643 lines
18 KiB
C
643 lines
18 KiB
C
/*
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* nsd-control.c - remote control utility for nsd.
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*
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* Copyright (c) 2011, 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 nsd 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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#include <stdio.h>
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#include <stdlib.h>
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struct region;
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struct domain_table;
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struct zone;
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struct domain;
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int zonec_parse_string(struct region* ATTR_UNUSED(region),
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struct domain_table* ATTR_UNUSED(domains),
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struct zone* ATTR_UNUSED(zone), char* ATTR_UNUSED(str),
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struct domain** ATTR_UNUSED(parsed), int* ATTR_UNUSED(num_rrs))
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{
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return 0;
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}
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#include <sys/types.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#ifdef HAVE_SSL
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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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#endif /* HAVE_SSL */
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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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#include <fcntl.h>
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#ifndef AF_LOCAL
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#define AF_LOCAL AF_UNIX
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#endif
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#include "util.h"
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#include "tsig.h"
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#include "options.h"
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#include "zonec.h"
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static void usage(void) ATTR_NORETURN;
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#ifdef HAVE_SSL
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static void ssl_err(const char* s) ATTR_NORETURN;
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static void ssl_path_err(const char* s, const char *path) ATTR_NORETURN;
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#else
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/* define SSL to use as a boolean to turn it off in function calls. */
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#define SSL int
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#endif
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/** timeout to wait for connection over stream, in msec */
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#define NSD_CONTROL_CONNECT_TIMEOUT 5000
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/** Give nsd-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: nsd-control [options] command\n");
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printf(" Remote control utility for nsd server.\n");
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printf("Version %s. Report bugs to <%s>.\n",
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PACKAGE_VERSION, PACKAGE_BUGREPORT);
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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(" -h show this usage help.\n");
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printf("Commands:\n");
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printf(" start start server; runs nsd(8)\n");
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printf(" stop stops the server\n");
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printf(" reload [<zone>] reload modified zonefiles from disk\n");
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printf(" reconfig reload the config file\n");
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printf(" repattern the same as reconfig\n");
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printf(" log_reopen reopen logfile (for log rotate)\n");
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printf(" status display status of server\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(" addzone <name> <pattern> add a new zone\n");
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printf(" delzone <name> remove a zone\n");
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printf(" changezone <name> <pattern> change zone to use pattern\n");
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printf(" addzones add zone list on stdin {name space pattern newline}\n");
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printf(" delzones remove zone list on stdin {name newline}\n");
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printf(" write [<zone>] write changed zonefiles to disk\n");
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printf(" notify [<zone>] send NOTIFY messages to slave servers\n");
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printf(" transfer [<zone>] try to update slave zones to newer serial\n");
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printf(" force_transfer [<zone>] update slave zones with AXFR, no serial check\n");
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printf(" zonestatus [<zone>] print state, serial, activity\n");
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printf(" serverpid get pid of server process\n");
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printf(" verbosity <number> change logging detail\n");
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printf(" print_tsig [<key_name>] print tsig with <name> the secret and algo\n");
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printf(" update_tsig <name> <secret> change existing tsig with <name> to a new <secret>\n");
