16d6113f4f Refactor message transport packaging (Jonas Schnelli)
Pull request description:
This PR factors out transport packaging logic from `CConnman::PushMessage()`.
It's similar to #16202 (where we refactor deserialization).
This allows implementing a new message transport protocol like BIP324.
ACKs for top commit:
dongcarl:
ACK 16d6113f4f FWIW
ariard:
Code review ACK 16d6113
elichai:
semiACK 16d6113f4f ran functional+unit tests.
MarcoFalke:
ACK 16d6113f4f🙎
Tree-SHA512: 8c2f8ab9f52e9b94327973ae15019a08109d5d9f9247492703a842827c5b5d634fc0411759e0bb316d824c586614b0220c2006410851933613bc143e58f7e6c1
3c1bc40205 Add extra logging of asmap use and bucketing (Gleb Naumenko)
e4658aa8ea Return mapped AS in RPC call getpeerinfo (Gleb Naumenko)
ec45646de9 Integrate ASN bucketing in Addrman and add tests (Gleb Naumenko)
8feb4e4b66 Add asmap utility which queries a mapping (Gleb Naumenko)
Pull request description:
This PR attempts to solve the problem explained in #16599.
A particular attack which encouraged us to work on this issue is explained here [[Erebus Attack against Bitcoin Peer-to-Peer Network](https://erebus-attack.comp.nus.edu.sg/)] (by @muoitranduc)
Instead of relying on /16 prefix to diversify the connections every node creates, we would instead rely on the (ip -> ASN) mapping, if this mapping is provided.
A .map file can be created by every user independently based on a router dump, or provided along with the Bitcoin release. Currently we use the python scripts written by @sipa to create a .map file, which is no larger than 2MB (awesome!).
Here I suggest adding a field to peers.dat which would represent a hash of asmap file used while serializing addrman (or 0 for /16 prefix legacy approach).
In this case, every time the file is updated (or grouping method changed), all buckets will be re-computed.
I believe that alternative selective re-bucketing for only updated ranges would require substantial changes.
TODO:
- ~~more unit tests~~
- ~~find a way to test the code without including >1 MB mapping file in the repo.~~
- find a way to check that mapping file is not corrupted (checksum?)
- comments and separate tests for asmap.cpp
- make python code for .map generation public
- figure out asmap distribution (?)
~Interesting corner case: I’m using std::hash to compute a fingerprint of asmap, and std::hash returns size_t. I guess if a user updates the OS to 64-bit, then the hash of asap will change? Does it even matter?~
ACKs for top commit:
laanwj:
re-ACK 3c1bc40205
jamesob:
ACK 3c1bc40205 ([`jamesob/ackr/16702.3.naumenkogs.p2p_supplying_and_using`](https://github.com/jamesob/bitcoin/tree/ackr/16702.3.naumenkogs.p2p_supplying_and_using))
jonatack:
ACK 3c1bc40205
Tree-SHA512: e2dc6171188d5cdc2ab2c022fa49ed73a14a0acb8ae4c5ffa970172a0365942a249ad3d57e5fb134bc156a3492662c983f74bd21e78d316629dcadf71576800c
-BEGIN VERIFY SCRIPT-
# Delete outdated alias for RecursiveMutex
sed -i -e '/CCriticalSection/d' ./src/sync.h
# Replace use of outdated alias with RecursiveMutex
sed -i -e 's/CCriticalSection/RecursiveMutex/g' $(git grep -l CCriticalSection)
-END VERIFY SCRIPT-
Instead of using /16 netgroups to bucket nodes in Addrman for connection
diversification, ASN, which better represents an actor in terms
of network-layer infrastructure, is used.
For testing, asmap.raw is used. It represents a minimal
asmap needed for testing purposes.
b6d2183858 Minor refactoring to remove implied m_addr_relay_peer. (User)
a552e8477c added asserts to check m_addr_known when it's used (User)
090b75c14b p2p: Avoid allocating memory for addrKnown where we don't need it (User)
Pull request description:
We should allocate memory for addrKnown filter only for those peers which are expected to participate in address relay.
Currently, we do it for all peers (including SPV and block-relay-only), which results in extra RAM where it's not needed.
Upd:
In future, we would still allow SPVs to ask for addrs, so allocation still will be done by default.
However, they will be able to opt-out via [this proposal](https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2019-October/017428.html) and then we could save some more memory.
This PR still saves memory for block-relay-only peers immediately after merging.
Top commit has no ACKs.
Tree-SHA512: e84d93b2615556d466f5ca0e543580fde763911a3bfea3127c493ddfaba8f05c8605cb94ff795d165af542b594400995a2c51338185c298581408687e7812463
c72906dcc1 refactor: Remove redundant c_str() calls in formatting (Wladimir J. van der Laan)
Pull request description:
Our formatter, tinyformat, *never* needs `c_str()` for strings. Still, many places call it redundantly, resulting in longer code and a slight overhead.
Remove redundant `c_str()` calls for:
- `strprintf`
- `LogPrintf`
- `tfm::format`
(also, combined with #17095, I think this improves logging in case of unexpected embedded NULL characters)
ACKs for top commit:
ryanofsky:
Code review ACK c72906dcc1. Easy to review with `git log -p -n1 --word-diff-regex=. -U0 c72906dcc11a73fa06a0adf97557fa756b551bee`
Tree-SHA512: 9e21e7bed8aaff59b8b8aa11571396ddc265fb29608c2545b1fcdbbb36d65b37eb361db6688dd36035eab0c110f8de255375cfda50df3d9d7708bc092f67fefc
ed2dc5e48a Add override/final modifiers to V1TransportDeserializer (Pieter Wuille)
f342a5e61a Make resetting implicit in TransportDeserializer::Read() (Pieter Wuille)
6a91499496 Remove oversized message detection from log and interface (Pieter Wuille)
b0e10ff4df Force CNetMessage::m_recv to use std::move (Jonas Schnelli)
efecb74677 Use adapter pattern for the network deserializer (Jonas Schnelli)
1a5c656c31 Remove transport protocol knowhow from CNetMessage / net processing (Jonas Schnelli)
6294ecdb8b Refactor: split network transport deserializing from message container (Jonas Schnelli)
Pull request description:
**This refactors the network message deserialization.**
* It transforms the `CNetMessage` into a transport protocol agnostic message container.
* A new class `TransportDeserializer` (unique pointer of `CNode`) is introduced, handling the network buffer reading and the decomposing to a `CNetMessage`
* **No behavioral changes** (in terms of disconnecting, punishing)
* Moves the checksum finalizing into the `SocketHandler` thread (finalizing was in `ProcessMessages` before)
The **optional last commit** makes the `TransportDeserializer` following an adapter pattern (polymorphic interface) to make it easier to later add a V2 transport protocol deserializer.
