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network-manager-wireguard/shared/nm-utils/nm-shared-utils.c

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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/* NetworkManager -- Network link manager
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA.
*
* (C) Copyright 2016 Red Hat, Inc.
*/
#include "nm-default.h"
#include "nm-shared-utils.h"
#include <errno.h>
#include <arpa/inet.h>
/*****************************************************************************/
const void *const _NM_PTRARRAY_EMPTY[1] = { NULL };
/*****************************************************************************/
const NMIPAddr nm_ip_addr_zero = { 0 };
/*****************************************************************************/
void
nm_utils_strbuf_append_c (char **buf, gsize *len, char c)
{
switch (*len) {
case 0:
return;
case 1:
(*buf)[0] = '\0';
*len = 0;
(*buf)++;
return;
default:
(*buf)[0] = c;
(*buf)[1] = '\0';
(*len)--;
(*buf)++;
return;
}
}
void
nm_utils_strbuf_append_str (char **buf, gsize *len, const char *str)
{
gsize src_len;
switch (*len) {
case 0:
return;
case 1:
if (!str || !*str) {
(*buf)[0] = '\0';
return;
}
(*buf)[0] = '\0';
*len = 0;
(*buf)++;
return;
default:
if (!str || !*str) {
(*buf)[0] = '\0';
return;
}
src_len = g_strlcpy (*buf, str, *len);
if (src_len >= *len) {
*buf = &(*buf)[*len];
*len = 0;
} else {
*buf = &(*buf)[src_len];
*len -= src_len;
}
return;
}
}
void
nm_utils_strbuf_append (char **buf, gsize *len, const char *format, ...)
{
char *p = *buf;
va_list args;
gint retval;
if (*len == 0)
return;
va_start (args, format);
retval = g_vsnprintf (p, *len, format, args);
va_end (args);
if (retval >= *len) {
*buf = &p[*len];
*len = 0;
} else {
*buf = &p[retval];
*len -= retval;
}
}
/*****************************************************************************/
/**
* _nm_utils_ip4_prefix_to_netmask:
* @prefix: a CIDR prefix
*
* Returns: the netmask represented by the prefix, in network byte order
**/
guint32
_nm_utils_ip4_prefix_to_netmask (guint32 prefix)
{
return prefix < 32 ? ~htonl(0xFFFFFFFF >> prefix) : 0xFFFFFFFF;
}
/**
* _nm_utils_ip4_get_default_prefix:
* @ip: an IPv4 address (in network byte order)
*
* When the Internet was originally set up, various ranges of IP addresses were
* segmented into three network classes: A, B, and C. This function will return
* a prefix that is associated with the IP address specified defining where it
* falls in the predefined classes.
*
* Returns: the default class prefix for the given IP
**/
/* The function is originally from ipcalc.c of Red Hat's initscripts. */
guint32
_nm_utils_ip4_get_default_prefix (guint32 ip)
{
if (((ntohl (ip) & 0xFF000000) >> 24) <= 127)
return 8; /* Class A - 255.0.0.0 */
else if (((ntohl (ip) & 0xFF000000) >> 24) <= 191)
return 16; /* Class B - 255.255.0.0 */
return 24; /* Class C - 255.255.255.0 */
}
gboolean
nm_utils_ip_is_site_local (int addr_family,
const void *address)
{
in_addr_t addr4;
switch (addr_family) {
case AF_INET:
/* RFC1918 private addresses
* 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16 */
addr4 = ntohl (*((const in_addr_t *) address));
return (addr4 & 0xff000000) == 0x0a000000
|| (addr4 & 0xfff00000) == 0xac100000
|| (addr4 & 0xffff0000) == 0xc0a80000;
case AF_INET6:
return IN6_IS_ADDR_SITELOCAL (address);
default:
g_return_val_if_reached (FALSE);
}
}
/*****************************************************************************/
