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cf0bd2f7 | 1 | /* Test that garbage packets do not affect timeout handling. |
04277e02 | 2 | Copyright (C) 2017-2019 Free Software Foundation, Inc. |
cf0bd2f7 FW |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
cf0bd2f7 FW |
18 | |
19 | #include <netinet/in.h> | |
20 | #include <rpc/clnt.h> | |
21 | #include <rpc/svc.h> | |
22 | #include <stdbool.h> | |
23 | #include <support/check.h> | |
24 | #include <support/namespace.h> | |
25 | #include <support/xsocket.h> | |
26 | #include <support/xthread.h> | |
27 | #include <sys/socket.h> | |
28 | #include <unistd.h> | |
29 | ||
30 | /* Descriptor for the server UDP socket. */ | |
31 | static int server_fd; | |
32 | ||
33 | static void * | |
34 | garbage_sender_thread (void *unused) | |
35 | { | |
36 | while (true) | |
37 | { | |
38 | struct sockaddr_storage sa; | |
39 | socklen_t salen = sizeof (sa); | |
40 | char buf[1]; | |
41 | if (recvfrom (server_fd, buf, sizeof (buf), 0, | |
42 | (struct sockaddr *) &sa, &salen) < 0) | |
43 | FAIL_EXIT1 ("recvfrom: %m"); | |
44 | ||
45 | /* Send garbage packets indefinitely. */ | |
46 | buf[0] = 0; | |
47 | while (true) | |
48 | { | |
49 | /* sendto can fail if the client closed the socket. */ | |
50 | if (sendto (server_fd, buf, sizeof (buf), 0, | |
51 | (struct sockaddr *) &sa, salen) < 0) | |
52 | break; | |
53 | ||
54 | /* Wait a bit, to avoid burning too many CPU cycles in a | |
55 | tight loop. The wait period must be much shorter than | |
56 | the client timeouts configured below. */ | |
57 | usleep (50 * 1000); | |
58 | } | |
59 | } | |
60 | } | |
61 | ||
62 | static int | |
63 | do_test (void) | |
64 | { | |
65 | support_become_root (); | |
66 | support_enter_network_namespace (); | |
67 | ||
68 | server_fd = xsocket (AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_UDP); | |
69 | struct sockaddr_in server_address = | |
70 | { | |
71 | .sin_family = AF_INET, | |
72 | .sin_addr.s_addr = htonl (INADDR_LOOPBACK), | |
73 | }; | |
74 | xbind (server_fd, | |
75 | (struct sockaddr *) &server_address, sizeof (server_address)); | |
76 | { | |
77 | socklen_t sinlen = sizeof (server_address); | |
78 | xgetsockname (server_fd, (struct sockaddr *) &server_address, &sinlen); | |
79 | TEST_VERIFY (sizeof (server_address) == sinlen); | |
80 | } | |
81 | ||
82 | /* Garbage packet source. */ | |
83 | xpthread_detach (xpthread_create (NULL, garbage_sender_thread, NULL)); | |
84 | ||
85 | /* Test client. Use an arbitrary timeout of one second, which is | |
86 | much longer than the garbage packet interval, but still | |
87 | reasonably short, so that the test completes quickly. */ | |
88 | int client_fd = RPC_ANYSOCK; | |
89 | CLIENT *clnt = clntudp_create (&server_address, | |
90 | 1, 2, /* Arbitrary RPC endpoint numbers. */ | |
91 | (struct timeval) { 1, 0 }, | |
92 | &client_fd); | |
93 | if (clnt == NULL) | |
94 | FAIL_EXIT1 ("clntudp_create: %m"); | |
95 | ||
96 | TEST_VERIFY (clnt_call (clnt, 3, /* Arbitrary RPC procedure number. */ | |
97 | (xdrproc_t) xdr_void, NULL, | |
98 | (xdrproc_t) xdr_void, NULL, | |
99 | ((struct timeval) { 1, 0 }))); | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
104 | #include <support/test-driver.c> |