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#include "sapp_api.h"
#include "sapp_private_api.h"
#ifdef __cplusplus
extern "C" {
#endif
#if 0
#define HASH_RND_LEN_V4 (12 ) /* 2012-08-23 LiJia add, IPv4��������Ԫ����� */
#define HASH_RND_LEN_V6 (36 ) /* 2013-08-16 LiJia add, IPv6��������Ԫ����� */
/* 2013-08-16 LiJia modify,
��V4��V6����Ԫ�鳤�Ȳ�ͬ, �ڼ���perm����ֵʱ,��V6��Ԫ�鳤�ȳ�ʼ����,��V4�����¿��ܻ�ʹ�úϷ���ַ֮������,
���Խ�V4��V6��ַHASHֵ����ֿ�����.
*/
static u_char xor4[HASH_RND_LEN_V4];
static u_char perm4[HASH_RND_LEN_V4];
static u_char xor6[HASH_RND_LEN_V6];
static u_char perm6[HASH_RND_LEN_V6];
static void getrnd(void)
{
struct timeval s;
u_int * ptr;
int i;
int fd = open ("/dev/urandom", O_RDONLY);
if (fd > 0)
{
read (fd, xor4, HASH_RND_LEN_V4);
read (fd, perm4, HASH_RND_LEN_V4);
read (fd, xor6, HASH_RND_LEN_V6);
read (fd, perm6, HASH_RND_LEN_V6);
close (fd);
return;
}
gettimeofday (&s, 0);
srandom (s.tv_usec);
#if 0 /* 2012-08-23 LiJia modify */
ptr = (u_int *) xor;
*ptr = random ();
*(ptr + 1) = random ();
*(ptr + 2) = random ();
ptr = (u_int *) perm;
*ptr = random ();
*(ptr + 1) = random ();
*(ptr + 2) = random ();
#else
for(ptr = (u_int *) xor4, i = 0; i < (int)HASH_RND_LEN_V4/(int)sizeof(int); i++)
{
*(ptr + i) = random();
}
for(ptr = (u_int *) perm4, i = 0; i < (int)HASH_RND_LEN_V4/(int)sizeof(int); i++)
{
*(ptr + i) = random();
}
/* 2013-08-16 LiJia add */
for(ptr = (u_int *) xor4, i = 0; i < (int)HASH_RND_LEN_V6/(int)sizeof(int); i++)
{
*(ptr + i) = random();
}
for(ptr = (u_int *) perm4, i = 0; i < (int)HASH_RND_LEN_V6/(int)sizeof(int); i++)
{
*(ptr + i) = random();
}
#endif
}
/* 2013-08-16 LiJia modify, V4��V6��ַHASHֵ�ֿ����� */
static void init_hash_v4(void)
{
int i, n, j;
int p[HASH_RND_LEN_V4];
for (i = 0; i < HASH_RND_LEN_V4; i++)
p[i] = i;
for (i = 0; i < HASH_RND_LEN_V4; i++)
{
n = perm4[i] % (HASH_RND_LEN_V4 - i);
perm4[i] = p[n];
for (j = 0; j < HASH_RND_LEN_V4 - 1 - n; j++)
p[n + j] = p[n + j + 1];
}
}
/* 2013-08-16 LiJia modify, V4��V6��ַHASHֵ�ֿ����� */
static void init_hash_v6(void)
{
int i, n, j;
int p[HASH_RND_LEN_V6];
for (i = 0; i < HASH_RND_LEN_V6; i++)
p[i] = i;
for (i = 0; i < HASH_RND_LEN_V6; i++)
{
n = perm6[i] % (HASH_RND_LEN_V6 - i);
perm6[i] = p[n];
for (j = 0; j < HASH_RND_LEN_V6 - 1 - n; j++)
p[n + j] = p[n + j + 1];
}
}
#if 0
void fix_rand_v4(void)
{
*((unsigned int*)&xor4[0]) = 1010297553;
*((unsigned int*)&xor4[4]) = 1654752629;
*((unsigned int*)&xor4[8]) = 1527270735;
*((unsigned int*)&perm4[0]) = 1159559006 ;
*((unsigned int*)&perm4[4]) = 4095079788;
*((unsigned int*)&perm4[8]) = 2751541157;
}
#endif
void wy_init_hash(void)
{
#if 1 // 2014-12-17 lijia close for test
getrnd();
#else
fix_rand_v4();
#endif
init_hash_v4();
init_hash_v6();
}
#if 0 /* 2012-08-23 LiJia delete */
u_int mkhash (u_int src, u_short sport, u_int dest, u_short dport)
{
u_int res = 0;
int i;
u_char data[12];
*(u_int *) (data) = src;
*(u_int *) (data + 4) = dest;
*(u_short *) (data + 8) = sport;
*(u_short *) (data + 10) = dport;
for (i = 0; i < 11; i++)
res = ((res << 8) + (data[perm[i]] ^ xor[i])) % 0xff100f;
return res;
}
#endif
#if (0 == USE_LINUX_KERNEL_HASH_ALGO)
//add by lqy 20120503
int mkaddrhash(char *pdata,int datalen)
{
u_int res = 0;
int i;
u_char *p_xor, *p_perm;
//tmp for 12 rand
#if 0 /* 2012-08-23 LiJia modify */
char *data=pdata+8;
for (i = 0; i < datalen-1; i++)
res = ((res << 8) + (data[perm[i]] ^ xor[i])) % 0xff100f;
#else
char *data = pdata;
if(HASH_RND_LEN_V4 == datalen)
{
p_xor = xor4;
p_perm = perm4;
}
else
{
p_xor = xor6;
p_perm = perm6;
}
for (i = 0; i < datalen; i++)
{
res = ((res << 8) + (data[p_perm[i]] ^ p_xor[i])) % 0xff100f;
}
#endif
//printf("\ndata=%p, datalen=%d, hash vale = %u\n",pdata, datalen, res);
return res;
}
#endif
#endif
#ifdef __cplusplus
}
#endif
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