ps2ipc.c

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/*
# _____     ___ ____     ___ ____
#  ____|   |    ____|   |        | |____|
# |     ___|   |____ ___|    ____| |    \    PS2DEV Open Source Project.
#-----------------------------------------------------------------------
# Copyright 2001-2004, ps2dev - http://www.ps2dev.org
# Licenced under Academic Free License version 2.0
# Review ps2sdk README & LICENSE files for further details.
*/
 
#include <tamtypes.h>
#include <string.h>
#include <kernel.h>
#include <sifrpc.h>
#include <iopcontrol.h>
 
#include <ps2ips.h>
#include <ps2ip_rpc.h>
 
static int lock_sema = -1;
static SifRpcClientData_t _ps2ip;
static struct {
    union {
        s32 result;
        s32 s;          //Generic socket parameter.
        cmd_pkt cmd_pkt;    //Generic command packet, used by multiple functions.
        listen_pkt listen_pkt;
        s_recv_pkt s_recv_pkt;
        r_recv_pkt r_recv_pkt;
        send_pkt send_pkt;
        socket_pkt socket_pkt;
        t_ip_info ip_info;
        char netif_name[8];
        select_pkt select_pkt;
        ioctl_pkt ioctl_pkt;
        getsockopt_pkt getsockopt_pkt;
        getsockopt_res_pkt getsockopt_res_pkt;
        setsockopt_pkt setsockopt_pkt;
        char hostname[256];
        gethostbyname_res_pkt gethostbyname_res_pkt;
        dns_setserver_pkt dns_setserver_pkt;
        dns_getserver_res_pkt dns_getserver_res_pkt;
        u8 numdns;
        u8 buffer[512];
    };
} _rpc_buffer __attribute__((aligned(64)));
static int _intr_data[32] __attribute__((aligned(64)));
 
static ip_addr_t dns_servers[DNS_MAX_SERVERS];
 
//Copied from LWIP, to be independent of the full LWIP source.
/* used by IP4_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */
const ip_addr_t ip_addr_any = IPADDR4_INIT(IPADDR_ANY);
 
/* The following are defined in ps2ipc_ps2sdk.c */
extern void _ps2sdk_ps2ipc_init(void);
extern void _ps2sdk_ps2ipc_deinit(void);
 
int ps2ip_init(void)
{
    ee_sema_t sema;
    if (HasIopRebootedSinceLastCall())
        ps2ip_deinit();
 
    if (_ps2ip.server)
        return 0;
 
    while(1)
    {
        if(sceSifBindRpc(&_ps2ip, PS2IP_IRX, 0) < 0)
            return -1;
 
        if(_ps2ip.server != NULL)
            break;
 
        nopdelay();
    }
 
    sema.init_count = 1;
    sema.max_count = 1;
    sema.option = (u32)"ps2ipc";
    sema.attr = 0;
    lock_sema = CreateSema(&sema);
 
    _ps2sdk_ps2ipc_init();
 
    return 0;
}
 
void ps2ip_deinit(void)
{
    _ps2sdk_ps2ipc_deinit();
 
    if (lock_sema >= 0)
        DeleteSema(lock_sema);
    lock_sema = -1;
 
    memset(&_ps2ip, 0, sizeof(_ps2ip));
}
 
int ps2ipc_accept(int s, struct sockaddr *addr, int *addrlen)
{
    int result;
    cmd_pkt *pkt = &_rpc_buffer.cmd_pkt;
 
    if(!_ps2ip.server) return -1;
 
    WaitSema(lock_sema);
 
    pkt->socket = s;
 
    if (sceSifCallRpc(&_ps2ip, PS2IPS_ID_ACCEPT, 0, (void*)pkt, sizeof(s32), (void*)pkt, sizeof(cmd_pkt), NULL, NULL) < 0)
    {
        SignalSema(lock_sema);
        return -1;
    }
 
    if(addr != NULL)
    {
        if(pkt->len < *addrlen) *addrlen = pkt->len;
        memcpy((void *)addr, (void *)&pkt->sockaddr, *addrlen);
    }
 
    result = pkt->socket;
 
    SignalSema(lock_sema);
 
    return result;
}
 
int ps2ipc_bind(int s, const struct sockaddr *name, int namelen)
{
    cmd_pkt *pkt = &_rpc_buffer.cmd_pkt;
    int result;
 
    if(!_ps2ip.server) return -1;
 
