1/* 2 * nsd-control.c - remote control utility for nsd. 3 * 4 * Copyright (c) 2011, 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 nsd 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#include <stdio.h> 46#include <stdlib.h> 47 48struct region; 49struct domain_table; 50struct zone; 51struct domain; 52int zonec_parse_string(struct region* ATTR_UNUSED(region), 53 struct domain_table* ATTR_UNUSED(domains), 54 struct zone* ATTR_UNUSED(zone), char* ATTR_UNUSED(str), 55 struct domain** ATTR_UNUSED(parsed), int* ATTR_UNUSED(num_rrs)) 56{ 57 return 0; 58} 59 60#include <sys/types.h> 61#include <unistd.h> 62#include <string.h> 63#include <errno.h> 64#ifdef HAVE_SSL 65#ifdef HAVE_OPENSSL_SSL_H 66#include <openssl/ssl.h> 67#endif 68#ifdef HAVE_OPENSSL_ERR_H 69#include <openssl/err.h> 70#endif 71#ifdef HAVE_OPENSSL_RAND_H 72#include <openssl/rand.h> 73#endif 74#endif /* HAVE_SSL */ 75#ifdef HAVE_SYS_UN_H 76#include <sys/un.h> 77#endif 78#include <fcntl.h> 79#ifndef AF_LOCAL 80#define AF_LOCAL AF_UNIX 81#endif 82#include "util.h" 83#include "tsig.h" 84#include "options.h" 85#include "zonec.h" 86 87static void usage(void) ATTR_NORETURN; 88#ifdef HAVE_SSL 89static void ssl_err(const char* s) ATTR_NORETURN; 90static void ssl_path_err(const char* s, const char *path) ATTR_NORETURN; 91#else 92/* define SSL to use as a boolean to turn it off in function calls. */ 93#define SSL int 94#endif 95 96/** timeout to wait for connection over stream, in msec */ 97#define NSD_CONTROL_CONNECT_TIMEOUT 5000 98 99/** Give nsd-control usage, and exit (1). */ 100static void 101usage() 102{ 103 printf("Usage: nsd-control [options] command\n"); 104 printf(" Remote control utility for nsd server.\n"); 105 printf("Version %s. Report bugs to <%s>.\n", 106 PACKAGE_VERSION, PACKAGE_BUGREPORT); 107 printf("Options:\n"); 108 printf(" -c file config file, default is %s\n", CONFIGFILE); 109 printf(" -s ip[@port] server address, if omitted config is used.\n"); 110 printf(" -h show this usage help.\n"); 111 printf("Commands:\n"); 112 printf(" start start server; runs nsd(8)\n"); 113 printf(" stop stops the server\n"); 114 printf(" reload [<zone>] reload modified zonefiles from disk\n"); 115 printf(" reconfig reload the config file\n"); 116 printf(" repattern the same as reconfig\n"); 117 printf(" log_reopen reopen logfile (for log rotate)\n"); 118 printf(" status display status of server\n"); 119 printf(" stats print statistics\n"); 120 printf(" stats_noreset peek at statistics\n"); 121 printf(" addzone <name> <pattern> add a new zone\n"); 122 printf(" delzone <name> remove a zone\n"); 123 printf(" changezone <name> <pattern> change zone to use pattern\n"); 124 printf(" addzones add zone list on stdin {name space pattern newline}\n"); 125 printf(" delzones remove zone list on stdin {name newline}\n"); 126 printf(" write [<zone>] write changed zonefiles to disk\n"); 127 printf(" notify [<zone>] send NOTIFY messages to secondary servers\n"); 128 printf(" transfer [<zone>] try to update secondary zones to newer serial\n"); 129 printf(" force_transfer [<zone>] update secondary zones with AXFR, no serial check\n"); 130 printf(" zonestatus [<zone>] print state, serial, activity\n"); 131 printf(" serverpid get pid of server process\n"); 132 printf(" verbosity <number> change logging detail\n"); 133 printf(" print_tsig [<key_name>] print tsig with <name> the secret and algo\n"); 134 printf(" update_tsig <name> <secret> change existing tsig with <name> to a new <secret>\n"); 135 printf(" add_tsig <name> <secret> [algo] add new key with the given parameters\n"); 136 printf(" assoc_tsig <zone> <key_name> associate <zone> with given tsig <key_name> name\n"); 137 printf(" del_tsig <key_name> delete tsig <key_name> from configuration\n"); 138 printf(" add_cookie_secret <secret> add (or replace) a new cookie secret <secret>\n"); 139 printf(" drop_cookie_secret drop a staging cookie secret\n"); 140 printf(" activate_cookie_secret make a staging cookie secret active\n"); 141 printf(" print_cookie_secrets show all cookie secrets with their status\n"); 142 exit(1); 143} 144 145#ifdef HAVE_SSL 146/** exit with ssl error */ 147static void ssl_err(const char* s) 148{ 149 fprintf(stderr, "error: %s\n", s); 150 ERR_print_errors_fp(stderr); 151 exit(1); 152} 153 154/** exit with ssl error related to a file path */ 155static void ssl_path_err(const char* s, const char *path) 156{ 157 unsigned long err; 158 err = ERR_peek_error(); 159 if (ERR_GET_LIB(err) == ERR_LIB_SYS) { 160 fprintf(stderr, "error: %s\n%s: %s\n", 161 s, path, ERR_reason_error_string(err)); 162 exit(1); 163 } else { 164 ssl_err(s); 165 } 166} 167 168/** setup SSL context */ 169static SSL_CTX* 170setup_ctx(struct nsd_options* cfg) 171{ 172 char* s_cert, *c_key, *c_cert; 173 SSL_CTX* ctx; 174 175 if(!options_remote_is_address(cfg)) 176 return NULL; 177 s_cert = cfg->server_cert_file; 178 c_key = cfg->control_key_file; 179 c_cert = cfg->control_cert_file; 180 181 /* filenames may be relative to zonesdir */ 182 if (cfg->zonesdir && cfg->zonesdir[0] && 183 (s_cert[0] != '/' || c_key[0] != '/' || c_cert[0] != '/')) { 184 if(chdir(cfg->zonesdir)) 185 error("could not chdir to zonesdir: %s %s", 186 cfg->zonesdir, strerror(errno)); 187 } 188 189 ctx = SSL_CTX_new(SSLv23_client_method()); 190 if(!ctx) 191 ssl_err("could not allocate SSL_CTX pointer"); 192#if SSL_OP_NO_SSLv2 != 0 193 if((SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2) & SSL_OP_NO_SSLv2) 194 != SSL_OP_NO_SSLv2) 195 ssl_err("could not set SSL_OP_NO_SSLv2"); 196#endif 197 if((SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv3) & SSL_OP_NO_SSLv3) 198 != SSL_OP_NO_SSLv3) 199 ssl_err("could not set SSL_OP_NO_SSLv3"); 200#if defined(SSL_OP_NO_RENEGOTIATION) 201 /* disable client renegotiation */ 202 if((SSL_CTX_set_options(ctx, SSL_OP_NO_RENEGOTIATION) & 203 SSL_OP_NO_RENEGOTIATION) != SSL_OP_NO_RENEGOTIATION) 204 ssl_err("could not set SSL_OP_NO_RENEGOTIATION"); 