unbound/smallapp/unbound-control.c

   1 /*
   2  * checkconf/unbound-control.c - remote control utility for unbound.
   3  *
   4  * Copyright (c) 2008, NLnet Labs. All rights reserved.
   5  *
   6  * This software is open source.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * Redistributions of source code must retain the above copyright notice,
  13  * this list of conditions and the following disclaimer.
  14  *
  15  * Redistributions in binary form must reproduce the above copyright notice,
  16  * this list of conditions and the following disclaimer in the documentation
  17  * and/or other materials provided with the distribution.
  18  *
  19  * Neither the name of the NLNET LABS nor the names of its contributors may
  20  * be used to endorse or promote products derived from this software without
  21  * specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  25  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  26  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  27  * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  28  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  29  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  30  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 /**
  37  * \file
  38  *
  39  * The remote control utility contacts the unbound server over ssl and
  40  * sends the command, receives the answer, and displays the result
  41  * from the commandline.
  42  */
  43
  44 #include "config.h"
  45 #ifdef HAVE_GETOPT_H
  46 #include <getopt.h>
  47 #endif
  48 #ifdef HAVE_OPENSSL_SSL_H
  49 #include <openssl/ssl.h>
  50 #endif
  51 #ifdef HAVE_OPENSSL_ERR_H
  52 #include <openssl/err.h>
  53 #endif
  54 #ifdef HAVE_OPENSSL_RAND_H
  55 #include <openssl/rand.h>
  56 #endif
  57 #include "util/log.h"
  58 #include "util/config_file.h"
  59 #include "util/locks.h"
  60 #include "util/net_help.h"
  61
  62 /** Give unbound-control usage, and exit (1). */
  63 static void
  64 usage()
  65 {
  66         printf("Usage:  unbound-control [options] command\n");
  67         printf("        Remote control utility for unbound server.\n");
  68         printf("Options:\n");
  69         printf("  -c file       config file, default is %s\n", CONFIGFILE);
  70         printf("  -s ip[@port]  server address, if omitted config is used.\n");
  71         printf("  -q            quiet (don't print anything if it works ok).\n");
  72         printf("  -h            show this usage help.\n");
  73         printf("Commands:\n");
  74         printf("  start                         start server; runs unbound(8)\n");
  75         printf("  stop                          stops the server\n");
  76         printf("  reload                        reloads the server\n");
  77         printf("                                (this flushes data, stats, requestlist)\n");
  78         printf("  stats                         print statistics\n");
  79         printf("  stats_noreset                 peek at statistics\n");
  80         printf("  status                        display status of server\n");
  81         printf("  verbosity <number>            change logging detail\n");
  82         printf("  log_reopen                    close and open the logfile\n");
  83         printf("  local_zone <name> <type>      add new local zone\n");
  84         printf("  local_zone_remove <name>      remove local zone and its contents\n");
  85         printf("  local_data <RR data...>       add local data, for example\n");
  86         printf("                                local_data www.example.com A 192.0.2.1\n");
  87         printf("  local_data_remove <name>      remove local RR data from name\n");
  88         printf("  dump_cache                    print cache to stdout\n");
  89         printf("  load_cache                    load cache from stdin\n");
  90         printf("  lookup <name>                 print nameservers for name\n");
  91         printf("  flush <name>                  flushes common types for name from cache\n");
  92         printf("                                types:  A, AAAA, MX, PTR, NS,\n");
  93         printf("                                        SOA, CNAME, DNAME, SRV, NAPTR\n");
  94         printf("  flush_type <name> <type>      flush name, type from cache\n");
  95         printf("  flush_zone <name>             flush everything at or under name\n");
  96         printf("                                from rr and dnssec caches\n");
  97         printf("  flush_bogus                   flush all bogus data\n");
  98         printf("  flush_negative                flush all negative data\n");
  99         printf("  flush_stats                   flush statistics, make zero\n");
