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fastnetmon/src/netflow_plugin/netflow_collector.cpp

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/* netflow plugin body */
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <inttypes.h>
#include <netdb.h>
#include <vector>
#include <map>
#include "../fast_library.h"
#include "../ipfix_rfc.h"
// log4cpp logging facility
#include "log4cpp/Category.hh"
#include "log4cpp/Appender.hh"
#include "log4cpp/FileAppender.hh"
#include "log4cpp/OstreamAppender.hh"
#include "log4cpp/Layout.hh"
#include "log4cpp/BasicLayout.hh"
#include "log4cpp/PatternLayout.hh"
#include "log4cpp/Priority.hh"
#ifdef ENABLE_LUA_HOOKS
#include <luajit-2.0/lua.hpp>
#endif
#ifdef ENABLE_LUA_HOOKS
lua_State* netflow_lua_state = NULL;
bool lua_hooks_enabled = false;
std::string lua_hooks_path = "/usr/src/fastnetmon/src/netflow_hooks.lua";
#endif
// Get it from main programm
extern log4cpp::Category& logger;
// Global configuration map
extern std::map<std::string, std::string> configuration_map;
// Sampling rate for all netflow agents
unsigned int sampling_rate = 1;
std::string netflow_plugin_name = "netflow";
std::string netflow_plugin_log_prefix = netflow_plugin_name + ": ";
// Divide packets and bytes counters from the flow by interval length for more 'smoother' data
bool netflow_divide_counters_on_interval_length = false;
ipfix_information_database ipfix_db_instance;
#include "netflow_collector.h"
#include "netflow.h"
// If we wan't listen on IPv4 and IPv6 i nsame time we need listen multiple sockets. Not good,
// right.
// TODO: add per source uniq templates support
process_packet_pointer netflow_process_func_ptr = NULL;
typedef std::map<u_int, struct peer_nf9_template> template_storage_t;
typedef std::map<std::string, template_storage_t> global_template_storage_t;
global_template_storage_t global_netflow9_templates;
global_template_storage_t global_netflow10_templates;
/* Prototypes */
void add_peer_template(global_template_storage_t& table_for_add,
u_int32_t source_id,
u_int template_id,
std::string client_addres_in_string_format,
struct peer_nf9_template& field_template);
int nf9_rec_to_flow(u_int record_type,
u_int record_length,
u_int8_t* data,
simple_packet& packet,
netflow9_template_records_map& template_records);
struct peer_nf9_template* peer_find_template(global_template_storage_t& table_for_lookup,
u_int32_t source_id,
u_int template_id,
std::string client_addres_in_string_format) {
// We use source_id for distinguish multiple netflow agents with same IP
std::string key = client_addres_in_string_format + "_" + convert_int_to_string(source_id);
global_template_storage_t::iterator itr = table_for_lookup.find(key);
if (itr == table_for_lookup.end()) {
return NULL;
}
// Well, we find it!
if (itr->second.count(template_id) > 0) {
return &itr->second[template_id];
} else {
return NULL;
}
}
// Wrapper functions
struct peer_nf9_template*
peer_nf9_find_template(u_int32_t source_id, u_int template_id, std::string client_addres_in_string_format) {
return peer_find_template(global_netflow9_templates, source_id, template_id, client_addres_in_string_format);
}
struct peer_nf9_template*
peer_nf10_find_template(u_int32_t source_id, u_int template_id, std::string client_addres_in_string_format) {
return peer_find_template(global_netflow10_templates, source_id, template_id, client_addres_in_string_format);
}
std::string print_peer_nf9_template(struct peer_nf9_template& field_template) {
std::stringstream buffer;
buffer << "template_id: " << field_template.template_id << "\n"
<< "num records: " << field_template.num_records << "\n"
<< "total len: " << field_template.total_len << "\n";
for (netflow9_template_records_map::iterator itr = field_template.records.begin();
itr != field_template.records.end(); ++itr) {
buffer << "Records\n";
unsigned int length_from_database = ipfix_db_instance.get_length_by_id(itr->type);
buffer << "type: " << itr->type << "\n";
buffer << "len: " << itr->len << "\n";
buffer << "name from database: " << ipfix_db_instance.get_name_by_id(itr->type) << "\n";
buffer << "length from database: " << length_from_database << "\n";
if (length_from_database != itr->len) {
buffer << "ATTENTION!!!! Length from database is not equal to length from received "
"from the device\n";
}
buffer << "\n";
}
return buffer.str();
}
struct NF10_OPTIONS_HEADER_COMMON {
u_int16_t flowset_id;
u_int16_t length;
};
struct NF10_OPTIONS_HEADER {
u_int16_t template_id;
u_int16_t field_count;
u_int16_t scope_field_count;
};
// https://tools.ietf.org/html/rfc5101#page-18
int process_netflow_v10_options_template(u_int8_t* pkt, size_t len, u_int32_t source_id) {
struct NF10_OPTIONS_HEADER_COMMON* options_template_header = (struct NF10_OPTIONS_HEADER_COMMON*)pkt;
if (len < sizeof(*options_template_header)) {
logger << log4cpp::Priority::ERROR << "Short netflow ipfix options template header";
return 1;
}
if (ntohs(options_template_header->flowset_id) != NF10_OPTIONS_FLOWSET_ID) {
logger << log4cpp::Priority::ERROR << "Function process_netflow_v10_options_template "
"expects only NF10_OPTIONS_FLOWSET_ID but got "
"another id: " << ntohs(options_template_header->flowset_id);
return 1;
}
struct NF10_OPTIONS_HEADER* options_nested_header =
(struct NF10_OPTIONS_HEADER*)(pkt + sizeof(struct NF10_OPTIONS_HEADER_COMMON*));
// Yes, I should convert it to host byter order but it broke it!
