27230 Commits

Author SHA1 Message Date
MarcoFalke
1077c93a34
Merge #20692: test: run mempool_resurrect.py even with wallet disabled
11a32722f09f1d81f34bd09b26248ba99f2e7f07 test: run mempool_resurrect.py even with wallet disabled (Michael Dietz)

Pull request description:

  Another functional test rewritten as proposed in #20078

  **Request for help:**
  `node.gettransaction(txid)` fails for transactions sent with `wallet.send_self_transfer`. Even though the `txid`s look correct, are added to the mempool correctly, and removed from the mempool when a block is mined - all as expected.

  However, `node.gettransaction(txid)` throws the error:
  ```sh
  Traceback (most recent call last):
    File "/Users/michaeldietz/Documents/bitcoin/test/functional/test_framework/test_framework.py", line 126, in main
      self.run_test()
    File "/Users/michaeldietz/Documents/bitcoin/test/functional/mempool_resurrect.py", line 43, in run_test
      assert_equal(len(list(filter(lambda txid: node.gettransaction(txid)["confirmations"] > 0, spends_ids))), len(spends_ids))
    File "/Users/michaeldietz/Documents/bitcoin/test/functional/mempool_resurrect.py", line 43, in <lambda>
      assert_equal(len(list(filter(lambda txid: node.gettransaction(txid)["confirmations"] > 0, spends_ids))), len(spends_ids))
    File "/Users/michaeldietz/Documents/bitcoin/test/functional/test_framework/coverage.py", line 47, in __call__
      return_val = self.auth_service_proxy_instance.__call__(*args, **kwargs)
    File "/Users/michaeldietz/Documents/bitcoin/test/functional/test_framework/authproxy.py", line 146, in __call__
      raise JSONRPCException(response['error'], status)
  test_framework.authproxy.JSONRPCException: Invalid or non-wallet transaction id (-5)
  ```

  Anyone know what's going wrong / can point me in the right direction if I'm making a mistake, or `MiniWallet` needs to be improved for this to work correctly?

ACKs for top commit:
  MarcoFalke:
    ACK 11a32722f09f1d81f34bd09b26248ba99f2e7f07

Tree-SHA512: 13d83a13ec23920db716e99b68670e61329d1cc73b12063d85bc1679ee6425a9951da4d2e392ca1f27760be7be049ccdc6f504e192ed5cd24ed0ba003b66fab3
2020-12-21 15:23:57 +01:00
Hennadii Stepanov
1fbb8b6fa3
script: Remove outdated extract-osx-sdk.sh 2020-12-21 15:03:08 +02:00
Wladimir J. van der Laan
68c7acf6bb
Merge #20671: Replace boost::optional with std::optional
fa4435e22f78f632a455016ce00a357009aac059 Replace boost::optional with std::optional (MarcoFalke)
fa7e803f3e4df33117927aef6fef9bfaee4f410d Remove unused MakeOptional (MarcoFalke)
fadd4029dced574778ade228931a7706f92bc676 psbt: Assert that tx has a value in UpdatePSBTOutput (MarcoFalke)

Pull request description:

  Now that we can use std::optional from the vanilla standard library, drop the third-party boost dependency

ACKs for top commit:
  practicalswift:
    cr ACK fa4435e22f78f632a455016ce00a357009aac059: patch looks correct!
  laanwj:
    code review ACK fa4435e22f78f632a455016ce00a357009aac059
  hebasto:
    ACK fa4435e22f78f632a455016ce00a357009aac059, I have reviewed the code and it looks OK, I agree it can be merged.

Tree-SHA512: 50c5a1a130cac65e043e0177ba5b009fc2ba09343af4e23322ff2eb32184a55f8f2dea66e7a1b9d9acf56bc164eef4e47448750549a07f3b661199ac9bf9afef
2020-12-21 13:12:16 +01:00
MarcoFalke
f061da2887
Merge #20697: ci: Fix COMMIT_RANGE variable value for PRs
3c2478c38522c176e81befd4d991a259b09be063 ci: Print COMMIT_RANGE to the log as it was in Travis CI (Hennadii Stepanov)
c123892c2e47e3706f06820aba2454d494a39564 ci: Drop Travis-specific workaround for shellcheck (Hennadii Stepanov)
10af252d97532843b26505d215f6e975f4b21672 ci: Drop Travis-specific way to set COMMIT_RANGE variable (Hennadii Stepanov)
93504da3a932f33126545ebc9383f695a6efe51e ci: Fix COMMIT_RANGE variable value for PRs (Hennadii Stepanov)

