usmuser.c

snmp的源代码,已经在我的ubuntu下编译通过

}                               /* end write_usmUserPublic() */

int
write_usmUserStorageType(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)
{
    long            long_ret = *((long *) var_val);
    static long     oldValue;
    struct usmUser *uptr;
    static int      resetOnFail;

    if (action == RESERVE1) {
        resetOnFail = 0;
        if (var_val_type != ASN_INTEGER) {
            DEBUGMSGTL(("usmUser",
                        "write to usmUserStorageType not ASN_INTEGER\n"));
            return SNMP_ERR_WRONGTYPE;
        }
        if (var_val_len != sizeof(long)) {
            DEBUGMSGTL(("usmUser",
                        "write to usmUserStorageType: bad length\n"));
            return SNMP_ERR_WRONGLENGTH;
        }
        if (long_ret < 1 || long_ret > 5) {
            return SNMP_ERR_WRONGVALUE;
        }
    } else if (action == RESERVE2) {
        if ((uptr = usm_parse_user(name, name_len)) == NULL) {
            return SNMP_ERR_INCONSISTENTNAME;
        }
        if ((long_ret == ST_VOLATILE || long_ret == ST_NONVOLATILE) &&
            (uptr->userStorageType == ST_VOLATILE ||
             uptr->userStorageType == ST_NONVOLATILE)) {
            oldValue = uptr->userStorageType;
            uptr->userStorageType = long_ret;
            resetOnFail = 1;
        } else {
            /*
             * From RFC2574:
             * 
             * "Note that any user who employs authentication or privacy must
             * allow its secret(s) to be updated and thus cannot be 'readOnly'.
             * 
             * If an initial set operation tries to set the value to 'readOnly'
             * for a user who employs authentication or privacy, then an
             * 'inconsistentValue' error must be returned.  Note that if the
             * value has been previously set (implicit or explicit) to any
             * value, then the rules as defined in the StorageType Textual
             * Convention apply.  
             */
            DEBUGMSGTL(("usmUser",
                        "long_ret %d uptr->st %d uptr->status %d\n",
                        long_ret, uptr->userStorageType,
                        uptr->userStatus));

            if (long_ret == ST_READONLY &&
                uptr->userStorageType != ST_READONLY &&
                (uptr->userStatus == RS_ACTIVE ||
                 uptr->userStatus == RS_NOTINSERVICE)) {
                return SNMP_ERR_WRONGVALUE;
            } else if (long_ret == ST_READONLY &&
                       (snmp_oid_compare
                        (uptr->privProtocol, uptr->privProtocolLen,
                         usmNoPrivProtocol,
                         sizeof(usmNoPrivProtocol) / sizeof(oid)) != 0
                        || snmp_oid_compare(uptr->authProtocol,
                                            uptr->authProtocolLen,
                                            usmNoAuthProtocol,
                                            sizeof(usmNoAuthProtocol) /
                                            sizeof(oid)) != 0)) {
                return SNMP_ERR_INCONSISTENTVALUE;
            } else {
                return SNMP_ERR_WRONGVALUE;
            }
        }
    } else if (action == UNDO || action == FREE) {
        if ((uptr = usm_parse_user(name, name_len)) != NULL && resetOnFail) {
            uptr->userStorageType = oldValue;
        }
    }
    return SNMP_ERR_NOERROR;
}                               /* end write_usmUserStorageType() */

/*
 * Return 1 if enough objects have been set up to transition rowStatus to
 * notInService(2) or active(1).  
 */

int
usmStatusCheck(struct usmUser *uptr)
{
    if (uptr == NULL) {
        return 0;
    } else {
        if (uptr->cloneFrom == NULL) {
            return 0;
        }
    }
    return 1;
}

