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| 1 | +#!/usr/bin/perl -w |
| 2 | +# |
| 3 | +# Build a static ASN.1 Object Identified (OID) registry |
| 4 | +# |
| 5 | +# Copyright (C) 2012 Red Hat, Inc. All Rights Reserved. |
| 6 | +# Written by David Howells ([email protected]) |
| 7 | +# |
| 8 | +# This program is free software; you can redistribute it and/or |
| 9 | +# modify it under the terms of the GNU General Public Licence |
| 10 | +# as published by the Free Software Foundation; either version |
| 11 | +# 2 of the Licence, or (at your option) any later version. |
| 12 | +# |
| 13 | + |
| 14 | +use strict; |
| 15 | + |
| 16 | +my @names = (); |
| 17 | +my @oids = (); |
| 18 | + |
| 19 | +if ($#ARGV != 1) { |
| 20 | + print STDERR "Format: ", $0, " <in-h-file> <out-c-file>\n"; |
| 21 | + exit(2); |
| 22 | +} |
| 23 | + |
| 24 | +# |
| 25 | +# Open the file to read from |
| 26 | +# |
| 27 | +open IN_FILE, "<$ARGV[0]" || die; |
| 28 | +while (<IN_FILE>) { |
| 29 | + chomp; |
| 30 | + if (m!\s+OID_([a-zA-z][a-zA-Z0-9_]+),\s+/[*]\s+([012][.0-9]*)\s+[*]/!) { |
| 31 | + push @names, $1; |
| 32 | + push @oids, $2; |
| 33 | + } |
| 34 | +} |
| 35 | +close IN_FILE || die; |
| 36 | + |
| 37 | +# |
| 38 | +# Open the files to write into |
| 39 | +# |
| 40 | +open C_FILE, ">$ARGV[1]" or die; |
| 41 | +print C_FILE "/*\n"; |
| 42 | +print C_FILE " * Automatically generated by ", $0, ". Do not edit\n"; |
| 43 | +print C_FILE " */\n"; |
| 44 | + |
| 45 | +# |
| 46 | +# Split the data up into separate lists and also determine the lengths of the |
| 47 | +# encoded data arrays. |
| 48 | +# |
| 49 | +my @indices = (); |
| 50 | +my @lengths = (); |
| 51 | +my $total_length = 0; |
| 52 | + |
| 53 | +print "Compiling ", $#names + 1, " OIDs\n"; |
| 54 | + |
| 55 | +for (my $i = 0; $i <= $#names; $i++) { |
| 56 | + my $name = $names[$i]; |
| 57 | + my $oid = $oids[$i]; |
| 58 | + |
| 59 | + my @components = split(/[.]/, $oid); |
| 60 | + |
| 61 | + # Determine the encoded length of this OID |
| 62 | + my $size = $#components; |
| 63 | + for (my $loop = 2; $loop <= $#components; $loop++) { |
| 64 | + my $c = $components[$loop]; |
| 65 | + |
| 66 | + # We will base128 encode the number |
| 67 | + my $tmp = ($c == 0) ? 0 : int(log($c)/log(2)); |
| 68 | + $tmp = int($tmp / 7); |
| 69 | + $size += $tmp; |
| 70 | + } |
| 71 | + push @lengths, $size; |
| 72 | + push @indices, $total_length; |
| 73 | + $total_length += $size; |
| 74 | +} |
| 75 | + |
| 76 | +# |
| 77 | +# Emit the look-up-by-OID index table |
| 78 | +# |
| 79 | +print C_FILE "\n"; |
| 80 | +if ($total_length <= 255) { |
| 81 | + print C_FILE "static const unsigned char oid_index[OID__NR + 1] = {\n"; |
| 82 | +} else { |
| 83 | + print C_FILE "static const unsigned short oid_index[OID__NR + 1] = {\n"; |
| 84 | +} |
| 85 | +for (my $i = 0; $i <= $#names; $i++) { |
| 86 | + print C_FILE "\t[OID_", $names[$i], "] = ", $indices[$i], ",\n" |
| 87 | +} |
| 88 | +print C_FILE "\t[OID__NR] = ", $total_length, "\n"; |
| 89 | +print C_FILE "};\n"; |
| 90 | + |
| 91 | +# |
| 92 | +# Encode the OIDs |
| 93 | +# |
| 94 | +my @encoded_oids = (); |
| 95 | + |
| 96 | +for (my $i = 0; $i <= $#names; $i++) { |
| 97 | + my @octets = (); |
| 98 | + |
| 99 | + my @components = split(/[.]/, $oids[$i]); |
| 100 | + |
| 101 | + push @octets, $components[0] * 40 + $components[1]; |
| 102 | + |
| 103 | + for (my $loop = 2; $loop <= $#components; $loop++) { |
| 104 | + my $c = $components[$loop]; |
| 105 | + |
