| // 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 <stddef.h> |
| #include <sys/socket.h> |
| #include <string> |
| |
| #include "base/basictypes.h" |
| #include "net/base/ip_endpoint.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, |
| uint32 *dropped_packets); |
| |
| // 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, |
| uint32* 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_ |