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rbldnsd.c
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rbldnsd.c
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/* rbldnsd: main program
*/
#include "config.h"
#define _LARGEFILE64_SOURCE /* to define O_LARGEFILE if supported */
#ifdef WITH_SYSTEMD
#define _GNU_SOURCE /* for unshare(2) */
#include <sched.h>
#endif
#include "rbldnsd.h"
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <stdbool.h> /* for bool */
#include <errno.h>
#include <pwd.h>
#include <grp.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netdb.h>
#include <netinet/in.h>
#include <signal.h>
#include <syslog.h>
#include <time.h>
#include <sys/time.h> /* some systems can't include time.h and sys/time.h */
#include <fcntl.h>
#include <sys/wait.h>
#include "ev.h"
#include "sds/sds.h"
#ifndef NO_SELECT_H
# include <sys/select.h>
#endif
#ifndef NO_POLL
# include <poll.h>
#endif
#ifdef WITH_JEMALLOC
#include <jemalloc/jemalloc.h>
#else
#ifndef NO_MEMINFO
#if defined(__APPLE__)
#include <malloc/malloc.h>
#endif
#if defined(__linux__)
#include <malloc.h>
#endif
#if defined(__FreeBSD__)
#include <malloc_np.h>
#endif
#endif
#endif
#ifndef NO_TIMES
# include <sys/times.h>
#endif
#ifndef NO_STDINT_H
/* if system have stdint.h, assume it have inttypes.h too */
# include <inttypes.h>
#endif
#ifndef NO_STATS
# ifndef NO_IOVEC
# include <sys/uio.h>
# define STATS_IPC_IOVEC 1
# endif
#endif
#ifndef NO_DSO
# include <dlfcn.h>
#endif
#ifdef WITH_SYSTEMD
# include <systemd/sd-daemon.h>
# include <sched.h>
# include <sys/mount.h>
#endif
#ifndef NI_MAXHOST
# define NI_MAXHOST 1025
#endif
#ifndef NI_MAXSERV
# define NI_MAXSERV 32
#endif
#ifndef O_LARGEFILE
# define O_LARGEFILE 0
#endif
const char *version = VERSION;
const char *show_version = "rbldnsd " VERSION;
/* version to show in version.bind CH TXT reply */
char *progname; /* limited to 32 chars */
int logto;
void error(int errnum, const char *fmt, ...) {
char buf[256];
int l, pl;
va_list ap;
l = pl = ssprintf(buf, sizeof(buf), "%.30s: ", progname);
va_start(ap, fmt);
l += vssprintf(buf + l, sizeof(buf) - l, fmt, ap);
if (errnum)
l += ssprintf(buf + l, sizeof(buf) - l, ": %.50s", strerror(errnum));
if (logto & LOGTO_SYSLOG) {
fmt = buf + pl;
syslog(LOG_ERR, strchr(fmt, '%') ? "%s" : fmt, fmt);
}
buf[l++] = '\n';
write(2, buf, l);
_exit(1);
}
static unsigned recheck = 60; /* interval between checks for reload */
static int initialized; /* 1 when initialized */
static char *logfile; /* log file name */
#ifndef NO_STATS
static char *statsfile; /* statistics file */
static int stats_relative; /* dump relative, not absolute, stats */
#endif
int accept_in_cidr; /* accept 127.0.0.1/8-"style" CIDRs */
int nouncompress; /* disable on-the-fly decompression */
unsigned def_ttl = 35*60; /* default record TTL 35m */
unsigned min_ttl, max_ttl; /* TTL constraints */
const char def_rr[5] = "\177\0\0\2\0"; /* default A RR */
#define MAXSOCK 20 /* maximum # of supported sockets */
static int sock[MAXSOCK]; /* array of active sockets */
