/* * Datatypes, functions and includes for the core networking. */ /* * Copyright © 2016-2018 The TokTok team. * Copyright © 2013 Tox project. * * This file is part of Tox, the free peer to peer instant messenger. * * Tox is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * Tox is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Tox. If not, see . */ #ifndef NETWORK_H #define NETWORK_H #include "logger.h" #include // bool #include // size_t #include // uint*_t #ifdef __cplusplus extern "C" { #endif typedef struct Family { uint8_t value; } Family; bool net_family_is_unspec(Family family); bool net_family_is_ipv4(Family family); bool net_family_is_ipv6(Family family); bool net_family_is_tcp_family(Family family); bool net_family_is_tcp_onion(Family family); bool net_family_is_tcp_ipv4(Family family); bool net_family_is_tcp_ipv6(Family family); bool net_family_is_tox_tcp_ipv4(Family family); bool net_family_is_tox_tcp_ipv6(Family family); extern const Family net_family_unspec; extern const Family net_family_ipv4; extern const Family net_family_ipv6; extern const Family net_family_tcp_family; extern const Family net_family_tcp_onion; extern const Family net_family_tcp_ipv4; extern const Family net_family_tcp_ipv6; extern const Family net_family_tox_tcp_ipv4; extern const Family net_family_tox_tcp_ipv6; typedef struct Socket { int socket; } Socket; Socket net_socket(Family domain, int type, int protocol); /** * Check if socket is valid. * * @return true if valid, false otherwise. */ bool sock_valid(Socket sock); extern const Socket net_invalid_socket; /** * Calls send(sockfd, buf, len, MSG_NOSIGNAL). */ int net_send(Socket sock, const void *buf, size_t len); /** * Calls recv(sockfd, buf, len, MSG_NOSIGNAL). */ int net_recv(Socket sock, void *buf, size_t len); /** * Calls listen(sockfd, backlog). */ int net_listen(Socket sock, int backlog); /** * Calls accept(sockfd, nullptr, nullptr). */ Socket net_accept(Socket sock); /** * return the amount of data in the tcp recv buffer. * return 0 on failure. */ size_t net_socket_data_recv_buffer(Socket sock); #define MAX_UDP_PACKET_SIZE 2048 typedef enum Net_Packet_Type { NET_PACKET_PING_REQUEST = 0x00, /* Ping request packet ID. */ NET_PACKET_PING_RESPONSE = 0x01, /* Ping response packet ID. */ NET_PACKET_GET_NODES = 0x02, /* Get nodes request packet ID. */ NET_PACKET_SEND_NODES_IPV6 = 0x04, /* Send nodes response packet ID for other addresses. */ NET_PACKET_COOKIE_REQUEST = 0x18, /* Cookie request packet */ NET_PACKET_COOKIE_RESPONSE = 0x19, /* Cookie response packet */ NET_PACKET_CRYPTO_HS = 0x1a, /* Crypto handshake packet */ NET_PACKET_CRYPTO_DATA = 0x1b, /* Crypto data packet */ NET_PACKET_CRYPTO = 0x20, /* Encrypted data packet ID. */ NET_PACKET_LAN_DISCOVERY = 0x21, /* LAN discovery packet ID. */ /* See: docs/Prevent_Tracking.txt and onion.{c,h} */ NET_PACKET_ONION_SEND_INITIAL = 0x80, NET_PACKET_ONION_SEND_1 = 0x81, NET_PACKET_ONION_SEND_2 = 0x82, NET_PACKET_ANNOUNCE_REQUEST = 0x83, NET_PACKET_ANNOUNCE_RESPONSE = 0x84, NET_PACKET_ONION_DATA_REQUEST = 0x85, NET_PACKET_ONION_DATA_RESPONSE = 0x86, NET_PACKET_ONION_RECV_3 = 0x8c, NET_PACKET_ONION_RECV_2 = 0x8d, NET_PACKET_ONION_RECV_1 = 0x8e, BOOTSTRAP_INFO_PACKET_ID = 0xf0, /* Only used for bootstrap nodes */ NET_PACKET_MAX = 0xff, /* This type must remain within a single uint8. */ } Net_Packet_Type; #define TOX_PORTRANGE_FROM 33445 #define TOX_PORTRANGE_TO 33545 #define TOX_PORT_DEFAULT TOX_PORTRANGE_FROM /* Redefinitions of variables for safe transfer over wire. */ #define TOX_AF_UNSPEC 0 #define TOX_AF_INET 2 #define TOX_AF_INET6 10 #define TOX_TCP_INET 130 #define TOX_TCP_INET6 138 #define TOX_SOCK_STREAM 1 #define TOX_SOCK_DGRAM 2 #define TOX_PROTO_TCP 1 #define TOX_PROTO_UDP 2 /* TCP related */ #define TCP_ONION_FAMILY (TOX_AF_INET6 + 1) #define TCP_INET (TOX_AF_INET6 + 2) #define TCP_INET6 (TOX_AF_INET6 + 3) #define TCP_FAMILY (TOX_AF_INET6 + 4) typedef union IP4 { uint32_t uint32; uint16_t uint16[2]; uint8_t uint8[4]; } IP4; IP4 get_ip4_loopback(void); extern const IP4 ip4_broadcast; typedef union IP6 { uint8_t uint8[16]; uint16_t uint16[8]; uint32_t uint32[4]; uint64_t uint64[2]; } IP6; IP6 get_ip6_loopback(void); extern const IP6 ip6_broadcast; typedef union IP_Union { IP4 v4; IP6 v6; } IP_Union; #define IP_DEFINED typedef struct IP { Family