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/***************************************************************************
* getaddrinfo.c -- A **PARTIAL** implementation of the getaddrinfo(3) *
* hostname resolution call. In particular, IPv6 is not supported and *
* neither are some of the flags. Service "names" are always returned as *
* port numbers. *
* *
***********************IMPORTANT NMAP LICENSE TERMS************************
* *
* The Nmap Security Scanner is (C) 1996-2012 Insecure.Com LLC. Nmap is *
* also a registered trademark of Insecure.Com LLC. This program is free *
* software; you may redistribute and/or modify it under the terms of the *
* GNU General Public License as published by the Free Software *
* Foundation; Version 2 with the clarifications and exceptions described *
* below. This guarantees your right to use, modify, and redistribute *
* this software under certain conditions. If you wish to embed Nmap *
* technology into proprietary software, we sell alternative licenses *
* (contact sales@insecure.com). Dozens of software vendors already *
* license Nmap technology such as host discovery, port scanning, OS *
* detection, version detection, and the Nmap Scripting Engine. *
* *
* Note that the GPL places important restrictions on "derived works", yet *
* it does not provide a detailed definition of that term. To avoid *
* misunderstandings, we interpret that term as broadly as copyright law *
* allows. For example, we consider an application to constitute a *
* "derivative work" for the purpose of this license if it does any of the *
* following: *
* o Integrates source code from Nmap *
* o Reads or includes Nmap copyrighted data files, such as *
* nmap-os-db or nmap-service-probes. *
* o Executes Nmap and parses the results (as opposed to typical shell or *
* execution-menu apps, which simply display raw Nmap output and so are *
* not derivative works.) *
* o Integrates/includes/aggregates Nmap into a proprietary executable *
* installer, such as those produced by InstallShield. *
* o Links to a library or executes a program that does any of the above *
* *
* The term "Nmap" should be taken to also include any portions or derived *
* works of Nmap, as well as other software we distribute under this *
* license such as Zenmap, Ncat, and Nping. This list is not exclusive, *
* but is meant to clarify our interpretation of derived works with some *
* common examples. Our interpretation applies only to Nmap--we don't *
* speak for other people's GPL works. *
* *
* If you have any questions about the GPL licensing restrictions on using *
* Nmap in non-GPL works, we would be happy to help. As mentioned above, *
* we also offer alternative license to integrate Nmap into proprietary *
* applications and appliances. These contracts have been sold to dozens *
* of software vendors, and generally include a perpetual license as well *
* as providing for priority support and updates. They also fund the *
* continued development of Nmap. Please email sales@insecure.com for *
* further information. *
* *
* As a special exception to the GPL terms, Insecure.Com LLC grants *
* permission to link the code of this program with any version of the *
* OpenSSL library which is distributed under a license identical to that *
* listed in the included docs/licenses/OpenSSL.txt file, and distribute *
* linked combinations including the two. You must obey the GNU GPL in all *
* respects for all of the code used other than OpenSSL. If you modify *
* this file, you may extend this exception to your version of the file, *
* but you are not obligated to do so. *
* *
* If you received these files with a written license agreement or *
* contract stating terms other than the terms above, then that *
* alternative license agreement takes precedence over these comments. *
* *
* 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 (none *
* have been found so far). *
* *
* Source code also allows you to port Nmap to new platforms, fix bugs, *
* and add new features. You are highly encouraged to send your changes *
* to nmap-dev@insecure.org for possible incorporation into the main *
* distribution. By sending these changes to Fyodor or one of the *
* Insecure.Org development mailing lists, or checking them into the Nmap *
* source code repository, it is understood (unless you specify otherwise) *
* that you are offering the Nmap Project (Insecure.Com LLC) the *
* unlimited, non-exclusive right to reuse, modify, and relicense the *
* code. Nmap will always be available Open Source, but this is important *
* because the inability to relicense code has caused devastating problems *
* for other Free Software projects (such as KDE and NASM). We also *
* occasionally relicense the code to third parties as discussed above. *
* If you wish to specify special license conditions of your *
* contributions, just say so when you send them. *
* *
* This program 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. See the GNU *
* General Public License v2.0 for more details at *
* http://www.gnu.org/licenses/gpl-2.0.html , or in the COPYING file *
* included with Nmap. *
* *
***************************************************************************/
/* $Id: getaddrinfo.c 28192 2012-03-01 06:53:35Z fyodor $ */
#include "nbase.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
#if HAVE_NETDB_H
#include <netdb.h>
#endif
#include <assert.h>
#if !defined(HAVE_GAI_STRERROR) || defined(__MINGW32__)
#ifdef __MINGW32__
#undef gai_strerror
#endif
const char *gai_strerror(int errcode) {
static char customerr[64];
switch (errcode) {
case EAI_FAMILY:
return "ai_family not supported";
case EAI_NODATA:
return "no address associated with hostname";
case EAI_NONAME:
return "hostname nor servname provided, or not known";
default:
Snprintf(customerr, sizeof(customerr), "unknown error (%d)", errcode);
return "unknown error.";
}
return NULL; /* unreached */
}
#endif
#ifdef __MINGW32__
char* WSAAPI gai_strerrorA (int errcode)
{
return gai_strerror(errcode);
}
#endif
#ifndef HAVE_GETADDRINFO
void freeaddrinfo(struct addrinfo *res) {
struct addrinfo *next;
do {
next = res->ai_next;
free(res);
} while ((res = next) != NULL);
}
/* Allocates and initializes a new AI structure with the port and IPv4
address specified in network byte order */
static struct addrinfo *new_ai(unsigned short portno, u32 addr)
{
struct addrinfo *ai;
ai = (struct addrinfo *) safe_malloc(sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
memset(ai, 0, sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
ai->ai_family = AF_INET;
ai->ai_addrlen = sizeof(struct sockaddr_in);
ai->ai_addr = (struct sockaddr *)(ai + 1);
ai->ai_addr->sa_family = AF_INET;
#if HAVE_SOCKADDR_SA_LEN
ai->ai_addr->sa_len = ai->ai_addrlen;
#endif
((struct sockaddr_in *)(ai)->ai_addr)->sin_port = portno;
((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr;
return(ai);
}
int getaddrinfo(const char *node, const char *service,
const struct addrinfo *hints, struct addrinfo **res) {
struct addrinfo *cur, *prev = NULL;
struct hostent *he;
struct in_addr ip;
unsigned short portno;
int i;
if (service)
portno = htons(atoi(service));
else
portno = 0;
if (hints && hints->ai_flags & AI_PASSIVE) {
*res = new_ai(portno, htonl(0x00000000));
return 0;
}
if (!node) {
*res = new_ai(portno, htonl(0x7f000001));
return 0;
}
if (inet_pton(AF_INET, node, &ip)) {
*res = new_ai(portno, ip.s_addr);
return 0;
}
he = gethostbyname(node);
if (he && he->h_addr_list[0]) {
for (i = 0; he->h_addr_list[i]; i++) {
cur = new_ai(portno, ((struct in_addr *)he->h_addr_list[i])->s_addr);
if (prev)
prev->ai_next = cur;
else
*res = cur;
prev = cur;
}
return 0;
}
return EAI_NODATA;
}
#endif /* HAVE_GETADDRINFO */
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