SNMPD 5.1.1 crash

permalink · #1 (**permalink**) 07-31-2006

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Hi there,

=20

We're using net-snmp 51.1 in an embedded Linux system ( Montavista Linux
) on an XSCALE425 CPU and after expanding a private MIB the snmpd
crashes when trying to do a walk on a table that before expanding the
MIB worked fine. The new additions to the MIB can be walked through
without problems.

=20

Running in an embedded Linux system I cannot use gdb so the only think
that I have is a debug trace. The agent uses the old api and before the
crash I can see a trace message about an "evil_client" after returning
from the handler defined for the table that I'm trying to walk through.=20

=20

What is the meaning of "evil client" and what would be the likely cause
of the crash ?=20

=20

Thanks and best regards,

Doru.

=20

=20

=20

=20

In the "agent_handler.c" line 360 I extended the debug message to also
print the address of the handler.

=20

DEBUGMSGTL(("handler:calling", "calling handler %s at address 0x%08X for
mode %s\n",

next_handler->handler_name, *((unsigned long*
)next_handler->access_method),

se_find_label_in_slist("agent_mode", reqinfo->mode)));

=20

The MIB portion that causes the problem is:

=20

---
************************************************** **********************
**

--- Start of Wireless Bridging Site Map Table -
1.3.6.1.4.1.26535.1.16.1

---
************************************************** **********************
**

wlanBridgingSiteMapTable OBJECT-TYPE

SYNTAX SEQUENCE OF WlanBridgingSiteMapEntry

MAX-ACCESS not-accessible

STATUS current

DESCRIPTION

""

::=3D { wirelessBridgeReport 1 }

=20

wlanBridgingSiteMapEntry OBJECT-TYPE

SYNTAX WlanBridgingSiteMapEntry

MAX-ACCESS not-accessible

STATUS current

DESCRIPTION

"A row describing a given entry in the map."

INDEX {wlanBridgingSiteMapBridgeMAC}

::=3D{wlanBridgingSiteMapTable 1 }

=20

WlanBridgingSiteMapEntry ::=3D SEQUENCE {

wlanBridgingSiteMapBridgeMAC OCTET STRING,

wlanBridgingSiteMapIP OCTET STRING,

wlanBridgingSiteMapRadio1MAC OCTET STRING,

wlanBridgingSiteMapRadio2MAC OCTET STRING,

wlanBridgingSiteMapDescription OCTET STRING,

wlanBridgingSiteMapType OCTET STRING,

wlanBridgingSiteMapSS OCTET STRING

}

=20

wlanBridgingSiteMapBridgeMAC OBJECT-TYPE

SYNTAX OCTET STRING (SIZE(1..17))

MAX-ACCESS read-only

STATUS current

DESCRIPTION

""

::=3D {wlanBridgingSiteMapEntry 1}

=20

wlanBridgingSiteMapIP OBJECT-TYPE

SYNTAX OCTET STRING (SIZE(1..16))

MAX-ACCESS read-only

STATUS current

DESCRIPTION

""

::=3D {wlanBridgingSiteMapEntry 2}

=20

wlanBridgingSiteMapRadio1MAC OBJECT-TYPE

SYNTAX OCTET STRING (SIZE(1..17))

MAX-ACCESS read-only

STATUS current

DESCRIPTION

""

::=3D {wlanBridgingSiteMapEntry 3}

=20

wlanBridgingSiteMapRadio2MAC OBJECT-TYPE

SYNTAX OCTET STRING (SIZE(1..17))

MAX-ACCESS read-only

STATUS current

DESCRIPTION

""

::=3D {wlanBridgingSiteMapEntry 4}

=20

wlanBridgingSiteMapDescription OBJECT-TYPE

SYNTAX OCTET STRING (SIZE(1..30))

MAX-ACCESS read-only

STATUS current

DESCRIPTION

""

::=3D {wlanBridgingSiteMapEntry 5}

=20

wlanBridgingSiteMapType OBJECT-TYPE

SYNTAX OCTET STRING (SIZE(1..30))

MAX-ACCESS read-only

STATUS current

DESCRIPTION

""

::=3D {wlanBridgingSiteMapEntry 6}

=20

wlanBridgingSiteMapSS OBJECT-TYPE

SYNTAX OCTET STRING (SIZE(1..30))

MAX-ACCESS read-only

STATUS current

DESCRIPTION

""

::=3D {wlanBridgingSiteMapEntry 7}

=20

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---------Debug trace --------------------

=20

trace: netsnmp_udp_recv(): snmpUDPDomain.c, 128:

netsnmp_udp: recvfrom fd 15 got 58 bytes (from 192.168.254.2)

trace: _sess_process_packet(): snmp_api.c, 4882:

sess_process_packet: session 0x7bd30 fd 15 pkt 0x81000 length 58

dumpx_recv:02 01 03=20

dumpv_recv: Integer: 3 (0x03)

trace: snmpv3_parse(): snmp_api.c, 3381:

dumph_recv: SNMPv3 Message

trace: snmpv3_parse(): snmp_api.c, 3396:

dumph_recv: SNMP Version Number

dumpx_recv: 02 01 03=20

dumpv_recv: Integer: 3 (0x03)

trace: snmpv3_parse(): snmp_api.c, 3412:

dumph_recv: msgGlobalData

trace: snmpv3_parse(): snmp_api.c, 3429:

dumph_recv: msgID

dumpx_recv: 02 01 16=20

dumpv_recv: Integer: 22 (0x16)

trace: snmpv3_parse(): snmp_api.c, 3461:

dumph_recv: msgMaxSize

dumpx_recv: 02 03 00 FF F0=20

dumpv_recv: Integer: 65520 (0xFFF0)

trace: snmpv3_parse(): snmp_api.c, 3499:

snmpv3_parse: msgMaxSize 65520 received

trace: snmpv3_parse(): snmp_api.c, 3507:

dumph_recv: msgFlags

dumpx_recv: 04 01 04=20

dumpv_recv: String: .

trace: snmpv3_parse(): snmp_api.c, 3525:

dumph_recv: msgSecurityModel

dumpx_recv: 02 01 03=20

dumpv_recv: Integer: 3 (0x03)

trace: snmpv3_parse(): snmp_api.c, 3599:

dumph_recv: SM msgSecurityParameters

trace: usm_process_in_msg(): snmpusm.c, 2299:

usm: USM processing begun...

