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Implement circuitmux_attached_circuit_direction(), circuitmux_find_map_entry() and circuitmux_is_circuit_attached() in circuitmux.c

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This commit is contained in:
Andrea Shepard 2012-09-26 10:54:08 -07:00
parent 3c41d7f414
commit 7e5c358d38
1 changed files with 97 additions and 0 deletions
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97
src/or/circuitmux.c
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@ -137,6 +137,8 @@ chanid_circid_entries_eq(chanid_circid_muxinfo_t *a,
chanid_circid_muxinfo_t *b);
static INLINE unsigned int
chanid_circid_entry_hash(chanid_circid_muxinfo_t *a);
static chanid_circid_muxinfo_t *
circuitmux_find_map_entry(circuitmux_t *cmux, circuit_t *circ);
/* Function definitions */
@ -441,3 +443,98 @@ circuitmux_attach_circuit(circuitmux_t *cmux, circuit_t *circ,
}
}
/*
* Circuitmux/circuit attachment status inquiry functions
*/
/**
* Query the direction of an attached circuit
*/
cell_direction_t
circuitmux_attached_circuit_direction(circuitmux_t *cmux, circuit_t *circ)
{
chanid_circid_muxinfo_t *hashent = NULL;
/* Try to find a map entry */
hashent = circuitmux_find_map_entry(cmux, circ);
/*
* This function should only be called on attached circuits; assert that
* we had a map entry.
*/
tor_assert(hashent);
/* Return the direction from the map entry */
return hashent->muxinfo.direction;
}
/**
* Find an entry in the cmux's map for this circuit or return NULL if there
* is none.
*/
static chanid_circid_muxinfo_t *
circuitmux_find_map_entry(circuitmux_t *cmux, circuit_t *circ)
{
chanid_circid_muxinfo_t search, *hashent = NULL;
/* Sanity-check parameters */
tor_assert(cmux);
tor_assert(cmux->chanid_circid_map);
tor_assert(circ);
tor_assert(circ->n_chan);
/* Okay, let's see if it's attached for n_chan/n_circ_id */
search.chan_id = circ->n_chan->global_identifier;
search.circ_id = circ->n_circ_id;
/* Query */
hashent = HT_FIND(chanid_circid_muxinfo_map, cmux->chanid_circid_map,
&search);
/* Found something? */
if (hashent) {
/*
* Assert that the direction makes sense for a hashent we found by
* n_chan/n_circ_id before we return it.
*/
tor_assert(hashent->muxinfo.direction == CELL_DIRECTION_OUT);
} else {
/* Not there, have we got a p_chan/p_circ_id to try? */
if (circ->magic == OR_CIRCUIT_MAGIC) {
search.circ_id = TO_OR_CIRCUIT(circ)->p_circ_id;
/* Check for p_chan */
if (TO_OR_CIRCUIT(circ)->p_chan) {
search.chan_id = TO_OR_CIRCUIT(circ)->p_chan->global_identifier;
/* Okay, search for that */
hashent = HT_FIND(chanid_circid_muxinfo_map, cmux->chanid_circid_map,
&search);
/* Find anything? */
if (hashent) {
/* Assert that the direction makes sense before we return it */
tor_assert(hashent->muxinfo.direction == CELL_DIRECTION_IN);
}
}
}
}
/* Okay, hashent is it if it was there */
return hashent;
}
/**
* Query whether a circuit is attached to a circuitmux
*/
int
circuitmux_is_circuit_attached(circuitmux_t *cmux, circuit_t *circ)
{
chanid_circid_muxinfo_t *hashent = NULL;
/* Look if it's in the circuit map */
hashent = circuitmux_find_map_entry(cmux, circ);
return (hashent != NULL);
}