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/***************************************************************************
* payload.cc -- Retrieval of UDP payloads. *
* *
***********************IMPORTANT NMAP LICENSE TERMS************************
*
* The Nmap Security Scanner is (C) 1996-2023 Nmap Software LLC ("The Nmap
* Project"). Nmap is also a registered trademark of the Nmap Project.
*
* This program is distributed under the terms of the Nmap Public Source
* License (NPSL). The exact license text applying to a particular Nmap
* release or source code control revision is contained in the LICENSE
* file distributed with that version of Nmap or source code control
* revision. More Nmap copyright/legal information is available from
* https://nmap.org/book/man-legal.html, and further information on the
* NPSL license itself can be found at https://nmap.org/npsl/ . This
* header summarizes some key points from the Nmap license, but is no
* substitute for the actual license text.
*
* Nmap is generally free for end users to download and use themselves,
* including commercial use. It is available from https://nmap.org.
*
* The Nmap license generally prohibits companies from using and
* redistributing Nmap in commercial products, but we sell a special Nmap
* OEM Edition with a more permissive license and special features for
* this purpose. See https://nmap.org/oem/
*
* If you have received a written Nmap license agreement or contract
* stating terms other than these (such as an Nmap OEM license), you may
* choose to use and redistribute Nmap under those terms instead.
*
* The official Nmap Windows builds include the Npcap software
* (https://npcap.com) for packet capture and transmission. It is under
* separate license terms which forbid redistribution without special
* permission. So the official Nmap Windows builds may not be redistributed
* without special permission (such as an Nmap OEM license).
*
* 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.
*
* Source code also allows you to port Nmap to new platforms, fix bugs, and add
* new features. You are highly encouraged to submit your changes as a Github PR
* or by email to the dev@nmap.org mailing list for possible incorporation into
* the main distribution. Unless you specify otherwise, it is understood that
* you are offering us very broad rights to use your submissions as described in
* the Nmap Public Source License Contributor Agreement. This is important
* because we fund the project by selling licenses with various terms, and also
* because the inability to relicense code has caused devastating problems for
* other Free Software projects (such as KDE and NASM).
*
* The free version of Nmap 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. Warranties,
* indemnification and commercial support are all available through the
* Npcap OEM program--see https://nmap.org/oem/
*
***************************************************************************/
/* $Id$ */
#include "nmap.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string>
#include <map>
#include "NmapOps.h"
#include "nbase.h"
#include "payload.h"
#include "utils.h"
#include "nmap_error.h"
#include "scan_lists.h"
#include "service_scan.h"
extern NmapOps o;
/* The key for the payload lookup map is u16 dport. We can make it a u32 and
* add proto later if needed. */
static std::map<u16, std::vector<ServiceProbe *> > portPayloads;
void init_payloads(void) {
static bool payloads_loaded = false;
if (payloads_loaded)
return;
AllProbes *AP = AllProbes::service_scan_init();
for (std::vector<ServiceProbe *>::const_iterator it = AP->probes.begin();
it != AP->probes.end(); it++) {
ServiceProbe *current_probe = *it;
if (current_probe->getProbeProtocol() == IPPROTO_UDP && !current_probe->notForPayload) {
for (std::vector<u16>::const_iterator pt = current_probe->probablePortsBegin();
pt != current_probe->probablePortsEnd(); pt++) {
std::vector<ServiceProbe *> &portPayloadVector = portPayloads[*pt];
portPayloadVector.push_back(current_probe);
if (portPayloadVector.size() > MAX_PAYLOADS_PER_PORT) {
fatal("Number of UDP payloads for port %u exceeds the limit of %u.\n", *pt, MAX_PAYLOADS_PER_PORT);
}
}
}
}
payloads_loaded = true;
}
/* Get a payload appropriate for the given UDP port. For certain selected ports
a payload is returned, and for others a zero-length payload is returned. The
length is returned through the length pointer. */
static const u8 *udp_port2payload(u16 dport, int *length, u8 index) {
const u8 *payload = NULL;
std::map<u16, std::vector<ServiceProbe *> >::const_iterator portPayloadIterator;
int portPayloadVectorSize;
*length = 0;
portPayloadIterator = portPayloads.find(dport);
if (portPayloadIterator != portPayloads.end()) {
const std::vector<ServiceProbe *>& portPayloadVector = portPayloadIterator->second;
portPayloadVectorSize = portPayloadVector.size();
assert(portPayloadVectorSize > 0);
const ServiceProbe *SP = portPayloadVector[index % portPayloadVectorSize];
payload = SP->getProbeString(length);
}
return payload;
}
/* Get a payload appropriate for the given UDP port. If --data-length was used,
returns the global random payload. Otherwise, for certain selected ports a
payload is returned, and for others a zero-length payload is returned. The
length is returned through the length pointer. */
const u8 *get_udp_payload(u16 dport, int *length, u8 index) {
if (o.extra_payload != NULL) {
*length = o.extra_payload_length;
return (u8 *) o.extra_payload;
} else {
return udp_port2payload(dport, length, index);
}
}
u8 udp_payload_count(u16 dport) {
std::map<u16, std::vector<ServiceProbe *> >::const_iterator portPayloadIterator;
size_t portPayloadVectorSize = 0;
portPayloadIterator = portPayloads.find(dport);
if (portPayloadIterator != portPayloads.end()) {
portPayloadVectorSize = portPayloadIterator->second.size();
}
return portPayloadVectorSize;
}
const struct MatchDetails *payload_service_match(u16 dport, const u8 *buf, int buflen) {
std::map<u16, std::vector<ServiceProbe *> >::const_iterator portPayloadIterator;
portPayloadIterator = portPayloads.find(dport);
if (portPayloadIterator != portPayloads.end()) {
const std::vector<ServiceProbe *>& portPayloadVector = portPayloadIterator->second;
// We don't know which payload triggered this, since we send all at once
// with the same source port.
for (std::vector<ServiceProbe *>::const_iterator sp = portPayloadVector.begin();
sp != portPayloadVector.end(); sp++) {
ServiceProbe *probe = *sp;
const struct MatchDetails *MD = NULL;
for (int fb = 0; probe->fallbacks[fb] != NULL; fb++) {
MD = probe->fallbacks[fb]->testMatch(buf, buflen, 0);
if (MD)
return MD;
}
}
}
return NULL;
}
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