    WaitSema(lock_sema);
 
    pkt->socket = s;
    pkt->len = namelen;
    memcpy((void *)&pkt->sockaddr, (void *)name, sizeof(struct sockaddr));
 
    if (sceSifCallRpc(&_ps2ip, PS2IPS_ID_BIND, 0, (void*)pkt, sizeof(cmd_pkt), (void*)&_rpc_buffer.result, sizeof(s32), NULL, NULL) < 0)
    {
        SignalSema(lock_sema);
        return -1;
    }
 
    result = _rpc_buffer.result;
 
    SignalSema(lock_sema);
 
    return result;
}
 
int ps2ipc_disconnect(int s)
{
    int result;
 
    if(!_ps2ip.server) return -1;
 
    WaitSema(lock_sema);
 
    _rpc_buffer.s = s;
 
    if (sceSifCallRpc(&_ps2ip, PS2IPS_ID_DISCONNECT, 0, (void*)&_rpc_buffer.s, sizeof(s32), (void*)&_rpc_buffer.result, sizeof(s32), NULL, NULL) < 0)
    {
        SignalSema(lock_sema);
        return -1;
    }
 
    result = _rpc_buffer.result;
 
    SignalSema(lock_sema);
 
    return result;
}
 
int ps2ipc_connect(int s, const struct sockaddr *name, int namelen)
{
    int result;
    cmd_pkt *pkt = &_rpc_buffer.cmd_pkt;
 
    if(!_ps2ip.server) return -1;
 
    WaitSema(lock_sema);
 
    pkt->socket = s;
    pkt->len = namelen;
    memcpy((void *)&pkt->sockaddr, (void *)name, sizeof(struct sockaddr));
 
    if (sceSifCallRpc(&_ps2ip, PS2IPS_ID_CONNECT, 0, (void*)pkt, sizeof(cmd_pkt), (void*)&_rpc_buffer.result, sizeof(s32), NULL, NULL) < 0)
    {
        SignalSema(lock_sema);
        return -1;
    }
 
    result = _rpc_buffer.result;
 
    SignalSema(lock_sema);
 
    return result;
}
 
int ps2ipc_listen(int s, int backlog)
{
    int result;
    listen_pkt *pkt = &_rpc_buffer.listen_pkt;
 
    if(!_ps2ip.server) return -1;
 
    WaitSema(lock_sema);
 
    pkt->s = s;
    pkt->backlog = backlog;
 
    if (sceSifCallRpc(&_ps2ip, PS2IPS_ID_LISTEN, 0, (void*)pkt, sizeof(listen_pkt), (void*)&_rpc_buffer.result, sizeof(s32), NULL, NULL) < 0)
    {
        SignalSema(lock_sema);
        return -1;
    }
 
    result = _rpc_buffer.result;
 
    SignalSema(lock_sema);
 
    return result;
}
 
static void recv_intr(void *data_raw)
{
    rests_pkt *rests = UNCACHED_SEG(data_raw);
    int i;
 
    if(rests->ssize)
        for(i = 0; i < rests->ssize; i++)
            rests->sbuf[i] = rests->sbuffer[i];
 
    if(rests->esize)
        for(i = 0; i < rests->esize; i++)
            rests->ebuf[i] = rests->ebuffer[i];
}
 
 
int ps2ipc_recv(int s, void *mem, int len, unsigned int flags)
{
    int result;
    s_recv_pkt *send_pkt = &_rpc_buffer.s_recv_pkt;
    r_recv_pkt *recv_pkt = &_rpc_buffer.r_recv_pkt;
 
    if(!_ps2ip.server) return -1;
 
    WaitSema(lock_sema);
 
    send_pkt->socket = s;
    send_pkt->length = len;
    send_pkt->flags = flags;
    send_pkt->ee_addr = mem;
    send_pkt->intr_data = _intr_data;
 
    if( !IS_UNCACHED_SEG(mem))
        sceSifWriteBackDCache(mem, len);
 
    if (sceSifCallRpc(&_ps2ip, PS2IPS_ID_RECV, 0, (void*)send_pkt, sizeof(s_recv_pkt),
                (void*)recv_pkt, sizeof(r_recv_pkt), recv_intr, _intr_data) < 0)
    {
        SignalSema(lock_sema);
        return -1;
    }
 
    result = recv_pkt->ret;
 
    SignalSema(lock_sema);
 
    return result;
}
 
int ps2ipc_recvfrom(int s, void *mem, int len, unsigned int flags,
          struct sockaddr *from, int *fromlen)
{
    int result;
    s_recv_pkt *send_pkt = &_rpc_buffer.s_recv_pkt;
    r_recv_pkt *recv_pkt = &_rpc_buffer.r_recv_pkt;
 
    if(!_ps2ip.server) return -1;
 
