NetworkManager/shared/systemd/nm-sd-utils-shared.c

// SPDX-License-Identifier: LGPL-2.1+
/*
 * Copyright (C) 2018 Red Hat, Inc.
 */

#include "nm-default.h"

#include "nm-sd-utils-shared.h"

#include "nm-sd-adapt-shared.h"

#include "dns-domain.h"
#include "hexdecoct.h"
#include "hostname-util.h"
#include "path-util.h"
#include "web-util.h"

/*****************************************************************************/

const bool mempool_use_allowed = true;

/*****************************************************************************/

gboolean
nm_sd_utils_path_equal (const char *a, const char *b)
{
	return path_equal (a, b);
}

char *
nm_sd_utils_path_simplify (char *path, gboolean kill_dots)
{
	return path_simplify (path, kill_dots);
}

const char *
nm_sd_utils_path_startswith (const char *path, const char *prefix)
{
	return path_startswith (path, prefix);
}

/*****************************************************************************/

int
nm_sd_utils_unbase64char (char ch, gboolean accept_padding_equal)
{
	if (   ch == '='
	    && accept_padding_equal)
		return G_MAXINT;
	return unbase64char (ch);
}

/**
 * nm_sd_utils_unbase64mem:
 * @p: a valid base64 string. Whitespace is ignored, but invalid encodings
 *   will cause the function to fail.
 * @l: the length of @p. @p is not treated as NUL terminated string but
 *   merely as a buffer of ascii characters.
 * @secure: whether the temporary memory will be cleared to avoid leaving
 *   secrets in memory (see also nm_explict_bzero()).
 * @mem: (transfer full): the decoded buffer on success.
 * @len: the length of @mem on success.
 *
 * glib provides g_base64_decode(), but that does not report any errors
 * from invalid encodings. Expose systemd's implementation which does
 * reject invalid inputs.
 *
 * Returns: a non-negative code on success. Invalid encoding let the
 *   function fail.
 */
int
nm_sd_utils_unbase64mem (const char *p,
                         size_t l,
                         gboolean secure,
                         guint8 **mem,
                         size_t *len)
{
	return unbase64mem_full (p, l, secure, (void **) mem, len);
}

int nm_sd_dns_name_to_wire_format (const char *domain,
                                   guint8 *buffer,
                                   size_t len,
                                   gboolean canonical)
{
	return dns_name_to_wire_format (domain, buffer, len, canonical);
}

int nm_sd_dns_name_is_valid (const char *s)
{
	return dns_name_is_valid (s);
}

gboolean nm_sd_hostname_is_valid (const char *s, bool allow_trailing_dot)
{
	return hostname_is_valid (s, allow_trailing_dot);
}

/*****************************************************************************/

static gboolean
_http_url_is_valid (const char *url, gboolean only_https)
{
	if (   !url
	    || !url[0])
		return FALSE;

	if (   !only_https
	    && NM_STR_HAS_PREFIX (url, "http://"))
		url += NM_STRLEN ("http://");
	else if (NM_STR_HAS_PREFIX (url, "https://"))
		url += NM_STRLEN ("https://");
	else
		return FALSE;

	if (!url[0])
		return FALSE;

	return !NM_STRCHAR_ANY (url, ch, (guchar) ch >= 128u);
}

gboolean
nm_sd_http_url_is_valid_https (const char *url)
{
	/* We use this function to verify connection:mud-url property, it must thus
	 * not change behavior.
	 *
	 * Note that sd_dhcp_client_set_mud_url() and sd_dhcp6_client_set_request_mud_url()
	 * assert with http_url_is_valid() that the argument is valid. We thus must make
	 * sure to only pass URLs that are valid according to http_url_is_valid().
	 *
	 * This is given, because our nm_sd_http_url_is_valid_https() is more strict
	 * than http_url_is_valid().
	 *
	 * We only must make sure that this is also correct in the future, when we
	 * re-import systemd code. */
	nm_assert (_http_url_is_valid (url, FALSE) == http_url_is_valid (url));
	return _http_url_is_valid (url, TRUE);
}

/*****************************************************************************/

int
nmtst_systemd_extract_first_word_all (const char *str, char ***out_strv)
{
	gs_unref_ptrarray GPtrArray *arr = NULL;

	/* we implement a str split function to parse `/proc/cmdline`. This
	 * code should behave like systemd, which uses extract_first_word()
	 * for that.
	 *
	 * As we want to unit-test our implementation to match systemd,
	 * expose this function for testing. */

	g_assert (out_strv);
	g_assert (!*out_strv);

	if (!str)
		return 0;

	arr = g_ptr_array_new_with_free_func (g_free);

	for (;;) {
		gs_free char *word = NULL;
		int r;

		r = extract_first_word (&str, &word, NULL, EXTRACT_UNQUOTE | EXTRACT_RELAX);
		if (r < 0)
			return r;
		if (r == 0)
			break;
		g_ptr_array_add (arr, g_steal_pointer (&word));
	}

	g_ptr_array_add (arr, NULL);

	*out_strv = (char **) g_ptr_array_free (g_steal_pointer (&arr), FALSE);
	return 1;
}