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1462bde767
bdb3231 Implements a virtual destructor on the BaseRequestHandler class. (251)
Pull request description:
Granted that there is no undefined behavior in the current implementation, this PR implements a virtual destructor on the BaseRequestHandler class to protect against undefined behavior in the event that an object of a potential future derived BaseRequestHandler class with a destructor is destroyed through a pointer to this base class.
This PR also fixes "_warning: delete called on 'BaseRequestHandler' that is abstract but has non-virtual destructor [-Wdelete-non-virtual-dtor]_" warnings in environments where the project is built with the `-Wsystem-headers` flag; or environments where the `-Wdelete-non-virtual-dtor` diagnostics flag fires from system headers.
Tree-SHA512: 3c3b0797a8dbce8d8c5b244709e8bca41c4e28d5ba554a974bf7fc9128413e1098c457a00e51b21154ce6c11ce5da3071626e71d593b2550d0020bc589406eed
520 lines
21 KiB
C++
520 lines
21 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2017 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#if defined(HAVE_CONFIG_H)
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#include <config/bitcoin-config.h>
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#endif
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#include <chainparamsbase.h>
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#include <clientversion.h>
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#include <fs.h>
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#include <rpc/client.h>
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#include <rpc/protocol.h>
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#include <util.h>
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#include <utilstrencodings.h>
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#include <stdio.h>
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#include <event2/buffer.h>
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#include <event2/keyvalq_struct.h>
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#include <support/events.h>
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#include <univalue.h>
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static const char DEFAULT_RPCCONNECT[] = "127.0.0.1";
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static const int DEFAULT_HTTP_CLIENT_TIMEOUT=900;
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static const bool DEFAULT_NAMED=false;
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static const int CONTINUE_EXECUTION=-1;
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std::string HelpMessageCli()
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{
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const auto defaultBaseParams = CreateBaseChainParams(CBaseChainParams::MAIN);
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const auto testnetBaseParams = CreateBaseChainParams(CBaseChainParams::TESTNET);
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std::string strUsage;
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strUsage += HelpMessageGroup(_("Options:"));
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strUsage += HelpMessageOpt("-?", _("This help message"));
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strUsage += HelpMessageOpt("-conf=<file>", strprintf(_("Specify configuration file. Relative paths will be prefixed by datadir location. (default: %s)"), BITCOIN_CONF_FILENAME));
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strUsage += HelpMessageOpt("-datadir=<dir>", _("Specify data directory"));
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strUsage += HelpMessageOpt("-getinfo", _("Get general information from the remote server. Note that unlike server-side RPC calls, the results of -getinfo is the result of multiple non-atomic requests. Some entries in the result may represent results from different states (e.g. wallet balance may be as of a different block from the chain state reported)"));
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AppendParamsHelpMessages(strUsage);
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strUsage += HelpMessageOpt("-named", strprintf(_("Pass named instead of positional arguments (default: %s)"), DEFAULT_NAMED));
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strUsage += HelpMessageOpt("-rpcclienttimeout=<n>", strprintf(_("Timeout in seconds during HTTP requests, or 0 for no timeout. (default: %d)"), DEFAULT_HTTP_CLIENT_TIMEOUT));
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strUsage += HelpMessageOpt("-rpcconnect=<ip>", strprintf(_("Send commands to node running on <ip> (default: %s)"), DEFAULT_RPCCONNECT));
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strUsage += HelpMessageOpt("-rpcpassword=<pw>", _("Password for JSON-RPC connections"));
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strUsage += HelpMessageOpt("-rpcport=<port>", strprintf(_("Connect to JSON-RPC on <port> (default: %u or testnet: %u)"), defaultBaseParams->RPCPort(), testnetBaseParams->RPCPort()));
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strUsage += HelpMessageOpt("-rpcuser=<user>", _("Username for JSON-RPC connections"));
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strUsage += HelpMessageOpt("-rpcwait", _("Wait for RPC server to start"));
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strUsage += HelpMessageOpt("-rpcwallet=<walletname>", _("Send RPC for non-default wallet on RPC server (argument is wallet filename in bitcoind directory, required if bitcoind/-Qt runs with multiple wallets)"));
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strUsage += HelpMessageOpt("-stdin", _("Read extra arguments from standard input, one per line until EOF/Ctrl-D (recommended for sensitive information such as passphrases). When combined with -stdinrpcpass, the first line from standard input is used for the RPC password."));
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strUsage += HelpMessageOpt("-stdinrpcpass", strprintf(_("Read RPC password from standard input as a single line. When combined with -stdin, the first line from standard input is used for the RPC password.")));
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return strUsage;
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}
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//////////////////////////////////////////////////////////////////////////////
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//
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// Start
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//
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//
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// Exception thrown on connection error. This error is used to determine
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// when to wait if -rpcwait is given.
