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monero/external/unbound/smallapp/unbound-checkconf.c

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/*
* checkconf/unbound-checkconf.c - config file checker for unbound.conf file.
*
* Copyright (c) 2007, NLnet Labs. All rights reserved.
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the NLNET LABS nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
*
* The config checker checks for syntax and other errors in the unbound.conf
* file, and can be used to check for errors before the server is started
* or sigHUPped.
* Exit status 1 means an error.
*/
#include "config.h"
#include "util/log.h"
#include "util/config_file.h"
#include "util/module.h"
#include "util/net_help.h"
#include "util/regional.h"
#include "iterator/iterator.h"
#include "iterator/iter_fwd.h"
#include "iterator/iter_hints.h"
#include "validator/validator.h"
#include "services/localzone.h"
#include "ldns/sbuffer.h"
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_GLOB_H
#include <glob.h>
#endif
#ifdef WITH_PYTHONMODULE
#include "pythonmod/pythonmod.h"
#endif
/** Give checkconf usage, and exit (1). */
static void
usage()
{
printf("Usage: unbound-checkconf [file]\n");
printf(" Checks unbound configuration file for errors.\n");
printf("file if omitted %s is used.\n", CONFIGFILE);
printf("-o option print value of option to stdout.\n");
printf("-h show this usage help.\n");
printf("Version %s\n", PACKAGE_VERSION);
printf("BSD licensed, see LICENSE in source package for details.\n");
printf("Report bugs to %s\n", PACKAGE_BUGREPORT);
exit(1);
}
/**
* Print given option to stdout
* @param cfg: config
* @param opt: option name without trailing :.
* This is different from config_set_option.
*/
static void
print_option(struct config_file* cfg, const char* opt)
{
if(!config_get_option(cfg, opt, config_print_func, stdout))
fatal_exit("cannot print option '%s'", opt);
}
/** check if module works with config */
static void
check_mod(struct config_file* cfg, struct module_func_block* fb)
{
struct module_env env;
memset(&env, 0, sizeof(env));
env.cfg = cfg;
env.scratch = regional_create();
env.scratch_buffer = sldns_buffer_new(BUFSIZ);
if(!env.scratch || !env.scratch_buffer)
fatal_exit("out of memory");
if(!(*fb->init)(&env, 0)) {
fatal_exit("bad config for %s module", fb->name);
}
(*fb->deinit)(&env, 0);
sldns_buffer_free(env.scratch_buffer);
regional_destroy(env.scratch);
}
/** check localzones */
static void
localzonechecks(struct config_file* cfg)
{
struct local_zones* zs;
if(!(zs = local_zones_create()))
fatal_exit("out of memory");
if(!local_zones_apply_cfg(zs, cfg))
fatal_exit("failed local-zone, local-data configuration");
local_zones_delete(zs);
}
/** emit warnings for IP in hosts */
static void
warn_hosts(const char* typ, struct config_stub* list)
{
struct sockaddr_storage a;
socklen_t alen;
struct config_stub* s;
struct config_strlist* h;
for(s=list; s; s=s->next) {
for(h=s->hosts; h; h=h->next) {
if(extstrtoaddr(h->str, &a, &alen)) {
fprintf(stderr, "unbound-checkconf: warning:"
" %s %s: \"%s\" is an IP%s address, "
"and when looked up as a host name "
"during use may not resolve.\n",
s->name, typ, h->str,
addr_is_ip6(&a, alen)?"6":"4");
}
}
}
}
/** check interface strings */
static void
interfacechecks(struct config_file* cfg)
{
struct sockaddr_storage a;
socklen_t alen;
int i, j;
for(i=0; i<cfg->num_ifs; i++) {
if(!extstrtoaddr(cfg->ifs[i], &a, &alen)) {
fatal_exit("cannot parse interface specified as '%s'",
cfg->ifs[i]);
}
for(j=0; j<cfg->num_ifs; j++) {
if(i!=j && strcmp(cfg->ifs[i], cfg->ifs[j])==0)
fatal_exit("interface: %s present twice, "
"cannot bind same ports twice.",
cfg->ifs[i]);
}
}
for(i=0; i<cfg->num_out_ifs; i++) {
if(!ipstrtoaddr(cfg->out_ifs[i], UNBOUND_DNS_PORT,
&a, &alen)) {
fatal_exit("cannot parse outgoing-interface "
"specified as '%s'", cfg->out_ifs[i]);
}
