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      1 /*	$NetBSD: t_readlinkat.c,v 1.4 2017/01/10 15:13:56 christos Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2012 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Emmanuel Dreyfus.
      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_readlinkat.c,v 1.4 2017/01/10 15:13:56 christos Exp $");
     33 
     34 #include <sys/param.h>
     35 #include <sys/stat.h>
     36 #include <atf-c.h>
     37 #include <errno.h>
     38 #include <fcntl.h>
     39 #include <limits.h>
     40 #include <paths.h>
     41 #include <stdio.h>
     42 #include <string.h>
     43 #include <unistd.h>
     44 
     45 #define DIR "dir"
     46 #define FILE "dir/readlinkat"
     47 #define BASEFILE "readlinkat"
     48 #define LINK "dir/symlink"
     49 #define BASELINK "symlink"
     50 #define FILEERR "dir/readlinkaterr"
     51 
     52 ATF_TC(readlinkat_fd);
     53 ATF_TC_HEAD(readlinkat_fd, tc)
     54 {
     55 	atf_tc_set_md_var(tc, "descr", "See that readlinkat works with fd");
     56 }
     57 ATF_TC_BODY(readlinkat_fd, tc)
     58 {
     59 	int dfd;
     60 	int fd;
     61 	ssize_t len;
     62 	char buf[MAXPATHLEN];
     63 
     64 	ATF_REQUIRE(mkdir(DIR, 0755) == 0);
     65 	ATF_REQUIRE((fd = open(FILE, O_CREAT|O_RDWR, 0644)) != -1);
     66 	ATF_REQUIRE(close(fd) == 0);
     67 	ATF_REQUIRE(symlink(FILE, LINK) == 0);
     68 
     69 	ATF_REQUIRE((dfd = open(DIR, O_RDONLY, 0)) != -1);
     70 	len = readlinkat(dfd, BASELINK, buf, sizeof(buf)-1);
     71 	ATF_REQUIRE(len != -1);
     72 	buf[len] = 0;
     73 	ATF_REQUIRE(close(dfd) == 0);
     74 
     75 	ATF_REQUIRE(strcmp(buf, FILE) == 0);
     76 }
     77 
     78 ATF_TC(readlinkat_fdcwd);
     79 ATF_TC_HEAD(readlinkat_fdcwd, tc)
     80 {
     81 	atf_tc_set_md_var(tc, "descr",
     82 			  "See that readlinkat works with fd as AT_FDCWD");
     83 }
     84 ATF_TC_BODY(readlinkat_fdcwd, tc)
     85 {
     86 	int fd;
     87 	ssize_t len;
     88 	char buf[MAXPATHLEN];
     89 
     90 	ATF_REQUIRE(mkdir(DIR, 0755) == 0);
     91 	ATF_REQUIRE((fd = open(FILE, O_CREAT|O_RDWR, 0644)) != -1);
     92 	ATF_REQUIRE(close(fd) == 0);
     93 	ATF_REQUIRE(symlink(FILE, LINK) == 0);
     94 
     95 	len = readlinkat(AT_FDCWD, LINK, buf, sizeof(buf)-1);
     96 	ATF_REQUIRE(len != -1);
     97 	buf[len] = 0;
     98 
     99 	ATF_REQUIRE(strcmp(buf, FILE) == 0);
    100 }
    101 
    102 ATF_TC(readlinkat_fdcwderr);
    103 ATF_TC_HEAD(readlinkat_fdcwderr, tc)
    104 {
    105 	atf_tc_set_md_var(tc, "descr",
    106 		  "See that readlinkat fails with fd as AT_FDCWD and bad path");
    107 }
    108 ATF_TC_BODY(readlinkat_fdcwderr, tc)
    109 {
    110 	char buf[MAXPATHLEN];
    111 
    112 	ATF_REQUIRE(readlinkat(AT_FDCWD, LINK, buf, sizeof(buf)) == -1);
    113 }
    114 
    115 ATF_TC(readlinkat_fderr1);
    116 ATF_TC_HEAD(readlinkat_fderr1, tc)
    117 {
    118 	atf_tc_set_md_var(tc, "descr", "See that readlinkat fail with bad path");
    119 }
    120 ATF_TC_BODY(readlinkat_fderr1, tc)
    121 {
    122 	int dfd;
    123 
    124 	ATF_REQUIRE(mkdir(DIR, 0755) == 0);
    125 	ATF_REQUIRE((dfd = open(DIR, O_RDONLY, 0)) != -1);
    126 	ATF_REQUIRE(readlinkat(dfd, FILEERR, F_OK, 0) == -1);
    127 	ATF_REQUIRE(close(dfd) == 0);
    128 }
    129 
    130 ATF_TC(readlinkat_fderr2);
    131 ATF_TC_HEAD(readlinkat_fderr2, tc)
    132 {
    133 	atf_tc_set_md_var(tc, "descr", "See that readlinkat fails with fd as -1");
    134 }
    135 ATF_TC_BODY(readlinkat_fderr2, tc)
    136 {
    137 	int fd;
    138 	char buf[MAXPATHLEN];
    139 
    140 	ATF_REQUIRE(mkdir(DIR, 0755) == 0);
    141 	ATF_REQUIRE((fd = open(FILE, O_CREAT|O_RDWR, 0644)) != -1);
    142 	ATF_REQUIRE(close(fd) == 0);
    143 	ATF_REQUIRE(symlink(FILE, LINK) == 0);
    144 
    145 	ATF_REQUIRE(readlinkat(-1, LINK, buf, sizeof(buf)) == -1);
    146 }
    147 
    148 ATF_TP_ADD_TCS(tp)
    149 {
    150 
    151 	ATF_TP_ADD_TC(tp, readlinkat_fd);
    152 	ATF_TP_ADD_TC(tp, readlinkat_fdcwd);
    153 	ATF_TP_ADD_TC(tp, readlinkat_fdcwderr);
    154 	ATF_TP_ADD_TC(tp, readlinkat_fderr1);
    155 	ATF_TP_ADD_TC(tp, readlinkat_fderr2);
    156 
    157 	return atf_no_error();
    158 }
    159