[thirdparty/cups.git] / scheduler / cups-deviced.c

/*
 * "$Id: cups-deviced.c 5099 2006-02-13 02:46:10Z mike $"
 *
 *   Device scanning mini-daemon for the Common UNIX Printing System (CUPS).
 *
 *   Copyright 1997-2006 by Easy Software Products.
 *
 *   These coded instructions, statements, and computer programs are the
 *   property of Easy Software Products and are protected by Federal
 *   copyright law.  Distribution and use rights are outlined in the file
 *   "LICENSE.txt" which should have been included with this file.  If this
 *   file is missing or damaged please contact Easy Software Products
 *   at:
 *
 *       Attn: CUPS Licensing Information
 *       Easy Software Products
 *       44141 Airport View Drive, Suite 204
 *       Hollywood, Maryland 20636 USA
 *
 *       Voice: (301) 373-9600
 *       EMail: cups-info@cups.org
 *         WWW: http://www.cups.org
 *
 * Contents:
 *
 *   main()            - Scan for devices and return an IPP response.
 *   add_dev()         - Add a new device to the list.
 *   compare_devs()    - Compare device names for sorting.
 *   sigalrm_handler() - Handle alarm signals for backends that get hung
 */

/*
 * Include necessary headers...
 */

#include "util.h"
#include <cups/array.h>
#include <cups/dir.h>


/*
 * Device information structure...
 */

typedef struct
{
  char	device_class[128],		/* Device class */
	device_make_and_model[128],	/* Make and model, if known */
	device_info[128],		/* Device info/description */
	device_uri[1024],		/* Device URI */
	device_id[1024];		/* 1284 Device ID */
} dev_info_t;


/*
 * Local globals...
 */

static int		alarm_tripped;	/* Non-zero if alarm was tripped */
static cups_array_t	*devs;		/* Device info */
static int		normal_user;	/* Normal user ID */


/*
 * Local functions...
 */

static dev_info_t	*add_dev(const char *device_class,
			         const char *device_make_and_model,
				 const char *device_info,
				 const char *device_uri,
				 const char *device_id);
static int		compare_devs(dev_info_t *p0, dev_info_t *p1);
static void		sigalrm_handler(int sig);


/*
 * 'main()' - Scan for devices and return an IPP response.
 *
 * Usage:
 *
 *    cups-deviced request_id limit options
 */

int					/* O - Exit code */
main(int  argc,				/* I - Number of command-line args */
     char *argv[])			/* I - Command-line arguments */
{
  const char	*server_bin;		/* CUPS_SERVERBIN environment variable */
  char		backends[1024];		/* Location of backends */
  int		request_id;		/* Request ID */
  int		count;			/* Number of devices from backend */
  int		compat;			/* Compatibility device? */
  FILE		*fp;			/* Pipe to device backend */
  cups_dir_t	*dir;			/* Directory pointer */
  cups_dentry_t *dent;			/* Directory entry */
  char		filename[1024],		/* Name of backend */
		line[2048],		/* Line from backend */
		dclass[64],		/* Device class */
		uri[1024],		/* Device URI */
		info[128],		/* Device info */
		make_model[256],	/* Make and model */
		device_id[1024];	/* 1284 device ID */
  int		num_options;		/* Number of options */
  cups_option_t	*options;		/* Options */
  const char	*requested;		/* requested-attributes option */
  int		send_class,		/* Send device-class attribute? */
		send_info,		/* Send device-info attribute? */
		send_make_and_model,	/* Send device-make-and-model attribute? */
		send_uri,		/* Send device-uri attribute? */
		send_id;		/* Send device-id attribute? */
  dev_info_t	*dev;			/* Current device */
#if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
  struct sigaction action;		/* Actions for POSIX signals */
#endif /* HAVE_SIGACTION && !HAVE_SIGSET */


  setbuf(stderr, NULL);

