Alexander Couzens | 9b20741 | 2019-05-27 03:44:39 +0200 | [diff] [blame] | 1 | #!/usr/bin/env python |
| 2 | # License: MIT |
| 3 | # Copyright 2019 by Sysmocom s.f.m.c. GmbH |
| 4 | # Author: Alexander Couzens <lynxis@fe80.eu> |
| 5 | |
| 6 | import struct |
| 7 | |
| 8 | GSMTAP_VERSION = 0x02 |
| 9 | |
| 10 | GSMTAP_TYPE_OSMOCORE_LOG = 0x10 |
| 11 | |
| 12 | class TooSmall(RuntimeError): |
| 13 | pass |
| 14 | |
| 15 | # struct gsmtap_hdr { |
| 16 | # uint8_t version; /*!< version, set to 0x01 currently */ |
| 17 | # uint8_t hdr_len; /*!< length in number of 32bit words */ |
| 18 | # uint8_t type; /*!< see GSMTAP_TYPE_* */ |
| 19 | # uint8_t timeslot; /*!< timeslot (0..7 on Um) */ |
| 20 | # |
| 21 | # uint16_t arfcn; /*!< ARFCN (frequency) */ |
| 22 | # int8_t signal_dbm; /*!< signal level in dBm */ |
| 23 | # int8_t snr_db; /*!< signal/noise ratio in dB */ |
| 24 | # |
| 25 | # uint32_t frame_number; /*!< GSM Frame Number (FN) */ |
| 26 | # |
| 27 | # uint8_t sub_type; /*!< Type of burst/channel, see above */ |
| 28 | # uint8_t antenna_nr; /*!< Antenna Number */ |
| 29 | # uint8_t sub_slot; /*!< sub-slot within timeslot */ |
| 30 | # uint8_t res; /*!< reserved for future use (RFU) */ |
| 31 | # |
| 32 | # } |
| 33 | |
| 34 | class gsmtap_hdr(): |
| 35 | def __init__(self, data): |
| 36 | if len(data) < 2: |
| 37 | raise TooSmall() |
| 38 | self.version, self.hdr_len = struct.unpack('!BB', data[0:2]) |
| 39 | self.hdr_len *= 4 |
| 40 | |
| 41 | if self.hdr_len >= 3: |
| 42 | self.type = struct.unpack('!B', data[2:3])[0] |
| 43 | |
| 44 | # /*! Structure of the GSMTAP libosmocore logging header */ |
| 45 | # struct gsmtap_osmocore_log_hdr { |
| 46 | # struct { |
| 47 | # uint32_t sec; |
| 48 | # uint32_t usec; |
| 49 | # } ts; |
| 50 | # char proc_name[16]; /*!< name of process */ |
| 51 | # uint32_t pid; /*!< process ID */ |
| 52 | # uint8_t level; /*!< logging level */ |
| 53 | # uint8_t _pad[3]; |
| 54 | # /* TODO: color */ |
| 55 | # char subsys[16]; /*!< logging sub-system */ |
| 56 | # struct { |
| 57 | # char name[32]; /*!< source file name */ |
| 58 | # uint32_t line_nr;/*!< line number */ |
| 59 | # } src_file; |
| 60 | # } __attribute__((packed)); |
| 61 | |
| 62 | class gsmtap_log(): |
| 63 | def __init__(self, data): |
| 64 | packformat = '!II16sIBxxx16s32sI' |
| 65 | packlen = struct.calcsize(packformat) |
| 66 | if len(data) < packlen: |
| 67 | raise TooSmall() |
| 68 | self.sec, self.usec, \ |
| 69 | self.proc_name, self.pid, \ |
| 70 | self.level, self.subsys, \ |
| 71 | self.filename, self.fileline_nr = struct.unpack(packformat, data[:packlen]) |
| 72 | |
| 73 | message_len = len(data) - packlen |
| 74 | if message_len > 0: |
| 75 | self.message = data[packlen:].decode('utf-8') |