David Howells | a77ad6e | 2012-09-21 23:30:46 +0100 | [diff] [blame] | 1 | #!/usr/bin/perl -w |
Thomas Gleixner | b4d0d23 | 2019-05-20 19:08:01 +0200 | [diff] [blame] | 2 | # SPDX-License-Identifier: GPL-2.0-or-later |
David Howells | a77ad6e | 2012-09-21 23:30:46 +0100 | [diff] [blame] | 3 | # |
| 4 | # Build a static ASN.1 Object Identified (OID) registry |
| 5 | # |
| 6 | # Copyright (C) 2012 Red Hat, Inc. All Rights Reserved. |
| 7 | # Written by David Howells (dhowells@redhat.com) |
| 8 | # |
David Howells | a77ad6e | 2012-09-21 23:30:46 +0100 | [diff] [blame] | 9 | |
| 10 | use strict; |
| 11 | |
| 12 | my @names = (); |
| 13 | my @oids = (); |
| 14 | |
| 15 | if ($#ARGV != 1) { |
| 16 | print STDERR "Format: ", $0, " <in-h-file> <out-c-file>\n"; |
| 17 | exit(2); |
| 18 | } |
| 19 | |
| 20 | # |
| 21 | # Open the file to read from |
| 22 | # |
| 23 | open IN_FILE, "<$ARGV[0]" || die; |
| 24 | while (<IN_FILE>) { |
| 25 | chomp; |
| 26 | if (m!\s+OID_([a-zA-z][a-zA-Z0-9_]+),\s+/[*]\s+([012][.0-9]*)\s+[*]/!) { |
| 27 | push @names, $1; |
| 28 | push @oids, $2; |
| 29 | } |
| 30 | } |
| 31 | close IN_FILE || die; |
| 32 | |
| 33 | # |
| 34 | # Open the files to write into |
| 35 | # |
| 36 | open C_FILE, ">$ARGV[1]" or die; |
| 37 | print C_FILE "/*\n"; |
| 38 | print C_FILE " * Automatically generated by ", $0, ". Do not edit\n"; |
| 39 | print C_FILE " */\n"; |
| 40 | |
| 41 | # |
| 42 | # Split the data up into separate lists and also determine the lengths of the |
| 43 | # encoded data arrays. |
| 44 | # |
| 45 | my @indices = (); |
| 46 | my @lengths = (); |
| 47 | my $total_length = 0; |
| 48 | |
David Howells | a77ad6e | 2012-09-21 23:30:46 +0100 | [diff] [blame] | 49 | for (my $i = 0; $i <= $#names; $i++) { |
| 50 | my $name = $names[$i]; |
| 51 | my $oid = $oids[$i]; |
| 52 | |
| 53 | my @components = split(/[.]/, $oid); |
| 54 | |
| 55 | # Determine the encoded length of this OID |
| 56 | my $size = $#components; |
| 57 | for (my $loop = 2; $loop <= $#components; $loop++) { |
| 58 | my $c = $components[$loop]; |
| 59 | |
| 60 | # We will base128 encode the number |
| 61 | my $tmp = ($c == 0) ? 0 : int(log($c)/log(2)); |
| 62 | $tmp = int($tmp / 7); |
| 63 | $size += $tmp; |
| 64 | } |
| 65 | push @lengths, $size; |
| 66 | push @indices, $total_length; |
| 67 | $total_length += $size; |
| 68 | } |
| 69 | |
| 70 | # |
| 71 | # Emit the look-up-by-OID index table |
| 72 | # |
| 73 | print C_FILE "\n"; |
| 74 | if ($total_length <= 255) { |
| 75 | print C_FILE "static const unsigned char oid_index[OID__NR + 1] = {\n"; |
| 76 | } else { |
| 77 | print C_FILE "static const unsigned short oid_index[OID__NR + 1] = {\n"; |
| 78 | } |
| 79 | for (my $i = 0; $i <= $#names; $i++) { |
| 80 | print C_FILE "\t[OID_", $names[$i], "] = ", $indices[$i], ",\n" |
| 81 | } |
| 82 | print C_FILE "\t[OID__NR] = ", $total_length, "\n"; |
| 83 | print C_FILE "};\n"; |
| 84 | |
| 85 | # |
| 86 | # Encode the OIDs |
| 87 | # |
| 88 | my @encoded_oids = (); |
| 89 | |
| 90 | for (my $i = 0; $i <= $#names; $i++) { |
| 91 | my @octets = (); |
| 92 | |
| 93 | my @components = split(/[.]/, $oids[$i]); |
| 94 | |
| 95 | push @octets, $components[0] * 40 + $components[1]; |
| 96 | |
| 97 | for (my $loop = 2; $loop <= $#components; $loop++) { |
| 98 | my $c = $components[$loop]; |
