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p2p/enode: mock DNS resolver in URL parsing test (#20252)

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This commit is contained in:
Felix Lange 2019-11-07 16:40:37 +01:00 committed by GitHub
parent 4b8f56cf98
commit adf007dadc
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 21 additions and 6 deletions
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17
p2p/enode/urlv4.go
View File

@ -31,7 +31,10 @@ import (
"github.com/ethereum/go-ethereum/p2p/enr"
)
var incompleteNodeURL = regexp.MustCompile("(?i)^(?:enode://)?([0-9a-f]+)$")
var (
incompleteNodeURL = regexp.MustCompile("(?i)^(?:enode://)?([0-9a-f]+)$")
lookupIPFunc = net.LookupIP
)
// MustParseV4 parses a node URL. It panics if the URL is not valid.
func MustParseV4(rawurl string) *Node {
@ -107,7 +110,6 @@ func isNewV4(n *Node) bool {
func parseComplete(rawurl string) (*Node, error) {
var (
id *ecdsa.PublicKey
ip net.IP
tcpPort, udpPort uint64
)
u, err := url.Parse(rawurl)
@ -125,11 +127,14 @@ func parseComplete(rawurl string) (*Node, error) {
return nil, fmt.Errorf("invalid public key (%v)", err)
}
// Parse the IP address.
ips, err := net.LookupIP(u.Hostname())
if err != nil {
return nil, err
ip := net.ParseIP(u.Hostname())
if ip == nil {
ips, err := lookupIPFunc(u.Hostname())
if err != nil {
return nil, err
}
ip = ips[0]
}
ip = ips[0]
// Ensure the IP is 4 bytes long for IPv4 addresses.
if ipv4 := ip.To4(); ipv4 != nil {
ip = ipv4

10
p2p/enode/urlv4_test.go
View File

@ -18,6 +18,7 @@ package enode
import (
"crypto/ecdsa"
"errors"
"net"
"reflect"
"strings"
@ -27,6 +28,15 @@ import (
"github.com/ethereum/go-ethereum/p2p/enr"
)
func init() {
lookupIPFunc = func(name string) ([]net.IP, error) {
if name == "node.example.org" {
return []net.IP{{33, 44, 55, 66}}, nil
}
return nil, errors.New("no such host")
}
}
var parseNodeTests = []struct {
input string
wantError string