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test: avoid generating non-loopback traffic from p2p_seednode.py

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`p2p_seednode.py` would try to connect to `0.0.0.1` and `0.0.0.2` as
seed nodes. This sends outbound TCP packets on a non-loopback interface
to the default router.

Configure an unavailable proxy for all executions of `bitcoind` during
this test. Also change `0.0.0.1` and `0.0.0.2` because connecting to
them would skip the `-proxy=` setting because for such an address:
* `CNetAddr::IsLocal()` is true, thus
* `CNetAddr::IsRoutable()` is false, thus
* `CNetAddr::GetNetwork()` is `NET_UNROUTABLE`, even though
  `CNetAddr::m_net` is `NET_IPV4`.

This speeds up the execution time of `p2p_seednode.py`
from 12.5s to 2.5s.
This commit is contained in:
Vasil Dimov
2024-11-25 15:36:38 +01:00
parent 35bf426e02
commit 6b3f6eae70
2 changed files with 13 additions and 6 deletions
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4
test/functional/test_framework/netutil.py
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@ -13,6 +13,10 @@ import struct
import array
import os
# Easily unreachable address. Attempts to connect to it will stay within the machine.
# Used to avoid non-loopback traffic or DNS queries.
UNREACHABLE_PROXY_ARG = '-proxy=127.0.0.1:1'
# STATE_ESTABLISHED = '01'
# STATE_SYN_SENT = '02'
# STATE_SYN_RECV = '03'