112 lines
4.3 KiB
Python
Executable File
112 lines
4.3 KiB
Python
Executable File
#!/usr/bin/env python3
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# MIT License
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#
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# Copyright (c) 2021 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
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# Author: Pau Espin Pedrol <pespin@sysmocom.de>
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#
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# SPDX-License-Identifier: MIT
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice (including the next
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# paragraph) shall be included in all copies or substantial portions of the
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# Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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import socket
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import argparse
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import struct
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from ipaddress import ip_address, IPv4Address
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GTP1C_PORT = 2123
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BUF_SIZE = 4096
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GTP_HDRv1_FLAG_PN = (1<<0)
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GTP_HDRv1_FLAG_S = (1<<1)
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GTP_HDRv1_FLAG_E = (1<<2)
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GTP_HDRv1_PT_GTP = (1<<4)
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GTP_HDRv1_VER_GTP1 = (1<<5)
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GTP_HDRv2_FLAG_T = (1<<3)
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GTP_HDRv2_FLAG_P = (1<<4)
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GTP_HDRv2_VER_GTP2 = (2<<5)
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def gen_gtpc_v1_hdr(flags, type, length, tei, seq=0, npdu=0, next=0):
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spare = 0
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if (flags & (GTP_HDRv1_FLAG_PN|GTP_HDRv1_FLAG_S|GTP_HDRv1_FLAG_E)):
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#long format
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length += 4
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d = struct.pack('!BBHIHBB', flags, type, length, tei, seq, npdu, next)
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else:
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#short format
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d = struct.pack('!BBHI', flags, type, length, tei)
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return d
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def gen_gtpc_v2_hdr(flags, type, length, tei=0, seq=0):
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spare = 0
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if (flags & (GTP_HDRv2_FLAG_T)):
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#long format, with TEI
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length += 4 + 4
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d = struct.pack('!BBHIHBB', flags, type, length, tei, seq >> 8, seq & 0xff, spare)
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else:
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#short format
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length += 4
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d = struct.pack('!BBHHBB', flags, type, length, seq >> 8, seq & 0xff, spare)
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return d
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def gen_gtpc_v1_echo_req(tei=0, append_flags=0, seq=0, npdu=0, next=0):
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return gen_gtpc_v1_hdr(GTP_HDRv1_VER_GTP1 | GTP_HDRv1_PT_GTP | append_flags, 1, 0, tei, seq, npdu, next)
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def gen_gtpc_v2_echo_req(append_flags=0, seq=0, recovery=0, node_features=-1):
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length = 0
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payload = b''
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if (recovery > 0):
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recovery_ie = struct.pack('!BHBB', 3, 1, 0, recovery)
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payload += recovery_ie
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length += len(recovery_ie)
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if (node_features > 0):
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node_features_ie = struct.pack('!BHBB', 152, 1, 0, node_features)
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payload += node_features_ie
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length += len(node_features_ie)
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return gen_gtpc_v2_hdr(GTP_HDRv2_VER_GTP2 | append_flags, 1, length, 0, seq) + payload
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def tx_rx(sk, rem_addr, tx_buf, exp_rx = True):
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print('Tx ECHO_REQ to %r: %r' % (repr(rem_addr), repr(tx_buf)))
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sk.sendto(tx_buf, rem_addr)
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if exp_rx:
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rx_buf = sk.recvfrom(BUF_SIZE)
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msg = "Message from Server {}".format(rx_buf)
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print(msg)
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if __name__ == '__main__':
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p = argparse.ArgumentParser(description='Tester for gtp-echo-recorder.')
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p.add_argument('-l', '--local-address', default='127.0.0.2', help="Local GTP address")
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p.add_argument('-r', '--remote-address', default='127.0.0.1', help="Remote GTP address")
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args = p.parse_args()
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print('Binding socket on %r...' % repr((args.local_address, GTP1C_PORT)))
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family = socket.AF_INET if type(ip_address(args.local_address)) is IPv4Address else socket.AF_INET6
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sk = socket.socket(family=family, type=socket.SOCK_DGRAM)
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sk.bind((args.local_address, GTP1C_PORT));
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rem_addr = (args.remote_address, GTP1C_PORT)
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tx_rx(sk, rem_addr, gen_gtpc_v1_echo_req())
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tx_rx(sk, rem_addr, gen_gtpc_v1_echo_req(1, GTP_HDRv1_FLAG_S, seq=67))
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tx_rx(sk, rem_addr, gen_gtpc_v2_echo_req(0, seq=300, recovery=-1, node_features=-1))
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tx_rx(sk, rem_addr, gen_gtpc_v2_echo_req(0, seq=20, recovery=99, node_features=-1))
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tx_rx(sk, rem_addr, gen_gtpc_v2_echo_req(0, seq=20, recovery=100, node_features=0xbb))
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