hibernate.c
上传用户:awang829
上传日期:2019-07-14
资源大小:2356k
文件大小:30k
- /* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
- * Copyright (c) 2007-2009, The Tor Project, Inc. */
- /* See LICENSE for licensing information */
- /**
- * file hibernate.c
- * brief Functions to close listeners, stop allowing new circuits,
- * etc in preparation for closing down or going dormant; and to track
- * bandwidth and time intervals to know when to hibernate and when to
- * stop hibernating.
- **/
- /*
- hibernating, phase 1:
- - send destroy in response to create cells
- - send end (policy failed) in response to begin cells
- - close an OR conn when it has no circuits
- hibernating, phase 2:
- (entered when bandwidth hard limit reached)
- - close all OR/AP/exit conns)
- */
- #include "or.h"
- /** Possible values of hibernate_state */
- typedef enum {
- /** We are running normally. */
- HIBERNATE_STATE_LIVE=1,
- /** We're trying to shut down cleanly, and we'll kill all active connections
- * at shutdown_time. */
- HIBERNATE_STATE_EXITING=2,
- /** We're running low on allocated bandwidth for this period, so we won't
- * accept any new connections. */
- HIBERNATE_STATE_LOWBANDWIDTH=3,
- /** We are hibernating, and we won't wake up till there's more bandwidth to
- * use. */
- HIBERNATE_STATE_DORMANT=4
- } hibernate_state_t;
- extern long stats_n_seconds_working; /* published uptime */
- /** Are we currently awake, asleep, running out of bandwidth, or shutting
- * down? */
- static hibernate_state_t hibernate_state = HIBERNATE_STATE_LIVE;
- /** If are hibernating, when do we plan to wake up? Set to 0 if we
- * aren't hibernating. */
- static time_t hibernate_end_time = 0;
- /** If we are shutting down, when do we plan finally exit? Set to 0 if
- * we aren't shutting down. */
- static time_t shutdown_time = 0;
- /** Possible accounting periods. */
- typedef enum {
- UNIT_MONTH=1, UNIT_WEEK=2, UNIT_DAY=3,
- } time_unit_t;
- /* Fields for accounting logic. Accounting overview:
- *
- * Accounting is designed to ensure that no more than N bytes are sent in
- * either direction over a given interval (currently, one month, one week, or
- * one day) We could
- * try to do this by choking our bandwidth to a trickle, but that
- * would make our streams useless. Instead, we estimate what our
- * bandwidth usage will be, and guess how long we'll be able to
- * provide that much bandwidth before hitting our limit. We then
- * choose a random time within the accounting interval to come up (so
- * that we don't get 50 Tors running on the 1st of the month and none
- * on the 30th).
- *
- * Each interval runs as follows:
- *
- * 1. We guess our bandwidth usage, based on how much we used
- * last time. We choose a "wakeup time" within the interval to come up.
- * 2. Until the chosen wakeup time, we hibernate.
- * 3. We come up at the wakeup time, and provide bandwidth until we are
- * "very close" to running out.
- * 4. Then we go into low-bandwidth mode, and stop accepting new
- * connections, but provide bandwidth until we run out.
- * 5. Then we hibernate until the end of the interval.
- *
- * If the interval ends before we run out of bandwidth, we go back to
- * step one.
- */
- /** How many bytes have we read in this accounting interval? */
- static uint64_t n_bytes_read_in_interval = 0;
- /** How many bytes have we written in this accounting interval? */
- static uint64_t n_bytes_written_in_interval = 0;
- /** How many seconds have we been running this interval? */
- static uint32_t n_seconds_active_in_interval = 0;
- /** When did this accounting interval start? */
- static time_t interval_start_time = 0;
- /** When will this accounting interval end? */
- static time_t interval_end_time = 0;
- /** How far into the accounting interval should we hibernate? */
- static time_t interval_wakeup_time = 0;
- /** How much bandwidth do we 'expect' to use per minute? (0 if we have no
- * info from the last period.) */
- static uint64_t expected_bandwidth_usage = 0;
- /** What unit are we using for our accounting? */
- static time_unit_t cfg_unit = UNIT_MONTH;
- /** How many days,hours,minutes into each unit does our accounting interval
- * start? */
- static int cfg_start_day = 0,
- cfg_start_hour = 0,
- cfg_start_min = 0;
- static void reset_accounting(time_t now);
- static int read_bandwidth_usage(void);
- static time_t start_of_accounting_period_after(time_t now);
- static time_t start_of_accounting_period_containing(time_t now);
- static void accounting_set_wakeup_time(void);
- /* ************
- * Functions for bandwidth accounting.
