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client_names_resolver_test.go
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client_names_resolver_test.go
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package resolver
import (
"errors"
"net"
"github.com/0xERR0R/blocky/config"
. "github.com/0xERR0R/blocky/model"
"github.com/miekg/dns"
. "github.com/onsi/ginkgo/v2"
. "github.com/onsi/gomega"
"github.com/stretchr/testify/mock"
)
var _ = Describe("ClientResolver", Label("clientNamesResolver"), func() {
var (
sut *ClientNamesResolver
sutConfig config.ClientLookupConfig
m *mockResolver
)
JustBeforeEach(func() {
res, err := NewClientNamesResolver(sutConfig, nil, false)
Expect(err).Should(Succeed())
sut = res
m = &mockResolver{}
m.On("Resolve", mock.Anything).Return(&Response{Res: new(dns.Msg)}, nil)
sut.Next(m)
})
Describe("Resolve client name from request clientID", func() {
BeforeEach(func() {
sutConfig = config.ClientLookupConfig{}
})
AfterEach(func() {
// next resolver will be called
m.AssertExpectations(GinkgoT())
})
It("should use clientID if set", func() {
request := newRequestWithClientID("google1.de.", dns.Type(dns.TypeA), "1.2.3.4", "client123")
resp, err := sut.Resolve(request)
Expect(err).Should(Succeed())
Expect(resp.Res.Rcode).Should(Equal(dns.RcodeSuccess))
Expect(request.ClientNames).Should(HaveLen(1))
Expect(request.ClientNames[0]).Should(Equal("client123"))
})
It("should use IP as fallback if clientID not set", func() {
request := newRequestWithClientID("google2.de.", dns.Type(dns.TypeA), "1.2.3.4", "")
resp, err := sut.Resolve(request)
Expect(err).Should(Succeed())
Expect(resp.Res.Rcode).Should(Equal(dns.RcodeSuccess))
Expect(request.ClientNames).Should(HaveLen(1))
Expect(request.ClientNames[0]).Should(Equal("1.2.3.4"))
})
})
Describe("Resolve client name with custom name mapping", Label("XXX"), func() {
BeforeEach(func() {
sutConfig = config.ClientLookupConfig{
ClientnameIPMapping: map[string][]net.IP{
"client7": {
net.ParseIP("1.2.3.4"), net.ParseIP("1.2.3.5"), net.ParseIP("2a02:590:505:4700:2e4f:1503:ce74:df78"),
},
"client8": {
net.ParseIP("1.2.3.5"),
},
},
}
})
AfterEach(func() {
// next resolver will be called
m.AssertExpectations(GinkgoT())
})
It("should resolve defined name with ipv4 address", func() {
request := newRequestWithClient("google.de.", dns.Type(dns.TypeA), "1.2.3.4")
resp, err := sut.Resolve(request)
Expect(err).Should(Succeed())
Expect(resp.Res.Rcode).Should(Equal(dns.RcodeSuccess))
Expect(request.ClientNames).Should(HaveLen(1))
Expect(request.ClientNames[0]).Should(Equal("client7"))
})
It("should resolve defined name with ipv6 address", func() {
request := newRequestWithClient("google.de.", dns.Type(dns.TypeA), "2a02:590:505:4700:2e4f:1503:ce74:df78")
resp, err := sut.Resolve(request)
Expect(err).Should(Succeed())
Expect(resp.Res.Rcode).Should(Equal(dns.RcodeSuccess))
Expect(request.ClientNames).Should(HaveLen(1))
Expect(request.ClientNames[0]).Should(Equal("client7"))
})
It("should resolve multiple names defined names", func() {
request := newRequestWithClient("google.de.", dns.Type(dns.TypeA), "1.2.3.5")
resp, err := sut.Resolve(request)
Expect(err).Should(Succeed())
Expect(resp.Res.Rcode).Should(Equal(dns.RcodeSuccess))
Expect(request.ClientNames).Should(HaveLen(2))
Expect(request.ClientNames).Should(ContainElements("client7", "client8"))
})
})
Describe("Resolve client name via rDNS lookup", func() {
var testUpstream *MockUDPUpstreamServer
AfterEach(func() {
// next resolver will be called
m.AssertExpectations(GinkgoT())
})
Context("Without order", func() {
When("Client has one name", func() {
BeforeEach(func() {
testUpstream = NewMockUDPUpstreamServer().
