/*
- protocol.c -- handle the meta-protocol
- Copyright (C) 1999,2000 Ivo Timmermans <itimmermans@bigfoot.com>,
- 2000 Guus Sliepen <guus@sliepen.warande.net>
+ protocol.c -- handle the meta-protocol, basic functions
+ Copyright (C) 1999-2004 Ivo Timmermans <ivo@tinc-vpn.org>,
+ 2000-2004 Guus Sliepen <guus@tinc-vpn.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: protocol.c,v 1.28.4.31 2000/09/14 21:51:21 zarq Exp $
+ $Id$
*/
-#include "config.h"
-
-#include <sys/types.h>
-
-#include <stdlib.h>
-#include <string.h>
-#include <syslog.h>
-#include <sys/socket.h>
-#include <unistd.h>
-#include <stdio.h>
-
-#include <utils.h>
-#include <xalloc.h>
-
-#include <netinet/in.h>
-
-#include <openssl/sha.h>
+#include "system.h"
#include "conf.h"
-#include "encr.h"
-#include "net.h"
-#include "netutl.h"
+#include "connection.h"
+#include "logger.h"
+#include "meta.h"
#include "protocol.h"
+#include "utils.h"
+#include "xalloc.h"
-#include "system.h"
-
-/* Generic outgoing request routine - takes care of logging and error detection as well */
-
-int send_request(conn_list_t *cl, const char *format, int request, /*args*/ ...)
-{
- va_list args;
- char *buffer = NULL;
- int len;
-
-cp
- if(debug_lvl >= DEBUG_PROTOCOL)
- syslog(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request], cl->name, cl->hostname);
-
- va_start(args, request);
- len = vasprintf(&buffer, format, args);
- va_end(args);
-
- if(len < 0 || !buffer)
- {
- syslog(LOG_ERR, _("Error during vasprintf(): %m"));
- return -1;
- }
-
- if(debug_lvl >= DEBUG_META)
- syslog(LOG_DEBUG, _("Sending meta data to %s (%s): %s"),
- cl->name, cl->hostname, buffer);
-
- if(cl->status.encryptin)
- {
- /* FIXME: Do encryption */
- }
-
- if((write(cl->meta_socket, buffer, len)) < 0)
- {
- syslog(LOG_ERR, _("Sending meta data failed: %m"));
- return -1;
- }
-cp
-}
+bool tunnelserver = false;
-/* Connection protocol:
+/* Jumptable for the request handlers */
- Client Server
- send_id(u)
- send_challenge(R)
- send_chal_reply(BH)
- send_id(B)
- send_challenge(BR)
- send_chal_reply(BH)
- send_ack(B)
- send_ack(B)
+static bool (*request_handlers[])(connection_t *) = {
+ id_h, metakey_h, challenge_h, chal_reply_h, ack_h,
+ status_h, error_h, termreq_h,
+ ping_h, pong_h,
+ add_subnet_h, del_subnet_h,
+ add_edge_h, del_edge_h,
+ key_changed_h, req_key_h, ans_key_h, tcppacket_h,
+};
- (u) Unencrypted,
- (R) RSA,
- (H) SHA1,
- (B) Blowfish.
+/* Request names */
- Part of the challenge is directly used to set the blowfish key and the initial vector.
- (Twee vliegen in één klap!)
