#include <gtest/gtest.h>

#include "packet_private.h"
#include "packet_parser.h"
#include "session_private.h"
#include "session_manager.h"
#include "test_packets.h"

struct session_manager_options opts = {
    // max session number
    .max_tcp_session_num = 256,
    .max_udp_session_num = 256,

    // session overload
    .tcp_overload_evict_old_sess = 1, // 1: evict old session, 0: bypass new session
    .udp_overload_evict_old_sess = 1, // 1: evict old session, 0: bypass new session

    // tcp timeout
    .tcp_init_timeout = 1,
    .tcp_handshake_timeout = 2,
    .tcp_data_timeout = 3,
    .tcp_half_closed_timeout = 4,
    .tcp_time_wait_timeout = 5,
    .tcp_discard_timeout = 6,
    .tcp_unverified_rst_timeout = 7,

    // udp timeout
    .udp_data_timeout = 8,
    .udp_discard_timeout = 0,

    // duplicate packet filter
    .duplicated_packet_filter_enable = 1,
    .duplicated_packet_filter_capacity = 1000,
    .duplicated_packet_filter_timeout = 10,
    .duplicated_packet_filter_error_rate = 0.0001,

    // evicted session filter
    .evicted_session_filter_enable = 1,
    .evicted_session_filter_capacity = 1000,
    .evicted_session_filter_timeout = 10,
    .evicted_session_filter_error_rate = 0.0001,

    // TCP Reassembly
    .tcp_reassembly_enable = 1,
    .tcp_reassembly_max_timeout = 60000,
    .tcp_reassembly_max_segments = 16,
};

static uint64_t session_id_generator(uint64_t now_ms __attribute__((unused)))
{
    static uint64_t count = 0;
    return (++count);
}

static void packet_set_ip_id(struct packet *pkt, uint16_t ip_id)
{
    const struct layer_private *ipv4_layer = packet_get_innermost_layer(pkt, LAYER_PROTO_IPV4);
    EXPECT_TRUE(ipv4_layer);
    struct ip *hdr = (struct ip *)ipv4_layer->hdr_ptr;
    hdr->ip_id = htons(ip_id);
}

#if 1
TEST(TCP_DUPKT_FILTER_ENABLE, SYN_DUP)
{
    struct packet pkt;
    struct session *sess = NULL;
    struct session_manager *mgr = NULL;
    struct session_manager_stat *stat = NULL;

    mgr = session_manager_new(&opts, 1);
    EXPECT_TRUE(mgr != NULL);
    session_manager_set_session_id_generator(mgr, session_id_generator);

    // C2S SYN Packet
    printf("\n=> Packet Parse: TCP C2S SYN packet\n");
    memset(&pkt, 0, sizeof(pkt));
    packet_parse(&pkt, (const char *)tcp_pkt1_c2s_syn, sizeof(tcp_pkt1_c2s_syn));
    printf("<= Packet Parse: done\n\n");

    // lookup session
    EXPECT_TRUE(session_manager_lookup_session_by_packet(mgr, &pkt) == NULL);
    // new session
    sess = session_manager_new_session(mgr, &pkt, 1);
    EXPECT_TRUE(sess);
    EXPECT_TRUE(session_has_duplicate_traffic(sess) == 0);
    stat = session_manager_stat(mgr);
    EXPECT_TRUE(stat);
    EXPECT_TRUE(stat->tcp_pkts_bypass_duplicated == 0);

    // C2S SYN dup Packet
    printf("\n=> Packet Parse: TCP C2S SYN dup packet\n");
    memset(&pkt, 0, sizeof(pkt));
    packet_parse(&pkt, (const char *)tcp_pkt1_c2s_syn, sizeof(tcp_pkt1_c2s_syn));
    printf("<= Packet Parse: done\n\n");

    // lookup session
    sess = session_manager_lookup_session_by_packet(mgr, &pkt);
    EXPECT_TRUE(sess);
    // update session
    EXPECT_TRUE(session_manager_update_session(mgr, sess, &pkt, 2) == -1);
    EXPECT_TRUE(session_has_duplicate_traffic(sess) == 1);
    stat = session_manager_stat(mgr);
    EXPECT_TRUE(stat);
    EXPECT_TRUE(stat->tcp_pkts_bypass_duplicated == 1);

