common.h

/*
 * common.h
 *
 *  Created on: Jul 29, 2017
 *      Author: wangyu
 */

#ifndef UDP2RAW_COMMON_H_
#define UDP2RAW_COMMON_H_
#define __STDC_FORMAT_MACROS 1
#include <inttypes.h>

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>

#include <unistd.h>
#include <errno.h>
#include <sys/stat.h>
#include <stdlib.h>  //for exit(0);
#include <errno.h>   //For errno - the error number
#include <fcntl.h>
#include <sys/time.h>
#include <time.h>
#include <stdarg.h>
#include <assert.h>
#include <pthread.h>

#ifndef USE_LIBNET
#define NO_LIBNET
#endif

#if defined(UDP2RAW_MP)
const int is_udp2raw_mp = 1;
#if !defined(__CYGWIN__) && !defined(__MINGW32__)
#include <pcap.h>
#else
#include <pcap_wrapper.h>
#define NO_LIBNET
#endif

#ifndef NO_LIBNET
#include <libnet.h>
#endif

#else
#define UDP2RAW_LINUX
const int is_udp2raw_mp = 0;
//#include <linux/if_ether.h>
#include <linux/filter.h>
#include <linux/if_packet.h>
#include <sys/epoll.h>
//#include <sys/wait.h> //signal
#include <netinet/if_ether.h>
#include <net/if.h>
#include <sys/timerfd.h>

#endif

#if !defined(NO_LIBEV_EMBED)
#include <my_ev.h>
#else
#include "ev.h"
#endif

#if defined(__MINGW32__)
#include <winsock2.h>
#include <ws2ipdef.h>
typedef unsigned char u_int8_t;
typedef unsigned short u_int16_t;
typedef unsigned int u_int32_t;
typedef int socklen_t;
#else
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#endif

#include <unordered_map>
#include <fstream>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <list>
using namespace std;

#if defined(__BYTE_ORDER) && __BYTE_ORDER == __BIG_ENDIAN ||             \
    defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ || \
    defined(__BIG_ENDIAN__) ||                                           \
    defined(__ARMEB__) ||                                                \
    defined(__THUMBEB__) ||                                              \
    defined(__AARCH64EB__) ||                                            \
    defined(_MIBSEB) || defined(__MIBSEB) || defined(__MIBSEB__)
#define UDP2RAW_BIG_ENDIAN 1
#endif

#if defined(__BYTE_ORDER) && __BYTE_ORDER == __LITTLE_ENDIAN ||             \
    defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ || \
    defined(__LITTLE_ENDIAN__) ||                                           \
    defined(__ARMEL__) ||                                                   \
    defined(__THUMBEL__) ||                                                 \
    defined(__AARCH64EL__) ||                                               \
    defined(_MIPSEL) || defined(__MIPSEL) || defined(__MIPSEL__)
#define UDP2RAW_LITTLE_ENDIAN 1
#endif

#if defined(UDP2RAW_BIG_ENDIAN) && defined(UDP2RAW_LITTLE_ENDIAN)
#error "endian detection conflicts"
#endif

#if !defined(UDP2RAW_BIG_ENDIAN) && !defined(UDP2RAW_LITTLE_ENDIAN)
#error "endian detection failed"
#endif

#if defined(__MINGW32__)
int inet_pton(int af, const char *src, void *dst);
const char *inet_ntop(int af, const void *src, char *dst, socklen_t size);
#define setsockopt(a, b, c, d, e) setsockopt(a, b, c, (const char *)(d), e)
#endif

char *get_sock_error();
int get_sock_errno();

#if defined(__MINGW32__)
typedef SOCKET my_fd_t;
inline int sock_close(my_fd_t fd) {
    return closesocket(fd);
}
#else
typedef int my_fd_t;
inline int sock_close(my_fd_t fd) {
    return close(fd);
}

#endif

typedef unsigned long long u64_t;  // this works on most platform,avoid using the PRId64
typedef long long i64_t;

typedef unsigned int u32_t;
typedef int i32_t;

typedef unsigned short u16_t;
typedef short i16_t;

typedef u32_t my_id_t;

typedef u64_t iv_t;

typedef u64_t padding_t;

typedef u64_t anti_replay_seq_t;

typedef u64_t my_time_t;

const int max_addr_len = 100;

extern int force_socket_buf;

extern int g_fix_gro;

