1 | /* Test entering namespaces. |
2 | Copyright (C) 2016-2022 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 <errno.h> |
20 | #include <netdb.h> |
21 | #include <stdio.h> |
22 | #include <support/check.h> |
23 | #include <support/namespace.h> |
24 | #include <support/xsocket.h> |
25 | #include <support/xunistd.h> |
26 | |
27 | /* Check that the loopback interface provides multiple addresses which |
28 | can be used to run independent servers. */ |
29 | static void |
30 | test_localhost_bind (void) |
31 | { |
32 | printf (format: "info: testing loopback interface with multiple addresses\n" ); |
33 | |
34 | /* Create the two server addresses. */ |
35 | static const struct addrinfo hints = |
36 | { |
37 | .ai_family = AF_INET, |
38 | .ai_socktype = SOCK_DGRAM, |
39 | .ai_protocol = IPPROTO_UDP, |
40 | }; |
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); |
45 | |
46 | /* Create the server scokets and bind them to these addresses. */ |
47 | int sockets[3]; |
48 | for (int i = 0; i < 3; ++i) |
49 | { |
50 | sockets[i] = xsocket |
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); |
53 | } |
54 | |
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) |
58 | { |
59 | TEST_VERIFY (sendto (client, &i, sizeof (i), 0, |
60 | ai[i]->ai_addr, ai[i]->ai_addrlen) == sizeof (i)); |
61 | int j = i + 256; |
62 | TEST_VERIFY (sendto (client, &j, sizeof (j), 0, |
63 | ai[i]->ai_addr, ai[i]->ai_addrlen) == sizeof (j)); |
64 | } |
65 | |
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, |
69 | independent. */ |
70 | for (int i = 0; i < 3; ++i) |
71 | { |
72 | int buf; |
73 | TEST_VERIFY (recv (sockets[i], &buf, sizeof (buf), 0) == sizeof (buf)); |
74 | TEST_VERIFY (buf == i); |
75 | } |
76 | for (int i = 0; i < 3; ++i) |
77 | { |
78 | int buf; |
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); |
84 | } |
85 | |
86 | /* Close all sockets and free the addresses. */ |
87 | for (int i = 0; i < 3; ++i) |
88 | { |
89 | freeaddrinfo (ai: ai[i]); |
90 | xclose (sockets[i]); |
91 | } |
92 | xclose (client); |
93 | } |
94 | |
95 | |
96 | static int |
97 | do_test (void) |
98 | { |
99 | bool root = support_become_root (); |
100 | if (root) |
101 | printf (format: "info: acquired root-like privileges\n" ); |
102 | bool netns = support_enter_network_namespace (); |
103 | if (netns) |
104 | printf (format: "info: entered network namespace\n" ); |
105 | if (support_in_uts_namespace ()) |
106 | printf (format: "info: also entered UTS namespace\n" ); |
107 | |
108 | if (root && netns) |
109 | test_localhost_bind (); |
110 | |
111 | return 0; |
112 | } |
113 | |
114 | #include <support/test-driver.c> |
115 | |