config.c

/* Copyright (c) 2001 Matej Pfajfar.
 * Copyright (c) 2001-2004, Roger Dingledine.
 * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
 * Copyright (c) 2007-2012, The Tor Project, Inc. */
/* See LICENSE for licensing information */

/**
 * \file config.c
 * \brief Code to parse and interpret configuration files.
 **/

#define CONFIG_PRIVATE

#include "or.h"
#include "addressmap.h"
#include "channel.h"
#include "circuitbuild.h"
#include "circuitlist.h"
#include "circuitmux.h"
#include "circuitmux_ewma.h"
#include "config.h"
#include "connection.h"
#include "connection_edge.h"
#include "connection_or.h"
#include "control.h"
#include "confparse.h"
#include "cpuworker.h"
#include "dirserv.h"
#include "dirvote.h"
#include "dns.h"
#include "entrynodes.h"
#include "geoip.h"
#include "hibernate.h"
#include "main.h"
#include "networkstatus.h"
#include "nodelist.h"
#include "policies.h"
#include "relay.h"
#include "rendclient.h"
#include "rendservice.h"
#include "rephist.h"
#include "router.h"
#include "util.h"
#include "routerlist.h"
#include "routerset.h"
#include "statefile.h"
#include "transports.h"
#ifdef _WIN32
#include <shlobj.h>
#endif

#include "procmon.h"

/* From main.c */
extern int quiet_level;

/** A list of abbreviations and aliases to map command-line options, obsolete
 * option names, or alternative option names, to their current values. */
static config_abbrev_t option_abbrevs_[] = {
  PLURAL(AuthDirBadDirCC),
  PLURAL(AuthDirBadExitCC),
  PLURAL(AuthDirInvalidCC),
  PLURAL(AuthDirRejectCC),
  PLURAL(ExitNode),
  PLURAL(EntryNode),
  PLURAL(ExcludeNode),
  PLURAL(FirewallPort),
  PLURAL(LongLivedPort),
  PLURAL(HiddenServiceNode),
  PLURAL(HiddenServiceExcludeNode),
  PLURAL(NumCPU),
  PLURAL(RendNode),
  PLURAL(RendExcludeNode),
  PLURAL(StrictEntryNode),
  PLURAL(StrictExitNode),
  PLURAL(StrictNode),
  { "l", "Log", 1, 0},
  { "AllowUnverifiedNodes", "AllowInvalidNodes", 0, 0},
  { "AutomapHostSuffixes", "AutomapHostsSuffixes", 0, 0},
  { "AutomapHostOnResolve", "AutomapHostsOnResolve", 0, 0},
  { "BandwidthRateBytes", "BandwidthRate", 0, 0},
  { "BandwidthBurstBytes", "BandwidthBurst", 0, 0},
  { "DirFetchPostPeriod", "StatusFetchPeriod", 0, 0},
  { "MaxConn", "ConnLimit", 0, 1},
  { "ORBindAddress", "ORListenAddress", 0, 0},
  { "DirBindAddress", "DirListenAddress", 0, 0},
  { "SocksBindAddress", "SocksListenAddress", 0, 0},
  { "UseHelperNodes", "UseEntryGuards", 0, 0},
  { "NumHelperNodes", "NumEntryGuards", 0, 0},
  { "UseEntryNodes", "UseEntryGuards", 0, 0},
  { "NumEntryNodes", "NumEntryGuards", 0, 0},
  { "ResolvConf", "ServerDNSResolvConfFile", 0, 1},
  { "SearchDomains", "ServerDNSSearchDomains", 0, 1},
  { "ServerDNSAllowBrokenResolvConf", "ServerDNSAllowBrokenConfig", 0, 0},
  { "PreferTunnelledDirConns", "PreferTunneledDirConns", 0, 0},
  { "BridgeAuthoritativeDirectory", "BridgeAuthoritativeDir", 0, 0},
  { "HashedControlPassword", "__HashedControlSessionPassword", 1, 0},
  { "StrictEntryNodes", "StrictNodes", 0, 1},
  { "StrictExitNodes", "StrictNodes", 0, 1},
  { "_UseFilteringSSLBufferevents", "UseFilteringSSLBufferevents", 0, 1},
  { NULL, NULL, 0, 0},
};

/** An entry for config_vars: "The option <b>name</b> has type
 * CONFIG_TYPE_<b>conftype</b>, and corresponds to
 * or_options_t.<b>member</b>"
 */
#define VAR(name,conftype,member,initvalue)                             \
  { name, CONFIG_TYPE_ ## conftype, STRUCT_OFFSET(or_options_t, member), \
      initvalue }
/** As VAR, but the option name and member name are the same. */
#define V(member,conftype,initvalue)                                    \
  VAR(#member, conftype, member, initvalue)
/** An entry for config_vars: "The option <b>name</b> is obsolete." */
#define OBSOLETE(name) { name, CONFIG_TYPE_OBSOLETE, 0, NULL }

