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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2016-xxxx
license		=	bsd



%%	module

#include "dk4conf.h"
#include "dk4types.h"
#include "dk4mem.h"
#include "dk4sock.h"
#include "dk4mai8dus.h"
#include "dk4mao8d.h"



$!trace-include



/**	Attempt to convert an IPv4 or IPv6 address from text to address.
	@param	dptr	Destination variable.
	@param	str	Source text.
	@return	1 on success, 0 on error.
*/
static
int
dk4socket_c8_find_address(dk4_sockaddr_storage_t *dptr, const char *str)
{
#if DK4_HAVE_STRUCT_SOCKADDR_IN6
  struct sockaddr_in6	*in6;
#endif
  struct sockaddr_in	*in4;
#if DK4_HAVE_STRUCT_SOCKADDR_IN6
  IN6_ADDR	 addr6;
#endif
  IN_ADDR	 addr4;
  int		 back	= 0;
  int		 res;
  $? "+ dk4socket_c8_find_address"
  res = dk4socket_c8_inet_pton(&addr4, sizeof(addr4), AF_INET, str, NULL);
  if (DK4_SOCKET_RESULT_SUCCESS == res) {		$? ". IPv4"
    in4 = (struct sockaddr_in *)dptr;
    in4->sin_family = AF_INET;
    DK4_MEMCPY(&(in4->sin_addr), &addr4, sizeof(addr4));
    back = 1;
  } else {
#if DK4_HAVE_STRUCT_SOCKADDR_IN6
    res = dk4socket_c8_inet_pton(&addr6, sizeof(addr6), AF_INET6, str, NULL);
    if (DK4_SOCKET_RESULT_SUCCESS == res) {		$? ". IPv6"
      in6 = (struct sockaddr_in6 *)dptr;
      in6->sin6_family = AF_INET6;
      DK4_MEMCPY(&(in6->sin6_addr), &addr6, sizeof(addr6));
      back = 1;
    }
#endif
  }
  $? "- dk4socket_c8_find_address %d", back
  return back;
}



