diff --git a/core/DHT.c b/core/DHT.c index 857ac5e8..79bcbfcb 100644 --- a/core/DHT.c +++ b/core/DHT.c @@ -94,15 +94,12 @@ int id_closest(uint8_t * client_id, uint8_t * client_id1, uint8_t * client_id2) { uint32_t i; for(i = 0; i < CLIENT_ID_SIZE; ++i) { - if(abs(client_id[i] ^ client_id1[i]) < abs(client_id[i] ^ client_id2[i])) { + if(abs(client_id[i] ^ client_id1[i]) < abs(client_id[i] ^ client_id2[i])) return 1; - } else if(abs(client_id[i] ^ client_id1[i]) > abs(client_id[i] ^ client_id2[i])) { + else if(abs(client_id[i] ^ client_id1[i]) > abs(client_id[i] ^ client_id2[i])) return 2; - } } - return 0; - } /* check if client with client_id is already in list of length length. @@ -114,14 +111,14 @@ int client_in_list(Client_data * list, uint32_t length, uint8_t * client_id, IP_ { uint32_t i; uint32_t temp_time = unix_time(); - + for(i = 0; i < length; ++i) { /*If ip_port is assigned to a different client_id replace it*/ if(list[i].ip_port.ip.i == ip_port.ip.i && list[i].ip_port.port == ip_port.port) { memcpy(list[i].client_id, client_id, CLIENT_ID_SIZE); } - + if(memcmp(list[i].client_id, client_id, CLIENT_ID_SIZE) == 0) { /* Refresh the client timestamp. */ list[i].timestamp = temp_time; @@ -131,7 +128,7 @@ int client_in_list(Client_data * list, uint32_t length, uint8_t * client_id, IP_ } } return 0; - + } /* check if client with client_id is already in node format list of length length. @@ -139,14 +136,10 @@ int client_in_list(Client_data * list, uint32_t length, uint8_t * client_id, IP_ int client_in_nodelist(Node_format * list, uint32_t length, uint8_t * client_id) { uint32_t i; - for(i = 0; i < length; ++i) { - if(memcmp(list[i].client_id, client_id, CLIENT_ID_SIZE) == 0) { - + for(i = 0; i < length; ++i) + if(memcmp(list[i].client_id, client_id, CLIENT_ID_SIZE) == 0) return 1; - } - } return 0; - } /*Return the friend number from the client_id @@ -154,12 +147,9 @@ int client_in_nodelist(Node_format * list, uint32_t length, uint8_t * client_id) static int friend_number(uint8_t * client_id) { uint32_t i; - for(i = 0; i < num_friends; ++i) { + for(i = 0; i < num_friends; ++i) if(memcmp(friends_list[i].client_id, client_id, CLIENT_ID_SIZE) == 0) /* Equal */ - { return i; - } - } return -1; } @@ -176,7 +166,7 @@ int get_close_nodes(uint8_t * client_id, Node_format * nodes_list) uint32_t i, j, k; int num_nodes=0; uint32_t temp_time = unix_time(); - for(i = 0; i < LCLIENT_LIST; ++i) { + for(i = 0; i < LCLIENT_LIST; ++i) if(close_clientlist[i].timestamp + BAD_NODE_TIMEOUT > temp_time && !client_in_nodelist(nodes_list, MAX_SENT_NODES,close_clientlist[i].client_id)) { /* if node is good and not already in list. */ @@ -185,17 +175,16 @@ int get_close_nodes(uint8_t * client_id, Node_format * nodes_list) nodes_list[num_nodes].ip_port = close_clientlist[i].ip_port; num_nodes++; } - else for(j = 0; j < MAX_SENT_NODES; ++j) { + else for(j = 0; j < MAX_SENT_NODES; ++j) if(id_closest(client_id, nodes_list[j].client_id, close_clientlist[i].client_id) == 2) { memcpy(nodes_list[j].client_id, close_clientlist[i].client_id, CLIENT_ID_SIZE); nodes_list[j].ip_port = close_clientlist[i].ip_port; break; } - } - } - } - for(i = 0; i < num_friends; ++i) { - for(j = 0; j < MAX_FRIEND_CLIENTS; ++j) { + } + + for(i = 0; i < num_friends; ++i) + for(j = 0; j < MAX_FRIEND_CLIENTS; ++j) if(friends_list[i].client_list[j].timestamp + BAD_NODE_TIMEOUT > temp_time && !client_in_nodelist(nodes_list, MAX_SENT_NODES,friends_list[i].client_list[j].client_id)) { /* if node is good and not already in list. */ @@ -203,17 +192,13 @@ int get_close_nodes(uint8_t * client_id, Node_format * nodes_list) memcpy(nodes_list[num_nodes].client_id, friends_list[i].client_list[j].client_id, CLIENT_ID_SIZE); nodes_list[num_nodes].ip_port = friends_list[i].client_list[j].ip_port; num_nodes++; - } else for(k = 0; k < MAX_SENT_NODES; ++k) { + } else for(k = 0; k < MAX_SENT_NODES; ++k) if(id_closest(client_id, nodes_list[k].client_id, friends_list[i].client_list[j].client_id) == 2) { memcpy(nodes_list[k].client_id, friends_list[i].client_list[j].client_id, CLIENT_ID_SIZE); nodes_list[k].ip_port = friends_list[i].client_list[j].ip_port; break; } - } } - } - } - return num_nodes; } @@ -224,7 +209,7 @@ int replace_bad(Client_data * list, uint32_t length, uint8_t * client_id, IP_Por { uint32_t i; uint32_t temp_time = unix_time(); - for(i = 0; i < length; ++i) { + for(i = 0; i < length; ++i) if(list[i].timestamp + BAD_NODE_TIMEOUT < temp_time) /* if node is bad. */ { memcpy(list[i].client_id, client_id, CLIENT_ID_SIZE); list[i].ip_port = ip_port; @@ -234,9 +219,8 @@ int replace_bad(Client_data * list, uint32_t length, uint8_t * client_id, IP_Por list[i].ret_timestamp = 0; return 0; } - } + return 1; - } /* replace the first good node that is further to the comp_client_id than that of the client_id in the list */ @@ -245,7 +229,7 @@ int replace_good(Client_data * list, uint32_t length, uint8_t * client_id, IP_Po uint32_t i; uint32_t temp_time = unix_time(); - for(i = 0; i < length; ++i) { + for(i = 0; i < length; ++i) if(id_closest(comp_client_id, list[i].client_id, client_id) == 2) { memcpy(list[i].client_id, client_id, CLIENT_ID_SIZE); list[i].ip_port = ip_port; @@ -255,9 +239,8 @@ int replace_good(Client_data * list, uint32_t length, uint8_t * client_id, IP_Po list[i].ret_timestamp = 0; return 0; } - } + return 1; - } /* Attempt to add client with ip_port and client_id to the friends client list and close_clientlist */ @@ -266,21 +249,16 @@ void addto_lists(IP_Port ip_port, uint8_t * client_id) uint32_t i; /* NOTE: current behavior if there are two clients with the same id is to replace the first ip by the second. */ - if(!client_in_list(close_clientlist, LCLIENT_LIST, client_id, ip_port)) { - - if(replace_bad(close_clientlist, LCLIENT_LIST, client_id, ip_port)) { + if(!client_in_list(close_clientlist, LCLIENT_LIST, client_id, ip_port)) + if(replace_bad(close_clientlist, LCLIENT_LIST, client_id, ip_port)) /* if we can't replace bad nodes we try replacing good ones */ replace_good(close_clientlist, LCLIENT_LIST, client_id, ip_port, self_public_key); - } - } - for(i = 0; i < num_friends; ++i) { - if(!client_in_list(friends_list[i].client_list, MAX_FRIEND_CLIENTS, client_id, ip_port)) { - if(replace_bad(friends_list[i].client_list, MAX_FRIEND_CLIENTS, client_id, ip_port)) { + + for(i = 0; i < num_friends; ++i) + if(!client_in_list(friends_list[i].client_list, MAX_FRIEND_CLIENTS, client_id, ip_port)) + if(replace_bad(friends_list[i].client_list, MAX_FRIEND_CLIENTS, client_id, ip_port)) /* if we can't replace bad nodes we try replacing good ones. */ replace_good(friends_list[i].client_list, MAX_FRIEND_CLIENTS, client_id, ip_port, friends_list[i].client_id); - } - } - } } /* If client_id is a friend or us, update ret_ip_port @@ -289,27 +267,22 @@ void returnedip_ports(IP_Port ip_port, uint8_t * client_id, uint8_t * nodeclient { uint32_t i, j; uint32_t temp_time = unix_time(); - if(memcmp(client_id, self_public_key, CLIENT_ID_SIZE) == 0) { - for(i = 0; i < LCLIENT_LIST; ++i) { + if(memcmp(client_id, self_public_key, CLIENT_ID_SIZE) == 0) + for(i = 0; i < LCLIENT_LIST; ++i) if(memcmp(nodeclient_id, close_clientlist[i].client_id, CLIENT_ID_SIZE) == 0) { close_clientlist[i].ret_ip_port = ip_port; close_clientlist[i].ret_timestamp = temp_time; return; } - } - } else - for(i = 0; i < num_friends; ++i) { - if(memcmp(client_id, friends_list[i].client_id, CLIENT_ID_SIZE) == 0) { - for(j = 0; j < MAX_FRIEND_CLIENTS; ++j) { + for(i = 0; i < num_friends; ++i) + if(memcmp(client_id, friends_list[i].client_id, CLIENT_ID_SIZE) == 0) + for(j = 0; j < MAX_FRIEND_CLIENTS; ++j) if(memcmp(nodeclient_id, friends_list[i].client_list[j].client_id, CLIENT_ID_SIZE) == 0) { friends_list[i].client_list[j].ret_ip_port = ip_port; friends_list[i].client_list[j].ret_timestamp = temp_time; return; } - } - } - } } /* ping timeout in seconds */ @@ -326,30 +299,21 @@ int is_pinging(IP_Port ip_port, uint64_t ping_id) uint8_t pinging; uint32_t temp_time = unix_time(); - for(i = 0; i < LPING_ARRAY; ++i ) { + for(i = 0; i < LPING_ARRAY; ++i ) if((pings[i].timestamp + PING_TIMEOUT) > temp_time) { pinging = 0; - if(ip_port.ip.i != 0) { + if(ip_port.ip.i != 0) if(pings[i].ip_port.ip.i == ip_port.ip.i && - pings[i].ip_port.port == ip_port.port) { + pings[i].ip_port.port == ip_port.port) ++pinging; - } - } - if(ping_id != 0) { + if(ping_id != 0) if(pings[i].ping_id == ping_id) - { ++pinging; - } - } - if(pinging == (ping_id != 0) + (ip_port.ip.i != 0)) { + if(pinging == (ping_id != 0) + (ip_port.ip.i != 0)) return 1; - } - } - } return 0; - } /* Same as last function but for get_node requests. */ @@ -359,29 +323,22 @@ int is_gettingnodes(IP_Port ip_port, uint64_t ping_id) uint8_t pinging; uint32_t temp_time = unix_time(); - for(i = 0; i < LSEND_NODES_ARRAY; ++i ) { + for(i = 0; i < LSEND_NODES_ARRAY; ++i ) if((send_nodes[i].timestamp + PING_TIMEOUT) > temp_time) { pinging = 0; - if(ip_port.ip.i != 0) { + if(ip_port.ip.i != 0) if(send_nodes[i].ip_port.ip.i == ip_port.ip.i && - send_nodes[i].ip_port.port == ip_port.port) { + send_nodes[i].ip_port.port == ip_port.port) ++pinging; - } - } - if(ping_id != 0) { - if(send_nodes[i].ping_id == ping_id) { - ++pinging; - } - } - if(pinging == (ping_id != 0) + (ip_port.ip.i != 0)) { - return 1; - } + if(ping_id != 0) + if(send_nodes[i].ping_id == ping_id) + ++pinging; + if(pinging == (ping_id != 0) + (ip_port.ip.i != 0)) + return 1; } - } return 0; - } /* Add a new ping request to the list of ping requests @@ -393,19 +350,17 @@ uint64_t add_pinging(IP_Port ip_port) uint32_t i, j; uint64_t ping_id = ((uint64_t)random_int() << 32) + random_int(); uint32_t temp_time = unix_time(); - - for(i = 0; i < PING_TIMEOUT; ++i ) { - for(j = 0; j < LPING_ARRAY; ++j ) { + + for(i = 0; i < PING_TIMEOUT; ++i ) + for(j = 0; j < LPING_ARRAY; ++j ) if((pings[j].timestamp + PING_TIMEOUT - i) < temp_time) { pings[j].timestamp = temp_time; pings[j].ip_port = ip_port; pings[j].ping_id = ping_id; return ping_id; } - } - } + return 0; - } /* Same but for get node requests */ @@ -414,99 +369,86 @@ uint64_t add_gettingnodes(IP_Port ip_port) uint32_t i, j; uint64_t ping_id = ((uint64_t)random_int() << 32) + random_int(); uint32_t temp_time = unix_time(); - - for(i = 0; i < PING_TIMEOUT; ++i ) { - for(j = 0; j < LSEND_NODES_ARRAY; ++j ) { + + for(i = 0; i < PING_TIMEOUT; ++i ) + for(j = 0; j < LSEND_NODES_ARRAY; ++j ) if((send_nodes[j].timestamp + PING_TIMEOUT - i) < temp_time) { send_nodes[j].timestamp = temp_time; send_nodes[j].ip_port = ip_port; send_nodes[j].ping_id = ping_id; return ping_id; } - } - } + return 0; - } /* send a ping request Ping request only works if none has been sent to that ip/port in the last 5 seconds. */ static int pingreq(IP_Port ip_port, uint8_t * public_key) { - if(memcmp(public_key, self_public_key, CLIENT_ID_SIZE) == 0) /* check if packet is gonna be sent to ourself */ { + if(memcmp(public_key, self_public_key, CLIENT_ID_SIZE) == 0) /* check if packet is gonna be sent to ourself */ return 1; - } - - if(is_pinging(ip_port, 0)) { + + if(is_pinging(ip_port, 0)) return 1; - } - + uint64_t ping_id = add_pinging(ip_port); - if(ping_id == 0) { + if(ping_id == 0) return 1; - } - + uint8_t data[1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + sizeof(ping_id) + ENCRYPTION_PADDING]; uint8_t encrypt[sizeof(ping_id) + ENCRYPTION_PADDING]; uint8_t nonce[crypto_box_NONCEBYTES]; random_nonce(nonce); - + int len = encrypt_data(public_key, self_secret_key, nonce, (uint8_t *)&ping_id, sizeof(ping_id), encrypt); - if(len != sizeof(ping_id) + ENCRYPTION_PADDING) { + if(len != sizeof(ping_id) + ENCRYPTION_PADDING) return -1; - } data[0] = 0; memcpy(data + 1, self_public_key, CLIENT_ID_SIZE); memcpy(data + 1 + CLIENT_ID_SIZE, nonce, crypto_box_NONCEBYTES); memcpy(data + 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES, encrypt, len); - + return sendpacket(ip_port, data, sizeof(data)); - } /* send a ping response */ static int pingres(IP_Port ip_port, uint8_t * public_key, uint64_t ping_id) { /* check if packet is gonna be sent to ourself */ - if(memcmp(public_key, self_public_key, CLIENT_ID_SIZE) == 0) { + if(memcmp(public_key, self_public_key, CLIENT_ID_SIZE) == 0) return 1; - } - + uint8_t data[1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + sizeof(ping_id) + ENCRYPTION_PADDING]; uint8_t encrypt[sizeof(ping_id) + ENCRYPTION_PADDING]; uint8_t nonce[crypto_box_NONCEBYTES]; random_nonce(nonce); - + int len = encrypt_data(public_key, self_secret_key, nonce, (uint8_t *)&ping_id, sizeof(ping_id), encrypt); - if(len != sizeof(ping_id) + ENCRYPTION_PADDING) { + if(len != sizeof(ping_id) + ENCRYPTION_PADDING) return -1; - } data[0] = 1; memcpy(data + 1, self_public_key, CLIENT_ID_SIZE); memcpy(data + 1 + CLIENT_ID_SIZE, nonce, crypto_box_NONCEBYTES); memcpy(data + 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES, encrypt, len); return sendpacket(ip_port, data, sizeof(data)); - } /* send a getnodes request */ static int getnodes(IP_Port ip_port, uint8_t * public_key, uint8_t * client_id) { /* check if packet is gonna be sent to ourself */ - if(memcmp(public_key, self_public_key, CLIENT_ID_SIZE) == 0) { + if(memcmp(public_key, self_public_key, CLIENT_ID_SIZE) == 0) return 1; - } - if(is_gettingnodes(ip_port, 0)) { + if(is_gettingnodes(ip_port, 0)) return 1; - } uint64_t ping_id = add_gettingnodes(ip_port); - if(ping_id == 0) { + if(ping_id == 0) return 1; - } uint8_t data[1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + sizeof(ping_id) + CLIENT_ID_SIZE + ENCRYPTION_PADDING]; uint8_t plain[sizeof(ping_id) + CLIENT_ID_SIZE]; @@ -519,34 +461,30 @@ static int getnodes(IP_Port ip_port, uint8_t * public_key, uint8_t * client_id) int len = encrypt_data(public_key, self_secret_key, nonce, plain, sizeof(ping_id) + CLIENT_ID_SIZE, encrypt); - if(len != sizeof(ping_id) + CLIENT_ID_SIZE + ENCRYPTION_PADDING) { + if(len != sizeof(ping_id) + CLIENT_ID_SIZE + ENCRYPTION_PADDING) return -1; - } data[0] = 2; memcpy(data + 1, self_public_key, CLIENT_ID_SIZE); memcpy(data + 1 + CLIENT_ID_SIZE, nonce, crypto_box_NONCEBYTES); memcpy(data + 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES, encrypt, len); return sendpacket(ip_port, data, sizeof(data)); - } /* send a send nodes response */ static int sendnodes(IP_Port ip_port, uint8_t * public_key, uint8_t * client_id, uint64_t ping_id) { - if(memcmp(public_key, self_public_key, CLIENT_ID_SIZE) == 0) /* check if packet is gonna be sent to ourself */ { + if(memcmp(public_key, self_public_key, CLIENT_ID_SIZE) == 0) /* check if packet is gonna be sent to ourself */ return 1; - } - + uint8_t data[1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + sizeof(ping_id) + sizeof(Node_format) * MAX_SENT_NODES + ENCRYPTION_PADDING]; - + Node_format nodes_list[MAX_SENT_NODES]; int num_nodes = get_close_nodes(client_id, nodes_list); - - if(num_nodes == 0) { + + if(num_nodes == 0) return 0; - } - + uint8_t plain[sizeof(ping_id) + sizeof(Node_format) * MAX_SENT_NODES]; uint8_t encrypt[sizeof(ping_id) + sizeof(Node_format) * MAX_SENT_NODES + ENCRYPTION_PADDING]; uint8_t nonce[crypto_box_NONCEBYTES]; @@ -558,17 +496,15 @@ static int sendnodes(IP_Port ip_port, uint8_t * public_key, uint8_t * client_id, int len = encrypt_data(public_key, self_secret_key, nonce, plain, sizeof(ping_id) + num_nodes * sizeof(Node_format), encrypt); - if(len != sizeof(ping_id) + num_nodes * sizeof(Node_format) + ENCRYPTION_PADDING) { + if(len != sizeof(ping_id) + num_nodes * sizeof(Node_format) + ENCRYPTION_PADDING) return -1; - } data[0] = 3; memcpy(data + 1, self_public_key, CLIENT_ID_SIZE); memcpy(data + 1 + CLIENT_ID_SIZE, nonce, crypto_box_NONCEBYTES); memcpy(data + 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES, encrypt, len); - + return sendpacket(ip_port, data, 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + len); - } /* Packet handling functions @@ -577,50 +513,38 @@ static int sendnodes(IP_Port ip_port, uint8_t * public_key, uint8_t * client_id, int handle_pingreq(uint8_t * packet, uint32_t length, IP_Port source) { uint64_t ping_id; - if(length != 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + sizeof(ping_id) + ENCRYPTION_PADDING) { + if(length != 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + sizeof(ping_id) + ENCRYPTION_PADDING) return 1; - } /* check if packet is from ourself. */ - if(memcmp(packet + 1, self_public_key, CLIENT_ID_SIZE) == 0) { + if(memcmp(packet + 1, self_public_key, CLIENT_ID_SIZE) == 0) return 1; - } - - - + int len = decrypt_data(packet + 1, self_secret_key, packet + 1 + CLIENT_ID_SIZE, packet + 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES, sizeof(ping_id) + ENCRYPTION_PADDING, (uint8_t *)&ping_id); - if(len != sizeof(ping_id)) { + if(len != sizeof(ping_id)) return 1; - } - pingres(source, packet + 