#define VPORT(member,conftype,initvalue)                                    \
  VAR(#member, conftype, member ## _lines, initvalue)

/** Array of configuration options.  Until we disallow nonstandard
 * abbreviations, order is significant, since the first matching option will
 * be chosen first.
 */
static config_var_t option_vars_[] = {
  OBSOLETE("AccountingMaxKB"),
  V(AccountingMax,               MEMUNIT,  "0 bytes"),
  V(AccountingStart,             STRING,   NULL),
  V(Address,                     STRING,   NULL),
  V(AllowDotExit,                BOOL,     "0"),
  V(AllowInvalidNodes,           CSV,      "middle,rendezvous"),
  V(AllowNonRFC953Hostnames,     BOOL,     "0"),
  V(AllowSingleHopCircuits,      BOOL,     "0"),
  V(AllowSingleHopExits,         BOOL,     "0"),
  V(AlternateBridgeAuthority,    LINELIST, NULL),
  V(AlternateDirAuthority,       LINELIST, NULL),
  V(AlternateHSAuthority,        LINELIST, NULL),
  V(AssumeReachable,             BOOL,     "0"),
  V(AuthDirBadDir,               LINELIST, NULL),
  V(AuthDirBadDirCCs,            CSV,      ""),
  V(AuthDirBadExit,              LINELIST, NULL),
  V(AuthDirBadExitCCs,           CSV,      ""),
  V(AuthDirInvalid,              LINELIST, NULL),
  V(AuthDirInvalidCCs,           CSV,      ""),
  V(AuthDirFastGuarantee,        MEMUNIT,  "100 KB"),
  V(AuthDirGuardBWGuarantee,     MEMUNIT,  "250 KB"),
  V(AuthDirReject,               LINELIST, NULL),
  V(AuthDirRejectCCs,            CSV,      ""),
  V(AuthDirRejectUnlisted,       BOOL,     "0"),
  V(AuthDirListBadDirs,          BOOL,     "0"),
  V(AuthDirListBadExits,         BOOL,     "0"),
  V(AuthDirMaxServersPerAddr,    UINT,     "2"),
  V(AuthDirMaxServersPerAuthAddr,UINT,     "5"),
  V(AuthDirHasIPv6Connectivity,  BOOL,     "0"),
  VAR("AuthoritativeDirectory",  BOOL, AuthoritativeDir,    "0"),
  V(AutomapHostsOnResolve,       BOOL,     "0"),
  V(AutomapHostsSuffixes,        CSV,      ".onion,.exit"),
  V(AvoidDiskWrites,             BOOL,     "0"),
  V(BandwidthBurst,              MEMUNIT,  "1 GB"),
  V(BandwidthRate,               MEMUNIT,  "1 GB"),
  V(BridgeAuthoritativeDir,      BOOL,     "0"),
  VAR("Bridge",                  LINELIST, Bridges,    NULL),
  V(BridgePassword,              STRING,   NULL),
  V(BridgeRecordUsageByCountry,  BOOL,     "1"),
  V(BridgeRelay,                 BOOL,     "0"),
  V(CellStatistics,              BOOL,     "0"),
  V(LearnCircuitBuildTimeout,    BOOL,     "1"),
  V(CircuitBuildTimeout,         INTERVAL, "0"),
  V(CircuitIdleTimeout,          INTERVAL, "1 hour"),
  V(CircuitStreamTimeout,        INTERVAL, "0"),
  V(CircuitPriorityHalflife,     DOUBLE,  "-100.0"), /*negative:'Use default'*/
  V(ClientDNSRejectInternalAddresses, BOOL,"1"),
  V(ClientOnly,                  BOOL,     "0"),
