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main_test.go
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main_test.go
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package main
import (
"net"
"os"
"testing"
"github.com/stretchr/testify/assert"
)
func TestQueryPacket(t *testing.T) {
testcases := []struct {
name string
filePath string
expectedDnsHeader DnsHeader
expectedDnsQuestions []DnsQuestion
}{
{
name: "google.com",
filePath: "testdata/query_packet_google.bin",
expectedDnsHeader: DnsHeader{
id: 12877,
recursionDesired: true,
truncatedMessage: false,
authoritativeAnswer: false,
opcode: 0,
response: false,
resCode: NoError,
checkingDisabled: false,
authedData: true,
z: false,
recursionAvailable: false,
questions: 1,
answers: 0,
authoritativeEntries: 0,
resourceEntries: 0,
},
expectedDnsQuestions: []DnsQuestion{
{
name: "google.com",
qtype: A,
},
},
},
{
name: "yahoo.com",
filePath: "testdata/query_packet_yahoo.bin",
expectedDnsHeader: DnsHeader{
id: 3035,
recursionDesired: true,
truncatedMessage: false,
authoritativeAnswer: false,
opcode: 0,
response: false,
resCode: NoError,
checkingDisabled: false,
authedData: true,
z: false,
recursionAvailable: false,
questions: 1,
answers: 0,
authoritativeEntries: 0,
resourceEntries: 0,
},
expectedDnsQuestions: []DnsQuestion{
{
name: "www.yahoo.com",
qtype: A,
},
},
},
}
for _, tc := range testcases {
t.Run(tc.name, func(t *testing.T) {
f, err := os.Open(tc.filePath)
assert.NoError(t, err)
buf := NewBytePacketBuffer()
_, err = f.Read(buf.buf)
assert.NoError(t, err)
packet := NewDnsPacket()
err = packet.fromBuffer(buf)
assert.NoError(t, err)
assert.Equal(t, tc.expectedDnsHeader, packet.header)
assert.Equal(t, tc.expectedDnsQuestions, packet.questions)
})
}
}
func TestResponsePacket(t *testing.T) {
testcases := []struct {
name string
filePath string
expectedDnsHeader DnsHeader
expectedDnsQuestions []DnsQuestion
expectedDnsRecords []DnsRecord
}{
{
name: "google.com",
filePath: "testdata/response_packet_google.bin",
expectedDnsHeader: DnsHeader{
id: 12877,
recursionDesired: true,
truncatedMessage: false,
authoritativeAnswer: false,
opcode: 0,
response: true,
resCode: NoError,
checkingDisabled: false,
authedData: false,
z: false,
recursionAvailable: true,
questions: 1,
answers: 1,
authoritativeEntries: 0,
resourceEntries: 0,
},
expectedDnsQuestions: []DnsQuestion{
{
name: "google.com",
qtype: A,
},
},
expectedDnsRecords: []DnsRecord{
{
domain: "google.com",
addr: "142.250.196.110",
ttl: 116,
qType: A,
},
},
},
{
name: "yahoo.com",
filePath: "testdata/response_packet_yahoo.bin",
expectedDnsHeader: DnsHeader{
id: 3035,
recursionDesired: true,
truncatedMessage: false,
authoritativeAnswer: false,
opcode: 0,
response: true,
resCode: NoError,
checkingDisabled: false,
authedData: false,
z: false,
recursionAvailable: true,
questions: 1,
answers: 3,
authoritativeEntries: 0,
resourceEntries: 0,
},
expectedDnsQuestions: []DnsQuestion{
{
name: "www.yahoo.com",
qtype: A,
},
},
expectedDnsRecords: []DnsRecord{
{
domain: "www.yahoo.com",
host: "me-ycpi-cf-www.g06.yahoodns.net",
ttl: 60,
qType: CNAME,
},
{
domain: "me-ycpi-cf-www.g06.yahoodns.net",
addr: "180.222.119.248",
ttl: 30,
qType: A,
},
{
domain: "me-ycpi-cf-www.g06.yahoodns.net",
addr: "180.222.119.247",
ttl: 30,
qType: A,
},
},
},
{
name: "ns record response",
filePath: "testdata/response_packet_ns.bin",
expectedDnsHeader: DnsHeader{
id: 7048,
