/*
- protocol.c -- handle the meta-protocol
- Copyright (C) 1999 Ivo Timmermans <zarq@iname.com>
+ 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
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ $Id: protocol.c,v 1.28.4.132 2002/09/04 13:48:52 guus Exp $
*/
#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 <stdarg.h>
+#include <errno.h>
#include <utils.h>
#include <xalloc.h>
#include "conf.h"
-#include "encr.h"
-#include "net.h"
-#include "netutl.h"
#include "protocol.h"
+#include "meta.h"
+#include "connection.h"
-int send_ack(conn_list_t *cl)
-{
- unsigned char tmp = ACK;
-cp
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, "Send ACK to %s", cl->hostname);
-
- syslog(LOG_NOTICE, "Connection with %s activated.", cl->hostname);
- if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 0)
- {
- syslog(LOG_ERR, "send failed: %d:%d: %m", __FILE__, __LINE__);
- return -1;
- }
-cp
- return 0;
-}
-
-int send_termreq(conn_list_t *cl)
-{
- termreq_t tmp;
-cp
- memset(&tmp, 0, sizeof(tmp));
- tmp.type = TERMREQ;
- tmp.vpn_ip = myself->vpn_ip;
-
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, "Send TERMREQ(" IP_ADDR_S ") to " IP_ADDR_S, IP_ADDR_V(tmp.vpn_ip),
- IP_ADDR_V(cl->vpn_ip));
-
- if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 0)
- {
- syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
- return -1;
- }
-cp
- return 0;
-}
-
-int send_timeout(conn_list_t *cl)
-{
- termreq_t tmp;
-cp
- memset(&tmp, 0, sizeof(tmp));
- tmp.type = PINGTIMEOUT;
- tmp.vpn_ip = myself->vpn_ip;
-
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, "Send TIMEOUT(" IP_ADDR_S ") to " IP_ADDR_S, IP_ADDR_V(tmp.vpn_ip),
- IP_ADDR_V(cl->vpn_ip));
-
- if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 0)
- {
- syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
- return -1;
- }
-cp
- return 0;
-}
-
-int send_del_host(conn_list_t *cl, conn_list_t *new_host)
-{
- del_host_t tmp;
-cp
- memset(&tmp, 0, sizeof(tmp));
- tmp.type = DEL_HOST;
- tmp.vpn_ip = new_host->vpn_ip;
-
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, "Sending delete host %lx to " IP_ADDR_S,
- tmp.vpn_ip, IP_ADDR_V(cl->vpn_ip));
-
- if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 0)
- {
- syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
- return -1;
- }
-cp
- return 0;
-}
-
-int send_ping(conn_list_t *cl)
-{
- unsigned char tmp = PING;
-cp
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, "pinging " IP_ADDR_S, IP_ADDR_V(cl->vpn_ip));
-
- if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 0)
- {
- syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
- return -1;
- }
-cp
- return 0;
-}
-
-int send_pong(conn_list_t *cl)
-{
- unsigned char tmp = PONG;
-cp
- if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 0)
- {
- syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
- return -1;
- }
-cp
- return 0;
-}
+#include "system.h"
-int send_add_host(conn_list_t *cl, conn_list_t *new_host)
-{
- add_host_t tmp;
-cp
- memset(&tmp, 0, sizeof(tmp));
- tmp.type = ADD_HOST;
- tmp.real_ip = new_host->real_ip;
- tmp.vpn_ip = new_host->vpn_ip;
- tmp.vpn_mask = new_host->vpn_mask;
- tmp.portnr = new_host->port;
-
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, "Sending add host (%lx/%lx %lx:%hd) to " IP_ADDR_S,
- tmp.vpn_ip, tmp.vpn_mask, tmp.real_ip, tmp.portnr,
- IP_ADDR_V(cl->vpn_ip));
-
- if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 0)
- {
- syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
- return -1;
- }
-cp
- return 0;
-}
+avl_tree_t *past_request_tree;
-int send_key_changed(conn_list_t *cl, conn_list_t *src)
+int check_id(char *id)
{
- key_changed_t tmp;
-cp
- memset(&tmp, 0, sizeof(tmp));
- tmp.type = KEY_CHANGED;
- tmp.from = src->vpn_ip;
+ int i;
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, "Sending KEY_CHANGED (%lx) to " IP_ADDR_S,
- tmp.from, IP_ADDR_V(cl->vpn_ip));
-
- if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 0)
- {
- syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
