net/tools/quic/quic_socket_utils.h

   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
  16 namespace net {
  17 namespace tools {
  18
  19 class QuicSocketUtils {
  20  public:
  21   // If the msghdr contains IP_PKTINFO or IPV6_PKTINFO, this will return the
  22   // IPAddressNumber in that header.  Returns an uninitialized IPAddress on
  23   // failure.
  24   static IPAddressNumber GetAddressFromMsghdr(struct msghdr *hdr);
  25
  26   // If the msghdr contains an SO_RXQ_OVFL entry, this will set dropped_packets
  27   // to the correct value and return true. Otherwise it will return false.
  28   static bool GetOverflowFromMsghdr(struct msghdr *hdr, int *dropped_packets);
  29
  30   // Sets either IP_PKTINFO or IPV6_PKTINFO on the socket, based on
  31   // address_family.  Returns the return code from setsockopt.
  32   static int SetGetAddressInfo(int fd, int address_family);
  33
  34   // Reads buf_len from the socket.  If reading is successful, returns bytes
  35   // read and sets peer_address to the peer address.  Otherwise returns -1.
  36   //
  37   // If dropped_packets is non-null, it will be set to the number of packets
  38   // dropped on the socket since the socket was created, assuming the kernel
  39   // supports this feature.
  40   //
  41   // If self_address is non-null, it will be set to the address the peer sent
  42   // packets to, assuming a packet was read.
  43   static int ReadPacket(int fd, char* buffer, size_t buf_len,
  44                         int* dropped_packets,
  45                         IPAddressNumber* self_address,
  46                         IPEndPoint* peer_address);
  47
  48   // Writes buf_len to the socket. If writing is successful returns the number
  49   // of bytes written otherwise returns -1 and sets error to errno.
  50   static int WritePacket(int fd, const char* buffer, size_t buf_len,
  51                          const IPAddressNumber& self_address,
  52                          const IPEndPoint& peer_address,
  53                          int* error);
  54 };
  55
  56 }  // namespace tools
  57 }  // namespace net
  58
  59 #endif  // NET_TOOLS_QUIC_QUIC_SOCKET_UTILS_H_