qdns.h

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#ifndef QSMTP_DNS_H
#define QSMTP_DNS_H

#include <netinet/in.h>

enum mx_special_priorities {
        MX_PRIORITY_IMPLICIT = 65536,   
        MX_PRIORITY_USED = 65537,       
        MX_PRIORITY_CURRENT = 65538     
};

struct ips {
        struct in6_addr *addr;  
        char *name;             
        unsigned int priority;  
        unsigned short count;   
        struct ips *next;       
};

#define FOREACH_STRUCT_IPS(_ptr, _s, _list) \
        for (_ptr = _list, _s = 0; _ptr != NULL; (_s < _ptr->count - 1) ? (_s++) : (_ptr = _ptr->next, _s = 0))

/* lib/qdns.c */

extern int ask_dnsmx(const char *, struct ips **) __attribute__ ((nonnull (1,2)));
extern int ask_dnsaaaa(const char *, struct in6_addr **) __attribute__ ((nonnull (1,2)));
extern int ask_dnsa(const char *, struct in6_addr **) __attribute__ ((nonnull (1)));
extern int ask_dnsname(const struct in6_addr *, char **) __attribute__ ((nonnull (1,2)));

/* lib/dnshelpers.c */

extern void freeips(struct ips *);
extern int domainvalid(const char * const) __attribute__ ((pure)) __attribute__ ((nonnull (1)));
extern void sortmx(struct ips **p) __attribute__ ((nonnull (1)));
extern struct ips *in6_to_ips(struct in6_addr *a, unsigned int cnt, const unsigned int priority) __attribute__ ((nonnull (1)));

#ifndef INET_ADDRSTRLEN
#define INET_ADDRSTRLEN 16
#endif

enum dns_errors {
        DNS_ERROR_LOCAL = -1,   
        DNS_ERROR_TEMP = -2,    
        DNS_ERROR_PERM = -3     
};

static inline struct in6_addr
in_addr_to_v4mapped(const struct in_addr *ip4)
{
        struct in6_addr ret;

        ret.s6_addr32[0] = htonl(0);
        ret.s6_addr32[1] = htonl(0);
        ret.s6_addr32[2] = htonl(0xffff);
        ret.s6_addr32[3] = ip4->s_addr;

        return ret;
}

extern int inet_pton_v4mapped(const char *str, struct in6_addr *addr) __attribute__ ((nonnull (1,2)));

#endif