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979b4bfb48
toxcore/toxcore/network.c
irungentoo 93a998d15a
Code cleanups. 
Moved some functions to onion.c.

Fixed possible portability issues.
2015-01-01 21:30:42 -05:00

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/* network.c
*
* Functions for the core networking.
*
* Copyright (C) 2013 Tox project All Rights Reserved.
*
* This file is part of Tox.
*
* 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 <http://www.gnu.org/licenses/>.
*
*/
#if (_WIN32_WINNT >= _WIN32_WINNT_WINXP)
#define _WIN32_WINNT 0x501
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "logger.h"
#if !defined(_WIN32) && !defined(__WIN32__) && !defined (WIN32)
#include <errno.h>
#endif
#ifdef __APPLE__
#include <mach/clock.h>
#include <mach/mach.h>
#endif
#include "network.h"
#include "util.h"
#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
static const char *inet_ntop(sa_family_t family, void *addr, char *buf, size_t bufsize)
{
if (family == AF_INET) {
struct sockaddr_in saddr;
memset(&saddr, 0, sizeof(saddr));
saddr.sin_family = AF_INET;
saddr.sin_addr = *(struct in_addr *)addr;
DWORD len = bufsize;
if (WSAAddressToString((LPSOCKADDR)&saddr, sizeof(saddr), NULL, buf, &len))
return NULL;
return buf;
} else if (family == AF_INET6) {
struct sockaddr_in6 saddr;
memset(&saddr, 0, sizeof(saddr));
saddr.sin6_family = AF_INET6;
saddr.sin6_addr = *(struct in6_addr *)addr;
DWORD len = bufsize;
if (WSAAddressToString((LPSOCKADDR)&saddr, sizeof(saddr), NULL, buf, &len))
return NULL;
return buf;
}
return NULL;
}
static int inet_pton(sa_family_t family, const char *addrString, void *addrbuf)
{
if (family == AF_INET) {
struct sockaddr_in saddr;
memset(&saddr, 0, sizeof(saddr));
INT len = sizeof(saddr);
if (WSAStringToAddress((LPTSTR)addrString, AF_INET, NULL, (LPSOCKADDR)&saddr, &len))
return 0;
*(struct in_addr *)addrbuf = saddr.sin_addr;
return 1;
} else if (family == AF_INET6) {
struct sockaddr_in6 saddr;
memset(&saddr, 0, sizeof(saddr));
INT len = sizeof(saddr);
if (WSAStringToAddress((LPTSTR)addrString, AF_INET6, NULL, (LPSOCKADDR)&saddr, &len))
return 0;
*(struct in6_addr *)addrbuf = saddr.sin6_addr;
return 1;
}
return 0;
}
#endif
/* Check if socket is valid.
*
* return 1 if valid
* return 0 if not valid
*/
int sock_valid(sock_t sock)
{
#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
if (sock == INVALID_SOCKET) {
#else
if (sock < 0) {
#endif
return 0;
}
return 1;
}
/* Close the socket.
