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tls_config_other.go
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/
tls_config_other.go
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//go:build !ios
package chained
import (
"context"
"fmt"
"os"
"path/filepath"
tls "github.com/refraction-networking/utls"
"github.com/getlantern/flashlight/v7/hellocap"
)
const helloCacheFilename = "hello-cache.active-capture"
func cachedHello(configDir string) (*helloSpec, error) {
helloCacheFile := filepath.Join(configDir, helloCacheFilename)
sample, err := os.ReadFile(helloCacheFile)
if err == nil {
return &helloSpec{tls.HelloCustom, sample}, nil
}
return nil, fmt.Errorf("%w", err)
}
// ActivelyObtainBrowserHello obtains a sample TLS ClientHello via listening
// for local traffic.
func ActivelyObtainBrowserHello(ctx context.Context, configDir string) (*helloSpec, error) {
sample, err := hellocap.GetDefaultBrowserHello(ctx)
if err != nil {
return nil, fmt.Errorf("%w", err)
}
helloCacheFile := filepath.Join(configDir, helloCacheFilename)
if err := os.WriteFile(helloCacheFile, sample, 0644); err != nil {
log.Debugf("failed to write actively obtained hello to cache: %v", err)
} else {
log.Debugf("wrote actively obtained hello to cache")
}
return &helloSpec{tls.HelloCustom, sample}, nil
}