Hi all,
I am using ioLibrary_Driver-master for DHCP, I am not getting any response from the DHCP.
/* PARSE REPLY pDHCPMSG */
int8_t parseDHCPMSG(void)
{
uint8_t svr_addr[6];
uint16_t svr_port;
uint16_t len;
uint8_t * p;
uint8_t * e;
uint8_t type = 0;
uint8_t opt_len;
if((len = getSn_RX_RSR(DHCP_SOCKET)) > 0)
{
len = recvfrom(DHCP_SOCKET, (uint8_t *)pDHCPMSG, len, svr_addr, &svr_port);
#ifdef DHCP_DEBUG
printf(“DHCP message : %d.%d.%d.%d(%d) %d received. \r\n”,svr_addr[0],svr_addr[1],svr_addr[2], svr_addr[3],svr_port, len);
#endif
}
else
return 0;
if (svr_port == DHCP_SERVER_PORT)
{
// compare mac address
if ( (pDHCPMSG->chaddr[0] != DHCP_CHADDR[0]) || (pDHCPMSG->chaddr[1] != DHCP_CHADDR[1]) ||
(pDHCPMSG->chaddr[2] != DHCP_CHADDR[2]) || (pDHCPMSG->chaddr[3] != DHCP_CHADDR[3]) ||
(pDHCPMSG->chaddr[4] != DHCP_CHADDR[4]) || (pDHCPMSG->chaddr[5] != DHCP_CHADDR[5]) )
return 0;
p = (uint8_t *)(&pDHCPMSG->op);
p = p + 240; // 240 = sizeof(RIP_MSG) + MAGIC_COOKIE size in RIP_MSG.opt - sizeof(RIP_MSG.opt)
e = p + (len - 240);
while ( p < e ) {
switch ( *p ) {
case endOption :
p = e; // for break while(p < e)
break;
case padOption :
p++;
break;
case dhcpMessageType :
p++;
p++;
type = *p++;
break;
case subnetMask :
p++;
p++;
DHCP_allocated_sn[0] = *p++;
DHCP_allocated_sn[1] = *p++;
DHCP_allocated_sn[2] = *p++;
DHCP_allocated_sn[3] = *p++;
break;
case routersOnSubnet :
p++;
opt_len = *p++;
DHCP_allocated_gw[0] = *p++;
DHCP_allocated_gw[1] = *p++;
DHCP_allocated_gw[2] = *p++;
DHCP_allocated_gw[3] = *p++;
p = p + (opt_len - 4);
break;
case dns :
p++;
opt_len = *p++;
DHCP_allocated_dns[0] = *p++;
DHCP_allocated_dns[1] = *p++;
DHCP_allocated_dns[2] = *p++;
DHCP_allocated_dns[3] = *p++;
p = p + (opt_len - 4);
break;
case dhcpIPaddrLeaseTime :
p++;
opt_len = *p++;
dhcp_lease_time = *p++;
dhcp_lease_time = (dhcp_lease_time << 8) + *p++;
dhcp_lease_time = (dhcp_lease_time << 8) + *p++;
dhcp_lease_time = (dhcp_lease_time << 8) + *p++;
#ifdef _DHCP_DEBUG_
dhcp_lease_time = 10;
#endif
break;
case dhcpServerIdentifier :
p++;
opt_len = *p++;
DHCP_SIP[0] = *p++;
DHCP_SIP[1] = *p++;
DHCP_SIP[2] = *p++;
DHCP_SIP[3] = *p++;
break;
default :
p++;
opt_len = *p++;
p += opt_len;
break;
} // switch
} // while
} // if
return type;
}
for the above function I am always getting 0 response.
Please help me out, what could be the mistake and any error on DHCP init.
Thanks.
