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Cygwin: AF_UNIX: SCM_RIGHTS: support socket descriptors

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This requires modifying fhandler_socket_wsock::dup and
fhandler_socket_unix::dup to use the src_pid argument.

First cut.  Not yet tested.
This commit is contained in:
Ken Brown 2020-11-20 16:43:30 -05:00
parent 877427fbaa
commit 3b8be197f7
2 changed files with 182 additions and 38 deletions
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37
winsup/cygwin/fhandler_socket_inet.cc
View File

@ -544,52 +544,69 @@ fhandler_socket_wsock::fixup_after_exec ()
}
int
fhandler_socket_wsock::dup (fhandler_base *child, int flags, DWORD)
fhandler_socket_wsock::dup (fhandler_base *child, int flags, DWORD src_pid)
{
debug_printf ("here");
fhandler_socket_wsock *fhs = (fhandler_socket_wsock *) child;
int ret = -1;
HANDLE src_proc = GetCurrentProcess ();
if (!DuplicateHandle (GetCurrentProcess (), wsock_mtx,
if (src_pid && !(src_proc = OpenProcess (PROCESS_DUP_HANDLE, false, src_pid)))
{
debug_printf ("can't open source process %d, %E", src_pid);
__seterrno ();
return -1;
}
if (!DuplicateHandle (src_proc, wsock_mtx,
GetCurrentProcess (), &fhs->wsock_mtx,
0, TRUE, DUPLICATE_SAME_ACCESS))
{
__seterrno ();
return -1;
goto out;
}
if (!DuplicateHandle (GetCurrentProcess (), wsock_evt,
if (!DuplicateHandle (src_proc, wsock_evt,
GetCurrentProcess (), &fhs->wsock_evt,
0, TRUE, DUPLICATE_SAME_ACCESS))
{
__seterrno ();
NtClose (fhs->wsock_mtx);
return -1;
goto out;
}
if (!need_fixup_before ())
{
int ret = fhandler_base::dup (child, flags);
ret = fhandler_base::dup (child, flags, src_pid);
if (ret)
{
NtClose (fhs->wsock_evt);
NtClose (fhs->wsock_mtx);
}
return ret;
goto out;
}
if (src_proc != GetCurrentProcess ())
{
/* FIXME: Can we support this? Is it worth the trouble? */
set_errno (EOPNOTSUPP);
goto out;
}
cygheap->user.deimpersonate ();
fhs->init_fixup_before ();
fhs->set_handle (get_handle ());
int ret = fhs->fixup_before_fork_exec (GetCurrentProcessId ());
ret = fhs->fixup_before_fork_exec (GetCurrentProcessId ());
cygheap->user.reimpersonate ();
if (!ret)
{
fhs->fixup_after_fork (GetCurrentProcess ());
if (fhs->get_handle() != (HANDLE) INVALID_SOCKET)
return 0;
goto out;
}
cygheap->fdtab.dec_need_fixup_before ();
NtClose (fhs->wsock_evt);
NtClose (fhs->wsock_mtx);
return -1;
out:
if (src_proc != GetCurrentProcess ())
NtClose (src_proc);
return ret;
}
int

