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/*
* QUOTA An implementation of the diskquota system for the LINUX
* operating system. QUOTA is implemented using the BSD systemcall
* interface as the means of communication with the user level.
* Should work for all filesystems because of integration into the
* VFS layer of the operating system.
* This is based on the Melbourne quota system wich uses both user and
* group quota files.
*
* This part does the lookup of the info.
*
* Version: $Id: rquota_server.c,v 2.9 1996/11/17 16:59:46 mvw Exp mvw $
*
* Author: Marco van Wieringen <mvw@planets.elm.net>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include "config.h"
#include <rpc/rpc.h>
#include "rquota.h"
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <sys/quota.h>
#include <sys/mount.h>
#include <dirent.h>
#include <paths.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "mntent.h"
#include "xmalloc.h"
#define TYPE_EXTENDED 0x01
#define ACTIVE 0x02
#ifndef MNTTYPE_AUTOFS
#define MNTTYPE_AUTOFS "autofs"
#endif
#ifndef BLOCK_SIZE
#define BLOCK_SIZE 1024
#endif
/*
* Global unix authentication credentials.
*/
extern struct authunix_parms *unix_cred;
int in_group (gid_t *gids, u_int len, gid_t gid)
{
int cnt = 0;
while (cnt < len) {
if (gids[cnt] == gid)
return 1;
cnt++;
}
return 0;
}
getquota_rslt *getquotainfo(int flags, caddr_t *argp, struct svc_req *rqstp)
{
static getquota_rslt result;
union {
getquota_args *args;
ext_getquota_args *ext_args;
} arguments;
FILE *fp;
struct dqblk dq_dqb;
struct mntent *mnt;
char *pathname, *qfpathname;
int fd, err, id, type;
struct stat stm, stn;
/*
* First check authentication.
*/
if (flags & TYPE_EXTENDED) {
arguments.ext_args = (ext_getquota_args *)argp;
id = arguments.ext_args->gqa_id;
type = arguments.ext_args->gqa_type;
pathname = arguments.ext_args->gqa_pathp;
if (type == USRQUOTA && unix_cred->aup_uid && unix_cred->aup_uid != id) {
result.status = Q_EPERM;
return(&result);
}
if (type == GRPQUOTA && unix_cred->aup_uid && unix_cred->aup_gid != id &&
!in_group((gid_t *)unix_cred->aup_gids, unix_cred->aup_len, id)) {
result.status = Q_EPERM;
return(&result);
}
} else {
arguments.args = (getquota_args *)argp;
id = arguments.args->gqa_uid;
type = USRQUOTA;
pathname = arguments.args->gqa_pathp;
if (unix_cred->aup_uid && unix_cred->aup_uid != id) {
result.status = Q_EPERM;
return(&result);
}
}
fp = setmntent(MNTTAB, "r");
while ((mnt = getmntent(fp)) != (struct mntent *)0) {
if (stat(mnt->mnt_dir, &stm) == -1)
continue;
if (stat(pathname, &stn) == -1)
break;
else if (stm.st_dev != stn.st_dev)
continue;
if (mnt->mnt_fsname [0] != '/'
|| strcasecmp (mnt->mnt_type, MNTTYPE_NFS) == 0
|| strcasecmp (mnt->mnt_type, MNTTYPE_AUTOFS) == 0
|| strcasecmp (mnt->mnt_type, MNTTYPE_SWAP) == 0
|| strcasecmp (mnt->mnt_type, MNTTYPE_IGNORE) == 0)
break;
/* All blocks reported are in BLOCK_SIZE. */
result.getquota_rslt_u.gqr_rquota.rq_bsize = BLOCK_SIZE;
if (hasquota(mnt, type, &qfpathname)) {
if ((err = quotactl(QCMD(Q_GETQUOTA, type), mnt->mnt_fsname,
id, (caddr_t)&dq_dqb)) == -1
&& !(flags & ACTIVE)) {
if ((fd = open(qfpathname, O_RDONLY)) < 0)
{
free(qfpathname);
continue;
}
free(qfpathname);
lseek(fd, (long) dqoff(id), L_SET);
switch (read(fd, &dq_dqb, sizeof(struct dqblk))) {
case 0:/* EOF */
/*
* Convert implicit 0 quota (EOF) into an
* explicit one (zero'ed dqblk)
*/
memset((caddr_t)&dq_dqb, 0, sizeof(struct dqblk));
break;
case sizeof(struct dqblk): /* OK */
break;
default: /* ERROR */
close(fd);
continue;
}
close(fd);
}
endmntent(fp);
if (err && (flags & ACTIVE)) {
result.status = Q_NOQUOTA;
return(&result);
}
result.status = Q_OK;
result.getquota_rslt_u.gqr_rquota.rq_active = (err == 0) ? TRUE : FALSE;
/*
* Make a copy of the info into the last part of the remote quota
* struct which is exactly the same.
*/
memcpy((caddr_t *)&result.getquota_rslt_u.gqr_rquota.rq_bhardlimit,
(caddr_t *)&dq_dqb, sizeof(struct dqblk));
return(&result);
}
}
endmntent(fp);
result.status = Q_NOQUOTA;
return(&result);
}
getquota_rslt *rquotaproc_getquota_1(getquota_args *argp, struct svc_req *rqstp)
{
return(getquotainfo(0, (caddr_t *)argp, rqstp));
}
getquota_rslt *rquotaproc_getactivequota_1(getquota_args *argp, struct svc_req *rqstp)
{
return(getquotainfo(ACTIVE, (caddr_t *)argp, rqstp));
}
getquota_rslt *rquotaproc_getquota_2(ext_getquota_args *argp, struct svc_req *rqstp)
{
return(getquotainfo(TYPE_EXTENDED, (caddr_t *)argp, rqstp));
}
getquota_rslt *rquotaproc_getactivequota_2(ext_getquota_args *argp, struct svc_req *rqstp)
{
return(getquotainfo(TYPE_EXTENDED | ACTIVE, (caddr_t *)argp, rqstp));
}
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