1 /*
2 * Copyright (c) 2017 Dell EMC Isilon
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/param.h>
28 #include <errno.h>
29 #include <fcntl.h>
30 #include <glob.h>
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <string.h>
34 #include <time.h>
35 #include <unistd.h>
36
37 #include <atf-c.h>
38
39 /*
40 * Derived from Russ Cox' pathological case test program used for the
41 * https://research.swtch.com/glob article.
42 */
43 ATF_TC_WITHOUT_HEAD(glob_pathological_test);
ATF_TC_BODY(glob_pathological_test,tc)44 ATF_TC_BODY(glob_pathological_test, tc)
45 {
46 struct timespec t, t2;
47 glob_t g;
48 const char *longname = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
49 "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
50 char pattern[1000], *p;
51 double dt;
52 unsigned i, j, k, mul;
53 int fd, rc;
54
55 fd = open(longname, O_CREAT | O_RDWR, 0666);
56 ATF_REQUIRE(fd >= 0);
57
58 /*
59 * Test up to 100 a* groups. Exponential implementations typically go
60 * bang at i=7 or 8.
61 */
62 for (i = 0; i < 100; i++) {
63 /*
64 * Create a*...b pattern with i 'a*' groups.
65 */
66 p = pattern;
67 for (k = 0; k < i; k++) {
68 *p++ = 'a';
69 *p++ = '*';
70 }
71 *p++ = 'b';
72 *p = '\0';
73
74 clock_gettime(CLOCK_REALTIME, &t);
75 for (j = 0; j < mul; j++) {
76 memset(&g, 0, sizeof g);
77 rc = glob(pattern, 0, 0, &g);
78 if (rc == GLOB_NOSPACE || rc == GLOB_ABORTED) {
79 ATF_REQUIRE_MSG(rc == GLOB_NOMATCH,
80 "an unexpected error occurred: "
81 "rc=%d errno=%d", rc, errno);
82 /* NORETURN */
83 }
84
85 ATF_CHECK_MSG(rc == GLOB_NOMATCH,
86 "A bogus match occurred: '%s' ~ '%s'", pattern,
87 g.gl_pathv[0]);
88 globfree(&g);
89 }
90 clock_gettime(CLOCK_REALTIME, &t2);
91
92 t2.tv_sec -= t.tv_sec;
93 t2.tv_nsec -= t.tv_nsec;
94 dt = t2.tv_sec + (double)t2.tv_nsec/1e9;
95 dt /= mul;
96
97 ATF_CHECK_MSG(dt < 1, "glob(3) took far too long: %d %.9f", i,
98 dt);
99
100 if (dt >= 0.0001)
101 mul = 1;
102 }
103 }
104
ATF_TP_ADD_TCS(tp)105 ATF_TP_ADD_TCS(tp)
106 {
107
108 ATF_TP_ADD_TC(tp, glob_pathological_test);
109
110 return (atf_no_error());
111 }
112