-*/
+static char (*request_name[]) = {
+ "ID", "METAKEY", "CHALLENGE", "CHAL_REPLY", "ACK",
+ "STATUS", "ERROR", "TERMREQ",
+ "PING", "PONG",
+ "ADD_SUBNET", "DEL_SUBNET",
+ "ADD_EDGE", "DEL_EDGE", "KEY_CHANGED", "REQ_KEY", "ANS_KEY", "PACKET",
+};
-int send_id(conn_list_t *cl)
-{
-cp
- return send_request(cl, "%d %s %d %s", ID,
- myself->name, myself->protocol_version, opt2str(myself->options));
-}
+static avl_tree_t *past_request_tree;
-int id_h(conn_list_t *cl)
+bool check_id(const char *id)
{
- conn_list_t *old;
- char *options;
-cp
- if(sscanf(cl->buffer, "%*d %as %d %as", &cl->name, &cl->protocol_version, &options) != 3)
- {
- syslog(LOG_ERR, _("Got bad ID from %s"), cl->hostname);
- return -1;
- }
-
- /* Check if version matches */
-
- if(cl->protocol_version != myself->protocol_version)
- {
- syslog(LOG_ERR, _("Peer %s (%s) uses incompatible version %d"),
- cl->name, cl->hostname, cl->protocol_version);
- return -1;
- }
-
- /* Check if option string is valid */
-
- if((cl->options = str2opt(options)) == -1)
- {
- syslog(LOG_ERR, _("Peer %s uses invalid option string"), cl->hostname);
- return -1;
- }
-
- /* Check if identity is a valid name */
-
- if(!check_id(cl->name))
- {
- syslog(LOG_ERR, _("Peer %s uses invalid identity name"), cl->hostname);
- return -1;
- }
-
- /* Load information about peer */
-
- if(!read_id(cl))
- {
- syslog(LOG_ERR, _("Peer %s had unknown identity (%s)"), cl->hostname, cl->name);
- return -1;
- }
-
-
- /* 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(cl->status.outgoing)
- {
- if((old = lookup_id(cl->name)))
- {
- if(debug_lvl > DEBUG_CONNECTIONS)
- syslog(LOG_NOTICE, _("Uplink %s (%s) is already in our connection list"), cl->name, cl->hostname);
- cl->status.outgoing = 0;
- old->status.outgoing = 1;
- terminate_connection(cl);
- return 0;
- }
- }
-
- /* Send a challenge to verify the identity */
-
- cl->allow_request = CHAL_REPLY;
-cp
- return send_challenge(cl);
-}
+ for(; *id; id++)
+ if(!isalnum(*id) && *id != '_')
+ return false;
-int send_challenge(conn_list_t *cl)
-{
- char *buffer;
- int keylength;
- int x;
-cp
- if(cl->chal_answer)
- free(cl->chal_answer);
-
- /* Allocate buffers for the challenge and the hash */
-
- cl->chal_answer = xmalloc(SHA_DIGEST_LENGTH);
- keylength = BN_num_bytes(cl->rsakey->length);
- buffer = xmalloc(keylength*2);
-
- /* Copy random data and the public key to the buffer */
-
- RAND_bytes(buffer, keylength);
- BN_bn2bin(cl->rsakey->length, buffer+keylength);
-
- /* If we don't have a blowfish key set yet, use the random data from the challenge to do so. */
-
- if(!cl->status.encryptin)
- {
- set_metakey(cl, buffer, keylength);
- }
-
- /* Calculate the hash from that */
-
- SHA1(buffer, keylength*2, cl->chal_answer);
-
- /* Convert the random data to a hexadecimal formatted string */
-
- bin2hex(buffer,buffer,keylength);
- buffer[keylength*2] = '\0';
-
- /* Send the challenge */
-
- cl->allow_request = CHAL_REPLY;
- x = send_request(cl, "%d %s", CHALLENGE, buffer);
- free(buffer);
- cl->status.encryptout = 1;
-cp
- return x;
+ return true;
}
-int challenge_h(conn_list_t *cl)
-{
- char *challenge;
- int x;
-
-cp
- if(sscanf(cl->buffer, "%*d %as", &cl->name, &challenge) != 1)
- {
- syslog(LOG_ERR, _("Got bad CHALLENGE from %s (%s)"), cl->name, cl->hostname);
- return -1;
- }
-
- /* Rest is done by send_chal_reply() */
-
- x = send_chal_reply(cl, challenge);
- free(challenge);
-cp
- return x;
-}
+/* Generic request routines - takes care of logging and error
+ detection as well */
-int send_chal_reply(conn_list_t *cl, char *challenge)
+bool send_request(connection_t *c, const char *format, ...)
