X-Git-Url: https://git.decadent.org.uk/gitweb/?p=nfs-utils.git;a=blobdiff_plain;f=utils%2Fmount%2Fnetwork.c;h=11c71623aa3b1a0f4ce1030ebae0144762e0bde1;hp=d8e6e103c762d0eea573f4dd4bd0b46d007173ea;hb=c51c20dfa8a81a5d512defcbbf1b7adec3adc591;hpb=abb44f59bd004112a217011a2560dd7c7f94b5a2

diff --git a/utils/mount/network.c b/utils/mount/network.c
index d8e6e10..11c7162 100644
--- a/utils/mount/network.c
+++ b/utils/mount/network.c
@@ -36,6 +36,7 @@
 
 #include <sys/types.h>
 #include <sys/socket.h>
+#include <sys/wait.h>
 #include <netinet/in.h>
 #include <rpc/rpc.h>
 #include <rpc/pmap_prot.h>
@@ -46,19 +47,10 @@
 #include "nls.h"
 #include "nfs_mount.h"
 #include "mount_constants.h"
+#include "nfsrpc.h"
+#include "parse_opt.h"
 #include "network.h"
 
-#ifdef HAVE_RPCSVC_NFS_PROT_H
-#include <rpcsvc/nfs_prot.h>
-#else
-#include <linux/nfs.h>
-#define nfsstat nfs_stat
-#endif
-
-#ifndef NFS_PORT
-#define NFS_PORT 2049
-#endif
-
 #define PMAP_TIMEOUT	(10)
 #define CONNECT_TIMEOUT	(20)
 #define MOUNT_TIMEOUT	(30)
@@ -71,6 +63,38 @@ extern int nfs_mount_data_version;
 extern char *progname;
 extern int verbose;
 
+static const char *nfs_ns_pgmtbl[] = {
+	"status",
+	NULL,
+};
+
+static const char *nfs_mnt_pgmtbl[] = {
+	"mount",
+	"mountd",
+	NULL,
+};
+
+static const char *nfs_nfs_pgmtbl[] = {
+	"nfs",
+	"nfsprog",
+	NULL,
+};
+
+static const char *nfs_transport_opttbl[] = {
+	"udp",
+	"tcp",
+	"proto",
+	NULL,
+};
+
+static const char *nfs_version_opttbl[] = {
+	"v2",
+	"v3",
+	"vers",
+	"nfsvers",
+	NULL,
+};
+
 static const unsigned long nfs_to_mnt[] = {
 	0,
 	0,
@@ -146,37 +170,32 @@ static const unsigned long probe_mnt3_first[] = {
 	0,
 };
 
-/**
- * nfs_name_to_address - resolve hostname to an IPv4 or IPv6 socket address
- * @hostname: pointer to C string containing DNS hostname to resolve
- * @sap: pointer to buffer to fill with socket address
- * @len: IN: size of buffer to fill; OUT: size of socket address
- *
- * Returns 1 and places a socket address at @sap if successful;
- * otherwise zero.
- */
-int nfs_name_to_address(const char *hostname,
-			const sa_family_t af_hint,
-			struct sockaddr *sap, socklen_t *salen)
+static int nfs_lookup(const char *hostname, const sa_family_t family,
+		      struct sockaddr *sap, socklen_t *salen)
 {
 	struct addrinfo *gai_results;
 	struct addrinfo gai_hint = {
-		.ai_family	= af_hint,
+#ifdef HAVE_DECL_AI_ADDRCONFIG
 		.ai_flags	= AI_ADDRCONFIG,
+#endif	/* HAVE_DECL_AI_ADDRCONFIG */
+		.ai_family	= family,
 	};
 	socklen_t len = *salen;
 	int error, ret = 0;
 
-	if (af_hint == AF_INET6)
-		gai_hint.ai_flags |= AI_V4MAPPED|AI_ALL;
-
 	*salen = 0;
 
 	error = getaddrinfo(hostname, NULL, &gai_hint, &gai_results);
-	if (error) {
+	switch (error) {
+	case 0:
+		break;
+	case EAI_SYSTEM:
 		nfs_error(_("%s: DNS resolution failed for %s: %s"),
-			progname, hostname, (error == EAI_SYSTEM ?
-				strerror(errno) : gai_strerror(error)));
+			progname, hostname, strerror(errno));
+		return ret;
+	default:
+		nfs_error(_("%s: DNS resolution failed for %s: %s"),
+			progname, hostname, gai_strerror(error));
 		return ret;
 	}
 
@@ -200,10 +219,29 @@ int nfs_name_to_address(const char *hostname,
 	return ret;
 }
 
