Introduce two new options to reach the I2P network:
* `-i2psam=<ip:port>` point to the I2P SAM proxy. If this is set then
the I2P network is considered reachable and we can make outgoing
connections to I2P peers via that proxy. We listen for and accept
incoming connections from I2P peers if the below is set in addition to
`-i2psam=<ip:port>`
* `-i2pacceptincoming` if this is set together with `-i2psam=<ip:port>`
then we accept incoming I2P connections via the I2P SAM proxy.
Our local (bind) address is already saved in `CNode::addrBind` and there
is no need to re-retrieve it again with `GetBindAddress()`.
Also, for I2P connections `CNode::addrBind` would contain our I2P
address, but `GetBindAddress()` would return something like
`127.0.0.1:RANDOM_PORT`.
Isolate the second half of `CConnman::AcceptConnection()` into a new
separate method, which could be reused if we accept incoming connections
by other means than `accept()` (first half of
`CConnman::AcceptConnection()`).
Call `GetBindAddress()` earlier in `CConnman::AcceptConnection()`. That
is specific to the TCP protocol and makes the code below it reusable for
other protocols, if the caller provides `addr_bind`, retrieved by other
means.
This check is related to an `accept()` failure. So do the check earlier,
closer to the `accept()` call.
This will allow to isolate the `accept()`-specific code at the beginning
of `CConnman::AcceptConnection()` and reuse the code that follows it.
faf48f20f1 log: Clarify log message when file does not exist (MarcoFalke)
Pull request description:
Shorter and broader alternative to #21181
Rendered diff:
```diff
@@ -1,4 +1,4 @@
-Bitcoin Core version v21.99.0-db656db2ed5a (release build)
+Bitcoin Core version v21.99.0-faf48f20f196 (release build)
Qt 5.15.2 (dynamic), plugin=wayland (dynamic)
No static plugins.
Style: adwaita / Adwaita::Style
@@ -24,8 +24,8 @@ scheduler thread start
Using wallet directory /tmp/test_001/regtest/wallets
init message: Verifying wallet(s)...
init message: Loading banlist...
-ERROR: DeserializeFileDB: Failed to open file /tmp/test_001/regtest/banlist.dat
-Invalid or missing banlist.dat; recreating
+Missing or invalid file /tmp/test_001/regtest/banlist.dat
+Recreating banlist.dat
SetNetworkActive: true
Failed to read fee estimates from /tmp/test_001/regtest/fee_estimates.dat. Continue anyway.
Using /16 prefix for IP bucketing
@@ -63,9 +63,9 @@ Bound to [::]:18444
Bound to 0.0.0.0:18444
Bound to 127.0.0.1:18445
init message: Loading P2P addresses...
-ERROR: DeserializeFileDB: Failed to open file /tmp/test_001/regtest/peers.dat
-Invalid or missing peers.dat; recreating
-ERROR: DeserializeFileDB: Failed to open file /tmp/test_001/regtest/anchors.dat
+Missing or invalid file /tmp/test_001/regtest/peers.dat
+Recreating peers.dat
+Missing or invalid file /tmp/test_001/regtest/anchors.dat
0 block-relay-only anchors will be tried for connections.
init message: Starting network threads...
net thread start
ACKs for top commit:
jnewbery:
utACK faf48f20f1
amitiuttarwar:
utACK faf48f20f1, 👍 for consistency. also checked where we create / load other `.dat` files, looks good to me.
practicalswift:
cr ACK faf48f20f1
Tree-SHA512: 697a728ef2b9f203363ac00b03eaf23ddf80bee043ecd3719265a0d884e8cfe88cd39afe946c86ab849edd1c836f05ec51125f052bdc14fe184b84447567756f
GetLocalAddrForPeer() is only called in one place. The checks inside that
function make more sense to be carried out be the caller:
- fSuccessfullyConnected is already checked at the top of
SendMessages(), so must be true when we call GetLocalAddrForPeer()
- fListen can go into the conditional before GetLocalAddrForPeer() is
called.
Gossiping addresses to peers is the responsibility of net processing.
Change AdvertiseLocal() in net to just return an (optional) address
for net processing to advertise. Update function name to reflect
new responsibility.
Moves the logic to prevent running inactivity checks until
the peer has been connected for -peertimeout time into its
own function. This will be reused by net_processing later.
fe3e993968 [p2p] No delay in adding fixed seeds if -dnsseed=0 and peers.dat is empty. Add -fixedseeds arg. (Dhruv Mehta)
Pull request description:
Closes#19795
Before PR: If `peers.dat` is empty and `-dnsseed=0`, bitcoind will fallback on to fixed seeds but only after a 60 seconds delay.
After PR: There's no 60 second delay.
