/*
- 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) 1999-2001 Ivo Timmermans <ivo@o2w.nl>,
+ 2000,2001 Guus Sliepen <guus@sliepen.eu.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 1.28.4.39 2000/10/14 17:04:15 guus Exp $
+ $Id: protocol.c,v 1.28.4.133 2002/09/04 16:26:44 guus Exp $
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
-#include <sys/socket.h>
-#include <unistd.h>
#include <stdio.h>
+#include <stdarg.h>
+#include <errno.h>
#include <utils.h>
#include <xalloc.h>
-#include <netinet/in.h>
-
-#include <openssl/sha.h>
-
#include "conf.h"
-#include "encr.h"
-#include "net.h"
-#include "netutl.h"
#include "protocol.h"
#include "meta.h"
+#include "connection.h"
#include "system.h"
+avl_tree_t *past_request_tree;
+
int check_id(char *id)
{
int i;
for (i = 0; i < strlen(id); i++)
- {
- if(!isalpha(id[i]) && id[i] != '_')
- {
- return 0;
- }
- }
-
- return 1;
+ if(!isalnum(id[i]) && id[i] != '_')
+ return -1;
+
+ return 0;
}
-/* Generic request routines - 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*/ ...)
+int send_request(connection_t *c, const char *format, ...)
{
va_list args;
- char buffer[MAXBUFSIZE+1];
- int len;
+ char buffer[MAXBUFSIZE];
+ int len, request;
cp
- /* Use vsnprintf instead of vasprintf: faster, no memory fragmentation, cleanup is automatic,
- and there is a limit on the input buffer anyway */
+ /* Use vsnprintf instead of vasprintf: faster, no memory
+ fragmentation, cleanup is automatic, and there is a limit on the
+ input buffer anyway */
- va_start(args, request);
- len = vsnprintf(buffer, MAXBUFSIZE+1, format, args);
+ va_start(args, format);
+ len = vsnprintf(buffer, MAXBUFSIZE, format, args);
va_end(args);
- if(len < 0 || len > MAXBUFSIZE)
+ if(len < 0 || len > MAXBUFSIZE-1)
{
- syslog(LOG_ERR, _("Output buffer overflow while sending %s to %s (%s)"), request_name[request], cl->name, cl->hostname);
+ syslog(LOG_ERR, _("Output buffer overflow while sending request to %s (%s)"), c->name, c->hostname);
return -1;
}
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, len);
-}
-
-int receive_request(conn_list_t *cl)
-{
- int request;
-cp
- if(sscanf(cl->buffer, "%d", &request) == 1)
{
- if((request < 0) || (request > 255) || (request_handlers[request] == NULL))
- {
- syslog(LOG_ERR, _("Unknown request from %s (%s)"),
- cl->name, cl->hostname);
- return -1;
- }
+ sscanf(buffer, "%d", &request);
+ if(debug_lvl >= DEBUG_META)
+ syslog(LOG_DEBUG, _("Sending %s to %s (%s): %s"), request_name[request], c->name, c->hostname, buffer);
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;
- }
- }
- else
- {
- syslog(LOG_ERR, _("Bogus data received from %s (%s)"),
- cl->name, cl->hostname);
- return -1;
- }
-}
-
-/* Connection protocol:
-
- Client Server
- send_id(u)
- send_challenge(R)
- send_chal_reply(H)
- send_id(u)
- send_challenge(R)
- send_chal_reply(H)
- ---------------------------------------
- Any negotations about the meta protocol
- encryption go here(u).
- ---------------------------------------
- send_ack(u)
- send_ack(u)
- ---------------------------------------
- Other requests(E)...
-
- (u) Unencrypted,
- (R) RSA,
- (H) SHA1,
- (E) Encrypted with symmetric cipher.
-
- Part of the challenge is directly used to set the symmetric cipher key and the initial vector.
- Since a man-in-the-middle cannot decrypt the RSA challenges, this means that he cannot get or
- forge the key for the symmetric cipher.
