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open-consul
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GH-3798: More PR Updates 

Update docs a little
Update/add tests. Make sure all the various ways of determining the source IP work
Update X-Forwarded-For header parsing. This can be a comma separated list with the first element being the original IP so we now handle csv data there.
Got rid of error return from sourceAddrFromRequest
This commit is contained in:
Matt Keeler 2018-04-12 10:40:46 -04:00
parent aa9151738a
commit d604642792
5 changed files with 208 additions and 57 deletions
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2
agent/dns.go
View File

@ -918,7 +918,7 @@ func (d *DNSServer) serviceLookup(network, datacenter, service, tag string, req,
}
func ednsSubnetForRequest(req *dns.Msg) (*dns.EDNS0_SUBNET) {
// Its probably not obvious but IsEdns0 returns the EDNS RR if present or nil otherwise
// IsEdns0 returns the EDNS RR if present or nil otherwise
edns := req.IsEdns0()
if edns == nil {

164
agent/dns_test.go
View File

@ -1837,6 +1837,132 @@ func TestDNS_ServiceLookup_TagPeriod(t *testing.T) {
}
}
func TestDNS_PreparedQueryNearIPEDNS(t *testing.T) {
ipCoord := lib.GenerateCoordinate(1 * time.Millisecond)
serviceNodes := []struct{
name string
address string
coord *coordinate.Coordinate
}{
{"foo1", "198.18.0.1", lib.GenerateCoordinate(1 * time.Millisecond),},
{"foo2", "198.18.0.2", lib.GenerateCoordinate(10 * time.Millisecond),},
{"foo3", "198.18.0.3", lib.GenerateCoordinate(30 * time.Millisecond),},
}
t.Parallel()
a := NewTestAgent(t.Name(), "")
defer a.Shutdown()
added := 0
// Register nodes with a service
for _, cfg := range serviceNodes {
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: cfg.name,
Address: cfg.address,
Service: &structs.NodeService{
Service: "db",
Port: 12345,
},
}
var out struct{}
err := a.RPC("Catalog.Register", args, &out)
require.NoError(t, err)
// Send coordinate updates
coordArgs := structs.CoordinateUpdateRequest{
Datacenter: "dc1",
Node: cfg.name,
Coord: cfg.coord,
}
err = a.RPC("Coordinate.Update", &coordArgs, &out)
require.NoError(t, err)
added += 1
}
fmt.Printf("Added %d service nodes\n", added)
// Register a node without a service
{
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "bar",
Address: "198.18.0.9",
}
var out struct{}
err := a.RPC("Catalog.Register", args, &out)
require.NoError(t, err)
// Send coordinate updates for a few nodes.
coordArgs := structs.CoordinateUpdateRequest{
Datacenter: "dc1",
Node: "bar",
Coord: ipCoord,
}
err = a.RPC("Coordinate.Update", &coordArgs, &out)
require.NoError(t, err)
}
// Register a prepared query Near = _ip
{
args := &structs.PreparedQueryRequest{
Datacenter: "dc1",
Op: structs.PreparedQueryCreate,
Query: &structs.PreparedQuery{
Name: "some.query.we.like",
Service: structs.ServiceQuery{
Service: "db",
Near: "_ip",
},
},
}
var id string
err := a.RPC("PreparedQuery.Apply", args, &id)
require.NoError(t, err)
}
retry.Run(t, func(r *retry.R) {
m := new(dns.Msg)
m.SetQuestion("some.query.we.like.query.consul.", dns.TypeA)
m.SetEdns0(4096, false)
o := new(dns.OPT)
o.Hdr.Name = "."
o.Hdr.Rrtype = dns.TypeOPT
e := new(dns.EDNS0_SUBNET)
e.Code = dns.EDNS0SUBNET
e.Family = 1
e.SourceNetmask = 32
e.SourceScope = 0
e.Address = net.ParseIP("198.18.0.9").To4()
o.Option = append(o.Option, e)
m.Extra = append(m.Extra, o)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
r.Fatalf("Error with call to dns.Client.Exchange: %s", err)
}
if len(serviceNodes) != len(in.Answer) {
r.Fatalf("Expecting %d A RRs in response, Actual found was %d", len(serviceNodes), len(in.Answer))
}
for i, rr := range in.Answer {
if aRec, ok := rr.(*dns.A); ok {
if actual := aRec.A.String(); serviceNodes[i].address != actual {
r.Fatalf("Expecting A RR #%d = %s, Actual RR was %s", i, serviceNodes[i].address, actual)
}
} else {
r.Fatalf("DNS Answer contained a non-A RR")
}
}
})
}
func TestDNS_PreparedQueryNearIP(t *testing.T) {
ipCoord := lib.GenerateCoordinate(1 * time.Millisecond)
serviceNodes := []struct{
@ -1890,7 +2016,7 @@ func TestDNS_PreparedQueryNearIP(t *testing.T) {
args := &structs.RegisterRequest{
Datacenter: "dc1",
Node: "bar",
Address: "127.0.0.1",
Address: "198.18.0.9",
}
var out struct{}
@ -1925,42 +2051,6 @@ func TestDNS_PreparedQueryNearIP(t *testing.T) {
err := a.RPC("PreparedQuery.Apply", args, &id)
require.NoError(t, err)
}
retry.Run(t, func(r *retry.R) {
m := new(dns.Msg)
m.SetQuestion("some.query.we.like.query.consul.", dns.TypeA)
m.SetEdns0(4096, false)
o := new(dns.OPT)
o.Hdr.Name = "."
o.Hdr.Rrtype = dns.TypeOPT
e := new(dns.EDNS0_SUBNET)
e.Code = dns.EDNS0SUBNET
e.Family = 1
e.SourceNetmask = 32
e.SourceScope = 0
e.Address = net.ParseIP("127.0.0.1").To4()
o.Option = append(o.Option, e)
m.Extra = append(m.Extra, o)
c := new(dns.Client)
in, _, err := c.Exchange(m, a.DNSAddr())
if err != nil {
r.Fatalf("Error with call to dns.Client.Exchange: %s", err)
}
if len(serviceNodes) != len(in.Answer) {
r.Fatalf("Expecting %d A RRs in response, Actual found was %d", len(serviceNodes), len(in.Answer))
}
for i, rr := range in.Answer {
if aRec, ok := rr.(*dns.A); ok {
if actual := aRec.A.String(); serviceNodes[i].address != actual {
r.Fatalf("Expecting A RR #%d = %s, Actual RR was %s", i, serviceNodes[i].address, actual)
}
} else {
r.Fatalf("DNS Answer contained a non-A RR")
}
}
})
retry.Run(t, func(r *retry.R) {
m := new(dns.Msg)

