1051 lines
22 KiB
C
1051 lines
22 KiB
C
/* $NetBSD: print-snmp.c,v 1.4 1997/10/03 19:55:43 christos Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
|
|
* The Regents of the University of California. 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.
|
|
*
|
|
* This implementation has been influenced by the CMU SNMP release,
|
|
* by Steve Waldbusser. However, this shares no code with that system.
|
|
* Additional ASN.1 insight gained from Marshall T. Rose's _The_Open_Book_.
|
|
* Earlier forms of this implementation were derived and/or inspired by an
|
|
* awk script originally written by C. Philip Wood of LANL (but later
|
|
* heavily modified by John Robert LoVerso). The copyright notice for
|
|
* that work is preserved below, even though it may not rightly apply
|
|
* to this file.
|
|
*
|
|
* This started out as a very simple program, but the incremental decoding
|
|
* (into the BE structure) complicated things.
|
|
*
|
|
# Los Alamos National Laboratory
|
|
#
|
|
# Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
|
|
# This software was produced under a U.S. Government contract
|
|
# (W-7405-ENG-36) by Los Alamos National Laboratory, which is
|
|
# operated by the University of California for the U.S. Department
|
|
# of Energy. The U.S. Government is licensed to use, reproduce,
|
|
# and distribute this software. Permission is granted to the
|
|
# public to copy and use this software without charge, provided
|
|
# that this Notice and any statement of authorship are reproduced
|
|
# on all copies. Neither the Government nor the University makes
|
|
# any warranty, express or implied, or assumes any liability or
|
|
# responsibility for the use of this software.
|
|
# @(#)snmp.awk.x 1.1 (LANL) 1/15/90
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#ifndef lint
|
|
#if 0
|
|
static const char rcsid[] =
|
|
"@(#) Header: print-snmp.c,v 1.33 97/06/15 13:20:28 leres Exp (LBL)";
|
|
#else
|
|
__RCSID("$NetBSD: print-snmp.c,v 1.4 1997/10/03 19:55:43 christos Exp $");
|
|
#endif
|
|
#endif
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/time.h>
|
|
|
|
#include <ctype.h>
|
|
#ifdef HAVE_MEMORY_H
|
|
#include <memory.h>
|
|
#endif
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include "interface.h"
|
|
#include "addrtoname.h"
|
|
|
|
/*
|
|
* Universal ASN.1 types
|
|
* (we only care about the tag values for those allowed in the Internet SMI)
|
|
*/
|
|
char *Universal[] = {
|
|
"U-0",
|
|
"Boolean",
|
|
"Integer",
|
|
#define INTEGER 2
|
|
"Bitstring",
|
|
"String",
|
|
#define STRING 4
|
|
"Null",
|
|
#define ASN_NULL 5
|
|
"ObjID",
|
|
#define OBJECTID 6
|
|
"ObjectDes",
|
|
"U-8","U-9","U-10","U-11", /* 8-11 */
|
|
"U-12","U-13","U-14","U-15", /* 12-15 */
|
|
"Sequence",
|
|
#define SEQUENCE 16
|
|
"Set"
|
|
};
|
|
|
|
/*
|
|
* Application-wide ASN.1 types from the Internet SMI and their tags
|
|
*/
|
|
char *Application[] = {
|
|
"IpAddress",
|
|
#define IPADDR 0
|
|
"Counter",
|
|
#define COUNTER 1
|
|
"Gauge",
|
|
#define GAUGE 2
|
|
"TimeTicks",
|
|
#define TIMETICKS 3
|
|
"Opaque"
|
|
};
|
|
|
|
/*
|
|
* Context-specific ASN.1 types for the SNMP PDUs and their tags
|
|
*/
|
|
char *Context[] = {
|
|
"GetRequest",
|
|
#define GETREQ 0
|
|
"GetNextRequest",
|
|
#define GETNEXTREQ 1
|
|
"GetResponse",
|
|
#define GETRESP 2
|
|
"SetRequest",
|
|
#define SETREQ 3
|
|
"Trap"
|
|
#define TRAP 4
|
|
};
|
|
|
|
/*
|
|
* Private ASN.1 types
|
|
* The Internet SMI does not specify any
|
|
*/
|
|
char *Private[] = {
|
|
"P-0"
|
|
};
|
|
|
|
/*
|
|
* error-status values for any SNMP PDU
|
|
*/
|
|
char *ErrorStatus[] = {
|
|
"noError",
|
|
"tooBig",
|
|
"noSuchName",
|
|
"badValue",
|
|
"readOnly",
|
|
"genErr"
|
|
};
|
|
#define DECODE_ErrorStatus(e) \
|
|
( e >= 0 && e <= sizeof(ErrorStatus)/sizeof(ErrorStatus[0]) \
|
|
? ErrorStatus[e] : (sprintf(errbuf, "err=%u", e), errbuf))
|
|
|
|
/*
|
|
* generic-trap values in the SNMP Trap-PDU
|
|
*/
|
|
char *GenericTrap[] = {
|
|
"coldStart",
|
|
"warmStart",
|
|
"linkDown",
|
|
"linkUp",
|
|
"authenticationFailure",
|
|
"egpNeighborLoss",
|
|
"enterpriseSpecific"
|
|
#define GT_ENTERPRISE 7
|
|
};
|
|
#define DECODE_GenericTrap(t) \
|
|
( t >= 0 && t <= sizeof(GenericTrap)/sizeof(GenericTrap[0]) \
|
|
? GenericTrap[t] : (sprintf(buf, "gt=%d", t), buf))
|
|
|
|
/*
|
|
* ASN.1 type class table
|
|
* Ties together the preceding Universal, Application, Context, and Private
|
|
* type definitions.