- * ************/
- /** Configure accounting start/end time settings based on
- * options->AccountingStart. Return 0 on success, -1 on failure. If
- * <b>validate_only</b> is true, do not change the current settings. */
- int
- accounting_parse_options(or_options_t *options, int validate_only)
- {
- time_unit_t unit;
- int ok, idx;
- long d,h,m;
- smartlist_t *items;
- const char *v = options->AccountingStart;
- const char *s;
- char *cp;
- if (!v) {
- if (!validate_only) {
- cfg_unit = UNIT_MONTH;
- cfg_start_day = 1;
- cfg_start_hour = 0;
- cfg_start_min = 0;
- }
- return 0;
- }
- items = smartlist_create();
- smartlist_split_string(items, v, NULL,
- SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK,0);
- if (smartlist_len(items)<2) {
- log_warn(LD_CONFIG, "Too few arguments to AccountingStart");
- goto err;
- }
- s = smartlist_get(items,0);
- if (0==strcasecmp(s, "month")) {
- unit = UNIT_MONTH;
- } else if (0==strcasecmp(s, "week")) {
- unit = UNIT_WEEK;
- } else if (0==strcasecmp(s, "day")) {
- unit = UNIT_DAY;
- } else {
- log_warn(LD_CONFIG,
- "Unrecognized accounting unit '%s': only 'month', 'week',"
- " and 'day' are supported.", s);
- goto err;
- }
- switch (unit) {
- case UNIT_WEEK:
- d = tor_parse_long(smartlist_get(items,1), 10, 1, 7, &ok, NULL);
- if (!ok) {
- log_warn(LD_CONFIG, "Weekly accounting must begin on a day between "
- "1 (Monday) and 7 (Sunday)");
- goto err;
- }
- break;
- case UNIT_MONTH:
- d = tor_parse_long(smartlist_get(items,1), 10, 1, 28, &ok, NULL);
- if (!ok) {
- log_warn(LD_CONFIG, "Monthly accounting must begin on a day between "
- "1 and 28");
- goto err;
- }
- break;
- case UNIT_DAY:
- d = 0;
- break;
- default:
- tor_assert(0);
- }
- idx = unit==UNIT_DAY?1:2;
- if (smartlist_len(items) != (idx+1)) {
- log_warn(LD_CONFIG,"Accounting unit '%s' requires %d argument%s.",
- s, idx, (idx>1)?"s":"");
- goto err;
- }
- s = smartlist_get(items, idx);
- h = tor_parse_long(s, 10, 0, 23, &ok, &cp);
- if (!ok) {
- log_warn(LD_CONFIG,"Accounting start time not parseable: bad hour.");
- goto err;
- }
- if (!cp || *cp!=':') {
- log_warn(LD_CONFIG,
- "Accounting start time not parseable: not in HH:MM format");
- goto err;
- }
- m = tor_parse_long(cp+1, 10, 0, 59, &ok, &cp);
- if (!ok) {
- log_warn(LD_CONFIG, "Accounting start time not parseable: bad minute");
- goto err;
- }
- if (!cp || *cp!=' ') {
- log_warn(LD_CONFIG,
- "Accounting start time not parseable: not in HH:MM format");
- goto err;
- }
- if (!validate_only) {
- cfg_unit = unit;
- cfg_start_day = (int)d;
- cfg_start_hour = (int)h;
- cfg_start_min = (int)m;
- }
- SMARTLIST_FOREACH(items, char *, item, tor_free(item));
- smartlist_free(items);
- return 0;
- err:
- SMARTLIST_FOREACH(items, char *, item, tor_free(item));
- smartlist_free(items);
- return -1;
- }
- /** If we want to manage the accounting system and potentially
- * hibernate, return 1, else return 0.