 100         printf("  flush_requestlist             drop queries that are worked on\n");
 101         printf("  dump_requestlist              show what is worked on\n");
 102         printf("  flush_infra [all | ip]        remove ping, edns for one IP or all\n");
 103         printf("  dump_infra                    show ping and edns entries\n");
 104         printf("  set_option opt: val           set option to value, no reload\n");
 105         printf("  get_option opt                get option value\n");
 106         printf("  list_stubs                    list stub-zones and root hints in use\n");
 107         printf("  list_forwards                 list forward-zones in use\n");
 108         printf("  list_local_zones              list local-zones in use\n");
 109         printf("  list_local_data               list local-data RRs in use\n");
 110         printf("  insecure_add zone             add domain-insecure zone\n");
 111         printf("  insecure_remove zone          remove domain-insecure zone\n");
 112         printf("  forward_add [+i] zone addr..  add forward-zone with servers\n");
 113         printf("  forward_remove [+i] zone      remove forward zone\n");
 114         printf("  stub_add [+ip] zone addr..    add stub-zone with servers\n");
 115         printf("  stub_remove [+i] zone         remove stub zone\n");
 116         printf("                +i              also do dnssec insecure point\n");
 117         printf("                +p              set stub to use priming\n");
 118         printf("  forward [off | addr ...]      without arg show forward setup\n");
 119         printf("                                or off to turn off root forwarding\n");
 120         printf("                                or give list of ip addresses\n");
 121         printf("Version %s\n", PACKAGE_VERSION);
 122         printf("BSD licensed, see LICENSE in source package for details.\n");
 123         printf("Report bugs to %s\n", PACKAGE_BUGREPORT);
 124         exit(1);
 125 }
 126
 127 /** exit with ssl error */
 128 static void ssl_err(const char* s)
 129 {
 130         fprintf(stderr, "error: %s\n", s);
 131         ERR_print_errors_fp(stderr);
 132         exit(1);
 133 }
 134
 135 /** setup SSL context */
 136 static SSL_CTX*
 137 setup_ctx(struct config_file* cfg)
 138 {
 139         char* s_cert, *c_key, *c_cert;
 140         SSL_CTX* ctx;
 141
 142         s_cert = fname_after_chroot(cfg->server_cert_file, cfg, 1);
 143         c_key = fname_after_chroot(cfg->control_key_file, cfg, 1);
 144         c_cert = fname_after_chroot(cfg->control_cert_file, cfg, 1);
 145         if(!s_cert || !c_key || !c_cert)
 146                 fatal_exit("out of memory");
 147         ctx = SSL_CTX_new(SSLv23_client_method());
 148         if(!ctx)
 149                 ssl_err("could not allocate SSL_CTX pointer");
 150         if(!(SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2) & SSL_OP_NO_SSLv2))
 151                 ssl_err("could not set SSL_OP_NO_SSLv2");
 152         if(!(SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv3) & SSL_OP_NO_SSLv3))
 153                 ssl_err("could not set SSL_OP_NO_SSLv3");
 154         if(!SSL_CTX_use_certificate_file(ctx,c_cert,SSL_FILETYPE_PEM) ||
 155                 !SSL_CTX_use_PrivateKey_file(ctx,c_key,SSL_FILETYPE_PEM)
 156                 || !SSL_CTX_check_private_key(ctx))
 157                 ssl_err("Error setting up SSL_CTX client key and cert");
 158         if (SSL_CTX_load_verify_locations(ctx, s_cert, NULL) != 1)
 159                 ssl_err("Error setting up SSL_CTX verify, server cert");
 160         SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
 161
 162         free(s_cert);
 163         free(c_key);
 164         free(c_cert);
 165         return ctx;
 166 }
 167
 168 /** contact the server with TCP connect */
 169 static int
 170 contact_server(const char* svr, struct config_file* cfg, int statuscmd)
 171 {
 172         struct sockaddr_storage addr;
 173         socklen_t addrlen;
 174         int fd;
 175         /* use svr or the first config entry */
 176         if(!svr) {
 177                 if(cfg->control_ifs)
 178                         svr = cfg->control_ifs->str;
 179                 else    svr = "127.0.0.1";
 180                 /* config 0 addr (everything), means ask localhost */
 181                 if(strcmp(svr, "0.0.0.0") == 0)
 182                         svr = "127.0.0.1";
 183                 else if(strcmp(svr, "::0") == 0 ||
 184                         strcmp(svr, "0::0") == 0 ||
 185                         strcmp(svr, "0::") == 0 ||
 186                         strcmp(svr, "::") == 0)
 187                         svr = "::1";
