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-rw-r--r--examples/c-captured/c-captured.c1391
1 files changed, 1391 insertions, 0 deletions
diff --git a/examples/c-captured/c-captured.c b/examples/c-captured/c-captured.c
new file mode 100644
index 000000000..98df7c4b8
--- /dev/null
+++ b/examples/c-captured/c-captured.c
@@ -0,0 +1,1391 @@
+#include <arpa/inet.h>
+#include <errno.h>
+#include <linux/limits.h>
+#include <netinet/ip_icmp.h>
+#include <netinet/tcp.h>
+#include <netinet/udp.h>
+#include <pcap/pcap.h>
+#include <signal.h>
+#include <stdbool.h> // ndpi_typedefs.h
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <time.h>
+#include <unistd.h>
+
+#include <ndpi_typedefs.h>
+#include <ndpi_api.h>
+
+#include "nDPIsrvd.h"
+#include "utarray.h"
+#include "utils.h"
+
+// #define VERBOSE
+#define DEFAULT_DATADIR "/tmp/nDPId-captured"
+
+struct packet_data
+{
+ nDPIsrvd_ull error_event_id;
+ nDPIsrvd_ull packet_id;
+ nDPIsrvd_ull packet_datalink;
+ nDPIsrvd_ull packet_ts_sec;
+ nDPIsrvd_ull packet_ts_usec;
+ nDPIsrvd_ull packet_len;
+ int base64_packet_size;
+ union
+ {
+ char * base64_packet;
+ char const * base64_packet_const;
+ };
+};
+
+struct flow_packet_data
+{
+ nDPIsrvd_ull packet_ts_sec;
+ nDPIsrvd_ull packet_ts_usec;
+ nDPIsrvd_ull packet_len;
+ int base64_packet_size;
+ union
+ {
+ char * base64_packet;
+ char const * base64_packet_const;
+ };
+};
+
+struct global_user_data
+{
+ UT_array * packets; // packet_data
+};
+
+struct flow_user_data
+{
+ uint8_t new_seen : 1;
+ uint8_t detection_finished : 1;
+ uint8_t guessed : 1;
+ uint8_t detected : 1;
+ uint8_t risky : 1;
+ uint8_t midstream : 1;
+ nDPIsrvd_ull flow_datalink;
+ nDPIsrvd_ull flow_max_packets;
+ nDPIsrvd_ull flow_tot_l4_payload_len;
+ UT_array * packets; // flow_packet_data
+};
+
+static struct nDPIsrvd_socket * ndpisrvd_socket = NULL;
+static int main_thread_shutdown = 0;
+
+static char * pidfile = NULL;
+static char * serv_optarg = NULL;
+static nDPIsrvd_ull pcap_filename_rotation = 0;
+static time_t pcap_filename_last_rotation = 0;
+static struct tm pcap_filename_last_rotation_tm = {};
+static char * user = NULL;
+static char * group = NULL;
+static uint8_t logging_mode = 0;
+static uint8_t capture_mode = 0;
+static char * datadir = NULL;
+static uint8_t process_guessed = 0;
+static uint8_t process_undetected = 0;
+static ndpi_risk process_risky = NDPI_NO_RISK;
+static uint8_t process_midstream = 0;
+static uint8_t ignore_empty_flows = 0;
+
+size_t const max_packet_len = 65535;
+
+#ifdef ENABLE_MEMORY_PROFILING
+void nDPIsrvd_memprof_log_alloc(size_t alloc_size)
+{
+ (void)alloc_size;
+}
+
+void nDPIsrvd_memprof_log_free(size_t free_size)
+{
+ (void)free_size;
+}
+
+void nDPIsrvd_memprof_log(char const * const format, ...)
+{
+ va_list ap;
+
+ va_start(ap, format);
+ fprintf(stderr, "%s", "nDPIsrvd MemoryProfiler: ");
+ vfprintf(stderr, format, ap);
+ fprintf(stderr, "%s\n", "");
+ va_end(ap);
+}
+#endif
+
+static int pcap_open_or_append(int packet_datalink,
+ const char * const filename,
+ pcap_t ** const p,
+ pcap_dumper_t ** const pd)
+{
+ *p = pcap_open_dead(packet_datalink, max_packet_len);
+ if (*p == NULL)
+ {
+ return 1;
+ }
+
+ if (access(filename, F_OK) == 0)
+ {
+ *pd = pcap_dump_open_append(*p, filename);
+ }
+ else
+ {
+ *pd = pcap_dump_open(*p, filename);
+ }
+
+ if (*pd == NULL)
+ {
+ logger(1, "pcap error %s", pcap_geterr(*p));
+ pcap_close(*p);
+ return 1;
+ }
+
+ return 0;
+}
+
+static void decode_base64(pcap_dumper_t * const pd,
+ struct packet_data * const pd_elt,
+ struct flow_packet_data * const fd_elt)
+{
+ char const * base64_packet;
+ size_t base64_packet_size;
+ nDPIsrvd_ull packet_ts_sec, packet_ts_usec;
+ unsigned char pkt_buf[max_packet_len];
+ size_t pkt_buf_len = sizeof(pkt_buf);
+
+ if (pd_elt != NULL)
+ {
+ base64_packet = pd_elt->base64_packet;
+ base64_packet_size = pd_elt->base64_packet_size;
+ packet_ts_sec = pd_elt->packet_ts_sec;
+ packet_ts_usec = pd_elt->packet_ts_usec;
+ }
+ else if (fd_elt != NULL)
+ {
+ base64_packet = fd_elt->base64_packet;
+ base64_packet_size = fd_elt->base64_packet_size;
+ packet_ts_sec = fd_elt->packet_ts_sec;
+ packet_ts_usec = fd_elt->packet_ts_usec;
+ }
+ else
+ {
+ logger(1, "%s", "BUG: Can not decode base64 packet.");
+ return;
+ }
+
+ if (nDPIsrvd_base64decode(base64_packet, base64_packet_size, pkt_buf, &pkt_buf_len) != 0 || pkt_buf_len == 0)
+ {
+ logger(1, "packet base64 decode failed (%zu bytes): %s", base64_packet_size, base64_packet);
