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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 "misc.h"
#include <random>
#include <cmath>
//static int random_number_fd=-1;
int force_socket_buf=0;
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;
}
bool my_ip_t::equal (const my_ip_t &b) const
{
//extern int raw_ip_version;
if(raw_ip_version==AF_INET)
{
return v4==b.v4;
}else if(raw_ip_version==AF_INET6)
{
return memcmp(&v6,&b.v6,sizeof(v6))==0;
}
assert(0==1);
return 0;
}
char * my_ip_t::get_str1() const
{
static char res[max_addr_len];
if(raw_ip_version==AF_INET6)
{
assert(inet_ntop(AF_INET6, &v6, res,max_addr_len)!=0);
}
else
{
assert(raw_ip_version==AF_INET);
assert(inet_ntop(AF_INET, &v4, res,max_addr_len)!=0);
}
return res;
}
char * my_ip_t::get_str2() const
{
static char res[max_addr_len];
if(raw_ip_version==AF_INET6)
{
assert(inet_ntop(AF_INET6, &v6, res,max_addr_len)!=0);
}
else
{
assert(raw_ip_version==AF_INET);
assert(inet_ntop(AF_INET, &v4, res,max_addr_len)!=0);
}
return res;
}
int my_ip_t::from_address_t(address_t tmp_addr)
{
if(tmp_addr.get_type()==raw_ip_version&&raw_ip_version==AF_INET)
{
v4=tmp_addr.inner.ipv4.sin_addr.s_addr;
}
else if(tmp_addr.get_type()==raw_ip_version&&raw_ip_version==AF_INET6)
{
v6=tmp_addr.inner.ipv6.sin6_addr;
}
else
{
assert(0==1);
}
return 0;
}
/*
int my_ip_t::from_str(char * str)
{
u32_t type;
if(strchr(str,':')==NULL)
type=AF_INET;
else
type=AF_INET6;
int ret;
ret=inet_pton(type, str,this);
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;
}*/
#ifdef UDP2RAW_MP
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;
}
#endif
#if defined(__MINGW32__)
int inet_pton(int af, const char *src, void *dst)
{
struct sockaddr_storage ss;
int size = sizeof(ss);
char src_copy[max_addr_len+1];
ZeroMemory(&ss, sizeof(ss));
/* stupid non-const API */
strncpy (src_copy, src, max_addr_len+1);
src_copy[max_addr_len] = 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);
while(len>0 && (buf[len-1]=='\r'||buf[len-1]=='\n' ))
{
len--;
buf[len]=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
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()/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;
}
char * my_ntoa(u32_t ip)
{
in_addr a;
a.s_addr=ip;
return inet_ntoa(a);
}
/*
void init_random_number_fd()
{
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);
}*/
#if !defined(__MINGW32__)
struct random_fd_t
{
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;
}
}random_fd;
#else
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()); //random device is broken on mingw
timespec tmp_time;
clock_gettime(CLOCK_MONOTONIC, &tmp_time);
long long a=((u64_t)tmp_time.tv_sec)*1000000000llu+((u64_t)tmp_time.tv_nsec);
std::mt19937 gen_tmp(a);
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;
#endif
u64_t get_true_random_number_64()
{
#if !defined(__MINGW32__)
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 ret;
#else
return my_random.gen64(); //fake random number
#endif
}
u32_t get_true_random_number()
{
#if !defined(__MINGW32__)
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 ret;
#else
return my_random.gen32(); //fake random number
#endif
}
u32_t get_true_random_number_nz() //nz for non-zero
{
u32_t ret=0;
while(ret==0)
{
ret=get_true_random_number();
}
return ret;
}
inline int is_big_endian()
{
int i=1;
return ! *((char *)&i);
}
u64_t ntoh64(u64_t a)
{
#ifdef UDP2RAW_LITTLE_ENDIAN
u32_t h=get_u64_h(a);
u32_t l=get_u64_l(a);
return pack_u64(ntohl(l),ntohl(h));
//return bswap_64( a);
#else
return a;
#endif
}
u64_t hton64(u64_t a)
{
return ntoh64(a);
}
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;
}
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) {//works both for big and little endian
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 csum_with_header(char* header,int hlen,const unsigned short *ptr,int nbytes) {//works both for big and little endian
long sum;
unsigned short oddbyte;
short answer;
assert(hlen%2==0);
sum=0;
unsigned short * tmp= (unsigned short *)header;
for(int i=0;i<hlen/2;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(force_socket_buf)
{
if(is_udp2raw_mp)
{
mylog(log_fatal,"force_socket_buf not supported in this verion\n");
myexit(-1);
}
//assert(0==1);
#ifdef UDP2RAW_LINUX
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);
}
#endif
}
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;
}
int numbers_to_char(my_id_t id1,my_id_t id2,my_id_t id3,char * &data,int &len)
{
static char buf[buf_len];
data=buf;
my_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(my_id_t)*3;
return 0;
}
int char_to_numbers(const char * data,int len,my_id_t &id1,my_id_t &id2,my_id_t &id3)
{
if(len<int(sizeof(my_id_t)*3)) return -1;
//id1=ntohl( *((id_t*)(data+0)) );
memcpy(&id1,data+0,sizeof(id1));
id1=ntohl(id1);
//id2=ntohl( *((id_t*)(data+sizeof(id_t))) );
memcpy(&id2,data+sizeof(my_id_t),sizeof(id2));
id2=ntohl(id2);
//id3=ntohl( *((id_t*)(data+sizeof(id_t)*2)) );
memcpy(&id3,data+sizeof(my_id_t)*2,sizeof(id3));
id3=ntohl(id3);
return 0;
}
int hex_to_u32(const string & a,u32_t &output)
{
//string b="0x";
//b+=a;
if(sscanf(a.c_str(),"%x",&output)==1)
{
//printf("%s %x\n",a.c_str(),output);
return 0;
}
mylog(log_error,"<%s> doesnt contain a hex\n",a.c_str());
return -1;
}
int hex_to_u32_with_endian(const string & a,u32_t &output)
{
//string b="0x";
//b+=a;
if(sscanf(a.c_str(),"%x",&output)==1)
{
output=htonl(output);
//printf("%s %x\n",a.c_str(),output);
return 0;
}
mylog(log_error,"<%s> doesnt contain a hex\n",a.c_str());
return -1;
}
bool larger_than_u32(u32_t a,u32_t b)
{
return ((i32_t(a-b)) >0);
/*
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)
{
return ((i16_t(a-b)) >0);
/*
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;
}
}*/
}
void myexit(int a)
{
if(enable_log_color)
printf("%s\n",RESET);
#ifdef UDP2RAW_LINUX
if(keep_thread_running)
{
if(pthread_cancel(keep_thread))
{
mylog(log_warn,"pthread_cancel failed\n");
}
else
{
mylog(log_info,"pthread_cancel success\n");
}
}
clear_iptables_rule();
#endif
exit(a);
}
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());