2 * checkconf/unbound-checkconf.c - config file checker for unbound.conf file.
4 * Copyright (c) 2007, 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 LIMITED
25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
27 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33 * POSSIBILITY OF SUCH DAMAGE.
39 * The config checker checks for syntax and other errors in the unbound.conf
40 * file, and can be used to check for errors before the server is started
42 * Exit status 1 means an error.
47 #include "util/config_file.h"
48 #include "util/module.h"
49 #include "util/net_help.h"
50 #include "util/regional.h"
51 #include "iterator/iterator.h"
52 #include "iterator/iter_fwd.h"
53 #include "iterator/iter_hints.h"
54 #include "validator/validator.h"
55 #include "services/localzone.h"
62 #ifdef HAVE_SYS_STAT_H
68 #ifdef WITH_PYTHONMODULE
69 #include "pythonmod/pythonmod.h"
72 /** Give checkconf usage, and exit (1). */
76 printf("Usage: unbound-checkconf [file]\n");
77 printf(" Checks unbound configuration file for errors.\n");
78 printf("file if omitted %s is used.\n", CONFIGFILE);
79 printf("-o option print value of option to stdout.\n");
80 printf("-h show this usage help.\n");
81 printf("Version %s\n", PACKAGE_VERSION);
82 printf("BSD licensed, see LICENSE in source package for details.\n");
83 printf("Report bugs to %s\n", PACKAGE_BUGREPORT);
88 * Print given option to stdout
90 * @param opt: option name without trailing :.
91 * This is different from config_set_option.
94 print_option(struct config_file* cfg, const char* opt)
96 if(!config_get_option(cfg, opt, config_print_func, stdout))
97 fatal_exit("cannot print option '%s'", opt);
100 /** check if module works with config */
102 check_mod(struct config_file* cfg, struct module_func_block* fb)
104 struct module_env env;
105 memset(&env, 0, sizeof(env));
107 env.scratch = regional_create();
108 env.scratch_buffer = ldns_buffer_new(BUFSIZ);
109 if(!env.scratch || !env.scratch_buffer)
110 fatal_exit("out of memory");
111 if(!(*fb->init)(&env, 0)) {
112 fatal_exit("bad config for %s module", fb->name);
114 (*fb->deinit)(&env, 0);
115 ldns_buffer_free(env.scratch_buffer);
116 regional_destroy(env.scratch);
119 /** check localzones */
121 localzonechecks(struct config_file* cfg)
123 struct local_zones* zs;
124 if(!(zs = local_zones_create()))
125 fatal_exit("out of memory");
126 if(!local_zones_apply_cfg(zs, cfg))
127 fatal_exit("failed local-zone, local-data configuration");
128 local_zones_delete(zs);
131 /** emit warnings for IP in hosts */
133 warn_hosts(const char* typ, struct config_stub* list)
135 struct sockaddr_storage a;
137 struct config_stub* s;
138 struct config_strlist* h;
139 for(s=list; s; s=s->next) {
140 for(h=s->hosts; h; h=h->next) {
141 if(extstrtoaddr(h->str, &a, &alen)) {
142 fprintf(stderr, "unbound-checkconf: warning:"
143 " %s %s: \"%s\" is an IP%s address, "
144 "and when looked up as a host name "
145 "during use may not resolve.\n",
146 s->name, typ, h->str,
147 addr_is_ip6(&a, alen)?"6":"4");
153 /** check interface strings */
155 interfacechecks(struct config_file* cfg)
157 struct sockaddr_storage a;
160 for(i=0; i<cfg->num_ifs; i++) {
161 if(!extstrtoaddr(cfg->ifs[i], &a, &alen)) {
162 fatal_exit("cannot parse interface specified as '%s'",
165 for(j=0; j<cfg->num_ifs; j++) {
166 if(i!=j && strcmp(cfg->ifs[i], cfg->ifs[j])==0)
167 fatal_exit("interface: %s present twice, "
168 "cannot bind same ports twice.",
172 for(i=0; i<cfg->num_out_ifs; i++) {
173 if(!ipstrtoaddr(cfg->out_ifs[i], UNBOUND_DNS_PORT,
175 fatal_exit("cannot parse outgoing-interface "
176 "specified as '%s'", cfg->out_ifs[i]);
178 for(j=0; j<cfg->num_out_ifs; j++) {
179 if(i!=j && strcmp(cfg->out_ifs[i], cfg->out_ifs[j])==0)
180 fatal_exit("outgoing-interface: %s present "
181 "twice, cannot bind same ports twice.",
189 aclchecks(struct config_file* cfg)
192 struct sockaddr_storage a;
