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

/*
 * "$Id: cups-deviced.c 6649 2007-07-11 21:46:42Z mike $"
 *
 *   Device scanning mini-daemon for the Common UNIX Printing System (CUPS).
 *
 *   Copyright 2007 by Apple Inc.
 *   Copyright 1997-2006 by Easy Software Products.
 *
 *   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"
 *   which should have been included with this file.  If this file is
 *   file is missing or damaged, see the license at "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 6649 2007-07-11 21:46:42Z mike $".
 */
Commit	Line	Data
ef416fc2	1	/*
bc44d920	2	* "$Id: cups-deviced.c 6649 2007-07-11 21:46:42Z mike $"
ef416fc2	3	*
	4	* Device scanning mini-daemon for the Common UNIX Printing System (CUPS).
	5	*
bc44d920	6	* Copyright 2007 by Apple Inc.
bd7854cb	7	* Copyright 1997-2006 by Easy Software Products.
ef416fc2	8	*
ef416fc2	9	* These coded instructions, statements, and computer programs are the
bc44d920	10	* property of Apple Inc. and are protected by Federal copyright
	11	* law. Distribution and use rights are outlined in the file "LICENSE.txt"
	12	* which should have been included with this file. If this file is
	13	* file is missing or damaged, see the license at "http://www.cups.org/".
ef416fc2	14	*
	15	* Contents:
	16	*
	17	* main() - Scan for devices and return an IPP response.
	18	* add_dev() - Add a new device to the list.
	19	* compare_devs() - Compare device names for sorting.
	20	* sigalrm_handler() - Handle alarm signals for backends that get hung
	21	*/
	22
	23	/*
	24	* Include necessary headers...
	25	*/
	26
	27	#include "util.h"
	28	#include <cups/array.h>
	29	#include <cups/dir.h>
	30
b423cd4c	31	#ifdef __hpux
	32	# define seteuid(uid) setresuid(-1, (uid), -1)
	33	#endif /* __hpux */
	34
ef416fc2	35
	36	/*
	37	* Device information structure...
	38	*/
	39
	40	typedef struct
	41	{
	42	char device_class[128], /* Device class */
	43	device_make_and_model[128], /* Make and model, if known */
	44	device_info[128], /* Device info/description */
	45	device_uri[1024], /* Device URI */
	46	device_id[1024]; /* 1284 Device ID */
	47	} dev_info_t;
	48
	49
	50	/*
	51	* Local globals...
	52	*/
	53
	54	static int alarm_tripped; /* Non-zero if alarm was tripped */
	55	static cups_array_t devs; / Device info */
e00b005a	56	static int normal_user; /* Normal user ID */
ef416fc2	57
	58
	59	/*
	60	* Local functions...
	61	*/
	62
	63	static dev_info_t add_dev(const char device_class,
	64	const char *device_make_and_model,
	65	const char *device_info,
	66	const char *device_uri,
	67	const char *device_id);
	68	static int compare_devs(dev_info_t p0, dev_info_t p1);
	69	static void sigalrm_handler(int sig);
	70
	71
	72	/*
	73	* 'main()' - Scan for devices and return an IPP response.
	74	*
	75	* Usage:
	76	*
	77	* cups-deviced request_id limit options
	78	*/
	79
	80	int /* O - Exit code */
	81	main(int argc, /* I - Number of command-line args */
	82	char argv[]) / I - Command-line arguments */
	83	{
	84	const char server_bin; / CUPS_SERVERBIN environment variable */
	85	char backends[1024]; /* Location of backends */
e00b005a	86	int request_id; /* Request ID */
ef416fc2	87	int count; /* Number of devices from backend */
	88	int compat; /* Compatibility device? */
	89	FILE fp; / Pipe to device backend */
	90	cups_dir_t dir; / Directory pointer */
	91	cups_dentry_t dent; / Directory entry */
	92	char filename[1024], /* Name of backend */
	93	line[2048], /* Line from backend */
	94	dclass[64], /* Device class */
	95	uri[1024], /* Device URI */
	96	info[128], /* Device info */
	97	make_model[256], /* Make and model */
	98	device_id[1024]; /* 1284 device ID */
	99	int num_options; /* Number of options */
	100	cups_option_t options; / Options */
	101	const char requested; / requested-attributes option */
	102	int send_class, /* Send device-class attribute? */
	103	send_info, /* Send device-info attribute? */
	104	send_make_and_model, /* Send device-make-and-model attribute? */
	105	send_uri, /* Send device-uri attribute? */
	106	send_id; /* Send device-id attribute? */
	107	dev_info_t dev; / Current device */
	108	#if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
	109	struct sigaction action; /* Actions for POSIX signals */
	110	#endif /* HAVE_SIGACTION && !HAVE_SIGSET */
	111
	112
e00b005a	113	setbuf(stderr, NULL);
e00b005a	114
ef416fc2	115	/*
	116	* Check the command-line...