+ }
+ else
+ {
+ struct pcap_pkthdr phdr;
+ phdr.ts.tv_sec = packet_ts_sec;
+ phdr.ts.tv_usec = packet_ts_usec;
+ phdr.caplen = pkt_buf_len;
+ phdr.len = pkt_buf_len;
+ pcap_dump((unsigned char *)pd, &phdr, pkt_buf);
+ }
+}
+
+static void packet_data_copy(void * dst, const void * src)
+{
+ struct packet_data * const pd_dst = (struct packet_data *)dst;
+ struct packet_data const * const pd_src = (struct packet_data *)src;
+ *pd_dst = *pd_src;
+ if (pd_src->base64_packet != NULL && pd_src->base64_packet_size > 0)
+ {
+ pd_dst->base64_packet = strndup(pd_src->base64_packet, pd_src->base64_packet_size);
+ }
+ else
+ {
+ pd_dst->base64_packet = NULL;
+ pd_dst->base64_packet_size = 0;
+ }
+}
+
+static void packet_data_dtor(void * elt)
+{
+ struct packet_data * const pd_elt = (struct packet_data *)elt;
+ if (pd_elt->base64_packet != NULL)
+ {
+ free(pd_elt->base64_packet);
+ pd_elt->base64_packet = NULL;
+ pd_elt->base64_packet_size = 0;
+ }
+}
+
+static void flow_packet_data_copy(void * dst, const void * src)
+{
+ struct flow_packet_data * const pd_dst = (struct flow_packet_data *)dst;
+ struct flow_packet_data const * const pd_src = (struct flow_packet_data *)src;
+ *pd_dst = *pd_src;
+ if (pd_src->base64_packet != NULL && pd_src->base64_packet_size > 0)
+ {
+ pd_dst->base64_packet = strndup(pd_src->base64_packet, pd_src->base64_packet_size);
+ }
+ else
+ {
+ pd_dst->base64_packet = NULL;
+ pd_dst->base64_packet_size = 0;
+ }
+}
+
+static void flow_packet_data_dtor(void * elt)
+{
+ struct flow_packet_data * const pd_elt = (struct flow_packet_data *)elt;
+ if (pd_elt->base64_packet != NULL)
+ {
+ free(pd_elt->base64_packet);
+ pd_elt->base64_packet = NULL;
+ pd_elt->base64_packet_size = 0;
+ }
+}
+
+static const UT_icd packet_data_icd = {sizeof(struct packet_data), NULL, packet_data_copy, packet_data_dtor};
+static const UT_icd flow_packet_data_icd = {sizeof(struct flow_packet_data),
+ NULL,
+ flow_packet_data_copy,
+ flow_packet_data_dtor};
+
+static int utarray_packets_init(struct global_user_data * const global_user)
+{
+ if (capture_mode == 0)
+ {
+ return -1;
+ }
+
+ if (global_user->packets == NULL)
+ {
+ utarray_new(global_user->packets, &packet_data_icd);
+ }
+
+ return global_user->packets != NULL;
+}
+
+static void utarray_packets_free(struct global_user_data * const global_user)
+{
+ if (capture_mode == 0)
+ {
+ return;
+ }
+
+ if (global_user->packets != NULL)
+ {
+ utarray_free(global_user->packets);
+ global_user->packets = NULL;
+ }
+}
+
+static int utarray_packets_add(struct global_user_data * const global_user, struct packet_data const * const pd)
+{
+ if (capture_mode == 0)
+ {
+ return -1;
+ }
+
+ unsigned int array_len = utarray_len(global_user->packets);
+
+ utarray_push_back(global_user->packets, pd);
+
+ return utarray_len(global_user->packets) == array_len + 1u;
+}
+
+static struct packet_data * utarray_packets_get(struct global_user_data * const global_user, nDPIsrvd_ull packet_id)
+{
+ if (capture_mode == 0)
+ {
+ return NULL;
+ }
+
+ for (size_t i = 0; i < utarray_len(global_user->packets); ++i)
+ {
+ struct packet_data * const pd_elt = (struct packet_data *)utarray_eltptr(global_user->packets, i);
+
+ if (pd_elt->packet_id == packet_id)
+ {
+ return pd_elt;
+ }
+ }
+
+ return NULL;
+}
+
+static int utarray_flow_packets_init(struct flow_user_data * const flow_user)
+{
+ if (capture_mode == 0)
+ {
+ return -1;
+ }
+
+ if (flow_user->packets == NULL)
+ {
+ utarray_new(flow_user->packets, &flow_packet_data_icd);
+ }
+
+ return flow_user->packets != NULL;
+}
+
+static void utarray_flow_packets_free(struct flow_user_data * const flow_user)
+{
+ if (capture_mode == 0)
+ {
+ return;
+ }
+
+ if (flow_user->packets != NULL)
+ {
+ utarray_free(flow_user->packets);
+ flow_user->packets = NULL;
+ }
+}
+
+static int utarray_flow_packets_add(struct flow_user_data * const flow_user, struct flow_packet_data const * const pd)
+{
+ if (capture_mode == 0)
+ {
+ return -1;
+ }
+
+ unsigned int array_len = utarray_len(flow_user->packets);
+
+ utarray_push_back(flow_user->packets, pd);
+
+ return utarray_len(flow_user->packets) == array_len + 1u;
+}
+
+static void set_ndpi_risk(ndpi_risk * const risk, nDPIsrvd_ull risk_to_add)
+{
+ if (risk_to_add == 0)
+ {
+ *risk = (ndpi_risk)-1;
+ }
+ else
+ {
+ *risk |= 1ull << --risk_to_add;
+ }
+}
+
+static void unset_ndpi_risk(ndpi_risk * const risk, nDPIsrvd_ull risk_to_del)
+{
+ if (risk_to_del == 0)
+ {
+ *risk = 0;
+ }
+ else
+ {
