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"Benoît Lemaire" <[email protected]>
Newsgroups gmane.network.net-snmp.user
Message-ID <[email protected]> 
2007/3/5, [email protected] <
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> Today's Topics:
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>   1. linux core net-snmp management (Iacopo Masi)
>   2. Problem with vp->magic (Shuaib Siddiqui)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 5 Mar 2007 01:12:24 +0100
> From: Iacopo Masi <[email protected]>
> Subject: linux core net-snmp management
> To: [email protected]
> Cc: [email protected]
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset="us-ascii"
>
> Hello everybody,
> we are two Italian students interested in net management, Iacopo and
> Marco.
>
> I'm wondering about how can I use net-snmp agent to create the agent layer
> dealing with a Snapgear Linux emebedded system.
>
> In particular I would like to know how to manage this parts of linux
> system:
>
>        - LAN interfaces
>        - WLAN interfaces
>        - Static and Dynamic Routing
>        - Firewalling
>        - ....
>
> For example, let's take the Firewall example, that is covered in linux by
> iptables and netfilter. I would create a snmp agent that could get the
> list
> of iptables entries for all chains and all tables. And by the way the
> agent
> could receive a snmpset command to add some new rules.
>
> How do I create this?
> [1]Should I write a MIB modules for each service (firewall etc..) and then
> with MIB for Dummies tutorial, generate the code for the subagent and
> coding
> it inside.
> Or
> [2] Should I use the option of snmp to run particle scripts on the agent
> platform and get/set the value I need?
>
> In other way, Should I deal with "/proc/net/dev" or with "ifconfig" for
> the
> example of teh LAN interfaces?
>
> Do you have some good guide about [1] and [2], premised that I have
> already
> read the wiki tutorial?
>
> Many thanks.
>
> --
> Iacopo Masi
> Marco Meoni
> www.iacopomasi.net
> www.marcomeoni.net
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> ------------------------------
>
> Message: 2
> Date: Mon, 5 Mar 2007 10:51:26 +0100
> From: "Shuaib Siddiqui" <[email protected]>
> Subject: Problem with vp->magic
> To: [email protected]
> Message-ID:
>        <[email protected]>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi,
>
> I have extended the UCD-SNMP agent with a MIB module. The vp->magic
> appears
> to be 1 less than what it should be, which causes the value of object
> above
> it to be returned. Following is Code of the variable structure, definition
> of the magic numbers from the header file and in the end i'll describe the
> unusual behavior.
>
> struct variable7 sPlc_variables[] = {
> { _infoHardwareVersion,     ASN_OCTET_STR,  RONLY,  var_alpsPlc,    2,
> {1,1} },
> { _infoFirmwareVersion,     ASN_OCTET_STR,  RONLY,  var_alpsPlc,    2,
> {1,2} },
> { _infoBuildDate,   ASN_OCTET_STR,  RONLY,  var_alpsPlc,    2,      {1,3}
> },
> { _infoFlashParamsNotSaved, ASN_INTEGER,    RONLY,  var_alpsPlc,    2,
> {1,4} },
> { _infoFlashChanged,        ASN_INTEGER,    RONLY,  var_alpsPlc,    2,
> {1,5} },
> { _nodeType,        ASN_INTEGER,    RWRITE,
> var_alpsPlc,    3,      {2,1,1}
> },
> { _freqBand,        ASN_INTEGER,    RWRITE,
> var_alpsPlc,    3,      {2,1,2}
> },
> { _customFreqBandIdx,       ASN_INTEGER,    RONLY,
> var_alpscustomFreqBandTable,    5,      {2,1,3,1,1} },
> { _customFreqBandCenterFreq,        ASN_INTEGER,    RWRITE,
> var_alpscustomFreqBandTable,    5,      {2,1,3,1,2} },
> { _customFreqBandBandwidth, ASN_INTEGER,    RWRITE,
> var_alpscustomFreqBandTable,    5,      {2,1,3,1,3} },
> { _customFreqBandRowStatus, ASN_INTEGER,    RWRITE,
> var_alpscustomFreqBandTable,    5,      {2,1,3,1,4} },
> { _preferredBandTimeout,    ASN_INTEGER,    RWRITE, var_alpsPlc,    3,
> {2,1,4} },
> { _powerMask30,     ASN_INTEGER,    RWRITE,
> var_alpsPlc,    3,      {2,1,5}
> },
> { _powerMaskIARU,   ASN_INTEGER,    RWRITE,
> var_alpsPlc,    3,      {2,1,6}
> },
> { _agcTxEnable,     ASN_INTEGER,    RWRITE, var_alpsPlc,    4,
> {2,1,7,1} },
> { _agcRxEnable,     ASN_INTEGER,    RWRITE, var_alpsPlc,    4,
> {2,1,7,2} },
> { _agcTxGain,       ASN_INTEGER,    RWRITE, var_alpsPlc,    4,
> {2,1,7,3} },
> { _agcRxGain,       ASN_INTEGER,    RWRITE, var_alpsPlc,    4,
> {2,1,7,4} },
> { _masterSelectionEnable,   ASN_INTEGER,    RWRITE, var_alpsPlc,    4,
> {2,1,8,1} },
> { _masterSelectionCriteria, ASN_INTEGER,    RWRITE, var_alpsPlc,    4,
> {2,1,8,2} },
> { _masterSelectionNumOfHops,        ASN_INTEGER,    RWRITE, var_alpsPlc,
> 4,      {2,1,8,3} },
> { _masterSelectionFixed,    ASN_OCTET_STR,  RWRITE, var_alpsPlc,    4,
> {2,1,8,4} },
> { _firmwareUpgradeURL,      ASN_OCTET_STR,  RWRITE, var_alpsPlc,    4,
> {2,2,1,1} },
> { _configFileDownloadURL,   ASN_OCTET_STR,  RWRITE, var_alpsPlc,    4,
> {2,2,1,2} },
> { _configFileUploadURL,     ASN_OCTET_STR,  RWRITE, var_alpsPlc,    4,
> {2,2,1,3} },
> { _saveParamsInFlash,       ASN_INTEGER,    RWRITE, var_alpsPlc,    4,