gboolean
nm_utils_parse_inaddr_bin (const char *text,
int family,
gpointer out_addr)
{
NMIPAddr addrbin;
g_return_val_if_fail (text, FALSE);
if (family == AF_UNSPEC)
family = strchr (text, ':') ? AF_INET6 : AF_INET;
else
g_return_val_if_fail (NM_IN_SET (family, AF_INET, AF_INET6), FALSE);
if (inet_pton (family, text, out_addr ?: &addrbin) != 1)
return FALSE;
return TRUE;
}
gboolean
nm_utils_parse_inaddr (const char *text,
int family,
char **out_addr)
{
NMIPAddr addrbin;
char addrstr_buf[MAX (INET_ADDRSTRLEN, INET6_ADDRSTRLEN)];
if (!nm_utils_parse_inaddr_bin (text, family, &addrbin))
return FALSE;
NM_SET_OUT (out_addr, g_strdup (inet_ntop (family, &addrbin, addrstr_buf, sizeof (addrstr_buf))));
return TRUE;
}
gboolean
nm_utils_parse_inaddr_prefix_bin (const char *text,
int family,
gpointer out_addr,
int *out_prefix)
{
gs_free char *addrstr_free = NULL;
int prefix = -1;
const char *slash;
const char *addrstr;
NMIPAddr addrbin;
int addr_len;
g_return_val_if_fail (text, FALSE);
if (family == AF_UNSPEC)
family = strchr (text, ':') ? AF_INET6 : AF_INET;
if (family == AF_INET)
addr_len = sizeof (in_addr_t);
else if (family == AF_INET6)
addr_len = sizeof (struct in6_addr);
else
g_return_val_if_reached (FALSE);
slash = strchr (text, '/');
if (slash)
addrstr = addrstr_free = g_strndup (text, slash - text);
else
addrstr = text;
if (inet_pton (family, addrstr, &addrbin) != 1)
return FALSE;
if (slash) {
prefix = _nm_utils_ascii_str_to_int64 (slash + 1, 10,
0,
family == AF_INET ? 32 : 128,
-1);
if (prefix == -1)
return FALSE;
}
if (out_addr)
memcpy (out_addr, &addrbin, addr_len);
NM_SET_OUT (out_prefix, prefix);
return TRUE;
}
gboolean
nm_utils_parse_inaddr_prefix (const char *text,
int family,
char **out_addr,
int *out_prefix)
{
NMIPAddr addrbin;
char addrstr_buf[MAX (INET_ADDRSTRLEN, INET6_ADDRSTRLEN)];
if (!nm_utils_parse_inaddr_prefix_bin (text, family, &addrbin, out_prefix))
return FALSE;
NM_SET_OUT (out_addr, g_strdup (inet_ntop (family, &addrbin, addrstr_buf, sizeof (addrstr_buf))));
return TRUE;
}
/*****************************************************************************/
/* _nm_utils_ascii_str_to_int64:
*
* A wrapper for g_ascii_strtoll, that checks whether the whole string
* can be successfully converted to a number and is within a given
* range. On any error, @fallback will be returned and %errno will be set
* to a non-zero value. On success, %errno will be set to zero, check %errno
* for errors. Any trailing or leading (ascii) white space is ignored and the
* functions is locale independent.
*
* The function is guaranteed to return a value between @min and @max
* (inclusive) or @fallback. Also, the parsing is rather strict, it does
* not allow for any unrecognized characters, except leading and trailing
* white space.
**/
gint64
_nm_utils_ascii_str_to_int64 (const char *str, guint base, gint64 min, gint64 max, gint64 fallback)
{
gint64 v;
const char *s = NULL;
if (str) {
while (g_ascii_isspace (str[0]))
str++;
}
if (!str || !str[0]) {
errno = EINVAL;
return fallback;
}
errno = 0;
v = g_ascii_strtoll (str, (char **) &s, base);
if (errno != 0)
return fallback;
if (s[0] != '\0') {
while (g_ascii_isspace (s[0]))
s++;
if (s[0] != '\0') {
errno = EINVAL;
return fallback;
}
}
if (v > max || v < min) {
errno = ERANGE;
return fallback;
}
return v;
}
/*****************************************************************************/
/**
* nm_utils_strsplit_set:
* @str: the string to split.
