[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/".
 *
 * This file is subject to the Apple OS-Developed Software exception.
 */

/*
 * 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	12	*
5a1d7a17	13	* This file is subject to the Apple OS-Developed Software exception.
7a14d768 MS	14	*/
	15
	16	/*
	17	* Include necessary headers.
	18	*/
	19
	20	#include "backend-private.h"
	21	#include <limits.h>
5a1d7a17	22	#include <sys/select.h>
7a14d768 MS	23
7a14d768 MS	24
7a14d768 MS	25	/*
	26	* 'backendCheckSideChannel()' - Check the side-channel for pending requests.
	27	*/
	28
7a14d768 MS	29	void
	30	backendCheckSideChannel(
	31	int snmp_fd, /* I - SNMP socket */
	32	http_addr_t addr) / I - Address of device */
	33	{
	34	fd_set input; /* Select input set */
	35	struct timeval timeout; /* Select timeout */
	36
	37
	38	FD_ZERO(&input);
	39	FD_SET(CUPS_SC_FD, &input);
	40
	41	timeout.tv_sec = timeout.tv_usec = 0;
	42
	43	if (select(CUPS_SC_FD + 1, &input, NULL, NULL, &timeout) > 0)
	44	backendNetworkSideCB(-1, -1, snmp_fd, addr, 0);
	45	}
	46
	47
f5cffc18 MS	48	/*
	49	* 'backendLookup()' - Lookup the given host and log addresses.
	50	*/
	51
	52	http_addrlist_t * /* O - List of addresses or NULL */
	53	backendLookup(const char hostname, / I - Hostname */
	54	int port, /* I - Port number */
	55	int cancel) / I - Variable to watch for job cancel */
	56	{
	57	char portname[32], /* Port number as string */
	58	addrname[256]; /* Address as string */
	59	http_addrlist_t addrlist, / List of addresses */
	60	current; / Current address */
	61
	62
	63	/*
	64	* Lookup the address for the named host...
	65	*/
	66
	67	snprintf(portname, sizeof(portname), "%d", port);
	68
	69	fputs("STATE: +connecting-to-device\n", stderr);
	70	fprintf(stderr, "DEBUG: Looking up \"%s\"...\n", hostname);
	71
	72	while ((addrlist = httpAddrGetList(hostname, AF_UNSPEC, portname)) == NULL)
	73	{
	74	_cupsLangPrintFilter(stderr, "INFO", _("Unable to locate printer \"%s\"."), hostname);
	75	sleep(10);
	76
	77	if (getenv("CLASS") != NULL)
	78	{
	79	fputs("STATE: -connecting-to-device\n", stderr);
	80	exit(CUPS_BACKEND_STOP);
	81	}
	82
	83	if (cancel && *cancel)
	84	{
	85	fputs("STATE: -connecting-to-device\n", stderr);
	86	exit(CUPS_BACKEND_OK);
	87	}
	88	}
	89
	90	fputs("STATE: -connecting-to-device\n", stderr);
	91
	92	/*
	93	* Log the addresses we got...
	94	*/
	95
	96	for (current = addrlist; current; current = current->next)
	97	fprintf(stderr, "DEBUG: %s=%s\n", hostname, httpAddrString(&current->addr, addrname, sizeof(addrname)));
	98
	99	/*
	100	* Return...
	101	*/
	102
	103	return (addrlist);
	104	}
	105
	106
7a14d768 MS	107	/*
	108	* 'backendNetworkSideCB()' - Handle common network side-channel commands.
	109	*/
	110
18ecb428	111	int /* O - -1 on error, 0 on success */
7a14d768 MS	112	backendNetworkSideCB(
	113	int print_fd, /* I - Print file or -1 */
	114	int device_fd, /* I - Device file or -1 */
	115	int snmp_fd, /* I - SNMP socket */
	116	http_addr_t addr, / I - Address of device */
	117	int use_bc) /* I - Use back-channel data? */
	118	{
	119	cups_sc_command_t command; /* Request command */
	120	cups_sc_status_t status; /* Request/response status */
dcb445bc	121	char data[65536]; /* Request/response data */
7a14d768 MS	122	int datalen; /* Request/response data size */
	123	const char device_id; / 1284DEVICEID env var */
	124
	125
	126	datalen = sizeof(data);
	127
	128	if (cupsSideChannelRead(&command, &status, data, &datalen, 1.0))
18ecb428	129	return (-1);
7a14d768 MS	130
	131	switch (command)
	132	{
	133	case CUPS_SC_CMD_DRAIN_OUTPUT :
	134	/*
	135	* Our sockets disable the Nagle algorithm and data is sent immediately.