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printf(" add_tsig <name> <secret> [algo] add new key with the given parameters\n");
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printf(" assoc_tsig <zone> <key_name> associate <zone> with given tsig <key_name> name\n");
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printf(" del_tsig <key_name> delete tsig <key_name> from configuration\n");
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printf(" add_cookie_secret <secret> add (or replace) a new cookie secret <secret>\n");
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printf(" drop_cookie_secret drop a staging cookie secret\n");
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printf(" activate_cookie_secret make a staging cookie secret active\n");
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printf(" print_cookie_secrets show all cookie secrets with their status\n");
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exit(1);
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}
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#ifdef HAVE_SSL
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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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/** exit with ssl error related to a file path */
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static void ssl_path_err(const char* s, const char *path)
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{
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unsigned long err;
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err = ERR_peek_error();
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if (ERR_GET_LIB(err) == ERR_LIB_SYS) {
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fprintf(stderr, "error: %s\n%s: %s\n",
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s, path, ERR_reason_error_string(err));
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exit(1);
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} else {
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ssl_err(s);
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}
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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 nsd_options* cfg)
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{
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char* s_cert, *c_key, *c_cert;
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SSL_CTX* ctx;
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if(!options_remote_is_address(cfg))
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return NULL;
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s_cert = cfg->server_cert_file;
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c_key = cfg->control_key_file;
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c_cert = cfg->control_cert_file;
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/* filenames may be relative to zonesdir */
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if (cfg->zonesdir && cfg->zonesdir[0] &&
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(s_cert[0] != '/' || c_key[0] != '/' || c_cert[0] != '/')) {
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if(chdir(cfg->zonesdir))
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error("could not chdir to zonesdir: %s %s",
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cfg->zonesdir, strerror(errno));
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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_OP_NO_SSLv2 != 0
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if((SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2) & SSL_OP_NO_SSLv2)
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!= SSL_OP_NO_SSLv2)
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ssl_err("could not set SSL_OP_NO_SSLv2");
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#endif
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if((SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv3) & SSL_OP_NO_SSLv3)
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!= SSL_OP_NO_SSLv3)
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ssl_err("could not set SSL_OP_NO_SSLv3");
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#if defined(SSL_OP_NO_RENEGOTIATION)
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/* disable client renegotiation */
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if((SSL_CTX_set_options(ctx, SSL_OP_NO_RENEGOTIATION) &
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SSL_OP_NO_RENEGOTIATION) != SSL_OP_NO_RENEGOTIATION)
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ssl_err("could not set SSL_OP_NO_RENEGOTIATION");
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#endif
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if(!SSL_CTX_use_certificate_file(ctx,c_cert,SSL_FILETYPE_PEM))
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ssl_path_err("Error setting up SSL_CTX client cert", c_cert);
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if(!SSL_CTX_use_PrivateKey_file(ctx,c_key,SSL_FILETYPE_PEM))
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ssl_path_err("Error setting up SSL_CTX client key", c_key);
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if(!SSL_CTX_check_private_key(ctx))
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ssl_err("Error setting up SSL_CTX client key");
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if (SSL_CTX_load_verify_locations(ctx, s_cert, NULL) != 1)
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ssl_path_err("Error setting up SSL_CTX verify, server cert",
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s_cert);
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SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
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return ctx;
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}
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#endif /* HAVE_SSL */
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/** check connect error */
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static void
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checkconnecterr(int err, const char* svr, int port, int statuscmd)
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{
