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%%	options

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



%%	module

#include "dk4sock.h"
#include "dk4mem.h"
#include "dk4mao8d.h"

#if !DK4_HAVE_GETADDRINFO
#include "dk4mai8dus.h"
#endif


$!trace-include



#if DK4_HAVE_GETADDRINFO
/* +++++ +getaddrinfo +++++ */

/**	Create client socket for given address lists.
	@param	hostname	Remote host name to connect to.
	@param	raddrst		List of remote addresses.
	@param	laddrst		List of local addresses to use, optional.
	@param	secs		Seconds for timeout.
	@param	usecs		Microseconds for timeout.
	@param	erp		Error report, may be NULL.
	@return	Valid socket on success, INVALID_SOCKET on error.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if any argument is bad,
	- DK4_E_SOCKET_SOCKET<br>
	  if the socket() function failed to create a new socket,
	- DK4_E_SOCKET_BIND<br>
	  if the bind() function failed to bind the requested local address,
	- DK4_E_SOCKET_FCNTL<br>
	  if the fcntl() function failed,
	- DK4_E_SOCKET_IOCTLSOCKET
	  if the ioctlsocket() function failed.
	- DK4_E_SOCKET_CONNECT<br>
	  if the connect() function failed,
	- DK4_E_SOCKET_TIMEOUT<br>
	  if a timeout occured in the connect attempt,
	- DK4_E_SOCKET_SELECT<br>
	  if the select() function failed,
	- DK4_E_SOCKET_GETSOCKOPT<br>
	  if the getsockopt() function failed.
	For all error codes - except DK4_E_SOCKET_TIMEOUT - the iDetails1
	field contains the errno or WSAGetLastError() value.
*/
static
dk4_socket_t
dk4socket_c8_tcp_client_addresses(
  const char		*hostname,
  struct addrinfo	*raddrst,
  struct addrinfo	*laddrst,
  long			 secs,
  long			 usecs,
  dk4_er_t		*erp
)
{
  struct addrinfo	*ra;
  struct addrinfo	*la;
  dk4_socket_t		 back	= INVALID_SOCKET;
  $? "+ dk4socket_c8_tcp_client_addresses"
  ra = raddrst;
  while ((INVALID_SOCKET == back) && (NULL != ra)) {
    if (NULL != laddrst) {
      la = laddrst;
      while ((INVALID_SOCKET == back) && (NULL != la)) {
        if (la->ai_family == ra->ai_family) {
$? ". remote = %d PTR=%d %lu", (int)(ra->ai_family), TR_IPTR(ra->ai_addr), (unsigned long)(ra->ai_addrlen)
$? ". local  = %d PTR=%d %lu", (int)(la->ai_family), TR_IPTR(la->ai_addr), (unsigned long)(la->ai_addrlen)
$!trace-code dk4socket_debug_address("remote", ra->ai_addr, ra->ai_addrlen);
$!trace-code dk4socket_debug_address("local ", la->ai_addr, la->ai_addrlen);
          back = dk4socket_tcp_client_for_addr(
	    ra->ai_family, ra->ai_addr, ra->ai_addrlen,
	    la->ai_addr, la->ai_addrlen, secs, usecs, erp
	  );
	  if (INVALID_SOCKET != back) {
	    la = NULL; ra = NULL;
	  }
	}
        if (NULL != la) { la = la->ai_next; }
      }
    } else {
      back = dk4socket_tcp_client_for_addr(
        ra->ai_family, ra->ai_addr, ra->ai_addrlen, NULL, 0,
	secs, usecs, erp
      );
      if (INVALID_SOCKET != back) {
        ra = NULL;
      }
    }
    if (NULL != ra) { ra = ra->ai_next; }
  }
  $? "- dk4socket_c8_tcp_client_addresses %d", (int)back
  return back;
}

/* ----- +getaddrinfo ----- */
#else
/* +++++ -getaddrinfo +++++ */

#if DK4_HAVE_STRUCT_SOCKADDR_IN6
/**	used to initialize IPv6 address for binding local ports.
*/
static const IN6_ADDR dk4socket_any6 = IN6ADDR_ANY_INIT;
#endif

