char* realpath(const char* file, char* dest) {
int fd=open(".",O_RDONLY); /* save directory */
char* res=myrealpath(file,dest,31);
fchdir(fd);
close(fd);
return res;
}
char *
canonicalize_path(const char *path)
{
char *canonical;
char *p;
if (path == NULL)
return NULL;
canonical = malloc(PATH_MAX+2);
if (!canonical)
return NULL;
if (!myrealpath(path, canonical, PATH_MAX+1))
{
free(canonical);
return strdup(path);
}
p = strrchr(canonical, '/');
if (p && strncmp(p, "/dm-", 4) == 0 && isdigit(*(p + 4)))
{
p = canonicalize_dm_name(p+1);
if (p)
{
free(canonical);
return p;
}
}
return canonical;
}
char *
canonicalize_path(const char *path)
{
char canonical[PATH_MAX+2];
char *p;
if (path == NULL)
return NULL;
if (!myrealpath(path, canonical, PATH_MAX+1)) {
char *res = strdup(path);
if (res) {
p = strrchr(res, '/');
/* delete trailing slash */
if (p && p > res && *(p + 1) == '\0')
*p = '\0';
}
return res;
}
p = strrchr(canonical, '/');
if (p && strncmp(p, "/dm-", 4) == 0 && isdigit(*(p + 4))) {
p = canonicalize_dm_name(p+1);
if (p)
return p;
}
return strdup(canonical);
}
void set_cmdfile_history_file(int linenr, char *cmd, char *par)
{
if (par[0] == 0x00)
{
cmdfile_h.history_file = NULL;
cmdfile_h.history_size = 0;
}
else
{
cmdfile_h.history_file = myrealpath(par);
}
}
void set_searchhistory_file(int linenr, char *cmd, char *par)
{
if (par[0] == 0x00)
{
search_h.history_file = NULL;
search_h.history_size = 0;
}
else
{
search_h.history_file = myrealpath(par);
}
}
int nilfs_cleaner_reload(struct nilfs_cleaner *cleaner, const char *conffile)
{
struct nilfs_cleaner_request_with_path req;
struct nilfs_cleaner_response res;
size_t pathlen, reqsz;
int bytes, ret = -1;
if (cleaner->sendq < 0 || cleaner->recvq < 0) {
errno = EBADF;
goto out;
}
if (nilfs_cleaner_clear_queueu(cleaner) < 0)
goto out;
if (conffile) {
if (myrealpath(conffile, req.pathname,
NILFS_CLEANER_MSG_MAX_PATH) == NULL)
goto out;
pathlen = strlen(req.pathname);
req.hdr.argsize = pathlen + 1;
reqsz = sizeof(req.hdr) + pathlen + 1;
} else {
req.hdr.argsize = 0;
reqsz = sizeof(req.hdr);
}
req.hdr.cmd = NILFS_CLEANER_CMD_RELOAD;
uuid_copy(req.hdr.client_uuid, cleaner->client_uuid);
ret = mq_send(cleaner->sendq, (char *)&req, reqsz,
NILFS_CLEANER_PRIO_NORMAL);
if (ret < 0)
goto out;
bytes = mq_receive(cleaner->recvq, (char *)&res, sizeof(res), NULL);
if (bytes < sizeof(res)) {
if (bytes >= 0)
errno = EIO;
ret = -1;
goto out;
}
if (res.result == NILFS_CLEANER_RSP_NACK) {
ret = -1;
errno = res.err;
}
out:
return ret;
}
static int
is_in_proc_swaps(const char *fname) {
int i;
char canonical[PATH_MAX + 2];
if (!myrealpath(fname, canonical, PATH_MAX + 1)) {
fprintf(stderr, _("%s: cannot canonicalize %s: %s\n"),
progname, fname, strerror(errno));
strncpy(canonical, fname, PATH_MAX + 1);
*(canonical + (PATH_MAX + 1)) = '\0';
}
for (i = 0; i < numSwaps; i++)
if (swapFiles[i] && !strcmp(canonical, swapFiles[i]))
return 1;
return 0;
}
char *canonicalize_path(const char *path)
{
char canonical[PATH_MAX+2];
char *p;
if (path == NULL)
return NULL;
if (!myrealpath(path, canonical, PATH_MAX+1))
return strdup(path);
p = strrchr(canonical, '/');
if (p && strncmp(p, "/dm-", 4) == 0 && isdigit(*(p + 4))) {
p = canonicalize_dm_name(p+1);
if (p)
return p;
}
return strdup(canonical);
}
/*
* "Resolve" a pathname.