+/**
+ * nfs_name_to_address - resolve hostname to an IPv4 or IPv6 socket address
+ * @hostname: pointer to C string containing DNS hostname to resolve
+ * @sap: pointer to buffer to fill with socket address
+ * @len: IN: size of buffer to fill; OUT: size of socket address
+ *
+ * Returns 1 and places a socket address at @sap if successful;
+ * otherwise zero.
+ */
+int nfs_name_to_address(const char *hostname,
+			struct sockaddr *sap, socklen_t *salen)
+{
+#ifdef IPV6_SUPPORTED
+	return nfs_lookup(hostname, AF_UNSPEC, sap, salen);
+#else	/* !IPV6_SUPPORTED */
+	return nfs_lookup(hostname, AF_INET, sap, salen);
+#endif	/* !IPV6_SUPPORTED */
+}
+
 /**
  * nfs_gethostbyname - resolve a hostname to an IPv4 address
  * @hostname: pointer to a C string containing a DNS hostname
- * @saddr: returns an IPv4 address 
+ * @sin: returns an IPv4 address 
  *
  * Returns 1 if successful, otherwise zero.
  */
@@ -211,8 +249,7 @@ int nfs_gethostbyname(const char *hostname, struct sockaddr_in *sin)
 {
 	socklen_t len = sizeof(*sin);
 
-	return nfs_name_to_address(hostname, AF_INET,
-					(struct sockaddr *)sin, &len);
+	return nfs_lookup(hostname, AF_INET, (struct sockaddr *)sin, &len);
 }
 
 /**
@@ -435,132 +472,111 @@ err_connect:
 	return RPC_ANYSOCK;
 }
 
-/*
- * getport() is very similar to pmap_getport() with the exception that
- * this version tries to use an ephemeral port, since reserved ports are
- * not needed for GETPORT queries.  This conserves the very limited
- * reserved port space, which helps reduce failed socket binds
- * during mount storms.
- *
- * A side effect of calling this function is that rpccreateerr is set.
- */
-static unsigned short getport(struct sockaddr_in *saddr,
-				unsigned long program,
-				unsigned long version,
-				unsigned int proto)
-{
-	struct sockaddr_in bind_saddr;
-	unsigned short port = 0;
-	int socket;
-	CLIENT *clnt = NULL;
-	enum clnt_stat stat;
- 
-	bind_saddr = *saddr;
-	bind_saddr.sin_port = htons(PMAPPORT);
-
-	socket = get_socket(&bind_saddr, proto, PMAP_TIMEOUT, FALSE, FALSE);
-	if (socket == RPC_ANYSOCK) {
-		if (proto == IPPROTO_TCP &&
-		    rpc_createerr.cf_error.re_errno == ETIMEDOUT)
-			rpc_createerr.cf_stat = RPC_TIMEDOUT;
-		return 0;
-	}
+static void nfs_pp_debug(const struct sockaddr *sap, const socklen_t salen,
+			 const rpcprog_t program, const rpcvers_t version,
+			 const unsigned short protocol,
+			 const unsigned short port)
+{
+	char buf[NI_MAXHOST];
 
-	switch (proto) {
-	case IPPROTO_UDP:
-		clnt = clntudp_bufcreate(&bind_saddr,
-					 PMAPPROG, PMAPVERS,
-					 RETRY_TIMEOUT, &socket,
-					 RPCSMALLMSGSIZE,
-					 RPCSMALLMSGSIZE);
-		break;
-	case IPPROTO_TCP:
-		clnt = clnttcp_create(&bind_saddr,
-				      PMAPPROG, PMAPVERS,
-				      &socket,
-				      RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
-		break;
-	}
-	if (clnt != NULL) {
-		struct pmap parms = {
-			.pm_prog	= program,
-			.pm_vers	= version,
-			.pm_prot	= proto,
-		};
-
-		stat = clnt_call(clnt, PMAPPROC_GETPORT,
-				 (xdrproc_t)xdr_pmap, (caddr_t)&parms,
-				 (xdrproc_t)xdr_u_short, (caddr_t)&port,
-				 TIMEOUT);
-		if (stat) {
-			clnt_geterr(clnt, &rpc_createerr.cf_error);
-			rpc_createerr.cf_stat = stat;
-		}
-		clnt_destroy(clnt);
-		if (stat != RPC_SUCCESS)
-			port = 0;
-		else if (port == 0)
-			rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
+	if (!verbose)
+		return;
+
+	if (nfs_present_sockaddr(sap, salen, buf, sizeof(buf)) == 0) {
+		buf[0] = '\0';
+		strcat(buf, "unknown host");
 	}
-	close(socket);
 
-	return port;
+	fprintf(stderr, _("%s: trying %s prog %lu vers %lu prot %s port %d\n"),
+			progname, buf, (unsigned long)program,
+			(unsigned long)version,
+			(protocol == IPPROTO_UDP ? _("UDP") : _("TCP")),
+			port);
+}
+
+static void nfs_pp_debug2(const char *str)
+{
+	if (!verbose)
+		return;
+
+	if (rpc_createerr.cf_error.re_status == RPC_CANTRECV ||
+	    rpc_createerr.cf_error.re_status == RPC_CANTSEND)
+		nfs_error(_("%s: portmap query %s%s - %s"),
+				progname, str, clnt_spcreateerror(""),
+				strerror(rpc_createerr.cf_error.re_errno));
+	else
+		nfs_error(_("%s: portmap query %s%s"),
+				progname, str, clnt_spcreateerror(""));
 }
 