Pull request description:

  This PR:
  - is a #20658 and #20682  followup
  - set the `COMMIT_RANGE` variable correctly for PRs
  - cleans up Travis-specific code
  - prints COMMIT_RANGE value to the log for convenience as it was in Travis CI

ACKs for top commit:
  MarcoFalke:
    ACK 3c2478c38522c176e81befd4d991a259b09be063

Tree-SHA512: beb933352b10fd5eb3e66373ddb62439e4f3a03b50fb037ee89fa92c0706cec41d05f2d307f15bb18d1e634e6464f4e123b7e2f88703c8edfd145d8d6eff0b1a
2020-12-21 12:09:16 +01:00
Hennadii Stepanov
3c2478c385
ci: Print COMMIT_RANGE to the log as it was in Travis CI 2020-12-21 12:13:43 +02:00
Hennadii Stepanov
c123892c2e
ci: Drop Travis-specific workaround for shellcheck 2020-12-21 12:11:00 +02:00
Hennadii Stepanov
10af252d97
ci: Drop Travis-specific way to set COMMIT_RANGE variable 2020-12-21 12:10:59 +02:00
Hennadii Stepanov
93504da3a9
ci: Fix COMMIT_RANGE variable value for PRs 2020-12-21 12:10:43 +02:00
MarcoFalke
e9efb64a07
Merge #20733: inline non-member functions with body in fuzzing headers
d8b9cec25b1d851b711a76f08aed6bce9be933d4 inline non-member functions with body in fuzzing headers (Patrick Strateman)

Pull request description:

  Resolves the issue noted [here](https://github.com/bitcoin/bitcoin/pull/20560#issuecomment-748339644)

ACKs for top commit:
  MarcoFalke:
    ACK d8b9cec25b1d851b711a76f08aed6bce9be933d4

Tree-SHA512: fb34707e2d2c5b664d4160e0e4b56e3df9fb2c9045da6ddea7139e0b4982262c4e085812a8543a6221febc9cd0815423b8287fec66baae3236e5f3339cc9df8c
2020-12-21 08:13:08 +01:00
Patrick Strateman
d8b9cec25b inline non-member functions with body in fuzzing headers 2020-12-20 18:19:43 -05:00
Fabian Jahr
0b4d290bf5
crypto: Add Num3072 implementation
Num3072 is a specialized bignum implementation used in MuHash3072.

Co-authored-by: Pieter Wuille <pieter.wuille@gmail.com>
2020-12-20 23:27:58 +01:00
Fabian Jahr
589f958662
build: Check for 128 bit integer support
Used in MuHash3072 implementation.

Co-authored-by: Pieter Wuille <pieter.wuille@gmail.com>
2020-12-20 22:08:15 +01:00
John Newbery
3002b4af2b [net processing] Guard m_continuation_block with m_block_inv_mutex 2020-12-20 10:06:14 +00:00
John Newbery
184557e8e0 [net processing] Move hashContinue to net processing
Also rename to m_continuation_block to better communicate meaning.
2020-12-20 10:03:38 +00:00
John Newbery
c853ef002e scripted-diff: rename vBlockHashesToAnnounce and vInventoryBlockToSend
-BEGIN VERIFY SCRIPT-
sed -i 's/vBlockHashesToAnnounce/m_blocks_for_headers_relay/g' src/net_processing.*
sed -i 's/vInventoryBlockToSend/m_blocks_for_inv_relay/g' src/net_processing.*
-END VERIFY SCRIPT-
2020-12-20 10:01:48 +00:00
John Newbery
53b7ac1b7d [net processing] Move block inventory data to Peer 2020-12-20 10:01:48 +00:00
John Newbery
78040f9168 [net processing] Rename nStartingHeight to m_starting_height
Not done as a scripted diff to avoid misnaming the local variable in
ProcessMessage().
2020-12-20 10:01:46 +00:00
John Newbery
77a2c2f8f9 [net processing] Move nStartingHeight to Peer 2020-12-20 10:01:26 +00:00
John Newbery
717a374e74 [net processing] Improve documentation for Peer destruction/locking
Suggested here:

- https://github.com/bitcoin/bitcoin/pull/19607#discussion_r467071878
- https://github.com/bitcoin/bitcoin/pull/19829#discussion_r546116786
2020-12-19 14:49:03 +00:00
MarcoFalke
fa4435e22f
Replace boost::optional with std::optional 2020-12-19 09:46:55 +01:00
MarcoFalke
fa7e803f3e
Remove unused MakeOptional
The only use was to work around a compiler warning in an ancient
compiler, which we no longer support.
2020-12-19 09:45:58 +01:00
MarcoFalke
fadd4029dc
psbt: Assert that tx has a value in UpdatePSBTOutput
This was previously done implicitly in boost::optional by BOOST_ASSERT.
Also, it was checked at runtime by valgrind if for some reason the
assert was disabled.

std::optional dereference won't assert, so add the Assert here
explicitly.

The explicit Assert also helps to document the code better.
2020-12-19 09:45:39 +01:00
Wladimir J. van der Laan
f1dbf92ff0
Merge #20434: contrib: Parse ELF directly for symbol and security checks
a0a771843fc39c3cc2574a51f009c3391e1808e9 contrib: Changes to checks for PowerPC64 (Luke Dashjr)
634f6ec4eb9997d7bd0f8209fad49a4171d42384 contrib: Parse ELF directly for symbol and security checks (Wladimir J. van der Laan)

Pull request description:

  Instead of the ever-messier text parsing of the output of the readelf tool (which is clearly meant for human consumption not to be machine parseable), parse the ELF binaries directly.

  Add a small dependency-less ELF parser specific to the checks.

  This is slightly more secure, too, because it removes potential ambiguity due to misparsing and changes in the output format of `elfread`. It also allows for stricter and more specific ELF format checks in the future.

  This removes the build-time dependency for `readelf`.

  It passes the test-security-check for me locally, ~~though I haven't checked on all platforms~~. I've checked that this works on the cross-compile output for all ELF platforms supported by Bitcoin Core at the moment, as well as PPC64 LE and BE.

Top commit has no ACKs.

Tree-SHA512: 7f9241fec83ee512642fecf5afd90546964561efd8c8c0f99826dcf6660604a4db2b7255e1afb1e9bb0211fd06f5dbad18a6175dfc03e39761a40025118e7bfc
2020-12-18 12:16:40 +01:00
MarcoFalke
83e4670fd7
Merge #20690: Clean up logging of outbound connection type
6d1e85f475a8af3ca0e094ed101dc19704e5ab74 Clean up logging of outbound connection type (Suhas Daftuar)

Pull request description:

  We have a function that converts `ConnectionType` enums to strings, so use it.

  Suggested by ajtowns in https://github.com/bitcoin/bitcoin/pull/19858#discussion_r540791588

ACKs for top commit:
  amitiuttarwar:
    ACK 6d1e85f475a8af3ca0e094ed101dc19704e5ab74
  naumenkogs:
    ACK 6d1e85f

Tree-SHA512: f5084d8b5257380696d9fde86a8873e190cd4553feb07fa49df39bbd9510bf5832d190a3bca1571c48370d16a17c7a34900857b21b27bec0777bfa710211d7bb
2020-12-18 10:02:55 +01:00
MarcoFalke
20f4a9421b
Merge #20682: ci: Install missing lint packages
faeb40bee3bca9477785659d89af53cafa2333b5 ci: Install missing lint packages (MarcoFalke)

Pull request description:

  The cirrus container is vanilla ubuntu, so we need to install the needed packages

ACKs for top commit:
  hebasto:
    ACK faeb40bee3bca9477785659d89af53cafa2333b5, I have reviewed the code and it looks OK, I agree it can be merged.

Tree-SHA512: e56198108e26ea0ba2a344b1b74bc294652f34e9866cca053a25fb1b83bbd87ea40254c340e5e169fdfcbd4dcb39fdc2078b5157ca729a22a9a1792ec514a33e
2020-12-18 09:53:38 +01:00
MarcoFalke
3dd3f7c0af
Merge bitcoin-core/gui#155: Fix checkbox layout in Create Wallet dialog
e71b656f317f38ef0ba0874736f116dae39efc67 qt: Align layout of checkboxes (Hennadii Stepanov)

Pull request description:

  From https://github.com/bitcoin/bitcoin/issues/20555#issuecomment-747742627:
  > 0.21.0rc3 compiled from source, Ubuntu 20.04 + i3: tested mainnet, testnet, and signet. created a descriptor wallet in qt, tested torv3 with addnode, and checked if anchors.dat is created on shutdown and removed on startup.
  >
  > I've noticed the "Advanced options" label being cut-off in the wallet creation dialog.