recursionDesired: true,
truncatedMessage: false,
authoritativeAnswer: false,
opcode: 0,
response: true,
resCode: NoError,
checkingDisabled: false,
authedData: false,
z: false,
recursionAvailable: true,
questions: 1,
answers: 4,
authoritativeEntries: 0,
resourceEntries: 0,
},
expectedDnsQuestions: []DnsQuestion{
{
name: "google.com",
qtype: NS,
},
},
expectedDnsRecords: []DnsRecord{
{
domain: "google.com",
host: "ns1.google.com",
ttl: 14133,
qType: NS,
},
{
domain: "google.com",
host: "ns4.google.com",
ttl: 14133,
qType: NS,
},
{
domain: "google.com",
host: "ns3.google.com",
ttl: 14133,
qType: NS,
},
{
domain: "google.com",
host: "ns2.google.com",
ttl: 14133,
qType: NS,
},
},
},
{
name: "mx record response",
filePath: "testdata/response_packet_mx.bin",
expectedDnsHeader: DnsHeader{
id: 1874,
recursionDesired: true,
truncatedMessage: false,
authoritativeAnswer: false,
opcode: 0,
response: true,
resCode: NoError,
checkingDisabled: false,
authedData: false,
z: false,
recursionAvailable: true,
questions: 1,
answers: 1,
authoritativeEntries: 0,
resourceEntries: 0,
},
expectedDnsQuestions: []DnsQuestion{
{
name: "google.com",
qtype: MX,
},
},
expectedDnsRecords: []DnsRecord{
{
domain: "google.com",
host: "smtp.google.com",
ttl: 210,
qType: MX,
priority: 10,
},
},
},
{
name: "mx record response",
filePath: "testdata/response_packet_aaaa.bin",
expectedDnsHeader: DnsHeader{
id: 20097,
recursionDesired: true,
truncatedMessage: false,
authoritativeAnswer: false,
opcode: 0,
response: true,
resCode: NoError,
checkingDisabled: false,
authedData: false,
z: false,
recursionAvailable: true,
questions: 1,
answers: 1,
authoritativeEntries: 0,
resourceEntries: 0,
},
expectedDnsQuestions: []DnsQuestion{
{
name: "google.com",
qtype: AAAA,
},
},
expectedDnsRecords: []DnsRecord{
{
domain: "google.com",
addr: "2404:6800:4004:824:0:0:0:200e",
ttl: 26,
qType: AAAA,
},
},
},
}
for _, tc := range testcases {
t.Run(tc.name, func(t *testing.T) {
f, err := os.Open(tc.filePath)
assert.NoError(t, err)
buf := NewBytePacketBuffer()
_, err = f.Read(buf.buf)
assert.NoError(t, err)
packet := NewDnsPacket()
err = packet.fromBuffer(buf)
assert.NoError(t, err)
assert.Equal(t, tc.expectedDnsHeader, packet.header)
assert.Equal(t, tc.expectedDnsQuestions, packet.questions)
assert.Equal(t, tc.expectedDnsRecords, packet.answers)
})
}
}
func TestDNSServer(t *testing.T) {
testcases := []struct {
name string
domainName string
}{
{name: "yahoo", domainName: "www.yahoo.com"},
{name: "google", domainName: "www.google.com"},
{name: "facebook", domainName: "www.facebook.com"},
}
for _, tc := range testcases {
t.Run(tc.name, func(t *testing.T) {
udpAddr, err := net.ResolveUDPAddr("udp", "8.8.8.8:53")
if err != nil {
t.Errorf("error resolving address: %v", err)
}
conn, err := net.DialUDP("udp", nil, udpAddr)
if err != nil {
t.Errorf("error dialing: %v", err)
}
defer conn.Close()
packet := NewDnsPacket()
packet.header = DnsHeader{
id: 1234,
questions: 1,
recursionDesired: true,
}
packet.questions = []DnsQuestion{{name: tc.domainName, qtype: A}}
requestBuf := NewBytePacketBuffer()
err = packet.write(requestBuf)
assert.NoError(t, err)
_, err = conn.Write(requestBuf.buf[0:requestBuf.pos])
assert.NoError(t, err)
responseBuf := NewBytePacketBuffer()
_, _, err = conn.ReadFromUDP(responseBuf.buf)
assert.NoError(t, err)
resPacket := NewDnsPacket()
err = resPacket.fromBuffer(responseBuf)
assert.NoError(t, err)
})
}
}