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/**
* @file
* @author 2012-2013 Stefan Radomski (stefan.radomski@cs.tu-darmstadt.de)
* @copyright Simplified BSD
*
* @cond
* This program is free software: you can redistribute it and/or modify
* it under the terms of the FreeBSD license as published by the FreeBSD
* project.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received a copy of the FreeBSD license along with this
* program. If not, see <http://www.opensource.org/licenses/bsd-license>.
* @endcond
*/
#include "uscxml/config.h"
#ifdef _WIN32
#include <winsock2.h>
#include <windows.h>
#endif
#include "uscxml/server/HTTPServer.h"
#include <string>
#include <iostream>
extern "C" {
#include <event2/dns.h>
#include <event2/event.h>
#include <event2/buffer.h>
#include <event2/keyvalq_struct.h>
#include <event2/http_struct.h>
#include <event2/thread.h>
}
#include <glog/logging.h>
#include <boost/algorithm/string.hpp>
#ifndef _WIN32
#include <netinet/in.h> // for INADDR_ANY
#include <stdint.h> // for uint16_t
#include <stdlib.h> // for NULL, free
#include <unistd.h> // for gethostname
//#include <netdb.h>
//#include <arpa/inet.h>
#endif
#if (defined EVENT_SSL_FOUND && defined OPENSSL_FOUND && defined OPENSSL_HAS_ELIPTIC_CURVES)
#include <openssl/ssl.h>
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/pem.h>
#include <event2/bufferevent_ssl.h>
#endif
#include "uscxml/Message.h"
#include "uscxml/Convenience.h" // for toStr
#ifdef BUILD_AS_PLUGINS
#include <Pluma/Connector.hpp>
#endif
namespace uscxml {
HTTPServer::HTTPServer(unsigned short port, SSLConfig* sslConf) {
_port = port;
_base = event_base_new();
_http = evhttp_new(_base);
_thread = NULL;
unsigned int allowedMethods =
EVHTTP_REQ_GET |
EVHTTP_REQ_POST |
EVHTTP_REQ_HEAD |
EVHTTP_REQ_PUT |
EVHTTP_REQ_DELETE |
EVHTTP_REQ_OPTIONS |
EVHTTP_REQ_TRACE |
EVHTTP_REQ_CONNECT |
EVHTTP_REQ_PATCH;
evhttp_set_allowed_methods(_http, allowedMethods); // allow all methods
_handle = NULL;
while((_handle = evhttp_bind_socket_with_handle(_http, INADDR_ANY, _port)) == NULL) {
_port++;
}
determineAddress();
#if (defined EVENT_SSL_FOUND && defined OPENSSL_FOUND && defined OPENSSL_HAS_ELIPTIC_CURVES)
if (!sslConf) {
_https = NULL;
_sslHandle = NULL;
_sslPort = 0;
} else {
_sslPort = sslConf->port;
// Initialize OpenSSL
SSL_library_init();
ERR_load_crypto_strings();
SSL_load_error_strings();
OpenSSL_add_all_algorithms();
_https = evhttp_new(_base);
evhttp_set_allowed_methods(_https, allowedMethods); // allow all methods
SSL_CTX* ctx = SSL_CTX_new (SSLv23_server_method ());
SSL_CTX_set_options(ctx,
SSL_OP_SINGLE_DH_USE |
SSL_OP_SINGLE_ECDH_USE |
SSL_OP_NO_SSLv2);
EC_KEY* ecdh = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
SSL_CTX_set_tmp_ecdh (ctx, ecdh);
SSL_CTX_use_certificate_chain_file(ctx, sslConf->publicKey.c_str());
SSL_CTX_use_PrivateKey_file(ctx, sslConf->privateKey.c_str(), SSL_FILETYPE_PEM);
SSL_CTX_check_private_key(ctx);
evhttp_set_bevcb(_https, sslBufferEventCallback, ctx);
evhttp_set_gencb(_https, sslGeneralBufferEventCallback, NULL);
_sslHandle = NULL;
while((_sslHandle = evhttp_bind_socket_with_handle(_https, INADDR_ANY, _sslPort)) == NULL) {
_sslPort++;
}
}
#endif
// evhttp_set_timeout(_http, 5);
// generic callback
evhttp_set_gencb(_http, HTTPServer::httpRecvReqCallback, NULL);
}
HTTPServer::~HTTPServer() {
_isRunning = false;
_thread->join();
delete _thread;
}
HTTPServer* HTTPServer::_instance = NULL;
tthread::recursive_mutex HTTPServer::_instanceMutex;
HTTPServer* HTTPServer::getInstance(unsigned short port, SSLConfig* sslConf) {
// tthread::lock_guard<tthread::recursive_mutex> lock(_instanceMutex);
if (_instance == NULL) {
#ifdef _WIN32
WSADATA wsaData;
WSAStartup(MAKEWORD(2, 2), &wsaData);
#endif
#ifndef _WIN32
evthread_use_pthreads();
#else
evthread_use_windows_threads();
#endif
_instance = new HTTPServer(port, sslConf);
_instance->start();
}
return _instance;
}
#if (defined EVENT_SSL_FOUND && defined OPENSSL_FOUND && defined OPENSSL_HAS_ELIPTIC_CURVES)
// see https://github.com/ppelleti/https-example/blob/master/https-server.c
struct bufferevent* HTTPServer::sslBufferEventCallback(struct event_base *base, void *arg) {
struct bufferevent* r;
