/*
* daemon/unbound.c - main program for unbound DNS resolver daemon.
*
* 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
*
* Main program to start the DNS resolver daemon.
*/
#include "config.h"
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#include <sys/time.h>
#include "util/log.h"
#include "daemon/daemon.h"
#include "daemon/remote.h"
#include "util/config_file.h"
#include "util/storage/slabhash.h"
#include "services/listen_dnsport.h"
#include "services/cache/rrset.h"
#include "services/cache/infra.h"
#include "util/fptr_wlist.h"
#include "util/data/msgreply.h"
#include "util/module.h"
#include "util/net_help.h"
#include "util/ub_event.h"
#include <signal.h>
#include <fcntl.h>
#include <openssl/crypto.h>
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#ifdef HAVE_GRP_H
#include <grp.h>
#endif
#include <openssl/ssl.h>
#ifndef S_SPLINT_S
/* splint chokes on this system header file */
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
#endif /* S_SPLINT_S */
#ifdef HAVE_LOGIN_CAP_H
#include <login_cap.h>
#endif
#ifdef UB_ON_WINDOWS
# include "winrc/win_svc.h"
#endif
#ifdef HAVE_NSS
/* nss3 */
# include "nss.h"
#endif
#ifdef HAVE_TARGETCONDITIONALS_H
#include <TargetConditionals.h>
#endif
#if (defined(TARGET_OS_TV) && TARGET_OS_TV) || (defined(TARGET_OS_WATCH) && TARGET_OS_WATCH)
#undef HAVE_FORK
#endif
/** print build options. */
static void
print_build_options(void)
{
const char** m;
const char *evnm="event", *evsys="", *evmethod="";
time_t t;
struct timeval now;
struct ub_event_base* base;
printf("Version %s\n\n", PACKAGE_VERSION);
printf("Configure line: %s\n", CONFCMDLINE);
base = ub_default_event_base(0,&t,&now);
ub_get_event_sys(base, &evnm, &evsys, &evmethod);
printf("Linked libs: %s %s (it uses %s), %s\n",
evnm, evsys, evmethod,
#ifdef HAVE_SSL
# ifdef SSLEAY_VERSION
SSLeay_version(SSLEAY_VERSION)
# else
OpenSSL_version(OPENSSL_VERSION)
# endif
#elif defined(HAVE_NSS)
NSS_GetVersion()
#elif defined(HAVE_NETTLE)
"nettle"
#endif
);
printf("Linked modules:");
for(m = module_list_avail(); *m; m++)
printf(" %s", *m);
printf("\n");
#ifdef USE_DNSCRYPT
printf("DNSCrypt feature available\n");
#endif
#ifdef USE_TCP_FASTOPEN
printf("TCP Fastopen feature available\n");
#endif
ub_event_base_free(base);
printf("\nBSD licensed, see LICENSE in source package for details.\n");
printf("Report bugs to %s\n", PACKAGE_BUGREPORT);
}
/** print usage. */
static void
usage(void)
{
printf("usage: unbound [options]\n");
printf(" start unbound daemon DNS resolver.\n");
printf("-h this help.\n");
printf("-c file config file to read instead of %s\n", CONFIGFILE);
printf(" file format is described in unbound.conf(5).\n");
printf("-d do not fork into the background.\n");
printf("-p do not create a pidfile.\n");
printf("-v verbose (more times to increase verbosity).\n");
printf("-V show version number and build options.\n");
#ifdef UB_ON_WINDOWS
printf("-w opt windows option: \n");
printf(" install, remove - manage the services entry\n");
printf(" service - used to start from services control panel\n");
#endif
printf("\nVersion %s\n", PACKAGE_VERSION);
printf("BSD licensed, see LICENSE in source package for details.\n");
printf("Report bugs to %s\n", PACKAGE_BUGREPORT);
}
#ifndef unbound_testbound
int replay_var_compare(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b))
{
log_assert(0);
return 0;
}
#endif
/** check file descriptor count */
static void
checkrlimits(struct config_file* cfg)
{
#ifndef S_SPLINT_S
#ifdef HAVE_GETRLIMIT
/* list has number of ports to listen to, ifs number addresses */
int list = ((cfg->do_udp?1:0) + (cfg->do_tcp?1 +
(int)cfg->incoming_num_tcp:0));
size_t listen_ifs = (size_t)(cfg->num_ifs==0?
