udp2raw/misc.h

/*
 * misc.h
 *
 *  Created on: Sep 23, 2017
 *      Author: root
 */

#ifndef MISC_H_
#define MISC_H_

#include "common.h"
#include "log.h"
#include "network.h"

extern int hb_mode;
extern int hb_len;
extern char hb_buf[buf_len];

extern int mtu_warn;

extern int max_rst_allowed;
extern int max_rst_to_show;

extern int enable_dns_resolve;

extern int ttl_value;

const u32_t max_handshake_conn_num = 10000;
const u32_t max_ready_conn_num = 1000;
const u32_t anti_replay_window_size = 4000;
const int max_conv_num = 10000;

const u32_t client_handshake_timeout = 5000;  // unit ms
const u32_t client_retry_interval = 1000;     // ms

const u32_t server_handshake_timeout = client_handshake_timeout + 5000;  // this should be longer than clients. client retry initially ,server retry passtively

const int conv_clear_ratio = 30;  // conv grabage collecter check 1/30 of all conv one time
const int conn_clear_ratio = 50;
const int conv_clear_min = 1;
const int conn_clear_min = 1;

const u32_t conv_clear_interval = 1000;  // ms
const u32_t conn_clear_interval = 1000;  // ms

const i32_t max_fail_time = 0;  // disable

const u32_t heartbeat_interval = 600;  // ms

const u32_t timer_interval = 400;  // ms. this should be smaller than heartbeat_interval and retry interval;

const uint32_t conv_timeout = 180000;  // ms. 120 second
// const u32_t conv_timeout=30000; //for test

const u32_t client_conn_timeout = 10000;                              // ms.
const u32_t client_conn_uplink_timeout = client_conn_timeout + 2000;  // ms

const uint32_t server_conn_timeout = conv_timeout + 60000;  // ms. this should be 60s+ longer than conv_timeout,so that conv_manager can destruct convs gradually,to avoid latency glicth
// const u32_t server_conn_timeout=conv_timeout+10000;//for test

const u32_t iptables_rule_keep_interval = 20;  // unit: second;

enum server_current_state_t { server_idle = 0,
                              server_handshake1,
                              server_ready };  // server state machine
enum client_current_state_t { client_idle = 0,
                              client_tcp_handshake,
                              client_handshake1,
                              client_handshake2,
                              client_ready,
                              client_tcp_handshake_dummy };  // client state machine

enum raw_mode_t { mode_faketcp = 0,
                  mode_udp,
                  mode_icmp,
                  mode_end };
enum program_mode_t { unset_mode = 0,
                      client_mode,
                      server_mode };

union current_state_t {
    server_current_state_t server_current_state;
    client_current_state_t client_current_state;
};

// extern char remote_address[max_address_len];
// extern char local_ip[100], remote_ip[100],source_ip[100];//local_ip is for -l option,remote_ip for -r option,source for --source-ip
// extern u32_t local_ip_uint32,remote_ip_uint32,source_ip_uint32;//convert from last line.
// extern int local_port , remote_port,source_port;//similiar to local_ip  remote_ip,buf for port.source_port=0 indicates --source-port is not enabled

extern address_t local_addr, remote_addr, source_addr;

extern my_ip_t bind_addr;

extern int bind_addr_used;
extern int force_source_ip;  // if --source-ip is enabled
extern int force_source_port;
extern int source_port;

extern my_id_t const_id;  // an id used for connection recovery,its generated randomly,it never change since its generated

extern int udp_fd;                 // for client only. client use this fd to listen and handle udp connection
extern int bind_fd;                // bind only,never send or recv.  its just a dummy fd for bind,so that other program wont occupy the same port
extern int epollfd;                // fd for epoll
extern int timer_fd;               // the general timer fd for client and server.for server this is not the only timer find,every connection has a timer fd.
extern int fail_time_counter;      // determine if the max_fail_time is reached
extern int epoll_trigger_counter;  // for debug only
extern int debug_flag;             // for debug only

extern int simple_rule;                 // deprecated.
extern int keep_rule;                   // whether to monitor the iptables rule periodly,re-add if losted
extern int auto_add_iptables_rule;      // if -a is set
extern int generate_iptables_rule;      // if -g is set
extern int generate_iptables_rule_add;  // if --gen-add is set
extern int retry_on_error;
const int retry_on_error_interval = 10;

extern int debug_resend;  // debug only

extern char key_string[1000];  // -k option
extern char fifo_file[1000];

extern raw_mode_t raw_mode;
extern u32_t raw_ip_version;

extern program_mode_t program_mode;
extern unordered_map<int, const char *> raw_mode_tostring;

extern int about_to_exit;

extern int socket_buf_size;

extern pthread_t keep_thread;
extern int keep_thread_running;

int process_lower_level_arg();
void print_help();
void iptables_rule();
void pre_process_arg(int argc, char *argv[]);  // mainly for load conf file;
int unit_test();
int set_timer(int epollfd, int &timer_fd);
int set_timer_server(int epollfd, int &timer_fd, fd64_t &fd64);
int handle_lower_level(raw_info_t &raw_info);

int add_iptables_rule(const char *);

int clear_iptables_rule();

int iptables_gen_add(const char *s, u32_t const_id);
int iptables_rule_init(const char *s, u32_t const_id, int keep);
int keep_iptables_rule();

void signal_handler(int sig);

#endif /* MISC_H_ */