lpr.c

早期freebsd实现

/*
 * Copyright (c) 1983, 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 *
 * 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, 1989, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)lpr.c	8.3 (Berkeley) 3/30/94";
#endif /* not lint */

/*
 *      lpr -- off line print
 *
 * Allows multiple printers and printers on remote machines by
 * using information from a printer data base.
 */

#include <sys/param.h>
#include <sys/stat.h>

#include <dirent.h>
#include <fcntl.h>
#include <a.out.h>
#include <signal.h>
#include <syslog.h>
#include <pwd.h>
#include <grp.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include "lp.h"
#include "lp.local.h"
#include "pathnames.h"

static char	*cfname;	/* daemon control files, linked from tf's */
static char	*class = host;	/* class title on header page */
static char	*dfname;		/* data files */
static char	*fonts[4];	/* troff font names */
static char	 format = 'f';	/* format char for printing files */
static int	 hdr = 1;	/* print header or not (default is yes) */
static int	 iflag;		/* indentation wanted */
static int	 inchar;	/* location to increment char in file names */
static int	 indent;	/* amount to indent */
static char	*jobname;	/* job name on header page */
static int	 mailflg;	/* send mail */
static int	 nact;		/* number of jobs to act on */
static int	 ncopies = 1;	/* # of copies to make */
static char	*person;	/* user name */
static int	 qflag;		/* q job, but don't exec daemon */
static int	 rflag;		/* remove files upon completion */	
static int	 sflag;		/* symbolic link flag */
static int	 tfd;		/* control file descriptor */
static char	*tfname;	/* tmp copy of cf before linking */
static char	*title;		/* pr'ing title */
static int	 userid;	/* user id */
static char	*width;		/* width for versatec printing */

static struct stat statb;

static void	 card __P((int, char *));
static void	 chkprinter __P((char *));
static void	 cleanup __P((int));
static void	 copy __P((int, char []));
static void	 fatal2 __P((const char *, ...));
static char	*itoa __P((int));
static char	*linked __P((char *));
static char	*lmktemp __P((char *, int, int));
static void	 mktemps __P((void));
static int	 nfile __P((char *));
static int	 test __P((char *));

void
main(argc, argv)
	int argc;
	char *argv[];
{
	struct passwd *pw;
	struct group *gptr;
	extern char *itoa();
	register char *arg, *cp;
	char buf[BUFSIZ];
	int i, f;
	struct stat stb;

	if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
		signal(SIGHUP, cleanup);
	if (signal(SIGINT, SIG_IGN) != SIG_IGN)
		signal(SIGINT, cleanup);
	if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
		signal(SIGQUIT, cleanup);
	if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
		signal(SIGTERM, cleanup);

	name = argv[0];
	gethostname(host, sizeof (host));
	openlog("lpd", 0, LOG_LPR);

	while (argc > 1 && argv[1][0] == '-') {
		argc--;
		arg = *++argv;
		switch (arg[1]) {

		case 'P':		/* specifiy printer name */
			if (arg[2])
				printer = &arg[2];
			else if (argc > 1) {
				argc--;
				printer = *++argv;
			}
			break;

		case 'C':		/* classification spec */
			hdr++;
			if (arg[2])
				class = &arg[2];
			else if (argc > 1) {
				argc--;
				class = *++argv;
			}
			break;

		case 'U':		/* user name */
			hdr++;
			if (arg[2])
				person = &arg[2];
			else if (argc > 1) {
				argc--;
				person = *++argv;
			}
			break;

		case 'J':		/* job name */
			hdr++;
			if (arg[2])
				jobname = &arg[2];
			else if (argc > 1) {
				argc--;
				jobname = *++argv;
			}
			break;

		case 'T':		/* pr's title line */
			if (arg[2])
				title = &arg[2];
			else if (argc > 1) {
				argc--;
				title = *++argv;
			}
			break;

		case 'l':		/* literal output */
		case 'p':		/* print using ``pr'' */
		case 't':		/* print troff output (cat files) */
		case 'n':		/* print ditroff output */
		case 'd':		/* print tex output (dvi files) */
		case 'g':		/* print graph(1G) output */
		case 'c':		/* print cifplot output */
		case 'v':		/* print vplot output */
			format = arg[1];
			break;

		case 'f':		/* print fortran output */
			format = 'r';
			break;

		case '4':		/* troff fonts */
		case '3':
		case '2':
		case '1':
			if (argc > 1) {
				argc--;
				fonts[arg[1] - '1'] = *++argv;
			}
			break;

		case 'w':		/* versatec page width */
			width = arg+2;
			break;

