tomFlowee
b4a3da2642
These are technically static libs, but not in any way shared libs. They are used solely only by this repo and really only by the hub. Most important, no header files are installed and basically none of the normal rules for reusable libraries are applied to these files.
693 lines
21 KiB
C++
693 lines
21 KiB
C++
/*
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* This file is part of the Flowee project
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* Copyright (c) 2015 The Bitcoin Core developers
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "httpserver.h"
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#include <SettingsDefaults.h>
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#include "chainparamsbase.h"
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#include <policy/policy.h>
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#include "compat.h"
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#include "util.h"
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#include "netbase.h"
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#include "rpcprotocol.h" // For HTTP status codes
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#include "sync.h"
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#include "UiInterface.h"
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#include <utils/utilstrencodings.h>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <csignal>
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#include <event2/event.h>
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#include <event2/http.h>
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#include <event2/thread.h>
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#include <event2/buffer.h>
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#include <event2/util.h>
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#include <event2/keyvalq_struct.h>
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#ifdef EVENT__HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#ifdef _XOPEN_SOURCE_EXTENDED
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#include <arpa/inet.h>
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#endif
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#endif
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#include <boost/algorithm/string/case_conv.hpp> // for to_lower()
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#include <boost/foreach.hpp>
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#include <boost/scoped_ptr.hpp>
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/** Maximum size of http request (request line + headers) */
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static constexpr size_t MAX_HEADERS_SIZE = 8192;
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/**
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* Maximum HTTP post body size. Twice the maximum block size is added to this
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* value in practice.
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*/
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static constexpr size_t MIN_SUPPORTED_BODY_SIZE = 0x02000000;
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/** HTTP request work item */
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class HTTPWorkItem : public HTTPClosure
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{
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public:
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HTTPWorkItem(HTTPRequest* req, const std::string &path, const HTTPRequestHandler& func):
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req(req), path(path), func(func)
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{
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}
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void operator()()
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{
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func(req.get(), path);
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}
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boost::scoped_ptr<HTTPRequest> req;
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private:
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std::string path;
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HTTPRequestHandler func;
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};
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/** Simple work queue for distributing work over multiple threads.
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* Work items are simply callable objects.
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*/
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template <typename WorkItem>
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class WorkQueue
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{
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private:
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/** Mutex protects entire object */
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CWaitableCriticalSection cs;
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CConditionVariable cond;
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/* XXX in C++11 we can use std::unique_ptr here and avoid manual cleanup */
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std::deque<WorkItem*> queue;
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bool running;
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size_t maxDepth;
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int numThreads;
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/** RAII object to keep track of number of running worker threads */
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class ThreadCounter
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{
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public:
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WorkQueue &wq;
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ThreadCounter(WorkQueue &w): wq(w)
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{
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boost::lock_guard<boost::mutex> lock(wq.cs);
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wq.numThreads += 1;
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}
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~ThreadCounter()
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{
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boost::lock_guard<boost::mutex> lock(wq.cs);
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wq.numThreads -= 1;
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wq.cond.notify_all();
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}
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};
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public:
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WorkQueue(size_t maxDepth) : running(true),
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maxDepth(maxDepth),
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numThreads(0)
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{
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}
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/*( Precondition: worker threads have all stopped
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* (call WaitExit)
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*/
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~WorkQueue()
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{
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while (!queue.empty()) {
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delete queue.front();
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queue.pop_front();
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}
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}
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/** Enqueue a work item */
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bool Enqueue(WorkItem* item)
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{
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boost::unique_lock<boost::mutex> lock(cs);
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if (queue.size() >= maxDepth) {
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return false;
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}
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queue.push_back(item);
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cond.notify_one();
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return true;
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}
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/** Thread function */
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void Run()
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{
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ThreadCounter count(*this);
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while (running) {
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WorkItem* i = 0;
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{
