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fhandler_socket_local.cc
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fhandler_socket_local.cc
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/* fhandler_socket_local.cc.
See fhandler.h for a description of the fhandler classes.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#define __INSIDE_CYGWIN_NET__
#define USE_SYS_TYPES_FD_SET
#include "winsup.h"
#ifdef __x86_64__
/* 2014-04-24: Current Mingw headers define sockaddr_in6 using u_long (8 byte)
because a redefinition for LP64 systems is missing. This leads to a wrong
definition and size of sockaddr_in6 when building with winsock headers.
This definition is also required to use the right u_long type in subsequent
function calls. */
#undef u_long
#define u_long __ms_u_long
#endif
#include "ntsecapi.h"
#include <w32api/ws2tcpip.h>
#include <w32api/mswsock.h>
#include <unistd.h>
#include <asm/byteorder.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/param.h>
#include <sys/statvfs.h>
#include <cygwin/acl.h>
#include "cygerrno.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "wininfo.h"
#include "ntdll.h"
extern "C" {
int sscanf (const char *, const char *, ...);
} /* End of "C" section */
#define ASYNC_MASK (FD_READ|FD_WRITE|FD_OOB|FD_ACCEPT|FD_CONNECT)
#define EVENT_MASK (FD_READ|FD_WRITE|FD_OOB|FD_ACCEPT|FD_CONNECT|FD_CLOSE)
#define LOCK_EVENTS \
if (wsock_mtx && \
WaitForSingleObject (wsock_mtx, INFINITE) != WAIT_FAILED) \
{
#define UNLOCK_EVENTS \
ReleaseMutex (wsock_mtx); \
}
static inline mode_t
adjust_socket_file_mode (mode_t mode)
{
/* Kludge: Don't allow to remove read bit on socket files for
user/group/other, if the accompanying write bit is set. It would
be nice to have exact permissions on a socket file, but it's
necessary that somebody able to access the socket can always read
the contents of the socket file to avoid spurious "permission
denied" messages. */
return mode | ((mode & (S_IWUSR | S_IWGRP | S_IWOTH)) << 1);
}
/* cygwin internal: map sockaddr into internet domain address */
int
get_inet_addr_local (const struct sockaddr *in, int inlen,
struct sockaddr_storage *out, int *outlen,
int *type = NULL, int *secret = NULL)
{
int secret_buf [4];
int* secret_ptr = (secret ? : secret_buf);
/* Check for abstract socket. These are generated for AF_LOCAL datagram
sockets in recv_internal, to allow a datagram server to use sendto
after recvfrom. */
if (inlen >= (int) sizeof (in->sa_family) + 7
&& in->sa_data[0] == '\0' && in->sa_data[1] == 'd'
&& in->sa_data[6] == '\0')
{
struct sockaddr_in addr;
addr.sin_family = AF_INET;
sscanf (in->sa_data + 2, "%04hx", &addr.sin_port);
addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
*outlen = sizeof addr;
memcpy (out, &addr, *outlen);
return 0;
}
path_conv pc (in->sa_data, PC_SYM_FOLLOW);
if (pc.error)
{
set_errno (pc.error);
return SOCKET_ERROR;
}
if (!pc.exists ())
{
set_errno (ENOENT);
return SOCKET_ERROR;
}
/* Do NOT test for the file being a socket file here. The socket file
creation is not an atomic operation, so there is a chance that socket
files which are just in the process of being created are recognized
as non-socket files. To work around this problem we now create the
file with all sharing disabled. If the below NtOpenFile fails
with STATUS_SHARING_VIOLATION we know that the file already exists,
but the creating process isn't finished yet. So we yield and try
again, until we can either open the file successfully, or some error
other than STATUS_SHARING_VIOLATION occurs.
