NetBSD/usr.bin/quota/quota.c

/*	$NetBSD: quota.c,v 1.43 2011/11/30 16:12:32 dholland Exp $	*/

/*
 * 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. 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) 1980, 1990, 1993\
 The Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)quota.c	8.4 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: quota.c,v 1.43 2011/11/30 16:12:32 dholland Exp $");
#endif
#endif /* not lint */

/*
 * Disk quota reporting program.
 */
#include <sys/param.h>
#include <sys/types.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <sys/socket.h>

#include <assert.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fstab.h>
#include <grp.h>
#include <netdb.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include <quota/quotaprop.h>
#include <quota/quota.h>

#include "printquota.h"
#include "getvfsquota.h"

struct quotause {
	struct	quotause *next;
	long	flags;
	uid_t	id;
	struct	quotaval *qvs;
	unsigned numqvs;
	char	fsname[MAXPATHLEN + 1];
};
#define	FOUND	0x01
#define	QUOTA2	0x02

static int	anyusage(struct quotaval *, unsigned);
static int	anyover(struct quotaval *, unsigned, time_t);
static const char *getovermsg(struct quotaval *, const char *, time_t);
static struct quotause	*getprivs(id_t, int);
static void	heading(int, id_t, const char *, const char *);
static int	isover(struct quotaval *qv, time_t now);
static void	printqv(struct quotaval *, int, int, time_t);
static void	showgid(gid_t);
static void	showgrpname(const char *);
static void	showonequota(int, id_t, const char *, struct quotause *);
static void	showquotas(int, id_t, const char *);
static void	showuid(uid_t);
static void	showusrname(const char *);
static int	unlimited(struct quotaval *qvs, unsigned numqvs);
static void	usage(void) __dead;

static int	qflag = 0;
static int	vflag = 0;
static int	hflag = 0;
static int	dflag = 0;
static int	Dflag = 0;
static uid_t	myuid;
static int needheading;

int
main(int argc, char *argv[])
{
	int ngroups; 
	gid_t mygid, gidset[NGROUPS];
	int i, gflag = 0, uflag = 0;
	int ch;

	myuid = getuid();
	while ((ch = getopt(argc, argv, "Ddhugvq")) != -1) {
		switch(ch) {
		case 'g':
			gflag++;
			break;
		case 'u':
			uflag++;
			break;
		case 'v':
			vflag++;
			break;
		case 'q':
			qflag++;
			break;
		case 'h':
			hflag++;
			break;
		case 'd':
			dflag++;
			break;
		case 'D':
			Dflag++;
			break;
		default:
			usage();
		}
	}
	argc -= optind;
	argv += optind;
	if (!uflag && !gflag)
		uflag++;
	if (dflag) {
#if 0
		if (myuid != 0)
			errx(1, "-d: permission denied");
#endif
		if (uflag)
			showquotas(QUOTA_CLASS_USER, 0, "");
		if (gflag)
			showquotas(QUOTA_CLASS_GROUP, 0, "");
		return 0;
	}
	if (argc == 0) {
		if (uflag)
			showuid(myuid);
		if (gflag) {
			if (dflag)
				showgid(0);
			else {
				mygid = getgid();
				ngroups = getgroups(NGROUPS, gidset);
				if (ngroups < 0)
					err(1, "getgroups");
				showgid(mygid);
				for (i = 0; i < ngroups; i++)
					if (gidset[i] != mygid)
						showgid(gidset[i]);
			}
		}
		return 0;
	}
	if (uflag && gflag)
		usage();
	if (uflag) {
		for (; argc > 0; argc--, argv++) {
			if (alldigits(*argv))
				showuid((uid_t)atoi(*argv));
			else
				showusrname(*argv);
		}
		return 0;
	}
	if (gflag) {
		for (; argc > 0; argc--, argv++) {
			if (alldigits(*argv))
				showgid((gid_t)atoi(*argv));
			else
				showgrpname(*argv);
		}
		return 0;
	}
	/* NOTREACHED */
	return 0;
}

static void
usage(void)
{
	const char *p = getprogname();
	fprintf(stderr, "Usage: %s [-Dhguqv]\n"
	    "\t%s [-Dhqv] -u username ...\n"
	    "\t%s [-Dhqv] -g groupname ...\n"
	    "\t%s -d [-Dhguqv]\n", p, p, p, p);
	exit(1);
}

