123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170 |
- /*
- 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
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- 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 1.28.4.122 2002/02/10 21:57:54 guus Exp $
- */
- #include "config.h"
- #include <sys/types.h>
- #include <stdlib.h>
- #include <string.h>
- #include <syslog.h>
- #include <stdio.h>
- #include <stdarg.h>
- #include <errno.h>
- #include <utils.h>
- #include "conf.h"
- #include "protocol.h"
- #include "meta.h"
- #include "connection.h"
- #include "system.h"
- int check_id(char *id)
- {
- int i;
- 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 */
- 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);
- }
- 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);
- }
- }
- 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;
- }
- /* Jumptable for the request handlers */
- 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,
- };
- /* Request names */
- 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",
- };
|