[thirdparty/cups.git] / backend / network.c

/*
 * Common backend network APIs for CUPS.
 *
 * Copyright 2007-2016 by Apple Inc.
 * Copyright 2006-2007 by Easy Software Products, all rights reserved.
 *
 * These coded instructions, statements, and computer programs are the
 * property of Apple Inc. and are protected by Federal copyright
 * law.  Distribution and use rights are outlined in the file "LICENSE.txt"
 * "LICENSE" which should have been included with this file.  If this
 * file is missing or damaged, see the license at "http://www.cups.org/".
 */

/*
 * Include necessary headers.
 */

#include "backend-private.h"
#include <limits.h>
#include <sys/select.h>


/*
 * 'backendCheckSideChannel()' - Check the side-channel for pending requests.
 */

void
backendCheckSideChannel(
    int         snmp_fd,		/* I - SNMP socket */
    http_addr_t *addr)			/* I - Address of device */
{
  fd_set	input;			/* Select input set */
  struct timeval timeout;		/* Select timeout */


  FD_ZERO(&input);
  FD_SET(CUPS_SC_FD, &input);

  timeout.tv_sec = timeout.tv_usec = 0;

  if (select(CUPS_SC_FD + 1, &input, NULL, NULL, &timeout) > 0)
    backendNetworkSideCB(-1, -1, snmp_fd, addr, 0);
}


/*
 * 'backendLookup()' - Lookup the given host and log addresses.
 */

http_addrlist_t	*			/* O - List of addresses or NULL */
backendLookup(const char *hostname,	/* I - Hostname */
              int        port,		/* I - Port number */
	      int        *cancel)	/* I - Variable to watch for job cancel */
{
  char			portname[32],	/* Port number as string */
			addrname[256];	/* Address as string */
  http_addrlist_t	*addrlist,	/* List of addresses */
			*current;	/* Current address */


 /*
  * Lookup the address for the named host...
  */

  snprintf(portname, sizeof(portname), "%d", port);

  fputs("STATE: +connecting-to-device\n", stderr);
  fprintf(stderr, "DEBUG: Looking up \"%s\"...\n", hostname);

  while ((addrlist = httpAddrGetList(hostname, AF_UNSPEC, portname)) == NULL)
  {
    _cupsLangPrintFilter(stderr, "INFO", _("Unable to locate printer \"%s\"."), hostname);
    sleep(10);

    if (getenv("CLASS") != NULL)
    {
      fputs("STATE: -connecting-to-device\n", stderr);
      exit(CUPS_BACKEND_STOP);
    }

    if (cancel && *cancel)
    {
      fputs("STATE: -connecting-to-device\n", stderr);
      exit(CUPS_BACKEND_OK);
    }
  }

  fputs("STATE: -connecting-to-device\n", stderr);

 /*
  * Log the addresses we got...
  */

  for (current = addrlist; current; current = current->next)
    fprintf(stderr, "DEBUG: %s=%s\n", hostname, httpAddrString(&current->addr, addrname, sizeof(addrname)));

 /*
  * Return...
  */

  return (addrlist);
}


/*
 * 'backendNetworkSideCB()' - Handle common network side-channel commands.
 */

int					/* O - -1 on error, 0 on success */
backendNetworkSideCB(
    int         print_fd,		/* I - Print file or -1 */
    int         device_fd,		/* I - Device file or -1 */
    int         snmp_fd,		/* I - SNMP socket */
    http_addr_t *addr,			/* I - Address of device */
    int         use_bc)			/* I - Use back-channel data? */
{
  cups_sc_command_t	command;	/* Request command */
  cups_sc_status_t	status;		/* Request/response status */
  char			data[65536];	/* Request/response data */
  int			datalen;	/* Request/response data size */
  const char		*device_id;	/* 1284DEVICEID env var */


  datalen = sizeof(data);

  if (cupsSideChannelRead(&command, &status, data, &datalen, 1.0))
    return (-1);

  switch (command)
  {
    case CUPS_SC_CMD_DRAIN_OUTPUT :
       /*
        * Our sockets disable the Nagle algorithm and data is sent immediately.
	*/

        if (device_fd < 0)
	  status = CUPS_SC_STATUS_NOT_IMPLEMENTED;
	else if (backendDrainOutput(print_fd, device_fd))
	  status = CUPS_SC_STATUS_IO_ERROR;
	else
          status = CUPS_SC_STATUS_OK;

	datalen = 0;
        break;