 /*
  * Use the portmapper to discover whether or not the service we want is
  * available. The lists 'versions' and 'protos' define ordered sequences
  * of service versions and udp/tcp protocols to probe for.
+ *
+ * Returns 1 if the requested service port is unambiguous and pingable;
+ * @pmap is filled in with the version, port, and transport protocol used
+ * during the successful ping.  Note that if a port is already specified
+ * in @pmap and it matches the rpcbind query result, nfs_probe_port() does
+ * not perform an RPC ping.
+ * 
+ * If an error occurs or the requested service isn't available, zero is
+ * returned; rpccreateerr.cf_stat is set to reflect the nature of the error.
  */
-static int probe_port(clnt_addr_t *server, const unsigned long *versions,
-			const unsigned int *protos)
+static int nfs_probe_port(const struct sockaddr *sap, const socklen_t salen,
+			  struct pmap *pmap, const unsigned long *versions,
+			  const unsigned int *protos)
 {
-	struct sockaddr_in *saddr = &server->saddr;
-	struct pmap *pmap = &server->pmap;
+	struct sockaddr_storage address;
+	struct sockaddr *saddr = (struct sockaddr *)&address;
 	const unsigned long prog = pmap->pm_prog, *p_vers;
 	const unsigned int prot = (u_int)pmap->pm_prot, *p_prot;
 	const u_short port = (u_short) pmap->pm_port;
 	unsigned long vers = pmap->pm_vers;
 	unsigned short p_port;
 
+	memcpy(saddr, sap, salen);
 	p_prot = prot ? &prot : protos;
 	p_vers = vers ? &vers : versions;
-	rpc_createerr.cf_stat = 0;
+
 	for (;;) {
-		p_port = getport(saddr, prog, *p_vers, *p_prot);
+		if (verbose)
+			printf(_("%s: prog %lu, trying vers=%lu, prot=%u\n"),
+				progname, prog, *p_vers, *p_prot);
+		p_port = nfs_getport(saddr, salen, prog, *p_vers, *p_prot);
 		if (p_port) {
 			if (!port || port == p_port) {
-				saddr->sin_port = htons(p_port);
-				if (verbose) {
-					printf(_("%s: trying %s prog %ld vers "
-						"%ld prot %s port %d\n"),
-						progname,
-						inet_ntoa(saddr->sin_addr),
-						prog, *p_vers,
-						*p_prot == IPPROTO_UDP ?
-							_("UDP") : _("TCP"),
-						p_port);
-                                }
-				if (clnt_ping(saddr, prog, *p_vers, *p_prot, NULL))
+				nfs_set_port(saddr, p_port);
+				nfs_pp_debug(saddr, salen, prog, *p_vers,
+						*p_prot, p_port);
+				if (nfs_rpc_ping(saddr, salen, prog,
+							*p_vers, *p_prot, NULL))
 					goto out_ok;
-				if (rpc_createerr.cf_stat == RPC_TIMEDOUT)
-					goto out_bad;
-			}
+			} else
+				rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
 		}
 		if (rpc_createerr.cf_stat != RPC_PROGNOTREGISTERED &&
+		    rpc_createerr.cf_stat != RPC_TIMEDOUT &&
+		    rpc_createerr.cf_stat != RPC_CANTRECV &&
 		    rpc_createerr.cf_stat != RPC_PROGVERSMISMATCH)
-			goto out_bad;
+			break;
 
 		if (!prot) {
-			if (*++p_prot)
+			if (*++p_prot) {
+				nfs_pp_debug2("retrying");
 				continue;
+			}
 			p_prot = protos;
 		}
+		if (rpc_createerr.cf_stat == RPC_TIMEDOUT ||
+		    rpc_createerr.cf_stat == RPC_CANTRECV)
+			break;
+
 		if (vers || !*++p_vers)
 			break;
 	}
 
-out_bad:
+	nfs_pp_debug2("failed");
 	return 0;
 
 out_ok:
@@ -570,60 +586,118 @@ out_ok:
 		pmap->pm_prot = *p_prot;
 	if (!port)
 		pmap->pm_port = p_port;
-	rpc_createerr.cf_stat = 0;
+	nfs_clear_rpc_createerr();
 	return 1;
 }
 
