/*
 * Copyright (c) 2022 Daniel Kroczynski <d@kroczynski.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/stat.h>

#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "blind.h"
#include "log.h"

struct blind *	config_init(void);
int		config_perm(int, const char *);

struct blind *
config_init(void)
{
	struct blind *cfg;

	if ((cfg = calloc(1, sizeof(*cfg))) == NULL)
		return cfg;

	if (strlcpy(cfg->bl_sock, BL_SOCK, PATH_MAX) >= PATH_MAX)
		log_fatal("socket file name exceeds PATH_MAX");

	cfg->bl_ttl = BL_TTL;
	cfg->bl_opt = BL_OPT_DEFAULT;

	return cfg;
}

int
config_perm(int fd, const char *name)
{
	struct stat st;

	if (fstat(fd, &st)) {
		log_debug("cannot stat config file");
		return (-1);
	}
	if (st.st_uid != 0 && st.st_uid != getuid()) {
		log_debug("not root or current user owned");
		return (-1);
	}
	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
		log_debug("insecure config file");
		return (-1);
	}
	return (0);
}