-int tap_fd = -1;
-int taptype = 0;
-int total_tap_in = 0;
-int total_tap_out = 0;
-int total_socket_in = 0;
-int total_socket_out = 0;
-
-int upstreamindex = 0;
-static int seconds_till_retry;
-
-char *unknown = NULL;
-
-/*
- strip off the MAC adresses of an ethernet frame
-*/
-void strip_mac_addresses(vpn_packet_t *p)
-{
-cp
- memmove(p->data, p->data + 12, p->len -= 12);
-cp
-}
-
-/*
- reassemble MAC addresses
-*/
-void add_mac_addresses(vpn_packet_t *p)
-{
-cp
- memcpy(p->data + 12, p->data, p->len);
- p->len += 12;
- p->data[0] = p->data[6] = 0xfe;
- p->data[1] = p->data[7] = 0xfd;
- /* Really evil pointer stuff just below! */
- *((ip_t*)(&p->data[2])) = (ip_t)(htonl(myself->address));
- *((ip_t*)(&p->data[8])) = *((ip_t*)(&p->data[26]));
-cp
-}
-
-int xsend(conn_list_t *cl, vpn_packet_t *inpkt)
-{
- vpn_packet_t outpkt;
- int outlen, outpad;
-cp
- outpkt.len = inpkt->len;
- EVP_EncryptInit(cl->cipher_pktctx, cl->cipher_pkttype, cl->cipher_pktkey, NULL);
- EVP_EncryptUpdate(cl->cipher_pktctx, outpkt.data, &outlen, inpkt->data, inpkt->len);
- EVP_EncryptFinal(cl->cipher_pktctx, outpkt.data + outlen, &outpad);
- outlen += outpad;
-
- if(debug_lvl > 3)
- syslog(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"),
- outlen, cl->name, cl->hostname);
-
- total_socket_out += outlen;
-
- cl->want_ping = 1;
-
- if((send(cl->socket, (char *) &(outpkt.len), outlen + 2, 0)) < 0)
- {
- syslog(LOG_ERR, _("Error sending packet to %s (%s): %m"),
- cl->name, cl->hostname);
- return -1;
- }
-cp
- return 0;
-}
-
-int xrecv(vpn_packet_t *inpkt)
-{
- vpn_packet_t outpkt;
- int outlen, outpad;
-cp
- if(debug_lvl > 3)
- syslog(LOG_ERR, _("Receiving packet of %d bytes"),
- inpkt->len);
-
- outpkt.len = inpkt->len;
- EVP_DecryptInit(myself->cipher_pktctx, myself->cipher_pkttype, myself->cipher_pktkey, NULL);
- EVP_DecryptUpdate(myself->cipher_pktctx, outpkt.data, &outlen, inpkt->data, inpkt->len);
- /* FIXME: grok DecryptFinal
- EVP_DecryptFinal(myself->cipher_pktctx, outpkt.data + outlen, &outpad);
- */
-
- add_mac_addresses(&outpkt);
-
- if(write(tap_fd, outpkt.data, outpkt.len) < 0)
- syslog(LOG_ERR, _("Can't write to tap device: %m"));
- else
- total_tap_out += outpkt.len;
-cp
- return 0;
-}
-
-/*
- add the given packet of size s to the
- queue q, be it the send or receive queue
-*/
-void add_queue(packet_queue_t **q, void *packet, size_t s)
-{
- queue_element_t *e;
-cp
- e = xmalloc(sizeof(*e));
- e->packet = xmalloc(s);
- memcpy(e->packet, packet, s);
-
- if(!*q)
- {
- *q = xmalloc(sizeof(**q));
- (*q)->head = (*q)->tail = NULL;
- }
-
- e->next = NULL; /* We insert at the tail */
-
- if((*q)->tail) /* Do we have a tail? */
- {
- (*q)->tail->next = e;
- e->prev = (*q)->tail;
- }
- else /* No tail -> no head too */
- {
- (*q)->head = e;
- e->prev = NULL;
- }
-
- (*q)->tail = e;
-cp
-}
-
-/* Remove a queue element */
-void del_queue(packet_queue_t **q, queue_element_t *e)
-{
-cp
- free(e->packet);
-
- if(e->next) /* There is a successor, so we are not tail */
- {
- if(e->prev) /* There is a predecessor, so we are not head */
- {
- e->next->prev = e->prev;
- e->prev->next = e->next;
- }
- else /* We are head */
- {
- e->next->prev = NULL;
- (*q)->head = e->next;
- }
- }
- else /* We are tail (or all alone!) */
- {
- if(e->prev) /* We are not alone :) */
- {
- e->prev->next = NULL;
- (*q)->tail = e->prev;
- }
- else /* Adieu */
- {
- free(*q);
- *q = NULL;
- }
- }
-
- free(e);
-cp
-}