main_config.c

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/*
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
/**
 * $Id: 251f10bcbd4705e7d4c615361fecae39b87b4967 $
 *
 * @brief Handle the the main server's (radiusd) configuration.
 * @file src/lib/server/main_config.c
 *
 * @copyright 2002,2006-2007 The FreeRADIUS server project
 * @copyright 2002 Alan DeKok (aland@freeradius.org)
 */
 
RCSID("$Id: 251f10bcbd4705e7d4c615361fecae39b87b4967 $")
 
#include <freeradius-devel/server/cf_file.h>
#include <freeradius-devel/server/cf_util.h>
#include <freeradius-devel/server/client.h>
#include <freeradius-devel/server/dependency.h>
#include <freeradius-devel/server/main_config.h>
#include <freeradius-devel/server/map_proc.h>
#include <freeradius-devel/server/modpriv.h>
#include <freeradius-devel/server/module.h>
#include <freeradius-devel/server/util.h>
#include <freeradius-devel/server/virtual_servers.h>
 
#include <freeradius-devel/unlang/xlat.h>
 
#include <freeradius-devel/util/conf.h>
#include <freeradius-devel/util/debug.h>
#include <freeradius-devel/util/dict.h>
#include <freeradius-devel/util/file.h>
#include <freeradius-devel/util/hw.h>
#include <freeradius-devel/util/perm.h>
#include <freeradius-devel/util/sem.h>
#include <freeradius-devel/util/token.h>
#include <freeradius-devel/util/pair_legacy.h>
 
#include <freeradius-devel/unlang/xlat_func.h>
 
#include <sys/stat.h>
#include <pwd.h>
#include <grp.h>
 
#include <unistd.h>
#include <sys/types.h>
 
#ifdef HAVE_SYSLOG_H
#  include <syslog.h>
#endif
 
#ifdef HAVE_FCNTL_H
#  include <fcntl.h>
#endif
 
main_config_t const     *main_config;                           //!< Main server configuration.
 
extern fr_log_t         debug_log;
 
fr_log_t                debug_log = { .fd = -1, .dst = L_DST_NULL };
 
/**********************************************************************
 *
 *      We need to figure out where the logs go, before doing anything
 *      else.  This is so that the log messages go to the correct
 *      place.
 *
 *      BUT, we want the settings from the command line to over-ride
 *      the ones in the configuration file.  So, these items are
 *      parsed ONLY if there is no "-l foo" on the command line.
 *
 **********************************************************************/
 
static int reverse_lookups_parse(TALLOC_CTX *ctx, void *out, void *parent,CONF_ITEM *ci, conf_parser_t const *rule);
static int hostname_lookups_parse(TALLOC_CTX *ctx, void *out, void *parent, CONF_ITEM *ci, conf_parser_t const *rule);
 
static int num_networks_parse(TALLOC_CTX *ctx, void *out, void *parent, CONF_ITEM *ci, conf_parser_t const *rule);
static int num_workers_parse(TALLOC_CTX *ctx, void *out, void *parent, CONF_ITEM *ci, conf_parser_t const *rule);
static int num_workers_dflt(CONF_PAIR **out, void *parent, CONF_SECTION *cs, fr_token_t quote, conf_parser_t const *rule);
 
static int lib_dir_on_read(TALLOC_CTX *ctx, void *out, void *parent, CONF_ITEM *ci, conf_parser_t const *rule);
 
static int talloc_pool_size_parse(TALLOC_CTX *ctx, void *out, void *parent, CONF_ITEM *ci, conf_parser_t const *rule);
 
static int max_request_time_parse(TALLOC_CTX *ctx, void *out, void *parent, CONF_ITEM *ci, conf_parser_t const *rule);
 
static int name_parse(TALLOC_CTX *ctx, void *out, void *parent, CONF_ITEM *ci, conf_parser_t const *rule);
 
/*
 *      Log destinations
 */
static const conf_parser_t initial_log_config[] = {
        { FR_CONF_OFFSET("destination", main_config_t, log_dest), .dflt = "file" },
        { FR_CONF_OFFSET("syslog_facility", main_config_t, syslog_facility), .dflt = "daemon",
                .func = cf_table_parse_int,
                        .uctx = &(cf_table_parse_ctx_t){
                                .table = syslog_facility_table,
                                .len = &syslog_facility_table_len
                        }
                },
        { FR_CONF_OFFSET("local_state_dir", main_config_t, local_state_dir), .dflt = "${prefix}/var"},
        { FR_CONF_OFFSET("logdir", main_config_t, log_dir), .dflt = "${local_state_dir}/log"},
        { FR_CONF_OFFSET("file", main_config_t, log_file), .dflt = "${logdir}/radius.log" },
        { FR_CONF_OFFSET("suppress_secrets", main_config_t, suppress_secrets), .dflt = "no" },
        CONF_PARSER_TERMINATOR
};
 
/*
 *      Basic configuration for the server.
 */
static const conf_parser_t initial_server_config[] = {
        { FR_CONF_POINTER("log", 0, CONF_FLAG_SUBSECTION, NULL), .subcs = (void const *) initial_log_config },
 
        CONF_PARSER_TERMINATOR
};
 
/*
 *      Basic configuration for the server.
 */
static const conf_parser_t lib_dir_on_read_config[] = {
        { FR_CONF_OFFSET("prefix", main_config_t, prefix), .dflt = "/usr/local" },
 
        { FR_CONF_OFFSET("use_utc", main_config_t, log_dates_utc) },
        { FR_CONF_OFFSET_IS_SET("timestamp", FR_TYPE_BOOL, 0, main_config_t, log_timestamp) },
 
        { FR_CONF_OFFSET("libdir", main_config_t, lib_dir), .dflt = "${prefix}/lib",
          .on_read = lib_dir_on_read },
 
        CONF_PARSER_TERMINATOR
};
 
/**********************************************************************
 *
 *      Now that we've parsed the log destination, AND the security
 *      items, we can parse the rest of the configuration items.
 *
 **********************************************************************/
static const conf_parser_t log_config[] = {
        { FR_CONF_OFFSET("colourise", main_config_t, do_colourise) },
        { FR_CONF_OFFSET("line_number", main_config_t, log_line_number) },
        { FR_CONF_OFFSET("timestamp", main_config_t, log_timestamp) },
        { FR_CONF_OFFSET("use_utc", main_config_t, log_dates_utc) },
        CONF_PARSER_TERMINATOR
};
 
 
static const conf_parser_t resources[] = {
        /*
         *      Don't set a default here.  It's set in the code, below.  This means that
         *      the config item will *not* get printed out in debug mode, so that no one knows
         *      it exists.
         */
        { FR_CONF_OFFSET_TYPE_FLAGS("talloc_pool_size", FR_TYPE_SIZE, CONF_FLAG_HIDDEN, main_config_t, talloc_pool_size), .func = talloc_pool_size_parse },                     /* DO NOT SET DEFAULT */
        { FR_CONF_OFFSET_FLAGS("talloc_memory_report", CONF_FLAG_HIDDEN, main_config_t, talloc_memory_report) },                                                /* DO NOT SET DEFAULT */
        CONF_PARSER_TERMINATOR
};
 
static const conf_parser_t thread_config[] = {
        { FR_CONF_OFFSET("num_networks", main_config_t, max_networks), .dflt = STRINGIFY(1),
          .func = num_networks_parse },
        { FR_CONF_OFFSET("num_workers", main_config_t, max_workers), .dflt = STRINGIFY(0),
          .func = num_workers_parse, .dflt_func = num_workers_dflt },
 
