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Fixed connection map for tcp proxy, battle-tested on M*CTF
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,64 @@ | ||
package tcp | ||
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import ( | ||
"github.com/sirupsen/logrus" | ||
"go.uber.org/atomic" | ||
"net" | ||
"sync" | ||
) | ||
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func newConnMap() *connMap { | ||
return &connMap{ | ||
conns: make(map[string]net.Conn), | ||
mu: new(sync.RWMutex), | ||
seq: new(atomic.Int32), | ||
} | ||
} | ||
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type connMap struct { | ||
conns map[string]net.Conn | ||
mu *sync.RWMutex | ||
seq *atomic.Int32 | ||
} | ||
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func (m *connMap) add(conn net.Conn) string { | ||
id := genConnID(conn, int(m.seq.Inc())) | ||
m.mu.Lock() | ||
defer m.mu.Unlock() | ||
m.conns[id] = conn | ||
return id | ||
} | ||
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func (m *connMap) remove(connID string) { | ||
m.mu.Lock() | ||
defer m.mu.Unlock() | ||
delete(m.conns, connID) | ||
} | ||
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func (m *connMap) length() int { | ||
m.mu.RLock() | ||
defer m.mu.RUnlock() | ||
return len(m.conns) | ||
} | ||
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func (m *connMap) get(connID string) net.Conn { | ||
m.mu.RLock() | ||
defer m.mu.RUnlock() | ||
return m.conns[connID] | ||
} | ||
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func (m *connMap) closeAll(logger *logrus.Entry) { | ||
m.mu.Lock() | ||
defer m.mu.Unlock() | ||
logger.Debugf("Closing %d connections", len(m.conns)) | ||
for id, c := range m.conns { | ||
cl := logger.WithField("conn", id) | ||
if err := c.Close(); err != nil { | ||
if isConnectionClosedErr(err) { | ||
cl.Debugf("Connection already closed: %v", err) | ||
} else { | ||
cl.Errorf("Error closing connection: %v", err) | ||
} | ||
} | ||
} | ||
} |
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