473 lines
14 KiB
C
473 lines
14 KiB
C
/*
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* checkconf/unbound-control.c - remote control utility for unbound.
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*
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* Copyright (c) 2008, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* The remote control utility contacts the unbound server over ssl and
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* sends the command, receives the answer, and displays the result
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* from the commandline.
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*/
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#include "config.h"
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#ifdef HAVE_GETOPT_H
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#include <getopt.h>
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#endif
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#ifdef HAVE_OPENSSL_SSL_H
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#include <openssl/ssl.h>
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#endif
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#ifdef HAVE_OPENSSL_ERR_H
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#include <openssl/err.h>
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#endif
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#ifdef HAVE_OPENSSL_RAND_H
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#include <openssl/rand.h>
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#endif
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#include "util/log.h"
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#include "util/config_file.h"
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#include "util/locks.h"
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#include "util/net_help.h"
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#ifdef HAVE_SYS_UN_H
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#include <sys/un.h>
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#endif
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/** Give unbound-control usage, and exit (1). */
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static void
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usage()
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{
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printf("Usage: unbound-control [options] command\n");
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printf(" Remote control utility for unbound server.\n");
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printf("Options:\n");
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printf(" -c file config file, default is %s\n", CONFIGFILE);
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printf(" -s ip[@port] server address, if omitted config is used.\n");
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printf(" -q quiet (don't print anything if it works ok).\n");
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printf(" -h show this usage help.\n");
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printf("Commands:\n");
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printf(" start start server; runs unbound(8)\n");
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printf(" stop stops the server\n");
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printf(" reload reloads the server\n");
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printf(" (this flushes data, stats, requestlist)\n");
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printf(" stats print statistics\n");
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printf(" stats_noreset peek at statistics\n");
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printf(" status display status of server\n");
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printf(" verbosity <number> change logging detail\n");
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printf(" log_reopen close and open the logfile\n");
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printf(" local_zone <name> <type> add new local zone\n");
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printf(" local_zone_remove <name> remove local zone and its contents\n");
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printf(" local_data <RR data...> add local data, for example\n");
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printf(" local_data www.example.com A 192.0.2.1\n");
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printf(" local_data_remove <name> remove local RR data from name\n");
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printf(" dump_cache print cache to stdout\n");
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printf(" load_cache load cache from stdin\n");
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printf(" lookup <name> print nameservers for name\n");
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printf(" flush <name> flushes common types for name from cache\n");
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printf(" types: A, AAAA, MX, PTR, NS,\n");
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printf(" SOA, CNAME, DNAME, SRV, NAPTR\n");
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printf(" flush_type <name> <type> flush name, type from cache\n");
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printf(" flush_zone <name> flush everything at or under name\n");
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printf(" from rr and dnssec caches\n");
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printf(" flush_bogus flush all bogus data\n");
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printf(" flush_negative flush all negative data\n");
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printf(" flush_stats flush statistics, make zero\n");
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printf(" flush_requestlist drop queries that are worked on\n");
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printf(" dump_requestlist show what is worked on\n");
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printf(" flush_infra [all | ip] remove ping, edns for one IP or all\n");
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printf(" dump_infra show ping and edns entries\n");
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printf(" set_option opt: val set option to value, no reload\n");
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printf(" get_option opt get option value\n");
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printf(" list_stubs list stub-zones and root hints in use\n");
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printf(" list_forwards list forward-zones in use\n");
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printf(" list_insecure list domain-insecure zones\n");
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printf(" list_local_zones list local-zones in use\n");
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printf(" list_local_data list local-data RRs in use\n");
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printf(" insecure_add zone add domain-insecure zone\n");
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printf(" insecure_remove zone remove domain-insecure zone\n");
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printf(" forward_add [+i] zone addr.. add forward-zone with servers\n");
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printf(" forward_remove [+i] zone remove forward zone\n");
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printf(" stub_add [+ip] zone addr.. add stub-zone with servers\n");
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printf(" stub_remove [+i] zone remove stub zone\n");
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printf(" +i also do dnssec insecure point\n");
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printf(" +p set stub to use priming\n");
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printf(" forward [off | addr ...] without arg show forward setup\n");
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printf(" or off to turn off root forwarding\n");
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printf(" or give list of ip addresses\n");