	117	*/
	118
e00b005a	119	if (argc > 1)
	120	request_id = atoi(argv[1]);
	121	else
	122	request_id = 1;
	123
	124	if (argc != 5)
	125	{
	126	fputs("Usage: cups-deviced request-id limit user-id options\n", stderr);
	127
e00b005a	128	return (1);
	129	}
	130
	131	if (request_id < 1)
ef416fc2	132	{
e00b005a	133	fprintf(stderr, "cups-deviced: Bad request ID %d!\n", request_id);
e00b005a	134
ef416fc2	135	return (1);
	136	}
	137
e00b005a	138	normal_user = atoi(argv[3]);
	139	if (normal_user <= 0)
	140	{
	141	fprintf(stderr, "cups-deviced: Bad user %d!\n", normal_user);
	142
e00b005a	143	return (1);
	144	}
	145
	146	num_options = cupsParseOptions(argv[4], 0, &options);
ef416fc2	147	requested = cupsGetOption("requested-attributes", num_options, options);
	148
	149	if (!requested \|\| strstr(requested, "all"))
	150	{
	151	send_class = 1;
	152	send_info = 1;
	153	send_make_and_model = 1;
	154	send_uri = 1;
	155	send_id = 1;
	156	}
	157	else
	158	{
	159	send_class = strstr(requested, "device-class") != NULL;
	160	send_info = strstr(requested, "device-info") != NULL;
	161	send_make_and_model = strstr(requested, "device-make-and-model") != NULL;
	162	send_uri = strstr(requested, "device-uri") != NULL;
	163	send_id = strstr(requested, "device-id") != NULL;
	164	}
	165
	166	/*
	167	* Try opening the backend directory...
	168	*/
	169
	170	if ((server_bin = getenv("CUPS_SERVERBIN")) == NULL)
	171	server_bin = CUPS_SERVERBIN;
	172
	173	snprintf(backends, sizeof(backends), "%s/backend", server_bin);
	174
	175	if ((dir = cupsDirOpen(backends)) == NULL)
	176	{
e00b005a	177	fprintf(stderr, "ERROR: [cups-deviced] Unable to open backend directory "
	178	"\"%s\": %s", backends, strerror(errno));
	179
ef416fc2	180	return (1);
	181	}
	182
	183	/*
	184	* Setup the devices array...
	185	*/
	186
	187	devs = cupsArrayNew((cups_array_func_t)compare_devs, NULL);
	188
	189	/*
	190	* Loop through all of the device backends...
	191	*/
	192
	193	while ((dent = cupsDirRead(dir)) != NULL)
	194	{
e00b005a	195	/*
	196	* Skip entries that are not executable files...
	197	*/
	198
	199	if (!S_ISREG(dent->fileinfo.st_mode) \|\|
	200	(dent->fileinfo.st_mode & (S_IRUSR \| S_IXUSR)) != (S_IRUSR \| S_IXUSR))
	201	continue;
	202
	203	/*
	204	* Change effective users depending on the backend permissions...
	205	*/
	206
	207	if (!getuid())
	208	{
	209	/*
	210	* Backends without permissions for normal users run as root,
	211	* all others run as the unprivileged user...
	212	*/
	213
	214	if (!(dent->fileinfo.st_mode & (S_IRWXG \| S_IRWXO)))
	215	seteuid(0);
	216	else
	217	seteuid(normal_user);
	218	}
	219
ef416fc2	220	/*
	221	* Run the backend with no arguments and collect the output...
	222	*/
	223
	224	snprintf(filename, sizeof(filename), "%s/%s", backends, dent->filename);
	225	if ((fp = popen(filename, "r")) != NULL)
	226	{
	227	/*
	228	* Set an alarm for the first read from the backend; this avoids
	229	* problems when a backend is hung getting device information.
