增加了一些 DoS 限制，移除了安全模式（0.3.19）
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DoS 方面还有更多工作要做，但在着手研究更复杂的思路之前，我先把目前已有的内容快速构建一个版本，以备不时之需。这次构建的版本是 0.3.19。
- 增加了一些 DoS 控制 正如加文和我之前明确说过的，这个软件完全不能抵御 DoS 攻击。这是一项改进，但仍然有数不清的攻击方式。
我暂时把 -limitfreerelay 这部分保留为一个开关，如果你需要，可以使用它。
- 移除了“安全模式”警报 “安全模式”警报是 0.3.9 溢出漏洞之后采取的一项临时措施。我们尽可以说用户只要加上“-disablesafemode”运行即可，但为了观感，最好干脆不要有它。它从来就没打算作为长期功能。看到一条更长的（总 PoW 更高的）无效区块链时，安全模式仍然可以被触发。
构建版本： http://sourceforge.net/projects/bitcoin/files/Bitcoin/bitcoin-0.3.19/
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There's more work to do on DoS, but I'm doing a quick build of what I have so far in case it's needed, before venturing into more complex ideas. The build for this is version 0.3.19.
- Added some DoS controls As Gavin and I have said clearly before, the software is not at all resistant to DoS attack. This is one improvement, but there are still more ways to attack than I can count.
I'm leaving the -limitfreerelay part as a switch for now and it's there if you need it.
- Removed "safe mode" alerts "safe mode" alerts was a temporary measure after the 0.3.9 overflow bug. We can say all we want that users can just run with "-disablesafemode", but it's better just not to have it for the sake of appearances. It was never intended as a long term feature. Safe mode can still be triggered by seeing a longer (greater total PoW) invalid block chain.
Builds: http://sourceforge.net/projects/bitcoin/files/Bitcoin/bitcoin-0.3.19/