// WTF??
u_int16_t template_id = options_nested_header->template_id;
if (template_id <= 255) {
logger << log4cpp::Priority::ERROR
<< "Template ID for options template should be bigger than 255";
return 1;
}
u_int16_t field_count = ntohs(options_nested_header->field_count);
u_int16_t scope_field_count = ntohs(options_nested_header->scope_field_count);
logger << log4cpp::Priority::INFO << "Options template id: " << template_id
<< " field_count: " << field_count << " scope_field_count: " << scope_field_count;
return 0;
}
int process_netflow_v10_template(u_int8_t* pkt, size_t len, u_int32_t source_id, std::string client_addres_in_string_format) {
struct NF10_FLOWSET_HEADER_COMMON* template_header = (struct NF10_FLOWSET_HEADER_COMMON*)pkt;
// We use same struct as netflow v9 because netflow v9 and v10 (ipfix) is compatible
struct peer_nf9_template field_template;
if (len < sizeof(*template_header)) {
logger << log4cpp::Priority::ERROR << "Short netflow ipfix flowset template header";
return 1;
}
if (ntohs(template_header->flowset_id) != NF10_TEMPLATE_FLOWSET_ID) {
logger << log4cpp::Priority::ERROR
<< "Function process_netflow_v10_template expects only NF10_TEMPLATE_FLOWSET_ID but "
"got another id: " << ntohs(template_header->flowset_id);
return 1;
}
for (u_int offset = sizeof(*template_header); offset < len;) {
struct NF10_TEMPLATE_FLOWSET_HEADER* tmplh = (struct NF10_TEMPLATE_FLOWSET_HEADER*)(pkt + offset);
u_int template_id = ntohs(tmplh->template_id);
u_int count = ntohs(tmplh->count);
offset += sizeof(*tmplh);
netflow9_template_records_map template_records_map;
u_int total_size = 0;
for (u_int i = 0; i < count; i++) {
if (offset >= len) {
logger << log4cpp::Priority::ERROR << "short netflow v.10 flowset template";
return 1;
}
struct NF10_TEMPLATE_FLOWSET_RECORD* tmplr = (struct NF10_TEMPLATE_FLOWSET_RECORD*)(pkt + offset);
u_int record_type = ntohs(tmplr->type);
u_int record_length = ntohs(tmplr->length);
struct peer_nf9_record current_record;
current_record.type = record_type;
current_record.len = record_length;
template_records_map.push_back(current_record);
offset += sizeof(*tmplr);
if (record_type & NF10_ENTERPRISE) {
offset += sizeof(u_int32_t); /* XXX -- ? */
}
total_size += record_length;
// add check: if (total_size > peers->max_template_len)
}
field_template.num_records = count;
field_template.total_len = total_size;
field_template.records = template_records_map;
add_peer_template(global_netflow10_templates, source_id, template_id,
client_addres_in_string_format, field_template);
}
return 0;
}
int process_netflow_v9_template(u_int8_t* pkt, size_t len, u_int32_t source_id, std::string client_addres_in_string_format) {
struct NF9_FLOWSET_HEADER_COMMON* template_header = (struct NF9_FLOWSET_HEADER_COMMON*)pkt;
struct peer_nf9_template field_template;
if (len < sizeof(*template_header)) {
logger << log4cpp::Priority::ERROR << "Short netflow v9 flowset template header";
return 1;
}
if (ntohs(template_header->flowset_id) != NF9_TEMPLATE_FLOWSET_ID) {
logger << log4cpp::Priority::ERROR
<< "Function process_netflow_v9_template expects only NF9_TEMPLATE_FLOWSET_ID but "
"got another id: " << ntohs(template_header->flowset_id);
return 1;
}
for (u_int offset = sizeof(*template_header); offset < len;) {
struct NF9_TEMPLATE_FLOWSET_HEADER* tmplh = (struct NF9_TEMPLATE_FLOWSET_HEADER*)(pkt + offset);
u_int template_id = ntohs(tmplh->template_id);
u_int count = ntohs(tmplh->count);
offset += sizeof(*tmplh);
// logger<< log4cpp::Priority::INFO<<"Template template_id is:"<<template_id;
u_int total_size = 0;
netflow9_template_records_map template_records_map;
for (u_int i = 0; i < count; i++) {
if (offset >= len) {
logger << log4cpp::Priority::ERROR << "short netflow v.9 flowset template";
return 1;
}
struct NF9_TEMPLATE_FLOWSET_RECORD* tmplr = (struct NF9_TEMPLATE_FLOWSET_RECORD*)(pkt + offset);
u_int record_type = ntohs(tmplr->type);
u_int record_length = ntohs(tmplr->length);
