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/* Find public key in DNS
* Copyright (C) 2000-2002 D. Hugh Redelmeier.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include <utils/identification.h>
extern int adns_qfd; /* file descriptor for sending queries to adns */
extern int adns_afd; /* file descriptor for receiving answers from adns */
extern const char *pluto_adns_option; /* path from --pluto_adns */
extern void init_adns(void);
extern void stop_adns(void);
extern void handle_adns_answer(void);
extern bool unsent_ADNS_queries;
extern void send_unsent_ADNS_queries(void);
/* (common prefix of) stuff remembered between async query and answer.
* Filled in by start_adns_query.
* Freed by call to release_adns_continuation.
*/
struct adns_continuation; /* forward declaration (not far!) */
typedef void (*cont_fn_t)(struct adns_continuation *cr, err_t ugh);
struct adns_continuation {
unsigned long qtid; /* query transaction id number */
int type; /* T_TXT or T_KEY, selecting rr type of interest */
cont_fn_t cont_fn; /* function to carry on suspended work */
identification_t *id; /* subject of query */
bool sgw_specified;
identification_t *sgw_id; /* peer, if constrained */
lset_t debugging; /* only used #ifdef DEBUG, but don't want layout to change */
struct gw_info *gateways_from_dns; /* answer, if looking for our TXT rrs */
#ifdef USE_KEYRR
struct pubkey_list *keys_from_dns; /* answer, if looking for KEY rrs */
#endif
struct adns_continuation *previous, *next;
struct pubkey *last_info; /* the last structure we accumulated */
#ifdef USE_LWRES
bool used; /* have we called the cont_fn yet? */
struct {
u_char name_buf[NS_MAXDNAME + 2];
} query;
#else /* ! USE_LWRES */
struct adns_query query;
#endif /* ! USE_LWRES */
};
extern err_t start_adns_query(identification_t *id /* domain to query */
, identification_t *sgw_id /* if non-null, any accepted gw_info must match */
, int type /* T_TXT or T_KEY, selecting rr type of interest */
, cont_fn_t cont_fn /* continuation function */
, struct adns_continuation *cr);
/* Gateway info gleaned from reverse DNS of client */
struct gw_info {
unsigned refcnt; /* reference counted! */
unsigned pref; /* preference: lower is better */
#define NO_TIME ((time_t) -2) /* time_t value meaning "not_yet" */
identification_t* client_id; /* id of client of peer */
identification_t* gw_id; /* id of peer (if id_is_ipaddr, .ip_addr is address) */
bool gw_key_present;
struct pubkey *key;
struct gw_info *next;
};
extern void gw_addref(struct gw_info *gw);
extern void gw_delref(struct gw_info **gwp);
extern void reset_adns_restart_count(void);
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