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-rw-r--r--bin/named/control.c307
1 files changed, 307 insertions, 0 deletions
diff --git a/bin/named/control.c b/bin/named/control.c
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+++ b/bin/named/control.c
@@ -0,0 +1,307 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#include <stdbool.h>
+
+#include <isc/app.h>
+#include <isc/event.h>
+#include <isc/lex.h>
+#include <isc/mem.h>
+#include <isc/result.h>
+#include <isc/string.h>
+#include <isc/timer.h>
+#include <isc/util.h>
+
+#include <isccc/alist.h>
+#include <isccc/cc.h>
+
+#include <named/control.h>
+#include <named/globals.h>
+#include <named/log.h>
+#include <named/os.h>
+#include <named/server.h>
+#ifdef HAVE_LIBSCF
+#include <named/smf_globals.h>
+#endif /* ifdef HAVE_LIBSCF */
+
+static isc_result_t
+getcommand(isc_lex_t *lex, char **cmdp) {
+ isc_result_t result;
+ isc_token_t token;
+
+ REQUIRE(cmdp != NULL && *cmdp == NULL);
+
+ result = isc_lex_gettoken(lex, ISC_LEXOPT_EOF, &token);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ isc_lex_ungettoken(lex, &token);
+
+ if (token.type != isc_tokentype_string) {
+ return (ISC_R_FAILURE);
+ }
+
+ *cmdp = token.value.as_textregion.base;
+
+ return (ISC_R_SUCCESS);
+}
+
+static bool
+command_compare(const char *str, const char *command) {
+ return (strcasecmp(str, command) == 0);
+}
+
+/*%
+ * This function is called to process the incoming command
+ * when a control channel message is received.
+ */
+isc_result_t
+named_control_docommand(isccc_sexpr_t *message, bool readonly,
+ isc_buffer_t **text) {
+ isccc_sexpr_t *data;
+ char *cmdline = NULL;
+ char *command = NULL;
+ isc_result_t result;
+ int log_level;
+ isc_buffer_t src;
+ isc_lex_t *lex = NULL;
+#ifdef HAVE_LIBSCF
+ named_smf_want_disable = 0;
+#endif /* ifdef HAVE_LIBSCF */
+
+ data = isccc_alist_lookup(message, "_data");
+ if (!isccc_alist_alistp(data)) {
+ /*
+ * No data section.
+ */
+ return (ISC_R_FAILURE);
+ }
+
+ result = isccc_cc_lookupstring(data, "type", &cmdline);
+ if (result != ISC_R_SUCCESS) {
+ /*
+ * We have no idea what this is.
+ */
+ return (result);
+ }
+
+ result = isc_lex_create(named_g_mctx, strlen(cmdline), &lex);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ isc_buffer_init(&src, cmdline, strlen(cmdline));
+ isc_buffer_add(&src, strlen(cmdline));
+ result = isc_lex_openbuffer(lex, &src);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+
+ result = getcommand(lex, &command);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+
+ /*
+ * Compare the 'command' parameter against all known control commands.
+ */
+ if ((command_compare(command, NAMED_COMMAND_NULL) &&
+ strlen(cmdline) == 4) ||
+ command_compare(command, NAMED_COMMAND_STATUS))
+ {
+ log_level = ISC_LOG_DEBUG(1);
+ } else {
+ log_level = ISC_LOG_INFO;
+ }
+
+ /*
+ * If this listener should have read-only access, reject
+ * restricted commands here. rndc nta is handled specially
+ * below.
+ */
+ if (readonly && !command_compare(command, NAMED_COMMAND_NTA) &&
+ !command_compare(command, NAMED_COMMAND_NULL) &&
+ !command_compare(command, NAMED_COMMAND_STATUS) &&
+ !command_compare(command, NAMED_COMMAND_SHOWZONE) &&
+ !command_compare(command, NAMED_COMMAND_TESTGEN) &&
+ !command_compare(command, NAMED_COMMAND_ZONESTATUS))
+ {
+ isc_log_write(named_g_lctx, NAMED_LOGCATEGORY_GENERAL,
+ NAMED_LOGMODULE_CONTROL, log_level,
+ "rejecting restricted control channel "
+ "command '%s'",
+ cmdline);
+ result = ISC_R_FAILURE;
+ goto cleanup;
+ }
+
+ isc_log_write(named_g_lctx, NAMED_LOGCATEGORY_GENERAL,
+ NAMED_LOGMODULE_CONTROL, log_level,
+ "received control channel command '%s'", cmdline);
+
+ /*
+ * After the lengthy "halt" and "stop", the commands are
+ * handled in alphabetical order of the NAMED_COMMAND_ macros.