    WaitSema(lock_sema);
 
    send_pkt->socket = s;
    send_pkt->length = len;
    send_pkt->flags = flags;
    send_pkt->ee_addr = mem;
    send_pkt->intr_data = _intr_data;
 
    if( !IS_UNCACHED_SEG(mem))
        sceSifWriteBackDCache(mem, len);
 
    if (sceSifCallRpc(&_ps2ip, PS2IPS_ID_RECVFROM, 0, (void*)send_pkt, sizeof(s_recv_pkt),
                (void*)recv_pkt, sizeof(r_recv_pkt), recv_intr, _intr_data) < 0)
    {
        SignalSema(lock_sema);
        return -1;
    }
 
    memcpy((void *)from, (void *)&recv_pkt->sockaddr, sizeof(struct sockaddr));
    *fromlen = sizeof(struct sockaddr);
 
    result = recv_pkt->ret;
 
    SignalSema(lock_sema);
 
    return result;
}
 
int ps2ipc_send(int s, const void *dataptr, int size, unsigned int flags)
{
    int result;
    send_pkt *pkt = &_rpc_buffer.send_pkt;
    int miss;
 
    WaitSema(lock_sema);
 
    pkt->socket = s;
    pkt->length = size;
    pkt->flags = flags;
    pkt->ee_addr = (void *)dataptr;
 
    if((u32)dataptr & 0x3f)
    {
        miss = 64 - ((u32)dataptr & 0x3f);
        if(miss > size) miss = size;
 
    } else {
 
        miss = 0;
    }
 
    pkt->malign = miss;
 
    if( !IS_UNCACHED_SEG(dataptr))
        sceSifWriteBackDCache((void *)dataptr, size);
 
    memcpy((void *)pkt->malign_buff, UNCACHED_SEG(dataptr), miss);
 
    if (sceSifCallRpc(&_ps2ip, PS2IPS_ID_SEND, 0, (void*)pkt, sizeof(send_pkt),
                (void*)&_rpc_buffer.result, sizeof(s32), NULL, NULL) < 0)
    {
        SignalSema(lock_sema);
        return -1;
    }
 
    result = _rpc_buffer.result;
 
    SignalSema(lock_sema);
 
    return result;
}
 
int ps2ipc_sendto(int s, const void *dataptr, int size, unsigned int flags,
        const struct sockaddr *to, int tolen)
{
    int result;
    send_pkt *pkt = &_rpc_buffer.send_pkt;
    int miss;
 
    (void)tolen;
 
    WaitSema(lock_sema);
 
    pkt->socket = s;
    pkt->length = size;
    pkt->flags = flags;
    pkt->ee_addr = (void *)dataptr;
    memcpy((void *)&pkt->sockaddr, (void *)to, sizeof(struct sockaddr));
 
    if((u32)dataptr & 0x3f)
    {
        miss = 64 - ((u32)dataptr & 0x3f);
        if(miss > size) miss = size;
 
    } else {
 
        miss = 0;
    }
 
    pkt->malign = miss;
 
    if( !IS_UNCACHED_SEG(dataptr))
        sceSifWriteBackDCache((void *)dataptr, size);
 
    memcpy((void *)pkt->malign_buff, UNCACHED_SEG(dataptr), miss);
 
    if (sceSifCallRpc(&_ps2ip, PS2IPS_ID_SENDTO, 0, (void*)pkt, sizeof(send_pkt),
                (void*)&_rpc_buffer.result, sizeof(s32), NULL, NULL) < 0)
    {
        SignalSema(lock_sema);
        return -1;
    }
 
    result = _rpc_buffer.result;
 
    SignalSema(lock_sema);
 
    return result;
}
 
int ps2ipc_socket(int domain, int type, int protocol)
{
    int result;
    socket_pkt *pkt = &_rpc_buffer.socket_pkt;
 
    if(!_ps2ip.server) return -1;
 
    WaitSema(lock_sema);
 
    pkt->domain = domain;
    pkt->type = type;
    pkt->protocol = protocol;
 
    if (sceSifCallRpc(&_ps2ip, PS2IPS_ID_SOCKET, 0, (void*)pkt, sizeof(socket_pkt), (void*)&_rpc_buffer.result, sizeof(s32), NULL, NULL) < 0)
    {
        SignalSema(lock_sema);
        return -1;
    }
 
    result = _rpc_buffer.result;
 
