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vdr/plugin.c

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/*
* plugin.c: The VDR plugin interface
*
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: plugin.c 4.2 2020/06/29 09:29:06 kls Exp $
*/
#include "plugin.h"
#include <ctype.h>
#include <dirent.h>
#include <dlfcn.h>
#include <stdlib.h>
#include <time.h>
#include "config.h"
#include "interface.h"
#include "thread.h"
#define LIBVDR_PREFIX "libvdr-"
#define SO_INDICATOR ".so."
#define MAXPLUGINARGS 1024
#define HOUSEKEEPINGDELTA 10 // seconds
// --- cPlugin ---------------------------------------------------------------
cString cPlugin::configDirectory;
cString cPlugin::cacheDirectory;
cString cPlugin::resourceDirectory;
cPlugin::cPlugin(void)
{
name = NULL;
started = false;
}
cPlugin::~cPlugin()
{
}
void cPlugin::SetName(const char *s)
{
name = s;
I18nRegister(name);
}
const char *cPlugin::CommandLineHelp(void)
{
return NULL;
}
bool cPlugin::ProcessArgs(int argc, char *argv[])
{
return true;
}
bool cPlugin::Initialize(void)
{
return true;
}
bool cPlugin::Start(void)
{
return true;
}
void cPlugin::Stop(void)
{
}
void cPlugin::Housekeeping(void)
{
}
void cPlugin::MainThreadHook(void)
{
}
cString cPlugin::Active(void)
{
return NULL;
}
time_t cPlugin::WakeupTime(void)
{
return 0;
}
const char *cPlugin::MainMenuEntry(void)
{
return NULL;
}
cOsdObject *cPlugin::MainMenuAction(void)
{
return NULL;
}
cMenuSetupPage *cPlugin::SetupMenu(void)
{
return NULL;
}
bool cPlugin::SetupParse(const char *Name, const char *Value)
{
return false;
}
void cPlugin::SetupStore(const char *Name, const char *Value)
{
Setup.Store(Name, Value, this->Name());
}
void cPlugin::SetupStore(const char *Name, int Value)
{
Setup.Store(Name, Value, this->Name());
}
bool cPlugin::Service(const char *Id, void *Data)
{
return false;
}
const char **cPlugin::SVDRPHelpPages(void)
{
return NULL;
}
cString cPlugin::SVDRPCommand(const char *Command, const char *Option, int &ReplyCode)
{
return NULL;
}
void cPlugin::SetConfigDirectory(const char *Dir)
{
configDirectory = Dir;
}
const char *cPlugin::ConfigDirectory(const char *PluginName)
{
static cString buffer;
if (!cThread::IsMainThread())
esyslog("ERROR: plugin '%s' called cPlugin::ConfigDirectory(), which is not thread safe!", PluginName ? PluginName : "<no name given>");
buffer = cString::sprintf("%s/plugins%s%s", *configDirectory, PluginName ? "/" : "", PluginName ? PluginName : "");
return MakeDirs(buffer, true) ? *buffer : NULL;
}
void cPlugin::SetCacheDirectory(const char *Dir)
{
cacheDirectory = Dir;
}
const char *cPlugin::CacheDirectory(const char *PluginName)
{
static cString buffer;
if (!cThread::IsMainThread())
esyslog("ERROR: plugin '%s' called cPlugin::CacheDirectory(), which is not thread safe!", PluginName ? PluginName : "<no name given>");
buffer = cString::sprintf("%s/plugins%s%s", *cacheDirectory, PluginName ? "/" : "", PluginName ? PluginName : "");
return MakeDirs(buffer, true) ? *buffer : NULL;
}
void cPlugin::SetResourceDirectory(const char *Dir)
{
resourceDirectory = Dir;
}
const char *cPlugin::ResourceDirectory(const char *PluginName)
{
static cString buffer;
if (!cThread::IsMainThread())
esyslog("ERROR: plugin '%s' called cPlugin::ResourceDirectory(), which is not thread safe!", PluginName ? PluginName : "<no name given>");
buffer = cString::sprintf("%s/plugins%s%s", *resourceDirectory, PluginName ? "/" : "", PluginName ? PluginName : "");
