#include "includes.h"
-/*
- find the DC for a domain using methods appropriate for a RPC domain
-*/
+#define FAILED_CONNECTION_CACHE_TIMEOUT 30 /* Seconds between attempts */
+
+struct failed_connection_cache {
+ fstring domain_name;
+ fstring controller;
+ time_t lookup_time;
+ NTSTATUS nt_status;
+ struct failed_connection_cache *prev, *next;
+};
+
+static struct failed_connection_cache *failed_connection_cache;
+
+/**********************************************************************
+ Check for a previously failed connection
+**********************************************************************/
+
+static NTSTATUS check_negative_conn_cache( const char *domain, const char *server )
+{
+ struct failed_connection_cache *fcc;
+ NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
+
+ /* can't check if we don't have strings */
+
+ if ( !domain || !server )
+ return NT_STATUS_OK;
+
+ for (fcc = failed_connection_cache; fcc; fcc = fcc->next) {
+
+ /*
+ * we have a match IFF the domain and server name matches
+ * (a) the domain matches,
+ * (b) the IP address matches (if we have one)
+ * (c) the server name (if specified) matches
+ */
+
+ if ( !strequal(domain, fcc->domain_name) || !strequal(server, fcc->controller) )
+ continue; /* no match; check the next entry */
+
+ /* we have a match so see if it is still current */
+
+ if ((time(NULL) - fcc->lookup_time) > FAILED_CONNECTION_CACHE_TIMEOUT)
+ {
+ /* Cache entry has expired, delete it */
+
+ DEBUG(10, ("check_negative_conn_cache: cache entry expired for %s, %s\n",
+ domain, server ));
+
+ DLIST_REMOVE(failed_connection_cache, fcc);
+ SAFE_FREE(fcc);
+
+ return NT_STATUS_OK;
+ }
+
+ /* The timeout hasn't expired yet so return false */
+
+ DEBUG(10, ("check_negative_conn_cache: returning negative entry for %s, %s\n",
+ domain, server ));
+
+ result = fcc->nt_status;
+ return result;
+ }
+
+ /* end of function means no cache entry */
+ return NT_STATUS_OK;
+}
+
+/**********************************************************************
+ Add an entry to the failed conneciton cache
+**********************************************************************/
+
+void add_failed_connection_entry(const char *domain, const char *server, NTSTATUS result)
+{
+ struct failed_connection_cache *fcc;
+
+ SMB_ASSERT(!NT_STATUS_IS_OK(result));
+
+ /* Check we already aren't in the cache. We always have to have
+ a domain, but maybe not a specific DC name. */
+
+ for (fcc = failed_connection_cache; fcc; fcc = fcc->next) {
+ if ( strequal(fcc->domain_name, domain) && strequal(fcc->controller, server) )
+ {
+ DEBUG(10, ("add_failed_connection_entry: domain %s (%s) already tried and failed\n",
+ domain, server ));
+ return;
+ }
+ }
+
+ /* Create negative lookup cache entry for this domain and controller */
+
+ if ( !(fcc = (struct failed_connection_cache *)malloc(sizeof(struct failed_connection_cache))) )
+ {
+ DEBUG(0, ("malloc failed in add_failed_connection_entry!\n"));
+ return;
+ }
+
+ ZERO_STRUCTP(fcc);
+
+ fstrcpy( fcc->domain_name, domain );
+ fstrcpy( fcc->controller, server );
+ fcc->lookup_time = time(NULL);
+ fcc->nt_status = result;
+
+ DEBUG(10,("add_failed_connection_entry: added domain %s (%s) to failed conn cache\n",
+ domain, server ));
+
+ DLIST_ADD(failed_connection_cache, fcc);
+}
+
+/****************************************************************************
+****************************************************************************/
+
+void flush_negative_conn_cache( void )
+{
+ struct failed_connection_cache *fcc;
+
+ fcc = failed_connection_cache;
+
+ while (fcc) {