static int update_sock = -1; /* used for dynamic updates */
static int numsock; /* number of active sockets in sock[] */
static FILE *flog; /* log file */
static int flushlog; /* flush log after each line */
static struct zone *zonelist; /* list of zones we're authoritative for */
static int numzones; /* number of zones in zonelist */
int lazy; /* don't return AUTH section by default */
static int fork_on_reload; /* >0 - perform fork on reloads, <0 - this is a child of reloading parent */
static int can_reload; /* block reload when another reload is there */
static int pending_reload = 0;
static ev_signal ev_hup, ev_usr1, ev_usr2, ev_term, ev_int;
#if STATS_IPC_IOVEC
static struct iovec *stats_iov;
#endif
#ifndef NO_DSO
hook_reload_check_t hook_reload_check;
hook_reload_t hook_reload;
hook_query_access_t hook_query_access;
hook_query_result_t hook_query_result;
#endif
/* a list of zonetypes. */
const struct dstype *ds_types[] = {
dstype(ip4set),
dstype(ip4tset),
dstype(ip4trie),
dstype(ip6tset),
dstype(ip6trie),
dstype(dnset),
dstype(dnhash),
dstype(dnhash_fixed),
dstype(combined),
dstype(generic),
dstype(acl),
dstype(aclkey),
NULL
};
static int do_reload(int do_fork, struct ev_loop *loop);
static int satoi(const char *s) {
int n = 0;
if (*s < '0' || *s > '9') return -1;
do n = n * 10 + (*s++ - '0');
while (*s >= '0' && *s <= '9');
return *s ? -1 : n;
}
static void NORETURN usage(int exitcode) {
const struct dstype **dstp;
printf(
"%s: rbl dns daemon version %s\n"
"Usage is: %s options zonespec...\n"
"where options are:\n"
" -u user[:group] - run as this user:group (rbldns)\n"
" -r rootdir - chroot to this directory\n"
" -w workdir - working directory with zone files\n"
" -b address[/port] - bind to (listen on) this address (required)\n"
#ifndef NO_IPv6
" -4 - use IPv4 socket type\n"
" -6 - use IPv6 socket type\n"
#endif
" -t ttl - default TTL value to set in answers (35m)\n"
" -v - hide version information in replies to version.bind CH TXT\n"
" (second -v makes rbldnsd to refuse such requests completely)\n"
" -e - enable CIDR ranges where prefix is not on the range boundary\n"
" (by default ranges such 127.0.0.1/8 will be rejected)\n"
" -c check - time interval to check for data file updates (1m)\n"
" -p pidfile - write pid to specified file\n"
" -n - do not become a daemon\n"
" -f - fork a child process while reloading zones, to process requests\n"
" during reload (may double memory requiriments)\n"
" -q - quickstart, load zones after backgrounding\n"
" -l [+]logfile - log queries and answers to this file (+ for unbuffered)\n"
" -U address/port or unix socket - socket credentials for updates\n"
#ifndef NO_STATS
" -s [+]statsfile - write a line with short statistics summary into this\n"
" file every `check' (-c) secounds, for rrdtool-like applications\n"
" (+ to log relative, not absolute, statistics counters)\n"
#endif
" -a - omit AUTH section from regular replies, do not return list of\n"
" nameservers, but only return NS info when explicitly asked.\n"
" This is an equivalent of bind9 \"minimal-answers\" setting.\n"
