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/*
* Copyright 2011 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "examples/peerconnection/server/data_socket.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if defined(WEBRTC_POSIX)
#include <unistd.h>
#endif
#include "examples/peerconnection/server/utils.h"
#include "rtc_base/checks.h"
static const char kHeaderTerminator[] = "\r\n\r\n";
static const int kHeaderTerminatorLength = sizeof(kHeaderTerminator) - 1;
// static
const char DataSocket::kCrossOriginAllowHeaders[] =
"Access-Control-Allow-Origin: *\r\n"
"Access-Control-Allow-Credentials: true\r\n"
"Access-Control-Allow-Methods: POST, GET, OPTIONS\r\n"
"Access-Control-Allow-Headers: Content-Type, "
"Content-Length, Connection, Cache-Control\r\n"
"Access-Control-Expose-Headers: Content-Length\r\n";
#if defined(WIN32)
class WinsockInitializer {
static WinsockInitializer singleton;
WinsockInitializer() {
WSADATA data;
WSAStartup(MAKEWORD(1, 0), &data);
}
public:
~WinsockInitializer() { WSACleanup(); }
};
WinsockInitializer WinsockInitializer::singleton;
#endif
//
// SocketBase
//
bool SocketBase::Create() {
RTC_DCHECK(!valid());
socket_ = ::socket(AF_INET, SOCK_STREAM, 0);
return valid();
}
void SocketBase::Close() {
if (socket_ != INVALID_SOCKET) {
closesocket(socket_);
socket_ = INVALID_SOCKET;
}
}
//
// DataSocket
//
std::string DataSocket::request_arguments() const {
size_t args = request_path_.find('?');
if (args != std::string::npos)
return request_path_.substr(args + 1);
return "";
}
bool DataSocket::PathEquals(const char* path) const {
RTC_DCHECK(path);
size_t args = request_path_.find('?');
if (args != std::string::npos)
return request_path_.substr(0, args).compare(path) == 0;
return request_path_.compare(path) == 0;
}
bool DataSocket::OnDataAvailable(bool* close_socket) {
RTC_DCHECK(valid());
char buffer[0xfff] = {0};
int bytes = recv(socket_, buffer, sizeof(buffer), 0);
if (bytes == SOCKET_ERROR || bytes == 0) {
*close_socket = true;
return false;
}
*close_socket = false;
bool ret = true;
if (headers_received()) {
if (method_ != POST) {
// unexpectedly received data.
ret = false;
} else {
data_.append(buffer, bytes);
}
} else {
request_headers_.append(buffer, bytes);
size_t found = request_headers_.find(kHeaderTerminator);
if (found != std::string::npos) {
data_ = request_headers_.substr(found + kHeaderTerminatorLength);
request_headers_.resize(found + kHeaderTerminatorLength);
ret = ParseHeaders();
}
}
return ret;
}
bool DataSocket::Send(const std::string& data) const {
return send(socket_, data.data(), static_cast<int>(data.length()), 0) !=
SOCKET_ERROR;
}
bool DataSocket::Send(const std::string& status,
bool connection_close,
const std::string& content_type,
const std::string& extra_headers,
const std::string& data) const {
RTC_DCHECK(valid());
RTC_DCHECK(!status.empty());
std::string buffer("HTTP/1.1 " + status + "\r\n");
buffer +=
"Server: PeerConnectionTestServer/0.1\r\n"
"Cache-Control: no-cache\r\n";
if (connection_close)
buffer += "Connection: close\r\n";
if (!content_type.empty())
buffer += "Content-Type: " + content_type + "\r\n";
buffer +=
"Content-Length: " + int2str(static_cast<int>(data.size())) + "\r\n";
if (!extra_headers.empty()) {
buffer += extra_headers;
// Extra headers are assumed to have a separator per header.