 /*
  * Check the command-line...
  */

  if (argc > 1)
    request_id = atoi(argv[1]);
  else
    request_id = 1;

  if (argc != 5)
  {
    fputs("Usage: cups-deviced request-id limit user-id options\n", stderr);

    return (1);
  }

  if (request_id < 1)
  {
    fprintf(stderr, "cups-deviced: Bad request ID %d!\n", request_id);

    return (1);
  }

  normal_user = atoi(argv[3]);
  if (normal_user <= 0)
  {
    fprintf(stderr, "cups-deviced: Bad user %d!\n", normal_user);

    return (1);
  }

  num_options = cupsParseOptions(argv[4], 0, &options);
  requested   = cupsGetOption("requested-attributes", num_options, options);

  if (!requested || strstr(requested, "all"))
  {
    send_class          = 1;
    send_info           = 1;
    send_make_and_model = 1;
    send_uri            = 1;
    send_id             = 1;
  }
  else
  {
    send_class          = strstr(requested, "device-class") != NULL;
    send_info           = strstr(requested, "device-info") != NULL;
    send_make_and_model = strstr(requested, "device-make-and-model") != NULL;
    send_uri            = strstr(requested, "device-uri") != NULL;
    send_id             = strstr(requested, "device-id") != NULL;
  }

 /*
  * Try opening the backend directory...
  */

  if ((server_bin = getenv("CUPS_SERVERBIN")) == NULL)
    server_bin = CUPS_SERVERBIN;

  snprintf(backends, sizeof(backends), "%s/backend", server_bin);

  if ((dir = cupsDirOpen(backends)) == NULL)
  {
    fprintf(stderr, "ERROR: [cups-deviced] Unable to open backend directory "
                    "\"%s\": %s", backends, strerror(errno));

    return (1);
  }

 /*
  * Setup the devices array...
  */

  devs = cupsArrayNew((cups_array_func_t)compare_devs, NULL);

 /*
  * Loop through all of the device backends...
  */

  while ((dent = cupsDirRead(dir)) != NULL)
  {
   /*
    * Skip entries that are not executable files...
    */

    if (!S_ISREG(dent->fileinfo.st_mode) ||
        (dent->fileinfo.st_mode & (S_IRUSR | S_IXUSR)) != (S_IRUSR | S_IXUSR))
      continue;

   /*
    * Change effective users depending on the backend permissions...
    */

    if (!getuid())
    {
     /*
      * Backends without permissions for normal users run as root,
      * all others run as the unprivileged user...
      */

      if (!(dent->fileinfo.st_mode & (S_IRWXG | S_IRWXO)))
        seteuid(0);
      else
        seteuid(normal_user);
    }

   /*
    * Run the backend with no arguments and collect the output...
    */

    snprintf(filename, sizeof(filename), "%s/%s", backends, dent->filename);
    if ((fp = popen(filename, "r")) != NULL)
    {
     /*
      * Set an alarm for the first read from the backend; this avoids
      * problems when a backend is hung getting device information.
      */

#ifdef HAVE_SIGSET /* Use System V signals over POSIX to avoid bugs */
      sigset(SIGALRM, sigalrm_handler);
#elif defined(HAVE_SIGACTION)
      memset(&action, 0, sizeof(action));

      sigemptyset(&action.sa_mask);
      sigaddset(&action.sa_mask, SIGALRM);
      action.sa_handler = sigalrm_handler;
      sigaction(SIGALRM, &action, NULL);
#else
      signal(SIGALRM, sigalrm_handler);
#endif /* HAVE_SIGSET */

      alarm_tripped = 0;
      count         = 0;
      compat        = !strcmp(dent->filename, "smb");

      alarm(30);

      while (fgets(line, sizeof(line), fp) != NULL)
      {
       /*
        * Reset the alarm clock...
	*/

        alarm(30);

