common.cpp

/*
 * comm.cpp
 *
 *  Created on: Jul 29, 2017
 *      Author: wangyu
 */

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

#include <random>
#include <cmath>

int about_to_exit = 0;

raw_mode_t raw_mode = mode_faketcp;
unordered_map<int, const char *> raw_mode_tostring = {{mode_faketcp, "faketcp"}, {mode_udp, "udp"}, {mode_icmp, "icmp"}};

// static int random_number_fd=-1;
char iptables_rule[200] = "";
// int is_client = 0, is_server = 0;

program_mode_t program_mode = unset_mode;  // 0 unset; 1client 2server

working_mode_t working_mode = tunnel_mode;

int socket_buf_size = 1024 * 1024;

int init_ws() {
#if defined(__MINGW32__)
    WORD wVersionRequested;
    WSADATA wsaData;
    int err;

    /* Use the MAKEWORD(lowbyte, highbyte) macro declared in Windef.h */
    wVersionRequested = MAKEWORD(2, 2);

    err = WSAStartup(wVersionRequested, &wsaData);
    if (err != 0) {
        /* Tell the user that we could not find a usable */
        /* Winsock DLL.                                  */
        printf("WSAStartup failed with error: %d\n", err);
        exit(-1);
    }

    /* Confirm that the WinSock DLL supports 2.2.*/
    /* Note that if the DLL supports versions greater    */
    /* than 2.2 in addition to 2.2, it will still return */
    /* 2.2 in wVersion since that is the version we      */
    /* requested.                                        */

    if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
        /* Tell the user that we could not find a usable */
        /* WinSock DLL.                                  */
        printf("Could not find a usable version of Winsock.dll\n");
        WSACleanup();
        exit(-1);
    } else {
        printf("The Winsock 2.2 dll was found okay");
    }

    int tmp[] = {0, 100, 200, 300, 500, 800, 1000, 2000, 3000, 4000, -1};
    int succ = 0;
    for (int i = 1; tmp[i] != -1; i++) {
        if (_setmaxstdio(100) == -1)
            break;
        else
            succ = i;
    }
    printf(", _setmaxstdio() was set to %d\n", tmp[succ]);
#endif
    return 0;
}

#if defined(__MINGW32__)
int inet_pton(int af, const char *src, void *dst) {
    struct sockaddr_storage ss;
    int size = sizeof(ss);
    char src_copy[INET6_ADDRSTRLEN + 1];

    ZeroMemory(&ss, sizeof(ss));
    /* stupid non-const API */
    strncpy(src_copy, src, INET6_ADDRSTRLEN + 1);
    src_copy[INET6_ADDRSTRLEN] = 0;

    if (WSAStringToAddress(src_copy, af, NULL, (struct sockaddr *)&ss, &size) == 0) {
        switch (af) {
            case AF_INET:
                *(struct in_addr *)dst = ((struct sockaddr_in *)&ss)->sin_addr;
                return 1;
            case AF_INET6:
                *(struct in6_addr *)dst = ((struct sockaddr_in6 *)&ss)->sin6_addr;
                return 1;
        }
    }
    return 0;
}

const char *inet_ntop(int af, const void *src, char *dst, socklen_t size) {
    struct sockaddr_storage ss;
    unsigned long s = size;

    ZeroMemory(&ss, sizeof(ss));
    ss.ss_family = af;

    switch (af) {
        case AF_INET:
            ((struct sockaddr_in *)&ss)->sin_addr = *(struct in_addr *)src;
            break;
        case AF_INET6:
            ((struct sockaddr_in6 *)&ss)->sin6_addr = *(struct in6_addr *)src;
            break;
        default:
            return NULL;
    }
    /* cannot direclty use &size because of strict aliasing rules */
    return (WSAAddressToString((struct sockaddr *)&ss, sizeof(ss), NULL, dst, &s) == 0) ? dst : NULL;
}
char *get_sock_error() {
    static char buf[1000];
    int e = WSAGetLastError();
    wchar_t *s = NULL;
    FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
                   NULL, e,
                   MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
                   (LPWSTR)&s, 0, NULL);
    sprintf(buf, "%d:%S", e, s);
    int len = strlen(buf);
    if (len > 0 && buf[len - 1] == '\n') buf[len - 1] = 0;
    LocalFree(s);
    return buf;
}
int get_sock_errno() {
    return WSAGetLastError();
}
#else
char *get_sock_error() {
    static char buf[1000];
    sprintf(buf, "%d:%s", errno, strerror(errno));
    return buf;
}
int get_sock_errno() {
    return errno;
}
#endif

