/*
- 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 <itimmermans@bigfoot.com>,
+ 2000,2001 Guus Sliepen <guus@sliepen.warande.net>
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 1.28.4.52 2000/10/29 22:10:43 guus Exp $
+ $Id: protocol.c,v 1.28.4.123 2002/02/27 22:37:54 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 <openssl/rand.h>
-#include <openssl/evp.h>
#include "conf.h"
-#include "net.h"
-#include "netutl.h"
#include "protocol.h"
#include "meta.h"
-#include "connlist.h"
+#include "connection.h"
#include "system.h"
for (i = 0; i < strlen(id); i++)
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 send_request(connection_t *c, const char *format, ...)
{
va_list args;
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, format);
len = vsnprintf(buffer, MAXBUFSIZE, format, args);
- request = va_arg(args, int);
va_end(args);
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)"), request_name[request], c->name, c->hostname);
return -1;
}
- len++;
-
if(debug_lvl >= DEBUG_PROTOCOL)
- syslog(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request], cl->name, cl->hostname);
+ {
+ 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
+ syslog(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request], c->name, c->hostname);
+ }
+ buffer[len++] = '\n';
cp
- return send_meta(cl, buffer, len);
+ return send_meta(c, buffer, len);
}
-int receive_request(conn_list_t *cl)
+int receive_request(connection_t *c)
{
int request;
-cp
- if(sscanf(cl->buffer, "%d", &request) == 1)
+cp
+ if(sscanf(c->buffer, "%d", &request) == 1)
{
- if((request < 0) || (request > 255) || (request_handlers[request] == NULL))
+ if((request < 0) || (request >= LAST) || (request_handlers[request] == NULL))
{
- syslog(LOG_ERR, _("Unknown request from %s (%s)"),
- cl->name, cl->hostname);
+ 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_PROTOCOL)
- syslog(LOG_DEBUG, _("Got %s from %s (%s)"),
- request_name[request], cl->name, cl->hostname);
+ {
+ 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);
+ }
}
- if((cl->allow_request != ALL) && (cl->allow_request != request))
+ if((c->allow_request != ALL) && (c->allow_request != request))
{
- syslog(LOG_ERR, _("Unauthorized request from %s (%s)"), cl->name, cl->hostname);
+ syslog(LOG_ERR, _("Unauthorized request from %s (%s)"), c->name, c->hostname);
return -1;
}
- if(request_handlers[request](cl))
+ if(request_handlers[request](c))
/* Something went wrong. Probably scriptkiddies. Terminate. */
{
syslog(LOG_ERR, _("Error while processing %s from %s (%s)"),
- request_name[request], cl->name, cl->hostname);
+ request_name[request], c->name, c->hostname);
return -1;
}
}
else
{
syslog(LOG_ERR, _("Bogus data received from %s (%s)"),
- cl->name, cl->hostname);
- return -1;
- }
-cp
- return 0;
-}
-
-/* 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
- cl->allow_request = CHALLENGE;
-cp
- return send_request(cl, "%d %s %d %lx %hd", ID, myself->name, myself->protocol_version, myself->options, myself->port);
-}
-
-int id_h(conn_list_t *cl)
-{
- conn_list_t *old;
- config_t *cfg;
-cp
- if(sscanf(cl->buffer, "%*d %as %d %lx %hd", &cl->name, &cl->protocol_version, &cl->options, &cl->port) != 4)
- {
- 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 */
-cp
- 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.