((cfg->do_ip4 && !cfg->if_automatic?1:0) +
(cfg->do_ip6?1:0)):cfg->num_ifs);
size_t listen_num = list*listen_ifs;
size_t outudpnum = (size_t)cfg->outgoing_num_ports;
size_t outtcpnum = cfg->outgoing_num_tcp;
size_t misc = 4; /* logfile, pidfile, stdout... */
size_t perthread_noudp = listen_num + outtcpnum +
2/*cmdpipe*/ + 2/*libevent*/ + misc;
size_t perthread = perthread_noudp + outudpnum;
#if !defined(HAVE_PTHREAD) && !defined(HAVE_SOLARIS_THREADS)
int numthread = 1; /* it forks */
#else
int numthread = (cfg->num_threads?cfg->num_threads:1);
#endif
size_t total = numthread * perthread + misc;
size_t avail;
struct rlimit rlim;
size_t memsize_expect = cfg->msg_cache_size + cfg->rrset_cache_size
+ (cfg->do_tcp?cfg->stream_wait_size:0)
+ (cfg->ip_ratelimit?cfg->ip_ratelimit_size:0)
+ (cfg->ratelimit?cfg->ratelimit_size:0)
+ (cfg->dnscrypt?cfg->dnscrypt_shared_secret_cache_size + cfg->dnscrypt_nonce_cache_size:0)
+ cfg->infra_cache_numhosts * (sizeof(struct infra_key)+sizeof(struct infra_data));
if(strstr(cfg->module_conf, "validator") && (cfg->trust_anchor_file_list || cfg->trust_anchor_list || cfg->auto_trust_anchor_file_list || cfg->trusted_keys_file_list)) {
memsize_expect += cfg->key_cache_size + cfg->neg_cache_size;
}
#ifdef HAVE_NGHTTP2_NGHTTP2_H
if(cfg_has_https(cfg)) {
memsize_expect += cfg->http_query_buffer_size + cfg->http_response_buffer_size;
}
#endif
#ifdef RLIMIT_AS
if(getrlimit(RLIMIT_AS, &rlim) == 0) {
if(rlim.rlim_cur != (rlim_t)RLIM_INFINITY &&
rlim.rlim_cur < (rlim_t)memsize_expect) {
log_warn("the ulimit(max memory size) is smaller than the expected memory usage (added size of caches). %u < %u bytes", (unsigned)rlim.rlim_cur, (unsigned)memsize_expect);
}
}
#endif
if(getrlimit(RLIMIT_DATA, &rlim) == 0) {
if(rlim.rlim_cur != (rlim_t)RLIM_INFINITY &&
rlim.rlim_cur < (rlim_t)memsize_expect) {
log_warn("the ulimit(data seg size) is smaller than the expected memory usage (added size of caches). %u < %u bytes", (unsigned)rlim.rlim_cur, (unsigned)memsize_expect);
}
}
if(total > 1024 &&
strncmp(ub_event_get_version(), "mini-event", 10) == 0) {
log_warn("too many file descriptors requested. The builtin"
"mini-event cannot handle more than 1024. Config "
"for less fds or compile with libevent");
if(numthread*perthread_noudp+15 > 1024)
fatal_exit("too much tcp. not enough fds.");
cfg->outgoing_num_ports = (int)((1024
- numthread*perthread_noudp
- 10 /* safety margin */) /numthread);
log_warn("continuing with less udp ports: %u",
cfg->outgoing_num_ports);
total = 1024;
}
if(perthread > 64 &&
strncmp(ub_event_get_version(), "winsock-event", 13) == 0) {
log_err("too many file descriptors requested. The winsock"
" event handler cannot handle more than 64 per "
" thread. Config for less fds");
if(perthread_noudp+2 > 64)