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boost::unique_lock<boost::mutex> lock(cs);
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while (running && queue.empty())
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cond.wait(lock);
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if (!running)
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break;
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i = queue.front();
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queue.pop_front();
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}
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(*i)();
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delete i;
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}
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}
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/** Interrupt and exit loops */
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void Interrupt()
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{
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boost::unique_lock<boost::mutex> lock(cs);
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running = false;
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cond.notify_all();
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}
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/** Wait for worker threads to exit */
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void WaitExit()
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{
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boost::unique_lock<boost::mutex> lock(cs);
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while (numThreads > 0)
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cond.wait(lock);
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}
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/** Return current depth of queue */
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size_t Depth()
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{
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boost::unique_lock<boost::mutex> lock(cs);
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return queue.size();
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}
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};
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struct HTTPPathHandler
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{
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HTTPPathHandler() {}
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HTTPPathHandler(std::string prefix, bool exactMatch, HTTPRequestHandler handler):
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prefix(prefix), exactMatch(exactMatch), handler(handler)
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{
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}
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std::string prefix;
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bool exactMatch;
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HTTPRequestHandler handler;
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};
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/** HTTP module state */
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//! libevent event loop
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static struct event_base* eventBase = 0;
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//! HTTP server
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struct evhttp* eventHTTP = 0;
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//! List of subnets to allow RPC connections from
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static std::vector<CSubNet> rpc_allow_subnets;
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//! Work queue for handling longer requests off the event loop thread
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static WorkQueue<HTTPClosure>* workQueue = 0;
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//! Handlers for (sub)paths
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std::vector<HTTPPathHandler> pathHandlers;
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//! Bound listening sockets
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std::vector<evhttp_bound_socket *> boundSockets;
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/** Check if a network address is allowed to access the HTTP server */
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static bool ClientAllowed(const CNetAddr& netaddr)
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{
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if (!netaddr.IsValid())
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return false;
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BOOST_FOREACH (const CSubNet& subnet, rpc_allow_subnets)
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if (subnet.Match(netaddr))
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return true;
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return false;
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}
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/** Initialize ACL list for HTTP server */
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static bool InitHTTPAllowList()
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{
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rpc_allow_subnets.clear();
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rpc_allow_subnets.push_back(CSubNet("127.0.0.0/8")); // always allow IPv4 local subnet
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rpc_allow_subnets.push_back(CSubNet("::1")); // always allow IPv6 localhost
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if (mapMultiArgs.count("-rpcallowip")) {
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const std::vector<std::string>& vAllow = mapMultiArgs["-rpcallowip"];
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BOOST_FOREACH (std::string strAllow, vAllow) {
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CSubNet subnet(strAllow);
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if (!subnet.IsValid()) {
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uiInterface.ThreadSafeMessageBox(
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strprintf("Invalid -rpcallowip subnet specification: %s. Valid are a single IP (e.g. 1.2.3.4), a network/netmask (e.g. 1.2.3.4/255.255.255.0) or a network/CIDR (e.g. 1.2.3.4/24).", strAllow),
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"", CClientUIInterface::MSG_ERROR);
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return false;
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}
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rpc_allow_subnets.push_back(subnet);
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}
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}
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std::string strAllowed;
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BOOST_FOREACH (const CSubNet& subnet, rpc_allow_subnets)
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strAllowed += subnet.ToString() + " ";
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logCritical(Log::HTTP) << "Allowing HTTP connections from:" << strAllowed;
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return true;
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}
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/** HTTP request method as string - use for logging only */
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static std::string RequestMethodString(HTTPRequest::RequestMethod m)
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{
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switch (m) {
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case HTTPRequest::GET:
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return "GET";
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break;
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case HTTPRequest::POST:
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return "POST";
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break;
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case HTTPRequest::HEAD:
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return "HEAD";
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break;
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case HTTPRequest::PUT:
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return "PUT";
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break;
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default:
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return "unknown";
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}
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}
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/** HTTP request callback */
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static void http_request_cb(struct evhttp_request* req, void* arg)
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{
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std::unique_ptr<HTTPRequest> hreq(new HTTPRequest(req));