| 99 | |
| 100 | # Base128 encode the number |
| 101 | my $tmp = ($c == 0) ? 0 : int(log($c)/log(2)); |
| 102 | $tmp = int($tmp / 7); |
| 103 | |
| 104 | for (; $tmp > 0; $tmp--) { |
| 105 | push @octets, (($c >> $tmp * 7) & 0x7f) | 0x80; |
| 106 | } |
| 107 | push @octets, $c & 0x7f; |
| 108 | } |
| 109 | |
| 110 | push @encoded_oids, \@octets; |
| 111 | } |
| 112 | |
| 113 | # |
| 114 | # Create a hash value for each OID |
| 115 | # |
| 116 | my @hash_values = (); |
| 117 | for (my $i = 0; $i <= $#names; $i++) { |
| 118 | my @octets = @{$encoded_oids[$i]}; |
| 119 | |
| 120 | my $hash = $#octets; |
| 121 | foreach (@octets) { |
| 122 | $hash += $_ * 33; |
| 123 | } |
| 124 | |
| 125 | $hash = ($hash >> 24) ^ ($hash >> 16) ^ ($hash >> 8) ^ ($hash); |
| 126 | |
| 127 | push @hash_values, $hash & 0xff; |
| 128 | } |
| 129 | |
| 130 | # |
| 131 | # Emit the OID data |
| 132 | # |
| 133 | print C_FILE "\n"; |
| 134 | print C_FILE "static const unsigned char oid_data[", $total_length, "] = {\n"; |
| 135 | for (my $i = 0; $i <= $#names; $i++) { |
| 136 | my @octets = @{$encoded_oids[$i]}; |
| 137 | print C_FILE "\t"; |
| 138 | print C_FILE $_, ", " foreach (@octets); |
| 139 | print C_FILE "\t// ", $names[$i]; |
| 140 | print C_FILE "\n"; |
| 141 | } |
| 142 | print C_FILE "};\n"; |
| 143 | |
| 144 | # |
| 145 | # Build the search index table (ordered by length then hash then content) |
| 146 | # |
| 147 | my @index_table = ( 0 .. $#names ); |
| 148 | |
| 149 | @index_table = sort { |
| 150 | my @octets_a = @{$encoded_oids[$a]}; |
| 151 | my @octets_b = @{$encoded_oids[$b]}; |
| 152 | |
| 153 | return $hash_values[$a] <=> $hash_values[$b] |
| 154 | if ($hash_values[$a] != $hash_values[$b]); |
| 155 | return $#octets_a <=> $#octets_b |
| 156 | if ($#octets_a != $#octets_b); |
| 157 | for (my $i = $#octets_a; $i >= 0; $i--) { |
| 158 | return $octets_a[$i] <=> $octets_b[$i] |
| 159 | if ($octets_a[$i] != $octets_b[$i]); |
| 160 | } |
| 161 | return 0; |
| 162 | |
| 163 | } @index_table; |
| 164 | |
| 165 | # |
| 166 | # Emit the search index and hash value table |
| 167 | # |
| 168 | print C_FILE "\n"; |
| 169 | print C_FILE "static const struct {\n"; |
| 170 | print C_FILE "\tunsigned char hash;\n"; |
| 171 | if ($#names <= 255) { |
| 172 | print C_FILE "\tenum OID oid : 8;\n"; |
| 173 | } else { |
| 174 | print C_FILE "\tenum OID oid : 16;\n"; |
| 175 | } |
| 176 | print C_FILE "} oid_search_table[OID__NR] = {\n"; |
| 177 | for (my $i = 0; $i <= $#names; $i++) { |
| 178 | my @octets = @{$encoded_oids[$index_table[$i]]}; |
| 179 | printf(C_FILE "\t[%3u] = { %3u, OID_%-35s }, // ", |
| 180 | $i, |
| 181 | $hash_values[$index_table[$i]], |
| 182 | $names[$index_table[$i]]); |
| 183 | printf C_FILE "%02x", $_ foreach (@octets); |
| 184 | print C_FILE "\n"; |
| 185 | } |
| 186 | print C_FILE "};\n"; |
| 187 | |
| 188 | # |
| 189 | # Emit the OID debugging name table |
| 190 | # |
| 191 | #print C_FILE "\n"; |
| 192 | #print C_FILE "const char *const oid_name_table[OID__NR + 1] = {\n"; |
| 193 | # |
| 194 | #for (my $i = 0; $i <= $#names; $i++) { |
| 195 | # print C_FILE "\t\"", $names[$i], "\",\n" |
| 196 | #} |
| 197 | #print C_FILE "\t\"Unknown-OID\"\n"; |
| 198 | #print C_FILE "};\n"; |
| 199 | |
| 200 | # |
| 201 | # Polish off |
| 202 | # |
| 203 | close C_FILE or die; |