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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// Some socket related helper methods for quic.
#ifndef NET_TOOLS_QUIC_QUIC_SOCKET_UTILS_H_
#define NET_TOOLS_QUIC_QUIC_SOCKET_UTILS_H_
#include <fcntl.h>
#include <stddef.h>
#include <sys/socket.h>
#include <string>
#include "base/basictypes.h"
#include "net/base/ip_endpoint.h"
#include "net/quic/quic_bandwidth.h"
#include "net/quic/quic_types.h"
namespace net {
namespace tools {
class QuicSocketUtils {
public:
// If the msghdr contains IP_PKTINFO or IPV6_PKTINFO, this will return the
// IPAddressNumber in that header. Returns an uninitialized IPAddress on
// failure.
static IPAddressNumber GetAddressFromMsghdr(struct msghdr* hdr);
// If the msghdr contains an SO_RXQ_OVFL entry, this will set dropped_packets
// to the correct value and return true. Otherwise it will return false.
static bool GetOverflowFromMsghdr(struct msghdr* hdr,
QuicPacketCount* dropped_packets);
// Compatibility wrapper for systems that do not support SOCK_NONBLOCK as
// a creation option, so resort to fcntl(). Also logs an error on failure.
static int CreateNonBlockingSocket(int domain, int type, int protocol);
// Sets either IP_PKTINFO or IPV6_PKTINFO on the socket, based on
// address_family. Returns the return code from setsockopt.
static int SetGetAddressInfo(int fd, int address_family);
// Sets the send buffer size to |size| and returns false if it fails.
static bool SetSendBufferSize(int fd, size_t size);
// Sets the receive buffer size to |size| and returns false if it fails.
static bool SetReceiveBufferSize(int fd, size_t size);
// Reads buf_len from the socket. If reading is successful, returns bytes
// read and sets peer_address to the peer address. Otherwise returns -1.
//
// If dropped_packets is non-null, it will be set to the number of packets
// dropped on the socket since the socket was created, assuming the kernel
// supports this feature.
//
// If self_address is non-null, it will be set to the address the peer sent
// packets to, assuming a packet was read.
static int ReadPacket(int fd,
char* buffer,
size_t buf_len,
QuicPacketCount* dropped_packets,
IPAddressNumber* self_address,
IPEndPoint* peer_address);
// Writes buf_len to the socket. If writing is successful, sets the result's
// status to WRITE_STATUS_OK and sets bytes_written. Otherwise sets the
// result's status to WRITE_STATUS_BLOCKED or WRITE_STATUS_ERROR and sets
// error_code to errno.
static WriteResult WritePacket(int fd,
const char* buffer,
size_t buf_len,
const IPAddressNumber& self_address,
const IPEndPoint& peer_address);
// A helper for WritePacket which fills in the cmsg with the supplied self
// address.
// Returns the length of the packet info structure used.
static size_t SetIpInfoInCmsg(const IPAddressNumber& self_address,
cmsghdr* cmsg);
private:
DISALLOW_COPY_AND_ASSIGN(QuicSocketUtils);
};
} // namespace tools
} // namespace net
#endif // NET_TOOLS_QUIC_QUIC_SOCKET_UTILS_H_
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