  V(ClientPreferIPv6ORPort,      BOOL,     "0"),
  V(ClientRejectInternalAddresses, BOOL,   "1"),
  V(ClientTransportPlugin,       LINELIST, NULL),
  V(ClientUseIPv6,               BOOL,     "0"),
  V(ConsensusParams,             STRING,   NULL),
  V(ConnLimit,                   UINT,     "1000"),
  V(ConnDirectionStatistics,     BOOL,     "0"),
  V(ConstrainedSockets,          BOOL,     "0"),
  V(ConstrainedSockSize,         MEMUNIT,  "8192"),
  V(ContactInfo,                 STRING,   NULL),
  V(ControlListenAddress,        LINELIST, NULL),
  VPORT(ControlPort,                 LINELIST, NULL),
  V(ControlPortFileGroupReadable,BOOL,     "0"),
  V(ControlPortWriteToFile,      FILENAME, NULL),
  V(ControlSocket,               LINELIST, NULL),
  V(ControlSocketsGroupWritable, BOOL,     "0"),
  V(CookieAuthentication,        BOOL,     "0"),
  V(CookieAuthFileGroupReadable, BOOL,     "0"),
  V(CookieAuthFile,              STRING,   NULL),
  V(CountPrivateBandwidth,       BOOL,     "0"),
  V(DataDirectory,               FILENAME, NULL),
  OBSOLETE("DebugLogFile"),
  V(DisableNetwork,              BOOL,     "0"),
  V(DirAllowPrivateAddresses,    BOOL,     "0"),
  V(TestingAuthDirTimeToLearnReachability, INTERVAL, "30 minutes"),
  V(DirListenAddress,            LINELIST, NULL),
  OBSOLETE("DirFetchPeriod"),
  V(DirPolicy,                   LINELIST, NULL),
  VPORT(DirPort,                     LINELIST, NULL),
  V(DirPortFrontPage,            FILENAME, NULL),
  OBSOLETE("DirPostPeriod"),
  OBSOLETE("DirRecordUsageByCountry"),
  OBSOLETE("DirRecordUsageGranularity"),
  OBSOLETE("DirRecordUsageRetainIPs"),
  OBSOLETE("DirRecordUsageSaveInterval"),
  V(DirReqStatistics,            BOOL,     "1"),
  VAR("DirServer",               LINELIST, DirServers, NULL),
  V(DisableAllSwap,              BOOL,     "0"),
  V(DisableDebuggerAttachment,   BOOL,     "1"),
  V(DisableIOCP,                 BOOL,     "1"),
  V(DynamicDHGroups,             BOOL,     "0"),
  VPORT(DNSPort,                     LINELIST, NULL),
  V(DNSListenAddress,            LINELIST, NULL),
  V(DownloadExtraInfo,           BOOL,     "0"),
  V(EnforceDistinctSubnets,      BOOL,     "1"),
  V(EntryNodes,                  ROUTERSET,   NULL),
  V(EntryStatistics,             BOOL,     "0"),
  V(TestingEstimatedDescriptorPropagationTime, INTERVAL, "10 minutes"),
  V(ExcludeNodes,                ROUTERSET, NULL),
  V(ExcludeExitNodes,            ROUTERSET, NULL),
  V(ExcludeSingleHopRelays,      BOOL,     "1"),
  V(ExitNodes,                   ROUTERSET, NULL),
  V(ExitPolicy,                  LINELIST, NULL),
  V(ExitPolicyRejectPrivate,     BOOL,     "1"),
  V(ExitPortStatistics,          BOOL,     "0"),
  V(ExtendAllowPrivateAddresses, BOOL,     "0"),
  V(ExtraInfoStatistics,         BOOL,     "1"),

