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115 lines
3.6 KiB
C
115 lines
3.6 KiB
C
/* Test entering namespaces.
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Copyright (C) 2016-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <support/check.h>
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#include <support/namespace.h>
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#include <support/xsocket.h>
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#include <support/xunistd.h>
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/* Check that the loopback interface provides multiple addresses which
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can be used to run independent servers. */
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static void
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test_localhost_bind (void)
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{
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printf ("info: testing loopback interface with multiple addresses\n");
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/* Create the two server addresses. */
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static const struct addrinfo hints =
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{
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.ai_family = AF_INET,
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.ai_socktype = SOCK_DGRAM,
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.ai_protocol = IPPROTO_UDP,
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};
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struct addrinfo *ai[3];
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TEST_VERIFY_EXIT (getaddrinfo ("127.0.0.1", "53", &hints, ai + 0) == 0);
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TEST_VERIFY_EXIT (getaddrinfo ("127.0.0.2", "53", &hints, ai + 1) == 0);
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TEST_VERIFY_EXIT (getaddrinfo ("127.0.0.3", "53", &hints, ai + 2) == 0);
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/* Create the server scokets and bind them to these addresses. */
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int sockets[3];
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for (int i = 0; i < 3; ++i)
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{
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sockets[i] = xsocket
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(ai[i]->ai_family, ai[i]->ai_socktype, ai[i]->ai_protocol);
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xbind (sockets[i], ai[i]->ai_addr, ai[i]->ai_addrlen);
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}
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/* Send two packets to each server. */
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int client = xsocket (AF_INET, SOCK_DGRAM, IPPROTO_UDP);
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for (int i = 0; i < 3; ++i)
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{
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TEST_VERIFY (sendto (client, &i, sizeof (i), 0,
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ai[i]->ai_addr, ai[i]->ai_addrlen) == sizeof (i));
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int j = i + 256;
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TEST_VERIFY (sendto (client, &j, sizeof (j), 0,
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ai[i]->ai_addr, ai[i]->ai_addrlen) == sizeof (j));
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}
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/* Check that the packets can be received with the expected
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contents. Note that the receive calls interleave differently,
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which hopefully proves that the sockets are, indeed,
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independent. */
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for (int i = 0; i < 3; ++i)
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{
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int buf;
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TEST_VERIFY (recv (sockets[i], &buf, sizeof (buf), 0) == sizeof (buf));
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TEST_VERIFY (buf == i);
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}
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for (int i = 0; i < 3; ++i)
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{
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int buf;
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TEST_VERIFY (recv (sockets[i], &buf, sizeof (buf), 0) == sizeof (buf));
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TEST_VERIFY (buf == i + 256);
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/* Check that there is no more data to receive. */
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TEST_VERIFY (recv (sockets[i], &buf, sizeof (buf), MSG_DONTWAIT) == -1);
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TEST_VERIFY (errno == EWOULDBLOCK || errno == EAGAIN);
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}
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/* Close all sockets and free the addresses. */
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for (int i = 0; i < 3; ++i)
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{
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freeaddrinfo (ai[i]);
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xclose (sockets[i]);
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}
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xclose (client);
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}
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static int
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do_test (void)
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{
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bool root = support_become_root ();
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if (root)
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printf ("info: acquired root-like privileges\n");
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bool netns = support_enter_network_namespace ();
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if (netns)
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printf ("info: entered network namespace\n");
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if (support_in_uts_namespace ())
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printf ("info: also entered UTS namespace\n");
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if (root && netns)
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test_localhost_bind ();
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return 0;
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}
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#include <support/test-driver.c>
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