- */
- int
- accounting_is_enabled(or_options_t *options)
- {
- if (options->AccountingMax)
- return 1;
- return 0;
- }
- /** Called from main.c to tell us that <b>seconds</b> seconds have
- * passed, <b>n_read</b> bytes have been read, and <b>n_written</b>
- * bytes have been written. */
- void
- accounting_add_bytes(size_t n_read, size_t n_written, int seconds)
- {
- n_bytes_read_in_interval += n_read;
- n_bytes_written_in_interval += n_written;
- /* If we haven't been called in 10 seconds, we're probably jumping
- * around in time. */
- n_seconds_active_in_interval += (seconds < 10) ? seconds : 0;
- }
- /** If get_end, return the end of the accounting period that contains
- * the time <b>now</b>. Else, return the start of the accounting
- * period that contains the time <b>now</b> */
- static time_t
- edge_of_accounting_period_containing(time_t now, int get_end)
- {
- int before;
- struct tm tm;
- tor_localtime_r(&now, &tm);
- /* Set 'before' to true iff the current time is before the hh:mm
- * changeover time for today. */
- before = tm.tm_hour < cfg_start_hour ||
- (tm.tm_hour == cfg_start_hour && tm.tm_min < cfg_start_min);
- /* Dispatch by unit. First, find the start day of the given period;
- * then, if get_end is true, increment to the end day. */
- switch (cfg_unit)
- {
- case UNIT_MONTH: {
- /* If this is before the Nth, we want the Nth of last month. */
- if (tm.tm_mday < cfg_start_day ||
- (tm.tm_mday < cfg_start_day && before)) {
- --tm.tm_mon;
- }
- /* Otherwise, the month is correct. */
- tm.tm_mday = cfg_start_day;
- if (get_end)
- ++tm.tm_mon;
- break;
- }
- case UNIT_WEEK: {
- /* What is the 'target' day of the week in struct tm format? (We
- say Sunday==7; struct tm says Sunday==0.) */
- int wday = cfg_start_day % 7;
- /* How many days do we subtract from today to get to the right day? */
- int delta = (7+tm.tm_wday-wday)%7;
- /* If we are on the right day, but the changeover hasn't happened yet,
- * then subtract a whole week. */
- if (delta == 0 && before)
- delta = 7;
- tm.tm_mday -= delta;
- if (get_end)
- tm.tm_mday += 7;
- break;
- }
- case UNIT_DAY:
- if (before)
- --tm.tm_mday;
- if (get_end)
- ++tm.tm_mday;
- break;
- default:
- tor_assert(0);
- }
- tm.tm_hour = cfg_start_hour;
- tm.tm_min = cfg_start_min;
- tm.tm_sec = 0;
- tm.tm_isdst = -1; /* Autodetect DST */
- return mktime(&tm);
- }
- /** Return the start of the accounting period containing the time
- * <b>now</b>. */
- static time_t
- start_of_accounting_period_containing(time_t now)
- {
- return edge_of_accounting_period_containing(now, 0);
- }
- /** Return the start of the accounting period that comes after the one
- * containing the time <b>now</b>. */
- static time_t
- start_of_accounting_period_after(time_t now)
- {
- return edge_of_accounting_period_containing(now, 1);
- }
- /** Initialize the accounting subsystem. */
- void
- configure_accounting(time_t now)
- {
- /* Try to remember our recorded usage. */
- if (!interval_start_time)
- read_bandwidth_usage(); /* If we fail, we'll leave values at zero, and
- * reset below.*/
- if (!interval_start_time ||
- start_of_accounting_period_after(interval_start_time) <= now) {
- /* We didn't have recorded usage, or we don't have recorded usage
- * for this interval. Start a new interval. */
- log_info(LD_ACCT, "Starting new accounting interval.");
- reset_accounting(now);
- } else if (interval_start_time ==
- start_of_accounting_period_containing(interval_start_time)) {
- log_info(LD_ACCT, "Continuing accounting interval.");
- /* We are in the interval we thought we were in. Do nothing.*/
- interval_end_time = start_of_accounting_period_after(interval_start_time);
- } else {
- log_warn(LD_ACCT,
- "Mismatched accounting interval; starting a fresh one.");
- reset_accounting(now);
- }
- accounting_set_wakeup_time();
- }
- /** Set expected_bandwidth_usage based on how much we sent/received
- * per minute last interval (if we were up for at least 30 minutes),
- * or based on our declared bandwidth otherwise. */
- static void
- update_expected_bandwidth(void)
- {
- uint64_t used, expected;
- uint64_t max_configured = (get_options()->BandwidthRate * 60);
- if (n_seconds_active_in_interval < 1800) {
- /* If we haven't gotten enough data last interval, set 'expected'
- * to 0. This will set our wakeup to the start of the interval.