| 106 | + # Base128 encode the number |
| 107 | + my $tmp = ($c == 0) ? 0 : int(log($c)/log(2)); |
| 108 | + $tmp = int($tmp / 7); |
| 109 | + |
| 110 | + for (; $tmp > 0; $tmp--) { |
| 111 | + push @octets, (($c >> $tmp * 7) & 0x7f) | 0x80; |
| 112 | + } |
| 113 | + push @octets, $c & 0x7f; |
| 114 | + } |
| 115 | + |
| 116 | + push @encoded_oids, \@octets; |
| 117 | +} |
| 118 | + |
| 119 | +# |
| 120 | +# Create a hash value for each OID |
| 121 | +# |
| 122 | +my @hash_values = (); |
| 123 | +for (my $i = 0; $i <= $#names; $i++) { |
| 124 | + my @octets = @{$encoded_oids[$i]}; |
| 125 | + |
| 126 | + my $hash = $#octets; |
| 127 | + foreach (@octets) { |
| 128 | + $hash += $_ * 33; |
| 129 | + } |
| 130 | + |
| 131 | + $hash = ($hash >> 24) ^ ($hash >> 16) ^ ($hash >> 8) ^ ($hash); |
| 132 | + |
| 133 | + push @hash_values, $hash & 0xff; |
| 134 | +} |
| 135 | + |
| 136 | +# |
| 137 | +# Emit the OID data |
| 138 | +# |
| 139 | +print C_FILE "\n"; |
| 140 | +print C_FILE "static const unsigned char oid_data[", $total_length, "] = {\n"; |
| 141 | +for (my $i = 0; $i <= $#names; $i++) { |
| 142 | + my @octets = @{$encoded_oids[$i]}; |
| 143 | + print C_FILE "\t"; |
| 144 | + print C_FILE $_, ", " foreach (@octets); |
| 145 | + print C_FILE "\t// ", $names[$i]; |
| 146 | + print C_FILE "\n"; |
| 147 | +} |
| 148 | +print C_FILE "};\n"; |
| 149 | + |
| 150 | +# |
| 151 | +# Build the search index table (ordered by length then hash then content) |
| 152 | +# |
| 153 | +my @index_table = ( 0 .. $#names ); |
| 154 | + |
| 155 | +@index_table = sort { |
| 156 | + my @octets_a = @{$encoded_oids[$a]}; |
| 157 | + my @octets_b = @{$encoded_oids[$b]}; |
| 158 | + |
| 159 | + return $hash_values[$a] <=> $hash_values[$b] |
| 160 | + if ($hash_values[$a] != $hash_values[$b]); |
| 161 | + return $#octets_a <=> $#octets_b |
| 162 | + if ($#octets_a != $#octets_b); |
| 163 | + for (my $i = $#octets_a; $i >= 0; $i--) { |
| 164 | + return $octets_a[$i] <=> $octets_b[$i] |
| 165 | + if ($octets_a[$i] != $octets_b[$i]); |
| 166 | + } |
| 167 | + return 0; |
| 168 | + |
| 169 | +} @index_table; |
| 170 | + |
| 171 | +# |
| 172 | +# Emit the search index and hash value table |
| 173 | +# |
| 174 | +print C_FILE "\n"; |
| 175 | +print C_FILE "static const struct {\n"; |
| 176 | +print C_FILE "\tunsigned char hash;\n"; |
| 177 | +if ($#names <= 255) { |
| 178 | + print C_FILE "\tenum OID oid : 8;\n"; |
| 179 | +} else { |
| 180 | + print C_FILE "\tenum OID oid : 16;\n"; |
| 181 | +} |
| 182 | +print C_FILE "} oid_search_table[OID__NR] = {\n"; |
| 183 | +for (my $i = 0; $i <= $#names; $i++) { |
| 184 | + my @octets = @{$encoded_oids[$index_table[$i]]}; |
| 185 | + printf(C_FILE "\t[%3u] = { %3u, OID_%-35s }, // ", |
| 186 | + $i, |
| 187 | + $hash_values[$index_table[$i]], |
| 188 | + $names[$index_table[$i]]); |
| 189 | + printf C_FILE "%02x", $_ foreach (@octets); |
| 190 | + print C_FILE "\n"; |
| 191 | +} |
| 192 | +print C_FILE "};\n"; |
| 193 | + |
| 194 | +# |
| 195 | +# Emit the OID debugging name table |
| 196 | +# |
| 197 | +#print C_FILE "\n"; |
| 198 | +#print C_FILE "const char *const oid_name_table[OID__NR + 1] = {\n"; |
| 199 | +# |
| 200 | +#for (my $i = 0; $i <= $#names; $i++) { |
| 201 | +# print C_FILE "\t\"", $names[$i], "\",\n" |
| 202 | +#} |
| 203 | +#print C_FILE "\t\"Unknown-OID\"\n"; |
| 204 | +#print C_FILE "};\n"; |
| 205 | + |
| 206 | +# |
| 207 | +# Polish off |
| 208 | +# |
| 209 | +close C_FILE or die; |
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