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Add Fake DNS support (#309)

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Co-authored-by: Xiaokang Wang <xiaokangwang@outlook.com>
Co-authored-by: loyalsoldier <10487845+Loyalsoldier@users.noreply.github.com>
Co-authored-by: kslr <kslrwang@gmail.com>
This commit is contained in:
yuhan6665 2021-03-06 23:39:50 -05:00 • committed by GitHub
parent db32ce6fd9
commit f50eff5ebb
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GPG key ID: 4AEE18F83AFDEB23
43 changed files with 1351 additions and 301 deletions
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51
features/dns/localdns/client.go
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@ -20,58 +20,41 @@ func (*Client) Start() error { return nil }
func (*Client) Close() error { return nil }
// LookupIP implements Client.
func (*Client) LookupIP(host string) ([]net.IP, error) {
func (*Client) LookupIP(host string, option dns.IPOption) ([]net.IP, error) {
ips, err := net.LookupIP(host)
if err != nil {
return nil, err
}
parsedIPs := make([]net.IP, 0, len(ips))
ipv4 := make([]net.IP, 0, len(ips))
ipv6 := make([]net.IP, 0, len(ips))
for _, ip := range ips {
parsed := net.IPAddress(ip)
if parsed != nil {
parsedIPs = append(parsedIPs, parsed.IP())
}
}
if len(parsedIPs) == 0 {
return nil, dns.ErrEmptyResponse
}
return parsedIPs, nil
}
// LookupIPv4 implements IPv4Lookup.
func (c *Client) LookupIPv4(host string) ([]net.IP, error) {
ips, err := c.LookupIP(host)
if err != nil {
return nil, err
}
ipv4 := make([]net.IP, 0, len(ips))
for _, ip := range ips {
if len(ip) == net.IPv4len {
ipv4 = append(ipv4, ip)
}
}
if len(ipv4) == 0 {
return nil, dns.ErrEmptyResponse
}
return ipv4, nil
}
// LookupIPv6 implements IPv6Lookup.
func (c *Client) LookupIPv6(host string) ([]net.IP, error) {
ips, err := c.LookupIP(host)
if err != nil {
return nil, err
}
ipv6 := make([]net.IP, 0, len(ips))
for _, ip := range ips {
if len(ip) == net.IPv6len {
ipv6 = append(ipv6, ip)
}
}
if len(ipv6) == 0 {
return nil, dns.ErrEmptyResponse
switch {
case option.IPv4Enable && option.IPv6Enable:
if len(parsedIPs) > 0 {
return parsedIPs, nil
}
case option.IPv4Enable:
if len(ipv4) > 0 {
return ipv4, nil
}
case option.IPv6Enable:
if len(ipv6) > 0 {
return ipv6, nil
}
}
return ipv6, nil
return nil, dns.ErrEmptyResponse
}
// New create a new dns.Client that queries localhost for DNS.