Problem:
If `FuzzedSock::Recv(N, MSG_PEEK)` is called then `N` bytes would be
retrieved from the fuzz provider, saved in `m_peek_data` and returned
to the caller (ok).
If after this `FuzzedSock::Recv(M, 0)` is called where `M < N`
then the first `M` bytes from `m_peek_data` would be returned
to the caller (ok), but the remaining `N - M` bytes in `m_peek_data`
would be discarded/lost (not ok). They must be returned by a subsequent
`Recv()`.
To resolve this, only remove the head `N` bytes from `m_peek_data`.
Currently, when the FuzzedDataProvider of a FuzzedSock runs out of data,
FuzzedSock::Wait and WaitMany will simulate endless waiting as the
requested events are never simulated as occured.
Fix this by simulating event occurence when ConsumeBool() returns false
(e.g. when the data provider runs out).
Co-authored-by: dergoegge <n.goeggi@gmail.com>
FuzzedSock only supports peeking at one byte at a time, which is not
fuzzer friendly when trying to receive long data.
Fix this by supporting peek data of arbitrary length instead of only one
byte.
In the process of doing so, refactor `ConsumeNetAddr()` to generate the
addresses from IPv4, IPv6, Tor, I2P and CJDNS networks in the same way -
by preparing some random stream and deserializing from it. Similar code
was already found in `RandAddr()`.
7df4508369 test: improve sock_tests/move_assignment (Vasil Dimov)
5086a99b84 net: remove Sock default constructor, it's not necessary (Vasil Dimov)
7829272f78 net: remove now unnecessary Sock::Get() (Vasil Dimov)
944b21b70a net: don't check if the socket is valid in ConnectSocketDirectly() (Vasil Dimov)
aeac68d036 net: don't check if the socket is valid in GetBindAddress() (Vasil Dimov)
5ac1a51ee5 i2p: avoid using Sock::Get() for checking for a valid socket (Vasil Dimov)
Pull request description:
_This is a piece of #21878, chopped off to ease review._
Peeking at the underlying socket file descriptor of `Sock` and checkig if it is `INVALID_SOCKET` is bad encapsulation and stands in the way of testing/mocking/fuzzing.
Instead use an empty `unique_ptr` to denote that there is no valid socket where appropriate or outright remove such checks where they are not necessary.
The default constructor `Sock::Sock()` is unnecessary now after recent changes, thus remove it.
ACKs for top commit:
ajtowns:
ACK 7df4508369
jonatack:
ACK 7df4508369
Tree-SHA512: 9742aeeeabe8690530bf74caa6ba296787028c52f4a3342afd193b05dbbb1f6645935c33ba0a5230199a09af01c666bd3c7fb16b48692a0d185356ea59a8ddbf
This also cleans up the addrman (de)serialization code paths to only
allow `Disk` serialization. Some unit tests previously forced a
`Network` serialization, which does not make sense, because Bitcoin Core
in production will always `Disk` serialize.
This cleanup idea was suggested by Pieter Wuille and implemented by Anthony
Towns.
Co-authored-by: Pieter Wuille <pieter@wuille.net>
Co-authored-by: Anthony Towns <aj@erisian.com.au>
