tests/lib/libc/sys/t_link.c

   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 *
  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);
  65 ATF_TC_HEAD(link_count, tc)
  66 {
  67         atf_tc_set_md_var(tc, "descr", "link(2) counts are incremented?");
  68 }
  69
  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
  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);
 103 ATF_TC_HEAD(link_err, tc)
 104 {
 105         atf_tc_set_md_var(tc, "descr", "Test error conditions of link(2)");
 106 }
 107
 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
 148 ATF_TC_CLEANUP(link_err, tc)
 149 {
 150         (void)unlink(path);
 151         (void)unlink(pathl);
 152 }
 153
 154 ATF_TC(link_perm);
 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
 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);
 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
 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
 214 ATF_TC_CLEANUP(link_stat, tc)
 215 {
 216         (void)unlink(path);
 217         (void)unlink(pathl);
 218 }
 219
 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 }