1, ping_id); - + pingreq(source, packet + 1); /* TODO: make this smarter? */ - + return 0; - } int handle_pingres(uint8_t * packet, uint32_t length, IP_Port source) { uint64_t ping_id; - if(length != 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + sizeof(ping_id) + ENCRYPTION_PADDING) { + if(length != 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + sizeof(ping_id) + ENCRYPTION_PADDING) return 1; - } - if(memcmp(packet + 1, self_public_key, CLIENT_ID_SIZE) == 0) /* check if packet is from ourself. */ { + if(memcmp(packet + 1, self_public_key, CLIENT_ID_SIZE) == 0) /* check if packet is from ourself. */ return 1; - } - - - + int len = decrypt_data(packet + 1, self_secret_key, packet + 1 + CLIENT_ID_SIZE, packet + 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES, sizeof(ping_id) + ENCRYPTION_PADDING, (uint8_t *)&ping_id); - if(len != sizeof(ping_id)) { + if(len != sizeof(ping_id)) return 1; - } if(is_pinging(source, ping_id)) { addto_lists(source, packet + 1); @@ -633,37 +557,34 @@ int handle_pingres(uint8_t * packet, uint32_t length, IP_Port source) int handle_getnodes(uint8_t * packet, uint32_t length, IP_Port source) { uint64_t ping_id; - if(length != 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + sizeof(ping_id) + CLIENT_ID_SIZE + ENCRYPTION_PADDING) { + if(length != 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + sizeof(ping_id) + CLIENT_ID_SIZE + ENCRYPTION_PADDING) return 1; - } /* check if packet is from ourself. */ - if(memcmp(packet + 1, self_public_key, CLIENT_ID_SIZE) == 0) { + if(memcmp(packet + 1, self_public_key, CLIENT_ID_SIZE) == 0) return 1; - } - + uint8_t plain[sizeof(ping_id) + CLIENT_ID_SIZE]; - + int len = decrypt_data(packet + 1, self_secret_key, packet + 1 + CLIENT_ID_SIZE, packet + 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES, sizeof(ping_id) + CLIENT_ID_SIZE + ENCRYPTION_PADDING, plain); - - if(len != sizeof(ping_id) + CLIENT_ID_SIZE) { + + if(len != sizeof(ping_id) + CLIENT_ID_SIZE) return 1; - } - - + memcpy(&ping_id, plain, sizeof(ping_id)); sendnodes(source, packet + 1, plain + sizeof(ping_id), ping_id); - + pingreq(source, packet + 1); /* TODO: make this smarter? */ - + return 0; } int handle_sendnodes(uint8_t * packet, uint32_t length, IP_Port source) { - uint64_t ping_id; + uint64_t ping_id + /* TODO: make this more readable */ if(length > (1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + sizeof(ping_id) + sizeof(Node_format) * MAX_SENT_NODES + ENCRYPTION_PADDING) || (length - (1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + sizeof(ping_id) @@ -671,37 +592,34 @@ int handle_sendnodes(uint8_t * packet, uint32_t length, IP_Port source) length < 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + sizeof(ping_id) + sizeof(Node_format) + ENCRYPTION_PADDING) { return 1; - } + } uint32_t num_nodes = (length - (1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + sizeof(ping_id) + ENCRYPTION_PADDING)) / sizeof(Node_format); - + uint8_t plain[sizeof(ping_id) + sizeof(Node_format) * MAX_SENT_NODES]; - + int len = decrypt_data(packet + 1, self_secret_key, packet + 1 + CLIENT_ID_SIZE, packet + 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES, sizeof(ping_id) + num_nodes * sizeof(Node_format) + ENCRYPTION_PADDING, plain); - - - if(len != sizeof(ping_id) + num_nodes * sizeof(Node_format)) { + + if(len != sizeof(ping_id) + num_nodes * sizeof(Node_format)) return 1; - } - + memcpy(&ping_id, plain, sizeof(ping_id)); - if(!is_gettingnodes(source, ping_id)) { + if(!is_gettingnodes(source, ping_id)) return 1; - } - + Node_format nodes_list[MAX_SENT_NODES]; memcpy(nodes_list, plain + sizeof(ping_id), num_nodes * sizeof(Node_format)); - + addto_lists(source, packet + 1); - + uint32_t i; for(i = 0; i < num_nodes; ++i) { pingreq(nodes_list[i].ip_port, nodes_list[i].client_id); returnedip_ports(nodes_list[i].ip_port, nodes_list[i].client_id, packet + 1); } - + return 0; } @@ -710,15 +628,13 @@ int handle_sendnodes(uint8_t * packet, uint32_t length, IP_Port source) int DHT_addfriend(uint8_t * client_id) { Friend * temp; - if(num_friends == 0) { + if(num_friends == 0) temp = malloc(sizeof(Friend)); - } else { + else temp = realloc(friends_list, sizeof(Friend) * (num_friends + 1)); - } - if(temp == NULL) { + if(temp == NULL) return 1; - } - + friends_list = temp; memset(&friends_list[num_friends], 0, sizeof(Friend)); memcpy(friends_list[num_friends].client_id, client_id, CLIENT_ID_SIZE); @@ -731,20 +647,18 @@ int DHT_delfriend(uint8_t * client_id) { uint32_t i; Friend * temp; - for(i = 0; i < num_friends; ++i) { + for(i = 0; i < num_friends; ++i) /* Equal */ - if(memcmp(friends_list[i].client_id, client_id, CLIENT_ID_SIZE) == 0){ + if(memcmp(friends_list[i].client_id, client_id, CLIENT_ID_SIZE) == 0) { --num_friends; - if(num_friends != i) { + if(num_friends != i) memcpy(friends_list[i].client_id, friends_list[num_friends].client_id, CLIENT_ID_SIZE); - } temp = realloc(friends_list, sizeof(Friend) * (num_friends)); - if(temp != NULL) { + if(temp != NULL) friends_list = temp; - } return 0; } - } + return 1; } @@ -754,18 +668,16 @@ IP_Port DHT_getfriendip(uint8_t * client_id) uint32_t i, j; IP_Port empty = {{{0}}, 0}; uint32_t temp_time = unix_time(); - for(i = 0; i < num_friends; ++i) { + for(i = 0; i < num_friends; ++i) /* Equal */ if(memcmp(friends_list[i].client_id, client_id, CLIENT_ID_SIZE) == 0) { - for(j = 0; j < MAX_FRIEND_CLIENTS; ++j) { + for(j = 0; j < MAX_FRIEND_CLIENTS; ++j) if(memcmp(friends_list[i].client_list[j].client_id, client_id, CLIENT_ID_SIZE) == 0 && - friends_list[i].client_list[j].timestamp + BAD_NODE_TIMEOUT > temp_time) { + friends_list[i].client_list[j].timestamp + BAD_NODE_TIMEOUT > temp_time) return friends_list[i].client_list[j].ip_port; - } - } + return empty; } - } empty.ip.i = 1; return empty; @@ -791,7 +703,7 @@ void doDHTFriends() for(i = 0; i < num_friends; ++i) { uint32_t num_nodes = 0; - for(j = 0; j < MAX_FRIEND_CLIENTS; ++j) { + for(j = 0; j < MAX_FRIEND_CLIENTS; ++j) if(friends_list[i].client_list[j].timestamp + Kill_NODE_TIMEOUT > temp_time) /* if node is not dead. */ { if((friends_list[i].client_list[j].last_pinged + PING_INTERVAL) <= temp_time) { pingreq(friends_list[i].client_list[j].ip_port, friends_list[i].client_list[j].client_id); @@ -802,7 +714,6 @@ void doDHTFriends() ++num_nodes; } } - } if(friends_list[i].lastgetnode + GET_NODE_INTERVAL <= temp_time && num_nodes != 0) { rand_node = rand() % num_nodes; getnodes(friends_list[i].client_list[index[rand_node]].ip_port, @@ -825,11 +736,10 @@ void doClose() /* tested */ uint32_t rand_node; uint32_t index[LCLIENT_LIST]; - for(i = 0; i < LCLIENT_LIST; ++i) { + for(i = 0; i < LCLIENT_LIST; ++i) /* if node is not dead. */ if(close_clientlist[i].timestamp + Kill_NODE_TIMEOUT > temp_time) { - if((close_clientlist[i].last_pinged + PING_INTERVAL) <= temp_time) - { + if((close_clientlist[i].last_pinged + PING_INTERVAL) <= temp_time) { pingreq(close_clientlist[i].ip_port, close_clientlist[i].client_id); close_clientlist[i].last_pinged = temp_time; } @@ -838,8 +748,7 @@ void doClose() /* tested */ index[num_nodes] = i; ++num_nodes; } - } - } + } if(close_lastgetnodes + GET_NODE_INTERVAL <= temp_time && num_nodes != 0) { rand_node = rand() % num_nodes; @@ -860,11 +769,9 @@ void DHT_bootstrap(IP_Port ip_port, uint8_t * public_key) int route_packet(uint8_t * client_id, uint8_t * packet, uint32_t length) { uint32_t i; - for(i = 0; i < LCLIENT_LIST; ++i) { - if(memcmp(client_id, close_clientlist[i].client_id, CLIENT_ID_SIZE) == 0) { + for(i = 0; i < LCLIENT_LIST; ++i) + if(memcmp(client_id, close_clientlist[i].client_id, CLIENT_ID_SIZE) == 0) return sendpacket(close_clientlist[i].ip_port, packet, length); - } - } return -1; } @@ -878,21 +785,17 @@ static int friend_iplist(IP_Port * ip_portlist, uint16_t friend_num) int num_ips = 0; uint32_t i; uint32_t temp_time = unix_time(); - if(friend_num >= num_friends) { + if(friend_num >= num_friends) return -1; - } for(i = 0; i < MAX_FRIEND_CLIENTS; ++i) - { /*If ip is not zero and node is good */ if(friends_list[friend_num].client_list[i].ret_ip_port.ip.i != 0 && friends_list[friend_num].client_list[i].ret_timestamp + BAD_NODE_TIMEOUT > temp_time) { - if(memcmp(friends_list[friend_num].client_list[i].client_id, friends_list[friend_num].client_id, CLIENT_ID_SIZE) == 0 ) { + if(memcmp(friends_list[friend_num].client_list[i].client_id, friends_list[friend_num].client_id, CLIENT_ID_SIZE) == 