       /*
        * Each line is of the form:
	*
	*   class URI "make model" "name" ["1284 device ID"]
	*/

        device_id[0] = '\0';

        if (!strncasecmp(line, "Usage", 5))
	  compat = 1;
        else if (sscanf(line,
	                "%63s%1023s%*[ \t]\"%255[^\"]\"%*[ \t]\"%127[^\"]"
			"%*[ \t]\"%1023[^\"]",
	                dclass, uri, make_model, info, device_id) < 4)
        {
	 /*
	  * Bad format; strip trailing newline and write an error message.
	  */

          if (line[strlen(line) - 1] == '\n')
	    line[strlen(line) - 1] = '\0';

	  fprintf(stderr, "ERROR: [cups-deviced] Bad line from \"%s\": %s\n",
	          dent->filename, line);
          compat = 1;
	  break;
        }
	else
	{
	 /*
	  * Add the device to the array of available devices...
	  */

          dev = add_dev(dclass, make_model, info, uri, device_id);
	  if (!dev)
	  {
            cupsDirClose(dir);
	    return (1);
	  }

          fprintf(stderr, "DEBUG: [cups-deviced] Added device \"%s\"...\n",
	          uri);
	  count ++;
	}
      }

     /*
      * Turn the alarm clock off and close the pipe to the command...
      */

      alarm(0);

      if (alarm_tripped)
        fprintf(stderr, "WARNING: [cups-deviced] Backend \"%s\" did not "
	                "respond within 30 seconds!\n", dent->filename);

      pclose(fp);

     /*
      * Hack for backends that don't support the CUPS 1.1 calling convention:
      * add a network device with the method == backend name.
      */

      if (count == 0 && compat)
      {
	snprintf(line, sizeof(line), "Unknown Network Device (%s)",
	         dent->filename);

        dev = add_dev("network", line, "Unknown", dent->filename, "");
	if (!dev)
	{
          cupsDirClose(dir);
	  return (1);
	}

        fprintf(stderr, "DEBUG: [cups-deviced] Compatibility device "
	                "\"%s\"...\n", dent->filename);
      }
    }
    else
      fprintf(stderr, "WARNING: [cups-deviced] Unable to execute \"%s\" "
                      "backend: %s\n", dent->filename, strerror(errno));
  }

  cupsDirClose(dir);

 /*
  * Switch back to root as needed...
  */

  if (!getuid() && geteuid())
    seteuid(0);

 /*
  * Output the list of devices...
  */

  puts("Content-Type: application/ipp\n");

  cupsdSendIPPHeader(IPP_OK, request_id);
  cupsdSendIPPGroup(IPP_TAG_OPERATION);
  cupsdSendIPPString(IPP_TAG_CHARSET, "attributes-charset", "utf-8");
  cupsdSendIPPString(IPP_TAG_LANGUAGE, "attributes-natural-language", "en-US");

  if ((count = atoi(argv[2])) <= 0)
    count = cupsArrayCount(devs);

  if (count > cupsArrayCount(devs))
    count = cupsArrayCount(devs);

  for (dev = (dev_info_t *)cupsArrayFirst(devs);
       count > 0;
       count --, dev = (dev_info_t *)cupsArrayNext(devs))
  {
   /*
    * Add strings to attributes...
    */

    cupsdSendIPPGroup(IPP_TAG_PRINTER);
    if (send_class)
      cupsdSendIPPString(IPP_TAG_KEYWORD, "device-class", dev->device_class);
    if (send_info)
      cupsdSendIPPString(IPP_TAG_TEXT, "device-info", dev->device_info);
    if (send_make_and_model)
      cupsdSendIPPString(IPP_TAG_TEXT, "device-make-and-model",
                	 dev->device_make_and_model);
    if (send_uri)
      cupsdSendIPPString(IPP_TAG_URI, "device-uri", dev->device_uri);
    if (send_id)
      cupsdSendIPPString(IPP_TAG_TEXT, "device-id", dev->device_id);
  }

  cupsdSendIPPTrailer();

