s3:smbd: add a nfs backend for sysquotas.

This module is based on the Solaris/FreeBSD implementation
of NFS quotas in the quotas.c module.

It implements the SMB_USER_QUOTA_TYPE query of the
get_quotas call. The other types and the set_quota call
are not implemented.

1 files changed, 271 insertions, 0 deletions

diff --git a/source3/lib/sysquotas_nfs.c b/source3/lib/sysquotas_nfs.c
new file mode 100644
index 0000000000..8272f53e3c
--- /dev/null
+++ b/source3/lib/sysquotas_nfs.c
@@ -0,0 +1,271 @@
+/* 
+   Unix SMB/CIFS implementation.
+   System QUOTA function wrappers for NFS
+   Copyright (C) Michael Adam 2010
+   
+   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 3 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+
+#include "includes.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_QUOTA
+
+#ifndef HAVE_SYS_QUOTAS
+#ifdef HAVE_NFS_QUOTAS
+#undef HAVE_NFS_QUOTAS
+#endif
+#endif
+
+#ifdef HAVE_NFS_QUOTAS
+
+/*
+ * nfs quota support
+ * This is based on the FreeBSD / SUNOS5 section of quotas.c
+ */
+
+#include <rpc/rpc.h>
+#include <rpc/types.h>
+#include <rpcsvc/rquota.h>
+#ifdef HAVE_RPC_NETTYPE_H
+#include <rpc/nettype.h>
+#endif
+#include <rpc/xdr.h>
+
+static int my_xdr_getquota_args(XDR *xdrsp, struct getquota_args *args)
+{
+	if (!xdr_string(xdrsp, &args->gqa_pathp, RQ_PATHLEN ))
+		return(0);
+	if (!xdr_int(xdrsp, &args->gqa_uid))
+		return(0);
+	return (1);
+}
+
+static int my_xdr_getquota_rslt(XDR *xdrsp, struct getquota_rslt *gqr)
+{
+	int quotastat;
+
+	if (!xdr_int(xdrsp, &quotastat)) {
+		DEBUG(6,("nfs_quotas: Status bad or zero\n"));
+		return 0;
+	}
+	gqr->status = quotastat;
+
+	if (!xdr_int(xdrsp, &gqr->getquota_rslt_u.gqr_rquota.rq_bsize)) {
+		DEBUG(6,("nfs_quotas: Block size bad or zero\n"));
+		return 0;
+	}
+	if (!xdr_bool(xdrsp, &gqr->getquota_rslt_u.gqr_rquota.rq_active)) {
+		DEBUG(6,("nfs_quotas: Active bad or zero\n"));
+		return 0;
+	}
+	if (!xdr_int(xdrsp, (int *)&gqr->getquota_rslt_u.gqr_rquota.rq_bhardlimit)) {
+		DEBUG(6,("nfs_quotas: Hardlimit bad or zero\n"));
+		return 0;
+	}
+	if (!xdr_int(xdrsp, (int *)&gqr->getquota_rslt_u.gqr_rquota.rq_bsoftlimit)) {
+		DEBUG(6,("nfs_quotas: Softlimit bad or zero\n"));
+		return 0;
+	}
+	if (!xdr_int(xdrsp, (int *)&gqr->getquota_rslt_u.gqr_rquota.rq_curblocks)) {
+		DEBUG(6,("nfs_quotas: Currentblocks bad or zero\n"));
+		return 0;
+	}
+	return (1);
+}
+
+
+int sys_get_nfs_quota(const char *path, const char *bdev,
+		      enum SMB_QUOTA_TYPE qtype,
+		      unid_t id, SMB_DISK_QUOTA *dp)
+{
+	CLIENT *clnt;
+	struct getquota_rslt gq_rslt;
+	struct getquota_args gq_args;
+	const char *mnttype;
+	char *cutstr, *pathname, *host, *testpath;
+	int len;
+	static struct timeval timeout = {2,0};
+	enum clnt_stat clnt_stat;
+
+	int ret = -1;
+	uint32 qflags = 0;
+
+	if (!path || !bdev || !dp) {
+		smb_panic("sys_get_nfs_quota: called with NULL pointer");
+	}
+
+	DEBUG(10, ("sys_get_nfs_quota: path[%s] bdev[%s] qtype[%d]\n",
+		   path, bdev, qtype));
+
+	ZERO_STRUCT(*dp);
+
+	dp->qtype = qtype;
+
+	if (qtype != SMB_USER_QUOTA_TYPE) {
+		DEBUG(3, ("sys_get_nfs_quota: got unsupported quota type '%d', "
+			  "only supported type is '%d' (SMB_USER_QUOTA_TYPE)\n",
+			  qtype, SMB_USER_QUOTA_TYPE));
+		errno = ENOSYS;
+		return -1;
+	}
+
+	mnttype = bdev;
+	len = strcspn(mnttype, ":");
+	pathname = strstr(mnttype, ":");
+	cutstr = (char *) SMB_MALLOC(len+1);
+	if (cutstr == NULL) {
+		errno = ENOMEM;
+		return -1;
+	}
+
+	memset(cutstr, '\0', len+1);
+	host = strncat(cutstr, mnttype, sizeof(char) * len);
+	testpath = strchr_m(mnttype, ':');
+	testpath++;