-*/
-
-int send_id(conn_list_t *cl)
-{
-cp
- 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;
-cp
- 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;
- }
-
- /* 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 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_host_config(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);
-}
-
-int send_challenge(conn_list_t *cl)
-{
- char buffer[CHAL_LENGTH*2+1];
-cp
- /* Allocate buffers for the challenge */
-
- if(!cl->hischallenge)
- cl->hischallenge = xmalloc(CHAL_LENGTH);
-
- /* Copy random data to the buffer */
-
- RAND_bytes(cl->hischallenge, CHAL_LENGTH);
-
- /* Convert the random data to a hexadecimal formatted string */
-
- bin2hex(cl->hischallenge,buffer,CHAL_LENGTH);
- buffer[CHAL_LENGTH*2] = '\0';
-
- /* Send the challenge */
-
- cl->allow_request = CHAL_REPLY;
-cp
- return send_request(cl, "%d %s", CHALLENGE, buffer);
-}
-
-int challenge_h(conn_list_t *cl)
-{
- char *buffer;
-cp
- if(sscanf(cl->buffer, "%*d %as", &buffer) != 1)
- {
- syslog(LOG_ERR, _("Got bad CHALLENGE from %s (%s)"), cl->name, cl->hostname);
- return -1;
- }
-
- /* Check if the length of the challenge is all right */
-
- if(strlen(buffer) != CHAL_LENGTH*2)
- {
- syslog(LOG_ERR, _("Intruder: wrong challenge length from %s (%s)"), cl->name, cl->hostname);
- free(buffer);
- return -1;
- }
-
- /* Allocate buffers for the challenge */
-
- if(!cl->mychallenge)
- cl->mychallenge = xmalloc(CHAL_LENGTH);
-
- /* Convert the challenge from hexadecimal back to binary */
-
- hex2bin(buffer,cl->mychallenge,CHAL_LENGTH);
- free(buffer);
-
- /* Rest is done by send_chal_reply() */
-cp
- return send_chal_reply(cl);
-}
-
-int send_chal_reply(conn_list_t *cl)
-{
- char hash[SHA_DIGEST_LENGTH*2+1];
-cp
- if(!cl->mychallenge)
- {
- syslog(LOG_ERR, _("Trying to send CHAL_REPLY to %s (%s) without a valid CHALLENGE"), cl->name, cl->hostname);
- return -1;
- }
-
- /* Calculate the hash from the challenge we received */
-
- SHA1(cl->mychallenge, CHAL_LENGTH, hash);
-
- /* 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;
-
-cp
- return send_request(cl, "%d %s", CHAL_REPLY, hash);
-}
-
-int chal_reply_h(conn_list_t *cl)
-{
- char *hishash;
- char myhash[SHA_DIGEST_LENGTH];
-cp
- 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;
- }
-
- /* Check if the length of the hash is all right */
-
- 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;
- }
-
- /* Convert the hash to binary format */
-
- hex2bin(hishash, hishash, SHA_DIGEST_LENGTH);
-
- /* Calculate the hash from the challenge we sent */
-
- SHA1(cl->hischallenge, CHAL_LENGTH, myhash);
-
- /* Verify the incoming hash with the calculated hash */
-
- if(!memcmp(hishash, myhash, SHA_DIGEST_LENGTH))
- {
- syslog(LOG_ERR, _("Intruder: wrong challenge reply from %s (%s)"), cl->name, cl->hostname);
- free(hishash);
- return -1;
- }
-
- free(hishash);
-
- /* Identity has now been positively verified.
- If we are accepting this new connection, then send our identity,
- if we are making this connecting, acknowledge.
- */
-cp
- if(cl->status.outgoing)
- {
- cl->allow_request = ACK;
- return send_ack(cl);
- }
- else
- {
- cl->allow_request = CHALLENGE;
- return send_id(cl);
- }
-}
-
-int send_ack(conn_list_t *cl)
-{
-cp
- return send_request(cl, "%d", ACK);
-}
-
-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 name. 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);
+ syslog(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request], c->name, c->hostname);
}
- /* 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 */
-
-/* FIXME: reprogram this.
