#include "mesh.h"
#include "mesh_tunnel_tree.h"
+#define MESH_TREE_DEBUG GNUNET_YES
-static void
-debug_node(struct MeshTunnelTreeNode *n, uint16_t level)
+
+/**
+ * Node of path tree for a tunnel
+ */
+struct MeshTunnelTreeNode
{
- struct MeshTunnelTreeNode *c;
- uint16_t i;
+ /**
+ * Peer this node describes
+ */
+ GNUNET_PEER_Id peer;
- for (i = 0; i < level; i++)
- fprintf(stderr, " ");
- if (n->status == MESH_PEER_READY)
- fprintf(stderr, "#");
- if (n->status == MESH_PEER_SEARCHING)
- fprintf(stderr, "+");
- if (n->status == MESH_PEER_RELAY)
- fprintf(stderr, "-");
- if (n->status == MESH_PEER_RECONNECTING)
- fprintf(stderr, "*");
-
- fprintf(stderr, "%u [%p] ", n->peer, n);
- if (NULL != n->parent)
- fprintf(stderr, "(-> %u)\n", n->parent->peer);
- else
- fprintf(stderr, "(root)\n");
- for (c = n->children_head; NULL != c; c = c->next)
- debug_node(c, level + 1);
-}
+ /**
+ * Parent node in the tree
+ */
+ struct MeshTunnelTreeNode *parent;
+ /**
+ * DLL of siblings
+ */
+ struct MeshTunnelTreeNode *next;
+ /**
+ * DLL of siblings
+ */
+ struct MeshTunnelTreeNode *prev;
-void
-tree_debug(struct MeshTunnelTree *t)
+ /**
+ * DLL of children
+ */
+ struct MeshTunnelTreeNode *children_head;
+
+ /**
+ * DLL of children
+ */
+ struct MeshTunnelTreeNode *children_tail;
+
+ /**
+ * Status of the peer in the tunnel
+ */
+ enum MeshPeerState status;
+};
+
+
+/**
+ * Tree to reach all peers in the tunnel
+ */
+struct MeshTunnelTree
{
- debug_node(t->root, 0);
-}
+ /**
+ * Root node of peer tree
+ */
+ struct MeshTunnelTreeNode *root;
+ /**
+ * Node that represents our position in the tree (for non local tunnels)
+ */
+ struct MeshTunnelTreeNode *me;
+
+ /**
+ * DLL of disconneted nodes
+ */
+ struct MeshTunnelTreeNode *disconnected_head;
+
+ /**
+ * DLL of disconneted nodes
+ */
+ struct MeshTunnelTreeNode *disconnected_tail;
+
+ /**
+ * Cache of all peers and the first hop to them.
+ * Indexed by PeerIdentity, contains a pointer to the PeerIdentity
+ * of 1st hop.
+ */
+ struct GNUNET_CONTAINER_MultiHashMap *first_hops;
+
+};
+
+
+/**
+ * Create a new path
+ *
+ * @param length How many hops will the path have.
+ *
+ * @return A newly allocated path with a peer array of the specified length.
+ */
+struct MeshPeerPath *
+path_new (unsigned int length)
+{
+ struct MeshPeerPath *p;
+
+ p = GNUNET_malloc (sizeof (struct MeshPeerPath));
+ if (length > 0)
+ {
+ p->length = length;
+ p->peers = GNUNET_malloc (length * sizeof (GNUNET_PEER_Id));
+ }
+ return p;
+}
/**
* Invert the path
*
- * @param p the path to invert
+ * @param path the path to invert
*/
void
path_invert (struct MeshPeerPath *path)
/**
- * Destroy the path and free any allocated resources linked to it
+ * Duplicate a path, incrementing short peer's rc.
*
- * @param p the path to destroy
- *
- * @return GNUNET_OK on success
+ * @param path The path to duplicate.
*/
-int
-path_destroy (struct MeshPeerPath *p)
+struct MeshPeerPath *
+path_duplicate (struct MeshPeerPath *path)
{
- GNUNET_PEER_decrement_rcs (p->peers, p->length);
- GNUNET_free (p->peers);
- GNUNET_free (p);
- return GNUNET_OK;
+ struct MeshPeerPath *aux;
+ unsigned int i;
+
+ aux = path_new (path->length);
+ memcpy (aux->peers, path->peers, path->length * sizeof (GNUNET_PEER_Id));
+ for (i = 0; i < path->length; i++)
+ GNUNET_PEER_change_rc (path->peers[i], 1);
+ return aux;
}
/**
- * Find the first peer whom to send a packet to go down this path
- *
- * @param t The tunnel tree to use
- * @param peer The peerinfo of the peer we are trying to reach
+ * Recusively update the info about what is the first hop to reach the node
*
- * @return peerinfo of the peer who is the first hop in the tunnel
- * NULL on error
+ * @param tree Tree this nodes belongs to.
+ * @param parent The node form which to start updating.
+ * @param hop If known, ID of the first hop.
+ * If not known, NULL to find out and pass on children.
