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fastnetmon-ng/src/netflow_plugin/netflow_collector.cpp
2015-03-22 13:36:58 +03:00

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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 <vector>
#include <map>
#include "../fast_library.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"
// Get it from main programm
extern log4cpp::Category& logger;
// Global configuration map
extern std::map<std::string, std::string> configuration_map;
#include "netflow_collector.h"
#include "netflow.h"
// TODO: add per source uniq templates support
process_packet_pointer netflow_process_func_ptr = NULL;
std::map<u_int, struct peer_nf9_template> global_netflow9_templates_array;
std::map<u_int, struct peer_nf9_template> global_netflow10_templates_array;
/* Prototypes */
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_nf9_find_template(u_int32_t source_id, u_int template_id) {
// TODO: we ignore source_id !!! FIX IT
if (global_netflow9_templates_array.count(template_id) > 0) {
return &global_netflow9_templates_array[template_id];
} else {
return NULL;
}
}
struct peer_nf9_template* peer_nf10_find_template(u_int32_t source_id, u_int template_id) {
// TODO: we ignore source_id !!! FIX IT
if (global_netflow10_templates_array.count(template_id) > 0) {
return &global_netflow10_templates_array[template_id];
} else {
return NULL;
}
}
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";
buffer<<"type: "<<itr->type<<"\n";
buffer<<"len: "<<itr->len<<"\n\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 then 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) {
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;
if (peer_nf10_find_template(source_id, template_id) != NULL) {
//logger<< log4cpp::Priority::INFO<<"We already have information about this template with id:"<<template_id;
// TODO: update time to time template data
continue;
} else {
logger<< log4cpp::Priority::INFO<<"We got new template with ID: "<<template_id;
//logger<< log4cpp::Priority::INFO<<print_peer_nf9_template(field_template);
global_netflow10_templates_array[ template_id ] = field_template;
}
}
return 0;
}
int process_netflow_v9_template(u_int8_t *pkt, size_t len, u_int32_t source_id) {
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;
if (peer_nf9_find_template(source_id, template_id) != NULL) {
// logger<< log4cpp::Priority::INFO<<"We already have information about this template with id:"<<template_id;
// TODO: update time to time template data
continue;
} else {
global_netflow9_templates_array[ template_id ] = field_template;
}
}
return 0;
}
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) {
/* 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
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);
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 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;
packet.ts.tv_sec = ntohl(nf10_hdr->time_sec);
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);
offset += record_length;
}
// decode data in network byte order to host byte order
packet.length = ntohl(packet.length);
packet.number_of_packets = ntohl(packet.number_of_packets);
packet.protocol = ntohl(packet.protocol);
// 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 accoring to https://github.com/FastVPSEestiOu/fastnetmon/issues/147
//if (template->total_len > len)
// return 1;
u_int offset = 0;
simple_packet packet;
packet.ts.tv_sec = ntohl(nf9_hdr->time_sec);
// 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;
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;
offset += record_length;
}
// decode data in network byte order to host byte order
packet.length = ntohl(packet.length);
packet.number_of_packets = ntohl(packet.number_of_packets);
packet.protocol = ntohl(packet.protocol);
// 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) {
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);
if (flowset_template == NULL) {
logger<< log4cpp::Priority::INFO<<"We haven't template for flowset_id: "<<flowset_id
<<" but it's not an error if this message go away 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) {
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);
if (flowset_template == NULL) {
logger<< log4cpp::Priority::INFO<<"We haven't template for flowset_id: "<<flowset_id
<<" but it's not an error if this message go away 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 flowset, 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) {
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) != 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<<"I received ipfix options flowset id but I haven't support for it";
/* 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) != 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) {
//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) != 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) != 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) {
//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;
}
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);
// 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
// htobe64 removed
current_packet.length = ntohl(nf5_flow->flow_octets);
current_packet.number_of_packets = ntohl(nf5_flow->flow_packets);
// We did not support sampling for netflow :(
current_packet.sample_ratio = 1;
switch (nf5_flow->protocol) {
case 1: {
//ICMP
current_packet.protocol = IPPROTO_ICMP;
}
break;
case 6: {
// TCP
current_packet.protocol = IPPROTO_TCP;
current_packet.source_port = nf5_flow->src_port;
current_packet.destination_port = nf5_flow->dest_port;
// TODO: flags can be in another format!
current_packet.flags = nf5_flow->tcp_flags;
}
break;
case 17: {
// UDP
current_packet.protocol = IPPROTO_UDP;
current_packet.source_port = nf5_flow->src_port;
current_packet.destination_port = nf5_flow->dest_port;
}
break;
}
// 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) {
struct NF_HEADER_COMMON *hdr = (struct NF_HEADER_COMMON *)packet;
switch (ntohs(hdr->version)) {
case 5:
process_netflow_packet_v5(packet, len);
break;
case 9:
process_netflow_packet_v9(packet, len);
break;
case 10:
process_netflow_packet_v10(packet, len);
break;
default:
logger<< log4cpp::Priority::ERROR<<"We did not support this version of netflow "<<ntohs(hdr->version);
break;
}
}
unsigned int netflow_port = 2055;
void start_netflow_collection(process_packet_pointer func_ptr) {
logger<< log4cpp::Priority::INFO<<"netflow plugin started";
netflow_process_func_ptr = func_ptr;
std::string interface_for_binding = "0.0.0.0";
if (configuration_map.count("netflow_port") != 0) {
netflow_port = convert_string_to_integer(configuration_map["netflow_port"]);
}
if (configuration_map.count("netflow_host") != 0) {
interface_for_binding = configuration_map["netflow_host"];
}
logger<< log4cpp::Priority::INFO<<"netflow plugin will listen on "<<interface_for_binding<<":"<<netflow_port<< " udp port";
unsigned int udp_buffer_size = 65536;
char udp_buffer[udp_buffer_size];
int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
struct sockaddr_in servaddr;
memset(&servaddr, 0, sizeof(servaddr));
servaddr.sin_family = AF_INET;
if (interface_for_binding == "0.0.0.0") {
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
} else {
servaddr.sin_addr.s_addr = inet_addr(interface_for_binding.c_str());
}
servaddr.sin_port = htons(netflow_port);
int bind_result = bind(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr));
if (bind_result) {
logger<< log4cpp::Priority::ERROR<<"Can't listen port: "<<netflow_port;
return;
}
struct sockaddr_in6 peer;
memset(&peer, 0, sizeof(peer));
for (;;) {
struct sockaddr_in cliaddr;
socklen_t address_len = sizeof(cliaddr);
int received_bytes = recvfrom(sockfd, udp_buffer, udp_buffer_size, 0, (struct sockaddr *)&cliaddr, &address_len);
if (received_bytes > 0) {
// printf("We receive %d\n", received_bytes);
process_netflow_packet((u_int8_t*)udp_buffer, received_bytes);
} else {
logger<< log4cpp::Priority::ERROR<<"netflow data receive failed";
}
}
}
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