/
main.c
1853 lines (1584 loc) · 64.2 KB
/
main.c
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/*
main
This includes:
* main()
* transmit_thread() - transmits probe packets
* receive_thread() - receives response packets
You'll be wanting to study the transmit/receive threads, because that's
where all the action is.
This is the lynch-pin of the entire program, so it includes a heckuva lot
of headers, and the functions have a lot of local variables. I'm trying
to make this file relative "flat" this way so that everything is visible.
*/
#include "masscan.h"
#include "masscan-version.h"
#include "masscan-status.h" /* open or closed */
#include "rand-blackrock.h" /* the BlackRock shuffling func */
#include "rand-lcg.h" /* the LCG randomization func */
#include "templ-pkt.h" /* packet template, that we use to send */
#include "rawsock.h" /* API on top of Linux, Windows, Mac OS X*/
#include "logger.h" /* adjust with -v command-line opt */
#include "main-status.h" /* printf() regular status updates */
#include "main-throttle.h" /* rate limit */
#include "main-dedup.h" /* ignore duplicate responses */
#include "main-ptrace.h" /* for nmap --packet-trace feature */
#include "proto-arp.h" /* for responding to ARP requests */
#include "stack-ndpv6.h" /* IPv6 Neighbor Discovery Protocol */
#include "stack-arpv4.h" /* Handle ARP resolution and requests */
#include "rawsock-adapter.h"
#include "proto-banner1.h" /* for snatching banners from systems */
#include "proto-tcp.h" /* for TCP/IP connection table */
#include "proto-preprocess.h" /* quick parse of packets */
#include "proto-icmp.h" /* handle ICMP responses */
#include "proto-udp.h" /* handle UDP responses */
#include "syn-cookie.h" /* for SYN-cookies on send */
#include "output.h" /* for outputting results */
#include "rte-ring.h" /* producer/consumer ring buffer */
#include "rawsock-pcapfile.h" /* for saving pcap files w/ raw packets */
#include "stub-pcap.h" /* dynamically load libpcap library */
#include "smack.h" /* Aho-corasick state-machine pattern-matcher */
#include "pixie-timer.h" /* portable time functions */
#include "pixie-threads.h" /* portable threads */
#include "templ-payloads.h" /* UDP packet payloads */
#include "proto-snmp.h" /* parse SNMP responses */
#include "proto-ntp.h" /* parse NTP responses */
#include "proto-coap.h" /* CoAP selftest */
#include "in-binary.h" /* convert binary output to XML/JSON */
#include "main-globals.h" /* all the global variables in the program */
#include "proto-zeroaccess.h"
#include "siphash24.h"
#include "proto-x509.h"
#include "crypto-base64.h" /* base64 encode/decode */
#include "pixie-backtrace.h"
#include "proto-sctp.h"
#include "proto-oproto.h" /* Other protocols on top of IP */
#include "vulncheck.h" /* checking vulns like monlist, poodle, heartblee */
#include "main-readrange.h"
#include "scripting.h"
#include "read-service-probes.h"
#include "misc-rstfilter.h"
#include "util-malloc.h"
#include "util-checksum.h"
#include "massip-parse.h"
#include "massip-port.h"
#include <assert.h>
#include <limits.h>
#include <string.h>
#include <time.h>
#include <stdlib.h>
#include <signal.h>
#include <stdint.h>
#if defined(WIN32)
#include <WinSock.h>
#if defined(_MSC_VER)
#pragma comment(lib, "Ws2_32.lib")
#endif
#else
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#endif
/*
* yea I know globals suck
*/
unsigned volatile is_tx_done = 0;
unsigned volatile is_rx_done = 0;
time_t global_now;
uint64_t usec_start;
/***************************************************************************
* We create a pair of transmit/receive threads for each network adapter.
* This structure contains the parameters we send to each pair.