+ *risk &= ~(1ull << --risk_to_del);
+ }
+}
+
+static int has_ndpi_risk(ndpi_risk * const risk, nDPIsrvd_ull risk_to_check)
+{
+ return (*risk & (1ull << --risk_to_check)) != 0;
+}
+
+static int generate_pcap_appendix(char * const appendix, size_t appendix_size)
+{
+ if (pcap_filename_rotation > 0)
+ {
+ time_t current_time = time(NULL);
+
+ if (current_time >= pcap_filename_last_rotation + (time_t)pcap_filename_rotation)
+ {
+ pcap_filename_last_rotation = current_time;
+ if (localtime_r(&pcap_filename_last_rotation, &pcap_filename_last_rotation_tm) == NULL)
+ {
+ return 1;
+ }
+ }
+
+ if (strftime(appendix, appendix_size, "-%d_%m_%y-%H_%M_%S", &pcap_filename_last_rotation_tm) == 0)
+ {
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+static char * packet_generate_pcap_filename(char * const dest, size_t size, nDPIsrvd_ull packet_datalink)
+{
+ char appendix[32] = {};
+
+ if (generate_pcap_appendix(appendix, sizeof(appendix)) != 0)
+ {
+ return NULL;
+ }
+
+ int ret = snprintf(dest, size, "%s/packet%s-dlt%llu.pcap", datadir, appendix, packet_datalink);
+ if (ret <= 0 || (size_t)ret > size)
+ {
+ return NULL;
+ }
+
+ return dest;
+}
+
+static char * flow_generate_pcap_filename(struct flow_user_data const * const flow_user, char * const dest, size_t size)
+{
+ char appendix[32] = {};
+
+ if (generate_pcap_appendix(appendix, sizeof(appendix)) != 0)
+ {
+ return NULL;
+ }
+
+ if (flow_user->guessed != 0 || flow_user->detected == 0 || flow_user->risky != 0 || flow_user->midstream != 0)
+ {
+ char const * flow_type = NULL;
+
+ if (flow_user->midstream != 0)
+ {
+ flow_type = "midstream";
+ }
+ else if (flow_user->guessed != 0)
+ {
+ flow_type = "guessed";
+ }
+ else if (flow_user->detected == 0)
+ {
+ flow_type = "undetected";
+ }
+ else if (flow_user->risky != 0)
+ {
+ flow_type = "risky";
+ }
+ else
+ {
+ flow_type = "unknown-type";
+ }
+
+ int ret = snprintf(dest, size, "%s/flow-%s%s.pcap", datadir, flow_type, appendix);
+ if (ret <= 0 || (size_t)ret > size)
+ {
+ return NULL;
+ }
+ }
+ else
+ {
+ return NULL;
+ }
+
+ return dest;
+}
+
+static int packet_write_pcap_file(struct global_user_data const * const global_user)
+{
+ UT_array * const pd_array = global_user->packets;
+
+ if (utarray_len(pd_array) == 0)
+ {
+ logger(0, "Can not dump packets to pcap; packet array empty");
+ return 1;
+ }
+
+ while (utarray_len(pd_array) > 0)
+ {
+ struct packet_data * const pd_elt = (struct packet_data *)utarray_front(pd_array);
+ if (pd_elt == NULL)
+ {
+ return 1;
+ }
+ nDPIsrvd_ull packet_datalink = pd_elt->packet_datalink;
+
+ char filename[PATH_MAX];
+ if (packet_generate_pcap_filename(filename, sizeof(filename), packet_datalink) == NULL)
+ {
+ logger(1, "%s", "Internal error. Could not generate PCAP filename, exit ..");
+ return 1;
+ }
+
+ pcap_t * p = NULL;
+ pcap_dumper_t * pd = NULL;
+ if (pcap_open_or_append(packet_datalink, filename, &p, &pd) != 0)
+ {
+ logger(1, "Can not dump packets to pcap; file open/append failed");
+ return 1;
+ }
+
+ for (size_t i = 0; i < utarray_len(pd_array); ++i)
+ {
+ struct packet_data * const pd_elt_dmp = (struct packet_data *)utarray_eltptr(pd_array, i);
+ if (pd_elt_dmp == NULL)
+ {
+ return 1;
+ }
+
+ decode_base64(pd, pd_elt_dmp, NULL);
+ }
+#ifdef VERBOSE
+ printf("packets dumped to %s\n", filename);
+#endif
+ pcap_dump_close(pd);
+ pcap_close(p);
+
+ size_t i = 0;
+ while (utarray_len(pd_array) > 0)
+ {
+ struct packet_data * const pd_elt_rm = (struct packet_data *)utarray_eltptr(pd_array, i);
+ if (pd_elt_rm == NULL)
+ {
+ return 1;
+ }
+
+ if (pd_elt_rm->packet_datalink == packet_datalink)
+ {
+#ifdef VERBOSE
+ printf("Remove packet index %zu with datalink %llu\n", i, packet_datalink);
+#endif
+ utarray_erase(pd_array, i, 1);
+ }
+ else
+ {
+ i++;
+ }
+ }
+ }
+
+ return 0;
+}
+
+static int flow_write_pcap_file(struct flow_user_data const * const flow_user, char const * const filename)
+{
+ UT_array const * const pd_array = flow_user->packets;
+ int packet_datalink = flow_user->flow_datalink;
+ pcap_t * p = NULL;
+ pcap_dumper_t * pd = NULL;
+
+ if (utarray_len(pd_array) == 0)
+ {
+ logger(1, "Can not dump flow packets to pcap; flow packet array empty");
+ return 0;
+ }
+
+ if (pcap_open_or_append(packet_datalink, filename, &p, &pd) != 0)
+ {
+ logger(1, "Can not dump flow packets to pcap; file open/append failed");
+ return 0;
+ }
+
+ struct flow_packet_data * pd_elt = (struct flow_packet_data *)utarray_front(pd_array);
+ do
+ {
+ if (pd_elt == NULL)
