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114 lines
4.1 KiB
C++
114 lines
4.1 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_DNS_HOST_RESOLVER_PROC_H_
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#define NET_DNS_HOST_RESOLVER_PROC_H_
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#include <string>
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#include "base/macros.h"
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#include "base/memory/ref_counted.h"
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#include "net/base/address_family.h"
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#include "net/base/net_export.h"
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namespace net {
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class AddressList;
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// Interface for a getaddrinfo()-like procedure. This is used by unit-tests
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// to control the underlying resolutions in HostResolverImpl. HostResolverProcs
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// can be chained together; they fallback to the next procedure in the chain
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// by calling ResolveUsingPrevious().
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//
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// Note that implementations of HostResolverProc *MUST BE THREADSAFE*, since
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// the HostResolver implementation using them can be multi-threaded.
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class NET_EXPORT HostResolverProc
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: public base::RefCountedThreadSafe<HostResolverProc> {
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public:
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explicit HostResolverProc(HostResolverProc* previous);
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// Resolves |host| to an address list, restricting the results to addresses
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// in |address_family|. If successful returns OK and fills |addrlist| with
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// a list of socket addresses. Otherwise returns a network error code, and
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// fills |os_error| with a more specific error if it was non-NULL.
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virtual int Resolve(const std::string& host,
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AddressFamily address_family,
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HostResolverFlags host_resolver_flags,
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AddressList* addrlist,
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int* os_error) = 0;
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protected:
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friend class base::RefCountedThreadSafe<HostResolverProc>;
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virtual ~HostResolverProc();
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// Asks the fallback procedure (if set) to do the resolve.
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int ResolveUsingPrevious(const std::string& host,
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AddressFamily address_family,
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HostResolverFlags host_resolver_flags,
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AddressList* addrlist,
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int* os_error);
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private:
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friend class HostResolverImpl;
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friend class MockHostResolverBase;
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friend class ScopedDefaultHostResolverProc;
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// Sets the previous procedure in the chain. Aborts if this would result in a
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// cycle.
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void SetPreviousProc(HostResolverProc* proc);
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// Sets the last procedure in the chain, i.e. appends |proc| to the end of the
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// current chain. Aborts if this would result in a cycle.
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void SetLastProc(HostResolverProc* proc);
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// Returns the last procedure in the chain starting at |proc|. Will return
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// NULL iff |proc| is NULL.
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static HostResolverProc* GetLastProc(HostResolverProc* proc);
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// Sets the default host resolver procedure that is used by HostResolverImpl.
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// This can be used through ScopedDefaultHostResolverProc to set a catch-all
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// DNS block in unit-tests (individual tests should use MockHostResolver to
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// prevent hitting the network).
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static HostResolverProc* SetDefault(HostResolverProc* proc);
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static HostResolverProc* GetDefault();
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scoped_refptr<HostResolverProc> previous_proc_;
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static HostResolverProc* default_proc_;
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DISALLOW_COPY_AND_ASSIGN(HostResolverProc);
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};
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// Resolves |host| to an address list, using the system's default host resolver.
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// (i.e. this calls out to getaddrinfo()). If successful returns OK and fills
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// |addrlist| with a list of socket addresses. Otherwise returns a
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// network error code, and fills |os_error| with a more specific error if it
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// was non-NULL.
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NET_EXPORT_PRIVATE int SystemHostResolverCall(
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const std::string& host,
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AddressFamily address_family,
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HostResolverFlags host_resolver_flags,
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AddressList* addrlist,
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int* os_error);
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// Wraps call to SystemHostResolverCall as an instance of HostResolverProc.
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class NET_EXPORT_PRIVATE SystemHostResolverProc : public HostResolverProc {
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public:
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SystemHostResolverProc();
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int Resolve(const std::string& hostname,
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AddressFamily address_family,
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HostResolverFlags host_resolver_flags,
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AddressList* addr_list,
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int* os_error) override;
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protected:
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~SystemHostResolverProc() override;
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DISALLOW_COPY_AND_ASSIGN(SystemHostResolverProc);
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};
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} // namespace net
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#endif // NET_DNS_HOST_RESOLVER_PROC_H_
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