+ */
+ if (command_compare(command, NAMED_COMMAND_HALT)) {
+#ifdef HAVE_LIBSCF
+ /*
+ * If we are managed by smf(5), AND in chroot, then
+ * we cannot connect to the smf repository, so just
+ * return with an appropriate message back to rndc.
+ */
+ if (named_smf_got_instance == 1 && named_smf_chroot == 1) {
+ result = named_smf_add_message(text);
+ goto cleanup;
+ }
+ /*
+ * If we are managed by smf(5) but not in chroot,
+ * try to disable ourselves the smf way.
+ */
+ if (named_smf_got_instance == 1 && named_smf_chroot == 0) {
+ named_smf_want_disable = 1;
+ }
+ /*
+ * If named_smf_got_instance = 0, named_smf_chroot
+ * is not relevant and we fall through to
+ * isc_app_shutdown below.
+ */
+#endif /* ifdef HAVE_LIBSCF */
+ /* Do not flush master files */
+ named_server_flushonshutdown(named_g_server, false);
+ named_os_shutdownmsg(cmdline, *text);
+ result = ISC_R_SHUTTINGDOWN;
+ } else if (command_compare(command, NAMED_COMMAND_STOP)) {
+ /*
+ * "stop" is the same as "halt" except it does
+ * flush master files.
+ */
+#ifdef HAVE_LIBSCF
+ if (named_smf_got_instance == 1 && named_smf_chroot == 1) {
+ result = named_smf_add_message(text);
+ goto cleanup;
+ }
+ if (named_smf_got_instance == 1 && named_smf_chroot == 0) {
+ named_smf_want_disable = 1;
+ }
+#endif /* ifdef HAVE_LIBSCF */
+ named_server_flushonshutdown(named_g_server, true);
+ named_os_shutdownmsg(cmdline, *text);
+ result = ISC_R_SHUTTINGDOWN;
+ } else if (command_compare(command, NAMED_COMMAND_ADDZONE) ||
+ command_compare(command, NAMED_COMMAND_MODZONE))
+ {
+ result = named_server_changezone(named_g_server, cmdline, text);
+ } else if (command_compare(command, NAMED_COMMAND_DELZONE)) {
+ result = named_server_delzone(named_g_server, lex, text);
+ } else if (command_compare(command, NAMED_COMMAND_DNSSEC)) {
+ result = named_server_dnssec(named_g_server, lex, text);
+ } else if (command_compare(command, NAMED_COMMAND_DNSTAP) ||
+ command_compare(command, NAMED_COMMAND_DNSTAPREOPEN))
+ {
+ result = named_server_dnstap(named_g_server, lex, text);
+ } else if (command_compare(command, NAMED_COMMAND_DUMPDB)) {
+ named_server_dumpdb(named_g_server, lex, text);
+ result = ISC_R_SUCCESS;
+ } else if (command_compare(command, NAMED_COMMAND_DUMPSTATS)) {
+ result = named_server_dumpstats(named_g_server);
+ } else if (command_compare(command, NAMED_COMMAND_FLUSH)) {
+ result = named_server_flushcache(named_g_server, lex);
+ } else if (command_compare(command, NAMED_COMMAND_FLUSHNAME)) {
+ result = named_server_flushnode(named_g_server, lex, false);
+ } else if (command_compare(command, NAMED_COMMAND_FLUSHTREE)) {
+ result = named_server_flushnode(named_g_server, lex, true);
+ } else if (command_compare(command, NAMED_COMMAND_FREEZE)) {
+ result = named_server_freeze(named_g_server, true, lex, text);
+ } else if (command_compare(command, NAMED_COMMAND_LOADKEYS) ||
+ command_compare(command, NAMED_COMMAND_SIGN))
+ {
+ result = named_server_rekey(named_g_server, lex, text);
+ } else if (command_compare(command, NAMED_COMMAND_MKEYS)) {
+ result = named_server_mkeys(named_g_server, lex, text);
+ } else if (command_compare(command, NAMED_COMMAND_NOTIFY)) {
+ result = named_server_notifycommand(named_g_server, lex, text);
+ } else if (command_compare(command, NAMED_COMMAND_NOTRACE)) {
+ named_g_debuglevel = 0;
+ isc_log_setdebuglevel(named_g_lctx, named_g_debuglevel);
