Merging upstream version 1.11.0+dfsg.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1098 insertions, 0 deletions

diff --git a/daemon/main.c b/daemon/main.c
new file mode 100644
index 000000000..b2c4c80bf
--- /dev/null
+++ b/daemon/main.c
@@ -0,0 +1,1098 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "common.h"
+
+struct config netdata_config = {
+        .sections = NULL,
+        .mutex = NETDATA_MUTEX_INITIALIZER,
+        .index = {
+                .avl_tree = {
+                        .root = NULL,
+                        .compar = appconfig_section_compare
+                },
+                .rwlock = AVL_LOCK_INITIALIZER
+        }
+};
+
+void netdata_cleanup_and_exit(int ret) {
+    // enabling this, is wrong
+    // because the threads will be cancelled while cleaning up
+    // netdata_exit = 1;
+
+    error_log_limit_unlimited();
+    info("EXIT: netdata prepares to exit with code %d...", ret);
+
+    // cleanup/save the database and exit
+    info("EXIT: cleaning up the database...");
+    rrdhost_cleanup_all();
+
+    if(!ret) {
+        // exit cleanly
+
+        // stop everything
+        info("EXIT: stopping master threads...");
+        cancel_main_threads();
+
+        // free the database
+        info("EXIT: freeing database memory...");
+        rrdhost_free_all();
+    }
+
+    // unlink the pid
+    if(pidfile[0]) {
+        info("EXIT: removing netdata PID file '%s'...", pidfile);
+        if(unlink(pidfile) != 0)
+            error("EXIT: cannot unlink pidfile '%s'.", pidfile);
+    }
+
+    info("EXIT: all done - netdata is now exiting - bye bye...");
+    exit(ret);
+}
+
+struct netdata_static_thread static_threads[] = {
+
+    NETDATA_PLUGIN_HOOK_CHECKS
+    NETDATA_PLUGIN_HOOK_FREEBSD
+    NETDATA_PLUGIN_HOOK_MACOS
+
+    // linux internal plugins
+    NETDATA_PLUGIN_HOOK_LINUX_NFACCT
+    NETDATA_PLUGIN_HOOK_LINUX_PROC
+    NETDATA_PLUGIN_HOOK_LINUX_DISKSPACE
+    NETDATA_PLUGIN_HOOK_LINUX_CGROUPS
+    NETDATA_PLUGIN_HOOK_LINUX_TC
+
+    NETDATA_PLUGIN_HOOK_IDLEJITTER
+    NETDATA_PLUGIN_HOOK_STATSD
+
+        // common plugins for all systems
+    {"BACKENDS",             NULL,                    NULL,         1, NULL, NULL, backends_main},
+    {"WEB_SERVER[multi]",    NULL,                    NULL,         1, NULL, NULL, socket_listen_main_multi_threaded},
+    {"WEB_SERVER[single]",   NULL,                    NULL,         0, NULL, NULL, socket_listen_main_single_threaded},
+    {"WEB_SERVER[static1]",  NULL,                    NULL,         0, NULL, NULL, socket_listen_main_static_threaded},
+    {"STREAM",               NULL,                    NULL,         0, NULL, NULL, rrdpush_sender_thread},
+
+    NETDATA_PLUGIN_HOOK_PLUGINSD
+    NETDATA_PLUGIN_HOOK_HEALTH
+
+    {NULL,                   NULL,                    NULL,         0, NULL, NULL, NULL}
+};
+
+void web_server_threading_selection(void) {
+    web_server_mode = web_server_mode_id(config_get(CONFIG_SECTION_WEB, "mode", web_server_mode_name(web_server_mode)));
+
+    int multi_threaded = (web_server_mode == WEB_SERVER_MODE_MULTI_THREADED);
+    int single_threaded = (web_server_mode == WEB_SERVER_MODE_SINGLE_THREADED);
+    int static_threaded = (web_server_mode == WEB_SERVER_MODE_STATIC_THREADED);
+
+    int i;
+    for (i = 0; static_threads[i].name; i++) {
+        if (static_threads[i].start_routine == socket_listen_main_multi_threaded)
+            static_threads[i].enabled = multi_threaded;
+
+        if (static_threads[i].start_routine == socket_listen_main_single_threaded)
+            static_threads[i].enabled = single_threaded;
+
+        if (static_threads[i].start_routine == socket_listen_main_static_threaded)
+            static_threads[i].enabled = static_threaded;
+    }
+}
+
+void web_server_config_options(void) {
+    web_client_timeout = (int) config_get_number(CONFIG_SECTION_WEB, "disconnect idle clients after seconds", web_client_timeout);
+    web_client_first_request_timeout = (int) config_get_number(CONFIG_SECTION_WEB, "timeout for first request", web_client_first_request_timeout);
+    web_client_streaming_rate_t = config_get_number(CONFIG_SECTION_WEB, "accept a streaming request every seconds", web_client_streaming_rate_t);
+
+    respect_web_browser_do_not_track_policy = config_get_boolean(CONFIG_SECTION_WEB, "respect do not track policy", respect_web_browser_do_not_track_policy);
+    web_x_frame_options = config_get(CONFIG_SECTION_WEB, "x-frame-options response header", "");
+    if(!*web_x_frame_options) web_x_frame_options = NULL;
+
+    web_allow_connections_from = simple_pattern_create(config_get(CONFIG_SECTION_WEB, "allow connections from", "localhost *"), NULL, SIMPLE_PATTERN_EXACT);
+    web_allow_dashboard_from   = simple_pattern_create(config_get(CONFIG_SECTION_WEB, "allow dashboard from", "localhost *"), NULL, SIMPLE_PATTERN_EXACT);
+    web_allow_badges_from      = simple_pattern_create(config_get(CONFIG_SECTION_WEB, "allow badges from", "*"), NULL, SIMPLE_PATTERN_EXACT);
+    web_allow_registry_from    = simple_pattern_create(config_get(CONFIG_SECTION_REGISTRY, "allow from", "*"), NULL, SIMPLE_PATTERN_EXACT);
+    web_allow_streaming_from   = simple_pattern_create(config_get(CONFIG_SECTION_WEB, "allow streaming from", "*"), NULL, SIMPLE_PATTERN_EXACT);
+    web_allow_netdataconf_from = simple_pattern_create(config_get(CONFIG_SECTION_WEB, "allow netdata.conf from", "localhost fd* 10.* 192.168.* 172.16.* 172.17.* 172.18.* 172.19.* 172.20.* 172.21.* 172.22.* 172.23.* 172.24.* 172.25.* 172.26.* 172.27.* 172.28.* 172.29.* 172.30.* 172.31.*"), NULL, SIMPLE_PATTERN_EXACT);
+
+#ifdef NETDATA_WITH_ZLIB