+ struct failed_connection_cache *fcc_next;
+
+ fcc_next = fcc->next;
+ DLIST_REMOVE(failed_connection_cache, fcc);
+ free(fcc);
+
+ fcc = fcc_next;
+ }
+
+}
+
+/****************************************************************************
+ Utility function to return the name of a DC using RPC. The name is
+ guaranteed to be valid since we have already done a name_status_find on it
+ and we have checked our negative connection cache
+ ***************************************************************************/
+
BOOL rpc_find_dc(const char *domain, fstring srv_name, struct in_addr *ip_out)
{
struct in_addr *ip_list = NULL, dc_ip, exclude_ip;
int count, i;
BOOL list_ordered;
BOOL use_pdc_only;
+ NTSTATUS result;
zero_ip(&exclude_ip);
/* Lookup domain controller name */
- if ( use_pdc_only && get_pdc_ip(domain, &dc_ip) ) {
+ if ( use_pdc_only && get_pdc_ip(domain, &dc_ip) )
+ {
DEBUG(10,("rpc_find_dc: Atempting to lookup PDC to avoid sam sync delays\n"));
if (name_status_find(domain, 0x1c, 0x20, dc_ip, srv_name)) {
- goto done;
+ /* makre we we haven't tried this on previously and failed */
+ result = check_negative_conn_cache( domain, srv_name );
+ if ( NT_STATUS_IS_OK(result) )
+ goto done;
}
/* Didn't get name, remember not to talk to this DC. */
exclude_ip = dc_ip;
continue;
if (name_status_find(domain, 0x1c, 0x20, ip_list[i], srv_name)) {
- dc_ip = ip_list[i];
- goto done;
+ result = check_negative_conn_cache( domain, srv_name );
+ if ( NT_STATUS_IS_OK(result) ) {
+ dc_ip = ip_list[i];
+ goto done;
+ }
}
}
}
}
-/* Open a new smb pipe connection to a DC on a given domain. Cache
- negative creation attempts so we don't try and connect to broken
- machines too often. */
-
-#define FAILED_CONNECTION_CACHE_TIMEOUT 30 /* Seconds between attempts */
-
-struct failed_connection_cache {
- fstring domain_name;
- fstring controller;
- time_t lookup_time;
- NTSTATUS nt_status;
- struct failed_connection_cache *prev, *next;
-};
-
-static struct failed_connection_cache *failed_connection_cache;
-
-/* Add an entry to the failed conneciton cache */
-
-static void add_failed_connection_entry(struct winbindd_cm_conn *new_conn,
- NTSTATUS result)
-{
- struct failed_connection_cache *fcc;
-
- SMB_ASSERT(!NT_STATUS_IS_OK(result));
-
- /* Check we already aren't in the cache */
-
- for (fcc = failed_connection_cache; fcc; fcc = fcc->next) {
- if (strequal(fcc->domain_name, new_conn->domain)) {
- DEBUG(10, ("domain %s already tried and failed\n",
- fcc->domain_name));
- return;
- }
- }
-
- /* Create negative lookup cache entry for this domain and controller */
-
- if (!(fcc = (struct failed_connection_cache *)
- malloc(sizeof(struct failed_connection_cache)))) {
- DEBUG(0, ("malloc failed in add_failed_connection_entry!\n"));
- return;
- }
-
- ZERO_STRUCTP(fcc);
-
- fstrcpy(fcc->domain_name, new_conn->domain);
- fstrcpy(fcc->controller, new_conn->controller);
- fcc->lookup_time = time(NULL);
- fcc->nt_status = result;
-
- DLIST_ADD(failed_connection_cache, fcc);
-}
-
/* Open a connction to the remote server, cache failures for 30 seconds */
static NTSTATUS cm_open_connection(const char *domain, const int pipe_index,
struct winbindd_cm_conn *new_conn)
{
- struct failed_connection_cache *fcc;
NTSTATUS result;
char *ipc_username, *ipc_domain, *ipc_password;
struct in_addr dc_ip;
fstrcpy(new_conn->domain, domain);
fstrcpy(new_conn->pipe_name, get_pipe_name_from_index(pipe_index));
- /* Look for a domain controller for this domain. Negative results
- are cached so don't bother applying the caching for this
- function just yet. */
