2 meta.c -- handle the meta communication
3 Copyright (C) 2000-2014 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.
25 #include "connection.h"
33 bool send_meta_sptps(void *handle, uint8_t type, const void *buffer, size_t length) {
34 connection_t *c = handle;
37 logger(DEBUG_ALWAYS, LOG_ERR, "send_meta_sptps() called with NULL pointer!");
41 buffer_add(&c->outbuf, buffer, length);
42 io_set(&c->io, IO_READ | IO_WRITE);
47 bool send_meta(connection_t *c, const char *buffer, int length) {
49 logger(DEBUG_ALWAYS, LOG_ERR, "send_meta() called with NULL pointer!");
53 logger(DEBUG_META, LOG_DEBUG, "Sending %d bytes of metadata to %s (%s)", length,
54 c->name, c->hostname);
56 if(c->protocol_minor >= 2)
57 return sptps_send_record(&c->sptps, 0, buffer, length);
59 /* Add our data to buffer */
60 if(c->status.encryptout) {
61 size_t outlen = length;
63 if(!cipher_encrypt(c->outcipher, buffer, length, buffer_prepare(&c->outbuf, length), &outlen, false) || outlen != length) {
64 logger(DEBUG_ALWAYS, LOG_ERR, "Error while encrypting metadata to %s (%s)",
65 c->name, c->hostname);
69 buffer_add(&c->outbuf, buffer, length);
72 io_set(&c->io, IO_READ | IO_WRITE);
77 void broadcast_meta(connection_t *from, const char *buffer, int length) {
78 for list_each(connection_t, c, connection_list)
79 if(c != from && c->edge)
80 send_meta(c, buffer, length);
83 bool receive_meta_sptps(void *handle, uint8_t type, const void *vdata, uint16_t length) {
84 const char *data = vdata;
85 connection_t *c = handle;
88 logger(DEBUG_ALWAYS, LOG_ERR, "receive_meta_sptps() called with NULL pointer!");
92 if(type == SPTPS_HANDSHAKE) {
93 if(c->allow_request == ACK)
102 /* Are we receiving a TCPpacket? */
105 if(length != c->tcplen)
107 receive_tcppacket(c, data, length);
112 /* Change newline to null byte, just like non-SPTPS requests */
114 if(data[length - 1] == '\n')
115 ((char *)data)[length - 1] = 0;
117 /* Otherwise we are waiting for a request */
119 return receive_request(c, data);
122 bool receive_meta(connection_t *c) {
124 char inbuf[MAXBUFSIZE];
125 char *bufp = inbuf, *endp;
128 - Read as much as possible from the TCP socket in one go.
130 - Check if a full request is in the input buffer.
131 - If yes, process request and remove it from the buffer,
133 - If not, keep stuff in buffer and exit.
136 buffer_compact(&c->inbuf, MAXBUFSIZE);
138 if(sizeof inbuf <= c->inbuf.len) {
139 logger(DEBUG_ALWAYS, LOG_ERR, "Input buffer full for %s (%s)", c->name, c->hostname);
143 inlen = recv(c->socket, inbuf, sizeof inbuf - c->inbuf.len, 0);
146 if(!inlen || !sockerrno) {
147 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection closed by %s (%s)",
148 c->name, c->hostname);
149 } else if(sockwouldblock(sockerrno))
152 logger(DEBUG_ALWAYS, LOG_ERR, "Metadata socket read error for %s (%s): %s",
153 c->name, c->hostname, sockstrerror(sockerrno));
158 if(c->protocol_minor >= 2)
159 return sptps_receive_data(&c->sptps, bufp, inlen);
161 if(!c->status.decryptin) {
162 endp = memchr(bufp, '\n', inlen);
168 buffer_add(&c->inbuf, bufp, endp - bufp);
170 inlen -= endp - bufp;
173 size_t outlen = inlen;
175 if(!cipher_decrypt(c->incipher, bufp, inlen, buffer_prepare(&c->inbuf, inlen), &outlen, false) || inlen != outlen) {
176 logger(DEBUG_ALWAYS, LOG_ERR, "Error while decrypting metadata from %s (%s)",
177 c->name, c->hostname);
184 while(c->inbuf.len) {
185 /* Are we receiving a TCPpacket? */
188 char *tcpbuffer = buffer_read(&c->inbuf, c->tcplen);
193 if(c->outgoing && proxytype == PROXY_SOCKS4 && c->allow_request == ID) {
194 if(tcpbuffer[0] == 0 && tcpbuffer[1] == 0x5a) {
195 logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Proxy request granted");
197 logger(DEBUG_CONNECTIONS, LOG_ERR, "Proxy request rejected");
200 } else if(c->outgoing && proxytype == PROXY_SOCKS5 && c->allow_request == ID) {
201 if(tcpbuffer[0] != 5) {
202 logger(DEBUG_CONNECTIONS, LOG_ERR, "Invalid response from proxy server");
205 if(tcpbuffer[1] == (char)0xff) {
206 logger(DEBUG_CONNECTIONS, LOG_ERR, "Proxy request rejected: unsuitable authentication method");
209 if(tcpbuffer[2] != 5) {
210 logger(DEBUG_CONNECTIONS, LOG_ERR, "Invalid response from proxy server");
213 if(tcpbuffer[3] == 0) {
214 logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Proxy request granted");
216 logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Proxy request rejected");
220 logger(DEBUG_CONNECTIONS, LOG_ERR, "c->tcplen set but c->node is NULL!");
224 if(c->allow_request == ALL) {
225 receive_tcppacket(c, tcpbuffer, c->tcplen);
227 logger(DEBUG_CONNECTIONS, LOG_ERR, "Got unauthorized TCP packet from %s (%s)", c->name, c->hostname);
235 /* Otherwise we are waiting for a request */
237 char *request = buffer_readline(&c->inbuf);
239 bool result = receive_request(c, request);