SSL_CTX *ctx = (SSL_CTX *) arg;
r = bufferevent_openssl_socket_new (base,
-1,
SSL_new (ctx),
BUFFEREVENT_SSL_ACCEPTING,
BEV_OPT_CLOSE_ON_FREE);
return r;
}
void HTTPServer::sslGeneralBufferEventCallback (struct evhttp_request *req, void *arg) {
struct evbuffer *evb = NULL;
const char *uri = evhttp_request_get_uri (req);
struct evhttp_uri *decoded = NULL;
/* We only handle POST requests. */
if (evhttp_request_get_command (req) != EVHTTP_REQ_POST) {
evhttp_send_reply (req, 200, "OK", NULL);
return;
}
printf ("Got a POST request for <%s>\n", uri);
/* Decode the URI */
decoded = evhttp_uri_parse (uri);
if (! decoded) {
printf ("It's not a good URI. Sending BADREQUEST\n");
evhttp_send_error (req, HTTP_BADREQUEST, 0);
return;
}
/* Decode the payload */
struct evkeyvalq kv;
memset (&kv, 0, sizeof (kv));
struct evbuffer *buf = evhttp_request_get_input_buffer (req);
evbuffer_add (buf, "", 1); /* NUL-terminate the buffer */
char *payload = (char *) evbuffer_pullup (buf, -1);
if (0 != evhttp_parse_query_str (payload, &kv)) {
printf ("Malformed payload. Sending BADREQUEST\n");
evhttp_send_error (req, HTTP_BADREQUEST, 0);
return;
}
/* Determine peer */
char *peer_addr;
ev_uint16_t peer_port;
struct evhttp_connection *con = evhttp_request_get_connection (req);
evhttp_connection_get_peer (con, &peer_addr, &peer_port);
/* Extract passcode */
const char *passcode = evhttp_find_header (&kv, "passcode");
char response[256];
evutil_snprintf (response, sizeof (response),
"Hi %s! I %s your passcode.\n", peer_addr,
(0 == strcmp (passcode, "R23")
? "liked"
: "didn't like"));
evhttp_clear_headers (&kv); /* to free memory held by kv */
/* This holds the content we're sending. */
evb = evbuffer_new ();
evhttp_add_header (evhttp_request_get_output_headers (req),
"Content-Type", "application/x-yaml");
evbuffer_add (evb, response, strlen (response));
evhttp_send_reply (req, 200, "OK", evb);
if (decoded)
evhttp_uri_free (decoded);
if (evb)
evbuffer_free (evb);
}
#endif
/**
* This callback is registered for all HTTP requests
*/
void HTTPServer::httpRecvReqCallback(struct evhttp_request *req, void *callbackData) {
std::stringstream raw;
evhttp_request_own(req);
Request request;
request.curlReq = req;
switch (evhttp_request_get_command(req)) {
case EVHTTP_REQ_GET:
request.data.compound["type"] = Data("get", Data::VERBATIM);
break;
case EVHTTP_REQ_POST:
request.data.compound["type"] = Data("post", Data::VERBATIM);
break;
case EVHTTP_REQ_HEAD:
request.data.compound["type"] = Data("head", Data::VERBATIM);
break;
case EVHTTP_REQ_PUT:
request.data.compound["type"] = Data("put", Data::VERBATIM);
break;
case EVHTTP_REQ_DELETE:
request.data.compound["type"] = Data("delete", Data::VERBATIM);
break;
case EVHTTP_REQ_OPTIONS:
request.data.compound["type"] = Data("options", Data::VERBATIM);
break;
case EVHTTP_REQ_TRACE:
request.data.compound["type"] = Data("trace", Data::VERBATIM);
break;
case EVHTTP_REQ_CONNECT:
request.data.compound["type"] = Data("connect", Data::VERBATIM);
break;
case EVHTTP_REQ_PATCH:
request.data.compound["type"] = Data("patch", Data::VERBATIM);
break;
default:
request.data.compound["type"] = Data("unknown", Data::VERBATIM);
break;
}
raw << boost::to_upper_copy(request.data.compound["type"].atom);
request.data.compound["remoteHost"] = Data(req->remote_host, Data::VERBATIM);
request.data.compound["remotePort"] = Data(toStr(req->remote_port), Data::VERBATIM);
request.data.compound["httpMajor"] = Data(toStr((unsigned short)req->major), Data::VERBATIM);
request.data.compound["httpMinor"] = Data(toStr((unsigned short)req->minor), Data::VERBATIM);
request.data.compound["uri"] = Data(HTTPServer::getBaseURL() + req->uri, Data::VERBATIM);
char* pathCStr = evhttp_decode_uri(evhttp_uri_get_path(evhttp_request_get_evhttp_uri(req)));
request.data.compound["path"] = Data(pathCStr, Data::VERBATIM);
free(pathCStr);
raw << " " << request.data.compound["path"].atom;
const char* query = evhttp_uri_get_query(evhttp_request_get_evhttp_uri(req));
if (query)
raw << "?" << std::string(query);
raw << " HTTP/" << request.data.compound["httpMajor"].atom << "." << request.data.compound["httpMinor"].atom;
raw << std::endl;
struct evkeyvalq *headers;
struct evkeyval *header;
struct evbuffer *buf;
