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quakeforge/libs/net/nc/net_udp6.c
Bill Currie 12c84046f3 [cvar] Make cvars properly typed 
This is an extremely extensive patch as it hits every cvar, and every
usage of the cvars. Cvars no longer store the value they control,
instead, they use a cexpr value object to reference the value and
specify the value's type (currently, a null type is used for strings).
Non-string cvars are passed through cexpr, allowing expressions in the
cvars' settings. Also, cvars have returned to an enhanced version of the
original (id quake) registration scheme.

As a minor benefit, relevant code having direct access to the
cvar-controlled variables is probably a slight optimization as it
removed a pointer dereference, and the variables can be located for data
locality.

The static cvar descriptors are made private as an additional safety
layer, though there's nothing stopping external modification via
Cvar_FindVar (which is needed for adding listeners).

While not used yet (partly due to working out the design), cvars can
have a validation function.

Registering a cvar allows a primary listener (and its data) to be
specified: it will always be called first when the cvar is modified. The
combination of proper listeners and direct access to the controlled
variable greatly simplifies the more complex cvar interactions as much
less null checking is required, and there's no need for one cvar's
callback to call another's.

nq-x11 is known to work at least well enough for the demos. More testing
will come.
2022-04-24 19:15:22 +09:00

618 lines
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C
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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 char *net_family;
static cvar_t net_family_cvar = {
.name = "net_family",
.description =
"Set the address family to ipv4, ipv6 or unspecified",
.default_value = "unspecified",
.flags = CVAR_ROM,
.value = { .type = 0, .value = &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, '6')) {
hints.ai_family = AF_INET6;
} else if (strchr (net_family, '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, '6')) {
hints.ai_family = AF_INET6;
} else if (strchr (net_family, '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 */
Cvar_Register (&net_family_cvar, 0, 0);
// 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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