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 * 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); 66 ATF_TC_HEAD(link_count, tc) 67 { 68 atf_tc_set_md_var(tc, "descr", "link(2) counts are incremented?"); 69 } 70 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 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); 104 ATF_TC_HEAD(link_err, tc) 105 { 106 atf_tc_set_md_var(tc, "descr", "Test error conditions of link(2)"); 107 } 108 109 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 } 148 149 ATF_TC_CLEANUP(link_err, tc) 150 { 151 (void)unlink(path); 152 (void)unlink(pathl); 153 } 154 155 ATF_TC(link_perm); 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 } 161 162 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); 178 ATF_TC_HEAD(link_stat, tc) 179 { 180 atf_tc_set_md_var(tc, "descr", "Check stat(2) of a linked file"); 181 } 182 183 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 } 214 215 ATF_TC_CLEANUP(link_stat, tc) 216 { 217 (void)unlink(path); 218 (void)unlink(pathl); 219 } 220 221 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