*/
-struct GNUNET_PeerIdentity *
-path_get_first_hop (struct MeshTunnelTree *t, GNUNET_PEER_Id peer)
-{
- struct GNUNET_PeerIdentity id;
-
- GNUNET_PEER_resolve (peer, &id);
- return GNUNET_CONTAINER_multihashmap_get (t->first_hops,
- &id.hashPubKey);
-}
+static void
+tree_node_update_first_hops (struct MeshTunnelTree *tree,
+ struct MeshTunnelTreeNode *parent,
+ struct GNUNET_PeerIdentity *hop);
/**
- * Get the length of a path
+ * Get the length of a path.
*
- * @param path The path to measure, with the local peer at any point of it
+ * @param path The path to measure, with the local peer at any point of it.
*
- * @return Number of hops to reach destination
- * UINT_MAX in case the peer is not in the path
+ * @return Number of hops to reach destination.
+ * UINT_MAX in case the peer is not in the path.
*/
unsigned int
path_get_length (struct MeshPeerPath *path)
/**
- * Get the cost of the path relative to the already built tunnel tree
+ * Destroy the path and free any allocated resources linked to it
*
- * @param t The tunnel tree to which compare
- * @param path The individual path to reach a peer
+ * @param p the path to destroy
*
- * @return Number of hops to reach destination, UINT_MAX in case the peer is not
- * in the path
+ * @return GNUNET_OK on success
+ */
+int
+path_destroy (struct MeshPeerPath *p)
+{
+ if (NULL == p)
+ return GNUNET_OK;
+ GNUNET_PEER_decrement_rcs (p->peers, p->length);
+ GNUNET_free_non_null (p->peers);
+ GNUNET_free (p);
+ return GNUNET_OK;
+}
+
+
+
+/**
+ * Allocates and initializes a new node.
+ * Sets ID and parent of the new node and inserts it in the DLL of the parent
*
- * TODO: remove dummy implementation, look into the tunnel tree
+ * @param parent Node that will be the parent from the new node, NULL for root
+ * @param peer Short Id of the new node
+ *
+ * @return Newly allocated node
*/
-unsigned int
-path_get_cost (struct MeshTunnelTree *t, struct MeshPeerPath *path)
+static struct MeshTunnelTreeNode *
+tree_node_new (struct MeshTunnelTreeNode *parent, GNUNET_PEER_Id peer)
{
- return path_get_length (path);
+ struct MeshTunnelTreeNode *node;
+
+ node = GNUNET_malloc (sizeof (struct MeshTunnelTreeNode));
+ node->peer = peer;
+ GNUNET_PEER_change_rc (peer, 1);
+ node->parent = parent;
+ if (NULL != parent)
+ GNUNET_CONTAINER_DLL_insert (parent->children_head, parent->children_tail,
+ node);
+
+ return node;
}
/**
- * Recursively find the given peer in the tree.
+ * Recursively find the given peer.
*
- * @param t Tunnel where to look for the peer.
- * @param peer Peer to find
+ * @param parent Node where to start looking.
+ * @param peer_id Short ID of the peer to find.
*
* @return Pointer to the node of the peer. NULL if not found.
*/
-struct MeshTunnelTreeNode *
-tree_find_peer (struct MeshTunnelTreeNode *parent, GNUNET_PEER_Id peer_id)
+static struct MeshTunnelTreeNode *
+tree_node_find_peer (struct MeshTunnelTreeNode *parent, GNUNET_PEER_Id peer_id)
{
struct MeshTunnelTreeNode *n;
struct MeshTunnelTreeNode *r;
return parent;
for (n = parent->children_head; NULL != n; n = n->next)
{
- r = tree_find_peer (n, peer_id);
+ r = tree_node_find_peer (n, peer_id);
if (NULL != r)
return r;
}
}
+/**
+ * Recusively update the info about what is the first hop to reach the node
+ *
+ * @param tree Tree this nodes belongs to.
+ * @param parent ID from node form which to start updating.
+ * @param hop If known, ID of the first hop.
+ * If not known, NULL to find out and pass on children.
