t_dup.c revision 1.8
1/* $NetBSD: t_dup.c,v 1.8 2012/03/18 07:00:51 jruoho 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_dup.c,v 1.8 2012/03/18 07:00:51 jruoho Exp $"); 33 34#include <sys/resource.h> 35#include <sys/stat.h> 36#include <sys/wait.h> 37 38#include <atf-c.h> 39#include <errno.h> 40#include <fcntl.h> 41#include <limits.h> 42#include <stdio.h> 43#include <stdlib.h> 44#include <string.h> 45#include <unistd.h> 46#include <sysexits.h> 47 48static char path[] = "dup"; 49static void check_mode(bool, bool, bool); 50 51static void 52check_mode(bool _dup, bool _dup2, bool _dup3) 53{ 54 int mode[3] = { O_RDONLY, O_WRONLY, O_RDWR }; 55 int perm[5] = { 0700, 0400, 0600, 0444, 0666 }; 56 struct stat st, st1; 57 int fd, fd1, fd2; 58 size_t i, j; 59 60 /* 61 * Check that a duplicated descriptor 62 * retains the mode of the original file. 63 */ 64 for (i = 0; i < __arraycount(mode); i++) { 65 66 for (j = 0; j < __arraycount(perm); j++) { 67 68 fd1 = open(path, mode[i] | O_CREAT, perm[j]); 69 fd2 = open("/etc/passwd", O_RDONLY); 70 71 ATF_REQUIRE(fd1 >= 0); 72 ATF_REQUIRE(fd2 >= 0); 73 74 if (_dup != false) 75 fd = dup(fd1); 76 else if (_dup2 != false) 77 fd = dup2(fd1, fd2); 78 else if (_dup3 != false) 79 fd = dup3(fd1, fd2, O_CLOEXEC); 80 else { 81 fd = -1; 82 } 83 84 ATF_REQUIRE(fd >= 0); 85 86 (void)memset(&st, 0, sizeof(struct stat)); 87 (void)memset(&st1, 0, sizeof(struct stat)); 88 89 ATF_REQUIRE(fstat(fd, &st) == 0); 90 ATF_REQUIRE(fstat(fd1, &st1) == 0); 91 92 if (st.st_mode != st1.st_mode) 93 atf_tc_fail("invalid mode"); 94 95 (void)close(fd); 96 (void)close(fd1); 97 (void)close(fd2); 98 (void)unlink(path); 99 } 100 } 101} 102 103ATF_TC(dup2_basic); 104ATF_TC_HEAD(dup2_basic, tc) 105{ 106 atf_tc_set_md_var(tc, "descr", "A basic test of dup2(2)"); 107} 108 109ATF_TC_BODY(dup2_basic, tc) 110{ 111 int fd, fd1, fd2; 112 113 fd1 = open("/etc/passwd", O_RDONLY); 114 fd2 = open("/etc/passwd", O_RDONLY); 115 116 ATF_REQUIRE(fd1 >= 0); 117 ATF_REQUIRE(fd2 >= 0); 118 119 fd = dup2(fd1, fd2); 120 ATF_REQUIRE(fd >= 0); 121 122 if (fd != fd2) 123 atf_tc_fail("invalid descriptor"); 124 125 (void)close(fd); 126 (void)close(fd1); 127 128 ATF_REQUIRE(close(fd2) != 0); 129} 130 131ATF_TC(dup2_err); 132ATF_TC_HEAD(dup2_err, tc) 133{ 134 atf_tc_set_md_var(tc, "descr", "Test error conditions of dup2(2)"); 135} 136 137ATF_TC_BODY(dup2_err, tc) 138{ 139 int fd; 140 141 fd = open("/etc/passwd", O_RDONLY); 142 ATF_REQUIRE(fd >= 0); 143 144 errno = 0; 145 ATF_REQUIRE_ERRNO(EBADF, dup2(-1, -1) == -1); 146 147 errno = 0; 148 ATF_REQUIRE_ERRNO(EBADF, dup2(fd, -1) == -1); 149 150 errno = 0; 151 ATF_REQUIRE_ERRNO(EBADF, dup2(-1, fd) == -1); 152 153 /* 154 * Note that this should not fail with EINVAL. 