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//
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class CConnectionFailed : public std::runtime_error
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{
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public:
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explicit inline CConnectionFailed(const std::string& msg) :
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std::runtime_error(msg)
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{}
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};
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//
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// This function returns either one of EXIT_ codes when it's expected to stop the process or
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// CONTINUE_EXECUTION when it's expected to continue further.
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//
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static int AppInitRPC(int argc, char* argv[])
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{
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//
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// Parameters
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//
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gArgs.ParseParameters(argc, argv);
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if (argc<2 || gArgs.IsArgSet("-?") || gArgs.IsArgSet("-h") || gArgs.IsArgSet("-help") || gArgs.IsArgSet("-version")) {
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std::string strUsage = strprintf(_("%s RPC client version"), _(PACKAGE_NAME)) + " " + FormatFullVersion() + "\n";
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if (!gArgs.IsArgSet("-version")) {
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strUsage += "\n" + _("Usage:") + "\n" +
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" bitcoin-cli [options] <command> [params] " + strprintf(_("Send command to %s"), _(PACKAGE_NAME)) + "\n" +
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" bitcoin-cli [options] -named <command> [name=value] ... " + strprintf(_("Send command to %s (with named arguments)"), _(PACKAGE_NAME)) + "\n" +
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" bitcoin-cli [options] help " + _("List commands") + "\n" +
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" bitcoin-cli [options] help <command> " + _("Get help for a command") + "\n";
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strUsage += "\n" + HelpMessageCli();
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}
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fprintf(stdout, "%s", strUsage.c_str());
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if (argc < 2) {
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fprintf(stderr, "Error: too few parameters\n");
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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if (!fs::is_directory(GetDataDir(false))) {
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fprintf(stderr, "Error: Specified data directory \"%s\" does not exist.\n", gArgs.GetArg("-datadir", "").c_str());
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return EXIT_FAILURE;
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}
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try {
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gArgs.ReadConfigFile(gArgs.GetArg("-conf", BITCOIN_CONF_FILENAME));
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} catch (const std::exception& e) {
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fprintf(stderr,"Error reading configuration file: %s\n", e.what());
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return EXIT_FAILURE;
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}
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// Check for -testnet or -regtest parameter (BaseParams() calls are only valid after this clause)
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try {
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SelectBaseParams(ChainNameFromCommandLine());
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} catch (const std::exception& e) {
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fprintf(stderr, "Error: %s\n", e.what());
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return EXIT_FAILURE;
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}
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if (gArgs.GetBoolArg("-rpcssl", false))
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{
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fprintf(stderr, "Error: SSL mode for RPC (-rpcssl) is no longer supported.\n");
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return EXIT_FAILURE;
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}
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return CONTINUE_EXECUTION;
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}
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/** Reply structure for request_done to fill in */
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struct HTTPReply
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{
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HTTPReply(): status(0), error(-1) {}
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int status;
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int error;
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std::string body;
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};
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const char *http_errorstring(int code)
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{
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switch(code) {
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#if LIBEVENT_VERSION_NUMBER >= 0x02010300
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case EVREQ_HTTP_TIMEOUT:
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return "timeout reached";
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case EVREQ_HTTP_EOF:
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return "EOF reached";
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case EVREQ_HTTP_INVALID_HEADER:
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return "error while reading header, or invalid header";
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case EVREQ_HTTP_BUFFER_ERROR:
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return "error encountered while reading or writing";
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case EVREQ_HTTP_REQUEST_CANCEL:
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return "request was canceled";
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case EVREQ_HTTP_DATA_TOO_LONG:
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return "response body is larger than allowed";
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#endif
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default:
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return "unknown";
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}
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}
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static void http_request_done(struct evhttp_request *req, void *ctx)
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{
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HTTPReply *reply = static_cast<HTTPReply*>(ctx);
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if (req == nullptr) {
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/* If req is nullptr, it means an error occurred while connecting: the
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* error code will have been passed to http_error_cb.