Intentionally not touching the sending part.
Pre-Requirement for BIP324 (v2 message transport protocol).
Replacement for #14046 and inspired by a [comment](https://github.com/bitcoin/bitcoin/pull/14046#issuecomment-431528330) from sipa
ACKs for top commit:
promag:
Code review ACK ed2dc5e48a.
marcinja:
Code review ACK ed2dc5e48a
ryanofsky:
Code review ACK ed2dc5e48a. 4 cleanup commits added since last review. Unaddressed comments:
ariard:
Code review and tested ACK ed2dc5e.
Tree-SHA512: bab8d87464e2e8742529e488ddcdc8650f0c2025c9130913df00a0b17ecdb9a525061cbbbd0de0251b76bf75a8edb72e3ad0dbf5b79e26f2ad05d61b4e4ded6d
6170ec5d3a Do not query all DNS seed at once (Pieter Wuille)
Pull request description:
Before this PR, when we don't have enough connections after 11 seconds, we proceed to query all DNS seeds in a fixed order, loading responses from all of them.
Change this to to only query three randomly-selected DNS seed. If 11 seconds later we still don't have enough connections, try again with another one, and so on.
This reduces the amount of information DNS seeds can observe about the requesters by spreading the load over all of them.
ACKs for top commit:
Sjors:
ACK 6170ec5d3
sdaftuar:
ACK 6170ec5d3a
jonasschnelli:
utACK 6170ec5d3a - I think the risk of a single seeder codebase is orthogonal to this PR. Such risks could also be interpreted differently (diversity could also increase the risk based on the threat model).
fanquake:
ACK 6170ec5d3a - Agree with the reasoning behind the change. Did some testing with and without `-forcednsseed` and/or a `peers.dat` and monitored the DNS activity.
Tree-SHA512: 33f6be5f924a85d312303ce272aa8f8d5e04cb616b4b492be98832e3ff37558d13d2b16ede68644ad399aff2bf5ff0ad33844e55eb40b7f8e3fddf9ae43add57
0ba08020c9 Disconnect peers violating blocks-only mode (Suhas Daftuar)
937eba91e1 doc: improve comments relating to block-relay-only peers (Suhas Daftuar)
430f489027 Don't relay addr messages to block-relay-only peers (Suhas Daftuar)
3a5e885306 Add 2 outbound block-relay-only connections (Suhas Daftuar)
b83f51a4bb Add comment explaining intended use of m_tx_relay (Suhas Daftuar)
e75c39cd42 Check that tx_relay is initialized before access (Suhas Daftuar)
c4aa2ba822 [refactor] Change tx_relay structure to be unique_ptr (Suhas Daftuar)
4de0dbac9b [refactor] Move tx relay state to separate structure (Suhas Daftuar)
26a93bce29 Remove unused variable (Suhas Daftuar)
Pull request description:
Transaction relay is optimized for a combination of redundancy/robustness as well as bandwidth minimization -- as a result transaction relay leaks information that adversaries can use to infer the network topology.
Network topology is better kept private for (at least) two reasons:
(a) Knowledge of the network graph can make it easier to find the source IP of a given transaction.
(b) Knowledge of the network graph could be used to split a target node or nodes from the honest network (eg by knowing which peers to attack in order to achieve a network split).
We can eliminate the risks of (b) by separating block relay from transaction relay; inferring network connectivity from the relay of blocks/block headers is much more expensive for an adversary.
After this commit, bitcoind will make 2 additional outbound connections that are only used for block relay. (In the future, we might consider rotating our transaction-relay peers to help limit the effects of (a).)
ACKs for top commit:
sipa:
ACK 0ba08020c9
ajtowns:
ACK 0ba08020c9 -- code review, ran tests. ran it on mainnet for a couple of days with MAX_BLOCKS_ONLY_CONNECTIONS upped from 2 to 16 and didn't observe any unexpected behaviour: it disconnected a couple of peers that tried sending inv's, and it successfully did compact block relay with some block relay peers.
TheBlueMatt:
re-utACK 0ba08020c9. Pointed out that stats.fRelayTxes was sometimes uninitialized for blocksonly peers (though its not a big deal and only effects RPC), which has since been fixed here. Otherwise changes are pretty trivial so looks good.
jnewbery:
utACK 0ba08020c9
jamesob:
ACK 0ba08020c9
Tree-SHA512: 4c3629434472c7dd4125253417b1be41967a508c3cfec8af5a34cad685464fbebbb6558f0f8f5c0d4463e3ffa4fa3aabd58247692cb9ab8395f4993078b9bcdf
Transaction relay is primarily optimized for balancing redundancy/robustness
with bandwidth minimization -- as a result transaction relay leaks information
that adversaries can use to infer the network topology.
Network topology is better kept private for (at least) two reasons:
(a) Knowledge of the network graph can make it easier to find the source IP of
a given transaction.
(b) Knowledge of the network graph could be used to split a target node or
nodes from the honest network (eg by knowing which peers to attack in order to
achieve a network split).
We can eliminate the risks of (b) by separating block relay from transaction
relay; inferring network connectivity from the relay of blocks/block headers is
much more expensive for an adversary.
After this commit, bitcoind will make 2 additional outbound connections that
are only used for block relay. (In the future, we might consider rotating our
transaction-relay peers to help limit the effects of (a).)
59cb722fd0 Update configure to reject unsafe miniUPnPc API ver (Hennadii Stepanov)
ab2190557e doc: Add release notes for 15993 (Hennadii Stepanov)
02709e9560 Align formatting with clang-format (Hennadii Stepanov)
91a1b85083 Use PACKAGE_NAME in UPnP description (Hennadii Stepanov)
9f76e45b9d Drop support of insecure miniUPnPc versions (Hennadii Stepanov)
Pull request description:
1. Minimum supported miniUPnPc API version is set to 10:
- https://packages.ubuntu.com/xenial/libminiupnpc-dev
- https://packages.debian.org/jessie/libminiupnpc-dev
Refs:
- #6583
- #6789
- #10414
2. The hardcoded "Bitcoin" replaced with `PACKAGE_NAME`:
3. Also style-only commit applied.
Pardon: could not reopen my previous PR #15966.