|
|
*/
|
|
#define defineCLASS(x) { "x", x, sizeof(x)/sizeof(x[0]) } /* not ANSI-C */
|
|
struct {
|
|
char *name;
|
|
char **Id;
|
|
int numIDs;
|
|
} Class[] = {
|
|
defineCLASS(Universal),
|
|
#define UNIVERSAL 0
|
|
defineCLASS(Application),
|
|
#define APPLICATION 1
|
|
defineCLASS(Context),
|
|
#define CONTEXT 2
|
|
defineCLASS(Private),
|
|
#define PRIVATE 3
|
|
};
|
|
|
|
/*
|
|
* defined forms for ASN.1 types
|
|
*/
|
|
char *Form[] = {
|
|
"Primitive",
|
|
#define PRIMITIVE 0
|
|
"Constructed",
|
|
#define CONSTRUCTED 1
|
|
};
|
|
|
|
/*
|
|
* A structure for the OID tree for the compiled-in MIB.
|
|
* This is stored as a general-order tree.
|
|
*/
|
|
struct obj {
|
|
char *desc; /* name of object */
|
|
u_char oid; /* sub-id following parent */
|
|
u_char type; /* object type (unused) */
|
|
struct obj *child, *next; /* child and next sibling pointers */
|
|
} *objp = NULL;
|
|
|
|
/*
|
|
* Include the compiled in SNMP MIB. "mib.h" is produced by feeding
|
|
* RFC-1156 format files into "makemib". "mib.h" MUST define at least
|
|
* a value for `mibroot'.
|
|
*
|
|
* In particular, this is gross, as this is including initialized structures,
|
|
* and by right shouldn't be an "include" file.
|
|
*/
|
|
#include "mib.h"
|
|
|
|
/*
|
|
* This defines a list of OIDs which will be abbreviated on output.
|
|
* Currently, this includes the prefixes for the Internet MIB, the
|
|
* private enterprises tree, and the experimental tree.
|
|
*/
|
|
struct obj_abrev {
|
|
char *prefix; /* prefix for this abrev */
|
|
struct obj *node; /* pointer into object table */
|
|
char *oid; /* ASN.1 encoded OID */
|
|
} obj_abrev_list[] = {
|
|
#ifndef NO_ABREV_MIB
|
|
/* .iso.org.dod.internet.mgmt.mib */
|
|
{ "", &_mib_obj, "\53\6\1\2\1" },
|
|
#endif
|
|
#ifndef NO_ABREV_ENTER
|
|
/* .iso.org.dod.internet.private.enterprises */
|
|
{ "E:", &_enterprises_obj, "\53\6\1\4\1" },
|
|
#endif
|
|
#ifndef NO_ABREV_EXPERI
|
|
/* .iso.org.dod.internet.experimental */
|
|
{ "X:", &_experimental_obj, "\53\6\1\3" },
|
|
#endif
|
|
{ 0,0,0 }
|
|
};
|
|
|
|
/*
|
|
* This is used in the OID print routine to walk down the object tree
|
|
* rooted at `mibroot'.
