0de95e161e
when reading/writing spool files. I intend to do a more elaborate version, but I want to get this much in before 4.9-release. As written, this results in no change to the object code. Submitted by: John-Mark Gurney Reviewed by: /sbin/md5 MFC after: 4 days
410 lines
10 KiB
C
410 lines
10 KiB
C
/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1983, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)recvjob.c 8.2 (Berkeley) 4/27/95";
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#endif /* not lint */
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#endif
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#include "lp.cdefs.h" /* A cross-platform version of <sys/cdefs.h> */
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__FBSDID("$FreeBSD$");
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/*
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* Receive printer jobs from the network, queue them and
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* start the printer daemon.
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*/
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#include <sys/param.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <errno.h>
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#include <syslog.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "lp.h"
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#include "lp.local.h"
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#include "ctlinfo.h"
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#include "extern.h"
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#include "pathnames.h"
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#define ack() (void) write(STDOUT_FILENO, sp, (size_t)1);
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/*
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* The buffer size to use when reading/writing spool files.
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*/
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#define SPL_BUFSIZ BUFSIZ
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static char dfname[NAME_MAX]; /* data files */
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static int minfree; /* keep at least minfree blocks available */
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static const char *sp = "";
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static char tfname[NAME_MAX]; /* tmp copy of cf before linking */
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static int chksize(int _size);
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static void frecverr(const char *_msg, ...) __printf0like(1, 2);
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static int noresponse(void);
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static void rcleanup(int _signo);
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static int read_number(const char *_fn);
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static int readfile(struct printer *_pp, char *_file, size_t _size);
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static int readjob(struct printer *_pp);
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void
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recvjob(const char *printer)
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{
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struct stat stb;
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int status;
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struct printer myprinter, *pp = &myprinter;
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/*
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* Perform lookup for printer name or abbreviation
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*/
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init_printer(pp);
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status = getprintcap(printer, pp);
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switch (status) {
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case PCAPERR_OSERR:
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frecverr("cannot open printer description file");
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break;
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case PCAPERR_NOTFOUND:
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frecverr("unknown printer %s", printer);
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break;
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case PCAPERR_TCLOOP:
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fatal(pp, "potential reference loop detected in printcap file");
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default:
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break;
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}
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(void) close(STDERR_FILENO); /* set up log file */
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if (open(pp->log_file, O_WRONLY|O_APPEND, 0664) < 0) {
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syslog(LOG_ERR, "%s: %m", pp->log_file);
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(void) open(_PATH_DEVNULL, O_WRONLY);
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}
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if (chdir(pp->spool_dir) < 0)
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frecverr("%s: chdir(%s): %s", pp->printer, pp->spool_dir,
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strerror(errno));
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if (stat(pp->lock_file, &stb) == 0) {
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if (stb.st_mode & 010) {
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/* queue is disabled */
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putchar('\1'); /* return error code */
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exit(1);
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}
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} else if (stat(pp->spool_dir, &stb) < 0)
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frecverr("%s: stat(%s): %s", pp->printer, pp->spool_dir,
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strerror(errno));
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minfree = 2 * read_number("minfree"); /* scale KB to 512 blocks */
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signal(SIGTERM, rcleanup);
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signal(SIGPIPE, rcleanup);
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if (readjob(pp))
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printjob(pp);
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}
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/*
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* Read printer jobs sent by lpd and copy them to the spooling directory.
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* Return the number of jobs successfully transfered.
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*/
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static int
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readjob(struct printer *pp)
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{
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register int size;
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int cfcnt, dfcnt;
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char *cp, *clastp, *errmsg;
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char givenid[32], givenhost[MAXHOSTNAMELEN];
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ack();
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cfcnt = 0;
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dfcnt = 0;
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for (;;) {
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/*
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* Read a command to tell us what to do
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*/
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cp = line;
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clastp = line + sizeof(line) - 1;
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do {
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size = read(STDOUT_FILENO, cp, (size_t)1);
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if (size != (ssize_t)1) {
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if (size < (ssize_t)0) {
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frecverr("%s: lost connection",
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pp->printer);
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/*NOTREACHED*/
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}
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return (cfcnt);
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}
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} while ((*cp++ != '\n') && (cp <= clastp));
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if (cp > clastp) {
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frecverr("%s: readjob overflow", pp->printer);
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/*NOTREACHED*/
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}
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*--cp = '\0';
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cp = line;
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switch (*cp++) {
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case '\1': /* cleanup because data sent was bad */
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rcleanup(0);
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continue;
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case '\2': /* read cf file */
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size = 0;
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dfcnt = 0;
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while (*cp >= '0' && *cp <= '9')
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size = size * 10 + (*cp++ - '0');
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if (*cp++ != ' ')
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break;
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/*
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* host name has been authenticated, we use our
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* view of the host name since we may be passed
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* something different than what gethostbyaddr()
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* returns
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*/
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strlcpy(cp + 6, from_host, sizeof(line)
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+ (size_t)(line - cp - 6));
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if (strchr(cp, '/')) {
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frecverr("readjob: %s: illegal path name", cp);
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/*NOTREACHED*/
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}
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strlcpy(tfname, cp, sizeof(tfname));
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tfname[sizeof (tfname) - 1] = '\0';
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tfname[0] = 't';
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if (!chksize(size)) {
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(void) write(STDOUT_FILENO, "\2", (size_t)1);
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continue;
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}
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if (!readfile(pp, tfname, (size_t)size)) {
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rcleanup(0);
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continue;
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}
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errmsg = ctl_renametf(pp->printer, tfname);
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tfname[0] = '\0';
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if (errmsg != NULL) {
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frecverr("%s: %s", pp->printer, errmsg);
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/*NOTREACHED*/
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}
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cfcnt++;
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continue;
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case '\3': /* read df file */
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*givenid = '\0';
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*givenhost = '\0';
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size = 0;
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while (*cp >= '0' && *cp <= '9')
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size = size * 10 + (*cp++ - '0');
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if (*cp++ != ' ')
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break;
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if (strchr(cp, '/')) {
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frecverr("readjob: %s: illegal path name", cp);
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/*NOTREACHED*/
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}
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if (!chksize(size)) {
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(void) write(STDOUT_FILENO, "\2", (size_t)1);
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continue;
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}
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strlcpy(dfname, cp, sizeof(dfname));
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dfcnt++;
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trstat_init(pp, dfname, dfcnt);
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(void) readfile(pp, dfname, (size_t)size);
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trstat_write(pp, TR_RECVING, (size_t)size, givenid,
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from_host, givenhost);
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continue;
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}
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frecverr("protocol screwup: %s", line);
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/*NOTREACHED*/
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}
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}
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/*
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* Read files send by lpd and copy them to the spooling directory.
