socket/bits/socket2.h

   1 /* Checking macros for socket functions.
   2    Copyright (C) 2005-2021 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 #ifndef _SYS_SOCKET_H
  20 # error "Never include <bits/socket2.h> directly; use <sys/socket.h> instead."
  21 #endif
  22
  23 extern ssize_t __recv_chk (int __fd, void *__buf, size_t __n, size_t __buflen,
  24                            int __flags);
  25 extern ssize_t __REDIRECT (__recv_alias, (int __fd, void *__buf, size_t __n,
  26                                           int __flags), recv);
  27 extern ssize_t __REDIRECT (__recv_chk_warn,
  28                            (int __fd, void *__buf, size_t __n, size_t __buflen,
  29                             int __flags), __recv_chk)
  30      __warnattr ("recv called with bigger length than size of destination "
  31                  "buffer");
  32
  33 __fortify_function ssize_t
  34 recv (int __fd, void *__buf, size_t __n, int __flags)
  35 {
  36   if (__glibc_objsize0 (__buf) != (size_t) -1)
  37     {
  38       if (!__builtin_constant_p (__n))
  39         return __recv_chk (__fd, __buf, __n, __glibc_objsize0 (__buf),
  40                            __flags);
  41
  42       if (__n > __glibc_objsize0 (__buf))
  43         return __recv_chk_warn (__fd, __buf, __n, __glibc_objsize0 (__buf),
  44                                 __flags);
  45     }
  46   return __recv_alias (__fd, __buf, __n, __flags);
  47 }
  48
  49 extern ssize_t __recvfrom_chk (int __fd, void *__restrict __buf, size_t __n,
  50                                size_t __buflen, int __flags,
  51                                __SOCKADDR_ARG __addr,
  52                                socklen_t *__restrict __addr_len);
  53 extern ssize_t __REDIRECT (__recvfrom_alias,
  54                            (int __fd, void *__restrict __buf, size_t __n,
  55                             int __flags, __SOCKADDR_ARG __addr,
  56                             socklen_t *__restrict __addr_len), recvfrom);
  57 extern ssize_t __REDIRECT (__recvfrom_chk_warn,
  58                            (int __fd, void *__restrict __buf, size_t __n,
  59                             size_t __buflen, int __flags,
  60                             __SOCKADDR_ARG __addr,
  61                             socklen_t *__restrict __addr_len), __recvfrom_chk)
  62      __warnattr ("recvfrom called with bigger length than size of "
  63                  "destination buffer");
  64
  65 __fortify_function ssize_t
  66 recvfrom (int __fd, void *__restrict __buf, size_t __n, int __flags,
  67           __SOCKADDR_ARG __addr, socklen_t *__restrict __addr_len)
  68 {
  69   if (__glibc_objsize0 (__buf) != (size_t) -1)
  70     {
  71       if (!__builtin_constant_p (__n))
  72         return __recvfrom_chk (__fd, __buf, __n, __glibc_objsize0 (__buf),
  73                                __flags, __addr, __addr_len);
  74       if (__n > __glibc_objsize0 (__buf))
  75         return __recvfrom_chk_warn (__fd, __buf, __n, __glibc_objsize0 (__buf),
  76                                     __flags, __addr, __addr_len);
  77     }
  78   return __recvfrom_alias (__fd, __buf, __n, __flags, __addr, __addr_len);
  79 }