        { FR_CONF_OFFSET_TYPE_FLAGS("stats_interval", FR_TYPE_TIME_DELTA, CONF_FLAG_HIDDEN, main_config_t, stats_interval) },
 
#ifdef WITH_TLS
        { FR_CONF_OFFSET_TYPE_FLAGS("openssl_async_pool_init", FR_TYPE_SIZE, 0, main_config_t, openssl_async_pool_init), .dflt = "64" },
        { FR_CONF_OFFSET_TYPE_FLAGS("openssl_async_pool_max", FR_TYPE_SIZE, 0, main_config_t, openssl_async_pool_max), .dflt = "1024" },
#endif
 
        CONF_PARSER_TERMINATOR
};
 
/*
 *      Migration configuration.
 */
extern bool tmpl_require_enum_prefix;
 
static const conf_parser_t migrate_config[] = {
        { FR_CONF_OFFSET_FLAGS("rewrite_update", CONF_FLAG_HIDDEN, main_config_t, rewrite_update) },
        { FR_CONF_OFFSET_FLAGS("forbid_update", CONF_FLAG_HIDDEN, main_config_t, forbid_update) },
 
        /*
         *      Do not add tmpl_require_enum_prefix here, as it is
         *      parsed too late to affect anything.  It must be passed
         *      as a command-line option via
         *
         *              -S v3_enum_names=yes
         */
 
        CONF_PARSER_TERMINATOR
};
 
#ifndef NDEBUG
/*
 *      Migration configuration.
 */
static const conf_parser_t interpret_config[] = {
        { FR_CONF_OFFSET_FLAGS("countup_instructions", CONF_FLAG_HIDDEN, main_config_t, ins_countup) },
        { FR_CONF_OFFSET_FLAGS("max_instructions", CONF_FLAG_HIDDEN, main_config_t, ins_max) },
        CONF_PARSER_TERMINATOR
};
#endif
 
static const conf_parser_t server_config[] = {
        /*
         *      FIXME: 'prefix' is the ONLY one which should be
         *      configured at compile time.  Hard-coding it here is
         *      bad.  It will be cleaned up once we clean up the
         *      hard-coded defines for the locations of the various
         *      files.
         */
        { FR_CONF_OFFSET("prefix", main_config_t, prefix), .dflt = "/usr/local" },
        { FR_CONF_OFFSET("local_state_dir", main_config_t, local_state_dir), .dflt = "${prefix}/var"},
        { FR_CONF_OFFSET("sbin_dir", main_config_t, sbin_dir), .dflt = "${prefix}/sbin"},
        { FR_CONF_OFFSET("logdir", main_config_t, log_dir), .dflt = "${local_state_dir}/log"},
        { FR_CONF_OFFSET("run_dir", main_config_t, run_dir), .dflt = "${local_state_dir}/run/${name}"},
        { FR_CONF_OFFSET("radacctdir", main_config_t, radacct_dir), .dflt = "${logdir}/radacct" },
        { FR_CONF_OFFSET("panic_action", main_config_t, panic_action) },
        { FR_CONF_OFFSET("reverse_lookups", main_config_t, reverse_lookups), .dflt = "no", .func = reverse_lookups_parse },
        { FR_CONF_OFFSET("hostname_lookups", main_config_t, hostname_lookups), .dflt = "yes", .func = hostname_lookups_parse },
        { FR_CONF_OFFSET("max_request_time", main_config_t, max_request_time), .dflt = STRINGIFY(MAX_REQUEST_TIME), .func = max_request_time_parse },
        { FR_CONF_OFFSET("pidfile", main_config_t, pid_file), .dflt = "${run_dir}/radiusd.pid"},
 
        { FR_CONF_OFFSET_FLAGS("debug_level", CONF_FLAG_HIDDEN, main_config_t, debug_level), .dflt = "0" },
        { FR_CONF_OFFSET("max_requests", main_config_t, max_requests), .dflt = "0" },
 
        { FR_CONF_POINTER("log", 0, CONF_FLAG_SUBSECTION, NULL), .subcs = (void const *) log_config },
 
        { FR_CONF_POINTER("resources", 0, CONF_FLAG_SUBSECTION, NULL), .subcs = (void const *) resources },
 
        { FR_CONF_POINTER("thread", 0, CONF_FLAG_SUBSECTION, NULL), .subcs = (void const *) thread_config, .name2 = CF_IDENT_ANY },
 
        { FR_CONF_POINTER("migrate", 0, CONF_FLAG_SUBSECTION, NULL), .subcs = (void const *) migrate_config, .name2 = CF_IDENT_ANY },
 
#ifndef NDEBUG
        { FR_CONF_POINTER("interpret", 0, CONF_FLAG_SUBSECTION, NULL), .subcs = (void const *) interpret_config, .name2 = CF_IDENT_ANY },
#endif
 
        CONF_PARSER_TERMINATOR
};
 
 
/**********************************************************************
 *
 *      The next few items are here to allow for switching of users
 *      while still opening the various output files with the correct
 *      permission.
 *
 *      It's rare (or impossible) to have parse errors for these
 *      configuration items, so we don't worry too much about that.
 *      In contrast, when we parse the rest of the configuration, we
 *      CAN get parse errors.  We want THOSE parse errors to go to the
 *      log file, and we want the log file to have the correct
 *      permissions.
 *
 **********************************************************************/
static const conf_parser_t security_config[] = {
#ifdef HAVE_SETUID
        { FR_CONF_OFFSET_IS_SET("user", FR_TYPE_VOID, 0, main_config_t, uid), .func = cf_parse_uid },
        { FR_CONF_OFFSET_IS_SET("group", FR_TYPE_VOID, 0, main_config_t, gid), .func = cf_parse_gid },
#endif
        { FR_CONF_OFFSET("chroot", main_config_t, chroot_dir) },
        { FR_CONF_OFFSET("allow_core_dumps", main_config_t, allow_core_dumps), .dflt = "no" },
 
#ifdef ENABLE_OPENSSL_VERSION_CHECK
        { FR_CONF_OFFSET("allow_vulnerable_openssl", main_config_t, allow_vulnerable_openssl), .dflt = "no" },
#endif
 
