45 lines
947 B
Go
45 lines
947 B
Go
package chain
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"net"
|
|
|
|
"github.com/go-gost/core/hosts"
|
|
"github.com/go-gost/core/logger"
|
|
"github.com/go-gost/core/resolver"
|
|
)
|
|
|
|
func Resolve(ctx context.Context, network, addr string, r resolver.Resolver, hosts hosts.HostMapper, log logger.Logger) (string, error) {
|
|
if addr == "" {
|
|
return addr, nil
|
|
}
|
|
|
|
host, port, _ := net.SplitHostPort(addr)
|
|
if host == "" {
|
|
return addr, nil
|
|
}
|
|
|
|
if hosts != nil {
|
|
if ips, _ := hosts.Lookup(ctx, network, host); len(ips) > 0 {
|
|
log.Debugf("hit host mapper: %s -> %s", host, ips)
|
|
return net.JoinHostPort(ips[0].String(), port), nil
|
|
}
|
|
}
|
|
|
|
if r != nil {
|
|
ips, err := r.Resolve(ctx, network, host)
|
|
if err != nil {
|
|
if err == resolver.ErrInvalid {
|
|
return addr, nil
|
|
}
|
|
log.Error(err)
|
|
}
|
|
if len(ips) == 0 {
|
|
return "", fmt.Errorf("resolver: domain %s does not exist", host)
|
|
}
|
|
return net.JoinHostPort(ips[0].String(), port), nil
|
|
}
|
|
return addr, nil
|
|
}
|