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/* fhandler_socket.cc. See fhandler.h for a description of the fhandler classes.
Copyright 2000, 2001, 2002 Red Hat, Inc.
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 DEBUG_NEST_ON 1 */
#define __INSIDE_CYGWIN_NET__
#include "winsup.h"
#include <errno.h>
#include <sys/socket.h>
#include <asm/byteorder.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#define USE_SYS_TYPES_FD_SET
#include <winsock2.h>
#include "cygerrno.h"
#include "security.h"
#include "cygwin/version.h"
#include "perprocess.h"
#include "fhandler.h"
#include "path.h"
#include "dtable.h"
#include "cygheap.h"
#include "sigproc.h"
#define SECRET_EVENT_NAME "cygwin.local_socket.secret.%d.%08x-%08x-%08x-%08x"
#define ENTROPY_SOURCE_NAME "/dev/urandom"
#define ENTROPY_SOURCE_DEV_UNIT 9
fhandler_dev_random* entropy_source;
/**********************************************************************/
/* fhandler_socket */
fhandler_socket::fhandler_socket ()
: fhandler_base (FH_SOCKET), sun_path (NULL)
{
set_need_fork_fixup ();
prot_info_ptr = (LPWSAPROTOCOL_INFOA) cmalloc (HEAP_BUF,
sizeof (WSAPROTOCOL_INFOA));
}
fhandler_socket::~fhandler_socket ()
{
if (prot_info_ptr)
cfree (prot_info_ptr);
if (sun_path)
cfree (sun_path);
}
void
fhandler_socket::set_connect_secret ()
{
if (!entropy_source)
{
void *buf = malloc (sizeof (fhandler_dev_random));
entropy_source = new (buf) fhandler_dev_random (ENTROPY_SOURCE_DEV_UNIT);
}
if (entropy_source &&
!entropy_source->open (NULL, O_RDONLY))
{
delete entropy_source;
entropy_source = NULL;
}
if (!entropy_source ||
(entropy_source->read (connect_secret, sizeof (connect_secret)) !=
sizeof (connect_secret)))
bzero ((char*) connect_secret, sizeof (connect_secret));
}
void
fhandler_socket::get_connect_secret (char* buf)
{
__small_sprintf (buf, "%08x-%08x-%08x-%08x",
connect_secret [0], connect_secret [1],
connect_secret [2], connect_secret [3]);
}
HANDLE
fhandler_socket::create_secret_event (int* secret)
{
char buf [128];
int* secret_ptr = (secret ? : connect_secret);
struct sockaddr_in sin;
int sin_len = sizeof (sin);
if (getsockname (get_socket (), (struct sockaddr*) &sin, &sin_len))
{
debug_printf ("error getting local socket name (%d)", WSAGetLastError ());
return NULL;
}
__small_sprintf (buf, SECRET_EVENT_NAME, sin.sin_port,
secret_ptr [0], secret_ptr [1],
secret_ptr [2], secret_ptr [3]);
secret_event = CreateEvent (get_inheritance(true), FALSE, FALSE, buf);
if (!secret_event && GetLastError () == ERROR_ALREADY_EXISTS)
secret_event = OpenEvent (EVENT_ALL_ACCESS, FALSE, buf);
if (secret_event)
ProtectHandle (secret_event);
return secret_event;
}
void
fhandler_socket::signal_secret_event ()
{
if (!secret_event)
debug_printf ("no secret event?");
else
{
SetEvent (secret_event);
debug_printf ("signaled secret_event");
}
}
void
fhandler_socket::close_secret_event ()
{
if (secret_event)
ForceCloseHandle (secret_event);
secret_event = NULL;
}
int
fhandler_socket::check_peer_secret_event (struct sockaddr_in* peer, int* secret)
{
char buf [128];
HANDLE ev;
int* secret_ptr = (secret ? : connect_secret);
__small_sprintf (buf, SECRET_EVENT_NAME, peer->sin_port,
secret_ptr [0], secret_ptr [1],
secret_ptr [2], secret_ptr [3]);
ev = CreateEvent (&sec_all_nih, FALSE, FALSE, buf);
if (!ev && GetLastError () == ERROR_ALREADY_EXISTS)
{
debug_printf ("%s event already exist");
ev = OpenEvent (EVENT_ALL_ACCESS, FALSE, buf);
}
signal_secret_event ();
if (ev)
{
DWORD rc = WaitForSingleObject (ev, 10000);
debug_printf ("WFSO rc=%d", rc);
CloseHandle (ev);
return (rc == WAIT_OBJECT_0 ? 1 : 0 );