- notify_others(cl, NULL, send_add_host);
- notify_one(cl);
-*/
- upstreamindex = 0;
-
+ buffer[len++] = '\n';
cp
- if(cl->status.outgoing)
- return 0;
+ if(c == broadcast)
+ return broadcast_meta(NULL, buffer, len);
else
- return send_ack(cl);
+ return send_meta(c, buffer, len);
}
-/* Address and subnet information exchange */
-
-int send_add_subnet(conn_list_t *cl, conn_list_t *other, subnet_t *subnet)
+int forward_request(connection_t *from)
{
- int x;
- char *netstr;
-cp
- x = send_request(cl, "%d %s %s", ADD_SUBNET,
- other->name, netstr = net2str(subnet));
- free(netstr);
-cp
- return x;
-}
-
-int add_subnet_h(conn_list_t *cl)
-{
- char *subnetstr;
- char *name;
- conn_list_t *owner;
- subnet_t *subnet, *old;
-cp
- if(sscanf(cl->buffer, "%*d %as %as", &name, &subnetstr) != 3)
- {
- syslog(LOG_ERR, _("Got bad ADD_SUBNET from %s (%s)"), cl->name, cl->hostname);
- free(name); free(subnetstr);
- return -1;
- }
-
- /* Check if owner name is a valid */
-
- if(!check_id(name))
- {
- syslog(LOG_ERR, _("Got bad ADD_SUBNET from %s (%s): invalid identity name"), cl->name, cl->hostname);
- free(name); free(subnetstr);
- return -1;
- }
-
- /* Check if subnet string is valid */
-
- if(!(subnet = str2net(subnetstr)))
- {
- syslog(LOG_ERR, _("Got bad ADD_SUBNET from %s (%s): invalid subnet string"), cl->name, cl->hostname);
- free(name); free(subnetstr);
- return -1;
- }
-
- free(subnetstr);
-
- /* Check if somebody tries to add a subnet of ourself */
-
- if(!strcmp(name, myself->name))
- {
- syslog(LOG_ERR, _("Warning: got ADD_SUBNET from %s (%s) for ourself, restarting"),
- cl->name, cl->hostname);
- free(name);
- sighup = 1;
- return 0;
- }
-
- /* Check if the owner of the new subnet is in the connection list */
-
- if(!(owner = lookup_id(name)))
- {
- syslog(LOG_ERR, _("Got ADD_SUBNET for %s from %s (%s) which is not in our connection list"),
- name, cl->name, cl->hostname);
- free(name);
- return -1;
- }
-
- /* If everything is correct, add the subnet to the list of the owner */
-
- subnet_add(owner, subnet);
-cp
- return 0;
-}
-
-int send_del_subnet(conn_list_t *cl, conn_list_t *other, subnet_t *subnet)
-{
-cp
- return send_request(cl, "%d %s %s", DEL_SUBNET, other->name, net2str(subnet));
-}
-
-int del_subnet_h(conn_list_t *cl)
-{
- char *subnetstr;
- char *name;
- conn_list_t *owner;
- subnet_t *subnet, *old;
+ int request;
cp
- if(sscanf(cl->buffer, "%*d %as %as", &name, &subnetstr) != 3)
- {
- syslog(LOG_ERR, _("Got bad DEL_SUBNET from %s (%s)"), cl->name, cl->hostname);
- free(name); free(subnetstr);
- return -1;
- }
-
- /* Check if owner name is a valid */
-
- if(!check_id(name))
- {
- syslog(LOG_ERR, _("Got bad DEL_SUBNET from %s (%s): invalid identity name"), cl->name, cl->hostname);
- free(name); free(subnetstr);
- return -1;
- }
-
- /* Check if subnet string is valid */
-
- if(!(subnet = str2net(subnetstr)))
- {
- syslog(LOG_ERR, _("Got bad DEL_SUBNET from %s (%s): invalid subnet string"), cl->name, cl->hostname);
- free(name); free(subnetstr);
- return -1;
- }
-
- free(subnetstr);
-
- /* Check if somebody tries to add a subnet of ourself */
-
- if(!strcmp(name, myself->name))
- {
- syslog(LOG_ERR, _("Warning: got DEL_SUBNET from %s (%s) for ourself, restarting"),
- cl->name, cl->hostname);
- free(name);
- sighup = 1;
- return 0;
- }
-
- /* Check if the owner of the new subnet is in the connection list */
-
- if(!(owner = lookup_id(name)))
+ if(debug_lvl >= DEBUG_PROTOCOL)
{
- syslog(LOG_ERR, _("Got DEL_SUBNET for %s from %s (%s) which is not in our connection list"),
- name, cl->name, cl->hostname);
- free(name);
- return -1;
+ sscanf(from->buffer, "%d", &request);
+ if(debug_lvl >= DEBUG_META)
+ syslog(LOG_DEBUG, _("Broadcasting %s from %s (%s): %s"), request_name[request], from->name, from->hostname, from->buffer);