- * Next interval, we'll choose our starting time based on how much
- * we sent this interval.
- */
- expected = 0;
- } else {
- used = n_bytes_written_in_interval < n_bytes_read_in_interval ?
- n_bytes_read_in_interval : n_bytes_written_in_interval;
- expected = used / (n_seconds_active_in_interval / 60);
- if (expected > max_configured)
- expected = max_configured;
- }
- expected_bandwidth_usage = expected;
- }
- /** Called at the start of a new accounting interval: reset our
- * expected bandwidth usage based on what happened last time, set up
- * the start and end of the interval, and clear byte/time totals.
- */
- static void
- reset_accounting(time_t now)
- {
- log_info(LD_ACCT, "Starting new accounting interval.");
- update_expected_bandwidth();
- interval_start_time = start_of_accounting_period_containing(now);
- interval_end_time = start_of_accounting_period_after(interval_start_time);
- n_bytes_read_in_interval = 0;
- n_bytes_written_in_interval = 0;
- n_seconds_active_in_interval = 0;
- }
- /** Return true iff we should save our bandwidth usage to disk. */
- static INLINE int
- time_to_record_bandwidth_usage(time_t now)
- {
- /* Note every 600 sec */
- #define NOTE_INTERVAL (600)
- /* Or every 20 megabytes */
- #define NOTE_BYTES 20*(1024*1024)
- static uint64_t last_read_bytes_noted = 0;
- static uint64_t last_written_bytes_noted = 0;
- static time_t last_time_noted = 0;
- if (last_time_noted + NOTE_INTERVAL <= now ||
- last_read_bytes_noted + NOTE_BYTES <= n_bytes_read_in_interval ||
- last_written_bytes_noted + NOTE_BYTES <= n_bytes_written_in_interval ||
- (interval_end_time && interval_end_time <= now)) {
- last_time_noted = now;
- last_read_bytes_noted = n_bytes_read_in_interval;
- last_written_bytes_noted = n_bytes_written_in_interval;
- return 1;
- }
- return 0;
- }
- /** Invoked once per second. Checks whether it is time to hibernate,
- * record bandwidth used, etc. */
- void
- accounting_run_housekeeping(time_t now)
- {
- if (now >= interval_end_time) {
- configure_accounting(now);
- }
- if (time_to_record_bandwidth_usage(now)) {
- if (accounting_record_bandwidth_usage(now, get_or_state())) {
- log_warn(LD_FS, "Couldn't record bandwidth usage to disk.");
- }
- }
- }
- /** When we have no idea how fast we are, how long do we assume it will take
- * us to exhaust our bandwidth? */
- #define GUESS_TIME_TO_USE_BANDWIDTH (24*60*60)
- /** Based on our interval and our estimated bandwidth, choose a
- * deterministic (but random-ish) time to wake up. */
- static void
- accounting_set_wakeup_time(void)
- {
- char buf[ISO_TIME_LEN+1];
- char digest[DIGEST_LEN];
- crypto_digest_env_t *d_env;
- int time_in_interval;
- uint64_t time_to_exhaust_bw;
- int time_to_consider;
- if (! identity_key_is_set()) {
- if (init_keys() < 0) {
- log_err(LD_BUG, "Error initializing keys");
- tor_assert(0);
- }
- }
- format_iso_time(buf, interval_start_time);
- crypto_pk_get_digest(get_identity_key(), digest);
- d_env = crypto_new_digest_env();
- crypto_digest_add_bytes(d_env, buf, ISO_TIME_LEN);
- crypto_digest_add_bytes(d_env, digest, DIGEST_LEN);
- crypto_digest_get_digest(d_env, digest, DIGEST_LEN);
- crypto_free_digest_env(d_env);
- if (!expected_bandwidth_usage) {
- char buf1[ISO_TIME_LEN+1];
- char buf2[ISO_TIME_LEN+1];
- format_local_iso_time(buf1, interval_start_time);
- format_local_iso_time(buf2, interval_end_time);
- time_to_exhaust_bw = GUESS_TIME_TO_USE_BANDWIDTH;