* @delimiters: the set of delimiters. If %NULL, defaults to " \t\n",
* like bash's $IFS.
*
* This is a replacement for g_strsplit_set() which avoids copying
* each word once (the entire strv array), but instead copies it once
* and all words point into that internal copy.
*
* Another difference from g_strsplit_set() is that this never returns
* empty words. Multiple delimiters are combined and treated as one.
*
* Returns: %NULL if @str is %NULL or contains only delimiters.
* Otherwise, a %NULL terminated strv array containing non-empty
* words, split at the delimiter characters (delimiter characters
* are removed).
* The strings to which the result strv array points to are allocated
* after the returned result itself. Don't free the strings themself,
* but free everything with g_free().
*/
const char **
nm_utils_strsplit_set (const char *str, const char *delimiters)
{
const char **ptr, **ptr0;
gsize alloc_size, plen, i;
gsize str_len;
char *s0;
char *s;
guint8 delimiters_table[256];
if (!str)
return NULL;
/* initialize lookup table for delimiter */
if (!delimiters)
delimiters = " \t\n";
memset (delimiters_table, 0, sizeof (delimiters_table));
for (i = 0; delimiters[i]; i++)
delimiters_table[(guint8) delimiters[i]] = 1;
#define _is_delimiter(ch, delimiters_table) \
((delimiters_table)[(guint8) (ch)] != 0)
/* skip initial delimiters, and return of the remaining string is
* empty. */
while (_is_delimiter (str[0], delimiters_table))
str++;
if (!str[0])
return NULL;
str_len = strlen (str) + 1;
alloc_size = 8;
/* we allocate the buffer larger, so to copy @str at the
* end of it as @s0. */
ptr0 = g_malloc ((sizeof (const char *) * (alloc_size + 1)) + str_len);
s0 = (char *) &ptr0[alloc_size + 1];
memcpy (s0, str, str_len);
plen = 0;
s = s0;
ptr = ptr0;
while (TRUE) {
if (plen >= alloc_size) {
const char **ptr_old = ptr;
/* reallocate the buffer. Note that for now the string
* continues to be in ptr0/s0. We fix that at the end. */
alloc_size += 2;
ptr = g_malloc ((sizeof (const char *) * (alloc_size + 1)) + str_len);
memcpy (ptr, ptr_old, sizeof (const char *) * plen);
if (ptr_old != ptr0)
g_free (ptr_old);
}
ptr[plen++] = s;
nm_assert (s[0] && !_is_delimiter (s[0], delimiters_table));
while (TRUE) {
s++;
if (_is_delimiter (s[0], delimiters_table))
break;
if (s[0] == '\0')
goto done;
}
s[0] = '\0';
s++;
while (_is_delimiter (s[0], delimiters_table))
s++;
if (s[0] == '\0')
break;
}
done:
ptr[plen] = NULL;
if (ptr != ptr0) {
/* we reallocated the buffer. We must copy over the
* string @s0 and adjust the pointers. */
s = (char *) &ptr[alloc_size + 1];
memcpy (s, s0, str_len);
for (i = 0; i < plen; i++)
ptr[i] = &s[ptr[i] - s0];
g_free (ptr0);
}
return ptr;
}
/**
* nm_utils_strv_find_first:
* @list: the strv list to search
* @len: the length of the list, or a negative value if @list is %NULL terminated.
* @needle: the value to search for. The search is done using strcmp().
*
* Searches @list for @needle and returns the index of the first match (based
* on strcmp()).
*
* For convenience, @list has type 'char**' instead of 'const char **'.
*
* Returns: index of first occurrence or -1 if @needle is not found in @list.