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logInfo(Log::HTTP) << "Received a" << RequestMethodString(hreq->GetRequestMethod()) << "request for"
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<< hreq->GetURI() << "from" << hreq->GetPeer().ToString();
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// Early address-based allow check
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if (!ClientAllowed(hreq->GetPeer())) {
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hreq->WriteReply(HTTP_FORBIDDEN);
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return;
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}
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// Early reject unknown HTTP methods
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if (hreq->GetRequestMethod() == HTTPRequest::UNKNOWN) {
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hreq->WriteReply(HTTP_BADMETHOD);
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return;
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}
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// Find registered handler for prefix
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std::string strURI = hreq->GetURI();
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std::string path;
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std::vector<HTTPPathHandler>::const_iterator i = pathHandlers.begin();
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std::vector<HTTPPathHandler>::const_iterator iend = pathHandlers.end();
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for (; i != iend; ++i) {
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bool match = false;
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if (i->exactMatch)
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match = (strURI == i->prefix);
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else
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match = (strURI.substr(0, i->prefix.size()) == i->prefix);
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if (match) {
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path = strURI.substr(i->prefix.size());
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break;
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}
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}
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// Dispatch to worker thread
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if (i != iend) {
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std::unique_ptr<HTTPWorkItem> item(new HTTPWorkItem(hreq.release(), path, i->handler));
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assert(workQueue);
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if (workQueue->Enqueue(item.get()))
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item.release(); /* if true, queue took ownership */
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else
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item->req->WriteReply(HTTP_INTERNAL, "Work queue depth exceeded");
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} else {
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hreq->WriteReply(HTTP_NOTFOUND);
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}
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}
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/** Callback to reject HTTP requests after shutdown. */
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static void http_reject_request_cb(struct evhttp_request* req, void*)
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{
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logDebug(Log::HTTP) << "Rejecting request while shutting down";
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evhttp_send_error(req, HTTP_SERVUNAVAIL, NULL);
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}
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/** Event dispatcher thread */
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static void ThreadHTTP(struct event_base* base, struct evhttp* http)
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{
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RenameThread("bitcoin-http");
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logDebug(Log::HTTP) << "Entering http event loop";
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event_base_dispatch(base);
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// Event loop will be interrupted by InterruptHTTPServer()
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logDebug(Log::HTTP) << "Exited http event loop";
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}
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/** Bind HTTP server to specified addresses */
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static bool HTTPBindAddresses(struct evhttp* http)
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{
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int defaultPort = GetArg("-rpcport", BaseParams().RPCPort());
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std::vector<std::pair<std::string, uint16_t> > endpoints;
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// Determine what addresses to bind to
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if (!mapArgs.count("-rpcallowip")) { // Default to loopback if not allowing external IPs
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endpoints.push_back(std::make_pair("::1", defaultPort));
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endpoints.push_back(std::make_pair("127.0.0.1", defaultPort));
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if (mapArgs.count("-rpcbind")) {
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logCritical(Log::HTTP) << "WARNING: option -rpcbind was ignored because -rpcallowip was not specified, refusing to allow everyone to connect";
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}
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} else if (mapArgs.count("-rpcbind")) { // Specific bind address
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const std::vector<std::string>& vbind = mapMultiArgs["-rpcbind"];
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for (std::vector<std::string>::const_iterator i = vbind.begin(); i != vbind.end(); ++i) {
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uint16_t port = defaultPort;
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std::string host;
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SplitHostPort(*i, port, host);
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endpoints.push_back(std::make_pair(host, port));
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}
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} else { // No specific bind address specified, bind to any
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endpoints.push_back(std::make_pair("::", defaultPort));
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endpoints.push_back(std::make_pair("0.0.0.0", defaultPort));
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}
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// Bind addresses
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for (std::vector<std::pair<std::string, uint16_t> >::iterator i = endpoints.begin(); i != endpoints.end(); ++i) {
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logInfo(Log::HTTP) << "Binding RPC on address" << i->first << "port" << i->second;
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evhttp_bound_socket *bind_handle = evhttp_bind_socket_with_handle(http, i->first.empty() ? NULL : i->first.c_str(), i->second);
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if (bind_handle) {
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boundSockets.push_back(bind_handle);
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} else {
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logFatal(Log::HTTP) <<"Binding RPC on address" << i->first << "port" << i->second << "failed";
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}
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}
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return !boundSockets.empty();
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}
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/** Simple wrapper to set thread name and run work queue */
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static void HTTPWorkQueueRun(WorkQueue<HTTPClosure>* queue)
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{
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RenameThread("httpworker");
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queue->Run();
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}
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/** libevent event log callback */
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static void libevent_log_cb(int severity, const char *msg)
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{
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#ifndef EVENT_LOG_WARN
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// EVENT_LOG_WARN was added in 2.0.19; but before then _EVENT_LOG_WARN existed.
