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124 lines
3.7 KiB
124 lines
3.7 KiB
// Copyright 2017 clair authors
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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 dpkg implements a featurefmt.Lister for dpkg packages.
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package dpkg
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import (
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"bufio"
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"regexp"
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"strings"
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log "github.com/sirupsen/logrus"
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"github.com/coreos/clair/database"
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"github.com/coreos/clair/ext/featurefmt"
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"github.com/coreos/clair/ext/versionfmt"
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"github.com/coreos/clair/ext/versionfmt/dpkg"
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"github.com/coreos/clair/pkg/tarutil"
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)
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var (
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dpkgSrcCaptureRegexp = regexp.MustCompile(`Source: (?P<name>[^\s]*)( \((?P<version>.*)\))?`)
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dpkgSrcCaptureRegexpNames = dpkgSrcCaptureRegexp.SubexpNames()
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)
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type lister struct{}
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func init() {
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featurefmt.RegisterLister("dpkg", dpkg.ParserName, &lister{})
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}
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func (l lister) ListFeatures(files tarutil.FilesMap) ([]database.Feature, error) {
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f, hasFile := files["var/lib/dpkg/status"]
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if !hasFile {
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return []database.Feature{}, nil
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}
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// Create a map to store packages and ensure their uniqueness
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packagesMap := make(map[string]database.Feature)
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var pkg database.Feature
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var err error
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scanner := bufio.NewScanner(strings.NewReader(string(f)))
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for scanner.Scan() {
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line := scanner.Text()
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if strings.HasPrefix(line, "Package: ") {
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// Package line
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// Defines the name of the package
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pkg.Name = strings.TrimSpace(strings.TrimPrefix(line, "Package: "))
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pkg.Version = ""
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} else if strings.HasPrefix(line, "Source: ") {
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// Source line (Optionnal)
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// Gives the name of the source package
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// May also specifies a version
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srcCapture := dpkgSrcCaptureRegexp.FindAllStringSubmatch(line, -1)[0]
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md := map[string]string{}
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for i, n := range srcCapture {
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md[dpkgSrcCaptureRegexpNames[i]] = strings.TrimSpace(n)
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}
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pkg.Name = md["name"]
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if md["version"] != "" {
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version := md["version"]
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err = versionfmt.Valid(dpkg.ParserName, version)
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if err != nil {
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log.WithError(err).WithField("version", string(line[1])).Warning("could not parse package version. skipping")
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} else {
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pkg.Version = version
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}
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}
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} else if strings.HasPrefix(line, "Version: ") && pkg.Version == "" {
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// Version line
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// Defines the version of the package
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// This version is less important than a version retrieved from a Source line
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// because the Debian vulnerabilities often skips the epoch from the Version field
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// which is not present in the Source version, and because +bX revisions don't matter
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version := strings.TrimPrefix(line, "Version: ")
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err = versionfmt.Valid(dpkg.ParserName, version)
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if err != nil {
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log.WithError(err).WithField("version", string(line[1])).Warning("could not parse package version. skipping")
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} else {
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pkg.Version = version
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}
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} else if line == "" {
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pkg.Name = ""
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pkg.Version = ""
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}
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// Add the package to the result array if we have all the informations
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if pkg.Name != "" && pkg.Version != "" {
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packagesMap[pkg.Name+"#"+pkg.Version] = pkg
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pkg.Name = ""
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pkg.Version = ""
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}
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}
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// Convert the map to a slice and add version format.
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packages := make([]database.Feature, 0, len(packagesMap))
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for _, pkg := range packagesMap {
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pkg.VersionFormat = dpkg.ParserName
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packages = append(packages, pkg)
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}
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return packages, nil
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}
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func (l lister) RequiredFilenames() []string {
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return []string{"var/lib/dpkg/status"}
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}
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