/*
meta.c -- handle the meta communication
- Copyright (C) 2000-2006 Guus Sliepen <guus@tinc-vpn.org>,
+ Copyright (C) 2000-2014 Guus Sliepen <guus@tinc-vpn.org>,
2000-2005 Ivo Timmermans
+ 2006 Scott Lamb <slamb@slamb.org>
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
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.
-
- $Id$
+ 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.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "system.h"
-#include <openssl/err.h>
-#include <openssl/evp.h>
-
-#include "avl_tree.h"
+#include "cipher.h"
#include "connection.h"
#include "logger.h"
#include "meta.h"
#include "utils.h"
#include "xalloc.h"
-bool send_meta(connection_t *c, const char *buffer, int length)
-{
- int outlen;
- int result;
+#ifndef MIN
+#define MIN(x, y) (((x)<(y))?(x):(y))
+#endif
- cp();
+bool send_meta_sptps(void *handle, uint8_t type, const void *buffer, size_t length) {
+ connection_t *c = handle;
- ifdebug(META) logger(LOG_DEBUG, _("Sending %d bytes of metadata to %s (%s)"), length,
- c->name, c->hostname);
+ if(!c) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "send_meta_sptps() called with NULL pointer!");
+ abort();
+ }
- if(!c->outbuflen)
- c->last_flushed_time = now;
+ buffer_add(&c->outbuf, buffer, length);
+ io_set(&c->io, IO_READ | IO_WRITE);
- /* Find room in connection's buffer */
- if(length + c->outbuflen > c->outbufsize) {
- c->outbufsize = length + c->outbuflen;
- c->outbuf = xrealloc(c->outbuf, c->outbufsize);
- }
+ return true;
+}
- if(length + c->outbuflen + c->outbufstart > c->outbufsize) {
- memmove(c->outbuf, c->outbuf + c->outbufstart, c->outbuflen);
- c->outbufstart = 0;
+bool send_meta(connection_t *c, const char *buffer, int length) {
+ if(!c) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "send_meta() called with NULL pointer!");
+ abort();
}
+ logger(DEBUG_META, LOG_DEBUG, "Sending %d bytes of metadata to %s (%s)", length,
+ c->name, c->hostname);
+
+ if(c->protocol_minor >= 2)
+ return sptps_send_record(&c->sptps, 0, buffer, length);
+
/* Add our data to buffer */
if(c->status.encryptout) {
- result = EVP_EncryptUpdate(c->outctx, (unsigned char *)c->outbuf + c->outbufstart + c->outbuflen,
- &outlen, (unsigned char *)buffer, length);
- if(!result || outlen < length) {
- logger(LOG_ERR, _("Error while encrypting metadata to %s (%s): %s"),
- c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
+#ifdef DISABLE_LEGACY
+ return false;
+#else
+ size_t outlen = length;
+
+ if(!cipher_encrypt(c->outcipher, buffer, length, buffer_prepare(&c->outbuf, length), &outlen, false) || outlen != length) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Error while encrypting metadata to %s (%s)",
+ c->name, c->hostname);
return false;
- } else if(outlen > length) {
- logger(LOG_EMERG, _("Encrypted data too long! Heap corrupted!"));
- abort();
}
- c->outbuflen += outlen;
+#endif
} else {
- memcpy(c->outbuf + c->outbufstart + c->outbuflen, buffer, length);
- c->outbuflen += length;
+ buffer_add(&c->outbuf, buffer, length);
}
+ io_set(&c->io, IO_READ | IO_WRITE);
+
return true;
}
-bool flush_meta(connection_t *c)
-{
- int result;
-
- ifdebug(META) logger(LOG_DEBUG, _("Flushing %d bytes to %s (%s)"),
- c->outbuflen, c->name, c->hostname);
-
- while(c->outbuflen) {
- result = send(c->socket, c->outbuf + c->outbufstart, c->outbuflen, 0);
- if(result <= 0) {
- if(!errno || errno == EPIPE) {
- ifdebug(CONNECTIONS) logger(LOG_NOTICE, _("Connection closed by %s (%s)"),
- c->name, c->hostname);
- } else if(errno == EINTR) {
- continue;
-#ifdef EWOULDBLOCK
- } else if(errno == EWOULDBLOCK) {
- ifdebug(CONNECTIONS) logger(LOG_DEBUG, _("Flushing %d bytes to %s (%s) would block"),
- c->outbuflen, c->name, c->hostname);
- return true;
-#endif
- } else {
- logger(LOG_ERR, _("Flushing meta data to %s (%s) failed: %s"), c->name,