  This PR should fix this issue.

ACKs for top commit:
  MarcoFalke:
    review ACK e71b656f317f38ef0ba0874736f116dae39efc67

Tree-SHA512: dcc997a440a96fc936296323afaf9f4040ac06cf5ad32724a88c2e2e16c726c35b1b2bacbb3e081839d8a69b5a6086b2570d6b2e98976f29b5427db2d434eee9
2020-12-18 08:53:38 +01:00
MarcoFalke
b27104dc52
Merge #20687: wallet: Add missing check for -descriptors wallet tool option
fae32f295cc5b57c1cb95090bb60cddb42f9778a wallet: Add missing check for -descriptors wallet tool option (MarcoFalke)
faf8f61368696b9cbbea55ead30d6a48203235ff test: Add missing check for is_sqlite_compiled (MarcoFalke)
fa7dde1c418e2e700853bd30cc9e012c4e4c5ef2 wallet: Pass ArgsManager into ExecuteWalletToolFunc instead of using global (MarcoFalke)

Pull request description:

  Also, fix a test failure when compiled without sqlite

ACKs for top commit:
  ryanofsky:
    Code review ACK fae32f295cc5b57c1cb95090bb60cddb42f9778a. Thanks for implementing the -descriptors check and dealing with the test failure!
  jonatack:
    Code review utACK fae32f295cc5b57c1cb95090bb60cddb42f9778a

Tree-SHA512: 3d7710694085822739a8316e4abc6db270799ca6ff6b0f9e5563ae240da65ae6a9cab7ba2647feae6ba540dac40b55b38ed41c8f6ed0bf02a3d1536284448927
2020-12-18 07:56:15 +01:00
MarcoFalke
faeb40bee3
ci: Install missing lint packages
Also merge script into ci/lint_run_all.sh because env vars weren't
exported properly
2020-12-18 07:40:57 +01:00
MarcoFalke
9b28bd73a3
Merge #20691: ci, doc: Travis CI features and mentions cleanup
95487b055328b590ba83f258de9637ab0f9a2f17 doc: Drop mentions of Travis CI as it is no longer used (Hennadii Stepanov)
09d105ef0f8b4b06bf248721a1209c9e16e9db75 ci: Drop travis_fold feature as Travis CI is no longer used (Hennadii Stepanov)

Pull request description:

  As Travis CI is no longer used, this PR:
  - drops `travis_fold` feature
  - drops mentions of Travis CI in docs

ACKs for top commit:
  MarcoFalke:
    ACK 95487b055328b590ba83f258de9637ab0f9a2f17

Tree-SHA512: 2e259bb8b1e37bcefc1251737bb2716f06ddb57c490010b373825c4e70f42ca38efae69a2f63f21f577d7cee3725b94097bdddbd313f8ebf499281cf97c53cef
2020-12-18 07:32:28 +01:00
Michael Dietz
11a32722f0
test: run mempool_resurrect.py even with wallet disabled 2020-12-17 21:37:07 -06:00
Hennadii Stepanov
e71b656f31
qt: Align layout of checkboxes 2020-12-18 01:36:21 +02:00
Hennadii Stepanov
95487b0553
doc: Drop mentions of Travis CI as it is no longer used 2020-12-18 01:15:53 +02:00
Wladimir J. van der Laan
816314ef0f
Merge #20644: Add patch to make codesign_allocate compatible with Apple's
a4118c6e200e02e7560f8bc213697aa2909d95b1 Add patch to make codesign_allocate compatible with Apple's (Pieter Wuille)

Pull request description:

  This is an alternative to #20638.

  The problem is that Apple's codesign(_allocate) apparently rounds the "vmsize" attribute on the __LINKEDIT section to a multiple of 0x2000 on x86_64 rather than 0x1000 (as their published source code does). This divergence means that the binary signed by codesign is slightly different from the one recreated by our reattach-sig-to-gitian-output process, and the signature being invalid.

  This fixes it by patching our codesign_allocate source code to also use 0x2000. In tests, this appears to result in matching binaries.