|
|
*/
|
|
#define OBJ_PRINT(o, suppressdot) \
|
|
{ \
|
|
if (objp) { \
|
|
do { \
|
|
if ((o) == objp->oid) \
|
|
break; \
|
|
} while ((objp = objp->next) != NULL); \
|
|
} \
|
|
if (objp) { \
|
|
printf(suppressdot?"%s":".%s", objp->desc); \
|
|
objp = objp->child; \
|
|
} else \
|
|
printf(suppressdot?"%u":".%u", (o)); \
|
|
}
|
|
|
|
/*
|
|
* This is the definition for the Any-Data-Type storage used purely for
|
|
* temporary internal representation while decoding an ASN.1 data stream.
|
|
*/
|
|
struct be {
|
|
u_int32_t asnlen;
|
|
union {
|
|
caddr_t raw;
|
|
int32_t integer;
|
|
u_int32_t uns;
|
|
const u_char *str;
|
|
} data;
|
|
u_short id;
|
|
u_char form, class; /* tag info */
|
|
u_char type;
|
|
#define BE_ANY 255
|
|
#define BE_NONE 0
|
|
#define BE_NULL 1
|
|
#define BE_OCTET 2
|
|
#define BE_OID 3
|
|
#define BE_INT 4
|
|
#define BE_UNS 5
|
|
#define BE_STR 6
|
|
#define BE_SEQ 7
|
|
#define BE_INETADDR 8
|
|
#define BE_PDU 9
|
|
};
|
|
|
|
/*
|
|
* Defaults for SNMP PDU components
|
|
*/
|
|
#define DEF_COMMUNITY "public"
|
|
#define DEF_VERSION 0
|
|
|
|
/*
|
|
* constants for ASN.1 decoding
|
|
*/
|
|
#define OIDMUX 40
|
|
#define ASNLEN_INETADDR 4
|
|
#define ASN_SHIFT7 7
|
|
#define ASN_SHIFT8 8
|
|
#define ASN_BIT8 0x80
|
|
#define ASN_LONGLEN 0x80
|
|
|
|
#define ASN_ID_BITS 0x1f
|
|
#define ASN_FORM_BITS 0x20
|
|
#define ASN_FORM_SHIFT 5
|
|
#define ASN_CLASS_BITS 0xc0
|
|
#define ASN_CLASS_SHIFT 6
|
|
|
|
#define ASN_ID_EXT 0x1f /* extension ID in tag field */
|
|
|
|
/*
|
|
* truncated==1 means the packet was complete, but we don't have all of
|
|
* it to decode.
|
|
*/
|
|
static int truncated;
|
|
#define ifNotTruncated if (truncated) fputs("[|snmp]", stdout); else
|
|
|
|
/*
|
|
* This decodes the next ASN.1 object in the stream pointed to by "p"
|
|
* (and of real-length "len") and stores the intermediate data in the
|
|
* provided BE object.
|
|
*
|
|
* This returns -l if it fails (i.e., the ASN.1 stream is not valid).
|
|
* O/w, this returns the number of bytes parsed from "p".
|
|
*/
|
|
static int
|
|
asn1_parse(register const u_char *p, u_int len, struct be *elem)
|
|
{
|
|
u_char form, class, id;
|
|
int i, hdr;
|
|
|
|
elem->asnlen = 0;
|
|
elem->type = BE_ANY;
|
|
if (len < 1) {
|
|
ifNotTruncated puts("[nothing to parse], stdout");
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* it would be nice to use a bit field, but you can't depend on them.
