global.c

/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2021 Yuichiro Naito
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
#include <stdlib.h>
#include <string.h>

#include "bmd.h"
#include "bmd_plugin.h"
#include "conf.h"
#include "server.h"

/*
  Default global configuration.
 */
static char gl0_config_file[] = LOCALBASE "/etc/bmd.conf";
static char gl0_plugin_dir[] = LOCALBASE "/libexec/bmd";
static char gl0_vars_dir[] = LOCALBASE "/var/cache/bmd";
static char gl0_pid_path[] = "/var/run/bmd.pid";
static char gl0_cmd_socket_path[] = "/var/run/bmd.sock";
static char gl0_cmd_socket_mode[] = "0600";
static struct global_conf gl_conf0 = { .config_file = gl0_config_file,
	.plugin_dir = gl0_plugin_dir,
	.vars_dir = gl0_vars_dir,
	.pid_path = gl0_pid_path,
	.cmd_socket_path = gl0_cmd_socket_path,
	.unix_domain_socket_mode = gl0_cmd_socket_mode,
	.nmdm_offset = DEFAULT_NMDM_OFFSET,
	.foreground = 0 };

struct global_conf *gl_conf = &gl_conf0;

void
free_global_conf(struct global_conf *gc)
{
	free(gc->config_file);
	free(gc->pid_path);
	free(gc->plugin_dir);
	free(gc->vars_dir);
	free(gc->cmd_socket_path);
	free(gc->unix_domain_socket_mode);
	free(gc);
}

void
free_gl_conf(void)
{
	if (gl_conf != &gl_conf0)
		free_global_conf(gl_conf);
	gl_conf = &gl_conf0;
}

int
init_gl_conf(void)
{
	struct global_conf *t;
	if ((t = calloc(1, sizeof(*t))) == NULL)
		return -1;
#define COPY_ATTR_STRING(attr)                         \
	if (gl_conf0.attr != NULL &&                   \
	    (t->attr = strdup(gl_conf0.attr)) == NULL) \
		goto err;
#define COPY_ATTR_INT(attr) t->attr = gl_conf0.attr

	COPY_ATTR_STRING(config_file);
	COPY_ATTR_STRING(pid_path);
	COPY_ATTR_STRING(plugin_dir);
	COPY_ATTR_STRING(vars_dir);
	COPY_ATTR_STRING(cmd_socket_path);
	COPY_ATTR_STRING(unix_domain_socket_mode);
	COPY_ATTR_INT(nmdm_offset);
	COPY_ATTR_INT(foreground);
#undef COPY_ATTR_STRING
#undef COPY_ATTR_INT

	gl_conf = t;
	return 0;

err:
	free_global_conf(t);
	return -1;
}

int
merge_global_conf(struct global_conf *gc)
{
#define REPLACE_STR(attr)                    \
	if (gc->attr) {                      \
		if (gl_conf->attr)           \
			free(gl_conf->attr); \
		gl_conf->attr = gc->attr;    \
		gc->attr = NULL;             \
	}
#define REPLACE_INT(attr)  \
	if (gc->attr != 0) \
		gl_conf->attr = gc->attr;

	REPLACE_STR(config_file);
	REPLACE_STR(pid_path);
	REPLACE_STR(plugin_dir);
	REPLACE_STR(vars_dir);
	REPLACE_STR(cmd_socket_path);
	REPLACE_STR(unix_domain_socket_mode);
	REPLACE_INT(nmdm_offset);
#undef REPLACE_INT
#undef REPLACE_STR

	free(gc);
	return 0;
}