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// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_OMAHA_REQUEST_ACTION_H__
#define CHROMEOS_PLATFORM_UPDATE_ENGINE_OMAHA_REQUEST_ACTION_H__
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <string>
#include <vector>
#include <base/memory/scoped_ptr.h>
#include <curl/curl.h>
#include <libxml/parser.h>
#include "update_engine/action.h"
#include "update_engine/http_fetcher.h"
#include "update_engine/omaha_response.h"
// The Omaha Request action makes a request to Omaha and can output
// the response on the output ActionPipe.
namespace chromeos_update_engine {
// Encodes XML entities in a given string with libxml2. input must be
// UTF-8 formatted. Output will be UTF-8 formatted.
std::string XmlEncode(const std::string& input);
// This struct encapsulates the Omaha event information. For a
// complete list of defined event types and results, see
// http://code.google.com/p/omaha/wiki/ServerProtocol#event
struct OmahaEvent {
// The Type values correspond to EVENT_TYPE values of Omaha.
enum Type {
kTypeUnknown = 0,
kTypeDownloadComplete = 1,
kTypeInstallComplete = 2,
kTypeUpdateComplete = 3,
kTypeUpdateDownloadStarted = 13,
kTypeUpdateDownloadFinished = 14,
};
// The Result values correspond to EVENT_RESULT values of Omaha.
enum Result {
kResultError = 0,
kResultSuccess = 1,
kResultSuccessReboot = 2,
kResultUpdateDeferred = 9, // When we ignore/defer updates due to policy.
};
OmahaEvent()
: type(kTypeUnknown),
result(kResultError),
error_code(kErrorCodeError) {}
explicit OmahaEvent(Type in_type)
: type(in_type),
result(kResultSuccess),
error_code(kErrorCodeSuccess) {}
OmahaEvent(Type in_type, Result in_result, ErrorCode in_error_code)
: type(in_type),
result(in_result),
error_code(in_error_code) {}
Type type;
Result result;
ErrorCode error_code;
};
class NoneType;
class OmahaRequestAction;
class OmahaRequestParams;
class PrefsInterface;
template<>
class ActionTraits<OmahaRequestAction> {
public:
// Takes parameters on the input pipe.
typedef NoneType InputObjectType;
// On UpdateCheck success, puts the Omaha response on output. Event
// requests do not have an output pipe.
typedef OmahaResponse OutputObjectType;
};
class OmahaRequestAction : public Action<OmahaRequestAction>,
public HttpFetcherDelegate {
public:
static const int kNeverPinged = -1;
static const int kPingTimeJump = -2;
// We choose this value of 10 as a heuristic for a work day in trying
// each URL, assuming we check roughly every 45 mins. This is a good time to
// wait - neither too long nor too little - so we don't give up the preferred
// URLs that appear earlier in list too quickly before moving on to the
// fallback ones.
static const int kDefaultMaxFailureCountPerUrl = 10;
// These are the possible outcome upon checking whether we satisfied
// the wall-clock-based-wait.
enum WallClockWaitResult {
kWallClockWaitNotSatisfied,
kWallClockWaitDoneButUpdateCheckWaitRequired,
kWallClockWaitDoneAndUpdateCheckWaitNotRequired,
};
// The ctor takes in all the parameters that will be used for making
// the request to Omaha. For some of them we have constants that
// should be used.
//
// Takes ownership of the passed in HttpFetcher. Useful for testing.
//
// Takes ownership of the passed in OmahaEvent. If |event| is NULL,
// this is an UpdateCheck request, otherwise it's an Event request.
// Event requests always succeed.
