-int send_key_answer(conn_list_t *cl, ip_t to)
-{
- conn_list_t *fw;
-cp
-
- fw = lookup_conn(to);
-
- if(!fw)
- {
- syslog(LOG_ERR, _("Attempting to send ANS_KEY to " IP_ADDR_S ", which does not exist?"),
- IP_ADDR_V(to));
- return -1;
- }
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Sending ANS_KEY to " IP_ADDR_S " (%s)"),
- IP_ADDR_V(fw->nexthop->vpn_ip), fw->nexthop->hostname);
-
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx %lx %d %s\n", ANS_KEY, to, myself->vpn_ip, my_key_expiry, my_public_key_base36);
-
- if((write(fw->nexthop->meta_socket, buffer, buflen)) < 0)
- {
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
- }
-cp
- return 0;
-}
-
-/*
- notify all my direct connections of a new host
- that was added to the vpn, with the exception
- of the source of the announcement.
-*/
-int notify_others(conn_list_t *new, conn_list_t *source,
- int (*function)(conn_list_t*, conn_list_t*))
-{
- conn_list_t *p;
-cp
- for(p = conn_list; p != NULL; p = p->next)
- if(p != new && p != source && p->status.meta && p->status.active)
- function(p, new);
-cp
- return 0;
-}
-
-/*
- notify one connection of everything
- i have connected
-*/
-int notify_one(conn_list_t *new)
-{
- conn_list_t *p;
-cp
- for(p = conn_list; p != NULL; p = p->next)
- if(p != new && p->status.active)
- send_add_host(new, p);
-cp
- return 0;
-}
-
-/*
- The incoming request handlers
-*/
-
-int basic_info_h(conn_list_t *cl)
-{
-cp
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got BASIC_INFO from %s"), cl->hostname);
-
- if(sscanf(cl->buffer, "%*d %d %lx/%lx:%hx %d", &cl->protocol_version, &cl->vpn_ip, &cl->vpn_mask, &cl->port, &cl->flags) != 5)
- {
- syslog(LOG_ERR, _("Got bad BASIC_INFO from " IP_ADDR_S),
- cl->hostname);
- return -1;
- }
-
- if(cl->protocol_version != PROT_CURRENT)
- {
- syslog(LOG_ERR, _("Peer uses incompatible protocol version %d"),
- cl->protocol_version);
- return -1;
- }
-
- if(cl->status.outgoing)
- {
- if(setup_vpn_connection(cl) < 0)
- return -1;
- send_basic_info(cl);
- }
- else
- {
- if(setup_vpn_connection(cl) < 0)
- return -1;
- send_passphrase(cl);
- }
-cp
- return 0;
-}
-
-int passphrase_h(conn_list_t *cl)
-{
-cp
- cl->pp = xmalloc(sizeof(*(cl->pp)));
-
- if(sscanf(cl->buffer, "%*d %as", &(cl->pp->phrase)) != 1)
- {
- syslog(LOG_ERR, _("Got bad PASSPHRASE from " IP_ADDR_S " (%s)"),
- IP_ADDR_V(cl->vpn_ip), cl->hostname);
- return -1;
- }
- cl->pp->len = strlen(cl->pp->phrase);
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got PASSPHRASE from " IP_ADDR_S " (%s)"),
- IP_ADDR_V(cl->vpn_ip), cl->hostname);
-
- if(cl->status.outgoing)
- send_passphrase(cl);
- else
- send_public_key(cl);
-cp
- return 0;
-}
-
-int public_key_h(conn_list_t *cl)
-{
- char *g_n;
- conn_list_t *old;
-cp
- if(sscanf(cl->buffer, "%*d %as", &g_n) != 1)
- {
- syslog(LOG_ERR, _("Got bad PUBLIC_KEY from " IP_ADDR_S " (%s)"),
- IP_ADDR_V(cl->vpn_ip), cl->hostname);
- return -1;
- }
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got PUBLIC_KEY from " IP_ADDR_S " (%s)"),
- IP_ADDR_V(cl->vpn_ip), cl->hostname);
-
- if(verify_passphrase(cl, g_n))
- {
- /* intruder! */
- syslog(LOG_ERR, _("Intruder: passphrase does not match!"));
- return -1;
- }
-
- if(cl->status.outgoing)
- send_public_key(cl);
- else
- {
- send_ack(cl);
-
- /* Okay, before we active the connection, we check if there is another entry
- in the connection list with the same vpn_ip. If so, it presumably is an
- old connection that has timed out but we don't know it yet. Because our
- conn_list entry is not active, lookup_conn will skip ourself. */
-
- while(old=lookup_conn(cl->vpn_ip))
- terminate_connection(old);
-
- cl->status.active = 1;
- notify_others(cl, NULL, send_add_host);
- notify_one(cl);
- }
-cp
- return 0;
-}
-
-int ack_h(conn_list_t *cl)
-{
-cp
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got ACK from " IP_ADDR_S " (%s)"),
- IP_ADDR_V(cl->vpn_ip), cl->hostname);
-
- cl->status.active = 1;
- syslog(LOG_NOTICE, _("Connection with " IP_ADDR_S " (%s) activated"),
