#ifndef WIN32
#include <arpa/inet.h>
#include <netinet/in.h>
#else
#include <windows.h>
#endif
#include <errno.h>
#include <ndpi_api.h>
#include <ndpi_main.h>
#include <ndpi_typedefs.h>
#include <pcap/pcap.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
//#define VERBOSE 1
#define MAX_FLOW_ROOTS_PER_THREAD 2048
#define MAX_IDLE_FLOWS_PER_THREAD 64
#define TICK_RESOLUTION 1000
#define MAX_READER_THREADS 4
#define IDLE_SCAN_PERIOD 10000 /* msec */
#define MAX_IDLE_TIME 300000 /* msec */
#define INITIAL_THREAD_HASH 0x03dd018b
#ifndef ETH_P_IP
#define ETH_P_IP 0x0800
#endif
#ifndef ETH_P_IPV6
#define ETH_P_IPV6 0x86DD
#endif
#ifndef ETH_P_ARP
#define ETH_P_ARP 0x0806
#endif
enum nDPI_l3_type {
L3_IP, L3_IP6
};
struct nDPI_flow_info {
uint32_t flow_id;
unsigned long long int packets_processed;
uint64_t first_seen;
uint64_t last_seen;
uint64_t hashval;
enum nDPI_l3_type l3_type;
union {
struct {
uint32_t src;
uint32_t pad_00[3];
uint32_t dst;
uint32_t pad_01[3];
} v4;
struct {
uint64_t src[2];
uint64_t dst[2];
} v6;
struct {
uint32_t src[4];
uint32_t dst[4];
} u32;
} ip_tuple;
unsigned long long int total_l4_data_len;
uint16_t src_port;
uint16_t dst_port;
uint8_t is_midstream_flow:1;
uint8_t flow_fin_ack_seen:1;
uint8_t flow_ack_seen:1;
uint8_t detection_completed:1;
uint8_t tls_client_hello_seen:1;
uint8_t tls_server_hello_seen:1;
uint8_t flow_info_printed:1;
uint8_t reserved_00:1;
uint8_t l4_protocol;
struct ndpi_proto detected_l7_protocol;
struct ndpi_proto guessed_protocol;
struct ndpi_flow_struct * ndpi_flow;
};
struct nDPI_workflow {
pcap_t * pcap_handle;
uint8_t error_or_eof;
unsigned long long int packets_captured;
unsigned long long int packets_processed;
unsigned long long int total_l4_data_len;
unsigned long long int detected_flow_protocols;
uint64_t last_idle_scan_time;
uint64_t last_time;
void ** ndpi_flows_active;
unsigned long long int max_active_flows;
unsigned long long int cur_active_flows;
unsigned long long int total_active_flows;
void ** ndpi_flows_idle;
unsigned long long int max_idle_flows;
unsigned long long int cur_idle_flows;
unsigned long long int total_idle_flows;
struct ndpi_detection_module_struct * ndpi_struct;
};
struct nDPI_reader_thread {
struct nDPI_workflow * workflow;
pthread_t thread_id;
int array_index;
};
static struct nDPI_reader_thread reader_threads[MAX_READER_THREADS] = {};
static int reader_thread_count = MAX_READER_THREADS;
static int main_thread_shutdown = 0;
static uint32_t flow_id = 0;
static void free_workflow(struct nDPI_workflow ** const workflow);
static struct nDPI_workflow * init_workflow(char const * const file_or_device)
{
char pcap_error_buffer[PCAP_ERRBUF_SIZE];
struct nDPI_workflow * workflow = (struct nDPI_workflow *)ndpi_calloc(1, sizeof(*workflow));
if (workflow == NULL) {
return NULL;
}
if (access(file_or_device, R_OK) != 0 && errno == ENOENT) {
workflow->pcap_handle = pcap_open_live(file_or_device, /* 1536 */ 65535, 1, 250, pcap_error_buffer);
} else {
#ifdef WIN32
workflow->pcap_handle = pcap_open_offline(file_or_device, pcap_error_buffer);
#else
workflow->pcap_handle = pcap_open_offline_with_tstamp_precision(file_or_device, PCAP_TSTAMP_PRECISION_MICRO,
pcap_error_buffer);
#endif
}
if (workflow->pcap_handle == NULL) {
fprintf(stderr, "pcap_open_live / pcap_open_offline: %.*s\n",
(int) PCAP_ERRBUF_SIZE, pcap_error_buffer);
free_workflow(&workflow);
return NULL;
}
ndpi_init_prefs init_prefs = ndpi_no_prefs;
workflow->ndpi_struct = ndpi_init_detection_module(init_prefs);
if (workflow->ndpi_struct == NULL) {
free_workflow(&workflow);
return NULL;
}
workflow->total_active_flows = 0;
workflow->max_active_flows = MAX_FLOW_ROOTS_PER_THREAD;
workflow->ndpi_flows_active = (void **)ndpi_calloc(workflow->max_active_flows, sizeof(void *));
if (workflow->ndpi_flows_active == NULL) {
free_workflow(&workflow);
return NULL;
}
workflow->total_idle_flows = 0;
workflow->max_idle_flows = MAX_IDLE_FLOWS_PER_THREAD;