***************************************************************************/
struct ThreadPair {
/** This points to the central configuration. Note that it's 'const',
* meaning that the thread cannot change the contents. That'd be
* unsafe */
const struct Masscan *masscan;
/** The adapter used by the thread-pair. Normally, thread-pairs have
* their own network adapter, especially when doing PF_RING
* clustering. */
struct Adapter *adapter;
struct stack_t *stack;
/**
* The index of the network adapter that we are using for this
* thread-pair. This is an index into the "masscan->nic[]"
* array.
*
* NOTE: this is also the "thread-id", because we create one
* transmit/receive thread pair per NIC.
*/
unsigned nic_index;
/**
* A copy of the master 'index' variable. This is just advisory for
* other threads, to tell them how far we've gotten.
*/
volatile uint64_t my_index;
/* This is used both by the transmit and receive thread for
* formatting packets */
struct TemplateSet tmplset[1];
/**
* The current IP address we are using for transmit/receive.
*/
struct stack_src_t _src_;
macaddress_t source_mac;
macaddress_t router_mac_ipv4;
macaddress_t router_mac_ipv6;
unsigned done_transmitting;
unsigned done_receiving;
double pt_start;
struct Throttler throttler[1];
uint64_t *total_synacks;
uint64_t *total_tcbs;
uint64_t *total_syns;
size_t thread_handle_xmit;
size_t thread_handle_recv;
};
/***************************************************************************
* We support a range of source IP/port. This function converts that
* range into useful variables we can use to pick things form that range.
***************************************************************************/
static void
adapter_get_source_addresses(const struct Masscan *masscan,
unsigned nic_index,
unsigned *src_ipv4,
unsigned *src_ipv4_mask,
unsigned *src_port,
unsigned *src_port_mask,
ipv6address *src_ipv6,
ipv6address *src_ipv6_mask)
{
const struct stack_src_t *src = &masscan->nic[nic_index].src;
static ipv6address mask = {~0ULL, ~0ULL};
*src_ipv4 = src->ipv4.first;
*src_ipv4_mask = src->ipv4.last - src->ipv4.first;
*src_port = src->port.first;
*src_port_mask = src->port.last - src->port.first;
*src_ipv6 = src->ipv6.first;
/* TODO: currently supports only a single address. This needs to
* be fixed to support a list of addresses */
*src_ipv6_mask = mask;
}
/***************************************************************************
* This thread spews packets as fast as it can
*
* THIS IS WHERE ALL THE EXCITEMENT HAPPENS!!!!
* 90% of CPU cycles are in the function.
*
***************************************************************************/
static void
transmit_thread(void *v) /*aka. scanning_thread() */
{
struct ThreadPair *parms = (struct ThreadPair *)v;
uint64_t i;
uint64_t start;
uint64_t end;
const struct Masscan *masscan = parms->masscan;
uint64_t retries = masscan->retries;
uint64_t rate = (uint64_t)masscan->max_rate;
unsigned r = (unsigned)retries + 1;
uint64_t range;
uint64_t range_ipv6;
struct BlackRock blackrock;
uint64_t count_ipv4 = rangelist_count(&masscan->targets.ipv4);
uint64_t count_ipv6 = range6list_count(&masscan->targets.ipv6).lo;
struct Throttler *throttler = parms->throttler;
struct TemplateSet pkt_template = templ_copy(parms->tmplset);
struct Adapter *adapter = parms->adapter;
uint64_t packets_sent = 0;
unsigned increment = (masscan->shard.of-1) + masscan->nic_count;
unsigned src_ipv4;
unsigned src_ipv4_mask;
unsigned src_port;
unsigned src_port_mask;
ipv6address src_ipv6;
ipv6address src_ipv6_mask;
uint64_t seed = masscan->seed;
uint64_t repeats = 0; /* --infinite repeats */
uint64_t *status_syn_count;
uint64_t entropy = masscan->seed;
LOG(1, "[+] starting transmit thread #%u\n", parms->nic_index);
/* export a pointer to this variable outside this threads so
* that the 'status' system can print the rate of syns we are
* sending */
status_syn_count = MALLOC(sizeof(uint64_t));
*status_syn_count = 0;
parms->total_syns = status_syn_count;
/* Normally, we have just one source address. In special cases, though
* we can have multiple. */
adapter_get_source_addresses(masscan, parms->nic_index,
&src_ipv4, &src_ipv4_mask,
&src_port, &src_port_mask,
&src_ipv6, &src_ipv6_mask);
/* "THROTTLER" rate-limits how fast we transmit, set with the
* --max-rate parameter */
throttler_start(throttler, masscan->max_rate/masscan->nic_count);
infinite:
/* Create the shuffler/randomizer. This creates the 'range' variable,
* which is simply the number of IP addresses times the number of
* ports.