/**	Find address for one host name.
	@param	dptr	Address of destination data structure.
	@param	remhost	Remote host name.
	@param	remport	Remote port number in host representation.
	@param	ip4	Flag: Prefer IPv4 over IPv6 addresses.
	@return	1 on success, 0 on error.
*/
static
int
dk4socket_c8_find_host(
  dk4_sockaddr_storage_t	*dptr,
  const char			*remhost,
  unsigned short		 remport,
  int				 ip4
)
{
#if	DK4_HAVE_GETADDRINFO
  char			 buf[16*sizeof(unsigned short)];
  struct addrinfo	 hints;
  struct addrinfo	*results	= NULL;
  struct addrinfo	*rptr		= NULL;
  int			 back		= 0;
  int			 res		= 0;
  $? "+ dk4socket_c8_find_host (getaddrinfo) \"%s\"", TR_8STR(remhost)
  res = dk4ma_write_c8_decimal_unsigned(
    buf, sizeof(buf), (dk4_um_t)remport, 0, NULL
  );
  if (0 != res) {
    DK4_MEMRES(&hints, sizeof(hints));
    hints.ai_family   = AF_UNSPEC;
    hints.ai_socktype = SOCK_DGRAM;
    hints.ai_protocol = 0;
    hints.ai_flags    = AI_NUMERICSERV;
    res = getaddrinfo(remhost, buf, &hints, &results);
    if ((0 == res) && (NULL != results)) {	$? ". getaddrinfo"
      if (0 != ip4) {				$? ". IPv4 preferred"
        rptr = results;
        while ((NULL != rptr) && (0 == back)) {		$? ". entry"
          if ((0 < rptr->ai_addrlen) && (NULL != rptr->ai_addr)) {
	    if (AF_INET == rptr->ai_addr->sa_family) {
	      if (sizeof(dk4_sockaddr_storage_t) >= rptr->ai_addrlen) {
	        DK4_MEMCPY(dptr, rptr->ai_addr, rptr->ai_addrlen);
	        back = 1;				$? ". found"
	      } else {					$? "! address too large"
	      }
	    } else {					$? "! not IPv4"
	    }
	  } else {					$? "! no address data"
	  }
	  rptr = rptr->ai_next;
	}
	if (0 == back) {
          rptr = results;
          while ((NULL != rptr) && (0 == back)) {	$? ". entry"
            if ((0 < rptr->ai_addrlen) && (NULL != rptr->ai_addr)) {
	      if (sizeof(dk4_sockaddr_storage_t) >= rptr->ai_addrlen) {
	        DK4_MEMCPY(dptr, rptr->ai_addr, rptr->ai_addrlen);
	        back = 1;				$? ". found"
	      } else {					$? "! address too large"
	      }
	    } else {					$? "! no address data"
	    }
	    rptr = rptr->ai_next;
	  }
	}
      } else {					$? ". any address family"
        rptr = results;
        while ((NULL != rptr) && (0 == back)) {	$? ". entry"
          if ((0 < rptr->ai_addrlen) && (NULL != rptr->ai_addr)) {
	    if (sizeof(dk4_sockaddr_storage_t) >= rptr->ai_addrlen) {
	      DK4_MEMCPY(dptr, rptr->ai_addr, rptr->ai_addrlen);
	      back = 1;				$? ". found"
	    } else {				$? "! address too large"
	    }
	  } else {				$? "! no address data"
	  }
	  rptr = rptr->ai_next;
	}
      }
    } else {			$? "! getaddrinfo"
    }
    if (NULL != results) { freeaddrinfo(results); }
  } else {			$? "! failed to convert port no to text"
  }
  $? "- dk4socket_c8_find_host %d", back
  return back;
#else
#if DK4_HAVE_GETHOSTBYNAME
#if DK4_HAVE_STRUCT_SOCKADDR_IN6
  struct sockaddr_in6	*sa6;
#endif
  struct sockaddr_in	*sa4;
  struct hostent	*hep	= NULL;
  int			 back	= 0;
  $? "+ dk4socket_c8_find_host (gethostbyname) \"%s\"", TR_8STR(remhost)
  hep = gethostbyname(remhost);
  if (NULL != hep) {					$? ". entry"
    if (NULL != hep->h_addr_list) {			$? ". list"
      if (NULL != *(hep->h_addr_list)) {		$? ". element"
        switch (hep->h_addrtype) {
	  case AF_INET : {				$? ". IPv4"
	    sa4 = (struct sockaddr_in *)dptr;
	    DK4_MEMRES(sa4, sizeof(struct sockaddr_in));
	    sa4->sin_family = AF_INET;
	    sa4->sin_port   = dk4socket_htons(remport);
	    DK4_MEMCPY(&(sa4->sin_addr),*(hep->h_addr_list),sizeof(IN_ADDR));
	    back = 1;					$? ". found"
	  } break;
#if DK4_HAVE_STRUCT_SOCKADDR_IN6
	  case AF_INET6 : {				$? ". IPv6"
	    sa6 = (struct sockaddr_in6 *)dptr;
	    DK4_MEMRES(sa6, sizeof(struct sockaddr_in6));
	    sa6->sin6_family = AF_INET6;
	    sa6->sin_port    = dk4socket_htons(remport);
	    DK4_MEMCPY(&(sa6->sin6_addr),*(hep->h_addr_list),sizeof(IN6_ADDR));
	    back = 1;					$? ". found"
	  } break;
#endif
	}
      } else {						$? "! NULL pointer"
      }
    } else {						$? "! NULL list"
    }
  } else {						$? "! not found"
  }
  $? "- dk4socket_c8_find_host %d", back
  return back;
#else
  int		 back	= 0;
  $? "+ dk4socket_c8_find_host (none) \"%s\"", TR_8STR(remhost)
  $? "- dk4socket_c8_find_host %d", back
  return back;
#endif
#endif
}



int
dk4socket_c8_udp_addresses_numeric(
  dk4_sockaddr_storage_t	*array,
  const	char			*remhost,
  unsigned short		 remport,
  unsigned short		 locport,
  int				 ip4,
  dk4_er_t			*erp
)
{
  int		 back	= DK4_SOCKET_RESULT_FAILED;
  $? "+ dk4socket_c8_udp_addresses_numeric \"%s\"", TR_8STR(remhost)
  if ((NULL != array) && (NULL != remhost) && (0 < remport) && (0 < locport)) {
    DK4_MEMRES(array, (2*sizeof(dk4_sockaddr_storage_t)));
    if (0 != dk4socket_c8_find_address(array, remhost)) {
      $? ". address found"
      back = dk4socket_complete_addresses(array, remport, locport);
      $? ". back =  %d", back
    }
    if (DK4_SOCKET_RESULT_FAILED == back) {		$? ". no addr"
      if (0 != dk4socket_c8_find_host(array, remhost, remport, ip4)) {
        back = dk4socket_complete_addresses(array, remport, locport);
	if (DK4_SOCKET_RESULT_FAILED == back) {		$? "! not completed"
	  dk4error_set_simple_error_code(erp, DK4_E_BUG);
	}
      } else {						$? "! host not found"
        dk4error_set_simple_error_code(erp, DK4_E_NOT_FOUND);
      }
    }
  } else {						$? "! arguments"
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  $? "- dk4socket_c8_udp_addresses_numeric %d", back
  return back;
}