int release_lease( DHCPLEASE *dhcpl, u32b xid, u8b chaddr[16] )
{
int result = -1, i;
DHCPLIST *temp;
u8b nchaddr[16];
for( i = 0; i < 16; i++ )
nchaddr[i] = 0;
if( !dhcpl )
return -1;
for( temp = list; temp; temp=temp->next )
if( !maccmp( temp->chaddr, chaddr ) )
{
/* We found the address */
result = 0;
fprintf( stdout, "Deleting %X::%X::%X::%X::%X::%X \n", temp->chaddr[0], temp->chaddr[1], temp->chaddr[2], temp->chaddr[3], temp->chaddr[4], temp->chaddr[5] );
temp->available = FREE;
temp->xid = 0;
/* maccpy( temp->chaddr, nchaddr ); */
} else {
/* No such address */
result = -1;
}
return result;
}
int find_lease( DHCPLEASE *dhcpl, u32b xid, u8b chaddr[] )
{
int result = -2;
DHCPLIST *temp;
if( !dhcpl )
return -1;
for( temp = list; temp; temp=temp->next )
if( !maccmp( temp->chaddr, chaddr ) )
release_lease( dhcpl, xid, chaddr);
for( temp = list; temp; temp=temp->next )
if( ( !maccmp( temp->chaddr, chaddr )) && ( temp->type == STATIC ))
{
dhcpl->ip = temp->data.ip;
dhcpl->router = temp->data.router;
dhcpl->mask = temp->data.mask;
dhcpl->lease = temp->data.lease;
dhcpl->siaddr = temp->data.siaddr;
fprintf( stdout, "Assigning Static IP! \n");
temp->available = PROCESSING;
temp->xid = xid;
temp->ltime = MAX_PROCESS_TIME;
maccpy( temp->chaddr, chaddr);
result = 0;
return result;
}
else if( ( temp->available & FREE ) && ( temp->type == DYNAMIC ))
{
dhcpl->ip = temp->data.ip;
dhcpl->router = temp->data.router;
dhcpl->mask = temp->data.mask;
dhcpl->lease = temp->data.lease;
dhcpl->siaddr = temp->data.siaddr;
fprintf( stdout, "Assigning Dynamic IP! \n");
temp->available = PROCESSING;
temp->xid = xid;
temp->ltime = MAX_PROCESS_TIME;
maccpy( temp->chaddr, chaddr);
result = 0;
return result;
}
return result;
}
struct wframe * buffertowframe(char * buffer, int size) {
//First remove radiotap.
struct wframe *frame;
frame = (struct wframe *) malloc(sizeof(struct wframe));
memset(frame, 0, sizeof(struct wframe));
int pos = 0;
uint8_t radiotap_version = buffer[pos++];
uint8_t radiotap_pad = buffer[pos++];
uint16_t radiotap_length = buffer[pos];
if (radiotap_version != 0 || radiotap_pad != 0 || radiotap_length > 1000) {
return NULL;
}
pos += radiotap_length - 4 + 2;
//Decode packet type
uint16_t fc = buffer[pos]; //frame control info
pos += 2;
if((fc & 0x04) != 0) frame->type += 0x2;
if((fc & 0x08) != 0) frame->type += 0x1;
if((fc & 0x10) != 0) frame->stype += 0x1;
if((fc & 0x20) != 0) frame->stype += 0x2;
if((fc & 0x40) != 0) frame->stype += 0x4;
if((fc & 0x80) != 0) frame->stype += 0x8;
if(frame->type != IEEE80211_FTYPE_MGMT)
return NULL;
if(frame->stype != IEEE80211_STYPE_PROBE_REQ && frame->stype != IEEE80211_STYPE_PROBE_RESP)
return NULL;
pos += 2;
memcpy(&frame->addr1, buffer+pos, 6);
pos += 6;
memcpy(&frame->addr2, buffer+pos, 6);
pos += 6;
memcpy(&frame->addr3, buffer+pos, 6);
pos += 6 + 2;
if(maccmp(frame->addr1, stamac) || maccmp(frame->addr2, stamac) || maccmp(frame->addr3, stamac))
return frame;
return NULL;
}