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|
package main
import (
"bufio"
"context"
"log"
logger "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"
)
type match struct {
dnsName string
onionName string
httpHeader bool
htmlAttr bool
}
func main() {
opts := options.Parse()
cli := &http.Client{
Transport: &http.Transport{
DisableKeepAlives: true,
},
}
// sanCh is a channel of names that our workers should visit
sanCh := make(chan string, 2*opts.NumWorkers)
defer close(sanCh)
// matchCh is a channel of matches, i.e., sites that had Onion-Location
matchCh := make(chan match, 2*opts.NumWorkers)
defer close(matchCh)
// missCh is a channel of misses, i.e., the number of sites that had not
// configured Onion-Location. True means HTTP GET succeeded.
missCh := make(chan bool, 2*opts.NumWorkers)
defer close(missCh)
var wg sync.WaitGroup
defer wg.Wait()
ctx, cancel := context.WithCancel(context.Background())
defer log.Printf("INFO: completed")
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, sanCh, matchCh, missCh)
}()
}
log.Printf("INFO: starting work receiver\n")
go func() {
wg.Add(1)
defer wg.Done()
workAggregator(ctx, cancel, opts, matchCh, missCh)
}()
log.Printf("INFO: generating work\n")
workGenerator(ctx, cancel, opts, sanCh)
time.Sleep(time.Second)
defer cancel()
for {
select {
case <-ctx.Done():
logger.Printf("DEBUG: context cancelled, exiting...\n")
return
case <-time.After(1 * time.Second):
}
numMessages := len(sanCh) + len(matchCh) + len(missCh)
if numMessages == 0 {
logger.Printf("Exit scheduled in %v from now", 2*opts.Timeout)
time.Sleep(2 * opts.Timeout)
return // TODO: fix a cleaner exit
}
logger.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,
sanCh chan string, matchCh chan match, missCh chan bool) {
for {
select {
case <-ctx.Done():
return
case san := <-sanCh:
func() {
cctx, cancel := context.WithTimeout(ctx, opts.Timeout)
defer cancel()
req, err := http.NewRequestWithContext(cctx, http.MethodGet, "https://"+san, nil)
if err != nil {
logger.Printf("DEBUG: %s: %v", san, err)
return
}
rsp, err := cli.Do(req)
if err != nil {
missCh <- false
return
}
defer rsp.Body.Close()
v, ok := onionloc.HTTP(rsp)
if ok {
matchCh <- match{dnsName: san, onionName: v, httpHeader: true}
return
}
v, ok = onionloc.HTML(rsp)
if ok {
matchCh <- match{dnsName: san, onionName: v, htmlAttr: true}
return
}
missCh <- true
}()
}
}
}
func workAggregator(ctx context.Context, _ context.CancelFunc, opts options.Options, matchCh chan match, missCh chan bool) {
ticker := time.NewTicker(opts.MetricsInterval)
defer ticker.Stop()
numConnected := 0
numOnionLocation := 0
numVisits := 0
output := func() {
logger.Printf("INFO: %d/%d connected, %d matched\n", numConnected, numVisits, numOnionLocation)
}
defer output()
for {
select {
case <-ctx.Done():
return
case m := <-matchCh:
numVisits += 1
numConnected += 1
numOnionLocation += 1
log.Printf("INFO: found match %s (HTTP:%v HTML:%v)\n", m.dnsName, m.httpHeader, m.htmlAttr)
case connected := <-missCh:
numVisits += 1
if connected {
numConnected += 1
}
case <-ticker.C:
output()
}
}
}
func workGenerator(ctx context.Context, cancel context.CancelFunc, opts options.Options, sanCh chan string) {
fp, err := os.OpenFile(opts.InputFile, os.O_RDONLY, 0644)
if err != nil {
logger.Printf("ERROR: %v", err)
cancel()
return
}
defer fp.Close()
scanner := bufio.NewScanner(fp)
max := 1024 * 1024
buf := make([]byte, 0, max)
scanner.Buffer(buf, max)
for scanner.Scan() {
select {
case <-ctx.Done():
return
default:
}
for {
if len(sanCh) < cap(sanCh) {
sanCh <- scanner.Text()
break
}
select {
case <-ctx.Done():
return
case <-time.After(time.Second):
continue
}
}
}
}
|
