1/* Checking macros for socket functions.
 2   Copyright (C) 2005-2025 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
23extern ssize_t __recv_chk (int __fd, void *__buf, size_t __n, size_t __buflen,
24			   int __flags);
25extern ssize_t __REDIRECT (__recv_alias, (int __fd, void *__buf, size_t __n,
26					  int __flags), recv);
27extern 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 __attribute_overloadable__ ssize_t
34recv (int __fd, __fortify_clang_overload_arg0 (void *, ,__buf), size_t __n,
35      int __flags)
36     __fortify_clang_warning_only_if_bos0_lt (__n, __buf,
37					      "recv called with bigger length than "
38					      "size of destination buffer")
39{
40  size_t __sz = __glibc_objsize0 (__buf);
41  if (__glibc_safe_or_unknown_len (__n, sizeof (char), __sz))
42    return __recv_alias (__fd, __buf, __n, __flags);
43#if !__fortify_use_clang
44  if (__glibc_unsafe_len (__n, sizeof (char), __sz))
45    return __recv_chk_warn (__fd, __buf, __n, __sz, __flags);
46#endif
47  return __recv_chk (__fd, __buf, __n, __sz, __flags);
48}
49
50extern ssize_t __recvfrom_chk (int __fd, void *__restrict __buf, size_t __n,
51			       size_t __buflen, int __flags,
52			       __SOCKADDR_ARG __addr,
53			       socklen_t *__restrict __addr_len);
54extern ssize_t __REDIRECT (__recvfrom_alias,
55			   (int __fd, void *__restrict __buf, size_t __n,
56			    int __flags, __SOCKADDR_ARG __addr,
57			    socklen_t *__restrict __addr_len), recvfrom);
58extern ssize_t __REDIRECT (__recvfrom_chk_warn,
59			   (int __fd, void *__restrict __buf, size_t __n,
60			    size_t __buflen, int __flags,
61			    __SOCKADDR_ARG __addr,
62			    socklen_t *__restrict __addr_len), __recvfrom_chk)
63     __warnattr ("recvfrom called with bigger length than size of "
64		 "destination buffer");
65
66__fortify_function __attribute_overloadable__ ssize_t
67recvfrom (int __fd, __fortify_clang_overload_arg0 (void *, __restrict, __buf),
68	  size_t __n, int __flags,
69	  __SOCKADDR_ARG __addr, socklen_t *__restrict __addr_len)
70     __fortify_clang_warning_only_if_bos0_lt (__n, __buf,
71					      "recvfrom called with bigger length "
72					      "than size of destination buffer")
73{
74  size_t __sz = __glibc_objsize0 (__buf);
75  if (__glibc_safe_or_unknown_len (__n, sizeof (char), __sz))
76    return __recvfrom_alias (__fd, __buf, __n, __flags, __addr, __addr_len);
77#if !__fortify_use_clang
78  if (__glibc_unsafe_len (__n, sizeof (char), __sz))
79    return __recvfrom_chk_warn (__fd, __buf, __n, __sz, __flags, __addr,
80				__addr_len);
81#endif
82  return __recvfrom_chk (__fd, __buf, __n, __sz, __flags, __addr, __addr_len);
83}