#if defined (WINCE)
  V(FallbackNetworkstatusFile,   FILENAME, "fallback-consensus"),
#else
  V(FallbackNetworkstatusFile,   FILENAME,
    SHARE_DATADIR PATH_SEPARATOR "tor" PATH_SEPARATOR "fallback-consensus"),
#endif
  V(FascistFirewall,             BOOL,     "0"),
  V(FirewallPorts,               CSV,      ""),
  V(FastFirstHopPK,              BOOL,     "1"),
  V(FetchDirInfoEarly,           BOOL,     "0"),
  V(FetchDirInfoExtraEarly,      BOOL,     "0"),
  V(FetchServerDescriptors,      BOOL,     "1"),
  V(FetchHidServDescriptors,     BOOL,     "1"),
  V(FetchUselessDescriptors,     BOOL,     "0"),
  V(FetchV2Networkstatus,        BOOL,     "0"),
#ifdef _WIN32
  V(GeoIPFile,                   FILENAME, "<default>"),
  V(GeoIPv6File,                 FILENAME, "<default>"),
#else
  V(GeoIPFile,                   FILENAME,
    SHARE_DATADIR PATH_SEPARATOR "tor" PATH_SEPARATOR "geoip"),
  V(GeoIPv6File,                 FILENAME,
    SHARE_DATADIR PATH_SEPARATOR "tor" PATH_SEPARATOR "geoip6"),
#endif
  OBSOLETE("GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays"),
  OBSOLETE("Group"),
  V(HardwareAccel,               BOOL,     "0"),
  V(HeartbeatPeriod,             INTERVAL, "6 hours"),
  V(AccelName,                   STRING,   NULL),
  V(AccelDir,                    FILENAME, NULL),
  V(HashedControlPassword,       LINELIST, NULL),
  V(HidServDirectoryV2,          BOOL,     "1"),
  VAR("HiddenServiceDir",    LINELIST_S, RendConfigLines,    NULL),
  OBSOLETE("HiddenServiceExcludeNodes"),
  OBSOLETE("HiddenServiceNodes"),
  VAR("HiddenServiceOptions",LINELIST_V, RendConfigLines,    NULL),
  VAR("HiddenServicePort",   LINELIST_S, RendConfigLines,    NULL),
  VAR("HiddenServiceVersion",LINELIST_S, RendConfigLines,    NULL),
  VAR("HiddenServiceAuthorizeClient",LINELIST_S,RendConfigLines, NULL),
  V(HidServAuth,                 LINELIST, NULL),
  V(HSAuthoritativeDir,          BOOL,     "0"),
  OBSOLETE("HSAuthorityRecordStats"),
  V(CloseHSClientCircuitsImmediatelyOnTimeout, BOOL, "0"),
  V(CloseHSServiceRendCircuitsImmediatelyOnTimeout, BOOL, "0"),
  V(HTTPProxy,                   STRING,   NULL),
  V(HTTPProxyAuthenticator,      STRING,   NULL),
  V(HTTPSProxy,                  STRING,   NULL),
  V(HTTPSProxyAuthenticator,     STRING,   NULL),
  //  V(IPv6EXit,                    BOOL,     "0"),
  VAR("ServerTransportPlugin",   LINELIST, ServerTransportPlugin,  NULL),
  V(Socks4Proxy,                 STRING,   NULL),
  V(Socks5Proxy,                 STRING,   NULL),
  V(Socks5ProxyUsername,         STRING,   NULL),
  V(Socks5ProxyPassword,         STRING,   NULL),
  OBSOLETE("IgnoreVersion"),
  V(KeepalivePeriod,             INTERVAL, "5 minutes"),
  VAR("Log",                     LINELIST, Logs,             NULL),
  V(LogMessageDomains,           BOOL,     "0"),
  OBSOLETE("LinkPadding"),
  OBSOLETE("LogLevel"),
  OBSOLETE("LogFile"),
  V(LogTimeGranularity,          MSEC_INTERVAL, "1 second"),
  V(LongLivedPorts,              CSV,
        "21,22,706,1863,5050,5190,5222,5223,6523,6667,6697,8300"),
  VAR("MapAddress",              LINELIST, AddressMap,           NULL),
  V(MaxAdvertisedBandwidth,      MEMUNIT,  "1 GB"),
  V(MaxCircuitDirtiness,         INTERVAL, "10 minutes"),
  V(MaxClientCircuitsPending,    UINT,     "32"),
  V(MaxOnionsPending,            UINT,     "100"),
  OBSOLETE("MonthlyAccountingStart"),
  V(MyFamily,                    STRING,   NULL),
  V(NewCircuitPeriod,            INTERVAL, "30 seconds"),
  VAR("NamingAuthoritativeDirectory",BOOL, NamingAuthoritativeDir, "0"),
  V(NATDListenAddress,           LINELIST, NULL),
  VPORT(NATDPort,                    LINELIST, NULL),
  V(Nickname,                    STRING,   NULL),
  V(WarnUnsafeSocks,              BOOL,     "1"),
  OBSOLETE("NoPublish"),
  VAR("NodeFamily",              LINELIST, NodeFamilies,         NULL),
  V(NumCPUs,                     UINT,     "0"),
  V(NumEntryGuards,              UINT,     "3"),
  V(ORListenAddress,             LINELIST, NULL),
  VPORT(ORPort,                      LINELIST, NULL),
  V(OutboundBindAddress,         LINELIST,   NULL),

