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  * @param[in] ev        The event context.
  53  *
  54  * @param[in] msg_ctx   The messaging context.
  55  */
  56 void delete_and_reload_printers(struct tevent_context *ev,
  57                                 struct messaging_context *msg_ctx)
  58 {
  59         int n_services;
  60         int pnum;
  61         int snum;
  62         const char *pname;
  63         bool ok;
  64         time_t pcap_last_update;
  65         TALLOC_CTX *frame = talloc_stackframe();
  66
  67         ok = pcap_cache_loaded(&pcap_last_update);
  68         if (!ok) {
  69                 DEBUG(1, ("pcap cache not loaded\n"));
  70                 talloc_free(frame);
  71                 return;
  72         }
  73
  74         if (reload_last_pcap_time == pcap_last_update) {
  75                 DEBUG(5, ("skipping printer reload, already up to date.\n"));
  76                 talloc_free(frame);
  77                 return;
  78         }
  79         reload_last_pcap_time = pcap_last_update;
  80
  81         /* Get pcap printers updated */
  82         load_printers(ev, msg_ctx);
  83
  84         n_services = lp_numservices();
  85         pnum = lp_servicenumber(PRINTERS_NAME);
  86
  87         DEBUG(10, ("reloading printer services from pcap cache\n"));
  88
  89         /*
  90          * Add default config for printers added to smb.conf file and remove
  91          * stale printers
  92          */
  93         for (snum = 0; snum < n_services; snum++) {
  94                 /* avoid removing PRINTERS_NAME */
  95                 if (snum == pnum) {
  96                         continue;
  97                 }
  98
  99                 /* skip no-printer services */
 100                 if (!snum_is_shared_printer(snum)) {
 101                         continue;
 102                 }
 103
 104                 pname = lp_printername(frame, snum);
 105
 106                 /* check printer, but avoid removing non-autoloaded printers */
 107                 if (lp_autoloaded(snum) && !pcap_printername_ok(pname)) {
 108                         lp_killservice(snum);
 109                 }
 110         }
 111
 112         /* Make sure deleted printers are gone */
 113         load_printers(ev, msg_ctx);
 114
 115         talloc_free(frame);
 116 }
 117
 118 /****************************************************************************
 119  Reload the services file.
 120 **************************************************************************/
 121
 122 bool reload_services(struct smbd_server_connection *sconn,
 123                      bool (*snumused) (struct smbd_server_connection *, int),
 124                      bool test)
 125 {
 126         struct smbXsrv_connection *xconn = NULL;
 127         bool ret;
 128
 129         if (lp_loaded()) {
 130                 char *fname = lp_next_configfile(talloc_tos());
 131                 if (file_exist(fname) &&
 132                     !strcsequal(fname, get_dyn_CONFIGFILE())) {
 133                         set_dyn_CONFIGFILE(fname);
 134                         test = False;
 135                 }
 136                 TALLOC_FREE(fname);
 137         }
 138
 139         reopen_logs();
 140
 141         if (test && !lp_file_list_changed())
 142                 return(True);
 143
 144         lp_killunused(sconn, snumused);
 145
 146         ret = lp_load(get_dyn_CONFIGFILE(),
 147                       false, /* global only */
 148                       false, /* save defaults */
 149                       true,  /* add_ipc */
 150                       true); /* initialize globals */
 151
 152         /* perhaps the config filename is now set */
 153         if (!test) {
 154                 reload_services(sconn, snumused, true);
 155         }
 156
 157         reopen_logs();
 158
 159         load_interfaces();
 160
 161         if (sconn != NULL && sconn->client != NULL) {
 162                 xconn = sconn->client->connections;
 163         }
 164         for (;xconn != NULL; xconn = xconn->next) {
 165                 set_socket_options(xconn->transport.sock, "SO_KEEPALIVE");
 166                 set_socket_options(xconn->transport.sock, lp_socket_options());
 167         }
 168
 169         mangle_reset_cache();
 170         reset_stat_cache();
 171
 172         /* this forces service parameters to be flushed */
 173         set_current_service(NULL,0,True);
 174
 175         return(ret);
 176 }