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%%	options

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


%%	module

#include "dk4sock.h"
#include "dk4mem.h"

#if DK4_HAVE_GETADDRINFO
#include "dk4mao8d.h"
#else
#include "dk4mai8dus.h"
#endif



$!trace-include



/**	Create UDP socket set for a local port number.
	@param	servicename	Local service name.
	@param	local		Flag: Allow local connections only.
	@param	broadcast	Flag: Prepare for broadcast send.
	@param	numeric		Flag: Service name is numeric.
	@param	erp		Error report, may be NULL.
	@return	Socket set on success, NULL on error.
*/
static
dk4_socket_set_t *
dk4socket_c8_set_udp_num_flag(
  const char		*servicename,
  int			 local,
  int			 broadcast,
  int			 numeric,
  dk4_er_t		*erp
)
{
#if DK4_HAVE_GETADDRINFO
  /* +++++ +getaddrinfo */
  struct addrinfo	 hints;
  struct addrinfo	*addri	= NULL;
  struct addrinfo	*paddr	= NULL;
  dk4_socket_set_t	*back	= NULL;
  size_t		 numad	= 0;
  int			 res	= 0;
#if DK4_HAVE_SETSOCKOPT && (defined(SO_REUSEPORT) || defined(SO_REUSEADDR))
  int			 opt	= 0;
#endif
  $? "+ dk4socket_c8_set_udp_num_flag"
  if (NULL != servicename) {
    DK4_MEMRES(&hints, sizeof(hints));
    hints.ai_family = AF_UNSPEC;
    hints.ai_socktype = SOCK_DGRAM;
    hints.ai_flags = 0;
    hints.ai_protocol = 0;
    hints.ai_addrlen = 0;
    hints.ai_canonname = NULL;
    hints.ai_addr = NULL;
    hints.ai_next = NULL;
    if (0 == local)   { hints.ai_flags |= AI_PASSIVE;     }
    if (0 != numeric) { hints.ai_flags |= AI_NUMERICSERV; }
    res = getaddrinfo(NULL, servicename, &hints, &addri);
    if ((0 == res) && (NULL != addri)) {
      paddr = addri;
      while (NULL != paddr) { numad++; paddr = paddr->ai_next; }
      if (0 < numad) {		$? ". numad = %u", (unsigned)numad
        paddr = addri;
	back = dk4socket_set_new(numad, erp);
	if (NULL != back) {
	  while (NULL != paddr) {	$? ". try next address"
	    (back->pSockets)[back->szUsed] = dk4socket_open(
	      paddr->ai_family, SOCK_DGRAM, 0, erp
	    );
	    if (INVALID_SOCKET != (back->pSockets)[back->szUsed]) {
#if DK4_HAVE_SETSOCKOPT && defined(SO_REUSEPORT)
	      $? ". SO_REUSEPORT"
	      dk4socket_set_one_bytes(&opt, sizeof(opt));
	      res = setsockopt(
	        (back->pSockets)[back->szUsed], SOL_SOCKET,
		SO_REUSEPORT, (void *)(&opt), sizeof(opt)
	      );
	      if (0 != res) {		$? "! failed to reuse port number"
	      }
#else
#if DK4_HAVE_SETSOCKOPT && defined(SO_REUSEADDR)
	      $? ". SO_REUSEADDR"
	      dk4socket_set_one_bytes(&opt, sizeof(opt));
	      res = setsockopt(
	        (back->pSockets)[back->szUsed], SOL_SOCKET,
		SO_REUSEADDR, (void *)(&opt), sizeof(opt)
	      );
	      if (0 != res) {		$? "! failed to reuse address"
	      }
#else
	      $? ". neither SO_REUSEPORT nor SO_REUSEADDR"
#endif
#endif
#if DK4_HAVE_SETSOCKOPT && defined(SO_BROADCAST)
	      $? ". SO_BROADCAST"
	      if (0 != broadcast) {
	        dk4socket_set_one_bytes(&opt, sizeof(opt));
	        res = setsockopt(