*/
void kill_sock(sock_t sock)
{
#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
closesocket(sock);
#else
close(sock);
#endif
}
/* Set socket as nonblocking
*
* return 1 on success
* return 0 on failure
*/
int set_socket_nonblock(sock_t sock)
{
#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
u_long mode = 1;
return (ioctlsocket(sock, FIONBIO, &mode) == 0);
#else
return (fcntl(sock, F_SETFL, O_NONBLOCK, 1) == 0);
#endif
}
/* Set socket to not emit SIGPIPE
*
* return 1 on success
* return 0 on failure
*/
int set_socket_nosigpipe(sock_t sock)
{
#if defined(__MACH__)
int set = 1;
return (setsockopt(sock, SOL_SOCKET, SO_NOSIGPIPE, (void *)&set, sizeof(int)) == 0);
#else
return 1;
#endif
}
/* Set socket to dual (IPv4 + IPv6 socket)
*
* return 1 on success
* return 0 on failure
*/
int set_socket_dualstack(sock_t sock)
{
int ipv6only = 0;
socklen_t optsize = sizeof(ipv6only);
int res = getsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&ipv6only, &optsize);
if ((res == 0) && (ipv6only == 0))
return 1;
ipv6only = 0;
return (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&ipv6only, sizeof(ipv6only)) == 0);
}
/* return current UNIX time in microseconds (us). */
static uint64_t current_time_actual(void)
{
uint64_t time;
#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
/* This probably works fine */
FILETIME ft;
GetSystemTimeAsFileTime(&ft);
time = ft.dwHighDateTime;
time <<= 32;
time |= ft.dwLowDateTime;
time -= 116444736000000000ULL;
return time / 10;
#else
struct timeval a;
gettimeofday(&a, NULL);
time = 1000000ULL * a.tv_sec + a.tv_usec;
return time;
#endif
}
#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
static uint64_t last_monotime;
static uint64_t add_monotime;
#endif
/* return current monotonic time in milliseconds (ms). */
uint64_t current_time_monotonic(void)
{
uint64_t time;
#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
time = (uint64_t)GetTickCount() + add_monotime;
if (time < last_monotime) { /* Prevent time from ever decreasing because of 32 bit wrap. */
uint32_t add = ~0;
add_monotime += add;
time += add;
}
last_monotime = time;
#else
struct timespec monotime;
#if defined(__linux__) && defined(CLOCK_MONOTONIC_RAW)
clock_gettime(CLOCK_MONOTONIC_RAW, &monotime);
#elif defined(__APPLE__)
clock_serv_t muhclock;
mach_timespec_t machtime;
host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &muhclock);
clock_get_time(muhclock, &machtime);
mach_port_deallocate(mach_task_self(), muhclock);
monotime.tv_sec = machtime.tv_sec;
monotime.tv_nsec = machtime.tv_nsec;
#else
clock_gettime(CLOCK_MONOTONIC, &monotime);
#endif
time = 1000ULL * monotime.tv_sec + (monotime.tv_nsec / 1000000ULL);
#endif
return time;
}
/* In case no logging */
#ifndef LOGGING
#define loglogdata(__message__, __buffer__, __buflen__, __ip_port__, __res__)
#else
#define data_0(__buflen__, __buffer__) __buflen__ > 4 ? ntohl(*(uint32_t *)&__buffer__[1]) : 0
#define data_1(__buflen__, __buffer__) __buflen__ > 7 ? ntohl(*(uint32_t *)&__buffer__[5]) : 0
#define loglogdata(__message__, __buffer__, __buflen__, __ip_port__, __res__) \
(__ip_port__) .ip; \
if (__res__ < 0) /* Windows doesn't necessarily know %zu */ \
LOGGER_INFO("[%2u] %s %3hu%c %s:%hu (%u: %s) | %04x%04x", \
__buffer__[0], __message__, (__buflen__ < 999 ? (uint16_t)__buflen__ : 999), 'E', \
ip_ntoa(&((__ip_port__).ip)), ntohs((__ip_port__).port), errno, strerror(errno), data_0(__buflen__, __buffer__), data_1(__buflen__, __buffer__)); \
else if ((__res__ > 0) && ((size_t)__res__ <= __buflen__)) \
LOGGER_INFO("[%2u] %s %3zu%c %s:%hu (%u: %s) | %04x%04x", \
__buffer__[0], __message__, (__res__ < 999 ? (size_t)__res__ : 999), ((size_t)__res__ < __buflen__ ? '<' : '='), \
ip_ntoa(&((__ip_port__).ip)), ntohs((__ip_port__).port), 0, "OK", data_0(__buflen__, __buffer__), data_1(__buflen__, __buffer__)); \
else /* empty or overwrite */ \
LOGGER_INFO("[%2u] %s %zu%c%zu %s:%hu (%u: %s) | %04x%04x", \
__buffer__[0], __message__, (size_t)__res__, (!__res__ ? '!' : '>'), __buflen__, \
ip_ntoa(&((__ip_port__).ip)), ntohs((__ip_port__).port), 0, "OK", data_0(__buflen__, __buffer__), data_1(__buflen__, __buffer__));
#endif /* LOGGING */
/* 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)
{
if (net->family == 0) /* Socket not initialized */
return -1;