 188         }
 189         if(strchr(svr, '@')) {
 190                 if(!extstrtoaddr(svr, &addr, &addrlen))
 191                         fatal_exit("could not parse IP@port: %s", svr);
 192         } else {
 193                 if(!ipstrtoaddr(svr, cfg->control_port, &addr, &addrlen))
 194                         fatal_exit("could not parse IP: %s", svr);
 195         }
 196         fd = socket(addr_is_ip6(&addr, addrlen)?AF_INET6:AF_INET,
 197                 SOCK_STREAM, 0);
 198         if(fd == -1) {
 199 #ifndef USE_WINSOCK
 200                 fatal_exit("socket: %s", strerror(errno));
 201 #else
 202                 fatal_exit("socket: %s", wsa_strerror(WSAGetLastError()));
 203 #endif
 204         }
 205         if(connect(fd, (struct sockaddr*)&addr, addrlen) < 0) {
 206 #ifndef USE_WINSOCK
 207                 log_err_addr("connect", strerror(errno), &addr, addrlen);
 208                 if(errno == ECONNREFUSED && statuscmd) {
 209                         printf("unbound is stopped\n");
 210                         exit(3);
 211                 }
 212 #else
 213                 log_err_addr("connect", wsa_strerror(WSAGetLastError()), &addr, addrlen);
 214                 if(WSAGetLastError() == WSAECONNREFUSED && statuscmd) {
 215                         printf("unbound is stopped\n");
 216                         exit(3);
 217                 }
 218 #endif
 219                 exit(1);
 220         }
 221         return fd;
 222 }
 223
 224 /** setup SSL on the connection */
 225 static SSL*
 226 setup_ssl(SSL_CTX* ctx, int fd)
 227 {
 228         SSL* ssl;
 229         X509* x;
 230         int r;
 231
 232         ssl = SSL_new(ctx);
 233         if(!ssl)
 234                 ssl_err("could not SSL_new");
 235         SSL_set_connect_state(ssl);
 236         (void)SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
 237         if(!SSL_set_fd(ssl, fd))
 238                 ssl_err("could not SSL_set_fd");
 239         while(1) {
 240                 ERR_clear_error();
 241                 if( (r=SSL_do_handshake(ssl)) == 1)
 242                         break;
 243                 r = SSL_get_error(ssl, r);
 244                 if(r != SSL_ERROR_WANT_READ && r != SSL_ERROR_WANT_WRITE)
 245                         ssl_err("SSL handshake failed");
 246                 /* wants to be called again */
 247         }
 248
 249         /* check authenticity of server */
 250         if(SSL_get_verify_result(ssl) != X509_V_OK)
 251                 ssl_err("SSL verification failed");
 252         x = SSL_get_peer_certificate(ssl);
 253         if(!x)
 254                 ssl_err("Server presented no peer certificate");
 255         X509_free(x);
 256         return ssl;
 257 }
 258
 259 /** send stdin to server */
 260 static void
 261 send_file(SSL* ssl, FILE* in, char* buf, size_t sz)
 262 {
 263         while(fgets(buf, (int)sz, in)) {
 264                 if(SSL_write(ssl, buf, (int)strlen(buf)) <= 0)
 265                         ssl_err("could not SSL_write contents");
 266         }
 267 }
 268
 269 /** send command and display result */
 270 static int
 271 go_cmd(SSL* ssl, int quiet, int argc, char* argv[])
 272 {
 273         char pre[10];
 274         const char* space=" ";
 275         const char* newline="\n";
 276         int was_error = 0, first_line = 1;
 277         int r, i;
 278         char buf[1024];
 279         snprintf(pre, sizeof(pre), "UBCT%d ", UNBOUND_CONTROL_VERSION);
 280         if(SSL_write(ssl, pre, (int)strlen(pre)) <= 0)
 281                 ssl_err("could not SSL_write");
 282         for(i=0; i<argc; i++) {
 283                 if(SSL_write(ssl, space, (int)strlen(space)) <= 0)
 284                         ssl_err("could not SSL_write");
 285                 if(SSL_write(ssl, argv[i], (int)strlen(argv[i])) <= 0)
 286                         ssl_err("could not SSL_write");
 287         }
 288         if(SSL_write(ssl, newline, (int)strlen(newline)) <= 0)
 289                 ssl_err("could not SSL_write");
 290
 291         if(argc == 1 && strcmp(argv[0], "load_cache") == 0) {
 292                 send_file(ssl, stdin, buf, sizeof(buf));
 293         }
 294
 295         while(1) {
 296                 ERR_clear_error();
 297                 if((r = SSL_read(ssl, buf, (int)sizeof(buf)-1)) <= 0) {
 298                         if(SSL_get_error(ssl, r) == SSL_ERROR_ZERO_RETURN) {
 299                                 /* EOF */
 300                                 break;
 301                         }
 302                         ssl_err("could not SSL_read");
 303                 }
 304                 buf[r] = 0;
 305                 if(first_line && strncmp(buf, "error", 5) == 0) {