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if(!port) fprintf(stderr, "error: connect (%s): %s\n", svr,
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strerror(err));
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else fprintf(stderr, "error: connect (%s@%d): %s\n", svr, port,
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strerror(err));
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if(err == ECONNREFUSED && statuscmd) {
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printf("nsd is stopped\n");
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exit(3);
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}
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exit(1);
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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 nsd_options* cfg, int statuscmd)
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{
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#ifdef INET6
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struct sockaddr_storage addr;
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#else
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struct sockaddr_in addr;
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#endif
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socklen_t addrlen;
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int fd;
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int port = cfg->control_port;
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int addrfamily = 0;
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/* use svr or a config entry */
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if(!svr) {
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if(cfg->control_interface) {
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svr = cfg->control_interface->address;
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} else if(cfg->do_ip4) {
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svr = "127.0.0.1";
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} else {
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svr = "::1";
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}
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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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char* ps = strchr(svr, '@');
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*ps++ = 0;
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port = atoi(ps);
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if(!port) {
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fprintf(stderr, "could not parse port %s\n", ps);
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exit(1);
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}
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}
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if(svr[0] == '/') {
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#ifdef HAVE_SYS_UN_H
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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 = (unsigned)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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port = 0;
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#endif
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#ifdef INET6
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} else if(strchr(svr, ':')) {
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struct sockaddr_in6 sa;
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addrlen = (socklen_t)sizeof(struct sockaddr_in6);
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memset(&sa, 0, addrlen);
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sa.sin6_family = AF_INET6;
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sa.sin6_port = (in_port_t)htons((uint16_t)port);
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if(inet_pton((int)sa.sin6_family, svr, &sa.sin6_addr) <= 0) {
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fprintf(stderr, "could not parse IP: %s\n", svr);
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exit(1);
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}
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memcpy(&addr, &sa, addrlen);
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addrfamily = AF_INET6;
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#endif
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} else { /* ip4 */
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struct sockaddr_in sa;
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addrlen = (socklen_t)sizeof(struct sockaddr_in);
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memset(&sa, 0, addrlen);
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sa.sin_family = AF_INET;
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sa.sin_port = (in_port_t)htons((uint16_t)port);
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if(inet_pton((int)sa.sin_family, svr, &sa.sin_addr) <= 0) {
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fprintf(stderr, "could not parse IP: %s\n", svr);
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exit(1);
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}
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memcpy(&addr, &sa, addrlen);
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addrfamily = AF_INET;
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}
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fd = socket(addrfamily, SOCK_STREAM, 0);
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if(fd == -1) {
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fprintf(stderr, "socket: %s\n", strerror(errno));
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exit(1);
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}
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if(fcntl(fd, F_SETFL, O_NONBLOCK) == -1) {
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fprintf(stderr, "error: set nonblocking: fcntl: %s",
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strerror(errno));
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}
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if(connect(fd, (struct sockaddr*)&addr, addrlen) < 0) {
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if(errno != EINPROGRESS) {
