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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2015-xxxx
license		=	bsd

%%	module


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



$!trace-include



dk4_socket_set_t *
dk4socket_set_server_directly(
  unsigned short	 portno,
  int			 backlog,
  int			 local,
  dk4_er_t		*erp
)
{
#if DK4_HAVE_STRUCT_SOCKADDR_IN6
  struct sockaddr_in6	 soin6;
#endif
  struct sockaddr_in	 soin4;
  dk4_socket_set_t	*back = NULL;
  size_t		 max;
  int			 res;
#if DK4_HAVE_SETSOCKOPT && (defined(SO_REUSEPORT) || defined(SO_REUSEADDR))
  int			 opt;
#endif

  if (0 < portno) {
    max = 1;
#if DK4_HAVE_STRUCT_SOCKADDR_IN6
    max++;
#endif
    back = dk4socket_set_new(max, erp);
    if (NULL != back) {
      /*	IPv4 address
      */
      DK4_MEMRES(&soin4, sizeof(soin4));
      soin4.sin_family = AF_INET;
      soin4.sin_port   = dk4socket_htons(portno);
      if (0 != local) {
        soin4.sin_addr.s_addr   = dk4socket_htonl(INADDR_LOOPBACK);
      } else {
        soin4.sin_addr.s_addr   = dk4socket_htonl(INADDR_ANY);
      }
      (back->pSockets)[back->szUsed] = dk4socket_open(
        AF_INET, SOCK_STREAM, 0, erp
      );
      if (INVALID_SOCKET != (back->pSockets)[back->szUsed]) {
#if DK4_HAVE_SETSOCKOPT && defined(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

        res = dk4socket_bind(
	  (back->pSockets)[back->szUsed],
	  (struct sockaddr *)(&soin4),
	  sizeof(soin4),
	  erp
	);
	if (DK4_SOCKET_RESULT_SUCCESS == res) {
	  res = dk4socket_listen(
	    (back->pSockets)[back->szUsed],
	    backlog,
	    erp
	  );
	  if (DK4_SOCKET_RESULT_SUCCESS == res) {
	    back->szUsed += 1;
	  } else {
	    (void)dk4socket_close((back->pSockets)[back->szUsed], NULL);
	    (back->pSockets)[back->szUsed] = INVALID_SOCKET;
	  }
	} else {
	  (void)dk4socket_close((back->pSockets)[back->szUsed], NULL);
	  (back->pSockets)[back->szUsed] = INVALID_SOCKET;
	}
      }
      /*	IPv6 address if available
      */
#if DK4_HAVE_STRUCT_SOCKADDR_IN6
      DK4_MEMRES(&soin6, sizeof(soin6));
      soin6.sin6_family = AF_INET6;
      if (0 != local) { soin6.sin6_addr.s6_addr[15] = 0x01; }
      soin6.sin6_port   = dk4socket_htons(portno);
      (back->pSockets)[back->szUsed] = dk4socket_open(
        AF_INET6, SOCK_STREAM, 0, erp
      );
      if (INVALID_SOCKET != (back->pSockets)[back->szUsed]) {
#if DK4_HAVE_SETSOCKOPT && defined(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
        res = dk4socket_bind(
	  (back->pSockets)[back->szUsed],
	  (struct sockaddr *)(&soin6),
	  sizeof(soin6),
	  erp
	);
	if (DK4_SOCKET_RESULT_SUCCESS == res) {
	  res = dk4socket_listen(
	    (back->pSockets)[back->szUsed],
	    backlog,
	    erp
	  );
	  if (DK4_SOCKET_RESULT_SUCCESS == res) {
	    back->szUsed += 1;
	  } else {
	    (void)dk4socket_close((back->pSockets)[back->szUsed], NULL);
	    (back->pSockets)[back->szUsed] = INVALID_SOCKET;
	  }
	} else {
	  (void)dk4socket_close((back->pSockets)[back->szUsed], NULL);
	  (back->pSockets)[back->szUsed] = INVALID_SOCKET;
	}
      }
#endif
      if (0 == back->szUsed) {
        dk4socket_set_delete(back, NULL);
	back = NULL;
      }
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}