175
winsup/cygwin/fhandler_socket_unix.cc
View File

@ -1296,43 +1296,56 @@ fhandler_socket_unix::~fhandler_socket_unix ()
}
int
fhandler_socket_unix::dup (fhandler_base *child, int flags, DWORD)
fhandler_socket_unix::dup (fhandler_base *child, int flags, DWORD src_pid)
{
if (fhandler_socket::dup (child, flags))
int ret = -1;
HANDLE src_proc = GetCurrentProcess ();
fhandler_socket_unix *fhs = (fhandler_socket_unix *) child;
if (src_pid && !(src_proc = OpenProcess (PROCESS_DUP_HANDLE, false, src_pid)))
{
debug_printf ("can't open source process %d, %E", src_pid);
__seterrno ();
return -1;
}
fhandler_socket_unix *fhs = (fhandler_socket_unix *) child;
if (get_handle () && fhandler_socket::dup (child, flags, src_pid) < 0)
{
__seterrno ();
goto out;
}
if (backing_file_handle && backing_file_handle != INVALID_HANDLE_VALUE
&& !DuplicateHandle (GetCurrentProcess (), backing_file_handle,
&& !DuplicateHandle (src_proc, backing_file_handle,
GetCurrentProcess (), &fhs->backing_file_handle,
0, TRUE, DUPLICATE_SAME_ACCESS))
{
__seterrno ();
fhs->close ();
return -1;
goto out;
}
if (!DuplicateHandle (GetCurrentProcess (), shmem_handle,
if (!DuplicateHandle (src_proc, shmem_handle,
GetCurrentProcess (), &fhs->shmem_handle,
0, TRUE, DUPLICATE_SAME_ACCESS))
{
__seterrno ();
fhs->close ();
return -1;
goto out;
}
if (fhs->reopen_shmem () < 0)
{
__seterrno ();
fhs->close ();
return -1;
goto out;
}
fhs->sun_path (sun_path ());
fhs->peer_sun_path (peer_sun_path ());
fhs->connect_wait_thr = NULL;
fhs->cwt_termination_evt = NULL;
fhs->cwt_param = NULL;
return 0;
ret = 0;
out:
if (src_proc != GetCurrentProcess ())
NtClose (src_proc);
return ret;
}
/* Waiter thread method. Here we wait for a pipe instance to become
@ -1989,17 +2002,69 @@ fhandler_socket_unix::serialize (int fd)
if (cfd < 0)
{
set_errno (EBADF);
goto out;
return NULL;
}
/* For the moment we support disk files only. */
if (cfd->get_device () != FH_FS)
device dev = cfd->dev ();
switch (dev.get_major ())
{
case DEV_PTYS_MAJOR:
case DEV_PTYM_MAJOR:
case DEV_FLOPPY_MAJOR:
case DEV_CDROM_MAJOR:
case DEV_SD_MAJOR:
case DEV_SD1_MAJOR ... DEV_SD7_MAJOR:
case DEV_SD_HIGHPART_START ... DEV_SD_HIGHPART_END:
case DEV_TAPE_MAJOR:
case DEV_SERIAL_MAJOR:
case DEV_CONS_MAJOR:
set_errno (EOPNOTSUPP);
goto out;
}
default:
switch ((dev_t) dev)
{
case FH_FS:
case FH_INET:
case FH_UNIX:
newfh = cygheap->fdtab.dup_worker (cfd, 0);
if (!newfh)
goto out;
break;
/* The FH_LOCAL case shouldn't occur. */
case FH_LOCAL:
case FH_CONSOLE:
case FH_CONIN:
case FH_CONOUT:
case FH_PTMX:
case FH_WINDOWS:
case FH_FIFO:
case FH_PIPE:
case FH_PIPER:
case FH_PIPEW:
case FH_NULL:
case FH_ZERO:
case FH_FULL:
case FH_RANDOM:
case FH_URANDOM:
case FH_CLIPBOARD:
case FH_OSS_DSP:
case FH_PROC:
case FH_REGISTRY:
case FH_PROCESS:
case FH_PROCESSFD:
case FH_PROCNET:
case FH_PROCSYS:
case FH_PROCSYSVIPC:
case FH_NETDRIVE:
case FH_DEV:
case FH_CYGDRIVE:
case FH_SIGNALFD:
case FH_TIMERFD:
case FH_TTY:
default:
set_errno (EOPNOTSUPP);
goto out;
}
}
/* Free allocated memory in clone. */
newfh->pc.free_strings ();
newfh->dev ().free_strings ();
@ -2028,21 +2093,72 @@ fhandler_socket_unix::deserialize (void *bufp)
fhandler_base *oldfh, *newfh;
DWORD winpid = fhs->winpid;
/* What kind of fhandler is this? */
dev_t dev = ((fhandler_base *) &fhs->fhu)->get_device ();
/* FIXME: Based on dev, we want to cast fhs to the right kind of
fhandler pointer. I guess this requires a big switch statement,
as in dtable.cc:fh_alloc.
For now, we just support disk files. */
if (dev != FH_FS)
/* What kind of fhandler is this? (See dtable.cc:fh_alloc.) */
device dev = ((fhandler_base *) &fhs->fhu)->dev ();
switch (dev.get_major ())
{
case DEV_PTYS_MAJOR:
case DEV_PTYM_MAJOR:
case DEV_FLOPPY_MAJOR:
case DEV_CDROM_MAJOR:
case DEV_SD_MAJOR:
case DEV_SD1_MAJOR ... DEV_SD7_MAJOR:
case DEV_SD_HIGHPART_START ... DEV_SD_HIGHPART_END:
case DEV_TAPE_MAJOR:
case DEV_SERIAL_MAJOR:
case DEV_CONS_MAJOR:
set_errno (EOPNOTSUPP);
send_scm_fd_ack (fhs->uniq_id);
return -1;
default:
switch ((dev_t) dev)
{
case FH_FS:
oldfh = (fhandler_disk_file *) &fhs->fhu;
break;
case FH_INET:
oldfh = (fhandler_socket_inet *) &fhs->fhu;
break;
case FH_UNIX:
oldfh = (fhandler_socket_unix *) &fhs->fhu;
break;
/* The FH_LOCAL case shouldn't occur. */
case FH_LOCAL:
case FH_CONSOLE:
case FH_CONIN:
case FH_CONOUT:
case FH_PTMX:
case FH_WINDOWS:
case FH_FIFO:
case FH_PIPE:
case FH_PIPER:
case FH_PIPEW:
case FH_NULL:
case FH_ZERO:
case FH_FULL:
case FH_RANDOM:
case FH_URANDOM:
case FH_CLIPBOARD:
case FH_OSS_DSP:
case FH_PROC:
case FH_REGISTRY:
case FH_PROCESS:
case FH_PROCESSFD:
case FH_PROCNET:
case FH_PROCSYS:
case FH_PROCSYSVIPC:
case FH_NETDRIVE:
case FH_DEV:
case FH_CYGDRIVE:
case FH_SIGNALFD:
case FH_TIMERFD:
case FH_TTY:
default:
set_errno (EOPNOTSUPP);
send_scm_fd_ack (fhs->uniq_id);
return -1;
}
oldfh = (fhandler_disk_file *) &fhs->fhu;
}
cygheap_fdnew cfd;
if (cfd < 0)
return -1;
@ -2051,7 +2167,18 @@ fhandler_socket_unix::deserialize (void *bufp)
debug_printf ("can't send ack");
if (!newfh)
return -1;
switch ((dev_t) dev)
{
case FH_FS:
newfh->set_name_from_handle ();
break;
case FH_UNIX:
if (((fhandler_socket_unix *) newfh)->get_pipe_end () == pipe_server)
((fhandler_socket_unix *) newfh)->gen_pipe_name ();
break;
default:
break;
}
cfd = newfh;
return cfd;
}