2 * checkconf/unbound-control.c - remote control utility for unbound.
4 * Copyright (c) 2008, NLnet Labs. All rights reserved.
6 * This software is open source.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * Redistributions of source code must retain the above copyright notice,
13 * this list of conditions and the following disclaimer.
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.
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.
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.
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.
48 #ifdef HAVE_OPENSSL_SSL_H
49 #include <openssl/ssl.h>
51 #ifdef HAVE_OPENSSL_ERR_H
52 #include <openssl/err.h>
54 #ifdef HAVE_OPENSSL_RAND_H
55 #include <openssl/rand.h>
58 #include "util/config_file.h"
59 #include "util/locks.h"
60 #include "util/net_help.h"
66 /** Give unbound-control usage, and exit (1). */
70 printf("Usage: unbound-control [options] command\n");
71 printf(" Remote control utility for unbound server.\n");
73 printf(" -c file config file, default is %s\n", CONFIGFILE);
74 printf(" -s ip[@port] server address, if omitted config is used.\n");
75 printf(" -q quiet (don't print anything if it works ok).\n");
76 printf(" -h show this usage help.\n");
77 printf("Commands:\n");
78 printf(" start start server; runs unbound(8)\n");
79 printf(" stop stops the server\n");
80 printf(" reload reloads the server\n");
81 printf(" (this flushes data, stats, requestlist)\n");
82 printf(" stats print statistics\n");
83 printf(" stats_noreset peek at statistics\n");
84 printf(" status display status of server\n");
85 printf(" verbosity <number> change logging detail\n");
86 printf(" log_reopen close and open the logfile\n");
87 printf(" local_zone <name> <type> add new local zone\n");
88 printf(" local_zone_remove <name> remove local zone and its contents\n");
89 printf(" local_data <RR data...> add local data, for example\n");
90 printf(" local_data www.example.com A 192.0.2.1\n");
91 printf(" local_data_remove <name> remove local RR data from name\n");
92 printf(" dump_cache print cache to stdout\n");
93 printf(" load_cache load cache from stdin\n");
94 printf(" lookup <name> print nameservers for name\n");
95 printf(" flush <name> flushes common types for name from cache\n");
96 printf(" types: A, AAAA, MX, PTR, NS,\n");
97 printf(" SOA, CNAME, DNAME, SRV, NAPTR\n");
98 printf(" flush_type <name> <type> flush name, type from cache\n");
99 printf(" flush_zone <name> flush everything at or under name\n");
100 printf(" from rr and dnssec caches\n");
101 printf(" flush_bogus flush all bogus data\n");
102 printf(" flush_negative flush all negative data\n");
103 printf(" flush_stats flush statistics, make zero\n");
104 printf(" flush_requestlist drop queries that are worked on\n");
105 printf(" dump_requestlist show what is worked on\n");
106 printf(" flush_infra [all | ip] remove ping, edns for one IP or all\n");
107 printf(" dump_infra show ping and edns entries\n");
108 printf(" set_option opt: val set option to value, no reload\n");
109 printf(" get_option opt get option value\n");
110 printf(" list_stubs list stub-zones and root hints in use\n");
111 printf(" list_forwards list forward-zones in use\n");
112 printf(" list_local_zones list local-zones in use\n");
113 printf(" list_local_data list local-data RRs in use\n");
114 printf(" insecure_add zone add domain-insecure zone\n");
115 printf(" insecure_remove zone remove domain-insecure zone\n");
116 printf(" forward_add [+i] zone addr.. add forward-zone with servers\n");
117 printf(" forward_remove [+i] zone remove forward zone\n");
118 printf(" stub_add [+ip] zone addr.. add stub-zone with servers\n");
119 printf(" stub_remove [+i] zone remove stub zone\n");
120 printf(" +i also do dnssec insecure point\n");
121 printf(" +p set stub to use priming\n");