//
// A good calling pattern is:
// OmahaRequestAction(..., new OmahaEvent(...), new WhateverHttpFetcher);
// or
// OmahaRequestAction(..., NULL, new WhateverHttpFetcher);
OmahaRequestAction(SystemState* system_state,
OmahaEvent* event,
HttpFetcher* http_fetcher,
bool ping_only);
virtual ~OmahaRequestAction();
typedef ActionTraits<OmahaRequestAction>::InputObjectType InputObjectType;
typedef ActionTraits<OmahaRequestAction>::OutputObjectType OutputObjectType;
void PerformAction();
void TerminateProcessing();
int GetHTTPResponseCode() { return http_fetcher_->http_response_code(); }
// Debugging/logging
static std::string StaticType() { return "OmahaRequestAction"; }
std::string Type() const { return StaticType(); }
// Delegate methods (see http_fetcher.h)
virtual void ReceivedBytes(HttpFetcher *fetcher,
const char* bytes, int length);
virtual void TransferComplete(HttpFetcher *fetcher, bool successful);
// Returns true if this is an Event request, false if it's an UpdateCheck.
bool IsEvent() const { return event_.get() != NULL; }
private:
// If this is an update check request, initializes
// |ping_active_days_| and |ping_roll_call_days_| to values that may
// be sent as pings to Omaha.
void InitPingDays();
// Based on the persistent preference store values, calculates the
// number of days since the last ping sent for |key|.
int CalculatePingDays(const std::string& key);
// Returns true if the download of a new update should be deferred.
// False if the update can be downloaded.
bool ShouldDeferDownload(OmahaResponse* output_object);
// Returns true if the basic wall-clock-based waiting period has been
// satisfied based on the scattering policy setting. False otherwise.
// If true, it also indicates whether the additional update-check-count-based
// waiting period also needs to be satisfied before the download can begin.
WallClockWaitResult IsWallClockBasedWaitingSatisfied(
OmahaResponse* output_object);
// Returns true if the update-check-count-based waiting period has been
// satisfied. False otherwise.
bool IsUpdateCheckCountBasedWaitingSatisfied();
// Parses the response from Omaha that's available in |doc| using the other
// helper methods below and populates the |output_object| with the relevant
// values. Returns true if we should continue the parsing. False otherwise,
// in which case it sets any error code using |completer|.
bool ParseResponse(xmlDoc* doc,
OmahaResponse* output_object,
ScopedActionCompleter* completer);
// Parses the status property in the given update_check_node and populates
// |output_object| if valid. Returns true if we should continue the parsing.
// False otherwise, in which case it sets any error code using |completer|.
bool ParseStatus(xmlNode* update_check_node,
OmahaResponse* output_object,
ScopedActionCompleter* completer);
// Parses the URL nodes in the given XML document and populates
// |output_object| if valid. Returns true if we should continue the parsing.
// False otherwise, in which case it sets any error code using |completer|.
bool ParseUrls(xmlDoc* doc,
OmahaResponse* output_object,
ScopedActionCompleter* completer);
// Parses the package node in the given XML document and populates
// |output_object| if valid. Returns true if we should continue the parsing.
// False otherwise, in which case it sets any error code using |completer|.
bool ParsePackage(xmlDoc* doc,
OmahaResponse* output_object,
ScopedActionCompleter* completer);
// Parses the other parameters in the given XML document and populates
// |output_object| if valid. Returns true if we should continue the parsing.
// False otherwise, in which case it sets any error code using |completer|.
bool ParseParams(xmlDoc* doc,
OmahaResponse* output_object,
ScopedActionCompleter* completer);
// Global system context.
SystemState* system_state_;
// Contains state that is relevant in the processing of the Omaha request.
OmahaRequestParams* params_;
// Pointer to the OmahaEvent info. This is an UpdateCheck request if NULL.
scoped_ptr<OmahaEvent> event_;
// pointer to the HttpFetcher that does the http work
scoped_ptr<HttpFetcher> http_fetcher_;
// If true, only include the <ping> element in the request.
bool ping_only_;
// Stores the response from the omaha server
std::vector<char> response_buffer_;
// Initialized by InitPingDays to values that may be sent to Omaha
// as part of a ping message. Note that only positive values and -1
// are sent to Omaha.
int ping_active_days_;
int ping_roll_call_days_;
DISALLOW_COPY_AND_ASSIGN(OmahaRequestAction);
};
} // namespace chromeos_update_engine
#endif // CHROMEOS_PLATFORM_UPDATE_ENGINE_OMAHA_REQUEST_ACTION_H__