+ */
+static void
+tree_node_update_first_hops (struct MeshTunnelTree *tree,
+ struct MeshTunnelTreeNode *parent,
+ struct GNUNET_PeerIdentity *hop)
+{
+ struct GNUNET_PeerIdentity pi;
+ struct GNUNET_PeerIdentity *copy;
+ struct GNUNET_PeerIdentity id;
+ struct MeshTunnelTreeNode *n;
+
+#if MESH_TREE_DEBUG
+ GNUNET_PEER_resolve (parent->peer, &id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "tree: Finding first hop for %s.\n",
+ GNUNET_i2s (&id));
+#endif
+ if (NULL == hop)
+ {
+ struct MeshTunnelTreeNode *aux;
+ struct MeshTunnelTreeNode *old;
+
+ aux = old = parent;
+ while (aux != tree->me)
+ {
+#if MESH_TREE_DEBUG
+ GNUNET_PEER_resolve (aux->peer, &id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "tree: ... checking %s.\n",
+ GNUNET_i2s (&id));
+#endif
+ old = aux;
+ aux = aux->parent;
+ GNUNET_assert (NULL != aux);
+ }
+#if MESH_TREE_DEBUG
+ GNUNET_PEER_resolve (old->peer, &id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "tree: It's %s!\n",
+ GNUNET_i2s (&id));
+#endif
+ hop = π
+ GNUNET_PEER_resolve (old->peer, hop);
+ }
+ GNUNET_PEER_resolve (parent->peer, &id);
+ copy = GNUNET_CONTAINER_multihashmap_get (tree->first_hops, &id.hashPubKey);
+ if (NULL == copy)
+ copy = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity));
+ *copy = *hop;
+
+ (void) GNUNET_CONTAINER_multihashmap_put (tree->first_hops, &id.hashPubKey,
+ copy,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
+
+ for (n = parent->children_head; NULL != n; n = n->next)
+ {
+ tree_node_update_first_hops (tree, n, hop);
+ }
+}
+
+
+static void
+tree_node_debug (struct MeshTunnelTreeNode *n, uint16_t level)
+{
+ struct MeshTunnelTreeNode *c;
+ struct GNUNET_PeerIdentity id;;
+ uint16_t i;
+
+ for (i = 0; i < level; i++)
+ fprintf (stderr, " ");
+ if (n->status == MESH_PEER_READY)
+ fprintf (stderr, "#");
+ if (n->status == MESH_PEER_SEARCHING)
+ fprintf (stderr, "+");
+ if (n->status == MESH_PEER_RELAY)
+ fprintf (stderr, "-");
+ if (n->status == MESH_PEER_RECONNECTING)
+ fprintf (stderr, "*");
+
+ GNUNET_PEER_resolve (n->peer, &id);
+ fprintf (stderr, "%s, [%u, %p] ", GNUNET_i2s (&id), n->peer, n);
+ if (NULL != n->parent)
+ {
+ GNUNET_PEER_resolve (n->parent->peer, &id);
+ fprintf (stderr, "(-> %s [%u])\n", GNUNET_i2s (&id), n->parent->peer);
+ }
+ else
+ fprintf (stderr, "(root)\n");
+ for (c = n->children_head; NULL != c; c = c->next)
+ tree_node_debug (c, level + 1);
+}
+
+
+/**
+ * Destroys and frees the node and all children
+ *
+ * @param parent Parent node to be destroyed
+ */
+static void
+tree_node_destroy (struct MeshTunnelTreeNode *parent)
+{
+ struct MeshTunnelTreeNode *n;
+ struct MeshTunnelTreeNode *next;
+
+#if MESH_TREE_DEBUG
+ struct GNUNET_PeerIdentity id;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "tree: Destroying node %u\n",
+ parent->peer);
+ GNUNET_PEER_resolve (parent->peer, &id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "tree: (%s)\n", GNUNET_i2s (&id));
+#endif
+ n = parent->children_head;
+ while (NULL != n)
+ {
+ next = n->next;
+ tree_node_destroy (n);
+ n = next;
+ }
+ GNUNET_PEER_change_rc (parent->peer, -1);
+ if (NULL != parent->parent)
+ GNUNET_CONTAINER_DLL_remove (parent->parent->children_head,
+ parent->parent->children_tail, parent);
+ GNUNET_free (parent);
+}
+
+
+
+/**
+ * Create a new tree.
+ *
+ * @param peer A short peer id of the root of the tree.
+ *
+ * @return A newly allocated and initialized tunnel tree.
+ */
+struct MeshTunnelTree *
+tree_new (GNUNET_PEER_Id peer)
+{
+ struct MeshTunnelTree *tree;
+
+ tree = GNUNET_malloc (sizeof (struct MeshTunnelTree));
+ tree->first_hops = GNUNET_CONTAINER_multihashmap_create (32);
+ tree->root = tree_node_new (NULL, peer);
+ tree->root->status = MESH_PEER_ROOT;
+
+ if (1 == peer)
+ {
+ tree->me = tree->root;
+ }
+
+ return tree;
+}
+
+
+/**
+ * Set the status of a node.
+ *
+ * @param tree Tree.
+ * @param peer A short peer id of the node.
+ * @param status New status to set.
+ */
+void
+tree_set_status (struct MeshTunnelTree *tree, GNUNET_PEER_Id peer,
+ enum MeshPeerState status)
+{
+ struct MeshTunnelTreeNode *n;
+
+ n = tree_find_peer (tree, peer);
+ if (NULL == n)
+ return;
+ n->status = status;
+}
+
+
+/**
+ * Get the status of a node.
+ *
+ * @param tree Tree whose node's status we want to now.
+ * @param peer A short peer id of the node.
+ *
+ * @return Status of the peer.
+ */
+enum MeshPeerState
+tree_get_status (struct MeshTunnelTree *tree, GNUNET_PEER_Id peer)
+{
+ struct MeshTunnelTreeNode *n;
+
+ n = tree_find_peer (tree, peer);
+ if (NULL == n)
+ return MESH_PEER_INVALID;
+ return n->status;
+}
+
+
+/**
+ * Get the id of the predecessor of the local node.
