source: fedd/fedd_client.py @ c922f23

#!/usr/local/bin/python

import sys
import os
import pwd

from fedd_services import *
from fedd_internal_services import *

from M2Crypto import SSL, X509
from M2Crypto.m2xmlrpclib import SSL_Transport
import M2Crypto.httpslib

from xmlrpclib import ServerProxy, Error, dumps, loads
from ZSI import SoapWriter
from ZSI.TC import QName, String, URI, AnyElement, UNBOUNDED, Any
from ZSI.wstools.Namespaces import SOAP
from ZSI.fault import FaultType, Detail

import xmlrpclib

from fedd_util import fedid, fedd_ssl_context, pack_soap, unpack_soap, \
        pack_id, unpack_id, encapsulate_binaries, decapsulate_binaries

from optparse import OptionParser, OptionValueError

import parse_detail

# Turn off the matching of hostname to certificate ID
SSL.Connection.clientPostConnectionCheck = None

class IDFormatException(RuntimeError): pass

class access_method:
    """Encapsulates an access method generically."""
    (type_ssh, type_x509, type_pgp) = ('sshPubkey', 'X509', 'pgpPubkey')
    default_type = type_ssh
    def __init__(self, buf=None, type=None, file=None):
        self.buf = buf

        if type != None: self.type = type
        else: self.type = access_method.default_type

        if file != None:
            self.readfile(file)
    
    def readfile(self, file, type=None):
        f = open(file, "r")
        self.buf = f.read();
        f.close()
        if type == None:
            if self.type == None:
                self.type = access_method.default_type
        else:
            self.type = type;
    
class node_desc:
    def __init__(self, image, hardware, count=1):
        if getattr(image, "__iter__", None) == None:
            if image == None: self.image = [ ]
            else: self.image = [ image ]
        else:
            self.image = image

        if getattr(hardware, "__iter__", None) == None: 
            if hardware == None: self.hardware = [ ]
            else: self.hardware = [ hardware ]
        else:
            self.hardware = hardware
        if count != None: self.count = int(count)
        else: self.count = 1

class fedd_client_opts(OptionParser):
    """Encapsulate option processing in this class, rather than in main"""
    def __init__(self):
        OptionParser.__init__(self, usage="%prog [opts] (--help for details)",
                version="0.1")

        self.add_option("-c","--cert", action="store", dest="cert",
                type="string", help="my certificate file")
        self.add_option("-d", "--debug", action="count", dest="debug", 
                default=0, help="Set debug.  Repeat for more information")
        self.add_option("-s", "--serializeOnly", action="store_true", 
                dest="serialize_only", default=False,
                help="Print the SOAP request that would be sent and exit")
        self.add_option("-T","--trusted", action="store", dest="trusted",
                type="string", help="Trusted certificates (required)")
        self.add_option("-u", "--url", action="store", dest="url",
                type="string",default="https://localhost:23235",  
                help="URL to connect to (default %default)")
        self.add_option("-x","--transport", action="store", type="choice",
                choices=("xmlrpc", "soap"), default="soap",
                help="Transport for request (xmlrpc|soap) (Default: %default)")
        self.add_option("--trace", action="store_const", dest="tracefile", 
                const=sys.stderr, help="Print SOAP exchange to stderr")

class fedd_create_opts(fedd_client_opts):
    def __init__(self, access_keys, add_key_callback=None, 
            add_cert_callback=None):
        fedd_client_opts.__init__(self)
        self.add_option("-e", "--experiment_cert", dest="out_certfile",
                type="string", help="output certificate file")
        self.add_option("-E", "--experiment_name", dest="exp_name",
                type="string", help="output certificate file")
        self.add_option("-F","--useFedid", action="store_true",
                dest="use_fedid", default=False,
                help="Use a fedid derived from my certificate as user identity")
        self.add_option("-f", "--file", dest="file", 
                help="experiment description file")
        if add_key_callback:
            self.add_option("-k", "--sshKey", action="callback", type="string", 
                    callback=add_key_callback, callback_args=(access_keys,),
                    help="ssh key for access (can be supplied more than once")
        if add_cert_callback:
            self.add_option("-K", "--x509Key", action="callback",
                    type="string", callback=add_cert_callback,
                    callback_args=(access_keys,),
                    help="X509 certificate for access " + \
                        "(can be supplied more than once")
        self.add_option("-m", "--master", dest="master",
                help="Master testbed in the federation")
        self.add_option("-U", "--username", action="store", dest="user",
                type="string", help="Use this username instead of the uid")