+    web_enable_gzip = config_get_boolean(CONFIG_SECTION_WEB, "enable gzip compression", web_enable_gzip);
+
+    char *s = config_get(CONFIG_SECTION_WEB, "gzip compression strategy", "default");
+    if(!strcmp(s, "default"))
+        web_gzip_strategy = Z_DEFAULT_STRATEGY;
+    else if(!strcmp(s, "filtered"))
+        web_gzip_strategy = Z_FILTERED;
+    else if(!strcmp(s, "huffman only"))
+        web_gzip_strategy = Z_HUFFMAN_ONLY;
+    else if(!strcmp(s, "rle"))
+        web_gzip_strategy = Z_RLE;
+    else if(!strcmp(s, "fixed"))
+        web_gzip_strategy = Z_FIXED;
+    else {
+        error("Invalid compression strategy '%s'. Valid strategies are 'default', 'filtered', 'huffman only', 'rle' and 'fixed'. Proceeding with 'default'.", s);
+        web_gzip_strategy = Z_DEFAULT_STRATEGY;
+    }
+
+    web_gzip_level = (int)config_get_number(CONFIG_SECTION_WEB, "gzip compression level", 3);
+    if(web_gzip_level < 1) {
+        error("Invalid compression level %d. Valid levels are 1 (fastest) to 9 (best ratio). Proceeding with level 1 (fastest compression).", web_gzip_level);
+        web_gzip_level = 1;
+    }
+    else if(web_gzip_level > 9) {
+        error("Invalid compression level %d. Valid levels are 1 (fastest) to 9 (best ratio). Proceeding with level 9 (best compression).", web_gzip_level);
+        web_gzip_level = 9;
+    }
+#endif /* NETDATA_WITH_ZLIB */
+}
+
+
+int killpid(pid_t pid, int signal)
+{
+    int ret = -1;
+    debug(D_EXIT, "Request to kill pid %d", pid);
+
+    errno = 0;
+    if(kill(pid, 0) == -1) {
+        switch(errno) {
+            case ESRCH:
+                error("Request to kill pid %d, but it is not running.", pid);
+                break;
+
+            case EPERM:
+                error("Request to kill pid %d, but I do not have enough permissions.", pid);
+                break;
+
+            default:
+                error("Request to kill pid %d, but I received an error.", pid);
+                break;
+        }
+    }
+    else {
+        errno = 0;
+        ret = kill(pid, signal);
+        if(ret == -1) {
+            switch(errno) {
+                case ESRCH:
+                    error("Cannot kill pid %d, but it is not running.", pid);
+                    break;
+
+                case EPERM:
+                    error("Cannot kill pid %d, but I do not have enough permissions.", pid);
+                    break;
+
+                default:
+                    error("Cannot kill pid %d, but I received an error.", pid);
+                    break;
+            }
+        }
+    }
+
+    return ret;
+}
+
+void cancel_main_threads() {
+    error_log_limit_unlimited();
+
+    int i, found = 0;
+    usec_t max = 5 * USEC_PER_SEC, step = 100000;
+    for (i = 0; static_threads[i].name != NULL ; i++) {
+        if(static_threads[i].enabled == NETDATA_MAIN_THREAD_RUNNING) {
+            info("EXIT: Stopping master thread: %s", static_threads[i].name);
+            netdata_thread_cancel(*static_threads[i].thread);
+            found++;
+        }
+    }
+
+    while(found && max > 0) {
+        max -= step;
+        info("Waiting %d threads to finish...", found);
+        sleep_usec(step);
+        found = 0;
+        for (i = 0; static_threads[i].name != NULL ; i++) {
+            if (static_threads[i].enabled != NETDATA_MAIN_THREAD_EXITED)
+                found++;
+        }
+    }
+
+    if(found) {
+        for (i = 0; static_threads[i].name != NULL ; i++) {
+            if (static_threads[i].enabled != NETDATA_MAIN_THREAD_EXITED)
+                error("Master thread %s takes too long to exit. Giving up...", static_threads[i].name);
+        }
+    }
+    else
+        info("All threads finished.");
+}
+
+struct option_def option_definitions[] = {
+    // opt description                                    arg name       default value
+    { 'c', "Configuration file to load.",                 "filename",    CONFIG_DIR "/" CONFIG_FILENAME},
+    { 'D', "Do not fork. Run in the foreground.",         NULL,          "run in the background"},
+    { 'd', "Fork. Run in the background.",                NULL,          "run in the background"},
+    { 'h', "Display this help message.",                  NULL,          NULL},
+    { 'P', "File to save a pid while running.",           "filename",    "do not save pid to a file"},
+    { 'i', "The IP address to listen to.",                "IP",          "all IP addresses IPv4 and IPv6"},
+    { 'p', "API/Web port to use.",                        "port",        "19999"},
+    { 's', "Prefix for /proc and /sys (for containers).", "path",        "no prefix"},
+    { 't', "The internal clock of netdata.",              "seconds",     "1"},
+    { 'u', "Run as user.",                                "username",    "netdata"},
+    { 'v', "Print netdata version and exit.",             NULL,          NULL},
+    { 'V', "Print netdata version and exit.",             NULL,          NULL},
+    { 'W', "See Advanced options below.",                 "options",     NULL},
+};
+
+int help(int exitcode) {
+    FILE *stream;
+    if(exitcode == 0)
+        stream = stdout;
+    else
+        stream = stderr;
+
+    int num_opts = sizeof(option_definitions) / sizeof(struct option_def);
+    int i;
+    int max_len_arg = 0;
+
+    // Compute maximum argument length
+    for( i = 0; i < num_opts; i++ ) {
+        if(option_definitions[i].arg_name) {
+            int len_arg = (int)strlen(option_definitions[i].arg_name);
+            if(len_arg > max_len_arg) max_len_arg = len_arg;
+        }
+    }
+
+    if(max_len_arg > 30) max_len_arg = 30;
+    if(max_len_arg < 20) max_len_arg = 20;
+
+    fprintf(stream, "%s", "\n"
+            " ^\n"
