mirror of git://git.gnupg.org/gnupg.git
170 lines
5.6 KiB
C
170 lines
5.6 KiB
C
/* dns-stuff.c - DNS related code including CERT RR (rfc-4398)
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* Copyright (C) 2006 Free Software Foundation, Inc.
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* Copyright (C) 2006, 2015 Werner Koch
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*
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* This file is part of GnuPG.
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of either
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*
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* - the GNU Lesser General Public License as published by the Free
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* Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* or
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*
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* - the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* or both in parallel, as here.
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*
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* This file is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef GNUPG_DIRMNGR_DNS_STUFF_H
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#define GNUPG_DIRMNGR_DNS_STUFF_H
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#ifdef HAVE_W32_SYSTEM
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# ifdef HAVE_WINSOCK2_H
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# include <winsock2.h>
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# endif
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# include <windows.h>
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#else
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# include <sys/types.h>
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# include <sys/socket.h>
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#endif
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/*
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* Flags used with resolve_dns_addr.
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*/
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#define DNS_NUMERICHOST 1 /* Force numeric output format. */
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#define DNS_WITHBRACKET 2 /* Put brackets around numeric v6
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addresses. */
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/*
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* Constants for use with get_dns_cert.
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*/
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#define DNS_CERTTYPE_ANY 0 /* Internal catch all type. */
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/* Certificate types according to RFC-4398: */
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#define DNS_CERTTYPE_PKIX 1 /* X.509 as per PKIX. */
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#define DNS_CERTTYPE_SPKI 2 /* SPKI certificate. */
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#define DNS_CERTTYPE_PGP 3 /* OpenPGP packet. */
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#define DNS_CERTTYPE_IPKIX 4 /* The URL of an X.509 data object. */
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#define DNS_CERTTYPE_ISPKI 5 /* The URL of an SPKI certificate. */
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#define DNS_CERTTYPE_IPGP 6 /* The fingerprint
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and URL of an OpenPGP packet. */
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#define DNS_CERTTYPE_ACPKIX 7 /* Attribute Certificate. */
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#define DNS_CERTTYPE_IACPKIX 8 /* The URL of an Attribute Certificate. */
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#define DNS_CERTTYPE_URI 253 /* URI private. */
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#define DNS_CERTTYPE_OID 254 /* OID private. */
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/* Hacks for our implementation. */
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#define DNS_CERTTYPE_RRBASE 1024 /* Base of special constants. */
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#define DNS_CERTTYPE_RR61 (DNS_CERTTYPE_RRBASE + 61)
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struct dns_addrinfo_s;
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typedef struct dns_addrinfo_s *dns_addrinfo_t;
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struct dns_addrinfo_s
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{
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dns_addrinfo_t next;
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int family;
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int socktype;
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int protocol;
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int addrlen;
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struct sockaddr_storage addr[1];
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};
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struct srventry
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{
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unsigned short priority;
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unsigned short weight;
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unsigned short port;
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int run_count;
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char target[1025];
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};
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/* Set verbosity and debug mode for this module. */
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void set_dns_verbose (int verbose, int debug);
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/* Set the Disable-IPv4 flag so that the name resolver does not return
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* A addresses. */
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void set_dns_disable_ipv4 (int yes);
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/* Set the Disable-IPv6 flag so that the name resolver does not return
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* AAAA addresses. */
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void set_dns_disable_ipv6 (int yes);
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/* Set the timeout for libdns requests to SECONDS. */
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void set_dns_timeout (int seconds);
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/* Calling this function with YES set to True forces the use of the
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* standard resolver even if dirmngr has been built with support for
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* an alternative resolver. */
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void enable_standard_resolver (int yes);
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/* Return true if the standard resolver is used. */
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int standard_resolver_p (void);
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/* Calling this function with YES switches libdns into recursive mode.
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* It has no effect on the standard resolver. */
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void enable_recursive_resolver (int yes);
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/* Return true iff the recursive resolver is used. */
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int recursive_resolver_p (void);
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/* Put this module eternally into Tor mode. When called agained with
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* NEW_CIRCUIT request a new TOR circuit for the next DNS query. */
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void enable_dns_tormode (int new_circuit);
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void disable_dns_tormode (void);
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/* Change the default IP address of the nameserver to IPADDR. The
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address needs to be a numerical IP address and will be used for the
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next DNS query. Note that this is only used in Tor mode. */
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void set_dns_nameserver (const char *ipaddr);
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/* SIGHUP action handler for this module. */
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void reload_dns_stuff (int force);
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void free_dns_addrinfo (dns_addrinfo_t ai);
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/* Function similar to getaddrinfo. */
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gpg_error_t resolve_dns_name (const char *name, unsigned short port,
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int want_family, int want_socktype,
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dns_addrinfo_t *r_dai, char **r_canonname);
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/* Function similar to getnameinfo. */
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gpg_error_t resolve_dns_addr (const struct sockaddr_storage *addr, int addrlen,
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unsigned int flags, char **r_name);
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/* Return true if NAME is a numerical IP address. */
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int is_ip_address (const char *name);
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/* Return true if NAME is an onion address. */
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int is_onion_address (const char *name);
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/* Get the canonical name for NAME. */
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gpg_error_t get_dns_cname (const char *name, char **r_cname);
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/* Return a CERT record or an arbitrary RR. */
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gpg_error_t get_dns_cert (const char *name, int want_certtype,
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void **r_key, size_t *r_keylen,
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unsigned char **r_fpr, size_t *r_fprlen,
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char **r_url);
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/* Return an array of SRV records. */
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gpg_error_t get_dns_srv (const char *name,
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const char *service, const char *proto,
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struct srventry **list, unsigned int *r_count);
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#endif /*GNUPG_DIRMNGR_DNS_STUFF_H*/
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