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quakeforge/libs/net/nc/net_udp6.c
Bill Currie 4e4d1b99b4 Clean up all the system shutdown calls 
I added Sys_RegisterShutdown years ago and never really did anything
with it: now any system that needs to be shutdown can ensure it gets
shutdown on program exit, and in the correct order (ie, reverse to init
order).
2019-07-12 23:15:26 +09:00

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/*
net_udp6.c
(description)
Copyright (C) 1996-1997 Id Software, Inc.
Copyright (C) 2000 Marcus Sundberg [mackan@stacken.kth.se]
Copyright (C) 1999,2000 contributors of the QuakeForge project
Please see the file "AUTHORS" for a list of contributors
This program 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 2
of the License, or (at your option) any later version.
This program 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 this program; if not, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
/* Sun's model_t in sys/model.h conflicts w/ Quake's model_t */
#define model_t quakeforgemodel_t
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
# include <sys/ioctl.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#ifdef HAVE_NETDB_H
# include <netdb.h>
#endif
#ifdef HAVE_ARPA_INET_H
# include <arpa/inet.h>
#endif
#ifdef HAVE_SYS_FILIO_H
# include <sys/filio.h>
#endif
#ifdef NeXT
# include <libc.h>
#endif
#ifdef _WIN32
# include <windows.h>
# undef EWOULDBLOCK
# define EWOULDBLOCK WSAEWOULDBLOCK
# ifdef HAVE_IPV6
# include <winsock2.h>
# undef IP_MULTICAST_IF
# undef IP_MULTICAST_TTL
# undef IP_MULTICAST_LOOP
# undef IP_ADD_MEMBERSHIP
# undef IP_DROP_MEMBERSHIP
# define ip_mreq ip_mreq_icky_hack
# include <ws2tcpip.h>
# undef ip_mreq
# ifndef WINSOCK_API_LINKAGE
# define WINSOCK_API_LINKAGE
# endif
# ifndef _WINSOCK2API_
# define _WINSOCK2API_
# endif
# define _WINSOCKAPI_
# define HAVE_SOCKLEN_T
# endif
#endif
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#undef model_t
#include "QF/dstring.h"
#include "QF/msg.h"
#include "QF/qargs.h"
#include "QF/sys.h"
#include "netchan.h"
#ifndef MAXHOSTNAMELEN
# define MAXHOSTNAMELEN 512
#endif
#if defined(__GLIBC__) && !defined(s6_addr32) // glibc macro
# define s6_addr32 in6_u.u6_addr32
# if ! __GLIBC_PREREQ (2,2)
# define ss_family __ss_family
# endif
#endif
static cvar_t *net_family;
netadr_t net_from;
netadr_t net_local_adr;
netadr_t net_loopback_adr;
int net_socket;
static sizebuf_t _net_message_message;
static qmsg_t _net_message = {0, 0, &_net_message_message};
qmsg_t *net_message = &_net_message;
#define MAX_UDP_PACKET (MAX_MSGLEN*2)
byte net_message_buffer[MAX_UDP_PACKET];
#ifdef _WIN32
WSADATA winsockdata;
#endif
typedef union address {
struct sockaddr_storage ss;
struct sockaddr sa;
struct sockaddr_in s4;
struct sockaddr_in6 s6;
} AF_address_t;
#undef SA_LEN
#undef SS_LEN
#ifdef HAVE_SA_LEN
#define SA_LEN(sa) (sa)->sa_len
#else
#define SA_LEN(sa) (((sa)->sa_family == AF_INET6) \
? sizeof(struct sockaddr_in6) \
: sizeof(struct sockaddr_in))
#endif
#ifdef HAVE_SS_LEN
#define SS_LEN(ss) (ss)->ss_len
#else
#define SS_LEN(ss) (((ss)->ss_family == AF_INET6) \
? sizeof(struct sockaddr_in6) \
: sizeof(struct sockaddr_in))
#endif
static void
NetadrToSockadr (netadr_t *a, AF_address_t *s)
{
memset (s, 0, sizeof (*s));
switch (a->family) {
