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
27 #include <sys/types.h>
28 #include <sys/socket.h>
29
30 #include <netinet/in.h>
31
32 #include <err.h>
33 #include <errno.h>
34 #include <signal.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <unistd.h>
39
40 /*
41 * This regression test is intended to verify whether or not SIGPIPE is
42 * properly generated in several simple test cases, as well as testing
43 * whether SO_NOSIGPIPE disables SIGPIPE, if available on the system.
44 * SIGPIPE is generated if a write or send is attempted on a socket that has
45 * been shutdown for write. This test runs several test cases with UNIX
46 * domain sockets and TCP sockets to confirm that either EPIPE or SIGPIPE is
47 * properly returned.
48 *
49 * For the purposes of testing TCP, an unused port number must be specified.
50 */
51 static void
usage(void)52 usage(void)
53 {
54
55 errx(-1, "usage: sigpipe tcpport");
56 }
57
58 /*
59 * Signal catcher. Set a global flag that can be tested by the caller.
60 */
61 static int signaled;
62 static int
got_signal(void)63 got_signal(void)
64 {
65
66 return (signaled);
67 }
68
69 static void
signal_handler(int signum __unused)70 signal_handler(int signum __unused)
71 {
72
73 signaled = 1;
74 }
75
76 static void
signal_setup(const char * testname)77 signal_setup(const char *testname)
78 {
79
80 signaled = 0;
81 if (signal(SIGPIPE, signal_handler) == SIG_ERR)
82 err(-1, "%s: signal(SIGPIPE)", testname);
83 }
84
85 static void
test_send(const char * testname,int sock)86 test_send(const char *testname, int sock)
87 {
88 ssize_t len;
89 char ch;
90
91 ch = 0;
92 len = send(sock, &ch, sizeof(ch), 0);
93 if (len < 0) {
94 if (errno == EPIPE)
95 return;
96 err(-1, "%s: send", testname);
97 }
98 errx(-1, "%s: send: returned %zd", testname, len);
99 }
100
101 static void
test_write(const char * testname,int sock)102 test_write(const char *testname, int sock)
103 {
104 ssize_t len;
105 char ch;
106
107 ch = 0;
108 len = write(sock, &ch, sizeof(ch));
109 if (len < 0) {
110 if (errno == EPIPE)
111 return;
112 err(-1, "%s: write", testname);
113 }
114 errx(-1, "%s: write: returned %zd", testname, len);
115 }
116
117 static void
test_send_wantsignal(const char * testname,int sock1,int sock2)118 test_send_wantsignal(const char *testname, int sock1, int sock2)
119 {
120
121 if (shutdown(sock2, SHUT_WR) < 0)
122 err(-1, "%s: shutdown", testname);
123 signal_setup(testname);
124 test_send(testname, sock2);
125 if (!got_signal())
126 errx(-1, "%s: send: didn't receive SIGPIPE", testname);
127 close(sock1);
128 close(sock2);
129 }
130
131 #ifdef SO_NOSIGPIPE
132 static void
test_send_dontsignal(const char * testname,int sock1,int sock2)133 test_send_dontsignal(const char *testname, int sock1, int sock2)
134 {
135 int i;
136
137 i = 1;
138 if (setsockopt(sock2, SOL_SOCKET, SO_NOSIGPIPE, &i, sizeof(i)) < 0)
139 err(-1, "%s: setsockopt(SOL_SOCKET, SO_NOSIGPIPE)", testname);
140 if (shutdown(sock2, SHUT_WR) < 0)
141 err(-1, "%s: shutdown", testname);
142 signal_setup(testname);
143 test_send(testname, sock2);
144 if (got_signal())
145 errx(-1, "%s: send: got SIGPIPE", testname);
146 close(sock1);
147 close(sock2);
148 }
149 #endif
150
151 static void
test_write_wantsignal(const char * testname,int sock1,int sock2)152 test_write_wantsignal(const char *testname, int sock1, int sock2)
153 {
154
155 if (shutdown(sock2, SHUT_WR) < 0)
156 err(-1, "%s: shutdown", testname);
157 signal_setup(testname);
158 test_write(testname, sock2);
159 if (!got_signal())
160 errx(-1, "%s: write: didn't receive SIGPIPE", testname);
161 close(sock1);
162 close(sock2);
163 }
164
165 #ifdef SO_NOSIGPIPE
166 static void
test_write_dontsignal(const char * testname,int sock1,int sock2)167 test_write_dontsignal(const char *testname, int sock1, int sock2)
168 {
169 int i;
170
171 i = 1;
172 if (setsockopt(sock2, SOL_SOCKET, SO_NOSIGPIPE, &i, sizeof(i)) < 0)
