NetBSD-5.0.2/usr.sbin/lpr/lpd/recvjob.c
/* $NetBSD: recvjob.c,v 1.21 2008/07/21 13:36:58 lukem Exp $ */
/*
* 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. 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.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1983, 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)recvjob.c 8.2 (Berkeley) 4/27/95";
#else
__RCSID("$NetBSD: recvjob.c,v 1.21 2008/07/21 13:36:58 lukem Exp $");
#endif
#endif /* not lint */
/*
* 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 <syslog.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lp.h"
#include "lp.local.h"
#include "extern.h"
#include "pathnames.h"
#define ack() (void)write(STDOUT_FILENO, sp, 1);
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);
static void frecverr(const char *, ...)
__attribute__((__format__(__printf__, 1, 2)));
static int noresponse(void);
static void rcleanup(int);
static int read_number(const char *);
static int readfile(char *, int);
static int readjob(void);
void
recvjob(void)
{
struct stat stb;
int fd;
getprintcap(printer);
/* Set up the log file. */
if ((fd = open(LF, O_WRONLY|O_APPEND, 0664)) < 0) {
syslog(LOG_ERR, "%s: %m", LF);
fd = open(_PATH_DEVNULL, O_WRONLY);
}
if (fd > 0) {
(void) dup2(fd, STDERR_FILENO);
(void) close(fd);
} else
(void) close(STDERR_FILENO);
if (chdir(SD) < 0)
frecverr("%s: %s: %m", printer, SD);
if (stat(LO, &stb) == 0) {
if (stb.st_mode & 010) {
/* queue is disabled */
putchar('\1'); /* return error code */
exit(1);
}
} else if (stat(SD, &stb) < 0)
frecverr("%s: %s: %m", printer, SD);
minfree = 2 * read_number("minfree"); /* scale KB to 512 blocks */
signal(SIGTERM, rcleanup);
signal(SIGPIPE, rcleanup);
if (readjob())
printjob();
}
/*
* Read printer jobs sent by lpd and copy them to the spooling directory.
* Return the number of jobs successfully transfered.
*/
static int
readjob(void)
{
int size, nfiles;
char *cp;
ack();
nfiles = 0;
for (;;) {
/*
* Read a command to tell us what to do
*/
cp = line;
do {
if ((size = read(STDOUT_FILENO, cp, 1)) != 1) {
if (size < 0)
frecverr("%s: Lost connection",
printer);
return(nfiles);
}
} while (*cp++ != '\n' && (cp - line + 1) < sizeof(line));
if (cp - line + 1 >= sizeof(line))
frecverr("readjob overflow");
*--cp = '\0';
cp = line;
switch (*cp++) {
case '\1': /* cleanup because data sent was bad */
rcleanup(0);
continue;
case '\2': /* read cf file */
size = 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
*/
(void)strlcpy(cp + 6, from,
sizeof(line) + line - cp - 6);
if (strchr(cp, '/'))
frecverr("readjob: %s: illegal path name", cp);
(void)strlcpy(tfname, cp, sizeof(tfname));
tfname[0] = 't';
if (!chksize(size)) {
(void)write(STDOUT_FILENO, "\2", 1);
continue;
}
if (!readfile(tfname, size)) {
rcleanup(0);
continue;
}
if (link(tfname, cp) < 0)
frecverr("%s: %m", tfname);
(void)unlink(tfname);
tfname[0] = '\0';
nfiles++;
continue;
case '\3': /* read df file */
size = 0;
while (*cp >= '0' && *cp <= '9')
size = size * 10 + (*cp++ - '0');
if (*cp++ != ' ')
break;
if (!chksize(size)) {
(void)write(STDOUT_FILENO, "\2", 1);
continue;
}
if (strchr(cp, '/'))
frecverr("readjob: %s: illegal path name", cp);
(void)strlcpy(dfname, cp, sizeof(dfname));
(void)readfile(dfname, size);
continue;
}
frecverr("protocol screwup: %s", line);
}
}
/*
* Read files send by lpd and copy them to the spooling directory.
*/
static int
readfile(char *file, int size)
{
char *cp;
char buf[BUFSIZ];
int i, j, amt;
int fd, err;
fd = open(file, O_CREAT|O_EXCL|O_WRONLY, FILMOD);
if (fd < 0)
frecverr("readfile: %s: illegal path name: %m", file);
ack();
err = 0;
for (i = 0; i < size; i += BUFSIZ) {
amt = BUFSIZ;
cp = buf;
if (i + amt > size)
amt = size - i;
do {
j = read(STDOUT_FILENO, cp, amt);
if (j <= 0)
frecverr("Lost connection");
amt -= j;
cp += j;
} while (amt > 0);
amt = BUFSIZ;
if (i + amt > size)
amt = size - i;
if (write(fd, buf, amt) != amt) {
err++;
break;
}
}
(void)close(fd);
if (err)
frecverr("%s: write error", file);
if (noresponse()) { /* file sent had bad data in it */
(void)unlink(file);
return(0);
}
ack();
return(1);
}
static int
noresponse(void)
{
char resp;
if (read(STDOUT_FILENO, &resp, 1) != 1)
frecverr("Lost connection");
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 statvfs sfb;
if (statvfs(".", &sfb) < 0) {
syslog(LOG_ERR, "%s: %m", "statfs(\".\")");
return (1);
}
spacefree = sfb.f_bavail * (sfb.f_frsize / 512);
size = (size + 511) / 512;
if (minfree + size > spacefree)
return(0);
return(1);
}
static int
read_number(const char *fn)
{
char lin[80];
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)
{
if (tfname[0])
(void)unlink(tfname);
if (dfname[0])
do {
do {
if (strchr(dfname, '/') == 0)
(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, ...)
{
extern char fromb[];
va_list ap;
va_start(ap, msg);
rcleanup(0);
syslog(LOG_ERR, "%s", fromb);
vsyslog(LOG_ERR, msg, ap);
va_end(ap);
putchar('\1'); /* return error code */
exit(1);
}