* IPv6: low index will pick addresses from the IPv6 ranges, and high
* indexes will pick addresses from the IPv4 ranges. */
range = count_ipv4 * rangelist_count(&masscan->targets.ports)
+ count_ipv6 * rangelist_count(&masscan->targets.ports);
range_ipv6 = count_ipv6 * rangelist_count(&masscan->targets.ports);
blackrock_init(&blackrock, range, seed, masscan->blackrock_rounds);
/* Calculate the 'start' and 'end' of a scan. One reason to do this is
* to support --shard, so that multiple machines can co-operate on
* the same scan. Another reason to do this is so that we can bleed
* a little bit past the end when we have --retries. Yet another
* thing to do here is deal with multiple network adapters, which
* is essentially the same logic as shards. */
start = masscan->resume.index + (masscan->shard.one-1) + parms->nic_index;
end = range;
if (masscan->resume.count && end > start + masscan->resume.count)
end = start + masscan->resume.count;
end += retries * range;
/* -----------------
* the main loop
* -----------------*/
LOG(3, "THREAD: xmit: starting main loop: [%llu..%llu]\n", start, end);
for (i=start; i<end; ) {
uint64_t batch_size;
/*
* Do a batch of many packets at a time. That because per-packet
* throttling is expensive at 10-million pps, so we reduce the
* per-packet cost by doing batches. At slower rates, the batch
* size will always be one. (--max-rate)
*/
batch_size = throttler_next_batch(throttler, packets_sent);
/*
* Transmit packets from other thread, when doing --banners. This
* takes priority over sending SYN packets. If there is so much
* activity grabbing banners that we cannot transmit more SYN packets,
* then "batch_size" will get decremented to zero, and we won't be
* able to transmit SYN packets.
*/
stack_flush_packets(parms->stack, adapter,
&packets_sent, &batch_size);
/*
* Transmit a bunch of packets. At any rate slower than 100,000
* packets/second, the 'batch_size' is likely to be 1. At higher
* rates, we can't afford to throttle on a per-packet basis and
* instead throttle on a per-batch basis. In other words, throttle
* based on 2-at-a-time, 3-at-time, and so on, with the batch
* size increasing as the packet rate increases. This gives us
* very precise packet-timing for low rates below 100,000 pps,
* while not incurring the overhead for high packet rates.
*/
while (batch_size && i < end) {
uint64_t xXx;
uint64_t cookie;
/*
* RANDOMIZE THE TARGET:
* This is kinda a tricky bit that picks a random IP and port
* number in order to scan. We monotonically increment the
* index 'i' from [0..range]. We then shuffle (randomly transmog)
* that index into some other, but unique/1-to-1, number in the
* same range. That way we visit all targets, but in a random
* order. Then, once we've shuffled the index, we "pick" the
* IP address and port that the index refers to.
