diff options
Diffstat (limited to 'nvdmirror/nvdmirror.go')
| -rw-r--r-- | nvdmirror/nvdmirror.go | 101 |
1 files changed, 61 insertions, 40 deletions
diff --git a/nvdmirror/nvdmirror.go b/nvdmirror/nvdmirror.go index 7b092b1..da758ad 100644 --- a/nvdmirror/nvdmirror.go +++ b/nvdmirror/nvdmirror.go @@ -12,28 +12,46 @@ import ( "time" ) -// URLs -type Urls struct { - // CVE 1.1 Base URL. The full meta and JSON URLs are constructed from - // this appended to this base.. - Cve11Base string +// default user agent (FIXME: make configurable) +var defaultUserAgent = "cvez/0.1.0" + +// Sync() configuration. +type SyncConfig struct { + // CVE 1.1 Base URL. The full meta and JSON URLs are constructed by + // appending the file name to this base. + Cve11BaseUrl string + + // CPE 1.0 base URL. The full meta and JSON URLs are constructed by + // appending the file name to this base. + Cpe10MatchBaseUrl string - // CPE 1.0 match meta URL - Cpe10MatchMeta string + // CPE 2.3 dictionary URL. + Cpe23DictUrl string - // CPE 1.0 match URL - Cpe10MatchJson string + // User agent string. Set to "" for default user agent string. + UserAgent string - // CPE 2.3 dictionary URL - Cpe23Dict string + // Maximum number of idle connections. + MaxIdleConns int + + // Idle connection timeout. + IdleConnTimeout time.Duration +} + +// Get user agent string. +func (me SyncConfig) GetUserAgent() string { + if len(me.UserAgent) > 0 { + return me.UserAgent + } else { + return defaultUserAgent + } } // NVD URLs -var DefaultUrls = Urls { - Cve11Base: "https://nvd.nist.gov/feeds/json/cve/1.1", - Cpe10MatchMeta: "https://nvd.nist.gov/feeds/json/cpematch/1.0/nvdcpematch-1.0.meta", - Cpe10MatchJson: "https://nvd.nist.gov/feeds/json/cpematch/1.0/nvdcpematch-1.0.gz", - Cpe23Dict: "https://nvd.nist.gov/feeds/xml/cpe/dictionary/official-cpe-dictionary_v2.3.xml.gz", +var DefaultConfig = SyncConfig { + Cve11BaseUrl: "https://nvd.nist.gov/feeds/json/cve/1.1", + Cpe10MatchBaseUrl: "https://nvd.nist.gov/feeds/json/cpematch/1.0", + Cpe23DictUrl: "https://nvd.nist.gov/feeds/xml/cpe/dictionary/official-cpe-dictionary_v2.3.xml.gz", } var extraFiles = []string { @@ -45,7 +63,7 @@ var extraFiles = []string { type fetchResult struct { src string // source URL err error // fetch result - notModified bool // was the result unmodified? + modified bool // was the result modified? lastModified string // last modified response header etag string // etag response header } @@ -53,10 +71,7 @@ type fetchResult struct { // base CVE year const baseYear = 2002 -// default user agent (FIXME: make configurable) -var userAgent = "cvez/0.1.0" - -func fetch(ch chan fetchResult, client *http.Client, cache Cache, srcUrl string, dstDir string) { +func fetch(ch chan fetchResult, config SyncConfig, cache Cache, client *http.Client, srcUrl string, dstDir string) { // parse source url src, err := url.Parse(srcUrl) if err != nil { @@ -84,7 +99,7 @@ func fetch(ch chan fetchResult, client *http.Client, cache Cache, srcUrl string, } // add request headers - req.Header.Add("user-agent", userAgent) + req.Header.Add("user-agent", config.GetUserAgent()) if headers, ok := cache.Get(srcUrl); ok { for k, v := range(headers) { req.Header.Add(k, v) @@ -104,20 +119,21 @@ func fetch(ch chan fetchResult, client *http.Client, cache Cache, srcUrl string, // copy body to result if size, err := io.Copy(f, resp.Body); err != nil { // copy failed - ch <- fetchResult { src: srcUrl, err: err } + ch <- fetchResult { src: srcUrl, err: err, modified: false } } else if err = os.Rename(f.Name(), path); err != nil { // rename failed - ch <- fetchResult { src: srcUrl, err: err } + ch <- fetchResult { src: srcUrl, err: err, modified: false } } else { log.Debug().Str("url", srcUrl).Int64("size", size).Send() ch <- fetchResult { src: srcUrl, + modified: true, lastModified: resp.Header.Get("last-modified"), etag: resp.Header.Get("etag"), } } case 304: - ch <- fetchResult { src: srcUrl, notModified: true } + ch <- fetchResult { src: srcUrl, modified: false } default: code := resp.StatusCode err := fmt.Errorf("%d: %s", code, http.StatusText(code)) @@ -125,7 +141,7 @@ func fetch(ch chan fetchResult, client *http.Client, cache Cache, srcUrl string, } } -func Sync(urls Urls, cache Cache, dstDir string) error { +func Sync(config SyncConfig, cache Cache, dstDir string) error { log.Debug().Str("dstDir", dstDir).Msg("Sync") // create fetch result channel @@ -133,27 +149,27 @@ func Sync(urls Urls, cache Cache, dstDir string) error { // create shared transport and client tr := &http.Transport{ - // FIXME: make configurable - MaxIdleConns: 10, - IdleConnTimeout: 30 * time.Second, + MaxIdleConns: config.MaxIdleConns, + IdleConnTimeout: config.IdleConnTimeout, } client := &http.Client{Transport: tr} // calculate total number of years - numYears := time.Now().Year() - 2002 + 1 + numYears := time.Now().Year() - baseYear + 1 - // fetch metas + // fetch cve feed metas for year := baseYear; year < baseYear + numYears; year++ { // build url - url := fmt.Sprintf("%s/nvdcve-1.1-%04d.meta", urls.Cve11Base, year) + url := fmt.Sprintf("%s/nvdcve-1.1-%04d.meta", config.Cve11BaseUrl, year) log.Debug().Int("year", year).Str("url", url).Send() - go fetch(ch, client, cache, url, dstDir) + go fetch(ch, config, cache, client, url, dstDir) } + // fetch cve extra file metas for _, s := range(extraFiles) { - url := fmt.Sprintf("%s/%s.meta", urls.Cve11Base, s) + url := fmt.Sprintf("%s/%s.meta", config.Cve11BaseUrl, s) log.Debug().Str("file", s).Str("url", url).Send() - go fetch(ch, client, cache, url, dstDir) + go fetch(ch, config, cache, client, url, dstDir) } // read results @@ -164,14 +180,15 @@ func Sync(urls Urls, cache Cache, dstDir string) error { } else { log.Info().Str("url", r.src).Str("etag", r.etag).Msg("ok") - if !r.notModified { - // cache headers - err := cache.Set(r.src, map[string]string { + if r.modified { + // build request headers + headers := map[string]string { "if-none-match": r.etag, "if-modified-since": r.lastModified, - }) + } - if err != nil { + // save headers to cache + if err := cache.Set(r.src, headers); err != nil { log.Error().Str("url", r.src).Err(r.err).Msg("Set") return err } @@ -179,6 +196,10 @@ func Sync(urls Urls, cache Cache, dstDir string) error { } } + // TODO: fetch cpe dictionary + // TODO: fetch cpematch + // "nvdcpematch-1.0.{meta,json}", + // return success return nil } |