trace: usm_parse_security_parameters(): snmpusm.c, 1868:

dumph_recv: msgAuthoritativeEngineID

dumpx_recv: 04 00=20

dumpv_recv: String: =20

trace: usm_parse_security_parameters(): snmpusm.c, 1891:

dumph_recv: msgAuthoritativeEngineBoots

dumpx_recv: 02 01 00=20

dumpv_recv: Integer: 0 (0x00)

trace: usm_parse_security_parameters(): snmpusm.c, 1915:

dumph_recv: msgAuthoritativeEngineTime

dumpx_recv: 02 01 00=20

dumpv_recv: Integer: 0 (0x00)

trace: usm_parse_security_parameters(): snmpusm.c, 1943:

dumph_recv: msgUserName

dumpx_recv: 04 00=20

dumpv_recv: String: =20

trace: usm_parse_security_parameters(): snmpusm.c, 1986:

dumph_recv: msgAuthenticationParameters

dumpx_recv: 04 00=20

dumpv_recv: String: =20

trace: usm_parse_security_parameters(): snmpusm.c, 2015:

dumph_recv: msgPrivacyParameters

dumpx_recv: 04 00=20

dumpv_recv: String: =20

trace: usm_process_in_msg(): snmpusm.c, 2398:

usm: Unknown Engine ID.

trace: snmpv3_parse(): snmp_api.c, 3629:

dumph_recv: ScopedPDU

trace: snmpv3_scopedPDU_parse(): snmp_api.c, 4377:

dumph_recv: contextEngineID

dumpx_recv: 04 00=20

dumpv_recv: String: =20

trace: snmpv3_scopedPDU_parse(): snmp_api.c, 4401:

dumph_recv: contextName

dumpx_recv: 04 00=20

dumpv_recv: String: =20

trace: snmpv3_parse(): snmp_api.c, 3637:

dumph_recv: PDU-GET

trace: snmp_pdu_parse(): snmp_api.c, 4175:

dumph_recv: request_id

dumpx_recv: 02 01 15=20

dumpv_recv: Integer: 21 (0x15)

trace: snmp_pdu_parse(): snmp_api.c, 4186:

dumph_recv: error status

dumpx_recv: 02 01 00=20

dumpv_recv: Integer: 0 (0x00)

trace: snmp_pdu_parse(): snmp_api.c, 4197:

dumph_recv: error index

dumpx_recv: 02 01 00=20

dumpv_recv: Integer: 0 (0x00)

trace: snmp_pdu_parse(): snmp_api.c, 4209:

dumph_recv: VarBindList

trace: _snmp_parse(): snmp_api.c, 3985:

snmp_parse: Parsed SNMPv3 message (secName:, secLevel:noAuthNoPriv): USM
unknown engineID

trace: snmpv3_build(): snmp_api.c, 2042:

snmp_build: Building SNMPv3 message (secName:"",
secLevel:noAuthNoPriv)...

trace: snmpv3_build(): snmp_api.c, 2044:

dumph_send: SNMPv3 Message

trace: snmpv3_packet_realloc_rbuild(): snmp_api.c, 2391:

dumph_send: PDU-REPORT

trace: snmp_pdu_realloc_rbuild(): snmp_api.c, 3125:

snmp_pdu_realloc_rbuild: starting

trace: snmp_pdu_realloc_rbuild(): snmp_api.c, 3140:

dumph_send: VarBind

trace: snmp_realloc_rbuild_var_op(): snmp.c, 337:

dumph_send: Value

dumpx_send: 41 01 03=20

dumpv_send: UInteger: 3 (0x03)

trace: snmp_realloc_rbuild_var_op(): snmp.c, 434:

dumph_send: Name

dumpx_send: 06 0A 2B 06 01 06 03 0F 01 01 04 00=20

dumpv_send: ObjID: iso.3.6.1.6.3.15.1.1.4.0

trace: snmp_pdu_realloc_rbuild(): snmp_api.c, 3208:

dumph_send: error index

dumpx_send: 02 01 00=20

dumpv_send: Integer: 0 (0x00)

trace: snmp_pdu_realloc_rbuild(): snmp_api.c, 3221:

dumph_send: error status

dumpx_send: 02 01 00=20

dumpv_send: Integer: 0 (0x00)

trace: snmp_pdu_realloc_rbuild(): snmp_api.c, 3234:

dumph_send: request_id

dumpx_send: 02 01 15=20

dumpv_send: Integer: 21 (0x15)

trace: snmpv3_packet_realloc_rbuild(): snmp_api.c, 2409:

dumph_send: ScopedPdu

trace: snmpv3_scopedPDU_header_realloc_rbuild(): snmp_api.c, 2337:

dumph_send: contextName

dumpx_send: 04 00=20

dumpv_send: String: [NULL]

trace: snmpv3_scopedPDU_header_realloc_rbuild(): snmp_api.c, 2351:

dumph_send: contextEngineID

dumpx_send: 04 0B 80 00 1F 88 04 76 33 73 6E 6D 70=20

dumpv_send: String: .....v3snmp

trace: snmpv3_header_realloc_rbuild(): snmp_api.c, 2208:

dumph_send: msgSecurityModel

dumpx_send: 02 01 03=20

dumpv_send: Integer: 3 (0x03)

trace: snmpv3_header_realloc_rbuild(): snmp_api.c, 2222:

dumph_send: msgFlags

dumpx_send: 04 01 00=20

dumpv_send: String: .