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*/
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reply->status = 0;
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return;
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}
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reply->status = evhttp_request_get_response_code(req);
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struct evbuffer *buf = evhttp_request_get_input_buffer(req);
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if (buf)
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{
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size_t size = evbuffer_get_length(buf);
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const char *data = (const char*)evbuffer_pullup(buf, size);
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if (data)
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reply->body = std::string(data, size);
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evbuffer_drain(buf, size);
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}
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}
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#if LIBEVENT_VERSION_NUMBER >= 0x02010300
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static void http_error_cb(enum evhttp_request_error err, void *ctx)
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{
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HTTPReply *reply = static_cast<HTTPReply*>(ctx);
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reply->error = err;
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}
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#endif
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/** Class that handles the conversion from a command-line to a JSON-RPC request,
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* as well as converting back to a JSON object that can be shown as result.
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*/
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class BaseRequestHandler
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{
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public:
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virtual ~BaseRequestHandler() {}
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virtual UniValue PrepareRequest(const std::string& method, const std::vector<std::string>& args) = 0;
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virtual UniValue ProcessReply(const UniValue &batch_in) = 0;
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};
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/** Process getinfo requests */
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class GetinfoRequestHandler: public BaseRequestHandler
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{
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public:
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const int ID_NETWORKINFO = 0;
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const int ID_BLOCKCHAININFO = 1;
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const int ID_WALLETINFO = 2;
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/** Create a simulated `getinfo` request. */
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UniValue PrepareRequest(const std::string& method, const std::vector<std::string>& args) override
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{
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if (!args.empty()) {
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throw std::runtime_error("-getinfo takes no arguments");
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}
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UniValue result(UniValue::VARR);
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result.push_back(JSONRPCRequestObj("getnetworkinfo", NullUniValue, ID_NETWORKINFO));
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result.push_back(JSONRPCRequestObj("getblockchaininfo", NullUniValue, ID_BLOCKCHAININFO));
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result.push_back(JSONRPCRequestObj("getwalletinfo", NullUniValue, ID_WALLETINFO));
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return result;
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}
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/** Collect values from the batch and form a simulated `getinfo` reply. */
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UniValue ProcessReply(const UniValue &batch_in) override
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{
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UniValue result(UniValue::VOBJ);
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std::vector<UniValue> batch = JSONRPCProcessBatchReply(batch_in, 3);
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// Errors in getnetworkinfo() and getblockchaininfo() are fatal, pass them on
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// getwalletinfo() is allowed to fail in case there is no wallet.