-static int probe_nfsport(clnt_addr_t *nfs_server)
+/*
+ * Probe a server's NFS service to determine which versions and
+ * transport protocols are supported.
+ *
+ * Returns 1 if the requested service port is unambiguous and pingable;
+ * @pmap is filled in with the version, port, and transport protocol used
+ * during the successful ping.  If all three are already specified, simply
+ * return success without an rpcbind query or RPC ping (we may be trying
+ * to mount an NFS service that is not advertised via rpcbind).
+ *
+ * If an error occurs or the requested service isn't available, zero is
+ * returned; rpccreateerr.cf_stat is set to reflect the nature of the error.
+ */
+static int nfs_probe_nfsport(const struct sockaddr *sap, const socklen_t salen,
+				struct pmap *pmap)
 {
-	struct pmap *pmap = &nfs_server->pmap;
-
 	if (pmap->pm_vers && pmap->pm_prot && pmap->pm_port)
 		return 1;
 
 	if (nfs_mount_data_version >= 4)
-		return probe_port(nfs_server, probe_nfs3_first, probe_tcp_first);
+		return nfs_probe_port(sap, salen, pmap,
+					probe_nfs3_first, probe_tcp_first);
 	else
-		return probe_port(nfs_server, probe_nfs2_only, probe_udp_only);
+		return nfs_probe_port(sap, salen, pmap,
+					probe_nfs2_only, probe_udp_only);
 }
 
-static int probe_mntport(clnt_addr_t *mnt_server)
+/*
+ * Probe a server's mountd service to determine which versions and
+ * transport protocols are supported.
+ *
+ * Returns 1 if the requested service port is unambiguous and pingable;
+ * @pmap is filled in with the version, port, and transport protocol used
+ * during the successful ping.  If all three are already specified, simply
+ * return success without an rpcbind query or RPC ping (we may be trying
+ * to mount an NFS service that is not advertised via rpcbind).
+ * 
+ * If an error occurs or the requested service isn't available, zero is
+ * returned; rpccreateerr.cf_stat is set to reflect the nature of the error.
+ */
+static int nfs_probe_mntport(const struct sockaddr *sap, const socklen_t salen,
+				struct pmap *pmap)
 {
-	struct pmap *pmap = &mnt_server->pmap;
-
 	if (pmap->pm_vers && pmap->pm_prot && pmap->pm_port)
 		return 1;
 
 	if (nfs_mount_data_version >= 4)
-		return probe_port(mnt_server, probe_mnt3_first, probe_udp_first);
+		return nfs_probe_port(sap, salen, pmap,
+					probe_mnt3_first, probe_udp_first);
 	else
-		return probe_port(mnt_server, probe_mnt1_first, probe_udp_only);
+		return nfs_probe_port(sap, salen, pmap,
+					probe_mnt1_first, probe_udp_only);
 }
 
-/**
- * probe_bothports - discover the RPC endpoints of mountd and NFS server
- * @mnt_server: pointer to address and pmap argument for mountd results
- * @nfs_server: pointer to address and pmap argument for NFS server
+/*
+ * Probe a server's mountd service to determine which versions and
+ * transport protocols are supported.  Invoked when the protocol
+ * version is already known for both the NFS and mountd service.
  *
- * Returns 1 if successful, otherwise zero if some error occurred.
- * Note that the arguments are both input and output arguments.
+ * Returns 1 and fills in both @pmap structs if the requested service
+ * ports are unambiguous and pingable.  Otherwise zero is returned;
+ * rpccreateerr.cf_stat is set to reflect the nature of the error.
+ */
+static int nfs_probe_version_fixed(const struct sockaddr *mnt_saddr,
+			const socklen_t mnt_salen,
+			struct pmap *mnt_pmap,
+			const struct sockaddr *nfs_saddr,
+			const socklen_t nfs_salen,
+			struct pmap *nfs_pmap)
+{
+	if (!nfs_probe_nfsport(nfs_saddr, nfs_salen, nfs_pmap))
+		return 0;
+	return nfs_probe_mntport(mnt_saddr, mnt_salen, mnt_pmap);
+}
+
+/**
+ * nfs_probe_bothports - discover the RPC endpoints of mountd and NFS server
+ * @mnt_saddr:	pointer to socket address of mountd server
+ * @mnt_salen:	length of mountd server's address
+ * @mnt_pmap:	IN: partially filled-in mountd RPC service tuple;
+ *		OUT: fully filled-in mountd RPC service tuple
+ * @nfs_saddr:	pointer to socket address of NFS server
+ * @nfs_salen:	length of NFS server's address
+ * @nfs_pmap:	IN: partially filled-in NFS RPC service tuple;
+ *		OUT: fully filled-in NFS RPC service tuple
  *
- * A side effect of calling this function is that rpccreateerr is set.
+ * Returns 1 and fills in both @pmap structs if the requested service
+ * ports are unambiguous and pingable.  Otherwise zero is returned;
+ * rpccreateerr.cf_stat is set to reflect the nature of the error.
  */
-int probe_bothports(clnt_addr_t *mnt_server, clnt_addr_t *nfs_server)
+int nfs_probe_bothports(const struct sockaddr *mnt_saddr,
+			const socklen_t mnt_salen,
+			struct pmap *mnt_pmap,
+			const struct sockaddr *nfs_saddr,
+			const socklen_t nfs_salen,
+			struct pmap *nfs_pmap)
 {
-	struct pmap *nfs_pmap = &nfs_server->pmap;
-	struct pmap *mnt_pmap = &mnt_server->pmap;
 	struct pmap save_nfs, save_mnt;
-	int res;
 	const unsigned long *probe_vers;
 
