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Edit File: Xtransint.h

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* Copyright 1993, 1994 NCR Corporation - Dayton, Ohio, USA
 *
 * All Rights Reserved
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose and without fee is hereby granted, provided
 * that the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name NCR not be used in advertising
 * or publicity pertaining to distribution of the software without specific,
 * written prior permission.  NCR makes no representations about the
 * suitability of this software for any purpose.  It is provided "as is"
 * without express or implied warranty.
 *
 * NCR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
 * NO EVENT SHALL NCR BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
 * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef _XTRANSINT_H_
#define _XTRANSINT_H_

/*
 * XTRANSDEBUG will enable the PRMSG() macros used in the X Transport
 * Interface code. Each use of the PRMSG macro has a level associated with
 * it. XTRANSDEBUG is defined to be a level. If the invocation level is =<
 * the value of XTRANSDEBUG, then the message will be printed out to stderr.
 * Recommended levels are:
 *
 *	XTRANSDEBUG=1	Error messages
 *	XTRANSDEBUG=2 API Function Tracing
 *	XTRANSDEBUG=3 All Function Tracing
 *	XTRANSDEBUG=4 printing of intermediate values
 *	XTRANSDEBUG=5 really detailed stuff
#define XTRANSDEBUG 2
 *
 * Defining XTRANSDEBUGTIMESTAMP will cause printing timestamps with each
 * message.
 */

#if !defined(XTRANSDEBUG) && defined(XTRANS_TRANSPORT_C)
#  define XTRANSDEBUG 1
#endif

#ifdef WIN32
# define _WILLWINSOCK_
#endif

#include "Xtrans.h"

#ifndef _X_UNUSED  /* Defined in Xfuncproto.h in xproto >= 7.0.22 */
# define _X_UNUSED  /* */
#endif

#ifdef XTRANSDEBUG
# include <stdio.h>
#endif /* XTRANSDEBUG */

#include <errno.h>

#ifndef WIN32
#  include <sys/socket.h>
# include <netinet/in.h>
# include <arpa/inet.h>

/*
 * Moved the setting of NEED_UTSNAME to this header file from Xtrans.c,
 * to avoid a race condition. JKJ (6/5/97)
 */

# if defined(_POSIX_SOURCE) || defined(USG) || defined(SVR4) || defined(__SVR4) || defined(__SCO__)
#  ifndef NEED_UTSNAME
#   define NEED_UTSNAME
#  endif
#  include <sys/utsname.h>
# endif

#  define ESET(val) errno = val
# define EGET() errno

#else /* WIN32 */

# include <limits.h>	/* for USHRT_MAX */

# define ESET(val) WSASetLastError(val)
# define EGET() WSAGetLastError()

#endif /* WIN32 */

#include <stddef.h>

#ifdef X11_t
#define X_TCP_PORT	6000
#endif

#if XTRANS_SEND_FDS

struct _XtransConnFd {
    struct _XtransConnFd   *next;
    int                    fd;
    int                    do_close;
};

#endif

struct _XtransConnInfo {
    struct _Xtransport     *transptr;
    int		index;
    char	*priv;
    int		flags;
    int		fd;
    char	*port;
    int		family;
    char	*addr;
    int		addrlen;
    char	*peeraddr;
    int		peeraddrlen;
    struct _XtransConnFd        *recv_fds;
    struct _XtransConnFd        *send_fds;
};

#define XTRANS_OPEN_COTS_CLIENT       1
#define XTRANS_OPEN_COTS_SERVER       2

typedef struct _Xtransport {
    const char	*TransName;
    int		flags;

#ifdef TRANS_CLIENT

XtransConnInfo (*OpenCOTSClient)(
	struct _Xtransport *,	/* transport */
	const char *,		/* protocol */
	const char *,		/* host */
	const char *		/* port */
    );

#endif /* TRANS_CLIENT */

#ifdef TRANS_SERVER
    const char **	nolisten;
    XtransConnInfo (*OpenCOTSServer)(
	struct _Xtransport *,	/* transport */
	const char *,		/* protocol */
	const char *,		/* host */
	const char *		/* port */
    );

#endif /* TRANS_SERVER */

#ifdef TRANS_REOPEN

XtransConnInfo (*ReopenCOTSServer)(
	struct _Xtransport *,	/* transport */
        int,			/* fd */
        const char *		/* port */
    );

#endif /* TRANS_REOPEN */

int	(*SetOption)(
	XtransConnInfo,		/* connection */
	int,			/* option */
	int			/* arg */
    );

#ifdef TRANS_SERVER
/* Flags */
# define ADDR_IN_USE_ALLOWED	1

int	(*CreateListener)(
	XtransConnInfo,		/* connection */
	const char *,		/* port */
	unsigned int		/* flags */
    );

int	(*ResetListener)(
	XtransConnInfo		/* connection */
    );

XtransConnInfo (*Accept)(
	XtransConnInfo,		/* connection */
        int *			/* status */
    );

#endif /* TRANS_SERVER */

#ifdef TRANS_CLIENT

int	(*Connect)(
	XtransConnInfo,		/* connection */
	const char *,		/* host */
	const char *		/* port */
    );