/* ----- -getaddrinfo ----- */
#endif



dk4_socket_t
dk4socket_c8_tcp_client_host_num_srv(
  const char		*hostname,
  const char		*svcname,
  const char		*lsvcname,
  long			 secs,
  long			 usecs,
  int			 nsrv,
  dk4_er_t		*erp
)
{
#if DK4_HAVE_GETADDRINFO
  /* +++++ +getaddrinfo */
  struct addrinfo	 rhints;	 /* Hints for remote address */
  struct addrinfo	 lhints;	 /* Hints for local address */
  struct addrinfo	*raddrst = NULL; /* Storage for remote addresses */
  struct addrinfo	*laddrst = NULL; /* Storage for local addresses */
  int			 res;		 /* Operation result */
  dk4_socket_t		 back	= INVALID_SOCKET;
  $? "+ dk4socket_c8_tcp_client_host_num_srv (+getaddrinfo)"
  if ((NULL != hostname) && (NULL != svcname)) {	$? ". args ok"
    $? ". have getaddrinfo"
    DK4_MEMRES(&rhints, sizeof(rhints));
    rhints.ai_family = AF_UNSPEC;
    rhints.ai_socktype = SOCK_STREAM;
    if (0 != nsrv) { rhints.ai_flags = AI_NUMERICSERV; }
    rhints.ai_protocol = 0;
    res = getaddrinfo(hostname, svcname, &rhints, &raddrst);
    if ((0 == res) && (NULL != raddrst)) {
      if (NULL != lsvcname) {
        DK4_MEMRES(&lhints, sizeof(lhints));
        lhints.ai_family = AF_UNSPEC;
        lhints.ai_socktype = SOCK_STREAM;
	lhints.ai_flags = AI_PASSIVE;
        if (0 != nsrv) { lhints.ai_flags |= AI_NUMERICSERV; }
        lhints.ai_protocol = 0;
	res = getaddrinfo(NULL, lsvcname, &lhints, &laddrst);
	if ((0 == res) && (NULL != laddrst)) {
	  back = dk4socket_c8_tcp_client_addresses(
	    hostname, raddrst, laddrst, secs, usecs, erp
	  );
	  if (NULL != laddrst) { freeaddrinfo(laddrst); }
	} else {				$? "! bug"
	  /* ERROR: getaddrinfo failed */
	  dk4error_set_idetails(erp, DK4_E_SOCKET_GETADDRLOC, res);
	}
      } else {
        back = dk4socket_c8_tcp_client_addresses(
	  hostname, raddrst, NULL, secs, usecs, erp
	);
      }
      if (NULL != raddrst) { freeaddrinfo(raddrst); }
    } else {					$? "! host not found"
      /* ERROR: getaddrinfo failed */
      dk4error_set_idetails(erp, DK4_E_SOCKET_GETADDRINFO, res);
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  $? "- dk4socket_c8_tcp_client_host_num_srv %d", (int)back
  return back;
  /* ----- +getaddrinfo */
#else
  /* +++++ -getaddrinfo */
  struct servent	*serv	= NULL;	/* Service entry */
  const char		*endptr	= NULL;	/* End of used text */
  int			 iport	= 0;	/* Port number from servent */
  unsigned short	 rport	= 0;	/* Remote port number */
  unsigned short	 lport	= 0;	/* Local port number */
  int			 res;		/* Operation result */
  dk4_socket_t		 back	= INVALID_SOCKET;
  $? "+ dk4socket_c8_tcp_client_host_num_srv (-getaddrinfo)"
  if ((NULL != hostname) && (NULL != svcname)) {	$? ". args ok"
    res = dk4ma_input_c8_dec_ushort(&rport, svcname, &endptr, 1, NULL);
    if (0 == res) {
      dk4socket_error_reset();
      serv = getservbyname(svcname, NULL);
      if (NULL != serv) {
        iport = serv->s_port;
	dk4socket_swap_bytes_if_not_bigendian((void *)(&iport), sizeof(iport));
	rport = (unsigned short)iport;
      } else {
        dk4socket_error_report(erp, DK4_E_SOCKET_GETSERVBYNAME);
      }
    }
    if (0 != rport) {
      if (NULL != lsvcname) {
        endptr = NULL;
        res = dk4ma_input_c8_dec_ushort(&lport, lsvcname, &endptr, 1, NULL);
	if (0 == res) {
	  dk4socket_error_reset();
	  serv = getservbyname(lsvcname, NULL);
	  if (NULL != serv) {
	    iport = serv->s_port;
	    dk4socket_swap_bytes_if_not_bigendian(
	      (void *)(&iport), sizeof(iport)
	    );
	    lport = (unsigned short)iport;
	  } else {
	    dk4socket_error_report(erp, DK4_E_SOCKET_GETSERVBYNAME);
	  }
	}
	if (0 != lport) {
	  back = dk4socket_c8_tcp_client_host_port(
	    hostname, rport, lport, secs, usecs, erp
	  );
	}
      } else {
        back = dk4socket_c8_tcp_client_host_port(
	  hostname, rport, (unsigned short)0, secs, usecs, erp
	);
      }
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  $? "- dk4socket_c8_tcp_client_host_num_srv %d", (int)back
  return back;
  /* ----- -getaddrinfo */
#endif
}



