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/*
* "$Id: cups-polld.c 7198 2008-01-08 00:12:17Z mike $"
*
* Polling daemon for the Common UNIX Printing System (CUPS).
*
* Copyright 2007 by Apple Inc.
* Copyright 1997-2006 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"
* 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() - Open sockets and poll until we are killed...
* dequote() - Remote quotes from a string.
* poll_server() - Poll the server for the given set of printers or
* classes.
* sighup_handler() - Handle 'hangup' signals to restart polling.
*/
/*
* Include necessary headers...
*/
#include <cups/http-private.h>
#include <cups/cups.h>
#include <stdlib.h>
#include <errno.h>
#include <cups/language.h>
#include <cups/string.h>
#include <signal.h>
/*
* Local globals...
*/
static int restart_polling = 1;
/*
* Local functions...
*/
static char *dequote(char *d, const char *s, int dlen);
static int poll_server(http_t *http, int sock, int port, int interval,
const char *prefix);
static void sighup_handler(int sig);
/*
* 'main()' - Open sockets and poll until we are killed...
*/
int /* O - Exit status */
main(int argc, /* I - Number of command-line args */
char *argv[]) /* I - Command-line arguments */
{
http_t *http; /* HTTP connection */
int interval; /* Polling interval */
int sock; /* Browser sock */
int port; /* Browser port */
int val; /* Socket option value */
int seconds, /* Seconds left from poll */
remain; /* Total remaining time to sleep */
char prefix[1024]; /* Prefix for log messages */
#if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
struct sigaction action; /* Actions for POSIX signals */
#endif /* HAVE_SIGACTION && !HAVE_SIGSET */
/*
* Catch hangup signals for when the network changes...
*/
#ifdef HAVE_SIGSET /* Use System V signals over POSIX to avoid bugs */
sigset(SIGHUP, sighup_handler);
#elif defined(HAVE_SIGACTION)
memset(&action, 0, sizeof(action));
sigemptyset(&action.sa_mask);
sigaddset(&action.sa_mask, SIGHUP);
action.sa_handler = sighup_handler;
sigaction(SIGHUP, &action, NULL);
#else
signal(SIGHUP, sighup_handler);
#endif /* HAVE_SIGSET */
/*
* Don't buffer log messages...
*/
setbuf(stderr, NULL);
/*
* The command-line must contain the following:
*
* cups-polld server server-port interval port
*/
if (argc != 5)
{
fputs("Usage: cups-polld server server-port interval port\n", stderr);
return (1);
}
interval = atoi(argv[3]);
port = atoi(argv[4]);
if (interval < 2)
interval = 2;
snprintf(prefix, sizeof(prefix), "[cups-polld %s:%d]", argv[1], atoi(argv[2]));
/*
* Open a broadcast socket...
*/
if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
{
fprintf(stderr, "ERROR: %s Unable to open broadcast socket: %s\n", prefix,
strerror(errno));
return (1);
}
/*
* Set the "broadcast" flag...
*/
val = 1;
if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &val, sizeof(val)))
{
fprintf(stderr, "ERROR: %s Unable to put socket in broadcast mode: %s\n",
prefix, strerror(errno));
close(sock);
return (1);
}
/*
* Loop forever, asking for available printers and classes...
*/
for (http = NULL; !ferror(stderr);)
{
/*
* Open a connection to the server...
*/
if (restart_polling || !http)
{
restart_polling = 0;
httpClose(http);
if ((http = httpConnectEncrypt(argv[1], atoi(argv[2]),
cupsEncryption())) == NULL)
{
fprintf(stderr, "ERROR: %s Unable to connect to %s on port %s: %s\n",
prefix, argv[1], argv[2],
h_errno ? hstrerror(h_errno) : strerror(errno));
}
}
/*
* Get the printers and classes...
*/
remain = interval;
if (http && (seconds = poll_server(http, sock, port, interval, prefix)) > 0)
remain -= seconds;
/*
* Sleep for any remaining time...