- interval_wakeup_time = interval_start_time;
- log_notice(LD_ACCT,
- "Configured hibernation. This interval begins at %s "
- "and ends at %s. We have no prior estimate for bandwidth, so "
- "we will start out awake and hibernate when we exhaust our quota.",
- buf1, buf2);
- return;
- }
- time_in_interval = (int)(interval_end_time - interval_start_time);
- time_to_exhaust_bw =
- (get_options()->AccountingMax/expected_bandwidth_usage)*60;
- if (time_to_exhaust_bw > TIME_MAX) {
- time_to_exhaust_bw = TIME_MAX;
- time_to_consider = 0;
- } else {
- time_to_consider = time_in_interval - (int)time_to_exhaust_bw;
- }
- if (time_to_consider<=0) {
- interval_wakeup_time = interval_start_time;
- } else {
- /* XXX can we simplify this just by picking a random (non-deterministic)
- * time to be up? If we go down and come up, then we pick a new one. Is
- * that good enough? -RD */
- /* This is not a perfectly unbiased conversion, but it is good enough:
- * in the worst case, the first half of the day is 0.06 percent likelier
- * to be chosen than the last half. */
- interval_wakeup_time = interval_start_time +
- (get_uint32(digest) % time_to_consider);
- format_iso_time(buf, interval_wakeup_time);
- }
- {
- char buf1[ISO_TIME_LEN+1];
- char buf2[ISO_TIME_LEN+1];
- char buf3[ISO_TIME_LEN+1];
- char buf4[ISO_TIME_LEN+1];
- time_t down_time;
- if (interval_wakeup_time+time_to_exhaust_bw > TIME_MAX)
- down_time = TIME_MAX;
- else
- down_time = (time_t)(interval_wakeup_time+time_to_exhaust_bw);
- if (down_time>interval_end_time)
- down_time = interval_end_time;
- format_local_iso_time(buf1, interval_start_time);
- format_local_iso_time(buf2, interval_wakeup_time);
- format_local_iso_time(buf3, down_time);
- format_local_iso_time(buf4, interval_end_time);
- log_notice(LD_ACCT,
- "Configured hibernation. This interval began at %s; "
- "the scheduled wake-up time %s %s; "
- "we expect%s to exhaust our quota for this interval around %s; "
- "the next interval begins at %s (all times local)",
- buf1,
- time(NULL)<interval_wakeup_time?"is":"was", buf2,
- time(NULL)<down_time?"":"ed", buf3,
- buf4);
- }
- }
- /* This rounds 0 up to 1000, but that's actually a feature. */
- #define ROUND_UP(x) (((x) + 0x3ff) & ~0x3ff)
- /** Save all our bandwidth tracking information to disk. Return 0 on
- * success, -1 on failure. */
- int
- accounting_record_bandwidth_usage(time_t now, or_state_t *state)
- {
- /* Just update the state */
- state->AccountingIntervalStart = interval_start_time;
- state->AccountingBytesReadInInterval = ROUND_UP(n_bytes_read_in_interval);
- state->AccountingBytesWrittenInInterval =
- ROUND_UP(n_bytes_written_in_interval);
- state->AccountingSecondsActive = n_seconds_active_in_interval;
- state->AccountingExpectedUsage = expected_bandwidth_usage;
- or_state_mark_dirty(state,
- now+(get_options()->AvoidDiskWrites ? 7200 : 60));
- return 0;
- }
- #undef ROUND_UP
- /** Read stored accounting information from disk. Return 0 on success;
- * return -1 and change nothing on failure. */
- static int
- read_bandwidth_usage(void)
- {
- or_state_t *state = get_or_state();
- {
- char *fname = get_datadir_fname("bw_accounting");
- unlink(fname);
- tor_free(fname);
- }
- if (!state)
- return -1;
- /* Okay; it looks like the state file is more up-to-date than the
- * bw_accounting file, or the bw_accounting file is nonexistent,
- * or the bw_accounting file is corrupt.
