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|
package main
import (
"flag"
"fmt"
"io"
"log"
"net"
"os"
"strconv"
"strings"
"time"
"gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/v2/common/event"
"gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/v2/common/safelog"
"gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/v2/common/version"
sf "gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/v2/proxy/lib"
)
func main() {
capacity := flag.Uint("capacity", 0, "maximum concurrent clients (default is to accept an unlimited number of clients)")
stunURL := flag.String("stun", sf.DefaultSTUNURL, "STUN URL")
logFilename := flag.String("log", "", "log filename")
rawBrokerURL := flag.String("broker", sf.DefaultBrokerURL, "broker URL")
unsafeLogging := flag.Bool("unsafe-logging", false, "prevent logs from being scrubbed")
keepLocalAddresses := flag.Bool("keep-local-addresses", false, "keep local LAN address ICE candidates")
relayURL := flag.String("relay", sf.DefaultRelayURL, "websocket relay URL")
probeURL := flag.String("nat-probe-server", sf.DefaultNATProbeURL, "NAT check probe server URL")
outboundAddress := flag.String("outbound-address", "", "prefer the given address as outbound address")
allowedRelayHostNamePattern := flag.String("allowed-relay-hostname-pattern", "snowflake.torproject.net$", "a pattern to specify allowed hostname pattern for relay URL.")
allowNonTLSRelay := flag.Bool("allow-non-tls-relay", false, "allow relay without tls encryption")
NATTypeMeasurementInterval := flag.Duration("nat-retest-interval", time.Hour*24,
"the time interval in second before NAT type is retested, 0s disables retest. Valid time units are \"s\", \"m\", \"h\". ")
summaryInterval := flag.Duration("summary-interval", time.Hour,
"the time interval to output summary, 0s disables summaries. Valid time units are \"s\", \"m\", \"h\". ")
disableStatsLogger := flag.Bool("disable-stats-logger", false, "disable the exposing mechanism for stats using logs")
enableMetrics := flag.Bool("metrics", false, "enable the exposing mechanism for stats using metrics")
metricsPort := flag.Int("metrics-port", 9999, "set port for the metrics service")
verboseLogging := flag.Bool("verbose", false, "increase log verbosity")
ephemeralPortsRangeFlag := flag.String("ephemeral-ports-range", "", "ICE UDP ephemeral ports range (format:\"<min>:<max>\")")
versionFlag := flag.Bool("version", false, "display version info to stderr and quit")
var ephemeralPortsRange []uint16 = []uint16{0, 0}
flag.Parse()
if *versionFlag {
fmt.Fprintf(os.Stderr, "snowflake-proxy %s", version.ConstructResult())
os.Exit(0)
}
if *outboundAddress != "" && *keepLocalAddresses {
log.Fatal("Cannot keep local address candidates when outbound address is specified")
}
eventLogger := event.NewSnowflakeEventDispatcher()
if *ephemeralPortsRangeFlag != "" {
ephemeralPortsRangeParts := strings.Split(*ephemeralPortsRangeFlag, ":")
if len(ephemeralPortsRangeParts) == 2 {
ephemeralMinPort, err := strconv.ParseUint(ephemeralPortsRangeParts[0], 10, 16)
if err != nil {
log.Fatal(err)
}
ephemeralMaxPort, err := strconv.ParseUint(ephemeralPortsRangeParts[1], 10, 16)
if err != nil {
log.Fatal(err)
}
if ephemeralMinPort == 0 || ephemeralMaxPort == 0 {
log.Fatal("Ephemeral port cannot be zero")
}
if ephemeralMinPort > ephemeralMaxPort {
log.Fatal("Invalid port range: min > max")
}
ephemeralPortsRange = []uint16{uint16(ephemeralMinPort), uint16(ephemeralMaxPort)}
} else {
log.Fatalf("Bad range port format: %v", *ephemeralPortsRangeFlag)
}
}
proxy := sf.SnowflakeProxy{
Capacity: uint(*capacity),
STUNURL: *stunURL,
BrokerURL: *rawBrokerURL,
KeepLocalAddresses: *keepLocalAddresses,
RelayURL: *relayURL,
NATProbeURL: *probeURL,
OutboundAddress: *outboundAddress,
EphemeralMinPort: ephemeralPortsRange[0],
EphemeralMaxPort: ephemeralPortsRange[1],
NATTypeMeasurementInterval: *NATTypeMeasurementInterval,
EventDispatcher: eventLogger,
RelayDomainNamePattern: *allowedRelayHostNamePattern,
AllowNonTLSRelay: *allowNonTLSRelay,
SummaryInterval: *summaryInterval,
}
var logOutput = io.Discard
var eventlogOutput io.Writer = os.Stderr
log.SetFlags(log.LstdFlags | log.LUTC)
if *verboseLogging {
logOutput = os.Stderr
}
if *logFilename != "" {
f, err := os.OpenFile(*logFilename, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0600)
if err != nil {
log.Fatal(err)
}
defer f.Close()
if *verboseLogging {
logOutput = io.MultiWriter(logOutput, f)
}
eventlogOutput = io.MultiWriter(eventlogOutput, f)
}
if *unsafeLogging {
log.SetOutput(logOutput)
} else {
log.SetOutput(&safelog.LogScrubber{Output: logOutput})
}
proxyEventLogger := sf.NewProxyEventLogger(eventlogOutput, *disableStatsLogger)
eventLogger.AddSnowflakeEventListener(proxyEventLogger)
if *enableMetrics {
metrics := sf.NewMetrics()
err := metrics.Start(net.JoinHostPort("localhost", strconv.Itoa(*metricsPort)))
if err != nil {
log.Fatalf("could not enable metrics: %v", err)
}
eventLogger.AddSnowflakeEventListener(sf.NewEventMetrics(metrics))
}
log.Printf("snowflake-proxy %s\n", version.GetVersion())
err := proxy.Start()
if err != nil {
log.Fatal(err)
}
}
|