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printf(" ratelimit_list [+a] list ratelimited domains\n");
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printf(" +a list all, also not ratelimited\n");
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printf("Version %s\n", PACKAGE_VERSION);
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printf("BSD licensed, see LICENSE in source package for details.\n");
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printf("Report bugs to %s\n", PACKAGE_BUGREPORT);
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exit(1);
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}
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/** exit with ssl error */
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static void ssl_err(const char* s)
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{
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fprintf(stderr, "error: %s\n", s);
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ERR_print_errors_fp(stderr);
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exit(1);
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}
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/** setup SSL context */
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static SSL_CTX*
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setup_ctx(struct config_file* cfg)
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{
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char* s_cert=NULL, *c_key=NULL, *c_cert=NULL;
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SSL_CTX* ctx;
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if(cfg->remote_control_use_cert) {
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s_cert = fname_after_chroot(cfg->server_cert_file, cfg, 1);
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c_key = fname_after_chroot(cfg->control_key_file, cfg, 1);
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c_cert = fname_after_chroot(cfg->control_cert_file, cfg, 1);
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if(!s_cert || !c_key || !c_cert)
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fatal_exit("out of memory");
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}
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ctx = SSL_CTX_new(SSLv23_client_method());
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if(!ctx)
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ssl_err("could not allocate SSL_CTX pointer");
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if(!(SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2) & SSL_OP_NO_SSLv2))
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ssl_err("could not set SSL_OP_NO_SSLv2");
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if(cfg->remote_control_use_cert) {
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if(!(SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv3) & SSL_OP_NO_SSLv3))
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ssl_err("could not set SSL_OP_NO_SSLv3");
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if(!SSL_CTX_use_certificate_chain_file(ctx,c_cert) ||
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!SSL_CTX_use_PrivateKey_file(ctx,c_key,SSL_FILETYPE_PEM)
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|| !SSL_CTX_check_private_key(ctx))
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ssl_err("Error setting up SSL_CTX client key and cert");
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if (SSL_CTX_load_verify_locations(ctx, s_cert, NULL) != 1)
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ssl_err("Error setting up SSL_CTX verify, server cert");
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SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
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free(s_cert);
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free(c_key);
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free(c_cert);
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} else {
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/* Use ciphers that don't require authentication */
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if(!SSL_CTX_set_cipher_list(ctx, "aNULL"))
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ssl_err("Error setting NULL cipher!");
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}
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return ctx;
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}
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/** contact the server with TCP connect */
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static int
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contact_server(const char* svr, struct config_file* cfg, int statuscmd)
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{
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struct sockaddr_storage addr;
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socklen_t addrlen;
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int addrfamily = 0;
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int fd;
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/* use svr or the first config entry */
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if(!svr) {
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if(cfg->control_ifs)
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svr = cfg->control_ifs->str;
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else svr = "127.0.0.1";
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/* config 0 addr (everything), means ask localhost */
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if(strcmp(svr, "0.0.0.0") == 0)
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svr = "127.0.0.1";
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else if(strcmp(svr, "::0") == 0 ||
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strcmp(svr, "0::0") == 0 ||
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strcmp(svr, "0::") == 0 ||
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strcmp(svr, "::") == 0)
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svr = "::1";
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}
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if(strchr(svr, '@')) {
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if(!extstrtoaddr(svr, &addr, &addrlen))
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fatal_exit("could not parse IP@port: %s", svr);
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#ifdef HAVE_SYS_UN_H
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} else if(svr[0] == '/') {
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struct sockaddr_un* usock = (struct sockaddr_un *) &addr;
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usock->sun_family = AF_LOCAL;
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#ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
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usock->sun_len = (socklen_t)sizeof(usock);
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#endif
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(void)strlcpy(usock->sun_path, svr, sizeof(usock->sun_path));
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addrlen = (socklen_t)sizeof(struct sockaddr_un);
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addrfamily = AF_LOCAL;
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#endif
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} else {
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if(!ipstrtoaddr(svr, cfg->control_port, &addr, &addrlen))
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fatal_exit("could not parse IP: %s", svr);
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}
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if(addrfamily == 0)
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addrfamily = addr_is_ip6(&addr, addrlen)?AF_INET6:AF_INET;
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fd = socket(addrfamily, SOCK_STREAM, 0);
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if(fd == -1) {
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#ifndef USE_WINSOCK
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fatal_exit("socket: %s", strerror(errno));
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#else
