-
/*
This file is part of GNUnet.
Copyright (C) 2001-2017 GNUnet e.V.
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
-
/**
* @file cadet/gnunet-service-cadet-new_paths.c
* @brief Information we track per path.
#include "gnunet-service-cadet-new_paths.h"
+#define LOG(level, ...) GNUNET_log_from(level,"cadet-pat",__VA_ARGS__)
+
+
/**
* Information regarding a possible path to reach a peer.
*/
entry = &path->entries[path->entries_length - 1];
path->hn = GCP_attach_path (entry->peer,
path,
- path->entries_length);
+ path->entries_length,
+ GNUNET_NO);
if (NULL != path->hn)
return; /* yep, got attached, we are done. */
}
* @param path path to extend
* @param peers list of peers beyond the end of @a path
* @param num_peers length of the @a peers array
+ * @param force force attachment, even if we have other
+ * paths already
*/
static void
extend_path (struct CadetPeerPath *path,
struct CadetPeer **peers,
- unsigned int num_peers)
+ unsigned int num_peers,
+ int force)
{
unsigned int old_len = path->entries_length;
struct GNUNET_CONTAINER_HeapNode *hn;
/* FIXME: note that path->desirability is used, but not yet updated here! */
hn = GCP_attach_path (peers[i],
path,
- old_len + (unsigned int) i);
+ old_len + (unsigned int) i,
+ GNUNET_YES);
if (NULL != hn)
break;
}
const struct GNUNET_PeerIdentity *put_path,
unsigned int put_path_length)
{
- struct CheckMatchContext cm_ctx;
struct CadetPeer *cpath[get_path_length + put_path_length];
+ struct CheckMatchContext cm_ctx;
struct CadetPeerPath *path;
struct GNUNET_CONTAINER_HeapNode *hn;
int i;
/* Existing path ends in the middle of new path, extend it! */
extend_path (cm_ctx.match,
&cpath[i],
- get_path_length + put_path_length - i);
+ get_path_length + put_path_length - i,
+ GNUNET_NO);
return;
}
}
/* FIXME: note that path->desirability is used, but not yet initialized here! */
hn = GCP_attach_path (cpath[i],
path,
- (unsigned int) i);
+ (unsigned int) i,
+ GNUNET_NO);
if (NULL != hn)
break;
}
* We got an incoming connection, obtain the corresponding path.
*
* @param path_length number of segments on the @a path
- * @param path through the network, in reverse order (we are at the end!)
+ * @param pids path through the network, in reverse order (we are at the end at index @a path_length)
* @return corresponding path object
*/
struct CadetPeerPath *
GCPP_get_path_from_route (unsigned int path_length,
const struct GNUNET_PeerIdentity *pids)
{
- GNUNET_assert (0); // FIXME!
- return NULL;
+ struct CheckMatchContext cm_ctx;
+ struct CadetPeer *cpath[path_length];
+ struct CadetPeerPath *path;
+
+ /* precompute inverted 'cpath' so we can avoid doing the lookups and
+ have the correct order */
+ for (unsigned int off=0;off<path_length;off++)
+ cpath[off] = GCP_get (&pids[path_length - 1 - off],
+ GNUNET_YES);
+
+ /* First figure out if this path is a subset of an existing path, an
+ extension of an existing path, or a new path. */
+ cm_ctx.cpath = cpath;
+ cm_ctx.match = NULL;
+ for (int i=path_length-1;i>=0;i--)
+ {
+ GCP_iterate_paths_at (cpath[i],
+ (unsigned int) i,
+ &check_match,
+ &cm_ctx);
+ if (NULL != cm_ctx.match)
+ {
+ if (i == path_length - 1)
+ {
+ /* Existing path includes this one, return the match! */
+ return cm_ctx.match;
+ }
+ if (cm_ctx.match->entries_length == i + 1)
+ {
+ /* Existing path ends in the middle of new path, extend it! */
+ extend_path (cm_ctx.match,
+ &cpath[i],
+ path_length - i,
+ GNUNET_YES);
+ /* Check that extension was successful */
+ GNUNET_assert (cm_ctx.match->entries_length == path_length);
+ return cm_ctx.match;
+ }
+ }
+ }
+
+ /* No match at all, create completely new path */
+ path = GNUNET_new (struct CadetPeerPath);
+ path->entries_length = path_length;
+ path->entries = GNUNET_new_array (path->entries_length,
+ struct CadetPeerPathEntry);
+ for (int i=path_length-1;i>=0;i--)
+ {
+ struct CadetPeerPathEntry *entry = &path->entries[i];
+
+ entry->peer = cpath[i];
+ entry->path = path;
+ GCP_path_entry_add (entry->peer,
+ entry,
+ i);
+ }
+ path->hn = GCP_attach_path (cpath[path_length - 1],
+ path,
+ path_length - 1,
+ GNUNET_YES);
+ return path;
}
}
+/**
+ * Convert a path to a human-readable string.
+ *
+ * @param path path to convert
+ * @return string, to be freed by caller (unlike other *_2s APIs!)
+ */
+char *
+GCPP_2s (struct CadetPeerPath *path)
+{
+ char *s;
+ char *old;
+
+ old = GNUNET_strdup ("");
+ for (unsigned int i = 0;
+ i < path->entries_length;
+ i++)
+ {
+ GNUNET_asprintf (&s,
+ "%s %s",
+ old,
+ GCP_2s (GCPP_get_peer_at_offset (path,
+ i)));
+ GNUNET_free_non_null (old);
+ old = s;
+ }
+ return old;
+}
+
+
/* end of gnunet-service-cadet-new_paths.c */
projects / oweals / gnunet.git / blobdiff