#ifdef WITH_TLS
        { FR_CONF_OFFSET_IS_SET("openssl_fips_mode", FR_TYPE_BOOL, 0, main_config_t, openssl_fips_mode), .dflt = "no" },
#endif
 
        CONF_PARSER_TERMINATOR
};
 
static const conf_parser_t switch_users_config[] = {
        { FR_CONF_POINTER("security", 0, CONF_FLAG_SUBSECTION, NULL), .subcs = (void const *) security_config },
 
        { FR_CONF_OFFSET("name", main_config_t, name), .func = name_parse },                                                    /* DO NOT SET DEFAULT */
 
        { FR_CONF_OFFSET("prefix", main_config_t, prefix), .dflt = "/usr/local" },
        { FR_CONF_OFFSET("local_state_dir", main_config_t, local_state_dir), .dflt = "${prefix}/var"},
 
        { FR_CONF_OFFSET("run_dir", main_config_t, run_dir), .dflt = "${local_state_dir}/run/${name}"},
 
        /*
         *      For backwards compatibility.
         */
#ifdef HAVE_SETUID
        { FR_CONF_DEPRECATED("user", main_config_t, uid) },
        { FR_CONF_DEPRECATED("group", main_config_t, gid) },
#endif
        { FR_CONF_DEPRECATED("chroot", main_config_t, NULL) },
        { FR_CONF_DEPRECATED("allow_core_dumps", main_config_t, NULL) },
        CONF_PARSER_TERMINATOR
};
 
static int reverse_lookups_parse(TALLOC_CTX *ctx, void *out, void *parent,
                                 CONF_ITEM *ci, conf_parser_t const *rule)
{
        int     ret;
 
        if ((ret = cf_pair_parse_value(ctx, out, parent, ci, rule)) < 0) return ret;
 
        memcpy(&fr_reverse_lookups, out, sizeof(fr_reverse_lookups));
 
        return 0;
}
 
static int hostname_lookups_parse(TALLOC_CTX *ctx, void *out, void *parent,
                                  CONF_ITEM *ci, conf_parser_t const *rule)
{
        int     ret;
 
        if ((ret = cf_pair_parse_value(ctx, out, parent, ci, rule)) < 0) return ret;
 
        memcpy(&fr_hostname_lookups, out, sizeof(fr_hostname_lookups));
 
        return 0;
}
 
static int talloc_pool_size_parse(TALLOC_CTX *ctx, void *out, void *parent,
                                  CONF_ITEM *ci, conf_parser_t const *rule)
{
        int     ret;
        size_t  value;
 
        if ((ret = cf_pair_parse_value(ctx, out, parent, ci, rule)) < 0) return ret;
 
        memcpy(&value, out, sizeof(value));
 
        FR_SIZE_BOUND_CHECK("resources.talloc_pool_size", value, >=, (size_t)(2 * 1024));
        FR_SIZE_BOUND_CHECK("resources.talloc_pool_size", value, <=, (size_t)(1024 * 1024));
 
        memcpy(out, &value, sizeof(value));
 
        return 0;
}
 
static int max_request_time_parse(TALLOC_CTX *ctx, void *out, void *parent,
                                  CONF_ITEM *ci, conf_parser_t const *rule)
{
        int             ret;
        fr_time_delta_t value;
 
        if ((ret = cf_pair_parse_value(ctx, out, parent, ci, rule)) < 0) return ret;
 
        memcpy(&value, out, sizeof(value));
 
        FR_TIME_DELTA_BOUND_CHECK("max_request_time", value, >=, fr_time_delta_from_sec(5));
        FR_TIME_DELTA_BOUND_CHECK("max_request_time", value, <=, fr_time_delta_from_sec(120));
 
        memcpy(out, &value, sizeof(value));
 
        return 0;
}
 
static int lib_dir_on_read(UNUSED TALLOC_CTX *ctx, UNUSED void *out, UNUSED void *parent,
                         CONF_ITEM *ci, UNUSED conf_parser_t const *rule)
{
        CONF_PAIR       *cp = cf_item_to_pair(ci);
        char const      *value;
 
        fr_assert(main_config != NULL);
        value = cf_pair_value(cp);
        if (value) {
                main_config_t *config;
 
                memcpy(&config, &main_config, sizeof(config)); /* const issues */
 
                config->lib_dir = value;
        }
 
        /*
         *      Initialize the DL infrastructure, which is used by the
         *      config file parser.  And also add in the search path.
         */
        if (!dl_module_loader_init(main_config->lib_dir)) {
                cf_log_perr(ci, "Failed initializing 'lib_dir'");
                return -1;
        }
 
        return 0;
}
 
/** Configured server name takes precedence over default values
 *
 */
static int name_parse(TALLOC_CTX *ctx, void *out, void *parent,
                      CONF_ITEM *ci, conf_parser_t const *rule)
{
        main_config_t *config = parent;
 
        if (*((char **)out)) {
                if (config->overwrite_config_name) return 0;            /* Don't change */
 
                talloc_free(*((char **)out));                           /* Free existing buffer */
        }
 
        return cf_pair_parse_value(ctx, out, parent, ci, rule);         /* Set new value */
}
 
static int num_networks_parse(TALLOC_CTX *ctx, void *out, void *parent,
                              CONF_ITEM *ci, conf_parser_t const *rule)
{
        int             ret;
        uint32_t        value;
 
        if ((ret = cf_pair_parse_value(ctx, out, parent, ci, rule)) < 0) return ret;
 
        memcpy(&value, out, sizeof(value));
 
        FR_INTEGER_BOUND_CHECK("thread.num_networks", value, ==, 1);
 
        memcpy(out, &value, sizeof(value));
 
        return 0;
}
 
static inline CC_HINT(always_inline)
uint32_t num_workers_auto(main_config_t *conf, CONF_ITEM *parent)
{
        uint32_t        value;
 
        value = fr_hw_num_cores_active();
        if (value == 0) {
                cf_log_pwarn(parent, "Failed retrieving core count, defaulting to 1 worker");
                value = 1;
        }
 
        /*
         *      If we've got more than four times
         *      the number of cores as we have
         *      networks, then set the number of
         *      workers to the number of cores
         *      minus networks.
         *
         *      This ensures at a least a 4:1
         *      ratio of workers to networks,
         *      which seems like a sensible ratio.
         */
        else if (value > (conf->max_networks * 4)) {
                value -= conf->max_networks;
        }
 
        return value;
}
 
static int num_workers_parse(TALLOC_CTX *ctx, void *out, void *parent, CONF_ITEM *ci, conf_parser_t const *rule)
{
        int             ret;
        uint32_t        value;
        main_config_t   *conf = parent;
 
        if ((ret = cf_pair_parse_value(ctx, out, parent, ci, rule)) < 0) return ret;
 
        memcpy(&value, out, sizeof(value));
 
        if (value == 0) value = num_workers_auto(conf, ci);
 