family; IP_Union ip; } IP; #define IP_PORT_DEFINED typedef struct IP_Port { IP ip; uint16_t port; } IP_Port; /* Convert values between host and network byte order. */ uint32_t net_htonl(uint32_t hostlong); uint16_t net_htons(uint16_t hostshort); uint32_t net_ntohl(uint32_t hostlong); uint16_t net_ntohs(uint16_t hostshort); size_t net_pack_u16(uint8_t *bytes, uint16_t v); size_t net_pack_u32(uint8_t *bytes, uint32_t v); size_t net_pack_u64(uint8_t *bytes, uint64_t v); size_t net_unpack_u16(const uint8_t *bytes, uint16_t *v); size_t net_unpack_u32(const uint8_t *bytes, uint32_t *v); size_t net_unpack_u64(const uint8_t *bytes, uint64_t *v); /* Does the IP6 struct a contain an IPv4 address in an IPv6 one? */ bool ipv6_ipv4_in_v6(IP6 a); #define SIZE_IP4 4 #define SIZE_IP6 16 #define SIZE_IP (1 + SIZE_IP6) #define SIZE_PORT 2 #define SIZE_IPPORT (SIZE_IP + SIZE_PORT) #define TOX_ENABLE_IPV6_DEFAULT true /* addr_resolve return values */ #define TOX_ADDR_RESOLVE_INET 1 #define TOX_ADDR_RESOLVE_INET6 2 #define TOX_INET6_ADDRSTRLEN 66 #define TOX_INET_ADDRSTRLEN 22 /* ip_ntoa * converts ip into a string * ip_str must be of length at least IP_NTOA_LEN * * IPv6 addresses are enclosed into square brackets, i.e. "[IPv6]" * writes error message into the buffer on error * * returns ip_str */ /* this would be TOX_INET6_ADDRSTRLEN, but it might be too short for the error message */ #define IP_NTOA_LEN 96 // TODO(irungentoo): magic number. Why not INET6_ADDRSTRLEN ? const char *ip_ntoa(const IP *ip, char *ip_str, size_t length); /** * Parses IP structure into an address string. * * @param ip IP of TOX_AF_INET or TOX_AF_INET6 families. * @param length length of the address buffer. * Must be at least TOX_INET_ADDRSTRLEN for TOX_AF_INET * and TOX_INET6_ADDRSTRLEN for TOX_AF_INET6 * * @param address dotted notation (IPv4: quad, IPv6: 16) or colon notation (IPv6). * * @return true on success, false on failure. */ bool ip_parse_addr(const IP *ip, char *address, size_t length); /** * Directly parses the input into an IP structure. * * Tries IPv4 first, then IPv6. * * @param address dotted notation (IPv4: quad, IPv6: 16) or colon notation (IPv6). * @param to family and the value is set on success. * * @return true on success, false on failure. */ bool addr_parse_ip(const char *address, IP *to); /** * Compares two IPAny structures. * * Unset means unequal. * * @return false when not equal or when uninitialized. */ bool ip_equal(const IP *a, const IP *b); /** * Compares two IPAny_Port structures. * * Unset means unequal. * * @return false when not equal or when uninitialized. */ bool ipport_equal(const IP_Port *a, const IP_Port *b); /* nulls out ip */ void ip_reset(IP *ip); /* nulls out ip, sets family according to flag */ void ip_init(IP *ip, bool ipv6enabled); /* checks if ip is valid */ bool ip_isset(const IP *ip); /* checks if ip is valid */ bool ipport_isset(const IP_Port *ipport); /* copies an ip structure */ void ip_copy(IP *target, const IP *source); /* copies an ip_port structure */ void ipport_copy(IP_Port *target, const IP_Port *source); /** * Uses getaddrinfo to resolve an address into an IP address. * * Uses the first IPv4/IPv6 addresses returned by getaddrinfo. * * @param address a hostname (or something parseable to an IP address) * @param to to.family MUST be initialized, either set to a specific IP version * (TOX_AF_INET/TOX_AF_INET6) or to the unspecified TOX_AF_UNSPEC (= 0), if both * IP versions are acceptable * @param extra can be NULL and is only set in special circumstances, see returns * * returns in *to a valid IPAny (v4/v6), * prefers v6 if ip.family was TOX_AF_UNSPEC and both available * returns in *extra an IPv4 address, if family was TOX_AF_UNSPEC and *to is TOX_AF_INET6 * * @return 0 on failure, TOX_ADDR_RESOLVE_* on success. */ int addr_resolve(const char *address, IP *to, IP *extra); /** * Resolves string into an IP address * * @param address a hostname (or something parseable to an IP address) * @param to to.family MUST be initialized, either set to a specific IP version * (TOX_AF_INET/TOX_AF_INET6) or to the unspecified TOX_AF_UNSPEC (= 0), if both * IP versions are acceptable * @param extra can be NULL and is only set in special circumstances, see returns * * returns in *tro a matching address (IPv6 or IPv4) * returns in *extra, if not NULL, an IPv4 