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fatal_exit("socket: %s", wsa_strerror(WSAGetLastError()));
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#endif
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}
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if(connect(fd, (struct sockaddr*)&addr, addrlen) < 0) {
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#ifndef USE_WINSOCK
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log_err_addr("connect", strerror(errno), &addr, addrlen);
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if(errno == ECONNREFUSED && statuscmd) {
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printf("unbound is stopped\n");
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exit(3);
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}
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#else
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log_err_addr("connect", wsa_strerror(WSAGetLastError()), &addr, addrlen);
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if(WSAGetLastError() == WSAECONNREFUSED && statuscmd) {
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printf("unbound is stopped\n");
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exit(3);
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}
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#endif
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exit(1);
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}
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return fd;
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}
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/** setup SSL on the connection */
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static SSL*
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setup_ssl(SSL_CTX* ctx, int fd, struct config_file* cfg)
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{
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SSL* ssl;
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X509* x;
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int r;
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ssl = SSL_new(ctx);
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if(!ssl)
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ssl_err("could not SSL_new");
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SSL_set_connect_state(ssl);
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(void)SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
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if(!SSL_set_fd(ssl, fd))
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ssl_err("could not SSL_set_fd");
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while(1) {
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ERR_clear_error();
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if( (r=SSL_do_handshake(ssl)) == 1)
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break;
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r = SSL_get_error(ssl, r);
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if(r != SSL_ERROR_WANT_READ && r != SSL_ERROR_WANT_WRITE)
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ssl_err("SSL handshake failed");
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/* wants to be called again */
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}
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/* check authenticity of server */
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if(SSL_get_verify_result(ssl) != X509_V_OK)
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ssl_err("SSL verification failed");
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if(cfg->remote_control_use_cert) {
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x = SSL_get_peer_certificate(ssl);
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if(!x)
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ssl_err("Server presented no peer certificate");
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X509_free(x);
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}
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return ssl;
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}
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/** send stdin to server */
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static void
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send_file(SSL* ssl, FILE* in, char* buf, size_t sz)
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{
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while(fgets(buf, (int)sz, in)) {
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if(SSL_write(ssl, buf, (int)strlen(buf)) <= 0)
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ssl_err("could not SSL_write contents");
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}
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}
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/** send command and display result */
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static int
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go_cmd(SSL* ssl, int quiet, int argc, char* argv[])
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{
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char pre[10];
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const char* space=" ";
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const char* newline="\n";
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int was_error = 0, first_line = 1;
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int r, i;
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char buf[1024];
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snprintf(pre, sizeof(pre), "UBCT%d ", UNBOUND_CONTROL_VERSION);
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if(SSL_write(ssl, pre, (int)strlen(pre)) <= 0)
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ssl_err("could not SSL_write");
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for(i=0; i<argc; i++) {
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if(SSL_write(ssl, space, (int)strlen(space)) <= 0)
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ssl_err("could not SSL_write");
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if(SSL_write(ssl, argv[i], (int)strlen(argv[i])) <= 0)
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ssl_err("could not SSL_write");
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}
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if(SSL_write(ssl, newline, (int)strlen(newline)) <= 0)
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ssl_err("could not SSL_write");
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if(argc == 1 && strcmp(argv[0], "load_cache") == 0) {
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send_file(ssl, stdin, buf, sizeof(buf));
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}
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while(1) {
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ERR_clear_error();
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if((r = SSL_read(ssl, buf, (int)sizeof(buf)-1)) <= 0) {
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if(SSL_get_error(ssl, r) == SSL_ERROR_ZERO_RETURN) {
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/* EOF */
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break;
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}
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ssl_err("could not SSL_read");
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}
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buf[r] = 0;
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if(first_line && strncmp(buf, "error", 5) == 0) {
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printf("%s", buf);
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was_error = 1;
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} else if (!quiet)
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printf("%s", buf);
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first_line = 0;
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}
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return was_error;
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}