 /*
  * Free the devices array and return...
  */

  for (dev = (dev_info_t *)cupsArrayFirst(devs);
       dev;
       dev = (dev_info_t *)cupsArrayNext(devs))
    free(dev);

  cupsArrayDelete(devs);

  return (0);
}


/*
 * 'add_dev()' - Add a new device to the list.
 */

static dev_info_t *			/* O - New device or NULL on error */
add_dev(
    const char *device_class,		/* I - Device class */
    const char *device_make_and_model,	/* I - Device make and model */
    const char *device_info,		/* I - Device information */
    const char *device_uri,		/* I - Device URI */
    const char *device_id)		/* I - 1284 device ID */
{
  dev_info_t	*dev;			/* New device */


 /*
  * Allocate memory for the device record...
  */

  if ((dev = calloc(1, sizeof(dev_info_t))) == NULL)
  {
    fputs("ERROR: [cups-deviced] Ran out of memory allocating a device!\n",
          stderr);
    return (NULL);
  }

 /*
  * Copy the strings over...
  */

  strlcpy(dev->device_class, device_class, sizeof(dev->device_class));
  strlcpy(dev->device_make_and_model, device_make_and_model,
          sizeof(dev->device_make_and_model));
  strlcpy(dev->device_info, device_info, sizeof(dev->device_info));
  strlcpy(dev->device_uri, device_uri, sizeof(dev->device_uri));
  strlcpy(dev->device_id, device_id, sizeof(dev->device_id));

 /*
  * Add the device to the array and return...
  */

  cupsArrayAdd(devs, dev);

  return (dev);
}


/*
 * 'compare_devs()' - Compare device names for sorting.
 */

static int				/* O - Result of comparison */
compare_devs(dev_info_t *d0,		/* I - First device */
             dev_info_t *d1)		/* I - Second device */
{
  int		diff;			/* Difference between strings */


 /*
  * Sort devices by device-info, device-class, and device-uri...
  */

  if ((diff = cupsdCompareNames(d0->device_info, d1->device_info)) != 0)
    return (diff);
  else if ((diff = strcasecmp(d0->device_class, d1->device_class)) != 0)
    return (diff);
  else
    return (strcasecmp(d0->device_uri, d1->device_uri));
}


/*
 * 'sigalrm_handler()' - Handle alarm signals for backends that get hung
 *                       trying to list the available devices...
 */

static void
sigalrm_handler(int sig)		/* I - Signal number */
{
  (void)sig; /* remove compiler warnings... */