19
agent/http.go
View File

@ -498,23 +498,26 @@ func (s *HTTPServer) parseToken(req *http.Request, token *string) {
*token = s.agent.tokens.UserToken()
}
func sourceAddrFromRequest(req *http.Request) (string, error) {
forwardHost := req.Header.Get("X-Forwarded-For")
forwardIp := net.ParseIP(forwardHost)
func sourceAddrFromRequest(req *http.Request) string {
xff := req.Header.Get("X-Forwarded-For")
forwardHosts := strings.Split(xff, ",")
if len(forwardHosts) > 0 {
forwardIp := net.ParseIP(strings.TrimSpace(forwardHosts[0]))
if forwardIp != nil {
return forwardIp.String(), nil
return forwardIp.String()
}
}
host, _, err := net.SplitHostPort(req.RemoteAddr)
if err != nil {
return "", err
return ""
}
ip := net.ParseIP(host)
if ip != nil {
return ip.String(), nil
return ip.String()
} else {
return "", fmt.Errorf("Could not get remote IP from HTTP Request")
return ""
}
}
@ -524,7 +527,7 @@ func sourceAddrFromRequest(req *http.Request) (string, error) {
// DC in the request, if given, or else the agent's DC.
func (s *HTTPServer) parseSource(req *http.Request, source *structs.QuerySource) {
s.parseDC(req, &source.Datacenter)
source.Ip, _ = sourceAddrFromRequest(req)
source.Ip = sourceAddrFromRequest(req)
if node := req.URL.Query().Get("near"); node != "" {
if node == "_agent" {
source.Node = s.agent.config.NodeName

