usmdhuserkeytable_data_get.c

snmp的源代码,已经在我的ubuntu下编译通过

/*
 * Note: this file originally auto-generated by mib2c using
 *       version : 1.18 $ of : mfd-data-get.m2c,v $ 
 *
 * $Id: usmDHUserKeyTable_data_get.c,v 1.7 2004/10/16 00:35:35 rstory Exp $
 */
/*
 * standard Net-SNMP includes 
 */
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>

#include <openssl/dh.h>

/*
 * include our parent header 
 */
#define NEED_USMDH_FUNCTIONS
#include "usmDHUserKeyTable.h"

DH             *
usmDHGetUserDHptr(struct usmUser *user, int for_auth_key)
{
    DH             *dh, *dh_params;
    void          **theptr;

    if (user == NULL)
        return NULL;

    if (for_auth_key == 1)
        theptr = &user->usmDHUserAuthKeyChange;
    else
        theptr = &user->usmDHUserPrivKeyChange;

    if (!*theptr) {
        /*
         * copy the system parameters to the local ones 
         */
        dh = DH_new();
        if (!dh)
            return NULL;
        dh_params = get_dh_params();
        if (!dh_params)
            return NULL;
        dh->g = BN_dup(dh_params->g);
        dh->p = BN_dup(dh_params->p);
        if (!dh->g || !dh->p)
            return NULL;
        DH_generate_key(dh);
        *theptr = dh;
    } else {
        dh = (DH *) * theptr;
    }
    return dh;
}

int
usmDHGetUserKeyChange(struct usmUser *user, int for_auth_key,
                      char **keyobj, size_t *keyobj_len)
{
    DH             *dh;

    dh = usmDHGetUserDHptr(user, for_auth_key);

    if (!dh) {
        snmp_log(LOG_ERR, "ack...  shouldn't get here: %x %d\n",
                 user, for_auth_key);
        return MFD_ERROR;
    }

    *keyobj_len = BN_num_bytes(dh->pub_key);
    *keyobj = malloc(*keyobj_len);
    BN_bn2bin(dh->pub_key, *keyobj);

    return MFD_SUCCESS;
}

/** @defgroup data_get data_get: Routines to get data
 *
 * TODO:230:M: Implement usmDHUserKeyTable get routines.
 * TODO:240:M: Implement usmDHUserKeyTable mapping routines (if any).
 *
 * These routine are used to get the value for individual objects. The
 * row context is passed, along with a pointer to the memory where the
 * value should be copied.
 *
 * @{
 */
/**********************************************************************
 **********************************************************************
 ***
 *** Table usmDHUserKeyTable
 ***
 **********************************************************************
 **********************************************************************/
/*
 * usmDHUserKeyTable is subid 2 of usmDHPublicObjects.
 * Its status is Current.
 * OID: .1.3.6.1.3.101.1.1.2, length: 9
 */

/*
 * ---------------------------------------------------------------------
 * * TODO:200:r: Implement usmDHUserKeyTable data context functions.
 */
/*
 * usmDHUserKeyTable_allocate_data
 *
 * Purpose: create new usmDHUserKeyTable_data.
 */
usmDHUserKeyTable_data *
usmDHUserKeyTable_allocate_data(void)
{
    /*
     * TODO:201:r: |-> allocate memory for the usmDHUserKeyTable data context.
     */
    usmDHUserKeyTable_data *rtn =
        SNMP_MALLOC_TYPEDEF(usmDHUserKeyTable_data);

    DEBUGMSGTL(("verbose:usmDHUserKeyTable:usmDHUserKeyTable_allocate_data", "called\n"));

    if (NULL == rtn) {
        snmp_log(LOG_ERR, "unable to malloc memory for new "
                 "usmDHUserKeyTable_data.\n");
    }
    /*
     * not real user, not in a list. mark for testing
     */
    rtn->next = (struct usmUser *) -1;
    rtn->prev = (struct usmUser *) -1;

    return rtn;
}                               /* usmDHUserKeyTable_allocate_data */

/*
 * usmDHUserKeyTable_release_data
 *
 * Purpose: release usmDHUserKeyTable data.
 */
void
usmDHUserKeyTable_release_data(usmDHUserKeyTable_data * data)
{
    struct usmUser *user = data;

    DEBUGMSGTL(("verbose:usmDHUserKeyTable:usmDHUserKeyTable_release_data",
                "called\n"));

    netsnmp_assert(user->next == (struct usmUser *) -1);
    netsnmp_assert(user->prev == (struct usmUser *) -1);

    /*
     * TODO:202:r: |-> release memory for the usmDHUserKeyTable data context.
     */
    if (user) {
        SNMP_FREE(user->authKey);
        SNMP_FREE(user->privKey);
    }

    free(data);
}                               /* usmDHUserKeyTable_release_data */



/**
 * set mib index(es)
 *
 * @param tbl_idx mib index structure
 *
 * @retval MFD_SUCCESS     : success.
 * @retval MFD_ERROR       : other error.
 *
 * @remark
 *  This convenience function is useful for setting all the MIB index
 *  components with a single function call. It is assume that the C values
 *  have already been mapped from their native/rawformat to the MIB format.
 */
int
usmDHUserKeyTable_indexes_set_tbl_idx(usmDHUserKeyTable_mib_index *
                                      tbl_idx,
                                      char *usmUserEngineID_val_ptr,
                                      size_t usmUserEngineID_val_ptr_len,
                                      char *usmUserName_val_ptr,
                                      size_t usmUserName_val_ptr_len)
{
    DEBUGMSGTL(("verbose:usmDHUserKeyTable:usmDHUserKeyTable_indexes_set_tbl_idx", "called\n"));

