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 #ifdef __FreeBSD__ 45 #include <limits.h> 46 #endif 47 48 static const char *getpath(void); 49 static char path[] = "link"; 50 static const char *pathl; 51 52 static const char * 53 getpath(void) 54 { 55 static char buf[LINE_MAX]; 56 57 (void)memset(buf, '\0', sizeof(buf)); 58 59 if (getcwd(buf, sizeof(buf)) == NULL) 60 return NULL; 61 62 (void)strlcat(buf, path, sizeof(buf)); 63 (void)strlcat(buf, ".link", sizeof(buf)); 64 65 return buf; 66 } 67 68 ATF_TC_WITH_CLEANUP(link_count); 69 ATF_TC_HEAD(link_count, tc) 70 { 71 atf_tc_set_md_var(tc, "descr", "link(2) counts are incremented?"); 72 } 73 74 ATF_TC_BODY(link_count, tc) 75 { 76 struct stat sa, sb; 77 int fd; 78 79 (void)memset(&sa, 0, sizeof(struct stat)); 80 (void)memset(&sb, 0, sizeof(struct stat)); 81 82 pathl = getpath(); 83 fd = open(path, O_RDWR | O_CREAT, 0600); 84 85 ATF_REQUIRE(fd >= 0); 86 ATF_REQUIRE(pathl != NULL); 87 88 ATF_REQUIRE(stat(path, &sa) == 0); 89 ATF_REQUIRE(link(path, pathl) == 0); 90 ATF_REQUIRE(stat(path, &sb) == 0); 91 92 if (sa.st_nlink != sb.st_nlink - 1) 93 atf_tc_fail("incorrect link(2) count"); 94 95 ATF_REQUIRE(close(fd) == 0); 96 ATF_REQUIRE(unlink(path) == 0); 97 ATF_REQUIRE(unlink(pathl) == 0); 98 } 99 100 ATF_TC_CLEANUP(link_count, tc) 101 { 102 (void)unlink(path); 103 (void)unlink(pathl); 104 } 105 106 ATF_TC_WITH_CLEANUP(link_err); 107 ATF_TC_HEAD(link_err, tc) 108 { 109 atf_tc_set_md_var(tc, "descr", "Test error conditions of link(2)"); 110 } 111 112 ATF_TC_BODY(link_err, tc) 113 { 114 char buf[MAXPATHLEN + 1]; 115 int fd; 116 117 (void)memset(buf, 'x', sizeof(buf)); 118 119 pathl = getpath(); 120 fd = open(path, O_RDWR | O_CREAT, 0600); 121 122 ATF_REQUIRE(fd >= 0); 123 ATF_REQUIRE(pathl != NULL); 124 125 errno = 0; 126 ATF_REQUIRE(link(path, pathl) == 0); 127 ATF_REQUIRE_ERRNO(EEXIST, link(path, pathl) == -1); 128 129 errno = 0; 130 ATF_REQUIRE_ERRNO(ENAMETOOLONG, link(buf, "xxx") == -1); 131 132 errno = 0; 133 ATF_REQUIRE_ERRNO(ENOENT, link(path, "/d/c/b/a") == -1); 134 135 errno = 0; 136 ATF_REQUIRE_ERRNO(ENOENT, link("/a/b/c/d", path) == -1); 137 138 errno = 0; 139 ATF_REQUIRE_ERRNO(ENOENT, link("/a/b/c/d", "/d/c/b/a") == -1); 140 141 errno = 0; 142 ATF_REQUIRE_ERRNO(EFAULT, link(path, (const char *)-1) == -1); 143 144 errno = 0; 145 ATF_REQUIRE_ERRNO(EFAULT, link((const char *)-1, "xxx") == -1); 146 147 ATF_REQUIRE(close(fd) == 0); 148 ATF_REQUIRE(unlink(path) == 0); 149 ATF_REQUIRE(unlink(pathl) == 0); 150 } 151 152 ATF_TC_CLEANUP(link_err, tc) 153 { 154 (void)unlink(path); 155 (void)unlink(pathl); 156 } 157 158 ATF_TC(link_perm); 159 ATF_TC_HEAD(link_perm, tc) 160 { 161 atf_tc_set_md_var(tc, "descr", "Test permissions with link(2)"); 162 atf_tc_set_md_var(tc, "require.user", "unprivileged"); 163 } 164 165 ATF_TC_BODY(link_perm, tc) 166 { 167 int rv; 168 169 errno = 0; 170 rv = link("/root", "/root.link"); 171 ATF_REQUIRE_MSG(rv == -1 && (errno == EACCES || errno == EPERM), 172 "link to a directory did not fail with EPERM or EACCESS; link() " 173 "returned %d, errno %d", rv, errno); 174 175 errno = 0; 176 ATF_REQUIRE_ERRNO(EACCES, 177 link("/root/.profile", "/root/.profile.link") == -1); 178 } 179 180 ATF_TC_WITH_CLEANUP(link_stat); 181 ATF_TC_HEAD(link_stat, tc) 182 { 183 atf_tc_set_md_var(tc, "descr", "Check stat(2) of a linked file"); 184 } 185 186 ATF_TC_BODY(link_stat, tc) 187 { 188 struct stat sa, sb; 189 int fd; 190 191 (void)memset(&sa, 0, sizeof(struct stat)); 192 (void)memset(&sb, 0, sizeof(struct stat)); 193 194 pathl = getpath(); 195 fd = open(path, O_RDWR | O_CREAT, 0600); 196 197 ATF_REQUIRE(fd >= 0); 198 ATF_REQUIRE(pathl != NULL); 199 200 ATF_REQUIRE(link(path, pathl) == 0); 201 ATF_REQUIRE(stat(path, &sa) == 0); 202 ATF_REQUIRE(lstat(pathl, &sb) == 0); 203 204 if (sa.st_uid != sb.st_uid) 205 atf_tc_fail("unequal UIDs"); 206 207 if (sa.st_mode != sb.st_mode) 208 atf_tc_fail("unequal modes"); 209 210 if (sa.st_ino != sb.st_ino) 211 atf_tc_fail("unequal inodes"); 212 213 ATF_REQUIRE(close(fd) == 0); 214 ATF_REQUIRE(unlink(path) == 0); 215 ATF_REQUIRE(unlink(pathl) == 0); 216 } 217 218 ATF_TC_CLEANUP(link_stat, tc) 219 { 220 (void)unlink(path); 221 (void)unlink(pathl); 222 } 223 224 ATF_TP_ADD_TCS(tp) 225 { 226 227 ATF_TP_ADD_TC(tp, link_count); 228 ATF_TP_ADD_TC(tp, link_err); 229 ATF_TP_ADD_TC(tp, link_perm); 230 ATF_TP_ADD_TC(tp, link_stat); 231 232 return atf_no_error(); 233 } 234