55 lines
1.8 KiB
C++
55 lines
1.8 KiB
C++
#include "dhcp.h"
|
|
#include <span>
|
|
#include "w6300.h"
|
|
|
|
namespace dhcp_opt {
|
|
constexpr uint8_t message_type = 53;
|
|
constexpr uint8_t param_request = 55;
|
|
constexpr uint8_t end = 255;
|
|
constexpr uint8_t discover = 1;
|
|
constexpr uint8_t subnet_mask = 1;
|
|
}
|
|
|
|
struct __attribute__((packed)) dhcp_discover {
|
|
uint8_t op = 1;
|
|
uint8_t htype = 1;
|
|
uint8_t hlen = 6;
|
|
uint8_t hops = 0;
|
|
uint32_t xid = __builtin_bswap32(0x12345678);
|
|
uint16_t secs = 0;
|
|
uint16_t flags = __builtin_bswap16(0x8000);
|
|
std::array<uint8_t, 4> ciaddr = {};
|
|
std::array<uint8_t, 4> yiaddr = {};
|
|
std::array<uint8_t, 4> siaddr = {};
|
|
std::array<uint8_t, 4> giaddr = {};
|
|
std::array<uint8_t, 16> chaddr = {};
|
|
std::array<uint8_t, 64> sname = {};
|
|
std::array<uint8_t, 128> file = {};
|
|
std::array<uint8_t, 4> magic = {99, 130, 83, 99};
|
|
uint8_t opt_msg_type[3] = {dhcp_opt::message_type, 1, dhcp_opt::discover};
|
|
uint8_t opt_params[3] = {dhcp_opt::param_request, 1, dhcp_opt::subnet_mask};
|
|
uint8_t opt_end = dhcp_opt::end;
|
|
};
|
|
|
|
static_assert(sizeof(dhcp_discover) == 247);
|
|
|
|
static void send_discover(timer_queue& timers, const std::array<uint8_t, 6>& mac) {
|
|
auto sn = w6300::socket_id{0};
|
|
w6300::open_socket(sn, w6300::protocol::udp, w6300::port_num{68}, w6300::sock_flag::none);
|
|
|
|
dhcp_discover pkt;
|
|
std::copy(mac.begin(), mac.end(), pkt.chaddr.begin());
|
|
|
|
w6300::ip_address broadcast = {};
|
|
broadcast.ip = {255, 255, 255, 255};
|
|
broadcast.len = 4;
|
|
|
|
w6300::sendto(sn, std::span{reinterpret_cast<uint8_t*>(&pkt), sizeof(pkt)}, broadcast, w6300::port_num{67});
|
|
|
|
timers.schedule_ms(5000, [&timers, mac]() { send_discover(timers, mac); });
|
|
}
|
|
|
|
void dhcp_start(timer_queue& timers, const std::array<uint8_t, 6>& mac) {
|
|
send_discover(timers, mac);
|
|
}
|