 	if (mnt_pmap->pm_vers && !nfs_pmap->pm_vers)
 		nfs_pmap->pm_vers = mntvers_to_nfs(mnt_pmap->pm_vers);
 	else if (nfs_pmap->pm_vers && !mnt_pmap->pm_vers)
 		mnt_pmap->pm_vers = nfsvers_to_mnt(nfs_pmap->pm_vers);
+
 	if (nfs_pmap->pm_vers)
-		goto version_fixed;
+		return nfs_probe_version_fixed(mnt_saddr, mnt_salen, mnt_pmap,
+					       nfs_saddr, nfs_salen, nfs_pmap);
 
 	memcpy(&save_nfs, nfs_pmap, sizeof(save_nfs));
 	memcpy(&save_mnt, mnt_pmap, sizeof(save_mnt));
@@ -632,9 +706,9 @@ int probe_bothports(clnt_addr_t *mnt_server, clnt_addr_t *nfs_server)
 
 	for (; *probe_vers; probe_vers++) {
 		nfs_pmap->pm_vers = mntvers_to_nfs(*probe_vers);
-		if ((res = probe_nfsport(nfs_server) != 0)) {
+		if (nfs_probe_nfsport(nfs_saddr, nfs_salen, nfs_pmap) != 0) {
 			mnt_pmap->pm_vers = *probe_vers;
-			if ((res = probe_mntport(mnt_server)) != 0)
+			if (nfs_probe_mntport(mnt_saddr, mnt_salen, mnt_pmap) != 0)
 				return 1;
 			memcpy(mnt_pmap, &save_mnt, sizeof(*mnt_pmap));
 		}
@@ -643,38 +717,47 @@ int probe_bothports(clnt_addr_t *mnt_server, clnt_addr_t *nfs_server)
 		case RPC_PROGNOTREGISTERED:
 			break;
 		default:
-			goto out_bad;
+			return 0;
 		}
 		memcpy(nfs_pmap, &save_nfs, sizeof(*nfs_pmap));
 	}
 
-out_bad:
 	return 0;
-
-version_fixed:
-	if (!probe_nfsport(nfs_server))
-		goto out_bad;
-	return probe_mntport(mnt_server);
 }
 
-static int probe_statd(void)
+/**
+ * probe_bothports - discover the RPC endpoints of mountd and NFS server
+ * @mnt_server: pointer to address and pmap argument for mountd results
+ * @nfs_server: pointer to address and pmap argument for NFS server
+ *
+ * This is the legacy API that takes "clnt_addr_t" for both servers,
+ * but supports only AF_INET addresses.
+ *
+ * Returns 1 and fills in the pmap field in both clnt_addr_t structs
+ * if the requested service ports are unambiguous and pingable.
+ * Otherwise zero is returned; rpccreateerr.cf_stat is set to reflect
+ * the nature of the error.
+ */
+int probe_bothports(clnt_addr_t *mnt_server, clnt_addr_t *nfs_server)
 {
-	struct sockaddr_in addr;
-	unsigned short port;
-
-	memset(&addr, 0, sizeof(addr));
-	addr.sin_family = AF_INET;
-	addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
-	port = getport(&addr, 100024, 1, IPPROTO_UDP);
-
-	if (port == 0)
-		return 0;
-	addr.sin_port = htons(port);
+	return nfs_probe_bothports((struct sockaddr *)&mnt_server->saddr,
+					sizeof(mnt_server->saddr),
+					&mnt_server->pmap,
+					(struct sockaddr *)&nfs_server->saddr,
+					sizeof(nfs_server->saddr),
+					&nfs_server->pmap);
+}
 
-	if (clnt_ping(&addr, 100024, 1, IPPROTO_UDP, NULL) <= 0)
-		return 0;
+static int nfs_probe_statd(void)
+{
+	struct sockaddr_in addr = {
+		.sin_family		= AF_INET,
+		.sin_addr.s_addr	= htonl(INADDR_LOOPBACK),
+	};
+	rpcprog_t program = nfs_getrpcbyname(NSMPROG, nfs_ns_pgmtbl);
 
-	return 1;
+	return nfs_getport_ping((struct sockaddr *)&addr, sizeof(addr),
+				program, (rpcvers_t)1, IPPROTO_UDP);
 }
 
 /**
@@ -688,14 +771,26 @@ int start_statd(void)
 	struct stat stb;
 #endif
 
-	if (probe_statd())
+	if (nfs_probe_statd())
 		return 1;
 