+ for (i = 0; i < strlen(id); i++)
+ if(!isalnum(id[i]) && id[i] != '_')
return -1;
- }
-cp
- return 0;
-}
-
-void send_key_changed2(void)
-{
- conn_list_t *p;
-cp
- for(p = conn_list; p != NULL; p = p->next)
- if(p->status.meta && p->protocol_version > PROT_3)
- send_key_changed(p, myself);
-cp
-}
-
-int send_basic_info(conn_list_t *cl)
-{
- basic_info_t tmp;
-cp
- memset(&tmp, 0, sizeof(tmp));
- tmp.type = BASIC_INFO;
- tmp.protocol = PROT_CURRENT;
-
- tmp.portnr = myself->port;
- tmp.vpn_ip = myself->vpn_ip;
- tmp.vpn_mask = myself->vpn_mask;
-
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, "Send BASIC_INFO(%d,%hd," IP_ADDR_S "," IP_ADDR_S ") to " IP_ADDR_S,
- tmp.protocol, tmp.portnr, IP_ADDR_V(tmp.vpn_ip), IP_ADDR_V(tmp.vpn_mask),
- IP_ADDR_V(cl->real_ip));
-
- if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 0)
- {
- syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
- return -1;
- }
-cp
- return 0;
-}
-
-int send_passphrase(conn_list_t *cl)
-{
- passphrase_t tmp;
-cp
- memset(&tmp, 0, sizeof(tmp));
- tmp.type = PASSPHRASE;
- encrypt_passphrase(&tmp);
-
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, "Send PASSPHRASE(%hd,...) to " IP_ADDR_S, tmp.len,
- IP_ADDR_V(cl->vpn_ip));
-
- if((write(cl->meta_socket, &tmp, tmp.len+3)) < 0)
- {
- syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
- return -1;
- }
-cp
- return 0;
-}
-
-int send_public_key(conn_list_t *cl)
-{
- public_key_t *tmp;
-cp
- tmp = (public_key_t*)xmalloc(strlen(my_public_key_base36)+sizeof(*tmp));
- memset(tmp, 0, sizeof(*tmp));
- tmp->type = PUBLIC_KEY;
- tmp->len = strlen(my_public_key_base36);
- strcpy(&tmp->key, my_public_key_base36);
-
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, "Send PUBLIC_KEY(%hd,%s) to " IP_ADDR_S, tmp->len, &tmp->key,
- IP_ADDR_V(cl->vpn_ip));
-
- if((write(cl->meta_socket, tmp, tmp->len+sizeof(*tmp))) < 0)
- {
- syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
- return -1;
- }
-cp
- return 0;
-}
-
-int send_calculate(conn_list_t *cl, char *k)
-{
- calculate_t *tmp;
-cp
- tmp = xmalloc(strlen(k)+sizeof(*tmp));
- memset(tmp, 0, sizeof(*tmp));
- tmp->type = CALCULATE;
- tmp->len = strlen(k);
- strcpy(&tmp->key, k);
-
- if((write(cl->meta_socket, tmp, tmp->len+sizeof(*tmp))) < 0)
- {
- syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
- return -1;
- }
-cp
- return 0;
-}
-
-int send_key_request(ip_t to)
-{
- key_req_t *tmp;
- conn_list_t *fw;
-cp
- tmp = xmalloc(sizeof(*tmp));
- memset(tmp, 0, sizeof(*tmp));
- tmp->type = REQ_KEY;
- tmp->to = to;
- tmp->from = myself->vpn_ip;
- tmp->len = 0;
-
- fw = lookup_conn(to);
- if(!fw)
- {
- syslog(LOG_ERR, "Attempting to send key request to " IP_ADDR_S ", which does not exist?",
- IP_ADDR_V(to));
- return -1;
- }
-
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, "Sending out request for public key to " IP_ADDR_S,
- IP_ADDR_V(fw->nexthop->vpn_ip));
- if(write(fw->nexthop->meta_socket, tmp, sizeof(*tmp)) < 0)
- {
- syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
- return -1;
- }
- fw->status.waitingforkey = 1;
-cp
- return 0;
-}
-
-int send_key_answer(conn_list_t *cl, ip_t to)
-{
- key_req_t *tmp;
- conn_list_t *fw;
-cp
- tmp = xmalloc(sizeof(*tmp)+strlen(my_public_key_base36));
- memset(tmp, 0, sizeof(*tmp));
- tmp->type = ANS_KEY;
- tmp->to = to;
- tmp->from = myself->vpn_ip;
- tmp->expiry = my_key_expiry;
- tmp->len = strlen(my_public_key_base36);
- strcpy(&(tmp->key), my_public_key_base36);
-
- fw = lookup_conn(to);
- if(!fw)
- {
- syslog(LOG_ERR, "Attempting to send key answer to " IP_ADDR_S ", which does not exist?",
- IP_ADDR_V(to));
- return -1;
- }
-
-cp
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, "Sending public key to " IP_ADDR_S,
- IP_ADDR_V(fw->nexthop->vpn_ip));
-cp
- if(write(fw->nexthop->meta_socket, tmp, sizeof(*tmp)+tmp->len) < 0)
- {
- syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
- return -1;
- }
-cp
return 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.
