[PATCH v2 4/4] net: add NFSv1 support

[Christian Gmeiner]

From: Thomas RIENOESSL <thomas.rienoessl at bachmann.info>

NFSv1 support added by Christian Gmeiner, Thomas Rienoessl,
September 27, 2018. As of now, NFSv3 is the default choice.
if the server does not support NFSv3, we fall back to
versions 2 or 1.

Signed-off-by: Thomas RIENOESSL <thomas.rienoessl at bachmann.info>
---
 net/nfs.c | 42 +++++++++++++++++++++++++++++++++---------
 1 file changed, 33 insertions(+), 9 deletions(-)

diff --git a/net/nfs.c b/net/nfs.c
index 21cae52f35..7a8887ef23 100644
--- a/net/nfs.c
+++ b/net/nfs.c
@@ -26,6 +26,10 @@
  * NFSv2 is still used by default. But if server does not support NFSv2, then
  * NFSv3 is used, if available on NFS server. */
 
+/* NOTE 5: NFSv1 support added by Christian Gmeiner, Thomas Rienoessl,
+ * September 27, 2018. As of now, NFSv3 is the default choice. If the server
+ * does not support NFSv3, we fall back to versions 2 or 1. */
+
 #include <common.h>
 #include <command.h>
 #include <display_options.h>
@@ -78,6 +82,7 @@ static char nfs_path_buff[2048];
 
 enum nfs_version {
 	NFS_UNKOWN = 0,
+	NFS_V1 = 1,
 	NFS_V2 = 2,
 	NFS_V3 = 3,
 };
@@ -192,6 +197,7 @@ static void rpc_req(int rpc_prog, int rpc_proc, uint32_t *data, int datalen)
 	switch (rpc_prog) {
 	case PROG_NFS:
 		switch (choosen_nfs_version) {
+		case NFS_V1:
 		case NFS_V2:
 			rpc_pkt.u.call.vers = htonl(2);
 			break;
@@ -205,8 +211,26 @@ static void rpc_req(int rpc_prog, int rpc_proc, uint32_t *data, int datalen)
 			break;
 		}
 		break;
-	case PROG_PORTMAP:
 	case PROG_MOUNT:
+		switch (choosen_nfs_version) {
+		case NFS_V1:
+			rpc_pkt.u.call.vers = htonl(1);
+			break;
+
+		case NFS_V2:
+			rpc_pkt.u.call.vers = htonl(2);
+			break;
+
+		case NFS_V3:
+			rpc_pkt.u.call.vers = htonl(3);
+			break;
+
+		case NFS_UNKOWN:
+			/* nothing to do */
+			break;
+		}
+		break;
+	case PROG_PORTMAP:
 	default:
 		rpc_pkt.u.call.vers = htonl(2);	/* portmapper is version 2 */
 	}
@@ -311,7 +335,7 @@ static void nfs_readlink_req(void)
 	p = &(data[0]);
 	p = rpc_add_credentials(p);
 
-	if (choosen_nfs_version == NFS_V2) {
+	if (choosen_nfs_version != NFS_V3) {
 		memcpy(p, filefh, NFS_FHSIZE);
 		p += (NFS_FHSIZE / 4);
 	} else { /* NFS_V3 */
@@ -340,7 +364,7 @@ static void nfs_lookup_req(char *fname)
 	p = &(data[0]);
 	p = rpc_add_credentials(p);
 
-	if (choosen_nfs_version == NFS_V2) {
+	if (choosen_nfs_version != NFS_V3) {
 		memcpy(p, dirfh, NFS_FHSIZE);
 		p += (NFS_FHSIZE / 4);
 		*p++ = htonl(fnamelen);
@@ -380,7 +404,7 @@ static void nfs_read_req(int offset, int readlen)
 	p = &(data[0]);
 	p = rpc_add_credentials(p);
 
-	if (choosen_nfs_version == NFS_V2) {
+	if (choosen_nfs_version != NFS_V3) {
 		memcpy(p, filefh, NFS_FHSIZE);
 		p += (NFS_FHSIZE / 4);
 		*p++ = htonl(offset);
@@ -410,13 +434,13 @@ static void nfs_send(void)
 
 	switch (nfs_state) {
 	case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
-		if (choosen_nfs_version == NFS_V2)
+		if (choosen_nfs_version != NFS_V3)
 			rpc_lookup_req(PROG_MOUNT, 1);
 		else  /* NFS_V3 */
 			rpc_lookup_req(PROG_MOUNT, 3);
 		break;
 	case STATE_PRCLOOKUP_PROG_NFS_REQ:
-		if (choosen_nfs_version == NFS_V2)
+		if (choosen_nfs_version != NFS_V3)
 			rpc_lookup_req(PROG_NFS, 2);
 		else  /* NFS_V3 */
 			rpc_lookup_req(PROG_NFS, 3);
@@ -457,7 +481,7 @@ static int rpc_handle_error(struct rpc_t *rpc_pkt)
 			const int min = ntohl(rpc_pkt->u.reply.data[0]);
 			const int max = ntohl(rpc_pkt->u.reply.data[1]);
 
-			if (max < NFS_V2 || max > NFS_V3 || min > NFS_V3) {
+			if (max < NFS_V1 || max > NFS_V3 || min > NFS_V3) {
 				puts("*** ERROR: NFS version not supported");
 				debug(": Requested: V%d, accepted: min V%d - max V%d\n",
 				      choosen_nfs_version,
@@ -588,7 +612,7 @@ static int nfs_lookup_reply(uchar *pkt, unsigned len)
 	if (ret)
 		return ret;
 
-	if (choosen_nfs_version == NFS_V2) {
+	if (choosen_nfs_version != NFS_V3) {
 		if (((uchar *)&(rpc_pkt.u.reply.data[0]) - (uchar *)(&rpc_pkt) + NFS_FHSIZE) > len)
 			return -NFS_RPC_DROP;
 		memcpy(filefh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
@@ -712,7 +736,7 @@ static int nfs_read_reply(uchar *pkt, unsigned len)
 	if (!(nfs_offset % ((NFS_READ_SIZE / 2) * 10)))
 		putc('#');
 
-	if (choosen_nfs_version == NFS_V2) {
+	if (choosen_nfs_version != NFS_V3) {
 		rlen = ntohl(rpc_pkt.u.reply.data[18]);
 		data_ptr = (uchar *)&(rpc_pkt.u.reply.data[19]);
 	} else {  /* NFS_V3 */
-- 
2.39.2