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1144 lines (1040 loc) · 29.6 KB
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/* rbldnsd: main program
*/
#define _LARGEFILE64_SOURCE /* to define O_LARGEFILE if supported */
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <pwd.h>
#include <grp.h>
#include <sys/socket.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 "rbldnsd.h"
#ifndef NO_SELECT_H
# include <sys/select.h>
#endif
#ifndef NO_POLL
# include <sys/poll.h>
#endif
#ifndef NO_MEMINFO
# include <malloc.h>
#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
#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 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 */
#if STATS_IPC_IOVEC
static struct iovec *stats_iov;
#endif
#ifndef NO_DSO
int (*hook_reload_check)(), (*hook_reload)();
int (*hook_query_access)(), (*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),
#ifdef DNHASH
dstype(dnhash),
#endif
dstype(combined),
dstype(generic),
dstype(acl),
NULL
};
static int do_reload(int do_fork);
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"
#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"
#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 volatile int signalled;
#define SIGNALLED_RELOAD 0x01
#define SIGNALLED_RELOG 0x02
#define SIGNALLED_LSTATS 0x04
#define SIGNALLED_SSTATS 0x08
#define SIGNALLED_ZSTATS 0x10
#define SIGNALLED_TERM 0x20
#ifdef NO_IPv6
static void newsocket(struct sockaddr_in *sin) {
int fd;
const char *host = ip4atos(ntohl(sin->sin_addr.s_addr));
if (numsock >= MAXSOCK)
error(0, "too many listening sockets (%d max)", MAXSOCK);
fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (fd < 0)
error(errno, "unable to create socket");
if (bind(fd, (struct sockaddr *)sin, sizeof(*sin)) < 0)
error(errno, "unable to bind to %s/%d", host, ntohs(sin->sin_port));
dslog(LOG_INFO, 0, "listening on %s/%d", host, ntohs(sin->sin_port));
sock[numsock++] = fd;
}
#else
static int newsocket(struct addrinfo *ai) {
int fd;
char host[NI_MAXHOST], serv[NI_MAXSERV];
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);
sock[numsock++] = fd;
return 1;
}
#endif
static void
initsockets(const char *bindaddr[MAXSOCK], int nba, int UNUSED family) {
int i, x;
char *host, *serv;
const char *ba;
#ifdef NO_IPv6
struct sockaddr_in sin;
ip4addr_t sinaddr;
int port;
struct servent *se;
struct hostent *he;
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
if (!(se = getservbyname("domain", "udp")))
port = htons(DNS_PORT);
else
port = se->s_port;
#else
struct addrinfo hints, *aires, *ai;
memset(&hints, 0, sizeof(hints));
hints.ai_family = family;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_flags = AI_PASSIVE;
#endif
for (i = 0; i < nba; ++i) {
ba = bindaddr[i];
host = estrdup(ba);
serv = strchr(host, '/');
if (serv) {
*serv++ = '\0';
if (!*host)
error(0, "missing host part in bind address `%.60s'", ba);
}
#ifdef NO_IPv6
if (!serv || !*serv)
sin.sin_port = port;
else if ((x = satoi(serv)) > 0 && x <= 0xffff)
sin.sin_port = htons(x);
else if (!(se = getservbyname(serv, "udp")))
error(0, "unknown service in `%.60s'", ba);
else
sin.sin_port = se->s_port;
if (ip4addr(host, &sinaddr, NULL) > 0) {
sin.sin_addr.s_addr = htonl(sinaddr);
newsocket(&sin);
}
else if (!(he = gethostbyname(host))