/* socket AF_INET, but target IP NOT: can't send */
if ((net->family == AF_INET) && (ip_port.ip.family != AF_INET))
return -1;
struct sockaddr_storage addr;
size_t addrsize = 0;
if (ip_port.ip.family == AF_INET) {
if (net->family == AF_INET6) {
/* must convert to IPV4-in-IPV6 address */
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&addr;
addrsize = sizeof(struct sockaddr_in6);
addr6->sin6_family = AF_INET6;
addr6->sin6_port = ip_port.port;
/* there should be a macro for this in a standards compliant
* environment, not found */
IP6 ip6;
ip6.uint32[0] = 0;
ip6.uint32[1] = 0;
ip6.uint32[2] = htonl(0xFFFF);
ip6.uint32[3] = ip_port.ip.ip4.uint32;
addr6->sin6_addr = ip6.in6_addr;
addr6->sin6_flowinfo = 0;
addr6->sin6_scope_id = 0;
} else {
struct sockaddr_in *addr4 = (struct sockaddr_in *)&addr;
addrsize = sizeof(struct sockaddr_in);
addr4->sin_family = AF_INET;
addr4->sin_addr = ip_port.ip.ip4.in_addr;
addr4->sin_port = ip_port.port;
}
} else if (ip_port.ip.family == AF_INET6) {
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&addr;
addrsize = sizeof(struct sockaddr_in6);
addr6->sin6_family = AF_INET6;
addr6->sin6_port = ip_port.port;
addr6->sin6_addr = ip_port.ip.ip6.in6_addr;
addr6->sin6_flowinfo = 0;
addr6->sin6_scope_id = 0;
} else {
/* unknown address type*/
return -1;
}
int res = sendto(net->sock, (char *) data, length, 0, (struct sockaddr *)&addr, addrsize);
loglogdata("O=>", data, length, ip_port, res);
return res;
}
/* 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.
*/
static int receivepacket(sock_t sock, IP_Port *ip_port, uint8_t *data, uint32_t *length)
{
memset(ip_port, 0, sizeof(IP_Port));
struct sockaddr_storage addr;
#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
int addrlen = sizeof(addr);
#else
socklen_t addrlen = sizeof(addr);
#endif
*length = 0;
int fail_or_len = recvfrom(sock, (char *) data, MAX_UDP_PACKET_SIZE, 0, (struct sockaddr *)&addr, &addrlen);
if (fail_or_len < 0) {
LOGGER_SCOPE( if ((fail_or_len < 0) && (errno != EWOULDBLOCK))
LOGGER_ERROR("Unexpected error reading from socket: %u, %s\n", errno, strerror(errno)); );
return -1; /* Nothing received. */
}
*length = (uint32_t)fail_or_len;
if (addr.ss_family == AF_INET) {
struct sockaddr_in *addr_in = (struct sockaddr_in *)&addr;
ip_port->ip.family = addr_in->sin_family;
ip_port->ip.ip4.in_addr = addr_in->sin_addr;
ip_port->port = addr_in->sin_port;
} else if (addr.ss_family == AF_INET6) {
struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)&addr;
ip_port->ip.family = addr_in6->sin6_family;
ip_port->ip.ip6.in6_addr = addr_in6->sin6_addr;
ip_port->port = addr_in6->sin6_port;
if (IPV6_IPV4_IN_V6(ip_port->ip.ip6)) {
ip_port->ip.family = AF_INET;
ip_port->ip.ip4.uint32 = ip_port->ip.ip6.uint32[3];
}
} else
return -1;
loglogdata("=>O", data, MAX_UDP_PACKET_SIZE, *ip_port, *length);
return 0;
}
void networking_registerhandler(Networking_Core *net, uint8_t byte, packet_handler_callback cb, void *object)
{
net->packethandlers[byte].function = cb;
net->packethandlers[byte].object = object;
}
void networking_poll(Networking_Core *net)
{
if (net->family == 0) /* Socket not initialized */
return;
unix_time_update();
IP_Port ip_port;
uint8_t data[MAX_UDP_PACKET_SIZE];
uint32_t length;
while (receivepacket(net->sock, &ip_port, data, &length) != -1) {
if (length < 1) continue;
if (!(net->packethandlers[data[0]].function)) {
LOGGER_WARNING("[%02u] -- Packet has no handler", data[0]);
continue;
}
net->packethandlers[data[0]].function(net->packethandlers[data[0]].object, ip_port, data, length);
}
}
#ifndef VANILLA_NACL
/* Used for sodium_init() */
#include <sodium.h>
#endif
uint8_t at_startup_ran = 0;
int networking_at_startup(void)
{
if (at_startup_ran != 0)
return 0;
#ifndef VANILLA_NACL
#ifdef USE_RANDOMBYTES_STIR
randombytes_stir();
#else
sodium_init();
#endif /*USE_RANDOMBYTES_STIR*/
#endif/*VANILLA_NACL*/
#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
WSADATA wsaData;
if (WSAStartup(MAKEWORD(2, 2), &wsaData) != NO_ERROR)
return -1;
#endif
srand((uint32_t)current_time_actual());
at_startup_ran = 1;
return 0;
}
/* TODO: Put this somewhere
static void at_shutdown(void)
{
#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
WSACleanup();
#endif
}
*/
/* 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.
