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package main
import (
"bufio"
"context"
"fmt"
"log"
"net/http"
"os"
"os/signal"
"sync"
"syscall"
"time"
"git.cs.kau.se/rasmoste/find-onion/internal/onionloc"
"git.cs.kau.se/rasmoste/find-onion/internal/options"
"git.cs.kau.se/rasmoste/find-onion/internal/qna"
)
func main() {
opts := options.Parse()
cli := &http.Client{
Transport: &http.Transport{
DisableKeepAlives: true,
MaxResponseHeaderBytes: opts.MaxResponse,
},
}
questionCh := make(chan qna.Question, 2*opts.NumWorkers)
defer close(questionCh)
answerCh := make(chan qna.Answer, 2*opts.NumWorkers)
defer close(answerCh)
var wg sync.WaitGroup
defer wg.Wait()
ctx, cancel := context.WithCancel(context.Background())
log.Printf("INFO: starting await handler, ctrl+C to exit\n")
go func() {
wg.Add(1)
defer wg.Done()
await(ctx, cancel)
}()
log.Printf("INFO: starting %d workers\n", opts.NumWorkers)
for i := 0; i < opts.NumWorkers; i++ {
go func() {
wg.Add(1)
defer wg.Done()
workHandler(ctx, opts, cli, questionCh, answerCh)
}()
}
log.Printf("INFO: starting work aggregator\n")
go func() {
wg.Add(1)
defer wg.Done()
workAggregator(ctx, cancel, opts, answerCh)
}()
log.Printf("INFO: generating work\n")
workGenerator(ctx, cancel, opts, questionCh)
time.Sleep(time.Second)
defer cancel()
defer time.Sleep(2 * opts.Timeout)
defer log.Printf("INFO: about to exit in %v", 2*opts.Timeout)
for {
select {
case <-ctx.Done():
log.Printf("INFO: context cancelled")
return
case <-time.After(time.Second):
}
numMessages := len(questionCh) + len(answerCh)
if numMessages == 0 {
return
}
log.Printf("DEBUG: waiting for %d messages to be processed before exit", numMessages)
}
}
func await(ctx context.Context, cancel context.CancelFunc) {
sigs := make(chan os.Signal, 1)
defer close(sigs)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
select {
case <-sigs:
cancel()
case <-ctx.Done():
}
}
func workHandler(ctx context.Context, opts options.Options, cli *http.Client, questionCh chan qna.Question, answerCh chan qna.Answer) {
for {
select {
case <-ctx.Done():
return
case question := <-questionCh:
func() {
cctx, cancel := context.WithTimeout(ctx, opts.Timeout)
defer cancel()
req, err := http.NewRequestWithContext(cctx, http.MethodGet, "https://"+question.Domain, nil)
if err != nil {
return
}
rsp, err := cli.Do(req)
if err != nil {
answerCh <- qna.Answer{question.Domain, false, false, false, ""}
return
}
defer rsp.Body.Close()
v, ok := onionloc.HTTP(rsp)
if ok {
answerCh <- qna.Answer{question.Domain, true, true, false, v}
return
}
v, ok = onionloc.HTML(rsp)
if ok {
answerCh <- qna.Answer{question.Domain, true, false, true, v}
return
}
answerCh <- qna.Answer{question.Domain, true, false, false, ""}
}()
}
}
}
func workAggregator(ctx context.Context, _ context.CancelFunc, opts options.Options, answerCh chan qna.Answer) {
ticker := time.NewTicker(opts.MetricsInterval)
defer ticker.Stop()
numConnected := 0
numOnionLocation := 0
numVisits := 0
output := func() {
log.Printf("INFO: %d/%d connected, %d matched\n", numConnected, numVisits, numOnionLocation)
}
defer output()
for {
select {
case <-ctx.Done():
return
case a := <-answerCh:
numVisits += 1
if !a.OK {
continue
}
numConnected += 1
if a.HTTP || a.HTML {
numOnionLocation += 1
fmt.Printf("http:%v html:%v domain:%s onion:%s \n", a.HTTP, a.HTML, a.Domain, a.Onion)
}
case <-ticker.C:
output()
}
}
}
func workGenerator(ctx context.Context, cancel context.CancelFunc, opts options.Options, questionCh chan qna.Question) {
fp, err := os.OpenFile(opts.InputFile, os.O_RDONLY, 0644)
if err != nil {
log.Printf("ERROR: %v", err)
cancel()
return
}
defer fp.Close()
scanner := bufio.NewScanner(fp)
max := 2 * 256 * opts.NumWorkers
buf := make([]byte, 0, max)
scanner.Buffer(buf, max)
// TODO: track which line we would have to start from to be sure that
// we're not missing any domains on ctrl+C, OK if we go back too much?
for scanner.Scan() {
select {
case <-ctx.Done():
return
default:
}
for {
if len(questionCh) < cap(questionCh) {
questionCh <- qna.Question{Domain: scanner.Text()}
break
}
select {
case <-ctx.Done():
return
case <-time.After(time.Second):
continue
}
}
}
}
|