	          (back->pSockets)[back->szUsed], SOL_SOCKET,
	          SO_BROADCAST, (void *)(&opt), sizeof(opt)
	        );
	        if (0 != res) {		$? "! failed to enable broadcast"
	        }
	      }
#else
	      $? ". can not prepare for broadcast"
#endif
	      res = dk4socket_bind(
	        (back->pSockets)[back->szUsed], paddr->ai_addr,
		paddr->ai_addrlen, erp
	      );
	      if (DK4_SOCKET_RESULT_SUCCESS == res) {
	        back->szUsed += 1;
		$? ". used = %u", (unsigned)(back->szUsed)
	      } else {			$? "! failed to bind address"
	        (void)dk4socket_close((back->pSockets)[back->szUsed], NULL);
		(back->pSockets)[back->szUsed] = INVALID_SOCKET;
	      }
	    } else {			$? "! failed to create socket"
	    }
	    paddr = paddr->ai_next;
	  }
	  if (0 == back->szUsed) {
	    dk4socket_set_delete(back, NULL);
	    back = NULL;
	  }
	}
      }
      freeaddrinfo(addri);
    } else {
      dk4error_set_idetails(erp, DK4_E_SOCKET_GETADDRLOC, res);
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  $? "- dk4socket_c8_set_udp_num_flag"
  return back;
  /* ----- +getaddrinfo */
#else
  /* +++++ -getaddrinfo */
  const char		*endptr	= NULL;
  dk4_socket_set_t	*back	= NULL;
  struct servent	*serv	= NULL;
  int			 iport	= 0;
  int			 res	= 0;
  unsigned short	 portno	= 0;
  $? "+ dk4socket_c8_set_udp_num_flag"
  if (NULL != servicename) {
    res = dk4ma_input_c8_dec_ushort(
      &portno, servicename, &endptr, 1, NULL
    );
    if (0 != res) {
      back = dk4socket_set_udp_directly(portno, local, broadcast, erp);
    } else {
      dk4socket_error_reset();
      serv = getservbyname(servicename, NULL);
      if (NULL != serv) {
        iport = serv->s_port;
	dk4socket_swap_bytes_if_not_bigendian((void *)(&iport), sizeof(iport));
	portno = (unsigned short)iport;
	back = dk4socket_set_udp_directly(portno, local, broadcast, erp);
      } else {
        dk4socket_error_report(erp, DK4_E_SOCKET_GETSERVBYNAME);
      }
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  $? "- dk4socket_c8_set_udp_num_flag"
  return back;
  /* ----- -getaddrinfo */
#endif
}



dk4_socket_set_t *
dk4socket_c8_set_udp(
  unsigned short	 portno,
  int			 local,
  int			 broadcast,
  dk4_er_t		*erp
)
{
#if DK4_HAVE_GETADDRINFO
  /* +++++ +getaddrinfo */
  char			 pnb[16*sizeof(dk4_um_t)];
  dk4_socket_set_t	*back = NULL;
  int			 res;
  if (0 < portno) {
    res = dk4ma_write_c8_decimal_unsigned(
      pnb, sizeof(pnb), (dk4_um_t)portno, 0, erp
    );
    if (0 != res) {
      back = dk4socket_c8_set_udp_num_flag(
        pnb, local, broadcast, 1, erp
      );
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
  /* ----- +getaddrinfo */
#else
  /* +++++ -getaddrinfo */
  return (
    dk4socket_set_udp_directly(portno, local, broadcast, erp)
  );
  /* ----- -getaddrinfo */
#endif
}



dk4_socket_set_t *
dk4socket_c8_set_udp_service(
  const char		*servicename,
  int			 local,
  int			 broadcast,
  dk4_er_t		*erp
)
{
  return (
    dk4socket_c8_set_udp_num_flag(servicename, local, broadcast, 0, erp)
  );
}