cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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osunixdir.c (4499B)

      1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
      2/******************************************************************************
      3 *
      4 * Module Name: osunixdir - Unix directory access interfaces
      5 *
      6 * Copyright (C) 2000 - 2022, Intel Corp.
      7 *
      8 *****************************************************************************/
      9
     10#include <acpi/acpi.h>
     11
     12#include <stdio.h>
     13#include <stdlib.h>
     14#include <string.h>
     15#include <dirent.h>
     16#include <fnmatch.h>
     17#include <ctype.h>
     18#include <sys/stat.h>
     19
     20/*
     21 * Allocated structure returned from os_open_directory
     22 */
     23typedef struct external_find_info {
     24	char *dir_pathname;
     25	DIR *dir_ptr;
     26	char temp_buffer[256];
     27	char *wildcard_spec;
     28	char requested_file_type;
     29
     30} external_find_info;
     31
     32/*******************************************************************************
     33 *
     34 * FUNCTION:    acpi_os_open_directory
     35 *
     36 * PARAMETERS:  dir_pathname        - Full pathname to the directory
     37 *              wildcard_spec       - string of the form "*.c", etc.
     38 *
     39 * RETURN:      A directory "handle" to be used in subsequent search operations.
     40 *              NULL returned on failure.
     41 *
     42 * DESCRIPTION: Open a directory in preparation for a wildcard search
     43 *
     44 ******************************************************************************/
     45
     46void *acpi_os_open_directory(char *dir_pathname,
     47			     char *wildcard_spec, char requested_file_type)
     48{
     49	struct external_find_info *external_info;
     50	DIR *dir;
     51
     52	/* Allocate the info struct that will be returned to the caller */
     53
     54	external_info = calloc(1, sizeof(struct external_find_info));
     55	if (!external_info) {
     56		return (NULL);
     57	}
     58
     59	/* Get the directory stream */
     60
     61	dir = opendir(dir_pathname);
     62	if (!dir) {
     63		fprintf(stderr, "Cannot open directory - %s\n", dir_pathname);
     64		free(external_info);
     65		return (NULL);
     66	}
     67
     68	/* Save the info in the return structure */
     69
     70	external_info->wildcard_spec = wildcard_spec;
     71	external_info->requested_file_type = requested_file_type;
     72	external_info->dir_pathname = dir_pathname;
     73	external_info->dir_ptr = dir;
     74	return (external_info);
     75}
     76
     77/*******************************************************************************
     78 *
     79 * FUNCTION:    acpi_os_get_next_filename
     80 *
     81 * PARAMETERS:  dir_handle          - Created via acpi_os_open_directory
     82 *
     83 * RETURN:      Next filename matched. NULL if no more matches.
     84 *
     85 * DESCRIPTION: Get the next file in the directory that matches the wildcard
     86 *              specification.
     87 *
     88 ******************************************************************************/
     89
     90char *acpi_os_get_next_filename(void *dir_handle)
     91{
     92	struct external_find_info *external_info = dir_handle;
     93	struct dirent *dir_entry;
     94	char *temp_str;
     95	int str_len;
     96	struct stat temp_stat;
     97	int err;
     98
     99	while ((dir_entry = readdir(external_info->dir_ptr))) {
    100		if (!fnmatch
    101		    (external_info->wildcard_spec, dir_entry->d_name, 0)) {
    102			if (dir_entry->d_name[0] == '.') {
    103				continue;
    104			}
    105
    106			str_len = strlen(dir_entry->d_name) +
    107			    strlen(external_info->dir_pathname) + 2;
    108
    109			temp_str = calloc(str_len, 1);
    110			if (!temp_str) {
    111				fprintf(stderr,
    112					"Could not allocate buffer for temporary string\n");
    113				return (NULL);
    114			}
    115
    116			strcpy(temp_str, external_info->dir_pathname);
    117			strcat(temp_str, "/");
    118			strcat(temp_str, dir_entry->d_name);
    119
    120			err = stat(temp_str, &temp_stat);
    121			if (err == -1) {
    122				fprintf(stderr,
    123					"Cannot stat file (should not happen) - %s\n",
    124					temp_str);
    125				free(temp_str);
    126				return (NULL);
    127			}
    128
    129			free(temp_str);
    130
    131			if ((S_ISDIR(temp_stat.st_mode)
    132			     && (external_info->requested_file_type ==
    133				 REQUEST_DIR_ONLY))
    134			    || ((!S_ISDIR(temp_stat.st_mode)
    135				 && external_info->requested_file_type ==
    136				 REQUEST_FILE_ONLY))) {
    137
    138				/* copy to a temp buffer because dir_entry struct is on the stack */
    139
    140				strcpy(external_info->temp_buffer,
    141				       dir_entry->d_name);
    142				return (external_info->temp_buffer);
    143			}
    144		}
    145	}
    146
    147	return (NULL);
    148}
    149
    150/*******************************************************************************
    151 *
    152 * FUNCTION:    acpi_os_close_directory
    153 *
    154 * PARAMETERS:  dir_handle          - Created via acpi_os_open_directory
    155 *
    156 * RETURN:      None.
    157 *
    158 * DESCRIPTION: Close the open directory and cleanup.
    159 *
    160 ******************************************************************************/
    161
    162void acpi_os_close_directory(void *dir_handle)
    163{
    164	struct external_find_info *external_info = dir_handle;
    165
    166	/* Close the directory and free allocations */
    167
    168	closedir(external_info->dir_ptr);
    169	free(dir_handle);
    170}