Move literally everything out of src/or

This commit won't build yet -- it just puts everything in a slightly
more logical place.

The reasoning here is that "src/core" will hold the stuff that every (or
nearly every) tor instance will need in order to do onion routing.
Other features (including some necessary ones) will live in
"src/feature".  The "src/app" directory will hold the stuff needed
to have Tor be an application you can actually run.

This commit DOES NOT refactor the former contents of src/or into a
logical set of acyclic libraries, or change any code at all.  That
will have to come in the future.

We will continue to move things around and split them in the future,
but I hope this lays a reasonable groundwork for doing so.

1 files changed, 102 insertions, 0 deletions

diff --git a/src/feature/nodelist/node_st.h b/src/feature/nodelist/node_st.h
new file mode 100644
index 0000000000..d56ce27884
--- /dev/null
+++ b/src/feature/nodelist/node_st.h
@@ -0,0 +1,102 @@
+/* Copyright (c) 2001 Matej Pfajfar.
+ * Copyright (c) 2001-2004, Roger Dingledine.
+ * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
+ * Copyright (c) 2007-2018, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+#ifndef NODE_ST_H
+#define NODE_ST_H
+
+#include "or/hsdir_index_st.h"
+#include "lib/crypt_ops/crypto_ed25519.h"
+
+/** A node_t represents a Tor router.
+ *
+ * Specifically, a node_t is a Tor router as we are using it: a router that
+ * we are considering for circuits, connections, and so on.  A node_t is a
+ * thin wrapper around the routerstatus, routerinfo, and microdesc for a
+ * single router, and provides a consistent interface for all of them.
+ *
+ * Also, a node_t has mutable state.  While a routerinfo, a routerstatus,
+ * and a microdesc have[*] only the information read from a router
+ * descriptor, a consensus entry, and a microdescriptor (respectively)...
+ * a node_t has flags based on *our own current opinion* of the node.
+ *
+ * [*] Actually, there is some leftover information in each that is mutable.
+ *  We should try to excise that.
+ */
+struct node_t {
+  /* Indexing information */
+
+  /** Used to look up the node_t by its identity digest. */
+  HT_ENTRY(node_t) ht_ent;
+  /** Used to look up the node_t by its ed25519 identity digest. */
+  HT_ENTRY(node_t) ed_ht_ent;
+  /** Position of the node within the list of nodes */
+  int nodelist_idx;
+
+  /** The identity digest of this node_t.  No more than one node_t per
+   * identity may exist at a time. */
+  char identity[DIGEST_LEN];
+
+  /** The ed25519 identity of this node_t. This field is nonzero iff we
+   * currently have an ed25519 identity for this node in either md or ri,
+   * _and_ this node has been inserted to the ed25519-to-node map in the
+   * nodelist.
+   */
+  ed25519_public_key_t ed25519_id;
+
+  microdesc_t *md;
+  routerinfo_t *ri;
+  routerstatus_t *rs;
+
+  /* local info: copied from routerstatus, then possibly frobbed based
+   * on experience.  Authorities set this stuff directly.  Note that
+   * these reflect knowledge of the primary (IPv4) OR port only.  */
+
+  unsigned int is_running:1; /**< As far as we know, is this OR currently
+                              * running? */
+  unsigned int is_valid:1; /**< Has a trusted dirserver validated this OR?
+                            *  (For Authdir: Have we validated this OR?) */
+  unsigned int is_fast:1; /** Do we think this is a fast OR? */
+  unsigned int is_stable:1; /** Do we think this is a stable OR? */
+  unsigned int is_possible_guard:1; /**< Do we think this is an OK guard? */
+  unsigned int is_exit:1; /**< Do we think this is an OK exit? */
+  unsigned int is_bad_exit:1; /**< Do we think this exit is censored, borked,
+                               * or otherwise nasty? */
+  unsigned int is_hs_dir:1; /**< True iff this router is a hidden service
+                             * directory according to the authorities. */
+
+  /* Local info: warning state. */
+
+  unsigned int name_lookup_warned:1; /**< Have we warned the user for referring
+                                      * to this (unnamed) router by nickname?
+                                      */
+
+  /** Local info: we treat this node as if it rejects everything */
+  unsigned int rejects_all:1;
+
+  /* Local info: derived. */
+
+  /** True if the IPv6 OR port is preferred over the IPv4 OR port.
+   * XX/teor - can this become out of date if the torrc changes? */
+  unsigned int ipv6_preferred:1;
+
+  /** According to the geoip db what country is this router in? */
+  /* XXXprop186 what is this suppose to mean with multiple OR ports? */
+  country_t country;
+
+  /* The below items are used only by authdirservers for
+   * reachability testing. */
+
+  /** When was the last time we could reach this OR? */
+  time_t last_reachable;        /* IPv4. */
+  time_t last_reachable6;       /* IPv6. */
+
+  /* Hidden service directory index data. This is used by a service or client
+   * in order to know what's the hs directory index for this node at the time
+   * the consensus is set. */
+  struct hsdir_index_t hsdir_index;
+};
+
+#endif