    case CUPS_SC_CMD_GET_BIDI :
	status  = CUPS_SC_STATUS_OK;
        data[0] = (char)use_bc;
        datalen = 1;
        break;

    case CUPS_SC_CMD_SNMP_GET :
    case CUPS_SC_CMD_SNMP_GET_NEXT :
        fprintf(stderr, "DEBUG: CUPS_SC_CMD_SNMP_%s: %d (%s)\n",
	        command == CUPS_SC_CMD_SNMP_GET ? "GET" : "GET_NEXT", datalen,
		data);

        if (datalen < 2)
	{
	  status  = CUPS_SC_STATUS_BAD_MESSAGE;
	  datalen = 0;
	  break;
	}

        if (snmp_fd >= 0)
	{
	  char		*dataptr;	/* Pointer into data */
	  cups_snmp_t	packet;		/* Packet from printer */
          const char	*snmp_value;	/* CUPS_SNMP_VALUE env var */

          if ((snmp_value = getenv("CUPS_SNMP_VALUE")) != NULL)
          {
            const char	*snmp_count;	/* CUPS_SNMP_COUNT env var */
            int		count;		/* Repetition count */

            if ((snmp_count = getenv("CUPS_SNMP_COUNT")) != NULL)
            {
              if ((count = atoi(snmp_count)) <= 0)
                count = 1;
            }
            else
              count = 1;

	    for (dataptr = data + strlen(data) + 1;
	         count > 0 && dataptr < (data + sizeof(data) - 1);
	         count --, dataptr += strlen(dataptr))
	      strlcpy(dataptr, snmp_value, sizeof(data) - (size_t)(dataptr - data));

	    fprintf(stderr, "DEBUG: Returning %s %s\n", data,
	            data + strlen(data) + 1);

	    status  = CUPS_SC_STATUS_OK;
	    datalen = (int)(dataptr - data);
	    break;
          }

          if (!_cupsSNMPStringToOID(data, packet.object_name, CUPS_SNMP_MAX_OID))
	  {
	    status  = CUPS_SC_STATUS_BAD_MESSAGE;
	    datalen = 0;
	    break;
	  }

          status  = CUPS_SC_STATUS_IO_ERROR;
	  datalen = 0;

          if (_cupsSNMPWrite(snmp_fd, addr, CUPS_SNMP_VERSION_1,
	                     _cupsSNMPDefaultCommunity(),
	                     command == CUPS_SC_CMD_SNMP_GET ?
			         CUPS_ASN1_GET_REQUEST :
				 CUPS_ASN1_GET_NEXT_REQUEST, 1,
			     packet.object_name))
          {
	    if (_cupsSNMPRead(snmp_fd, &packet, 1.0))
	    {
	      size_t	i;		/* Looping var */


              if (!_cupsSNMPOIDToString(packet.object_name, data, sizeof(data)))
	      {
	        fputs("DEBUG: Bad OID returned!\n", stderr);
	        break;
	      }

	      datalen = (int)strlen(data) + 1;
              dataptr = data + datalen;

	      switch (packet.object_type)
	      {
	        case CUPS_ASN1_BOOLEAN :
		    snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%d", packet.object_value.boolean);
	            datalen += (int)strlen(dataptr);
		    break;

	        case CUPS_ASN1_INTEGER :
		    snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%d",
		             packet.object_value.integer);
	            datalen += (int)strlen(dataptr);
		    break;

	        case CUPS_ASN1_BIT_STRING :
	        case CUPS_ASN1_OCTET_STRING :
		    if (packet.object_value.string.num_bytes < (sizeof(data) - (size_t)(dataptr - data)))
		      i = packet.object_value.string.num_bytes;
		    else
		      i = sizeof(data) - (size_t)(dataptr - data);

		    memcpy(dataptr, packet.object_value.string.bytes, i);

                    datalen += (int)i;
		    break;

	        case CUPS_ASN1_OID :
		    _cupsSNMPOIDToString(packet.object_value.oid, dataptr,
		                         sizeof(data) - (size_t)(dataptr - data));
	            datalen += (int)strlen(dataptr);
		    break;

                case CUPS_ASN1_HEX_STRING :
		    for (i = 0;
		         i < packet.object_value.string.num_bytes &&
			     dataptr < (data + sizeof(data) - 3);
			 i ++, dataptr += 2)
		      sprintf(dataptr, "%02X", packet.object_value.string.bytes[i]);
	            datalen += (int)strlen(dataptr);
		    break;

