Make everything more readable (#2)
1. I made JSON print indented instead of inline 2. I created a util package and moved `ReverseDNS` and `ResolveHTTPS` there 3. I created a new struct called Answers where all variables for the output live now, and adjusted the response struct to have the Answers struct in it. This lets us reuse the struct more instead of having variables floating around, lets us make the response more custom, offers more understandable code reuse, and makes things (I think) more readable. Aside: you will notice the struct has little json defs. This is because struct values encode as JSON objects and can preserve the output name this way Most of this just makes expanding on awl easier in the future. Co-authored-by: grumbulon <grumbulon@dismail.de> Reviewed-on: #2 Co-authored-by: grumbulon <grumbulon@grumbulon.xyz> Co-committed-by: grumbulon <grumbulon@grumbulon.xyz>
This commit is contained in:
parent
50d7b9dc2a
commit
9b979667d6
146
awl.go
146
awl.go
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@ -1,32 +1,21 @@
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package main
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import (
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"encoding/base64"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"net"
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"net/http"
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"os"
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"runtime"
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"strconv"
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"strings"
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"time"
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"github.com/c-robinson/iplib"
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"git.froth.zone/sam/awl/util"
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"github.com/miekg/dns"
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"github.com/urfave/cli/v2"
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"golang.org/x/net/idna"
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)
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// The basic structure of a DNS request
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type request struct {
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server string // The server to make the DNS request from
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request uint16 // The type of request
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name string // The domain name to make a DNS request for
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}
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func main() {
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// Custom version string
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cli.VersionPrinter = func(c *cli.Context) {
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@ -126,8 +115,8 @@ func main() {
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},
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Action: func(c *cli.Context) error {
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var err error
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req := parseArgs(c.Args().Slice())
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var resp util.Response
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resp.Answers = parseArgs(c.Args().Slice())
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// Set DNS-over-TLS, if enabled
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port := c.Int("port")
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@ -141,29 +130,26 @@ func main() {
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}
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if !c.Bool("https") {
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req.server = net.JoinHostPort(req.server, strconv.Itoa(port))
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resp.Answers.Server = net.JoinHostPort(resp.Answers.Server, strconv.Itoa(port))
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} else {
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req.server = "https://" + req.server
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resp.Answers.Server = "https://" + resp.Answers.Server
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}
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// Process the IP/Phone number so a PTR/NAPTR can be done
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if c.Bool("reverse") {
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if dns.TypeToString[req.request] == "A" {
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req.request = dns.StringToType["PTR"]
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}
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req.name, err = reverseDNS(req.name, dns.TypeToString[req.request])
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if err != nil {
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return err
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if dns.TypeToString[resp.Answers.Request] == "A" {
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resp.Answers.Request = dns.StringToType["PTR"]
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}
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resp.Answers.Name, err = util.ReverseDNS(resp.Answers.Name, dns.TypeToString[resp.Answers.Request])
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}
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// if the domain is not canonical, make it canonical
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if !strings.HasSuffix(req.name, ".") {
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req.name = fmt.Sprintf("%s.", req.name)
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if !strings.HasSuffix(resp.Answers.Name, ".") {
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resp.Answers.Name = fmt.Sprintf("%s.", resp.Answers.Name)
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}
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msg := new(dns.Msg)
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msg.SetQuestion(req.name, req.request)
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msg.SetQuestion(resp.Answers.Name, resp.Answers.Request)
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// Set DNSSEC if requested
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if c.Bool("dnssec") {
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@ -171,13 +157,12 @@ func main() {
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}
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var (
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in *dns.Msg
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rtt time.Duration
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in *dns.Msg
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)
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// Make the DNS request
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if c.Bool("https") {
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in, err = resolveHTTPS(msg, req.server)
