/**************************************************************************** * fs/nfs/rpc_clnt.c * * Copyright (C) 2012-2013, 2018 Gregory Nutt. All rights reserved. * Copyright (C) 2012 Jose Pablo Rojas Vargas. All rights reserved. * Author: Jose Pablo Rojas Vargas * Gregory Nutt * * Leveraged from OpenBSD: * * Copyright (c) 2004 The Regents of the University of Michigan. * All rights reserved. * * Copyright (c) 2004 Weston Andros Adamson . * Copyright (c) 2004 Marius Aamodt Eriksen . * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * Copyright (c) 1989, 1991, 1993, 1995 The Regents of the University of * California. All rights reserved. * * This code is derived from software contributed to Berkeley by Rick Macklem * at The University of Guelph. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. 2. * Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. 3. All advertising * materials mentioning features or use of this software must display the * following acknowledgement: This product includes software developed by the * University of California, Berkeley and its contributors. 4. Neither the * name of the University nor the names of its contributors may be used to * endorse or promote products derived from this software without specific * prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include #include "xdr_subs.h" #include "nfs_proto.h" #include "rpc.h" /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* Increment RPC statistics */ #ifdef CONFIG_NFS_STATISTICS # define rpc_statistics(n) do { rpcstats.n++; } while (0) #else # define rpc_statistics(n) #endif /**************************************************************************** * Private Types ****************************************************************************/ /* Global RPC statistics */ #ifdef CONFIG_NFS_STATISTICS struct rpcstats { int rpcretries; int rpcrequests; int rpctimeouts; int rpcinvalid; }; #endif /**************************************************************************** * Private Data ****************************************************************************/ /* Static data, mostly RPC constants in XDR form */ static uint32_t rpc_reply; static uint32_t rpc_call; static uint32_t rpc_vers; static uint32_t rpc_auth_null; static uint32_t rpc_auth_unix; /* Global statics for all client instances. Cleared by NuttX on boot-up. */ #ifdef CONFIG_NFS_STATISTICS static struct rpcstats rpcstats; #endif /**************************************************************************** * Private Function Prototypes ****************************************************************************/ static int rpcclnt_socket(FAR struct rpcclnt *rpc, in_port_t rport); static int rpcclnt_send(FAR struct rpcclnt *rpc, FAR void *call, int reqlen); static int rpcclnt_receive(FAR struct rpcclnt *rpc, FAR void *reply, size_t resplen); static int rpcclnt_reply(FAR struct rpcclnt *rpc, uint32_t xid, FAR void *reply, size_t resplen); static void rpcclnt_fmtheader(FAR struct rpc_call_header *ch, uint32_t xid, int procid, int prog, int vers); /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: rpcclnt_socket * * Description: * Close(old), create, bind and connect the socket. * * Returned Value: * Returns zero on success or a (negative) errno value on failure. * ****************************************************************************/ static int rpcclnt_socket(FAR struct rpcclnt *rpc, in_port_t rport) { struct sockaddr_storage raddr; struct sockaddr_storage laddr; FAR in_port_t *lport; in_port_t port = 1024; struct timeval tv; socklen_t