|| he->h_addrtype != AF_INET
|| he->h_length != 4
|| !he->h_addr_list[0])
error(0, "unknown host in `%.60s'", ba);
else {
for(x = 0; he->h_addr_list[x]; ++x) {
memcpy(&sin.sin_addr, he->h_addr_list[x], 4);
newsocket(&sin);
}
}
#else
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)
if (newsocket(ai))
++x;
if (!x)
error(0, "%.60s: no available protocols", ba);
freeaddrinfo(aires);
#endif
free(host);
}
endservent();
endhostent();
for (i = 0; i < numsock; ++i) {
x = 65536;
do
if (setsockopt(sock[i], SOL_SOCKET, SO_RCVBUF, (void*)&x, sizeof x) == 0)
break;
while ((x -= (x >> 5)) >= 1024);
}
}
static void init(int argc, char **argv) {
int c;
char *p;
const char *user = NULL;
const char *rootdir = NULL, *workdir = NULL, *pidfile = NULL;
const char *bindaddr[MAXSOCK];
int nba = 0;
uid_t uid = 0;
gid_t gid = 0;
int nodaemon = 0, quickstart = 0, dump = 0, nover = 0, forkon = 0;
int family = AF_UNSPEC;
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:h46dvaAfCx:X:")) != 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;
#ifndef NO_IPv6
10000
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')
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':
#ifdef NO_MASTER_DUMP
error(0, "master-format dump option (-d) isn't compiled in");
#endif
dump = 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 '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);
}
if (!(argc -= optind))
error(0, "no zone(s) to service specified (-h for help)");
argv += optind;
#ifndef NO_MASTER_DUMP
if (dump) {
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))
error(0, "zone loading errors, aborting");
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);
}
#endif
if (!nba)
error(0, "no address to listen on (-b option) specified");
tzset();
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);
}
cfd = pfd[1];
close(pfd[0]);
openlog(progname, LOG_PID|LOG_NDELAY, LOG_DAEMON);
logto = LOGTO_STDERR|LOGTO_SYSLOG;
if (!quickstart && !flog) logto |= LOGTO_STDOUT;
}
initsockets(bindaddr, nba, family);
#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))
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);
/* only set "main" fork_on_reload after first reload */
fork_on_reload = forkon;
}
static void sighandler(int sig) {
switch(sig) {
case SIGHUP:
signalled |= SIGNALLED_RELOG|SIGNALLED_RELOAD;
break;
case SIGALRM:
#ifndef HAVE_SETITIMER
alarm(recheck);
#endif
signalled |= SIGNALLED_RELOAD|SIGNALLED_SSTATS;
break;
#ifndef NO_STATS
case SIGUSR1:
signalled |= SIGNALLED_LSTATS|SIGNALLED_SSTATS;
break;
case SIGUSR2:
signalled |= SIGNALLED_LSTATS|SIGNALLED_SSTATS|SIGNALLED_ZSTATS;
break;
#endif
case SIGTERM:
case SIGINT:
signalled |= SIGNALLED_TERM;
break;
}
}
static sigset_t ssblock; /* signals to block during zone reload */
static sigset_t ssempty; /* empty set */
static void setup_signals(void) {
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = sighandler;
sigemptyset(&ssblock);
sigemptyset(&ssempty);
sigaction(SIGHUP, &sa, NULL);
sigaddset(&ssblock, SIGHUP);
sigaction(SIGALRM, &sa, NULL);
sigaddset(&ssblock, SIGALRM);
#ifndef NO_STATS
sigaction(SIGUSR1, &sa, NULL);
sigaddset(&ssblock, SIGUSR1);
sigaction(SIGUSR2, &sa, NULL);
sigaddset(&ssblock, SIGUSR2);
#endif
sigaction(SIGTERM, &sa, NULL);
sigaction(SIGINT, &sa, NULL);