// insert headers to event data
headers = evhttp_request_get_input_headers(req);
for (header = headers->tqh_first; header; header = header->next.tqe_next) {
request.data.compound["header"].compound[header->key] = Data(header->value, Data::VERBATIM);
raw << header->key << ": " << header->value << std::endl;
}
raw << std::endl;
// This was used for debugging
// if (boost::ends_with(request.data.compound["path"].atom, ".png")) {
// evhttp_send_error(req, 404, NULL);
// return;
// }
// seperate path into components
{
std::stringstream ss(request.data.compound["path"].atom);
std::string item;
while(std::getline(ss, item, '/')) {
if (item.length() == 0)
continue;
request.data.compound["pathComponent"].array.push_back(Data(item, Data::VERBATIM));
}
}
// parse query string
struct evkeyvalq params;
struct evkeyval *param;
evhttp_parse_query_str(query, ¶ms);
for (param = params.tqh_first; param; param = param->next.tqe_next) {
request.data.compound["query"].compound[param->key] = Data(param->value, Data::VERBATIM);
}
evhttp_clear_headers(¶ms);
// get content
buf = evhttp_request_get_input_buffer(req);
if (evbuffer_get_length(buf))
request.data.compound["content"] = Data("", Data::VERBATIM);
while (evbuffer_get_length(buf)) {
int n;
char cbuf[1024];
n = evbuffer_remove(buf, cbuf, sizeof(buf)-1);
if (n > 0) {
request.data.compound["content"].atom.append(cbuf, n);
}
}
raw << request.data.compound["content"].atom;
// decode content
if (request.data.compound.find("content") != request.data.compound.end() &&
request.data.compound["header"].compound.find("Content-Type") != request.data.compound["header"].compound.end()) {
std::string contentType = request.data.compound["header"].compound["Content-Type"].atom;
if (false) {
} else if (iequals(contentType, "application/x-www-form-urlencoded")) {
// this is a form submit
std::stringstream ss(request.data.compound["content"].atom);
std::string item;
std::string key;
std::string value;
while(std::getline(ss, item, '&')) {
if (item.length() == 0)
continue;
size_t equalPos = item.find('=');
if (equalPos == std::string::npos)
continue;
key = item.substr(0, equalPos);
value = item.substr(equalPos + 1, item.length() - (equalPos + 1));
char* keyCStr = evhttp_decode_uri(key.c_str());
char* valueCStr = evhttp_decode_uri(value.c_str());
request.data.compound["content"].compound[keyCStr] = Data(valueCStr, Data::VERBATIM);
free(keyCStr);
free(valueCStr);
key.clear();
}
request.data.compound["content"].atom.clear();
} else if (iequals(contentType, "application/json")) {
request.data.compound["content"] = Data::fromJSON(request.data.compound["content"].atom);
}
}
request.raw = raw.str();
// try with the handler registered for path first
bool answered = false;
if (callbackData != NULL)
answered = ((HTTPServlet*)callbackData)->httpRecvRequest(request);
if (!answered)
HTTPServer::getInstance()->processByMatchingServlet(request);
}
void HTTPServer::processByMatchingServlet(const Request& request) {
tthread::lock_guard<tthread::recursive_mutex> lock(_mutex);
servlet_iter_t servletIter = _servlets.begin();
std::string actualPath = request.data.compound.at("path").atom;
std::map<std::string, HTTPServlet*, comp_strsize_less> matches;
while(servletIter != _servlets.end()) {
// is the servlet path a prefix of the actual path?
std::string servletPath = "/" + servletIter->first;
if (iequals(actualPath.substr(0, servletPath.length()), servletPath) && // actual path is a prefix
iequals(actualPath.substr(servletPath.length(), 1), "/")) { // and next character is a '/'
matches.insert(std::make_pair(servletPath, servletIter->second));
}
servletIter++;
}
// process by best matching servlet until someone feels responsible
std::map<std::string, HTTPServlet*, comp_strsize_less>::iterator matchesIter = matches.begin();
while(matchesIter != matches.end()) {
if (matchesIter->second->httpRecvRequest(request)) {
return;
}
matchesIter++;
}
LOG(INFO) << "Got an HTTP request at " << actualPath << " but no servlet is registered there or at a prefix";
evhttp_send_error(request.curlReq, 404, NULL);
}
void HTTPServer::reply(const Reply& reply) {
// we need to reply from the thread calling event_base_dispatch, just add to ist base queue!
