1 /* Test entering namespaces.
2 Copyright (C) 2016-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
22 #include <support/check.h>
23 #include <support/namespace.h>
24 #include <support/xsocket.h>
25 #include <support/xunistd.h>
27 /* Check that the loopback interface provides multiple addresses which
28 can be used to run independent servers. */
30 test_localhost_bind (void)
32 printf ("info: testing loopback interface with multiple addresses\n");
34 /* Create the two server addresses. */
35 static const struct addrinfo hints =
38 .ai_socktype = SOCK_DGRAM,
39 .ai_protocol = IPPROTO_UDP,
41 struct addrinfo *ai[3];
42 TEST_VERIFY_EXIT (getaddrinfo ("127.0.0.1", "53", &hints, ai + 0) == 0);
43 TEST_VERIFY_EXIT (getaddrinfo ("127.0.0.2", "53", &hints, ai + 1) == 0);
44 TEST_VERIFY_EXIT (getaddrinfo ("127.0.0.3", "53", &hints, ai + 2) == 0);
46 /* Create the server scokets and bind them to these addresses. */
48 for (int i = 0; i < 3; ++i)
51 (ai[i]->ai_family, ai[i]->ai_socktype, ai[i]->ai_protocol);
52 xbind (sockets[i], ai[i]->ai_addr, ai[i]->ai_addrlen);
55 /* Send two packets to each server. */
56 int client = xsocket (AF_INET, SOCK_DGRAM, IPPROTO_UDP);
57 for (int i = 0; i < 3; ++i)
59 TEST_VERIFY (sendto (client, &i, sizeof (i), 0,
60 ai[i]->ai_addr, ai[i]->ai_addrlen) == sizeof (i));
62 TEST_VERIFY (sendto (client, &j, sizeof (j), 0,
63 ai[i]->ai_addr, ai[i]->ai_addrlen) == sizeof (j));
66 /* Check that the packets can be received with the expected
67 contents. Note that the receive calls interleave differently,
68 which hopefully proves that the sockets are, indeed,
70 for (int i = 0; i < 3; ++i)
73 TEST_VERIFY (recv (sockets[i], &buf, sizeof (buf), 0) == sizeof (buf));
74 TEST_VERIFY (buf == i);
76 for (int i = 0; i < 3; ++i)
79 TEST_VERIFY (recv (sockets[i], &buf, sizeof (buf), 0) == sizeof (buf));
80 TEST_VERIFY (buf == i + 256);
81 /* Check that there is no more data to receive. */
82 TEST_VERIFY (recv (sockets[i], &buf, sizeof (buf), MSG_DONTWAIT) == -1);
83 TEST_VERIFY (errno == EWOULDBLOCK || errno == EAGAIN);
86 /* Close all sockets and free the addresses. */
87 for (int i = 0; i < 3; ++i)
99 bool root = support_become_root ();
101 printf ("info: acquired root-like privileges\n");
102 bool netns = support_enter_network_namespace ();
104 printf ("info: entered network namespace\n");
105 if (support_in_uts_namespace ())
106 printf ("info: also entered UTS namespace\n");
109 test_localhost_bind ();
114 #include <support/test-driver.c>