*/
if (remain > 0 && !restart_polling)
sleep(remain);
}
return (1);
}
/*
* 'dequote()' - Remote quotes from a string.
*/
static char * /* O - Dequoted string */
dequote(char *d, /* I - Destination string */
const char *s, /* I - Source string */
int dlen) /* I - Destination length */
{
char *dptr; /* Pointer into destination */
if (s)
{
for (dptr = d, dlen --; *s && dlen > 0; s ++)
if (*s != '\"')
{
*dptr++ = *s;
dlen --;
}
*dptr = '\0';
}
else
*d = '\0';
return (d);
}
/*
* 'poll_server()' - Poll the server for the given set of printers or classes.
*/
static int /* O - Number of seconds or -1 on error */
poll_server(http_t *http, /* I - HTTP connection */
int sock, /* I - Broadcast sock */
int port, /* I - Broadcast port */
int interval, /* I - Polling interval */
const char *prefix) /* I - Prefix for log messages */
{
int seconds; /* Number of seconds */
int count, /* Current number of printers/classes */
max_count; /* Maximum printers/classes per second */
ipp_t *request, /* Request data */
*response; /* Response data */
ipp_attribute_t *attr; /* Current attribute */
const char *uri; /* printer-uri */
char info[1024], /* printer-info */
job_sheets[1024],/* job-sheets-default */
location[1024], /* printer-location */
make_model[1024];
/* printer-make-and-model */
cups_ptype_t type; /* printer-type */
ipp_pstate_t state; /* printer-state */
int accepting; /* printer-is-accepting-jobs */
struct sockaddr_in addr; /* Broadcast address */
char packet[1540]; /* Data packet */
static const char * const attrs[] = /* Requested attributes */
{
"job-sheets-default",
"printer-info",
"printer-is-accepting-jobs",
"printer-location",
"printer-make-and-model",
"printer-name",
"printer-state",
"printer-type",
"printer-uri-supported"
};
/*
* Broadcast to 127.0.0.1 (localhost)
*/
memset(&addr, 0, sizeof(addr));
addr.sin_addr.s_addr = htonl(0x7f000001);
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
/*
* Build a CUPS_GET_PRINTERS request and pass along a list of the
* attributes we are interested in along with the types of printers
* (and classes) we want.
*/
request = ippNewRequest(CUPS_GET_PRINTERS);
ippAddStrings(request, IPP_TAG_OPERATION, IPP_TAG_KEYWORD,
"requested-attributes", sizeof(attrs) / sizeof(attrs[0]),
NULL, attrs);
ippAddInteger(request, IPP_TAG_OPERATION, IPP_TAG_ENUM,
"printer-type", 0);
ippAddInteger(request, IPP_TAG_OPERATION, IPP_TAG_ENUM,
"printer-type-mask",
CUPS_PRINTER_REMOTE | CUPS_PRINTER_IMPLICIT |
CUPS_PRINTER_NOT_SHARED);
/*
* Do the request and get back a response...
*/
seconds = time(NULL);
response = cupsDoRequest(http, request, "/");
if (cupsLastError() > IPP_OK_CONFLICT)
{
fprintf(stderr, "ERROR: %s CUPS-Get-Printers failed: %s\n", prefix,
cupsLastErrorString());
ippDelete(response);
return (-1);
}
if (response)
{
/*
* Figure out how many printers/classes we have...
*/
for (attr = ippFindAttribute(response, "printer-name", IPP_TAG_NAME),
max_count = 0;
attr != NULL;
attr = ippFindNextAttribute(response, "printer-name", IPP_TAG_NAME),
max_count ++);
fprintf(stderr, "DEBUG: %s Found %d printers.\n", prefix, max_count);
count = 0;
max_count = max_count / interval + 1;
/*
* Loop through the printers or classes returned in the list...
*/
for (attr = response->attrs; attr; attr = attr->next)
{
/*
* Skip leading attributes until we hit a printer...
