void local_actor::reply_message(any_tuple&& what) {
auto& whom = last_sender();
if (whom == nullptr) {
return;
}
auto id = m_current_node->mid;
if (id.valid() == false || id.is_response()) {
send_message(whom.get(), std::move(what));
}
else if (chaining_enabled()) {
if (whom->chained_sync_enqueue(this, id.response_id(), std::move(what))) {
m_chained_actor = whom;
}
}
else whom->sync_enqueue(this, id.response_id(), std::move(what));
}
message_id local_actor::sync_send_tuple_impl(message_priority mp,
const actor& dest,
any_tuple&& what) {
auto nri = new_request_id();
if (mp == message_priority::high) nri = nri.with_high_priority();
dest->enqueue({address(), dest, nri}, std::move(what));
return nri.response_id();
}
message_id sync_send_impl(message_priority mp, const Handle& dh, Ts&&... xs) {
if (! dh) {
throw std::invalid_argument("cannot sync_send to invalid_actor");
}
auto req_id = new_request_id(mp);
send_impl(req_id, actor_cast<abstract_channel*>(dh),
std::forward<Ts>(xs)...);
return req_id.response_id();
}
void u_respond(int j)
{
if (!u[j].active) return;
response_id(u[j].id);
if (response_len > 512) response_tc();
socket_send6(udp53,response,response_len,u[j].ip,u[j].port,u[j].scope_id);
log_querydone(&u[j].active,response_len);
u[j].active = 0; --uactive;
}
message_id local_actor::sync_send_tuple_impl(message_priority mp,
const actor& dest,
any_tuple&& what) {
if (!dest) {
throw std::invalid_argument("cannot send synchronous message "
"to invalid_actor");
}
auto nri = new_request_id();
if (mp == message_priority::high) nri = nri.with_high_priority();
dest->enqueue({address(), dest, nri}, std::move(what), m_host);
return nri.response_id();
}
static int doit(void)
{
unsigned int pos;
char header[12];
char qtype[2];
char qclass[2];
if (len >= sizeof buf) goto NOQ;
pos = dns_packet_copy(buf,len,0,header,12); if (!pos) goto NOQ;
if (header[2] & 128) goto NOQ;
if (header[4]) goto NOQ;
if (header[5] != 1) goto NOQ;
pos = dns_packet_getname(buf,len,pos,&q); if (!pos) goto NOQ;
pos = dns_packet_copy(buf,len,pos,qtype,2); if (!pos) goto NOQ;
pos = dns_packet_copy(buf,len,pos,qclass,2); if (!pos) goto NOQ;
if (!response_query(q,qtype,qclass)) goto NOQ;
response_id(header);
if (byte_equal(qclass,2,DNS_C_IN))
response[2] |= 4;
else
if (byte_diff(qclass,2,DNS_C_ANY)) goto WEIRDCLASS;
response[3] &= ~128;
if (!(header[2] & 1)) response[2] &= ~1;
if (header[2] & 126) goto NOTIMP;
if (byte_equal(qtype,2,DNS_T_AXFR)) goto NOTIMP;
case_lowerb(q,dns_domain_length(q));
if (!respond(q,qtype,ip)) {
qlog(ip,port,header,q,qtype," - ");
return 0;
}
qlog(ip,port,header,q,qtype," + ");
return 1;
NOTIMP:
response[3] &= ~15;
response[3] |= 4;
qlog(ip,port,header,q,qtype," I ");
return 1;
WEIRDCLASS:
response[3] &= ~15;
response[3] |= 1;
qlog(ip,port,header,q,qtype," C ");
return 1;
NOQ:
qlog(ip,port,"\0\0","","\0\0"," / ");
return 0;
}
/**
* @brief Sends @p what as a synchronous message to @p whom.
* @param whom Receiver of the message.
* @param what Message content as tuple.
* @returns A handle identifying a future to the response of @p whom.
* @warning The returned handle is actor specific and the response to the sent
* message cannot be received by another actor.