struct peer_nf9_record current_record;
current_record.type = record_type;
current_record.len = record_length;
template_records_map.push_back(current_record);
// logger<< log4cpp::Priority::INFO<<"Learn new template type: "<<ntohs(tmplr->type)<<"
// length:"<<ntohs(tmplr->length);
offset += sizeof(*tmplr);
total_size += record_length;
// TODO: introduce nf9_check_rec_len
}
field_template.num_records = count;
field_template.total_len = total_size;
field_template.records = template_records_map;
// Add/update template
add_peer_template(global_netflow9_templates, source_id, template_id,
client_addres_in_string_format, field_template);
}
return 0;
}
void add_peer_template(global_template_storage_t& table_for_add,
u_int32_t source_id,
u_int template_id,
std::string client_addres_in_string_format,
struct peer_nf9_template& field_template) {
std::string key = client_addres_in_string_format + "_" + convert_int_to_string(source_id);
// logger<< log4cpp::Priority::INFO<<"It's new option template "<<template_id<<" for host:
// "<<client_addres_in_string_format
// <<" with source id: "<<source_id;
global_template_storage_t::iterator itr = table_for_add.find(key);
if (itr != table_for_add.end()) {
if (itr->second.count(template_id) > 0) {
// logger<< log4cpp::Priority::INFO<<"We already have information about this template
// with id:"
// <<template_id<<" for host: "<<client_addres_in_string_format;
// TODO: update time to time template data
itr->second[template_id] = field_template;
} else {
// logger<< log4cpp::Priority::INFO<<"It's new option template "<<template_id<<" for
// host: "<<client_addres_in_string_format;
itr->second[template_id] = field_template;
}
} else {
template_storage_t temp_template_storage;
temp_template_storage[template_id] = field_template;
table_for_add[key] = temp_template_storage;
}
return;
}
/* Copy an int (possibly shorter than the target) keeping their LSBs aligned */
#define BE_COPY(a) memcpy((u_char*)&a + (sizeof(a) - record_length), data, record_length);
#define V9_FIELD(v9_field, store_field, flow_field) \
case v9_field: \
BE_COPY(packet.flow_field); \
break
#define V9_FIELD_ADDR(v9_field, store_field, flow_field) \
case v9_field: \
memcpy(&packet.flow_field, data, record_length); \
break
int nf9_rec_to_flow(u_int record_type, u_int record_length, u_int8_t* data, simple_packet& packet) {
/* XXX: use a table-based interpreter */
switch (record_type) {
V9_FIELD(NF9_IN_BYTES, OCTETS, length);
V9_FIELD(NF9_IN_PACKETS, PACKETS, number_of_packets);
V9_FIELD(NF9_IN_PROTOCOL, PROTO_FLAGS_TOS, protocol);
V9_FIELD(NF9_TCP_FLAGS, PROTO_FLAGS_TOS, flags);
V9_FIELD(NF9_L4_SRC_PORT, SRCDST_PORT, source_port);
V9_FIELD(NF9_L4_DST_PORT, SRCDST_PORT, destination_port);
case NF9_IPV4_SRC_ADDR:
memcpy(&packet.src_ip, data, record_length);
break;
case NF9_IPV4_DST_ADDR:
memcpy(&packet.dst_ip, data, record_length);
break;
case NF9_INPUT_SNMP: {
// TODO: port number could be 4 byte (Juniper MX) and we should rewrite BE_COPY for correct handling
uint16_t input_port = 0;
if (record_length > sizeof(input_port)) {
//logger << log4cpp::Priority::ERROR << "Received very big packet for NF9_INPUT_SNMP!";
//return 0;
} else {
BE_COPY(input_port);
input_port = fast_ntoh(input_port);
// logger << log4cpp::Priority::INFO << "NF9_INPUT_SNMP is: " << input_port;
}
}
break;
case NF9_OUTPUT_SNMP: {
uint16_t output_port = 0;
if (record_length > sizeof(output_port)) {
//logger << log4cpp::Priority::ERROR << "Received very big packet for NF9_OUTPUT_SNMP!";
//return 0;
} else {
BE_COPY(output_port);
output_port = fast_ntoh(output_port);
// logger << log4cpp::Priority::INFO << "NF9_OUTPUT_SNMP is: " << output_port;
}
}
break;
//V9_FIELD_ADDR(NF9_IPV4_SRC_ADDR, SRC_ADDR4, src_ip);
//V9_FIELD_ADDR(NF9_IPV4_DST_ADDR, DST_ADDR4, dst_ip);
// Sampling rate
// We use NULL as second argument because it's suelles for us
// It did not help us because looks like sampling rate implemented with OPTIONS flowset