case AF_INET: {
Sys_MaskPrintf (SYS_NET, "err, converting v4 to v6...\n");
s->ss.ss_family = AF_INET6;
s->s6.sin6_addr.s6_addr[10] = s->s6.sin6_addr.s6_addr[11] = 0xff;
memcpy (&s->s6.sin6_addr.s6_addr[12], &a->ip, sizeof (s->s4.sin_addr));
s->s4.sin_port = a->port;
#ifdef HAVE_SS_LEN
s->ss.ss_len = sizeof (struct sockaddr_in6);
#endif
break;
}
case AF_INET6: {
s->ss.ss_family = a->family;
memcpy (&s->s6.sin6_addr, &a->ip, sizeof (s->s6.sin6_addr));
s->s6.sin6_port = a->port;
#ifdef HAVE_SS_LEN
s->ss.ss_len = sizeof (struct sockaddr_in6);
#endif
break;
}
default:
Sys_MaskPrintf (SYS_NET, "%s: Unknown address family %d", __FUNCTION__, a->family);
break;
}
}
static void
SockadrToNetadr (AF_address_t *s, netadr_t *a)
{
a->family = s->ss.ss_family;
switch (a->family) {
case AF_INET: {
memcpy (a->ip, &(s->s4.sin_addr), sizeof (s->s4.sin_addr));
a->port = s->s4.sin_port;
break;
}
case AF_INET6: {
memcpy (a->ip, &(s->s6.sin6_addr), sizeof (s->s6.sin6_addr));
a->port = s->s6.sin6_port;
break;
}
default:
Sys_MaskPrintf (SYS_NET, "%s: Unknown address family 0x%x\n", __FUNCTION__, s->ss.ss_family);
break;
}
}
/*
static qboolean
NET_AdrIsLoopback (netadr_t a)
{
if (IN6_IS_ADDR_LOOPBACK ((struct in6_addr *) &a.ip))
return true;
else if (IN6_IS_ADDR_V4MAPPED ((struct in6_addr *) &a.ip) &&
((struct in_addr *) &a.ip[3])->s_addr == htonl (INADDR_LOOPBACK))
return true;
return false;
}
*/
qboolean
NET_CompareBaseAdr (netadr_t a, netadr_t b)
{
if (memcmp (a.ip, b.ip, sizeof (a.ip)) == 0)
return true;
return false;
}
qboolean
NET_CompareAdr (netadr_t a, netadr_t b)
{
if (memcmp (a.ip, b.ip, sizeof (a.ip)) == 0 && a.port == b.port)
return true;
return false;
}
const char *
NET_AdrToString (netadr_t a)
{
static dstring_t *s;
char base[64];
AF_address_t ss;
/*
Yes, this duplication is lame, but we want to know the real address
family of the address so that we can know whether or not to put a
bracket around it, and this is less ugly than trying to check the
string returned from NET_BaseAdrToString()
*/
memset (&ss, 0, sizeof (ss));
NetadrToSockadr (&a, &ss);
// Convert any "mapped" addresses back to v4
if (a.family == AF_INET6 && IN6_IS_ADDR_V4MAPPED (&(ss.s6.sin6_addr))) {
#ifdef HAVE_SS_LEN
ss.ss.ss_len = sizeof (ss.s4);
#endif
ss.ss.ss_family = AF_INET;
memcpy (&(ss.s4.sin_addr), &ss.s6.sin6_addr.s6_addr[12], sizeof (ss.s4.sin_addr));
}
if (getnameinfo (&ss.sa, SS_LEN(&ss.ss), base, sizeof (base),
NULL, 0, NI_NUMERICHOST)) strcpy (base, "<invalid>");
if (!s)
s = dstring_new ();
if (ss.ss.ss_family == AF_INET6) {
dsprintf (s, "[%s]:%d", base, ntohs (a.port));
} else {
dsprintf (s, "%s:%d", base, ntohs (a.port));
}
return s->str;
}
const char *
NET_BaseAdrToString (netadr_t a)
{
static char s[64];
AF_address_t ss;
memset (&ss, 0, sizeof (ss));
NetadrToSockadr (&a, &ss);
// Convert any "mapped" addresses back to v4
if (a.family == AF_INET6 && IN6_IS_ADDR_V4MAPPED (&(ss.s6.sin6_addr))) {
#ifdef HAVE_SS_LEN
ss.ss.ss_len = sizeof (ss.s4);
#endif
ss.ss.ss_family = AF_INET;
memcpy (&(ss.s4.sin_addr), &ss.s6.sin6_addr.s6_addr[12],
sizeof (ss.s4.sin_addr));
}
if (getnameinfo (&ss.sa, SS_LEN(&ss.ss), s, sizeof (s),
NULL, 0, NI_NUMERICHOST)) strcpy (s, "<invalid>");
return s;
}
/*
NET_StringToAdr
idnewt
idnewt:28000
192.246.40.70
192.246.40.70:28000
*/
qboolean
