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%%	options

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


%%	module

#include "dk4sock.h"

#include <stdio.h>

#if !DK4_ON_WINDOWS
#if DK4_HAVE_FCNTL_H
#ifndef FCNTL_H_INCLUDED
#include <fcntl.h>
#define	FCNTL_H_INCLUDED 1
#endif
#endif
#endif

#if DK4_HAVE_ERRNO_H
#ifndef ERRNO_H_INCLUDED
#include <errno.h>
#define	ERRNO_H_INCLUDED 1
#endif
#endif

#if DK4_HAVE_UNISTD_H
#ifndef	UNISTD_H_INCLUDED
#include <unistd.h>
#define	UNISTD_H_INCLUDED 1
#endif
#endif

#if DK4_HAVE_IO_H
#ifndef	IO_H_INCLUDED
#include <io.h>
#define	IO_H_INCLUDED 1
#endif
#endif

#if DK4_HAVE_STRING_H
#ifndef	STRING_H_INCLUDED
#include <string.h>
#define	STRING_H_INCLUDED 1
#endif
#endif

$!trace-include



static
dk4_socket_t
dk4socket_tcp_client_cleanup_socket(
  dk4_socket_t		 sock,
  int			 level,
  struct sockaddr	*pAddr,
  size_t		 szAddr
)
{
#if 0
  /*	Setting SO_REUSEADDR or SO_REUSEPORT must follow socket()
  	immediately.
  */
  if ((0 < level) || ((NULL != pAddr) && (0 < szAddr))) {
    (void)dk4socket_option_set_reuse(sock, 1, NULL);
  }
#endif

#if DK4_ON_WINDOWS
  closesocket(sock);
#else
  close(sock);
#endif
  return (INVALID_SOCKET);
}



static
dk4_socket_t
dk4socket_tcp_client_connect_attempt(
  dk4_socket_t		 back,
  struct sockaddr	*pAddr,
  size_t		 szAddr,
  struct sockaddr	*pLoAddr,
  size_t		 szLoAddr,
  long			 secs,
  long			 usecs,
  dk4_er_t		*erp
)
{
  fd_set		 wfds;
  struct timeval	 to;
#if (!DK4_ON_WINDOWS) && (DK4_HAVE_SETSOCKOPT) \
	&& defined(SOL_SOCKET) && defined(SO_ERROR)
#if DK4_HAVE_SOCKLEN_T
  socklen_t		 slo;
#else
  int			 slo;
#endif
  int			 err;
#endif
  int			 res;
  $? "+ dk4socket_tcp_client_connect_attempt"
  $? ". remote = PTR=%d %lu", TR_IPTR(pAddr), (unsigned long)szAddr
  res = dk4socket_connect(back, pAddr, szAddr, erp);
  switch (res) {
    case DK4_SOCKET_RESULT_SUCCESS : {		$? ". connected"
      /* do nothing */
    } break;
    case DK4_SOCKET_RESULT_IN_PROGRESS : {	$? ". in progress"
      FD_ZERO(&wfds);
      FD_SET(back, &wfds);
      to.tv_sec = secs;
      to.tv_usec = usecs;
      dk4socket_error_reset();
      res = select((((int)back) + 1), NULL, &wfds, NULL, &to);
      if (0 < res) {				$? ". select"
        if (FD_ISSET(back, &wfds)) {		$? ". in write set"
#if (!DK4_ON_WINDOWS) && (DK4_HAVE_SETSOCKOPT) \
	&& defined(SOL_SOCKET) && defined(SO_ERROR)
	  err = 0;
	  slo = sizeof(err);
	  dk4socket_error_reset();
	  res = getsockopt(back, SOL_SOCKET, SO_ERROR, &err, &slo);
	  if (0 == res) {			$? ". getsockopt ok"
	    if (0 != dk4socket_non_null_getsockopt(err, slo)) {
	      $? "! non-null from getsockopt"
	      dk4error_set_idetails(erp, DK4_E_SOCKET_CONNECT, err);
	      back = dk4socket_tcp_client_cleanup_socket(
	        back, 1, pLoAddr, szLoAddr
	      );
	    }
#if VERSION_BEFORE_20160415
	    if (sizeof(int) != slo) {
	      if (0 != err) {			$? "! error from getsockopt"
	        dk4error_set_idetails(erp, DK4_E_SOCKET_CONNECT, err);
		back = dk4socket_tcp_client_cleanup_socket(
		  back, 1, pLoAddr, szLoAddr
		);
	      }
	    } else {				$? "! getsockopt (size)"
	      dk4socket_error_report(erp, DK4_E_SOCKET_GETSOCKOPT);
	      back = dk4socket_tcp_client_cleanup_socket(
	        back, 1, pLoAddr, szLoAddr
	      );
	    }
#endif
	  } else {				$? "! getsockopt"
	    dk4socket_error_report(erp, DK4_E_SOCKET_GETSOCKOPT);
	    back = dk4socket_tcp_client_cleanup_socket(back,1,pLoAddr,szLoAddr);
	  }
#endif
	} else {				$? "! timeout (not in list)"
	  dk4error_set_simple_error_code(erp, DK4_E_SOCKET_TIMEOUT);
	  back = dk4socket_tcp_client_cleanup_socket(back,0,pLoAddr,szLoAddr);
	}
      } else {
        if (0 > res) {				$? "! select"
          dk4socket_error_report(erp, DK4_E_SOCKET_SELECT);
	} else {				$? "! timeout (from select)"
	  dk4error_set_simple_error_code(erp, DK4_E_SOCKET_TIMEOUT);
	}
	back = dk4socket_tcp_client_cleanup_socket(back,0,pLoAddr,szLoAddr);
      }
    } break;
    default : {						$? "! failed"
      back = dk4socket_tcp_client_cleanup_socket(back, 0, pLoAddr, szLoAddr);
    } break;
  }
  $? "- dk4socket_tcp_client_connect_attempt %d", (int)back
  return back;
}



