contrib/bind9/bin/named/control.c

   1 /*
   2  * Copyright (C) 2004-2007  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 2001-2003  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and/or 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 1.20.10.10 2007/09/13 23:46:26 tbox Exp $ */
  19
  20 /*! \file */
  21
  22 #include <config.h>
  23
  24
  25 #include <isc/app.h>
  26 #include <isc/event.h>
  27 #include <isc/mem.h>
  28 #include <isc/string.h>
  29 #include <isc/timer.h>
  30 #include <isc/util.h>
  31
  32 #include <dns/result.h>
  33
  34 #include <isccc/alist.h>
  35 #include <isccc/cc.h>
  36 #include <isccc/result.h>
  37
  38 #include <named/control.h>
  39 #include <named/log.h>
  40 #include <named/os.h>
  41 #include <named/server.h>
  42 #ifdef HAVE_LIBSCF
  43 #include <named/ns_smf_globals.h>
  44 #endif
  45
  46 static isc_boolean_t
  47 command_compare(const char *text, const char *command) {
  48         unsigned int commandlen = strlen(command);
  49         if (strncasecmp(text, command, commandlen) == 0 &&
  50             (text[commandlen] == '\0' ||
  51              text[commandlen] == ' ' ||
  52              text[commandlen] == '\t'))
  53                 return (ISC_TRUE);
  54         return (ISC_FALSE);
  55 }
  56
  57 /*%
  58  * This function is called to process the incoming command
  59  * when a control channel message is received.
  60  */
  61 isc_result_t
  62 ns_control_docommand(isccc_sexpr_t *message, isc_buffer_t *text) {
  63         isccc_sexpr_t *data;
  64         char *command;
  65         isc_result_t result;
  66 #ifdef HAVE_LIBSCF
  67         ns_smf_want_disable = 0;
  68 #endif
  69
  70         data = isccc_alist_lookup(message, "_data");
  71         if (data == NULL) {
  72                 /*
  73                  * No data section.
  74                  */
  75                 return (ISC_R_FAILURE);
  76         }
  77
  78         result = isccc_cc_lookupstring(data, "type", &command);
  79         if (result != ISC_R_SUCCESS) {
  80                 /*
  81                  * We have no idea what this is.
  82                  */
  83                 return (result);
  84         }
  85
  86         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  87                       NS_LOGMODULE_CONTROL, ISC_LOG_DEBUG(1),
  88                       "received control channel command '%s'",
  89                       command);
  90
  91         /*
  92          * Compare the 'command' parameter against all known control commands.
  93          */
  94         if (command_compare(command, NS_COMMAND_RELOAD)) {
  95                 result = ns_server_reloadcommand(ns_g_server, command, text);
  96         } else if (command_compare(command, NS_COMMAND_RECONFIG)) {
  97                 result = ns_server_reconfigcommand(ns_g_server, command);
  98         } else if (command_compare(command, NS_COMMAND_REFRESH)) {
  99                 result = ns_server_refreshcommand(ns_g_server, command, text);
 100         } else if (command_compare(command, NS_COMMAND_RETRANSFER)) {
 101                 result = ns_server_retransfercommand(ns_g_server, command);
 102         } else if (command_compare(command, NS_COMMAND_HALT)) {
 103 #ifdef HAVE_LIBSCF
 104                 /*
 105                  * If we are managed by smf(5), AND in chroot, then
 106                  * we cannot connect to the smf repository, so just
 107                  * return with an appropriate message back to rndc.
 108                  */
 109                 if (ns_smf_got_instance == 1 && ns_smf_chroot == 1) {
 110                         result = ns_smf_add_message(text);
 111                         return (result);
 112                 }
 113                 /*
 114                  * If we are managed by smf(5) but not in chroot,
 115                  * try to disable ourselves the smf way.