signal(SIGPIPE, SIG_IGN); /* in case logfile is FIFO */
}
#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,
name,
delta(q_ok) + delta(q_nxd) + delta(q_err),
delta(q_ok), delta(q_nxd),
delta(b_in), delta(b_out));
#undef delta
}
if (stats_relative)
z->z_pstats = z->z_stats;
}
if (f) {
#define delta(x) tot.x - gptot.x
fprintf(f, " *" C C C C C "\n",
delta(q_ok) + delta(q_nxd) + delta(q_err),
delta(q_ok), delta(q_nxd),
delta(b_in), delta(b_out));
#undef delta
fclose(f);
}
if (stats_relative)
gptot = tot;
#undef C
}
static void dumpstats_z(void) {
FILE *f = fopen(statsfile, "a");
if (f) {
fprintf(f, "%ld\n", (long)time(NULL));
fclose(f);
}
}
static void logstats(int reset) {
time_t t = time(NULL);
time_t d = t - stats_time;
struct dnsstats tot = gstats;
char name[DNS_MAXDOMAIN+1];
struct zone *z;
#define C(x) " " #x "=%" PRI_DNSCNT
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
dns_dntop(z->z_dn, name, sizeof(name));
dslog(LOG_INFO, 0,
"stats for %ldsecs zone %.60s:" C(tot) C(ok) C(nxd) C(err) C(in) C(out),
(long)d, name,
z->z_stats.q_ok + z->z_stats.q_nxd + z->z_stats.q_err,
z->z_stats.q_ok, z->z_stats.q_nxd, z->z_stats.q_err,
z->z_stats.b_in, z->z_stats.b_out);
}
dslog(LOG_INFO, 0,
"stats for %ldsec:" C(tot) C(ok) C(nxd) C(err) C(in) C(out),
(long)d,
tot.q_ok + tot.q_nxd + tot.q_err,
tot.q_ok, tot.q_nxd, tot.q_err,
tot.b_in, tot.b_out);
#undef C
if (reset) {
for(z = zonelist; z; z = z->z_next) {
memset(&z->z_stats, 0, sizeof(z->z_stats));
memset(&z->z_pstats, 0, sizeof(z->z_pstats));
}
memset(&gstats, 0, sizeof(gstats));
memset(&gptot, 0, sizeof(gptot));
stats_time = t;
}
}
#if STATS_IPC_IOVEC
# define ipc_read_stats(fd) readv(fd, stats_iov, numzones)
# define ipc_write_stats(fd) writev(fd, stats_iov, numzones)
#else
static void ipc_read_stats(int fd) {
struct zone *z;
for(z = zonelist; z; z = z->z_next)
if (read(fd, &z->z_stats, sizeof(z->z_stats)) <= 0)
break;
}
static void ipc_write_stats(int fd) {
const struct zone *z;
for(z = zonelist; z; z = z->z_next)
if (write(fd, &z->z_stats, sizeof(z->z_stats)) <= 0)
break;
}
#endif
#else
# define ipc_read_stats(fd)
# define ipc_write_stats(fd)
#endif
static void reopenlog(void) {
if (logfile) {
int fd;
if (flog) fclose(flog);
fd = open(logfile, O_WRONLY|O_APPEND|O_CREAT|O_NONBLOCK|O_LARGEFILE, 0644);
if (fd < 0 || (flog = fdopen(fd, "a")) == NULL) {
dslog(LOG_WARNING, 0, "error (re)opening logfile `%.50s': %s",
logfile, strerror(errno));
if (fd >= 0) close(fd);
flog = NULL;
}
}
else if (flog && !flushlog) { /* log to stdout */
clearerr(flog);
fflush(flog);
}
}
static void check_expires(void) {
struct zone *zone;
time_t now = time(NULL);
for (zone = zonelist; zone; zone = zone->z_next) {
if (!zone->z_stamp)
continue;
if (zone->z_expires && zone->z_expires < now) {
zlog(LOG_WARNING, zone, "zone data expired, zone will not be serviced");
zone->z_stamp = 0;
}
}
}
static int do_reload(int do_fork) {
int r;
char ibuf[150];
int ip;
struct dataset *ds;
struct zone *zone;
pid_t cpid = 0; /* child pid; =0 to make gcc happy */
int cfd = 0; /* child stats fd; =0 to make gcc happy */
#ifndef NO_TIMES
struct tms tms;
clock_t utm, etm;
#ifndef HZ
static clock_t HZ;
#endif
#endif /* NO_TIMES */
ds = nextdataset2reload(NULL);
if (!ds && call_hook(reload_check, (zonelist)) == 0) {