NET_StringToAdr (const char *s, netadr_t *a)
{
static dstring_t *copy;
char *addrs, *space;
char *ports = NULL;
int err;
struct addrinfo hints;
struct addrinfo *resultp;
AF_address_t addr;
AF_address_t resadr;
if (!copy)
copy = dstring_new ();
memset (&hints, 0, sizeof (hints));
hints.ai_socktype = SOCK_DGRAM;
if (strchr (net_family->string, '6')) {
hints.ai_family = AF_INET6;
} else if (strchr (net_family->string, '4')) {
hints.ai_family = AF_INET;
} else {
hints.ai_family = AF_UNSPEC;
}
dstring_copystr (copy, s);
addrs = space = copy->str;
if (*addrs == '[') {
addrs++;
for (; *space && *space != ']'; space++);
if (!*space) {
Sys_Printf ("NET_StringToAdr: invalid IPv6 address %s\n", s);
return 0;
}
*space++ = '\0';
}
for (; *space; space++) {
if (*space == ':') {
*space = '\0';
ports = space + 1;
}
}
if ((err = getaddrinfo (addrs, ports, &hints, &resultp))) { // Error
Sys_Printf ("NET_StringToAdr: string %s:\n%s\n", s, gai_strerror (err));
return 0;
}
switch (resultp->ai_family) {
case AF_INET:
// convert to ipv6 addr
memset (&addr, 0, sizeof (addr));
memset (&resadr, 0, sizeof (resadr));
memcpy (&resadr.s4, resultp->ai_addr, sizeof (resadr.s4));
addr.ss.ss_family = AF_INET6;
addr.s6.sin6_addr.s6_addr[10] = addr.s6.sin6_addr.s6_addr[11] = 0xff;
memcpy (&(addr.s6.sin6_addr.s6_addr[12]), &resadr.s4.sin_addr,
sizeof (resadr.s4.sin_addr));
addr.s6.sin6_port = resadr.s4.sin_port;
break;
case AF_INET6:
memcpy (&addr, resultp->ai_addr, sizeof (addr.s6));
break;
default:
Sys_Printf ("NET_StringToAdr: string %s:\nprotocol family %d not "
"supported\n", s, resultp->ai_family);
return 0;
}
freeaddrinfo (resultp);
SockadrToNetadr (&addr, a);
Sys_MaskPrintf (SYS_NET, "Raw address: %s\n", NET_BaseAdrToString (*a));
return true;
}
qboolean
NET_GetPacket (void)
{
int ret;
unsigned int fromlen;
AF_address_t from;
fromlen = sizeof (from);
memset (&from, 0, sizeof (from));
ret = recvfrom (net_socket, (void *) net_message_buffer,
sizeof (net_message_buffer), 0, &from.sa, &fromlen);
if (ret == -1) {
#ifdef _WIN32
int err = WSAGetLastError ();
if (err == WSAEMSGSIZE) {
Sys_Printf ("Warning: Oversize packet from %s\n",
NET_AdrToString (net_from));
return false;
}
#else // _WIN32
int err = errno;
if (err == ECONNREFUSED)
return false;
#endif // _WIN32
if (err == EWOULDBLOCK)
return false;
Sys_Printf ("NET_GetPacket: %s\n", strerror (err));
return false;
}
SockadrToNetadr (&from, &net_from);
_net_message_message.cursize = ret;
if (ret == sizeof (net_message_buffer)) {
Sys_Printf ("Oversize packet from %s\n", NET_AdrToString (net_from));
return false;
}
return ret;
}
void
NET_SendPacket (int length, const void *data, netadr_t to)
{
int ret;
AF_address_t addr;
NetadrToSockadr (&to, &addr);
ret = sendto (net_socket, data, length, 0, &addr.sa, SA_LEN (&addr.sa));
if (ret == -1) {
#ifdef _WIN32
int err = WSAGetLastError ();
if (err == WSAEADDRNOTAVAIL)
Sys_Printf ("NET_SendPacket Warning: %i\n", err);
#else /* _WIN32 */
int err = errno;
if (err == ECONNREFUSED)
return;
#endif /* _WIN32 */
if (err == EWOULDBLOCK)
return;
Sys_Printf ("NET_SendPacket: %s\n", strerror (err));
}
}
static int
UDP_OpenSocket (int port)
{
char Buf[BUFSIZ];
const char *Host, *Service;
int newsocket, Error;
struct sockaddr_in6 address;
struct addrinfo hints, *res;
#ifdef IPV6_V6ONLY
int off = 0;
#endif
#ifdef _WIN32