 116                  */
 117                 if (ns_smf_got_instance == 1 && ns_smf_chroot == 0)
 118                         ns_smf_want_disable = 1;
 119                 /*
 120                  * If ns_smf_got_instance = 0, ns_smf_chroot
 121                  * is not relevant and we fall through to
 122                  * isc_app_shutdown below.
 123                  */
 124 #endif
 125                 ns_server_flushonshutdown(ns_g_server, ISC_FALSE);
 126                 ns_os_shutdownmsg(command, text);
 127                 isc_app_shutdown();
 128                 result = ISC_R_SUCCESS;
 129         } else if (command_compare(command, NS_COMMAND_STOP)) {
 130 #ifdef HAVE_LIBSCF
 131                 if (ns_smf_got_instance == 1 && ns_smf_chroot == 1) {
 132                         result = ns_smf_add_message(text);
 133                         return (result);
 134                 }
 135                 if (ns_smf_got_instance == 1 && ns_smf_chroot == 0)
 136                         ns_smf_want_disable = 1;
 137 #endif
 138                 ns_server_flushonshutdown(ns_g_server, ISC_TRUE);
 139                 ns_os_shutdownmsg(command, text);
 140                 isc_app_shutdown();
 141                 result = ISC_R_SUCCESS;
 142         } else if (command_compare(command, NS_COMMAND_DUMPSTATS)) {
 143                 result = ns_server_dumpstats(ns_g_server);
 144         } else if (command_compare(command, NS_COMMAND_QUERYLOG)) {
 145                 result = ns_server_togglequerylog(ns_g_server);
 146         } else if (command_compare(command, NS_COMMAND_DUMPDB)) {
 147                 ns_server_dumpdb(ns_g_server, command);
 148                 result = ISC_R_SUCCESS;
 149         } else if (command_compare(command, NS_COMMAND_TRACE)) {
 150                 result = ns_server_setdebuglevel(ns_g_server, command);
 151         } else if (command_compare(command, NS_COMMAND_NOTRACE)) {
 152                 ns_g_debuglevel = 0;
 153                 isc_log_setdebuglevel(ns_g_lctx, ns_g_debuglevel);
 154                 result = ISC_R_SUCCESS;
 155         } else if (command_compare(command, NS_COMMAND_FLUSH)) {
 156                 result = ns_server_flushcache(ns_g_server, command);
 157         } else if (command_compare(command, NS_COMMAND_FLUSHNAME)) {
 158                 result = ns_server_flushname(ns_g_server, command);
 159         } else if (command_compare(command, NS_COMMAND_STATUS)) {
 160                 result = ns_server_status(ns_g_server, text);
 161         } else if (command_compare(command, NS_COMMAND_FREEZE)) {
 162                 result = ns_server_freeze(ns_g_server, ISC_TRUE, command);
 163         } else if (command_compare(command, NS_COMMAND_UNFREEZE) ||
 164                    command_compare(command, NS_COMMAND_THAW)) {
 165                 result = ns_server_freeze(ns_g_server, ISC_FALSE, command);
 166         } else if (command_compare(command, NS_COMMAND_RECURSING)) {
 167                 result = ns_server_dumprecursing(ns_g_server);
 168         } else if (command_compare(command, NS_COMMAND_TIMERPOKE)) {
 169                 result = ISC_R_SUCCESS;
 170                 isc_timermgr_poke(ns_g_timermgr);
 171         } else if (command_compare(command, NS_COMMAND_NULL)) {
 172                 result = ISC_R_SUCCESS;
 173         } else if (command_compare(command, NS_COMMAND_NOTIFY)) {
 174                 result = ns_server_notifycommand(ns_g_server, command, text);
 175         } else if (command_compare(command, NS_COMMAND_VALIDATION)) {
 176                 result = ns_server_validation(ns_g_server, command);
 177         } else {
 178                 isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 179                               NS_LOGMODULE_CONTROL, ISC_LOG_WARNING,
 180                               "unknown control channel command '%s'",
 181                               command);
 182                 result = DNS_R_UNKNOWNCOMMAND;
 183         }
 184
 185         return (result);
 186 }