class fedd_split_opts(fedd_create_opts):
    def __init__(self, access_keys, add_key_callback=None, 
            add_cert_callback=None):
        fedd_create_opts.__init__(self, access_keys, add_key_callback,
                add_cert_callback)
        self.add_option('-t','--fedkit', action='store_true', dest='fedkit',
                default=False,
                help="get output suitable for federation kit install")


class fedd_access_opts(fedd_create_opts):
    def __init__(self, access_keys, node_descs, add_key_callback=None, 
            add_cert_callback=None, add_node_callback=None):
        fedd_create_opts.__init__(self, access_keys, add_key_callback,
                add_cert_callback)
        self.add_option("-a","--anonymous", action="store_true",
                dest="anonymous", default=False,
                help="Do not include a user in the request")
        self.add_option("-l","--label", action="store", dest="label",
                type="string", help="Label for output")
        if add_node_callback:
            self.add_option("-n", "--node", action="callback", type="string", 
                    callback=add_node_callback, callback_args=(node_descs,),
                    help="Node description: image:hardware[:count]")
        self.add_option("-p", "--project", action="store", dest="project", 
                type="string",
                help="Use a project request with this project name")
        self.add_option("-t", "--testbed", action="store", dest="testbed",
                type="string",
                help="Testbed identifier (URI) to contact (required)")

class fedd_exp_data_opts(fedd_client_opts):
    def __init__(self):
        fedd_client_opts.__init__(self)
        self.add_option("-e", "--experiment_cert", dest="exp_certfile",
                type="string", help="output certificate file")
        self.add_option("-E", "--experiment_name", dest="exp_name",
                type="string", help="output certificate file")

def exit_with_fault(dict, out=sys.stderr):
    """ Print an error message and exit.

    The dictionary contains the FeddFaultBody elements."""
    codestr = ""

    if dict.has_key('errstr'):
        codestr = "Error: %s" % dict['errstr']

    if dict.has_key('code'):
        if len(codestr) > 0 : 
            codestr += " (%d)" % dict['code']
        else:
            codestr = "Error Code: %d" % dict['code']

    print>>out, codestr
    print>>out, "Description: %s" % dict['desc']
    sys.exit(dict.get('code', 20))
# Base class that will do a the SOAP/XMLRPC exchange for a request.
class fedd_rpc:
    class RPCException:
        def __init__(self, fb):
            self.desc = fb.get('desc', None)
            self.code = fb.get('code', -1)
            self.errstr = fb.get('errstr', None)

    def __init__(self, pre): 
        """
        Specialize the class for the prc method
        """
        self.RequestMessage = globals()["%sRequestMessage" % pre]
        self.ResponseMessage = globals()["%sResponseMessage" % pre]
        self.RequestBody="%sRequestBody" % pre
        self.ResponseBody="%sResponseBody" % pre
        self.method = pre
        self.RPCException = fedd_rpc.RPCException


    def add_ssh_key(self, option, opt_str, value, parser, access_keys):
        try:
            access_keys.append(access_method(file=value,
                type=access_method.type_ssh))
        except IOError, (errno, strerror):
            raise OptionValueError("Cannot generate sshPubkey from %s: "\
                    "%s (%d)" % (value,strerror,errno))

    def add_x509_cert(self, option, opt_str, value, parser, access_keys):
        try:
            access_keys.append(access_method(file=value,
                type=access_method.type_x509))
        except IOError, (errno, strerror):
            raise OptionValueError("Cannot read x509 cert from %s: %s (%d)" %
                    (value,strerror,errno))
    def add_node_desc(self, option, opt_str, value, parser, node_descs):
        def none_if_zero(x):
            if len(x) > 0: return x
            else: return None

        params = map(none_if_zero, value.split(":"));
        
        if len(params) < 4 and len(params) > 1:
            node_descs.append(node_desc(*params))
        else:
            raise OptionValueError("Bad node description: %s" % value)

    def get_user_info(self, access_keys):
        pw = pwd.getpwuid(os.getuid());
        try_cert=None
        user = None

        if pw != None:
            user = pw[0]
            try_cert = "%s/.ssl/emulab.pem" % pw[5];
            if not os.access(try_cert, os.R_OK):
                try_cert = None
            if len(access_keys) == 0:
                for k in ["%s/.ssh/id_rsa.pub", "%s/.ssh/id_dsa.pub", 
                        "%s/.ssh/identity.pub"]:
                    try_key = k % pw[5];
                    if os.access(try_key, os.R_OK):
                        access_keys.append(access_method(file=try_key,
                            type=access_method.type_ssh))
                        break
        return (user, try_cert)