*/
xXx = (i + (r--) * rate);
if (rate > range)
xXx %= range;
else
while (xXx >= range)
xXx -= range;
xXx = blackrock_shuffle(&blackrock, xXx);
if (xXx < range_ipv6) {
ipv6address ip_them;
unsigned port_them;
ipv6address ip_me;
unsigned port_me;
ip_them = range6list_pick(&masscan->targets.ipv6, xXx % count_ipv6);
port_them = rangelist_pick(&masscan->targets.ports, xXx / count_ipv6);
ip_me = src_ipv6;
port_me = src_port;
cookie = syn_cookie_ipv6(ip_them, port_them, ip_me, port_me, entropy);
rawsock_send_probe_ipv6(
adapter,
ip_them, port_them,
ip_me, port_me,
(unsigned)cookie,
!batch_size, /* flush queue on last packet in batch */
&pkt_template
);
/* Our index selects an IPv6 target */
} else {
/* Our index selects an IPv4 target. In other words, low numbers
* index into the IPv6 ranges, and high numbers index into the
* IPv4 ranges. */
ipv4address ip_them;
ipv4address port_them;
unsigned ip_me;
unsigned port_me;
xXx -= range_ipv6;
ip_them = rangelist_pick(&masscan->targets.ipv4, xXx % count_ipv4);
port_them = rangelist_pick(&masscan->targets.ports, xXx / count_ipv4);
/*
* SYN-COOKIE LOGIC
* Figure out the source IP/port, and the SYN cookie
*/
if (src_ipv4_mask > 1 || src_port_mask > 1) {
uint64_t ck = syn_cookie_ipv4((unsigned)(i+repeats),
(unsigned)((i+repeats)>>32),
(unsigned)xXx, (unsigned)(xXx>>32),
entropy);
port_me = src_port + (ck & src_port_mask);
ip_me = src_ipv4 + ((ck>>16) & src_ipv4_mask);
} else {
ip_me = src_ipv4;
port_me = src_port;
}
cookie = syn_cookie_ipv4(ip_them, port_them, ip_me, port_me, entropy);
/*
* SEND THE PROBE
* This is sorta the entire point of the program, but little
* exciting happens here. The thing to note that this may
* be a "raw" transmit that bypasses the kernel, meaning
* we can call this function millions of times a second.
*/
rawsock_send_probe_ipv4(
adapter,
ip_them, port_them,
ip_me, port_me,
(unsigned)cookie,
!batch_size, /* flush queue on last packet in batch */
&pkt_template
);
}
batch_size--;
packets_sent++;
(*status_syn_count)++;
/*
* SEQUENTIALLY INCREMENT THROUGH THE RANGE
* Yea, I know this is a puny 'i++' here, but it's a core feature
* of the system that is linearly increments through the range,
* but produces from that a shuffled sequence of targets (as
* described above). Because we are linearly incrementing this
* number, we can do lots of creative stuff, like doing clever
* retransmits and sharding.
*/
if (r == 0) {
i += increment; /* <------ increment by 1 normally, more with shards/nics */
r = (unsigned)retries + 1;
}
} /* end of batch */
/* save our current location for resuming, if the user pressed
* <ctrl-c> to exit early */
parms->my_index = i;
/* If the user pressed <ctrl-c>, then we need to exit. In case
* the user wants to --resume the scan later, we save the current
* state in a file */
if (is_tx_done) {
break;
}
}
/*
* --infinite
* For load testing, go around and do this again
*/
if (masscan->is_infinite && !is_tx_done) {
seed++;
repeats++;
goto infinite;
}
/*
* Flush any untransmitted packets. High-speed mechanisms like Windows
* "sendq" and Linux's "PF_RING" queue packets and transmit many together,
* so there may be some packets that we've queued but not yet transmitted.
* This call makes sure they are transmitted.
*/
rawsock_flush(adapter);
/*
* Wait until the receive thread realizes the scan is over
*/
LOG(1, "[+] transmit thread #%u complete\n", parms->nic_index);
/*
* We are done transmitting. However, response packets will take several
* seconds to arrive. Therefore, sit in short loop waiting for those
* packets to arrive. Pressing <ctrl-c> a second time will exit this
* prematurely.