}
else
return 0;
}
void
fhandler_socket::fixup_before_fork_exec (DWORD win_proc_id)
{
if (!winsock2_active)
{
fhandler_base::fixup_before_fork_exec (win_proc_id);
debug_printf ("Without Winsock 2.0");
}
else if (!WSADuplicateSocketA (get_socket (), win_proc_id, prot_info_ptr))
debug_printf ("WSADuplicateSocket went fine, sock %p, win_proc_id %d, prot_info_ptr %p",
get_socket (), win_proc_id, prot_info_ptr);
else
{
debug_printf ("WSADuplicateSocket error, sock %p, win_proc_id %d, prot_info_ptr %p",
get_socket (), win_proc_id, prot_info_ptr);
set_winsock_errno ();
}
}
extern "C" void __stdcall load_wsock32 ();
void
fhandler_socket::fixup_after_fork (HANDLE parent)
{
SOCKET new_sock;
debug_printf ("WSASocket begin, dwServiceFlags1=%d",
prot_info_ptr->dwServiceFlags1);
if ((new_sock = WSASocketA (FROM_PROTOCOL_INFO,
FROM_PROTOCOL_INFO,
FROM_PROTOCOL_INFO,
prot_info_ptr, 0, 0)) == INVALID_SOCKET)
{
debug_printf ("WSASocket error");
set_winsock_errno ();
}
else if (!new_sock && !winsock2_active)
{
load_wsock32 ();
fhandler_base::fixup_after_fork (parent);
debug_printf ("Without Winsock 2.0");
}
else
{
debug_printf ("WSASocket went fine new_sock %p, old_sock %p", new_sock, get_io_handle ());
set_io_handle ((HANDLE) new_sock);
}
if (secret_event)
fork_fixup (parent, secret_event, "secret_event");
}
void
fhandler_socket::fixup_after_exec (HANDLE parent)
{
debug_printf ("here");
if (!get_close_on_exec ())
fixup_after_fork (parent);
#if 0
else if (!winsock2_active)
closesocket (get_socket ());
#endif
}
int
fhandler_socket::dup (fhandler_base *child)
{
debug_printf ("here");
fhandler_socket *fhs = (fhandler_socket *) child;
fhs->addr_family = addr_family;
fhs->set_io_handle (get_io_handle ());
fhs->fixup_before_fork_exec (GetCurrentProcessId ());
if (winsock2_active)
{
fhs->fixup_after_fork (hMainProc);
return 0;
}
return fhandler_base::dup (child);
}
int __stdcall
fhandler_socket::fstat (struct stat *buf, path_conv *pc)
{
fhandler_disk_file fh;
fh.set_name (get_name (), get_win32_name ());
return fh.fstat (buf, pc);
}
int __stdcall
fhandler_socket::read (void *ptr, size_t len)
{
sigframe thisframe (mainthread);
int res = recv (get_socket (), (char *) ptr, len, 0);
if (res == SOCKET_ERROR)
set_winsock_errno ();
return res;
}
int
fhandler_socket::write (const void *ptr, size_t len)
{
sigframe thisframe (mainthread);
int res = send (get_socket (), (const char *) ptr, len, 0);
if (res == SOCKET_ERROR)
{
set_winsock_errno ();
if (get_errno () == ECONNABORTED || get_errno () == ECONNRESET)
_raise (SIGPIPE);
}
return res;
}
/* Cygwin internal */
int
fhandler_socket::close ()
{
int res = 0;
sigframe thisframe (mainthread);
/* HACK to allow a graceful shutdown even if shutdown() hasn't been
called by the application. Note that this isn't the ultimate
solution but it helps in many cases. */
struct linger linger;
linger.l_onoff = 1;
linger.l_linger = 240; /* seconds. default 2MSL value according to MSDN. */
setsockopt (get_socket (), SOL_SOCKET, SO_LINGER,
(const char *)&linger, sizeof linger);
while ((res = closesocket (get_socket ()))
&& WSAGetLastError () == WSAEWOULDBLOCK)
continue;
if (res)
{
set_winsock_errno ();
res = -1;
}
close_secret_event ();
debug_printf ("%d = fhandler_socket::close()", res);
return res;
}
#define ASYNC_MASK (FD_READ|FD_WRITE|FD_OOB|FD_ACCEPT|FD_CONNECT)
/* Cygwin internal */
int
fhandler_socket::ioctl (unsigned int cmd, void *p)
{
extern int get_ifconf (struct ifconf *ifc, int what); /* net.cc */
int res;
struct ifconf ifc, *ifcp;
struct ifreq *ifr, *ifrp;
sigframe thisframe (mainthread);