{
- char *buffer;
- int keylength;
- char *hash;
- int x;
-
-cp
- keylength = BN_num_bytes(myself->rsakey->length);
-
- /* Check if the length of the challenge is all right */
-
- if(strlen(challenge) != keylength*2)
- {
- syslog(LOG_ERR, _("Intruder: wrong challenge length from %s (%s)"), cl->name, cl->hostname);
- return -1;
- }
+ va_list args;
+ char buffer[MAXBUFSIZE];
+ int len, request;
- /* Allocate buffers for the challenge and the hash */
-
- buffer = xmalloc(keylength*2);
- hash = xmalloc(SHA_DIGEST_LENGTH*2+1);
+ cp();
- /* Copy the incoming random data and our public key to the buffer */
+ /* Use vsnprintf instead of vasprintf: faster, no memory
+ fragmentation, cleanup is automatic, and there is a limit on the
+ input buffer anyway */
- hex2bin(challenge, buffer, keylength);
- BN_bn2bin(myself->rsakey->length, buffer+keylength);
+ va_start(args, format);
+ len = vsnprintf(buffer, MAXBUFSIZE, format, args);
+ va_end(args);
- /* Calculate the hash from that */
-
- SHA1(buffer, keylength*2, hash);
+ if(len < 0 || len > MAXBUFSIZE - 1) {
+ logger(LOG_ERR, _("Output buffer overflow while sending request to %s (%s)"),
+ c->name, c->hostname);
+ return false;
+ }
- /* If we don't have a blowfish key set yet, use the random data from the challenge to do so. */
-
- if(!cl->status.encrypted)
- {
- set_metakey(cl, buffer, keylength);
- cl->status.encrypted = 1;
- }
+ ifdebug(PROTOCOL) {
+ sscanf(buffer, "%d", &request);
+ ifdebug(META)
+ logger(LOG_DEBUG, _("Sending %s to %s (%s): %s"),
+ request_name[request], c->name, c->hostname, buffer);
+ else
+ logger(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request],
+ c->name, c->hostname);
+ }
- free(buffer);
+ buffer[len++] = '\n';
- /* Convert the hash to a hexadecimal formatted string */
-
- bin2hex(hash,hash,SHA_DIGEST_LENGTH);
- hash[SHA_DIGEST_LENGTH*2] = '\0';
-
- /* Send the reply */
-
- if(cl->status.outgoing)
- cl->allow_request = ID;
- else
- cl->allow_request = ACK;
-
- x = send_request(cl, "%d %s", CHAL_REPLY, hash);
- free(hash);
-cp
- return x;
-}
-
-int chal_reply_h(conn_list_t *cl)
-{
- char *hash;
-cp
- if(sscanf(cl->buffer, "%*d %as", &cl->name, &hash) != 2)
- {
- syslog(LOG_ERR, _("Got bad CHAL_REPLY from %s (%s)"), cl->name, cl->hostname);
- return -1;
- }
-
- /* Check if the length of the hash is all right */
-
- if(strlen(hash) != SHA_DIGEST_LENGTH*2)
- {
- syslog(LOG_ERR, _("Intruder: wrong challenge reply length from %s (%s)"), cl->name, cl->hostname);
- return -1;
- }
-
- /* Convert the hash to binary format */
-
- hex2bin(hash, hash, SHA_DIGEST_LENGTH);
-
- /* Verify the incoming hash with the calculated hash */
-
- if(!memcmp(hash, cl->chal_answer, SHA_DIGEST_LENGTH))
- {
- syslog(LOG_ERR, _("Intruder: wrong challenge reply from %s (%s)"), cl->name, cl->hostname);
- return -1;
- }
-
- /* Identity has now been positively verified.
- If we are accepting this new connection, then send our identity,
- if we are making this connecting, acknowledge.