* @throws std::invalid_argument if <tt>whom == nullptr</tt>
*/
inline message_future sync_send_tuple(actor_ptr whom, any_tuple what) {
if (!whom) throw std::invalid_argument("whom == nullptr");
auto req = self->new_request_id();
message_header hdr{self, std::move(whom), req};
if (self->chaining_enabled()) {
if (hdr.receiver->chained_enqueue(hdr, std::move(what))) {
self->chained_actor(hdr.receiver.downcast<actor>());
}
}
else hdr.deliver(std::move(what));
return req.response_id();
}
message_id local_actor::timed_sync_send_tuple_impl(message_priority mp,
const actor& dest,
const util::duration& rtime,
any_tuple&& what) {
auto nri = new_request_id();
if (mp == message_priority::high) nri = nri.with_high_priority();
dest->enqueue({address(), dest, nri}, std::move(what));
auto rri = nri.response_id();
get_scheduler()->delayed_send({address(), this, rri}, rtime,
make_any_tuple(sync_timeout_msg{}));
return rri;
}
void t_respond(int j)
{
if (!t[j].active) return;
log_querydone(&t[j].active,response_len);
response_id(t[j].id);
t[j].len = response_len + 2;
t_free(j);
t[j].buf = alloc(response_len + 2);
if (!t[j].buf) { t_close(j); return; }
uint16_pack_big(t[j].buf,response_len);
byte_copy(t[j].buf + 2,response_len,response);
t[j].pos = 0;
t[j].state = -1;
}
message_id local_actor::timed_sync_send_tuple_impl(message_priority mp,
const actor& dest,
const util::duration& rtime,
any_tuple&& what) {
if (!dest) {
throw std::invalid_argument("cannot send synchronous message "
"to invalid_actor");
}
auto nri = new_request_id();
if (mp == message_priority::high) nri = nri.with_high_priority();
dest->enqueue({address(), dest, nri}, std::move(what), m_host);
auto rri = nri.response_id();
get_scheduling_coordinator()->delayed_send({address(), this, rri}, rtime,
make_any_tuple(sync_timeout_msg{}));
return rri;
}
void
u_respond (int j)
{
if (!u[j].active)
return;
response_id (u[j].id);
if (response_len > 512)
response_tc ();
socket_send4 (udp53, response, response_len, u[j].ip, u[j].port, &odst);
if (debug_level)
log_querydone (u[j].active, response, response_len);
u[j].active = 0;
--uactive;
}
message_id local_actor::timed_sync_send_tuple_impl(message_priority mp,
const actor& dest,
const duration& rtime,
message&& what) {
if (!dest) {
throw std::invalid_argument(
"cannot send synchronous message "
"to invalid_actor");
}
auto nri = new_request_id();
if (mp == message_priority::high) {
nri = nri.with_high_priority();
}
dest->enqueue(address(), nri, std::move(what), host());
auto rri = nri.response_id();
auto sched_cd = detail::singletons::get_scheduling_coordinator();
sched_cd->delayed_send(rtime, address(), this, rri,
make_message(sync_timeout_msg{}));
return rri;
}
// returns 0 if last_dequeued() is an asynchronous or sync request message,
// a response id generated from the request id otherwise
inline message_id get_response_id() const {
auto mid = current_element_->mid;
return (mid.is_request()) ? mid.response_id() : message_id();
}
int main()
{
unsigned int pos;
char header[12];
char qtype[2];
char qclass[2];
const char *x;
droproot(FATAL);
dns_random_init(seed);
axfr = env_get("AXFR");
x = env_get("TCPREMOTEIP");
if (x && ip6_scan(x,ip))
;
else
byte_zero(ip,16);
x = env_get("TCPREMOTEPORT");
if (!x) x = "0";
scan_ulong(x,&port);
for (;;) {
netread(tcpheader,2);
uint16_unpack_big(tcpheader,&len);
if (len > 512) strerr_die2x(111,FATAL,"excessively large request");
netread(buf,len);
pos = dns_packet_copy(buf,len,0,header,12); if (!pos) die_truncated();
if (header[2] & 254) strerr_die2x(111,FATAL,"bogus query");
if (header[4] || (header[5] != 1)) strerr_die2x(111,FATAL,"bogus query");
pos = dns_packet_getname(buf,len,pos,&zone); if (!pos) die_truncated();
zonelen = dns_domain_length(zone);
