/**@brief this generates a Fins frame which is sent to the arp module so that the
* (1) a host receives an ARP reply, OR (2) sends an ARP request to a network
* @param fins_frame is the pointer to the received fins frame
* @param task indicates whether the arp message is a request or a reply to or from network
*/
void fins_from_net(struct finsFrame *fins_frame, int task)
{
uint32_t IP_addrs_read;
uint64_t MAC_addrs;
struct ARP_message *msg1 = (struct ARP_message*)malloc(sizeof(struct ARP_message));
struct ARP_message *msg2 = (struct ARP_message*)malloc(sizeof(struct ARP_message));
struct arp_hdr *arp_net = (struct arp_hdr*) malloc(sizeof(struct arp_hdr));
PRINT_DEBUG("\nFins data frame which carries a request or reply ARP from a network\n");
IP_addrs_read = read_IP_addrs();
MAC_addrs = search_MAC_addrs(IP_addrs_read, ptr_neighbor_list);
if (task==1){
mimic_net_request(IP_addrs_read, MAC_addrs, msg1);
arp_msg_to_hdr(msg1, arp_net);
host_to_net(arp_net);
arp_to_fins(arp_net, fins_frame);
}
else if (task==2){
gen_requestARP(IP_addrs_read, msg1);
mimic_net_reply(msg1, msg2);
arp_msg_to_hdr(msg2, arp_net);
host_to_net(arp_net);
arp_to_fins(arp_net, fins_frame);
}
fins_frame->destinationID.id = ARPID;
free(msg1);
free(msg2);
}
/*************************************************************************
* change packet's format from SOS message to MAC *
*************************************************************************/
void sosmsg_to_mac(Message *msg, VMAC_PPDU *ppdu)
{
ppdu->len = msg->len + PRE_PAYLOAD_LEN + POST_PAYLOAD_LEN;
ppdu->mpdu.daddr = host_to_net(msg->daddr);
ppdu->mpdu.saddr = host_to_net(msg->saddr);
ppdu->mpdu.did = msg->did;
ppdu->mpdu.sid = msg->sid;
ppdu->mpdu.type = msg->type;
ppdu->mpdu.data = msg->data;
}
/* Send the packets to tell our friends what our DHT public key is.
*
* if onion_dht_both is 0, use only the onion to send the packet.
* if it is 1, use only the dht.
* if it is something else, use both.
*
* return the number of packets sent on success
* return -1 on failure.
*/
static int send_fakeid_announce(Onion_Client *onion_c, uint16_t friend_num, uint8_t onion_dht_both)
{
if (friend_num >= onion_c->num_friends)
return -1;
uint8_t data[FAKEID_DATA_MAX_LENGTH];
data[0] = FAKEID_DATA_ID;
uint64_t no_replay = unix_time();
host_to_net((uint8_t *)&no_replay, sizeof(no_replay));
memcpy(data + 1, &no_replay, sizeof(no_replay));
memcpy(data + 1 + sizeof(uint64_t), onion_c->dht->self_public_key, crypto_box_PUBLICKEYBYTES);
Node_format nodes[MAX_SENT_NODES];
uint16_t num_nodes = closelist_nodes(onion_c->dht, nodes, MAX_SENT_NODES);
uint32_t i;
for (i = 0; i < num_nodes; ++i)
to_net_family(&nodes[i].ip_port.ip);
memcpy(data + FAKEID_DATA_MIN_LENGTH, nodes, sizeof(Node_format) * num_nodes);
int num1 = -1, num2 = -1;
if (onion_dht_both != 1)
num1 = send_onion_data(onion_c, friend_num, data, FAKEID_DATA_MIN_LENGTH + sizeof(Node_format) * num_nodes);
if (onion_dht_both != 0)
num2 = send_dht_fakeid(onion_c, friend_num, data, FAKEID_DATA_MIN_LENGTH + sizeof(Node_format) * num_nodes);
if (num1 == -1)
return num2;
if (num2 == -1)
return num1;
return num1 + num2;
}
/**@brief This function sends out a fins frame that passes an arp request out to the network
* @param sought_IP_addrs is the IP address whose associated MAC address is sought
* @param fins_arp_out points to the fins frame which will be sent from the module
* */
void arp_out_request(uint32_t sought_IP_addrs, struct finsFrame *fins_arp_out){
gen_requestARP(sought_IP_addrs, &arp_msg);
arp_msg_to_hdr(&arp_msg, packet);
host_to_net(packet);
print_arp_hdr(packet);
arp_to_fins(packet, fins_arp_out); /**arp request to be sent to network*/
}
/**@brief This function sends out a fins frame with a reply arp in response to a request
* from the network
* @param fins_arp_out points to the fins frame which will be sent from the module
* */
void arp_out_reply(struct finsFrame *fins_arp_out){
struct ARP_message arp_msg_reply;
gen_replyARP(&arp_msg, &arp_msg_reply);
arp_msg_to_hdr(&arp_msg_reply, packet);
host_to_net(packet);
print_arp_hdr(packet);
arp_to_fins(packet, fins_arp_out); /**arp reply to be sent to network */
}
static int save_blocklist(char *path)
{
if (arg_opts.ignore_data_file)
return 0;
if (path == NULL)
return -1;
int len = sizeof(BlockedFriend) * Blocked_Contacts.num_blocked;
char *data = malloc(len);
if (data == NULL)
exit_toxic_err("Failed in save_blocklist", FATALERR_MEMORY);
