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-rw-r--r--source3/Makefile.in2
-rw-r--r--source3/lib/util_str.c12
-rw-r--r--source3/libsmb/namecache.c252
-rw-r--r--source3/libsmb/namequery.c28
-rw-r--r--source3/nsswitch/winbindd.c2
-rw-r--r--source3/param/loadparm.c6
-rw-r--r--source3/smbd/server.c2
7 files changed, 299 insertions, 5 deletions
diff --git a/source3/Makefile.in b/source3/Makefile.in
index b96ce8b143..696a80c412 100644
--- a/source3/Makefile.in
+++ b/source3/Makefile.in
@@ -166,7 +166,7 @@ LIBSMB_OBJ = libsmb/clientgen.o libsmb/cliconnect.o libsmb/clifile.o \
libsmb/smberr.o libsmb/credentials.o libsmb/pwd_cache.o \
libsmb/clioplock.o libsmb/errormap.o libsmb/clirap2.o \
libsmb/passchange.o libsmb/unexpected.o libsmb/doserr.o \
- $(RPC_PARSE_OBJ1)
+ libsmb/namecache.o $(RPC_PARSE_OBJ1)
LIBMSRPC_OBJ = rpc_client/cli_lsarpc.o rpc_client/cli_samr.o \
rpc_client/cli_netlogon.o rpc_client/cli_srvsvc.o \
diff --git a/source3/lib/util_str.c b/source3/lib/util_str.c
index 9dc80c89db..3b5ceb2217 100644
--- a/source3/lib/util_str.c
+++ b/source3/lib/util_str.c
@@ -212,6 +212,18 @@ int strwicmp(const char *psz1, const char *psz2)
}
+/* Convert a string to upper case, but don't modify it */
+
+char *strupper_static(char *s)
+{
+ static pstring str;
+
+ pstrcpy(str, s);
+ strupper(str);
+
+ return str;
+}
+
/*******************************************************************
convert a string to "normal" form
********************************************************************/
diff --git a/source3/libsmb/namecache.c b/source3/libsmb/namecache.c
new file mode 100644
index 0000000000..fc09d8eac2
--- /dev/null
+++ b/source3/libsmb/namecache.c
@@ -0,0 +1,252 @@
+/*
+ Unix SMB/CIFS implementation.
+
+ NetBIOS name cache module.
+
+ Copyright (C) Tim Potter, 2002
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+static BOOL done_namecache_init;
+static BOOL enable_namecache;
+static TDB_CONTEXT *namecache_tdb;
+
+struct nc_value {
+ time_t expiry; /* When entry expires */
+ int count; /* Number of addresses */
+ struct in_addr ip_list[0]; /* Address list */
+};
+
+/* Initialise namecache system */
+
+void namecache_enable(void)
+{
+ /* Check if we have been here before, or name caching disabled
+ by setting the name cache timeout to zero. */
+
+ if (done_namecache_init)
+ return;
+
+ done_namecache_init = True;
+
+ if (lp_name_cache_timeout() == 0) {
+ DEBUG(5, ("namecache_init: disabling netbios name cache\n"));
+ return;
+ }
+
+ /* Open namecache tdb in read/write or readonly mode */
+
+ namecache_tdb = tdb_open_log(
+ lock_path("namecache.tdb"), 0,
+ TDB_DEFAULT, O_RDWR | O_CREAT, 0644);
+
+ if (!namecache_tdb) {
+ DEBUG(5, ("namecache_init: could not open %s\n",
+ lock_path("namecache.tdb")));
+ return;
+ }
+
+ DEBUG(5, ("namecache_init: enabling netbios namecache, timeout %d "
+ "seconds\n", lp_name_cache_timeout()));
+
+ enable_namecache = True;
+}
+
+/* Return a key for a name and name type. The caller must free
+ retval.dptr when finished. */
+
+static TDB_DATA namecache_key(const char *name, int name_type)
+{
+ TDB_DATA retval;
+ char *keystr;
+
+ asprintf(&keystr, "%s#%02X", strupper_static(name), name_type);
+
+ retval.dsize = strlen(keystr) + 1;
+ retval.dptr = keystr;
+
+ return retval;
+}
+
+/* Return a data value for an IP list. The caller must free
+ retval.dptr when finished. */
+
+static TDB_DATA namecache_value(struct in_addr *ip_list, int num_names,
+ time_t expiry)
+{
+ TDB_DATA retval;
+ struct nc_value *value;
+ int size;
+
+ size = sizeof(struct nc_value) + sizeof(struct in_addr) *
+ num_names;
+
+ value = (struct nc_value *)malloc(size);
+
+ value->expiry = expiry;
