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SNMP上手攻略

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=D4=CB=D0=D0=B5=C4Demo=A1=A3</P>
            =
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            <P =
align=3Dleft>=D2=D4=CF=C2=CA=C7SNMPUTIL.C=CE=C4=BC=FE=A3=BA</P><PRE>/*++ =
BUILD Version: 0001    // Increment this if a change has global effects

  Copyright (c) 1991-1995  Microsoft Corporation
 =20
    Module Name:
   =20
      snmputil.c
     =20
        Abstract:
       =20
          Sample SNMP Management API usage for Windows NT.
         =20
            This file is an example of how to code management =
applications using
            the SNMP Management API for Windows NT.  It is similar in =
operation to
            the other commonly available SNMP command line utilities.
           =20
              Extensive comments have been included to describe its =
structure and
              operation.  See also "Microsoft Windows/NT SNMP =
Programmer's Reference".
             =20
                Created:
               =20
                  28-Jun-1991
                 =20
                    Revision History:
                   =20
--*/


static char *vcsid =3D "@(#) $Logfile:   =
N:/agent/mgmtapi/vcs/snmputil.c_v  $ $Revision:   1.5  $";


// General notes:
//   Microsoft's SNMP Management API for Windows NT is implemented as a =
DLL
// that is linked with the developer's code.  These APIs (examples =
follow in
// this file) allow the developer's code to generate SNMP queries and =
receive
// SNMP traps.  A simple MIB compiler and related APIs are also =
available to
// allow conversions between OBJECT IDENTIFIERS and OBJECT DESCRIPTORS.


// Necessary includes.

#include &lt;windows.h&gt;

#include &lt;stdio.h&gt;
#include &lt;string.h&gt;
#include &lt;malloc.h&gt;

#include &lt;snmp.h&gt;
#include &lt;mgmtapi.h&gt;


// Constants used in this example.

#define GET     1
#define GETNEXT 2
#define WALK    3
#define TRAP    4

#define TIMEOUT 6000 /* milliseconds */
#define RETRIES 3


// Main program.

INT _CRTAPI1 main(
                  IN int  argumentCount,
                  IN char *argumentVector[])
                 =20
{
    INT                operation;
    LPSTR              agent;
    LPSTR              community;
    RFC1157VarBindList variableBindings;
    LPSNMP_MGR_SESSION session;
   =20
    INT        timeout =3D TIMEOUT;
    INT        retries =3D RETRIES;
   =20
    BYTE       requestType;
    AsnInteger errorStatus;
    AsnInteger errorIndex;
    char        *chkPtr =3D NULL;
   =20
   =20
    // Parse command line arguments to determine requested operation.
   =20
    // Verify number of arguments...
    if      (argumentCount &lt; 5 &amp;&amp; argumentCount !=3D 2)
    {
        printf("Error:  Incorrect number of arguments specified.\n");
        printf(
            "\nusage:  snmputil [get|getnext|walk] agent community oid =
[oid ...]\n");
        printf(
            "        snmputil trap\n");
       =20
        return 1;
    }
   =20
    // Get/verify operation...
    argumentVector++;
    argumentCount--;
    if      (!strcmp(*argumentVector, "get"))
        operation =3D GET;
    else if (!strcmp(*argumentVector, "getnext"))
        operation =3D GETNEXT;
    else if (!strcmp(*argumentVector, "walk"))
        operation =3D WALK;
    else if (!strcmp(*argumentVector, "trap"))
        operation =3D TRAP;
    else
    {
        printf("Error:  Invalid operation, '%s', specified.\n",
            *argumentVector);
       =20
        return 1;
    }
   =20
    if (operation !=3D TRAP)
    {
        if (argumentCount &lt; 4)
        {
            printf("Error:  Incorrect number of arguments =
specified.\n");
            printf(
                "\nusage:  snmputil [get|getnext|walk] agent community =
oid [oid ...]\n");
            printf(
                "        snmputil trap\n");
           =20
            return 1;
        }
       =20
        // Get agent address...
        argumentVector++;
        argumentCount--;
        agent =3D (LPSTR)SNMP_malloc(strlen(*argumentVector) + 1);
        strcpy(agent, *argumentVector);
       =20
        // Get agent community...
        argumentVector++;
        argumentCount--;
        community =3D (LPSTR)SNMP_malloc(strlen(*argumentVector) + 1);
        strcpy(community, *argumentVector);
       =20
        // Get oid's...
        variableBindings.list =3D NULL;
        variableBindings.len =3D 0;
       =20
        while(--argumentCount)
        {
            AsnObjectIdentifier reqObject;
           =20
            argumentVector++;
           =20
            // Convert the string representation to an internal =
representation.
            if (!SnmpMgrStrToOid(*argumentVector, &amp;reqObject))
            {
                printf("Error: Invalid oid, %s, specified.\n", =
*argumentVector);
               =20
                return 1;
            }
            else
            {
                // Since sucessfull, add to the variable bindings list.
                variableBindings.len++;
                if ((variableBindings.list =3D (RFC1157VarBind =
*)SNMP_realloc(
                    variableBindings.list, sizeof(RFC1157VarBind) *
                    variableBindings.len)) =3D=3D NULL)
                {
                    printf("Error: Error allocating oid, %s.\n",
                        *argumentVector);
                   =20
                    return 1;
                }
               =20
                variableBindings.list[variableBindings.len - 1].name =3D
                    reqObject; // NOTE!  structure copy
                variableBindings.list[variableBindings.len - =
1].value.asnType =3D
                    ASN_NULL;
            }
        } // end while()
       =20
        // Make sure only one variable binding was specified if =
operation
        // is WALK.
        if (operation =3D=3D WALK &amp;&amp; variableBindings.len !=3D =
1)
        {
            printf("Error: Multiple oids specified for WALK.\n");
           =20
            return 1;
        }
       =20
       =20
        // Establish a SNMP session to communicate with the remote =
agent.  The
        // community, communications timeout, and communications retry =
count
        // for the session are also required.