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

/*
 * "$Id: cups-deviced.c 5194 2006-02-27 20:57:07Z 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>

#ifdef __hpux
#  define seteuid(uid) setresuid(-1, (uid), -1)
#endif /* __hpux */


/*
 * 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 5194 2006-02-27 20:57:07Z mike $".
 */
Commit	Line	Data
ef416fc2	1	/*
b423cd4c	2	* "$Id: cups-deviced.c 5194 2006-02-27 20:57:07Z 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
b423cd4c	40	#ifdef __hpux
	41	# define seteuid(uid) setresuid(-1, (uid), -1)
	42	#endif /* __hpux */
	43
ef416fc2	44
	45	/*
	46	* Device information structure...
	47	*/
	48
	49	typedef struct
	50	{
	51	char device_class[128], /* Device class */
	52	device_make_and_model[128], /* Make and model, if known */
	53	device_info[128], /* Device info/description */
	54	device_uri[1024], /* Device URI */
	55	device_id[1024]; /* 1284 Device ID */
	56	} dev_info_t;
	57
	58
	59	/*
	60	* Local globals...
	61	*/
	62
	63	static int alarm_tripped; /* Non-zero if alarm was tripped */
	64	static cups_array_t devs; / Device info */
e00b005a	65	static int normal_user; /* Normal user ID */
ef416fc2	66
	67
	68	/*
	69	* Local functions...
	70	*/
	71
	72	static dev_info_t add_dev(const char device_class,
	73	const char *device_make_and_model,
	74	const char *device_info,
	75	const char *device_uri,
	76	const char *device_id);
	77	static int compare_devs(dev_info_t p0, dev_info_t p1);
	78	static void sigalrm_handler(int sig);
	79
	80
	81	/*
	82	* 'main()' - Scan for devices and return an IPP response.
	83	*
	84	* Usage:
	85	*
	86	* cups-deviced request_id limit options
	87	*/
	88
	89	int /* O - Exit code */
	90	main(int argc, /* I - Number of command-line args */
	91	char argv[]) / I - Command-line arguments */
	92	{
	93	const char server_bin; / CUPS_SERVERBIN environment variable */
	94	char backends[1024]; /* Location of backends */
e00b005a	95	int request_id; /* Request ID */
ef416fc2	96	int count; /* Number of devices from backend */
	97	int compat; /* Compatibility device? */
	98	FILE fp; / Pipe to device backend */
	99	cups_dir_t dir; / Directory pointer */
	100	cups_dentry_t dent; / Directory entry */
	101	char filename[1024], /* Name of backend */
	102	line[2048], /* Line from backend */
	103	dclass[64], /* Device class */
	104	uri[1024], /* Device URI */
	105	info[128], /* Device info */
	106	make_model[256], /* Make and model */
	107	device_id[1024]; /* 1284 device ID */
	108	int num_options; /* Number of options */
	109	cups_option_t options; / Options */
	110	const char requested; / requested-attributes option */
	111	int send_class, /* Send device-class attribute? */
	112	send_info, /* Send device-info attribute? */
	113	send_make_and_model, /* Send device-make-and-model attribute? */
	114	send_uri, /* Send device-uri attribute? */
	115	send_id; /* Send device-id attribute? */
	116	dev_info_t dev; / Current device */
	117	#if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
	118	struct sigaction action; /* Actions for POSIX signals */
	119	#endif /* HAVE_SIGACTION && !HAVE_SIGSET */
	120
	121
e00b005a	122	setbuf(stderr, NULL);
e00b005a	123
ef416fc2	124	/*
	125	* Check the command-line...
