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/* Test entering namespaces.
Copyright (C) 2016-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <netdb.h>
#include <stdio.h>
#include <support/check.h>
#include <support/namespace.h>
#include <support/xsocket.h>
#include <support/xunistd.h>
/* Check that the loopback interface provides multiple addresses which
can be used to run independent servers. */
static void
test_localhost_bind (void)
{
printf ("info: testing loopback interface with multiple addresses\n");
/* Create the two server addresses. */
static const struct addrinfo hints =
{
.ai_family = AF_INET,
.ai_socktype = SOCK_DGRAM,
.ai_protocol = IPPROTO_UDP,
};
struct addrinfo *ai[3];
TEST_VERIFY_EXIT (getaddrinfo ("127.0.0.1", "53", &hints, ai + 0) == 0);
TEST_VERIFY_EXIT (getaddrinfo ("127.0.0.2", "53", &hints, ai + 1) == 0);
TEST_VERIFY_EXIT (getaddrinfo ("127.0.0.3", "53", &hints, ai + 2) == 0);
/* Create the server scokets and bind them to these addresses. */
int sockets[3];
for (int i = 0; i < 3; ++i)
{
sockets[i] = xsocket
(ai[i]->ai_family, ai[i]->ai_socktype, ai[i]->ai_protocol);
xbind (sockets[i], ai[i]->ai_addr, ai[i]->ai_addrlen);
}
/* Send two packets to each server. */
int client = xsocket (AF_INET, SOCK_DGRAM, IPPROTO_UDP);
for (int i = 0; i < 3; ++i)
{
TEST_VERIFY (sendto (client, &i, sizeof (i), 0,
ai[i]->ai_addr, ai[i]->ai_addrlen) == sizeof (i));
int j = i + 256;
TEST_VERIFY (sendto (client, &j, sizeof (j), 0,
ai[i]->ai_addr, ai[i]->ai_addrlen) == sizeof (j));
}
/* Check that the packets can be received with the expected
contents. Note that the receive calls interleave differently,
which hopefully proves that the sockets are, indeed,
independent. */
for (int i = 0; i < 3; ++i)
{
int buf;
TEST_VERIFY (recv (sockets[i], &buf, sizeof (buf), 0) == sizeof (buf));
TEST_VERIFY (buf == i);
}
for (int i = 0; i < 3; ++i)
{
int buf;
TEST_VERIFY (recv (sockets[i], &buf, sizeof (buf), 0) == sizeof (buf));
TEST_VERIFY (buf == i + 256);
/* Check that there is no more data to receive. */
TEST_VERIFY (recv (sockets[i], &buf, sizeof (buf), MSG_DONTWAIT) == -1);
TEST_VERIFY (errno == EWOULDBLOCK || errno == EAGAIN);
}
/* Close all sockets and free the addresses. */
for (int i = 0; i < 3; ++i)
{
freeaddrinfo (ai[i]);
xclose (sockets[i]);
}
xclose (client);
}
static int
do_test (void)
{
bool root = support_become_root ();
if (root)
printf ("info: acquired root-like privileges\n");
bool netns = support_enter_network_namespace ();
if (netns)
printf ("info: entered network namespace\n");
if (support_in_uts_namespace ())
printf ("info: also entered UTS namespace\n");
if (root && netns)
test_localhost_bind ();
return 0;
}
#include <support/test-driver.c>
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