0 ) return 0; - } ip_portlist[num_ips] = friends_list[friend_num].client_list[i].ret_ip_port; ++num_ips; } - } return num_ips; } @@ -903,21 +806,17 @@ int route_tofriend(uint8_t * friend_id, uint8_t * packet, uint32_t length) uint32_t i, j; uint32_t sent = 0; uint32_t temp_time = unix_time(); - for(i = 0; i < num_friends; ++i) { + for(i = 0; i < num_friends; ++i) /* Equal */ if(memcmp(friends_list[i].client_id, friend_id, CLIENT_ID_SIZE) == 0) { - for(j = 0; j < MAX_FRIEND_CLIENTS; ++j) { + for(j = 0; j < MAX_FRIEND_CLIENTS; ++j) /*If ip is not zero and node is good */ if(friends_list[i].client_list[j].ret_ip_port.ip.i != 0 && - friends_list[i].client_list[j].ret_timestamp + BAD_NODE_TIMEOUT > temp_time) { - if(sendpacket(friends_list[i].client_list[j].ip_port, packet, length) == length) { + friends_list[i].client_list[j].ret_timestamp + BAD_NODE_TIMEOUT > temp_time) + if(sendpacket(friends_list[i].client_list[j].ip_port, packet, length) == length) ++sent; - } - } - } return sent; } - } return 0; } @@ -926,28 +825,24 @@ int route_tofriend(uint8_t * friend_id, uint8_t * packet, uint32_t length) int routeone_tofriend(uint8_t * friend_id, uint8_t * packet, uint32_t length) { int num = friend_number(friend_id); - if(num == -1) { + if(num == -1) return 0; - } IP_Port ip_list[MAX_FRIEND_CLIENTS]; int n = 0; uint32_t i; uint32_t temp_time = unix_time(); - for(i = 0; i < MAX_FRIEND_CLIENTS; ++i) { + for(i = 0; i < MAX_FRIEND_CLIENTS; ++i) /*If ip is not zero and node is good */ if(friends_list[num].client_list[i].ret_ip_port.ip.i != 0 && friends_list[num].client_list[i].ret_timestamp + BAD_NODE_TIMEOUT > temp_time) { ip_list[n] = friends_list[num].client_list[i].ip_port; ++n; } - } - if(n < 1) { + if(n < 1) return 0; - } - if(sendpacket(ip_list[rand() % n], packet, length) == length) { + if(sendpacket(ip_list[rand() % n], packet, length) == length) return 1; - } return 0; } @@ -960,12 +855,10 @@ int friend_ips(IP_Port * ip_portlist, uint8_t * friend_id) { uint32_t i; - for(i = 0; i < num_friends; ++i) { + for(i = 0; i < num_friends; ++i) /* Equal */ - if(memcmp(friends_list[i].client_id, friend_id, CLIENT_ID_SIZE) == 0) { + if(memcmp(friends_list[i].client_id, friend_id, CLIENT_ID_SIZE) == 0) return friend_iplist(ip_portlist, i); - } - } return -1; } @@ -979,19 +872,17 @@ int send_NATping(uint8_t * public_key, uint64_t ping_id, uint8_t type) uint8_t packet[MAX_DATA_SIZE]; int len = create_request(packet, public_key, data, sizeof(uint64_t) + 1, 254); /* 254 is NAT ping request packet id */ - if(len == -1) { + if(len == -1) return -1; - } + int num = 0; - if(type == 0) { + + if(type == 0) num = route_tofriend(public_key, packet, len);/*If packet is request use many people to route it*/ - } - else if(type == 1) { + else if(type == 1) num = routeone_tofriend(public_key, packet, len);/*If packet is response use only one person to route it*/ - } - if(num == 0) { + if(num == 0) return -1; - } return num; } @@ -999,44 +890,37 @@ int send_NATping(uint8_t * public_key, uint64_t ping_id, uint8_t type) int handle_NATping(uint8_t * packet, uint32_t length, IP_Port source) { if(length <= crypto_box_PUBLICKEYBYTES * 2 + crypto_box_NONCEBYTES + 1 + ENCRYPTION_PADDING && - length > MAX_DATA_SIZE + ENCRYPTION_PADDING) { + length > MAX_DATA_SIZE + ENCRYPTION_PADDING) return 1; - } /* check if request is for us. */ if(memcmp(packet + 1, self_public_key, crypto_box_PUBLICKEYBYTES) == 0) { uint8_t public_key[crypto_box_PUBLICKEYBYTES]; uint8_t data[MAX_DATA_SIZE]; int len = handle_request(public_key, data, packet, length); - if(len != sizeof(uint64_t) + 1) { + if(len != sizeof(uint64_t) + 1) return 1; - } uint64_t ping_id; memcpy(&ping_id, data + 1, sizeof(uint64_t)); int friendnumber = friend_number(public_key); - if(friendnumber == -1) { + if(friendnumber == -1) return 1; - } - if(data[0] == 0) { + if(data[0] == 0) send_NATping(public_key, ping_id, 1);/*1 is reply*/ return 0; - } else if (data[0] == 1) { - if(friends_list[friendnumber].NATping_id == ping_id) - { + else if (data[0] == 1) + if(friends_list[friendnumber].NATping_id == ping_id) { friends_list[friendnumber].NATping_id = ((uint64_t)random_int() << 32) + random_int(); friends_list[friendnumber].hole_punching = 1; return 0; } - } return 1; } /* if request is not for us, try routing it. */ - else { - if(route_packet(packet + 1, packet, length) == length) { + else + if(route_packet(packet + 1, packet, length) == length) return 0; - } - } return 0; } @@ -1047,21 +931,17 @@ int handle_NATping(uint8_t * packet, uint32_t length, IP_Port source) static IP NAT_commonip(IP_Port * ip_portlist, uint16_t len, uint16_t min_num) { IP zero = {{0}}; - if(len > MAX_FRIEND_CLIENTS) { + if(len > MAX_FRIEND_CLIENTS) return zero; - } uint32_t i, j; uint16_t numbers[MAX_FRIEND_CLIENTS] = {0}; for(i = 0; i < len; ++i) { - for(j = 0; j < len; ++j) { - if(ip_portlist[i].ip.i == ip_portlist[j].ip.i) { + for(j = 0; j < len; ++j) + if(ip_portlist[i].ip.i == ip_portlist[j].ip.i) ++numbers[i]; - } - } - if(numbers[i] >= min_num) { + if(numbers[i] >= min_num) return ip_portlist[i].ip; - } } return zero; } @@ -1074,12 +954,11 @@ static uint16_t NAT_getports(uint16_t * portlist, IP_Port * ip_portlist, uint16_ { uint32_t i; uint16_t num = 0; - for(i = 0; i < len; ++i) { + for(i = 0; i < len; ++i) if(ip_portlist[i].ip.i == ip.i) { portlist[num] = ntohs(ip_portlist[i].port); ++num; } - } return num; } @@ -1087,9 +966,8 @@ static uint16_t NAT_getports(uint16_t * portlist, IP_Port * ip_portlist, uint16_ static void punch_holes(IP ip, uint16_t * port_list, uint16_t numports, uint16_t friend_num) { - if(numports > MAX_FRIEND_CLIENTS || numports == 0) { + if(numports > MAX_FRIEND_CLIENTS || numports == 0) return; - } uint32_t i; uint32_t top = friends_list[friend_num].punching_index + MAX_PUNCHING_PORTS; for(i = friends_list[friend_num].punching_index; i != top; i++) { @@ -1112,9 +990,9 @@ static void doNAT() IP_Port ip_list[MAX_FRIEND_CLIENTS]; int num = friend_iplist(ip_list, i); /*If we are connected to friend or if friend is not online don't try to hole punch with him*/ - if(num < MAX_FRIEND_CLIENTS/2) { + if(num < MAX_FRIEND_CLIENTS/2) continue; - } + if(friends_list[i].hole_punching != 1) { if(friends_list[i].NATping_timestamp + PUNCH_INTERVAL < temp_time) { send_NATping(friends_list[i].client_id, friends_list[i].NATping_id, 0); /*0 is request*/ @@ -1123,9 +1001,9 @@ static void doNAT() } else if(friends_list[i].punching_timestamp + PUNCH_INTERVAL < temp_time) { IP ip = NAT_commonip(ip_list, num, MAX_FRIEND_CLIENTS/2); - if(ip.i == 0) { + if(ip.i == 0) continue; - } + uint16_t port_list[MAX_FRIEND_CLIENTS]; uint16_t numports = NAT_getports(port_list, ip_list, num, ip); punch_holes(ip, port_list, numports, i); @@ -1162,7 +1040,6 @@ int DHT_handlepacket(uint8_t * packet, uint32_t length, IP_Port source) } return 0; - } void doDHT() @@ -1190,12 +1067,10 @@ void DHT_save(uint8_t * data) return 0 if success */ int DHT_load(uint8_t * data, uint32_t size) { - if(size < sizeof(close_clientlist)) { + if(size < sizeof(close_clientlist)) return -1; - } - if((size - sizeof(close_clientlist)) % sizeof(Friend) != 0) { + if((size - sizeof(close_clientlist)) % sizeof(Friend) != 0) return -1; - } uint32_t i, j; /* uint32_t temp_time = unix_time(); */ uint16_t temp; @@ -1207,21 +1082,18 @@ int DHT_load(uint8_t * data, uint32_t size) for(i = 0; i < temp; ++i) { DHT_addfriend(tempfriends_list[i].client_id); - for(j = 0; j < MAX_FRIEND_CLIENTS; ++j) { + for(j = 0; j < MAX_FRIEND_CLIENTS; ++j) if(tempfriends_list[i].client_list[j].timestamp != 0) { getnodes(tempfriends_list[i].client_list[j].ip_port, tempfriends_list[i].client_list[j].client_id, tempfriends_list[i].client_id); } - } } } Client_data * tempclose_clientlist = (Client_data *)data; - for(i = 0; i < LCLIENT_LIST; ++i) { - if(tempclose_clientlist[i].timestamp != 0) { + for(i = 0; i < LCLIENT_LIST; ++i) + if(tempclose_clientlist[i].timestamp != 0) DHT_bootstrap(tempclose_clientlist[i].ip_port, tempclose_clientlist[i].client_id); - } - } return 0; } @@ -1231,10 +1103,8 @@ int DHT_isconnected() { uint32_t i; uint32_t temp_time = unix_time(); - for(i = 0; i < LCLIENT_LIST; ++i) { - if(close_clientlist[i].timestamp + BAD_NODE_TIMEOUT > temp_time) { + for(i = 0; i < LCLIENT_LIST; ++i) + if(close_clientlist[i].timestamp + BAD_NODE_TIMEOUT > temp_time) return 1; - } - } return 0; -} \ No newline at end of file +}