542 lines
15 KiB
C
542 lines
15 KiB
C
/*
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* checkconf/unbound-checkconf.c - config file checker for unbound.conf file.
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*
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* Copyright (c) 2007, 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 config checker checks for syntax and other errors in the unbound.conf
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* file, and can be used to check for errors before the server is started
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* or sigHUPped.
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* Exit status 1 means an error.
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*/
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#include "config.h"
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#include "util/log.h"
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#include "util/config_file.h"
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#include "util/module.h"
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#include "util/net_help.h"
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#include "util/regional.h"
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#include "iterator/iterator.h"
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#include "iterator/iter_fwd.h"
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#include "iterator/iter_hints.h"
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#include "validator/validator.h"
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#include "services/localzone.h"
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#include "sldns/sbuffer.h"
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#ifdef HAVE_GETOPT_H
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#include <getopt.h>
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#endif
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#ifdef HAVE_PWD_H
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#include <pwd.h>
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#endif
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#ifdef HAVE_GLOB_H
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#include <glob.h>
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#endif
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#ifdef WITH_PYTHONMODULE
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#include "pythonmod/pythonmod.h"
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#endif
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/** Give checkconf 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: unbound-checkconf [file]\n");
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printf(" Checks unbound configuration file for errors.\n");
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printf("file if omitted %s is used.\n", CONFIGFILE);
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printf("-o option print value of option to stdout.\n");
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printf("-f output full pathname with chroot applied, eg. with -o pidfile.\n");
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printf("-h show this usage help.\n");
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printf("Version %s\n", PACKAGE_VERSION);
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printf("BSD licensed, see LICENSE in source package for details.\n");
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printf("Report bugs to %s\n", PACKAGE_BUGREPORT);
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exit(1);
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}
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/**
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* Print given option to stdout
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* @param cfg: config
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* @param opt: option name without trailing :.
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* This is different from config_set_option.
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* @param final: if final pathname with chroot applied has to be printed.
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*/
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static void
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print_option(struct config_file* cfg, const char* opt, int final)
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{
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if(strcmp(opt, "pidfile") == 0 && final) {
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printf("%s\n", fname_after_chroot(cfg->pidfile, cfg, 1));
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return;
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}
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if(!config_get_option(cfg, opt, config_print_func, stdout))
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fatal_exit("cannot print option '%s'", opt);
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}
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/** check if module works with config */
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static void
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check_mod(struct config_file* cfg, struct module_func_block* fb)
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{
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struct module_env env;
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memset(&env, 0, sizeof(env));
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env.cfg = cfg;
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env.scratch = regional_create();
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env.scratch_buffer = sldns_buffer_new(BUFSIZ);
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if(!env.scratch || !env.scratch_buffer)
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fatal_exit("out of memory");
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if(!(*fb->init)(&env, 0)) {
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fatal_exit("bad config for %s module", fb->name);
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}
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(*fb->deinit)(&env, 0);
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sldns_buffer_free(env.scratch_buffer);
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regional_destroy(env.scratch);
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}
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/** check localzones */
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static void
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localzonechecks(struct config_file* cfg)
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{
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struct local_zones* zs;
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if(!(zs = local_zones_create()))
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fatal_exit("out of memory");
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if(!local_zones_apply_cfg(zs, cfg))
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fatal_exit("failed local-zone, local-data configuration");
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local_zones_delete(zs);
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}
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/** emit warnings for IP in hosts */
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static void
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warn_hosts(const char* typ, struct config_stub* list)
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{
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struct sockaddr_storage a;
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socklen_t alen;
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struct config_stub* s;
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struct config_strlist* h;
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for(s=list; s; s=s->next) {
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for(h=s->hosts; h; h=h->next) {
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if(extstrtoaddr(h->str, &a, &alen)) {
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fprintf(stderr, "unbound-checkconf: warning:"
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" %s %s: \"%s\" is an IP%s address, "
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"and when looked up as a host name "
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"during use may not resolve.\n",
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s->name, typ, h->str,
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addr_is_ip6(&a, alen)?"6":"4");
