mountd: eliminate a spurious compiler warning

[nfs-utils.git] / utils / mountd / auth.c

diff --git a/utils/mountd/auth.c b/utils/mountd/auth.c
index 84fea30d8415f85e55568e442c78e4a011a372f6..3c9a89a94dcdc7de5f76e175909ebf770c0d3304 100644 (file)
--- a/utils/mountd/auth.c
+++ b/utils/mountd/auth.c
@@ -37,6 +37,7 @@ static nfs_export my_exp;
 static nfs_client my_client;
 
 extern int new_cache;
+extern int use_ipaddr;
 
 void
 auth_init(char *exports)
@@ -47,6 +48,34 @@ auth_init(char *exports)
        xtab_mount_write();
 }
 
+/*
+ * A client can match many different netgroups and it's tough to know
+ * beforehand whether it will. If the concatenated string of netgroup
+ * m_hostnames is >512 bytes, then enable the "use_ipaddr" mode. This
+ * makes mountd change how it matches a client ip address when a mount
+ * request comes in. It's more efficient at handling netgroups at the
+ * expense of larger kernel caches.
+ */
+static void
+check_useipaddr(void)
+{
+       nfs_client *clp;
+       int old_use_ipaddr = use_ipaddr;
+       unsigned int len = 0;
+
+       /* add length of m_hostname + 1 for the comma */
+       for (clp = clientlist[MCL_NETGROUP]; clp; clp = clp->m_next)
+               len += (strlen(clp->m_hostname) + 1);
+
+       if (len > (NFSCLNT_IDMAX / 2))
+               use_ipaddr = 1;
+       else
+               use_ipaddr = 0;
+
+       if (use_ipaddr != old_use_ipaddr)
+               cache_flush(1);
+}
+
 unsigned int
 auth_reload()
 {
@@ -72,6 +101,7 @@ auth_reload()
        export_freeall();
        memset(&my_client, 0, sizeof(my_client));
        xtab_export_read();
+       check_useipaddr();
        ++counter;
 
        return counter;
@@ -88,28 +118,37 @@ auth_authenticate_internal(char *what, struct sockaddr_in *caller,
                int i;
                /* return static nfs_export with details filled in */
                char *n;
-               my_client.m_addrlist[0] = caller->sin_addr;
-               n = client_compose(hp);
-               *error = unknown_host;
-               if (!n)
-                       return NULL;
                free(my_client.m_hostname);
-               if (*n) {
-                       my_client.m_hostname = n;
+               if (use_ipaddr) {
+                       my_client.m_hostname =
+                               strdup(inet_ntoa(caller->sin_addr));
                } else {
-                       free(n);
-                       my_client.m_hostname = xstrdup("DEFAULT");
+                       n = client_compose(hp);
+                       *error = unknown_host;
+                       if (!n)
+                               my_client.m_hostname = NULL;
+                       else if (*n)
+                               my_client.m_hostname = n;
+                       else {
+                               free(n);
+                               my_client.m_hostname = strdup("DEFAULT");
+                       }
                }
+               if (my_client.m_hostname == NULL)
+                       return NULL;
                my_client.m_naddr = 1;
+               my_client.m_addrlist[0] = caller->sin_addr;
                my_exp.m_client = &my_client;
 
                exp = NULL;
                for (i = 0; !exp && i < MCL_MAXTYPES; i++) 
                        for (exp = exportlist[i]; exp; exp = exp->m_next) {
-                               if (!client_member(my_client.m_hostname, exp->m_client->m_hostname))
-                                       continue;
                                if (strcmp(path, exp->m_export.e_path))
                                        continue;
+                               if (!use_ipaddr && !client_member(my_client.m_hostname, exp->m_client->m_hostname))
+                                       continue;
+                               if (use_ipaddr && !client_check(exp->m_client, hp))
+                                       continue;
                                break;
                        }
                *error = not_exported;