-*/
-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->protocol_version > PROT_3)
- function(p, new);
-cp
- return 0;
-}
+/* Generic request routines - takes care of logging and error
+ detection as well */
-/*
- notify one connection of everything
- i have connected
-*/
-int notify_one(conn_list_t *new)
+int send_request(connection_t *c, const char *format, ...)
{
- conn_list_t *p;
-cp
- for(p = conn_list; p != NULL; p = p->next)
- if(p != new && p->protocol_version > PROT_3)
- send_add_host(new, p);
-cp
- return 0;
-}
-
-/*
- The incoming request handlers
-*/
+ va_list args;
+ char buffer[MAXBUFSIZE];
+ int len, request;
-int basic_info_h(conn_list_t *cl)
-{
- basic_info_t tmp;
cp
- if(read(cl->meta_socket, &((char*)(&tmp))[1], sizeof(tmp)-1) <= 0)
- {
- syslog(LOG_ERR, "%d: Receive failed: %m", __LINE__);
- return -1;
- }
+ /* Use vsnprintf instead of vasprintf: faster, no memory
+ fragmentation, cleanup is automatic, and there is a limit on the
+ input buffer anyway */
- cl->protocol_version = tmp.protocol;
- cl->port = tmp.portnr;
- cl->vpn_ip = tmp.vpn_ip;
- cl->vpn_mask = tmp.vpn_mask;
+ va_start(args, format);
+ len = vsnprintf(buffer, MAXBUFSIZE, format, args);
+ va_end(args);
- if(cl->protocol_version < PROT_CURRENT)
+ if(len < 0 || len > MAXBUFSIZE-1)
{
- syslog(LOG_ERR, "Peer uses protocol version %d which is too old.",
- cl->protocol_version);
+ syslog(LOG_ERR, _("Output buffer overflow while sending request to %s (%s)"), c->name, c->hostname);
return -1;
}
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, "got BASIC_INFO(%hd," IP_ADDR_S "," IP_ADDR_S ")", cl->port,
- IP_ADDR_V(cl->vpn_ip), IP_ADDR_V(cl->vpn_mask));
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, "Peer uses protocol version %d",
- cl->protocol_version);
-
- if(cl->status.outgoing)
+ if(debug_lvl >= DEBUG_PROTOCOL)
{
- if(setup_vpn_connection(cl) < 0)
- return -1;
- send_basic_info(cl);
- }
- else
- {
- if(setup_vpn_connection(cl) < 0)
- return -1;
- send_passphrase(cl);
+ 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);
}
- cl->status.active = 0;
+ buffer[len++] = '\n';
cp
- return 0;
+ return send_meta(c, buffer, len);
}
-int passphrase_h(conn_list_t *cl)
+int receive_request(connection_t *c)
{
- char unused;
- unsigned short int len;
+ int request;
cp
- if(read(cl->meta_socket, &unused, sizeof(unused)) <= 0)
+ if(sscanf(c->buffer, "%d", &request) == 1)
{
- syslog(LOG_ERR, "%d: Receive failed: %m", __LINE__);
- return -1;
- }
-
- if(read(cl->meta_socket, &len, sizeof(len)) <= 0)
- {
- syslog(LOG_ERR, "%d: Receive failed: %m", __LINE__);
- return -1;
- }
-
- cl->pp = xmalloc(len+4);
+ if((request < 0) || (request >= LAST) || (request_handlers[request] == NULL))
+ {
+ 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)
+ {
+ 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((c->allow_request != ALL) && (c->allow_request != request))
+ {
+ syslog(LOG_ERR, _("Unauthorized request from %s (%s)"), c->name, c->hostname);
+ return -1;
+ }
- cl->pp->len = len;
- if(read(cl->meta_socket, &(cl->pp->phrase), len) <= 0)
- {
- syslog(LOG_ERR, "%d: Receive failed: %m", __LINE__);
- 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;
+ }
}
-
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, "got PASSPHRASE(%hd,...)", len);