122 printf(" forward [off | addr ...] without arg show forward setup\n");
123 printf(" or off to turn off root forwarding\n");
124 printf(" or give list of ip addresses\n");
125 printf("Version %s\n", PACKAGE_VERSION);
126 printf("BSD licensed, see LICENSE in source package for details.\n");
127 printf("Report bugs to %s\n", PACKAGE_BUGREPORT);
131 /** exit with ssl error */
132 static void ssl_err(const char* s)
134 fprintf(stderr, "error: %s\n", s);
135 ERR_print_errors_fp(stderr);
139 /** setup SSL context */
141 setup_ctx(struct config_file* cfg)
143 char* s_cert=NULL, *c_key=NULL, *c_cert=NULL;
146 if(cfg->remote_control_use_cert) {
147 s_cert = fname_after_chroot(cfg->server_cert_file, cfg, 1);
148 c_key = fname_after_chroot(cfg->control_key_file, cfg, 1);
149 c_cert = fname_after_chroot(cfg->control_cert_file, cfg, 1);
150 if(!s_cert || !c_key || !c_cert)
151 fatal_exit("out of memory");
153 ctx = SSL_CTX_new(SSLv23_client_method());
155 ssl_err("could not allocate SSL_CTX pointer");
156 if(!(SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2) & SSL_OP_NO_SSLv2))
157 ssl_err("could not set SSL_OP_NO_SSLv2");
158 if(cfg->remote_control_use_cert) {
159 if(!(SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv3) & SSL_OP_NO_SSLv3))
160 ssl_err("could not set SSL_OP_NO_SSLv3");
161 if(!SSL_CTX_use_certificate_file(ctx,c_cert,SSL_FILETYPE_PEM) ||
162 !SSL_CTX_use_PrivateKey_file(ctx,c_key,SSL_FILETYPE_PEM)
163 || !SSL_CTX_check_private_key(ctx))
164 ssl_err("Error setting up SSL_CTX client key and cert");
165 if (SSL_CTX_load_verify_locations(ctx, s_cert, NULL) != 1)
166 ssl_err("Error setting up SSL_CTX verify, server cert");
167 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
173 /* Use ciphers that don't require authentication */
174 if(!SSL_CTX_set_cipher_list(ctx, "aNULL"))
175 ssl_err("Error setting NULL cipher!");
180 /** contact the server with TCP connect */
182 contact_server(const char* svr, struct config_file* cfg, int statuscmd)
184 struct sockaddr_storage addr;
188 /* use svr or the first config entry */
191 svr = cfg->control_ifs->str;
192 else svr = "127.0.0.1";
193 /* config 0 addr (everything), means ask localhost */
194 if(strcmp(svr, "0.0.0.0") == 0)
196 else if(strcmp(svr, "::0") == 0 ||
197 strcmp(svr, "0::0") == 0 ||
198 strcmp(svr, "0::") == 0 ||
199 strcmp(svr, "::") == 0)
202 if(strchr(svr, '@')) {
203 if(!extstrtoaddr(svr, &addr, &addrlen))
204 fatal_exit("could not parse IP@port: %s", svr);
206 } else if(svr[0] == '/') {
207 struct sockaddr_un* usock = (struct sockaddr_un *) &addr;
208 usock->sun_family = AF_LOCAL;
209 #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
210 usock->sun_len = (socklen_t)sizeof(usock);
212 (void)strlcpy(usock->sun_path, svr, sizeof(usock->sun_path));
213 addrlen = (socklen_t)sizeof(struct sockaddr_un);
214 addrfamily = AF_LOCAL;
217 if(!ipstrtoaddr(svr, cfg->control_port, &addr, &addrlen))
218 fatal_exit("could not parse IP: %s", svr);
222 addrfamily = addr_is_ip6(&addr, addrlen)?AF_INET6:AF_INET;
223 fd = socket(addrfamily, SOCK_STREAM, 0);
226 fatal_exit("socket: %s", strerror(errno));
228 fatal_exit("socket: %s", wsa_strerror(WSAGetLastError()));
231 if(connect(fd, (struct sockaddr*)&addr, addrlen) < 0) {
233 log_err_addr("connect", strerror(errno), &addr, addrlen);
234 if(errno == ECONNREFUSED && statuscmd) {
235 printf("unbound is stopped\n");
239 log_err_addr("connect", wsa_strerror(WSAGetLastError()), &addr, addrlen);
240 if(WSAGetLastError() == WSAECONNREFUSED && statuscmd) {
241 printf("unbound is stopped\n");
250 /** setup SSL on the connection */
252 setup_ssl(SSL_CTX* ctx, int fd, struct config_file* cfg)
260 ssl_err("could not SSL_new");
261 SSL_set_connect_state(ssl);
262 (void)SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
