/*
* Signal that we are now inside a directory pointed to by dir_fd.
* The caller can't tell if this is the first time this happens, so
* we have to be careful not to call dup() more than once
*/
static void
inside_dir (int dir_fd)
{
if (ftsoptions & FTS_CWDFD)
{
assert (dir_fd == AT_FDCWD || dir_fd >= 0);
state.cwd_dir_fd = dir_fd;
if (curr_fd < 0)
{
if (AT_FDCWD == dir_fd)
{
curr_fd = AT_FDCWD;
}
else if (dir_fd >= 0)
{
curr_fd = dup_cloexec (dir_fd);
}
else
{
/* curr_fd is invalid, but dir_fd is also invalid.
* This should not have happened.
*/
assert (curr_fd >= 0 || dir_fd >= 0);
}
}
}
else
{
/* FTS_CWDFD is not in use. We can always assume that
* AT_FDCWD refers to the directory we are currentl searching.
*
* Therefore there is nothing to do.
*/
}
}
int
main (void)
{
const char *file = "test-dup2.tmp";
char buffer[1];
int fd = open (file, O_CREAT | O_TRUNC | O_RDWR, 0600);
/* Assume std descriptors were provided by invoker. */
ASSERT (STDERR_FILENO < fd);
ASSERT (is_open (fd));
/* Ignore any other fd's leaked into this process. */
close (fd + 1);
close (fd + 2);
ASSERT (!is_open (fd + 1));
ASSERT (!is_open (fd + 2));
/* Assigning to self must be a no-op. */
ASSERT (dup2 (fd, fd) == fd);
ASSERT (is_open (fd));
/* The source must be valid. */
errno = 0;
ASSERT (dup2 (-1, fd) == -1);
ASSERT (errno == EBADF);
errno = 0;
ASSERT (dup2 (99, fd) == -1);
ASSERT (errno == EBADF);
errno = 0;
ASSERT (dup2 (AT_FDCWD, fd) == -1);
ASSERT (errno == EBADF);
ASSERT (is_open (fd));
/* If the source is not open, then the destination is unaffected. */
errno = 0;
ASSERT (dup2 (fd + 1, fd + 1) == -1);
ASSERT (errno == EBADF);
ASSERT (!is_open (fd + 1));
errno = 0;
ASSERT (dup2 (fd + 1, fd) == -1);
ASSERT (errno == EBADF);
ASSERT (is_open (fd));
/* The destination must be valid. */
errno = 0;
ASSERT (dup2 (fd, -2) == -1);
ASSERT (errno == EBADF);
errno = 0;
ASSERT (dup2 (fd, 10000000) == -1);
ASSERT (errno == EBADF);
/* Using dup2 can skip fds. */
ASSERT (dup2 (fd, fd + 2) == fd + 2);
ASSERT (is_open (fd));
ASSERT (!is_open (fd + 1));
ASSERT (is_open (fd + 2));
/* Verify that dup2 closes the previous occupant of a fd. */
ASSERT (open ("/dev/null", O_WRONLY, 0600) == fd + 1);
ASSERT (dup2 (fd + 1, fd) == fd);
ASSERT (close (fd + 1) == 0);
ASSERT (write (fd, "1", 1) == 1);
ASSERT (dup2 (fd + 2, fd) == fd);
ASSERT (lseek (fd, 0, SEEK_END) == 0);
ASSERT (write (fd + 2, "2", 1) == 1);
ASSERT (lseek (fd, 0, SEEK_SET) == 0);
ASSERT (read (fd, buffer, 1) == 1);
ASSERT (*buffer == '2');
#if GNULIB_TEST_CLOEXEC
/* Any new fd created by dup2 must not be cloexec. */
ASSERT (close (fd + 2) == 0);
ASSERT (dup_cloexec (fd) == fd + 1);
ASSERT (!is_inheritable (fd + 1));
ASSERT (dup2 (fd + 1, fd + 1) == fd + 1);
ASSERT (!is_inheritable (fd + 1));
ASSERT (dup2 (fd + 1, fd + 2) == fd + 2);
ASSERT (!is_inheritable (fd + 1));
ASSERT (is_inheritable (fd + 2));
errno = 0;
ASSERT (dup2 (fd + 1, -1) == -1);
ASSERT (errno == EBADF);
ASSERT (!is_inheritable (fd + 1));
#endif
/* On systems that distinguish between text and binary mode, dup2
reuses the mode of the source. */
setmode (fd, O_BINARY);
ASSERT (is_mode (fd, O_BINARY));
ASSERT (dup2 (fd, fd + 1) == fd + 1);
ASSERT (is_mode (fd + 1, O_BINARY));
setmode (fd, O_TEXT);
ASSERT (is_mode (fd, O_TEXT));
ASSERT (dup2 (fd, fd + 1) == fd + 1);
ASSERT (is_mode (fd + 1, O_TEXT));
/* Clean up. */
ASSERT (close (fd + 2) == 0);
ASSERT (close (fd + 1) == 0);
ASSERT (close (fd) == 0);
ASSERT (unlink (file) == 0);
return 0;
}
/* 'fd_cwd' is a file descriptor pointing to an open directory.