  alarm_tripped = 1;
}


/*
 * End of "$Id: cups-deviced.c 5099 2006-02-13 02:46:10Z mike $".
 */
Commit	Line	Data
ef416fc2	1	/*
bd7854cb	2	* "$Id: cups-deviced.c 5099 2006-02-13 02:46:10Z mike $"
ef416fc2	3	*
	4	* Device scanning mini-daemon for the Common UNIX Printing System (CUPS).
	5	*
bd7854cb	6	* Copyright 1997-2006 by Easy Software Products.
ef416fc2	7	*
	8	* These coded instructions, statements, and computer programs are the
	9	* property of Easy Software Products and are protected by Federal
	10	* copyright law. Distribution and use rights are outlined in the file
	11	* "LICENSE.txt" which should have been included with this file. If this
	12	* file is missing or damaged please contact Easy Software Products
	13	* at:
	14	*
	15	* Attn: CUPS Licensing Information
	16	* Easy Software Products
	17	* 44141 Airport View Drive, Suite 204
	18	* Hollywood, Maryland 20636 USA
	19	*
	20	* Voice: (301) 373-9600
	21	* EMail: cups-info@cups.org
	22	* WWW: http://www.cups.org
	23	*
	24	* Contents:
	25	*
	26	* main() - Scan for devices and return an IPP response.
	27	* add_dev() - Add a new device to the list.
	28	* compare_devs() - Compare device names for sorting.
	29	* sigalrm_handler() - Handle alarm signals for backends that get hung
	30	*/
	31
	32	/*
	33	* Include necessary headers...
	34	*/
	35
	36	#include "util.h"
	37	#include <cups/array.h>
	38	#include <cups/dir.h>
	39
	40
	41	/*
	42	* Device information structure...
	43	*/
	44
	45	typedef struct
	46	{
	47	char device_class[128], /* Device class */
	48	device_make_and_model[128], /* Make and model, if known */
	49	device_info[128], /* Device info/description */
	50	device_uri[1024], /* Device URI */
	51	device_id[1024]; /* 1284 Device ID */
	52	} dev_info_t;
	53
	54
	55	/*
	56	* Local globals...
	57	*/
	58
	59	static int alarm_tripped; /* Non-zero if alarm was tripped */
	60	static cups_array_t devs; / Device info */
e00b005a	61	static int normal_user; /* Normal user ID */
ef416fc2	62
	63
	64	/*
	65	* Local functions...
	66	*/
	67
	68	static dev_info_t add_dev(const char device_class,
	69	const char *device_make_and_model,
	70	const char *device_info,
	71	const char *device_uri,
	72	const char *device_id);
	73	static int compare_devs(dev_info_t p0, dev_info_t p1);
	74	static void sigalrm_handler(int sig);
	75
	76
	77	/*
	78	* 'main()' - Scan for devices and return an IPP response.
	79	*
	80	* Usage:
	81	*
	82	* cups-deviced request_id limit options
	83	*/
	84
	85	int /* O - Exit code */
	86	main(int argc, /* I - Number of command-line args */
	87	char argv[]) / I - Command-line arguments */
	88	{
	89	const char server_bin; / CUPS_SERVERBIN environment variable */
	90	char backends[1024]; /* Location of backends */
e00b005a	91	int request_id; /* Request ID */
ef416fc2	92	int count; /* Number of devices from backend */
	93	int compat; /* Compatibility device? */
	94	FILE fp; / Pipe to device backend */
	95	cups_dir_t dir; / Directory pointer */
	96	cups_dentry_t dent; / Directory entry */
	97	char filename[1024], /* Name of backend */
	98	line[2048], /* Line from backend */
	99	dclass[64], /* Device class */
	100	uri[1024], /* Device URI */
	101	info[128], /* Device info */
	102	make_model[256], /* Make and model */
	103	device_id[1024]; /* 1284 device ID */
	104	int num_options; /* Number of options */
	105	cups_option_t options; / Options */
	106	const char requested; / requested-attributes option */
	107	int send_class, /* Send device-class attribute? */