trace: snmpv3_header_realloc_rbuild(): snmp_api.c, 2236:

dumph_send: msgMaxSize

dumpx_send: 02 03 00 FF E3=20

dumpv_send: Integer: 65507 (0xFFE3)

trace: snmpv3_header_realloc_rbuild(): snmp_api.c, 2249:

dumph_send: msgID

dumpx_send: 02 01 16=20

dumpv_send: Integer: 22 (0x16)

trace: snmpv3_header_realloc_rbuild(): snmp_api.c, 2273:

dumph_send: SNMP Version Number

dumpx_send: 02 01 03=20

dumpv_send: Integer: 3 (0x03)

trace: snmpv3_packet_realloc_rbuild(): snmp_api.c, 2437:

dumph_send: SM msgSecurityParameters

trace: usm_rgenerate_out_msg(): snmpusm.c, 1356:

usm: USM processing has begun (offset 47)

trace: usm_get_user(): snmpusm.c, 2890:

usm: getting user=20

trace: sc_hash(): scapi.c, 386:

trace: sc_get_properlength(): scapi.c, 115:

trace: get_enginetime(): lcd_time.c, 153:

lcd_get_enginetime: engineID 80 00 1F 88 04 76 33 73 6E 6D 70 :
boots=3D10, time=3D200

trace: usm_rgenerate_out_msg(): snmpusm.c, 1579:

dumph_send: msgPrivacyParameters

dumpx_send: 04 00=20

dumpv_send: String: [NULL]

trace: usm_rgenerate_out_msg(): snmpusm.c, 1595:

dumph_send: msgAuthenticationParameters

dumpx_send: 04 00=20

dumpv_send: String: [NULL]

trace: usm_rgenerate_out_msg(): snmpusm.c, 1627:

dumph_send: msgUserName

dumpx_send: 04 00=20

dumpv_send: String: [NULL]

trace: usm_rgenerate_out_msg(): snmpusm.c, 1642:

dumph_send: msgAuthoritativeEngineTime

dumpx_send: 02 02 00 C8=20

dumpv_send: Integer: 200 (0xC8)

trace: usm_rgenerate_out_msg(): snmpusm.c, 1658:

dumph_send: msgAuthoritativeEngineBoots

dumpx_send: 02 01 0A=20

dumpv_send: Integer: 10 (0x0A)

trace: usm_rgenerate_out_msg(): snmpusm.c, 1671:

dumph_send: msgAuthoritativeEngineID

dumpx_send: 04 0B 80 00 1F 88 04 76 33 73 6E 6D 70=20

dumpv_send: String: .....v3snmp

trace: usm_rgenerate_out_msg(): snmpusm.c, 1780:

usm: USM processing completed.

trace: netsnmp_udp_send(): snmpUDPDomain.c, 161:

netsnmp_udp: send 98 bytes from 0x7cf9e to 192.168.254.2 on fd 15

trace: _sess_process_packet(): snmp_api.c, 4934:

sess_process_packet: parse fail

trace: _sess_process_packet(): snmp_api.c, 4939:

sess_process_packet: post-parse fail

trace: _sess_read(): snmp_api.c, 5200:

sess_read: not reading 13 (fdset 0xbfffecc0 set 0)

trace: snmp_sess_select_info(): snmp_api.c, 5612:

sess_select: for all sessions: 15 13=20

trace: receive(): snmpd.c, 1170:

snmpd/select: select( numfds=3D16, ..., tvp=3D0xbfffebb8)

trace: receive(): snmpd.c, 1172:

snmpd/select: returned, count =3D 1

trace: netsnmp_udp_recv(): snmpUDPDomain.c, 128:

netsnmp_udp: recvfrom fd 15 got 123 bytes (from 192.168.254.2)

trace: _sess_process_packet(): snmp_api.c, 4882:

sess_process_packet: session 0x7bd30 fd 15 pkt 0x81000 length 123

dumpx_recv:02 01 03=20

dumpv_recv: Integer: 3 (0x03)

trace: snmpv3_parse(): snmp_api.c, 3381:

dumph_recv: SNMPv3 Message

trace: snmpv3_parse(): snmp_api.c, 3396:

dumph_recv: SNMP Version Number

dumpx_recv: 02 01 03=20

dumpv_recv: Integer: 3 (0x03)

trace: snmpv3_parse(): snmp_api.c, 3412:

dumph_recv: msgGlobalData

trace: snmpv3_parse(): snmp_api.c, 3429:

dumph_recv: msgID

dumpx_recv: 02 01 17=20

dumpv_recv: Integer: 23 (0x17)

trace: snmpv3_parse(): snmp_api.c, 3461:

dumph_recv: msgMaxSize

dumpx_recv: 02 03 00 FF F0=20

dumpv_recv: Integer: 65520 (0xFFF0)

trace: snmpv3_parse(): snmp_api.c, 3499:

snmpv3_parse: msgMaxSize 65520 received

trace: snmpv3_parse(): snmp_api.c, 3507:

dumph_recv: msgFlags

dumpx_recv: 04 01 07=20

dumpv_recv: String: .

trace: snmpv3_parse(): snmp_api.c, 3525:

dumph_recv: msgSecurityModel

dumpx_recv: 02 01 03=20

dumpv_recv: Integer: 3 (0x03)

trace: snmpv3_parse(): snmp_api.c, 3599:

dumph_recv: SM msgSecurityParameters

trace: usm_process_in_msg(): snmpusm.c, 2299:

usm: USM processing begun...

trace: usm_parse_security_parameters(): snmpusm.c, 1868:

dumph_recv: msgAuthoritativeEngineID

dumpx_recv: 04 0B 80 00 1F 88 04 76 33 73 6E 6D 70=20

dumpv_recv: String: .....v3snmp

trace: usm_parse_security_parameters(): snmpusm.c, 1891:

dumph_recv: msgAuthoritativeEngineBoots

dumpx_recv: 02 01 0A=20

dumpv_recv: Integer: 10 (0x0A)

trace: usm_parse_security_parameters(): snmpusm.c, 1915:

dumph_recv: msgAuthoritativeEngineTime

dumpx_recv: 02 02 00 C9=20

dumpv_recv: Integer: 201 (0xC9)

trace: usm_parse_security_parameters(): snmpusm.c, 1943:

dumph_recv: msgUserName

dumpx_recv: 04 04 64 6F 72 75=20

dumpv_recv: String: doru

trace: usm_parse_security_parameters(): snmpusm.c, 1986:

dumph_recv: msgAuthenticationParameters

dumpx_recv: 04 0C FB CD 8A 9F C1 7C 70 E0 C5 23 5A 79=20

dumpv_recv: String: .....|p..#Zy

trace: usm_parse_security_parameters(): snmpusm.c, 2015:

dumph_recv: msgPrivacyParameters

dumpx_recv: 04 08 00 00 00 00 00 00 00 0C=20

dumpv_recv: String: ........

trace: sc_hash(): scapi.c, 386:

trace: sc_get_properlength(): scapi.c, 115:

trace: get_enginetime(): lcd_time.c, 153:

lcd_get_enginetime: engineID 80 00 1F 88 04 76 33 73 6E 6D 70 :
boots=3D10, time=3D201

trace: usm_check_secLevel(): snmpusm.c, 2783:

comparex: Comparing: 1 3 iso.3.6.1.6.3.10.1.2.1

trace: sc_check_keyed_hash(): scapi.c, 501:

trace: sc_generate_keyed_hash(): scapi.c, 256:

trace: sc_get_properlength(): scapi.c, 115:

trace: usm_process_in_msg(): snmpusm.c, 2467:

usm: Verification succeeded.