return MakeDirs(buffer, true) ? *buffer : NULL;
}
// --- cDll ------------------------------------------------------------------
cDll::cDll(const char *FileName, const char *Args)
{
fileName = strdup(FileName);
args = Args ? strdup(Args) : NULL;
handle = NULL;
plugin = NULL;
destroy = NULL;
}
cDll::~cDll()
{
if (destroy)
destroy(plugin);
else
delete plugin; // silently fall back for plugins compiled with VDR version <= 2.4.3
if (handle)
dlclose(handle);
free(args);
free(fileName);
}
static char *SkipQuote(char *s)
{
char c = *s;
memmove(s, s + 1, strlen(s));
while (*s && *s != c) {
if (*s == '\\')
memmove(s, s + 1, strlen(s));
if (*s)
s++;
}
if (*s) {
memmove(s, s + 1, strlen(s));
return s;
}
esyslog("ERROR: missing closing %c", c);
fprintf(stderr, "vdr: missing closing %c\n", c);
return NULL;
}
bool cDll::Load(bool Log)
{
if (Log)
isyslog("loading plugin: %s", fileName);
if (handle) {
esyslog("attempt to load plugin '%s' twice!", fileName);
return false;
}
handle = dlopen(fileName, RTLD_NOW);
const char *error = dlerror();
if (!error) {
typedef cPlugin *create_t(void);
create_t *create = (create_t *)dlsym(handle, "VDRPluginCreator");
if (!(error = dlerror()))
plugin = create();
destroy = (destroy_t *)dlsym(handle, "VDRPluginDestroyer");
}
if (!error) {
if (plugin && args) {
int argc = 0;
char *argv[MAXPLUGINARGS];
char *p = skipspace(stripspace(args));
char *q = NULL;
bool done = false;
while (!done) {
if (!q)
q = p;
switch (*p) {
case '\\': memmove(p, p + 1, strlen(p));
if (*p)
p++;
else {
esyslog("ERROR: missing character after \\");
fprintf(stderr, "vdr: missing character after \\\n");
return false;
}
break;
case '"':
case '\'': if ((p = SkipQuote(p)) == NULL)
return false;
break;
default: if (!*p || isspace(*p)) {
done = !*p;
*p = 0;
if (q) {
if (argc < MAXPLUGINARGS - 1)
argv[argc++] = q;
else {
esyslog("ERROR: plugin argument list too long");
fprintf(stderr, "vdr: plugin argument list too long\n");
return false;
}
q = NULL;
}
}
if (!done)
p = *p ? p + 1 : skipspace(p + 1);
}
}
argv[argc] = NULL;
if (argc)
plugin->SetName(argv[0]);
optind = 0; // to reset the getopt() data
return !Log || !argc || plugin->ProcessArgs(argc, argv);
}
}
else {
esyslog("ERROR: %s", error);
fprintf(stderr, "vdr: %s\n", error);
}
return !error && plugin;
}
// --- cPluginManager --------------------------------------------------------
cPluginManager *cPluginManager::pluginManager = NULL;
cPluginManager::cPluginManager(const char *Directory)
{
directory = NULL;
lastHousekeeping = time(NULL);
nextHousekeeping = -1;
if (pluginManager) {
fprintf(stderr, "vdr: attempt to create more than one plugin manager - exiting!\n");
exit(2);
}
SetDirectory(Directory);
pluginManager = this;
}
cPluginManager::~cPluginManager()
{
Shutdown();
free(directory);
if (pluginManager == this)
pluginManager = NULL;
}
void cPluginManager::SetDirectory(const char *Directory)
{
free(directory);
directory = Directory ? strdup(Directory) : NULL;
}
void cPluginManager::AddPlugin(const char *Args)
{
if (strcmp(Args, "*") == 0) {
cFileNameList Files(directory);
for (int i = 0; i < Files.Size(); i++) {
char *FileName = Files.At(i);
if (strstr(FileName, LIBVDR_PREFIX) == FileName) {
char *p = strstr(FileName, SO_INDICATOR);
if (p) {
*p = 0;
p += strlen(SO_INDICATOR);
if (strcmp(p, APIVERSION) == 0) {
char *name = FileName + strlen(LIBVDR_PREFIX);
if (strcmp(name, "*") != 0) { // let's not get into a loop!
