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);
}
/* Does DNS lookup for addr and puts resulting tox id in id_bin. */
void *dns3_lookup_thread(void *data)
{
ToxWindow *self = t_data.self;
char inputdomain[MAX_STR_SIZE];
char name[MAX_STR_SIZE];
int namelen = parse_addr(t_data.addr, name, inputdomain);
if (namelen == -1) {
dns_error(self, "Must be a Tox ID or an address in the form username@domain");
killdns_thread(NULL);
}
char DNS_pubkey[DNS3_KEY_SIZE];
char domain[MAX_DOMAIN_SIZE];
int match = get_domain_match(DNS_pubkey, domain, inputdomain);
if (match == -1) {
dns_error(self, "Domain not found.");
killdns_thread(NULL);
}
void *dns_obj = tox_dns3_new((uint8_t *) DNS_pubkey);
if (dns_obj == NULL) {
dns_error(self, "Core failed to create DNS object.");
killdns_thread(NULL);
}
char string[MAX_DNS_REQST_SIZE + 1];
uint32_t request_id;
int str_len = tox_generate_dns3_string(dns_obj, (uint8_t *) string, sizeof(string), &request_id,
(uint8_t *) name, namelen);
if (str_len == -1) {
dns_error(self, "Core failed to generate DNS3 string.");
killdns_thread(dns_obj);
}
string[str_len] = '\0';
u_char answer[PACKETSZ];
char d_string[MAX_DOMAIN_SIZE + MAX_DNS_REQST_SIZE + 10];
/* format string and create dns query */
snprintf(d_string, sizeof(d_string), "_%s._tox.%s", string, domain);
int ans_len = res_query(d_string, C_IN, T_TXT, answer, sizeof(answer));
if (ans_len <= 0) {
dns_error(self, "DNS query failed.");
killdns_thread(dns_obj);
}
char ans_id[MAX_DNS_REQST_SIZE + 1];
/* extract TXT from DNS response */
if (parse_dns_response(self, answer, ans_len, ans_id) == -1)
killdns_thread(dns_obj);
char encrypted_id[MAX_DNS_REQST_SIZE + 1];
int prfx_len = strlen(TOX_DNS3_TXT_PREFIX);
/* extract the encrypted ID from TXT response */
if (strncmp(ans_id, TOX_DNS3_TXT_PREFIX, prfx_len) != 0) {
dns_error(self, "Bad DNS3 TXT response.");
killdns_thread(dns_obj);
}
memcpy(encrypted_id, ans_id + prfx_len, ans_len - prfx_len);
if (tox_decrypt_dns3_TXT(dns_obj, (uint8_t *) t_data.id_bin, (uint8_t *) encrypted_id,
strlen(encrypted_id), request_id) == -1) {
dns_error(self, "Core failed to decrypt DNS response.");
killdns_thread(dns_obj);
}
pthread_mutex_lock(&Winthread.lock);
cmd_add_helper(self, t_data.m, t_data.id_bin, t_data.msg);
pthread_mutex_unlock(&Winthread.lock);
killdns_thread(dns_obj);
return 0;
}