    def do_rpc(self, req_dict, url, transport, cert, trusted, tracefile=None,
            serialize_only=False):
        """
        The work of sending and parsing the RPC as either XMLRPC or SOAP
        """

        context = None
        while context == None:
            try:
                context = fedd_ssl_context(cert, trusted)
            except SSL.SSLError, e:
                # Yes, doing this on message type is not ideal.  The string
                # comes from OpenSSL, so check there is this stops working.
                if str(e) == "bad decrypt": 
                    print >>sys.stderr, "Bad Passphrase given."
                else: raise

        if transport == "soap":
            loc = feddServiceLocator();
            port = loc.getfeddPortType(url,
                    transport=M2Crypto.httpslib.HTTPSConnection, 
                    transdict={ 'ssl_context' : context },
                    tracefile=tracefile)
            method_call = getattr(port, self.method, None)

            if not method_call:
                loc = feddInternalServiceLocator();
                port = loc.getfeddInternalPortType(url,
                        transport=M2Crypto.httpslib.HTTPSConnection, 
                        transdict={ 'ssl_context' : context },
                        tracefile=tracefile)
                method_call = getattr(port, self.method, None)
                if not method_call:
                    raise RuntimeError("Can't find method: %s" % self.method)

            req = self.RequestMessage()

            set_req = getattr(req, "set_element_%s" % self.RequestBody, None)
            set_req(pack_soap(req, self.RequestBody, req_dict))

            if serialize_only:
                sw = SoapWriter()
                sw.serialize(req)
                print str(sw)
                sys.exit(0)

            try:
                method_call = getattr(port, self.method, None)
                resp = method_call(req)
            except ZSI.ParseException, e:
                raise RuntimeError("Malformed response (XMLPRC?): %s" % e)
            except ZSI.FaultException, e:
                resp = e.fault.detail[0]

            if resp:
                resp_call = getattr(resp, "get_element_%s" %self.ResponseBody,
                        None)
                if resp_call: 
                    resp_body = resp_call()
                    if ( resp_body != None): 
                        try:
                            return unpack_soap(resp_body)
                        except RuntimeError, e:
                            raise RuntimeError("Bad response. %s" % e.message)
                elif 'get_element_FeddFaultBody' in dir(resp): 
                    resp_body = resp.get_element_FeddFaultBody()
                    if resp_body != None: 
                        try:
                            fb = unpack_soap(resp_body)
                        except RuntimeError, e:
                            raise RuntimeError("Bad response. %s" % e.message)
                        raise self.RPCException(fb)
                else: 
                    raise RuntimeError("No body in response!?")
            else: 
                raise RuntimeError("No response?!?")
        elif transport == "xmlrpc":
            if serialize_only:
                ser = dumps((req_dict,))
                print ser
                sys.exit(0)

            xtransport = SSL_Transport(context)
            port = ServerProxy(url, transport=xtransport)

            try:
                method_call = getattr(port, self.method, None)
                resp = method_call(
                        encapsulate_binaries({ self.RequestBody: req_dict},\
                            ('fedid',)))
            except Error, e:
                resp = { 'FeddFaultBody': \
                        { 'errstr' : getattr(e, "faultCode", "No fault code"),
                        'desc' : getattr(e, "faultString", "No fault string") }\
                        }
            if resp:
                if resp.has_key(self.ResponseBody): 
                    return decapsulate_binaries(resp[self.ResponseBody],
                            ('fedid',))
                elif resp.has_key('FeddFaultBody'):
                    raise self.RPCException(resp['FeddFaultBody'])
                else: 
                    raise RuntimeError("No body in response!?")
            else: 
                raise RuntimeError("No response?!?")
        else:
            raise RuntimeError("Unknown RPC transport: %s" % transport)