// V9_FIELD(NF9_SAMPLING_INTERVAL, NULL, sample_ratio);
// V9_FIELD(NF9_SRC_TOS, PROTO_FLAGS_TOS, pft.tos);
// V9_FIELD(NF9_SRC_MASK, AS_INFO, asinf.src_mask);
// V9_FIELD(NF9_INPUT_SNMP, IF_INDICES, ifndx.if_index_in);
// V9_FIELD(NF9_DST_MASK, AS_INFO, asinf.dst_mask);
// V9_FIELD(NF9_OUTPUT_SNMP, IF_INDICES, ifndx.if_index_out);
// V9_FIELD(NF9_SRC_AS, AS_INFO, asinf.src_as);
// V9_FIELD(NF9_DST_AS, AS_INFO, asinf.dst_as);
// V9_FIELD(NF9_LAST_SWITCHED, FLOW_TIMES, ftimes.flow_finish);
// V9_FIELD(NF9_FIRST_SWITCHED, FLOW_TIMES, ftimes.flow_start);
// V9_FIELD(NF9_IPV6_SRC_MASK, AS_INFO, asinf.src_mask);
// V9_FIELD(NF9_IPV6_DST_MASK, AS_INFO, asinf.dst_mask);
// V9_FIELD(NF9_ENGINE_TYPE, FLOW_ENGINE_INFO, finf.engine_type);
// V9_FIELD(NF9_ENGINE_ID, FLOW_ENGINE_INFO, finf.engine_id);
// V9_FIELD_ADDR(NF9_IPV4_NEXT_HOP, GATEWAY_ADDR4, gateway_addr, 4, INET);
// V9_FIELD_ADDR(NF9_IPV6_SRC_ADDR, SRC_ADDR6, src_addr, 6, INET6);
// V9_FIELD_ADDR(NF9_IPV6_DST_ADDR, DST_ADDR6, dst_addr, 6, INET6);
// V9_FIELD_ADDR(NF9_IPV6_NEXT_HOP, GATEWAY_ADDR6, gateway_addr, 6, INET6);
//#undef V9_FIELD
//#undef V9_FIELD_ADDR
//#undef BE_COPY
}
return 0;
}
int nf10_rec_to_flow(u_int record_type, u_int record_length, u_int8_t* data, simple_packet& packet) {
/* XXX: use a table-based interpreter */
switch (record_type) {
V9_FIELD(NF10_IN_BYTES, OCTETS, length);
V9_FIELD(NF10_IN_PACKETS, PACKETS, number_of_packets);
V9_FIELD(NF10_IN_PROTOCOL, PROTO_FLAGS_TOS, protocol);
V9_FIELD(NF10_TCP_FLAGS, PROTO_FLAGS_TOS, flags);
V9_FIELD(NF10_L4_SRC_PORT, SRCDST_PORT, source_port);
V9_FIELD(NF10_L4_DST_PORT, SRCDST_PORT, destination_port);
V9_FIELD_ADDR(NF10_IPV4_SRC_ADDR, SRC_ADDR4, src_ip);
V9_FIELD_ADDR(NF10_IPV4_DST_ADDR, DST_ADDR4, dst_ip);
}
return 0;
}
// We use maximum possible variable langth
// But devices can send shoretr data to us
typedef struct netflow_ipfix_struct {
uint32_t sourceIPv4Address;
uint32_t destinationIPv4Address;
uint16_t sourceTransportPort;
uint16_t destinationTransportPort;
uint16_t tcpControlBits;
uint8_t protocolIdentifier;
uint64_t octetDeltaCount;
uint64_t packetDeltaCount;
} netflow_ipfix_struct;
// We should rewrite nf9_flowset_to_store accroding to fixes here
void nf10_flowset_to_store(u_int8_t* pkt, size_t len, struct NF10_HEADER* nf10_hdr, struct peer_nf9_template* field_template) {
u_int offset = 0;
if (len < field_template->total_len) {
logger << log4cpp::Priority::ERROR << "Total len from template bigger than packet len";
return;
}
simple_packet packet;
// We use shifted values and should process only zeroed values
// because we are working with little and big endian data in same time
packet.number_of_packets = 0;
packet.ts.tv_sec = ntohl(nf10_hdr->time_sec);
packet.sample_ratio = sampling_rate;
netflow_ipfix_struct data_in_ipfix_format;
memset(&data_in_ipfix_format, 0, sizeof(netflow_ipfix_struct));
for (netflow9_template_records_map::iterator iter = field_template->records.begin();
iter != field_template->records.end(); iter++) {
u_int record_type = iter->type;
u_int record_length = iter->len;
nf10_rec_to_flow(record_type, record_length, pkt + offset, packet);
// New code
/*
unsigned int field_id = record_type;
std::string field_name = ipfix_db_instance.get_name_by_id(field_id);
if (field_name == "octetDeltaCount") {
unsigned int reference_field_length = sizeof(data_in_ipfix_format.octetDeltaCount);
if (reference_field_length == record_length) {
// We use standard copy
memcpy(&data_in_ipfix_format.octetDeltaCount, pkt + offset, record_length);
// Convert to host byte order
data_in_ipfix_format.octetDeltaCount =
fast_ntoh(data_in_ipfix_format.octetDeltaCount);
} else if (record_length < reference_field_length) {
logger<< log4cpp::Priority::ERROR<<"We can't copy data because magic memcpy is not
implemented yet";
// We use copy memcpy for netfowrk byte order
} else {
// Holy cow! It's impossible!