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checkconnecterr(errno, svr, port, statuscmd);
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}
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}
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while(1) {
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fd_set rset, wset, eset;
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struct timeval tv;
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FD_ZERO(&rset);
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FD_SET(fd, &rset);
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FD_ZERO(&wset);
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FD_SET(fd, &wset);
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FD_ZERO(&eset);
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FD_SET(fd, &eset);
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tv.tv_sec = NSD_CONTROL_CONNECT_TIMEOUT/1000;
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tv.tv_usec= (NSD_CONTROL_CONNECT_TIMEOUT%1000)*1000;
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if(select(fd+1, &rset, &wset, &eset, &tv) == -1) {
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fprintf(stderr, "select: %s\n", strerror(errno));
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exit(1);
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}
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if(!FD_ISSET(fd, &rset) && !FD_ISSET(fd, &wset) &&
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!FD_ISSET(fd, &eset)) {
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fprintf(stderr, "timeout: could not connect to server\n");
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exit(1);
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} else {
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/* check nonblocking connect error */
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int error = 0;
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socklen_t len = (socklen_t)sizeof(error);
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if(getsockopt(fd, SOL_SOCKET, SO_ERROR, (void*)&error,
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&len) < 0) {
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error = errno; /* on solaris errno is error */
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}
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if(error != 0) {
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if(error == EINPROGRESS || error == EWOULDBLOCK)
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continue; /* try again later */
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checkconnecterr(error, svr, port, statuscmd);
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}
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}
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break;
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}
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if(fcntl(fd, F_SETFL, 0) == -1) {
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fprintf(stderr, "error: set blocking: fcntl: %s",
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strerror(errno));
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}
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return fd;
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}
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#ifdef HAVE_SSL
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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)
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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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if(!ctx) return NULL;
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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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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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return ssl;
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}
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#endif /* HAVE_SSL */
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/** read from ssl or fd, fatalexit on error, 0 EOF, 1 success */
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static int
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remote_read(SSL* ssl, int fd, char* buf, size_t len)
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{
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if(ssl) {
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#ifdef HAVE_SSL
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int r;
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ERR_clear_error();
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if((r = SSL_read(ssl, buf, (int)len-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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return 0;
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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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#endif /* HAVE_SSL */
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} else {
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ssize_t rr = read(fd, buf, len-1);
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if(rr <= 0) {
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if(rr == 0) {
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/* EOF */
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return 0;
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}
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fprintf(stderr, "could not read: %s\n",
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strerror(errno));
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exit(1);
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}
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buf[rr] = 0;
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}
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return 1;
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}
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/** write to ssl or fd, fatalexit on error */
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static void
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remote_write(SSL* ssl, int fd, const char* buf, size_t len)
