inet/inet6_scopeid_pton.c

   1 /* Convert an IPv6 scope ID from text to the internal representation.
   2    Copyright (C) 2016-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <net-internal.h>
  20
  21 #include <ctype.h>
  22 #include <errno.h>
  23 #include <locale.h>
  24 #include <net/if.h>
  25 #include <stdbool.h>
  26 #include <stdint.h>
  27 #include <stdlib.h>
  28
  29 /* Parse SOURCE as a scope ID for ADDRESS.  Return 0 on success and -1
  30    on error.  */
  31 int
  32 __inet6_scopeid_pton (const struct in6_addr *address, const char *scope,
  33                       uint32_t *result)
  34 {
  35   if (IN6_IS_ADDR_LINKLOCAL (address)
  36       || IN6_IS_ADDR_MC_NODELOCAL (address)
  37       || IN6_IS_ADDR_MC_LINKLOCAL (address))
  38     {
  39       uint32_t number = __if_nametoindex (scope);
  40       if (number != 0)
  41         {
  42           *result = number;
  43           return 0;
  44         }
  45     }
  46
  47   if (isdigit_l (scope[0], _nl_C_locobj_ptr))
  48     {
  49       char *end;
  50       unsigned long long number
  51         = ____strtoull_l_internal (scope, &end, /*base */ 10, /* group */ 0,
  52                                    /* bin_cst */ false, _nl_C_locobj_ptr);
  53       if (*end == '\0' && number <= UINT32_MAX)
  54         {
  55           *result = number;
  56           return 0;
  57         }
  58     }
  59
  60   __set_errno (EINVAL);
  61   return -1;
  62 }
  63
  64 libc_hidden_def (__inet6_scopeid_pton)