- */
- log_info(LD_ACCT, "Reading bandwidth accounting data from state file");
- n_bytes_read_in_interval = state->AccountingBytesReadInInterval;
- n_bytes_written_in_interval = state->AccountingBytesWrittenInInterval;
- n_seconds_active_in_interval = state->AccountingSecondsActive;
- interval_start_time = state->AccountingIntervalStart;
- expected_bandwidth_usage = state->AccountingExpectedUsage;
- {
- char tbuf1[ISO_TIME_LEN+1];
- char tbuf2[ISO_TIME_LEN+1];
- format_iso_time(tbuf1, state->LastWritten);
- format_iso_time(tbuf2, state->AccountingIntervalStart);
- log_info(LD_ACCT,
- "Successfully read bandwidth accounting info from state written at %s "
- "for interval starting at %s. We have been active for %lu seconds in "
- "this interval. At the start of the interval, we expected to use "
- "about %lu KB per second. ("U64_FORMAT" bytes read so far, "
- U64_FORMAT" bytes written so far)",
- tbuf1, tbuf2,
- (unsigned long)n_seconds_active_in_interval,
- (unsigned long)(expected_bandwidth_usage*1024/60),
- U64_PRINTF_ARG(n_bytes_read_in_interval),
- U64_PRINTF_ARG(n_bytes_written_in_interval));
- }
- return 0;
- }
- /** Return true iff we have sent/received all the bytes we are willing
- * to send/receive this interval. */
- static int
- hibernate_hard_limit_reached(void)
- {
- uint64_t hard_limit = get_options()->AccountingMax;
- if (!hard_limit)
- return 0;
- return n_bytes_read_in_interval >= hard_limit
- || n_bytes_written_in_interval >= hard_limit;
- }
- /** Return true iff we have sent/received almost all the bytes we are willing
- * to send/receive this interval. */
- static int
- hibernate_soft_limit_reached(void)
- {
- uint64_t soft_limit = DBL_TO_U64(U64_TO_DBL(get_options()->AccountingMax)
- * .95);
- if (!soft_limit)
- return 0;
- return n_bytes_read_in_interval >= soft_limit
- || n_bytes_written_in_interval >= soft_limit;
- }
- /** Called when we get a SIGINT, or when bandwidth soft limit is
- * reached. Puts us into "loose hibernation": we don't accept new
- * connections, but we continue handling old ones. */
- static void
- hibernate_begin(hibernate_state_t new_state, time_t now)
- {
- connection_t *conn;
- or_options_t *options = get_options();
- if (new_state == HIBERNATE_STATE_EXITING &&
- hibernate_state != HIBERNATE_STATE_LIVE) {
- log_notice(LD_GENERAL,"SIGINT received %s; exiting now.",
- hibernate_state == HIBERNATE_STATE_EXITING ?
- "a second time" : "while hibernating");
- tor_cleanup();
- exit(0);
- }
- /* close listeners. leave control listener(s). */
- while ((conn = connection_get_by_type(CONN_TYPE_OR_LISTENER)) ||
- (conn = connection_get_by_type(CONN_TYPE_AP_LISTENER)) ||
- (conn = connection_get_by_type(CONN_TYPE_AP_TRANS_LISTENER)) ||
- (conn = connection_get_by_type(CONN_TYPE_AP_DNS_LISTENER)) ||
- (conn = connection_get_by_type(CONN_TYPE_AP_NATD_LISTENER)) ||
- (conn = connection_get_by_type(CONN_TYPE_DIR_LISTENER))) {
- log_info(LD_NET,"Closing listener type %d", conn->type);
- connection_mark_for_close(conn);
- }
- /* XXX kill intro point circs */
- /* XXX upload rendezvous service descriptors with no intro points */
- if (new_state == HIBERNATE_STATE_EXITING) {
- log_notice(LD_GENERAL,"Interrupt: will shut down in %d seconds. Interrupt "
- "again to exit now.", options->ShutdownWaitLength);
- shutdown_time = time(NULL) + options->ShutdownWaitLength;
- } else { /* soft limit reached */
- hibernate_end_time = interval_end_time;
- }
- hibernate_state = new_state;
- accounting_record_bandwidth_usage(now, get_or_state());
- or_state_mark_dirty(get_or_state(),
