static uint32_t read_random(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
uint32_t s = 0;
while (s < size) {
buffer[s] = krand() % 0xFF;
offset++;
s++;
}
return size;
}
static void rtl_netd(void * data, char * name) {
fs_node_t * tty = data;
{
fprintf(tty, "Sending DNS query...\n");
uint8_t queries[] = {
3,'i','r','c',
8,'f','r','e','e','n','o','d','e',
3,'n','e','t',
0,
0x00, 0x01, /* A */
0x00, 0x01, /* IN */
};
int my_tx = next_tx_buf();
size_t packet_size = write_dns_packet(rtl_tx_buffer[my_tx], sizeof(queries), queries);
outportl(rtl_iobase + RTL_PORT_TXBUF + 4 * my_tx, rtl_tx_phys[my_tx]);
outportl(rtl_iobase + RTL_PORT_TXSTAT + 4 * my_tx, packet_size);
}
sleep_on(rx_wait);
parse_dns_response(tty, last_packet);
{
fprintf(tty, "Sending DNS query...\n");
uint8_t queries[] = {
7,'n','y','a','n','c','a','t',
5,'d','a','k','k','o',
2,'u','s',
0,
0x00, 0x01, /* A */
0x00, 0x01, /* IN */
};
int my_tx = next_tx_buf();
size_t packet_size = write_dns_packet(rtl_tx_buffer[my_tx], sizeof(queries), queries);
outportl(rtl_iobase + RTL_PORT_TXBUF + 4 * my_tx, rtl_tx_phys[my_tx]);
outportl(rtl_iobase + RTL_PORT_TXSTAT + 4 * my_tx, packet_size);
}
sleep_on(rx_wait);
parse_dns_response(tty, last_packet);
seq_no = krand();
{
fprintf(tty, "Sending TCP syn\n");
int my_tx = next_tx_buf();
uint8_t payload[] = { 0 };
size_t packet_size = write_tcp_packet(rtl_tx_buffer[my_tx], payload, 0, (TCP_FLAGS_SYN | DATA_OFFSET_5));
outportl(rtl_iobase + RTL_PORT_TXBUF + 4 * my_tx, rtl_tx_phys[my_tx]);
outportl(rtl_iobase + RTL_PORT_TXSTAT + 4 * my_tx, packet_size);
seq_no += 1;
ack_no = 0;
}
{
struct ethernet_packet * eth = net_receive();
uint16_t eth_type = ntohs(eth->type);
fprintf(tty, "Ethernet II, Src: (%2x:%2x:%2x:%2x:%2x:%2x), Dst: (%2x:%2x:%2x:%2x:%2x:%2x) [type=%4x)\n",
eth->source[0], eth->source[1], eth->source[2],
eth->source[3], eth->source[4], eth->source[5],
eth->destination[0], eth->destination[1], eth->destination[2],
eth->destination[3], eth->destination[4], eth->destination[5],
eth_type);
struct ipv4_packet * ipv4 = (struct ipv4_packet *)eth->payload;
uint32_t src_addr = ntohl(ipv4->source);
uint32_t dst_addr = ntohl(ipv4->destination);
uint16_t length = ntohs(ipv4->length);
char src_ip[16];
char dst_ip[16];
ip_ntoa(src_addr, src_ip);
ip_ntoa(dst_addr, dst_ip);
fprintf(tty, "IP packet [%s → %s] length=%d bytes\n",
src_ip, dst_ip, length);
struct tcp_header * tcp = (struct tcp_header *)ipv4->payload;
if (seq_no != ntohl(tcp->ack_number)) {
fprintf(tty, "[eth] Expected ack number of 0x%x, got 0x%x\n",
seq_no,
ntohl(tcp->ack_number));
fprintf(tty, "[eth] Bailing...\n");
return;
}
ack_no = ntohl(tcp->seq_number) + 1;
free(eth);
}
{
fprintf(tty, "Sending TCP ack\n");
int my_tx = next_tx_buf();
uint8_t payload[] = { 0 };
size_t packet_size = write_tcp_packet(rtl_tx_buffer[my_tx], payload, 0, (TCP_FLAGS_ACK | DATA_OFFSET_5));
outportl(rtl_iobase + RTL_PORT_TXBUF + 4 * my_tx, rtl_tx_phys[my_tx]);
outportl(rtl_iobase + RTL_PORT_TXSTAT + 4 * my_tx, packet_size);
}
fprintf(tty, "[eth] s-next=0x%x, r-next=0x%x\n", seq_no, ack_no);
}