1 /* $NetBSD: t_link.c,v 1.3 2017/01/13 20:42:36 christos 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 1.3 2017/01/13 20:42:36 christos 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 <limits.h>
41 #include <stdio.h>
42 #include <string.h>
43 #include <unistd.h>
44
45 static const char *getpath(void);
46 static char path[] = "link";
47 static const char *pathl;
48
49 static const char *
getpath(void)50 getpath(void)
51 {
52 static char buf[LINE_MAX];
53
54 (void)memset(buf, '\0', sizeof(buf));
55
56 if (getcwd(buf, sizeof(buf)) == NULL)
57 return NULL;
58
59 (void)strlcat(buf, path, sizeof(buf));
60 (void)strlcat(buf, ".link", sizeof(buf));
61
62 return buf;
63 }
64
65 ATF_TC_WITH_CLEANUP(link_count);
ATF_TC_HEAD(link_count,tc)66 ATF_TC_HEAD(link_count, tc)
67 {
68 atf_tc_set_md_var(tc, "descr", "link(2) counts are incremented?");
69 }
70
ATF_TC_BODY(link_count,tc)71 ATF_TC_BODY(link_count, tc)
72 {
73 struct stat sa, sb;
74 int fd;
75
76 (void)memset(&sa, 0, sizeof(struct stat));
77 (void)memset(&sb, 0, sizeof(struct stat));
78
79 pathl = getpath();
80 fd = open(path, O_RDWR | O_CREAT, 0600);
81
82 ATF_REQUIRE(fd >= 0);
83 ATF_REQUIRE(pathl != NULL);
84
85 ATF_REQUIRE(stat(path, &sa) == 0);
86 ATF_REQUIRE(link(path, pathl) == 0);
87 ATF_REQUIRE(stat(path, &sb) == 0);
88
89 if (sa.st_nlink != sb.st_nlink - 1)
90 atf_tc_fail("incorrect link(2) count");
91
92 ATF_REQUIRE(close(fd) == 0);
93 ATF_REQUIRE(unlink(path) == 0);
94 ATF_REQUIRE(unlink(pathl) == 0);
95 }
96
ATF_TC_CLEANUP(link_count,tc)97 ATF_TC_CLEANUP(link_count, tc)
98 {
99 (void)unlink(path);
100 (void)unlink(pathl);
101 }
102
103 ATF_TC_WITH_CLEANUP(link_err);
ATF_TC_HEAD(link_err,tc)104 ATF_TC_HEAD(link_err, tc)
105 {
106 atf_tc_set_md_var(tc, "descr", "Test error conditions of link(2)");
107 }
108
ATF_TC_BODY(link_err,tc)109 ATF_TC_BODY(link_err, tc)
110 {
111 char buf[MAXPATHLEN + 1];
112 int fd;
113
114 (void)memset(buf, 'x', sizeof(buf));
115
116 pathl = getpath();
117 fd = open(path, O_RDWR | O_CREAT, 0600);
118
119 ATF_REQUIRE(fd >= 0);
120 ATF_REQUIRE(pathl != NULL);
121
122 errno = 0;
123 ATF_REQUIRE(link(path, pathl) == 0);
124 ATF_REQUIRE_ERRNO(EEXIST, link(path, pathl) == -1);
125
126 errno = 0;
127 ATF_REQUIRE_ERRNO(ENAMETOOLONG, link(buf, "xxx") == -1);
128
129 errno = 0;
130 ATF_REQUIRE_ERRNO(ENOENT, link(path, "/d/c/b/a") == -1);
131
132 errno = 0;
133 ATF_REQUIRE_ERRNO(ENOENT, link("/a/b/c/d", path) == -1);
134
135 errno = 0;
136 ATF_REQUIRE_ERRNO(ENOENT, link("/a/b/c/d", "/d/c/b/a") == -1);
137
138 errno = 0;
139 ATF_REQUIRE_ERRNO(EFAULT, link(path, (const char *)-1) == -1);
140
141 errno = 0;
142 ATF_REQUIRE_ERRNO(EFAULT, link((const char *)-1, "xxx") == -1);
143
144 ATF_REQUIRE(close(fd) == 0);
145 ATF_REQUIRE(unlink(path) == 0);
146 ATF_REQUIRE(unlink(pathl) == 0);
147 }
148
ATF_TC_CLEANUP(link_err,tc)149 ATF_TC_CLEANUP(link_err, tc)
150 {
151 (void)unlink(path);
152 (void)unlink(pathl);
153 }
154
155 ATF_TC(link_perm);
ATF_TC_HEAD(link_perm,tc)156 ATF_TC_HEAD(link_perm, tc)
157 {
158 atf_tc_set_md_var(tc, "descr", "Test permissions with link(2)");
159 atf_tc_set_md_var(tc, "require.user", "unprivileged");
160 }
161
ATF_TC_BODY(link_perm,tc)162 ATF_TC_BODY(link_perm, tc)
163 {
164 int rv;
165
166 errno = 0;
167 rv = link("/root", "/root.link");
168 ATF_REQUIRE_MSG(rv == -1 && (errno == EACCES || errno == EPERM),
169 "link to a directory did not fail with EPERM or EACCESS; link() "
170 "returned %d, errno %d", rv, errno);
171
172 errno = 0;
173 ATF_REQUIRE_ERRNO(EACCES,
174 link("/root/.profile", "/root/.profile.link") == -1);
175 }
176
177 ATF_TC_WITH_CLEANUP(link_stat);
ATF_TC_HEAD(link_stat,tc)178 ATF_TC_HEAD(link_stat, tc)
179 {
180 atf_tc_set_md_var(tc, "descr", "Check stat(2) of a linked file");
181 }
182
ATF_TC_BODY(link_stat,tc)183 ATF_TC_BODY(link_stat, tc)
184 {
185 struct stat sa, sb;
186 int fd;
187
188 (void)memset(&sa, 0, sizeof(struct stat));
189 (void)memset(&sb, 0, sizeof(struct stat));
190
191 pathl = getpath();
192 fd = open(path, O_RDWR | O_CREAT, 0600);
193
194 ATF_REQUIRE(fd >= 0);
195 ATF_REQUIRE(pathl != NULL);
196
197 ATF_REQUIRE(link(path, pathl) == 0);
198 ATF_REQUIRE(stat(path, &sa) == 0);
199 ATF_REQUIRE(lstat(pathl, &sb) == 0);
200
201 if (sa.st_uid != sb.st_uid)
202 atf_tc_fail("unequal UIDs");
203
204 if (sa.st_mode != sb.st_mode)
205 atf_tc_fail("unequal modes");
206
207 if (sa.st_ino != sb.st_ino)
208 atf_tc_fail("unequal inodes");
209
210 ATF_REQUIRE(close(fd) == 0);
211 ATF_REQUIRE(unlink(path) == 0);
212 ATF_REQUIRE(unlink(pathl) == 0);
213 }
214
ATF_TC_CLEANUP(link_stat,tc)215 ATF_TC_CLEANUP(link_stat, tc)
216 {
217 (void)unlink(path);
218 (void)unlink(pathl);
219 }
220
ATF_TP_ADD_TCS(tp)221 ATF_TP_ADD_TCS(tp)
222 {
223
224 ATF_TP_ADD_TC(tp, link_count);
225 ATF_TP_ADD_TC(tp, link_err);
226 ATF_TP_ADD_TC(tp, link_perm);
227 ATF_TP_ADD_TC(tp, link_stat);
228
229 return atf_no_error();
230 }
231