205#endif 206 if(!SSL_CTX_use_certificate_file(ctx,c_cert,SSL_FILETYPE_PEM)) 207 ssl_path_err("Error setting up SSL_CTX client cert", c_cert); 208 if(!SSL_CTX_use_PrivateKey_file(ctx,c_key,SSL_FILETYPE_PEM)) 209 ssl_path_err("Error setting up SSL_CTX client key", c_key); 210 if(!SSL_CTX_check_private_key(ctx)) 211 ssl_err("Error setting up SSL_CTX client key"); 212 if (SSL_CTX_load_verify_locations(ctx, s_cert, NULL) != 1) 213 ssl_path_err("Error setting up SSL_CTX verify, server cert", 214 s_cert); 215 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL); 216 217 return ctx; 218} 219#endif /* HAVE_SSL */ 220 221/** check connect error */ 222static void 223checkconnecterr(int err, const char* svr, int port, int statuscmd) 224{ 225 if(!port) fprintf(stderr, "error: connect (%s): %s\n", svr, 226 strerror(err)); 227 else fprintf(stderr, "error: connect (%s@%d): %s\n", svr, port, 228 strerror(err)); 229 if(err == ECONNREFUSED && statuscmd) { 230 printf("nsd is stopped\n"); 231 exit(3); 232 } 233 exit(1); 234} 235 236/** contact the server with TCP connect */ 237static int 238contact_server(const char* svr, struct nsd_options* cfg, int statuscmd) 239{ 240#ifdef INET6 241 struct sockaddr_storage addr; 242#else 243 struct sockaddr_in addr; 244#endif 245 socklen_t addrlen; 246 int fd; 247 int port = cfg->control_port; 248 int addrfamily = 0; 249 /* use svr or a config entry */ 250 if(!svr) { 251 if(cfg->control_interface) { 252 svr = cfg->control_interface->address; 253 } else if(cfg->do_ip4) { 254 svr = "127.0.0.1"; 255 } else { 256 svr = "::1"; 257 } 258 /* config 0 addr (everything), means ask localhost */ 259 if(strcmp(svr, "0.0.0.0") == 0) 260 svr = "127.0.0.1"; 261 else if(strcmp(svr, "::0") == 0 || 262 strcmp(svr, "0::0") == 0 || 263 strcmp(svr, "0::") == 0 || 264 strcmp(svr, "::") == 0) 265 svr = "::1"; 266 } 267 if(strchr(svr, '@')) { 268 char* ps = strchr(svr, '@'); 269 *ps++ = 0; 270 port = atoi(ps); 271 if(!port) { 272 fprintf(stderr, "could not parse port %s\n", ps); 273 exit(1); 274 } 275 } 276 if(svr[0] == '/') { 277#ifdef HAVE_SYS_UN_H 278 struct sockaddr_un* usock = (struct sockaddr_un *) &addr; 279 usock->sun_family = AF_LOCAL; 280#ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN 281 usock->sun_len = (unsigned)sizeof(usock); 282#endif 283 (void)strlcpy(usock->sun_path, svr, sizeof(usock->sun_path)); 284 addrlen = (socklen_t)sizeof(struct sockaddr_un); 285 addrfamily = AF_LOCAL; 286 port = 0; 287#endif 288#ifdef INET6 289 } else if(strchr(svr, ':')) { 290 struct sockaddr_in6 sa; 291 addrlen = (socklen_t)sizeof(struct sockaddr_in6); 292 memset(&sa, 0, addrlen); 293 sa.sin6_family = AF_INET6; 294 sa.sin6_port = (in_port_t)htons((uint16_t)port); 295 if(inet_pton((int)sa.sin6_family, svr, &sa.sin6_addr) <= 0) { 296 fprintf(stderr, "could not parse IP: %s\n", svr); 297 exit(1); 298 } 299 memcpy(&addr, &sa, addrlen); 300 addrfamily = AF_INET6; 301#endif 302 } else { /* ip4 */ 303 struct sockaddr_in sa; 