minix/test/test43.c

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/* Tests for MINIX3 realpath(3) - by Erik van der Kouwe */
#define _POSIX_SOURCE 1
#include <assert.h>
#include <dirent.h>
#include <errno.h>
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#include <libgen.h>
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#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#define MAX_ERROR 3
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int subtest;
static const char *executable;
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#include "common.c"
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#define ERR (e(__LINE__))
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static char *remove_last_path_component(char *path)
{
char *current, *last;
assert(path);
/* find last slash */
last = NULL;
for (current = path; *current; current++)
if (*current == '/')
last = current;
/* check path component */
if (last)
{
if (strcmp(last + 1, ".") == 0) ERR;
if (strcmp(last + 1, "..") == 0) ERR;
}
/* if only root path slash, we are done */
if (last <= path)
return NULL;
/* chop off last path component */
*last = 0;
return path;
}
static int check_path_components(const char *path)
{
char buffer[PATH_MAX + 1], *bufferpos;
struct stat statbuf;
assert(strlen(path) < sizeof(buffer));
bufferpos = buffer;
while (*path)
{
/* copy next path segment */
do
{
*(bufferpos++) = *(path++);
} while (*path && *path != '/');
*bufferpos = 0;
/*
* is this a valid path segment? if not, return errno.
* one exception: the last path component need not exist
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* - unless it is actually a dangling symlink
*/
if (stat(buffer, &statbuf) < 0 &&
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(*path || errno != ENOENT ||
lstat(buffer, &statbuf) == 0))
return errno;
}
return 0;
}
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static void check_realpath(const char *path, int expected_errno)
{
char buffer[PATH_MAX + 1], *resolved_path;
int expected_errno2;
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struct stat statbuf[2];
assert(path);
/* any errors in the path that realpath should report? */
expected_errno2 = check_path_components(path);
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/* run realpath */
errno = 0;
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resolved_path = realpath(path, buffer);
/* do we get errors when expected? */
if (expected_errno || expected_errno2)
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{
if (resolved_path) ERR;
if (errno != expected_errno && errno != expected_errno2) ERR;
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return;
}
/* do we get success when expected? */
if (!resolved_path)
{
ERR;
return;
}
errno = 0;
/* do the paths point to the same file? (only check if exists) */
if (stat(path, &statbuf[0]) < 0)
{
if (errno != ENOENT) { ERR; return; }
}
else
{
if (stat(resolved_path, &statbuf[1]) < 0) { ERR; return; }
if (statbuf[0].st_dev != statbuf[1].st_dev) ERR;
if (statbuf[0].st_ino != statbuf[1].st_ino) ERR;
}
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/* is the path absolute? */
if (resolved_path[0] != '/') ERR;
/* is each path element allowable? */
while (remove_last_path_component(resolved_path))
{
/* not a symlink? */
if (lstat(resolved_path, &statbuf[1]) < 0) { ERR; return; }
if ((statbuf[1].st_mode & S_IFMT) != S_IFDIR) ERR;
}
}
static void check_realpath_step_by_step(const char *path, int expected_errno)
{
char buffer[PATH_MAX + 1];
const char *path_current;
assert(path);
assert(strlen(path) < sizeof(buffer));
/* check the absolute path */
check_realpath(path, expected_errno);
/* try with different CWDs */
for (path_current = path; *path_current; path_current++)
if (path_current[0] == '/' && path_current[1])
{
/* set CWD */
memcpy(buffer, path, path_current - path + 1);
buffer[path_current - path + 1] = 0;
if (chdir(buffer) < 0) { ERR; continue; }
/* perform test */
check_realpath(path_current + 1, expected_errno);
}
}
static char *pathncat(char *buffer, size_t size, const char *path1, const char *path2)
{
size_t len1, len2, lenslash;
assert(buffer);
assert(path1);
assert(path2);
/* check whether it fits */
len1 = strlen(path1);
len2 = strlen(path2);
lenslash = (len1 > 0 && path1[len1 - 1] == '/') ? 0 : 1;
if (len1 >= size || /* check individual components to avoid overflow */
len2 >= size ||
len1 + len2 + lenslash >= size)
return NULL;
/* perform the copy */
memcpy(buffer, path1, len1);
if (lenslash)
buffer[len1] = '/';
memcpy(buffer + len1 + lenslash, path2, len2 + 1);
return buffer;
}
static void check_realpath_recurse(const char *path, int depth)
{
DIR *dir;
struct dirent *dirent;
char pathsub[PATH_MAX + 1];
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struct stat st;
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/* check with the path itself */
check_realpath_step_by_step(path, 0);
/* don't go too deep */
if (depth < 1)
return;
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/* don't bother with non-directories. Due to timeouts in drivers we
* might not get expected results and takes way too long */
if (stat(path, &st) != 0) {
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/* dangling symlinks may cause legitimate failures here */
if (lstat(path, &st) != 0) ERR;
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return;
}
if (!S_ISDIR(st.st_mode))
return;
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/* loop through subdirectories (including . and ..) */
if (!(dir = opendir(path)))
{
/* Opening some special files might result in errors when the
* corresponding hardware is not present, or simply when access
* rights prohibit access (e.g., /dev/log).
