我正在尝试使用 SNMP 协议的 MIB 特定扩展命令。我有一个在嵌入式 Linux 环境中运行的 snmpd 代理。在 snmpd.conf 中，我取消了以下行的注释：
pass .1.3.6.1.4.1.2021.255 /bin/sh /usr/local/passtest
/usr/local/passtest 看起来像这样：
#!/bin/sh -f
PLACE=".1.3.6.1.4.1.2021.255" # NET-SNMP-PASS-MIB::netSnmpPassExamples
REQ="$2" # Requested OID
#
# Process SET requests by simply logging the assigned value
# Note that such "assignments" are not persistent,
# nor is the syntax or requested value validated
#
if [ "$1" = "-s" ]; then
echo $* >> /tmp/passtest.log
exit 0
fi
#
# GETNEXT requests - determine next valid instance
#
if [ "$1" = "-n" ]; then
case "$REQ" in
$PLACE| \
$PLACE.0| \
$PLACE.0.*| \
$PLACE.1) RET=$PLACE.1.0 ;; # netSnmpPassString.0
$PLACE.1.*| \
$PLACE.2| \
$PLACE.2.0| \
$PLACE.2.0.*| \
$PLACE.2.1| \
$PLACE.2.1.0| \
$PLACE.2.1.0.*| \
$PLACE.2.1.1| \
$PLACE.2.1.1.*| \
$PLACE.2.1.2| \
$PLACE.2.1.2.0) RET=$PLACE.2.1.2.1 ;; # netSnmpPassInteger.1
$PLACE.2.1.2.*| \
$PLACE.2.1.3| \
$PLACE.2.1.3.0) RET=$PLACE.2.1.3.1 ;; # netSnmpPassOID.1
$PLACE.2.*| \
$PLACE.3) RET=$PLACE.3.0 ;; # netSnmpPassTimeTicks.0
$PLACE.3.*| \
$PLACE.4) RET=$PLACE.4.0 ;; # netSnmpPassIpAddress.0
$PLACE.4.*| \
$PLACE.5) RET=$PLACE.5.0 ;; # netSnmpPassCounter.0
$PLACE.5.*| \
$PLACE.6) RET=$PLACE.6.0 ;; # netSnmpPassGauge.0
*) exit 0 ;;
esac
else
#
# GET requests - check for valid instance
#
case "$REQ" in
$PLACE.1.0| \
$PLACE.2.1.2.1| \
$PLACE.2.1.3.1| \
$PLACE.3.0| \
$PLACE.4.0| \
$PLACE.5.0| \
$PLACE.6.0) RET=$REQ ;;
*) exit 0 ;;
esac
fi
#
# "Process" GET* requests - return hard-coded value
#
echo "$RET"
case "$RET" in
$PLACE.1.0) echo "string"; echo "Life, the Universe, and Everything"; exit 0 ;;
$PLACE.2.1.2.1) echo "integer"; echo "42"; exit 0 ;;
$PLACE.2.1.3.1) echo "objectid"; echo "$PLACE.99"; exit 0 ;;
$PLACE.3.0) echo "timeticks"; echo "363136200"; exit 0 ;;
$PLACE.4.0) echo "ipaddress"; echo "127.0.0.1"; exit 0 ;;
$PLACE.5.0) echo "counter"; echo "42"; exit 0 ;;
$PLACE.6.0) echo "gauge"; echo "42"; exit 0 ;;
*) echo "string"; echo "ack... $RET $REQ"; exit 0 ;; # Should not happen
esac
MIB 如下所示：
root@sama5d2-xplained:/usr/share/snmp/mibs# cat NET-SNMP-PASS-MIB.txt
NET-SNMP-PASS-MIB DEFINITIONS ::= BEGIN
--
-- Example MIB objects for "pass" and "pass-persist" extension script
--
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, TimeTicks, IpAddress,
Counter32, Gauge32, Integer32 FROM SNMPv2-SMI
SnmpAdminString FROM SNMP-FRAMEWORK-MIB
netSnmpExamples FROM NET-SNMP-EXAMPLES-MIB
;
netSnmpPassExamples MODULE-IDENTITY
LAST-UPDATED "200905280000Z"
ORGANIZATION "www.net-snmp.org"
CONTACT-INFO
"postal: Wes Hardaker
P.O. Box 382
Davis CA 95617
email: net-snmp-coders@lists.sourceforge.net"
DESCRIPTION
"Example MIB objects for pass/pass-persist extension script"
::= { netSnmpExamples 255 }
--
-- Example scalars
--
netSnmpPassString OBJECT-TYPE
SYNTAX SnmpAdminString
MAX-ACCESS read-write
STATUS current
DESCRIPTION "Example string scalar object."
DEFVAL { "Life, the Universe, and Everything" }
::= { netSnmpPassExamples 1 }
netSnmpPassTimeTicks OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-write
STATUS current
DESCRIPTION "Example timetick object."
DEFVAL { 363136200 } -- 42 days, 0:42:42.00
::= { netSnmpPassExamples 3 }
netSnmpPassIpAddress OBJECT-TYPE
SYNTAX IpAddress
MAX-ACCESS read-write
STATUS current
DESCRIPTION "Example IP Address object."
DEFVAL { '7f000001'H } -- 127.0.0.1
::= { netSnmpPassExamples 4 }
netSnmpPassCounter OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION "Example counter object.
Note that this object will always return the value '42'."
::= { netSnmpPassExamples 5 }
netSnmpPassGauge OBJECT-TYPE
SYNTAX Gauge32
MAX-ACCESS read-write
STATUS current
DESCRIPTION "Example Gauge object."
DEFVAL { 42 }
::= { netSnmpPassExamples 6 }
netSnmpPassOIDValue OBJECT IDENTIFIER
::= { netSnmpPassExamples 99 }
--
-- Example Table
--
netSnmpPassTable OBJECT-TYPE
SYNTAX SEQUENCE OF NetSnmpPassEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION "Example table"
::= { netSnmpPassExamples 2 }
netSnmpPassEntry OBJECT-TYPE
SYNTAX NetSnmpPassEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION "Conceptual row in the example table."
INDEX { netSnmpPassIndex }
::= {netSnmpPassTable 1 }
NetSnmpPassEntry ::= SEQUENCE {
netSnmpPassIndex Integer32,
netSnmpPassInteger Integer32,
netSnmpPassOID OBJECT IDENTIFIER
}
netSnmpPassIndex OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION "Arbitrary index into the netSnmpPassTable.
Note that there will always be one row, with index 1"
::= { netSnmpPassEntry 1 }
netSnmpPassInteger OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-write
STATUS current
DESCRIPTION "Example Integer (table) object."
DEFVAL { 42 }
::= { netSnmpPassEntry 2 }
netSnmpPassOID OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
MAX-ACCESS read-write
STATUS current
DESCRIPTION "Example OID (table) object."
DEFVAL { netSnmpPassOIDValue }
::= { netSnmpPassEntry 3 }
END
但是，当我尝试从主机执行 snmpget 时，我得到以下响应：
bernardo@bernardo-ThinkCentre-Edge72:~$ snmpget -v1 -c public 192.168.0.190 .1.3.6.1.4.1.2021.255.1
Error in packet
Reason: (noSuchName) There is no such variable name in this MIB.
Failed object: iso.3.6.1.4.1.2021.255.1
我错过了什么？？