X-Git-Url: https://git.decadent.org.uk/gitweb/?p=nfs-utils.git;a=blobdiff_plain;f=utils%2Fmount%2Fnetwork.c;h=efedf25462f89d0989e0903ec6634b0500e090b9;hp=b04491c7e38605c8a0056803eb4bea962d4eccef;hb=a786c016f0af6fa116ae2483d6261dbed009d87e;hpb=a4b10d48a730fbc6ff62197facddccdf7e204610

diff --git a/utils/mount/network.c b/utils/mount/network.c
index b04491c..efedf25 100644
--- a/utils/mount/network.c
+++ b/utils/mount/network.c
@@ -34,11 +34,9 @@
 #include <rpc/pmap_clnt.h>
 #include <sys/socket.h>
 
-#include "conn.h"
 #include "xcommon.h"
 #include "mount.h"
 #include "nls.h"
-#include "nfsumount.h"
 #include "nfs_mount.h"
 #include "mount_constants.h"
 #include "network.h"
@@ -54,10 +52,48 @@
 #define NFS_PORT 2049
 #endif
 
+#if SIZEOF_SOCKLEN_T - 0 == 0
+#define socklen_t unsigned int
+#endif
+
 extern int nfs_mount_data_version;
 extern char *progname;
 extern int verbose;
 
+static const unsigned long nfs_to_mnt[] = {
+	0,
+	0,
+	1,
+	3,
+};
+
+static const unsigned long mnt_to_nfs[] = {
+	0,
+	2,
+	2,
+	3,
+};
+
+/*
+ * Map an NFS version into the corresponding Mountd version
+ */
+unsigned long nfsvers_to_mnt(const unsigned long vers)
+{
+	if (vers <= 3)
+		return nfs_to_mnt[vers];
+	return 0;
+}
+
+/*
+ * Map a Mountd version into the corresponding NFS version
+ */
+static unsigned long mntvers_to_nfs(const unsigned long vers)
+{
+	if (vers <= 3)
+		return mnt_to_nfs[vers];
+	return 0;
+}
+
 static const unsigned int probe_udp_only[] = {
 	IPPROTO_UDP,
 	0,
@@ -122,42 +158,145 @@ int nfs_gethostbyname(const char *hostname, struct sockaddr_in *saddr)
 }
 
 /*
- * getport() is very similar to pmap_getport() with
- * the exception this version uses a non-reserve ports
- * instead of reserve ports since reserve ports
- * are not needed for pmap requests.
+ * Create a socket that is locally bound to a reserved or non-reserved
+ * port. For any failures, RPC_ANYSOCK is returned which will cause 
+ * the RPC code to create the socket instead. 
  */
-unsigned short getport(struct sockaddr_in *saddr, unsigned long prog,
-			unsigned long vers, unsigned int prot)
+static int get_socket(struct sockaddr_in *saddr, unsigned int p_prot,
+			int resvp, int conn)
+{
+	int so, cc, type;
+	struct sockaddr_in laddr;
+	socklen_t namelen = sizeof(laddr);
+
+	type = (p_prot == IPPROTO_UDP ? SOCK_DGRAM : SOCK_STREAM);
+	if ((so = socket (AF_INET, type, p_prot)) < 0)
+		goto err_socket;
+
+	laddr.sin_family = AF_INET;
+	laddr.sin_port = 0;
+	laddr.sin_addr.s_addr = htonl(INADDR_ANY);
+	if (resvp) {
+		if (bindresvport(so, &laddr) < 0)
+			goto err_bindresvport;
+	} else {
+		cc = bind(so, (struct sockaddr *)&laddr, namelen);
+		if (cc < 0)
+			goto err_bind;
+	}
+	if (type == SOCK_STREAM || (conn && type == SOCK_DGRAM)) {
+		cc = connect(so, (struct sockaddr *)saddr, namelen);
+		if (cc < 0)
+			goto err_connect;
+	}
+	return so;
+
+err_socket:
+	rpc_createerr.cf_stat = RPC_SYSTEMERROR;
+	rpc_createerr.cf_error.re_errno = errno;
+	if (verbose) {
+		nfs_error(_("%s: Unable to create %s socket: errno %d (%s)\n"),
+			progname, p_prot == IPPROTO_UDP ? _("UDP") : _("TCP"),
+			errno, strerror(errno));
+	}
+	return RPC_ANYSOCK;
+
+err_bindresvport:
+	rpc_createerr.cf_stat = RPC_SYSTEMERROR;
+	rpc_createerr.cf_error.re_errno = errno;
+	if (verbose) {
+		nfs_error(_("%s: Unable to bindresvport %s socket: errno %d"
+				" (%s)\n"),
+			progname, p_prot == IPPROTO_UDP ? _("UDP") : _("TCP"),
+			errno, strerror(errno));
+	}
+	close(so);
+	return RPC_ANYSOCK;
+
+err_bind:
+	rpc_createerr.cf_stat = RPC_SYSTEMERROR;
+	rpc_createerr.cf_error.re_errno = errno;
+	if (verbose) {
+		nfs_error(_("%s: Unable to bind to %s socket: errno %d (%s)\n"),
+			progname, p_prot == IPPROTO_UDP ? _("UDP") : _("TCP"),
+			errno, strerror(errno));
+	}
+	close(so);
+	return RPC_ANYSOCK;
+
+err_connect:
+	rpc_createerr.cf_stat = RPC_SYSTEMERROR;
+	rpc_createerr.cf_error.re_errno = errno;
+	if (verbose) {
+		nfs_error(_("%s: Unable to connect to %s:%d, errno %d (%s)\n"),
+			progname, inet_ntoa(saddr->sin_addr),
+			ntohs(saddr->sin_port), errno, strerror(errno));
+	}
+	close(so);
+	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)
 {
 	unsigned short port = 0;
 	int socket;
 	CLIENT *clnt = NULL;
-	struct pmap parms;
 	enum clnt_stat stat;
 
