usmuser.c

snmp的源代码,已经在我的ubuntu下编译通过

        }
        return NULL;

    case USMUSERCLONEFROM:
        *write_method = write_usmUserCloneFrom;
        if (uptr) {
            objid[0] = 0;       /* "When this object is read, the ZeroDotZero OID */
            objid[1] = 0;       /*  is returned." */
            *var_len = sizeof(oid) * 2;
            return (unsigned char *) objid;
        }
        return NULL;

    case USMUSERAUTHPROTOCOL:
        *write_method = write_usmUserAuthProtocol;
        if (uptr) {
            *var_len = uptr->authProtocolLen * sizeof(oid);
            return (u_char *) uptr->authProtocol;
        }
        return NULL;

    case USMUSERAUTHKEYCHANGE:
    case USMUSEROWNAUTHKEYCHANGE:
        /*
         * we treat these the same, and let the calling module
         * distinguish between them 
         */
        *write_method = write_usmUserAuthKeyChange;
        if (uptr) {
            *string = 0;        /* always return a NULL string */
            *var_len = 0;
            return string;
        }
        return NULL;

    case USMUSERPRIVPROTOCOL:
        *write_method = write_usmUserPrivProtocol;
        if (uptr) {
            *var_len = uptr->privProtocolLen * sizeof(oid);
            return (u_char *) uptr->privProtocol;
        }
        return NULL;

    case USMUSERPRIVKEYCHANGE:
    case USMUSEROWNPRIVKEYCHANGE:
        /*
         * we treat these the same, and let the calling module
         * distinguish between them 
         */
        *write_method = write_usmUserPrivKeyChange;
        if (uptr) {
            *string = 0;        /* always return a NULL string */
            *var_len = 0;
            return string;
        }
        return NULL;

    case USMUSERPUBLIC:
        *write_method = write_usmUserPublic;
        if (uptr) {
            if (uptr->userPublicString) {
                *var_len = strlen((char *) uptr->userPublicString);
                return uptr->userPublicString;
            }
            *string = 0;
            *var_len = 0;       /* return an empty string if the public
                                 * string hasn't been defined yet */
            return string;
        }
        return NULL;

    case USMUSERSTORAGETYPE:
        *write_method = write_usmUserStorageType;
        if (uptr) {
            long_ret = uptr->userStorageType;
            return (unsigned char *) &long_ret;
        }
        return NULL;

    case USMUSERSTATUS:
        *write_method = write_usmUserStatus;
        if (uptr) {
            long_ret = uptr->userStatus;
            return (unsigned char *) &long_ret;
        }
        return NULL;

    default:
        DEBUGMSGTL(("snmpd", "unknown sub-id %d in var_usmUser\n",
                    vp->magic));
    }
    return 0;

}                               /* end var_usmUser() */

/*
 * write_usmUserSpinLock(): called when a set is performed on the
 * usmUserSpinLock object 
 */
int
write_usmUserSpinLock(int action,
                      u_char * var_val,
                      u_char var_val_type,
                      size_t var_val_len,
                      u_char * statP, oid * name, size_t name_len)
{
    /*
     * variables we may use later 
     */
    static long     long_ret;

    if (var_val_type != ASN_INTEGER) {
        DEBUGMSGTL(("usmUser",
                    "write to usmUserSpinLock not ASN_INTEGER\n"));
        return SNMP_ERR_WRONGTYPE;
    }
    if (var_val_len > sizeof(long_ret)) {
        DEBUGMSGTL(("usmUser", "write to usmUserSpinLock: bad length\n"));
        return SNMP_ERR_WRONGLENGTH;
    }
    long_ret = *((long *) var_val);
    if (long_ret != (long) usmUserSpinLock)
        return SNMP_ERR_INCONSISTENTVALUE;
    if (action == COMMIT) {
        if (usmUserSpinLock == 2147483647)
            usmUserSpinLock = 0;
        else
            usmUserSpinLock++;
    }
    return SNMP_ERR_NOERROR;
}                               /* end write_usmUserSpinLock() */

