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