-	saddr->sin_port = htons (PMAPPORT);
-	socket = get_socket(saddr, prot, FALSE, FALSE);
+	saddr->sin_port = htons(PMAPPORT);
+
+	/*
+	 * Try to get a socket with a non-privileged port.
+	 * clnt*create() will create one anyway if this
+	 * fails.
+	 */
+	socket = get_socket(saddr, proto, FALSE, FALSE);
+	if (socket == RPC_ANYSOCK) {
+		if (proto == IPPROTO_TCP && errno == ETIMEDOUT) {
+			/*
+			 * TCP SYN timed out, so exit now.
+			 */
+			rpc_createerr.cf_stat = RPC_TIMEDOUT;
+		}
+		return 0;
+	}
 
-	switch (prot) {
+	switch (proto) {
 	case IPPROTO_UDP:
 		clnt = clntudp_bufcreate(saddr,
-					 PMAPPROG, PMAPVERS, TIMEOUT, &socket,
-					 UDPMSGSIZE, UDPMSGSIZE);
+					 PMAPPROG, PMAPVERS,
+					 RETRY_TIMEOUT, &socket,
+					 RPCSMALLMSGSIZE,
+					 RPCSMALLMSGSIZE);
 		break;
 	case IPPROTO_TCP:
-		clnt = clnttcp_create(saddr,
-			PMAPPROG, PMAPVERS, &socket, 50, 500);
+		clnt = clnttcp_create(saddr, PMAPPROG, PMAPVERS, &socket,
+				      RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
 		break;
 	}
 	if (clnt != NULL) {
-		parms.pm_prog = prog;
-		parms.pm_vers = vers;
-		parms.pm_prot = prot;
-		parms.pm_port = 0;    /* not needed or used */
-
-		stat = clnt_call(clnt, PMAPPROC_GETPORT, (xdrproc_t)xdr_pmap,
-			(caddr_t)&parms, (xdrproc_t)xdr_u_short, (caddr_t)&port, TIMEOUT);
+		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;
@@ -363,6 +502,17 @@ int start_statd(void)
 	return 0;
 }
 
