1 /* $NetBSD: t_link.c,v 1.2 2014/04/21 14:39:36 martin Exp $ */
2
3 /*-
4 * Copyright (c) 2011 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jukka Ruohonen.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31 #include <sys/cdefs.h>
32 __RCSID("$NetBSD: t_link.c,v 1.2 2014/04/21 14:39:36 martin Exp $");
33
34 #include <sys/param.h>
35 #include <sys/stat.h>
36
37 #include <atf-c.h>
38 #include <errno.h>
39 #include <fcntl.h>
40 #include <stdio.h>
41 #include <string.h>
42 #include <unistd.h>
43
44 static const char *getpath(void);
45 static char path[] = "link";
46 static const char *pathl;
47
48 static const char *
getpath(void)49 getpath(void)
50 {
51 static char buf[LINE_MAX];
52
53 (void)memset(buf, '\0', sizeof(buf));
54
55 if (getcwd(buf, sizeof(buf)) == NULL)
56 return NULL;
57
58 (void)strlcat(buf, path, sizeof(buf));
59 (void)strlcat(buf, ".link", sizeof(buf));
60
61 return buf;
62 }
63
64 ATF_TC_WITH_CLEANUP(link_count);
ATF_TC_HEAD(link_count,tc)65 ATF_TC_HEAD(link_count, tc)
66 {
67 atf_tc_set_md_var(tc, "descr", "link(2) counts are incremented?");
68 }
69
ATF_TC_BODY(link_count,tc)70 ATF_TC_BODY(link_count, tc)
71 {
72 struct stat sa, sb;
73 int fd;
74
75 (void)memset(&sa, 0, sizeof(struct stat));
76 (void)memset(&sb, 0, sizeof(struct stat));
77
78 pathl = getpath();
79 fd = open(path, O_RDWR | O_CREAT, 0600);
80
81 ATF_REQUIRE(fd >= 0);
82 ATF_REQUIRE(pathl != NULL);
83
84 ATF_REQUIRE(stat(path, &sa) == 0);
85 ATF_REQUIRE(link(path, pathl) == 0);
86 ATF_REQUIRE(stat(path, &sb) == 0);
87
88 if (sa.st_nlink != sb.st_nlink - 1)
89 atf_tc_fail("incorrect link(2) count");
90
91 ATF_REQUIRE(close(fd) == 0);
92 ATF_REQUIRE(unlink(path) == 0);
93 ATF_REQUIRE(unlink(pathl) == 0);
94 }
95
ATF_TC_CLEANUP(link_count,tc)96 ATF_TC_CLEANUP(link_count, tc)
97 {
98 (void)unlink(path);
99 (void)unlink(pathl);
100 }
101
102 ATF_TC_WITH_CLEANUP(link_err);
ATF_TC_HEAD(link_err,tc)103 ATF_TC_HEAD(link_err, tc)
104 {
105 atf_tc_set_md_var(tc, "descr", "Test error conditions of link(2)");
106 }
107
ATF_TC_BODY(link_err,tc)108 ATF_TC_BODY(link_err, tc)
109 {
110 char buf[MAXPATHLEN + 1];
111 int fd;
112
113 (void)memset(buf, 'x', sizeof(buf));
114
115 pathl = getpath();
116 fd = open(path, O_RDWR | O_CREAT, 0600);
117
118 ATF_REQUIRE(fd >= 0);
119 ATF_REQUIRE(pathl != NULL);
120
121 errno = 0;
122 ATF_REQUIRE(link(path, pathl) == 0);
123 ATF_REQUIRE_ERRNO(EEXIST, link(path, pathl) == -1);
124
125 errno = 0;
126 ATF_REQUIRE_ERRNO(ENAMETOOLONG, link(buf, "xxx") == -1);
127
128 errno = 0;
129 ATF_REQUIRE_ERRNO(ENOENT, link(path, "/d/c/b/a") == -1);
