/*      
	This software is licensed under GPL-3, as shown in the file LICENSE
	Author: Linux Gruppe IRB
	Copyright: Linux Gruppe IRB, 2024
*/

#include <sys/stat.h>
#include <dirent.h>
#include <limits.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>

#include "authorized_eid.h"

static int auth_dir(struct passwd *passwd, char path[PATH_MAX], const char *mode)
{
	if (!passwd || !passwd->pw_dir)
		return 0;
	snprintf(path, PATH_MAX, "%s/.eid",
		 passwd->pw_dir);

	if (mode[0] != 'r')
	{
		DIR *dir = opendir(path);

		if (dir)
		{
			/* Directory exists. */
			closedir(dir);
		}
		else if (errno == ENOENT)
		{
			if (mkdir(path, 0700) != 0)
			{
				printf("mkdir() failed: %s\n", strerror(errno));
				return 0;
			}
		}
	}

	return 1;
}

static int auth_file(struct passwd *passwd, char path[PATH_MAX], const char *mode)
{
	if (auth_dir(passwd, path, mode) != 1)
		return 0;
	strcat(path, "/authorized_eid");
	return 1;
}

FILE *auth_fopen(struct passwd *passwd, const char *mode)
{
	char path[PATH_MAX];

	if (auth_file(passwd, path, mode) != 1)
		return NULL;
	return fopen(path, mode);
}