To reproduce:
`rm ~/.bitcoin/peers.dat && src/bitcoind -dnsseed=0` without and with patch code
Other changes in the PR:
- `-fixedseeds` command line argument added: `-dnsseed=0 -fixedseeds=0 -addnode=X` provides a trusted peer only setup. `-dnsseed=0 -fixedseeds=0` allows for a `addnode` RPC to add a trusted peer without falling back to hardcoded seeds.
ACKs for top commit:
LarryRuane:
re-ACK fe3e993968
laanwj:
re-ACK fe3e993968
Tree-SHA512: 79449bf4e83a315be6dbac9bdd226de89d2a3f7f76d9c5640a2cb3572866e6b0e8ed67e65674c9824054cf13119dc01c7e1a33848daac6b6c34dbc158b6dba8f
615ba0eb96 test: add Sock unit tests (Vasil Dimov)
7bd21ce1ef style: rename hSocket to sock (Vasil Dimov)
04ae846904 net: use Sock in InterruptibleRecv() and Socks5() (Vasil Dimov)
ba9d73268f net: add RAII socket and use it instead of bare SOCKET (Vasil Dimov)
dec9b5e850 net: move CloseSocket() from netbase to util/sock (Vasil Dimov)
aa17a44551 net: move MillisToTimeval() from netbase to util/time (Vasil Dimov)
Pull request description:
Introduce a class to manage the lifetime of a socket - when the object
that contains the socket goes out of scope, the underlying socket will
be closed.
In addition, the new `Sock` class has a `Send()`, `Recv()` and `Wait()`
methods that can be overridden by unit tests to mock the socket
operations.
The `Wait()` method also hides the
`#ifdef USE_POLL poll() #else select() #endif` technique from higher
level code.
ACKs for top commit:
laanwj:
Re-ACK 615ba0eb96
jonatack:
re-ACK 615ba0eb96
Tree-SHA512: 3003e6bc0259295ca0265ccdeb1522ee25b4abe66d32e6ceaa51b55e0a999df7ddee765f86ce558a788c1953ee2009bfa149b09d494593f7d799c0d7d930bee8
Use the `Sock` class instead of `SOCKET` for `InterruptibleRecv()` and
`Socks5()`.
This way the `Socks5()` function can be tested by giving it a mocked
instance of a socket.
Co-authored-by: practicalswift <practicalswift@users.noreply.github.com>
Introduce a class to manage the lifetime of a socket - when the object
that contains the socket goes out of scope, the underlying socket will
be closed.
In addition, the new `Sock` class has a `Send()`, `Recv()` and `Wait()`
methods that can be overridden by unit tests to mock the socket
operations.
The `Wait()` method also hides the
`#ifdef USE_POLL poll() #else select() #endif` technique from higher
level code.
Move `CloseSocket()` (and `NetworkErrorString()` which it uses) from
`netbase.{h,cpp}` to newly added `src/util/sock.{h,cpp}`.
This is necessary in order to use `CloseSocket()` from a newly
introduced Sock class (which will live in `src/util/sock.{h,cpp}`).
`sock.{h,cpp}` cannot depend on netbase because netbase will depend
on it.
bff7c66e67 Add documentation to contrib folder (Troy Giorshev)
381f77be85 Add Message Capture Test (Troy Giorshev)
e4f378a505 Add capture parser (Troy Giorshev)
4d1a582549 Call CaptureMessage at appropriate locations (Troy Giorshev)
f2a77ff97b Add CaptureMessage (Troy Giorshev)
dbf779d5de Clean PushMessage and ProcessMessages (Troy Giorshev)
Pull request description:
This PR introduces per-peer message capture into Bitcoin Core. 📓
## Purpose
The purpose and scope of this feature is intentionally limited. It answers a question anyone new to Bitcoin's P2P protocol has had: "Can I see what messages my node is sending and receiving?".
## Functionality
When a new debug-only command line argument `capturemessages` is set, any message that the node receives or sends is captured. The capture occurs in the MessageHandler thread. When receiving a message, it is captured as soon as the MessageHandler thread takes the message off of the vProcessMsg queue. When sending, the message is captured just before the message is pushed onto the vSendMsg queue.
The message capture is as minimal as possible to reduce the performance impact on the node. Messages are captured to a new `message_capture` folder in the datadir. Each node has their own subfolder named with their IP address and port. Inside, received and sent messages are captured into two binary files, msgs_recv.dat and msgs_sent.dat, like so:
```
message_capture/203.0.113.7:56072/msgs_recv.dat
message_capture/203.0.113.7:56072/msgs_sent.dat
```
Because the messages are raw binary dumps, included in this PR is a Python parsing tool to convert the binary files into human-readable JSON. This script has been placed on its own and out of the way in the new `contrib/message-capture` folder. Its usage is simple and easily discovered by the autogenerated `-h` option.