workflow->ndpi_flows_idle = (void **)ndpi_calloc(workflow->max_idle_flows, sizeof(void *));
if (workflow->ndpi_flows_idle == NULL) {
free_workflow(&workflow);
return NULL;
}
NDPI_PROTOCOL_BITMASK protos;
NDPI_BITMASK_SET_ALL(protos);
ndpi_set_protocol_detection_bitmask2(workflow->ndpi_struct, &protos);
ndpi_finalize_initialization(workflow->ndpi_struct);
return workflow;
}
static void ndpi_flow_info_freer(void * const node)
{
struct nDPI_flow_info * const flow = (struct nDPI_flow_info *)node;
ndpi_flow_free(flow->ndpi_flow);
ndpi_free(flow);
}
static void free_workflow(struct nDPI_workflow ** const workflow)
{
struct nDPI_workflow * const w = *workflow;
if (w == NULL) {
return;
}
if (w->pcap_handle != NULL) {
pcap_close(w->pcap_handle);
w->pcap_handle = NULL;
}
if (w->ndpi_struct != NULL) {
ndpi_exit_detection_module(w->ndpi_struct);
}
for(size_t i = 0; i < w->max_active_flows; i++) {
ndpi_tdestroy(w->ndpi_flows_active[i], ndpi_flow_info_freer);
}
ndpi_free(w->ndpi_flows_active);
ndpi_free(w->ndpi_flows_idle);
ndpi_free(w);
*workflow = NULL;
}
static char * get_default_pcapdev(char *errbuf)
{
char * ifname;
pcap_if_t * all_devices = NULL;
if (pcap_findalldevs(&all_devices, errbuf) != 0)
{
return NULL;
}
ifname = strdup(all_devices[0].name);
pcap_freealldevs(all_devices);
return ifname;
}
static int setup_reader_threads(char const * const file_or_device)
{
char * file_or_default_device;
char pcap_error_buffer[PCAP_ERRBUF_SIZE];
if (reader_thread_count > MAX_READER_THREADS) {
return 1;
}
if (file_or_device == NULL) {
file_or_default_device = get_default_pcapdev(pcap_error_buffer);
if (file_or_default_device == NULL) {
fprintf(stderr, "pcap_findalldevs: %.*s\n", (int) PCAP_ERRBUF_SIZE, pcap_error_buffer);
return 1;
}
} else {
file_or_default_device = strdup(file_or_device);
if (file_or_default_device == NULL) {
return 1;
}
}
for (int i = 0; i < reader_thread_count; ++i) {
reader_threads[i].workflow = init_workflow(file_or_default_device);
if (reader_threads[i].workflow == NULL)
{
free(file_or_default_device);
return 1;
}
}
free(file_or_default_device);
return 0;
}
static int ip_tuple_to_string(struct nDPI_flow_info const * const flow,
char * const src_addr_str, size_t src_addr_len,
char * const dst_addr_str, size_t dst_addr_len)
{
switch (flow->l3_type) {
case L3_IP:
return inet_ntop(AF_INET, (struct sockaddr_in *)&flow->ip_tuple.v4.src,
src_addr_str, src_addr_len) != NULL &&
inet_ntop(AF_INET, (struct sockaddr_in *)&flow->ip_tuple.v4.dst,
dst_addr_str, dst_addr_len) != NULL;
case L3_IP6:
return inet_ntop(AF_INET6, (struct sockaddr_in6 *)&flow->ip_tuple.v6.src[0],
src_addr_str, src_addr_len) != NULL &&
inet_ntop(AF_INET6, (struct sockaddr_in6 *)&flow->ip_tuple.v6.dst[0],
dst_addr_str, dst_addr_len) != NULL;
}
return 0;
}
#ifdef VERBOSE
static void print_packet_info(struct nDPI_reader_thread const * const reader_thread,
struct pcap_pkthdr const * const header,
uint32_t l4_data_len,
struct nDPI_flow_info const * const flow)
{
struct nDPI_workflow const * const workflow = reader_thread->workflow;
char src_addr_str[INET6_ADDRSTRLEN+1] = {0};
char dst_addr_str[INET6_ADDRSTRLEN+1] = {0};
char buf[256];
int used = 0, ret;
ret = snprintf(buf, sizeof(buf), "[%8llu, %d, %4u] %4u bytes: ",
workflow->packets_captured, reader_thread->array_index,
flow->flow_id, header->caplen);
if (ret > 0) {
used += ret;
}
if (ip_tuple_to_string(flow, src_addr_str, sizeof(src_addr_str), dst_addr_str, sizeof(dst_addr_str)) != 0) {
ret = snprintf(buf + used, sizeof(buf) - used, "IP[%s -> %s]", src_addr_str, dst_addr_str);
} else {
ret = snprintf(buf + used, sizeof(buf) - used, "IP[ERROR]");
}
if (ret > 0) {
used += ret;
}
switch (flow->l4_protocol) {
case IPPROTO_UDP:
ret = snprintf(buf + used, sizeof(buf) - used, " -> UDP[%u -> %u, %u bytes]",
flow->src_port, flow->dst_port, l4_data_len);
break;
case IPPROTO_TCP:
ret = snprintf(buf + used, sizeof(buf) - used, " -> TCP[%u -> %u, %u bytes]",