- get_options()->AvoidDiskWrites ? now+600 : 0);
- }
- /** Called when we've been hibernating and our timeout is reached. */
- static void
- hibernate_end(hibernate_state_t new_state)
- {
- tor_assert(hibernate_state == HIBERNATE_STATE_LOWBANDWIDTH ||
- hibernate_state == HIBERNATE_STATE_DORMANT);
- /* listeners will be relaunched in run_scheduled_events() in main.c */
- log_notice(LD_ACCT,"Hibernation period ended. Resuming normal activity.");
- hibernate_state = new_state;
- hibernate_end_time = 0; /* no longer hibernating */
- stats_n_seconds_working = 0; /* reset published uptime */
- }
- /** A wrapper around hibernate_begin, for when we get SIGINT. */
- void
- hibernate_begin_shutdown(void)
- {
- hibernate_begin(HIBERNATE_STATE_EXITING, time(NULL));
- }
- /** Return true iff we are currently hibernating. */
- int
- we_are_hibernating(void)
- {
- return hibernate_state != HIBERNATE_STATE_LIVE;
- }
- /** If we aren't currently dormant, close all connections and become
- * dormant. */
- static void
- hibernate_go_dormant(time_t now)
- {
- connection_t *conn;
- if (hibernate_state == HIBERNATE_STATE_DORMANT)
- return;
- else if (hibernate_state == HIBERNATE_STATE_LOWBANDWIDTH)
- hibernate_state = HIBERNATE_STATE_DORMANT;
- else
- hibernate_begin(HIBERNATE_STATE_DORMANT, now);
- log_notice(LD_ACCT,"Going dormant. Blowing away remaining connections.");
- /* Close all OR/AP/exit conns. Leave dir conns because we still want
- * to be able to upload server descriptors so people know we're still
- * running, and download directories so we can detect if we're obsolete.
- * Leave control conns because we still want to be controllable.
- */
- while ((conn = connection_get_by_type(CONN_TYPE_OR)) ||
- (conn = connection_get_by_type(CONN_TYPE_AP)) ||
- (conn = connection_get_by_type(CONN_TYPE_EXIT))) {
- if (CONN_IS_EDGE(conn))
- connection_edge_end(TO_EDGE_CONN(conn), END_STREAM_REASON_HIBERNATING);
- log_info(LD_NET,"Closing conn type %d", conn->type);
- if (conn->type == CONN_TYPE_AP) /* send socks failure if needed */
- connection_mark_unattached_ap(TO_EDGE_CONN(conn),
- END_STREAM_REASON_HIBERNATING);
- else
- connection_mark_for_close(conn);
- }
- if (now < interval_wakeup_time)
- hibernate_end_time = interval_wakeup_time;
- else
- hibernate_end_time = interval_end_time;
- accounting_record_bandwidth_usage(now, get_or_state());
- or_state_mark_dirty(get_or_state(),
- get_options()->AvoidDiskWrites ? now+600 : 0);
- }
- /** Called when hibernate_end_time has arrived. */
- static void
- hibernate_end_time_elapsed(time_t now)
- {
- char buf[ISO_TIME_LEN+1];
- /* The interval has ended, or it is wakeup time. Find out which. */
- accounting_run_housekeeping(now);
- if (interval_wakeup_time <= now) {
- /* The interval hasn't changed, but interval_wakeup_time has passed.
- * It's time to wake up and start being a server. */
- hibernate_end(HIBERNATE_STATE_LIVE);
- return;
- } else {
- /* The interval has changed, and it isn't time to wake up yet. */
- hibernate_end_time = interval_wakeup_time;
- format_iso_time(buf,interval_wakeup_time);
- if (hibernate_state != HIBERNATE_STATE_DORMANT) {
- /* We weren't sleeping before; we should sleep now. */
- log_notice(LD_ACCT,
- "Accounting period ended. Commencing hibernation until "
- "%s GMT", buf);
- hibernate_go_dormant(now);
- } else {
- log_notice(LD_ACCT,
- "Accounting period ended. This period, we will hibernate"
- " until %s GMT",buf);
- }
- }
- }
- /** Consider our environment and decide if it's time
- * to start/stop hibernating.
