1*86d82e08Schristos /* $NetBSD: t_link.c,v 1.3 2017/01/13 20:42:36 christos Exp $ */
2068fb4f1Sjruoho
3068fb4f1Sjruoho /*-
4068fb4f1Sjruoho * Copyright (c) 2011 The NetBSD Foundation, Inc.
5068fb4f1Sjruoho * All rights reserved.
6068fb4f1Sjruoho *
7068fb4f1Sjruoho * This code is derived from software contributed to The NetBSD Foundation
8068fb4f1Sjruoho * by Jukka Ruohonen.
9068fb4f1Sjruoho *
10068fb4f1Sjruoho * Redistribution and use in source and binary forms, with or without
11068fb4f1Sjruoho * modification, are permitted provided that the following conditions
12068fb4f1Sjruoho * are met:
13068fb4f1Sjruoho * 1. Redistributions of source code must retain the above copyright
14068fb4f1Sjruoho * notice, this list of conditions and the following disclaimer.
15068fb4f1Sjruoho * 2. Redistributions in binary form must reproduce the above copyright
16068fb4f1Sjruoho * notice, this list of conditions and the following disclaimer in the
17068fb4f1Sjruoho * documentation and/or other materials provided with the distribution.
18068fb4f1Sjruoho *
19068fb4f1Sjruoho * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20068fb4f1Sjruoho * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21068fb4f1Sjruoho * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22068fb4f1Sjruoho * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23068fb4f1Sjruoho * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24068fb4f1Sjruoho * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25068fb4f1Sjruoho * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26068fb4f1Sjruoho * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27068fb4f1Sjruoho * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28068fb4f1Sjruoho * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29068fb4f1Sjruoho * POSSIBILITY OF SUCH DAMAGE.
30068fb4f1Sjruoho */
31068fb4f1Sjruoho #include <sys/cdefs.h>
32*86d82e08Schristos __RCSID("$NetBSD: t_link.c,v 1.3 2017/01/13 20:42:36 christos Exp $");
33068fb4f1Sjruoho
34068fb4f1Sjruoho #include <sys/param.h>
35068fb4f1Sjruoho #include <sys/stat.h>
36068fb4f1Sjruoho
37068fb4f1Sjruoho #include <atf-c.h>
38068fb4f1Sjruoho #include <errno.h>
39068fb4f1Sjruoho #include <fcntl.h>
40*86d82e08Schristos #include <limits.h>
41068fb4f1Sjruoho #include <stdio.h>
42068fb4f1Sjruoho #include <string.h>
43068fb4f1Sjruoho #include <unistd.h>
44068fb4f1Sjruoho
45068fb4f1Sjruoho static const char *getpath(void);
46068fb4f1Sjruoho static char path[] = "link";
47068fb4f1Sjruoho static const char *pathl;
48068fb4f1Sjruoho
49068fb4f1Sjruoho static const char *
getpath(void)50068fb4f1Sjruoho getpath(void)
51068fb4f1Sjruoho {
52068fb4f1Sjruoho static char buf[LINE_MAX];
53068fb4f1Sjruoho
54068fb4f1Sjruoho (void)memset(buf, '\0', sizeof(buf));
55068fb4f1Sjruoho
56068fb4f1Sjruoho if (getcwd(buf, sizeof(buf)) == NULL)
57068fb4f1Sjruoho return NULL;
58068fb4f1Sjruoho
59068fb4f1Sjruoho (void)strlcat(buf, path, sizeof(buf));
60068fb4f1Sjruoho (void)strlcat(buf, ".link", sizeof(buf));
61068fb4f1Sjruoho
62068fb4f1Sjruoho return buf;
63068fb4f1Sjruoho }
64068fb4f1Sjruoho
65068fb4f1Sjruoho ATF_TC_WITH_CLEANUP(link_count);
ATF_TC_HEAD(link_count,tc)66068fb4f1Sjruoho ATF_TC_HEAD(link_count, tc)
67068fb4f1Sjruoho {
