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avoid directly overwriting wallet file

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This commit is contained in:
Sandip Patel 2019-12-11 17:02:26 +05:30
parent f1fef49373
commit d3ecbba3d7
1 changed files with 25 additions and 3 deletions
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28
libraries/wallet/wallet.cpp
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@ -1100,8 +1100,6 @@ public:
if( wallet_filename == "" )
wallet_filename = _wallet_filename;
wlog( "saving wallet to file ${fn}", ("fn", wallet_filename) );
string data = fc::json::to_pretty_string( _wallet );
try
{
@ -1112,14 +1110,38 @@ public:
//
// http://en.wikipedia.org/wiki/Most_vexing_parse
//
fc::ofstream outfile{ fc::path( wallet_filename ) };
std::string tmp_wallet_filename = wallet_filename + ".tmp";
fc::ofstream outfile{ fc::path( tmp_wallet_filename ) };
outfile.write( data.c_str(), data.length() );
outfile.flush();
outfile.close();
ilog( "saved successfully wallet to tmp file ${fn}", ("fn", tmp_wallet_filename) );
std::string wallet_file_content;
fc::read_file_contents(tmp_wallet_filename, wallet_file_content);
if (wallet_file_content == data) {
dlog( "validated successfully tmp wallet file ${fn}", ("fn", tmp_wallet_filename) );
fc::rename( tmp_wallet_filename, wallet_filename );
dlog( "renamed successfully tmp wallet file ${fn}", ("fn", tmp_wallet_filename) );
}
else
{
FC_THROW("tmp wallet file cannot be validated ${fn}", ("fn", tmp_wallet_filename) );
}
ilog( "successfully saved wallet to file ${fn}", ("fn", wallet_filename) );
disable_umask_protection();
}
catch(...)
{
string ws_password = _wallet.ws_password;
_wallet.ws_password = "";
elog("wallet file content is: ${data}", ("data", fc::json::to_pretty_string( _wallet ) ) );
_wallet.ws_password = ws_password;
disable_umask_protection();
throw;
}