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}
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}
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}
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}
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/** check interface strings */
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static void
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interfacechecks(struct config_file* cfg)
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{
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struct sockaddr_storage a;
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socklen_t alen;
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int i, j;
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for(i=0; i<cfg->num_ifs; i++) {
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if(!extstrtoaddr(cfg->ifs[i], &a, &alen)) {
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fatal_exit("cannot parse interface specified as '%s'",
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cfg->ifs[i]);
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}
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for(j=0; j<cfg->num_ifs; j++) {
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if(i!=j && strcmp(cfg->ifs[i], cfg->ifs[j])==0)
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fatal_exit("interface: %s present twice, "
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"cannot bind same ports twice.",
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cfg->ifs[i]);
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}
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}
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for(i=0; i<cfg->num_out_ifs; i++) {
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if(!ipstrtoaddr(cfg->out_ifs[i], UNBOUND_DNS_PORT,
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&a, &alen)) {
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fatal_exit("cannot parse outgoing-interface "
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"specified as '%s'", cfg->out_ifs[i]);
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}
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for(j=0; j<cfg->num_out_ifs; j++) {
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if(i!=j && strcmp(cfg->out_ifs[i], cfg->out_ifs[j])==0)
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fatal_exit("outgoing-interface: %s present "
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"twice, cannot bind same ports twice.",
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cfg->out_ifs[i]);
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}
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}
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}
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/** check acl ips */
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static void
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aclchecks(struct config_file* cfg)
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{
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int d;
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struct sockaddr_storage a;
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socklen_t alen;
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struct config_str2list* acl;
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for(acl=cfg->acls; acl; acl = acl->next) {
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if(!netblockstrtoaddr(acl->str, UNBOUND_DNS_PORT, &a, &alen,
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&d)) {
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fatal_exit("cannot parse access control address %s %s",
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acl->str, acl->str2);
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}
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}
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}
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/** true if fname is a file */
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static int
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is_file(const char* fname)
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{
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struct stat buf;
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if(stat(fname, &buf) < 0) {
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if(errno==EACCES) {
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printf("warning: no search permission for one of the directories in path: %s\n", fname);
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return 1;
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}
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perror(fname);
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return 0;
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}
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if(S_ISDIR(buf.st_mode)) {
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printf("%s is not a file\n", fname);
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return 0;
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}
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return 1;
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}
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/** true if fname is a directory */
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static int
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is_dir(const char* fname)
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{
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struct stat buf;
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if(stat(fname, &buf) < 0) {
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if(errno==EACCES) {
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printf("warning: no search permission for one of the directories in path: %s\n", fname);
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return 1;
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}
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perror(fname);
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return 0;
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}
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if(!(S_ISDIR(buf.st_mode))) {
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printf("%s is not a directory\n", fname);
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return 0;
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}
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return 1;
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}
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/** get base dir of a fname */
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static char*
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basedir(char* fname)
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{
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char* rev;
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if(!fname) fatal_exit("out of memory");
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rev = strrchr(fname, '/');
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if(!rev) return NULL;
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if(fname == rev) return NULL;
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rev[0] = 0;
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return fname;
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}
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/** check chroot for a file string */
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static void
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check_chroot_string(const char* desc, char** ss,
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const char* chrootdir, struct config_file* cfg)
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{
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char* str = *ss;
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if(str && str[0]) {
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*ss = fname_after_chroot(str, cfg, 1);
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if(!*ss) fatal_exit("out of memory");
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if(!is_file(*ss)) {
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if(chrootdir && chrootdir[0])
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fatal_exit("%s: \"%s\" does not exist in "
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"chrootdir %s", desc, str, chrootdir);
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else
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fatal_exit("%s: \"%s\" does not exist",
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desc, str);