    // C2S SYN retransmission Packet
    printf("\n=> Packet Parse: TCP C2S SYN retransmission packet\n");
    char syn_retransmission[1500] = {0};
    memcpy(syn_retransmission, tcp_pkt1_c2s_syn, sizeof(tcp_pkt1_c2s_syn));
    memset(&pkt, 0, sizeof(pkt));
    packet_parse(&pkt, (const char *)syn_retransmission, sizeof(tcp_pkt1_c2s_syn));
    packet_set_ip_id(&pkt, 0x1234);
    printf("<= Packet Parse: done\n\n");

    // lookup session
    sess = session_manager_lookup_session_by_packet(mgr, &pkt);
    EXPECT_TRUE(sess);
    // update session
    EXPECT_TRUE(session_manager_update_session(mgr, sess, &pkt, 3) == 0);
    EXPECT_TRUE(session_has_duplicate_traffic(sess) == 1);
    stat = session_manager_stat(mgr);
    EXPECT_TRUE(stat);
    EXPECT_TRUE(stat->tcp_pkts_bypass_duplicated == 1);

    session_manager_free(mgr);
}
#endif

#if 1
TEST(TCP_DUPKT_FILTER_ENABLE, SYNACK_DUP)
{
    struct packet pkt;
    struct session *sess = NULL;
    struct session_manager *mgr = NULL;
    struct session_manager_stat *stat = NULL;

    mgr = session_manager_new(&opts, 1);
    EXPECT_TRUE(mgr != NULL);
    session_manager_set_session_id_generator(mgr, session_id_generator);

    // S2C SYNACK Packet
    printf("\n=> Packet Parse: TCP S2C SYNACK packet\n");
    memset(&pkt, 0, sizeof(pkt));
    packet_parse(&pkt, (const char *)tcp_pkt2_s2c_syn_ack, sizeof(tcp_pkt2_s2c_syn_ack));
    printf("<= Packet Parse: done\n\n");

    // lookup session
    EXPECT_TRUE(session_manager_lookup_session_by_packet(mgr, &pkt) == NULL);
    // new session
    sess = session_manager_new_session(mgr, &pkt, 1);
    EXPECT_TRUE(sess);
    EXPECT_TRUE(session_has_duplicate_traffic(sess) == 0);
    stat = session_manager_stat(mgr);
    EXPECT_TRUE(stat);
    EXPECT_TRUE(stat->tcp_pkts_bypass_duplicated == 0);

    // S2C SYNACK dup Packet
    printf("\n=> Packet Parse: TCP S2C SYNACK dup packet\n");
    memset(&pkt, 0, sizeof(pkt));
    packet_parse(&pkt, (const char *)tcp_pkt2_s2c_syn_ack, sizeof(tcp_pkt2_s2c_syn_ack));
    printf("<= Packet Parse: done\n\n");

    // lookup session
    sess = session_manager_lookup_session_by_packet(mgr, &pkt);
    EXPECT_TRUE(sess);
    // update session
    EXPECT_TRUE(session_manager_update_session(mgr, sess, &pkt, 2) == -1);
    EXPECT_TRUE(session_has_duplicate_traffic(sess) == 1);
    stat = session_manager_stat(mgr);
    EXPECT_TRUE(stat);
    EXPECT_TRUE(stat->tcp_pkts_bypass_duplicated == 1);

    // S2C SYNACK retransmission Packet
    printf("\n=> Packet Parse: TCP S2C SYNACK retransmission packet\n");
    char synack_retransmission[1500] = {0};
    memcpy(synack_retransmission, tcp_pkt2_s2c_syn_ack, sizeof(tcp_pkt2_s2c_syn_ack));
    memset(&pkt, 0, sizeof(pkt));
    packet_parse(&pkt, (const char *)synack_retransmission, sizeof(tcp_pkt2_s2c_syn_ack));
    packet_set_ip_id(&pkt, 0x1234);
    printf("<= Packet Parse: done\n\n");

    // lookup session
    sess = session_manager_lookup_session_by_packet(mgr, &pkt);
    EXPECT_TRUE(sess);
    // update session
    EXPECT_TRUE(session_manager_update_session(mgr, sess, &pkt, 3) == 0);
    EXPECT_TRUE(session_has_duplicate_traffic(sess) == 1);
    stat = session_manager_stat(mgr);
    EXPECT_TRUE(stat);
    EXPECT_TRUE(stat->tcp_pkts_bypass_duplicated == 1);

    session_manager_free(mgr);
}
#endif

#if 1
TEST(TCP_DUPKT_FILTER_ENABLE, SKIP)
{
    struct packet pkt;
    struct session *sess = NULL;
    struct session_manager *mgr = NULL;
    struct session_manager_stat *stat = NULL;
    char syn_retransmission[1500] = {0};

    mgr = session_manager_new(&opts, 1);
    EXPECT_TRUE(mgr != NULL);
    session_manager_set_session_id_generator(mgr, session_id_generator);