+ else
+ syslog(LOG_DEBUG, _("Broadcasting %s from %s (%s)"), request_name[request], from->name, from->hostname);
}
- /* If everything is correct, delete the subnet from the list of the owner */
-
- subnet_del(subnet);
-cp
- return 0;
-}
-
-/* New and closed connections notification */
-
-int send_add_host(conn_list_t *cl, conn_list_t *other)
-{
+ from->buffer[from->reqlen - 1] = '\n';
cp
- return send_request(cl, "%d %s %s %lx:%d %lx", ADD_HOST,
- myself->name, other->name, other->address, other->port, other->options);
+ return broadcast_meta(from, from->buffer, from->reqlen);
}
-int add_host_h(conn_list_t *cl)
+int receive_request(connection_t *c)
{
- char *sender;
- conn_list_t *old, *new, *hisuplink;
+ int request;
cp
- new = new_conn_list();
-
- 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 identity is a valid name */
-
- if(!check_id(new->name) || !check_id(sender))
- {
- syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s): invalid identity name"), cl->name, cl->hostname);
- free(sender);
- 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;
- free(sender);
- return 0;
- }
-
- /* We got an ADD_HOST from ourself!? */
-
- if(!strcmp(sender, myself->name))
+ if(sscanf(c->buffer, "%d", &request) == 1)
{
- syslog(LOG_ERR, _("Warning: got ADD_HOST from %s (%s) from ourself, restarting"), cl->name, cl->hostname);
- sighup = 1;
- free(sender);
- return 0;
- }
-
- /* Lookup his uplink */
-
- if(!(new->hisuplink = lookup_id(sender)))
- {
- syslog(LOG_ERR, _("Got ADD_HOST from %s (%s) with origin %s which is not in our connection list"),
- sender, cl->name, cl->hostname);
- free(sender);
- return -1;
- }
-
- free(sender);
-
- /* Fill in more of the new conn_list structure */
-
- new->hostname = hostlookup(htonl(new->address));
-
- /* Check if the new host already exists in the connnection list */
-
- if((old = lookup_id(new->name)))
- {
- if((new->address == old->address) && (new->port == old->port))
+ if((request < 0) || (request >= LAST) || (request_handlers[request] == NULL))
{
- 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;
+ if(debug_lvl >= DEBUG_META)
+ syslog(LOG_DEBUG, _("Unknown request from %s (%s): %s"),
+ c->name, c->hostname, c->buffer);
+ else
+ syslog(LOG_ERR, _("Unknown request from %s (%s)"),
+ c->name, c->hostname);
+
+ return -1;
}
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->myuplink = 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 */
-/* FIXME: reprogram this.
- notify_others(new, cl, send_add_host);
-*/
-cp
- return 0;
-}
-
-int send_del_host(conn_list_t *cl, conn_list_t *other)
-{
-cp
- return send_request(cl, "%d %s %s %lx:%d %lx", DEL_HOST,
- myself->name, other->name, other->address, other->port, other->options);
-}
-
-int del_host_h(conn_list_t *cl)
-{
- char *name;
- char *sender;
- ip_t address;
- port_t port;
- int options;
- conn_list_t *old, *hisuplink;
-
-cp
- 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 identity is a valid name */
-
- if(!check_id(name) || !check_id(sender))
- {
- syslog(LOG_ERR, _("Got bad DEL_HOST from %s (%s): invalid identity name"), cl->name, cl->hostname);
- free(name); free(sender);
- return -1;
- }
-
- /* Check if somebody tries to delete ourself */
-
- if(!strcmp(name, myself->name))
- {
- syslog(LOG_ERR, _("Warning: got DEL_HOST from %s (%s) for ourself, restarting"),
- cl->name, cl->hostname);
- free(name); free(sender);
- sighup = 1;
- return 0;
- }
-
- /* We got an ADD_HOST from ourself!? */
-
- if(!strcmp(sender, myself->name))
- {
- syslog(LOG_ERR, _("Warning: got DEL_HOST from %s (%s) from ourself, restarting"), cl->name, cl->hostname);
- sighup = 1;
- free(name); free(sender);
- return 0;
- }
+ if(debug_lvl >= DEBUG_PROTOCOL)
+ {
+ if(debug_lvl >= DEBUG_META)
+ syslog(LOG_DEBUG, _("Got %s from %s (%s): %s"),
