mirror of
https://github.com/wangyu-/UDPspeeder.git
synced 2025-01-18 22:09:35 +08:00
279 lines
6.2 KiB
C++
279 lines
6.2 KiB
C++
/*
|
|
* packet.cpp
|
|
*
|
|
* Created on: Sep 15, 2017
|
|
* Author: root
|
|
*/
|
|
|
|
|
|
#include "common.h"
|
|
#include "log.h"
|
|
#include "packet.h"
|
|
|
|
int iv_min=2;
|
|
int iv_max=16;//< 256;
|
|
u64_t packet_send_count=0;
|
|
u64_t dup_packet_send_count=0;
|
|
u64_t packet_recv_count=0;
|
|
u64_t dup_packet_recv_count=0;
|
|
typedef u64_t anti_replay_seq_t;
|
|
int disable_replay_filter=0;
|
|
|
|
int random_drop=0;
|
|
|
|
char key_string[1000]= "secret key";
|
|
|
|
int local_listen_fd=-1;
|
|
|
|
|
|
void encrypt_0(char * input,int &len,char *key)
|
|
{
|
|
int i,j;
|
|
if(key[0]==0) return;
|
|
for(i=0,j=0;i<len;i++,j++)
|
|
{
|
|
if(key[j]==0)j=0;
|
|
input[i]^=key[j];
|
|
}
|
|
}
|
|
void decrypt_0(char * input,int &len,char *key)
|
|
{
|
|
|
|
int i,j;
|
|
if(key[0]==0) return;
|
|
for(i=0,j=0;i<len;i++,j++)
|
|
{
|
|
if(key[j]==0)j=0;
|
|
input[i]^=key[j];
|
|
}
|
|
}
|
|
int do_obscure(const char * input, int in_len,char *output,int &out_len)
|
|
{
|
|
//memcpy(output,input,in_len);
|
|
// out_len=in_len;
|
|
//return 0;
|
|
|
|
int i, j, k;
|
|
if (in_len > 65535||in_len<0)
|
|
return -1;
|
|
int iv_len=iv_min+rand()%(iv_max-iv_min);
|
|
get_true_random_chars(output,iv_len);
|
|
memcpy(output+iv_len,input,in_len);
|
|
|
|
output[iv_len+in_len]=(uint8_t)iv_len;
|
|
|
|
output[iv_len+in_len]^=output[0];
|
|
output[iv_len+in_len]^=key_string[0];
|
|
|
|
for(i=0,j=0,k=1;i<in_len;i++,j++,k++)
|
|
{
|
|
if(j==iv_len) j=0;
|
|
if(key_string[k]==0)k=0;
|
|
output[iv_len+i]^=output[j];
|
|
output[iv_len+i]^=key_string[k];
|
|
}
|
|
|
|
|
|
out_len=iv_len+in_len+1;
|
|
return 0;
|
|
}
|
|
int de_obscure(const char * input, int in_len,char *output,int &out_len)
|
|
{
|
|
//memcpy(output,input,in_len);
|
|
//out_len=in_len;
|
|
//return 0;
|
|
|
|
int i, j, k;
|
|
if (in_len > 65535||in_len<0)
|
|
{
|
|
mylog(log_debug,"in_len > 65535||in_len<0 , %d",in_len);
|
|
return -1;
|
|
}
|
|
int iv_len= int ((uint8_t)(input[in_len-1]^input[0]^key_string[0]) );
|
|
out_len=in_len-1-iv_len;
|
|
if(out_len<0)
|
|
{
|
|
mylog(log_debug,"%d %d\n",in_len,out_len);
|
|
return -1;
|
|
}
|
|
for(i=0,j=0,k=1;i<in_len;i++,j++,k++)
|
|
{
|
|
if(j==iv_len) j=0;
|
|
if(key_string[k]==0)k=0;
|
|
output[i]=input[iv_len+i]^input[j]^key_string[k];
|
|
|
|
}
|
|
dup_packet_recv_count++;
|
|
return 0;
|
|
}
|
|
|
|
|
|
int sendto_fd_ip_port (int fd,u32_t ip,int port,char * buf, int len,int flags)
|
|
{
|
|
|
|
sockaddr_in tmp_sockaddr;
|
|
|
|
memset(&tmp_sockaddr,0,sizeof(tmp_sockaddr));
|
|
tmp_sockaddr.sin_family = AF_INET;
|
|
tmp_sockaddr.sin_addr.s_addr = ip;
|
|
tmp_sockaddr.sin_port = htons(uint16_t(port));
|
|
|
|
return sendto(fd, buf,
|
|
len , 0,
|
|
(struct sockaddr *) &tmp_sockaddr,
|
|
sizeof(tmp_sockaddr));
|
|
}
|
|
int sendto_ip_port (u32_t ip,int port,char * buf, int len,int flags)
|
|
{
|
|
return sendto_fd_ip_port(local_listen_fd,ip,port,buf,len,flags);
|
|
}
|
|
int send_fd (int fd,char * buf, int len,int flags)
|
|
{
|
|
/*
|
|
if(is_client)
|
|
{
|
|
dup_packet_send_count++;
|
|
}
|
|
if(is_client&&random_drop!=0)
|
|
{
|
|
if(get_true_random_number()%10000<(u32_t)random_drop)
|
|
{
|
|
return 0;
|
|
}
|
|
}*/
|
|
return send(fd,buf,len,flags);
|
|
}
|
|
//enum delay_type_t {none=0,enum_sendto_u64,enum_send_fd,client_to_local,client_to_remote,server_to_local,server_to_remote};
|
|
|
|
int my_send(const dest_t &dest,char *data,int len)
|
|
{
|
|
switch(dest.type)
|
|
{
|
|