Since we now don't know if the file is actually a socket file, we
perform this check here explicitely. */
NTSTATUS status;
HANDLE fh;
OBJECT_ATTRIBUTES attr;
IO_STATUS_BLOCK io;
pc.get_object_attr (attr, sec_none_nih);
do
{
status = NtOpenFile (&fh, GENERIC_READ | SYNCHRONIZE, &attr, &io,
FILE_SHARE_VALID_FLAGS,
FILE_SYNCHRONOUS_IO_NONALERT
| FILE_OPEN_FOR_BACKUP_INTENT
| FILE_NON_DIRECTORY_FILE);
if (status == STATUS_SHARING_VIOLATION)
{
/* While we hope that the sharing violation is only temporary, we
also could easily get stuck here, waiting for a file in use by
some greedy Win32 application. Therefore we should never wait
endlessly without checking for signals and thread cancel event. */
pthread_testcancel ();
if (cygwait (NULL, cw_nowait, cw_sig_eintr) == WAIT_SIGNALED
&& !_my_tls.call_signal_handler ())
{
set_errno (EINTR);
return SOCKET_ERROR;
}
yield ();
}
else if (!NT_SUCCESS (status))
{
__seterrno_from_nt_status (status);
return SOCKET_ERROR;
}
}
while (status == STATUS_SHARING_VIOLATION);
/* Now test for the SYSTEM bit. */
FILE_BASIC_INFORMATION fbi;
status = NtQueryInformationFile (fh, &io, &fbi, sizeof fbi,
FileBasicInformation);
if (!NT_SUCCESS (status))
{
__seterrno_from_nt_status (status);
return SOCKET_ERROR;
}
if (!(fbi.FileAttributes & FILE_ATTRIBUTE_SYSTEM))
{
NtClose (fh);
set_errno (EBADF);
return SOCKET_ERROR;
}
/* Eventually check the content and fetch the required information. */
char buf[128];
memset (buf, 0, sizeof buf);
status = NtReadFile (fh, NULL, NULL, NULL, &io, buf, 128, NULL, NULL);
NtClose (fh);
if (NT_SUCCESS (status))
{
struct sockaddr_in sin;
char ctype;
sin.sin_family = AF_INET;
if (strncmp (buf, SOCKET_COOKIE, strlen (SOCKET_COOKIE)))
{
set_errno (EBADF);
return SOCKET_ERROR;
}
sscanf (buf + strlen (SOCKET_COOKIE), "%hu %c %08x-%08x-%08x-%08x",
&sin.sin_port,
&ctype,
secret_ptr, secret_ptr + 1, secret_ptr + 2, secret_ptr + 3);
sin.sin_port = htons (sin.sin_port);
sin.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
memcpy (out, &sin, sizeof sin);
*outlen = sizeof sin;
if (type)
*type = (ctype == 's' ? SOCK_STREAM :
ctype == 'd' ? SOCK_DGRAM
: 0);
return 0;
}
__seterrno_from_nt_status (status);
return SOCKET_ERROR;
}
/* There's no DLL which exports the symbol WSARecvMsg. One has to call
WSAIoctl as below to fetch the function pointer. Why on earth did the
MS developers decide not to export a normal symbol for these extension
functions? */
inline int
get_ext_funcptr (SOCKET sock, void *funcptr)
{
DWORD bret;
const GUID guid = WSAID_WSARECVMSG;
return WSAIoctl (sock, SIO_GET_EXTENSION_FUNCTION_POINTER,
(void *) &guid, sizeof (GUID), funcptr, sizeof (void *),
&bret, NULL, NULL);
}
fhandler_socket_local::fhandler_socket_local () :
fhandler_socket_wsock (),
sun_path (NULL),
peer_sun_path (NULL),
status ()
{
}
fhandler_socket_local::~fhandler_socket_local ()
{
if (sun_path)
cfree (sun_path);
if (peer_sun_path)
cfree (peer_sun_path);
}
int
fhandler_socket_local::socket (int af, int type, int protocol, int flags)
{
SOCKET sock;
int ret;
if (type != SOCK_STREAM && type != SOCK_DGRAM)
{
set_errno (EINVAL);
return -1;
}
if (protocol != 0)
{
