This commit was manufactured by cvs2svn to create branch 'SAMBA_3_0'.

source/libsmb/trustdom_cache.c

@@ -0,0 +1,215 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   Trusted domain names cache on top of gencache.
+
+   Copyright (C) Rafal Szczesniak	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"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_ALL	/* there's no proper class yet */
+
+#define TDOMKEY_FMT  "TDOM/%s"
+
+
+/**
+ * @file trustdom_cache.c
+ *
+ * Implementation of trusted domain names cache useful when
+ * samba acts as domain member server. In such case, caching
+ * domain names currently trusted gives a performance gain
+ * because there's no need to query PDC each time we need
+ * list of trusted domains
+ **/
+
+ 
+/**
+ * Initialise trustdom name caching system. Call gencache
+ * initialisation routine to perform necessary activities.
+ *
+ * @return true upon successful cache initialisation or
+ *         false if cache init failed
+ **/
+ 
+BOOL trustdom_cache_enable(void)
+{
+	/* Init trustdom cache by calling gencache initialisation */
+	if (!gencache_init()) {
+		DEBUG(2, ("trustdomcache_enable: Couldn't initialise trustdom cache on top of gencache.\n"));
+		return False;
+	}
+
+	return True;
+}
+
+
+/**
+ * Shutdown trustdom name caching system. Calls gencache
+ * shutdown function.
+ *
+ * @return true upon successful cache close or
+ *         false if it failed
+ **/
+ 
+BOOL trustdom_cache_shutdown(void)
+{
+	/* Close trustdom cache by calling gencache shutdown */
+	if (!gencache_shutdown()) {
+		DEBUG(2, ("trustdomcache_shutdown: Couldn't shutdown trustdom cache on top of gencache.\n"));
+		return False;
+	}
+	
+	return True;
+}
+
+
+/**
+ * Form up trustdom name key. It is based only
+ * on domain name now.
+ *
+ * @param name trusted domain name
+ * @return cache key for use in gencache mechanism
+ **/
+
+static char* trustdom_cache_key(const char* name)
+{
+	char* keystr;
+	asprintf(&keystr, TDOMKEY_FMT, strupper_static(name));
+	
+	return keystr;
+}
+
+
+/**
+ * Store trusted domain in gencache as the domain name (key)
+ * and ip address of domain controller (value)
+ *
+ * @param name trusted domain name
+ * @param alt_name alternative trusted domain name (used in ADS domains)
+ * @param sid trusted domain's SID
+ * @param timeout cache entry expiration time
+ * @return true upon successful value storing or
+ *         false if store attempt failed
+ **/
+ 
+BOOL trustdom_cache_store(char* name, char* alt_name, const DOM_SID *sid,
+                          time_t timeout)
+{
+	char *key, *alt_key;
+	fstring sid_string;
+
+	/*
+	 * we use gecache call to avoid annoying debug messages
+	 * about initialised trustdom 
+	 */
+	if (!gencache_init()) return False;
+
+	DEBUG(5, ("trustdom_store: storing SID %s of domain %s\n",
+	          sid_string_static(sid), name));
+
+	key = trustdom_cache_key(name);
+	alt_key = alt_name ? trustdom_cache_key(alt_name) : NULL;
+
+	/* Generate string representation domain SID */
+	sid_to_string(sid_string, sid);
+
+	/*
+	 * try to put the names in the cache
+	 */
+	if (alt_key) {
+		return (gencache_set(alt_key, sid_string, timeout)
+		        && gencache_set(key, sid_string, timeout));
+	}
+		 
+	return gencache_set(key, sid_string, timeout);
+}
+
+
+/**
+ * Fetch trusted domain's dc from the gencache.
+ * This routine can also be used to check whether given
+ * domain is currently trusted one.
