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dns: optimize code

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This commit is contained in:
nadoo 2018-06-28 11:20:48 +08:00
parent f3db1980cf
commit 7fda4f8710
2 changed files with 22 additions and 11 deletions
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19
dns/dns.go
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@ -291,10 +291,7 @@ func (s *DNS) Exchange(reqLen uint16, reqMsg []byte, addr string) (respLen uint1
return
}
dnsServer := s.DNSServer
if !s.Tunnel {
dnsServer = s.GetServer(query.QNAME)
}
dnsServer := s.GetServer(query.QNAME)
rc, err := s.dialer.NextDialer(query.QNAME+":53").Dial("tcp", dnsServer)
if err != nil {
@ -366,13 +363,15 @@ func (s *DNS) SetServer(domain, server string) {
// GetServer .
func (s *DNS) GetServer(domain string) string {
domainParts := strings.Split(domain, ".")
length := len(domainParts)
for i := length - 2; i >= 0; i-- {
domain := strings.Join(domainParts[i:length], ".")
if !s.Tunnel {
domainParts := strings.Split(domain, ".")
length := len(domainParts)
for i := length - 2; i >= 0; i-- {
domain := strings.Join(domainParts[i:length], ".")
if server, ok := s.DNSServerMap[domain]; ok {
return server
if server, ok := s.DNSServerMap[domain]; ok {
return server
}
}
}

14
ipset_linux.go
View File

@ -21,8 +21,8 @@ import (
// https://github.com/torvalds/linux/blob/9e66317d3c92ddaab330c125dfe9d06eee268aff/include/uapi/linux/netfilter/nfnetlink.h#L56
const NFNL_SUBSYS_IPSET = 6
// http://git.netfilter.org/ipset/tree/include/libipset/linux_ip_set.h
// IPSET_PROTOCOL The protocol version
// http://git.netfilter.org/ipset/tree/include/libipset/linux_ip_set.h
const IPSET_PROTOCOL = 6
// IPSET_MAXNAMELEN The max length of strings including NUL: set and type identifiers
@ -146,6 +146,7 @@ func (m *IPSetManager) AddDomainIP(domain, ip string) error {
return nil
}
// CreateSet create a ipset
func CreateSet(fd int, lsa syscall.SockaddrNetlink, setName string) {
if setName == "" {
return
@ -189,6 +190,7 @@ func CreateSet(fd int, lsa syscall.SockaddrNetlink, setName string) {
FlushSet(fd, lsa, setName)
}
// FlushSet flush a ipset
func FlushSet(fd int, lsa syscall.SockaddrNetlink, setName string) {
log.F("ipset flush %s", setName)
@ -206,6 +208,7 @@ func FlushSet(fd int, lsa syscall.SockaddrNetlink, setName string) {
}
// AddToSet adds an entry to ipset
func AddToSet(fd int, lsa syscall.SockaddrNetlink, setName, entry string) {
if setName == "" {
return
@ -280,6 +283,7 @@ func rtaAlignOf(attrlen int) int {
return (attrlen + syscall.RTA_ALIGNTO - 1) & ^(syscall.RTA_ALIGNTO - 1)
}
// NetlinkRequestData .
type NetlinkRequestData interface {
Len() int
Serialize() []byte
@ -291,6 +295,7 @@ type NfGenMsg struct {
resID uint16
}
// NewNfGenMsg .
func NewNfGenMsg(nfgenFamily, version, resID int) *NfGenMsg {
return &NfGenMsg{
nfgenFamily: uint8(nfgenFamily),
@ -429,6 +434,7 @@ func (req *NetlinkRequest) Serialize() []byte {
return b
}
// AddData add data to request
func (req *NetlinkRequest) AddData(data NetlinkRequestData) {
if data != nil {
req.Data = append(req.Data, data)
@ -442,10 +448,12 @@ func (req *NetlinkRequest) AddRawData(data []byte) {
}
}
// Uint8Attr .
func Uint8Attr(v uint8) []byte {
return []byte{byte(v)}
}
// Uint16Attr .
func Uint16Attr(v uint16) []byte {
native := NativeEndian()
bytes := make([]byte, 2)
@ -453,6 +461,7 @@ func Uint16Attr(v uint16) []byte {
return bytes
}
// Uint32Attr .
func Uint32Attr(v uint32) []byte {
native := NativeEndian()
bytes := make([]byte, 4)
@ -460,6 +469,7 @@ func Uint32Attr(v uint32) []byte {
return bytes
}
// ZeroTerminated .
func ZeroTerminated(s string) []byte {
bytes := make([]byte, len(s)+1)
for i := 0; i < len(s); i++ {
@ -469,6 +479,7 @@ func ZeroTerminated(s string) []byte {
return bytes
}
// NonZeroTerminated .
func NonZeroTerminated(s string) []byte {
bytes := make([]byte, len(s))
for i := 0; i < len(s); i++ {
@ -477,6 +488,7 @@ func NonZeroTerminated(s string) []byte {
return bytes
}
// BytesToString .
func BytesToString(b []byte) string {
n := bytes.Index(b, []byte{0})
return string(b[:n])