struct my_random_t {
    std::random_device rd;
    std::mt19937 gen;
    std::uniform_int_distribution<u64_t> dis64;
    std::uniform_int_distribution<u32_t> dis32;

    std::uniform_int_distribution<unsigned char> dis8;

    my_random_t() {
        std::mt19937 gen_tmp(rd());
        gen = gen_tmp;
        gen.discard(700000);  // magic
    }
    u64_t gen64() {
        return dis64(gen);
    }
    u32_t gen32() {
        return dis32(gen);
    }

    unsigned char gen8() {
        return dis8(gen);
    }
    /*int random_number_fd;
    random_fd_t()
    {
                    random_number_fd=open("/dev/urandom",O_RDONLY);

                    if(random_number_fd==-1)
                    {
                            mylog(log_fatal,"error open /dev/urandom\n");
                            myexit(-1);
                    }
                    setnonblocking(random_number_fd);
    }
    int get_fd()
    {
            return random_number_fd;
    }*/
} my_random;

int address_t::from_str(char *str) {
    clear();

    char ip_addr_str[100];
    u32_t port;
    mylog(log_info, "parsing address: %s\n", str);
    int is_ipv6 = 0;
    if (sscanf(str, "[%[^]]]:%u", ip_addr_str, &port) == 2) {
        mylog(log_info, "its an ipv6 adress\n");
        inner.ipv6.sin6_family = AF_INET6;
        is_ipv6 = 1;
    } else if (sscanf(str, "%[^:]:%u", ip_addr_str, &port) == 2) {
        mylog(log_info, "its an ipv4 adress\n");
        inner.ipv4.sin_family = AF_INET;
    } else {
        mylog(log_error, "failed to parse\n");
        myexit(-1);
    }

    mylog(log_info, "ip_address is {%s}, port is {%u}\n", ip_addr_str, port);

    if (port > 65535) {
        mylog(log_error, "invalid port: %d\n", port);
        myexit(-1);
    }

    int ret = -100;
    if (is_ipv6) {
        ret = inet_pton(AF_INET6, ip_addr_str, &(inner.ipv6.sin6_addr));
        inner.ipv6.sin6_port = htons(port);
        if (ret == 0)  // 0 if address type doesnt match
        {
            mylog(log_error, "ip_addr %s is not an ipv6 address, %d\n", ip_addr_str, ret);
            myexit(-1);
        } else if (ret == 1)  // inet_pton returns 1 on success
        {
            // okay
        } else {
            mylog(log_error, "ip_addr %s is invalid, %d\n", ip_addr_str, ret);
            myexit(-1);
        }
    } else {
        ret = inet_pton(AF_INET, ip_addr_str, &(inner.ipv4.sin_addr));
        inner.ipv4.sin_port = htons(port);

        if (ret == 0) {
            mylog(log_error, "ip_addr %s is not an ipv4 address, %d\n", ip_addr_str, ret);
            myexit(-1);
        } else if (ret == 1) {
            // okay
        } else {
            mylog(log_error, "ip_addr %s is invalid, %d\n", ip_addr_str, ret);
            myexit(-1);
        }
    }

    return 0;
}

int address_t::from_str_ip_only(char *str) {
    clear();

    u32_t type;

    if (strchr(str, ':') == NULL)
        type = AF_INET;
    else
        type = AF_INET6;

