223 lines
6 KiB
C++
223 lines
6 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#define FORBIDDEN_SYMBOL_ALLOW_ALL
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#include "backends/networking/sdl_net/client.h"
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#include "backends/networking/sdl_net/localwebserver.h"
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#include "common/textconsole.h"
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#include <SDL/SDL_net.h>
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namespace Networking {
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Client::Client() : _state(INVALID), _set(nullptr), _socket(nullptr), _handler(nullptr) {}
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Client::Client(SDLNet_SocketSet set, TCPsocket socket) : _state(INVALID), _set(nullptr), _socket(nullptr), _handler(nullptr) {
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open(set, socket);
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}
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Client::~Client() {
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close();
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}
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void Client::open(SDLNet_SocketSet set, TCPsocket socket) {
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if (_state != INVALID) close();
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_state = READING_HEADERS;
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_socket = socket;
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_set = set;
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_headers = "";
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_method = "";
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_path = "";
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_query = "";
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_anchor = "";
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_handler = nullptr;
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if (set) {
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int numused = SDLNet_TCP_AddSocket(set, socket);
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if (numused == -1) {
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error("SDLNet_AddSocket: %s\n", SDLNet_GetError());
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}
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}
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}
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void Client::readHeaders() {
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if (!_socket) return;
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if (!SDLNet_SocketReady(_socket)) return;
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const uint32 BUFFER_SIZE = 16 * 1024;
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char buffer[BUFFER_SIZE];
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int bytes = SDLNet_TCP_Recv(_socket, buffer, BUFFER_SIZE);
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if (bytes <= 0) {
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warning("Client::readHeaders recv fail");
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close();
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return;
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}
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_headers += Common::String(buffer, bytes);
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checkIfHeadersEnded();
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checkIfBadRequest();
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}
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void Client::checkIfHeadersEnded() {
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const char *cstr = _headers.c_str();
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const char *position = strstr(cstr, "\r\n\r\n");
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if (position) _state = READ_HEADERS;
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}
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void Client::checkIfBadRequest() {
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uint32 headersSize = _headers.size();
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bool bad = false;
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const uint32 SUSPICIOUS_HEADERS_SIZE = 128 * 1024;
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if (headersSize > SUSPICIOUS_HEADERS_SIZE) bad = true;
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if (!bad) {
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if (headersSize > 0) {
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const char *cstr = _headers.c_str();
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const char *position = strstr(cstr, "\r\n");
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if (position) { //we have at least one line - and we want the first one
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//"<METHOD> <path> HTTP/<VERSION>\r\n"
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Common::String method, path, http, buf;
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uint32 length = position - cstr;
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if (headersSize > length) headersSize = length;
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for (uint32 i = 0; i < headersSize; ++i) {
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if (_headers[i] != ' ') buf += _headers[i];
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if (_headers[i] == ' ' || i == headersSize - 1) {
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if (method == "") method = buf;
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else if (path == "") path = buf;
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else if (http == "") http = buf;
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else {
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bad = true;
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break;
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}
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buf = "";
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}
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}
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//check that method is supported
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if (method != "GET" && method != "PUT" && method != "POST") bad = true;
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//check that HTTP/<VERSION> is OK
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if (!http.hasPrefix("HTTP/")) bad = true;
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_method = method;
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parsePathQueryAndAnchor(path);
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}
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}
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}
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if (bad) _state = BAD_REQUEST;
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}
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void Client::parsePathQueryAndAnchor(Common::String path) {
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//<path>[?query][#anchor]
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bool readingPath = true;
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bool readingQuery = false;
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_path = "";
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_query = "";
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_anchor = "";
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for (uint32 i = 0; i < path.size(); ++i) {
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if (readingPath) {
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if (path[i] == '?') {
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readingPath = false;
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readingQuery = true;
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} else _path += path[i];
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} else if(readingQuery) {
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if (path[i] == '#') {
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readingQuery = false;
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} else _query += path[i];
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} else _anchor += path[i];
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}
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}
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void Client::setHandler(ClientHandler *handler) {
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if (_handler) delete _handler;
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_state = BEING_HANDLED;
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_handler = handler;
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}
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void Client::handle() {
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if (_state != BEING_HANDLED) warning("handle() called in a wrong Client's state");
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if (!_handler) warning("Client doesn't have handler to be handled by");
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if (_handler) _handler->handle(this);
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}
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void Client::close() {
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if (_set) {
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if (_socket) {
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int numused = SDLNet_TCP_DelSocket(_set, _socket);
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if (numused == -1)
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error("SDLNet_DelSocket: %s\n", SDLNet_GetError());
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}
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_set = nullptr;
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}
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if (_socket) {
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SDLNet_TCP_Close(_socket);
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_socket = nullptr;
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}
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_state = INVALID;
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}
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ClientState Client::state() const { return _state; }
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Common::String Client::headers() const { return _headers; }
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Common::String Client::method() const { return _method; }
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Common::String Client::path() const { return _path; }
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Common::String Client::query() const { return _query; }
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Common::String Client::queryParameter(Common::String name) const {
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// this approach is a bit slower than searching for the <name>
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// yet I believe it to be the right one, because we probably can have "<name>=" in the value of other key
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Common::String key = "";
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Common::String value = "";
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bool readingKey = true;
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for (uint32 i = 0; i < _query.size(); ++i) {
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if (readingKey) {
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if (_query[i] == '=') {
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readingKey = false;
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value = "";
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} else key += _query[i];
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} else {
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if (_query[i] == '&') {
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if (key == name) return LocalWebserver::urlDecode(value);
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readingKey = true;
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key = "";
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} else value += _query[i];
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}
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}
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if (key == name) return LocalWebserver::urlDecode(value); //the last key doesn't have an '&' in the end of the query
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return "";
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}
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Common::String Client::anchor() const { return _anchor; }
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bool Client::socketIsReady() { return SDLNet_SocketReady(_socket); }
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int Client::recv(void *data, int maxlen) { return SDLNet_TCP_Recv(_socket, data, maxlen); }
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int Client::send(void *data, int len) { return SDLNet_TCP_Send(_socket, data, len); }
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} // End of namespace Networking
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