2 meta.c -- handle the meta communication
3 Copyright (C) 2000-2013 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 char *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 char *data, uint16_t length) {
84 connection_t *c = handle;
87 logger(DEBUG_ALWAYS, LOG_ERR, "receive_meta_sptps() called with NULL pointer!");
91 if(type == SPTPS_HANDSHAKE) {
92 if(c->allow_request == ACK)
101 /* Are we receiving a TCPpacket? */
104 if(length != c->tcplen)
106 receive_tcppacket(c, data, length);
111 /* Change newline to null byte, just like non-SPTPS requests */
113 if(data[length - 1] == '\n')
114 ((char *)data)[length - 1] = 0;
116 /* Otherwise we are waiting for a request */
118 return receive_request(c, data);
121 bool receive_meta(connection_t *c) {
123 char inbuf[MAXBUFSIZE];
124 char *bufp = inbuf, *endp;
127 - Read as much as possible from the TCP socket in one go.
129 - Check if a full request is in the input buffer.
130 - If yes, process request and remove it from the buffer,
132 - If not, keep stuff in buffer and exit.
135 buffer_compact(&c->inbuf, MAXBUFSIZE);
137 if(sizeof inbuf <= c->inbuf.len) {
138 logger(DEBUG_ALWAYS, LOG_ERR, "Input buffer full for %s (%s)", c->name, c->hostname);
142 inlen = recv(c->socket, inbuf, sizeof inbuf - c->inbuf.len, 0);
145 if(!inlen || !sockerrno) {
146 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection closed by %s (%s)",
147 c->name, c->hostname);
148 } else if(sockwouldblock(sockerrno))
151 logger(DEBUG_ALWAYS, LOG_ERR, "Metadata socket read error for %s (%s): %s",
152 c->name, c->hostname, sockstrerror(sockerrno));
157 if(c->protocol_minor >= 2)
158 return sptps_receive_data(&c->sptps, bufp, inlen);
160 if(!c->status.decryptin) {
161 endp = memchr(bufp, '\n', inlen);
167 buffer_add(&c->inbuf, bufp, endp - bufp);
169 inlen -= endp - bufp;
172 size_t outlen = inlen;
174 if(!cipher_decrypt(c->incipher, bufp, inlen, buffer_prepare(&c->inbuf, inlen), &outlen, false) || inlen != outlen) {
175 logger(DEBUG_ALWAYS, LOG_ERR, "Error while decrypting metadata from %s (%s)",
176 c->name, c->hostname);
183 while(c->inbuf.len) {
184 /* Are we receiving a TCPpacket? */
187 char *tcpbuffer = buffer_read(&c->inbuf, c->tcplen);
192 if(c->outgoing && proxytype == PROXY_SOCKS4 && c->allow_request == ID) {
193 if(tcpbuffer[0] == 0 && tcpbuffer[1] == 0x5a) {
194 logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Proxy request granted");
196 logger(DEBUG_CONNECTIONS, LOG_ERR, "Proxy request rejected");
199 } else if(c->outgoing && proxytype == PROXY_SOCKS5 && c->allow_request == ID) {
200 if(tcpbuffer[0] != 5) {
201 logger(DEBUG_CONNECTIONS, LOG_ERR, "Invalid response from proxy server");
204 if(tcpbuffer[1] == (char)0xff) {
205 logger(DEBUG_CONNECTIONS, LOG_ERR, "Proxy request rejected: unsuitable authentication method");
208 if(tcpbuffer[2] != 5) {
209 logger(DEBUG_CONNECTIONS, LOG_ERR, "Invalid response from proxy server");
212 if(tcpbuffer[3] == 0) {
213 logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Proxy request granted");
215 logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Proxy request rejected");
219 logger(DEBUG_CONNECTIONS, LOG_ERR, "c->tcplen set but c->node is NULL!");
223 if(c->allow_request == ALL) {
224 receive_tcppacket(c, tcpbuffer, c->tcplen);
226 logger(DEBUG_CONNECTIONS, LOG_ERR, "Got unauthorized TCP packet from %s (%s)", c->name, c->hostname);
234 /* Otherwise we are waiting for a request */
236 char *request = buffer_readline(&c->inbuf);
238 bool result = receive_request(c, request);