* 'name' is the path element to search for. 'is_end' is a flag
* indicating if this is the last path element.
*
* We search the directory looking for a path element that case
* insensitively matches 'name', returning the actual name in '*name_ret'.
*
* If this is successful, return 0. If it fails, reply with an error
* and return -1.
*/
static int
find_path_element (int fd_cwd, int is_end, const char *name, char **name_ret)
{
int fd2;
DIR *dir;
struct dirent *d;
fd2 = dup_cloexec (fd_cwd); /* because closedir will close it */
if (fd2 == -1) {
reply_with_perror ("dup");
return -1;
}
dir = fdopendir (fd2);
if (dir == NULL) {
reply_with_perror ("opendir");
close (fd2);
return -1;
}
for (;;) {
errno = 0;
d = readdir (dir);
if (d == NULL)
break;
if (STRCASEEQ (d->d_name, name))
break;
}
if (d == NULL && errno != 0) {
reply_with_perror ("readdir");
closedir (dir);
return -1;
}
if (d == NULL && is_end) {
/* Last path element: return it as-is, assuming that the user will
* create a new file or directory (RHBZ#840115).
*/
closedir (dir);
*name_ret = strdup (name);
if (*name_ret == NULL) {
reply_with_perror ("strdup");
return -1;
}
return 0;
}
if (d == NULL) {
reply_with_error ("%s: no file or directory found with this name", name);
closedir (dir);
return -1;
}
*name_ret = strdup (d->d_name);
if (*name_ret == NULL) {
reply_with_perror ("strdup");
closedir (dir);
return -1;
}
/* NB: closedir frees the structure associated with 'd', so we must
* do this last.
*/
if (closedir (dir) == -1) {
reply_with_perror ("closedir");
return -1;
}
return 0;
}
int
main (void)
{
const char *file = "test-cloexec.tmp";
int fd = creat (file, 0600);
int fd2;
/* Assume std descriptors were provided by invoker. */
ASSERT (STDERR_FILENO < fd);
ASSERT (is_inheritable (fd));
/* Normal use of set_cloexec_flag. */
ASSERT (set_cloexec_flag (fd, true) == 0);
#if !((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__)
ASSERT (!is_inheritable (fd));
#endif
ASSERT (set_cloexec_flag (fd, false) == 0);
ASSERT (is_inheritable (fd));
/* Normal use of dup_cloexec. */
fd2 = dup_cloexec (fd);
ASSERT (fd < fd2);
ASSERT (!is_inheritable (fd2));
ASSERT (close (fd) == 0);
ASSERT (dup_cloexec (fd2) == fd);
ASSERT (!is_inheritable (fd));
ASSERT (close (fd2) == 0);
/* On systems that distinguish between text and binary mode,
dup_cloexec reuses the mode of the source. */
setmode (fd, O_BINARY);
ASSERT (is_mode (fd, O_BINARY));
fd2 = dup_cloexec (fd);
ASSERT (fd < fd2);
ASSERT (is_mode (fd2, O_BINARY));
ASSERT (close (fd2) == 0);
setmode (fd, O_TEXT);
ASSERT (is_mode (fd, O_TEXT));
fd2 = dup_cloexec (fd);
ASSERT (fd < fd2);
ASSERT (is_mode (fd2, O_TEXT));
ASSERT (close (fd2) == 0);
/* Test error handling. */
errno = 0;
ASSERT (set_cloexec_flag (-1, false) == -1);
ASSERT (errno == EBADF);
errno = 0;
ASSERT (set_cloexec_flag (10000000, false) == -1);
ASSERT (errno == EBADF);
errno = 0;
ASSERT (set_cloexec_flag (fd2, false) == -1);
ASSERT (errno == EBADF);
errno = 0;
ASSERT (dup_cloexec (-1) == -1);
ASSERT (errno == EBADF);
errno = 0;
ASSERT (dup_cloexec (10000000) == -1);
ASSERT (errno == EBADF);
errno = 0;
ASSERT (dup_cloexec (fd2) == -1);
ASSERT (errno == EBADF);
/* Clean up. */
ASSERT (close (fd) == 0);
ASSERT (unlink (file) == 0);
return 0;
}
int
main (void)
{
int i;
int fd;
/* We close fd 2 later, so save it in fd 10. */
if (dup2 (STDERR_FILENO, BACKUP_STDERR_FILENO) != BACKUP_STDERR_FILENO
|| (myerr = fdopen (BACKUP_STDERR_FILENO, "w")) == NULL)
return 2;
/* Create file for later checks. */
fd = creat (witness, 0600);
ASSERT (STDERR_FILENO < fd);
/* Four iterations, with progressively more standard descriptors
closed. */
for (i = -1; i <= STDERR_FILENO; i++)
{
if (0 <= i)
ASSERT (close (i) == 0);
/* Detect errors. */