	108	send_info, /* Send device-info attribute? */
	109	send_make_and_model, /* Send device-make-and-model attribute? */
	110	send_uri, /* Send device-uri attribute? */
	111	send_id; /* Send device-id attribute? */
	112	dev_info_t dev; / Current device */
	113	#if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
	114	struct sigaction action; /* Actions for POSIX signals */
	115	#endif /* HAVE_SIGACTION && !HAVE_SIGSET */
	116
	117
e00b005a	118	setbuf(stderr, NULL);
e00b005a	119
ef416fc2	120	/*
	121	* Check the command-line...
	122	*/
	123
e00b005a	124	if (argc > 1)
	125	request_id = atoi(argv[1]);
	126	else
	127	request_id = 1;
	128
	129	if (argc != 5)
	130	{
	131	fputs("Usage: cups-deviced request-id limit user-id options\n", stderr);
	132
e00b005a	133	return (1);
	134	}
	135
	136	if (request_id < 1)
ef416fc2	137	{
e00b005a	138	fprintf(stderr, "cups-deviced: Bad request ID %d!\n", request_id);
e00b005a	139
ef416fc2	140	return (1);
	141	}
	142
e00b005a	143	normal_user = atoi(argv[3]);
	144	if (normal_user <= 0)
	145	{
	146	fprintf(stderr, "cups-deviced: Bad user %d!\n", normal_user);
	147
e00b005a	148	return (1);
	149	}
	150
	151	num_options = cupsParseOptions(argv[4], 0, &options);
ef416fc2	152	requested = cupsGetOption("requested-attributes", num_options, options);
	153
	154	if (!requested \|\| strstr(requested, "all"))
	155	{
	156	send_class = 1;
	157	send_info = 1;
	158	send_make_and_model = 1;
	159	send_uri = 1;
	160	send_id = 1;
	161	}
	162	else
	163	{
	164	send_class = strstr(requested, "device-class") != NULL;
	165	send_info = strstr(requested, "device-info") != NULL;
	166	send_make_and_model = strstr(requested, "device-make-and-model") != NULL;
	167	send_uri = strstr(requested, "device-uri") != NULL;
	168	send_id = strstr(requested, "device-id") != NULL;
	169	}
	170
	171	/*
	172	* Try opening the backend directory...
	173	*/
	174
	175	if ((server_bin = getenv("CUPS_SERVERBIN")) == NULL)
	176	server_bin = CUPS_SERVERBIN;
	177
	178	snprintf(backends, sizeof(backends), "%s/backend", server_bin);
	179
	180	if ((dir = cupsDirOpen(backends)) == NULL)
	181	{
e00b005a	182	fprintf(stderr, "ERROR: [cups-deviced] Unable to open backend directory "
	183	"\"%s\": %s", backends, strerror(errno));
	184
ef416fc2	185	return (1);
	186	}
	187
	188	/*
	189	* Setup the devices array...
	190	*/
	191
	192	devs = cupsArrayNew((cups_array_func_t)compare_devs, NULL);
	193
	194	/*
	195	* Loop through all of the device backends...
	196	*/
	197
	198	while ((dent = cupsDirRead(dir)) != NULL)
	199	{
e00b005a	200	/*
	201	* Skip entries that are not executable files...
	202	*/
	203
	204	if (!S_ISREG(dent->fileinfo.st_mode) \|\|
	205	(dent->fileinfo.st_mode & (S_IRUSR \| S_IXUSR)) != (S_IRUSR \| S_IXUSR))
	206	continue;
	207
	208	/*
	209	* Change effective users depending on the backend permissions...
	210	*/
	211
	212	if (!getuid())
	213	{
	214	/*
	215	* Backends without permissions for normal users run as root,
	216	* all others run as the unprivileged user...
	217	*/
	218
	219	if (!(dent->fileinfo.st_mode & (S_IRWXG \| S_IRWXO)))
	220	seteuid(0);
	221	else
	222	seteuid(normal_user);
	223	}
	224
ef416fc2	225	/*
	226	* Run the backend with no arguments and collect the output...
	227	*/
	228
	229	snprintf(filename, sizeof(filename), "%s/%s", backends, dent->filename);
	230	if ((fp = popen(filename, "r")) != NULL)
	231	{
	232	/*
	233	* Set an alarm for the first read from the backend; this avoids
