net: move host_resolver files from net/base to net/dns

net/base/host_resolver_proc.cc

Index: net/base/host_resolver_proc.cc
diff --git a/net/base/host_resolver_proc.cc b/net/base/host_resolver_proc.cc
deleted file mode 100644
index 15693fddb2a997d4d21f05cd72c14992c1391c90..0000000000000000000000000000000000000000
--- a/net/base/host_resolver_proc.cc
+++ /dev/null
@@ -1,251 +0,0 @@
-// 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.
-
-#include "net/base/host_resolver_proc.h"
-
-#include "build/build_config.h"
-
-#include "base/logging.h"
-#include "base/sys_byteorder.h"
-#include "net/base/address_list.h"
-#include "net/base/dns_reloader.h"
-#include "net/base/net_errors.h"
-#include "net/base/sys_addrinfo.h"
-
-#if defined(OS_OPENBSD)
-#define AI_ADDRCONFIG 0
-#endif
-
-namespace net {
-
-namespace {
-
-bool IsAllLocalhostOfOneFamily(const struct addrinfo* ai) {
-  bool saw_v4_localhost = false;
-  bool saw_v6_localhost = false;
-  for (; ai != NULL; ai = ai->ai_next) {
-    switch (ai->ai_family) {
-      case AF_INET: {
-        const struct sockaddr_in* addr_in =
-            reinterpret_cast<struct sockaddr_in*>(ai->ai_addr);
-        if ((base::NetToHost32(addr_in->sin_addr.s_addr) & 0xff000000) ==
-            0x7f000000)
-          saw_v4_localhost = true;
-        else
-          return false;
-        break;
-      }
-      case AF_INET6: {
-        const struct sockaddr_in6* addr_in6 =
-            reinterpret_cast<struct sockaddr_in6*>(ai->ai_addr);
-        if (IN6_IS_ADDR_LOOPBACK(&addr_in6->sin6_addr))
-          saw_v6_localhost = true;
-        else
-          return false;
-        break;
-      }
-      default:
-        NOTREACHED();
-        return false;
-    }
-  }
-
-  return saw_v4_localhost != saw_v6_localhost;
-}
-
-}  // namespace
-
-HostResolverProc* HostResolverProc::default_proc_ = NULL;
-
-HostResolverProc::HostResolverProc(HostResolverProc* previous) {
-  SetPreviousProc(previous);
-
-  // Implicitly fall-back to the global default procedure.
-  if (!previous)
-    SetPreviousProc(default_proc_);
-}
-
-HostResolverProc::~HostResolverProc() {
-}
-
-int HostResolverProc::ResolveUsingPrevious(
-    const std::string& host,
-    AddressFamily address_family,
-    HostResolverFlags host_resolver_flags,
-    AddressList* addrlist,
-    int* os_error) {
-  if (previous_proc_) {
-    return previous_proc_->Resolve(host, address_family, host_resolver_flags,
-                                   addrlist, os_error);
-  }
-
-  // Final fallback is the system resolver.
-  return SystemHostResolverProc(host, address_family, host_resolver_flags,
-                                addrlist, os_error);
-}
-
-void HostResolverProc::SetPreviousProc(HostResolverProc* proc) {
-  HostResolverProc* current_previous = previous_proc_;
-  previous_proc_ = NULL;
-  // Now that we've guaranteed |this| is the last proc in a chain, we can
-  // detect potential cycles using GetLastProc().
-  previous_proc_ = (GetLastProc(proc) == this) ? current_previous : proc;
-}
-
-void HostResolverProc::SetLastProc(HostResolverProc* proc) {
-  GetLastProc(this)->SetPreviousProc(proc);
-}
-
-// static
-HostResolverProc* HostResolverProc::GetLastProc(HostResolverProc* proc) {
-  if (proc == NULL)
-    return NULL;
-  HostResolverProc* last_proc = proc;
-  while (last_proc->previous_proc_ != NULL)
-    last_proc = last_proc->previous_proc_;
-  return last_proc;
-}
-
-// static
-HostResolverProc* HostResolverProc::SetDefault(HostResolverProc* proc) {
-  HostResolverProc* old = default_proc_;
-  default_proc_ = proc;
-  return old;
-}
-
-// static
-HostResolverProc* HostResolverProc::GetDefault() {
-  return default_proc_;
-}
-
-int SystemHostResolverProc(const std::string& host,
-                           AddressFamily address_family,
-                           HostResolverFlags host_resolver_flags,
-                           AddressList* addrlist,
-                           int* os_error) {
-  if (os_error)
-    *os_error = 0;
-
-  struct addrinfo* ai = NULL;
-  struct addrinfo hints = {0};
-
-  switch (address_family) {
-    case ADDRESS_FAMILY_IPV4:
-      hints.ai_family = AF_INET;
-      break;
-    case ADDRESS_FAMILY_IPV6:
-      hints.ai_family = AF_INET6;
-      break;
-    case ADDRESS_FAMILY_UNSPECIFIED:
-      hints.ai_family = AF_UNSPEC;
-      break;
-    default:
-      NOTREACHED();
-      hints.ai_family = AF_UNSPEC;
-  }
-
-#if defined(OS_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 addreses, 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;
-
-  // Restrict result set to only this socket type to avoid duplicates.
-  hints.ai_socktype = SOCK_STREAM;
-
-#if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_OPENBSD) && \
-    !defined(OS_ANDROID)
-  DnsReloaderMaybeReload();
-#endif
-  int err = getaddrinfo(host.c_str(), NULL, &hints, &ai);
-  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) &&
-      err == 0 && IsAllLocalhostOfOneFamily(ai)) {
-    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) {
-    if (ai != NULL) {
-      freeaddrinfo(ai);
-      ai = NULL;
-    }
-    err = getaddrinfo(host.c_str(), NULL, &hints, &ai);
-  }
-
-  if (err) {
-#if defined(OS_WIN)
-    err = WSAGetLastError();
-#endif
-
-    // Return the OS error to the caller.
-    if (os_error)
-      *os_error = err;
-
-    // If the call to getaddrinfo() failed because of a system error, report
-    // it separately from ERR_NAME_NOT_RESOLVED.
-#if defined(OS_WIN)
-    if (err != WSAHOST_NOT_FOUND && err != WSANO_DATA)
-      return ERR_NAME_RESOLUTION_FAILED;
-#elif defined(OS_POSIX) && !defined(OS_FREEBSD)
-    if (err != EAI_NONAME && err != EAI_NODATA)
-      return ERR_NAME_RESOLUTION_FAILED;
-#endif
-
-    return ERR_NAME_NOT_RESOLVED;
-  }
-
-#if defined(OS_ANDROID)
-  // Workaround for Android's getaddrinfo leaving ai==NULL without an error.
-  // http://crbug.com/134142
-  if (ai == NULL)
-    return ERR_NAME_NOT_RESOLVED;
-#endif
-
-  *addrlist = AddressList::CreateFromAddrinfo(ai);
-  freeaddrinfo(ai);
-  return OK;
-}
-
-}  // namespace net