flow->src_port, flow->dst_port, l4_data_len);
break;
case IPPROTO_ICMP:
ret = snprintf(buf + used, sizeof(buf) - used, " -> ICMP");
break;
case IPPROTO_ICMPV6:
ret = snprintf(buf + used, sizeof(buf) - used, " -> ICMP6");
break;
case IPPROTO_HOPOPTS:
ret = snprintf(buf + used, sizeof(buf) - used, " -> ICMP6 Hop-By-Hop");
break;
default:
ret = snprintf(buf + used, sizeof(buf) - used, " -> Unknown[0x%X]", flow->l4_protocol);
break;
}
if (ret > 0) {
used += ret;
}
printf("%.*s\n", used, buf);
}
#endif
static int ip_tuples_compare(struct nDPI_flow_info const * const A, struct nDPI_flow_info const * const B)
{
// generate a warning if the enum changes
switch (A->l3_type)
{
case L3_IP:
case L3_IP6:
break;
}
if (A->l3_type == L3_IP && B->l3_type == L3_IP)
{
if (A->ip_tuple.v4.src < B->ip_tuple.v4.src)
{
return -1;
}
if (A->ip_tuple.v4.src > B->ip_tuple.v4.src)
{
return 1;
}
if (A->ip_tuple.v4.dst < B->ip_tuple.v4.dst)
{
return -1;
}
if (A->ip_tuple.v4.dst > B->ip_tuple.v4.dst)
{
return 1;
}
}
else if (A->l3_type == L3_IP6 && B->l3_type == L3_IP6)
{
if (A->ip_tuple.v6.src[0] < B->ip_tuple.v6.src[0] && A->ip_tuple.v6.src[1] < B->ip_tuple.v6.src[1])
{
return -1;
}
if (A->ip_tuple.v6.src[0] > B->ip_tuple.v6.src[0] && A->ip_tuple.v6.src[1] > B->ip_tuple.v6.src[1])
{
return 1;
}
if (A->ip_tuple.v6.dst[0] < B->ip_tuple.v6.dst[0] && A->ip_tuple.v6.dst[1] < B->ip_tuple.v6.dst[1])
{
return -1;
}
if (A->ip_tuple.v6.dst[0] > B->ip_tuple.v6.dst[0] && A->ip_tuple.v6.dst[1] > B->ip_tuple.v6.dst[1])
{
return 1;
}
}
if (A->src_port < B->src_port)
{
return -1;
}
if (A->src_port > B->src_port)
{
return 1;
}
if (A->dst_port < B->dst_port)
{
return -1;
}
if (A->dst_port > B->dst_port)
{
return 1;
}
return 0;
}
static void ndpi_idle_scan_walker(void const * const A, ndpi_VISIT which, int depth, void * const user_data)
{
struct nDPI_workflow * const workflow = (struct nDPI_workflow *)user_data;
struct nDPI_flow_info * const flow = *(struct nDPI_flow_info **)A;
(void)depth;
if (workflow == NULL || flow == NULL) {
return;
}
if (workflow->cur_idle_flows == MAX_IDLE_FLOWS_PER_THREAD) {
return;
}
if (which == ndpi_preorder || which == ndpi_leaf) {
if ((flow->flow_fin_ack_seen == 1 && flow->flow_ack_seen == 1) ||
flow->last_seen + MAX_IDLE_TIME < workflow->last_time)
{
char src_addr_str[INET6_ADDRSTRLEN+1];
char dst_addr_str[INET6_ADDRSTRLEN+1];
ip_tuple_to_string(flow, src_addr_str, sizeof(src_addr_str), dst_addr_str, sizeof(dst_addr_str));
workflow->ndpi_flows_idle[workflow->cur_idle_flows++] = flow;
workflow->total_idle_flows++;
}
}
}
static int ndpi_workflow_node_cmp(void const * const A, void const * const B) {
struct nDPI_flow_info const * const flow_info_a = (struct nDPI_flow_info *)A;
struct nDPI_flow_info const * const flow_info_b = (struct nDPI_flow_info *)B;
if (flow_info_a->hashval < flow_info_b->hashval) {
return(-1);
} else if (flow_info_a->hashval > flow_info_b->hashval) {
return(1);
}
/* Flows have the same hash */
if (flow_info_a->l4_protocol < flow_info_b->l4_protocol) {
return(-1);
} else if (flow_info_a->l4_protocol > flow_info_b->l4_protocol) {
return(1);
}
return ip_tuples_compare(flow_info_a, flow_info_b);
}
static void check_for_idle_flows(struct nDPI_workflow * const workflow)
{
if (workflow->last_idle_scan_time + IDLE_SCAN_PERIOD < workflow->last_time) {
for (size_t idle_scan_index = 0; idle_scan_index < workflow->max_active_flows; ++idle_scan_index) {
ndpi_twalk(workflow->ndpi_flows_active[idle_scan_index], ndpi_idle_scan_walker, workflow);
while (workflow->cur_idle_flows > 0) {
struct nDPI_flow_info * const f =
(struct nDPI_flow_info *)workflow->ndpi_flows_idle[--workflow->cur_idle_flows];
if (f->flow_fin_ack_seen == 1) {
printf("Free fin flow with id %u\n", f->flow_id);
} else {
printf("Free idle flow with id %u\n", f->flow_id);
}
ndpi_tdelete(f, &workflow->ndpi_flows_active[idle_scan_index],
ndpi_workflow_node_cmp);
ndpi_flow_info_freer(f);
workflow->cur_active_flows--;
}
}