fatal_exit("too much tcp. not enough fds.");
cfg->outgoing_num_ports = (int)((64
- perthread_noudp
- 2/* safety margin */));
log_warn("continuing with less udp ports: %u",
cfg->outgoing_num_ports);
total = numthread*(perthread_noudp+
(size_t)cfg->outgoing_num_ports)+misc;
}
if(getrlimit(RLIMIT_NOFILE, &rlim) < 0) {
log_warn("getrlimit: %s", strerror(errno));
return;
}
if(rlim.rlim_cur == (rlim_t)RLIM_INFINITY)
return;
if((size_t)rlim.rlim_cur < total) {
avail = (size_t)rlim.rlim_cur;
rlim.rlim_cur = (rlim_t)(total + 10);
rlim.rlim_max = (rlim_t)(total + 10);
#ifdef HAVE_SETRLIMIT
if(setrlimit(RLIMIT_NOFILE, &rlim) < 0) {
log_warn("setrlimit: %s", strerror(errno));
#endif
log_warn("cannot increase max open fds from %u to %u",
(unsigned)avail, (unsigned)total+10);
/* check that calculation below does not underflow,
* with 15 as margin */
if(numthread*perthread_noudp+15 > avail)
fatal_exit("too much tcp. not enough fds.");
cfg->outgoing_num_ports = (int)((avail
- numthread*perthread_noudp
- 10 /* safety margin */) /numthread);
log_warn("continuing with less udp ports: %u",
cfg->outgoing_num_ports);
log_warn("increase ulimit or decrease threads, "
"ports in config to remove this warning");
return;
#ifdef HAVE_SETRLIMIT
}
#endif
verbose(VERB_ALGO, "increased limit(open files) from %u to %u",
(unsigned)avail, (unsigned)total+10);
}
#else
(void)cfg;
#endif /* HAVE_GETRLIMIT */
#endif /* S_SPLINT_S */
}
/** set verbosity, check rlimits, cache settings */
static void
apply_settings(struct daemon* daemon, struct config_file* cfg,
int cmdline_verbose, int debug_mode)
{
/* apply if they have changed */
verbosity = cmdline_verbose + cfg->verbosity;
if (debug_mode > 1) {
cfg->use_syslog = 0;
free(cfg->logfile);
cfg->logfile = NULL;
}
daemon_apply_cfg(daemon, cfg);
checkrlimits(cfg);
if (cfg->use_systemd && cfg->do_daemonize) {
log_warn("use-systemd and do-daemonize should not be enabled at the same time");
}
log_ident_set_or_default(cfg->log_identity);
}
#ifdef HAVE_KILL
/** Read existing pid from pidfile.
* @param file: file name of pid file.
* @return: the pid from the file or -1 if none.
*/
static pid_t
readpid (const char* file)
{
int fd;
pid_t pid;
char pidbuf[32];
char* t;
ssize_t l;
if ((fd = open(file, O_RDONLY)) == -1) {
if(errno != ENOENT)
log_err("Could not read pidfile %s: %s",
file, strerror(errno));
return -1;
}
if (((l = read(fd, pidbuf, sizeof(pidbuf)))) == -1) {
if(errno != ENOENT)
log_err("Could not read pidfile %s: %s",
file, strerror(errno));
close(fd);
return -1;
}
close(fd);
/* Empty pidfile means no pidfile... */
if (l == 0) {
return -1;
}
pidbuf[sizeof(pidbuf)-1] = 0;
pid = (pid_t)strtol(pidbuf, &t, 10);
if (*t && *t != '\n') {
return -1;
}
return pid;
}
/** write pid to file.
* @param pidfile: file name of pid file.
* @param pid: pid to write to file.
