loop-uh
d5a4715771
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61 lines
1.7 KiB
Go
61 lines
1.7 KiB
Go
package main
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import (
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"context"
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"fmt"
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"net"
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"net/netip"
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"strings"
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"time"
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"golang.org/x/net/dns/dnsmessage"
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)
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// Only peer hostnames use physical-network bootstrap. SOCKS destinations
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// exclusively use the separate sing-box DNS delegation, with no fallback here.
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func bootstrapPeers(c *config) error {
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ctx, cancel := context.WithTimeout(context.Background(), 8*time.Second)
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defer cancel()
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dialer := &net.Dialer{Control: physicalSocketControl(c.InterfaceIndex)}
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for index := range c.Endpoint.Peers {
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peer := &c.Endpoint.Peers[index]
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if _, err := netip.ParseAddr(peer.Address); err == nil {
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continue
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}
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if len(c.BootstrapDNS) == 0 {
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return fmt.Errorf("peer[%d] bootstrap: physical network has no DNS server", index)
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}
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var last error
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resolved := false
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for _, raw := range c.BootstrapDNS {
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ip, err := netip.ParseAddr(raw)
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if err != nil || ip.IsUnspecified() || ip.IsMulticast() {
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return fmt.Errorf("invalid physical bootstrap DNS address")
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}
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for _, kind := range []dnsmessage.Type{dnsmessage.TypeA, dnsmessage.TypeAAAA} {
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queryCtx, queryCancel := context.WithTimeout(ctx, 2*time.Second)
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ips, err := lookupDNS(queryCtx, netip.AddrPortFrom(ip, 53).String(), strings.TrimSuffix(peer.Address, ".")+".", kind, dialer)
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queryCancel()
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last = err
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for _, result := range ips {
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if result.IsUnspecified() || result.IsMulticast() {
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continue
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}
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peer.Address = result.Unmap().String()
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resolved = true
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break
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}
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if resolved || ctx.Err() != nil {
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break
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}
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}
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if resolved || ctx.Err() != nil {
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break
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}
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}
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if !resolved {
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return fmt.Errorf("peer[%d] bootstrap DNS failed: %v", index, last)
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}
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}
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return nil
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}
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