-
- 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;
- unsigned short int len;
- char unused;
-cp
- if(read(cl->meta_socket, &unused, sizeof(unused)) <= 0)
- {
- syslog(LOG_ERR, "%d: Receive failed: %m", __LINE__);
- return -1;
- }
- if(read(cl->meta_socket, &len, sizeof(len)) <= 0)
- {
- syslog(LOG_ERR, "%d: Receive failed: %m", __LINE__);
- return -1;
- }
-
- g_n = xmalloc(len+2);
-
- if(read(cl->meta_socket, g_n, len+2) <= 0)
{
- syslog(LOG_ERR, "%d: Receive failed: %m", __LINE__);
+ syslog(LOG_ERR, _("Bogus data received from %s (%s)"),
+ c->name, c->hostname);
return -1;
}
-
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, "got PUBLIC_KEY(%hd,%s)", len, g_n);
-
- if(verify_passphrase(cl, g_n))
- {
- /* intruder! */
- syslog(LOG_ERR, "Intruder: passphrase does not match.");
- return -1;
- }
-
- if(debug_lvl > 2)
- syslog(LOG_INFO, "Passphrase OK");
-
- if(cl->status.outgoing)
- send_public_key(cl);
- else
- send_ack(cl);
-
- cl->status.active = 1;
- notify_others(cl, NULL, send_add_host);
- notify_one(cl);
-cp
- return 0;
-}
-
-int ack_h(conn_list_t *cl)
-{
-cp
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, "got ACK");
-
- cl->status.active = 1;
- syslog(LOG_NOTICE, "Connection with %s activated.", cl->hostname);
cp
return 0;
}
-int termreq_h(conn_list_t *cl)
+int past_request_compare(past_request_t *a, past_request_t *b)
{
cp
- syslog(LOG_NOTICE, IP_ADDR_S " wants to quit", IP_ADDR_V(cl->vpn_ip));
- cl->status.termreq = 1;
- terminate_connection(cl);
-
- notify_others(cl, NULL, send_del_host);
-cp
- return 0;
+ return strcmp(a->request, b->request);
}
-int timeout_h(conn_list_t *cl)
+void free_past_request(past_request_t *r)
{
cp
- syslog(LOG_NOTICE, IP_ADDR_S " says it's gotten a timeout from us", IP_ADDR_V(cl->vpn_ip));
- cl->status.termreq = 1;
- terminate_connection(cl);
+ if(r->request)
+ free(r->request);
+ free(r);
cp
- return 0;
}
-int del_host_h(conn_list_t *cl)
+void init_requests(void)
{
- del_host_t tmp;
- conn_list_t *fw;
cp
- if(read(cl->meta_socket, &((char*)(&tmp))[1], sizeof(tmp)-1) <= 0)
- {
- syslog(LOG_ERR, "%d: Receive failed: %m", __LINE__);
- return -1;
- }
-
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, "got DEL_HOST for " IP_ADDR_S,
- IP_ADDR_V(tmp.vpn_ip));
-
- if(!(fw = lookup_conn(tmp.vpn_ip)))
- {
- syslog(LOG_ERR, "Somebody wanted to delete " IP_ADDR_S " which does not exist?",
- IP_ADDR_V(tmp.vpn_ip));
- return 0;
- }
-
- notify_others(cl, fw, send_del_host);
-
- fw->status.termreq = 1;
- terminate_connection(fw);
+ past_request_tree = avl_alloc_tree((avl_compare_t)past_request_compare, (avl_action_t)free_past_request);
cp
- return 0;
}
-int ping_h(conn_list_t *cl)
+void exit_requests(void)
{
cp
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, "responding to ping from " IP_ADDR_S, IP_ADDR_V(cl->vpn_ip));
- cl->status.pinged = 0;
- cl->status.got_pong = 1;
-
- send_pong(cl);
+ avl_delete_tree(past_request_tree);
cp
- return 0;
}
-int pong_h(conn_list_t *cl)
+int seen_request(char *request)
{
+ past_request_t p, *new;
cp
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, "ok, got pong from " IP_ADDR_S, IP_ADDR_V(cl->vpn_ip));
- cl->status.got_pong = 1;
-cp
- return 0;
-}
+ p.request = request;