ACKs for top commit:
ryanofsky:
utACK 59cb722fd0. Changes since last review: adding a new commit which updates configure script to fall back to disabling upnp if version is too old, adding a requested comment explaining static_assert condition, and fixing a spelling (jessy/jessie)
Tree-SHA512: 42ed11bc2fb2ec83d5dd58e2383da5444a24fd572707f6cf10b622cb8943e28adfcca4750d06801024c4472625b5ea9279516fbd9d2ccebc9bbaafe1d148e80d
-BEGIN VERIFY SCRIPT-
sed -i 's/inline std::string _(const char\* psz)/inline bilingual_str _(const char\* psz)/' src/util/translation.h
sed -i 's/return G_TRANSLATION_FUN ? (G_TRANSLATION_FUN)(psz) : psz;/return bilingual_str{psz, G_TRANSLATION_FUN ? (G_TRANSLATION_FUN)(psz) : psz};/' src/util/translation.h
sed -i 's/\b_("\([^"]\|\\"\)*")/&.translated/g' $(git grep --files-with-matches '\b_("' src)
echo Hard cases - multiline strings.
sed -i 's/"Visit %s for further information about the software.")/&.translated/g' src/init.cpp
sed -i "s/\"Only rebuild the block database if you are sure that your computer's date and time are correct\")/&.translated/g" src/init.cpp
sed -i 's/" restore from a backup.")/&.translated/g' src/wallet/db.cpp
sed -i 's/" or address book entries might be missing or incorrect.")/&.translated/g' src/wallet/wallet.cpp
echo Special case.
sed -i 's/_(COPYRIGHT_HOLDERS)/&.translated/' src/util/system.cpp test/lint/lint-format-strings.py
-END VERIFY SCRIPT-
Fixes a bug where feelers could be stuck trying to resolve a collision in the
tried table that is to an address in the same netgroup as an existing outbound peer.
Thanks to Muoi Tran for the original bug report and detailed debug logs to track
this down.
0164b0f5cf build: Remove WINVER pre define in Makefile.leveldb.inlcude (Chun Kuan Lee)
d0522ec94e Drop defunct Windows compat fixes (Ben Woosley)
d8a2992067 windows: Call SetProcessDEPPolicy directly (Chun Kuan Lee)
1bd9ffdd44 windows: Set _WIN32_WINNT to 0x0601 (Windows 7) (Chun Kuan Lee)
Pull request description:
The current minimum support Windows version is Vista. So set it to 0x0600
5a88def8ad/mingw-w64-headers/include/sdkddkver.h (L19)
Tree-SHA512: 38e2afc79426ae547131c8ad3db2e0a7f54a95512f341cfa0c06e4b2fe79521ae67d2795ef96b0192e683e4f1ba6183c010d7b4b8d6b3e68b9bf48c374c59e7d
This allows incoming connections from peers which are only banned
due to an automatic misbehavior ban if doing so won't fill inbound.
These peers are preferred for eviction when inbound fills, but may
still be kept if they fall into the protected classes. This
eviction preference lasts the entire life of the connection even
if the ban expires.
If they misbehave again they'll still get disconnected.
The main purpose of banning on misbehavior is to prevent our
connections from being wasted on unhelpful peers such as ones
running incompatible consensus rules. For inbound peers this
can be better accomplished with eviction preferences.
A secondary purpose was to reduce resource waste from repeated
abuse but virtually any attacker can get a nearly unlimited
supply of addresses, so disconnection is about the best we can
do.
These are separate events which need to be carried out by separate subsystems.
This also cleans up some whitespace and tabs in qt to avoid getting flagged by
the linter.
Current behavior is preserved.
fac2f5ecae Use C++11 default member initializers (MarcoFalke)
Pull request description:
The second and last change on this topic (c.f. #15109). Split up because the diff would otherwise interleave, making review harder than necessary.
This is not a stylistic change, but a change that avoids bugs such as:
* fix uninitialized read when stringifying an addrLocal #14728
* qt: Initialize members in WalletModel #12426
* net: correctly initialize nMinPingUsecTime #6636
* ...
Tree-SHA512: 547ae72b87aeaed5890eb5fdcff612bfc93354632b238d89e1e1c0487187f39609bcdc537ef21345e0aea8cfcf1ea48da432d672c5386dd87cf58742446a86b1
6dc4593db1 IsReachable is the inverse of IsLimited (DRY). Includes unit tests (marcaiaf)
Pull request description:
IsReachable is the inverse of IsLimited, but the implementation is duplicated (DRY)
- Changed the implementation accordingly.
- Added unit tests to document behavior and relationship
- My modification in net.cpp applies only to IsReachable.
- Applied clang-format-diffpy
Created new pull request to avoid the mess with:
https://github.com/bitcoin/bitcoin/pull/15044
Checked with supposedly conflicting PRs mentioned in the old PR. No conflicts with the specific changes in this PR.
Tree-SHA512: b132dec6cc2c788ebe4f63f228d78f441614e156743b17adebc990de0180a5872874d2724c86eeaa470b4521918bd137b0e33ebcaae77c5efc1f0d56104f6c87
fa2510d5c1 Use C++11 default member initializers (MarcoFalke)
Pull request description:
Changes:
* Remove unused constructors that leave some members uninitialized
* Remove manual initialization in each constructor and prefer C++11 default member initializers
This is not a stylistic change, but a change that avoids bugs such as:
* fix uninitialized read when stringifying an addrLocal #14728
* qt: Initialize members in WalletModel #12426
* net: correctly initialize nMinPingUsecTime #6636
* ...
Tree-SHA512: 0f896f3b9fcc464d5fc7525f7c86343ef9ce9fb13425fbc68e9a9728fd8710c2b4e2fd039ee08279ea41ff20fd92b7185cf5cca95a0bcb6a5340a1e6f03cae6b
4927bf2f25 Increase maxconnections limit when using poll. (Patrick Strateman)
11cc491a28 Implement poll() on systems which support it properly. (Patrick Strateman)
28211a4bc9 Move SocketEvents logic to private method. (Patrick Strateman)
7e403c0ae7 Move GenerateSelectSet logic to private method. (Patrick Strateman)
1e6afd0dbc Introduce and use constant SELECT_TIMEOUT_MILLISECONDS. (Patrick Strateman)
Pull request description:
Implement poll() on systems which support it properly.
This eliminates the restriction on maximum socket descriptor number.
Tree-SHA512: b945cd9294afdafcce96d547f67679d5cdd684cf257904a239cd1248de3b5e093b8d6d28d8d1b7cc923dc0b2b5723faef9bc9bf118a9ce1bdcf357c2323f5573
48b37db50 make peertimeout a debug argument, remove error message translation (Zain Iqbal Allarakhia)
8042bbfbf p2p: allow p2ptimeout to be configurable, speed up slow test (Zain Iqbal Allarakhia)
Pull request description:
**Summary:**
1. _Primary_: Adds a `debug_only=true` flag for peertimeout, defaults to 60 sec., the current hard-coded setting.