    ((sockaddr *)&inner)->sa_family = type;

    int ret;
    if (type == AF_INET) {
        ret = inet_pton(type, str, &inner.ipv4.sin_addr);
    } else {
        ret = inet_pton(type, str, &inner.ipv6.sin6_addr);
    }

    if (ret == 0)  // 0 if address type doesnt match
    {
        mylog(log_error, "confusion in parsing %s, %d\n", str, ret);
        myexit(-1);
    } else if (ret == 1)  // inet_pton returns 1 on success
    {
        // okay
    } else {
        mylog(log_error, "ip_addr %s is invalid, %d\n", str, ret);
        myexit(-1);
    }
    return 0;
}

char *address_t::get_str() {
    static char res[max_addr_len];
    to_str(res);
    return res;
}
void address_t::to_str(char *s) {
    // static char res[max_addr_len];
    char ip_addr[max_addr_len];
    u32_t port;
    const char *ret = 0;
    if (get_type() == AF_INET6) {
        ret = inet_ntop(AF_INET6, &inner.ipv6.sin6_addr, ip_addr, max_addr_len);
        port = inner.ipv6.sin6_port;
    } else if (get_type() == AF_INET) {
        ret = inet_ntop(AF_INET, &inner.ipv4.sin_addr, ip_addr, max_addr_len);
        port = inner.ipv4.sin_port;
    } else {
        assert(0 == 1);
    }

    if (ret == 0)  // NULL on failure
    {
        mylog(log_error, "inet_ntop failed\n");
        myexit(-1);
    }

    port = ntohs(port);

    ip_addr[max_addr_len - 1] = 0;
    if (get_type() == AF_INET6) {
        sprintf(s, "[%s]:%u", ip_addr, (u32_t)port);
    } else {
        sprintf(s, "%s:%u", ip_addr, (u32_t)port);
    }

    // return res;
}

char *address_t::get_ip() {
    char ip_addr[max_addr_len];
    static char s[max_addr_len];
    const char *ret = 0;
    if (get_type() == AF_INET6) {
        ret = inet_ntop(AF_INET6, &inner.ipv6.sin6_addr, ip_addr, max_addr_len);
    } else if (get_type() == AF_INET) {
        ret = inet_ntop(AF_INET, &inner.ipv4.sin_addr, ip_addr, max_addr_len);
    } else {
        assert(0 == 1);
    }

    if (ret == 0)  // NULL on failure
    {
        mylog(log_error, "inet_ntop failed\n");
        myexit(-1);
    }

    ip_addr[max_addr_len - 1] = 0;
    if (get_type() == AF_INET6) {
        sprintf(s, "%s", ip_addr);
    } else {
        sprintf(s, "%s", ip_addr);
    }

    return s;
}

int address_t::from_sockaddr(sockaddr *addr, socklen_t slen) {
    clear();
    // memset(&inner,0,sizeof(inner));
    if (addr->sa_family == AF_INET6) {
        assert(slen == sizeof(sockaddr_in6));
        // inner.ipv6= *( (sockaddr_in6*) addr );
        memcpy(&inner, addr, slen);
    } else if (addr->sa_family == AF_INET) {
        assert(slen == sizeof(sockaddr_in));
        // inner.ipv4= *( (sockaddr_in*) addr );
        memcpy(&inner, addr, slen);
    } else {
        assert(0 == 1);
    }
    return 0;
}

int address_t::new_connected_udp_fd() {
    int new_udp_fd;
    new_udp_fd = socket(get_type(), SOCK_DGRAM, IPPROTO_UDP);
    if (new_udp_fd < 0) {
        mylog(log_warn, "create udp_fd error\n");
        return -1;
    }
    setnonblocking(new_udp_fd);
    set_buf_size(new_udp_fd, socket_buf_size);

    mylog(log_debug, "created new udp_fd %d\n", new_udp_fd);
    int ret = connect(new_udp_fd, (struct sockaddr *)&inner, get_len());
    if (ret != 0) {
        mylog(log_warn, "udp fd connect fail %d %s\n", ret, strerror(errno));
        // sock_close(new_udp_fd);
        close(new_udp_fd);
        return -1;
    }

    return new_udp_fd;
}

void get_fake_random_chars(char *s, int len) {
    char *p = s;
    int left = len;

    while (left >= (int)sizeof(u64_t)) {
        //*((u64_t*)p)=my_random.gen64();  //this may break strict-alias  ,  also p may not point to a multiple of sizeof(u64_t)

        u64_t tmp = my_random.gen64();
        memcpy(p, &tmp, sizeof(u64_t));  // so,use memcpy instead.

