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factory_linux.go
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factory_linux.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright 2014 Docker, Inc.
// Copyright 2023 Unikraft GmbH and The KraftKit Authors
package libmocktainer
import (
"encoding/json"
"errors"
"os"
securejoin "github.com/cyphar/filepath-securejoin"
"github.com/opencontainers/runc/libcontainer/utils"
"kraftkit.sh/libmocktainer/configs"
"kraftkit.sh/libmocktainer/configs/validate"
)
const (
stateFilename = "state.json"
execFifoFilename = "exec.fifo"
)
// Create creates a new container with the given id inside a given state
// directory (root), and returns a Container object.
//
// The root is a state directory which many containers can share. It can be
// used later to get the list of containers, or to get information about a
// particular container (see Load).
//
// The id must not be empty and consist of only the following characters:
// ASCII letters, digits, underscore, plus, minus, period. The id must be
// unique and non-existent for the given root path.
func Create(root, id string, config *configs.Config) (*Container, error) {
if root == "" {
return nil, errors.New("root not set")
}
if err := validateID(id); err != nil {
return nil, err
}
if err := validate.Validate(config); err != nil {
return nil, err
}
if err := os.MkdirAll(root, 0o700); err != nil {
return nil, err
}
containerRoot, err := securejoin.SecureJoin(root, id)
if err != nil {
return nil, err
}
if _, err := os.Stat(containerRoot); err == nil {
return nil, ErrExist
} else if !os.IsNotExist(err) {
return nil, err
}
// Parent directory is already created above, so Mkdir is enough.
if err := os.Mkdir(containerRoot, 0o711); err != nil {
return nil, err
}
c := &Container{
id: id,
root: containerRoot,
config: config,
}
c.state = &stoppedState{c: c}
return c, nil
}
// Load takes a path to the state directory (root) and an id of an existing
// container, and returns a Container object reconstructed from the saved
// state. This presents a read only view of the container.
func Load(root, id string) (*Container, error) {
if root == "" {
return nil, errors.New("root not set")
}
// when load, we need to check id is valid or not.
if err := validateID(id); err != nil {
return nil, err
}
containerRoot, err := securejoin.SecureJoin(root, id)
if err != nil {
return nil, err
}
state, err := loadState(containerRoot)
if err != nil {
return nil, err
}
r := &nonChildProcess{
processPid: state.InitProcessPid,
processStartTime: state.InitProcessStartTime,
}
c := &Container{
initProcess: r,
initProcessStartTime: state.InitProcessStartTime,
id: id,
config: &state.Config,
root: containerRoot,
created: state.Created,
}
c.state = &loadedState{c: c}
if err := c.refreshState(); err != nil {
return nil, err
}
return c, nil
}
func loadState(root string) (*State, error) {
stateFilePath, err := securejoin.SecureJoin(root, stateFilename)
if err != nil {
return nil, err
}
f, err := os.Open(stateFilePath)
if err != nil {
if os.IsNotExist(err) {
return nil, ErrNotExist
}
return nil, err
}
defer f.Close()
var state *State
if err := json.NewDecoder(f).Decode(&state); err != nil {
return nil, err
}
return state, nil
}
// validateID checks if the supplied container ID is valid, returning
// the ErrInvalidID in case it is not.
//
// The format of valid ID was never formally defined, instead the code
// was modified to allow or disallow specific characters.
//
// Currently, a valid ID is a non-empty string consisting only of
// the following characters:
// - uppercase (A-Z) and lowercase (a-z) Latin letters;
// - digits (0-9);
// - underscore (_);
// - plus sign (+);
// - minus sign (-);
// - period (.).
//
// In addition, IDs that can't be used to represent a file name
// (such as . or ..) are rejected.
func validateID(id string) error {
if len(id) < 1 {
return ErrInvalidID
}
// Allowed characters: 0-9 A-Z a-z _ + - .
for i := 0; i < len(id); i++ {
c := id[i]
switch {
case c >= 'a' && c <= 'z':
case c >= 'A' && c <= 'Z':
case c >= '0' && c <= '9':
case c == '_':
case c == '+':
case c == '-':
case c == '.':
default:
return ErrInvalidID
}
}
if string(os.PathSeparator)+id != utils.CleanPath(string(os.PathSeparator)+id) {
return ErrInvalidID
}
return nil
}