/*
 * Print out quotas for a specified user identifier.
 */
static void
showuid(uid_t uid)
{
	struct passwd *pwd = getpwuid(uid);
	const char *name;

	if (pwd == NULL)
		name = "(no account)";
	else
		name = pwd->pw_name;
	if (uid != myuid && myuid != 0) {
		warnx("%s (uid %d): permission denied", name, uid);
		return;
	}
	showquotas(QUOTA_CLASS_USER, uid, name);
}

/*
 * Print out quotas for a specified user name.
 */
static void
showusrname(const char *name)
{
	struct passwd *pwd = getpwnam(name);

	if (pwd == NULL) {
		warnx("%s: unknown user", name);
		return;
	}
	if (pwd->pw_uid != myuid && myuid != 0) {
		warnx("%s (uid %d): permission denied", name, pwd->pw_uid);
		return;
	}
	showquotas(QUOTA_CLASS_USER, pwd->pw_uid, name);
}

/*
 * Print out quotas for a specified group identifier.
 */
static void
showgid(gid_t gid)
{
	struct group *grp = getgrgid(gid);
	int ngroups;
	gid_t mygid, gidset[NGROUPS];
	int i;
	const char *name;

	if (grp == NULL)
		name = "(no entry)";
	else
		name = grp->gr_name;
	mygid = getgid();
	ngroups = getgroups(NGROUPS, gidset);
	if (ngroups < 0) {
		warn("getgroups");
		return;
	}
	if (gid != mygid) {
		for (i = 0; i < ngroups; i++)
			if (gid == gidset[i])
				break;
		if (i >= ngroups && myuid != 0) {
			warnx("%s (gid %d): permission denied", name, gid);
			return;
		}
	}
	showquotas(QUOTA_CLASS_GROUP, gid, name);
}

/*
 * Print out quotas for a specified group name.
 */
static void
showgrpname(const char *name)
{
	struct group *grp = getgrnam(name);
	int ngroups;
	gid_t mygid, gidset[NGROUPS];
	int i;

	if (grp == NULL) {
		warnx("%s: unknown group", name);
		return;
	}
	mygid = getgid();
	ngroups = getgroups(NGROUPS, gidset);
	if (ngroups < 0) {
		warn("getgroups");
		return;
	}
	if (grp->gr_gid != mygid) {
		for (i = 0; i < ngroups; i++)
			if (grp->gr_gid == gidset[i])
				break;
		if (i >= ngroups && myuid != 0) {
			warnx("%s (gid %d): permission denied",
			    name, grp->gr_gid);
			return;
		}
	}
	showquotas(QUOTA_CLASS_GROUP, grp->gr_gid, name);
}

static void
showquotas(int type, id_t id, const char *idname)
{
	struct quotause *qup;
	struct quotause *quplist;

	needheading = 1;

	quplist = getprivs(id, type);
	for (qup = quplist; qup; qup = qup->next) {
		showonequota(type, id, idname, qup);
	}
	if (!qflag) {
		/* In case nothing printed, issue a header saying "none" */
		heading(type, id, idname, "none");
	}
}

static void
showonequota(int type, id_t id, const char *idname, struct quotause *qup)
{
	static const int isbytes[QUOTA_NLIMITS] = {
		[QUOTA_LIMIT_BLOCK] = 1, 
		[QUOTA_LIMIT_FILE] = 0,
	};
	static time_t now;
	struct quotaval *qvs;
	unsigned numqvs, i;
	const char *msg;
	int isquota2;

	qvs = qup->qvs;
	numqvs = qup->numqvs;

	if (now == 0) {
		time(&now);
	}

	if (!vflag && unlimited(qvs, numqvs)) {
		return;
	}

	if (qflag) {
		for (i=0; i<numqvs; i++) {
			msg = getovermsg(&qvs[i], ufs_quota_limit_names[i],
					 now);
			if (msg != NULL) {
				heading(type, id, idname, "");
				printf("\t%s %s\n", msg, qup->fsname);
			}
		}
		return;
	}

