[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.
 *
 * Licensed under Apache License v2.0.  See the file "LICENSE" for more
 * information.
 */

/*
 * 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)
		      snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%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	*
53f8d64f MS	4	* Copyright © 2007-2016 by Apple Inc.
53f8d64f MS	5	* Copyright © 2006-2007 by Easy Software Products, all rights reserved.
7a14d768	6	*
53f8d64f MS	7	* Licensed under Apache License v2.0. See the file "LICENSE" for more
53f8d64f MS	8	* information.
7a14d768 MS	9	*/
	10
	11	/*
	12	* Include necessary headers.
	13	*/
	14
	15	#include "backend-private.h"
	16	#include <limits.h>
5a1d7a17	17	#include <sys/select.h>
7a14d768 MS	18
7a14d768 MS	19
7a14d768 MS	20	/*
	21	* 'backendCheckSideChannel()' - Check the side-channel for pending requests.
	22	*/
	23
7a14d768 MS	24	void
	25	backendCheckSideChannel(
	26	int snmp_fd, /* I - SNMP socket */
	27	http_addr_t addr) / I - Address of device */
	28	{
	29	fd_set input; /* Select input set */
	30	struct timeval timeout; /* Select timeout */
	31
	32
	33	FD_ZERO(&input);
	34	FD_SET(CUPS_SC_FD, &input);
	35
	36	timeout.tv_sec = timeout.tv_usec = 0;
	37
	38	if (select(CUPS_SC_FD + 1, &input, NULL, NULL, &timeout) > 0)
	39	backendNetworkSideCB(-1, -1, snmp_fd, addr, 0);
	40	}
	41
	42
f5cffc18 MS	43	/*
	44	* 'backendLookup()' - Lookup the given host and log addresses.
	45	*/
	46
	47	http_addrlist_t * /* O - List of addresses or NULL */
	48	backendLookup(const char hostname, / I - Hostname */
	49	int port, /* I - Port number */
	50	int cancel) / I - Variable to watch for job cancel */
	51	{
	52	char portname[32], /* Port number as string */
	53	addrname[256]; /* Address as string */
	54	http_addrlist_t addrlist, / List of addresses */
	55	current; / Current address */
	56
	57
	58	/*
	59	* Lookup the address for the named host...
	60	*/
	61
	62	snprintf(portname, sizeof(portname), "%d", port);
	63
	64	fputs("STATE: +connecting-to-device\n", stderr);
	65	fprintf(stderr, "DEBUG: Looking up \"%s\"...\n", hostname);
	66
	67	while ((addrlist = httpAddrGetList(hostname, AF_UNSPEC, portname)) == NULL)
	68	{
	69	_cupsLangPrintFilter(stderr, "INFO", _("Unable to locate printer \"%s\"."), hostname);
	70	sleep(10);
	71
	72	if (getenv("CLASS") != NULL)
	73	{
	74	fputs("STATE: -connecting-to-device\n", stderr);
	75	exit(CUPS_BACKEND_STOP);
	76	}
	77
	78	if (cancel && *cancel)
	79	{
	80	fputs("STATE: -connecting-to-device\n", stderr);
	81	exit(CUPS_BACKEND_OK);
	82	}
	83	}
	84
	85	fputs("STATE: -connecting-to-device\n", stderr);
	86
	87	/*
	88	* Log the addresses we got...
	89	*/
	90
	91	for (current = addrlist; current; current = current->next)
	92	fprintf(stderr, "DEBUG: %s=%s\n", hostname, httpAddrString(&current->addr, addrname, sizeof(addrname)));
	93
	94	/*
	95	* Return...
	96	*/
	97
	98	return (addrlist);
	99	}
	100
	101
7a14d768 MS	102	/*
	103	* 'backendNetworkSideCB()' - Handle common network side-channel commands.
	104	*/
	105
18ecb428	106	int /* O - -1 on error, 0 on success */
7a14d768 MS	107	backendNetworkSideCB(
	108	int print_fd, /* I - Print file or -1 */
	109	int device_fd, /* I - Device file or -1 */
	110	int snmp_fd, /* I - SNMP socket */
	111	http_addr_t addr, / I - Address of device */
	112	int use_bc) /* I - Use back-channel data? */
	113	{
	114	cups_sc_command_t command; /* Request command */
	115	cups_sc_status_t status; /* Request/response status */
dcb445bc	116	char data[65536]; /* Request/response data */
7a14d768 MS	117	int datalen; /* Request/response data size */
	118	const char device_id; / 1284DEVICEID env var */
	119
	120
	121	datalen = sizeof(data);
	122
	123	if (cupsSideChannelRead(&command, &status, data, &datalen, 1.0))
18ecb428	124	return (-1);
7a14d768 MS	125
	126	switch (command)
	127	{
	128	case CUPS_SC_CMD_DRAIN_OUTPUT :
	129	/*
	130	* Our sockets disable the Nagle algorithm and data is sent immediately.