155 */ 156 ATF_REQUIRE(dup2(fd, fd) != -1); 157 158 (void)close(fd); 159} 160 161ATF_TC(dup2_max); 162ATF_TC_HEAD(dup2_max, tc) 163{ 164 atf_tc_set_md_var(tc, "descr", "Test dup2(2) against limits"); 165} 166 167ATF_TC_BODY(dup2_max, tc) 168{ 169 struct rlimit res; 170 171 (void)memset(&res, 0, sizeof(struct rlimit)); 172 (void)getrlimit(RLIMIT_NOFILE, &res); 173 174 errno = 0; 175 ATF_REQUIRE_ERRNO(EBADF, dup2(STDERR_FILENO, res.rlim_cur + 1) == -1); 176} 177 178ATF_TC_WITH_CLEANUP(dup2_mode); 179ATF_TC_HEAD(dup2_mode, tc) 180{ 181 atf_tc_set_md_var(tc, "descr", "A basic test of dup2(2)"); 182} 183 184ATF_TC_BODY(dup2_mode, tc) 185{ 186 check_mode(false, true, false); 187} 188 189ATF_TC_CLEANUP(dup2_mode, tc) 190{ 191 (void)unlink(path); 192} 193 194 195ATF_TC(dup3_err); 196ATF_TC_HEAD(dup3_err, tc) 197{ 198 atf_tc_set_md_var(tc, "descr", 199 "Test error conditions of dup3(2) (PR lib/45148)"); 200} 201 202ATF_TC_BODY(dup3_err, tc) 203{ 204 int fd; 205 206 fd = open("/etc/passwd", O_RDONLY); 207 ATF_REQUIRE(fd >= 0); 208 209 errno = 0; 210 ATF_REQUIRE(dup3(fd, fd, O_CLOEXEC) != -1); 211 212 errno = 0; 213 ATF_REQUIRE_ERRNO(EBADF, dup3(-1, -1, O_CLOEXEC) == -1); 214 215 errno = 0; 216 ATF_REQUIRE_ERRNO(EBADF, dup3(fd, -1, O_CLOEXEC) == -1); 217 218 errno = 0; 219 ATF_REQUIRE_ERRNO(EBADF, dup3(-1, fd, O_CLOEXEC) == -1); 220 221 errno = 0; 222 ATF_REQUIRE_ERRNO(EINVAL, dup3(fd, 1, O_NOFOLLOW) == -1); 223 224 (void)close(fd); 225} 226 227ATF_TC(dup3_max); 228ATF_TC_HEAD(dup3_max, tc) 229{ 230 atf_tc_set_md_var(tc, "descr", "Test dup3(2) against limits"); 231} 232 233ATF_TC_BODY(dup3_max, tc) 234{ 235 struct rlimit res; 236 237 (void)memset(&res, 0, sizeof(struct rlimit)); 238 (void)getrlimit(RLIMIT_NOFILE, &res); 239 240 errno = 0; 241 ATF_REQUIRE_ERRNO(EBADF, dup3(STDERR_FILENO, 242 res.rlim_cur + 1, O_CLOEXEC) == -1); 243} 244 245ATF_TC_WITH_CLEANUP(dup3_mode); 246ATF_TC_HEAD(dup3_mode, tc) 247{ 248 atf_tc_set_md_var(tc, "descr", "A basic test of dup3(2)"); 249} 250 251ATF_TC_BODY(dup3_mode, tc) 252{ 253 check_mode(false, false, true); 254} 255 256ATF_TC_CLEANUP(dup3_mode, tc) 257{ 258 (void)unlink(path); 259} 260 261ATF_TC(dup_err); 