slivers with delegated instantiation, start and stop
5 slivers, make resource loans, and examine resource allocations. The
6 XMLRPC is provided on a localhost-only TCP port as well as via a Unix
7 domain socket that is accessible by ssh-ing into a delegate account
8 with the forward_api_calls shell.
11 import SimpleXMLRPCServer
27 from api_calls import *
30 UNIX_ADDR = '/tmp/sliver_mgr.api'
32 class APIRequestHandler(SimpleXMLRPCServer.SimpleXMLRPCRequestHandler):
33 # overriding _dispatch to achieve this effect is officially deprecated,
34 # but I can't figure out how to get access to .request without
35 # duplicating SimpleXMLRPCServer code here, which is more likely to
36 # change than the deprecated behavior is to be broken
38 @database.synchronized
39 def _dispatch(self, method_name_unicode, args):
40 method_name = str(method_name_unicode)
41 try: method = api_method_dict[method_name]
43 api_method_list = api_method_dict.keys()
44 api_method_list.sort()
45 raise xmlrpclib.Fault(100, 'Invalid API method %s. Valid choices are %s' % \
46 (method_name, ', '.join(api_method_list)))
47 expected_nargs = nargs_dict[method_name]
48 if len(args) != expected_nargs:
49 raise xmlrpclib.Fault(101, 'Invalid argument count: got %d, expecting %d.' % \
50 (len(args), expected_nargs))
52 # Figure out who's calling.
53 # XXX - these ought to be imported directly from some .h file
55 sizeof_struct_ucred = 12
56 ucred = self.request.getsockopt(socket.SOL_SOCKET, SO_PEERCRED, sizeof_struct_ucred)
57 xid = struct.unpack('3i', ucred)[2]
58 caller_name = pwd.getpwuid(xid)[0]
59 if method_name not in ('ReCreate', 'Help', 'Ticket', 'GetXIDs', 'GetSSHKeys'):
61 target_rec = database.db.get(target_name)
62 if not (target_rec and target_rec['type'].startswith('sliver.')):
63 raise xmlrpclib.Fault(102, \
64 'Invalid argument: the first argument must be a sliver name.')
65 if not caller_name in (target_name, target_rec['delegations']):
66 raise xmlrpclib.Fault(108, 'Permission denied.')
67 try: result = method(target_rec, *args[1:])
68 except Exception, err: raise xmlrpclib.Fault(104, 'Error in call: %s' %err)
69 else: result = method(*args)
70 if result == None: result = 1
73 class APIServer_INET(SocketServer.ThreadingMixIn, SimpleXMLRPCServer.SimpleXMLRPCServer): allow_reuse_address = True
75 class APIServer_UNIX(APIServer_INET): address_family = socket.AF_UNIX
78 """Start two XMLRPC interfaces: one bound to localhost, the other bound to a Unix domain socket."""
79 serv1 = APIServer_INET(('127.0.0.1', API_SERVER_PORT), requestHandler=APIRequestHandler, logRequests=0)
80 tools.as_daemon_thread(serv1.serve_forever)
81 try: os.unlink(UNIX_ADDR)
83 if e.errno != errno.ENOENT: raise
84 serv2 = APIServer_UNIX(UNIX_ADDR, requestHandler=APIRequestHandler, logRequests=0)
85 tools.as_daemon_thread(serv2.serve_forever)
86 os.chmod(UNIX_ADDR, 0666)