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getnameinfo.c
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/*
* Mar 8, 2000 by Hajimu UMEMOTO <[email protected]>
*
* This module is besed on ssh-1.2.27-IPv6-1.5 written by
* KIKUCHI Takahiro <[email protected]>
*/
/*
* Copyright (c) 1994-2008 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any legal
* details, please contact
* Carnegie Mellon University
* Center for Technology Transfer and Enterprise Creation
* 4615 Forbes Avenue
* Suite 302
* Pittsburgh, PA 15213
* (412) 268-7393, fax: (412) 268-7395
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* $Id: getnameinfo.c,v 1.8 2010/01/06 17:01:45 murch Exp $
*/
/*
* fake library for ssh
*
* This file includes getnameinfo().
* These funtions are defined in rfc2133.
*
* But these functions are not implemented correctly. The minimum subset
* is implemented for ssh use only. For exapmle, this routine assumes
* that ai_family is AF_INET. Don't use it for another purpose.
*
* In the case not using 'configure --enable-ipv6', this getnameinfo.c
* will be used if you have broken getnameinfo or no getnameinfo.
*/
#include "config.h"
#include <arpa/inet.h>
#include <stdio.h>
#include <string.h>
int
getnameinfo(const struct sockaddr *sa, socklen_t salen __attribute__((unused)),
char *host, size_t hostlen, char *serv, size_t servlen, int flags)
{
struct sockaddr_in *sin = (struct sockaddr_in *)sa;
struct hostent *hp;
char tmpserv[16];
if (serv) {
snprintf(tmpserv, sizeof(tmpserv), "%d", ntohs(sin->sin_port));
if (strlen(tmpserv) > servlen)
return EAI_MEMORY;
else
strcpy(serv, tmpserv);
}
if (host) {
if (flags & NI_NUMERICHOST) {
if (flags & NI_NAMEREQD)
return EAI_NONAME;
if (strlen(inet_ntoa(sin->sin_addr)) >= hostlen)
return EAI_MEMORY;
else {
strcpy(host, inet_ntoa(sin->sin_addr));
return 0;
}
} else {
hp = gethostbyaddr((char *)&sin->sin_addr,
sizeof(struct in_addr), AF_INET);
if (hp)
if (strlen(hp->h_name) >= hostlen)
return EAI_MEMORY;
else {
strcpy(host, hp->h_name);
return 0;
}
else if (flags & NI_NAMEREQD)
return EAI_NONAME;
else if (strlen(inet_ntoa(sin->sin_addr)) >= hostlen)
return EAI_MEMORY;
else {
strcpy(host, inet_ntoa(sin->sin_addr));
return 0;
}
}
}
return 0;
}