                case CUPS_ASN1_COUNTER :
		    snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%u", packet.object_value.counter);
	            datalen += (int)strlen(dataptr);
		    break;

                case CUPS_ASN1_GAUGE :
		    snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%u", packet.object_value.gauge);
	            datalen += (int)strlen(dataptr);
		    break;

                case CUPS_ASN1_TIMETICKS :
		    snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%u", packet.object_value.timeticks);
	            datalen += (int)strlen(dataptr);
		    break;

                default :
	            fprintf(stderr, "DEBUG: Unknown OID value type %02X.\n", packet.object_type);

		case CUPS_ASN1_NULL_VALUE :
		    dataptr[0] = '\0';
		    break;
              }

	      fprintf(stderr, "DEBUG: Returning %s %s\n", data, data + datalen);

	      status = CUPS_SC_STATUS_OK;
	    }
	    else
	      fputs("DEBUG: SNMP read error...\n", stderr);
	  }
	  else
	    fputs("DEBUG: SNMP write error...\n", stderr);
	  break;
        }

        status  = CUPS_SC_STATUS_NOT_IMPLEMENTED;
	datalen = 0;
	break;

    case CUPS_SC_CMD_GET_CONNECTED :
	status  = CUPS_SC_STATUS_OK;
        data[0] = device_fd != -1;
        datalen = 1;
        break;

    case CUPS_SC_CMD_GET_DEVICE_ID :
        if (snmp_fd >= 0)
	{
	  cups_snmp_t	packet;		/* Packet from printer */
	  static const int ppmPrinterIEEE1284DeviceId[] =
	  		{ CUPS_OID_ppmPrinterIEEE1284DeviceId,1,-1 };


          status  = CUPS_SC_STATUS_IO_ERROR;
	  datalen = 0;

          if (_cupsSNMPWrite(snmp_fd, addr, CUPS_SNMP_VERSION_1,
	                     _cupsSNMPDefaultCommunity(),
	                     CUPS_ASN1_GET_REQUEST, 1,
			     ppmPrinterIEEE1284DeviceId))
          {
	    if (_cupsSNMPRead(snmp_fd, &packet, 1.0) &&
	        packet.object_type == CUPS_ASN1_OCTET_STRING)
	    {
	      strlcpy(data, (char *)packet.object_value.string.bytes,
	              sizeof(data));
	      datalen = (int)strlen(data);
	      status  = CUPS_SC_STATUS_OK;
	    }
	  }

	  break;
        }

	if ((device_id = getenv("1284DEVICEID")) != NULL)
	{
	  strlcpy(data, device_id, sizeof(data));
	  datalen = (int)strlen(data);
	  status  = CUPS_SC_STATUS_OK;
	  break;
	}

    default :
        status  = CUPS_SC_STATUS_NOT_IMPLEMENTED;
	datalen = 0;
	break;
  }