+ /* connection failure cache has been moved inside of get_dc_name
+ so we can deal with half dead DC's --jerry */
if (!cm_get_dc_name(domain, new_conn->controller, &dc_ip)) {
result = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
- add_failed_connection_entry(new_conn, result);
+ add_failed_connection_entry(domain, "", result);
return result;
}
- /* Return false if we have tried to look up this domain and netbios
- name before and failed. */
-
- for (fcc = failed_connection_cache; fcc; fcc = fcc->next) {
-
- if (!(strequal(domain, fcc->domain_name) &&
- strequal(new_conn->controller, fcc->controller)))
- continue; /* Not our domain */
-
- if ((time(NULL) - fcc->lookup_time) >
- FAILED_CONNECTION_CACHE_TIMEOUT) {
-
- /* Cache entry has expired, delete it */
-
- DEBUG(10, ("cm_open_connection cache entry expired for %s, %s\n", domain, new_conn->controller));
-
- DLIST_REMOVE(failed_connection_cache, fcc);
- free(fcc);
-
- break;
- }
-
- /* The timeout hasn't expired yet so return false */
-
- DEBUG(10, ("returning negative open_connection_cache entry for %s, %s\n", domain, new_conn->controller));
-
- result = fcc->nt_status;
- SMB_ASSERT(!NT_STATUS_IS_OK(result));
- return result;
- }
-
/* Initialise SMB connection */
cm_get_ipc_userpass(&ipc_username, &ipc_domain, &ipc_password);
* specific UUID right now, i'm not going to bother. --jerry
*/
if ( !is_win2k_pipe(pipe_index) )
- add_failed_connection_entry(new_conn, result);
+ add_failed_connection_entry(domain, new_conn->controller, result);
cli_shutdown(new_conn->cli);
return result;
}
return &hnd;
}
-#if 0 /* This code now *well* out of date */
-
-/* Return a SAM domain policy handle on a domain */
-
-CLI_POLICY_HND *cm_get_sam_dom_handle(char *domain, DOM_SID *domain_sid)
-{
- struct winbindd_cm_conn *conn, *basic_conn = NULL;
- static CLI_POLICY_HND hnd;
- NTSTATUS result;
- uint32 des_access = SEC_RIGHTS_MAXIMUM_ALLOWED;
-
- /* Look for existing connections */
-
- for (conn = cm_conns; conn; conn = conn->next) {
- if (strequal(conn->domain, domain) &&
- strequal(conn->pipe_name, PIPE_SAMR) &&
- conn->pipe_data.samr.pipe_type == SAM_PIPE_DOM) {
-
- if (!connection_ok(conn)) {
- /* Shutdown cli? Free conn? Allow retry of DC? */
- DLIST_REMOVE(cm_conns, conn);
- return NULL;
- }
-
- goto ok;
- }
- }
-
- /* Create a basic handle to open a domain handle from */
-
- if (!cm_get_sam_handle(domain))
- return False;
-
- for (conn = cm_conns; conn; conn = conn->next) {
- if (strequal(conn->domain, domain) &&
- strequal(conn->pipe_name, PIPE_SAMR) &&
- conn->pipe_data.samr.pipe_type == SAM_PIPE_BASIC)
- basic_conn = conn;
- }
-
- if (!(conn = (struct winbindd_cm_conn *)
- malloc(sizeof(struct winbindd_cm_conn))))
- return NULL;
-
- ZERO_STRUCTP(conn);
-
- fstrcpy(conn->domain, basic_conn->domain);
- fstrcpy(conn->controller, basic_conn->controller);
- fstrcpy(conn->pipe_name, basic_conn->pipe_name);
-
- conn->pipe_data.samr.pipe_type = SAM_PIPE_DOM;
- conn->cli = basic_conn->cli;
-
- result = cli_samr_open_domain(conn->cli, conn->cli->mem_ctx,
- &basic_conn->pol, des_access,
- domain_sid, &conn->pol);
-
- if (!NT_STATUS_IS_OK(result))
- return NULL;
-
- /* Add to list */
-
- DLIST_ADD(cm_conns, conn);
-
- ok:
- hnd.pol = conn->pol;
- hnd.cli = conn->cli;
-
- return &hnd;
-}
-
-/* Return a SAM policy handle on a domain user */
-
-CLI_POLICY_HND *cm_get_sam_user_handle(char *domain, DOM_SID *domain_sid,
- uint32 user_rid)
-{
- struct winbindd_cm_conn *conn, *basic_conn = NULL;
- static CLI_POLICY_HND hnd;
- NTSTATUS result;
- uint32 des_access = SEC_RIGHTS_MAXIMUM_ALLOWED;
-
- /* Look for existing connections */