/*******************************************************************-o-******
 * write_usmUserStatus
 *
 * Parameters:
 *	 action
 *	*var_val
 *	 var_val_type
 *	 var_val_len
 *	*statP
 *	*name
 *	 name_len
 *      
 * Returns:
 *	SNMP_ERR_NOERROR		On success.
 *	SNMP_ERR_GENERR	
 *	SNMP_ERR_INCONSISTENTNAME
 *	SNMP_ERR_INCONSISTENTVALUE
 *	SNMP_ERR_WRONGLENGTH
 *	SNMP_ERR_WRONGTYPE
 */
int
write_usmUserStatus(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;
    unsigned char  *engineID;
    size_t          engineIDLen;
    char           *newName;
    size_t          nameLen;
    struct usmUser *uptr = NULL;

    if (action == RESERVE1) {
        if (var_val_type != ASN_INTEGER) {
            DEBUGMSGTL(("usmUser",
                        "write to usmUserStatus not ASN_INTEGER\n"));
            return SNMP_ERR_WRONGTYPE;
        }
        if (var_val_len != sizeof(long_ret)) {
            DEBUGMSGTL(("usmUser",
                        "write to usmUserStatus: bad length\n"));
            return SNMP_ERR_WRONGLENGTH;
        }
        long_ret = *((long *) var_val);
        if (long_ret == RS_NOTREADY || long_ret < 1 || long_ret > 6) {
            return SNMP_ERR_WRONGVALUE;
        }

        /*
         * See if we can parse the oid for engineID/name first.  
         */
        if (usm_parse_oid(&name[USM_MIB_LENGTH], name_len - USM_MIB_LENGTH,
                          &engineID, &engineIDLen, (u_char **) & newName,
                          &nameLen)) {
            return SNMP_ERR_INCONSISTENTNAME;
        }

        if (engineIDLen < 5 || engineIDLen > 32 || nameLen < 1
            || nameLen > 32) {
            SNMP_FREE(engineID);
            SNMP_FREE(newName);
            return SNMP_ERR_NOCREATION;
        }

        /*
         * Now see if a user already exists with these index values. 
         */
        uptr = usm_get_user(engineID, engineIDLen, newName);

        if (uptr != NULL) {
            if (long_ret == RS_CREATEANDGO || long_ret == RS_CREATEANDWAIT) {
                SNMP_FREE(engineID);
                SNMP_FREE(newName);
                long_ret = RS_NOTREADY;
                return SNMP_ERR_INCONSISTENTVALUE;
            }
            SNMP_FREE(engineID);
            SNMP_FREE(newName);
        } else {
            if (long_ret == RS_ACTIVE || long_ret == RS_NOTINSERVICE) {
                SNMP_FREE(engineID);
                SNMP_FREE(newName);
                return SNMP_ERR_INCONSISTENTVALUE;
            }
            if (long_ret == RS_CREATEANDGO || long_ret == RS_CREATEANDWAIT) {
                if ((uptr = usm_create_user()) == NULL) {
                    SNMP_FREE(engineID);
                    SNMP_FREE(newName);
                    return SNMP_ERR_RESOURCEUNAVAILABLE;
                }
                uptr->engineID = engineID;
                uptr->name = newName;
                uptr->secName = strdup(uptr->name);
                if (uptr->secName == NULL) {
                    usm_free_user(uptr);
                    return SNMP_ERR_RESOURCEUNAVAILABLE;
                }
                uptr->engineIDLen = engineIDLen;

                /*
                 * Set status to createAndGo or createAndWait so we can tell
                 * that this row is under creation.  
                 */

                uptr->userStatus = long_ret;

                /*
                 * Add to the list of users (we will take it off again
                 * later if something goes wrong).  
                 */

                usm_add_user(uptr);
            } else {
                SNMP_FREE(engineID);
                SNMP_FREE(newName);
            }
        }
    } else if (action == ACTION) {
        usm_parse_oid(&name[USM_MIB_LENGTH], name_len - USM_MIB_LENGTH,
                      &engineID, &engineIDLen, (u_char **) & newName,
                      &nameLen);
        uptr = usm_get_user(engineID, engineIDLen, newName);
        SNMP_FREE(engineID);
        SNMP_FREE(newName);

        if (uptr != NULL) {
            if (long_ret == RS_CREATEANDGO || long_ret == RS_ACTIVE) {
                if (usmStatusCheck(uptr)) {
                    uptr->userStatus = RS_ACTIVE;
                } else {
                    SNMP_FREE(engineID);
                    SNMP_FREE(newName);
                    return SNMP_ERR_INCONSISTENTVALUE;
                }
            } else if (long_ret == RS_CREATEANDWAIT) {
                if (usmStatusCheck(uptr)) {
                    uptr->userStatus = RS_NOTINSERVICE;
                } else {
                    uptr->userStatus = RS_NOTREADY;
                }
            } else if (long_ret == RS_NOTINSERVICE) {
                if (uptr->userStatus == RS_ACTIVE ||
                    uptr->userStatus == RS_NOTINSERVICE) {
                    uptr->userStatus = RS_NOTINSERVICE;
                } else {
                    return SNMP_ERR_INCONSISTENTVALUE;
                }
            }
        }
    } else if (action == COMMIT) {
        usm_parse_oid(&name[USM_MIB_LENGTH], name_len - USM_MIB_LENGTH,
                      &engineID, &engineIDLen, (u_char **) & newName,
                      &nameLen);
        uptr = usm_get_user(engineID, engineIDLen, newName);
        SNMP_FREE(engineID);
        SNMP_FREE(newName);