* @return false on failure
*/
static int
writepid (const char* pidfile, pid_t pid)
{
int fd;
char pidbuf[32];
size_t count = 0;
snprintf(pidbuf, sizeof(pidbuf), "%lu\n", (unsigned long)pid);
if((fd = open(pidfile, O_WRONLY | O_CREAT | O_TRUNC
#ifdef O_NOFOLLOW
| O_NOFOLLOW
#endif
, 0644)) == -1) {
log_err("cannot open pidfile %s: %s",
pidfile, strerror(errno));
return 0;
}
while(count < strlen(pidbuf)) {
ssize_t r = write(fd, pidbuf+count, strlen(pidbuf)-count);
if(r == -1) {
if(errno == EAGAIN || errno == EINTR)
continue;
log_err("cannot write to pidfile %s: %s",
pidfile, strerror(errno));
close(fd);
return 0;
} else if(r == 0) {
log_err("cannot write any bytes to pidfile %s: "
"write returns 0 bytes written", pidfile);
close(fd);
return 0;
}
count += r;
}
close(fd);
return 1;
}
/**
* check old pid file.
* @param pidfile: the file name of the pid file.
* @param inchroot: if pidfile is inchroot and we can thus expect to
* be able to delete it.
*/
static void
checkoldpid(char* pidfile, int inchroot)
{
pid_t old;
if((old = readpid(pidfile)) != -1) {
/* see if it is still alive */
if(kill(old, 0) == 0 || errno == EPERM)
log_warn("unbound is already running as pid %u.",
(unsigned)old);
else if(inchroot)
log_warn("did not exit gracefully last time (%u)",
(unsigned)old);
}
}
#endif /* HAVE_KILL */
/** detach from command line */
static void
detach(void)
{
#if defined(HAVE_DAEMON) && !defined(DEPRECATED_DAEMON)
/* use POSIX daemon(3) function */
if(daemon(1, 0) != 0)
fatal_exit("daemon failed: %s", strerror(errno));
#else /* no HAVE_DAEMON */
#ifdef HAVE_FORK
int fd;
/* Take off... */
switch (fork()) {
case 0:
break;
case -1:
fatal_exit("fork failed: %s", strerror(errno));
default:
/* exit interactive session */
exit(0);
}
/* detach */
#ifdef HAVE_SETSID
if(setsid() == -1)
fatal_exit("setsid() failed: %s", strerror(errno));
#endif
if ((fd = open("/dev/null", O_RDWR, 0)) != -1) {
(void)dup2(fd, STDIN_FILENO);
(void)dup2(fd, STDOUT_FILENO);
(void)dup2(fd, STDERR_FILENO);
if (fd > 2)
(void)close(fd);
}
#endif /* HAVE_FORK */
#endif /* HAVE_DAEMON */
}
/** daemonize, drop user privileges and chroot if needed */
static void
perform_setup(struct daemon* daemon, struct config_file* cfg, int debug_mode,
const char** cfgfile, int need_pidfile)
{
#ifdef HAVE_KILL
int pidinchroot;
#endif
#ifdef HAVE_GETPWNAM
struct passwd *pwd = NULL;
if(cfg->username && cfg->username[0]) {
if((pwd = getpwnam(cfg->username)) == NULL)
fatal_exit("user '%s' does not exist.", cfg->username);
/* endpwent below, in case we need pwd for setusercontext */
}
#endif
#ifdef UB_ON_WINDOWS
w_config_adjust_directory(cfg);
#endif
/* read ssl keys while superuser and outside chroot */
#ifdef HAVE_SSL
if(!(daemon->rc = daemon_remote_create(cfg)))
fatal_exit("could not set up remote-control");
if(cfg->ssl_service_key && cfg->ssl_service_key[0]) {
if(!(daemon->listen_sslctx = listen_sslctx_create(
cfg->ssl_service_key, cfg->ssl_service_pem, NULL)))
fatal_exit("could not set up listen SSL_CTX");
if(cfg->tls_ciphers && cfg->tls_ciphers[0]) {
if (!SSL_CTX_set_cipher_list(daemon->listen_sslctx, cfg->tls_ciphers)) {
