According to the ASN.1 documents, OIDs of the form 2.100.3 are
correctly encoded as 0x0603813403. tcpdump fails to properly decode
them - it displays the value 4.20.3 instead of 2.100.3. The patch
below fixes this problem.
/js
--- print-snmp.c.~1.50.~ Tue Sep 18 00:16:53 2001
+++ print-snmp.c Mon May 6 11:24:14 2002
@@ -688,13 +688,17 @@
/*
* first subitem encodes two items with 1st*OIDMUX+2nd
+ * (see X.690:1997 clause 8.19 for the details)
*/
if (first < 0) {
+ int s;
if (!nflag)
objp = mibroot;
first = 0;
- OBJ_PRINT(o/OIDMUX, first);
- o %= OIDMUX;
+ s = o / OIDMUX;
+ if (s > 2) s = 2;
+ OBJ_PRINT(s, first);
+ o -= s * OIDMUX;
}
OBJ_PRINT(o, first);
if (--first < 0)
@@ -875,16 +879,19 @@
/*
* first subitem encodes two items with 1st*OIDMUX+2nd
+ * (see X.690:1997 clause 8.19 for the details)
*/
if (first < 0) {
first = 0;
if (*oidlen < oidsize) {
- oid[(*oidlen)++] = o/OIDMUX;
+ oid[*oidlen] = o / OIDMUX;
+ if (oid[*oidlen] > 2) oid[*oidlen] = 2;
}
- o %= OIDMUX;
+ o -= oid[*oidlen] * OIDMUX;
+ if (*oidlen < oidsize) (*oidlen)++;
}
if (*oidlen < oidsize) {
- oid[(*oidlen)++] = o;
+ oid[(*oidlen)++] = o;
}
o = 0;
}
-
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