        /*
         *      If no value is specified, try and
         *      discover it automatically.
         */
        FR_INTEGER_BOUND_CHECK("thread.num_workers", value, >=, 1);
        FR_INTEGER_BOUND_CHECK("thread.num_workers", value, <=, 128);
 
        memcpy(out, &value, sizeof(value));
 
        return 0;
}
 
static int num_workers_dflt(CONF_PAIR **out, void *parent, CONF_SECTION *cs, fr_token_t quote, conf_parser_t const *rule)
{
        char            *strvalue;
        uint32_t        value;
        main_config_t   *conf = parent;
 
        value = num_workers_auto(conf, cf_section_to_item(cs));
        strvalue = talloc_asprintf(NULL, "%u", value);
        *out = cf_pair_alloc(cs, rule->name1, strvalue, T_OP_EQ, T_BARE_WORD, quote);
        talloc_free(strvalue);
 
        /*
         *      Otherwise just create as many
         *      workers as we have cores.
         */
        cf_log_info(cs, "Dynamically determined thread.workers = %u", value);
 
        return 0;
}
 
static int xlat_config_escape(UNUSED request_t *request, fr_value_box_t *vb, UNUSED void *uctx)
{
        static char const       disallowed[] = "%{}\\'\"`";
        size_t                  outmax = vb->vb_length * 3;
        size_t                  outlen = 0;
        char                    escaped[outmax + 1];
        char const              *in, *end;
        char                    *out = escaped;
 
        fr_assert(vb->type == FR_TYPE_STRING);
        in = vb->vb_strvalue;
        end = in + vb->vb_length;
 
        do {
                /*
                 *      Non-printable characters get replaced with their
                 *      mime-encoded equivalents.
                 */
                if ((in[0] < 32)) {
                        snprintf(out, outlen, "=%02X", (unsigned char) in[0]);
                        out += 3;
                        outlen += 3;
                        continue;
                }
                if (strchr(disallowed, *in) != NULL) {
                        out[0] = '\\';
                        out[1] = *in;
                        out += 2;
                        outlen += 2;
                        continue;
                }
                /*
                 *      Allowed character.
                 */
                *out = *in;
                out++;
                outlen++;
        } while (++in < end);
        *out = '\0';
 
        /*
         *      If the output length is greater than the input length
         *      something has been escaped - replace the original string
         */
        if (outlen > vb->vb_length) {
                char    *outbuff;
                if (fr_value_box_bstr_realloc(vb, &outbuff, vb, outlen) < 0) return -1;
                memcpy(outbuff, escaped, outlen);
        }
 
        return 0;
 
}
 
static xlat_arg_parser_t const xlat_config_args[] = {
        { .required = true, .concat = true, .type = FR_TYPE_STRING, .always_escape = true, .func = xlat_config_escape },
        XLAT_ARG_PARSER_TERMINATOR
};
 
/** xlat to get config values
 *
@verbatim
%config(section.subsection.attribute)
@endverbatim
 *
 * @ingroup xlat_functions
 */
static xlat_action_t xlat_config(TALLOC_CTX *ctx, fr_dcursor_t *out,
                                 UNUSED xlat_ctx_t const *xctx,
                                 request_t *request, fr_value_box_list_t *in)
{
        char const      *value;
        CONF_PAIR       *cp;
        CONF_ITEM       *ci;
        fr_value_box_t  *in_head = fr_value_box_list_head(in);
        fr_value_box_t  *vb;
 
        ci = cf_reference_item(main_config->root_cs, main_config->root_cs, in_head->vb_strvalue);
        if (!ci || !cf_item_is_pair(ci)) {
                REDEBUG("Config item \"%pV\" does not exist", in_head);
                return XLAT_ACTION_FAIL;
        }
 
        cp = cf_item_to_pair(ci);
 
        value = cf_pair_value(cp);
        if (!value) return XLAT_ACTION_DONE;
 
        MEM(vb = fr_value_box_alloc_null(ctx));
        fr_value_box_bstrndup(vb, vb, NULL, value, strlen(value), false);
        fr_dcursor_append(out, vb);
 
        return XLAT_ACTION_DONE;
}
 
#ifdef HAVE_SETUID
static int mkdir_chown(int fd, char const *path, void *uctx)
{
        main_config_t *config = uctx;
        int ret = 0;
 
        if ((config->server_uid != (uid_t)-1) || (config->server_gid != (gid_t)-1)) {
                rad_suid_up();
                ret = fchown(fd, config->server_uid, config->server_gid);
                if (ret < 0) fr_strerror_printf("Failed changing ownership on directory \"%s\": %s",
                                                path, fr_syserror(errno));
                rad_suid_down();
        }
 
        return ret;
}
/*
 *  Do chroot, if requested.
 *
 *  Switch UID and GID to what is specified in the config file
 */
static int switch_users(main_config_t *config, CONF_SECTION *cs)
{
        bool do_suid = false;
        bool do_sgid = false;
 
        /*
         *      Get the current maximum for core files.  Do this
         *      before anything else so as to ensure it's properly
         *      initialized.
         */
        if (fr_set_dumpable_init() < 0) {
                fr_perror("%s", config->name);
                return -1;
        }
 
        if (cf_section_rules_push(cs, switch_users_config) < 0) {
                fprintf(stderr, "%s: Error: Failed pushing parse rules for user/group information.\n",
                        config->name);
                return -1;
        }
 
        DEBUG("Parsing security rules to bootstrap UID / GID / chroot / etc.");
        if (cf_section_parse(config, config, cs) < 0) {
                fprintf(stderr, "%s: Error: Failed to parse user/group information.\n",
                        config->name);
                return -1;
        }
 
        /*
         *      Don't do chroot/setuid/setgid if we're in debugging
         *      as non-root.
         */
        if (DEBUG_ENABLED && (getuid() != 0)) {
                WARN("Ignoring configured UID / GID / chroot as we're running in debug mode");
                return 0;
        }
#ifdef HAVE_GRP_H
        /*
         *      Get the correct GID for the server.
         */
        config->server_gid = getgid();
        if (config->gid_is_set && (config->server_gid != config->gid)) {
                config->server_gid = config->gid;
                do_sgid = true;
        }
#endif
 
        /*
         *      Get the correct UID for the server.
         */
        config->server_uid = getuid();
        if (config->uid_is_set && (config->server_uid != config->uid)) {
                /*
                 *      We're not the correct user.  Go set that.
                 */
                config->server_uid = config->uid;
                do_suid = true;
 
#ifdef HAVE_INITGROUPS
                {
                        struct passwd *user;
 
                        if (fr_perm_getpwuid(config, &user, config->uid) < 0) {
                                fprintf(stderr, "%s: Failed resolving UID %i: %s\n",
                                        config->name, (int)config->uid, fr_syserror(errno));
                                return -1;
                        }
 
