Commit 8a05e1a5 authored by David Goulet's avatar David Goulet 🐼
Browse files

circuit: Add a function to get the next service intro circuit 



Signed-off-by: David Goulet's avatarDavid Goulet <dgoulet@torproject.org>
parent df87812b

src/or/circuitlist.c

+35 −0
Original line number Diff line number Diff line
@@ -1440,6 +1440,41 @@ circuit_get_ready_rend_circ_by_rend_data(const rend_data_t *rend_data) 
  return NULL;

}



/** Return the first service introduction circuit originating from the global

 * circuit list after <b>start</b> or at the start of the list if <b>start</b>

 * is NULL. Return NULL if no circuit is found.

 *

 * A service introduction point circuit has a purpose of either

 * CIRCUIT_PURPOSE_S_ESTABLISH_INTRO or CIRCUIT_PURPOSE_S_INTRO. This does not

 * return a circuit marked for close and its state must be open. */

origin_circuit_t *

circuit_get_next_service_intro_circ(origin_circuit_t *start)

{

  int idx = 0;

  smartlist_t *lst = circuit_get_global_list();



  if (start) {

    idx = TO_CIRCUIT(start)->global_circuitlist_idx + 1;

  }



  for ( ; idx < smartlist_len(lst); ++idx) {

    circuit_t *circ = smartlist_get(lst, idx);



    /* Ignore a marked for close circuit or purpose not matching a service

     * intro point or if the state is not open. */

    if (circ->marked_for_close || circ->state != CIRCUIT_STATE_OPEN ||

        (circ->purpose != CIRCUIT_PURPOSE_S_ESTABLISH_INTRO &&

         circ->purpose != CIRCUIT_PURPOSE_S_INTRO)) {

      continue;

    }

    /* The purposes we are looking for are only for origin circuits so the

     * following is valid. */

    return TO_ORIGIN_CIRCUIT(circ);

  }

  /* Not found. */

  return NULL;

}



/** Return the first circuit originating here in global_circuitlist after

 * <b>start</b> whose purpose is <b>purpose</b>, and where <b>digest</b> (if

 * set) matches the private key digest of the rend data associated with the

src/or/circuitlist.h

+1 −0
Original line number Diff line number Diff line
@@ -47,6 +47,7 @@ origin_circuit_t *circuit_get_ready_rend_circ_by_rend_data( 
  const rend_data_t *rend_data);

origin_circuit_t *circuit_get_next_by_pk_and_purpose(origin_circuit_t *start,

                                     const uint8_t *digest, uint8_t purpose);

origin_circuit_t *circuit_get_next_service_intro_circ(origin_circuit_t *start);

origin_circuit_t *circuit_find_to_cannibalize(uint8_t purpose,

                                              extend_info_t *info, int flags);

void circuit_mark_all_unused_circs(void);