logger<< log4cpp::Priority::ERROR<<"We can't copy data because receiver data is
bigger than our storage.";
return;
}
logger<< log4cpp::Priority::INFO<<"We received packet size with new parser:
"<<data_in_ipfix_format.octetDeltaCount;
}
*/
offset += record_length;
}
// decode data in network byte order to host byte order
packet.length = fast_ntoh(packet.length);
packet.number_of_packets = fast_ntoh(packet.number_of_packets);
packet.protocol = fast_ntoh(packet.protocol);
// We should convert ports to host byte order too
packet.source_port = fast_ntoh(packet.source_port);
packet.destination_port = fast_ntoh(packet.destination_port);
packet.ip_protocol_version = 4;
// Set protocol
switch (packet.protocol) {
case 1: {
packet.protocol = IPPROTO_ICMP;
packet.source_port = 0;
packet.destination_port = 0;
} break;
case 6: {
packet.protocol = IPPROTO_TCP;
} break;
case 17: {
packet.protocol = IPPROTO_UDP;
} break;
}
// pass data to FastNetMon
netflow_process_func_ptr(packet);
}
void nf9_flowset_to_store(u_int8_t* pkt, size_t len, struct NF9_HEADER* nf9_hdr, netflow9_template_records_map& template_records) {
// Should be done according to https://github.com/FastVPSEestiOu/fastnetmon/issues/147
// if (template->total_len > len)
// return 1;
u_int offset = 0;
simple_packet packet;
// We use shifted values and should process only zeroed values
// because we are working with little and big endian data in same time
packet.number_of_packets = 0;
packet.ts.tv_sec = ntohl(nf9_hdr->time_sec);
packet.sample_ratio = sampling_rate;
// We should iterate over all available template fields
for (netflow9_template_records_map::iterator iter = template_records.begin();
iter != template_records.end(); iter++) {
u_int record_type = iter->type;
u_int record_length = iter->len;
int nf9_rec_to_flow_result = nf9_rec_to_flow(record_type, record_length, pkt + offset, packet);
// logger<< log4cpp::Priority::INFO<<"Read data with type: "<<record_type<<" and
// length:"<<record_length;
if (nf9_rec_to_flow_result != 0) {
return;
}
offset += record_length;
}
// decode data in network byte order to host byte order
packet.length = fast_ntoh(packet.length);
packet.number_of_packets = fast_ntoh(packet.number_of_packets);
packet.protocol = fast_ntoh(packet.protocol);
// We should convert ports to host byte order too
packet.source_port = fast_ntoh(packet.source_port);
packet.destination_port = fast_ntoh(packet.destination_port);
packet.ip_protocol_version = 4;
// Set protocol
switch (packet.protocol) {
case 1: {
packet.protocol = IPPROTO_ICMP;
packet.source_port = 0;
packet.destination_port = 0;
} break;
case 6: {
packet.protocol = IPPROTO_TCP;
} break;
case 17: {
packet.protocol = IPPROTO_UDP;
} break;
}
// pass data to FastNetMon
netflow_process_func_ptr(packet);
}
int process_netflow_v10_data(u_int8_t* pkt,
size_t len,
struct NF10_HEADER* nf10_hdr,
u_int32_t source_id,
std::string client_addres_in_string_format) {
struct NF10_DATA_FLOWSET_HEADER* dath = (struct NF10_DATA_FLOWSET_HEADER*)pkt;
if (len < sizeof(*dath)) {
logger << log4cpp::Priority::INFO << "Short netflow v10 data flowset header";
return 1;
}
u_int flowset_id = ntohs(dath->c.flowset_id);
struct peer_nf9_template* flowset_template =
peer_nf10_find_template(source_id, flowset_id, client_addres_in_string_format);
if (flowset_template == NULL) {
logger << log4cpp::Priority::INFO << "We don't have a template for flowset_id: " << flowset_id
<< " but it's not an error if this message disappears in 5-10 seconds. We need some "
"time to learn it!";
return 1;
}
if (flowset_template->records.empty()) {
logger << log4cpp::Priority::ERROR << "Blank records in template";
return 1;
}
u_int offset = sizeof(*dath);
u_int num_flowsets = (len - offset) / flowset_template->total_len;
if (num_flowsets == 0 || num_flowsets > 0x4000) {
logger << log4cpp::Priority::ERROR
<< "Invalid number of data flowset, strange number of flows: " << num_flowsets;
return 1;
}
for (u_int i = 0; i < num_flowsets; i++) {
// process whole flowset
nf10_flowset_to_store(pkt + offset, flowset_template->total_len, nf10_hdr, flowset_template);
offset += flowset_template->total_len;
}
return 0;
}
int process_netflow_v9_data(u_int8_t* pkt, size_t len, struct NF9_HEADER* nf9_hdr, u_int32_t source_id, std::string client_addres_in_string_format) {
struct NF9_DATA_FLOWSET_HEADER* dath = (struct NF9_DATA_FLOWSET_HEADER*)pkt;
if (len < sizeof(*dath)) {
logger << log4cpp::Priority::INFO << "Short netflow v9 data flowset header";
return 1;
}
u_int flowset_id = ntohs(dath->c.flowset_id);
// logger<< log4cpp::Priority::INFO<<"We have data with flowset_id: "<<flowset_id;
// We should find template here
struct peer_nf9_template* flowset_template =
peer_nf9_find_template(source_id, flowset_id, client_addres_in_string_format);
if (flowset_template == NULL) {
logger << log4cpp::Priority::INFO << "We don't have a template for flowset_id: " << flowset_id
<< " but it's not an error if this message disappears in 5-10 seconds. We need some "
"time to learn it!";
return 0;
}
if (flowset_template->records.empty()) {
logger << log4cpp::Priority::ERROR << "Blank records in template";
return 1;
}
u_int offset = sizeof(*dath);
u_int num_flowsets = (len - offset) / flowset_template->total_len;
if (num_flowsets == 0 || num_flowsets > 0x4000) {
logger << log4cpp::Priority::ERROR
<< "Invalid number of data flowsets, strange number of flows: " << num_flowsets;
return 1;
}
for (u_int i = 0; i < num_flowsets; i++) {
// process whole flowset
nf9_flowset_to_store(pkt + offset, flowset_template->total_len, nf9_hdr, flowset_template->records);
offset += flowset_template->total_len;
}
return 0;
}
void process_netflow_packet_v10(u_int8_t* packet, u_int len, std::string client_addres_in_string_format) {
struct NF10_HEADER* nf10_hdr = (struct NF10_HEADER*)packet;
struct NF10_FLOWSET_HEADER_COMMON* flowset;
u_int32_t i, pktlen, flowset_id, flowset_len, flowset_flows;
u_int32_t offset, source_id, total_flows;
if (len < sizeof(*nf10_hdr)) {
logger << log4cpp::Priority::ERROR << "Short netflow v10 header";
return;
}
/* v10 uses pkt length, not # of flows */
pktlen = ntohs(nf10_hdr->c.flows);
source_id = ntohl(nf10_hdr->source_id);
offset = sizeof(*nf10_hdr);
total_flows = 0;
for (i = 0;; i++) {
if (offset >= len) {
logger << log4cpp::Priority::ERROR
<< "We tried to read from address outside netflow packet";
return;
}
flowset = (struct NF10_FLOWSET_HEADER_COMMON*)(packet + offset);
flowset_id = ntohs(flowset->flowset_id);
flowset_len = ntohs(flowset->length);
/*
* Yes, this is a near duplicate of the short packet check
* above, but this one validates the flowset length from in
* the packet before we pass it to the flowset-specific
* handlers below.
