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