194 struct config_str2list* acl;
195 for(acl=cfg->acls; acl; acl = acl->next) {
196 if(!netblockstrtoaddr(acl->str, UNBOUND_DNS_PORT, &a, &alen,
198 fatal_exit("cannot parse access control address %s %s",
199 acl->str, acl->str2);
204 /** true if fname is a file */
206 is_file(const char* fname)
209 if(stat(fname, &buf) < 0) {
211 printf("warning: no search permission for one of the directories in path: %s\n", fname);
217 if(S_ISDIR(buf.st_mode)) {
218 printf("%s is not a file\n", fname);
224 /** true if fname is a directory */
226 is_dir(const char* fname)
229 if(stat(fname, &buf) < 0) {
231 printf("warning: no search permission for one of the directories in path: %s\n", fname);
237 if(!(S_ISDIR(buf.st_mode))) {
238 printf("%s is not a directory\n", fname);
244 /** get base dir of a fname */
249 if(!fname) fatal_exit("out of memory");
250 rev = strrchr(fname, '/');
251 if(!rev) return NULL;
252 if(fname == rev) return NULL;
257 /** check chroot for a file string */
259 check_chroot_string(const char* desc, char** ss,
260 const char* chrootdir, struct config_file* cfg)
264 *ss = fname_after_chroot(str, cfg, 1);
265 if(!*ss) fatal_exit("out of memory");
267 if(chrootdir && chrootdir[0])
268 fatal_exit("%s: \"%s\" does not exist in "
269 "chrootdir %s", desc, str, chrootdir);
271 fatal_exit("%s: \"%s\" does not exist",
274 /* put in a new full path for continued checking */
279 /** check file list, every file must be inside the chroot location */
281 check_chroot_filelist(const char* desc, struct config_strlist* list,
282 const char* chrootdir, struct config_file* cfg)
284 struct config_strlist* p;
285 for(p=list; p; p=p->next) {
286 check_chroot_string(desc, &p->str, chrootdir, cfg);
290 /** check file list, with wildcard processing */
292 check_chroot_filelist_wild(const char* desc, struct config_strlist* list,
293 const char* chrootdir, struct config_file* cfg)
295 struct config_strlist* p;
296 for(p=list; p; p=p->next) {
298 if(strchr(p->str, '*') || strchr(p->str, '[') ||
299 strchr(p->str, '?') || strchr(p->str, '{') ||
300 strchr(p->str, '~')) {
302 /* adjust whole pattern for chroot and check later */
303 p->str = fname_after_chroot(p->str, cfg, 1);
306 #endif /* HAVE_GLOB */
307 check_chroot_string(desc, &p->str, chrootdir, cfg);
311 /** check configuration for errors */
313 morechecks(struct config_file* cfg, const char* fname)
315 warn_hosts("stub-host", cfg->stubs);
316 warn_hosts("forward-host", cfg->forwards);
317 interfacechecks(cfg);
320 if(cfg->verbosity < 0)
321 fatal_exit("verbosity value < 0");
322 if(cfg->num_threads <= 0 || cfg->num_threads > 10000)
323 fatal_exit("num_threads value weird");
324 if(!cfg->do_ip4 && !cfg->do_ip6)
325 fatal_exit("ip4 and ip6 are both disabled, pointless");
326 if(!cfg->do_udp && !cfg->do_tcp)
327 fatal_exit("udp and tcp are both disabled, pointless");
328 if(cfg->edns_buffer_size > cfg->msg_buffer_size)
329 fatal_exit("edns-buffer-size larger than msg-buffer-size, "
330 "answers will not fit in processing buffer");
332 if(cfg->chrootdir && cfg->chrootdir[0] &&
333 cfg->chrootdir[strlen(cfg->chrootdir)-1] == '/')
334 fatal_exit("chootdir %s has trailing slash '/' please remove.",
336 if(cfg->chrootdir && cfg->chrootdir[0] &&
337 !is_dir(cfg->chrootdir)) {
338 fatal_exit("bad chroot directory");
340 if(cfg->chrootdir && cfg->chrootdir[0]) {
343 if(fname[0] != '/') {
344 if(getcwd(buf, sizeof(buf)) == NULL)
345 fatal_exit("getcwd: %s", strerror(errno));
346 strncat(buf, "/", sizeof(buf)-strlen(buf)-1);
348 strncat(buf, fname, sizeof(buf)-strlen(buf)-1);
349 if(strncmp(buf, cfg->chrootdir, strlen(cfg->chrootdir)) != 0)
350 fatal_exit("config file %s is not inside chroot %s",
351 buf, cfg->chrootdir);
353 if(cfg->directory && cfg->directory[0]) {
354 char* ad = fname_after_chroot(cfg->directory, cfg, 0);
355 if(!ad) fatal_exit("out of memory");
356 if(!is_dir(ad)) fatal_exit("bad chdir directory");
