1 | /* Test that garbage packets do not affect timeout handling. |
2 | Copyright (C) 2017-2022 Free Software Foundation, Inc. |
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 |
17 | <https://www.gnu.org/licenses/>. */ |
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 (fd: server_fd, buf: buf, n: sizeof (buf), flags: 0, |
42 | addr: (struct sockaddr *) &sa, addr_len: &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 (fd: server_fd, buf: buf, n: sizeof (buf), flags: 0, |
51 | addr: (struct sockaddr *) &sa, addr_len: 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 (useconds: 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 (thr: xpthread_create (NULL, thread_func: 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> |
105 | |