- c->hostname, strerror(errno));
- }
+void send_meta_raw(connection_t *c, const char *buffer, int length) {
+ if(!c) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "send_meta() called with NULL pointer!");
+ abort();
+ }
- return false;
- }
+ logger(DEBUG_META, LOG_DEBUG, "Sending %d bytes of raw metadata to %s (%s)", length,
+ c->name, c->hostname);
- c->outbufstart += result;
- c->outbuflen -= result;
- }
+ buffer_add(&c->outbuf, buffer, length);
- c->outbufstart = 0; /* avoid unnecessary memmoves */
- return true;
+ io_set(&c->io, IO_READ | IO_WRITE);
}
-void broadcast_meta(connection_t *from, const char *buffer, int length)
-{
- avl_node_t *node;
- connection_t *c;
+void broadcast_meta(connection_t *from, const char *buffer, int length) {
+ for list_each(connection_t, c, connection_list)
+ if(c != from && c->edge)
+ send_meta(c, buffer, length);
+}
- cp();
+bool receive_meta_sptps(void *handle, uint8_t type, const void *vdata, uint16_t length) {
+ const char *data = vdata;
+ connection_t *c = handle;
- for(node = connection_tree->head; node; node = node->next) {
- c = node->data;
+ if(!c) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "receive_meta_sptps() called with NULL pointer!");
+ abort();
+ }
- if(c != from && c->status.active)
- send_meta(c, buffer, length);
+ if(type == SPTPS_HANDSHAKE) {
+ if(c->allow_request == ACK)
+ return send_ack(c);
+ else
+ return true;
}
+
+ if(!data)
+ return true;
+
+ /* Are we receiving a TCPpacket? */
+
+ if(c->tcplen) {
+ if(length != c->tcplen)
+ return false;
+ receive_tcppacket(c, data, length);
+ c->tcplen = 0;
+ return true;
+ }
+
+ /* Change newline to null byte, just like non-SPTPS requests */
+
+ if(data[length - 1] == '\n')
+ ((char *)data)[length - 1] = 0;
+
+ /* Otherwise we are waiting for a request */
+
+ return receive_request(c, data);
}
-bool receive_meta(connection_t *c)
-{
- int oldlen, i, result;
- int lenin, lenout, reqlen;
- bool decrypted = false;
+bool receive_meta(connection_t *c) {
+ int inlen;
char inbuf[MAXBUFSIZE];
-
- cp();
+ char *bufp = inbuf, *endp;
/* Strategy:
- Read as much as possible from the TCP socket in one go.
- If not, keep stuff in buffer and exit.
*/
- lenin = recv(c->socket, c->buffer + c->buflen, MAXBUFSIZE - c->buflen, 0);
+ buffer_compact(&c->inbuf, MAXBUFSIZE);
- if(lenin <= 0) {
- if(!lenin || !errno) {
- ifdebug(CONNECTIONS) logger(LOG_NOTICE, _("Connection closed by %s (%s)"),
+ if(sizeof inbuf <= c->inbuf.len) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Input buffer full for %s (%s)", c->name, c->hostname);
+ return false;
+ }
+
+ inlen = recv(c->socket, inbuf, sizeof inbuf - c->inbuf.len, 0);
+
+ if(inlen <= 0) {
+ if(!inlen || !sockerrno) {
+ logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection closed by %s (%s)",
c->name, c->hostname);
- } else if(errno == EINTR)
+ } else if(sockwouldblock(sockerrno))
return true;
else
- logger(LOG_ERR, _("Metadata socket read error for %s (%s): %s"),
- c->name, c->hostname, strerror(errno));
-
+ logger(DEBUG_ALWAYS, LOG_ERR, "Metadata socket read error for %s (%s): %s",
+ c->name, c->hostname, sockstrerror(sockerrno));
return false;
}
- oldlen = c->buflen;
- c->buflen += lenin;
+ do {
+ /* Are we receiving a SPTPS packet? */
- while(lenin > 0) {
- /* Decrypt */
+ if(c->sptpslen) {
+ int len = MIN(inlen, c->sptpslen - c->inbuf.len);
+ buffer_add(&c->inbuf, bufp, len);
- if(c->status.decryptin && !decrypted) {
- result = EVP_DecryptUpdate(c->inctx, (unsigned char *)inbuf, &lenout, (unsigned char *)c->buffer + oldlen, lenin);
- if(!result || lenout != lenin) {
- logger(LOG_ERR, _("Error while decrypting metadata from %s (%s): %s"),
- c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
- return false;
- }
- memcpy(c->buffer + oldlen, inbuf, lenin);
