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#!/usr/bin/env python
# License: MIT
# Copyright 2019 by Sysmocom s.f.m.c. GmbH
# Author: Alexander Couzens <lynxis@fe80.eu>
import struct
GSMTAP_VERSION = 0x02
GSMTAP_TYPE_OSMOCORE_LOG = 0x10
class TooSmall(RuntimeError):
pass
# struct gsmtap_hdr {
# uint8_t version; /*!< version, set to 0x01 currently */
# uint8_t hdr_len; /*!< length in number of 32bit words */
# uint8_t type; /*!< see GSMTAP_TYPE_* */
# uint8_t timeslot; /*!< timeslot (0..7 on Um) */
#
# uint16_t arfcn; /*!< ARFCN (frequency) */
# int8_t signal_dbm; /*!< signal level in dBm */
# int8_t snr_db; /*!< signal/noise ratio in dB */
#
# uint32_t frame_number; /*!< GSM Frame Number (FN) */
#
# uint8_t sub_type; /*!< Type of burst/channel, see above */
# uint8_t antenna_nr; /*!< Antenna Number */
# uint8_t sub_slot; /*!< sub-slot within timeslot */
# uint8_t res; /*!< reserved for future use (RFU) */
#
# }
class gsmtap_hdr():
def __init__(self, data):
if len(data) < 2:
raise TooSmall()
self.version, self.hdr_len = struct.unpack('!BB', data[0:2])
self.hdr_len *= 4
if self.hdr_len >= 3:
self.type = struct.unpack('!B', data[2:3])[0]
# /*! Structure of the GSMTAP libosmocore logging header */
# struct gsmtap_osmocore_log_hdr {
# struct {
# uint32_t sec;
# uint32_t usec;
# } ts;
# char proc_name[16]; /*!< name of process */
# uint32_t pid; /*!< process ID */
# uint8_t level; /*!< logging level */
# uint8_t _pad[3];
# /* TODO: color */
# char subsys[16]; /*!< logging sub-system */
# struct {
# char name[32]; /*!< source file name */
# uint32_t line_nr;/*!< line number */
# } src_file;
# } __attribute__((packed));
class gsmtap_log():
def __init__(self, data):
packformat = '!II16sIBxxx16s32sI'
packlen = struct.calcsize(packformat)
if len(data) < packlen:
raise TooSmall()
self.sec, self.usec, \
self.proc_name, self.pid, \
self.level, self.subsys, \
self.filename, self.fileline_nr = struct.unpack(packformat, data[:packlen])
message_len = len(data) - packlen
if message_len > 0:
self.message = data[packlen:].decode('utf-8')
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