	126	*/
	127
e00b005a	128	if (argc > 1)
	129	request_id = atoi(argv[1]);
	130	else
	131	request_id = 1;
	132
	133	if (argc != 5)
	134	{
	135	fputs("Usage: cups-deviced request-id limit user-id options\n", stderr);
	136
e00b005a	137	return (1);
	138	}
	139
	140	if (request_id < 1)
ef416fc2	141	{
e00b005a	142	fprintf(stderr, "cups-deviced: Bad request ID %d!\n", request_id);
e00b005a	143
ef416fc2	144	return (1);
	145	}
	146
e00b005a	147	normal_user = atoi(argv[3]);
	148	if (normal_user <= 0)
	149	{
	150	fprintf(stderr, "cups-deviced: Bad user %d!\n", normal_user);
	151
e00b005a	152	return (1);
	153	}
	154
	155	num_options = cupsParseOptions(argv[4], 0, &options);
ef416fc2	156	requested = cupsGetOption("requested-attributes", num_options, options);
	157
	158	if (!requested \|\| strstr(requested, "all"))
	159	{
	160	send_class = 1;
	161	send_info = 1;
	162	send_make_and_model = 1;
	163	send_uri = 1;
	164	send_id = 1;
	165	}
	166	else
	167	{
	168	send_class = strstr(requested, "device-class") != NULL;
	169	send_info = strstr(requested, "device-info") != NULL;
	170	send_make_and_model = strstr(requested, "device-make-and-model") != NULL;
	171	send_uri = strstr(requested, "device-uri") != NULL;
	172	send_id = strstr(requested, "device-id") != NULL;
	173	}
	174
	175	/*
	176	* Try opening the backend directory...
	177	*/
	178
	179	if ((server_bin = getenv("CUPS_SERVERBIN")) == NULL)
	180	server_bin = CUPS_SERVERBIN;
	181
	182	snprintf(backends, sizeof(backends), "%s/backend", server_bin);
	183
	184	if ((dir = cupsDirOpen(backends)) == NULL)
	185	{
e00b005a	186	fprintf(stderr, "ERROR: [cups-deviced] Unable to open backend directory "
	187	"\"%s\": %s", backends, strerror(errno));
	188
ef416fc2	189	return (1);
	190	}
	191
	192	/*
	193	* Setup the devices array...
	194	*/
	195
	196	devs = cupsArrayNew((cups_array_func_t)compare_devs, NULL);
	197
	198	/*
	199	* Loop through all of the device backends...
	200	*/
	201
	202	while ((dent = cupsDirRead(dir)) != NULL)
	203	{
e00b005a	204	/*
	205	* Skip entries that are not executable files...
	206	*/
	207
	208	if (!S_ISREG(dent->fileinfo.st_mode) \|\|
	209	(dent->fileinfo.st_mode & (S_IRUSR \| S_IXUSR)) != (S_IRUSR \| S_IXUSR))
	210	continue;
	211
	212	/*
	213	* Change effective users depending on the backend permissions...
	214	*/
	215
	216	if (!getuid())
	217	{
	218	/*
	219	* Backends without permissions for normal users run as root,
	220	* all others run as the unprivileged user...
	221	*/
	222
	223	if (!(dent->fileinfo.st_mode & (S_IRWXG \| S_IRWXO)))
	224	seteuid(0);
	225	else
	226	seteuid(normal_user);
	227	}
	228
ef416fc2	229	/*
	230	* Run the backend with no arguments and collect the output...
	231	*/
	232
	233	snprintf(filename, sizeof(filename), "%s/%s", backends, dent->filename);
	234	if ((fp = popen(filename, "r")) != NULL)
	235	{
	236	/*
	237	* Set an alarm for the first read from the backend; this avoids
	238	* problems when a backend is hung getting device information.
	239	*/
	240
	241	#ifdef HAVE_SIGSET /* Use System V signals over POSIX to avoid bugs */
	242	sigset(SIGALRM, sigalrm_handler);
	243	#elif defined(HAVE_SIGACTION)
	244	memset(&action, 0, sizeof(action));
	245
	246	sigemptyset(&action.sa_mask);
	247	sigaddset(&action.sa_mask, SIGALRM);
	248	action.sa_handler = sigalrm_handler;
	249	sigaction(SIGALRM, &action, NULL);
	250	#else
	251	signal(SIGALRM, sigalrm_handler);
	252	#endif /* HAVE_SIGSET */
	253
	254	alarm_tripped = 0;
	255	count = 0;
	256	compat = !strcmp(dent->filename, "smb");
	257
	258	alarm(30);
	259
	260	while (fgets(line, sizeof(line), fp) != NULL)
	261	{
	262	/*
	263	* Reset the alarm clock...