" In future versions this mode will be the default.\n"
" -A - put AUTH section in every reply.\n"
" -F facility - Log facility for syslog. Default is 'daemon'.\n"
#ifndef NO_ZLIB
" -C - disable on-the-fly decompression of dataset files\n"
#endif
#ifndef NO_DZO
" -x extension - load given extension module (.so file)\n"
" -X extarg - pass extarg to extension init routine\n"
#endif
" -d - dump all zones in BIND format to standard output and exit\n"
"each zone specified using `name:type:file,file...'\n"
"syntax, repeated names constitute the same zone.\n"
"Available dataset types:\n"
, progname, version, progname);
for(dstp = ds_types; *dstp; ++dstp)
printf(" %s - %s\n", (*dstp)->dst_name, (*dstp)->dst_descr);
exit(exitcode);
}
static inline int sockaddr_in_equal(const struct sockaddr_in *addr1,
const struct sockaddr_in *addr2)
{
return (addr1->sin_port == addr2->sin_port
&& addr1->sin_addr.s_addr == addr2->sin_addr.s_addr);
}
#ifndef NO_IPv6
static inline int sockaddr_in6_equal(const struct sockaddr_in6 *addr1,
const struct sockaddr_in6 *addr2)
{
if (memcmp(addr1->sin6_addr.s6_addr, addr2->sin6_addr.s6_addr, 16) != 0)
return 0;
return (addr1->sin6_port == addr2->sin6_port
&& addr1->sin6_flowinfo == addr2->sin6_flowinfo
&& addr1->sin6_scope_id == addr2->sin6_scope_id);
}
#endif
static inline int sockaddr_equal(const struct sockaddr *addr1,
const struct sockaddr *addr2)
{
if (addr1->sa_family != addr2->sa_family)
return 0;
switch (addr1->sa_family) {
case AF_INET:
return sockaddr_in_equal((const struct sockaddr_in *)addr1,
(const struct sockaddr_in *)addr2);
#ifndef NO_IPv6
case AF_INET6:
return sockaddr_in6_equal((const struct sockaddr_in6 *)addr1,
(const struct sockaddr_in6 *)addr2);
#endif
default:
error(0, "unknown address family (%d)", addr1->sa_family);
}
}
/* already_bound(addr, addrlen)
*
* Determine whether we've already bound to a particular address.
* This is here mostly to deal with the fact that on certain systems,
* gethostbyname()/getaddrinfo() can return a duplicate 127.0.0.1
* for 'localhost'. See
* - http://sourceware.org/bugzilla/show_bug.cgi?id=4980
* - https://bugzilla.redhat.com/show_bug.cgi?id=496300
*/
static int already_bound(const struct sockaddr *addr, socklen_t addrlen) {
#ifdef NO_IPv6
struct sockaddr_in addr_buf;
#else
struct sockaddr_in6 addr_buf;
#endif
struct sockaddr *boundaddr = (struct sockaddr *)&addr_buf;
socklen_t buflen;
int i;
for (i = 0; i < numsock; i++) {
buflen = sizeof(addr_buf);
if (getsockname(sock[i], boundaddr, &buflen) < 0)
error(errno, "getsockname failed");
if (buflen == addrlen && sockaddr_equal(boundaddr, addr))
return 1;
}
return 0;
}
static int newsocket(struct addrinfo *ai) {
int fd;
char host[NI_MAXHOST], serv[NI_MAXSERV];
if (already_bound(ai->ai_addr, ai->ai_addrlen))
return -1;
if (numsock >= MAXSOCK)
error(0, "too many listening sockets (%d max)", MAXSOCK);
fd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (fd < 0) {
if (errno == EAFNOSUPPORT) return 0;
error(errno, "unable to create socket");
}