+ *
+ * @param tree Tree whose local id we want to now.
+ *
+ * @return Short peer id of local peer.
+ */
+GNUNET_PEER_Id
+tree_get_predecessor (struct MeshTunnelTree *tree)
+{
+ if (NULL != tree->me && NULL != tree->me->parent)
+ return tree->me->parent->peer;
+ else
+ return (GNUNET_PEER_Id) 0;
+}
+
+
+/**
+ * Find the first peer whom to send a packet to go down this path
+ *
+ * @param t The tunnel tree to use
+ * @param peer The peerinfo of the peer we are trying to reach
+ *
+ * @return peerinfo of the peer who is the first hop in the tunnel
+ * NULL on error
+ */
+struct GNUNET_PeerIdentity *
+tree_get_first_hop (struct MeshTunnelTree *t, GNUNET_PEER_Id peer)
+{
+ struct GNUNET_PeerIdentity id;
+ struct GNUNET_PeerIdentity *r;
+
+ GNUNET_PEER_resolve (peer, &id);
+ r = GNUNET_CONTAINER_multihashmap_get (t->first_hops, &id.hashPubKey);
+ if (NULL == r)
+ {
+ struct MeshTunnelTreeNode *n;
+
+ n = tree_find_peer (t, peer);
+ if (NULL != t->me && NULL != n)
+ {
+ tree_node_update_first_hops (t, n, NULL);
+ r = GNUNET_CONTAINER_multihashmap_get (t->first_hops, &id.hashPubKey);
+ GNUNET_assert (NULL != r);
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ "Tree structure inconsistent! me: %p, n: %p", t->me, n);
+ GNUNET_break (0);
+ }
+ }
+
+ return r;
+}
+
+
+/**
+ * Find the given peer in the tree.
+ *
+ * @param tree Tree where to look for the peer.
+ * @param peer_id Short ID of the peer to find.
+ *
+ * @return Pointer to the node of the peer. NULL if not found.
+ */
+struct MeshTunnelTreeNode *
+tree_find_peer (struct MeshTunnelTree *tree, GNUNET_PEER_Id peer_id)
+{
+ return tree_node_find_peer (tree->root, peer_id);
+}
+
+
/**
* Recusively mark peer and children as disconnected, notify client
*
* @param tree Tree this node belongs to
* @param parent Node to be clean, potentially with children
* @param cb Callback to use to notify about disconnected peers.
+ * @param cbcls Closure for cb.
*/
-void
+static void
tree_mark_peers_disconnected (struct MeshTunnelTree *tree,
struct MeshTunnelTreeNode *parent,
- MeshNodeDisconnectCB cb)
+ MeshTreeCallback cb, void *cbcls)
{
struct GNUNET_PeerIdentity *pi;
struct GNUNET_PeerIdentity id;
for (n = parent->children_head; NULL != n; n = n->next)
{
- tree_mark_peers_disconnected (tree, n, cb);
+ tree_mark_peers_disconnected (tree, n, cb, cbcls);
}
if (MESH_PEER_READY == parent->status)
{
- cb (parent);
+ if (NULL != cb)
+ cb (cbcls, parent->peer);
+ parent->status = MESH_PEER_RECONNECTING;
}
- parent->status = MESH_PEER_RECONNECTING;
/* Remove and free info about first hop */
- GNUNET_PEER_resolve(parent->peer, &id);
- pi = GNUNET_CONTAINER_multihashmap_get(tree->first_hops, &id.hashPubKey);
- GNUNET_CONTAINER_multihashmap_remove_all(tree->first_hops, &id.hashPubKey);
+ GNUNET_PEER_resolve (parent->peer, &id);
+ pi = GNUNET_CONTAINER_multihashmap_get (tree->first_hops, &id.hashPubKey);
+ GNUNET_CONTAINER_multihashmap_remove_all (tree->first_hops, &id.hashPubKey);
if (NULL != pi)
- GNUNET_free(pi);
+ GNUNET_free (pi);
}
/**
- * Recusively update the info about what is the first hop to reach the node
+ * Iterate over all children of the local node.
*
- * @param tree Tree this nodes belongs to
- * @param parent Node to be start updating
- * @param hop If known, ID of the first hop.
- * If not known, NULL to find out and pass on children.
+ * @param tree Tree to use. Must have "me" set.
+ * @param cb Callback to call over each child.
+ * @param cls Closure.