*/
if (offset + flowset_len > len) {
logger << log4cpp::Priority::ERROR
<< "We tried to read from address outside netflow's packet flowset";
return;
}
switch (flowset_id) {
case NF10_TEMPLATE_FLOWSET_ID:
if (process_netflow_v10_template(packet + offset, flowset_len, source_id,
client_addres_in_string_format) != 0) {
logger << log4cpp::Priority::ERROR
<< "Function process_netflow_v10_template executed with errors";
break;
}
break;
case NF10_OPTIONS_FLOWSET_ID:
// process_netflow_v10_options_template(packet + offset, flowset_len, source_id);
logger << log4cpp::Priority::INFO
<< "Received ipfix options flowset id, which is not supported";
/* Not implemented yet */
break;
default:
if (flowset_id < NF10_MIN_RECORD_FLOWSET_ID) {
logger << log4cpp::Priority::ERROR
<< "Received unknown netflow v10 reserved flowset type " << flowset_id;
break;
}
if (process_netflow_v10_data(packet + offset, flowset_len, nf10_hdr, source_id,
client_addres_in_string_format) != 0) {
// logger<< log4cpp::Priority::ERROR<<"Can't process function
// process_netflow_v10_data correctly";
return;
}
break;
}
offset += flowset_len;
if (offset == len) {
break;
}
}
}
void process_netflow_packet_v9(u_int8_t* packet, u_int len, std::string client_addres_in_string_format) {
// logger<< log4cpp::Priority::INFO<<"We get v9 netflow packet!";
struct NF9_HEADER* nf9_hdr = (struct NF9_HEADER*)packet;
struct NF9_FLOWSET_HEADER_COMMON* flowset;
u_int32_t count, flowset_id, flowset_len, flowset_flows;
u_int32_t offset, source_id, total_flows;
if (len < sizeof(*nf9_hdr)) {
logger << log4cpp::Priority::ERROR << "Short netflow v9 header";
return;
}
count = ntohs(nf9_hdr->c.flows);
source_id = ntohl(nf9_hdr->source_id);
// logger<< log4cpp::Priority::INFO<<"Template source id: "<<source_id;
offset = sizeof(*nf9_hdr);
total_flows = 0;
for (u_int32_t i = 0;; i++) {
/* Make sure we don't run off the end of the flow */
if (offset >= len) {
logger << log4cpp::Priority::ERROR
<< "We tried to read from address outside netflow packet";
return;
}
flowset = (struct NF9_FLOWSET_HEADER_COMMON*)(packet + offset);
flowset_id = ntohs(flowset->flowset_id);
flowset_len = ntohs(flowset->length);
/*
* Yes, this is a near duplicate of the short packet check
* above, but this one validates the flowset length from in
* the packet before we pass it to the flowset-specific
* handlers below.
*/
if (offset + flowset_len > len) {
logger << log4cpp::Priority::ERROR
<< "We tried to read from address outside netflow's packet flowset";
return;
}
switch (flowset_id) {
case NF9_TEMPLATE_FLOWSET_ID:
// logger<< log4cpp::Priority::INFO<<"We read template";
if (process_netflow_v9_template(packet + offset, flowset_len, source_id,
client_addres_in_string_format) != 0) {
logger << log4cpp::Priority::ERROR
<< "Function process_netflow_v9_template executed with errors";
break;
}
break;
case NF9_OPTIONS_FLOWSET_ID:
logger << log4cpp::Priority::INFO
<< "I received netflow v9 options flowset id but I haven't support for it";
/* Not implemented yet */
break;
default:
if (flowset_id < NF9_MIN_RECORD_FLOWSET_ID) {
logger << log4cpp::Priority::ERROR
<< "Received unknown netflow v9 reserved flowset type " << flowset_id;
break;
}
// logger<< log4cpp::Priority::INFO<<"We read data";
if (process_netflow_v9_data(packet + offset, flowset_len, nf9_hdr, source_id,
client_addres_in_string_format) != 0) {
// logger<< log4cpp::Priority::ERROR<<"Can't process function
// process_netflow_v9_data correctly";
return;
}
break;
}
offset += flowset_len;
if (offset == len) {
break;
}
}
}
void process_netflow_packet_v5(u_int8_t* packet, u_int len, std::string client_addres_in_string_format) {
// logger<< log4cpp::Priority::INFO<<"We get v5 netflow packet!";
struct NF5_HEADER* nf5_hdr = (struct NF5_HEADER*)packet;
if (len < sizeof(*nf5_hdr)) {
logger << log4cpp::Priority::ERROR << "Short netflow v5 packet " << len;
return;
}
u_int nflows = ntohs(nf5_hdr->c.flows);
if (nflows == 0 || nflows > NF5_MAXFLOWS) {
logger << log4cpp::Priority::ERROR << "Invalid number of flows in netflow " << nflows;
return;
}
uint16_t netflow5_sampling_ratio = fast_ntoh(nf5_hdr->sampling_rate);
// In first two bits we store sampling type.