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if (!batch[ID_NETWORKINFO]["error"].isNull()) {
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return batch[ID_NETWORKINFO];
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}
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if (!batch[ID_BLOCKCHAININFO]["error"].isNull()) {
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return batch[ID_BLOCKCHAININFO];
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}
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result.pushKV("version", batch[ID_NETWORKINFO]["result"]["version"]);
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result.pushKV("protocolversion", batch[ID_NETWORKINFO]["result"]["protocolversion"]);
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if (!batch[ID_WALLETINFO].isNull()) {
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result.pushKV("walletversion", batch[ID_WALLETINFO]["result"]["walletversion"]);
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result.pushKV("balance", batch[ID_WALLETINFO]["result"]["balance"]);
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}
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result.pushKV("blocks", batch[ID_BLOCKCHAININFO]["result"]["blocks"]);
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result.pushKV("timeoffset", batch[ID_NETWORKINFO]["result"]["timeoffset"]);
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result.pushKV("connections", batch[ID_NETWORKINFO]["result"]["connections"]);
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result.pushKV("proxy", batch[ID_NETWORKINFO]["result"]["networks"][0]["proxy"]);
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result.pushKV("difficulty", batch[ID_BLOCKCHAININFO]["result"]["difficulty"]);
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result.pushKV("testnet", UniValue(batch[ID_BLOCKCHAININFO]["result"]["chain"].get_str() == "test"));
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if (!batch[ID_WALLETINFO].isNull()) {
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result.pushKV("walletversion", batch[ID_WALLETINFO]["result"]["walletversion"]);
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result.pushKV("balance", batch[ID_WALLETINFO]["result"]["balance"]);
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result.pushKV("keypoololdest", batch[ID_WALLETINFO]["result"]["keypoololdest"]);
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result.pushKV("keypoolsize", batch[ID_WALLETINFO]["result"]["keypoolsize"]);
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if (!batch[ID_WALLETINFO]["result"]["unlocked_until"].isNull()) {
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result.pushKV("unlocked_until", batch[ID_WALLETINFO]["result"]["unlocked_until"]);
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}
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result.pushKV("paytxfee", batch[ID_WALLETINFO]["result"]["paytxfee"]);
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}
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result.pushKV("relayfee", batch[ID_NETWORKINFO]["result"]["relayfee"]);
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result.pushKV("warnings", batch[ID_NETWORKINFO]["result"]["warnings"]);
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return JSONRPCReplyObj(result, NullUniValue, 1);
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}
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};
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/** Process default single requests */
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class DefaultRequestHandler: public BaseRequestHandler {
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public:
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UniValue PrepareRequest(const std::string& method, const std::vector<std::string>& args) override
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{
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UniValue params;
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if(gArgs.GetBoolArg("-named", DEFAULT_NAMED)) {
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params = RPCConvertNamedValues(method, args);
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} else {
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params = RPCConvertValues(method, args);
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}
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return JSONRPCRequestObj(method, params, 1);
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}
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UniValue ProcessReply(const UniValue &reply) override
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{
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return reply.get_obj();
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}
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};
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static UniValue CallRPC(BaseRequestHandler *rh, const std::string& strMethod, const std::vector<std::string>& args)
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{
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std::string host;
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// In preference order, we choose the following for the port:
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// 1. -rpcport
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// 2. port in -rpcconnect (ie following : in ipv4 or ]: in ipv6)
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// 3. default port for chain
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int port = BaseParams().RPCPort();
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SplitHostPort(gArgs.GetArg("-rpcconnect", DEFAULT_RPCCONNECT), port, host);
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port = gArgs.GetArg("-rpcport", port);
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// Obtain event base
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raii_event_base base = obtain_event_base();
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// Synchronously look up hostname
