s3:smbd: add nfs quota support to the linux-non-sysquota code

This is based on the implementation for solaris and FreeBSD.
It makes rpc calls out to the nfs server to retrieve quota
information.

1 files changed, 198 insertions, 0 deletions

diff --git a/source3/smbd/quotas.c b/source3/smbd/quotas.c
index 1ad2b937b13..ad3973f754e 100644
--- a/source3/smbd/quotas.c
+++ b/source3/smbd/quotas.c
@@ -73,6 +73,197 @@ typedef struct _LINUX_SMB_DISK_QUOTA {
 } LINUX_SMB_DISK_QUOTA;
 
 
+/*
+ * nfs quota support
+ * (essentially taken from FreeBSD / SUNOS5 section)
+ */
+#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;
+}
+
+static bool nfs_quotas(char *nfspath, uid_t euser_id, uint64_t *bsize,
+		       uint64_t *dfree, uint64_t *dsize)
+{
+	uid_t uid = euser_id;
+	LINUX_SMB_DISK_QUOTA D;
+	char *mnttype = nfspath;
+	CLIENT *clnt;
+	struct getquota_rslt gqr;
+	struct getquota_args args;
+	char *cutstr, *pathname, *host, *testpath;
+	int len;
+	static struct timeval timeout = {2,0};
+	enum clnt_stat clnt_stat;
+	bool ret = True;
+
+	*bsize = *dfree = *dsize = (uint64_t)0;
+
+	len=strcspn(mnttype, ":");
+	pathname=strstr(mnttype, ":");
+	cutstr = (char *) SMB_MALLOC(len+1);
+	if (!cutstr)
+		return False;
+
+	memset(cutstr, '\0', len+1);
+	host = strncat(cutstr,mnttype, sizeof(char) * len );
+	DEBUG(5,("nfs_quotas: looking for mount on \"%s\"\n", cutstr));
+	DEBUG(5,("nfs_quotas: of path \"%s\"\n", mnttype));
+	testpath=strchr_m(mnttype, ':');
+	args.gqa_pathp = testpath+1;
+	args.gqa_uid = uid;
+
+	DEBUG(5, ("nfs_quotas: Asking for host \"%s\" rpcprog \"%i\" rpcvers "
+		  "\"%i\" network \"%s\"\n", host, RQUOTAPROG, RQUOTAVERS,
+		  "udp"));
+
+	if ((clnt = clnt_create(host, RQUOTAPROG, RQUOTAVERS, "udp")) == NULL) {
+		ret = False;
+		goto out;
+	}
+
+	clnt->cl_auth = authunix_create_default();
+	DEBUG(9,("nfs_quotas: auth_success\n"));
+
+	clnt_stat=clnt_call(clnt,
+			    RQUOTAPROC_GETQUOTA,
+			    (const xdrproc_t)my_xdr_getquota_args,
+			    (caddr_t)&args,
+			    (const xdrproc_t)my_xdr_getquota_rslt,
+			    (caddr_t)&gqr, timeout);
+
+	if (clnt_stat != RPC_SUCCESS) {
+		DEBUG(9,("nfs_quotas: clnt_call fail\n"));
+		ret = False;
+		goto out;
+	}
+
+	/*
+	 * 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.  If 0 or 3 return
+	 * something sensible.
+	 */
+
+	switch (gqr.status) {
+	case 0:
+		DEBUG(9, ("nfs_quotas: Remote Quotas Failed!  Error \"%i\" \n",
+			  gqr.status));
+		ret = False;
+		goto out;
+
+	case 1:
+		DEBUG(9,("nfs_quotas: Good quota data\n"));
+		D.softlimit = gqr.getquota_rslt_u.gqr_rquota.rq_bsoftlimit;
+		D.hardlimit = gqr.getquota_rslt_u.gqr_rquota.rq_bhardlimit;
+		D.curblocks = gqr.getquota_rslt_u.gqr_rquota.rq_curblocks;
+		break;
+
+	case 2:
+	case 3:
+		D.softlimit = 1;
+		D.curblocks = 1;
+		DEBUG(9, ("nfs_quotas: Remote Quotas returned \"%i\" \n",
+			  gqr.status));
+		break;
+
+	default:
+		DEBUG(9, ("nfs_quotas: Remote Quotas Questionable!  "
+			  "Error \"%i\" \n", gqr.status));
+		break;
+	}
+
+	DEBUG(10, ("nfs_quotas: Let`s look at D a bit closer... "
+		   "status \"%i\" bsize \"%i\" active? \"%i\" bhard "
+		   "\"%i\" bsoft \"%i\" curb \"%i\" \n",
+		   gqr.status,
+		   gqr.getquota_rslt_u.gqr_rquota.rq_bsize,
+		   gqr.getquota_rslt_u.gqr_rquota.rq_active,
+		   gqr.getquota_rslt_u.gqr_rquota.rq_bhardlimit,
+		   gqr.getquota_rslt_u.gqr_rquota.rq_bsoftlimit,
+		   gqr.getquota_rslt_u.gqr_rquota.rq_curblocks));
+
+	if (D.softlimit == 0)
+		D.softlimit = D.hardlimit;
+	if (D.softlimit == 0)
+		return False;
+
+	*bsize = gqr.getquota_rslt_u.gqr_rquota.rq_bsize;
+	*dsize = D.softlimit;
+
+	if (D.curblocks == 1)
+		*bsize = DEV_BSIZE;
+
+	if (D.curblocks > D.softlimit) {
+		*dfree = 0;
+		*dsize = D.curblocks;
+	} else
+		*dfree = D.softlimit - D.curblocks;
+
+  out:
+
+	if (clnt) {
+		if (clnt->cl_auth)
+			auth_destroy(clnt->cl_auth);
+		clnt_destroy(clnt);
+	}
+
+	DEBUG(5, ("nfs_quotas: For path \"%s\" returning "
+		  "bsize %.0f, dfree %.0f, dsize %.0f\n",
+		  args.gqa_pathp, (double)*bsize, (double)*dfree,
+		  (double)*dsize));
+
+	SAFE_FREE(cutstr);
+	DEBUG(10,("nfs_quotas: End of nfs_quotas\n" ));
+	return ret;
+}
+
+/* end of nfs quota section */
+
 #ifdef HAVE_LINUX_DQBLK_XFS_H
 #include <linux/dqblk_xfs.h>
 
@@ -251,6 +442,13 @@ bool disk_quotas(const char *path, uint64_t *bsize, uint64_t *dfree, uint64_t *d
 
 	become_root();
 
+	if (strcmp(mnt->mnt_type, "nfs") == 0) {
+		bool retval;
+		retval = nfs_quotas(mnt->mnt_fsname , euser_id, bsize, dfree, dsize);
+		unbecome_root();
+		return retval;
+	}
+
 	if (strcmp(mnt->mnt_type, "xfs")==0) {
 		r=get_smb_linux_xfs_quota(mnt->mnt_fsname, euser_id, egrp_id, &D);
 	} else {