+ option = po_get(options, "mountaddr");
+ if (option == NULL) {
+ memcpy(mnt_saddr, nfs_saddr, *nfs_salen);
+ *mnt_salen = *nfs_salen;
+ } else if (!nfs_string_to_sockaddr(option, strlen(option),
+ mnt_saddr, mnt_salen))
+ return 0;
+
+ return 1;
+}
+
+static int nfs_construct_new_options(struct mount_options *options,
+ struct pmap *nfs_pmap,
+ struct pmap *mnt_pmap)
+{
+ char new_option[64];
+
+ po_remove_all(options, "nfsprog");
+ po_remove_all(options, "mountprog");
+
+ po_remove_all(options, "v2");
+ po_remove_all(options, "v3");
+ po_remove_all(options, "vers");
+ po_remove_all(options, "nfsvers");
+ snprintf(new_option, sizeof(new_option) - 1,
+ "vers=%lu", nfs_pmap->pm_vers);
+ if (po_append(options, new_option) == PO_FAILED)
+ return 0;
+
+ po_remove_all(options, "proto");
+ po_remove_all(options, "udp");
+ po_remove_all(options, "tcp");
+ switch (nfs_pmap->pm_prot) {
+ case IPPROTO_TCP:
+ snprintf(new_option, sizeof(new_option) - 1,
+ "proto=tcp");
+ if (po_append(options, new_option) == PO_FAILED)
+ return 0;
+ break;
+ case IPPROTO_UDP:
+ snprintf(new_option, sizeof(new_option) - 1,
+ "proto=udp");
+ if (po_append(options, new_option) == PO_FAILED)
+ return 0;
+ break;
+ }
+
+ po_remove_all(options, "port");
+ if (nfs_pmap->pm_port != NFS_PORT) {
+ snprintf(new_option, sizeof(new_option) - 1,
+ "port=%lu", nfs_pmap->pm_port);
+ if (po_append(options, new_option) == PO_FAILED)
+ return 0;
+ }
+
+ po_remove_all(options, "mountvers");
+ snprintf(new_option, sizeof(new_option) - 1,
+ "mountvers=%lu", mnt_pmap->pm_vers);
+ if (po_append(options, new_option) == PO_FAILED)
+ return 0;
+
+ po_remove_all(options, "mountproto");
+ switch (mnt_pmap->pm_prot) {
+ case IPPROTO_TCP:
+ snprintf(new_option, sizeof(new_option) - 1,
+ "mountproto=tcp");
+ if (po_append(options, new_option) == PO_FAILED)
+ return 0;
+ break;
+ case IPPROTO_UDP:
+ snprintf(new_option, sizeof(new_option) - 1,
+ "mountproto=udp");
+ if (po_append(options, new_option) == PO_FAILED)
+ return 0;
+ break;
+ }
+
+ po_remove_all(options, "mountport");
+ snprintf(new_option, sizeof(new_option) - 1,
+ "mountport=%lu", mnt_pmap->pm_port);
+ if (po_append(options, new_option) == PO_FAILED)
+ return 0;
+
+ return 1;
+}
+
+/*
+ * Reconstruct the mount option string based on a portmapper probe
+ * of the server. Returns one if the server's portmapper returned
+ * something we can use, otherwise zero.
+ *
+ * To handle version and transport protocol fallback properly, we
+ * need to parse some of the mount options in order to set up a
+ * portmap probe. Mount options that nfs_rewrite_mount_options()
+ * doesn't recognize are left alone.
+ *
+ * Returns a new group of mount options if successful; otherwise
+ * NULL is returned if some failure occurred.
+ */
+static struct mount_options *nfs_rewrite_mount_options(char *str)
+{
+ struct mount_options *options;
+ struct sockaddr_storage nfs_address;
+ struct sockaddr *nfs_saddr = (struct sockaddr *)&nfs_address;
+ socklen_t nfs_salen;
+ struct pmap nfs_pmap;
+ struct sockaddr_storage mnt_address;
+ struct sockaddr *mnt_saddr = (struct sockaddr *)&mnt_address;
+ socklen_t mnt_salen;
+ struct pmap mnt_pmap;
+ char *option;
+
+ options = po_split(str);