- decrypted = true;
- }
+ char *sptpspacket = buffer_read(&c->inbuf, c->sptpslen);
+ if(!sptpspacket)
+ return true;
- /* Are we receiving a TCPpacket? */
+ if(!receive_tcppacket_sptps(c, sptpspacket, c->sptpslen))
+ return false;
+ c->sptpslen = 0;
- if(c->tcplen) {
- if(c->tcplen <= c->buflen) {
- receive_tcppacket(c, c->buffer, c->tcplen);
+ bufp += len;
+ inlen -= len;
+ continue;
+ }
- c->buflen -= c->tcplen;
- lenin -= c->tcplen - oldlen;
- memmove(c->buffer, c->buffer + c->tcplen, c->buflen);
- oldlen = 0;
- c->tcplen = 0;
- continue;
- } else {
- break;
- }
+ if(c->protocol_minor >= 2) {
+ int len = sptps_receive_data(&c->sptps, bufp, inlen);
+ if(!len)
+ return false;
+ bufp += len;
+ inlen -= len;
+ continue;
}
- /* Otherwise we are waiting for a request */
+ if(!c->status.decryptin) {
+ endp = memchr(bufp, '\n', inlen);
+ if(endp)
+ endp++;
+ else
+ endp = bufp + inlen;
- reqlen = 0;
+ buffer_add(&c->inbuf, bufp, endp - bufp);
- for(i = oldlen; i < c->buflen; i++) {
- if(c->buffer[i] == '\n') {
- c->buffer[i] = '\0'; /* replace end-of-line by end-of-string so we can use sscanf */
- reqlen = i + 1;
- break;
- }
- }
+ inlen -= endp - bufp;
+ bufp = endp;
+ } else {
+#ifdef DISABLE_LEGACY
+ return false;
+#else
+ size_t outlen = inlen;
- if(reqlen) {
- c->reqlen = reqlen;
- if(!receive_request(c))
+ if(!cipher_decrypt(c->incipher, bufp, inlen, buffer_prepare(&c->inbuf, inlen), &outlen, false) || inlen != outlen) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Error while decrypting metadata from %s (%s)",
+ c->name, c->hostname);
return false;
+ }
- c->buflen -= reqlen;
- lenin -= reqlen - oldlen;
- memmove(c->buffer, c->buffer + reqlen, c->buflen);
- oldlen = 0;
- continue;
- } else {
- break;
+ inlen = 0;
+#endif
}
- }
- if(c->buflen >= MAXBUFSIZE) {
- logger(LOG_ERR, _("Metadata read buffer overflow for %s (%s)"),
- c->name, c->hostname);
- return false;
- }
+ while(c->inbuf.len) {
+ /* Are we receiving a TCPpacket? */
+
+ if(c->tcplen) {
+ char *tcpbuffer = buffer_read(&c->inbuf, c->tcplen);
+ if(!tcpbuffer)
+ break;
+
+ if(!c->node) {
+ if(c->outgoing && proxytype == PROXY_SOCKS4 && c->allow_request == ID) {
+ if(tcpbuffer[0] == 0 && tcpbuffer[1] == 0x5a) {
+ logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Proxy request granted");
+ } else {
+ logger(DEBUG_CONNECTIONS, LOG_ERR, "Proxy request rejected");
+ return false;
+ }
+ } else if(c->outgoing && proxytype == PROXY_SOCKS5 && c->allow_request == ID) {
+ if(tcpbuffer[0] != 5) {
+ logger(DEBUG_CONNECTIONS, LOG_ERR, "Invalid response from proxy server");
+ return false;
+ }
+ if(tcpbuffer[1] == (char)0xff) {
+ logger(DEBUG_CONNECTIONS, LOG_ERR, "Proxy request rejected: unsuitable authentication method");
+ return false;
+ }
+ if(tcpbuffer[2] != 5) {
+ logger(DEBUG_CONNECTIONS, LOG_ERR, "Invalid response from proxy server");
+ return false;
+ }
+ if(tcpbuffer[3] == 0) {
+ logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Proxy request granted");
+ } else {
+ logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Proxy request rejected");
+ return false;
+ }
+ } else {
+ logger(DEBUG_CONNECTIONS, LOG_ERR, "c->tcplen set but c->node is NULL!");
+ abort();
+ }
+ } else {
+ if(c->allow_request == ALL) {
+ receive_tcppacket(c, tcpbuffer, c->tcplen);
+ } else {
+ logger(DEBUG_CONNECTIONS, LOG_ERR, "Got unauthorized TCP packet from %s (%s)", c->name, c->hostname);
+ return false;
+ }
+ }
+
+ c->tcplen = 0;
+ }
+
+ /* Otherwise we are waiting for a request */
- c->last_ping_time = now;
+ char *request = buffer_readline(&c->inbuf);
+ if(request) {
+ bool result = receive_request(c, request);
+ if(!result)
+ return false;
+ continue;
+ } else {
+ break;
+ }
+ }
+ } while(inlen);
return true;
}
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