    SignalSema(lock_sema);
 
    return result;
}
 
int ps2ipc_ps2ip_setconfig(const t_ip_info *ip_info)
{
    int result;
 
    if(!_ps2ip.server) return -1;
 
    WaitSema(lock_sema);
 
    // return config
    memcpy(&_rpc_buffer.ip_info, ip_info, sizeof(t_ip_info));
 
    if (sceSifCallRpc(&_ps2ip, PS2IPS_ID_SETCONFIG, 0, (void*)&_rpc_buffer.ip_info, sizeof(t_ip_info), (void*)&_rpc_buffer.result, sizeof(s32), NULL, NULL) < 0)
    {
        SignalSema(lock_sema);
        return -1;
    }
 
    result = _rpc_buffer.result;
 
    SignalSema(lock_sema);
 
    return result;
}
 
int ps2ipc_ps2ip_getconfig(char *netif_name, t_ip_info *ip_info)
{
    if(!_ps2ip.server) return -1;
 
    WaitSema(lock_sema);
 
    // call with netif name
    strncpy(_rpc_buffer.netif_name, netif_name, sizeof(_rpc_buffer.netif_name));
    _rpc_buffer.netif_name[sizeof(_rpc_buffer.netif_name) - 1] = '\0';
 
    if (sceSifCallRpc(&_ps2ip, PS2IPS_ID_GETCONFIG, 0, (void*)_rpc_buffer.netif_name, sizeof(_rpc_buffer.netif_name), (void*)&_rpc_buffer.ip_info, sizeof(t_ip_info), NULL, NULL) < 0)
    {
        SignalSema(lock_sema);
        return -1;
    }
 
    // return config
    memcpy(ip_info, &_rpc_buffer.ip_info, sizeof(t_ip_info));
 
    SignalSema(lock_sema);
 
    return 1;
}
 
/* Marshal between the caller's struct fd_set (newlib, ~128 bytes on EE)
 * and the on-the-wire ps2ip_rpc_fd_set (MEMP_NUM_NETCONN/8 bytes, fixed
 * size on both sides). Bit-by-bit copy avoids any reliance on
 * sizeof(struct fd_set) matching across the RPC boundary. */
static void ps2ipc_pack_fdset(ps2ip_rpc_fd_set *dst, struct fd_set *src, int maxfdp1)
{
    int i;
    memset(dst, 0, sizeof(*dst));
    if (src == NULL) return;
    if (maxfdp1 > (int)(sizeof(dst->fd_bits) * 8))
        maxfdp1 = (int)(sizeof(dst->fd_bits) * 8);
    for (i = 0; i < maxfdp1; i++) {
        if (FD_ISSET(i, src)) {
            dst->fd_bits[i >> 3] |= (unsigned char)(1U << (i & 7));
        }
    }
}
 
static void ps2ipc_unpack_fdset(struct fd_set *dst, const ps2ip_rpc_fd_set *src, int maxfdp1)
{
    int i;
    if (dst == NULL) return;
    FD_ZERO(dst);
    if (maxfdp1 > (int)(sizeof(src->fd_bits) * 8))
        maxfdp1 = (int)(sizeof(src->fd_bits) * 8);
    for (i = 0; i < maxfdp1; i++) {
        if (src->fd_bits[i >> 3] & (1U << (i & 7))) {
            FD_SET(i, dst);
        }
    }
}
 
int ps2ipc_select(int maxfdp1, struct fd_set *readset, struct fd_set *writeset, struct fd_set *exceptset, struct timeval *timeout)
{
    int result;
    select_pkt *pkt = &_rpc_buffer.select_pkt;
 
    if(!_ps2ip.server) return -1;
 
    WaitSema(lock_sema);
 
    pkt->maxfdp1 = maxfdp1;
    pkt->readset_p = (void *)readset;
    pkt->writeset_p = (void *)writeset;
    pkt->exceptset_p = (void *)exceptset;
    pkt->timeout_p = timeout;
    if( timeout )
    {
        pkt->timeout_sec  = (s32)timeout->tv_sec;
        pkt->timeout_usec = (s32)timeout->tv_usec;
    }
 
    ps2ipc_pack_fdset(&pkt->readset,   readset,   maxfdp1);
    ps2ipc_pack_fdset(&pkt->writeset,  writeset,  maxfdp1);
    ps2ipc_pack_fdset(&pkt->exceptset, exceptset, maxfdp1);
 