+ {
+ break;
+ }
+
+ decode_base64(pd, NULL, pd_elt);
+ } while ((pd_elt = (struct flow_packet_data *)utarray_next(pd_array, pd_elt)) != NULL);
+
+ pcap_dump_close(pd);
+ pcap_close(p);
+
+ return 0;
+}
+
+#ifdef VERBOSE
+static void flow_packet_data_print(struct flow_user_data const * const flow_user)
+{
+ UT_array const * const pd_array = flow_user->packets;
+
+ printf("packet-data array size(): %u\n", pd_array->n);
+ struct flow_packet_data * pd_elt = (struct flow_packet_data *)utarray_front(pd_array);
+ do
+ {
+ if (pd_elt == NULL)
+ {
+ break;
+ }
+ printf("\tpacket-data base64 length: %d\n", pd_elt->base64_packet_size);
+ } while ((pd_elt = (struct flow_packet_data *)utarray_next(pd_array, pd_elt)) != NULL);
+}
+#else
+#define flow_packet_data_print(pd_array)
+#endif
+
+static enum nDPIsrvd_conversion_return perror_ull(enum nDPIsrvd_conversion_return retval, char const * const prefix)
+{
+ switch (retval)
+ {
+ case CONVERSION_OK:
+ break;
+
+ case CONVERISON_KEY_NOT_FOUND:
+ logger(1, "%s: Key not found.", prefix);
+ break;
+ case CONVERSION_NOT_A_NUMBER:
+ logger(1, "%s: Not a valid number.", prefix);
+ break;
+ case CONVERSION_RANGE_EXCEEDED:
+ logger(1, "%s: Number too large.", prefix);
+ break;
+
+ default:
+ logger(1, "Internal error, invalid conversion return value.");
+ break;
+ }
+
+ return retval;
+}
+
+static void log_event(struct nDPIsrvd_socket const * const sock,
+ struct nDPIsrvd_flow * const flow,
+ char const * const event_name)
+{
+ struct nDPIsrvd_json_token const * const src_ip = TOKEN_GET_SZ(sock, "src_ip");
+ struct nDPIsrvd_json_token const * const dst_ip = TOKEN_GET_SZ(sock, "dst_ip");
+ struct nDPIsrvd_json_token const * const l4_proto = TOKEN_GET_SZ(sock, "l4_proto");
+ struct nDPIsrvd_json_token const * const src_port = TOKEN_GET_SZ(sock, "src_port");
+ struct nDPIsrvd_json_token const * const dst_port = TOKEN_GET_SZ(sock, "dst_port");
+ char const *src_ip_str = NULL, *dst_ip_str = NULL, *l4_proto_str = NULL;
+ size_t src_ip_len, dst_ip_len, l4_proto_len;
+ char src_port_str[8] = {}, dst_port_str[8] = {};
+ char const * const na = "n/a";
+ const int na_len = (int)strlen(na);
+
+ if (src_ip == NULL || dst_ip == NULL)
+ {
+ logger(1, "Flow %llu: Missing essential source/destination IP address.", flow->id_as_ull);
+ }
+ else
+ {
+ src_ip_str = TOKEN_GET_VALUE(sock, src_ip, &src_ip_len);
+ dst_ip_str = TOKEN_GET_VALUE(sock, dst_ip, &dst_ip_len);
+ }
+ if (l4_proto != NULL)
+ {
+ l4_proto_str = TOKEN_GET_VALUE(sock, l4_proto, &l4_proto_len);
+ }
+ if (src_port != NULL && dst_port != NULL)
+ {
+ size_t src_port_len = 0;
+ size_t dst_port_len = 0;
+ char const * const tmp_src_port_str = TOKEN_GET_VALUE(sock, src_port, &src_port_len);
+ char const * const tmp_dst_port_str = TOKEN_GET_VALUE(sock, dst_port, &dst_port_len);
+ if (tmp_src_port_str != NULL && tmp_dst_port_str != NULL)
+ {
+ snprintf(src_port_str, nDPIsrvd_ARRAY_LENGTH(src_port_str), ":%.*s", (int)src_port_len, tmp_src_port_str);
+ snprintf(dst_port_str, nDPIsrvd_ARRAY_LENGTH(dst_port_str), ":%.*s", (int)dst_port_len, tmp_dst_port_str);
+ }
+ }
+
+ if (is_console_logger_enabled() != 0)
+ {
+ printf("Flow %llu %s: %.*s %.*s%s -> %.*s%s\n",
+ flow->id_as_ull,
+ event_name,
+ (l4_proto_str != NULL ? (int)l4_proto_len : na_len),
+ (l4_proto_str != NULL ? l4_proto_str : na),
+ (src_ip_str != NULL ? (int)src_ip_len : na_len),
+ (src_ip_str != NULL ? src_ip_str : na),
+ src_port_str,
+ (dst_ip_str != NULL ? (int)dst_ip_len : na_len),
+ (dst_ip_str != NULL ? dst_ip_str : na),
+ dst_port_str);
+ }
+ else
+ {
+ logger(0,
+ "Flow %llu %s: %.*s %.*s%s -> %.*s%s",
+ flow->id_as_ull,
+ event_name,
+ (l4_proto_str != NULL ? (int)l4_proto_len : na_len),
+ (l4_proto_str != NULL ? l4_proto_str : na),
+ (src_ip_str != NULL ? (int)src_ip_len : na_len),
+ (src_ip_str != NULL ? src_ip_str : na),
+ src_port_str,
+ (dst_ip_str != NULL ? (int)dst_ip_len : na_len),
+ (dst_ip_str != NULL ? dst_ip_str : na),
+ dst_port_str);
+ }
+}
+
+static enum nDPIsrvd_callback_return captured_json_callback(struct nDPIsrvd_socket * const sock,
+ struct nDPIsrvd_instance * const instance,
+ struct nDPIsrvd_thread_data * const thread_data,
+ struct nDPIsrvd_flow * const flow)
+{
+ (void)instance;
+ (void)thread_data;
+
+ struct global_user_data * const global_user = (struct global_user_data *)&sock->global_user_data[0];
+
+ if (flow == NULL)
+ {
+ nDPIsrvd_ull packet_id = 0ull;
+ perror_ull(TOKEN_VALUE_TO_ULL(sock, TOKEN_GET_SZ(sock, "packet_id"), &packet_id), "packet_id");