	234	* problems when a backend is hung getting device information.
	235	*/
	236
	237	#ifdef HAVE_SIGSET /* Use System V signals over POSIX to avoid bugs */
	238	sigset(SIGALRM, sigalrm_handler);
	239	#elif defined(HAVE_SIGACTION)
	240	memset(&action, 0, sizeof(action));
	241
	242	sigemptyset(&action.sa_mask);
	243	sigaddset(&action.sa_mask, SIGALRM);
	244	action.sa_handler = sigalrm_handler;
	245	sigaction(SIGALRM, &action, NULL);
	246	#else
	247	signal(SIGALRM, sigalrm_handler);
	248	#endif /* HAVE_SIGSET */
	249
	250	alarm_tripped = 0;
	251	count = 0;
	252	compat = !strcmp(dent->filename, "smb");
	253
	254	alarm(30);
	255
	256	while (fgets(line, sizeof(line), fp) != NULL)
	257	{
	258	/*
	259	* Reset the alarm clock...
	260	*/
	261
	262	alarm(30);
	263
	264	/*
	265	* Each line is of the form:
	266	*
	267	* class URI "make model" "name" ["1284 device ID"]
	268	*/
	269
	270	device_id[0] = '\0';
	271
	272	if (!strncasecmp(line, "Usage", 5))
	273	compat = 1;
	274	else if (sscanf(line,
	275	"%63s%1023s%[ \t]\"%255[^\"]\"%[ \t]\"%127[^\"]"
	276	"%*[ \t]\"%1023[^\"]",
	277	dclass, uri, make_model, info, device_id) < 4)
	278	{
	279	/*
	280	* Bad format; strip trailing newline and write an error message.
	281	*/
	282
	283	if (line[strlen(line) - 1] == '\n')
	284	line[strlen(line) - 1] = '\0';
	285
	286	fprintf(stderr, "ERROR: [cups-deviced] Bad line from \"%s\": %s\n",
	287	dent->filename, line);
	288	compat = 1;
289	break;
290	}
291	else
292	{
293	/*
294	* Add the device to the array of available devices...
295	*/
296
297	dev = add_dev(dclass, make_model, info, uri, device_id);
298	if (!dev)
299	{
300	cupsDirClose(dir);
301	return (1);
302	}
303
e00b005a	304	fprintf(stderr, "DEBUG: [cups-deviced] Added device \"%s\"...\n",
e00b005a	305	uri);
ef416fc2	306	count ++;
	307	}
	308	}
	309
	310	/*
	311	* Turn the alarm clock off and close the pipe to the command...
	312	*/
	313
	314	alarm(0);
	315
	316	if (alarm_tripped)
e00b005a	317	fprintf(stderr, "WARNING: [cups-deviced] Backend \"%s\" did not "
e00b005a	318	"respond within 30 seconds!\n", dent->filename);
ef416fc2	319
	320	pclose(fp);
	321
	322	/*
	323	* Hack for backends that don't support the CUPS 1.1 calling convention:
	324	* add a network device with the method == backend name.
	325	*/
	326
	327	if (count == 0 && compat)
	328	{
	329	snprintf(line, sizeof(line), "Unknown Network Device (%s)",
	330	dent->filename);
	331
	332	dev = add_dev("network", line, "Unknown", dent->filename, "");
	333	if (!dev)
	334	{
	335	cupsDirClose(dir);
	336	return (1);
	337	}
	338
e00b005a	339	fprintf(stderr, "DEBUG: [cups-deviced] Compatibility device "
e00b005a	340	"\"%s\"...\n", dent->filename);
ef416fc2	341	}
	342	}
	343	else
e00b005a	344	fprintf(stderr, "WARNING: [cups-deviced] Unable to execute \"%s\" "
e00b005a	345	"backend: %s\n", dent->filename, strerror(errno));
ef416fc2	346	}
	347
	348	cupsDirClose(dir);
	349
e00b005a	350	/*
	351	* Switch back to root as needed...
	352	*/
	353
	354	if (!getuid() && geteuid())
	355	seteuid(0);
	356
ef416fc2	357	/*
	358	* Output the list of devices...
	359	*/
	360
	361	puts("Content-Type: application/ipp\n");
	362
e00b005a	363	cupsdSendIPPHeader(IPP_OK, request_id);
ef416fc2	364	cupsdSendIPPGroup(IPP_TAG_OPERATION);
	365	cupsdSendIPPString(IPP_TAG_CHARSET, "attributes-charset", "utf-8");
	366	cupsdSendIPPString(IPP_TAG_LANGUAGE, "attributes-natural-language", "en-US");
	367
	368	if ((count = atoi(argv[2])) <= 0)
