505 lines
10 KiB
Go
505 lines
10 KiB
Go
package utils
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import (
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"archive/tar"
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"bytes"
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"crypto/ed25519"
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"database/sql"
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"fmt"
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"io"
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"log"
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"net/http"
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"os"
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"os/exec"
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"path"
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"path/filepath"
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"strconv"
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"strings"
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"syscall"
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"packets/configs"
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"packets/internal/consts"
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errors_packets "packets/internal/errors"
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"github.com/klauspost/compress/zstd"
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"github.com/pelletier/go-toml/v2"
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)
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type Package struct {
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PackageF []byte
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Version string
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ImageUrl string
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QueryName string
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Description string
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Author string
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AuthorVerified bool
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OS string
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Arch string
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Filename string
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Size int64
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Dependencies map[string]string
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Signature []byte
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PublicKey ed25519.PublicKey
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Manifest configs.Manifest
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Serial int
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}
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func GetFileHTTP(url string) ([]byte, error) {
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resp, err := http.Get(url)
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if err != nil {
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log.Fatal(err)
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}
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if resp.StatusCode != http.StatusOK {
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return nil, errors_packets.ErrResponseNot200OK
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}
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fileBytes, err := io.ReadAll(resp.Body)
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if err != nil {
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return nil, err
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}
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return fileBytes, nil
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}
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// ReadManifest is crucial to get package metadata it reads manifest.toml from a package file (tar.zst)
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func ReadManifest(file io.Reader) (configs.Manifest, error) {
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zstdReader, err := zstd.NewReader(file)
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if err != nil {
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return configs.Manifest{}, err
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}
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defer zstdReader.Close()
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tarReader := tar.NewReader(zstdReader)
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for {
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header, err := tarReader.Next()
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if err == io.EOF {
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break
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}
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if err != nil {
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return configs.Manifest{}, err
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}
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if filepath.Base(header.Name) == "manifest.toml" {
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decoder := toml.NewDecoder(tarReader)
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var manifest configs.Manifest
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if err := decoder.Decode(&manifest); err != nil {
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return configs.Manifest{}, nil
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}
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return manifest, nil
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}
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}
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return configs.Manifest{}, errors_packets.ErrCantFindManifestTOML
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}
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// CopyDir copies a directory from source to destination
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func CopyDir(src string, dest string) error {
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if stats, err := os.Stat(src); err != nil {
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return err
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} else {
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if stats.IsDir() {
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files, err := os.ReadDir(src)
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if err != nil {
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return err
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}
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if err := os.MkdirAll(dest, 0o755); err != nil {
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return err
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}
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for _, file := range files {
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if file.IsDir() {
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CopyDir(filepath.Join(src, file.Name()), filepath.Join(dest, file.Name()))
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continue
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}
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srcFile := filepath.Join(src, file.Name())
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f, err := os.Create(filepath.Join(dest, file.Name()))
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if err != nil {
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return err
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}
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defer f.Close()
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opennedSrcFile, err := os.Open(srcFile)
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if err != nil {
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return err
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}
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defer opennedSrcFile.Close()
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if _, err := io.Copy(f, opennedSrcFile); err != nil {
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return err
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}
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}
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} else {
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if err := CopyFile(src, dest); err != nil {
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return err
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}
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}
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}
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return nil
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}
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// CopyFile copies a file from source to destination
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func CopyFile(source string, destination string) error {
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src, err := os.Open(source)
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if err != nil {
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return err
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}
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defer src.Close()
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status, err := src.Stat()
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if err != nil {
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return err
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}
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err = os.MkdirAll(filepath.Dir(destination), 0o755)
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if err != nil {
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return err
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}
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dst, err := os.Create(destination)
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if err != nil {
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if !os.IsExist(err) {
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dst, err = os.Open(destination)
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if err != nil {
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return err
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}
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} else {
