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/*++
/* NAME
/* get_domainname 3
/* SUMMARY
/* network domain name lookup
/* SYNOPSIS
/* #include <get_domainname.h>
/*
/* const char *get_domainname()
/* DESCRIPTION
/* get_domainname() returns the local domain name as obtained
/* by stripping the hostname component from the result from
/* get_hostname(). The result is the hostname when get_hostname()
/* does not return a FQDN form ("foo"), or its result has only two
/* components ("foo.com").
/* DIAGNOSTICS
/* Fatal errors: no hostname, invalid hostname.
/* SEE ALSO
/* get_hostname(3)
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
/* System library. */
#include <sys_defs.h>
#include <string.h>
/* Utility library. */
#include "mymalloc.h"
#include "get_hostname.h"
#include "get_domainname.h"
/* Local stuff. */
static char *my_domain_name;
/* get_domainname - look up my domain name */
const char *get_domainname(void)
{
const char *host;
const char *dot;
/*
* Use the hostname when it is not a FQDN ("foo"), or when the hostname
* actually is a domain name ("foo.com").
*/
if (my_domain_name == 0) {
host = get_hostname();
if ((dot = strchr(host, '.')) == 0 || strchr(dot + 1, '.') == 0) {
my_domain_name = mystrdup(host);
} else {
my_domain_name = mystrdup(dot + 1);
}
}
return (my_domain_name);
}
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