  V(PathBiasCircThreshold,       INT,      "-1"),
  V(PathBiasNoticeRate,          DOUBLE,   "-1"),
  V(PathBiasDisableRate,         DOUBLE,   "-1"),
  V(PathBiasScaleThreshold,      INT,      "-1"),
  V(PathBiasScaleFactor,         INT,      "-1"),

  OBSOLETE("PathlenCoinWeight"),
  V(PerConnBWBurst,              MEMUNIT,  "0"),
  V(PerConnBWRate,               MEMUNIT,  "0"),
  V(PidFile,                     STRING,   NULL),
  V(TestingTorNetwork,           BOOL,     "0"),
  V(OptimisticData,              AUTOBOOL, "auto"),
  V(PortForwarding,              BOOL,     "0"),
  V(PortForwardingHelper,        FILENAME, "tor-fw-helper"),
  V(PreferTunneledDirConns,      BOOL,     "1"),
  V(ProtocolWarnings,            BOOL,     "0"),
  V(PublishServerDescriptor,     CSV,      "1"),
  V(PublishHidServDescriptors,   BOOL,     "1"),
  V(ReachableAddresses,          LINELIST, NULL),
  V(ReachableDirAddresses,       LINELIST, NULL),
  V(ReachableORAddresses,        LINELIST, NULL),
  V(RecommendedVersions,         LINELIST, NULL),
  V(RecommendedClientVersions,   LINELIST, NULL),
  V(RecommendedServerVersions,   LINELIST, NULL),
  OBSOLETE("RedirectExit"),
  V(RefuseUnknownExits,          AUTOBOOL, "auto"),
  V(RejectPlaintextPorts,        CSV,      ""),
  V(RelayBandwidthBurst,         MEMUNIT,  "0"),
  V(RelayBandwidthRate,          MEMUNIT,  "0"),
  OBSOLETE("RendExcludeNodes"),
  OBSOLETE("RendNodes"),
  V(RendPostPeriod,              INTERVAL, "1 hour"),
  V(RephistTrackTime,            INTERVAL, "24 hours"),
  OBSOLETE("RouterFile"),
  V(RunAsDaemon,                 BOOL,     "0"),
//  V(RunTesting,                  BOOL,     "0"),
  OBSOLETE("RunTesting"), // currently unused
  V(SafeLogging,                 STRING,   "1"),
  V(SafeSocks,                   BOOL,     "0"),
  V(ServerDNSAllowBrokenConfig,  BOOL,     "1"),
  V(ServerDNSAllowNonRFC953Hostnames, BOOL,"0"),
  V(ServerDNSDetectHijacking,    BOOL,     "1"),
  V(ServerDNSRandomizeCase,      BOOL,     "1"),
  V(ServerDNSResolvConfFile,     STRING,   NULL),
  V(ServerDNSSearchDomains,      BOOL,     "0"),
  V(ServerDNSTestAddresses,      CSV,
      "www.google.com,www.mit.edu,www.yahoo.com,www.slashdot.org"),
  V(ShutdownWaitLength,          INTERVAL, "30 seconds"),
  V(SocksListenAddress,          LINELIST, NULL),
  V(SocksPolicy,                 LINELIST, NULL),
  VPORT(SocksPort,                   LINELIST, NULL),
  V(SocksTimeout,                INTERVAL, "2 minutes"),
  OBSOLETE("StatusFetchPeriod"),
  V(StrictNodes,                 BOOL,     "0"),
  OBSOLETE("SysLog"),
  V(TestSocks,                   BOOL,     "0"),
  OBSOLETE("TestVia"),
  V(TokenBucketRefillInterval,   MSEC_INTERVAL, "100 msec"),
  V(Tor2webMode,                 BOOL,     "0"),
  V(TrackHostExits,              CSV,      NULL),
  V(TrackHostExitsExpire,        INTERVAL, "30 minutes"),
  OBSOLETE("TrafficShaping"),
  V(TransListenAddress,          LINELIST, NULL),
  VPORT(TransPort,                   LINELIST, NULL),
  V(TunnelDirConns,              BOOL,     "1"),
  V(UpdateBridgesFromAuthority,  BOOL,     "0"),
  V(UseBridges,                  BOOL,     "0"),
  V(UseEntryGuards,              BOOL,     "1"),
  V(UseMicrodescriptors,         AUTOBOOL, "auto"),
  V(User,                        STRING,   NULL),
  V(UserspaceIOCPBuffers,        BOOL,     "0"),
  VAR("V1AuthoritativeDirectory",BOOL, V1AuthoritativeDir,   "0"),
  VAR("V2AuthoritativeDirectory",BOOL, V2AuthoritativeDir,   "0"),
  VAR("V3AuthoritativeDirectory",BOOL, V3AuthoritativeDir,   "0"),
  V(TestingV3AuthInitialVotingInterval, INTERVAL, "30 minutes"),
  V(TestingV3AuthInitialVoteDelay, INTERVAL, "5 minutes"),
  V(TestingV3AuthInitialDistDelay, INTERVAL, "5 minutes"),
  V(V3AuthVotingInterval,        INTERVAL, "1 hour"),
  V(V3AuthVoteDelay,             INTERVAL, "5 minutes"),
  V(V3AuthDistDelay,             INTERVAL, "5 minutes"),
  V(V3AuthNIntervalsValid,       UINT,     "3"),
  V(V3AuthUseLegacyKey,          BOOL,     "0"),
  V(V3BandwidthsFile,            FILENAME, NULL),
  VAR("VersioningAuthoritativeDirectory",BOOL,VersioningAuthoritativeDir, "0"),
  V(VirtualAddrNetwork,          STRING,   "127.192.0.0/10"),
  V(WarnPlaintextPorts,          CSV,      "23,109,110,143"),
  V(UseFilteringSSLBufferevents, BOOL,    "0"),
  VAR("__ReloadTorrcOnSIGHUP",   BOOL,  ReloadTorrcOnSIGHUP,      "1"),
  VAR("__AllDirActionsPrivate",  BOOL,  AllDirActionsPrivate,     "0"),
  VAR("__DisablePredictedCircuits",BOOL,DisablePredictedCircuits, "0"),
  VAR("__LeaveStreamsUnattached",BOOL,  LeaveStreamsUnattached,   "0"),
  VAR("__HashedControlSessionPassword", LINELIST, HashedControlSessionPassword,
      NULL),
  VAR("__OwningControllerProcess",STRING,OwningControllerProcess, NULL),
  V(MinUptimeHidServDirectoryV2, INTERVAL, "25 hours"),
  V(VoteOnHidServDirectoriesV2,  BOOL,     "1"),
  VAR("___UsingTestNetworkDefaults", BOOL, UsingTestNetworkDefaults_, "0"),