262ATF_TC_HEAD(dup_err, tc) 263{ 264 atf_tc_set_md_var(tc, "descr", "Test error conditions of dup(2)"); 265} 266 267ATF_TC_BODY(dup_err, tc) 268{ 269 270 errno = 0; 271 ATF_REQUIRE_ERRNO(EBADF, dup(-1) == -1); 272} 273 274ATF_TC_WITH_CLEANUP(dup_max); 275ATF_TC_HEAD(dup_max, tc) 276{ 277 atf_tc_set_md_var(tc, "descr", "Test dup(2) against limits"); 278} 279 280ATF_TC_BODY(dup_max, tc) 281{ 282 struct rlimit res; 283 int *buf, fd, sta; 284 size_t i, n; 285 pid_t pid; 286 287 pid = fork(); 288 ATF_REQUIRE(pid >= 0); 289 290 if (pid == 0) { 291 292 /* 293 * Open a temporary file until the 294 * maximum number of open files is 295 * reached. Ater that dup(2) family 296 * should fail with EMFILE. 297 */ 298 (void)closefrom(0); 299 (void)memset(&res, 0, sizeof(struct rlimit)); 300 301 n = 10; 302 res.rlim_cur = res.rlim_max = n; 303 if (setrlimit(RLIMIT_NOFILE, &res) != 0) 304 _exit(EX_OSERR); 305 306 buf = calloc(n, sizeof(int)); 307 308 if (buf == NULL) 309 _exit(EX_OSERR); 310 311 buf[0] = mkstemp(path); 312 313 if (buf[0] < 0) 314 _exit(EX_OSERR); 315 316 for (i = 1; i < n; i++) { 317 318 buf[i] = open(path, O_RDONLY); 319 320 if (buf[i] < 0) 321 _exit(EX_OSERR); 322 } 323 324 errno = 0; 325 fd = dup(buf[0]); 326 327 if (fd != -1 || errno != EMFILE) 328 _exit(EX_DATAERR); 329 330 _exit(EXIT_SUCCESS); 331 } 332 333 (void)wait(&sta); 334 335 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) { 336 337 if (WEXITSTATUS(sta) == EX_OSERR) 338 atf_tc_fail("system call error"); 339 340 if (WEXITSTATUS(sta) == EX_DATAERR) 341 atf_tc_fail("dup(2) dupped more than RLIMIT_NOFILE"); 342 343 atf_tc_fail("unknown error"); 344 } 345 346 (void)unlink(path); 347} 348 349ATF_TC_CLEANUP(dup_max, tc) 350{ 351 (void)unlink(path); 352} 353 354ATF_TC_WITH_CLEANUP(dup_mode); 355ATF_TC_HEAD(dup_mode, tc) 356{ 357 atf_tc_set_md_var(tc, "descr", "A basic test of dup(2)"); 358} 359 360ATF_TC_BODY(dup_mode, tc) 361{ 362 check_mode(true, false, false); 363} 364 365ATF_TC_CLEANUP(dup_mode, tc) 366{ 367 (void)unlink(path); 368} 369 370ATF_TP_ADD_TCS(tp) 371{ 372 373 ATF_TP_ADD_TC(tp, dup2_basic); 374 ATF_TP_ADD_TC(tp, dup2_err); 375 ATF_TP_ADD_TC(tp, dup2_max); 376 ATF_TP_ADD_TC(tp, dup2_mode); 377 ATF_TP_ADD_TC(tp, dup3_err); 378 ATF_TP_ADD_TC(tp, dup3_max); 379 ATF_TP_ADD_TC(tp, dup3_mode); 380 ATF_TP_ADD_TC(tp, dup_err); 381 ATF_TP_ADD_TC(tp, dup_max); 382 ATF_TP_ADD_TC(tp, dup_mode); 383 384 return atf_no_error(); 385} 386