reader.c


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#include <stdio.h>
#include <limits.h>
#include <dlfcn.h>

#include "nfcommander.h"
#include "reader.h"
#include "config.h"

#define MAX_PLUGIN_PATH NAME_MAX
void* reader_module = NULL;
reader_plugin_handle reader_backend_handle = NULL;

int reader_init(){
	char plugin[MAX_PLUGIN_PATH] = "";
	char* reader = config_get("nfc", "reader");

	if(!reader){
		printf("No reader plugin configured\n");
		return -1;
	}

	snprintf(plugin, sizeof(plugin), "./reader_%s.so", reader);
	reader_module = dlopen(plugin, RTLD_NOW);

	if(!reader_module){
		printf("Failed to load reader plugin %s: %s\n", plugin, dlerror());
		return -1;
	}

	reader_backend_handle = dlsym(reader_module, "handle");

	//call initializer
	reader_plugin_init init = dlsym(reader_module, "init");
	if(!reader_backend_handle || !init || init()){
		printf("Failed to initialize the reader\n");
		return 1;
	}

	return 0;
}

int reader_handle(int fd){
	return reader_backend_handle(fd);
}

void reader_free(){
	if(reader_module){
		dlclose(reader_module);
		reader_backend_handle = NULL;
		reader_module = NULL;
	}
}