contrib/bind-9.3/bin/named/control.c

   1 /*
   2  * Copyright (C) 2004, 2005  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 2001-2003  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  10  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  11  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  13  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  14  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  15  * PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /* $Id: control.c,v 1.7.2.2.2.14 2005/04/29 01:04:47 marka Exp $ */
  19
  20 #include <config.h>
  21
  22 #include <string.h>
  23
  24 #include <isc/app.h>
  25 #include <isc/event.h>
  26 #include <isc/mem.h>
  27 #include <isc/timer.h>
  28 #include <isc/util.h>
  29
  30 #include <dns/result.h>
  31
  32 #include <isccc/alist.h>
  33 #include <isccc/cc.h>
  34 #include <isccc/result.h>
  35
  36 #include <named/control.h>
  37 #include <named/log.h>
  38 #include <named/os.h>
  39 #include <named/server.h>
  40 #ifdef HAVE_LIBSCF
  41 #include <named/ns_smf_globals.h>
  42 #endif
  43
  44 static isc_boolean_t
  45 command_compare(const char *text, const char *command) {
  46         unsigned int commandlen = strlen(command);
  47         if (strncasecmp(text, command, commandlen) == 0 &&
  48             (text[commandlen] == '\0' ||
  49              text[commandlen] == ' ' ||
  50              text[commandlen] == '\t'))
  51                 return (ISC_TRUE);
  52         return (ISC_FALSE);
  53 }
  54
  55 /*
  56  * This function is called to process the incoming command
  57  * when a control channel message is received.
  58  */
  59 isc_result_t
  60 ns_control_docommand(isccc_sexpr_t *message, isc_buffer_t *text) {
  61         isccc_sexpr_t *data;
  62         char *command;
  63         isc_result_t result;
  64 #ifdef HAVE_LIBSCF
  65         ns_smf_want_disable = 0;
  66 #endif
  67
  68         data = isccc_alist_lookup(message, "_data");
  69         if (data == NULL) {
  70                 /*
  71                  * No data section.
  72                  */
  73                 return (ISC_R_FAILURE);
  74         }
  75
  76         result = isccc_cc_lookupstring(data, "type", &command);
  77         if (result != ISC_R_SUCCESS) {
  78                 /*
  79                  * We have no idea what this is.
  80                  */
  81                 return (result);
  82         }
  83
  84         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  85                       NS_LOGMODULE_CONTROL, ISC_LOG_DEBUG(1),
  86                       "received control channel command '%s'",
  87                       command);
  88
  89         /*
  90          * Compare the 'command' parameter against all known control commands.
  91          */
  92         if (command_compare(command, NS_COMMAND_RELOAD)) {
  93                 result = ns_server_reloadcommand(ns_g_server, command, text);
  94         } else if (command_compare(command, NS_COMMAND_RECONFIG)) {
  95                 result = ns_server_reconfigcommand(ns_g_server, command);
  96         } else if (command_compare(command, NS_COMMAND_REFRESH)) {
  97                 result = ns_server_refreshcommand(ns_g_server, command, text);
  98         } else if (command_compare(command, NS_COMMAND_RETRANSFER)) {
  99                 result = ns_server_retransfercommand(ns_g_server, command);
 100         } else if (command_compare(command, NS_COMMAND_HALT)) {
 101 #ifdef HAVE_LIBSCF
 102                 /*
 103                  * If we are managed by smf(5), AND in chroot, then
 104                  * we cannot connect to the smf repository, so just
 105                  * return with an appropriate message back to rndc.
 106                  */
 107                 if (ns_smf_got_instance == 1 && ns_smf_chroot == 1) {
 108                         result = ns_smf_add_message(text);
 109                         return (result);
 110                 }
 111                 /*
 112                  * If we are managed by smf(5) but not in chroot,
 113                  * try to disable ourselves the smf way.
 114                  */
 115                 if (ns_smf_got_instance == 1 && ns_smf_chroot == 0)
 116                         ns_smf_want_disable = 1;
 117                 /*
 118                  * If ns_smf_got_instance = 0, ns_smf_chroot
 119                  * is not relevant and we fall through to
 120                  * isc_app_shutdown below.
 121                  */
 122 #endif
 123                 ns_server_flushonshutdown(ns_g_server, ISC_FALSE);
 124                 ns_os_shutdownmsg(command, text);
 125                 isc_app_shutdown();
 126                 result = ISC_R_SUCCESS;
 127         } else if (command_compare(command, NS_COMMAND_STOP)) {
 128 #ifdef HAVE_LIBSCF
 129                 if (ns_smf_got_instance == 1 && ns_smf_chroot == 1) {
 130                         result = ns_smf_add_message(text);
 131                         return (result);
 132                 }
 133                 if (ns_smf_got_instance == 1 && ns_smf_chroot == 0)
 134                         ns_smf_want_disable = 1;
 135 #endif
 136                 ns_server_flushonshutdown(ns_g_server, ISC_TRUE);
 137                 ns_os_shutdownmsg(command, text);
 138                 isc_app_shutdown();
 139                 result = ISC_R_SUCCESS;
 140         } else if (command_compare(command, NS_COMMAND_DUMPSTATS)) {
 141                 result = ns_server_dumpstats(ns_g_server);
 142         } else if (command_compare(command, NS_COMMAND_QUERYLOG)) {
 143                 result = ns_server_togglequerylog(ns_g_server);
 144         } else if (command_compare(command, NS_COMMAND_DUMPDB)) {
 145                 ns_server_dumpdb(ns_g_server, command);
 146                 result = ISC_R_SUCCESS;
 147         } else if (command_compare(command, NS_COMMAND_TRACE)) {
 148                 result = ns_server_setdebuglevel(ns_g_server, command);
 149         } else if (command_compare(command, NS_COMMAND_NOTRACE)) {
 150                 ns_g_debuglevel = 0;
 151                 isc_log_setdebuglevel(ns_g_lctx, ns_g_debuglevel);
 152                 result = ISC_R_SUCCESS;
 153         } else if (command_compare(command, NS_COMMAND_FLUSH)) {
 154                 result = ns_server_flushcache(ns_g_server, command);
 155         } else if (command_compare(command, NS_COMMAND_FLUSHNAME)) {
 156                 result = ns_server_flushname(ns_g_server, command);
 157         } else if (command_compare(command, NS_COMMAND_STATUS)) {
 158                 result = ns_server_status(ns_g_server, text);
 159         } else if (command_compare(command, NS_COMMAND_FREEZE)) {
 160                 result = ns_server_freeze(ns_g_server, ISC_TRUE, command);
 161         } else if (command_compare(command, NS_COMMAND_UNFREEZE) ||
 162                    command_compare(command, NS_COMMAND_THAW)) {
 163                 result = ns_server_freeze(ns_g_server, ISC_FALSE, command);
 164         } else if (command_compare(command, NS_COMMAND_RECURSING)) {
 165                 result = ns_server_dumprecursing(ns_g_server);
 166         } else if (command_compare(command, NS_COMMAND_NULL)) {
 167                 result = ISC_R_SUCCESS;
 168         } else {
 169                 isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 170                               NS_LOGMODULE_CONTROL, ISC_LOG_WARNING,
 171                               "unknown control channel command '%s'",
 172                               command);
 173                 result = DNS_R_UNKNOWNCOMMAND;
 174         }
 175
 176         return (result);
 177 }