  return (cupsSideChannelWrite(command, status, data, datalen, 1.0));
}
Commit	Line	Data
7a14d768	1	/*
5a1d7a17	2	* Common backend network APIs for CUPS.
7a14d768	3	*
f5cffc18	4	* Copyright 2007-2016 by Apple Inc.
5a1d7a17	5	* Copyright 2006-2007 by Easy Software Products, all rights reserved.
7a14d768	6	*
5a1d7a17 MS	7	* These coded instructions, statements, and computer programs are the
	8	* property of Apple Inc. and are protected by Federal copyright
	9	* law. Distribution and use rights are outlined in the file "LICENSE.txt"
	10	* "LICENSE" which should have been included with this file. If this
	11	* file is missing or damaged, see the license at "http://www.cups.org/".
7a14d768 MS	12	*/
	13
	14	/*
	15	* Include necessary headers.
	16	*/
	17
	18	#include "backend-private.h"
	19	#include <limits.h>
5a1d7a17	20	#include <sys/select.h>
7a14d768 MS	21
7a14d768 MS	22
7a14d768 MS	23	/*
	24	* 'backendCheckSideChannel()' - Check the side-channel for pending requests.
	25	*/
	26
7a14d768 MS	27	void
	28	backendCheckSideChannel(
	29	int snmp_fd, /* I - SNMP socket */
	30	http_addr_t addr) / I - Address of device */
	31	{
	32	fd_set input; /* Select input set */
	33	struct timeval timeout; /* Select timeout */
	34
	35
	36	FD_ZERO(&input);
	37	FD_SET(CUPS_SC_FD, &input);
	38
	39	timeout.tv_sec = timeout.tv_usec = 0;
	40
	41	if (select(CUPS_SC_FD + 1, &input, NULL, NULL, &timeout) > 0)
	42	backendNetworkSideCB(-1, -1, snmp_fd, addr, 0);
	43	}
	44
	45
f5cffc18 MS	46	/*
	47	* 'backendLookup()' - Lookup the given host and log addresses.
	48	*/
	49
	50	http_addrlist_t * /* O - List of addresses or NULL */
	51	backendLookup(const char hostname, / I - Hostname */
	52	int port, /* I - Port number */
	53	int cancel) / I - Variable to watch for job cancel */
	54	{
	55	char portname[32], /* Port number as string */
	56	addrname[256]; /* Address as string */
	57	http_addrlist_t addrlist, / List of addresses */
	58	current; / Current address */
	59
	60
	61	/*
	62	* Lookup the address for the named host...
	63	*/
	64
	65	snprintf(portname, sizeof(portname), "%d", port);
	66
	67	fputs("STATE: +connecting-to-device\n", stderr);
	68	fprintf(stderr, "DEBUG: Looking up \"%s\"...\n", hostname);
	69
	70	while ((addrlist = httpAddrGetList(hostname, AF_UNSPEC, portname)) == NULL)
	71	{
	72	_cupsLangPrintFilter(stderr, "INFO", _("Unable to locate printer \"%s\"."), hostname);
	73	sleep(10);
	74
	75	if (getenv("CLASS") != NULL)
	76	{
	77	fputs("STATE: -connecting-to-device\n", stderr);
	78	exit(CUPS_BACKEND_STOP);
	79	}
	80
	81	if (cancel && *cancel)
	82	{
	83	fputs("STATE: -connecting-to-device\n", stderr);
	84	exit(CUPS_BACKEND_OK);
	85	}
	86	}
	87
	88	fputs("STATE: -connecting-to-device\n", stderr);
	89
	90	/*
	91	* Log the addresses we got...
	92	*/
	93
	94	for (current = addrlist; current; current = current->next)
	95	fprintf(stderr, "DEBUG: %s=%s\n", hostname, httpAddrString(&current->addr, addrname, sizeof(addrname)));
	96
	97	/*
	98	* Return...
	99	*/
	100
	101	return (addrlist);
	102	}
	103
	104
7a14d768 MS	105	/*
	106	* 'backendNetworkSideCB()' - Handle common network side-channel commands.
	107	*/
	108
18ecb428	109	int /* O - -1 on error, 0 on success */
7a14d768 MS	110	backendNetworkSideCB(
	111	int print_fd, /* I - Print file or -1 */
	112	int device_fd, /* I - Device file or -1 */
	113	int snmp_fd, /* I - SNMP socket */
	114	http_addr_t addr, / I - Address of device */
	115	int use_bc) /* I - Use back-channel data? */
	116	{
	117	cups_sc_command_t command; /* Request command */
	118	cups_sc_status_t status; /* Request/response status */