# Querying experiment data follows the same control flow regardless of the
# specific data retrieved.  This class encapsulates that control flow.
class exp_data(fedd_rpc):
    def __init__(self, op): 
        """
        Specialize the class for the type of data requested (op)
        """

        fedd_rpc.__init__(self, op)
        if op =='Vtopo':
            self.key="vtopo"
            self.xml='experiment'
        elif op == 'Vis':
            self.key="vis"
            self.xml='vis'
        elif op == 'Info': pass
        else:
            raise TypeError("Bad op: %s" % op)

    def print_xml(self, d, out=sys.stdout):
        """
        Print the retrieved data is a simple xml representation of the dict.
        """
        str = "<%s>\n" % self.xml
        for t in ('node', 'lan'):
            if d.has_key(t): 
                for x in d[t]:
                    str += "<%s>" % t
                    for k in x.keys():
                        str += "<%s>%s</%s>" % (k, x[k],k)
                    str += "</%s>\n" % t
        str+= "</%s>" % self.xml
        print >>out, str

    def __call__(self):
        """
        The control flow.  Compose the request and print the response.
        """
        # Process the options using the customized option parser defined above
        parser = fedd_exp_data_opts()

        (opts, args) = parser.parse_args()

        if opts.trusted != None:
            if ( not os.access(opts.trusted, os.R_OK) ) :
                sys.exit("Cannot read trusted certificates (%s)" % opts.trusted)
        else:
            parser.error("--trusted is required")

        if opts.debug > 0: opts.tracefile=sys.stderr

        if opts.cert != None: cert = opts.cert

        if cert == None:
            sys.exit("No certificate given (--cert) or found")

        if os.access(cert, os.R_OK):
            fid = fedid(file=cert)
        else:
            sys.exit("Cannot read certificate (%s)" % cert)

        if opts.exp_name and opts.exp_certfile:
            sys.exit("Only one of --experiment_cert and " +\
                    "--experiment_name permitted");

        if opts.exp_certfile:
            exp_id = { 'fedid': fedid(file=opts.exp_certfile) }

        if opts.exp_name:
            exp_id = { 'localname' : opts.exp_name }

        req = { 'experiment': exp_id }

        try:
            resp_dict = self.do_rpc(req,
                    opts.url, opts.transport, cert, opts.trusted, 
                    serialize_only=opts.serialize_only,
                    tracefile=opts.tracefile)
        except self.RPCException, e:
            exit_with_fault(\
                    {'desc': e.desc, 'errstr': e.errstr, 'code': e.code})
        except RuntimeError, e:
            print e
            sys.exit("Error processing RPC: %s" % e)

        if getattr(self, 'key', None):
            try:
                if resp_dict.has_key(self.key):
                    self.print_xml(resp_dict[self.key])
            except RuntimeError, e:
                sys.exit("Bad response. %s" % e.message)
        else:
            print resp_dict

class terminate(fedd_rpc):
    def __init__(self): 
        """
        Termination request
        """

        fedd_rpc.__init__(self, "Terminate")

    def __call__(self):
        """
        The control flow.  Compose the request and print the response.
        """
        # Process the options using the customized option parser defined above
        parser = fedd_exp_data_opts()

        (opts, args) = parser.parse_args()

        if opts.trusted != None:
            if ( not os.access(opts.trusted, os.R_OK) ) :
                sys.exit("Cannot read trusted certificates (%s)" % opts.trusted)
        else:
            parser.error("--trusted is required")

        if opts.debug > 0: opts.tracefile=sys.stderr

        if opts.cert != None: cert = opts.cert

        if cert == None:
            sys.exit("No certificate given (--cert) or found")

        if os.access(cert, os.R_OK):
            fid = fedid(file=cert)
        else:
            sys.exit("Cannot read certificate (%s)" % cert)

        if opts.exp_name and opts.exp_certfile:
            sys.exit("Only one of --experiment_cert and " +\
                    "--experiment_name permitted");

        if opts.exp_certfile:
            exp_id = { 'fedid': fedid(file=opts.exp_certfile) }

        if opts.exp_name:
            exp_id = { 'localname' : opts.exp_name }

        req = { 'experiment': exp_id }

        try:
            resp_dict = self.do_rpc(req,
                    opts.url, opts.transport, cert, opts.trusted, 
                    serialize_only=opts.serialize_only,
                    tracefile=opts.tracefile)
        except self.RPCException, e:
            exit_with_fault(\
                    {'desc': e.desc, 'errstr': e.errstr, 'code': e.code})
        except RuntimeError, e:
            print e
            sys.exit("Error processing RPC: %s" % e)

        eid = resp_dict.get('experimentID', None)
        if eid:
            for id in eid:
                for k in id.keys():
                    if k == 'fedid': print "%s: %s" % (k,fedid(bits=id[k]))
                    else: print "%s: %s" % (k, id[k])

class create(fedd_rpc):
    def __init__(self): 
        fedd_rpc.__init__(self, "Create")
    def __call__(self):
        access_keys = []
        # Process the options using the customized option parser defined above
        parser = fedd_create_opts(access_keys, self.add_ssh_key,
                self.add_x509_cert)