/*******************************************************************-o-******
 * write_usmUserCloneFrom
 *
 * Parameters:
 *	 action
 *	*var_val
 *	 var_val_type
 *	 var_val_len
 *	*statP		(UNUSED)
 *	*name		OID of user to clone from.
 *	 name_len
 *      
 * Returns:
 *	SNMP_ERR_NOERROR		On success  -OR-  If user exists
 *					  and has already been cloned.
 *	SNMP_ERR_GENERR			Local function call failures.
 *	SNMP_ERR_INCONSISTENTNAME	'name' does not exist in user list
 *					  -OR-  user to clone from != RS_ACTIVE.
 *	SNMP_ERR_WRONGLENGTH		OID length > than local buffer size.
 *	SNMP_ERR_WRONGTYPE		ASN_OBJECT_ID is wrong.
 *
 *
 * XXX:  should handle action=UNDO's.
 */
int
write_usmUserCloneFrom(int action,
                       u_char * var_val,
                       u_char var_val_type,
                       size_t var_val_len,
                       u_char * statP, oid * name, size_t name_len)
{
    struct usmUser *uptr, *cloneFrom;

    if (action == RESERVE1) {
        if (var_val_type != ASN_OBJECT_ID) {
            DEBUGMSGTL(("usmUser",
                        "write to usmUserCloneFrom not ASN_OBJECT_ID\n"));
            return SNMP_ERR_WRONGTYPE;
        }
        if (var_val_len > USM_LENGTH_OID_MAX * sizeof(oid) ||
            var_val_len % sizeof(oid) != 0) {
            DEBUGMSGTL(("usmUser",
                        "write to usmUserCloneFrom: bad length\n"));
            return SNMP_ERR_WRONGLENGTH;
        }
    } else if (action == RESERVE2) {
        if ((uptr = usm_parse_user(name, name_len)) == NULL) {
            /*
             * We don't allow creations here.  
             */
            return SNMP_ERR_INCONSISTENTNAME;
        }

        /*
         * Has the user already been cloned?  If so, writes to this variable
         * are defined to have no effect and to produce no error.  
         */
        if (uptr->cloneFrom != NULL) {
            return SNMP_ERR_NOERROR;
        }

        cloneFrom =
            usm_parse_user((oid *) var_val, var_val_len / sizeof(oid));
        if (cloneFrom == NULL || cloneFrom->userStatus != SNMP_ROW_ACTIVE) {
            return SNMP_ERR_INCONSISTENTNAME;
        }
        uptr->cloneFrom = snmp_duplicate_objid((oid *) var_val,
                                               var_val_len / sizeof(oid));
        usm_cloneFrom_user(cloneFrom, uptr);

        if (usmStatusCheck(uptr) && uptr->userStatus == SNMP_ROW_NOTREADY) {
            uptr->userStatus = SNMP_ROW_NOTINSERVICE;
        }
    }

    return SNMP_ERR_NOERROR;
}

/*******************************************************************-o-******
 * write_usmUserAuthProtocol
 *
 * Parameters:
 *	 action
 *	*var_val	OID of auth transform to set.
 *	 var_val_type
 *	 var_val_len
 *	*statP
 *	*name		OID of user upon which to perform set operation.
 *	 name_len
 *      
 * Returns:
 *	SNMP_ERR_NOERROR		On success.
 *	SNMP_ERR_GENERR
 *	SNMP_ERR_INCONSISTENTVALUE
 *	SNMP_ERR_NOSUCHNAME
 *	SNMP_ERR_WRONGLENGTH
 *	SNMP_ERR_WRONGTYPE
 */
int
write_usmUserAuthProtocol(int action,
                          u_char * var_val,
                          u_char var_val_type,
                          size_t var_val_len,
                          u_char * statP, oid * name, size_t name_len)
{
    static oid     *optr;
    static size_t   olen;
    static int      resetOnFail;
    struct usmUser *uptr;

    if (action == RESERVE1) {
        resetOnFail = 0;
        if (var_val_type != ASN_OBJECT_ID) {
            DEBUGMSGTL(("usmUser",
                        "write to usmUserAuthProtocol not ASN_OBJECT_ID\n"));
            return SNMP_ERR_WRONGTYPE;
        }
        if (var_val_len > USM_LENGTH_OID_MAX * sizeof(oid) ||
            var_val_len % sizeof(oid) != 0) {
            DEBUGMSGTL(("usmUser",
                        "write to usmUserAuthProtocol: bad length\n"));
            return SNMP_ERR_WRONGLENGTH;
        }
    } else if (action == RESERVE2) {
        if ((uptr = usm_parse_user(name, name_len)) == NULL) {
            return SNMP_ERR_INCONSISTENTNAME;
        }