getnameinfo(ai->ai_addr, ai->ai_addrlen,
host, sizeof(host), serv, sizeof(serv),
NI_NUMERICHOST|NI_NUMERICSERV);
if (bind(fd, ai->ai_addr, ai->ai_addrlen) < 0)
error(errno, "unable to bind to %s/%s", host, serv);
dslog(LOG_INFO, 0, "listening on %s/%s", host, serv);
return fd;
}
static int newsocket_unix(const char *path)
{
int nelts, i, fd;
sds *elts = sdssplitlen(path, strlen(path), ":", 1, &nelts);
struct sockaddr_un un;
unsigned mode = 00644;
size_t pwlen;
char *pwbuf, *p;
struct passwd pw, *ppw;
struct group gr, *pgr;
uid_t owner = (uid_t)-1;
gid_t group = (gid_t)-1;
int has_group = false;
if (nelts < 1) {
error(0, "invalid path: %s", path);
}
un.sun_family = AF_UNIX;
estrlcpy(un.sun_path, elts[0], sizeof (un.sun_path));
#if defined(FREEBSD) || defined(__APPLE__)
un.sun_len = SUN_LEN (&un);
#endif
#ifdef _SC_GETPW_R_SIZE_MAX
pwlen = sysconf (_SC_GETPW_R_SIZE_MAX);
if (pwlen <= 0) {
pwlen = 8192;
}
#else
pwlen = 8192;
#endif
pwbuf = emalloc(pwlen);
for (i = 1; i < nelts; i ++) {
if (strncmp(elts[i], "mode=", sizeof ("mode=") - 1) == 0) {
p = strchr(elts[i], '=');
/* XXX: add error check */
mode = strtoul (p + 1, NULL, 8);
if (mode == 0) {
error(0, "bad mode: %s", p + 1);
}
}
else if (strncmp(elts[i], "owner=", sizeof ("owner=") - 1) == 0) {
p = strchr(elts[i], '=');
if (getpwnam_r(p + 1, &pw, pwbuf, pwlen, &ppw) != 0 || ppw == NULL) {
error(errno, "bad user: %s", p + 1);
}
owner = pw.pw_uid;
if (!has_group) {
group = pw.pw_gid;
}
}
else if (strncmp(elts[i], "group=", sizeof ("group=") - 1) == 0) {
p = strchr(elts[i], '=');
if (getgrnam_r(p + 1, &gr, pwbuf, pwlen, &pgr) != 0 || pgr == NULL) {
error(errno, "bad group: %s", p + 1);
}
has_group = true;
group = gr.gr_gid;
}
}
sdsfreesplitres(elts, nelts);
free(pwbuf);
fd = socket(AF_UNIX, SOCK_DGRAM, 0);
if (fd == -1) {
error(errno, "unable to create socket");
}
if (bind(fd, (struct sockaddr *)&un, sizeof(un)) < 0) {
if (errno == EADDRINUSE) {
/* Try to unlink */
dslog(LOG_INFO, 0, "unlinking stale socket %s", un.sun_path);
unlink(un.sun_path);
if (bind(fd, (struct sockaddr *)&un, sizeof(un)) < 0) {
error(errno, "unable to bind to unix socket: %s", path);
}
}
else {
error(errno, "unable to bind to unix socket: %s", path);
}
}
if (owner != (uid_t)-1 || group != (gid_t)-1) {
if (chown(un.sun_path, owner, group) == -1) {
error(errno, "cannot change owner for %s to %d:%d: %s",
un.sun_path, (int)owner, (int)group,
strerror(errno));
}
}
if (chmod(un.sun_path, mode) == -1) {
error(errno, "cannot change mode for %s to %od %s",
un.sun_path, mode, strerror(errno));
}
dslog(LOG_INFO, 0, "listening on %s", un.sun_path);
return fd;
}
static int
initsockets(const char *bindaddr[MAXSOCK], int *dest, int nba, int UNUSED family) {
int i, x = 0;
char *host, *serv;
const char *ba;
struct addrinfo hints, *aires, *ai;
memset(&hints, 0, sizeof(hints));
hints.ai_family = family;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_flags = AI_PASSIVE;
for (i = 0; i < nba; ++i) {
ba = bindaddr[i];
if (ba[0] == '/' || ba[0] == '.') {
int nfd = newsocket_unix(ba);
if (nfd != -1) {
