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