|
|
* +---+---+---+---+---+---+---+---+
|
|
* + class |frm| id |
|
|
* +---+---+---+---+---+---+---+---+
|
|
* 7 6 5 4 3 2 1 0
|
|
*/
|
|
id = *p & ASN_ID_BITS; /* lower 5 bits, range 00-1f */
|
|
#ifdef notdef
|
|
form = (*p & 0xe0) >> 5; /* move upper 3 bits to lower 3 */
|
|
class = form >> 1; /* bits 7&6 -> bits 1&0, range 0-3 */
|
|
form &= 0x1; /* bit 5 -> bit 0, range 0-1 */
|
|
#else
|
|
form = (u_char)(*p & ASN_FORM_BITS) >> ASN_FORM_SHIFT;
|
|
class = (u_char)(*p & ASN_CLASS_BITS) >> ASN_CLASS_SHIFT;
|
|
#endif
|
|
elem->form = form;
|
|
elem->class = class;
|
|
elem->id = id;
|
|
if (vflag)
|
|
printf("|%.2x", *p);
|
|
p++; len--; hdr = 1;
|
|
/* extended tag field */
|
|
if (id == ASN_ID_EXT) {
|
|
for (id = 0; *p & ASN_BIT8 && len > 0; len--, hdr++, p++) {
|
|
if (vflag)
|
|
printf("|%.2x", *p);
|
|
id = (id << 7) | (*p & ~ASN_BIT8);
|
|
}
|
|
if (len == 0 && *p & ASN_BIT8) {
|
|
ifNotTruncated fputs("[Xtagfield?]", stdout);
|
|
return -1;
|
|
}
|
|
elem->id = id = (id << 7) | *p;
|
|
--len;
|
|
++hdr;
|
|
++p;
|
|
}
|
|
if (len < 1) {
|
|
ifNotTruncated fputs("[no asnlen]", stdout);
|
|
return -1;
|
|
}
|
|
elem->asnlen = *p;
|
|
if (vflag)
|
|
printf("|%.2x", *p);
|
|
p++; len--; hdr++;
|
|
if (elem->asnlen & ASN_BIT8) {
|
|
int noct = elem->asnlen % ASN_BIT8;
|
|
elem->asnlen = 0;
|
|
if (len < noct) {
|
|
ifNotTruncated printf("[asnlen? %d<%d]", len, noct);
|
|
return -1;
|
|
}
|
|
for (; noct-- > 0; len--, hdr++) {
|
|
if (vflag)
|
|
printf("|%.2x", *p);
|
|
elem->asnlen = (elem->asnlen << ASN_SHIFT8) | *p++;
|
|
}
|
|
}
|
|
if (len < elem->asnlen) {
|
|
if (!truncated) {
|
|
printf("[len%d<asnlen%u]", len, elem->asnlen);
|
|
return -1;
|
|
}
|
|
/* maybe should check at least 4? */
|
|
elem->asnlen = len;
|
|
}
|
|
if (form >= sizeof(Form)/sizeof(Form[0])) {
|
|
ifNotTruncated printf("[form?%d]", form);
|
|
return -1;
|
|
}
|
|
if (class >= sizeof(Class)/sizeof(Class[0])) {
|
|
ifNotTruncated printf("[class?%c/%d]", *Form[form], class);
|
|
return -1;
|
|
}
|
|
if ((int)id >= Class[class].numIDs) {
|
|
ifNotTruncated printf("[id?%c/%s/%d]", *Form[form],
|
|
Class[class].name, id);
|
|
return -1;
|
|
}
|
|
|
|
switch (form) {
|
|
case PRIMITIVE:
|
|
switch (class) {
|
|
case UNIVERSAL:
|
|
switch (id) {
|
|
case STRING:
|
|
elem->type = BE_STR;
|
|
elem->data.str = p;
|
|
break;
|
|
|
|
case INTEGER: {
|
|
register int32_t data;
|
|
elem->type = BE_INT;
|
|
data = 0;
|
|
|
|
if (*p & ASN_BIT8) /* negative */
|
|
data = -1;
|
|
for (i = elem->asnlen; i-- > 0; p++)
|
|
data = (data << ASN_SHIFT8) | *p;
|
|
elem->data.integer = data;
|
|
break;
|
|
}
|
|
|
|
case OBJECTID:
|
|
elem->type = BE_OID;
|
|
elem->data.raw = (caddr_t)p;
|
|
break;
|
|
|
|
case ASN_NULL:
|
|
elem->type = BE_NULL;
|
|
elem->data.raw = NULL;
|
|
break;
|
|
|
|
default:
|
|
elem->type = BE_OCTET;
|
|
elem->data.raw = (caddr_t)p;
|
|
printf("[P/U/%s]",
|
|
Class[class].Id[id]);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case APPLICATION:
|
|
switch (id) {
|
|
case IPADDR:
|
|
elem->type = BE_INETADDR;
|
|
elem->data.raw = (caddr_t)p;
|
|
break;
|
|
|
|
case COUNTER:
|
|
case GAUGE:
|
|
case TIMETICKS: {
|
|
register u_int32_t data;
|
|
elem->type = BE_UNS;
|
|
data = 0;
|
|
for (i = elem->asnlen; i-- > 0; p++)
|
|
data = (data << 8) + *p;
|
|
elem->data.uns = data;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
elem->type = BE_OCTET;
|
|
elem->data.raw = (caddr_t)p;
|
|
printf("[P/A/%s]",
|
|
Class[class].Id[id]);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
elem->type = BE_OCTET;
|
|
elem->data.raw = (caddr_t)p;
|
|
printf("[P/%s/%s]",
|
|
Class[class].name, Class[class].Id[id]);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case CONSTRUCTED:
|
|
switch (class) {
|
|
case UNIVERSAL:
|
|
switch (id) {
|
|
case SEQUENCE:
|
|
elem->type = BE_SEQ;
|
|
elem->data.raw = (caddr_t)p;
|
|
break;
|
|
|
|
default:
|
|
elem->type = BE_OCTET;
|
|
elem->data.raw = (caddr_t)p;
|
|
printf("C/U/%s", Class[class].Id[id]);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case CONTEXT:
|
|
elem->type = BE_PDU;
|
|
elem->data.raw = (caddr_t)p;
|
|
break;
|
|
|
|
default:
|
|
elem->type = BE_OCTET;
|
|
elem->data.raw = (caddr_t)p;
|
|
printf("C/%s/%s",
|
|
Class[class].name, Class[class].Id[id]);
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
p += elem->asnlen;
|
|
len -= elem->asnlen;
|
|
return elem->asnlen + hdr;
|
|
}
|
|
|
|
/*
|
|
* Display the ASN.1 object represented by the BE object.
