Merge bitcoin/bitcoin#22791: init: Fix asmap/addrman initialization order bug

724c4975622bc22cedc3f3814dfc8e66cf8371f7 [fuzz] Add ConsumeAsmap() function (John Newbery)
5840476714ffebb2599999c85a23b52ebcff6090 [addrman] Make m_asmap private (John Newbery)
f9002cb5dbd573cd9ca200de21319fa296e26055 [net] Rename the copyStats arg from m_asmap to asmap (John Newbery)
f572f2b2048994b3b50f4cfd5de19e40b1acfb22 [addrman] Set m_asmap in CAddrMan initializer list (John Newbery)
593247872decd6d483a76e96d79433247226ad14 [net] Remove CConnMan::SetAsmap() (John Newbery)
50fd77045e2f858a53486b5e02e1798c92ab946c [init] Read/decode asmap before constructing addrman (John Newbery)

Pull request description:

  Commit 181a1207 introduced an initialization order bug: CAddrMan's m_asmap must be set before deserializing peers.dat.

  The first commit restores the correct initialization order. The remaining commits make `CAddrMan::m_asmap` usage safer:

  - don't reach into `CAddrMan`'s internal data from `CConnMan`
  - set `m_asmap` in the initializer list and make it const
  - make `m_asmap` private, and access it (as a reference to const) from a getter.

  This ensures that peers.dat deserialization must happen after setting m_asmap, since m_asmap is set during CAddrMan construction.

ACKs for top commit:
  mzumsande:
    Tested ACK 724c4975622bc22cedc3f3814dfc8e66cf8371f7
  amitiuttarwar:
    code review but utACK 724c497562
  naumenkogs:
    utACK 724c4975622bc22cedc3f3814dfc8e66cf8371f7
  vasild:
    ACK 724c4975622bc22cedc3f3814dfc8e66cf8371f7
  MarcoFalke:
    review ACK 724c4975622bc22cedc3f3814dfc8e66cf8371f7 👫

Tree-SHA512: 684a4cf9e3d4496c9997fb2bc4ec874809987055c157ec3fad1d2143b8223df52b5a0af787d028930b27388c8efeba0aeb2446cb35c337a5552ae76112ade726

1 files changed, 19 insertions, 17 deletions

diff --git a/src/addrman.h b/src/addrman.h
index 2548b891ba..74bfe9748b 100644
--- a/src/addrman.h
+++ b/src/addrman.h
@@ -149,22 +149,6 @@ static constexpr int ADDRMAN_BUCKET_SIZE{1 << ADDRMAN_BUCKET_SIZE_LOG2};
 class CAddrMan
 {
 public:
-    // Compressed IP->ASN mapping, loaded from a file when a node starts.
-    // Should be always empty if no file was provided.
-    // This mapping is then used for bucketing nodes in Addrman.
-    //
-    // If asmap is provided, nodes will be bucketed by
-    // AS they belong to, in order to make impossible for a node
-    // to connect to several nodes hosted in a single AS.
-    // This is done in response to Erebus attack, but also to generally
-    // diversify the connections every node creates,
-    // especially useful when a large fraction of nodes
-    // operate under a couple of cloud providers.
-    //
-    // If a new asmap was provided, the existing records
-    // would be re-bucketed accordingly.
-    std::vector<bool> m_asmap;
-
     // Read asmap from provided binary file
     static std::vector<bool> DecodeAsmap(fs::path path);
 
@@ -174,7 +158,7 @@ public:
     template <typename Stream>
     void Unserialize(Stream& s_) EXCLUSIVE_LOCKS_REQUIRED(!cs);
 
-    explicit CAddrMan(bool deterministic, int32_t consistency_check_ratio);
+    explicit CAddrMan(std::vector<bool> asmap, bool deterministic, int32_t consistency_check_ratio);
 
     ~CAddrMan()
     {
@@ -296,6 +280,8 @@ public:
         Check();
     }
 
+    const std::vector<bool>& GetAsmap() const { return m_asmap; }
+
 private:
     //! A mutex to protect the inner data structures.
     mutable Mutex cs;
@@ -363,6 +349,22 @@ private:
     /** Perform consistency checks every m_consistency_check_ratio operations (if non-zero). */
     const int32_t m_consistency_check_ratio;
 
+    // Compressed IP->ASN mapping, loaded from a file when a node starts.
+    // Should be always empty if no file was provided.
+    // This mapping is then used for bucketing nodes in Addrman.
+    //
+    // If asmap is provided, nodes will be bucketed by
+    // AS they belong to, in order to make impossible for a node
+    // to connect to several nodes hosted in a single AS.
+    // This is done in response to Erebus attack, but also to generally
+    // diversify the connections every node creates,
+    // especially useful when a large fraction of nodes
+    // operate under a couple of cloud providers.
+    //
+    // If a new asmap was provided, the existing records
+    // would be re-bucketed accordingly.
+    const std::vector<bool> m_asmap;
+
     //! Find an entry.
     CAddrInfo* Find(const CNetAddr& addr, int *pnId = nullptr) EXCLUSIVE_LOCKS_REQUIRED(cs);