## Future Maintenance
I sympathize greatly with anyone who says "the best code is no code".
The future maintenance of this feature will be minimal. The logic to deserialize the payload of the p2p messages exists in our testing framework. As long as our testing framework works, so will this tool.
Additionally, I hope that the simplicity of this tool will mean that it gets used frequently, so that problems will be discovered and solved when they are small.
## FAQ
"Why not just use Wireshark"
Yes, Wireshark has the ability to filter and decode Bitcoin messages. However, the purpose of the message capture added in this PR is to assist with debugging, primarily for new developers looking to improve their knowledge of the Bitcoin Protocol. This drives the design in a different direction than Wireshark, in two different ways. First, this tool must be convenient and simple to use. Using an external tool, like Wireshark, requires setup and interpretation of the results. To a new user who doesn't necessarily know what to expect, this is unnecessary difficulty. This tool, on the other hand, "just works". Turn on the command line flag, run your node, run the script, read the JSON. Second, because this tool is being used for debugging, we want it to be as close to the true behavior of the node as possible. A lot can happen in the SocketHandler thread that would be missed by Wireshark.
Additionally, if we are to use Wireshark, we are at the mercy of whoever it maintaining the protocol in Wireshark, both as to it being accurate and recent. As can be seen by the **many** previous attempts to include Bitcoin in Wireshark (google "bitcoin dissector") this is easier said than done.
Lastly, I truly believe that this tool will be used significantly more by being included in the codebase. It's just that much more discoverable.
ACKs for top commit:
MarcoFalke:
re-ACK bff7c66e67 only some minor changes: 👚
jnewbery:
utACK bff7c66e67
theStack:
re-ACK bff7c66e67
Tree-SHA512: e59e3160422269221f70f98720b47842775781c247c064071d546c24fa7a35a0e5534e8baa4b4591a750d7eb16de6b4ecf54cbee6d193b261f4f104e28c15f47
2a39ccf133 Add include for std::bind. (sinetek)
Pull request description:
Hi, this patch adds in <functional> because the GUI code makes use of std::bind.
That's all.
ACKs for top commit:
jonasschnelli:
utACK 2a39ccf133
Tree-SHA512: fb5ac07d9cd5d006182b52857b289a9926362a2f1bfa4f7f1c78a088670e2ccf39ca28214781df82e8de3909fa3e69685fe1124a7e3ead758575839f5f2277a9
This commit adds the CaptureMessage function. This will later be called
when any message is sent or received. The capture directory is fixed,
in a new folder "message_capture" in the datadir. Peers will then have
their own subfolders, named with their IP address and port, replacing
colons with underscores to keep compatibility with Windows. Inside,
received and sent messages will be captured into two binary files,
msgs_recv.dat and msgs_sent.dat.
e.g.
message_capture/203.0.113.7_56072/msgs_recv.dat
message_capture/203.0.113.7_56072/msgs_sent.dat
The format has been designed as to result in a minimal performance
impact. A parsing script is added in a later commit.
Also clean up and better comment the function. InactivityChecks() uses a
mixture of (non-mockable) system time and mockable time. Make sure
that's well documented.
Despite being marked as const in CConnman before this commit, the
function did mutate the state of the passed in CNode, which is contained
in vNodes, which is a member of CConnman. To make the function truly
const in CConnman and all its data, instead make InactivityChecks() a
pure function, return whether the peer should be disconnected, and let
the calling function (SocketHandler()) update the CNode object. Also
make the CNode& argument const.
This brings PushMessage and ProcessMessages further in line with the
style guide by fixing their if statements.
LogMessage is later called, inside an if statement, inside both of these
methods.
b4dd2ef800 [test] Test the add_outbound_p2p_connection functionality (Amiti Uttarwar)
602e69e427 [test] P2PBlocksOnly - Test block-relay-only connections. (Amiti Uttarwar)
8bb6beacb1 [test/refactor] P2PBlocksOnly - Extract transaction violation test into helper. (Amiti Uttarwar)
99791e7560 [test/refactor] P2PBlocksOnly - simplify transaction creation using blocktool helper. (Amiti Uttarwar)
3997ab9154 [test] Add test framework support to create outbound connections. (Amiti Uttarwar)
5bc04e8837 [rpc/net] Introduce addconnection to test outbounds & blockrelay (Amiti Uttarwar)
Pull request description:
The existing functional test framework uses the `addnode` RPC to spin up manual connections between bitcoind nodes. This limits our ability to add integration tests for our networking code, which often executes different code paths for different connection types.
**This PR enables creating `outbound` & `block-relay-only` P2P connections in the functional tests.** This allows us to increase our p2p test coverage, since we can now verify expectations around these connection types.
