56 lines
1.8 KiB
C++
56 lines
1.8 KiB
C++
#include "dhcp.h"
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#include <span>
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#include "pico/rand.h"
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#include "w6300.h"
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namespace dhcp_opt {
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constexpr uint8_t message_type = 53;
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constexpr uint8_t param_request = 55;
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constexpr uint8_t end = 255;
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constexpr uint8_t discover = 1;
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constexpr uint8_t subnet_mask = 1;
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}
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struct __attribute__((packed)) dhcp_discover {
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uint8_t op = 1;
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uint8_t htype = 1;
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uint8_t hlen = 6;
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uint8_t hops = 0;
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uint32_t xid = __builtin_bswap32(static_cast<uint32_t>(get_rand_64()));
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uint16_t secs = 0;
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uint16_t flags = __builtin_bswap16(0x8000);
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std::array<uint8_t, 4> ciaddr = {};
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std::array<uint8_t, 4> yiaddr = {};
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std::array<uint8_t, 4> siaddr = {};
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std::array<uint8_t, 4> giaddr = {};
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std::array<uint8_t, 16> chaddr = {};
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std::array<uint8_t, 64> sname = {};
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std::array<uint8_t, 128> file = {};
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std::array<uint8_t, 4> magic = {99, 130, 83, 99};
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uint8_t opt_msg_type[3] = {dhcp_opt::message_type, 1, dhcp_opt::discover};
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uint8_t opt_params[3] = {dhcp_opt::param_request, 1, dhcp_opt::subnet_mask};
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uint8_t opt_end = dhcp_opt::end;
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};
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static_assert(sizeof(dhcp_discover) == 247);
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static void send_discover(timer_queue& timers, const std::array<uint8_t, 6>& mac) {
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auto sn = w6300::socket_id{0};
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w6300::open_socket(sn, w6300::protocol::udp, w6300::port_num{68}, w6300::sock_flag::none);
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dhcp_discover pkt;
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std::copy(mac.begin(), mac.end(), pkt.chaddr.begin());
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w6300::ip_address broadcast = {};
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broadcast.ip = {255, 255, 255, 255};
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broadcast.len = 4;
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w6300::sendto(sn, std::span{reinterpret_cast<uint8_t*>(&pkt), sizeof(pkt)}, broadcast, w6300::port_num{67});
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timers.schedule_ms(5000, [&timers, mac]() { send_discover(timers, mac); });
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}
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void dhcp_start(timer_queue& timers, const std::array<uint8_t, 6>& mac) {
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send_discover(timers, mac);
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}
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