X-Git-Url: https://www.tinc-vpn.org/git/browse?a=blobdiff_plain;ds=sidebyside;f=src%2Fpokey%2Fmeta.c;fp=src%2Fpokey%2Fmeta.c;h=c3138e3a74490667ed5a0c2d5288c0ce5f9e0971;hb=04d33be4bd102de67bb6dba5c449e12fea0db4d2;hp=0000000000000000000000000000000000000000;hpb=b0a676988a8da3120e64ef0e1a4ea4c28b1511e1;p=tinc

diff --git a/src/pokey/meta.c b/src/pokey/meta.c
new file mode 100644
index 00000000..c3138e3a
--- /dev/null
+++ b/src/pokey/meta.c
@@ -0,0 +1,190 @@
+/*
+    meta.c -- handle the meta communication
+    Copyright (C) 2000-2002 Guus Sliepen <guus@sliepen.warande.net>,
+                  2000-2002 Ivo Timmermans <itimmermans@bigfoot.com>
+
+    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
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    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: meta.c,v 1.1 2002/04/28 12:46:26 zarq Exp $
+*/
+
+#include "config.h"
+#include <utils.h>
+#include <avl_tree.h>
+
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+/* This line must be below the rest for FreeBSD */
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#include <openssl/evp.h>
+
+#include "net.h"
+#include "connection.h"
+#include "interface.h"
+#include "system.h"
+#include "protocol.h"
+#include "logging.h"
+
+int send_meta(connection_t *c, char *buffer, int length)
+{
+  char *bufp;
+  int outlen;
+  char outbuf[MAXBUFSIZE];
+cp
+  log(DEBUG_META, TLOG_DEBUG,
+      _("Sending %d bytes of metadata to %s (%s)"),
+      length, c->name, c->hostname);
+
+  if(c->status.encryptout)
+    {
+      EVP_EncryptUpdate(c->outctx, outbuf, &outlen, buffer, length);
+      bufp = outbuf;
+      length = outlen;
+    }
+  else
+      bufp = buffer;
+
+  if(write(c->socket, bufp, length) < 0)
+    {
+      syslog(LOG_ERR, _("Sending meta data to %s (%s) failed: %s"), c->name, c->hostname, strerror(errno));
+      return -1;
+    }
+cp
+  return 0;
+}
+
+void broadcast_meta(connection_t *from, char *buffer, int length)
+{
+  avl_node_t *node;
+  connection_t *c;
+cp
+  for(node = connection_tree->head; node; node = node->next)
+    {
+      c = (connection_t *)node->data;
+      if(c != from && c->status.active)
+        send_meta(c, buffer, length);
+    }
+cp
+}
+
+int receive_meta(connection_t *c)
+{
+  int x, l = sizeof(x);
+  int oldlen, i;
+  int lenin, reqlen;
+  int decrypted = 0;
+  char inbuf[MAXBUFSIZE];
+cp
+  if(getsockopt(c->socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0)
+    {
+      syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%s %s (%s)"), __FILE__, __LINE__, c->socket, strerror(errno),
+             c->name, c->hostname);
+      return -1;
+    }
+  if(x)
+    {
+      syslog(LOG_ERR, _("Metadata socket error for %s (%s): %s"),
+             c->name, c->hostname, strerror(x));
+      return -1;
+    }
+
+  /* Strategy:
+     - Read as much as possible from the TCP socket in one go.
+     - Decrypt it.
+     - Check if a full request is in the input buffer.
+       - If yes, process request and remove it from the buffer,
+         then check again.
+       - If not, keep stuff in buffer and exit.
+   */
+
+  lenin = read(c->socket, c->buffer + c->buflen, MAXBUFSIZE - c->buflen);
+
+  if(lenin<=0)
+    {
+      if(lenin==0)
+        {
+          if(debug_lvl >= DEBUG_CONNECTIONS)
+            syslog(LOG_NOTICE, _("Connection closed by %s (%s)"),
+                c->name, c->hostname);
+        }
+      else
+        if(errno==EINTR)
+          return 0;      
+        else
+          syslog(LOG_ERR, _("Metadata socket read error for %s (%s): %s"),
+                 c->name, c->hostname, strerror(errno));
+
+      return -1;
+    }
+
+  oldlen = c->buflen;
+  c->buflen += lenin;
+
+  while(lenin)
+    {
+      /* Decrypt */
+
+      if(c->status.decryptin && !decrypted)
+        {
+          EVP_DecryptUpdate(c->inctx, inbuf, &lenin, c->buffer + oldlen, lenin);
+          memcpy(c->buffer + oldlen, inbuf, lenin);
+          decrypted = 1;
+        }
+
+      /* Otherwise we are waiting for a request */
+
+      reqlen = 0;
+
+      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;
+            }
+        }
+
+      if(reqlen)
+        {
+          if(receive_request(c))
+            return -1;
+
+          c->buflen -= reqlen;
+          lenin -= reqlen;
+          memmove(c->buffer, c->buffer + reqlen, c->buflen);
+          oldlen = 0;
+          continue;
+        }
+      else
+        {
+          break;
+        }
+    }
+
+  if(c->buflen >= MAXBUFSIZE)
+    {
+      syslog(LOG_ERR, _("Metadata read buffer overflow for %s (%s)"),
+	     c->name, c->hostname);
+      return -1;
+    }
+
+  c->last_ping_time = now;
+cp  
+  return 0;
+}