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hosts.go
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hosts.go
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package resolver
import (
"context"
"net"
"strings"
"github.com/Asutorufa/yuhaiin/pkg/net/netapi"
"github.com/Asutorufa/yuhaiin/pkg/protos/config"
"github.com/Asutorufa/yuhaiin/pkg/utils/yerror"
"golang.org/x/net/dns/dnsmessage"
)
type Hosts struct {
hosts map[string]*hostsEntry
dialer netapi.Proxy
resolver netapi.Resolver
}
type hostsEntry struct {
V netapi.Address
portMap map[uint16]netapi.Address
}
func NewHosts(dialer netapi.Proxy, resolver netapi.Resolver) *Hosts {
return &Hosts{dialer: dialer, resolver: resolver, hosts: map[string]*hostsEntry{}}
}
func (h *Hosts) Update(c *config.Setting) {
store := map[string]*hostsEntry{}
for k, v := range c.Dns.Hosts {
_, _, e1 := net.SplitHostPort(k)
_, _, e2 := net.SplitHostPort(v)
if e1 == nil && e2 == nil {
kaddr, err1 := netapi.ParseAddress(0, k)
addr, err2 := netapi.ParseAddress(0, v)
if err1 == nil && err2 == nil && kaddr.Port().Port() != 0 && addr.Port().Port() != 0 {
v, ok := store[kaddr.Hostname()]
if !ok {
v = &hostsEntry{}
store[kaddr.Hostname()] = v
}
if v.portMap == nil {
v.portMap = map[uint16]netapi.Address{}
}
v.portMap[kaddr.Port().Port()] = addr
}
}
if e1 != nil && e2 != nil {
he, ok := store[k]
if !ok {
he = &hostsEntry{}
store[k] = he
}
he.V = netapi.ParseAddressPort(0, v, netapi.EmptyPort)
}
}
h.hosts = store
}
func (h *Hosts) Dispatch(ctx context.Context, addr netapi.Address) (netapi.Address, error) {
haddr := h.dispatchAddr(ctx, addr)
return h.dialer.Dispatch(ctx, haddr)
}
func (h *Hosts) Conn(ctx context.Context, addr netapi.Address) (net.Conn, error) {
return h.dialer.Conn(ctx, h.dispatchAddr(ctx, addr))
}
func (h *Hosts) PacketConn(ctx context.Context, addr netapi.Address) (net.PacketConn, error) {
c, err := h.dialer.PacketConn(ctx, h.dispatchAddr(ctx, addr))
if err != nil {
return nil, err
}
return &dispatchPacketConn{c, h.dispatchAddr}, nil
}
func (h *Hosts) dispatchAddr(ctx context.Context, addr netapi.Address) netapi.Address {
v, ok := h.hosts[addr.Hostname()]
if !ok {
return addr
}
if v.portMap != nil {
z, ok := v.portMap[addr.Port().Port()]
if ok {
store := netapi.StoreFromContext(ctx)
store.Add("Hosts", addr.String())
addr = addr.OverrideHostname(z.Hostname()).OverridePort(z.Port())
store.Add(netapi.CurrentKey{}, addr)
return addr
}
}
if v.V == nil {
return addr
}
netapi.StoreFromContext(ctx).
Add("Hosts", addr.Hostname()).
Add(netapi.CurrentKey{}, addr)
return addr.OverrideHostname(v.V.Hostname())
}
func (h *Hosts) LookupIP(ctx context.Context, domain string, opts ...func(*netapi.LookupIPOption)) ([]net.IP, error) {
addr := h.dispatchAddr(ctx, netapi.ParseAddressPort(0, domain, netapi.EmptyPort))
if addr.Type() == netapi.IP {
return []net.IP{yerror.Ignore(addr.IP(ctx))}, nil
}
return h.resolver.LookupIP(ctx, addr.Hostname(), opts...)
}
func (h *Hosts) Raw(ctx context.Context, req dnsmessage.Question) (dnsmessage.Message, error) {
addr := h.dispatchAddr(ctx, netapi.ParseAddressPort(0, strings.TrimSuffix(req.Name.String(), "."), netapi.EmptyPort))
if req.Type != dnsmessage.TypeAAAA && req.Type != dnsmessage.TypeA {
return h.resolver.Raw(ctx, req)
}
if addr.Type() != netapi.IP {
name, err := dnsmessage.NewName(addr.Hostname() + ".")
if err != nil {
return dnsmessage.Message{}, err
}
req.Name = name
return h.resolver.Raw(ctx, req)
}
msg := dnsmessage.Message{
Header: dnsmessage.Header{
ID: 0,
Response: true,
Authoritative: false,
RecursionDesired: false,
RCode: dnsmessage.RCodeSuccess,
RecursionAvailable: false,
},
Questions: []dnsmessage.Question{
{
Name: req.Name,
Type: req.Type,
Class: dnsmessage.ClassINET,
},
},
}
if req.Type == dnsmessage.TypeAAAA {
msg.Answers = []dnsmessage.Resource{
{
Header: dnsmessage.ResourceHeader{
Name: req.Name,
Class: dnsmessage.ClassINET,
TTL: 600,
Type: dnsmessage.TypeAAAA,
},
Body: &dnsmessage.AAAAResource{AAAA: [16]byte(yerror.Ignore(addr.IP(ctx)).To16())},
},
}
}
if req.Type == dnsmessage.TypeA {
msg.Answers = []dnsmessage.Resource{
{
Header: dnsmessage.ResourceHeader{
Name: req.Name,
Class: dnsmessage.ClassINET,
TTL: 600,
Type: dnsmessage.TypeA,
},
Body: &dnsmessage.AResource{A: [4]byte(yerror.Ignore(addr.IP(ctx)).To4())},
},
}
}
return msg, nil
}
func (h *Hosts) Close() error { return nil }