|
|
* This used to be an integral part of asn1_parse() before the intermediate
|
|
* BE form was added.
|
|
*/
|
|
static void
|
|
asn1_print(struct be *elem)
|
|
{
|
|
u_char *p = (u_char *)elem->data.raw;
|
|
u_int32_t asnlen = elem->asnlen;
|
|
int i;
|
|
|
|
switch (elem->type) {
|
|
|
|
case BE_OCTET:
|
|
for (i = asnlen; i-- > 0; p++);
|
|
printf("_%.2x", *p);
|
|
break;
|
|
|
|
case BE_NULL:
|
|
break;
|
|
|
|
case BE_OID: {
|
|
int o = 0, first = -1, i = asnlen;
|
|
|
|
if (!nflag && asnlen > 2) {
|
|
struct obj_abrev *a = &obj_abrev_list[0];
|
|
for (; a->node; a++) {
|
|
if (!memcmp(a->oid, (char *)p,
|
|
strlen(a->oid))) {
|
|
objp = a->node->child;
|
|
i -= strlen(a->oid);
|
|
p += strlen(a->oid);
|
|
fputs(a->prefix, stdout);
|
|
first = 1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
for (; i-- > 0; p++) {
|
|
o = (o << ASN_SHIFT7) + (*p & ~ASN_BIT8);
|
|
if (*p & ASN_LONGLEN)
|
|
continue;
|
|
|
|
/*
|
|
* first subitem encodes two items with 1st*OIDMUX+2nd
|
|
*/
|
|
if (first < 0) {
|
|
if (!nflag)
|
|
objp = mibroot;
|
|
first = 0;
|
|
OBJ_PRINT(o/OIDMUX, first);
|
|
o %= OIDMUX;
|
|
}
|
|
OBJ_PRINT(o, first);
|
|
if (--first < 0)
|
|
first = 0;
|
|
o = 0;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case BE_INT:
|
|
printf("%d", elem->data.integer);
|
|
break;
|
|
|
|
case BE_UNS:
|
|
printf("%d", elem->data.uns);
|
|
break;
|
|
|
|
case BE_STR: {
|
|
register int printable = 1, first = 1;
|
|
const u_char *p = elem->data.str;
|
|
for (i = asnlen; printable && i-- > 0; p++)
|
|
printable = isprint(*p) || isspace(*p);
|
|
p = elem->data.str;
|
|
if (printable) {
|
|
putchar('"');
|
|
(void)fn_print(p, p + asnlen);
|
|
putchar('"');
|
|
} else
|
|
for (i = asnlen; i-- > 0; p++) {
|
|
printf(first ? "%.2x" : "_%.2x", *p);
|
|
first = 0;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case BE_SEQ:
|
|
printf("Seq(%u)", elem->asnlen);
|
|
break;
|
|
|
|
case BE_INETADDR: {
|
|
char sep;
|
|
if (asnlen != ASNLEN_INETADDR)
|
|
printf("[inetaddr len!=%d]", ASNLEN_INETADDR);
|
|
sep='[';
|
|
for (i = asnlen; i-- > 0; p++) {
|
|
printf("%c%u", sep, *p);
|
|
sep='.';
|
|
}
|
|
putchar(']');
|
|
break;
|
|
}
|
|
|
|
case BE_PDU:
|
|
printf("%s(%u)",
|
|
Class[CONTEXT].Id[elem->id], elem->asnlen);
|
|
break;
|
|
|
|
case BE_ANY:
|
|
fputs("[BE_ANY!?]", stdout);
|
|
break;
|
|
|
|
default:
|
|
fputs("[be!?]", stdout);
|
|
break;
|
|
}
|
|
}
|
|
|
|
#ifdef notdef
|
|
/*
|
|
* This is a brute force ASN.1 printer: recurses to dump an entire structure.