- */
-cp
- 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;
- }
- }
-cp
- if((cfg = get_config_val(cl->config, publickey)))
- {
- cl->rsa_key = RSA_new();
- BN_hex2bn(&cl->rsa_key->n, cfg->data.ptr);
- BN_hex2bn(&cl->rsa_key->e, "FFFF");
- }
- else
- {
- syslog(LOG_ERR, _("No public key known for %s (%s)"), cl->name, cl->hostname);
- return -1;
- }
-cp
- return send_challenge(cl);
-}
-
-int send_challenge(conn_list_t *cl)
-{
- char *buffer;
- int len, x;
-cp
- len = RSA_size(cl->rsa_key);
-
- /* Allocate buffers for the challenge */
-
- buffer = xmalloc(len*2+1);
-
- if(cl->hischallenge)
- free(cl->hischallenge);
-
- cl->hischallenge = xmalloc(len);
-cp
- /* Seed the PRNG with urandom (can't afford to block) */
-
- RAND_load_file("/dev/urandom", 1024);
-
- /* Copy random data to the buffer */
-
- RAND_bytes(cl->hischallenge, len);
-
- cl->hischallenge[0] &= 0x7F; /* Somehow if the first byte is more than 0xD0 or something like that, decryption fails... */
-
- if(debug_lvl >= DEBUG_SCARY_THINGS)
- {
- bin2hex(cl->hischallenge, buffer, len);
- buffer[len*2] = '\0';
- syslog(LOG_DEBUG, _("Generated random challenge (unencrypted): %s"), buffer);
- }
-
- /* Encrypt the random data */
-
- if(RSA_public_encrypt(len, cl->hischallenge, buffer, cl->rsa_key, RSA_NO_PADDING) != len) /* NO_PADDING because the message size equals the RSA key size and it is totally random */
- {
- syslog(LOG_ERR, _("Error during encryption of challenge for %s (%s)"), cl->name, cl->hostname);
- free(buffer);
- return -1;
- }
-cp
- /* Convert the encrypted random data to a hexadecimal formatted string */
-
- bin2hex(buffer, buffer, len);
- buffer[len*2] = '\0';
-
- /* Send the challenge */
-
- cl->allow_request = CHAL_REPLY;
- x = send_request(cl, "%d %s", CHALLENGE, buffer);
- free(buffer);
-cp
- return x;
-}
-
-int challenge_h(conn_list_t *cl)
-{
- char *buffer;
- int len;
-cp
- if(sscanf(cl->buffer, "%*d %as", &buffer) != 1)
- {
- syslog(LOG_ERR, _("Got bad CHALLENGE from %s (%s)"), cl->name, cl->hostname);
- return -1;
- }
-
- len = RSA_size(myself->rsa_key);
-
- /* Check if the length of the challenge is all right */
-
- if(strlen(buffer) != len*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(len);
-
- /* Convert the challenge from hexadecimal back to binary */
-
- hex2bin(buffer,buffer,len);
-
- /* Decrypt the challenge */
-
- if(RSA_private_decrypt(len, buffer, cl->mychallenge, myself->rsa_key, RSA_NO_PADDING) != len) /* See challenge() */
- {
- syslog(LOG_ERR, _("Error during encryption of challenge for %s (%s)"), cl->name, cl->hostname);
- free(buffer);
- return -1;
- }
-
- if(debug_lvl >= DEBUG_SCARY_THINGS)
- {
- bin2hex(cl->mychallenge, buffer, len);
- buffer[len*2] = '\0';
- syslog(LOG_DEBUG, _("Received random challenge (unencrypted): %s"), buffer);
- }
-
- 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, RSA_size(myself->rsa_key), 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) != 1)
- {
- 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, RSA_size(cl->rsa_key), 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);
- if(debug_lvl >= DEBUG_SCARY_THINGS)
- {
- bin2hex(myhash, hishash, SHA_DIGEST_LENGTH);
- hishash[SHA_DIGEST_LENGTH*2] = '\0';
- syslog(LOG_DEBUG, _("Expected challenge reply: %s"), hishash);
- }
- 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)
- return send_ack(cl);
- else
- return send_id(cl);
-}
-
-int send_ack(conn_list_t *cl)
-{
-cp
- if(cl->status.outgoing)
- cl->allow_request = ACK;
-cp
- return send_request(cl, "%d", ACK);
-}
-
-int ack_h(conn_list_t *cl)
-{
- conn_list_t *old, *p;
- subnet_t *s;
-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);
-
- terminate_connection(old);
- }
-
- /* Activate this connection */
-
- cl->allow_request = ALL;
- cl->status.active = 1;
- cl->nexthop = cl;
