2000-09-26 14:06:11 +00:00
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/*
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meta.c -- handle the meta communication
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2009-09-24 21:29:46 +00:00
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Copyright (C) 2000-2009 Guus Sliepen <guus@tinc-vpn.org>,
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2006-04-26 13:52:58 +00:00
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2000-2005 Ivo Timmermans
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2009-09-25 19:14:56 +00:00
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2006 Scott Lamb <slamb@slamb.org>
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2000-09-26 14:06:11 +00:00
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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2009-09-24 22:01:00 +00:00
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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2000-09-26 14:06:11 +00:00
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*/
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2003-07-17 15:06:27 +00:00
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#include "system.h"
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2000-10-11 10:35:17 +00:00
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2007-05-18 10:05:26 +00:00
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#include "splay_tree.h"
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2008-12-11 14:44:44 +00:00
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#include "cipher.h"
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2000-11-20 19:12:17 +00:00
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#include "connection.h"
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2003-07-06 22:11:37 +00:00
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#include "logger.h"
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2003-08-12 14:48:13 +00:00
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#include "meta.h"
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2003-07-17 15:06:27 +00:00
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#include "net.h"
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#include "protocol.h"
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#include "utils.h"
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2006-03-19 12:43:28 +00:00
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#include "xalloc.h"
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2000-10-11 10:35:17 +00:00
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2012-02-25 17:25:21 +00:00
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bool send_meta_sptps(void *handle, const char *buffer, size_t length) {
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connection_t *c = handle;
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if(!c) {
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2012-02-26 17:37:36 +00:00
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logger(DEBUG_ALWAYS, LOG_ERR, "send_meta_sptps() called with NULL pointer!");
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2012-02-25 17:25:21 +00:00
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abort();
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}
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2012-04-22 01:05:29 +00:00
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logger(DEBUG_META, LOG_DEBUG, "send_meta_sptps(%s, %p, %zu)", c->name, buffer, length);
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2012-02-25 17:25:21 +00:00
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buffer_add(&c->outbuf, buffer, length);
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event_add(&c->outevent, NULL);
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return true;
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}
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2007-05-18 10:00:00 +00:00
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bool send_meta(connection_t *c, const char *buffer, int length) {
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2009-06-11 16:36:08 +00:00
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if(!c) {
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2012-02-26 17:37:36 +00:00
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logger(DEBUG_ALWAYS, LOG_ERR, "send_meta() called with NULL pointer!");
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2009-06-11 16:36:08 +00:00
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abort();
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}
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2012-02-26 17:37:36 +00:00
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logger(DEBUG_META, LOG_DEBUG, "Sending %d bytes of metadata to %s (%s)", length,
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2007-11-07 02:47:05 +00:00
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c->name, c->hostname);
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2002-09-09 21:25:28 +00:00
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2012-02-25 17:25:21 +00:00
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if(c->protocol_minor >= 2)
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2012-02-26 11:33:16 +00:00
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return sptps_send_record(&c->sptps, 0, buffer, length);
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2012-02-25 17:25:21 +00:00
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2006-01-19 17:13:18 +00:00
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/* Add our data to buffer */
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2002-09-09 21:25:28 +00:00
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if(c->status.encryptout) {
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2008-12-11 14:44:44 +00:00
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size_t outlen = length;
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2007-05-19 22:23:02 +00:00
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2011-05-14 20:30:23 +00:00
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if(!cipher_encrypt(&c->outcipher, buffer, length, buffer_prepare(&c->outbuf, length), &outlen, false) || outlen != length) {
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2012-02-26 17:37:36 +00:00
