1/* Checking macros for socket functions.
2 Copyright (C) 2005-2026 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}