+ value->count = num_names;
+
+ memcpy(value->ip_list, ip_list, num_names * sizeof(struct in_addr));
+
+ retval.dptr = (char *)value;
+ retval.dsize = size;
+
+ return retval;
+}
+
+/* Store a name in the name cache */
+
+void namecache_store(const char *name, int name_type,
+ int num_names, struct in_addr *ip_list)
+{
+ TDB_DATA key, value;
+ time_t expiry;
+ int i;
+
+ if (!enable_namecache)
+ return;
+
+ DEBUG(5, ("namecache_store: storing %d address%s for %s#%02x: ",
+ num_names, num_names == 1 ? "": "es", name, name_type));
+
+ for (i = 0; i < num_names; i++)
+ DEBUGADD(5, ("%s%s", inet_ntoa(ip_list[i]),
+ i == (num_names - 1) ? "" : ", "));
+
+ DEBUGADD(5, ("\n"));
+
+ key = namecache_key(name, name_type);
+
+ /* Cache pdc location or dc lists for only a little while
+ otherwise if we lock on to a bad DC we can potentially be
+ out of action for the entire cache timeout time! */
+
+ if (name_type != 0x1b || name_type != 0x1c)
+ expiry = time(NULL) + 10;
+ else
+ expiry = time(NULL) + lp_name_cache_timeout();
+
+ value = namecache_value(ip_list, num_names, expiry);
+
+ tdb_store(namecache_tdb, key, value, TDB_REPLACE);
+
+ free(key.dptr);
+ free(value.dptr);
+}
+
+/* Look up a name in the name cache. Return a mallocated list of IP
+ addresses if the name is contained in the cache. */
+
+BOOL namecache_fetch(const char *name, int name_type, struct in_addr **ip_list,
+ int *num_names)
+{
+ TDB_DATA key, value;
+ struct nc_value *data;
+ time_t now;
+ int i;
+
+ if (!enable_namecache)
+ return False;
+
+ /* Read value */
+
+ key = namecache_key(name, name_type);
+
+ value = tdb_fetch(namecache_tdb, key);
+
+ if (!value.dptr) {
+ DEBUG(5, ("namecache_fetch: %s#%02x not found\n",
+ name, name_type));
+ goto done;
+ }
+
+ data = (struct nc_value *)value.dptr;
+
+ /* Check expiry time */
+
+ now = time(NULL);
+
+ if (now > data->expiry) {
+
+ DEBUG(5, ("namecache_fetch: entry for %s#%02x expired\n",
+ name, name_type));
+
+ tdb_delete(namecache_tdb, key);
+
+ value = tdb_null;
+
+ goto done;
+ }
+
+ if ((data->expiry - now) > lp_name_cache_timeout()) {
+
+ /* Someone may have changed the system time on us */
+
+ DEBUG(5, ("namecache_fetch: entry for %s#%02x has bad expiry\n",
+ name, name_type));
+
+ tdb_delete(namecache_tdb, key);
+
+ value = tdb_null;
+
+ goto done;
+ }
+
+ /* Extract and return namelist */
+
+ *ip_list = (struct in_addr *)malloc(
+ sizeof(struct in_addr) * data->count);
+
+ memcpy(*ip_list, data->ip_list, sizeof(struct in_addr) *
+ data->count);
+
+ *num_names = data->count;
+
+ DEBUG(5, ("namecache_fetch: returning %d address%s for %s#%02x: ",
+ *num_names, *num_names == 1 ? "" : "es", name, name_type));
+
+ for (i = 0; i < *num_names; i++)
+ DEBUGADD(5, ("%s%s", inet_ntoa((*ip_list)[i]),
+ i == (*num_names - 1) ? "" : ", "));
+
+ DEBUGADD(5, ("\n"));
+
+done:
+ SAFE_FREE(key.dptr);
+ SAFE_FREE(value.dptr);
+
+ return value.dsize > 0;
+}
+
+/* Flush all names from the name cache */
+
+void namecache_flush(void)
+{
+ int result;
+
+ if (!namecache_tdb)
+ return;
+
+ result = tdb_traverse(namecache_tdb, tdb_traverse_delete_fn, NULL);
+
+ if (result == -1)
+ DEBUG(5, ("namecache_flush: error deleting cache entries\n"));
+ else
+ DEBUG(5, ("namecache_flush: deleted %d cache entr%s\n",
+ result, result == 1 ? "y" : "ies"));
+}
diff --git a/source3/libsmb/namequery.c b/source3/libsmb/namequery.c
index 3382ce4f4a..40a353fa8b 100644
--- a/source3/libsmb/namequery.c
+++ b/source3/libsmb/namequery.c
@@ -783,7 +783,7 @@ static BOOL resolve_hosts(const char *name,
*********************************************************/
static BOOL internal_resolve_name(const char *name, int name_type,
