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Prevent sending double-EOF in raw backend.
You can't call sk_write_eof() twice on the same socket, because the second one will fail an assertion. Instead, you're supposed to know you've already sent EOF, and not try to send it again. The call to sk_write_eof() in raw_special (triggered by pressing ^D in GUI PuTTY, for example) sets the flag raw->sent_socket_eof in an attempt to prevent this. But it doesn't _check_ that flag, so a second press of ^D can reach that assertion failure.
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@ -285,7 +285,8 @@ static void raw_special(Backend *be, SessionSpecialCode code, int arg)
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{
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Raw *raw = container_of(be, Raw, backend);
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if (code == SS_EOF && raw->s) {
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sk_write_eof(raw->s);
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if (!raw->sent_socket_eof)
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sk_write_eof(raw->s);
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raw->sent_socket_eof= true;
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raw_check_close(raw);
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}
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