#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
typedef struct _code2 {
char sign;
char type;
short len;
int id;
int code0;
int code1;
}code2;
typedef struct _code3 {
char sign;
char type;
short len;
int id;
int unk0;
int code1;
int unk1;
int code0;
int check;
int unk2;
char mac[6];
char dhcp;
char devtype;
int ipaddr;
int netmask;
char padding[48];
}code3;
int waitdata(int hsocket, int time)
{
fd_set fds;
struct timeval tv;
FD_ZERO(&fds);
FD_SET(hsocket,&fds);
tv.tv_usec = time;
tv.tv_sec = 0;
return select(hsocket+1,&fds,NULL,NULL,&tv);
}
int main (int argc, char* argv[])
{
struct in_addr ip, netmask;
char mac[6];
int hsocket;
struct ifreq ifr;
struct sockaddr_in sin;
struct sockaddr *sa = (struct sockaddr *) &sin;
socklen_t fromlen;
struct sockaddr_in *sin_ptr;
u_char *ptr;
u_long *ptr_long;
int n,workwell = 0;
int check;
char c1[] = {7,1,8,0,1,0,0,0};
struct _code2 c2;
struct _code3 c3;
int sendlen, recvlen;
printf("\nFree Dr.COM for Linux v0.1\n MengXP Works,2009 @ xiyou\n http://www.deadc0de.com/\n\n");
if ((hsocket = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
{
perror( "socket error!");
return 0;
}
strcpy(ifr.ifr_name, "ppp0");
if (ioctl(hsocket, SIOCGIFADDR, &ifr) < 0)
perror("ioctl SIOCGIFNETMASK error");
sin_ptr = (struct sockaddr_in *)&ifr.ifr_addr;
ip = sin_ptr->sin_addr;
if (ioctl(hsocket, SIOCGIFNETMASK, &ifr) < 0)
perror("ioctl SIOCGIFNETMASK error");
sin_ptr = (struct sockaddr_in *)&ifr.ifr_addr;
netmask = sin_ptr->sin_addr;
if (ioctl(hsocket, SIOCGIFHWADDR, &ifr) < 0)
perror("ioctl SIOCGIFHWADDR error");
memcpy(&mac,&ifr.ifr_hwaddr.sa_data[0],6); /* fix me! 00:00:00:00:00:00 for ppp0 */
printf("net interface:\n");
ptr = (u_char *)&mac;
printf( "MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
*ptr, *(ptr + 1), *(ptr + 2), *(ptr + 3), *(ptr + 4), *(ptr + 5) );
printf( "Subnet Mask: %s\n", inet_ntoa(netmask));
printf( "IP: %s\n", inet_ntoa(ip));
sin.sin_addr.s_addr = INADDR_ANY;
sin.sin_port = htons(61440);
sin.sin_family = AF_INET;
if ((bind(hsocket,sa,sizeof(sin))) < 0)
{
printf( "can't bind port 61440!\n");
return 0;
}
sin.sin_addr.s_addr = inet_addr("1.1.1.1");
keepalive:
if(!workwell)
printf("Try to connect Dr.COM Server...\n");
while(1)
{
sendlen = sendto(hsocket,&c1,8,0,sa,sizeof(sin));
if(sendlen < 0)
perror("send1 ");
if(waitdata(hsocket,1000*1000))
{
fromlen = sizeof(sin);
recvlen = recvfrom(hsocket,&c2,sizeof(c2),0,sa,&fromlen);
ip = sin.sin_addr;
break;
}
else
printf("recv2 timed out\n");
}
while(1)
{
memset(&c3,0,96);
c3.sign = 7;
c3.len = 96;
c3.id = 3;
c3.code1 = c2.code1;
c3.unk1 = 0x2000200;
c3.code0 = c2.code0;
c3.check = 0x1312fc7;
c3.unk2 = 0x7e;
memcpy(&c3.mac,&mac,6);
c3.devtype = 0x17;
memcpy(&c3.ipaddr,&ip,4);
memcpy(&c3.netmask,&netmask,4);
ptr_long = (u_long *)&c3;
for(n=0,check=0;n<96/4;n++)
check ^= *(ptr_long + n);
c3.check = check * 0x12C4B7E;
c3.unk2 = 0;
ptr = (u_char *)&c3.mac;
for(n=0;n<64;n++)
*(ptr + n) = (*(ptr + n) >> 8 - (n & 7)) + (*(ptr + n) << (n & 7));
sendlen = sendto(hsocket,&c3,96,0,sa,sizeof(sin));
if(sendlen < 0)
perror("send3 ");
if(waitdata(hsocket,1000*1000))
{
fromlen = sizeof(sin);
recvlen = recvfrom(hsocket,&c2,sizeof(c2),0,sa,&fromlen);
if(!workwell)
{
printf("Keeping connection active...\n");
workwell = 1;
}
break;
}
else
{
printf("recv4 timed out\n");
sleep(1);
goto keepalive;
}
}
sleep(15);
goto keepalive;
return 0;
}
Refactorings
No refactoring yet !
When I must use a client when I surf net in our school,but we, our classmates, don't it bad, so a classmate programmed a client. The code is follows below. But it is similar like to have some bug, can you find it?
Thanks very much if you can find bug and enhance it.