1 /*-
2 * Copyright (c) 2005 Robert N. M. Watson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29 #include <sys/types.h>
30 #include <sys/socket.h>
31
32 #include <netinet/in.h>
33
34 #include <err.h>
35 #include <errno.h>
36 #include <signal.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <string.h>
40 #include <unistd.h>
41
42 /*
43 * This regression test is intended to verify whether or not SIGPIPE is
44 * properly generated in several simple test cases, as well as testing
45 * whether SO_NOSIGPIPE disables SIGPIPE, if available on the system.
46 * SIGPIPE is generated if a write or send is attempted on a socket that has
47 * been shutdown for write. This test runs several test cases with UNIX
48 * domain sockets and TCP sockets to confirm that either EPIPE or SIGPIPE is
49 * properly returned.
50 *
51 * For the purposes of testing TCP, an unused port number must be specified.
52 */
53 static void
usage(void)54 usage(void)
55 {
56
57 errx(-1, "usage: sigpipe tcpport");
58 }
59
60 /*
61 * Signal catcher. Set a global flag that can be tested by the caller.
62 */
63 static int signaled;
64 static int
got_signal(void)65 got_signal(void)
66 {
67
68 return (signaled);
69 }
70
71 static void
signal_handler(int signum)72 signal_handler(int signum)
73 {
74
75 signaled = 1;
76 }
77
78 static void
signal_setup(const char * testname)79 signal_setup(const char *testname)
80 {
81
82 signaled = 0;
83 if (signal(SIGPIPE, signal_handler) == SIG_ERR)
84 err(-1, "%s: signal(SIGPIPE)", testname);
85 }
86
87 static void
test_send(const char * testname,int sock)88 test_send(const char *testname, int sock)
89 {
90 ssize_t len;
91 char ch;
92
93 ch = 0;
94 len = send(sock, &ch, sizeof(ch), 0);
95 if (len < 0) {
96 if (errno == EPIPE)
97 return;
98 err(-1, "%s: send", testname);
99 }
100 errx(-1, "%s: send: returned %d", testname, len);
101 }
102
103 static void
test_write(const char * testname,int sock)104 test_write(const char *testname, int sock)
105 {
106 ssize_t len;
107 char ch;
108
109 ch = 0;
110 len = write(sock, &ch, sizeof(ch));
111 if (len < 0) {
112 if (errno == EPIPE)
113 return;
114 err(-1, "%s: write", testname);
115 }
116 errx(-1, "%s: write: returned %d", testname, len);
117 }
118
119 static void
test_send_wantsignal(const char * testname,int sock1,int sock2)120 test_send_wantsignal(const char *testname, int sock1, int sock2)
121 {
122
123 if (shutdown(sock2, SHUT_WR) < 0)
124 err(-1, "%s: shutdown", testname);
125 signal_setup(testname);
126 test_send(testname, sock2);
127 if (!got_signal())
128 errx(-1, "%s: send: didn't receive SIGPIPE", testname);
129 close(sock1);
130 close(sock2);
131 }
132
133 #ifdef SO_NOSIGPIPE
134 static void
test_send_dontsignal(const char * testname,int sock1,int sock2)135 test_send_dontsignal(const char *testname, int sock1, int sock2)
136 {
137 int i;
138
139 i = 1;
140 if (setsockopt(sock2, SOL_SOCKET, SO_NOSIGPIPE, &i, sizeof(i)) < 0)
141 err(-1, "%s: setsockopt(SOL_SOCKET, SO_NOSIGPIPE)", testname);
142 if (shutdown(sock2, SHUT_WR) < 0)
143 err(-1, "%s: shutdown", testname);
144 signal_setup(testname);
145 test_send(testname, sock2);
146 if (got_signal())
147 errx(-1, "%s: send: got SIGPIPE", testname);
148 close(sock1);
149 close(sock2);
150 }
151 #endif
152
153 static void
test_write_wantsignal(const char * testname,int sock1,int sock2)154 test_write_wantsignal(const char *testname, int sock1, int sock2)
155 {
156
157 if (shutdown(sock2, SHUT_WR) < 0)
158 err(-1, "%s: shutdown", testname);
159 signal_setup(testname);
160 test_write(testname, sock2);
161 if (!got_signal())
162 errx(-1, "%s: write: didn't receive SIGPIPE", testname);
163 close(sock1);
164 close(sock2);
165 }
166
167 #ifdef SO_NOSIGPIPE
168 static void
test_write_dontsignal(const char * testname,int sock1,int sock2)169 test_write_dontsignal(const char *testname, int sock1, int sock2)
170 {
171 int i;
172
173 i = 1;
