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Add CaptureMessage

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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.
This commit is contained in:
Troy Giorshev
2020-07-13 13:20:47 -04:00
parent dbf779d5de
commit f2a77ff97b
3 changed files with 38 additions and 3 deletions
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7
src/init.cpp
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@@ -1042,16 +1042,17 @@ bool AppInitParameterInteraction(const ArgsManager& args)
// Trim requested connection counts, to fit into system limitations
// <int> in std::min<int>(...) to work around FreeBSD compilation issue described in #2695
nFD = RaiseFileDescriptorLimit(nMaxConnections + MIN_CORE_FILEDESCRIPTORS + MAX_ADDNODE_CONNECTIONS + nBind);
nFD = RaiseFileDescriptorLimit(nMaxConnections + MIN_CORE_FILEDESCRIPTORS + MAX_ADDNODE_CONNECTIONS + nBind + NUM_FDS_MESSAGE_CAPTURE);
#ifdef USE_POLL
int fd_max = nFD;
#else
int fd_max = FD_SETSIZE;
#endif
nMaxConnections = std::max(std::min<int>(nMaxConnections, fd_max - nBind - MIN_CORE_FILEDESCRIPTORS - MAX_ADDNODE_CONNECTIONS), 0);
nMaxConnections = std::max(std::min<int>(nMaxConnections, fd_max - nBind - MIN_CORE_FILEDESCRIPTORS - MAX_ADDNODE_CONNECTIONS - NUM_FDS_MESSAGE_CAPTURE), 0);
if (nFD < MIN_CORE_FILEDESCRIPTORS)
return InitError(_("Not enough file descriptors available."));
nMaxConnections = std::min(nFD - MIN_CORE_FILEDESCRIPTORS - MAX_ADDNODE_CONNECTIONS, nMaxConnections);
nMaxConnections = std::min(nFD - MIN_CORE_FILEDESCRIPTORS - MAX_ADDNODE_CONNECTIONS - NUM_FDS_MESSAGE_CAPTURE, nMaxConnections);
if (nMaxConnections < nUserMaxConnections)
InitWarning(strprintf(_("Reducing -maxconnections from %d to %d, because of system limitations."), nUserMaxConnections, nMaxConnections));