- cl->cipher_pkttype = EVP_bf_cfb();
- cl->cipher_pktkeylength = cl->cipher_pkttype->key_len + cl->cipher_pkttype->iv_len;
-
- if(debug_lvl >= DEBUG_CONNECTIONS)
- syslog(LOG_NOTICE, _("Connection with %s (%s) activated"), cl->name, cl->hostname);
-
-cp
- if(!cl->status.outgoing)
- send_ack(cl);
-
- /* Send him our subnets */
-
- for(s = myself->subnets; s; s = s->next)
- send_add_subnet(cl, s);
-
- /* And send him all the hosts and their subnets we know... */
-
- for(p = conn_list; p; p = p->next)
- if(p != cl && p->status.active)
- {
- /* Notify others of this connection */
-
- if(p->status.meta)
- send_add_host(p, cl);
-
- /* Notify new connection of everything we know */
-
- send_add_host(cl, p);
-
- for(s = p->subnets; s; s = s->next)
- send_add_subnet(cl, s);
- }
-cp
- return 0;
-}
-
-/* Address and subnet information exchange */
-
-int send_add_subnet(conn_list_t *cl, subnet_t *subnet)
-{
- int x;
- char *netstr;
-cp
- x = send_request(cl, "%d %s %s", ADD_SUBNET,
- subnet->owner->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, *p;
- subnet_t *subnet;
-cp
- if(sscanf(cl->buffer, "%*d %as %as", &name, &subnetstr) != 2)
- {
- 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);
-
- /* Tell the rest */
-
- for(p = conn_list; p; p = p->next)
- if(p->status.meta && p->status.active && p!= cl)
- send_add_subnet(p, subnet);
-cp
- return 0;
-}
-
-int send_del_subnet(conn_list_t *cl, subnet_t *subnet)
-{
- int x;
- char *netstr;
-cp
- netstr = net2str(subnet);
- x = send_request(cl, "%d %s %s", DEL_SUBNET, subnet->owner->name, netstr);
- free(netstr);
-cp
- return x;
-}
-
-int del_subnet_h(conn_list_t *cl)
-{
- char *subnetstr;
- char *name;
- conn_list_t *owner, *p;
- subnet_t *subnet;
-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)))
- {
- 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;
- }
-
- /* If everything is correct, delete the subnet from the list of the owner */
-
- subnet_del(subnet);
-
- /* Tell the rest */
-
- for(p = conn_list; p; p = p->next)
- if(p->status.meta && p->status.active && p!= cl)
- send_del_subnet(p, subnet);
-cp
- return 0;
-}
-
-/* New and closed connections notification */
-
-int send_add_host(conn_list_t *cl, conn_list_t *other)
-{
-cp
- return send_request(cl, "%d %s %lx:%d %lx", ADD_HOST,
- other->name, other->address, other->port, other->options);
-}
-
-int add_host_h(conn_list_t *cl)
-{
- conn_list_t *old, *new;
- conn_list_t *p;
-cp
- new = new_conn_list();
-
- if(sscanf(cl->buffer, "%*d %as %lx:%d %lx", &new->name, &new->address, &new->port, &new->options) != 4)
- {
- 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))
- {
- syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s): invalid identity name"), cl->name, cl->hostname);
- free_conn_list(new);
- 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_conn_list(new);
- return 0;
- }
-
- /* 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(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);
- free_conn_list(new);
- return 0;
- }
- else
- {
- if(debug_lvl >= DEBUG_CONNECTIONS)
- syslog(LOG_NOTICE, _("Removing old entry for %s (%s) in favour of new connection"),
- old->name, old->hostname);
-
- terminate_connection(old);
- }
- }
-
- /* Hook it up into the conn_list */
-
- conn_list_add(new);
-
- /* Tell the rest about the new host */
-
- for(p = conn_list; p; p = p->next)
- if(p->status.meta && p->status.active && p!=cl)
- send_add_host(p, new);
-
- /* Fill in rest of conn_list structure */
-
- new->nexthop = cl;
- new->status.active = 1;
-
-cp
- return 0;
-}
-
-int send_del_host(conn_list_t *cl, conn_list_t *other)
-{
-cp
- return send_request(cl, "%d %s %lx:%d %lx", DEL_HOST,
- other->name, other->address, other->port, other->options);
-}
-
-int del_host_h(conn_list_t *cl)
-{
- char *name;
- ip_t address;
- port_t port;