case type_ip_port:
|
|
{
|
|
return sendto_ip_port(dest.inner.ip_port.ip,dest.inner.ip_port.port,data,len,0);
|
|
break;
|
|
}
|
|
case type_ip_port_conv:
|
|
{
|
|
char *new_data;
|
|
int new_len;
|
|
put_conv(dest.conv,data,len,new_data,new_len);
|
|
return sendto_ip_port(dest.inner.ip_port.ip,dest.inner.ip_port.port,new_data,new_len,0);
|
|
break;
|
|
}
|
|
case type_fd64:
|
|
{
|
|
if(!fd_manager.exist(dest.inner.fd64)) return -1;
|
|
int fd=fd_manager.to_fd(dest.inner.fd64);
|
|
return send_fd(fd,data,len,0);
|
|
break;
|
|
}
|
|
case type_fd64_conv:
|
|
{
|
|
char *new_data;
|
|
int new_len;
|
|
put_conv(dest.conv,data,len,new_data,new_len);
|
|
|
|
if(!fd_manager.exist(dest.inner.fd64)) return -1;
|
|
int fd=fd_manager.to_fd(dest.inner.fd64);
|
|
return send_fd(fd,new_data,new_len,0);
|
|
}
|
|
/*
|
|
case type_fd:
|
|
{
|
|
send_fd(dest.inner.fd,data,len,0);
|
|
break;
|
|
}*/
|
|
default:
|
|
assert(0==1);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* this function comes from http://www.hackersdelight.org/hdcodetxt/crc.c.txt
|
|
*/
|
|
unsigned int crc32h(unsigned char *message,int len) {
|
|
int i, crc;
|
|
unsigned int byte, c;
|
|
const unsigned int g0 = 0xEDB88320, g1 = g0>>1,
|
|
g2 = g0>>2, g3 = g0>>3, g4 = g0>>4, g5 = g0>>5,
|
|
g6 = (g0>>6)^g0, g7 = ((g0>>6)^g0)>>1;
|
|
|
|
i = 0;
|
|
crc = 0xFFFFFFFF;
|
|
while (i!=len) { // Get next byte.
|
|
byte = message[i];
|
|
crc = crc ^ byte;
|
|
c = ((crc<<31>>31) & g7) ^ ((crc<<30>>31) & g6) ^
|
|
((crc<<29>>31) & g5) ^ ((crc<<28>>31) & g4) ^
|
|
((crc<<27>>31) & g3) ^ ((crc<<26>>31) & g2) ^
|
|
((crc<<25>>31) & g1) ^ ((crc<<24>>31) & g0);
|
|
crc = ((unsigned)crc >> 8) ^ c;
|
|
i = i + 1;
|
|
}
|
|
return ~crc;
|
|
}
|
|
|
|
int put_conv0(u32_t conv,const char * input,int len_in,char *&output,int &len_out)
|
|
{
|
|
static char buf[buf_len];
|
|
output=buf;
|
|
u32_t n_conv=htonl(conv);
|
|
memcpy(output,&n_conv,sizeof(n_conv));
|
|
memcpy(output+sizeof(n_conv),input,len_in);
|
|
u32_t crc32=crc32h((unsigned char *)output,len_in+sizeof(crc32));
|
|
u32_t crc32_n=htonl(crc32);
|
|
len_out=len_in+(int)(sizeof(n_conv))+(int)sizeof(crc32_n);
|
|
memcpy(output+len_in+(int)(sizeof(n_conv)),&crc32_n,sizeof(crc32_n));
|
|
return 0;
|
|
}
|
|
int get_conv0(u32_t &conv,const char *input,int len_in,char *&output,int &len_out )
|
|
{
|
|
u32_t n_conv;
|
|
memcpy(&n_conv,input,sizeof(n_conv));
|
|
conv=ntohl(n_conv);
|
|
output=(char *)input+sizeof(n_conv);
|
|
u32_t crc32_n;
|
|
len_out=len_in-(int)sizeof(n_conv)-(int)sizeof(crc32_n);
|
|
if(len_out<0)
|
|
{
|
|
mylog(log_debug,"len_out<0\n");
|
|
return -1;
|
|
}
|
|
memcpy(&crc32_n,input+len_in-(int)sizeof(crc32_n),sizeof(crc32_n));
|
|
u32_t crc32=ntohl(crc32_n);
|
|
if(crc32!=crc32h((unsigned char *)input,len_in-(int)sizeof(crc32_n)))
|
|
{
|
|
mylog(log_debug,"crc32 check failed\n");
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int put_conv(u32_t conv,const char * input,int len_in,char *&output,int &len_out)
|
|
{
|
|
static char buf[buf_len];
|
|
output=buf;
|
|
u32_t n_conv=htonl(conv);
|
|
memcpy(output,&n_conv,sizeof(n_conv));
|
|
memcpy(output+sizeof(n_conv),input,len_in);
|
|
len_out=len_in+(int)(sizeof(n_conv));
|
|
return 0;
|
|
}
|
|
int get_conv(u32_t &conv,const char *input,int len_in,char *&output,int &len_out )
|
|
{
|
|
u32_t n_conv;
|
|
memcpy(&n_conv,input,sizeof(n_conv));
|
|
conv=ntohl(n_conv);
|
|
output=(char *)input+sizeof(n_conv);
|
|
len_out=len_in-(int)sizeof(n_conv);
|
|
if(len_out<0)
|
|
{
|
|
mylog(log_debug,"len_out<0\n");
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|