        p += sizeof(u64_t);
        left -= sizeof(u64_t);
    }
    if (left) {
        u64_t tmp = my_random.gen64();
        memcpy(p, &tmp, left);
    }
}

int random_between(u32_t a, u32_t b) {
    if (a > b) {
        mylog(log_fatal, "min >max?? %d %d\n", a, b);
        myexit(1);
    }
    if (a == b)
        return a;
    else
        return a + get_fake_random_number() % (b + 1 - a);
}

/*
u64_t get_current_time()//ms
{
        timespec tmp_time;
        clock_gettime(CLOCK_MONOTONIC, &tmp_time);
        return ((u64_t)tmp_time.tv_sec)*1000llu+((u64_t)tmp_time.tv_nsec)/(1000*1000llu);
}

u64_t get_current_time_us()
{
        timespec tmp_time;
        clock_gettime(CLOCK_MONOTONIC, &tmp_time);
        return (uint64_t(tmp_time.tv_sec))*1000llu*1000llu+ (uint64_t(tmp_time.tv_nsec))/1000llu;
}*/

u64_t get_current_time_us() {
    static u64_t value_fix = 0;
    static u64_t largest_value = 0;

    u64_t raw_value = (u64_t)(ev_time() * 1000 * 1000);

    u64_t fixed_value = raw_value + value_fix;

    if (fixed_value < largest_value) {
        value_fix += largest_value - fixed_value;
    } else {
        largest_value = fixed_value;
    }

    // printf("<%lld,%lld,%lld>\n",raw_value,value_fix,raw_value + value_fix);
    return raw_value + value_fix;  // new fixed value
}

u64_t get_current_time() {
    return get_current_time_us() / 1000lu;
}

u64_t pack_u64(u32_t a, u32_t b) {
    u64_t ret = a;
    ret <<= 32u;
    ret += b;
    return ret;
}
u32_t get_u64_h(u64_t a) {
    return a >> 32u;
}
u32_t get_u64_l(u64_t a) {
    return (a << 32u) >> 32u;
}

void write_u16(char *p, u16_t w) {
    *(unsigned char *)(p + 1) = (w & 0xff);
    *(unsigned char *)(p + 0) = (w >> 8);
}
u16_t read_u16(char *p) {
    u16_t res;
    res = *(const unsigned char *)(p + 0);
    res = *(const unsigned char *)(p + 1) + (res << 8);
    return res;
}

void write_u32(char *p, u32_t l) {
    *(unsigned char *)(p + 3) = (unsigned char)((l >> 0) & 0xff);
    *(unsigned char *)(p + 2) = (unsigned char)((l >> 8) & 0xff);
    *(unsigned char *)(p + 1) = (unsigned char)((l >> 16) & 0xff);
    *(unsigned char *)(p + 0) = (unsigned char)((l >> 24) & 0xff);
}
u32_t read_u32(char *p) {
    u32_t res;
    res = *(const unsigned char *)(p + 0);
    res = *(const unsigned char *)(p + 1) + (res << 8);
    res = *(const unsigned char *)(p + 2) + (res << 8);
    res = *(const unsigned char *)(p + 3) + (res << 8);
    return res;
}

void write_u64(char *s, u64_t a) {
    assert(0 == 1);
}
u64_t read_u64(char *s) {
    assert(0 == 1);
    return 0;
}

char *my_ntoa(u32_t ip) {
    in_addr a;
    a.s_addr = ip;
    return inet_ntoa(a);
}

u64_t get_fake_random_number_64() {
    // u64_t ret;
    // int size=read(random_fd.get_fd(),&ret,sizeof(ret));
    // if(size!=sizeof(ret))
    //{
    //	mylog(log_fatal,"get random number failed %d\n",size);

    //	myexit(-1);
    //}

    return my_random.gen64();
}
u32_t get_fake_random_number() {
    // u32_t ret;
    // int size=read(random_fd.get_fd(),&ret,sizeof(ret));
    // if(size!=sizeof(ret))
    //{
    //	mylog(log_fatal,"get random number failed %d\n",size);
    //	myexit(-1);
    // }
    return my_random.gen32();
}
u32_t get_fake_random_number_nz()  // nz for non-zero
{
    u32_t ret = 0;
    while (ret == 0) {
        ret = get_fake_random_number();
    }
    return ret;
}

