/*++ /* 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); }