WithAnswerRR("25.178.168.192.in-addr.arpa. 600 IN PTR host1")
DeferCleanup(testUpstream.Close)
sutConfig = config.ClientLookupConfig{
Upstream: testUpstream.Start(),
}
})
It("should resolve client name", func() {
By("first request", func() {
request := newRequestWithClient("google.de.", dns.Type(dns.TypeA), "192.168.178.25")
resp, err := sut.Resolve(request)
Expect(err).Should(Succeed())
Expect(resp.Res.Rcode).Should(Equal(dns.RcodeSuccess))
Expect(request.ClientNames[0]).Should(Equal("host1"))
Expect(testUpstream.GetCallCount()).Should(Equal(1))
})
By("second request", func() {
request := newRequestWithClient("google.de.", dns.Type(dns.TypeA), "192.168.178.25")
resp, err := sut.Resolve(request)
Expect(err).Should(Succeed())
Expect(resp.Res.Rcode).Should(Equal(dns.RcodeSuccess))
Expect(request.ClientNames[0]).Should(Equal("host1"))
// use cache -> call count 1
Expect(testUpstream.GetCallCount()).Should(Equal(1))
})
By("reset cache", func() {
sut.FlushCache()
})
By("third request", func() {
request := newRequestWithClient("google.de.", dns.Type(dns.TypeA), "192.168.178.25")
resp, err := sut.Resolve(request)
Expect(err).Should(Succeed())
// no cache -> call count 2
Expect(testUpstream.GetCallCount()).Should(Equal(2))
Expect(resp.Res.Rcode).Should(Equal(dns.RcodeSuccess))
Expect(request.ClientNames[0]).Should(Equal("host1"))
})
})
})
When("Client has multiple names", func() {
BeforeEach(func() {
testUpstream = NewMockUDPUpstreamServer().
WithAnswerRR("25.178.168.192.in-addr.arpa. 600 IN PTR myhost1", "25.178.168.192.in-addr.arpa. 600 IN PTR myhost2")
DeferCleanup(testUpstream.Close)
sutConfig = config.ClientLookupConfig{
Upstream: testUpstream.Start(),
}
})
It("should resolve all client names", func() {
request := newRequestWithClient("google.de.", dns.Type(dns.TypeA), "192.168.178.25")
resp, err := sut.Resolve(request)
Expect(err).Should(Succeed())
Expect(resp.Res.Rcode).Should(Equal(dns.RcodeSuccess))
Expect(request.ClientNames).Should(HaveLen(2))
Expect(request.ClientNames[0]).Should(Equal("myhost1"))
Expect(request.ClientNames[1]).Should(Equal("myhost2"))
Expect(testUpstream.GetCallCount()).Should(Equal(1))
})
})
})
Context("with order", func() {
BeforeEach(func() {
sutConfig = config.ClientLookupConfig{
SingleNameOrder: []uint{2, 1},
}
})
When("Client has one name", func() {
BeforeEach(func() {
testUpstream = NewMockUDPUpstreamServer().
WithAnswerRR("25.178.168.192.in-addr.arpa. 600 IN PTR host1")
DeferCleanup(testUpstream.Close)
sutConfig.Upstream = testUpstream.Start()
})
It("should resolve client name", func() {
request := newRequestWithClient("google.de.", dns.Type(dns.TypeA), "192.168.178.25")
resp, err := sut.Resolve(request)
Expect(err).Should(Succeed())
Expect(resp.Res.Rcode).Should(Equal(dns.RcodeSuccess))
Expect(request.ClientNames[0]).Should(Equal("host1"))
Expect(testUpstream.GetCallCount()).Should(Equal(1))
})
})
When("Client has multiple names", func() {
BeforeEach(func() {
testUpstream = NewMockUDPUpstreamServer().
