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