Merge changes from CUPS 1.6svn-r10002

[thirdparty/cups.git] / backend / ipp.c

/*
 * "$Id: ipp.c 9759 2011-05-11 03:24:33Z mike $"
 *
 *   IPP backend for CUPS.
 *
 *   Copyright 2007-2011 by Apple Inc.
 *   Copyright 1997-2007 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.
 *
 * Contents:
 *
 *   main()                 - Send a file to the printer or server.
 *   cancel_job()           - Cancel a print job.
 *   check_printer_state()  - Check the printer state.
 *   compress_files()       - Compress print files.
 *   monitor_printer()      - Monitor the printer state.
 *   new_request()          - Create a new print creation or validation request.
 *   password_cb()          - Disable the password prompt for
 *                            cupsDoFileRequest().
 *   report_attr()          - Report an IPP attribute value.
 *   report_printer_state() - Report the printer state.
 *   run_as_user()          - Run the IPP backend as the printing user.
 *   timeout_cb()           - Handle HTTP timeouts.
 *   sigterm_handler()      - Handle 'terminate' signals that stop the backend.
 */

/*
 * Include necessary headers.
 */

#include "backend-private.h"
#include <cups/array-private.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#if defined(HAVE_GSSAPI) && defined(HAVE_XPC)
#  include <xpc/xpc.h>
#  define kPMPrintUIToolAgent   "com.apple.printuitool.agent"
#  define kPMStartJob           100
#  define kPMWaitForJob         101
extern void     xpc_connection_set_target_uid(xpc_connection_t connection,
                                              uid_t uid);
#endif /* HAVE_GSSAPI && HAVE_XPC */


/*
 * Types...
 */

typedef struct _cups_monitor_s          /**** Monitoring data ****/
{
  const char            *uri,           /* Printer URI */
                        *hostname,      /* Hostname */
                        *user,          /* Username */
                        *resource;      /* Resource path */
  int                   port,           /* Port number */
                        version,        /* IPP version */
                        job_id;         /* Job ID for submitted job */
  http_encryption_t     encryption;     /* Use encryption? */
  ipp_jstate_t          job_state;      /* Current job state */
  ipp_pstate_t          printer_state;  /* Current printer state */
} _cups_monitor_t;


/*
 * Globals...
 */

static const char       *auth_info_required;
                                        /* New auth-info-required value */
#if defined(HAVE_GSSAPI) && defined(HAVE_XPC)
static int              child_pid = 0;  /* Child process ID */
#endif /* HAVE_GSSAPI && HAVE_XPC */
static const char * const jattrs[] =    /* Job attributes we want */
{
  "job-impressions-completed",
  "job-media-sheets-completed",
  "job-state",
  "job-state-reasons"
};
static int              job_canceled = 0;
                                        /* Job cancelled? */
static char             *password = NULL;
                                        /* Password for device URI */
static int              password_tries = 0;
                                        /* Password tries */
static const char * const pattrs[] =    /* Printer attributes we want */
{
  "copies-supported",
  "cups-version",
  "document-format-supported",
  "marker-colors",
  "marker-high-levels",
  "marker-levels",
  "marker-low-levels",
  "marker-message",
  "marker-names",
  "marker-types",
  "media-col-supported",
  "multiple-document-handling-supported",
  "operations-supported",
  "printer-alert",
  "printer-alert-description",
  "printer-is-accepting-jobs",
  "printer-state",
  "printer-state-message",
  "printer-state-reasons"
};
static const char * const remote_job_states[] =
{                                       /* Remote job state keywords */
  "+cups-remote-pending",
  "+cups-remote-pending-held",
  "+cups-remote-processing",
  "+cups-remote-stopped",
  "+cups-remote-canceled",
  "+cups-remote-aborted",
  "+cups-remote-completed"
};
static _cups_mutex_t    report_mutex = _CUPS_MUTEX_INITIALIZER;
                                        /* Mutex to control access */
static int              num_attr_cache = 0;
                                        /* Number of cached attributes */
static cups_option_t    *attr_cache = NULL;
                                        /* Cached attributes */
static cups_array_t     *state_reasons; /* Array of printe-state-reasons keywords */
static char             tmpfilename[1024] = "";
                                        /* Temporary spool file name */


/*
 * Local functions...
 */

static void             cancel_job(http_t *http, const char *uri, int id,
                                   const char *resource, const char *user,
                                   int version);
static ipp_pstate_t     check_printer_state(http_t *http, const char *uri,
                                            const char *resource,
                                            const char *user, int version);
#ifdef HAVE_LIBZ
static void             compress_files(int num_files, char **files);
#endif /* HAVE_LIBZ */
static void             *monitor_printer(_cups_monitor_t *monitor);
static ipp_t            *new_request(ipp_op_t op, int version, const char *uri,
                                     const char *user, const char *title,
                                     int num_options, cups_option_t *options,
                                     const char *compression, int copies,
                                     const char *format, _ppd_cache_t *pc,
                                     ipp_attribute_t *media_col_sup,
                                     ipp_attribute_t *doc_handling_sup);
static const char       *password_cb(const char *);
static void             report_attr(ipp_attribute_t *attr);
static void             report_printer_state(ipp_t *ipp);
#if defined(HAVE_GSSAPI) && defined(HAVE_XPC)
static int              run_as_user(int argc, char *argv[], uid_t uid,
                                    const char *device_uri, int fd);
#endif /* HAVE_GSSAPI && HAVE_XPC */
static void             sigterm_handler(int sig);
static int              timeout_cb(http_t *http, void *user_data);
static void             update_reasons(ipp_attribute_t *attr, const char *s);


/*
 * 'main()' - Send a file to the printer or server.
 *
 * Usage:
 *
 *    printer-uri job-id user title copies options [file]
 */

int                                     /* O - Exit status */
main(int  argc,                         /* I - Number of command-line args */
     char *argv[])                      /* I - Command-line arguments */
{
  int           i;                      /* Looping var */
  int           send_options;           /* Send job options? */
  int           num_options;            /* Number of printer options */
  cups_option_t *options;               /* Printer options */
  const char    *device_uri;            /* Device URI */
  char          scheme[255],            /* Scheme in URI */
                hostname[1024],         /* Hostname */
                username[255],          /* Username info */
                resource[1024],         /* Resource info (printer name) */
                addrname[256],          /* Address name */
                *optptr,                /* Pointer to URI options */
                *name,                  /* Name of option */
                *value,                 /* Value of option */
                sep;                    /* Separator character */
  http_addrlist_t *addrlist;            /* Address of printer */
  int           snmp_fd,                /* SNMP socket */
                start_count,            /* Page count via SNMP at start */
                page_count,             /* Page count via SNMP */
                have_supplies;          /* Printer supports supply levels? */
  int           num_files;              /* Number of files to print */
  char          **files,                /* Files to print */
                *compatfile = NULL;     /* Compatibility filename */
  off_t         compatsize = 0;         /* Size of compatibility file */
  int           port;                   /* Port number (not used) */
  char          portname[255];          /* Port name */
  char          uri[HTTP_MAX_URI];      /* Updated URI without user/pass */
  http_status_t http_status;            /* Status of HTTP request */
  ipp_status_t  ipp_status;             /* Status of IPP request */
  http_t        *http;                  /* HTTP connection */
  ipp_t         *request,               /* IPP request */
                *response,              /* IPP response */
                *supported;             /* get-printer-attributes response */
  time_t        start_time;             /* Time of first connect */
  int           contimeout;             /* Connection timeout */
  int           delay,                  /* Delay for retries */
                prev_delay;             /* Previous delay */
  const char    *compression;           /* Compression mode */
  int           waitjob,                /* Wait for job complete? */
                waitprinter;            /* Wait for printer ready? */
  _cups_monitor_t monitor;              /* Monitoring data */
  ipp_attribute_t *job_id_attr;         /* job-id attribute */
  int           job_id;                 /* job-id value */
  ipp_attribute_t *job_sheets;          /* job-media-sheets-completed */
  ipp_attribute_t *job_state;           /* job-state */
  ipp_attribute_t *copies_sup;          /* copies-supported */
  ipp_attribute_t *cups_version;        /* cups-version */
  ipp_attribute_t *format_sup;          /* document-format-supported */
  ipp_attribute_t *media_col_sup;       /* media-col-supported */
  ipp_attribute_t *operations_sup;      /* operations-supported */
  ipp_attribute_t *doc_handling_sup;    /* multiple-document-handling-supported */
  ipp_attribute_t *printer_state;       /* printer-state attribute */
  ipp_attribute_t *printer_accepting;   /* printer-is-accepting-jobs */
  int           validate_job;           /* Does printer support Validate-Job? */
  int           copies,                 /* Number of copies for job */
                copies_remaining;       /* Number of copies remaining */
  const char    *content_type,          /* CONTENT_TYPE environment variable */
                *final_content_type,    /* FINAL_CONTENT_TYPE environment var */
                *document_format;       /* document-format value */
  int           fd;                     /* File descriptor */
  off_t         bytes = 0;              /* Bytes copied */
  char          buffer[16384];          /* Copy buffer */
#if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
  struct sigaction action;              /* Actions for POSIX signals */
#endif /* HAVE_SIGACTION && !HAVE_SIGSET */
  int           version;                /* IPP version */
  ppd_file_t    *ppd;                   /* PPD file */
  _ppd_cache_t  *pc;                    /* PPD cache and mapping data */
  fd_set        input;                  /* Input set for select() */


 /*
  * Make sure status messages are not buffered...
  */

  setbuf(stderr, NULL);

 /*
  * Ignore SIGPIPE and catch SIGTERM signals...
  */

#ifdef HAVE_SIGSET
  sigset(SIGPIPE, SIG_IGN);
  sigset(SIGTERM, sigterm_handler);
#elif defined(HAVE_SIGACTION)
  memset(&action, 0, sizeof(action));
  action.sa_handler = SIG_IGN;
  sigaction(SIGPIPE, &action, NULL);

  sigemptyset(&action.sa_mask);
  sigaddset(&action.sa_mask, SIGTERM);
  action.sa_handler = sigterm_handler;
  sigaction(SIGTERM, &action, NULL);
#else
  signal(SIGPIPE, SIG_IGN);
  signal(SIGTERM, sigterm_handler);
#endif /* HAVE_SIGSET */

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

  if (argc == 1)
  {
    char *s;

    if ((s = strrchr(argv[0], '/')) != NULL)
      s ++;
    else
      s = argv[0];

    printf("network %s \"Unknown\" \"%s (%s)\"\n",
           s, _cupsLangString(cupsLangDefault(),
                              _("Internet Printing Protocol")), s);
    return (CUPS_BACKEND_OK);
  }
  else if (argc < 6)
  {
    _cupsLangPrintf(stderr,
                    _("Usage: %s job-id user title copies options [file]"),
                    argv[0]);
    return (CUPS_BACKEND_STOP);
  }

 /*
  * Get the device URI...
  */

  while ((device_uri = cupsBackendDeviceURI(argv)) == NULL)
  {
    _cupsLangPrintFilter(stderr, "INFO", _("Unable to locate printer."));
    sleep(10);

    if (getenv("CLASS") != NULL)
      return (CUPS_BACKEND_FAILED);
  }

  if ((auth_info_required = getenv("AUTH_INFO_REQUIRED")) == NULL)
    auth_info_required = "none";

  state_reasons = _cupsArrayNewStrings(getenv("PRINTER_STATE_REASONS"));