#endif /* TRANS_CLIENT */

int	(*BytesReadable)(
	XtransConnInfo,		/* connection */
	BytesReadable_t *	/* pend */
    );

int	(*Read)(
	XtransConnInfo,		/* connection */
	char *,			/* buf */
	int			/* size */
    );

int	(*Write)(
	XtransConnInfo,		/* connection */
	char *,			/* buf */
	int			/* size */
    );

int	(*Readv)(
	XtransConnInfo,		/* connection */
	struct iovec *,		/* buf */
	int			/* size */
    );

int	(*Writev)(
	XtransConnInfo,		/* connection */
	struct iovec *,		/* buf */
	int			/* size */
    );

#if XTRANS_SEND_FDS
    int (*SendFd)(
	XtransConnInfo,		/* connection */
        int,                    /* fd */
        int                     /* do_close */
    );

int (*RecvFd)(
	XtransConnInfo		/* connection */
    );
#endif

int	(*Disconnect)(
	XtransConnInfo		/* connection */
    );

int	(*Close)(
	XtransConnInfo		/* connection */
    );

int	(*CloseForCloning)(
	XtransConnInfo		/* connection */
    );

} Xtransport;

typedef struct _Xtransport_table {
    Xtransport	*transport;
    int		transport_id;
} Xtransport_table;

/*
 * Flags for the flags member of Xtransport.
 */

#define TRANS_ALIAS	(1<<0)	/* record is an alias, don't create server */
#define TRANS_LOCAL	(1<<1)	/* local transport */
#define TRANS_DISABLED	(1<<2)	/* Don't open this one */
#define TRANS_NOLISTEN  (1<<3)  /* Don't listen on this one */
#define TRANS_NOUNLINK	(1<<4)	/* Don't unlink transport endpoints */
#define TRANS_ABSTRACT	(1<<5)	/* Use abstract sockets if available */
#define TRANS_NOXAUTH	(1<<6)	/* Don't verify authentication (because it's secure some other way at the OS layer) */
#define TRANS_RECEIVED	(1<<7)  /* The fd for this has already been opened by someone else. */

/* Flags to preserve when setting others */
#define TRANS_KEEPFLAGS	(TRANS_NOUNLINK|TRANS_ABSTRACT)

#ifdef XTRANS_TRANSPORT_C /* only provide static function prototypes when
			     building the transport.c file that has them in */

#ifdef __clang__
/* Not all clients make use of all provided statics */
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunused-function"
#endif

/*
 * readv() and writev() don't exist or don't work correctly on some
 * systems, so they may be emulated.
 */

#ifdef WIN32

#define READV(ciptr, iov, iovcnt)	TRANS(ReadV)(ciptr, iov, iovcnt)

static	int TRANS(ReadV)(
    XtransConnInfo,	/* ciptr */
    struct iovec *,	/* iov */
    int			/* iovcnt */
);

#else

#define READV(ciptr, iov, iovcnt)	readv(ciptr->fd, iov, iovcnt)

#endif /* WIN32 */

#ifdef WIN32

#define WRITEV(ciptr, iov, iovcnt)	TRANS(WriteV)(ciptr, iov, iovcnt)

static int TRANS(WriteV)(
    XtransConnInfo,	/* ciptr */
    struct iovec *,	/* iov */
    int 		/* iovcnt */
);

#else

#define WRITEV(ciptr, iov, iovcnt)	writev(ciptr->fd, iov, iovcnt)

#endif /* WIN32 */

static int is_numeric (
    const char *	/* str */
);

#ifdef TRANS_SERVER
static int trans_mkdir (
    const char *,	/* path */
    int			/* mode */
);
#endif

#ifdef __clang__
#pragma clang diagnostic pop
#endif

/*
 * Some XTRANSDEBUG stuff
 */

#ifdef XTRANSDEBUG
#include <stdarg.h>

/*
 * The X server provides ErrorF() & VErrorF(), for other software that uses
 * xtrans, we provide our own simple versions.
 */
# if defined(XSERV_t) && defined(TRANS_SERVER)
#  include "os.h"
# else
static inline void _X_ATTRIBUTE_PRINTF(1, 0)
VErrorF(const char *f, va_list args)
{
    vfprintf(stderr, f, args);
    fflush(stderr);
}

static inline void  _X_ATTRIBUTE_PRINTF(1, 2)
ErrorF(const char *f, ...)
{
    va_list args;

va_start(args, f);
    VErrorF(f, args);
    va_end(args);
}
# endif /* xserver */
#endif /* XTRANSDEBUG */

static inline void  _X_ATTRIBUTE_PRINTF(2, 3)
prmsg(int lvl, const char *f, ...)
{
#ifdef XTRANSDEBUG
    va_list args;

va_start(args, f);
    if (lvl <= XTRANSDEBUG) {
	int saveerrno = errno;

ErrorF("%s", __xtransname);
	VErrorF(f, args);

# ifdef XTRANSDEBUGTIMESTAMP
	{
	    struct timeval tp;
	    gettimeofday(&tp, 0);
	    ErrorF("timestamp (ms): %d\n",
		   tp.tv_sec * 1000 + tp.tv_usec / 1000);
	}
# endif
	errno = saveerrno;
    }
    va_end(args);
#endif /* XTRANSDEBUG */
}

#endif /* XTRANS_TRANSPORT_C */

#endif /* _XTRANSINT_H_ */