#!/usr/bin/env python3
"""
SPDX-License-Identifier: MIT
Copyright 2019 sysmocom s.f.m.c GmbH <info@sysmocom.de>
WARNING: this is just a proof-of-concept implementation, it blocks for every
received SMPP request and is not suitable for servicing more than one request
at a time.
Based on esme.py from RCCN (license changed with permission from author):
https://github.com/Rhizomatica/rccn/blob/master/rccn/esme.py
Copyright 2017 keith <keith@rhizomatica.org>
Forward SMS to the receiver's SMSC, as determined with mslookup.
Requires smpplip (pip3 install --user smpplib) and osmo-mslookup-client.
Example SMPP configuration for osmo-msc.cfg:
smpp
local-tcp-ip 127.0.0.1 2775
policy closed
smpp-first
# outgoing to esme_dgsm.py
esme OSMPP
no alert-notifications
password foo
default-route
# incoming from esme_dgsm.py
esme ISMPP
no alert-notifications
password foo
"""
import argparse
import json
import logging
import smpplib
import subprocess
import time
def can_handle_pdu(pdu):
if not isinstance(pdu, smpplib.command.DeliverSM):
logging.info('PDU is not a DeliverSM, ignoring')
return False
if int(pdu.dest_addr_ton) == smpplib.consts.SMPP_TON_INTL:
logging.info("Unable to handle SMS for %s: SMPP_TON_INTL" %
(pdu.destination_addr))
return False
return True
def query_mslookup(service_type, id, id_type='msisdn'):
query_str = '%s.%s.%s' % (service_type, id, id_type)
logging.info('mslookup: ' + query_str)
result_line = subprocess.check_output(['osmo-mslookup-client', query_str,
'-f', 'json'])
if isinstance(result_line, bytes):
result_line = result_line.decode('ascii')
logging.info('mslookup result: ' + result_line.rstrip())
return json.loads(result_line)
def tx_sms(dst_host, dst_port, source, destination, registered_delivery,
unicode_text):
smpp_client = smpplib.client.Client(dst_host, dst_port, 90)
smpp_client.connect()
smpp_client.bind_transceiver(system_id=args.dst_id, password=args.dst_pass)
logging.info('Connected to destination SMSC (%s@%s:%s)' % (args.dst_id,
dst_host, dst_port))
pdu = smpp_client.send_message(
source_addr_ton=smpplib.consts.SMPP_TON_ALNUM,
source_addr_npi=smpplib.consts.SMPP_NPI_UNK,
source_addr=source.decode(),
dest_addr_ton=smpplib.consts.SMPP_TON_SBSCR,
dest_addr_npi=smpplib.consts.SMPP_NPI_ISDN,
destination_addr=destination.decode(),
short_message=unicode_text,
registered_delivery=registered_delivery,
)
smpp_client.unbind()
smpp_client.disconnect()
del pdu
del smpp_client
def rx_deliver_sm(pdu):
if not can_handle_pdu(pdu):
return smpplib.consts.SMPP_ESME_RSYSERR
msisdn = pdu.destination_addr.decode()
logging.info("Incoming SMS for: " + msisdn)
if args.sleep:
logging.info("Sleeping for %i seconds" % (args.sleep))
time.sleep(args.sleep)
logging.info("Sleep done")
if args.always_fail is not None:
return args.always_fail
result = query_mslookup("smpp.sms", msisdn)
if 'v4' not in result or not result['v4']:
logging.info('No IPv4 result from mslookup! This example only'
' makes use of IPv4, dropping.')
return smpplib.consts.SMPP_ESME_RSYSERR
dst_host, dst_port = result['v4']
tx_sms(dst_host, dst_port, pdu.source_addr,
pdu.destination_addr, int(pdu.registered_delivery),
pdu.short_message)
return smpplib.consts.SMPP_ESME_ROK
def smpp_bind():
client = smpplib.client.Client(args.src_host, args.src_port, 90)
client.set_message_received_handler(rx_deliver_sm)
client.connect()
client.bind_transceiver(system_id=args.src_id, password=args.src_pass)
logging.info('Connected to source SMSC (%s@%s:%s)' % (args.src_id,
args.src_host, args.src_port))
logging.info('Waiting for SMS...')
client.listen()
def main():
global args
parser = argparse.ArgumentParser()
parser.add_argument('--src-host', default='127.0.0.1',
help='source SMSC (OsmoMSC) host (default: 127.0.0.1)')
parser.add_argument('--src-port', default=2775, type=int,
help='source SMSC (OsmoMSC) port (default: 2775)')
parser.add_argument('--src-id', default='OSMPP',
help='source system id, as configured in osmo-msc.cfg'
' (default: OSMPP)')
parser.add_argument('--src-pass', default='foo',
help='source system password, as configured in'
' osmo-msc.cfg (default: foo)')
parser.add_argument('--dst-id', default='ISMPP',
help='destination system id, as configured in'
' osmo-msc.cfg (default: ISMPP)')
parser.add_argument('--dst-pass', default='foo',
help='destination system password, as configured in'
' osmo-msc.cfg (default: foo)')
parser.add_argument('--sleep', default=0, type=float,
help='sleep time in seconds before forwarding an SMS,'
' to test multithreading (default: 0)')
parser.add_argument('--always-fail', default=None, metavar='SMPP_ESME_ERRCODE',
help='test delivery failure: always return an error code on Deliver-SM,'
' pass an smpplib error code name like RDELIVERYFAILURE (see smpplib/consts.py),'
' or an SMPP error code in hex digits')
args = parser.parse_args()
logging.basicConfig(level=logging.INFO, format='[%(asctime)s]'
' (%(threadName)s) %(message)s', datefmt="%H:%M:%S")
if args.always_fail:
resolved = None
name = 'SMPP_ESME_' + args.always_fail
if hasattr(smpplib.consts, name):
resolved = getattr(smpplib.consts, name)
if resolved is None:
try:
resolved = int(args.always_fail, 16)
except ValueError:
resolved = None
if resolved is None:
print('Invalid argument for --always-fail: %r' % args.always_fail)
exit(1)
args.always_fail = resolved
logging.info('--always-fail: returning error code %s to all Deliver-SM' % hex(args.always_fail))
smpp_bind()
if __name__ == "__main__":
main()
# vim: expandtab tabstop=4 shiftwidth=4