address, if to->family was TOX_AF_UNSPEC * * @return true on success, false on failure */ bool addr_resolve_or_parse_ip(const char *address, IP *to, IP *extra); /* Function to receive data, ip and port of sender is put into ip_port. * Packet data is put into data. * Packet length is put into length. */ typedef int packet_handler_cb(void *object, IP_Port ip_port, const uint8_t *data, uint16_t len, void *userdata); typedef struct Networking_Core Networking_Core; Family net_family(const Networking_Core *net); uint16_t net_port(const Networking_Core *net); /* Run this before creating sockets. * * return 0 on success * return -1 on failure */ int networking_at_startup(void); /* Close the socket. */ void kill_sock(Socket sock); /** * Set socket as nonblocking * * @return true on success, false on failure. */ bool set_socket_nonblock(Socket sock); /** * Set socket to not emit SIGPIPE * * @return true on success, false on failure. */ bool set_socket_nosigpipe(Socket sock); /** * Enable SO_REUSEADDR on socket. * * @return true on success, false on failure. */ bool set_socket_reuseaddr(Socket sock); /** * Set socket to dual (IPv4 + IPv6 socket) * * @return true on success, false on failure. */ bool set_socket_dualstack(Socket sock); /* Basic network functions: */ /* Function to send packet(data) of length length to ip_port. */ int sendpacket(Networking_Core *net, IP_Port ip_port, const uint8_t *data, uint16_t length); /* Function to call when packet beginning with byte is received. */ void networking_registerhandler(Networking_Core *net, uint8_t byte, packet_handler_cb *cb, void *object); /* Call this several times a second. */ void networking_poll(Networking_Core *net, void *userdata); /* Connect a socket to the address specified by the ip_port. */ int net_connect(Socket sock, IP_Port ip_port); /* High-level getaddrinfo implementation. * Given node, which identifies an Internet host, net_getipport() fills an array * with one or more IP_Port structures, each of which contains an Internet * address that can be specified by calling net_connect(), the port is ignored. * * Skip all addresses with socktype != type (use type = -1 to get all addresses) * To correctly deallocate array memory use net_freeipport() * * return number of elements in res array * and -1 on error. */ int32_t net_getipport(const char *node, IP_Port **res, int tox_type); /* Deallocates memory allocated by net_getipport */ void net_freeipport(IP_Port *ip_ports); /** * @return true on success, false on failure. */ bool bind_to_port(Socket sock, Family family, uint16_t port); /* Get the last networking error code. * * Similar to Unix's errno, but cross-platform, as not all platforms use errno * to indicate networking errors. * * Note that different platforms may return different codes for the same error, * so you likely shouldn't be checking the value returned by this function * unless you know what you are doing, you likely just want to use it in * combination with net_new_strerror() to print the error. * * return platform-dependent network error code, if any. */ int net_error(void); /* Get a text explanation for the error code from net_error(). * * return NULL on failure. * return pointer to a NULL-terminated string describing the error code on * success. The returned string must be freed using net_kill_strerror(). */ const char *net_new_strerror(int error); /* Frees the string returned by net_new_strerror(). * It's valid to pass NULL as the argument, the function does nothing in this * case. */ void net_kill_strerror(const char *strerror); /* Initialize networking. * bind to ip and port. * ip must be in network order EX: 127.0.0.1 = (7F000001). * port is in host byte order (this means don't worry about it). * * return Networking_Core object if no problems * return NULL if there are problems. * * If error is non NULL it is set to 0 if no issues, 1 if socket related error, 2 if other. */ Networking_Core *new_networking(const Logger *log, IP ip, uint16_t port); Networking_Core *new_networking_ex(const Logger *log, IP ip, uint16_t port_from, uint16_t port_to, unsigned int *error); Networking_Core *new_networking_no_udp(const Logger *log); /* Function to cleanup networking stuff (doesn't do much right now). */ void kill_networking(Networking_Core *net); #ifdef __cplusplus } // extern "C" #endif #endif