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, "$CACHESIZE not set");
scan_ulong (x, &cachesize);
if (!cache_init (cachesize))
err (-1, "could not allocate `%ld' bytes for cache", cachesize);
if (env_get ("HIDETTL"))
response_hidettl ();
if (env_get ("FORWARDONLY"))
query_forwardonly ();
if (env_get ("MERGEQUERIES"))
dns_enable_merge (log_merge);
if (!roots_init ())
err (-1, "could not read servers");
if (debug_level > 3)
roots_display();
if (socket_listen (tcp53, 20) == -1)
err (-1, "could not listen on TCP socket");
if (!dbl_init() && debug_level > 1)
warnx ("could not read dnsbl.cdb");
doit ();
return 0;
}
int main()
{
char *x;
unsigned int i, j, k;
unsigned long cachesize;
static stralloc sa = {0};
x = env_get("INTERFACE");
if (x) scan_ulong(x,&interface);
x = env_get("IP");
if (!x)
strerr_die2x(111,FATAL,"$IP not set");
if (!ip6_scan(x,myipincoming))
strerr_die3x(111,FATAL,"unable to parse IP address ",x);
#if 0
/* if if IP is a mapped-IPv4 address, disable IPv6 functionality */
/* this is actually a bad idea */
if (ip6_isv4mapped(myipincoming))
noipv6 = 1;
#endif
udp53 = socket_udp6();
if (udp53 == -1)
strerr_die2sys(111,FATAL,"unable to create UDP socket: ");
if (socket_bind6_reuse(udp53,myipincoming,53,interface) == -1)
strerr_die2sys(111,FATAL,"unable to bind UDP socket: ");
tcp53 = socket_tcp6();
if (tcp53 == -1)
strerr_die2sys(111,FATAL,"unable to create TCP socket: ");
if (socket_bind6_reuse(tcp53,myipincoming,53,interface) == -1)
strerr_die2sys(111,FATAL,"unable to bind TCP socket: ");
droproot(FATAL);
socket_tryreservein(udp53,131072);
byte_zero(seed,sizeof seed);
read(0,seed,sizeof seed);
dns_random_init(seed);
close(0);
x = env_get("IPSEND");
if (!x)
strerr_die2x(111,FATAL,"$IPSEND not set");
if (!ip6_scan(x,myipoutgoing))
strerr_die3x(111,FATAL,"unable to parse IP address ",x);
x = env_get("CACHESIZE");
if (!x)
strerr_die2x(111,FATAL,"$CACHESIZE not set");
scan_ulong(x,&cachesize);
if (!cache_init(cachesize))
strerr_die3x(111,FATAL,"not enough memory for cache of size ",x);
if (openreadclose("ignoreip",&sa,64) < 0)
strerr_die2x(111,FATAL,"trouble reading ignoreip");
for(j = k = i = 0; i < sa.len; i++)
if (sa.s[i] == '\n') {
sa.s[i] = '\0';
if (!stralloc_readyplus(&ignoreip,16))
strerr_die2x(111,FATAL,"out of memory parsing ignoreip");
if (!ip6_scan(sa.s+k,ignoreip.s+j))
strerr_die3x(111,FATAL,"unable to parse address in ignoreip ",ignoreip.s+k);
j += 16;
k = i + 1;
}
ignoreip.len = j;
if (env_get("HIDETTL"))
response_hidettl();
if (env_get("FORWARDONLY"))
query_forwardonly();
if (!roots_init())
strerr_die2sys(111,FATAL,"unable to read servers: ");
if (socket_listen(tcp53,20) == -1)
strerr_die2sys(111,FATAL,"unable to listen on TCP socket: ");
log_startup();
doit();
}