 #ifdef START_STATD
 	if (stat(START_STATD, &stb) == 0) {
 		if (S_ISREG(stb.st_mode) && (stb.st_mode & S_IXUSR)) {
-			system(START_STATD);
-			if (probe_statd())
+			pid_t pid = fork();
+			switch (pid) {
+			case 0: /* child */
+				execl(START_STATD, START_STATD, NULL);
+				exit(1);
+			case -1: /* error */
+				nfs_error(_("%s: fork failed: %s"),
+						progname, strerror(errno));
+				break;
+			default: /* parent */
+				waitpid(pid, NULL,0);
+				break;
+			}
+			if (nfs_probe_statd())
 				return 1;
 		}
 	}
@@ -704,6 +799,68 @@ int start_statd(void)
 	return 0;
 }
 
+/**
+ * nfs_advise_umount - ask the server to remove a share from it's rmtab
+ * @sap: pointer to IP address of server to call
+ * @salen: length of server address
+ * @pmap: partially filled-in mountd RPC service tuple
+ * @argp: directory path of share to "unmount"
+ *
+ * Returns one if the unmount call succeeded; zero if the unmount
+ * failed for any reason;  rpccreateerr.cf_stat is set to reflect
+ * the nature of the error.
+ *
+ * We use a fast timeout since this call is advisory only.
+ */
+int nfs_advise_umount(const struct sockaddr *sap, const socklen_t salen,
+		      const struct pmap *pmap, const dirpath *argp)
+{
+	struct sockaddr_storage address;
+	struct sockaddr *saddr = (struct sockaddr *)&address;
+	struct pmap mnt_pmap = *pmap;
+	struct timeval timeout = {
+		.tv_sec		= MOUNT_TIMEOUT >> 3,
+	};
+	CLIENT *client;
+	enum clnt_stat res = 0;
+
+	memcpy(saddr, sap, salen);
+	if (nfs_probe_mntport(saddr, salen, &mnt_pmap) == 0) {
+		if (verbose)
+			nfs_error(_("%s: Failed to discover mountd port%s"),
+				progname, clnt_spcreateerror(""));
+		return 0;
+	}
+	nfs_set_port(saddr, mnt_pmap.pm_port);
+
+	client = nfs_get_priv_rpcclient(saddr, salen, mnt_pmap.pm_prot,
+					mnt_pmap.pm_prog, mnt_pmap.pm_vers,
+					&timeout);
+	if (client == NULL) {
+		if (verbose)
+			nfs_error(_("%s: Failed to create RPC client%s"),
+				progname, clnt_spcreateerror(""));
+		return 0;
+	}
+
+	client->cl_auth = authunix_create_default();
+
+	res = CLNT_CALL(client, MOUNTPROC_UMNT,
+			(xdrproc_t)xdr_dirpath, (caddr_t)argp,
+			(xdrproc_t)xdr_void, NULL,
+			timeout);
+	if (verbose && res != RPC_SUCCESS)
+		nfs_error(_("%s: UMNT call failed: %s"),
+			progname, clnt_sperrno(res));
+
+	auth_destroy(client->cl_auth);
+	CLNT_DESTROY(client);
+
+	if (res != RPC_SUCCESS)
+		return 0;
+	return 1;
+}
+
 /**
  * nfs_call_umount - ask the server to remove a share from it's rmtab
  * @mnt_server: address of RPC MNT program server
@@ -717,11 +874,14 @@ int start_statd(void)
  */
 int nfs_call_umount(clnt_addr_t *mnt_server, dirpath *argp)
 {
+	struct sockaddr *sap = (struct sockaddr *)&mnt_server->saddr;
+	socklen_t salen = sizeof(mnt_server->saddr);
+	struct pmap *pmap = &mnt_server->pmap;
 	CLIENT *clnt;
 	enum clnt_stat res = 0;
 	int msock;
 
-	if (!probe_mntport(mnt_server))
+	if (!nfs_probe_mntport(sap, salen, pmap))
 		return 0;
 	clnt = mnt_openclnt(mnt_server, &msock);
 	if (!clnt)
@@ -806,9 +966,9 @@ void mnt_closeclnt(CLIENT *clnt, int msock)
  * @prot: target RPC protocol
  * @caddr: filled in with our network address
  *
- * Sigh... getport() doesn't actually check the version number.
+ * Sigh... GETPORT queries don't actually check the version number.
  * In order to make sure that the server actually supports the service
- * we're requesting, we open and RPC client, and fire off a NULL
+ * we're requesting, we open an RPC client, and fire off a NULL
  * RPC call.
  *
  * caddr is the network address that the server will use to call us back.
@@ -943,7 +1103,7 @@ static int nfs_ca_sockname(const struct sockaddr *sap, const socklen_t salen,
  *
  * Returns 1 and fills in @buf if successful; otherwise, zero.
  */
-static int nfs_ca_gai(const struct sockaddr *sap, const socklen_t salen,
+static int nfs_ca_gai(const struct sockaddr *sap,
 		      struct sockaddr *buf, socklen_t *buflen)
 {
 	struct addrinfo *gai_results;
@@ -984,7 +1144,7 @@ int nfs_callback_address(const struct sockaddr *sap, const socklen_t salen,
 	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf;
 
 	if (nfs_ca_sockname(sap, salen, buf, buflen) == 0)
-		if (nfs_ca_gai(sap, salen, buf, buflen) == 0)
+		if (nfs_ca_gai(sap, buf, buflen) == 0)
 			goto out_failed;
 