#ifdef HAVE_GSSAPI
 /*
  * For Kerberos, become the printing user (if we can) to get the credentials
  * that way.
  */

  if (!getuid() && (value = getenv("AUTH_UID")) != NULL)
  {
    uid_t       uid = (uid_t)atoi(value);
                                        /* User ID */

#  ifdef HAVE_XPC
    if (uid > 0)
    {
      if (argc == 6)
        return (run_as_user(argc, argv, uid, device_uri, 0));
      else
      {
        int status = 0;                 /* Exit status */

        for (i = 6; i < argc && !status && !job_canceled; i ++)
        {
          if ((fd = open(argv[i], O_RDONLY)) >= 0)
          {
            status = run_as_user(argc, argv, uid, device_uri, fd);
            close(fd);
          }
          else
          {
            _cupsLangPrintError("ERROR", _("Unable to open print file"));
            status = CUPS_BACKEND_FAILED;
          }
        }

        return (status);
      }
    }

#  else /* No XPC, just try to run as the user ID */
    if (uid > 0)
      seteuid(uid);
#  endif /* HAVE_XPC */
  }
#endif /* HAVE_GSSAPI */

 /*
  * Get the (final) content type...
  */

  if ((content_type = getenv("CONTENT_TYPE")) == NULL)
    content_type = "application/octet-stream";

  if ((final_content_type = getenv("FINAL_CONTENT_TYPE")) == NULL)
  {
    final_content_type = content_type;

    if (!strncmp(final_content_type, "printer/", 8))
      final_content_type = "application/vnd.cups-raw";
  }

 /*
  * Extract the hostname and printer name from the URI...
  */

  httpSeparateURI(HTTP_URI_CODING_ALL, device_uri, scheme, sizeof(scheme),
                  username, sizeof(username), hostname, sizeof(hostname), &port,
                  resource, sizeof(resource));

  if (!port)
    port = IPP_PORT;                    /* Default to port 631 */

  if (!strcmp(scheme, "https"))
    cupsSetEncryption(HTTP_ENCRYPT_ALWAYS);
  else
    cupsSetEncryption(HTTP_ENCRYPT_IF_REQUESTED);

 /*
  * See if there are any options...
  */

  compression = NULL;
  version     = 20;
  waitjob     = 1;
  waitprinter = 1;
  contimeout  = 7 * 24 * 60 * 60;

  if ((optptr = strchr(resource, '?')) != NULL)
  {
   /*
    * Yup, terminate the device name string and move to the first
    * character of the optptr...
    */

    *optptr++ = '\0';

   /*
    * Then parse the optptr...
    */

    while (*optptr)
    {
     /*
      * Get the name...
      */

      name = optptr;

      while (*optptr && *optptr != '=' && *optptr != '+' && *optptr != '&')
        optptr ++;

      if ((sep = *optptr) != '\0')
        *optptr++ = '\0';

      if (sep == '=')
      {
       /*
        * Get the value...
        */

        value = optptr;

        while (*optptr && *optptr != '+' && *optptr != '&')
          optptr ++;

        if (*optptr)
          *optptr++ = '\0';
      }
      else
        value = (char *)"";

     /*
      * Process the option...
      */

      if (!_cups_strcasecmp(name, "waitjob"))
      {
       /*
        * Wait for job completion?
        */

        waitjob = !_cups_strcasecmp(value, "on") ||
                  !_cups_strcasecmp(value, "yes") ||
                  !_cups_strcasecmp(value, "true");
      }
      else if (!_cups_strcasecmp(name, "waitprinter"))
      {
       /*
        * Wait for printer idle?
        */

        waitprinter = !_cups_strcasecmp(value, "on") ||
                      !_cups_strcasecmp(value, "yes") ||
                      !_cups_strcasecmp(value, "true");
      }
      else if (!_cups_strcasecmp(name, "encryption"))
      {
       /*
        * Enable/disable encryption?
        */

        if (!_cups_strcasecmp(value, "always"))
          cupsSetEncryption(HTTP_ENCRYPT_ALWAYS);
        else if (!_cups_strcasecmp(value, "required"))
          cupsSetEncryption(HTTP_ENCRYPT_REQUIRED);
        else if (!_cups_strcasecmp(value, "never"))
          cupsSetEncryption(HTTP_ENCRYPT_NEVER);
        else if (!_cups_strcasecmp(value, "ifrequested"))
          cupsSetEncryption(HTTP_ENCRYPT_IF_REQUESTED);
        else
        {
          _cupsLangPrintFilter(stderr, "ERROR",
                               _("Unknown encryption option value: \"%s\"."),
                               value);
        }
      }
      else if (!_cups_strcasecmp(name, "version"))
      {
        if (!strcmp(value, "1.0"))
          version = 10;
        else if (!strcmp(value, "1.1"))
          version = 11;
        else if (!strcmp(value, "2.0"))
          version = 20;
        else if (!strcmp(value, "2.1"))
          version = 21;
        else if (!strcmp(value, "2.2"))
          version = 22;
        else
        {
          _cupsLangPrintFilter(stderr, "ERROR",
                               _("Unknown version option value: \"%s\"."),
                               value);
        }
      }
#ifdef HAVE_LIBZ
      else if (!_cups_strcasecmp(name, "compression"))
      {
        if (!_cups_strcasecmp(value, "true") || !_cups_strcasecmp(value, "yes") ||
            !_cups_strcasecmp(value, "on") || !_cups_strcasecmp(value, "gzip"))
          compression = "gzip";
      }
#endif /* HAVE_LIBZ */
      else if (!_cups_strcasecmp(name, "contimeout"))
      {
       /*
        * Set the connection timeout...
        */

        if (atoi(value) > 0)
          contimeout = atoi(value);
      }
      else
      {
       /*
        * Unknown option...
        */

        _cupsLangPrintFilter(stderr, "ERROR",
                             _("Unknown option \"%s\" with value \"%s\"."),
                             name, value);
      }
    }
  }

 /*
  * If we have 7 arguments, print the file named on the command-line.
  * Otherwise, copy stdin to a temporary file and print the temporary
  * file.
  */

  if (argc == 6)
  {
    num_files    = 0;
    files        = NULL;
    send_options = !_cups_strcasecmp(final_content_type, "application/pdf") ||
                   !_cups_strcasecmp(final_content_type, "application/vnd.cups-pdf") ||
                   !_cups_strncasecmp(final_content_type, "image/", 6);

    fputs("DEBUG: Sending stdin for job...\n", stderr);
  }
  else
  {
   /*
    * Point to the files on the command-line...
    */

    num_files    = argc - 6;
    files        = argv + 6;
    send_options = 1;

#ifdef HAVE_LIBZ
    if (compression)
      compress_files(num_files, files);
#endif /* HAVE_LIBZ */

    fprintf(stderr, "DEBUG: %d files to send in job...\n", num_files);
  }

 /*
  * Set the authentication info, if any...
  */

  cupsSetPasswordCB(password_cb);

  if (username[0])
  {
   /*
    * Use authenticaion information in the device URI...
    */

    if ((password = strchr(username, ':')) != NULL)
      *password++ = '\0';

    cupsSetUser(username);
  }
  else
  {
   /*
    * Try loading authentication information from the environment.
    */

    const char *ptr = getenv("AUTH_USERNAME");

    if (ptr)
      cupsSetUser(ptr);

    password = getenv("AUTH_PASSWORD");
  }

 /*
  * Try finding the remote server...
  */

  start_time = time(NULL);

  sprintf(portname, "%d", port);

  update_reasons(NULL, "+connecting-to-device");
  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)
    {
      update_reasons(NULL, "-connecting-to-device");
      return (CUPS_BACKEND_STOP);
    }
  }

  http = _httpCreate(hostname, port, addrlist, cupsEncryption(), AF_UNSPEC);
  httpSetTimeout(http, 30.0, timeout_cb, NULL);

 /*
  * See if the printer supports SNMP...
  */

  if ((snmp_fd = _cupsSNMPOpen(addrlist->addr.addr.sa_family)) >= 0)
  {
    have_supplies = !backendSNMPSupplies(snmp_fd, &(addrlist->addr),
                                         &start_count, NULL);
  }
  else
    have_supplies = start_count = 0;

 /*
  * Wait for data from the filter...
  */

  if (num_files == 0)
  {
    if (!backendWaitLoop(snmp_fd, &(addrlist->addr), 0, backendNetworkSideCB))
      return (CUPS_BACKEND_OK);
    else if ((bytes = read(0, buffer, sizeof(buffer))) <= 0)
      return (CUPS_BACKEND_OK);
  }

 /*
  * Try connecting to the remote server...
  */

  delay = _cupsNextDelay(0, &prev_delay);

  do
  {
    fprintf(stderr, "DEBUG: Connecting to %s:%d\n", hostname, port);
    _cupsLangPrintFilter(stderr, "INFO", _("Connecting to printer."));

    if (httpReconnect(http))
    {
      int error = errno;                /* Connection error */

      if (http->status == HTTP_PKI_ERROR)
        update_reasons(NULL, "+cups-certificate-error");

      if (job_canceled)
        break;

      if (getenv("CLASS") != NULL)
      {
       /*
        * If the CLASS environment variable is set, the job was submitted
        * to a class and not to a specific queue.  In this case, we want
        * to abort immediately so that the job can be requeued on the next
        * available printer in the class.
        */

        _cupsLangPrintFilter(stderr, "INFO",
                             _("Unable to contact printer, queuing on next "
                               "printer in class."));

       /*
        * Sleep 5 seconds to keep the job from requeuing too rapidly...
        */

        sleep(5);

        update_reasons(NULL, "-connecting-to-device");

        return (CUPS_BACKEND_FAILED);
      }

      fprintf(stderr, "DEBUG: Connection error: %s\n", strerror(errno));

      if (errno == ECONNREFUSED || errno == EHOSTDOWN ||
          errno == EHOSTUNREACH)
      {
        if (contimeout && (time(NULL) - start_time) > contimeout)
        {
          _cupsLangPrintFilter(stderr, "ERROR",
                               _("The printer is not responding."));
          update_reasons(NULL, "-connecting-to-device");
          return (CUPS_BACKEND_FAILED);
        }

        switch (error)
        {
          case EHOSTDOWN :
              _cupsLangPrintFilter(stderr, "WARNING",
                                   _("The printer may not exist or "
                                     "is unavailable at this time."));
              break;

          case EHOSTUNREACH :
              _cupsLangPrintFilter(stderr, "WARNING",
                                   _("The printer is unreachable at this "
                                     "time."));
              break;

          case ECONNREFUSED :
          default :
              _cupsLangPrintFilter(stderr, "WARNING",
                                   _("The printer is busy."));
              break;
        }

        sleep(delay);

        delay = _cupsNextDelay(delay, &prev_delay);
      }
      else
      {
        _cupsLangPrintFilter(stderr, "ERROR",
                             _("The printer is not responding."));
        sleep(30);
      }

      if (job_canceled)
        break;
    }
    else
      update_reasons(NULL, "-cups-certificate-error");
  }
  while (http->fd < 0);

  if (job_canceled || !http)
    return (CUPS_BACKEND_FAILED);

  update_reasons(NULL, "-connecting-to-device");
  _cupsLangPrintFilter(stderr, "INFO", _("Connected to printer."));

  fprintf(stderr, "DEBUG: Connected to %s:%d...\n",
          httpAddrString(http->hostaddr, addrname, sizeof(addrname)),
          _httpAddrPort(http->hostaddr));

