edquota.c

早期freebsd实现

/*
 * Copyright (c) 1980, 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Robert Elz at The University of Melbourne.
 *
 * 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) 1980, 1990, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)edquota.c	8.1 (Berkeley) 6/6/93";
#endif /* not lint */

/*
 * Disk quota editor.
 */
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/wait.h>
#include <ufs/ufs/quota.h>
#include <errno.h>
#include <fstab.h>
#include <pwd.h>
#include <grp.h>
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "pathnames.h"

char *qfname = QUOTAFILENAME;
char *qfextension[] = INITQFNAMES;
char *quotagroup = QUOTAGROUP;
char tmpfil[] = _PATH_TMP;

struct quotause {
	struct	quotause *next;
	long	flags;
	struct	dqblk dqblk;
	char	fsname[MAXPATHLEN + 1];
	char	qfname[1];	/* actually longer */
} *getprivs();
#define	FOUND	0x01

main(argc, argv)
	register char **argv;
	int argc;
{
	register struct quotause *qup, *protoprivs, *curprivs;
	extern char *optarg;
	extern int optind;
	register long id, protoid;
	register int quotatype, tmpfd;
	char *protoname, ch;
	int tflag = 0, pflag = 0;

	if (argc < 2)
		usage();
	if (getuid()) {
		fprintf(stderr, "edquota: permission denied\n");
		exit(1);
	}
	quotatype = USRQUOTA;
	while ((ch = getopt(argc, argv, "ugtp:")) != EOF) {
		switch(ch) {
		case 'p':
			protoname = optarg;
			pflag++;
			break;
		case 'g':
			quotatype = GRPQUOTA;
			break;
		case 'u':
			quotatype = USRQUOTA;
			break;
		case 't':
			tflag++;
			break;
		default:
			usage();
		}
	}
	argc -= optind;
	argv += optind;
	if (pflag) {
		if ((protoid = getentry(protoname, quotatype)) == -1)
			exit(1);
		protoprivs = getprivs(protoid, quotatype);
		for (qup = protoprivs; qup; qup = qup->next) {
			qup->dqblk.dqb_btime = 0;
			qup->dqblk.dqb_itime = 0;
		}
		while (argc-- > 0) {
			if ((id = getentry(*argv++, quotatype)) < 0)
				continue;
			putprivs(id, quotatype, protoprivs);
		}
		exit(0);
	}
	tmpfd = mkstemp(tmpfil);
	fchown(tmpfd, getuid(), getgid());
	if (tflag) {
		protoprivs = getprivs(0, quotatype);
		if (writetimes(protoprivs, tmpfd, quotatype) == 0)
			exit(1);
		if (editit(tmpfil) && readtimes(protoprivs, tmpfd))
			putprivs(0, quotatype, protoprivs);
		freeprivs(protoprivs);
		exit(0);
	}
	for ( ; argc > 0; argc--, argv++) {
		if ((id = getentry(*argv, quotatype)) == -1)
			continue;
		curprivs = getprivs(id, quotatype);
		if (writeprivs(curprivs, tmpfd, *argv, quotatype) == 0)
			continue;
		if (editit(tmpfil) && readprivs(curprivs, tmpfd))
			putprivs(id, quotatype, curprivs);
		freeprivs(curprivs);
	}
	close(tmpfd);
	unlink(tmpfil);
	exit(0);
}

usage()
{
	fprintf(stderr, "%s%s%s%s",
		"Usage: edquota [-u] [-p username] username ...\n",
		"\tedquota -g [-p groupname] groupname ...\n",
		"\tedquota [-u] -t\n", "\tedquota -g -t\n");
	exit(1);
}

/*
 * This routine converts a name for a particular quota type to
 * an identifier. This routine must agree with the kernel routine
 * getinoquota as to the interpretation of quota types.
 */
getentry(name, quotatype)
	char *name;
	int quotatype;
{
	struct passwd *pw;
	struct group *gr;

	if (alldigits(name))
		return (atoi(name));
	switch(quotatype) {
	case USRQUOTA:
		if (pw = getpwnam(name))
			return (pw->pw_uid);
		fprintf(stderr, "%s: no such user\n", name);
		break;
	case GRPQUOTA:
		if (gr = getgrnam(name))
			return (gr->gr_gid);
		fprintf(stderr, "%s: no such group\n", name);
		break;
	default:
		fprintf(stderr, "%d: unknown quota type\n", quotatype);
		break;
	}
	sleep(1);
	return (-1);
}