  { NULL, CONFIG_TYPE_OBSOLETE, 0, NULL }
};

/** Override default values with these if the user sets the TestingTorNetwork
 * option. */
static const config_var_t testing_tor_network_defaults[] = {
  V(ServerDNSAllowBrokenConfig,  BOOL,     "1"),
  V(DirAllowPrivateAddresses,    BOOL,     "1"),
  V(EnforceDistinctSubnets,      BOOL,     "0"),
  V(AssumeReachable,             BOOL,     "1"),
  V(AuthDirMaxServersPerAddr,    UINT,     "0"),
  V(AuthDirMaxServersPerAuthAddr,UINT,     "0"),
  V(ClientDNSRejectInternalAddresses, BOOL,"0"),
  V(ClientRejectInternalAddresses, BOOL,   "0"),
  V(CountPrivateBandwidth,       BOOL,     "1"),
  V(ExitPolicyRejectPrivate,     BOOL,     "0"),
  V(ExtendAllowPrivateAddresses, BOOL,     "1"),
  V(V3AuthVotingInterval,        INTERVAL, "5 minutes"),
  V(V3AuthVoteDelay,             INTERVAL, "20 seconds"),
  V(V3AuthDistDelay,             INTERVAL, "20 seconds"),
  V(TestingV3AuthInitialVotingInterval, INTERVAL, "5 minutes"),
  V(TestingV3AuthInitialVoteDelay, INTERVAL, "20 seconds"),
  V(TestingV3AuthInitialDistDelay, INTERVAL, "20 seconds"),
  V(TestingAuthDirTimeToLearnReachability, INTERVAL, "0 minutes"),
  V(TestingEstimatedDescriptorPropagationTime, INTERVAL, "0 minutes"),
  V(MinUptimeHidServDirectoryV2, INTERVAL, "0 minutes"),
  VAR("___UsingTestNetworkDefaults", BOOL, UsingTestNetworkDefaults_, "1"),

  { NULL, CONFIG_TYPE_OBSOLETE, 0, NULL }
};

#undef VAR
#undef V
#undef OBSOLETE

#ifdef _WIN32
static char *get_windows_conf_root(void);
#endif
static int options_validate(or_options_t *old_options,
                            or_options_t *options,
                            int from_setconf, char **msg);
static int options_act_reversible(const or_options_t *old_options, char **msg);
static int options_act(const or_options_t *old_options);
static int options_transition_allowed(const or_options_t *old,
                                      const or_options_t *new,
                                      char **msg);
static int options_transition_affects_workers(
      const or_options_t *old_options, const or_options_t *new_options);
static int options_transition_affects_descriptor(
      const or_options_t *old_options, const or_options_t *new_options);
static int check_nickname_list(const char *lst, const char *name, char **msg);

static int parse_bridge_line(const char *line, int validate_only);
static int parse_client_transport_line(const char *line, int validate_only);