-
- for (conn = cm_conns; conn; conn = conn->next) {
- if (strequal(conn->domain, domain) &&
- strequal(conn->pipe_name, PIPE_SAMR) &&
- conn->pipe_data.samr.pipe_type == SAM_PIPE_USER &&
- conn->pipe_data.samr.rid == user_rid) {
-
- if (!connection_ok(conn)) {
- /* Shutdown cli? Free conn? Allow retry of DC? */
- DLIST_REMOVE(cm_conns, conn);
- return NULL;
- }
-
- goto ok;
- }
- }
-
- /* Create a domain handle to open a user handle from */
-
- if (!cm_get_sam_dom_handle(domain, domain_sid))
- return NULL;
-
- for (conn = cm_conns; conn; conn = conn->next) {
- if (strequal(conn->domain, domain) &&
- strequal(conn->pipe_name, PIPE_SAMR) &&
- conn->pipe_data.samr.pipe_type == SAM_PIPE_DOM)
- basic_conn = conn;
- }
-
- if (!basic_conn) {
- DEBUG(0, ("No domain sam handle was created!\n"));
- return NULL;
- }
-
- if (!(conn = (struct winbindd_cm_conn *)
- malloc(sizeof(struct winbindd_cm_conn))))
- return NULL;
-
- ZERO_STRUCTP(conn);
-
- fstrcpy(conn->domain, basic_conn->domain);
- fstrcpy(conn->controller, basic_conn->controller);
- fstrcpy(conn->pipe_name, basic_conn->pipe_name);
-
- conn->pipe_data.samr.pipe_type = SAM_PIPE_USER;
- conn->cli = basic_conn->cli;
- conn->pipe_data.samr.rid = user_rid;
-
- result = cli_samr_open_user(conn->cli, conn->cli->mem_ctx,
- &basic_conn->pol, des_access, user_rid,
- &conn->pol);
-
- if (!NT_STATUS_IS_OK(result))
- return NULL;
-
- /* Add to list */
-
- DLIST_ADD(cm_conns, conn);
-
- ok:
- hnd.pol = conn->pol;
- hnd.cli = conn->cli;
-
- return &hnd;
-}
-
-/* Return a SAM policy handle on a domain group */
-
-CLI_POLICY_HND *cm_get_sam_group_handle(char *domain, DOM_SID *domain_sid,
- uint32 group_rid)
-{
- struct winbindd_cm_conn *conn, *basic_conn = NULL;
- static CLI_POLICY_HND hnd;
- NTSTATUS result;
- uint32 des_access = SEC_RIGHTS_MAXIMUM_ALLOWED;
-
- /* Look for existing connections */
-
- for (conn = cm_conns; conn; conn = conn->next) {
- if (strequal(conn->domain, domain) &&
- strequal(conn->pipe_name, PIPE_SAMR) &&
- conn->pipe_data.samr.pipe_type == SAM_PIPE_GROUP &&
- conn->pipe_data.samr.rid == group_rid) {
-
- if (!connection_ok(conn)) {
- /* Shutdown cli? Free conn? Allow retry of DC? */
- DLIST_REMOVE(cm_conns, conn);
- return NULL;
- }
-
- goto ok;
- }
- }
-
- /* Create a domain handle to open a user handle from */
-
- if (!cm_get_sam_dom_handle(domain, domain_sid))
- return NULL;
-
- for (conn = cm_conns; conn; conn = conn->next) {
- if (strequal(conn->domain, domain) &&
- strequal(conn->pipe_name, PIPE_SAMR) &&
- conn->pipe_data.samr.pipe_type == SAM_PIPE_DOM)
- basic_conn = conn;
- }
-
- if (!basic_conn) {
- DEBUG(0, ("No domain sam handle was created!\n"));
- return NULL;
- }
-
- if (!(conn = (struct winbindd_cm_conn *)
- malloc(sizeof(struct winbindd_cm_conn))))
- return NULL;
-
- ZERO_STRUCTP(conn);
-
- fstrcpy(conn->domain, basic_conn->domain);
- fstrcpy(conn->controller, basic_conn->controller);
- fstrcpy(conn->pipe_name, basic_conn->pipe_name);
-
- conn->pipe_data.samr.pipe_type = SAM_PIPE_GROUP;
- conn->cli = basic_conn->cli;
- conn->pipe_data.samr.rid = group_rid;
-
- result = cli_samr_open_group(conn->cli, conn->cli->mem_ctx,
- &basic_conn->pol, des_access, group_rid,
- &conn->pol);
-
- if (!NT_STATUS_IS_OK(result))
- return NULL;
-
- /* Add to list */
-
- DLIST_ADD(cm_conns, conn);
-
- ok:
- hnd.pol = conn->pol;
- hnd.cli = conn->cli;
-
- return &hnd;
-}
-
-#endif
-
/* Get a handle on a netlogon pipe. This is a bit of a hack to re-use the
netlogon pipe as no handle is returned. */
git.samba.org / sfrench / samba-autobuild / .git / commitdiff