*/
gssize
nm_utils_strv_find_first (char **list, gssize len, const char *needle)
{
gssize i;
if (len > 0) {
g_return_val_if_fail (list, -1);
if (!needle) {
/* if we search a list with known length, %NULL is a valid @needle. */
for (i = 0; i < len; i++) {
if (!list[i])
return i;
}
} else {
for (i = 0; i < len; i++) {
if (list[i] && !strcmp (needle, list[i]))
return i;
}
}
} else if (len < 0) {
g_return_val_if_fail (needle, -1);
if (list) {
for (i = 0; list[i]; i++) {
if (strcmp (needle, list[i]) == 0)
return i;
}
}
}
return -1;
}
char **
_nm_utils_strv_cleanup (char **strv,
gboolean strip_whitespace,
gboolean skip_empty,
gboolean skip_repeated)
{
guint i, j;
if (!strv || !*strv)
return strv;
if (strip_whitespace) {
for (i = 0; strv[i]; i++)
g_strstrip (strv[i]);
}
if (!skip_empty && !skip_repeated)
return strv;
j = 0;
for (i = 0; strv[i]; i++) {
if ( (skip_empty && !*strv[i])
|| (skip_repeated && nm_utils_strv_find_first (strv, j, strv[i]) >= 0))
g_free (strv[i]);
else
strv[j++] = strv[i];
}
strv[j] = NULL;
return strv;
}
/*****************************************************************************/
gint
_nm_utils_ascii_str_to_bool (const char *str,
gint default_value)
{
gsize len;
char *s = NULL;
if (!str)
return default_value;
while (str[0] && g_ascii_isspace (str[0]))
str++;
if (!str[0])
return default_value;
len = strlen (str);
if (g_ascii_isspace (str[len - 1])) {
s = g_strdup (str);
g_strchomp (s);
str = s;
}
if (!g_ascii_strcasecmp (str, "true") || !g_ascii_strcasecmp (str, "yes") || !g_ascii_strcasecmp (str, "on") || !g_ascii_strcasecmp (str, "1"))
default_value = TRUE;
else if (!g_ascii_strcasecmp (str, "false") || !g_ascii_strcasecmp (str, "no") || !g_ascii_strcasecmp (str, "off") || !g_ascii_strcasecmp (str, "0"))
default_value = FALSE;
if (s)
g_free (s);
return default_value;
}
/*****************************************************************************/
NM_CACHED_QUARK_FCN ("nm-utils-error-quark", nm_utils_error_quark)
void
nm_utils_error_set_cancelled (GError **error,
gboolean is_disposing,
const char *instance_name)
{
if (is_disposing) {
g_set_error (error, NM_UTILS_ERROR, NM_UTILS_ERROR_CANCELLED_DISPOSING,
"Disposing %s instance",
instance_name && *instance_name ? instance_name : "source");
} else {
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_CANCELLED,
"Request cancelled");
}
}
gboolean
nm_utils_error_is_cancelled (GError *error,
gboolean consider_is_disposing)
{
if (error) {
if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
return TRUE;
if ( consider_is_disposing
&& g_error_matches (error, NM_UTILS_ERROR, NM_UTILS_ERROR_CANCELLED_DISPOSING))
return TRUE;
}
return FALSE;
}
/*****************************************************************************/
/**
* nm_g_object_set_property:
* @object: the target object
* @property_name: the property name
* @value: the #GValue to set
* @error: (allow-none): optional error argument
*
* A reimplementation of g_object_set_property(), but instead
* returning an error instead of logging a warning. All g_object_set*()
* versions in glib require you to not pass invalid types or they will
* log a g_warning() -- without reporting an error. We don't want that,
* so we need to hack error checking around it.
*
* Returns: whether the value was successfully set.
