The Tcpdump Group git mirrors - tcpdump/blob - makemib

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 1990, 1996
   4 #       John Robert LoVerso. All rights reserved.
   5 # SMIv2 parsing copyright (c) 1999
   6 #       William C. Fenner.
   7 #
   8 # Redistribution and use in source and binary forms, with or without
   9 # modification, are permitted provided that the following conditions
  10 # are met:
  11 #
  12 # 1. Redistributions of source code must retain the above copyright
  13 #    notices, this list of conditions and the following disclaimer.
  14 #
  15 # 2. Redistributions in binary form must reproduce the above copyright
  16 #    notices, this list of conditions and the following disclaimer in the
  17 #    documentation and/or other materials provided with the distribution.
  18 #
  19 # THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
  20 # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  21 # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22 # IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  23 # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  24 # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  28 # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29 #
  30 # @(#) $Id: makemib,v 1.3 2001-09-17 22:16:52 fenner Exp $ (jlv)
  31
  32 #
  33 # This script will read either ASN.1-style MIB files or the ".defs" files
  34 # created by the ISODE "mosy" program on such files.
  35 #
  36 # The output of this script is the "mib.h" file used by tcpdumps' ASN.1/SNMP
  37 # decoding code.
  38 #
  39 # This script needs to be run by "gawk" (GNU awk).  "nawk" will work, but
  40 # dump will get a recursion error if you process LARGE mibs.  While it would
  41 # by farily easy to rewrite this not to use recursion (and also easy to
  42 # eliminate use of gsub and functions to use classic "awk"), you have to
  43 # order the structure declarations in defined-first order for the compiler
  44 # not to barf; too bad tsort doesn't take arguments.
  45 #
  46
  47 cat << EOF
  48 /*
  49  * This file was generated by tcpdump/makemib on `date`
  50  * You probably don't want to edit this by hand!
  51  *
  52  * struct mib somename = { desc, oid-octet, type, child-pointer, next-pointer
  53 };
  54  */
  55
  56 EOF
  57
  58 awk '
  59 BEGIN {
  60         debug=0;
  61         # for sanity, we prep the namespace with objects from RFC-1155
  62         # (we manually establish the root)
  63         oid["iso"]=1
  64         oidadd("org", "iso", 3)
  65         oidadd("dod", "org", 6)
  66         oidadd("internet", "dod", 1)
  67         oidadd("directory", "internet", 1)
  68         oidadd("mgmt", "internet", 2)
  69 #XXX    oidadd("mib", "mgmt", 1)
  70         oidadd("mib-2", "mgmt", 1)
  71         oidadd("experimental", "internet", 3)
  72         oidadd("private", "internet", 4)
  73         oidadd("enterprises", "private", 1)
  74         oidadd("ip", "mib-2", 4)
  75         oidadd("transmission", "mib-2", 10)
  76
  77         holddesc="none"
  78 }
  79
  80 #
  81 # Read mosy "*.defs" file.  mosy does all the parsing work; we just read
  82 # its simple and straightforward output.  It would not be too hard to make
  83 # tcpdump directly read mosy output, but...
  84 #
  85 # Ignore these unless the current file is called something.defs; false
  86 # positives are too common in DESCRIPTIONs.
  87
  88 NF > 1 && index($2,".")>0 && FILENAME ~ /\.defs/ {
  89         # currently ignore items of the form "{ iso.3.6.1 }"
  90         if (split($2, p, ".") == 2) {
  91                 oidadd($1, p[1], p[2])
  92         }
  93         next
  94 }
  95
  96 #
  97 # Must be a MIB file
  98 # Make it easier to parse - used to be done by sed
  99 { sub(/--\*.*\*--/, ""); sub(/--.*/, ""); gsub(/[{}]/, " & "); }
 100
 101 #
 102 # this next section is simple and naive, but does the job ok
 103 #
 104
 105 # foo OBJECT IDENTIFIER ::= { baz 17 }
 106 # or
 107 # foo OBJECT IDENTIFIER ::=
 108 # { baz 17 }
 109 $2$3$4 == "OBJECTIDENTIFIER::=" {
 110         holddesc="none"
 111         if (NF == 8)
 112                 oidadd($1, $6, $7)
 113         if (NF == 4)
 114                 holddesc=$1
 115         next
 116 }
 117 $1 == "{" && holddesc != "none" && NF == 4 {
 118         oidadd(holddesc, $2, $3)
 119         holddesc="none"
 120 }
 121 #
 122 # foo OBJECT IDENTIFIER
 123 #  ::= { bar 1 }
 124 $2$3 == "OBJECTIDENTIFIER" && $1 != "SYNTAX" && NF == 3 {
 125         holddesc=$1
 126 }
 127 #
 128 # foo
 129 # OBJECT IDENTIFIER ::= { bar 1 }
 130 # a couple of heuristics to exclude single words in e.g. long
 131 #  DESCRIPTION clauses
 132 NF == 1 && $1 ~ "[a-z][a-z]*[A-Z]" && $1 !~ /[(){}.,]/ && holddesc == "none" {
 133         holddesc=$1
 134 }
 135 $1$2$3 == "OBJECTIDENTIFIER::=" && holddesc != "none" {
 136         oidadd(holddesc, $5, $6)
 137         holddesc="none"
 138 }
 139 #
 140 # "normal" style
 141 # foo OBJECT-TYPE ...