	230	*/
	231
	232	#ifdef HAVE_SIGSET /* Use System V signals over POSIX to avoid bugs */
	233	sigset(SIGALRM, sigalrm_handler);
	234	#elif defined(HAVE_SIGACTION)
	235	memset(&action, 0, sizeof(action));
	236
	237	sigemptyset(&action.sa_mask);
	238	sigaddset(&action.sa_mask, SIGALRM);
	239	action.sa_handler = sigalrm_handler;
	240	sigaction(SIGALRM, &action, NULL);
	241	#else
	242	signal(SIGALRM, sigalrm_handler);
	243	#endif /* HAVE_SIGSET */
	244
	245	alarm_tripped = 0;
	246	count = 0;
	247	compat = !strcmp(dent->filename, "smb");
	248
	249	alarm(30);
	250
	251	while (fgets(line, sizeof(line), fp) != NULL)
	252	{
	253	/*
	254	* Reset the alarm clock...
	255	*/
	256
	257	alarm(30);
	258
	259	/*
	260	* Each line is of the form:
	261	*
	262	* class URI "make model" "name" ["1284 device ID"]
	263	*/
	264
	265	device_id[0] = '\0';
	266
	267	if (!strncasecmp(line, "Usage", 5))
	268	compat = 1;
	269	else if (sscanf(line,
480ef0fe	270	"%63s%1023s%[ \t]\"%255[^\"]\"%[ \t]\"%127[^\"]\""
ef416fc2	271	"%*[ \t]\"%1023[^\"]",
	272	dclass, uri, make_model, info, device_id) < 4)
	273	{
	274	/*
	275	* Bad format; strip trailing newline and write an error message.
	276	*/
	277
	278	if (line[strlen(line) - 1] == '\n')
	279	line[strlen(line) - 1] = '\0';
	280
	281	fprintf(stderr, "ERROR: [cups-deviced] Bad line from \"%s\": %s\n",
	282	dent->filename, line);
	283	compat = 1;
	284	break;
	285	}
	286	else
	287	{
	288	/*
	289	* Add the device to the array of available devices...
	290	*/
	291
	292	dev = add_dev(dclass, make_model, info, uri, device_id);
	293	if (!dev)
	294	{
	295	cupsDirClose(dir);
	296	return (1);
	297	}
	298
e00b005a	299	fprintf(stderr, "DEBUG: [cups-deviced] Added device \"%s\"...\n",
e00b005a	300	uri);
ef416fc2	301	count ++;
	302	}
	303	}
	304
	305	/*
	306	* Turn the alarm clock off and close the pipe to the command...
	307	*/
	308
	309	alarm(0);
	310
	311	if (alarm_tripped)
e00b005a	312	fprintf(stderr, "WARNING: [cups-deviced] Backend \"%s\" did not "
e00b005a	313	"respond within 30 seconds!\n", dent->filename);
ef416fc2	314
	315	pclose(fp);
	316
	317	/*
	318	* Hack for backends that don't support the CUPS 1.1 calling convention:
	319	* add a network device with the method == backend name.
	320	*/
	321
	322	if (count == 0 && compat)
	323	{
	324	snprintf(line, sizeof(line), "Unknown Network Device (%s)",
	325	dent->filename);
	326
	327	dev = add_dev("network", line, "Unknown", dent->filename, "");
	328	if (!dev)
	329	{
	330	cupsDirClose(dir);
	331	return (1);
	332	}
	333
e00b005a	334	fprintf(stderr, "DEBUG: [cups-deviced] Compatibility device "
e00b005a	335	"\"%s\"...\n", dent->filename);
ef416fc2	336	}
	337	}
	338	else
e00b005a	339	fprintf(stderr, "WARNING: [cups-deviced] Unable to execute \"%s\" "
e00b005a	340	"backend: %s\n", dent->filename, strerror(errno));
ef416fc2	341	}
	342
	343	cupsDirClose(dir);
	344
e00b005a	345	/*
	346	* Switch back to root as needed...
	347	*/
	348
	349	if (!getuid() && geteuid())
	350	seteuid(0);
	351
ef416fc2	352	/*
	353	* Output the list of devices...