addrlen; int error; /* Close the old socket */ psock_close(&rpc->rc_so); /* Prepare the socket address */ memcpy(&raddr, rpc->rc_name, sizeof(raddr)); laddr.ss_family = raddr.ss_family; memset(laddr.ss_data, 0, sizeof(laddr.ss_data)); if (raddr.ss_family == AF_INET6) { FAR struct sockaddr_in6 *sin; addrlen = sizeof(struct sockaddr_in6); if (rport != 0) { sin = (FAR struct sockaddr_in6 *)&raddr; sin->sin6_port = HTONS(rport); } sin = (FAR struct sockaddr_in6 *)&laddr; lport = &sin->sin6_port; } else { FAR struct sockaddr_in *sin; addrlen = sizeof(struct sockaddr_in); if (rport != 0) { sin = (FAR struct sockaddr_in *)&raddr; sin->sin_port = HTONS(rport); } sin = (FAR struct sockaddr_in *)&laddr; lport = &sin->sin_port; } /* Create the socket */ error = psock_socket(raddr.ss_family, rpc->rc_sotype, 0, &rpc->rc_so); if (error < 0) { ferr("ERROR: psock_socket failed: %d", error); return error; } /* Always set receive timeout to detect server crash and reconnect. * Otherwise, we can get stuck in psock_receive forever. */ tv.tv_sec = rpc->rc_timeo / 10; tv.tv_usec = (rpc->rc_timeo % 10) * 100000; error = psock_setsockopt(&rpc->rc_so, SOL_SOCKET, SO_RCVTIMEO, (FAR const void *)&tv, sizeof(tv)); if (error < 0) { ferr("ERROR: psock_setsockopt failed: %d\n", error); goto bad; } if (rpc->rc_sotype == SOCK_DGRAM) { /* Some servers require that the client port be a reserved port * number. We always allocate a reserved port, as this prevents * filehandle disclosure through UDP port capture. */ do { *lport = htons(--port); error = psock_bind(&rpc->rc_so, (FAR struct sockaddr *)&laddr, addrlen); if (error < 0) { ferr("ERROR: psock_bind failed: %d\n", error); } } while (error == -EADDRINUSE && port >= 512); if (error) { ferr("ERROR: psock_bind failed: %d\n", error); goto bad; } } /* Protocols that do not require connections could be optionally left * unconnected. That would allow servers to reply from a port other than * the NFS_PORT. */ error = psock_connect(&rpc->rc_so, (FAR struct sockaddr *)&raddr, addrlen); if (error < 0) { ferr("ERROR: psock_connect to PMAP port failed: %d", error); goto bad; } return OK; bad: psock_close(&rpc->rc_so); return error; } /**************************************************************************** * Name: rpcclnt_send * * Description: * This is the nfs send routine. * * Returned Value: * Returns zero on success or a (negative) errno value on failure. * ****************************************************************************/ static int rpcclnt_send(FAR struct rpcclnt *rpc, FAR void *call, int reqlen) { struct iovec iov[2]; struct msghdr msg; uint32_t mark; int ret = OK; if (rpc->rc_sotype == SOCK_STREAM) { /* Prepare the record marking(RM) and compose an RPC request * NOTE: Sending a separate packet does not work with Linux host */ mark = txdr_unsigned(0x80000000 | (reqlen)); iov[0].iov_base = (FAR void *)&mark; iov[0].iov_len = sizeof(mark); iov[1].iov_base = (FAR void *)call; iov[1].iov_len = reqlen; msg.msg_name = NULL; msg.msg_namelen = 0; msg.msg_iov = iov; msg.msg_iovlen = 2; msg.msg_control = NULL; msg.msg_controllen = 0; msg.msg_flags = 0; ret = psock_sendmsg(&rpc->rc_so, &msg, 0); ferr("ERROR: psock_sendmsg request failed: %d\n", ret); } else { /* Send the call message * * On success, psock_send returns the number of bytes sent; * On failure, it returns a negated errno value. */ ret = psock_send(&rpc->rc_so, call, reqlen, 0); ferr("ERROR: psock_send request failed: %d\n", ret); } if (ret < 0) { return ret; } return OK; } /**************************************************************************** * Name: rpcclnt_receive * * Description: * Receive a Sun RPC Request/Reply. * ****************************************************************************/ static int rpcclnt_receive(FAR struct rpcclnt *rpc, FAR void *reply, size_t resplen) { uint32_t mark; int error = 0; int offset = 0; /* Receive the record marking(RM) for stream only */ if (rpc->rc_sotype == SOCK_STREAM) { error = psock_recv(&rpc->rc_so, &mark, sizeof(mark), 0); if (error < 0) { ferr("ERROR: psock_recv mark failed: %d\n", error); return error; } /* Limit the receive length to the marked value */ mark = fxdr_unsigned(uint32_t, mark); if (!(mark & 0x80000000)) { return -ENOSYS; } mark &= 0x7fffffff; if (mark > resplen) { return -E2BIG; } resplen = mark; } do { error = psock_recv(&rpc->rc_so, reply + offset, resplen, 0); if (error < 0) { ferr("ERROR: psock_recv response failed: %d\n", error); return error; } resplen -= error; offset += error; } while (rpc->rc_sotype == SOCK_STREAM && resplen != 0); return OK; } /**************************************************************************** * Name: rpcclnt_reply * * Description: * Received the RPC reply on the socket. * ****************************************************************************/ static int rpcclnt_reply(FAR struct rpcclnt *rpc, uint32_t xid, FAR void *reply, size_t resplen) { int error; retry: /* Get the next RPC reply from the socket */ error = rpcclnt_receive(rpc, reply, resplen); if (error != 0) { ferr("ERROR: rpcclnt_receive returned: %d\n", error); } /* Get the xid and check that it is an RPC replysvr */ else { FAR struct rpc_reply_header *replyheader = (FAR struct rpc_reply_header *)reply; if (replyheader->rp_direction != rpc_reply) { ferr("ERROR: Different RPC REPLY returned\n"); rpc_statistics(rpcinvalid); error = -EPROTO; } else if (replyheader->rp_xid != txdr_unsigned(xid)) { ferr("ERROR: Different RPC XID returned\n"); rpc_statistics(rpcinvalid); goto retry; } } return error; } /**************************************************************************** * Name: rpcclnt_fmtheader * * Description: * Format the common part of the call header * ****************************************************************************/ static void rpcclnt_fmtheader(FAR struct rpc_call_header *ch, uint32_t xid, int prog, int vers, int procid) { /* Format the call header */ ch->rp_xid = txdr_unsigned(xid); ch->rp_direction = rpc_call; ch->rp_rpcvers = rpc_vers; ch->rp_prog = txdr_unsigned(prog); ch->rp_vers = txdr_unsigned(vers); ch->rp_proc = txdr_unsigned(procid); /* rpc_auth part (auth_unix) */ ch->rpc_auth.authtype = rpc_auth_unix; ch->rpc_auth.authlen = txdr_unsigned(sizeof(ch->rpc_unix)); ch->rpc_unix.stamp = 0; ch->rpc_unix.hostname = 0; ch->rpc_unix.uid = 0; ch->rpc_unix.gid = 0; ch->rpc_unix.gidlist = 0; /* rpc_verf part (auth_null) */ ch->rpc_verf.authtype = rpc_auth_null; ch->rpc_verf.authlen = 0; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: rpcclnt_init * * Description: * Initialize the RPC client * ****************************************************************************/ void rpcclnt_init(void) { /* RPC constants how about actually using more than one of these! */ rpc_reply = txdr_unsigned(RPC_REPLY); rpc_vers = txdr_unsigned(RPC_VER2); rpc_call = txdr_unsigned(RPC_CALL); rpc_auth_null = txdr_unsigned(RPCAUTH_NULL); rpc_auth_unix = txdr_unsigned(RPCAUTH_UNIX); finfo("RPC initialized\n"); } /**************************************************************************** * Name: rpcclnt_connect * * Description: * Initialize sockets for a new RPC connection. We