sane-project-backends/backend/xerox_mfp-tcp.c

/*
 *	SANE backend for
 *		Samsung SCX-4500W
 *
 *	Network Scanners Support
 *	Copyright 2010 Alexander Kuznetsov <acca(at)cpan.org>
 *
 * This program is licensed under GPL + SANE exception.
 * More info at http://www.sane-project.org/license.html
 *
 */

#undef	BACKEND_NAME
#define	BACKEND_NAME xerox_mfp
#define DEBUG_DECLARE_ONLY
#define DEBUG_NOT_STATIC

#include "sane/config.h"


#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/types.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif

#include "sane/saneopts.h"
#include "sane/sanei_scsi.h"
#include "sane/sanei_usb.h"
#include "sane/sanei_pio.h"
#include "sane/sanei_tcp.h"
#include "sane/sanei_udp.h"
#include "sane/sanei_backend.h"
#include "sane/sanei_config.h"

#include "xerox_mfp.h"


#define	RECV_TIMEOUT	1	/*	seconds		*/
extern int sanei_debug_xerox_mfp;

int	tcp_dev_request (struct device *dev,
	    SANE_Byte *cmd, size_t cmdlen,
	    SANE_Byte *resp, size_t *resplen)
{
    size_t	bytes_recv = 0;
    ssize_t	rc = 1;
    size_t	len;


    /* Send request, if any */
    if (cmd && cmdlen) {
	len = (size_t)sanei_tcp_write(dev->dn, cmd, cmdlen);
	if (len != cmdlen) {
	    DBG (1, "%s: sent only %lu bytes of %lu\n",
		__FUNCTION__, (u_long)len, (u_long)cmdlen);
    	    return SANE_STATUS_IO_ERROR;
	}
    }

    /* Receive response, if expected */
    if (resp && resplen) {
	DBG (3, "%s: wait for %i bytes\n", __FUNCTION__, (int)*resplen);

	while (bytes_recv < *resplen && rc > 0) {
	    rc = recv(dev->dn, resp+bytes_recv, *resplen-bytes_recv, 0);

	    if (rc > 0)	bytes_recv += rc;
	    else {
		DBG(1, "%s: error %s, bytes requested: %i, bytes read: %i\n",
		    __FUNCTION__, strerror(errno), (int)*resplen, (int)bytes_recv);
		*resplen = bytes_recv;
/*
    TODO:
	do something smarter than that!
*/
		return SANE_STATUS_GOOD;
		return SANE_STATUS_IO_ERROR;
	    }
	}
    }

    *resplen = bytes_recv;

  return SANE_STATUS_GOOD;
}

SANE_Status	tcp_dev_open (struct device *dev)
{
    SANE_Status 	status;
    char*		strhost;
    char*		strport;
    int			port;
    struct		servent *sp;
    struct		timeval tv;
    SANE_String_Const	devname;


    devname = dev->sane.name;
    DBG (3, "%s: open %s\n", __FUNCTION__, devname);

    if (strncmp (devname, "tcp", 3) != 0)	return SANE_STATUS_INVAL;
    devname += 3;
    devname = sanei_config_skip_whitespace (devname);
    if (!*devname)	return SANE_STATUS_INVAL;

    devname = sanei_config_get_string (devname, &strhost);
    devname = sanei_config_skip_whitespace (devname);

    if (*devname)
	devname = sanei_config_get_string (devname, &strport);
    else
	strport = "9400";


    if (isdigit(*strport)) {
	port = atoi(strport);
    } else {
	if ((sp = getservbyname(strport, "tcp"))) {
	    port = ntohs(sp->s_port);
	} else {
	    DBG (1, "%s: unknown TCP service %s\n", __FUNCTION__, strport);
	    return SANE_STATUS_IO_ERROR;
	}
    }

    status = sanei_tcp_open(strhost, port, &dev->dn);
    if (status == SANE_STATUS_GOOD) {
	tv.tv_sec  = RECV_TIMEOUT;
	tv.tv_usec = 0;
	if (setsockopt (dev->dn, SOL_SOCKET, SO_RCVTIMEO, (char *)&tv, sizeof tv) < 0) {
	    DBG(1, "%s: setsockopts %s", __FUNCTION__, strerror(errno));
	}
    }

    return status;
}

void
tcp_dev_close (struct device *dev)
{
    if (!dev)	return;

    DBG (3, "%s: closing dev %p\n", __FUNCTION__, (void *)dev);

    /* finish all operations */
    if (dev->scanning) {
	dev->cancel = 1;
	/* flush READ_IMAGE data */
	if (dev->reading)	sane_read(dev, NULL, 1, NULL);
    /* send cancel if not sent before */
	if (dev->state != SANE_STATUS_CANCELLED)
	    ret_cancel(dev, 0);
    }

    sanei_tcp_close(dev->dn);
    dev->dn = -1;
}


SANE_Status
tcp_configure_device (const char *devname, SANE_Status (*list_one)(SANE_String_Const devname))
{
/*
    TODO:	LAN scanners multicast discovery.
		devname would contain "tcp auto"
		
		We find new devnames and feed them to
		`list_one_device' one by one
*/
    return list_one(devname);
}

/* xerox_mfp-tcp.c */