+
+ if (utarray_packets_init(global_user) == 0)
+ {
+ logger(1, "Memory allocation for packet data failed.");
+ return CALLBACK_ERROR;
+ }
+
+ if (TOKEN_GET_SZ(sock, "error_event_name") != NULL)
+ {
+ logger(1, "Received an error event for packet id %llu.", packet_id);
+
+ if (TOKEN_GET_SZ(sock, "error_event_id") == NULL)
+ {
+ logger(1, "Missing error event id.");
+ return CALLBACK_ERROR;
+ }
+
+ nDPIsrvd_ull error_event_id = 0;
+ TOKEN_VALUE_TO_ULL(sock, TOKEN_GET_SZ(sock, "error_event_id"), &error_event_id);
+ struct packet_data pd = {.error_event_id = error_event_id, .packet_id = packet_id};
+ if (utarray_packets_add(global_user, &pd) == 0)
+ {
+ logger(1, "Could not add packet to array with id %llu.", packet_id);
+ return CALLBACK_ERROR;
+ }
+ }
+ else if (TOKEN_VALUE_EQUALS_SZ(sock, TOKEN_GET_SZ(sock, "packet_event_name"), "packet") != 0)
+ {
+ logger(1, "Received an packet event for packet id %llu.", packet_id);
+
+ if (capture_mode != 0)
+ {
+ struct packet_data * const pd = utarray_packets_get(global_user, packet_id);
+ if (pd == NULL)
+ {
+ logger(1, "Received an packet event w/o a previous error event for packet id %llu.", packet_id);
+ return CALLBACK_OK;
+ }
+
+ if (pd->packet_id != packet_id)
+ {
+ logger(1,
+ "Received a packet event with a different packet id then the one seen in the error event: "
+ "%llu != %llu.",
+ packet_id,
+ pd->packet_id);
+ return CALLBACK_OK;
+ }
+
+ struct nDPIsrvd_json_token const * const pkt = TOKEN_GET_SZ(sock, "pkt");
+ if (pkt == NULL)
+ {
+ logger(1, "%s", "No packet data available.");
+ logger(1,
+ "JSON message: '%.*s'",
+ nDPIsrvd_json_buffer_length(sock),
+ nDPIsrvd_json_buffer_string(sock));
+ return CALLBACK_OK;
+ }
+
+ perror_ull(TOKEN_VALUE_TO_ULL(sock, TOKEN_GET_SZ(sock, "pkt_datalink"), &pd->packet_datalink),
+ "pkt_datalink");
+
+ nDPIsrvd_ull thread_ts_usec = 0ull;
+ perror_ull(TOKEN_VALUE_TO_ULL(sock, TOKEN_GET_SZ(sock, "thread_ts_usec"), &thread_ts_usec),
+ "thread_ts_usec");
+
+ nDPIsrvd_ull pkt_len = 0ull;
+ perror_ull(TOKEN_VALUE_TO_ULL(sock, TOKEN_GET_SZ(sock, "pkt_caplen"), &pkt_len), "pkt_caplen");
+
+ pd->packet_ts_sec = thread_ts_usec / (1000 * 1000);
+ pd->packet_ts_usec = (thread_ts_usec % (1000 * 1000));
+ pd->packet_len = pkt_len;
+ pd->base64_packet_size = nDPIsrvd_get_token_size(sock, pkt);
+ pd->base64_packet_const = strndup(nDPIsrvd_get_token_value(sock, pkt), pd->base64_packet_size);
+
+ if (packet_write_pcap_file(global_user) != 0)
+ {
+ logger(1, "%s", "Could not dump non-flow packet data");
+ return CALLBACK_OK;
+ }
+ }
+
+ utarray_packets_free(global_user);
+ }
+
+ return CALLBACK_OK;
+ }
+
+ struct flow_user_data * const flow_user = (struct flow_user_data *)flow->flow_user_data;
+
+ if (flow_user == NULL || flow_user->detection_finished != 0)
+ {
+ return CALLBACK_OK;
+ }
+
+ if (TOKEN_VALUE_EQUALS_SZ(sock, TOKEN_GET_SZ(sock, "flow_state"), "finished") != 0)
+ {
+ flow_user->detection_finished = 1;
+ }
+
+ if (TOKEN_VALUE_EQUALS_SZ(sock, TOKEN_GET_SZ(sock, "packet_event_name"), "packet-flow") != 0)
+ {
+ struct nDPIsrvd_json_token const * const pkt = TOKEN_GET_SZ(sock, "pkt");
+ if (pkt == NULL)
+ {
+ logger(1, "%s", "No packet data available.");
+ logger(1, "JSON message: '%.*s'", nDPIsrvd_json_buffer_length(sock), nDPIsrvd_json_buffer_string(sock));
+ return CALLBACK_OK;
+ }
+
+ if (utarray_flow_packets_init(flow_user) == 0)
+ {
+ logger(1, "%s", "Memory allocation for captured packets failed.");
+ return CALLBACK_ERROR;
+ }
+
+ nDPIsrvd_ull thread_ts_usec = 0ull;
+ perror_ull(TOKEN_VALUE_TO_ULL(sock, TOKEN_GET_SZ(sock, "thread_ts_usec"), &thread_ts_usec), "thread_ts_usec");
+
+ nDPIsrvd_ull pkt_len = 0ull;
+ perror_ull(TOKEN_VALUE_TO_ULL(sock, TOKEN_GET_SZ(sock, "pkt_caplen"), &pkt_len), "pkt_caplen");
+
+ struct flow_packet_data pd = {.packet_ts_sec = thread_ts_usec / (1000 * 1000),
+ .packet_ts_usec = (thread_ts_usec % (1000 * 1000)),
+ .packet_len = pkt_len,
+ .base64_packet_size = nDPIsrvd_get_token_size(sock, pkt),
+ .base64_packet_const = nDPIsrvd_get_token_value(sock, pkt)};
+ if (utarray_flow_packets_add(flow_user, &pd) == 0)
+ {
+ logger(1, "%s", "Memory allocation to add a captured packet failed.");
+ return CALLBACK_ERROR;
+ }
+ }
+
+ {
+ struct nDPIsrvd_json_token const * const flow_event_name = TOKEN_GET_SZ(sock, "flow_event_name");
+
+ if (flow_event_name != NULL)
+ {
+ nDPIsrvd_ull nmb = 0;
+
+ perror_ull(TOKEN_VALUE_TO_ULL(sock, TOKEN_GET_SZ(sock, "flow_src_tot_l4_payload_len"), &nmb),