/*
struct ip_port_t
{
        u32_t ip;
        int port;
        void from_u64(u64_t u64);
        u64_t to_u64();
        char * to_s();
};*/

typedef u64_t fd64_t;

u32_t djb2(unsigned char *str, int len);
u32_t sdbm(unsigned char *str, int len);

struct address_t  // TODO scope id
{
    struct hash_function {
        u32_t operator()(const address_t &key) const {
            return sdbm((unsigned char *)&key.inner, sizeof(key.inner));
        }
    };

    union storage_t  // sockaddr_storage is too huge, we dont use it.
    {
        sockaddr_in ipv4;
        sockaddr_in6 ipv6;
    };
    storage_t inner;

    address_t() {
        clear();
    }
    void clear() {
        memset(&inner, 0, sizeof(inner));
    }
    int from_ip_port(u32_t ip, int port) {
        clear();
        inner.ipv4.sin_family = AF_INET;
        inner.ipv4.sin_port = htons(port);
        inner.ipv4.sin_addr.s_addr = ip;
        return 0;
    }

    int from_ip_port_new(int type, void *ip, int port) {
        clear();
        if (type == AF_INET) {
            inner.ipv4.sin_family = AF_INET;
            inner.ipv4.sin_port = htons(port);
            inner.ipv4.sin_addr.s_addr = *((u32_t *)ip);
        } else if (type == AF_INET6) {
            inner.ipv6.sin6_family = AF_INET6;
            inner.ipv6.sin6_port = htons(port);
            inner.ipv6.sin6_addr = *((in6_addr *)ip);
        }
        return 0;
    }

    int from_str(char *str);

    int from_str_ip_only(char *str);

    int from_sockaddr(sockaddr *, socklen_t);

    char *get_str();
    void to_str(char *);

    inline u32_t get_type() {
        u32_t ret = ((sockaddr *)&inner)->sa_family;
        assert(ret == AF_INET || ret == AF_INET6);
        return ret;
    }

    inline u32_t get_len() {
        u32_t type = get_type();
        switch (type) {
            case AF_INET:
                return sizeof(sockaddr_in);
            case AF_INET6:
                return sizeof(sockaddr_in6);
            default:
                assert(0 == 1);
        }
        return -1;
    }

    inline u32_t get_port() {
        u32_t type = get_type();
        switch (type) {
            case AF_INET:
                return ntohs(inner.ipv4.sin_port);
            case AF_INET6:
                return ntohs(inner.ipv6.sin6_port);
            default:
                assert(0 == 1);
        }
        return -1;
    }

    inline void set_port(int port) {
        u32_t type = get_type();
        switch (type) {
            case AF_INET:
                inner.ipv4.sin_port = htons(port);
                break;
            case AF_INET6:
                inner.ipv6.sin6_port = htons(port);
                break;
            default:
                assert(0 == 1);
        }
        return;
    }

    bool operator==(const address_t &b) const {
        // return this->data==b.data;
        return memcmp(&this->inner, &b.inner, sizeof(this->inner)) == 0;
    }

    int new_connected_udp_fd();

    char *get_ip();
};

namespace std {
template <>
struct hash<address_t> {
    std::size_t operator()(const address_t &key) const {
        // return address_t::hash_function(k);
        return sdbm((unsigned char *)&key.inner, sizeof(key.inner));
    }
};
}  // namespace std

union my_ip_t  // just a simple version of address_t,stores ip only
{
    u32_t v4;
    in6_addr v6;

    bool equal(const my_ip_t &b) const;

    // int from_str(char * str);
    char *get_str1() const;
    char *get_str2() const;

    int from_address_t(address_t a);
};

struct not_copy_able_t {
    not_copy_able_t() {
    }
    not_copy_able_t(const not_copy_able_t &other) {
        assert(0 == 1);
    }
    const not_copy_able_t &operator=(const not_copy_able_t &other) {
        assert(0 == 1);
        return other;
    }
};

const int huge_data_len = 65535 + 100;  // a packet with link level header might be larger than 65535
const int huge_buf_len = huge_data_len + 100;

const int max_data_len = 1800;
const int buf_len = max_data_len + 400;

// const int max_address_len=512;

