2 Unix SMB/Netbios implementation.
4 printing backend routines
5 Copyright (C) Andrew Tridgell 1992-2000
6 Copyright (C) Jeremy Allison 2002
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include "system/passwd.h" /* uid_wrapper */
24 #include "system/filesys.h"
28 static struct tdb_print_db *print_db_head;
30 /****************************************************************************
31 Function to find or create the printer specific job tdb given a printername.
32 Limits the number of tdb's open to MAX_PRINT_DBS_OPEN.
33 ****************************************************************************/
35 struct tdb_print_db *get_print_db_byname(const char *printername)
37 struct tdb_print_db *p = NULL, *last_entry = NULL;
39 char *printdb_path = NULL;
40 bool done_become_root = False;
42 SMB_ASSERT(printername != NULL);
44 for (p = print_db_head, last_entry = print_db_head; p; p = p->next) {
45 /* Ensure the list terminates... JRA. */
46 SMB_ASSERT(p->next != print_db_head);
48 if (p->tdb && strequal(p->printer_name, printername)) {
49 DLIST_PROMOTE(print_db_head, p);
58 if (num_open >= MAX_PRINT_DBS_OPEN) {
59 /* Try and recycle the last entry. */
60 if (print_db_head && last_entry) {
61 DLIST_PROMOTE(print_db_head, last_entry);
64 for (p = print_db_head; p; p = p->next) {
68 if (tdb_close(print_db_head->tdb)) {
69 DEBUG(0,("get_print_db: Failed to close tdb for printer %s\n",
70 print_db_head->printer_name ));
76 memset(p->printer_name, '\0', sizeof(p->printer_name));
79 if (p && print_db_head) {
80 DLIST_PROMOTE(print_db_head, p);
87 p = SMB_MALLOC_P(struct tdb_print_db);
89 DEBUG(0,("get_print_db: malloc fail !\n"));
93 DLIST_ADD(print_db_head, p);
96 if (asprintf(&printdb_path, "%s%s.tdb",
97 cache_path("printing/"),
99 DLIST_REMOVE(print_db_head, p);
104 if (geteuid() != sec_initial_uid()) {
106 done_become_root = True;
109 p->tdb = tdb_open_log(printdb_path, 5000, TDB_DEFAULT, O_RDWR|O_CREAT,
112 if (done_become_root)
116 DEBUG(0,("get_print_db: Failed to open printer backend database %s.\n",
118 DLIST_REMOVE(print_db_head, p);
119 SAFE_FREE(printdb_path);
123 SAFE_FREE(printdb_path);
124 fstrcpy(p->printer_name, printername);
129 /***************************************************************************
130 Remove a reference count.
131 ****************************************************************************/
133 void release_print_db( struct tdb_print_db *pdb)
136 SMB_ASSERT(pdb->ref_count >= 0);
139 /***************************************************************************
140 Close all open print db entries.
141 ****************************************************************************/
143 void close_all_print_db(void)
145 struct tdb_print_db *p = NULL, *next_p = NULL;
147 for (p = print_db_head; p; p = next_p) {
152 DLIST_REMOVE(print_db_head, p);
159 /****************************************************************************
160 Fetch and clean the pid_t record list for all pids interested in notify
161 messages. data needs freeing on exit.
162 ****************************************************************************/
164 TDB_DATA get_printer_notify_pid_list(struct tdb_context *tdb, const char *printer_name, bool cleanlist)
171 data = tdb_fetch_bystring( tdb, NOTIFY_PID_LIST_KEY );
178 if (data.dsize % 8) {
179 DEBUG(0,("get_printer_notify_pid_list: Size of record for printer %s not a multiple of 8 !\n", printer_name ));
180 tdb_delete_bystring(tdb, NOTIFY_PID_LIST_KEY );
181 SAFE_FREE(data.dptr);
190 * Weed out all dead entries.
193 for( i = 0; i < data.dsize; i += 8) {
194 pid_t pid = (pid_t)IVAL(data.dptr, i);
199 /* Entry is dead if process doesn't exist or refcount is zero. */
201 while ((i < data.dsize) && ((IVAL(data.dptr, i + 4) == 0) || !process_exists_by_pid(pid))) {
203 /* Refcount == zero is a logic error and should never happen. */
204 if (IVAL(data.dptr, i + 4) == 0) {
205 DEBUG(0,("get_printer_notify_pid_list: Refcount == 0 for pid = %u printer %s !\n",
206 (unsigned int)pid, printer_name ));
209 if (data.dsize - i > 8)
210 memmove( &data.dptr[i], &data.dptr[i+8], data.dsize - i - 8);