	264	*/
	265
	266	alarm(30);
	267
	268	/*
	269	* Each line is of the form:
	270	*
	271	* class URI "make model" "name" ["1284 device ID"]
	272	*/
	273
	274	device_id[0] = '\0';
	275
	276	if (!strncasecmp(line, "Usage", 5))
	277	compat = 1;
	278	else if (sscanf(line,
	279	"%63s%1023s%[ \t]\"%255[^\"]\"%[ \t]\"%127[^\"]"
	280	"%*[ \t]\"%1023[^\"]",
	281	dclass, uri, make_model, info, device_id) < 4)
	282	{
	283	/*
	284	* Bad format; strip trailing newline and write an error message.
	285	*/
	286
	287	if (line[strlen(line) - 1] == '\n')
	288	line[strlen(line) - 1] = '\0';
	289
	290	fprintf(stderr, "ERROR: [cups-deviced] Bad line from \"%s\": %s\n",
	291	dent->filename, line);
	292	compat = 1;
293	break;
294	}
295	else
296	{
297	/*
298	* Add the device to the array of available devices...
299	*/
300
301	dev = add_dev(dclass, make_model, info, uri, device_id);
302	if (!dev)
303	{
304	cupsDirClose(dir);
305	return (1);
306	}
307
e00b005a	308	fprintf(stderr, "DEBUG: [cups-deviced] Added device \"%s\"...\n",
e00b005a	309	uri);
ef416fc2	310	count ++;
	311	}
	312	}
	313
	314	/*
	315	* Turn the alarm clock off and close the pipe to the command...
	316	*/
	317
	318	alarm(0);
	319
	320	if (alarm_tripped)
e00b005a	321	fprintf(stderr, "WARNING: [cups-deviced] Backend \"%s\" did not "
e00b005a	322	"respond within 30 seconds!\n", dent->filename);
ef416fc2	323
	324	pclose(fp);
	325
	326	/*
	327	* Hack for backends that don't support the CUPS 1.1 calling convention:
	328	* add a network device with the method == backend name.
	329	*/
	330
	331	if (count == 0 && compat)
	332	{
	333	snprintf(line, sizeof(line), "Unknown Network Device (%s)",
	334	dent->filename);
	335
	336	dev = add_dev("network", line, "Unknown", dent->filename, "");
	337	if (!dev)
	338	{
	339	cupsDirClose(dir);
	340	return (1);
	341	}
	342
e00b005a	343	fprintf(stderr, "DEBUG: [cups-deviced] Compatibility device "
e00b005a	344	"\"%s\"...\n", dent->filename);
ef416fc2	345	}
	346	}
	347	else
e00b005a	348	fprintf(stderr, "WARNING: [cups-deviced] Unable to execute \"%s\" "
e00b005a	349	"backend: %s\n", dent->filename, strerror(errno));
ef416fc2	350	}
	351
	352	cupsDirClose(dir);
	353
e00b005a	354	/*
	355	* Switch back to root as needed...
	356	*/
	357
	358	if (!getuid() && geteuid())
	359	seteuid(0);
	360
ef416fc2	361	/*
	362	* Output the list of devices...
	363	*/
	364
	365	puts("Content-Type: application/ipp\n");
	366
e00b005a	367	cupsdSendIPPHeader(IPP_OK, request_id);
ef416fc2	368	cupsdSendIPPGroup(IPP_TAG_OPERATION);
	369	cupsdSendIPPString(IPP_TAG_CHARSET, "attributes-charset", "utf-8");
	370	cupsdSendIPPString(IPP_TAG_LANGUAGE, "attributes-natural-language", "en-US");
	371
	372	if ((count = atoi(argv[2])) <= 0)
	373	count = cupsArrayCount(devs);
	374
	375	if (count > cupsArrayCount(devs))
	376	count = cupsArrayCount(devs);
	377
	378	for (dev = (dev_info_t *)cupsArrayFirst(devs);
	379	count > 0;
	380	count --, dev = (dev_info_t *)cupsArrayNext(devs))
	381	{
	382	/*
	383	* Add strings to attributes...
