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lpd.c
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/*
* Line Printer Daemon backend for CUPS.
*
* Copyright © 2007-2019 by Apple Inc.
* Copyright © 1997-2007 by Easy Software Products, all rights reserved.
*
* Licensed under Apache License v2.0. See the file "LICENSE" for more
* information.
*/
/*
* Include necessary headers.
*/
#include <cups/http-private.h>
#include "backend-private.h"
#include <stdarg.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#ifdef _WIN32
# include <winsock.h>
#else
# include <sys/socket.h>
# include <netinet/in.h>
# include <arpa/inet.h>
# include <netdb.h>
#endif /* _WIN32 */
#ifdef __APPLE__
# include <CoreFoundation/CFNumber.h>
# include <CoreFoundation/CFPreferences.h>
#endif /* __APPLE__ */
/*
* Globals...
*/
static char tmpfilename[1024] = ""; /* Temporary spool file name */
static int abort_job = 0; /* Non-zero if we get SIGTERM */
/*
* Print mode...
*/
#define MODE_STANDARD 0 /* Queue a copy */
#define MODE_STREAM 1 /* Stream a copy */
/*
* The order for control and data files in LPD requests...
*/
#define ORDER_CONTROL_DATA 0 /* Control file first, then data */
#define ORDER_DATA_CONTROL 1 /* Data file first, then control */
/*
* What to reserve...
*/
#define RESERVE_NONE 0 /* Don't reserve a priviledged port */
#define RESERVE_RFC1179 1 /* Reserve port 721-731 */
#define RESERVE_ANY 2 /* Reserve port 1-1023 */
/*
* Local functions...
*/
static int cups_rresvport(int *port, int family);
static int lpd_command(int lpd_fd, char *format, ...)
# ifdef __GNUC__
__attribute__ ((__format__ (__printf__, 2, 3)))
# endif /* __GNUC__ */
;
static int lpd_queue(const char *hostname, http_addrlist_t *addrlist, const char *printer, int print_fd, int snmp_fd, int mode, const char *user, const char *title, int copies, int banner, int format, int order, int reserve, int manual_copies, int timeout, int contimeout, const char *orighost) _CUPS_NONNULL((1,2,3,7,8,17));
static ssize_t lpd_write(int lpd_fd, char *buffer, size_t length);
static void sigterm_handler(int sig);
/*
* '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 arguments (6 or 7) */
char *argv[]) /* I - Command-line arguments */
{
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) */
*options, /* Pointer to options */
*name, /* Name of option */
*value, /* Value of option */
sep, /* Separator character */
*filename, /* File to print */
title[256]; /* Title string */
int port; /* Port number */
http_addrlist_t *addrlist; /* List of addresses for printer */
int snmp_enabled = 1; /* Is SNMP enabled? */
int snmp_fd; /* SNMP socket */
int fd; /* Print file */
int status; /* Status of LPD job */
int mode; /* Print mode */
int banner; /* Print banner page? */
int format; /* Print format */
int order; /* Order of control/data files */
int reserve; /* Reserve priviledged port? */
int sanitize_title; /* Sanitize title string? */
int manual_copies, /* Do manual copies? */
timeout, /* Timeout */
contimeout, /* Connection timeout */
copies; /* Number of copies */
ssize_t bytes = 0; /* Initial bytes read */
char buffer[16384]; /* Initial print buffer */
#if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
struct sigaction action; /* Actions for POSIX signals */
#endif /* HAVE_SIGACTION && !HAVE_SIGSET */
int num_jobopts; /* Number of job options */
cups_option_t *jobopts = NULL; /* Job options */
/*
* 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)
{
printf("network lpd \"Unknown\" \"%s\"\n",
_cupsLangString(cupsLangDefault(), _("LPD/LPR Host or Printer")));
return (CUPS_BACKEND_OK);
}
else if (argc < 6 || argc > 7)
{
_cupsLangPrintf(stderr,
_("Usage: %s job-id user title copies options [file]"),
argv[0]);
return (CUPS_BACKEND_FAILED);
}
num_jobopts = cupsParseOptions(argv[5], 0, &jobopts);
/*
* Extract the hostname and printer name from the URI...