 306                         printf("%s", buf);
 307                         was_error = 1;
 308                 } else if (!quiet)
 309                         printf("%s", buf);
 310
 311                 first_line = 0;
 312         }
 313         return was_error;
 314 }
 315
 316 /** go ahead and read config, contact server and perform command and display */
 317 static int
 318 go(const char* cfgfile, char* svr, int quiet, int argc, char* argv[])
 319 {
 320         struct config_file* cfg;
 321         int fd, ret;
 322         SSL_CTX* ctx;
 323         SSL* ssl;
 324
 325         /* read config */
 326         if(!(cfg = config_create()))
 327                 fatal_exit("out of memory");
 328         if(!config_read(cfg, cfgfile, NULL))
 329                 fatal_exit("could not read config file");
 330         if(!cfg->remote_control_enable)
 331                 log_warn("control-enable is 'no' in the config file.");
 332         ctx = setup_ctx(cfg);
 333
 334         /* contact server */
 335         fd = contact_server(svr, cfg, argc>0&&strcmp(argv[0],"status")==0);
 336         ssl = setup_ssl(ctx, fd);
 337
 338         /* send command */
 339         ret = go_cmd(ssl, quiet, argc, argv);
 340
 341         SSL_free(ssl);
 342 #ifndef USE_WINSOCK
 343         close(fd);
 344 #else
 345         closesocket(fd);
 346 #endif
 347         SSL_CTX_free(ctx);
 348         config_delete(cfg);
 349         return ret;
 350 }
 351
 352 /** getopt global, in case header files fail to declare it. */
 353 extern int optind;
 354 /** getopt global, in case header files fail to declare it. */
 355 extern char* optarg;
 356
 357 /** Main routine for unbound-control */
 358 int main(int argc, char* argv[])
 359 {
 360         int c, ret;
 361         int quiet = 0;
 362         const char* cfgfile = CONFIGFILE;
 363         char* svr = NULL;
 364 #ifdef USE_WINSOCK
 365         int r;
 366         WSADATA wsa_data;
 367 #endif
 368 #ifdef USE_THREAD_DEBUG
 369         /* stop the file output from unbound-control, overwites the servers */
 370         extern int check_locking_order;
 371         check_locking_order = 0;
 372 #endif /* USE_THREAD_DEBUG */
 373         log_ident_set("unbound-control");
 374         log_init(NULL, 0, NULL);
 375         checklock_start();
 376 #ifdef USE_WINSOCK
 377         if((r = WSAStartup(MAKEWORD(2,2), &wsa_data)) != 0)
 378                 fatal_exit("WSAStartup failed: %s", wsa_strerror(r));
 379         /* use registry config file in preference to compiletime location */
 380         if(!(cfgfile=w_lookup_reg_str("Software\\Unbound", "ConfigFile")))
 381                 cfgfile = CONFIGFILE;
 382 #endif
 383
 384         ERR_load_crypto_strings();
 385         ERR_load_SSL_strings();
 386         OpenSSL_add_all_algorithms();
 387         (void)SSL_library_init();
 388
 389         if(!RAND_status()) {
 390                 /* try to seed it */
 391                 unsigned char buf[256];
 392                 unsigned int seed=(unsigned)time(NULL) ^ (unsigned)getpid();
 393                 unsigned int v = seed;
 394                 size_t i;
 395                 for(i=0; i<256/sizeof(v); i++) {
 396                         memmove(buf+i*sizeof(v), &v, sizeof(v));
 397                         v = v*seed + (unsigned int)i;
 398                 }
 399                 RAND_seed(buf, 256);
 400                 log_warn("no entropy, seeding openssl PRNG with time\n");
 401         }
 402
 403         /* parse the options */
 404         while( (c=getopt(argc, argv, "c:s:qh")) != -1) {
 405                 switch(c) {
 406                 case 'c':
 407                         cfgfile = optarg;
 408                         break;
 409                 case 's':
 410                         svr = optarg;
 411                         break;
 412                 case 'q':
 413                         quiet = 1;
 414                         break;
 415                 case '?':
 416                 case 'h':
 417                 default:
 418                         usage();
 419                 }
 420         }
 421         argc -= optind;
 422         argv += optind;
 423         if(argc == 0)
 424                 usage();
 425         if(argc >= 1 && strcmp(argv[0], "start")==0) {
 426                 if(execlp("unbound", "unbound", "-c", cfgfile,
 427                         (char*)NULL) < 0) {
 428                         fatal_exit("could not exec unbound: %s",
 429                                 strerror(errno));
 430                 }
 431         }
 432
 433         ret = go(cfgfile, svr, quiet, argc, argv);
 434
 435 #ifdef USE_WINSOCK
 436         WSACleanup();
 437 #endif
 438         checklock_stop();
 439         return ret;
 440 }