dk4_socket_t
dk4socket_tcp_client_for_addr(
  int			 protfam,
  struct sockaddr	*pRemoteAddr,
  size_t		 szRemoteAddr,
  struct sockaddr	*pLocalAddr,
  size_t		 szLocalAddr,
  long			 seconds,
  long			 microSeconds,
  dk4_er_t		*erp
)
{
  dk4_socket_t		 back	= INVALID_SOCKET;
  int			 res;
#if DK4_HAVE_SETSOCKOPT && (defined(SO_REUSEPORT) || defined(SO_REUSEADDR))
  int			 opt	= 0;
#endif
  $? "+ dk4socket_tcp_client_for_addr"
  if ((NULL != pRemoteAddr) && (0 < szRemoteAddr)) {	$? ". args ok"
    $? ". remote = PTR=%d %lu",TR_IPTR(pRemoteAddr),(unsigned long)szRemoteAddr
    back = dk4socket_open(protfam, SOCK_STREAM, 0, erp);
    if (INVALID_SOCKET != back) {			$? ". socket"
      if ((NULL != pLocalAddr) && (0 < szLocalAddr)) {	$? ". must bind"
#if DK4_HAVE_SETSOCKOPT && defined(SO_REUSEPORT)
	$? ". SO_REUSEPORT"
	dk4socket_set_one_bytes(&opt, sizeof(opt));
	res = setsockopt(
	  back, 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, 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, pLocalAddr, szLocalAddr, erp);
	if (DK4_SOCKET_RESULT_FAILED == res) {		$? "! bind"
	  back = dk4socket_tcp_client_cleanup_socket(
	    back, 0, pLocalAddr, szLocalAddr
	  );
	}
      }
      if (INVALID_SOCKET != back) {
        if ((0L != seconds) || (0L != microSeconds)) {	$? ". use timeout"
	  res = dk4socket_option_set_nonblock(back, 1, erp);
	  if (DK4_SOCKET_RESULT_SUCCESS == res) {	$? ". non-blocking"
	    back = dk4socket_tcp_client_connect_attempt(
	      back, pRemoteAddr, szRemoteAddr, pLocalAddr, szLocalAddr,
	      seconds, microSeconds, erp
	    );
	    if (INVALID_SOCKET != back) {
	      res = dk4socket_option_set_nonblock(back, 0, erp);
	      if (DK4_SOCKET_RESULT_SUCCESS != res) {	$? "! back blocking"
	        back = dk4socket_tcp_client_cleanup_socket(
		  back, 1, pLocalAddr, szLocalAddr
		);
	      }
	    }
	  } else {					$? "! non-blocking"
	    back = dk4socket_tcp_client_cleanup_socket(
	      back, 0, pLocalAddr, szLocalAddr
	    );
	  }
	} else {					$? ". no timeout"
	  back = dk4socket_tcp_client_connect_attempt(
	    back, pRemoteAddr, szRemoteAddr, pLocalAddr, szLocalAddr,
	    0L, 0L, erp
	  );
	}
      }
    } else {						$? "! socket"
      $? "! errno=%d", errno
    }
  } else {						$? "! args"
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  $? "- dk4socket_tcp_client_for_addr %d", (int)back
  return back;
}