dcb445bc	119	char data[65536]; /* Request/response data */
7a14d768 MS	120	int datalen; /* Request/response data size */
	121	const char device_id; / 1284DEVICEID env var */
	122
	123
	124	datalen = sizeof(data);
	125
	126	if (cupsSideChannelRead(&command, &status, data, &datalen, 1.0))
18ecb428	127	return (-1);
7a14d768 MS	128
	129	switch (command)
	130	{
	131	case CUPS_SC_CMD_DRAIN_OUTPUT :
	132	/*
	133	* Our sockets disable the Nagle algorithm and data is sent immediately.
	134	*/
	135
	136	if (device_fd < 0)
	137	status = CUPS_SC_STATUS_NOT_IMPLEMENTED;
	138	else if (backendDrainOutput(print_fd, device_fd))
	139	status = CUPS_SC_STATUS_IO_ERROR;
82cc1f9a	140	else
7a14d768 MS	141	status = CUPS_SC_STATUS_OK;
	142
	143	datalen = 0;
	144	break;
	145
	146	case CUPS_SC_CMD_GET_BIDI :
8b450588	147	status = CUPS_SC_STATUS_OK;
7e86f2f6	148	data[0] = (char)use_bc;
7a14d768 MS	149	datalen = 1;
	150	break;
	151
20fbc903 MS	152	case CUPS_SC_CMD_SNMP_GET :
	153	case CUPS_SC_CMD_SNMP_GET_NEXT :
	154	fprintf(stderr, "DEBUG: CUPS_SC_CMD_SNMP_%s: %d (%s)\n",
	155	command == CUPS_SC_CMD_SNMP_GET ? "GET" : "GET_NEXT", datalen,
	156	data);
	157
	158	if (datalen < 2)
	159	{
	160	status = CUPS_SC_STATUS_BAD_MESSAGE;
	161	datalen = 0;
	162	break;
	163	}
	164
	165	if (snmp_fd >= 0)
	166	{
82cc1f9a	167	char dataptr; / Pointer into data */
20fbc903	168	cups_snmp_t packet; /* Packet from printer */
82cc1f9a	169	const char snmp_value; / CUPS_SNMP_VALUE env var */
20fbc903	170
82cc1f9a MS	171	if ((snmp_value = getenv("CUPS_SNMP_VALUE")) != NULL)
	172	{
	173	const char snmp_count; / CUPS_SNMP_COUNT env var */
	174	int count; /* Repetition count */
	175
	176	if ((snmp_count = getenv("CUPS_SNMP_COUNT")) != NULL)
	177	{
	178	if ((count = atoi(snmp_count)) <= 0)
	179	count = 1;
	180	}
	181	else
	182	count = 1;
	183
	184	for (dataptr = data + strlen(data) + 1;
	185	count > 0 && dataptr < (data + sizeof(data) - 1);
	186	count --, dataptr += strlen(dataptr))
7e86f2f6	187	strlcpy(dataptr, snmp_value, sizeof(data) - (size_t)(dataptr - data));
82cc1f9a MS	188
	189	fprintf(stderr, "DEBUG: Returning %s %s\n", data,
	190	data + strlen(data) + 1);
	191
	192	status = CUPS_SC_STATUS_OK;
7e86f2f6	193	datalen = (int)(dataptr - data);
82cc1f9a MS	194	break;
82cc1f9a MS	195	}
20fbc903 MS	196
	197	if (!_cupsSNMPStringToOID(data, packet.object_name, CUPS_SNMP_MAX_OID))
	198	{
	199	status = CUPS_SC_STATUS_BAD_MESSAGE;
	200	datalen = 0;
	201	break;
	202	}
	203
	204	status = CUPS_SC_STATUS_IO_ERROR;
	205	datalen = 0;
	206
	207	if (_cupsSNMPWrite(snmp_fd, addr, CUPS_SNMP_VERSION_1,
	208	_cupsSNMPDefaultCommunity(),
	209	command == CUPS_SC_CMD_SNMP_GET ?
	210	CUPS_ASN1_GET_REQUEST :
	211	CUPS_ASN1_GET_NEXT_REQUEST, 1,
	212	packet.object_name))
	213	{
	214	if (_cupsSNMPRead(snmp_fd, &packet, 1.0))
	215	{
7e86f2f6	216	size_t i; /* Looping var */
20fbc903 MS	217
	218
	219	if (!_cupsSNMPOIDToString(packet.object_name, data, sizeof(data)))
	220	{
	221	fputs("DEBUG: Bad OID returned!\n", stderr);
	222	break;
	223	}
	224
	225	datalen = (int)strlen(data) + 1;
	226	dataptr = data + datalen;
	227
	228	switch (packet.object_type)
	229	{
	230	case CUPS_ASN1_BOOLEAN :
7e86f2f6	231	snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%d", packet.object_value.boolean);
7d5824d6	232	datalen += (int)strlen(dataptr);
20fbc903 MS	233	break;
	234
	235	case CUPS_ASN1_INTEGER :
7e86f2f6	236	snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%d",
20fbc903	237	packet.object_value.integer);
7d5824d6	238	datalen += (int)strlen(dataptr);
20fbc903 MS	239	break;
	240
	241	case CUPS_ASN1_BIT_STRING :
	242	case CUPS_ASN1_OCTET_STRING :