static int parse_server_transport_line(const char *line, int validate_only);
static int parse_dir_server_line(const char *line,
                                 dirinfo_type_t required_type,
                                 int validate_only);
static void port_cfg_free(port_cfg_t *port);
static int parse_ports(or_options_t *options, int validate_only,
                              char **msg_out, int *n_ports_out);
static int check_server_ports(const smartlist_t *ports,
                              const or_options_t *options);

static int validate_data_directory(or_options_t *options);
static int write_configuration_file(const char *fname,
                                    const or_options_t *options);
static int options_init_logs(or_options_t *options, int validate_only);

static void init_libevent(const or_options_t *options);
static int opt_streq(const char *s1, const char *s2);
static int parse_outbound_addresses(or_options_t *options, int validate_only,
                                    char **msg);
static void config_maybe_load_geoip_files_(const or_options_t *options,
                                           const or_options_t *old_options);

/** Magic value for or_options_t. */
#define OR_OPTIONS_MAGIC 9090909

/** Configuration format for or_options_t. */
static config_format_t options_format = {
  sizeof(or_options_t),
  OR_OPTIONS_MAGIC,
  STRUCT_OFFSET(or_options_t, magic_),
  option_abbrevs_,
  option_vars_,
  (validate_fn_t)options_validate,
  NULL
};

/*
 * Functions to read and write the global options pointer.
 */

/** Command-line and config-file options. */
static or_options_t *global_options = NULL;
/** The fallback options_t object; this is where we look for options not
 * in torrc before we fall back to Tor's defaults. */
static or_options_t *global_default_options = NULL;
/** Name of most recently read torrc file. */
static char *torrc_fname = NULL;
/** Name of the most recently read torrc-defaults file.*/
static char *torrc_defaults_fname;
/** Configuration Options set by command line. */
static config_line_t *global_cmdline_options = NULL;
/** Contents of most recently read DirPortFrontPage file. */
static char *global_dirfrontpagecontents = NULL;
/** List of port_cfg_t for all configured ports. */
static smartlist_t *configured_ports = NULL;

/** Return the contents of our frontpage string, or NULL if not configured. */
const char *
get_dirportfrontpage(void)
{
  return global_dirfrontpagecontents;
}

/** Return the currently configured options. */
or_options_t *
get_options_mutable(void)
{
  tor_assert(global_options);
  return global_options;
}

/** Returns the currently configured options */
const or_options_t *
get_options(void)
{
  return get_options_mutable();
}

/** Change the current global options to contain <b>new_val</b> instead of
 * their current value; take action based on the new value; free the old value
 * as necessary.  Returns 0 on success, -1 on failure.
 */
int
set_options(or_options_t *new_val, char **msg)
{
  int i;
  smartlist_t *elements;
  config_line_t *line;
  or_options_t *old_options = global_options;
  global_options = new_val;
  /* Note that we pass the *old* options below, for comparison. It
   * pulls the new options directly out of global_options. */
  if (options_act_reversible(old_options, msg)<0) {
    tor_assert(*msg);
    global_options = old_options;
    return -1;
  }
  if (options_act(old_options) < 0) { /* acting on the options failed. die. */
    log_err(LD_BUG,
            "Acting on config options left us in a broken state. Dying.");
    exit(1);
  }
  /* Issues a CONF_CHANGED event to notify controller of the change. If Tor is
   * just starting up then the old_options will be undefined. */
  if (old_options && old_options != global_options) {
    elements = smartlist_new();
    for (i=0; options_format.vars[i].name; ++i) {
      const config_var_t *var = &options_format.vars[i];
      const char *var_name = var->name;
      if (var->type == CONFIG_TYPE_LINELIST_S ||
          var->type == CONFIG_TYPE_OBSOLETE) {
        continue;
      }
      if (!config_is_same(&options_format, new_val, old_options, var_name)) {
        line = config_get_assigned_option(&options_format, new_val,
                                          var_name, 1);

        if (line) {
          for (; line; line = line->next) {
            smartlist_add(elements, line->key);
            smartlist_add(elements, line->value);
          }
        } else {
          smartlist_add(elements, (char*)options_format.vars[i].name);
          smartlist_add(elements, NULL);
        }
      }
    }
    control_event_conf_changed(elements);
    smartlist_free(elements);
  }

  if (old_options != global_options)
    config_free(&options_format, old_options);

  return 0;
}

extern const char tor_git_revision[]; /* from tor_main.c */

/** The version of this Tor process, as parsed. */
static char *the_tor_version = NULL;
/** A shorter version of this Tor process's version, for export in our router
 *  descriptor.  (Does not include the git version, if any.) */
static char *the_short_tor_version = NULL;