68068fb4f1Sjruoho atf_tc_set_md_var(tc, "descr", "link(2) counts are incremented?");
69068fb4f1Sjruoho }
70068fb4f1Sjruoho
ATF_TC_BODY(link_count,tc)71068fb4f1Sjruoho ATF_TC_BODY(link_count, tc)
72068fb4f1Sjruoho {
73068fb4f1Sjruoho struct stat sa, sb;
74068fb4f1Sjruoho int fd;
75068fb4f1Sjruoho
76068fb4f1Sjruoho (void)memset(&sa, 0, sizeof(struct stat));
77068fb4f1Sjruoho (void)memset(&sb, 0, sizeof(struct stat));
78068fb4f1Sjruoho
79068fb4f1Sjruoho pathl = getpath();
80068fb4f1Sjruoho fd = open(path, O_RDWR | O_CREAT, 0600);
81068fb4f1Sjruoho
82068fb4f1Sjruoho ATF_REQUIRE(fd >= 0);
83068fb4f1Sjruoho ATF_REQUIRE(pathl != NULL);
84068fb4f1Sjruoho
85068fb4f1Sjruoho ATF_REQUIRE(stat(path, &sa) == 0);
86068fb4f1Sjruoho ATF_REQUIRE(link(path, pathl) == 0);
87068fb4f1Sjruoho ATF_REQUIRE(stat(path, &sb) == 0);
88068fb4f1Sjruoho
89068fb4f1Sjruoho if (sa.st_nlink != sb.st_nlink - 1)
90068fb4f1Sjruoho atf_tc_fail("incorrect link(2) count");
91068fb4f1Sjruoho
92068fb4f1Sjruoho ATF_REQUIRE(close(fd) == 0);
93068fb4f1Sjruoho ATF_REQUIRE(unlink(path) == 0);
94068fb4f1Sjruoho ATF_REQUIRE(unlink(pathl) == 0);
95068fb4f1Sjruoho }
96068fb4f1Sjruoho
ATF_TC_CLEANUP(link_count,tc)97068fb4f1Sjruoho ATF_TC_CLEANUP(link_count, tc)
98068fb4f1Sjruoho {
99068fb4f1Sjruoho (void)unlink(path);
100068fb4f1Sjruoho (void)unlink(pathl);
101068fb4f1Sjruoho }
102068fb4f1Sjruoho
103068fb4f1Sjruoho ATF_TC_WITH_CLEANUP(link_err);
ATF_TC_HEAD(link_err,tc)104068fb4f1Sjruoho ATF_TC_HEAD(link_err, tc)
105068fb4f1Sjruoho {
106068fb4f1Sjruoho atf_tc_set_md_var(tc, "descr", "Test error conditions of link(2)");
107068fb4f1Sjruoho }
108068fb4f1Sjruoho
ATF_TC_BODY(link_err,tc)109068fb4f1Sjruoho ATF_TC_BODY(link_err, tc)
110068fb4f1Sjruoho {
111068fb4f1Sjruoho char buf[MAXPATHLEN + 1];
112068fb4f1Sjruoho int fd;
113068fb4f1Sjruoho
114068fb4f1Sjruoho (void)memset(buf, 'x', sizeof(buf));
115068fb4f1Sjruoho
116068fb4f1Sjruoho pathl = getpath();
117068fb4f1Sjruoho fd = open(path, O_RDWR | O_CREAT, 0600);
118068fb4f1Sjruoho
119068fb4f1Sjruoho ATF_REQUIRE(fd >= 0);
120068fb4f1Sjruoho ATF_REQUIRE(pathl != NULL);
121068fb4f1Sjruoho
122068fb4f1Sjruoho errno = 0;
123068fb4f1Sjruoho ATF_REQUIRE(link(path, pathl) == 0);
124068fb4f1Sjruoho ATF_REQUIRE_ERRNO(EEXIST, link(path, pathl) == -1);
125068fb4f1Sjruoho
126068fb4f1Sjruoho errno = 0;
127068fb4f1Sjruoho ATF_REQUIRE_ERRNO(ENAMETOOLONG, link(buf, "xxx") == -1);
128068fb4f1Sjruoho
129068fb4f1Sjruoho errno = 0;
130068fb4f1Sjruoho ATF_REQUIRE_ERRNO(ENOENT, link(path, "/d/c/b/a") == -1);
131068fb4f1Sjruoho
132068fb4f1Sjruoho errno = 0;
133068fb4f1Sjruoho ATF_REQUIRE_ERRNO(ENOENT, link("/a/b/c/d", path) == -1);
134068fb4f1Sjruoho
135068fb4f1Sjruoho errno = 0;
136068fb4f1Sjruoho ATF_REQUIRE_ERRNO(ENOENT, link("/a/b/c/d", "/d/c/b/a") == -1);
137068fb4f1Sjruoho
138068fb4f1Sjruoho errno = 0;
139068fb4f1Sjruoho ATF_REQUIRE_ERRNO(EFAULT, link(path, (const char *)-1) == -1);
140068fb4f1Sjruoho
141068fb4f1Sjruoho errno = 0;
142068fb4f1Sjruoho ATF_REQUIRE_ERRNO(EFAULT, link((const char *)-1, "xxx") == -1);
143068fb4f1Sjruoho
144068fb4f1Sjruoho ATF_REQUIRE(close(fd) == 0);
145068fb4f1Sjruoho ATF_REQUIRE(unlink(path) == 0);
146068fb4f1Sjruoho ATF_REQUIRE(unlink(pathl) == 0);
147068fb4f1Sjruoho }
148068fb4f1Sjruoho
ATF_TC_CLEANUP(link_err,tc)149068fb4f1Sjruoho ATF_TC_CLEANUP(link_err, tc)