/*
u64_t ntoh64(u64_t a)
{
        if(__BYTE_ORDER == __LITTLE_ENDIAN)
        {
                return __bswap_64( a);
        }
        else return a;

}
u64_t hton64(u64_t a)
{
        if(__BYTE_ORDER == __LITTLE_ENDIAN)
        {
                return __bswap_64( a);
        }
        else return a;

}*/

void setnonblocking(int sock) {
#if !defined(__MINGW32__)
    int opts;
    opts = fcntl(sock, F_GETFL);

    if (opts < 0) {
        mylog(log_fatal, "fcntl(sock,GETFL)\n");
        // perror("fcntl(sock,GETFL)");
        myexit(1);
    }
    opts = opts | O_NONBLOCK;
    if (fcntl(sock, F_SETFL, opts) < 0) {
        mylog(log_fatal, "fcntl(sock,SETFL,opts)\n");
        // perror("fcntl(sock,SETFL,opts)");
        myexit(1);
    }
#else
    int iResult;
    u_long iMode = 1;
    iResult = ioctlsocket(sock, FIONBIO, &iMode);
    if (iResult != NO_ERROR)
        printf("ioctlsocket failed with error: %d\n", iResult);

#endif
}

/*
    Generic checksum calculation function
*/
unsigned short csum(const unsigned short *ptr, int nbytes) {
    long sum;
    unsigned short oddbyte;
    short answer;

    sum = 0;
    while (nbytes > 1) {
        sum += *ptr++;
        nbytes -= 2;
    }
    if (nbytes == 1) {
        oddbyte = 0;
        *((u_char *)&oddbyte) = *(u_char *)ptr;
        sum += oddbyte;
    }

    sum = (sum >> 16) + (sum & 0xffff);
    sum = sum + (sum >> 16);
    answer = (short)~sum;

    return (answer);
}

unsigned short tcp_csum(const pseudo_header &ph, const unsigned short *ptr, int nbytes) {  // works both for big and little endian

    long sum;
    unsigned short oddbyte;
    short answer;

    sum = 0;
    unsigned short *tmp = (unsigned short *)&ph;
    for (int i = 0; i < 6; i++) {
        sum += *tmp++;
    }

    while (nbytes > 1) {
        sum += *ptr++;
        nbytes -= 2;
    }
    if (nbytes == 1) {
        oddbyte = 0;
        *((u_char *)&oddbyte) = *(u_char *)ptr;
        sum += oddbyte;
    }

    sum = (sum >> 16) + (sum & 0xffff);
    sum = sum + (sum >> 16);
    answer = (short)~sum;

    return (answer);
}

int set_buf_size(int fd, int socket_buf_size) {
    if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &socket_buf_size, sizeof(socket_buf_size)) < 0) {
        mylog(log_fatal, "SO_SNDBUF fail  socket_buf_size=%d  errno=%s\n", socket_buf_size, get_sock_error());
        myexit(1);
    }
    if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &socket_buf_size, sizeof(socket_buf_size)) < 0) {
        mylog(log_fatal, "SO_RCVBUF fail  socket_buf_size=%d  errno=%s\n", socket_buf_size, get_sock_error());
        myexit(1);
    }
    return 0;
}

void myexit(int a) {
    if (enable_log_color)
        printf("%s\n", RESET);
    // clear_iptables_rule();
    exit(a);
}
void signal_handler(int sig) {
    about_to_exit = 1;
    // myexit(0);
}
/*
int numbers_to_char(id_t id1,id_t id2,id_t id3,char * &data,int &len)
{
        static char buf[buf_len];
        data=buf;
        id_t tmp=htonl(id1);
        memcpy(buf,&tmp,sizeof(tmp));

        tmp=htonl(id2);
        memcpy(buf+sizeof(tmp),&tmp,sizeof(tmp));

        tmp=htonl(id3);
        memcpy(buf+sizeof(tmp)*2,&tmp,sizeof(tmp));

        len=sizeof(id_t)*3;
        return 0;
}


int char_to_numbers(const char * data,int len,id_t &id1,id_t &id2,id_t &id3)
{
        if(len<int(sizeof(id_t)*3)) return -1;
        id1=ntohl(  *((id_t*)(data+0)) );
        id2=ntohl(  *((id_t*)(data+sizeof(id_t))) );
        id3=ntohl(  *((id_t*)(data+sizeof(id_t)*2)) );
        return 0;
}
*/