Reply* replyCB = new Reply(reply);
HTTPServer* INSTANCE = getInstance();
event_base_once(INSTANCE->_base, -1, EV_TIMEOUT, HTTPServer::replyCallback, replyCB, NULL);
}
void HTTPServer::replyCallback(evutil_socket_t fd, short what, void *arg) {
Reply* reply = (Reply*)arg;
if (reply->content.size() > 0 && reply->headers.find("Content-Type") == reply->headers.end()) {
LOG(INFO) << "Sending content without Content-Type header";
}
std::map<std::string, std::string>::const_iterator headerIter = reply->headers.begin();
while(headerIter != reply->headers.end()) {
evhttp_add_header(evhttp_request_get_output_headers(reply->curlReq), headerIter->first.c_str(), headerIter->second.c_str());
headerIter++;
}
if (reply->status >= 400) {
evhttp_send_error(reply->curlReq, reply->status, NULL);
return;
}
struct evbuffer *evb = NULL;
if (!iequals(reply->type, "HEAD") && reply->content.size() > 0) {
evb = evbuffer_new();
evbuffer_add(evb, reply->content.data(), reply->content.size());
}
evhttp_send_reply(reply->curlReq, reply->status, NULL, evb);
if (evb != NULL)
evbuffer_free(evb);
// evhttp_request_free(reply->curlReq);
delete(reply);
}
bool HTTPServer::registerServlet(const std::string& path, HTTPServlet* servlet) {
HTTPServer* INSTANCE = getInstance();
tthread::lock_guard<tthread::recursive_mutex> lock(INSTANCE->_mutex);
// remove trailing and leading slash
std::string actualPath = path;
if (boost::ends_with(actualPath, "/"))
actualPath = actualPath.substr(0, actualPath.size() - 1);
if (boost::starts_with(actualPath, "/"))
actualPath = actualPath.substr(1);
std::string suffixedPath = actualPath;
// if this servlet allows to adapt the path, do so
int i = 2;
while(INSTANCE->_servlets.find(suffixedPath) != INSTANCE->_servlets.end()) {
if (!servlet->canAdaptPath())
return false;
std::stringstream ss;
ss << actualPath << i++;
suffixedPath = ss.str();
}
std::stringstream servletURL;
servletURL << "http://" << INSTANCE->_address << ":" << INSTANCE->_port << "/" << suffixedPath;
servlet->setURL(servletURL.str());
INSTANCE->_servlets[suffixedPath] = servlet;
// LOG(INFO) << "HTTP Servlet listening at: " << servletURL.str() << std::endl;
// register callback
evhttp_set_cb(INSTANCE->_http, ("/" + suffixedPath).c_str(), HTTPServer::httpRecvReqCallback, servlet);
return true;
}
std::string HTTPServer::getBaseURL() {
HTTPServer* INSTANCE = getInstance();
std::stringstream servletURL;
servletURL << "http://" << INSTANCE->_address << ":" << INSTANCE->_port;
return servletURL.str();
}
void HTTPServer::unregisterServlet(HTTPServlet* servlet) {
HTTPServer* INSTANCE = getInstance();
tthread::lock_guard<tthread::recursive_mutex> lock(INSTANCE->_mutex);
servlet_iter_t servletIter = INSTANCE->_servlets.begin();
while(servletIter != INSTANCE->_servlets.end()) {
if (servletIter->second == servlet) {
evhttp_del_cb(INSTANCE->_http, std::string("/" + servletIter->first).c_str());
INSTANCE->_servlets.erase(servletIter);
break;
}
servletIter++;
}
}
void HTTPServer::start() {
_isRunning = true;
_thread = new tthread::thread(HTTPServer::run, this);
}
void HTTPServer::run(void* instance) {
HTTPServer* INSTANCE = (HTTPServer*)instance;
while(INSTANCE->_isRunning) {
event_base_dispatch(INSTANCE->_base);
}
LOG(INFO) << "HTTP Server stopped" << std::endl;
}
void HTTPServer::determineAddress() {
char hostname[1024];
gethostname(hostname, 1024);
_address = std::string(hostname);
}
}
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