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/* Test that garbage packets do not affect timeout handling.
Copyright (C) 2017-2024 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 <netinet/in.h>
#include <rpc/clnt.h>
#include <rpc/svc.h>
#include <stdbool.h>
#include <support/check.h>
#include <support/namespace.h>
#include <support/xsocket.h>
#include <support/xthread.h>
#include <sys/socket.h>
#include <unistd.h>
/* Descriptor for the server UDP socket. */
static int server_fd;
static void *
garbage_sender_thread (void *unused)
{
while (true)
{
struct sockaddr_storage sa;
socklen_t salen = sizeof (sa);
char buf[1];
if (recvfrom (server_fd, buf, sizeof (buf), 0,
(struct sockaddr *) &sa, &salen) < 0)
FAIL_EXIT1 ("recvfrom: %m");
/* Send garbage packets indefinitely. */
buf[0] = 0;
while (true)
{
/* sendto can fail if the client closed the socket. */
if (sendto (server_fd, buf, sizeof (buf), 0,
(struct sockaddr *) &sa, salen) < 0)
break;
/* Wait a bit, to avoid burning too many CPU cycles in a
tight loop. The wait period must be much shorter than
the client timeouts configured below. */
usleep (50 * 1000);
}
}
}
static int
do_test (void)
{
support_become_root ();
support_enter_network_namespace ();
server_fd = xsocket (AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_UDP);
struct sockaddr_in server_address =
{
.sin_family = AF_INET,
.sin_addr.s_addr = htonl (INADDR_LOOPBACK),
};
xbind (server_fd,
(struct sockaddr *) &server_address, sizeof (server_address));
{
socklen_t sinlen = sizeof (server_address);
xgetsockname (server_fd, (struct sockaddr *) &server_address, &sinlen);
TEST_VERIFY (sizeof (server_address) == sinlen);
}
/* Garbage packet source. */
xpthread_detach (xpthread_create (NULL, garbage_sender_thread, NULL));
/* Test client. Use an arbitrary timeout of one second, which is
much longer than the garbage packet interval, but still
reasonably short, so that the test completes quickly. */
int client_fd = RPC_ANYSOCK;
CLIENT *clnt = clntudp_create (&server_address,
1, 2, /* Arbitrary RPC endpoint numbers. */
(struct timeval) { 1, 0 },
&client_fd);
if (clnt == NULL)
FAIL_EXIT1 ("clntudp_create: %m");
TEST_VERIFY (clnt_call (clnt, 3, /* Arbitrary RPC procedure number. */
(xdrproc_t) xdr_void, NULL,
(xdrproc_t) xdr_void, NULL,
((struct timeval) { 1, 0 })));
return 0;
}
#include <support/test-driver.c>
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