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      1 /*      $NetBSD: h_cwd.c,v 1.3 2012/04/17 09:23:21 jruoho Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2011 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
     17  * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
     18  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     20  * IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY
     21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
     23  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
     25  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     26  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
     27  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #include <sys/types.h>
     31 #include <sys/stat.h>
     32 
     33 #include <err.h>
     34 #include <errno.h>
     35 #include <fcntl.h>
     36 #include <stdlib.h>
     37 #include <string.h>
     38 #include <unistd.h>
     39 
     40 static const char *prefix;
     41 static size_t prefixlen;
     42 static char buf[1024];
     43 static char pwd[1024];
     44 
     45 static const char *
     46 makepath(const char *tail)
     47 {
     48 
     49 	strcpy(buf, prefix);
     50 	if (prefix[prefixlen-1] != '/')
     51 		strcat(buf, "/");
     52 	strcat(buf, tail);
     53 
     54 	return buf;
     55 }
     56 
     57 static void
     58 dochdir(const char *path, const char *errmsg)
     59 {
     60 
     61 	if (chdir(path) == -1)
     62 		err(EXIT_FAILURE, "%s", errmsg);
     63 }
     64 
     65 static void
     66 dofchdir(const char *path, const char *errmsg)
     67 {
     68 	int fd;
     69 
     70 	fd = open(path, O_RDONLY);
     71 	if (fd == -1)
     72 		err(EXIT_FAILURE, "open %s", errmsg);
     73 	if (fchdir(fd) == -1)
     74 		err(EXIT_FAILURE, "fchdir %s", errmsg);
     75 	close(fd);
     76 }
     77 static void (*thechdir)(const char *, const char *);
     78 
     79 static void
     80 simple(void)
     81 {
     82 
     83 	thechdir(prefix, "chdir1");
     84 	if (getcwd(pwd, sizeof(pwd)) == NULL)
     85 		err(EXIT_FAILURE, "getcwd1");
     86 	if (strcmp(pwd, prefix) != 0)
     87 		errx(EXIT_FAILURE, "strcmp1");
     88 
     89 	if (mkdir("dir", 0777) == -1)
     90 		err(EXIT_FAILURE, "mkdir2");
     91 	thechdir("dir", "chdir2");
     92 	if (getcwd(pwd, sizeof(pwd)) == NULL)
     93 		err(EXIT_FAILURE, "getcwd2");
     94 	if (strcmp(pwd, makepath("dir")) != 0)
     95 		errx(EXIT_FAILURE, "strcmp2");
     96 
     97 	if (mkdir("dir", 0777) == -1)
     98 		err(EXIT_FAILURE, "mkdir3");
     99 	thechdir("dir", "chdir3");
    100 	if (getcwd(pwd, sizeof(pwd)) == NULL)
    101 		err(EXIT_FAILURE, "getcwd3");
    102 	if (strcmp(pwd, makepath("dir/dir")) != 0)
    103 		errx(EXIT_FAILURE, "strcmp3");
    104 
    105 	thechdir("..", "chdir4");
    106 	if (getcwd(pwd, sizeof(pwd)) == NULL)
    107 		err(EXIT_FAILURE, "getcwd4");
    108 	if (strcmp(pwd, makepath("dir")) != 0)
    109 		errx(EXIT_FAILURE, "strcmp4");
    110 
    111 
    112 	thechdir("../../../../../../..", "chdir5");
    113 	if (getcwd(pwd, sizeof(pwd)) == NULL)
    114 		err(EXIT_FAILURE, "getcwd5");
    115 	if (strcmp(pwd, prefix) != 0)
    116 		errx(EXIT_FAILURE, "strcmp5");
    117 
    118 	thechdir("/", "chdir6");
    119 	if (getcwd(pwd, sizeof(pwd)) == NULL)
    120 		err(EXIT_FAILURE, "getcwd6");
    121 	if (strcmp(pwd, "/") != 0)
    122 		errx(EXIT_FAILURE, "strcmp6");
    123 }
    124 
    125 static void
    126 symlinktest(void)
    127 {
    128 
    129 	thechdir(prefix, "chdir1");
    130 	if (mkdir("adir", 0777) == -1)
    131 		err(EXIT_FAILURE, "mkdir1");
    132 	if (mkdir("anotherdir", 0777) == -1)
    133 		err(EXIT_FAILURE, "mkdir2");
    134 
    135 	if (symlink("/adir", "anotherdir/lincthesink") == -1)
    136 		err(EXIT_FAILURE, "symlink");
    137 
    138 	thechdir("anotherdir/lincthesink", "chdir2");
    139 	if (getcwd(pwd, sizeof(pwd)) == NULL)
    140 		err(EXIT_FAILURE, "getcwd");
    141 	if (strcmp(pwd, makepath("adir")) != 0)
    142 		errx(EXIT_FAILURE, "strcmp");
    143 }
    144 
    145 int
    146 main(int argc, char *argv[])
    147 {
    148 
    149 	if (argc != 4)
    150 		errx(1, "usage");
    151 
    152 	prefix = argv[1];
    153 	prefixlen = strlen(argv[1]);
    154 
    155 	if (strcmp(argv[3], "chdir") == 0)
    156 		thechdir = dochdir;
    157 	else if (strcmp(argv[3], "fchdir") == 0)
    158 		thechdir = dofchdir;
    159 	else
    160 		errx(EXIT_FAILURE, "invalid chdir type");
    161 
    162 	if (strcmp(argv[2], "simple") == 0)
    163 		simple();
    164 	if (strcmp(argv[2], "symlink") == 0)
    165 		symlinktest();
    166 
    167 	return EXIT_SUCCESS;
    168 }
    169