4.4BSD/usr/src/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 char copyright[] =
"@(#) Copyright (c) 1983, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)recvjob.c 8.1 (Berkeley) 6/6/93";
#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(1, sp, 1);
static char dfname[40]; /* data files */
static int minfree; /* keep at least minfree blocks available */
static char *sp = "";
static char tfname[40]; /* tmp copy of cf before linking */
static int chksize __P((int));
static void frecverr __P((const char *, ...));
static int noresponse __P((void));
static void rcleanup __P((int));
static int read_number __P((char *));
static int readfile __P((char *, int));
static int readjob __P((void));
void
recvjob()
{
struct stat stb;
int status;
/*
* Perform lookup for printer name or abbreviation
*/
if ((status = cgetent(&bp, printcapdb, printer)) == -2)
frecverr("cannot open printer description file");
else if (status == -1)
frecverr("unknown printer %s", printer);
else if (status == -3)
fatal("potential reference loop detected in printcap file");
if (cgetstr(bp, "lf", &LF) == -1)
LF = _PATH_CONSOLE;
if (cgetstr(bp, "sd", &SD) == -1)
SD = _PATH_DEFSPOOL;
if (cgetstr(bp, "lo", &LO) == -1)
LO = DEFLOCK;
(void) close(2); /* set up log file */
if (open(LF, O_WRONLY|O_APPEND, 0664) < 0) {
syslog(LOG_ERR, "%s: %m", LF);
(void) open(_PATH_DEVNULL, O_WRONLY);
}
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()
{
register int size, nfiles;
register char *cp;
ack();
nfiles = 0;
for (;;) {
/*
* Read a command to tell us what to do
*/
cp = line;
do {
if ((size = read(1, cp, 1)) != 1) {
if (size < 0)
frecverr("%s: Lost connection",printer);
return(nfiles);
}
} while (*cp++ != '\n');
*--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
*/
strcpy(cp + 6, from);
strcpy(tfname, cp);
tfname[0] = 't';
if (!chksize(size)) {
(void) write(1, "\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(1, "\2", 1);
continue;
}
(void) strcpy(dfname, cp);
if (index(dfname, '/'))
frecverr("readjob: %s: illegal path name",
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(file, size)
char *file;
int size;
{
register char *cp;
char buf[BUFSIZ];
register 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(1, 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()
{
char resp;
if (read(1, &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(size)
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(fn)
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(signo)
int signo;
{
if (tfname[0])
(void) unlink(tfname);
if (dfname[0])
do {
do
(void) unlink(dfname);
while (dfname[2]-- != 'A');
dfname[2] = 'z';
} while (dfname[0]-- != 'd');
dfname[0] = '\0';
}
#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif
static void
#if __STDC__
frecverr(const char *msg, ...)
#else
frecverr(msg, va_alist)
char *msg;
va_dcl
#endif
{
extern char *fromb;
va_list ap;
#if __STDC__
va_start(ap, msg);
#else
va_start(ap);
#endif
rcleanup(0);
syslog(LOG_ERR, "%s", fromb);
vsyslog(LOG_ERR, msg, ap);
va_end(ap);
putchar('\1'); /* return error code */
exit(1);
}