fatal_exit("failed to set tls-cipher %s", cfg->tls_ciphers);
}
}
#ifdef HAVE_SSL_CTX_SET_CIPHERSUITES
if(cfg->tls_ciphersuites && cfg->tls_ciphersuites[0]) {
if (!SSL_CTX_set_ciphersuites(daemon->listen_sslctx, cfg->tls_ciphersuites)) {
fatal_exit("failed to set tls-ciphersuites %s", cfg->tls_ciphersuites);
}
}
#endif
if(cfg->tls_session_ticket_keys.first &&
cfg->tls_session_ticket_keys.first->str[0] != 0) {
if(!listen_sslctx_setup_ticket_keys(daemon->listen_sslctx, cfg->tls_session_ticket_keys.first)) {
fatal_exit("could not set session ticket SSL_CTX");
}
}
}
if(!(daemon->connect_sslctx = connect_sslctx_create(NULL, NULL,
cfg->tls_cert_bundle, cfg->tls_win_cert)))
fatal_exit("could not set up connect SSL_CTX");
#endif
/* init syslog (as root) if needed, before daemonize, otherwise
* a fork error could not be printed since daemonize closed stderr.*/
if(cfg->use_syslog) {
log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir);
}
/* if using a logfile, we cannot open it because the logfile would
* be created with the wrong permissions, we cannot chown it because
* we cannot chown system logfiles, so we do not open at all.
* So, using a logfile, the user does not see errors unless -d is
* given to unbound on the commandline. */
#ifdef HAVE_KILL
/* true if pidfile is inside chrootdir, or nochroot */
pidinchroot = need_pidfile && (!(cfg->chrootdir && cfg->chrootdir[0]) ||
(cfg->chrootdir && cfg->chrootdir[0] &&
strncmp(cfg->pidfile, cfg->chrootdir,
strlen(cfg->chrootdir))==0));
/* check old pid file before forking */
if(cfg->pidfile && cfg->pidfile[0] && need_pidfile) {
/* calculate position of pidfile */
if(cfg->pidfile[0] == '/')
daemon->pidfile = strdup(cfg->pidfile);
else daemon->pidfile = fname_after_chroot(cfg->pidfile,
cfg, 1);
if(!daemon->pidfile)
fatal_exit("pidfile alloc: out of memory");
checkoldpid(daemon->pidfile, pidinchroot);
}
#endif
/* daemonize because pid is needed by the writepid func */
if(!debug_mode && cfg->do_daemonize) {
detach();
}
/* write new pidfile (while still root, so can be outside chroot) */
#ifdef HAVE_KILL
if(cfg->pidfile && cfg->pidfile[0] && need_pidfile) {
if(writepid(daemon->pidfile, getpid())) {
if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1 &&
pidinchroot) {
# ifdef HAVE_CHOWN
if(chown(daemon->pidfile, cfg_uid, cfg_gid) == -1) {
verbose(VERB_QUERY, "cannot chown %u.%u %s: %s",
(unsigned)cfg_uid, (unsigned)cfg_gid,
daemon->pidfile, strerror(errno));
}
# endif /* HAVE_CHOWN */
}
}
}
#else
(void)daemon;
(void)need_pidfile;
#endif /* HAVE_KILL */
/* Set user context */
#ifdef HAVE_GETPWNAM
if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1) {
#ifdef HAVE_SETUSERCONTEXT
/* setusercontext does initgroups, setuid, setgid, and
* also resource limits from login config, but we
* still call setresuid, setresgid to be sure to set all uid*/
if(setusercontext(NULL, pwd, cfg_uid, (unsigned)
LOGIN_SETALL & ~LOGIN_SETUSER & ~LOGIN_SETGROUP) != 0)
log_warn("unable to setusercontext %s: %s",
cfg->username, strerror(errno));
#else
(void)pwd;
#endif /* HAVE_SETUSERCONTEXT */