+	gq_args.gqa_pathp = testpath;
+	gq_args.gqa_uid = id.uid;
+
+	DEBUG(10, ("sys_get_nfs_quotas: Asking for quota of path '%s' on "
+		   "host '%s', rpcprog '%i', rpcvers '%i', network '%s'\n",
+		    host, testpath+1, RQUOTAPROG, RQUOTAVERS, "udp"));
+
+	clnt = clnt_create(host, RQUOTAPROG, RQUOTAVERS, "udp");
+	if (clnt == NULL) {
+		ret = -1;
+		goto out;
+	}
+
+	clnt->cl_auth = authunix_create_default();
+	if (clnt->cl_auth == NULL) {
+		DEBUG(3, ("sys_get_nfs_quotas: authunix_create_default "
+			  "failed\n"));
+		ret = -1;
+		goto out;
+	}
+
+	clnt_stat = clnt_call(clnt,
+			      RQUOTAPROC_GETQUOTA,
+			      (const xdrproc_t) my_xdr_getquota_args,
+			      (caddr_t)&gq_args,
+			      (const xdrproc_t) my_xdr_getquota_rslt,
+			      (caddr_t)&gq_rslt,
+			      timeout);
+
+	if (clnt_stat != RPC_SUCCESS) {
+		DEBUG(3, ("sys_get_nfs_quotas: clnt_call failed\n"));
+		ret = -1;
+		goto out;
+	}
+
+	DEBUG(10, ("sys_get_nfs_quotas: getquota_rslt:\n"
+		   "status       : '%i'\n"
+		   "bsize        : '%i'\n"
+		   "active       : '%s'\n"
+		   "bhardlimit   : '%u'\n"
+		   "bsoftlimit   : '%u'\n"
+		   "curblocks    : '%u'\n"
+		   "fhardlimit   : '%u'\n"
+		   "fsoftlimit   : '%u'\n"
+		   "curfiles     : '%u'\n"
+		   "btimeleft    : '%u'\n"
+		   "ftimeleft    : '%u'\n",
+		   gq_rslt.status,
+		   gq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize,
+		   gq_rslt.getquota_rslt_u.gqr_rquota.rq_active?"yes":"no",
+		   gq_rslt.getquota_rslt_u.gqr_rquota.rq_bhardlimit,
+		   gq_rslt.getquota_rslt_u.gqr_rquota.rq_bsoftlimit,
+		   gq_rslt.getquota_rslt_u.gqr_rquota.rq_curblocks,
+		   gq_rslt.getquota_rslt_u.gqr_rquota.rq_fhardlimit,
+		   gq_rslt.getquota_rslt_u.gqr_rquota.rq_fsoftlimit,
+		   gq_rslt.getquota_rslt_u.gqr_rquota.rq_curfiles,
+		   gq_rslt.getquota_rslt_u.gqr_rquota.rq_btimeleft,
+		   gq_rslt.getquota_rslt_u.gqr_rquota.rq_ftimeleft));
+
+	/*
+	 * gqr.status returns
+	 *   0 if the rpc call fails,
+	 *   1 if quotas exist,
+	 *   2 if there is no quota set, and
+	 *   3 if no permission to get the quota.
+	 */
+
+	switch (gq_rslt.status) {
+	case 0:
+		DEBUG(3, ("sys_get_nfs_quotas: Remote Quotas Failed! "
+			  "Error '%i'\n", gq_rslt.status));
+		ret = -1;
+		goto out;
+
+	case 1:
+		DEBUG(10, ("sys_get_nfs_quotas: Good quota data\n"));
+		dp->bsize = (uint64_t)gq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize;
+		dp->softlimit = gq_rslt.getquota_rslt_u.gqr_rquota.rq_bsoftlimit;
+		dp->hardlimit = gq_rslt.getquota_rslt_u.gqr_rquota.rq_bhardlimit;
+		dp->curblocks = gq_rslt.getquota_rslt_u.gqr_rquota.rq_curblocks;
+		break;
+
+	case 2:
+		DEBUG(5, ("sys_get_nfs_quotas: No quota set\n"));
+		SMB_QUOTAS_SET_NO_LIMIT(dp);
+		break;
+
+	case 3:
+		DEBUG(3, ("sys_get_nfs_quotas: no permission to get quota\n"));
+		errno = EPERM;
+		ret = -1;
+		goto out;
+
+	default:
+		DEBUG(5, ("sys_get_nfs_quotas: Unknown remote quota status "
+			  "code '%i'\n", gq_rslt.status));
+		ret = -1;
+		goto out;
+		break;
+	}
+
+	dp->qflags = qflags;
+
+	ret = 0;
+
+out:
+	if (clnt) {
+		if (clnt->cl_auth) {
+			auth_destroy(clnt->cl_auth);
+		}
+		clnt_destroy(clnt);
+	}
+
+	SAFE_FREE(cutstr);
+
+	DEBUG(10, ("sys_get_nfs_quotas: finished\n" ));
+	return ret;
+}
+
+int sys_set_nfs_quota(const char *path, const char *bdev,
+		      enum SMB_QUOTA_TYPE qtype,
+		      unid_t id, SMB_DISK_QUOTA *dp)
+{
+	DEBUG(1, ("sys_set_nfs_quota : not supported\n"));
+	errno = ENOSYS;
+	return -1;
+}
+
+#else /* HAVE_NFS_QUOTAS */
+
+void dummy_sysquotas_nfs(void);
+void dummy_sysquotas_nfs(void) {}
+
+#endif /* HAVE_NFS_QUOTAS */