+ request_name[request], c->name, c->hostname, c->buffer);
+ else
+ syslog(LOG_DEBUG, _("Got %s from %s (%s)"),
+ request_name[request], c->name, c->hostname);
+ }
+ }
- /* Lookup his uplink */
+ if((c->allow_request != ALL) && (c->allow_request != request))
+ {
+ syslog(LOG_ERR, _("Unauthorized request from %s (%s)"), c->name, c->hostname);
+ return -1;
+ }
- if(!(hisuplink = lookup_id(sender)))
- {
- syslog(LOG_ERR, _("Got DEL_HOST from %s (%s) with origin %s which is not in our connection list"),
- cl->name, cl->hostname, sender);
- free(name); free(sender);
- return -1;
+ if(request_handlers[request](c))
+ /* Something went wrong. Probably scriptkiddies. Terminate. */
+ {
+ syslog(LOG_ERR, _("Error while processing %s from %s (%s)"),
+ request_name[request], c->name, c->hostname);
+ return -1;
+ }
}
-
- free(sender);
-
- /* Check if the new host already exists in the connnection list */
-
- if(!(old = lookup_id(name)))
+ else
{
- syslog(LOG_ERR, _("Got DEL_HOST from %s (%s) for %s which is not in our connection list"),
- name, cl->name, cl->hostname);
- free(name);
+ syslog(LOG_ERR, _("Bogus data received from %s (%s)"),
+ c->name, c->hostname);
return -1;
}
-
- /* Check if the rest matches */
-
- if(address!=old->address || port!=old->port || options!=old->options || hisuplink!=old->hisuplink || cl!=old->myuplink)
- {
- syslog(LOG_WARNING, _("Got DEL_HOST from %s (%s) for %s which doesn't match"), cl->name, cl->hostname, old->name);
- return 0;
- }
-
- /* Ok, since EVERYTHING seems to check out all right, delete it */
-
- old->status.termreq = 1;
- old->status.active = 0;
-
- terminate_connection(old);
cp
return 0;
}
-/* Status and error notification routines */
-
-int send_status(conn_list_t *cl, int statusno, char *statusstring)
+int past_request_compare(past_request_t *a, past_request_t *b)
{
cp
- if(!statusstring)
- statusstring = status_text[statusno];
-cp
- return send_request(cl, "%d %d %s", STATUS, statusno, statusstring);
+ return strcmp(a->request, b->request);
}
-int status_h(conn_list_t *cl)
+void free_past_request(past_request_t *r)
{
- 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->name, 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);
- }
-
+ if(r->request)
+ free(r->request);
+ free(r);
cp
- free(statusstring);
- return 0;
}
-int send_error(conn_list_t *cl, int errno, char *errstring)
+void init_requests(void)
{
cp
- if(!errstring)
- errstring = strerror(errno);
- return send_request(cl, "%d %d %s", ERROR, errno, errstring);
-}
-
-int error_h(conn_list_t *cl)
-{
- 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, strerror(errno), errorstring);
- }
-
- free(errorstring);
- cl->status.termreq = 1;
- terminate_connection(cl);
-cp
- return 0;
-}
-
-int send_termreq(conn_list_t *cl)
-{
+ past_request_tree = avl_alloc_tree((avl_compare_t)past_request_compare, (avl_action_t)free_past_request);
cp
- return send_request(cl, "%d", TERMREQ);
}
-int termreq_h(conn_list_t *cl)
+void exit_requests(void)
{
cp
- cl->status.termreq = 1;
- terminate_connection(cl);
-cp
- return 0;
-}
-
-/* Keepalive routines - FIXME: needs a closer look */
-
-int send_ping(conn_list_t *cl)
-{
- cl->status.pinged = 1;
-cp
- return send_request(cl, "%d", PING);
-}
-
-int ping_h(conn_list_t *cl)
-{
-cp
- return send_pong(cl);
-}
-
-int send_pong(conn_list_t *cl)
-{
-cp
- return send_request(cl, "%d", PONG);
-}
-
-int pong_h(conn_list_t *cl)
-{
-cp
- cl->status.got_pong = 1;
-cp
- return 0;
-}
-
-/* Key exchange */
-
-int send_key_changed(conn_list_t *from, conn_list_t *cl)
-{
- 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;
-}
-
-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->name, 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)
-{
+ avl_delete_tree(past_request_tree);
cp
- return send_request(to->nexthop, "%d %s %s", REQ_KEY,