	384	*/
	385
	386	cupsdSendIPPGroup(IPP_TAG_PRINTER);
	387	if (send_class)
	388	cupsdSendIPPString(IPP_TAG_KEYWORD, "device-class", dev->device_class);
	389	if (send_info)
	390	cupsdSendIPPString(IPP_TAG_TEXT, "device-info", dev->device_info);
	391	if (send_make_and_model)
	392	cupsdSendIPPString(IPP_TAG_TEXT, "device-make-and-model",
	393	dev->device_make_and_model);
	394	if (send_uri)
	395	cupsdSendIPPString(IPP_TAG_URI, "device-uri", dev->device_uri);
	396	if (send_id)
	397	cupsdSendIPPString(IPP_TAG_TEXT, "device-id", dev->device_id);
	398	}
	399
	400	cupsdSendIPPTrailer();
	401
	402	/*
	403	* Free the devices array and return...
	404	*/
	405
	406	for (dev = (dev_info_t *)cupsArrayFirst(devs);
	407	dev;
	408	dev = (dev_info_t *)cupsArrayNext(devs))
	409	free(dev);
	410
	411	cupsArrayDelete(devs);
	412
	413	return (0);
	414	}
	415
	416
	417	/*
	418	* 'add_dev()' - Add a new device to the list.
	419	*/
	420
	421	static dev_info_t * /* O - New device or NULL on error */
	422	add_dev(
	423	const char device_class, / I - Device class */
	424	const char device_make_and_model, / I - Device make and model */
	425	const char device_info, / I - Device information */
	426	const char device_uri, / I - Device URI */
	427	const char device_id) / I - 1284 device ID */
	428	{
	429	dev_info_t dev; / New device */
	430
	431
432	/*
433	* Allocate memory for the device record...
434	*/
435
436	if ((dev = calloc(1, sizeof(dev_info_t))) == NULL)
437	{
438	fputs("ERROR: [cups-deviced] Ran out of memory allocating a device!\n",
439	stderr);
440	return (NULL);
441	}
442
443	/*
444	* Copy the strings over...
445	*/
446
447	strlcpy(dev->device_class, device_class, sizeof(dev->device_class));
448	strlcpy(dev->device_make_and_model, device_make_and_model,
449	sizeof(dev->device_make_and_model));
450	strlcpy(dev->device_info, device_info, sizeof(dev->device_info));
451	strlcpy(dev->device_uri, device_uri, sizeof(dev->device_uri));
452	strlcpy(dev->device_id, device_id, sizeof(dev->device_id));
453
454	/*
455	* Add the device to the array and return...
456	*/
457
458	cupsArrayAdd(devs, dev);
459
460	return (dev);
461	}
462
463
464	/*
465	* 'compare_devs()' - Compare device names for sorting.
466	*/
467
468	static int /* O - Result of comparison */
469	compare_devs(dev_info_t d0, / I - First device */
470	dev_info_t d1) / I - Second device */
471	{
472	int diff; /* Difference between strings */
473
474
475	/*
476	* Sort devices by device-info, device-class, and device-uri...
477	*/
478
479	if ((diff = cupsdCompareNames(d0->device_info, d1->device_info)) != 0)
480	return (diff);
481	else if ((diff = strcasecmp(d0->device_class, d1->device_class)) != 0)
482	return (diff);
483	else
484	return (strcasecmp(d0->device_uri, d1->device_uri));
485	}
486
487
488	/*
489	* 'sigalrm_handler()' - Handle alarm signals for backends that get hung
490	* trying to list the available devices...
491	*/
492
493	static void
494	sigalrm_handler(int sig) /* I - Signal number */
495	{
496	(void)sig; /* remove compiler warnings... */
497
498	alarm_tripped = 1;
499	}
500
501
502	/*
b423cd4c	503	* End of "$Id: cups-deviced.c 5194 2006-02-27 20:57:07Z mike $".
ef416fc2	504	*/