 142 # ...
 143 #   ::= { baz 5 }
 144 $2 == "MODULE-IDENTITY" || $2 == "MODULE-COMPLIANCE" ||
 145         $2 == "OBJECT-IDENTITY" || $2 == "OBJECT-TYPE" ||
 146         $2 == "OBJECT-GROUP" ||
 147         $2 == "NOTIFICATION-TYPE" || $2 == "NOTIFICATION-GROUP" {
 148         holddesc=$1
 149 }
 150 $1 == "::=" && holddesc != "none" && NF == 5 {
 151         oidadd(holddesc, $3, $4)
 152         holddesc="none"
 153 }
 154 #
 155 # foo ::= { baz 17 }
 156 $2$3 == "::={" {
 157         oidadd($1,$4,$5)
 158         holddesc="none"
 159 }
 160
 161
 162 #
 163 # End of the road - output the data.
 164 #
 165
 166 END {
 167         print "struct obj"
 168         dump("iso")
 169         print "*mibroot = &_iso_obj;"
 170 }
 171
 172 function inn(file) {
 173         if (file == "" || file == "-")
 174                 return ""
 175         return " in " file
 176 }
 177
 178 #
 179 # add a new object to the tree
 180 #
 181 #               new OBJECT IDENTIFIER ::= { parent value }
 182 #
 183
 184 function oidadd(new, parent, value) {
 185         # Ignore 0.0
 186         if (parent == "0" && value == 0)
 187                 return
 188         if (debug)
 189                 print "/* oidadd" inn(FILENAME) ":", new, "in", parent, "as", value, "line", $0, "*/"
 190         # use safe C identifiers
 191         gsub(/[-&\/]/,"",new)
 192         gsub(/[-&\/]/,"",parent)
 193         # check if parent missing
 194         if (oid[parent] == "") {
 195                 printf "/* parse problem%s: no parent for %s.%s(%d) */\n", \
 196                         inn(FILENAME), parent, new, value
 197                 return
 198         }
 199         # check if parent.value already exists
 200         if (oid[new] > 0 && oid[new] != value) {
 201                 printf "/* parse problem%s: dup %s.%s(%d) != old (%d) */\n", \
 202                         inn(FILENAME), parent, new, value, oid[new]
 203                 return
 204         }
 205         # check for new name for parent.value
 206         if (child[parent] != "") {
 207                 for (sib = child[parent]; sib != ""; sib = sibling[sib])
 208                         if (oid[sib] == value) {
 209                                 if (new != sib)
 210                                         printf "/* parse problem%s: new name" \
 211                                                 " \"%s\"" \
 212                                                 " for %s.%s(%d) ignored */\n", \
 213                                                 inn(FILENAME), new, parent, \
 214                                                 sib, value
 215                                 return
 216                         }
 217         }
 218
 219         oid[new]=value
 220         if (child[parent] == "") {
 221                 child[parent] = new
 222         } else {
 223                 sibling[new] = child[parent]
 224                 child[parent] = new
 225         }
 226 }
 227
 228 #
 229 # old(?) routine to recurse down the tree (in postfix order for convenience)
 230 #
 231
 232 function dump(item, c, s) {
 233 #       newitem=sofar"."item"("oid[item]")"
 234 #       printf "/* %s c=%s s=%s */\n", newitem, child[item], sibling[item]
 235         c="NULL"
 236         if (child[item] != "") {
 237                 dump(child[item])
 238                 c = "&_"child[item]"_obj"
 239         }
 240         s="NULL"
 241         if (sibling[item] != "") {
 242                 dump(sibling[item])
 243                 s = "&_"sibling[item]"_obj"
 244         }
 245         printf "_%s_obj = {\n\t\"%s\", %d, 0,\n\t%s, %s\n},\n", \
 246                 item, item, oid[item], c, s
 247 }
 248 ' $@
 249 exit 0