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