 /*
  * Build a URI for the printer and fill the standard IPP attributes for
  * an IPP_PRINT_FILE request.  We can't use the URI in argv[0] because it
  * might contain username:password information...
  */

  httpAssembleURI(HTTP_URI_CODING_ALL, uri, sizeof(uri), scheme, NULL, hostname,
                  port, resource);

 /*
  * First validate the destination and see if the device supports multiple
  * copies...
  */

  copies_sup       = NULL;
  cups_version     = NULL;
  format_sup       = NULL;
  media_col_sup    = NULL;
  supported        = NULL;
  operations_sup   = NULL;
  doc_handling_sup = NULL;
  validate_job     = 0;

  do
  {
   /*
    * Check for side-channel requests...
    */

    backendCheckSideChannel(snmp_fd, http->hostaddr);

   /*
    * Build the IPP request...
    */

    request = ippNewRequest(IPP_GET_PRINTER_ATTRIBUTES);
    request->request.op.version[0] = version / 10;
    request->request.op.version[1] = version % 10;

    ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_URI, "printer-uri",
                 NULL, uri);

    ippAddStrings(request, IPP_TAG_OPERATION, IPP_TAG_KEYWORD,
                  "requested-attributes", sizeof(pattrs) / sizeof(pattrs[0]),
                  NULL, pattrs);

   /*
    * Do the request...
    */

    fputs("DEBUG: Getting supported attributes...\n", stderr);

    if (http->version < HTTP_1_1)
    {
      fprintf(stderr, "DEBUG: Printer responded with HTTP version %d.%d.\n",
              http->version / 100, http->version % 100);
      update_reasons(NULL, "+cups-ipp-conformance-failure-report,"
                           "cups-ipp-wrong-http-version");
    }

    supported  = cupsDoRequest(http, request, resource);
    ipp_status = cupsLastError();

    fprintf(stderr, "DEBUG: Get-Printer-Attributes: %s (%s)\n",
            ippErrorString(ipp_status), cupsLastErrorString());

    if (ipp_status > IPP_OK_CONFLICT)
    {
      fprintf(stderr, "DEBUG: Get-Printer-Attributes returned %s.\n",
              ippErrorString(ipp_status));

      if (ipp_status == IPP_PRINTER_BUSY ||
          ipp_status == IPP_SERVICE_UNAVAILABLE)
      {
        if (contimeout && (time(NULL) - start_time) > contimeout)
        {
          _cupsLangPrintFilter(stderr, "ERROR",
                               _("The printer is not responding."));
          return (CUPS_BACKEND_FAILED);
        }

        _cupsLangPrintFilter(stderr, "INFO", _("The printer is busy."));

        report_printer_state(supported);

        sleep(delay);

        delay = _cupsNextDelay(delay, &prev_delay);
      }
      else if ((ipp_status == IPP_BAD_REQUEST ||
                ipp_status == IPP_VERSION_NOT_SUPPORTED) && version > 10)
      {
       /*
        * Switch to IPP/1.1 or IPP/1.0...
        */

        if (version >= 20)
        {
          _cupsLangPrintFilter(stderr, "INFO",
                               _("Printer does not support IPP/%d.%d, trying "
                                 "IPP/%s."), version / 10, version % 10, "1.1");
          version = 11;
        }
        else
        {
          _cupsLangPrintFilter(stderr, "INFO",
                               _("Printer does not support IPP/%d.%d, trying "
                                 "IPP/%s."), version / 10, version % 10, "1.0");
          version = 10;
        }

        httpReconnect(http);
      }
      else if (ipp_status == IPP_NOT_FOUND)
      {
        _cupsLangPrintFilter(stderr, "ERROR",
                             _("The printer URI is incorrect or no longer "
                               "exists."));

        ippDelete(supported);

        return (CUPS_BACKEND_STOP);
      }
      else if (ipp_status == IPP_NOT_AUTHORIZED || ipp_status == IPP_FORBIDDEN)
      {
        if (!strncmp(httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE),
                     "Negotiate", 9))
          auth_info_required = "negotiate";

        fprintf(stderr, "ATTR: auth-info-required=%s\n", auth_info_required);
        return (CUPS_BACKEND_AUTH_REQUIRED);
      }
      else
      {
        _cupsLangPrintFilter(stderr, "ERROR",
                             _("Unable to get printer status."));
        sleep(10);
      }

      ippDelete(supported);
      supported = NULL;
      continue;
    }

    if (!getenv("CLASS"))
    {
     /*
      * Check printer-is-accepting-jobs = false and printer-state-reasons for the
      * "spool-area-full" keyword...
      */

      int busy = 0;

      if ((printer_accepting = ippFindAttribute(supported,
                                                "printer-is-accepting-jobs",
                                                IPP_TAG_BOOLEAN)) != NULL &&
          !printer_accepting->values[0].boolean)
        busy = 1;
      else if (!printer_accepting)
        update_reasons(NULL, "+cups-ipp-conformance-failure-report,"
                             "cups-ipp-missing-printer-is-accepting-jobs");

      if ((printer_state = ippFindAttribute(supported,
                                            "printer-state-reasons",
                                            IPP_TAG_KEYWORD)) != NULL && !busy)
      {
        for (i = 0; i < printer_state->num_values; i ++)
          if (!strcmp(printer_state->values[0].string.text,
                      "spool-area-full") ||
              !strncmp(printer_state->values[0].string.text, "spool-area-full-",
                       16))
          {
            busy = 1;
            break;
          }
      }
      else
        update_reasons(NULL, "+cups-ipp-conformance-failure-report,"
                             "cups-ipp-missing-printer-state-reasons");

      if (busy)
      {
        _cupsLangPrintFilter(stderr, "INFO", _("The printer is busy."));

        report_printer_state(supported);

        sleep(delay);

        delay = _cupsNextDelay(delay, &prev_delay);

        ippDelete(supported);
        supported = NULL;
        continue;
      }
    }

   /*
    * Check for supported attributes...
    */

    if ((copies_sup = ippFindAttribute(supported, "copies-supported",
                                       IPP_TAG_RANGE)) != NULL)
    {
     /*
      * Has the "copies-supported" attribute - does it have an upper
      * bound > 1?
      */

      fprintf(stderr, "DEBUG: copies-supported=%d-%d\n",
              copies_sup->values[0].range.lower,
              copies_sup->values[0].range.upper);

      if (copies_sup->values[0].range.upper <= 1)
        copies_sup = NULL; /* No */
    }

    cups_version = ippFindAttribute(supported, "cups-version", IPP_TAG_TEXT);

    if ((format_sup = ippFindAttribute(supported, "document-format-supported",
                                       IPP_TAG_MIMETYPE)) != NULL)
    {
      fprintf(stderr, "DEBUG: document-format-supported (%d values)\n",
              format_sup->num_values);
      for (i = 0; i < format_sup->num_values; i ++)
        fprintf(stderr, "DEBUG: [%d] = \"%s\"\n", i,
                format_sup->values[i].string.text);
    }

    if ((media_col_sup = ippFindAttribute(supported, "media-col-supported",
                                          IPP_TAG_KEYWORD)) != NULL)
    {
      fprintf(stderr, "DEBUG: media-col-supported (%d values)\n",
              media_col_sup->num_values);
      for (i = 0; i < media_col_sup->num_values; i ++)
        fprintf(stderr, "DEBUG: [%d] = \"%s\"\n", i,
                media_col_sup->values[i].string.text);
    }

    if ((operations_sup = ippFindAttribute(supported, "operations-supported",
                                           IPP_TAG_ENUM)) != NULL)
    {
      for (i = 0; i < operations_sup->num_values; i ++)
        if (operations_sup->values[i].integer == IPP_PRINT_JOB)
          break;

      if (i >= operations_sup->num_values)
        update_reasons(NULL, "+cups-ipp-conformance-failure-report,"
                             "cups-ipp-missing-print-job");

      for (i = 0; i < operations_sup->num_values; i ++)
        if (operations_sup->values[i].integer == IPP_CANCEL_JOB)
          break;

      if (i >= operations_sup->num_values)
        update_reasons(NULL, "+cups-ipp-conformance-failure-report,"
                             "cups-ipp-missing-cancel-job");

      for (i = 0; i < operations_sup->num_values; i ++)
        if (operations_sup->values[i].integer == IPP_GET_JOB_ATTRIBUTES)
          break;

      if (i >= operations_sup->num_values)
        update_reasons(NULL, "+cups-ipp-conformance-failure-report,"
                             "cups-ipp-missing-get-job-attributes");

      for (i = 0; i < operations_sup->num_values; i ++)
        if (operations_sup->values[i].integer == IPP_GET_PRINTER_ATTRIBUTES)
          break;

      if (i >= operations_sup->num_values)
        update_reasons(NULL, "+cups-ipp-conformance-failure-report,"
                             "cups-ipp-missing-get-printer-attributes");

      for (i = 0; i < operations_sup->num_values; i ++)
        if (operations_sup->values[i].integer == IPP_VALIDATE_JOB)
        {
          validate_job = 1;
          break;
        }

      if (!validate_job)
        update_reasons(NULL, "+cups-ipp-conformance-failure-report,"
                             "cups-ipp-missing-validate-job");
    }
    else
      update_reasons(NULL, "+cups-ipp-conformance-failure-report,"
                           "cups-ipp-missing-operations-supported");

    doc_handling_sup = ippFindAttribute(supported,
                                        "multiple-document-handling-supported",
                                        IPP_TAG_KEYWORD);

    report_printer_state(supported);
  }
  while (ipp_status > IPP_OK_CONFLICT);

 /*
  * See if the printer is accepting jobs and is not stopped; if either
  * condition is true and we are printing to a class, requeue the job...
  */

  if (getenv("CLASS") != NULL)
  {
    printer_state     = ippFindAttribute(supported, "printer-state",
                                         IPP_TAG_ENUM);
    printer_accepting = ippFindAttribute(supported, "printer-is-accepting-jobs",
                                         IPP_TAG_BOOLEAN);

    if (printer_state == NULL ||
        (printer_state->values[0].integer > IPP_PRINTER_PROCESSING &&
         waitprinter) ||
        printer_accepting == NULL ||
        !printer_accepting->values[0].boolean)
    {
     /*
      * If the CLASS environment variable is set, the job was submitted
      * to a class and not to a specific queue.  In this case, we want
      * to abort immediately so that the job can be requeued on the next
      * available printer in the class.
      */

      _cupsLangPrintFilter(stderr, "INFO",
                           _("Unable to contact printer, queuing on next "
                             "printer in class."));

      ippDelete(supported);
      httpClose(http);