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raii_evhttp_connection evcon = obtain_evhttp_connection_base(base.get(), host, port);
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evhttp_connection_set_timeout(evcon.get(), gArgs.GetArg("-rpcclienttimeout", DEFAULT_HTTP_CLIENT_TIMEOUT));
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HTTPReply response;
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raii_evhttp_request req = obtain_evhttp_request(http_request_done, (void*)&response);
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if (req == nullptr)
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throw std::runtime_error("create http request failed");
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#if LIBEVENT_VERSION_NUMBER >= 0x02010300
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evhttp_request_set_error_cb(req.get(), http_error_cb);
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#endif
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// Get credentials
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std::string strRPCUserColonPass;
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if (gArgs.GetArg("-rpcpassword", "") == "") {
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// Try fall back to cookie-based authentication if no password is provided
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if (!GetAuthCookie(&strRPCUserColonPass)) {
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throw std::runtime_error(strprintf(
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_("Could not locate RPC credentials. No authentication cookie could be found, and RPC password is not set. See -rpcpassword and -stdinrpcpass. Configuration file: (%s)"),
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GetConfigFile(gArgs.GetArg("-conf", BITCOIN_CONF_FILENAME)).string().c_str()));
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}
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} else {
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strRPCUserColonPass = gArgs.GetArg("-rpcuser", "") + ":" + gArgs.GetArg("-rpcpassword", "");
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}
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struct evkeyvalq* output_headers = evhttp_request_get_output_headers(req.get());
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assert(output_headers);
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evhttp_add_header(output_headers, "Host", host.c_str());
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evhttp_add_header(output_headers, "Connection", "close");
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evhttp_add_header(output_headers, "Authorization", (std::string("Basic ") + EncodeBase64(strRPCUserColonPass)).c_str());
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// Attach request data
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std::string strRequest = rh->PrepareRequest(strMethod, args).write() + "\n";
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struct evbuffer* output_buffer = evhttp_request_get_output_buffer(req.get());
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assert(output_buffer);
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evbuffer_add(output_buffer, strRequest.data(), strRequest.size());
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// check if we should use a special wallet endpoint
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std::string endpoint = "/";
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std::string walletName = gArgs.GetArg("-rpcwallet", "");
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if (!walletName.empty()) {
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char *encodedURI = evhttp_uriencode(walletName.c_str(), walletName.size(), false);
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if (encodedURI) {
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endpoint = "/wallet/"+ std::string(encodedURI);
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free(encodedURI);
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}
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else {
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throw CConnectionFailed("uri-encode failed");
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}
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}
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int r = evhttp_make_request(evcon.get(), req.get(), EVHTTP_REQ_POST, endpoint.c_str());
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req.release(); // ownership moved to evcon in above call
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if (r != 0) {
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throw CConnectionFailed("send http request failed");
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}
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event_base_dispatch(base.get());
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if (response.status == 0)
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throw CConnectionFailed(strprintf("couldn't connect to server: %s (code %d)\n(make sure server is running and you are connecting to the correct RPC port)", http_errorstring(response.error), response.error));
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else if (response.status == HTTP_UNAUTHORIZED)
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throw std::runtime_error("incorrect rpcuser or rpcpassword (authorization failed)");
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else if (response.status >= 400 && response.status != HTTP_BAD_REQUEST && response.status != HTTP_NOT_FOUND && response.status != HTTP_INTERNAL_SERVER_ERROR)
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throw std::runtime_error(strprintf("server returned HTTP error %d", response.status));
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else if (response.body.empty())
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throw std::runtime_error("no response from server");
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// Parse reply