ACKs for top commit:
  jonasschnelli:
    Tested ACK a4118c6e200e02e7560f8bc213697aa2909d95b1 - removed the osx cache, built commit a4118c6e200e02e7560f8bc213697aa2909d95b1 for osx in gitian (dependency where built, patch was applied), signed on my signing mac (detach-sig-create), ran gitian osx signer with the produces signature and the a4118c6e200e02e7560f8bc213697aa2909d95b1 build (detach-sig-apply), signature then was successful verified on my Mac (codesign -v /Volumes/Bitcoin-Core/Bitcoin-Qt.app)
  MarcoFalke:
    Concept ACK a4118c6e200e02e7560f8bc213697aa2909d95b1

Tree-SHA512: 07b8cdf8216249ddfe4bd38b39f2b48b2e190d4002b84d8981e62197bbbc9f25ac5c137bcc32057b23fbf38cbb2889ef95101ce008edfbf608cd170b88b3acbc
2020-12-17 21:34:35 +01:00
Hennadii Stepanov
09d105ef0f
ci: Drop travis_fold feature as Travis CI is no longer used 2020-12-17 22:02:12 +02:00
MarcoFalke
fae32f295c
wallet: Add missing check for -descriptors wallet tool option 2020-12-17 20:36:41 +01:00
MarcoFalke
faf8f61368
test: Add missing check for is_sqlite_compiled 2020-12-17 20:33:45 +01:00
Suhas Daftuar
6d1e85f475 Clean up logging of outbound connection type 2020-12-17 14:00:42 -05:00
Jon Atack
86c495223f
net: add CNode::IsInboundOnion() public getter and unit tests 2020-12-17 19:56:12 +01:00
Jon Atack
6609eb8cb5
net: assert CNode::m_inbound_onion is inbound in ctor
and drop an unneeded check in CNode::ConnectedThroughNetwork()
2020-12-17 19:56:10 +01:00
Jon Atack
993d1ecd19
test, fuzz: fix constructing CNode with invalid inbound_onion
as CNode ctor should only be passed inbound_onion = true
when the connection is inbound
2020-12-17 19:56:00 +01:00
MarcoFalke
b7136c11ab
Merge #20686: fuzz, refactor: replace CNode code with fuzz/util.h::ConsumeNode()
23d8f346896c806581189c9eb870c7833c09f5be fuzz: replace CNode code with fuzz/util.h::ConsumeNode() (Jon Atack)

Pull request description:

  Noticed this while updating the CNode fuzzing in #20210.

  - cc26fab48d76a813d798657b18ae1af08a301150 created `test/fuzz/net.cpp` in May 2020

  - 79ef8324d4c85ed16a304e98805724b8a created a CNode factory utility `test/fuzz/util.h::ConsumeNode()` in October 2020

  This PR updates `fuzz/net.cpp` from the first commit to use `ConsumeNode()` from the second commit.

ACKs for top commit:
  MarcoFalke:
    ACK 23d8f346896c806581189c9eb870c7833c09f5be

Tree-SHA512: 26f7685395b3d48fcf40dde0d479d5c2fb4e953ec9371940b19eee16bb30aee4840b081e1a918b924a9704c1bef484302ea3e8fe63819a3bba73e7eb805164f1
2020-12-17 19:47:28 +01:00
MarcoFalke
fa7dde1c41
wallet: Pass ArgsManager into ExecuteWalletToolFunc instead of using global 2020-12-17 19:16:00 +01:00
Jon Atack
23d8f34689
fuzz: replace CNode code with fuzz/util.h::ConsumeNode() 2020-12-17 18:49:30 +01:00
Wladimir J. van der Laan
190d3d8a75
Merge #20681: doc: Convert depends options list from html to markdown
7b6887e75aec7e0d5c25682c26943073b7a728e5 doc: Convert depends options list from html to markdown (Wladimir J. van der Laan)

Pull request description:

  This makes it easier to read in `less`, which is important for install instructions.

  Rendered: [before](7ef6b1c51d/depends (dependency-options)) - [after](d97042406f/depends/README.md (dependency-options))

ACKs for top commit:
  jonatack:
    Code review re-ACK 7b6887e75aec7e0d5c25682c26943073b7a728e5 per `git diff d970424 7b6887e`
  hebasto:
    re-ACK 7b6887e75aec7e0d5c25682c26943073b7a728e5