dest[numsock++] = nfd;
}
}
else {
host = estrdup(ba);
serv = strchr(host, '/');
if (serv) {
*serv++ = '\0';
if (!*host)
error(0, "missing host part in bind address `%.60s'", ba);
}
if (!serv || !*serv)
serv = "domain";
x = getaddrinfo(host, serv, &hints, &aires);
if (x != 0)
error(0, "%.60s: %s", ba, gai_strerror(x));
for (ai = aires, x = 0; ai; ai = ai->ai_next) {
int nfd = newsocket(ai);
if (nfd != -1) {
++x;
dest[numsock++] = nfd;
}
}
if (!x)
error(0, "%.60s: no available protocols", ba);
freeaddrinfo(aires);
free(host);
}
}
endservent();
endhostent();
for (i = 0; i < numsock; ++i) {
x = 65536;
do {
if (setsockopt(dest[i], SOL_SOCKET, SO_RCVBUF, (void *) &x, sizeof x) == 0) {
break;
}
} while ((x -= (x >> 5)) >= 1024);
}
return numsock;
}
static struct {
int facility;
const char *name;
} facility_names[] = {
{ LOG_AUTH, "auth" },
{ LOG_AUTHPRIV, "authpriv" },
{ LOG_CRON, "cron" },
{ LOG_DAEMON, "daemon" },
{ LOG_FTP, "ftp" },
{ LOG_KERN, "kern" },
{ LOG_LOCAL0, "local0" },
{ LOG_LOCAL1, "local1" },
{ LOG_LOCAL2, "local2" },
{ LOG_LOCAL3, "local3" },
{ LOG_LOCAL4, "local4" },
{ LOG_LOCAL5, "local5" },
{ LOG_LOCAL6, "local6" },
{ LOG_LOCAL7, "local7" },
{ LOG_LPR, "lpr" },
{ LOG_MAIL, "mail" },
{ LOG_NEWS, "news" },
{ LOG_SYSLOG, "syslog" },
{ LOG_USER, "user" },
{ LOG_UUCP, "uucp" },
};
static int logfacility_lookup(const char *facility, int *logfacility) {
unsigned int t;
if ( logfacility == NULL ) {
return 0;
}
for ( t=0; t < sizeof(facility_names) / sizeof(facility_names[0]); t++ ) {
if ( !strncmp(facility_names[t].name, facility, strlen(facility_names[t].name)+1) ) {
*logfacility = facility_names[t].facility;
return 1;
}
}
*logfacility = LOG_DAEMON;
return 0;
}
#ifdef WITH_SYSTEMD
static void systemd_initsockets(void) {
int fd_num, fd_count;
char host[NI_MAXHOST], serv[NI_MAXSERV];
struct sockaddr_storage ai;
socklen_t addrlen = sizeof(ai);
fd_count = sd_listen_fds(1);
for (fd_num = 0; fd_num < fd_count; fd_num++) {
int fd = SD_LISTEN_FDS_START + fd_num;
if (numsock >= MAXSOCK) {
error(0, "too many listening sockets (%d max)", MAXSOCK);
}
if (sd_is_socket(fd, AF_UNSPEC, SOCK_DGRAM, -1) <= 0) {
dslog(LOG_WARNING, 0, "systemd listening socket %d is not a datagram socket", fd);
close(fd);
continue;
}
getsockname(fd, (struct sockaddr *)&ai, &addrlen);
getnameinfo((struct sockaddr *)&ai, addrlen,
host, sizeof(host), serv, sizeof(serv),
NI_NUMERICHOST|NI_NUMERICSERV);
dslog(LOG_INFO, 0, "systemd socket listening on %s/%s (fd %d)", host, serv, fd);
sock[numsock++] = fd;
}
}
#endif
static void init(int argc, char **argv, struct ev_loop *loop) {
int c;
char *p;
const char *user = NULL;
const char *rootdir = NULL, *workdir = NULL, *pidfile = NULL, *facility = NULL;
const char *bindaddr[MAXSOCK];
const char *update_addr = NULL;
int logfacility;
int nba = 0;
uid_t uid = 0;
gid_t gid = 0;
int nodaemon = 0, quickstart = 0, dump = 0, nover = 0, forkon = 0, dry_run = 0;
#ifdef NO_IPv6
int family = AF_INET;
#else
int family = AF_UNSPEC;
#endif
int cfd = -1;
const struct zone *z;
#ifndef NO_DSO