*/
Networking_Core *new_networking(IP ip, uint16_t port)
{
/* maybe check for invalid IPs like 224+.x.y.z? if there is any IP set ever */
if (ip.family != AF_INET && ip.family != AF_INET6) {
#ifdef DEBUG
fprintf(stderr, "Invalid address family: %u\n", ip.family);
#endif
return NULL;
}
if (networking_at_startup() != 0)
return NULL;
Networking_Core *temp = calloc(1, sizeof(Networking_Core));
if (temp == NULL)
return NULL;
temp->family = ip.family;
temp->port = 0;
/* Initialize our socket. */
/* add log message what we're creating */
temp->sock = socket(temp->family, SOCK_DGRAM, IPPROTO_UDP);
/* Check for socket error. */
if (!sock_valid(temp->sock)) {
#ifdef DEBUG
fprintf(stderr, "Failed to get a socket?! %u, %s\n", errno, strerror(errno));
#endif
free(temp);
return NULL;
}
/* Functions to increase the size of the send and receive UDP buffers.
*/
int n = 1024 * 1024 * 2;
setsockopt(temp->sock, SOL_SOCKET, SO_RCVBUF, (char *)&n, sizeof(n));
setsockopt(temp->sock, SOL_SOCKET, SO_SNDBUF, (char *)&n, sizeof(n));
/* Enable broadcast on socket */
int broadcast = 1;
setsockopt(temp->sock, SOL_SOCKET, SO_BROADCAST, (char *)&broadcast, sizeof(broadcast));
/* iOS UDP sockets are weird and apparently can SIGPIPE */
if (!set_socket_nosigpipe(temp->sock)) {
kill_networking(temp);
return NULL;
}
/* Set socket nonblocking. */
if (!set_socket_nonblock(temp->sock)) {
kill_networking(temp);
return NULL;
}
/* Bind our socket to port PORT and the given IP address (usually 0.0.0.0 or ::) */
uint16_t *portptr = NULL;
struct sockaddr_storage addr;
size_t addrsize;
if (temp->family == AF_INET) {
struct sockaddr_in *addr4 = (struct sockaddr_in *)&addr;
addrsize = sizeof(struct sockaddr_in);
addr4->sin_family = AF_INET;
addr4->sin_port = 0;
addr4->sin_addr = ip.ip4.in_addr;
portptr = &addr4->sin_port;
} else if (temp->family == AF_INET6) {
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&addr;
addrsize = sizeof(struct sockaddr_in6);
addr6->sin6_family = AF_INET6;
addr6->sin6_port = 0;
addr6->sin6_addr = ip.ip6.in6_addr;
addr6->sin6_flowinfo = 0;
addr6->sin6_scope_id = 0;
portptr = &addr6->sin6_port;
} else {
free(temp);
return NULL;
}
if (ip.family == AF_INET6) {
#ifdef LOGGING
int is_dualstack =
#endif /* LOGGING */
set_socket_dualstack(temp->sock);
LOGGER_DEBUG( "Dual-stack socket: %s",
is_dualstack ? "enabled" : "Failed to enable, won't be able to receive from/send to IPv4 addresses" );
/* multicast local nodes */
struct ipv6_mreq mreq;
memset(&mreq, 0, sizeof(mreq));
mreq.ipv6mr_multiaddr.s6_addr[ 0] = 0xFF;
mreq.ipv6mr_multiaddr.s6_addr[ 1] = 0x02;
mreq.ipv6mr_multiaddr.s6_addr[15] = 0x01;
mreq.ipv6mr_interface = 0;
#ifdef LOGGING
int res =
#endif /* LOGGING */
setsockopt(temp->sock, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, (char *)&mreq, sizeof(mreq));
LOGGER_DEBUG(res < 0 ? "Failed to activate local multicast membership. (%u, %s)" :
"Local multicast group FF02::1 joined successfully", errno, strerror(errno) );
}
/* a hanging program or a different user might block the standard port;
* as long as it isn't a parameter coming from the commandline,