304 addrlen = (socklen_t)sizeof(struct sockaddr_in); 305 memset(&sa, 0, addrlen); 306 sa.sin_family = AF_INET; 307 sa.sin_port = (in_port_t)htons((uint16_t)port); 308 if(inet_pton((int)sa.sin_family, svr, &sa.sin_addr) <= 0) { 309 fprintf(stderr, "could not parse IP: %s\n", svr); 310 exit(1); 311 } 312 memcpy(&addr, &sa, addrlen); 313 addrfamily = AF_INET; 314 } 315 316 fd = socket(addrfamily, SOCK_STREAM, 0); 317 if(fd == -1) { 318 fprintf(stderr, "socket: %s\n", strerror(errno)); 319 exit(1); 320 } 321 if(fcntl(fd, F_SETFL, O_NONBLOCK) == -1) { 322 fprintf(stderr, "error: set nonblocking: fcntl: %s", 323 strerror(errno)); 324 } 325 if(connect(fd, (struct sockaddr*)&addr, addrlen) < 0) { 326 if(errno != EINPROGRESS) { 327 checkconnecterr(errno, svr, port, statuscmd); 328 } 329 } 330 while(1) { 331 fd_set rset, wset, eset; 332 struct timeval tv; 333 FD_ZERO(&rset); 334 FD_SET(fd, &rset); 335 FD_ZERO(&wset); 336 FD_SET(fd, &wset); 337 FD_ZERO(&eset); 338 FD_SET(fd, &eset); 339 tv.tv_sec = NSD_CONTROL_CONNECT_TIMEOUT/1000; 340 tv.tv_usec= (NSD_CONTROL_CONNECT_TIMEOUT%1000)*1000; 341 if(select(fd+1, &rset, &wset, &eset, &tv) == -1) { 342 fprintf(stderr, "select: %s\n", strerror(errno)); 343 exit(1); 344 } 345 if(!FD_ISSET(fd, &rset) && !FD_ISSET(fd, &wset) && 346 !FD_ISSET(fd, &eset)) { 347 fprintf(stderr, "timeout: could not connect to server\n"); 348 exit(1); 349 } else { 350 /* check nonblocking connect error */ 351 int error = 0; 352 socklen_t len = (socklen_t)sizeof(error); 353 if(getsockopt(fd, SOL_SOCKET, SO_ERROR, (void*)&error, 354 &len) < 0) { 355 error = errno; /* on solaris errno is error */ 356 } 357 if(error != 0) { 358 if(error == EINPROGRESS || error == EWOULDBLOCK) 359 continue; /* try again later */ 360 checkconnecterr(error, svr, port, statuscmd); 361 } 362 } 363 break; 364 } 365 if(fcntl(fd, F_SETFL, 0) == -1) { 366 fprintf(stderr, "error: set blocking: fcntl: %s", 367 strerror(errno)); 368 } 369 return fd; 370} 371 372#ifdef HAVE_SSL 373/** setup SSL on the connection */ 374static SSL* 375setup_ssl(SSL_CTX* ctx, int fd) 376{ 377 SSL* ssl; 378 X509* x; 379 int r; 380 381 if(!ctx) return NULL; 382 ssl = SSL_new(ctx); 383 if(!ssl) 384 ssl_err("could not SSL_new"); 385 SSL_set_connect_state(ssl); 386 (void)SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY); 387 if(!SSL_set_fd(ssl, fd)) 388 ssl_err("could not SSL_set_fd"); 389 while(1) { 390 ERR_clear_error(); 391 if( (r=SSL_do_handshake(ssl)) == 1) 392 break; 393 r = SSL_get_error(ssl, r); 394 if(r != SSL_ERROR_WANT_READ && r != SSL_ERROR_WANT_WRITE) 395 ssl_err("SSL handshake failed"); 396 /* wants to be called again */ 397 } 398 399 /* check authenticity of server */ 400 if(SSL_get_verify_result(ssl) != X509_V_OK) 401 ssl_err("SSL verification failed"); 402 x = SSL_get_peer_certificate(ssl); 403 if(!x) 404 ssl_err("Server presented no peer certificate"); 405 X509_free(x); 406 return ssl; 407} 408#endif /* HAVE_SSL */ 409 410/** read from ssl or