2. _Secondary_: Drastically speeds up `p2p_timeout.py` test.
3. _Secondary_: Tests that the correct code path is being tested by adding log assertions to the test.
**Rationale:**
- P2P timeout was hard-coded: make it explicitly specified and configurable, instead of a magic number.
- Addresses #13518; `p2p_timeout.py` takes 4 sec. to run instead of 61 sec.
- Makes `p2p_timeout.py` more explicit. Previously, we relied on a comment to inform us of the timeout amount being tested. Now it is specified directly in the test via passing in the new arg; `-peertimeout=3`.
- Opens us up to testing more P2P scenarios; oftentimes slow tests are the reason we don't test.
**Locally verified changes:**
_With Proposed Change (4.7 sec.):_
```
$ time ./test/functional/p2p_timeouts.py
2018-11-19T00:04:19.077000Z TestFramework (INFO): Initializing test directory /tmp/testhja7g2n7
2018-11-19T00:04:23.479000Z TestFramework (INFO): Stopping nodes
2018-11-19T00:04:23.683000Z TestFramework (INFO): Cleaning up /tmp/testhja7g2n7 on exit
2018-11-19T00:04:23.683000Z TestFramework (INFO): Tests successful
real 0m4.743s
```
_Currently on master (62.8 sec.):_
```
$ time ./test/functional/p2p_timeouts.py
2018-11-19T00:06:10.948000Z TestFramework (INFO): Initializing test directory /tmp/test6mo6k21h
2018-11-19T00:07:13.376000Z TestFramework (INFO): Stopping nodes
2018-11-19T00:07:13.631000Z TestFramework (INFO): Cleaning up /tmp/test6mo6k21h on exit
2018-11-19T00:07:13.631000Z TestFramework (INFO): Tests successful
real 1m2.836s
```
_Error message demonstrated for new argument `-peertimeout`:_
```
$ ./bitcoind -peertimeout=-5
...
Error: peertimeout cannot be configured with a negative value.
```
Tree-SHA512: ff7a244ebea54c4059407bf4fb86465714e6a79cef5d2bcaa22cfe831a81761aaf597ba4d5172fc2ec12266f54712216fc41b5d24849e5d9dab39ba6f09e3a2a
032488e6e7 Move SocketHandler logic to private method. (Patrick Strateman)
2af9cff11a Move InactivityCheck logic to private method. (Patrick Strateman)
7479b63d91 Move DisconnectNodes logic to private method. (Patrick Strateman)
edb5350c32 Move NotifyNumConnectionsChanged logic to private method. (Patrick Strateman)
Pull request description:
Working towards using poll() on unix like systems.
A number of small changes designed to separate the actual socket handling from the rest of the logic in ThreadSocketHandler.
This is a simpler version of #14147
Tree-SHA512: 72f35c8ef7649019dcbfe19537d8c9f7e3d0fc5854dc691a70c5573352230fc31c3f55565820c632e9b8cb3c55b878bed19e0ad9423100762197ac35967d8067
9256f7d13f build: avoid getifaddrs when unavailable (Cory Fields)
Pull request description:
These changes from @theuni help building when targeting platforms that don't always have getifaddrs available like Android < 24
Tree-SHA512: dbfeb83297bd6f00b7991f53eef8a04948d2d739bf47c0524d9ae5335b843b8a5c06ff98c109fe5e6192665e6d0cf58700b8aa7e2a0b410281d3c052881973ff
f34c8c466a Make objects in range declarations immutable by default. Avoid unnecessary copying of objects in range declarations. (practicalswift)
Pull request description:
Make objects in range declarations immutable by default.
Rationale:
* Immutable objects are easier to reason about.
* Prevents accidental or hard-to-notice change of value.
Tree-SHA512: cad69d35f0cf8a938b848e65dd537c621d96fe3369be306b65ef0cd1baf6cc0a9f28bc230e1e383d810c555a6743d08cb6b2b0bd51856d4611f537a12e5abb8b
9c4dc597dd Use LOCK macros for non-recursive locks (Russell Yanofsky)
1382913e61 Make LOCK, LOCK2, TRY_LOCK work with CWaitableCriticalSection (Russell Yanofsky)
ba1f095aad MOVEONLY Move AnnotatedMixin declaration (Russell Yanofsky)
41b88e9337 Add unit test for DEBUG_LOCKORDER code (Russell Yanofsky)
Pull request description:
Make LOCK macros work with non-recursive mutexes, and use wherever possible for better deadlock detection.
Also add unit test for DEBUG_LOCKORDER code.
Tree-SHA512: 64ef209307f28ecd0813a283f15c6406138c6ffe7f6cbbd084161044db60e2c099a7d0d2edcd1c5e7770a115e9b931b486e86c9a777bdc96d2e8a9f4dc192942
Lowering the minimum relay fee is only useful when many nodes in the
p2p network also lower the fee, so to make it easier to understand
progress on that front, this includes the value of the minfeefilter in
getpeerinfo, so you at least have visibility to what fees your neighbours
are currently accepting.
3fc20632a3 qt: Set BLOCK_CHAIN_SIZE = 220 (DrahtBot)
2b6a2f4a28 Regenerate manpages (DrahtBot)
eb7daf4d60 Update copyright headers to 2018 (DrahtBot)
Pull request description:
Some trivial maintenance to avoid having to do it again after the 0.17 branch off.
(The scripts to do this are in `./contrib/`)
Tree-SHA512: 16b2af45e0351b1c691c5311d48025dc6828079e98c2aa2e600dc5910ee8aa01858ca6c356538150dc46fe14c8819ed8ec8e4ec9a0f682b9950dd41bc50518fa
793290f940 Net: Fixed a race condition when disabling the network. (lmanners)
Pull request description:
This change addresses a race condition where setnetworkactive=false wouldn't always disconnect all peers.
Before this change, the following could happen:
1. Thread A -- Begins connecting to a node.
2. Thread B -- Sets kNetworkActive=false and disconnects connected nodes.
3. Thread A -- Finishes connecting and adds node to list of connected nodes.
The node that was connected from Thread A remains connected and active,
even though kNetworkActive=false.
To fix the race, disconnections when kNetworkActive=false are now handled in the main network loop.
fixes#13038
Tree-SHA512: 6d0b7a78ae956358e796efcc034cb532c2e0d824a52ae822a3899eefc7df76327519d1f2d77362c9fddf34ef860abd095d7490d7cc02d0ba7543bf1e8c8f2535
822a2a33a7 Modified in_addr6 cast in CConman class to work with msvc. (Aaron Clauson)
Pull request description:
Fix to allow net.cpp to compile with MSVC. Without this fix the `(in6_addr)IN6ADDR_ANY_INIT` implicit cast generates a compilation error.
