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|
package nymclient
import (
"context"
"fmt"
"io"
"net"
"os"
"os/exec"
"path/filepath"
"strings"
"sync"
"time"
)
type Config struct {
Binary string
Provider string
HomeDir string
ClientID string
SocksAddr string
AnonymousReplies bool
StartupTimeout time.Duration
LogOutput io.Writer
}
type Manager struct {
cfg Config
cmd *exec.Cmd
mu sync.Mutex
}
func New(cfg Config) (*Manager, error) {
if cfg.Binary == "" {
cfg.Binary = "nym-socks5-client"
}
if cfg.HomeDir == "" {
return nil, fmt.Errorf("nym home dir is required")
}
if cfg.ClientID == "" {
cfg.ClientID = "n2usenet"
}
if cfg.SocksAddr == "" {
cfg.SocksAddr = "127.0.0.1:11080"
}
if cfg.Provider == "" {
return nil, fmt.Errorf("nym provider is required")
}
if cfg.StartupTimeout <= 0 {
cfg.StartupTimeout = 120 * time.Second
}
if cfg.LogOutput == nil {
cfg.LogOutput = os.Stderr
}
return &Manager{cfg: cfg}, nil
}
func (m *Manager) Init(ctx context.Context) error {
binary, err := exec.LookPath(m.cfg.Binary)
if err != nil {
if _, statErr := os.Stat(m.cfg.Binary); statErr != nil {
return fmt.Errorf("find nym-socks5-client: %w", err)
}
binary = m.cfg.Binary
}
m.cfg.Binary = binary
if err := os.MkdirAll(m.cfg.HomeDir, 0700); err != nil {
return fmt.Errorf("create nym home: %w", err)
}
configFile := filepath.Join(m.cfg.HomeDir, ".nym", "socks5-clients", m.cfg.ClientID, "config", "config.toml")
if data, err := os.ReadFile(configFile); err == nil {
if !strings.Contains(string(data), m.cfg.Provider) {
return fmt.Errorf("existing nym client config uses a different provider; remove %s to reinitialize intentionally", filepath.Dir(filepath.Dir(configFile)))
}
return nil
}
host, port, err := net.SplitHostPort(m.cfg.SocksAddr)
if err != nil {
return fmt.Errorf("split socks addr: %w", err)
}
args := []string{
"init",
"--id", m.cfg.ClientID,
"--provider", m.cfg.Provider,
"--host", host,
"--port", port,
}
if m.cfg.AnonymousReplies {
args = append(args, "--use-reply-surbs", "true")
}
cmd := exec.CommandContext(ctx, m.cfg.Binary, args...)
cmd.Env = append(os.Environ(), "HOME="+m.cfg.HomeDir)
cmd.Stdout = m.cfg.LogOutput
cmd.Stderr = m.cfg.LogOutput
if err := cmd.Run(); err != nil {
return fmt.Errorf("nym-socks5-client init: %w", err)
}
return nil
}
func (m *Manager) Start(ctx context.Context) error {
m.mu.Lock()
defer m.mu.Unlock()
if m.cmd != nil {
return nil
}
host, port, err := net.SplitHostPort(m.cfg.SocksAddr)
if err != nil {
return fmt.Errorf("split socks addr: %w", err)
}
args := []string{"run", "--id", m.cfg.ClientID, "--host", host, "--port", port}
if m.cfg.AnonymousReplies {
args = append(args, "--use-anonymous-replies", "true")
}
cmd := exec.CommandContext(ctx, m.cfg.Binary, args...)
cmd.Env = append(os.Environ(), "HOME="+m.cfg.HomeDir)
cmd.Stdout = m.cfg.LogOutput
cmd.Stderr = m.cfg.LogOutput
if err := cmd.Start(); err != nil {
return fmt.Errorf("start nym-socks5-client: %w", err)
}
m.cmd = cmd
go func() {
_ = cmd.Wait()
}()
deadline := time.Now().Add(m.cfg.StartupTimeout)
for {
dialCtx, cancel := context.WithTimeout(ctx, 500*time.Millisecond)
conn, err := (&net.Dialer{}).DialContext(dialCtx, "tcp", m.cfg.SocksAddr)
cancel()
if err == nil {
_ = conn.Close()
return nil
}
if time.Now().After(deadline) {
m.Stop()
return fmt.Errorf("nym-socks5-client did not open %s within %s", m.cfg.SocksAddr, m.cfg.StartupTimeout)
}
select {
case <-ctx.Done():
m.Stop()
return ctx.Err()
case <-time.After(500 * time.Millisecond):
}
}
}
func (m *Manager) Stop() {
m.mu.Lock()
defer m.mu.Unlock()
if m.cmd == nil || m.cmd.Process == nil {
return
}
_ = m.cmd.Process.Signal(os.Interrupt)
done := make(chan struct{})
go func() {
_ = m.cmd.Wait()
close(done)
}()
select {
case <-done:
case <-time.After(5 * time.Second):
_ = m.cmd.Process.Kill()
}
m.cmd = nil
}
|
