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/*
Performs DNS queries on TCP and UDP
*/
package main
import (
"os"
"reflect"
"strconv"
"time"
"go.wit.com/gui"
"go.wit.com/lib/gadgets"
"go.wit.com/log"
"github.com/miekg/dns"
)
type resolverStatus struct {
title string
server string // The DNS server. Example: "127.0.0.1:53" or "1.1.1.1:53"
hostname string // the hostname to lookup. Example: "www.google.com" or "go.wit.com"
parent *gui.Node
group *gui.Node
grid *gui.Node
// DNS setup options
udpA *gui.Node
tcpA *gui.Node
udpAAAA *gui.Node
tcpAAAA *gui.Node
// show the display
aFail *gui.Node
aSuccess *gui.Node
aaaaFail *gui.Node
aaaaSuccess *gui.Node
// interger counters
aFailc int
aSuccessc int
aaaaFailc int
aaaaSuccessc int
}
func (rs *resolverStatus) set(a any, s string) {
if a == nil {
return
}
var n *gui.Node
if reflect.TypeOf(a) == reflect.TypeOf(n) {
n = a.(*gui.Node)
n.SetText(s)
return
}
var ol *gadgets.OneLiner
if reflect.TypeOf(a) == reflect.TypeOf(ol) {
ol = a.(*gadgets.OneLiner)
ol.SetText(s)
return
}
log.Warn("unknown type TypeOf(a) =", reflect.TypeOf(a), "a =", a)
os.Exit(0)
}
// Makes a DNS Status Grid
func NewResolverStatus(p *gui.Node, title string, server string, hostname string) *resolverStatus {
var rs *resolverStatus
rs = new(resolverStatus)
rs.parent = p
rs.group = p.NewGroup(server + " " + title + " lookup")
rs.group = rs.group.NewBox("bw vbox", false)
rs.grid = rs.group.NewGrid("LookupStatus", 5, 2)
rs.server = server
rs.hostname = hostname
rs.grid.NewLabel("")
rs.grid.NewLabel("UDP")
rs.grid.NewLabel("TCP")
rs.grid.NewLabel("Success")
rs.grid.NewLabel("Fail")
rs.grid.NewLabel("A")
rs.udpA = rs.grid.NewLabel("?")
rs.tcpA = rs.grid.NewLabel("?")
rs.aSuccess = rs.grid.NewLabel("?")
rs.aFail = rs.grid.NewLabel("?")
rs.grid.NewLabel("AAAA")
rs.udpAAAA = rs.grid.NewLabel("?")
rs.tcpAAAA = rs.grid.NewLabel("?")
rs.aaaaSuccess = rs.grid.NewLabel("?")
rs.aaaaFail = rs.grid.NewLabel("?")
rs.group.Margin()
rs.grid.Margin()
rs.group.Pad()
rs.grid.Pad()
return rs
}
// special thanks to the Element Hotel wifi in Philidelphia that allowed me to
// easily debug this code since the internet connection here blocks port 53 traffic
func (rs *resolverStatus) update() (bool, bool) {
var results []string
var a bool = false
var aaaa bool = false
log.Log(DNS, "resolverStatus.update() For server", rs.server, "on", rs.hostname)
results, _ = dnsUdpLookup(rs.server, rs.hostname, dns.TypeA)
log.Log(DNS, "resolverStatus.update() UDP type A =", results)
if len(results) == 0 {
rs.set(rs.udpA, "BROKEN")
rs.aFailc += 1
} else {
rs.set(rs.udpA, "WORKING")
rs.aSuccessc += 1
a = true
}
results, _ = dnsTcpLookup(rs.server, rs.hostname, dns.TypeA)
log.Log(DNS, "resolverStatus.update() TCP type A =", results)
if len(results) == 0 {
rs.set(rs.tcpA, "BROKEN")
rs.aFailc += 1
} else {
me.digStatus.set(rs.tcpA, "WORKING")
rs.aSuccessc += 1
a = true
}
me.digStatus.set(rs.aFail, strconv.Itoa(rs.aFailc))
me.digStatus.set(rs.aSuccess, strconv.Itoa(rs.aSuccessc))
results, _ = dnsUdpLookup(rs.server, rs.hostname, dns.TypeAAAA)
log.Log(DNS, "resolverStatus.update() UDP type AAAA =", results)
if len(results) == 0 {
me.digStatus.set(rs.udpAAAA, "BROKEN")
rs.aaaaFailc += 1
me.digStatus.set(rs.aaaaFail, strconv.Itoa(rs.aaaaFailc))
} else {
me.digStatus.set(rs.udpAAAA, "WORKING")
rs.aaaaSuccessc += 1
aaaa = true
}
results, _ = dnsTcpLookup(rs.server, rs.hostname, dns.TypeAAAA)
log.Log(DNS, "resolverStatus.update() UDP type AAAA =", results)
if len(results) == 0 {
me.digStatus.set(rs.tcpAAAA, "BROKEN")
rs.aaaaFailc += 1
me.digStatus.set(rs.aaaaFail, strconv.Itoa(rs.aaaaFailc))
} else {
me.digStatus.set(rs.tcpAAAA, "WORKING")
rs.aaaaSuccessc += 1
aaaa = true
}
me.digStatus.set(rs.aaaaFail, strconv.Itoa(rs.aaaaFailc))
me.digStatus.set(rs.aaaaSuccess, strconv.Itoa(rs.aaaaSuccessc))
return a, aaaa
}
// dnsLookup performs a DNS lookup for the specified record type (e.g., "TXT", "AAAA") for a given domain.
func dnsUdpLookup(server string, domain string, recordType uint16) ([]string, error) {
var records []string
c := new(dns.Client)
m := new(dns.Msg)
m.SetQuestion(dns.Fqdn(domain), recordType)
r, _, err := c.Exchange(m, server) // If server = "1.1.1.1:53" then use Cloudflare's DNS server
if err != nil {
return nil, err
}
for _, ans := range r.Answer {
records = append(records, ans.String())
}
return records, nil
}
func dnsTcpLookup(server string, domain string, recordType uint16) ([]string, error) {
var records []string
c := new(dns.Client)
c.Net = "tcp" // Specify to use TCP for the query
c.Timeout = time.Second * 5 // Set a 5-second timeout
m := new(dns.Msg)
m.SetQuestion(dns.Fqdn(domain), recordType)
r, _, err := c.Exchange(m, server) // If server = "1.1.1.1:53" then use Cloudflare's DNS server
if err != nil {
return nil, err
}
for _, ans := range r.Answer {
records = append(records, ans.String())
}
return records, nil
}
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