- long int options;
- conn_list_t *old, *p;
-cp
- if(sscanf(cl->buffer, "%*d %as %lx:%d %lx", &name, &address, &port, &options) != 4)
- {
- 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))
- {
- syslog(LOG_ERR, _("Got bad DEL_HOST from %s (%s): invalid identity name"), cl->name, cl->hostname);
- free(name);
- 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);
- sighup = 1;
- return 0;
- }
-
- /* Check if the new host already exists in the connnection list */
-
- if(!(old = lookup_id(name)))
- {
- 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);
- return -1;
- }
-
- /* Check if the rest matches */
-
- if(address!=old->address || port!=old->port || options!=old->options || cl!=old->nexthop)
- {
- 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.active = 0;
- terminate_connection(old);
-
- /* Tell the rest about the new host */
-
- for(p = conn_list; p; p = p->next)
- if(p->status.meta && p->status.active && p!=cl)
- send_del_host(p, old);
-cp
- return 0;
-}
-
-/* Status and error notification routines */
-
-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);
-}
-
-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->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);
- }
-
-cp
- free(statusstring);
- return 0;
-}
-
-int send_error(conn_list_t *cl, int errno, char *errstring)
-{
-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);
- terminate_connection(cl);
-cp
- return 0;
-}
-
-int send_termreq(conn_list_t *cl)
-{
-cp
- return send_request(cl, "%d", TERMREQ);
-}
-
-int termreq_h(conn_list_t *cl)
-{
-cp
- 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)
-{
-cp
- return send_request(to->nexthop, "%d %s %s", REQ_KEY,
- from->name, to->name);
-}
-
-int req_key_h(conn_list_t *cl)
-{
- char *from_id, *to_id;
- conn_list_t *from, *to;
- char pktkey[129];
-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;
- }
-
- /* Check if this key request is for us */
-
- if(!strcmp(to_id, myself->name))
- {
- bin2hex(myself->cipher_pktkey, pktkey, myself->cipher_pktkeylength);
- pktkey[myself->cipher_pktkeylength*2] = '\0';
- send_ans_key(myself, from, pktkey);
- }
- 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;
- }
-
- if(to->status.validkey) /* Proxy keys */
- {
- bin2hex(to->cipher_pktkey, pktkey, to->cipher_pktkeylength);
- pktkey[to->cipher_pktkeylength*2] = '\0';
- send_ans_key(to, from, pktkey);
- }
- else
- send_req_key(from, to);
- }
-
- 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);
-}
-
-int ans_key_h(conn_list_t *cl)
-{
- 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)
- {
- 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;
- }
-
- /* Update origin's packet key */
-
- keylength = strlen(pktkey);
-
- if(keylength != from->cipher_pktkeylength*2)
- {
- syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s) origin %s: invalid key length"),
- cl->name, cl->hostname, from->name);
- free(from_id); free(to_id); free(pktkey);
+ c->name, c->hostname);
return -1;
}
-
- if(from->cipher_pktkey)
- free(from->cipher_pktkey);
-
- keylength /= 2;
- hex2bin(pktkey, pktkey, keylength);
- pktkey[keylength] = '\0';
- from->cipher_pktkey = pktkey;
-
- from->status.validkey = 1;
- from->status.waitingforkey = 0;
-
- if(strcmp(to_id, myself->name))
- {
- 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);
- return -1;
- }
- send_ans_key(from, to, pktkey);
- }
-
- free(from_id); free(to_id);
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_node_h, del_node_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_NODE", "DEL_NODE",
"ADD_SUBNET", "DEL_SUBNET",
+ "ADD_EDGE", "DEL_EDGE",
"KEY_CHANGED", "REQ_KEY", "ANS_KEY",
-};
-
-/* Status strings */
-
-char (*status_text[]) = {
- "Warning",
-};
-
-/* Error strings */
-
-char (*error_text[]) = {
- "Error",
+ "PACKET",
};
projects / tinc / blobdiff