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return err
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}
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}
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defer dst.Close()
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if err := dst.Chmod(status.Mode()); err != nil {
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return err
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}
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_, err = io.Copy(dst, src)
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if err != nil {
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return err
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}
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return nil
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}
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// Write writes the package file to the cache directory and returns the path to it
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func (p *Package) Write() (string, error) {
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if err := os.WriteFile(filepath.Join(consts.DefaultCache_d, p.Filename), p.PackageF, 0o644); err != nil {
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_ = os.Remove(filepath.Join(consts.DefaultCache_d, p.Filename))
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return "", err
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}
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return filepath.Join(consts.DefaultCache_d, p.Filename), nil
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}
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func (p *Package) AddToInstalledDB(inCache int, packagePath string) error {
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db, err := sql.Open("sqlite", consts.InstalledDB)
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if err != nil {
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return err
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}
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defer db.Close()
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var success bool
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defer func() {
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if !success {
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_, err := db.Exec("DELETE FROM packages WHERE id = ?", p.Manifest.Info.Id)
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if err != nil {
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log.Println("failed to rollback package addition:", err)
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}
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}
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}()
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_, err = db.Exec(`
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INSERT INTO packages (
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query_name, id, version, description,
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serial, package_d, filename, os, arch, in_cache
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) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
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p.QueryName,
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p.Manifest.Info.Id,
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p.Version,
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p.Description,
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p.Serial,
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packagePath,
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p.Filename,
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p.OS,
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p.Arch,
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inCache,
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)
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if err != nil {
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return err
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}
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for depnName, versionConstraint := range p.Dependencies {
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_, err = db.Exec("INSERT INTO package_dependencies (package_id, dependency_name, version_constraint) VALUES (?, ?, ?)", p.Manifest.Info.Id, depnName, versionConstraint)
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}
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success = true
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return err
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}
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func CheckIfPackageInstalled(name string) (bool, error) {
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db, err := sql.Open("sqlite", consts.InstalledDB)
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if err != nil {
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return false, err
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}
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defer db.Close()
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var exists bool
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err = db.QueryRow("SELECT EXISTS(SELECT 1 FROM packages WHERE id = ? OR query_name = ?)", name, name).Scan(&exists)
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if err != nil {
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return false, err
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}
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return exists, nil
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}
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func GetDependencies(db *sql.DB, id string) (map[string]string, error) {
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rows, err := db.Query("SELECT dependency_name, version_constraint FROM package_dependencies WHERE package_id = ?", id)
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if err != nil {
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return map[string]string{}, err
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}
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defer rows.Close()
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dependencies := make(map[string]string)
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for rows.Next() {
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var a, versionConstraint string
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if err := rows.Scan(&a, &versionConstraint); err != nil {
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return map[string]string{}, err
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}
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dependencies[a] = versionConstraint
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}
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return dependencies, nil
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}
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func ResolvDependencies(depnList map[string]string) ([]string, error) {
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db, err := sql.Open("sqlite", consts.IndexDB)
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if err != nil {
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return []string{}, err
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}
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defer db.Close()
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var resolved []string
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for dependencieName, constraint := range depnList {
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var filter, order string
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value := strings.TrimLeft(constraint, "<>=")
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switch {
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case strings.HasPrefix(constraint, ">"):
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filter = fmt.Sprintf("AND serial > %s", value)
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order = "ORDER BY serial ASC LIMIT 1"
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case strings.HasPrefix(constraint, "<="):
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filter = fmt.Sprintf("AND serial <= %s", value)
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order = "ORDER BY serial DESC LIMIT 1"
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case strings.HasPrefix(constraint, "<"):
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filter = fmt.Sprintf("AND serial < %s", value)
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order = "ORDER BY serial DESC LIMIT 1"
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case strings.HasPrefix(constraint, "="):
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filter = fmt.Sprintf("AND serial = %s", value)
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order = ""
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}
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var packageId string
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err := db.QueryRow(fmt.Sprintf("SELECT id FROM packages WHERE query_name = ? %s %s", filter, order), dependencieName).Scan(&packageId)
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if err != nil {
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if err == sql.ErrNoRows {
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continue
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}
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return []string{}, err
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}
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resolved = append(resolved, packageId)
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dp, err := GetDependencies(db, packageId)
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if err != nil {
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return resolved, err
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}
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depn, err := ResolvDependencies(dp)
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if err != nil {
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return resolved, err
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}
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resolved = append(resolved, depn...)