/*
int set_timer_ms(int epollfd,int &timer_fd,u32_t timer_interval)
{
        int ret;
        epoll_event ev;

        itimerspec its;
        memset(&its,0,sizeof(its));

        if((timer_fd=timerfd_create(CLOCK_MONOTONIC,TFD_NONBLOCK)) < 0)
        {
                mylog(log_fatal,"timer_fd create error\n");
                myexit(1);
        }
        its.it_interval.tv_sec=(timer_interval/1000);
        its.it_interval.tv_nsec=(timer_interval%1000)*1000ll*1000ll;
        its.it_value.tv_nsec=1; //imidiately
        timerfd_settime(timer_fd,0,&its,0);


        ev.events = EPOLLIN;
        ev.data.fd = timer_fd;

        ret=epoll_ctl(epollfd, EPOLL_CTL_ADD, timer_fd, &ev);
        if (ret < 0) {
                mylog(log_fatal,"epoll_ctl return %d\n", ret);
                myexit(-1);
        }
        return 0;
}*/
/*
int create_new_udp(int &new_udp_fd,int remote_address_uint32,int remote_port)
{
        struct sockaddr_in remote_addr_in;

        socklen_t slen = sizeof(sockaddr_in);
        memset(&remote_addr_in, 0, sizeof(remote_addr_in));
        remote_addr_in.sin_family = AF_INET;
        remote_addr_in.sin_port = htons(remote_port);
        remote_addr_in.sin_addr.s_addr = remote_address_uint32;

        new_udp_fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
        if (new_udp_fd < 0) {
                mylog(log_warn, "create udp_fd error\n");
                return -1;
        }
        setnonblocking(new_udp_fd);
        set_buf_size(new_udp_fd);

        mylog(log_debug, "created new udp_fd %d\n", new_udp_fd);
        int ret = connect(new_udp_fd, (struct sockaddr *) &remote_addr_in, slen);
        if (ret != 0) {
                mylog(log_warn, "udp fd connect fail %d %s\n",ret,strerror(errno));
                close(new_udp_fd);
                return -1;
        }
        return 0;
}*/

int round_up_div(int a, int b) {
    return (a + b - 1) / b;
}

int create_fifo(char *file) {
#if !defined(__MINGW32__)
    if (mkfifo(file, 0666) != 0) {
        if (errno == EEXIST) {
            mylog(log_warn, "warning fifo file %s exist\n", file);
        } else {
            mylog(log_fatal, "create fifo file %s failed\n", file);
            myexit(-1);
        }
    }
    int fifo_fd = open(file, O_RDWR);
    if (fifo_fd < 0) {
        mylog(log_fatal, "create fifo file %s failed\n", file);
        myexit(-1);
    }
    struct stat st;
    if (fstat(fifo_fd, &st) != 0) {
        mylog(log_fatal, "fstat failed for fifo file %s\n", file);
        myexit(-1);
    }

    if (!S_ISFIFO(st.st_mode)) {
        mylog(log_fatal, "%s is not a fifo\n", file);
        myexit(-1);
    }

    setnonblocking(fifo_fd);
    return fifo_fd;
#else
    assert(0 == 1 && "not supported\n");
    return 0;
#endif
}

/*
int new_listen_socket(int &fd,u32_t ip,int port)
{
        fd =socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

        int yes = 1;
        //setsockopt(udp_fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes));

        struct sockaddr_in local_me={0};

        socklen_t slen = sizeof(sockaddr_in);
        //memset(&local_me, 0, sizeof(local_me));
        local_me.sin_family = AF_INET;
        local_me.sin_port = htons(port);
        local_me.sin_addr.s_addr = ip;

        if (::bind(fd, (struct sockaddr*) &local_me, slen) == -1) {
                mylog(log_fatal,"socket bind error\n");
                //perror("socket bind error");
                myexit(1);
        }
        setnonblocking(fd);
    set_buf_size(fd,socket_buf_size);

