/*
meta.c -- handle the meta communication
- Copyright (C) 2000-2003 Guus Sliepen <guus@sliepen.eu.org>,
- 2000-2003 Ivo Timmermans <ivo@o2w.nl>
+ Copyright (C) 2000-2006 Guus Sliepen <guus@tinc-vpn.org>,
+ 2000-2005 Ivo Timmermans
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
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: meta.c,v 1.1.2.42 2003/08/16 12:40:00 guus Exp $
+ $Id$
*/
#include "system.h"
+#include <openssl/err.h>
#include <openssl/evp.h>
#include "avl_tree.h"
#include "meta.h"
#include "net.h"
#include "protocol.h"
-#include "system.h"
#include "utils.h"
+#include "xalloc.h"
bool send_meta(connection_t *c, const char *buffer, int length)
{
- const char *bufp;
int outlen;
- char outbuf[MAXBUFSIZE];
int result;
cp();
+ if(!c) {
+ logger(LOG_ERR, _("send_meta() called with NULL pointer!"));
+ abort();
+ }
+
ifdebug(META) logger(LOG_DEBUG, _("Sending %d bytes of metadata to %s (%s)"), length,
c->name, c->hostname);
+ if(!c->outbuflen)
+ c->last_flushed_time = now;
+
+ /* Find room in connection's buffer */
+ if(length + c->outbuflen > c->outbufsize) {
+ c->outbufsize = length + c->outbuflen;
+ c->outbuf = xrealloc(c->outbuf, c->outbufsize);
+ }
+
+ if(length + c->outbuflen + c->outbufstart > c->outbufsize) {
+ memmove(c->outbuf, c->outbuf + c->outbufstart, c->outbuflen);
+ c->outbufstart = 0;
+ }
+
+ /* Add our data to buffer */
if(c->status.encryptout) {
- EVP_EncryptUpdate(c->outctx, outbuf, &outlen, buffer, length);
- bufp = outbuf;
- length = outlen;
- } else
- bufp = buffer;
-
- while(length) {
- result = send(c->socket, bufp, length, 0);
+ 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));
+ return false;
+ } else if(outlen > length) {
+ logger(LOG_EMERG, _("Encrypted data too long! Heap corrupted!"));
+ abort();
+ }
+ c->outbuflen += outlen;
+ } else {
+ memcpy(c->outbuf + c->outbufstart + c->outbuflen, buffer, length);
+ c->outbuflen += length;
+ }
+
+ 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)
+ } else if(errno == EINTR) {
continue;
- else
- logger(LOG_ERR, _("Sending meta data to %s (%s) failed: %s"), c->name,
+#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));
+ }
+
return false;
}
- bufp += result;
- length -= result;
+
+ c->outbufstart += result;
+ c->outbuflen -= result;
}
-
+
+ c->outbufstart = 0; /* avoid unnecessary memmoves */
return true;
}
cp();
for(node = connection_tree->head; node; node = node->next) {
- c = (connection_t *) node->data;
+ c = node->data;
if(c != from && c->status.active)
send_meta(c, buffer, length);
bool receive_meta(connection_t *c)
{
- int x;
- socklen_t l = sizeof(x);
- int oldlen, i;
- int lenin, reqlen;
+ int oldlen, i, result;
+ int lenin, lenout, reqlen;
bool decrypted = false;
char inbuf[MAXBUFSIZE];
oldlen = c->buflen;
c->buflen += lenin;
- while(lenin) {
+ while(lenin > 0) {
/* Decrypt */
if(c->status.decryptin && !decrypted) {
- EVP_DecryptUpdate(c->inctx, inbuf, &lenin, c->buffer + oldlen, lenin);
+ 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;
}
receive_tcppacket(c, c->buffer, c->tcplen);
c->buflen -= c->tcplen;
- lenin -= c->tcplen;
+ lenin -= c->tcplen - oldlen;
memmove(c->buffer, c->buffer + c->tcplen, c->buflen);
oldlen = 0;
c->tcplen = 0;
return false;
c->buflen -= reqlen;
- lenin -= reqlen;
+ lenin -= reqlen - oldlen;
memmove(c->buffer, c->buffer + reqlen, c->buflen);
oldlen = 0;
continue;
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