along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: protocol.c,v 1.28.4.34 2000/09/22 15:06:28 guus Exp $
+ $Id: protocol.c,v 1.28.4.36 2000/09/26 14:06:06 guus Exp $
*/
#include "config.h"
#include "net.h"
#include "netutl.h"
#include "protocol.h"
+#include "meta.h"
#include "system.h"
return 1;
}
-/* Generic outgoing request routine - takes care of logging and error detection as well */
+/* Generic request routines - takes care of logging and error detection as well */
int send_request(conn_list_t *cl, const char *format, int request, /*args*/ ...)
{
return -1;
}
- if(debug_lvl >= DEBUG_META)
- syslog(LOG_DEBUG, _("Sending %s to %s (%s): %s"), request_name[request],
- cl->name, cl->hostname, buffer);
- else if(debug_lvl >= DEBUG_PROTOCOL)
+ if(debug_lvl >= DEBUG_PROTOCOL)
syslog(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request], cl->name, cl->hostname);
+cp
+ return send_meta(cl, buffer, length);
+}
-
- if(cl->status.encryptin)
+int receive_request(conn_list_t *cl)
+{
+ int request;
+cp
+ if(sscanf(cl->buffer, "%d", &request) == 1)
{
- /* FIXME: Do encryption */
+ if((request < 0) || (request > 255) || (request_handlers[request] == NULL))
+ {
+ syslog(LOG_ERR, _("Unknown request from %s (%s)"),
+ cl->name, cl->hostname);
+ return -1;
+ }
+ else
+ {
+ if(debug_lvl > DEBUG_PROTOCOL)
+ syslog(LOG_DEBUG, _("Got %s from %s (%s)"),
+ request_name[request], cl->name, cl->hostname);
+ }
+ if(request_handlers[request](cl))
+ /* Something went wrong. Probably scriptkiddies. Terminate. */
+ {
+ syslog(LOG_ERR, _("Error while processing %s from %s (%s)"),
+ request_name[request], cl->name, cl->hostname);
+ return -1;
+ }
}
-
- if((write(cl->meta_socket, buffer, len)) < 0)
+ else
{
- syslog(LOG_ERR, _("Sending meta data failed: %m"));
+ syslog(LOG_ERR, _("Bogus data received from %s (%s)"),
+ cl->name, cl->hostname);
return -1;
}
-cp
}
/* Connection protocol:
int send_id(conn_list_t *cl)
{
- int x;
- char *optstr;
-cp
- x = send_request(cl, "%d %s %d %s", ID, myself->name, myself->protocol_version, optstr=opt2str(myself->options));
- free(optstr);
cp
- return x;
+ return send_request(cl, "%d %s %d %lx", ID, myself->name, myself->protocol_version, myself->options);
}
int id_h(conn_list_t *cl)
{
conn_list_t *old;
- char *optstr;
cp
- if(sscanf(cl->buffer, "%*d %as %d %as", &cl->name, &cl->protocol_version, &optstr) != 3)
+ if(sscanf(cl->buffer, "%*d %as %d %lx", &cl->name, &cl->protocol_version, &cl->options) != 3)
{
syslog(LOG_ERR, _("Got bad ID from %s"), cl->hostname);
return -1;
return -1;
}
- /* Check if option string is valid */
-
- if((cl->options = str2opt(optstr)) == -1)
- {
- syslog(LOG_ERR, _("Peer %s uses invalid option string"), cl->hostname);
- free(optstr);
- return -1;
- }
-
- free(optstr);
-
/* Check if identity is a valid name */
if(!check_id(cl->name))
if(sscanf(cl->buffer, "%*d %as", &hishash) != 2)
{
syslog(LOG_ERR, _("Got bad CHAL_REPLY from %s (%s)"), cl->name, cl->hostname);
+ free(hishash);
return -1;
}
if(strlen(hishash) != SHA_DIGEST_LENGTH*2)
{
syslog(LOG_ERR, _("Intruder: wrong challenge reply length from %s (%s)"), cl->name, cl->hostname);
+ free(hishash);
return -1;
}
int send_add_host(conn_list_t *cl, conn_list_t *other)
{
- char *optstr;
- int x;
-cp
- x = send_request(cl, "%d %s %s %lx:%d %s", ADD_HOST,
- myself->name, other->name, other->real_ip, other->port, optstr = opt2str(other->options));
- free(optstr);
cp
- return x;
+ return send_request(cl, "%d %s %s %lx:%d %lx", ADD_HOST,
+ myself->name, other->name, other->real_ip, other->port, other->options);
}
int add_host_h(conn_list_t *cl)
{
- char *optstr;
char *sender;
conn_list_t *old, *new, *hisuplink;
cp
new = new_conn_list();
- if(sscanf(cl->buffer, "%*d %as %as %lx:%d %as", &sender, &new->name, &new->address, &new->port, &optstr) != 5)
+ if(sscanf(cl->buffer, "%*d %as %as %lx:%d %lx", &sender, &new->name, &new->address, &new->port, &new->options) != 5)
{
syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s)"), cl->name, cl->hostname);
return -1;
}
- /* Check if option string is valid */
-
- if((new->options = str2opt(optstr)) == -1)
- {
- syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s): invalid option string"), cl->name, cl->hostname);
- free(optstr); free(sender);
- return -1;
- }
-
- free(optstr);
-
/* Check if identity is a valid name */
if(!check_id(new->name) || !check_id(sender))
int send_del_host(conn_list_t *cl, conn_list_t *other)
{
- char *optstr;
- int x;
-cp
- x = send_request(cl, "%d %s %s %lx:%d %s", DEL_HOST,
- myself->name, other->name, other->real_ip, other->port, optstr = opt2str(other->options));
- free(optstr);
cp
- return x;
+ return send_request(cl, "%d %s %s %lx:%d %lx", DEL_HOST,
+ myself->name, other->name, other->real_ip, other->port, other->options);
}
int del_host_h(conn_list_t *cl)
{
char *name;
char *sender;
- char *opstr;
ip_t address;
port_t port;
int options;
conn_list_t *old, *hisuplink;
cp
- if(sscanf(cl->buffer, "%*d %as %as %lx:%d %as", &sender, &name, &address, &port, &optstr) != 5)
+ if(sscanf(cl->buffer, "%*d %as %as %lx:%d %lx", &sender, &name, &address, &port, &options) != 5)
{
syslog(LOG_ERR, _("Got bad DEL_HOST from %s (%s)"),
cl->name, cl->hostname);
return -1;
}
- /* Check if option string is valid */
-
- if((options = str2opt(optstr)) == -1)
- {
- syslog(LOG_ERR, _("Got bad DEL_HOST from %s (%s): invalid option string"), cl->name, cl->hostname);
- free(optstr); free(sender); free(name);
- return -1;
- }
-
- free(optstr);
-
/* Check if identity is a valid name */
if(!check_id(name) || !check_id(sender))
return 0;
}
-/* Old routines */
-
-/*
- 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;
-}
-
-/* "Complete overhaul". */
+/* Jumptable for the request handlers */
int (*request_handlers[])(conn_list_t*) = {
id_h, challenge_h, chal_reply_h, ack_h,
key_changed_h, req_key_h, ans_key_h,
};
+/* Request names */
+
char (*request_name[]) = {
"ID", "CHALLENGE", "CHAL_REPLY", "ACK",
"STATUS", "ERROR", "TERMREQ",
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