fd, fatalexit on error, 0 EOF, 1 success */ 411static int 412remote_read(SSL* ssl, int fd, char* buf, size_t len) 413{ 414 if(ssl) { 415#ifdef HAVE_SSL 416 int r; 417 ERR_clear_error(); 418 if((r = SSL_read(ssl, buf, (int)len-1)) <= 0) { 419 if(SSL_get_error(ssl, r) == SSL_ERROR_ZERO_RETURN) { 420 /* EOF */ 421 return 0; 422 } 423 ssl_err("could not SSL_read"); 424 } 425 buf[r] = 0; 426#endif /* HAVE_SSL */ 427 } else { 428 ssize_t rr = read(fd, buf, len-1); 429 if(rr <= 0) { 430 if(rr == 0) { 431 /* EOF */ 432 return 0; 433 } 434 fprintf(stderr, "could not read: %s\n", 435 strerror(errno)); 436 exit(1); 437 } 438 buf[rr] = 0; 439 } 440 return 1; 441} 442 443/** write to ssl or fd, fatalexit on error */ 444static void 445remote_write(SSL* ssl, int fd, const char* buf, size_t len) 446{ 447 if(ssl) { 448#ifdef HAVE_SSL 449 if(SSL_write(ssl, buf, (int)len) <= 0) 450 ssl_err("could not SSL_write"); 451#endif /* HAVE_SSL */ 452 } else { 453 if(write(fd, buf, len) < (ssize_t)len) { 454 fprintf(stderr, "could not write: %s\n", 455 strerror(errno)); 456 exit(1); 457 } 458 } 459} 460 461/** send stdin to server */ 462static void 463send_file(SSL* ssl, int fd, FILE* in, char* buf, size_t sz) 464{ 465 char e[] = {0x04, 0x0a}; 466 while(fgets(buf, (int)sz, in)) { 467 remote_write(ssl, fd, buf, strlen(buf)); 468 } 469 /* send end-of-file marker */ 470 remote_write(ssl, fd, e, sizeof(e)); 471} 472 473/** send command and display result */ 474static int 475go_cmd(SSL* ssl, int fd, int argc, char* argv[]) 476{ 477 char pre[10]; 478 const char* space=" "; 479 const char* newline="\n"; 480 int was_error = 0, first_line = 1; 481 int i; 482 char buf[1024]; 483 snprintf(pre, sizeof(pre), "NSDCT%d ", NSD_CONTROL_VERSION); 484 remote_write(ssl, fd, pre, strlen(pre)); 485 for(i=0; i<argc; i++) { 486 remote_write(ssl, fd, space, strlen(space)); 487 remote_write(ssl, fd, argv[i], strlen(argv[i])); 488 } 489 remote_write(ssl, fd, newline, strlen(newline)); 490 491 /* send contents to server */ 492 if(argc == 1 && (strcmp(argv[0], "addzones") == 0 || 493 strcmp(argv[0], "delzones") == 0)) { 494 send_file(ssl, fd, stdin, buf, sizeof(buf)); 495 } 496 497 while(1) { 498 if(remote_read(ssl, fd, buf, sizeof(buf)) == 0) { 499 break; /* EOF */ 500 } 501 printf("%s", buf); 502 if(first_line && strncmp(buf, "error", 5) == 0) 503 was_error = 1; 504 first_line = 0; 505 } 506 return was_error; 507} 508 509/** go ahead and read config, contact server and perform command and display */ 510static int 511go(const char* cfgfile, char* svr, int argc, char* argv[]) 512{ 513 struct nsd_options* opt; 514 int fd, ret; 515#ifdef HAVE_SSL 516 SSL_CTX* ctx = NULL; 517#endif 518 SSL* ssl = NULL; 519 520 /* read config */ 521 if(!(opt = nsd_options_create(region_create(xalloc, free)))) { 522 fprintf(stderr, "out of memory\n"); 523 exit(1); 524 } 525 tsig_init(opt->region); 526 if(!parse_options_file(opt, cfgfile, NULL, NULL, NULL)) { 527 fprintf(stderr, "could not read config file\n"); 528 exit(1); 529 } 530 if(!opt->control_enable) 531 fprintf(stderr, "warning: control-enable is 'no' in the config file.