1#!/usr/bin/perl 2# 3# This script extracts the ASN1 definition from TS 36.331/36.355/25.331/38.331/37.355/36.413/38.413/36.423/38.423 4# /38.463/38.473 , and generates asn files that can be processed by asn2wrs 5# First download the specification from 3gpp.org as a word document and open it 6# Then in "view" menu, select normal, draft or web layout (any kind that removes page header and footers) 7# Finally save the document as a text file 8# Example with TS 36.331: "perl extract_asn1_from_spec.pl 36331-xxx.txt" 9# It should generate: EUTRA-RRC-Definitions.asn, EUTRA-UE-Variables.asn and EUTRA-InterNodeDefinitions 10# 11# Copyright 2011 Vincent Helfre and Erwan Yvin 12# 13# Wireshark - Network traffic analyzer 14# By Gerald Combs <gerald@wireshark.org> 15# Copyright 1998 Gerald Combs 16# 17# SPDX-License-Identifier: GPL-2.0-or-later 18 19use warnings; 20$input_file = $ARGV[0]; 21$version = 0; 22 23sub extract_spec_version; 24sub extract_asn1; 25 26open(INPUT_FILE, "< $input_file") or die "Can not open file $input_file"; 27 28extract_spec_version(); 29 30extract_asn1(); 31 32close(INPUT_FILE); 33 34# This subroutine extracts the version of the specification 35sub extract_spec_version { 36 my $line; 37 while($line = <INPUT_FILE>){ 38 if($line =~ m/3GPP TS ((25|36|38)\.331|(36|37)\.355|(36|38)\.413|(36|38)\.423|(36|38)\.455|38\.463|38\.473) V/){ 39 $version = $line; 40 return; 41 } 42 } 43} 44 45# This subroutine copies the text delimited by -- ASN1START and -- ASN1STOP in INPUT_FILE 46# and copies it into OUTPUT_FILE. 47# The OUTPUT_FILE is opened on encounter of the keyword "DEFINITIONS AUTOMATIC TAGS" 48# and closed on encounter of the keyword "END" 49sub extract_asn1 { 50 my $line; 51 my $prev_line; 52 my $is_asn1 = 0; 53 my $output_file_name = 0; 54 my $file_name_found = 0; 55 56 while($line = <INPUT_FILE>){ 57 if ($line =~ m/-- ASN1STOP/) { 58 $is_asn1 = 0; 59 } 60 61 if(($file_name_found == 0) && ($line =~ m/^LPP-Broadcast-Definitions/)){ 62 $output_file_name = "LPP-Broadcast-Definitions.asn"; 63 print "generating $output_file_name\n"; 64 open(OUTPUT_FILE, "> $output_file_name") or die "Can not open file $output_file_name"; 65 $file_name_found = 1; 66 syswrite OUTPUT_FILE,"-- "."$version"."\n"; 67 } 68 69 if(($file_name_found == 0) && ($line =~ m/SonTransfer-IEs/)){ 70 $output_file_name = "S1AP-SonTransfer-IEs.asn"; 71 print "generating $output_file_name\n"; 72 open(OUTPUT_FILE, "> $output_file_name") or die "Can not open file $output_file_name"; 73 $is_asn1 = 1; 74 $file_name_found = 1; 75 syswrite OUTPUT_FILE,"-- "."$version"."\n"; 76 } 77 78 if(($file_name_found == 0) && ($line =~ m/itu-t \(0\) identified-organization \(4\) etsi \(0\) mobileDomain \(0\)/)){ 79 ($output_file_name) = ($prev_line =~ m/^([a-zA-Z0-9\-]+)\s/); 80 $output_file_name = "$output_file_name".".asn"; 81 print "generating $output_file_name\n"; 82 open(OUTPUT_FILE, "> $output_file_name") or die "Can not open file $output_file_name"; 83 $is_asn1 = 1; 84 $file_name_found = 1; 85 syswrite OUTPUT_FILE,"-- "."$version"."\n"; 86 syswrite OUTPUT_FILE,"$prev_line"; 87 } 88 89 if(($file_name_found == 0) && ($line =~ m/DEFINITIONS AUTOMATIC TAGS ::=/)){ 90 ($output_file_name) = ($line =~ m/^([a-zA-Z0-9\-]+)\s+DEFINITIONS AUTOMATIC TAGS ::=/); 91 $output_file_name = "$output_file_name".".asn"; 92 print "generating $output_file_name\n"; 93 open(OUTPUT_FILE, "> $output_file_name") or die "Can not open file $output_file_name"; 94 $is_asn1 = 1; 95 $file_name_found = 1; 96 syswrite OUTPUT_FILE,"-- "."$version"."\n"; 97 } 98 99 if (($line =~ /^END[\r\n]/) && (defined fileno OUTPUT_FILE)){ 100 syswrite OUTPUT_FILE,"$line"; 101 close(OUTPUT_FILE); 102 $is_asn1 = 0; 103 $file_name_found = 0; 104 } 105 106 if (($is_asn1 == 1) && (defined fileno OUTPUT_FILE)){ 107 syswrite OUTPUT_FILE,"$line"; 108 } 109 110 if ($line =~ m/-- ASN1START/) { 111 $is_asn1 = 1; 112 } 113 114 $prev_line = $line; 115 } 116} 117 118