+            " |.-.   .-.   .-.   .-.   .  netdata                                         \n"
+            " |   '-'   '-'   '-'   '-'   real-time performance monitoring, done right!   \n"
+            " +----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+--->\n"
+            "\n"
+            " Copyright (C) 2016-2017, Costa Tsaousis <costa@tsaousis.gr>\n"
+            " Released under GNU General Public License v3 or later.\n"
+            " All rights reserved.\n"
+            "\n"
+            " Home Page  : https://my-netdata.io\n"
+            " Source Code: https://github.com/netdata/netdata\n"
+            " Wiki / Docs: https://github.com/netdata/netdata/wiki\n"
+            " Support    : https://github.com/netdata/netdata/issues\n"
+            " License    : https://github.com/netdata/netdata/blob/master/LICENSE.md\n"
+            "\n"
+            " Twitter    : https://twitter.com/linuxnetdata\n"
+            " Facebook   : https://www.facebook.com/linuxnetdata/\n"
+            "\n"
+            "\n"
+    );
+
+    fprintf(stream, " SYNOPSIS: netdata [options]\n");
+    fprintf(stream, "\n");
+    fprintf(stream, " Options:\n\n");
+
+    // Output options description.
+    for( i = 0; i < num_opts; i++ ) {
+        fprintf(stream, "  -%c %-*s  %s", option_definitions[i].val, max_len_arg, option_definitions[i].arg_name ? option_definitions[i].arg_name : "", option_definitions[i].description);
+        if(option_definitions[i].default_value) {
+            fprintf(stream, "\n   %c %-*s  Default: %s\n", ' ', max_len_arg, "", option_definitions[i].default_value);
+        } else {
+            fprintf(stream, "\n");
+        }
+        fprintf(stream, "\n");
+    }
+
+    fprintf(stream, "\n Advanced options:\n\n"
+            "  -W stacksize=N           Set the stacksize (in bytes).\n\n"
+            "  -W debug_flags=N         Set runtime tracing to debug.log.\n\n"
+            "  -W unittest              Run internal unittests and exit.\n\n"
+            "  -W set section option value\n"
+            "                           set netdata.conf option from the command line.\n\n"
+            "  -W simple-pattern pattern string\n"
+            "                           Check if string matches pattern and exit.\n\n"
+    );
+
+    fprintf(stream, "\n Signals netdata handles:\n\n"
+            "  - HUP                    Close and reopen log files.\n"
+            "  - USR1                   Save internal DB to disk.\n"
+            "  - USR2                   Reload health configuration.\n"
+            "\n"
+    );
+
+    fflush(stream);
+    return exitcode;
+}
+
+// TODO: Remove this function with the nix major release.
+void remove_option(int opt_index, int *argc, char **argv) {
+    int i;
+
+    // remove the options.
+    do {
+        *argc = *argc - 1;
+        for(i = opt_index; i < *argc; i++) {
+            argv[i] = argv[i+1];
+        }
+        i = opt_index;
+    } while(argv[i][0] != '-' && opt_index >= *argc);
+}
+
+static const char *verify_required_directory(const char *dir) {
+    if(chdir(dir) == -1)
+        fatal("Cannot cd to directory '%s'", dir);
+
+    DIR *d = opendir(dir);
+    if(!d)
+        fatal("Cannot examine the contents of directory '%s'", dir);
+    closedir(d);
+
+    return dir;
+}
+
+void log_init(void) {
+    char filename[FILENAME_MAX + 1];
+    snprintfz(filename, FILENAME_MAX, "%s/debug.log", netdata_configured_log_dir);
+    stdout_filename    = config_get(CONFIG_SECTION_GLOBAL, "debug log",  filename);
+
+    snprintfz(filename, FILENAME_MAX, "%s/error.log", netdata_configured_log_dir);
+    stderr_filename    = config_get(CONFIG_SECTION_GLOBAL, "error log",  filename);
+
+    snprintfz(filename, FILENAME_MAX, "%s/access.log", netdata_configured_log_dir);
+    stdaccess_filename = config_get(CONFIG_SECTION_GLOBAL, "access log", filename);
+
+    error_log_throttle_period = config_get_number(CONFIG_SECTION_GLOBAL, "errors flood protection period", error_log_throttle_period);
+    error_log_errors_per_period = (unsigned long)config_get_number(CONFIG_SECTION_GLOBAL, "errors to trigger flood protection", (long long int)error_log_errors_per_period);
+    error_log_errors_per_period_backup = error_log_errors_per_period;
+
+    setenv("NETDATA_ERRORS_THROTTLE_PERIOD", config_get(CONFIG_SECTION_GLOBAL, "errors flood protection period"    , ""), 1);
+    setenv("NETDATA_ERRORS_PER_PERIOD",      config_get(CONFIG_SECTION_GLOBAL, "errors to trigger flood protection", ""), 1);
+}
+
+static void backwards_compatible_config() {
+    // allow existing configurations to work with the current version of netdata
+
+    if(config_exists(CONFIG_SECTION_GLOBAL, "multi threaded web server")) {
+        int mode = config_get_boolean(CONFIG_SECTION_GLOBAL, "multi threaded web server", 1);
+        web_server_mode = (mode)?WEB_SERVER_MODE_MULTI_THREADED:WEB_SERVER_MODE_SINGLE_THREADED;
+    }
+
+    // move [global] options to the [web] section
+    config_move(CONFIG_SECTION_GLOBAL, "http port listen backlog",
+                CONFIG_SECTION_WEB,    "listen backlog");
+
+    config_move(CONFIG_SECTION_GLOBAL, "bind socket to IP",
+                CONFIG_SECTION_WEB,    "bind to");
+
+    config_move(CONFIG_SECTION_GLOBAL, "bind to",
+                CONFIG_SECTION_WEB,    "bind to");
+
+    config_move(CONFIG_SECTION_GLOBAL, "port",
+                CONFIG_SECTION_WEB,    "default port");
+
+    config_move(CONFIG_SECTION_GLOBAL, "default port",
+                CONFIG_SECTION_WEB,    "default port");
+
+    config_move(CONFIG_SECTION_GLOBAL, "disconnect idle web clients after seconds",
+                CONFIG_SECTION_WEB,    "disconnect idle clients after seconds");
+
