X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fprotocol.c;h=0728ea1a1b104e0f6b9971f40ae0e1ba64538794;hp=6740cb0d30ede6ef0a1ecc3cad79f17da049b05f;hb=73d77dd416b87b7c4e9b6aa450f64846235cd2b4;hpb=e8e7379311ca3bf6e1fdd7d0f477a43e510e2317 diff --git a/src/protocol.c b/src/protocol.c index 6740cb0d..85133954 100644 --- a/src/protocol.c +++ b/src/protocol.c @@ -1,7 +1,7 @@ /* - protocol.c -- handle the meta-protocol - Copyright (C) 1999,2000 Ivo Timmermans , - 2000 Guus Sliepen + protocol.c -- handle the meta-protocol, basic functions + Copyright (C) 1999-2005 Ivo Timmermans, + 2000-2006 Guus Sliepen 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 @@ -17,902 +17,237 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: protocol.c,v 1.28.4.15 2000/06/29 13:04:15 guus Exp $ + $Id$ */ -#include "config.h" +#include "system.h" -#include +#include "conf.h" +#include "connection.h" +#include "logger.h" +#include "meta.h" +#include "protocol.h" +#include "utils.h" +#include "xalloc.h" -#include -#include -#include -#include -#include -#include +bool tunnelserver = false; -#include -#include +/* Jumptable for the request handlers */ -#include "conf.h" -#include "encr.h" -#include "net.h" -#include "netutl.h" -#include "protocol.h" +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, +}; -#include "system.h" +/* Request names */ -char buffer[MAXBUFSIZE+1]; -int buflen; +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", +}; -/* Outgoing request routines */ +static avl_tree_t *past_request_tree; -int send_ack(conn_list_t *cl) +bool check_id(const char *id) { -cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending ACK to %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - - buflen = snprintf(buffer, MAXBUFSIZE, "%d\n", ACK); - - if((write(cl->meta_socket, buffer, buflen)) < 0) - { - syslog(LOG_ERR, _("Send failed: %d:%d: %m"), __FILE__, __LINE__); - return -1; - } -cp - return 0; -} + for(; *id; id++) + if(!isalnum(*id) && *id != '_') + return false; -int send_termreq(conn_list_t *cl) -{ -cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending TERMREQ to %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - - buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx\n", TERMREQ, myself->vpn_ip); - - if(write(cl->meta_socket, buffer, buflen) < 0) - { - if(debug_lvl > 1) - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); - return -1; - } -cp - return 0; + return true; } -int send_timeout(conn_list_t *cl) -{ -cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending TIMEOUT to %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - - buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx\n", PINGTIMEOUT, myself->vpn_ip); - - if((write(cl->meta_socket, buffer, buflen)) < 0) - { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); - return -1; - } -cp - return 0; -} +/* Generic request routines - takes care of logging and error + detection as well */ -int send_del_host(conn_list_t *cl, conn_list_t *new_host) +bool send_request(connection_t *c, const char *format, ...) { -cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending DEL_HOST for %s (%s) to %s (%s)"), - new_host->vpn_hostname, new_host->real_hostname, cl->vpn_hostname, cl->real_hostname); - - buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx\n", DEL_HOST, new_host->vpn_ip); - - if((write(cl->meta_socket, buffer, buflen)) < 0) - { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); - return -1; - } -cp - return 0; -} + va_list args; + char buffer[MAXBUFSIZE]; + int len, request; -int send_ping(conn_list_t *cl) -{ -cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending PING to %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - - buflen = snprintf(buffer, MAXBUFSIZE, "%d\n", PING); - - if((write(cl->meta_socket, buffer, buflen)) < 0) - { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); - return -1; - } -cp - return 0; -} + cp(); -int send_pong(conn_list_t *cl) -{ -cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending PONG to %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - - buflen = snprintf(buffer, MAXBUFSIZE, "%d\n", PONG); - - if((write(cl->meta_socket, buffer, buflen)) < 0) - { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); - return -1; - } -cp - return 0; -} + /* Use vsnprintf instead of vxasprintf: faster, no memory + fragmentation, cleanup is automatic, and there is a limit on the + input buffer anyway */ -int send_add_host(conn_list_t *cl, conn_list_t *new_host) -{ - ip_t real_ip; - int flags; - char *hostname; -cp - real_ip = new_host->real_ip; - hostname = new_host->real_hostname; - flags = new_host->flags; - - /* If we need to propagate information about a new host that wants us to export - * it's indirectdata flag, we set the INDIRECTDATA flag and unset the EXPORT... - * flag, and set it's real_ip to our vpn_ip, so that net.c send_packet() will - * work correctly. - */ - - if(flags & EXPORTINDIRECTDATA) - { - flags &= ~EXPORTINDIRECTDATA; - flags |= INDIRECTDATA; - real_ip = myself->vpn_ip; - hostname = myself->real_hostname; - } - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending ADD_HOST for %s (%s) to %s (%s)"), - new_host->vpn_hostname, hostname, cl->vpn_hostname, cl->real_hostname); - - buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx %lx/%lx:%x %d\n", ADD_HOST, real_ip, new_host->vpn_ip, new_host->vpn_mask, new_host->port, flags); - - if((write(cl->meta_socket, buffer, buflen)) < 0) - { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); - return -1; - } -cp - return 0; -} + va_start(args, format); + len = vsnprintf(buffer, MAXBUFSIZE, format, args); + va_end(args); -int send_key_changed(conn_list_t *cl, conn_list_t *src) -{ -cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending KEY_CHANGED origin %s to %s (%s)"), - src->vpn_hostname, cl->vpn_hostname, cl->real_hostname); - - buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx\n", KEY_CHANGED, src->vpn_ip); - - if((write(cl->meta_socket, buffer, buflen)) < 0) - { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); - return -1; - } -cp - return 0; -} + if(len < 0 || len > MAXBUFSIZE - 1) { + logger(LOG_ERR, _("Output buffer overflow while sending request to %s (%s)"), + c->name, c->hostname); + return false; + } -void send_key_changed_all(void) -{ - conn_list_t *p; -cp - for(p = conn_list; p != NULL; p = p->next) - if(p->status.meta && p->status.active) - send_key_changed(p, myself); -cp -} + 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); + } -int send_basic_info(conn_list_t *cl) -{ -cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending BASIC_INFO to %s"), - cl->real_hostname); - - buflen = snprintf(buffer, MAXBUFSIZE, "%d %d %lx/%lx:%x %d\n", BASIC_INFO, PROT_CURRENT, myself->vpn_ip, myself->vpn_mask, myself->port, myself->flags); - - if((write(cl->meta_socket, buffer, buflen)) < 0) - { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); - return -1; - } -cp - return 0; -} + buffer[len++] = '\n'; -int send_passphrase(conn_list_t *cl) -{ - passphrase_t tmp; -cp - encrypt_passphrase(&tmp); - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending PASSPHRASE to %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - - buflen = snprintf(buffer, MAXBUFSIZE, "%d %s\n", PASSPHRASE, tmp.phrase); - - if((write(cl->meta_socket, buffer, buflen)) < 0) - { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); - return -1; - } -cp - return 0; + if(c == broadcast) { + broadcast_meta(NULL, buffer, len); + return true; + } else + return send_meta(c, buffer, len); } -int send_public_key(conn_list_t *cl) +void forward_request(connection_t *from) { -cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending PUBLIC_KEY to %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - - buflen = snprintf(buffer, MAXBUFSIZE, "%d %s\n", PUBLIC_KEY, my_public_key_base36); - - if((write(cl->meta_socket, buffer, buflen)) < 0) - { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); - return -1; - } -cp - return 0; -} + int request; -/* WDN doet deze functie? (GS) -int send_calculate(conn_list_t *cl, char *k) -{ -cp - buflen = snprintf(buffer, MAXBUFSIZE, "%d %s\n", CALCULATE, k); - - if((write(cl->meta_socket, buffer, buflen)) < 0) - { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); - return -1; - } -cp - return 0; -} -*/ + cp(); -int send_key_request(ip_t to) -{ - conn_list_t *fw; -cp - fw = lookup_conn(to); - if(!fw) - { - syslog(LOG_ERR, _("Attempting to send REQ_KEY to %d.%d.%d.