trace: sc_decrypt(): scapi.c, 867:

trace: usm_process_in_msg(): snmpusm.c, 2649:

usm: USM processing completed.

trace: snmpv3_parse(): snmp_api.c, 3660:

dumph_recv: ScopedPDU

trace: snmpv3_scopedPDU_parse(): snmp_api.c, 4377:

dumph_recv: contextEngineID

dumpx_recv: 04 0B 80 00 1F 88 04 76 33 73 6E 6D 70=20

dumpv_recv: String: .....v3snmp

trace: snmpv3_scopedPDU_parse(): snmp_api.c, 4401:

dumph_recv: contextName

dumpx_recv: 04 00=20

dumpv_recv: String: =20

trace: snmpv3_parse(): snmp_api.c, 3685:

dumph_recv: PDU-GETBULK

trace: snmp_pdu_parse(): snmp_api.c, 4175:

dumph_recv: request_id

dumpx_recv: 02 01 16=20

dumpv_recv: Integer: 22 (0x16)

trace: snmp_pdu_parse(): snmp_api.c, 4186:

dumph_recv: error status

dumpx_recv: 02 01 00=20

dumpv_recv: Integer: 0 (0x00)

trace: snmp_pdu_parse(): snmp_api.c, 4197:

dumph_recv: error index

dumpx_recv: 02 01 0A=20

dumpv_recv: Integer: 10 (0x0A)

trace: snmp_pdu_parse(): snmp_api.c, 4209:

dumph_recv: VarBindList

trace: snmp_pdu_parse(): snmp_api.c, 4239:

dumph_recv: VarBind

trace: snmp_parse_var_op(): snmp.c, 166:

dumph_recv: Name

dumpx_recv: 06 0A 2B 06 01 04 01 81 CF 27 01 10=20

dumpv_recv: ObjID: iso.3.6.1.4.1.26535.1.16

trace: snmp_pdu_parse(): snmp_api.c, 4248:

dumph_recv: Value

trace: _snmp_parse(): snmp_api.c, 3985:

snmp_parse: Parsed SNMPv3 message (secName:doru, secLevel:authPriv):=20

trace: init_agent_snmp_session(): snmp_agent.c, 1115:

snmp_agent: agent_sesion 0x07f500 created

trace: snmp_call_callbacks(): callback.c, 176:

callback: START calling callbacks for maj=3D1 min=3D5

trace: snmp_call_callbacks(): callback.c, 184:

callback: calling a callback for maj=3D1 min=3D5

vacm_in_view: ver=3D3, model=3D3, secName=3Ddoru

trace: netsnmp_subtree_find_first(): agent_registry.c, 156:

subtree: looking for subtree for context: ""

trace: netsnmp_subtree_find_first(): agent_registry.c, 160:

subtree: found one for: ""

trace: vacm_in_view(): mibgroup/mibII/vacm_vars.c, 861:

mibII/vacm_vars: vacm_in_view: sn=3Ddoru, gn=3DanonymousGroupName000, =
Done
checking setup

trace: snmp_call_callbacks(): callback.c, 196:

callback: END calling callbacks for maj=3D1 min=3D5 (1 called)

trace: netsnmp_create_subtree_cache(): snmp_agent.c, 2009:

snmp_agent: GETBULK N =3D 0, M =3D 10, R =3D 1

trace: netsnmp_add_varbind_to_cache(): snmp_agent.c, 1709:

snmp_agent: add_vb_to_cache( 0x7f500, 1, iso.3.6.1.4.1.26535.1.16,
0x69080)

trace: snmp_call_callbacks(): callback.c, 176:

callback: START calling callbacks for maj=3D1 min=3D12

trace: snmp_call_callbacks(): callback.c, 184:

callback: calling a callback for maj=3D1 min=3D12

vacm_in_view: ver=3D3, model=3D3, secName=3Ddoru

trace: netsnmp_subtree_find_first(): agent_registry.c, 156:

subtree: looking for subtree for context: ""

trace: netsnmp_subtree_find_first(): agent_registry.c, 160:

subtree: found one for: ""

trace: vacm_in_view(): mibgroup/mibII/vacm_vars.c, 861:

mibII/vacm_vars: vacm_in_view: sn=3Ddoru, gn=3DanonymousGroupName000,
vn=3DanonymousView000

trace: vacm_checkSubtree(): vacm.c, 526:

vacm:checkSubtree: , included

trace: snmp_call_callbacks(): callback.c, 196:

callback: END calling callbacks for maj=3D1 min=3D12 (1 called)

trace: netsnmp_add_varbind_to_cache(): snmp_agent.c, 1774:

snmp_agent: tp->start iso.3.6.1.4.1.26535.1.15.2, tp->end
iso.3.6.1.4.1.26535.1.16.1.1.1,=20

trace: netsnmp_call_handlers(): agent_handler.c, 426:

handler:calling: main handler bulk_to_next

trace: netsnmp_call_handler(): agent_handler.c, 362:

handler:calling: calling handler bulk_to_next at address 0x4054B7FC for
mode GETBULK

trace: netsnmp_call_handler(): agent_handler.c, 362:

handler:calling: calling handler null at address 0x4054E2F8 for mode
GETNEXT

trace: netsnmp_null_handler(): null.c, 37:

helper:null: Got request

trace: netsnmp_null_handler(): null.c, 39:

helper:null: oid:iso.3.6.1.4.1.26535.1.16

trace: netsnmp_call_handler(): agent_handler.c, 370:

handler:returned: handler null returned 0

trace: netsnmp_call_handler(): agent_handler.c, 370:

handler:returned: handler bulk_to_next returned 0

trace: handle_getnext_loop(): snmp_agent.c, 2673:

results: getnext results, before next pass:

trace: handle_getnext_loop(): snmp_agent.c, 2676:

results: trace: sprint_realloc_by_type(): mib.c, 1971:

output: sprint_by_type, type 5

iso.3.6.1.4.1.26535.1.16 =3D NULL

trace: handle_getnext_loop(): snmp_agent.c, 2676:

results: trace: sprint_realloc_by_type(): mib.c, 1971:

output: sprint_by_type, type 5

.. =3D NULL

trace: handle_getnext_loop(): snmp_agent.c, 2676:

results: trace: sprint_realloc_by_type(): mib.c, 1971:

output: sprint_by_type, type 5

.. =3D NULL

trace: handle_getnext_loop(): snmp_agent.c, 2676:

results: trace: sprint_realloc_by_type(): mib.c, 1971:

output: sprint_by_type, type 5

.. =3D NULL

trace: handle_getnext_loop(): snmp_agent.c, 2676:

results: trace: sprint_realloc_by_type(): mib.c, 1971:

output: sprint_by_type, type 5

.. =3D NULL

trace: handle_getnext_loop(): snmp_agent.c, 2676:

results: trace: sprint_realloc_by_type(): mib.c, 1971:

output: sprint_by_type, type 5

.. =3D NULL

trace: handle_getnext_loop(): snmp_agent.c, 2676:

results: trace: sprint_realloc_by_type(): mib.c, 1971:

output: sprint_by_type, type 5

.. =3D NULL

trace: handle_getnext_loop(): snmp_agent.c, 2676:

results: trace: sprint_realloc_by_type(): mib.c, 1971:

output: sprint_by_type, type 5

.. =3D NULL

trace: handle_getnext_loop(): snmp_agent.c, 2676:

results: trace: sprint_realloc_by_type(): mib.c, 1971:

output: sprint_by_type, type 5

.. =3D NULL

trace: handle_getnext_loop(): snmp_agent.c, 2676:

results: trace: sprint_realloc_by_type(): mib.c, 1971:

output: sprint_by_type, type 5

.. =3D NULL

trace: netsnmp_add_varbind_to_cache(): snmp_agent.c, 1709:

snmp_agent: add_vb_to_cache( 0x7f500, 1, iso.3.6.1.4.1.26535.1.16,
0x6c000)

trace: snmp_call_callbacks(): callback.c, 176:

callback: START calling callbacks for maj=3D1 min=3D12

trace: snmp_call_callbacks(): callback.c, 184:

callback: calling a callback for maj=3D1 min=3D12

vacm_in_view: ver=3D3, model=3D3, secName=3Ddoru

trace: netsnmp_subtree_find_first(): agent_registry.c, 156:

subtree: looking for subtree for context: ""

trace: netsnmp_subtree_find_first(): agent_registry.c, 160:

subtree: found one for: ""

trace: vacm_in_view(): mibgroup/mibII/vacm_vars.c, 861:

mibII/vacm_vars: vacm_in_view: sn=3Ddoru, gn=3DanonymousGroupName000,
vn=3DanonymousView000

trace: vacm_checkSubtree(): vacm.c, 526:

vacm:checkSubtree: , included

trace: snmp_call_callbacks(): callback.c, 196:

callback: END calling callbacks for maj=3D1 min=3D12 (1 called)

trace: netsnmp_add_varbind_to_cache(): snmp_agent.c, 1774:

snmp_agent: tp->start iso.3.6.1.4.1.26535.1.16.1.1.1, tp->end
iso.3.6.1.4.1.26535.1.16.1.1.2,=20

trace: netsnmp_call_handlers(): agent_handler.c, 426:

handler:calling: main handler bulk_to_next

trace: netsnmp_call_handler(): agent_handler.c, 362:

handler:calling: calling handler bulk_to_next at address 0x4054B7FC for
mode GETBULK

trace: netsnmp_call_handler(): agent_handler.c, 362:

handler:calling: calling handler old_api at address 0x4054EA14 for mode
GETNEXT

magic=3D131 var_wlanSiteMapTable length=3D9 magic=3D171=20

name=3D1.3.6.1.4.1.26535.1.16.

Vp-name=3D1.3.6.1.4.1.26535.1.16.1.1.1

find "next" entry!

index=3D0=20

trace: netsnmp_old_api_helper(): old_api.c, 315:

old_api: evil_client: private mibs=20

trace: netsnmp_call_handler(): agent_handler.c, 370:

handler:returned: handler old_api returned 0

trace: netsnmp_call_handler(): agent_handler.c, 370:

handler:returned: handler bulk_to_next returned 0

trace: handle_getnext_loop(): snmp_agent.c, 2673:

results: getnext results, before next pass:

trace: handle_getnext_loop(): snmp_agent.c, 2676:

results: trace: sprint_realloc_by_type(): mib.c, 1971:

output: sprint_by_type, type 5

iso.3.6.1.4.1.26535.1.16 =3D NULL

trace: handle_getnext_loop(): snmp_agent.c, 2676:

results: trace: sprint_realloc_by_type(): mib.c, 1971:

output: sprint_by_type, type 5

.. =3D NULL

trace: handle_getnext_loop(): snmp_agent.c, 2676:

results: trace: sprint_realloc_by_type(): mib.c, 1971:

output: sprint_by_type, type 5

.. =3D NULL

trace: handle_getnext_loop(): snmp_agent.c, 2676:

results: trace: sprint_realloc_by_type(): mib.c, 1971:

output: sprint_by_type, type 5

.. =3D NULL

trace: handle_getnext_loop(): snmp_agent.c, 2676:

results: trace: sprint_realloc_by_type(): mib.c, 1971:

output: sprint_by_type, type 5

.. =3D NULL

trace: handle_getnext_loop(): snmp_agent.c, 2676:

results: trace: sprint_realloc_by_type(): mib.c, 1971:

output: sprint_by_type, type 5

.. =3D NULL

trace: handle_getnext_loop(): snmp_agent.c, 2676:

results: trace: sprint_realloc_by_type(): mib.c, 1971:

output: sprint_by_type, type 5

.. =3D NULL

trace: handle_getnext_loop(): snmp_agent.c, 2676:

results: trace: sprint_realloc_by_type(): mib.c, 1971:

output: sprint_by_type, type 5

.. =3D NULL

trace: handle_getnext_loop(): snmp_agent.c, 2676:

results: trace: sprint_realloc_by_type(): mib.c, 1971:

output: sprint_by_type, type 5

.. =3D NULL

trace: handle_getnext_loop(): snmp_agent.c, 2676:

results: trace: sprint_realloc_by_type(): mib.c, 1971:

output: sprint_by_type, type 5

.. =3D NULL

trace: netsnmp_add_varbind_to_cache(): snmp_agent.c, 1709:

snmp_agent: add_vb_to_cache( 0x7f500, 1, iso.3.6.1.4.1.26535.1.16,
0x6ce80)

trace: snmp_call_callbacks(): callback.c, 176:

callback: START calling callbacks for maj=3D1 min=3D12

trace: snmp_call_callbacks(): callback.c, 184:

callback: calling a callback for maj=3D1 min=3D12

vacm_in_view: ver=3D3, model=3D3, secName=3Ddoru

trace: netsnmp_subtree_find_first(): agent_registry.c, 156:

subtree: looking for subtree for context: ""

trace: netsnmp_subtree_find_first(): agent_registry.c, 160:

subtree: found one for: ""

trace: vacm_in_view(): mibgroup/mibII/vacm_vars.c, 861:

mibII/vacm_vars: vacm_in_view: sn=3Ddoru, gn=3DanonymousGroupName000,
vn=3DanonymousView000

trace: vacm_checkSubtree(): vacm.c, 526:

vacm:checkSubtree: , included

trace: snmp_call_callbacks(): callback.c, 196:

callback: END calling callbacks for maj=3D1 min=3D12 (1 called)

trace: netsnmp_add_varbind_to_cache(): snmp_agent.c, 1774:

snmp_agent: tp->start iso.3.6.1.4.1.26535.1.16.1.1.2, tp->end
iso.3.6.1.4.1.26535.1.16.1.1.3,=20

trace: netsnmp_call_handlers(): agent_handler.c, 426:

handler:calling: main handler bulk_to_next

trace: netsnmp_call_handler(): agent_handler.c, 362:

handler:calling: calling handler bulk_to_next at address 0x4054B7FC for
mode GETBULK

trace: netsnmp_call_handler(): agent_handler.c, 362:

handler:calling: calling handler old_api at address 0x4054EA14 for mode
GETNEXT

root

Password:=20

=20

=20

BusyBox v0.60.1 (2006.07.27-18:08+0000) Built-in shell (ash)

Enter 'help' for a list of built-in commands.

=20

------_=_NextPart_001_01C6B261.DE467096
Content-Type: text/html;
charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

<html xmlns:o=3D"urn:schemas-microsoft-com:office:office" =
xmlns:w=3D"urn:schemas-microsoft-com:office:word" =
xmlns=3D"http://www.w3.org/TR/REC-html40">

<head>
<meta http-equiv=3DContent-Type content=3D"text/html; =
charset=3Dus-ascii">
<meta name=3DGenerator content=3D"Microsoft Word 11 (filtered medium)">
<style>

</style>

</head>

<body lang=3DEN-US link=3Dblue vlink=3Dpurple>

<div class=3DSection1>

Hi there,<o:p></o:p>

<o:p> </o:p>

We’re using net-snmp 51.1 in an embedded Linux =
system (
Montavista Linux ) on an XSCALE425 CPU and after expanding a private MIB =
the snmpd
crashes when trying to do a walk on a table that before expanding the =
MIB
worked fine. The new additions to the MIB can be walked through without
problems.<o:p></o:p>

<o:p> </o:p>

Running in an embedded Linux system I cannot use gdb =
so the
only think that I have is a debug trace. The agent uses the old api and =
before
the crash I can see a trace message about an “evil_client” =
after
returning from the handler defined for the table that I’m trying =
to walk
through. <o:p></o:p>

<o:p> </o:p>

What is the meaning of “evil client” =
 and
what would be the likely cause of the crash ? =
<o:p></o:p>

<o:p> </o:p>

Thanks and best regards,<o:p></o:p>

Doru.<o:p></o:p>

<o:p> </o:p>

<o:p> </o:p>

<o:p> </o:p>

<o:p> </o:p>

In the “agent_handler.c” line 360 I =
extended the
debug message to also print the address of the =
handler.<o:p></o:p>

<o:p> </o:p>

DEBUGMSGTL(("handler:calling",
"calling handler %s at address 0x%08X for mode =
%s\n",<o:p></o:p>

       &n bsp;   &=
nbsp;   
next_handler->handler_name, *((unsigned long*
)next_handler->access_method),<o:p></o:p>

       &n bsp;   &=
nbsp;   
se_find_label_in_slist("agent_mode", =
reqinfo->mode)));<o:p></o:p>

<o:p> </o:p>

The MIB portion that causes the problem =
is:<o:p></o:p>

<o:p> </o:p>

    ---  
************************************************** ***********************=
*<o:p></o:p>

    ---    =
Start of
Wireless Bridging Site Map Table - =
1.3.6.1.4.1.26535.1.16.1<o:p></o:p>

    ---  
************************************************** ***********************=
*<o:p></o:p>

    wlanBridgingSiteMapTable
OBJECT-TYPE<o:p></o:p>

       &n bsp;   
SYNTAX       &n bsp;   &=
nbsp; SEQUENCE
OF WlanBridgingSiteMapEntry<o:p></o:p>

       &n bsp;   
MAX-ACCESS       &n bsp; =
not-accessible<o:p></o:p>

       &n bsp;   
STATUS       &n bsp;   &=
nbsp; current<o:p></o:p>

       &n bsp;   
DESCRIPTION<o:p></o:p>

       &n bsp;   &=
nbsp;       
""<o:p></o:p>

       &n bsp;   
::=3D { wirelessBridgeReport 1 }<o:p></o:p>

<o:p> </o:p>

    wlanBridgingSiteMapEntry
OBJECT-TYPE<o:p></o:p>

       &n bsp;   
SYNTAX        =
WlanBridgingSiteMapEntry<o:p></o:p>

       &n bsp;   
MAX-ACCESS    not-accessible<o:p></o:p>

       &n bsp;   
STATUS        =
current<o:p></o:p>

       &n bsp;   
DESCRIPTION<o:p></o:p>

       &n bsp;   &=
nbsp;       
"A row describing a given entry in the =
map."<o:p></o:p>

