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/* vim:ts=8:sts=8:sw=4:noai:noexpandtab
*
* PGM engine.
*
* Copyright (c) 2006-2010 Miru Limited.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _WIN32
# include <netdb.h>
#endif
#include <impl/i18n.h>
#include <impl/framework.h>
#include <impl/engine.h>
#include <impl/mem.h>
#include <impl/socket.h>
#include <pgm/engine.h>
#include <pgm/version.h>
//#define ENGINE_DEBUG
/* globals */
int pgm_ipproto_pgm PGM_GNUC_READ_MOSTLY = IPPROTO_PGM;
#ifdef _WIN32
LPFN_WSARECVMSG pgm_WSARecvMsg PGM_GNUC_READ_MOSTLY = NULL;
#endif
#ifdef PGM_DEBUG
unsigned pgm_loss_rate PGM_GNUC_READ_MOSTLY = 0;
#endif
/* locals */
static bool pgm_is_supported = FALSE;
static volatile uint32_t pgm_ref_count = 0;
#ifdef _WIN32
# ifndef WSAID_WSARECVMSG
/* http://cvs.winehq.org/cvsweb/wine/include/mswsock.h */
# define WSAID_WSARECVMSG {0xf689d7c8,0x6f1f,0x436b,{0x8a,0x53,0xe5,0x4f,0xe3,0x51,0xc3,0x22}}
# endif
#endif
/* startup PGM engine, mainly finding PGM protocol definition, if any from NSS
*
* returns TRUE on success, returns FALSE if an error occurred, implying some form of
* system re-configuration is required to resolve before trying again.
*
* NB: Valgrind loves generating errors in getprotobyname().
*/
bool
pgm_init (
pgm_error_t** error
)
{
if (pgm_atomic_exchange_and_add32 (&pgm_ref_count, 1) > 0)
return TRUE;
/* initialise dependent modules */
pgm_messages_init();
pgm_minor ("OpenPGM %d.%d.%d%s%s%s %s %s %s %s",
pgm_major_version, pgm_minor_version, pgm_micro_version,
pgm_build_revision ? " (" : "", pgm_build_revision ? pgm_build_revision : "", pgm_build_revision ? ")" : "",
pgm_build_date, pgm_build_time, pgm_build_system, pgm_build_machine);
pgm_thread_init();
pgm_mem_init();
pgm_rand_init();
#ifdef _WIN32
WORD wVersionRequested = MAKEWORD (2, 2);
WSADATA wsaData;
if (WSAStartup (wVersionRequested, &wsaData) != 0)
{
const int save_errno = WSAGetLastError ();
pgm_set_error (error,
PGM_ERROR_DOMAIN_ENGINE,
pgm_error_from_wsa_errno (save_errno),
_("WSAStartup failure: %s"),
pgm_wsastrerror (save_errno));
goto err_shutdown;
}
if (LOBYTE (wsaData.wVersion) != 2 || HIBYTE (wsaData.wVersion) != 2)
{
WSACleanup();
pgm_set_error (error,
PGM_ERROR_DOMAIN_ENGINE,
PGM_ERROR_FAILED,
_("WSAStartup failed to provide requested version 2.2."));
goto err_shutdown;
}
# ifndef CONFIG_TARGET_WINE
/* find WSARecvMsg API */
if (NULL == pgm_WSARecvMsg) {
GUID WSARecvMsg_GUID = WSAID_WSARECVMSG;
DWORD cbBytesReturned;
const SOCKET sock = socket (AF_INET, SOCK_DGRAM, 0);
if (SOCKET_ERROR == sock) {
WSACleanup();
pgm_set_error (error,
PGM_ERROR_DOMAIN_ENGINE,
PGM_ERROR_FAILED,
_("Cannot open socket."));
goto err_shutdown;
}
if (SOCKET_ERROR == WSAIoctl (sock,
SIO_GET_EXTENSION_FUNCTION_POINTER,
&WSARecvMsg_GUID, sizeof(WSARecvMsg_GUID),
&pgm_WSARecvMsg, sizeof(pgm_WSARecvMsg),
&cbBytesReturned,
NULL,
NULL))
{
closesocket (sock);
WSACleanup();
pgm_set_error (error,
PGM_ERROR_DOMAIN_ENGINE,
PGM_ERROR_FAILED,
_("WSARecvMsg function not found."));