}
#endif /* HAVE_GETPWNAM */
/* box into the chroot */
#ifdef HAVE_CHROOT
if(cfg->chrootdir && cfg->chrootdir[0]) {
if(chdir(cfg->chrootdir)) {
fatal_exit("unable to chdir to chroot %s: %s",
cfg->chrootdir, strerror(errno));
}
verbose(VERB_QUERY, "chdir to %s", cfg->chrootdir);
if(chroot(cfg->chrootdir))
fatal_exit("unable to chroot to %s: %s",
cfg->chrootdir, strerror(errno));
if(chdir("/"))
fatal_exit("unable to chdir to / in chroot %s: %s",
cfg->chrootdir, strerror(errno));
verbose(VERB_QUERY, "chroot to %s", cfg->chrootdir);
if(strncmp(*cfgfile, cfg->chrootdir,
strlen(cfg->chrootdir)) == 0)
(*cfgfile) += strlen(cfg->chrootdir);
/* adjust stored pidfile for chroot */
if(daemon->pidfile && daemon->pidfile[0] &&
strncmp(daemon->pidfile, cfg->chrootdir,
strlen(cfg->chrootdir))==0) {
char* old = daemon->pidfile;
daemon->pidfile = strdup(old+strlen(cfg->chrootdir));
free(old);
if(!daemon->pidfile)
log_err("out of memory in pidfile adjust");
}
daemon->chroot = strdup(cfg->chrootdir);
if(!daemon->chroot)
log_err("out of memory in daemon chroot dir storage");
}
#else
(void)cfgfile;
#endif
/* change to working directory inside chroot */
if(cfg->directory && cfg->directory[0]) {
char* dir = cfg->directory;
if(cfg->chrootdir && cfg->chrootdir[0] &&
strncmp(dir, cfg->chrootdir,
strlen(cfg->chrootdir)) == 0)
dir += strlen(cfg->chrootdir);
if(dir[0]) {
if(chdir(dir)) {
fatal_exit("Could not chdir to %s: %s",
dir, strerror(errno));
}
verbose(VERB_QUERY, "chdir to %s", dir);
}
}
/* drop permissions after chroot, getpwnam, pidfile, syslog done*/
#ifdef HAVE_GETPWNAM
if(cfg->username && cfg->username[0] && cfg_uid != (uid_t)-1) {
# ifdef HAVE_INITGROUPS
if(initgroups(cfg->username, cfg_gid) != 0)
log_warn("unable to initgroups %s: %s",
cfg->username, strerror(errno));
# endif /* HAVE_INITGROUPS */
# ifdef HAVE_ENDPWENT
endpwent();
# endif
#ifdef HAVE_SETRESGID
if(setresgid(cfg_gid,cfg_gid,cfg_gid) != 0)
#elif defined(HAVE_SETREGID) && !defined(DARWIN_BROKEN_SETREUID)
if(setregid(cfg_gid,cfg_gid) != 0)
#else /* use setgid */
if(setgid(cfg_gid) != 0)
#endif /* HAVE_SETRESGID */
fatal_exit("unable to set group id of %s: %s",
cfg->username, strerror(errno));
#ifdef HAVE_SETRESUID
if(setresuid(cfg_uid,cfg_uid,cfg_uid) != 0)
#elif defined(HAVE_SETREUID) && !defined(DARWIN_BROKEN_SETREUID)
if(setreuid(cfg_uid,cfg_uid) != 0)
#else /* use setuid */
if(setuid(cfg_uid) != 0)
#endif /* HAVE_SETRESUID */
fatal_exit("unable to set user id of %s: %s",
cfg->username, strerror(errno));
verbose(VERB_QUERY, "drop user privileges, run as %s",
cfg->username);
}
#endif /* HAVE_GETPWNAM */
/* file logging inited after chroot,chdir,setuid is done so that
* it would succeed on SIGHUP as well */
if(!cfg->use_syslog)
log_init(cfg->logfile, cfg->use_syslog, cfg->chrootdir);
}
/**
* Run the daemon.
* @param cfgfile: the config file name.
* @param cmdline_verbose: verbosity resulting from commandline -v.
* These increase verbosity as specified in the config file.
* @param debug_mode: if set, do not daemonize.
* @param need_pidfile: if false, no pidfile is checked or created.