        (opts, args) = parser.parse_args()

        if opts.trusted != None:
            if ( not os.access(opts.trusted, os.R_OK) ) :
                sys.exit("Cannot read trusted certificates (%s)" % opts.trusted)
        else:
            parser.error("--trusted is required")

        if opts.debug > 0: opts.tracefile=sys.stderr

        (user, cert) = self.get_user_info(access_keys)

        if opts.user: user = opts.user

        if opts.cert != None: cert = opts.cert

        if cert == None:
            sys.exit("No certificate given (--cert) or found")

        if os.access(cert, os.R_OK):
            fid = fedid(file=cert)
            if opts.use_fedid == True:
                user = fid
        else:
            sys.exit("Cannot read certificate (%s)" % cert)

        if opts.file:
            exp_desc = ""
            try:
                f = open(opts.file, 'r')
                for line in f:
                    exp_desc += line
                f.close()
            except IOError:
                sys.exit("Cannot read description file (%s)" %opts.file)
        else:
            sys.exit("Must specify an experiment description (--file)")

        if not opts.master:
            sys.exit("Must specify a master testbed (--master)")

        out_certfile = opts.out_certfile

        msg = {
                'experimentdescription': { 'ns2description': exp_desc },
                'master': opts.master,
                'user' : [ {\
                        'userID': pack_id(user), \
                        'access': [ { a.type: a.buf } for a in access_keys]\
                        } ]
                }

        if opts.exp_name:
            msg['experimentID'] = { 'localname': opts.exp_name }

        if opts.debug > 1: print >>sys.stderr, msg

        try:
            resp_dict = self.do_rpc(msg, 
                    opts.url, opts.transport, cert, opts.trusted, 
                    serialize_only=opts.serialize_only,
                    tracefile=opts.tracefile)
        except self.RPCException, e:
            exit_with_fault(\
                    {'desc': e.desc, 'errstr': e.errstr, 'code': e.code})
        except RuntimeError, e:
            sys.exit("Error processing RPC: %s" % e)

        if opts.debug > 1: print >>sys.stderr, resp_dict

        ea = resp_dict.get('experimentAccess', None)
        if out_certfile and ea and ea.has_key('X509'):
            try:
                f = open(out_certfile, "w")
                print >>f, ea['X509']
                f.close()
            except IOError:
                sys.exit('Could not write to %s' %  out_certfile)
        eid = resp_dict.get('experimentID', None)
        if eid:
            for id in eid:
                for k in id.keys():
                    if k == 'fedid': print "%s: %s" % (k,fedid(bits=id[k]))
                    else: print "%s: %s" % (k, id[k])

class split(fedd_rpc):
    def __init__(self): 
        fedd_rpc.__init__(self, "Ns2Split")
    def __call__(self):
        access_keys = []
        # Process the options using the customized option parser defined above
        parser = fedd_split_opts(access_keys, self.add_ssh_key,
                self.add_x509_cert)

        (opts, args) = parser.parse_args()

        if opts.trusted != None:
            if ( not os.access(opts.trusted, os.R_OK) ) :
                sys.exit("Cannot read trusted certificates (%s)" % opts.trusted)
        else:
            parser.error("--trusted is required")

        if opts.debug > 0: opts.tracefile=sys.stderr

        if opts.cert != None: cert = opts.cert
        else: cert = None

        if cert == None:
            sys.exit("No certificate given (--cert) or found")

        if os.access(cert, os.R_OK):
            fid = fedid(file=cert)
            if opts.use_fedid == True:
                user = fid
        else:
            sys.exit("Cannot read certificate (%s)" % cert)

        if opts.file:
            exp_desc = ""
            try:
                f = open(opts.file, 'r')
                for line in f:
                    exp_desc += line
                f.close()
            except IOError:
                sys.exit("Cannot read description file (%s)" %opts.file)
        else:
            sys.exit("Must specify an experiment description (--file)")

        if not opts.master:
            sys.exit("Must specify a master testbed (--master)")

        out_certfile = opts.out_certfile

        msg = {
                'description': { 'ns2description': exp_desc },
                'master': opts.master,
                'include_fedkit': opts.fedkit,
                }

