rpc.mountd: let mountd consult /etc/services for port

At RHEL, if user set port for mountd at /etc/services as
"mount   12345/tcp", mountd should be bind to 12345, but the
latest nfs-utils, mountd get a rand port, not 12345.

This patch make sure mountd be bind to the port which was set
at /etc/service.

Signed-off-by: Mi Jinlong <mijinlong@cn.fujitsu.com>
Signed-off-by: Steve Dickson <steved@redhat.com>

5 files changed, 53 insertions, 47 deletions

diff --git a/support/include/rpcmisc.h b/support/include/rpcmisc.h
index 0b06457..b806227 100644
--- a/support/include/rpcmisc.h
+++ b/support/include/rpcmisc.h
@@ -53,6 +53,7 @@ void		rpc_init(char *name, int prog, int vers,
 void		rpc_dispatch(struct svc_req *rq, SVCXPRT *xprt,
 				struct rpc_dtable *dtable, int nvers,
 				void *argp, void *resp);
+int		getservport(u_long number, const char *proto);
 
 extern int	_rpcpmstart;
 extern int	_rpcfdtype;
diff --git a/support/nfs/svc_create.c b/support/nfs/svc_create.c
index b3f75ed..c159fc8 100644
--- a/support/nfs/svc_create.c
+++ b/support/nfs/svc_create.c
@@ -393,7 +393,7 @@ nfs_svc_create(char *name, const rpcprog_t program, const rpcvers_t version,
 	const struct sigaction create_sigaction = {
 		.sa_handler	= SIG_IGN,
 	};
-	unsigned int visible, up;
+	unsigned int visible, up, servport;
 	struct netconfig *nconf;
 	void *handlep;
 
@@ -417,8 +417,13 @@ nfs_svc_create(char *name, const rpcprog_t program, const rpcvers_t version,
 		if (!(nconf->nc_flag & NC_VISIBLE))
 			continue;
 		visible++;
+		if (port == 0)
+			servport = getservport(program, nconf->nc_proto);
+		else
+			servport = port;
+
 		up += svc_create_nconf(name, program, version, dispatch,
-						port, nconf);
+						servport, nconf);
 	}
 
 	if (visible == 0)
diff --git a/support/nfs/svc_socket.c b/support/nfs/svc_socket.c
index 03a5325..c252f53 100644
--- a/support/nfs/svc_socket.c
+++ b/support/nfs/svc_socket.c
@@ -35,14 +35,43 @@
 # define __close(f)		close ((f))
 #endif
 
+int getservport(u_long number, const char *proto)
+{
+	char rpcdata[1024], servdata[1024];
+	struct rpcent rpcbuf, *rpcp;
+	struct servent servbuf, *servp = NULL;
+	int ret;
+
+	ret = getrpcbynumber_r(number, &rpcbuf, rpcdata, sizeof rpcdata,
+				&rpcp);
+	if (ret == 0 && rpcp != NULL) {
+		/* First try name.  */
+		ret = getservbyname_r(rpcp->r_name, proto, &servbuf, servdata,
+					sizeof servdata, &servp);
+		if ((ret != 0 || servp == NULL) && rpcp->r_aliases) {
+			const char **a;
+
+			/* Then we try aliases.  */
+			for (a = (const char **) rpcp->r_aliases; *a != NULL; a++) {
+				ret = getservbyname_r(*a, proto, &servbuf, servdata,
+							sizeof servdata, &servp);
+				if (ret == 0 && servp != NULL)
+					break;
+			}
+		}
+	}
+
+	if (ret == 0 && servp != NULL)
+		return ntohs(servp->s_port);
+
+	return 0;
+}
+
 static int
 svc_socket (u_long number, int type, int protocol, int reuse)
 {
   struct sockaddr_in addr;
   socklen_t len = sizeof (struct sockaddr_in);
-  char rpcdata [1024], servdata [1024];
-  struct rpcent rpcbuf, *rpcp;
-  struct servent servbuf, *servp = NULL;
   int sock, ret;
   const char *proto = protocol == IPPROTO_TCP ? "tcp" : "udp";
 
@@ -66,48 +95,13 @@ svc_socket (u_long number, int type, int protocol, int reuse)
 
   memset (&addr, 0, sizeof (addr));
   addr.sin_family = AF_INET;
+  addr.sin_port = htons(getservport(number, proto));
 
-  ret = getrpcbynumber_r (number, &rpcbuf, rpcdata, sizeof rpcdata,
-			  &rpcp);
-  if (ret == 0 && rpcp != NULL)
-    {
-      /* First try name.  */
-      ret = getservbyname_r (rpcp->r_name, proto, &servbuf, servdata,
-			     sizeof servdata, &servp);
-      if ((ret != 0 || servp == NULL) && rpcp->r_aliases)
-	{
-	  const char **a;
-
-	  /* Then we try aliases.  */
-	  for (a = (const char **) rpcp->r_aliases; *a != NULL; a++) 
-	    {
-	      ret = getservbyname_r (*a, proto, &servbuf, servdata,
-				     sizeof servdata, &servp);
-	      if (ret == 0 && servp != NULL)
-		break;
-	    }
-	}
-    }
-
-  if (ret == 0 && servp != NULL)
+  if (bind(sock, (struct sockaddr *) &addr, len) < 0)
     {
-      addr.sin_port = servp->s_port;
-      if (bind (sock, (struct sockaddr *) &addr, len) < 0)
-	{
-	  perror (_("svc_socket: bind problem"));
-	  (void) __close (sock);
-	  sock = -1;
-	}
-    }
-  else
-    {
-	  addr.sin_port = 0;
-	  if (bind (sock, (struct sockaddr *) &addr, len) < 0)
-	    {
-	      perror (_("svc_socket: bind problem"));
-	      (void) __close (sock);
-	      sock = -1;
-	    }
+      perror (_("svc_socket: bind problem"));
+      (void) __close(sock);
+      sock = -1;
     }
 
   if (sock >= 0)
diff --git a/utils/mountd/mountd.man b/utils/mountd/mountd.man
index 016a357..b60dc90 100644
--- a/utils/mountd/mountd.man
+++ b/utils/mountd/mountd.man
@@ -122,7 +122,10 @@ Ignored (compatibility with unfsd??).
 Specifies the port number used for RPC listener sockets.
 If this option is not specified,
 .B rpc.mountd
-chooses a random ephemeral port for each listener socket.
+will try to consult
+.IR /etc/services ,
+if gets port succeed, set the same port for all listener socket,
+otherwise chooses a random ephemeral port for each listener socket.
 .IP
 This option can be used to fix the port value of
 .BR rpc.mountd 's
diff --git a/utils/statd/statd.man b/utils/statd/statd.man
index b72236c..203f8c9 100644
--- a/utils/statd/statd.man
+++ b/utils/statd/statd.man
@@ -219,7 +219,10 @@ for details.
 Specifies the port number used for RPC listener sockets.
 If this option is not specified,
 .B rpc.statd
-chooses a random ephemeral port for each listener socket.
+will try to consult
+.IR /etc/services ,
+if gets port succeed, set the same port for all listener socket,
+otherwise chooses a random ephemeral port for each listener socket.
 .IP
 This option can be used to fix the port value of its listeners when
 SM_NOTIFY requests must traverse a firewall between clients and servers.