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add xor and obscure

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This commit is contained in:
wangyu- 2017-10-13 11:27:32 -05:00
parent 0b8fcbe803
commit 11730a8cbf
3 changed files with 81 additions and 22 deletions
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9
main.cpp
View File

@ -442,9 +442,10 @@ int client_event_loop()
mylog(log_warn,"huge packet,data len=%d (>%d).strongly suggested to set a smaller mtu at upper level,to get rid of this warn\n ",data_len,mtu_warn);
}
if(rm_crc32(data,data_len)!=0)
if(cook_rm_crc32(data,data_len)!=0)
{
mylog(log_debug,"crc32 check error");
mylog(log_debug,"cook_rm_crc32 check error");
continue;
}
int out_n;char **out_arr;int *out_len;int *out_delay;
@ -601,9 +602,9 @@ int server_event_loop()
}
if(rm_crc32(data,data_len)!=0)
if(cook_rm_crc32(data,data_len)!=0)
{
mylog(log_debug,"crc32 check error");
mylog(log_debug,"cook_rm_crc32 check error");
continue;
}

93
packet.cpp
View File

@ -11,14 +11,18 @@
#include "packet.h"
int iv_min=2;
int iv_max=16;//< 256;
int iv_max=18;//< 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]= "secret key";
@ -36,6 +40,7 @@ void encrypt_0(char * input,int &len,char *key)
input[i]^=key[j];
}
}
void decrypt_0(char * input,int &len,char *key)
{
@ -47,7 +52,7 @@ void decrypt_0(char * input,int &len,char *key)
input[i]^=key[j];
}
}
int do_obscure(const char * input, int in_len,char *output,int &out_len)
int do_obscure_old(const char * input, int in_len,char *output,int &out_len)
{
//memcpy(output,input,in_len);
// out_len=in_len;
@ -77,7 +82,42 @@ int do_obscure(const char * input, int in_len,char *output,int &out_len)
out_len=iv_len+in_len+1;
return 0;
}
int de_obscure(const char * input, int in_len,char *output,int &out_len)
int do_obscure(char * data,int &len)
{
assert(len>=0);
assert(len<buf_len);
int iv_len=random_between(iv_min,iv_max);
get_true_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;
@ -127,27 +167,20 @@ 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)
{
if(dest.cook)put_crc32(data,len);
if(dest.cook)
{
put_crc32(data,len);
if(!disable_obscure)do_obscure(data,len);
if(!disable_xor)encrypt_0(data,len,key_string);
}
switch(dest.type)
{
case type_ip_port:
@ -197,6 +230,7 @@ int my_send(const dest_t &dest,char *data,int len)
* 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,
@ -220,6 +254,7 @@ unsigned int crc32h(unsigned char *message,int len) {
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);
@ -233,6 +268,7 @@ int put_conv0(u32_t conv,const char * input,int len_in,char *&output,int &len_ou
}
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);
@ -255,14 +291,34 @@ int get_conv0(u32_t &conv,const char *input,int len_in,char *&output,int &len_ou
}
int put_crc32(char * s,int &len)
{
if(len<0) return -1;
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 cook_rm_crc32(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;
}
}
return rm_crc32(s,len);
}
int rm_crc32(char * s,int &len)
{
assert(len>=0);
len-=sizeof(u32_t);
if(len<0) return -1;
u32_t crc32_in=read_u32(s+len);
@ -284,6 +340,7 @@ int put_conv(u32_t conv,const char * input,int len_in,char *&output,int &len_out
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 )

1
packet.h
View File

@ -41,4 +41,5 @@ int put_conv(u32_t conv,const char * input,int len_in,char *&output,int &len_out
int get_conv(u32_t &conv,const char *input,int len_in,char *&output,int &len_out );
int put_crc32(char * s,int &len);
int rm_crc32(char * s,int &len);
int cook_rm_crc32(char * s,int &len);
#endif /* PACKET_H_ */