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/* This file is part of Mailfromd.
Copyright (C) 2005-2024 Sergey Poznyakoff
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 3, or (at your option)
any later version.
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.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef __mfd_dns_h
#define __mfd_dns_h
#include <mflib/status.h>
#define NELEMS(a) (sizeof(a) / sizeof((a)[0]))
/* NOTICE: When updating this enum, be sure to update dns_to_mf_status in
dns.c accordingly. */
typedef enum {
dns_success,
dns_not_found,
dns_failure,
dns_temp_failure,
dns_too_many
} dns_status;
typedef enum {
dns_reply_ip,
dns_reply_ip6,
dns_reply_str
} dns_reply_type;
struct dns_reply {
dns_reply_type type;
int count;
size_t maxcount;
union {
char **str;
struct in_addr *ip;
struct in6_addr *ip6;
void *ptr;
} data;
};
/*
* Resolve modes for ns and mx lookups. The DFL mode (use connection
* type) is handled by MFL built-ins.
*/
enum {
resolve_none = _MFL_RESOLVE_NONE, /* Don't resolve hostnames. */
resolve_ip4 = _MFL_RESOLVE_IP4, /* Look up A records. */
resolve_ip6 = _MFL_RESOLVE_IP6 /* Look up AAAA records. */
};
#define IPV4_INADDR_DOMAIN "in-addr.arpa"
/*
* Max. buffer capacity for reversed dotted-quad IPv4: four three-digit
* segments, each terminated by a dot, plus 1 byte for terminating \0.
*/
#define IPV4_DOTTED_BUFSIZE (4*4 + 1)
/*
* Max. buffer capacity for formatting an in-addr.arpa address.
*/
#define IPV4_INADDR_BUFSIZE \
(IPV4_DOTTED_BUFSIZE + sizeof(IPV4_INADDR_DOMAIN) - 1)
#define IPV6_INADDR_DOMAIN "ip6.arpa"
/*
* Max. buffer capacity for IPv6 addresses: 32 hexdigit
* segments, each terminated by a dot, plus 1 byte for terminating \0.
*/
#define IPV6_DOTTED_BUFSIZE (32*2 + 1)
/*
* Max. buffer capacity for formatting an ip6.arpa address.
*/
#define IPV6_INADDR_BUFSIZE \
(IPV6_DOTTED_BUFSIZE + sizeof(IPV6_INADDR_DOMAIN) - 1)
#define IPMAX_DOTTED_BUFSIZE IPV6_DOTTED_BUFSIZE
#define IPMAX_INADDR_BUFSIZE IPV6_INADDR_BUFSIZE
void dnsbase_real_init(char *configtext);
void dnsbase_file_init(char const *file);
void dns_reply_init(struct dns_reply *reply, dns_reply_type type, size_t count);
void dns_reply_free(struct dns_reply *r);
size_t dns_reply_elsize(struct dns_reply *reply);
int dns_str_is_ipv4(const char *addr);
int dns_str_is_ipv6(const char *addr);
int dns_reverse_ipstr(const char *ipstr, char *revipstr, size_t len);
dns_status dns_reverse_name(const char *ipstr, char *buf, size_t bufsize);
dns_status dns_resolve_ipstr(const char *ipstr, struct dns_reply *reply);
dns_status dns_resolve_hostname(const char *host, int resolve_family, char **ipbuf);
dns_status soa_check(const char *name, int ip, struct dns_reply *repl);
dns_status a_lookup(const char *host, struct dns_reply *repl);
dns_status aaaa_lookup(const char *host, struct dns_reply *repl);
dns_status ptr_lookup(const char *host, struct dns_reply *reply);
dns_status txt_lookup(const char *name, struct dns_reply *repl);
dns_status ptr_validate(const char *ipstr, struct dns_reply *repl);
dns_status spf_lookup(const char *domain, char **record);
dns_status dkim_lookup(const char *domain, const char *sel, char ***retval);
dns_status mx_lookup(const char *host, int resolve, struct dns_reply *repl);
dns_status ns_lookup(const char *host, int resolve, struct dns_reply *reply);
#endif
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