%d, which does not exist?"), - IP_ADDR_V(to)); - return -1; - } - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending REQ_KEY to %s (%s)"), - fw->nexthop->vpn_hostname, fw->nexthop->real_hostname); - - buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx %lx\n", REQ_KEY, to, myself->vpn_ip); - - if((write(fw->nexthop->meta_socket, buffer, buflen)) < 0) - { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); - return -1; - } - fw->status.waitingforkey = 1; -cp - return 0; -} + 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_key_answer(conn_list_t *cl, ip_t to) -{ - conn_list_t *fw; -cp - - fw = lookup_conn(to); - - if(!fw) - { - syslog(LOG_ERR, _("Attempting to send ANS_KEY to %d.%d.%d.%d, which does not exist?"), - IP_ADDR_V(to)); - return -1; - } - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending ANS_KEY to %s (%s)"), - fw->nexthop->vpn_hostname, fw->nexthop->real_hostname); - - buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx %lx %d %s\n", ANS_KEY, to, myself->vpn_ip, my_key_expiry, my_public_key_base36); - - if((write(fw->nexthop->meta_socket, buffer, buflen)) < 0) - { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); - return -1; - } -cp - return 0; -} + from->buffer[from->reqlen - 1] = '\n'; -/* - notify all my direct connections of a new host - that was added to the vpn, with the exception - of the source of the announcement. -*/ -int notify_others(conn_list_t *new, conn_list_t *source, - int (*function)(conn_list_t*, conn_list_t*)) -{ - conn_list_t *p; -cp - for(p = conn_list; p != NULL; p = p->next) - if(p != new && p != source && p->status.meta && p->status.active) - function(p, new); -cp - return 0; + broadcast_meta(from, from->buffer, from->reqlen); } -/* - notify one connection of everything - i have connected -*/ -int notify_one(conn_list_t *new) +bool receive_request(connection_t *c) { - 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; -} + int request; -/* - The incoming request handlers -*/ + cp(); -int basic_info_h(conn_list_t *cl) -{ -cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got BASIC_INFO from %s"), cl->real_hostname); - - if(sscanf(cl->buffer, "%*d %d %lx/%lx:%hx %d", &cl->protocol_version, &cl->vpn_ip, &cl->vpn_mask, &cl->port, &cl->flags) != 5) - { - syslog(LOG_ERR, _("Got bad BASIC_INFO from %s"), - cl->real_hostname); - return -1; - } - - cl->vpn_hostname = hostlookup(htonl(cl->vpn_ip)); - - if(cl->protocol_version != PROT_CURRENT) - { - syslog(LOG_ERR, _("Peer uses incompatible protocol version %d"), - cl->protocol_version); - return -1; - } - - if(cl->status.outgoing) - { - if(setup_vpn_connection(cl) < 0) - return -1; - send_basic_info(cl); - } - else - { - if(setup_vpn_connection(cl) < 0) - return -1; - send_passphrase(cl); - } -cp - return 0; -} + 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 passphrase_h(conn_list_t *cl) -{ -cp - cl->pp = xmalloc(sizeof(*(cl->pp))); - - if(sscanf(cl->buffer, "%*d %as", &(cl->pp->phrase)) != 1) - { - syslog(LOG_ERR, _("Got bad PASSPHRASE from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } - cl->pp->len = strlen(cl->pp->phrase); - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got PASSPHRASE from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - - if(cl->status.outgoing) - send_passphrase(cl); - else - send_public_key(cl); -cp - return 0; -} + 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 public_key_h(conn_list_t *cl) -{ - char *g_n; - conn_list_t *old; -cp - if(sscanf(cl->buffer, "%*d %as", &g_n) != 1) - { - syslog(LOG_ERR, _("Got bad PUBLIC_KEY from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got PUBLIC_KEY from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - - if(verify_passphrase(cl, g_n)) - { - /* intruder! */ - syslog(LOG_ERR, _("Intruder: passphrase does not match!")); - return -1; - } - - if(cl->status.outgoing) - send_public_key(cl); - else - { - send_ack(cl); - - /* 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. Because our - conn_list entry is not active, lookup_conn will skip ourself. */ - - while(old = lookup_conn(cl->vpn_ip)) - terminate_connection(old); - - cl->status.active = 1; - - if(debug_lvl > 0) - syslog(LOG_NOTICE, _("Connection with %s (%s) activated"), - cl->vpn_hostname, cl->real_hostname); - - notify_others(cl, NULL, send_add_host); - notify_one(cl); - } -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 ack_h(conn_list_t *cl) -{ -cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got ACK from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - - cl->status.active = 1; - - syslog(LOG_NOTICE, _("Connection with %s (%s) activated"), - cl->vpn_hostname, cl->real_hostname); - - notify_others(cl, NULL, send_add_host); - notify_one(cl); - - upstreamindex = 0; -cp - return 0; -} + if(!request_handlers[request](c)) { + /* Something went wrong. Probably scriptkiddies. Terminate. */ -int termreq_h(conn_list_t *cl) -{ -cp - if(!cl->status.active) - { - syslog(LOG_ERR, _("Got unauthorized TERMREQ from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got TERMREQ from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - - cl->status.termreq = 1; - - if(cl->status.active) - notify_others(cl, NULL, send_del_host); - - cl->status.active = 0; - - terminate_connection(cl); -cp - return 0; -} + 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 timeout_h(conn_list_t *cl) -{ -cp - if(!cl->status.active) - { - syslog(LOG_ERR, _("Got unauthorized TIMEOUT from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got TIMEOUT from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - - cl->status.termreq = 1; - terminate_connection(cl); -cp - return 0; + return true; } -int del_host_h(conn_list_t *cl) +static int past_request_compare(const past_request_t *a, const past_request_t *b) { - ip_t vpn_ip; - conn_list_t *fw; -cp - if(!cl->status.active) - { - syslog(LOG_ERR, _("Got unauthorized DEL_HOST from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } - - if(sscanf(cl->buffer, "%*d %lx", &vpn_ip) != 1) - { - syslog(LOG_ERR, _("Got bad DEL_HOST from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } - - if(!(fw = lookup_conn(vpn_ip))) - { - syslog(LOG_ERR, _("Got DEL_HOST for %d.%d.%d.%d from %s (%s) which does not exist?"), - IP_ADDR_V(vpn_ip), cl->vpn_hostname, cl->real_hostname); - return 0; - } - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got DEL_HOST for %s (%s) from %s (%s)"), - fw->vpn_hostname, fw->real_hostname, cl->vpn_hostname, cl->real_hostname); - - notify_others(fw, cl, send_del_host); - - fw->status.termreq = 1; - fw->status.active = 0; - - terminate_connection(fw); -cp - return 0; + return strcmp(a->request, b->request); } -int ping_h(conn_list_t *cl) +static void free_past_request(past_request_t *r) { -cp - if(!cl->status.active) - { - syslog(LOG_ERR, _("Got unauthorized PING from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got PING from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - - cl->status.pinged = 0; - cl->status.got_pong = 1; - - send_pong(cl); -cp - return 0; -} + cp(); -int pong_h(conn_list_t *cl) -{ -cp - if(!cl->status.active) - { - syslog(LOG_ERR, _("Got unauthorized PONG from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got PONG from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - - cl->status.got_pong = 1; -cp - return 0; -} + if(r->request) + free(r->request); -int add_host_h(conn_list_t *cl) -{ - ip_t real_ip; - ip_t vpn_ip; - ip_t vpn_mask; - unsigned short port; - int flags; - conn_list_t *ncn, *old; -cp - if(!cl->status.active) - { - syslog(LOG_ERR, _("Got unauthorized ADD_HOST from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } - - if(sscanf(cl->buffer, "%*d %lx %lx/%lx:%hx %d", &real_ip, &vpn_ip, &vpn_mask, &port, &flags) != 5) - { - syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } - - while(old = lookup_conn(vpn_ip)) - terminate_connection(old); - - ncn = new_conn_list(); - ncn->real_ip = real_ip; - ncn->real_hostname = hostlookup(htonl(real_ip)); - ncn->vpn_ip = vpn_ip; - ncn->vpn_mask = vpn_mask; - ncn->vpn_hostname = hostlookup(htonl(vpn_ip)); - ncn->port = port; - ncn->flags = flags; - ncn->nexthop = cl; - ncn->next = conn_list; - conn_list = ncn; - ncn->status.active = 1; - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got ADD_HOST for %s (%s) from %s (%s)"), - ncn->vpn_hostname, ncn->real_hostname, cl->vpn_hostname, cl->real_hostname); - - notify_others(ncn, cl, send_add_host); -cp - return 0; + free(r); } -int req_key_h(conn_list_t *cl) +void init_requests(void) { - ip_t to; - ip_t from; - conn_list_t *fw; -cp - if(!cl->status.active) - { - syslog(LOG_ERR, _("Got unauthorized REQ_KEY from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } - - if(sscanf(cl->buffer, "%*d %lx %lx", &to, &from) != 2) - { - syslog(LOG_ERR, _("Got bad REQ_KEY from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got REQ_KEY origin %d.%d.%d.