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*/
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static int
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readfile(struct printer *pp, char *file, size_t size)
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{
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register char *cp;
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char buf[SPL_BUFSIZ];
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size_t amt, i;
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int err, fd, j;
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fd = open(file, O_CREAT|O_EXCL|O_WRONLY, FILMOD);
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if (fd < 0) {
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frecverr("%s: readfile: error on open(%s): %s",
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pp->printer, file, strerror(errno));
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/*NOTREACHED*/
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}
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ack();
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err = 0;
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for (i = 0; i < size; i += SPL_BUFSIZ) {
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amt = SPL_BUFSIZ;
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cp = buf;
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if (i + amt > size)
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amt = size - i;
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do {
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j = read(STDOUT_FILENO, cp, amt);
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if (j <= 0) {
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frecverr("%s: lost connection", pp->printer);
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/*NOTREACHED*/
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}
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amt -= j;
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cp += j;
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} while (amt > 0);
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amt = SPL_BUFSIZ;
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if (i + amt > size)
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amt = size - i;
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if (write(fd, buf, amt) != (ssize_t)amt) {
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err++;
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break;
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}
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}
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(void) close(fd);
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if (err) {
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frecverr("%s: write error on close(%s)", pp->printer, file);
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/*NOTREACHED*/
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}
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if (noresponse()) { /* file sent had bad data in it */
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if (strchr(file, '/') == NULL)
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(void) unlink(file);
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return (0);
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}
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ack();
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return (1);
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}
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static int
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noresponse(void)
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{
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char resp;
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if (read(STDOUT_FILENO, &resp, (size_t)1) != 1) {
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frecverr("lost connection in noresponse()");
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/*NOTREACHED*/
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}
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if (resp == '\0')
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return(0);
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return(1);
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}
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/*
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* Check to see if there is enough space on the disk for size bytes.
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* 1 == OK, 0 == Not OK.
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*/
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static int
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chksize(int size)
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{
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int spacefree;
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struct statfs sfb;
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if (statfs(".", &sfb) < 0) {
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syslog(LOG_ERR, "%s: %m", "statfs(\".\")");
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return (1);
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}
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spacefree = sfb.f_bavail * (sfb.f_bsize / 512);
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size = (size + 511) / 512;
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if (minfree + size > spacefree)
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return(0);
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return(1);
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}
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static int
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read_number(const char *fn)
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{
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char lin[80];
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register FILE *fp;
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if ((fp = fopen(fn, "r")) == NULL)
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return (0);
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if (fgets(lin, 80, fp) == NULL) {
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fclose(fp);
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return (0);
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}
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fclose(fp);
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return (atoi(lin));
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}
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/*
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* Remove all the files associated with the current job being transfered.
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*/
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static void
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rcleanup(int signo __unused)
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{
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if (tfname[0] && strchr(tfname, '/') == NULL)
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(void) unlink(tfname);
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if (dfname[0] && strchr(dfname, '/') == NULL) {
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do {
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do
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(void) unlink(dfname);
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while (dfname[2]-- != 'A');
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dfname[2] = 'z';
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} while (dfname[0]-- != 'd');
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}
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dfname[0] = '\0';
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}
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#include <stdarg.h>
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static void
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frecverr(const char *msg, ...)
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{
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va_list ap;
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va_start(ap, msg);
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syslog(LOG_ERR, "Error receiving job from %s:", from_host);
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vsyslog(LOG_ERR, msg, ap);
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va_end(ap);
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/*
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* rcleanup is not called until AFTER logging the error message,
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* because rcleanup will zap some variables which may have been
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* supplied as parameters for that msg...
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*/
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rcleanup(0);
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/*
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* Add a minimal delay before returning the final error code to
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* the sending host. This just in case that machine responds
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* this error by INSTANTLY retrying (and instantly re-failing...).
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* It would be stupid of the sending host to do that, but if there
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* was a broken implementation which did it, the result might be
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* obscure performance problems and a flood of syslog messages on
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* the receiving host.
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*/
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sleep(2); /* a paranoid throttling measure */
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putchar('\1'); /* return error code */
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exit(1);
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}
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