int ip_belong_to_network(char *ip,char *network) //check that ip is belong to network

,

//network:*.*.*.*/*;*.*.*.*/*;......MAX SUPPORT 8 networks

{

if(ip==NULL||network==NULL)return 0;

if(strlen(network)>=160)return 0;//

char subnetwork[8][20];

char *whitespace = ";";

char *token;

int i = 0;

for(i=0;i<8;i++)strcpy(subnetwork[i],"");//init it;

i = 0;

unsigned long int_ip = (unsigned long)ntohl(inet_addr(ip)); //ip in int

unsigned long submask=0;

unsigned long int_net=0;

for (token=strtok(network, whitespace); token!=NULL; token=strtok(NULL, whitespace))

		{

			if(strlen(token)<19)//max subcmd length

			{

			strcpy(subnetwork[i],token);

			//printf("num %d str:%s
",i,subnetwork[i]);

			submask = (unsigned long)get_network_submask(subnetwork[i]);

			int_net = (unsigned long)get_network_network(subnetwork[i]);

			//printf("ip:%x,submask:%x,net:%x,and:%x
",int_ip,submask,int_net,int_ip&subma

sk);

			if((int_ip&submask)==int_net)

			{

			//printf("match
");

			return 1;

			}

			i++;

			}



		}

return 0;

}

unsigned long get_network_submask(char *network) //input 1.1.1.0/24 return FF FF FF

00

{

unsigned long submask=0;

if(network==NULL)return 0;

char temp_net[20]="";

strcpy(temp_net,network);

char *p;

p = temp_net;

int net_len = strlen(network);

int i =0;

int sub_num=0;



while(*p!='/'&&(i<net_len)){p++;i++;}

	if(*p=='/')

	{

	p++;

	sub_num = (int)atoi(p); //24

        unsigned long temp =(unsigned long)pow(2,sub_num)-1;

	submask = temp<<(32-sub_num);

        //printf("sub_num:%d,mask:%x
",sub_num,submask);

	return submask;

	}

return 0;



}

unsigned long get_network_network(char *network) //input 1.1.1.0/24 return

int(1.1.1.0)

{

if(network==NULL)return 0;

if(strlen(network)<9)return 0; //1.1.1.1/1 min length

char temp_net[20];

strcpy(temp_net,network);

char *p = temp_net;

int net_len = strlen(network);

int i =0;

while(*p!='/'&&(i<net_len)){p++;i++;}

*p='';

return (unsigned long)ntohl(inet_addr(temp_net));



}