pos = dns_packet_copy(buf,len,pos,qtype,2); if (!pos) die_truncated();
pos = dns_packet_copy(buf,len,pos,qclass,2); if (!pos) die_truncated();
if (byte_diff(qclass,2,DNS_C_IN) && byte_diff(qclass,2,DNS_C_ANY))
strerr_die2x(111,FATAL,"bogus query: bad class");
pos = check_edns0(header, buf, len, pos);
if (!pos) die_truncated();
qlog(ip,port,header,zone,qtype," ");
if (byte_equal(qtype,2,DNS_T_AXFR)) {
case_lowerb(zone,zonelen);
fdcdb = open_read("data.cdb");
if (fdcdb == -1) die_cdbread();
doaxfr(header);
close(fdcdb);
}
else {
if (!response_query(zone,qtype,qclass)) nomem();
response[2] |= 4;
case_lowerb(zone,zonelen);
response_id(header);
response[3] &= ~128;
if (!(header[2] & 1)) response[2] &= ~1;
if (!respond(zone,qtype,ip)) die_outside();
print(response,response_len);
}
}
}
inline message_id new_request_id() {
auto result = ++m_last_request_id;
m_pending_responses.push_back(result.response_id());
return result;
}
inline message_id local_actor::get_response_id() {
auto id = m_current_node->mid;
return (id.is_request()) ? id.response_id() : message_id();
}
int
main (int argc, char *argv[])
{
int n = 0;
time_t t = 0;
struct sigaction sa;
char qtype[2];
char qclass[2];
char header[12];
const char *x = NULL;
unsigned int pos = 0;
unsigned long long qnum = 0;
sa.sa_handler = handle_term;
sigaction (SIGINT, &sa, NULL);
sigaction (SIGTERM, &sa, NULL);
sa.sa_handler = SIG_IGN;
sigaction (SIGPIPE, &sa, NULL);
prog = strdup ((x = strrchr (argv[0], '/')) != NULL ? x + 1 : argv[0]);
n = check_option (argc, argv);
argc -= n;
argv += n;
if (mode & DAEMON)
/* redirect stderr to a log file */
redirect_to_log (logfile, STDERR_FILENO);
time (&t);
memset (seed, 0, sizeof (seed));
strftime (seed, sizeof (seed), "%b-%d %Y %T %Z", localtime (&t));
warnx ("version %s: starting %s\n", VERSION, seed);
set_timezone ();
if (debug_level)
warnx ("TIMEZONE: %s", env_get ("TZ"));
read_conf (cfgfile);
if (!debug_level)
if ((x = env_get ("DEBUG_LEVEL")))
debug_level = atol (x);
warnx ("DEBUG_LEVEL set to `%d'", debug_level);
dns_random_init (seed);
axfr = env_get ("AXFR");
if (debug_level)
warnx ("AXFR set to `%s'", axfr);
x = env_get ("TCPREMOTEIP");
if (debug_level)
warnx ("TCPREMOTEIP set to `%s'", x);
if (x)
ip4_scan (x, ip);
else
byte_zero (ip, 4);
x = env_get ("TCPREMOTEPORT");
if (debug_level)
warnx ("TCPREMOTEPORT set to `%s'", x);
if (!x)
x = "0";
scan_ulong (x, &port);
droproot ();
for (;;)
{
netread (tcpheader, 2);
uint16_unpack_big (tcpheader, &len);
if (len > 512)
errx (-1, "excessively large request");
netread (buf, len);
pos = dns_packet_copy (buf, len, 0, header, 12);
if (!pos)
errx (-1, "truncated request");
if (header[2] & 254)
errx (-1, "bogus query");
if (header[4] || (header[5] != 1))
errx (-1, "bogus query");
pos = dns_packet_getname (buf, len, pos, &zone);
if (!pos)
errx (-1, "truncated request");
zonelen = dns_domain_length (zone);
pos = dns_packet_copy (buf, len, pos, qtype, 2);
if (!pos)
errx (-1, "truncated request");
pos = dns_packet_copy (buf, len, pos, qclass, 2);
if (!pos)
errx (-1, "truncated request");
if (byte_diff(qclass, 2, DNS_C_IN) && byte_diff(qclass, 2, DNS_C_ANY))
errx (-1, "bogus query: bad class");
log_query (++qnum, ip, port, header, zone, qtype);
if (byte_equal(qtype,2,DNS_T_AXFR))
{
case_lowerb (zone, zonelen);
fdcdb = open_read ("data.cdb");
if (fdcdb == -1)
errx (-1, "could not read from file `data.cdb'");
doaxfr (header);
close (fdcdb);
}
else
{
if (!response_query (zone, qtype, qclass))
err (-1, "could not allocate enough memory");
response[2] |= 4;
case_lowerb (zone, zonelen);
response_id (header);
response[3] &= ~128;
if (!(header[2] & 1))
response[2] &= ~1;
if (!respond (zone, qtype, ip))
errx (-1, "could not find information in file `data.cdb'");
print (response, response_len);
}
}
}