/usr/include/postfix/valid_hostname.h is in postfix-dev 2.11.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 | #ifndef _VALID_HOSTNAME_H_INCLUDED_
#define _VALID_HOSTNAME_H_INCLUDED_
/*++
/* NAME
/* valid_hostname 3h
/* SUMMARY
/* validate hostname
/* SYNOPSIS
/* #include <valid_hostname.h>
/* DESCRIPTION
/* .nf
/* External interface */
#define VALID_HOSTNAME_LEN 255 /* RFC 1035 */
#define VALID_LABEL_LEN 63 /* RFC 1035 */
#define DONT_GRIPE 0
#define DO_GRIPE 1
extern int valid_hostname(const char *, int);
extern int valid_hostaddr(const char *, int);
extern int valid_ipv4_hostaddr(const char *, int);
extern int valid_ipv6_hostaddr(const char *, int);
extern int valid_hostport(const char *, int);
/* 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
/*--*/
#endif
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