* try a few ports after it, to see if we can find a "free" one
*
* if we go on without binding, the first sendto() automatically binds to
* a free port chosen by the system (i.e. anything from 1024 to 65535)
*
* returning NULL after bind fails has both advantages and disadvantages:
* advantage:
* we can rely on getting the port in the range 33445..33450, which
* enables us to tell joe user to open their firewall to a small range
*
* disadvantage:
* some clients might not test return of tox_new(), blindly assuming that
* it worked ok (which it did previously without a successful bind)
*/
uint16_t port_to_try = port;
*portptr = htons(port_to_try);
int tries;
for (tries = TOX_PORTRANGE_FROM; tries <= TOX_PORTRANGE_TO; tries++) {
int res = bind(temp->sock, (struct sockaddr *)&addr, addrsize);
if (!res) {
temp->port = *portptr;
LOGGER_DEBUG("Bound successfully to %s:%u", ip_ntoa(&ip), ntohs(temp->port));
/* errno isn't reset on success, only set on failure, the failed
* binds with parallel clients yield a -EPERM to the outside if
* errno isn't cleared here */
if (tries > 0)
errno = 0;
return temp;
}
port_to_try++;
if (port_to_try > TOX_PORTRANGE_TO)
port_to_try = TOX_PORTRANGE_FROM;
*portptr = htons(port_to_try);
}
#ifdef DEBUG
fprintf(stderr, "Failed to bind socket: %u, %s (IP/Port: %s:%u\n", errno,
strerror(errno), ip_ntoa(&ip), port);
#endif
kill_networking(temp);
return NULL;
}
/* Function to cleanup networking stuff. */
void kill_networking(Networking_Core *net)
{
if (net->family != 0) /* Socket not initialized */
kill_sock(net->sock);
free(net);
return;
}
/* ip_equal
* compares two IPAny structures
* unset means unequal
*
* returns 0 when not equal or when uninitialized
*/
int ip_equal(const IP *a, const IP *b)
{
if (!a || !b)
return 0;
/* same family */
if (a->family == b->family) {
if (a->family == AF_INET)
return (a->ip4.in_addr.s_addr == b->ip4.in_addr.s_addr);
else if (a->family == AF_INET6)
return a->ip6.uint64[0] == b->ip6.uint64[0] && a->ip6.uint64[1] == b->ip6.uint64[1];
else
return 0;
}
/* different family: check on the IPv6 one if it is the IPv4 one embedded */
if ((a->family == AF_INET) && (b->family == AF_INET6)) {
if (IPV6_IPV4_IN_V6(b->ip6))
return (a->ip4.in_addr.s_addr == b->ip6.uint32[3]);
} else if ((a->family == AF_INET6) && (b->family == AF_INET)) {
if (IPV6_IPV4_IN_V6(a->ip6))
return (a->ip6.uint32[3] == b->ip4.in_addr.s_addr);
}
return 0;
}
/* ipport_equal
* compares two IPAny_Port structures
* unset means unequal
*
* returns 0 when not equal or when uninitialized
*/
int ipport_equal(const IP_Port *a, const IP_Port *b)
{
if (!a || !b)
return 0;
if (!a->port || (a->port != b->port))
return 0;
return ip_equal(&a->ip, &b->ip);
}
/* nulls out ip */
void ip_reset(IP *ip)
{
if (!ip)
return;
memset(ip, 0, sizeof(IP));
}
/* nulls out ip, sets family according to flag */
void ip_init(IP *ip, uint8_t ipv6enabled)
{
if (!ip)
return;
memset(ip, 0, sizeof(IP));
ip->family = ipv6enabled ? AF_INET6 : AF_INET;
}
/* checks if ip is valid */
int ip_isset(const IP *ip)
{
if (!ip)
return 0;
return (ip->family != 0);