		case 'r':		/* remove file when done */
			rflag++;
			break;

		case 'm':		/* send mail when done */
			mailflg++;
			break;

		case 'h':		/* toggle want of header page */
			hdr = !hdr;
			break;

		case 's':		/* try to link files */
			sflag++;
			break;

		case 'q':		/* just q job */
			qflag++;
			break;

		case 'i':		/* indent output */
			iflag++;
			indent = arg[2] ? atoi(&arg[2]) : 8;
			break;

		case '#':		/* n copies */
			if (isdigit(arg[2])) {
				i = atoi(&arg[2]);
				if (i > 0)
					ncopies = i;
			}
		}
	}
	if (printer == NULL && (printer = getenv("PRINTER")) == NULL)
		printer = DEFLP;
	chkprinter(printer);
	if (SC && ncopies > 1)
		fatal2("multiple copies are not allowed");
	if (MC > 0 && ncopies > MC)
		fatal2("only %d copies are allowed", MC);
	/*
	 * Get the identity of the person doing the lpr using the same
	 * algorithm as lprm. 
	 */
	userid = getuid();
	if (userid != DU || person == 0) {
		if ((pw = getpwuid(userid)) == NULL)
			fatal2("Who are you?");
		person = pw->pw_name;
	}
	/*
	 * Check for restricted group access.
	 */
	if (RG != NULL && userid != DU) {
		if ((gptr = getgrnam(RG)) == NULL)
			fatal2("Restricted group specified incorrectly");
		if (gptr->gr_gid != getgid()) {
			while (*gptr->gr_mem != NULL) {
				if ((strcmp(person, *gptr->gr_mem)) == 0)
					break;
				gptr->gr_mem++;
			}
			if (*gptr->gr_mem == NULL)
				fatal2("Not a member of the restricted group");
		}
	}
	/*
	 * Check to make sure queuing is enabled if userid is not root.
	 */
	(void) sprintf(buf, "%s/%s", SD, LO);
	if (userid && stat(buf, &stb) == 0 && (stb.st_mode & 010))
		fatal2("Printer queue is disabled");
	/*
	 * Initialize the control file.
	 */
	mktemps();
	tfd = nfile(tfname);
	(void) fchown(tfd, DU, -1);	/* owned by daemon for protection */
	card('H', host);
	card('P', person);
	if (hdr) {
		if (jobname == NULL) {
			if (argc == 1)
				jobname = "stdin";
			else
				jobname = (arg = rindex(argv[1], '/')) ? arg+1 : argv[1];
		}
		card('J', jobname);
		card('C', class);
		card('L', person);
	}
	if (iflag)
		card('I', itoa(indent));
	if (mailflg)
		card('M', person);
	if (format == 't' || format == 'n' || format == 'd')
		for (i = 0; i < 4; i++)
			if (fonts[i] != NULL)
				card('1'+i, fonts[i]);
	if (width != NULL)
		card('W', width);

	/*
	 * Read the files and spool them.
	 */
	if (argc == 1)
		copy(0, " ");
	else while (--argc) {
		if ((f = test(arg = *++argv)) < 0)
			continue;	/* file unreasonable */

		if (sflag && (cp = linked(arg)) != NULL) {
			(void) sprintf(buf, "%d %d", statb.st_dev, statb.st_ino);
			card('S', buf);
			if (format == 'p')
				card('T', title ? title : arg);
			for (i = 0; i < ncopies; i++)
				card(format, &dfname[inchar-2]);
			card('U', &dfname[inchar-2]);
			if (f)
				card('U', cp);
			card('N', arg);
			dfname[inchar]++;
			nact++;
			continue;
		}
		if (sflag)
			printf("%s: %s: not linked, copying instead\n", name, arg);
		if ((i = open(arg, O_RDONLY)) < 0) {
			printf("%s: cannot open %s\n", name, arg);
			continue;
		}
		copy(i, arg);
		(void) close(i);
		if (f && unlink(arg) < 0)
			printf("%s: %s: not removed\n", name, arg);
	}

	if (nact) {
		(void) close(tfd);
		tfname[inchar]--;
		/*
		 * Touch the control file to fix position in the queue.
		 */
		if ((tfd = open(tfname, O_RDWR)) >= 0) {
			char c;

			if (read(tfd, &c, 1) == 1 &&
			    lseek(tfd, (off_t)0, 0) == 0 &&
			    write(tfd, &c, 1) != 1) {
				printf("%s: cannot touch %s\n", name, tfname);
				tfname[inchar]++;
				cleanup(0);