                        if (initgroups(user->pw_name, config->server_gid) < 0) {
                                fprintf(stderr, "%s: Cannot initialize supplementary group list "
                                        "for user %s: %s\n",
                                        config->name, user->pw_name, fr_syserror(errno));
                                talloc_free(user);
                                return -1;
                        }
 
                        talloc_free(user);
                }
#endif
        }
 
        /*
         *      Set the user/group we're going to use
         *      to check read permissions on configuration files.
         */
        cf_file_check_user(config->server_uid ? config->server_uid : (uid_t)-1,
                           config->server_gid ? config->server_gid : (gid_t)-1);
 
        /*
         *      Do chroot BEFORE changing UIDs.
         */
        if (config->chroot_dir) {
                if (chroot(config->chroot_dir) < 0) {
                        fprintf(stderr, "%s: Failed to perform chroot %s: %s",
                                config->name, config->chroot_dir, fr_syserror(errno));
                        return -1;
                }
 
                /*
                 *      Note that we leave chdir alone.  It may be
                 *      OUTSIDE of the root.  This allows us to read
                 *      the configuration from "-d ./etc/raddb", with
                 *      the chroot as "./chroot/" for example.  After
                 *      the server has been loaded, it does a "cd
                 *      ${logdir}" below, so that core files (if any)
                 *      go to a logging directory.
                 *
                 *      This also allows the configuration of the
                 *      server to be outside of the chroot.  If the
                 *      server is statically linked, then the only
                 *      things needed inside of the chroot are the
                 *      logging directories.
                 */
        }
 
#ifdef HAVE_GRP_H
        /*
         *      Set the GID.  Don't bother checking it.
         */
        if (do_sgid) {
                if (setgid(config->server_gid) < 0) {
                        struct group *group;
 
                        if (fr_perm_getgrgid(config, &group, config->gid) < 0) {
                                        fprintf(stderr, "%s: Failed resolving GID %i: %s\n",
                                                config->name, (int)config->gid, fr_syserror(errno));
                                        return -1;
                        }
 
                        fprintf(stderr, "%s: Failed setting group to %s: %s",
                                config->name, group->gr_name, fr_syserror(errno));
                        return -1;
                }
        }
#endif
 
        /*
         *      The directories for PID files and logs must exist.  We
         *      need to create them if we're told to write files to
         *      those directories.
         *
         *      Because this creation is new in 3.0.9, it's a soft
         *      fail.
         *
         */
        if (config->write_pid) {
                /*
                 *      Control sockets may be accessible by users
                 *      other than the freeradius user, so we need
                 *      to allow 'other' to traverse the run
                 *      directory.
                 *
                 *      The freeradius user should be the only one
                 *      allowed to write to this directory however.
                 */
                if (fr_mkdir(NULL, config->run_dir, -1, 0755, mkdir_chown, config) < 0) {
                        WARN("Failed creating run_dir %s: %s", config->run_dir, fr_syserror(errno));
                }
        }
 
        if ((default_log.dst == L_DST_FILES) && config->log_dir) {
                /*
                 *      Every other Linux daemon allows 'other'
                 *      to traverse the log directory.  That doesn't
                 *      mean the actual files should be world
                 *      readable.
                 */
                if (fr_mkdir(NULL, config->log_dir, -1, 0755, mkdir_chown, config) < 0) {
                        WARN("Failed creating log_dir %s: %s", config->log_dir, fr_syserror(errno));
                }
        }
 
        /*
         *      If we don't already have a log file open, open one
         *      now.  We may not have been logging anything yet.  The
         *      server normally starts up fairly quietly.
         */
        if ((default_log.dst == L_DST_FILES) &&
            (default_log.fd < 0)) {
                default_log.fd = open(config->log_file,
                                      O_WRONLY | O_APPEND | O_CREAT, 0640);
                if (default_log.fd < 0) {
                        fprintf(stderr, "%s: Failed to open log file %s: %s\n",
                                config->name, config->log_file, fr_syserror(errno));
                        return -1;
                }
        }
 
        /*
         *      If we need to change UID, ensure that the log files
         *      have the correct owner && group.
         *
         *      We have to do this because some log files MAY already
         *      have been written as root.  We need to change them to
         *      have the correct ownership before proceeding.
         */
        if ((do_suid || do_sgid) &&
            (default_log.dst == L_DST_FILES)) {
                if (fchown(default_log.fd, config->server_uid, config->server_gid) < 0) {
                        fprintf(stderr, "%s: Cannot change ownership of log file %s: %s\n",
                                config->name, config->log_file, fr_syserror(errno));
                        return -1;
                }
        }
 
        /*
         *      Once we're done with all of the privileged work,
         *      permanently change the UID.
         */
        if (do_suid) {
                rad_suid_set_down_uid(config->server_uid);
                rad_suid_down();
        }
 
        return 0;
}
#endif  /* HAVE_SETUID */
 
 
/** Set the server name
 *
 * @note Will only add pair if one does not already exist
 *
 * @param[in] config            to alter.
 * @param[in] name              to set e.g. "radiusd".
 * @param[in] overwrite_config  replace any CONF_PAIRs with this value.
 */
void main_config_name_set_default(main_config_t *config, char const *name, bool overwrite_config)
{
        if (config->name) {
                char *p;
 
                memcpy(&p, &config->name, sizeof(p));
                talloc_free(p);
                config->name = NULL;
        }
        if (name) config->name = talloc_typed_strdup(config, name);
 
        config->overwrite_config_name = overwrite_config;
}
 
/** Set the global radius config directory.
 *
 * @param[in] config    to alter.
 * @param[in] name      to set as dir root e.g. /usr/local/etc/raddb.
 */
void main_config_raddb_dir_set(main_config_t *config, char const *name)
{
        if (config->raddb_dir) {
                talloc_const_free(config->raddb_dir);
                config->raddb_dir = NULL;
        }
        if (name) config->raddb_dir = talloc_typed_strdup(config, name);
}
 
/** Clean up the semaphore when the main config is freed
 *
 * This helps with permissions issues if the user is switching between
 * running the process under something like systemd and running it under
 * debug mode.
 */
void main_config_exclusive_proc_done(
#ifndef HAVE_SEMAPHORES
                                      UNUSED
#endif
                                      main_config_t const *config)
{
#ifdef HAVE_SEMAPHORES
        if (config->multi_proc_sem_id >= 0) fr_sem_close(config->multi_proc_sem_id, NULL);
#endif
}
 