Tree-SHA512: f21c5002401dc93564dcf8d49fbafe7c03ad4182df1616d2ee201e2e172f1d696ca7982fb5b42a3b7d6878c8649823044a858401b4172239fb4b0cc2a38db282
d45b344ffd Bucket for inbound when scheduling invs to hide tx time (Gleb)
Pull request description:
It has been brought up to my attention that current random delays mechanism (originally intended to obfuscate transaction metadata) allows to easily estimate the time a transaction was received by a node.
It may be done by connecting multiple observer nodes to the same node. Each of those nodes will generate its own schedule of delays. Combined metadata regarding those events from different sources allows an observer to estimate transaction time.
After this patch a spy won't gain additional information by just creating multiple connections to a target.
Tree-SHA512: c71dae5ff350b614cb40a8e201fd0562d3e03e3e72a5099718cd451f0d84c66d5e52bbaf0d5b4b75137514c8efdedcc6ef4df90142b360153f04ad0721545ab1
253f592909 Add stdin, stdout, stderr to ignored export list (Chun Kuan Lee)
fc6a9f2ab1 Use IN6ADDR_ANY_INIT instead of in6addr_any (Cory Fields)
908c1d7745 GCC-7 and glibc-2.27 compat code (Chun Kuan Lee)
Pull request description:
The `__divmoddi4` code was modified from https://github.com/gcc-mirror/gcc/blob/master/libgcc/libgcc2.c . I manually find the older glibc version of log2f by objdump, use `.symver` to specify the certain version.
Tree-SHA512: e8d875652003618c73e019ccc420e7a25d46f4eaff1c7a1a6bfc1770b3b46f074b368b2cb14df541b5ab124cca41dede4e28fe863a670589b834ef6b8713f9c4
This change addresses a race condition where setnetworkactive=false wouldn't always disconnect all peers.
Before this change, the following could happen:
1. Thread A -- Begins connecting to a node.
2. Thread B -- Sets kNetworkActive=false and disconnects connected nodes.
3. Thread A -- Finishes connecting and adds node to list of connected nodes.
The node that was connected from Thread A remains connected and active,
even though kNetworkActive=false.
To fix the race, disconnections when kNetworkActive=false are now handled in the main network loop.
fixes#13038
a5bca13 Bugfix: Include <memory> for std::unique_ptr (Luke Dashjr)
Pull request description:
Not sure why all these includes were missing, but it's breaking builds for some users:
https://bugs.gentoo.org/show_bug.cgi?id=652142
(Added to all files with a reference to `std::unique_ptr`)
Tree-SHA512: 8a2c67513ca07b9bb52c34e8a20b15e56f8af2530310d9ee9b0a69694dd05e02e7a3683f14101a2685d457672b56addec591a0bb83900a0eb8e2a43d43200509
4d9b4256d8 Fix typos (Dimitris Apostolou)
Pull request description:
Unfortunately I messed up my repo while trying to squash #12593 so I created a PR with just the correct fixes.
Tree-SHA512: 295d77b51bd2a9381f1802c263de7ffb2edd670d9647391e32f9a414705b3c8b483bb0e469a9b85ab6a70919ea13397fa8dfda2aea7a398b64b187f178fe6a06
It is redundant to check for the presence of MSG_NOSIGNAL macro in
configure.ac, define HAVE_MSG_NOSIGNAL and then check whether the later
is defined in the source code. Instead we can check directly whether
MSG_NOSIGNAL is defined. Same for MSG_DONTWAIT.
In addition to that, the checks we had in configure.ac produce a
compiler warning about unused variable and thus could fail if
-Werror is present and erroneously proclaim that the macros are
not available.
* Z is the zone designator for the zero UTC offset.
* T is the delimiter used to separate date and time.
This makes it clear for the end-user that the date/time logged is
specified in UTC and not in the local time zone.
A risk exists where a malicious DNS seeder eclipses a node by returning an enormous number of IP addresses. In this commit we mitigate this risk by limiting the number of IP addresses addrman learns to 256 per DNS seeder.
e68172ed9 Add test-before-evict discipline to addrman (Ethan Heilman)
Pull request description:
This change implement countermeasures 3 (test-before-evict) suggested in our paper: ["Eclipse Attacks on Bitcoin’s Peer-to-Peer Network"](http://cs-people.bu.edu/heilman/eclipse/).
# Design:
A collision occurs when an address, addr1, is being moved to the tried table from the new table, but maps to a position in the tried table which already contains an address (addr2). The current behavior is that addr1 would evict addr2 from the tried table.
This change ensures that during a collision, addr1 is not inserted into tried but instead inserted into a buffer (setTriedCollisions). The to-be-evicted address, addr2, is then tested by [a feeler connection](https://github.com/bitcoin/bitcoin/pull/8282). If addr2 is found to be online, we remove addr1 from the buffer and addr2 is not evicted, on the other hand if addr2 is found be offline it is replaced by addr1.
An additional small advantage of this change is that, as no more than ten addresses can be in the test buffer at once, and addresses are only cleared one at a time from the test buffer (at 2 minute intervals), thus an attacker is forced to wait at least two minutes to insert a new address into tried after filling up the test buffer. This rate limits an attacker attempting to launch an eclipse attack.
# Risk mitigation:
- To prevent this functionality from being used as a DoS vector, we limit the number of addresses which are to be tested to ten. If we have more than ten addresses to test, we drop new addresses being added to tried if they would evict an address. Since the feeler thread only creates one new connection every 2 minutes the additional network overhead is limited.
- An address in tried gains immunity from tests for 4 hours after it has been tested or successfully connected to.
# Tests:
This change includes additional addrman unittests which test this behavior.
I ran an instance of this change with a much smaller tried table (2 buckets of 64 addresses) so that collisions were much more likely and observed evictions.
```
2016-10-27 07:20:26 Swapping 208.12.64.252:8333 for 68.62.95.247:8333 in tried table
2016-10-27 07:20:26 Moving 208.12.64.252:8333 to tried
```
I documented tests we ran against similar earlier versions of this change in #6355.
# Security Benefit
This is was originally posted in PR #8282 see [this comment for full details](https://github.com/bitcoin/bitcoin/pull/8282#issuecomment-237255215).
To determine the security benefit of these larger numbers of IPs in the tried table I modeled the attack presented in [Eclipse Attacks on Bitcoin’s Peer-to-Peer Network](https://eprint.iacr.org/2015/263).