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in, err = util.ResolveHTTPS(msg, resp.Answers.Server)
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} else if c.Bool("quic") {
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return fmt.Errorf("quic: not yet implemented")
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} else {
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@ -208,7 +193,7 @@ func main() {
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if c.Bool("tls") {
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d.Net = "tcp-tls"
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}
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in, rtt, err = d.Exchange(msg, req.server)
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in, resp.Answers.RTT, err = d.Exchange(msg, resp.Answers.Server)
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// If UDP truncates, use TCP instead
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if !c.Bool("no-truncate") {
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@ -221,7 +206,7 @@ func main() {
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if c.Bool("6") {
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d.Net = "tcp6"
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}
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in, rtt, err = d.Exchange(msg, req.server)
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in, resp.Answers.RTT, err = d.Exchange(msg, resp.Answers.Server)
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}
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}
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}
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@ -231,14 +216,14 @@ func main() {
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}
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if c.Bool("json") {
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json, _ := json.Marshal(in)
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json, _ := json.MarshalIndent(in, "", " ")
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fmt.Println(string(json))
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} else {
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if !c.Bool("short") {
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// Print everything
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fmt.Println(in)
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fmt.Println(";; Query time:", rtt)
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fmt.Println(";; SERVER:", req.server)
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fmt.Println(";; Query time:", resp.Answers.RTT)
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fmt.Println(";; SERVER:", resp.Answers.Server)
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fmt.Println(";; WHEN:", time.Now().Format(time.RFC1123))
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fmt.Println(";; MSG SIZE rcvd:", in.Len())
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} else {
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@ -261,114 +246,51 @@ func main() {
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}
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}
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func parseArgs(args []string) request {
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func parseArgs(args []string) util.Answers {
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var (
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server string
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req uint16
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name string
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resp util.Response
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)
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for _, arg := range args {
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// If it starts with @, it's a DNS server
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if strings.HasPrefix(arg, "@") {
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server = strings.Split(arg, "@")[1]
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resp.Answers.Server = strings.Split(arg, "@")[1]
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continue
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}
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// If there's a dot, it's a name
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if strings.Contains(arg, ".") {
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name, _ = idna.ToUnicode(arg)
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resp.Answers.Name, _ = idna.ToUnicode(arg)
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continue
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}
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// If it's a request, it's a request (duh)
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if r, ok := dns.StringToType[strings.ToUpper(arg)]; ok {
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req = r
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resp.Answers.Request = r
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continue
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}
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//else, assume it's a name
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name, _ = idna.ToUnicode(arg)
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resp.Answers.Name, _ = idna.ToUnicode(arg)
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}
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// If nothing was set, set a default
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if name == "" {
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name = "."
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if req == 0 {
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req = dns.StringToType["NS"]
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if resp.Answers.Name == "" {
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resp.Answers.Name = "."
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if resp.Answers.Request == 0 {
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resp.Answers.Request = dns.StringToType["NS"]
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}
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} else {
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if req == 0 {
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req = dns.StringToType["A"]
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if resp.Answers.Request == 0 {
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resp.Answers.Request = dns.StringToType["A"]
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}
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}
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if server == "" {
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if resp.Answers.Server == "" {
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resolv, err := dns.ClientConfigFromFile("/etc/resolv.conf")
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if err != nil { // Query Google by default, needed for Windows since the DNS library doesn't support Windows
