glibc/sunrpc/tst-udp-nonblocking.c

334 lines
9.8 KiB
C

/* Test non-blocking use of the UDP client.
Copyright (C) 2017 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
<http://www.gnu.org/licenses/>. */
#include <netinet/in.h>
#include <rpc/clnt.h>
#include <rpc/svc.h>
#include <stdbool.h>
#include <string.h>
#include <support/check.h>
#include <support/namespace.h>
#include <support/test-driver.h>
#include <support/xsocket.h>
#include <support/xunistd.h>
#include <sys/socket.h>
#include <time.h>
#include <unistd.h>
/* Test data serialization and deserialization. */
struct test_query
{
uint32_t a;
uint32_t b;
uint32_t timeout_ms;
};
static bool_t
xdr_test_query (XDR *xdrs, void *data, ...)
{
struct test_query *p = data;
return xdr_uint32_t (xdrs, &p->a)
&& xdr_uint32_t (xdrs, &p->b)
&& xdr_uint32_t (xdrs, &p->timeout_ms);
}
struct test_response
{
uint32_t server_id;
uint32_t seq;
uint32_t sum;
};
static bool_t
xdr_test_response (XDR *xdrs, void *data, ...)
{
struct test_response *p = data;
return xdr_uint32_t (xdrs, &p->server_id)
&& xdr_uint32_t (xdrs, &p->seq)
&& xdr_uint32_t (xdrs, &p->sum);
}
/* Implementation of the test server. */
enum
{
/* Number of test servers to run. */
SERVER_COUNT = 3,
/* RPC parameters, chosen at random. */
PROGNUM = 8242,
VERSNUM = 19654,
/* Main RPC operation. */
PROC_ADD = 1,
/* Request process termination. */
PROC_EXIT,
/* Special exit status to mark successful processing. */
EXIT_MARKER = 55,
};
/* Set by the parent process to tell test servers apart. */
static int server_id;
/* Implementation of the test server. */
static void
server_dispatch (struct svc_req *request, SVCXPRT *transport)
{
/* Query sequence number. */
static uint32_t seq = 0;
++seq;
static bool proc_add_seen;
if (test_verbose)
printf ("info: server_dispatch server_id=%d seq=%u rq_proc=%lu\n",
server_id, seq, request->rq_proc);
switch (request->rq_proc)
{
case PROC_ADD:
{
struct test_query query;
memset (&query, 0xc0, sizeof (query));
TEST_VERIFY_EXIT
(svc_getargs (transport, xdr_test_query,
(void *) &query));
if (test_verbose)
printf (" a=%u b=%u timeout_ms=%u\n",
query.a, query.b, query.timeout_ms);
usleep (query.timeout_ms * 1000);
struct test_response response =
{
.server_id = server_id,
.seq = seq,
.sum = query.a + query.b,
};
TEST_VERIFY (svc_sendreply (transport, xdr_test_response,
(void *) &response));
if (test_verbose)
printf (" server id %d response seq=%u sent\n", server_id, seq);
proc_add_seen = true;
}
break;
case PROC_EXIT:
TEST_VERIFY (proc_add_seen);
TEST_VERIFY (svc_sendreply (transport, (xdrproc_t) xdr_void, NULL));
_exit (EXIT_MARKER);
break;
default:
FAIL_EXIT1 ("invalid rq_proc value: %lu", request->rq_proc);
break;
}
}
/* Return the number seconds since an arbitrary point in time. */
static double
get_ticks (void)
{
{
struct timespec ts;
if (clock_gettime (CLOCK_MONOTONIC, &ts) == 0)
return ts.tv_sec + ts.tv_nsec * 1e-9;
}
{
struct timeval tv;
TEST_VERIFY_EXIT (gettimeofday (&tv, NULL) == 0);
return tv.tv_sec + tv.tv_usec * 1e-6;
}
}
static int
do_test (void)
{
support_become_root ();
support_enter_network_namespace ();
/* Information about the test servers. */
struct
{
SVCXPRT *transport;
struct sockaddr_in address;
pid_t pid;
uint32_t xid;
} servers[SERVER_COUNT];
/* Spawn the test servers. */
for (int i = 0; i < SERVER_COUNT; ++i)
{
servers[i].transport = svcudp_create (RPC_ANYSOCK);
TEST_VERIFY_EXIT (servers[i].transport != NULL);
servers[i].address = (struct sockaddr_in)
{
.sin_family = AF_INET,
.sin_addr.s_addr = htonl (INADDR_LOOPBACK),
.sin_port = htons (servers[i].transport->xp_port),
};
servers[i].xid = 0xabcd0101 + i;
if (test_verbose)
printf ("info: setting up server %d xid=%x on port %d\n",
i, servers[i].xid, servers[i].transport->xp_port);
server_id = i;
servers[i].pid = xfork ();
if (servers[i].pid == 0)
{
TEST_VERIFY (svc_register (servers[i].transport,
PROGNUM, VERSNUM, server_dispatch, 0));
svc_run ();