+ "flow_src_tot_l4_payload_len");
+ flow_user->flow_tot_l4_payload_len += nmb;
+
+ nmb = 0;
+
+ perror_ull(TOKEN_VALUE_TO_ULL(sock, TOKEN_GET_SZ(sock, "flow_dst_tot_l4_payload_len"), &nmb),
+ "flow_dst_tot_l4_payload_len");
+ flow_user->flow_tot_l4_payload_len += nmb;
+ }
+
+ if (TOKEN_VALUE_EQUALS_SZ(sock, flow_event_name, "new") != 0)
+ {
+ flow_user->new_seen = 1;
+
+ perror_ull(TOKEN_VALUE_TO_ULL(sock, TOKEN_GET_SZ(sock, "flow_datalink"), &flow_user->flow_datalink),
+ "flow_datalink");
+ perror_ull(TOKEN_VALUE_TO_ULL(sock, TOKEN_GET_SZ(sock, "flow_max_packets"), &flow_user->flow_max_packets),
+ "flow_max_packets");
+ if (TOKEN_VALUE_EQUALS_SZ(sock, TOKEN_GET_SZ(sock, "midstream"), "1") != 0)
+ {
+ flow_user->midstream = 1;
+ }
+
+ return CALLBACK_OK;
+ }
+ else if (flow_user->new_seen == 0)
+ {
+ return CALLBACK_OK;
+ }
+ else if (TOKEN_VALUE_EQUALS_SZ(sock, flow_event_name, "guessed") != 0)
+ {
+ flow_user->guessed = 1;
+ }
+ else if (TOKEN_VALUE_EQUALS_SZ(sock, flow_event_name, "not-detected") != 0)
+ {
+ flow_user->detected = 0;
+ flow_user->detection_finished = 1;
+ }
+ else if (TOKEN_VALUE_EQUALS_SZ(sock, flow_event_name, "detected") != 0 ||
+ TOKEN_VALUE_EQUALS_SZ(sock, flow_event_name, "detection-update"))
+ {
+ struct nDPIsrvd_json_token const * const flow_risk = TOKEN_GET_SZ(sock, "ndpi", "flow_risk");
+ struct nDPIsrvd_json_token const * current = NULL;
+ int next_child_index = -1;
+
+ flow_user->detected = 1;
+
+ if (flow_risk != NULL)
+ {
+ while ((current = nDPIsrvd_get_next_token(sock, flow_risk, &next_child_index)) != NULL)
+ {
+ nDPIsrvd_ull numeric_risk_value = (nDPIsrvd_ull)-1;
+
+ if (str_value_to_ull(TOKEN_GET_KEY(sock, current, NULL), &numeric_risk_value) == CONVERSION_OK &&
+ numeric_risk_value < NDPI_MAX_RISK && has_ndpi_risk(&process_risky, numeric_risk_value) != 0)
+ {
+ flow_user->risky = 1;
+ }
+ }
+ }
+ }
+
+ if (flow_user->detection_finished != 0 &&
+ ((flow_user->guessed != 0 && process_guessed != 0) ||
+ (flow_user->detected == 0 && process_undetected != 0) || (flow_user->risky != 0 && process_risky != 0) ||
+ (flow_user->midstream != 0 && process_midstream != 0)))
+ {
+ if (flow_user->guessed != 0 && flow_user->detected != 0)
+ {
+ log_event(sock, flow, "BUG: guessed and detected at the same time");
+ }
+
+ if (logging_mode != 0)
+ {
+ if (flow_user->guessed != 0)
+ log_event(sock, flow, "guessed");
+ if (flow_user->detected == 0)
+ log_event(sock, flow, "not-detected");
+ if (flow_user->risky != 0)
+ log_event(sock, flow, "risky");
+ if (flow_user->midstream != 0)
+ log_event(sock, flow, "midstream");
+ }
+
+ if (flow_user->packets == NULL || flow_user->flow_max_packets == 0 || utarray_len(flow_user->packets) == 0)
+ {
+ if (capture_mode != 0)
+ {
+ log_event(sock, flow, "No packets captured");
+ }
+ }
+ else if (capture_mode != 0)
+ {
+ flow_packet_data_print(flow_user);
+ if (ignore_empty_flows == 0 || flow_user->flow_tot_l4_payload_len > 0)
+ {
+ char pcap_filename[PATH_MAX];
+ if (flow_generate_pcap_filename(flow_user, pcap_filename, sizeof(pcap_filename)) == NULL)
+ {
+ log_event(sock, flow, "Internal error. Could not generate PCAP filename, exit ..");
+ return CALLBACK_ERROR;
+ }
+#ifdef VERBOSE
+ printf("Flow %llu saved to %s\n", flow->id_as_ull, pcap_filename);
+#endif
+ errno = 0;
+ if (flow_write_pcap_file(flow_user, pcap_filename) != 0)
+ {
+ logger(1, "Could not dump packet data to pcap file %s: %s", pcap_filename, strerror(errno));
+ return CALLBACK_OK;
+ }
+ }
+ }
+
+ utarray_flow_packets_free(flow_user);
+ }
+ }
+
+ return CALLBACK_OK;
+}
+
+static void nDPIsrvd_write_flow_info_cb(struct nDPIsrvd_socket const * sock,
+ struct nDPIsrvd_instance const * instance,
+ struct nDPIsrvd_thread_data const * thread_data,
+ struct nDPIsrvd_flow const * flow,
+ void * user_data)
+{
+ (void)sock;
+ (void)instance;
+ (void)thread_data;
+ (void)user_data;
+
+ struct flow_user_data const * const flow_user = (struct flow_user_data const *)flow->flow_user_data;
+
+ fprintf(stderr,
+ "[Flow %4llu][ptr: "
+#ifdef __LP64__
+ "0x%016llx"
+#else
+ "0x%08lx"
+#endif
+ "][last-seen: %13llu][finished: %u][detected: %u][risky: "
+ "%u][total-L4-payload-length: "
+ "%4llu][packets-captured: %u]\n",
+ flow->id_as_ull,
+#ifdef __LP64__
+ (unsigned long long int)flow,
+#else
+ (unsigned long int)flow,
+#endif
+ flow->last_seen,
+ flow_user->detection_finished,
+ flow_user->detected,
+ flow_user->risky,
+ flow_user->flow_tot_l4_payload_len,
