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In order to prevent memory DoS, we must ensure that we don't accept a new header into memory until we've performed anti-DoS checks, such as verifying that the header is part of a sufficiently high work chain. This commit adds a new argument to AcceptBlockHeader() so that we can ensure that all call-sites which might cause a new header to be accepted into memory have to grapple with the question of whether the header is safe to accept, or needs further validation. This patch also fixes two places where low-difficulty-headers could have been processed without such validation (processing an unrequested block from the network, and processing a compact block). Credit to Niklas Gögge for noticing this issue, and thanks to Sjors Provoost for test code.
Test library
This contains files for the test library, which is used by the test binaries (unit tests, benchmarks, fuzzers, gui tests).
Generally, the files in this folder should be well-separated modules. New code should be added to existing modules or (when in doubt) a new module should be created.
The utilities in here are compiled into a library, which does not hold any state. However, the main file setup_common
defines the common test setup for all test binaries. The test binaries will handle the global state when they
instantiate the BasicTestingSetup (or one of its derived classes).