This builds out the [prototype](https://github.com/bitcoin/bitcoin/issues/14210#issuecomment-527421978) proposed by ajtowns in #14210. 🙌🏽
An overview of this branch:
- introduces a new test-only RPC function `addconnection` which initiates opening an `outbound` or `block-relay-only` connection. (conceptually similar to `addnode` but for different connection types & restricted to regtest)
- adds `test_framework` support so a mininode can open an `outbound`/`block-relay-only` connection to a `P2PInterface`/`P2PConnection`.
- updates `p2p_blocksonly` tests to create a `block-relay-only` connection & verify expectations around transaction relay.
- introduces `p2p_add_connections` test that checks the behaviors of the newly introduced `add_outbound_p2p_connection` test framework function.
With these changes, there are many more behaviors that we can add integration tests for. The blocksonly updates is just one example.
Huge props to ajtowns for conceiving the approach & providing me feedback as I've built out this branch. Also thank you to jnewbery for lots of thoughtful input along the way.
ACKs for top commit:
troygiorshev:
reACK b4dd2ef800
jnewbery:
utACK b4dd2ef800
MarcoFalke:
Approach ACK b4dd2ef800🍢
Tree-SHA512: d1cba768c19c9c80e6a38b1c340cc86a90701b14772c4a0791c458f9097f6a4574b4a4acc7d13d6790c7b1f1f197e2c3d87996270f177402145f084ef8519a6b
fad1f0fd33 net: Remove unused cs_feeFilter (MarcoFalke)
Pull request description:
A `RecursiveMutex` is overkill for setting or reading a plain integer. Even a `Mutex` is overkill, when a plain `std::atomic` can be used.
This removes 11 lines of code. Also, it is cutting down on the number of locks put on the stack at the same time, which complicates review looking out for potential lock contention.
ACKs for top commit:
jnewbery:
utACK fad1f0fd33
practicalswift:
cr ACK fad1f0fd33: patch looks correct
Tree-SHA512: 647f9b954fbf52e138d3e710937eb9131b390fef0deae03fd6a162d5a18b9f194010800bbddc8f89208d91be2802dff11c3884d04b3dd233865abd12aa3cde06
faecb74562 Expose integral m_conn_type in CNodeStats, remove m_conn_type_string (Jon Atack)
Pull request description:
Currently, strings are stored for what are actually integral (strong) enum types. This is fine, because the strings are only used as-is for the debug log and RPC. However, it complicates using them in the GUI. User facing strings in the GUI should be translated and only string literals can be picked up for translation, not runtime `std::string`s.
Fix that by removing the `std::string` members and replace them by strong enum integral types.
ACKs for top commit:
jonatack:
Code review ACK faecb74562
theStack:
Code review ACK faecb74562🌲
Tree-SHA512: 24df2bd0645432060e393eb44b8abaf20fe296457d07a867b0e735c3e2e75af7b03fc6bfeca734ec33ab816a7c8e1f8591a5ec342f3afe3098a4e41f5c2cfebb
Add a new RPC endpoint to enable opening outbound connections from
the tests. The functional test framework currently uses the addnode RPC, which
has different behavior than general outbound peers. These changes enable
creating both full-relay and block-relay-only connections. The new RPC
endpoint calls through to a newly introduced AddConnection method on
CConnman that ensures we stay within the allocated max.
31b136e580 Don't declare de facto const reference variables as non-const (practicalswift)
1c65c075ee Don't declare de facto const member functions as non-const (practicalswift)
Pull request description:
_Meta: This is the second and final part of the `const` refactoring series (part one: #20581). **I promise: no more refactoring PRs from me in a while! :)** I'll now go back to focusing on fuzzing/hardening!_
Changes in this PR:
* Don't declare de facto const member functions as non-const
* Don't declare de facto const reference variables as non-const
Awards for finding candidates for the above changes go to:
* `clang-tidy`'s [`readability-make-member-function-const`](https://clang.llvm.org/extra/clang-tidy/checks/readability-make-member-function-const.html) check ([list of `clang-tidy` checks](https://clang.llvm.org/extra/clang-tidy/checks/list.html))
* `cppcheck`'s `constVariable` check ([list of `cppcheck` checks](https://sourceforge.net/p/cppcheck/wiki/ListOfChecks/))
See #18920 for instructions on how to analyse Bitcoin Core using Clang Static Analysis, `clang-tidy` and `cppcheck`.
ACKs for top commit:
ajtowns:
ACK 31b136e580
jonatack:
ACK 31b136e580
theStack:
ACK 31b136e580❄️
Tree-SHA512: f58f8f00744219426874379e9f3e9331132b9b48e954d24f3a85cbb858fdcc98009ed42ef7e7b4619ae8af9fc240a6d8bfc1c438db2e97b0ecd722a80dcfeffe