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/** go ahead and read config, contact server and perform command and display */
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static int
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go(const char* cfgfile, char* svr, int quiet, int argc, char* argv[])
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{
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struct config_file* cfg;
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int fd, ret;
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SSL_CTX* ctx;
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SSL* ssl;
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/* read config */
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if(!(cfg = config_create()))
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fatal_exit("out of memory");
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if(!config_read(cfg, cfgfile, NULL))
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fatal_exit("could not read config file");
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if(!cfg->remote_control_enable)
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log_warn("control-enable is 'no' in the config file.");
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ctx = setup_ctx(cfg);
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/* contact server */
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fd = contact_server(svr, cfg, argc>0&&strcmp(argv[0],"status")==0);
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ssl = setup_ssl(ctx, fd, cfg);
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/* send command */
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ret = go_cmd(ssl, quiet, argc, argv);
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SSL_free(ssl);
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#ifndef USE_WINSOCK
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close(fd);
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#else
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closesocket(fd);
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#endif
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SSL_CTX_free(ctx);
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config_delete(cfg);
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return ret;
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}
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/** getopt global, in case header files fail to declare it. */
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extern int optind;
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/** getopt global, in case header files fail to declare it. */
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extern char* optarg;
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/** Main routine for unbound-control */
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int main(int argc, char* argv[])
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{
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int c, ret;
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int quiet = 0;
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const char* cfgfile = CONFIGFILE;
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char* svr = NULL;
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#ifdef USE_WINSOCK
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int r;
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WSADATA wsa_data;
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#endif
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#ifdef USE_THREAD_DEBUG
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/* stop the file output from unbound-control, overwites the servers */
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extern int check_locking_order;
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check_locking_order = 0;
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#endif /* USE_THREAD_DEBUG */
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log_ident_set("unbound-control");
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log_init(NULL, 0, NULL);
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checklock_start();
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#ifdef USE_WINSOCK
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if((r = WSAStartup(MAKEWORD(2,2), &wsa_data)) != 0)
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fatal_exit("WSAStartup failed: %s", wsa_strerror(r));
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/* use registry config file in preference to compiletime location */
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if(!(cfgfile=w_lookup_reg_str("Software\\Unbound", "ConfigFile")))
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cfgfile = CONFIGFILE;
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#endif
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ERR_load_crypto_strings();
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ERR_load_SSL_strings();
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OpenSSL_add_all_algorithms();
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(void)SSL_library_init();
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if(!RAND_status()) {
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/* try to seed it */
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unsigned char buf[256];
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unsigned int seed=(unsigned)time(NULL) ^ (unsigned)getpid();
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unsigned int v = seed;
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size_t i;
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for(i=0; i<256/sizeof(v); i++) {
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memmove(buf+i*sizeof(v), &v, sizeof(v));
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v = v*seed + (unsigned int)i;
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}
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RAND_seed(buf, 256);
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log_warn("no entropy, seeding openssl PRNG with time\n");
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}
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/* parse the options */
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while( (c=getopt(argc, argv, "c:s:qh")) != -1) {
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switch(c) {
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case 'c':
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cfgfile = optarg;
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break;
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case 's':
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svr = optarg;
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break;
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case 'q':
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quiet = 1;
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break;
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case '?':
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case 'h':
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if(argc == 0)
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usage();
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if(argc >= 1 && strcmp(argv[0], "start")==0) {
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if(execlp("unbound", "unbound", "-c", cfgfile,
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(char*)NULL) < 0) {
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fatal_exit("could not exec unbound: %s",
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strerror(errno));
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}
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}
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ret = go(cfgfile, svr, quiet, argc, argv);
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#ifdef USE_WINSOCK
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WSACleanup();
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#endif
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checklock_stop();
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return ret;
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}
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