*/
while ((device_uri = cupsBackendDeviceURI(argv)) == NULL)
{
_cupsLangPrintFilter(stderr, "INFO", _("Unable to locate printer."));
sleep(10);
if (getenv("CLASS") != NULL)
return (CUPS_BACKEND_FAILED);
}
httpSeparateURI(HTTP_URI_CODING_ALL, device_uri, scheme, sizeof(scheme),
username, sizeof(username), hostname, sizeof(hostname), &port,
resource, sizeof(resource));
if (!port)
port = 515; /* Default to port 515 */
if (!username[0])
{
/*
* If no username is in the device URI, then use the print job user...
*/
strlcpy(username, argv[2], sizeof(username));
}
/*
* See if there are any options...
*/
mode = MODE_STANDARD;
banner = 0;
format = 'l';
order = ORDER_CONTROL_DATA;
reserve = RESERVE_ANY;
manual_copies = 1;
timeout = 300;
contimeout = 7 * 24 * 60 * 60;
#ifdef __APPLE__
/*
* We want to pass UTF-8 characters by default, not re-map them (3071945)
*/
sanitize_title = 0;
#else
/*
* Otherwise we want to re-map UTF-8 to "safe" characters by default...
*/
sanitize_title = 1;
#endif /* __APPLE__ */
if ((options = strchr(resource, '?')) != NULL)
{
/*
* Yup, terminate the device name string and move to the first
* character of the options...
*/
*options++ = '\0';
/*
* Parse options...
*/
while (*options)
{
/*
* Get the name...
*/
name = options;
while (*options && *options != '=' && *options != '+' && *options != '&')
options ++;
if ((sep = *options) != '\0')
*options++ = '\0';
if (sep == '=')
{
/*
* Get the value...
*/
value = options;
while (*options && *options != '+' && *options != '&')
options ++;
if (*options)
*options++ = '\0';
}
else
value = (char *)"";
/*
* Process the option...
*/
if (!_cups_strcasecmp(name, "banner"))
{
/*
* Set the banner...
*/
banner = !value[0] || !_cups_strcasecmp(value, "on") ||
!_cups_strcasecmp(value, "yes") || !_cups_strcasecmp(value, "true");
}
else if (!_cups_strcasecmp(name, "format") && value[0])
{
/*
* Set output format...
*/
if (strchr("cdfglnoprtv", value[0]))
format = value[0];
else
_cupsLangPrintFilter(stderr, "ERROR",
_("Unknown format character: \"%c\"."),
value[0]);
}
else if (!_cups_strcasecmp(name, "mode") && value[0])
{
/*
* Set control/data order...
*/
if (!_cups_strcasecmp(value, "standard"))
mode = MODE_STANDARD;
else if (!_cups_strcasecmp(value, "stream"))
mode = MODE_STREAM;
else
_cupsLangPrintFilter(stderr, "ERROR",
_("Unknown print mode: \"%s\"."), value);
}
else if (!_cups_strcasecmp(name, "order") && value[0])
{
/*
* Set control/data order...
*/
if (!_cups_strcasecmp(value, "control,data"))
order = ORDER_CONTROL_DATA;
else if (!_cups_strcasecmp(value, "data,control"))
order = ORDER_DATA_CONTROL;
else
_cupsLangPrintFilter(stderr, "ERROR",
_("Unknown file order: \"%s\"."), value);
}
else if (!_cups_strcasecmp(name, "reserve"))
{
/*
* Set port reservation mode...
*/
if (!value[0] || !_cups_strcasecmp(value, "on") ||
!_cups_strcasecmp(value, "yes") ||
!_cups_strcasecmp(value, "true") ||
!_cups_strcasecmp(value, "rfc1179"))
reserve = RESERVE_RFC1179;
else if (!_cups_strcasecmp(value, "any"))
reserve = RESERVE_ANY;
else
reserve = RESERVE_NONE;
}
else if (!_cups_strcasecmp(name, "manual_copies"))
{
/*
* Set manual copies...
*/
manual_copies = !value[0] || !_cups_strcasecmp(value, "on") ||
!_cups_strcasecmp(value, "yes") ||
!_cups_strcasecmp(value, "true");
}
else if (!_cups_strcasecmp(name, "sanitize_title"))
{
/*
* Set sanitize title...
*/
sanitize_title = !value[0] || !_cups_strcasecmp(value, "on") ||
!_cups_strcasecmp(value, "yes") ||
!_cups_strcasecmp(value, "true");
}
else if (!_cups_strcasecmp(name, "snmp"))
{
/*
* Enable/disable SNMP stuff...
