freewtp/src/wtp/wtp_dfa_dtls.c

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#include "wtp.h"
#include "capwap_dfa.h"
#include "wtp_dfa.h"
/* */
static void wtp_dfa_state_dtlsconnect_timeout(struct capwap_timeout* timeout, unsigned long index, void* context, void* param) {
wtp_teardown_connection();
}
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/* */
void wtp_start_dtlssetup(void) {
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/* Create DTLS session */
if (!capwap_crypt_createsession(&g_wtp.dtls, &g_wtp.dtlscontext)) {
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wtp_dfa_change_state(CAPWAP_SULKING_STATE);
capwap_timeout_set(g_wtp.timeout, g_wtp.idtimercontrol, WTP_SILENT_INTERVAL, wtp_dfa_state_sulking_timeout, NULL, NULL);
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} else {
if (capwap_crypt_open(&g_wtp.dtls) == CAPWAP_HANDSHAKE_ERROR) {
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wtp_dfa_change_state(CAPWAP_SULKING_STATE);
capwap_timeout_set(g_wtp.timeout, g_wtp.idtimercontrol, WTP_SILENT_INTERVAL, wtp_dfa_state_sulking_timeout, NULL, NULL);
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} else {
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wtp_dfa_change_state(CAPWAP_DTLS_CONNECT_STATE);
capwap_timeout_set(g_wtp.timeout, g_wtp.idtimercontrol, WTP_DTLS_INTERVAL, wtp_dfa_state_dtlsconnect_timeout, NULL, NULL);
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}
}
}
/* */
void wtp_start_datachannel(void) {
union sockaddr_capwap dataaddr;
/* Set AC data address */
memcpy(&dataaddr, &g_wtp.dtls.peeraddr, sizeof(union sockaddr_capwap));
CAPWAP_SET_NETWORK_PORT(&dataaddr, (CAPWAP_GET_NETWORK_PORT(&g_wtp.dtls.peeraddr) + 1));
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#ifdef DEBUG
{
char addr[INET6_ADDRSTRLEN];
capwap_logging_debug("Create data channel with peer %s:%d", capwap_address_to_string(&dataaddr, addr, INET6_ADDRSTRLEN), (int)CAPWAP_GET_NETWORK_PORT(&dataaddr));
}
#endif
/* Bind data address and Connect to AC data channel */
if (wtp_kmod_create(g_wtp.net.localaddr.ss.ss_family, &dataaddr.ss, &g_wtp.sessionid, g_wtp.mtu) == 0) {
capwap_logging_error("Data channel connected");
/* Reset AC Prefered List Position */
g_wtp.acpreferedselected = 0;
/* Set timer */
wtp_dfa_change_state(CAPWAP_RUN_STATE);
capwap_timeout_unset(g_wtp.timeout, g_wtp.idtimercontrol);
capwap_timeout_set(g_wtp.timeout, g_wtp.idtimerecho, g_wtp.echointerval, wtp_dfa_state_run_echo_timeout, NULL, NULL);
capwap_timeout_set(g_wtp.timeout, g_wtp.idtimerkeepalivedead, WTP_DATACHANNEL_KEEPALIVEDEAD, wtp_dfa_state_run_keepalivedead_timeout, NULL, NULL);
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} else {
/* Error to send packets */
capwap_logging_error("Error to send data channel keepalive packet");
wtp_teardown_connection();
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}
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}
/* */
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static void wtp_dfa_state_dtlsteardown_timeout(struct capwap_timeout* timeout,
unsigned long index, void* context, void* param)
{
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/* Free and reset resource */
if (g_wtp.dtls.enable)
capwap_crypt_freesession(&g_wtp.dtls);
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/* */
if (g_wtp.acname.name) {
capwap_free(g_wtp.acname.name);
g_wtp.acname.name = NULL;
}
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/* */
wtp_free_reference_last_request();
wtp_free_reference_last_response();
wtp_free_packet_rxmng();
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/* */
if (!g_wtp.running) {
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wtp_dfa_change_state(CAPWAP_DEAD_STATE);
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} else if ((g_wtp.faileddtlssessioncount >= WTP_FAILED_DTLS_SESSION_RETRY) ||
(g_wtp.faileddtlsauthfailcount >= WTP_FAILED_DTLS_SESSION_RETRY)) {
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wtp_dfa_change_state(CAPWAP_SULKING_STATE);
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capwap_timeout_set(g_wtp.timeout, g_wtp.idtimercontrol, WTP_SILENT_INTERVAL,
wtp_dfa_state_sulking_timeout, NULL, NULL);
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} else {
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wtp_dfa_change_state(CAPWAP_IDLE_STATE);
wtp_dfa_state_idle();
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}
}
/* */
void wtp_dfa_state_dtlsteardown(struct capwap_parsed_packet* packet) {
}
/* Teardown connection */
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void wtp_teardown_connection(void)
{
g_wtp.teardown = 1;
/* TODO: close SSID ? */
/* DTSL Control */
if (g_wtp.dtls.enable)
capwap_crypt_close(&g_wtp.dtls);
/* Close data channel session */
wtp_kmod_resetsession();
/* */
wtp_dfa_change_state(CAPWAP_DTLS_TEARDOWN_STATE);
capwap_timeout_unsetall(g_wtp.timeout);
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capwap_timeout_set(g_wtp.timeout, g_wtp.idtimercontrol, WTP_DTLS_SESSION_DELETE,
wtp_dfa_state_dtlsteardown_timeout, NULL, NULL);
}