1 /* Copyright (C) 2015-2021 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <sys/socket.h>
19 #include <time.h>
20 #include <sysdep.h>
21 #include <socketcall.h>
22 #include <socket-constants-time64.h>
23
24 static int
getsockopt_syscall(int fd,int level,int optname,void * optval,socklen_t * len)25 getsockopt_syscall (int fd, int level, int optname, void *optval,
26 socklen_t *len)
27 {
28 #ifdef __ASSUME_GETSOCKOPT_SYSCALL
29 return INLINE_SYSCALL (getsockopt, 5, fd, level, optname, optval, len);
30 #else
31 return SOCKETCALL (getsockopt, fd, level, optname, optval, len);
32 #endif
33 }
34
35 #ifndef __ASSUME_TIME64_SYSCALLS
36 static int
getsockopt32(int fd,int level,int optname,void * optval,socklen_t * len)37 getsockopt32 (int fd, int level, int optname, void *optval,
38 socklen_t *len)
39 {
40 int r = -1;
41
42 if (level != SOL_SOCKET)
43 return r;
44
45 switch (optname)
46 {
47 case COMPAT_SO_RCVTIMEO_NEW:
48 case COMPAT_SO_SNDTIMEO_NEW:
49 {
50 if (optname == COMPAT_SO_RCVTIMEO_NEW)
51 optname = COMPAT_SO_RCVTIMEO_OLD;
52 if (optname == COMPAT_SO_SNDTIMEO_NEW)
53 optname = COMPAT_SO_SNDTIMEO_OLD;
54
55 struct __timeval32 tv32;
56 r = getsockopt_syscall (fd, level, optname, &tv32,
57 (socklen_t[]) { sizeof tv32 });
58 if (r < 0)
59 break;
60
61 /* POSIX states that if the size of the option value is greater than
62 then option length, the option value argument shall be silently
63 truncated. */
64 if (*len >= sizeof (struct __timeval64))
65 {
66 struct __timeval64 *tv64 = (struct __timeval64 *) optval;
67 *tv64 = valid_timeval32_to_timeval64 (tv32);
68 *len = sizeof (*tv64);
69 }
70 else
71 memcpy (optval, &tv32, sizeof tv32);
72 }
73 break;
74
75 case COMPAT_SO_TIMESTAMP_NEW:
76 case COMPAT_SO_TIMESTAMPNS_NEW:
77 {
78 if (optname == COMPAT_SO_TIMESTAMP_NEW)
79 optname = COMPAT_SO_TIMESTAMP_OLD;
80 if (optname == COMPAT_SO_TIMESTAMPNS_NEW)
81 optname = COMPAT_SO_TIMESTAMPNS_OLD;
82 r = getsockopt_syscall (fd, level, optname, optval, len);
83 }
84 break;
85 }
86
87 return r;
88 }
89 #endif
90
91 int
__getsockopt(int fd,int level,int optname,void * optval,socklen_t * len)92 __getsockopt (int fd, int level, int optname, void *optval, socklen_t *len)
93 {
94 int r = getsockopt_syscall (fd, level, optname, optval, len);
95
96 #ifndef __ASSUME_TIME64_SYSCALLS
97 if (r == -1 && errno == ENOPROTOOPT)
98 r = getsockopt32 (fd, level, optname, optval, len);
99 #endif
100
101 return r;
102 }
103 weak_alias (__getsockopt, getsockopt)
104 #if __TIMESIZE != 64
105 weak_alias (__getsockopt, __getsockopt64)
106 #endif
107