workflow->last_idle_scan_time = workflow->last_time;
}
}
static void ndpi_process_packet(uint8_t * const args,
struct pcap_pkthdr const * const header,
uint8_t const * const packet)
{
struct nDPI_reader_thread * const reader_thread =
(struct nDPI_reader_thread *)args;
struct nDPI_workflow * workflow;
struct nDPI_flow_info flow = {};
size_t hashed_index;
void * tree_result;
struct nDPI_flow_info * flow_to_process;
const struct ndpi_ethhdr * ethernet;
const struct ndpi_iphdr * ip;
struct ndpi_ipv6hdr * ip6;
uint64_t time_ms;
const uint16_t eth_offset = 0;
uint16_t ip_offset;
uint16_t ip_size;
const uint8_t * l4_ptr = NULL;
uint16_t l4_len = 0;
uint16_t type;
int thread_index = INITIAL_THREAD_HASH; // generated with `dd if=/dev/random bs=1024 count=1 |& hd'
if (reader_thread == NULL) {
return;
}
workflow = reader_thread->workflow;
if (workflow == NULL) {
return;
}
workflow->packets_captured++;
time_ms = ((uint64_t) header->ts.tv_sec) * TICK_RESOLUTION + header->ts.tv_usec / (1000000 / TICK_RESOLUTION);
workflow->last_time = time_ms;
check_for_idle_flows(workflow);
/* process datalink layer */
switch (pcap_datalink(workflow->pcap_handle)) {
case DLT_NULL:
if (ntohl(*((uint32_t *)&packet[eth_offset])) == 0x00000002) {
type = ETH_P_IP;
} else {
type = ETH_P_IPV6;
}
ip_offset = 4 + eth_offset;
break;
case DLT_EN10MB:
if (header->len < sizeof(struct ndpi_ethhdr)) {
fprintf(stderr, "[%8llu, %d] Ethernet packet too short - skipping\n",
workflow->packets_captured, reader_thread->array_index);
return;
}
ethernet = (struct ndpi_ethhdr *) &packet[eth_offset];
ip_offset = sizeof(struct ndpi_ethhdr) + eth_offset;
type = ntohs(ethernet->h_proto);
switch (type) {
case ETH_P_IP: /* IPv4 */
if (header->len < sizeof(struct ndpi_ethhdr) + sizeof(struct ndpi_iphdr)) {
fprintf(stderr, "[%8llu, %d] IP packet too short - skipping\n",
workflow->packets_captured, reader_thread->array_index);
return;
}
break;
case ETH_P_IPV6: /* IPV6 */
if (header->len < sizeof(struct ndpi_ethhdr) + sizeof(struct ndpi_ipv6hdr)) {
fprintf(stderr, "[%8llu, %d] IP6 packet too short - skipping\n",
workflow->packets_captured, reader_thread->array_index);
return;
}
break;
case ETH_P_ARP: /* ARP */
return;
default:
fprintf(stderr, "[%8llu, %d] Unknown Ethernet packet with type 0x%X - skipping\n",
workflow->packets_captured, reader_thread->array_index, type);
return;
}
break;
default:
fprintf(stderr, "[%8llu, %d] Captured non IP/Ethernet packet with datalink type 0x%X - skipping\n",
workflow->packets_captured, reader_thread->array_index, pcap_datalink(workflow->pcap_handle));
return;
}
if (type == ETH_P_IP) {
ip = (struct ndpi_iphdr *)&packet[ip_offset];
ip6 = NULL;
} else if (type == ETH_P_IPV6) {
ip = NULL;
ip6 = (struct ndpi_ipv6hdr *)&packet[ip_offset];
} else {
fprintf(stderr, "[%8llu, %d] Captured non IPv4/IPv6 packet with type 0x%X - skipping\n",
workflow->packets_captured, reader_thread->array_index, type);
return;
}
ip_size = header->len - ip_offset;
if (type == ETH_P_IP && header->len >= ip_offset) {
if (header->caplen < header->len) {
fprintf(stderr, "[%8llu, %d] Captured packet size is smaller than packet size: %u < %u\n",
workflow->packets_captured, reader_thread->array_index, header->caplen, header->len);
}
}
/* process layer3 e.g. IPv4 / IPv6 */
if (ip != NULL && ip->version == 4) {
if (ip_size < sizeof(*ip)) {
fprintf(stderr, "[%8llu, %d] Packet smaller than IP4 header length: %u < %zu\n",
workflow->packets_captured, reader_thread->array_index, ip_size, sizeof(*ip));
return;
}
flow.l3_type = L3_IP;
if (ndpi_detection_get_l4((uint8_t*)ip, ip_size, &l4_ptr, &l4_len,
&flow.l4_protocol, NDPI_DETECTION_ONLY_IPV4) != 0)
{
fprintf(stderr, "[%8llu, %d] nDPI IPv4/L4 payload detection failed, L4 length: %zu\n",
workflow->packets_captured, reader_thread->array_index, ip_size - sizeof(*ip));
return;
}
flow.ip_tuple.v4.src = ip->saddr;
flow.ip_tuple.v4.dst = ip->daddr;
uint32_t min_addr = (flow.ip_tuple.v4.src > flow.ip_tuple.v4.dst ?
