mount command: full support for AF_INET6 addresses in probe_port()
authorChuck Lever <chuck.lever@oracle.com>
Thu, 11 Dec 2008 15:27:34 +0000 (10:27 -0500)
committerSteve Dickson <steved@redhat.com>
Thu, 11 Dec 2008 15:27:34 +0000 (10:27 -0500)
Now that probe_port() uses an AF_INET6-capable rpcbind query and RPC ping,
finish updating probe_port() to support AF_INET6 addresses fully.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
utils/mount/network.c

index 0c68993..e50bc28 100644 (file)
@@ -160,6 +160,21 @@ static const unsigned long probe_mnt3_first[] = {
        0,
 };
 
+static void nfs_set_port(struct sockaddr *sap, const unsigned short port)
+{
+       switch (sap->sa_family) {
+       case AF_INET:
+               ((struct sockaddr_in *)sap)->sin_port = htons(port);
+               break;
+       case AF_INET6:
+               ((struct sockaddr_in6 *)sap)->sin6_port = htons(port);
+               break;
+       default:
+               nfs_error(_("%s: unrecognized address family in %s"),
+                       progname, __func__);
+       }
+}
+
 /**
  * nfs_name_to_address - resolve hostname to an IPv4 or IPv6 socket address
  * @hostname: pointer to C string containing DNS hostname to resolve
@@ -474,27 +489,38 @@ static void nfs_pp_debug(const struct sockaddr *sap, const socklen_t salen,
  * 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)
 {
-       const struct sockaddr *saddr = (struct sockaddr *)&server->saddr;
-       const socklen_t salen = sizeof(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 = nfs_getport(saddr, salen, prog, *p_vers, *p_prot);
                if (p_port) {
                        if (!port || port == p_port) {
-                               server->saddr.sin_port = htons(p_port);
+                               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,
@@ -537,28 +563,36 @@ out_ok:
 
 static int probe_nfsport(clnt_addr_t *nfs_server)
 {
+       struct sockaddr *sap = (struct sockaddr *)&nfs_server->saddr;
+       socklen_t salen = sizeof(nfs_server->saddr);
        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)
 {
+       struct sockaddr *sap = (struct sockaddr *)&mnt_server->saddr;
+       socklen_t salen = sizeof(mnt_server->saddr);
        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);
 }
 
 /**