-int add_host_h(conn_list_t *cl)
-{
- add_host_t tmp;
- conn_list_t *ncn, *fw;
-cp
- if(read(cl->meta_socket, &((char*)(&tmp))[1], sizeof(tmp)-1) <= 0)
+ if(avl_search(past_request_tree, &p))
{
- syslog(LOG_ERR, "%d: Receive failed: %m", __LINE__);
- return -1;
+ if(debug_lvl >= DEBUG_SCARY_THINGS)
+ syslog(LOG_DEBUG, _("Already seen request"));
+ return 1;
}
-
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, "Add host request from " IP_ADDR_S, IP_ADDR_V(cl->vpn_ip));
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, "got ADD_HOST(" IP_ADDR_S "," IP_ADDR_S ",%hd)",
- IP_ADDR_V(tmp.vpn_ip), IP_ADDR_V(tmp.vpn_mask), tmp.portnr);
-
- /*
- Suggestion of Hans Bayle
- */
- if((fw = lookup_conn(tmp.vpn_ip)))
+ else
{
- notify_others(fw, cl, send_add_host);
+ new = (past_request_t *)xmalloc(sizeof(*new));
+ new->request = xstrdup(request);
+ new->firstseen = now;
+ avl_insert(past_request_tree, new);
return 0;
}
-
- ncn = new_conn_list();
- ncn->real_ip = tmp.real_ip;
- ncn->vpn_ip = tmp.vpn_ip;
- ncn->vpn_mask = tmp.vpn_mask;
- ncn->port = tmp.portnr;
- ncn->hostname = hostlookup(tmp.real_ip);
- ncn->nexthop = cl;
- ncn->next = conn_list;
- conn_list = ncn;
- ncn->status.active = 1;
- notify_others(ncn, cl, send_add_host);
-cp
- return 0;
+cp
}
-int req_key_h(conn_list_t *cl)
+void age_past_requests(void)
{
- key_req_t tmp;
- conn_list_t *fw;
-cp
- if(read(cl->meta_socket, &((char*)(&tmp))[1], sizeof(tmp)-1) <= 0)
- {
- syslog(LOG_ERR, "%d: Receive failed: %m", __LINE__);
- return -1;
- }
-
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, "got REQ_KEY from " IP_ADDR_S " for " IP_ADDR_S,
- IP_ADDR_V(tmp.from), IP_ADDR_V(tmp.to));
-
- if((tmp.to & myself->vpn_mask) == (myself->vpn_ip & myself->vpn_mask))
- { /* hey! they want something from ME! :) */
- send_key_answer(cl, tmp.from);
- return 0;
- }
-
- fw = lookup_conn(tmp.to);
-
- if(!fw)
- {
- syslog(LOG_ERR, "Attempting to forward key request to " IP_ADDR_S ", which does not exist?",
- IP_ADDR_V(tmp.to));
- return -1;
- }
-
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, "Forwarding request for public key to " IP_ADDR_S,
- IP_ADDR_V(fw->nexthop->vpn_ip));
-
- tmp.type = REQ_KEY;
- tmp.key = 0;
- if(write(fw->nexthop->meta_socket, &tmp, sizeof(tmp)) < 0)
+ 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, "send failed: %s:%d: %m", __FILE__, __LINE__);
- return -1;
+ next = node->next;
+ p = (past_request_t *)node->data;
+ if(p->firstseen + pingtimeout < now)
+ avl_delete_node(past_request_tree, node), deleted++;
+ else
+ left++;
}
-cp
- return 0;
-}
-void set_keys(conn_list_t *cl, key_req_t *k, char *key)
-{
- char *ek;
-cp
- if(!cl->public_key)
- {
- cl->public_key = xmalloc(sizeof(*cl->key));
- cl->public_key->key = NULL;
- }
- if(cl->public_key->key)
- free(cl->public_key->key);
- cl->public_key->length = k->len;
- cl->public_key->expiry = k->expiry;
- cl->public_key->key = xmalloc(k->len + 1);
- strcpy(cl->public_key->key, key);
-
- ek = make_shared_key(key);
- if(!cl->key)
- {
- cl->key = xmalloc(sizeof(*cl->key));
- cl->key->key = NULL;
- }
- if(cl->key->key)
- free(cl->key->key);
- cl->key->length = strlen(ek);
- cl->key->expiry = k->expiry;
- cl->key->key = xmalloc(strlen(ek) + 1);
- strcpy(cl->key->key, ek);