dk4_socket_t
dk4socket_c8_tcp_client_host_srv(
  const char		*hostname,
  const char		*svcname,
  const char		*lsvcname,
  long			 secs,
  long			 usecs,
  dk4_er_t		*erp
)
{
  return (
    dk4socket_c8_tcp_client_host_num_srv(
      hostname, svcname, lsvcname, secs, usecs, 0, erp
    )
  );
}



dk4_socket_t
dk4socket_c8_tcp_client_host_port(
  const	char		*hostname,
  unsigned short	 portno,
  unsigned short	 lportno,
  long			 secs,
  long			 usecs,
  dk4_er_t		*erp
)
{
#if DK4_HAVE_GETADDRINFO
  /* +++++ +getaddrinfo */
  char			 rpnb[16*sizeof(dk4_um_t)];	/* Remote port no */
  char			 lpnb[16*sizeof(dk4_um_t)];	/* Local port no */
  int			 res;
  dk4_socket_t		  back	= INVALID_SOCKET;
  $? "+ dk4socket_c8_tcp_client_host_port"
  if ((NULL != hostname) && (0 < portno)) {
    res = dk4ma_write_c8_decimal_unsigned(
      rpnb, sizeof(rpnb), (dk4_um_t)portno, 0, erp
    );
    if (0 != res) {
      if (0 < lportno) {
        res = dk4ma_write_c8_decimal_unsigned(
	  lpnb, sizeof(lpnb), (dk4_um_t)lportno, 0, erp
	);
	if (0 != res) {
	  back = dk4socket_c8_tcp_client_host_num_srv(
	    hostname, rpnb, lpnb, secs, usecs, 1, erp
	  );
	} else {				$? "! bug"
	}
      } else {
        back = dk4socket_c8_tcp_client_host_num_srv(
	  hostname, rpnb, NULL, secs, usecs, 1, erp
	);
      }
    } else {					$? "! bug"
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
  /* ----- -getaddrinfo */
  /* ----- +getaddrinfo */
#else
  /* +++++ -getaddrinfo */
#if DK4_HAVE_STRUCT_SOCKADDR_IN6
  struct sockaddr_in6	  sr6;
  struct sockaddr_in6	  sl6;
#endif
  struct sockaddr_in	  sr4;
  struct sockaddr_in	  sl4;
  char			**addrptr;
  struct hostent	* hep	= NULL;
  dk4_socket_t		  back	= INVALID_SOCKET;
  $? "+ dk4socket_c8_tcp_client_host_port"
  if ((NULL != hostname) && (0 < portno)) {
    hep = gethostbyname(hostname);
    if (NULL != hep) {				$? ". hep"
      if (NULL != hep->h_addr_list) {		$? ". addrlist"
        switch (hep->h_addrtype) {
	  case AF_INET : {			$? ". AF_INET"
	    if (4 == hep->h_length) {		$? ". h_length"
	      addrptr = hep->h_addr_list;
	      while ((INVALID_SOCKET == back) && (NULL != *addrptr)) {
	        DK4_MEMRES(&sr4, sizeof(sr4));
		sr4.sin_family = AF_INET;
		sr4.sin_port   = dk4socket_htons(portno);
		DK4_MEMCPY(&(sr4.sin_addr), *addrptr, sizeof(IN_ADDR));
$!trace-code dk4socket_debug_address("remote", (struct sockaddr *)(&sr4), sizeof(sr4));