- */
- void
- consider_hibernation(time_t now)
- {
- int accounting_enabled = get_options()->AccountingMax != 0;
- char buf[ISO_TIME_LEN+1];
- /* If we're in 'exiting' mode, then we just shut down after the interval
- * elapses. */
- if (hibernate_state == HIBERNATE_STATE_EXITING) {
- tor_assert(shutdown_time);
- if (shutdown_time <= now) {
- log_notice(LD_GENERAL, "Clean shutdown finished. Exiting.");
- tor_cleanup();
- exit(0);
- }
- return; /* if exiting soon, don't worry about bandwidth limits */
- }
- if (hibernate_state == HIBERNATE_STATE_DORMANT) {
- /* We've been hibernating because of bandwidth accounting. */
- tor_assert(hibernate_end_time);
- if (hibernate_end_time > now && accounting_enabled) {
- /* If we're hibernating, don't wake up until it's time, regardless of
- * whether we're in a new interval. */
- return ;
- } else {
- hibernate_end_time_elapsed(now);
- }
- }
- /* Else, we aren't hibernating. See if it's time to start hibernating, or to
- * go dormant. */
- if (hibernate_state == HIBERNATE_STATE_LIVE) {
- if (hibernate_soft_limit_reached()) {
- log_notice(LD_ACCT,
- "Bandwidth soft limit reached; commencing hibernation.");
- hibernate_begin(HIBERNATE_STATE_LOWBANDWIDTH, now);
- } else if (accounting_enabled && now < interval_wakeup_time) {
- format_local_iso_time(buf,interval_wakeup_time);
- log_notice(LD_ACCT,
- "Commencing hibernation. We will wake up at %s local time.",
- buf);
- hibernate_go_dormant(now);
- }
- }
- if (hibernate_state == HIBERNATE_STATE_LOWBANDWIDTH) {
- if (!accounting_enabled) {
- hibernate_end_time_elapsed(now);
- } else if (hibernate_hard_limit_reached()) {
- hibernate_go_dormant(now);
- } else if (hibernate_end_time <= now) {
- /* The hibernation period ended while we were still in lowbandwidth.*/
- hibernate_end_time_elapsed(now);
- }
- }
- }
- /** Helper function: called when we get a GETINFO request for an
- * accounting-related key on the control connection <b>conn</b>. If we can
- * answer the request for <b>question</b>, then set *<b>answer</b> to a newly
- * allocated string holding the result. Otherwise, set *<b>answer</b> to
- * NULL. */
- int
- getinfo_helper_accounting(control_connection_t *conn,
- const char *question, char **answer)
- {
- (void) conn;
- if (!strcmp(question, "accounting/enabled")) {
- *answer = tor_strdup(accounting_is_enabled(get_options()) ? "1" : "0");
- } else if (!strcmp(question, "accounting/hibernating")) {
- if (hibernate_state == HIBERNATE_STATE_DORMANT)
- *answer = tor_strdup("hard");
- else if (hibernate_state == HIBERNATE_STATE_LOWBANDWIDTH)
- *answer = tor_strdup("soft");
- else
- *answer = tor_strdup("awake");
- } else if (!strcmp(question, "accounting/bytes")) {
- *answer = tor_malloc(32);
- tor_snprintf(*answer, 32, U64_FORMAT" "U64_FORMAT,
- U64_PRINTF_ARG(n_bytes_read_in_interval),
- U64_PRINTF_ARG(n_bytes_written_in_interval));
- } else if (!strcmp(question, "accounting/bytes-left")) {
- uint64_t limit = get_options()->AccountingMax;
- uint64_t read_left = 0, write_left = 0;
- if (n_bytes_read_in_interval < limit)
- read_left = limit - n_bytes_read_in_interval;
- if (n_bytes_written_in_interval < limit)
- write_left = limit - n_bytes_written_in_interval;
- *answer = tor_malloc(64);
- tor_snprintf(*answer, 64, U64_FORMAT" "U64_FORMAT,
- U64_PRINTF_ARG(read_left), U64_PRINTF_ARG(write_left));
- } else if (!strcmp(question, "accounting/interval-start")) {
- *answer = tor_malloc(ISO_TIME_LEN+1);
- format_iso_time(*answer, interval_start_time);
- } else if (!strcmp(question, "accounting/interval-wake")) {
- *answer = tor_malloc(ISO_TIME_LEN+1);
- format_iso_time(*answer, interval_wakeup_time);
- } else if (!strcmp(question, "accounting/interval-end")) {
- *answer = tor_malloc(ISO_TIME_LEN+1);
- format_iso_time(*answer, interval_end_time);
- } else {
- *answer = NULL;
- }
- return 0;
- }