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}
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/* put in a new full path for continued checking */
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free(str);
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}
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}
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/** check file list, every file must be inside the chroot location */
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static void
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check_chroot_filelist(const char* desc, struct config_strlist* list,
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const char* chrootdir, struct config_file* cfg)
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{
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struct config_strlist* p;
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for(p=list; p; p=p->next) {
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check_chroot_string(desc, &p->str, chrootdir, cfg);
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}
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}
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/** check file list, with wildcard processing */
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static void
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check_chroot_filelist_wild(const char* desc, struct config_strlist* list,
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const char* chrootdir, struct config_file* cfg)
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{
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struct config_strlist* p;
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for(p=list; p; p=p->next) {
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#ifdef HAVE_GLOB
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if(strchr(p->str, '*') || strchr(p->str, '[') ||
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strchr(p->str, '?') || strchr(p->str, '{') ||
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strchr(p->str, '~')) {
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char* s = p->str;
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/* adjust whole pattern for chroot and check later */
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p->str = fname_after_chroot(p->str, cfg, 1);
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free(s);
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} else
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#endif /* HAVE_GLOB */
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check_chroot_string(desc, &p->str, chrootdir, cfg);
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}
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}
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/** check configuration for errors */
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static void
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morechecks(struct config_file* cfg, const char* fname)
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{
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warn_hosts("stub-host", cfg->stubs);
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warn_hosts("forward-host", cfg->forwards);
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interfacechecks(cfg);
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aclchecks(cfg);
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if(cfg->verbosity < 0)
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fatal_exit("verbosity value < 0");
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if(cfg->num_threads <= 0 || cfg->num_threads > 10000)
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fatal_exit("num_threads value weird");
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if(!cfg->do_ip4 && !cfg->do_ip6)
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fatal_exit("ip4 and ip6 are both disabled, pointless");
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if(!cfg->do_udp && !cfg->do_tcp)
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fatal_exit("udp and tcp are both disabled, pointless");
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if(cfg->edns_buffer_size > cfg->msg_buffer_size)
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fatal_exit("edns-buffer-size larger than msg-buffer-size, "
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"answers will not fit in processing buffer");
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#ifdef UB_ON_WINDOWS
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w_config_adjust_directory(cfg);
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#endif
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if(cfg->chrootdir && cfg->chrootdir[0] &&
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cfg->chrootdir[strlen(cfg->chrootdir)-1] == '/')
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fatal_exit("chootdir %s has trailing slash '/' please remove.",
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cfg->chrootdir);
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if(cfg->chrootdir && cfg->chrootdir[0] &&
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!is_dir(cfg->chrootdir)) {
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fatal_exit("bad chroot directory");
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}
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if(cfg->chrootdir && cfg->chrootdir[0]) {
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char buf[10240];
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buf[0] = 0;
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if(fname[0] != '/') {
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if(getcwd(buf, sizeof(buf)) == NULL)
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fatal_exit("getcwd: %s", strerror(errno));
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(void)strlcat(buf, "/", sizeof(buf));
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}
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(void)strlcat(buf, fname, sizeof(buf));
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if(strncmp(buf, cfg->chrootdir, strlen(cfg->chrootdir)) != 0)
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fatal_exit("config file %s is not inside chroot %s",
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buf, cfg->chrootdir);
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}
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if(cfg->directory && cfg->directory[0]) {
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char* ad = fname_after_chroot(cfg->directory, cfg, 0);
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if(!ad) fatal_exit("out of memory");
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if(!is_dir(ad)) fatal_exit("bad chdir directory");
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free(ad);
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}
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if( (cfg->chrootdir && cfg->chrootdir[0]) ||
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(cfg->directory && cfg->directory[0])) {
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if(cfg->pidfile && cfg->pidfile[0]) {
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char* ad = (cfg->pidfile[0]=='/')?strdup(cfg->pidfile):
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fname_after_chroot(cfg->pidfile, cfg, 1);
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char* bd = basedir(ad);
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if(bd && !is_dir(bd))
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fatal_exit("pidfile directory does not exist");
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free(ad);
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}
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if(cfg->logfile && cfg->logfile[0]) {
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char* ad = fname_after_chroot(cfg->logfile, cfg, 1);
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char* bd = basedir(ad);
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if(bd && !is_dir(bd))
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fatal_exit("logfile directory does not exist");
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free(ad);
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}
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}
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check_chroot_filelist("file with root-hints",
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cfg->root_hints, cfg->chrootdir, cfg);
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check_chroot_filelist("trust-anchor-file",