FAIL_EXIT1 ("supposed to be unreachable");
}
/* We need to close the socket so that we do not accidentally
consume the request. */
TEST_VERIFY (close (servers[i].transport->xp_sock) == 0);
}
/* The following code mirrors what ypbind does. */
/* Copied from clnt_udp.c (like ypbind). */
struct cu_data
{
int cu_sock;
bool_t cu_closeit;
struct sockaddr_in cu_raddr;
int cu_rlen;
struct timeval cu_wait;
struct timeval cu_total;
struct rpc_err cu_error;
XDR cu_outxdrs;
u_int cu_xdrpos;
u_int cu_sendsz;
char *cu_outbuf;
u_int cu_recvsz;
char cu_inbuf[1];
};
int client_socket = xsocket (AF_INET, SOCK_DGRAM | SOCK_NONBLOCK, 0);
CLIENT *clnt = clntudp_create (&servers[0].address, PROGNUM, VERSNUM,
/* 5 seconds per-response timeout. */
((struct timeval) { 5, 0 }),
&client_socket);
TEST_VERIFY (clnt != NULL);
clnt->cl_auth = authunix_create_default ();
{
struct timeval zero = { 0, 0 };
TEST_VERIFY (clnt_control (clnt, CLSET_TIMEOUT, (void *) &zero));
}
/* Poke at internal data structures (like ypbind). */
struct cu_data *cu = (struct cu_data *) clnt->cl_private;
/* Send a ping to each server. */
double before_pings = get_ticks ();
for (int i = 0; i < SERVER_COUNT; ++i)
{
if (test_verbose)
printf ("info: sending server %d ping\n", i);
/* Reset the xid because it is changed by each invocation of
clnt_call. Subtract one to compensate for the xid update
during the call. */
*((uint32_t *) (cu->cu_outbuf)) = servers[i].xid - 1;
cu->cu_raddr = servers[i].address;
struct test_query query = { .a = 100, .b = i + 1 };
if (i == 1)
/* Shorter timeout to prefer this server. These timeouts must
be much shorter than the 5-second per-response timeout
configured with clntudp_create. */
query.timeout_ms = 750;
else
query.timeout_ms = 1500;
struct test_response response = { 0 };
/* NB: Do not check the return value. The server reply will
prove that the call worked. */
double before_one_ping = get_ticks ();
clnt_call (clnt, PROC_ADD,
xdr_test_query, (void *) &query,
xdr_test_response, (void *) &response,
((struct timeval) { 0, 0 }));
double after_one_ping = get_ticks ();
if (test_verbose)
printf ("info: non-blocking send took %f seconds\n",
after_one_ping - before_one_ping);
/* clnt_call should return immediately. Accept some delay in
case the process is descheduled. */
TEST_VERIFY (after_one_ping - before_one_ping < 0.3);
}
/* Collect the non-blocking response. */
if (test_verbose)
printf ("info: collecting response\n");
struct test_response response = { 0 };
TEST_VERIFY
(clnt_call (clnt, PROC_ADD, NULL, NULL,
xdr_test_response, (void *) &response,
((struct timeval) { 0, 0 })) == RPC_SUCCESS);
double after_pings = get_ticks ();
if (test_verbose)
printf ("info: send/receive took %f seconds\n",
after_pings - before_pings);
/* Expected timeout is 0.75 seconds. */
TEST_VERIFY (0.75 <= after_pings - before_pings);
TEST_VERIFY (after_pings - before_pings < 1.2);
uint32_t xid;
memcpy (&xid, &cu->cu_inbuf, sizeof (xid));
if (test_verbose)
printf ("info: non-blocking response: xid=%x server_id=%u seq=%u sum=%u\n",
xid, response.server_id, response.seq, response.sum);
/* Check that the reply from the preferred server was used. */
TEST_VERIFY (servers[1].xid == xid);
TEST_VERIFY (response.server_id == 1);
TEST_VERIFY (response.seq == 1);
TEST_VERIFY (response.sum == 102);
auth_destroy (clnt->cl_auth);
clnt_destroy (clnt);
for (int i = 0; i < SERVER_COUNT; ++i)
{
if (test_verbose)
printf ("info: requesting server %d termination\n", i);
client_socket = RPC_ANYSOCK;
clnt = clntudp_create (&servers[i].address, PROGNUM, VERSNUM,
((struct timeval) { 5, 0 }),
&client_socket);
TEST_VERIFY_EXIT (clnt != NULL);
TEST_VERIFY (clnt_call (clnt, PROC_EXIT,
(xdrproc_t) xdr_void, NULL,
(xdrproc_t) xdr_void, NULL,
((struct timeval) { 3, 0 })) == RPC_SUCCESS);
clnt_destroy (clnt);
int status;
xwaitpid (servers[i].pid, &status, 0);
TEST_VERIFY (WIFEXITED (status) && WEXITSTATUS (status) == EXIT_MARKER);
}
return 0;
}
#include <support/test-driver.c>