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# define EVENT_LOG_WARN _EVENT_LOG_WARN
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#endif
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switch (severity) {
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case EVENT_LOG_DEBUG: logDebug(Log::LibEvent) << msg; break;
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case EVENT_LOG_MSG: logInfo(Log::LibEvent) << msg; break;
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case EVENT_LOG_WARN: logWarning(Log::LibEvent) << msg; break;
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case EVENT_LOG_ERR: logCritical(Log::LibEvent) << msg; break;
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}
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}
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bool InitHTTPServer()
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{
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struct evhttp* http = 0;
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struct event_base* base = 0;
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if (!InitHTTPAllowList())
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return false;
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// Redirect libevent's logging to our own log
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event_set_log_callback(&libevent_log_cb);
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#if LIBEVENT_VERSION_NUMBER >= 0x02010100
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if (Log::Manager::instance()->isEnabled(Log::LibEvent, Log::DebugLevel))
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event_enable_debug_logging(EVENT_DBG_ALL);
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else
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event_enable_debug_logging(EVENT_DBG_NONE);
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#endif
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#ifdef WIN32
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evthread_use_windows_threads();
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#else
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evthread_use_pthreads();
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#endif
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base = event_base_new(); // XXX RAII
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if (!base) {
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logCritical(Log::LibEvent) << "Couldn't create an event_base: exiting";
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return false;
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}
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/* Create a new evhttp object to handle requests. */
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http = evhttp_new(base); // XXX RAII
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if (!http) {
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logCritical(Log::LibEvent) << "couldn't create evhttp. Exiting.";
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event_base_free(base);
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return false;
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}
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evhttp_set_timeout(http, GetArg("-rpcservertimeout", Settings::DefaultHttpServerTimeout));
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evhttp_set_max_headers_size(http, MAX_HEADERS_SIZE);
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evhttp_set_max_body_size(http, MIN_SUPPORTED_BODY_SIZE + 2 * Policy::blockSizeAcceptLimit());
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evhttp_set_gencb(http, http_request_cb, NULL);
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if (!HTTPBindAddresses(http)) {
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logCritical(Log::LibEvent) << "Unable to bind any endpoint for RPC server";
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evhttp_free(http);
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event_base_free(base);
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return false;
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}
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logCritical(Log::HTTP) << "Initialized HTTP server";
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int workQueueDepth = std::max((long)GetArg("-rpcworkqueue", Settings::DefaultHttpWorkQueue), 1L);
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logInfo(Log::HTTP) << "creating work queue of depth" << workQueueDepth;
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workQueue = new WorkQueue<HTTPClosure>(workQueueDepth);
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eventBase = base;
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eventHTTP = http;
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return true;
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}
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boost::thread threadHTTP;
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void StartHTTPServer()
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{
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logInfo(Log::HTTP) << "Starting HTTP server";
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int rpcThreads = std::max((long)GetArg("-rpcthreads", Settings::DefaultHttpThreads), 1L);
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logInfo(Log::HTTP) << "starting" << rpcThreads << "worker threads";
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threadHTTP = boost::thread(std::bind(&ThreadHTTP, eventBase, eventHTTP));
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for (int i = 0; i < rpcThreads; i++)
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boost::thread(std::bind(&HTTPWorkQueueRun, workQueue));
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}
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void InterruptHTTPServer()
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{
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if (eventHTTP) {
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logCritical(Log::HTTP) << "Interrupting HTTP server";
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// Unlisten sockets
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BOOST_FOREACH (evhttp_bound_socket *socket, boundSockets) {
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evhttp_del_accept_socket(eventHTTP, socket);
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}
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// Reject requests on current connections
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evhttp_set_gencb(eventHTTP, http_reject_request_cb, NULL);
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}
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if (workQueue)
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workQueue->Interrupt();
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}
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void StopHTTPServer()
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{
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bool stopped = false;
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if (workQueue) {
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stopped = true;
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logCritical(Log::HTTP) << "Stopping HTTP server";
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logInfo(Log::HTTP) << "Waiting for HTTP worker threads to exit";
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workQueue->WaitExit();
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delete workQueue;
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}
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if (eventBase) {
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stopped = true;
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logInfo(Log::HTTP) << "Waiting for HTTP event thread to exit";
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// Give event loop a few seconds to exit (to send back last RPC responses), then break it
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// Before this was solved with event_base_loopexit, but that didn't work as expected in
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// at least libevent 2.0.21 and always introduced a delay. In libevent
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// master that appears to be solved, so in the future that solution
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// could be used again (if desirable).
