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packages.go
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packages.go
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// Unless explicitly stated otherwise all files in this repository are licensed
// under the Apache License Version 2.0.
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2016-present Datadog, Inc.
package compliance
import (
"bufio"
"bytes"
"errors"
"io"
"net/textproto"
"os"
"slices"
rpmdb "github.com/knqyf263/go-rpmdb/pkg"
)
type packageInfo struct {
Name string `json:"name"`
Version string `json:"version"`
Arch string `json:"arch"`
}
func packageNameMatch(names []string, pkgName string) bool {
return slices.Contains(names, pkgName)
}
// scanBlock is a utility function that can be used to scan through text files
// that chunk using two-lined separators.
func scanBlock(data []byte, atEOF bool) (advance int, token []byte, err error) {
if atEOF && len(data) == 0 {
return 0, nil, nil
}
if n := bytes.Index(data, []byte("\n\n")); n != -1 {
return n + 2, data[0 : n+1], nil
}
if atEOF {
return len(data), data, nil
}
return
}
func findApkPackage(path string, names []string) *packageInfo {
f, err := os.Open(path)
if err != nil {
return nil
}
defer f.Close()
scanner := bufio.NewScanner(f)
scanner.Split(scanBlock)
for scanner.Scan() {
var p packageInfo
lines := bytes.Split(scanner.Bytes(), []byte("\n"))
for _, line := range lines {
if len(line) < 2 {
continue
}
key, value := line[:2], line[2:]
switch string(key) {
case "P:":
p.Name = string(value)
case "V:":
p.Version = string(value)
case "A:":
p.Arch = string(value)
}
}
if p.Name == "" {
continue
}
if packageNameMatch(names, p.Name) {
return &p
}
}
return nil
}
func findDpkgPackage(path string, names []string) *packageInfo {
f, err := os.Open(path)
if err != nil {
return nil
}
defer f.Close()
// The dpkg status databases is composed of blocks of "MIME" headers
// separated by two newlines.
//
// Fast path of this scan: as we chunk the database in blocks, we check in
// each block for a matching "Package: $name" substring in the block. Only
// if we find such a substring do we involve the more elaborated textproto
// MIME reader to fully parse the MIME block.
scanner := bufio.NewScanner(f)
scanner.Split(scanBlock)
pkgNamePrefix := []byte("Package:")
for scanner.Scan() {
chunk := scanner.Bytes()
lines := bytes.Split(chunk, []byte("\n"))
for _, line := range lines {
if !bytes.HasPrefix(line, pkgNamePrefix) {
continue
}
pkgName := string(bytes.TrimSpace(line[len(pkgNamePrefix):]))
if !packageNameMatch(names, pkgName) {
break
}
reader := textproto.NewReader(bufio.NewReader(bytes.NewReader(chunk)))
header, err := reader.ReadMIMEHeader()
if err != nil && !errors.Is(err, io.EOF) {
return nil
}
name := header.Get("Package")
if name != pkgName { // fast path miss
continue
}
return &packageInfo{
Name: name,
Version: header.Get("Version"),
Arch: header.Get("Architecture"),
}
}
}
return nil
}
func findRpmPackage(path string, names []string) *packageInfo {
if _, err := os.Stat(path); err != nil {
return nil
}
db, err := rpmdb.Open(path)
if err != nil {
return nil
}
defer db.Close()
pkgs, err := db.ListPackages()
if err != nil {
return nil
}
for _, pkg := range pkgs {
if !packageNameMatch(names, pkg.Name) {
return &packageInfo{
Name: pkg.Name,
Version: pkg.Version,
Arch: pkg.Arch,
}
}
}
return nil
}