Async Mode Windows Meterpreter - #807
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Add async mode request handler with business-hours awareness, configurable poll interval with jitter, and interruptible sleep via wake event.
When async mode is enabled, the dispatch loop sleeps for the configured poll interval on empty responses and skips sleep after handling commands to drain queued requests. Outside business hours, the loop pauses with 60s re-checks.
Parse TLV_TYPE_ASYNC_SMART_SYNC in core_async_mode and use it to shorten the ERROR_EMPTY sleep to a 1s burst interval (no jitter) while activity is recent, falling back to poll_interval+jitter once the window elapses. Adds async_touch_activity() and async_in_smart_sync_window() helpers.
Call async_touch_activity() after a successful packet_transmit_http send and after receiving a non-empty request in server_dispatch_http so the smart-sync burst window stays armed across chained request/response cycles.
In async mode, always run commands inline so the response is POSTed before the next GET poll. This lets the dispatch loop drain queued requests in a tight poll-execute-respond cycle, which the smart-sync burst window relies on for chained multi-request commands.
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Framework: rapid7/metasploit-framework#21685