+ flow_user->packets != NULL ? utarray_len(flow_user->packets) : 0);
+
+ logger(0,
+ "[Flow %4llu][ptr: "
+#ifdef __LP64__
+ "0x%016llx"
+#else
+ "0x%08lx"
+#endif
+ "][last-seen: %13llu][finished: %u][detected: %u][risky: "
+ "%u][total-L4-payload-length: "
+ "%4llu][packets-captured: %u]",
+ flow->id_as_ull,
+#ifdef __LP64__
+ (unsigned long long int)flow,
+#else
+ (unsigned long int)flow,
+#endif
+ flow->last_seen,
+ flow_user->detection_finished,
+ flow_user->detected,
+ flow_user->risky,
+ flow_user->flow_tot_l4_payload_len,
+ flow_user->packets != NULL ? utarray_len(flow_user->packets) : 0);
+}
+
+static void sighandler(int signum)
+{
+ if (signum == SIGUSR1)
+ {
+ nDPIsrvd_flow_info(ndpisrvd_socket, nDPIsrvd_write_flow_info_cb, NULL);
+ }
+ else if (main_thread_shutdown == 0)
+ {
+ main_thread_shutdown = 1;
+ }
+}
+
+static void captured_flow_cleanup_callback(struct nDPIsrvd_socket * const sock,
+ struct nDPIsrvd_instance * const instance,
+ struct nDPIsrvd_thread_data * const thread_data,
+ struct nDPIsrvd_flow * const flow,
+ enum nDPIsrvd_cleanup_reason reason)
+{
+ (void)sock;
+ (void)instance;
+ (void)thread_data;
+ (void)reason;
+
+ struct flow_user_data * const ud = (struct flow_user_data *)flow->flow_user_data;
+ if (ud != NULL && ud->packets != NULL)
+ {
+ utarray_free(ud->packets);
+ ud->packets = NULL;
+ }
+}
+
+static void print_usage(char const * const arg0)
+{
+ static char const usage[] =
+ "Usage: %s "
+ "[-c] [-d] [-p pidfile] [-s host] [-r rotate-every-n-seconds]\n"
+ "\t \t[-u user] [-g group] [-D dir] [-G] [-U] [-R risk] [-M]\n\n"
+ "\t-c\tLog all messages to stdout/stderr instead of syslog.\n"
+ "\t-d\tForking into background after initialization.\n"
+ "\t-p\tWrite the daemon PID to the given file path.\n"
+ "\t-s\tDestination where nDPIsrvd is listening on.\n"
+ "\t \tCan be either a path to UNIX socket or an IPv4/TCP-Port IPv6/TCP-Port tuple.\n"
+ "\t-r\tRotate PCAP files every n seconds\n"
+ "\t-u\tChange user.\n"
+ "\t-g\tChange group.\n"
+ "\t-l\tLogging mode: Log events and some flow metadata to syslog.\n"
+ "\t-L\tCapture mode: Capture and dump packets.\n"
+ "\t-D\tDatadir - Where to store PCAP files.\n"
+ "\t-G\tGuessed - Dump guessed flows to a PCAP file.\n"
+ "\t-U\tUndetected - Dump undetected flows to a PCAP file.\n"
+ "\t-R\tRisky - Dump risky flows to a PCAP file. See additional help below.\n"
+ "\t-M\tMidstream - Dump midstream flows to a PCAP file.\n"
+ "\t-E\tEmpty - Ignore flows w/o any layer 4 payload\n\n"
+ "\tPossible options for `-R' (can be specified multiple times, processed from left to right, ~ disables a "
+ "risk):\n"
+ "\t \tExample: -R0 -R~15 would enable all risks except risk with id 15\n";
+
+ fprintf(stderr, usage, arg0);
+#ifndef LIBNDPI_STATIC
+ fprintf(stderr, "\t\t%d - %s\n", 0, "Capture all risks");
+#else
+ fprintf(stderr, "\t\t%d - %s\n\t\t", 0, "Capture all risks");
+#endif
+ for (int risk = NDPI_NO_RISK + 1; risk < NDPI_MAX_RISK; ++risk)
+ {
+#ifndef LIBNDPI_STATIC
+ fprintf(stderr, "\t\t%d - %s%s", risk, ndpi_risk2str(risk), (risk == NDPI_MAX_RISK - 1 ? "\n\n" : "\n"));
+#else
+ fprintf(stderr, "%d%s", risk, (risk == NDPI_MAX_RISK - 1 ? "\n" : ","));
+#endif
+ }
+}
+
+static int parse_options(int argc, char ** argv)
+{
+ int opt;
+
+ while ((opt = getopt(argc, argv, "hcdp:s:r:u:g:lLD:GUR:ME")) != -1)
+ {
+ switch (opt)
+ {
+ case 'c':
+ enable_console_logger();
+ break;
+ case 'd':
+ daemonize_enable();
+ break;
+ case 'p':
+ free(pidfile);
+ pidfile = strdup(optarg);
+ break;
+ case 's':
+ free(serv_optarg);
+ serv_optarg = strdup(optarg);
+ break;
+ case 'r':
+ if (perror_ull(str_value_to_ull(optarg, &pcap_filename_rotation), "pcap_filename_rotation") !=
+ CONVERSION_OK)
+ {
+ fprintf(stderr, "%s: Argument for `-r' is not a number: %s\n", argv[0], optarg);
+ return 1;
+ }
+ break;
+ case 'u':
+ free(user);
+ user = strdup(optarg);
+ break;
+ case 'g':
+ free(group);
+ group = strdup(optarg);
+ break;
+ case 'l':
+ logging_mode = 1;
+ break;
+ case 'L':
+ capture_mode = 1;
+ break;
+ case 'D':
+ free(datadir);
+ datadir = strdup(optarg);
+ break;
+ case 'G':
+ process_guessed = 1;
+ break;
+ case 'U':
+ process_undetected = 1;
+ break;
+ case 'R':
+ {
+ char * value = (optarg[0] == '~' ? optarg + 1 : optarg);
+ nDPIsrvd_ull risk;
+ if (perror_ull(str_value_to_ull(value, &risk), "process_risky") != CONVERSION_OK)
+ {
+ fprintf(stderr, "%s: Argument for `-R' is not a number: %s\n", argv[0], optarg);
+ return 1;