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{
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if(ssl) {
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#ifdef HAVE_SSL
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if(SSL_write(ssl, buf, (int)len) <= 0)
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ssl_err("could not SSL_write");
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#endif /* HAVE_SSL */
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} else {
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if(write(fd, buf, len) < (ssize_t)len) {
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fprintf(stderr, "could not write: %s\n",
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strerror(errno));
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exit(1);
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}
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}
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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, int fd, FILE* in, char* buf, size_t sz)
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{
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char e[] = {0x04, 0x0a};
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while(fgets(buf, (int)sz, in)) {
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remote_write(ssl, fd, buf, strlen(buf));
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}
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/* send end-of-file marker */
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remote_write(ssl, fd, e, sizeof(e));
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}
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|
|
/** send command and display result */
|
|
static int
|
|
go_cmd(SSL* ssl, int fd, int argc, char* argv[])
|
|
{
|
|
char pre[10];
|
|
const char* space=" ";
|
|
const char* newline="\n";
|
|
int was_error = 0, first_line = 1;
|
|
int i;
|
|
char buf[1024];
|
|
snprintf(pre, sizeof(pre), "NSDCT%d ", NSD_CONTROL_VERSION);
|
|
remote_write(ssl, fd, pre, strlen(pre));
|
|
for(i=0; i<argc; i++) {
|
|
remote_write(ssl, fd, space, strlen(space));
|
|
remote_write(ssl, fd, argv[i], strlen(argv[i]));
|
|
}
|
|
remote_write(ssl, fd, newline, strlen(newline));
|
|
|
|
/* send contents to server */
|
|
if(argc == 1 && (strcmp(argv[0], "addzones") == 0 ||
|
|
strcmp(argv[0], "delzones") == 0)) {
|
|
send_file(ssl, fd, stdin, buf, sizeof(buf));
|
|
}
|
|
|
|
while(1) {
|
|
if(remote_read(ssl, fd, buf, sizeof(buf)) == 0) {
|
|
break; /* EOF */
|
|
}
|
|
printf("%s", buf);
|
|
if(first_line && strncmp(buf, "error", 5) == 0)
|
|
was_error = 1;
|
|
first_line = 0;
|
|
}
|
|
return was_error;
|
|
}
|
|
|
|
/** go ahead and read config, contact server and perform command and display */
|
|
static int
|
|
go(const char* cfgfile, char* svr, int argc, char* argv[])
|
|
{
|
|
struct nsd_options* opt;
|
|
int fd, ret;
|
|
#ifdef HAVE_SSL
|
|
SSL_CTX* ctx = NULL;
|
|
#endif
|
|
SSL* ssl = NULL;
|
|
|
|
/* read config */
|
|
if(!(opt = nsd_options_create(region_create(xalloc, free)))) {
|
|
fprintf(stderr, "out of memory\n");
|
|
exit(1);
|
|
}
|
|
tsig_init(opt->region);
|
|
if(!parse_options_file(opt, cfgfile, NULL, NULL)) {
|
|
fprintf(stderr, "could not read config file\n");
|
|
exit(1);
|
|
}
|
|
if(!opt->control_enable)
|
|
fprintf(stderr, "warning: control-enable is 'no' in the config file.\n");
|
|
resolve_interface_names(opt);
|
|
#ifdef HAVE_SSL
|
|
ctx = setup_ctx(opt);
|
|
#else
|
|
if(options_remote_is_address(opt)) {
|
|
fprintf(stderr, "error: NSD was compiled without SSL.\n");
|
|
exit(1);
|
|
}
|
|
#endif /* HAVE_SSL */
|
|
|
|
/* contact server */
|
|
fd = contact_server(svr, opt, argc>0&&strcmp(argv[0],"status")==0);
|
|
#ifdef HAVE_SSL
|
|
ssl = setup_ssl(ctx, fd);
|
|
#endif
|
|
|
|
/* send command */
|
|
ret = go_cmd(ssl, fd, argc, argv);
|
|
|
|
#ifdef HAVE_SSL
|
|
if(ssl) SSL_free(ssl);
|
|
#endif
|
|
close(fd);
|
|
#ifdef HAVE_SSL
|
|
if(ctx) SSL_CTX_free(ctx);
|
|
#endif
|
|
region_destroy(opt->region);
|
|
return ret;
|
|
}
|
|
|
|
/** getopt global, in case header files fail to declare it. */
|
|
extern int optind;
|
|
/** getopt global, in case header files fail to declare it. */
|
|
extern char* optarg;
|
|
|
|
/** Main routine for nsd-control */
|
|
int main(int argc, char* argv[])
|
|
{
|
|
int c;
|
|
const char* cfgfile = CONFIGFILE;
|
|
char* svr = NULL;
|
|
log_init("nsd-control");
|
|
|
|
#ifdef HAVE_SSL
|
|
#ifdef HAVE_ERR_LOAD_CRYPTO_STRINGS
|
|
ERR_load_crypto_strings();
|
|
#endif
|
|
#if defined(HAVE_ERR_LOAD_SSL_STRINGS) && !defined(DEPRECATED_ERR_LOAD_SSL_STRINGS)
|
|
ERR_load_SSL_strings();
|
|
#endif
|
|
#if OPENSSL_VERSION_NUMBER < 0x10100000 || !defined(HAVE_OPENSSL_INIT_CRYPTO)
|
|
OpenSSL_add_all_algorithms();
|
|
#else
|
|
OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS
|
|
| OPENSSL_INIT_ADD_ALL_DIGESTS
|
|
| OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL);
|
|
#endif
|
|
#if OPENSSL_VERSION_NUMBER < 0x10100000 || !defined(HAVE_OPENSSL_INIT_SSL)
|
|
(void)SSL_library_init();
|
|
#else
|
|
OPENSSL_init_ssl(0, NULL);
|
|
#endif
|
|
|
|
if(!RAND_status()) {
|
|
/* try to seed it */
|
|
unsigned char buf[256];
|
|
unsigned int v, seed=(unsigned)time(NULL) ^ (unsigned)getpid();
|
|
size_t i;
|
|
v = seed;
|
|
for(i=0; i<256/sizeof(v); i++) {
|
|
memmove(buf+i*sizeof(v), &v, sizeof(v));
|
|
v = v*seed + (unsigned int)i;
|
|
}
|
|
RAND_seed(buf, 256);
|
|
fprintf(stderr, "warning: no entropy, seeding openssl PRNG with time\n");
|
|
}
|
|
#endif /* HAVE_SSL */
|
|
|
|
/* parse the options */
|
|
while( (c=getopt(argc, argv, "c:s:h")) != -1) {
|
|
switch(c) {
|
|
case 'c':
|
|
cfgfile = optarg;
|
|
break;
|
|
case 's':
|
|
svr = optarg;
|
|
break;
|
|
case '?':
|
|
case 'h':
|
|
default:
|
|
usage();
|
|
}
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
if(argc == 0)
|
|
usage();
|
|
if(argc >= 1 && strcmp(argv[0], "start")==0) {
|
|
const char *path;
|
|
if((path = getenv("NSD_PATH")) == NULL) {
|
|
path = NSD_START_PATH;
|
|
}
|
|
if(execl(path, "nsd", "-c", cfgfile, (char*)NULL) < 0) {
|
|
fprintf(stderr, "could not exec %s: %s\n",
|
|
NSD_START_PATH, strerror(errno));
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
return go(cfgfile, svr, argc, argv);
|
|
}
|