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// (see discussion in https://github.com/bitcoin/bitcoin/pull/6990)
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#if BOOST_VERSION >= 105000
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if (!threadHTTP.try_join_for(boost::chrono::milliseconds(2000))) {
|
|
#else
|
|
if (!threadHTTP.timed_join(boost::posix_time::milliseconds(2000))) {
|
|
#endif
|
|
logCritical(Log::HTTP) << "HTTP event loop did not exit within allotted time, sending loopbreak";
|
|
event_base_loopbreak(eventBase);
|
|
threadHTTP.join();
|
|
}
|
|
}
|
|
if (eventHTTP) {
|
|
stopped = true;
|
|
evhttp_free(eventHTTP);
|
|
eventHTTP = 0;
|
|
}
|
|
if (eventBase) {
|
|
stopped = true;
|
|
event_base_free(eventBase);
|
|
eventBase = 0;
|
|
}
|
|
if (stopped)
|
|
logCritical(Log::HTTP) << "Stopped HTTP server";
|
|
}
|
|
|
|
struct event_base* EventBase()
|
|
{
|
|
return eventBase;
|
|
}
|
|
|
|
static void httpevent_callback_fn(evutil_socket_t, short, void* data)
|
|
{
|
|
// Static handler: simply call inner handler
|
|
HTTPEvent *self = ((HTTPEvent*)data);
|
|
self->handler();
|
|
if (self->deleteWhenTriggered)
|
|
delete self;
|
|
}
|
|
|
|
HTTPEvent::HTTPEvent(struct event_base* base, bool deleteWhenTriggered, const boost::function<void(void)>& handler):
|
|
deleteWhenTriggered(deleteWhenTriggered), handler(handler)
|
|
{
|
|
ev = event_new(base, -1, 0, httpevent_callback_fn, this);
|
|
assert(ev);
|
|
}
|
|
HTTPEvent::~HTTPEvent()
|
|
{
|
|
event_free(ev);
|
|
}
|
|
void HTTPEvent::trigger(struct timeval* tv)
|
|
{
|
|
if (tv == NULL)
|
|
event_active(ev, 0, 0); // immediately trigger event in main thread
|
|
else
|
|
evtimer_add(ev, tv); // trigger after timeval passed
|
|
}
|
|
HTTPRequest::HTTPRequest(struct evhttp_request* req) : req(req),
|
|
replySent(false)
|
|
{
|
|
}
|
|
HTTPRequest::~HTTPRequest()
|
|
{
|
|
if (!replySent) {
|
|
// Keep track of whether reply was sent to avoid request leaks
|
|
logDebug(Log::HTTP) << "Unhandled request";
|
|
WriteReply(HTTP_INTERNAL, "Unhandled request");
|
|
}
|
|
// evhttpd cleans up the request, as long as a reply was sent.
|
|
}
|
|
|
|
std::pair<bool, std::string> HTTPRequest::GetHeader(const std::string& hdr)
|
|
{
|
|
const struct evkeyvalq* headers = evhttp_request_get_input_headers(req);
|
|
assert(headers);
|
|
const char* val = evhttp_find_header(headers, hdr.c_str());
|
|
if (val)
|
|
return std::make_pair(true, val);
|
|
else
|
|
return std::make_pair(false, "");
|
|
}
|
|
|
|
std::string HTTPRequest::ReadBody()
|
|
{
|
|
struct evbuffer* buf = evhttp_request_get_input_buffer(req);
|
|
if (!buf)
|
|
return "";
|
|
size_t size = evbuffer_get_length(buf);
|
|
/** Trivial implementation: if this is ever a performance bottleneck,
|
|
* internal copying can be avoided in multi-segment buffers by using
|
|
* evbuffer_peek and an awkward loop. Though in that case, it'd be even
|
|
* better to not copy into an intermediate string but use a stream
|
|
* abstraction to consume the evbuffer on the fly in the parsing algorithm.