*/
snmp_enabled = !value[0] || !_cups_strcasecmp(value, "on") ||
!_cups_strcasecmp(value, "yes") ||
!_cups_strcasecmp(value, "true");
}
else if (!_cups_strcasecmp(name, "timeout"))
{
/*
* Set the timeout...
*/
if (atoi(value) > 0)
timeout = atoi(value);
}
else if (!_cups_strcasecmp(name, "contimeout"))
{
/*
* Set the connection timeout...
*/
if (atoi(value) > 0)
contimeout = atoi(value);
}
}
}
if (mode == MODE_STREAM)
order = ORDER_CONTROL_DATA;
/*
* Find the printer...
*/
addrlist = backendLookup(hostname, port, NULL);
/*
* See if the printer supports SNMP...
*/
if (snmp_enabled)
snmp_fd = _cupsSNMPOpen(addrlist->addr.addr.sa_family);
else
snmp_fd = -1;
/*
* Wait for data from the filter...
*/
if (argc == 6)
{
if (!backendWaitLoop(snmp_fd, &(addrlist->addr), 0, backendNetworkSideCB))
return (CUPS_BACKEND_OK);
else if (mode == MODE_STANDARD &&
(bytes = read(0, buffer, sizeof(buffer))) <= 0)
return (CUPS_BACKEND_OK);
}
/*
* 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 && mode == MODE_STANDARD)
{
/*
* Copy stdin to a temporary file...
*/
if ((fd = cupsTempFd(tmpfilename, sizeof(tmpfilename))) < 0)
{
perror("DEBUG: Unable to create temporary file");
return (CUPS_BACKEND_FAILED);
}
_cupsLangPrintFilter(stderr, "INFO", _("Copying print data."));
if (bytes > 0)
write(fd, buffer, (size_t)bytes);
backendRunLoop(-1, fd, snmp_fd, &(addrlist->addr), 0, 0,
backendNetworkSideCB);
}
else if (argc == 6)
{
/*
* Stream from stdin...
*/
filename = NULL;
fd = 0;
}
else
{
filename = argv[6];
fd = open(filename, O_RDONLY);
if (fd == -1)
{
_cupsLangPrintError("ERROR", _("Unable to open print file"));
return (CUPS_BACKEND_FAILED);
}
}
/*
* Sanitize the document title...
*/
strlcpy(title, argv[3], sizeof(title));
if (sanitize_title)
{
/*
* Sanitize the title string so that we don't cause problems on
* the remote end...
*/
char *ptr;
for (ptr = title; *ptr; ptr ++)
if (!isalnum(*ptr & 255) && !isspace(*ptr & 255))
*ptr = '_';
}
/*
* Queue the job...
*/
if (argc > 6)
{
if (manual_copies)
{
manual_copies = atoi(argv[4]);
copies = 1;
}
else
{
manual_copies = 1;
copies = atoi(argv[4]);
}
status = lpd_queue(hostname, addrlist, resource + 1, fd, snmp_fd, mode,
username, title, copies, banner, format, order, reserve,
manual_copies, timeout, contimeout,
cupsGetOption("job-originating-host-name", num_jobopts,
jobopts));
if (!status)
fprintf(stderr, "PAGE: 1 %d\n", atoi(argv[4]));
}
else
status = lpd_queue(hostname, addrlist, resource + 1, fd, snmp_fd, mode,
username, title, 1, banner, format, order, reserve, 1,
timeout, contimeout,
cupsGetOption("job-originating-host-name", num_jobopts,
jobopts));
/*
* Remove the temporary file if necessary...
*/
if (tmpfilename[0])
unlink(tmpfilename);
if (fd)
close(fd);
if (snmp_fd >= 0)
_cupsSNMPClose(snmp_fd);
/*
* Return the queue status...
*/
return (status);
}
/*
* 'cups_rresvport()' - A simple implementation of rresvport_af().
*/
static int /* O - Socket or -1 on error */
cups_rresvport(int *port, /* IO - Port number to bind to */
int family) /* I - Address family */
{
http_addr_t addr; /* Socket address */
int fd; /* Socket file descriptor */
/*
* Try to create an IPv4 socket...
*/
if ((fd = socket(family, SOCK_STREAM, 0)) < 0)
return (-1);
/*
* Initialize the address buffer...
*/
memset(&addr, 0, sizeof(addr));
addr.addr.sa_family = (sa_family_t)family;
/*
* Try to bind the socket to a reserved port...
*/
while (*port > 511)
{
/*
* Set the port number...
*/
_httpAddrSetPort(&addr, *port);
/*
* Try binding the port to the socket; return if all is OK...