	/*
	 * XXX: anyover can in fact be true if anyusage is not true,
	 * if there's a quota of zero set on some volume. This is
	 * because the check we do checks if adding one more thing
	 * will go over. That is reasonable, I suppose, but Arguably
	 * the resulting behavior with usage 0 is a bug. (Also, what
	 * reason do we have to believe that the reported grace expire
	 * time is valid if we aren't in fact over yet?)
	 */

	if (vflag || dflag || anyover(qvs, numqvs, now) || 
	    anyusage(qvs, numqvs)) {
		heading(type, id, idname, "");
		if (strlen(qup->fsname) > 4) {
			printf("%s\n", qup->fsname);
			printf("%12s", "");
		} else {
			printf("%12s", qup->fsname);
		}

		isquota2 = (qup->flags & QUOTA2) != 0;

		for (i=0; i<numqvs; i++) {
			printqv(&qvs[i], isquota2, 
				i >= QUOTA_NLIMITS ? 0 : isbytes[i], now);
		}
		printf("\n");
	}
}

static void
heading(int type, id_t id, const char *idname, const char *tag)
{
	if (needheading == 0)
		return;
	needheading = 0;

	if (dflag)
		printf("Default %s disk quotas: %s\n",
		    ufs_quota_class_names[type], tag);
	else
		printf("Disk quotas for %s %s (%cid %u): %s\n",
		    ufs_quota_class_names[type], idname,
		    *ufs_quota_class_names[type], id, tag);

	if (!qflag && tag[0] == '\0') {
		printf("%12s%9s %8s%9s%8s%8s %7s%8s%8s\n"
		    , "Filesystem"
		    , "blocks"
		    , "quota"
		    , "limit"
		    , "grace"
		    , "files"
		    , "quota"
		    , "limit"
		    , "grace"
		);
	}
}

static void
printqv(struct quotaval *qv, int isquota2, int isbytes, time_t now)
{
	char buf[20];
	const char *str;
	int intprtflags, over, width;

	/*
	 * The assorted finagling of width is to match the previous
	 * open-coded formatting for exactly two quota object types,
	 * which was chosen to make the default report fit in 80
	 * columns.
	 */

	width = isbytes ? 9 : 8;
	intprtflags = isbytes ? HN_B : 0;
	over = isover(qv, now);

	str = intprt(buf, width, qv->qv_usage, intprtflags, hflag);
	printf("%*s", width, str);

	printf("%c", over ? '*' : ' ');

	str = intprt(buf, width, qv->qv_softlimit, intprtflags, hflag);
	printf("%*s", width-1, str);

	str = intprt(buf, width, qv->qv_hardlimit, intprtflags, hflag);
	printf("%*s", width, str);

	if (over) {
		str = timeprt(buf, 9, now, qv->qv_expiretime);
	} else if (isquota2 && vflag) {
		str = timeprt(buf, 9, 0, qv->qv_grace);
	} else {
		str = "";
	}
	printf("%8s", str);
}