- struct in_addr **return_iplist, int *return_count)
+ struct in_addr **return_iplist, int *return_count)
{
pstring name_resolve_list;
fstring tok;
@@ -816,6 +816,15 @@ static BOOL internal_resolve_name(const char *name, int name_type,
return True;
}
+ /* Check netbios name cache */
+
+ if (namecache_fetch(name, name_type, return_iplist, return_count)) {
+
+ /* This could be a negative response */
+
+ return (*return_count > 0);
+ }
+
pstrcpy(name_resolve_list, lp_name_resolve_order());
ptr = name_resolve_list;
if (!ptr || !*ptr)
@@ -823,9 +832,16 @@ static BOOL internal_resolve_name(const char *name, int name_type,
while (next_token(&ptr, tok, LIST_SEP, sizeof(tok))) {
if((strequal(tok, "host") || strequal(tok, "hosts"))) {
- if (name_type == 0x20 && resolve_hosts(name, return_iplist, return_count)) {
- result = True;
- goto done;
+ if (name_type == 0x20) {
+ if (resolve_hosts(name, return_iplist, return_count)) {
+ result = True;
+ goto done;
+ } else {
+
+ /* Store negative lookup result */
+
+ namecache_store(name, name_type, 0, NULL);
+ }
}
} else if(strequal( tok, "lmhosts")) {
if (resolve_lmhosts(name, name_type, return_iplist, return_count)) {
@@ -897,6 +913,10 @@ static BOOL internal_resolve_name(const char *name, int name_type,
*return_iplist = nodupes_iplist;
*return_count = nodupes_count;
}
+
+ /* Save in name cache */
+
+ namecache_store(name, name_type, *return_count, *return_iplist);
/* Display some debugging info */
diff --git a/source3/nsswitch/winbindd.c b/source3/nsswitch/winbindd.c
index 047ea1accc..256c0203c0 100644
--- a/source3/nsswitch/winbindd.c
+++ b/source3/nsswitch/winbindd.c
@@ -691,6 +691,8 @@ int winbind_setup_common(void)
}
+ namecache_enable(); /* Enable netbios namecache */
+
/* Get list of domains we look up requests for. This includes the
domain which we are a member of as well as any trusted
domains. */
diff --git a/source3/param/loadparm.c b/source3/param/loadparm.c
index 0967134b9b..9e4ce615e8 100644
--- a/source3/param/loadparm.c
+++ b/source3/param/loadparm.c
@@ -260,6 +260,7 @@ typedef struct
BOOL bUnixExtensions;
BOOL bDisableNetbios;
int restrict_anonymous;
+ int name_cache_timeout;
}
global;
@@ -838,6 +839,8 @@ static struct parm_struct parm_table[] = {
{"hostname lookups", P_BOOL, P_GLOBAL, &Globals.bHostnameLookups, NULL, NULL, 0},
{"write cache size", P_INTEGER, P_LOCAL, &sDefault.iWriteCacheSize, NULL, NULL, FLAG_SHARE},
+ {"name cache timeout", P_INTEGER, P_GLOBAL, &Globals.name_cache_timeout, NULL, NULL, 0},
+
{"Printing Options", P_SEP, P_SEPARATOR},
{"total print jobs", P_INTEGER, P_GLOBAL, &Globals.iTotalPrintJobs, NULL, NULL, FLAG_PRINT},
@@ -1375,6 +1378,8 @@ static void init_globals(void)
Globals.bWinbindEnumGroups = True;
Globals.bWinbindUseDefaultDomain = False;
+ Globals.name_cache_timeout = 660; /* In seconds */
+
Globals.bUseSpnego = True;
string_set(&Globals.smb_ports, SMB_PORTS);
@@ -1740,6 +1745,7 @@ FN_LOCAL_CHAR(lp_magicchar, magic_char)
FN_GLOBAL_INTEGER(lp_winbind_cache_time, &Globals.winbind_cache_time)
FN_GLOBAL_BOOL(lp_hide_local_users, &Globals.bHideLocalUsers)
FN_GLOBAL_BOOL(lp_algorithmic_rid_base, &Globals.bAlgorithmicRidBase)
+FN_GLOBAL_INTEGER(lp_name_cache_timeout, &Globals.name_cache_timeout)
typedef struct _param_opt_struct param_opt_struct;
struct _param_opt_struct {
diff --git a/source3/smbd/server.c b/source3/smbd/server.c
index 45295896e8..41b55b9622 100644
--- a/source3/smbd/server.c
+++ b/source3/smbd/server.c
@@ -881,6 +881,8 @@ static void usage(char *pname)
* everything after this point is run after the fork()
*/
+ namecache_enable();
+
if (!locking_init(0))
exit(1);
generated by cgit (git 2.34.1) at 2024-07-20 00:29:01 +0000