359 if( (cfg->chrootdir && cfg->chrootdir[0]) ||
360 (cfg->directory && cfg->directory[0])) {
361 if(cfg->pidfile && cfg->pidfile[0]) {
362 char* ad = (cfg->pidfile[0]=='/')?strdup(cfg->pidfile):
363 fname_after_chroot(cfg->pidfile, cfg, 1);
364 char* bd = basedir(ad);
365 if(bd && !is_dir(bd))
366 fatal_exit("pidfile directory does not exist");
369 if(cfg->logfile && cfg->logfile[0]) {
370 char* ad = fname_after_chroot(cfg->logfile, cfg, 1);
371 char* bd = basedir(ad);
372 if(bd && !is_dir(bd))
373 fatal_exit("logfile directory does not exist");
378 check_chroot_filelist("file with root-hints",
379 cfg->root_hints, cfg->chrootdir, cfg);
380 check_chroot_filelist("trust-anchor-file",
381 cfg->trust_anchor_file_list, cfg->chrootdir, cfg);
382 check_chroot_filelist("auto-trust-anchor-file",
383 cfg->auto_trust_anchor_file_list, cfg->chrootdir, cfg);
384 check_chroot_filelist_wild("trusted-keys-file",
385 cfg->trusted_keys_file_list, cfg->chrootdir, cfg);
386 check_chroot_string("dlv-anchor-file", &cfg->dlv_anchor_file,
387 cfg->chrootdir, cfg);
388 /* remove chroot setting so that modules are not stripping pathnames*/
389 free(cfg->chrootdir);
390 cfg->chrootdir = NULL;
392 if(strcmp(cfg->module_conf, "iterator") != 0
393 && strcmp(cfg->module_conf, "validator iterator") != 0
394 #ifdef WITH_PYTHONMODULE
395 && strcmp(cfg->module_conf, "python iterator") != 0
396 && strcmp(cfg->module_conf, "python validator iterator") != 0
397 && strcmp(cfg->module_conf, "validator python iterator") != 0
400 fatal_exit("module conf '%s' is not known to work",
405 if(cfg->username && cfg->username[0]) {
406 if(getpwnam(cfg->username) == NULL)
407 fatal_exit("user '%s' does not exist.", cfg->username);
411 if(cfg->remote_control_enable) {
412 check_chroot_string("server-key-file", &cfg->server_key_file,
413 cfg->chrootdir, cfg);
414 check_chroot_string("server-cert-file", &cfg->server_cert_file,
415 cfg->chrootdir, cfg);
416 if(!is_file(cfg->control_key_file))
417 fatal_exit("control-key-file: \"%s\" does not exist",
418 cfg->control_key_file);
419 if(!is_file(cfg->control_cert_file))
420 fatal_exit("control-cert-file: \"%s\" does not exist",
421 cfg->control_cert_file);
424 localzonechecks(cfg);
427 /** check forwards */
429 check_fwd(struct config_file* cfg)
431 struct iter_forwards* fwd = forwards_create();
432 if(!fwd || !forwards_apply_cfg(fwd, cfg)) {
433 fatal_exit("Could not set forward zones");
435 forwards_delete(fwd);
440 check_hints(struct config_file* cfg)
442 struct iter_hints* hints = hints_create();
443 if(!hints || !hints_apply_cfg(hints, cfg)) {
444 fatal_exit("Could not set root or stub hints");
449 /** check config file */
451 checkconf(const char* cfgfile, const char* opt)
453 struct config_file* cfg = config_create();
455 fatal_exit("out of memory");
456 if(!config_read(cfg, cfgfile, NULL)) {
457 /* config_read prints messages to stderr */
461 morechecks(cfg, cfgfile);
462 check_mod(cfg, iter_get_funcblock());
463 check_mod(cfg, val_get_funcblock());
464 #ifdef WITH_PYTHONMODULE
465 if(strstr(cfg->module_conf, "python"))
466 check_mod(cfg, pythonmod_get_funcblock());
470 if(opt) print_option(cfg, opt);
471 else printf("unbound-checkconf: no errors in %s\n", cfgfile);
475 /** getopt global, in case header files fail to declare it. */
477 /** getopt global, in case header files fail to declare it. */
480 /** Main routine for checkconf */
481 int main(int argc, char* argv[])
485 const char* opt = NULL;
486 const char* cfgfile = CONFIGFILE;
487 log_ident_set("unbound-checkconf");
488 log_init(NULL, 0, NULL);
491 /* use registry config file in preference to compiletime location */
492 if(!(cfgfile=w_lookup_reg_str("Software\\Unbound", "ConfigFile")))
493 cfgfile = CONFIGFILE;
494 #endif /* USE_WINSOCK */
495 /* parse the options */
496 while( (c=getopt(argc, argv, "ho:")) != -1) {
509 if(argc != 0 && argc != 1)