flow.ip_tuple.v4.dst : flow.ip_tuple.v4.src);
thread_index = min_addr + ip->protocol;
} else if (ip6 != NULL) {
if (ip_size < sizeof(ip6->ip6_hdr)) {
fprintf(stderr, "[%8llu, %d] Packet smaller than IP6 header length: %u < %zu\n",
workflow->packets_captured, reader_thread->array_index, ip_size, sizeof(ip6->ip6_hdr));
return;
}
flow.l3_type = L3_IP6;
if (ndpi_detection_get_l4((uint8_t*)ip6, ip_size, &l4_ptr, &l4_len,
&flow.l4_protocol, NDPI_DETECTION_ONLY_IPV6) != 0)
{
fprintf(stderr, "[%8llu, %d] nDPI IPv6/L4 payload detection failed, L4 length: %zu\n",
workflow->packets_captured, reader_thread->array_index, ip_size - sizeof(*ip6));
return;
}
flow.ip_tuple.v6.src[0] = ip6->ip6_src.u6_addr.u6_addr64[0];
flow.ip_tuple.v6.src[1] = ip6->ip6_src.u6_addr.u6_addr64[1];
flow.ip_tuple.v6.dst[0] = ip6->ip6_dst.u6_addr.u6_addr64[0];
flow.ip_tuple.v6.dst[1] = ip6->ip6_dst.u6_addr.u6_addr64[1];
uint64_t min_addr[2];
if (flow.ip_tuple.v6.src[0] > flow.ip_tuple.v6.dst[0] &&
flow.ip_tuple.v6.src[1] > flow.ip_tuple.v6.dst[1])
{
min_addr[0] = flow.ip_tuple.v6.dst[0];
min_addr[1] = flow.ip_tuple.v6.dst[0];
} else {
min_addr[0] = flow.ip_tuple.v6.src[0];
min_addr[1] = flow.ip_tuple.v6.src[0];
}
thread_index = min_addr[0] + min_addr[1] + ip6->ip6_hdr.ip6_un1_nxt;
} else {
fprintf(stderr, "[%8llu, %d] Non IP/IPv6 protocol detected: 0x%X\n",
workflow->packets_captured, reader_thread->array_index, type);
return;
}
/* process layer4 e.g. TCP / UDP */
if (flow.l4_protocol == IPPROTO_TCP) {
const struct ndpi_tcphdr * tcp;
if (header->len < (l4_ptr - packet) + sizeof(struct ndpi_tcphdr)) {
fprintf(stderr, "[%8llu, %d] Malformed TCP packet, packet size smaller than expected: %u < %zu\n",
workflow->packets_captured, reader_thread->array_index,
header->len, (l4_ptr - packet) + sizeof(struct ndpi_tcphdr));
return;
}
tcp = (struct ndpi_tcphdr *)l4_ptr;
flow.is_midstream_flow = (tcp->syn == 0 ? 1 : 0);
flow.flow_fin_ack_seen = (tcp->fin == 1 && tcp->ack == 1 ? 1 : 0);
flow.flow_ack_seen = tcp->ack;
flow.src_port = ntohs(tcp->source);
flow.dst_port = ntohs(tcp->dest);
} else if (flow.l4_protocol == IPPROTO_UDP) {
const struct ndpi_udphdr * udp;
if (header->len < (l4_ptr - packet) + sizeof(struct ndpi_udphdr)) {
fprintf(stderr, "[%8llu, %d] Malformed UDP packet, packet size smaller than expected: %u < %zu\n",
workflow->packets_captured, reader_thread->array_index,
header->len, (l4_ptr - packet) + sizeof(struct ndpi_udphdr));
return;
}
udp = (struct ndpi_udphdr *)l4_ptr;
flow.src_port = ntohs(udp->source);
flow.dst_port = ntohs(udp->dest);
}
/* distribute flows to threads while keeping stability (same flow goes always to same thread) */
thread_index += (flow.src_port < flow.dst_port ? flow.dst_port : flow.src_port);
thread_index %= reader_thread_count;
if (thread_index != reader_thread->array_index) {
return;
}
workflow->packets_processed++;
workflow->total_l4_data_len += l4_len;
#ifdef VERBOSE
print_packet_info(reader_thread, header, l4_len, &flow);
#endif
/* calculate flow hash for btree find, search(insert) */
if (flow.l3_type == L3_IP) {
if (ndpi_flowv4_flow_hash(flow.l4_protocol, flow.ip_tuple.v4.src, flow.ip_tuple.v4.dst,
flow.src_port, flow.dst_port, 0, 0,
(uint8_t *)&flow.hashval, sizeof(flow.hashval)) != 0)
{
flow.hashval = flow.ip_tuple.v4.src + flow.ip_tuple.v4.dst; // fallback
}
} else if (flow.l3_type == L3_IP6) {
if (ndpi_flowv6_flow_hash(flow.l4_protocol, &ip6->ip6_src, &ip6->ip6_dst,
flow.src_port, flow.dst_port, 0, 0,
(uint8_t *)&flow.hashval, sizeof(flow.hashval)) != 0)
{
flow.hashval = flow.ip_tuple.v6.src[0] + flow.ip_tuple.v6.src[1];
flow.hashval += flow.ip_tuple.v6.dst[0] + flow.ip_tuple.v6.dst[1];
}
}
flow.hashval += flow.l4_protocol + flow.src_port + flow.dst_port;
hashed_index = flow.hashval % workflow->max_active_flows;
tree_result = ndpi_tfind(&flow, &workflow->ndpi_flows_active[hashed_index], ndpi_workflow_node_cmp);
if (tree_result == NULL) {
/* flow not found in btree: switch src <-> dst and try to find it again */
uint32_t orig_src_ip[4] = { flow.ip_tuple.u32.src[0], flow.ip_tuple.u32.src[1],
flow.ip_tuple.u32.src[2], flow.ip_tuple.u32.src[3] };
uint32_t orig_dst_ip[4] = { flow.ip_tuple.u32.dst[0], flow.ip_tuple.u32.dst[1],
flow.ip_tuple.u32.dst[2], flow.ip_tuple.u32.dst[3] };
uint16_t orig_src_port = flow.src_port;
uint16_t orig_dst_port = flow.dst_port;
flow.ip_tuple.u32.src[0] = orig_dst_ip[0];
flow.ip_tuple.u32.src[1] = orig_dst_ip[1];
flow.ip_tuple.u32.src[2] = orig_dst_ip[2];
flow.ip_tuple.u32.src[3] = orig_dst_ip[3];
flow.ip_tuple.u32.dst[0] = orig_src_ip[0];
flow.ip_tuple.u32.dst[1] = orig_src_ip[1];
flow.ip_tuple.u32.dst[2] = orig_src_ip[2];
flow.ip_tuple.u32.dst[3] = orig_src_ip[3];
flow.src_port = orig_dst_port;
flow.dst_port = orig_src_port;
tree_result = ndpi_tfind(&flow, &workflow->ndpi_flows_active[hashed_index], ndpi_workflow_node_cmp);
flow.ip_tuple.u32.src[0] = orig_src_ip[0];
