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main.go
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main.go
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package main
import (
"crypto/rsa"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"os/exec"
"strings"
"time"
jwt "github.com/dgrijalva/jwt-go"
)
var (
// BuildVersion - populated during go build
BuildVersion string
// BuildTime - populated during go build
BuildTime string
)
// os.Args[1] // API Address
// os.Args[2] // UID
// os.Args[3] // 256 byte RSA Private key path
type routerInfoReport struct {
}
type dataReport struct {
T uint64
Nf []Netfilter
Ct []Conntrack
Hostnames []hostname
WanIP string
Ping pingStats
Speed speedStats
Device deviceStats
MemUsage memUsageStats
AppUptime uint64
}
var signKey *rsa.PrivateKey
var startTime time.Time
var sfe bool
var lanInterface string
var wanInterface string
var wanIP string
var uptime string
func main() {
startTime = time.Now()
fmt.Printf("wrt-link %v %v \n", BuildVersion, BuildTime)
setupHTTPClient()
signBytes, err := ioutil.ReadFile(os.Args[3])
if err != nil {
log.Fatal(err)
}
signKey, err = jwt.ParseRSAPrivateKeyFromPEM(signBytes)
if err != nil {
log.Fatal(err)
}
testAuthCreds()
collectStartupInfo()
log.Println("Setting up Ip tables")
setupIptable()
conntrackResultChan := make(chan []Conntrack, 2)
requestConntrackChan := make(chan bool, 2)
speedMonitorChan := make(chan speedStats, 2)
requestSpeedMonitorChan := make(chan bool, 2)
go readConntrackScheduler(conntrackResultChan, requestConntrackChan)
go speedMonitor(speedMonitorChan, requestSpeedMonitorChan)
go pingForInterval()
go reporter()
for range time.Tick(time.Minute) {
requestConntrackChan <- true
requestSpeedMonitorChan <- true
collectReport(
conntrackResultChan,
speedMonitorChan,
)
}
}
// testAuthCreds - Test creds before starting. ~10 mins to pass test before exit
func testAuthCreds() {
for i := 0; i < 20; i++ {
req, err := http.NewRequest("GET", fullURL("authCheck"), nil)
if err != nil {
log.Println(err)
}
req.Header.Set("Content-Type", "application/json")
req.Header.Add("Authorization", "Bearer "+createToken())
resp, err := client.Do(req)
if err != nil {
log.Println(err)
time.Sleep(30 * time.Second)
continue
}
if resp.StatusCode != 200 {
s := []string{"API returned status code", resp.Status, fullURL("authCheck")}
err = errors.New(strings.Join(s, " "))
log.Println(err)
}
if resp.StatusCode == 200 {
log.Println("Auth OK! Starting Logging.")
return
}
defer resp.Body.Close()
time.Sleep(30 * time.Second)
}
log.Fatal("Failed AuthCheck")
}
func collectStartupInfo() {
out, err := exec.Command("nvram", "get", "DD_BOARD").Output()
if err != nil {
log.Fatal(err)
}
routerModel := string(strings.TrimSuffix(string(out), "\n"))
log.Printf("Router Model is %s\n", routerModel)
out, err = exec.Command("nvram", "get", "os_version").Output()
if err != nil {
log.Fatal(err)
}
osVersion := string(strings.TrimSuffix(string(out), "\n"))
log.Printf("Firmware build %s\n", osVersion)
out, err = exec.Command("nvram", "get", "sfe").Output()
if err != nil {
log.Fatal(err)
}
if out[0] == '1' {
sfe = true
}
log.Printf("SFE is %t\n", sfe)
out, err = exec.Command("nvram", "get", "lan_ifname").Output()
if err != nil {
log.Fatal(err)
}
lanInterface = string(strings.TrimSuffix(string(out), "\n"))
log.Printf("Lan Interface is %s\n", lanInterface)
out, err = exec.Command("nvram", "get", "wan_ifname").Output()
if err != nil {
log.Fatal(err)
}
wanInterface = string(strings.TrimSuffix(string(out), "\n"))
log.Printf("Wan Interface is %s\n", wanInterface)
out, err = exec.Command("uptime", "-s").Output()
if err != nil {
log.Fatal(err)
}
uptime = string(strings.TrimSuffix(string(out), "\n"))
message := map[string]interface{}{
"routerModel": routerModel,
"osVersion": osVersion,
"sfe": sfe,
"lanInterface": lanInterface,
"uptime": uptime,
}
bytes, err := json.Marshal(message)
if err != nil {
log.Println(err)
return
}
sendReport("POST", true, "startup", bytes)
}
func collectReport(
conntrackResultChan <-chan []Conntrack,
speedMonitorChan <-chan speedStats,
) {
conntrackResult := <-conntrackResultChan
speedStats := <-speedMonitorChan
// Iptables
iptableResult := readIptable(conntrackResult)
setupIptable()
tmpByteArr, err := exec.Command("nvram", "get", "wan_ipaddr").Output()
if err != nil {
log.Fatal(err)
wanIP = "Error"
} else {
wanIP = strings.TrimSuffix(string(tmpByteArr), "\n")
}
// Create message
message := dataReport{
T: uint64(time.Now().Unix()),
Nf: iptableResult,
Ct: conntrackResult,
Hostnames: getHostnames(),
WanIP: wanIP,
Ping: getPingStats(),
Speed: speedStats,
Device: getDeviceStats(),
MemUsage: getMemUsage(),
AppUptime: uint64(time.Since(startTime).Seconds()),
}
bytes, err := json.Marshal(message)
if err != nil {
log.Println(err)
return
}
sendReport("POST", true, "report", bytes)
go pingForInterval()
}