1 /* Copyright (C) 1992-2022 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 <errno.h>
19 #include <string.h>
20 #include <sys/socket.h>
21
22 #include <hurd.h>
23 #include <hurd/fd.h>
24 #include <hurd/socket.h>
25
26 /* Put the address of the peer connected to socket FD into *ADDR
27 (which is *LEN bytes long), and its actual length into *LEN. */
28 int
__getpeername(int fd,__SOCKADDR_ARG addrarg,socklen_t * len)29 __getpeername (int fd, __SOCKADDR_ARG addrarg, socklen_t *len)
30 {
31 error_t err;
32 mach_msg_type_number_t buflen = *len;
33 int type;
34 struct sockaddr *addr = addrarg.__sockaddr__;
35 char *buf = (char *) addr;
36 addr_port_t aport;
37
38 if (err = HURD_DPORT_USE (fd, __socket_peername (port, &aport)))
39 return __hurd_dfail (fd, err);
40
41 err = __socket_whatis_address (aport, &type, &buf, &buflen);
42 __mach_port_deallocate (__mach_task_self (), aport);
43
44 if (err)
45 return __hurd_dfail (fd, err);
46
47 if (*len > buflen)
48 *len = buflen;
49
50 if (buf != (char *) addr)
51 {
52 memcpy (addr, buf, *len);
53 __vm_deallocate (__mach_task_self (), (vm_address_t) buf, buflen);
54 }
55
56 const sa_family_t family = type;
57 if (*len > offsetof (struct sockaddr, sa_family))
58 {
59 if (*len < (char *) (&addr->sa_family + 1) - (char *) addr)
60 memcpy (&addr->sa_family, &family,
61 *len - offsetof (struct sockaddr, sa_family));
62 else
63 addr->sa_family = family;
64 }
65
66 return 0;
67 }
68
69 weak_alias (__getpeername, getpeername)
70