Mario Fetka
123 lines
3.4 KiB
C
123 lines
3.4 KiB
C
//
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#ifndef XPLDNS_H
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#define XPLDNS_H
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#include <xplutil.h>
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#define XPLDNS_NAMELEN 256
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/* A TXT RR can contain multiple 255-byte character strings. Keep enough of
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* the concatenated value for modern mail policies without allocating the DNS
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* protocol maximum for every answer record. */
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#define XPLDNS_TXTLEN 16384
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typedef enum {
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XPLDNS_INTERNAL_ERROR = -1, // internal error, see errno
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XPLDNS_SUCCESS = 0,
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XPLDNS_NOT_FOUND = 1, // authoritative host not found
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XPLDNS_TRY_AGAIN = 2, // host not found or server failure
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XPLDNS_DNS_ERROR = 3, // query refused/other non-recoverable
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XPLDNS_NO_DATA = 4, // name valid, no records exist
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XPLDNS_FAIL = 100,
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XPLDNS_FAIL_CNAME_LOOP = 101
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} XplDns_ResultCode;
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typedef enum {
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XPLDNS_RR_A = 0x0001,
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XPLDNS_RR_CNAME = 0x0005,
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XPLDNS_RR_SOA = 0x0006,
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XPLDNS_RR_PTR = 0x000C,
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XPLDNS_RR_MX = 0x000F,
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XPLDNS_RR_TXT = 0x0010
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} XplDns_RecordType;
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typedef struct {
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char name[XPLDNS_NAMELEN + 1]; // Domain name on MX record
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char mxname[XPLDNS_NAMELEN + 1]; // address of record
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unsigned short preference; // Preference of record
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} XplDns_MxRecord;
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typedef struct {
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char name[XPLDNS_NAMELEN + 1]; // Domain name on A record
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int address; // IP address of record
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} XplDns_ARecord;
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typedef struct {
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char name[XPLDNS_NAMELEN + 1]; // Domain name on PTR record
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} XplDns_PtrRecord;
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typedef struct {
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char name[XPLDNS_NAMELEN + 1]; // Domain name on CNAME
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char cname[XPLDNS_NAMELEN + 1]; // what it points to
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} XplDns_CnameRecord;
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typedef struct {
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char mname[XPLDNS_NAMELEN + 1]; // source host
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char rname[XPLDNS_NAMELEN + 1]; // contact e-mail
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unsigned long serial; // serial number
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unsigned long refresh; // refresh time (secs)
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unsigned long retry; // retry time (secs)
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unsigned long expire; // expiry time (secs)
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unsigned long minimum; // minimum TTL (secs)
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} XplDns_SoaRecord;
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typedef struct {
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char txt[XPLDNS_TXTLEN + 1]; // Concatenated TXT character strings
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} XplDns_TxtRecord;
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typedef union {
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XplDns_ARecord A;
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XplDns_CnameRecord CNAME;
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XplDns_MxRecord MX;
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XplDns_PtrRecord PTR;
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XplDns_SoaRecord SOA;
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XplDns_TxtRecord TXT;
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} XplDns_Record;
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typedef struct _XplDns_RecordList XplDns_RecordList;
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struct _XplDns_RecordList {
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XplDns_RecordList *next;
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XplDns_RecordType type;
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XplDns_Record record;
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};
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typedef struct {
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XplDns_ResultCode status;
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int dnssec_authenticated;
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XplDns_RecordList *list;
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} XplDns_Result;
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#define XPLDNS_MAX_IP_IN_LIST 20
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typedef struct{
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XplDns_ResultCode status;
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int dnssec_authenticated;
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int ip_list[XPLDNS_MAX_IP_IN_LIST + 1];
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int number;
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char canonical_name[XPLDNS_NAMELEN + 1];
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} XplDns_IpList;
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typedef struct {
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XplDns_ResultCode status;
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int preference;
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int null_mx;
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int dnssec_authenticated;
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char current_mx[XPLDNS_NAMELEN + 1];
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XplDns_Result *_mx_result;
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XplDns_RecordList *_mx_current;
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} XplDns_MxLookup;
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int XplDnsInit(void);
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void XplDnsResultFree(XplDns_Result *result);
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XplDns_Result * XplDnsLookupIP(const char *domain);
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XplDns_Result * XplDnsLookupTXT(const char *domain);
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int XplDnsMxRecordsAreNull(const XplDns_RecordList *records);
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void XplDnsCanonicalName(const XplDns_RecordList *records,
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const char *hostname, char *canonical,
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size_t canonical_size);
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XplDns_MxLookup *XplDnsNewMxLookup(const char *domain);
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XplDns_IpList * XplDnsNextMxLookupIpList(XplDns_MxLookup *mx);
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void XplDnsFreeMxLookup(XplDns_MxLookup *mx);
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#endif
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