     /*
      * Sleep 5 seconds to keep the job from requeuing too rapidly...
      */

      sleep(5);

      return (CUPS_BACKEND_FAILED);
    }
  }

 /*
  * See if the printer supports multiple copies...
  */

  copies = atoi(argv[4]);

  if (copies_sup || argc < 7)
  {
    copies_remaining = 1;

    if (argc < 7 && !send_options)
      copies = 1;
  }
  else
    copies_remaining = copies;

 /*
  * Prepare remaining printing options...
  */

  options = NULL;
  pc      = NULL;

  if (send_options)
  {
    num_options = cupsParseOptions(argv[5], 0, &options);

    if (!cups_version && media_col_sup)
    {
     /*
      * Load the PPD file and generate PWG attribute mapping information...
      */

      ppd = ppdOpenFile(getenv("PPD"));
      pc  = _ppdCacheCreateWithPPD(ppd);

      ppdClose(ppd);
    }
  }
  else
    num_options = 0;

  document_format = NULL;

  if (format_sup != NULL)
  {
    for (i = 0; i < format_sup->num_values; i ++)
      if (!_cups_strcasecmp(final_content_type, format_sup->values[i].string.text))
      {
        document_format = final_content_type;
        break;
      }

    if (!document_format)
    {
      for (i = 0; i < format_sup->num_values; i ++)
        if (!_cups_strcasecmp("application/octet-stream",
                        format_sup->values[i].string.text))
        {
          document_format = "application/octet-stream";
          break;
        }
    }
  }

 /*
  * If the printer does not support HTTP/1.1 (which IPP requires), copy stdin
  * to a temporary file so that we can do a HTTP/1.0 submission...
  *
  * (I hate compatibility hacks!)
  */

  if (http->version < HTTP_1_1 && num_files == 0)
  {
    if ((fd = cupsTempFd(tmpfilename, sizeof(tmpfilename))) < 0)
    {
      perror("DEBUG: Unable to create temporary file");
      return (CUPS_BACKEND_FAILED);
    }

    _cupsLangPrintFilter(stderr, "INFO", _("Copying print data."));

    compatsize = backendRunLoop(-1, fd, snmp_fd, &(addrlist->addr), 0, 0,
                                backendNetworkSideCB);

    close(fd);

    compatfile = tmpfilename;
    files      = &compatfile;
    num_files  = 1;
  }
  else if (http->version < HTTP_1_1 && num_files == 1)
  {
    struct stat fileinfo;               /* File information */

    if (!stat(files[0], &fileinfo))
      compatsize = fileinfo.st_size;
  }

 /*
  * Start monitoring the printer in the background...
  */

  monitor.uri           = uri;
  monitor.hostname      = hostname;
  monitor.user          = argv[2];
  monitor.resource      = resource;
  monitor.port          = port;
  monitor.version       = version;
  monitor.job_id        = 0;
  monitor.encryption    = cupsEncryption();
  monitor.job_state     = IPP_JOB_PENDING;
  monitor.printer_state = IPP_PRINTER_IDLE;

  _cupsThreadCreate((_cups_thread_func_t)monitor_printer, &monitor);

 /*
  * Validate access to the printer...
  */

  while (!job_canceled && validate_job)
  {
    request = new_request(IPP_VALIDATE_JOB, version, uri, argv[2], argv[3],
                          num_options, options, compression,
                          copies_sup ? copies : 1, document_format, pc,
                          media_col_sup, doc_handling_sup);

    ippDelete(cupsDoRequest(http, request, resource));

    ipp_status = cupsLastError();

    fprintf(stderr, "DEBUG: Validate-Job: %s (%s)\n",
            ippErrorString(ipp_status), cupsLastErrorString());

    if (job_canceled)
      break;

    if (ipp_status == IPP_SERVICE_UNAVAILABLE || ipp_status == IPP_PRINTER_BUSY)
    {
      _cupsLangPrintFilter(stderr, "INFO", _("The printer is busy."));
      sleep(10);
    }
    else if (ipp_status == IPP_NOT_AUTHORIZED || ipp_status == IPP_FORBIDDEN ||
             ipp_status == IPP_AUTHENTICATION_CANCELED)
    {
     /*
      * Update auth-info-required as needed...
      */

      fprintf(stderr, "DEBUG: WWW-Authenticate=\"%s\"\n",
              httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE));

     /*
      * Normal authentication goes through the password callback, which sets
      * auth_info_required to "username,password".  Kerberos goes directly
      * through GSSAPI, so look for Negotiate in the WWW-Authenticate header
      * here and set auth_info_required as needed...
      */

      if (!strncmp(httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE),
                   "Negotiate", 9))
        auth_info_required = "negotiate";

      goto cleanup;
    }
    else if (ipp_status == IPP_OPERATION_NOT_SUPPORTED)
    {
     /*
      * This is all too common...
      */

      update_reasons(NULL, "+cups-ipp-conformance-failure-report,"
                           "cups-ipp-missing-validate-job");
      break;
    }
    else if (ipp_status < IPP_REDIRECTION_OTHER_SITE)
      break;
  }

 /*
  * Then issue the print-job request...
  */

  job_id = 0;

  while (!job_canceled && copies_remaining > 0)
  {
   /*
    * Check for side-channel requests...
    */

    backendCheckSideChannel(snmp_fd, http->hostaddr);

   /*
    * Build the IPP job creation request...
    */

    if (job_canceled)
      break;

    request = new_request(num_files > 1 ? IPP_CREATE_JOB : IPP_PRINT_JOB,
                          version, uri, argv[2], argv[3], num_options, options,
                          compression, copies_sup ? copies : 1, document_format,
                          pc, media_col_sup, doc_handling_sup);

   /*
    * Do the request...
    */

    if (num_files > 1)
      response = cupsDoRequest(http, request, resource);
    else
    {
      size_t    length = 0;             /* Length of request */

      if (compatsize > 0)
      {
        fputs("DEBUG: Sending file using HTTP/1.0 Content-Length...\n", stderr);
        length = ippLength(request) + (size_t)compatsize;
      }
      else
        fputs("DEBUG: Sending file using HTTP/1.1 chunking...\n", stderr);

      http_status = cupsSendRequest(http, request, resource, length);
      if (http_status == HTTP_CONTINUE && request->state == IPP_DATA)
      {
        if (num_files == 1)
          fd = open(files[0], O_RDONLY);
        else
        {
          fd          = 0;
          http_status = cupsWriteRequestData(http, buffer, bytes);
        }

        while (http_status == HTTP_CONTINUE &&
               (!job_canceled || compatsize > 0))
        {
         /*
          * Check for side-channel requests and more print data...
          */

          FD_ZERO(&input);
          FD_SET(fd, &input);
          FD_SET(snmp_fd, &input);

          while (select(fd > snmp_fd ? fd + 1 : snmp_fd + 1, &input, NULL, NULL,
                        NULL) <= 0 && !job_canceled);

          if (FD_ISSET(snmp_fd, &input))
            backendCheckSideChannel(snmp_fd, http->hostaddr);

          if (FD_ISSET(fd, &input))
          {
            if ((bytes = read(fd, buffer, sizeof(buffer))) > 0)
            {
              fprintf(stderr, "DEBUG: Read %d bytes...\n", (int)bytes);

              if (cupsWriteRequestData(http, buffer, bytes) != HTTP_CONTINUE)
                break;
            }
            else if (bytes == 0 || (errno != EINTR && errno != EAGAIN))
              break;
          }
        }

        if (num_files == 1)
          close(fd);
      }

      response = cupsGetResponse(http, resource);
      ippDelete(request);
    }

    ipp_status = cupsLastError();

    fprintf(stderr, "DEBUG: %s: %s (%s)\n",
            num_files > 1 ? "Create-Job" : "Print-Job",
            ippErrorString(ipp_status), cupsLastErrorString());

    if (ipp_status > IPP_OK_CONFLICT)
    {
      job_id = 0;

      if (job_canceled)
        break;

      if (ipp_status == IPP_SERVICE_UNAVAILABLE ||
          ipp_status == IPP_PRINTER_BUSY)
      {
        _cupsLangPrintFilter(stderr, "INFO", _("The printer is busy."));
        sleep(10);

        if (num_files == 0)
        {
         /*
          * We can't re-submit when we have no files to print, so exit
          * immediately with the right status code...
          */

          goto cleanup;
        }
      }
      else if (ipp_status == IPP_ERROR_JOB_CANCELED)
        goto cleanup;
      else
      {
       /*
        * Update auth-info-required as needed...
        */

        _cupsLangPrintFilter(stderr, "ERROR",
                             _("Print file was not accepted."));

        if (ipp_status == IPP_NOT_AUTHORIZED || ipp_status == IPP_FORBIDDEN)
        {
          fprintf(stderr, "DEBUG: WWW-Authenticate=\"%s\"\n",
                  httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE));

         /*
          * Normal authentication goes through the password callback, which sets
          * auth_info_required to "username,password".  Kerberos goes directly
          * through GSSAPI, so look for Negotiate in the WWW-Authenticate header
          * here and set auth_info_required as needed...
          */

          if (!strncmp(httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE),
                       "Negotiate", 9))
            auth_info_required = "negotiate";
        }
        else
          sleep(10);

        if (num_files == 0)
        {
         /*
          * We can't re-submit when we have no files to print, so exit
          * immediately with the right status code...
          */

          goto cleanup;
        }
      }
    }
    else if ((job_id_attr = ippFindAttribute(response, "job-id",
                                             IPP_TAG_INTEGER)) == NULL)
    {
      _cupsLangPrintFilter(stderr, "INFO",
                           _("Print file accepted - job ID unknown."));
      update_reasons(NULL, "+cups-ipp-conformance-failure-report,"
                           "cups-ipp-missing-job-id");
      job_id = 0;
    }
    else
    {
      monitor.job_id = job_id = job_id_attr->values[0].integer;
      _cupsLangPrintFilter(stderr, "INFO",
                           _("Print file accepted - job ID %d."), job_id);
    }

    ippDelete(response);

    if (job_canceled)
      break;

    if (job_id && num_files > 1)
    {
      for (i = 0; i < num_files; i ++)
      {
       /*
        * Check for side-channel requests...
        */

        backendCheckSideChannel(snmp_fd, http->hostaddr);

       /*
        * Send the next file in the job...
        */

        request = ippNewRequest(IPP_SEND_DOCUMENT);
        request->request.op.version[0] = version / 10;
        request->request.op.version[1] = version % 10;

        ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_URI, "printer-uri",
                     NULL, uri);

        ippAddInteger(request, IPP_TAG_OPERATION, IPP_TAG_INTEGER, "job-id",
                      job_id);

        if (argv[2][0])
          ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_NAME,
                       "requesting-user-name", NULL, argv[2]);

        if ((i + 1) == num_files)
          ippAddBoolean(request, IPP_TAG_OPERATION, "last-document", 1);

        ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_MIMETYPE,
                     "document-format", NULL, content_type);

        fprintf(stderr, "DEBUG: Sending file %d using chunking...\n", i + 1);
        http_status = cupsSendRequest(http, request, resource, 0);
        if (http_status == HTTP_CONTINUE && request->state == IPP_DATA &&
            (fd = open(files[i], O_RDONLY)) >= 0)
        {
          while (!job_canceled &&
                 (bytes = read(fd, buffer, sizeof(buffer))) > 0)
          {
            if (cupsWriteRequestData(http, buffer, bytes) != HTTP_CONTINUE)
              break;
            else
            {
             /*
              * Check for side-channel requests...
              */

              backendCheckSideChannel(snmp_fd, http->hostaddr);
            }
          }

          close(fd);
        }

        ippDelete(cupsGetResponse(http, resource));
        ippDelete(request);

        fprintf(stderr, "DEBUG: Send-Document: %s (%s)\n",
                ippErrorString(cupsLastError()), cupsLastErrorString());

        if (cupsLastError() > IPP_OK_CONFLICT)
        {
          ipp_status = cupsLastError();

          _cupsLangPrintFilter(stderr, "ERROR",
                               _("Unable to add document to print job."));
          break;
        }
      }
    }

    if (ipp_status <= IPP_OK_CONFLICT && argc > 6)
    {
      fprintf(stderr, "PAGE: 1 %d\n", copies_sup ? atoi(argv[4]) : 1);
      copies_remaining --;
    }
    else if (ipp_status == IPP_SERVICE_UNAVAILABLE ||
             ipp_status == IPP_PRINTER_BUSY)
      continue;
    else
      copies_remaining --;

   /*
    * Wait for the job to complete...
    */

    if (!job_id || !waitjob)
      continue;

    _cupsLangPrintFilter(stderr, "INFO", _("Waiting for job to complete."));

    for (delay = _cupsNextDelay(0, &prev_delay); !job_canceled;)
    {
     /*
      * Check for side-channel requests...
      */

      backendCheckSideChannel(snmp_fd, http->hostaddr);

     /*
      * Build an IPP_GET_JOB_ATTRIBUTES request...
      */

      request = ippNewRequest(IPP_GET_JOB_ATTRIBUTES);
      request->request.op.version[0] = version / 10;
      request->request.op.version[1] = version % 10;

      ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_URI, "printer-uri",
                   NULL, uri);

      ippAddInteger(request, IPP_TAG_OPERATION, IPP_TAG_INTEGER, "job-id",
                    job_id);

      if (argv[2][0])
        ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_NAME,
                     "requesting-user-name", NULL, argv[2]);

      ippAddStrings(request, IPP_TAG_OPERATION, IPP_TAG_KEYWORD,
                    "requested-attributes", sizeof(jattrs) / sizeof(jattrs[0]),
                    NULL, jattrs);

     /*
      * Do the request...
      */

      httpReconnect(http);
      response   = cupsDoRequest(http, request, resource);
      ipp_status = cupsLastError();

      if (ipp_status == IPP_NOT_FOUND)
      {
       /*
        * Job has gone away and/or the server has no job history...
        */

        update_reasons(NULL, "+cups-ipp-conformance-failure-report,"
                             "cups-ipp-missing-job-history");
        ippDelete(response);

        ipp_status = IPP_OK;
        break;
      }

      fprintf(stderr, "DEBUG: Get-Job-Attributes: %s (%s)\n",
              ippErrorString(ipp_status), cupsLastErrorString());

      if (ipp_status > IPP_OK_CONFLICT)
      {
        if (ipp_status != IPP_SERVICE_UNAVAILABLE &&
            ipp_status != IPP_PRINTER_BUSY)
        {
          ippDelete(response);

          _cupsLangPrintFilter(stderr, "ERROR",
                               _("Unable to get print job status."));
          break;
        }
      }

      if (response)
      {
        if ((job_state = ippFindAttribute(response, "job-state",
                                          IPP_TAG_ENUM)) != NULL)
        {
         /*
          * Reflect the remote job state in the local queue...
          */

          if (cups_version &&
              job_state->values[0].integer >= IPP_JOB_PENDING &&
              job_state->values[0].integer <= IPP_JOB_COMPLETED)
            update_reasons(NULL,
                           remote_job_states[job_state->values[0].integer -
                                             IPP_JOB_PENDING]);

          if ((job_sheets = ippFindAttribute(response,
                                             "job-media-sheets-completed",
                                             IPP_TAG_INTEGER)) == NULL)
            job_sheets = ippFindAttribute(response,
                                          "job-impressions-completed",
                                          IPP_TAG_INTEGER);

          if (job_sheets)
            fprintf(stderr, "PAGE: total %d\n",
                    job_sheets->values[0].integer);

         /*
          * Stop polling if the job is finished or pending-held...
          */

          if (job_state->values[0].integer > IPP_JOB_STOPPED)
          {
            ippDelete(response);
            break;
          }
        }
        else
        {
         /*
          * If the printer does not return a job-state attribute, it does not
          * conform to the IPP specification - break out immediately and fail
          * the job...
          */

          update_reasons(NULL, "+cups-ipp-conformance-failure-report,"
                               "cups-ipp-missing-job-state");
          ipp_status = IPP_INTERNAL_ERROR;
          break;
        }
      }

      ippDelete(response);

     /*
      * Wait before polling again...
      */

      sleep(delay);

      delay = _cupsNextDelay(delay, &prev_delay);
    }
  }

 /*
  * Cancel the job as needed...
  */

  if (job_canceled && job_id)
    cancel_job(http, uri, job_id, resource, argv[2], version);

 /*
  * Check the printer state and report it if necessary...
  */

  check_printer_state(http, uri, resource, argv[2], version);

 /*
  * Collect the final page count as needed...
  */

  if (have_supplies &&
      !backendSNMPSupplies(snmp_fd, http->hostaddr, &page_count, NULL) &&
      page_count > start_count)
    fprintf(stderr, "PAGE: total %d\n", page_count - start_count);

#ifdef HAVE_GSSAPI
 /*
  * See if we used Kerberos at all...
  */

  if (http->gssctx)
    auth_info_required = "negotiate";
#endif /* HAVE_GSSAPI */

 /*
  * Free memory...
  */

  cleanup:

  cupsFreeOptions(num_options, options);
  _ppdCacheDestroy(pc);

  httpClose(http);

  ippDelete(supported);

 /*
  * Remove the temporary file(s) if necessary...
  */

  if (tmpfilename[0])
    unlink(tmpfilename);

#ifdef HAVE_LIBZ
  if (compression)
  {
    for (i = 0; i < num_files; i ++)
      unlink(files[i]);
  }
#endif /* HAVE_LIBZ */

 /*
  * Return the queue status...
  */

  if (ipp_status == IPP_NOT_AUTHORIZED || ipp_status == IPP_FORBIDDEN ||
      ipp_status == IPP_AUTHENTICATION_CANCELED ||
      ipp_status <= IPP_OK_CONFLICT)
    fprintf(stderr, "ATTR: auth-info-required=%s\n", auth_info_required);

  if (ipp_status == IPP_NOT_AUTHORIZED || ipp_status == IPP_FORBIDDEN ||
      ipp_status == IPP_AUTHENTICATION_CANCELED)
    return (CUPS_BACKEND_AUTH_REQUIRED);
  else if (ipp_status == IPP_INTERNAL_ERROR)
    return (CUPS_BACKEND_STOP);
  else if (ipp_status == IPP_DOCUMENT_FORMAT ||
           ipp_status == IPP_CONFLICT)
    return (CUPS_BACKEND_FAILED);
  else if (ipp_status > IPP_OK_CONFLICT && ipp_status != IPP_ERROR_JOB_CANCELED)
    return (CUPS_BACKEND_RETRY_CURRENT);
  else
  {
    _cupsLangPrintFilter(stderr, "INFO", _("Ready to print."));
    return (CUPS_BACKEND_OK);
  }
}


/*
 * 'cancel_job()' - Cancel a print job.
 */

static void
cancel_job(http_t     *http,            /* I - HTTP connection */
           const char *uri,             /* I - printer-uri */
           int        id,               /* I - job-id */
           const char *resource,        /* I - Resource path */
           const char *user,            /* I - requesting-user-name */
           int        version)          /* I - IPP version */
{
  ipp_t *request;                       /* Cancel-Job request */


  _cupsLangPrintFilter(stderr, "INFO", _("Canceling print job."));

  request = ippNewRequest(IPP_CANCEL_JOB);
  request->request.op.version[0] = version / 10;
  request->request.op.version[1] = version % 10;

  ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_URI, "printer-uri",
               NULL, uri);
  ippAddInteger(request, IPP_TAG_OPERATION, IPP_TAG_INTEGER, "job-id", id);

  if (user && user[0])
    ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_NAME,
                 "requesting-user-name", NULL, user);

 /*
  * Do the request...
  */

  ippDelete(cupsDoRequest(http, request, resource));

  if (cupsLastError() > IPP_OK_CONFLICT)
    _cupsLangPrintFilter(stderr, "ERROR", _("Unable to cancel print job."));
}


/*
 * 'check_printer_state()' - Check the printer state.
 */

static ipp_pstate_t                     /* O - Current printer-state */
check_printer_state(
    http_t      *http,                  /* I - HTTP connection */
    const char  *uri,                   /* I - Printer URI */
    const char  *resource,              /* I - Resource path */
    const char  *user,                  /* I - Username, if any */
    int         version)                /* I - IPP version */
 {
  ipp_t         *request,               /* IPP request */
                *response;              /* IPP response */
  ipp_attribute_t *attr;                /* Attribute in response */
  ipp_pstate_t  printer_state = IPP_PRINTER_STOPPED;
                                        /* Current printer-state */


 /*
  * Send a Get-Printer-Attributes request and log the results...
  */

  request = ippNewRequest(IPP_GET_PRINTER_ATTRIBUTES);
  request->request.op.version[0] = version / 10;
  request->request.op.version[1] = version % 10;

  ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_URI, "printer-uri",
               NULL, uri);

  if (user && user[0])
    ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_NAME,
                 "requesting-user-name", NULL, user);

  ippAddStrings(request, IPP_TAG_OPERATION, IPP_TAG_KEYWORD,
                "requested-attributes",
                (int)(sizeof(pattrs) / sizeof(pattrs[0])), NULL, pattrs);

  if ((response = cupsDoRequest(http, request, resource)) != NULL)
  {
    report_printer_state(response);

    if ((attr = ippFindAttribute(response, "printer-state",
                                 IPP_TAG_ENUM)) != NULL)
      printer_state = (ipp_pstate_t)attr->values[0].integer;

    ippDelete(response);
  }

  fprintf(stderr, "DEBUG: Get-Printer-Attributes: %s (%s)\n",
          ippErrorString(cupsLastError()), cupsLastErrorString());