*/
void
-tree_update_first_hops (struct MeshTunnelTree *tree,
- struct MeshTunnelTreeNode *parent,
- struct GNUNET_PeerIdentity *hop)
+tree_iterate_children (struct MeshTunnelTree *tree, MeshTreeCallback cb,
+ void *cls)
{
- struct GNUNET_PeerIdentity pi;
- struct GNUNET_PeerIdentity *copy;
- struct GNUNET_PeerIdentity id;
struct MeshTunnelTreeNode *n;
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
- "tree: Finding first hop for %u.\n",
- parent->peer);
- if (NULL == hop)
+ if (NULL == tree->me)
{
- struct MeshTunnelTreeNode *aux;
- struct MeshTunnelTreeNode *old;
-
- old = parent;
- aux = old->parent;
- while (aux != tree->me)
- {
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
- "tree: ... its not %u.\n",
- old->peer);
- old = aux;
- aux = aux->parent;
- GNUNET_assert(NULL != aux);
- }
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
- "tree: It's %u!!\n",
- old->peer);
- hop = π
- GNUNET_PEER_resolve(old->peer, hop);
+ GNUNET_break (0);
+ return;
}
- copy = GNUNET_malloc(sizeof(struct GNUNET_PeerIdentity));
- *copy = *hop;
- GNUNET_PEER_resolve(parent->peer, &id);
- GNUNET_CONTAINER_multihashmap_put(tree->first_hops, &id.hashPubKey, copy,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
-
- for (n = parent->children_head; NULL != n; n = n->next)
+ for (n = tree->me->children_head; NULL != n; n = n->next)
{
- tree_update_first_hops (tree, n, hop);
+ cb (cls, n->peer);
}
}
+/**
+ * Recusively update the info about what is the first hop to reach the node
+ *
+ * @param tree Tree this nodes belongs to.
+ * @param parent_id Short ID from node form which to start updating.
+ * @param hop If known, ID of the first hop.
+ * If not known, NULL to find out and pass on children.
+ */
+void
+tree_update_first_hops (struct MeshTunnelTree *tree, GNUNET_PEER_Id parent_id,
+ struct GNUNET_PeerIdentity *hop)
+{
+ tree_node_update_first_hops (tree, tree_find_peer (tree, parent_id), hop);
+}
+
+
/**
* Delete the current path to the peer, including all now unused relays.
* The destination peer is NOT destroyed, it is returned in order to either set
* a new path to it or destroy it explicitly, taking care of it's child nodes.
*
* @param t Tunnel tree where to delete the path from.
- * @param peer Destination peer whose path we want to remove.
+ * @param peer_id Short ID of the destination peer whose path we want to remove.
* @param cb Callback to use to notify about disconnected peers.
+ * @param cbcls Closure for cb.
*
* @return pointer to the pathless node.
* NULL when not found
*/
struct MeshTunnelTreeNode *
tree_del_path (struct MeshTunnelTree *t, GNUNET_PEER_Id peer_id,
- MeshNodeDisconnectCB cb)
+ MeshTreeCallback cb, void *cbcls)
{
struct MeshTunnelTreeNode *parent;
struct MeshTunnelTreeNode *node;
struct MeshTunnelTreeNode *n;
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "tree: Deleting path to %u.\n", peer_id);
+#if MESH_TREE_DEBUG
+ struct GNUNET_PeerIdentity id;
+
+ GNUNET_PEER_resolve (peer_id, &id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "tree: Deleting path to %s.\n",
+ GNUNET_i2s (&id));
+#endif
if (peer_id == t->root->peer)
return NULL;
- n = tree_find_peer (t->me, peer_id);
+
+ for (n = t->disconnected_head; NULL != n; n = n->next)
+ {
+ if (n->peer == peer_id)
+ {
+ /* Was already pathless, waiting for reconnection */
+ GNUNET_CONTAINER_DLL_remove (t->disconnected_head, t->disconnected_tail,
+ n);
+ return n;
+ }
+ }
+ n = tree_find_peer (t, peer_id);
if (NULL == n)
return NULL;
node = n;
parent = n->parent;
- GNUNET_CONTAINER_DLL_remove(parent->children_head, parent->children_tail, n);
+ GNUNET_CONTAINER_DLL_remove (parent->children_head, parent->children_tail, n);
n->parent = NULL;
- while (t->root != parent && MESH_PEER_RELAY == parent->status &&
- NULL == parent->children_head)
+ while (MESH_PEER_RELAY == parent->status && NULL == parent->children_head)
{
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
- "tree: Deleting node %u.\n",
- parent->peer);
+#if MESH_TREE_DEBUG
+ GNUNET_PEER_resolve (parent->peer, &id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "tree: Deleting node %s.\n",
+ GNUNET_i2s (&id));
+#endif
n = parent->parent;
- tree_node_destroy(parent);
+ tree_node_destroy (parent);
parent = n;
}
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
- "tree: Not deleted peer %u.\n",
- parent->peer);
+#if MESH_TREE_DEBUG
+ GNUNET_PEER_resolve (parent->peer, &id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "tree: Not deleted peer %s.\n",
+ GNUNET_i2s (&id));
+#endif
- tree_mark_peers_disconnected (t, node, cb);
+ tree_mark_peers_disconnected (t, node, cb, cbcls);
return node;
}
* Return a newly allocated individual path to reach a peer from the local peer,
* according to the path tree of some tunnel.
*
- * @param t Tunnel from which to read the path tree
- * @param peer_info Destination peer to whom we want a path
+ * @param t Tunnel from which to read the path tree.
+ * @param peer Short ID of the destination peer to whom we want a path.
*
* @return A newly allocated individual path to reach the destination peer.