set_errno (EPROTONOSUPPORT);
return -1;
}
sock = ::socket (AF_INET, type, protocol);
if (sock == INVALID_SOCKET)
{
set_winsock_errno ();
return -1;
}
ret = set_socket_handle (sock, af, type, flags);
if (ret < 0)
::closesocket (sock);
return ret;
}
int
fhandler_socket_local::socketpair (int af, int type, int protocol, int flags,
fhandler_socket *_fh_out)
{
SOCKET insock = INVALID_SOCKET;
SOCKET outsock = INVALID_SOCKET;
SOCKET sock = INVALID_SOCKET;
struct sockaddr_in sock_in, sock_out;
int len;
fhandler_socket_local *fh_out = reinterpret_cast<fhandler_socket_local *>
(_fh_out);
if (type != SOCK_STREAM && type != SOCK_DGRAM)
{
set_errno (EINVAL);
return -1;
}
if (protocol != 0)
{
set_errno (EPROTONOSUPPORT);
return -1;
}
/* create listening socket */
sock = ::socket (AF_INET, type, 0);
if (sock == INVALID_SOCKET)
{
set_winsock_errno ();
goto err;
}
/* bind to unused port */
sock_in.sin_family = AF_INET;
sock_in.sin_port = 0;
sock_in.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
if (::bind (sock, (struct sockaddr *) &sock_in, sizeof (sock_in)) < 0)
{
set_winsock_errno ();
goto err;
}
/* fetch socket name */
len = sizeof (sock_in);
if (::getsockname (sock, (struct sockaddr *) &sock_in, &len) < 0)
{
set_winsock_errno ();
goto err;
}
/* on stream sockets, create listener */
if (type == SOCK_STREAM && ::listen (sock, 2) < 0)
{
set_winsock_errno ();
goto err;
}
/* create connecting socket */
outsock = ::socket (AF_INET, type, 0);
if (outsock == INVALID_SOCKET)
{
set_winsock_errno ();
goto err;
}
/* on datagram sockets, bind connecting socket */
if (type == SOCK_DGRAM)
{
sock_out.sin_family = AF_INET;
sock_out.sin_port = 0;
sock_out.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
if (::bind (outsock, (struct sockaddr *) &sock_out,
sizeof (sock_out)) < 0)
{
set_winsock_errno ();
goto err;
}
/* ...and fetch name */
len = sizeof (sock_out);
if (::getsockname (outsock, (struct sockaddr *) &sock_out, &len) < 0)
{
set_winsock_errno ();
goto err;
}
}
sock_in.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
if (type == SOCK_DGRAM)
sock_out.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
/* connect */
if (::connect (outsock, (struct sockaddr *) &sock_in, sizeof (sock_in)) < 0)
{
set_winsock_errno ();
goto err;
}
if (type == SOCK_STREAM)
{
/* on stream sockets, accept connection and close listener */
len = sizeof (sock_in);
insock = ::accept (sock, (struct sockaddr *) &sock_in, &len);
if (insock == INVALID_SOCKET)
{
set_winsock_errno ();
goto err;
}
::closesocket (sock);
}
else
{
/* on datagram sockets, connect vice versa */
if (::connect (sock, (struct sockaddr *) &sock_out,
sizeof (sock_out)) < 0)
{
set_winsock_errno ();
goto err;
}
insock = sock;
}
sock = INVALID_SOCKET;
/* postprocessing */
connect_state (connected);
fh_out->connect_state (connected);
if (af == AF_LOCAL && type == SOCK_STREAM)
{
af_local_set_sockpair_cred ();
fh_out->af_local_set_sockpair_cred ();
}
if (set_socket_handle (insock, af, type, flags) < 0
|| fh_out->set_socket_handle (outsock, af, type, flags) < 0)
goto err;
return 0;
err:
if (sock != INVALID_SOCKET)
::closesocket (sock);
if (insock != INVALID_SOCKET)