+ }
+ if (risk >= NDPI_MAX_RISK)
+ {
+ fprintf(stderr, "%s: Invalid risk set: %s\n", argv[0], optarg);
+ return 1;
+ }
+ if (optarg[0] == '~')
+ {
+ unset_ndpi_risk(&process_risky, risk);
+ }
+ else
+ {
+ set_ndpi_risk(&process_risky, risk);
+ }
+ break;
+ }
+ case 'M':
+ process_midstream = 1;
+ break;
+ case 'E':
+ ignore_empty_flows = 1;
+ break;
+ default:
+ print_usage(argv[0]);
+ return 1;
+ }
+ }
+
+ if (logging_mode == 0 && capture_mode == 0)
+ {
+ fprintf(stderr, "%s: Neither `-l' nor `-L' given. See application usage for more information.\n", argv[0]);
+ return 1;
+ }
+
+ if (serv_optarg == NULL)
+ {
+ serv_optarg = strdup(DISTRIBUTOR_UNIX_SOCKET);
+ }
+
+ if (nDPIsrvd_setup_address(&ndpisrvd_socket->address, serv_optarg) != 0)
+ {
+ fprintf(stderr, "%s: Could not parse address `%s'\n", argv[0], serv_optarg);
+ return 1;
+ }
+
+ if (datadir == NULL)
+ {
+ datadir = strdup(DEFAULT_DATADIR);
+ }
+
+ if (process_guessed == 0 && process_undetected == 0 && process_risky == 0 && process_midstream == 0)
+ {
+ fprintf(stderr, "%s: Nothing to capture. Use at least one of -G / -U / -R / -M flags.\n", argv[0]);
+ return 1;
+ }
+
+ if (optind < argc)
+ {
+ fprintf(stderr, "Unexpected argument after options\n\n");
+ print_usage(argv[0]);
+ return 1;
+ }
+
+ if (capture_mode != 0)
+ {
+ errno = 0;
+ if (datadir[0] != '/')
+ {
+ fprintf(stderr,
+ "%s: PCAP capture directory must be absolut i.e. starting with `/', path given: `%s'\n",
+ argv[0],
+ datadir);
+ return 1;
+ }
+ if (mkdir(datadir, S_IRWXU) != 0 && errno != EEXIST)
+ {
+ fprintf(stderr, "%s: Could not create directory %s: %s\n", argv[0], datadir, strerror(errno));
+ return 1;
+ }
+ {
+ struct stat datadir_stat;
+ if (stat(datadir, &datadir_stat) != 0 || S_ISDIR(datadir_stat.st_mode) == 0)
+ {
+ fprintf(stderr, "%s: Data directory %s is not a directory\n", argv[0], datadir);
+ return 1;
+ }
+ }
+ }
+
+ return 0;
+}
+
+static int mainloop(void)
+{
+ enum nDPIsrvd_read_return read_ret = READ_OK;
+
+ while (main_thread_shutdown == 0)
+ {
+ read_ret = nDPIsrvd_read(ndpisrvd_socket);
+ if (errno == EINTR)
+ {
+ continue;
+ }
+ if (read_ret == READ_TIMEOUT)
+ {
+ logger(0,
+ "No data received during the last %llu second(s).\n",
+ (long long unsigned int)ndpisrvd_socket->read_timeout.tv_sec);
+ continue;
+ }
+ if (read_ret != READ_OK)
+ {
+ logger(1, "Could not read from socket: %s", nDPIsrvd_enum_to_string(read_ret));
+ break;
+ }
+
+ enum nDPIsrvd_parse_return parse_ret = nDPIsrvd_parse_all(ndpisrvd_socket);
+ if (parse_ret != PARSE_NEED_MORE_DATA)
+ {
+ logger(1, "Could not parse json message: %s", nDPIsrvd_enum_to_string(parse_ret));
+ break;
+ }
+ }
+
+ if (main_thread_shutdown == 0 && read_ret != READ_OK)
+ {
+ return 1;
+ }
+
+ return 0;
+}
+
+int main(int argc, char ** argv)
+{
+ init_logging("nDPIsrvd-captured");
+
+ ndpisrvd_socket = nDPIsrvd_socket_init(sizeof(struct global_user_data),
+ 0,
+ 0,
+ sizeof(struct flow_user_data),
+ captured_json_callback,
+ NULL,
+ captured_flow_cleanup_callback);
+ if (ndpisrvd_socket == NULL)
+ {
+ fprintf(stderr, "%s: nDPIsrvd socket memory allocation failed!\n", argv[0]);
+ return 1;
+ }
+
+ if (parse_options(argc, argv) != 0)
+ {
+ return 1;
+ }
+
+ logger(0, "Recv buffer size: %u", NETWORK_BUFFER_MAX_SIZE);
+ logger(0, "Connecting to `%s'..", serv_optarg);
+
+ if (nDPIsrvd_connect(ndpisrvd_socket) != CONNECT_OK)
+ {
+ fprintf(stderr, "%s: nDPIsrvd socket connect to %s failed!\n", argv[0], serv_optarg);
+ nDPIsrvd_socket_free(&ndpisrvd_socket);
+ return 1;
+ }
+
+ signal(SIGUSR1, sighandler);
+ signal(SIGINT, sighandler);
+ signal(SIGTERM, sighandler);
+ signal(SIGPIPE, sighandler);
+
+ if (daemonize_with_pidfile(pidfile) != 0)
+ {
+ return 1;
+ }
+
+ if (capture_mode != 0 && chmod_chown(datadir, S_IRWXU | S_IRGRP | S_IXGRP, user, group) != 0)
+ {
+ logger(1, "Could not chmod/chown `%s': %s", datadir, strerror(errno));
+ return 1;
+ }
+
+ errno = 0;
+ if (user != NULL && change_user_group(user, group, pidfile) != 0)
+ {
+ if (errno != 0)
+ {
+ logger(1, "Change user/group failed: %s", strerror(errno));
+ }
+ else
+ {
+ logger(1, "Change user/group failed.");
+ }
+ return 1;
+ }
+
+ if (nDPIsrvd_set_read_timeout(ndpisrvd_socket, 180, 0) != 0)
+ {
+ return 1;
+ }
+
+ int retval = mainloop();
+
+ utarray_packets_free((struct global_user_data *)ndpisrvd_socket->global_user_data);
+ nDPIsrvd_socket_free(&ndpisrvd_socket);
+ daemonize_shutdown(pidfile);
+ shutdown_logging();
+
+ return retval;
+}