*/
gboolean
nm_g_object_set_property (GObject *object,
const gchar *property_name,
const GValue *value,
GError **error)
{
GParamSpec *pspec;
nm_auto_unset_gvalue GValue tmp_value = G_VALUE_INIT;
GObjectClass *klass;
g_return_val_if_fail (G_IS_OBJECT (object), FALSE);
g_return_val_if_fail (property_name != NULL, FALSE);
g_return_val_if_fail (G_IS_VALUE (value), FALSE);
g_return_val_if_fail (!error || !*error, FALSE);
/* g_object_class_find_property() does g_param_spec_get_redirect_target(),
* where we differ from a plain g_object_set_property(). */
pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (object), property_name);
if (!pspec) {
g_set_error (error, NM_UTILS_ERROR, NM_UTILS_ERROR_UNKNOWN,
_("object class '%s' has no property named '%s'"),
G_OBJECT_TYPE_NAME (object),
property_name);
return FALSE;
}
if (!(pspec->flags & G_PARAM_WRITABLE)) {
g_set_error (error, NM_UTILS_ERROR, NM_UTILS_ERROR_UNKNOWN,
_("property '%s' of object class '%s' is not writable"),
pspec->name,
G_OBJECT_TYPE_NAME (object));
return FALSE;
}
if ((pspec->flags & G_PARAM_CONSTRUCT_ONLY)) {
g_set_error (error, NM_UTILS_ERROR, NM_UTILS_ERROR_UNKNOWN,
_("construct property \"%s\" for object '%s' can't be set after construction"),
pspec->name, G_OBJECT_TYPE_NAME (object));
return FALSE;
}
klass = g_type_class_peek (pspec->owner_type);
if (klass == NULL) {
g_set_error (error, NM_UTILS_ERROR, NM_UTILS_ERROR_UNKNOWN,
_("'%s::%s' is not a valid property name; '%s' is not a GObject subtype"),
g_type_name (pspec->owner_type), pspec->name, g_type_name (pspec->owner_type));
return FALSE;
}
/* provide a copy to work from, convert (if necessary) and validate */
g_value_init (&tmp_value, pspec->value_type);
if (!g_value_transform (value, &tmp_value)) {
g_set_error (error, NM_UTILS_ERROR, NM_UTILS_ERROR_UNKNOWN,
_("unable to set property '%s' of type '%s' from value of type '%s'"),
pspec->name,
g_type_name (pspec->value_type),
G_VALUE_TYPE_NAME (value));
return FALSE;
}
if ( g_param_value_validate (pspec, &tmp_value)
&& !(pspec->flags & G_PARAM_LAX_VALIDATION)) {
gs_free char *contents = g_strdup_value_contents (value);
g_set_error (error, NM_UTILS_ERROR, NM_UTILS_ERROR_UNKNOWN,
_("value \"%s\" of type '%s' is invalid or out of range for property '%s' of type '%s'"),
contents,
G_VALUE_TYPE_NAME (value),
pspec->name,
g_type_name (pspec->value_type));
return FALSE;
}
g_object_set_property (object, property_name, &tmp_value);
return TRUE;
}
GParamSpec *
nm_g_object_class_find_property_from_gtype (GType gtype,
const char *property_name)
{
nm_auto_unref_gtypeclass GObjectClass *gclass = NULL;
gclass = g_type_class_ref (gtype);
return g_object_class_find_property (gclass, property_name);
}
/*****************************************************************************/
static void
_str_append_escape (GString *s, char ch)
{
g_string_append_c (s, '\\');
g_string_append_c (s, '0' + ((((guchar) ch) >> 6) & 07));
g_string_append_c (s, '0' + ((((guchar) ch) >> 3) & 07));
g_string_append_c (s, '0' + ( ((guchar) ch) & 07));
}
/**
* nm_utils_str_utf8safe_escape:
* @str: NUL terminated input string, possibly in utf-8 encoding
* @flags: #NMUtilsStrUtf8SafeFlags flags
* @to_free: (out): return the pointer location of the string
* if a copying was necessary.
*
* Returns the possible non-UTF-8 NUL terminated string @str
* and uses backslash escaping (C escaping, like g_strescape())
* to sanitize non UTF-8 characters. The result is valid
* UTF-8.