}
/* checks if ip is valid */
int ipport_isset(const IP_Port *ipport)
{
if (!ipport)
return 0;
if (!ipport->port)
return 0;
return ip_isset(&ipport->ip);
}
/* copies an ip structure (careful about direction!) */
void ip_copy(IP *target, const IP *source)
{
if (!source || !target)
return;
memcpy(target, source, sizeof(IP));
}
/* copies an ip_port structure (careful about direction!) */
void ipport_copy(IP_Port *target, const IP_Port *source)
{
if (!source || !target)
return;
memcpy(target, source, sizeof(IP_Port));
};
/* ip_ntoa
* converts ip into a string
* uses a static buffer, so mustn't used multiple times in the same output
*
* IPv6 addresses are enclosed into square brackets, i.e. "[IPv6]"
* writes error message into the buffer on error
*/
/* there would be INET6_ADDRSTRLEN, but it might be too short for the error message */
static char addresstext[96];
const char *ip_ntoa(const IP *ip)
{
if (ip) {
if (ip->family == AF_INET) {
/* returns standard quad-dotted notation */
struct in_addr *addr = (struct in_addr *)&ip->ip4;
addresstext[0] = 0;
inet_ntop(ip->family, addr, addresstext, sizeof(addresstext));
} else if (ip->family == AF_INET6) {
/* returns hex-groups enclosed into square brackets */
struct in6_addr *addr = (struct in6_addr *)&ip->ip6;
addresstext[0] = '[';
inet_ntop(ip->family, addr, &addresstext[1], sizeof(addresstext) - 3);
size_t len = strlen(addresstext);
addresstext[len] = ']';
addresstext[len + 1] = 0;
} else
snprintf(addresstext, sizeof(addresstext), "(IP invalid, family %u)", ip->family);
} else
snprintf(addresstext, sizeof(addresstext), "(IP invalid: NULL)");
/* brute force protection against lacking termination */
addresstext[sizeof(addresstext) - 1] = 0;
return addresstext;
}
/*
* ip_parse_addr
* parses IP structure into an address string
*
* input
* ip: ip of AF_INET or AF_INET6 families
* length: length of the address buffer
* Must be at least INET_ADDRSTRLEN for AF_INET
* and INET6_ADDRSTRLEN for AF_INET6
*
* output
* address: dotted notation (IPv4: quad, IPv6: 16) or colon notation (IPv6)
*
* returns 1 on success, 0 on failure
*/
int ip_parse_addr(const IP *ip, char *address, size_t length)
{
if (!address || !ip) {
return 0;
}
if (ip->family == AF_INET) {
struct in_addr *addr = (struct in_addr *)&ip->ip4;
return inet_ntop(ip->family, addr, address, length) != NULL;
} else if (ip->family == AF_INET6) {
struct in6_addr *addr = (struct in6_addr *)&ip->ip6;
return inet_ntop(ip->family, addr, address, length) != NULL;
}
return 0;
}
/*
* addr_parse_ip
* directly parses the input into an IP structure
* tries IPv4 first, then IPv6
*
* input
* address: dotted notation (IPv4: quad, IPv6: 16) or colon notation (IPv6)
*
* output
* IP: family and the value is set on success
*
* returns 1 on success, 0 on failure
*/
int addr_parse_ip(const char *address, IP *to)
{
if (!address || !to)
return 0;
struct in_addr addr4;
if (1 == inet_pton(AF_INET, address, &addr4)) {
to->family = AF_INET;
to->ip4.in_addr = addr4;
return 1;
}
struct in6_addr addr6;
if (1 == inet_pton(AF_INET6, address, &addr6)) {
to->family = AF_INET6;
