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ipn/ipnlocal: put DNS suffixes of shared nodes as split DNS routes

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Updates #3756
Updates #3767

Co-authored-by: Mihai Parparita <mihai@tailscale.com>
Change-Id: I049ffa7e7dce3d7a7ee4c6aa37f7d4ceefd1ff9d
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2022-07-13 13:39:25 -07:00
parent ec4f849079
commit 6f2d585b44
1 changed files with 36 additions and 15 deletions
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29
ipn/ipnlocal/local.go
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@ -2580,17 +2580,22 @@ func (b *LocalBackend) initPeerAPIListener() {
} }
// magicDNSRootDomains returns the subset of nm.DNS.Domains that are the search domains for MagicDNS. // magicDNSRootDomains returns the subset of nm.DNS.Domains that are the search domains for MagicDNS.
func magicDNSRootDomains(nm *netmap.NetworkMap) []dnsname.FQDN { func magicDNSRootDomains(nm *netmap.NetworkMap) (ret []dnsname.FQDN) {
if v := nm.MagicDNSSuffix(); v != "" { v := nm.MagicDNSSuffix()
if v == "" {
return nil
}
seen := map[dnsname.FQDN]bool{}
fqdn, err := dnsname.ToFQDN(v) fqdn, err := dnsname.ToFQDN(v)
if err != nil { if err != nil {
// TODO: propagate error // TODO: propagate error
return nil return nil
} }
ret := []dnsname.FQDN{ ret = []dnsname.FQDN{
fqdn, fqdn,
dnsname.FQDN("0.e.1.a.c.5.1.1.a.7.d.f.ip6.arpa."), dnsname.FQDN("0.e.1.a.c.5.1.1.a.7.d.f.ip6.arpa."),
} }
seen[fqdn] = true
for i := 64; i <= 127; i++ { for i := 64; i <= 127; i++ {
fqdn, err = dnsname.ToFQDN(fmt.Sprintf("%d.100.in-addr.arpa.", i)) fqdn, err = dnsname.ToFQDN(fmt.Sprintf("%d.100.in-addr.arpa.", i))
if err != nil { if err != nil {
@ -2599,9 +2604,25 @@ func magicDNSRootDomains(nm *netmap.NetworkMap) []dnsname.FQDN {
} }
ret = append(ret, fqdn) ret = append(ret, fqdn)
} }
for _, p := range nm.Peers {
if p.Sharer == 0 {
// continue
}
if fqdn, ok := magicDNSSuffix(p); ok && !seen[fqdn] {
seen[fqdn] = true
ret = append(ret, fqdn)
}
}
return ret return ret
} }
return nil
func magicDNSSuffix(p *tailcfg.Node) (dnsname.FQDN, bool) {
if _, rest, ok := strings.Cut(p.Name, "."); ok {
if fqdn, err := dnsname.ToFQDN(rest); err == nil {
return fqdn, true
}
}
return "", false
} }
var ( var (