        if (uptr->userStatus == RS_ACTIVE
            || uptr->userStatus == RS_NOTREADY
            || uptr->userStatus == RS_NOTINSERVICE) {
            /*
             * The authProtocol is already set.  It is only legal to CHANGE it
             * to usmNoAuthProtocol...  
             */
            if (snmp_oid_compare
                ((oid *) var_val, var_val_len / sizeof(oid),
                 usmNoAuthProtocol,
                 sizeof(usmNoAuthProtocol) / sizeof(oid)) == 0) {
                /*
                 * ... and then only if the privProtocol is equal to
                 * usmNoPrivProtocol.  
                 */
                if (snmp_oid_compare
                    (uptr->privProtocol, uptr->privProtocolLen,
                     usmNoPrivProtocol,
                     sizeof(usmNoPrivProtocol) / sizeof(oid)) != 0) {
                    return SNMP_ERR_INCONSISTENTVALUE;
                }
                optr = uptr->authProtocol;
                olen = uptr->authProtocolLen;
                resetOnFail = 1;
                uptr->authProtocol = snmp_duplicate_objid((oid *) var_val,
                                                          var_val_len /
                                                          sizeof(oid));
                if (uptr->authProtocol == NULL) {
                    return SNMP_ERR_RESOURCEUNAVAILABLE;
                }
                uptr->authProtocolLen = var_val_len / sizeof(oid);
            } else
                if (snmp_oid_compare
                    ((oid *) var_val, var_val_len / sizeof(oid),
                     uptr->authProtocol, uptr->authProtocolLen) == 0) {
                /*
                 * But it's also okay to set it to the same thing as it
                 * currently is.  
                 */
                return SNMP_ERR_NOERROR;
            } else {
                return SNMP_ERR_INCONSISTENTVALUE;
            }
        } else {
            /*
             * This row is under creation.  It's okay to set
             * usmUserAuthProtocol to any valid authProtocol but it will be
             * overwritten when usmUserCloneFrom is set (so don't write it if
             * that has already been set).  
             */

            if (snmp_oid_compare
                ((oid *) var_val, var_val_len / sizeof(oid),
                 usmNoAuthProtocol,
                 sizeof(usmNoAuthProtocol) / sizeof(oid)) == 0
#ifndef DISABLE_MD5
                || snmp_oid_compare((oid *) var_val,
                                    var_val_len / sizeof(oid),
                                    usmHMACMD5AuthProtocol,
                                    sizeof(usmHMACMD5AuthProtocol) /
                                    sizeof(oid)) == 0
#endif
                || snmp_oid_compare((oid *) var_val,
                                    var_val_len / sizeof(oid),
                                    usmHMACSHA1AuthProtocol,
                                    sizeof(usmHMACSHA1AuthProtocol) /
                                    sizeof(oid)) == 0) {
                if (uptr->cloneFrom != NULL) {
                    optr = uptr->authProtocol;
                    olen = uptr->authProtocolLen;
                    resetOnFail = 1;
                    uptr->authProtocol =
                        snmp_duplicate_objid((oid *) var_val,
                                             var_val_len / sizeof(oid));
                    if (uptr->authProtocol == NULL) {
                        return SNMP_ERR_RESOURCEUNAVAILABLE;
                    }
                    uptr->authProtocolLen = var_val_len / sizeof(oid);
                }
            } else {
                /*
                 * Unknown authentication protocol.  
                 */
                return SNMP_ERR_WRONGVALUE;
            }
        }
    } else if (action == COMMIT) {
        SNMP_FREE(optr);
        optr = NULL;
    } else if (action == FREE || action == UNDO) {
        if ((uptr = usm_parse_user(name, name_len)) != NULL) {
            if (resetOnFail) {
                SNMP_FREE(uptr->authProtocol);
                uptr->authProtocol = optr;
                uptr->authProtocolLen = olen;
            }
        }
    }
    return SNMP_ERR_NOERROR;
}                               /* end write_usmUserAuthProtocol() */

/*******************************************************************-o-******
 * write_usmUserAuthKeyChange
 *
 * Parameters:
 *	 action		
 *	*var_val	Octet string representing new KeyChange value.
 *	 var_val_type
 *	 var_val_len
 *	*statP		(UNUSED)
 *	*name		OID of user upon which to perform set operation.
 *	 name_len
 *      
 * Returns:
 *	SNMP_ERR_NOERR		Success.
 *	SNMP_ERR_WRONGTYPE	
 *	SNMP_ERR_WRONGLENGTH	
 *	SNMP_ERR_NOSUCHNAME	
 *	SNMP_ERR_GENERR
 *
 * Note: This function handles both the usmUserAuthKeyChange and
 *       usmUserOwnAuthKeyChange objects.  We are not passed the name
 *       of the user requseting the keychange, so we leave this to the
 *       calling module to verify when and if we should be called.  To
 *       change this would require a change in the mib module API to
 *       pass in the securityName requesting the change.
 *
 * XXX:  should handle action=UNDO's.
 */
int
write_usmUserAuthKeyChange(int action,
                           u_char * var_val,
                           u_char var_val_type,
                           size_t var_val_len,
                           u_char * statP, oid * name, size_t name_len)
{