// We are not interested in it and should zeroify it for getting correct value of sampling rate
clear_bit_value(netflow5_sampling_ratio, 15);
clear_bit_value(netflow5_sampling_ratio, 16);
// Sampling not enabled on device
if (netflow5_sampling_ratio == 0) {
netflow5_sampling_ratio = 1;
}
for (u_int i = 0; i < nflows; i++) {
size_t offset = NF5_PACKET_SIZE(i);
struct NF5_FLOW* nf5_flow = (struct NF5_FLOW*)(packet + offset);
/* Check packet bounds */
if (offset + sizeof(struct NF5_FLOW) > len) {
logger << log4cpp::Priority::ERROR << "Error! You will try to read outside the packet";
}
/* Decode to host encoding */
// TODO: move to separate function
nf5_flow->flow_octets = fast_ntoh(nf5_flow->flow_octets);
nf5_flow->flow_packets = fast_ntoh(nf5_flow->flow_packets);
nf5_flow->if_index_in = fast_ntoh(nf5_flow->if_index_in);
nf5_flow->if_index_out = fast_ntoh(nf5_flow->if_index_out);
// convert netflow to simple packet form
simple_packet current_packet;
current_packet.src_ip = nf5_flow->src_ip;
current_packet.dst_ip = nf5_flow->dest_ip;
current_packet.ts.tv_sec = ntohl(nf5_hdr->time_sec);
current_packet.ts.tv_usec = ntohl(nf5_hdr->time_nanosec);
current_packet.flags = 0;
current_packet.source_port = 0;
current_packet.destination_port = 0;
// TODO: we should pass data about "flow" structure of this data
current_packet.length = nf5_flow->flow_octets;
current_packet.number_of_packets = nf5_flow->flow_packets;
if (netflow_divide_counters_on_interval_length) {
// This interval in milliseconds, convert it to seconds
int64_t interval_length = (fast_ntoh(nf5_flow->flow_finish) - fast_ntoh(nf5_flow->flow_start)) / 1000;
/*
if (interval_length > 0) {
logger << log4cpp::Priority::INFO << "NetFlow v5 from: " << client_addres_in_string_format
<< " start: " << fast_ntoh(nf5_flow->flow_start)
<< " finish: " << fast_ntoh(nf5_flow->flow_finish)
<< " interval length:" << interval_length
<< "\n";
}
*/
if (interval_length == 0) {
// it's OK
} else if (interval_length < 0) {
// it's internal error
logger << log4cpp::Priority::ERROR << "We got negative interval length from netflow agent, something goes wrong!";
} else {
// OK, let's divide
// We will get integer result for this operation
current_packet.length = current_packet.length / interval_length;
current_packet.number_of_packets = current_packet.number_of_packets / interval_length;
}
}
// TODO: use sampling data from packet, disable customization here
// Wireshark dump approves this idea
current_packet.sample_ratio = netflow5_sampling_ratio;
current_packet.source_port = fast_ntoh(nf5_flow->src_port);
current_packet.destination_port = fast_ntoh(nf5_flow->dest_port);
// We do not support IPv6 in NetFlow v5 at all
current_packet.ip_protocol_version = 4;
switch (nf5_flow->protocol) {
case 1: {
// ICMP
current_packet.protocol = IPPROTO_ICMP;
} break;
case 6: {
// TCP
current_packet.protocol = IPPROTO_TCP;
// TODO: flags can be in another format!
current_packet.flags = nf5_flow->tcp_flags;
} break;
case 17: {
// UDP
current_packet.protocol = IPPROTO_UDP;
} break;
}
#ifdef ENABLE_LUA_HOOKS
if (lua_hooks_enabled) {
// This code could be used only for tests with pcap_reader
//if (lua_state == NULL) {
// init_lua_jit();
//}
if (call_lua_function("process_netflow", netflow_lua_state, client_addres_in_string_format, (void*)nf5_flow)) {
// We will process this packet
} else {
logger << log4cpp::Priority::INFO << "We will drop this packets because LUA script decided to do it";
return;
}
}
#endif
// Call processing function for every flow in packet
netflow_process_func_ptr(current_packet);
}
}
void process_netflow_packet(u_int8_t* packet, u_int len, std::string client_addres_in_string_format) {
struct NF_HEADER_COMMON* hdr = (struct NF_HEADER_COMMON*)packet;
switch (ntohs(hdr->version)) {
case 5:
process_netflow_packet_v5(packet, len, client_addres_in_string_format);
break;
case 9:
process_netflow_packet_v9(packet, len, client_addres_in_string_format);
break;
case 10:
process_netflow_packet_v10(packet, len, client_addres_in_string_format);
break;
default:
logger << log4cpp::Priority::ERROR << "We do not support this version of netflow "
<< ntohs(hdr->version);
break;
}
}
void start_netflow_collector(std::string netflow_host, unsigned int netflow_port);
// #include <sys/prctl.h>
void start_netflow_collection(process_packet_pointer func_ptr) {
logger << log4cpp::Priority::INFO << "netflow plugin started";
#ifdef ENABLE_LUA_HOOKS
if (lua_hooks_enabled) {
netflow_lua_state = init_lua_jit(lua_hooks_path);
if (netflow_lua_state == NULL) {
lua_hooks_enabled = false;
}
}
#endif
// prctl(PR_SET_NAME,"fastnetmon_netflow", 0, 0, 0);
netflow_process_func_ptr = func_ptr;
// By default we listen on IPv4
std::string netflow_host = "0.0.0.0";
std::string netflow_ports = "";