		if (0 != lportno) {
		  DK4_MEMRES(&sl4, sizeof(sl4));
		  sl4.sin_family = AF_INET;
		  sl4.sin_port   = dk4socket_htons(lportno);
		  sl4.sin_addr.s_addr = dk4socket_htonl(INADDR_ANY);
$!trace-code dk4socket_debug_address("local ", (struct sockaddr *)(&sl4), sizeof(sl4));
		  back = dk4socket_tcp_client_for_addr(
		    AF_INET, (struct sockaddr *)(&sr4), sizeof(sr4),
		    (struct sockaddr *)(&sl4), sizeof(sl4),
		    secs, usecs, erp
		  );
		} else {
		  back = dk4socket_tcp_client_for_addr(
		    AF_INET, (struct sockaddr *)(&sr4), sizeof(sr4),
		    NULL, 0, secs, usecs, erp
		  );
		}
		addrptr++;
	      }
	    } else {					$? "!. h_length"
	      /* ERROR: Address length mismatch */
	      dk4error_set_simple_error_code(erp, DK4_E_BUG);
	    }
	  } break;
#if DK4_HAVE_STRUCT_SOCKADDR_IN6
	  case AF_INET6 : {				$? ". AF_INET6"
	    if (16 == hep->h_length) {
	      addrptr = hep->h_addr_list;
	      while ((INVALID_SOCKET == back) && (NULL != *addrptr)) {
	        DK4_MEMRES(&sr6, sizeof(sr6));
		sr6.sin6_family = AF_INET6;
		sr6.sin6_port   = dk4socket_htons(portno);
		DK4_MEMCPY(&(sr6.sin6_addr), *addrptr, sizeof(IN6_ADDR));
		if (0 != lportno) {
		  DK4_MEMRES(&sl6, sizeof(sl6));
		  sl6.sin6_family = AF_INET6;
		  sl6.sin6_port   = dk4socket_htons(lportno);
		  DK4_MEMCPY(&(sl6.sin6_addr), &dk4socket_any6, sizeof(IN6_ADDR));
		  back = dk4socket_tcp_client_for_addr(
		    AF_INET6, (struct sockaddr *)(&sr6), sizeof(sr6),
		    (struct sockaddr *)(&sl6), sizeof(sl6),
		    secs, usecs, erp
		  );
		} else {
		  back = dk4socket_tcp_client_for_addr(
		    AF_INET6, (struct sockaddr *)(&sr6), sizeof(sr6),
		    NULL, 0, secs, usecs, erp
		  );
		}
	        addrptr++;
	      }
	    } else {
	      /* ERROR: Address length mismatch */
	      dk4error_set_simple_error_code(erp, DK4_E_BUG);
	    }
	  } break;
#endif
	  default : {
	    /* ERROR: Unknown protocol */
	    dk4error_set_simple_error_code(erp, DK4_E_BUG);
	  } break;
	}
      } else {						$? "! addrlist"
        /* ERROR: Host not found (empty list) */
	dk4error_set_simple_error_code(erp, DK4_E_BUG);
      }
    } else {						$? "! hep"
      /* ERROR: Host not found */
      dk4socket_error_report(erp, DK4_E_SOCKET_GETHOSTBYNAME);
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
  /* ----- -getaddrinfo */
#endif
}