void
initialize (void)
{
cfgfile = cfgfile ? cfgfile : CFGFILE;
logfile = logfile ? logfile : LOGFILE;
pidfile = pidfile ? pidfile : PIDFILE;
read_conf (cfgfile);
if (mode & DAEMON)
{
/* redirect stdout & stderr to a log file */
redirect_to_log (logfile, STDOUT_FILENO | STDERR_FILENO);
write_pid (pidfile);
}
dns_random_init (seed);
}
int
main (int argc, char *argv[])
{
int i = 0;
time_t t = 0;
struct sigaction sa;
unsigned long cachesize = 0;
char *x = NULL, char_seed[128];
sa.sa_handler = handle_term;
sigaction (SIGINT, &sa, NULL);
sigaction (SIGTERM, &sa, NULL);
sa.sa_handler = SIG_IGN;
sigaction (SIGPIPE, &sa, NULL);
seed_addtime ();
seed_adduint32 (getpid ());
seed_adduint32 (getppid ());
seed_adduint32 (getuid ());
seed_adduint32 (getgid ());
seed_addtime ();
prog = strdup ((x = strrchr (argv[0], '/')) != NULL ? x + 1 : argv[0]);
i = check_option (argc, argv);
argc -= i;
argv += i;
if (mode & DAEMON)
{
i = fork ();
if (i == -1)
err (-1, "could not fork a daemon process");
if (i > 0)
return 0;
}
time (&t);
strftime (char_seed, sizeof (char_seed), "%b-%d %Y %T %Z", localtime (&t));
warnx ("version %s: starting: %s\n", VERSION, char_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);
if ((x = env_get ("DATALIMIT")))
{
struct rlimit r;
unsigned long dlimit = atol (x);
if (getrlimit (RLIMIT_DATA, &r) != 0)
err (-1, "could not get resource RLIMIT_DATA");
r.rlim_cur = (dlimit <= r.rlim_max) ? dlimit : r.rlim_max;
if (setrlimit (RLIMIT_DATA, &r) != 0)
err (-1, "could not set resource RLIMIT_DATA");
if (debug_level)
warnx ("DATALIMIT set to `%ld' bytes", r.rlim_cur);
}
if (!(x = env_get ("IP")))
err (-1, "$IP not set");
if (!ip4_scan (x, myipincoming))
err (-1, "could not parse IP address `%s'", x);
seed_addtime ();
udp53 = socket_udp ();
if (udp53 == -1)
err (-1, "could not open UDP socket");
if (socket_bind4_reuse (udp53, myipincoming, 53) == -1)
err (-1, "could not bind UDP socket");
seed_addtime ();
tcp53 = socket_tcp ();
if (tcp53 == -1)
err (-1, "could not open TCP socket");
if (socket_bind4_reuse (tcp53, myipincoming, 53) == -1)
err (-1, "could not bind TCP socket");
if (mode & DAEMON)
{
/* redirect stdout & stderr to a log file */
redirect_to_log (LOGFILE, STDOUT_FILENO | STDERR_FILENO);
write_pid (PIDFILE);
}
seed_addtime ();
droproot ();
if (mode & DAEMON)
/* crerate a new session & detach from controlling tty */
if (setsid () < 0)
err (-1, "could not start a new session for the daemon");
seed_addtime ();
socket_tryreservein (udp53, 131072);
memset (char_seed, 0, sizeof (char_seed));
for (i = 0, x = (char *)seed; (unsigned)i < sizeof (char_seed); i++, x++)
char_seed[i] = *x;
dns_random_init (char_seed);
if (!(x = env_get ("IPSEND")))
err (-1, "$IPSEND not set");
if (!ip4_scan (x, myipoutgoing))
err (-1, "could not parse IP address `%s'", x);
if (!(x = env_get ("CACHESIZE")))
err (-1, "$CACHESIZE not set");
scan_ulong (x, &cachesize);
if (!cache_init (cachesize))
err (-1, "could not allocate `%ld' bytes for cache", cachesize);
if (env_get ("HIDETTL"))
response_hidettl ();
if (env_get ("FORWARDONLY"))
query_forwardonly ();
if (env_get ("MERGEQUERIES"))
dns_enable_merge (log_merge);
if (!roots_init ())
err (-1, "could not read servers");
if (debug_level > 3)
roots_display();
if (socket_listen (tcp53, 20) == -1)
err (-1, "could not listen on TCP socket");
if (!dbl_init() && debug_level > 1)
warnx ("could not read dnsbl.cdb");
doit ();
return 0;
}
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);
}
}
}
