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249 lines
13 KiB
C++
249 lines
13 KiB
C++
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/***************************************************************************
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* MACLookup.cc -- This relatively simple system handles looking up the *
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* vendor registered to a MAC address using the nmap-mac-prefixes *
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* database. *
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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) 1996-2013 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 (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 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 "nmap.h"
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#include <map>
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/* Character pool memory allocation */
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#include "MACLookup.h"
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#include "NmapOps.h"
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#include "nmap_error.h"
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#include "charpool.h"
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extern NmapOps o;
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std::map<int, char *> MacTable;
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static inline int MacCharPrefix2Key(const u8 *prefix) {
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return (prefix[0] << 16) + (prefix[1] << 8) + prefix[2];
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}
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static void mac_prefix_init() {
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static int initialized = 0;
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if (initialized) return;
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initialized = 1;
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char filename[256];
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FILE *fp;
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char line[128];
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int pfx;
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char *endptr, *vendor;
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int lineno = 0;
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/* Now it is time to read in all of the entries ... */
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if (nmap_fetchfile(filename, sizeof(filename), "nmap-mac-prefixes") != 1){
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error("Cannot find nmap-mac-prefixes: Ethernet vendor correlation will not be performed");
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return;
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}
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fp = fopen(filename, "r");
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if (!fp) {
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error("Unable to open %s. Ethernet vendor correlation will not be performed ", filename);
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return;
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}
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/* Record where this data file was found. */
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o.loaded_data_files["nmap-mac-prefixes"] = filename;
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while(fgets(line, sizeof(line), fp)) {
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lineno++;
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if (*line == '#') continue;
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if (!isxdigit((int) (unsigned char) *line)) {
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error("Parse error one line #%d of %s. Giving up parsing.", lineno, filename);
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break;
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}
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/* First grab the prefix */
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pfx = strtol(line, &endptr, 16);
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if (!endptr || !isspace((int) (unsigned char) *endptr)) {
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error("Parse error one line #%d of %s. Giving up parsing.", lineno, filename);
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break;
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}
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/* Now grab the vendor */
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while(*endptr && isspace((int) (unsigned char) *endptr)) endptr++;
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assert(*endptr);
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vendor = endptr;
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while(*endptr && *endptr != '\n' && *endptr != '\r') endptr++;
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*endptr = '\0';
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if (MacTable.find(pfx) == MacTable.end()) {
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MacTable[pfx] = cp_strdup(vendor);
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} else {
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if (o.debugging > 1)
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error("MAC prefix %06X is duplicated in %s; ignoring duplicates.", pfx, filename);
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}
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}
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fclose(fp);
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return;
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}
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static const char *findMACEntry(int prefix) {
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std::map<int, char *>::iterator i;
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i = MacTable.find(prefix);
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if (i == MacTable.end())
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return NULL;
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return i->second;
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}
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/* Takes a three byte MAC address prefix (passing the whole MAC is OK
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too) and returns the company which has registered the prefix.
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NULL is returned if no vendor is found for the given prefix or if there
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is some other error. */
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const char *MACPrefix2Corp(const u8 *prefix) {
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if (!prefix) fatal("%s called with a NULL prefix", __func__);
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mac_prefix_init();
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return findMACEntry(MacCharPrefix2Key(prefix));
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}
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/* Takes a string and looks through the table for a vendor name which
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contains that string. Sets the first three bytes in mac_data and
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returns true for the first matching entry found. If no entries
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match, leaves mac_data untouched and returns false. Note that this
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is not particularly efficient and so should be rewritten if it is
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called often */
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bool MACCorp2Prefix(const char *vendorstr, u8 *mac_data) {
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std::map<int, char *>::iterator i;
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if (!vendorstr) fatal("%s: vendorstr is NULL", __func__);
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if (!mac_data) fatal("%s: mac_data is NULL", __func__);
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mac_prefix_init();
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for (i = MacTable.begin(); i != MacTable.end(); i++) {
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if (strcasestr(i->second, vendorstr)) {
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mac_data[0] = i->first >> 16;
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mac_data[1] = (i->first >> 8) & 0xFF;
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mac_data[2] = i->first & 0xFF;
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return true;
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}
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}
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return false;
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}
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