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/* This file is part of Mailfromd.
Copyright (C) 2005-2008, 2010-2011, 2015-2017 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
typedef enum {
dns_success,
dns_not_found,
dns_failure,
dns_temp_failure,
} dns_status;
#define NELEMS(c) (sizeof(c)/sizeof((c)[0]))
/* Libresolv-related defines and DNS functions */
#ifndef MAXPACKET
# define MAXPACKET 8192 /* max packet size used internally by BIND */
#endif
#define MXF_REUSE 0x02
struct mxbuf {
int mx_flags;
size_t mx_max;
char **mx_buf;
size_t mx_cnt;
};
#define MAXCNAMEDEPTH 24 /* FIXME */
#ifdef HAVE_PTHREAD
# define MUTEX_DCL(name) \
static pthread_mutex_t name = PTHREAD_MUTEX_INITIALIZER;
# define MUTEX_LOCK(name) \
pthread_mutex_lock(&name)
# define MUTEX_UNLOCK(name) \
pthread_mutex_unlock(&name);
#else
# define MUTEX_DCL(name)
# define MUTEX_LOCK(name)
# define MUTEX_UNLOCK(name)
#endif
#if !defined res_ninit && !defined HAVE_RES_NINIT
# define res_ninit(s)
#endif
#if !defined res_nclose && !defined HAVE_RES_NCLOSE
# define res_nclose(s)
#endif
#if !defined res_nquery && !defined HAVE_RES_NQUERY
# define res_nquery(stat,name,class,type,answer,anslen) \
res_query(name,class,type,answer,anslen)
#endif
#if !defined res_nquerydomain && !defined HAVE_RES_NQUERYDOMAIN
# define res_nquerydomain(stat,name,domain,class,type,answer,anslen) \
res_querydomain(name,domain,class,type,answer,anslen)
#endif
#define UPDATE_TTL(m, ttl) do { if ((m) > (ttl)) (m) = (ttl); } while(0)
void mxbuf_init(struct mxbuf *mxbuf, size_t n);
void mxbuf_free(struct mxbuf *mxbuf);
int dns_str_is_ipv4(const char *addr);
dns_status dns_get_mx_records(const char *host, int maxdepth,
struct mxbuf *mxbuf, unsigned long *ttl);
int dns_reverse_ipstr(const char *ipstr, char *revipstr);
dns_status dns_resolve_ipstr(const char *ipstr, const char *domain,
unsigned char *answer, size_t answer_size,
char **hbuf, unsigned long *ttl);
dns_status dns_resolve_hostname(const char *host,
unsigned char *answer, size_t answer_size,
char **ipbuf, unsigned long *ttl);
struct dns_reply {
size_t count;
size_t max;
void **base;
size_t last_len;
size_t last_max;
};
void dns_reply_free(struct dns_reply *r);
static inline GACOPYZ_UINT32_T
dns_reply_ip(struct dns_reply const *repl, size_t n)
{
return *(GACOPYZ_UINT32_T*)repl->base[n];
}
dns_status a_lookup(const char *host,
struct dns_reply *repl, unsigned long *ttl);
dns_status ptr_lookup(struct in_addr ip,
struct dns_reply *repl, unsigned long *ttl);
dns_status txt_lookup(const char *name,
struct dns_reply *repl, unsigned long *ttl);
dns_status ptr_validate(const char *ipstr, char ***vnptr, size_t *vcount,
unsigned long *pttl);
dns_status spf_lookup(const char *domain,
char ***txtv, size_t *txtc, unsigned long *ttl);
#endif
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