// net_udp.c

#include "quakedef.h"

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <errno.h>

#ifdef NeXT
#include <libc.h>
#endif

extern int gethostname(char *, int);
extern int close(int);

extern cvar_t hostname;

#define	DEFAULTnet_hostport	26000

static int net_acceptsocket = -1;	// socket for fielding new connections
static int net_controlsocket;
static int net_hostport;	// udp port number for acceptsocket
static int net_broadcastsocket = 0;
static struct qsockaddr broadcastaddr;

static unsigned long myAddr;

#include "net_udp.h"

//=============================================================================

int UDP_Init(void)
{
    int p;
    struct hostent *local;
    char buff[MAXHOSTNAMELEN];
    struct qsockaddr addr;
    char *colon;

    if (COM_CheckParm("-noudp"))
	return -1;

    p = COM_CheckParm("-udpport");
    if (p == 0)
	net_hostport = DEFAULTnet_hostport;
    else if (p < com_argc - 1)
	net_hostport = Q_atoi(com_argv[p + 1]);
    else
	Sys_Error("UDP_Init: you must specify a number after -udpport");

    // determine my name & address
    gethostname(buff, MAXHOSTNAMELEN);
    local = gethostbyname(buff);
    myAddr = *(int *) local->h_addr_list[0];

    // if the quake hostname isn't set, set it to the machine name
    if (Q_strcmp(hostname.string, "UNNAMED") == 0) {
	buff[15] = 0;
	Cvar_Set("hostname", buff);
    }

    if ((net_controlsocket = UDP_OpenSocket(0)) == -1)
	Sys_Error("UDP_Init: Unable to open control socket\n");

    ((struct sockaddr_in *) &broadcastaddr)->sin_family = AF_INET;
    ((struct sockaddr_in *) &broadcastaddr)->sin_addr.s_addr =
	INADDR_BROADCAST;
    ((struct sockaddr_in *) &broadcastaddr)->sin_port =
	htons(net_hostport);

    UDP_GetSocketAddr(net_controlsocket, &addr);
    Q_strcpy(my_tcpip_address, UDP_AddrToString(&addr));
    colon = Q_strrchr(my_tcpip_address, ':');
    if (colon)
	*colon = 0;

    Con_Printf("UDP Initialized\n");
    tcpipAvailable = true;

    return net_controlsocket;
}

//=============================================================================

void UDP_Shutdown(void)
{
    UDP_Listen(false);
    UDP_CloseSocket(net_controlsocket);
}

//=============================================================================

void UDP_Listen(qboolean state)
{
    // enable listening
    if (state) {
	if (net_acceptsocket != -1)
	    return;
	if ((net_acceptsocket = UDP_OpenSocket(net_hostport)) == -1)
	    Sys_Error("UDP_Listen: Unable to open accept socket\n");
	return;
    }
    // disable listening
    if (net_acceptsocket == -1)
	return;
    UDP_CloseSocket(net_acceptsocket);
    net_acceptsocket = -1;
}

//=============================================================================

int UDP_OpenSocket(int port)
{
    int newsocket;
    struct sockaddr_in address;
    qboolean _true = true;

    if ((newsocket = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
	return -1;

    if (ioctl(newsocket, FIONBIO, (char *) &_true) == -1)
	goto ErrorReturn;

    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(port);
    if (bind(newsocket, (void *) &address, sizeof(address)) == -1)
	goto ErrorReturn;

    return newsocket;

  ErrorReturn:
    close(newsocket);
    return -1;
}

//=============================================================================

int UDP_CloseSocket(int socket)
{
    if (socket == net_broadcastsocket)
	net_broadcastsocket = 0;
    return close(socket);
}


//=============================================================================
/*
============
PartialIPAddress

this lets you type only as much of the net address as required, using
the local network components to fill in the rest
============
*/
static int PartialIPAddress(char *in, struct qsockaddr *hostaddr)
{
    char buff[256];
    char *b;
    int addr;
    int num;
    int mask;

    buff[0] = '.';
    b = buff;
    strcpy(buff + 1, in);
    if (buff[1] == '.')
	b++;

    addr = 0;
    mask = -1;
    while (*b == '.') {
	num = 0;
	if (*++b < '0' || *b > '9')
	    return -1;
	while (!(*b < '0' || *b > '9'))
	    num = num * 10 + *(b++) - '0';
	mask <<= 8;
	addr = (addr << 8) + num;
    }

    hostaddr->sa_family = AF_INET;
    ((struct sockaddr_in *) hostaddr)->sin_port = htons(net_hostport);
    ((struct sockaddr_in *) hostaddr)->sin_addr.s_addr =
	(myAddr & htonl(mask)) | htonl(addr);

    return 0;
}

//=============================================================================

int UDP_Connect(int socket, struct qsockaddr *addr)
{
    return 0;
}

//=============================================================================

int UDP_CheckNewConnections(void)
{
    char buf[4];

    if (net_acceptsocket == -1)
	return -1;

    if (recvfrom(net_acceptsocket, buf, 4, MSG_PEEK, NULL, NULL) > 0)
	return net_acceptsocket;
    return -1;
}