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logger(DEBUG_ALWAYS, LOG_ERR, "Error while encrypting metadata to %s (%s)",
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2008-12-11 14:44:44 +00:00
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c->name, c->hostname);
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2003-10-10 16:24:24 +00:00
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return false;
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}
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2011-05-14 17:20:56 +00:00
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2006-01-19 17:13:18 +00:00
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} else {
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2011-05-14 17:20:56 +00:00
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buffer_add(&c->outbuf, buffer, length);
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2006-01-19 17:13:18 +00:00
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}
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2011-05-14 17:20:56 +00:00
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event_add(&c->outevent, NULL);
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2006-01-19 17:13:18 +00:00
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return true;
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}
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2002-09-09 21:25:28 +00:00
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2007-05-18 10:00:00 +00:00
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void broadcast_meta(connection_t *from, const char *buffer, int length) {
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2007-05-18 10:05:26 +00:00
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splay_node_t *node;
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2002-09-09 21:25:28 +00:00
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connection_t *c;
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for(node = connection_tree->head; node; node = node->next) {
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2003-08-28 21:05:11 +00:00
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c = node->data;
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2002-09-09 21:25:28 +00:00
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2003-11-17 15:30:18 +00:00
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if(c != from && c->status.active)
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2002-09-09 21:25:28 +00:00
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send_meta(c, buffer, length);
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}
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2000-09-26 14:06:11 +00:00
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}
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2012-02-25 17:25:21 +00:00
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bool receive_meta_sptps(void *handle, uint8_t type, const char *data, uint16_t length) {
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connection_t *c = handle;
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if(!c) {
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2012-02-26 17:37:36 +00:00
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logger(DEBUG_ALWAYS, LOG_ERR, "receive_meta_sptps() called with NULL pointer!");
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2012-02-25 17:25:21 +00:00
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abort();
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}
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2012-04-22 01:05:29 +00:00
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logger(DEBUG_META, LOG_DEBUG, "receive_meta_sptps(%s, %d, %p, %hu)", c->name, type, data, length);
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2012-02-25 17:25:21 +00:00
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if(type == SPTPS_HANDSHAKE) {
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if(c->allow_request == ACK)
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return send_ack(c);
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else
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return true;
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}
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if(!data)
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return true;
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/* Are we receiving a TCPpacket? */
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if(c->tcplen) {
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if(length != c->tcplen)
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return false;
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receive_tcppacket(c, data, length);
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c->tcplen = 0;
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return true;
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}
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/* Otherwise we are waiting for a request */
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return receive_request(c, data);
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}
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2007-05-18 10:00:00 +00:00
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bool receive_meta(connection_t *c) {
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2011-05-17 08:58:22 +00:00
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int inlen;
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2002-09-09 21:25:28 +00:00
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char inbuf[MAXBUFSIZE];
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2007-05-19 22:23:02 +00:00
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char *bufp = inbuf, *endp;
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2002-09-09 21:25:28 +00:00
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/* Strategy:
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- Read as much as possible from the TCP socket in one go.
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- Decrypt it.
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- Check if a full request is in the input buffer.
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- If yes, process request and remove it from the buffer,
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then check again.
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- If not, keep stuff in buffer and exit.