::closesocket (insock);
if (outsock != INVALID_SOCKET)
::closesocket (outsock);
return -1;
}
void
fhandler_socket_local::af_local_set_sockpair_cred ()
{
sec_pid = sec_peer_pid = getpid ();
sec_uid = sec_peer_uid = geteuid32 ();
sec_gid = sec_peer_gid = getegid32 ();
}
void
fhandler_socket_local::af_local_setblocking (bool &async, bool &nonblocking)
{
async = async_io ();
nonblocking = is_nonblocking ();
if (async)
{
WSAAsyncSelect (get_socket (), winmsg, 0, 0);
WSAEventSelect (get_socket (), wsock_evt, EVENT_MASK);
}
set_nonblocking (false);
async_io (false);
}
void
fhandler_socket_local::af_local_unsetblocking (bool async, bool nonblocking)
{
if (nonblocking)
set_nonblocking (true);
if (async)
{
WSAAsyncSelect (get_socket (), winmsg, WM_ASYNCIO, ASYNC_MASK);
async_io (true);
}
}
bool
fhandler_socket_local::af_local_recv_secret ()
{
int out[4] = { 0, 0, 0, 0 };
int rest = sizeof out;
char *ptr = (char *) out;
while (rest > 0)
{
int ret = recvfrom (ptr, rest, 0, NULL, NULL);
if (ret <= 0)
break;
rest -= ret;
ptr += ret;
}
if (rest == 0)
{
debug_printf ("Received af_local secret: %08x-%08x-%08x-%08x",
out[0], out[1], out[2], out[3]);
if (out[0] != connect_secret[0] || out[1] != connect_secret[1]
|| out[2] != connect_secret[2] || out[3] != connect_secret[3])
{
debug_printf ("Receiving af_local secret mismatch");
return false;
}
}
else
debug_printf ("Receiving af_local secret failed");
return rest == 0;
}
bool
fhandler_socket_local::af_local_send_secret ()
{
int rest = sizeof connect_secret;
char *ptr = (char *) connect_secret;
while (rest > 0)
{
int ret = sendto (ptr, rest, 0, NULL, 0);
if (ret <= 0)
break;
rest -= ret;
ptr += ret;
}
debug_printf ("Sending af_local secret %s", rest == 0 ? "succeeded"
: "failed");
return rest == 0;
}
bool
fhandler_socket_local::af_local_recv_cred ()
{
struct ucred out = { (pid_t) 0, (uid_t) -1, (gid_t) -1 };
int rest = sizeof out;
char *ptr = (char *) &out;
while (rest > 0)
{
int ret = recvfrom (ptr, rest, 0, NULL, NULL);
if (ret <= 0)
break;
rest -= ret;
ptr += ret;
}
if (rest == 0)
{
debug_printf ("Received eid credentials: pid: %d, uid: %d, gid: %d",
out.pid, out.uid, out.gid);
sec_peer_pid = out.pid;
sec_peer_uid = out.uid;
sec_peer_gid = out.gid;
}
else
debug_printf ("Receiving eid credentials failed");
return rest == 0;
}
bool
fhandler_socket_local::af_local_send_cred ()
{
struct ucred in = { sec_pid, sec_uid, sec_gid };
int rest = sizeof in;
char *ptr = (char *) ∈
while (rest > 0)
{
int ret = sendto (ptr, rest, 0, NULL, 0);
if (ret <= 0)
break;
rest -= ret;
ptr += ret;
}
if (rest == 0)
debug_printf ("Sending eid credentials succeeded");
else
debug_printf ("Sending eid credentials failed");
return rest == 0;
}
int
fhandler_socket_local::af_local_connect ()
{
bool orig_async_io, orig_is_nonblocking;
if (get_socket_type () != SOCK_STREAM)
return 0;
debug_printf ("af_local_connect called, no_getpeereid=%d", no_getpeereid ());
if (no_getpeereid ())
return 0;
af_local_setblocking (orig_async_io, orig_is_nonblocking);
if (!af_local_send_secret () || !af_local_recv_secret ()
|| !af_local_send_cred () || !af_local_recv_cred ())
{
debug_printf ("accept from unauthorized server");