+ if(debug_lvl >= DEBUG_SCARY_THINGS && left + deleted)
+ syslog(LOG_DEBUG, _("Aging past requests: deleted %d, left %d\n"), deleted, left);
cp
}
-int ans_key_h(conn_list_t *cl)
-{
- key_req_t tmp;
- conn_list_t *fw, *gk;
- char *key;
-cp
- if(read(cl->meta_socket, &((char*)(&tmp))[1], sizeof(tmp)-3) <= 0)
- {
- syslog(LOG_ERR, "%d: Receive failed: %m", __LINE__);
- return -1;
- }
-
- key = xmalloc(tmp.len);
-
- if(read(cl->meta_socket, key, tmp.len + 1) <= 0)
- {
- syslog(LOG_ERR, "%d: Receive failed: %m", __LINE__);
- return -1;
- }
+/* Jumptable for the request handlers */
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, "got ANS_KEY from " IP_ADDR_S " for " IP_ADDR_S,
- IP_ADDR_V(tmp.from), IP_ADDR_V(tmp.to));
-
- if(tmp.to == myself->vpn_ip)
- { /* hey! that key's for ME! :) */
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, "Yeah! key arrived. Now do something with it.");
- gk = lookup_conn(tmp.from);
-
- if(!gk)
- {
- syslog(LOG_ERR, "Receiving key from " IP_ADDR_S ", which does not exist?",
- IP_ADDR_V(tmp.from));
- return -1;
- }
-
- set_keys(gk, &tmp, key);
- gk->status.validkey = 1;
- gk->status.waitingforkey = 0;
- flush_queues(gk);
- return 0;
- }
-
- fw = lookup_conn(tmp.to);
-
- if(!fw)
- {
- syslog(LOG_ERR, "Attempting to forward key to " IP_ADDR_S ", which does not exist?",
- IP_ADDR_V(tmp.to));
- return -1;
- }
-
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, "Forwarding public key to " IP_ADDR_S,
- IP_ADDR_V(fw->nexthop->vpn_ip));
- tmp.type = ANS_KEY;
- if(write(fw->nexthop->meta_socket, &tmp, sizeof(tmp) -2) < 0)
- {
- syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
- return -1;
- }
- if(write(fw->nexthop->meta_socket, key, tmp.len + 1) < 0)
- {
- syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
- return -1;
- }
-cp
- return 0;
-}
-
-int key_changed_h(conn_list_t *cl)
-{
- key_changed_t tmp;
- conn_list_t *ik;
-cp
- if(read(cl->meta_socket, &((char*)(&tmp))[1], sizeof(tmp)-1) <= 0)
- {
- syslog(LOG_ERR, "%d: Receive failed: %m", __LINE__);
- return -1;
- }
-
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, "got KEY_CHANGED from " IP_ADDR_S,
- IP_ADDR_V(tmp.from));
-
- ik = lookup_conn(tmp.from);
-
- if(!ik)
- {
- syslog(LOG_ERR, "Got changed key from " IP_ADDR_S ", which does not exist?",
- IP_ADDR_V(tmp.from));
- return -1;
- }
-
- ik->status.validkey = 0;
- ik->status.waitingforkey = 0;
-
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, "Forwarding key invalidation request");
+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_subnet_h, del_subnet_h,
+ add_edge_h, del_edge_h,
+ key_changed_h, req_key_h, ans_key_h,
+ tcppacket_h,
+};
- notify_others(cl, ik, send_key_changed);
-cp
- return 0;
-}
+/* Request names */
-int (*request_handlers[256])(conn_list_t*) = {
- 0, ack_h, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- termreq_h, timeout_h, del_host_h, 0, 0, 0, 0, 0, 0, 0,
- ping_h, pong_h, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- add_host_h, basic_info_h, passphrase_h, public_key_h, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- req_key_h, ans_key_h, key_changed_h, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+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",
};
projects / tinc / blobdiff