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/***************************************************************************
* getnameinfo.c -- A **PARTIAL** implementation of the getnameinfo(3) *
* host resolution call. In particular, IPv6 is not supported and neither *
* are some of the flags. Service "names" are always returned as decimal *
* port numbers. *
* *
***********************IMPORTANT NMAP LICENSE TERMS************************
*
* The Nmap Security Scanner is (C) 1996-2023 Nmap Software LLC ("The Nmap
* Project"). Nmap is also a registered trademark of the Nmap Project.
*
* This program is distributed under the terms of the Nmap Public Source
* License (NPSL). The exact license text applying to a particular Nmap
* release or source code control revision is contained in the LICENSE
* file distributed with that version of Nmap or source code control
* revision. More Nmap copyright/legal information is available from
* https://nmap.org/book/man-legal.html, and further information on the
* NPSL license itself can be found at https://nmap.org/npsl/ . This
* header summarizes some key points from the Nmap license, but is no
* substitute for the actual license text.
*
* Nmap is generally free for end users to download and use themselves,
* including commercial use. It is available from https://nmap.org.
*
* The Nmap license generally prohibits companies from using and
* redistributing Nmap in commercial products, but we sell a special Nmap
* OEM Edition with a more permissive license and special features for
* this purpose. See https://nmap.org/oem/
*
* If you have received a written Nmap license agreement or contract
* stating terms other than these (such as an Nmap OEM license), you may
* choose to use and redistribute Nmap under those terms instead.
*
* The official Nmap Windows builds include the Npcap software
* (https://npcap.com) for packet capture and transmission. It is under
* separate license terms which forbid redistribution without special
* permission. So the official Nmap Windows builds may not be redistributed
* without special permission (such as an Nmap OEM license).
*
* Source is provided to this software because we believe users have a
* right to know exactly what a program is going to do before they run it.
* This also allows you to audit the software for security holes.
*
* Source code also allows you to port Nmap to new platforms, fix bugs, and add
* new features. You are highly encouraged to submit your changes as a Github PR
* or by email to the dev@nmap.org mailing list for possible incorporation into
* the main distribution. Unless you specify otherwise, it is understood that
* you are offering us very broad rights to use your submissions as described in
* the Nmap Public Source License Contributor Agreement. This is important
* because we fund the project by selling licenses with various terms, and also
* because the inability to relicense code has caused devastating problems for
* other Free Software projects (such as KDE and NASM).
*
* The free version of Nmap is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Warranties,
* indemnification and commercial support are all available through the
* Npcap OEM program--see https://nmap.org/oem/
*
***************************************************************************/
/* $Id$ */
#include "nbase.h"
#if HAVE_NETDB_H
#include <netdb.h>
#endif
#include <assert.h>
#include <stdio.h>
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
int getnameinfo(const struct sockaddr *sa, size_t salen,
char *host, size_t hostlen,
char *serv, size_t servlen, int flags) {
struct sockaddr_in *sin = (struct sockaddr_in *)sa;
struct hostent *he;
if (sin->sin_family != AF_INET || salen != sizeof(struct sockaddr_in))
return EAI_FAMILY;
if (serv != NULL) {
Snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
return 0;
}
if (host) {
if (flags & NI_NUMERICHOST) {
Strncpy(host, inet_ntoa(sin->sin_addr), hostlen);
return 0;
} else {
he = gethostbyaddr((char *)&sin->sin_addr, sizeof(struct in_addr),
AF_INET);
if (he == NULL) {
if (flags & NI_NAMEREQD)
return EAI_NONAME;
Strncpy(host, inet_ntoa(sin->sin_addr), hostlen);
return 0;
}
assert(he->h_name);
Strncpy(host, he->h_name, hostlen);
return 0;
}
}
return 0;
}
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