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TOMOYO Linux Cross Reference
Linux/lib/build_OID_registry

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  1 #!/usr/bin/perl -w
  2 # SPDX-License-Identifier: GPL-2.0-or-later
  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 #
  9 
 10 use strict;
 11 use Cwd qw(abs_path);
 12 
 13 my @names = ();
 14 my @oids = ();
 15 
 16 if ($#ARGV != 1) {
 17     print STDERR "Format: ", $0, " <in-h-file> <out-c-file>\n";
 18     exit(2);
 19 }
 20 
 21 my $abs_srctree = abs_path($ENV{'srctree'});
 22 
 23 #
 24 # Open the file to read from
 25 #
 26 open IN_FILE, "<$ARGV[0]" || die;
 27 while (<IN_FILE>) {
 28     chomp;
 29     if (m!\s+OID_([a-zA-z][a-zA-Z0-9_]+),\s+/[*]\s+([012][.0-9]*)\s+[*]/!) {
 30         push @names, $1;
 31         push @oids, $2;
 32     }
 33 }
 34 close IN_FILE || die;
 35 
 36 #
 37 # Open the files to write into
 38 #
 39 open C_FILE, ">$ARGV[1]" or die;
 40 print C_FILE "/*\n";
 41 my $scriptname = $0;
 42 $scriptname =~ s#^\Q$abs_srctree/\E##;
 43 print C_FILE " * Automatically generated by ", $scriptname, ".  Do not edit\n";
 44 print C_FILE " */\n";
 45 
 46 #
 47 # Split the data up into separate lists and also determine the lengths of the
 48 # encoded data arrays.
 49 #
 50 my @indices = ();
 51 my @lengths = ();
 52 my $total_length = 0;
 53 
 54 for (my $i = 0; $i <= $#names; $i++) {
 55     my $name = $names[$i];
 56     my $oid = $oids[$i];
 57 
 58     my @components = split(/[.]/, $oid);
 59 
 60     # Determine the encoded length of this OID
 61     my $size = $#components;
 62     for (my $loop = 2; $loop <= $#components; $loop++) {
 63         my $c = $components[$loop];
 64 
 65         # We will base128 encode the number
 66         my $tmp = ($c == 0) ? 0 : int(log($c)/log(2));
 67         $tmp = int($tmp / 7);
 68         $size += $tmp;
 69     }
 70     push @lengths, $size;
 71     push @indices, $total_length;
 72     $total_length += $size;
 73 }
 74 
 75 #
 76 # Emit the look-up-by-OID index table
 77 #
 78 print C_FILE "\n";
 79 if ($total_length <= 255) {
 80     print C_FILE "static const unsigned char oid_index[OID__NR + 1] = {\n";
 81 } else {
 82     print C_FILE "static const unsigned short oid_index[OID__NR + 1] = {\n";
 83 }
 84 for (my $i = 0; $i <= $#names; $i++) {
 85     print C_FILE "\t[OID_", $names[$i], "] = ", $indices[$i], ",\n"
 86 }
 87 print C_FILE "\t[OID__NR] = ", $total_length, "\n";
 88 print C_FILE "};\n";
 89 
 90 #
 91 # Encode the OIDs
 92 #
 93 my @encoded_oids = ();
 94 
 95 for (my $i = 0; $i <= $#names; $i++) {
 96     my @octets = ();
 97 
 98     my @components = split(/[.]/, $oids[$i]);
 99 
100     push @octets, $components[0] * 40 + $components[1];
101 
102     for (my $loop = 2; $loop <= $#components; $loop++) {
103         my $c = $components[$loop];
104 
105         # Base128 encode the number
106         my $tmp = ($c == 0) ? 0 : int(log($c)/log(2));
107         $tmp = int($tmp / 7);
108 
109         for (; $tmp > 0; $tmp--) {
110             push @octets, (($c >> $tmp * 7) & 0x7f) | 0x80;
111         }
112         push @octets, $c & 0x7f;
113     }
114 
115     push @encoded_oids, \@octets;
116 }
117 
118 #
119 # Create a hash value for each OID
120 #
121 my @hash_values = ();
122 for (my $i = 0; $i <= $#names; $i++) {
123     my @octets = @{$encoded_oids[$i]};
124 
125     my $hash = $#octets;
126     foreach (@octets) {
127         $hash += $_ * 33;
128     }
129 
130     $hash = ($hash >> 24) ^ ($hash >> 16) ^ ($hash >> 8) ^ ($hash);
131 
132     push @hash_values, $hash & 0xff;
133 }
134 
135 #
136 # Emit the OID data
137 #
138 print C_FILE "\n";
139 print C_FILE "static const unsigned char oid_data[", $total_length, "] = {\n";
140 for (my $i = 0; $i <= $#names; $i++) {
141     my @octets = @{$encoded_oids[$i]};
142     print C_FILE "\t";
143     print C_FILE $_, ", " foreach (@octets);
144     print C_FILE "\t// ", $names[$i];
145     print C_FILE "\n";
146 }
147 print C_FILE "};\n";
148 
149 #
150 # Build the search index table (ordered by length then hash then content)
151 #
152 my @index_table = ( 0 .. $#names );
153 
154 @index_table = sort {
155     my @octets_a = @{$encoded_oids[$a]};
156     my @octets_b = @{$encoded_oids[$b]};
157 
158     return $hash_values[$a] <=> $hash_values[$b]
159         if ($hash_values[$a] != $hash_values[$b]);
160     return $#octets_a <=> $#octets_b
161         if ($#octets_a != $#octets_b);
162     for (my $i = $#octets_a; $i >= 0; $i--) {
163         return $octets_a[$i] <=> $octets_b[$i]
164             if ($octets_a[$i] != $octets_b[$i]);
165     }
166     return 0;
167 
168 } @index_table;
169 
170 #
171 # Emit the search index and hash value table
172 #
173 print C_FILE "\n";
174 print C_FILE "static const struct {\n";
175 print C_FILE "\tunsigned char hash;\n";
176 if ($#names <= 255) {
177     print C_FILE "\tenum OID oid : 8;\n";
178 } else {
179     print C_FILE "\tenum OID oid : 16;\n";
180 }
181 print C_FILE "} oid_search_table[OID__NR] = {\n";
182 for (my $i = 0; $i <= $#names; $i++) {
183     my @octets = @{$encoded_oids[$index_table[$i]]};
184     printf(C_FILE "\t[%3u] = { %3u, OID_%-35s }, // ",
185            $i,
186            $hash_values[$index_table[$i]],
187            $names[$index_table[$i]]);
188     printf C_FILE "%02x", $_ foreach (@octets);
189     print C_FILE "\n";
190 }
191 print C_FILE "};\n";
192 
193 #
194 # Emit the OID debugging name table
195 #
196 #print C_FILE "\n";
197 #print C_FILE "const char *const oid_name_table[OID__NR + 1] = {\n";
198 #
199 #for (my $i = 0; $i <= $#names; $i++) {
200 #    print C_FILE "\t\"", $names[$i], "\",\n"
201 #}
202 #print C_FILE "\t\"Unknown-OID\"\n";
203 #print C_FILE "};\n";
204 
205 #
206 # Polish off
207 #
208 close C_FILE or die;

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