- */
-
- free(hash);
- free(cl->chal_answer);
-
-cp
- if(cl->status.outgoing)
- {
- cl->allow_request = ACK;
- return send_ack(cl);
- }
- else
- {
- cl->allow_request = CHALLENGE;
- return send_id(cl);
- }
+ if(c == broadcast) {
+ broadcast_meta(NULL, buffer, len);
+ return true;
+ } else
+ return send_meta(c, buffer, len);
}
-int send_ack(conn_list_t *cl)
+void forward_request(connection_t *from)
{
-cp
- return send_request(cl, "%d", ACK);
-}
+ int request;
-int ack_h(conn_list_t *cl)
-{
- conn_list_t *old;
-
-cp
- /* 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_id(cl->name)))
- {
- if(debug_lvl > DEBUG_CONNECTIONS)
- syslog(LOG_NOTICE, _("Removing old entry for %s at %s in favour of new connection from %s"),
- cl->name, old->hostname, cl->hostname);
- old->status.active = 0;
- terminate_connection(old);
- }
-
- /* Activate this connection */
-
- cl->allow_request = ALL;
- cl->status.active = 1;
-
- if(debug_lvl > DEBUG_CONNECTIONS)
- syslog(LOG_NOTICE, _("Connection with %s (%s) activated"), cl->name, cl->hostname);
-
- /* Exchange information about other tinc daemons */
-
- notify_others(cl, NULL, send_add_host);
- notify_one(cl);
-
- upstreamindex = 0;
-
-cp
- if(cl->status.outgoing)
- return 0;
- else
- return send_ack(cl);
-}
+ cp();
-/* Address and subnet information exchange */
+ ifdebug(PROTOCOL) {
+ sscanf(from->buffer, "%d", &request);
+ ifdebug(META)
+ logger(LOG_DEBUG, _("Forwarding %s from %s (%s): %s"),
+ request_name[request], from->name, from->hostname,
+ from->buffer);
+ else
+ logger(LOG_DEBUG, _("Forwarding %s from %s (%s)"),
+ request_name[request], from->name, from->hostname);
+ }
-int send_add_subnet(conn_list_t *cl, conn_list_t *other, subnet_t *subnet)
-{
-cp
-/* return send_request(cl, "%d %s %d %s", ADD_SUBNET,
- other->name, subnet->type, net2str(subnet)); */
- return send_request(cl, "%d %s %s", ADD_SUBNET,
- other->name, net2str(subnet));
-}
+ from->buffer[from->reqlen - 1] = '\n';
-int add_subnet_h(conn_list_t *cl)
-{
+ broadcast_meta(from, from->buffer, from->reqlen);
}
-int send_del_subnet(conn_list_t *cl, conn_list_t *other, subnet_t *subnet)
+bool receive_request(connection_t *c)
{
-cp
- return send_request(cl, "%d %s %s", DEL_SUBNET, other->name, net2str(subnet));
-}
+ int request;
-int del_subnet_h(conn_list_t *cl)
-{
-}
+ cp();
-/* New and closed connections notification */
+ if(sscanf(c->buffer, "%d", &request) == 1) {
+ if((request < 0) || (request >= LAST) || !request_handlers[request]) {
+ ifdebug(META)
+ logger(LOG_DEBUG, _("Unknown request from %s (%s): %s"),
+ c->name, c->hostname, c->buffer);
+ else
+ logger(LOG_ERR, _("Unknown request from %s (%s)"),
+ c->name, c->hostname);
-int send_add_host(conn_list_t *cl, conn_list_t *other)
-{
-cp
- return send_request(cl, "%d %s %lx:%d %s", ADD_HOST, other->name, other->real_ip, other->port, opt2str(other->options));
-}
+ return false;
+ } else {
+ ifdebug(PROTOCOL) {
+ ifdebug(META)
+ logger(LOG_DEBUG, _("Got %s from %s (%s): %s"),
+ request_name[request], c->name, c->hostname,
+ c->buffer);
+ else
+ logger(LOG_DEBUG, _("Got %s from %s (%s)"),
+ request_name[request], c->name, c->hostname);
+ }
+ }
-int add_host_h(conn_list_t *cl)
-{
- char *options;
- conn_list_t *old, *new;
-cp
- new = new_conn_list();
-
- if(sscanf(cl->buffer, "%*d %as %lx:%d %as", &new->name, &new->real_ip, &new->port, &options) != 4)
- {
- 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(options)) == -1)
- {
- syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s): invalid option string"), cl->name, cl->hostname);