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}
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return resolved, nil
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}
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func ManifestFileRead(file io.Reader) (configs.Manifest, error) {
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decoder := toml.NewDecoder(file)
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var manifest configs.Manifest
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if err := decoder.Decode(&manifest); err != nil {
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return configs.Manifest{}, nil
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}
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return manifest, nil
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}
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func RemoveFromInstalledDB(id string) error {
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db, err := sql.Open("sqlite", consts.InstalledDB)
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if err != nil {
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return err
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}
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if _, err = db.Exec("DELETE FROM packages WHERE id = ? OR query_name = ?", id, id); err != nil {
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return err
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}
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return nil
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}
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// GetPackage retrieves package information from the index database and downloads the package file
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func GetPackage(id string) (Package, error) {
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var this Package
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var peers []Peer
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db, err := sql.Open("sqlite", consts.IndexDB)
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if err != nil {
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return this, err
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}
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defer db.Close()
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var packageUrl string
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err = db.QueryRow("SELECT query_name, version, package_url, image_url, description, author, author_verified, os, arch, signature, public_key, serial, size FROM packages WHERE id = ?", id).
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Scan(
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&this.QueryName,
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&this.Version,
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&packageUrl,
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&this.ImageUrl,
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&this.Description,
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&this.Author,
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&this.AuthorVerified,
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&this.OS,
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&this.Arch,
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&this.Signature,
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&this.PublicKey,
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&this.Serial,
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&this.Size,
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)
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if err != nil {
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return Package{}, err
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}
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rows, err := db.Query("SELECT dependency_name, version_constraint FROM package_dependencies WHERE package_id = ?", id)
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if err != nil {
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return Package{}, err
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}
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defer rows.Close()
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for rows.Next() {
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var a, vConstraint string
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if err := rows.Scan(&a, &vConstraint); err != nil {
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return Package{}, err
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}
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this.Dependencies[a] = vConstraint
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}
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filename := path.Base(packageUrl)
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this.Filename = filename
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dirEntry, err := os.ReadDir(consts.DefaultCache_d)
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if err != nil {
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return Package{}, err
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}
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for _, v := range dirEntry {
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if v.Name() == filename {
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this.PackageF, err = os.ReadFile(filepath.Join(consts.DefaultCache_d, filename))
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if err != nil {
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break
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}
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goto skipping
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}
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}
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peers, err = AskLAN(filename)
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if err != nil {
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return Package{}, err
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}
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if len(peers) == 0 {
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this.PackageF, err = GetFileHTTP(packageUrl)
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if err != nil {
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return Package{}, err
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}
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} else {
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var totalerrors int = 0
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for _, peer := range peers {
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this.PackageF, err = GetFileHTTP(fmt.Sprintf("http://%s:%d/%s", peer.IP, peer.Port, filename))
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if err == nil {
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break
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} else {
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totalerrors++
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}
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}
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if totalerrors == len(peers) {
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this.PackageF, err = GetFileHTTP(packageUrl)
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if err != nil {
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return Package{}, err
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}
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}
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}
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skipping:
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reader := bytes.NewReader(this.PackageF)
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this.Manifest, err = ReadManifest(reader)
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if err != nil {
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return Package{}, err
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}
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if !ed25519.Verify(this.PublicKey, this.PackageF, this.Signature) {
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return Package{}, errors_packets.ErrInvalidSignature
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}
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return this, nil
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}
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func GetPacketsUID() (int, error) {
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_ = exec.Command("useradd", "-M", "-N", "-r", "packets").Run()
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cmd := exec.Command("id", "-u", "packets")
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out, err := cmd.CombinedOutput()
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if err != nil {
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return -1, err
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}
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s := strings.TrimSpace(string(out))
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uid, err := strconv.Atoi(s)
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if err != nil {
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return -1, err
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}
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return uid, nil
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}
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func ChangeToNoPermission() error {
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uid, err := GetPacketsUID()
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if err != nil {
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return err
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}
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return syscall.Setresuid(0, uid, 0)
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}
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func ElevatePermission() error { return syscall.Setresuid(0, 0, 0) }
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