do not free the * sockaddr if an error occurs. * ****************************************************************************/ int rpcclnt_connect(FAR struct rpcclnt *rpc) { int error; int prot; union { struct rpc_call_pmap sdata; struct rpc_call_mount mountd; } request; union { struct rpc_reply_pmap rdata; struct rpc_reply_mount mdata; } response; finfo("Connecting\n"); /* Create the socket */ error = rpcclnt_socket(rpc, 0); if (error < 0) { ferr("ERROR: rpcclnt_socket failed: %d", error); return error; } prot = rpc->rc_sotype == SOCK_DGRAM ? IPPROTO_UDP : IPPROTO_TCP; /* Do the RPC to get a dynamic bounding with the server using ppmap. * Get port number for MOUNTD. */ request.sdata.pmap.prog = txdr_unsigned(RPCPROG_MNT); request.sdata.pmap.vers = txdr_unsigned(RPCMNT_VER3); request.sdata.pmap.prot = txdr_unsigned(prot); request.sdata.pmap.port = 0; error = rpcclnt_request(rpc, PMAPPROC_GETPORT, PMAPPROG, PMAPVERS, (FAR void *)&request.sdata, sizeof(struct call_args_pmap), (FAR void *)&response.rdata, sizeof(struct rpc_reply_pmap)); if (error != 0) { ferr("ERROR: rpcclnt_request failed: %d\n", error); goto bad; } error = rpcclnt_socket(rpc, fxdr_unsigned(uint32_t, response.rdata.pmap.port)); if (error < 0) { ferr("ERROR: rpcclnt_socket MOUNTD port failed: %d\n", error); goto bad; } /* Do RPC to mountd. */ strlcpy(request.mountd.mount.rpath, rpc->rc_path, sizeof(request.mountd.mount.rpath)); request.mountd.mount.len = txdr_unsigned(sizeof(request.mountd.mount.rpath)); error = rpcclnt_request(rpc, RPCMNT_MOUNT, RPCPROG_MNT, RPCMNT_VER3, (FAR void *)&request.mountd, sizeof(struct call_args_mount), (FAR void *)&response.mdata, sizeof(struct rpc_reply_mount)); if (error != 0) { ferr("ERROR: rpcclnt_request failed: %d\n", error); goto bad; } error = -fxdr_unsigned(uint32_t, response.mdata.mount.status); if (error != 0) { ferr("ERROR: Bad mount status: %d\n", error); goto bad; } rpc->rc_fhsize = fxdr_unsigned(uint32_t, response.mdata.mount.fhandle.length); memcpy(&rpc->rc_fh, &response.mdata.mount.fhandle.handle, rpc->rc_fhsize); /* Do the RPC to get a dynamic bounding with the server using PMAP. * NFS port in the socket. */ error = rpcclnt_socket(rpc, 0); if (error < 0) { ferr("ERROR: rpcclnt_socket PMAP port failed: %d\n", error); goto bad; } request.sdata.pmap.prog = txdr_unsigned(NFS_PROG); request.sdata.pmap.vers = txdr_unsigned(NFS_VER3); request.sdata.pmap.prot = txdr_unsigned(prot); request.sdata.pmap.port = 0; error = rpcclnt_request(rpc, PMAPPROC_GETPORT, PMAPPROG, PMAPVERS, (FAR void *)&request.sdata, sizeof(struct call_args_pmap), (FAR void *)&response.rdata, sizeof(struct rpc_reply_pmap)); if (error != 0) { ferr("ERROR: rpcclnt_request failed: %d\n", error); goto bad; } error = rpcclnt_socket(rpc, fxdr_unsigned(uint32_t, response.rdata.pmap.port)); if (error < 0) { ferr("ERROR: rpcclnt_socket NFS port returns %d\n", error); goto bad; } return OK; bad: psock_close(&rpc->rc_so); return error; } /**************************************************************************** * Name: rpcclnt_disconnect * * Description: * Disconnect from the NFS server. * ****************************************************************************/ void rpcclnt_disconnect(FAR struct rpcclnt *rpc) { union { struct rpc_call_pmap sdata; struct rpc_call_umount mountd; } request; union { struct rpc_reply_pmap rdata; struct rpc_reply_umount mdata; } response; int error; int prot; error = rpcclnt_socket(rpc, 0); if (error < 0) { ferr("ERROR: rpcclnt_socket failed: %d\n", error); goto bad; } prot = rpc->rc_sotype == SOCK_DGRAM ? IPPROTO_UDP : IPPROTO_TCP; request.sdata.pmap.prog = txdr_unsigned(RPCPROG_MNT); request.sdata.pmap.vers = txdr_unsigned(RPCMNT_VER3); request.sdata.pmap.prot = txdr_unsigned(prot); request.sdata.pmap.port = 0; error = rpcclnt_request(rpc, PMAPPROC_GETPORT, PMAPPROG, PMAPVERS, (FAR void *)&request.sdata, sizeof(struct call_args_pmap), (FAR void *)&response.rdata, sizeof(struct rpc_reply_pmap)); if (error != 0) { ferr("ERROR: rpcclnt_request failed: %d\n", error); goto bad; } error = rpcclnt_socket(rpc, fxdr_unsigned(uint32_t, response.rdata.pmap.port)); if (error < 0) { ferr("ERROR: rpcclnt_socket failed: %d\n", error); goto bad; } /* Do RPC to umountd. */ strlcpy(request.mountd.umount.rpath, rpc->rc_path, sizeof(request.mountd.umount.rpath)); request.mountd.umount.len = txdr_unsigned(sizeof(request.mountd.umount.rpath)); error = rpcclnt_request(rpc, RPCMNT_UMOUNT, RPCPROG_MNT, RPCMNT_VER3, (FAR void *)&request.mountd, sizeof(struct call_args_umount), (FAR void *)&response.mdata, sizeof(struct rpc_reply_umount)); if (error != 0) { ferr("ERROR: rpcclnt_request failed: %d\n", error); goto bad; } bad: psock_close(&rpc->rc_so); } /**************************************************************************** * Name: rpcclnt_request * * Description: * Perform the RPC request. Logic formats the RPC CALL message and calls * rpcclnt_send to send the RPC CALL message. It then calls * rpcclnt_reply() to get the response. It may attempt to re-send the * CALL message on certain errors. * * On successful receipt, it verifies the RPC level of the returned values. * (There may still be be NFS layer errors that will be detected by calling * logic). * ****************************************************************************/ int rpcclnt_request(FAR struct rpcclnt *rpc, int procnum, int prog, int version, FAR void *request, size_t reqlen, FAR void *response, size_t resplen) { FAR struct rpc_reply_header *replymsg; uint32_t tmp; uint32_t xid; int retries = 0; int error = 0; /* Get a new (non-zero) xid */ xid = ++rpc->rc_xid; /* Initialize the RPC header fields */ rpcclnt_fmtheader((FAR struct rpc_call_header *)request, xid, prog, version, procnum); /* Get the full size of the message (the size of variable data plus the * size of the messages header). */ reqlen += sizeof(struct rpc_call_header); /* Send the RPC call messages and receive the RPC response. A limited * number of re-tries will be attempted, but only for the case of response * timeouts. */ for (; ; ) { /* Do the client side RPC. */ rpc_statistics(rpcrequests); /* Send the RPC CALL message */ error = rpcclnt_send(rpc, request, reqlen); if (error != OK) { finfo("ERROR rpcclnt_send failed: %d\n", error); } /* Wait for the reply from our send */ else { error = rpcclnt_reply(rpc, xid, response, resplen); if (error != OK) { finfo("ERROR rpcclnt_reply failed: %d\n", error); } } /* If we failed because of a timeout, then try sending the CALL * message again. */ if (error != -EAGAIN && error != -ETIMEDOUT) { break; } rpc_statistics(rpctimeouts); if (++retries >= rpc->rc_retry) { break; } rpc_statistics(rpcretries); } if (error != OK) { ferr("ERROR: RPC failed: %d\n", error); return error; } /* Break down the RPC header and check if it is OK */ replymsg = (FAR struct rpc_reply_header *)response; tmp = fxdr_unsigned(uint32_t, replymsg->type); if (tmp != RPC_MSGACCEPTED) { return -EOPNOTSUPP; } tmp = fxdr_unsigned(uint32_t, replymsg->status); if (tmp == RPC_SUCCESS) { finfo("RPC_SUCCESS\n"); } else { ferr("ERROR: Unsupported RPC type: %" PRId32 "\n", tmp); return -EOPNOTSUPP; } return OK; }