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Member "nsd-4.3.6/nsd-control.c" (6 Apr 2021, 16920 Bytes) of package /linux/misc/dns/nsd-4.3.6.tar.gz:


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