//=============================================================================

int UDP_Read(int socket, byte * buf, int len, struct qsockaddr *addr)
{
    int addrlen = sizeof(struct qsockaddr);
    int ret;

    ret =
	recvfrom(socket, buf, len, 0, (struct sockaddr *) addr, &addrlen);
    if (ret == -1 && (errno == EWOULDBLOCK || errno == ECONNREFUSED))
	return 0;
    return ret;
}

//=============================================================================

int UDP_MakeSocketBroadcastCapable(int socket)
{
    int i = 1;

    // make this socket broadcast capable
    if (setsockopt(socket, SOL_SOCKET, SO_BROADCAST, &i, sizeof(i)) < 0)
	return -1;
    net_broadcastsocket = socket;

    return 0;
}

//=============================================================================

int UDP_Broadcast(int socket, byte * buf, int len)
{
    int ret;

    if (socket != net_broadcastsocket) {
	if (net_broadcastsocket != 0)
	    Sys_Error("Attempted to use multiple broadcasts sockets\n");
	ret = UDP_MakeSocketBroadcastCapable(socket);
	if (ret == -1) {
	    Con_Printf("Unable to make socket broadcast capable\n");
	    return ret;
	}
    }

    return UDP_Write(socket, buf, len, &broadcastaddr);
}

//=============================================================================

int UDP_Write(int socket, byte * buf, int len, struct qsockaddr *addr)
{
    int ret;

    ret =
	sendto(socket, buf, len, 0, (struct sockaddr *) addr,
	       sizeof(struct qsockaddr));
    if (ret == -1 && errno == EWOULDBLOCK)
	return 0;
    return ret;
}

//=============================================================================

char *UDP_AddrToString(struct qsockaddr *addr)
{
    static char buffer[22];
    int haddr;

    haddr = ntohl(((struct sockaddr_in *) addr)->sin_addr.s_addr);
    sprintf(buffer, "%d.%d.%d.%d:%d", (haddr >> 24) & 0xff,
	    (haddr >> 16) & 0xff, (haddr >> 8) & 0xff, haddr & 0xff,
	    ntohs(((struct sockaddr_in *) addr)->sin_port));
    return buffer;
}

//=============================================================================

int UDP_StringToAddr(char *string, struct qsockaddr *addr)
{
    int ha1, ha2, ha3, ha4, hp;
    int ipaddr;

    sscanf(string, "%d.%d.%d.%d:%d", &ha1, &ha2, &ha3, &ha4, &hp);
    ipaddr = (ha1 << 24) | (ha2 << 16) | (ha3 << 8) | ha4;

    addr->sa_family = AF_INET;
    ((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(ipaddr);
    ((struct sockaddr_in *) addr)->sin_port = htons(hp);
    return 0;
}

//=============================================================================

int UDP_GetSocketAddr(int socket, struct qsockaddr *addr)
{
    int addrlen = sizeof(struct qsockaddr);
    unsigned int a;

    Q_memset(addr, 0, sizeof(struct qsockaddr));
    getsockname(socket, (struct sockaddr *) addr, &addrlen);
    a = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
    if (a == 0 || a == inet_addr("127.0.0.1"))
	((struct sockaddr_in *) addr)->sin_addr.s_addr = myAddr;

    return 0;
}

//=============================================================================

int UDP_GetNameFromAddr(struct qsockaddr *addr, char *name)
{
    struct hostent *hostentry;

    hostentry =
	gethostbyaddr((char *) &((struct sockaddr_in *) addr)->sin_addr,
		      sizeof(struct in_addr), AF_INET);
    if (hostentry) {
	Q_strncpy(name, (char *) hostentry->h_name, NET_NAMELEN - 1);
	return 0;
    }

    Q_strcpy(name, UDP_AddrToString(addr));
    return 0;
}

//=============================================================================

int UDP_GetAddrFromName(char *name, struct qsockaddr *addr)
{
    struct hostent *hostentry;

    if (name[0] >= '0' && name[0] <= '9')
	return PartialIPAddress(name, addr);

    hostentry = gethostbyname(name);
    if (!hostentry)
	return -1;

    addr->sa_family = AF_INET;
    ((struct sockaddr_in *) addr)->sin_port = htons(net_hostport);
    ((struct sockaddr_in *) addr)->sin_addr.s_addr =
	*(int *) hostentry->h_addr_list[0];

    return 0;
}

//=============================================================================

int UDP_AddrCompare(struct qsockaddr *addr1, struct qsockaddr *addr2)
{
    if ((addr1->sa_family & 0xff) != (addr2->sa_family & 0xff))
	return -1;

    if (((struct sockaddr_in *) addr1)->sin_addr.s_addr !=
	((struct sockaddr_in *) addr2)->sin_addr.s_addr)
	return -1;

    if (((struct sockaddr_in *) addr1)->sin_port !=
	((struct sockaddr_in *) addr2)->sin_port)
	return 1;

    return 0;
}

//=============================================================================

int UDP_GetSocketPort(struct qsockaddr *addr)
{
    return ntohs(((struct sockaddr_in *) addr)->sin_port);
}


int UDP_SetSocketPort(struct qsockaddr *addr, int port)
{
    ((struct sockaddr_in *) addr)->sin_port = htons(port);
    return 0;
}

//=============================================================================