	136	*/
	137
	138	if (device_fd < 0)
	139	status = CUPS_SC_STATUS_NOT_IMPLEMENTED;
	140	else if (backendDrainOutput(print_fd, device_fd))
	141	status = CUPS_SC_STATUS_IO_ERROR;
82cc1f9a	142	else
7a14d768 MS	143	status = CUPS_SC_STATUS_OK;
	144
	145	datalen = 0;
	146	break;
	147
	148	case CUPS_SC_CMD_GET_BIDI :
8b450588	149	status = CUPS_SC_STATUS_OK;
7e86f2f6	150	data[0] = (char)use_bc;
7a14d768 MS	151	datalen = 1;
	152	break;
	153
20fbc903 MS	154	case CUPS_SC_CMD_SNMP_GET :
	155	case CUPS_SC_CMD_SNMP_GET_NEXT :
	156	fprintf(stderr, "DEBUG: CUPS_SC_CMD_SNMP_%s: %d (%s)\n",
	157	command == CUPS_SC_CMD_SNMP_GET ? "GET" : "GET_NEXT", datalen,
	158	data);
	159
	160	if (datalen < 2)
	161	{
	162	status = CUPS_SC_STATUS_BAD_MESSAGE;
	163	datalen = 0;
	164	break;
	165	}
	166
	167	if (snmp_fd >= 0)
	168	{
82cc1f9a	169	char dataptr; / Pointer into data */
20fbc903	170	cups_snmp_t packet; /* Packet from printer */
82cc1f9a	171	const char snmp_value; / CUPS_SNMP_VALUE env var */
20fbc903	172
82cc1f9a MS	173	if ((snmp_value = getenv("CUPS_SNMP_VALUE")) != NULL)
	174	{
	175	const char snmp_count; / CUPS_SNMP_COUNT env var */
	176	int count; /* Repetition count */
	177
	178	if ((snmp_count = getenv("CUPS_SNMP_COUNT")) != NULL)
	179	{
	180	if ((count = atoi(snmp_count)) <= 0)
	181	count = 1;
	182	}
	183	else
	184	count = 1;
	185
	186	for (dataptr = data + strlen(data) + 1;
	187	count > 0 && dataptr < (data + sizeof(data) - 1);
	188	count --, dataptr += strlen(dataptr))
7e86f2f6	189	strlcpy(dataptr, snmp_value, sizeof(data) - (size_t)(dataptr - data));
82cc1f9a MS	190
	191	fprintf(stderr, "DEBUG: Returning %s %s\n", data,
	192	data + strlen(data) + 1);
	193
	194	status = CUPS_SC_STATUS_OK;
7e86f2f6	195	datalen = (int)(dataptr - data);
82cc1f9a MS	196	break;
82cc1f9a MS	197	}
20fbc903 MS	198
	199	if (!_cupsSNMPStringToOID(data, packet.object_name, CUPS_SNMP_MAX_OID))
	200	{
	201	status = CUPS_SC_STATUS_BAD_MESSAGE;
	202	datalen = 0;
	203	break;
	204	}
	205
	206	status = CUPS_SC_STATUS_IO_ERROR;
	207	datalen = 0;
	208
	209	if (_cupsSNMPWrite(snmp_fd, addr, CUPS_SNMP_VERSION_1,
	210	_cupsSNMPDefaultCommunity(),
	211	command == CUPS_SC_CMD_SNMP_GET ?
	212	CUPS_ASN1_GET_REQUEST :
	213	CUPS_ASN1_GET_NEXT_REQUEST, 1,
	214	packet.object_name))
	215	{
	216	if (_cupsSNMPRead(snmp_fd, &packet, 1.0))
	217	{
7e86f2f6	218	size_t i; /* Looping var */
20fbc903 MS	219
	220
	221	if (!_cupsSNMPOIDToString(packet.object_name, data, sizeof(data)))
	222	{
	223	fputs("DEBUG: Bad OID returned!\n", stderr);
	224	break;
	225	}
	226
	227	datalen = (int)strlen(data) + 1;
	228	dataptr = data + datalen;
	229
	230	switch (packet.object_type)
	231	{
	232	case CUPS_ASN1_BOOLEAN :
7e86f2f6	233	snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%d", packet.object_value.boolean);
7d5824d6	234	datalen += (int)strlen(dataptr);
20fbc903 MS	235	break;
	236
	237	case CUPS_ASN1_INTEGER :
7e86f2f6	238	snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%d",
20fbc903	239	packet.object_value.integer);
7d5824d6	240	datalen += (int)strlen(dataptr);
20fbc903 MS	241	break;
	242
	243	case CUPS_ASN1_BIT_STRING :
	244	case CUPS_ASN1_OCTET_STRING :
7e86f2f6	245	if (packet.object_value.string.num_bytes < (sizeof(data) - (size_t)(dataptr - data)))
d1c13e16	246	i = packet.object_value.string.num_bytes;
ef55b745	247	else
7e86f2f6	248	i = sizeof(data) - (size_t)(dataptr - data);