- from->name, to->name);
}
-int req_key_h(conn_list_t *cl)
+int seen_request(char *request)
{
- char *from_id, *to_id;
- conn_list_t *from, *to;
+ past_request_t p, *new;
cp
- if(sscanf(cl->buffer, "%*d %as %as", &from_id, &to_id) != 2)
- {
- syslog(LOG_ERR, _("Got bad REQ_KEY from %s (%s)"),
- cl->name, 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->name, cl->hostname, from_id);
- free(from_id); free(to_id);
- return -1;
- }
+ p.request = request;
- /* Check if this key request is for us */
-
- if(!strcmp(to_id, myself->name))
+ if(avl_search(past_request_tree, &p))
{
- send_ans_key(myself, from, myself->cipher_pktkey);
+ if(debug_lvl >= DEBUG_SCARY_THINGS)
+ syslog(LOG_DEBUG, _("Already seen request"));
+ return 1;
}
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->name, cl->hostname, to_id);
- free(from_id); free(to_id);
- return -1;
- }
- send_req_key(from, to);
+ new = (past_request_t *)xmalloc(sizeof(*new));
+ new->request = xstrdup(request);
+ new->firstseen = now;
+ avl_insert(past_request_tree, new);
+ return 0;
}
-
- free(from_id); free(to_id);
-cp
- return 0;
-}
-
-int send_ans_key(conn_list_t *from, conn_list_t *to, char *pktkey)
-{
-cp
- return send_request(to->nexthop, "%d %s %s %s", ANS_KEY,
- from->name, to->name, pktkey);
+cp
}
-int ans_key_h(conn_list_t *cl)
+void age_past_requests(void)
{
- char *from_id, *to_id, *pktkey;
- int keylength;
- conn_list_t *from, *to;
-cp
- if(sscanf(cl->buffer, "%*d %as %as %as", &from_id, &to_id, &pktkey) != 3)
+ avl_node_t *node, *next;
+ past_request_t *p;
+ int left = 0, deleted = 0;
+cp
+ for(node = past_request_tree->head; node; node = next)
{
- syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s)"),
- cl->name, 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->name, cl->hostname, from_id);
- free(from_id); free(to_id); free(pktkey);
- return -1;
- }
-
- /* Check if this key request is for us */
-
- if(!strcmp(to_id, myself->name))
- {
- /* It is for us, convert it to binary and set the key with it. */
-
- keylength = strlen(pktkey);
-
- if((keylength%2) || (keylength <= 0))
- {
- syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s) origin %s: invalid key"),
- cl->name, cl->hostname, from->name);
- free(from_id); free(to_id); free(pktkey);
- return -1;
- }
- keylength /= 2;
- hex2bin(pktkey, pktkey, keylength);
- BF_set_key(cl->cipher_pktkey, keylength, pktkey);
- }
- 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->name, cl->hostname, to_id);
- free(from_id); free(to_id); free(pktkey);
- return -1;
- }
- send_ans_key(from, to, pktkey);
+ next = node->next;
+ p = (past_request_t *)node->data;
+ if(p->firstseen + pingtimeout < now)
+ avl_delete_node(past_request_tree, node), deleted++;
+ else
+ left++;
}
- free(from_id); free(to_id); free(pktkey);
+ if(debug_lvl >= DEBUG_SCARY_THINGS && left + deleted)
+ syslog(LOG_DEBUG, _("Aging past requests: deleted %d, left %d\n"), deleted, left);
cp
- return 0;
}
/* Jumptable for the request handlers */
-int (*request_handlers[])(conn_list_t*) = {
- id_h, challenge_h, chal_reply_h, ack_h,
+int (*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_host_h, del_host_h,
add_subnet_h, del_subnet_h,
+ add_edge_h, del_edge_h,
key_changed_h, req_key_h, ans_key_h,
+ tcppacket_h,
};
/* Request names */
char (*request_name[]) = {
- "ID", "CHALLENGE", "CHAL_REPLY", "ACK",
+ "ID", "METAKEY", "CHALLENGE", "CHAL_REPLY", "ACK",
"STATUS", "ERROR", "TERMREQ",
"PING", "PONG",
- "ADD_HOST", "DEL_HOST",
"ADD_SUBNET", "DEL_SUBNET",
+ "ADD_EDGE", "DEL_EDGE",
"KEY_CHANGED", "REQ_KEY", "ANS_KEY",
-};
-
-/* Status strings */
-
-char (*status_text[]) = {
- "FIXME: status text",
-};
-
-/* Error strings */
-
-char (*error_text[]) = {
- "FIXME: error text",
+ "PACKET",
};
projects / tinc / blobdiff