    if (sceSifCallRpc(&_ps2ip, PS2IPS_ID_SELECT, 0, (void*)pkt, sizeof(select_pkt), (void*)pkt, sizeof(select_pkt), NULL, NULL) < 0)
    {
        SignalSema(lock_sema);
        return -1;
    }
 
    if( timeout )
    {
        timeout->tv_sec  = pkt->timeout_sec;
        timeout->tv_usec = pkt->timeout_usec;
    }
 
    ps2ipc_unpack_fdset(readset,   &pkt->readset,   maxfdp1);
    ps2ipc_unpack_fdset(writeset,  &pkt->writeset,  maxfdp1);
    ps2ipc_unpack_fdset(exceptset, &pkt->exceptset, maxfdp1);
 
    result = pkt->result;
 
    SignalSema(lock_sema);
 
    return result;
}
 
int ps2ipc_ioctl(int s, long cmd, void *argp)
{
    int result;
    ioctl_pkt *pkt = &_rpc_buffer.ioctl_pkt;
 
    if(!_ps2ip.server) return -1;
 
    WaitSema(lock_sema);
 
    pkt->s = s;
    pkt->cmd = (s32)cmd;
    pkt->argp = argp;
    if( argp )
        pkt->value = *(s32*)argp;
 
    if (sceSifCallRpc(&_ps2ip, PS2IPS_ID_IOCTL, 0, (void*)pkt, sizeof(ioctl_pkt), (void*)pkt, sizeof(ioctl_pkt), NULL, NULL) < 0)
    {
        SignalSema(lock_sema);
        return -1;
    }
 
    if( argp )
        *(s32*)argp = pkt->value;
 
    result = pkt->result;
 
    SignalSema(lock_sema);
 
    return result;
}
 
int ps2ipc_getsockname(int s, struct sockaddr *name, int *namelen)
{
    int result;
    cmd_pkt *pkt = &_rpc_buffer.cmd_pkt;
 
    if(!_ps2ip.server) return -1;
 
    WaitSema(lock_sema);
 
    pkt->socket = s;
 
    if (sceSifCallRpc(&_ps2ip, PS2IPS_ID_GETSOCKNAME, 0, (void*)pkt, sizeof(pkt->socket), (void*)pkt, sizeof(cmd_pkt), NULL, NULL) < 0)
    {
        SignalSema(lock_sema);
        return -1;
    }
 
    if(pkt->len < *namelen) *namelen = pkt->len;
    memcpy((void *)name, (void *)&pkt->sockaddr, *namelen);
 
    result = pkt->socket;
 
    SignalSema(lock_sema);
 
    return result;
}
 
int ps2ipc_getpeername(int s, struct sockaddr *name, int *namelen)
{
    int result;
    cmd_pkt *pkt = &_rpc_buffer.cmd_pkt;
 
    if(!_ps2ip.server) return -1;
 
    WaitSema(lock_sema);
 
    pkt->socket = s;
 
    if (sceSifCallRpc(&_ps2ip, PS2IPS_ID_GETPEERNAME, 0, (void*)pkt, sizeof(pkt->socket), (void*)pkt, sizeof(cmd_pkt), NULL, NULL) < 0)
    {
        SignalSema(lock_sema);
        return -1;
    }
 
    if(pkt->len < *namelen) *namelen = pkt->len;
    memcpy((void *)name, (void *)&pkt->sockaddr, *namelen);
 
    result = pkt->socket;
 
    SignalSema(lock_sema);
 
    return result;
}
 
int ps2ipc_getsockopt(int s, int level, int optname, void* optval, socklen_t* optlen)
{
    getsockopt_pkt *pkt = &_rpc_buffer.getsockopt_pkt;
    getsockopt_res_pkt *res_pkt = &_rpc_buffer.getsockopt_res_pkt;
    int result;
 
    if(!_ps2ip.server) return -1;
 
    WaitSema(lock_sema);
 
    pkt->s = s;
    pkt->level = level;
    pkt->optname = optname;
 
    if (sceSifCallRpc(&_ps2ip, PS2IPS_ID_GETSOCKOPT, 0, (void*)pkt, sizeof(getsockopt_pkt), (void*)res_pkt, sizeof(getsockopt_res_pkt), NULL, NULL) < 0)
    {
        SignalSema(lock_sema);
        return -1;
    }
 
    if(res_pkt->optlen < *optlen) *optlen = res_pkt->optlen;
    memcpy((void*)optval, res_pkt->buffer, *optlen);
 
    result = res_pkt->result;
 
