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
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 ssize_t
34recv (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
49extern 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);
53extern 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);
57extern 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
66recvfrom (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}
80