+/*
+ * nfs_call_umount - ask the server to remove a share from it's rmtab
+ * @mnt_server: address of RPC MNT program server
+ * @argp: directory path of share to "unmount"
+ *
+ * Returns one if the unmount call succeeded; zero if the unmount
+ * failed for any reason.
+ *
+ * Note that a side effect of calling this function is that rpccreateerr
+ * is set.
+ */
 int nfs_call_umount(clnt_addr_t *mnt_server, dirpath *argp)
 {
 	CLIENT *clnt;
@@ -374,22 +524,146 @@ int nfs_call_umount(clnt_addr_t *mnt_server, dirpath *argp)
 	case 2:
 	case 1:
 		if (!probe_mntport(mnt_server))
-			goto out_bad;
+			return 0;
 		clnt = mnt_openclnt(mnt_server, &msock);
 		if (!clnt)
-			goto out_bad;
+			return 0;
 		res = clnt_call(clnt, MOUNTPROC_UMNT,
-				(xdrproc_t) xdr_dirpath, (caddr_t)argp,
-				(xdrproc_t) xdr_void, NULL,
+				(xdrproc_t)xdr_dirpath, (caddr_t)argp,
+				(xdrproc_t)xdr_void, NULL,
 				TIMEOUT);
 		mnt_closeclnt(clnt, msock);
 		if (res == RPC_SUCCESS)
 			return 1;
 		break;
 	default:
-		res = 1;
+		res = RPC_SUCCESS;
+		break;
+	}
+
+	if (res == RPC_SUCCESS)
+		return 1;
+	return 0;
+}
+
+CLIENT *mnt_openclnt(clnt_addr_t *mnt_server, int *msock)
+{
+	struct sockaddr_in *mnt_saddr = &mnt_server->saddr;
+	struct pmap *mnt_pmap = &mnt_server->pmap;
+	CLIENT *clnt = NULL;
+
+	mnt_saddr->sin_port = htons((u_short)mnt_pmap->pm_port);
+	*msock = get_socket(mnt_saddr, mnt_pmap->pm_prot, TRUE, FALSE);
+	if (*msock == RPC_ANYSOCK) {
+		if (rpc_createerr.cf_error.re_errno == EADDRINUSE)
+			/*
+			 * Probably in-use by a TIME_WAIT connection,
+			 * It is worth waiting a while and trying again.
+			 */
+			rpc_createerr.cf_stat = RPC_TIMEDOUT;
+		return NULL;
+	}
+
+	switch (mnt_pmap->pm_prot) {
+	case IPPROTO_UDP:
+		clnt = clntudp_bufcreate(mnt_saddr,
+					 mnt_pmap->pm_prog, mnt_pmap->pm_vers,
+					 RETRY_TIMEOUT, msock,
+					 MNT_SENDBUFSIZE, MNT_RECVBUFSIZE);
+		break;
+	case IPPROTO_TCP:
+		clnt = clnttcp_create(mnt_saddr,
+				      mnt_pmap->pm_prog, mnt_pmap->pm_vers,
+				      msock,
+				      MNT_SENDBUFSIZE, MNT_RECVBUFSIZE);
 		break;
 	}
- out_bad:
-	return res;
+	if (clnt) {
+		/* try to mount hostname:dirname */
+		clnt->cl_auth = authunix_create_default();
+		return clnt;
+	}
+	return NULL;
+}
+
+void mnt_closeclnt(CLIENT *clnt, int msock)
+{
+	auth_destroy(clnt->cl_auth);
+	clnt_destroy(clnt);
+	close(msock);
+}
+
+/*
+ * Sigh... getport() doesn'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
+ * RPC call.
+ */
+int clnt_ping(struct sockaddr_in *saddr, const unsigned long prog,
+		const unsigned long vers, const unsigned int prot,
+		struct sockaddr_in *caddr)
+{
+	CLIENT *clnt = NULL;
+	int sock, stat;
+	static char clnt_res;
+	struct sockaddr dissolve;
+
+	rpc_createerr.cf_stat = stat = errno = 0;
+	sock = get_socket(saddr, prot, FALSE, TRUE);
+	if (sock == RPC_ANYSOCK) {
+		if (errno == ETIMEDOUT) {
+			/*
+			 * TCP timeout. Bubble up the error to see 
+			 * how it should be handled.
+			 */
+			rpc_createerr.cf_stat = RPC_TIMEDOUT;
+		}
+		return 0;
+	}
+
+	if (caddr) {
+		/* Get the address of our end of this connection */
+		socklen_t len = sizeof(*caddr);
+		if (getsockname(sock, caddr, &len) != 0)
+			caddr->sin_family = 0;
+	}
+
+	switch(prot) {
+	case IPPROTO_UDP:
+		/* The socket is connected (so we could getsockname successfully),
+		 * but some servers on multi-homed hosts reply from
+		 * the wrong address, so if we stay connected, we lose the reply.
+		 */
+		dissolve.sa_family = AF_UNSPEC;
+		connect(sock, &dissolve, sizeof(dissolve));
+
+		clnt = clntudp_bufcreate(saddr, prog, vers,
+					 RETRY_TIMEOUT, &sock,
+					 RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
+		break;
+	case IPPROTO_TCP:
+		clnt = clnttcp_create(saddr, prog, vers, &sock,
+				      RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
+		break;
+	}
+	if (!clnt) {
+		close(sock);
+		return 0;
+	}
+	memset(&clnt_res, 0, sizeof(clnt_res));
+	stat = clnt_call(clnt, NULLPROC,
+			 (xdrproc_t)xdr_void, (caddr_t)NULL,
+			 (xdrproc_t)xdr_void, (caddr_t)&clnt_res,
+			 TIMEOUT);
+	if (stat) {
+		clnt_geterr(clnt, &rpc_createerr.cf_error);
+		rpc_createerr.cf_stat = stat;
+	}
+	clnt_destroy(clnt);
+	close(sock);
+
+	if (stat == RPC_SUCCESS)
+		return 1;
+	else
+		return 0;
 }