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/* Vuls - Vulnerability Scanner
Copyright (C) 2016 Future Architect, Inc. Japan.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package exploit
import (
"net/http"
"time"
"github.com/cenkalti/backoff"
"github.com/future-architect/vuls/util"
"github.com/parnurzeal/gorequest"
"golang.org/x/xerrors"
)
type response struct {
request request
json string
}
func getCvesViaHTTP(cveIDs []string, urlPrefix string) (
responses []response, err error) {
nReq := len(cveIDs)
reqChan := make(chan request, nReq)
resChan := make(chan response, nReq)
errChan := make(chan error, nReq)
defer close(reqChan)
defer close(resChan)
defer close(errChan)
go func() {
for _, cveID := range cveIDs {
reqChan <- request{
cveID: cveID,
}
}
}()
concurrency := 10
tasks := util.GenWorkers(concurrency)
for i := 0; i < nReq; i++ {
tasks <- func() {
select {
case req := <-reqChan:
url, err := util.URLPathJoin(
urlPrefix,
req.cveID,
)
if err != nil {
errChan <- err
} else {
util.Log.Debugf("HTTP Request to %s", url)
httpGet(url, req, resChan, errChan)
}
}
}
}
timeout := time.After(2 * 60 * time.Second)
var errs []error
for i := 0; i < nReq; i++ {
select {
case res := <-resChan:
responses = append(responses, res)
case err := <-errChan:
errs = append(errs, err)
case <-timeout:
return nil, xerrors.New("Timeout Fetching OVAL")
}
}
if len(errs) != 0 {
return nil, xerrors.Errorf("Failed to fetch OVAL. err: %w", errs)
}
return
}
type request struct {
osMajorVersion string
packName string
isSrcPack bool
cveID string
}
func httpGet(url string, req request, resChan chan<- response, errChan chan<- error) {
var body string
var errs []error
var resp *http.Response
count, retryMax := 0, 3
f := func() (err error) {
// resp, body, errs = gorequest.New().SetDebug(config.Conf.Debug).Get(url).End()
resp, body, errs = gorequest.New().Get(url).End()
if 0 < len(errs) || resp == nil || resp.StatusCode != 200 {
count++
if count == retryMax {
return nil
}
return xerrors.Errorf("HTTP GET error, url: %s, resp: %v, err: %w", url, resp, errs)
}
return nil
}
notify := func(err error, t time.Duration) {
util.Log.Warnf("Failed to HTTP GET. retrying in %s seconds. err: %s", t, err)
}
err := backoff.RetryNotify(f, backoff.NewExponentialBackOff(), notify)
if err != nil {
errChan <- xerrors.Errorf("HTTP Error %w", err)
return
}
if count == retryMax {
errChan <- xerrors.New("Retry count exceeded")
return
}
resChan <- response{
request: req,
json: body,
}
}
|