WithAnswerRR("25.178.168.192.in-addr.arpa. 600 IN PTR myhost1", "25.178.168.192.in-addr.arpa. 600 IN PTR myhost2")
DeferCleanup(testUpstream.Close)
sutConfig.Upstream = testUpstream.Start()
})
It("should resolve the client name depending to defined order", func() {
request := newRequestWithClient("google.de.", dns.Type(dns.TypeA), "192.168.178.25")
resp, err := sut.Resolve(request)
Expect(err).Should(Succeed())
Expect(resp.Res.Rcode).Should(Equal(dns.RcodeSuccess))
Expect(request.ClientNames).Should(HaveLen(1))
Expect(request.ClientNames[0]).Should(Equal("myhost2"))
Expect(testUpstream.GetCallCount()).Should(Equal(1))
})
})
})
Context("Error cases", func() {
When("Upstream can't resolve client name via rDNS", func() {
BeforeEach(func() {
testUpstream = NewMockUDPUpstreamServer().
WithAnswerError(dns.RcodeNameError)
DeferCleanup(testUpstream.Close)
sutConfig = config.ClientLookupConfig{
Upstream: testUpstream.Start(),
}
})
It("should use fallback for client name", func() {
request := newRequestWithClient("google.de.", dns.Type(dns.TypeA), "192.168.178.25")
resp, err := sut.Resolve(request)
Expect(err).Should(Succeed())
Expect(resp.Res.Rcode).Should(Equal(dns.RcodeSuccess))
Expect(request.ClientNames).Should(HaveLen(1))
Expect(request.ClientNames[0]).Should(Equal("192.168.178.25"))
Expect(testUpstream.GetCallCount()).Should(Equal(1))
})
})
When("Upstream produces error", func() {
BeforeEach(func() {
sutConfig = config.ClientLookupConfig{}
clientMockResolver := &mockResolver{}
clientMockResolver.On("Resolve", mock.Anything).Return(nil, errors.New("error"))
sut.externalResolver = clientMockResolver
})
It("should use fallback for client name", func() {
request := newRequestWithClient("google.de.", dns.Type(dns.TypeA), "192.168.178.25")
resp, err := sut.Resolve(request)
Expect(err).Should(Succeed())
Expect(resp.Res.Rcode).Should(Equal(dns.RcodeSuccess))
Expect(request.ClientNames).Should(HaveLen(1))
Expect(request.ClientNames[0]).Should(Equal("192.168.178.25"))
})
})
When("Client has no IP", func() {
BeforeEach(func() {
sutConfig = config.ClientLookupConfig{}
})
It("should resolve no names", func() {
request := newRequestWithClient("google.de.", dns.Type(dns.TypeA), "")
resp, err := sut.Resolve(request)
Expect(err).Should(Succeed())
Expect(resp.Res.Rcode).Should(Equal(dns.RcodeSuccess))
Expect(request.ClientNames).Should(BeEmpty())
})
})
When("No upstream is defined", func() {
BeforeEach(func() {
sutConfig = config.ClientLookupConfig{}
})
It("should use fallback for client name", func() {
request := newRequestWithClient("google.de.", dns.Type(dns.TypeA), "192.168.178.25")
resp, err := sut.Resolve(request)
Expect(err).Should(Succeed())
Expect(resp.Res.Rcode).Should(Equal(dns.RcodeSuccess))
Expect(request.ClientNames).Should(HaveLen(1))
Expect(request.ClientNames[0]).Should(Equal("192.168.178.25"))
})
})
})
})
Describe("Connstruction", func() {
When("upstream is invalid", func() {
It("errors during construction", func() {
b := newTestBootstrap(&dns.Msg{MsgHdr: dns.MsgHdr{Rcode: dns.RcodeServerFailure}})
r, err := NewClientNamesResolver(config.ClientLookupConfig{
Upstream: config.Upstream{Host: "example.com"},
}, b, true)
Expect(err).ShouldNot(Succeed())
Expect(r).Should(BeNil())
})
})
})
Describe("Configuration output", func() {
When("resolver is enabled", func() {
BeforeEach(func() {
sutConfig = config.ClientLookupConfig{
Upstream: config.Upstream{Net: config.NetProtocolTcpUdp, Host: "host"},
SingleNameOrder: []uint{1, 2},
ClientnameIPMapping: map[string][]net.IP{
"client8": {net.ParseIP("1.2.3.5")},
},
}
})
It("should return configuration", func() {
c := sut.Configuration()
Expect(len(c)).Should(BeNumerically(">", 1))
})
})
When("resolver is disabled", func() {
BeforeEach(func() {
sutConfig = config.ClientLookupConfig{}
})
It("should return 'disabled'", func() {
c := sut.Configuration()
Expect(c).Should(ContainElement(configStatusDisabled))
})
})
})
})