X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fprotocol.c;h=c8b868caa730ffee973f9ae46511dbb551821e17;hp=af8029d0a79c511fc1f0dfe4c9a64aff56cfd1fa;hb=5db596c6844169f1eb5f804b72abe99d067aaa5a;hpb=f0aa9641e82fb6e09c1e485366d14dddaa7f7c36 diff --git a/src/protocol.c b/src/protocol.c index af8029d0..c8b868ca 100644 --- a/src/protocol.c +++ b/src/protocol.c @@ -1,7 +1,7 @@ /* protocol.c -- handle the meta-protocol, basic functions - Copyright (C) 1999-2001 Ivo Timmermans , - 2000,2001 Guus Sliepen + Copyright (C) 1999-2001 Ivo Timmermans , + 2000,2001 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 @@ -17,7 +17,7 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: protocol.c,v 1.28.4.122 2002/02/10 21:57:54 guus Exp $ + $Id: protocol.c,v 1.28.4.140 2003/07/12 17:41:46 guus Exp $ */ #include "config.h" @@ -26,29 +26,53 @@ #include #include -#include #include #include #include #include +#include #include "conf.h" #include "protocol.h" #include "meta.h" #include "connection.h" +#include "logger.h" #include "system.h" +/* Jumptable for the request handlers */ + +static 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, +}; + +/* Request names */ + +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", +}; + +static avl_tree_t *past_request_tree; + int check_id(char *id) { - int i; + int i; + + for(i = 0; i < strlen(id); i++) + if(!isalnum(id[i]) && id[i] != '_') + return -1; - for (i = 0; i < strlen(id); i++) - if(!isalnum(id[i]) && id[i] != '_') - return -1; - - return 0; + return 0; } /* Generic request routines - takes care of logging and error @@ -56,115 +80,185 @@ int check_id(char *id) 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 */ - - 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], c->name, c->hostname); - return -1; - } - - if(debug_lvl >= DEBUG_PROTOCOL) - { - 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(c, buffer, len); + 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 */ + + va_start(args, format); + len = vsnprintf(buffer, MAXBUFSIZE, format, args); + va_end(args); + + if(len < 0 || len > MAXBUFSIZE - 1) { + logger(LOG_ERR, _("Output buffer overflow while sending request to %s (%s)"), + c->name, c->hostname); + return -1; + } + + ifdebug(PROTOCOL) { + sscanf(buffer, "%d", &request); + ifdebug(META) + logger(LOG_DEBUG, _("Sending %s to %s (%s): %s"), + request_name[request], c->name, c->hostname, buffer); + else + logger(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request], + c->name, c->hostname); + } + + buffer[len++] = '\n'; + + if(c == broadcast) + return broadcast_meta(NULL, buffer, len); + else + return send_meta(c, buffer, len); +} + +int forward_request(connection_t *from) +{ + int request; + cp(); + + cp(); + + 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); + } + + from->buffer[from->reqlen - 1] = '\n'; + + return broadcast_meta(from, from->buffer, from->reqlen); } int receive_request(connection_t *c) { - int request; -cp - if(sscanf(c->buffer, "%d", &request) == 1) - { - 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); - } + int request; + + cp(); + + 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); + + return -1; + } 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); + } + } + + if((c->allow_request != ALL) && (c->allow_request != request)) { + logger(LOG_ERR, _("Unauthorized request from %s (%s)"), c->name, + c->hostname); + return -1; + } + + if(request_handlers[request] (c)) + /* Something went wrong. Probably scriptkiddies. Terminate. */ + { + logger(LOG_ERR, _("Error while processing %s from %s (%s)"), + request_name[request], c->name, c->hostname); + return -1; + } + } else { + logger(LOG_ERR, _("Bogus data received from %s (%s)"), + c->name, c->hostname); + return -1; } - if((c->allow_request != ALL) && (c->allow_request != request)) - { - syslog(LOG_ERR, _("Unauthorized request from %s (%s)"), c->name, c->hostname); - 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; - } - } - else - { - syslog(LOG_ERR, _("Bogus data received from %s (%s)"), - c->name, c->hostname); - return -1; - } -cp - return 0; + return 0; } -/* Jumptable for the request handlers */ +static int past_request_compare(past_request_t *a, past_request_t *b) +{ + return strcmp(a->request, b->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_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, -}; +static void free_past_request(past_request_t *r) +{ + cp(); -/* Request names */ + if(r->request) + free(r->request); -char (*request_name[]) = { - "ID", "METAKEY", "CHALLENGE", "CHAL_REPLY", "ACK", - "STATUS", "ERROR", "TERMREQ", - "PING", "PONG", -// "ADD_NODE", "DEL_NODE", - "ADD_SUBNET", "DEL_SUBNET", - "ADD_EDGE", "DEL_EDGE", - "KEY_CHANGED", "REQ_KEY", "ANS_KEY", - "PACKET", -}; + free(r); +} + +void init_requests(void) +{ + cp(); + + past_request_tree = avl_alloc_tree((avl_compare_t) past_request_compare, (avl_action_t) free_past_request); +} + +void exit_requests(void) +{ + cp(); + + avl_delete_tree(past_request_tree); +} + +int seen_request(char *request) +{ + past_request_t p, *new; + + cp(); + + p.request = request; + + if(avl_search(past_request_tree, &p)) { + ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Already seen request")); + return 1; + } else { + new = (past_request_t *) xmalloc(sizeof(*new)); + new->request = xstrdup(request); + new->firstseen = now; + avl_insert(past_request_tree, new); + return 0; + } +} + +void age_past_requests(void) +{ + avl_node_t *node, *next; + past_request_t *p; + int left = 0, deleted = 0; + + cp(); + + for(node = past_request_tree->head; node; node = next) { + next = node->next; + p = (past_request_t *) node->data; + + if(p->firstseen + pingtimeout < 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\n"), + deleted, left); +}