}
buffer += kCrossOriginAllowHeaders;
buffer += "\r\n";
buffer += data;
return Send(buffer);
}
void DataSocket::Clear() {
method_ = INVALID;
content_length_ = 0;
content_type_.clear();
request_path_.clear();
request_headers_.clear();
data_.clear();
}
bool DataSocket::ParseHeaders() {
RTC_DCHECK(!request_headers_.empty());
RTC_DCHECK_EQ(method_, INVALID);
size_t i = request_headers_.find("\r\n");
if (i == std::string::npos)
return false;
if (!ParseMethodAndPath(request_headers_.data(), i))
return false;
RTC_DCHECK_NE(method_, INVALID);
RTC_DCHECK(!request_path_.empty());
if (method_ == POST) {
const char* headers = request_headers_.data() + i + 2;
size_t len = request_headers_.length() - i - 2;
if (!ParseContentLengthAndType(headers, len))
return false;
}
return true;
}
bool DataSocket::ParseMethodAndPath(const char* begin, size_t len) {
struct {
const char* method_name;
size_t method_name_len;
RequestMethod id;
} supported_methods[] = {
{"GET", 3, GET},
{"POST", 4, POST},
{"OPTIONS", 7, OPTIONS},
};
const char* path = NULL;
for (size_t i = 0; i < ARRAYSIZE(supported_methods); ++i) {
if (len > supported_methods[i].method_name_len &&
isspace(begin[supported_methods[i].method_name_len]) &&
strncmp(begin, supported_methods[i].method_name,
supported_methods[i].method_name_len) == 0) {
method_ = supported_methods[i].id;
path = begin + supported_methods[i].method_name_len;
break;
}
}
const char* end = begin + len;
if (!path || path >= end)
return false;
++path;
begin = path;
while (!isspace(*path) && path < end)
++path;
request_path_.assign(begin, path - begin);
return true;
}
bool DataSocket::ParseContentLengthAndType(const char* headers, size_t length) {
RTC_DCHECK_EQ(content_length_, 0);
RTC_DCHECK(content_type_.empty());
const char* end = headers + length;
while (headers && headers < end) {
if (!isspace(headers[0])) {
static const char kContentLength[] = "Content-Length:";
static const char kContentType[] = "Content-Type:";
if ((headers + ARRAYSIZE(kContentLength)) < end &&
strncmp(headers, kContentLength, ARRAYSIZE(kContentLength) - 1) ==
0) {
headers += ARRAYSIZE(kContentLength) - 1;
while (headers[0] == ' ')
++headers;
content_length_ = atoi(headers);
} else if ((headers + ARRAYSIZE(kContentType)) < end &&
strncmp(headers, kContentType, ARRAYSIZE(kContentType) - 1) ==
0) {
headers += ARRAYSIZE(kContentType) - 1;
while (headers[0] == ' ')
++headers;
const char* type_end = strstr(headers, "\r\n");
if (type_end == NULL)
type_end = end;
content_type_.assign(headers, type_end);
}
} else {
++headers;
}
headers = strstr(headers, "\r\n");
if (headers)
headers += 2;
}
return !content_type_.empty() && content_length_ != 0;
}
//
// ListeningSocket
//
bool ListeningSocket::Listen(unsigned short port) {
RTC_DCHECK(valid());
int enabled = 1;
if (setsockopt(socket_, SOL_SOCKET, SO_REUSEADDR,
reinterpret_cast<const char*>(&enabled),
sizeof(enabled)) != 0) {
printf("setsockopt failed\n");
return false;
}
struct sockaddr_in addr = {0};
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(INADDR_ANY);
addr.sin_port = htons(port);
if (bind(socket_, reinterpret_cast<const sockaddr*>(&addr), sizeof(addr)) ==
SOCKET_ERROR) {
printf("bind failed\n");
return false;
}
return listen(socket_, 5) != SOCKET_ERROR;
}
DataSocket* ListeningSocket::Accept() const {
RTC_DCHECK(valid());
struct sockaddr_in addr = {0};
socklen_t size = sizeof(addr);
NativeSocket client =
accept(socket_, reinterpret_cast<sockaddr*>(&addr), &size);
if (client == INVALID_SOCKET)
return NULL;
return new DataSocket(client);
}