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 #ifdef __FreeBSD__ 46 #include <limits.h> 47 #endif 48 49 static const char *getpath(void); 50 static char path[] = "link"; 51 static const char *pathl; 52 53 static const char * 54 getpath(void) 55 { 56 static char buf[LINE_MAX]; 57 58 (void)memset(buf, '\0', sizeof(buf)); 59 60 if (getcwd(buf, sizeof(buf)) == NULL) 61 return NULL; 62 63 (void)strlcat(buf, path, sizeof(buf)); 64 (void)strlcat(buf, ".link", sizeof(buf)); 65 66 return buf; 67 } 68 69 ATF_TC_WITH_CLEANUP(link_count); 70 ATF_TC_HEAD(link_count, tc) 71 { 72 atf_tc_set_md_var(tc, "descr", "link(2) counts are incremented?"); 73 } 74 75 ATF_TC_BODY(link_count, tc) 76 { 77 struct stat sa, sb; 78 int fd; 79 80 (void)memset(&sa, 0, sizeof(struct stat)); 81 (void)memset(&sb, 0, sizeof(struct stat)); 82 83 pathl = getpath(); 84 fd = open(path, O_RDWR | O_CREAT, 0600); 85 86 ATF_REQUIRE(fd >= 0); 87 ATF_REQUIRE(pathl != NULL); 88 89 ATF_REQUIRE(stat(path, &sa) == 0); 90 ATF_REQUIRE(link(path, pathl) == 0); 91 ATF_REQUIRE(stat(path, &sb) == 0); 92 93 if (sa.st_nlink != sb.st_nlink - 1) 94 atf_tc_fail("incorrect link(2) count"); 95 96 ATF_REQUIRE(close(fd) == 0); 97 ATF_REQUIRE(unlink(path) == 0); 98 ATF_REQUIRE(unlink(pathl) == 0); 99 } 100 101 ATF_TC_CLEANUP(link_count, tc) 102 { 103 (void)unlink(path); 104 (void)unlink(pathl); 105 } 106 107 ATF_TC_WITH_CLEANUP(link_err); 108 ATF_TC_HEAD(link_err, tc) 109 { 110 atf_tc_set_md_var(tc, "descr", "Test error conditions of link(2)"); 111 } 112 113 ATF_TC_BODY(link_err, tc) 114 { 115 char buf[MAXPATHLEN + 1]; 116 int fd; 117 118 (void)memset(buf, 'x', sizeof(buf)); 119 120 pathl = getpath(); 121 fd = open(path, O_RDWR | O_CREAT, 0600); 122 123 ATF_REQUIRE(fd >= 0); 124 ATF_REQUIRE(pathl != NULL); 125 126 errno = 0; 127 ATF_REQUIRE(link(path, pathl) == 0); 128 ATF_REQUIRE_ERRNO(EEXIST, link(path, pathl) == -1); 129 130 errno = 0; 131 ATF_REQUIRE_ERRNO(ENAMETOOLONG, link(buf, "xxx") == -1); 132 133 errno = 0; 134 ATF_REQUIRE_ERRNO(ENOENT, link(path, "/d/c/b/a") == -1); 135 136 errno = 0; 137 ATF_REQUIRE_ERRNO(ENOENT, link("/a/b/c/d", path) == -1); 138 139 errno = 0; 140 ATF_REQUIRE_ERRNO(ENOENT, link("/a/b/c/d", "/d/c/b/a") == -1); 141 142 errno = 0; 143 ATF_REQUIRE_ERRNO(EFAULT, link(path, (const char *)-1) == -1); 144 145 errno = 0; 146 ATF_REQUIRE_ERRNO(EFAULT, link((const char *)-1, "xxx") == -1); 147 148 ATF_REQUIRE(close(fd) == 0); 149 ATF_REQUIRE(unlink(path) == 0); 150 ATF_REQUIRE(unlink(pathl) == 0); 151 } 152 153 ATF_TC_CLEANUP(link_err, tc) 154 { 155 (void)unlink(path); 156 (void)unlink(pathl); 157 } 158 159 ATF_TC(link_perm); 160 ATF_TC_HEAD(link_perm, tc) 161 { 162 atf_tc_set_md_var(tc, "descr", "Test permissions with link(2)"); 163 atf_tc_set_md_var(tc, "require.user", "unprivileged"); 164 } 165 166 ATF_TC_BODY(link_perm, tc) 167 { 168 int rv; 169 170 errno = 0; 171 rv = link("/root", "/root.link"); 172 ATF_REQUIRE_MSG(rv == -1 && (errno == EACCES || errno == EPERM), 173 "link to a directory did not fail with EPERM or EACCESS; link() " 174 "returned %d, errno %d", rv, errno); 175 176 errno = 0; 177 ATF_REQUIRE_ERRNO(EACCES, 178 link("/root/.profile", "/root/.profile.link") == -1); 179 } 180 181 ATF_TC_WITH_CLEANUP(link_stat); 182 ATF_TC_HEAD(link_stat, tc) 183 { 184 atf_tc_set_md_var(tc, "descr", "Check stat(2) of a linked file"); 185 } 186 187 ATF_TC_BODY(link_stat, tc) 188 { 189 struct stat sa, sb; 190 int fd; 191 192 (void)memset(&sa, 0, sizeof(struct stat)); 193 (void)memset(&sb, 0, sizeof(struct stat)); 194 195 pathl = getpath(); 196 fd = open(path, O_RDWR | O_CREAT, 0600); 197 198 ATF_REQUIRE(fd >= 0); 199 ATF_REQUIRE(pathl != NULL); 200 201 ATF_REQUIRE(link(path, pathl) == 0); 202 ATF_REQUIRE(stat(path, &sa) == 0); 203 ATF_REQUIRE(lstat(pathl, &sb) == 0); 204 205 if (sa.st_uid != sb.st_uid) 206 atf_tc_fail("unequal UIDs"); 207 208 if (sa.st_mode != sb.st_mode) 209 atf_tc_fail("unequal modes"); 210 211 if (sa.st_ino != sb.st_ino) 212 atf_tc_fail("unequal inodes"); 213 214 ATF_REQUIRE(close(fd) == 0); 215 ATF_REQUIRE(unlink(path) == 0); 216 ATF_REQUIRE(unlink(pathl) == 0); 217 } 218 219 ATF_TC_CLEANUP(link_stat, tc) 220 { 221 (void)unlink(path); 222 (void)unlink(pathl); 223 } 224 225 ATF_TP_ADD_TCS(tp) 226 { 227 228 ATF_TP_ADD_TC(tp, link_count); 229 ATF_TP_ADD_TC(tp, link_err); 230 ATF_TP_ADD_TC(tp, link_perm); 231 ATF_TP_ADD_TC(tp, link_stat); 232 233 return atf_no_error(); 234 } 235