FreeBSD-5.3/usr.sbin/lpr/lpd/recvjob.c
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1983, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#if 0
#ifndef lint
static char sccsid[] = "@(#)recvjob.c 8.2 (Berkeley) 4/27/95";
#endif /* not lint */
#endif
#include "lp.cdefs.h" /* A cross-platform version of <sys/cdefs.h> */
__FBSDID("$FreeBSD: src/usr.sbin/lpr/lpd/recvjob.c,v 1.31 2003/08/21 03:43:48 gad Exp $");
/*
* Receive printer jobs from the network, queue them and
* start the printer daemon.
*/
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <unistd.h>
#include <signal.h>
#include <fcntl.h>
#include <dirent.h>
#include <errno.h>
#include <syslog.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lp.h"
#include "lp.local.h"
#include "ctlinfo.h"
#include "extern.h"
#include "pathnames.h"
#define ack() (void) write(STDOUT_FILENO, sp, (size_t)1);
/*
* The buffer size to use when reading/writing spool files.
*/
#define SPL_BUFSIZ BUFSIZ
static char dfname[NAME_MAX]; /* data files */
static int minfree; /* keep at least minfree blocks available */
static const char *sp = "";
static char tfname[NAME_MAX]; /* tmp copy of cf before linking */
static int chksize(int _size);
static void frecverr(const char *_msg, ...) __printf0like(1, 2);
static int noresponse(void);
static void rcleanup(int _signo);
static int read_number(const char *_fn);
static int readfile(struct printer *_pp, char *_file, size_t _size);
static int readjob(struct printer *_pp);
void
recvjob(const char *printer)
{
struct stat stb;
int status;
struct printer myprinter, *pp = &myprinter;
/*
* Perform lookup for printer name or abbreviation
*/
init_printer(pp);
status = getprintcap(printer, pp);
switch (status) {
case PCAPERR_OSERR:
frecverr("cannot open printer description file");
break;
case PCAPERR_NOTFOUND:
frecverr("unknown printer %s", printer);
break;
case PCAPERR_TCLOOP:
fatal(pp, "potential reference loop detected in printcap file");
default:
break;
}
(void) close(STDERR_FILENO); /* set up log file */
if (open(pp->log_file, O_WRONLY|O_APPEND, 0664) < 0) {
syslog(LOG_ERR, "%s: %m", pp->log_file);
(void) open(_PATH_DEVNULL, O_WRONLY);
}
if (chdir(pp->spool_dir) < 0)
frecverr("%s: chdir(%s): %s", pp->printer, pp->spool_dir,
strerror(errno));
if (stat(pp->lock_file, &stb) == 0) {
if (stb.st_mode & 010) {
/* queue is disabled */
putchar('\1'); /* return error code */
exit(1);
}
} else if (stat(pp->spool_dir, &stb) < 0)
frecverr("%s: stat(%s): %s", pp->printer, pp->spool_dir,
strerror(errno));
minfree = 2 * read_number("minfree"); /* scale KB to 512 blocks */
signal(SIGTERM, rcleanup);
signal(SIGPIPE, rcleanup);
if (readjob(pp))
printjob(pp);
}
/*
* Read printer jobs sent by lpd and copy them to the spooling directory.
* Return the number of jobs successfully transfered.
*/
static int
readjob(struct printer *pp)
{
register int size;
int cfcnt, dfcnt;
char *cp, *clastp, *errmsg;
char givenid[32], givenhost[MAXHOSTNAMELEN];
ack();
cfcnt = 0;
dfcnt = 0;
for (;;) {
/*
* Read a command to tell us what to do
*/
cp = line;
clastp = line + sizeof(line) - 1;
do {
size = read(STDOUT_FILENO, cp, (size_t)1);
if (size != (ssize_t)1) {
if (size < (ssize_t)0) {
frecverr("%s: lost connection",
pp->printer);
/*NOTREACHED*/
}
return (cfcnt);
}
} while ((*cp++ != '\n') && (cp <= clastp));
if (cp > clastp) {
frecverr("%s: readjob overflow", pp->printer);
/*NOTREACHED*/
}
*--cp = '\0';
cp = line;
switch (*cp++) {
case '\1': /* cleanup because data sent was bad */
rcleanup(0);
continue;
case '\2': /* read cf file */
size = 0;
dfcnt = 0;
while (*cp >= '0' && *cp <= '9')
size = size * 10 + (*cp++ - '0');
if (*cp++ != ' ')
break;
/*
* host name has been authenticated, we use our
* view of the host name since we may be passed
* something different than what gethostbyaddr()
* returns
*/
strlcpy(cp + 6, from_host, sizeof(line)
+ (size_t)(line - cp - 6));
if (strchr(cp, '/')) {
frecverr("readjob: %s: illegal path name", cp);
/*NOTREACHED*/
}
strlcpy(tfname, cp, sizeof(tfname));
tfname[sizeof (tfname) - 1] = '\0';
tfname[0] = 't';
if (!chksize(size)) {
(void) write(STDOUT_FILENO, "\2", (size_t)1);
continue;
}
if (!readfile(pp, tfname, (size_t)size)) {
rcleanup(0);
continue;
}
errmsg = ctl_renametf(pp->printer, tfname);
tfname[0] = '\0';
if (errmsg != NULL) {
frecverr("%s: %s", pp->printer, errmsg);
/*NOTREACHED*/
}
cfcnt++;
continue;
case '\3': /* read df file */
*givenid = '\0';
*givenhost = '\0';
size = 0;
while (*cp >= '0' && *cp <= '9')
size = size * 10 + (*cp++ - '0');
if (*cp++ != ' ')
break;
if (strchr(cp, '/')) {
frecverr("readjob: %s: illegal path name", cp);
/*NOTREACHED*/
}
if (!chksize(size)) {
(void) write(STDOUT_FILENO, "\2", (size_t)1);
continue;
}
strlcpy(dfname, cp, sizeof(dfname));
dfcnt++;
trstat_init(pp, dfname, dfcnt);
(void) readfile(pp, dfname, (size_t)size);
trstat_write(pp, TR_RECVING, (size_t)size, givenid,
from_host, givenhost);
continue;
}
frecverr("protocol screwup: %s", line);
/*NOTREACHED*/
}
}
/*
* Read files send by lpd and copy them to the spooling directory.