*
* Makes sure that 'path' falls within the 'dir' after application of
* realpath to resolve "..", symlinks, etc. If 'create' is set, it will
* create missing intermediate directories. In detail:
*
* The path (and dir) must be absolute, or it is an error.
* If 'create' is zero, then all components of the path must exist
* or it is an error.
* If 'create' is non-zero, then missing components except the last
* will be created.
* If 'dir' is non-null, the existing part of the path must resolve
* within this directory or it is an error.
* If 'dir' is null, then the path is resolved as far as it exists
* ('create' is ignored and assumed to be zero).
*
* Returns NULL on an error, a malloc'ed pointer to a canonicalized
* path otherwise.
*/
char *
resolvepath(char *path, char *dir, int create)
{
char rpath[PATH_MAX], *next, *ep, *pathcopy;
struct stat sb;
int pathlen = strlen(path);
int dirlen = 0;
int rpathlen;
mode_t omask, cmask;
char *npath;
if (debug > 1)
info("resolvepath '%s' in dir '%s'", path, dir);
/* validate path */
if (path == NULL) {
if (debug > 1)
info(" null path");
return NULL;
}
if (path[0] != '/') {
if (debug > 1)
info(" path is not absolute");
return NULL;
}
if (pathlen >= sizeof rpath) {
if (debug > 1)
info(" path is too long");
return NULL;
}
/* validate dir */
if (dir) {
dirlen = strlen(dir);
if (dir[0] != '/') {
if (debug > 1)
info(" path and dir (%s) must be absolute",
dir);
return NULL;
}
/* XXX make dir=='/' work */
if (dirlen == 1)
dirlen = 0;
} else {
create = 0;
}
/*
* If the full path resolves, make sure it falls in dir (if given)
* and is a regular file.
*/
if (myrealpath(path, rpath) != NULL) {
if (dir && !INDIR(dir, dirlen, rpath)) {
if (debug > 1)
info(" resolved path (%s) not in dir (%s)",
rpath, dir);
return NULL;
}
if (stat(rpath, &sb) < 0 || !S_ISREG(sb.st_mode)) {
if (debug > 1)
info(" not a regular file");
return NULL;
}
return strdup(rpath);
}
if (debug > 1) {
int oerrno = errno;
info(" partially resolved to '%s' (errno %d)", rpath, errno);
errno = oerrno;
}
/*
* If create is not set or we failed for any reason other than
* a non-existent component, we return an error.
*/
if (!create || errno != ENOENT) {
if (debug > 1)
info(" realpath failed at %s with %d",
rpath, errno);
return NULL;
}
/*
* Need to create intermediate directories.
*
* First, check that what does exist of the path falls within
* the directory given.
*/
assert(dir != NULL);
if (!INDIR(dir, dirlen, rpath)) {
if (debug > 1)
info(" resolved path (%s) not in dir (%s)",
rpath, dir);
return NULL;
}
/*
* Establish permission (mode) for new directories.
* Start with permission of 'dir'; this will get updated with
* every component that resolves, so that new directories will
* get created with the permission of the most recent ancestor.
*/
if (stat(dir, &sb) < 0) {
if (debug > 1)
info(" stat failed on dir (%s)?!", dir);
return NULL;
}
cmask = (sb.st_mode & (S_IRWXU|S_IRWXG|S_IRWXO)) | S_IRWXU;
omask = umask(0);
if (debug > 1)
info(" umask=0 (was 0%o), initial cmask=0%o", omask, cmask);
/*
* Find the first component of the original path that does not
* exist (i.e., what part of the original path maps to what realpath
* returned) and create everything from there on.
*
* Note that if what realpath returned is a prefix of the original
* path then nothing was translated and we are already at the first
* component that needs creation. So we find the appropriate location
* in the original string and go from there.
