1 /* Fetch the host's network interface list. Hurd version.
2 Copyright (C) 2002-2022 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 #include <ifreq.h>
20 #include <hurd.h>
21 #include <hurd/pfinet.h>
22 #include <sys/mman.h>
23
24
25 void
__ifreq(struct ifreq ** ifreqs,int * num_ifs,int sockfd)26 __ifreq (struct ifreq **ifreqs, int *num_ifs, int sockfd)
27 {
28 file_t server;
29
30 server = _hurd_socket_server (PF_INET, 0);
31 if (server == MACH_PORT_NULL)
32 {
33 out:
34 *num_ifs = 0;
35 *ifreqs = NULL;
36 }
37 else
38 {
39 char *data = NULL;
40 size_t len = 0;
41 error_t err = __pfinet_siocgifconf (server, -1, &data, &len);
42 if (err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED)
43 {
44 /* On the first use of the socket server during the operation,
45 allow for the old server port dying. */
46 server = _hurd_socket_server (PF_INET, 1);
47 if (server == MACH_PORT_NULL)
48 goto out;
49 err = __pfinet_siocgifconf (server, -1, (data_t *) ifreqs, &len);
50 }
51 if (err)
52 goto out;
53
54 if (len % sizeof (struct ifreq) != 0)
55 {
56 __munmap (data, len);
57 errno = EGRATUITOUS;
58 goto out;
59 }
60 *num_ifs = len / sizeof (struct ifreq);
61 *ifreqs = (struct ifreq *) data;
62 }
63
64 }
65