to->ip6.in6_addr = addr6;
return 1;
}
return 0;
}
/*
* addr_resolve():
* uses getaddrinfo to resolve an address into an IP address
* uses the first IPv4/IPv6 addresses returned by getaddrinfo
*
* input
* address: a hostname (or something parseable to an IP address)
* to: to.family MUST be initialized, either set to a specific IP version
* (AF_INET/AF_INET6) or to the unspecified AF_UNSPEC (= 0), if both
* IP versions are acceptable
* 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 AF_UNSPEC and both available
* returns in *extra an IPv4 address, if family was AF_UNSPEC and *to is AF_INET6
* returns 0 on failure
*/
int addr_resolve(const char *address, IP *to, IP *extra)
{
if (!address || !to)
return 0;
sa_family_t family = to->family;
struct addrinfo *server = NULL;
struct addrinfo *walker = NULL;
struct addrinfo hints;
int rc;
memset(&hints, 0, sizeof(hints));
hints.ai_family = family;
hints.ai_socktype = SOCK_DGRAM; // type of socket Tox uses.
if (networking_at_startup() != 0)
return 0;
rc = getaddrinfo(address, NULL, &hints, &server);
// Lookup failed.
if (rc != 0) {
return 0;
}
IP4 ip4;
memset(&ip4, 0, sizeof(ip4));
IP6 ip6;
memset(&ip6, 0, sizeof(ip6));
for (walker = server; (walker != NULL) && (rc != 3); walker = walker->ai_next) {
switch (walker->ai_family) {
case AF_INET:
if (walker->ai_family == family) { /* AF_INET requested, done */
struct sockaddr_in *addr = (struct sockaddr_in *)walker->ai_addr;
to->ip4.in_addr = addr->sin_addr;
rc = 3;
} else if (!(rc & 1)) { /* AF_UNSPEC requested, store away */
struct sockaddr_in *addr = (struct sockaddr_in *)walker->ai_addr;
ip4.in_addr = addr->sin_addr;
rc |= 1;
}
break; /* switch */
case AF_INET6:
if (walker->ai_family == family) { /* AF_INET6 requested, done */
if (walker->ai_addrlen == sizeof(struct sockaddr_in6)) {
struct sockaddr_in6 *addr = (struct sockaddr_in6 *)walker->ai_addr;
to->ip6.in6_addr = addr->sin6_addr;
rc = 3;
}
} else if (!(rc & 2)) { /* AF_UNSPEC requested, store away */
if (walker->ai_addrlen == sizeof(struct sockaddr_in6)) {
struct sockaddr_in6 *addr = (struct sockaddr_in6 *)walker->ai_addr;
ip6.in6_addr = addr->sin6_addr;
rc |= 2;
}
}
break; /* switch */
}
}
if (to->family == AF_UNSPEC) {
if (rc & 2) {
to->family = AF_INET6;
to->ip6 = ip6;
if ((rc & 1) && (extra != NULL)) {
extra->family = AF_INET;
extra->ip4 = ip4;
}
} else if (rc & 1) {
to->family = AF_INET;
to->ip4 = ip4;
} else
rc = 0;
}
freeaddrinfo(server);
return rc;
}
/*
* addr_resolve_or_parse_ip
* resolves string into an IP address
*
* address: a hostname (or something parseable to an IP address)
* to: to.family MUST be initialized, either set to a specific IP version
* (AF_INET/AF_INET6) or to the unspecified AF_UNSPEC (= 0), if both
* IP versions are acceptable
* 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 AF_UNSPEC
* returns 1 on success
* returns 0 on failure
*/
int addr_resolve_or_parse_ip(const char *address, IP *to, IP *extra)
{
if (!addr_resolve(address, to, extra))
if (!addr_parse_ip(address, to))
return 0;
return 1;
}
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