mirror of
https://github.com/shadow1ng/fscan.git
synced 2026-09-22 03:10:42 +08:00
108 lines
2.9 KiB
Go
108 lines
2.9 KiB
Go
package common
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import (
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"context"
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"fmt"
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"net"
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"strings"
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"sync"
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"time"
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"github.com/shadow1ng/fscan/common/proxy"
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"github.com/shadow1ng/fscan/common/i18n"
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)
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// ScanSession 封装单次扫描的全部上下文
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// 一次扫描一个 session，并发扫描各自独立
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type ScanSession struct {
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Config *Config // 不可变，创建后只读
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State *State // 可变，原子操作，每会话独立
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Params *FlagVars // 原始参数，只读
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// 每会话 dialer（懒初始化，取决于代理配置）
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dialerOnce sync.Once
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dialer proxy.Dialer
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dialerErr error
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}
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// NewScanSession 从已构建的 Config、State 和 FlagVars 创建会话
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func NewScanSession(config *Config, state *State, params *FlagVars) *ScanSession {
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return &ScanSession{
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Config: config,
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State: state,
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Params: params,
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}
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}
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// DialTCP 创建 TCP 连接，内含限速检查、代理、计数
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func (s *ScanSession) DialTCP(ctx context.Context, network, address string, timeout time.Duration) (net.Conn, error) {
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// 检查发包限制
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if ok, err := CanSendPacketWith(s.Config, s.State); !ok {
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LogError(fmt.Sprintf("TCP连接 %s 受限: %s", address, err.Error()))
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return nil, fmt.Errorf("%s", i18n.Tr("network_rate_limited", err.Error()))
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}
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// 获取 dialer
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dialer, err := s.getDialer()
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if err != nil {
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LogError(fmt.Sprintf("获取代理拨号器失败: %v", err))
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s.State.IncrementTCPFailedPacketCount()
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return nil, err
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}
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conn, err := dialer.DialContext(ctx, network, address)
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if err != nil {
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s.State.IncrementTCPFailedPacketCount()
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LogDebug(fmt.Sprintf("连接 %s 失败: %v", address, err))
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return nil, err
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}
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// SO_LINGER=0: 连接关闭时立即发送 RST，避免 TIME_WAIT 堆积
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if tc, ok := conn.(*net.TCPConn); ok {
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_ = tc.SetLinger(0)
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}
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s.State.IncrementTCPSuccessPacketCount()
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return conn, nil
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}
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func (s *ScanSession) getDialer() (proxy.Dialer, error) {
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s.dialerOnce.Do(func() {
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cfg := s.createProxyConfig()
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manager := proxy.NewProxyManager(cfg)
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s.dialer, s.dialerErr = manager.GetDialer()
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})
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return s.dialer, s.dialerErr
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}
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func (s *ScanSession) createProxyConfig() *proxy.ProxyConfig {
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cfg := proxy.DefaultProxyConfig()
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cfg.Timeout = s.Config.Timeout
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cfg.LocalAddr = s.Config.Network.Iface
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// 优先 SOCKS5
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if s.Config.Network.Socks5Proxy != "" {
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cfg.Type = proxy.ProxyTypeSOCKS5
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socks5URL := s.Config.Network.Socks5Proxy
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if !strings.HasPrefix(socks5URL, "socks5://") {
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socks5URL = "socks5://" + socks5URL
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}
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cfg.Address, cfg.Username, cfg.Password = parseProxyURL(socks5URL, s.Config.Network.Socks5Proxy)
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return cfg
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}
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// 其次 HTTP
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if s.Config.Network.HTTPProxy != "" {
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if strings.HasPrefix(s.Config.Network.HTTPProxy, "https://") {
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cfg.Type = proxy.ProxyTypeHTTPS
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} else {
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cfg.Type = proxy.ProxyTypeHTTP
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}
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cfg.Address, cfg.Username, cfg.Password = parseProxyURL(s.Config.Network.HTTPProxy, s.Config.Network.HTTPProxy)
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return cfg
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}
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cfg.Type = proxy.ProxyTypeNone
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return cfg
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}
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