    // C2S SYN Packet
    printf("\n=> Packet Parse: TCP C2S SYN packet\n");
    memset(&pkt, 0, sizeof(pkt));
    packet_parse(&pkt, (const char *)tcp_pkt1_c2s_syn, sizeof(tcp_pkt1_c2s_syn));
    printf("<= Packet Parse: done\n\n");

    // lookup session
    EXPECT_TRUE(session_manager_lookup_session_by_packet(mgr, &pkt) == NULL);
    // new session
    sess = session_manager_new_session(mgr, &pkt, 1);
    EXPECT_TRUE(sess);
    EXPECT_TRUE(session_has_duplicate_traffic(sess) == 0);
    stat = session_manager_stat(mgr);
    EXPECT_TRUE(stat);
    EXPECT_TRUE(stat->tcp_pkts_bypass_duplicated == 0);

    // C2S SYN retransmission Packet
    printf("\n=> Packet Parse: TCP C2S SYN retransmission packet\n");
    memcpy(syn_retransmission, tcp_pkt1_c2s_syn, sizeof(tcp_pkt1_c2s_syn));
    memset(&pkt, 0, sizeof(pkt));
    packet_parse(&pkt, (const char *)syn_retransmission, sizeof(tcp_pkt1_c2s_syn));
    packet_set_ip_id(&pkt, 0x1234);
    printf("<= Packet Parse: done\n\n");

    // lookup session
    sess = session_manager_lookup_session_by_packet(mgr, &pkt);
    EXPECT_TRUE(sess);
    // update session
    EXPECT_TRUE(session_manager_update_session(mgr, sess, &pkt, 2) == 0);
    EXPECT_TRUE(session_has_duplicate_traffic(sess) == 0);
    stat = session_manager_stat(mgr);
    EXPECT_TRUE(stat);
    EXPECT_TRUE(stat->tcp_pkts_bypass_duplicated == 0);

    // C2S SYN retransmission Packet
    printf("\n=> Packet Parse: TCP C2S SYN retransmission packet\n");
    memcpy(syn_retransmission, tcp_pkt1_c2s_syn, sizeof(tcp_pkt1_c2s_syn));
    memset(&pkt, 0, sizeof(pkt));
    packet_parse(&pkt, (const char *)syn_retransmission, sizeof(tcp_pkt1_c2s_syn));
    packet_set_ip_id(&pkt, 0x1235);
    printf("<= Packet Parse: done\n\n");

    // lookup session
    sess = session_manager_lookup_session_by_packet(mgr, &pkt);
    EXPECT_TRUE(sess);
    // update session
    EXPECT_TRUE(session_manager_update_session(mgr, sess, &pkt, 3) == 0);
    EXPECT_TRUE(session_has_duplicate_traffic(sess) == 0);
    stat = session_manager_stat(mgr);
    EXPECT_TRUE(stat);
    EXPECT_TRUE(stat->tcp_pkts_bypass_duplicated == 0);

    // C2S SYN dup Packet
    printf("\n=> Packet Parse: TCP C2S SYN dup packet\n");
    memset(&pkt, 0, sizeof(pkt));
    packet_parse(&pkt, (const char *)tcp_pkt1_c2s_syn, sizeof(tcp_pkt1_c2s_syn));
    printf("<= Packet Parse: done\n\n");

    // lookup session
    sess = session_manager_lookup_session_by_packet(mgr, &pkt);
    EXPECT_TRUE(sess);
    // update session
    EXPECT_TRUE(session_manager_update_session(mgr, sess, &pkt, 3) == 0);
    EXPECT_TRUE(session_has_duplicate_traffic(sess) == 0);
    stat = session_manager_stat(mgr);
    EXPECT_TRUE(stat);
    EXPECT_TRUE(stat->tcp_pkts_bypass_duplicated == 0);

    session_manager_free(mgr);
}
#endif

#if 1
TEST(TCP_DUPKT_FILTER_DISABLE, SYN_DUP)
{
    struct packet pkt;
    struct session *sess = NULL;
    struct session_manager *mgr = NULL;
    struct session_manager_stat *stat = NULL;
    struct session_manager_options _opts;
    memcpy(&_opts, &opts, sizeof(struct session_manager_options));
    _opts.duplicated_packet_filter_enable = 0;

    mgr = session_manager_new(&_opts, 1);
    EXPECT_TRUE(mgr != NULL);
    session_manager_set_session_id_generator(mgr, session_id_generator);

