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vdr/plugin.c

320 lines
7.6 KiB
C
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2002-05-09 16:26:56 +02:00
/*
* 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 1.1 2002/05/09 16:26:56 kls Exp $
*/
#include "plugin.h"
#include <ctype.h>
#include <dirent.h>
#include <dlfcn.h>
#include "config.h"
#define LIBVDR_PREFIX "libvdr-"
#define SO_INDICATOR ".so."
#define MAXPLUGINARGS 1024
// --- cPlugin ---------------------------------------------------------------
cPlugin::cPlugin(void)
{
name = NULL;
}
cPlugin::~cPlugin()
{
I18nRegister(NULL, Name());
}
void cPlugin::SetName(const char *s)
{
name = s;
}
const char *cPlugin::CommandLineHelp(void)
{
return NULL;
}
bool cPlugin::ProcessArgs(int argc, char *argv[])
{
return true;
}
void cPlugin::Start(void)
{
}
const char *cPlugin::MainMenuEntry(void)
{
return NULL;
}
cOsdMenu *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());
}
void cPlugin::RegisterI18n(const tI18nPhrase * const Phrases)
{
I18nRegister(Phrases, Name());
}
// --- cDll ------------------------------------------------------------------
cDll::cDll(const char *FileName, const char *Args)
{
fileName = strdup(FileName);
args = Args ? strdup(Args) : NULL;
handle = NULL;
plugin = NULL;
}
cDll::~cDll()
{
delete plugin;
if (handle)
dlclose(handle);
delete args;
delete fileName;
}
static char *SkipQuote(char *s)
{
char c = *s;
strcpy(s, s + 1);
while (*s && *s != c) {
if (*s == '\\')
strcpy(s, s + 1);
if (*s)
s++;
}
if (*s) {
strcpy(s, s + 1);
return s;
}
esyslog(LOG_ERR, "ERROR: missing closing %c", c);
fprintf(stderr, "vdr: missing closing %c\n", c);
return NULL;
}
bool cDll::Load(bool Log)
{
if (Log)
isyslog(LOG_INFO, "loading plugin: %s", fileName);
if (handle) {
esyslog(LOG_ERR, "attempt to load plugin '%s' twice!", fileName);
return false;
}
handle = dlopen(fileName, RTLD_NOW);
const char *error = dlerror();
if (!error) {
void *(*creator)(void);
(void *)creator = dlsym(handle, "VDRPluginCreator");
if (!(error = dlerror()))
plugin = (cPlugin *)creator();
}
if (!error) {
if (plugin && args) {
int argc = 0;
char *argv[MAXPLUGINARGS];
char *p = args;
char *q = NULL;
bool done = false;
while (!done) {
if (!q)
q = p;
switch (*p) {
case '\\': strcpy(p, p + 1);
if (*p)
p++;
else {
esyslog(LOG_ERR, "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(LOG_ERR, "ERROR: plugin argument list too long");
fprintf(stderr, "vdr: plugin argument list too long\n");
return false;
}
q = NULL;
}
}
if (!done)
p++;
}
}
argv[argc] = NULL;
if (argc)
plugin->SetName(argv[0]);
optind = 0; // to reset the getopt() data
return !argc || plugin->ProcessArgs(argc, argv);
}
}
else {
esyslog(LOG_ERR, "ERROR: %s", error);
fprintf(stderr, "vdr: %s\n", error);
}
return !error && plugin;
}
// --- cPluginManager --------------------------------------------------------
cPluginManager *cPluginManager::pluginManager = NULL;
cPluginManager::cPluginManager(const char *Directory)
{
directory = NULL;
if (pluginManager) {
fprintf(stderr, "vdr: attempt to create more than one plugin manager - exiting!\n");
exit(2);
}
SetDirectory(Directory);
pluginManager = this;
}
cPluginManager::~cPluginManager()
{
Shutdown();
delete directory;
if (pluginManager == this)
pluginManager = NULL;
}
void cPluginManager::SetDirectory(const char *Directory)
{
delete directory;
directory = Directory ? strdup(Directory) : NULL;
}
void cPluginManager::AddPlugin(const char *Args)
{
if (strcmp(Args, "*") == 0) {
DIR *d = opendir(directory);
if (d) {
struct dirent *e;
while ((e = readdir(d)) != NULL) {
if (strstr(e->d_name, LIBVDR_PREFIX) == e->d_name) {
char *p = strstr(e->d_name, SO_INDICATOR);
if (p) {
*p = 0;
p += strlen(SO_INDICATOR);
if (strcmp(p, VDRVERSION) == 0) {
char *name = e->d_name + strlen(LIBVDR_PREFIX);
if (strcmp(name, "*") != 0) { // let's not get into a loop!
AddPlugin(e->d_name + strlen(LIBVDR_PREFIX));
}
}
}
}
}
closedir(d);
}
return;
}
char *s = strdup(Args);
char *p = strchr(s, ' ');
if (p)
*p = 0;
char *buffer = NULL;
asprintf(&buffer, "%s/%s%s%s%s", directory, LIBVDR_PREFIX, s, SO_INDICATOR, VDRVERSION);
dlls.Add(new cDll(buffer, Args));
delete buffer;
delete s;
}
bool cPluginManager::LoadPlugins(bool Log)
{
for (cDll *dll = dlls.First(); dll; dll = dlls.Next(dll)) {
if (!dll->Load(Log))
return false;
}
return true;
}
void cPluginManager::StartPlugins(void)
{
for (cDll *dll = dlls.First(); dll; dll = dlls.Next(dll)) {
cPlugin *p = dll->Plugin();
if (p) {
int Language = Setup.OSDLanguage;
Setup.OSDLanguage = 0; // the i18n texts are only available _after_ Start()
isyslog(LOG_INFO, "starting plugin: %s (%s): %s", p->Name(), p->Version(), p->Description());
Setup.OSDLanguage = Language;
dll->Plugin()->Start();
}
}
}
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) {
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;
}
void cPluginManager::Shutdown(bool Log)
{
cDll *dll;
while ((dll = dlls.Last()) != NULL) {
if (Log) {
cPlugin *p = dll->Plugin();
if (p)
isyslog(LOG_INFO, "stopping plugin: %s", p->Name());
}
dlls.Del(dll);
}
}