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	Merge pull request #285 from itviewer/dev
遵循 DPD-REQ 协议,修复 OpenConnect DTLS 的 MTU 探测
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		@@ -64,6 +64,7 @@ func LinkDtls(conn net.Conn, cSess *sessdata.ConnSession) {
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		case 0x03: // DPD-REQ
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			// base.Debug("recv DPD-REQ", cSess.IpAddr)
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			pl.PType = 0x04
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			pl.Data = pl.Data[:n]
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			if payloadOutDtls(cSess, dSess, pl) {
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				return
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			}
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@@ -149,7 +150,7 @@ func dtlsWrite(conn net.Conn, dSess *sessdata.DtlsSession, cSess *sessdata.ConnS
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			}
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		} else {
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			// 设置头类型
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			pl.Data = append(pl.Data[:0], pl.PType)
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			pl.Data[0] = pl.PType
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		}
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		n, err := conn.Write(pl.Data)
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		if err != nil {
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