7e86f2f6	243	if (packet.object_value.string.num_bytes < (sizeof(data) - (size_t)(dataptr - data)))
d1c13e16	244	i = packet.object_value.string.num_bytes;
ef55b745	245	else
7e86f2f6	246	i = sizeof(data) - (size_t)(dataptr - data);
d1c13e16 MS	247
	248	memcpy(dataptr, packet.object_value.string.bytes, i);
	249
7d5824d6	250	datalen += (int)i;
20fbc903 MS	251	break;
	252
	253	case CUPS_ASN1_OID :
	254	_cupsSNMPOIDToString(packet.object_value.oid, dataptr,
7e86f2f6	255	sizeof(data) - (size_t)(dataptr - data));
7d5824d6	256	datalen += (int)strlen(dataptr);
20fbc903 MS	257	break;
	258
	259	case CUPS_ASN1_HEX_STRING :
	260	for (i = 0;
d1c13e16	261	i < packet.object_value.string.num_bytes &&
20fbc903 MS	262	dataptr < (data + sizeof(data) - 3);
20fbc903 MS	263	i ++, dataptr += 2)
7e86f2f6	264	sprintf(dataptr, "%02X", packet.object_value.string.bytes[i]);
7d5824d6	265	datalen += (int)strlen(dataptr);
20fbc903 MS	266	break;
	267
	268	case CUPS_ASN1_COUNTER :
7e86f2f6	269	snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%u", packet.object_value.counter);
7d5824d6	270	datalen += (int)strlen(dataptr);
20fbc903 MS	271	break;
	272
	273	case CUPS_ASN1_GAUGE :
7e86f2f6	274	snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%u", packet.object_value.gauge);
7d5824d6	275	datalen += (int)strlen(dataptr);
20fbc903 MS	276	break;
	277
	278	case CUPS_ASN1_TIMETICKS :
7e86f2f6	279	snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%u", packet.object_value.timeticks);
7d5824d6	280	datalen += (int)strlen(dataptr);
20fbc903 MS	281	break;
	282
	283	default :
7e86f2f6	284	fprintf(stderr, "DEBUG: Unknown OID value type %02X.\n", packet.object_type);
d1c13e16 MS	285
	286	case CUPS_ASN1_NULL_VALUE :
	287	dataptr[0] = '\0';
20fbc903 MS	288	break;
	289	}
	290
	291	fprintf(stderr, "DEBUG: Returning %s %s\n", data, data + datalen);
	292
d1c13e16	293	status = CUPS_SC_STATUS_OK;
20fbc903 MS	294	}
	295	else
	296	fputs("DEBUG: SNMP read error...\n", stderr);
	297	}
	298	else
	299	fputs("DEBUG: SNMP write error...\n", stderr);
	300	break;
	301	}
	302
	303	status = CUPS_SC_STATUS_NOT_IMPLEMENTED;
	304	datalen = 0;
	305	break;
	306
2adbc9df MS	307	case CUPS_SC_CMD_GET_CONNECTED :
	308	status = CUPS_SC_STATUS_OK;
	309	data[0] = device_fd != -1;
	310	datalen = 1;
	311	break;
	312
7a14d768 MS	313	case CUPS_SC_CMD_GET_DEVICE_ID :
	314	if (snmp_fd >= 0)
	315	{
	316	cups_snmp_t packet; /* Packet from printer */
	317	static const int ppmPrinterIEEE1284DeviceId[] =
	318	{ CUPS_OID_ppmPrinterIEEE1284DeviceId,1,-1 };
	319
20fbc903 MS	320
	321	status = CUPS_SC_STATUS_IO_ERROR;
	322	datalen = 0;
	323
	324	if (_cupsSNMPWrite(snmp_fd, addr, CUPS_SNMP_VERSION_1,
	325	_cupsSNMPDefaultCommunity(),
7a14d768 MS	326	CUPS_ASN1_GET_REQUEST, 1,
	327	ppmPrinterIEEE1284DeviceId))
	328	{
	329	if (_cupsSNMPRead(snmp_fd, &packet, 1.0) &&
	330	packet.object_type == CUPS_ASN1_OCTET_STRING)
	331	{
d1c13e16 MS	332	strlcpy(data, (char *)packet.object_value.string.bytes,
d1c13e16 MS	333	sizeof(data));
7a14d768	334	datalen = (int)strlen(data);
20fbc903	335	status = CUPS_SC_STATUS_OK;
7a14d768 MS	336	}
7a14d768 MS	337	}
20fbc903 MS	338
20fbc903 MS	339	break;
7a14d768 MS	340	}
	341
	342	if ((device_id = getenv("1284DEVICEID")) != NULL)
	343	{
	344	strlcpy(data, device_id, sizeof(data));
	345	datalen = (int)strlen(data);
d1c13e16	346	status = CUPS_SC_STATUS_OK;
7a14d768 MS	347	break;
	348	}
	349
	350	default :
	351	status = CUPS_SC_STATUS_NOT_IMPLEMENTED;
	352	datalen = 0;
	353	break;
	354	}
	355
18ecb428	356	return (cupsSideChannelWrite(command, status, data, datalen, 1.0));
7a14d768	357	}