* Path must be destroyed afterwards.
*/
struct MeshPeerPath *
-tree_get_path_to_peer(struct MeshTunnelTree *t, GNUNET_PEER_Id peer)
+tree_get_path_to_peer (struct MeshTunnelTree *t, GNUNET_PEER_Id peer)
{
struct MeshTunnelTreeNode *n;
struct MeshPeerPath *p;
- GNUNET_PEER_Id myid = t->me->peer;
- n = tree_find_peer(t->me, peer);
- p = GNUNET_malloc(sizeof(struct MeshPeerPath));
+ n = tree_find_peer (t, peer);
+ if (NULL == n)
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
+ p = path_new (0);
/* Building the path (inverted!) */
- while (n->peer != myid)
+ while (n->peer != 1)
{
- GNUNET_array_append(p->peers, p->length, n->peer);
- GNUNET_PEER_change_rc(n->peer, 1);
+ GNUNET_array_append (p->peers, p->length, n->peer);
+ GNUNET_PEER_change_rc (n->peer, 1);
n = n->parent;
- GNUNET_assert(NULL != n);
+ if (NULL == n)
+ {
+ GNUNET_break (0);
+ path_destroy (p);
+ return NULL;
+ }
}
- GNUNET_array_append(p->peers, p->length, myid);
- GNUNET_PEER_change_rc(myid, 1);
+ GNUNET_array_append (p->peers, p->length, 1);
+ GNUNET_PEER_change_rc (1, 1);
- path_invert(p);
+ path_invert (p);
return p;
}
+
/**
* Integrate a stand alone path into the tunnel tree.
+ * If the peer toward which the new path is already in the tree, the peer
+ * and its children will be maked as disconnected and the callback
+ * will be called on each one of them. They will be maked as online only after
+ * receiving a PATH ACK for the new path for each one of them, so the caller
+ * should take care of sending a new CREATE PATH message for each disconnected
+ * peer.
*
* @param t Tunnel where to add the new path.
* @param p Path to be integrated.
- * @param cb Callback to use to notify about peers temporarily disconnecting
+ * @param cb Callback to use to notify about peers temporarily disconnecting.
+ * @param cbcls Closure for cb.
*
* @return GNUNET_OK in case of success.
* GNUNET_SYSERR in case of error.
*/
int
tree_add_path (struct MeshTunnelTree *t, const struct MeshPeerPath *p,
- MeshNodeDisconnectCB cb)
+ MeshTreeCallback cb, void *cbcls)
{
struct MeshTunnelTreeNode *parent;
struct MeshTunnelTreeNode *oldnode;
struct MeshTunnelTreeNode *n;
struct MeshTunnelTreeNode *c;
struct GNUNET_PeerIdentity id;
- struct GNUNET_PeerIdentity *hop;
- GNUNET_PEER_Id myid = t->me->peer;
int me;
unsigned int i;
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
- "tree: Adding path [%u] towards peer %u to peer %u.\n",
- p->length,
- p->peers[p->length - 1],
- t->me->peer);
- GNUNET_assert(0 != p->length);
+#if MESH_TREE_DEBUG
+ GNUNET_PEER_resolve (p->peers[p->length - 1], &id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "tree: Adding path [%u] towards peer %s.\n", p->length,
+ GNUNET_i2s (&id));
+#endif
+
+ GNUNET_assert (0 != p->length);
parent = n = t->root;
if (n->peer != p->peers[0])
{
}
if (1 == p->length)
return GNUNET_OK;
- oldnode = tree_del_path (t, p->peers[p->length - 1], cb);
+ oldnode = tree_del_path (t, p->peers[p->length - 1], cb, cbcls);
/* Look for the first node that is not already present in the tree
*
* Assuming that the tree is somewhat balanced, O(log n * log N).
* - Length of the path is expected to be log N (size of whole network).
* - Each level of the tree is expected to have log n children (size of tree).