/** Increment the semaphore in the child process so that it's not released when the parent exits
 *
 * @param[in] config    specifying the path to the main config file.
 * @return
 *      - 0 on success.
 *      - -1 on failure.
 */
int main_config_exclusive_proc_child(
#ifndef HAVE_SEMAPHORES
                                      UNUSED
#endif
                                      main_config_t const *config)
{
#ifdef HAVE_SEMAPHORES
        return fr_sem_take(config->multi_proc_sem_id, config->multi_proc_sem_path, true);
#else
        return 0;
#endif
}
 
/** Check to see if we're the only process using this configuration file (or PID file if specified)
 *
 * @param[in] config    specifying the path to the main config file.
 * @return
 *      - 1 if another process is running with this config file
 *      - 0 if no other process is running with this config file.
 *      - -1 on error.
 */
int main_config_exclusive_proc(main_config_t *config)
{
        char *path;
 
#ifdef HAVE_SEMAPHORES
        int sem_id;
#endif
 
        int ret = 0;
        FILE *fp = NULL;
        static bool sem_initd;
 
        if (unlikely(sem_initd)) return 0;
 
        if (config->write_pid) {
                fr_assert(config->pid_file);
                fp = fopen(config->pid_file, "w");
                if (!fp) {
                        fr_strerror_printf("Refusing to start - Failed creating PID file at \"%s\" - %s",
                                           config->pid_file, fr_syserror(errno));
                        return -1;
                }
                MEM(path = talloc_typed_strdup(config, config->pid_file));
        }  else {
                MEM(path = talloc_asprintf(config, "%s/%s.conf", config->raddb_dir, config->name));
        }
 
#ifdef HAVE_SEMAPHORES
        sem_id = fr_sem_get(path, 0,
                            main_config->uid_is_set ? main_config->uid : geteuid(),
                            main_config->gid_is_set ? main_config->gid : getegid(),
                            true, false);
        if (sem_id < 0) {
                talloc_free(path);
                ret = -1;
                goto done;
        }
 
        config->multi_proc_sem_id = -1;
 
        ret = fr_sem_wait(sem_id, path, true, true);
        switch (ret) {
        case 0: /* we have the semaphore */
                talloc_free(config->multi_proc_sem_path);       /* Allow this to be called multiple times */
                config->multi_proc_sem_id = sem_id;
                config->multi_proc_sem_path = path;
                sem_initd = true;
                break;
 
        case 1: /* another process has the semaphore */
        {
                pid_t pid;
 
                fr_sem_pid(&pid, sem_id);
                fr_strerror_printf("Refusing to start - PID %u already running with \"%s\"", pid, path);
                talloc_free(path);
        }
                break;
 
        default:
                talloc_free(path);
                break;
        }
done:
#endif
        if (fp != NULL) fclose(fp);
 
        return ret;
}
 
/** Set the global dictionary directory.
 *
 * @param[in] config    to alter.
 * @param[in] name      to set as dict dir root e.g. /usr/local/share/freeradius.
 */
void main_config_dict_dir_set(main_config_t *config, char const *name)
{
        if (config->dict_dir) {
                talloc_const_free(config->dict_dir);
                config->dict_dir = NULL;
        }
        if (name) config->dict_dir = talloc_typed_strdup(config, name);
}
 
/** Allocate a main_config_t struct, setting defaults
 *
 */
main_config_t *main_config_alloc(TALLOC_CTX *ctx)
{
        main_config_t *config;
 
        config = talloc_zero(ctx, main_config_t);
        if (!config) {
                fr_strerror_const("Failed allocating main config");
                return NULL;
        }
 
        /*
         *      Set the defaults from compile time arguments
         *      these can be overridden later on the command line.
         */
        main_config_raddb_dir_set(config, RADDBDIR);
        main_config_dict_dir_set(config, DICTDIR);
 
        main_config = config;
 
        return config;
}
 
static int _dlhandle_free(void **dl_handle)
{
        dlclose(*dl_handle);
        return 0;
}
 
/*
 *      Read config files.
 *
 *      This function can ONLY be called from the main server process.
 */
int main_config_init(main_config_t *config)
{
        char const      *p = NULL;
        CONF_SECTION    *cs = NULL, *subcs;
        struct stat     statbuf;
        bool            can_colourise = false;
        char            buffer[1024];
        xlat_t          *xlat;
 
        /*
         *      Initialize the xlats before we load the configuration files,
         *      so that we can later call xlat_func_register().
         */
        xlat_func_init();
 
        if (stat(config->raddb_dir, &statbuf) < 0) {
                ERROR("Error checking raddb_dir \"%s\": %s", config->raddb_dir, fr_syserror(errno));
                return -1;
        }
 
#ifdef S_IWOTH
        if ((statbuf.st_mode & S_IWOTH) != 0) {
                ERROR("Configuration directory %s is globally writable. "
                      "Refusing to start due to insecure configuration", config->raddb_dir);
                return -1;
        }
#endif
 
#if 0 && defined(S_IROTH)
        if (statbuf.st_mode & S_IROTH != 0) {
                ERROR("Configuration directory %s is globally readable. "
                      "Refusing to start due to insecure configuration", config->raddb_dir);
                return -1;
        }
#endif
        INFO("Starting - reading configuration files ...");
 
        /*
         *      About sizeof(request_t) + sizeof(fr_packet_t) * 2 + sizeof(fr_pair_t) * 400
         *
         *      Which should be enough for many configurations.
         */
        config->talloc_pool_size = 8 * 1024; /* default */
 
        cs = cf_section_alloc(NULL, NULL, "main", NULL);
        if (!cs) return -1;
 
        /*
         *      Add a 'feature' subsection off the main config
         *      We check if it's defined first, as the user may
         *      have defined their own feature flags, or want
         *      to manually override the ones set by modules
         *      or the server.
         */
        subcs = cf_section_find(cs, "feature", NULL);
        if (!subcs) {
                subcs = cf_section_alloc(cs, cs, "feature", NULL);
                if (!subcs) {
                failure:
                        fr_dict_free(&config->dict, __FILE__);
                        talloc_free(cs);
                        return -1;
                }
        }
        dependency_features_init(subcs);
 
        if (fr_dict_internal_afrom_file(&config->dict, FR_DICTIONARY_INTERNAL_DIR, __FILE__) < 0) {
                PERROR("Failed reading internal dictionaries");
                goto failure;
        }
 
        /*
         *      Special-case things.  If the output is a TTY, AND
         *      we're debugging, colourise things.  This flag also
         *      removes the "Debug : " prefix from the log messages.
         */
        p = getenv("TERM");
        if (p && isatty(default_log.fd) && strstr(p, "xterm") && fr_debug_lvl) {
                can_colourise = default_log.colourise = true;
        } else {
                can_colourise = default_log.colourise = false;
        }
        default_log.line_number = config->log_line_number;
 
        /*
         *      Add a 'version' subsection off the main config
         *      We check if it's defined first, this is for
         *      backwards compatibility.
         */
        subcs = cf_section_find(cs, "version", NULL);
        if (!subcs) {
                subcs = cf_section_alloc(cs, cs, "version", NULL);
                if (!subcs) goto failure;
        }
        dependency_version_numbers_init(subcs);
 