errno = 0;
ASSERT (dup (-1) == -1);
ASSERT (errno == EBADF);
errno = 0;
ASSERT (dup (10000000) == -1);
ASSERT (errno == EBADF);
close (fd + 1);
errno = 0;
ASSERT (dup (fd + 1) == -1);
ASSERT (errno == EBADF);
/* Preserve text vs. binary. */
setmode (fd, O_BINARY);
ASSERT (dup (fd) == fd + 1);
ASSERT (is_open (fd + 1));
ASSERT (is_inheritable (fd + 1));
ASSERT (is_mode (fd + 1, O_BINARY));
ASSERT (close (fd + 1) == 0);
setmode (fd, O_TEXT);
ASSERT (dup (fd) == fd + 1);
ASSERT (is_open (fd + 1));
ASSERT (is_inheritable (fd + 1));
ASSERT (is_mode (fd + 1, O_TEXT));
/* Create cloexec copy. */
ASSERT (close (fd + 1) == 0);
ASSERT (fd_safer_flag (dup_cloexec (fd), O_CLOEXEC) == fd + 1);
ASSERT (set_cloexec_flag (fd + 1, true) == 0);
ASSERT (is_open (fd + 1));
ASSERT (!is_inheritable (fd + 1));
ASSERT (close (fd) == 0);
/* dup always creates inheritable copies. Also, check that
earliest slot past std fds is used. */
ASSERT (dup (fd + 1) == fd);
ASSERT (is_open (fd));
ASSERT (is_inheritable (fd));
ASSERT (close (fd + 1) == 0);
}
/* Cleanup. */
ASSERT (close (fd) == 0);
ASSERT (unlink (witness) == 0);
return 0;
}
static void run_helper(libxl__egc *egc, libxl__save_helper_state *shs,
const char *mode_arg,
int stream_fd, int back_channel_fd,
const int *preserve_fds, int num_preserve_fds,
const unsigned long *argnums, int num_argnums)
{
STATE_AO_GC(shs->ao);
const char *args[HELPER_NR_ARGS + num_argnums];
const char **arg = args;
int i, rc;
/* Resources we must free */
libxl__carefd *childs_pipes[2] = { 0,0 };
/* Convenience aliases */
const uint32_t domid = shs->domid;
shs->rc = 0;
shs->completed = 0;
shs->pipes[0] = shs->pipes[1] = 0;
libxl__save_helper_init(shs);
shs->abrt.ao = shs->ao;
shs->abrt.callback = helper_stop;
rc = libxl__ao_abortable_register(&shs->abrt);
if (rc) goto out;
shs->stdin_what = GCSPRINTF("domain %"PRIu32" save/restore helper"
" stdin pipe", domid);
shs->stdout_what = GCSPRINTF("domain %"PRIu32" save/restore helper"
" stdout pipe", domid);
*arg++ = getenv("LIBXL_SAVE_HELPER") ?: LIBEXEC_BIN "/" "libxl-save-helper";
*arg++ = mode_arg;
const char **stream_fd_arg = arg++;
const char **back_channel_fd_arg = arg++;
for (i=0; i<num_argnums; i++)
*arg++ = GCSPRINTF("%lu", argnums[i]);
*arg++ = 0;
assert(arg == args + ARRAY_SIZE(args));
libxl__carefd_begin();
int childfd;
for (childfd=0; childfd<2; childfd++) {
/* Setting up the pipe for the child's fd childfd */
int fds[2];
if (libxl_pipe(CTX,fds)) {
rc = ERROR_FAIL;
libxl__carefd_unlock();
goto out;
}
int childs_end = childfd==0 ? 0 /*read*/ : 1 /*write*/;
int our_end = childfd==0 ? 1 /*write*/ : 0 /*read*/;
childs_pipes[childfd] = libxl__carefd_record(CTX, fds[childs_end]);
shs->pipes[childfd] = libxl__carefd_record(CTX, fds[our_end]);
}
libxl__carefd_unlock();
pid_t pid = libxl__ev_child_fork(gc, &shs->child, helper_exited);
if (!pid) {
stream_fd = dup_cloexec(gc, stream_fd, "migration stream fd");
*stream_fd_arg = GCSPRINTF("%d", stream_fd);
if (back_channel_fd >= 0)
back_channel_fd = dup_cloexec(gc, back_channel_fd,
"migration back channel fd");
*back_channel_fd_arg = GCSPRINTF("%d", back_channel_fd);
for (i=0; i<num_preserve_fds; i++)
if (preserve_fds[i] >= 0) {
assert(preserve_fds[i] > 2);
libxl_fd_set_cloexec(CTX, preserve_fds[i], 0);
}
libxl__exec(gc,
libxl__carefd_fd(childs_pipes[0]),
libxl__carefd_fd(childs_pipes[1]),
-1,
args[0], (char**)args, 0);
}
libxl__carefd_close(childs_pipes[0]);
libxl__carefd_close(childs_pipes[1]);
rc = libxl__ev_fd_register(gc, &shs->readable, helper_stdout_readable,
libxl__carefd_fd(shs->pipes[1]), POLLIN|POLLPRI);
if (rc) goto out;
return;
out:
libxl__carefd_close(childs_pipes[0]);
libxl__carefd_close(childs_pipes[1]);
helper_failed(egc, shs, rc);;
}