 /*
  * Return the printer-state value...
  */

  return (printer_state);
}


#ifdef HAVE_LIBZ
/*
 * 'compress_files()' - Compress print files.
 */

static void
compress_files(int  num_files,          /* I - Number of files */
               char **files)            /* I - Files */
{
  int           i,                      /* Looping var */
                fd;                     /* Temporary file descriptor */
  ssize_t       bytes;                  /* Bytes read/written */
  size_t        total;                  /* Total bytes read */
  cups_file_t   *in,                    /* Input file */
                *out;                   /* Output file */
  struct stat   outinfo;                /* Output file information */
  char          filename[1024],         /* Temporary filename */
                buffer[32768];          /* Copy buffer */


  fprintf(stderr, "DEBUG: Compressing %d job files...\n", num_files);
  for (i = 0; i < num_files; i ++)
  {
    if ((fd = cupsTempFd(filename, sizeof(filename))) < 0)
    {
      _cupsLangPrintError("ERROR", _("Unable to create compressed print file"));
      exit(CUPS_BACKEND_FAILED);
    }

    if ((out = cupsFileOpenFd(fd, "w9")) == NULL)
    {
      _cupsLangPrintError("ERROR", _("Unable to open compressed print file"));
      exit(CUPS_BACKEND_FAILED);
    }

    if ((in = cupsFileOpen(files[i], "r")) == NULL)
    {
      _cupsLangPrintError("ERROR", _("Unable to open print file"));
      cupsFileClose(out);
      exit(CUPS_BACKEND_FAILED);
    }

    total = 0;
    while ((bytes = cupsFileRead(in, buffer, sizeof(buffer))) > 0)
      if (cupsFileWrite(out, buffer, bytes) < bytes)
      {
        _cupsLangPrintError("ERROR",
                            _("Unable to generate compressed print file"));
        cupsFileClose(in);
        cupsFileClose(out);
        exit(CUPS_BACKEND_FAILED);
      }
      else
        total += bytes;

    cupsFileClose(out);
    cupsFileClose(in);

    files[i] = strdup(filename);

    if (!stat(filename, &outinfo))
      fprintf(stderr,
              "DEBUG: File %d compressed to %.1f%% of original size, "
              CUPS_LLFMT " bytes...\n",
              i + 1, 100.0 * outinfo.st_size / total,
              CUPS_LLCAST outinfo.st_size);
  }
}
#endif /* HAVE_LIBZ */


/*
 * 'monitor_printer()' - Monitor the printer state.
 */

static void *                           /* O - Thread exit code */
monitor_printer(
    _cups_monitor_t *monitor)           /* I - Monitoring data */
{
  http_t        *http;                  /* Connection to printer */
  ipp_t         *request,               /* IPP request */
                *response;              /* IPP response */
  ipp_attribute_t *attr;                /* Attribute in response */
  int           delay,                  /* Current delay */
                prev_delay;             /* Previous delay */


 /*
  * Make a copy of the printer connection...
  */

  http = _httpCreate(monitor->hostname, monitor->port, NULL, monitor->encryption,
                     AF_UNSPEC);
  httpSetTimeout(http, 30.0, timeout_cb, NULL);
  cupsSetPasswordCB(password_cb);

 /*
  * Loop until the job is canceled, aborted, or completed.
  */

  delay = _cupsNextDelay(0, &prev_delay);

  while (monitor->job_state < IPP_JOB_CANCELED && !job_canceled)
  {
   /*
    * Reconnect to the printer...
    */

    if (!httpReconnect(http))
    {
     /*
      * Connected, so check on the printer state...
      */

      monitor->printer_state = check_printer_state(http, monitor->uri,
                                                   monitor->resource,
                                                   monitor->user,
                                                   monitor->version);

      if (monitor->job_id > 0)
      {
       /*
        * Check the status of the job itself...
        */

        request = ippNewRequest(IPP_GET_JOB_ATTRIBUTES);
        request->request.op.version[0] = monitor->version / 10;
        request->request.op.version[1] = monitor->version % 10;

        ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_URI, "printer-uri",
                     NULL, monitor->uri);
        ippAddInteger(request, IPP_TAG_OPERATION, IPP_TAG_INTEGER, "job-id",
                      monitor->job_id);

        if (monitor->user && monitor->user[0])
          ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_NAME,
                       "requesting-user-name", NULL, monitor->user);

        ippAddStrings(request, IPP_TAG_OPERATION, IPP_TAG_KEYWORD,
                      "requested-attributes",
                      (int)(sizeof(jattrs) / sizeof(jattrs[0])), NULL, jattrs);

       /*
        * Do the request...
        */

        response = cupsDoRequest(http, request, monitor->resource);

        fprintf(stderr, "DEBUG: Get-Job-Attributes: %s (%s)\n",
                ippErrorString(cupsLastError()), cupsLastErrorString());

        if ((attr = ippFindAttribute(response, "job-state",
                                     IPP_TAG_ENUM)) != NULL)
          monitor->job_state = (ipp_jstate_t)attr->values[0].integer;
        else
          monitor->job_state = IPP_JOB_COMPLETED;

        ippDelete(response);
      }

     /*
      * Disconnect from the printer - we'll reconnect on the next poll...
      */

      _httpDisconnect(http);
    }

   /*
    * Sleep for N seconds...
    */

    sleep(delay);

    delay = _cupsNextDelay(delay, &prev_delay);
  }

 /*
  * Cleanup and return...
  */

  httpClose(http);

  return (NULL);
}


/*
 * 'new_request()' - Create a new print creation or validation request.
 */

static ipp_t *                          /* O - Request data */
new_request(
    ipp_op_t        op,                 /* I - IPP operation code */
    int             version,            /* I - IPP version number */
    const char      *uri,               /* I - printer-uri value */
    const char      *user,              /* I - requesting-user-name value */
    const char      *title,             /* I - job-name value */
    int             num_options,        /* I - Number of options to send */
    cups_option_t   *options,           /* I - Options to send */
    const char      *compression,       /* I - compression value or NULL */
    int             copies,             /* I - copies value or 0 */
    const char      *format,            /* I - documet-format value or NULL */
    _ppd_cache_t    *pc,                /* I - PPD cache and mapping data */
    ipp_attribute_t *media_col_sup,     /* I - media-col-supported values */
    ipp_attribute_t *doc_handling_sup)  /* I - multiple-document-handling-supported values */
{
  int           i;                      /* Looping var */
  ipp_t         *request;               /* Request data */
  const char    *keyword;               /* PWG keyword */
  _pwg_size_t   *size;                  /* PWG media size */
  ipp_t         *media_col,             /* media-col value */
                *media_size;            /* media-size value */
  const char    *media_source,          /* media-source value */
                *media_type,            /* media-type value */
                *collate_str;           /* multiple-document-handling value */


 /*
  * Create the IPP request...
  */

  request                        = ippNewRequest(op);
  request->request.op.version[0] = version / 10;
  request->request.op.version[1] = version % 10;

  fprintf(stderr, "DEBUG: %s IPP/%d.%d\n",
          ippOpString(request->request.op.operation_id),
          request->request.op.version[0],
          request->request.op.version[1]);

 /*
  * Add standard attributes...
  */

  ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_URI, "printer-uri",
               NULL, uri);
  fprintf(stderr, "DEBUG: printer-uri=\"%s\"\n", uri);

  if (user && *user)
  {
    ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_NAME,
                 "requesting-user-name", NULL, user);
    fprintf(stderr, "DEBUG: requesting-user-name=\"%s\"\n", user);
  }

  if (title && *title)
  {
    ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_NAME, "job-name", NULL,
                 title);
    fprintf(stderr, "DEBUG: job-name=\"%s\"\n", title);
  }

  if (format)
  {
    ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_MIMETYPE,
                 "document-format", NULL, format);
    fprintf(stderr, "DEBUG: document-format=\"%s\"\n", format);
  }

#ifdef HAVE_LIBZ
  if (compression)
  {
    ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_KEYWORD,
                 "compression", NULL, compression);
    fprintf(stderr, "DEBUG: compression=\"%s\"\n", compression);
  }
#endif /* HAVE_LIBZ */

 /*
  * Handle options on the command-line...
  */

  if (num_options > 0)
  {
    if (pc)
    {
     /*
      * Send standard IPP attributes...
      */

      if ((keyword = cupsGetOption("PageSize", num_options, options)) == NULL)
        keyword = cupsGetOption("media", num_options, options);

      if ((size = _ppdCacheGetSize(pc, keyword)) != NULL)
      {
       /*
        * Add a media-col value...
        */

        media_size = ippNew();
        ippAddInteger(media_size, IPP_TAG_ZERO, IPP_TAG_INTEGER,
                      "x-dimension", size->width);
        ippAddInteger(media_size, IPP_TAG_ZERO, IPP_TAG_INTEGER,
                      "y-dimension", size->length);

        media_col = ippNew();
        ippAddCollection(media_col, IPP_TAG_ZERO, "media-size", media_size);

        media_source = _ppdCacheGetSource(pc, cupsGetOption("InputSlot",
                                                            num_options,
                                                            options));
        media_type   = _ppdCacheGetType(pc, cupsGetOption("MediaType",
                                                          num_options,
                                                          options));

        for (i = 0; i < media_col_sup->num_values; i ++)
        {
          if (!strcmp(media_col_sup->values[i].string.text,
                      "media-left-margin"))
            ippAddInteger(media_col, IPP_TAG_ZERO, IPP_TAG_INTEGER,
                          "media-left-margin", size->left);
          else if (!strcmp(media_col_sup->values[i].string.text,
                           "media-bottom-margin"))
            ippAddInteger(media_col, IPP_TAG_ZERO, IPP_TAG_INTEGER,
                          "media-bottom-margin", size->bottom);
          else if (!strcmp(media_col_sup->values[i].string.text,
                           "media-right-margin"))
            ippAddInteger(media_col, IPP_TAG_ZERO, IPP_TAG_INTEGER,
                          "media-right-margin", size->right);
          else if (!strcmp(media_col_sup->values[i].string.text,
                           "media-top-margin"))
            ippAddInteger(media_col, IPP_TAG_ZERO, IPP_TAG_INTEGER,
                          "media-top-margin", size->top);
          else if (!strcmp(media_col_sup->values[i].string.text,
                           "media-source") && media_source)
            ippAddString(media_col, IPP_TAG_ZERO, IPP_TAG_KEYWORD,
                         "media-source", NULL, media_source);
          else if (!strcmp(media_col_sup->values[i].string.text,
                           "media-type") && media_type)
            ippAddString(media_col, IPP_TAG_ZERO, IPP_TAG_KEYWORD,
                         "media-type", NULL, media_type);
        }

        ippAddCollection(request, IPP_TAG_JOB, "media-col", media_col);
      }

      if ((keyword = cupsGetOption("output-bin", num_options,
                                   options)) == NULL)
        keyword = _ppdCacheGetBin(pc, cupsGetOption("OutputBin", num_options,
                                                    options));

      if (keyword)
        ippAddString(request, IPP_TAG_JOB, IPP_TAG_KEYWORD, "output-bin",
                     NULL, keyword);

      if ((keyword = cupsGetOption("output-mode", num_options,
                                   options)) != NULL)
        ippAddString(request, IPP_TAG_JOB, IPP_TAG_KEYWORD, "output-mode",
                     NULL, keyword);
      else if ((keyword = cupsGetOption("ColorModel", num_options,
                                        options)) != NULL)
      {
        if (!_cups_strcasecmp(keyword, "Gray"))
          ippAddString(request, IPP_TAG_JOB, IPP_TAG_KEYWORD, "output-mode",
                               NULL, "monochrome");
        else
          ippAddString(request, IPP_TAG_JOB, IPP_TAG_KEYWORD, "output-mode",
                           NULL, "color");
      }

