2 meta.c -- handle the meta communication
3 Copyright (C) 2000-2009 Guus Sliepen <guus@tinc-vpn.org>,
4 2000-2005 Ivo Timmermans
5 2006 Scott Lamb <slamb@slamb.org>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License along
18 with this program; if not, write to the Free Software Foundation, Inc.,
19 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24 #include "splay_tree.h"
26 #include "connection.h"
34 bool send_meta(connection_t *c, const char *buffer, int length) {
36 logger(LOG_ERR, "send_meta() called with NULL pointer!");
40 ifdebug(META) logger(LOG_DEBUG, "Sending %d bytes of metadata to %s (%s)", length,
41 c->name, c->hostname);
43 /* Add our data to buffer */
44 if(c->status.encryptout) {
46 size_t outlen = length;
48 if(!cipher_encrypt(&c->outcipher, buffer, length, outbuf, &outlen, false) || outlen != length) {
49 logger(LOG_ERR, "Error while encrypting metadata to %s (%s)",
50 c->name, c->hostname);
54 ifdebug(META) logger(LOG_DEBUG, "Encrypted write %p %p %p %d", c, c->buffer, outbuf, length);
55 bufferevent_write(c->buffer, (void *)outbuf, length);
56 ifdebug(META) logger(LOG_DEBUG, "Done.");
58 ifdebug(META) logger(LOG_DEBUG, "Unencrypted write %p %p %p %d", c, c->buffer, buffer, length);
59 bufferevent_write(c->buffer, (void *)buffer, length);
60 ifdebug(META) logger(LOG_DEBUG, "Done.");
66 void broadcast_meta(connection_t *from, const char *buffer, int length) {
70 for(node = connection_tree->head; node; node = node->next) {
73 if(c != from && c->status.active)
74 send_meta(c, buffer, length);
78 bool receive_meta(connection_t *c) {
80 char inbuf[MAXBUFSIZE];
81 char *bufp = inbuf, *endp;
84 - Read as much as possible from the TCP socket in one go.
86 - Check if a full request is in the input buffer.
87 - If yes, process request and remove it from the buffer,
89 - If not, keep stuff in buffer and exit.
92 inlen = recv(c->socket, inbuf, sizeof inbuf, 0);
95 logger(LOG_ERR, "Receive callback called for %s (%s) but no data to receive: %s", c->name, c->hostname, strerror(errno));
100 if(!c->status.decryptin) {
101 endp = memchr(bufp, '\n', inlen);
107 evbuffer_add(c->buffer->input, bufp, endp - bufp);
109 inlen -= endp - bufp;
112 size_t outlen = inlen;
113 ifdebug(META) logger(LOG_DEBUG, "Received encrypted %zu bytes", inlen);
114 evbuffer_expand(c->buffer->input, c->buffer->input->off + inlen);
116 if(!cipher_decrypt(&c->incipher, bufp, inlen, c->buffer->input->buffer + c->buffer->input->off, &outlen, false) || inlen != outlen) {
117 logger(LOG_ERR, "Error while decrypting metadata from %s (%s)",
118 c->name, c->hostname);
121 c->buffer->input->off += inlen;
126 while(c->buffer->input->off) {
127 /* Are we receiving a TCPpacket? */
130 if(c->tcplen <= c->buffer->input->off) {
131 receive_tcppacket(c, (char *)c->buffer->input->buffer, c->tcplen);
132 evbuffer_drain(c->buffer->input, c->tcplen);
140 /* Otherwise we are waiting for a request */
142 char *request = evbuffer_readline(c->buffer->input);
144 bool result = receive_request(c, request);
155 c->last_ping_time = time(NULL);