*/
while (!is_rx_done) {
unsigned k;
uint64_t batch_size;
for (k=0; k<1000; k++) {
/*
* Only send a few packets at a time, throttled according to the max
* --max-rate set by the user
*/
batch_size = throttler_next_batch(throttler, packets_sent);
/* Transmit packets from the receive thread */
stack_flush_packets( parms->stack, adapter,
&packets_sent,
&batch_size);
/* Make sure they've actually been transmitted, not just queued up for
* transmit */
rawsock_flush(adapter);
pixie_usleep(100);
}
}
/* Thread is about to exit */
parms->done_transmitting = 1;
LOG(1, "[+] exiting transmit thread #%u \n", parms->nic_index);
}
/***************************************************************************
***************************************************************************/
static unsigned
is_nic_port(const struct Masscan *masscan, unsigned ip)
{
unsigned i;
for (i=0; i<masscan->nic_count; i++)
if (is_my_port(&masscan->nic[i].src, ip))
return 1;
return 0;
}
static unsigned
is_ipv6_multicast(ipaddress ip_me)
{
/* If this is an IPv6 multicast packet, one sent to the IPv6
* address with a prefix of FF02::/16 */
return ip_me.version == 6 && (ip_me.ipv6.hi>>48ULL) == 0xFF02;
}
/***************************************************************************
*
* Asynchronous receive thread
*
* The transmit and receive threads run independently of each other. There
* is no record what was transmitted. Instead, the transmit thread sets a
* "SYN-cookie" in transmitted packets, which the receive thread will then
* use to match up requests with responses.
***************************************************************************/
static void
receive_thread(void *v)
{
struct ThreadPair *parms = (struct ThreadPair *)v;
const struct Masscan *masscan = parms->masscan;
struct Adapter *adapter = parms->adapter;
int data_link = stack_if_datalink(adapter);
struct Output *out;
struct DedupTable *dedup;
struct PcapFile *pcapfile = NULL;
struct TCP_ConnectionTable *tcpcon = 0;
uint64_t *status_synack_count;
uint64_t *status_tcb_count;
uint64_t entropy = masscan->seed;
struct ResetFilter *rf;
struct stack_t *stack = parms->stack;
/* For reducing RST responses, see rstfilter_is_filter() below */
rf = rstfilter_create(entropy, 16384);
/* some status variables */
status_synack_count = MALLOC(sizeof(uint64_t));
*status_synack_count = 0;
parms->total_synacks = status_synack_count;
status_tcb_count = MALLOC(sizeof(uint64_t));
*status_tcb_count = 0;
parms->total_tcbs = status_tcb_count;
LOG(1, "[+] starting receive thread #%u\n", parms->nic_index);
/* Lock this thread to a CPU. Transmit threads are on even CPUs,
* receive threads on odd CPUs */
if (pixie_cpu_get_count() > 1) {
unsigned cpu_count = pixie_cpu_get_count();
unsigned cpu = parms->nic_index * 2 + 1;
while (cpu >= cpu_count) {
cpu -= cpu_count;
cpu++;
}
//TODO:
//pixie_cpu_set_affinity(cpu);
}
/*
* If configured, open a --pcap file for saving raw packets. This is
* so that we can debug scans, but also so that we can look at the
* strange things people send us. Note that we don't record transmitted
* packets, just the packets we've received.
*/
if (masscan->pcap_filename[0]) {
pcapfile = pcapfile_openwrite(masscan->pcap_filename, 1);
}
/*
* Open output. This is where results are reported when saving
* the --output-format to the --output-filename
*/
out = output_create(masscan, parms->nic_index);
/*
* Create deduplication table. This is so when somebody sends us
* multiple responses, we only record the first one.
