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|
package bonafide
import (
"encoding/json"
"fmt"
"io"
"log"
"math/rand"
"sort"
"strconv"
"strings"
"time"
"0xacab.org/leap/bitmask-vpn/pkg/config"
)
const (
eip1API = config.APIURL + "1/config/eip-service.json"
eip3API = config.APIURL + "3/config/eip-service.json"
)
type eipService struct {
Gateways []gatewayV3
Locations map[string]location
OpenvpnConfiguration openvpnConfig `json:"openvpn_configuration"`
defaultGateway string
}
type eipServiceV1 struct {
Gateways []gatewayV1
Locations map[string]location
OpenvpnConfiguration openvpnConfig `json:"openvpn_configuration"`
}
type location struct {
CountryCode string
Hemisphere string
Name string
Timezone string
}
type gatewayV1 struct {
Capabilities struct {
Ports []string
Protocols []string
}
Host string
IPAddress string `json:"ip_address"`
Location string
}
type gatewayV3 struct {
Capabilities struct {
Transport []transportV3
}
Host string
IPAddress string `json:"ip_address"`
Location string
}
type transportV3 struct {
Type string
Protocols []string
Ports []string
Options map[string]string
}
func (b *Bonafide) fetchEipJSON() error {
resp, err := b.client.Post(eip3API, "", nil)
for err != nil {
log.Printf("Error fetching eip v3 json: %v", err)
time.Sleep(retryFetchJSONSeconds * time.Second)
resp, err = b.client.Post(eip3API, "", nil)
}
defer resp.Body.Close()
switch resp.StatusCode {
case 200:
b.eip, err = decodeEIP3(resp.Body)
case 404:
buf := make([]byte, 128)
resp.Body.Read(buf)
log.Printf("Error fetching eip v3 json: %s", buf)
resp, err = b.client.Post(eip1API, "", nil)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return fmt.Errorf("get eip json has failed with status: %s", resp.Status)
}
b.eip, err = decodeEIP1(resp.Body)
default:
return fmt.Errorf("get eip json has failed with status: %s", resp.Status)
}
if err != nil {
return err
}
b.sortGateways()
return nil
}
func decodeEIP3(body io.Reader) (*eipService, error) {
var eip eipService
decoder := json.NewDecoder(body)
err := decoder.Decode(&eip)
return &eip, err
}
func decodeEIP1(body io.Reader) (*eipService, error) {
var eip1 eipServiceV1
decoder := json.NewDecoder(body)
err := decoder.Decode(&eip1)
if err != nil {
log.Printf("Error fetching eip v1 json: %v", err)
return nil, err
}
eip3 := eipService{
Gateways: make([]gatewayV3, len(eip1.Gateways)),
Locations: eip1.Locations,
OpenvpnConfiguration: eip1.OpenvpnConfiguration,
}
for _, g := range eip1.Gateways {
gateway := gatewayV3{
Host: g.Host,
IPAddress: g.IPAddress,
Location: g.Location,
}
gateway.Capabilities.Transport = []transportV3{
transportV3{
Type: "openvpn",
Ports: g.Capabilities.Ports,
Protocols: g.Capabilities.Protocols,
},
}
eip3.Gateways = append(eip3.Gateways, gateway)
}
return &eip3, nil
}
func (eip eipService) getGateways(transport string) []Gateway {
gws := []Gateway{}
for _, g := range eip.Gateways {
for _, t := range g.Capabilities.Transport {
if t.Type != transport {
continue
}
gateway := Gateway{
Host: g.Host,
IPAddress: g.IPAddress,
Location: g.Location,
Ports: t.Ports,
Protocols: t.Protocols,
Options: t.Options,
}
gws = append(gws, gateway)
}
}
return gws
}
func (eip *eipService) setDefaultGateway(name string) {
eip.defaultGateway = name
}
func (eip eipService) getOpenvpnArgs() []string {
args := []string{}
for arg, value := range eip.OpenvpnConfiguration {
switch v := value.(type) {
case string:
args = append(args, "--"+arg)
args = append(args, strings.Split(v, " ")...)
case bool:
if v {
args = append(args, "--"+arg)
}
default:
log.Printf("Unknown openvpn argument type: %s - %v", arg, value)
}
}
return args
}
func (eip *eipService) sortGatewaysByGeolocation(geolocatedGateways []string) {
gws := make([]gatewayV3, len(eip.Gateways))
if eip.defaultGateway != "" {
for _, gw := range eip.Gateways {
if gw.Location == eip.defaultGateway {
gws = append(gws, gw)
break
}
}
}
for _, host := range geolocatedGateways {
for _, gw := range eip.Gateways {
if gw.Host == host {
gws = append(gws, gw)
}
}
}
eip.Gateways = gws
}
type gatewayDistance struct {
gateway gatewayV3
distance int
}
func (eip *eipService) sortGatewaysByTimezone(tzOffsetHours int) {
gws := []gatewayDistance{}
for _, gw := range eip.Gateways {
distance := 13
if gw.Location == eip.defaultGateway {
distance = -1
} else {
gwOffset, err := strconv.Atoi(eip.Locations[gw.Location].Timezone)
if err != nil {
log.Printf("Error sorting gateways: %v", err)
} else {
distance = tzDistance(tzOffsetHours, gwOffset)
}
}
gws = append(gws, gatewayDistance{gw, distance})
}
rand.Seed(time.Now().UnixNano())
cmp := func(i, j int) bool {
if gws[i].distance == gws[j].distance {
return rand.Intn(2) == 1
}
return gws[i].distance < gws[j].distance
}
sort.Slice(gws, cmp)
for i, gw := range gws {
eip.Gateways[i] = gw.gateway
}
}
func tzDistance(offset1, offset2 int) int {
abs := func(x int) int {
if x < 0 {
return -x
}
return x
}
distance := abs(offset1 - offset2)
if distance > 12 {
distance = 24 - distance
}
return distance
}
|