|
|
*/
|
|
const char* data = (const char*)evbuffer_pullup(buf, size);
|
|
if (!data) // returns NULL in case of empty buffer
|
|
return "";
|
|
std::string rv(data, size);
|
|
evbuffer_drain(buf, size);
|
|
return rv;
|
|
}
|
|
|
|
void HTTPRequest::WriteHeader(const std::string& hdr, const std::string& value)
|
|
{
|
|
struct evkeyvalq* headers = evhttp_request_get_output_headers(req);
|
|
assert(headers);
|
|
evhttp_add_header(headers, hdr.c_str(), value.c_str());
|
|
}
|
|
|
|
/** Closure sent to main thread to request a reply to be sent to
|
|
* a HTTP request.
|
|
* Replies must be sent in the main loop in the main http thread,
|
|
* this cannot be done from worker threads.
|
|
*/
|
|
void HTTPRequest::WriteReply(int nStatus, const std::string& strReply)
|
|
{
|
|
assert(!replySent && req);
|
|
// Send event to main http thread to send reply message
|
|
struct evbuffer* evb = evhttp_request_get_output_buffer(req);
|
|
assert(evb);
|
|
evbuffer_add(evb, strReply.data(), strReply.size());
|
|
HTTPEvent* ev = new HTTPEvent(eventBase, true,
|
|
std::bind(evhttp_send_reply, req, nStatus, (const char*)NULL, (struct evbuffer *)NULL));
|
|
ev->trigger(0);
|
|
replySent = true;
|
|
req = 0; // transferred back to main thread
|
|
}
|
|
|
|
CService HTTPRequest::GetPeer()
|
|
{
|
|
evhttp_connection* con = evhttp_request_get_connection(req);
|
|
CService peer;
|
|
if (con) {
|
|
// evhttp retains ownership over returned address string
|
|
const char* address = "";
|
|
uint16_t port = 0;
|
|
evhttp_connection_get_peer(con, (char**)&address, &port);
|
|
peer = CService(address, port);
|
|
}
|
|
return peer;
|
|
}
|
|
|
|
std::string HTTPRequest::GetURI()
|
|
{
|
|
return evhttp_request_get_uri(req);
|
|
}
|
|
|
|
HTTPRequest::RequestMethod HTTPRequest::GetRequestMethod()
|
|
{
|
|
switch (evhttp_request_get_command(req)) {
|
|
case EVHTTP_REQ_GET:
|
|
return GET;
|
|
break;
|
|
case EVHTTP_REQ_POST:
|
|
return POST;
|
|
break;
|
|
case EVHTTP_REQ_HEAD:
|
|
return HEAD;
|
|
break;
|
|
case EVHTTP_REQ_PUT:
|
|
return PUT;
|
|
break;
|
|
default:
|
|
return UNKNOWN;
|
|
break;
|
|
}
|
|
}
|
|
|
|
void RegisterHTTPHandler(const std::string &prefix, bool exactMatch, const HTTPRequestHandler &handler)
|
|
{
|
|
logInfo(Log::HTTP) << "Registering HTTP handler for" << prefix << "exactmatch:" << exactMatch;
|
|
pathHandlers.push_back(HTTPPathHandler(prefix, exactMatch, handler));
|
|
}
|
|
|
|
void UnregisterHTTPHandler(const std::string &prefix, bool exactMatch)
|
|
{
|
|
std::vector<HTTPPathHandler>::iterator i = pathHandlers.begin();
|
|
std::vector<HTTPPathHandler>::iterator iend = pathHandlers.end();
|
|
for (; i != iend; ++i)
|
|
if (i->prefix == prefix && i->exactMatch == exactMatch)
|
|
break;
|
|
if (i != iend) {
|
|
logInfo(Log::HTTP) << "Unregistering HTTP handler for" << prefix << "exactmatch:" << exactMatch;
|
|
pathHandlers.erase(i);
|
|
}
|
|
}
|