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monitor.go
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package main
import (
"encoding/json"
"html/template"
"io/ioutil"
"log"
"net"
"net/http"
"os"
"strings"
"sync"
"time"
)
var PrettyResultName = map[int]string{
ResultSecure: "Secure",
ResultUnknown: "Unknown",
ResultConnectionRefused: "Connection Refused",
ResultVunerable: "Vunerable",
ResultError: "Unknown - errored",
}
var ResultTableRow = map[int]string{
ResultSecure: "success",
ResultUnknown: "active",
ResultConnectionRefused: "info",
ResultVunerable: "danger",
ResultError: "active",
}
var HostMutex sync.RWMutex
type Target struct {
Host string
OriginalHost string
LastChecked *time.Time
TimeVerified *time.Time
LastError error
State int
}
func checkMultiHosts(hostFile string, timeout, retryDelay, refreshDelay time.Duration, numWorkers int, listenAddr string) {
hosts := readHosts(hostFile)
dispatch := make(chan *Target, len(hosts)*2)
for x := 0; x < numWorkers; x++ {
go scanner(dispatch, timeout, retryDelay)
}
log.Print("Serving Heartbleed dashboard at http://", listenAddr)
go feed(hosts, dispatch, retryDelay, false)
go feed(hosts, dispatch, refreshDelay, true)
handleHTTP(hosts, listenAddr)
}
func feed(hosts []*Target, work chan *Target, delay time.Duration, secure bool) {
for {
i := 0
HostMutex.RLock()
for _, host := range hosts {
if secure && host.State != ResultSecure {
continue
} else if !secure && host.State == ResultSecure {
continue
}
work <- host
i++
}
HostMutex.RUnlock()
if i > 0 {
if secure {
log.Printf("Submitted %d hosts for rescanning", i)
} else {
log.Printf("Submitted %d unfinished hosts for scanning", i)
}
}
time.Sleep(delay)
}
}
func scanner(source chan *Target, timeout, retryDelay time.Duration) {
for target := range source {
state, err := checkHeartbeat(target.Host, timeout, nil)
now := time.Now()
HostMutex.Lock()
target.LastChecked = &now
target.State = state
target.LastError = err
if target.State == ResultSecure {
target.TimeVerified = target.LastChecked
}
HostMutex.Unlock()
}
}
func NewTarget(hostaddr string) []*Target {
host, port, err := net.SplitHostPort(hostaddr)
if err != nil {
host = hostaddr
port = "443"
}
hostport := net.JoinHostPort(host, port)
if net.ParseIP(host) != nil {
return []*Target{&Target{Host: hostport, OriginalHost: hostport, State: ResultUnknown}}
}
addrs, err := net.LookupIP(host)
if err != nil {
log.Printf("Failed DNS lookup on %s. Not adding to scanner - %s", host, err)
return nil
}
// Add a target for each IP so we can get an accurate view
targets := make([]*Target, len(addrs))
for i, addr := range addrs {
targets[i] = &Target{Host: net.JoinHostPort(addr.String(), port), OriginalHost: hostport, State: ResultUnknown}
}
return targets
}
func readHosts(hostFile string) []*Target {
var targets []*Target
contents, err := ioutil.ReadFile(hostFile)
if err != nil {
log.Fatal(err)
os.Exit(1)
}
for _, line := range strings.Split(string(contents), "\n") {
line := strings.TrimSpace(line)
if line == "" {
continue
}
targets = append(targets, NewTarget(line)...)
}
return targets
}
func handleHTTP(hosts []*Target, listenAddr string) {
tmpl, _ := template.New("foo").Parse(`
{{define "header"}}
<html>
<head>
<title>Heartbleeder Dashboard</title>
<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css"/>
</head>
<body>
{{end}}
{{define "summary"}}
<p>Total {{.Header}} hosts: <strong>{{.Count}}</strong></p>
{{end}}
{{define "targetrowbegin"}}
<table class="table table-hover table-bordered">
<tr><th>Target</th><th>IP</th><th>Checked</th>
{{end}}
{{define "targetrow"}}
<tr class="{{.Style}}">
<td>{{.Target.OriginalHost}}</td><td>{{.Target.Host}}</td><td>{{.Target.LastChecked}}</td></tr>
{{end}}
{{define "targetrowend"}}
</table>
{{end}}
{{define "footer"}}
</body>
</html>
{{end}}`)
type TargetRowContext struct {
Target
Style string
}
type SummaryContext struct {
Header string
Count int
}
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
totals := make(map[int]int)
for _, host := range hosts {
totals[host.State] += 1
}
if r.Method != "GET" {
http.Error(w, "Only GET is supported", http.StatusMethodNotAllowed)
return
}
tmpl.ExecuteTemplate(w, "header", nil)
for state, total := range totals {
tmpl.ExecuteTemplate(w, "summary", SummaryContext{Header: PrettyResultName[state], Count: total})
tmpl.ExecuteTemplate(w, "targetrowbegin", nil)
HostMutex.RLock()
for _, target := range hosts {
if target.State != state {
continue
}
t := TargetRowContext{
Target: *target,
Style: ResultTableRow[target.State],
}
tmpl.ExecuteTemplate(w, "targetrow", t)
}
HostMutex.RUnlock()
tmpl.ExecuteTemplate(w, "targetrowend", nil)
}
tmpl.ExecuteTemplate(w, "footer", nil)
})
http.HandleFunc("/api/hosts", func(w http.ResponseWriter, r *http.Request) {
if r.Method != "GET" {
http.Error(w, "Only GET is supported", http.StatusMethodNotAllowed)
return
}
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Access-Control-Allow-Origin", "*")
j, err := json.Marshal(hosts)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Write(j)
})
log.Fatal(http.ListenAndServe(listenAddr, nil))
}