flow.ip_tuple.u32.src[1] = orig_src_ip[1];
flow.ip_tuple.u32.src[2] = orig_src_ip[2];
flow.ip_tuple.u32.src[3] = orig_src_ip[3];
flow.ip_tuple.u32.dst[0] = orig_dst_ip[0];
flow.ip_tuple.u32.dst[1] = orig_dst_ip[1];
flow.ip_tuple.u32.dst[2] = orig_dst_ip[2];
flow.ip_tuple.u32.dst[3] = orig_dst_ip[3];
flow.src_port = orig_src_port;
flow.dst_port = orig_dst_port;
}
if (tree_result == NULL) {
/* flow still not found, must be new */
if (workflow->cur_active_flows == workflow->max_active_flows) {
fprintf(stderr, "[%8llu, %d] max flows to track reached: %llu, idle: %llu\n",
workflow->packets_captured, reader_thread->array_index,
workflow->max_active_flows, workflow->cur_idle_flows);
return;
}
flow_to_process = (struct nDPI_flow_info *)ndpi_malloc(sizeof(*flow_to_process));
if (flow_to_process == NULL) {
fprintf(stderr, "[%8llu, %d] Not enough memory for flow info\n",
workflow->packets_captured, reader_thread->array_index);
return;
}
memcpy(flow_to_process, &flow, sizeof(*flow_to_process));
flow_to_process->flow_id = __sync_fetch_and_add(&flow_id, 1);
flow_to_process->ndpi_flow = (struct ndpi_flow_struct *)ndpi_flow_malloc(SIZEOF_FLOW_STRUCT);
if (flow_to_process->ndpi_flow == NULL) {
fprintf(stderr, "[%8llu, %d, %4u] Not enough memory for flow struct\n",
workflow->packets_captured, reader_thread->array_index, flow_to_process->flow_id);
return;
}
memset(flow_to_process->ndpi_flow, 0, SIZEOF_FLOW_STRUCT);
printf("[%8llu, %d, %4u] new %sflow\n", workflow->packets_captured, thread_index,
flow_to_process->flow_id,
(flow_to_process->is_midstream_flow != 0 ? "midstream-" : ""));
if (ndpi_tsearch(flow_to_process, &workflow->ndpi_flows_active[hashed_index], ndpi_workflow_node_cmp) == NULL) {
/* Possible Leak, but should not happen as we'd abort earlier. */
return;
}
workflow->cur_active_flows++;
workflow->total_active_flows++;
} else {
flow_to_process = *(struct nDPI_flow_info **)tree_result;
}
flow_to_process->packets_processed++;
flow_to_process->total_l4_data_len += l4_len;
/* update timestamps, important for timeout handling */
if (flow_to_process->first_seen == 0) {
flow_to_process->first_seen = time_ms;
}
flow_to_process->last_seen = time_ms;
/* current packet is an TCP-ACK? */
flow_to_process->flow_ack_seen = flow.flow_ack_seen;
/* TCP-FIN: indicates that at least one side wants to end the connection */
if (flow.flow_fin_ack_seen != 0 && flow_to_process->flow_fin_ack_seen == 0) {
flow_to_process->flow_fin_ack_seen = 1;
printf("[%8llu, %d, %4u] end of flow\n", workflow->packets_captured, thread_index,
flow_to_process->flow_id);
return;
}
/*
* This example tries to use maximum supported packets for detection:
* for uint8: 0xFF
*/
if (flow_to_process->ndpi_flow->num_processed_pkts == 0xFF) {
return;
} else if (flow_to_process->ndpi_flow->num_processed_pkts == 0xFE) {
/* last chance to guess something, better then nothing */
uint8_t protocol_was_guessed = 0;
flow_to_process->guessed_protocol =
ndpi_detection_giveup(workflow->ndpi_struct,
flow_to_process->ndpi_flow,
1, &protocol_was_guessed);
if (protocol_was_guessed != 0) {
printf("[%8llu, %d, %4d][GUESSED] protocol: %s | app protocol: %s | category: %s\n",
workflow->packets_captured,
reader_thread->array_index,
flow_to_process->flow_id,
ndpi_get_proto_name(workflow->ndpi_struct, flow_to_process->guessed_protocol.master_protocol),
ndpi_get_proto_name(workflow->ndpi_struct, flow_to_process->guessed_protocol.app_protocol),
ndpi_category_get_name(workflow->ndpi_struct, flow_to_process->guessed_protocol.category));
} else {
printf("[%8llu, %d, %4d][FLOW NOT CLASSIFIED]\n",
workflow->packets_captured, reader_thread->array_index, flow_to_process->flow_id);
}
}
flow_to_process->detected_l7_protocol =
ndpi_detection_process_packet(workflow->ndpi_struct, flow_to_process->ndpi_flow,
ip != NULL ? (uint8_t *)ip : (uint8_t *)ip6,
ip_size, time_ms);
if (ndpi_is_protocol_detected(workflow->ndpi_struct,
flow_to_process->detected_l7_protocol) != 0 &&
flow_to_process->detection_completed == 0)
{
if (flow_to_process->detected_l7_protocol.master_protocol != NDPI_PROTOCOL_UNKNOWN ||
flow_to_process->detected_l7_protocol.app_protocol != NDPI_PROTOCOL_UNKNOWN)
{
flow_to_process->detection_completed = 1;
workflow->detected_flow_protocols++;
printf("[%8llu, %d, %4d][DETECTED] protocol: %s | app protocol: %s | category: %s\n",
workflow->packets_captured,
reader_thread->array_index,
flow_to_process->flow_id,
ndpi_get_proto_name(workflow->ndpi_struct, flow_to_process->detected_l7_protocol.master_protocol),
ndpi_get_proto_name(workflow->ndpi_struct, flow_to_process->detected_l7_protocol.app_protocol),
ndpi_category_get_name(workflow->ndpi_struct, flow_to_process->detected_l7_protocol.category));
}
}
if (flow_to_process->ndpi_flow->num_extra_packets_checked <=
flow_to_process->ndpi_flow->max_extra_packets_to_check)
{
/*
* Your business logic starts here.