::shutdown (get_socket (), SD_BOTH);
WSASetLastError (WSAECONNREFUSED);
return -1;
}
af_local_unsetblocking (orig_async_io, orig_is_nonblocking);
return 0;
}
int
fhandler_socket_local::af_local_accept ()
{
bool orig_async_io, orig_is_nonblocking;
debug_printf ("af_local_accept called, no_getpeereid=%d", no_getpeereid ());
if (no_getpeereid ())
return 0;
af_local_setblocking (orig_async_io, orig_is_nonblocking);
if (!af_local_recv_secret () || !af_local_send_secret ()
|| !af_local_recv_cred () || !af_local_send_cred ())
{
debug_printf ("connect from unauthorized client");
::shutdown (get_socket (), SD_BOTH);
::closesocket (get_socket ());
WSASetLastError (WSAECONNABORTED);
return -1;
}
af_local_unsetblocking (orig_async_io, orig_is_nonblocking);
return 0;
}
int
fhandler_socket_local::af_local_set_no_getpeereid ()
{
if (get_addr_family () != AF_LOCAL || get_socket_type () != SOCK_STREAM)
{
set_errno (EINVAL);
return -1;
}
if (connect_state () != unconnected)
{
set_errno (EALREADY);
return -1;
}
debug_printf ("no_getpeereid set");
no_getpeereid (true);
return 0;
}
void
fhandler_socket_local::af_local_set_cred ()
{
sec_pid = getpid ();
sec_uid = geteuid32 ();
sec_gid = getegid32 ();
sec_peer_pid = (pid_t) 0;
sec_peer_uid = (uid_t) -1;
sec_peer_gid = (gid_t) -1;
}
void
fhandler_socket_local::af_local_copy (fhandler_socket_local *sock)
{
sock->connect_secret[0] = connect_secret[0];
sock->connect_secret[1] = connect_secret[1];
sock->connect_secret[2] = connect_secret[2];
sock->connect_secret[3] = connect_secret[3];
sock->sec_pid = sec_pid;
sock->sec_uid = sec_uid;
sock->sec_gid = sec_gid;
sock->sec_peer_pid = sec_peer_pid;
sock->sec_peer_uid = sec_peer_uid;
sock->sec_peer_gid = sec_peer_gid;
sock->no_getpeereid (no_getpeereid ());
}
void
fhandler_socket_local::af_local_set_secret (char *buf)
{
if (!RtlGenRandom (connect_secret, sizeof (connect_secret)))
bzero ((char*) connect_secret, sizeof (connect_secret));
__small_sprintf (buf, "%08x-%08x-%08x-%08x",
connect_secret [0], connect_secret [1],
connect_secret [2], connect_secret [3]);
}
int
fhandler_socket_local::dup (fhandler_base *child, int flags)
{
if (get_flags () & O_PATH)
/* We're viewing the socket as a disk file, but fhandler_base::dup
suffices here. */
return fhandler_base::dup (child, flags);
fhandler_socket_local *fhs = (fhandler_socket_local *) child;
fhs->set_sun_path (get_sun_path ());
fhs->set_peer_sun_path (get_peer_sun_path ());
return fhandler_socket_wsock::dup (child, flags);
}
int
fhandler_socket_local::open (int flags, mode_t mode)
{
/* We don't support opening sockets unless O_PATH is specified. */
if (flags & O_PATH)
return open_fs (flags, mode);
set_errno (EOPNOTSUPP);
return 0;
}
int
fhandler_socket_local::close ()
{
if (get_flags () & O_PATH)
return fhandler_base::close ();
else
return fhandler_socket_wsock::close ();
}
int
fhandler_socket_local::fcntl (int cmd, intptr_t arg)
{
if (get_flags () & O_PATH)
/* We're viewing the socket as a disk file, but
fhandler_base::fcntl suffices here. */
return fhandler_base::fcntl (cmd, arg);
else
return fhandler_socket_wsock::fcntl (cmd, arg);
}
int __reg2
