/*  sockadapt.c
 *
 *  Author: Charles Bailey  bailey@genetics.upenn.edu
 *  Last Revised:  4-Mar-1997
 *
 *  This file should contain stubs for any of the TCP/IP functions perl5
 *  requires which are not supported by your TCP/IP stack.  These stubs
 *  can attempt to emulate the routine in question, or can just return
 *  an error status or cause perl to die.
 *
 *  This version is set up for perl5 with UCX (or emulation) via
 *  the DECCRTL or SOCKETSHR 0.9D.
 */

#include "EXTERN.h"
#include "perl.h"

#if defined(__DECC) && defined(__DECC_VER) && (__DECC_VER >= 50200000)
#  define __sockadapt_my_hostent_t __struct_hostent_ptr32
#  define __sockadapt_my_netent_t __struct_netent_ptr32
#  define __sockadapt_my_servent_t __struct_servent_ptr32
#  define __sockadapt_my_addr_t   __in_addr_t
#  define __sockadapt_my_name_t   const char *
#else
#  define __sockadapt_my_hostent_t struct hostent *
#  define __sockadapt_my_netent_t struct netent *
#  define __sockadapt_my_servent_t struct servent *
#  define __sockadapt_my_addr_t   long
#  define __sockadapt_my_name_t   char *
#endif

/* We have these on VMS 7.0 and above, or on Dec C 5.6 if it's providing */
/* the 7.0 DECC RTL */
#if ((((__VMS_VER >= 70000000) && (__DECC_VER >= 50200000)) || (__CRTL_VER >= 70000000)) && defined(DECCRTL_SOCKETS))
#else
void setnetent(int stayopen) {
  croak("Function \"setnetent\" not implemented in this version of perl");
}
void endnetent() {
  croak("Function \"endnetent\" not implemented in this version of perl");
}
#endif

#if defined(DECCRTL_SOCKETS)
   /* Use builtin socket interface in DECCRTL and
    * UCX emulation in whatever TCP/IP stack is present.
    */

#if ((__VMS_VER >= 70000000) && (__DECC_VER >= 50200000)) || (__CRTL_VER >= 70000000)
#else
  void sethostent(int stayopen) {
    croak("Function \"sethostent\" not implemented in this version of perl");
  }
  void endhostent() {
    croak("Function \"endhostent\" not implemented in this version of perl");
  }
  void setprotoent(int stayopen) {
    croak("Function \"setprotoent\" not implemented in this version of perl");
  }
  void endprotoent() {
    croak("Function \"endprotoent\" not implemented in this version of perl");
  }
  void setservent(int stayopen) {
    croak("Function \"setservent\" not implemented in this version of perl");
  }
  void endservent() {
    croak("Function \"endservent\" not implemented in this version of perl");
  }
  __sockadapt_my_hostent_t gethostent() {
    croak("Function \"gethostent\" not implemented in this version of perl");
    return (__sockadapt_my_hostent_t )NULL; /* Avoid MISSINGRETURN warning, not reached */
  }
  __sockadapt_my_servent_t getservent() {
    croak("Function \"getservent\" not implemented in this version of perl");
    return (__sockadapt_my_servent_t )NULL; /* Avoid MISSINGRETURN warning, not reached */
  }
#endif

#else
    /* Work around things missing/broken in SOCKETSHR. */

__sockadapt_my_netent_t getnetbyaddr( __sockadapt_my_addr_t net, int type) {
  croak("Function \"getnetbyaddr\" not implemented in this version of perl");
  return (struct netent *)NULL; /* Avoid MISSINGRETURN warning, not reached */
}
__sockadapt_my_netent_t getnetbyname( __sockadapt_my_name_t name) {
  croak("Function \"getnetbyname\" not implemented in this version of perl");
  return (struct netent *)NULL; /* Avoid MISSINGRETURN warning, not reached */
}
__sockadapt_my_netent_t getnetent() {
  croak("Function \"getnetent\" not implemented in this version of perl");
  return (__sockadapt_my_netent_t )NULL; /* Avoid MISSINGRETURN warning, not reached */
}

/* Some TCP/IP implementations seem to return success, when getpeername()
 * is called on a UDP socket, but the port and in_addr are all zeroes.
 */

int my_getpeername(int sock, struct sockaddr *addr, int *addrlen) {
  static char nowhere[] = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
  int rslt;

  rslt = si_getpeername(sock, addr, addrlen);

  /* Just pass an error back up the line */
  if (rslt) return rslt;

  /* If the call succeeded, make sure we don't have a zeroed port/addr */
  if (addr->sa_family == AF_INET &&
      !memcmp((char *)addr + sizeof(u_short), nowhere,
              sizeof(u_short) + sizeof(struct in_addr))) {
    rslt = -1;
    SETERRNO(ENOTCONN,SS$_CLEARED);
  }
  return rslt;
}
#endif /* SOCKETSHR stuff */