for(j=0; j<cfg->num_out_ifs; j++) {
if(i!=j && strcmp(cfg->out_ifs[i], cfg->out_ifs[j])==0)
fatal_exit("outgoing-interface: %s present "
"twice, cannot bind same ports twice.",
cfg->out_ifs[i]);
}
}
}
/** check acl ips */
static void
aclchecks(struct config_file* cfg)
{
int d;
struct sockaddr_storage a;
socklen_t alen;
struct config_str2list* acl;
for(acl=cfg->acls; acl; acl = acl->next) {
if(!netblockstrtoaddr(acl->str, UNBOUND_DNS_PORT, &a, &alen,
&d)) {
fatal_exit("cannot parse access control address %s %s",
acl->str, acl->str2);
}
}
}
/** true if fname is a file */
static int
is_file(const char* fname)
{
struct stat buf;
if(stat(fname, &buf) < 0) {
if(errno==EACCES) {
printf("warning: no search permission for one of the directories in path: %s\n", fname);
return 1;
}
perror(fname);
return 0;
}
if(S_ISDIR(buf.st_mode)) {
printf("%s is not a file\n", fname);
return 0;
}
return 1;
}
/** true if fname is a directory */
static int
is_dir(const char* fname)
{
struct stat buf;
if(stat(fname, &buf) < 0) {
if(errno==EACCES) {
printf("warning: no search permission for one of the directories in path: %s\n", fname);
return 1;
}
perror(fname);
return 0;
}
if(!(S_ISDIR(buf.st_mode))) {
printf("%s is not a directory\n", fname);
return 0;
}
return 1;
}
/** get base dir of a fname */
static char*
basedir(char* fname)
{
char* rev;
if(!fname) fatal_exit("out of memory");
rev = strrchr(fname, '/');
if(!rev) return NULL;
if(fname == rev) return NULL;
rev[0] = 0;
return fname;
}
/** check chroot for a file string */
static void
check_chroot_string(const char* desc, char** ss,
const char* chrootdir, struct config_file* cfg)
{
char* str = *ss;
if(str && str[0]) {
*ss = fname_after_chroot(str, cfg, 1);
if(!*ss) fatal_exit("out of memory");
if(!is_file(*ss)) {
if(chrootdir && chrootdir[0])
fatal_exit("%s: \"%s\" does not exist in "
"chrootdir %s", desc, str, chrootdir);
else
fatal_exit("%s: \"%s\" does not exist",
desc, str);
}
/* put in a new full path for continued checking */
free(str);
}
}
/** check file list, every file must be inside the chroot location */
static void
check_chroot_filelist(const char* desc, struct config_strlist* list,
const char* chrootdir, struct config_file* cfg)
{
struct config_strlist* p;
for(p=list; p; p=p->next) {
check_chroot_string(desc, &p->str, chrootdir, cfg);
}
}
/** check file list, with wildcard processing */
static void
check_chroot_filelist_wild(const char* desc, struct config_strlist* list,
const char* chrootdir, struct config_file* cfg)
{
struct config_strlist* p;
for(p=list; p; p=p->next) {
#ifdef HAVE_GLOB
if(strchr(p->str, '*') || strchr(p->str, '[') ||
strchr(p->str, '?') || strchr(p->str, '{') ||
strchr(p->str, '~')) {
char* s = p->str;
/* adjust whole pattern for chroot and check later */
p->str = fname_after_chroot(p->str, cfg, 1);
free(s);
} else
#endif /* HAVE_GLOB */
check_chroot_string(desc, &p->str, chrootdir, cfg);
}
}
/** check configuration for errors */
static void
morechecks(struct config_file* cfg, const char* fname)
{
warn_hosts("stub-host", cfg->stubs);
warn_hosts("forward-host", cfg->forwards);
interfacechecks(cfg);
aclchecks(cfg);
if(cfg->verbosity < 0)
fatal_exit("verbosity value < 0");
if(cfg->num_threads <= 0 || cfg->num_threads > 10000)
fatal_exit("num_threads value weird");
if(!cfg->do_ip4 && !cfg->do_ip6)
fatal_exit("ip4 and ip6 are both disabled, pointless");
if(!cfg->do_udp && !cfg->do_tcp)
fatal_exit("udp and tcp are both disabled, pointless");
if(cfg->edns_buffer_size > cfg->msg_buffer_size)
fatal_exit("edns-buffer-size larger than msg-buffer-size, "
"answers will not fit in processing buffer");
if(cfg->chrootdir && cfg->chrootdir[0] &&
cfg->chrootdir[strlen(cfg->chrootdir)-1] == '/')
fatal_exit("chootdir %s has trailing slash '/' please remove.",
cfg->chrootdir);
if(cfg->chrootdir && cfg->chrootdir[0] &&
!is_dir(cfg->chrootdir)) {
fatal_exit("bad chroot directory");
}