	354	*/
	355
	356	puts("Content-Type: application/ipp\n");
	357
e00b005a	358	cupsdSendIPPHeader(IPP_OK, request_id);
ef416fc2	359	cupsdSendIPPGroup(IPP_TAG_OPERATION);
	360	cupsdSendIPPString(IPP_TAG_CHARSET, "attributes-charset", "utf-8");
	361	cupsdSendIPPString(IPP_TAG_LANGUAGE, "attributes-natural-language", "en-US");
	362
	363	if ((count = atoi(argv[2])) <= 0)
	364	count = cupsArrayCount(devs);
	365
	366	if (count > cupsArrayCount(devs))
	367	count = cupsArrayCount(devs);
	368
	369	for (dev = (dev_info_t *)cupsArrayFirst(devs);
	370	count > 0;
	371	count --, dev = (dev_info_t *)cupsArrayNext(devs))
	372	{
	373	/*
	374	* Add strings to attributes...
	375	*/
	376
	377	cupsdSendIPPGroup(IPP_TAG_PRINTER);
	378	if (send_class)
	379	cupsdSendIPPString(IPP_TAG_KEYWORD, "device-class", dev->device_class);
	380	if (send_info)
	381	cupsdSendIPPString(IPP_TAG_TEXT, "device-info", dev->device_info);
	382	if (send_make_and_model)
	383	cupsdSendIPPString(IPP_TAG_TEXT, "device-make-and-model",
	384	dev->device_make_and_model);
	385	if (send_uri)
	386	cupsdSendIPPString(IPP_TAG_URI, "device-uri", dev->device_uri);
	387	if (send_id)
	388	cupsdSendIPPString(IPP_TAG_TEXT, "device-id", dev->device_id);
	389	}
	390
	391	cupsdSendIPPTrailer();
	392
	393	/*
	394	* Free the devices array and return...
	395	*/
	396
	397	for (dev = (dev_info_t *)cupsArrayFirst(devs);
	398	dev;
	399	dev = (dev_info_t *)cupsArrayNext(devs))
	400	free(dev);
	401
	402	cupsArrayDelete(devs);
	403
	404	return (0);
	405	}
	406
	407
	408	/*
	409	* 'add_dev()' - Add a new device to the list.
	410	*/
	411
	412	static dev_info_t * /* O - New device or NULL on error */
	413	add_dev(
	414	const char device_class, / I - Device class */
	415	const char device_make_and_model, / I - Device make and model */
	416	const char device_info, / I - Device information */
	417	const char device_uri, / I - Device URI */
	418	const char device_id) / I - 1284 device ID */
	419	{
	420	dev_info_t dev; / New device */
	421
	422
423	/*
424	* Allocate memory for the device record...
425	*/
426
427	if ((dev = calloc(1, sizeof(dev_info_t))) == NULL)
428	{
429	fputs("ERROR: [cups-deviced] Ran out of memory allocating a device!\n",
430	stderr);
431	return (NULL);
432	}
433
434	/*
435	* Copy the strings over...
436	*/
437
438	strlcpy(dev->device_class, device_class, sizeof(dev->device_class));
439	strlcpy(dev->device_make_and_model, device_make_and_model,
440	sizeof(dev->device_make_and_model));
441	strlcpy(dev->device_info, device_info, sizeof(dev->device_info));
442	strlcpy(dev->device_uri, device_uri, sizeof(dev->device_uri));
443	strlcpy(dev->device_id, device_id, sizeof(dev->device_id));
444
445	/*
446	* Add the device to the array and return...
447	*/
448
449	cupsArrayAdd(devs, dev);
450
451	return (dev);
452	}
453
454
455	/*
456	* 'compare_devs()' - Compare device names for sorting.
457	*/
458
459	static int /* O - Result of comparison */
460	compare_devs(dev_info_t d0, / I - First device */
461	dev_info_t d1) / I - Second device */
462	{
463	int diff; /* Difference between strings */
464
465
466	/*
467	* Sort devices by device-info, device-class, and device-uri...
468	*/
469
470	if ((diff = cupsdCompareNames(d0->device_info, d1->device_info)) != 0)
471	return (diff);
472	else if ((diff = strcasecmp(d0->device_class, d1->device_class)) != 0)
473	return (diff);
474	else
475	return (strcasecmp(d0->device_uri, d1->device_uri));
476	}
477
478
479	/*
480	* 'sigalrm_handler()' - Handle alarm signals for backends that get hung
481	* trying to list the available devices...
482	*/
483
484	static void
485	sigalrm_handler(int sig) /* I - Signal number */
486	{
487	(void)sig; /* remove compiler warnings... */
488
489	alarm_tripped = 1;
490	}
491
492
493	/*
bc44d920	494	* End of "$Id: cups-deviced.c 6649 2007-07-11 21:46:42Z mike $".
ef416fc2	495	*/