 	/*
@@ -999,7 +1159,316 @@ int nfs_callback_address(const struct sockaddr *sap, const socklen_t salen,
 out_failed:
 	*buflen = 0;
 	if (verbose)
-		nfs_error(_("%s: failed to construct callback address"));
+		nfs_error(_("%s: failed to construct callback address"),
+				progname);
 	return 0;
+}
+
+/*
+ * "nfsprog" is supported only by the legacy mount command.  The
+ * kernel mount client does not support this option.
+ *
+ * Returns TRUE if @program contains a valid value for this option,
+ * or FALSE if the option was specified with an invalid value.
+ */
+static int
+nfs_nfs_program(struct mount_options *options, unsigned long *program)
+{
+	long tmp;
 
+	switch (po_get_numeric(options, "nfsprog", &tmp)) {
+	case PO_NOT_FOUND:
+		break;
+	case PO_FOUND:
+		if (tmp > 0) {
+			*program = tmp;
+			return 1;
+		}
+	case PO_BAD_VALUE:
+		return 0;
+	}
+
+	/*
+	 * NFS RPC program wasn't specified.  The RPC program
+	 * cannot be determined via an rpcbind query.
+	 */
+	*program = nfs_getrpcbyname(NFSPROG, nfs_nfs_pgmtbl);
+	return 1;
+}
+
+/*
+ * Returns TRUE if @version contains a valid value for this option,
+ * or FALSE if the option was specified with an invalid value.
+ */
+static int
+nfs_nfs_version(struct mount_options *options, unsigned long *version)
+{
+	long tmp;
+
+	switch (po_rightmost(options, nfs_version_opttbl)) {
+	case 0:	/* v2 */
+		*version = 2;
+		return 1;
+	case 1: /* v3 */
+		*version = 3;
+		return 1;
+	case 2:	/* vers */
+		switch (po_get_numeric(options, "vers", &tmp)) {
+		case PO_FOUND:
+			if (tmp >= 2 && tmp <= 3) {
+				*version = tmp;
+				return 1;
+			}
+			return 0;
+		case PO_NOT_FOUND:
+			nfs_error(_("%s: option parsing error\n"),
+					progname);
+		case PO_BAD_VALUE:
+			return 0;
+		}
+	case 3: /* nfsvers */
+		switch (po_get_numeric(options, "nfsvers", &tmp)) {
+		case PO_FOUND:
+			if (tmp >= 2 && tmp <= 3) {
+				*version = tmp;
+				return 1;
+			}
+			return 0;
+		case PO_NOT_FOUND:
+			nfs_error(_("%s: option parsing error\n"),
+					progname);
+		case PO_BAD_VALUE:
+			return 0;
+		}
+	}
+
+	/*
+	 * NFS version wasn't specified.  The pmap version value
+	 * will be filled in later by an rpcbind query in this case.
+	 */
+	*version = 0;
+	return 1;
+}
+
+/*
+ * Returns TRUE if @protocol contains a valid value for this option,
+ * or FALSE if the option was specified with an invalid value.
+ */
+static int
+nfs_nfs_protocol(struct mount_options *options, unsigned long *protocol)
+{
+	char *option;
+
+	switch (po_rightmost(options, nfs_transport_opttbl)) {
+	case 0:	/* udp */
+		*protocol = IPPROTO_UDP;
+		return 1;
+	case 1: /* tcp */
+		*protocol = IPPROTO_TCP;
+		return 1;
+	case 2: /* proto */
+		option = po_get(options, "proto");
+		if (option) {
+			if (strcmp(option, "tcp") == 0) {
+				*protocol = IPPROTO_TCP;
+				return 1;
+			}
+			if (strcmp(option, "udp") == 0) {
+				*protocol = IPPROTO_UDP;
+				return 1;
+			}
+			return 0;
+		}
+	}
+
+	/*
+	 * NFS transport protocol wasn't specified.  The pmap
+	 * protocol value will be filled in later by an rpcbind
+	 * query in this case.
+	 */
+	*protocol = 0;
+	return 1;
+}
+
+/*
+ * Returns TRUE if @port contains a valid value for this option,
+ * or FALSE if the option was specified with an invalid value.
+ */
+static int
+nfs_nfs_port(struct mount_options *options, unsigned long *port)
+{
+	long tmp;
+
+	switch (po_get_numeric(options, "port", &tmp)) {
+	case PO_NOT_FOUND:
+		break;
+	case PO_FOUND:
+		if (tmp >= 1 && tmp <= 65535) {
+			*port = tmp;
+			return 1;
+		}
+	case PO_BAD_VALUE:
+		return 0;
+	}
+
+	/*
+	 * NFS service port wasn't specified.  The pmap port value
+	 * will be filled in later by an rpcbind query in this case.
+	 */
+	*port = 0;
+	return 1;
+}
+
+/*