+ *
+ * @param name trusted domain name
+ * @param sid trusted domain's SID to be returned
+ * @return true if entry is found or
+ *         false if has expired/doesn't exist
+ **/
+ 
+BOOL trustdom_cache_fetch(const char* name, DOM_SID* sid)
+{
+	char *key, *value;
+	time_t timeout;
+
+	/* init the cache */
+	if (!gencache_init()) return False;
+	
+	/* exit now if null pointers were passed as they're required further */
+	if (!sid) return False;
+
+	/* prepare a key and get the value */
+	key = trustdom_cache_key(name);
+	
+	if (!gencache_get(key, &value, &timeout)) {
+		DEBUG(5, ("no entry for trusted domain %s found.\n", name));
+		return False;
+	} else {
+		DEBUG(5, ("trusted domain %s found (%s)\n", name, value));
+	}
+
+	/* convert ip string representation into in_addr structure */
+	if(! string_to_sid(sid, value)) {
+		sid = NULL;
+		return False;
+	}
+	
+	return True;
+}
+
+
+/**
+ * Delete single trustdom entry. Look at the
+ * gencache_iterate definition.
+ *
+ **/
+
+static void flush_trustdom_name(const char* key, const char *value, time_t timeout, void* dptr)
+{
+	gencache_del(key);
+	DEBUG(5, ("Deleting entry %s\n", key));
+}
+
+
+/**
+ * Flush all the trusted domains entries from the cache.
+ **/
+
+void trustdom_cache_flush(void)
+{
+	if (!gencache_init())
+		return;
+
+	/* 
+	 * iterate through each TDOM cache's entry and flush it
+	 * by flush_trustdom_name function
+	 */
+	gencache_iterate(flush_trustdom_name, NULL, trustdom_cache_key("*"));
+	DEBUG(5, ("Trusted domains cache flushed\n"));
+}
+

source/printing/printing_db.c

@@ -0,0 +1,204 @@
+/* 
+   Unix SMB/Netbios implementation.
+   Version 3.0
+   printing backend routines
+   Copyright (C) Andrew Tridgell 1992-2000
+   Copyright (C) Jeremy Allison 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 "printing.h"
+
+static struct tdb_print_db *print_db_head;
+
+/****************************************************************************
+  Function to find or create the printer specific job tdb given a printername.
+  Limits the number of tdb's open to MAX_PRINT_DBS_OPEN.
+****************************************************************************/
+
+struct tdb_print_db *get_print_db_byname(const char *printername)
+{
+	struct tdb_print_db *p = NULL, *last_entry = NULL;
+	int num_open = 0;
+	pstring printdb_path;
+	BOOL done_become_root = False;
+
+	for (p = print_db_head, last_entry = print_db_head; p; p = p->next) {
+		/* Ensure the list terminates... JRA. */
+		SMB_ASSERT(p->next != print_db_head);
+
+		if (p->tdb && strequal(p->printer_name, printername)) {
+			DLIST_PROMOTE(print_db_head, p);
+			p->ref_count++;
+			return p;
+		}
+		num_open++;
+		last_entry = p;
+	}
+
+	/* Not found. */
+	if (num_open >= MAX_PRINT_DBS_OPEN) {
+		/* Try and recycle the last entry. */
+		DLIST_PROMOTE(print_db_head, last_entry);
+
+		for (p = print_db_head; p; p = p->next) {
+			if (p->ref_count)
+				continue;
+			if (p->tdb) {
+				if (tdb_close(print_db_head->tdb)) {
+					DEBUG(0,("get_print_db: Failed to close tdb for printer %s\n",
+								print_db_head->printer_name ));
+					return NULL;
+				}
+			}
+			p->tdb = NULL;
+			p->ref_count = 0;
+			memset(p->printer_name, '\0', sizeof(p->printer_name));
+			break;
+		}
+		if (p) {
+			DLIST_PROMOTE(print_db_head, p);
+			p = print_db_head;
+		}
+	}
+       
+	if (!p)	{
+		/* Create one. */
+		p = (struct tdb_print_db *)malloc(sizeof(struct tdb_print_db));
+		if (!p) {
+			DEBUG(0,("get_print_db: malloc fail !\n"));
+			return NULL;
+		}
+		ZERO_STRUCTP(p);
+		DLIST_ADD(print_db_head, p);
+	}
+
+	pstrcpy(printdb_path, lock_path("printing/"));
+	pstrcat(printdb_path, printername);
+	pstrcat(printdb_path, ".tdb");
+
+	if (geteuid() != 0) {
+		become_root();
+		done_become_root = True;
+	}
+
+	p->tdb = tdb_open_log(printdb_path, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
+
+	if (done_become_root)
+		unbecome_root();
+
+	if (!p->tdb) {
+		DEBUG(0,("get_print_db: Failed to open printer backend database %s.\n",
+					printdb_path ));
+		DLIST_REMOVE(print_db_head, p);
+		SAFE_FREE(p);
+		return NULL;
+	}
+	fstrcpy(p->printer_name, printername);
+	p->ref_count++;
+	return p;
+}
+
+/***************************************************************************
+ Remove a reference count.