fhandler_socket_local::fstat (struct stat *buf)
{
if (!dev ().isfs ())
/* fstat called on a socket. */
return fhandler_socket_wsock::fstat (buf);
/* stat/lstat on a socket file or fstat on a socket opened w/ O_PATH. */
int res = fhandler_base::fstat_fs (buf);
if (!res)
{
buf->st_mode = (buf->st_mode & ~S_IFMT) | S_IFSOCK;
buf->st_size = 0;
}
return res;
}
int __reg2
fhandler_socket_local::fstatvfs (struct statvfs *sfs)
{
if (!dev ().isfs ())
/* fstatvfs called on a socket. */
return fhandler_socket_wsock::fstatvfs (sfs);
/* statvfs on a socket file or fstatvfs on a socket opened w/ O_PATH. */
if (get_flags () & O_PATH)
/* We already have a handle. */
{
HANDLE h = get_handle ();
if (h)
return fstatvfs_by_handle (h, sfs);
}
fhandler_disk_file fh (pc);
fh.get_device () = FH_FS;
return fh.fstatvfs (sfs);
}
int
fhandler_socket_local::fchmod (mode_t newmode)
{
if (!dev ().isfs ())
/* fchmod called on a socket. */
return fhandler_socket_wsock::fchmod (newmode);
/* chmod on a socket file. [We won't get here if fchmod is called
on a socket opened w/ O_PATH.] */
fhandler_disk_file fh (pc);
fh.get_device () = FH_FS;
return fh.fchmod (S_IFSOCK | adjust_socket_file_mode (newmode));
}
int
fhandler_socket_local::fchown (uid_t uid, gid_t gid)
{
if (!dev ().isfs ())
/* fchown called on a socket. */
return fhandler_socket_wsock::fchown (uid, gid);
/* chown/lchown on a socket file. [We won't get here if fchown is
called on a socket opened w/ O_PATH.] */
fhandler_disk_file fh (pc);
return fh.fchown (uid, gid);
}
int
fhandler_socket_local::facl (int cmd, int nentries, aclent_t *aclbufp)
{
if (!dev ().isfs ())
/* facl called on a socket. */
return fhandler_socket_wsock::facl (cmd, nentries, aclbufp);
/* facl on a socket file. [We won't get here if facl is called on a
socket opened w/ O_PATH.] */
fhandler_disk_file fh (pc);
return fh.facl (cmd, nentries, aclbufp);
}
int
fhandler_socket_local::link (const char *newpath)
{
if (!dev ().isfs ())
/* linkat w/ AT_EMPTY_PATH called on a socket not opened w/ O_PATH. */
return fhandler_socket_wsock::link (newpath);
/* link on a socket file or linkat w/ AT_EMPTY_PATH called on a
socket opened w/ O_PATH. */
fhandler_disk_file fh (pc);
if (get_flags () & O_PATH)
fh.set_handle (get_handle ());
return fh.link (newpath);
}
int
fhandler_socket_local::bind (const struct sockaddr *name, int namelen)
{
int res = -1;
#define un_addr ((struct sockaddr_un *) name)
struct sockaddr_in sin;
int len = namelen - offsetof (struct sockaddr_un, sun_path);
/* Check that name is within bounds. Don't check if the string is
NUL-terminated, because there are projects out there which set
namelen to a value which doesn't cover the trailing NUL. */
if (len <= 1 || (len = strnlen (un_addr->sun_path, len)) > UNIX_PATH_MAX)
{
set_errno (len <= 1 ? (len == 1 ? ENOENT : EINVAL) : ENAMETOOLONG);
return -1;
}
/* Copy over the sun_path string into a buffer big enough to add a
trailing NUL. */
char sun_path[len + 1];
strncpy (sun_path, un_addr->sun_path, len);
sun_path[len] = '\0';
/* This isn't entirely foolproof, but we check first if the file exists
so we can return with EADDRINUSE before having bound the socket.