AddPlugin(FileName + strlen(LIBVDR_PREFIX));
}
}
}
}
}
return;
}
char *s = strdup(skipspace(Args));
char *p = strchr(s, ' ');
if (p)
*p = 0;
dlls.Add(new cDll(cString::sprintf("%s/%s%s%s%s", directory, LIBVDR_PREFIX, s, SO_INDICATOR, APIVERSION), Args));
free(s);
}
bool cPluginManager::LoadPlugins(bool Log)
{
for (cDll *dll = dlls.First(); dll; dll = dlls.Next(dll)) {
if (!dll->Load(Log))
return false;
}
return true;
}
bool cPluginManager::InitializePlugins(void)
{
for (cDll *dll = dlls.First(); dll; dll = dlls.Next(dll)) {
cPlugin *p = dll->Plugin();
if (p) {
isyslog("initializing plugin: %s (%s): %s", p->Name(), p->Version(), p->Description());
if (!p->Initialize())
return false;
}
}
return true;
}
bool cPluginManager::StartPlugins(void)
{
for (cDll *dll = dlls.First(); dll; dll = dlls.Next(dll)) {
cPlugin *p = dll->Plugin();
if (p) {
isyslog("starting plugin: %s", p->Name());
if (!p->Start())
return false;
p->started = true;
}
}
return true;
}
void cPluginManager::Housekeeping(void)
{
if (time(NULL) - lastHousekeeping > HOUSEKEEPINGDELTA) {
if (++nextHousekeeping >= dlls.Count())
nextHousekeeping = 0;
cDll *dll = dlls.Get(nextHousekeeping);
if (dll) {
cPlugin *p = dll->Plugin();
if (p) {
p->Housekeeping();
}
}
lastHousekeeping = time(NULL);
}
}
void cPluginManager::MainThreadHook(void)
{
for (cDll *dll = pluginManager->dlls.First(); dll; dll = pluginManager->dlls.Next(dll)) {
cPlugin *p = dll->Plugin();
if (p)
p->MainThreadHook();
}
}
bool cPluginManager::Active(const char *Prompt)
{
if (pluginManager) {
for (cDll *dll = pluginManager->dlls.First(); dll; dll = pluginManager->dlls.Next(dll)) {
cPlugin *p = dll->Plugin();
if (p) {
cString s = p->Active();
if (!isempty(*s)) {
if (!Prompt || !Interface->Confirm(cString::sprintf("%s - %s", *s, Prompt)))
return true;
}
}
}
}
return false;
}
cPlugin *cPluginManager::GetNextWakeupPlugin(void)
{
cPlugin *NextPlugin = NULL;
if (pluginManager) {
time_t Now = time(NULL);
time_t Next = 0;
for (cDll *dll = pluginManager->dlls.First(); dll; dll = pluginManager->dlls.Next(dll)) {
cPlugin *p = dll->Plugin();
if (p) {
time_t t = p->WakeupTime();
if (t > Now && (!Next || t < Next)) {
Next = t;
NextPlugin = p;
}
}
}
}
return NextPlugin;
}
bool cPluginManager::HasPlugins(void)
{
return pluginManager && pluginManager->dlls.Count();
}
cPlugin *cPluginManager::GetPlugin(int Index)
{
cDll *dll = pluginManager ? pluginManager->dlls.Get(Index) : NULL;
return dll ? dll->Plugin() : NULL;
}
cPlugin *cPluginManager::GetPlugin(const char *Name)
{
if (pluginManager && Name) {
for (cDll *dll = pluginManager->dlls.First(); dll; dll = pluginManager->dlls.Next(dll)) {
cPlugin *p = dll->Plugin();
if (p && strcmp(p->Name(), Name) == 0)
return p;
}
}
return NULL;
}
cPlugin *cPluginManager::CallFirstService(const char *Id, void *Data)
{
if (pluginManager) {
for (cDll *dll = pluginManager->dlls.First(); dll; dll = pluginManager->dlls.Next(dll)) {
cPlugin *p = dll->Plugin();
if (p && p->Service(Id, Data))
return p;
}
}
return NULL;
}
bool cPluginManager::CallAllServices(const char *Id, void *Data)
{
bool found=false;
if (pluginManager) {
for (cDll *dll = pluginManager->dlls.First(); dll; dll = pluginManager->dlls.Next(dll)) {
cPlugin *p = dll->Plugin();
if (p && p->Service(Id, Data))
found = true;
}
}
return found;
}
void cPluginManager::StopPlugins(void)
{
for (cDll *dll = dlls.Last(); dll; dll = dlls.Prev(dll)) {
cPlugin *p = dll->Plugin();
if (p && p->started) {
isyslog("stopping plugin: %s", p->Name());
p->Stop();
p->started = false;
}
}
}
void cPluginManager::Shutdown(bool Log)
{
cDll *dll;
while ((dll = dlls.Last()) != NULL) {
cPlugin *p = dll->Plugin();
if (p && Log)
isyslog("deleting plugin: %s", p->Name());
dlls.Del(dll);
}
}
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