        /*
         *      @todo - not quite done yet... these dictionaries have
         *      to be loaded from raddb_dir.  But the
         *      fr_dict_autoload_t has a base_dir pointer
         *      there... it's probably best to pass raddb_dir into
         *      fr_dict_autoload() and have it use that instead.
         *
         *      Once that's done, the proto_foo dictionaries SHOULD be
         *      autoloaded, AND loaded before the configuration files
         *      are read.
         *
         *      And then all of the modules have to be updated to use
         *      their local dict pointer, instead of NULL.
         */
        if (cf_section_rules_push(cs, lib_dir_on_read_config) < 0) goto failure;
        if (cf_section_rules_push(cs, virtual_servers_on_read_config) < 0) goto failure;
 
        /*
         *      Track the status of the configuration.
         */
        if (fr_debug_lvl) cf_md5_init();
 
        /* Read the configuration file */
        snprintf(buffer, sizeof(buffer), "%.200s/%.50s.conf", config->raddb_dir, config->name);
        if (cf_file_read(cs, buffer) < 0) {
                ERROR("Error reading or parsing %s", buffer);
                goto failure;
        }
 
        /*
         *      Do any fixups here that might be used in references
         */
        if (config->name) {
                CONF_PAIR *cp;
 
                cp = cf_pair_find(cs, "name");
                if (cp){
                        if (config->overwrite_config_name && (cf_pair_replace(cs, cp, config->name) < 0)) {
                                ERROR("Failed adding/replacing \"name\" config item");
                                goto failure;
                        }
                } else {
                        MEM(cp = cf_pair_alloc(cs, "name", config->name, T_OP_EQ, T_BARE_WORD, T_DOUBLE_QUOTED_STRING));
                }
        }
 
        if (cf_section_pass2(cs) < 0) goto failure;
 
        /*
         *      Parse environment variables first.
         */
        subcs = cf_section_find(cs, "ENV", NULL);
        if (subcs) {
                char const *attr, *value;
                CONF_PAIR *cp;
                CONF_ITEM *ci;
 
                for (ci = cf_item_next(subcs, NULL);
                     ci != NULL;
                     ci = cf_item_next(subcs, ci)) {
                        if (cf_item_is_data(ci)) continue;
 
                        if (!cf_item_is_pair(ci)) {
                                cf_log_err(ci, "Unexpected item in ENV section");
                                goto failure;
                        }
 
                        cp = cf_item_to_pair(ci);
                        if (cf_pair_operator(cp) != T_OP_EQ) {
                                cf_log_err(ci, "Invalid operator for item in ENV section");
                                goto failure;
                        }
 
                        attr = cf_pair_attr(cp);
                        value = cf_pair_value(cp);
                        if (!value) {
                                if (unsetenv(attr) < 0) {
                                        cf_log_err(ci, "Failed deleting environment variable %s: %s",
                                                   attr, fr_syserror(errno));
                                        goto failure;
                                }
                        } else {
                                void *handle;
                                void **handle_p;
 
                                if (setenv(attr, value, 1) < 0) {
                                        cf_log_err(ci, "Failed setting environment variable %s: %s",
                                                   attr, fr_syserror(errno));
                                        goto failure;
                                }
 
                                /*
                                 *      Hacks for LD_PRELOAD.
                                 */
                                if (strcmp(attr, "LD_PRELOAD") != 0) continue;
 
                                handle = dlopen(value, RTLD_NOW | RTLD_GLOBAL);
                                if (!handle) {
                                        cf_log_err(ci, "Failed loading library %s: %s", value, dlerror());
                                        goto failure;
                                }
 
                                /*
                                 *      Wrap the pointer, so we can set a destructor.
                                 */
                                MEM(handle_p = talloc(NULL, void *));
                                *handle_p = handle;
                                talloc_set_destructor(handle_p, _dlhandle_free);
                                (void) cf_data_add(subcs, handle_p, value, true);
                        }
                } /* loop over pairs in ENV */
        } /* there's an ENV subsection */
 
        /*
         *      Parse log section of main config.
         */
        if (cf_section_rules_push(cs, initial_server_config) < 0) {
                fprintf(stderr, "%s: Error: Failed pushing rules for log {} section.\n",
                        config->name);
                goto failure;
        }
 
        DEBUG("Parsing initial logging configuration.");
        if (cf_section_parse(config, config, cs) < 0) {
                fprintf(stderr, "%s: Error: Failed to parse log{} section.\n",
                        config->name);
                goto failure;
        }
 
        /*
         *      If there was no log destination set on the command line,
         *      set it now.
         */
        if (default_log.dst == L_DST_NULL) {
                if (!config->log_dest) {
                        fprintf(stderr, "%s: Error: No log destination specified.\n",
                                config->name);
                        goto failure;
                }
 
                default_log.dst = fr_table_value_by_str(log_destination_table, config->log_dest, L_DST_NUM_DEST);
 
                switch (default_log.dst) {
                case L_DST_NUM_DEST:
                        fprintf(stderr, "%s: Error: Unknown log_destination %s\n",
                                config->name, config->log_dest);
                        goto failure;
 
#ifdef HAVE_SYSLOG_H
                case L_DST_SYSLOG:
                        /*
                         *      Call openlog only once, when the
                         *      program starts.
                         */
                        openlog(config->name, LOG_PID, config->syslog_facility);
                        break;
#endif
 
                case L_DST_FILES:
                        if (!config->log_file) {
                                fprintf(stderr, "%s: Error: Specified \"files\" as a log destination, but no log filename was given!\n",
                                        config->name);
                                goto failure;
                        }
                        default_log.file = config->log_file;
                        break;
 
                default:
                        break;
                }
        }
 
        /*
         *      Only set timestamp logging from the config file if no value was
         *      specified on the command line.
         */
        if (config->log_timestamp_is_set && (default_log.timestamp == L_TIMESTAMP_AUTO)) {
                default_log.timestamp = config->log_timestamp ? L_TIMESTAMP_ON : L_TIMESTAMP_OFF;
        }
 
#ifdef HAVE_SETUID
        /*
         *      Switch users as early as possible.
         */
        if (switch_users(config, cs) < 0) goto failure;
#endif
 
        /*
         *      This also clears the dumpable flag if core dumps
         *      aren't allowed.
         */
        if (fr_set_dumpable(config->allow_core_dumps) < 0) PERROR("Failed enabling core dumps");
        if (config->allow_core_dumps) INFO("Core dumps are enabled");
 
        /*
         *      This allows us to figure out where, relative to
         *      radiusd.conf, the other configuration files exist.
         */
        if (cf_section_rules_push(cs, server_config) < 0) goto failure;
        if (cf_section_rules_push(cs, virtual_servers_config) < 0) goto failure;
 
