remove old xxx-separate-streams-by-port.txt idea

doc/spec/proposals/ideas/xxx-separate-streams-by-port.txt

@@ -1,59 +0,0 @@
-Filename: xxx-separate-streams-by-port.txt
-Title: Separate streams across circuits by destination port
-Author: Robert Hogan
-Created: 21-Oct-2008
-Status: Draft
-
-Here's a patch Robert Hogan wrote to use only one destination port per
-circuit. It's based on a wishlist item Roger wrote, to never send AIM
-usernames over the same circuit that we're hoping to browse anonymously
-through. The remaining open question is: how many extra circuits does this
-cause an ordinary user to create? My guess is not very many, but I'm wary
-of putting this in until we have some better estimate. On the other hand,
-not putting it in means that we have a known security flaw. Hm.
-
-Index: src/or/or.h
-===================================================================
---- src/or/or.h (revision 17143)
-+++ src/or/or.h (working copy)
-@@ -1874,6 +1874,7 @@
-
-   uint8_t state; /**< Current status of this circuit. */
-   uint8_t purpose; /**< Why are we creating this circuit? */
-+  uint16_t service; /**< Port conn must have to use this circuit. */
-
-   /** How many relay data cells can we package (read from edge streams)
-    * on this circuit before we receive a circuit-level sendme cell asking
-Index: src/or/circuituse.c
-===================================================================
---- src/or/circuituse.c (revision 17143)
-+++ src/or/circuituse.c (working copy)
-@@ -62,10 +62,16 @@
-       return 0;
-   }
-
--  if (purpose == CIRCUIT_PURPOSE_C_GENERAL)
-+  if (purpose == CIRCUIT_PURPOSE_C_GENERAL) {
-     if (circ->timestamp_dirty &&
-        circ->timestamp_dirty+get_options()->MaxCircuitDirtiness <= now)
-       return 0;
-+    /* If the circuit is dirty and used for services on another port,
-+      then it is not suitable. */
-+    if (circ->service && conn->socks_request->port &&
-+       (circ->service != conn->socks_request->port))
-+      return 0;
-+  }
-
-   /* decide if this circ is suitable for this conn */
-
-@@ -1351,7 +1357,9 @@
-     if (connection_ap_handshake_send_resolve(conn) < 0)
-       return -1;
-   }
--
-+  if (conn->socks_request->port
-+     && (TO_CIRCUIT(circ)->purpose == CIRCUIT_PURPOSE_C_GENERAL))
-+    TO_CIRCUIT(circ)->service = conn->socks_request->port;
-   return 1;
- }
-