-/*
- 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)
-{
- conn_list_t *old;
-cp
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got BASIC_INFO from %s"), cl->real_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 %s"),
- cl->real_hostname);
- return -1;
- }
-
- cl->vpn_hostname = hostlookup(htonl(cl->vpn_ip));
-
- if(cl->protocol_version != PROT_CURRENT)
- {
- syslog(LOG_ERR, _("Peer uses incompatible protocol version %d"),
- cl->protocol_version);
- return -1;
- }
-
- if(cl->status.outgoing)
- {
- /* First check if the host we connected to is already in our
- connection list. If so, we are probably making a loop, which
- is not desirable.
- */
-
- if(old=lookup_conn(cl->vpn_ip))
- {
- if(debug_lvl>0)
- syslog(LOG_NOTICE, _("Uplink %s (%s) is already in our connection list"),
- cl->vpn_hostname, cl->real_hostname);
- cl->status.outgoing = 0;
- old->status.outgoing = 1;
- terminate_connection(cl);
- return 0;
- }
-
- 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 %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
- cl->pp->len = strlen(cl->pp->phrase);
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got PASSPHRASE from %s (%s)"),
- cl->vpn_hostname, cl->real_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 %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got PUBLIC_KEY from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
-
- if(verify_passphrase(cl, g_n))
- {
- /* intruder! */
- syslog(LOG_ERR, _("Intruder from %s: passphrase for %s does not match!"),
- cl->real_hostname, cl->vpn_hostname);
- 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.
- */
-
- while(old = lookup_conn(cl->vpn_ip))
- {
- syslog(LOG_NOTICE, _("Removing old entry for %s at %s in favour of new connection from %s"),
- cl->vpn_hostname, old->real_hostname, cl->real_hostname);
- old->status.active = 0;
- terminate_connection(old);
- }
-
- cl->status.active = 1;
-
- if(debug_lvl > 0)
- syslog(LOG_NOTICE, _("Connection with %s (%s) activated"),
- cl->vpn_hostname, cl->real_hostname);
-
- 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 %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
-
- cl->status.active = 1;
-
- syslog(LOG_NOTICE, _("Connection with %s (%s) activated"),
- cl->vpn_hostname, cl->real_hostname);
-
- notify_others(cl, NULL, send_add_host);
- notify_one(cl);
-
- upstreamindex = 0;
-cp
- return 0;
-}
-
-int termreq_h(conn_list_t *cl)
-{
-cp
- if(!cl->status.active)
- {
- syslog(LOG_ERR, _("Got unauthorized TERMREQ from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got TERMREQ from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
-
- cl->status.termreq = 1;
-
- 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 %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got TIMEOUT from %s (%s)"),
- cl->vpn_hostname, cl->real_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 %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
-
- if(sscanf(cl->buffer, "%*d %lx", &vpn_ip) != 1)
- {
- syslog(LOG_ERR, _("Got bad DEL_HOST from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
-
- if(!(fw = lookup_conn(vpn_ip)))
- {
- syslog(LOG_ERR, _("Got DEL_HOST for %d.%d.%d.%d from %s (%s) which does not exist?"),
- IP_ADDR_V(vpn_ip), cl->vpn_hostname, cl->real_hostname);
- return 0;
- }
-
- /* Connections lists are really messed up if this happens */
- if(vpn_ip == myself->vpn_ip)
- {
- syslog(LOG_ERR, _("Warning: got DEL_HOST from %s (%s) for ourself, restarting"),
- cl->vpn_hostname, cl->real_hostname);
- sighup = 1;
- return 0;
- }
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got DEL_HOST for %s (%s) from %s (%s)"),
- fw->vpn_hostname, fw->real_hostname, cl->vpn_hostname, cl->real_hostname);
-
- notify_others(fw, cl, send_del_host);
-
- fw->status.termreq = 1;
- fw->status.active = 0;
-
- 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 %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got PING from %s (%s)"),
- cl->vpn_hostname, cl->real_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 %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got PONG from %s (%s)"),
- cl->vpn_hostname, cl->real_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, *old;
-cp
- if(!cl->status.active)
- {
- syslog(LOG_ERR, _("Got unauthorized ADD_HOST from %s (%s)"),
- cl->vpn_hostname, cl->real_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 %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
-
- if(old = lookup_conn(vpn_ip))
- {
- if((real_ip==old->real_ip) && (vpn_mask==old->vpn_mask) && (port==old->port))
- {
- if(debug_lvl>1)
- syslog(LOG_NOTICE, _("Got duplicate ADD_HOST for %s (%s) from %s (%s)"),
- old->vpn_hostname, old->real_hostname, cl->vpn_hostname, cl->real_hostname);
- goto skip_add_host; /* One goto a day keeps the deeply nested if constructions away. */
- }
- else
- {
- if(debug_lvl>1)
- syslog(LOG_NOTICE, _("Removing old entry for %s (%s)"),
- old->vpn_hostname, old->real_hostname);
- old->status.active = 0;
- terminate_connection(old);
- }
- }
-
- /* Connections lists are really messed up if this happens */
- if(vpn_ip == myself->vpn_ip)
- {
- syslog(LOG_ERR, _("Warning: got ADD_HOST from %s (%s) for ourself, restarting"),
- cl->vpn_hostname, cl->real_hostname);
- sighup = 1;
- return 0;
- }
-
- ncn = new_conn_list();
- ncn->real_ip = real_ip;
- ncn->real_hostname = hostlookup(htonl(real_ip));
- ncn->vpn_ip = vpn_ip;
- ncn->vpn_mask = vpn_mask;
- ncn->vpn_hostname = hostlookup(htonl(vpn_ip));
- 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 %s (%s) from %s (%s)"),
- ncn->vpn_hostname, ncn->real_hostname, cl->vpn_hostname, cl->real_hostname);
-
-skip_add_host:
-
- notify_others(ncn, cl, send_add_host);
-cp
- return 0;
-}