jschoubben
0dbe8f9a32
The operator sees per module and node what is assigned, what the node reports and what it waits on; a have with no open assignment is left behind, never running.
114 lines
3.0 KiB
Go
114 lines
3.0 KiB
Go
// Copyright (c) 2018, Google LLC All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package tpmutil provides common utility functions for both TPM 1.2 and TPM
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// 2.0 devices.
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package tpmutil
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import (
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"errors"
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"io"
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"os"
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"time"
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)
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// maxTPMResponse is the largest possible response from the TPM. We need to know
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// this because we don't always know the length of the TPM response, and
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// /dev/tpm insists on giving it all back in a single value rather than
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// returning a header and a body in separate responses.
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const maxTPMResponse = 4096
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// RunCommandRaw executes the given raw command and returns the raw response.
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// Does not check the response code except to execute retry logic.
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func RunCommandRaw(rw io.ReadWriter, inb []byte) ([]byte, error) {
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if rw == nil {
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return nil, errors.New("nil TPM handle")
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}
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// f(t) = (2^t)ms, up to 2s
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var backoffFac uint
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var rh responseHeader
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var outb []byte
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for {
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if _, err := rw.Write(inb); err != nil {
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return nil, err
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}
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// If the TPM is a real device, it may not be ready for reading
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// immediately after writing the command. Wait until the file
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// descriptor is ready to be read from.
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if f, ok := rw.(*os.File); ok {
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if err := poll(f); err != nil {
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return nil, err
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}
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}
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outb = make([]byte, maxTPMResponse)
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outlen, err := rw.Read(outb)
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if err != nil {
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return nil, err
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}
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// Resize the buffer to match the amount read from the TPM.
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outb = outb[:outlen]
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_, err = Unpack(outb, &rh)
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if err != nil {
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return nil, err
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}
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// If TPM is busy, retry the command after waiting a few ms.
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if rh.Res == RCRetry {
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if backoffFac < 11 {
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dur := (1 << backoffFac) * time.Millisecond
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time.Sleep(dur)
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backoffFac++
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} else {
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return nil, err
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}
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} else {
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break
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}
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}
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return outb, nil
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}
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// RunCommand executes cmd with given tag and arguments. Returns TPM response
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// body (without response header) and response code from the header. Returned
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// error may be nil if response code is not RCSuccess; caller should check
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// both.
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func RunCommand(rw io.ReadWriter, tag Tag, cmd Command, in ...interface{}) ([]byte, ResponseCode, error) {
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inb, err := packWithHeader(commandHeader{tag, 0, cmd}, in...)
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if err != nil {
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return nil, 0, err
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}
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outb, err := RunCommandRaw(rw, inb)
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if err != nil {
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return nil, 0, err
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}
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var rh responseHeader
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read, err := Unpack(outb, &rh)
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if err != nil {
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return nil, 0, err
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}
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if rh.Res != RCSuccess {
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return nil, rh.Res, nil
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}
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return outb[read:], rh.Res, nil
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}
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