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Merge #28649: Do the SOCKS5 handshake reliably
af0fca5 netbase: use reliable send() during SOCKS5 handshake (Vasil Dimov) 1b19d11 sock: change Sock::SendComplete() to take Span (Vasil Dimov) Pull request description: The `Socks5()` function which does the SOCKS5 handshake with the SOCKS5 proxy sends bytes to the socket without retrying partial writes. `send(2)` may write only part of the provided data and return. In this case the caller is responsible for retrying the operation with the remaining data. Change `Socks5()` to do that. There is already a method `Sock::SendComplete()` which does exactly that, so use it in `Socks5()`. A minor complication for this PR is that `Sock::SendComplete()` takes `std::string` argument whereas `Socks5()` has `std::vector<uint8_t>`. Thus the necessity for the first commit. It is possible to do also in other ways - convert the data in `Socks5()` to `std::string` or have just one `Sock::SendComplete()` that takes `void*` and change the callers to pass `str.data(), str.size()` or `vec.data(), vec.size()`. This came up while testing #27375. ACKs for top commit: achow101: ACK af0fca5 jonatack: ACK af0fca5 pinheadmz: ACK af0fca5 Tree-SHA512: 1d4a53d0628f7607378038ac56dc3b8624ce9322b034c9547a0c3ce052eafb4b18213f258aa3b57bcb4d990a5e0548a37ec70af2bd55f6e8e6399936f1ce047a
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