int pkb_check_frontend_dns(struct pk_manager* pkm)
{
int i, changes, have_nulls;
time_t obsolete;
struct pk_tunnel* fe;
char* last_fe_hostname;
PK_TRACE_FUNCTION;
/* Walk through frontend list, look each up in DNS and add new entries
* as necessary.
*/
changes = 0;
have_nulls = 0;
last_fe_hostname = "";
for (i = 0, fe = pkm->tunnels; i < pkm->tunnel_max; i++, fe++) {
if ((fe->fe_hostname != NULL) &&
(0 != strcmp(fe->fe_hostname, last_fe_hostname)))
{
pk_log(PK_LOG_MANAGER_DEBUG, "Checking for new IPs: %s", fe->fe_hostname);
changes += pkm_add_frontend(pkm, fe->fe_hostname, fe->fe_port, 0);
last_fe_hostname = fe->fe_hostname;
}
if ((fe->fe_hostname != NULL) && (fe->ai.ai_addr == NULL)) {
have_nulls += 1;
}
}
pk_log(PK_LOG_MANAGER_DEBUG, "Found %d new IPs", changes);
/* 2nd pass: walk through list and remove obsolete entries
* We only do this if we have null records which will let us re-discover
* everything again if DNS went away temporarily.
*/
if (have_nulls)
{
obsolete = time(0) - (pkm->check_world_interval * 4);
for (i = 0, fe = pkm->tunnels; i < pkm->tunnel_max; i++, fe++) {
if ((fe->fe_hostname != NULL) &&
(fe->ai.ai_addr != NULL) &&
(fe->last_configured < obsolete) &&
(fe->last_ping < obsolete) &&
(fe->conn.sockfd <= 0))
{
free(fe->fe_hostname);
free_addrinfo_data(&fe->ai);
fe->fe_hostname = NULL;
}
}
}
PK_CHECK_MEMORY_CANARIES;
return changes;
}
int main(int argc, char **argv) {
struct pk_manager *m;
unsigned int tmp_uint;
char* proto;
char* kitename;
char* secret;
int gotargs = 0;
int verbosity = 0;
int use_ipv4 = 1;
int fes_v4 = 0;
#ifdef HAVE_IPV6
int use_ipv6 = 1;
int fes_v6 = 0;
#endif
int use_current = 1;
int use_ssl = 1;
int use_evil = 0;
int use_watchdog = 0;
int max_conns = 25;
int spare_frontends = 0;
char* fe_hostname = NULL;
char* ddns_url = PAGEKITE_NET_DDNS;
int ac;
int pport;
int lport;
SSL_CTX* ssl_ctx;
/* FIXME: Is this too lame? */
srand(time(0) ^ getpid());
pks_global_init(PK_LOG_NORMAL);
while (-1 != (ac = getopt(argc, argv, "46c:B:CE:F:In:qRSvWZ"))) {
switch (ac) {
case '4':
use_ipv4 = 0;
break;
case '6':
#ifdef HAVE_IPV6
use_ipv6 = 0;
#endif
break;
case 'C':
use_current = 0;
break;
case 'v':
verbosity++;
break;
case 'q':
verbosity--;
break;
case 'I':
use_ssl = 0;
break;
case 'R':
pk_state.fake_ping = 1;
break;
case 'S':
ddns_url = NULL;
break;
case 'W':
use_watchdog = 1;
break;
case 'Z':
use_evil = 1;
break;
case 'F':
gotargs++;
fe_hostname = strdup(optarg);
break;
case 'B':
gotargs++;
if (1 == sscanf(optarg, "%u", &pk_state.bail_on_errors)) break;
usage(1);
case 'c':
gotargs++;
if (1 == sscanf(optarg, "%d", &max_conns)) break;
usage(1);
case 'E':
gotargs++;
if (1 == sscanf(optarg, "%u", &tmp_uint)) {
pk_state.conn_eviction_idle_s = tmp_uint;
break;
}
usage(1);
case 'n':
gotargs++;
if (1 == sscanf(optarg, "%d", &spare_frontends)) break;
usage(1);
default:
usage(1);
}
gotargs++;
}
if ((argc-1-gotargs) < 5 || ((argc-1-gotargs) % 5) != 0) usage(1);
signal(SIGUSR1, &raise_log_level);
pk_state.log_mask = ((verbosity < 0) ? PK_LOG_ERRORS :
((verbosity < 1) ? PK_LOG_NORMAL :
((verbosity < 2) ? PK_LOG_DEBUG : PK_LOG_ALL)));
if (use_ssl) {
PKS_SSL_INIT(ssl_ctx);
}
else {
ssl_ctx = NULL;
}
if (NULL == (m = pkm_manager_init(NULL, 0, NULL,
1 + (argc-1-gotargs)/5, /* Kites */
PAGEKITE_NET_FE_MAX,
max_conns, ddns_url, ssl_ctx))) {
pk_perror(argv[0]);
exit(1);
}
m->want_spare_frontends = spare_frontends;
if (use_evil) {
m->housekeeping_interval_min = 5;
m->housekeeping_interval_max = 20;
m->check_world_interval = 30;
}
if (use_watchdog)
m->enable_watchdog = 1;
for (ac = gotargs; ac+5 < argc; ac += 5) {
if ((1 != sscanf(argv[ac+1], "%d", &lport)) ||
(1 != sscanf(argv[ac+4], "%d", &pport))) {
usage(2);
}
proto = argv[ac+2];
kitename = argv[ac+3];
secret = argv[ac+5];
if ((NULL == (pkm_add_kite(m, proto, kitename, 0, secret,
"localhost", lport))) ||
(use_current &&
(0 > (pkm_add_frontend(m, kitename, pport, FE_STATUS_AUTO))))) {
pk_perror(argv[0]);
exit(3);
}
}
if (ddns_url != NULL) {
if (fe_hostname) {
if (0 > (fes_v4 = pkm_add_frontend(m, fe_hostname, 443, FE_STATUS_AUTO))) {
pk_perror(argv[0]);
exit(4);
}
}
else if (((use_ipv4) &&
(0 >= (fes_v4 = pkm_add_frontend(m, PAGEKITE_NET_V4FRONTENDS, FE_STATUS_AUTO))))
#ifdef HAVE_IPV6
|| ((use_ipv6) &&
(0 >= (fes_v6 = pkm_add_frontend(m, PAGEKITE_NET_V6FRONTENDS, FE_STATUS_AUTO))))
#endif
) {
pk_perror(argv[0]);
exit(4);
}
}
if (0 == (fes_v4 + fes_v6)) {
pk_error = ERR_NO_FRONTENDS;
pk_perror(argv[0]);
exit(4);
}
if (0 > pkm_run_in_thread(m)) {
pk_perror(argv[0]);
exit(5);
}
pkm_wait_thread(m);
return 0;
}