+    config_move(CONFIG_SECTION_GLOBAL, "respect web browser do not track policy",
+                CONFIG_SECTION_WEB,    "respect do not track policy");
+
+    config_move(CONFIG_SECTION_GLOBAL, "web x-frame-options header",
+                CONFIG_SECTION_WEB,    "x-frame-options response header");
+
+    config_move(CONFIG_SECTION_GLOBAL, "enable web responses gzip compression",
+                CONFIG_SECTION_WEB,    "enable gzip compression");
+
+    config_move(CONFIG_SECTION_GLOBAL, "web compression strategy",
+                CONFIG_SECTION_WEB,    "gzip compression strategy");
+
+    config_move(CONFIG_SECTION_GLOBAL, "web compression level",
+                CONFIG_SECTION_WEB,    "gzip compression level");
+
+    config_move(CONFIG_SECTION_GLOBAL, "web files owner",
+                CONFIG_SECTION_WEB,    "web files owner");
+
+    config_move(CONFIG_SECTION_GLOBAL, "web files group",
+                CONFIG_SECTION_WEB,    "web files group");
+
+    config_move(CONFIG_SECTION_BACKEND, "opentsdb host tags",
+                CONFIG_SECTION_BACKEND, "host tags");
+}
+
+static void get_netdata_configured_variables() {
+    backwards_compatible_config();
+
+    // ------------------------------------------------------------------------
+    // get the hostname
+
+    char buf[HOSTNAME_MAX + 1];
+    if(gethostname(buf, HOSTNAME_MAX) == -1)
+        error("Cannot get machine hostname.");
+
+    netdata_configured_hostname = config_get(CONFIG_SECTION_GLOBAL, "hostname", buf);
+    debug(D_OPTIONS, "hostname set to '%s'", netdata_configured_hostname);
+
+    // ------------------------------------------------------------------------
+    // get default database size
+
+    default_rrd_history_entries = (int) config_get_number(CONFIG_SECTION_GLOBAL, "history", align_entries_to_pagesize(default_rrd_memory_mode, RRD_DEFAULT_HISTORY_ENTRIES));
+
+    long h = align_entries_to_pagesize(default_rrd_memory_mode, default_rrd_history_entries);
+    if(h != default_rrd_history_entries) {
+        config_set_number(CONFIG_SECTION_GLOBAL, "history", h);
+        default_rrd_history_entries = (int)h;
+    }
+
+    if(default_rrd_history_entries < 5 || default_rrd_history_entries > RRD_HISTORY_ENTRIES_MAX) {
+        error("Invalid history entries %d given. Defaulting to %d.", default_rrd_history_entries, RRD_DEFAULT_HISTORY_ENTRIES);
+        default_rrd_history_entries = RRD_DEFAULT_HISTORY_ENTRIES;
+    }
+
+    // ------------------------------------------------------------------------
+    // get default database update frequency
+
+    default_rrd_update_every = (int) config_get_number(CONFIG_SECTION_GLOBAL, "update every", UPDATE_EVERY);
+    if(default_rrd_update_every < 1 || default_rrd_update_every > 600) {
+        error("Invalid data collection frequency (update every) %d given. Defaulting to %d.", default_rrd_update_every, UPDATE_EVERY_MAX);
+        default_rrd_update_every = UPDATE_EVERY;
+    }
+
+    // ------------------------------------------------------------------------
+    // get system paths
+
+    netdata_configured_user_config_dir  = config_get(CONFIG_SECTION_GLOBAL, "config directory",       netdata_configured_user_config_dir);
+    netdata_configured_stock_config_dir = config_get(CONFIG_SECTION_GLOBAL, "stock config directory", netdata_configured_stock_config_dir);
+    netdata_configured_log_dir          = config_get(CONFIG_SECTION_GLOBAL, "log directory",          netdata_configured_log_dir);
+    netdata_configured_web_dir          = config_get(CONFIG_SECTION_GLOBAL, "web files directory",    netdata_configured_web_dir);
+    netdata_configured_cache_dir        = config_get(CONFIG_SECTION_GLOBAL, "cache directory",        netdata_configured_cache_dir);
+    netdata_configured_varlib_dir       = config_get(CONFIG_SECTION_GLOBAL, "lib directory",          netdata_configured_varlib_dir);
+    netdata_configured_home_dir         = config_get(CONFIG_SECTION_GLOBAL, "home directory",         netdata_configured_home_dir);
+
+    {
+        char plugins_dirs[(FILENAME_MAX * 2) + 1];
+        snprintfz(plugins_dirs, FILENAME_MAX * 2, "\"%s\" \"%s/custom-plugins.d\"", PLUGINS_DIR, CONFIG_DIR);
+        netdata_configured_plugins_dir_base = strdupz(config_get(CONFIG_SECTION_GLOBAL, "plugins directory",  plugins_dirs));
+        quoted_strings_splitter(netdata_configured_plugins_dir_base, plugin_directories, PLUGINSD_MAX_DIRECTORIES, config_isspace);
+        netdata_configured_plugins_dir = plugin_directories[0];
+    }
+
+    // ------------------------------------------------------------------------
+    // get default memory mode for the database
+
+    default_rrd_memory_mode = rrd_memory_mode_id(config_get(CONFIG_SECTION_GLOBAL, "memory mode", rrd_memory_mode_name(default_rrd_memory_mode)));
+
+    // ------------------------------------------------------------------------
+
+    netdata_configured_host_prefix = config_get(CONFIG_SECTION_GLOBAL, "host access prefix", "");
+    verify_netdata_host_prefix();
+
+    // --------------------------------------------------------------------
+    // get KSM settings
+
+#ifdef MADV_MERGEABLE
+    enable_ksm = config_get_boolean(CONFIG_SECTION_GLOBAL, "memory deduplication (ksm)", enable_ksm);
+#endif
+
+    // --------------------------------------------------------------------
+    // get various system parameters
+
+    get_system_HZ();
+    get_system_cpus();
+    get_system_pid_max();
+}
+
+static void get_system_timezone(void) {
+    // avoid flood calls to stat(/etc/localtime)
+    // http://stackoverflow.com/questions/4554271/how-to-avoid-excessive-stat-etc-localtime-calls-in-strftime-on-linux
+    const char *tz = getenv("TZ");
+    if(!tz || !*tz)