switch (cmd)
{
case SIOCGIFCONF:
ifcp = (struct ifconf *) p;
if (!ifcp)
{
set_errno (EINVAL);
return -1;
}
res = get_ifconf (ifcp, cmd);
if (res)
debug_printf ("error in get_ifconf\n");
break;
case SIOCGIFFLAGS:
ifr = (struct ifreq *) p;
if (ifr == 0)
{
set_errno (EINVAL);
return -1;
}
ifr->ifr_flags = IFF_NOTRAILERS | IFF_UP | IFF_RUNNING;
if (ntohl (((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr)
== INADDR_LOOPBACK)
ifr->ifr_flags |= IFF_LOOPBACK;
else
ifr->ifr_flags |= IFF_BROADCAST;
res = 0;
break;
case SIOCGIFBRDADDR:
case SIOCGIFNETMASK:
case SIOCGIFADDR:
case SIOCGIFHWADDR:
case SIOCGIFMETRIC:
case SIOCGIFMTU:
{
ifc.ifc_len = 2048;
ifc.ifc_buf = (char *) alloca (2048);
ifr = (struct ifreq *) p;
if (ifr == 0)
{
debug_printf ("ifr == NULL\n");
set_errno (EINVAL);
return -1;
}
res = get_ifconf (&ifc, cmd);
if (res)
{
debug_printf ("error in get_ifconf\n");
break;
}
debug_printf (" name: %s\n", ifr->ifr_name);
for (ifrp = ifc.ifc_req;
(caddr_t) ifrp < ifc.ifc_buf + ifc.ifc_len;
++ifrp)
{
debug_printf ("testname: %s\n", ifrp->ifr_name);
if (! strcmp (ifrp->ifr_name, ifr->ifr_name))
{
switch (cmd)
{
case SIOCGIFADDR:
ifr->ifr_addr = ifrp->ifr_addr;
break;
case SIOCGIFBRDADDR:
ifr->ifr_broadaddr = ifrp->ifr_broadaddr;
break;
case SIOCGIFNETMASK:
ifr->ifr_netmask = ifrp->ifr_netmask;
break;
case SIOCGIFHWADDR:
ifr->ifr_hwaddr = ifrp->ifr_hwaddr;
break;
case SIOCGIFMETRIC:
ifr->ifr_metric = ifrp->ifr_metric;
break;
case SIOCGIFMTU:
ifr->ifr_mtu = ifrp->ifr_mtu;
break;
}
break;
}
}
if ((caddr_t) ifrp >= ifc.ifc_buf + ifc.ifc_len)
{
set_errno (EINVAL);
return -1;
}
break;
}
case FIOASYNC:
res = WSAAsyncSelect (get_socket (), gethwnd (), WM_ASYNCIO,
*(int *) p ? ASYNC_MASK : 0);
syscall_printf ("Async I/O on socket %s",
*(int *) p ? "started" : "cancelled");
set_async (*(int *) p);
break;
default:
/* We must cancel WSAAsyncSelect (if any) before setting socket to
* blocking mode
*/
if (cmd == FIONBIO && *(int *) p == 0)
WSAAsyncSelect (get_socket (), gethwnd (), 0, 0);
res = ioctlsocket (get_socket (), cmd, (unsigned long *) p);
if (res == SOCKET_ERROR)
set_winsock_errno ();
if (cmd == FIONBIO)
{
syscall_printf ("socket is now %sblocking",
*(int *) p ? "non" : "");
/* Start AsyncSelect if async socket unblocked */
if (*(int *) p && get_async ())
WSAAsyncSelect (get_socket (), gethwnd (), WM_ASYNCIO, ASYNC_MASK);
set_nonblocking (*(int *) p);
}
break;
}
syscall_printf ("%d = ioctl_socket (%x, %x)", res, cmd, p);
return res;
}
int
fhandler_socket::fcntl (int cmd, void *arg)
{
int res = 0;
int request, current;
switch (cmd)
{
case F_SETFL:
{
/* Carefully test for the O_NONBLOCK or deprecated OLD_O_NDELAY flag.
Set only the flag that has been passed in. If both are set, just
record O_NONBLOCK. */
int new_flags = (int) arg & O_NONBLOCK_MASK;
if ((new_flags & OLD_O_NDELAY) && (new_flags & O_NONBLOCK))
new_flags = O_NONBLOCK;
current = get_flags () & O_NONBLOCK_MASK;
request = new_flags ? 1 : 0;
if (!!current != !!new_flags && (res = ioctl (FIONBIO, &request)))
break;
set_flags ((get_flags () & ~O_NONBLOCK_MASK) | new_flags);
break;
}
default:
res = fhandler_base::fcntl (cmd, arg);
break;
}
return res;
}
void
fhandler_socket::set_close_on_exec (int val)
{
if (!winsock2_active) /* < Winsock 2.0 */
set_inheritance (get_handle (), val);
set_close_on_exec_flag (val);
debug_printf ("set close_on_exec for %s to %d", get_name (), val);
}
void
fhandler_socket::set_sun_path (const char *path)
{
if (sun_path)
cfree (sun_path);
sun_path = cstrdup (path);
}
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