*/
dedup = dedup_create();
/*
* Create a TCP connection table (per thread pair) for interacting with live
* connections when doing --banners
*/
if (masscan->is_banners) {
struct TcpCfgPayloads *pay;
size_t i;
/*
* Create TCP connection table
*/
tcpcon = tcpcon_create_table(
(size_t)((masscan->max_rate/5) / masscan->nic_count),
parms->stack,
&parms->tmplset->pkts[Proto_TCP],
output_report_banner,
out,
masscan->tcb.timeout,
masscan->seed
);
/*
* Initialize TCP scripting
*/
scripting_init_tcp(tcpcon, masscan->scripting.L);
/*
* Set some flags [kludge]
*/
tcpcon_set_banner_flags(tcpcon,
masscan->is_capture_cert,
masscan->is_capture_servername,
masscan->is_capture_html,
masscan->is_capture_heartbleed,
masscan->is_capture_ticketbleed);
if (masscan->is_hello_smbv1)
tcpcon_set_parameter(tcpcon, "hello", 1, "smbv1");
if (masscan->is_hello_http)
tcpcon_set_parameter(tcpcon, "hello", 1, "http");
if (masscan->is_hello_ssl)
tcpcon_set_parameter(tcpcon, "hello", 1, "ssl");
if (masscan->is_heartbleed)
tcpcon_set_parameter(tcpcon, "heartbleed", 1, "1");
if (masscan->is_ticketbleed)
tcpcon_set_parameter(tcpcon, "ticketbleed", 1, "1");
if (masscan->is_poodle_sslv3)
tcpcon_set_parameter(tcpcon, "sslv3", 1, "1");
if (masscan->http.payload)
tcpcon_set_parameter( tcpcon,
"http-payload",
masscan->http.payload_length,
masscan->http.payload);
if (masscan->http.user_agent)
tcpcon_set_parameter( tcpcon,
"http-user-agent",
masscan->http.user_agent_length,
masscan->http.user_agent);
if (masscan->http.host)
tcpcon_set_parameter( tcpcon,
"http-host",
masscan->http.host_length,
masscan->http.host);
if (masscan->http.method)
tcpcon_set_parameter( tcpcon,
"http-method",
masscan->http.method_length,
masscan->http.method);
if (masscan->http.url)
tcpcon_set_parameter( tcpcon,
"http-url",
masscan->http.url_length,
masscan->http.url);
if (masscan->http.version)
tcpcon_set_parameter( tcpcon,
"http-version",
masscan->http.version_length,
masscan->http.version);
if (masscan->tcp_connection_timeout) {
char foo[64];
sprintf_s(foo, sizeof(foo), "%u", masscan->tcp_connection_timeout);
tcpcon_set_parameter( tcpcon,
"timeout",
strlen(foo),
foo);
}
if (masscan->tcp_hello_timeout) {
char foo[64];
sprintf_s(foo, sizeof(foo), "%u", masscan->tcp_hello_timeout);
tcpcon_set_parameter( tcpcon,
"hello-timeout",
strlen(foo),
foo);
}
for (i=0; i<masscan->http.headers_count; i++) {
tcpcon_set_http_header(tcpcon,
masscan->http.headers[i].name,
masscan->http.headers[i].value_length,
masscan->http.headers[i].value,
http_field_replace);
}
for (i=0; i<masscan->http.cookies_count; i++) {
tcpcon_set_http_header(tcpcon,
"Cookie",
masscan->http.cookies[i].value_length,
masscan->http.cookies[i].value,
http_field_add);
}
for (i=0; i<masscan->http.remove_count; i++) {
tcpcon_set_http_header(tcpcon,
masscan->http.headers[i].name,
0,
0,
http_field_remove);
}
for (pay = masscan->payloads.tcp; pay; pay = pay->next) {
char name[64];
sprintf_s(name, sizeof(name), "hello-string[%u]", pay->port);
tcpcon_set_parameter( tcpcon,
name,
strlen(pay->payload_base64),
pay->payload_base64);
}
}
/*
* In "offline" mode, we don't have any receive threads, so simply
* wait until transmitter thread is done then go to the end
*/
if (masscan->is_offline) {
while (!is_rx_done)
pixie_usleep(10000);
parms->done_receiving = 1;
goto end;
}
/*
* Receive packets. This is where we catch any responses and print
* them to the terminal.
