source3/smbd/server_reload.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Main SMB server routines
   4    Copyright (C) Andrew Tridgell                1992-1998
   5    Copyright (C) Martin Pool                    2002
   6    Copyright (C) Jelmer Vernooij                2002-2003
   7    Copyright (C) Volker Lendecke                1993-2007
   8    Copyright (C) Jeremy Allison                 1993-2007
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "smbd/smbd.h"
  26 #include "smbd/globals.h"
  27 #include "nt_printing.h"
  28 #include "printing/pcap.h"
  29 #include "printing/load.h"
  30 #include "auth.h"
  31 #include "messages.h"
  32 #include "lib/param/loadparm.h"
  33
  34 /*
  35  * The persistent pcap cache is populated by the background print process. Per
  36  * client smbds should only reload their printer share inventories if this
  37  * information has changed. Use reload_last_pcap_time to detect this.
  38  */
  39 static time_t reload_last_pcap_time = 0;
  40
  41 bool snum_is_shared_printer(int snum)
  42 {
  43         return (lp_browseable(snum) && lp_snum_ok(snum) && lp_printable(snum));
  44 }
  45
  46 /**
  47  * @brief Purge stale printer shares and reload from pre-populated pcap cache.
  48  *
  49  * This function should normally only be called as a callback on a successful
  50  * pcap_cache_reload(), or on client enumeration.
  51  */
  52 void delete_and_reload_printers(void)
  53 {
  54         int n_services;
  55         int pnum;
  56         int snum;
  57         const char *pname;
  58         bool ok;
  59         time_t pcap_last_update;
  60         TALLOC_CTX *frame = talloc_stackframe();
  61         const struct loadparm_substitution *lp_sub =
  62                 loadparm_s3_global_substitution();
  63
  64         ok = pcap_cache_loaded(&pcap_last_update);
  65         if (!ok) {
  66                 DEBUG(1, ("pcap cache not loaded\n"));
  67                 talloc_free(frame);
  68                 return;
  69         }
  70
  71         if (reload_last_pcap_time == pcap_last_update) {
  72                 DEBUG(5, ("skipping printer reload, already up to date.\n"));
  73                 talloc_free(frame);
  74                 return;
  75         }
  76         reload_last_pcap_time = pcap_last_update;
  77
  78         /* Get pcap printers updated */
  79         load_printers();
  80
  81         n_services = lp_numservices();
  82         pnum = lp_servicenumber(PRINTERS_NAME);
  83
  84         DEBUG(10, ("reloading printer services from pcap cache\n"));
  85
  86         /*
  87          * Add default config for printers added to smb.conf file and remove
  88          * stale printers
  89          */
  90         for (snum = 0; snum < n_services; snum++) {
  91                 /* avoid removing PRINTERS_NAME */
  92                 if (snum == pnum) {
  93                         continue;
  94                 }
  95
  96                 /* skip no-printer services */
  97                 if (!snum_is_shared_printer(snum)) {
  98                         continue;
  99                 }
 100
 101                 pname = lp_printername(frame, lp_sub, snum);
 102
 103                 /* check printer, but avoid removing non-autoloaded printers */
 104                 if (lp_autoloaded(snum) && !pcap_printername_ok(pname)) {
 105                         lp_killservice(snum);
 106                 }
 107         }
 108
 109         /* Make sure deleted printers are gone */
 110         load_printers();
 111
 112         talloc_free(frame);
 113 }
 114
 115 /****************************************************************************
 116  Reload the services file.
 117 **************************************************************************/
 118
 119 bool reload_services(struct smbd_server_connection *sconn,
 120                      bool (*snumused) (struct smbd_server_connection *, int),
 121                      bool test)
 122 {
 123         const struct loadparm_substitution *lp_sub =
 124                 loadparm_s3_global_substitution();
 125         struct smbXsrv_connection *xconn = NULL;
 126         bool ret;
 127
 128         if (lp_loaded()) {
 129                 char *fname = lp_next_configfile(talloc_tos(), lp_sub);
 130                 if (file_exist(fname) &&
 131                     !strcsequal(fname, get_dyn_CONFIGFILE())) {
 132                         set_dyn_CONFIGFILE(fname);
 133                         test = False;
 134                 }
 135                 TALLOC_FREE(fname);
 136         }
 137
 138         reopen_logs();
 139
 140         if (test && !lp_file_list_changed())
 141                 return(True);
 142
 143         lp_killunused(sconn, snumused);
 144
 145         ret = lp_load_with_shares(get_dyn_CONFIGFILE());
 146
 147         /* perhaps the config filename is now set */
 148         if (!test) {
 149                 reload_services(sconn, snumused, true);
 150         }
 151
 152         reopen_logs();
 153
 154         load_interfaces();
 155
 156         if (sconn != NULL && sconn->client != NULL) {
 157                 xconn = sconn->client->connections;
 158         }
 159         for (;xconn != NULL; xconn = xconn->next) {
 160                 set_socket_options(xconn->transport.sock, "SO_KEEPALIVE");
 161                 set_socket_options(xconn->transport.sock, lp_socket_options());
 162         }
 163
 164         mangle_reset_cache();
 165         reset_stat_cache();
 166         flush_dfree_cache();
 167
 168         return(ret);
 169 }