- return -1;
- }
-
- /* Check if identity is a valid name */
-
- if(!check_id(new->name))
- {
- syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s): invalid identity name"), cl->name, cl->hostname);
- return -1;
- }
-
- /* Check if somebody tries to add ourself */
-
- if(!strcmp(new->name, myself->name))
- {
- syslog(LOG_ERR, _("Warning: got ADD_HOST from %s (%s) for ourself, restarting"), cl->name, cl->hostname);
- sighup = 1;
- return 0;
- }
-
- /* Fill in more of the new conn_list structure */
-
- new->hostname = hostlookup(htonl(new->real_ip));
-
- /* Check if the new host already exists in the connnection list */
-
- if((old = lookup_id(new->name)))
- {
- if((new->real_ip == old->real_ip) && (new->port == old->port))
- {
- if(debug_lvl > DEBUG_CONNECTIONS)
- syslog(LOG_NOTICE, _("Got duplicate ADD_HOST for %s (%s) from %s (%s)"),
- old->name, old->hostname, new->name, new->hostname);
- return 0;
- }
- else
- {
- if(debug_lvl > DEBUG_CONNECTIONS)
- syslog(LOG_NOTICE, _("Removing old entry for %s (%s)"),
- old->name, old->hostname);
- old->status.active = 0;
- terminate_connection(old);
- }
- }
-
- /* Fill in rest of conn_list structure */
-
- new->nexthop = cl;
- new->status.active = 1;
-
- /* Hook it up into the conn_list */
-
- conn_list_add(conn_list, new);
-
- /* Tell the rest about the new host */
-
- notify_others(new, cl, send_add_host);
-
-cp
- return 0;
-}
+ if((c->allow_request != ALL) && (c->allow_request != request)) {
+ logger(LOG_ERR, _("Unauthorized request from %s (%s)"), c->name,
+ c->hostname);
+ return false;
+ }
-int send_del_host(conn_list_t *cl, conn_list_t *other)
-{
-cp
- return send_request(cl, "%d %s %lx:%d", DEL_HOST,
- other->name, other->real_ip, other->port);
-}
-
-int del_host_h(conn_list_t *cl)
-{
- char *id;
- ip_t address;
- port_t port;
- conn_list_t *old;
-
-cp
- if(sscanf(cl->buffer, "%*d %as %lx:%d", &id, &address, &port) != 3)
- {
- syslog(LOG_ERR, _("Got bad DEL_HOST from %s (%s)"),
- cl->name, cl->hostname);
- return -1;
- }
-
- /* Check if somebody tries to delete ourself */
-
- if(!strcmp(id, myself->name))
- {
- syslog(LOG_ERR, _("Warning: got DEL_HOST from %s (%s) for ourself, restarting"),
- cl->name, cl->hostname);
- sighup = 1;
- return 0;
- }
-
- /* Check if the new host already exists in the connnection list */
-
- if((old = lookup_id(id)))
- {
- if((address == old->real_ip) && (port == old->port))
- {
- notify_others(old, cl, send_del_host);
-
- old->status.termreq = 1;
- old->status.active = 0;
-
- terminate_connection(old);
-cp
- return 0;
- }
- }
-
- if(debug_lvl > DEBUG_CONNECTIONS)
- {
- syslog(LOG_NOTICE, _("Got DEL_HOST for %s from %s (%s) which is not in our connection list"),
- id, cl->name, cl->hostname);
- }
-cp
- return 0;
-}
-
-/* Status and error notification routines */
+ if(!request_handlers[request](c)) {
+ /* Something went wrong. Probably scriptkiddies. Terminate. */
-int send_status(conn_list_t *cl, int statusno, char *statusstring)
-{
-cp
- if(!statusstring)
- statusstring = status_text[statusno];
-cp
- return send_request(cl, "%d %d %s", STATUS, statusno, statusstring);
-}
+ logger(LOG_ERR, _("Error while processing %s from %s (%s)"),
+ request_name[request], c->name, c->hostname);
+ return false;
+ }
+ } else {
+ logger(LOG_ERR, _("Bogus data received from %s (%s)"),
+ c->name, c->hostname);
+ return false;
+ }
-int status_h(conn_list_t *cl)
-{
- int statusno;
- char *statusstring;
-cp
- if(sscanf(cl->buffer, "%*d %d %as", &statusno, &statusstring) != 2)
- {
- syslog(LOG_ERR, _("Got bad STATUS from %s (%s)"), cl->id, cl->hostname);