#ifdef UDP2RAW_MP
const int queue_len = 200;

struct queue_t {
    char data[queue_len][huge_buf_len];
    int data_len[queue_len];

    int head = 0;
    int tail = 0;
    void clear() {
        head = tail = 0;
    }
    int empty() {
        if (head == tail)
            return 1;
        else
            return 0;
    }
    int full() {
        if ((tail + 1) % queue_len == head)
            return 1;
        else
            return 0;
    }
    void peek_front(char *&p, int &len) {
        assert(!empty());
        p = data[head];
        len = data_len[head];
    }
    void pop_front() {
        assert(!empty());
        head++;
        head %= queue_len;
    }
    void push_back(char *p, int len) {
        assert(!full());
        memcpy(data[tail], p, len);
        data_len[tail] = len;
        tail++;
        tail %= queue_len;
    }
};

int init_ws();
#endif
u64_t get_current_time();
u64_t pack_u64(u32_t a, u32_t b);

u32_t get_u64_h(u64_t a);

u32_t get_u64_l(u64_t a);

char *my_ntoa(u32_t ip);

void init_random_number_fd();
u64_t get_true_random_number_64();
u32_t get_true_random_number();
u32_t get_true_random_number_nz();
u64_t ntoh64(u64_t a);
u64_t hton64(u64_t a);

void write_u16(char *, u16_t a);  // network order
u16_t read_u16(char *);
void write_u32(char *, u32_t a);  // network order
u32_t read_u32(char *);
void write_u64(char *, u64_t a);
u64_t read_u64(char *);

bool larger_than_u16(uint16_t a, uint16_t b);
bool larger_than_u32(u32_t a, u32_t b);
void setnonblocking(int sock);
int set_buf_size(int fd, int socket_buf_size);

void myexit(int a);

unsigned short csum(const unsigned short *ptr, int nbytes);
unsigned short csum_with_header(char *header, int hlen, const unsigned short *ptr, int nbytes);

int numbers_to_char(my_id_t id1, my_id_t id2, my_id_t id3, char *&data, int &len);
int char_to_numbers(const char *data, int len, my_id_t &id1, my_id_t &id2, my_id_t &id3);

const int show_none = 0;
const int show_command = 0x1;
const int show_log = 0x2;
const int show_all = show_command | show_log;

int run_command(string command, char *&output, int flag = show_all);
// int run_command_no_log(string command,char * &output);
int read_file(const char *file, string &output);

vector<string> string_to_vec(const char *s, const char *sp);
vector<vector<string> > string_to_vec2(const char *s);

string trim(const string &str, char c);

string trim_conf_line(const string &str);

vector<string> parse_conf_line(const string &s);

int hex_to_u32_with_endian(const string &a, u32_t &output);
int hex_to_u32(const string &a, u32_t &output);
// extern string iptables_pattern;

int create_fifo(char *file);

void print_binary_chars(const char *a, int len);

template <class key_t>
struct lru_collector_t : not_copy_able_t {
    // typedef void* key_t;
    //#define key_t void*
    struct lru_pair_t {
        key_t key;
        my_time_t ts;
    };

    unordered_map<key_t, typename list<lru_pair_t>::iterator> mp;

    list<lru_pair_t> q;
    int update(key_t key) {
        assert(mp.find(key) != mp.end());
        auto it = mp[key];
        q.erase(it);

        my_time_t value = get_current_time();
        if (!q.empty()) {
            assert(value >= q.front().ts);
        }
        lru_pair_t tmp;
        tmp.key = key;
        tmp.ts = value;
        q.push_front(tmp);
        mp[key] = q.begin();

        return 0;
    }
    int new_key(key_t key) {
        assert(mp.find(key) == mp.end());

        my_time_t value = get_current_time();
        if (!q.empty()) {
            assert(value >= q.front().ts);
        }
        lru_pair_t tmp;
        tmp.key = key;
        tmp.ts = value;
        q.push_front(tmp);
        mp[key] = q.begin();

        return 0;
    }
    int size() {
        return q.size();
    }
    int empty() {
        return q.empty();
    }
    void clear() {
        mp.clear();
        q.clear();
    }
    my_time_t ts_of(key_t key) {
        assert(mp.find(key) != mp.end());
        return mp[key]->ts;
    }

    my_time_t peek_back(key_t &key) {
        assert(!q.empty());
        auto it = q.end();
        it--;
        key = it->key;
        return it->ts;
    }
    void erase(key_t key) {
        assert(mp.find(key) != mp.end());
        q.erase(mp[key]);
        mp.erase(key);
    }
    /*
    void erase_back()
    {
            assert(!q.empty());
            auto it=q.end(); it--;
            key_t key=it->key;
            erase(key);
    }*/
};

#endif /* COMMON_H_ */