pith/osdep/canonicl.c

   1 #if !defined(lint) && !defined(DOS)
   2 static char rcsid[] = "$Id: canonicl.c 764 2007-10-23 23:44:49Z hubert@u.washington.edu $";
   3 #endif
   4
   5 /*
   6  * ========================================================================
   7  * Copyright 2013-2018 Eduardo Chappa
   8  * Copyright 2006 University of Washington
   9  *
  10  * Licensed under the Apache License, Version 2.0 (the "License");
  11  * you may not use this file except in compliance with the License.
  12  * You may obtain a copy of the License at
  13  *
  14  *     http://www.apache.org/licenses/LICENSE-2.0
  15  *
  16  * ========================================================================
  17  */
  18
  19 #include "../../c-client/mail.h"
  20 extern unsigned char *lcase(unsigned char *);
  21
  22 #ifdef _WINDOWS
  23 /* wingdi.h uses ERROR (!) and we aren't using the c-client ERROR so... */
  24 #undef ERROR
  25 #endif
  26
  27 #include <system.h>
  28
  29 #include "canonicl.h"
  30
  31
  32 /*----------------------------------------------------------------------
  33        Return canonical form of host name ala c-client (UNIX version).
  34
  35    Args: host      -- The host name
  36
  37  Result: Canonical form, or input argument (worst case)
  38
  39  You can call it twice without worrying about copying
  40  the results, but not more than twice.
  41  ----*/
  42 char *
  43 canonical_name(char *host)
  44 {
  45     struct hostent *hent;
  46     char tmp[MAILTMPLEN];
  47     static int  whichbuf = 0;
  48     static char buf[2][NETMAXHOST+1];
  49     char       *b;
  50
  51     whichbuf = (whichbuf + 1) % 2;
  52     b = buf[whichbuf];
  53
  54                                 /* domain literal is easy */
  55     if (host[0] == '[' && host[(strlen (host))-1] == ']')
  56       strncpy(b, host, NETMAXHOST);
  57     else{
  58         strncpy(tmp, host, sizeof(tmp)-1);
  59         tmp[sizeof(tmp)-1] = '\0';
  60
  61         hent = gethostbyname((char *) lcase((unsigned char *) tmp));
  62         if(hent && hent->h_name)
  63           strncpy(b, hent->h_name, NETMAXHOST);
  64         else
  65           strncpy(b, host, NETMAXHOST);
  66     }
  67
  68     b[NETMAXHOST] = '\0';
  69     return(b);
  70 }
  71
  72