*/
while (attr && attr->group_tag != IPP_TAG_PRINTER)
attr = attr->next;
if (!attr)
break;
/*
* Pull the needed attributes from this printer...
*/
uri = NULL;
info[0] = '\0';
job_sheets[0] = '\0';
location[0] = '\0';
make_model[0] = '\0';
type = CUPS_PRINTER_REMOTE;
accepting = 1;
state = IPP_PRINTER_IDLE;
while (attr != NULL && attr->group_tag == IPP_TAG_PRINTER)
{
if (!strcmp(attr->name, "job-sheets-default") &&
(attr->value_tag == IPP_TAG_NAME ||
attr->value_tag == IPP_TAG_KEYWORD))
{
if (attr->num_values == 1)
snprintf(job_sheets, sizeof(job_sheets), " job-sheets=%s",
attr->values[0].string.text);
else
snprintf(job_sheets, sizeof(job_sheets), " job-sheets=%s,%s",
attr->values[0].string.text,
attr->values[1].string.text);
}
else if (!strcmp(attr->name, "printer-uri-supported") &&
attr->value_tag == IPP_TAG_URI)
uri = attr->values[0].string.text;
else if (!strcmp(attr->name, "printer-info") &&
attr->value_tag == IPP_TAG_TEXT)
dequote(info, attr->values[0].string.text, sizeof(info));
else if (!strcmp(attr->name, "printer-is-accepting-jobs") &&
attr->value_tag == IPP_TAG_BOOLEAN)
accepting = attr->values[0].boolean;
else if (!strcmp(attr->name, "printer-location") &&
attr->value_tag == IPP_TAG_TEXT)
dequote(location, attr->values[0].string.text, sizeof(location));
else if (!strcmp(attr->name, "printer-make-and-model") &&
attr->value_tag == IPP_TAG_TEXT)
dequote(make_model, attr->values[0].string.text, sizeof(location));
else if (!strcmp(attr->name, "printer-state") &&
attr->value_tag == IPP_TAG_ENUM)
state = (ipp_pstate_t)attr->values[0].integer;
else if (!strcmp(attr->name, "printer-type") &&
attr->value_tag == IPP_TAG_ENUM)
type = (cups_ptype_t)attr->values[0].integer;
attr = attr->next;
}
/*
* See if we have everything needed...
*/
if (uri == NULL)
{
if (attr == NULL)
break;
else
continue;
}
/*
* Send the printer information...
*/
type |= CUPS_PRINTER_REMOTE;
if (!accepting)
type |= CUPS_PRINTER_REJECTING;
snprintf(packet, sizeof(packet),
"%x %x %s \"%s\" \"%s\" \"%s\" lease-duration=%d%s\n",
type, state, uri, location, info, make_model, interval * 2,
job_sheets);
fprintf(stderr, "DEBUG2: %s Sending %s", prefix, packet);
if (sendto(sock, packet, strlen(packet), 0,
(struct sockaddr *)&addr, sizeof(addr)) <= 0)
{
ippDelete(response);
perror("cups-polld");
return (-1);
}
/*
* Throttle the local broadcasts as needed so that we don't
* overwhelm the local server...
*/
count ++;
if (count >= max_count)
{
/*
* Sleep for a second...
*/
count = 0;
sleep(1);
}
if (!attr || restart_polling)
break;
}
ippDelete(response);
}
/*
* Return the number of seconds we used...
*/
return (time(NULL) - seconds);
}
/*
* 'sighup_handler()' - Handle 'hangup' signals to restart polling.
*/
static void
sighup_handler(int sig) /* I - Signal number */
{
(void)sig;
restart_polling = 1;
#if !defined(HAVE_SIGSET) && !defined(HAVE_SIGACTION)
signal(SIGHUP, sighup_handler);
#endif /* !HAVE_SIGSET && !HAVE_SIGACTION */
}
/*
* End of "$Id: cups-polld.c 7198 2008-01-08 00:12:17Z mike $".
*/
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