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// Copyright (c) 2018 LEAP Encryption Access Project
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package main
import (
"encoding/json"
"flag"
"fmt"
"log"
"net"
"net/http"
"regexp"
"strconv"
"strings"
"github.com/StefanSchroeder/Golang-Ellipsoid/ellipsoid"
"github.com/hongshibao/go-kdtree"
"github.com/oschwald/geoip2-golang"
"github.com/tidwall/cities"
)
func floatToString(num float64) string {
return strconv.FormatFloat(num, 'f', 6, 64)
}
func getRemoteIP(req *http.Request) string {
forward := req.Header.Get("X-Forwarded-For")
ipstr := ""
if forward != "" {
ipstr = forward
} else {
ip, _, err := net.SplitHostPort(req.RemoteAddr)
if err != nil {
log.Fatal(err)
}
netIP := net.ParseIP(ip)
ipstr = netIP.String()
}
return ipstr
}
type geodb struct {
db *geoip2.Reader
Gateways []gateway
GatewayTree *kdtree.KDTree
GatewayMap map[[3]float64]gateway
earth *ellipsoid.Ellipsoid
}
func (g *geodb) getPointForLocation(lat float64, lon float64) *EuclideanPoint {
x, y, z := g.earth.ToECEF(lat, lon, 0)
p := NewEuclideanPoint(x, y, z)
return p
}
func (g *geodb) getClosestGateway(lat float64, lon float64) gateway {
t := g.getPointForLocation(lat, lon)
nn := g.GatewayTree.KNN(t, 1)[0]
p := [3]float64{nn.GetValue(0), nn.GetValue(1), nn.GetValue(2)}
closestGateway := g.GatewayMap[p]
return closestGateway
}
func (g *geodb) geolocateGateways(b *bonafide) {
g.GatewayMap = make(map[[3]float64]gateway)
gatewayPoints := make([]kdtree.Point, 0)
for i := 0; i < len(b.eip.Gateways); i++ {
gw := b.eip.Gateways[i]
coord := geolocateCity(gw.Location)
gw.Coordinates = coord
b.eip.Gateways[i] = gw
p := g.getPointForLocation(coord.Latitude, coord.Longitude)
gatewayPoints = append(gatewayPoints, *p)
var i [3]float64
copy(i[:], p.Vec)
g.GatewayMap[i] = gw
}
g.Gateways = b.eip.Gateways
g.GatewayTree = kdtree.NewKDTree(gatewayPoints)
}
func (g *geodb) getRecordForIP(ipstr string) *geoip2.City {
ip := net.ParseIP(ipstr)
record, err := g.db.City(ip)
if err != nil {
log.Fatal(err)
}
return record
}
func geolocateCity(city string) coordinates {
// because some cities apparently are not good enough for the top 10k
missingCities := make(map[string]coordinates)
missingCities["hongkong"] = coordinates{22.319201099, 114.1696121}
re := regexp.MustCompile("-| ")
for i := 0; i < len(cities.Cities); i++ {
c := cities.Cities[i]
canonical := strings.ToLower(city)
canonical = re.ReplaceAllString(canonical, "")
if strings.ToLower(c.City) == canonical {
return coordinates{c.Latitude, c.Longitude}
}
v, ok := missingCities[canonical]
if ok == true {
return v
}
}
return coordinates{0, 0}
}
type jsonHandler struct {
geoipdb *geodb
}
func (jh *jsonHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
ipstr := getRemoteIP(req)
record := jh.geoipdb.getRecordForIP(ipstr)
closestGateway := jh.geoipdb.getClosestGateway(record.Location.Latitude, record.Location.Longitude)
data := map[string]string{
"ip": ipstr,
"cc": record.Country.IsoCode,
"city": record.City.Names["en"],
"lat": floatToString(record.Location.Latitude),
"lon": floatToString(record.Location.Longitude),
"gw": closestGateway.Location,
"gwip": closestGateway.IPAddress,
}
dataJSON, _ := json.Marshal(data)
fmt.Fprintf(w, string(dataJSON))
}
type txtHandler struct {
geoipdb *geodb
}
func (th *txtHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
ipstr := getRemoteIP(req)
record := th.geoipdb.getRecordForIP(ipstr)
fmt.Fprintf(w, "Your IP: %s\n", ipstr)
fmt.Fprintf(w, "Your Country: %s\n", record.Country.IsoCode)
fmt.Fprintf(w, "Your City: %s\n", record.City.Names["en"])
fmt.Fprintf(w, "Your Coordinates: %s, %s\n",
floatToString(record.Location.Latitude),
floatToString(record.Location.Longitude))
}
func main() {
var port = flag.Int("port", 9001, "port where the service listens on")
var dbpath = flag.String("geodb", "/var/lib/GeoIP/GeoLite2-City.mmdb", "path to the GeoLite2-City database")
flag.Parse()
db, err := geoip2.Open(*dbpath)
if err != nil {
log.Fatal(err)
}
defer db.Close()
earth := ellipsoid.Init("WGS84", ellipsoid.Degrees, ellipsoid.Meter, ellipsoid.LongitudeIsSymmetric, ellipsoid.BearingIsSymmetric)
geoipdb := geodb{db, nil, nil, nil, &earth}
log.Println("Seeding gateway list...")
bonafide := newBonafide()
bonafide.getGateways()
geoipdb.geolocateGateways(bonafide)
bonafide.listGateways()
mux := http.NewServeMux()
jh := &jsonHandler{&geoipdb}
mux.Handle("/json", jh)
th := &txtHandler{&geoipdb}
mux.Handle("/", th)
log.Println("Started Geolocation Service")
log.Printf("Listening on port %v...\n", *port)
http.ListenAndServe(":"+strconv.Itoa(*port), mux)
}
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