fusl/src/network/lookup.h

#ifndef LOOKUP_H
#define LOOKUP_H

#include <stdint.h>
#include <stddef.h>

struct address {
  int family;
  unsigned scopeid;
  uint8_t addr[16];
  int sortkey;
};

struct service {
  uint16_t port;
  unsigned char proto, socktype;
};

#define MAXNS 3

struct resolvconf {
  struct address ns[MAXNS];
  unsigned nns, attempts, ndots;
  unsigned timeout;
};

/* The limit of 48 results is a non-sharp bound on the number of addresses
 * that can fit in one 512-byte DNS packet full of v4 results and a second
 * packet full of v6 results. Due to headers, the actual limit is lower. */
#define MAXADDRS 48
#define MAXSERVS 2

int __lookup_serv(struct service buf[static MAXSERVS],
                  const char* name,
                  int proto,
                  int socktype,
                  int flags);
int __lookup_name(struct address buf[static MAXADDRS],
                  char canon[static 256],
                  const char* name,
                  int family,
                  int flags);
int __lookup_ipliteral(struct address buf[static 1],
                       const char* name,
                       int family);

int __get_resolv_conf(struct resolvconf*, char*, size_t);

#endif