/** Return the current Tor version. */
const char *
get_version(void)
{
  if (the_tor_version == NULL) {
    if (strlen(tor_git_revision)) {
      tor_asprintf(&the_tor_version, "%s (git-%s)", get_short_version(),
                   tor_git_revision);
    } else {
      the_tor_version = tor_strdup(get_short_version());
    }
  }
  return the_tor_version;
}

/** Return the current Tor version, without any git tag. */
const char *
get_short_version(void)
{

  if (the_short_tor_version == NULL) {
#ifdef TOR_BUILD_TAG
    tor_asprintf(&the_short_tor_version, "%s (%s)", VERSION, TOR_BUILD_TAG);
#else
    the_short_tor_version = tor_strdup(VERSION);
#endif
  }
  return the_short_tor_version;
}

/** Release additional memory allocated in options
 */
static void
or_options_free(or_options_t *options)
{
  if (!options)
    return;

  routerset_free(options->ExcludeExitNodesUnion_);
  if (options->NodeFamilySets) {
    SMARTLIST_FOREACH(options->NodeFamilySets, routerset_t *,
                      rs, routerset_free(rs));
    smartlist_free(options->NodeFamilySets);
  }
  tor_free(options->BridgePassword_AuthDigest_);
  config_free(&options_format, options);
}

/** Release all memory and resources held by global configuration structures.
 */
void
config_free_all(void)
{
  or_options_free(global_options);
  global_options = NULL;
  or_options_free(global_default_options);
  global_default_options = NULL;

  config_free_lines(global_cmdline_options);
  global_cmdline_options = NULL;

  if (configured_ports) {
    SMARTLIST_FOREACH(configured_ports,
                      port_cfg_t *, p, tor_free(p));
    smartlist_free(configured_ports);
    configured_ports = NULL;
  }

  tor_free(torrc_fname);
  tor_free(torrc_defaults_fname);
  tor_free(the_tor_version);
  tor_free(global_dirfrontpagecontents);

  tor_free(the_short_tor_version);
  tor_free(the_tor_version);
}

/** Make <b>address</b> -- a piece of information related to our operation as
 * a client -- safe to log according to the settings in options->SafeLogging,
 * and return it.
 *
 * (We return "[scrubbed]" if SafeLogging is "1", and address otherwise.)
 */
const char *
safe_str_client(const char *address)
{
  tor_assert(address);
  if (get_options()->SafeLogging_ == SAFELOG_SCRUB_ALL)
    return "[scrubbed]";
  else
    return address;
}

/** Make <b>address</b> -- a piece of information of unspecified sensitivity
 * -- safe to log according to the settings in options->SafeLogging, and
 * return it.
 *
 * (We return "[scrubbed]" if SafeLogging is anything besides "0", and address
 * otherwise.)
 */
const char *
safe_str(const char *address)
{
  tor_assert(address);
  if (get_options()->SafeLogging_ != SAFELOG_SCRUB_NONE)
    return "[scrubbed]";
  else
    return address;
}

/** Equivalent to escaped(safe_str_client(address)).  See reentrancy note on
 * escaped(): don't use this outside the main thread, or twice in the same
 * log statement. */
const char *
escaped_safe_str_client(const char *address)
{
  if (get_options()->SafeLogging_ == SAFELOG_SCRUB_ALL)
    return "[scrubbed]";
  else
    return escaped(address);
}

/** Equivalent to escaped(safe_str(address)).  See reentrancy note on
 * escaped(): don't use this outside the main thread, or twice in the same
 * log statement. */
const char *
escaped_safe_str(const char *address)
{
  if (get_options()->SafeLogging_ != SAFELOG_SCRUB_NONE)
    return "[scrubbed]";
  else
    return escaped(address);
}

/** Add the default directory authorities directly into the trusted dir list,
 * but only add them insofar as they share bits with <b>type</b>. */
static void
add_default_trusted_dir_authorities(dirinfo_type_t type)
{
  int i;
  const char *dirservers[] = {
    "moria1 orport=9101 no-v2 "
      "v3ident=D586D18309DED4CD6D57C18FDB97EFA96D330566 "
      "128.31.0.39:9131 9695 DFC3 5FFE B861 329B 9F1A B04C 4639 7020 CE31",
    "tor26 v1 orport=443 v3ident=14C131DFC5C6F93646BE72FA1401C02A8DF2E8B4 "
      "86.59.21.38:80 847B 1F85 0344 D787 6491 A548 92F9 0493 4E4E B85D",
    "dizum orport=443 v3ident=E8A9C45EDE6D711294FADF8E7951F4DE6CA56B58 "
      "194.109.206.212:80 7EA6 EAD6 FD83 083C 538F 4403 8BBF A077 587D D755",