Update copyright information.

[oweals/tinc.git] / src / meta.c

diff --git a/src/meta.c b/src/meta.c
index dde0e2a4fce9b2c2130c21f32ac7be15114ec21d..91ebf01dfeadeaa6cd1b711f45f41e24c0f36190 100644 (file)
--- a/src/meta.c
+++ b/src/meta.c
@@ -1,7 +1,7 @@
 /*
     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) 2000-2009 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
@@ -17,7 +17,7 @@
     along with this program; if not, write to the Free Software
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
-    $Id: meta.c,v 1.1.2.47 2003/10/11 14:18:52 guus Exp $
+    $Id$
 */
 
 #include "system.h"
@@ -31,50 +31,93 @@
 #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) {
-               result = EVP_EncryptUpdate(c->outctx, outbuf, &outlen, buffer, length);
-               if(!result || outlen != length) {
+               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();
                }
-               bufp = outbuf;
-               length = outlen;
-       } else
-               bufp = buffer;
+               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(length) {
-               result = send(c->socket, bufp, length, 0);
+       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;
 }
 
@@ -133,7 +176,7 @@ bool receive_meta(connection_t *c)
                /* Decrypt */
 
                if(c->status.decryptin && !decrypted) {
-                       result = EVP_DecryptUpdate(c->inctx, inbuf, &lenout, 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));
@@ -150,7 +193,7 @@ bool receive_meta(connection_t *c)
                                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;