d1c13e16 MS	249
	250	memcpy(dataptr, packet.object_value.string.bytes, i);
	251
7d5824d6	252	datalen += (int)i;
20fbc903 MS	253	break;
	254
	255	case CUPS_ASN1_OID :
	256	_cupsSNMPOIDToString(packet.object_value.oid, dataptr,
7e86f2f6	257	sizeof(data) - (size_t)(dataptr - data));
7d5824d6	258	datalen += (int)strlen(dataptr);
20fbc903 MS	259	break;
	260
	261	case CUPS_ASN1_HEX_STRING :
	262	for (i = 0;
d1c13e16	263	i < packet.object_value.string.num_bytes &&
20fbc903 MS	264	dataptr < (data + sizeof(data) - 3);
20fbc903 MS	265	i ++, dataptr += 2)
7e86f2f6	266	sprintf(dataptr, "%02X", packet.object_value.string.bytes[i]);
7d5824d6	267	datalen += (int)strlen(dataptr);
20fbc903 MS	268	break;
	269
	270	case CUPS_ASN1_COUNTER :
7e86f2f6	271	snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%u", packet.object_value.counter);
7d5824d6	272	datalen += (int)strlen(dataptr);
20fbc903 MS	273	break;
	274
	275	case CUPS_ASN1_GAUGE :
7e86f2f6	276	snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%u", packet.object_value.gauge);
7d5824d6	277	datalen += (int)strlen(dataptr);
20fbc903 MS	278	break;
	279
	280	case CUPS_ASN1_TIMETICKS :
7e86f2f6	281	snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%u", packet.object_value.timeticks);
7d5824d6	282	datalen += (int)strlen(dataptr);
20fbc903 MS	283	break;
	284
	285	default :
7e86f2f6	286	fprintf(stderr, "DEBUG: Unknown OID value type %02X.\n", packet.object_type);
d1c13e16 MS	287
	288	case CUPS_ASN1_NULL_VALUE :
	289	dataptr[0] = '\0';
20fbc903 MS	290	break;
	291	}
	292
	293	fprintf(stderr, "DEBUG: Returning %s %s\n", data, data + datalen);
	294
d1c13e16	295	status = CUPS_SC_STATUS_OK;
20fbc903 MS	296	}
	297	else
	298	fputs("DEBUG: SNMP read error...\n", stderr);
	299	}
	300	else
	301	fputs("DEBUG: SNMP write error...\n", stderr);
	302	break;
	303	}
	304
	305	status = CUPS_SC_STATUS_NOT_IMPLEMENTED;
	306	datalen = 0;
	307	break;
	308
2adbc9df MS	309	case CUPS_SC_CMD_GET_CONNECTED :
	310	status = CUPS_SC_STATUS_OK;
	311	data[0] = device_fd != -1;
	312	datalen = 1;
	313	break;
	314
7a14d768 MS	315	case CUPS_SC_CMD_GET_DEVICE_ID :
	316	if (snmp_fd >= 0)
	317	{
	318	cups_snmp_t packet; /* Packet from printer */
	319	static const int ppmPrinterIEEE1284DeviceId[] =
	320	{ CUPS_OID_ppmPrinterIEEE1284DeviceId,1,-1 };
	321
20fbc903 MS	322
	323	status = CUPS_SC_STATUS_IO_ERROR;
	324	datalen = 0;
	325
	326	if (_cupsSNMPWrite(snmp_fd, addr, CUPS_SNMP_VERSION_1,
	327	_cupsSNMPDefaultCommunity(),
7a14d768 MS	328	CUPS_ASN1_GET_REQUEST, 1,
	329	ppmPrinterIEEE1284DeviceId))
	330	{
	331	if (_cupsSNMPRead(snmp_fd, &packet, 1.0) &&
	332	packet.object_type == CUPS_ASN1_OCTET_STRING)
	333	{
d1c13e16 MS	334	strlcpy(data, (char *)packet.object_value.string.bytes,
d1c13e16 MS	335	sizeof(data));
7a14d768	336	datalen = (int)strlen(data);
20fbc903	337	status = CUPS_SC_STATUS_OK;
7a14d768 MS	338	}
7a14d768 MS	339	}
20fbc903 MS	340
20fbc903 MS	341	break;
7a14d768 MS	342	}
	343
	344	if ((device_id = getenv("1284DEVICEID")) != NULL)
	345	{
	346	strlcpy(data, device_id, sizeof(data));
	347	datalen = (int)strlen(data);
d1c13e16	348	status = CUPS_SC_STATUS_OK;
7a14d768 MS	349	break;
	350	}
	351
	352	default :
	353	status = CUPS_SC_STATUS_NOT_IMPLEMENTED;
	354	datalen = 0;
	355	break;
	356	}
	357
18ecb428	358	return (cupsSideChannelWrite(command, status, data, datalen, 1.0));
7a14d768	359	}