59
agent/prepared_query_endpoint_test.go
View File

@ -380,9 +380,66 @@ func TestPreparedQuery_Execute(t *testing.T) {
if r.Failovers != 99 {
t.Fatalf("bad: %v", r)
}
})
t.Run("", func(t *testing.T) {
a := NewTestAgent(t.Name(), "")
defer a.Shutdown()
m := MockPreparedQuery{
executeFn: func(args *structs.PreparedQueryExecuteRequest, reply *structs.PreparedQueryExecuteResponse) error {
expected := &structs.PreparedQueryExecuteRequest{
Datacenter: "dc1",
QueryIDOrName: "my-id",
Limit: 5,
Source: structs.QuerySource{
Datacenter: "dc1",
Node: "_ip",
Ip: "198.18.0.1",
},
Agent: structs.QuerySource{
Datacenter: a.Config.Datacenter,
Node: a.Config.NodeName,
},
QueryOptions: structs.QueryOptions{
Token: "my-token",
RequireConsistent: true,
},
}
if !reflect.DeepEqual(args, expected) {
t.Fatalf("bad: %v", args)
}
// Just set something so we can tell this is returned.
reply.Failovers = 99
return nil
},
}
if err := a.registerEndpoint("PreparedQuery", &m); err != nil {
t.Fatalf("err: %v", err)
}
body := bytes.NewBuffer(nil)
req, _ := http.NewRequest("GET", "/v1/query/my-id/execute?token=my-token&consistent=true&near=_ip&limit=5", body)
req.Header.Add("X-Forwarded-For", "198.18.0.1")
resp := httptest.NewRecorder()
obj, err := a.srv.PreparedQuerySpecific(resp, req)
if err != nil {
t.Fatalf("err: %v", err)
}
if resp.Code != 200 {
t.Fatalf("bad code: %d", resp.Code)
}
r, ok := obj.(structs.PreparedQueryExecuteResponse)
if !ok {
t.Fatalf("unexpected: %T", obj)
}
if r.Failovers != 99 {
t.Fatalf("bad: %v", r)
}
req, _ = http.NewRequest("GET", "/v1/query/my-id/execute?token=my-token&consistent=true&near=_ip&limit=5", body)
req.RemoteAddr = "127.0.0.1:12345"
req.Header.Add("X-Forwarded-For", "198.18.0.1, 198.19.0.1")
resp = httptest.NewRecorder()
obj, err = a.srv.PreparedQuerySpecific(resp, req)
if err != nil {

17
website/source/api/query.html.md
View File

@ -176,14 +176,15 @@ The table below shows this endpoint's support for
nearest instance to the specified node will be returned first, and subsequent
nodes in the response will be sorted in ascending order of estimated
round-trip times. If the node given does not exist, the nodes in the response
will be shuffled. Using `_agent` is supported, and will automatically return
results nearest the agent servicing the request. Using `_ip` is supported and
will automatically return results nearest to the node associated with the
source IP where the query is executed from. For HTTP the source IP is the
remote peer's IP address or the value of the X-Forwarded-For header with the
header taking precedence. For DNS the source IP is the value of the EDNS
client IP or the remote peer's IP address. If unspecified, the response
will be shuffled by default.
will be shuffled. If unspecified, the response will be shuffled by default.
- `_agent` - Returns results nearest the agent servicing the request.
- `_ip` - Returns results nearest to the node associated with the source IP
where the query was executed from. For HTTP the source IP is the remote
peer's IP address or the value of the X-Forwarded-For header with the
header taking precedence. For DNS the source IP is the remote peer's IP
address or the value of the ENDS client IP with the EDNS client IP
taking precedence.
- `Service` `(Service: <required>)` - Specifies the structure to define the query's behavior.