        DEBUG("Parsing main configuration");
        if (cf_section_parse(config, config, cs) < 0) goto failure;
 
        /*
         *      Reset the colourisation state.  The configuration
         *      files can disable colourisation if the terminal
         *      supports it.  The configuration files *cannot* enable
         *      colourisation if the terminal window doesn't support
         *      it.
         */
        if (can_colourise && !config->do_colourise) {
                default_log.colourise = false;
        }
 
        /*
         *      Starting the server, WITHOUT "-x" on the
         *      command-line: use whatever is in the config
         *      file.
         */
        if (fr_debug_lvl == 0) fr_debug_lvl = config->debug_level;
 
        INFO("Switching to configured log settings");
 
        /*
         *      Free the old configuration items, and replace them
         *      with the new ones.
         *
         *      Note that where possible, we do atomic switch-overs,
         *      to ensure that the pointers are always valid.
         */
        fr_assert(config->root_cs == NULL);
 
        /*
         *  Redirect stderr/stdout as appropriate.
         */
        if (log_global_init(&default_log, config->daemonize) < 0) {
                cf_log_err(cs, "Failed initializing logging");
                goto failure;
        }
 
        /*
         *      Load different logging destinations.
         */
        for (subcs = cf_section_find_next(cs, NULL, "log", CF_IDENT_ANY);
             subcs != NULL;
             subcs = cf_section_find_next(cs, subcs, "log", CF_IDENT_ANY)) {
                if (!cf_section_name2(subcs)) continue;
 
                if (log_parse_section(subcs) < 0) {
                        cf_log_err(subcs, "Failed parsing log section: %s", fr_strerror());
                        goto failure;
                }
        }
 
        DEBUG2("%s: #### Loading Clients ####", config->name);
        if (!client_list_parse_section(cs, 0, false)) goto failure;
 
        /*
         *      Register the %config(section.subsection) xlat function.
         */
        if (unlikely((xlat = xlat_func_register(NULL, "config", xlat_config, FR_TYPE_STRING)) == NULL)) goto failure;
        xlat_func_args_set(xlat, xlat_config_args);
        xlat_func_flags_set(xlat, XLAT_FUNC_FLAG_PURE);
 
        /*
         *      Ensure cwd is inside the chroot.
         */
        if (config->chroot_dir) {
                if (chdir(config->log_dir) < 0) {
                        ERROR("Failed to 'chdir %s' after chroot: %s", config->log_dir, fr_syserror(errno));
                        goto failure;
                }
        }
 
        config->root_cs = cs;   /* Do this last to avoid dangling pointers on error */
 
        /* Clear any unprocessed configuration errors */
        fr_strerror_clear();
 
        return 0;
}
 
/*
 *      Free the configuration.  Called only when the server is exiting.
 */
int main_config_free(main_config_t **config)
{
        /*
         *  Frees request specific logging resources which is OK
         *  because all the requests will have been stopped.
         */
        log_global_free();
 
        /*
         *      Clean up the configuration data
         *      structures.
         */
        client_list_free();
 
        /*
         *      Frees current config and any previous configs.
         */
        TALLOC_FREE((*config)->root_cs);
        fr_dict_free(&(*config)->dict, __FILE__);
        TALLOC_FREE(*config);
 
        return 0;
}
 
void hup_logfile(main_config_t *config)
{
        int fd, old_fd;
 
        if (default_log.dst != L_DST_FILES) return;
 
        fd = open(config->log_file, O_WRONLY | O_APPEND | O_CREAT, 0640);
        if (fd >= 0) {
                /*
                 *      Atomic swap. We'd like to keep the old
                 *      FD around so that callers don't
                 *      suddenly find the FD closed, and the
                 *      writes go nowhere.  But that's hard to
                 *      do.  So... we have the case where a
                 *      log message *might* be lost on HUP.
                 */
                old_fd = default_log.fd;
                default_log.fd = fd;
                close(old_fd);
        }
}
 
void main_config_hup(main_config_t *config)
{
        fr_time_t               when;
 
        static fr_time_t        last_hup = fr_time_wrap(0);
 
        /*
         *      Re-open the log file.  If we can't, then keep logging
         *      to the old log file.
         *
         *      The "open log file" code is here rather than in log.c,
         *      because it makes that function MUCH simpler.
         */
        hup_logfile(config);
 
        /*
         *      Only check the config files every few seconds.
         */
        when = fr_time();
        if (fr_time_gteq(fr_time_add(last_hup, fr_time_delta_from_sec(2)), when)) {
                INFO("HUP - Last HUP was too recent.  Ignoring");
                return;
        }
        last_hup = when;
 
        INFO("HUP - NYI in version 4"); /* Not yet implemented in v4 */
}
 
static fr_table_num_ordered_t config_arg_table[] = {
        { L("rewrite_update"),           offsetof(main_config_t, rewrite_update) },
        { L("forbid_update"),            offsetof(main_config_t, forbid_update) },
        { L("require_enum_prefix"),      offsetof(main_config_t, require_enum_prefix) },
        { L("v3_enum_names"),            offsetof(main_config_t, require_enum_prefix) },
};
static size_t config_arg_table_len = NUM_ELEMENTS(config_arg_table);
 
/*
 *      Migration function that allows for command-line over-ride of
 *      data structures which need to be initialized before the
 *      configuration files are loaded.
 *
 *      This should really only be temporary, until we get rid of flat vs nested.
 */
int main_config_parse_option(char const *value)
{
        fr_value_box_t box;
        size_t offset;
        char const *p;
        bool *out;
 
        p = strchr(value, '=');
        if (!p) return -1;
 
        offset = fr_table_value_by_substr(config_arg_table, value, p - value, 0);
        if (offset) {
                out = (bool *) (((uintptr_t) main_config) + offset);
 
        } else {
                return -1;
        }
 
        p += 1;
 
        fr_value_box_init(&box, FR_TYPE_BOOL, NULL, false);
        if (fr_value_box_from_str(NULL, &box, FR_TYPE_BOOL, NULL,
                                  p, strlen(p), NULL, false) < 0) {
                fr_perror("Invalid boolean \"%s\"", p);
                fr_exit(1);
        }
 
        if (out == &main_config->require_enum_prefix) tmpl_require_enum_prefix = box.vb_bool;
 
        *out = box.vb_bool;
 
        return 0;
}
 
/*
 *      Allow other pieces of the code to examine the migration options.
 */
bool main_config_migrate_option_get(char const *name)
{
        size_t offset;
 
        if (!main_config) return false;
 
        if (strcmp(name, "use_new_conditions") == 0) return true; /* ignore this for migration */
 
        offset = fr_table_value_by_substr(config_arg_table, name, strlen(name), 0);
        if (!offset) return false;
 
        return *(bool *) (((uintptr_t) main_config) + offset);
}