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>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#define MAX_ERROR 4
static int errct = 0;
static const char *executable, *subtest;
#define ERR (e(__LINE__))
static void e(int n)
{
printf("File %s, error line %d, errno %d: %s\n",
subtest, n, errno, strerror(errno));
if (errct++ > MAX_ERROR)
{
printf("Too many errors; test aborted\n");
exit(1);
}
}
static void quit(void)
{
if (errct == 0)
{
printf("ok\n");
exit(0);
}
else
{
printf("%d errors\n", errct);
exit(1);
}
}
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 void check_realpath(const char *path, int expected_errno)
{
char buffer[PATH_MAX + 1], *resolved_path;
struct stat statbuf[2];
assert(path);
/* run realpath */
subtest = path;
resolved_path = realpath(path, buffer);
/* do we get errors when expected? */
if (expected_errno)
{
if (errno != expected_errno) ERR;
if (resolved_path) ERR;
subtest = NULL;
return;
}
/* do we get success when expected? */
if (!resolved_path)
{
ERR;
subtest = NULL;
return;
}
errno = 0;
/* do the paths point to the same file? */
if (stat(path, &statbuf[0]) < 0) { ERR; return; }
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;
/* 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;
}
subtest = NULL;
}
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];
/* check with the path itself */
check_realpath_step_by_step(path, 0);
/* don't go too deep */
if (depth < 1)
return;
/* loop through subdirectories (including . and ..) */
if (!(dir = opendir(path)))
{
if (errno != ENOTDIR)
ERR;
return;
}
while (dirent = readdir(dir))
{
/* 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 "/t43"
#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;
int slashlen;
/* 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 cleanup(const char *path)
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{
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DIR *dir;
struct dirent *dirent;
char pathsub[PATH_MAX + 1];
struct stat statbuf;
/* determine file type, avoid following links */
if (lstat(path, &statbuf) < 0)
{
if (errno != ENOENT) ERR;
return;
}
/* only recursively process directories (NOT symlinks!) */
if ((statbuf.st_mode & S_IFMT) != S_IFDIR)
{
if (unlink(path) < 0) ERR;
return;
}
/* loop through subdirectories (excluding . and ..) */
if (!(dir = opendir(path)))
{
ERR;
return;
}
while (dirent = readdir(dir))
{
/* ignore current and parent directories */
if (strcmp(dirent->d_name, ".") == 0 ||
strcmp(dirent->d_name, "..") == 0)
continue;
/* build path */
if (!pathncat(pathsub, sizeof(pathsub), path, dirent->d_name))
{
ERR;
continue;
}
/* delete path */
cleanup(pathsub);
}
if (closedir(dir) < 0) ERR;
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/* remove the (now empty) directory itself */
if (rmdir(path) < 0) ERR;
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}
int main(int argc, char **argv)
{
char buffer1[PATH_MAX + 1], buffer2[PATH_MAX + 1];
/* initialize */
printf("Test 43 ");
fflush(stdout);
executable = argv[0];
getcwd(basepath, sizeof(basepath));
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cleanup(addbasepath(buffer1, PATH_BASE));
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/* prepare some symlinks to make it more difficult */
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if (mkdir(addbasepath(buffer1, PATH_BASE), S_IRWXU) < 0) ERR;
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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 */
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cleanup(addbasepath(buffer1, PATH_BASE));
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/* done */
quit();
return(-1); /* impossible */
}