	369	count = cupsArrayCount(devs);
	370
	371	if (count > cupsArrayCount(devs))
	372	count = cupsArrayCount(devs);
	373
	374	for (dev = (dev_info_t *)cupsArrayFirst(devs);
	375	count > 0;
	376	count --, dev = (dev_info_t *)cupsArrayNext(devs))
	377	{
	378	/*
	379	* Add strings to attributes...
	380	*/
	381
	382	cupsdSendIPPGroup(IPP_TAG_PRINTER);
	383	if (send_class)
	384	cupsdSendIPPString(IPP_TAG_KEYWORD, "device-class", dev->device_class);
	385	if (send_info)
	386	cupsdSendIPPString(IPP_TAG_TEXT, "device-info", dev->device_info);
	387	if (send_make_and_model)
	388	cupsdSendIPPString(IPP_TAG_TEXT, "device-make-and-model",
	389	dev->device_make_and_model);
	390	if (send_uri)
	391	cupsdSendIPPString(IPP_TAG_URI, "device-uri", dev->device_uri);
	392	if (send_id)
	393	cupsdSendIPPString(IPP_TAG_TEXT, "device-id", dev->device_id);
	394	}
	395
	396	cupsdSendIPPTrailer();
	397
	398	/*
	399	* Free the devices array and return...
	400	*/
	401
	402	for (dev = (dev_info_t *)cupsArrayFirst(devs);
	403	dev;
	404	dev = (dev_info_t *)cupsArrayNext(devs))
	405	free(dev);
	406
	407	cupsArrayDelete(devs);
	408
	409	return (0);
	410	}
	411
	412
	413	/*
	414	* 'add_dev()' - Add a new device to the list.
	415	*/
	416
	417	static dev_info_t * /* O - New device or NULL on error */
	418	add_dev(
	419	const char device_class, / I - Device class */
	420	const char device_make_and_model, / I - Device make and model */
	421	const char device_info, / I - Device information */
	422	const char device_uri, / I - Device URI */
	423	const char device_id) / I - 1284 device ID */
	424	{
	425	dev_info_t dev; / New device */
	426
	427
428	/*
429	* Allocate memory for the device record...
430	*/
431
432	if ((dev = calloc(1, sizeof(dev_info_t))) == NULL)
433	{
434	fputs("ERROR: [cups-deviced] Ran out of memory allocating a device!\n",
435	stderr);
436	return (NULL);
437	}
438
439	/*
440	* Copy the strings over...
441	*/
442
443	strlcpy(dev->device_class, device_class, sizeof(dev->device_class));
444	strlcpy(dev->device_make_and_model, device_make_and_model,
445	sizeof(dev->device_make_and_model));
446	strlcpy(dev->device_info, device_info, sizeof(dev->device_info));
447	strlcpy(dev->device_uri, device_uri, sizeof(dev->device_uri));
448	strlcpy(dev->device_id, device_id, sizeof(dev->device_id));
449
450	/*
451	* Add the device to the array and return...
452	*/
453
454	cupsArrayAdd(devs, dev);
455
456	return (dev);
457	}
458
459
460	/*
461	* 'compare_devs()' - Compare device names for sorting.
462	*/
463
464	static int /* O - Result of comparison */
465	compare_devs(dev_info_t d0, / I - First device */
466	dev_info_t d1) / I - Second device */
467	{
468	int diff; /* Difference between strings */
469
470
471	/*
472	* Sort devices by device-info, device-class, and device-uri...
473	*/
474
475	if ((diff = cupsdCompareNames(d0->device_info, d1->device_info)) != 0)
476	return (diff);
477	else if ((diff = strcasecmp(d0->device_class, d1->device_class)) != 0)
478	return (diff);
479	else
480	return (strcasecmp(d0->device_uri, d1->device_uri));
481	}
482
483
484	/*
485	* 'sigalrm_handler()' - Handle alarm signals for backends that get hung
486	* trying to list the available devices...
487	*/
488
489	static void
490	sigalrm_handler(int sig) /* I - Signal number */
491	{
492	(void)sig; /* remove compiler warnings... */
493
494	alarm_tripped = 1;
495	}
496
497
498	/*
bd7854cb	499	* End of "$Id: cups-deviced.c 5099 2006-02-13 02:46:10Z mike $".
ef416fc2	500	*/