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