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cfg->trust_anchor_file_list, cfg->chrootdir, cfg);
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check_chroot_filelist("auto-trust-anchor-file",
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cfg->auto_trust_anchor_file_list, cfg->chrootdir, cfg);
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check_chroot_filelist_wild("trusted-keys-file",
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cfg->trusted_keys_file_list, cfg->chrootdir, cfg);
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check_chroot_string("dlv-anchor-file", &cfg->dlv_anchor_file,
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cfg->chrootdir, cfg);
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/* remove chroot setting so that modules are not stripping pathnames*/
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free(cfg->chrootdir);
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cfg->chrootdir = NULL;
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if(strcmp(cfg->module_conf, "iterator") != 0
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&& strcmp(cfg->module_conf, "validator iterator") != 0
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&& strcmp(cfg->module_conf, "dns64 validator iterator") != 0
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&& strcmp(cfg->module_conf, "dns64 iterator") != 0
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#ifdef WITH_PYTHONMODULE
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&& strcmp(cfg->module_conf, "python iterator") != 0
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&& strcmp(cfg->module_conf, "python validator iterator") != 0
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&& strcmp(cfg->module_conf, "validator python iterator") != 0
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&& strcmp(cfg->module_conf, "dns64 python iterator") != 0
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&& strcmp(cfg->module_conf, "dns64 python validator iterator") != 0
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&& strcmp(cfg->module_conf, "dns64 validator python iterator") != 0
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&& strcmp(cfg->module_conf, "python dns64 iterator") != 0
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&& strcmp(cfg->module_conf, "python dns64 validator iterator") != 0
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#endif
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) {
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fatal_exit("module conf '%s' is not known to work",
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cfg->module_conf);
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}
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#ifdef HAVE_GETPWNAM
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if(cfg->username && cfg->username[0]) {
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if(getpwnam(cfg->username) == NULL)
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fatal_exit("user '%s' does not exist.", cfg->username);
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endpwent();
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}
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#endif
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if(cfg->remote_control_enable && cfg->remote_control_use_cert) {
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check_chroot_string("server-key-file", &cfg->server_key_file,
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cfg->chrootdir, cfg);
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check_chroot_string("server-cert-file", &cfg->server_cert_file,
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cfg->chrootdir, cfg);
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if(!is_file(cfg->control_key_file))
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fatal_exit("control-key-file: \"%s\" does not exist",
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cfg->control_key_file);
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if(!is_file(cfg->control_cert_file))
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fatal_exit("control-cert-file: \"%s\" does not exist",
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cfg->control_cert_file);
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}
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localzonechecks(cfg);
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}
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/** check forwards */
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static void
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check_fwd(struct config_file* cfg)
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{
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struct iter_forwards* fwd = forwards_create();
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if(!fwd || !forwards_apply_cfg(fwd, cfg)) {
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fatal_exit("Could not set forward zones");
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}
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forwards_delete(fwd);
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}
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/** check hints */
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static void
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check_hints(struct config_file* cfg)
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{
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struct iter_hints* hints = hints_create();
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if(!hints || !hints_apply_cfg(hints, cfg)) {
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fatal_exit("Could not set root or stub hints");
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}
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hints_delete(hints);
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}
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/** check config file */
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static void
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checkconf(const char* cfgfile, const char* opt, int final)
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{
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struct config_file* cfg = config_create();
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if(!cfg)
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fatal_exit("out of memory");
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if(!config_read(cfg, cfgfile, NULL)) {
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/* config_read prints messages to stderr */
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config_delete(cfg);
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exit(1);
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}
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if(opt) {
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print_option(cfg, opt, final);
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config_delete(cfg);
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return;
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}
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morechecks(cfg, cfgfile);
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check_mod(cfg, iter_get_funcblock());
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check_mod(cfg, val_get_funcblock());
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|
#ifdef WITH_PYTHONMODULE
|
|
if(strstr(cfg->module_conf, "python"))
|
|
check_mod(cfg, pythonmod_get_funcblock());
|
|
#endif
|
|
check_fwd(cfg);
|
|
check_hints(cfg);
|
|
printf("unbound-checkconf: no errors in %s\n", cfgfile);
|
|
config_delete(cfg);
|
|
}
|
|
|
|
/** 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 checkconf */
|
|
int main(int argc, char* argv[])
|
|
{
|
|
int c;
|
|
int final = 0;
|
|
const char* f;
|
|
const char* opt = NULL;
|
|
const char* cfgfile = CONFIGFILE;
|
|
log_ident_set("unbound-checkconf");
|
|
log_init(NULL, 0, NULL);
|
|
checklock_start();
|
|
#ifdef USE_WINSOCK
|
|
/* use registry config file in preference to compiletime location */
|
|
if(!(cfgfile=w_lookup_reg_str("Software\\Unbound", "ConfigFile")))
|
|
cfgfile = CONFIGFILE;
|
|
#endif /* USE_WINSOCK */
|
|
/* parse the options */
|
|
while( (c=getopt(argc, argv, "fho:")) != -1) {
|
|
switch(c) {
|
|
case 'f':
|
|
final = 1;
|
|
break;
|
|
case 'o':
|
|
opt = optarg;
|
|
break;
|
|
case '?':
|
|
case 'h':
|
|
default:
|
|
usage();
|
|
}
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
if(argc != 0 && argc != 1)
|
|
usage();
|
|
if(argc == 1)
|
|
f = argv[0];
|
|
else f = cfgfile;
|
|
checkconf(f, opt, final);
|
|
checklock_stop();
|
|
return 0;
|
|
}
|