Get ipv6address prefix content (TO BE FIXED LATER)

1. void get_ipv6addr_prefix_content(char *ipv6addr,char *prefix)
   
2. {
   
3.     struct in6_addr ipv6;
   
4.     char ipv6_str_r[INET6_ADDRSTRLEN]={0};
   
5.     char *p1,*p2;
   
6.     int prefix_num;
   
7.     char ipaddr_tmp[sizeof(struct in6_addr)];//tmp addr
   
8.     int i=0;
   
9. 
   
10.     //find '/' and process prefix num
    
11.     if(NULL == (p1 = strchr(ipv6addr,'/')))
    
12.     {
    
13.         printf("IPv6 Address without Prefix!\n");
    
14.         exit(1);
    
15.     }
    
16.     else
    
17.     {
    
18.         printf("IPv6 Address with Prefix!\n");
    
19.         p2 = p1+1;
    
20.         prefix_num = atoi(p2);
    
21. 
    
22.         char *tmp = ipv6addr;
    
23.         static int k = 0;
    
24.         while(tmp != p1)
    
25.         {
    
26.             ipaddr_tmp[k] = *tmp;
    
27.             tmp++;
    
28.             k++;
    
29.         }
    
30.         ipaddr_tmp[k-1] = '\0';
    
31.     }
    
32.     
    
33.     u_int8_t prefix_data[prefix_num/8];
    
34.     
    
35.     printf("ipv6address:%s\n", ipv6addr);
    
36.     //string to binary
    
37.     if (inet_pton(AF_INET6,ipaddr_tmp,&ipv6) <= 0)
    
38.     {
    
39.         printf("inet_pton failed.");
    
40.         exit(1);
    
41.     }
    
42.     //printf ipv6addr data
    
43.     for(;i<16;i++)
    
44.     {
    
45.         printf("ipv6.s6_addr[%d]:%x\n",i,ipv6.s6_addr[i]);
    
46.     }
    
47.     printf("=======================================");
    
48. 
    
49.     /* process prefix */    
    
50.     if((prefix_num%2) == 0)//prefix num is even num
    
51.     {
    
52.         printf("\nThe prefix data\n");
    
53.         
    
54.         for(i = 0;i < ((prefix_num)/8);i ++)
    
55.         {
    
56.             prefix_data[i] = ipv6.s6_addr[i];
    
57.             printf("%x\n",prefix_data[i]);
    
58.         }    
    
59.         
    
60.         //tail content set to 0x0
    
61.         int j = prefix_num/8;
    
62.         while(j<16)
    
63.         {
    
64.                 prefix_data[j] = 0x0;
    
65.                 j++;
    
66.         }
    
67.     }
    
68.     else //prefix num is odd num
    
69.     {
    
70.         //to be fixed.
    
71.         exit(1);
    
72.     }
    
73.     printf("=======================================\n");
    
74.     
    
75.     //hex to string
    
76.     if ( !inet_ntop(AF_INET6, prefix_data,ipv6_str_r,sizeof(ipv6_str_r)) )
    
77.     {
    
78.         printf("inet_ntop failed.");
    
79.         exit(1);
    
80.     }
    
81.     printf("Get Prefix##_%s\n", ipv6_str_r);
    
82. 
    
83.     strcpy(prefix,ipv6_str_r);
    
84.     
    
85. }