/*
 * Collect the requested quota information.
 */
static struct quotause *
getprivs(id_t id, int quotatype)
{
	struct quotause *qup, *quptail;
	struct quotause *quphead;
	struct statvfs *fst;
	int nfst, i;
	int8_t version;

	qup = quphead = quptail = NULL;

	nfst = getmntinfo(&fst, MNT_WAIT);
	if (nfst == 0)
		errx(2, "no filesystems mounted!");
	for (i = 0; i < nfst; i++) {
		if (qup == NULL) {
			if ((qup = malloc(sizeof *qup)) == NULL)
				err(1, "Out of memory");
		}
		if (strncmp(fst[i].f_fstypename, "nfs", 
		    sizeof(fst[i].f_fstypename)) == 0) {
			version = 0;
			qup->numqvs = QUOTA_NLIMITS;
			qup->qvs = malloc(qup->numqvs * sizeof(qup->qvs[0]));
			if (qup->qvs == NULL) {
				err(1, "Out of memory");
			}
			if (getnfsquota(fst[i].f_mntfromname,
			    qup->qvs, id, ufs_quota_class_names[quotatype]) != 1)
				continue;
		} else if ((fst[i].f_flag & ST_QUOTA) != 0) {
			qup->numqvs = QUOTA_NLIMITS;
			qup->qvs = malloc(qup->numqvs * sizeof(qup->qvs[0]));
			if (qup->qvs == NULL) {
				err(1, "Out of memory");
			}
			if (getvfsquota(fst[i].f_mntonname, qup->qvs, &version,
			    id, quotatype, dflag, Dflag) != 1)
				continue;
		} else
			continue;
		(void)strncpy(qup->fsname, fst[i].f_mntonname,
		    sizeof(qup->fsname) - 1);
		if (version == 2)
			qup->flags |= QUOTA2;
		if (quphead == NULL)
			quphead = qup;
		else
			quptail->next = qup;
		quptail = qup;
		quptail->next = 0;
		qup = NULL;
	}
	free(qup);
	return quphead;
}

static int
unlimited(struct quotaval *qvs, unsigned numqvs)
{
	unsigned i;

	for (i=0; i<numqvs; i++) {
		if (qvs[i].qv_softlimit != UQUAD_MAX ||
		    qvs[i].qv_hardlimit != UQUAD_MAX) {
			return 0;
		}
	}
	return 1;
}

static int
anyusage(struct quotaval *qvs, unsigned numqvs)
{
	unsigned i;

	for (i=0; i<numqvs; i++) {
		if (qvs[i].qv_usage > 0) {
			return 1;
		}
	}
	return 0;
}

static int
anyover(struct quotaval *qvs, unsigned numqvs, time_t now)
{
	unsigned i;

	for (i=0; i<numqvs; i++) {
		if (isover(&qvs[i], now)) {
			return 1;
		}
	}
	return 0;
}

static int
isover(struct quotaval *qv, time_t now)
{
	int ql_stat;

	ql_stat = quota_check_limit(qv->qv_usage, 1,
				    qv->qv_softlimit,
				    qv->qv_hardlimit,
				    qv->qv_expiretime, now);
	switch(QL_STATUS(ql_stat)) {
	    case QL_S_DENY_HARD:
	    case QL_S_DENY_GRACE:
	    case QL_S_ALLOW_SOFT:
		return 1;
	    default:
		break;
	}
	return 0;
}

static const char *
getovermsg(struct quotaval *qv, const char *what, time_t now)
{
	static char buf[64];
	int ql_stat;

	ql_stat = quota_check_limit(qv->qv_usage, 1,
				    qv->qv_softlimit,
				    qv->qv_hardlimit,
				    qv->qv_expiretime, now);
	switch(QL_STATUS(ql_stat)) {
	    case QL_S_DENY_HARD:
		snprintf(buf, sizeof(buf), "%c%s limit reached on",
			 toupper((unsigned char)what[0]), what+1);
		break;
	    case QL_S_DENY_GRACE:
		snprintf(buf, sizeof(buf), "Over %s quota on", what);
		break;
	    case QL_S_ALLOW_SOFT:
		snprintf(buf, sizeof(buf), "In %s grace period on", what);
		break;
	    default:
		return NULL;
	}
	return buf;
}