*/
LOG(2, "[+] THREAD: recv: starting main loop\n");
while (!is_rx_done) {
int status;
unsigned length;
unsigned secs;
unsigned usecs;
const unsigned char *px;
int err;
unsigned x;
struct PreprocessedInfo parsed;
ipaddress ip_me;
unsigned port_me;
ipaddress ip_them;
unsigned port_them;
unsigned seqno_me;
unsigned seqno_them;
unsigned cookie;
unsigned Q = 0;
/*
* RECEIVE
*
* This is the boring part of actually receiving a packet
*/
err = rawsock_recv_packet(
adapter,
&length,
&secs,
&usecs,
&px);
if (err != 0) {
if (tcpcon)
tcpcon_timeouts(tcpcon, (unsigned)time(0), 0);
continue;
}
/*
* Do any TCP event timeouts based on the current timestamp from
* the packet. For example, if the connection has been open for
* around 10 seconds, we'll close the connection. (--banners)
*/
if (tcpcon) {
tcpcon_timeouts(tcpcon, secs, usecs);
}
if (length > 1514)
continue;
/*
* "Preprocess" the response packet. This means to go through and
* figure out where the TCP/IP headers are and the locations of
* some fields, like IP address and port numbers.
*/
x = preprocess_frame(px, length, data_link, &parsed);
if (!x)
continue; /* corrupt packet */
ip_me = parsed.dst_ip;
ip_them = parsed.src_ip;
port_me = parsed.port_dst;
port_them = parsed.port_src;
seqno_them = TCP_SEQNO(px, parsed.transport_offset);
seqno_me = TCP_ACKNO(px, parsed.transport_offset);
assert(ip_me.version != 0);
assert(ip_them.version != 0);
switch (parsed.ip_protocol) {
case 132: /* SCTP */
cookie = syn_cookie(ip_them, port_them | (Proto_SCTP<<16), ip_me, port_me, entropy) & 0xFFFFFFFF;
break;
default:
cookie = syn_cookie(ip_them, port_them, ip_me, port_me, entropy) & 0xFFFFFFFF;
}
/* verify: my IP address */
if (!is_my_ip(stack->src, ip_me)) {
/* NDP Neighbor Solicitations don't come to our IP address, but to
* a multicast address */
if (is_ipv6_multicast(ip_me)) {
if (parsed.found == FOUND_NDPv6 && parsed.opcode == 135) {
stack_ndpv6_incoming_request(stack, &parsed, px, length);
}
}
continue;
}
/*
* Handle non-TCP protocols
*/
switch (parsed.found) {
case FOUND_NDPv6:
switch (parsed.opcode) {
case 133: /* Router Solicitation */
/* Ignore router solicitations, since we aren't a router */
continue;
case 134: /* Router advertisement */
/* TODO: We need to process router advertisements while scanning
* so that we can print warning messages if router information
* changes while scanning. */
continue;
case 135: /* Neighbor Solicitation */
/* When responses come back from our scans, the router will send us
* these packets. We need to respond to them, so that the router
* can then forward the packets to us. If we don't respond, we'll
* get no responses. */
stack_ndpv6_incoming_request(stack, &parsed, px, length);
continue;
case 136: /* Neighbor Advertisement */
/* TODO: If doing an --ndpscan, the scanner subsystem needs to deal
* with these */
continue;
case 137: /* Redirect */
/* We ignore these, since we really don't have the capability to send
* packets to one router for some destinations and to another router
* for other destinations */
continue;
default:
break;
}
continue;
case FOUND_ARP:
LOGip(2, ip_them, 0, "-> ARP [%u] \n", px[parsed.found_offset]);
switch (parsed.opcode) {
case 1: /* request */
/* This function will transmit a "reply" to somebody's ARP request
* for our IP address (as part of our user-mode TCP/IP).