char *ext = NULL, *extarg = NULL;
int (*extinit)(const char *arg, struct zone *zonelist) = NULL;
#endif
if ((progname = strrchr(argv[0], '/')) != NULL)
argv[0] = ++progname;
else
progname = argv[0];
if (argc <= 1) usage(1);
while((c = getopt(argc, argv, "u:r:b:w:t:c:p:nel:qs:h46dvaAfF:Cx:X:DU:")) != EOF)
switch(c) {
case 'u': user = optarg; break;
case 'r': rootdir = optarg; break;
case 'b':
if (nba >= MAXSOCK)
error(0, "too many addresses to listen on (%d max)", MAXSOCK);
bindaddr[nba++] = optarg;
break;
case 'U':
update_addr = optarg;
break;
#ifndef NO_IPv6
case '4': family = AF_INET; break;
case '6': family = AF_INET6; break;
#else
case '4': break;
case '6': error(0, "IPv6 support isn't compiled in");
#endif
case 'w': workdir = optarg; break;
case 'p': pidfile = optarg; break;
case 't':
p = optarg;
if (*p == ':') ++p;
else {
if (!(p = parse_time(p, &def_ttl)) || !def_ttl ||
(*p && *p++ != ':'))
error(0, "invalid ttl (-t) value `%.50s'", optarg);
}
if (*p == ':') ++p;
else if (*p) {
if (!(p = parse_time(p, &min_ttl)) || (*p && *p++ != ':'))
error(0, "invalid minttl (-t) value `%.50s'", optarg);
}
if (*p == ':') ++p;
else if (*p) {
if (!(p = parse_time(p, &max_ttl)) || (*p && *p++ != ':'))
error(0, "invalid maxttl (-t) value `%.50s'", optarg);
}
if (*p)
error(0, "invalid value for -t (ttl) option: `%.50s'", optarg);
if ((min_ttl && max_ttl && min_ttl > max_ttl) ||
(min_ttl && def_ttl < min_ttl) ||
(max_ttl && def_ttl > max_ttl))
error(0, "inconsistent def:min:max ttl: %u:%u:%u",
def_ttl, min_ttl, max_ttl);
break;
case 'c':
if (!(p = parse_time(optarg, &recheck)) || *p)
error(0, "invalid check interval (-c) value `%.50s'", optarg);
break;
case 'n': nodaemon = 1; break;
case 'e': accept_in_cidr = 1; break;
case 'l':
logfile = optarg;
if (*logfile != '+') {
flushlog = 0;
}
else {
++logfile;
flushlog = 1;
}
if (!*logfile) {
logfile = NULL;
flushlog = 0;
}
else if (logfile[0] == '-' && logfile[1] == '\0') {
/* No need to reopen stdout */
logfile = NULL;
flog = stdout;
}
break;
break;
case 's':
#ifdef NO_STATS
fprintf(stderr,
"%s: warning: no statistics counters support is compiled in\n",
progname);
#else
statsfile = optarg;
if (*statsfile != '+') stats_relative = 0;
else ++statsfile, stats_relative = 1;
if (!*statsfile) statsfile = NULL;
#endif
break;
case 'q': quickstart = 1; break;
case 'd':
dump = 1;
break;
case 'D': dry_run = 1; break;
case 'v': show_version = nover++ ? NULL : "rbldnsd"; break;
case 'a': lazy = 1; break;
case 'A': lazy = 0; break;
case 'f': forkon = 1; break;
case 'F': facility = optarg; break;
case 'C': nouncompress = 1; break;
#ifndef NO_DSO
case 'x': ext = optarg; break;
case 'X': extarg = optarg; break;
#else
case 'x':
case 'X':
error(0, "extension support is not compiled in");
#endif
case 'h': usage(0);
default: error(0, "type `%.50s -h' for help", progname);
}
/* options switch end */
if (!(argc -= optind))
error(0, "no zone(s) to service specified (-h for help)");
argv += optind;
if (dump || dry_run) {
time_t now;
logto = LOGTO_STDERR;
for(c = 0; c < argc; ++c)