*/
if (errno != ENOTDIR
&& errno != ENXIO && errno != EIO && errno != EACCES) {
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ERR;
}
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return;
}
while ((dirent = readdir(dir)) != NULL)
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{
/* build path */
if (!pathncat(pathsub, sizeof(pathsub), path, dirent->d_name))
{
ERR;
continue;
}
/* check path */
check_realpath_recurse(pathsub, depth - 1);
}
if (closedir(dir) < 0) ERR;
}
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#define PATH_DEPTH 4
#define PATH_BASE "/."
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#define L(x) PATH_BASE "/link_" #x ".tmp"
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static char basepath[PATH_MAX + 1];
static char *addbasepath(char *buffer, const char *path)
{
size_t basepathlen, pathlen;
/* assumption: both start with slash and neither end with it */
assert(basepath[0] == '/');
assert(basepath[strlen(basepath) - 1] != '/');
assert(buffer);
assert(path);
assert(path[0] == '/');
/* check result length */
basepathlen = strlen(basepath);
pathlen = strlen(path);
if (basepathlen + pathlen > PATH_MAX)
{
printf("path too long\n");
exit(-1);
}
/* concatenate base path and path */
memcpy(buffer, basepath, basepathlen);
memcpy(buffer + basepathlen, path, pathlen + 1);
return buffer;
}
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static void test_dirname(const char *path, const char *exp)
{
char buffer[PATH_MAX];
int i, j;
size_t pathlen = strlen(path);
char *pathout;
assert(pathlen + 3 < PATH_MAX);
/* try with no, one or two trailing slashes */
for (i = 0; i < 3; i++)
{
/* no trailing slashes for empty string */
if (pathlen < 1 && i > 0)
continue;
/* prepare buffer */
strcpy(buffer, path);
for (j = 0; j < i; j++)
buffer[pathlen + j] = '/';
buffer[pathlen + i] = 0;
/* perform test */
pathout = dirname(buffer);
if (strcmp(pathout, exp) != 0)
ERR;
}
}
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int main(int argc, char **argv)
{
char buffer1[PATH_MAX + 1], buffer2[PATH_MAX + 1];
subtest = 1;
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/* initialize */
start(43);
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executable = argv[0];
getcwd(basepath, sizeof(basepath));
/* prepare some symlinks to make it more difficult */
if (symlink("/", addbasepath(buffer1, L(1))) < 0) ERR;
if (symlink(basepath, addbasepath(buffer1, L(2))) < 0) ERR;
/* perform some tests */
check_realpath_recurse(basepath, PATH_DEPTH);
/* now try with recursive symlinks */
if (symlink(addbasepath(buffer1, L(3)), addbasepath(buffer2, L(3))) < 0) ERR;
if (symlink(addbasepath(buffer1, L(5)), addbasepath(buffer2, L(4))) < 0) ERR;
if (symlink(addbasepath(buffer1, L(4)), addbasepath(buffer2, L(5))) < 0) ERR;
check_realpath_step_by_step(addbasepath(buffer1, L(3)), ELOOP);
check_realpath_step_by_step(addbasepath(buffer1, L(4)), ELOOP);
check_realpath_step_by_step(addbasepath(buffer1, L(5)), ELOOP);
/* delete the symlinks */
cleanup();
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/* also test dirname */
test_dirname("", ".");
test_dirname(".", ".");
test_dirname("..", ".");
test_dirname("x", ".");
test_dirname("xy", ".");
test_dirname("x/y", "x");
test_dirname("xy/z", "xy");
test_dirname("x/yz", "x");
test_dirname("ab/cd", "ab");
test_dirname("x//y", "x");
test_dirname("xy//z", "xy");
test_dirname("x//yz", "x");
test_dirname("ab//cd", "ab");
test_dirname("/", "/");
test_dirname("/x", "/");
test_dirname("/xy", "/");
test_dirname("/x/y", "/x");
test_dirname("/xy/z", "/xy");
test_dirname("/x/yz", "/x");
test_dirname("/ab/cd", "/ab");
test_dirname("/x//y", "/x");
test_dirname("/xy//z", "/xy");
test_dirname("/x//yz", "/x");
test_dirname("/ab//cd", "/ab");
test_dirname("/usr/src", "/usr");
test_dirname("/usr/src/test", "/usr/src");
test_dirname("usr/src", "usr");
test_dirname("usr/src/test", "usr/src");
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/* done */
quit();
return(-1); /* impossible */
}