263 if(!SSL_set_fd(ssl, fd))
264 ssl_err("could not SSL_set_fd");
267 if( (r=SSL_do_handshake(ssl)) == 1)
269 r = SSL_get_error(ssl, r);
270 if(r != SSL_ERROR_WANT_READ && r != SSL_ERROR_WANT_WRITE)
271 ssl_err("SSL handshake failed");
272 /* wants to be called again */
275 /* check authenticity of server */
276 if(SSL_get_verify_result(ssl) != X509_V_OK)
277 ssl_err("SSL verification failed");
278 if(cfg->remote_control_use_cert) {
279 x = SSL_get_peer_certificate(ssl);
281 ssl_err("Server presented no peer certificate");
288 /** send stdin to server */
290 send_file(SSL* ssl, FILE* in, char* buf, size_t sz)
292 while(fgets(buf, (int)sz, in)) {
293 if(SSL_write(ssl, buf, (int)strlen(buf)) <= 0)
294 ssl_err("could not SSL_write contents");
298 /** send command and display result */
300 go_cmd(SSL* ssl, int quiet, int argc, char* argv[])
303 const char* space=" ";
304 const char* newline="\n";
305 int was_error = 0, first_line = 1;
308 snprintf(pre, sizeof(pre), "UBCT%d ", UNBOUND_CONTROL_VERSION);
309 if(SSL_write(ssl, pre, (int)strlen(pre)) <= 0)
310 ssl_err("could not SSL_write");
311 for(i=0; i<argc; i++) {
312 if(SSL_write(ssl, space, (int)strlen(space)) <= 0)
313 ssl_err("could not SSL_write");
314 if(SSL_write(ssl, argv[i], (int)strlen(argv[i])) <= 0)
315 ssl_err("could not SSL_write");
317 if(SSL_write(ssl, newline, (int)strlen(newline)) <= 0)
318 ssl_err("could not SSL_write");
320 if(argc == 1 && strcmp(argv[0], "load_cache") == 0) {
321 send_file(ssl, stdin, buf, sizeof(buf));
326 if((r = SSL_read(ssl, buf, (int)sizeof(buf)-1)) <= 0) {
327 if(SSL_get_error(ssl, r) == SSL_ERROR_ZERO_RETURN) {
331 ssl_err("could not SSL_read");
334 if(first_line && strncmp(buf, "error", 5) == 0) {
345 /** go ahead and read config, contact server and perform command and display */
347 go(const char* cfgfile, char* svr, int quiet, int argc, char* argv[])
349 struct config_file* cfg;
355 if(!(cfg = config_create()))
356 fatal_exit("out of memory");
357 if(!config_read(cfg, cfgfile, NULL))
358 fatal_exit("could not read config file");
359 if(!cfg->remote_control_enable)
360 log_warn("control-enable is 'no' in the config file.");
361 ctx = setup_ctx(cfg);
364 fd = contact_server(svr, cfg, argc>0&&strcmp(argv[0],"status")==0);
365 ssl = setup_ssl(ctx, fd, cfg);
368 ret = go_cmd(ssl, quiet, argc, argv);
381 /** getopt global, in case header files fail to declare it. */
383 /** getopt global, in case header files fail to declare it. */
386 /** Main routine for unbound-control */
387 int main(int argc, char* argv[])
391 const char* cfgfile = CONFIGFILE;
397 #ifdef USE_THREAD_DEBUG
398 /* stop the file output from unbound-control, overwites the servers */
399 extern int check_locking_order;
400 check_locking_order = 0;
401 #endif /* USE_THREAD_DEBUG */
402 log_ident_set("unbound-control");
403 log_init(NULL, 0, NULL);
406 if((r = WSAStartup(MAKEWORD(2,2), &wsa_data)) != 0)
407 fatal_exit("WSAStartup failed: %s", wsa_strerror(r));
408 /* use registry config file in preference to compiletime location */
409 if(!(cfgfile=w_lookup_reg_str("Software\\Unbound", "ConfigFile")))
410 cfgfile = CONFIGFILE;
413 ERR_load_crypto_strings();
414 ERR_load_SSL_strings();
415 OpenSSL_add_all_algorithms();
416 (void)SSL_library_init();
420 unsigned char buf[256];
421 unsigned int seed=(unsigned)time(NULL) ^ (unsigned)getpid();
422 unsigned int v = seed;
424 for(i=0; i<256/sizeof(v); i++) {
425 memmove(buf+i*sizeof(v), &v, sizeof(v));
426 v = v*seed + (unsigned int)i;
429 log_warn("no entropy, seeding openssl PRNG with time\n");
432 /* parse the options */
433 while( (c=getopt(argc, argv, "c:s:qh")) != -1) {
454 if(argc >= 1 && strcmp(argv[0], "start")==0) {
455 if(execlp("unbound", "unbound", "-c", cfgfile,
457 fatal_exit("could not exec unbound: %s",
462 ret = go(cfgfile, svr, quiet, argc, argv);