*
* The operation can be reverted with g_strcompress() or
* nm_utils_str_utf8safe_unescape().
*
* Depending on @flags, valid UTF-8 characters are not escaped at all
* (except the escape character '\\'). This is the difference to g_strescape(),
* which escapes all non-ASCII characters. This allows to pass on
* valid UTF-8 characters as-is and can be directly shown to the user
* as UTF-8 -- with exception of the backslash escape character,
* invalid UTF-8 sequences, and other (depending on @flags).
*
* Returns: the escaped input string, as valid UTF-8. If no escaping
* is necessary, it returns the input @str. Otherwise, an allocated
* string @to_free is returned which must be freed by the caller
* with g_free. The escaping can be reverted by g_strcompress().
**/
const char *
nm_utils_str_utf8safe_escape (const char *str, NMUtilsStrUtf8SafeFlags flags, char **to_free)
{
const char *p = NULL;
GString *s;
g_return_val_if_fail (to_free, NULL);
*to_free = NULL;
if (!str || !str[0])
return str;
if ( g_utf8_validate (str, -1, &p)
&& !NM_STRCHAR_ANY (str, ch,
( ch == '\\' \
|| ( NM_FLAGS_HAS (flags, NM_UTILS_STR_UTF8_SAFE_FLAG_ESCAPE_CTRL) \
&& ch < ' ') \
|| ( NM_FLAGS_HAS (flags, NM_UTILS_STR_UTF8_SAFE_FLAG_ESCAPE_NON_ASCII) \
&& ((guchar) ch) >= 127))))
return str;
s = g_string_sized_new ((p - str) + strlen (p) + 5);
do {
for (; str < p; str++) {
char ch = str[0];
if (ch == '\\')
g_string_append (s, "\\\\");
else if ( ( NM_FLAGS_HAS (flags, NM_UTILS_STR_UTF8_SAFE_FLAG_ESCAPE_CTRL) \
&& ch < ' ') \
|| ( NM_FLAGS_HAS (flags, NM_UTILS_STR_UTF8_SAFE_FLAG_ESCAPE_NON_ASCII) \
&& ((guchar) ch) >= 127))
_str_append_escape (s, ch);
else
g_string_append_c (s, ch);
}
if (p[0] == '\0')
break;
_str_append_escape (s, p[0]);
str = &p[1];
g_utf8_validate (str, -1, &p);
} while (TRUE);
*to_free = g_string_free (s, FALSE);
return *to_free;
}
const char *
nm_utils_str_utf8safe_unescape (const char *str, char **to_free)
{
g_return_val_if_fail (to_free, NULL);
if (!str || !strchr (str, '\\')) {
*to_free = NULL;
return str;
}
return (*to_free = g_strcompress (str));
}
/**
* nm_utils_str_utf8safe_escape_cp:
* @str: NUL terminated input string, possibly in utf-8 encoding
* @flags: #NMUtilsStrUtf8SafeFlags flags
*
* Like nm_utils_str_utf8safe_escape(), except the returned value
* is always a copy of the input and must be freed by the caller.
*
* Returns: the escaped input string in UTF-8 encoding. The returned
* value should be freed with g_free().
* The escaping can be reverted by g_strcompress().
**/
char *
nm_utils_str_utf8safe_escape_cp (const char *str, NMUtilsStrUtf8SafeFlags flags)
{
char *s;
nm_utils_str_utf8safe_escape (str, flags, &s);
return s ?: g_strdup (str);
}
char *
nm_utils_str_utf8safe_unescape_cp (const char *str)
{
return str ? g_strcompress (str) : NULL;
}
char *
nm_utils_str_utf8safe_escape_take (char *str, NMUtilsStrUtf8SafeFlags flags)
{
char *str_to_free;
nm_utils_str_utf8safe_escape (str, flags, &str_to_free);
if (str_to_free) {
g_free (str);
return str_to_free;
}
return str;
}
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