*/
if (!bind(fd, (struct sockaddr *)&addr, (socklen_t)httpAddrLength(&addr)))
return (fd);
/*
* Stop if we have any error other than "address already in use"...
*/
if (errno != EADDRINUSE)
{
httpAddrClose(NULL, fd);
return (-1);
}
/*
* Try the next port...
*/
(*port)--;
}
/*
* Wasn't able to bind to a reserved port, so close the socket and return
* -1...
*/
#ifdef _WIN32
closesocket(fd);
#else
close(fd);
#endif /* _WIN32 */
return (-1);
}
/*
* 'lpd_command()' - Send an LPR command sequence and wait for a reply.
*/
static int /* O - Status of command */
lpd_command(int fd, /* I - Socket connection to LPD host */
char *format, /* I - printf()-style format string */
...) /* I - Additional args as necessary */
{
va_list ap; /* Argument pointer */
char buf[1024]; /* Output buffer */
ssize_t bytes; /* Number of bytes to output */
char status; /* Status from command */
/*
* Don't try to send commands if the job has been canceled...
*/
if (abort_job)
return (-1);
/*
* Format the string...
*/
va_start(ap, format);
bytes = vsnprintf(buf, sizeof(buf), format, ap);
va_end(ap);
fprintf(stderr, "DEBUG: lpd_command %2.2x %s", buf[0], buf + 1);
/*
* Send the command...
*/
fprintf(stderr, "DEBUG: Sending command string (" CUPS_LLFMT " bytes)...\n", CUPS_LLCAST bytes);
if (lpd_write(fd, buf, (size_t)bytes) < bytes)
{
perror("DEBUG: Unable to send LPD command");
return (-1);
}
/*
* Read back the status from the command and return it...
*/
fputs("DEBUG: Reading command status...\n", stderr);
if (recv(fd, &status, 1, 0) < 1)
{
_cupsLangPrintFilter(stderr, "WARNING", _("The printer did not respond."));
status = (char)errno;
}
fprintf(stderr, "DEBUG: lpd_command returning %d\n", status);
return (status);
}
/*
* 'lpd_queue()' - Queue a file using the Line Printer Daemon protocol.
*/
static int /* O - Zero on success, non-zero on failure */
lpd_queue(const char *hostname, /* I - Host to connect to */
http_addrlist_t *addrlist, /* I - List of host addresses */
const char *printer, /* I - Printer/queue name */
int print_fd, /* I - File to print */
int snmp_fd, /* I - SNMP socket */
int mode, /* I - Print mode */
const char *user, /* I - Requesting user */
const char *title, /* I - Job title */
int copies, /* I - Number of copies */
int banner, /* I - Print LPD banner? */
int format, /* I - Format specifier */
int order, /* I - Order of data/control files */
int reserve, /* I - Reserve ports? */
int manual_copies,/* I - Do copies by hand... */
int timeout, /* I - Timeout... */
int contimeout, /* I - Connection timeout */
const char *orighost) /* I - job-originating-host-name */
{
char localhost[255]; /* Local host name */
int error; /* Error number */
struct stat filestats; /* File statistics */
int lport; /* LPD connection local port */
int fd; /* LPD socket */
char control[10240], /* LPD control 'file' */
*cptr; /* Pointer into control file string */
char status; /* Status byte from command */
int delay; /* Delay for retries... */
char addrname[256]; /* Address name */
http_addrlist_t *addr; /* Socket address */
int have_supplies; /* Printer supports supply levels? */
int copy; /* Copies written */
time_t start_time; /* Time of first connect */
ssize_t nbytes; /* Number of bytes written */
off_t tbytes; /* Total bytes written */
char buffer[32768]; /* Output buffer */
#ifdef _WIN32
DWORD tv; /* Timeout in milliseconds */
#else
struct timeval tv; /* Timeout in secs and usecs */
#endif /* _WIN32 */
/*
* Remember when we started trying to connect to the printer...
*/
start_time = time(NULL);
/*
* Loop forever trying to print the file...
*/
while (!abort_job)
{
/*
* First try to reserve a port for this connection...
*/
fprintf(stderr, "DEBUG: Connecting to %s:%d for printer %s\n", hostname,
httpAddrPort(&(addrlist->addr)), printer);
_cupsLangPrintFilter(stderr, "INFO", _("Connecting to printer."));
for (lport = reserve == RESERVE_RFC1179 ? 732 : 1024, addr = addrlist,
delay = 5;;
addr = addr->next)
{
/*
* Stop if this job has been canceled...