173 err(-1, "%s: setsockopt(SOL_SOCKET, SO_NOSIGPIPE)", testname);
174 if (shutdown(sock2, SHUT_WR) < 0)
175 err(-1, "%s: shutdown", testname);
176 signal_setup(testname);
177 test_write(testname, sock2);
178 if (got_signal())
179 errx(-1, "%s: write: got SIGPIPE", testname);
180 close(sock1);
181 close(sock2);
182 }
183 #endif
184
185 static int listen_sock;
186 static void
tcp_setup(u_short port)187 tcp_setup(u_short port)
188 {
189 struct sockaddr_in sin;
190
191 listen_sock = socket(PF_INET, SOCK_STREAM, 0);
192 if (listen_sock < 0)
193 err(-1, "tcp_setup: listen");
194
195 bzero(&sin, sizeof(sin));
196 sin.sin_len = sizeof(sin);
197 sin.sin_family = AF_INET;
198 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
199 sin.sin_port = htons(port);
200
201 if (bind(listen_sock, (struct sockaddr *)&sin, sizeof(sin)) < 0)
202 err(-1, "tcp_setup: bind");
203
204 if (listen(listen_sock, -1) < 0)
205 err(-1, "tcp_setup: listen");
206 }
207
208 static void
tcp_teardown(void)209 tcp_teardown(void)
210 {
211
212 close(listen_sock);
213 }
214
215 static void
tcp_pair(u_short port,int sock[2])216 tcp_pair(u_short port, int sock[2])
217 {
218 int accept_sock, connect_sock;
219 struct sockaddr_in sin;
220 socklen_t len;
221
222 connect_sock = socket(PF_INET, SOCK_STREAM, 0);
223 if (connect_sock < 0)
224 err(-1, "tcp_pair: socket");
225
226 bzero(&sin, sizeof(sin));
227 sin.sin_len = sizeof(sin);
228 sin.sin_family = AF_INET;
229 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
230 sin.sin_port = htons(port);
231
232 if (connect(connect_sock, (struct sockaddr *)&sin, sizeof(sin)) < 0)
233 err(-1, "tcp_pair: connect");
234
235 sleep(1); /* Time for TCP to settle. */
236
237 len = sizeof(sin);
238 accept_sock = accept(listen_sock, (struct sockaddr *)&sin, &len);
239 if (accept_sock < 0)
240 err(-1, "tcp_pair: accept");
241
242 sleep(1); /* Time for TCP to settle. */
243
244 sock[0] = accept_sock;
245 sock[1] = connect_sock;
246 }
247
248 int
main(int argc,char * argv[])249 main(int argc, char *argv[])
250 {
251 char *dummy;
252 int sock[2];
253 long port;
254
255 if (argc != 2)
256 usage();
257
258 port = strtol(argv[1], &dummy, 10);
259 if (port < 0 || port > 65535 || *dummy != '\0')
260 usage();
261
262 #ifndef SO_NOSIGPIPE
263 warnx("sigpipe: SO_NOSIGPIPE not defined, skipping some tests");
264 #endif
265
266 /*
267 * UNIX domain socketpair().
268 */
269 if (socketpair(PF_LOCAL, SOCK_STREAM, 0, sock) < 0)
270 err(-1, "socketpair(PF_LOCAL, SOCK_STREAM)");
271 test_send_wantsignal("test_send_wantsignal(PF_LOCAL)", sock[0],
272 sock[1]);
273
274 #ifdef SO_NOSIGPIPE
275 if (socketpair(PF_LOCAL, SOCK_STREAM, 0, sock) < 0)
276 err(-1, "socketpair(PF_LOCAL, SOCK_STREAM)");
277 test_send_dontsignal("test_send_dontsignal(PF_LOCAL)", sock[0],
278 sock[1]);
279 #endif
280
281 if (socketpair(PF_LOCAL, SOCK_STREAM, 0, sock) < 0)
282 err(-1, "socketpair(PF_LOCAL, SOCK_STREAM)");
283 test_write_wantsignal("test_write_wantsignal(PF_LOCAL)", sock[0],
284 sock[1]);
285
286 #ifdef SO_NOSIGPIPE
287 if (socketpair(PF_LOCAL, SOCK_STREAM, 0, sock) < 0)
288 err(-1, "socketpair(PF_LOCAL, SOCK_STREAM)");
289 test_write_dontsignal("test_write_dontsignal(PF_LOCAL)", sock[0],
290 sock[1]);
291 #endif
292
293 /*
294 * TCP.
295 */
296 tcp_setup(port);
297 tcp_pair(port, sock);
298 test_send_wantsignal("test_send_wantsignal(PF_INET)", sock[0],
299 sock[1]);
300
301 #ifdef SO_NOSIGPIPE
302 tcp_pair(port, sock);
303 test_send_dontsignal("test_send_dontsignal(PF_INET)", sock[0],
304 sock[1]);
305 #endif
306
307 tcp_pair(port, sock);
308 test_write_wantsignal("test_write_wantsignal(PF_INET)", sock[0],
309 sock[1]);
310
311 #ifdef SO_NOSIGPIPE
312 tcp_pair(port, sock);
313 test_write_dontsignal("test_write_dontsignal(PF_INET)", sock[0],
314 sock[1]);
315 #endif
316 tcp_teardown();
317
318 fprintf(stderr, "PASS\n");
319 return (0);
320 }
321