*/
static int
readfile(struct printer *pp, char *file, size_t size)
{
register char *cp;
char buf[SPL_BUFSIZ];
size_t amt, i;
int err, fd, j;
fd = open(file, O_CREAT|O_EXCL|O_WRONLY, FILMOD);
if (fd < 0) {
frecverr("%s: readfile: error on open(%s): %s",
pp->printer, file, strerror(errno));
/*NOTREACHED*/
}
ack();
err = 0;
for (i = 0; i < size; i += SPL_BUFSIZ) {
amt = SPL_BUFSIZ;
cp = buf;
if (i + amt > size)
amt = size - i;
do {
j = read(STDOUT_FILENO, cp, amt);
if (j <= 0) {
frecverr("%s: lost connection", pp->printer);
/*NOTREACHED*/
}
amt -= j;
cp += j;
} while (amt > 0);
amt = SPL_BUFSIZ;
if (i + amt > size)
amt = size - i;
if (write(fd, buf, amt) != (ssize_t)amt) {
err++;
break;
}
}
(void) close(fd);
if (err) {
frecverr("%s: write error on close(%s)", pp->printer, file);
/*NOTREACHED*/
}
if (noresponse()) { /* file sent had bad data in it */
if (strchr(file, '/') == NULL)
(void) unlink(file);
return (0);
}
ack();
return (1);
}
static int
noresponse(void)
{
char resp;
if (read(STDOUT_FILENO, &resp, (size_t)1) != 1) {
frecverr("lost connection in noresponse()");
/*NOTREACHED*/
}
if (resp == '\0')
return(0);
return(1);
}
/*
* Check to see if there is enough space on the disk for size bytes.
* 1 == OK, 0 == Not OK.
*/
static int
chksize(int size)
{
int spacefree;
struct statfs sfb;
if (statfs(".", &sfb) < 0) {
syslog(LOG_ERR, "%s: %m", "statfs(\".\")");
return (1);
}
spacefree = sfb.f_bavail * (sfb.f_bsize / 512);
size = (size + 511) / 512;
if (minfree + size > spacefree)
return(0);
return(1);
}
static int
read_number(const char *fn)
{
char lin[80];
register FILE *fp;
if ((fp = fopen(fn, "r")) == NULL)
return (0);
if (fgets(lin, 80, fp) == NULL) {
fclose(fp);
return (0);
}
fclose(fp);
return (atoi(lin));
}
/*
* Remove all the files associated with the current job being transfered.
*/
static void
rcleanup(int signo __unused)
{
if (tfname[0] && strchr(tfname, '/') == NULL)
(void) unlink(tfname);
if (dfname[0] && strchr(dfname, '/') == NULL) {
do {
do
(void) unlink(dfname);
while (dfname[2]-- != 'A');
dfname[2] = 'z';
} while (dfname[0]-- != 'd');
}
dfname[0] = '\0';
}
#include <stdarg.h>
static void
frecverr(const char *msg, ...)
{
va_list ap;
va_start(ap, msg);
syslog(LOG_ERR, "Error receiving job from %s:", from_host);
vsyslog(LOG_ERR, msg, ap);
va_end(ap);
/*
* rcleanup is not called until AFTER logging the error message,
* because rcleanup will zap some variables which may have been
* supplied as parameters for that msg...
*/
rcleanup(0);
/*
* Add a minimal delay before returning the final error code to
* the sending host. This just in case that machine responds
* this error by INSTANTLY retrying (and instantly re-failing...).
* It would be stupid of the sending host to do that, but if there
* was a broken implementation which did it, the result might be
* obscure performance problems and a flood of syslog messages on
* the receiving host.
*/
sleep(2); /* a paranoid throttling measure */
putchar('\1'); /* return error code */
exit(1);
}