diff options
Diffstat (limited to 'chromium/net/dns/host_resolver_proc.cc')
| -rw-r--r-- | chromium/net/dns/host_resolver_proc.cc | 170 |
1 files changed, 5 insertions, 165 deletions
diff --git a/chromium/net/dns/host_resolver_proc.cc b/chromium/net/dns/host_resolver_proc.cc index 08c0105989f..7f1734ae84a 100644 --- a/chromium/net/dns/host_resolver_proc.cc +++ b/chromium/net/dns/host_resolver_proc.cc @@ -1,4 +1,4 @@ -// Copyright (c) 2012 The Chromium Authors. All rights reserved. +// Copyright 2012 The Chromium Authors // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. @@ -6,18 +6,14 @@ #include <tuple> -#include "build/build_config.h" - #include "base/check.h" -#include "base/threading/scoped_blocking_call.h" +#include "base/memory/scoped_refptr.h" +#include "base/notreached.h" +#include "build/build_config.h" #include "net/base/address_family.h" #include "net/base/address_list.h" #include "net/base/net_errors.h" -#include "net/base/sys_addrinfo.h" -#include "net/dns/address_info.h" -#include "net/dns/dns_reloader.h" -#include "net/dns/dns_util.h" -#include "net/dns/host_resolver.h" +#include "net/dns/host_resolver_system_task.h" #if BUILDFLAG(IS_OPENBSD) #define AI_ADDRCONFIG 0 @@ -110,160 +106,4 @@ HostResolverProc* HostResolverProc::GetDefault() { return default_proc_; } -namespace { - -int AddressFamilyToAF(AddressFamily address_family) { - switch (address_family) { - case ADDRESS_FAMILY_IPV4: - return AF_INET; - case ADDRESS_FAMILY_IPV6: - return AF_INET6; - case ADDRESS_FAMILY_UNSPECIFIED: - return AF_UNSPEC; - } -} - -} // namespace - -int SystemHostResolverCall(const std::string& host, - AddressFamily address_family, - HostResolverFlags host_resolver_flags, - AddressList* addrlist, - int* os_error_opt, - handles::NetworkHandle network) { - // |host| should be a valid domain name. HostResolverImpl::Resolve has checks - // to fail early if this is not the case. - DCHECK(IsValidDNSDomain(host)); - - struct addrinfo hints = {0}; - hints.ai_family = AddressFamilyToAF(address_family); - -#if BUILDFLAG(IS_WIN) - // DO NOT USE AI_ADDRCONFIG ON WINDOWS. - // - // The following comment in <winsock2.h> is the best documentation I found - // on AI_ADDRCONFIG for Windows: - // Flags used in "hints" argument to getaddrinfo() - // - AI_ADDRCONFIG is supported starting with Vista - // - default is AI_ADDRCONFIG ON whether the flag is set or not - // because the performance penalty in not having ADDRCONFIG in - // the multi-protocol stack environment is severe; - // this defaulting may be disabled by specifying the AI_ALL flag, - // in that case AI_ADDRCONFIG must be EXPLICITLY specified to - // enable ADDRCONFIG behavior - // - // Not only is AI_ADDRCONFIG unnecessary, but it can be harmful. If the - // computer is not connected to a network, AI_ADDRCONFIG causes getaddrinfo - // to fail with WSANO_DATA (11004) for "localhost", probably because of the - // following note on AI_ADDRCONFIG in the MSDN getaddrinfo page: - // The IPv4 or IPv6 loopback address is not considered a valid global - // address. - // See http://crbug.com/5234. - // - // OpenBSD does not support it, either. - hints.ai_flags = 0; -#else - hints.ai_flags = AI_ADDRCONFIG; -#endif - - // On Linux AI_ADDRCONFIG doesn't consider loopback addresses, even if only - // loopback addresses are configured. So don't use it when there are only - // loopback addresses. - if (host_resolver_flags & HOST_RESOLVER_LOOPBACK_ONLY) - hints.ai_flags &= ~AI_ADDRCONFIG; - - if (host_resolver_flags & HOST_RESOLVER_CANONNAME) - hints.ai_flags |= AI_CANONNAME; - -#if BUILDFLAG(IS_WIN) - // See crbug.com/1176970. Flag not documented (other than the declaration - // comment in ws2def.h) but confirmed by Microsoft to work for this purpose - // and be safe. - if (host_resolver_flags & HOST_RESOLVER_AVOID_MULTICAST) - hints.ai_flags |= AI_DNS_ONLY; -#endif // BUILDFLAG(IS_WIN) - - // Restrict result set to only this socket type to avoid duplicates. - hints.ai_socktype = SOCK_STREAM; - - // This function can block for a long time. Use ScopedBlockingCall to increase - // the current thread pool's capacity and thus avoid reducing CPU usage by the - // current process during that time. - base::ScopedBlockingCall scoped_blocking_call(FROM_HERE, - base::BlockingType::WILL_BLOCK); - -#if BUILDFLAG(IS_POSIX) && \ - !(BUILDFLAG(IS_APPLE) || BUILDFLAG(IS_OPENBSD) || BUILDFLAG(IS_ANDROID)) - DnsReloaderMaybeReload(); -#endif - auto [ai, err, os_error] = AddressInfo::Get(host, hints, nullptr, network); - bool should_retry = false; - // If the lookup was restricted (either by address family, or address - // detection), and the results where all localhost of a single family, - // maybe we should retry. There were several bugs related to these - // issues, for example http://crbug.com/42058 and http://crbug.com/49024 - if ((hints.ai_family != AF_UNSPEC || hints.ai_flags & AI_ADDRCONFIG) && ai && - ai->IsAllLocalhostOfOneFamily()) { - if (host_resolver_flags & HOST_RESOLVER_DEFAULT_FAMILY_SET_DUE_TO_NO_IPV6) { - hints.ai_family = AF_UNSPEC; - should_retry = true; - } - if (hints.ai_flags & AI_ADDRCONFIG) { - hints.ai_flags &= ~AI_ADDRCONFIG; - should_retry = true; - } - } - if (should_retry) { - std::tie(ai, err, os_error) = - AddressInfo::Get(host, hints, nullptr, network); - } - - if (os_error_opt) - *os_error_opt = os_error; - - if (!ai) - return err; - - *addrlist = ai->CreateAddressList(); - return OK; -} - -SystemHostResolverProc::SystemHostResolverProc() : HostResolverProc(nullptr) {} - -int SystemHostResolverProc::Resolve(const std::string& hostname, - AddressFamily address_family, - HostResolverFlags host_resolver_flags, - AddressList* addr_list, - int* os_error, - handles::NetworkHandle network) { - return SystemHostResolverCall(hostname, address_family, host_resolver_flags, - addr_list, os_error, network); -} - -int SystemHostResolverProc::Resolve(const std::string& hostname, - AddressFamily address_family, - HostResolverFlags host_resolver_flags, - AddressList* addr_list, - int* os_error) { - return Resolve(hostname, address_family, host_resolver_flags, addr_list, - os_error, handles::kInvalidNetworkHandle); -} - -SystemHostResolverProc::~SystemHostResolverProc() = default; - -ProcTaskParams::ProcTaskParams(scoped_refptr<HostResolverProc> resolver_proc, - size_t in_max_retry_attempts) - : resolver_proc(std::move(resolver_proc)), - max_retry_attempts(in_max_retry_attempts), - unresponsive_delay(kDnsDefaultUnresponsiveDelay) { - // Maximum of 4 retry attempts for host resolution. - static const size_t kDefaultMaxRetryAttempts = 4u; - if (max_retry_attempts == HostResolver::ManagerOptions::kDefaultRetryAttempts) - max_retry_attempts = kDefaultMaxRetryAttempts; -} - -ProcTaskParams::ProcTaskParams(const ProcTaskParams& other) = default; - -ProcTaskParams::~ProcTaskParams() = default; - } // namespace net |