This allows an application to call bind again on the same socket using
another filename. If we bind first, the application will not be able
to call bind successfully ever again. */
path_conv pc (sun_path, PC_SYM_FOLLOW);
if (pc.error)
{
set_errno (pc.error);
return -1;
}
if (pc.exists ())
{
set_errno (EADDRINUSE);
return -1;
}
sin.sin_family = AF_INET;
sin.sin_port = 0;
sin.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
if (::bind (get_socket (), (sockaddr *) &sin, len = sizeof sin))
{
syscall_printf ("AF_LOCAL: bind failed");
set_winsock_errno ();
return -1;
}
if (::getsockname (get_socket (), (sockaddr *) &sin, &len))
{
syscall_printf ("AF_LOCAL: getsockname failed");
set_winsock_errno ();
return -1;
}
sin.sin_port = ntohs (sin.sin_port);
debug_printf ("AF_LOCAL: socket bound to port %u", sin.sin_port);
mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
DWORD fattr = FILE_ATTRIBUTE_SYSTEM;
if (!pc.has_acls ()
&& !(mode & ~cygheap->umask & (S_IWUSR | S_IWGRP | S_IWOTH)))
fattr |= FILE_ATTRIBUTE_READONLY;
SECURITY_ATTRIBUTES sa = sec_none_nih;
NTSTATUS status;
HANDLE fh;
OBJECT_ATTRIBUTES attr;
IO_STATUS_BLOCK io;
ULONG access = DELETE | FILE_GENERIC_WRITE;
/* If the filesystem supports ACLs, we will overwrite the DACL after the
call to NtCreateFile. This requires a handle with READ_CONTROL and
WRITE_DAC access, otherwise get_file_sd and set_file_sd both have to
open the file again.
FIXME: On remote NTFS shares open sometimes fails because even the
creator of the file doesn't have the right to change the DACL.
I don't know what setting that is or how to recognize such a share,
so for now we don't request WRITE_DAC on remote drives. */
if (pc.has_acls () && !pc.isremote ())
access |= READ_CONTROL | WRITE_DAC | WRITE_OWNER;
status = NtCreateFile (&fh, access, pc.get_object_attr (attr, sa), &io,
NULL, fattr, 0, FILE_CREATE,
FILE_NON_DIRECTORY_FILE
| FILE_SYNCHRONOUS_IO_NONALERT
| FILE_OPEN_FOR_BACKUP_INTENT,
NULL, 0);
if (!NT_SUCCESS (status))
{
if (io.Information == FILE_EXISTS)
set_errno (EADDRINUSE);
else
__seterrno_from_nt_status (status);
}
else
{
if (pc.has_acls ())
set_created_file_access (fh, pc, mode);
char buf[sizeof (SOCKET_COOKIE) + 80];
__small_sprintf (buf, "%s%u %c ", SOCKET_COOKIE, sin.sin_port,
get_socket_type () == SOCK_STREAM ? 's'
: get_socket_type () == SOCK_DGRAM ? 'd' : '-');
af_local_set_secret (strchr (buf, '\0'));
DWORD blen = strlen (buf) + 1;
status = NtWriteFile (fh, NULL, NULL, NULL, &io, buf, blen, NULL, 0);
if (!NT_SUCCESS (status))
{
__seterrno_from_nt_status (status);
FILE_DISPOSITION_INFORMATION fdi = { TRUE };
status = NtSetInformationFile (fh, &io, &fdi, sizeof fdi,
FileDispositionInformation);
if (!NT_SUCCESS (status))
debug_printf ("Setting delete dispostion failed, status = %y",
status);
}
else
{
set_sun_path (sun_path);
res = 0;
}
NtClose (fh);
}
#undef un_addr
return res;
}
int
fhandler_socket_local::connect (const struct sockaddr *name, int namelen)
{
struct sockaddr_storage sst;
int type = 0;
bool reset = (name->sa_family == AF_UNSPEC
&& get_socket_type () == SOCK_DGRAM);
if (reset)
{
if (connect_state () == unconnected)
return 0;
/* To reset a connected DGRAM socket, call Winsock's connect
function with the address member of the sockaddr structure
filled with zeroes. */