check_expires();
return 1; /* nothing to reload */
}
if (do_fork) {
int pfd[2];
if (flog && !flushlog)
fflush(flog);
/* forking reload. if anything fails, just do a non-forking one */
if (pipe(pfd) < 0)
do_fork = 0;
else if ((cpid = fork()) < 0) { /* fork failed, close the pipe */
close(pfd[0]);
close(pfd[1]);
do_fork = 0;
}
else if (!cpid) { /* child, continue answering queries */
signal(SIGALRM, SIG_IGN);
signal(SIGHUP, SIG_IGN);
#ifndef NO_STATS
signal(SIGUSR1, SIG_IGN);
signal(SIGUSR2, SIG_IGN);
#endif
close(pfd[0]);
/* set up the fd#1 to write stats later on SIGTERM */
if (pfd[1] != 1) {
dup2(pfd[1], 1);
close(pfd[1]);
}
fork_on_reload = -1;
return 1;
}
else {
close(pfd[1]);
cfd = pfd[0];
}
}
#ifndef NO_TIMES
#ifndef HZ
if (!HZ)
HZ = sysconf(_SC_CLK_TCK);
#endif
etm = times(&tms);
utm = tms.tms_utime;
#endif /* NO_TIMES */
r = 1;
while(ds) {
if (!loaddataset(ds))
r = 0;
ds = nextdataset2reload(ds);
}
for (zone = zonelist; zone; zone = zone->z_next) {
time_t stamp = 0;
time_t expires = 0;
const struct dssoa *dssoa = NULL;
const struct dsns *dsns = NULL;
unsigned nsttl = 0;
struct dslist *dsl;
for(dsl = zone->z_dsl; dsl; dsl = dsl->dsl_next) {
const struct dataset *ds = dsl->dsl_ds;
if (!ds->ds_stamp) {
stamp = 0;
break;
}
if (stamp < ds->ds_stamp)
stamp = ds->ds_stamp;
if (ds->ds_expires && (!expires || expires > ds->ds_expires))
expires = ds->ds_expires;
if (!dssoa)
dssoa = ds->ds_dssoa;
if (!dsns)
dsns = ds->ds_dsns, nsttl = ds->ds_nsttl;
}
zone->z_expires = expires;
zone->z_stamp = stamp;
if (!stamp) {
zlog(LOG_WARNING, zone,
"not all datasets are loaded, zone will not be serviced");
r = 0;
}
else if (!update_zone_soa(zone, dssoa) ||
!update_zone_ns(zone, dsns, nsttl, zonelist))
zlog(LOG_WARNING, zone,
"NS or SOA RRs are too long, will be ignored");
}
if (call_hook(reload, (zonelist)) != 0)
r = 0;
ip = ssprintf(ibuf, sizeof(ibuf), "zones reloaded");
#ifndef NO_TIMES
etm = times(&tms) - etm;
utm = tms.tms_utime - utm;
# define sec(tm) (unsigned long)(tm/HZ), (unsigned long)((tm*100/HZ)%100)
ip += ssprintf(ibuf + ip, sizeof(ibuf) - ip,
", time %lu.%lue/%lu.%luu sec", sec(etm), sec(utm));
# undef sec
#endif /* NO_TIMES */
#ifndef NO_MEMINFO
{
struct mallinfo mi = mallinfo();
# define kb(x) ((mi.x + 512)>>10)
ip += ssprintf(ibuf + ip, sizeof(ibuf) - ip,
", mem arena=%d free=%d mmap=%d Kb",
kb(arena), kb(fordblks), kb(hblkhd));
# undef kb
}
#endif /* NO_MEMINFO */
dslog(LOG_INFO, 0, ibuf);
check_expires();
/* ok, (something) loaded. */
if (do_fork) {
/* here we should notify query-answering child (send SIGTERM to it),
* and wait for it to complete.
* Unfortunately at least on linux, the SIGTERM sometimes gets ignored
* by the child process, so we're trying several times here, in a loop.
*/
int s, n;
fd_set fds;
struct timeval tv;
for(n = 1; ++n;) {
if (kill(cpid, SIGTERM) != 0)
dslog(LOG_WARNING, 0, "kill(qchild): %s", strerror(errno));
FD_ZERO(&fds);
FD_SET(cfd, &fds);
tv.tv_sec = 0;
tv.tv_usec = 500000;
s = select(cfd+1, &fds, NULL, NULL, &tv);
if (s > 0) break;
dslog(LOG_WARNING, 0, "waiting for qchild process: %s, retrying",
s ? strerror(errno) : "timeout");
}
ipc_read_stats(cfd);
close(cfd);
wait(&s);
}
return r;
}
static void do_signalled(void) {
sigprocmask(SIG_SETMASK, &ssblock, NULL);
if (signalled & SIGNALLED_TERM) {