|
|
* This will work for any ASN.1 stream, not just an SNMP PDU.
|
|
*
|
|
* By adding newlines and spaces at the correct places, this would print in
|
|
* Rose-Normal-Form.
|
|
*
|
|
* This is not currently used.
|
|
*/
|
|
static void
|
|
asn1_decode(u_char *p, u_int length)
|
|
{
|
|
struct be elem;
|
|
int i = 0;
|
|
|
|
while (i >= 0 && length > 0) {
|
|
i = asn1_parse(p, length, &elem);
|
|
if (i >= 0) {
|
|
fputs(" ", stdout);
|
|
asn1_print(&elem);
|
|
if (elem.type == BE_SEQ || elem.type == BE_PDU) {
|
|
fputs(" {", stdout);
|
|
asn1_decode(elem.data.raw, elem.asnlen);
|
|
fputs(" }", stdout);
|
|
}
|
|
length -= i;
|
|
p += i;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* General SNMP header
|
|
* SEQUENCE {
|
|
* version INTEGER {version-1(0)},
|
|
* community OCTET STRING,
|
|
* data ANY -- PDUs
|
|
* }
|
|
* PDUs for all but Trap: (see rfc1157 from page 15 on)
|
|
* SEQUENCE {
|
|
* request-id INTEGER,
|
|
* error-status INTEGER,
|
|
* error-index INTEGER,
|
|
* varbindlist SEQUENCE OF
|
|
* SEQUENCE {
|
|
* name ObjectName,
|
|
* value ObjectValue
|
|
* }
|
|
* }
|
|
* PDU for Trap:
|
|
* SEQUENCE {
|
|
* enterprise OBJECT IDENTIFIER,
|
|
* agent-addr NetworkAddress,
|
|
* generic-trap INTEGER,
|
|
* specific-trap INTEGER,
|
|
* time-stamp TimeTicks,
|
|
* varbindlist SEQUENCE OF
|
|
* SEQUENCE {
|
|
* name ObjectName,
|
|
* value ObjectValue
|
|
* }
|
|
* }
|
|
*/
|
|
|
|
/*
|
|
* Decode SNMP varBind
|
|
*/
|
|
static void
|
|
varbind_print(u_char pduid, const u_char *np, u_int length, int error)
|
|
{
|
|
struct be elem;
|
|
int count = 0, ind;
|
|
|
|
/* Sequence of varBind */
|
|
if ((count = asn1_parse(np, length, &elem)) < 0)
|
|
return;
|
|
if (elem.type != BE_SEQ) {
|
|
fputs("[!SEQ of varbind]", stdout);
|
|
asn1_print(&elem);
|
|
return;
|
|
}
|
|
if (count < length)
|
|
printf("[%d extra after SEQ of varbind]", length - count);
|
|
/* descend */
|
|
length = elem.asnlen;
|
|
np = (u_char *)elem.data.raw;
|
|
|
|
for (ind = 1; length > 0; ind++) {
|
|
const u_char *vbend;
|
|
u_int vblength;
|
|
|
|
if (!error || ind == error)
|
|
fputs(" ", stdout);
|
|
|
|
/* Sequence */
|
|
if ((count = asn1_parse(np, length, &elem)) < 0)
|
|
return;
|
|
if (elem.type != BE_SEQ) {
|
|
fputs("[!varbind]", stdout);
|
|
asn1_print(&elem);
|
|
return;
|
|
}
|
|
vbend = np + count;
|
|
vblength = length - count;
|
|
/* descend */
|
|
length = elem.asnlen;
|
|
np = (u_char *)elem.data.raw;
|
|
|
|
/* objName (OID) */
|
|
if ((count = asn1_parse(np, length, &elem)) < 0)
|
|
return;
|
|
if (elem.type != BE_OID) {
|
|
fputs("[objName!=OID]", stdout);
|
|
asn1_print(&elem);
|
|
return;
|
|
}
|
|
if (!error || ind == error)
|
|
asn1_print(&elem);
|
|
length -= count;
|
|
np += count;
|
|
|
|
if (pduid != GETREQ && pduid != GETNEXTREQ && !error)
|
|
fputs("=", stdout);
|
|
|
|
/* objVal (ANY) */
|
|
if ((count = asn1_parse(np, length, &elem)) < 0)
|
|
return;
|
|
if (pduid == GETREQ || pduid == GETNEXTREQ) {
|
|
if (elem.type != BE_NULL) {
|
|
fputs("[objVal!=NULL]", stdout);
|
|
asn1_print(&elem);
|
|
}
|
|
} else