       &n bsp;   
INDEX        =
{wlanBridgingSiteMapBridgeMAC}<o:p></o:p>

       &n bsp;   
::=3D{wlanBridgingSiteMapTable   &n bsp;    =
1 }<o:p></o:p>

<o:p> </o:p>

    WlanBridgingSiteMapEntry =
::=3D
SEQUENCE {<o:p></o:p>

       &n bsp;   
wlanBridgingSiteMapBridgeMAC   &nbs p;    =
OCTET
STRING,<o:p></o:p>

       &n bsp;   
wlanBridgingSiteMapIP    &nbsp ;   =
       OCTET
STRING,<o:p></o:p>

       &n bsp;   
wlanBridgingSiteMapRadio1MAC   &nbs p;    =
OCTET
STRING,<o:p></o:p>

       &n bsp;   
wlanBridgingSiteMapRadio2MAC   &nbs p;    =
OCTET
STRING,<o:p></o:p>

       &n bsp;   
wlanBridgingSiteMapDescription   &n bsp;  OCTET =
STRING,<o:p></o:p>

       &n bsp;   
wlanBridgingSiteMapType    &nb sp;   &n=
bsp;   
OCTET STRING,<o:p></o:p>

       &n bsp;   
wlanBridgingSiteMapSS    &nbsp ;   &nbs=
p;     
OCTET STRING<o:p></o:p>