int i;
int count = 0;
for (i = 0; i < Blocked_Contacts.max_index; ++i) {
if (count > Blocked_Contacts.num_blocked)
return -1;
if (Blocked_Contacts.list[i].active) {
BlockedFriend tmp;
memset(&tmp, 0, sizeof(BlockedFriend));
tmp.namelength = htons(Blocked_Contacts.list[i].namelength);
memcpy(tmp.name, Blocked_Contacts.list[i].name, Blocked_Contacts.list[i].namelength + 1);
memcpy(tmp.pub_key, Blocked_Contacts.list[i].pub_key, TOX_CLIENT_ID_SIZE);
uint8_t lastonline[sizeof(uint64_t)];
memcpy(lastonline, &Blocked_Contacts.list[i].last_on, sizeof(uint64_t));
host_to_net(lastonline, sizeof(uint64_t));
memcpy(&tmp.last_on, lastonline, sizeof(uint64_t));
memcpy(data + count * sizeof(BlockedFriend), &tmp, sizeof(BlockedFriend));
++count;
}
}
FILE *fp = fopen(path, "wb");
if (fp == NULL) {
free(data);
return -1;
}
int ret = 0;
if (fwrite(data, len, 1, fp) != 1)
ret = -1;
fclose(fp);
free(data);
return ret;
}
/**@brief this function receives an arp message from outside and processes it
* @param fins_received is the pointer to the fins frame which has been received by the ARP module
*/
void arp_in(struct finsFrame *fins_received){
struct ARP_message *arp_msg_ptr;
fins_arp_in = fins_received;
/**request or reply received from the network and as transmitted by the ethernet stub*/
if (fins_arp_in->dataOrCtrl == DATA && (fins_arp_in->destinationID.id == (unsigned char) ARPID))
{
fins_to_arp(fins_arp_in, packet); //extract arp hdr from the fins frame
host_to_net(packet); //convert it into the right format (e.g. htons issue etc.)
arp_msg_ptr = &arp_msg;
arp_hdr_to_msg(packet, arp_msg_ptr); //convert the hdr into an internal ARP message (e.g. use uint64_t instead of unsigned char)
print_msgARP(arp_msg_ptr);
if (check_valid_arp(arp_msg_ptr)==1){
update_cache(arp_msg_ptr);
if ((arp_msg_ptr->target_IP_addrs==interface_IP_addrs) && (arp_msg_ptr->operation==ARPREQUESTOP))
arp_out(REPLYDATA);//generate reply
else if ((arp_msg_ptr->target_IP_addrs==interface_IP_addrs) && (arp_msg_ptr->operation==ARPREPLYOP))
{ target_IP_addrs = arp_msg.sender_IP_addrs;
arp_out(REPLYCONTROL);//generate fins control carrying neighbor's MAC address
}
}
}
else if ((fins_arp_in->dataOrCtrl == CONTROL) && (fins_arp_in->ctrlFrame.opcode == WRITEREQUEST)
&& (fins_arp_in->destinationID.id == (unsigned char) ARPID))
{/**as a request received from the ethernet stub-- IP address is provided in this fins control frame*/
memcpy(fins_IP_address, fins_arp_in->ctrlFrame.paramterValue, PROTOCOLADDRSLEN);
target_IP_addrs = gen_IP_addrs(fins_IP_address[0],fins_IP_address[1],fins_IP_address[2],fins_IP_address[3]);
/**request initiated by the ethernet stub*/
if (search_list(ptr_cacheHeader, target_IP_addrs)==0)//i.e. not found
arp_out(REQUESTDATA); //generate arp request for MAC address and send out to the network
else
arp_out(REPLYCONTROL);//generate fins control carrying MAC address foe ethernet
}
print_cache();
}
/* Send the packets to tell our friends what our DHT public key is.
*
* if onion_dht_both is 0, use only the onion to send the packet.
* if it is 1, use only the dht.
* if it is something else, use both.
*
* return the number of packets sent on success
* return -1 on failure.
*/
static int send_fakeid_announce(const Onion_Client *onion_c, uint16_t friend_num, uint8_t onion_dht_both)
{
if (friend_num >= onion_c->num_friends)
return -1;
uint8_t data[FAKEID_DATA_MAX_LENGTH];
data[0] = FAKEID_DATA_ID;
uint64_t no_replay = unix_time();
host_to_net((uint8_t *)&no_replay, sizeof(no_replay));
memcpy(data + 1, &no_replay, sizeof(no_replay));
memcpy(data + 1 + sizeof(uint64_t), onion_c->dht->self_public_key, crypto_box_PUBLICKEYBYTES);
Node_format nodes[MAX_SENT_NODES];
uint16_t num_relays = copy_connected_tcp_relays(onion_c->c, nodes, (MAX_SENT_NODES / 2));
uint16_t num_nodes = closelist_nodes(onion_c->dht, &nodes[num_relays], MAX_SENT_NODES - num_relays);
num_nodes += num_relays;
int nodes_len = 0;
if (num_nodes != 0) {
nodes_len = pack_nodes(data + FAKEID_DATA_MIN_LENGTH, FAKEID_DATA_MAX_LENGTH - FAKEID_DATA_MIN_LENGTH, nodes,
num_nodes);
if (nodes_len <= 0)
return -1;
}
int num1 = -1, num2 = -1;
if (onion_dht_both != 1)
num1 = send_onion_data(onion_c, friend_num, data, FAKEID_DATA_MIN_LENGTH + nodes_len);
if (onion_dht_both != 0)
num2 = send_dht_fakeid(onion_c, friend_num, data, FAKEID_DATA_MIN_LENGTH + nodes_len);
if (num1 == -1)
return num2;
if (num2 == -1)
return num1;
return num1 + num2;
}