+        setenv("TZ", config_get(CONFIG_SECTION_GLOBAL, "TZ environment variable", ":/etc/localtime"), 0);
+
+    char buffer[FILENAME_MAX + 1] = "";
+    const char *timezone = NULL;
+    ssize_t ret;
+
+    // use the TZ variable
+    if(tz && *tz && *tz != ':') {
+        timezone = tz;
+        // info("TIMEZONE: using TZ variable '%s'", timezone);
+    }
+
+    // use the contents of /etc/timezone
+    if(!timezone && !read_file("/etc/timezone", buffer, FILENAME_MAX)) {
+        timezone = buffer;
+        // info("TIMEZONE: using the contents of /etc/timezone: '%s'", timezone);
+    }
+
+    // read the link /etc/localtime
+    if(!timezone) {
+        ret = readlink("/etc/localtime", buffer, FILENAME_MAX);
+
+        if(ret > 0) {
+            buffer[ret] = '\0';
+
+            char   *cmp    = "/usr/share/zoneinfo/";
+            size_t cmp_len = strlen(cmp);
+
+            char *s = strstr(buffer, cmp);
+            if (s && s[cmp_len]) {
+                timezone = &s[cmp_len];
+                // info("TIMEZONE: using the link of /etc/localtime: '%s'", timezone);
+            }
+        }
+        else
+            buffer[0] = '\0';
+    }
+
+    // find the timezone from strftime()
+    if(!timezone) {
+        time_t t;
+        struct tm *tmp, tmbuf;
+
+        t = now_realtime_sec();
+        tmp = localtime_r(&t, &tmbuf);
+
+        if (tmp != NULL) {
+            if(strftime(buffer, FILENAME_MAX, "%Z", tmp) == 0)
+                buffer[0] = '\0';
+            else {
+                buffer[FILENAME_MAX] = '\0';
+                timezone = buffer;
+                // info("TIMEZONE: using strftime(): '%s'", timezone);
+            }
+        }
+    }
+
+    if(timezone && *timezone) {
+        // make sure it does not have illegal characters
+        // info("TIMEZONE: fixing '%s'", timezone);
+
+        size_t len = strlen(timezone);
+        char tmp[len + 1];
+        char *d = tmp;
+        *d = '\0';
+
+        while(*timezone) {
+            if(isalnum(*timezone) || *timezone == '_' || *timezone == '/')
+                *d++ = *timezone++;
+            else
+                timezone++;
+        }
+        *d = '\0';
+        strncpyz(buffer, tmp, len);
+        timezone = buffer;
+        // info("TIMEZONE: fixed as '%s'", timezone);
+    }
+
+    if(!timezone || !*timezone)
+        timezone = "unknown";
+
+    netdata_configured_timezone = config_get(CONFIG_SECTION_GLOBAL, "timezone", timezone);
+}
+
+void set_global_environment() {
+    {
+        char b[16];
+        snprintfz(b, 15, "%d", default_rrd_update_every);
+        setenv("NETDATA_UPDATE_EVERY", b, 1);
+    }
+
+    setenv("NETDATA_HOSTNAME"         , netdata_configured_hostname, 1);
+    setenv("NETDATA_CONFIG_DIR"       , verify_required_directory(netdata_configured_user_config_dir),  1);
+    setenv("NETDATA_USER_CONFIG_DIR"  , verify_required_directory(netdata_configured_user_config_dir),  1);
+    setenv("NETDATA_STOCK_CONFIG_DIR" , verify_required_directory(netdata_configured_stock_config_dir), 1);
+    setenv("NETDATA_PLUGINS_DIR"      , verify_required_directory(netdata_configured_plugins_dir),      1);
+    setenv("NETDATA_WEB_DIR"          , verify_required_directory(netdata_configured_web_dir),          1);
+    setenv("NETDATA_CACHE_DIR"        , verify_required_directory(netdata_configured_cache_dir),        1);
+    setenv("NETDATA_LIB_DIR"          , verify_required_directory(netdata_configured_varlib_dir),       1);
+    setenv("NETDATA_LOG_DIR"          , verify_required_directory(netdata_configured_log_dir),          1);
+    setenv("HOME"                     , verify_required_directory(netdata_configured_home_dir),         1);
+    setenv("NETDATA_HOST_PREFIX"      , netdata_configured_host_prefix, 1);
+
+    get_system_timezone();
+
+    // set the path we need
+    char path[1024 + 1], *p = getenv("PATH");
+    if(!p) p = "/bin:/usr/bin";
+    snprintfz(path, 1024, "%s:%s", p, "/sbin:/usr/sbin:/usr/local/bin:/usr/local/sbin");
+    setenv("PATH", config_get(CONFIG_SECTION_PLUGINS, "PATH environment variable", path), 1);
+
+    // python options
+    p = getenv("PYTHONPATH");
+    if(!p) p = "";
+    setenv("PYTHONPATH", config_get(CONFIG_SECTION_PLUGINS, "PYTHONPATH environment variable", p), 1);
+
+    // disable buffering for python plugins
+    setenv("PYTHONUNBUFFERED", "1", 1);
+
+    // switch to standard locale for plugins
+    setenv("LC_ALL", "C", 1);
+}
+
+static int load_netdata_conf(char *filename, char overwrite_used) {
+    errno = 0;
+
+    int ret = 0;
+
+    if(filename && *filename) {
+        ret = config_load(filename, overwrite_used);
+        if(!ret)
+            error("CONFIG: cannot load config file '%s'.", filename);
+    }
+    else {
+        filename = strdupz_path_subpath(netdata_configured_user_config_dir, "netdata.conf");
+
+        ret = config_load(filename, overwrite_used);
+        if(!ret) {
+            info("CONFIG: cannot load user config '%s'. Will try the stock version.", filename);
+            freez(filename);
+
+            filename = strdupz_path_subpath(netdata_configured_stock_config_dir, "netdata.conf");
+            ret = config_load(filename, overwrite_used);
+            if(!ret)
+                info("CONFIG: cannot load stock config '%s'. Running with internal defaults.", filename);
+        }
+
+        freez(filename);
+    }
+
+    return ret;
+}
+
+int main(int argc, char **argv) {
+    int i;
+    int config_loaded = 0;
+    int dont_fork = 0;
+    size_t default_stacksize;
+
+    // set the name for logging
+    program_name = "netdata";
+
+    // parse depercated options
+    // TODO: Remove this block with the next major release.
