glibc (2.38)

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       1  /* Checking macros for socket functions.
       2     Copyright (C) 2005-2023 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  #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    size_t sz = __glibc_objsize0 (__buf);
      37    if (__glibc_safe_or_unknown_len (__n, sizeof (char), sz))
      38      return __recv_alias (__fd, __buf, __n, __flags);
      39    if (__glibc_unsafe_len (__n, sizeof (char), sz))
      40      return __recv_chk_warn (__fd, __buf, __n, sz, __flags);
      41    return __recv_chk (__fd, __buf, __n, sz, __flags);
      42  }
      43  
      44  extern ssize_t __recvfrom_chk (int __fd, void *__restrict __buf, size_t __n,
      45  			       size_t __buflen, int __flags,
      46  			       __SOCKADDR_ARG __addr,
      47  			       socklen_t *__restrict __addr_len);
      48  extern ssize_t __REDIRECT (__recvfrom_alias,
      49  			   (int __fd, void *__restrict __buf, size_t __n,
      50  			    int __flags, __SOCKADDR_ARG __addr,
      51  			    socklen_t *__restrict __addr_len), recvfrom);
      52  extern ssize_t __REDIRECT (__recvfrom_chk_warn,
      53  			   (int __fd, void *__restrict __buf, size_t __n,
      54  			    size_t __buflen, int __flags,
      55  			    __SOCKADDR_ARG __addr,
      56  			    socklen_t *__restrict __addr_len), __recvfrom_chk)
      57       __warnattr ("recvfrom called with bigger length than size of "
      58  		 "destination buffer");
      59  
      60  __fortify_function ssize_t
      61  recvfrom (int __fd, void *__restrict __buf, size_t __n, int __flags,
      62  	  __SOCKADDR_ARG __addr, socklen_t *__restrict __addr_len)
      63  {
      64    size_t sz = __glibc_objsize0 (__buf);
      65    if (__glibc_safe_or_unknown_len (__n, sizeof (char), sz))
      66      return __recvfrom_alias (__fd, __buf, __n, __flags, __addr, __addr_len);
      67    if (__glibc_unsafe_len (__n, sizeof (char), sz))
      68      return __recvfrom_chk_warn (__fd, __buf, __n, sz, __flags, __addr,
      69  				__addr_len);
      70    return __recvfrom_chk (__fd, __buf, __n, sz, __flags, __addr, __addr_len);
      71  }