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/*
* pty_make_sane_hostname: Make a sane hostname from an IP address.
* This returns allocated memory!
*
* Copyright 1999, 2000, 2001 by the Massachusetts Institute of
* Technology.
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby
* granted, provided that the above copyright notice appear in all
* copies and that both that copyright notice and this permission
* notice appear in supporting documentation, and that the name of
* M.I.T. not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability
* of this software for any purpose. It is provided "as is" without
* express or implied warranty.
*
*/
#include <com_err.h>
#include "pty-int.h"
#include <sys/socket.h>
#include "libpty.h"
#include <arpa/inet.h>
#include "socket-utils.h"
#define FAI_PREFIX krb5int_pty
#include "fake-addrinfo.c"
static void
downcase (char *s)
{
for (; *s != '\0'; s++)
*s = tolower ((int) *s);
}
long
pty_make_sane_hostname(const struct sockaddr *addr, int maxlen,
int strip_ldomain, int always_ipaddr, char **out)
{
struct addrinfo *ai;
char addrbuf[NI_MAXHOST];
#ifdef HAVE_STRUCT_UTMP_UT_HOST
struct utmp ut;
#else
struct utmpx utx;
#endif
char *cp, *domain;
char lhost[MAXHOSTNAMELEN];
size_t ut_host_len;
/* Note that on some systems (e.g., AIX 4.3.3), we may get an IPv6
address such as ::FFFF:18.18.1.71 when an IPv4 connection comes
in. That's okay; at least on AIX, getnameinfo will deal with
that properly. */
*out = NULL;
if (maxlen && maxlen < 16)
/* assume they meant 16, otherwise IPv4 addr won't fit */
maxlen = 16;
#ifdef HAVE_STRUCT_UTMP_UT_HOST
ut_host_len = sizeof (ut.ut_host);
#else
ut_host_len = sizeof (utx.ut_host);
#endif
if (maxlen == 0)
maxlen = ut_host_len;
*out = malloc(ut_host_len);
if (*out == NULL)
return ENOMEM;
if (always_ipaddr) {
use_ipaddr:
if (getnameinfo (addr, socklen (addr), addrbuf, sizeof (addrbuf),
(char *)0, 0, NI_NUMERICHOST) == 0)
strncpy(*out, addrbuf, ut_host_len);
else
strncpy(*out, "??", ut_host_len);
(*out)[ut_host_len - 1] = '\0';
return 0;
}
/* If we didn't want to chop off the local domain, this would be
much simpler -- just a single getnameinfo call and a strncpy. */
if (getnameinfo(addr, socklen (addr), addrbuf, sizeof (addrbuf),
(char *) NULL, 0, NI_NAMEREQD) != 0)
goto use_ipaddr;
downcase (addrbuf);
if (strip_ldomain) {
struct addrinfo hints;
(void) gethostname(lhost, sizeof (lhost));
memset (&hints, 0, sizeof (hints));
hints.ai_family = PF_UNSPEC;
hints.ai_flags = AI_CANONNAME;
if (getaddrinfo(lhost, (char *)NULL, &hints, &ai) == 0
&& ai != NULL) {
if (ai->ai_canonname != NULL) {
downcase (ai->ai_canonname);
domain = strchr (ai->ai_canonname, '.');
if (domain != NULL) {
cp = strstr (addrbuf, domain);
if (cp != NULL)
*cp = '\0';
}
}
freeaddrinfo (ai);
}
}
strncpy(*out, addrbuf, ut_host_len);
(*out)[ut_host_len - 1] = '\0';
if (strlen(*out) >= maxlen)
goto use_ipaddr;
return 0;
}
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