+    {
+        i = 1;
+        while(i < argc) {
+            if(strcmp(argv[i], "-pidfile") == 0 && (i+1) < argc) {
+                strncpyz(pidfile, argv[i+1], FILENAME_MAX);
+                fprintf(stderr, "%s: deprecated option -- %s -- please use -P instead.\n", argv[0], argv[i]);
+                remove_option(i, &argc, argv);
+            }
+            else if(strcmp(argv[i], "-nodaemon") == 0 || strcmp(argv[i], "-nd") == 0) {
+                dont_fork = 1;
+                fprintf(stderr, "%s: deprecated option -- %s -- please use -D instead.\n ", argv[0], argv[i]);
+                remove_option(i, &argc, argv);
+            }
+            else if(strcmp(argv[i], "-ch") == 0 && (i+1) < argc) {
+                config_set(CONFIG_SECTION_GLOBAL, "host access prefix", argv[i+1]);
+                fprintf(stderr, "%s: deprecated option -- %s -- please use -s instead.\n", argv[0], argv[i]);
+                remove_option(i, &argc, argv);
+            }
+            else if(strcmp(argv[i], "-l") == 0 && (i+1) < argc) {
+                config_set(CONFIG_SECTION_GLOBAL, "history", argv[i+1]);
+                fprintf(stderr, "%s: deprecated option -- %s -- This option will be removed with V2.*.\n", argv[0], argv[i]);
+                remove_option(i, &argc, argv);
+            }
+            else i++;
+        }
+    }
+
+    // parse options
+    {
+        int num_opts = sizeof(option_definitions) / sizeof(struct option_def);
+        char optstring[(num_opts * 2) + 1];
+
+        int string_i = 0;
+        for( i = 0; i < num_opts; i++ ) {
+            optstring[string_i] = option_definitions[i].val;
+            string_i++;
+            if(option_definitions[i].arg_name) {
+                optstring[string_i] = ':';
+                string_i++;
+            }
+        }
+        // terminate optstring
+        optstring[string_i] ='\0';
+        optstring[(num_opts *2)] ='\0';
+
+        int opt;
+        while( (opt = getopt(argc, argv, optstring)) != -1 ) {
+            switch(opt) {
+                case 'c':
+                    if(load_netdata_conf(optarg, 1) != 1) {
+                        error("Cannot load configuration file %s.", optarg);
+                        return 1;
+                    }
+                    else {
+                        debug(D_OPTIONS, "Configuration loaded from %s.", optarg);
+                        config_loaded = 1;
+                    }
+                    break;
+                case 'D':
+                    dont_fork = 1;
+                    break;
+                case 'd':
+                    dont_fork = 0;
+                    break;
+                case 'h':
+                    return help(0);
+                case 'i':
+                    config_set(CONFIG_SECTION_WEB, "bind to", optarg);
+                    break;
+                case 'P':
+                    strncpy(pidfile, optarg, FILENAME_MAX);
+                    pidfile[FILENAME_MAX] = '\0';
+                    break;
+                case 'p':
+                    config_set(CONFIG_SECTION_GLOBAL, "default port", optarg);
+                    break;
+                case 's':
+                    config_set(CONFIG_SECTION_GLOBAL, "host access prefix", optarg);
+                    break;
+                case 't':
+                    config_set(CONFIG_SECTION_GLOBAL, "update every", optarg);
+                    break;
+                case 'u':
+                    config_set(CONFIG_SECTION_GLOBAL, "run as user", optarg);
+                    break;
+                case 'v':
+                case 'V':
+                    printf("%s %s\n", program_name, program_version);
+                    return 0;
+                case 'W':
+                    {
+                        char* stacksize_string = "stacksize=";
+                        char* debug_flags_string = "debug_flags=";
+
+                        if(strcmp(optarg, "unittest") == 0) {
+                            if(unit_test_buffer()) return 1;
+                            if(unit_test_str2ld()) return 1;
+                            get_netdata_configured_variables();
+                            default_rrd_update_every = 1;
+                            default_rrd_memory_mode = RRD_MEMORY_MODE_RAM;
+                            default_health_enabled = 0;
+                            rrd_init("unittest");
+                            default_rrdpush_enabled = 0;
+                            if(run_all_mockup_tests()) return 1;
+                            if(unit_test_storage()) return 1;
+                            fprintf(stderr, "\n\nALL TESTS PASSED\n\n");
+                            return 0;
+                        }
+                        else if(strcmp(optarg, "simple-pattern") == 0) {
+                            if(optind + 2 > argc) {
+                                fprintf(stderr, "%s", "\nUSAGE: -W simple-pattern 'pattern' 'string'\n\n"
+                                        " Checks if 'pattern' matches the given 'string'.\n"
+                                        " - 'pattern' can be one or more space separated words.\n"
+                                        " - each 'word' can contain one or more asterisks.\n"
+                                        " - words starting with '!' give negative matches.\n"
+                                        " - words are processed left to right\n"
+                                        "\n"
+                                        "Examples:\n"
+                                        "\n"
+                                        " > match all veth interfaces, except veth0:\n"
+                                        "\n"
+                                        "   -W simple-pattern '!veth0 veth*' 'veth12'\n"
+                                        "\n"
+                                        "\n"
+                                        " > match all *.ext files directly in /path/:\n"
+                                        "   (this will not match *.ext files in a subdir of /path/)\n"
+                                        "\n"
+                                        "   -W simple-pattern '!/path/*/*.ext /path/*.ext' '/path/test.ext'\n"