**Default node:** 595 attacker IPs for ~50% attack success.
**Default node + test-before-evict:** 620 attacker IPs for ~50% attack success.
**Feeler node:** 5540 attacker IPs for ~50% attack success.
**Feeler node + test-before-evict:** 8600 attacker IPs for ~50% attack success.
The node running feeler connections has 10 times as many online IP addresses in its tried table making an attack 10 times harder (i.e. requiring the an attacker require 10 times as many IP addresses in different /16s). Adding test-before-evict increases resistance of the node by an additional 3000 attacker IP addresses.
Below I graph the attack over even greater attacker resources (i.e. more attacker controled IP addresses). Note that test-before-evict maintains some security far longer even against an attacker with 50,000 IPs. If this node had a larger tried table test-before-evict could greatly boost a nodes resistance to eclipse attacks.
Tree-SHA512: fdad4d26aadeaad9bcdc71929b3eb4e1f855b3ee3541fbfbe25dca8d7d0a1667815402db0cb4319db6bd3fcd32d67b5bbc0e12045c4252d62d6239b7d77c4395
Changes addrman to use the test-before-evict discipline in which an
address is to be evicted from the tried table is first tested and if
it is still online it is not evicted.
Adds tests to provide test coverage for this change.
This change was suggested as Countermeasure 3 in
Eclipse Attacks on Bitcoin’s Peer-to-Peer Network, Ethan Heilman,
Alison Kendler, Aviv Zohar, Sharon Goldberg. ePrint Archive Report
2015/263. March 2015.
eb91835 Add setter for g_initial_block_download_completed (Jonas Schnelli)
3f56df5 [QA] add NODE_NETWORK_LIMITED address relay and sync test (Jonas Schnelli)
158e1a6 [QA] fix mininode CAddress ser/deser (Jonas Schnelli)
fa999af [QA] Allow addrman loopback tests (add debug option -addrmantest) (Jonas Schnelli)
6fe57bd Connect to peers signaling NODE_NETWORK_LIMITED when out-of-IBD (Jonas Schnelli)
31c45a9 Accept addresses with NODE_NETWORK_LIMITED flag (Jonas Schnelli)
Pull request description:
Eventually connect to peers signalling NODE_NETWORK_LIMITED if we are out of IBD.
Accept and relay NODE_NETWORK_LIMITED peers in addrman.
Tree-SHA512: 8a238fc97f767f81cae1866d6cc061390f23a72af4a711d2f7158c77f876017986abb371d213d1c84019eef7be4ca951e8e6f83fda36769c4e1a1d763f787037
9ad6746ccd Use static_cast instead of C-style casts for non-fundamental types (practicalswift)
Pull request description:
A C-style cast is equivalent to try casting in the following order:
1. `const_cast(...)`
2. `static_cast(...)`
3. `const_cast(static_cast(...))`
4. `reinterpret_cast(...)`
5. `const_cast(reinterpret_cast(...))`
By using `static_cast<T>(...)` explicitly we avoid the possibility of an unintentional and dangerous `reinterpret_cast`. Furthermore `static_cast<T>(...)` allows for easier grepping of casts.
For a more thorough discussion, see ["ES.49: If you must use a cast, use a named cast"](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#es49-if-you-must-use-a-cast-use-a-named-cast) in the C++ Core Guidelines (Stroustrup & Sutter).
Tree-SHA512: bd6349b7ea157da93a47b8cf238932af5dff84731374ccfd69b9f732fabdad1f9b1cdfca67497040f14eaa85346391404f4c0495e22c467f26ca883cd2de4d3c
2b839ab Update chainparams comment for more info on service bits per dnsseed (Matt Corallo)
62e7642 Fall back to oneshot for DNS Seeds which don't support filtering. (Matt Corallo)
51ae766 Use GetDesireableServiceFlags in static seeds, document this. (Matt Corallo)
fb6f6b1 bluematt's testnet-seed now supports x9 (and is just a static list) (Matt Corallo)
Pull request description:
4440710 broke inserting entries into addrman from dnsseeds which
did not support service bits, as well as static seeds. Static seeds
were already being filtered by UA for 0.13.1+ (ie NODE_WITNESS), so
simply changing the default service bits to include NODE_WITNESS
(and updating docs appropriately) is sufficient. For DNS Seeds, not
supporting NODE_WITNESS is no longer useful, so instead use
non-filtering seeds as oneshot hosts irrespective of named proxy.
I've set my testnet-seed to also support x9, though because it is simply a static host, it may be useful to leave the support off so that it is used as a oneshot to get addresses from a live node instead. I'm fine with either.
Tree-SHA512: 3f17d4d2b0b84d876981c962d2b44cb0c8f95f52c56a48c6b35fd882f6d7a40805f320ec452985a1c0b34aebddb1922709156c3ceccd1b9f8363fd7cb537d21d
This allows us to not have to update the chainparams whenever a
DNS Seed changes its filtering support, as well fixes a bug
introduced in 44407100f where returned nodes will never be
attempted.
44407100f broke inserting entries into addrman from static seeds
(as well as dnsseeds which did not support service bits). Static
seeds were already being filtered by UA for 0.13.1+ (ie
NODE_WITNESS), so simply changing the default service bits to
include NODE_WITNESS (and updating docs appropriately) is
sufficient.
For DNS Seeds, we will later fix by falling back to oneshot if a
seed does not support filtering.
57ac471 Call BannedListChanged outside of cs_setBanned lock (Jonas Schnelli)
c853812 Update ban-state in case of dirty-state during periodic sweep (Jonas Schnelli)
Pull request description:
We do currently not update the UI during periodic ban list sweeps (via dump banlist).
Fixes#11612
Tree-SHA512: bffbdcc03c63042177bdd511b0a9187c211c2b5011178481e8ee3e43a71eef1e4cd6b72f73672babab142b644f62f8b56f0aac1d26d3f19372b1f8644fec9395
3830b6e net: use CreateSocket for binds (Cory Fields)
df3bcf8 net: pass socket closing responsibility up to caller for outgoing connections (Cory Fields)
9e3b2f5 net: Move IsSelectableSocket check into socket creation (Cory Fields)
1729c29 net: split socket creation out of connection (Cory Fields)
Pull request description:
Requirement for #11227.
We'll need to create sockets and perform the actual connect in separate steps, so break them up.
#11227 adds an RAII wrapper around connection attempts, as a belt-and-suspenders in case a CloseSocket is missed.
