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common.cpp
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common.cpp
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/*
* 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 client_or_server=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__)
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;
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()//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);
return (u64_t)(ev_time()*1000);
}
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;
return (u64_t)(ev_time()*1000*1000);
}
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);
}
int add_iptables_rule(char * s)
{
strcpy(iptables_rule,s);
char buf[300]="iptables -I ";
strcat(buf,s);
if(system(buf)==0)
{
mylog(log_warn,"auto added iptables rule by: %s\n",buf);
}
else
{
mylog(log_fatal,"auto added iptables failed by: %s\n",buf);
myexit(-1);
}
return 0;
}
int clear_iptables_rule()
{
if(iptables_rule[0]!=0)
{
char buf[300]="iptables -D ";
strcat(buf,iptables_rule);
if(system(buf)==0)
{
mylog(log_warn,"iptables rule cleared by: %s \n",buf);
}
else
{
mylog(log_error,"clear iptables failed by: %s\n",buf);
}
}
return 0;
}
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,int force_socket_buf)
{
if(0)
{
/*
if(setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &socket_buf_size, sizeof(socket_buf_size))<0)
{
mylog(log_fatal,"SO_SNDBUFFORCE fail socket_buf_size=%d errno=%s\n",socket_buf_size,strerror(errno));
myexit(1);
}
if(setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &socket_buf_size, sizeof(socket_buf_size))<0)
{
mylog(log_fatal,"SO_RCVBUFFORCE fail socket_buf_size=%d errno=%s\n",socket_buf_size,strerror(errno));
myexit(1);
}
*/
}
else
{
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;
}
*/
bool larger_than_u32(u32_t a,u32_t b)
{
u32_t smaller,bigger;
smaller=min(a,b);//smaller in normal sense
bigger=max(a,b);
u32_t distance=min(bigger-smaller,smaller+(0xffffffff-bigger+1));
if(distance==bigger-smaller)
{
if(bigger==a)
{
return 1;
}
else
{
return 0;
}
}
else
{
if(smaller==b)
{
return 0;
}
else
{
return 1;
}
}
}
bool larger_than_u16(uint16_t a,uint16_t b)
{
uint16_t smaller,bigger;
smaller=min(a,b);//smaller in normal sense
bigger=max(a,b);
uint16_t distance=min(bigger-smaller,smaller+(0xffff-bigger+1));
if(distance==bigger-smaller)
{
if(bigger==a)
{
return 1;
}
else
{
return 0;
}
}
else
{
if(smaller==b)
{
return 0;
}
else
{
return 1;
}
}
}
/*
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;
}*/
void ip_port_t::from_u64(u64_t u64)
{
ip=get_u64_h(u64);
port=get_u64_l(u64);
}
u64_t ip_port_t::to_u64()
{
return pack_u64(ip,port);
}
char * ip_port_t::to_s()
{
static char res[40];
sprintf(res,"%s:%d",my_ntoa(ip),port);
return res;
}
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;
}