mirror of
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130 lines
4.4 KiB
Python
130 lines
4.4 KiB
Python
#!/usr/bin/python
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# -*- coding: cp1252 -*-
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"""
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POCSAG Decoder
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@author: Bastian Schroll
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@author: Jens Herrmann
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@requires: Configuration has to be set in the config.ini
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"""
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import logging
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import time #timestamp for doublealarm
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import re #Regex for validation
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from includes import globals # Global variables
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##
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#
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# Simple Filter
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#
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def isAllowed(poc_id):
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"""
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Simple Filter Functions (Allowed, Denied and Range)
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@type poc_id: string
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@param poc_id: POCSAG Ric
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@requires: Configuration has to be set in the config.ini
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@return: True if the Ric is allowed, other False
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@exception: none
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"""
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# 1.) If allowed RICs is set, only they will path,
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# If RIC is the right one return True, else False
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if globals.config.get("POC", "allow_ric"):
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if poc_id in globals.config.get("POC", "allow_ric"):
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logging.info("RIC %s is allowed", poc_id)
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return True
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else:
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logging.info("RIC %s is not in the allowed list", poc_id)
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return False
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# 2.) If denied RIC, return False
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elif poc_id in globals.config.get("POC", "deny_ric"):
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logging.info("RIC %s is denied by config.ini", poc_id)
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return False
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# 3.) Check Range, return False if outside def. range
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elif int(poc_id) < globals.config.getint("POC", "filter_range_start"):
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logging.info("RIC %s out of filter range (start)", poc_id)
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return False
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elif int(poc_id) > globals.config.getint("POC", "filter_range_end"):
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logging.info("RIC %s out of filter range (end)", poc_id)
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return False
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return True
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##
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#
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# POCSAG Decoder Function
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# validate -> check double alarm -> log
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#
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def decode(freq, decoded):
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"""
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Export POCSAG Information from Multimon-NG RAW String and call alarmHandler.processAlarm()
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@type freq: string
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@param freq: frequency of the SDR Stick
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@type decoded: string
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@param decoded: RAW Information from Multimon-NG
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@requires: Configuration has to be set in the config.ini
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@return: nothing
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@exception: Exception if POCSAG decode failed
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"""
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bitrate = 0
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timestamp = int(time.time())#Get Timestamp
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if "POCSAG512:" in decoded:
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bitrate = 512
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poc_id = decoded[20:27].replace(" ", "").zfill(7)
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poc_sub = decoded[39].replace("3", "4").replace("2", "3").replace("1", "2").replace("0", "1")
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elif "POCSAG1200:" in decoded:
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bitrate = 1200
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poc_id = decoded[21:28].replace(" ", "").zfill(7)
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poc_sub = decoded[40].replace("3", "4").replace("2", "3").replace("1", "2").replace("0", "1")
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elif "POCSAG2400:" in decoded:
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bitrate = 2400
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poc_id = decoded[21:28].replace(" ", "").zfill(7)
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poc_sub = decoded[40].replace("3", "4").replace("2", "3").replace("1", "2").replace("0", "1")
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if bitrate is 0:
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logging.warning("POCSAG Bitrate not found")
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logging.debug(" - (%s)", decoded)
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else:
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logging.debug("POCSAG Bitrate: %s", bitrate)
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if "Alpha:" in decoded: #check if there is a text message
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poc_text = decoded.split('Alpha: ')[1].strip().rstrip('<EOT>').strip()
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else:
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poc_text = ""
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if re.search("[0-9]{7}", poc_id): #if POC is valid
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if isAllowed(poc_id):
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#check for double alarm
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if poc_id == globals.poc_id_old and timestamp < globals.poc_time_old + globals.config.getint("POC", "double_ignore_time"):
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logging.info("POCSAG%s double alarm: %s within %s second(s)", bitrate, globals.poc_id_old, timestamp-globals.poc_time_old)
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#in case of double alarm, poc_double_ignore_time set new
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globals.poc_time_old = timestamp
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else:
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logging.info("POCSAG%s: %s %s %s ", bitrate, poc_id, poc_sub, poc_text)
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data = {"ric":poc_id, "function":poc_sub, "msg":poc_text, "bitrate":bitrate, "description":poc_id}
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# Add function as character a-d to dataset
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data["functionChar"] = data["function"].replace("1", "a").replace("2", "b").replace("3", "c").replace("4", "d")
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# If enabled, look up description
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if globals.config.getint("POC", "idDescribed"):
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from includes import descriptionList
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data["description"] = descriptionList.getDescription("POC", poc_id)
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# processing the alarm
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from includes import alarmHandler
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alarmHandler.processAlarm("POC",freq,data)
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globals.poc_id_old = poc_id #save last id
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globals.poc_time_old = timestamp #save last time
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else:
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logging.debug("POCSAG%s: %s is not allowed", bitrate, poc_id)
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else:
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logging.warning("No valid POCSAG%s RIC: %s", bitrate, poc_id) |