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// TODO: Actually find where windows stuffs its dns resolvers
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server = "8.8.4.4"
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resp.Answers.Server = "8.8.4.4"
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} else {
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server = resolv.Servers[0]
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resp.Answers.Server = resolv.Servers[0]
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}
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}
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return request{server: server, request: req, name: name}
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}
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func reverseDNS(dom string, q string) (string, error) {
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if q == "PTR" {
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if strings.Contains(dom, ".") {
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// It's an IPv4 address
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ip := net.ParseIP(dom)
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if ip != nil {
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return iplib.IP4ToARPA(ip), nil
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} else {
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return "", errors.New("error: Could not parse IPv4 address")
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}
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} else if strings.Contains(dom, ":") {
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// It's an IPv6 address
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ip := net.ParseIP(dom)
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if ip != nil {
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return iplib.IP6ToARPA(ip), nil
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} else {
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return "", errors.New("error: Could not parse IPv6 address")
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}
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}
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}
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return "", errors.New("error: -x flag given but no IP found")
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}
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func resolveHTTPS(msg *dns.Msg, server string) (*dns.Msg, error) {
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httpR := &http.Client{}
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buf, err := msg.Pack()
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if err != nil {
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return nil, err
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}
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query := server + "?dns=" + base64.RawURLEncoding.EncodeToString(buf)
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req, err := http.NewRequest("GET", query, nil)
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if err != nil {
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return nil, err
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}
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req.Header.Set("Accept", "application/dns-message")
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res, err := httpR.Do(req)
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if err != nil {
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return nil, err
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}
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defer res.Body.Close()
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if res.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("bad HTTP Request: %d", res.StatusCode)
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}
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fullRes, err := io.ReadAll(res.Body)
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if err != nil {
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return nil, err
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}
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response := dns.Msg{}
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err = response.Unpack(fullRes)
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if err != nil {
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return nil, err
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}
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return &response, nil
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return util.Answers{Server: resp.Answers.Server, Request: resp.Answers.Request, Name: resp.Answers.Name}
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}
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9
go.mod
9
go.mod
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@ -1,4 +1,4 @@
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module example.com/awl
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module git.froth.zone/sam/awl
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go 1.18
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@ -13,8 +13,9 @@ require (
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github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
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github.com/russross/blackfriday/v2 v2.1.0 // indirect
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github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 // indirect
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golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4 // indirect
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golang.org/x/sys v0.0.0-20220615213510-4f61da869c0c // indirect
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golang.org/x/mod v0.4.2 // indirect
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golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a // indirect
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golang.org/x/text v0.3.7 // indirect
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golang.org/x/tools v0.1.11 // indirect
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golang.org/x/tools v0.1.6-0.20210726203631-07bc1bf47fb2 // indirect
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golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
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)
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15
go.sum
15
go.sum
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@ -2,8 +2,6 @@ github.com/c-robinson/iplib v1.0.3 h1:NG0UF0GoEsrC1/vyfX1Lx2Ss7CySWl3KqqXh3q4DdP
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github.com/c-robinson/iplib v1.0.3/go.mod h1:i3LuuFL1hRT5gFpBRnEydzw8R6yhGkF4szNDIbF8pgo=
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github.com/cpuguy83/go-md2man/v2 v2.0.2 h1:p1EgwI/C7NhT0JmVkwCD2ZBK8j4aeHQX2pMHHBfMQ6w=
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github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