memset (&sst, 0, sizeof sst);
sst.ss_family = get_addr_family ();
}
else if (get_inet_addr_local (name, namelen, &sst, &namelen, &type,
connect_secret) == SOCKET_ERROR)
return SOCKET_ERROR;
if (get_socket_type () != type && !reset)
{
WSASetLastError (WSAEPROTOTYPE);
set_winsock_errno ();
return SOCKET_ERROR;
}
if (reset)
set_peer_sun_path (NULL);
else
set_peer_sun_path (name->sa_data);
/* Don't move af_local_set_cred into af_local_connect which may be called
via select, possibly running under another identity. Call early here,
because af_local_connect is called in wait_for_events. */
if (get_socket_type () == SOCK_STREAM)
af_local_set_cred ();
/* Initialize connect state to "connect_pending". In the SOCK_STREAM
case, the state is ultimately set to "connected" or "connect_failed" in
wait_for_events when the FD_CONNECT event occurs. Note that the
underlying OS sockets are always non-blocking in this case and a
successfully initiated non-blocking Winsock connect always returns
WSAEWOULDBLOCK. Thus it's safe to rely on event handling. For DGRAM
sockets, however, connect can return immediately.
Check for either unconnected or connect_failed since in both cases it's
allowed to retry connecting the socket. It's also ok (albeit ugly) to
call connect to check if a previous non-blocking connect finished.
Set connect_state before calling connect, otherwise a race condition with
an already running select or poll might occur. */
if (connect_state () == unconnected || connect_state () == connect_failed)
connect_state (connect_pending);
int res = ::connect (get_socket (), (struct sockaddr *) &sst, namelen);
if (!res)
{
if (reset)
connect_state (unconnected);
else
connect_state (connected);
}
else if (!is_nonblocking ()
&& res == SOCKET_ERROR
&& WSAGetLastError () == WSAEWOULDBLOCK)
res = wait_for_events (FD_CONNECT | FD_CLOSE, 0);
if (res)
{
DWORD err = WSAGetLastError ();
/* Some applications use the ugly technique to check if a non-blocking
connect succeeded by calling connect again, until it returns EISCONN.
This circumvents the event handling and connect_state is never set.
Thus we check for this situation here. */
if (err == WSAEISCONN)
connect_state (connected);
/* Winsock returns WSAEWOULDBLOCK if the non-blocking socket cannot be
conected immediately. Convert to POSIX/Linux compliant EINPROGRESS. */
else if (is_nonblocking () && err == WSAEWOULDBLOCK)
WSASetLastError (WSAEINPROGRESS);
/* Winsock returns WSAEINVAL if the socket is already a listener.
Convert to POSIX/Linux compliant EISCONN. */
else if (err == WSAEINVAL && connect_state () == listener)
WSASetLastError (WSAEISCONN);
/* Any other error except WSAEALREADY means the connect failed. */
else if (connect_state () == connect_pending && err != WSAEALREADY)
connect_state (connect_failed);
set_winsock_errno ();
}
return res;
}
int
fhandler_socket_local::listen (int backlog)
{
int res = ::listen (get_socket (), backlog);
if (res && WSAGetLastError () == WSAEINVAL)
{
/* It's perfectly valid to call listen on an unbound INET socket.
In this case the socket is automatically bound to an unused
port number, listening on all interfaces. On WinSock, listen
fails with WSAEINVAL when it's called on an unbound socket.
So we have to bind manually here to have POSIX semantics. */
if (get_addr_family () == AF_INET)