        if (uptr != NULL) {
            if (long_ret == RS_DESTROY) {
                usm_remove_user(uptr);
                usm_free_user(uptr);
            }
        }
    } else if (action == UNDO || action == FREE) {
        usm_parse_oid(&name[USM_MIB_LENGTH], name_len - USM_MIB_LENGTH,
                      &engineID, &engineIDLen, (u_char **) & newName,
                      &nameLen);
        uptr = usm_get_user(engineID, engineIDLen, newName);
        SNMP_FREE(engineID);
        SNMP_FREE(newName);

        if (long_ret == RS_CREATEANDGO || long_ret == RS_CREATEANDWAIT) {
            usm_remove_user(uptr);
            usm_free_user(uptr);
        }
    }

    return SNMP_ERR_NOERROR;
}

#if 0

    /*
     * see if we can parse the oid for engineID/name first 
     */
if (usm_parse_oid(&name[USM_MIB_LENGTH], name_len - USM_MIB_LENGTH,
                  &engineID, &engineIDLen, (u_char **) & newName,
                  &nameLen))
    return SNMP_ERR_INCONSISTENTNAME;

    /*
     * Now see if a user already exists with these index values 
     */
uptr = usm_get_user(engineID, engineIDLen, newName);


if (uptr) {                     /* If so, we set the appropriate value... */
    free(engineID);
    free(newName);
    if (long_ret == RS_CREATEANDGO || long_ret == RS_CREATEANDWAIT) {
        return SNMP_ERR_INCONSISTENTVALUE;
    }
    if (long_ret == RS_DESTROY) {
        usm_remove_user(uptr);
        usm_free_user(uptr);
    } else {
        uptr->userStatus = long_ret;
    }

} else {                        /* ...else we create a new user */
    /*
     * check for a valid status column set 
     */
    if (long_ret == RS_ACTIVE || long_ret == RS_NOTINSERVICE) {
        free(engineID);
        free(newName);
        return SNMP_ERR_INCONSISTENTVALUE;
    }
    if (long_ret == RS_DESTROY) {
        /*
         * destroying a non-existent row is actually legal 
         */
        free(engineID);
        free(newName);
        return SNMP_ERR_NOERROR;
    }

    /*
     * generate a new user 
     */
    if ((uptr = usm_create_user()) == NULL) {
        free(engineID);
        free(newName);
        return SNMP_ERR_GENERR;
    }

    /*
     * copy in the engineID 
     */
    uptr->engineID = (unsigned char *) malloc(engineIDLen);
    if (uptr->engineID == NULL) {
        free(engineID);
        free(newName);
        usm_free_user(uptr);
        return SNMP_ERR_GENERR;
    }
    uptr->engineIDLen = engineIDLen;
    memcpy(uptr->engineID, engineID, engineIDLen);
    free(engineID);

    /*
     * copy in the name and secname 
     */
    if ((uptr->name = strdup(newName)) == NULL) {
        free(newName);
        usm_free_user(uptr);
        return SNMP_ERR_GENERR;
    }
    free(newName);
    if ((uptr->secName = strdup(uptr->name)) == NULL) {
        usm_free_user(uptr);
        return SNMP_ERR_GENERR;
    }

    /*
     * set the status of the row based on the request 
     */
    if (long_ret == RS_CREATEANDGO)
        uptr->userStatus = RS_ACTIVE;
    else if (long_ret == RS_CREATEANDWAIT)
        uptr->userStatus = RS_NOTINSERVICE;

    /*
     * finally, add it to our list of users 
     */
    usm_add_user(uptr);

}                               /* endif -- uptr */
}                               /* endif -- action==COMMIT */

return SNMP_ERR_NOERROR;

}                               /* end write_usmUserStatus() */
#endif