+                                        "\n"
+                                );
+                                return 1;
+                            }
+
+                            const char *heystack = argv[optind];
+                            const char *needle = argv[optind + 1];
+                            size_t len = strlen(needle) + 1;
+                            char wildcarded[len];
+
+                            SIMPLE_PATTERN *p = simple_pattern_create(heystack, NULL, SIMPLE_PATTERN_EXACT);
+                            int ret = simple_pattern_matches_extract(p, needle, wildcarded, len);
+                            simple_pattern_free(p);
+
+                            if(ret) {
+                                fprintf(stdout, "RESULT: MATCHED - pattern '%s' matches '%s', wildcarded '%s'\n", heystack, needle, wildcarded);
+                                return 0;
+                            }
+                            else {
+                                fprintf(stdout, "RESULT: NOT MATCHED - pattern '%s' does not match '%s', wildcarded '%s'\n", heystack, needle, wildcarded);
+                                return 1;
+                            }
+                        }
+                        else if(strncmp(optarg, stacksize_string, strlen(stacksize_string)) == 0) {
+                            optarg += strlen(stacksize_string);
+                            config_set(CONFIG_SECTION_GLOBAL, "pthread stack size", optarg);
+                        }
+                        else if(strncmp(optarg, debug_flags_string, strlen(debug_flags_string)) == 0) {
+                            optarg += strlen(debug_flags_string);
+                            config_set(CONFIG_SECTION_GLOBAL, "debug flags",  optarg);
+                            debug_flags = strtoull(optarg, NULL, 0);
+                        }
+                        else if(strcmp(optarg, "set") == 0) {
+                            if(optind + 3 > argc) {
+                                fprintf(stderr, "%s", "\nUSAGE: -W set 'section' 'key' 'value'\n\n"
+                                        " Overwrites settings of netdata.conf.\n"
+                                        "\n"
+                                        " These options interact with: -c netdata.conf\n"
+                                        " If -c netdata.conf is given on the command line,\n"
+                                        " before -W set... the user may overwrite command\n"
+                                        " line parameters at netdata.conf\n"
+                                        " If -c netdata.conf is given after (or missing)\n"
+                                        " -W set... the user cannot overwrite the command line\n"
+                                        " parameters."
+                                        "\n"
+                                );
+                                return 1;
+                            }
+                            const char *section = argv[optind];
+                            const char *key = argv[optind + 1];
+                            const char *value = argv[optind + 2];
+                            optind += 3;
+
+                            // set this one as the default
+                            // only if it is not already set in the config file
+                            // so the caller can use -c netdata.conf before or
+                            // after this parameter to prevent or allow overwriting
+                            // variables at netdata.conf
+                            config_set_default(section, key,  value);
+
+                            // fprintf(stderr, "SET section '%s', key '%s', value '%s'\n", section, key, value);
+                        }
+                        else if(strcmp(optarg, "get") == 0) {
+                            if(optind + 3 > argc) {
+                                fprintf(stderr, "%s", "\nUSAGE: -W get 'section' 'key' 'value'\n\n"
+                                        " Prints settings of netdata.conf.\n"
+                                        "\n"
+                                        " These options interact with: -c netdata.conf\n"
+                                        " -c netdata.conf has to be given before -W get.\n"
+                                        "\n"
+                                );
+                                return 1;
+                            }
+
+                            if(!config_loaded) {
+                                fprintf(stderr, "warning: no configuration file has been loaded. Use -c CONFIG_FILE, before -W get. Using default config.\n");
+                                load_netdata_conf(NULL, 0);
+                            }
+
+                            backwards_compatible_config();
+                            get_netdata_configured_variables();
+
+                            const char *section = argv[optind];
+                            const char *key = argv[optind + 1];
+                            const char *def = argv[optind + 2];
+                            const char *value = config_get(section, key, def);
+                            printf("%s\n", value);
+                            return 0;
+                        }
+                        else {
+                            fprintf(stderr, "Unknown -W parameter '%s'\n", optarg);
+                            return help(1);
+                        }
+                    }
+                    break;
+
+                default: /* ? */
+                    fprintf(stderr, "Unknown parameter '%c'\n", opt);
+                    return help(1);
+            }
+        }
+    }
+
+#ifdef _SC_OPEN_MAX
+    // close all open file descriptors, except the standard ones
+    // the caller may have left open files (lxc-attach has this issue)
+    {
+        int fd;
+        for(fd = (int) (sysconf(_SC_OPEN_MAX) - 1); fd > 2; fd--)
+            if(fd_is_valid(fd)) close(fd);
+    }
+#endif
+
+    if(!config_loaded)
+        load_netdata_conf(NULL, 0);
+
+    // ------------------------------------------------------------------------
+    // initialize netdata
+    {