- IP_ADDR_V(cl->vpn_ip), cl->hostname);
-cp
- return 0;
-}
-
-int termreq_h(conn_list_t *cl)
-{
-cp
- if(!cl->status.active)
- {
- syslog(LOG_ERR, _("Got unauthorized TERMREQ from " IP_ADDR_S " (%s)"),
- IP_ADDR_V(cl->vpn_ip), cl->hostname);
- return -1;
- }
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got TERMREQ from " IP_ADDR_S " (%s)"),
- IP_ADDR_V(cl->vpn_ip), cl->hostname);
-
- cl->status.termreq = 1;
- cl->status.active = 0;
-
- if(cl->status.active)
- notify_others(cl, NULL, send_del_host);
-
- terminate_connection(cl);
-cp
- return 0;
-}
-
-int timeout_h(conn_list_t *cl)
-{
-cp
- if(!cl->status.active)
- {
- syslog(LOG_ERR, _("Got unauthorized TIMEOUT from " IP_ADDR_S " (%s)"),
- IP_ADDR_V(cl->vpn_ip), cl->hostname);
- return -1;
- }
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got TIMEOUT from " IP_ADDR_S " (%s)"),
- IP_ADDR_V(cl->vpn_ip), cl->hostname);
-
- cl->status.termreq = 1;
- terminate_connection(cl);
-cp
- return 0;
-}
-
-int del_host_h(conn_list_t *cl)
-{
- ip_t vpn_ip;
- conn_list_t *fw;
-cp
- if(!cl->status.active)
- {
- syslog(LOG_ERR, _("Got unauthorized DEL_HOST from " IP_ADDR_S " (%s)"),
- IP_ADDR_V(cl->vpn_ip), cl->hostname);
- return -1;
- }
-
- if(sscanf(cl->buffer, "%*d %lx", &vpn_ip) != 1)
- {
- syslog(LOG_ERR, _("Got bad DEL_HOST from " IP_ADDR_S " (%s)"),
- IP_ADDR_V(cl->vpn_ip), cl->hostname);
- return -1;
- }
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got DEL_HOST for " IP_ADDR_S " from " IP_ADDR_S " (%s)"),
- IP_ADDR_V(vpn_ip), IP_ADDR_V(cl->vpn_ip), cl->hostname);
-
- if(!(fw = lookup_conn(vpn_ip)))
- {
- syslog(LOG_ERR, _("Got DEL_HOST for " IP_ADDR_S " from " IP_ADDR_S " (%s) which does not exist?"),
- IP_ADDR_V(vpn_ip), IP_ADDR_V(cl->vpn_ip), cl->hostname);
- return 0;
- }
-
- notify_others(cl, fw, send_del_host);
-
- fw->status.termreq = 1;
- terminate_connection(fw);
-cp
- return 0;
-}
-
-int ping_h(conn_list_t *cl)
-{
-cp
- if(!cl->status.active)
- {
- syslog(LOG_ERR, _("Got unauthorized PING from " IP_ADDR_S " (%s)"),
- IP_ADDR_V(cl->vpn_ip), cl->hostname);
- return -1;
- }
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got PING from " IP_ADDR_S " (%s)"),
- IP_ADDR_V(cl->vpn_ip), cl->hostname);
-
- cl->status.pinged = 0;
- cl->status.got_pong = 1;
-
- send_pong(cl);
-cp
- return 0;
-}
-
-int pong_h(conn_list_t *cl)
-{
-cp
- if(!cl->status.active)
- {
- syslog(LOG_ERR, _("Got unauthorized PONG from " IP_ADDR_S " (%s)"),
- IP_ADDR_V(cl->vpn_ip), cl->hostname);
- return -1;
- }
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got PONG from " IP_ADDR_S " (%s)"),
- IP_ADDR_V(cl->vpn_ip), cl->hostname);
-
- cl->status.got_pong = 1;
-cp
- return 0;
-}
-
-int add_host_h(conn_list_t *cl)
-{
- ip_t real_ip;
- ip_t vpn_ip;
- ip_t vpn_mask;
- unsigned short port;
- int flags;
- conn_list_t *ncn, *fw;
-cp
- if(!cl->status.active)
- {
- syslog(LOG_ERR, _("Got unauthorized ADD_HOST from " IP_ADDR_S " (%s)"),
- IP_ADDR_V(cl->vpn_ip), cl->hostname);
- return -1;
- }
-
- if(sscanf(cl->buffer, "%*d %lx %lx/%lx:%hx %d", &real_ip, &vpn_ip, &vpn_mask, &port, &flags) != 5)
- {
- syslog(LOG_ERR, _("Got bad ADD_HOST from " IP_ADDR_S " (%s)"),
- IP_ADDR_V(cl->vpn_ip), cl->hostname);
- return -1;
- }
-
- /*
- Suggestion of Hans Bayle
- */
- if((fw = lookup_conn(vpn_ip)))
- {
- if(fw->nexthop == cl)
- notify_others(fw, cl, send_add_host);
- else
- syslog(LOG_DEBUG, _("Invalid ADD_HOST from " IP_ADDR_S " (%s)"),
- IP_ADDR_V(cl->vpn_ip), cl->hostname);
- return -1;
- }
-
- ncn = new_conn_list();
- ncn->real_ip = real_ip;
- ncn->hostname = hostlookup(htonl(real_ip));
- ncn->vpn_ip = vpn_ip;
- ncn->vpn_mask = vpn_mask;
- ncn->port = port;
- ncn->flags = flags;
- ncn->nexthop = cl;
- ncn->next = conn_list;
- conn_list = ncn;
- ncn->status.active = 1;
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got ADD_HOST for " IP_ADDR_S " (%s) from " IP_ADDR_S " (%s)"),
- IP_ADDR_V(ncn->vpn_ip), ncn->hostname, IP_ADDR_V(cl->vpn_ip), cl->hostname);
-
- notify_others(ncn, cl, send_add_host);
-cp
- return 0;
-}