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UniValue valReply(UniValue::VSTR);
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if (!valReply.read(response.body))
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throw std::runtime_error("couldn't parse reply from server");
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const UniValue reply = rh->ProcessReply(valReply);
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if (reply.empty())
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throw std::runtime_error("expected reply to have result, error and id properties");
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return reply;
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}
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int CommandLineRPC(int argc, char *argv[])
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{
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std::string strPrint;
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int nRet = 0;
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try {
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// Skip switches
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while (argc > 1 && IsSwitchChar(argv[1][0])) {
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argc--;
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argv++;
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}
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std::string rpcPass;
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if (gArgs.GetBoolArg("-stdinrpcpass", false)) {
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if (!std::getline(std::cin, rpcPass)) {
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throw std::runtime_error("-stdinrpcpass specified but failed to read from standard input");
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}
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gArgs.ForceSetArg("-rpcpassword", rpcPass);
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}
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std::vector<std::string> args = std::vector<std::string>(&argv[1], &argv[argc]);
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if (gArgs.GetBoolArg("-stdin", false)) {
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// Read one arg per line from stdin and append
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std::string line;
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while (std::getline(std::cin, line)) {
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args.push_back(line);
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}
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}
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std::unique_ptr<BaseRequestHandler> rh;
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std::string method;
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if (gArgs.GetBoolArg("-getinfo", false)) {
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rh.reset(new GetinfoRequestHandler());
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method = "";
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} else {
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rh.reset(new DefaultRequestHandler());
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if (args.size() < 1) {
|
|
throw std::runtime_error("too few parameters (need at least command)");
|
|
}
|
|
method = args[0];
|
|
args.erase(args.begin()); // Remove trailing method name from arguments vector
|
|
}
|
|
|
|
// Execute and handle connection failures with -rpcwait
|
|
const bool fWait = gArgs.GetBoolArg("-rpcwait", false);
|
|
do {
|
|
try {
|
|
const UniValue reply = CallRPC(rh.get(), method, args);
|
|
|
|
// Parse reply
|
|
const UniValue& result = find_value(reply, "result");
|
|
const UniValue& error = find_value(reply, "error");
|
|
|
|
if (!error.isNull()) {
|
|
// Error
|
|
int code = error["code"].get_int();
|
|
if (fWait && code == RPC_IN_WARMUP)
|
|
throw CConnectionFailed("server in warmup");
|
|
strPrint = "error: " + error.write();
|
|
nRet = abs(code);
|
|
if (error.isObject())
|
|
{
|
|
UniValue errCode = find_value(error, "code");
|
|
UniValue errMsg = find_value(error, "message");
|
|
strPrint = errCode.isNull() ? "" : "error code: "+errCode.getValStr()+"\n";
|
|
|
|
if (errMsg.isStr())
|
|
strPrint += "error message:\n"+errMsg.get_str();
|
|
|
|
if (errCode.isNum() && errCode.get_int() == RPC_WALLET_NOT_SPECIFIED) {
|
|
strPrint += "\nTry adding \"-rpcwallet=<filename>\" option to bitcoin-cli command line.";
|
|
}
|
|
}
|
|
} else {
|
|
// Result
|
|
if (result.isNull())
|
|
strPrint = "";
|
|
else if (result.isStr())
|
|
strPrint = result.get_str();
|
|
else
|
|
strPrint = result.write(2);
|
|
}
|
|
// Connection succeeded, no need to retry.
|
|
break;
|
|
}
|
|
catch (const CConnectionFailed&) {
|
|
if (fWait)
|
|
MilliSleep(1000);
|
|
else
|
|
throw;
|
|
}
|
|
} while (fWait);
|
|
}
|
|
catch (const boost::thread_interrupted&) {
|
|
throw;
|
|
}
|
|
catch (const std::exception& e) {
|
|
strPrint = std::string("error: ") + e.what();
|
|
nRet = EXIT_FAILURE;
|
|
}
|
|
catch (...) {
|
|
PrintExceptionContinue(nullptr, "CommandLineRPC()");
|
|
throw;
|
|
}
|
|
|
|
if (strPrint != "") {
|
|
fprintf((nRet == 0 ? stdout : stderr), "%s\n", strPrint.c_str());
|
|
}
|
|
return nRet;
|
|
}
|
|
|
|
int main(int argc, char* argv[])
|
|
{
|
|
SetupEnvironment();
|
|
if (!SetupNetworking()) {
|
|
fprintf(stderr, "Error: Initializing networking failed\n");
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
try {
|
|
int ret = AppInitRPC(argc, argv);
|
|
if (ret != CONTINUE_EXECUTION)
|
|
return ret;
|
|
}
|
|
catch (const std::exception& e) {
|
|
PrintExceptionContinue(&e, "AppInitRPC()");
|
|
return EXIT_FAILURE;
|
|
} catch (...) {
|
|
PrintExceptionContinue(nullptr, "AppInitRPC()");
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
int ret = EXIT_FAILURE;
|
|
try {
|
|
ret = CommandLineRPC(argc, argv);
|
|
}
|
|
catch (const std::exception& e) {
|
|
PrintExceptionContinue(&e, "CommandLineRPC()");
|
|
} catch (...) {
|
|
PrintExceptionContinue(nullptr, "CommandLineRPC()");
|
|
}
|
|
return ret;
|
|
}
|