+****************************************************************************/
+
+void release_print_db( struct tdb_print_db *pdb)
+{
+	pdb->ref_count--;
+	SMB_ASSERT(pdb->ref_count >= 0);
+}
+
+/***************************************************************************
+ Close all open print db entries.
+****************************************************************************/
+
+void close_all_print_db(void)
+{
+	struct tdb_print_db *p = NULL, *next_p = NULL;
+
+	for (p = print_db_head; p; p = next_p) {
+		next_p = p->next;
+
+		if (p->tdb)
+			tdb_close(p->tdb);
+		DLIST_REMOVE(print_db_head, p);
+		ZERO_STRUCTP(p);
+		SAFE_FREE(p);
+	}
+}
+
+
+/****************************************************************************
+ Fetch and clean the pid_t record list for all pids interested in notify
+ messages. data needs freeing on exit.
+****************************************************************************/
+
+TDB_DATA get_printer_notify_pid_list(TDB_CONTEXT *tdb, const char *printer_name, BOOL cleanlist)
+{
+	TDB_DATA data;
+	size_t i;
+
+	ZERO_STRUCT(data);
+
+	data = tdb_fetch_by_string( tdb, NOTIFY_PID_LIST_KEY );
+
+	if (!data.dptr) {
+		ZERO_STRUCT(data);
+		return data;
+	}
+
+	if (data.dsize % 8) {
+		DEBUG(0,("get_printer_notify_pid_list: Size of record for printer %s not a multiple of 8 !\n", printer_name ));
+		tdb_delete_by_string(tdb, NOTIFY_PID_LIST_KEY );
+		SAFE_FREE(data.dptr);
+		ZERO_STRUCT(data);
+		return data;
+	}
+
+	if (!cleanlist)
+		return data;
+
+	/*
+	 * Weed out all dead entries.
+	 */
+
+	for( i = 0; i < data.dsize; i += 8) {
+		pid_t pid = (pid_t)IVAL(data.dptr, i);
+
+		if (pid == sys_getpid())
+			continue;
+
+		/* Entry is dead if process doesn't exist or refcount is zero. */
+
+		while ((i < data.dsize) && ((IVAL(data.dptr, i + 4) == 0) || !process_exists(pid))) {
+
+			/* Refcount == zero is a logic error and should never happen. */
+			if (IVAL(data.dptr, i + 4) == 0) {
+				DEBUG(0,("get_printer_notify_pid_list: Refcount == 0 for pid = %u printer %s !\n",
+							(unsigned int)pid, printer_name ));
+			}
+
+			if (data.dsize - i > 8)
+				memmove( &data.dptr[i], &data.dptr[i+8], data.dsize - i - 8);
+			data.dsize -= 8;
+		}
+	}
+
+	return data;
+}
+
+