|
|
if (error && ind == error && elem.type != BE_NULL)
|
|
fputs("[err objVal!=NULL]", stdout);
|
|
if (!error || ind == error)
|
|
asn1_print(&elem);
|
|
|
|
length = vblength;
|
|
np = vbend;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Decode SNMP PDUs: GetRequest, GetNextRequest, GetResponse, and SetRequest
|
|
*/
|
|
static void
|
|
snmppdu_print(u_char pduid, const u_char *np, u_int length)
|
|
{
|
|
struct be elem;
|
|
int count = 0, error;
|
|
|
|
/* reqId (Integer) */
|
|
if ((count = asn1_parse(np, length, &elem)) < 0)
|
|
return;
|
|
if (elem.type != BE_INT) {
|
|
fputs("[reqId!=INT]", stdout);
|
|
asn1_print(&elem);
|
|
return;
|
|
}
|
|
/* ignore the reqId */
|
|
length -= count;
|
|
np += count;
|
|
|
|
/* errorStatus (Integer) */
|
|
if ((count = asn1_parse(np, length, &elem)) < 0)
|
|
return;
|
|
if (elem.type != BE_INT) {
|
|
fputs("[errorStatus!=INT]", stdout);
|
|
asn1_print(&elem);
|
|
return;
|
|
}
|
|
error = 0;
|
|
if ((pduid == GETREQ || pduid == GETNEXTREQ)
|
|
&& elem.data.integer != 0) {
|
|
char errbuf[10];
|
|
printf("[errorStatus(%s)!=0]",
|
|
DECODE_ErrorStatus(elem.data.integer));
|
|
} else if (elem.data.integer != 0) {
|
|
char errbuf[10];
|
|
printf(" %s", DECODE_ErrorStatus(elem.data.integer));
|
|
error = elem.data.integer;
|
|
}
|
|
length -= count;
|
|
np += count;
|
|
|
|
/* errorIndex (Integer) */
|
|
if ((count = asn1_parse(np, length, &elem)) < 0)
|
|
return;
|
|
if (elem.type != BE_INT) {
|
|
fputs("[errorIndex!=INT]", stdout);
|
|
asn1_print(&elem);
|
|
return;
|
|
}
|
|
if ((pduid == GETREQ || pduid == GETNEXTREQ)
|
|
&& elem.data.integer != 0)
|
|
printf("[errorIndex(%d)!=0]", elem.data.integer);
|
|
else if (elem.data.integer != 0) {
|
|
if (!error)
|
|
printf("[errorIndex(%d) w/o errorStatus]",
|
|
elem.data.integer);
|
|
else {
|
|
printf("@%d", elem.data.integer);
|
|
error = elem.data.integer;
|
|
}
|
|
} else if (error) {
|
|
fputs("[errorIndex==0]", stdout);
|
|
error = 0;
|
|
}
|
|
length -= count;
|
|
np += count;
|
|
|
|
varbind_print(pduid, np, length, error);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Decode SNMP Trap PDU
|
|
*/
|
|
static void
|
|
trap_print(const u_char *np, u_int length)
|
|
{
|
|
struct be elem;
|
|
int count = 0, generic;
|
|
|
|
putchar(' ');
|
|
|
|
/* enterprise (oid) */
|
|
if ((count = asn1_parse(np, length, &elem)) < 0)
|
|
return;
|
|
if (elem.type != BE_OID) {
|
|
fputs("[enterprise!=OID]", stdout);
|
|
asn1_print(&elem);
|
|
return;
|
|
}
|
|
asn1_print(&elem);
|
|
length -= count;
|
|
np += count;
|
|
|
|
putchar(' ');
|
|
|
|
/* agent-addr (inetaddr) */
|
|
if ((count = asn1_parse(np, length, &elem)) < 0)
|
|
return;
|
|
if (elem.type != BE_INETADDR) {
|
|
fputs("[agent-addr!=INETADDR]", stdout);
|
|
asn1_print(&elem);
|
|
return;
|
|
}
|
|
asn1_print(&elem);
|
|
length -= count;
|
|
np += count;
|
|
|
|
/* generic-trap (Integer) */
|
|
if ((count = asn1_parse(np, length, &elem)) < 0)
|
|
return;
|
|
if (elem.type != BE_INT) {
|
|
fputs("[generic-trap!=INT]", stdout);
|
|
asn1_print(&elem);
|
|
return;
|
|
}
|
|