zonelist = addzone(zonelist, argv[c]);
init_zones_caches(zonelist);
if (rootdir && (chdir(rootdir) < 0 || chroot(rootdir) < 0))
error(errno, "unable to chroot to %.50s", rootdir);
if (workdir && chdir(workdir) < 0)
error(errno, "unable to chdir to %.50s", workdir);
if (!do_reload(0, loop))
error(0, "zone loading errors, aborting");
if (dump) {
now = time(NULL);
printf("; zone dump made %s", ctime(&now));
printf("; rbldnsd version %s\n", version);
for (z = zonelist; z; z = z->z_next)
dumpzone(z, stdout);
fflush(stdout);
exit(ferror(stdout) ? 1 : 0);
}
else {
/* Dry run */
printf("zones loaded successfully\n");
fflush(stdout);
exit(ferror(stdout) ? 1 : 0);
}
}
if (!nba
#ifdef WITH_SYSTEMD
&& !sd_listen_fds(0)
#endif
) {
error(0, "no address to listen on (-b option) specified");
}
if ( facility == NULL ) {
logfacility = LOG_DAEMON;
}
else {
if ( logfacility_lookup(facility, &logfacility) == 0 ) {
error(0, "log facility %s is not valid", facility);
}
}
tzset();
#ifdef WITH_SYSTEMD
if (getenv("NOTIFY_SOCKET")) {
/* started as a systemd Type=notify service */
openlog(progname, LOG_PID|LOG_NDELAY, LOG_DAEMON);
logto = LOGTO_SYSLOG;
/* bind mount the systemd notification socket inside our chroot */
if (rootdir) {
int fd;
char *chroot_socket;
chroot_socket = emalloc(strlen(rootdir) + strlen("/systemd_notify") + 1);
strcpy(chroot_socket, rootdir);
strcat(chroot_socket, "/systemd_notify");
/* create an empty file to be used as a target for the bind mount */
if ((fd = open(chroot_socket, O_WRONLY|O_CREAT|O_TRUNC, 0644)) < 0) {
error(0, "creation of %s failed", chroot_socket);
}
close(fd);
/* Create a new mount namespace with private propagation to tie the
* lifetime of the bind mount to the rbldnsd process.
* Thanks to this the daemon does not need to remove the bind mount
* before exiting.
*/
if (unshare(CLONE_NEWNS) != 0) {
error(errno, "unable to unshare(CLONE_NEWNS)");
}
if (mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL) != 0) {
error(errno, "unable to mark the mount namespace MS_PRIVATE)");
}
/* bind mount the notification protocol socket over the empty file */
if (mount(getenv("NOTIFY_SOCKET"), chroot_socket, NULL, MS_BIND, NULL) != 0) {
error(errno, "unable to bind mount %s", chroot_socket);
}
free(chroot_socket);
/* and instruct libsystemd to use the new socket */
setenv("NOTIFY_SOCKET", "/systemd_notify", 1);
}
} else
#endif
if (nodaemon)
logto = LOGTO_STDOUT|LOGTO_STDERR;
else
{
/* fork early so that logging will be from right pid */
int pfd[2];
if (pipe(pfd) < 0) error(errno, "pipe() failed");
c = fork();
if (c < 0) error(errno, "fork() failed");
if (c > 0) {
close(pfd[1]);
if (read(pfd[0], &c, 1) < 1) exit(1);
else exit(0);
}
/* Forked process */
ev_loop_fork(loop);
cfd = pfd[1];
close(pfd[0]);
openlog(progname, LOG_PID|LOG_NDELAY, logfacility);
logto = LOGTO_STDERR|LOGTO_SYSLOG;
if (!quickstart && !flog) logto |= LOGTO_STDOUT;
}
initsockets(bindaddr, sock, nba, family);
if (update_addr) {
if (initsockets(&update_addr, &update_sock, 1, family) != 1) {
error(0, "unable to listen for updates on `%s'", update_addr);