    mylog(log_debug,"local_listen_fd=%d\n",fd);

        return 0;
}
int new_connected_socket(int &fd,u32_t ip,int port)
{
        char ip_port[40];
        sprintf(ip_port,"%s:%d",my_ntoa(ip),port);

        struct sockaddr_in remote_addr_in = { 0 };

        socklen_t slen = sizeof(sockaddr_in);
        //memset(&remote_addr_in, 0, sizeof(remote_addr_in));
        remote_addr_in.sin_family = AF_INET;
        remote_addr_in.sin_port = htons(port);
        remote_addr_in.sin_addr.s_addr = ip;

        fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
        if (fd < 0) {
                mylog(log_warn, "[%s]create udp_fd error\n", ip_port);
                return -1;
        }
        setnonblocking(fd);
        set_buf_size(fd, socket_buf_size);

        mylog(log_debug, "[%s]created new udp_fd %d\n", ip_port, fd);
        int ret = connect(fd, (struct sockaddr *) &remote_addr_in, slen);
        if (ret != 0) {
                mylog(log_warn, "[%s]fd connect fail\n",ip_port);
                sock_close(fd);
                return -1;
        }
        return 0;
}
*/
int new_listen_socket2(int &fd, address_t &addr) {
    fd = socket(addr.get_type(), SOCK_DGRAM, IPPROTO_UDP);

    int yes = 1;

    if (::bind(fd, (struct sockaddr *)&addr.inner, addr.get_len()) == -1) {
        mylog(log_fatal, "socket bind error=%s\n", get_sock_error());
        // perror("socket bind error");
        myexit(1);
    }
    setnonblocking(fd);
    set_buf_size(fd, socket_buf_size);

    mylog(log_debug, "local_listen_fd=%d\n", fd);

    return 0;
}
int new_connected_socket2(int &fd, address_t &addr, address_t *bind_addr, char *interface_string) {
    fd = socket(addr.get_type(), SOCK_DGRAM, IPPROTO_UDP);
    if (fd < 0) {
        mylog(log_warn, "[%s]create udp_fd error\n", addr.get_str());
        return -1;
    }

    if (bind_addr && ::bind(fd, (struct sockaddr *)&bind_addr->inner, bind_addr->get_len()) == -1) {
        mylog(log_fatal, "socket bind error=%s\n", get_sock_error());
        // perror("socket bind error");
        myexit(1);
    }

#ifdef __linux__
    if (interface_string && ::setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, interface_string, strlen(interface_string)) < 0) {
        mylog(log_fatal, "socket interface bind error=%s\n", get_sock_error());
        // perror("socket bind error");
        myexit(1);
    }
#endif

    setnonblocking(fd);
    set_buf_size(fd, socket_buf_size);

    mylog(log_debug, "[%s]created new udp_fd %d\n", addr.get_str(), fd);
    int ret = connect(fd, (struct sockaddr *)&addr.inner, addr.get_len());
    if (ret != 0) {
        mylog(log_warn, "[%s]fd connect fail\n", addr.get_str());
        sock_close(fd);
        return -1;
    }
    return 0;
}

u32_t djb2(unsigned char *str, int len) {
    u32_t hash = 5381;
    int c;
    for (int i=0; i<len ;i++) {
        c = *(str++);
        hash = ((hash << 5) + hash) ^ c; /* (hash * 33) ^ c */
    }

    hash = htonl(hash);
    return hash;
}

u32_t sdbm(unsigned char *str, int len) {
    u32_t hash = 0;
    int c;
    for (int i=0; i<len ;i++) {
        c = *(str++);
        hash = c + (hash << 6) + (hash << 16) - hash;
    }
    // hash=htonl(hash);
    return hash;
}


vector<string> string_to_vec(const char *s, const char *sp) {
    vector<string> res;
    string str = s;
    char *p = strtok((char *)str.c_str(), sp);
    while (p != NULL) {
        res.push_back(p);
        // printf ("%s\n",p);
        p = strtok(NULL, sp);
    }

    /* for(int i=0;i<(int)res.size();i++)
     {
             printf("<<%s>>\n",res[i].c_str());
     }*/
    return res;
}