goto err_shutdown;
}
pgm_debug ("Retrieved address of WSARecvMsg.");
closesocket (sock);
}
# endif
#endif /* _WIN32 */
/* find PGM protocol id overriding default value, use first value from NIS */
#ifdef CONFIG_HAVE_GETPROTOBYNAME_R
char b[1024];
struct protoent protobuf;
const struct protoent* proto = getprotobyname_r ("pgm", &protobuf, b, sizeof(b));
if (NULL != proto) {
if (proto->p_proto != pgm_ipproto_pgm) {
pgm_minor (_("Setting PGM protocol number to %i from /etc/protocols."),
proto->p_proto);
pgm_ipproto_pgm = proto->p_proto;
}
}
#elif defined(CONFIG_HAVE_GETPROTOBYNAME_R2)
char b[1024];
struct protoent protobuf, *proto;
const int e = getprotobyname_r ("pgm", &protobuf, b, sizeof(b), &proto);
if (e != -1 && proto != NULL) {
if (proto->p_proto != pgm_ipproto_pgm) {
pgm_minor (_("Setting PGM protocol number to %i from /etc/protocols."),
proto->p_proto);
pgm_ipproto_pgm = proto->p_proto;
}
}
#else
const struct protoent *proto = getprotobyname ("pgm");
if (proto != NULL) {
if (proto->p_proto != pgm_ipproto_pgm) {
#ifndef _WIN32
pgm_minor (_("Setting PGM protocol number to %i from /etc/protocols."),
proto->p_proto);
#else
pgm_minor (_("Setting PGM protocol number to %i from %%SYSTEMROOT%%\\system32\\drivers\\etc\\protocols."),
proto->p_proto);
#endif
pgm_ipproto_pgm = proto->p_proto;
}
}
#endif
/* ensure timing enabled */
pgm_error_t* sub_error = NULL;
if (!pgm_time_init (&sub_error)) {
if (sub_error)
pgm_propagate_error (error, sub_error);
#ifdef _WIN32
WSACleanup();
#endif
goto err_shutdown;
}
/* receiver simulated loss rate */
#ifdef PGM_DEBUG
const char *loss_rate = getenv ("PGM_LOSS_RATE");
if (NULL != loss_rate) {
int value = atoi (loss_rate);
if (value > 0 && value <= 100) {
pgm_loss_rate = value;
pgm_minor (_("Setting PGM packet loss rate to %i%%."), pgm_loss_rate);
}
}
#endif
/* create global sock list lock */
pgm_rwlock_init (&pgm_sock_list_lock);
pgm_is_supported = TRUE;
return TRUE;
err_shutdown:
pgm_rand_shutdown();
pgm_mem_shutdown();
pgm_thread_shutdown();
pgm_messages_shutdown();
pgm_atomic_dec32 (&pgm_ref_count);
return FALSE;
}
/* returns TRUE if PGM engine has been initialized
*/
bool
pgm_supported (void)
{
return ( pgm_is_supported == TRUE );
}
/* returns TRUE on success, returns FALSE if an error occurred.
*/
bool
pgm_shutdown (void)
{
pgm_return_val_if_fail (pgm_atomic_read32 (&pgm_ref_count) > 0, FALSE);
if (pgm_atomic_exchange_and_add32 (&pgm_ref_count, (uint32_t)-1) != 1)
return TRUE;
pgm_is_supported = FALSE;
/* destroy all open socks */
while (pgm_sock_list) {
pgm_close ((pgm_sock_t*)pgm_sock_list->data, FALSE);
}
pgm_time_shutdown();
#ifdef _WIN32
WSACleanup();
#endif
pgm_rand_shutdown();
pgm_mem_shutdown();
pgm_thread_shutdown();
pgm_messages_shutdown();
return TRUE;
}
/* helper to drop out of setuid 0 after creating PGM sockets
*/
void
pgm_drop_superuser (void)
{
#ifndef _WIN32
if (0 == getuid()) {
setuid((gid_t)65534);
setgid((uid_t)65534);
}
#endif
}
/* eof */
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