- return -1;
- }
-
- if(debug_lvl > DEBUG_STATUS)
- {
- syslog(LOG_NOTICE, _("Status message from %s (%s): %s: %s"),
- cl->name, cl->hostname, status_text[statusno], statusstring);
- }
-
-cp
- free(statusstring);
- return 0;
+ return true;
}
-int send_error(conn_list_t *cl, int errno, char *errstring)
+static int past_request_compare(const past_request_t *a, const past_request_t *b)
{
-cp
- if(!errstring)
- errstring = error_text[errno];
- return send_request(cl, "%d %d %s", ERROR, errno, errstring);
+ return strcmp(a->request, b->request);
}
-int error_h(conn_list_t *cl)
+static void free_past_request(past_request_t *r)
{
- int errno;
- char *errorstring;
-cp
- if(sscanf(cl->buffer, "%*d %d %as", &errno, &errorstring) != 2)
- {
- syslog(LOG_ERR, _("Got bad error from %s (%s)"),
- cl->name, cl->hostname);
- return -1;
- }
-
- if(debug_lvl > DEBUG_error)
- {
- syslog(LOG_NOTICE, _("Error message from %s (%s): %s: %s"),
- cl->name, cl->hostname, error_text[errno], errorstring);
- }
-
- free(errorstring);
- cl->status.termreq = 1;
- terminate_connection(cl);
-cp
- return 0;
-}
+ cp();
-int send_termreq(conn_list_t *cl)
-{
-cp
- return send_request(cl, "%d", TERMREQ);
-}
+ if(r->request)
+ free(r->request);
-int termreq_h(conn_list_t *cl)
-{
-cp
- cl->status.termreq = 1;
- terminate_connection(cl);
-cp
- return 0;
+ free(r);
}
-/* Keepalive routines - FIXME: needs a closer look */
-
-int send_ping(conn_list_t *cl)
+void init_requests(void)
{
- cl->status.pinged = 1;
-cp
- return send_request(cl, "%d", PING);
-}
+ cp();
-int ping_h(conn_list_t *cl)
-{
-cp
- return send_pong(cl);
+ past_request_tree = avl_alloc_tree((avl_compare_t) past_request_compare, (avl_action_t) free_past_request);
}
-int send_pong(conn_list_t *cl)
+void exit_requests(void)
{
-cp
- return send_request(cl, "%d", PONG);
-}
+ cp();
-int pong_h(conn_list_t *cl)
-{
-cp
- cl->status.got_pong = 1;
-cp
- return 0;
+ avl_delete_tree(past_request_tree);
}
-/* Key exchange */
-
-int send_key_changed(conn_list_t *from, conn_list_t *cl)
+bool seen_request(char *request)
{
- conn_list_t *p;
-cp
- for(p = conn_list; p != NULL; p = p->next)
- {
- if(p!=cl && p->status.meta && p->status.active)
- send_request(p, "%d %s", KEY_CHANGED,
- from->name);
- }
-cp
- return 0;
-}
+ past_request_t *new, p = {0};
-int key_changed_h(conn_list_t *cl)
-{
- char *from_id;
- conn_list_t *from;
-cp
- if(sscanf(cl->buffer, "%*d %as", &from_id) != 1)
- {
- syslog(LOG_ERR, _("Got bad KEY_CHANGED from %s (%s)"),
- cl->name, cl->hostname);
- return -1;
- }
-
- if(!(from = lookup_id(from_id)))
- {
- syslog(LOG_ERR, _("Got KEY_CHANGED from %s (%s) origin %s which does not exist in our connection list"), cl->id, cl->hostname, from_id);
- free(from_id);
- return -1;
- }
-
- free(from_id);
-
- from->status.validkey = 0;
- from->status.waitingforkey = 0;
-
- send_key_changed(from, cl);
-cp
- return 0;
-}
-
-int send_req_key(conn_list_t *from, conn_list_t *to)
-{
-cp
- return send_request(to->nexthop, "%d %s %s", REQ_KEY, from->id, to->id);
-}
+ cp();
-int req_key_h(conn_list_t *cl)
-{
- char *from_id, *to_id;
- conn_list_t *from, *to;
-cp
- if(sscanf(cl->buffer, "%*d %as %as", &from_id, &to_id) != 2)
- {
- syslog(LOG_ERR, _("Got bad REQ_KEY from %s (%s)"), cl->id, cl->hostname);
- return -1;
- }
-
- if(!(from = lookup_id(from_id)))
- {
- syslog(LOG_ERR, _("Got REQ_KEY from %s (%s) origin %s which does not exist in our connection list"), cl->id, cl->hostname, from_id);
- free(from_id); free(to_id);
- return -1;
- }
-
