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217 lines
10 KiB
C++
217 lines
10 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) 1996-2012 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 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 rewriteen 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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