	131	*/
	132
	133	if (device_fd < 0)
	134	status = CUPS_SC_STATUS_NOT_IMPLEMENTED;
	135	else if (backendDrainOutput(print_fd, device_fd))
	136	status = CUPS_SC_STATUS_IO_ERROR;
82cc1f9a	137	else
7a14d768 MS	138	status = CUPS_SC_STATUS_OK;
	139
	140	datalen = 0;
	141	break;
	142
	143	case CUPS_SC_CMD_GET_BIDI :
8b450588	144	status = CUPS_SC_STATUS_OK;
7e86f2f6	145	data[0] = (char)use_bc;
7a14d768 MS	146	datalen = 1;
	147	break;
	148
20fbc903 MS	149	case CUPS_SC_CMD_SNMP_GET :
	150	case CUPS_SC_CMD_SNMP_GET_NEXT :
	151	fprintf(stderr, "DEBUG: CUPS_SC_CMD_SNMP_%s: %d (%s)\n",
	152	command == CUPS_SC_CMD_SNMP_GET ? "GET" : "GET_NEXT", datalen,
	153	data);
	154
	155	if (datalen < 2)
	156	{
	157	status = CUPS_SC_STATUS_BAD_MESSAGE;
	158	datalen = 0;
	159	break;
	160	}
	161
	162	if (snmp_fd >= 0)
	163	{
82cc1f9a	164	char dataptr; / Pointer into data */
20fbc903	165	cups_snmp_t packet; /* Packet from printer */
82cc1f9a	166	const char snmp_value; / CUPS_SNMP_VALUE env var */
20fbc903	167
82cc1f9a MS	168	if ((snmp_value = getenv("CUPS_SNMP_VALUE")) != NULL)
	169	{
	170	const char snmp_count; / CUPS_SNMP_COUNT env var */
	171	int count; /* Repetition count */
	172
	173	if ((snmp_count = getenv("CUPS_SNMP_COUNT")) != NULL)
	174	{
	175	if ((count = atoi(snmp_count)) <= 0)
	176	count = 1;
	177	}
	178	else
	179	count = 1;
	180
	181	for (dataptr = data + strlen(data) + 1;
	182	count > 0 && dataptr < (data + sizeof(data) - 1);
	183	count --, dataptr += strlen(dataptr))
7e86f2f6	184	strlcpy(dataptr, snmp_value, sizeof(data) - (size_t)(dataptr - data));
82cc1f9a MS	185
	186	fprintf(stderr, "DEBUG: Returning %s %s\n", data,
	187	data + strlen(data) + 1);
	188
	189	status = CUPS_SC_STATUS_OK;
7e86f2f6	190	datalen = (int)(dataptr - data);
82cc1f9a MS	191	break;
82cc1f9a MS	192	}
20fbc903 MS	193
	194	if (!_cupsSNMPStringToOID(data, packet.object_name, CUPS_SNMP_MAX_OID))
	195	{
	196	status = CUPS_SC_STATUS_BAD_MESSAGE;
	197	datalen = 0;
	198	break;
	199	}
	200
	201	status = CUPS_SC_STATUS_IO_ERROR;
	202	datalen = 0;
	203
	204	if (_cupsSNMPWrite(snmp_fd, addr, CUPS_SNMP_VERSION_1,
	205	_cupsSNMPDefaultCommunity(),
	206	command == CUPS_SC_CMD_SNMP_GET ?
	207	CUPS_ASN1_GET_REQUEST :
	208	CUPS_ASN1_GET_NEXT_REQUEST, 1,
	209	packet.object_name))
	210	{
	211	if (_cupsSNMPRead(snmp_fd, &packet, 1.0))
	212	{
7e86f2f6	213	size_t i; /* Looping var */
20fbc903 MS	214
	215
	216	if (!_cupsSNMPOIDToString(packet.object_name, data, sizeof(data)))
	217	{
	218	fputs("DEBUG: Bad OID returned!\n", stderr);
	219	break;
	220	}
	221
	222	datalen = (int)strlen(data) + 1;
	223	dataptr = data + datalen;
	224
	225	switch (packet.object_type)
	226	{
	227	case CUPS_ASN1_BOOLEAN :
7e86f2f6	228	snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%d", packet.object_value.boolean);
7d5824d6	229	datalen += (int)strlen(dataptr);
20fbc903 MS	230	break;
	231
	232	case CUPS_ASN1_INTEGER :
7e86f2f6	233	snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%d",
20fbc903	234	packet.object_value.integer);
7d5824d6	235	datalen += (int)strlen(dataptr);
20fbc903 MS	236	break;
	237
	238	case CUPS_ASN1_BIT_STRING :
	239	case CUPS_ASN1_OCTET_STRING :
7e86f2f6	240	if (packet.object_value.string.num_bytes < (sizeof(data) - (size_t)(dataptr - data)))
d1c13e16	241	i = packet.object_value.string.num_bytes;
ef55b745	242	else
7e86f2f6	243	i = sizeof(data) - (size_t)(dataptr - data);
d1c13e16 MS	244