    SignalSema(lock_sema);
 
    return result;
}
 
int ps2ipc_setsockopt(int s, int level, int optname, const void *optval, socklen_t optlen)
{
    setsockopt_pkt *pkt = &_rpc_buffer.setsockopt_pkt;
    int result;
 
    if(!_ps2ip.server) return -1;
 
    WaitSema(lock_sema);
 
    pkt->s = s;
    pkt->level = level;
    pkt->optname = optname;
    pkt->optlen = optlen;
 
    memcpy(pkt->buffer, optval, optlen);
 
    if (sceSifCallRpc(&_ps2ip, PS2IPS_ID_SETSOCKOPT, 0, (void*)pkt, sizeof(setsockopt_pkt), (void*)&_rpc_buffer.result, sizeof(s32), NULL, NULL) < 0)
    {
        SignalSema(lock_sema);
        return -1;
    }
 
    result = _rpc_buffer.result;
 
    SignalSema(lock_sema);
 
    return result;
}
 
#ifdef PS2IP_DNS
struct hostent *ps2ipc_gethostbyname(const char *name)
{
    gethostbyname_res_pkt *res_pkt = &_rpc_buffer.gethostbyname_res_pkt;
    struct hostent *result;
    static ip_addr_t addr;
    static ip_addr_t *addr_list[2];
    static struct hostent hostent;
 
    if(!_ps2ip.server) return NULL;
 
    WaitSema(lock_sema);
 
    result = NULL;
    strncpy(_rpc_buffer.hostname, name, sizeof(_rpc_buffer.hostname));
    _rpc_buffer.hostname[sizeof(_rpc_buffer.hostname) - 1] = '\0';
    if(sceSifCallRpc(&_ps2ip, PS2IPS_ID_GETHOSTBYNAME, 0, (void*)_rpc_buffer.hostname, sizeof(_rpc_buffer.hostname), (void*)res_pkt, sizeof(gethostbyname_res_pkt), NULL, NULL) >=0)
    {
        if(res_pkt->result == 0)
        {
            hostent.h_addrtype = res_pkt->hostent.h_addrtype;
            hostent.h_length = res_pkt->hostent.h_length;
            hostent.h_name = (char*)name;
            hostent.h_aliases = NULL;
            memcpy(&addr, &res_pkt->hostent.h_addr, sizeof(addr));
            addr_list[0] = &addr;
            addr_list[1] = NULL;
            hostent.h_addr_list = (char**)&addr_list;
            result = &hostent;
        }
    }
 
    SignalSema(lock_sema);
 
    return result;
}
 
void ps2ipc_dns_setserver(u8 numdns, const ip_addr_t *dnsserver)
{
    dns_setserver_pkt *pkt = &_rpc_buffer.dns_setserver_pkt;
 
    if(!_ps2ip.server) return;
 
    WaitSema(lock_sema);
 
    pkt->numdns = numdns;
    pkt->dnsserver = (dnsserver != NULL) ? (*dnsserver) : *IP4_ADDR_ANY;
 
    sceSifCallRpc(&_ps2ip, PS2IPS_ID_DNS_SETSERVER, 0, (void*)pkt, sizeof(dns_setserver_pkt), NULL, 0, NULL, NULL);
 
    if (numdns < DNS_MAX_SERVERS)
        dns_servers[numdns] = (dnsserver != NULL) ? (*dnsserver) : *IP4_ADDR_ANY;
 
    SignalSema(lock_sema);
}
 
const ip_addr_t *ps2ipc_dns_getserver(u8 numdns)
{
    dns_getserver_res_pkt *res_pkt = &_rpc_buffer.dns_getserver_res_pkt;
    ip_addr_t *dns;
 
    if ((!_ps2ip.server) || (numdns >= DNS_MAX_SERVERS))
        return IP4_ADDR_ANY;
 
    WaitSema(lock_sema);
 
    _rpc_buffer.numdns = numdns;
    dns = &dns_servers[numdns];
 
    //If this fails, use the cached copy.
    if(sceSifCallRpc(&_ps2ip, PS2IPS_ID_DNS_GETSERVER, 0, (void*)&_rpc_buffer.numdns, sizeof(u8), (void*)res_pkt, sizeof(dns_getserver_res_pkt), NULL, NULL) >=0)
        ip_addr_copy(*dns, res_pkt->dnsserver);
 
    SignalSema(lock_sema);
 
    return dns;
}
#endif