* Since we completely bypass the TCP/IP stack, we have to handle ARPs
* ourself, or the router will lose track of us.*/
stack_arp_incoming_request(stack,
ip_me.ipv4,
parms->source_mac,
px, length);
break;
case 2: /* response */
/* This is for "arp scan" mode, where we are ARPing targets rather
* than port scanning them */
/* If we aren't doing an ARP scan, then ignore ARP responses */
if (!masscan->scan_type.arp)
break;
/* If this response isn't in our range, then ignore it */
if (!rangelist_is_contains(&masscan->targets.ipv4, ip_them.ipv4))
break;
/* Ignore duplicates */
if (dedup_is_duplicate(dedup, ip_them, 0, ip_me, 0))
continue;
/* ...everything good, so now report this response */
arp_recv_response(out, secs, px, length, &parsed);
break;
}
continue;
case FOUND_UDP:
case FOUND_DNS:
if (!is_nic_port(masscan, port_me))
continue;
if (parms->masscan->nmap.packet_trace)
packet_trace(stdout, parms->pt_start, px, length, 0);
handle_udp(out, secs, px, length, &parsed, entropy);
continue;
case FOUND_ICMP:
handle_icmp(out, secs, px, length, &parsed, entropy);
continue;
case FOUND_SCTP:
handle_sctp(out, secs, px, length, cookie, &parsed, entropy);
break;
case FOUND_OPROTO: /* other IP proto */
handle_oproto(out, secs, px, length, &parsed, entropy);
break;
case FOUND_TCP:
/* fall down to below */
break;
default:
continue;
}
/* verify: my port number */
if (!is_my_port(stack->src, port_me))
continue;
if (parms->masscan->nmap.packet_trace)
packet_trace(stdout, parms->pt_start, px, length, 0);
Q = 0;
/* Save raw packet in --pcap file */
if (pcapfile) {
pcapfile_writeframe(
pcapfile,
px,
length,
length,
secs,
usecs);
}
{
char buf[64];
LOGip(5, ip_them, port_them, "-> TCP ackno=0x%08x flags=0x%02x(%s)\n",
seqno_me,
TCP_FLAGS(px, parsed.transport_offset),
reason_string(TCP_FLAGS(px, parsed.transport_offset), buf, sizeof(buf)));
}
/* If recording --banners, create a new "TCP Control Block (TCB)" */
if (tcpcon) {
struct TCP_Control_Block *tcb;
/* does a TCB already exist for this connection? */
tcb = tcb_lookup(tcpcon,
ip_me, ip_them,
port_me, port_them);
if (TCP_IS_SYNACK(px, parsed.transport_offset)) {
if (cookie != seqno_me - 1) {
ipaddress_formatted_t fmt = ipaddress_fmt(ip_them);
LOG(2, "%s - bad cookie: ackno=0x%08x expected=0x%08x\n",
fmt.string, seqno_me-1, cookie);
continue;
}
if (tcb == NULL) {
tcb = tcpcon_create_tcb(tcpcon,
ip_me, ip_them,
port_me, port_them,
seqno_me, seqno_them+1,
parsed.ip_ttl);
(*status_tcb_count)++;
}
Q += stack_incoming_tcp(tcpcon, tcb, TCP_WHAT_SYNACK,
0, 0, secs, usecs, seqno_them+1);
} else if (tcb) {
/* If this is an ACK, then handle that first */
if (TCP_IS_ACK(px, parsed.transport_offset)) {
Q += stack_incoming_tcp(tcpcon, tcb, TCP_WHAT_ACK,
0, seqno_me, secs, usecs, seqno_them);
}
/* If this contains payload, handle that second */
if (parsed.app_length) {
Q += stack_incoming_tcp(tcpcon, tcb, TCP_WHAT_DATA,
px + parsed.app_offset, parsed.app_length,
secs, usecs, seqno_them);
}