Tree-SHA512: 02970b2bb97d2e8fb2d66470f6d70662653fda176bf6f4861742823b361fdc7ab6a2b44143480ac1a525b8d7808b6a068e8b3677dbba16cd783b4cab90470af5
2020-12-17 18:49:26 +01:00
MarcoFalke
143bd108ed
Merge #19137: wallettool: Add dump and createfromdump commands
23cac24dd3f2aaf88aab978e7ef4905772815cd2 tests: Test bitcoin-wallet dump and createfromdump (Andrew Chow)
a88c320041bd1cd1786b2dfd9ab698a67c2a57c6 wallettool: Add createfromdump command (Andrew Chow)
e1e7a90d5f0616a46ffadd62a9f1c65406cca6b4 wallettool: Add dump command (Andrew Chow)

Pull request description:

  Adds two commands to the `bitcoin-wallet` tool: `dump` and `createfromdump`. These commands will be useful for a wallet storage migration in the future. It is also generally useful to have a storage agnostic dump like this. These commands are similar to BDB's `db_dump` and `db_load` tools. This can also be useful for manual construction of a wallet file for tests.

  `dump` outputs every key-value pair from the wallet as comma separated hex. Each key-value pair is on its own line with the key and value in hex separated by a comma. This is output to the file specified by the new `-dumpfile` option.

  `createfromdump` takes a file produced by `dump` and creates a new wallet file with exactly the records specified in that file.

  A new option `-dumpfile` is added to the wallet tool. When used with `dump`, the records will be written to the specified file. When used with `createfromdump`, the file is read and the key-value pairs constructed from it. `createfromdump` requires `-dumpfile`.

  A simple round-trip test is added to the `tool_wallet.py`.

  This PR is based on #19334,

ACKs for top commit:
  Sjors:
    re-utACK 23cac24
  MarcoFalke:
    re review ACK 23cac24dd3f2aaf88aab978e7ef4905772815cd2 only change is rebase and removing useless shared_ptr wrapper 🎼
  ryanofsky:
    Code review ACK 23cac24dd3f2aaf88aab978e7ef4905772815cd2. Only changes since last review rebase and changing a pointer to a reference

Tree-SHA512: 2d63cf62baca3d16495aa698dc02f7d889c81b41015e9c92c23c275bb4a690fc176d351c3fd7f310bd6b17f5a936cc9be694cbecd702af741b96c0f530e72fa2
2020-12-17 15:18:37 +01:00
MarcoFalke
fab46b34f4
test: Fix restart node race 2020-12-17 15:06:31 +01:00
Wladimir J. van der Laan
af4ce674da
Merge #20635: fix misleading comment about call to non-existing function
cc3044ccdbefa9fae58d1762477e377883b39c5e fix misleading comment about call to non-existing function (pox)

Pull request description:

  The comment seems to be describing the subsequent call to `SyncTransaction` but refers to it as `SyncNotifications`, which is not any function currently in the codebase.

  It's best to just remove the "what" aspect of the comment and focus on the "why", which also reduces the risk of similar documentation errors in the future, in case the function ever gets renamed, for example.

ACKs for top commit:
  laanwj:
    ACK cc3044ccdbefa9fae58d1762477e377883b39c5e

Tree-SHA512: 882ff17836ef585a603dc504f3dd21f56f682e49b28a0998f23fd16025826fbb083b7978db3ee70d0e0ff2c86fd6c3fd99a2361e5d45c765fdc5822c5f14c0a7
2020-12-17 15:06:01 +01:00
Hennadii Stepanov
5e0dedb111
build: Define .INTERMEDIATE target once only 2020-12-17 14:10:52 +02:00
Wladimir J. van der Laan
7b6887e75a doc: Convert depends options list from html to markdown
This makes it easier to read in `less`, which is important for install
instructions.
2020-12-17 13:00:36 +01:00
Wladimir J. van der Laan
cfbfd389f6
Merge #20668: doc: warn that incoming conns are unlikely when not using default ports
010eed3ce03cf4fc622a48f40fc4d589383f7a44 doc: warn that incoming conns are unlikely when not using default ports (Adam Jonas)

Pull request description:

  Closes #5150.

  This was mostly copied from #5285 by sulks, who has since quit GitHub.

  The issue has remained open for 6 years, but the extra explanation still seems useful.

ACKs for top commit:
  laanwj:
    re-ACK 010eed3ce03cf4fc622a48f40fc4d589383f7a44

Tree-SHA512: d240fb06bba41ad8898ced59356c10adefc09f3abb33e277f8e2c5980b40678f2d237f286b476451bb29d2b94032a7dee2ada3b2efe004ed1c2509e70b48e40f
2020-12-17 12:10:00 +01:00