- /* Check if this key request is for us */
-
- if(!strcmp(id, myself->strcmp))
- {
- send_ans_key(myself, from, myself->datakey);
- }
- else
- {
- if(!(to = lookup_id(to_id)))
- {
- syslog(LOG_ERR, _("Got REQ_KEY from %s (%s) destination %s which does not exist in our connection list"), cl->id, cl->hostname, to_id);
- free(from_id); free(to_id);
- return -1;
- }
- send_req_key(from, to);
- }
-
- free(from_id); free(to_id);
-cp
- return 0;
-}
+ p.request = request;
-int send_ans_key(conn_list_t *from, conn_list_t *to, char *datakey)
-{
-cp
- return send_request(to->nexthop, "%d %s %s %s", ANS_KEY, from->id, to->id, datakey);
+ if(avl_search(past_request_tree, &p)) {
+ ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Already seen request"));
+ return true;
+ } else {
+ new = xmalloc(sizeof(*new));
+ new->request = xstrdup(request);
+ new->firstseen = now;
+ avl_insert(past_request_tree, new);
+ return false;
+ }
}
-int ans_key_h(conn_list_t *cl)
+void age_past_requests(void)
{
- char *from_id, *to_id, *datakey;
- int keylength;
- conn_list_t *from, *to;
-cp
- if(sscanf(cl->buffer, "%*d %as %as %as", &from_id, &to_id, &datakey) != 3)
- {
- syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s)"), cl->id, cl->hostname);
- return -1;
- }
-
- if(!(from = lookup_id(from_id)))
- {
- syslog(LOG_ERR, _("Got ANS_KEY from %s (%s) origin %s which does not exist in our connection list"), cl->id, cl->hostname, from_id);
- free(from_id); free(to_id); free(datakey);
- return -1;
- }
-
- /* Check if this key request is for us */
-
- if(!strcmp(id, myself->strcmp))
- {
- /* It is for us, convert it to binary and set the key with it. */
-
- keylength = strlen(datakey);
-
- if((keylength%2) || (keylength <= 0))
- {
- syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s) origin %s: invalid key"), cl->id, cl->hostname, from->id);
- free(from_id); free(to_id); free(datakey);
- return -1;
- }
- keylength /= 2;
- hex2bin(datakey, datakey, keylength);
- BF_set_key(cl->datakey, keylength, datakey);
- }
- else
- {
- if(!(to = lookup_id(to_id)))
- {
- syslog(LOG_ERR, _("Got ANS_KEY from %s (%s) destination %s which does not exist in our connection list"), cl->id, cl->hostname, to_id);
- free(from_id); free(to_id); free(datakey);
- return -1;
- }
- send_ans_key(from, to, datakey);
- }
-
- free(from_id); free(to_id); free(datakey);
-cp
- return 0;
-}
-
-/* Old routines */
+ avl_node_t *node, *next;
+ past_request_t *p;
+ int left = 0, deleted = 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.
-*/
+ cp();
-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;
-}
+ for(node = past_request_tree->head; node; node = next) {
+ next = node->next;
+ p = node->data;
-/*
- Notify one connection of everything
- I have connected
-*/
+ if(p->firstseen + pingtimeout < now)
+ avl_delete_node(past_request_tree, node), deleted++;
+ else
+ left++;
+ }
-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;
+ if(left || deleted)
+ ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Aging past requests: deleted %d, left %d"),
+ deleted, left);
}
-
-/* "Complete overhaul". */
-
-int (*request_handlers[])(conn_list_t*) = {
- id_h, challenge_h, chal_reply_h, ack_h,
- status_h, error_h, termreq_h,
- ping_h, pong_h,
- add_host_h, del_host_h,
- add_subnet_h, del_subnet_h,
- key_changed_h, req_key_h, ans_key_h,
-};
-
-char (*request_name[]) = {
- "ID", "CHALLENGE", "CHAL_REPLY", "ACK",
- "STATUS", "ERROR", "TERMREQ",
- "PING", "PONG",
- "ADD_HOST", "DEL_HOST",
- "ADD_SUBNET", "DEL_SUBNET",
- "KEY_CHANGED", "REQ_KEY", "ANS_KEY",
-};