int cw_format_item(char *dst,mbag_item_t * item)
{
*dst=0;
if (item->type==MBAG_BSTR16){
strncpy(dst,(char*)bstr16_data(item->data),bstr16_len(item->data));
*(dst+bstr16_len(item->data))=0;
return bstr16_len(item->data);
}
return 0;
}
static int to_str(void *item,char *dst)
{
mbag_item_t *i= item;
char *d = dst;
int utf8 = format_is_utf8(bstr16_data(i->data), bstr16_len(i->data));
if (utf8) {
d += sprintf(d, "%.*s", bstr16_len(i->data), bstr16_data(i->data));
} else {
d += sprintf(d, ".x");
d += format_hex(d, bstr16_data(i->data), bstr16_len(i->data));
}
return d-dst;
}
/**
* Establish a DTLS connection using gnutls library
* @see #dtls_connec
*/
int dtls_gnutls_connect(struct conn *conn)
{
int rc;
char sock_buf[SOCK_ADDR_BUFSIZE];
struct dtls_gnutls_data *d;
gnutls_datum_t key;
d = dtls_gnutls_data_create(conn,
GNUTLS_CLIENT | GNUTLS_DATAGRAM | GNUTLS_NONBLOCK);
if (!d)
return 0;
/*// gnutls_dh_set_prime_bits(d->session, 512);*/
/*#if GNUTLS_VERSION_NUMBER >= 0x030100
gnutls_handshake_set_timeout(d->session, GNUTLS_DEFAULT_HANDSHAKE_TIMEOUT);
gnutls_dtls_set_data_mtu(d->session, 1500);
#endif
gnutls_dtls_set_mtu(d->session, 1500);
*/
/*
if (conn->dtls_psk != NULL){
key.data=(unsigned char*)conn->dtls_psk;
key.size=strlen(conn->dtls_psk);
rc = gnutls_credentials_set(d->session, GNUTLS_CRD_PSK, &key);
if (rc<0) {
cw_log(LOG_ERR, "DTLS - Can't set x.509 credentials: %s", gnutls_strerror(rc));
dtls_gnutls_data_destroy(d);
return 0;
}
}
*/
if (conn->dtls_psk_enable){
gnutls_psk_client_credentials_t cred;
rc = gnutls_psk_allocate_client_credentials(&cred);
if (rc != 0) {
cw_dbg(DBG_DTLS,"gnutls_psk_allocate_client_credentials() failed.\n");
return 0;
}
key.size = bstr16_len(conn->dtls_psk);
key.data = bstr16_data(conn->dtls_psk);
/* Put the username and key into the structure we use to tell GnuTLs what
// the credentials are. The example server doesn't care about usernames, so
// we use "Alice" here.*/
rc = gnutls_psk_set_client_credentials(cred, "Alice", &key, GNUTLS_PSK_KEY_RAW);
rc = gnutls_credentials_set(d->session, GNUTLS_CRD_PSK, cred);
if (rc != 0) {
cw_log(LOG_ERR,"gnutls_credentials_set() failed.");
}
}
cw_dbg(DBG_DTLS,"Starting handshake");
do {
rc = gnutls_handshake(d->session);
} while (rc == GNUTLS_E_AGAIN);
if (rc < 0) {
cw_log(LOG_ERR, "DTLS (gnutls) Can't connect to %s: %s",
sock_addr2str(&conn->addr,sock_buf), gnutls_strerror(rc));
return 0;
}
cw_dbg(DBG_DTLS, "Handshake with %s successful", sock_addr2str(&conn->addr,sock_buf));
conn->dtls_data = d;
conn->read = dtls_gnutls_read;
conn->write = dtls_gnutls_write;
return 1;
}
int put(struct mbag_item *i, uint8_t *dst)
{
int l = bstr16_len(i->data);
memcpy(dst,bstr16_data(i->data),l);
return l;
}