}
}
#ifdef WITH_SYSTEMD
systemd_initsockets();
#endif
#ifndef NO_DSO
if (ext) {
void *handle = dlopen(ext, RTLD_NOW);
if (!handle)
error(0, "unable to load extension `%s': %s", ext, dlerror());
extinit = dlsym(handle, "rbldnsd_extension_init");
if (!extinit)
error(0, "unable to find extension init routine in `%s'", ext);
}
#endif
if (!user && !(uid = getuid()))
user = "rbldns";
if (!user)
p = NULL;
else {
if ((p = strchr(user, ':')) != NULL)
*p++ = '\0';
if ((c = satoi(user)) >= 0)
uid = c, gid = c;
else {
struct passwd *pw = getpwnam(user);
if (!pw)
error(0, "unknown user `%s'", user);
uid = pw->pw_uid;
gid = pw->pw_gid;
endpwent();
}
}
if (!uid)
error(0, "daemon should not run as root, specify -u option");
if (p) {
if ((c = satoi(p)) >= 0)
gid = c;
else {
struct group *gr = getgrnam(p);
if (!gr)
error(0, "unknown group `%s'", p);
gid = gr->gr_gid;
endgrent();
}
p[-1] = ':';
}
if (pidfile) {
int fdpid;
char buf[40];
c = sprintf(buf, "%ld\n", (long)getpid());
fdpid = open(pidfile, O_CREAT|O_WRONLY|O_TRUNC, 0644);
if (fdpid < 0 || write(fdpid, buf, c) < c)
error(errno, "unable to write pidfile");
close(fdpid);
}
if (rootdir && (chdir(rootdir) < 0 || chroot(rootdir) < 0))
error(errno, "unable to chroot to %.50s", rootdir);
if (workdir && chdir(workdir) < 0)
error(errno, "unable to chdir to %.50s", workdir);
if (user)
if (setgroups(1, &gid) < 0 || setgid(gid) < 0 || setuid(uid) < 0)
error(errno, "unable to setuid(%d:%d)", (int)uid, (int)gid);
for(c = 0; c < argc; ++c)
zonelist = addzone(zonelist, argv[c]);
init_zones_caches(zonelist);
#ifndef NO_DSO
if (extinit && extinit(extarg, zonelist) != 0)
error(0, "unable to iniitialize extension `%s'", ext);
#endif
if (!quickstart && !do_reload(0, loop))
error(0, "zone loading errors, aborting");
/* count number of zones */
for(c = 0, z = zonelist; z; z = z->z_next)
++c;
numzones = c;
#if STATS_IPC_IOVEC
stats_iov = (struct iovec *)emalloc(numzones * sizeof(struct iovec));
for(c = 0, z = zonelist; z; z = z->z_next, ++c) {
stats_iov[c].iov_base = (char*)&z->z_stats;
stats_iov[c].iov_len = sizeof(z->z_stats);
}
#endif
dslog(LOG_INFO, 0, "rbldnsd version %s started (%d socket(s), %d zone(s))",
version, numsock, numzones);
initialized = 1;
if (cfd >= 0) {
write(cfd, "", 1);
close(cfd);
close(0); close(2);
if (!flog) close(1);
setsid();
logto = LOGTO_SYSLOG;
}
if (quickstart)
do_reload(0, loop);
/* only set "main" fork_on_reload after first reload */
fork_on_reload = forkon;
}
#ifndef NO_STATS
struct dnsstats gstats;
static struct dnsstats gptot;
static time_t stats_time;
static void dumpstats(void) {
struct dnsstats tot;
char name[DNS_MAXDOMAIN+1];
FILE *f;
struct zone *z;
f = fopen(statsfile, "a");
if (f)
fprintf(f, "%ld", (long)time(NULL));
#define C ":%" PRI_DNSCNT
tot = gstats;
for(z = zonelist; z; z = z->z_next) {
#define add(x) tot.x += z->z_stats.x
add(b_in); add(b_out);
add(q_ok); add(q_nxd); add(q_err);
#undef add
if (f) {
dns_dntop(z->z_dn, name, sizeof(name));
#define delta(x) z->z_stats.x - z->z_pstats.x
fprintf(f, " %s" C C C C C,