Tree-SHA512: de675bb718cc56d68893c303b8057ca062c7431eaa17ae7c4829caed119fa3f15b404d8f52aca22a6bca6e73a26fb79e898b335d090ab015bf6456cf417fc694
We use select in ConnectSocketDirectly, so this check needs to happen before
that.
IsSelectableSocket will not be relevant after upcoming changes to remove select.
a720b92 Remove includes in .cpp files for things the corresponding .h file already included (practicalswift)
Pull request description:
Remove includes in .cpp files for things the corresponding .h file already included.
Example case:
* `addrdb.cpp` includes `addrdb.h` and `fs.h`
* `addrdb.h` includes `fs.h`
Then remove the direct inclusion of `fs.h` in `addrman.cpp` and rely on the indirect inclusion of `fs.h` via the included `addrdb.h`.
In line with the header include guideline (see #10575).
Tree-SHA512: 8704b9de3011a4c234db336a39f7d2c139e741cf0f7aef08a5d3e05197e1e18286b863fdab25ae9638af4ff86b3d52e5cab9eed66bfa2476063aa5c79f9b0346
be9f38c Do not make it trivial for inbound peers to generate log entries (Matt Corallo)
Pull request description:
Based on #11580 because I'm lazy.
We should generally avoid writing to debug.log unconditionally for
inbound peers which misbehave (the peer being about to be banned
being an exception, since they cannot do this twice).
Tree-SHA512: 8e59c8d08d00b1527951b30f4842d010a4c2fc440503ade112baa2c1b9afd0e0d1c5c2df83dde25183a242af45089cf9b9f873b71796771232ffb6c5fc6cc0cc
680bc2cbb Use range-based for loops (C++11) when looping over map elements (practicalswift)
Pull request description:
Before this commit:
```c++
for (std::map<T1, T2>::iterator x = y.begin(); x != y.end(); ++x) {
T1 z = (*x).first;
…
}
```
After this commit:
```c++
for (auto& x : y) {
T1 z = x.first;
…
}
```
Tree-SHA512: 954b136b7f5e6df09f39248a6b530fd9baa9ab59d7c2c7eb369fd4afbb591b7a52c92ee25f87f1745f47b41d6828b7abfd395b43daf84a55b4e6a3d45015e3a0
We should generally avoid writing to debug.log unconditionally for
inbound peers which misbehave (the peer being about to be banned
being an exception, since they cannot do this twice).
To avoid removing logs for outbound peers, a new log is added to
notify users when a new outbound peer is connected which mimics
the version print.
b109a1c Remove redundant nullptr checks before deallocation (practicalswift)
Pull request description:
Rationale:
* `delete ptr` is a no-op if `ptr` is `nullptr`
Tree-SHA512: c98ce769125c4912186a8403cc08a59cfba85b7141af645c709b4c4eb90dd9cbdd6ed8076d50099d1e4ec2bf75917d1af6844082ec42bbb4d94d229a710e051c
5ce7cb9 [net] De-duplicate connection eviction logic (Thomas Snider)
Pull request description:
While reviewing the safeguards against deliberate node isolation on the network by malicious actors, I found a good de-duplication candidate.
I think this form is much more legible (the type of `cutoffs` notwithstanding). ReverseCompareNodeTimeConnected is not included in the list since the cutoff size is a function of the remaining number of nodes in the candidate eviction set.
Tree-SHA512: ed17999fa9250dcf8448329219324477117e4ecd2d41dedd72ad253e44630eef50b3232c420f1862ebbfb9b8c94efbba1a235b519e39ff5946865c7d69a75280
If our tip hasn't updated in a while, that may be because our peers are
not relaying blocks to us that we would consider valid. Allow connection
to an additional outbound peer in that circumstance.
Also, periodically check to see if we are exceeding our target number of
outbound peers, and disconnect the one which has least recently
announced a new block to us (choosing the newest such peer in the case
of tie).
Adds HasAllRelevantServices and GetRelevantServices, which check
for NETWORK|WITNESS.
This changes the following:
* Removes nRelevantServices from CConnman, disconnecting it a bit
more from protocol-level logic.
* Replaces our sometimes-connect-to-!WITNESS-nodes logic with
simply always requiring WITNESS|NETWORK for outbound non-feeler
connections (feelers still only require NETWORK).
* This has the added benefit of removing nServicesExpected from
CNode - instead letting net_processing's VERSION message
handling simply check HasAllRelevantServices.
* This implies we believe WITNESS nodes to continue to be a
significant majority of nodes on the network, but also because
we cannot sync properly from !WITNESS nodes, it is strange to
continue using our valuable outbound slots on them.
* In order to prevent this change from preventing connection to
-connect= nodes which have !WITNESS, -connect nodes are now
given the "addnode" flag. This also allows outbound connections
to !NODE_NETWORK nodes for -connect nodes (which was already true
of addnodes).
* Has the (somewhat unintended) consequence of changing one of the
eviction metrics from the same
sometimes-connect-to-!WITNESS-nodes metric to requiring
HasRelevantServices.
This should make NODE_NETWORK_LIMITED much simpler to implement.
b887676 net: remove now-unused functions (Cory Fields)
45fd754 net: remove now-superfluous numeric resolve (Cory Fields)
2416dd7 net: separate resolving and conecting (Cory Fields)
Pull request description:
This is a greatly simplified version of #10285, which only aims to address async resolving.
It essentially breaks up two wrapper functions for things only used in one place (ConnectSocketDirectly/ConnectThroughProxy) in favor of calling them directly. This allows us to fully handle resolves before attempting a connection, as is necessary for async connections.
As a bonus, I believe the logic is now much easier to follow than before.
Tree-SHA512: f03f618107379edf3efe2a9f3e3677e8f075017ab140a0b4fdc3b8263e6beff148d55256263ab10bc2125ef089ca68e0d8e865beeae176f1eca544e769c976d3
A C-style cast is equivalent to try casting in the following order:
1. const_cast(...)
2. static_cast(...)
3. const_cast(static_cast(...))
4. reinterpret_cast(...)
5. const_cast(reinterpret_cast(...))
By using static_cast<T>(...) explicitly we avoid the possibility
of an unintentional and dangerous reinterpret_cast. Furthermore
static_cast<T>(...) allows for easier grepping of casts.
This was added in order to help OpenNetworkConnection avoid creating a
connection that it would end up aborting. It was necessary because resolving
was done as part of the connection process.
Now that resolving is separated from connecting, this case is detected before
the connection is attempted.
ConnectSocketByName handled resolves as necessary, obscuring the connection
process. With them separated, each can be handled asynchronously.