	245	memcpy(dataptr, packet.object_value.string.bytes, i);
	246
7d5824d6	247	datalen += (int)i;
20fbc903 MS	248	break;
	249
	250	case CUPS_ASN1_OID :
	251	_cupsSNMPOIDToString(packet.object_value.oid, dataptr,
7e86f2f6	252	sizeof(data) - (size_t)(dataptr - data));
7d5824d6	253	datalen += (int)strlen(dataptr);
20fbc903 MS	254	break;
	255
	256	case CUPS_ASN1_HEX_STRING :
	257	for (i = 0;
d1c13e16	258	i < packet.object_value.string.num_bytes &&
20fbc903 MS	259	dataptr < (data + sizeof(data) - 3);
20fbc903 MS	260	i ++, dataptr += 2)
064e50fb	261	snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%02X", packet.object_value.string.bytes[i]);
7d5824d6	262	datalen += (int)strlen(dataptr);
20fbc903 MS	263	break;
	264
	265	case CUPS_ASN1_COUNTER :
7e86f2f6	266	snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%u", packet.object_value.counter);
7d5824d6	267	datalen += (int)strlen(dataptr);
20fbc903 MS	268	break;
	269
	270	case CUPS_ASN1_GAUGE :
7e86f2f6	271	snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%u", packet.object_value.gauge);
7d5824d6	272	datalen += (int)strlen(dataptr);
20fbc903 MS	273	break;
	274
	275	case CUPS_ASN1_TIMETICKS :
7e86f2f6	276	snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%u", packet.object_value.timeticks);
7d5824d6	277	datalen += (int)strlen(dataptr);
20fbc903 MS	278	break;
	279
	280	default :
7e86f2f6	281	fprintf(stderr, "DEBUG: Unknown OID value type %02X.\n", packet.object_type);
d1c13e16 MS	282
	283	case CUPS_ASN1_NULL_VALUE :
	284	dataptr[0] = '\0';
20fbc903 MS	285	break;
	286	}
	287
	288	fprintf(stderr, "DEBUG: Returning %s %s\n", data, data + datalen);
	289
d1c13e16	290	status = CUPS_SC_STATUS_OK;
20fbc903 MS	291	}
	292	else
	293	fputs("DEBUG: SNMP read error...\n", stderr);
	294	}
	295	else
	296	fputs("DEBUG: SNMP write error...\n", stderr);
	297	break;
	298	}
	299
	300	status = CUPS_SC_STATUS_NOT_IMPLEMENTED;
	301	datalen = 0;
	302	break;
	303
2adbc9df MS	304	case CUPS_SC_CMD_GET_CONNECTED :
	305	status = CUPS_SC_STATUS_OK;
	306	data[0] = device_fd != -1;
	307	datalen = 1;
	308	break;
	309
7a14d768 MS	310	case CUPS_SC_CMD_GET_DEVICE_ID :
	311	if (snmp_fd >= 0)
	312	{
	313	cups_snmp_t packet; /* Packet from printer */
	314	static const int ppmPrinterIEEE1284DeviceId[] =
	315	{ CUPS_OID_ppmPrinterIEEE1284DeviceId,1,-1 };
	316
20fbc903 MS	317
	318	status = CUPS_SC_STATUS_IO_ERROR;
	319	datalen = 0;
	320
	321	if (_cupsSNMPWrite(snmp_fd, addr, CUPS_SNMP_VERSION_1,
	322	_cupsSNMPDefaultCommunity(),
7a14d768 MS	323	CUPS_ASN1_GET_REQUEST, 1,
	324	ppmPrinterIEEE1284DeviceId))
	325	{
	326	if (_cupsSNMPRead(snmp_fd, &packet, 1.0) &&
	327	packet.object_type == CUPS_ASN1_OCTET_STRING)
	328	{
d1c13e16 MS	329	strlcpy(data, (char *)packet.object_value.string.bytes,
d1c13e16 MS	330	sizeof(data));
7a14d768	331	datalen = (int)strlen(data);
20fbc903	332	status = CUPS_SC_STATUS_OK;
7a14d768 MS	333	}
7a14d768 MS	334	}
20fbc903 MS	335
20fbc903 MS	336	break;
7a14d768 MS	337	}
	338
	339	if ((device_id = getenv("1284DEVICEID")) != NULL)
	340	{
	341	strlcpy(data, device_id, sizeof(data));
	342	datalen = (int)strlen(data);
d1c13e16	343	status = CUPS_SC_STATUS_OK;
7a14d768 MS	344	break;
	345	}
	346
	347	default :
	348	status = CUPS_SC_STATUS_NOT_IMPLEMENTED;
	349	datalen = 0;
	350	break;
	351	}
	352
18ecb428	353	return (cupsSideChannelWrite(command, status, data, datalen, 1.0));
7a14d768	354	}