    // C2S SYN Packet
    printf("\n=> Packet Parse: TCP C2S SYN packet\n");
    memset(&pkt, 0, sizeof(pkt));
    packet_parse(&pkt, (const char *)tcp_pkt1_c2s_syn, sizeof(tcp_pkt1_c2s_syn));
    printf("<= Packet Parse: done\n\n");

    // lookup session
    EXPECT_TRUE(session_manager_lookup_session_by_packet(mgr, &pkt) == NULL);
    // new session
    sess = session_manager_new_session(mgr, &pkt, 1);
    EXPECT_TRUE(sess);
    EXPECT_TRUE(session_has_duplicate_traffic(sess) == 0);
    stat = session_manager_stat(mgr);
    EXPECT_TRUE(stat);
    EXPECT_TRUE(stat->tcp_pkts_bypass_duplicated == 0);

    // C2S SYN dup Packet
    printf("\n=> Packet Parse: TCP C2S SYN dup packet\n");
    memset(&pkt, 0, sizeof(pkt));
    packet_parse(&pkt, (const char *)tcp_pkt1_c2s_syn, sizeof(tcp_pkt1_c2s_syn));
    printf("<= Packet Parse: done\n\n");

    // lookup session
    sess = session_manager_lookup_session_by_packet(mgr, &pkt);
    EXPECT_TRUE(sess);
    // update session
    EXPECT_TRUE(session_manager_update_session(mgr, sess, &pkt, 2) == 0);
    EXPECT_TRUE(session_has_duplicate_traffic(sess) == 0);
    stat = session_manager_stat(mgr);
    EXPECT_TRUE(stat);
    EXPECT_TRUE(stat->tcp_pkts_bypass_duplicated == 0);

    session_manager_free(mgr);
}
#endif

#if 1
TEST(TCP_DUPKT_FILTER_DISABLE, SYNACK_DUP)
{
    struct packet pkt;
    struct session *sess = NULL;
    struct session_manager *mgr = NULL;
    struct session_manager_stat *stat = NULL;
    struct session_manager_options _opts;
    memcpy(&_opts, &opts, sizeof(struct session_manager_options));
    _opts.duplicated_packet_filter_enable = 0;

    mgr = session_manager_new(&_opts, 1);
    EXPECT_TRUE(mgr != NULL);
    session_manager_set_session_id_generator(mgr, session_id_generator);

    // S2C SYNACK Packet
    printf("\n=> Packet Parse: TCP S2C SYNACK packet\n");
    memset(&pkt, 0, sizeof(pkt));
    packet_parse(&pkt, (const char *)tcp_pkt2_s2c_syn_ack, sizeof(tcp_pkt2_s2c_syn_ack));
    printf("<= Packet Parse: done\n\n");

    // lookup session
    EXPECT_TRUE(session_manager_lookup_session_by_packet(mgr, &pkt) == NULL);
    // new session
    sess = session_manager_new_session(mgr, &pkt, 1);
    EXPECT_TRUE(sess);
    EXPECT_TRUE(session_has_duplicate_traffic(sess) == 0);
    stat = session_manager_stat(mgr);
    EXPECT_TRUE(stat);
    EXPECT_TRUE(stat->tcp_pkts_bypass_duplicated == 0);

    // S2C SYNACK dup Packet
    printf("\n=> Packet Parse: TCP S2C SYNACK dup packet\n");
    memset(&pkt, 0, sizeof(pkt));
    packet_parse(&pkt, (const char *)tcp_pkt2_s2c_syn_ack, sizeof(tcp_pkt2_s2c_syn_ack));
    printf("<= Packet Parse: done\n\n");

    // lookup session
    sess = session_manager_lookup_session_by_packet(mgr, &pkt);
    EXPECT_TRUE(sess);
    // update session
    EXPECT_TRUE(session_manager_update_session(mgr, sess, &pkt, 2) == 0);
    EXPECT_TRUE(session_has_duplicate_traffic(sess) == 0);
    stat = session_manager_stat(mgr);
    EXPECT_TRUE(stat);
    EXPECT_TRUE(stat->tcp_pkts_bypass_duplicated == 0);

    session_manager_free(mgr);
}
#endif

int main(int argc, char **argv)
{
    ::testing::InitGoogleTest(&argc, argv);
    return RUN_ALL_TESTS();
}