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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* 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:
*
* Copyright (C) 2021 Aleksander Morgado <aleksander@aleksander.es>
*/
#include <stdlib.h>
#include <glib.h>
#include <glib-object.h>
#include <gio/gio.h>
#include "mm-log-object.h"
#include "mm-kernel-device-helpers.h"
/******************************************************************************/
gchar *
mm_kernel_device_get_lower_device_name (const gchar *sysfs_path)
{
g_autoptr(GFile) dirfile = NULL;
g_autoptr(GFileEnumerator) direnum = NULL;
dirfile = g_file_new_for_path (sysfs_path);
direnum = g_file_enumerate_children (dirfile,
G_FILE_ATTRIBUTE_STANDARD_NAME,
G_FILE_QUERY_INFO_NONE,
NULL,
NULL);
if (!direnum)
return NULL;
while (TRUE) {
GFileInfo *info;
g_autofree gchar *filename = NULL;
g_autofree gchar *link_path = NULL;
g_autofree gchar *real_path = NULL;
if (!g_file_enumerator_iterate (direnum, &info, NULL, NULL, NULL) || !info)
break;
filename = g_file_info_get_attribute_as_string (info, G_FILE_ATTRIBUTE_STANDARD_NAME);
if (!filename || !g_str_has_prefix (filename, "lower_"))
continue;
link_path = g_strdup_printf ("%s/%s", sysfs_path, filename);
real_path = realpath (link_path, NULL);
if (!real_path)
continue;
return g_path_get_basename (real_path);
}
return NULL;
}
/******************************************************************************/
static gchar *
build_string_match_pattern (const gchar *str)
{
GString *regex_pattern;
const gchar *str_start;
gsize len;
g_autofree gchar *aux = NULL;
gboolean prefix_match = FALSE;
gboolean suffix_match = FALSE;
/* We allow prefix and suffix matches given as input, by means of the
* single '*' character given either at the beginning or the end of the
* string. If given in another place, it will assumed to be explicitly
* the '*' character, not a catch-all indication. */
regex_pattern = g_string_new (NULL);
/* suffix match? */
if (str[0] == '*') {
str_start = &str[1];
suffix_match = TRUE;
} else
str_start = str;
/* prefix match? */
len = strlen (str_start);
if (len > 0 && str_start[len - 1] == '*') {
len--;
prefix_match = TRUE;
}
/* match start of string */
g_string_append (regex_pattern, "^");
if (suffix_match)
g_string_append (regex_pattern, ".*");
aux = g_regex_escape_string (str_start, len);
g_string_append (regex_pattern, aux);
if (prefix_match)
g_string_append (regex_pattern, ".*");
/* match end of string */
g_string_append (regex_pattern, "$");
return g_string_free (regex_pattern, FALSE);
}
gboolean
mm_kernel_device_generic_string_match (const gchar *str,
const gchar *pattern,
gpointer log_object)
{
g_autoptr(GError) inner_error = NULL;
g_autoptr(GRegex) regex = NULL;
g_autoptr(GMatchInfo) match_info = NULL;
g_autofree gchar *regex_pattern = NULL;
regex_pattern = build_string_match_pattern (pattern);
regex = g_regex_new (regex_pattern, G_REGEX_UNGREEDY, 0, &inner_error);
if (!regex) {
mm_obj_warn (log_object, "invalid pattern in rule '%s': %s", regex_pattern, inner_error->message);
return FALSE;
}
g_regex_match_full (regex, str, -1, 0, 0, &match_info, &inner_error);
if (inner_error) {
mm_obj_warn (log_object, "couldn't apply pattern match in rule '%s': %s", regex_pattern, inner_error->message);
return FALSE;
}
if (!g_match_info_matches (match_info))
return FALSE;
mm_obj_dbg (log_object, "pattern '%s' matched: '%s'", regex_pattern, str);
return TRUE;
}
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