    /*
     * usmUserEngineID(1)/SnmpEngineID/ASN_OCTET_STR/char(char)//L/a/w/e/R/d/h 
     */
    tbl_idx->usmUserEngineID_len = sizeof(tbl_idx->usmUserEngineID);
    /** WARNING: this code might not work for struct usmUser */
    /*
     * make sure there is enough space for usmUserEngineID data
     */
    if ((NULL == tbl_idx->usmUserEngineID)
        || (tbl_idx->usmUserEngineID_len < usmUserEngineID_val_ptr_len)) {
        snmp_log(LOG_ERR, "not enough space for value\n");
        return MFD_ERROR;
    }
    tbl_idx->usmUserEngineID_len = usmUserEngineID_val_ptr_len;
    memcpy(tbl_idx->usmUserEngineID, usmUserEngineID_val_ptr,
           tbl_idx->usmUserEngineID_len *
           sizeof(tbl_idx->usmUserEngineID[0]));

    /*
     * usmUserName(2)/SnmpAdminString/ASN_OCTET_STR/char(char)//L/a/w/e/R/d/H 
     */
    tbl_idx->usmUserName_len = sizeof(tbl_idx->usmUserName);

    /** WARNING: this code might not work for struct usmUser */
    /*
     * make sure there is enough space for usmUserName data
     */
    if ((NULL == tbl_idx->usmUserName)
        || (tbl_idx->usmUserName_len < usmUserName_val_ptr_len)) {
        snmp_log(LOG_ERR, "not enough space for value\n");
        return MFD_ERROR;
    }
    tbl_idx->usmUserName_len = usmUserName_val_ptr_len;
    memcpy(tbl_idx->usmUserName, usmUserName_val_ptr,
           tbl_idx->usmUserName_len * sizeof(tbl_idx->usmUserName[0]));


    return MFD_SUCCESS;
}                               /* usmDHUserKeyTable_indexes_set_tbl_idx */

/**
 * @internal
 * set row context indexes
 *
 * @param reqreq_ctx the row context that needs updated indexes
 *
 * @retval MFD_SUCCESS     : success.
 * @retval MFD_ERROR       : other error.
 *
 * @remark
 *  This function sets the mib indexs, then updates the oid indexs
 *  from the mib index.
 */
int
usmDHUserKeyTable_indexes_set(usmDHUserKeyTable_rowreq_ctx * rowreq_ctx,
                              char *usmUserEngineID_val_ptr,
                              size_t usmUserEngineID_val_ptr_len,
                              char *usmUserName_val_ptr,
                              size_t usmUserName_val_ptr_len)
{
    DEBUGMSGTL(("verbose:usmDHUserKeyTable:usmDHUserKeyTable_indexes_set",
                "called\n"));

    if (MFD_SUCCESS !=
        usmDHUserKeyTable_indexes_set_tbl_idx(&rowreq_ctx->tbl_idx,
                                              usmUserEngineID_val_ptr,
                                              usmUserEngineID_val_ptr_len,
                                              usmUserName_val_ptr,
                                              usmUserName_val_ptr_len))
        return MFD_ERROR;

    /*
     * convert mib index to oid index
     */
    rowreq_ctx->oid_idx.len = sizeof(rowreq_ctx->oid_tmp) / sizeof(oid);
    if (0 != usmDHUserKeyTable_index_to_oid(&rowreq_ctx->oid_idx,
                                            &rowreq_ctx->tbl_idx)) {
        return MFD_ERROR;
    }

    return MFD_SUCCESS;
}                               /* usmDHUserKeyTable_indexes_set */


/*---------------------------------------------------------------------
 * SNMP-USM-DH-OBJECTS-MIB::usmDHUserKeyEntry.usmDHUserAuthKeyChange
 * usmDHUserAuthKeyChange is subid 1 of usmDHUserKeyEntry.
 * Its status is Current, and its access level is Create.
 * OID: .1.3.6.1.3.101.1.1.2.1.1
 * Description:
The object used to change any given user's Authentication Key
    using a Diffie-Hellman key exchange.

    The right-most n bits of the shared secret 'sk', where 'n' is the
    number of bits required for the protocol defined by
    usmUserAuthProtocol, are installed as the operational
    authentication key for this row after a successful SET.
 *
 * Attributes:
 *   accessible 1     isscalar 0     enums  0      hasdefval 0
 *   readable   1     iscolumn 1     ranges 0      hashint   0
 *   settable   1
 *
 *
 * Its syntax is DHKeyChange (based on perltype OCTETSTR)
 * The net-snmp type is ASN_OCTET_STR. The C type decl is char (char)
 * This data type requires a length.  (Max )
 */
/**
 * Extract the current value of the usmDHUserAuthKeyChange data.
 *
 * Set a value using the data context for the row.
 *
 * @param rowreq_ctx
 *        Pointer to the row request context.
 * @param usmDHUserAuthKeyChange_val_ptr_ptr
 *        Pointer to storage for a char variable
 * @param usmDHUserAuthKeyChange_val_ptr_len_ptr
 *        Pointer to a size_t. On entry, it will contain the size (in bytes)
 *        pointed to by usmDHUserAuthKeyChange.