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/* cygserver_transport_pipes.cc
Copyright 2001, 2002 Red Hat Inc.
Written by Robert Collins <rbtcollins@hotmail.com>
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. */
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <windows.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include "wincap.h"
#include "cygwin/cygserver_transport.h"
#include "cygwin/cygserver_transport_pipes.h"
/* to allow this to link into cygwin and the .dll, a little magic is needed. */
#ifndef __OUTSIDE_CYGWIN__
#include "winsup.h"
#else
#define DEBUG 0
#define debug_printf if (DEBUG) printf
#endif
//SECURITY_DESCRIPTOR transport_layer_pipes::sd;
//SECURITY_ATTRIBUTES transport_layer_pipes::sec_none_nih, transport_layer_pipes::sec_all_nih;
//bool transport_layer_pipes::inited = false;
transport_layer_pipes::transport_layer_pipes (HANDLE new_pipe)
{
inited = false; //FIXME: allow inited, sd, all_nih_.. to be static members
pipe = new_pipe;
if (inited != true)
init_security();
};
transport_layer_pipes::transport_layer_pipes ()
{
inited = false;
pipe = NULL;
strcpy(pipe_name, "\\\\.\\pipe\\cygwin_lpc");
if (inited != true)
init_security();
}
void
transport_layer_pipes::init_security()
{
/* FIXME: pthread_once or equivalent needed */
InitializeSecurityDescriptor (&sd, SECURITY_DESCRIPTOR_REVISION);
SetSecurityDescriptorDacl (&sd, TRUE, 0, FALSE);
sec_none_nih.nLength = sec_all_nih.nLength = sizeof (SECURITY_ATTRIBUTES);
sec_none_nih.bInheritHandle = sec_all_nih.bInheritHandle = FALSE;
sec_none_nih.lpSecurityDescriptor = NULL;
sec_all_nih.lpSecurityDescriptor = &sd;
inited = true;
}
void
transport_layer_pipes::listen ()
{
/* no-op */
}
class transport_layer_pipes *
transport_layer_pipes::accept ()
{
if (pipe)
{
debug_printf ("Already have a pipe in this %p\n",this);
return NULL;
}
pipe = CreateNamedPipe (pipe_name,
PIPE_ACCESS_DUPLEX,
PIPE_TYPE_BYTE | PIPE_WAIT,
PIPE_UNLIMITED_INSTANCES,
0, 0, 1000,
&sec_all_nih );
if (pipe == INVALID_HANDLE_VALUE)
{
debug_printf ("error creating pipe (%lu)\n.", GetLastError ());
return NULL;
}
if ( !ConnectNamedPipe ( pipe, NULL ) &&
GetLastError () != ERROR_PIPE_CONNECTED)
{
printf ("error connecting to pipe (%lu)\n.", GetLastError ());
CloseHandle (pipe);
pipe = NULL;
return NULL;
}
transport_layer_pipes *new_conn = new transport_layer_pipes (pipe);
pipe = NULL;
return new_conn;
}
void
transport_layer_pipes::close()
{
debug_printf ("closing pipe %p\n", pipe);
if (pipe && pipe != INVALID_HANDLE_VALUE)
{
FlushFileBuffers (pipe);
DisconnectNamedPipe (pipe);
CloseHandle (pipe);
}
}
ssize_t
transport_layer_pipes::read (char *buf, size_t len)
{
debug_printf ("reading from pipe %p\n", pipe);
if (!pipe || pipe == INVALID_HANDLE_VALUE)
return -1;
DWORD bytes_read;
DWORD rc = ReadFile (pipe, buf, len, &bytes_read, NULL);
if (!rc)
{
debug_printf ("error reading from pipe (%lu)\n", GetLastError ());
return -1;
}
return bytes_read;
}
ssize_t
transport_layer_pipes::write (char *buf, size_t len)
{
debug_printf ("writing to pipe %p\n", pipe);
DWORD bytes_written, rc;
if (!pipe || pipe == INVALID_HANDLE_VALUE)
return -1;
rc = WriteFile (pipe, buf, len, &bytes_written, NULL);
if (!rc)
{
debug_printf ("error writing to pipe (%lu)\n", GetLastError ());
return -1;
}
return bytes_written;
}
bool
transport_layer_pipes::connect ()
{
if (pipe && pipe != INVALID_HANDLE_VALUE)
{
debug_printf ("Already have a pipe in this %p\n",this);
return false;
}
while (1)
{
pipe = CreateFile (pipe_name,
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
&sec_all_nih,
OPEN_EXISTING,
0, NULL);
if (pipe != INVALID_HANDLE_VALUE)
/* got the pipe */
return true;
if (GetLastError () != ERROR_PIPE_BUSY)
{
debug_printf ("Error opening the pipe (%lu)\n", GetLastError ());
pipe = NULL;
return false;
}
if (!WaitNamedPipe (pipe_name, 20000))
debug_printf ( "error connecting to server pipe after 20 seconds (%lu)\n", GetLastError () );
/* We loop here, because the pipe exists but is busy. If it doesn't exist
* the != ERROR_PIPE_BUSY will catch it.
*/
}
}
void
transport_layer_pipes::impersonate_client ()
{
debug_printf ("impersonating pipe %p\n", pipe);
if (pipe && pipe != INVALID_HANDLE_VALUE)
{
BOOL rv = ImpersonateNamedPipeClient (pipe);
if (!rv)
debug_printf ("Failed to Impersonate the client, (%lu)\n", GetLastError ());
}
debug_printf("I am who you are\n");
}
void
transport_layer_pipes::revert_to_self ()
{
RevertToSelf ();
debug_printf("I am who I yam\n");
}
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