130
131 errno = 0;
132 ATF_REQUIRE_ERRNO(ENOENT, link("/a/b/c/d", path) == -1);
133
134 errno = 0;
135 ATF_REQUIRE_ERRNO(ENOENT, link("/a/b/c/d", "/d/c/b/a") == -1);
136
137 errno = 0;
138 ATF_REQUIRE_ERRNO(EFAULT, link(path, (const char *)-1) == -1);
139
140 errno = 0;
141 ATF_REQUIRE_ERRNO(EFAULT, link((const char *)-1, "xxx") == -1);
142
143 ATF_REQUIRE(close(fd) == 0);
144 ATF_REQUIRE(unlink(path) == 0);
145 ATF_REQUIRE(unlink(pathl) == 0);
146 }
147
ATF_TC_CLEANUP(link_err,tc)148 ATF_TC_CLEANUP(link_err, tc)
149 {
150 (void)unlink(path);
151 (void)unlink(pathl);
152 }
153
154 ATF_TC(link_perm);
ATF_TC_HEAD(link_perm,tc)155 ATF_TC_HEAD(link_perm, tc)
156 {
157 atf_tc_set_md_var(tc, "descr", "Test permissions with link(2)");
158 atf_tc_set_md_var(tc, "require.user", "unprivileged");
159 }
160
ATF_TC_BODY(link_perm,tc)161 ATF_TC_BODY(link_perm, tc)
162 {
163 int rv;
164
165 errno = 0;
166 rv = link("/root", "/root.link");
167 ATF_REQUIRE_MSG(rv == -1 && (errno == EACCES || errno == EPERM),
168 "link to a directory did not fail with EPERM or EACCESS; link() "
169 "returned %d, errno %d", rv, errno);
170
171 errno = 0;
172 ATF_REQUIRE_ERRNO(EACCES,
173 link("/root/.profile", "/root/.profile.link") == -1);
174 }
175
176 ATF_TC_WITH_CLEANUP(link_stat);
ATF_TC_HEAD(link_stat,tc)177 ATF_TC_HEAD(link_stat, tc)
178 {
179 atf_tc_set_md_var(tc, "descr", "Check stat(2) of a linked file");
180 }
181
ATF_TC_BODY(link_stat,tc)182 ATF_TC_BODY(link_stat, tc)
183 {
184 struct stat sa, sb;
185 int fd;
186
187 (void)memset(&sa, 0, sizeof(struct stat));
188 (void)memset(&sb, 0, sizeof(struct stat));
189
190 pathl = getpath();
191 fd = open(path, O_RDWR | O_CREAT, 0600);
192
193 ATF_REQUIRE(fd >= 0);
194 ATF_REQUIRE(pathl != NULL);
195
196 ATF_REQUIRE(link(path, pathl) == 0);
197 ATF_REQUIRE(stat(path, &sa) == 0);
198 ATF_REQUIRE(lstat(pathl, &sb) == 0);
199
200 if (sa.st_uid != sb.st_uid)
201 atf_tc_fail("unequal UIDs");
202
203 if (sa.st_mode != sb.st_mode)
204 atf_tc_fail("unequal modes");
205
206 if (sa.st_ino != sb.st_ino)
207 atf_tc_fail("unequal inodes");
208
209 ATF_REQUIRE(close(fd) == 0);
210 ATF_REQUIRE(unlink(path) == 0);
211 ATF_REQUIRE(unlink(pathl) == 0);
212 }
213
ATF_TC_CLEANUP(link_stat,tc)214 ATF_TC_CLEANUP(link_stat, tc)
215 {
216 (void)unlink(path);
217 (void)unlink(pathl);
218 }
219
ATF_TP_ADD_TCS(tp)220 ATF_TP_ADD_TCS(tp)
221 {
222
223 ATF_TP_ADD_TC(tp, link_count);
224 ATF_TP_ADD_TC(tp, link_err);
225 ATF_TP_ADD_TC(tp, link_perm);
226 ATF_TP_ADD_TC(tp, link_stat);
227
228 return atf_no_error();
229 }
230