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packet.cpp
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packet.cpp
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/*
* packet.cpp
*
* Created on: Sep 15, 2017
* Author: root
*/
#include "common.h"
#include "log.h"
#include "packet.h"
#include "misc.h"
int iv_min=4;
int iv_max=32;//< 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 disable_obscure=0;
int disable_xor=0;
int random_drop=0;
char key_string[1000]= "";
//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_old(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_fake_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 do_obscure(char * data,int &len)
{
assert(len>=0);
assert(len<buf_len);
int iv_len=random_between(iv_min,iv_max);
get_fake_random_chars(data+len,iv_len);
data[iv_len+len]=(uint8_t)iv_len;
for(int i=0,j=0;i<len;i++,j++)
{
if(j==iv_len)j=0;
data[i]^=data[len+j];
}
len=len+iv_len+1;
return 0;
}
int de_obscure(char * data,int &len)
{
if(len<1) return -1;
int iv_len=int ((uint8_t) data[len-1]);
if(len<1+iv_len) return -1;
len=len-1-iv_len;
for(int i=0,j=0;i<len;i++,j++)
{
if(j==iv_len)j=0;
data[i]^=data[len+j];
}
return 0;
}
int de_obscure_old(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_fd_addr (int fd,address_t addr,char * buf, int len,int flags)
{
return sendto(fd, buf,
len , 0,
(struct sockaddr *) &addr.inner,
addr.get_len());
}
/*
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)
{
return send(fd,buf,len,flags);
}
int my_send(const dest_t &dest,char *data,int len)
{
if(dest.cook)
{
do_cook(data,len);
}
switch(dest.type)
{
case type_fd_addr:
{
return sendto_fd_addr(dest.inner.fd,dest.inner.fd_addr.addr,data,len,0);
break;
}
case type_fd64_addr:
{
if(!fd_manager.exist(dest.inner.fd64)) return -1;
int fd=fd_manager.to_fd(dest.inner.fd64);
return sendto_fd_addr(fd,dest.inner.fd64_addr.addr,data,len,0);
break;
}
case type_fd:
{
return send_fd(dest.inner.fd,data,len,0);
break;
}
case type_write_fd:
{
return write(dest.inner.fd,data,len);
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_ip_port_conv:
{
if(!fd_manager.exist(dest.inner.fd64)) return -1;
int fd=fd_manager.to_fd(dest.inner.fd64);
char *new_data;
int new_len;
put_conv(dest.conv,data,len,new_data,new_len);
return sendto_fd_ip_port(fd,dest.inner.fd64_ip_port.ip_port.ip,dest.inner.fd64_ip_port.ip_port.port,new_data,new_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) {
assert(len>=0);
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)
{
assert(len_in>=0);
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 )
{
assert(len_in>=0);
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_crc32(char * s,int &len)
{
if(disable_checksum)return 0;
assert(len>=0);
//if(len<0) return -1;
u32_t crc32=crc32h((unsigned char *)s,len);
write_u32(s+len,crc32);
len+=sizeof(u32_t);
return 0;
}
int do_cook(char * data,int &len)
{
put_crc32(data,len);
if(!disable_obscure)do_obscure(data,len);
if(!disable_xor)encrypt_0(data,len,key_string);
return 0;
}
int de_cook(char * s,int &len)
{
if(!disable_xor)decrypt_0(s,len,key_string);
if(!disable_obscure)
{
int ret=de_obscure(s,len);
if(ret!=0)
{
mylog(log_debug,"de_obscure fail\n");
return ret;
}
}
int ret=rm_crc32(s,len);
if(ret!=0)
{
mylog(log_debug,"rm_crc32 fail\n");
return ret;
}
return 0;
}
int rm_crc32(char * s,int &len)
{
if(disable_checksum)return 0;
assert(len>=0);
len-=sizeof(u32_t);
if(len<0) return -1;
u32_t crc32_in=read_u32(s+len);
u32_t crc32=crc32h((unsigned char *)s,len);
if(crc32!=crc32_in) return -1;
return 0;
}
/*
int do_obs()
{
}
int de_obs()*/
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;
}