getfullhostname.c

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/*
 * Copyright (C) 1996-2023 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.
 */
 
#include "squid.h"
#include "getfullhostname.h"
 
#if HAVE_UNISTD_H
/* for gethostname() function */
#include <unistd.h>
#endif
#if HAVE_NETDB_H
/* for gethostbyname() */
#include <netdb.h>
#endif
 
/* for RFC 2181 constants */
#include "rfc2181.h"
 
/* for xstrncpy() - may need breaking out of there. */
#include "util.h"
 
const char *
getfullhostname(void)
{
    const struct hostent *hp = NULL;
    // TODO: make this dynamic so the duration limit is flexible
    static char buf[RFC2181_MAXHOSTNAMELEN + 1];
 
    if (gethostname(buf, RFC2181_MAXHOSTNAMELEN) < 0)
        return NULL;
    // TODO: convert this to a getaddrinfo() call
    if ((hp = gethostbyname(buf)) != NULL)
        xstrncpy(buf, hp->h_name, RFC2181_MAXHOSTNAMELEN);
    return buf;
}