if(cfg->chrootdir && cfg->chrootdir[0]) {
char buf[10240];
buf[0] = 0;
if(fname[0] != '/') {
if(getcwd(buf, sizeof(buf)) == NULL)
fatal_exit("getcwd: %s", strerror(errno));
(void)strlcat(buf, "/", sizeof(buf));
}
(void)strlcat(buf, fname, sizeof(buf));
if(strncmp(buf, cfg->chrootdir, strlen(cfg->chrootdir)) != 0)
fatal_exit("config file %s is not inside chroot %s",
buf, cfg->chrootdir);
}
if(cfg->directory && cfg->directory[0]) {
char* ad = fname_after_chroot(cfg->directory, cfg, 0);
if(!ad) fatal_exit("out of memory");
if(!is_dir(ad)) fatal_exit("bad chdir directory");
free(ad);
}
if( (cfg->chrootdir && cfg->chrootdir[0]) ||
(cfg->directory && cfg->directory[0])) {
if(cfg->pidfile && cfg->pidfile[0]) {
char* ad = (cfg->pidfile[0]=='/')?strdup(cfg->pidfile):
fname_after_chroot(cfg->pidfile, cfg, 1);
char* bd = basedir(ad);
if(bd && !is_dir(bd))
fatal_exit("pidfile directory does not exist");
free(ad);
}
if(cfg->logfile && cfg->logfile[0]) {
char* ad = fname_after_chroot(cfg->logfile, cfg, 1);
char* bd = basedir(ad);
if(bd && !is_dir(bd))
fatal_exit("logfile directory does not exist");
free(ad);
}
}
check_chroot_filelist("file with root-hints",
cfg->root_hints, cfg->chrootdir, cfg);
check_chroot_filelist("trust-anchor-file",
cfg->trust_anchor_file_list, cfg->chrootdir, cfg);
check_chroot_filelist("auto-trust-anchor-file",
cfg->auto_trust_anchor_file_list, cfg->chrootdir, cfg);
check_chroot_filelist_wild("trusted-keys-file",
cfg->trusted_keys_file_list, cfg->chrootdir, cfg);
check_chroot_string("dlv-anchor-file", &cfg->dlv_anchor_file,
cfg->chrootdir, cfg);
/* remove chroot setting so that modules are not stripping pathnames*/
free(cfg->chrootdir);
cfg->chrootdir = NULL;
if(strcmp(cfg->module_conf, "iterator") != 0
&& strcmp(cfg->module_conf, "validator iterator") != 0
#ifdef WITH_PYTHONMODULE
&& strcmp(cfg->module_conf, "python iterator") != 0
&& strcmp(cfg->module_conf, "python validator iterator") != 0
&& strcmp(cfg->module_conf, "validator python iterator") != 0
#endif
) {
fatal_exit("module conf '%s' is not known to work",
cfg->module_conf);
}
#ifdef HAVE_GETPWNAM
if(cfg->username && cfg->username[0]) {
if(getpwnam(cfg->username) == NULL)
fatal_exit("user '%s' does not exist.", cfg->username);
endpwent();
}
#endif
if(cfg->remote_control_enable) {
check_chroot_string("server-key-file", &cfg->server_key_file,
cfg->chrootdir, cfg);
check_chroot_string("server-cert-file", &cfg->server_cert_file,
cfg->chrootdir, cfg);
if(!is_file(cfg->control_key_file))
fatal_exit("control-key-file: \"%s\" does not exist",
cfg->control_key_file);
if(!is_file(cfg->control_cert_file))
fatal_exit("control-cert-file: \"%s\" does not exist",
cfg->control_cert_file);
}
localzonechecks(cfg);
}
/** check forwards */
static void
check_fwd(struct config_file* cfg)
{
struct iter_forwards* fwd = forwards_create();
if(!fwd || !forwards_apply_cfg(fwd, cfg)) {
fatal_exit("Could not set forward zones");
}
forwards_delete(fwd);
}
/** check hints */
static void
check_hints(struct config_file* cfg)
{
struct iter_hints* hints = hints_create();
if(!hints || !hints_apply_cfg(hints, cfg)) {
fatal_exit("Could not set root or stub hints");
}
hints_delete(hints);
}
/** check config file */
static void
checkconf(const char* cfgfile, const char* opt)
{
struct config_file* cfg = config_create();
if(!cfg)
fatal_exit("out of memory");
if(!config_read(cfg, cfgfile, NULL)) {
/* config_read prints messages to stderr */
config_delete(cfg);
exit(1);
}
if(opt) {
print_option(cfg, opt);
config_delete(cfg);
return;
}
morechecks(cfg, cfgfile);
check_mod(cfg, iter_get_funcblock());
check_mod(cfg, val_get_funcblock());
#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;
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, "ho:")) != -1) {
switch(c) {
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);
checklock_stop();
return 0;
}
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