src/c-api/mdnsd.h

#ifndef mdnsd_h
#define mdnsd_h
#include "1035.h"
#include <sys/time.h>

#define SRV_PORT 6464

#ifndef RECORD_MAX_TRIES
#define RECORD_MAX_TRIES -1
#endif

#ifndef QUERY_MAX_TRIES
#define QUERY_MAX_TRIES -1
#endif

typedef struct mdnsd_struct *mdnsd; // main daemon data
typedef struct mdnsdr_struct *mdnsdr; // record entry
// answer data
typedef struct mdnsda_struct
{
    unsigned char *name;
    unsigned short int type;
    unsigned long int ttl;
    unsigned short int rdlen;
    unsigned char *rdata;
    unsigned long int ip; // A
    unsigned char *rdname; // NS/CNAME/PTR/SRV
    struct { unsigned short int priority, weight, port; } srv; // SRV
} *mdnsda;

// Global functions
//

mdnsd mdnsd_new(int aClass, int frame);
//
// gracefully shutdown the daemon, use mdnsd_out() to get the last packets
void mdnsd_shutdown(mdnsd d);
//
// flush all cached records (network/interface changed)
void mdnsd_flush(mdnsd d);
//
// free given mdnsd (should have used mdnsd_shutdown() first!)
void mdnsd_free(mdnsd d);
//

// I/O functions
//
// incoming message from host (to be cached/processed)
void mdnsd_in(mdnsd d, struct message *m, unsigned long int ip, unsigned short int port);
//
// outgoing messge to be delivered to host, returns >0 if one was returned and m/ip/port set
int mdnsd_out(mdnsd d, struct message *m, unsigned long int *ip, unsigned short int *port);

struct timeval* mdnsd_sleep(mdnsd d);

unsigned int mdnsd_sleep_millis(mdnsd);


// Q/A functions
// 
// register a new query
//   answer(record, arg) is called whenever one is found/changes/expires (immediate or anytime after, mdnsda valid until ->ttl==0)
//   either answer returns -1, or another mdnsd_query with a NULL answer will remove/unregister this query
void mdnsd_query(mdnsd d, 
                 char* host, 
                 int type, 
                 int (*answer)(mdnsda a, void *arg), 
                 void *arg);

void _mdnsd_query(mdnsd d,
                  char *host,
                  int type,
                  int (*answer)(mdnsda a, void *arg),
                  void *arg,
                  char* target_host,
                  int target_port);
//
// returns the first (if last == NULL) or next answer after last from the cache
//   mdnsda only valid until an I/O function is called
mdnsda mdnsd_list(mdnsd d, char *host, int type, mdnsda last);
//

// Publishing functions
//
// create a new unique record (try mdnsda_list first to make sure it's not used)
//   conflict(arg) called at any point when one is detected and unable to recover
//   after the first data is set_*(), any future changes effectively expire the old one and attempt to create a new unique record
mdnsdr mdnsd_unique(mdnsd d, char *host, int type, long int ttl, void (*conflict)(char *host, int type, void *arg), void *arg);

mdnsdr _mdnsd_unique(mdnsd d,
                     char *host,
                     int type,
                     long int ttl,
                     void (*conflict)(char *host, int type, void *arg),
                     void *arg,
                     char* target_host,
                     int target_port);

mdnsdr mdnsd_shared(mdnsd d, char *host, int type, long int ttl);

mdnsdr _mdnsd_shared(mdnsd d,
                     char *host,
                     int type,
                     long int ttl,
                     char* target_host,
                     int target_port);
//
// de-list the given record
void mdnsd_done(mdnsd d, mdnsdr r);
//
// these all set/update the data for the given record, nothing is published until they are called
void mdnsd_set_raw(mdnsd d, mdnsdr r, unsigned char *data, int len);
void mdnsd_set_host(mdnsd d, mdnsdr r, char *name);
void mdnsd_set_ip(mdnsd d, mdnsdr r, unsigned long int ip);
void mdnsd_set_srv(mdnsd d, mdnsdr r, int priority, int weight, int port, char *name);
//

#ifdef DEBUG
#define INFO
#endif

#ifdef INFO
#include "xht.h"

void debug_walker(xht h, const char* key, void* val, void* arg);
#endif

#endif

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