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255 lines
12 KiB
C
255 lines
12 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) 1996-2015 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 ("GPL"), BUT ONLY WITH ALL OF THE CLARIFICATIONS *
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* AND EXCEPTIONS DESCRIBED HEREIN. This guarantees your right to use, *
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* modify, and redistribute this software under certain conditions. If *
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* you wish to embed Nmap technology into proprietary software, we sell *
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* alternative licenses (contact sales@nmap.com). Dozens of software *
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* vendors already license Nmap technology such as host discovery, port *
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* scanning, OS detection, version detection, and the Nmap Scripting *
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* Engine. *
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* *
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* Note that the GPL places important restrictions on "derivative works", *
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* yet 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 with any software or content covered by this license *
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* ("Covered Software"): *
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* *
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* o Integrates source code from Covered Software. *
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* *
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* o Reads or includes copyrighted data files, such as Nmap's nmap-os-db *
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* or nmap-service-probes. *
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* *
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* o Is designed specifically to execute Covered Software and parse the *
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* results (as opposed to typical shell or execution-menu apps, which will *
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* execute anything you tell them to). *
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* *
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* o Includes Covered Software in a proprietary executable installer. The *
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* installers produced by InstallShield are an example of this. Including *
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* Nmap with other software in compressed or archival form does not *
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* trigger this provision, provided appropriate open source decompression *
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* or de-archiving software is widely available for no charge. For the *
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* purposes of this license, an installer is considered to include Covered *
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* Software even if it actually retrieves a copy of Covered Software from *
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* another source during runtime (such as by downloading it from the *
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* Internet). *
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* *
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* o Links (statically or dynamically) to a library which does any of the *
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* above. *
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* *
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* o Executes a helper program, module, or script to do any of the above. *
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* *
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* This list is not exclusive, but is meant to clarify our interpretation *
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* of derived works with some common examples. Other people may interpret *
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* the plain GPL differently, so we consider this a special exception to *
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* the GPL that we apply to Covered Software. Works which meet any of *
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* these conditions must conform to all of the terms of this license, *
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* particularly including the GPL Section 3 requirements of providing *
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* source code and allowing free redistribution of the work as a whole. *
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* *
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* As another 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. *
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* *
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* Any redistribution of Covered Software, including any derived works, *
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* must obey and carry forward all of the terms of this license, including *
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* obeying all GPL rules and restrictions. For example, source code of *
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* the whole work must be provided and free redistribution must be *
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* allowed. All GPL references to "this License", are to be treated as *
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* including the terms and conditions of this license text as well. *
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* *
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* Because this license imposes special exceptions to the GPL, Covered *
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* Work may not be combined (even as part of a larger work) with plain GPL *
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* software. The terms, conditions, and exceptions of this license must *
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* be included as well. This license is incompatible with some other open *
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* source licenses as well. In some cases we can relicense portions of *
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* Nmap or grant special permissions to use it in other open source *
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* software. Please contact fyodor@nmap.org with any such requests. *
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* Similarly, we don't incorporate incompatible open source software into *
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* Covered Software without special permission from the copyright holders. *
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* *
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* If you have any questions about the licensing restrictions on using *
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* Nmap in other works, are happy to help. As mentioned above, we also *
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* 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@nmap.com for further *
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* information. *
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* *
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* If you have received a written license agreement or contract for *
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* Covered Software stating terms other than these, you may choose to use *
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* and redistribute Covered Software under those terms instead of these. *
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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. *
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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 the dev@nmap.org mailing list for possible incorporation into the *
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* main 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 Nmap *
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* license file for more details (it's in a COPYING file included with *
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* Nmap, and also available from https://svn.nmap.org/nmap/COPYING) *
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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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