\n"); 532 resolve_interface_names(opt); 533#ifdef HAVE_SSL 534 ctx = setup_ctx(opt); 535#else 536 if(options_remote_is_address(opt)) { 537 fprintf(stderr, "error: NSD was compiled without SSL.\n"); 538 exit(1); 539 } 540#endif /* HAVE_SSL */ 541 542 /* contact server */ 543 fd = contact_server(svr, opt, argc>0&&strcmp(argv[0],"status")==0); 544#ifdef HAVE_SSL 545 ssl = setup_ssl(ctx, fd); 546#endif 547 548 /* send command */ 549 ret = go_cmd(ssl, fd, argc, argv); 550 551#ifdef HAVE_SSL 552 if(ssl) SSL_free(ssl); 553#endif 554 close(fd); 555#ifdef HAVE_SSL 556 if(ctx) SSL_CTX_free(ctx); 557#endif 558 region_destroy(opt->region); 559 return ret; 560} 561 562/** getopt global, in case header files fail to declare it. */ 563extern int optind; 564/** getopt global, in case header files fail to declare it. */ 565extern char* optarg; 566 567/** Main routine for nsd-control */ 568int main(int argc, char* argv[]) 569{ 570 int c; 571 const char* cfgfile = CONFIGFILE; 572 char* svr = NULL; 573 log_init("nsd-control"); 574 575#ifdef HAVE_SSL 576#ifdef HAVE_ERR_LOAD_CRYPTO_STRINGS 577 ERR_load_crypto_strings(); 578#endif 579#if defined(HAVE_ERR_LOAD_SSL_STRINGS) && !defined(DEPRECATED_ERR_LOAD_SSL_STRINGS) 580 ERR_load_SSL_strings(); 581#endif 582#if OPENSSL_VERSION_NUMBER < 0x10100000 || !defined(HAVE_OPENSSL_INIT_CRYPTO) 583 OpenSSL_add_all_algorithms(); 584#else 585 OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS 586 | OPENSSL_INIT_ADD_ALL_DIGESTS 587 | OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL); 588#endif 589#if OPENSSL_VERSION_NUMBER < 0x10100000 || !defined(HAVE_OPENSSL_INIT_SSL) 590 (void)SSL_library_init(); 591#else 592 OPENSSL_init_ssl(0, NULL); 593#endif 594 595 if(!RAND_status()) { 596 /* try to seed it */ 597 unsigned char buf[256]; 598 unsigned int v, seed=(unsigned)time(NULL) ^ (unsigned)getpid(); 599 size_t i; 600 v = seed; 601 for(i=0; i<256/sizeof(v); i++) { 602 memmove(buf+i*sizeof(v), &v, sizeof(v)); 603 v = v*seed + (unsigned int)i; 604 } 605 RAND_seed(buf, 256); 606 fprintf(stderr, "warning: no entropy, seeding openssl PRNG with time\n"); 607 } 608#endif /* HAVE_SSL */ 609 610 /* parse the options */ 611 while( (c=getopt(argc, argv, "c:s:h")) != -1) { 612 switch(c) { 613 case 'c': 614 cfgfile = optarg; 615 break; 616 case 's': 617 svr = optarg; 618 break; 619 case '?': 620 case 'h': 621 default: 622 usage(); 623 } 624 } 625 argc -= optind; 626 argv += optind; 627 if(argc == 0) 628 usage(); 629 if(argc >= 1 && strcmp(argv[0], "start")==0) { 630 const char *path; 631 if((path = getenv("NSD_PATH")) == NULL) { 632 path = NSD_START_PATH; 633 } 634 if(execl(path, "nsd", "-c", cfgfile, (char*)NULL) < 0) { 635 fprintf(stderr, "could not exec %s: %s\n", 636 NSD_START_PATH, strerror(errno)); 637 exit(1); 638 } 639 } 640 641 return go(cfgfile, svr, argc, argv); 642} 643