*/
npath = NULL;
if ((pathcopy = strdup(path)) == NULL)
goto done;
rpathlen = strlen(rpath);
assert(rpathlen <= pathlen);
if (rpathlen > 1 && strncmp(pathcopy, rpath, rpathlen) == 0 &&
(pathcopy[rpathlen] == '\0' || pathcopy[rpathlen] == '/')) {
/* same string, start at last slash in path */
if (pathcopy[rpathlen] == '\0') {
next = rindex(pathcopy, '/');
assert(next != NULL);
}
/* rpath is a prefix, start at last slash in that prefix */
else {
next = rindex(rpath, '/');
assert(next != NULL);
next = &pathcopy[next-rpath];
}
}
/* rpath is not a prefix, must scan entire path */
else {
next = pathcopy;
}
assert(next >= pathcopy && next < &pathcopy[pathlen]);
assert(*next == '/');
next++;
if (debug > 1)
info(" pathscan: path='%s', rpath='%s', start at '%s'",
pathcopy, rpath, next);
while ((ep = index(next, '/')) != NULL) {
*ep = '\0';
if (debug > 1)
info(" testing: %s", pathcopy);
/*
* We use realpath here instead of just stat to make
* sure someone isn't actively tweaking the filesystem
* and messing with our head.
*
* If realpath fails, it should fail with ENOENT and
* the realpath-ified part should fall in our directory.
* Otherwise, someone really is playing games.
*/
if (myrealpath(pathcopy, rpath) == NULL) {
if (errno != ENOENT ||
(dir && !INDIR(dir, dirlen, rpath))) {
if (debug > 1)
info(" resolves bad (%s)\n",
rpath);
goto done;
}
/*
* We have hit a missing component.
* Create the component and carry on.
*/
if (mkdir(rpath, cmask) < 0) {
if (debug > 1)
info(" create failed (%s)\n",
rpath);
goto done;
}
if (debug > 1)
info(" created (%s)", rpath);
} else {
if (debug > 1)
info(" exists (%s)", rpath);
/*
* Update the creation permission; see comment above.
*/
if (stat(rpath, &sb) < 0) {
if (debug > 1)
info(" stat failed (%s)?!", rpath);
goto done;
}
cmask = (sb.st_mode & (S_IRWXU|S_IRWXG|S_IRWXO)) |
S_IRWXU;
}
*ep = '/';
next = ep+1;
}
/*
* We are down to the final component of the original path.
* It should either exist and be a regular file or not
* exist at all.
*/
if (myrealpath(pathcopy, rpath) == NULL &&
(errno != ENOENT || !INDIR(dir, dirlen, rpath))) {
if (debug > 1)
info(" final resolved path (%s) bad (%d)",
rpath, errno);
goto done;
}
/*
* We are in our happy place. rpath is the canonicalized path.
*/
npath = strdup(rpath);
if (debug > 1)
info("resolvepath: '%s' resolved to '%s'", path, npath);
done:
umask(omask);
if (pathcopy)
free(pathcopy);
return npath;
}
int
main (int argc, char ** argv)
{
char * result;
int fd, i, errors = 0;
char buf[PATH_MAX];
getcwd (cwd, sizeof(buf));
cwd_len = strlen (cwd);
/* this segfaults with dietlibc
man page documents:
EINVAL Either path or resolved_path is NULL. (In libc5 this would just
cause a segfault.)
errno = 0;
if (myrealpath (NULL, buf) != NULL || errno != EINVAL)
{
printf ("%s: expected return value NULL and errno set to EINVAL"
" for myrealpath(NULL,...)\n", argv[0]);
++errors;
}
*/
/* according to glibc, this test is invalid
errno = 0;
if (myrealpath ("/", NULL) != NULL || errno != EINVAL)
{
printf ("%s: expected return value NULL and errno set to EINVAL"
" for myrealpath(...,NULL)\n", argv[0]);
++errors;
}
*/
errno = 0;
if (myrealpath ("", buf) != NULL || errno != ENOENT)
{
printf ("%s: expected return value NULL and set errno to ENOENT"
" for myrealpath(\"\",...)\n", argv[0]);
++errors;
}
for (i = 0; i < (int) (sizeof (symlinks) / sizeof (symlinks[0])); ++i)
symlink (symlinks[i].value, symlinks[i].name);
fd = open("doesExist", O_CREAT | O_EXCL, 0777);
for (i = 0; i < (int) (sizeof (tests) / sizeof (tests[0])); ++i)