      if ((keyword = cupsGetOption("print-quality", num_options,
                                   options)) != NULL)
        ippAddInteger(request, IPP_TAG_JOB, IPP_TAG_ENUM, "print-quality",
                      atoi(keyword));
      else if ((keyword = cupsGetOption("cupsPrintQuality", num_options,
                                        options)) != NULL)
      {
        if (!_cups_strcasecmp(keyword, "draft"))
          ippAddInteger(request, IPP_TAG_JOB, IPP_TAG_ENUM, "print-quality",
                        IPP_QUALITY_DRAFT);
        else if (!_cups_strcasecmp(keyword, "normal"))
          ippAddInteger(request, IPP_TAG_JOB, IPP_TAG_ENUM, "print-quality",
                        IPP_QUALITY_NORMAL);
        else if (!_cups_strcasecmp(keyword, "high"))
          ippAddInteger(request, IPP_TAG_JOB, IPP_TAG_ENUM, "print-quality",
                        IPP_QUALITY_HIGH);
      }

      if ((keyword = cupsGetOption("sides", num_options, options)) != NULL)
        ippAddString(request, IPP_TAG_JOB, IPP_TAG_KEYWORD, "sides",
                     NULL, keyword);
      else if (pc->sides_option &&
               (keyword = cupsGetOption(pc->sides_option, num_options,
                                        options)) != NULL)
      {
        if (!_cups_strcasecmp(keyword, pc->sides_1sided))
          ippAddString(request, IPP_TAG_JOB, IPP_TAG_KEYWORD, "sides",
                       NULL, "one-sided");
        else if (!_cups_strcasecmp(keyword, pc->sides_2sided_long))
          ippAddString(request, IPP_TAG_JOB, IPP_TAG_KEYWORD, "sides",
                       NULL, "two-sided-long-edge");
        if (!_cups_strcasecmp(keyword, pc->sides_2sided_short))
          ippAddString(request, IPP_TAG_JOB, IPP_TAG_KEYWORD, "sides",
                       NULL, "two-sided-short-edge");
      }

      if (doc_handling_sup &&
          (keyword = cupsGetOption("collate", num_options, options)) != NULL)
      {
        if (!_cups_strcasecmp(keyword, "true"))
          collate_str = "separate-documents-collated-copies";
        else
          collate_str = "separate-documents-uncollated-copies";

        for (i = 0; i < doc_handling_sup->num_values; i ++)
          if (!strcmp(doc_handling_sup->values[i].string.text, collate_str))
          {
            ippAddString(request, IPP_TAG_JOB, IPP_TAG_KEYWORD,
                         "multiple-document-handling", NULL, collate_str);
            break;
          }
      }
    }
    else
    {
     /*
      * When talking to another CUPS server, send all options...
      */

      cupsEncodeOptions(request, num_options, options);
    }

    if (copies > 1)
      ippAddInteger(request, IPP_TAG_JOB, IPP_TAG_INTEGER, "copies", copies);
  }

  return (request);
}


/*
 * 'password_cb()' - Disable the password prompt for cupsDoFileRequest().
 */

static const char *                     /* O - Password  */
password_cb(const char *prompt)         /* I - Prompt (not used) */
{
  (void)prompt;

 /*
  * Remember that we need to authenticate...
  */

  auth_info_required = "username,password";

  if (password && *password && password_tries < 3)
  {
    password_tries ++;

    return (password);
  }
  else
  {
   /*
    * Give up after 3 tries or if we don't have a password to begin with...
    */

    return (NULL);
  }
}


/*
 * 'report_attr()' - Report an IPP attribute value.
 */

static void
report_attr(ipp_attribute_t *attr)      /* I - Attribute */
{
  int           i;                      /* Looping var */
  char          value[1024],            /* Value string */
                *valptr,                /* Pointer into value string */
                *attrptr;               /* Pointer into attribute value */
  const char    *cached;                /* Cached attribute */


 /*
  * Convert the attribute values into quoted strings...
  */

  for (i = 0, valptr = value;
       i < attr->num_values && valptr < (value + sizeof(value) - 10);
       i ++)
  {
    if (i > 0)
      *valptr++ = ',';

    switch (attr->value_tag)
    {
      case IPP_TAG_INTEGER :
      case IPP_TAG_ENUM :
          snprintf(valptr, sizeof(value) - (valptr - value), "%d",
                   attr->values[i].integer);
          valptr += strlen(valptr);
          break;

      case IPP_TAG_TEXT :
      case IPP_TAG_NAME :
      case IPP_TAG_KEYWORD :
          *valptr++ = '\"';
          for (attrptr = attr->values[i].string.text;
               *attrptr && valptr < (value + sizeof(value) - 10);
               attrptr ++)
          {
            if (*attrptr == '\\' || *attrptr == '\"')
              *valptr++ = '\\';

            *valptr++ = *attrptr;
          }
          *valptr++ = '\"';
          break;

      default :
         /*
          * Unsupported value type...
          */

          return;
    }
  }

  *valptr = '\0';

  _cupsMutexLock(&report_mutex);

  if ((cached = cupsGetOption(attr->name, num_attr_cache,
                              attr_cache)) == NULL || strcmp(cached, value))
  {
   /*
    * Tell the scheduler about the new values...
    */

    num_attr_cache = cupsAddOption(attr->name, value, num_attr_cache,
                                   &attr_cache);
    fprintf(stderr, "ATTR: %s=%s\n", attr->name, value);
  }

  _cupsMutexUnlock(&report_mutex);
}


/*
 * 'report_printer_state()' - Report the printer state.
 */

static void
report_printer_state(ipp_t *ipp)        /* I - IPP response */
{
  ipp_attribute_t       *pa,            /* printer-alert */
                        *pam,           /* printer-alert-message */
                        *psm,           /* printer-state-message */
                        *reasons,       /* printer-state-reasons */
                        *marker;        /* marker-* attributes */
  char                  value[1024],    /* State/message string */
                        *valptr;        /* Pointer into string */
  static int            ipp_supplies = -1;
                                        /* Report supply levels? */


 /*
  * Report alerts and messages...
  */

  if ((pa = ippFindAttribute(ipp, "printer-alert", IPP_TAG_TEXT)) != NULL)
    report_attr(pa);

  if ((pam = ippFindAttribute(ipp, "printer-alert-message",
                              IPP_TAG_TEXT)) != NULL)
    report_attr(pam);

  if ((psm = ippFindAttribute(ipp, "printer-state-message",
                              IPP_TAG_TEXT)) != NULL)
  {
    char        *ptr;                   /* Pointer into message */


    strlcpy(value, "INFO: ", sizeof(value));
    for (ptr = psm->values[0].string.text, valptr = value + 6;
         *ptr && valptr < (value + sizeof(value) - 6);
         ptr ++)
    {
      if (*ptr < ' ' && *ptr > 0 && *ptr != '\t')
      {
       /*
        * Substitute "<XX>" for the control character; sprintf is safe because
        * we always leave 6 chars free at the end...
        */

        sprintf(valptr, "<%02X>", *ptr);
        valptr += 4;
      }
      else
        *valptr++ = *ptr;
    }

    *valptr++ = '\n';
    *valptr   = '\0';

    fputs(value, stderr);
  }

 /*
  * Now report printer-state-reasons, filtering out some of the reasons we never
  * want to set...
  */

  if ((reasons = ippFindAttribute(ipp, "printer-state-reasons",
                                  IPP_TAG_KEYWORD)) == NULL)
    return;

  update_reasons(reasons, NULL);

 /*
  * Relay the current marker-* attribute values...
  */

  if (ipp_supplies < 0)
  {
    ppd_file_t  *ppd;                   /* PPD file */
    ppd_attr_t  *ppdattr;               /* Attribute in PPD file */

    if ((ppd = ppdOpenFile(getenv("PPD"))) != NULL &&
        (ppdattr = ppdFindAttr(ppd, "cupsIPPSupplies", NULL)) != NULL &&
        ppdattr->value && _cups_strcasecmp(ppdattr->value, "true"))
      ipp_supplies = 0;
    else
      ipp_supplies = 1;

    ppdClose(ppd);
  }

  if (ipp_supplies > 0)
  {
    if ((marker = ippFindAttribute(ipp, "marker-colors", IPP_TAG_NAME)) != NULL)
      report_attr(marker);
    if ((marker = ippFindAttribute(ipp, "marker-high-levels",
                                   IPP_TAG_INTEGER)) != NULL)
      report_attr(marker);
    if ((marker = ippFindAttribute(ipp, "marker-levels",
                                   IPP_TAG_INTEGER)) != NULL)
      report_attr(marker);
    if ((marker = ippFindAttribute(ipp, "marker-low-levels",
                                   IPP_TAG_INTEGER)) != NULL)
      report_attr(marker);
    if ((marker = ippFindAttribute(ipp, "marker-message",
                                   IPP_TAG_TEXT)) != NULL)
      report_attr(marker);
    if ((marker = ippFindAttribute(ipp, "marker-names", IPP_TAG_NAME)) != NULL)
      report_attr(marker);
    if ((marker = ippFindAttribute(ipp, "marker-types",
                                   IPP_TAG_KEYWORD)) != NULL)
      report_attr(marker);
  }
}


#if defined(HAVE_GSSAPI) && defined(HAVE_XPC)
/*
 * 'run_as_user()' - Run the IPP backend as the printing user.
 *
 * This function uses an XPC-based user agent to run the backend as the printing
 * user. We need to do this in order to have access to the user's Kerberos
 * credentials.
 */

static int                              /* O - Exit status */
run_as_user(int        argc,            /* I - Number of command-line args */
            char       *argv[],         /* I - Command-line arguments */
            uid_t      uid,             /* I - User ID */
            const char *device_uri,     /* I - Device URI */
            int        fd)              /* I - File to print */
{
  const char            *auth_negotiate;/* AUTH_NEGOTIATE env var */
  xpc_connection_t      conn;           /* Connection to XPC service */
  xpc_object_t          request;        /* Request message dictionary */
  __block xpc_object_t  response;       /* Response message dictionary */
  dispatch_semaphore_t  sem;            /* Semaphore for waiting for response */
  int                   status = CUPS_BACKEND_FAILED;
                                        /* Status of request */


  fprintf(stderr, "DEBUG: Running IPP backend as UID %d.\n", (int)uid);

 /*
  * Connect to the user agent for the specified UID...
  */

  conn = xpc_connection_create_mach_service(kPMPrintUIToolAgent,
                                            dispatch_get_global_queue(0, 0), 0);
  if (!conn)
  {
    _cupsLangPrintFilter(stderr, "ERROR",
                         _("Unable to start backend process."));
    fputs("DEBUG: Unable to create connection to agent.\n", stderr);
    goto cleanup;
  }

  xpc_connection_set_event_handler(conn,
                                   ^(xpc_object_t event)
                                   {
                                     xpc_type_t messageType = xpc_get_type(event);