> {2,2,2,1} },
> { _restoreFactoryDefaults,  ASN_INTEGER,    RWRITE, var_alpsPlc,    4,
> {2,2,2,2} },
> { _upgradeFirmware, ASN_INTEGER,    RWRITE, var_alpsPlc,    4,
> {2,2,2,3} },
> { _upgradeCongFile, ASN_INTEGER,    RWRITE, var_alpsPlc,    4,
> {2,2,2,4} },
> { _deviceReboot,    ASN_INTEGER,    RWRITE, var_alpsPlc,    4,
> {2,2,2,5} },
> { _vlanEnabled,     ASN_INTEGER,    RWRITE,
> var_alpsPlc,    3,      {2,3,1}
> },
> { _vlanType,        ASN_INTEGER,    RWRITE,
> var_alpsPlc,    3,      {2,3,2}
> },
> { _vlanDataID,      ASN_INTEGER,    RWRITE,
> var_alpsPlc,    3,      {2,3,3}
> },
> { _vlanMgmtID,      ASN_INTEGER,    RWRITE,
> var_alpsPlc,    3,      {2,3,4}
> },
> { _vlanDataPriority,        ASN_INTEGER,    RWRITE, var_alpsPlc,    3,
> {2,3,5} },
> { _vlanMgmtPriority,        ASN_INTEGER,    RWRITE, var_alpsPlc,    3,
> {2,3,6} },
> { _qosEnabled,      ASN_INTEGER,    RWRITE,
> var_alpsPlc,    3,      {2,4,1}
> },
> { _qosClass,        ASN_INTEGER,    RWRITE,
> var_alpsPlc,    3,      {2,4,2}
> },
> { _qosUplinkLimit,  ASN_INTEGER,    RWRITE,
> var_alpsPlc,    3,      {2,4,3}
> },
> { _qosDownlinkLimit,        ASN_INTEGER,    RWRITE, var_alpsPlc,    3,
> {2,4,4} },
> { _aclAdminIdx,     ASN_INTEGER,    RONLY,  var_alpsaclAdminTable,  6,
> {2,5,1,1,1,1} },
> { _aclAdminHost,    ASN_OCTET_STR,  RWRITE, var_alpsaclAdminTable,  6,
> {2,5,1,1,1,2} },
> { _aclAdminRowStatus,       ASN_INTEGER,    RWRITE, var_alpsaclAdminTable,
> 6,      {2,5,1,1,1,3} }
> };
>
> #define _infoHardwareVersion                                1
> #define _infoFirmwareVersion                                2
> #define _infoBuildDate                                      3
> #define _infoFlashParamsNotSaved                            4
> #define _infoFlashChanged                                   5
> #define _nodeType                                           6
> #define _freqBand                                           7
> #define _preferredBandTimeout                               12
> #define _powerMask30                                        13
> #define _powerMaskIARU                                      14
> #define _agcTxEnable                                        15
> #define _agcRxEnable                                        16
> #define _agcTxGain                                          17
> #define _agcRxGain                                          18
> #define _masterSelectionEnable                              19
> #define _masterSelectionCriteria                            20
> #define _masterSelectionNumOfHops                           21
> #define _masterSelectionFixed                               22
> #define _firmwareUpgradeURL                                 23
> #define _configFileDownloadURL                              24
> #define _configFileUploadURL                                25
> #define _saveParamsInFlash                                  26
> #define _restoreFactoryDefaults                             27
> #define _upgradeFirmware                                    28
> #define _upgradeCongFile                                    29
> #define _deviceReboot                                       30
> #define _vlanEnabled                                        31
> #define _vlanType                                           32
> #define _vlanDataID                                         33
> #define _vlanMgmtID                                         34
> #define _vlanDataPriority                                   35
> #define _vlanMgmtPriority                                   36
> #define _qosEnabled                                         37
> #define _qosClass                                           38
> #define _qosUplinkLimit                                     39
> #define _qosDownlinkLimit                                   40
>
> #define CONF_customFreqBandIdx                                  1
> #define CONF_customFreqBandCenterFreq                           2
> #define CONF_customFreqBandBandwidth                            3
> #define CONF_customFreqBandRowStatus                            4
>
> #define CONF_aclAdminIdx                                       1
> #define CONF_aclAdminHost                                      2
> #define CONF_aclAdminRowStatus                                 3
>
> The location where this module is registered within the MIB tree is:  oid
> sPlc_variables_oid[] = { 1,3,6,1,4,1,188,11,10 };
> If I print the value of vp->magic from the method: search_subtree_vars()
> in
> the File: snmp_vars.c, will return 29 for the Object deviceReboot, whose
> actual magic number is 30. Its similar with all the objects above the
> Object
> deviceReboot but it returns correct value for the Objects that are below
> it.
> I also printed the vp->magic from within my variable handling routine but
> the behavior is the same. Does anyone has an idea why this is happening?
> Thank you for your time!
>
> Shuaib
> --
> MSc in Communication Systems
> I&C Faculty
> EPFL
> Switzerland
> Home page: http://shuaibe.googlepages.com/
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