+        char *pmax = config_get(CONFIG_SECTION_GLOBAL, "glibc malloc arena max for plugins", "1");
+        if(pmax && *pmax)
+            setenv("MALLOC_ARENA_MAX", pmax, 1);
+
+#if defined(HAVE_C_MALLOPT)
+        i = (int)config_get_number(CONFIG_SECTION_GLOBAL, "glibc malloc arena max for netdata", 1);
+        if(i > 0)
+            mallopt(M_ARENA_MAX, 1);
+#endif
+
+        // prepare configuration environment variables for the plugins
+
+        get_netdata_configured_variables();
+        set_global_environment();
+
+        // work while we are cd into config_dir
+        // to allow the plugins refer to their config
+        // files using relative filenames
+        if(chdir(netdata_configured_user_config_dir) == -1)
+            fatal("Cannot cd to '%s'", netdata_configured_user_config_dir);
+    }
+
+    char *user = NULL;
+
+    {
+        // --------------------------------------------------------------------
+        // get the debugging flags from the configuration file
+
+        char *flags = config_get(CONFIG_SECTION_GLOBAL, "debug flags",  "0x0000000000000000");
+        setenv("NETDATA_DEBUG_FLAGS", flags, 1);
+
+        debug_flags = strtoull(flags, NULL, 0);
+        debug(D_OPTIONS, "Debug flags set to '0x%" PRIX64 "'.", debug_flags);
+
+        if(debug_flags != 0) {
+            struct rlimit rl = { RLIM_INFINITY, RLIM_INFINITY };
+            if(setrlimit(RLIMIT_CORE, &rl) != 0)
+                error("Cannot request unlimited core dumps for debugging... Proceeding anyway...");
+
+#ifdef HAVE_SYS_PRCTL_H
+            prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
+#endif
+        }
+
+
+        // --------------------------------------------------------------------
+        // get log filenames and settings
+
+        log_init();
+        error_log_limit_unlimited();
+
+
+        // --------------------------------------------------------------------
+        // setup process signals
+
+        // block signals while initializing threads.
+        // this causes the threads to block signals.
+        signals_block();
+
+        // setup the signals we want to use
+        signals_init();
+
+        // setup threads configs
+        default_stacksize = netdata_threads_init();
+
+
+        // --------------------------------------------------------------------
+        // check which threads are enabled and initialize them
+
+        for (i = 0; static_threads[i].name != NULL ; i++) {
+            struct netdata_static_thread *st = &static_threads[i];
+
+            if(st->config_name)
+                st->enabled = config_get_boolean(st->config_section, st->config_name, st->enabled);
+
+            if(st->enabled && st->init_routine)
+                st->init_routine();
+        }
+
+
+        // --------------------------------------------------------------------
+        // get the user we should run
+
+        // IMPORTANT: this is required before web_files_uid()
+        if(getuid() == 0) {
+            user = config_get(CONFIG_SECTION_GLOBAL, "run as user", NETDATA_USER);
+        }
+        else {
+            struct passwd *passwd = getpwuid(getuid());
+            user = config_get(CONFIG_SECTION_GLOBAL, "run as user", (passwd && passwd->pw_name)?passwd->pw_name:"");
+        }
+
+        // --------------------------------------------------------------------
+        // create the listening sockets
+
+        web_client_api_v1_init();
+        web_server_threading_selection();
+
+        if(web_server_mode != WEB_SERVER_MODE_NONE)
+            api_listen_sockets_setup();
+    }
+
+    // initialize the log files
+    open_all_log_files();
+
+#ifdef NETDATA_INTERNAL_CHECKS
+    if(debug_flags != 0) {
+        struct rlimit rl = { RLIM_INFINITY, RLIM_INFINITY };
+        if(setrlimit(RLIMIT_CORE, &rl) != 0)
+            error("Cannot request unlimited core dumps for debugging... Proceeding anyway...");
+#ifdef HAVE_SYS_PRCTL_H
+        prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
+#endif
+    }
+#endif /* NETDATA_INTERNAL_CHECKS */
+
+    // get the max file limit
+    if(getrlimit(RLIMIT_NOFILE, &rlimit_nofile) != 0)
+        error("getrlimit(RLIMIT_NOFILE) failed");
+    else
+        info("resources control: allowed file descriptors: soft = %zu, max = %zu", (size_t)rlimit_nofile.rlim_cur, (size_t)rlimit_nofile.rlim_max);
+
+    // fork, switch user, create pid file, set process priority
+    if(become_daemon(dont_fork, user) == -1)
+        fatal("Cannot daemonize myself.");
+
+    info("netdata started on pid %d.", getpid());
+
+    // IMPORTANT: these have to run once, while single threaded
+    // but after we have switched user
+    web_files_uid();
+    web_files_gid();
+
+    netdata_threads_init_after_fork((size_t)config_get_number(CONFIG_SECTION_GLOBAL, "pthread stack size", (long)default_stacksize));
+
+    // ------------------------------------------------------------------------
+    // initialize rrd, registry, health, rrdpush, etc.
+
+    rrd_init(netdata_configured_hostname);
+
+
+    // ------------------------------------------------------------------------
+    // enable log flood protection
+
+    error_log_limit_reset();
+
+
+    // ------------------------------------------------------------------------
+    // spawn the threads
+
+    web_server_config_options();
+
+    for (i = 0; static_threads[i].name != NULL ; i++) {
+        struct netdata_static_thread *st = &static_threads[i];
+
+        if(st->enabled) {
+            st->thread = mallocz(sizeof(netdata_thread_t));
+            debug(D_SYSTEM, "Starting thread %s.", st->name);
+            netdata_thread_create(st->thread, st->name, NETDATA_THREAD_OPTION_DEFAULT, st->start_routine, st);
+        }
+        else debug(D_SYSTEM, "Not starting thread %s.", st->name);
+    }
+
+    info("netdata initialization completed. Enjoy real-time performance monitoring!");
+
+
+    // ------------------------------------------------------------------------
+    // unblock signals
+
+    signals_unblock();
+
+    // ------------------------------------------------------------------------
+    // Handle signals
+
+    signals_handle();
+
+    // should never reach this point
+    // but we need it for rpmlint #2752
+    return 1;
+}