usr/src/lib/libwrap/fromhost.c

   1 /*
   2  * Copyright 2001 Sun Microsystems, Inc.  All rights reserved.
   3  * Use is subject to license terms.
   4  */
   5 #pragma ident   "%Z%%M% %I%     %E% SMI"
   6
   7  /*
   8   * On socket-only systems, fromhost() is nothing but an alias for the
   9   * socket-specific sock_host() function.
  10   *
  11   * On systems with sockets and TLI, fromhost() determines the type of API
  12   * (sockets, TLI), then invokes the appropriate API-specific routines.
  13   *
  14   * Diagnostics are reported through syslog(3).
  15   *
  16   * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
  17   */
  18
  19 #ifndef lint
  20 static char sccsid[] = "@(#) fromhost.c 1.17 94/12/28 17:42:23";
  21 #endif
  22
  23 #if defined(TLI) || defined(PTX) || defined(TLI_SEQUENT)
  24
  25 /* System libraries. */
  26
  27 #include <sys/types.h>
  28 #include <sys/tiuser.h>
  29 #include <stropts.h>
  30
  31 /* Local stuff. */
  32
  33 #include "tcpd.h"
  34
  35 /* fromhost - find out what network API we should use */
  36
  37 void    fromhost(request)
  38 struct request_info *request;
  39 {
  40
  41     /*
  42      * On systems with streams support the IP network protocol family may be
  43      * accessible via more than one programming interface: Berkeley sockets
  44      * and the Transport Level Interface (TLI).
  45      *
  46      * Thus, we must first find out what programming interface to use: sockets
  47      * or TLI. On some systems, sockets are not part of the streams system,
  48      * so if request->fd is not a stream we simply assume sockets.
  49      */
  50
  51     if (ioctl(request->fd, I_FIND, "timod") > 0) {
  52         tli_host(request);
  53     } else {
  54         sock_host(request);
  55     }
  56 }
  57
  58 #endif /* TLI || PTX || TLI_SEQUENT */