generic = elem.data.integer;
|
|
{
|
|
char buf[10];
|
|
printf(" %s", DECODE_GenericTrap(generic));
|
|
}
|
|
length -= count;
|
|
np += count;
|
|
|
|
/* specific-trap (Integer) */
|
|
if ((count = asn1_parse(np, length, &elem)) < 0)
|
|
return;
|
|
if (elem.type != BE_INT) {
|
|
fputs("[specific-trap!=INT]", stdout);
|
|
asn1_print(&elem);
|
|
return;
|
|
}
|
|
if (generic != GT_ENTERPRISE) {
|
|
if (elem.data.integer != 0)
|
|
printf("[specific-trap(%d)!=0]", elem.data.integer);
|
|
} else
|
|
printf(" s=%d", elem.data.integer);
|
|
length -= count;
|
|
np += count;
|
|
|
|
putchar(' ');
|
|
|
|
/* time-stamp (TimeTicks) */
|
|
if ((count = asn1_parse(np, length, &elem)) < 0)
|
|
return;
|
|
if (elem.type != BE_UNS) { /* XXX */
|
|
fputs("[time-stamp!=TIMETICKS]", stdout);
|
|
asn1_print(&elem);
|
|
return;
|
|
}
|
|
asn1_print(&elem);
|
|
length -= count;
|
|
np += count;
|
|
|
|
varbind_print (TRAP, np, length, 0);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Decode SNMP header and pass on to PDU printing routines
|
|
*/
|
|
void
|
|
snmp_print(const u_char *np, u_int length)
|
|
{
|
|
struct be elem, pdu;
|
|
int count = 0;
|
|
|
|
truncated = 0;
|
|
|
|
/* truncated packet? */
|
|
if (np + length > snapend) {
|
|
truncated = 1;
|
|
length = snapend - np;
|
|
}
|
|
|
|
putchar(' ');
|
|
|
|
/* initial Sequence */
|
|
if ((count = asn1_parse(np, length, &elem)) < 0)
|
|
return;
|
|
if (elem.type != BE_SEQ) {
|
|
fputs("[!init SEQ]", stdout);
|
|
asn1_print(&elem);
|
|
return;
|
|
}
|
|
if (count < length)
|
|
printf("[%d extra after iSEQ]", length - count);
|
|
/* descend */
|
|
length = elem.asnlen;
|
|
np = (u_char *)elem.data.raw;
|
|
/* Version (Integer) */
|
|
if ((count = asn1_parse(np, length, &elem)) < 0)
|
|
return;
|
|
if (elem.type != BE_INT) {
|
|
fputs("[version!=INT]", stdout);
|
|
asn1_print(&elem);
|
|
return;
|
|
}
|
|
/* only handle version==0 */
|
|
if (elem.data.integer != DEF_VERSION) {
|
|
printf("[version(%d)!=0]", elem.data.integer);
|
|
return;
|
|
}
|
|
length -= count;
|
|
np += count;
|
|
|
|
/* Community (String) */
|
|
if ((count = asn1_parse(np, length, &elem)) < 0)
|
|
return;
|
|
if (elem.type != BE_STR) {
|
|
fputs("[comm!=STR]", stdout);
|
|
asn1_print(&elem);
|
|
return;
|
|
}
|
|
/* default community */
|
|
if (strncmp((char *)elem.data.str, DEF_COMMUNITY,
|
|
sizeof(DEF_COMMUNITY) - 1))
|
|
/* ! "public" */
|
|
printf("C=%.*s ", (int)elem.asnlen, elem.data.str);
|
|
length -= count;
|
|
np += count;
|
|
|
|
/* PDU (Context) */
|
|
if ((count = asn1_parse(np, length, &pdu)) < 0)
|
|
return;
|
|
if (pdu.type != BE_PDU) {
|
|
fputs("[no PDU]", stdout);
|
|
return;
|
|
}
|
|
if (count < length)
|
|
printf("[%d extra after PDU]", length - count);
|
|
asn1_print(&pdu);
|
|
/* descend into PDU */
|
|
length = pdu.asnlen;
|
|
np = (u_char *)pdu.data.raw;
|
|
|
|
switch (pdu.id) {
|
|
case TRAP:
|
|
trap_print(np, length);
|
|
break;
|
|
case GETREQ:
|
|
case GETNEXTREQ:
|
|
case GETRESP:
|
|
case SETREQ:
|
|
snmppdu_print(pdu.id, np, length);
|
|
break;
|
|
}
|
|
return;
|
|
}
|