config: add support for go-sockaddr templates for DNS recursors

DNS recursors can be added through go-sockaddr templates. Entries
are deduplicated while the order is maintained.

Originally proposed by @taylorchu

See #2932
This commit is contained in:
Frank Schroeder 2017-10-20 15:36:52 +02:00 committed by Frank Schröder
parent 3ab8b50133
commit 72bee6284d
2 changed files with 41 additions and 11 deletions

View File

@ -387,6 +387,26 @@ func (b *Builder) Build() (rt RuntimeConfig, err error) {
}
}
// expand dns recursors
uniq := map[string]bool{}
dnsRecursors := []string{}
for _, r := range c.DNSRecursors {
x, err := template.Parse(r)
if err != nil {
return RuntimeConfig{}, fmt.Errorf("Invalid DNS recursor template %q: %s", r, err)
}
for _, addr := range strings.Fields(x) {
if strings.HasPrefix(addr, "unix://") {
return RuntimeConfig{}, fmt.Errorf("DNS Recursors cannot be unix sockets: %s", addr)
}
if uniq[addr] {
continue
}
uniq[addr] = true
dnsRecursors = append(dnsRecursors, addr)
}
}
// Create the default set of tagged addresses.
if c.TaggedAddresses == nil {
c.TaggedAddresses = make(map[string]string)
@ -525,7 +545,7 @@ func (b *Builder) Build() (rt RuntimeConfig, err error) {
DNSOnlyPassing: b.boolVal(c.DNS.OnlyPassing),
DNSPort: dnsPort,
DNSRecursorTimeout: b.durationVal("recursor_timeout", c.DNS.RecursorTimeout),
DNSRecursors: c.DNSRecursors,
DNSRecursors: dnsRecursors,
DNSServiceTTL: dnsServiceTTL,
DNSUDPAnswerLimit: b.intVal(c.DNS.UDPAnswerLimit),

View File

@ -445,12 +445,12 @@ func TestConfigFlagsAndEdgecases(t *testing.T) {
{
desc: "-recursor",
flags: []string{
`-recursor=a`,
`-recursor=b`,
`-recursor=1.2.3.4`,
`-recursor=5.6.7.8`,
`-data-dir=` + dataDir,
},
patch: func(rt *RuntimeConfig) {
rt.DNSRecursors = []string{"a", "b"}
rt.DNSRecursors = []string{"1.2.3.4", "5.6.7.8"}
rt.DataDir = dataDir
},
},
@ -988,6 +988,16 @@ func TestConfigFlagsAndEdgecases(t *testing.T) {
rt.DataDir = dataDir
},
},
{
desc: "dns recursor templates with deduplication",
flags: []string{`-data-dir=` + dataDir},
json: []string{`{ "recursors": [ "{{ printf \"5.6.7.8:9999\" }}", "{{ printf \"1.2.3.4\" }}", "{{ printf \"5.6.7.8:9999\" }}" ] }`},
hcl: []string{`recursors = [ "{{ printf \"5.6.7.8:9999\" }}", "{{ printf \"1.2.3.4\" }}", "{{ printf \"5.6.7.8:9999\" }}" ] `},
patch: func(rt *RuntimeConfig) {
rt.DNSRecursors = []string{"5.6.7.8:9999", "1.2.3.4"}
rt.DataDir = dataDir
},
},
// ------------------------------------------------------------
// precedence rules
@ -1047,7 +1057,7 @@ func TestConfigFlagsAndEdgecases(t *testing.T) {
"bootstrap_expect": 3,
"datacenter":"a",
"node_meta": {"a":"b"},
"recursors":["a", "b"],
"recursors":["1.2.3.5", "5.6.7.9"],
"serf_lan": "a",
"serf_wan": "a",
"start_join":["a", "b"]
@ -1061,7 +1071,7 @@ func TestConfigFlagsAndEdgecases(t *testing.T) {
bootstrap_expect = 3
datacenter = "a"
node_meta = { "a" = "b" }
recursors = ["a", "b"]
recursors = ["1.2.3.5", "5.6.7.9"]
serf_lan = "a"
serf_wan = "a"
start_join = ["a", "b"]
@ -1076,7 +1086,7 @@ func TestConfigFlagsAndEdgecases(t *testing.T) {
`-data-dir=` + dataDir,
`-join`, `c`, `-join=d`,
`-node-meta=c:d`,
`-recursor`, `c`, `-recursor=d`,
`-recursor`, `1.2.3.6`, `-recursor=5.6.7.10`,
`-serf-lan-bind=3.3.3.3`,
`-serf-wan-bind=4.4.4.4`,
},
@ -1087,7 +1097,7 @@ func TestConfigFlagsAndEdgecases(t *testing.T) {
rt.SerfAdvertiseAddrLAN = tcpAddr("1.1.1.1:8301")
rt.SerfAdvertiseAddrWAN = tcpAddr("2.2.2.2:8302")
rt.Datacenter = "b"
rt.DNSRecursors = []string{"c", "d", "a", "b"}
rt.DNSRecursors = []string{"1.2.3.6", "5.6.7.10", "1.2.3.5", "5.6.7.9"}
rt.NodeMeta = map[string]string{"c": "d"}
rt.SerfBindAddrLAN = tcpAddr("3.3.3.3:8301")
rt.SerfBindAddrWAN = tcpAddr("4.4.4.4:8302")
@ -2175,7 +2185,7 @@ func TestFullConfig(t *testing.T) {
"raft_protocol": 19016,
"reconnect_timeout": "23739s",
"reconnect_timeout_wan": "26694s",
"recursors": [ "FtFhoUHl", "UYkwck1k" ],
"recursors": [ "63.38.39.58", "92.49.18.18" ],
"rejoin_after_leave": true,
"retry_interval": "8067s",
"retry_interval_wan": "28866s",
@ -2609,7 +2619,7 @@ func TestFullConfig(t *testing.T) {
raft_protocol = 19016
reconnect_timeout = "23739s"
reconnect_timeout_wan = "26694s"
recursors = [ "FtFhoUHl", "UYkwck1k" ]
recursors = [ "63.38.39.58", "92.49.18.18" ]
rejoin_after_leave = true
retry_interval = "8067s"
retry_interval_wan = "28866s"
@ -3122,7 +3132,7 @@ func TestFullConfig(t *testing.T) {
DNSOnlyPassing: true,
DNSPort: 7001,
DNSRecursorTimeout: 4427 * time.Second,
DNSRecursors: []string{"FtFhoUHl", "UYkwck1k"},
DNSRecursors: []string{"63.38.39.58", "92.49.18.18"},
DNSServiceTTL: map[string]time.Duration{"*": 32030 * time.Second},
DNSUDPAnswerLimit: 29909,
DataDir: dataDir,