                                     if (messageType == XPC_TYPE_ERROR)
                                     {
                                       if (event == XPC_ERROR_CONNECTION_INTERRUPTED)
                                         fprintf(stderr, "DEBUG: Interrupted connection to service %s.\n",
                                                 xpc_connection_get_name(conn));
                                       else if (event == XPC_ERROR_CONNECTION_INVALID)
                                         fprintf(stderr, "DEBUG: Connection invalid for service %s.\n",
                                                 xpc_connection_get_name(conn));
                                       else
                                         fprintf(stderr, "DEBUG: Unxpected error for service %s: %s\n",
                                                 xpc_connection_get_name(conn),
                                                 xpc_dictionary_get_string(event, XPC_ERROR_KEY_DESCRIPTION));
                                     }
                                   });
  xpc_connection_set_target_uid(conn, uid);
  xpc_connection_resume(conn);

 /*
  * Try starting the backend...
  */

  request = xpc_dictionary_create(NULL, NULL, 0);
  xpc_dictionary_set_int64(request, "command", kPMStartJob);
  xpc_dictionary_set_string(request, "device-uri", device_uri);
  xpc_dictionary_set_string(request, "job-id", argv[1]);
  xpc_dictionary_set_string(request, "user", argv[2]);
  xpc_dictionary_set_string(request, "title", argv[3]);
  xpc_dictionary_set_string(request, "copies", argv[4]);
  xpc_dictionary_set_string(request, "options", argv[5]);
  xpc_dictionary_set_string(request, "auth-info-required",
                            getenv("AUTH_INFO_REQUIRED"));
  if ((auth_negotiate = getenv("AUTH_NEGOTIATE")) != NULL)
    xpc_dictionary_set_string(request, "auth-negotiate", auth_negotiate);
  xpc_dictionary_set_fd(request, "stdin", fd);
  xpc_dictionary_set_fd(request, "stderr", 2);
  xpc_dictionary_set_fd(request, "side-channel", CUPS_SC_FD);

  sem      = dispatch_semaphore_create(0);
  response = NULL;

  xpc_connection_send_message_with_reply(conn, request,
                                         dispatch_get_global_queue(0,0),
                                         ^(xpc_object_t reply)
                                         {
                                           /* Save the response and wake up */
                                           if (xpc_get_type(reply)
                                                   == XPC_TYPE_DICTIONARY)
                                             response = xpc_retain(reply);

                                           dispatch_semaphore_signal(sem);
                                         });

  dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
  xpc_release(request);
  dispatch_release(sem);

  if (response)
  {
    child_pid = xpc_dictionary_get_int64(response, "child-pid");

    xpc_release(response);

    if (child_pid)
      fprintf(stderr, "DEBUG: Child PID=%d.\n", child_pid);
    else
    {
      _cupsLangPrintFilter(stderr, "ERROR",
                           _("Unable to start backend process."));
      fputs("DEBUG: No child PID.\n", stderr);
      goto cleanup;
    }
  }
  else
  {
    _cupsLangPrintFilter(stderr, "ERROR",
                         _("Unable to start backend process."));
    fputs("DEBUG: No reply from agent.\n", stderr);
    goto cleanup;
  }

 /*
  * Then wait for the backend to finish...
  */

  request = xpc_dictionary_create(NULL, NULL, 0);
  xpc_dictionary_set_int64(request, "command", kPMWaitForJob);
  xpc_dictionary_set_fd(request, "stderr", 2);

  sem      = dispatch_semaphore_create(0);
  response = NULL;

  xpc_connection_send_message_with_reply(conn, request,
                                         dispatch_get_global_queue(0,0),
                                         ^(xpc_object_t reply)
                                         {
                                           /* Save the response and wake up */
                                           if (xpc_get_type(reply)
                                                   == XPC_TYPE_DICTIONARY)
                                             response = xpc_retain(reply);

                                           dispatch_semaphore_signal(sem);
                                         });

  dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
  xpc_release(request);
  dispatch_release(sem);

  if (response)
  {
    status = xpc_dictionary_get_int64(response, "status");

    if (status == SIGTERM || status == SIGKILL || status == SIGPIPE)
    {
      fprintf(stderr, "DEBUG: Child terminated on signal %d.\n", status);
      status = CUPS_BACKEND_FAILED;
    }
    else if (WIFSIGNALED(status))
    {
      fprintf(stderr, "DEBUG: Child crashed on signal %d.\n", status);
      status = CUPS_BACKEND_STOP;
    }
    else if (WIFEXITED(status))
    {
      status = WEXITSTATUS(status);
      fprintf(stderr, "DEBUG: Child exited with status %d.\n", status);
    }

    xpc_release(response);
  }
  else
    _cupsLangPrintFilter(stderr, "ERROR",
                         _("Unable to get backend exit status."));

  cleanup:

  if (conn)
  {
    xpc_connection_suspend(conn);
    xpc_connection_cancel(conn);
    xpc_release(conn);
  }

  return (status);
}
#endif /* HAVE_GSSAPI && HAVE_XPC */


/*
 * 'sigterm_handler()' - Handle 'terminate' signals that stop the backend.
 */

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

#if defined(HAVE_GSSAPI) && defined(HAVE_XPC)
  if (child_pid)
  {
    kill(child_pid, sig);
    child_pid = 0;
  }
#endif /* HAVE_GSSAPI && HAVE_XPC */

  if (!job_canceled)
  {
   /*
    * Flag that the job should be canceled...
    */

    job_canceled = 1;
    return;
  }

 /*
  * The scheduler already tried to cancel us once, now just terminate
  * after removing our temp file!
  */

  if (tmpfilename[0])
    unlink(tmpfilename);

  exit(1);
}


/*
 * 'timeout_cb()' - Handle HTTP timeouts.
 */

static int                              /* O - 1 to continue, 0 to cancel */
timeout_cb(http_t *http,                /* I - Connection to server (unused) */
           void   *user_data)           /* I - User data (unused) */
{
  (void)http;
  (void)user_data;

  return (!job_canceled);
}


/*
 * 'update_reasons()' - Update the printer-state-reasons values.
 */

static void
update_reasons(ipp_attribute_t *attr,   /* I - printer-state-reasons or NULL */
               const char      *s)      /* I - STATE: string or NULL */
{
  char          op;                     /* Add (+), remove (-), replace (\0) */
  cups_array_t  *new_reasons;           /* New reasons array */
  char          *reason,                /* Current reason */
                add[2048],              /* Reasons added string */
                *addptr,                /* Pointer into add string */
                rem[2048],              /* Reasons removed string */
                *remptr;                /* Pointer into remove string */
  const char    *addprefix,             /* Current add string prefix */
                *remprefix;             /* Current remove string prefix */


  fprintf(stderr, "DEBUG: update_reasons(attr=%d(%s%s), s=\"%s\")\n",
          attr ? attr->num_values : 0, attr ? attr->values[0].string.text : "",
          attr && attr->num_values > 1 ? ",..." : "", s ? s : "(null)");

 /*
  * Create an array of new reason keyword strings...
  */

  if (attr)
  {
    int i;                              /* Looping var */

    new_reasons = cupsArrayNew((cups_array_func_t)strcmp, NULL);
    op          = '\0';

    for (i = 0; i < attr->num_values; i ++)
    {
      reason = attr->values[i].string.text;

      if (strcmp(reason, "none") &&
          strcmp(reason, "none-report") &&
          strcmp(reason, "paused") &&
          strncmp(reason, "spool-area-full", 15) &&
          strcmp(reason, "com.apple.print.recoverable-warning") &&
          strncmp(reason, "cups-", 5))
        cupsArrayAdd(new_reasons, reason);
    }
  }
  else if (s)
  {
    if (*s == '+' || *s == '-')
      op = *s++;
    else
      op = '\0';

    new_reasons = _cupsArrayNewStrings(s);
  }
  else
    return;

 /*
  * Compute the changes...
  */

  add[0]    = '\0';
  addprefix = "STATE: +";
  addptr    = add;
  rem[0]    = '\0';
  remprefix = "STATE: -";
  remptr    = rem;

  fprintf(stderr, "DEBUG2: op='%c', new_reasons=%d, state_reasons=%d\n",
          op ? op : ' ', cupsArrayCount(new_reasons),
          cupsArrayCount(state_reasons));

  _cupsMutexLock(&report_mutex);

  if (op == '+')
  {
   /*
    * Add reasons...
    */

    for (reason = (char *)cupsArrayFirst(new_reasons);
         reason;
         reason = (char *)cupsArrayNext(new_reasons))
    {
      if (!cupsArrayFind(state_reasons, reason))
      {
        if (!strncmp(reason, "cups-remote-", 12))
        {
         /*
          * If we are setting cups-remote-xxx, remove all other cups-remote-xxx
          * keywords...
          */

          char  *temp;          /* Current reason in state_reasons */

          cupsArraySave(state_reasons);

          for (temp = (char *)cupsArrayFirst(state_reasons);
               temp;
               temp = (char *)cupsArrayNext(state_reasons))
            if (!strncmp(temp, "cups-remote-", 12))
            {
              snprintf(remptr, sizeof(rem) - (remptr - rem), "%s%s", remprefix,
                       temp);
              remptr    += strlen(remptr);
              remprefix = ",";

              cupsArrayRemove(state_reasons, temp);
              break;
            }

          cupsArrayRestore(state_reasons);
        }

        cupsArrayAdd(state_reasons, reason);

        snprintf(addptr, sizeof(add) - (addptr - add), "%s%s", addprefix,
                 reason);
        addptr    += strlen(addptr);
        addprefix = ",";
      }
    }
  }
  else if (op == '-')
  {
   /*
    * Remove reasons...
    */

    for (reason = (char *)cupsArrayFirst(new_reasons);
         reason;
         reason = (char *)cupsArrayNext(new_reasons))
    {
      if (cupsArrayFind(state_reasons, reason))
      {
        snprintf(remptr, sizeof(rem) - (remptr - rem), "%s%s", remprefix,
                 reason);
        remptr    += strlen(remptr);
        remprefix = ",";

        cupsArrayRemove(state_reasons, reason);
      }
    }
  }
  else
  {
   /*
    * Replace reasons...
    */

    for (reason = (char *)cupsArrayFirst(state_reasons);
         reason;
         reason = (char *)cupsArrayNext(state_reasons))
    {
      if (strncmp(reason, "cups-", 5) && !cupsArrayFind(new_reasons, reason))
      {
        snprintf(remptr, sizeof(rem) - (remptr - rem), "%s%s", remprefix,
                 reason);
        remptr    += strlen(remptr);
        remprefix = ",";

        cupsArrayRemove(state_reasons, reason);
      }
    }

    for (reason = (char *)cupsArrayFirst(new_reasons);
         reason;
         reason = (char *)cupsArrayNext(new_reasons))
    {
      if (!cupsArrayFind(state_reasons, reason))
      {
        cupsArrayAdd(state_reasons, reason);

        snprintf(addptr, sizeof(add) - (addptr - add), "%s%s", addprefix,
                 reason);
        addptr    += strlen(addptr);
        addprefix = ",";
      }
    }
  }

  _cupsMutexUnlock(&report_mutex);

 /*
  * Report changes and return...
  */

  if (add[0] && rem[0])
    fprintf(stderr, "%s\n%s\n", add, rem);
  else if (add[0])
    fprintf(stderr, "%s\n", add);
  else if (rem[0])
    fprintf(stderr, "%s\n", rem);
}

/*
 * End of "$Id: ipp.c 9759 2011-05-11 03:24:33Z mike $".
 */