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// Copyright 2015 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.
#include "net/tools/quic/quic_packet_reader.h"
#include <errno.h>
#ifndef __APPLE__
// This is a GNU header that is not present in /usr/include on MacOS
#include <features.h>
#endif
#include <string.h>
#include <sys/epoll.h>
#include "base/logging.h"
#include "net/base/ip_endpoint.h"
#include "net/quic/quic_flags.h"
#include "net/tools/quic/quic_dispatcher.h"
#include "net/tools/quic/quic_socket_utils.h"
#define MMSG_MORE 0
#ifndef SO_RXQ_OVFL
#define SO_RXQ_OVFL 40
#endif
namespace net {
namespace tools {
QuicPacketReader::QuicPacketReader() {
Initialize();
}
void QuicPacketReader::Initialize() {
// Zero initialize uninitialized memory.
memset(cbuf_, 0, arraysize(cbuf_));
memset(buf_, 0, arraysize(buf_));
memset(raw_address_, 0, sizeof(raw_address_));
memset(mmsg_hdr_, 0, sizeof(mmsg_hdr_));
for (int i = 0; i < kNumPacketsPerReadMmsgCall; ++i) {
iov_[i].iov_base = buf_ + (2 * kMaxPacketSize * i);
iov_[i].iov_len = 2 * kMaxPacketSize;
msghdr* hdr = &mmsg_hdr_[i].msg_hdr;
hdr->msg_name = &raw_address_[i];
hdr->msg_namelen = sizeof(sockaddr_storage);
hdr->msg_iov = &iov_[i];
hdr->msg_iovlen = 1;
hdr->msg_control = cbuf_ + kSpaceForOverflowAndIp * i;
hdr->msg_controllen = kSpaceForOverflowAndIp;
}
}
QuicPacketReader::~QuicPacketReader() {}
bool QuicPacketReader::ReadAndDispatchPackets(
int fd,
int port,
ProcessPacketInterface* processor,
QuicPacketCount* packets_dropped) {
#if MMSG_MORE
// Re-set the length fields in case recvmmsg has changed them.
for (int i = 0; i < kNumPacketsPerReadMmsgCall; ++i) {
iov_[i].iov_len = 2 * kMaxPacketSize;
mmsg_hdr_[i].msg_len = 0;
msghdr* hdr = &mmsg_hdr_[i].msg_hdr;
hdr->msg_namelen = sizeof(sockaddr_storage);
hdr->msg_iovlen = 1;
hdr->msg_controllen = kSpaceForOverflowAndIp;
}
int packets_read =
recvmmsg(fd, mmsg_hdr_, kNumPacketsPerReadMmsgCall, 0, nullptr);
if (packets_read <= 0) {
return false; // recvmmsg failed.
}
for (int i = 0; i < packets_read; ++i) {
if (mmsg_hdr_[i].msg_len == 0) {
continue;
}
IPEndPoint client_address = IPEndPoint(raw_address_[i]);
IPAddressNumber server_ip =
QuicSocketUtils::GetAddressFromMsghdr(&mmsg_hdr_[i].msg_hdr);
if (!IsInitializedAddress(server_ip)) {
LOG(DFATAL) << "Unable to get server address.";
continue;
}
QuicEncryptedPacket packet(reinterpret_cast<char*>(iov_[i].iov_base),
mmsg_hdr_[i].msg_len, false);
IPEndPoint server_address(server_ip, port);
processor->ProcessPacket(server_address, client_address, packet);
}
if (packets_dropped != nullptr) {
QuicSocketUtils::GetOverflowFromMsghdr(&mmsg_hdr_[0].msg_hdr,
packets_dropped);
}
// We may not have read all of the packets available on the socket.
return packets_read == kNumPacketsPerReadMmsgCall;
#else
LOG(FATAL) << "Unsupported";
return false;
#endif
}
/* static */
bool QuicPacketReader::ReadAndDispatchSinglePacket(
int fd,
int port,
ProcessPacketInterface* processor,
QuicPacketCount* packets_dropped) {
// Allocate some extra space so we can send an error if the packet is larger
// than kMaxPacketSize.
char buf[2 * kMaxPacketSize];
IPEndPoint client_address;
IPAddressNumber server_ip;
int bytes_read = QuicSocketUtils::ReadPacket(
fd, buf, arraysize(buf), packets_dropped, &server_ip, &client_address);
if (bytes_read < 0) {
return false; // ReadPacket failed.
}
QuicEncryptedPacket packet(buf, bytes_read, false);
IPEndPoint server_address(server_ip, port);
processor->ProcessPacket(server_address, client_address, packet);
// The socket read was successful, so return true even if packet dispatch
// failed.
return true;
}
} // namespace tools
} // namespace net
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