add config options for timeout + resolver address

cmd/boulder-va/main.go

@@ -33,6 +33,10 @@ func main() {
 		go cmd.ProfileCmd("VA", stats)
 
 		vai := va.NewValidationAuthorityImpl(c.CA.TestMode)
+		vai.DNSResolver = c.VA.DNSResolver
+		dnsTimeout, err := time.ParseDuration(c.VA.DNSTimeout)
+		cmd.FailOnError(err, "Couldn't parse DNS timeout")
+		vai.DNSTimeout = dnsTimeout
 
 		for {
 			ch := cmd.AmqpChannel(c.AMQP.Server)

cmd/boulder/main.go

@@ -81,6 +81,10 @@ func main() {
 
 		ra := ra.NewRegistrationAuthorityImpl()
 		va := va.NewValidationAuthorityImpl(c.CA.TestMode)
+		va.DNSResolver = c.VA.DNSResolver
+		dnsTimeout, err := time.ParseDuration(c.VA.DNSTimeout)
+		cmd.FailOnError(err, "Couldn't parse DNS timeout")
+		va.DNSTimeout = dnsTimeout
 
 		cadb, err := ca.NewCertificateAuthorityDatabaseImpl(c.CA.DBDriver, c.CA.DBName)
 		cmd.FailOnError(err, "Failed to create CA database")

cmd/shell.go

@@ -69,6 +69,11 @@ type Config struct {
 		DBName   string
 	}
 
+	VA struct {
+		DNSResolver string
+		DNSTimeout  string
+	}
+
 	SQL struct {
 		CreateTables bool
 		SQLDebug     bool

test/boulder-config.json

@@ -54,6 +54,11 @@
     "dbName": ":memory:"
   },
 
+  "va": {
+    "dnsResolver": "8.8.8.8:53",
+    "dnsTimeout": "10s"
+  },
+
   "sql": {
     "SQLDebug": true,
     "CreateTables": false