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// Copyright 2005-2016 The Mumble Developers. All rights reserved.
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file at the root of the
// Mumble source tree or at <https://www.mumble.info/LICENSE>.
#include "../mumble_plugin.h"
#include <stdio.h>
#include <stdint.h>
#include <wchar.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/mman.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
static std::wstring wsPluginName(L"Link");
static std::wstring wsDescription;
static char memname[256];
struct LinkedMem {
uint32_t uiVersion;
uint32_t ui32count;
float fAvatarPosition[3];
float fAvatarFront[3];
float fAvatarTop[3];
wchar_t name[256];
float fCameraPosition[3];
float fCameraFront[3];
float fCameraTop[3];
wchar_t identity[256];
uint32_t context_len;
unsigned char context[256];
wchar_t description[2048];
};
/// Non-monotonic tick count in ms resolution
static int64_t GetTickCount() {
struct timeval tv;
gettimeofday(&tv,NULL);
return tv.tv_usec / 1000 + tv.tv_sec * 1000;
}
#define lm_invalid reinterpret_cast<struct LinkedMem *>(-1)
static struct LinkedMem *lm = lm_invalid;
static int shmfd = -1;
static int64_t last_tick = 0;
static uint32_t last_count = 0;
static void unlock() {
lm->ui32count = last_count = 0;
lm->uiVersion = 0;
lm->name[0] = 0;
wsPluginName.assign(L"Link");
wsDescription.clear();
}
static int trylock() {
if (lm == lm_invalid)
return false;
if ((lm->uiVersion == 1) || (lm->uiVersion == 2)) {
if (lm->ui32count != last_count) {
last_tick = GetTickCount();
last_count = lm->ui32count;
wchar_t buff[2048];
if (lm->name[0]) {
wcsncpy(buff, lm->name, 256);
buff[255] = 0;
wsPluginName.assign(buff);
}
if (lm->description[0]) {
wcsncpy(buff, lm->description, 2048);
buff[2047] = 0;
wsDescription.assign(buff);
}
return true;
}
}
return false;
}
static const std::wstring longdesc() {
return wsDescription;
}
static int fetch(float *avatar_pos, float *avatar_front, float *avatar_top,
float *camera_pos, float *camera_front, float *camera_top,
std::string &context, std::wstring &identity) {
if (lm->ui32count != last_count) {
last_tick = GetTickCount();
last_count = lm->ui32count;
} else if ((GetTickCount() - last_tick) > 5000)
return false;
if ((lm->uiVersion != 1) && (lm->uiVersion != 2))
return false;
for (int i=0;i<3;++i) {
avatar_pos[i]=lm->fAvatarPosition[i];
avatar_front[i]=lm->fAvatarFront[i];
avatar_top[i]=lm->fAvatarTop[i];
}
if (lm->uiVersion == 2) {
for (int i=0;i<3;++i) {
camera_pos[i]=lm->fCameraPosition[i];
camera_front[i]=lm->fCameraFront[i];
camera_top[i]=lm->fCameraTop[i];
}
if (lm->context_len > 255)
lm->context_len = 255;
lm->identity[255] = 0;
context.assign(reinterpret_cast<const char *>(lm->context), lm->context_len);
identity.assign(lm->identity);
} else {
for (int i=0;i<3;++i) {
camera_pos[i]=lm->fAvatarPosition[i];
camera_front[i]=lm->fAvatarFront[i];
camera_top[i]=lm->fAvatarTop[i];
}
context.clear();
identity.clear();
}
return true;
}
__attribute__((constructor))
static void load_plugin() {
bool bCreated = false;
snprintf(memname, 256, "/MumbleLink.%d", getuid());
shmfd = shm_open(memname, O_RDWR, S_IRUSR | S_IWUSR);
if (shmfd < 0) {
bCreated = true;
shmfd = shm_open(memname, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR);
}
if (shmfd < 0) {
fprintf(stderr,"Mumble Link plugin: error creating shared memory\n");
return;
}
if (bCreated) {
if (ftruncate(shmfd, sizeof(struct LinkedMem)) != 0) {
fprintf(stderr, "Mumble Link plugin: failed to resize shared memory\n");
close(shmfd);
shmfd = -1;
return;
}
}
lm = static_cast<struct LinkedMem*>(
mmap(NULL, sizeof(struct LinkedMem), PROT_READ | PROT_WRITE, MAP_SHARED, shmfd,0));
if ((lm != lm_invalid) && bCreated)
memset(lm, 0, sizeof(struct LinkedMem));
}
__attribute__((destructor))
static void unload_plugin() {
if (lm != lm_invalid)
munmap(lm, sizeof(struct LinkedMem));
if (shmfd > -1)
close(shmfd);
shm_unlink(memname);
}
static std::wstring description(L"Link v1.2.0");
static MumblePlugin linkplug = {
MUMBLE_PLUGIN_MAGIC,
description,
wsPluginName,
NULL,
NULL,
trylock,
unlock,
longdesc,
fetch
};
extern "C" MUMBLE_PLUGIN_EXPORT MumblePlugin *getMumblePlugin() {
return &linkplug;
}
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