+ * "mountprog" is supported only by the legacy mount command.  The
+ * kernel mount client does not support this option.
+ *
+ * Returns TRUE if @program contains a valid value for this option,
+ * or FALSE if the option was specified with an invalid value.
+ */
+static int
+nfs_mount_program(struct mount_options *options, unsigned long *program)
+{
+	long tmp;
+
+	switch (po_get_numeric(options, "mountprog", &tmp)) {
+	case PO_NOT_FOUND:
+		break;
+	case PO_FOUND:
+		if (tmp > 0) {
+			*program = tmp;
+			return 1;
+		}
+	case PO_BAD_VALUE:
+		return 0;
+	}
+
+	/*
+	 * MNT RPC program wasn't specified.  The RPC program
+	 * cannot be determined via an rpcbind query.
+	 */
+	*program = nfs_getrpcbyname(MOUNTPROG, nfs_mnt_pgmtbl);
+	return 1;
+}
+
+/*
+ * Returns TRUE if @version contains a valid value for this option,
+ * or FALSE if the option was specified with an invalid value.
+ */
+static int
+nfs_mount_version(struct mount_options *options, unsigned long *version)
+{
+	long tmp;
+
+	switch (po_get_numeric(options, "mountvers", &tmp)) {
+	case PO_NOT_FOUND:
+		break;
+	case PO_FOUND:
+		if (tmp >= 1 && tmp <= 4) {
+			*version = tmp;
+			return 1;
+		}
+	case PO_BAD_VALUE:
+		return 0;
+	}
+
+	/*
+	 * MNT version wasn't specified.  The pmap version value
+	 * will be filled in later by an rpcbind query in this case.
+	 */
+	*version = 0;
+	return 1;
+}
+
+/*
+ * Returns TRUE if @protocol contains a valid value for this option,
+ * or FALSE if the option was specified with an invalid value.
+ */
+static int
+nfs_mount_protocol(struct mount_options *options, unsigned long *protocol)
+{
+	char *option;
+
+	option = po_get(options, "mountproto");
+	if (option) {
+		if (strcmp(option, "tcp") == 0) {
+			*protocol = IPPROTO_TCP;
+			return 1;
+		}
+		if (strcmp(option, "udp") == 0) {
+			*protocol = IPPROTO_UDP;
+			return 1;
+		}
+		return 0;
+	}
+
+	/*
+	 * MNT transport protocol wasn't specified.  If the NFS
+	 * transport protocol was specified, use that; otherwise
+	 * set @protocol to zero.  The pmap protocol value will
+	 * be filled in later by an rpcbind query in this case.
+	 */
+	return nfs_nfs_protocol(options, protocol);
+}
+
+/*
+ * Returns TRUE if @port contains a valid value for this option,
+ * or FALSE if the option was specified with an invalid value.
+ */
+static int
+nfs_mount_port(struct mount_options *options, unsigned long *port)
+{
+	long tmp;
+
+	switch (po_get_numeric(options, "mountport", &tmp)) {
+	case PO_NOT_FOUND:
+		break;
+	case PO_FOUND:
+		if (tmp >= 1 && tmp <= 65535) {
+			*port = tmp;
+			return 1;
+		}
+	case PO_BAD_VALUE:
+		return 0;
+	}
+
+	/*
+	 * MNT service port wasn't specified.  The pmap port value
+	 * will be filled in later by an rpcbind query in this case.
+	 */
+	*port = 0;
+	return 1;
+}
+
+/**
+ * nfs_options2pmap - set up pmap structs based on mount options
+ * @options: pointer to mount options
+ * @nfs_pmap: OUT: pointer to pmap arguments for NFS server
+ * @mnt_pmap: OUT: pointer to pmap arguments for mountd server
+ *
+ * Returns TRUE if the pmap options specified in @options have valid
+ * values; otherwise FALSE is returned.
+ */
+int nfs_options2pmap(struct mount_options *options,
+		     struct pmap *nfs_pmap, struct pmap *mnt_pmap)
+{
+	if (!nfs_nfs_program(options, &nfs_pmap->pm_prog))
+		return 0;
+	if (!nfs_nfs_version(options, &nfs_pmap->pm_vers))
+		return 0;
+	if (!nfs_nfs_protocol(options, &nfs_pmap->pm_prot))
+		return 0;
+	if (!nfs_nfs_port(options, &nfs_pmap->pm_port))
+		return 0;
+
+	if (!nfs_mount_program(options, &mnt_pmap->pm_prog))
+		return 0;
+	if (!nfs_mount_version(options, &mnt_pmap->pm_vers))
+		return 0;
+	if (!nfs_mount_protocol(options, &mnt_pmap->pm_prot))
+		return 0;
+	if (!nfs_mount_port(options, &mnt_pmap->pm_port))
+		return 0;
+
+	return 1;
 }