*
* This example does print some information about
* TLS client and server hellos if available.
*
* You could also use nDPI's built-in json serialization
* and send it to a high-level application for further processing.
*
* EoE - End of Example
*/
if (flow_to_process->flow_info_printed == 0)
{
char const * const flow_info = ndpi_get_flow_info(flow_to_process->ndpi_flow, &flow_to_process->detected_l7_protocol);
if (flow_info != NULL)
{
printf("[%8llu, %d, %4d] info: %s\n",
workflow->packets_captured,
reader_thread->array_index,
flow_to_process->flow_id,
flow_info);
flow_to_process->flow_info_printed = 1;
}
}
if (flow_to_process->detected_l7_protocol.master_protocol == NDPI_PROTOCOL_TLS ||
flow_to_process->detected_l7_protocol.app_protocol == NDPI_PROTOCOL_TLS)
{
if (flow_to_process->tls_client_hello_seen == 0 &&
flow_to_process->ndpi_flow->protos.tls_quic.hello_processed != 0)
{
uint8_t unknown_tls_version = 0;
char buf_ver[16];
printf("[%8llu, %d, %4d][TLS-CLIENT-HELLO] version: %s | sni: %s | alpn: %s\n",
workflow->packets_captured,
reader_thread->array_index,
flow_to_process->flow_id,
ndpi_ssl_version2str(buf_ver, sizeof(buf_ver),
flow_to_process->ndpi_flow->protos.tls_quic.ssl_version,
&unknown_tls_version),
flow_to_process->ndpi_flow->host_server_name,
(flow_to_process->ndpi_flow->protos.tls_quic.alpn != NULL ?
flow_to_process->ndpi_flow->protos.tls_quic.alpn : "-"));
flow_to_process->tls_client_hello_seen = 1;
}
if (flow_to_process->tls_server_hello_seen == 0 &&
flow_to_process->ndpi_flow->l4.tcp.tls.certificate_processed != 0)
{
uint8_t unknown_tls_version = 0;
char buf_ver[16];
printf("[%8llu, %d, %4d][TLS-SERVER-HELLO] version: %s | common-name(s): %.*s | "
"issuer: %s | subject: %s\n",
workflow->packets_captured,
reader_thread->array_index,
flow_to_process->flow_id,
ndpi_ssl_version2str(buf_ver, sizeof(buf_ver),
flow_to_process->ndpi_flow->protos.tls_quic.ssl_version,
&unknown_tls_version),
(flow_to_process->ndpi_flow->protos.tls_quic.server_names_len == 0 ?
1 : flow_to_process->ndpi_flow->protos.tls_quic.server_names_len),
(flow_to_process->ndpi_flow->protos.tls_quic.server_names == NULL ?
"-" : flow_to_process->ndpi_flow->protos.tls_quic.server_names),
(flow_to_process->ndpi_flow->protos.tls_quic.issuerDN != NULL ?
flow_to_process->ndpi_flow->protos.tls_quic.issuerDN : "-"),
(flow_to_process->ndpi_flow->protos.tls_quic.subjectDN != NULL ?
