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#if !defined(lint) && !defined(DOS)
static char rcsid[] = "$Id: canonicl.c 764 2007-10-23 23:44:49Z hubert@u.washington.edu $";
#endif
/*
* ========================================================================
* Copyright 2013-2021 Eduardo Chappa
* Copyright 2006 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* ========================================================================
*/
#include "../../c-client/mail.h"
extern unsigned char *lcase(unsigned char *);
#ifdef _WINDOWS
/* wingdi.h uses ERROR (!) and we aren't using the c-client ERROR so... */
#undef ERROR
#endif
#include <system.h>
#include "canonicl.h"
/*----------------------------------------------------------------------
Return canonical form of host name ala c-client (UNIX version).
Args: host -- The host name
Result: Canonical form, or input argument (worst case)
You can call it twice without worrying about copying
the results, but not more than twice.
----*/
char *
canonical_name(char *host)
{
struct hostent *hent;
char tmp[MAILTMPLEN];
static int whichbuf = 0;
static char buf[2][NETMAXHOST+1];
char *b;
whichbuf = (whichbuf + 1) % 2;
b = buf[whichbuf];
/* domain literal is easy */
if (host[0] == '[' && host[(strlen (host))-1] == ']')
strncpy(b, host, NETMAXHOST);
else{
strncpy(tmp, host, sizeof(tmp)-1);
tmp[sizeof(tmp)-1] = '\0';
hent = gethostbyname((char *) lcase((unsigned char *) tmp));
if(hent && hent->h_name)
strncpy(b, hent->h_name, NETMAXHOST);
else
strncpy(b, host, NETMAXHOST);
}
b[NETMAXHOST] = '\0';
return(b);
}
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