*/
- me = t->root->peer == myid ? 0 : -1;
+ me = t->root->peer == 1 ? 0 : -1;
for (i = 1; i < p->length; i++)
{
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
- "tree: Looking for peer %u.\n",
- p->peers[i]);
+#if MESH_TREE_DEBUG
+ GNUNET_PEER_resolve (p->peers[i], &id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "tree: Looking for peer %s.\n",
+ GNUNET_i2s (&id));
+#endif
parent = n;
- if (p->peers[i] == myid)
+ if (p->peers[i] == 1)
me = i;
for (c = n->children_head; NULL != c; c = c->next)
{
if (c->peer == p->peers[i])
{
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
- "tree: Found in children of %u.\n",
- parent->peer);
+#if MESH_TREE_DEBUG
+ GNUNET_PEER_resolve (parent->peer, &id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "tree: Found in children of %s.\n", GNUNET_i2s (&id));
+#endif
n = c;
break;
}
if (parent == n)
break;
}
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
- "tree: All childen visited.\n");
- if (-1 == me)
- {
- /* New path deviates from tree before reaching us. What happened? */
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
+#if MESH_TREE_DEBUG
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "tree: All childen visited.\n");
+#endif
/* Add the rest of the path as a branch from parent. */
while (i < p->length)
{
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
- "tree: Adding peer %u, to %u.\n",
- p->peers[i],
- parent->peer);
+#if MESH_TREE_DEBUG
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "tree: Adding peer %u to %u.\n",
+ p->peers[i], parent->peer);
+ GNUNET_PEER_resolve (p->peers[i], &id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "tree: Adding peer %s.\n",
+ GNUNET_i2s (&id));
+ GNUNET_PEER_resolve (parent->peer, &id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "tree: to %s.\n",
+ GNUNET_i2s (&id));
+#endif
if (i == p->length - 1 && NULL != oldnode)
{
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "tree: Putting old node into place.\n");
+#if MESH_TREE_DEBUG
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "tree: Putting old node into place.\n");
+#endif
oldnode->parent = parent;
- GNUNET_CONTAINER_DLL_insert(parent->children_head,
- parent->children_tail,
- oldnode);
- tree_update_first_hops (t, oldnode, NULL);
+ GNUNET_CONTAINER_DLL_insert (parent->children_head, parent->children_tail,
+ oldnode);
+ tree_node_update_first_hops (t, oldnode, NULL);
n = oldnode;
}
else
{
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "tree: Creating new node.\n");
- n = tree_node_new(parent, p->peers[i]);
- n->t = t->t;
+#if MESH_TREE_DEBUG
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "tree: Creating new node.\n");
+#endif
+ n = tree_node_new (parent, p->peers[i]);
n->status = MESH_PEER_RELAY;
+ if (n->peer == 1)
+ {
+ t->me = n;
+ me = i;
+ }
}
i++;
parent = n;
}
n->status = MESH_PEER_SEARCHING;
+ GNUNET_break (-1 != me);
+
/* Add info about first hop into hashmap. */
- if (me < p->length - 1)
+ if (-1 != me && me < p->length - 1)
{
- GNUNET_PEER_resolve (p->peers[p->length - 1], &id);
- hop = GNUNET_CONTAINER_multihashmap_get(t->first_hops, &id.hashPubKey);
- if (NULL != hop)
- {
- GNUNET_CONTAINER_multihashmap_remove_all(t->first_hops, &id.hashPubKey);
- GNUNET_free(hop);
- }
- hop = GNUNET_malloc(sizeof(struct GNUNET_PeerIdentity));
- GNUNET_PEER_resolve (p->peers[me + 1], hop);
- GNUNET_CONTAINER_multihashmap_put (t->first_hops, &id.hashPubKey,
- hop,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
+#if MESH_TREE_DEBUG
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "MESH: finding first hop (own pos %d/%u)\n", me,
+ p->length - 1);
+#endif
+ GNUNET_PEER_resolve (p->peers[me + 1], &id);
+ tree_update_first_hops (t, p->peers[me + 1], &id);
+ }
+#if MESH_TREE_DEBUG
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "MESH: was last in path, not updating first hops (%d/%u)\n",
+ me, p->length - 1);
}
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "tree: New node added.\n");
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "tree: New node added.\n");
+#endif
+ if (NULL == t->me)
+ t->me = tree_find_peer (t, 1);
return GNUNET_OK;
}
/**
- * Allocates and initializes a new node.
- * Sets ID and parent of the new node and inserts it in the DLL of the parent
+ * Notifies a tree that a connection it might be using is broken.
+ * Marks all peers down the paths as disconnected and notifies the client.
*
- * @param parent Node that will be the parent from the new node, NULL for root
- * @param id Short Id of the new node
+ * @param t Tree to use.
+ * @param p1 Short id of one of the peers (order unimportant)
+ * @param p2 Short id of one of the peers (order unimportant)
+ * @param cb Function to call for every peer that is marked as disconnected.
+ * @param cbcls Closure for cb.
*
- * @return Newly allocated node
+ * @return Short ID of the first disconnected peer in the tree.
*/
-struct MeshTunnelTreeNode *
-tree_node_new(struct MeshTunnelTreeNode *parent, GNUNET_PEER_Id id)
+GNUNET_PEER_Id
+tree_notify_connection_broken (struct MeshTunnelTree *t, GNUNET_PEER_Id p1,
+ GNUNET_PEER_Id p2, MeshTreeCallback cb,
+ void *cbcls)
{
- struct MeshTunnelTreeNode *node;
+ struct MeshTunnelTreeNode *n;
+ struct MeshTunnelTreeNode *c;
- node = GNUNET_malloc(sizeof(struct MeshTunnelTreeNode));
- node->peer = id;
- GNUNET_PEER_change_rc(id, 1);
- node->parent = parent;
- if (NULL != parent)
- GNUNET_CONTAINER_DLL_insert(parent->children_head,
- parent->children_tail,
- node);
+ n = tree_find_peer (t, p1);
+ if (NULL == n)
+ return 0;
+ if (NULL != n->parent && n->parent->peer == p2)
+ {
+ tree_mark_peers_disconnected (t, n, cb, cbcls);
+ GNUNET_CONTAINER_DLL_remove (n->parent->children_head,
+ n->parent->children_tail, n);
+ GNUNET_CONTAINER_DLL_insert (t->disconnected_head, t->disconnected_tail, n);
+ return p1;
+ }
+ for (c = n->children_head; NULL != c; c = c->next)
+ {
+ if (c->peer == p2)
+ {
+ tree_mark_peers_disconnected (t, c, cb, cbcls);
+ GNUNET_CONTAINER_DLL_remove (n->children_head, n->children_tail, c);
+ GNUNET_CONTAINER_DLL_insert (t->disconnected_head, t->disconnected_tail,
+ c);
+ return p2;
+ }
+ }
+ return 0;
+}
- return node;
+
+/**
+ * Deletes a peer from a tunnel, liberating all unused resources on the path to
+ * it. It shouldn't have children, if it has they will be destroyed as well.
