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init: error out if -maxconnections is negative

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This commit is contained in:
Sergi Delgado Segura 2024-05-24 11:55:53 -04:00
parent c773649481
commit d4c7c4009d
1 changed files with 5 additions and 3 deletions
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8
src/init.cpp
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@ -994,12 +994,14 @@ bool AppInitParameterInteraction(const ArgsManager& args)
int nBind = std::max(nUserBind, size_t(1));
// Maximum number of connections with other nodes, this accounts for all types of outbounds and inbounds except for manual
int user_max_connection = args.GetIntArg("-maxconnections", DEFAULT_MAX_PEER_CONNECTIONS);
nMaxConnections = std::max(user_max_connection, 0);
if (user_max_connection < 0) {
return InitError(Untranslated("-maxconnections must be greater or equal than zero"));
}
// Reserve enough FDs to account for the bare minimum, plus any manual connections, plus the bound interfaces
int min_required_fds = MIN_CORE_FDS + MAX_ADDNODE_CONNECTIONS + nBind;
// Try raising the FD limit to what we need (available_fds may be smaller than the requested amount if this fails)
available_fds = RaiseFileDescriptorLimit(nMaxConnections + min_required_fds);
available_fds = RaiseFileDescriptorLimit(user_max_connection + min_required_fds);
// If we are using select instead of poll, our actual limit may be even smaller
#ifndef USE_POLL
available_fds = std::min(FD_SETSIZE, available_fds);
@ -1008,7 +1010,7 @@ bool AppInitParameterInteraction(const ArgsManager& args)
return InitError(strprintf(_("Not enough file descriptors available. %d available, %d required."), available_fds, min_required_fds));
// Trim requested connection counts, to fit into system limitations
nMaxConnections = std::min(available_fds - min_required_fds, nMaxConnections);
nMaxConnections = std::min(available_fds - min_required_fds, user_max_connection);
if (nMaxConnections < user_max_connection)
InitWarning(strprintf(_("Reducing -maxconnections from %d to %d, because of system limitations."), user_max_connection, nMaxConnections));