        if opts.debug > 1: print >>sys.stderr, msg

        try:
            resp_dict = self.do_rpc(msg, 
                    opts.url, opts.transport, cert, opts.trusted, 
                    serialize_only=opts.serialize_only,
                    tracefile=opts.tracefile)
        except self.RPCException, e:
            exit_with_fault(\
                    {'desc': e.desc, 'errstr': e.errstr, 'code': e.code})
        except RuntimeError, e:
            sys.exit("Error processing RPC: %s" % e)

        if opts.debug > 1: print >>sys.stderr, resp_dict

        out = resp_dict.get('output', None)

        for line in out.splitlines():
            print "%s" % line

class access(fedd_rpc):
    def __init__(self):
        fedd_rpc.__init__(self, "RequestAccess")

    def print_response_as_testbed(self, resp, label, out=sys.stdout):
        """Print the response as input to the splitter script"""

        e = resp['emulab']
        p = e['project']
        fields = { 
                "Boss": e['boss'],
                "OpsNode": e['ops'],
                "Domain": e['domain'],
                "FileServer": e['fileServer'],
                "EventServer": e['eventServer'],
                "Project": unpack_id(p['name'])
                }
        if (label != None): print >> out, "[%s]" % label

        for l, v in fields.iteritems():
            print >>out, "%s: %s" % (l, v)

        for u in p['user']:
            print >>out, "User: %s" % unpack_id(u['userID'])

        for a in e['fedAttr']:
            print >>out, "%s: %s" % (a['attribute'], a['value'])

    def __call__(self):
        access_keys = []
        node_descs = []
        proj = None

        # Process the options using the customized option parser defined above
        parser = fedd_access_opts(access_keys, node_descs, self.add_ssh_key,
                self.add_x509_cert, self.add_node_desc)

        (opts, args) = parser.parse_args()

        if opts.testbed == None:
            parser.error("--testbed is required")

        if opts.trusted != None:
            if ( not os.access(opts.trusted, os.R_OK) ) :
                sys.exit("Cannot read trusted certificates (%s)" % opts.trusted)
        else:
            parser.error("--trusted is required")

        if opts.debug > 0: opts.tracefile=sys.stderr

        (user, cert) = self.get_user_info(access_keys)

        if opts.user: user = opts.user

        if opts.cert != None: cert = opts.cert

        if cert == None:
            sys.exit("No certificate given (--cert) or found")

        if os.access(cert, os.R_OK):
            fid = fedid(file=cert)
            if opts.use_fedid == True:
                user = fid
        else:
            sys.exit("Cannot read certificate (%s)" % cert)

        msg = {
                'allocID': pack_id('test alloc'),
                'destinationTestbed': pack_id(opts.testbed),
                'serviceAccess' : [ { a.type: a.buf } for a in access_keys ],
                'createAccess' : [ { a.type: a.buf } for a in access_keys ],
                }

        if len(node_descs) > 0:
            msg['resources'] = { 
                    'node': [ 
                        { 
                            'image':  n.image ,
                            'hardware':  n.hardware,
                            'count': n.count,
                        } for n in node_descs],
                    }

        if opts.project != None:
            if not opts.anonymous and user != None:
                msg['project'] = {
                        'name': pack_id(opts.project),
                        'user': [ { 'userID': pack_id(user) } ],
                        }
            else:
                msg['project'] = { 'name': pack_id(opts.project) }
        else:
            if not opts.anonymous and user != None:
                msg['user'] = [ { 'userID': pack_id(user) } ]
            else:
                msg['user'] = [];

        if opts.debug > 1: print >>sys.stderr, msg

        try:
            resp_dict = self.do_rpc(msg, 
                    opts.url, opts.transport, cert, opts.trusted, 
                    serialize_only=opts.serialize_only,
                    tracefile=opts.tracefile)
        except self.RPCException, e:
            exit_with_fault(\
                    {'desc': e.desc, 'errstr': e.errstr, 'code': e.code})
        except RuntimeError, e:
            sys.exit("Error processing RPC: %s" % e.message)

        if opts.debug > 1: print >>sys.stderr, resp_dict
        self.print_response_as_testbed(resp_dict, opts.label)

cmds = {\
        'create': create(),\
        'split': split(),\
        'access': access(),\
        'vtopo': exp_data('Vtopo'),\
        'vis': exp_data('Vis'),\
        'info': exp_data('Info'),\
        'terminate': terminate(),\
    }

operation = cmds.get(sys.argv[1], None)
if operation:
    del sys.argv[1]
    operation()
else:
    sys.exit("Bad command: %s.  Valid ones are: %s" % \
            (sys.argv[1], ", ".join(cmds.keys())))