{
buf[0] = '\0';
result = myrealpath (tests[i].in, buf);
if (!check_path (result, tests[i].out))
{
printf ("%s: flunked test %d (expected `%s', got `%s')\n",
argv[0], i, tests[i].out ? tests[i].out : "NULL",
result ? result : "NULL");
++errors;
continue;
}
if (!check_path (buf, tests[i].out ? tests[i].out : tests[i].resolved))
{
printf ("%s: flunked test %d (expected resolved `%s', got `%s')\n",
argv[0], i, tests[i].out ? tests[i].out : tests[i].resolved,
buf);
++errors;
continue;
}
if (!tests[i].out && errno != tests[i].error)
{
printf ("%s: flunked test %d (expected errno %d, got %d)\n",
argv[0], i, tests[i].error, errno);
++errors;
continue;
}
}
getcwd (buf, sizeof(buf));
if (strcmp (buf, cwd))
{
printf ("%s: current working directory changed from %s to %s\n",
argv[0], cwd, buf);
++errors;
}
if (fd >= 0)
unlink("doesExist");
for (i = 0; i < (int) (sizeof (symlinks) / sizeof (symlinks[0])); ++i)
unlink (symlinks[i].name);
if (errors != 0)
{
printf ("%d errors.\n", errors);
return EXIT_FAILURE;
}
puts ("No errors.");
return EXIT_SUCCESS;
}
static int nilfs_cleaner_find_fs(struct nilfs_cleaner *cleaner,
const char *device, const char *mntdir)
{
struct mntent *mntent, mntbuf;
char buf[LINE_MAX];
char canonical[PATH_MAX + 2];
char *cdev = NULL, *cdir = NULL;
char *mdir, *mdev;
char *last_match_dev = NULL, *last_match_dir = NULL;
pid_t last_match_pid = 0;
FILE *fp = NULL;
int ret = -1, nfound = 0;
if (device && myrealpath(device, canonical, sizeof(canonical))) {
cdev = strdup(canonical);
if (!cdev)
goto error;
cleaner->device = cdev;
}
if (mntdir && myrealpath(mntdir, canonical, sizeof(canonical))) {
cdir = strdup(canonical);
if (!cdir)
goto error;
cleaner->mountdir = cdir;
}
fp = fopen(MTAB, "r");
if (fp == NULL) {
nilfs_cleaner_logger(LOG_ERR, _("Error: cannot open " MTAB
"."));
goto abort;
}
while ((mntent = getmntent_r(fp, &mntbuf, buf, sizeof(buf))) != NULL) {
if (strcmp(mntent->mnt_type, MNTTYPE_NILFS) != 0)
continue;
if (cleaner->mountdir != NULL) {
mdir = mntent->mnt_dir;
if (myrealpath(mdir, canonical, sizeof(canonical)))
mdir = canonical;
if (strcmp(mdir, cleaner->mountdir) != 0)
continue;
}
if (cleaner->device != NULL) {
mdev = mntent->mnt_fsname;
if (myrealpath(mdev, canonical, sizeof(canonical)))
mdev = canonical;
if (strcmp(mdev, cleaner->device) != 0)
continue;
}
if (hasmntopt(mntent, MNTOPT_RW)) {
/* we found a candidate */
nfound++;
if (cleaner->device == NULL) {
mdev = mntent->mnt_fsname;
if (myrealpath(mdev, canonical,
sizeof(canonical))) {
mdev = canonical;
}
if (last_match_dev)
free(last_match_dev);
last_match_dev = strdup(mdev);
if (!last_match_dev)
goto error;
}
if (cleaner->mountdir == NULL) {
mdir = mntent->mnt_dir;
if (myrealpath(mdir, canonical,
sizeof(canonical))) {
mdir = canonical;
}
if (last_match_dir)
free(last_match_dir);
last_match_dir = strdup(mdir);
if (!last_match_dir)
goto error;
}
last_match_pid = 0;
ret = nilfs_find_gcpid_opt(mntent->mnt_opts,
&last_match_pid);
if (ret < 0)
goto error;
}
}
if (nfound == 0) {
nilfs_cleaner_logger(LOG_ERR,
_("Error: no valid nilfs mountpoint "
"found."));
goto abort;
}
if (last_match_dir)
cleaner->mountdir = last_match_dir;
if (last_match_dev)
cleaner->device = last_match_dev;
if (last_match_pid)
cleaner->cleanerd_pid = last_match_pid;
endmntent(fp);
return 0;
error:
nilfs_cleaner_logger(LOG_ERR, _("Error: failed to find fs: %s."),
strerror(errno));
abort:
free(last_match_dir); /* free(NULL) is just ignored */
free(last_match_dev);
if (fp)
endmntent(fp);
return -1;
}