if (configuration_map.count("netflow_port") != 0) {
netflow_ports = configuration_map["netflow_port"];
}
if (configuration_map.count("netflow_host") != 0) {
netflow_host = configuration_map["netflow_host"];
}
if (configuration_map.count("netflow_sampling_ratio") != 0) {
sampling_rate = convert_string_to_integer(configuration_map["netflow_sampling_ratio"]);
logger << log4cpp::Priority::INFO << "Using custom sampling ratio for netflow: " << sampling_rate;
}
if (configuration_map.count("netflow_divide_counters_on_interval_length") != 0) {
netflow_divide_counters_on_interval_length =
configuration_map["netflow_divide_counters_on_interval_length"] == "on" ? true : false;
}
#ifdef ENABLE_LUA_HOOKS
if (configuration_map.count("netflow_lua_hooks_path") != 0) {
lua_hooks_path = configuration_map["netflow_lua_hooks_path"];
lua_hooks_enabled = true;
}
#endif
boost::thread_group netflow_collector_threads;
std::vector<std::string> ports_for_listen;
boost::split(ports_for_listen, netflow_ports, boost::is_any_of(","), boost::token_compress_on);
logger << log4cpp::Priority::INFO << netflow_plugin_log_prefix << "We will listen on " << ports_for_listen.size() << " ports";
for (std::vector<std::string>::iterator port = ports_for_listen.begin(); port != ports_for_listen.end(); ++port) {
unsigned int netflow_port = convert_string_to_integer(*port);
if (netflow_port == 0) {
netflow_port = 2055;
}
netflow_collector_threads.add_thread( new boost::thread(start_netflow_collector,
netflow_host,
convert_string_to_integer(*port)
));
}
netflow_collector_threads.join_all();
}
void start_netflow_collector(std::string netflow_host, unsigned int netflow_port) {
logger << log4cpp::Priority::INFO << "netflow plugin will listen on " << netflow_host << ":"
<< netflow_port << " udp port";
unsigned int udp_buffer_size = 65536;
char udp_buffer[udp_buffer_size];
struct addrinfo hints;
memset(&hints, 0, sizeof hints);
// Could be AF_INET6 or AF_INET
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
// This flag will generate wildcard IP address if we not specified certain IP address for
// binding
hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
struct addrinfo* servinfo = NULL;
const char* address_for_binding = NULL;
if (!netflow_host.empty()) {
address_for_binding = netflow_host.c_str();
}
char port_as_string[16];
sprintf(port_as_string, "%d", netflow_port);
int getaddrinfo_result = getaddrinfo(address_for_binding, port_as_string, &hints, &servinfo);
if (getaddrinfo_result != 0) {
logger << log4cpp::Priority::ERROR << "Netflow getaddrinfo function failed with code: " << getaddrinfo_result
<< " please check netflow_host";
exit(1);
}
int sockfd = socket(servinfo->ai_family, servinfo->ai_socktype, servinfo->ai_protocol);
int bind_result = bind(sockfd, servinfo->ai_addr, servinfo->ai_addrlen);
if (bind_result) {
logger << log4cpp::Priority::ERROR << "Can't listen on port: " << netflow_port << " on host "
<< netflow_host << " errno:" << errno << " error: " << strerror(errno);
return;
}
struct sockaddr_in6 peer;
memset(&peer, 0, sizeof(peer));
/* We should specify timeout there for correct toolkit shutdown */
/* Because otherwise recvfrom will stay in blocked mode forever */
struct timeval tv;
tv.tv_sec = 5; /* X Secs Timeout */
tv.tv_usec = 0; // Not init'ing this can cause strange errors
setsockopt(sockfd, SOL_SOCKET, SO_RCVTIMEO, (char *)&tv, sizeof(struct timeval));
while (true) {
// This approach provide ability to store both IPv4 and IPv6 client's addresses
struct sockaddr_storage client_address;
// It's MUST
memset(&client_address, 0, sizeof(struct sockaddr_storage));
socklen_t address_len = sizeof(struct sockaddr_storage);
int received_bytes =
recvfrom(sockfd, udp_buffer, udp_buffer_size, 0, (struct sockaddr*)&client_address, &address_len);
if (received_bytes > 0) {
// Pass host and port as numbers without any conversion
int getnameinfo_flags = NI_NUMERICSERV | NI_NUMERICHOST;
char host[NI_MAXHOST];
char service[NI_MAXSERV];
int result = getnameinfo((struct sockaddr*)&client_address, address_len, host,
NI_MAXHOST, service, NI_MAXSERV, getnameinfo_flags);
// We sill store client's IP address as string for allowing IPv4 and IPv6 processing in
// same time
std::string client_addres_in_string_format = std::string(host);
// logger<< log4cpp::Priority::INFO<<"We receive packet from IP:
// "<<client_addres_in_string_format;
// printf("We receive %d\n", received_bytes);
process_netflow_packet((u_int8_t*)udp_buffer, received_bytes, client_addres_in_string_format);
} else {
if (received_bytes == -1) {
if (errno == EAGAIN) {
// We got timeout, it's OK!
} else {
logger << log4cpp::Priority::ERROR << "netflow data receive failed";
}
}
}
// Add interruption point for correct application shutdown
boost::this_thread::interruption_point();
}
freeaddrinfo(servinfo);
}