    =
}<o:p></o:p>

<o:p> </o:p>

    =
wlanBridgingSiteMapBridgeMAC
OBJECT-TYPE<o:p></o:p>

       &n bsp;   
SYNTAX       &n bsp;    =
OCTET
STRING (SIZE(1..17))<o:p></o:p>

       &n bsp;   
MAX-ACCESS        =
read-only<o:p></o:p>

       &n bsp;   
STATUS       &n bsp;   =
 current<o:p></o:p>

       &n bsp;   
DESCRIPTION<o:p></o:p>

       &n bsp;   &=
nbsp;       
""<o:p></o:p>

       &n bsp;   
::=3D {wlanBridgingSiteMapEntry 1}<o:p></o:p>

<o:p> </o:p>

    wlanBridgingSiteMapIP =
OBJECT-TYPE<o:p></o:p>

       &n bsp;   
SYNTAX       &n bsp;    =
OCTET
STRING (SIZE(1..16))<o:p></o:p>

       &n bsp;   
MAX-ACCESS        =
read-only<o:p></o:p>

       &n bsp;   
STATUS       &n bsp;    =
current<o:p></o:p>

       &n bsp;   
DESCRIPTION<o:p></o:p>

       &n bsp;   &=
nbsp;       
""<o:p></o:p>

       &n bsp;   
::=3D {wlanBridgingSiteMapEntry 2}<o:p></o:p>

<o:p> </o:p>

    =
wlanBridgingSiteMapRadio1MAC
OBJECT-TYPE<o:p></o:p>

       &n bsp;   
SYNTAX       &n bsp;    =
OCTET
STRING (SIZE(1..17))<o:p></o:p>

       &n bsp;   
MAX-ACCESS        =
read-only<o:p></o:p>

       &n bsp;   
STATUS       &n bsp;    =
current<o:p></o:p>

       &n bsp;   
DESCRIPTION<o:p></o:p>

       &n bsp;   &=
nbsp;       
""<o:p></o:p>

       &n bsp;   
::=3D {wlanBridgingSiteMapEntry 3}<o:p></o:p>

<o:p> </o:p>

    =
wlanBridgingSiteMapRadio2MAC
OBJECT-TYPE<o:p></o:p>

       &n bsp;   
SYNTAX       &n bsp;    =
OCTET
STRING (SIZE(1..17))<o:p></o:p>

       &n bsp;   
MAX-ACCESS        =
read-only<o:p></o:p>

       &n bsp;   
STATUS       &n bsp;    =
current<o:p></o:p>

       &n bsp;   
DESCRIPTION<o:p></o:p>

       &n bsp;   &=
nbsp;       
""<o:p></o:p>

       &n bsp;   
::=3D {wlanBridgingSiteMapEntry 4}<o:p></o:p>

<o:p> </o:p>

    =
wlanBridgingSiteMapDescription
OBJECT-TYPE<o:p></o:p>

       &n bsp;   
SYNTAX       &n bsp;    =
OCTET
STRING (SIZE(1..30))<o:p></o:p>

       &n bsp;   
MAX-ACCESS        =
read-only<o:p></o:p>

       &n bsp;   
STATUS       &n bsp;    =
current<o:p></o:p>

       &n bsp;   
DESCRIPTION<o:p></o:p>

       &n bsp;   &=
nbsp;       
""<o:p></o:p>

       &n bsp;   
::=3D {wlanBridgingSiteMapEntry 5}<o:p></o:p>

<o:p> </o:p>

    wlanBridgingSiteMapType
OBJECT-TYPE<o:p></o:p>

       &n bsp;   
SYNTAX       &n bsp;    =
OCTET
STRING (SIZE(1..30))<o:p></o:p>

       &n bsp;   
MAX-ACCESS        =
read-only<o:p></o:p>

       &n bsp;   
STATUS       &n bsp;    =
current<o:p></o:p>

       &n bsp;   
DESCRIPTION<o:p></o:p>

       &n bsp;   &=
nbsp;       
""<o:p></o:p>

       &n bsp;   
::=3D {wlanBridgingSiteMapEntry 6}<o:p></o:p>

<o:p> </o:p>

   
wlanBridgingSiteMapSS     =
OBJECT-TYPE<o:p></o:p>

       &n bsp;   
SYNTAX       &n bsp;    =
OCTET
STRING (SIZE(1..30))<o:p></o:p>

       &n bsp;   
MAX-ACCESS        =
read-only<o:p></o:p>

       &n bsp;   
STATUS       &n bsp;   
current<o:p></o:p>

       &n bsp;   
DESCRIPTION<o:p></o:p>

       &n bsp;   &=
nbsp;       
""<o:p></o:p>

       &n bsp;   
::=3D {wlanBridgingSiteMapEntry 7}<o:p></o:p>

<o:p> </o:p>

<o:p> </o:p>

---------Debug trace =
--------------------<o:p></o:p>

<o:p> </o:p>

trace: netsnmp_udp_recv(): snmpUDPDomain.c, =
128:<o:p></o:p>

netsnmp_udp: recvfrom fd 15 got 58 bytes =
(from
192.168.254.2)<o:p></o:p>

trace: _sess_process_packet(): snmp_api.c, =
4882:<o:p></o:p>

sess_process_packet: session 0x7bd30 fd 15 =
pkt
0x81000 length 58<o:p></o:p>

dumpx_recv:02 01 03 =
<o:p></o:p>

dumpv_recv:  Integer:   3 =
(0x03)<o:p></o:p>

trace: snmpv3_parse(): snmp_api.c, =
3381:<o:p></o:p>

dumph_recv: SNMPv3 =
Message<o:p></o:p>

trace: snmpv3_parse(): snmp_api.c, =
3396:<o:p></o:p>

dumph_recv:   SNMP Version =
Number<o:p></o:p>

dumpx_recv:    02 01 03 =
<o:p></o:p>

dumpv_recv:      =
Integer:     3
(0x03)<o:p></o:p>

trace: snmpv3_parse(): snmp_api.c, =
3412:<o:p></o:p>

dumph_recv:   =
msgGlobalData<o:p></o:p>

trace: snmpv3_parse(): snmp_api.c, =
3429:<o:p></o:p>

dumph_recv:     =
msgID<o:p></o:p>

dumpx_recv:      02 =
01 16 <o:p></o:p>

dumpv_recv:     &nb sp; 
Integer:   22 (0x16)<o:p></o:p>

trace: snmpv3_parse(): snmp_api.c, =
3461:<o:p></o:p>

dumph_recv:     =
msgMaxSize<o:p></o:p>

dumpx_recv:      02 =
03 00
FF F0 <o:p></o:p>

dumpv_recv:     &nb sp; 
Integer:   65520 (0xFFF0)<o:p></o:p>

trace: snmpv3_parse(): snmp_api.c, =
3499:<o:p></o:p>

snmpv3_parse: msgMaxSize 65520 =
received<o:p></o:p>

trace: snmpv3_parse(): snmp_api.c, =
3507:<o:p></o:p>

dumph_recv:     =
msgFlags<o:p></o:p>

dumpx_recv:      04 =
01 04 <o:p></o:p>

dumpv_recv:     &nb sp; 
String:    .<o:p></o:p>

trace: snmpv3_parse(): snmp_api.c, =
3525:<o:p></o:p>

dumph_recv:     =
msgSecurityModel<o:p></o:p>

dumpx_recv:      02 =
01 03 <o:p></o:p>

dumpv_recv:     &nb sp; 
Integer:   3 (0x03)<o:p></o:p>

trace: snmpv3_parse(): snmp_api.c, =
3599:<o:p></o:p>

dumph_recv:   SM =
msgSecurityParameters<o:p></o:p>

trace: usm_process_in_msg(): snmpusm.c, =
2299:<o:p></o:p>

usm: USM processing =
begun...<o:p></o:p>

trace: usm_parse_security_parameters(): =
snmpusm.c,
1868:<o:p></o:p>

dumph_recv:    
msgAuthoritativeEngineID<o:p></o:p>

dumpx_recv:      04 =
00 <o:p></o:p>

dumpv_recv:     &nb sp; 
String:    <o:p></o:p>

trace: usm_parse_security_parameters(): =
snmpusm.c,
1891:<o:p></o:p>

dumph_recv:     =
msgAuthoritativeEngineBoots<o:p></o:p>

dumpx_recv:      02 =
01 00 <o:p></o:p>

dumpv_recv:     &nb sp; 
Integer:   0 (0x00)<o:p></o:p>

trace: usm_parse_security_parameters(): =
snmpusm.c,
1915:<o:p></o:p>

dumph_recv:    
msgAuthoritativeEngineTime<o:p></o:p>

dumpx_recv:      02 =
01 00 <o:p></o:p>

dumpv_recv:     &nb sp; 
Integer:   0 (0x00)<o:p></o:p>

trace: usm_parse_security_parameters(): =
snmpusm.c,
1943:<o:p></o:p>

dumph_recv:     =
msgUserName<o:p></o:p>

dumpx_recv:      04 =
00 <o:p></o:p>

dumpv_recv:     &nb sp; 
String:    <o:p></o:p>

trace: usm_parse_security_parameters(): =
snmpusm.c,
1986:<o:p></o:p>

dumph_recv:    
msgAuthenticationParameters<o:p></o:p>

dumpx_recv:      04 =
00 <o:p></o:p>

dumpv_recv:     &nb sp; 
String:    <o:p></o:p>

trace: usm_parse_security_parameters(): =
snmpusm.c,
2015:<o:p></o:p>

dumph_recv:    
msgPrivacyParameters<o:p></o:p>

dumpx_recv:      04 =
00 <o:p></o:p>

dumpv_recv:     &nb sp; 
String:    <o:p></o:p>

trace: usm_process_in_msg(): snmpusm.c, =
2398:<o:p></o:p>

usm: Unknown Engine =
ID.<o:p></o:p>

trace: snmpv3_parse(): snmp_api.c, =
3629:<o:p></o:p>

dumph_recv:     =
ScopedPDU<o:p></o:p>

trace: snmpv3_scopedPDU_parse(): snmp_api.c, =
4377:<o:p></o:p>

dumph_recv:     &nb sp;
contextEngineID<o:p></o:p>

dumpx_recv:     &nb sp; 
04 00 <o:p></o:p>

dumpv_recv:     &nb sp;   
String:  <o:p></o:p>

trace: snmpv3_scopedPDU_parse(): snmp_api.c, =
4401:<o:p></o:p>

dumph_recv:     &nb sp;
contextName<o:p></o:p>

dumpx_recv:     &nb sp; 
04 00 <o:p></o:p>

dumpv_recv:     &nb sp;   
String:  <o:p></o:p>

trace: snmpv3_parse(): snmp_api.c, =
3637:<o:p></o:p>

dumph_recv:     &nb sp;
PDU-GET<o:p></o:p>

trace: snmp_pdu_parse(): snmp_api.c, =
4175:<o:p></o:p>

dumph_recv:     &nb sp;  
request_id<o:p></o:p>

dumpx_recv:     &nb sp;   
02 01 15 <o:p></o:p>

dumpv_recv:     &nb sp;   &n=
bsp; 
Integer:     21 (0x15)<o:p></o:p>

trace: snmp_pdu_parse(): snmp_api.c, =
4186:<o:p></o:p>

dumph_recv:     &nb sp;  
error status<o:p></o:p>

dumpx_recv:     &nb sp;   
02 01 00 <o:p></o:p>

dumpv_recv:     &nb sp;   &n=
bsp; 
Integer:     0 (0x00)<o:p></o:p>

trace: snmp_pdu_parse(): snmp_api.c, =
4197:<o:p></o:p></s