mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-21 11:13:30 +00:00
74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
/*-
|
|
* Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
|
|
#include <sys/socket.h>
|
|
#include <netdb.h>
|
|
#include <netinet/in.h>
|
|
#include <arpa/inet.h>
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include "libutil.h"
|
|
|
|
int
|
|
realhostname(char *host, size_t hsize, const struct in_addr *ip)
|
|
{
|
|
int result;
|
|
struct hostent *hp;
|
|
|
|
result = HOSTNAME_INVALIDADDR;
|
|
hp = gethostbyaddr((char *)ip, sizeof(*ip), AF_INET);
|
|
|
|
if (hp != NULL && strlen(hp->h_name) <= hsize) {
|
|
char lookup[MAXHOSTNAMELEN];
|
|
|
|
strncpy(lookup, hp->h_name, sizeof(lookup) - 1);
|
|
lookup[sizeof(lookup) - 1] = '\0';
|
|
hp = gethostbyname(lookup);
|
|
if (hp == NULL)
|
|
result = HOSTNAME_INVALIDNAME;
|
|
else for (; ; hp->h_addr_list++) {
|
|
if (hp->h_addr_list[0] == NULL) {
|
|
result = HOSTNAME_INCORRECTNAME;
|
|
break;
|
|
}
|
|
if (!memcmp(*hp->h_addr_list, ip, sizeof(*ip))) {
|
|
strncpy(host, lookup, hsize);
|
|
return HOSTNAME_FOUND;
|
|
}
|
|
}
|
|
}
|
|
|
|
strncpy(host, inet_ntoa(*ip), hsize);
|
|
|
|
return result;
|
|
}
|