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*/
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2011-05-22 11:15:05 +00:00
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buffer_compact(&c->inbuf, MAXBUFSIZE);
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2011-05-22 10:56:51 +00:00
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if(sizeof inbuf <= c->inbuf.len) {
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2012-02-26 17:37:36 +00:00
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logger(DEBUG_ALWAYS, LOG_ERR, "Input buffer full for %s (%s)", c->name, c->hostname);
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2011-05-22 10:56:51 +00:00
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return false;
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}
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2011-05-14 17:20:56 +00:00
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inlen = recv(c->socket, inbuf, sizeof inbuf - c->inbuf.len, 0);
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2002-09-09 21:25:28 +00:00
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2007-05-18 11:19:31 +00:00
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if(inlen <= 0) {
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2009-11-02 13:24:27 +00:00
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if(!inlen || !errno) {
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2012-02-26 17:37:36 +00:00
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logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection closed by %s (%s)",
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2002-09-09 21:25:28 +00:00
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c->name, c->hostname);
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2009-10-24 23:40:07 +00:00
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} else if(sockwouldblock(sockerrno))
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2003-07-22 20:55:21 +00:00
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return true;
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2002-09-09 21:25:28 +00:00
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else
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2012-02-26 17:37:36 +00:00
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logger(DEBUG_ALWAYS, LOG_ERR, "Metadata socket read error for %s (%s): %s",
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2009-10-24 23:40:07 +00:00
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c->name, c->hostname, sockstrerror(sockerrno));
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2003-07-22 20:55:21 +00:00
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return false;
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2002-09-09 21:25:28 +00:00
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}
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2007-05-19 22:23:02 +00:00
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do {
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2012-02-25 17:25:21 +00:00
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if(c->protocol_minor >= 2) {
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2012-04-22 01:05:29 +00:00
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logger(DEBUG_META, LOG_DEBUG, "Receiving %d bytes of SPTPS data", inlen);
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2012-02-26 11:33:16 +00:00
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return sptps_receive_data(&c->sptps, bufp, inlen);
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2012-02-25 17:25:21 +00:00
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}
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2007-05-19 22:23:02 +00:00
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if(!c->status.decryptin) {
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endp = memchr(bufp, '\n', inlen);
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if(endp)
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endp++;
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else
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endp = bufp + inlen;
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2011-05-14 17:20:56 +00:00
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buffer_add(&c->inbuf, bufp, endp - bufp);
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2002-09-09 21:25:28 +00:00
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2007-05-19 22:23:02 +00:00
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inlen -= endp - bufp;
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bufp = endp;
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} else {
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2008-12-11 14:44:44 +00:00
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size_t outlen = inlen;
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2012-02-26 17:37:36 +00:00
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logger(DEBUG_META, LOG_DEBUG, "Received encrypted %d bytes", inlen);
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2008-12-11 14:44:44 +00:00
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2011-05-14 17:20:56 +00:00
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if(!cipher_decrypt(&c->incipher, bufp, inlen, buffer_prepare(&c->inbuf, inlen), &outlen, false) || inlen != outlen) {
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2012-02-26 17:37:36 +00:00
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logger(DEBUG_ALWAYS, LOG_ERR, "Error while decrypting metadata from %s (%s)",
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2008-12-11 14:44:44 +00:00
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c->name, c->hostname);
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2003-10-10 16:24:24 +00:00
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return false;
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}
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2007-11-07 02:47:05 +00:00
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2007-05-19 22:23:02 +00:00
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inlen = 0;
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2002-09-09 21:25:28 +00:00
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}
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2011-05-14 17:20:56 +00:00
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while(c->inbuf.len) {
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2007-05-19 22:23:02 +00:00
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/* Are we receiving a TCPpacket? */
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if(c->tcplen) {
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2011-05-14 17:20:56 +00:00
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char *tcpbuffer = buffer_read(&c->inbuf, c->tcplen);
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if(tcpbuffer) {
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receive_tcppacket(c, tcpbuffer, c->tcplen);
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2011-06-02 19:16:57 +00:00
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c->tcplen = 0;
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2007-05-19 22:23:02 +00:00
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continue;
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} else {
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break;
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}
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}
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2002-09-09 21:25:28 +00:00
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2007-05-19 22:23:02 +00:00
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/* Otherwise we are waiting for a request */
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2002-09-09 21:25:28 +00:00
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2011-05-14 17:20:56 +00:00
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char *request = buffer_readline(&c->inbuf);
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2007-05-19 22:23:02 +00:00
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if(request) {
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2008-12-11 14:44:44 +00:00
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bool result = receive_request(c, request);
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if(!result)
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return false;
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2002-09-09 21:25:28 +00:00
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continue;
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} else {
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break;
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}
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}
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2007-05-19 22:23:02 +00:00
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} while(inlen);
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2002-09-09 21:25:28 +00:00
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2003-07-22 20:55:21 +00:00
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return true;
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2000-09-26 14:06:11 +00:00
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}
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