1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 // 5 // Some socket related helper methods for quic. 6 7 #ifndef NET_TOOLS_QUIC_QUIC_SOCKET_UTILS_H_ 8 #define NET_TOOLS_QUIC_QUIC_SOCKET_UTILS_H_ 9 10 #include <stddef.h> 11 #include <sys/socket.h> 12 #include <string> 13 14 #include "net/base/ip_endpoint.h" 15 #include "net/quic/quic_protocol.h" 16 17 namespace net { 18 namespace tools { 19 20 class QuicSocketUtils { 21 public: 22 // If the msghdr contains IP_PKTINFO or IPV6_PKTINFO, this will return the 23 // IPAddressNumber in that header. Returns an uninitialized IPAddress on 24 // failure. 25 static IPAddressNumber GetAddressFromMsghdr(struct msghdr *hdr); 26 27 // If the msghdr contains an SO_RXQ_OVFL entry, this will set dropped_packets 28 // to the correct value and return true. Otherwise it will return false. 29 static bool GetOverflowFromMsghdr(struct msghdr *hdr, int *dropped_packets); 30 31 // Sets either IP_PKTINFO or IPV6_PKTINFO on the socket, based on 32 // address_family. Returns the return code from setsockopt. 33 static int SetGetAddressInfo(int fd, int address_family); 34 35 // Reads buf_len from the socket. If reading is successful, returns bytes 36 // read and sets peer_address to the peer address. Otherwise returns -1. 37 // 38 // If dropped_packets is non-null, it will be set to the number of packets 39 // dropped on the socket since the socket was created, assuming the kernel 40 // supports this feature. 41 // 42 // If self_address is non-null, it will be set to the address the peer sent 43 // packets to, assuming a packet was read. 44 static int ReadPacket(int fd, char* buffer, size_t buf_len, 45 int* dropped_packets, 46 IPAddressNumber* self_address, 47 IPEndPoint* peer_address); 48 49 // Writes buf_len to the socket. If writing is successful, sets the result's 50 // status to WRITE_STATUS_OK and sets bytes_written. Otherwise sets the 51 // result's status to WRITE_STATUS_BLOCKED or WRITE_STATUS_ERROR and sets 52 // error_code to errno. 53 static WriteResult WritePacket(int fd, const char* buffer, size_t buf_len, 54 const IPAddressNumber& self_address, 55 const IPEndPoint& peer_address); 56 }; 57 58 } // namespace tools 59 } // namespace net 60 61 #endif // NET_TOOLS_QUIC_QUIC_SOCKET_UTILS_H_ 62