*/
static void
run_daemon(const char* cfgfile, int cmdline_verbose, int debug_mode, int need_pidfile)
{
struct config_file* cfg = NULL;
struct daemon* daemon = NULL;
int done_setup = 0;
if(!(daemon = daemon_init()))
fatal_exit("alloc failure");
while(!daemon->need_to_exit) {
if(done_setup)
verbose(VERB_OPS, "Restart of %s.", PACKAGE_STRING);
else verbose(VERB_OPS, "Start of %s.", PACKAGE_STRING);
/* config stuff */
if(!(cfg = config_create()))
fatal_exit("Could not alloc config defaults");
if(!config_read(cfg, cfgfile, daemon->chroot)) {
if(errno != ENOENT)
fatal_exit("Could not read config file: %s."
" Maybe try unbound -dd, it stays on "
"the commandline to see more errors, "
"or unbound-checkconf", cfgfile);
log_warn("Continuing with default config settings");
}
apply_settings(daemon, cfg, cmdline_verbose, debug_mode);
if(!done_setup)
config_lookup_uid(cfg);
/* prepare */
if(!daemon_open_shared_ports(daemon))
fatal_exit("could not open ports");
if(!done_setup) {
perform_setup(daemon, cfg, debug_mode, &cfgfile, need_pidfile);
done_setup = 1;
} else {
/* reopen log after HUP to facilitate log rotation */
if(!cfg->use_syslog)
log_init(cfg->logfile, 0, cfg->chrootdir);
}
/* work */
daemon_fork(daemon);
/* clean up for restart */
verbose(VERB_ALGO, "cleanup.");
daemon_cleanup(daemon);
config_delete(cfg);
}
verbose(VERB_ALGO, "Exit cleanup.");
/* this unlink may not work if the pidfile is located outside
* of the chroot/workdir or we no longer have permissions */
if(daemon->pidfile) {
int fd;
/* truncate pidfile */
fd = open(daemon->pidfile, O_WRONLY | O_TRUNC, 0644);
if(fd != -1)
close(fd);
/* delete pidfile */
unlink(daemon->pidfile);
}
daemon_delete(daemon);
}
/** 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 program. Set options given commandline arguments.
* @param argc: number of commandline arguments.
* @param argv: array of commandline arguments.
* @return: exit status of the program.
*/
int
main(int argc, char* argv[])
{
int c;
const char* cfgfile = CONFIGFILE;
const char* winopt = NULL;
const char* log_ident_default;
int cmdline_verbose = 0;
int debug_mode = 0;
int need_pidfile = 1;
#ifdef UB_ON_WINDOWS
int cmdline_cfg = 0;
#endif
checklock_start();
log_init(NULL, 0, NULL);
log_ident_default = strrchr(argv[0],'/')?strrchr(argv[0],'/')+1:argv[0];
log_ident_set_default(log_ident_default);
log_ident_set(log_ident_default);
/* parse the options */
while( (c=getopt(argc, argv, "c:dhpvw:V")) != -1) {
switch(c) {
case 'c':
cfgfile = optarg;
#ifdef UB_ON_WINDOWS
cmdline_cfg = 1;
#endif
break;
case 'v':
cmdline_verbose++;
verbosity++;
break;
case 'p':
need_pidfile = 0;
break;
case 'd':
debug_mode++;
break;
case 'w':
winopt = optarg;
break;
case 'V':
print_build_options();
return 0;
case '?':
case 'h':
default:
usage();
return 1;
}
}
argc -= optind;
/* argv += optind; not using further arguments */
if(winopt) {
#ifdef UB_ON_WINDOWS
wsvc_command_option(winopt, cfgfile, cmdline_verbose,
cmdline_cfg);
#else
fatal_exit("option not supported");
#endif
}
if(argc != 0) {
usage();
return 1;
}
run_daemon(cfgfile, cmdline_verbose, debug_mode, need_pidfile);
log_init(NULL, 0, NULL); /* close logfile */
#ifndef unbound_testbound
if(log_get_lock()) {
lock_basic_destroy((lock_basic_type*)log_get_lock());
}
#endif
return 0;
}