Also, since proxies must be considered now anyway, go ahead and eliminate the
ConnectSocket wrapper and use ConnectSocketDirectly... directly.
There are a few too many edge-cases here to make this a scripted diff.
The following commits will move a few functions into PeerLogicValidation, where
the local connman instance can be used. This change prepares for that usage.
352d582ba Add vConnect to CConnman::Options (Marko Bencun)
Pull request description:
Split the "-connect" argument parsing out of CConnman and put it into
AppInitMain().
Tree-SHA512: f2d3efc4e2c5808ff98696ea20dd96df599bc472ed5afc9c3eea305d94c36a6ab50c632aa05396c7c34d1917d91b1e7ccd725656ff2631e2a36d9eac477455dc
When running test_bitcoin under Valgrind I found the following issue:
```
$ valgrind src/test/test_bitcoin
...
==10465== Use of uninitialised value of size 8
==10465== at 0x6D09B61: ??? (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21)
==10465== by 0x6D0B1BB: std::ostreambuf_iterator<char, std::char_traits<char> > std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > >::_M_insert_int<unsigned long>(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, unsigned long) const (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21)
==10465== by 0x6D0B36C: std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > >::do_put(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, unsigned long) const (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21)
==10465== by 0x6D17699: std::ostream& std::ostream::_M_insert<unsigned long>(unsigned long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21)
==10465== by 0x4CAAD7: operator<< (ostream:171)
==10465== by 0x4CAAD7: formatValue<ServiceFlags> (tinyformat.h:345)
==10465== by 0x4CAAD7: void tinyformat::detail::FormatArg::formatImpl<ServiceFlags>(std::ostream&, char const*, char const*, int, void const*) (tinyformat.h:523)
==10465== by 0x1924D4: format (tinyformat.h:510)
==10465== by 0x1924D4: tinyformat::detail::formatImpl(std::ostream&, char const*, tinyformat::detail::FormatArg const*, int) (tinyformat.h:803)
==10465== by 0x553A55: vformat (tinyformat.h:947)
==10465== by 0x553A55: format<ServiceFlags> (tinyformat.h:957)
==10465== by 0x553A55: std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > tinyformat::format<ServiceFlags>(char const*, ServiceFlags const&) (tinyformat.h:966)
==10465== by 0x54C952: getnetworkinfo(JSONRPCRequest const&) (net.cpp:462)
==10465== by 0x28EDB5: CallRPC(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >) (rpc_tests.cpp:31)
==10465== by 0x293947: rpc_tests::rpc_togglenetwork::test_method() (rpc_tests.cpp:88)
==10465== by 0x2950E5: rpc_tests::rpc_togglenetwork_invoker() (rpc_tests.cpp:84)
==10465== by 0x182496: invoke<void (*)()> (callback.hpp:56)
==10465== by 0x182496: boost::unit_test::ut_detail::callback0_impl_t<boost::unit_test::ut_detail::unused, void (*)()>::invoke() (callback.hpp:89)
...
```
The read of the uninitialized variable nLocalServices is triggered by g_connman->GetLocalServices()
in getnetworkinfo(const JSONRPCRequest& request) (net.cpp:462):
```c++
UniValue getnetworkinfo(const JSONRPCRequest& request)
{
...
if(g_connman)
obj.push_back(Pair("localservices", strprintf("%016x", g_connman->GetLocalServices())));
...
}
```
The reason for the uninitialized nLocalServices is that CConnman::Start(...) is not called
by the tests, and hence the initialization normally performed by CConnman::Start(...) is
not done.
This commit adds a method Init(const Options& connOptions) which is called by both the
constructor and CConnman::Start(...). This method initializes nLocalServices and the other
relevant values from the supplied Options object.
f228b8e remove some unused functions (Marko Bencun)
Pull request description:
Identified with `cppcheck --enable=unusedFunction .`.
- GetSendBufferSize()'s last use removed in
991955e
- SetPort()'s last use removed in
7e195e8
- GetfLargeWorkInvalidChainFound() was introduced in
e3ba0ef and never used
Tree-SHA512: ea8e5498bec981e42e1342c171c37723c2f5e575c7d6c1a524d9c6cd9b332bdd0d84fddf9e14ca011bb49fb82bd037386382c9afc546b3c2231ae548358bd4f4
a2420ae Avoid unnecessary work in SetNetworkActive (João Barbosa)
Pull request description:
This PR adds an early return to avoid unnecessary notifications when the status doesn't change.
Tree-SHA512: 85d05ca6fa36cb581f94bc154d08bd72cd53f6a857173c6fb2f184058f9c0208c4cf5e5d196825a78339902d8f256688eb6793f99abc7be9c7cfac85136180d9
Identified with `cppcheck --enable=unusedFunction .`.
- GetSendBufferSize()'s last use removed in
991955ee81
- SetPort()'s last use removed in
7e195e8459
- GetfLargeWorkInvalidChainFound() was introduced in
e3ba0ef956 and never used
c1be285 chainparams: make supported service bits option explicit (Cory Fields)
d5c7c1c net: use an internal address for fixed seeds (Cory Fields)
6cdc488 net: switch to dummy internal ip for dns seed source (Cory Fields)
6d0bd5b net: do not allow resolving to an internal address (Cory Fields)
7f31762 net: add an internal subnet for representing unresolved hostnames (Cory Fields)
Tree-SHA512: 9bf1042bef546ac3ef0e0d3a9a5555eb21628ff2674a0cf8c6367194b22bfdab477adf452c0e7c56f44e0fb37debc5e14bdb623452e076fb9c492c7702601d7a
Part of a series of changes to clean up the instantiation of connman
by decoupling the command line arguments.
We also now abort with an error when explicit binds are set with
-listen=0.
We currently do two resolves for dns seeds: one for the results, and one to
serve in addrman as the source for those addresses.
There's no requirement that the source hostname resolves to the stored
identifier, only that the mapping is unique. So rather than incurring the
second lookup, combine a private subnet with a hash of the hostname.
The resulting v6 ip is guaranteed not to be publicy routable, and has only a
negligible chance of colliding with a user's internal network (which would be
of no consequence anyway).
This adds the listening address on which incoming connections were received to the
CNode and CNodeStats structures.
The address is reported in `getpeerinfo`.
This can be useful for distinguishing connections received on different listening ports
(e.g. when using a different listening port for Tor hidden service connections)
or different networks.
b6fbfc2 net: only enforce the services required to connect (Cory Fields)
Tree-SHA512: 88943bff63213a734f3c96c45760cadaeb9ba18287c8a20c279851ebaf058a334c969028fb2180f155508e3eea4b838147382e4f2b655e7a9aa098eadc81d53e