flow_to_process->ndpi_flow->protos.tls_quic.subjectDN : "-"));
flow_to_process->tls_server_hello_seen = 1;
}
}
}
}
static void run_pcap_loop(struct nDPI_reader_thread const * const reader_thread)
{
if (reader_thread->workflow != NULL &&
reader_thread->workflow->pcap_handle != NULL) {
if (pcap_loop(reader_thread->workflow->pcap_handle, -1,
&ndpi_process_packet, (uint8_t *)reader_thread) == PCAP_ERROR) {
fprintf(stderr, "Error while reading pcap file: '%s'\n",
pcap_geterr(reader_thread->workflow->pcap_handle));
__sync_fetch_and_add(&reader_thread->workflow->error_or_eof, 1);
}
}
}
static void break_pcap_loop(struct nDPI_reader_thread * const reader_thread)
{
if (reader_thread->workflow != NULL &&
reader_thread->workflow->pcap_handle != NULL)
{
pcap_breakloop(reader_thread->workflow->pcap_handle);
}
}
static void * processing_thread(void * const ndpi_thread_arg)
{
struct nDPI_reader_thread const * const reader_thread =
(struct nDPI_reader_thread *)ndpi_thread_arg;
printf("Starting Thread %d\n", reader_thread->array_index);
run_pcap_loop(reader_thread);
__sync_fetch_and_add(&reader_thread->workflow->error_or_eof, 1);
return NULL;
}
static int processing_threads_error_or_eof(void)
{
for (int i = 0; i < reader_thread_count; ++i) {
if (__sync_fetch_and_add(&reader_threads[i].workflow->error_or_eof, 0) == 0) {
return 0;
}
}
return 1;
}
static int start_reader_threads(void)
{
#ifndef WIN32
sigset_t thread_signal_set, old_signal_set;
sigfillset(&thread_signal_set);
sigdelset(&thread_signal_set, SIGINT);
sigdelset(&thread_signal_set, SIGTERM);
if (pthread_sigmask(SIG_BLOCK, &thread_signal_set, &old_signal_set) != 0) {
fprintf(stderr, "pthread_sigmask: %s\n", strerror(errno));
return 1;
}
#endif
for (int i = 0; i < reader_thread_count; ++i) {
reader_threads[i].array_index = i;
if (reader_threads[i].workflow == NULL) {
/* no more threads should be started */
break;
}
if (pthread_create(&reader_threads[i].thread_id, NULL,
processing_thread, &reader_threads[i]) != 0)
{
fprintf(stderr, "pthread_create: %s\n", strerror(errno));
return 1;
}
}
if (pthread_sigmask(SIG_BLOCK, &old_signal_set, NULL) != 0) {
fprintf(stderr, "pthread_sigmask: %s\n", strerror(errno));
return 1;
}
return 0;
}
static int stop_reader_threads(void)
{
unsigned long long int total_packets_captured = 0;
unsigned long long int total_packets_processed = 0;
unsigned long long int total_l4_data_len = 0;
unsigned long long int total_flows_captured = 0;
unsigned long long int total_flows_idle = 0;
unsigned long long int total_flows_detected = 0;
for (int i = 0; i < reader_thread_count; ++i) {
break_pcap_loop(&reader_threads[i]);
}
printf("------------------------------------ Stopping reader threads\n");
for (int i = 0; i < reader_thread_count; ++i) {
if (reader_threads[i].workflow == NULL) {
continue;
}
if (pthread_join(reader_threads[i].thread_id, NULL) != 0) {
fprintf(stderr, "pthread_join: %s\n", strerror(errno));
}
total_packets_processed += reader_threads[i].workflow->packets_processed;
total_l4_data_len += reader_threads[i].workflow->total_l4_data_len;
total_flows_captured += reader_threads[i].workflow->total_active_flows;
total_flows_idle += reader_threads[i].workflow->total_idle_flows;
total_flows_detected += reader_threads[i].workflow->detected_flow_protocols;
printf("Stopping Thread %d, processed %10llu packets, %12llu bytes, total flows: %8llu, "
"idle flows: %8llu, detected flows: %8llu\n",
reader_threads[i].array_index, reader_threads[i].workflow->packets_processed,
reader_threads[i].workflow->total_l4_data_len, reader_threads[i].workflow->total_active_flows,
reader_threads[i].workflow->total_idle_flows, reader_threads[i].workflow->detected_flow_protocols);
}
/* total packets captured: same value for all threads as packet2thread distribution happens later */
total_packets_captured = reader_threads[0].workflow->packets_captured;
for (int i = 0; i < reader_thread_count; ++i) {
if (reader_threads[i].workflow == NULL) {
continue;
}
free_workflow(&reader_threads[i].workflow);
}
printf("Total packets captured.: %llu\n", total_packets_captured);
printf("Total packets processed: %llu\n", total_packets_processed);
printf("Total layer4 data size.: %llu\n", total_l4_data_len);
printf("Total flows captured...: %llu\n", total_flows_captured);
printf("Total flows timed out..: %llu\n", total_flows_idle);
printf("Total flows detected...: %llu\n", total_flows_detected);
return 0;
}
static void sighandler(int signum)
{
fprintf(stderr, "Received SIGNAL %d\n", signum);
if (__sync_fetch_and_add(&main_thread_shutdown, 0) == 0) {
__sync_fetch_and_add(&main_thread_shutdown, 1);
} else {
fprintf(stderr, "Reader threads are already shutting down, please be patient.\n");
}
}
int main(int argc, char ** argv)
{
if (argc == 0) {
return 1;
}
printf("usage: %s [PCAP-FILE-OR-INTERFACE]\n"
"----------------------------------\n"
"nDPI version: %s\n"
" API version: %u\n"
"libgcrypt...: %s\n"
"----------------------------------\n",
argv[0],
ndpi_revision(), ndpi_get_api_version(),
(ndpi_get_gcrypt_version() == NULL ? "-" : ndpi_get_gcrypt_version()));
if (setup_reader_threads((argc >= 2 ? argv[1] : NULL)) != 0) {
fprintf(stderr, "%s: setup_reader_threads failed\n", argv[0]);
return 1;
}
if (start_reader_threads() != 0) {
fprintf(stderr, "%s: start_reader_threads\n", argv[0]);
return 1;
}
signal(SIGINT, sighandler);
signal(SIGTERM, sighandler);
while (__sync_fetch_and_add(&main_thread_shutdown, 0) == 0 && processing_threads_error_or_eof() == 0) {
sleep(1);
}
if (stop_reader_threads() != 0) {
fprintf(stderr, "%s: stop_reader_threads\n", argv[0]);
return 1;
}
return 0;
}