/*
 * Collect the requested quota information.
 */
struct quotause *
getprivs(id, quotatype)
	register long id;
	int quotatype;
{
	register struct fstab *fs;
	register struct quotause *qup, *quptail;
	struct quotause *quphead;
	int qcmd, qupsize, fd;
	char *qfpathname;
	static int warned = 0;
	extern int errno;

	setfsent();
	quphead = (struct quotause *)0;
	qcmd = QCMD(Q_GETQUOTA, quotatype);
	while (fs = getfsent()) {
		if (strcmp(fs->fs_vfstype, "ufs"))
			continue;
		if (!hasquota(fs, quotatype, &qfpathname))
			continue;
		qupsize = sizeof(*qup) + strlen(qfpathname);
		if ((qup = (struct quotause *)malloc(qupsize)) == NULL) {
			fprintf(stderr, "edquota: out of memory\n");
			exit(2);
		}
		if (quotactl(fs->fs_file, qcmd, id, &qup->dqblk) != 0) {
	    		if (errno == EOPNOTSUPP && !warned) {
				warned++;
				fprintf(stderr, "Warning: %s\n",
				    "Quotas are not compiled into this kernel");
				sleep(3);
			}
			if ((fd = open(qfpathname, O_RDONLY)) < 0) {
				fd = open(qfpathname, O_RDWR|O_CREAT, 0640);
				if (fd < 0 && errno != ENOENT) {
					perror(qfpathname);
					free(qup);
					continue;
				}
				fprintf(stderr, "Creating quota file %s\n",
				    qfpathname);
				sleep(3);
				(void) fchown(fd, getuid(),
				    getentry(quotagroup, GRPQUOTA));
				(void) fchmod(fd, 0640);
			}
			lseek(fd, (long)(id * sizeof(struct dqblk)), L_SET);
			switch (read(fd, &qup->dqblk, sizeof(struct dqblk))) {
			case 0:			/* EOF */
				/*
				 * Convert implicit 0 quota (EOF)
				 * into an explicit one (zero'ed dqblk)
				 */
				bzero((caddr_t)&qup->dqblk,
				    sizeof(struct dqblk));
				break;

			case sizeof(struct dqblk):	/* OK */
				break;

			default:		/* ERROR */
				fprintf(stderr, "edquota: read error in ");
				perror(qfpathname);
				close(fd);
				free(qup);
				continue;
			}
			close(fd);
		}
		strcpy(qup->qfname, qfpathname);
		strcpy(qup->fsname, fs->fs_file);
		if (quphead == NULL)
			quphead = qup;
		else
			quptail->next = qup;
		quptail = qup;
		qup->next = 0;
	}
	endfsent();
	return (quphead);
}

/*
 * Store the requested quota information.
 */
putprivs(id, quotatype, quplist)
	long id;
	int quotatype;
	struct quotause *quplist;
{
	register struct quotause *qup;
	int qcmd, fd;

	qcmd = QCMD(Q_SETQUOTA, quotatype);
	for (qup = quplist; qup; qup = qup->next) {
		if (quotactl(qup->fsname, qcmd, id, &qup->dqblk) == 0)
			continue;
		if ((fd = open(qup->qfname, O_WRONLY)) < 0) {
			perror(qup->qfname);
		} else {
			lseek(fd, (long)id * (long)sizeof (struct dqblk), 0);
			if (write(fd, &qup->dqblk, sizeof (struct dqblk)) !=
			    sizeof (struct dqblk)) {
				fprintf(stderr, "edquota: ");
				perror(qup->qfname);
			}
			close(fd);
		}
	}
}

/*
 * Take a list of priviledges and get it edited.
 */
editit(tmpfile)
	char *tmpfile;
{
	long omask;
	int pid, stat;
	extern char *getenv();

	omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
 top:
	if ((pid = fork()) < 0) {
		extern errno;

		if (errno == EPROCLIM) {
			fprintf(stderr, "You have too many processes\n");
			return(0);
		}
		if (errno == EAGAIN) {
			sleep(1);
			goto top;
		}
		perror("fork");
		return (0);
	}
	if (pid == 0) {
		register char *ed;

		sigsetmask(omask);
		setgid(getgid());
		setuid(getuid());
		if ((ed = getenv("EDITOR")) == (char *)0)
			ed = _PATH_VI;
		execlp(ed, ed, tmpfile, 0);
		perror(ed);
		exit(1);
	}
	waitpid(pid, &stat, 0);
	sigsetmask(omask);
	if (!WIFEXITED(stat) || WEXITSTATUS(stat) != 0)
		return (0);
	return (1);
}

/*