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github.com/miekg/dns v1.1.49 h1:qe0mQU3Z/XpFeE+AEBo2rqaS1IPBJ3anmqZ4XiZJVG8=
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github.com/miekg/dns v1.1.49/go.mod h1:e3IlAVfNqAllflbibAZEWOXOQ+Ynzk/dDozDxY7XnME=
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github.com/miekg/dns v1.1.50 h1:DQUfb9uc6smULcREF09Uc+/Gd46YWqJd5DbpPE9xkcA=
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github.com/miekg/dns v1.1.50/go.mod h1:e3IlAVfNqAllflbibAZEWOXOQ+Ynzk/dDozDxY7XnME=
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github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=
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@ -15,15 +13,12 @@ github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673/go.mod h1:N3UwUGtsr
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github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
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golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
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golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
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golang.org/x/mod v0.4.2 h1:Gz96sIWK3OalVv/I/qNygP42zyoKp3xptRVCWRFEBvo=
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golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
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golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4 h1:6zppjxzCulZykYSLyVDYbneBfbaBIQPYMevg0bEwv2s=
|
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golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
|
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golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
|
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golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
|
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golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
|
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golang.org/x/net v0.0.0-20210726213435-c6fcb2dbf985/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
|
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golang.org/x/net v0.0.0-20220617184016-355a448f1bc9 h1:Yqz/iviulwKwAREEeUd3nbBFn0XuyJqkoft2IlrvOhc=
|
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golang.org/x/net v0.0.0-20220617184016-355a448f1bc9/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
|
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golang.org/x/net v0.0.0-20220621193019-9d032be2e588 h1:9ubFuySsnAJYGyJrZ3koiEv8FyqofCBdz3G9Mbf2YFc=
|
||||
golang.org/x/net v0.0.0-20220621193019-9d032be2e588/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
|
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golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
|
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|
|
@ -36,8 +31,8 @@ golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7w
|
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golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
|
||||
golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
|
||||
golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
|
||||
golang.org/x/sys v0.0.0-20220615213510-4f61da869c0c h1:aFV+BgZ4svzjfabn8ERpuB4JI4N6/rdy1iusx77G3oU=
|
||||
golang.org/x/sys v0.0.0-20220615213510-4f61da869c0c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
|
||||
golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a h1:dGzPydgVsqGcTRVwiLJ1jVbufYwmzD3LfVPLKsKg+0k=
|
||||
golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
|
||||
golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
|
||||
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
|
||||
golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
|
||||
|
|
@ -46,9 +41,9 @@ golang.org/x/text v0.3.7 h1:olpwvP2KacW1ZWvsR7uQhoyTYvKAupfQrRGBFM352Gk=
|
|||
golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
|
||||
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
|
||||
golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
|
||||
golang.org/x/tools v0.1.6-0.20210726203631-07bc1bf47fb2 h1:BonxutuHCTL0rBDnZlKjpGIQFTjyUVTexFOdWkB6Fg0=
|
||||
golang.org/x/tools v0.1.6-0.20210726203631-07bc1bf47fb2/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
|
||||
golang.org/x/tools v0.1.11 h1:loJ25fNOEhSXfHrpoGj91eCUThwdNX6u24rO1xnNteY=
|
||||
golang.org/x/tools v0.1.11/go.mod h1:SgwaegtQh8clINPpECJMqnxLv9I09HLqnW3RMqW0CA4=
|
||||
golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
|
||||
golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
|
||||
golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
|
||||
golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
|
||||
|
|
|
|||
|
|
@ -0,0 +1,89 @@
|
|||
package util
|
||||
|
||||
import (
|
||||
"encoding/base64"
|
||||
"errors"
|
||||
"fmt"
|
||||
"io"
|
||||
"net"
|
||||
"net/http"
|
||||
"strings"
|
||||
"time"
|
||||
|
||||
"github.com/c-robinson/iplib"
|
||||
"github.com/miekg/dns"
|
||||
)
|
||||
|
||||
type Response struct {
|
||||
Answers Answers `json:"Response"` //
|
||||
}
|
||||
|
||||
// The Answers struct is the basic structure of a DNS request
|
||||
// to be returned to the user upon making a request
|
||||
type Answers struct {
|
||||
Server string `json:"Server"` // The server to make the DNS request from
|
||||
Request uint16 `json:"Request"` // The type of request
|
||||
Name string `json:"Name"` // The domain name to make a DNS request for
|
||||
RTT time.Duration `json:"RTT"` // When AWL was ran
|
||||
}
|
||||
|
||||
func ReverseDNS(dom string, q string) (string, error) {
|
||||
if q == "PTR" {
|
||||
if strings.Contains(dom, ".") {
|
||||
// It's an IPv4 address
|
||||
ip := net.ParseIP(dom)
|
||||
if ip != nil {
|
||||
return iplib.IP4ToARPA(ip), nil
|
||||
} else {
|
||||
return "", errors.New("error: Could not parse IPv4 address")
|
||||
}
|
||||
|
||||
} else if strings.Contains(dom, ":") {
|
||||
// It's an IPv6 address
|
||||
ip := net.ParseIP(dom)
|
||||
if ip != nil {
|
||||
return iplib.IP6ToARPA(ip), nil
|
||||
} else {
|
||||
return "", errors.New("error: Could not parse IPv6 address")
|
||||
}
|
||||
}
|
||||
}
|
||||
return "", errors.New("error: -x flag given but no IP found")
|
||||
}
|
||||
|
||||
func ResolveHTTPS(msg *dns.Msg, server string) (*dns.Msg, error) {
|
||||
httpR := &http.Client{}
|
||||
buf, err := msg.Pack()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
query := server + "?dns=" + base64.RawURLEncoding.EncodeToString(buf)
|
||||
req, err := http.NewRequest("GET", query, nil)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
req.Header.Set("Accept", "application/dns-message")
|
||||
|
||||
res, err := httpR.Do(req)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
defer res.Body.Close()
|
||||
|
||||
if res.StatusCode != http.StatusOK {
|
||||
return nil, fmt.Errorf("bad HTTP Request: %d", res.StatusCode)
|
||||
}
|
||||
|
||||
fullRes, err := io.ReadAll(res.Body)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
response := dns.Msg{}
|
||||
err = response.Unpack(fullRes)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return &response, nil
|
||||
|
||||
}
|
||||
Loading…
Reference in New Issue