%d destination %d.%d.%d.%d from %s (%s)"), - IP_ADDR_V(from), IP_ADDR_V(to), cl->vpn_hostname, cl->real_hostname); - - if((to & myself->vpn_mask) == (myself->vpn_ip & myself->vpn_mask)) - { /* hey! they want something from ME! :) */ - send_key_answer(cl, from); - return 0; - } - - fw = lookup_conn(to); - - if(!fw) - { - syslog(LOG_ERR, _("Attempting to forward REQ_KEY to %d.%d.%d.%d, which does not exist?"), - IP_ADDR_V(to)); - return -1; - } - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Forwarding REQ_KEY to %s (%s)"), - fw->nexthop->vpn_hostname, fw->nexthop->real_hostname); - - cl->buffer[cl->reqlen-1] = '\n'; - - if(write(fw->nexthop->meta_socket, cl->buffer, cl->reqlen) < 0) - { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); - return -1; - } -cp - return 0; + cp(); + + past_request_tree = avl_alloc_tree((avl_compare_t) past_request_compare, (avl_action_t) free_past_request); } -void set_keys(conn_list_t *cl, int expiry, char *key) +void exit_requests(void) { - 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 = strlen(key); - cl->public_key->expiry = expiry; - cl->public_key->key = xmalloc(cl->public_key->length + 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 = expiry; - cl->key->key = xmalloc(cl->key->length + 1); - strcpy(cl->key->key, ek); -cp + cp(); + + avl_delete_tree(past_request_tree); } -int ans_key_h(conn_list_t *cl) +bool seen_request(char *request) { - ip_t to; - ip_t from; - int expiry; - char *key; - conn_list_t *fw, *gk; -cp - if(!cl->status.active) - { - syslog(LOG_ERR, _("Got unauthorized ANS_KEY from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } - - if(sscanf(cl->buffer, "%*d %lx %lx %d %as", &to, &from, &expiry, &key) != 4) - { - syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got ANS_KEY origin %d.%d.%d.%d destination %d.%d.%d.%d from %s (%s)"), - IP_ADDR_V(from), IP_ADDR_V(to), cl->vpn_hostname, cl->real_hostname); - - if(to == myself->vpn_ip) - { /* hey! that key's for ME! :) */ - gk = lookup_conn(from); - - if(!gk) - { - syslog(LOG_ERR, _("Receiving ANS_KEY origin %d.%d.%d.%d from %s (%s), which does not exist?"), - IP_ADDR_V(from), cl->vpn_hostname, cl->real_hostname); - return -1; - } - - set_keys(gk, expiry, key); - gk->status.validkey = 1; - gk->status.waitingforkey = 0; - flush_queues(gk); - return 0; - } - - fw = lookup_conn(to); - - if(!fw) - { - syslog(LOG_ERR, _("Attempting to forward ANS_KEY to %d.%d.%d.%d, which does not exist?"), - IP_ADDR_V(to)); - return -1; - } - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Forwarding ANS_KEY to %s (%s)"), - fw->nexthop->vpn_hostname, fw->nexthop->real_hostname); - - cl->buffer[cl->reqlen-1] = '\n'; - - if((write(fw->nexthop->meta_socket, cl->buffer, cl->reqlen)) < 0) - { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); - return -1; - } -cp - return 0; + past_request_t *new, p = {0}; + + cp(); + + p.request = request; + + 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 key_changed_h(conn_list_t *cl) +void age_past_requests(void) { - ip_t from; - conn_list_t *ik; -cp - if(!cl->status.active) - { - syslog(LOG_ERR, _("Got unauthorized KEY_CHANGED from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } - - if(sscanf(cl->buffer, "%*d %lx", &from) != 1) - { - syslog(LOG_ERR, _("Got bad KEY_CHANGED from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } - - ik = lookup_conn(from); - - if(!ik) - { - syslog(LOG_ERR, _("Got KEY_CHANGED origin %d.%d.%d.%d from %s (%s), which does not exist?"), - IP_ADDR_V(from), cl->vpn_hostname, cl->real_hostname); - return -1; - } - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got KEY_CHANGED origin %s from %s (%s)"), - ik->vpn_hostname, cl->vpn_hostname, cl->real_hostname); - - ik->status.validkey = 0; - ik->status.waitingforkey = 0; - - notify_others(ik, cl, send_key_changed); -cp - return 0; -} + avl_node_t *node, *next; + past_request_t *p; + int left = 0, deleted = 0; -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 -}; + cp(); + + for(node = past_request_tree->head; node; node = next) { + next = node->next; + p = node->data; + + if(p->firstseen + pinginterval < now) + avl_delete_node(past_request_tree, node), deleted++; + else + left++; + } + + if(left || deleted) + ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Aging past requests: deleted %d, left %d"), + deleted, left); +}