Simplified NFS proxy based on own NFS/XDR implementation

2022-05-07 01:01:20 +03:00
parent a2189100dd
commit 7c2379d458
34 changed files with 10868 additions and 11 deletions
@@ -0,0 +1,113 @@
+/* Based on RFC 5531 - RPC: Remote Procedure Call Protocol Specification Version 2 */
+
+const RPC_MSG_VERSION = 2;
+
+enum rpc_auth_flavor {
+	RPC_AUTH_NONE  = 0,
+	RPC_AUTH_SYS   = 1,
+	RPC_AUTH_SHORT = 2,
+	RPC_AUTH_DH    = 3,
+	RPC_RPCSEC_GSS = 6
+};
+
+enum rpc_msg_type {
+	RPC_CALL  = 0,
+	RPC_REPLY = 1
+};
+
+enum rpc_reply_stat {
+	RPC_MSG_ACCEPTED = 0,
+	RPC_MSG_DENIED   = 1
+};
+
+enum rpc_accept_stat {
+	RPC_SUCCESS       = 0,
+	RPC_PROG_UNAVAIL  = 1,
+	RPC_PROG_MISMATCH = 2,
+	RPC_PROC_UNAVAIL  = 3,
+	RPC_GARBAGE_ARGS  = 4,
+	RPC_SYSTEM_ERR    = 5
+};
+
+enum rpc_reject_stat {
+	RPC_MISMATCH   = 0,
+	RPC_AUTH_ERROR = 1
+};
+
+enum rpc_auth_stat {
+	RPC_AUTH_OK = 0,
+	/*
+	 * failed at remote end
+	 */
+	RPC_AUTH_BADCRED      = 1, /* bogus credentials (seal broken) */
+	RPC_AUTH_REJECTEDCRED = 2, /* client should begin new session */
+	RPC_AUTH_BADVERF      = 3, /* bogus verifier (seal broken) */
+	RPC_AUTH_REJECTEDVERF = 4, /* verifier expired or was replayed */
+	RPC_AUTH_TOOWEAK      = 5, /* rejected due to security reasons */
+	/*
+	 * failed locally
+	 */
+	RPC_AUTH_INVALIDRESP  = 6, /* bogus response verifier */
+	RPC_AUTH_FAILED       = 7  /* some unknown reason */
+};
+
+struct rpc_opaque_auth {
+	rpc_auth_flavor flavor;
+	opaque body<400>;
+};
+
+struct rpc_call_body {
+	u_int rpcvers;
+	u_int prog;
+	u_int vers;
+	u_int proc;
+	rpc_opaque_auth cred;
+	rpc_opaque_auth verf;
+	/* procedure-specific parameters start here */
+};
+
+struct rpc_mismatch_info {
+	unsigned int min_version;
+	unsigned int max_version;
+};
+
+union rpc_accepted_reply_body switch (rpc_accept_stat stat) {
+case RPC_SUCCESS:
+	void;
+	/* procedure-specific results start here */
+case RPC_PROG_MISMATCH:
+	rpc_mismatch_info mismatch_info;
+default:
+	void;
+};
+
+struct rpc_accepted_reply {
+	rpc_opaque_auth verf;
+	rpc_accepted_reply_body reply_data;
+};
+
+union rpc_rejected_reply switch (rpc_reject_stat stat) {
+case RPC_MISMATCH:
+	rpc_mismatch_info mismatch_info;
+case RPC_AUTH_ERROR:
+	rpc_auth_stat auth_stat;
+};
+
+union rpc_reply_body switch (rpc_reply_stat stat) {
+case RPC_MSG_ACCEPTED:
+	rpc_accepted_reply areply;
+case RPC_MSG_DENIED:
+	rpc_rejected_reply rreply;
+};
+
+union rpc_msg_body switch (rpc_msg_type dir) {
+case RPC_CALL:
+	rpc_call_body cbody;
+case RPC_REPLY:
+	rpc_reply_body rbody;
+};
+
+struct rpc_msg {
+	u_int xid;
+	rpc_msg_body body;
+};