+ result = ISC_R_SUCCESS;
+ } else if (command_compare(command, NAMED_COMMAND_NTA)) {
+ result = named_server_nta(named_g_server, lex, readonly, text);
+ } else if (command_compare(command, NAMED_COMMAND_NULL)) {
+ result = ISC_R_SUCCESS;
+ } else if (command_compare(command, NAMED_COMMAND_QUERYLOG)) {
+ result = named_server_togglequerylog(named_g_server, lex);
+ } else if (command_compare(command, NAMED_COMMAND_RECONFIG)) {
+ result = named_server_reconfigcommand(named_g_server);
+ } else if (command_compare(command, NAMED_COMMAND_RECURSING)) {
+ result = named_server_dumprecursing(named_g_server);
+ } else if (command_compare(command, NAMED_COMMAND_REFRESH)) {
+ result = named_server_refreshcommand(named_g_server, lex, text);
+ } else if (command_compare(command, NAMED_COMMAND_RELOAD)) {
+ result = named_server_reloadcommand(named_g_server, lex, text);
+ } else if (command_compare(command, NAMED_COMMAND_RETRANSFER)) {
+ result = named_server_retransfercommand(named_g_server, lex,
+ text);
+ } else if (command_compare(command, NAMED_COMMAND_SCAN)) {
+ named_server_scan_interfaces(named_g_server);
+ result = ISC_R_SUCCESS;
+ } else if (command_compare(command, NAMED_COMMAND_SECROOTS)) {
+ result = named_server_dumpsecroots(named_g_server, lex, text);
+ } else if (command_compare(command, NAMED_COMMAND_SERVESTALE)) {
+ result = named_server_servestale(named_g_server, lex, text);
+ } else if (command_compare(command, NAMED_COMMAND_SHOWZONE)) {
+ result = named_server_showzone(named_g_server, lex, text);
+ } else if (command_compare(command, NAMED_COMMAND_SIGNING)) {
+ result = named_server_signing(named_g_server, lex, text);
+ } else if (command_compare(command, NAMED_COMMAND_STATUS)) {
+ result = named_server_status(named_g_server, text);
+ } else if (command_compare(command, NAMED_COMMAND_SYNC)) {
+ result = named_server_sync(named_g_server, lex, text);
+ } else if (command_compare(command, NAMED_COMMAND_TCPTIMEOUTS)) {
+ result = named_server_tcptimeouts(lex, text);
+ } else if (command_compare(command, NAMED_COMMAND_TESTGEN)) {
+ result = named_server_testgen(lex, text);
+ } else if (command_compare(command, NAMED_COMMAND_THAW) ||
+ command_compare(command, NAMED_COMMAND_UNFREEZE))
+ {
+ result = named_server_freeze(named_g_server, false, lex, text);
+ } else if (command_compare(command, NAMED_COMMAND_TIMERPOKE)) {
+ isc_timermgr_poke(named_g_timermgr);
+ result = ISC_R_SUCCESS;
+ } else if (command_compare(command, NAMED_COMMAND_TRACE)) {
+ result = named_server_setdebuglevel(named_g_server, lex);
+ } else if (command_compare(command, NAMED_COMMAND_TSIGDELETE)) {
+ result = named_server_tsigdelete(named_g_server, lex, text);
+ } else if (command_compare(command, NAMED_COMMAND_TSIGLIST)) {
+ result = named_server_tsiglist(named_g_server, text);
+ } else if (command_compare(command, NAMED_COMMAND_VALIDATION)) {
+ result = named_server_validation(named_g_server, lex, text);
+ } else if (command_compare(command, NAMED_COMMAND_ZONESTATUS)) {
+ result = named_server_zonestatus(named_g_server, lex, text);
+ } else {
+ isc_log_write(named_g_lctx, NAMED_LOGCATEGORY_GENERAL,
+ NAMED_LOGMODULE_CONTROL, ISC_LOG_WARNING,
+ "unknown control channel command '%s'", command);
+ result = DNS_R_UNKNOWNCOMMAND;
+ }
+
+cleanup:
+ if (lex != NULL) {
+ isc_lex_destroy(&lex);
+ }
+
+ return (result);
+}