#define ioctl ioctlsocket
unsigned long _true = true;
#else
int _true = 1;
#endif
int i;
if ((newsocket = socket (PF_INET6, SOCK_DGRAM, IPPROTO_UDP)) == -1)
Sys_Error ("UDP_OpenSocket: socket: %s", strerror (errno));
if (ioctl (newsocket, FIONBIO, &_true) == -1)
Sys_Error ("UDP_OpenSocket: ioctl FIONBIO: %s", strerror (errno));
memset (&address, 0, sizeof (address));
address.sin6_family = AF_INET6;
memset (&hints, 0, sizeof (hints));
if (strchr (net_family->string, '6')) {
hints.ai_family = AF_INET6;
} else if (strchr (net_family->string, '4')) {
hints.ai_family = AF_INET;
} else {
hints.ai_family = AF_UNSPEC;
}
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;
hints.ai_flags = AI_PASSIVE;
// ZOID -- check for interface binding option
if ((i = COM_CheckParm ("-ip")) && i < com_argc) {
Host = com_argv[i + 1];
} else {
Host = "::0";
}
Sys_MaskPrintf (SYS_NET, "Binding to IP address [%s]\n", Host);
if (port == PORT_ANY)
Service = NULL;
else {
sprintf (Buf, "%5d", port);
Service = Buf;
}
if ((Error = getaddrinfo (Host, Service, &hints, &res)))
Sys_Error ("UDP_OpenSocket: getaddrinfo: %s", gai_strerror (Error));
if ((newsocket = socket (res->ai_family,
res->ai_socktype,
res->ai_protocol)) == -1)
Sys_Error ("UDP_OpenSocket: socket: %s", strerror (errno));
// FIONBIO sets non-blocking IO for this socket
#ifdef _WIN32
if (ioctl (newsocket, FIONBIO, &_true) == -1)
#else /* _WIN32 */
if (ioctl (newsocket, FIONBIO, (char *) &_true) == -1)
#endif /* _WIN32 */
Sys_Error ("UDP_OpenSocket: ioctl FIONBIO: %s", strerror (errno));
// don't care about the result code
#ifdef IPV6_V6ONLY
setsockopt (newsocket, IPPROTO_IPV6, IPV6_V6ONLY, &off, sizeof (off));
#endif
if (bind (newsocket, res->ai_addr, res->ai_addrlen) < 0)
Sys_Error ("UDP_OpenSocket: bind: %s", strerror (errno));
freeaddrinfo (res);
return newsocket;
}
static void
NET_GetLocalAddress (void)
{
char buff[MAXHOSTNAMELEN];
socklen_t namelen;
AF_address_t address;
if (gethostname (buff, MAXHOSTNAMELEN) == -1)
Sys_Error ("Net_GetLocalAddress: gethostname: %s", strerror (errno));
buff[MAXHOSTNAMELEN - 1] = 0;
NET_StringToAdr (buff, &net_local_adr);
namelen = sizeof (address);
if (getsockname (net_socket, (struct sockaddr *) &address, &namelen) == -1)
Sys_Error ("NET_GetLocalAddress: getsockname: %s", strerror (errno));
net_local_adr.port = address.s6.sin6_port;
Sys_Printf ("IP address %s\n", NET_AdrToString (net_local_adr));
}
void
NET_Init (int port)
{
#ifdef _WIN32
int r;
WORD wVersionRequested;
wVersionRequested = MAKEWORD (1, 1);
r = WSAStartup (MAKEWORD (1, 1), &winsockdata);
if (r)
Sys_Error ("Winsock initialization failed.");
#endif /* _WIN32 */
net_family = Cvar_Get ("net_family", "unspecified", CVAR_ROM, 0,
"Set the address family to ipv4, ipv6 or"
" unspecified");
// open the single socket to be used for all communications
net_socket = UDP_OpenSocket (port);
// init the message buffer
_net_message_message.maxsize = sizeof (net_message_buffer);
_net_message_message.data = net_message_buffer;
// determine my name & address
NET_GetLocalAddress ();
net_loopback_adr.ip[15] = 1;
Sys_Printf ("UDP (IPv6) Initialized\n");
}
static void
NET_shutdown (void)
{
#ifdef _WIN32
closesocket (net_socket);
WSACleanup ();
#else
close (net_socket);
#endif
}
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