150068fb4f1Sjruoho {
151068fb4f1Sjruoho (void)unlink(path);
152068fb4f1Sjruoho (void)unlink(pathl);
153068fb4f1Sjruoho }
154068fb4f1Sjruoho
155068fb4f1Sjruoho ATF_TC(link_perm);
ATF_TC_HEAD(link_perm,tc)156068fb4f1Sjruoho ATF_TC_HEAD(link_perm, tc)
157068fb4f1Sjruoho {
158068fb4f1Sjruoho atf_tc_set_md_var(tc, "descr", "Test permissions with link(2)");
159068fb4f1Sjruoho atf_tc_set_md_var(tc, "require.user", "unprivileged");
160068fb4f1Sjruoho }
161068fb4f1Sjruoho
ATF_TC_BODY(link_perm,tc)162068fb4f1Sjruoho ATF_TC_BODY(link_perm, tc)
163068fb4f1Sjruoho {
164e3e7e2d0Smartin int rv;
165068fb4f1Sjruoho
166068fb4f1Sjruoho errno = 0;
167e3e7e2d0Smartin rv = link("/root", "/root.link");
168e3e7e2d0Smartin ATF_REQUIRE_MSG(rv == -1 && (errno == EACCES || errno == EPERM),
169e3e7e2d0Smartin "link to a directory did not fail with EPERM or EACCESS; link() "
170e3e7e2d0Smartin "returned %d, errno %d", rv, errno);
171068fb4f1Sjruoho
172068fb4f1Sjruoho errno = 0;
173068fb4f1Sjruoho ATF_REQUIRE_ERRNO(EACCES,
174068fb4f1Sjruoho link("/root/.profile", "/root/.profile.link") == -1);
175068fb4f1Sjruoho }
176068fb4f1Sjruoho
177068fb4f1Sjruoho ATF_TC_WITH_CLEANUP(link_stat);
ATF_TC_HEAD(link_stat,tc)178068fb4f1Sjruoho ATF_TC_HEAD(link_stat, tc)
179068fb4f1Sjruoho {
180068fb4f1Sjruoho atf_tc_set_md_var(tc, "descr", "Check stat(2) of a linked file");
181068fb4f1Sjruoho }
182068fb4f1Sjruoho
ATF_TC_BODY(link_stat,tc)183068fb4f1Sjruoho ATF_TC_BODY(link_stat, tc)
184068fb4f1Sjruoho {
185068fb4f1Sjruoho struct stat sa, sb;
186068fb4f1Sjruoho int fd;
187068fb4f1Sjruoho
188068fb4f1Sjruoho (void)memset(&sa, 0, sizeof(struct stat));
189068fb4f1Sjruoho (void)memset(&sb, 0, sizeof(struct stat));
190068fb4f1Sjruoho
191068fb4f1Sjruoho pathl = getpath();
192068fb4f1Sjruoho fd = open(path, O_RDWR | O_CREAT, 0600);
193068fb4f1Sjruoho
194068fb4f1Sjruoho ATF_REQUIRE(fd >= 0);
195068fb4f1Sjruoho ATF_REQUIRE(pathl != NULL);
196068fb4f1Sjruoho
197068fb4f1Sjruoho ATF_REQUIRE(link(path, pathl) == 0);
198068fb4f1Sjruoho ATF_REQUIRE(stat(path, &sa) == 0);
199068fb4f1Sjruoho ATF_REQUIRE(lstat(pathl, &sb) == 0);
200068fb4f1Sjruoho
201068fb4f1Sjruoho if (sa.st_uid != sb.st_uid)
202068fb4f1Sjruoho atf_tc_fail("unequal UIDs");
203068fb4f1Sjruoho
204068fb4f1Sjruoho if (sa.st_mode != sb.st_mode)
205068fb4f1Sjruoho atf_tc_fail("unequal modes");
206068fb4f1Sjruoho
207068fb4f1Sjruoho if (sa.st_ino != sb.st_ino)
208068fb4f1Sjruoho atf_tc_fail("unequal inodes");
209068fb4f1Sjruoho
210068fb4f1Sjruoho ATF_REQUIRE(close(fd) == 0);
211068fb4f1Sjruoho ATF_REQUIRE(unlink(path) == 0);
212068fb4f1Sjruoho ATF_REQUIRE(unlink(pathl) == 0);
213068fb4f1Sjruoho }
214068fb4f1Sjruoho
ATF_TC_CLEANUP(link_stat,tc)215068fb4f1Sjruoho ATF_TC_CLEANUP(link_stat, tc)
216068fb4f1Sjruoho {
217068fb4f1Sjruoho (void)unlink(path);
218068fb4f1Sjruoho (void)unlink(pathl);
219068fb4f1Sjruoho }
220068fb4f1Sjruoho
ATF_TP_ADD_TCS(tp)221068fb4f1Sjruoho ATF_TP_ADD_TCS(tp)
222068fb4f1Sjruoho {
223068fb4f1Sjruoho
224068fb4f1Sjruoho ATF_TP_ADD_TC(tp, link_count);
225068fb4f1Sjruoho ATF_TP_ADD_TC(tp, link_err);
226068fb4f1Sjruoho ATF_TP_ADD_TC(tp, link_perm);
227068fb4f1Sjruoho ATF_TP_ADD_TC(tp, link_stat);
228068fb4f1Sjruoho
229068fb4f1Sjruoho return atf_no_error();
230068fb4f1Sjruoho }
231