/
main.go
182 lines (157 loc) · 3.67 KB
/
main.go
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package main
import (
"bufio"
"encoding/csv"
"errors"
"fmt"
"io"
"io/ioutil"
"net"
"os"
"regexp"
"sort"
log "github.com/sirupsen/logrus"
"github.com/urfave/cli"
)
// ip2asn constants
const (
RemoteHost = "whois.cymru.com" // RemoteHost TeamCymru's remote WHOIS service FQDN
RemotePort = 43 // RemotePort TeamCymru's remote WHOIS service port
)
// CLIOptions command line options
type CLIOptions struct {
Input string
Output string
}
func main() {
app := initApp()
app.Action = func(c *cli.Context) error {
// Validate arguments
opts, err := validateArgs(c)
if err != nil {
log.WithFields(log.Fields{
"message": err,
}).Fatal("invalid arguments")
}
// Parse input, send, and receieve results
header, results, err := sendAndReceive(opts.Input)
if err != nil {
log.WithFields(log.Fields{
"message": err,
}).Fatal("error during send and receive")
}
// Check for empty results (not probable)
if len(results) < 1 {
log.Info("No results!")
return nil
}
// Sort and output results
sort.Sort(ByASNumber(results))
// Write to CSV if neecessary
if opts.Output != "" {
f, err := os.Create(opts.Output)
if err != nil {
log.Fatal(err)
}
defer f.Close()
w := csv.NewWriter(f)
header := []string{"AS", "IP", "BGP Prefix", "CC", "Registry", "Allocated", "AS Name"}
err = w.Write(header)
if err != nil {
log.Fatal(err)
}
for _, res := range results {
w.Write(res.CSVRecord())
}
w.Flush()
log.WithFields(log.Fields{
"path": opts.Output,
}).Info("results saved to csv")
} else {
fmt.Printf(header)
for _, res := range results {
fmt.Printf("%s\n", res.String())
}
}
return nil
}
app.Run(os.Args)
}
func initApp() *cli.App {
app := &cli.App{
Name: "ip2asn",
Usage: "ip2asn <input_file>",
Flags: []cli.Flag{
&cli.StringFlag{
Name: "output, o",
Usage: "CSV output file",
Value: "",
},
},
}
return app
}
func validateArgs(c *cli.Context) (opts *CLIOptions, err error) {
opts = new(CLIOptions)
if c.Args().Len() != 1 {
opts.Input = ""
} else {
opts.Input = c.Args().Get(0)
}
opts.Output = c.String("output")
return opts, err
}
func sendAndReceive(input string) (header string, results []*ASNResult, err error) {
var f *os.File
results = []*ASNResult{}
header = "AS | IP | BGP Prefix | CC | Registry | Allocated | AS Name\n"
conn, err := net.Dial("tcp", fmt.Sprintf("%s:%d", RemoteHost, RemotePort))
if err != nil {
return header, results, fmt.Errorf("Error connecting to %s:%d %v", RemoteHost, RemotePort, err)
}
defer conn.Close()
// Begin and Verbose
connOpts := []byte("begin\nverbose\n")
_, err = conn.Write(connOpts)
if err != nil {
return header, results, errors.New("Unable to write to socket")
}
if input == "" {
f = os.Stdin
_, err = io.Copy(conn, f)
if err != nil {
return header, results, errors.New("Unable to write to socket")
}
} else {
contents, err := ioutil.ReadFile(input)
if err != nil {
return header, results, fmt.Errorf("Error opening input file %v", err)
}
_, err = conn.Write(contents)
}
_, err = conn.Write([]byte("end\n"))
if err != nil {
return header, results, errors.New("Unable to write to socket")
}
rBulkMode := regexp.MustCompile("(Bulk mode;)")
connbuf := bufio.NewReader(conn)
for {
str, err := connbuf.ReadString('\n')
if len(str) > 0 {
if !rBulkMode.MatchString(str) {
res, err := parseASNResultFromString(str)
if err != nil {
return header, results, err
}
if res != nil {
results = append(results, res)
}
}
}
if err != nil {
err = nil
break
}
}
return header, results, err
}