+ * If the tree is not local and no longer has any paths, the root node will be
+ * destroyed and marked as NULL.
+ *
+ * @param t Tunnel tree to use.
+ * @param peer Short ID of the peer to remove from the tunnel tree.
+ * @param cb Callback to notify client of disconnected peers.
+ * @param cbcls Closure for cb.
+ *
+ * @return GNUNET_OK or GNUNET_SYSERR
+ */
+int
+tree_del_peer (struct MeshTunnelTree *t, GNUNET_PEER_Id peer,
+ MeshTreeCallback cb, void *cbcls)
+{
+ struct MeshTunnelTreeNode *n;
+
+ n = tree_del_path (t, peer, cb, cbcls);
+ if (NULL == n)
+ {
+ GNUNET_break (0);
+ return GNUNET_YES;
+ }
+ GNUNET_break_op (NULL == n->children_head);
+ tree_node_destroy (n);
+ if (NULL == t->root->children_head && t->me != t->root)
+ {
+ tree_node_destroy (t->root);
+ t->root = NULL;
+ return GNUNET_NO;
+ }
+ return GNUNET_YES;
}
+
/**
- * Destroys and frees the node and all children
- *
- * @param n Parent node to be destroyed
+ * Get the cost of the path relative to the already built tunnel tree.
+ *
+ * @param t The tunnel tree to which compare.
+ * @param path The individual path to reach a peer. It has to start at the
+ * root of the tree to be comparable.
+ *
+ * @return Number of hops to reach destination, UINT_MAX in case the peer is not
+ * in the path.
+ *
+ * TODO: adapt to allow any start / root combination
+ * TODO: take in account state of the nodes
*/
-void
-tree_node_destroy (struct MeshTunnelTreeNode *parent)
+unsigned int
+tree_get_path_cost (struct MeshTunnelTree *t, struct MeshPeerPath *path)
{
struct MeshTunnelTreeNode *n;
- struct MeshTunnelTreeNode *next;
+ struct MeshTunnelTreeNode *p;
+ unsigned int i;
+ unsigned int l;
- n = parent->children_head;
- while (NULL != n)
+ l = path_get_length (path);
+ p = t->root;
+ if (t->root->peer != path->peers[0])
{
- next = n->next;
- tree_node_destroy(n);
- n = next;
+ GNUNET_break (0);
+ return UINT_MAX;
}
- GNUNET_PEER_change_rc(parent->peer, -1);
- if (NULL != parent->parent)
- GNUNET_CONTAINER_DLL_remove(parent->parent->children_head,
- parent->parent->children_tail,
- parent);
- GNUNET_free(parent);
+ for (i = 1; i < l; i++)
+ {
+ for (n = p->children_head; NULL != n; n = n->next)
+ {
+ if (path->peers[i] == n->peer)
+ {
+ break;
+ }
+ }
+ if (NULL == n)
+ return l - i;
+ p = n;
+ }
+ return l - i;
+}
+
+
+/**
+ * Print the tree on stderr
+ *
+ * @param t The tree
+ */
+void
+tree_debug (struct MeshTunnelTree *t)
+{
+ tree_node_debug (t->root, 0);
}
static int
iterate_free (void *cls, const GNUNET_HashCode * key, void *value)
{
- GNUNET_free(value);
+ GNUNET_free (value);
return GNUNET_YES;
}
/**
* Destroy the whole tree and free all used memory and Peer_Ids
- *
+ *
* @param t Tree to be destroyed
*/
void
tree_destroy (struct MeshTunnelTree *t)
{
- tree_node_destroy(t->root);
- GNUNET_CONTAINER_multihashmap_iterate(t->first_hops, &iterate_free, NULL);
- GNUNET_CONTAINER_multihashmap_destroy(t->first_hops);
- GNUNET_free(t);
-}
\ No newline at end of file
+#if MESH_TREE_DEBUG
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "tree: Destroying tree\n");
+#endif
+ tree_node_destroy (t->root);
+ GNUNET_CONTAINER_multihashmap_iterate (t->first_hops, &iterate_free, NULL);
+ GNUNET_CONTAINER_multihashmap_destroy (t->first_hops);
+ GNUNET_free (t);
+}
projects / oweals / gnunet.git / blobdiff