*/
if (abort_job)
return (CUPS_BACKEND_FAILED);
/*
* Choose the next priviledged port...
*/
if (!addr)
addr = addrlist;
lport --;
if (lport < 721 && reserve == RESERVE_RFC1179)
lport = 731;
else if (lport < 1)
lport = 1023;
#ifdef HAVE_GETEUID
if (geteuid() || !reserve)
#else
if (getuid() || !reserve)
#endif /* HAVE_GETEUID */
{
/*
* Just create a regular socket...
*/
if ((fd = socket(addr->addr.addr.sa_family, SOCK_STREAM, 0)) < 0)
{
perror("DEBUG: Unable to create socket");
sleep(1);
continue;
}
lport = 0;
}
else
{
/*
* We're running as root and want to comply with RFC 1179. Reserve a
* priviledged lport between 721 and 731...
*/
if ((fd = cups_rresvport(&lport, addr->addr.addr.sa_family)) < 0)
{
perror("DEBUG: Unable to reserve port");
sleep(1);
continue;
}
}
/*
* Connect to the printer or server...
*/
if (abort_job)
{
close(fd);
return (CUPS_BACKEND_FAILED);
}
if (!connect(fd, &(addr->addr.addr), (socklen_t)httpAddrLength(&(addr->addr))))
break;
error = errno;
close(fd);
if (addr->next)
continue;
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);
return (CUPS_BACKEND_FAILED);
}
fprintf(stderr, "DEBUG: Connection error: %s\n", strerror(error));
if (errno == ECONNREFUSED || errno == EHOSTDOWN || errno == EHOSTUNREACH || errno == ETIMEDOUT || errno == ENOTCONN)
{
if (contimeout && (time(NULL) - start_time) > contimeout)
{
_cupsLangPrintFilter(stderr, "ERROR",
_("The printer is not responding."));
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 :
default :
_cupsLangPrintFilter(stderr, "WARNING",
_("The printer is unreachable at "
"this time."));
break;
case ECONNREFUSED :
_cupsLangPrintFilter(stderr, "WARNING",
_("The printer is in use."));
break;
}
sleep((unsigned)delay);
if (delay < 30)
delay += 5;
}
else if (error == EADDRINUSE)
{
/*
* Try on another port...
*/
sleep(1);
}
else
{
_cupsLangPrintFilter(stderr, "ERROR",
_("The printer is not responding."));
sleep(30);
}
}
/*
* Set the timeout...
*/
#ifdef _WIN32
tv = (DWORD)(timeout * 1000);
setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, (char *)&tv, sizeof(tv));
setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, (char *)&tv, sizeof(tv));
#else
tv.tv_sec = timeout;
tv.tv_usec = 0;
setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
#endif /* _WIN32 */
fputs("STATE: -connecting-to-device\n", stderr);
_cupsLangPrintFilter(stderr, "INFO", _("Connected to printer."));
fprintf(stderr, "DEBUG: Connected to %s:%d (local port %d)...\n",
httpAddrString(&(addr->addr), addrname, sizeof(addrname)),
httpAddrPort(&(addr->addr)), lport);
/*
* See if the printer supports SNMP...
*/
if (snmp_fd >= 0)
have_supplies = !backendSNMPSupplies(snmp_fd, &(addrlist->addr), NULL,
NULL);
else
have_supplies = 0;
/*
* Check for side-channel requests...
*/
backendCheckSideChannel(snmp_fd, &(addrlist->addr));
/*
* Next, open the print file and figure out its size...
*/
if (print_fd)
{
/*
* Use the size from the print file...
*/
if (fstat(print_fd, &filestats))
{
close(fd);
perror("DEBUG: unable to stat print file");
return (CUPS_BACKEND_FAILED);
}
filestats.st_size *= manual_copies;
}
else
{
/*
* Use a "very large value" for the size so that the printer will
* keep printing until we close the connection...
*/
#ifdef _LARGEFILE_SOURCE
filestats.st_size = (size_t)(999999999999.0);
#else
filestats.st_size = 2147483647;
#endif /* _LARGEFILE_SOURCE */
}
/*
* Send a job header to the printer, specifying no banner page and
* literal output...
*/
if (lpd_command(fd, "\002%s\n",
printer)) /* Receive print job(s) */
{
close(fd);
return (CUPS_BACKEND_FAILED);
}