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174 lines
4.3 KiB
Bash
Executable File
174 lines
4.3 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright (c) 1990, 1996, by John Robert LoVerso.
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms are permitted
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# provided that the above copyright notice and this paragraph are
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# duplicated in all such forms and that any documentation,
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# advertising materials, and other materials related to such
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# distribution and use acknowledge that the software was developed
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# by John Robert LoVerso.
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# THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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#
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# @(#) $Id: makemib,v 2.1 90/07/10 23:51:54 loverso Exp Locker: loverso $ (jlv
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)
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#
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# This script will read either ASN.1-style MIB files or the ".defs" files
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# created by the ISODE "mosy" program on such files.
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#
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# The output of this script is the "mib.h" file used by tcpdumps' ASN.1/SNMP
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# decoding code.
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#
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# This script needs to be run by "gawk" (GNU awk). "nawk" will work, but
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# dump will get a recursion error if you process LARGE mibs. While it would
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# by farily easy to rewrite this not to use recursion (and also easy to
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# eliminate use of gsub and functions to use classic "awk"), you have to
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# order the structure declarations in defined-first order for the compiler
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# not to barf; too bad tsort doesn't take arguments.
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#
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cat << EOF
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/*
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* This file was generated by tcpdump/makemib on `date`
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* You probably don't want to edit this by hand!
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*
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* struct mib somename = { desc, oid-octet, type, child-pointer, next-pointer
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};
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*/
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EOF
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# use sed to make the ASN.1 easier to parse
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# I should really just use a recursive descent parser in awk, but...
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sed \
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-e 's/--\*.*\*--//' \
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-e 's/--.*//' \
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-e 's/\([{}]\)/ \1 /g' \
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$@ \
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| gawk '
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BEGIN {
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# for sanity, we prep the namespace with objects from RFC-1155
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# (we manually establish the root)
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oid["iso"]=1
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oidadd("org", "iso", 3)
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oidadd("dod", "org", 6)
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oidadd("internet", "dod", 1)
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oidadd("directory", "internet", 1)
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oidadd("mgmt", "internet", 2)
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oidadd("mib", "mgmt", 1)
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oidadd("experimental", "internet", 3)
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oidadd("private", "internet", 4)
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oidadd("enterprises", "private", 1)
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holddesc="none"
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}
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#
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# Read mosy "*.defs" file. mosy does all the parsing work; we just read
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# its simple and straightforward output. It would not be too hard to make
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# tcpdump directly read mosy output, but...
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#
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NF > 1 && index($2,".")>0 {
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# currently ignore items of the form "{ iso.3.6.1 }"
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if (split($2, p, ".") == 2)
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oidadd($1, p[1], p[2])
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next
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}
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#
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# this next section is simple and naive, but does the job 100%
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#
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$2$3$4 == "OBJECTIDENTIFIER::=" {
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holddesc="none"
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if (NF == 8)
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oidadd($1, $6, $7)
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}
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$2 == "OBJECT-TYPE" {
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holddesc=$1
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}
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$1 == "::=" && holddesc != "none" && NF == 5 {
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oidadd(holddesc, $3, $4)
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holddesc="none"
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}
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#
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# End of the road - output the data.
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#
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END {
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print "struct obj"
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dump("iso")
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print "*mibroot = &_iso_obj;"
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}
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#
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# add a new object to the tree
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#
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# new OBJECT IDENTIFIER ::= { parent value }
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#
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function oidadd(new, parent, value) {
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# use safe C identifiers
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gsub(/[-&\/]/,"",new)
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gsub(/[-&\/]/,"",parent)
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# check if parent missing
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if (oid[parent] == 0) {
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printf "/* parse problem: no parent for %s.%s(%d) */\n", \
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parent, new, value
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return
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}
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# check if parent.value already exists
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if (oid[new] > 0 && oid[new] != value) {
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printf "/* parse problem: dup %s.%s(%d) != old (%d) */\n", \
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parent, new, value, oid[new]
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return
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}
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# check for new name for parent.value
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if (child[parent] != "") {
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for (sib = child[parent]; sib != ""; sib = sibling[sib])
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if (oid[sib] == value) {
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printf "/* parse problem: new name \"%s\"" \
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" for %s.%s(%d) ignored */\n", \
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new, parent, sib, value
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return
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}
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}
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oid[new]=value
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if (child[parent] == "") {
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child[parent] = new
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} else {
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sibling[new] = child[parent]
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child[parent] = new
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}
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}
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#
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# old(?) routine to recurse down the tree (in postfix order for convenience)
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#
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function dump(item, c, s) {
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# newitem=sofar"."item"("oid[item]")"
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# printf "/* %s c=%s s=%s */\n", newitem, child[item], sibling[item]
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c="NULL"
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if (child[item] != "") {
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dump(child[item])
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c = "&_"child[item]"_obj"
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}
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s="NULL"
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if (sibling[item] != "") {
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dump(sibling[item])
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s = "&_"sibling[item]"_obj"
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}
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printf "_%s_obj = {\n\t\"%s\", %d, 0,\n\t%s, %s\n},\n", \
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item, item, oid[item], c, s
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}
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'
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exit 0
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