174 if (setsockopt(sock2, SOL_SOCKET, SO_NOSIGPIPE, &i, sizeof(i)) < 0)
175 err(-1, "%s: setsockopt(SOL_SOCKET, SO_NOSIGPIPE)", testname);
176 if (shutdown(sock2, SHUT_WR) < 0)
177 err(-1, "%s: shutdown", testname);
178 signal_setup(testname);
179 test_write(testname, sock2);
180 if (got_signal())
181 errx(-1, "%s: write: got SIGPIPE", testname);
182 close(sock1);
183 close(sock2);
184 }
185 #endif
186
187 static int listen_sock;
188 static void
tcp_setup(u_short port)189 tcp_setup(u_short port)
190 {
191 struct sockaddr_in sin;
192
193 listen_sock = socket(PF_INET, SOCK_STREAM, 0);
194 if (listen_sock < 0)
195 err(-1, "tcp_setup: listen");
196
197 bzero(&sin, sizeof(sin));
198 sin.sin_len = sizeof(sin);
199 sin.sin_family = AF_INET;
200 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
201 sin.sin_port = htons(port);
202
203 if (bind(listen_sock, (struct sockaddr *)&sin, sizeof(sin)) < 0)
204 err(-1, "tcp_setup: bind");
205
206 if (listen(listen_sock, -1) < 0)
207 err(-1, "tcp_setup: listen");
208 }
209
210 static void
tcp_teardown(void)211 tcp_teardown(void)
212 {
213
214 close(listen_sock);
215 }
216
217 static void
tcp_pair(u_short port,int sock[2])218 tcp_pair(u_short port, int sock[2])
219 {
220 int accept_sock, connect_sock;
221 struct sockaddr_in sin;
222 socklen_t len;
223
224 connect_sock = socket(PF_INET, SOCK_STREAM, 0);
225 if (connect_sock < 0)
226 err(-1, "tcp_pair: socket");
227
228 bzero(&sin, sizeof(sin));
229 sin.sin_len = sizeof(sin);
230 sin.sin_family = AF_INET;
231 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
232 sin.sin_port = htons(port);
233
234 if (connect(connect_sock, (struct sockaddr *)&sin, sizeof(sin)) < 0)
235 err(-1, "tcp_pair: connect");
236
237 sleep(1); /* Time for TCP to settle. */
238
239 len = sizeof(sin);
240 accept_sock = accept(listen_sock, (struct sockaddr *)&sin, &len);
241 if (accept_sock < 0)
242 err(-1, "tcp_pair: accept");
243
244 sleep(1); /* Time for TCP to settle. */
245
246 sock[0] = accept_sock;
247 sock[1] = connect_sock;
248 }
249
250 int
main(int argc,char * argv[])251 main(int argc, char *argv[])
252 {
253 char *dummy;
254 int sock[2];
255 long port;
256
257 if (argc != 2)
258 usage();
259
260 port = strtol(argv[1], &dummy, 10);
261 if (port < 0 || port > 65535 || *dummy != '\0')
262 usage();
263
264 #ifndef SO_NOSIGPIPE
265 warnx("sigpipe: SO_NOSIGPIPE not defined, skipping some tests");
266 #endif
267
268 /*
269 * UNIX domain socketpair().
270 */
271 if (socketpair(PF_LOCAL, SOCK_STREAM, 0, sock) < 0)
272 err(-1, "socketpair(PF_LOCAL, SOCK_STREAM)");
273 test_send_wantsignal("test_send_wantsignal(PF_LOCAL)", sock[0],
274 sock[1]);
275
276 #ifdef SO_NOSIGPIPE
277 if (socketpair(PF_LOCAL, SOCK_STREAM, 0, sock) < 0)
278 err(-1, "socketpair(PF_LOCAL, SOCK_STREAM)");
279 test_send_dontsignal("test_send_dontsignal(PF_LOCAL)", sock[0],
280 sock[1]);
281 #endif
282
283 if (socketpair(PF_LOCAL, SOCK_STREAM, 0, sock) < 0)
284 err(-1, "socketpair(PF_LOCAL, SOCK_STREAM)");
285 test_write_wantsignal("test_write_wantsignal(PF_LOCAL)", sock[0],
286 sock[1]);
287
288 #ifdef SO_NOSIGPIPE
289 if (socketpair(PF_LOCAL, SOCK_STREAM, 0, sock) < 0)
290 err(-1, "socketpair(PF_LOCAL, SOCK_STREAM)");
291 test_write_dontsignal("test_write_dontsignal(PF_LOCAL)", sock[0],
292 sock[1]);
293 #endif
294
295 /*
296 * TCP.
297 */
298 tcp_setup(port);
299 tcp_pair(port, sock);
300 test_send_wantsignal("test_send_wantsignal(PF_INET)", sock[0],
301 sock[1]);
302
303 #ifdef SO_NOSIGPIPE
304 tcp_pair(port, sock);
305 test_send_dontsignal("test_send_dontsignal(PF_INET)", sock[0],
306 sock[1]);
307 #endif
308
309 tcp_pair(port, sock);
310 test_write_wantsignal("test_write_wantsignal(PF_INET)", sock[0],
311 sock[1]);
312
313 #ifdef SO_NOSIGPIPE
314 tcp_pair(port, sock);
315 test_write_dontsignal("test_write_dontsignal(PF_INET)", sock[0],
316 sock[1]);
317 #endif
318 tcp_teardown();
319
320 fprintf(stderr, "PASS\n");
321 return (0);
322 }
323